Liquid-crystalline display

FIELD: engineering of displays.

SUBSTANCE: to decrease number of external outputs of screen in liquid-crystalline display, containing two dielectric plates with transparent current-guiding electrodes applied on them, each electrode of one plate is connected to selected electrode of another plate by electric-conductive contact, while each pair of electrodes is let out onto controlling contact zone, and electrodes, forming image elements of information field of screen, on each plate are positioned at angle φ similar relatively to external sides of plates, while angle φ satisfies following condition: 10°≤φ≤85°.

EFFECT: decreased constructive requirements for display.

4 cl, 4 dwg, 1 tbl

 

The invention relates to the display equipment, namely, LCD screens, and can be used to create a display device individual and collective use.

Structurally, the LCD screen is a flat capillary consisting of two parallel pasted on the perimeter of the dielectric (e.g. glass) plates on the inside facing each other, the surfaces of which are covered with transparent conductive electrodes specific configuration for forming picture elements of the screen are covered with a dielectric orienting films, filled with liquid crystal through the hole in the capillary. On the outer surfaces of the capillary are Polaroid (Indicator liquid crystal devices./Edited Suhotra. - M.: Owls. Radio, 1980, pp. 80-135).

There are various liquid crystal indicating device, which differs formation of controlled electrodes of the screen.

First, the formation of the controlled electrodes of the screen is that on one of the plates are image elements and each element for its management has an individual external contact pad (see ibid., p.85, 86, RIS and 3.11). On the other plate is formed a common electrode for all of the elements of the image is of the first plate, having at least one external contact pad.

The disadvantage of this design is that in the presence of N picture elements of the screen, you will need N+1 external contact areas, a large number of control output circuits virtually eliminates the creation of screens large information capacity.

Secondly, the formation of the information field of the screen is that the image elements on the same wafer groups (rows)consisting of a set of image elements and each group (row) has one external control contact pad. On another plate also formed groups (columns) of the image elements. When the wafers in the capillary electrodes on both plates form the projection matrix of picture elements consisting of Y rows and X columns. The number of picture elements is At·X, and the number of control external contacts is Y+X (see ibid., p.106, RIS - prototype).

The disadvantage of this construction the liquid crystal device is that:

as in the first case, to control the screen requires a large number of external control contacts (Y+X), respectively, and output circuits;

- pad rows and columns are located on mutually opposite sides of the screen that the OTF is to limit the number of electrically independent matrices, formed in one screen, for example, for a passive-matrix liquid crystal displays used only two independent matrices in one screen. This significantly limits the news screen and imposes strict limitations to the design of the display part of the requirements to the parameters of the liquid crystal and the orientation of liquid crystal molecules.

The invention consists in the following. The problem to which the invention is directed, is to reduce the number of external terminals of the screen, inherent in the standard matrix version of the electrodes while maintaining the number of elements in the image and reducing the design requirements to the screen due to the possibility of its formation from N independent managed matrices.

This technical result in the implementation of the invention is achieved in that in a liquid crystal display containing two dielectric sheets, at least one of the transparent plates, coated on the inner surface of plates of transparent conductive electrodes forming elements of the image information screen fields specified configuration, covered with a dielectric orienting film, United perimeter sealant in a flat capillary tube filled with liquid crystal, Polaroid on the outer surface the values of the plates and the external control pads, every one electrode plate is connected to the selected electrode of another plate of electrically conductive contact with each pair of electrodes is printed on one common control contact pad, and the electrode forming elements of the image information screen fields, on each of the plates are located under identical to the outer sides of the angle plates ϕwhile the angle ϕ satisfies the following condition: 10°≤ϕ≤85°.

In addition, the LCD screen contains j, where j=1, 2, 3,..., N are electrically independent managed matrix screen with a constant pitch of the picture elements of the information field over the entire screen, or with a different pitch of the picture elements of the information field in each of the matrices of the screen; external control pads are arranged on parallel sides of the screen; the electrical contacts in the pair of electrodes of one and the other plates are made on the periphery of the screen in the area of external control pads anisotropically paste.

The invention is illustrated graphics, descriptions and examples of specific performance.

Figure 1 shows the design of the LCD screen.

Figure 2 schematically shows the arrangement of electrodes on each of the plates at an angle ϕ to the outer sides of the plates,

In Fig. schematically the design of the electrodes and their connection with external control pads.

