Display Panel Scan Line Layout for O-Cut Load Uniformity
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Solution Overview
Problem
The load of signal lines in the O-cut area of display devices is inconsistent with the load of signal lines in other areas, leading to uneven display.
Innovation Solution
The display panel design includes a pixel driving circuit with transistors connected in specific configurations, and scanning signal lines are arranged to pass through a hole-digging area in a manner that ensures consistent impedance with other areas by connecting parts of the signal lines through extension lines, using multiple metal layers to achieve uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If signal lines are combined into one wiring to bypass the O-cut area, then the border of the O-cut area is reduced and screen ratio is increased, but the load of signal lines in the O-cut area becomes inconsistent with other areas, resulting in uneven display
Solution Approach 1:
The signal line is divided into multiple segments (first part, second part, third part) that are distributed across different metal layers. The first part is in the first metal layer, the second part is in the second metal layer, and the third part connects them through via holes. This segmentation allows the signal line to bypass the O-cut area while maintaining consistent electrical characteristics and load across different regions of the display panel.
Solution Approach 2:
The signal line routing is moved from a single-plane configuration to a multi-layer three-dimensional structure. By utilizing multiple metal layers (first metal layer, second metal layer) and vertical connections (via holes), the signal line can bypass the O-cut area in the horizontal direction while maintaining consistent electrical path length and impedance, thereby achieving both high screen ratio and uniform display.
2Length of stationary object
If signal lines are combined into one wiring to bypass the O-cut area, then the border of the O-cut area is reduced, but the load inconsistency causes split screen phenomenon
Solution Approach 1:
The signal line is segmented into multiple parts across different metal layers, with each segment carefully designed to maintain consistent electrical characteristics. The first part, second part, and third part are distributed across the first and second metal layers, ensuring that the total path length and impedance remain consistent with signal lines in other areas, thereby preventing the split screen phenomenon while reducing the O-cut border.
Solution Approach 2:
The electrical parameters (path length, impedance, capacitance) of the signal line bypassing the O-cut area are adjusted and optimized by distributing it across multiple metal layers. By changing the physical configuration from a single-plane route to a multi-layer route, the electrical characteristics are made consistent with other signal lines, eliminating the load inconsistency that causes display quality issues.
Data Source
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AI summary
A display panel and a display device are provided by the present application. A first part and a second part of part of a first scanning signal line are connected through a third part, and/or a fourth part and a fifth part of part of a third scanning signal line are connected through a sixth part, so that a load of a hole-digging area is similar or even consistent with a load of other areas, thereby improving a display effect.