Display Panel Filter Layer for Reduced Leakage in Fingerprint Sensing
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Solution Overview
Problem
Existing display devices with optical fingerprint recognition face issues such as light leakage and warpage due to insufficient sealing at component edges, leading to reduced assembly yield and increased overall thickness, which affect the accuracy and reliability of fingerprint recognition.
Innovation Solution
Integrate a filter layer with a filtering function on the backside of the display panel, stacking the photosensitive imaging device away from the display side, eliminating the need for additional attachment of a filtering function layer on the prism, thereby reducing assembly complexities and thickness while enhancing recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a filtering function layer is separately attached on the prism, then fingerprint recognition accuracy is improved, but device complexity and assembly steps increase
Solution Approach 1:
The patent merges the filtering function into the display panel structure itself by forming a filter layer at the backside of the display panel. This integration eliminates the need for separately attaching a filtering function layer on the prism, thereby reducing assembly complexity while maintaining fingerprint recognition accuracy through effective light filtering.
2Object-affected harmful factors
If multiple components are attached separately, then filtering function is achieved, but overall thickness increases
Solution Approach 1:
The patent combines multiple functional layers into an integrated structure where the filter layer is formed at the backside of the display panel. This merging approach achieves effective light filtering to prevent light leakage while minimizing overall thickness by eliminating redundant separate components.
3Ease of manufacture
If insufficient sealing at component edges is used, then assembly is easier, but light leakage occurs reducing recognition accuracy
Solution Approach 1:
The patent integrates the filtering function into the display panel's backside structure, creating a unified component that eliminates interfaces between separate filtering layers and the prism. This integration inherently improves sealing at edges, preventing light leakage while maintaining ease of assembly through reduced component count.
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
This configuration improves assembly yield, reduces light leakage, and minimizes overall thickness, resulting in enhanced fingerprint recognition accuracy and reliability by effectively filtering interference light.
Implementation Method 1
a filter layer having a filtering function, and a photosensitive imaging device stacked with the display panel and located at a side of the filter layer facing away from the display side
Data Source
Figure 1A~1B
Figure 1C~2
Figure 3~4
AI summary
A display device and a manufacturing method thereof are provided. The display device (100) includes a display panel (110) and a photosensitive imaging device (130). The display panel (110) includes a display side (111) and a backside (111) opposite to the display side (112), and the display panel (110) further includes a filter layer (120) disposed at the back side (112) of the display panel (110). The photosensitive imaging device (130) is stacked with the display panel (110) and located at a side of the filter layer (120) facing away from the display side (111), and the photosensitive imaging device (130) is configured to detect a skin texture image of a user touching the display panel. The display device (100) reduces attaching processes between components and improves the assembly yield of each component.