Liquid crystal display, surface light source device and light control sheet
US7432999B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 1, 2000 |
| Grant date | Oct 7, 2008 |
| Priority date | — |
| Expiry date | Dec 1, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133607
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A fluorescent lamp 6 emits illumination light (primary light), which is deflected by means of a light guide plate 4 to be converted into a light flux having an enlarged cross section. A liquid crystal display panel 3 is supplied with the light flux via a prism sheet (light control sheet) 12. The prism sheet 12 or an alternative light control sheet to be employed is capable of rotating polarization involved by the light toward a direction of light transmission axis of a polarization plate 14. An effective light input to the liquid crystal display panel 3 is achieved by light transmission through the polarization plate 14 at a high transmission rate. The liquid crystal display panel 3 controls polarization state of the inputted light and, according to the state, causes the light to pass through another polarization plate (analyser) 15. Emission occurs, under intensity control depending on positions, via the polarization plate (analyzer) 15, to provide an image. Polarization rotation function for modifying the emission of the light guide plate 4 can be obtained through manufacturing of a mother material of the prism sheet 12 by means of one-axle drawing process or two-axle drawing pro…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.