Display Substrate Metal Pattern Stacking for Fingerprint Transmittance
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Solution Overview
Problem
Existing display substrates with metal patterns have low transmittance due to opaque metal lines, leading to reduced light transmission and decreased precision in fingerprint identification.
Innovation Solution
A display substrate design with metal patterns arranged in different layers, where the orthographic projection of one pattern overlaps with the other, improving transmittance and allowing for even distribution of light-transmitting regions, and a fingerprint identification module with a collimating film and photosensitive sensors to filter scattered light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If metal patterns are arranged in the same layer on the display substrate, then the electrical connection is simple, but the light transmittance is low due to overlapping opaque metal lines blocking the light path
Solution Approach 1:
The patent transitions from two-dimensional planar arrangement of metal patterns to three-dimensional stacked arrangement across multiple layers. The first and second metal patterns are positioned in different layers with their orthographic projections overlapping on the base substrate, allowing light to pass through the gaps between stacked patterns rather than being blocked by overlapping patterns in the same layer.
2Illumination intensity
If metal patterns are arranged in different layers with overlapping projections, then the light transmittance is improved, but the electrical connection complexity increases
Solution Approach 1:
The patent merges the electrical connection functions by making the second metal pattern electrically connected to the first metal pattern through direct contact or conductive structures in the intermediate layer. This integration reduces the need for additional separate connection elements, thereby managing complexity while achieving multi-layer arrangement for improved light transmittance.
3Reliability
If opaque metal lines are used for signal transmission, then the electrical conductivity is high, but the fingerprint identification precision is reduced due to light blocking and information loss
Solution Approach 1:
By arranging metal patterns in multiple stacked layers with overlapping projections, the patent creates vertical separation that allows light to pass through the horizontal gaps between layers. This maintains the electrical conductivity function of metal patterns while reducing their harmful light-blocking effect, thereby preserving fingerprint identification precision.
Solution Approach 2:
The patent optimizes the local arrangement of metal patterns by creating specific gap regions between stacked patterns where light can pass through. These localized light-transmitting regions are strategically positioned to maintain electrical connectivity where needed while allowing light transmission in fingerprint sensing areas, thus balancing conductivity and identification precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances light transmission through the display substrate, improving fingerprint identification precision and image sharpness by increasing the intensity of light received by the fingerprint identification module.
Implementation Method 1
the collimating film is configured to transmit light reflected by a fingerprint and filter out scattered light in the reflected light to cause the transmitted light through the collimating film to become the collimated light
Data Source
AI summary
A display substrate, a fingerprint identification panel, a fingerprint identification method and a display device are provided. The display substrate includes a first metal pattern and a second metal pattern arranged on a base substrate and in different layers. An orthographic projection of the first metal pattern on the base substrate at least partially overlaps with an orthographic projection of the second metal pattern on the base substrate, and one of the first metal pattern and the second metal pattern is a supply voltage signal line.