Display device and driving method thereof

FIELD: physics.

SUBSTANCE: liquid-crystal display device recognises every 12 video signal lines (SL1-SLn) in the order of their arrangement as a group and drives the video signal lines with time division in the group in the horizontal scanning period. The order of driving video signal lines in the group for a frame with an even number differs from the order for a frame with an odd number. For each line, the video signal line with an even number is driven first in one frame, and the video signal line with an odd number is driven first in another. The first and last driven video signal lines are specified so that they correspond to blue colour. The number of push-ups, under the effect of which video signal lines fall, is limited to two for the frame with an even number and zero for the frame with an odd number in addition to change of their order, so that the arising of vertical strips at low temperatures is prevented. Additionally, only video signal lines corresponding to the blue colour are specified as having insufficient charge, so that viewers find it difficult to recognise deterioration of image quality due to insufficient charge.

EFFECT: prevention of arising of vertical strips in display devices which perform driving with time division of video signal lines.

13 cl, 9 dwg

 

The technical field to which the invention relates.

The present invention relates to a display device that performs color display by means of the excitation lines of the video signal in the mode of time division, and the way his excitement.

The level of technology

In the display devices in recent years continued to increase sharpness of displayed images. In display devices and active matrix (for example, liquid crystal display devices of active matrix) is the number of signal lines (signal lines of the scan lines of the video signal), which corresponds to a resolution of the displayed images provided on the display panel. Therefore, in the display devices of active matrix with increasing sharpness of displayed images, the number of signal lines that connect the exciting circuit to the signal lines on the display panel increases, and thus there is a need to place these signal lines with a narrow step. In particular, in the display device that performs color display, in General, the number of lines of the video signal is greater than the number of the signal lines of the scan, and thus there is a need to place the signal lines that connect the exciting circuit of lines of video signal lines videosin the La, with a narrower pitch.

In order to solve the above problem, traditionally known method (hereafter in this document referred to as the excitation time division lines of the video signal), in which the lines of the video signal are grouped everyalines of the video signal (ais an integer greater than or equal to two) in the stacking order, each group is allocated one output of the driving circuit lines of the video signal lines and video signal in each group are temporary separation during the horizontal scan period (for example, patent document 1). In display devices that perform the excitation time division lines of the video signal, the circuit line selection signal that switches what line of video signal must be applied to the voltage outputted from the driving circuit lines of the video signal, is provided between the driving circuit lines of the video signal and the line signal. Accordingly, the number of signal lines that connect the exciting circuit lines, video lines of the video signal can be reduced by 1/a.

However, in the display devices that perform the excitation time division lines of the video signal strip in the direction of the line video signal (hereinafter in this document called the vertical is significant bands) can occur on the display screen when the periodic repetition of lines of the video signal. Fig.7 is a diagram showing the parasitic capacitance that occurs between the lines of the video signal to the liquid crystal display device. As shown in Fig.7, two lines SLj and SLj+1 video have capacitive touch with each other through two parasitic capacitance Csd1 and Csd2. Thus, after the application of a certain voltage to the line SLj video signal voltage is applied to the line SLj+1 video related, the voltage in line SLj video falls under its scope and thereby varies (hereinafter in this document this phenomenon is referred to as "popping up").

The time line of the video signal falls under the effect of the push-up is the period when the line voltage signal related changes. When the lines of the video signal in the band always excited sequentially to the left line of the video signal is placed in the leftmost position in the group, falls under the effect of pushing up twice within one horizontal scan period, and the pixel circuits connected to the line video twice fall under the effect of pushing up. On the other hand, the line of the video signal is placed in the rightmost position in the group, does not fall under the effect of pushing up, and pixel circuits connected to the line video, also do not fall under the effect of vitalian what I'm up. In fact, the pixel circuits, which probably should be subject popping up, are aligned in the direction of the line of the video signal, and pixel circuits that do not fall under the effect of pushing up, and are combined in the direction of the line of the video signal, and thus the vertical stripes appear on the display screen. Vertical streaks appear noticeable when the screen is displayed a continuous halftone screen with uniform brightness.

In view of the foregoing, to prevent vertical bars in the display devices that perform the excitation time division lines of the video describes how the procedures excitation lines of the video signal in the group. For example, a method in which the order of the excitation lines of the video signal in the group reversed between an even frame and an odd frame (see figure 5, which is described below). According to the way all the lines of the video signal in the band fall under the effect of pushing up twice within one horizontal scan period in the even frame and the odd frame. By such adjustment of the number of times when the lines of the video signal fall under the effect of pushing up the vertical strip between the lines of the video signal can be prevented to some extent.

Furthermore, the patent shall document 2 discloses, the excitation lines of the video signal in the group is defined variables in order to prevent vertical bars in the display device, which performs the excitation time division lines of the video signal. This document discloses that the excitation of the four lines of the video signal Si-Si+3 way switches, shown in figa and 8B.

Patent document 1. Laid patent application (Japan) No. 6-138851

Patent document 2. Laid patent application (Japan) No. 2003-58133

The invention

Problems that must be solved by the invention

However, the way in which the order of the excitation lines of the video signal in the group reversed between an even frame and an odd frame, vertical stripes may appear on the display screen when operating conditions are unfavorable. For example, in a liquid crystal display device response speed of liquid crystal is reduced at low temperatures, and thus the vertical streaks are likely to occur. Therefore, in the liquid crystal display device, in which the order of the excitation lines of the video signal in the group reversed between an even frame and an odd frame, vertical stripes, which do not occur at ordinary temperature, can voznikat is at low temperatures.

