OLED Display Sticking Prevention via Dual Control Circuits
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Solution Overview
Problem
Display panels using OLEDs suffer from a sticking phenomenon where brightness degrades over time, leading to image quality degradation, and existing techniques fail to effectively alleviate this issue regardless of the type of input image.
Innovation Solution
An image processing apparatus with dual control circuits that adjust the brightness of pixels at intervals, along with a still image detection mechanism, to prevent sticking by controlling image data and display timing signals, thereby minimizing the adverse effects without degrading image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single sticking prevention control method is applied to OLED display, then the control complexity is low, but the sticking phenomenon is not significantly alleviated for all display conditions
Solution Approach 1:
The display control function is segmented into multiple independent control circuits (first control circuit and second control circuit), each implementing different sticking prevention methods. The first control circuit applies dithering control to vary pixel brightness, while the second control circuit applies sub-field control to adjust display timing. This segmentation allows each circuit to specialize in a particular prevention technique, improving overall reliability without requiring one complex circuit to handle all methods simultaneously.
Solution Approach 2:
Multiple sticking prevention control methods are merged by combining the outputs of the first control circuit and second control circuit. The control signals from both circuits are integrated to produce the final display control signal, allowing simultaneous application of dithering control and sub-field control. This merging enables comprehensive sticking prevention that addresses various display conditions (still images, moving images, different brightness levels) more effectively than any single method alone.
2Reliability
If multiple control circuits are used to prevent sticking phenomenon, then the sticking prevention effectiveness is improved, but the device complexity increases
Solution Approach 1:
The control system is divided into specialized segments (first control circuit for dithering, second control circuit for sub-field control), allowing each to implement simpler, more reliable algorithms for their specific function rather than one complex circuit attempting to handle all prevention scenarios.
Solution Approach 2:
The multiple control circuits are designed to work together in a universal sticking prevention system that handles various display conditions (still images, moving images, different brightness levels, different refresh rates). The first and second control circuits collectively provide multi-functional coverage, making the overall system adaptable to all OLED sticking scenarios without requiring separate specialized circuits for each condition.
3Reliability
If sticking prevention control is applied continuously, then the brightness degradation is reduced, but the power consumption increases
Solution Approach 1:
The control circuits apply sticking prevention methods periodically rather than continuously. The first control circuit applies dithering control at specific intervals by varying pixel brightness at given intervals, while the second control circuit applies sub-field control at specific refresh rate intervals. This periodic application maintains brightness stability over time while allowing the OLED pixels to rest between control cycles, reducing cumulative power consumption compared to continuous control.
Data Source
AI summary
An image processing apparatus that performs display control of an image displayed on a display unit, includes a first control circuit for controlling image data of a frame in question or a display timing control signal corresponding to the image data so as to display each pixel forming the image with different brightness at given intervals, and a second control circuit for controlling the image data or the display timing control signal by different control from that by the first control circuit so as to display each pixel forming the image with different brightness at given intervals, wherein the first control circuit and the second control circuit control image data of an identical frame or a display timing control signal corresponding to the image data.