Image display device
US6791566B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 2002 |
| Grant date | Sep 14, 2004 |
| Priority date | — |
| Expiry date | May 21, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/70
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a display device according to a first aspect of the invention, luminance is not made substantially uniform over the entire display screen but rather imparted a luminance gradient such that luminance substantially monotonously decreases from the center of the screen towards the peripheral portion using a luminance gradient forming means, whereby power consumption is reduced compared to cases in which the entire screen shows substantially uniform luminance. In a second aspect of the invention, by optimizing gray level characteristics and thereby improving a viewer's impression of brightness, luminance gradient is made even less perceivable without increasing power consumption. These configurations provide large screen, low power consumption display devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.