Timing Controller Brightness Enhancement via Dual Voltage Mapping
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Solution Overview
Problem
Liquid crystal display (LCD) panels with dual-gate structures face challenges in achieving equal luminance values for pure red, green, and blue images and pure white images, especially when displaying gray levels of opposite extremes, leading to brightness degradation issues.
Innovation Solution
A timing controller with a brightness control circuit comprising a gamma correction module, line overdrive module, and dithering module is used to enhance brightness by converting image data into gamma-corrected, line-OD-processed, and dithered data, which is then mapped into ordinary and extraordinary voltage ranges to display images with improved gray level transitions without significant cost increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If dual-gate panel structure is used to reduce cost, then manufacturing cost is reduced, but brightness uniformity and gray level transition accuracy deteriorate
Solution Approach 1:
The patent applies parameter changes by modifying the voltage ranges used for driving the display panel. It introduces an extraordinary voltage range in addition to the ordinary voltage range, allowing the display to achieve accurate gray level transitions and maintain brightness uniformity while using the cost-effective dual-gate panel structure. The timing controller selectively applies voltages from different ranges based on the gray level requirements.
2Device complexity
If ordinary voltage range is used for all gray levels, then device complexity is kept simple, but brightness enhancement for extreme gray level transitions cannot be achieved
Solution Approach 1:
The patent segments the voltage range into two distinct parts: an ordinary voltage range for normal gray level transitions and an extraordinary voltage range for extreme gray level transitions (from minimum to maximum gray levels). This segmentation allows the system to maintain simplicity for常规 operations while enabling brightness enhancement when needed, without requiring a completely complex new voltage generation system.
Data Source
AI summary
A timing controller includes gamma correction (GC), line overdrive (OD) and dithering modules. The GC module performs GC on image data of an input image to convert the image data into gamma corrected data within a partial GC range of a predetermined GC range, the line OD module performs line OD on at least one portion of the gamma corrected data to convert the gamma corrected data into line-OD-processed data within a predetermined line OD range, and the dithering module performs dithering on the line-OD-processed data to convert the line-OD-processed data into dithered data within a predetermined dithering range. The timing controller drives a display panel to map first and second partial data of the dithered data into ordinary and extraordinary voltage ranges of the display panel, respectively, for displaying the dithered image while enhancing brightness. A display module including the timing controller, the display panel, etc. is also provided.