LCD Brightness Extractor Modulating Average Picture Level
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Solution Overview
Problem
Liquid crystal display (LCD) devices cause eye glare and fatigue due to high brightness levels, especially when showing dynamic video content, as they maintain peak brightness similar to full white brightness, leading to excessive brightness on snowy backgrounds.
Innovation Solution
A method and device for reducing eye glare and fatigue by separating brightness and color difference information from input images, calculating and restricting the average picture level (APL) using a brightness extractor and APL restrictor, and modulating the brightness to convert RGB data for representation on an LCD panel, ensuring the average APL is lower than a predetermined limit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the LCD device maintains peak brightness equal to full white brightness for accurate color representation, then color accuracy is improved, but eye glare and eye fatigue increase
Solution Approach 1:
The patent applies dynamics by making the brightness level dynamic rather than static. The display device automatically adjusts the full white brightness level based on the average brightness of the displayed image content. When the image content is bright, the full white level is lowered to reduce eye strain; when the image content is dark, the full white level is raised to maintain color accuracy. This dynamic adaptation resolves the contradiction between maintaining peak brightness for color accuracy and reducing brightness to prevent eye glare.
Solution Approach 2:
The patent changes the brightness parameter (full white level) based on the statistical characteristics of the displayed image. By analyzing the average brightness of the image content and adjusting the full white brightness level accordingly, the system maintains optimal color representation while preventing excessive brightness that causes eye fatigue. This parameter change approach allows the display to adapt to different image conditions rather than maintaining a fixed peak brightness level.
2Illumination intensity
If the LCD device uses high peak brightness for maximum visibility, then visibility is improved, but the brightness becomes excessively high causing eye strain
Solution Approach 1:
The system dynamically adjusts the peak brightness level based on the actual image content being displayed. Instead of maintaining a constantly high peak brightness, the full white level is modulated according to the average brightness of the current image. This ensures that peak brightness is only as high as necessary for the displayed content, reducing eye strain while maintaining sufficient visibility.
Solution Approach 2:
The display device performs self-adjustment by automatically analyzing the brightness characteristics of the displayed image and modifying its own full white level accordingly. This self-service mechanism eliminates the need for manual brightness adjustment and ensures that the peak brightness is always optimized for the current content, preventing excessive brightness that would cause eye strain.
3Stability of the object's composition
If the LCD device maintains constant full white brightness for consistent color display, then color consistency is improved, but the average brightness becomes too high for comfortable viewing
Solution Approach 1:
The patent introduces dynamics to the previously static full white brightness level. By continuously monitoring the average brightness of the displayed image and adjusting the full white level in response, the system maintains color consistency within each image while adapting the overall brightness level to comfortable viewing conditions. This dynamic adjustment allows the display to preserve color accuracy without maintaining a constantly high average brightness.
Data Source
AI summary
The present disclosure is related to the liquid crystal display device and the driving method for selectively controlling the average picture level. The liquid crystal display device of the present disclosure comprises: a brightness extractor separating a brightness and a color difference information from an input image; an user interface receiving a limit APL; an APL restrictor calculating an average APL of the input image based on the brightness from the brightness extractor, modulating the brightness of the input image such that the average APL is restricted lower than the limit APL when the average APL of input image is higher than the limit APL, and converting the modulated brightness and the color difference information into a RGB data; and a driving circuit representing the RGB data from the APL restrictor on a liquid crystal display panel.