Display Panel Degradation Uniformity Control via Sub-Pixel Current Segmentation
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Solution Overview
Problem
Display devices with sub-pixels containing light emitting elements and driving transistors experience varying degradation over time, leading to non-uniform aging and deteriorated image quality due to differences in characteristic values among sub-pixels.
Innovation Solution
A display device with a display panel and a driving circuit that detects areas of significant degradation and adjusts the voltage supply to sub-pixels to accelerate or decelerate degradation uniformly, ensuring uniform image quality by reversing the brightness pattern of afterimage-prone areas during a controlled image quality period when the display is not exposed to users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If normal driving is applied to all sub-pixels, then productivity is maintained, but degradation uniformity deteriorates causing afterimage
Solution Approach 1:
The patent segments the display panel into multiple degradation regions based on accumulated current data, and applies different degradation control strategies to each region. This allows selective application of degradation uniformity restoration driving only to areas where afterimage is predicted, rather than uniformly treating the entire display panel.
Solution Approach 2:
The patent implements local quality control by applying different driving modes to different regions: normal driving for regions without afterimage risk, and degradation uniformity restoration driving for regions with afterimage risk. This localized approach maintains overall productivity while addressing degradation uniformity issues only where necessary.
2Reliability
If degradation uniformity restoration driving is applied to all areas, then degradation uniformity improves, but power consumption increases
Solution Approach 1:
The patent divides the display panel into afterimage occurrence predicted areas and non-predicted areas based on accumulated current data, and applies degradation uniformity restoration driving only to the predicted areas. This segmentation prevents unnecessary power consumption in regions where afterimage is not expected.
Solution Approach 2:
The patent applies degradation uniformity restoration driving partially rather than universally - specifically to regions where afterimage is predicted based on accumulated current thresholds. This partial action approach achieves sufficient degradation uniformity improvement without the excessive power consumption that would result from applying the same driving mode to the entire panel.
3Reliability
If degradation uniformity restoration driving is performed during display period, then degradation uniformity improves, but image quality deteriorates due to user viewing
Solution Approach 1:
The patent implements periodic action by performing degradation uniformity restoration driving during non-display periods when the display is not exposed to users. This timing strategy allows degradation control operations to occur without interfering with normal display functionality or user viewing experience.
Solution Approach 2:
The patent performs preliminary detection of afterimage occurrence predicted areas based on accumulated current data before executing degradation uniformity restoration driving. This preliminary identification ensures that restoration driving is applied at the appropriate time and location, preventing image quality issues during user viewing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves image quality by reducing degradation differences between sub-pixels, extending the display panel's lifespan and minimizing power consumption without affecting user viewing experience.
Implementation Method 1
a light emitting element which emits light in response to application of a drive signal
Data Source
AI summary
A display device includes a display panel and a display driving circuit having improved degradation uniformity. The display panel includes sub-pixels, each of which includes a light emitting element and a driving transistor. The display driving circuit drives the display panel to display a degradation uniformity restoration image in an afterimage occurrence predicted area detected in the display panel during an image quality control period. The afterimage occurrence predicted area includes first and second sub-pixels of the sub-pixels. Before the image quality control period, the amount of accumulated current having flowed through the first sub-pixel is greater than the amount of accumulated current having flowed through the second sub-pixel. During the image quality control period, the amount of current flowing through the second sub-pixel is greater than the amount of current flowing through the first sub-pixel.