Lcd structure for operation at low temperature

FIELD: physics.

SUBSTANCE: according to the method, electrical energy is supplied to the LCD, electrical signal is transmitted to the LCD for updating displayed information, ambient temperature in the vicinity of the LCD is measured, and energy and update information transmitted to the LCD are regulated based on ambient temperature. Field device (10) includes LCD (110), electronic control module (120), made with possibility of transmitting energy signals and connection to the LCD (110), and a temperature sensor (112), connected to the electronic control module (120). The electronic control module (120) is made with possibility of measuring ambient temperature close to the LCD (110), and control energy and connection to the LCD (110), based on temperature of the LCD (110).

EFFECT: increased reliability of operation at low temperature.

20 cl, 6 dwg

 

The LEVEL of TECHNOLOGY

Field devices such as transmitters process variables, are used in industry process control for remote reading of the process variable. Field devices, such as Executive agencies, are used by industry process control for remote control of physical process parameters such as flow rate, temperature, etc. process Variable can be passed in place of control from a field device such as a transmitter process variables to provide information about the process for the controller. The controller may then transmit the management information to the field device, such as an Executive body, to modify the parameter of the process. For example, information relating to the pressure of the fluid process, can be transmitted to control room and used to control the process, such as refining.

Transmitters process variables are used to control process variables associated with fluids, such as slurries, liquids, vapors and gases in the chemical, timber, oil, gas, pharmaceutical, food and other factories of the processing fluid. Process variables include pressure, temperature, flow, level, pH, conductivity, Mut is awn, density, concentration, chemical composition and other properties of the fluid. Executive bodies include adjusting the valves, pumps, heaters, mixers, coolers, solenoids, holes, and other devices to control fluid medium.

The INVENTION

Provided the method of controlling a liquid crystal display (LCD) (LCD), integrated within the sensor to operate at low temperature. The method includes providing electric power for the LCD, providing an electrical signal to the LCD to update the displayed information, the dimension of the ambient temperature, the nearest to the LCD, and the implementing regulations of energy and information pack supplied to the LCD based on the ambient temperature. Another aspect of the invention includes a field device, which includes LCD, electronic control module, configured to provide power and communication signals for the LCD, and a temperature sensor associated with the electronic control module. Electronic control module is configured to measure the ambient temperature, which is nearest to the LCD, and energy management and communications supplied to the LCD, based on the temperature in the LCD.

BRIEF DESCRIPTION of DRAWINGS

Fig. 1 is a schematic depiction of a field device of the type useful for the variants of implementation of the present invention.

Fig. 2 is a block diagram illustrating operation of the field device to extend the work of the LCD below its nominal (maximum allowable) operating temperature in accordance with some embodiment of the present invention.

Fig. 3 provides the list of parameters and their initial values in accordance with some embodiment of the present invention.

Fig. 4 is a block diagram of a method of reading the temperature of the LCD in accordance with some embodiment of the present invention.

Fig. 5A is a block diagram illustrating the phase update LCD display in accordance with some embodiment of the present invention.

Fig. 5B is a block diagram illustrating another stage of the update of the LCD display in accordance with some embodiment of the present invention.

DETAILED DESCRIPTION

Fig. 1 illustrates a block diagram of part of the field device 10 according to one variant embodiment of the invention. The field device 10 includes a liquid crystal display (LCD) 110, which is connected with the electronic control module 120. Electronic control module 120 includes, in one embodiment, the controller 122 associated with the storage device 124 and a data communication port 126, and a measuring circuit 130, which can be cha is part of an electronic control module 120.

Energy network receives electrical energy from a source 132 of power. The source 132 of the power may be of any type appropriate electric power source comprising a battery, the power source is alternating current (AC), the loop process control or any other device.

The field device 10 includes a sensor 134 associated with the electronic module 120 controls. The sensor 134 provides an input signal related to the parameter to be measurement field device 10. The sensor 134 may include one or more sensor elements using any appropriate technology. The sensor 134 may be integral with LCD 110 and is electrically connected to the measuring circuits 130, which may include the known control circuit sensor input. The field device 10 also includes a sensor 112 temperature associated with the electronic module 120 control through measuring circuit 130. The sensor 112 temperature reads ambient temperature, nearest to the LCD 110. The sensor 112 temperature may use any available technology, including thermocouples, resistance thermometers (RTD) and/or thermal switches/thermostats. The sensor 112 temperature is shown electrically connected to the measuring circuits 130, but it should be understood that the sensor 112 temperature can in order to be in electrical communication with a data communication port 126 or any other control circuits of communication, includes directly related to the controller 122, without going beyond the scope of the invention.

