Display Controller Static Image Burn-In Prevention
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Solution Overview
Problem
Image burn-in is a significant issue in display panels, particularly with OLEDs, due to prolonged exposure to static images at high brightness levels, which can cause pixel aging and permanent image retention.
Innovation Solution
The proposed solution involves an electronic device and method that utilize a display controller to monitor the brightness changes between successive images and activate a timer when a static image is detected. The display controller then gradually reduces the brightness of each pixel based on the timer values, ultimately reducing the overall brightness to prevent burn-in.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If static images are displayed at high brightness levels for extended periods, then image quality and visibility are improved, but pixel components age and image burn-in occurs
Solution Approach 1:
The patent implements periodic brightness adjustment by detecting static images and applying progressive dimming at different time intervals (first dimming after first time period, second dimming after second time period). This periodic action reduces pixel stress while maintaining visibility during normal operation, thereby preventing burn-in without sacrificing image quality during dynamic content display.
Solution Approach 2:
The patent changes the brightness parameter dynamically based on image stability detection and time duration. When a static image is detected, the brightness is progressively reduced through multiple dimming levels (first brightness level, then lower second brightness level). This parameter change allows the display to operate at high brightness when needed while protecting pixels during extended static display periods.
2Reliability
If brightness is reduced to prevent burn-in, then pixel aging is slowed, but image visibility and quality deteriorate
Solution Approach 1:
The patent makes the brightness level dynamic rather than static by implementing a multi-stage dimming system that adapts to the duration of static image display. The brightness remains at full level during normal operation but progressively reduces only when static images are detected for extended periods. This dynamic adjustment prevents burn-in while maintaining optimal visibility during active content display.
Solution Approach 2:
The patent applies preliminary brightness reduction measures before severe burn-in can occur by detecting static images early and initiating progressive dimming sequences. The first dimming operation occurs after a first time period, and a second dimming operation occurs after a second time period, preventing the need for complete brightness reduction while still protecting against burn-in.
3Reliability
If progressive brightness reduction is applied to static images, then burn-in probability is reduced, but system complexity increases due to timer and detection mechanisms
Solution Approach 1:
The display controller is designed to perform multiple functions: normal image display, static image detection, timer management, and progressive brightness adjustment. By making the controller multi-functional, the patent avoids adding separate dedicated components for burn-in prevention, thereby reducing overall system complexity while achieving reliable burn-in protection through integrated control.
Data Source
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AI summary
A display apparatus is provided, which includes a display panel and a display controller. The display controller calculates an image average brightness of each image in a video signal from a host. When an absolute difference between a first image average brightness of a current image and a second image average brightness of a previous image is smaller than a predetermined value, the display controller activates a timer to obtain a timer value. When the timer value reaches a first duration, the display controller reduces brightness of each pixel in the current image by a first ratio. When the timer value reaches a second duration, the display controller reduces the brightness of each pixel in the current image by a second ratio. The second duration is longer than the first duration, and the second ratio is higher than the first ratio.