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Color liquid crystal display and gamma correction method for the same

A liquid crystal display device, gamma correction technology, applied in static indicators, nonlinear optics, instruments, etc., can solve the problem of not getting color reproducibility, and achieve the effect of improving viewing angle dependence

Active Publication Date: 2008-10-29
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This means that good color reproduction is not obtained when viewing the screen from an oblique angle

Method used

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  • Color liquid crystal display and gamma correction method for the same
  • Color liquid crystal display and gamma correction method for the same
  • Color liquid crystal display and gamma correction method for the same

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Experimental program
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Embodiment approach 1

[0071] 1.1 The overall composition of the liquid crystal display device

[0072] FIG. 1 is a block diagram showing the overall configuration of an active matrix liquid crystal display device according to Embodiment 1 of the present invention. This liquid crystal display device is equipped with a display control circuit 200, including a data signal line driving circuit (also called "source driver") 300, a scanning signal line driving circuit (also called "gate driver") 400, and a common electrode driving circuit ( Not shown), the pixel electrode driving circuit, the auxiliary electrode driving circuit 600, and the display unit 500. The display unit 500 includes a plurality (m) of data signal lines S(1) to S(m), a plurality (n) of scanning signal lines G(1) to G(n), and A plurality of (m×n) pixel forming sections provided at intersections of m) data signal lines S(1) to S(m) and a plurality of (n) scanning signal lines S(1) to S(n) . These pixel forming sections include three...

Embodiment approach 2

[0128] In the first embodiment described above, by shifting the chromaticity of the oblique hue correction area (color unbalanced area) IL in the half-tone area toward the blue direction when viewed from the front, the oblique hue correction area IL is reduced in the oblique direction. The chromaticity when observed is shifted toward the yellow direction, thereby improving the color reproducibility when observed obliquely. However, as shown in FIG. 11(A), when changing the gradation value from 255 to 0, the amount of chromaticity shift away from the state of maintaining the color balance is bounded by the predetermined gradation value of the intermediate gradation area, from the increasing state to 0. Switch to reduced state. That is, in the interval where the grayscale value is greater than the specified grayscale value, as the grayscale value decreases, the chromaticity shifts toward the blue direction (negative direction), but when the grayscale value is smaller than the sp...

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Abstract

A color liquid crystal display is provided where the viewing angle dependence of the gamma characteristic is improved by employing a pixel division method and display with high color reproducibility can be achieved when the screen is viewed not only front the front but also at an angle. By referring to the correction tables for R, G, and B, the following gamma correction is performed independently for R, G, and B to achieve good color tracking. The chromaticity of the front view shifts toward blue in an oblique hue correction range (IL) defined according to the pixel division ratio etc. to reduce the shift of the chromaticity of an oblique view toward yellow in the oblique hue correction range (IL) while the color balance in the other ranges (the gray scale level from 32 to 255 excluding the oblique hue correction range) is maintained. This invention is suitable for a pixel-division color liquid crystal display.

Description

technical field [0001] The present invention relates to a color liquid crystal display device in which each pixel of an image is composed of a predetermined number of two or more sub-pixels obtained by spatially or temporally dividing one pixel. More specifically, the present invention relates to improving the color reproducibility of such a color liquid crystal display device. Background technique [0002] In a display device, in order to reproduce an image represented by a video signal supplied as an input signal from the outside as a display image satisfactorily, the gradation value etc. represented by the input signal is usually corrected to adjust the gradation value represented by the input signal and the actual display value. The relationship between the brightness of the image. Such correction is called "gamma correction". [0003] A liquid crystal display device displays an image indicated by an input signal by controlling a voltage applied to the liquid crystal a...

Claims

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Application Information

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IPC IPC(8): G09G3/36G02F1/133G09G3/20
CPCG02F2001/134345G09G2300/0443G09G2300/0439G09G3/3648G09G2300/0452G09G2320/0242G02F2001/134354G09G2320/028G09G2320/0673G09G2320/0285G09G2320/0276G02F1/134345G02F1/134354
Inventor 入江健太郎下敷领文一
Owner SHARP KK
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