The block diagram 100 is a functional and schematic, and it should be understood that other implementations of electronic circuits within the field device 10 may be implemented without going beyond the scope of the invention. For example, the memory 124 and/or communication port 126 may be physically enclosed inside the controller 122. Energy network 128 may include any embodiments of the energy network, which includes regulators, voltage dividers, current limiters, etc. LCD 110 may be a commercially available device, custom liquid crystal display of any size or shape, and may be any method of electrical communication with the electronic module 120 control for the purpose of making data from the electronic module 120 of the control.

LCD, such as LCD 110, have a limited operating temperature range. For example, some LCD having a working range, which extends only to -4F (-20C). Other LCD can have operating ranges, which are determined to be higher or lower temperature than -4F. embodiments of the present invention can be applied to any LCD with any operating temperature.

Fig. 2 is a flowchart illustrating a method 200, describe what s the work of the field device 10 to extend the work of the LCD 110 below its nominal operating temperature in accordance with some embodiment of the present invention. In block 202, the electronic module 120, the control initializes the necessary parameters for the variables used in the invention. With brief reference to Fig. 3, is identified by the list of parameters and their initial values. For example, Sensor_Value (sensor value) is set as accitane, Display_Value (display value) is set as undefined, and Dynamic_Power_Supply (dynamic power) is set as "off". Other parameters, such as Setpoint_1 (set value 1), are set to the values that, in one embodiment, is stored in the memory 124 of the electronic module 120 controls. The value of the parameters listed in Fig. 3, will become more apparent as the function of the electronic module 120 controls described in more detail below.

Once the initialization stage of the parameters is performed in block 202, the electronic module 120, the control will read the value 204 of the sensor from the sensor 134. Then, the electronic module 120, the control will read LCD temperature sensor 112 temperature, as shown in block 206. Once as the sensor value and the temperature value received, the electronic module 120, the control will update the LCD display 110, as shown in block 208. Electronic module 120 then cyclic control passes back to block 204 to repeat the process of reading the value of the sensor, making the value of the temperature is s and updates the display.

Stage 204 reading sensor values from the sensor 134 can be completed in any number of ways. As described above, the sensor element may be electrically connected to the measuring circuits 130. Next, the phase of the read sensor values may include any number of ways to provide a single value. As an example, the electronic module 120 control can read multiple values from the sensor 134 and to perform the averaging function to eliminate or to deal with hysteresis or peaks in the voltage sensor. Any available procedure for reading and processing sensor values can be used without going beyond the scope of the invention.

Fig. 4 is a block diagram of a method 250 that provides for the stage 206 read LCD temperature in more detail according to one variant embodiment of the invention. After the start in block 252, the electronic module 120 reads the LCD temperature sensor 112 temperature. As with stage 204, described above, any number of procedures input sensor may be used to provide values for LCD temperature. Since LCD temperature has been read, it is compared with Setpoint_1 in the block decision 256. If the LCD temperature not less than Setpoint_1, Dynamic_Power_Supply is set to Off ("off"), Update_Interval (and is the update interval is set to Normal and Reduced_Complexity (reduced complexity) is set to Off. At this stage, the function 206 read LCD temperature ends, and the electronic module 120, the control moves to block 274, which is the end of this procedure.

Returning again to block 256, if the LCD temperature less than Setpoint_1, Dynamic_Power_Supply is set to on (enabled), as described in block 260. Once Dynamic_Power_Supply is set to on, the electronic module 120 controls will provide additional energy for LCD 110. In one embodiment, the second source 146 power supply for LCD served or otherwise associated with the LCD in addition to the first source 144 power supply for LCD. Alternatively, additional energy is supplied to the first line 144 power supply LCD from the power grid to the LCD. Additional energy is provided to the LCD, can be abstracted from other circuits within the electronic module 120 controls. At lower temperatures a lot of electrical devices within the electronic module 120 controls may require less energy. Thus, this energy can be fed to the LCD 110 without affecting the function of each component within the electronic module 120 controls. Energy network 128 may include any type of schemes required to divert energy from other devices to the LCD display. Additionally, or alternatively, any appropriate heat-sensitive elementmodel to be read or used for the dynamic variation of energy to the LCD based on the temperature. Temperature-sensitive diode can be used in such a way that the temperature drop voltage of the diode decreases as well. The voltage drop can be read, and more energy can be fed to the LCD driver.

