Display Driver APL Compensation for OLED Voltage Drop
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Solution Overview
Problem
Display devices with organic light-emitting diodes face issues of brightness fluctuations and color distortion due to variations in high-potential driving voltage, affecting display quality.
Innovation Solution
A display device with a data driver that calculates an average picture level (APL) of input image data and generates a data voltage based on a compensation value to compensate for voltage drops, with independent settings for each color, using a compensation circuit and gamma voltage generator to adjust the data voltage accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a high-potential driving voltage is supplied to the display panel to achieve high brightness, then the brightness increases, but voltage drop fluctuation causes brightness difference and display quality degradation
Solution Approach 1:
The data driver performs preliminary compensation by calculating the APL of input image data and generating a compensation value before converting the data signal to voltage. This compensation value is used to adjust the data voltage in advance, preventing brightness fluctuation caused by high-potential driving voltage drop, thereby maintaining brightness uniformity across the display panel.
2Illumination intensity
If a high-potential driving voltage is supplied to achieve high brightness, then the brightness increases, but color coordinates become distorted
Solution Approach 1:
The data driver applies different compensation values to different color channels (R, G, B) based on their respective APLs. Each color has its own compensation mechanism, allowing precise control of color coordinates while maintaining high brightness. This local quality approach ensures that each color channel is compensated according to its specific characteristics, preventing color distortion.
3Manufacturing precision
If compensation value is independently set for each color to prevent color distortion, then color accuracy is maintained, but device complexity increases
Solution Approach 1:
The data driver merges the APL calculation, compensation value generation, and data signal conversion functions into a single integrated circuit. The compensation values for different colors are generated and applied within the same driver, reducing the need for separate compensation circuits for each color channel. This merging approach maintains color accuracy while minimizing device complexity.
Data Source
AI summary
Disclosed is a display device comprising: a display panel on which a plurality of pixels of different colors are arrayed; a power supply configured to supply a high-potential driving voltage to the display panel; and a data driver configured to calculate an average picture level of input image data, and generate a data voltage based on a compensation value for compensating for a voltage drop of the high-potential driving voltage based on the calculated APL, wherein the compensation value is independently set for each of the colors.