Display Module Backlight Driving for Wide-Angle Color Deviation
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Solution Overview
Problem
Large-size liquid crystal display panels, especially Vertical Alignment (VA) LCD panels, suffer from severe color deviation and reduced color saturation when viewed from wide angles due to rapid brightness saturation with voltage, leading to poor image quality.
Innovation Solution
A driving method for a display module that adjusts the intensity of light sources by converting RGB color signals into HSV color space signals, adjusting color saturation, and calculating light source adjustment coefficients to synchronize the brightness of primary and secondary hue light sources, thereby compensating for color deviation and maintaining color saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the brightness of light sources is increased to improve color saturation, then color saturation is improved, but color deviation worsens due to rapid brightness saturation with voltage
Solution Approach 1:
The patent segments the backlight module into multiple independent controllable light source groups with different color hues (first hue, second hue, third hue, etc.). Each group can be adjusted independently, allowing precise control over the spectral composition to achieve color saturation without excessive brightness increase that causes color deviation.
Solution Approach 2:
The patent changes the brightness parameters of different hue light sources based on the displayed image content. By dynamically adjusting the intensity of each hue group according to the image's color characteristics, the system maintains color saturation while avoiding the brightness saturation effect that causes color deviation in conventional single-backlight systems.
2Device complexity
If a single backlight module is used to simplify the device structure, then device complexity is reduced, but the ability to independently control color saturation and brightness is lost
Solution Approach 1:
The backlight module is divided into multiple light source groups with different hues that can be independently controlled. This segmentation enables the system to adjust color saturation and brightness separately by modulating different hue groups, providing adaptability while maintaining a relatively simple overall structure compared to fully independent RGB backlight systems.
Solution Approach 2:
The patent makes a single backlight module serve multiple functions by enabling independent control of multiple hue groups within it. The same physical backlight structure can adapt to different display needs (color saturation enhancement, brightness adjustment, color deviation correction) through software-controlled intensity modulation of different hue groups.
3Device complexity
If conventional backlight driving is used to maintain simple driving circuits, then device complexity is reduced, but color deviation cannot be corrected at wide viewing angles
Solution Approach 1:
The patent implements dynamic control of light source intensities based on the displayed image content and viewing conditions. The driving circuit adjusts the brightness of different hue groups in real-time according to the image's color characteristics, enabling color deviation correction at wide viewing angles through dynamic parameter adjustment rather than static circuit design.
Solution Approach 2:
The system changes the driving parameters (intensity) of different hue light sources based on image analysis. By detecting the color characteristics of the displayed image and adjusting the corresponding light source intensities, the system corrects color deviation dynamically without requiring complex additional hardware circuits.
Data Source
AI summary
The present disclosure provides a driving method of a display module, a driving system thereof, and a display device. The driving method of the display module includes a display panel driving process, and a backlight module driving process driven synchronously with the display panel driving process. The display panel driving process includes steps: performing a color saturation adjustment; and obtaining second color signals to drive the display panel. The backlight module driving process includes steps: obtaining a first light source adjustment coefficient and a second light source adjustment coefficient; obtaining a second brightness value and a third brightness value; and driving the primary hue light source and the secondary by the second brightness value and the third brightness value respectively.