OLED Display Brightness Uniformity Compensation via Elongation Sensing
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Solution Overview
Problem
Flexible and elongatable OLED devices face issues with uniform brightness due to elongation, which affects image quality as the distance between pixels increases, leading to reduced pixel density and potential dimness in elongated areas.
Innovation Solution
The OLED device incorporates a substrate with island and bridge patterns, sensing lines, and a sub-drive voltage line system that compensates for elongation by adjusting data signals and power supply to maintain uniform brightness, using protrusions on sensing and sub-drive voltage lines to ensure consistent illumination across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the OLED device is made flexible and elongatable, then adaptability and versatility are improved, but uniformity of brightness deteriorates
Solution Approach 1:
The sensing lines are designed with movable protrusions that can dynamically adjust their position and contact status based on the elongation state of the substrate. When the substrate elongates, the protrusions move and change contact status, allowing the system to adapt to different elongation states and maintain uniform brightness through dynamic compensation.
Solution Approach 2:
The sensing lines with protrusions provide feedback about the substrate's elongation state to the sub-drive voltage line system. This feedback mechanism enables the system to detect elongation and automatically adjust the data signals and power supply accordingly, maintaining uniform brightness across the display area.
2Adaptability or versatility
If the distance between pixels increases due to elongation, then adaptability is improved, but pixel density decreases leading to reduced brightness
Solution Approach 1:
The system changes the electrical parameters (voltage and current) of the sub-drive voltage lines based on the detected elongation state. By adjusting these parameters dynamically, the system compensates for the reduced pixel density caused by elongation, maintaining consistent illumination intensity across the display area.
3Measurement precision
If sensing lines are designed with protrusions to detect elongation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sensing lines are segmented into multiple sections with protrusions at specific locations. This segmentation allows the system to detect elongation at multiple points, improving measurement precision while keeping each individual sensing line segment relatively simple in structure.
Data Source
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AI summary
Provided herein may be a display device. The display device may include a substrate, a base layer, a first protrusion and a second protrusion. The substrate may include a pixel area, and a peripheral area surrounding the pixel area. The base layer may be disposed on the pixel area, and include a plurality of island patterns on which respective pixels are provided, and a plurality of bridge patterns coupling the adjacent island patterns to each other, the plurality of island patterns and the plurality of bridge patterns disposed on the first area. The first protrusion and the second protrusion may be provided on the base layer.