Invention Application
- Patent Title: SELF-COMPENSATING, QUASI-HOMEOTROPIC LIQUID CRYSTAL DEVICE
- Patent Title (中): 自补偿,准单色液晶装置
-
Application No.: PCT/US2007074492Application Date: 2007-07-26
-
Publication No.: WO2008019227A2Publication Date: 2008-02-14
- Inventor: SCHEFFER TERRY J , XUE JIUZHI
- Applicant: CUSPATE LLC , SCHEFFER TERRY J , XUE JIUZHI
- Assignee: CUSPATE LLC,SCHEFFER TERRY J,XUE JIUZHI
- Current Assignee: CUSPATE LLC,SCHEFFER TERRY J,XUE JIUZHI
- Priority: US83558606 2006-08-03
- Main IPC: G02F1/1337
- IPC: G02F1/1337
Abstract:
Self-compensating, quasi-homeotropic liquid crystal devices (100, 200, 300, 400) overcome the contrast reducing effects of smaller pretilt angles. The devices exhibit extremely high contrast ratio but at the same time suppress fringe field-induced disclination lines in high pixel density and small pixel size quasi-homeotropic displays. The surface pretilt (520, 540) and cell twist (570) angles are set at values that, in combination, contribute to establishing a cuspate singularity in the contrast ratio for normally incident light in response to a drive signal switching the liquid crystal device to the OFF director field state that provides nearly 0% optical efficiency. The OFF director field state corresponds to a subthreshold drive level that provides for the liquid crystal device self-compensation for in plane optical retardation. Setting the cell gap ("d") to provide substantially 100% optical efficiency in response to a value of the drive signal switching the liquid crystal device to the ON director field state achieves optimal dynamic range for the liquid crystal device.
Information query
IPC分类: