Display Touch Layer Light Conversion for Accurate Fingerprint Sensing
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Solution Overview
Problem
Existing display devices face challenges in accurately integrating touch and fingerprint recognition sensors, particularly in enhancing the accuracy of fingerprint recognition by concentrating light on the fingerprint sensing area.
Innovation Solution
A display device with a touch sensing layer that includes a first insulating layer containing a light-converting material to convert light into near-infrared light, allowing for improved fingerprint recognition accuracy by reflecting user fingerprints as near-infrared light on the light-sensing area, and a second insulating layer with a thickness of 5 μm to 10 μm for enhanced resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light-converting material is added to convert light into near-infrared light, then fingerprint sensing accuracy is improved, but device structure complexity increases
Solution Approach 1:
The patent combines the light-converting function with the insulating layer by incorporating light-converting materials (quantum dots, colorants, or metal composites) into the insulating layer material. This merging eliminates the need for separate light-converting layers while achieving near-infrared light generation for fingerprint sensing, thus improving accuracy without proportionally increasing structural complexity
Solution Approach 2:
The insulating layer is given multiple functions: it provides electrical insulation between conductive layers and simultaneously converts visible light into near-infrared light for fingerprint detection. This multi-functionality reduces the need for additional dedicated layers, balancing improved sensing accuracy with manageable device complexity
2Measurement precision
If the second insulating layer thickness is increased to 5 μm to 10 μm, then fingerprint detection resolution is improved, but light transmittance may be reduced
Solution Approach 1:
The patent optimizes the thickness parameter of the second insulating layer within a specific range (5 μm to 10 μm) to achieve the desired balance between resolution and transmittance. By controlling the thickness within this range, the layer provides sufficient resolution for fingerprint detection while maintaining adequate light transmittance for the fingerprint sensing function
3Measurement precision
If light is concentrated on the fingerprint sensing area, then fingerprint recognition accuracy is improved, but light emission efficiency may be reduced
Solution Approach 1:
The patent applies light-converting materials specifically in regions where fingerprint sensing is required, rather than uniformly across the entire display. This localized application concentrates the light-converting effect on the fingerprint sensing area, improving recognition accuracy while minimizing the impact on overall light emission efficiency of the display
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 improves fingerprint recognition accuracy by converting light into near-infrared light for enhanced sensing and maintains light transmittance, thereby improving the overall resolution and accuracy of fingerprint detection.
Implementation Method 1
the first insulating layer includes a light-converting material that converts light into near-infrared light
Data Source
AI summary
A display device including: a substrate; a plurality of light-emitting elements on the substrate; and a touch sensing layer disposed on the plurality of light-emitting elements, wherein the touch sensing layer includes: a first touch conductive layer; a first insulating layer disposed on the first touch conductive layer; and a second touch conductive layer disposed on the first insulating layer, and wherein the first insulating layer includes a light-converting material that converts light into near-infrared light.