Display Panel Driver Luminance Compensation for Color Shift Control
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Solution Overview
Problem
Display devices experience luminance and color coordinate shifts due to variations in luminous efficiency based on grayscale values and temperature, leading to deteriorated display quality.
Innovation Solution
A display device that compensates for luminance by detecting a first pattern in input image data, calculating luminance and grayscale weights, and applying compensation data voltages to pixels to maintain consistent luminance and color coordinates across different grayscale values and temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gamma correction is performed to adjust luminance and color, then display quality is improved, but color coordinate shift occurs due to different luminous efficiency at various grayscale values and temperatures
Solution Approach 1:
The patent applies different luminance weights to different color channels (R, G, B) based on their specific luminous efficiency characteristics at each grayscale value. This local quality approach ensures that each color is compensated according to its individual performance, preventing color coordinate shifts while maintaining overall display quality.
Solution Approach 2:
The patent dynamically changes luminance weights as a function of grayscale values and temperature conditions. By adjusting these parameters in real-time based on operating conditions, the system compensates for variations in luminous efficiency without requiring complex hardware modifications.
2Reliability
If luminance compensation is applied to maintain consistent display quality, then color coordinate stability is improved, but device complexity increases due to pattern detection and weight calculation mechanisms
Solution Approach 1:
The patent pre-calculates and stores luminance weights for various grayscale values and temperature conditions. This preliminary action allows the compensation mechanism to operate efficiently by simply retrieving pre-computed weights rather than performing complex real-time calculations, thereby reducing operational complexity while maintaining reliability.
Solution Approach 2:
The patent implements a feedback mechanism that detects the current display pattern and temperature, then applies appropriate luminance weights to compensate for observed variations. This closed-loop approach ensures color coordinate stability while keeping the compensation logic relatively simple through pattern-based classification.
3Manufacturing precision
If pattern-based luminance compensation is implemented, then color representation uniformity is improved, but processing time increases due to pattern detection and weight application steps
Solution Approach 1:
The patent applies luminance compensation selectively based on detected display patterns rather than uniformly across all display conditions. By identifying specific patterns that cause color coordinate shifts and applying compensation only in those cases, the system achieves improved color uniformity while minimizing unnecessary processing overhead.
Solution Approach 2:
The patent pre-preares luminance weight tables for different grayscale values and temperature conditions, allowing rapid lookup and application during operation. This preliminary preparation significantly reduces real-time processing time while maintaining accurate color compensation.
Data Source
AI summary
A display device may include a display panel including pixels, and a display panel driver. The display panel driver may receive an input image, detect a first pattern from input image data of the input image, determine a luminance weight for each color based on a luminance of the input image of the first pattern and a luminance of a reference image of a second pattern, apply, in response to detecting of the first pattern, the luminance weight to data voltages to determine compensation data voltages, and apply the compensation data voltages to the pixels.