Display Panel Power Line Layout to Reduce IR-Drop Brightness Variation
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Solution Overview
Problem
In display panels, power signal IR drops result in inconsistent brightness and poor brightness uniformity across different positions, affecting the display effect.
Innovation Solution
The display panel design includes a power line with an extension part in the bending area and a body part in the non-display area, positioned to minimize voltage drop differences by adjusting the distance between the extension part and boundaries, ensuring equal distances to centerlines, thereby improving brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the power line is positioned in the conventional location (closer to the centerline), then the manufacturing process is simple, but the brightness uniformity deteriorates due to IR drop
Solution Approach 1:
The power line is intentionally positioned asymmetrically relative to the display area boundaries, with different distances to opposite boundaries. This asymmetric positioning compensates for the IR drop effect by placing the power line closer to boundaries where voltage drop is more severe, thereby achieving improved brightness uniformity across the display area.
Solution Approach 2:
The power line positioning is optimized locally for different regions of the display area. By setting different distances to different boundaries based on the specific IR drop characteristics of each region, the solution achieves locally adapted voltage compensation, improving overall brightness uniformity.
2Manufacturing precision
If the extension part is positioned closer to one boundary, then the brightness uniformity improves, but the distance to the other boundary increases causing voltage drop
Solution Approach 1:
The positioning parameters of the power line (specifically the distances to opposite boundaries) are optimized to achieve the desired brightness uniformity. By carefully selecting these geometric parameters, the solution balances the trade-off between improving brightness uniformity and minimizing voltage drop to pixel circuits.
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
The solution reduces brightness differences across the display area, enhancing overall brightness uniformity and improving the display effect by minimizing voltage drops.
Implementation Method 1
a power line configured to provide a power signal to the plurality of pixels in the display area
Data Source
AI summary
A display panel includes a display area, a non-display area surrounding the display area and including a bending area, and a power line that includes an extension part located at least partially in the bending area and a body part located in the non-display area and electrically connected to the extension part. The body part is located between the bending area and the display area. The display area includes first and second boundaries opposite to each other in a first direction, and a centerline extending in a second direction pointing from the display area to the bending area and intersecting the first direction. In the first direction, a minimum distance between the extension part and the first boundary is smaller than a minimum distance between the extension part and the second boundary and is smaller than or equal to a minimum distance between the extension part and the centerline.