In addition, in the display devices that perform the excitation time division lines of the video signal, insufficient charge, probably occurs in the first and last lines of the video signal, which must be raised in the group. Therefore, in the case of color display devices, if the order of the excitation lines of the video signal in the group is determined taking into account the fact that color display is performed, insufficient charge occurs in the lines of the video signal corresponding to the array of colors, degrading the image quality of the display screen. In patent document 2, when the order of the excitation lines of the video signal in the group is identified, the fact that color display is performed, is not taken into account.

Therefore, the aim of the present invention is to prevent vertical stripes and the deterioration of image quality due to insufficient charge in the display device that performs color display by means of the excitation lines of the video signal in a temporary separation.

The means of resolving problems

The first aspect of the present invention provides a display device that performs color display by means of the excitation lines of the video signal in a temporary separation, the display device includes the impact: the set of pixel circuits, placed next to the first and second direction, each of the alignment of the pixel circuits in the second direction corresponds to any of the colors used for color display; many of the signal lines of the scan, each of which connects together to pixel circuits aligned in the first direction; a lot of lines of video signals, each of which connects together to pixel circuits aligned in the second direction, and the lines of the video signal are grouped every predetermined number of lines of the video signal according to the order of placement; the exciting circuit of the signal lines sweep for line selection signal scan; stimulating the scheme of lines of the video signal for output to each group of lines of the video signal voltage that should be attached to the lines of the video signal in the group, in the mode of time division within one horizontal scan period; and a circuit line selection signal to select one line of the video signal from each group and providing a voltage output from the driving circuit lines of the video signal in the selected line of the video signal, respectively, the order of the excitation lines of the video signal in each group varies between an even frame and an odd frame, and for each line, in one of the frames, lines of the video signal with an even number in the group in bourdaud earlier what line of video signal with an odd number and one of the frames, lines of the video signal with an odd number in the group instituted before the line video signal with an even number, and the last line of the video signal, which must be raised in the group is a line of the video signal that corresponds to a specific color.

In accordance with the second aspect of the present invention in the first aspect of the present invention, in addition to the last line of the video signal, which must be raised in the group, the first line of the video signal, which must be raised in the group is a line of the video signal that corresponds to a specific color.

In accordance with a third aspect of the present invention in the first aspect of the present invention the order of the excitation lines of the video signal in the group reversed between an even frame and an odd frame.

In accordance with the fourth aspect of the present invention in the first aspect of the present invention the order of the excitation lines of the video signal in the group varies between even and odd lines.

In accordance with the fifth aspect of the present invention in the fourth aspect of the present invention the order of the excitation lines of the video signal in the group reversed between an even frame and an odd frame.

In accordance with the sixth aspect of the crust is asego of the invention in the fourth aspect of the present invention the result of the addition of a serial number of excitation for even lines in the even frame, the sequence number of excitation for odd lines in the even frame, the sequence number of the excitation of the odd lines in the odd frame and the sequence number of the excitation of the odd lines in the odd frame is the same for all lines of the video signal in the group.

In accordance with the seventh aspect of the present invention in the fourth aspect of the present invention the last line of the video signal, which must be raised in the group varies between the case of the even lines in the even frame, the case of odd lines in the even frame, the case of even-numbered lines in the odd frame and the case of odd lines in the odd frame.

In accordance with the eighth aspect of the present invention in the seventh aspect of the present invention in addition to the last line of the video signal, which must be raised in the group, the first line of the video signal, which must be raised in the group varies between the case of the even lines in the even frame, the case of odd lines in the even frame, the case of even-numbered lines in the odd frame and the case of odd lines in the odd frame.

In accordance with the ninth aspect of the present invention in the first aspect of the present invention the specific color is a color in which to observers the most difficult to recognize to change the brightness of the colors used for color display.

In the accordance with the tenth aspect of the present invention in a ninth aspect of the present invention, as the pixel circuits is provided a pixel circuit corresponding to red, green, and blue, and a specific color is blue.

In accordance with the eleventh aspect of the present invention in the first aspect of the present invention, the pixel circuits are provided a pixel circuit corresponding to red, green and blue lines of the video signal are grouped every 12 lines of the video signal, and each group includes lines R1-R4 of the video signal corresponding to the red, lines G1-G4 video signal corresponding to green, and the line B1-B4 of the video signal corresponding to blue, and the lines of the video signal are arranged in the order of R1, G1, B1, R2, G2, B2, R3, G3, B3, R4, G4 and B4, and 12 lines of the video signal in each group are excited in the order of B1, R1, G2, R3, B3, G4, G1, R2, B2, G3, R4 and B4 for even lines in the even frame and in the order B2, R2, G1, B4, R4, G3, G2, B1, R1, G4, R3 and B3 for odd lines in the even frame, and in reverse order for the even-numbered frame odd frame.

In accordance with the twelfth aspect of the present invention in the first aspect of the present invention, the pixel circuit includes the capacitance of the liquid crystal.

