Display Driver Voltage Drop Compensation via Pixel Position Correction
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Solution Overview
Problem
Display panels, such as OLED panels, experience image mura due to voltage drop across power source lines, leading to inconsistent image brightness and quality.
Innovation Solution
A display driver system comprising image processing circuitry, compensation circuitry, and voltage data generator circuitry that generates correction values based on total current consumption and pixel positions to compensate for voltage drop, ensuring consistent drive voltages are applied to pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power source voltage is supplied to pixel circuits via power source lines, then pixel circuits can operate, but voltage drop across power source lines causes mura in displayed image
Solution Approach 1:
The compensation circuit generates correction values in advance based on the total current value and pixel positions before the actual drive operation. This preliminary calculation of compensation amounts allows the system to pre-correct for expected voltage drops, ensuring consistent image quality without real-time adjustments during display operation.
Solution Approach 2:
The system changes the drive voltage parameter dynamically based on pixel position and total current consumption. By adding position-dependent and current-dependent compensation values to the original drive voltages, the system adjusts voltage parameters to compensate for voltage drops, thereby maintaining uniform image brightness across the display panel.
2Loss of energy
If multiple power source terminals are used to supply power, then voltage drop can be reduced, but device complexity increases
Solution Approach 1:
The compensation circuit applies different correction values to different pixel locations based on their positions relative to power source terminals. This local quality approach means that pixels closer to power terminals receive different compensation than pixels farther away, optimizing voltage compensation locally rather than applying a uniform correction across the entire display.
Solution Approach 2:
The system calculates the total current consumption and uses this feedback information to generate appropriate compensation values. By monitoring the actual current draw and adjusting compensation accordingly, the system creates a closed-loop control mechanism that adapts to varying display conditions and optimizes voltage distribution.
Data Source
AI summary
A display driver comprises image processing circuitry, compensation circuitry, voltage data generator circuitry, and drive circuitry. The image processing circuitry is configured to generate a first voltage data based on an image data corresponding to an image to be displayed on a display panel. The compensation circuitry is configured to generate correction values for pixels of the display panel, based on a total current consumed in the pixels of the display panel and positions of the pixels in the display panel. The voltage data generator circuitry is configured to generate a second voltage data by correcting the first voltage data based on the correction values. The drive circuitry is configured to write drive voltages into the pixels based on the second voltage data.