Segmented Light Shielding Layer for Foldable Display Fingerprint Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display devices with fingerprint recognition capabilities face challenges in accurately sensing fingerprints due to issues with light interference and stress distribution during folding, which affect the accuracy and sensitivity of fingerprint recognition.
Innovation Solution
Incorporating a light shielding layer with strategically placed holes and cut portions in the display panel to control the incident angle of light to the fingerprint sensor, reducing stress and enhancing the flexibility of the device while maintaining image quality and improving fingerprint recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light shielding layer is added to control light incidence for fingerprint recognition, then fingerprint recognition accuracy is improved, but device structure becomes more complex
Solution Approach 1:
The light shielding layer is segmented with multiple holes and cut portions strategically distributed across the layer. These segments allow selective light transmission to the fingerprint sensor while maintaining overall light shielding functionality, improving fingerprint recognition accuracy without requiring a completely opaque structure
Solution Approach 2:
Different regions of the light shielding layer have different properties: areas with holes and cut portions allow light transmission for fingerprint sensing, while other areas maintain light shielding for display quality. This local differentiation optimizes both fingerprint recognition accuracy and image quality
2Adaptability or versatility
If the display panel is made flexible for folding, then adaptability is improved, but stress distribution during folding affects fingerprint recognition accuracy
Solution Approach 1:
The light shielding layer is divided into multiple segments through holes and cut portions, which act as stress relief points. This segmentation allows the layer to flex during device folding without generating excessive stress that would compromise fingerprint sensor performance
Solution Approach 2:
The light shielding layer is designed as a thin, flexible film structure that can accommodate bending and folding. The holes and cut portions in this thin film reduce stress concentration during folding, maintaining the layer's ability to function as both a light shield and a flexible component
3Stress or pressure
If holes and cut portions are added to the light shielding layer, then stress is reduced during folding, but light transmission control becomes more complex
Solution Approach 1:
The light shielding layer is segmented with holes and cut portions that serve dual purposes: reducing stress during folding and controlling light transmission. The segmentation simplifies stress management while the strategic placement of segments maintains light transmission control for both display and fingerprint sensing
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 solution enhances the accuracy and sensitivity of fingerprint recognition by controlling light incidence and reducing stress on the light shielding layer during folding, thereby improving the overall performance of the display device's biometric authentication capabilities.
Implementation Method 1
Inclining the plurality of holes to a first direction and the cut portion to a second direction in a light shielding layer, thereby controlling an incident angle of light incident to the fingerprint sensor
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
Provided is a display device including a display panel defining a folding area and a non-folding area and including a base layer, a circuit layer on the base layer, and a display element layer on the circuit layer, an input sensor below the display panel and defining a sensing area overlapping the non-folding area, and a light shielding layer between the display element layer and the input sensor, where the light shielding layer defines a plurality of holes in a first portion of the light shielding layer at the non-folding area, and a cut portion in a second portion of the light shielding layer at the folding area.