Display Substrate Power Line Segmentation for Optical Fingerprint Sensing
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Solution Overview
Problem
Optical fingerprint recognition technologies face challenges in display substrates due to high opaque area coverage by metal conductors and P—Si semiconductors, which reduces signal-to-noise ratio and limits fingerprint detection speed and accuracy.
Innovation Solution
The display substrate design includes a power signal line pattern with a first and second power line portion, arranged in a specific configuration to create an aperture, reducing the opaque area and improving light transmittance, thereby enhancing fingerprint recognition speed and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal conductors and P-Si semiconductors are used to form circuit patterns in display substrates, then electrical connectivity and device functionality are achieved, but the opaque area coverage increases, reducing light transmittance and fingerprint recognition accuracy
Solution Approach 1:
The power signal line pattern is divided into multiple segments (first power line portion, second power line portion with main body, first end portion, and second end portion) with apertures formed between them. This segmentation reduces the continuous opaque area while maintaining electrical connectivity through the distributed line portions, directly addressing the contradiction between functionality and light transmittance
Solution Approach 2:
The power signal line pattern incorporates apertures (open spaces) between the first and second power line portions, creating a porous structure at the micro level. This allows light to pass through the areas where traditional solid metal conductors would block it, improving light transmittance while the metal portions maintain necessary electrical connections
2Reliability
If metal conductors and semiconductors cover large areas in the display substrate, then sufficient electrical pathways are provided, but the signal-to-noise ratio for optical fingerprint sensors deteriorates
Solution Approach 1:
By segmenting the power signal line into distributed portions with apertures between them, the invention reduces the continuous opaque area that interferes with optical fingerprint sensing. The segmented structure maintains electrical connectivity through multiple connection points while minimizing the blocking effect on light signals used for fingerprint detection
Solution Approach 2:
The apertures act as intermediary spaces between the metal conductor portions, allowing optical signals to pass through the substrate more effectively. These intermediate open areas reduce the interference between the electrical conductors and the optical fingerprint sensing process, improving measurement precision
3Ease of manufacture
If traditional power signal line patterns are used in display substrates, then manufacturing simplicity is maintained, but fingerprint recognition speed and accuracy are limited
Solution Approach 1:
The power signal line pattern is segmented into portions with apertures, which can be formed using standard photolithography and etching processes. This segmentation approach maintains compatibility with existing manufacturing workflows while significantly improving light transmittance and fingerprint recognition performance, thus not sacrificing manufacturing simplicity
Data Source
AI summary
A display substrate and a method for manufacturing the same, and a display device. Each sub-pixel in the display substrate includes a power signal line pattern. The power signal line pattern includes a first power line portion and a second power line portion; a main body portion of the second power line portion and the first power line portion are arranged in a first direction and are spaced apart from each other; a first end portion of the second power line portion is respectively coupled with one end of the main body portion and the first power line portion; the second end portion is respectively coupled with the other end of the main body portion and the first power line portion; an aperture is defined between the first power line portion and the second power line portion.