Shutter glass drive scheme for sequential-color displays
View Patent ↗A method for driving at least one shutter glass lens having a property of light retardation that is variable at least according to the wavelength of the light passing through it, the shutter glass lens having an LC cell driven to a relatively “on” or a relatively “off” state according to a voltage applied across it. The lens is further operable to pass temporally modulated color display images of at least first, second, and third wavelengths being applied to a display surface, further including first, second, and third holding voltages to the LC cell in decreasing magnitude to stabilize the retardation of the lens for first, second, and third display image wavelengths.
1. A method for driving at least one shutter glass lens having a property of light retardation that is variable at least according to the wavelength of the light passing through it, the shutter glass lens having an LC cell driven to a relatively “on” or a relatively “off” state according to a voltage applied across it, the lens operable to pass temporally modulated color display images of at least first, second, and third wavelengths being applied to a display surface, the method comprising:
a) applying a first holding voltage to the LC cell to stabilize the retardation of the lens for the first wavelength;
b) providing a first temporally modulated color display image on the display surface after applying the first holding voltage;
c) applying a second holding voltage to the LC cell to stabilize the retardation of the lens for the second wavelength;
d) providing a second temporally modulated color display image on the display surface after applying the second holding voltage;
e) applying a third holding voltage to the LC cell to stabilize the retardation of value for the third wavelength;
f) providing a third temporally modulated color display image on the display surface after applying the third holding voltage; and
g) between applying the holding voltages, removing voltage from the LC cell;
wherein the removing voltage and the applying the first, second, and third holding voltages occur during the relatively “on” state.
2. The method according to claim 1 , wherein the above process begins from a starting point of the shutter lens being in an “off” state with the LC cell having a voltage applied to it that is greater than all of the first, second, and third holding voltages.
3. The method according to claim 2 , wherein the first, second, and third holding voltages have sequentially decreasing magnitudes.
4. The method according to claim 1 wherein the first wavelength is blue, the second wavelength is green, and the third wavelength is red.