Common Voltage Look-Up Table for LCD Flicker Compensation
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Solution Overview
Problem
In large-size LCD TVs, the charging differences between pixels lead to uneven brightness and flickering issues, particularly in areas other than the center, due to varying common voltage values, affecting display quality.
Innovation Solution
A driving method that uses a common voltage look-up table to optimize common voltage values for different areas of the display panel by adjusting and recording the smallest flicker value, generating a table based on preset gray-scale values and corresponding optimal voltage settings, ensuring uniform charging across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single common voltage value is used for the entire display panel, then the circuit design is simple, but charging uniformity across different areas deteriorates
Solution Approach 1:
The display panel is divided into multiple preset areas (e.g., center area, upper area, lower area, left area, right area), and each area has its own common voltage look-up table. This segmentation allows different voltage compensation strategies for different regions, improving charging uniformity while maintaining manageable system complexity through modular area-based control.
Solution Approach 2:
Different common voltage values are applied to different preset areas of the display panel based on their specific charging characteristics. The center area, upper area, lower area, left area, and right area each receive optimized voltage values from their respective look-up tables, achieving local optimization of charging uniformity rather than applying a uniform voltage across the entire panel.
2Manufacturing precision
If the common voltage value is adjusted for each gray-scale value, then charging uniformity is improved, but the complexity of voltage control increases
Solution Approach 1:
Common voltage look-up tables are pre-generated for each preset area and each gray-scale value through systematic testing. During actual display operation, the timing control chip simply queries the pre-computed look-up table based on the current gray-scale value and area, avoiding complex real-time voltage calculations while maintaining optimal charging uniformity.
Solution Approach 2:
The complex real-time voltage optimization problem is replaced by pre-computing and storing optimal voltage values in look-up tables. The timing control chip performs simple table lookups instead of complex voltage calculations, substituting a computationally intensive control system with a simpler memory-based retrieval system.
3Manufacturing precision
If different common voltage look-up tables are used for different preset areas, then charging uniformity across areas is improved, but the data storage requirement increases
Solution Approach 1:
The display panel is divided into multiple preset areas (e.g., center area, upper area, lower area, left area, right area), and each area has its own common voltage look-up table. This segmentation allows different voltage compensation strategies for different regions, improving charging uniformity while managing data storage through organized area-based tables.
4Manufacturing precision
If multiple common voltage values are tested and recorded for different gray-scale values, then optimal voltage selection is improved, but the calibration process time increases
Solution Approach 1:
The calibration process systematically tests and records optimal common voltage values for each preset area and gray-scale value combination before product deployment. This preliminary action creates comprehensive look-up tables that enable fast runtime operation, trading off calibration time during manufacturing for rapid voltage selection during actual display operation.
Data Source
AI summary
A driving method and a display device are disclosed. The driving method drives the display panel according to a common voltage look-up table, and the common voltage look-up table is generated by a method including: driving a preset area for display with a preset area gray-scale value; shooting the preset area and obtaining a brightness and a flicker value corresponding to the preset area; adjusting the common voltage value multiple times, and recording the common voltage value when the corresponding flicker value is the minimum as the optimal common voltage value; adjusting the preset area gray-scale value multiple times, and recording a plurality of optimal common voltage values corresponding to the adjusted preset area gray-scale values; and generating the common voltage look-up table according to the multiple preset area gray-scale values and the corresponding optimal common voltage values.