Display substrate and display device
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Solution Overview
Problem
The sensitivity of under-screen fingerprint detection in OLED display panels is compromised by the shielding effect of metal traces, such as power signal lines, gate signal lines, and metal touch layers, which block the transparent/translucent film layer or light transmission gaps, affecting the accuracy of fingerprint detection.
Innovation Solution
The display substrate design includes a first metal signal line layer with metal connection signal lines parallel to the grid lines of a metal touch layer, reducing the shielding area and enhancing the sensitivity of under-screen fingerprint detection by minimizing overlap between these layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If metal connection signal lines are arranged perpendicular to grid lines of the metal touch layer, then electrical connectivity is ensured, but the shielding area increases and fingerprint detection sensitivity deteriorates
Solution Approach 1:
The patent merges the metal connection signal lines with the grid lines of the metal touch layer by making them parallel and overlapping. This combination allows the connection signal lines to utilize the same spatial pathway as the touch layer grid lines, thereby reducing the total shielding area without compromising electrical connectivity. The overlapping arrangement ensures that both the touch function and signal transmission function are achieved within the same structural footprint.
Solution Approach 2:
The patent transitions from a planar arrangement where connection lines intersect perpendicular to the grid lines to a three-dimensional overlapping arrangement where connection lines are parallel to and overlap with the grid lines. This dimensional change allows the connection signal lines to be positioned in a different spatial configuration that reduces their projected shielding area on the transparent/translucent film layer while maintaining electrical connectivity through vertical stacking.
2Measurement precision
If metal layers are arranged to ensure electrical connectivity, then device functionality is maintained, but the transparent/translucent film layer is blocked and fingerprint detection accuracy deteriorates
Solution Approach 1:
The patent combines the connection signal lines with the touch layer grid lines into a unified structure where they are parallel and overlapping. This merging reduces the cumulative metal coverage area that would otherwise block light transmission through the transparent/translucent film layer, thereby improving fingerprint detection accuracy while maintaining both touch and electrical connection functions.
Solution Approach 2:
The patent applies local quality by making the connection signal lines parallel to and overlapping with specific regions of the grid lines rather than having them intersect throughout. This localized arrangement optimizes light transmission in critical areas while maintaining electrical connectivity where needed, reducing the overall harmful shielding effect on fingerprint detection.
3Measurement precision
If metal connection signal lines are positioned to minimize shielding, then fingerprint detection sensitivity improves, but electrical connectivity between adjacent first metal signal lines may be compromised
Solution Approach 1:
The patent ensures electrical connectivity by merging the connection signal lines with the touch layer grid lines in a parallel overlapping configuration. This unified structure guarantees reliable electrical connection between adjacent first metal signal lines while simultaneously minimizing the shielding area, thus resolving the contradiction between connectivity reliability and detection sensitivity.
Solution Approach 2:
The patent uses three-dimensional overlapping arrangement where connection signal lines are positioned in a different vertical layer than the grid lines they overlap with. This dimensional separation ensures that electrical connectivity is maintained through the vertical stacking while the projected area on the transparent/translucent film layer is minimized, improving fingerprint detection sensitivity without compromising connectivity reliability.
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.