Display Signal Processing Circuit Gamma Correction
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Solution Overview
Problem
Conventional image display methods either suppress contrast in divided regions or fail to adequately express brightness in white peak portions due to fixed gain settings, leading to inadequate contrast and brightness feelings.
Innovation Solution
An image display apparatus with detection and conversion means to adjust image data based on the size of color regions, specifically using a signal processing circuit to enhance brightness and contrast by varying the gain according to the size of white or red regions, thereby improving perceived brightness and contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display screen is divided into regions and gamma correction is applied independently to each region, then the contrast feeling is improved compared to whole-screen correction, but the gain is still suppressed to one of a plurality of white peaks causing portions to lack contrast feeling
Solution Approach 1:
The patent applies different gamma correction characteristics to different luminance regions within the display screen. Specifically, it uses multiple gamma correction curves (first, second, and third curves) corresponding to different luminance ranges, allowing each region to have optimized contrast characteristics rather than applying a single uniform correction to the entire screen.
Solution Approach 2:
The patent dynamically selects and applies different gamma correction curves based on the luminance characteristics of the input image. The system determines which gamma correction curve to apply by analyzing the luminance distribution, enabling adaptive contrast optimization that responds to the actual content being displayed rather than using a fixed correction approach.
2Illumination intensity
If the dynamic range is changed in accordance with the average luminance level, then white peak characteristics like CRT are realized, but the gain is determined irrespective of area and width of white peak causing inadequate brightness expression in white peak portions
Solution Approach 1:
The patent applies different gain adjustments to different luminance regions based on their specific characteristics. The first gain is applied to a first luminance region and the second gain is applied to a second luminance region, allowing each region to receive optimized brightness enhancement rather than applying a uniform gain across the entire display.
Solution Approach 2:
The patent changes the gamma correction parameters and gain values based on the luminance characteristics of the input image. By selecting different gamma correction curves and applying different gains according to the luminance distribution, the system adapts the display parameters to better express brightness in various portions of the image.
Data Source
AI summary
An image display apparatus includes a display device, and a signal processing circuit. In at least one case where an image is displayed by a first image signal which designates a first image having a first region of a predetermined color and a predetermined brightness, the first region has a first width in a predetermined direction, and in at least one case where an image is displayed by a second image signal which designates a second image, which is an image in which average luminance of an entire image is the same as that of the first image, having a second region of the predetermined color and the predetermined brightness, the second region has a second width larger than the first width in the predetermined direction. The brightness of the first region in the image which is displayed by the first image signal is brighter than that of the second region in the image which is displayed by the second image signal, by the signal processing in the signal processing circuit.