OLED Display Luminance Control for Pixel Lifetime
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Solution Overview
Problem
Organic light-emitting display devices experience rapid deterioration and reduced lifetime when displaying high-brightness still images for extended periods due to excessive current flow, leading to non-uniform luminance across the screen.
Innovation Solution
A display device and method that include a controller to generate a gain for reducing peak luminance of still images, modulating pixel data, and a display panel drive circuit to write this data to sub-pixels, with the gain set to different values across the panel, gradually lowering peak luminance and current over time to prevent pixel deterioration and achieve uniform luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high brightness is maintained for still images, then luminance quality is improved, but pixel lifetime is reduced due to excessive current flow
Solution Approach 1:
The patent applies dynamic luminance control by adjusting the gain value based on the display duration of still images. The controller dynamically modifies pixel data with a gain that decreases over time, transitioning from maintaining high luminance to gradually reducing it, thereby balancing image quality with pixel longevity
Solution Approach 2:
The patent changes the luminance parameter over time by introducing a time-dependent gain factor. The gain value is modified based on the number of frames displayed, causing the peak luminance to decrease progressively while maintaining acceptable visual quality, thus reducing stress on pixels during extended still image display
2Device complexity
If uniform gain is applied across the display panel, then control simplicity is improved, but luminance uniformity deteriorates due to position-dependent characteristics
Solution Approach 1:
The patent implements local quality control by applying different gain values to different positions on the display panel. The controller divides the panel into multiple regions and assigns position-specific gain factors to compensate for local variations in luminance characteristics, achieving uniform overall luminance despite regional differences
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prolongs the lifespan of display device pixels and ensures uniform luminance across the screen by gradually reducing peak luminance during still image display, preventing image quality degradation and extending the device's operational life.
Implementation Method 1
An active-matrix organic light emitting display comprises organic light-emitting diodes (hereinafter, 'OLED'), which emit light by themselves
Data Source
AI summary
A display device comprises a display panel where an input image including a moving image and a still image is displayed; a controller configured to generate a gain for decreasing a peak luminance of the still image and modulate a pixel data of the still image by the gain; and a display panel drive circuit configured to write the pixel data received from the controller to sub-pixels of the display panel, wherein the gain is set to be a different value on a different position on the display panel.