The thirteenth aspect of the present invention provides a method of excitation for a display device of the present invention, which includes multiple pixel circuits placed the poison in the first and second direction, each alignment of the pixel circuits in the second direction corresponds to any of the colors used for color display; many of the signal lines of the scan, each of which connects together to pixel circuits aligned in the first direction; and many lines of video signals, each of which connects together to pixel circuits aligned in the second direction, and the lines of the video signal are grouped every predetermined number of lines of the video signal according to the stacking order, the method of excitation includes the steps: selection of the signal lines of the sweep; o in each group of lines of the video signal voltage that must be applied to the lines of the video signal in the group, in the regime of temporary separation during the horizontal scan period; and selecting one line of the video signal from each group and providing voltages, each of which is the temporary separation of selected lines of the video signal, respectively, with the order of the excitation lines of the video signal in each group varies between an even frame and an odd frame, and for each line, in one of the frames, lines of the video signal with an even number in the group instituted before the line video signal with an odd number and one of the frame lines of the video signal with an odd number is om group excited before, what line of video signal with an even number, and the last line of the video signal, which must be raised in the group is a line of the video signal that corresponds to a specific color.

The advantage of the invention

According to the first or thirteenth aspect of the present invention in the frame, in which the lines of the video signal with an even number of excited earlier lines of the video signal with an even number fall under the effect of pushing up twice within one horizontal scan period, and in the frame in which the lines of the video signal with an odd number of excited earlier lines of the video signal with an odd number fall under the effect of pushing up twice within one period of the horizontal scan. By limiting thus the number of times when the lines of the video signal fall under the effect of pushing up two times for the even-numbered frame and zero for an odd frame, and zero time for the even-numbered frame and two for the odd frame, the occurrence of vertical stripes can be prevented, even when the operating conditions are unfavorable, for example, at low temperatures. In addition, by setting the last line of the video signal, which must be raised in each group to be the line of the video signal corresponding to a specific color, line, video, particularly where insufficient C is a number, probably, there are limited lines of the video signal corresponding to one color, providing an opportunity to prevent deterioration of image quality due to insufficient charge.

According to the second aspect of the present invention by setting the first and last lines of the video signal, which must be raised in each group to be the lines of the video signal corresponding to a specific color, line, video, where insufficient charge arises, limited lines of the video signal corresponding to one color, providing an opportunity to prevent deterioration of image quality due to insufficient charge.

According to a third aspect of the present invention by setting the order of the excitation lines of the video signal in each group, which should be reversed between an even frame and an odd frame, the effects popping up, taken through lines of the video signal becomes symmetric in the group relative to the first direction. Accordingly, the occurrence of vertical stripes can more effectively be prevented.

According to a fourth aspect of the present invention by switching the order of the excitation lines of the video signal in each group between odd and even lines, the impact on efficiency is that popping up taken through lines of the video signal are averaged between the lines, allowing you to more effectively prevent the occurrence of vertical stripes.

According to the fifth aspect of the present invention by setting the order of the excitation lines of the video signal in each group, which should be reversed between an even frame and an odd frame, and by switching the order of the excitation between the odd and even lines of the effect of popping up, taken through lines of the video signal becomes symmetric in the group relative to the first direction and thus are averaged between the lines. Accordingly, the occurrence of vertical stripes can more effectively be prevented.

According to the sixth aspect of the present invention by setting the arithmetic sequence numbers of the excitation lines of the video signal in each group is identical to the effect of pushing up, taken through lines of the video signal in the group are averaged, allowing you to more effectively prevent the occurrence of vertical stripes.

According to the seventh aspect of the present invention by switching the last line of the video signal, which must be raised in each group, on the other frame-by-frame basis, and line-by-line basis is e, line of the video signal, where the lack of charge occurs, switch to the other, allowing you to more effectively prevent the deterioration of image quality due to insufficient charge.

According to the eighth aspect of the present invention by switching the first and last lines of the video signal, which must be raised in each group, on the other on the frame-by-frame basis and a per-row basis, the lines of the video signal, where the lack of charge occurs, switch to the other, allowing you to more effectively prevent the deterioration of image quality due to insufficient charge.

According to the ninth aspect of the present invention, since the last line of the video signal, which must be raised in each group that corresponds to the color in which it is difficult for observers to detect a change in brightness, the lines of the video signal, in particular, where insufficient charge, probably arises, limited lines of the video signal corresponding to the color in which it is difficult for observers to detect a change in brightness. This can make it difficult for observers to recognize the deterioration of image quality due to insufficient charge.

According to the tenth aspect of the present invention the color in which to observers is the most difficult to recognize to change the brightness majdalany, green and blue is blue, and the last line of the video signal, which must be raised in each group corresponds to blue. Thus, the lines of the video signal, in particular, where insufficient charge, probably arises, limited lines of the video signal corresponding to the blue, where it is difficult for observers to detect a change in brightness. It may be difficult to recognize the deterioration of image quality by the observer due to insufficient charge in the display device that performs color display using RGB-scheme via the excitation lines of the video signal in a temporary separation.

According to the eleventh aspect of the present invention in a display device that performs color display using RGB-scheme by excitation in the mode of time-division lines of the video signal, which are grouped every 12 lines of the video signal can be prevented vertical stripes and the deterioration of image quality due to insufficient charge.

According to the twelfth aspect of the present invention in a liquid crystal display device that performs color display by means of the excitation lines of the video signal in a temporary separation may be prevented vertical stripes and the aggravation is their image quality due to insufficient charge.

Brief description of drawings

Figure 1 is a block diagram showing the configuration of a liquid crystal display device according to a variant implementation of the present invention.

