Video display apparatus

A technology of image display and display panel, which is applied in image communication, static indicator, TV, etc. It can solve the problems of low brightness of full white and increased power consumption, and achieve the effect of increasing power consumption, improving brightness and suppressing power consumption

Inactive Publication Date: 2010-07-28
HITACHI LTD
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0002] Compared with display devices using CRT or LCD, PDP display devices have lower contrast ratio (bright room contrast ratio) in bright daytime living rooms, etc., due to lower full white luminance.
In order to improve the display brightness, although the number of discharge pulses used to display and drive the PDP or its driving voltage can be increased, this will cause the problem of increased power consumption.

Method used

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Embodiment Construction

[0027] Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. In addition, in each figure, the same code|symbol is attached|subjected to the part which has the same function, and the overlapping description is abbreviate|omitted about the part already demonstrated in order to avoid complexity.

[0028] Hereinafter, as an image display device, a PDP display device will be described as an example, but the present invention is not limited to this device, and can also be applied to a display panel using a display panel whose power consumption increases according to the display load, for example, as a self-luminous display A liquid crystal image display device such as a field emission display (FED: field emission display) of a panel, an EL, and an LED panel provided with LEDs in a matrix.

[0029] Figure 5 It is a block diagram showing a PDP display device according to an embodiment of the present invention. In this fi...

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Abstract

In a display apparatus such as PDP, in order to obtain well-lighted video while suppressing an increase in power consumption, the luminance level of a specific region of a display panel is decreased in accordance with an average luminance level of the entire display panel. However, when a low-luminance region and a high-luminance region are mixed in display video, even the luminance of the low-luminance region is decreased and gray-scale crush is caused in some cases. An average luminance level for each region is detected, and a shading process is controlled for each region based on the detected region-specific average luminance level and the luminance level of input video. With this control, when the luminance level of the input video signal is higher than a predetermined threshold, the shading process is operated, and when the luminance level is lower than the predetermined threshold, the shading process is stopped.

Description

technical field [0001] The present invention relates to an image display device including a display panel, and more particularly, to a self-luminous display panel such as a plasma display panel (plasma display panel, hereinafter abbreviated as PDP), which can obtain a bright image while suppressing an increase in power consumption. A suitable image display device. Background technique [0002] Compared with display devices using CRTs or LCDs, PDP display devices have low total white brightness, and therefore have low contrast ratio (bright room contrast) in a bright living room or the like during the day. In order to improve the display brightness, although the number of discharge pulses for display driving the PDP or the driving voltage thereof can be increased, this will cause a problem of increased power consumption. [0003] As a conventional technique for improving the brightness of images while suppressing power consumption to solve the problem of such a PDP display d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/20G09G3/28G09G3/291H04N5/66
CPCG09G3/2003G09G2360/16H04N5/63G09G2330/021G09G3/2007G09G3/28G09G2320/0271G09G2310/0232G09G3/22
Inventor 西牧规之上田寿男
Owner HITACHI LTD
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