Backlight brightness control for liquid crystal display panel using a frequency-divided clock signal
US8749470B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 2007 |
| Grant date | Jun 10, 2014 |
| Priority date | — |
| Expiry date | Jul 28, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2360/16
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display device is provided with a display panel on which a plurality of display pixels are provided; a backlight illuminating the display panel; and a display panel driver driving the display panel. The display panel driver externally receiving image data and a clock signal for controlling timings of receiving the image data. The display panel driver includes a backlight controller generating a PWM-modulated drive signal to drive the backlight. The frequency of the PWM-modulated drive signal is dependent on a frequency-divided clock signal generated by frequency dividing of the clock signal externally received. The frequency-divided clock signal is generated so that the frequency of the PWM-modulated drive signal is kept constant when the frequency of the clock signal externally received is switched.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.