Liquid crystal display
A liquid crystal display of the present invention facilitates grayscale level transition from a previous frame to a current frame, in such a manner that a modulation driving process section reads out, from one look-up table, corrected image data corresponding to a combination of image data of a previous frame and image data of a current frame and then outputs this corrected image data, irrespective of the ambient temperature. Meanwhile, a temperature circuit controls a heater so as to either stop the heating by the heater when a temperature of the liquid crystal panel exceeds a threshold value which is 1° C. through 1.5° C. higher than a target temperature, or start the heating by the heater when the temperature of the liquid crystal panel goes below a threshold value which is 1° C. through 1.5° C. lower than the target temperature, the target temperature being determined in advance to be in a range between 48° C. and 63° C. In this manner, it is possible to realize a liquid crystal display which is simple in circuit arrangement but can improve a response speed while restraining the degradation of display quality to be hardly recognizable for the viewer.
1. A liquid crystal display, comprising:
a memory storing, until a next time, current data indicating current brightness of each pixel provided in a liquid crystal panel;
a look-up table precedently storing (i) combinations of previous data and the current data, the combinations having possibilities to be inputted, and (ii) output signals corresponding to the respective combinations;
control means for outputting an output signal as corrected current data in order to facilitate grayscale transition from a previous time to a current time, by reading out, from the look-up table, data corresponding to a combination of previous data read out from the memory and current data, and outputting that data or that data after being interpolated, instead of the current data;
a heater heating the liquid crystal panel, the heater including a plurality of heater electrodes, each of the plurality of heater electrodes being formed as a linear band aligned to be in parallel with a side of the liquid crystal panel; and
heater control means for controlling start and stop of heating by the heater, in such a manner as to keep a sensed temperature of the liquid crystal panel to be not more than ±3° C. of a predetermined target temperature which is within a range between 33° C. and 63° C., the sensed temperature of the liquid crystal panel being determined by sensing a temperature of a plurality of separate sections of the liquid crystal panel.
2. The liquid crystal display as defined in claim 1 , wherein, a number of the look-up table is one.
3. The liquid crystal display as defined in claim 2 , wherein, the target temperature is determined to be within a range between 48° C. and 63° C.
4. The liquid crystal display as defined in claim 1 , wherein, the look-up table is arranged so as to correspond to the target temperature.
5. The liquid crystal display as defined in claim 1 , wherein, the target temperature is determined to be within a range between 48° C. and 63° C.
6. The liquid crystal display as defined in claim 1 , wherein, the liquid crystal panel includes a liquid crystal cell in vertical align mode and is driven in normally black mode.
7. The liquid crystal display as defined in claim 1 , wherein, the heater control means controls start and stop of heating by the heater irrespective of ambient temperature.
8. The liquid crystal display as defined in claim 1 , wherein the heater control means comprises:
a plurality of temperature sensors, each of the plurality of temperature sensors being configured to sense the temperature of a separate section of the liquid crystal panel.
9. A liquid crystal display, comprising:
a memory storing, until a next time, current data indicating current brightness of each pixel provided in a liquid crystal panel;
a look-up table precedently storing (i) combinations of previous data and the current data, the combinations having possibilities to be inputted, and (ii) output signals corresponding to the respective combinations;
control means for outputting an output signal as corrected current data in order to facilitate grayscale transition from a previous time to a current time, by reading out, from the look-up table, data corresponding to a combination of previous data read out from the memory and current data, and outputting that data or that data after being interpolated, instead of the current data;
a heater heating the liquid crystal panel, the heater including a plurality of heater electrodes, each of the plurality of heater electrodes being formed as a linear band aligned to be in parallel with a side of the liquid crystal panel; and
heater control means for controlling the heater so as to either stop the heating by the heater when a sensed temperature of the liquid crystal panel exceeds a threshold value which is 1° C. through 1.5° C. higher than a target temperature, or start the heating by the heater when the sensed temperature of the liquid crystal panel goes below a threshold value which is 1° C. through 1.5° C. lower than the target temperature, the target temperature being determined in advance to be in a range between 33° C. and 63° C.; wherein
the sensed temperature of the liquid crystal panel is determined by sensing a temperature of a plurality of separate sections of the liquid crystal panel.
10. The liquid crystal display as defined in claim 9 , wherein, a number of the look-up table is one.
11. The liquid crystal display as defined in claim 10 , wherein, the target temperature is determined to be within a range between 48° C. and 63° C.
12. The liquid crystal display as defined in claim 9 , wherein, the look-up table is arranged so as to correspond to the target temperature.
13. The liquid crystal display as defined in claim 9 , wherein, the target temperature is determined to be within a range between 48° C. and 63° C.
14. The liquid crystal display as defined in claim 9 , wherein, the liquid crystal panel includes a liquid crystal cell in vertical align mode and is driven in normally black mode.
15. A liquid crystal display, comprising:
a memory storing, until a next time, current data indicating current brightness of each pixel provided in a liquid crystal panel;
a look-up table precedently storing (i) combinations of previous data and the current data, the combinations having possibilities to be inputted, and (ii) output signals corresponding to the respective combinations;
control means for outputting an output signal as corrected current data in order to facilitate grayscale transition from a previous time to a current time, by reading out, from the look-up table, data corresponding to a combination of previous data read out from the memory and current data, and outputting that data or that data after being interpolated, instead of the current data;
a heater heating the liquid crystal panel, the heater including a plurality of heater electrodes, each of the plurality of heater electrodes being formed as a linear band aligned to be in parallel with a side of the liquid crystal panel; and
heater control means for controlling start and stop of heating by the heater, in such a manner as to keep a difference between a sensed temperature of the liquid crystal panel and a target temperature to be not more than a predetermined threshold value, the target temperature being a temperature at which, by facilitating the grayscale transition by the control means, each pixel is virtually able to reach a desired grayscale level in every grayscale level transition,
the threshold value being set in such a manner as to keep a difference between a grayscale level at which a pixel reaches as a result of the grayscale level correction by the control means and a target grayscale level to be within an allowable range; wherein
the sensed temperature of the liquid crystal panel is determined by sensing a temperature of a plurality of separate sections of the liquid crystal panel.
16. The liquid crystal display as defined in claim 15 , wherein, a number of the look-up table is one.
17. The liquid crystal display as defined in claim 16 , wherein, the target temperature is determined to be within a range between 33° C. and 63° C.
18. The liquid crystal display as defined in claim 16 , wherein, the target temperature is determined to be within a range between 48° C. and 63° C.
19. The liquid crystal display as defined in claim 16 , wherein, the allowable range is such a range that an error between a target brightness and a brightness obtained as a result of the grayscale transition to the current time is not more than ±20%.
20. The liquid crystal display as defined in claim 15 , wherein, the look-up table is arranged so as to correspond to the target temperature.
21. The liquid crystal display as defined in claim 15 , wherein, the target temperature is determined to be within a range between 33° C. and 63° C.
22. The liquid crystal display as defined in claim 15 , wherein, the target temperature is determined to be within a range between 48° C. and 63° C.
23. The liquid crystal display as defined in claim 15 , wherein, the allowable range is such a range that an error between a target brightness and a brightness obtained as a result of the grayscale transition to the current time is not more than ±20%.
24. The liquid crystal display as defined in claim 15 , wherein, the liquid crystal panel includes a liquid crystal cell in vertical align mode and is driven in normally black mode.