OLED Display Calibration Voltage-Grayscale Mapping
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Solution Overview
Problem
The nonuniformity in OLEDs across display panels due to variations in fabrication processes leads to inconsistent luminance and grayscale values, affecting display performance and requiring calibration to ensure uniformity.
Innovation Solution
A method for calibrating light-emitting elements in display panels by determining a mapping correlation between voltages and luminance values, and using interpolation to reduce the number of measured grayscale and voltage values, thereby streamlining the calibration process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the calibration process measures all grayscale values and corresponding voltages for each pixel, then the accuracy of the voltage-grayscale correlation is improved, but the calibration time increases significantly
Solution Approach 1:
The patent applies partial action by measuring only a subset of grayscale values (N grayscale values where N is less than the total number of grayscale values) rather than all possible grayscale values. This partial measurement approach, combined with interpolation techniques, achieves sufficient calibration accuracy while dramatically reducing the number of measurements required, thus resolving the contradiction between measurement precision and calibration time
Solution Approach 2:
The patent uses interpolation to generate virtual measurement data points that copy and estimate the characteristics of unmeasured grayscale-voltage relationships. By creating these interpolated data points based on measured subsets, the system achieves comprehensive correlation accuracy without performing exhaustive measurements on all grayscale values
2Measurement precision
If the calibration process uses a large number of measured grayscale and voltage values, then the correlation accuracy is improved, but the productivity of the calibration process decreases
Solution Approach 1:
The patent implements partial action by determining N grayscale values and their corresponding voltages where N is specifically chosen to be less than the total number of grayscale values. This selective measurement approach maintains sufficient correlation accuracy while reducing the measurement workload, thereby improving calibration productivity without sacrificing essential precision
Solution Approach 2:
The patent changes the parameter of measurement quantity from exhaustive (all grayscale values) to optimized (N grayscale values). By adjusting this parameter and combining it with interpolation methods, the system achieves an optimal balance between correlation accuracy and calibration productivity, resolving the contradiction between these two factors
Data Source
AI summary
Method and system for calibrating a plurality of voltages of a light-emitting element and a plurality of grayscale values of a respective pixel of the light-emitting element on a display panel are provided. The method may include determining a mapping correlation between the plurality of voltages of the light-emitting element and a plurality of luminance values of the light-emitting element, determining N grayscale values of the pixel, and determining N first luminance values each corresponding to the respective one of the N grayscale values. The method may also include determining N first voltages mapped to the N first luminance values using the mapping correlation and determining, of each one of the N first luminance values, (M−1) second luminance values. Each one of the (M−1) second luminance values may correspond to a different dimmed luminance value of the respective first luminance value.