Display Driving Controller Temperature Compensation Lookup Tables
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Solution Overview
Problem
Current display technologies face challenges in maintaining optimal display quality due to temperature-induced degradation of gamma light characteristics, particularly color coordinate distortion, which affects the accuracy of gray levels in emission-type display layers like organic light emitting diodes.
Innovation Solution
An electronic device with a driving controller that calculates and applies temperature-compensated lookup tables based on image signals and temperature data, using a luminance weight to generate image data, thereby compensating for temperature-induced degradation and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If temperature compensation is not applied, then the device complexity is low, but the display quality and color coordinate accuracy deteriorate due to temperature-induced gamma light characteristic degradation
Solution Approach 1:
The patent pre-calculates and stores multiple lookup tables corresponding to different temperature conditions before actual operation. When the display device operates, the controller simply retrieves the appropriate pre-calculated lookup table based on measured temperature, avoiding complex real-time calculations. This preliminary preparation resolves the contradiction by maintaining high display quality through temperature compensation while keeping the operational device complexity low.
Solution Approach 2:
The patent creates multiple copies of lookup tables, each optimized for specific temperature ranges. Instead of using a single complex compensation algorithm, the system stores multiple simplified lookup table copies that can be quickly accessed. This copying approach maintains accurate color coordinates and gamma characteristics across temperatures while minimizing the computational complexity during actual display operation.
2Measurement precision
If real-time temperature compensation calculations are performed, then the color coordinate accuracy is improved, but the processing time and productivity are reduced
Solution Approach 1:
The lookup tables are pre-calculated offline and stored in memory, eliminating the need for complex real-time mathematical computations. During operation, the controller only needs to measure temperature and perform a simple table lookup, which is computationally trivial. This resolves the contradiction by achieving high color coordinate accuracy through pre-computation while maintaining fast processing speeds during actual display refresh cycles.
Solution Approach 2:
The patent uses simplified lookup table structures that can be quickly generated and discarded if needed, rather than maintaining complex persistent compensation algorithms. The lookup tables are lightweight data structures that enable fast access and minimal processing overhead, resolving the trade-off between accuracy and processing speed by using computationally inexpensive compensation mechanisms.
3Manufacturing precision
If gray levels are processed individually, then the precision of gray level compensation is high, but the computational load and device complexity increase
Solution Approach 1:
The patent segments the gray level range into multiple zones and creates separate lookup tables for each zone. This segmentation allows the system to apply tailored compensation characteristics to different gray level regions, maintaining high precision for each individual gray level while managing computational complexity through organized zonal processing. Each zone's lookup table can be optimized independently, resolving the contradiction between individual gray level precision and overall system complexity.
Data Source
AI summary
An electronic device includes a display layer, a data driving circuit, a scan driving circuit, a driving controller, and a temperature sensor which measures a temperature of the display layer to generate temperature data. The driving controller includes a first lookup table calculating unit which calculates a first lookup table based on the image signal, the temperature data, and a reference lookup table set for each of a plurality of gray levels, a luminance compensating unit which calculates a luminance weight based on luminance data, and a second lookup table calculating unit which calculates a second lookup table based on the first lookup table and the luminance weight, and the driving controller generates the image data based on the image signal and the second lookup table.