Display Substrate Layout for Fingerprint Light Transmission
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Solution Overview
Problem
Display apparatuses with Fingerprint on Display function suffer from low fingerprint identification sensitivity.
Innovation Solution
A display substrate design with a light shielding layer and strategically positioned light transmission holes, optimized to enhance fingerprint identification sensitivity and resolution, incorporating specific signal lines and pixel circuit structures to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fingerprint identification module is integrated into the display panel, then the Fingerprint on Display function is achieved, but the fingerprint identification sensitivity is relatively low
Solution Approach 1:
The display panel is segmented into different functional regions: a display region with sub-pixels for normal display function, and a fingerprint recognition region with light transmission holes for fingerprint identification. This segmentation allows each region to optimize its specific function without interfering with the other, thereby improving fingerprint identification sensitivity while maintaining display functionality.
Solution Approach 2:
The light shielding layer is designed with local quality variations: it is light-shielding in most areas to block ambient light and improve display contrast, but contains light transmission holes in the fingerprint recognition region to allow light to pass through for fingerprint sensing. This local differentiation of light transmission properties enables high fingerprint identification sensitivity while maintaining overall display performance.
2Reliability
If light transmission holes are provided in the light shielding layer, then fingerprint identification sensitivity is improved, but the pixel circuit structure may obstruct the light transmission
Solution Approach 1:
The light transmission holes are pre-positioned in the light shielding layer during the manufacturing process, before the pixel circuit structures are fully assembled. The design ensures that the light transmission holes are located in regions that will not be obstructed by pixel circuit elements, thereby guaranteeing light transmission paths for fingerprint recognition while maintaining manufacturing feasibility.
Solution Approach 2:
The patent addresses the positioning challenge by considering the vertical stacking arrangement of different layers. The light transmission holes are positioned in the light shielding layer at a vertical level where they do not overlap with pixel circuit structures in adjacent layers, effectively using the vertical dimension to resolve the horizontal positioning conflict and ensure unobstructed light transmission.
3Reliability
If the light transmission hole is positioned within the region enclosed by signal lines, then fingerprint identification sensitivity is improved, but the resolution may be affected
Solution Approach 1:
The display panel is designed with local quality differentiation where the light transmission holes are positioned in specific regions enclosed by signal lines that do not correspond to active pixel areas. This allows the fingerprint recognition function to utilize light transmission in non-display regions, improving sensitivity without compromising the resolution and quality of the displayed image.
Solution Approach 2:
The display panel is segmented into display regions and fingerprint recognition regions. The light transmission holes are specifically positioned in the fingerprint recognition region, which is enclosed by signal lines but does not overlap with active pixel elements. This segmentation ensures that fingerprint identification sensitivity is improved while display resolution is maintained in the display regions.
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
The design achieves high fingerprint identification sensitivity and high resolution by ensuring light transmission holes are not obstructed by pixel circuit elements, thereby improving the fingerprint identification process.
Implementation Method 1
a light shielding layer, located between the pixel circuit structure and the base substrate, wherein a light transmission hole is provided in the light shielding layer
Data Source
AI summary
A display substrate includes a base substrate, including a display region; multiple sub-pixels including first sub-pixels and second sub-pixels adjacent along a first direction, located in the display region, each including a pixel circuit structure; a light-shielding layer, located between the pixel circuit structure and the base substrate, provided with a light transmission hole; a first initialization signal line and a light emitting control signal line extending along the first direction; a first power supply line, extending along a second direction; a first data line, extending along the second direction, connected with the pixel circuit structure of the first sub-pixel; and a second data line, extending along the second direction, connected with the pixel circuit structure of the second sub-pixel; the hole is located within a region enclosed by the first power supply line, the second data line, the light emitting control signal line, and the first initialization signal line.