Display Controller YCbCr Conversion Asymmetric Gain
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Solution Overview
Problem
Existing display apparatuses struggle to enhance image expressivity by effectively converting RGB data signals into brightness and color components without image processing, leading to limitations in brightness, local contrast, colorfulness, and sharpness.
Innovation Solution
A display apparatus with a controller that converts RGB data signals into YCbCr data signals using a gain determination graph with asymmetric gain values, enhancing brightness and local contrast by adjusting pixel brightness and varying color weights based on saturation ranges for each hue, thereby improving image expressivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If RGB data signal is directly displayed without conversion, then device complexity is reduced, but image expressivity (brightness, contrast, colorfulness) is insufficient
Solution Approach 1:
The patent converts RGB data signals to YCbCr color space parameters and applies gamma correction and tone mapping to transform the signal characteristics. This parameter transformation enables independent control of brightness (Y) and color (CbCr) components, significantly improving image expressivity while maintaining manageable system complexity through standardized processing pipelines.
Solution Approach 2:
The patent introduces an intermediate YCbCr color space as a mediator between the input RGB signal and the display output. This intermediate representation separates luminance and chrominance information, allowing independent optimization of brightness and color rendering without directly modifying the original RGB signal structure, thus improving image quality while keeping the processing architecture organized.
2Manufacturing precision
If brightness of center pixel is increased to enhance local contrast, then local contrast is improved, but overall brightness uniformity may be affected
Solution Approach 1:
The patent enhances local contrast by selectively adjusting the brightness of center pixels within defined regions of interest while leaving surrounding pixels unchanged. This localized brightness enhancement is applied based on edge detection and region segmentation, improving local contrast in specific areas without uniformly affecting the entire image, thus maintaining overall brightness uniformity while enhancing local detail visibility.
Data Source
AI summary
The present disclosure provides a display apparatus including a display panel displaying an image, a driver driving the display panel, and a controller controlling the driver, wherein the controller converts an RGB data signal supplied from the outside into a YCbCr data signal, and performs image processing based on a gain determination graph having a horizontal asymmetric gain value with respect to a reference point, to enhance brightness of the YCbCr data signal.