Display Device Degradation Compensator Luminance Balancing
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Solution Overview
Problem
Display devices face challenges in maintaining luminance balance to counteract light emitting element degradation and prevent afterimages, especially when displaying fixed partial images like logos for extended periods.
Innovation Solution
A display device with a degradation compensator that adjusts pixel grayscales based on stored degradation information, using a lookup table to modify output grayscales and apply gain values to counteract degradation variations, thereby balancing luminance increase and decrease to prevent afterimages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the luminance of light emitting elements is increased to counteract degradation, then the display luminance is maintained, but afterimages occur more prominently in fixed partial image portions
Solution Approach 1:
The patent applies different luminance adjustment strategies to different regions of the display. High degradation pixels (which cause afterimages) receive luminance compensation, while low degradation pixels maintain their original characteristics. This local differentiation is achieved through per-pixel degradation degree storage and selective grayscale adjustment based on individual pixel aging states
Solution Approach 2:
The system performs preliminary degradation assessment by storing degradation degrees for each pixel and using lookup tables to pre-determine appropriate luminance adjustments. This advance preparation allows the system to proactively compensate for degradation effects before they manifest as visible luminance loss or afterimages, rather than reacting to problems after they occur
2Object-generated harmful factors
If image processing is performed to search for logos and adjust luminance, then afterimages are prevented, but processing time and complexity increase
Solution Approach 1:
The display system uses its own stored degradation information to automatically adjust luminance without requiring external image analysis. The degradation compensator queries pre-stored degradation degrees for each pixel and applies appropriate luminance adjustments independently, eliminating the need for time-consuming logo search and recognition processes while maintaining effective afterimage prevention
Data Source
AI summary
A display device is disclosed that includes pixels, a memory, and a degradation compensator. The pixels include light emitting elements. The memory is operable to store degradation information including degradation degrees of the light emitting elements. The degradation compensator is operable to receive the degradation information and generate output grayscales by changing each of input grayscales of the pixels in proportion to each of the degradation degrees. The degradation compensator includes a degradation information changer for changing the degradation information by decreasing a degradation degree having a variation greater than a threshold value among variations of the degradation degrees.