Figure 2 is an equivalent schematic diagram of the pixel circuit of the liquid crystal display device shown in figure 1.

Figure 3 is a diagram showing the order of the excitation lines of the video signal in the group in the liquid crystal display device shown in figure 1.

Figure 4 is a timing diagram of the liquid crystal display device shown in figure 1.

Figure 5 is a diagram showing the order of the excitation lines of the video signal in the group in the liquid crystal display device according to the first comparative example.

6 is a diagram showing the order of the excitation lines of the video signal in the group in the liquid crystal display device according to the second comparative example.

Fig.7 is a diagram showing the parasitic capacitance that occurs between the lines of the video signal to the liquid crystal display device.

Figa is a diagram showing an example of switching the order of the excitation lines of the video signal in the group in a traditional liquid crystal display device.

FIGU is a diagram showing another example of the switch then the dka excitation lines of the video signal in the group in a traditional liquid crystal display device.

Room description links

1 - liquid crystal display device

2 - matrix pixels

3 - exciting circuit of the signal lines sweep

4 - exciting circuit lines video

5 and XR1-XR4, XG1-XG4 and XB1-XB4 - analog switch

6 is a diagram of the switch control

11 - TFT

12 - capacity liquid crystal

13 - pixel scheme Pij with additional capacity

GL1-GLm - line signal scan

SL1-SLn, R1-R4, G1-G4 and B1-B4 - line video

CR1-CR4, CG1-CG4 and CB1-CB4 - control signal switch

V1-Vt - analog voltage

The best mode of carrying out the invention

Figure 1 is a block diagram showing the configuration of a liquid crystal display device according to a variant implementation of the present invention. The liquid crystal display device 1 shown in figure 1, includes a matrix of 2 pixels, the exciting circuit 3 of the signal lines of the scan, the exciting circuit 4 lines of the video signal, n analog switches 5 and 6 control switch and performs color display using RGB-scheme by excitation with time division lines of the video signal. Next assume that m is an integer greater than or equal to 2, n is a multiple of 12, t is n/12, i is an integer from 1 to m, j is an integer from 1 to n and k is an integer from 1 d is t.

Matrix 2 pixels includes m lines GL1-GLm signal scan, n lines SL1-SLn video signal and the (mn) pixel circuits Pij placed in a two-dimensional plane. Lines GL1-GLm signal scan is placed in parallel with each other, and the lines SL1-SLn video signal are parallel to each other so as to be orthogonal to the lines GL1-GLm signal scan. The pixel circuit Pij is about crossing the line GLi signal sweep and line SLj video. Each pixel circuit Pij corresponds to one pixel or display element. Each of the lines GL1-GLm signal scanner connected together to pixel circuits Pij placed in one identical line, and each of the lines SL1-SLn video connected together to pixel circuits Pij is placed in one identical column.

Figure 2 is an equivalent schematic diagram of the pixel circuits Pij. The pixel circuit Pij includes, as shown in figure 2, a TFT (thin film transistor) 11, a container 12 of a liquid crystal and an auxiliary capacitance 13. The output of gate TFT 11 is connected to the line GLi signal scan, the output drain is connected to the line SLj video signal, and outputting a drain connected to one electrode of each of the containers 12 of the liquid crystal and the auxiliary capacitance 13. To the other electrode of the capacitance 12 of the liquid crystal and the auxiliary capacitance 13 is relevant to the military applied the common voltage VCOM electrode and the voltage VCS of the auxiliary container.

Pixel circuits Pij in each column correspond to any of the red, green and blue, which are used for color display. The pixel circuit (represented as R) in the first, fourth, seventh, etc. columns correspond to the red, the pixel circuit (represented as (G) in the second, fifth, eighth, etc. columns correspond to the green, and a pixel circuit (represented as B) in the third, sixth, ninth, etc. columns correspond to the color blue. In fact, the pixel circuits Pij placed side by side in the first direction (line direction) and the second direction (column direction), and each aligned pixel circuits Pij in the second direction (the column of the pixel circuits) corresponds to any of the colors used for color display.

Exciting scheme 3 lines signal scan select lines GL1-GLm signal scan. More specifically, the drive circuit 3 of the signal lines scan sequentially selects one signal line scan of the number of lines GL1-GLm signal of each scan period of the horizontal sweep and provides a selective voltage (for example, high level) of the selected line signal scan and provides a non-selective voltage (for example, low level) to other lines of the sweep signal. Accordingly, the pixel circuits Pij placed in one identically the th row, selected at one time.

Line video signals SL1-SLn are grouped every 12 lines of the video signal according to the stacking order, whereby is formed t (=n/12) groups. Further in this document 12 lines of the video signal belonging to each group, referred to as R1, G1, B1, R2, G2, B2, R3, G3, B3, R4, G4 and B4 in the stacking order. Lines R1-R4 video is a line of video signals corresponding to red, lines G1-G4 video - this line of the video signal corresponding to green, and the line B1-B4 of the video signal is a line of the video signal corresponding to blue.

