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Image display control device

An image display and control device technology, applied in image enhancement, image communication, image data processing, etc., can solve the problems of increased circuit occupation area, decreased image quality, damaged image chroma, etc., and achieves low power consumption, The effect of suppressing the reduction of chromaticity and enhancing the brightness

Inactive Publication Date: 2008-05-14
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] When a plurality of dedicated hardware is used to perform prescribed calculations in parallel, although fastness (real-time performance) can be ensured, the occupied area of ​​the circuit increases, and at the same time, the power consumption of the circuit also increases.
[0008] In addition, in the above-mentioned Patent Document 1, although only the correction of brightness is considered in the image correction for compensating for the degradation of image quality caused by the dimming of the illumination, the chromaticity of the image is damaged due to the dimming of the illumination. (The vividness of the color), the image quality is greatly reduced, so it is necessary to consider not only the brightness but also the chromaticity of the image correction
[0009] In addition, if control is performed to adaptively determine the dimming amount of the illumination in accordance with the brightness of the displayed image, when the brightness of the displayed image changes rapidly, the illumination brightness may change rapidly accordingly, causing flickering, resulting in degradation of the image quality of the displayed image.

Method used

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Examples

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no. 1 example

[0094] (Installation form of the image display control unit)

[0095] FIG. 6(A) to FIG. 6(D) are block diagrams for explaining the installation form of the image display device of the present invention, respectively.

[0096] In FIG. 6(A), an image display control device (image display control LSI) is incorporated in a mobile phone terminal (an example of electronic equipment) 100 . The mobile phone terminal 100 includes an antenna AN, a communication / image processing unit 102, a CCD camera 104, a host computer 106, an image display control device (image display control LSI) 108, a driver 110 (including a panel driver 112 and a backlight driver 114), a display Panel (eg, Liquid Crystal Panel (LCD)) 116, Backlight (LED) 118.

[0097] In FIG. 6(B), an image display control device (image display control LSI) 108 is installed in the drive device (driver) 110 itself, and an image is input from the host computer 106 to the image display control device (image display control LSI) 10...

no. 2 example

[0119] Next, the procedure for creating the code table shown in FIG. 10 will be described. Fig. 10 is a schematic diagram of the steps of making a code table.

[0120] In FIG. 10 , first, according to the displayed image, the backlight for image display is adaptively dimmed, and an algorithm (enhanced computing algorithm) based on a programming language (for example, a high-level programming language) is prepared (step S500), wherein , a programming language used to correct the image signal to compensate for the degradation of image quality caused by backlight dimming.

[0121] Then, the algorithm created in the programming language is converted together to generate microcode (step S502).

[0122] Next, the generated microcode is written into ROM (read-only memory) (step S503).

[0123] In this way, the code table 216 can be made efficiently. In addition, by changing the algorithm (microcode), it is possible to relatively easily change the calculation content of the common ...

no. 3 example

[0125] In this embodiment, the internal specific structure of the histogram creation part (statistical information acquisition part) 212 shown in FIG. 9 is demonstrated.

[0126] As described above, in the image display control device of the present invention, the statistical values ​​related to the luminance and chromaticity of the image signal of one frame are obtained, and based on the statistical values, the backlight luminance and the image signal (chromaticity and luminance) are automatically calculated. Adaptive correction. Also, as described above, when image correction is performed, even if the average luminance is low and the average chromaticity is high, the chromaticity is prioritized over power saving, and correction is performed to limit the dimming rate of the backlight. In order to perform such control, it is necessary to quickly obtain the required statistical value information of brightness and chromaticity.

[0127] FIG. 11 is a circuit diagram showing a de...

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Abstract

The invention provides an image display control device, which has the functions of rapidity (real-time performance), low power consumption and circuit scale increasing control, meanwhile, the image display control device can realize the adaptive light attenuation for lighting, and have high precise image correction technology to compensate the image quality worsening due to the light attenuation. The common arithmetic unit(218) is used for calculating the lighting brightness after the light attenuation and the correction coefficient for correctingimage. The common arithmetic unit(218) is regulated with the microcode memorized in the code table(216). In the image correction, the chroma correction is intensified, the chroma reduction causing by the light attenuation is controlled and the flash is prevented with tandem recursive IIR microwave processing. In addition, even the image has low average brightness and high chroma, the light attenuation of lighting is capable of being restricted and the reduction of chroma is able to be controlled.

Description

technical field [0001] The present invention relates to an image display control device and the like. In particular, it relates to an image display control device (image display control LSI) etc. which adaptively dims the brightness of display illumination according to a displayed image and corrects an image signal to compensate for the degradation of image quality caused by the dimming. Background technique [0002] Patent Document 1 discloses a technique of reducing the amount of light emitted from a backlight for power saving and adjusting image data so that the transmittance of a liquid crystal display screen can be increased as much as possible. [0003] Furthermore, Patent Document 2 describes an image correction device that uses a look-up table (LUT) to correct a luminance signal of a displayed image. [0004] Patent Document 1: Japanese Patent Application Laid-Open No. 11-65531 [0005] Patent Document 2: Japanese Patent Laid-Open No. 2004-310671 [0006] In order...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34G09G3/36G09G5/02G09G5/10G09G5/36G06T5/00H04N1/40G09G3/20H04N5/66
CPCG09G3/3607G09G2320/0247G09G2320/0626H04B1/40
Inventor 山本武邦森贤次
Owner SEIKO EPSON CORP
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