Display Panel Stress Compensation for Image Sticking Control
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Solution Overview
Problem
Display devices using LEDs or OLEDs face pixel deterioration due to stress from varying driving currents, leading to reduced luminance and image quality issues like image sticking, which existing technologies have not adequately addressed.
Innovation Solution
A display device and method that accumulates stress data sets for display areas, performing compensation on data voltages based on these data sets to improve reliability and reduce image sticking by updating accumulative stress data sets using block indicators generated upon power-on, which can be count values or random numbers, and storing these data sets in a nonvolatile memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If driving current is increased to achieve high luminance, then luminance is improved, but pixel stress increases causing deterioration
Solution Approach 1:
The system performs preliminary compensation by accumulating stress data before image sticking becomes visible. The controller continuously monitors and accumulates stress data sets corresponding to each pixel's cumulative stress, enabling proactive compensation to prevent image sticking rather than reacting after deterioration occurs.
Solution Approach 2:
The system implements feedback by using accumulated stress data to adjust data voltages applied to pixels. The controller reads stress data sets from memory and applies compensation values to counteract the accumulated stress effects, creating a closed-loop system that continuously corrects for pixel deterioration.
2Reliability
If stress data is accumulated for all display areas, then image sticking compensation is improved, but memory requirements and processing complexity increase
Solution Approach 1:
The display panel is divided into multiple display areas, and stress data sets are accumulated separately for each display area. This segmentation allows the system to manage and process stress data in smaller, more manageable units, reducing the overall complexity compared to handling all pixel data as a single large data set.
Solution Approach 2:
The system applies different compensation strategies to different display areas based on their specific stress characteristics. By maintaining separate stress data sets for each display area, the system can optimize compensation locally for each region rather than applying a uniform approach across the entire display.
Data Source
AI summary
A display device includes: a display panel including display areas; a controller configured to control display a video through the display panel based on video frames being sequentially provided, each of the video frames including video data blocks corresponding to the display areas, respectively; and an indicator generator configured to generate a block indicator having a value that is changed based on power-on being performed, wherein the controller is configured to: select the video data block that is indicated by the block indicator from the video data blocks of the video frame that is first provided among the video frames, and update an accumulative stress data set of the corresponding display area based on the selected video data block of the video frame.