Exciting scheme 4 lines of video signal outputs in each group of lines of video signals SL1-SLn voltage that must be applied to the lines of the video signal in the group, in the regime of temporary separation during the period of the horizontal sweep. More specifically, the drive circuit 4 lines of the video signal is t (equal to the number of groups of lines of the video signal) outputs and includes a register that stores at least n units of video data, schema, data selection and t-analog converters (none of them shown). In the exciting circuit 4 lines of the signal is n units of video data Din in the period of the horizontal scan from an external source. N units of the video data stored in the register. The scheme performs data selection the selection process for t units of video data in advance, and the E. a specific order from among the n units of the video data, stored in the register 12 times during the period of the horizontal scan. t d / a converters convert one unit of video data that is output from the circuit selection data into an analog voltage. The analog voltage produced by k-analog Converter, the output of the k-output of the driving circuit 4 lines of the video signal as an analog voltage Vk.

The analog switches 5 and 6 control switch act as circuit line selection signal, as shown below, which selects one line of the video signal from each group and provides the voltage outputted from the driving circuit 4 lines of the video signal in the selected line of the video signal, respectively.

Twelve lines R1-R4, G1-G4 and B1-B4 of the video signal belonging to the k-group associated with the k-th output of the driving circuit 4 lines of video, and 12 analog switches 5 are provided between them. More specifically, one end of the lines R1-R4, G1-G4 and B1-B4 signal respectively connected to the analog switches XR1-XR4, XG1-XG4 and XB1-XB4, and the other end of these 12 analog switches is connected to k, the output of the driving circuit 4 lines of video signal. One of these 12 analog switches switches into the conducting state, and the analog voltage Vk is available in one of e the 12 lines of the video signal, belonging to the k-th group. Note that the analog switches 5 is formed, for example, through the use of a TFT LCD panel, where the matrix 2 pixels formed.

Scheme 6 switch control outputs 12 signals CR1-CR4, CG1-CG4 and CB1-CB4 control switch based on two control signals FP and LP. The control signal FP is a signal indicating that there is an even or odd frame, and it changes between the high level and low level of each vertical blanking period. The control signal LP is a signal indicating that there is an even or odd line, and it changes between a high level and a low level every horizontal scan period. Signals CR1-CR4, CG1-CG4 and CB1-CB4 control switch serves to control outputs 12 analog switches XR1-XR4, XG1-XG4 and XB1-XB4 provided in each group. Next, it is assumed that each analog switch 5 switches to the conducting state when the corresponding control signal switch has a high level, and becomes non-conductive state when the corresponding control signal switch has a low level.

In the liquid crystal display device 1 of one horizontal scan period is divided into 12 (equal to the number of lines of video per group) small periods. Scheme 6 panel shall the exercise by the switch controls each of the 12 signals CR1-CR4, CG1-CG4 and CB1-CB4 control switch to switch to the high level for only one short period in the horizontal scan period. For example, when the signal CR1 control switch has a high level, the analog switches XR1 provided in the respective groups are in a conductive state, and thus t the outputs of the driving circuit 4 lines of the video signal is electrically connected to the line R1 of the video signal belonging to the respective groups. Here analog voltage Vk is in line R1 of the video signal belonging to k-th group. In fact, when the signal CR1 control switch has a high level, the line R1 of the video (all t lines of the video signal)belonging to the respective groups are connected to the t outputs of the driving circuit 4 lines of video and excited at once by means of the driving circuit 4 lines of video signal. Similarly, when the signals CR2-CR4, CG1-CG4 and CB1-CB4 control switch has a high level, line R2-R4, G1-G4 and B1-B4 of the video signal belonging to the respective groups, respectively, are excited at once by means of the driving circuit 4 lines of video.

Scheme 6 switch control switches the order of the transition signals CR1-CR4, CG1-CG4 and CB1-CB4 control switch to high levels in cos the ve control signals FP and LP. Thus, the order of excitation of the 12 lines of the video signal in each group varies between the case of the even lines in the even frame, the case of odd lines in the even frame, the case of even-numbered lines in the odd frame and the case of odd lines in the odd frame (see figure 3, which is described below).

Control signals FP and LP are served not only in scheme 6 switch control, but also in the exciting circuit 4 lines of video signal. Scheme of data included in the exciting circuit 4 lines of the video signal, selects on the basis of control signals FP and LP t units of video data from among the n units of the video data according to the order of excitation of the 12 lines of the video signal in the group.

In fact, the liquid crystal display device 1 groups lines SL1-SLn video every 12 lines of the video signal according to the stacking order, selects one output of the driving circuit 4 lines of the video signal to each group and stimulates the lines of the video signal in each group in the temporary separation during the horizontal scan period, and switches the order of the excitation lines of the video signal in each group of four ways based on the control signals FP and LP.

Figure 3 is a diagram showing the order of the excitation lines of the video signal in the group in the liquid crystal display device 1. As shown in figure 3, the 12 lines of the video signal in the group is e excited in the order B1, R1, G2, R3, B3, G4, G1, R2, B2, G3, R4 and B4 for even lines in the even frame and excited in the order B2, R2, G1, B4, R4, G3, G2, B1, R1, G4, R3 and B3 for odd lines in the even frame and excited in the reverse order of this order, for even lines in the even frame, the odd lines in the odd frame and excited in the reverse order of this order, for odd lines in the even frame odd lines in the odd frame. Note that, since the order of the excitation lines of the video signal and the order of the voltages in the pixel circuit is identical, we can say that figure 3 also represents the order of the write voltage in the pixel circuit.

Figure 4 is a timing diagram of the liquid crystal display device 1 for odd lines in the even frame. As shown in figure 4, the line voltage GLi signal scan is selective voltage (high level) during one horizontal scan period and the selection period of the line GLi signal scan is divided into 12 small periods, each of which has a length of T.

