Display Substrate Power-Line Layout for Narrow-Bezel OLED Panels
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Solution Overview
Problem
In OLED display products, the traditional fan-out structure for signal lines leads to a wide frame region, which obstructs the pursuit of narrow frames and full-screen displays, as the signal lines need to be led out to a fan-out region and connected to an IC, resulting in a non-display frame area that hinders visual performance.
Innovation Solution
A display substrate design with a power voltage lead and line configuration that extends along the edges of the display region, allowing for direct power voltage distribution to sub-pixels without extending into the middle regions, reducing the need for additional wiring and frame area, and utilizing a mesh-shaped auxiliary power voltage line in the frame corner region to minimize voltage drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal lines are led out to a fan-out region and connected to an IC through the fan-out region, then reliable electrical connection is achieved, but the frame width increases and display area decreases
Solution Approach 1:
The display substrate is divided into a display region and a non-display region, with further segmentation into edge display regions and middle display regions. This segmentation allows different wiring strategies to be applied in different regions, enabling the frame width to be reduced while maintaining reliable connections through targeted routing in edge regions.
Solution Approach 2:
The power voltage lines are configured to extend in both longitudinal and transverse directions, creating a two-dimensional wiring network. This dimensional approach allows voltage distribution without requiring a large fan-out region, as the lines can reach sub-pixels through multiple pathways across the display surface.
2Reliability
If power voltage lines extend along the entire lower edge including the middle display region, then complete voltage distribution is achieved, but the frame width increases
Solution Approach 1:
Different regions of the display substrate are assigned different wiring characteristics. Edge display regions receive direct voltage supply through edge voltage lines connected to the lower lead, while middle display regions use voltage lines that are spaced apart from the lower lead. This local differentiation achieves complete voltage distribution without extending wiring throughout the entire lower edge.
Solution Approach 2:
The voltage distribution system adapts to different regional requirements dynamically. Edge voltage lines provide direct connection where needed, while middle voltage lines maintain spacing to reduce interference. This dynamic configuration optimizes both voltage distribution effectiveness and frame width reduction.
3Reliability
If the lower lead extends along the entire lower edge, then all sub-pixels receive power voltage, but the fan-out region area increases
Solution Approach 1:
The lower lead is segmented to extend only along portions of the lower edge corresponding to edge display regions, not the entire lower edge. This segmentation reduces the fan-out region area while maintaining reliable power supply to all sub-pixels through the combination of edge voltage lines and middle voltage lines that distribute voltage to their respective regions.
4Object-affected harmful factors
If voltage lines are spaced apart from the lower lead in the middle display region, then interference is reduced, but voltage distribution efficiency decreases
Solution Approach 1:
The voltage distribution system uses a two-dimensional network of edge voltage lines and middle voltage lines that extend in both longitudinal and transverse directions. This multi-dimensional approach compensates for the spacing between middle voltage lines and the lower lead, maintaining voltage distribution efficiency through alternative pathways while reducing interference through spatial separation.
Data Source
AI summary
Disclosed are a display substrate and a display device. In the display substrate, a first power voltage lead is configured to provide a first power voltage and located in the frame region; the first power voltage lead includes a lower lead extending along a portion of the lower edge corresponding to the first edge display region, but does not extend along a portion of the lower edge corresponding to the first middle display region; a first power voltage line includes an edge voltage line located in the first edge display region and a middle voltage line located in the first middle display region; the edge voltage line is directly connected with the lower lead to provide a first power voltage to sub-pixels located in the first edge display region, and the middle voltage line is spaced apart from the lower lead.