Liquid display
US6567060B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 13, 2000 |
| Grant date | May 20, 2003 |
| Priority date | — |
| Expiry date | Apr 13, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2201/343
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A printed layer having opening portions is provided at a position opposite to an observer of a liquid crystal display device, a display is performed by use of absorption or chromaticity of the printed layer when an external light source is utilized, and a display is performed by transmitting light through the opening portions of the printed layer when an auxiliary light source is turned on, and further different voltages between when the external light source is utilized and when the auxiliary light source is used are applied to a liquid crystal layer by a gradation reversal circuit. Moreover, reversal of brightness and darkness of a display by the use of the external light source and the auxiliary light source is eliminated by a polarizing film or a cholesteric liquid crystal polymer film disposed on the rear face of the liquid crystal display device, thereby enabling a liquid crystal display device with excellent visibility.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.