Once Dynamic_Power_Supply was set to on (enabled), in block 260, the electronic module 120 control then proceeds to block 262 a decision to determine whether the LCD temperature less than Setpoint_2. It should be understood that in one embodiment, Setpoint_2 has a lower value than Setpoint_1. For example, Setpoint_2 in one embodiment, is -15F (-26C). Setpoint_2 may vary depending on the rated operating temperature of the LCD 110. If the LCD temperature is not less than Setpoint_2, the electronic module 120 control passes to block 264 where Update_Interval is set on Normal, and Reduced_Complexity is set to Off. Electronic module 120 control then proceeds to block 274, which represents the end stage 206 read LCD temperature.

Returning again to block 262, if it is determined that the ambient temperature LCD less than Setpoint_2, the electronic module 120 control passes to block 266 and Update_Interval is set to Extended. Update_Interval specifies the amount of time that elapses between updates of the LCD display. When the temperature of the interface among LCD above Setpoint_2, Update_Interval is set to Normal. In one embodiment, Normal is set to or otherwise corresponds to the update interval in three seconds. Thus, when Update_Interval is set to Normal, the LCD is updated every three seconds. Alternatively, the value assigned to Normal, there may be any number that provides the available update rate of the display when the ambient temperature LCD higher than Setpoint_1. In one embodiment, the value assigned to Extended, is six seconds. Thus, when the ambient temperature of the LCD below Setpoint_2, the display would be updated every six seconds. The value assigned to Extended, can be any value that provides the available refresh rates for LCD, when the temperature is below Setpoint_2. For example, the value assigned to Extended, could be eight seconds, ten seconds or twenty seconds. Alternatively, Extended can be set to different values depending on whether the ambient temperature LCD below Setpoint_2.

Once Update_Interval was installed on the Extended block 266, the electronic module 120, the control compares the ambient temperature of the LCD with Setpoint_3 in block 268. You should appreciate that Setpoint_3 is a lower temperature than the temperature value Setpoint_2. In one embodiment, Setpoint_3 ustanavlivat is camping at -28F (-33,3C). Value Setpoint_3 can be any value that matches the value, which should be taken additional steps (stages) in excess of the expansion velocity update and provide additional energy for LCD, taken above. If it is determined that the ambient temperature of the LCD is higher than Setpoint_3, Reduced_Complexity off on stage 270 and the electronic module 120, the control proceeds to step 274, which is the end of the function the temperature settings.

Returning to block 268, if the ambient temperature LCD, however, lower than Setpoint_3, Reduced_Complexity 272 is set to on. The effects of what Reduced_Complexity set to on, will be discussed later in relation to the process of the update of the display corresponding to the block 208. Once Reduced_Complexity was set to on on the stage 272, electronic module 120, the control proceeds to step 274, which represents the end stage 206 read LCD temperature.

With reference to Fig. 5A, a block diagram 300 provides a functional description stage 208 updates the LCD display performed by the electronic module 120 according to one variant embodiment of the invention. Beginning at block 302, the electronic module 120 control passes to block 304 decision-making, where it compares the value Update_Time value Update_Interval. Update_Time is a timer that Ecclesiae the amount of time, which is since, as was last updated LCD display. If Update_Time not equal to or greater than Update_Interval, the electronic module 120 control proceeds to block 314, which represents the end of the function updates the display. Alternatively, the electronic module 120 controls can remain in block 304 until Update_Time not more than Update_Interval.

If it is determined that Update_Time in fact more than Update_Interval, the electronic module 120 control proceeds to block 306. In block 306, the electronic module 120, the control checks the status Reduced_Complexity. If Reduced_Complexity set to Off, the electronic module 120 control proceeds to block 308. In block 308, the electronic module 120 control assigns the variable display the value of the variable values of the sensor. The display is then updated with all the information that is usually provided for display. This information includes, in one embodiment, the display value and the unit of measurement associated with the display value. Alternatively, any number of positions may be included in the LCD display. Once the display has been updated, Update_Time is set in the initial state and the electronic module 120 control proceeds to block 314, which represents the end of the update procedure of the display.

