Display Control Device for Text Window Luminance Adjustment
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Solution Overview
Problem
Display devices struggle to manage the luminance of bright text windows in relation to image content, leading to glare and reduced visibility, as existing techniques do not effectively consider the glaringness experienced by users and often decrease the overall display unit's luminance, affecting image visibility.
Innovation Solution
A display control device and method that compares the peak level of an image signal of a text window portion with the peak level of an image portion, adjusting the gain to decrease the peak level of the whole screen image when the image portion's peak is higher, thereby reducing the brightness of the text window without altering the image's brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the luminance of the bright window is increased to improve text visibility, then the text window becomes too glaring and uncomfortable for direct viewing
Solution Approach 1:
The patent applies local quality by differentiating the luminance control between the text window portion and the image portion. The control unit selectively adjusts the luminance of the text window independently from the image, allowing optimized visibility for text while preventing excessive brightness in this specific region, thereby reducing glaringness without affecting overall image quality.
2Object-affected harmful factors
If the luminance of the whole display unit is decreased to reduce glaringness of the text window, then the visibility of the image is reduced
Solution Approach 1:
The patent segments the display unit into distinct portions: the text window portion and the image portion. The control unit independently controls the luminance of each segment, allowing the text window luminance to be adjusted to reduce glaringness while maintaining the image portion luminance at levels that ensure proper visibility. This segmentation enables targeted luminance management without compromising overall image quality.
3Illumination intensity
If existing white color temperature optimization techniques are applied, then both small areas and large areas are optimized, but the glaringness felt by users directly looking is not addressed
Solution Approach 1:
The patent extends parameter changes beyond white color temperature optimization to include direct luminance control of the text window portion. The control unit adjusts the luminance parameter specifically for the text window based on its peak luminance level compared to the image portion, thereby addressing user-perceived glaringness while maintaining the benefits of white color temperature optimization for both small and large areas.
Data Source
AI summary
A display control device to which an image signal is supplied from outside includes: a display control unit configured to control a display of a screen image on a display unit in response to the image signal supplied; a comparison unit configured to make a comparison between a peak level of an image signal of a text window portion displayed on the display unit and a peak level of an image signal of an image of an image portion displayed on the display unit; and a luminance control unit configured to, when a result of the comparison indicates that the peak level of the image signal of the image of the image portion is higher than the peak level of the image signal of the text window portion, control an adjustment of a gain in a direction of decreasing a peak level of the whole screen image.