Image Compensator for Display Pixel Degradation
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Solution Overview
Problem
Display devices, such as OLED and LCD, experience pixel degradation over time, leading to afterimages when fixed high-luminance images are displayed for extended periods, causing accelerated degradation and afterimage formation.
Innovation Solution
An image compensator system that applies two distinct image shift scenarios to update and correct shift directions, using a combination of first and second shift controllers to perform image shifts based on target directions, maximizing shift effects and minimizing degradation by adjusting shift amounts and directions dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a fixed image is displayed with high luminance for a long time, then the image quality is maintained, but pixel degradation accelerates and afterimages occur
Solution Approach 1:
The patent applies periodic image shifting where the display image is shifted by predetermined distances in alternating directions (first direction in odd frames, second direction in even frames). This periodic action prevents fixed high-luminance images from continuously stressing the same pixels, thereby reducing pixel degradation and afterimage formation while maintaining overall image quality
Solution Approach 2:
The patent performs preliminary image shifting before displaying the image data. By shifting the image data in advance based on predetermined shift amounts and directions, the system prevents fixed images from remaining stationary on the display panel,从而避免像素长时间承受高亮度负荷
2Duration of action of stationary object
If image shifting is applied to prevent pixel degradation, then pixel lifespan is extended, but image display accuracy may be compromised
Solution Approach 1:
The patent employs periodic image shifting with alternating directions and predetermined distances. The shift amounts are carefully controlled to be within acceptable ranges that prevent pixel degradation while maintaining image display accuracy. The periodic nature ensures that shifts are distributed evenly over time, preventing cumulative distortion
Solution Approach 2:
The patent applies different shift strategies to different types of image content. Fixed images (such as logos or stationary elements) receive shifting treatment to prevent pixel degradation, while moving images or content requiring high precision may use reduced or no shifting. This local differentiation maintains overall image quality while protecting pixels
3Reliability
If multiple image shift controllers are used to maximize shift effects, then pixel degradation is reduced, but device complexity increases
Solution Approach 1:
The patent combines multiple shift control functions into an integrated image compensator that manages both first and second shift controllers. This unified structure coordinates the alternating shift operations, determines appropriate shift amounts based on image content analysis, and manages the periodic shifting schedule, thereby reducing overall system complexity while maintaining effective degradation prevention
Solution Approach 2:
The image compensator performs multiple functions: it analyzes image content to identify fixed vs. moving images, determines optimal shift amounts and directions, coordinates alternating shift patterns, and adapts shifting parameters based on display conditions. This multi-functional design eliminates the need for separate dedicated controllers for each function, reducing device complexity
Data Source
AI summary
An image compensator includes: a shift path updater for updating a first preliminary shift direction of a fixed image included in an image in a preset first period according a first shift scenario, and updating a second preliminary shift direction of the fixed image in a preset second period according a second shift scenario; a shift direction determiner for correcting the first preliminary shift direction and the second preliminary shift direction respectively to a first target shift direction and a second target shift direction, based on a result obtained by comparing the first preliminary shift direction and the second preliminary shift direction; a first shift controller for performing a first image shift, based on the first target shift direction; and a second shift controller for performing a second image shift, based on the second target shift direction.