Figure 4 schematically shows the information field of the LCD screen with j, where j=1,2,3,..., N are electrically independent managed matrix screen with a constant pitch of the picture elements of the information field over the entire screen.

In the drawings, the following notation:

1, 2 - two dielectric sheets, at least one of the transparent plates;

3 sealant;

4 - the liquid crystal;

5, 6 - conductive electrodes;

7, 8 - dielectric orienting film;

9, 10 - Polaroid;

11 - external control pads;

12 - the elements of the image information field;

13 - conductive contact.

We offer an LCD screen (see figure 1) consists of two parallel transparent glass plates 1 and 2, joined at the perimeter sealant 3, so that the formed flat capillary with an external control pads 11. In the gap of the flat capillary entered the liquid crystal 4, then the gap is sealed with a sealant. On the inner sides of the plates 1 and 2 deposited transparent conductive electrodes 5 and 6 in the form of a pattern - specified configuration, forming the picture elements of the information field of the LCD screen. Transparent conductive electrodes 5 and 6 are covered with the dielectric orienting film 7, and 8 On the outer surface of the dielectric plate caused Polaroid 9 and 10.

Figure 2 shows the location of the electrodes at an angle ϕ to outer sides of the dielectric plates 1 and 2, the angle ϕ satisfies the following condition: 10≤ϕ≤85°.

These parameters angle ϕ determined experimentally based on the known laws adopted when designing LCD screens, including the geometry of the applied dielectric plates: rectangular or diamond shape.

The work of the LCD screen as follows.

When voltage is applied to the selected electrodes 5, 6 made of transparent conductive material deposited on a dielectric plate, for example of glass 1 and 2, a reorientation of liquid crystal molecules 4. As a result of reorientation of the liquid crystal molecules 4 a change in the light transmittance on the selected picture element information field. The uniqueness and independence of the choice of any picture element information field in the proposed design the LCD screen is illustrated by examples.

EXAMPLE 1

Was the prototype of the LCD screen according to the claimed technical solution. Figure 1 shows that the electrode 5 of the same plate 1 connected to the selected electrode 6 different plate 2 switching-mode power is wodnym contact 13. Figure 3 shows 24 external control pads 11, the configuration drawings of the electrodes 5 and 6 on one 1 and the other 2 dielectric glass plates, as well as the scheme pairwise connection of the electrodes with the external control pads.

The table shows the combination of the external control pads, when the supply voltage which turns on any of the items of image information screen fields. The table shows that any one of the selected combinations of feeding the control voltage to the external contact pads includes only a single necessary element of the image. The example shows that when the number of picture elements 288 pieces number of external pins in the proposed design the LCD screen is 24, and when the standard matrix connection for the same number of picture elements will need 34 external output.

EXAMPLE 2

Was made a prototype of the LCD screen according to the invention. Figure 4 schematically shows that the proposed design of the LCD screen allows one screen to form j independently controlled matrices, where j=1, 2, 3,..., N, with persistent regularity of the image elements in the information field of the screen in each mA is the matrix. The size of the LCD screen is limited only by the technological possibilities.

The effectiveness of the present invention is to reduce the number of external managers pads that will reduce the number used to control terminals of the chip and to increase the reliability of LCD screens, as well as to reduce the requirement for design of liquid-crystal display by use of N independently controlled matrix.

1. LCD screen containing two dielectric sheets, at least one of the transparent plates, coated on the inner surface of transparent conductive electrodes forming elements of the image information screen fields specified configuration, covered with a dielectric orienting film, United perimeter sealant in a flat capillary tube filled with liquid crystal, Polaroid on the outer surfaces of the plates and the external control pads, wherein each electrode of one plate connected to the selected electrode of another plate of electrically conductive contact with each pair of electrodes is printed on one common control contact pad, and the electrode forming elements of the image information field screen, each layer is located under identical to the outer sides of the angle plates ϕ when this angle ϕ satisfies the following condition: 10°≤ϕ≤85°.

2. The LCD screen according to claim 1, characterized in that it contains j, where j=1, 2, 3,...,N, is electrically independent of the managed matrix screen with a constant pitch of the picture elements of the information field around the screen or with a different pitch in each of the matrices of the screen.

3. The LCD screen according to claim 1, characterized in that the external control pads are arranged on parallel sides of the screen.

4. The LCD screen according to claim 1, characterized in that the electrical contacts in the pair of electrodes of one and the other plates are made on the periphery of the screen in the zone control pads anisotropic conductive paste.



 

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