Display Panel Light Shielding for Clear Fingerprint Imaging
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Solution Overview
Problem
Ambient light interference in fingerprint identification systems of display panels, particularly in narrow border designs, leads to blurred or impossible texture imaging, reducing the accuracy of fingerprint recognition.
Innovation Solution
Incorporating a light shielding portion on the display panel that shields the edge regions of photosensitive devices, allowing only signal light to be received by the photosensitive devices, thereby reducing ambient light interference and improving the optical Signal-to-Noise Ratio (SNR).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If photosensitive devices are integrated into the display panel for fingerprint identification, then fingerprint recognition function is added, but ambient light interference occurs causing blurred texture imaging
Solution Approach 1:
A light shielding portion is introduced as an intermediary element between the light source and the photosensitive device. This light shielding portion selectively blocks ambient light from reaching the photosensitive device while allowing the imaging light to pass through, thereby eliminating ambient light interference and restoring clear texture imaging capability
Solution Approach 2:
The light shielding portion is segmented into multiple light shielding regions corresponding to different photosensitive devices. Each light shielding region is positioned to shield only its corresponding photosensitive device, allowing selective blocking of ambient light while maintaining the functionality of individual fingerprint sensing elements
2Object-affected harmful factors
If the light shielding portion covers the entire photosensitive device, then ambient light is completely blocked, but signal light from the light emitting device cannot reach the photosensitive device
Solution Approach 1:
The light shielding portion exhibits local quality by having different regions with different light transmission properties. The first light shielding regions are positioned to block ambient light from reaching the photosensitive devices, while the second light shielding regions are configured to allow signal light from the light emitting devices to pass through to the photosensitive devices, achieving selective light control
3Area of stationary object
If the display panel uses narrow border design, then screen occupation ratio is increased, but ambient light interference in fingerprint identification is exacerbated
Solution Approach 1:
The light shielding portion serves as a mediator that resolves the conflict between narrow border design and fingerprint identification accuracy. By selectively blocking ambient light while allowing signal light to pass, it enables clear texture imaging even in the compact narrow border configuration, thus maintaining both high screen occupation ratio and accurate fingerprint recognition
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 the accuracy of fingerprint identification by effectively blocking ambient light, thus improving the SNR and ensuring clear texture imaging.
Implementation Method 1
a plurality of photosensitive devices located between a layer where the plurality of light emitting devices are located and the base substrate; wherein the plurality of photosensitive devices are configured to collect light emitted by the plurality of light emitting devices and reflected by a fingerprint
Implementation Method 2
a plurality of light emitting devices located on the base substrate
Implementation Method 3
a light shielding portion located on a light-incident side of the plurality of photosensitive devices, wherein an orthographic projection of the light shielding portion on the base substrate overlaps with edge regions of the orthographic projections of the photosensitive devices
Data Source
AI summary
A display panel includes a base substrate; light-emitting devices on the base substrate; photosensitive devices between a layer where the light-emitting devices are located and the base substrate, the photosensitive devices being configured to collect light emitted by the light emitting devices and reflected by a fingerprint, and orthographic projections of the photosensitive devices on the base substrate being located in gaps between orthographic projections of the light-emitting devices on the base substrate; and a light-shielding portion on a light-incident side of the photosensitive devices, an orthographic projection of the light-shielding portion on the base substrate overlapping with edge regions of the orthographic projections of the photosensitive devices, the light-shielding portion being provided with first openings, and the orthographic projections of the first openings on the base substrate overlapping with middle regions of the orthographic projections of the photosensitive devices.