Returning again to block 306, if the electronic module 120 controls the definition is employed, what Reduced_Complexity is set to on, the electronic module 120 control passes to block 310 decision. In block 310 a decision Display_Value compared with the value of the sensor. If Display_Value equal to the value of the sensor, the display is not updated and the electronic module 120 control proceeds to block 314, which represents the end of the function updates the display. However, if Display_Value not equal to the value of the sensor, the electronic module 120 control proceeds to block 312, where Display_Value is set equal to the sensor value. Then the display is updated with the new Display_Value. However, no other elements on the display are not updated. It is possible that only item visible on the display 110 will be by the sensor value. If the LCD display has been updated, Update_Time is set to zero and the electronic module 120 control proceeds to block 314, which represents the end of the update procedure of the display.

With reference to Fig. 5B, a block diagram 350 provides a functional description stage 208 updates the display according to another variant embodiment of the invention. Electronic module 120 control starts at block 352 and proceeds to block 354 decision. In block 354 decision Update_Time compared with Update_Interval. If Update_Time is not equal to or greater than Update_Interval, the electronic module 120 control proceeds to block 364, which performance is made by the end of the update procedure of the display.

Returning again to block 354, if Update_Time greater than or equal to Update_Interval, the electronic module 120 control proceeds to block 356 decision. In block 356, if Reduced_Complexity set to Off, the electronic module 120 control proceeds to block 358. In block 358 Display_Value is set equal to the value of the sensor, the LCD display is updated by the value Display_Value, as well as all other information that might be visible on the display 110. Update_Time is then set to zero, and the electronic module 120 control proceeds to block 364, the end stage 208. Returning again to block 356, if Reduced_Complexity set to on, the electronic module 120 control passes to block 360. In block 360 Display_Value compared with the value of the sensor. If Display_Value equal to the sensor value or is within a specified Tolerance values of the sensor, the electronic module 120 control proceeds to block 364, the end stage 208. Tolerance is the value set in the initialization stage values. Although variable Tolerance, in one embodiment, attributed to a single, immutable value, Tolerance can alternatively be many different values corresponding to different values of Tolerance, depending on whether the ambient temperature LCD below Setpoint_3. By changing the values of the LCD display only when Sensor_Value from ICUMSA from Display_Value more than the Tolerance value, some precision may be sacrificed on the LCD 110. However, the LCD 110 can operate at a lower temperature, since the display is not updated so often.

Returning again to block 360, if Display_Value differs from Sensor_Value more than the value attributed to Tolerance, Display_Value is set equal Sensor_Value, and the display value is updated on the LCD 110. It should be understood that any other part of the display that can be seen, will not be updated. For example, unit of measure, which can be normally displayed, will not be updated. Update_Time is then set to the initial state, and the electronic module 120 control proceeds to block 364, which is the end of the update function display.

Although embodiments of shown in Fig. 5A and 5B and described above differ in their approach to the management of the display when the temperature is below Setpoint_3, it should be understood that in another embodiment could be implemented in additional Setpoint, having a lower temperature than Setpoint_3. In this embodiment, the display may not be updated until the sensor value does not differ from Display_Value, when the temperature is below Setpoint_3. When the temperature is below additional Setpoint, however, the Tolerance value is assumed and the value of the display would be updated only when Display_Value neykovtsi within tolerance level sensor values. Such an implementation option would limit the amount of time in which it is assumed tolerance, when compared Display_Value and values of the sensor, thereby reducing the likelihood that the display value is not equal to exactly what is the value of the sensor at any given time.

Although this invention has been described with reference to several alternative embodiments, specialists in the art it will be clear that there may be changes in form and detail, without going beyond the nature and scope of the invention.

1. The method of controlling a liquid crystal display (LCD) in a field device for operation at low temperature, and the method comprises: providing a first level of electrical energy to the LCD to function LCD display; providing an electrical signal to the LCD to update the information displayed on the LCD; providing a first predetermined temperature; measuring the ambient temperature near the LCD; providing a second level of electrical energy to the LCD when the measured ambient temperature is lower than the first preset temperature; setting the refresh interval to the first duration of time, and phase of the electrical signal to the LCD to update the information displayed on the LCD, runs periodically with inter the crimson pack; providing the second predetermined temperature value and set the refresh interval for the second duration of time when the measured ambient temperature is lower than the second preset temperature value, the second duration of time is longer than the first duration of time.

2. The method according to claim 1, in which stage of the installation of the update interval to the first duration of time includes setting the refresh interval to 3 seconds

3. The method according to claim 1, in which stage of the installation of the update interval for the second duration of time includes setting the refresh interval to 6 C.

4. The method according to claim 1, further providing a third predetermined temperature value and at this stage provide an electrical signal to the LCD provides information to update only part of the LCD, when the measured ambient temperature is lower than the third preset temperature value.

