Backlight Partition Compensation for Luminance Uniformity
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Solution Overview
Problem
Local dimming LCD displays face challenges in ensuring luminance uniformity across different backlight partitions due to manufacturing process deviations and LED driving mode variations, affecting the overall display quality.
Innovation Solution
A method is introduced where a display device with independently driven backlight partitions and corresponding display partitions uses a test image to determine a compensation coefficient by decoupling luminance, adjusting backlight data, and setting target luminance to improve luminance uniformity, which involves displaying a test image with uniform gray values, calculating luminance, decoupling influences from non-corresponding backlight partitions, and adjusting backlight data based on calculated ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If local dimming algorithm is used with Mini LED backlight source, then high contrast and display quality are improved, but luminance uniformity across different backlight partitions deteriorates due to manufacturing process deviations and LED driving mode variations
Solution Approach 1:
The patent applies local quality by dividing the backlight unit into multiple independently controllable backlight partitions, each with its own compensation coefficient. This allows different regions of the display to have customized luminance compensation, addressing manufacturing variations in different areas without affecting the entire display. Each display partition receives tailored backlight adjustment based on its specific luminance characteristics.
Solution Approach 2:
The patent changes the luminance parameter by introducing compensation coefficients that adjust the backlight data for each partition. By calculating the ratio between target luminance and actual luminance, the system dynamically modifies backlight intensity parameters to compensate for manufacturing deviations, thereby achieving uniform luminance across all partitions while maintaining high contrast capabilities.
2Adaptability or versatility
If independently driven backlight partitions are implemented, then local luminance control is improved, but system complexity increases due to the need for luminance measurement and compensation calculations
Solution Approach 1:
The system performs self-service by automatically measuring its own luminance characteristics and calculating compensation coefficients without external intervention. The display device captures images of itself, processes the luminance data, and generates adjusted backlight data autonomously, eliminating the need for complex external calibration equipment or manual adjustment mechanisms.
Solution Approach 2:
The patent implements feedback by using the captured display partition images to determine actual luminance values, comparing them against target values, and using the resulting compensation coefficients to adjust backlight output. This closed-loop feedback system continuously optimizes luminance uniformity while keeping the control algorithm computationally efficient through the use of simple ratio calculations.
Data Source
AI summary
The embodiments of the present application disclose a method of controlling display of a display device, an apparatus thereof and a display apparatus. The display device includes a backlight unit and a display panel, wherein the backlight unit includes a plurality of backlight partitions, each of which is independently driven, and the display panel includes a plurality of display partitions in one-to-one correspondence with the backlight partitions. The method comprises: causing the display panel to display a test image, wherein each pixel of the test image has a same gray value; acquiring a luminance of each display partition of the display panel; determining a compensation coefficient according to the luminance of each display partition; adjusting backlight data of the backlight partition according to the compensation coefficient to obtain adjusted backlight data of each backlight partition; and providing the adjusted backlight data to the backlight unit for display by the display panel.