OLED Scan Line Load Compensation for Uniform Brightness
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Solution Overview
Problem
Organic light emitting display devices face challenges in maintaining uniform brightness across different regions due to varying load values on wire lines, leading to non-uniform image display.
Innovation Solution
The display device incorporates a substrate with regions of different sizes and shapes, featuring a dummy unit that compensates for load value differences by adding parasitic capacitance to scan lines, ensuring consistent load values across all regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If wire lines have different lengths in different regions, then the display device can cover a larger area, but the load values on wire lines become non-uniform causing brightness inconsistency
Solution Approach 1:
The patent applies local quality by configuring different wire line structures in different regions. Specifically, the first wire lines in the first region have a first line width while the second wire lines in the second region have a second line width different from the first, allowing each region to be optimized for its specific requirements while maintaining overall brightness uniformity
Solution Approach 2:
The patent changes physical parameters of the wire lines by adjusting line width and/or layer configuration in different regions. This parameter modification compensates for the different lengths of wire lines, ensuring that load values remain substantially equal across all regions despite area expansion
2Manufacturing precision
If wire line lengths are equalized across regions, then brightness uniformity is improved, but the display area that can be covered is reduced
Solution Approach 1:
Rather than uniform wire line configuration, the patent implements local quality by allowing different wire line characteristics (line width, layer structure) in different regions, enabling area expansion while maintaining brightness uniformity through region-specific optimization
Solution Approach 2:
The patent addresses the length difference problem by transitioning to another dimension - modifying the wire line configuration in the vertical dimension (multiple layers) and lateral dimension (line width) rather than simply adjusting length, thus enabling area expansion without compromising brightness uniformity
3Manufacturing precision
If different line widths are used in different regions, then load values can be equalized, but the device structure becomes more complex
Solution Approach 1:
The patent applies local quality by configuring different wire line structures in different regions. Specifically, the first wire lines in the first region have a first line width while the second wire lines in the second region have a second line width different from the first, allowing each region to be optimized for its specific requirements while maintaining overall brightness uniformity
Solution Approach 2:
The patent achieves equipotentiality in terms of electrical load by designing the wire line parameters (width, layers) such that all wire lines have substantially equal load values despite different lengths and regions, ensuring uniform voltage distribution and brightness across the display
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 solution achieves uniform brightness across the display area by adjusting load values, reducing brightness deviations and enhancing image quality.
Implementation Method 1
The display device includes a dummy unit configured to compensate for differences in load values of the scan lines in the pixel regions
Data Source
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AI summary
A display device includes a substrate including a first pixel region and a second pixel region having a smaller area than the first pixel region. The second pixel region is connected to the first pixel region. A first pixel is provided in the first pixel region and a second pixel is provided in the second pixel region. A first line is connected to the first pixel and a second line is connected to the second pixel. A dummy unit overlaps at least one of the first line and the second line, and compensates for a difference in load values between the first and second lines.