Liquid crystal display device

• US 20020047821A1
• Filed: 08/16/2001
• Published: 04/25/2002
• Est. Priority Date: 08/18/2000
• Status: Active Grant

• Current Assignee: Trivale Technologies, LLC (Vector Capital Corporation)
• Original Assignee: Kabushiki Kaisha Advanced Display
• Inventors: Miyake, Shiro
• Granted Patent: US 6,747,621 B2
• Time in Patent Office: Days
• US Class Current: 345/87
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/0633 by amplitude modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/3685 Details of drivers for data electrodes
• CPC Class Codes: G09G 5/36 characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory

Abstract

The invention relates to a liquid crystal display device, comprising a memory that delays a current display data supplied to a liquid crystal panel by one display period, and a reference table memory that holds a reference data containing multiple reference values determined by the current display data and a delayed displayed data. Here, the reference table memory has a compensation signal data written in advance, which substantially completes an optical response of the liquid crystal panel within the one display period. The liquid crystal display device supplies the inputted display data after having been converted always into a compensated signal level data to the liquid crystal panel, thus achieving a high-speed response that is completed within the one display period.

Claims

1. A liquid crystal display device comprising:

a delay circuit that delays an inputted current display data by one display period and outputs a delayed display data;

a reference unit that possesses a reference data containing a plurality of reference values corresponding to both the current display data and the delayed display data, and outputs an output data based on a reference value selected from a plurality of the reference values; and

a liquid crystal panel that receives a supply of video signals on the basis of the output data, wherein

the reference value selected when the current display data changes from the delayed display data is set so that an optical response of the liquid crystal panel in relation to the change is substantially completed within the one display period.

2. A liquid crystal display device as claimed in claim 1, wherein the level of the output data is compressed by a specific depth in such a manner that the level of the output data when the delayed display data and the current display data have the same value becomes lower than the level of the current display data, and the reference value selected when the current display data becomes higher than the delayed display data is set to expand the output data within the specific depth.

3. A liquid crystal display device as claimed in claim 1, wherein the level of the output data is compressed by a specific depth in such a manner that the level of the output data when the delayed display data and the current display data have the same value becomes lower than the level of the current display data, and a lowering of a luminance of the liquid crystal panel based on the compression of the output data is compensated by raising the luminance of a backlighting of the liquid crystal panel.