Scattering fringe field optical-compensated reflective and transflective liquid crystal display
AssigneePrime View International Co., Ltd.
InventorHong-Da Liu
Life of this patent
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Abstract
In a reflective or transflective LCD comprising a TFT plate and a color filter plate with a LC layer of negative dielectric anisotropy inserted therebetween, a pixel electrode and a common electrode consisting of a plurality of strips are provides on the TFT plate to produce a fringe field applied on the LC layer for a phase difference that is compensated by a compensator. A scattering film is introduced in the LCD to enhance the brightness. A polarizer is arranged with its polarization direction at an angle from the extension axis of the compensator.
Claims17
A scattering fringe field optical-compensated reflective liquid crystal display comprising:
- a TFT plate;
- a color filter plate;
- a liquid crystal layer of a negative dielectric anisotropy sandwiched between said TFT plate and color filter plate, said liquid crystal layer having an ordinary and extraordinary refractive index n0 and ne, a cell gap g and a rubbing direction;
- a reflective electrode structure on said TFT plate for applying a fringe field to said liquid crystal layer, said reflective electrode structure including a common electrode and a pixel electrode with an insulator therebetween, said common electrode consisting of a plurality of strips;
- a scattering film between said liquid crystal layer and color filter plate;
- a compensator on said color filter plate, said compensator having a thickness t, an extension axis and respective refractive index nx, ny and nz in three axes;
- and
- a polarizer with a polarization direction arranged outside said color filter plate, said polarization direction having an angle φR from said extension axis and an angle φLC from said rubbing direction;
- wherein θLC=(ne−no)×g and R=(nx−(ny+nz)/2)×t, and said liquid crystal layer, compensator and polarizer are arranged under a condition of |θLC−2R|≦30 nm and 85°≦|φR−φLC |≦95°, or |2θLC−R|≦30 nm, 40°≦(φLC−2φR)≦50° and |φR−14°|≦8°.
A scattering fringe field optical-compensated transflective liquid crystal display comprising:
- a TFT plate;
- a color filter plate;
- a liquid crystal layer of a negative dielectric anisotropy sandwiched between said TFT plate and color filter plate, said liquid crystal layer having an ordinary and extraordinary refractive index no and ne, a cell gap g and a rubbing direction;
- a transflective electrode structure on said TFT plate for applying a fringe field to said liquid crystal layer, said transflective electrode structure including a common electrode and a pixel electrode with an insulator therebetween, said common electrode consisting of a plurality of strips;
- a scattering film between said liquid crystal layer and color filter plate;
- a front compensator on said color filter plate, said front compensator having a thickness tf, a first extension axis and respective refractive index nfx, nfy and nfz in three axes;
- a rear compensator on said TFT plate, said rear compensator having a thickness tr, a second extension axis and respective refractive index nrx, nry and nrz in three axes;
- and
- a front polarizer with a first polarization direction arranged outside said color filter plate, said first polarization direction having an angle φRf from said first extension axis and an angle φLC from said rubbing direction;
- and
- a rear polarizer arranged outside said TFT plate, said rear polarizer having a second polarization direction parallel to said first polarization direction;
- wherein θLC=(ne−no)×g and Rf=(nfx−(nfy+nfz)/2)×tf, and said liquid crystal layer, front compensator and front polarizer are arranged under a condition of |θLC−2Rf|≦30 nm and 85°≦|φRf−φLC|≦95°, or |2θLC−Rf|≦30 nm, 40°≦(φLC−2φRf)≦50° and |φRf−14°|≦8°.
Dependencies are inferred from the claim text.