Multilayer Cover Layer for In-Screen Fingerprint Sensors
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Solution Overview
Problem
Current in-screen fingerprint recognition technology is hindered by thick cover layers, which reduce the sensitivity of fingerprint sensors in display devices.
Innovation Solution
A display device with a thinner multilayer cover layer structure formed through coating and adhesion processes, enhancing sensor sensitivity while providing protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cover layer of the display panel is made thick, then the protection function is improved, but the sensitivity of fingerprint sensors is reduced
Solution Approach 1:
The cover layer is divided into multiple sub-layers (first cover layer, second cover layer, third cover layer) with different thicknesses and materials. The first cover layer has greater thickness for protection, while the second and third cover layers have smaller thicknesses to minimize impact on fingerprint sensor sensitivity, resolving the contradiction between protection and sensitivity.
Solution Approach 2:
Different regions of the cover layer structure have different properties: the first cover layer uses a material with a refractive index closer to air and greater thickness for protection, while the second and third cover layers use materials with smaller thicknesses optimized for fingerprint sensing performance, achieving local optimization of both protection and sensitivity.
2Measurement precision
If the cover layer is made thin, then the sensitivity of fingerprint sensors is improved, but the protection function is reduced
Solution Approach 1:
The cover layer is segmented into multiple functional layers where the first cover layer provides primary protection with greater thickness, while the second and third cover layers provide additional protection with smaller thicknesses, collectively achieving both protection and sensor sensitivity.
Solution Approach 2:
The multilayer cover layer structure uses different materials with different refractive indices and mechanical properties. The first cover layer material has a refractive index closer to air, while the second and third cover layers use different materials, creating a composite structure that balances protection and optical performance for fingerprint sensing.
Data Source
AI summary
A display device includes a display panel, a sensing layer disposed on the display panel and including a fingerprint sensor, an optical layer disposed on the display panel, and a cover layer disposed on the optical layer, wherein the cover layer is a multilayer structure.