OLED Brightness Calibration via Per-Pixel Gamma Curve Fitting
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Solution Overview
Problem
Existing methods for calibrating brightness unevenness in OLED display panels are inefficient due to large deviations in the Gamma curve of each pixel, requiring repeated testing and interpolation to achieve uniform brightness, which is time-consuming and inaccurate.
Innovation Solution
A method involving the creation of a brightness matrix at three gray scales, determining uniform and uneven brightness areas, calculating and fitting a Gamma curve for each pixel, and using the fitting Gamma curve to calibrate the uneven brightness area, eliminating the need for repeated testing and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If repeated shooting and trimming of gray scale is performed to obtain correction values, then the accuracy of brightness uniformity is improved, but the calibration time increases significantly
Solution Approach 1:
The patent measures and establishes individual Gamma curves for each pixel in advance, creating a comprehensive correction model before actual calibration. This preliminary characterization of each pixel's Gamma characteristics enables direct calculation of correction values without repeated iterative testing, thus improving accuracy while reducing calibration time.
Solution Approach 2:
The patent creates a digital model (Gamma curve) that copies the actual optical characteristics of each pixel. Instead of physically adjusting each pixel through repeated testing, the system uses the copied Gamma curve model to calculate and apply correction values directly, eliminating the need for repeated shooting and trimming operations.
2Device complexity
If a uniform Gamma value is used for all pixels, then the calibration process is simplified, but the compensation accuracy for Mura areas deteriorates due to large Gamma curve deviations
Solution Approach 1:
The patent applies local quality by establishing individual Gamma curves for each pixel rather than using a uniform Gamma value across the entire display. Each pixel's correction is based on its own measured Gamma characteristics, allowing precise compensation for local variations in the Mura areas while maintaining a systematic approach to the overall calibration process.
Solution Approach 2:
The patent changes the Gamma parameter from a uniform value applied to all pixels to individual Gamma curve parameters for each pixel. By measuring and storing the specific Gamma characteristics of each pixel, the system enables precise compensation that adapts to local variations, significantly improving compensation accuracy for Mura defects.
Data Source
AI summary
The present disclosure provides a method for calibrating brightness unevenness of an OLED display panel, the method includes: getting a brightness matrix of an OLED display panel in at least three gray scales, and determining a uniform brightness area and an uneven brightness area, and calculating a fitting Gamma value of each pixel corresponding to the at least three gray scales in the uneven brightness area, and fitting the fitting Gamma curve of the each pixel in the uneven brightness area, and calibrating the brightness of the uneven brightness area based on the fitting Gamma curve of the each pixel. The present disclosure can improve the accurate of the calibrating brightness and the efficiency of the calibration.