Display Device Gamma Voltage Correction for Temperature Drift
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Solution Overview
Problem
Display devices face challenges in maintaining image quality due to temperature changes, as the light emission characteristics of sub-pixels in display panels vary with temperature.
Innovation Solution
A display device and method that corrects image data by using temperature correction lookup tables to adjust gamma reference voltages for each gamma tab, based on detected temperature information, thereby improving image quality across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If temperature correction lookup tables are used to correct gamma reference voltages for each gamma tab, then image quality is improved through accurate temperature compensation, but memory capacity requirements increase
Solution Approach 1:
The patent divides the temperature correction data into multiple lookup tables, each corresponding to different temperature ranges. Instead of storing correction data for all possible temperatures in a single large table, the system segments the temperature domain and creates separate LUTs for different segments, reducing the memory required for each individual table while maintaining comprehensive coverage.
Solution Approach 2:
The patent changes the parameter of temperature correction by storing only the necessary correction values for specific temperature points rather than continuous temperature data. By selecting key temperature points and storing correction values only at these points, the system reduces memory requirements while maintaining effective temperature compensation across the full operating range.
2Measurement precision
If gamma reference voltages are corrected for each gamma tab based on temperature, then temperature correction accuracy is enhanced, but device complexity increases
Solution Approach 1:
The patent performs preliminary correction by pre-calculating and storing temperature correction values in lookup tables during the manufacturing or initialization phase. During actual operation, the system simply retrieves pre-computed correction values from the LUTs based on the current temperature, avoiding complex real-time calculations and reducing operational device complexity while maintaining high correction accuracy.
Solution Approach 2:
The patent introduces lookup tables as an intermediary data structure between the temperature sensor and the gamma reference voltage generation. The LUTs serve as a mediator that translates temperature measurements into appropriate correction values, simplifying the control logic and making the temperature compensation process more manageable without sacrificing accuracy.
Data Source
AI summary
A display device includes a memory configured to store gamma sets set for luminances and driving frequencies of images and temperature correction lookup tables set for temperatures, a gamma set selector configured to select a gamma set according to a luminance and a driving frequency of an externally input image, and a temperature corrector configured to select a temperature correction lookup table according to a result of detection of temperature information of a display panel displaying the image and to reflect an offset for each gamma tab stored in the temperature correction lookup table in a gamma reference voltage for each gamma tab stored in the gamma set to generate a corrected gamma set.