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Video display apparatus

A technology for displaying video and displaying brightness, which can be used in TVs, color TVs, static indicators, etc., and can solve problems such as not being able to obtain average brightness information

Inactive Publication Date: 2007-09-05
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, the average luminance signal s104 detected by the average luminance detection unit 1003 has an error to the average luminance actually displayed on the display device, and correct average luminance information cannot be obtained.

Method used

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Embodiment Construction

[0024] In the invention related to the present application, the term "brightness" is used, but this also includes, as in the case of display using the pulse width modulation method, visually changing the brightness for a predetermined period (in the case of pulse width modulation, to This predetermined period is modulated) and added to realize gray scale display.

[0025] In addition, in the invention related to this application, although the output of the conversion circuit is input to the adjustment circuit as an input signal, it may also be input indirectly through another circuit (a circuit that performs a desired calculation as needed) instead of directly. The input comes from the output of the transformation circuit.

[0026] Various configurations can be adopted as a preferable aspect of the first invention related to the present application.

[0027] As a second invention, a configuration in which an adjustment circuit for adjusting an input signal based on a pluralit...

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Abstract

A video display apparatus comprises: a converting circuit for executing nonlinear conversion for an input signal; a display brightness featured value detecting circuit for detecting a display brightness featured value indicating a brightness of a display screen from the input signal; and an adjustment circuit receiving an output of the converting circuit for adjusting the received signal on the basis of the display brightness featured value, wherein the display brightness featured value detecting circuit is placed on a stage after the converting circuit, and an image is displayed on the basis of an output of the adjustment circuit.

Description

technical field [0001] The present invention relates to video display devices. Background technique [0002] As a video display device, it is known to have an ABL circuit and a contrast adjustment circuit. In particular, ABL is known, which is controlled so that the average display luminance of the screen does not increase excessively for the purpose of concentrating light beams and suppressing power consumption. [0003] In Japanese Patent Application Laid-Open No. 2000-221941, a structure for performing ABL is disclosed. Here, the automatic brightness control circuit is used to adjust the brightness level of the pixel data of each pixel sequentially supplied by the A / D converter, so that the average brightness of the image displayed on the PDP screen converges within the predetermined brightness range. The luminance level adjustment here is performed before the inverse gamma conversion correction is performed by setting the ratio of the number of times of light emission ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/20G09G5/10H04N5/66G09G3/22
CPCG09G3/22G09G2320/0276G09G2320/0626G09G2320/066G09G2320/0606G09G3/20G09G3/2014G09G2360/16
Inventor 森真起子
Owner CANON KK