During the first short period signal CB1 switch control goes to a high level, and thus the analog switch XB1 12 analog switches provided in each group enters a conductive state. Here, the analog voltage Vk, which should be written in the pixel circuit Pij, under the prison to the line B1 video belonging to k-th group, and line GLi signal scan, derived from k-output of the driving circuit 4 lines of video signal. Analog voltage Vk is applied to the line B1 of the video signal belonging to the k-th group, through the analog switch XB1 provided in the k-th group. Similarly, within 2-12 on small periods analog voltage Vk is applied to the lines R1, G2, R3, B3, G4, G1, R2, B2, G3, R4 and B4 of the video signal belonging to the k-th group, in this order.

Analog voltage applied to the lines R1-R4, G1-G4 and B1-B4 of the video signal, respectively, are written in the pixel circuits Pij, connected to the corresponding lines of the video signal and the line GLi signal scan in the period in which the voltage in the line GLi signal scanner has a high level. In fact, for even lines in the even frame, 12 lines of the video signal in each group are excited in the order shown in figure 3, and the analog voltage applied to the 12 lines of the video signal, respectively, recorded in 12 of the pixel circuits Pij.

The liquid crystal display device 1 operates in the same way as described above for odd lines in the even frame, the odd lines in the odd frame and the odd lines in the odd frame. However, note that the 12 lines of the video signal in the group is excited in the order shown in figure 3.

The result is a liquid crystal display device 1 according to the present variant implementation is explained below with reference to figure 3, 5 and 6. Here a number of times when the lines of the video signal fall under the effect of pushing up, is compared between the case of excitation of the 12 lines of the video signal in the band in the manner shown in figure 3 (a liquid crystal display device 1), the case of excitation in the manner shown in figure 5 (first comparative example), and the case of excitation in the order shown in Fig.6 (second comparative example). On these drawings and the subsequent description of the fact that the line video falls under the effect of pushing up A time in the even frame and B times in the odd frame, represented as "A/B".

As described above, the time line of the video signal falls under the effect of popping up - this is the time when the line voltage signal, the adjacent (left or right adjacent lines of the video signal)is changed. Note that the line of the video signal is placed in the leftmost position in the group, falls under the effect of popping up when the line voltage signal, is placed in the rightmost position in the left adjacent group is changed, and the line of the video signal is placed in the rightmost position in the group, falls under the effect of popping up when the line voltage signal, is placed in the leftmost position in the right-adjacent group is changed.

In the first comparative example shown in figure 5,12 lines of the video signal in the band are excited sequentially to the left for even-numbered frame and excited sequentially to the right for odd-numbered frame. In this case, the number of times the line video fall under the effect of pushing up, is as much as shown in the lower section of figure 5. In particular, the number of times when the line R1 video falls under the effect of pushing up is 2/0 (twice in the even frame and zero times in the odd-numbered frame), the number of times line B4 video falls under the effect of pushing up is 0/2 (zero time in the even frame and twice in the odd-numbered frame), and the number of times when the other ten lines of the video signal fall under the effect of pushing up is 1/1 (once in the even frame and once in the odd frame).

In the first comparative example, the number of times the line video fall under the effect of pushing up, is any of 2/0, 1/1 and 0/2. By adjusting thus the number of times when the lines of the video signal fall under the effect of pushing up the vertical strip between the lines of the video signal can be prevented to some extent. However, in the liquid crystal display device charges in the pixel circuits become insufficient, and the viscosity of the liquid crystal is increased at low temperatures. Accordingly, the difference from the point of view of occurrence appears in the voltage application to the liquid crystal between the pixel circuit and, connected to a line of video signals that fall under the effect of pushing up 2/0 times, and pixel circuits connected to the line of video signals that fall under the effect of pushing up 1/1 times. The difference appears on the display screen as the difference in brightness between pixels, and thus a vertical band appears on the display screen. In fact, in the first comparative example, although the vertical strips at room temperature can be prevented, vertical stripes at low temperatures cannot be avoided.

In the liquid crystal display device 1, 12 lines of the video signal in the group is excited in the order shown in figure 3. In this case, the number of times these 12 lines of the video signal fall under the effect of pushing up, is as much as shown in the lower section of figure 3. In particular, for odd lines, the number of times a line of video (odd-numbered lines R1, B1, G2, R3, B3 and G4 video) in the group fall under the effect of pushing up is 2/0, and the number of times when the lines of the video signal with an even number (line G1, R2, B2, G3, R4 and B4 (video) in the group fall under the effect of pushing up is 0/2. For odd lines, the number of times when the lines of the video signal with an odd number in the group fall under the effect of pushing up is 0/2, and the number is creation time, when the lines of the video signal with an even number in the group fall under the effect of pushing up is 2/0.

In fact, in the liquid crystal display device 1, the order of the excitation lines of the video signal in each group varies between an even frame and an odd frame. For odd lines in the odd frame line of the video signal with an even number in the group instituted before the line signal output from the odd-numbered and even-numbered frame lines of the video signal with an odd number in the group instituted before the line video signal with an even number. For odd lines in the even frame line of the video signal with an even number in the group instituted before the line signal output from the odd-numbered and odd-numbered frame lines of the video signal with an odd number in the group instituted before the line video signal with an even number.

