LCD system having improved contrast ratio
US5124818A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1990 |
| Grant date | Jun 23, 1992 |
| Priority date | — |
| Expiry date | Aug 24, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2200/1612
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An LCD display system is formed by stacking two or more independently operated LCD elements. By exploiting the birefringent effect of STN nematic liquid crystals a full range of colors may be displayed. Display rows in the stacked panels are preferably interlaced to achieve high display resolution. Optics are desirably included to collimate light, illuminating the stacked elements, to reduce parallax effects and to disperse light exiting the stacked elements to permit wide angle viewing. The contrast between a pixel in the dark state and in the white state of the high resolution display system may be increased by modifying the .DELTA.nd product of the liquid crystal in the passive regions to compensate for the natural birefringence of the liquid crystal in optically aligned active regions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.