Lamp driving apparatus for liquid crystal display device having high contrast ratio
US8570269B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2007 |
| Grant date | Oct 29, 2013 |
| Priority date | — |
| Expiry date | Nov 11, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/066
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is a technology for implementing a high contrast ratio that cannot be implemented by only an analog dimming or burst dimming method, by selectively turning off lamps on the LCD device, comprising: a control unit outputting control signals and video data for controlling a driving of a gate driving unit and a data driving unit, and brightness control signals; the gate driving unit for supplying scan signals to gate lines on a liquid crystal panel by controlling of the control unit and the data driving unit for supplying a data voltage to data lines; the liquid crystal panel having liquid crystal cells arranged in a matrix type and thin film transistors formed at each intersection between the data lines and the gate lines; a backlight driving unit for controlling an optical amount by controlling a tube current supplied to lamps on a backlight unit and for selectively turning off the lamps when the brightness control signals are inputted; and the backlight unit for implementing a high brightness with respect to a dark area by irradiating a backlight having a brightness corresponding to light from the lamps emitted by the backlight driving unit toward the liquid crystal panel,…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.