Display Panel Compensation for Temperature and Gray-Level Color Drift
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Solution Overview
Problem
Display devices experience a color drift phenomenon due to changes in color coordinates influenced by temperature and gray level after initial luminance and color correction, leading to undesired color shifts over time.
Innovation Solution
A display device with a panel driver that stores color coordinate compensation data and efficiency data, determines temperature values and gray levels to calculate color coordinate compensation values, and generates corrected image data to maintain consistent color output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If LCC operation is performed during manufacturing to achieve desired color coordinate, then initial color accuracy is improved, but color drift occurs after driving time due to temperature and gray level changes
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing color coordinate compensation values for various temperature and gray level conditions in lookup tables during manufacturing. These compensation values are prepared in advance to counteract the color drift that will occur during operation, allowing the display device to maintain color accuracy without real-time complex calculations.
Solution Approach 2:
The patent implements feedback by measuring the actual temperature and gray level during operation, retrieving corresponding compensation values from pre-stored lookup tables, and applying these compensation values to correct the color coordinates in real-time. This closed-loop approach continuously counteracts color drift based on actual operating conditions.
2Reliability
If compensation data is stored for multiple temperature and efficiency conditions, then color drift prevention capability is improved, but device complexity increases
Solution Approach 1:
The patent reduces runtime complexity by performing the complex compensation calculations in advance during manufacturing and storing the results in lookup tables. During operation, the system only needs to retrieve pre-computed compensation values based on measured temperature and gray level, significantly simplifying the real-time processing requirements.
Solution Approach 2:
The patent uses lookup tables that store copied compensation data for various conditions instead of performing complex real-time calculations. This approach trades increased storage requirements for reduced computational complexity during operation, making the system more practical for embedded display controllers.
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, and a panel driver coupled to the display panel. The panel driver stores color coordinate compensation data representing a color coordinate compensation value according to a temperature value and a light emitting element efficiency, stores efficiency data representing the light emitting element efficiency according to a gray level, determines temperature values of the plurality of pixels to determine color coordinate compensation values for the plurality of pixels based on the color coordinate compensation data, the efficiency data and the temperature values of the plurality of pixels, generates corrected image data by correcting input image data based on the color coordinate compensation values, and drives the display panel based on the corrected image data.