Display Driver IC Mura Compensation via Gamma Mapping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Mura defects, causing contrast-type defects such as 'blobs', 'bands', and 'streaks' due to imperfections in display components, result in undesirable luminance modulations and affect the quality of liquid crystal displays, which existing technologies fail to adequately address.
Innovation Solution
An integrated circuit with a gamma mapping unit and a mura compensation unit that maps gray levels to gamma codes and compensates them using de-mura tables to generate a compensation result, reducing mura effects by adjusting display voltages based on mura calibration data specific to panel areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gamma table settings are modified to adjust display characteristics, then display quality and luminance uniformity can be improved, but the complexity of the system increases due to the need for multiple calibration tables and compensation data
Solution Approach 1:
The patent applies parameter changes by modifying gamma table settings and compensation data to adjust display characteristics. The system dynamically adjusts gamma values and compensation parameters to achieve desired luminance uniformity while adapting to different display panels and viewing conditions, thereby improving display quality through parameter optimization.
Solution Approach 2:
The patent implements preliminary action by pre-calculating and storing compensation data in lookup tables during manufacturing. The mura compensation unit uses pre-computed compensation values that are applied during normal operation, eliminating the need for real-time complex calculations and reducing system complexity while maintaining high precision.
2Adaptability or versatility
If multiple calibration tables are stored to support different gamma settings, then adaptability to different display panels is improved, but memory requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-computing compensation data for different gamma settings and storing them in lookup tables during manufacturing. This allows the system to adapt to different display panels by simply selecting the appropriate pre-computed compensation data, eliminating the need for real-time calculations and reducing memory requirements.
Solution Approach 2:
The patent uses parameter changes by storing compensation data corresponding to different gamma values in lookup tables. The system can adapt to different display panels by selecting the appropriate compensation parameters based on the panel characteristics, achieving versatility without requiring storage of all possible combinations of gamma and compensation data.
3Manufacturing precision
If real-time compensation calculations are performed for each pixel, then display uniformity is improved, but processing time and computational complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating compensation values for all possible gamma settings and storing them in lookup tables during manufacturing. During normal operation, the system simply retrieves pre-computed compensation values from the tables, eliminating the need for real-time complex calculations and significantly reducing processing time while maintaining high display uniformity.
Solution Approach 2:
The patent replaces complex real-time computational mechanisms with simpler lookup table retrieval operations. Instead of performing complex mathematical calculations for each pixel in real-time, the system uses pre-computed data stored in lookup tables, substituting computational complexity with data retrieval operations that are much faster and more efficient.
Data Source
AI summary
An integrated circuit for driving a display panel is provided. The integrated circuit includes a gamma mapping unit and a mura compensation unit. The gamma mapping unit is configured to receive a gray level of an image data, map the gray level to a gamma code according to at least one gamma table, and output the gamma code. The mura compensation unit is configured to receive the gamma code, and compensate the gamma code according to at least one de-mura table to generate a compensation result after the gamma mapping unit performs the step of mapping the gray level to the gamma code. The integrated circuit drives the display panel according to the compensation result. In addition, a method for driving a display panel is also provided.