Method for driving a reflection liquid crystal display wherein the liquid crystal display having particular cholesteric color filters
View Patent ↗A reflection liquid crystal display is such that a transparent substrate is opposed to the first substrate with a liquid crystal layer placed therebetween, and the transparent substrate is disposed forward to the first substrate in the light-incident direction. A quarter-wavelength plate is disposed in the transparent substrate, and a polarization plate is disposed on the surface at the forward side thereof in the light-incident direction. And, a reflection layer besides acting as a color filter consisting of a cholesteric liquid crystal is disposed inside liquid crystal cells of the first substrate. In the case of a wide field-of-view angle, a scattering film is disposed forward to the polarization plate in the light-incident direction.
1. A method for driving a reflection liquid crystal display comprising:
a first substrate;
a second transparent substrate that is disposed forward to the light-incident direction so that it is opposed to said first substrate;
a liquid crystal layer placed between said first and second substrates;
a color filtering layer consisting of a cholesteric material layer secured between said first substrate and said liquid crystal layer;
an optical absorbing layer provided rearward of said color filtering layer in the light-incident direction between said first substrate and said color filtering layer; and
a three-prime-color cholesteric material layer having an inverted twisting compared to said cholesteric material layer of said color filtering layer, said three-prime-color cholesteric material layer being provided at a side of said second substrate forward of said second substrate in said light-incident direction
wherein said display is dot invertedly driven by inverting the polarities (positive and negative) of voltage applied onto a liquid crystal layer of pixels adjacent to each other.
2. A method for driving a reflection liquid crystal display, said display comprising:
a first substrate;
a second transparent substrate that is disposed forward to the light-incident direction so that it is opposed to said first substrate;
a liquid crystal layer placed between said first and second substrates;
a color filtering layer consisting of a cholesteric material layer secured between said first substrate and said liquid crystal layer;
an optical absorbing layer provided rearward of said color filtering layer in the light-incident direction between said first substrate and said color filtering layer; and
a three-prime-color cholesteric material layer having an inverted twisting compared to said cholesteric material layer of said color filtering layer, said three-prime-color cholesteric material layer being provided at a side of said second substrate forward of said second substrate in said light-incident direction
wherein pixels are displayed to be black by changing voltage applied onto a liquid crystal layer before one frame is finished.