Transparent and spread illuminating apparatus
US6088074A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 25, 1999 |
| Grant date | Jul 11, 2000 |
| Priority date | — |
| Expiry date | Jan 25, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S385/901
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a transparent and spread illuminating apparatus closely disposed to cover a surface of a reflection type liquid-crystal display device, a transparent substrate 2 which covers an observation face F of a reflection type liquid crystal display element L is disposed, a light reflection pattern 11 is formed on a top surface 6 of the transparent substrate 2, the light reflection pattern 11 is formed of a plurality of recesses 12 formed at given intervals P1 in parallel with the axial direction of the light source lamp 4 disposed along one side end surface 3, in which assuming that intervals between stripes which are in parallel with the recesses 12 in the arrangement of liquid cells of the reflection type liquid-crystal display device L are P2, the intervals P1 are set to satisfy a relation between P1 and P2: PA1 Pl:P2=1:(N+1.3) to 1:(N+1.6) PA1 or PA1 P1:P2=1:1/(N+1.6) to 1:1/(N+1.3) where N is an integer: 0, 1, 2, 3, . . . . As a result, it is possible to suppress an interference caused by stripes with the interval P1 due to the light reflection pattern 11 and the stripes with intervals P2 due to the reflection type liquid crystal display element L to suppress the occurrence of the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.