Thus, in the frame in which the lines of the video signal with an even number of excited earlier lines of the video signal with an even number fall under the effect of pushing up twice within one horizontal scan period, and in the frame in which the lines of the video signal with an odd number of excited earlier lines of the video signal with an odd number fall under the effect of pushing up twice within one period of the horizontal scan. Accordingly, the number of times the line video signal on adut under the effect of pushing up limited 2/0 and 0/2. Therefore, in contrast to the first comparative example, even when the operating conditions are unfavorable, for example at low temperatures, the difference from the point of view of occurrence does not appear in the voltage application to the liquid crystal, and thereby the occurrence of vertical stripes can be prevented.

In addition, as shown in figure 3, because the order of the excitation lines of the video signal in the group reversed between an even frame and an odd frame and varies between even and odd lines, the effects popping up, taken through lines of the video signal are symmetric relative to the direction of the lines in the group and thus are averaged between the lines. Accordingly, the occurrence of vertical stripes can more effectively be prevented.

In addition, figure 3 the result of the addition of a serial number of excitation for even lines in the even frame, the sequence number of excitation for odd lines in the even frame, the sequence number of excitation for odd lines in the odd frame and the sequence number of excitation for odd lines in the odd frame is identical. For example, when the sequence number of the excitation signal R1 are added, 2+9+11+4=26, and this result coincides with each of the arithmetic over the marketing of non-excitation of corresponding lines R2-R4, G1-G4 and B1-B4 of the video signal. By setting thus the results of adding the serial numbers of the excitation lines of the video signal in the same group effects popping up, taken through lines of the video signal in the group are averaged, and thus the occurrence of vertical stripes can more effectively be prevented.

Figure 3 the first and last lines of the video signal, which must be raised, are respectively B1 and B4 for even lines in the even frame, B2 and B3 for odd lines in the even frame, B4 and B1 for odd lines in the odd frame and B3 and B2 for odd lines in the odd frame. In fact, the first and last lines of the video signal, which must be raised in the group, is any of the lines B1-B4 of the video signal corresponding to blue.

In General, display devices that perform the excitation time division lines of the video signal, insufficient charge, probably occurs in the first and last lines of the video signal, which must be raised in each group, and insufficient charge, probably arises, in particular, in the last line of the video signal, which must be raised in the group. Color, in which the observer is the most difficult to recognize the change in brightness between the red, green and blue is blue. With this in mind, in the liquid crystal in which trojstva display 1 of the first and last lines of the video signal, which must be raised in each group, defined as any of the lines B1-B4 of the video signal corresponding to blue. This can make it difficult for observers to recognize the deterioration of image quality due to insufficient charge in the liquid crystal display device that performs color display using RGB-scheme via the excitation lines of the video signal in a temporary separation.

In addition, figure 3 the first line of the video signal, which must be raised in the group varies between the case of the even lines in the even frame, the case of odd lines in the even frame, the case of even-numbered lines in the odd frame and the case of odd lines in the odd frame, and the same applies to the last line of the video signal, which must be raised in the group. By switching the first and last lines of the video signal, which must be raised in the group, on the other on the frame-by-frame basis and a per-row basis, the lines of the video signal, where the lack of charge occurs, switch to the other, and thereby the deterioration of image quality due to insufficient charge can more effectively be prevented.

Note that in the second comparative example shown in Fig.6, the number of times the line video fall under the effect of pushing up assetdetail, as for the case of the liquid crystal display device 1 (Fig 3). However, since the line R1 of the signal excited in the last group in some cases, insufficient charge, probably arises, in particular, in line R1 of the signal. Because of insufficient charge, probably arises, in particular, in line R1 of the video signal corresponding to red, where the brightness change can be easily detected by observers, people easily recognize the deterioration of the image quality of a display screen. Therefore, a display device, in which the last line of the video signal, which must be raised in each group is not a line signal corresponding to a specific color (here, blue), are outside the scope of the present invention.

Although still described liquid crystal display device, which excites line of the video signal in the manner shown in figure 3, as an example of a display device that performs color display by excitation with time division lines of the video signal, various display devices can be configured in the same way. First, the order of excitation of the 12 lines of the video signal in each group can be arbitrary as long as the number of times the line video fall under the effect of vital the of up, is 2/0 or 0/2, and the last line of the video signal, which must be raised, is the line of the video signal corresponding to the color blue. In the display device of the present invention, the last line of the video signal, which must be raised in each group, there should be a line of the video signal that corresponds to a specific color (for example, blue), and it is preferable that the first line of the video signal, which must be raised in the group, was a line of video signal that corresponds to a specific color, which, however, is not necessary. In addition, instead of groups of lines of the video signal every 12 lines of the video signal line video can be grouped every s lines of the video signal (s is an integer greater than or equal to two).

Color display using a schema that is different from the RGB scheme, can be performed by providing the pixel circuits corresponding to, for example, white, blue and/or purple, in addition to the pixel circuits corresponding to red, green, and blue. In this case, the last (or first and last) line(s) of the video signal, which must be raised in each group, there should be a line signal corresponding to the color in which to observers is the most difficult to recognize to change the brightness of the colors used for CEE is its display. The pixel circuit can accommodate strips or bars as long as each alignment of the pixel circuits in the second direction corresponds to any of the colors used for color display. In addition, display devices other than liquid crystal display devices can be configured in the same way.

