Flexible OLED Display Luminance Control for Panel Lifespan
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Solution Overview
Problem
The lifespan of OLED display panels is reduced due to material deterioration and increased current density, leading to decreased light-emitting efficiency and image defects, particularly in high-resolution displays where the light-emitting area per pixel is minimized.
Innovation Solution
An image processing method that detects the bending degree of a flexible display panel and adjusts the luminance of specific sub-areas using various image processing schemes to reduce the current density of light-emitting elements, thereby extending the lifespan of the display panel by gradually decreasing luminance in still images or areas with high bending degrees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the current density of OLED elements is increased to achieve high resolution displays, then the light-emitting area per pixel is reduced and image quality is improved, but the lifetime of the OLED elements is significantly reduced
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the luminance driving parameters of OLED elements based on their aging characteristics. The system modifies the current density and luminance levels over time to reduce stress on the OLED materials, thereby extending their operational lifetime while maintaining display quality within acceptable ranges
Solution Approach 2:
The patent implements dynamics by introducing time-varying luminance adjustment mechanisms. The display system continuously adapts the luminance of OLED elements based on their age and usage conditions, transitioning from static high-resolution display to dynamic luminance control that responds to panel aging states
2Duration of action of stationary object
If the luminance of OLED elements is reduced to extend their lifetime, then the decay speed is mitigated, but the display brightness and visibility are decreased
Solution Approach 1:
The patent applies local quality by implementing spatially and temporally differentiated luminance adjustment. Different regions of the display panel receive customized luminance adjustments based on their specific aging characteristics, and the luminance reduction is applied selectively to still images or specific sub-areas rather than uniformly across the entire display, thereby minimizing the impact on overall display brightness
3Duration of action of stationary object
If image processing schemes are applied to reduce luminance, then the lifetime of light emitting elements is extended, but the image quality and visual perception may be affected
Solution Approach 1:
The patent applies partial action by selectively reducing luminance only in specific conditions - primarily for still images and in sub-areas with high bending degrees - rather than applying uniform luminance reduction to all displayed content. This selective approach extends element lifetime while minimizing impact on image quality for dynamic or important display content
Solution Approach 2:
The patent uses parameter changes by adjusting image processing parameters such as luminance levels, contrast, and brightness dynamically based on the bending degree detection and still image determination, thereby maintaining acceptable image quality while achieving lifetime extension
Data Source
AI summary
An image processing method and a display device thereof are provided. The method is adapted to a display panel with a display area. The image processing method includes the following steps. Whether original images to be displayed on a plurality of sub-areas of the display area are still is analyzed and determined. When the original image in a current sub-area is still, a time length of the original image being still is recorded. The current sub-area is one of the sub-areas. Processing levels corresponding to a plurality of image processing schemes are determined based on the time length. Overall or partial luminance (luma) of the original image in the current sub-area is gradually reduced by the image processing schemes with the determined processing levels, and a corresponding luma-reduced image is displayed on the current sub-area.