Display Substrate Touch-Grid Alignment to Reduce Optical Shielding
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Solution Overview
Problem
The presence of metal traces in OLED display substrates obstructs the transparent/translucent film layer or light transmission gaps, affecting the sensitivity of under-screen fingerprint detection.
Innovation Solution
The display substrate design includes metal connection signal lines parallel to and overlapping with the grid lines of the metal touch layer, reducing the shielding area and enhancing under-screen fingerprint detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal traces are used in OLED display substrates, then electrical connectivity and signal transmission are achieved, but the transparent/translucent film layer or light transmission gaps are obstructed, reducing under-screen fingerprint detection sensitivity
Solution Approach 1:
The patent transitions from traditional planar metal trace layouts to a three-dimensional stacked architecture where metal connection signal lines are positioned in different layers (first metal signal line layer and second metal signal line layer) separated by an insulating layer. This vertical stacking allows metal traces to connect to touch electrode regions while minimizing horizontal obstruction of light transmission gaps, thereby maintaining electrical connectivity without compromising fingerprint detection sensitivity
Solution Approach 2:
The metal connection signal lines are segmented into multiple sections across different layers. The first metal signal line layer contains metal traces that connect to first touch electrode regions, while the second metal signal line layer contains metal traces that connect to second touch electrode regions. This segmentation allows independent optimization of each layer's routing to minimize light obstruction while ensuring comprehensive electrical connectivity
2Reliability
If metal traces are positioned to ensure electrical connectivity, then signal transmission is reliable, but the shielding area increases, reducing under-screen fingerprint detection sensitivity
Solution Approach 1:
By moving metal traces from a single planar layer to multiple stacked layers, the patent reduces the horizontal footprint of metal traces. The insulating layer separates the first and second metal signal line layers vertically, allowing metal traces to be distributed across different z-heights rather than competing for the same x-y plane space. This dimensional transition reduces the total shielding area while maintaining signal transmission reliability
Solution Approach 2:
The multi-layer metal signal line structure serves multiple functions simultaneously: it provides electrical connectivity for touch sensing, maintains structural integrity of the display substrate, and minimizes light obstruction for fingerprint detection. The insulating layer between metal layers also serves as a mechanical support and electrical isolation barrier, demonstrating multi-functionality that reduces overall shielding area
Data Source
AI summary
A display substrate and a display device. The display substrate includes a base substrate, a first metal signal layer and a metal touch layer. The first metal signal line layer includes a plurality of first metal signal lines extending along a first direction, a plurality of metal connection signal lines are included between every two adjacent first metal signal lines. The metal touch layer includes a plurality of grid lines which are intersected. At least one part of each of the plurality of metal connection signal lines is parallel to the plurality of grid lines of the metal touch layer, and in a direction perpendicular to the base substrate, the part of each of the plurality of metal connection signal lines parallel to the plurality of grid lines of the metal touch layer is overlapped with the plurality of grid lines of the metal touch layer.