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Image display apparatus and image display method

An image display device and image display technology, applied in image communication, static indicators, cathode ray tube indicators, etc., can solve the problems of image quality degradation, increased flicker, flicker reduction, etc.

Inactive Publication Date: 2011-06-08
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, reducing the brightness of the interpolated frame image increases the flickering
Therefore, the degradation of image quality has a trade-off relationship with the reduction of flicker
Especially on large-screen display devices, the brightness difference around the screen perimeter is perceived as strong flicker and becomes a serious problem

Method used

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  • Image display apparatus and image display method

Examples

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no. 1 example

[0023] The first embodiment will describe an image display device that displays a moving image conforming to the HDTV broadcasting system (1920 horizontal pixels×1080 vertical pixels) in Japan and the United States. However, as is apparent from the following description, the gist of the following description is not limited to the display of moving images in this manner, and is also applicable to display of moving images in other manners.

[0024] In the first embodiment, a frame image and sub-frame images generated from the frame image are alternately displayed on the display screen. At this time, the frame image is displayed by setting higher luminance values ​​to pixels closer to the center of the display screen and setting lower luminance values ​​to pixels closer to the periphery of the display screen. The sub-frame image is displayed by setting lower luminance values ​​for pixels closer to the center of the display screen and setting higher luminance values ​​for pixels c...

no. 2 example

[0067] In the second embodiment, when an image signal having a uniform luminance value over the entire image is input via the input terminal 101, a larger luminance value is set for a pixel position closer to the center of the screen, and a larger luminance value is set for a pixel position closer to the frame image. For the pixel positions in the perimeter, the smaller the brightness value is set, this is similar to the first embodiment. However, for a sub-frame image, the luminance value is updated to a constant value smaller than the minimum luminance value of the frame image after the luminance value change (display frame image), regardless of whether the pixel position is near the center or the periphery of the screen. In other words, the difference between the second embodiment and the first embodiment lies in the adjustment of the brightness value of the sub-frame image, and the rest of the processing is the same as the first embodiment. Similar to the first embodiment,...

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Abstract

The present invention provides an image display apparatus and an image display method. The image signal of each pixel of a frame image is multiplied by a gain value set in advance for each coordinate position on a display screen, so as to generate a display frame image in which the luminance value becomes smaller for a pixel closer to the periphery of the display screen and larger for a pixel closer to the center. The image signal of each pixel of a subframe image is multiplied by a gain value set in advance for each coordinate position on the display screen, so as to generate a display subframe image in which the luminance value becomes larger for a pixel close to the periphery of the display screen and smaller for a pixel close to the center of the display screen. The display frame image and display subframe image are sequentially displayed.

Description

technical field [0001] The present invention relates to an image display device and an image display method. Background technique [0002] In recent years, liquid crystal displays (referred to as "LCD") and the like have been receiving attention as flat panel displays. LCDs employ a driving method called "continuous driving," which keeps display brightness constant during one frame. On an LCD, the image looks blurry in a moving picture display, like a TV broadcast. [0003] In contrast, a display device using a cathode ray tube or FED (Field Emission Display, Field Emission Display) employs a driving method called "impulse driving" that emits intense light instantaneously for a short time. This type of display device does not have the problem of moving images looking blurry. [0004] In general, when the black display period among the display periods becomes longer, the display is closer to impulsive display, thereby improving the problem that the image looks blurry. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G5/36H04N7/01H04N5/14
CPCG09G2340/0435G09G3/2025G09G2320/0247G09G2320/0261
Inventor 小口高弘星伸宏
Owner CANON KK