Regional Backlight Compensation for VA Display Flicker Reduction
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Solution Overview
Problem
Large-dimension display devices using negative vertical alignment (VA) liquid crystal technology experience rapid brightness saturation and color cast at large view angles, leading to image quality issues, and existing solutions cause noticeable flicker due to high and low voltage differences between sub-frames.
Innovation Solution
A display device and driving method that divide a red-green-blue backlight source into regions, allowing independent control of light source brightness, alternating high and low voltage signals for sub-pixels, and calculating backlight brightness compensation signals based on average driving voltages to alleviate brightness differences between sub-frames, reducing flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high and low voltage signals are alternately applied to sub-pixels to improve image quality, then image quality is improved, but brightness difference between sub-frames causes noticeable flicker
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the backlight brightness compensation signal amplitude based on the average driving voltage of sub-pixels. When high voltage is applied to sub-pixels, the backlight brightness is reduced, and when low voltage is applied, the backlight brightness is increased, thereby compensating for the brightness difference between sub-frames and eliminating flicker while maintaining image quality
Solution Approach 2:
The patent implements feedback control by calculating the average driving voltage of sub-pixels in real-time and using this information to generate appropriate backlight brightness compensation signals. The system continuously monitors the driving voltage state and adjusts the backlight brightness accordingly, creating a closed-loop control system that effectively suppresses flicker
2Measurement precision
If the backlight source is divided into regions with independent control, then brightness compensation precision is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the backlight source into multiple independently controllable regions. Each region can be adjusted separately based on the driving voltage state of corresponding sub-pixels, enabling precise local brightness compensation. This segmentation approach allows the system to achieve high precision brightness control while managing complexity through modular region-based management
Data Source
AI summary
A display device, wherein a drive circuit thereof is used to display each frame of image by means of two sub-frames; and determining, according to an average drive voltage of sub-pixels of all colors, the magnitudes of backlight compensation signals respectively corresponding to the two sub-frames so as to adjust the light emission brightness of a light source.