Gamma correction circuit, display panel, and display having them

A technology of gamma correction and display screen, which is applied in the field of gamma correction circuit and display screen, and can solve the problems of bluish overall image, backlight or color filter characteristic deviation, etc.

Inactive Publication Date: 2007-04-25
ROHM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when manufacturing a display screen, if the color is out of balance due to the characteristic shift of the backlight or the color filter, etc., only a slight shift to a specific color may cause the overall image to turn bluish, for example.

Method used

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  • Gamma correction circuit, display panel, and display having them
  • Gamma correction circuit, display panel, and display having them
  • Gamma correction circuit, display panel, and display having them

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Embodiment Construction

[0022]

Next, referring to the accompanying drawings, the best embodiment of the present invention will be described. FIG. 1 is a circuit diagram of a liquid crystal display device 1 according to a preferred embodiment of the present invention. This liquid crystal display device 1 includes: outputting the gamma correction setting voltage VI in order to correct the image voltage according to the nonlinear relationship between the applied voltage and the luminance of the liquid crystal display element. 1 ~VI m The gamma correction circuit 5a of; Output the image data Di of n bits (for example 8 bits), select the gamma correction setting voltage VI corresponding thereto 1 ~VI m Or their interpolation voltage, so that the corrected image voltage Vo is used as an external voltage, according to its source line, to the source driver 6 output by the display screen 7 described later; the display of the display element with a colored liquid crystal screen 7; a gate driver 8 for driv...

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PUM

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Abstract

A display having a display panel the color balance of which can be adjusted. The display (1) comprises a gamma correcting circuit (5a) including a gamma data output circuit (11a) for outputting gamma correction data for each color of RGB, registers (121 to 12m) receiving and holding the gamma correction data, and D/A converters (DAC) (131 to 13m) for converting the data in the registers (121 to 12m) into analog voltages and outputting gamma correction setting voltages VI1 to VIm, a source driver (6) receiving image data, selecting gamma correction setting voltages or their interpolation voltages in accordance with the image data, and thereby outputting a corrected image voltage, and a display panel (7) in which gate lines are connected to display elements each displaying one color are driven by a gate driver (8) and the corrected image voltage from the source driver (6) is inputted into a source line.

Description

technical field [0001] The invention relates to a gamma correction circuit and a display screen. In addition, it relates to a display device such as a liquid crystal display device including a gamma correction circuit and a display panel. Background technique [0002] In general, in a display panel of a display device such as a liquid crystal display device, there is a non-linear correlation, that is, a gamma characteristic, between an applied voltage to a display element and luminance. Fig. 5 shows general gamma characteristics. Curve A, the solid line in Figure 5, is the uncorrected (gamma corrected) picture voltage (eg V 1 or V m ), which is taken as the characteristic of the liquid crystal display element (that is, the gamma characteristic) when the voltage is applied. In this figure, the horizontal axis is the applied voltage, and the vertical axis is the relative brightness (that is, the light transmittance of the liquid crystal). Now, assume that the image vo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/20G09G3/36G02F1/133H04N5/202H04N5/66
CPCG09G3/20G02F1/133H04N5/66G09G3/36H04N5/202
Inventor 中田健一
Owner ROHM CO LTD
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