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LCD, liquid crystal display device, and their drive method

A technology of a liquid crystal display device and a driving method, which is applied to static indicators, parts of color TVs, parts of TV systems, etc., can solve the problems of lowering of image display quality and lowering of response speed, etc.

Inactive Publication Date: 2008-08-27
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the optimal LUT-ROM 51 for overshoot driving an LCD having characteristic C of response speed is used as it is for LCD 56 having characteristic D of response speed, one of the following problems occurs in LCD 56: (i) Image display of LCD 56 Reduced quality; (ii) LCD56 is less responsive than when using the best LUT-ROM in this LCD56's overshoot drive

Method used

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  • LCD, liquid crystal display device, and their drive method
  • LCD, liquid crystal display device, and their drive method
  • LCD, liquid crystal display device, and their drive method

Examples

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Embodiment approach 1

[0043] An embodiment of the present invention is described with the drawings.

[0044] FIG. 1 is a block diagram showing a schematic configuration of a liquid crystal display device according to this embodiment.

[0045] This liquid crystal display device performs so-called overshoot driving. Here, "overshoot driving" refers to a driving method in which an excessive signal voltage is applied to the liquid crystal cell for a short period of time. This overshoot driving accelerates the change of the molecular arrangement of the liquid crystal material and improves the performance of moving images.

[0046] The liquid crystal display device of this embodiment includes an LCD (liquid crystal display; LCD module) 1 and an external signal source 2 as shown in the figure.

[0047] The LCD1 is equipped with: an active matrix type liquid crystal panel (display panel) 3 having a thin film transistor (TFT) as a switching element, a driver (source driver, gate driver, not shown) for driv...

Embodiment approach 2

[0080] Another embodiment of the present invention will be described with reference to FIGS. 8 and 9 . In this embodiment, differences from Embodiment 1 will be described, and therefore members having the same functions as those described in Embodiment 1 will be given the same reference numerals and their descriptions will be omitted for convenience of description.

[0081] Figure 8 (a) part is a diagram showing the schematic composition of the LCD as a reference example, and Figure 8 (b) part is a diagram showing the EEPROM (electrically erasable / programmable read only memory: electrically erasable / programmable read only memory) shown in Figure 8 (a) part A schematic diagram of the data area of ​​the programming read-only memory). In recent years, there have been more and more cases where EEPROM is mounted and used for potential adjustment of electrode pairs of modules.

[0082] An LCD 20 as a reference example is provided with a liquid crystal panel 23, an FPC 24, and an EE...

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Abstract

A liquid crystal display device includes an LCD (1) having a liquid crystal panel (3) for displaying an image, a lookup table, and a frame memory (8) arranged outside the LCD (1) and performs overshoot drive. In the liquid crystal device, third gradation data optimal for overshoot drive of the LCD (1) is calculated from first gradation data in a first frame and second gradation data in a second frame preceding, by one frame, the first frame and stored in the frame memory (8) in advance, by using the lookup table. The data in the lookup table is characterized in that it is recorded for each of the characteristics of the response speed of the LCD (1). Accordingly, it is possible to provide a liquid crystal display device having a high display quality without rewriting the data in the lookup table and maintaining a lookup table optimal for overshoot.

Description

technical field [0001] The invention relates to a liquid crystal display device and a driving method thereof for overshoot driving by using a look-up table. Background technique [0002] In recent years, flat panel displays (Flat Panel Display: FPD) have been greatly improved, and cathode ray display tube monitors are being replaced by various FPDs. Liquid Crystal Display (LCD), which is a pioneer of FPD, has achieved remarkable technical progress, and has been used in various places in daily life, and expectations for its further development are rising. [0003] However, LCDs still have several major weaknesses. One of its representative weaknesses is that the display of moving images is difficult to deal with. One of the main reasons: the response speed of liquid crystal is slow. When it comes to liquid crystal response speed, the switching speed of black and white is mostly considered. However, with the replacement of the above-mentioned cathode ray tube monitor, the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G02F1/133G09G3/20H04N5/66
CPCG09G3/3648G09G2320/0252G09G2320/0285G09G2340/16
Inventor 中川清志柳俊洋大和朝日川岛由纪高桥浩三
Owner SHARP KK