Display Gamma Correction Using Position and Temperature Compensation
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Solution Overview
Problem
Display devices experience color coordinate shifts due to variations in grayscale values, temperature, and position, leading to deteriorated display quality.
Innovation Solution
A gamma correction method that includes determining first voltage codes based on target gamma values and color coordinates at reference measurement points, generating lookup tables, and applying position, grayscale, and temperature correction values to stabilize luminance and color coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If gamma correction is performed using a single lookup table at a reference measurement point, then the gamma correction process is simple, but color coordinate shift occurs according to position, temperature, and grayscale value
Solution Approach 1:
The patent divides the display panel into multiple measurement points (reference measurement point and correction measurement points at different positions). Separate voltage codes are determined for each measurement point, and position correction values are calculated based on the ratios of voltage codes between correction points and reference point. This segmentation approach resolves the contradiction by maintaining color coordinate consistency across different positions without significantly increasing system complexity.
Solution Approach 2:
The patent introduces temperature as a variable parameter and determines temperature correction values by measuring luminance at different temperatures (reference temperature and correction temperature). The correction values are calculated based on the ratio of luminance at reference temperature to luminance at correction temperature. This parameter-based correction approach maintains color coordinate consistency under varying temperature conditions while keeping the correction mechanism relatively simple.
2Manufacturing precision
If multiple correction values are calculated for different positions and temperatures, then color coordinate consistency is improved, but the correction process complexity increases
Solution Approach 1:
The patent performs preliminary measurements and calculations during the correction process: voltage codes are determined in advance for each measurement point, position correction values are pre-calculated based on voltage code ratios, and temperature correction values are pre-determined based on luminance ratios at different temperatures. These preliminary actions enable the system to achieve color coordinate consistency without requiring complex real-time calculations during normal operation, thus resolving the contradiction between precision and complexity.
Solution Approach 2:
The patent introduces correction values as intermediary parameters that mediate between the raw display output and the desired color coordinate consistency. Position correction values and temperature correction values serve as intermediaries that simplify the correction process by pre-processing the complex relationships between position/temperature and color coordinates, making the overall system easier to manage while maintaining high precision.
Data Source
AI summary
A gamma correction method for a display device determines a first voltage code for a first color corresponding to each of grayscale values based on a target gamma value and a target color coordinate at a reference measurement point, generates a first lookup table including the first voltage code for the first color, determines a second voltage code for the first color corresponding to each of the grayscale values based on the target gamma value and the target color coordinate at a correction measurement point, generates a first color position correction value based on the first voltage code for the first color and the second voltage code for the first color, and performs gamma correction using the first color position correction value and the first lookup table.