Method for driving a liquid crystal display device
View Patent ↗When a new image is written to a liquid crystal panel, row electrodes are scanned a-line-at-a-time in time periods T p1 , T p2 , selected row electrodes are set at a voltage V r , and all column electrodes are set at −V c . The portions of a liquid crystal at the selected row electrodes have a voltage of V r +V c applied thereacross to bring the liquid crystal in the entire screen into a planar state. After the portions of the liquid crystal at all pixels have been brought into the planar state, new display is written by a-line-at-a-time scanning in time periods T d1 , T d2 .
1. A method for driving a liquid crystal display device including a memory type liquid crystal layer that exhibits at least two stable states, a plurality of common electrodes and a plurality of segment electrodes,
wherein the common electrodes are scanned so as to be selected a-line-at-a-time,
characterized in that
An, Bn and Wn being determined such that
L·(At·An+Bt·Bn+Wt·Wn) is not longer than a certain time period, and the voltage for making said layer into on-display being set higher than the voltage for making said layer into off-display;
where L is a total number of the common electrodes,
At (sec) is a selection time period for each of the common electrodes when the voltage making said layer into on-display is applied to said layer,
An is a scan number for applying the voltage for making said layer into on-display at least one time,
scanning the common electrodes so as to select all common electrodes on by one,
Bt (sec) is a selection time period for each of the common electrodes when the voltage for making said layer into off-display is applied so said layer,
Bn is a scan number for applying the voltage for making said layer into off-display,
Wt (sec) is a selection time period for each of the common electrodes when the voltage corresponding to a display data is applied to said layer, and
Wn is a scan number for applying the voltage corresponding to a display data to said layer,
an on-voltage to make said layer into on-display is set to be higher than an off-voltage to make said layer into off-display,
an on-voltage is applied to said layer, and
an off-voltage is applied to said layer, and
a voltage corresponding to a display data is applied to said layer.
2. The method for driving a liquid crystal display device according to claim 1 ,
wherein L·(At·An+Bt·Bn+Wt·Wn) is less than or equal to 60 seconds.
3. The method for driving a liquid crystal display device according to claim 1 ,
wherein At=Bt=Wt is satisfied.
4. The method for driving a liquid crystal display device according to claim 1 ,
wherein An=Bn=Wn is satisfied.
5. The method for driving a liquid crystal display device according to claim 1 ,
wherein Bn=0 is satisfied and off-voltage is not applied to said layer.
6. The method for driving a liquid crystal display device according to claim 1 ,
wherein Bn=0 and An=Wn are satisfied.
7. The method for driving a liquid crystal display device according to claim 1 ,
wherein At≧Wt is satisfied.
8. The method for driving a liquid crystal display device according to claim 1 ,
wherein At≧1.2Wt is satisfied.
9. The method for driving a liquid crystal display device according to claim 1 ,
wherein At≧1.5Wt is satisfied.
10. The method for driving a liquid crystal display device according to claim 1 ,
wherein Wn is 1.
11. The method for driving a liquid crystal display device according to claim 1 ,
wherein Wn is 2.
12. The method for driving a liquid crystal display device according to claim 1 ,
wherein An is 2 and Bn is 0 and Wn is 2.
13. The method for driving a liquid crystal display device according to claim 1 ,
wherein An is 1 and Bn is 1 and Wn is 1.
14. The method for driving a liquid crystal display device according to claim 1 ,
wherein An is 4 and Bn is 2 and Wn is 4.
15. The method for driving a liquid crystal display device according to claim 1 ,
wherein An is 1 and Bn is 0 and Wn is 2.
16. The method for driving a liquid crystal display device according to claim 1 ,
wherein An is 0 and Bn is 0 and Wn is from 4 to 16.
17. The method for driving a liquid crystal display device according to claim 1 ,
wherein said layer is comprised of a chiral nematic liquid crystal material.
18. The method for driving a liquid crystal display device according to claim 1 ,
wherein an visible wavelength is included in a selective-reflective region by said layer in planar state.
19. The method for driving a liquid crystal display device according to claim 1 ,
wherein an infrared wavelength is included in a selective-reflective region by said layer in a planar state.
20. The method for driving a liquid crystal display device according to claim 1 ,
wherein an ultraviolet wavelength is included in a selective-reflective region by said layer in a planar state.