Voltage control for adjusting the brightness of a screen display
US6271813A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 30, 1996 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | Aug 30, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/58
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of controlling the brightness level of a screen display having a matrix of pixels that each have a brightness level controlled by a first and second voltage includes maintaining the first voltage of each pixel at a preselected voltage level. The second voltage level is controlled and adjusted depending on the ambient light conditions. The second voltage is increased during daytime conditions to increase the brightness of the screen display and decreased during nighttime conditions to decrease the brightness of the display. The ambient light conditions are determined by using a light-sensitive sensor or a manually adjustable control.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.