Backlight Luminance Adjustment for LCD Color Gamut Uniformity
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Solution Overview
Problem
Traditional LCDs face issues with color gamut uniformity across the entire brightness range, particularly in low brightness conditions, leading to color distortion, loss of dark details, and unstable color temperature due to varying grayscale trends of red, green, and blue colors.
Innovation Solution
A display device with a stacked configuration of a display panel and a backlight source, where the display area and backlight unit are divided into corresponding units, allowing for adjustable grayscale voltage and luminance to match the to-be-displayed luminance, using a grayscale mapping relationship to optimize color gamut consistency across the brightness range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional LCD operates in low brightness range with increasing grayscale, then luminance increases, but color gamut remains small and color coordinates change significantly causing color distortion
Solution Approach 1:
The patent applies dynamics by making the backlight unit's luminance adjustable according to the grayscale level. In low brightness ranges, the backlight luminance is reduced to match the lower grayscale values, preventing color distortion. This dynamic adjustment of backlight luminance based on grayscale ensures color gamut uniformity across different brightness levels while maintaining accurate color reproduction.
Solution Approach 2:
The patent changes the operating parameters by adjusting both the grayscale voltage and backlight luminance simultaneously. By coordinating the change of backlight luminance parameter with the grayscale parameter, the system maintains consistent color gamut characteristics across the entire brightness range, resolving the contradiction between luminance increase and color uniformity.
2Illumination intensity
If grayscale increases in low brightness range, then luminance increases, but color temperature becomes unstable and dark details are lost
Solution Approach 1:
The system dynamically adjusts backlight luminance to match the grayscale level, preventing color temperature instability. By reducing backlight luminance in low brightness ranges, the patent maintains stable color temperature characteristics and preserves dark details that would otherwise be lost due to excessive backlight emission.
Solution Approach 2:
The patent implements feedback control by monitoring the grayscale level and adjusting backlight luminance accordingly. This feedback mechanism ensures that color temperature remains stable across different grayscale values, preventing the color temperature jumps that occur in traditional LCDs when grayscale increases in low brightness ranges.
3Illumination intensity
If backlight luminance is increased to improve brightness, then illumination intensity increases, but color gamut uniformity deteriorates across the brightness range
Solution Approach 1:
The patent applies dynamics by making backlight luminance adjustable according to grayscale level. Instead of using fixed high luminance, the system dynamically reduces backlight luminance in low brightness ranges to match the corresponding grayscale values, maintaining color gamut uniformity while providing sufficient brightness where needed.
Solution Approach 2:
The system changes the backlight luminance parameter dynamically based on the grayscale parameter. By coordinating these parameter changes, the patent achieves both adequate brightness and uniform color gamut across the entire brightness range, resolving the contradiction between illumination intensity and color uniformity.
Data Source
AI summary
The present disclosure provides a display device, including a display panel and a backlight source sequentially stacked. The backlight source is on a light incidence side of the display panel; the display device is divided into at least one display area, the display panel is divided into at least one display unit, the backlight source is divided into at least one backlight unit; the display area at least includes one display unit and one backlight unit; each backlight unit at least corresponds to one display unit; the backlight unit is configured to provide a light source for the display unit; and in the display area, at least one of a grayscale voltage of the display unit and a luminance of the backlight unit is adjustable. The present disclosure further provides a driving method of a display device, a driving device and a display apparatus.