Liquid crystal display and scanning back light driving method thereof
US8803925B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 23, 2011 |
| Grant date | Aug 12, 2014 |
| Priority date | — |
| Expiry date | Dec 26, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/064
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A liquid crystal display includes a scanning backlight controller, that calculates a turn-on duty ratio of a pulse width modulation (PWM) signal for controlling turn-on and turn-off operations of light sources, and a light source driver, that synchronizes a frequency of the PWM signal with a frame frequency or synchronizes the frequency of the PWM signal with the frame frequency, changes the calculated turn-on duty ratio of the PWM signal to a maximum value, and adjusts an amplitude of the PWM signal based on a changed degree of the turn-on duty ratio of the PWM signal, based on the result of a comparison between the turn-on duty ratio of the PWM signal and a previously determined critical value, and then sequentially drive the light sources along a data scanning direction of the liquid crystal display panel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.