Image processing circuit and image processing method

An image processing and circuit technology, applied in image communication, television, electrical components, etc., can solve problems such as inability to apply liquid crystals, white or black image data, etc., and achieve the effect of suppressing the decrease in contrast

Inactive Publication Date: 2007-01-31
MITSUBISHI ELECTRIC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the maximum or minimum gray scale is usually set on the white image data or black image data, no higher or lower voltage can be applied to the liquid crystal.
That is, in the conventional overdrive processing, there is a problem that although it is applicable to the image data of intermediate gray scale, it cannot be applied to the image data of white or black.

Method used

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  • Image processing circuit and image processing method
  • Image processing circuit and image processing method

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Embodiment 1

[0020] A liquid crystal display is a display that controls transmitted light or reflected light and displays images by applying voltage to liquid crystals and controlling the alignment of liquid crystal molecules. Liquid crystal displays can be classified into two types: normal white and normal black. First, if figure 1 As shown, in the case of normal white, the lowest voltage is set to the voltage applied to the liquid crystal during white display (hereinafter referred to as white voltage), and the highest voltage is set to the voltage applied to liquid crystal during black display (hereinafter referred to as white voltage for short). black voltage). That is, in a normally white liquid crystal display, a state where no voltage is applied is white display.

[0021] On the other hand, although not shown, in the case of normal black, the lowest voltage is set as the black voltage, and the highest voltage is set as the white voltage. That is, in a normally black liquid crystal...

Embodiment 2

[0047] Figure 5 A block diagram of the image processing circuit of this embodiment is shown. Figure 5 The image processing circuit shown in the Figure 4 The illustrated image processing circuit is configured by adding a gamma correction control circuit 4 which is a gamma correction control unit and a gamma generation circuit 5 which is a gamma generation unit.

[0048] In liquid crystal displays, the display brightness does not increase proportionally with the increase of the applied voltage, but the display brightness increases in a curve. The method of correcting the relationship between the applied voltage and the display brightness is gamma correction. However, as shown in Embodiment 1, when image data is compressed, the data compression rate affects gamma correction.

[0049] Therefore, in the image processing circuit of this embodiment, the gamma correction control circuit 4 is provided to control the gamma generation circuit 5 that performs gamma correction in con...

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Abstract

The present invention provides an image processing circuit capable of performing overdrive processing on all gray-scale while suppressing the degradation of the contrast of a liquid crystal display. According to the present invention, an image processing circuit for a liquid crystal display performing overdrive processing includes a data compression circuit for compressing the gray-scale of image data in the direction of medium gray-scale with a predetermined data compression ratio and outputting compressed data, an FRC processing circuit for performing pseudo-gray-scale processing on the compressed data and outputting pseudo-gray-scale image data having the same number of gray-scale as the number of gray-scale of the image data and an overdrive processing circuit for setting the voltage difference between the highest gray-scale and the lowest gray-scale of the pseudo-gray-scale image data to be greater than the voltage difference between the highest gray-scale and the lowest gray-scale of the compressed data, assigning a new voltage in the region of the gray-scale difference between the image data and the compressed data and utilizing the new voltage for overdriving processing.

Description

technical field [0001] The invention relates to an image processing circuit and an image processing method, in particular to an image processing circuit and an image processing method for a liquid crystal display. Background technique [0002] In recent years, liquid crystal displays have been used in various fields, and they are also used in TV applications in addition to PC monitors. However, since the response speed of the liquid crystal display is slow, there is a problem that the display quality deteriorates due to the generation of afterimages in the display mainly of animations such as TV applications. Therefore, in a liquid crystal display, an overdrive processing method is adopted to improve a response speed. Overdrive processing refers to that when the image data is animation, if the data change direction from the previous frame to the current frame is positive, the voltage applied to the liquid crystal is higher than the usual occasion, if the data change directi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/202
CPCG09G2340/16G09G2320/0252G09G3/2018G09G3/3611G09G2320/0276G09G2320/0271G02F1/133
Inventor 大浦久治
Owner MITSUBISHI ELECTRIC CORP
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