Display Panel Stress Compensation Using Reference Image Frames
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Solution Overview
Problem
Existing display devices face issues with pixel deterioration due to stress accumulation, leading to reduced luminance and display quality, particularly in high luminance images, which consumes significant resources in stress data processing.
Innovation Solution
A control device for a display panel that estimates stress applied to the panel by selecting a reference image frame, updating stress data for partial areas, and correcting image frames based on accumulated stress data, reducing the calculation and resource requirements for stress compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If stress data for all pixels is accumulated with high resolution, then measurement precision of pixel stress is improved, but device complexity and resource consumption increase
Solution Approach 1:
The display panel is divided into multiple zones, and stress data is accumulated separately for each zone rather than for every individual pixel. This segmentation approach maintains adequate measurement precision for stress compensation while significantly reducing the total data volume and resource requirements.
Solution Approach 2:
Instead of accumulating stress data for all pixels at full resolution, the patent applies partial action by selecting representative pixels or averaging stress values within zones. This provides sufficient compensation accuracy without the excessive resource consumption of processing every pixel's complete stress history.
2Illumination intensity
If driving current is increased for high luminance images, then illumination intensity is improved, but stress on pixels increases causing deterioration
Solution Approach 1:
The system performs preliminary action by accumulating stress data over time and generating compensation values before they are needed. This allows the compensation to be applied proactively to prevent image sticking, rather than reactively after damage occurs.
Solution Approach 2:
The patent converts the harmful effect of stress accumulation into a beneficial compensation mechanism. By monitoring and accumulating stress data, the system generates compensation values that counteract the stress-induced deterioration, turning the problem of stress into a solution for maintaining display quality.
3Reliability
If image sticking compensation is performed for all pixels, then display quality is improved, but calculation amount and processing time increase
Solution Approach 1:
The compensation process is segmented by applying it at the zone level rather than the individual pixel level. This reduces the calculation amount and processing time while maintaining adequate compensation effectiveness for the entire display area.
Solution Approach 2:
The patent changes the parameter of compensation granularity from pixel-level to zone-level. This parameter change significantly reduces the computational burden and processing time while preserving the essential compensation function for maintaining display quality.
Data Source
AI summary
Provided is a control device connected to a display panel including a controller configured to display images by driving the display panel according to data corresponding to image frames, and a memory connected to the controller. The controller is configured to select at least one of the image frames as a reference image frame, and update stress data corresponding to a partial area of the display panel in the memory based on one image data block selected from image data blocks of the reference image frame.