Backlight Unit Segmentation for LCD Contrast Control
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Solution Overview
Problem
Liquid crystal display panels suffer from light leakage, resulting in low contrast due to the inability to effectively manage brightness across display units, particularly in dark statuses.
Innovation Solution
A display device driving method that involves a backlight module and a liquid crystal display panel, where a main control chip determines target brightness values and drive voltage values for each pixel and backlight unit, using a drive voltage conversion relationship table to dynamically adjust light emission based on display content, allowing for individual control of backlight units and pixels to enhance contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the backlight module uses a unified drive voltage for all backlight units, then the device complexity is reduced, but the contrast ratio deteriorates due to inability to suppress light leakage in dark areas
Solution Approach 1:
The backlight module is divided into multiple independently controllable backlight units, each corresponding to a display unit. This segmentation allows different brightness levels to be applied to different regions, enabling dark areas to have suppressed backlight (reducing light leakage) while bright areas maintain sufficient illumination, thereby improving contrast ratio without requiring complete redesign of the backlight system
Solution Approach 2:
The drive voltage for each backlight unit is dynamically adjusted based on the brightness requirements of its corresponding display unit. The main control chip determines target brightness values and converts them to appropriate drive voltages in real-time, allowing the backlight system to adapt to different display content and improve contrast ratio dynamically rather than using a fixed unified voltage
2Measurement precision
If the bit width of drive voltage values is increased to improve brightness control precision, then the contrast ratio is improved, but the data processing time and device complexity increase
Solution Approach 1:
The main control chip pre-determines the target brightness values for each backlight unit based on the display content before generating the actual drive signals. This preliminary calculation of brightness requirements allows the system to prepare the optimal drive voltage values in advance, reducing real-time processing delays while maintaining high precision brightness control
Solution Approach 2:
The system changes the bit width parameter of drive voltage values dynamically based on the specific brightness control requirements of each backlight unit. For units requiring fine brightness adjustment (dark areas), higher bit width is used for precision, while for units with less stringent requirements, lower bit width suffices, thus optimizing the balance between precision and processing efficiency
Data Source
AI summary
The present invention provides a display device driving method, a display device. The method achieves dynamic adjustment of a brightness of light emission of backlight units according to display contents corresponding to the display units. Also, conversion of a bit width of a drive voltage value is implemented based on a drive voltage conversion relationship table between first bit width drive voltage values and second bit width drive voltage values of the brightness values, which improves the driving effect of the backlight module.