Brightness Compensation for Display Panels Using White Subpixels
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Solution Overview
Problem
Large-size display devices face uneven brightness issues due to uneven electrical properties of thin film transistors (TFTs) and backlight modules in LCD panels, affecting image quality and being costly to rectify.
Innovation Solution
A method and apparatus that utilize white subpixels to compensate for brightness by determining and applying compensating grayscale voltages, calculated using initial voltage and compensation coefficients, to improve backlight uniformity across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If machining precision and quality of the backlight source are improved to prevent uneven backlight brightness, then the uniformity of backlight brightness is improved, but the cost of the LCD module will increase dramatically
Solution Approach 1:
The patent changes the electrical parameters (grayscale voltages) of the white subpixels dynamically to compensate for backlight non-uniformity. By adjusting the voltage parameters applied to different regions' white subpixels, the display brightness is equalized without modifying the physical backlight structure, thus avoiding increased manufacturing costs while improving backlight brightness uniformity.
Solution Approach 2:
The patent replaces the mechanical/optical approach (improving backlight source machining precision) with an electrical control approach (adjusting grayscale voltages of white subpixels). Instead of physically modifying the backlight module to achieve uniformity, the system uses electrical signal adjustment to compensate for the non-uniformity, thereby reducing manufacturing complexity and cost.
2Illumination intensity
If the structural design of the backlight module is optimized to achieve even backlight distribution, then the brightness uniformity is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the brightness compensation function from the backlight module structure itself and transfers it to the pixel-level control system. By separating the compensation function from the optical path and implementing it through electrical control of white subpixels, the backlight module structure remains simple while achieving brightness uniformity through software/firmware control.
Solution Approach 2:
The patent makes the white subpixels serve dual functions: their normal display function and a compensation function for backlight non-uniformity. By utilizing the existing white subpixel structure for both purposes, the system avoids adding separate compensation hardware, thereby reducing device complexity while achieving brightness uniformity.
Data Source
AI summary
The present disclosure provides a method for controlling brightness compensation for pixel units of a display device, comprising: driving white subpixels in the pixel units to compensate the pixel units for the brightness according to predetermined pixel units whose brightness is to be compensated for in the display device and compensating grayscale voltages corresponding to the brightness of the pixel units to be compensated.