As described above, according to the liquid crystal display device in accordance with the present embodiment and various display devices in accordance with its varieties, when color display is performed using the excitation lines of the video signal in a temporary separation, vertical stripes and the deterioration of image quality due to insufficient charge can be prevented.

Industrial applicability

The display device of the present invention provides the effect of preventing vertical stripes and deterioration of image quality due to insufficient charge and thus can be used for various display devices such as liquid crystal display device.

1. A display device that performs color display by means of the excitation lines of the video signal in a temporary separation, and the display device the content is t:
many of pixel circuits that are positioned next to the first and second directions, each of the alignment of the pixel circuits in the second direction corresponds to any of the colors used for color display;
many of the signal lines of the scan, each of which connects together to pixel circuits aligned in the first direction;
many lines of video signals, each of which connects together to pixel circuits aligned in the second direction, and the lines of the video signal are grouped every predetermined number of lines of the video signal according to the order of placement;
- exciting circuit of the signal lines sweep for line selection signal scan;
- stimulating the scheme of lines of the video signal for output to each group of lines of the video signal voltage that must be applied to the lines of the video signal in the group, in the mode of time division within one horizontal scan period; and
diagram of line selection signal to select one line of the video signal from each group and providing a voltage output from the driving circuit lines of the video signal in the selected line of the video signal, respectively, with:
- the order of the excitation lines of the video signal in each group varies between an even frame and an odd frame and for each line in one of the CR, the s line of the video signal with an even number in the group excited before, what line of video signal with an odd number and one of the frame lines of the video signal with an odd number in the group instituted before the line video signal with an even number, and the last line of the video signal, which must be raised in the group is a line of the video signal that corresponds to a specific color.

2. The display device according to claim 1, in which in addition to the last line of the video signal, which must be raised in the group, the first line of the video signal, which must be raised in the group is a line of the video signal that corresponds to a specific color.

3. The display device according to claim 1, in which the order of the excitation lines of the video signal in the group reversed between an even frame and an odd frame.

4. The display device according to claim 1, in which the order of the excitation lines of the video signal in the group varies between even and odd lines.

5. The display device according to claim 4, in which the order of the excitation lines of the video signal in the group reversed between an even frame and an odd frame.

6. The display device according to claim 4, in which the result of the addition of a serial number of excitation for even lines in the even frame, the sequence number of excitation for odd lines in the even frame, the sequence number of excitation for odd lines in the odd frame and the sequence n is a measure of the excitation of the odd lines in the odd frame is the same for all lines of the video signal in the group.

7. The display device according to claim 4, in which the last line of the video signal, which must be raised in the group varies between the case of the even lines in the even frame, the case of odd lines in the even frame, the case of even-numbered lines in the odd frame and the case of odd lines in the odd frame.

8. The display device according to claim 7, in which in addition to the last line of the video signal, which must be raised in the group, the first line of the video signal, which must be raised in the group varies between the case of the even lines in the even frame, the case of odd lines in the even frame, the case of even-numbered lines in the odd frame and the case of odd lines in the odd frame.

9. The display device according to claim 1, in which the specific color is a color in which to observers is the most difficult to recognize to change the brightness of the colors used for color display.

10. The display device according to claim 9, in which the pixel circuits are provided a pixel circuit corresponding to red, green, and blue, and a specific color is blue.

11. The display device according to claim 1, in which:
as the pixel circuits is provided a pixel circuit corresponding to red, green, and blue,
- line of the video signal are grouped every 12 lines of the video signal, with each group including the et in the line R1-R4 video correspond to the red lines G1-G4 video signal corresponding to green, and the line B1-B4 of the video signal corresponding to blue, and the lines of the video signal are arranged in the order of R1, G1, B1, R2, G2, B2, R3, G3, B3, R4, G4 and B4, and
12 lines of the video signal in each group are excited in the order of B1, R1, G2, R3, B3, G4, G1, R2, B2, G3, R4 and B4 for even lines in the even frame and in the order B2, R2, G1, B4, R4, G3, G2, B1, R1, G4, R3 and B3 for odd lines in the even frame and in reverse order for the even-numbered frame odd frame.

12. The display device of claim 1, wherein the pixel circuit includes the capacitance of the liquid crystal.

13. The method of excitation for a display device, which includes many of pixel circuits that are positioned next to the first and second directions, each of the alignment of the pixel circuits in the second direction corresponds to any of the colors used for color display; many of the signal lines of the scan, each of which connects together to pixel circuits aligned in the first direction; and many lines of video signals, each of which connects together to pixel circuits aligned in the second direction, and the lines of the video signal are grouped every predetermined number of lines of the video signal according to the stacking order, the method of excitation contains stages, the cat is ryh:
- select line signal scan;
- provide each group of lines of the video signal voltage that must be applied to the lines of the video signal in the group, in the mode of time division within one horizontal scan period; and
- select one line of the video signal from each group and provide voltage, each of which is the temporary separation of selected lines of the video signal, respectively, with:
- the order of the excitation lines of the video signal in each group varies between an even frame and an odd frame and for each line in one of the frame lines of the video signal with an even number in the group instituted before the line video signal with an odd number and one of the frame lines of the video signal with an odd number in the group instituted before the line video signal with an even number, and the last line of the video signal, which must be raised in the group is a line of the video signal that corresponds to a specific color.



 

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Display // 2160933
The invention relates to image formation and can be used to display video information

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