5. The method according to claim 4, in which the phase of the electrical signal to the LCD includes providing information to update sensor values and units of measurement on the LCD and in which stage of providing an electrical signal to the LCD includes ensuring that only information to update the value of the sensor when the measured ambient temperature is lower than the third set value te is the temperature.

6. The method according to claim 5, in which the phase of the electrical signal to the LCD, when the measured ambient temperature is lower than the third set value of the temperature is performed only when the information to update the value of the sensor differs from the information to update sensor values sent in the previous update.

7. Field device for use in the production process, and that the field device includes a liquid crystal display (LCD); an electronic control module having a memory, and an electronic control module associated with the LCD and configured to provide a signal power and a communication signal to the LCD; the temperature sensor functionally associated with the electronic control module, the temperature sensor configured to provide instructions regarding the ambient temperature near to the LCD and the electronic control module is arranged to provide signal power and the communication signal based on the ambient temperature.

8. The field device according to claim 7, in which the temperature sensor is integral with the LCD.

9. The field device according to claim 7, in which the memory stores information regarding the first predetermined temperature and in which the electronic control module is configured to provide the of igala energy to LCD, when the measured ambient temperature is below the first predetermined temperature value.

10. Field according to claim 9, in which the electronic control module is connected with the circuit power source for providing electrical energy to the electronic control module and in which the electronic control module is arranged to discharge of the energy otherwise provided to the electronic control module to the LCD.

11. The field device according to claim 7, in which the memory stores information regarding a time interval in which the electronic control module is configured to periodically provide the communication signal with a frequency determined this time interval.

12. The field device according to claim 11, in which the memory stores information regarding the second predetermined temperature and in which the electronic control module configured to assign the first value to the time interval when the ambient temperature is above the second predetermined temperature value, and assigning the second value to the time interval when the ambient temperature is below the second predetermined temperature value.

13. Field device 12, in which the first value is 3 seconds.

14. Field device 12 in which the second value is 6 C.

15. Previoustitle according to claim 7, in which the memory stores information regarding a third predetermined temperature and in which the electronic control module is configured to update only part of the LCD, when the ambient temperature is below a third predetermined temperature value.

16. The field device according to item 15, in which the electronic control module is configured to update information of the sensor and information about the unit of measurement on the LCD and in which the electronic control module is configured to update only the information of the sensor when the ambient temperature is below a third predetermined temperature value.

17. The field device according to clause 16, in which the electronic control module is configured to update information of the sensor only if the sensor information has changed.

18. Field device 17, in which the electronic control module is configured to update information of the sensor only if the sensor information has changed by more than the given value.

19. The field device containing a liquid-crystal display (LCD)is made with the possibility of making signals energy and communication; and means for controlling signal power and communication to the LCD based on the ambient temperature.

20. The method of controlling the liquid crystal display LCD) field device, moreover, this method provides a level of electric power to the LCD to function LCD display; providing an electrical signal to the LCD to update the information displayed on the LCD; the provision of a device that has an electrical characteristic that varies with temperature; thermal binding temperature-sensitive device with LCD display; reading the temperature-sensitive characteristics of the temperature-sensitive device and the variation of the amount of information displayed by LCD, based on a few characteristics.



 

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20 cl, 4 dwg

FIELD: physics.

SUBSTANCE: presence of change of view in a video sequence is detected. The value of the backlight brightness level of the current frame in said video sequence is determined based on image characteristics in said current frame. Said value of backlight brightness level is filtered by a first filter when change of view is defined as close to said current frame; and said value of backlight brightness level is filtered by a second filter when change of view is not defined as close to said current frame.

EFFECT: filtering the backlight brightness level of a display using an adaptive filter based on presence of change of view near the current frame.

20 cl, 98 dwg

FIELD: information technology.

SUBSTANCE: histogram calculation process calculates an image histogram. A distortion module uses the histogram value and distortion weight in order to determine distortion characteristics for various backlight illumination levels, and then selects the backlight illumination level which lowers or minimises the calculated distortion. After selecting the backlight illumination level, the backlight signal is filtered by a time filter in a filtration module. A Y-amplification projecting module is used to determine the image compensation process. This compensation process involves application of the curve of the tonal range to the brightness channel of the image.

EFFECT: amplification of an image formed by displays which use light radiators, owing to adjustment of pixel brightness and setup of the light source of the display to different levels in accordance with image characteristics.

20 cl, 107 dwg

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