Touch Layer Reflectivity for Fingerprint Sensitivity
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Solution Overview
Problem
Existing display devices with fingerprint identification functions suffer from low sensitivity due to limited light transmission through imaging apertures, which affects the accuracy and reliability of fingerprint identification.
Innovation Solution
A display panel design that includes a light-blocking layer with imaging apertures, a light-emitting device layer, and a touch function layer with distinct first and second touch areas, where the second touch area has lower reflectivity or higher transmittance than the first, ensuring more light is transmitted through the imaging apertures to the fingerprint identification module, thereby enhancing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch function layer is provided over the light-blocking layer with imaging apertures, then touch functionality is achieved, but light transmission to the fingerprint identification module is blocked, reducing identification sensitivity
Solution Approach 1:
The touch function layer is designed with different reflectivity regions: a first region with higher reflectivity and a second region with lower reflectivity that corresponds to the imaging aperture areas. This local differentiation allows the touch layer to maintain overall touch functionality while creating light transmission pathways through the low-reflectivity second region, enabling fingerprint identification light to pass through to the sensing module below.
2Reliability
If the touch function layer has high reflectivity for touch detection, then touch sensitivity is improved, but light from the fingerprint identification module is reflected away from the imaging apertures, reducing identification accuracy
Solution Approach 1:
The touch function layer incorporates spatially varying reflectivity properties, with the second region having lower reflectivity specifically positioned over the imaging aperture identification areas. This allows different regions of the same layer to serve different functions: the first region maintains high reflectivity for touch detection, while the second region allows light transmission for fingerprint identification.
Solution Approach 2:
The touch function layer is segmented into functionally distinct regions: a first region for touch detection with higher reflectivity and a second region for light transmission with lower reflectivity. This segmentation allows the layer to simultaneously fulfill both touch detection and optical transmission requirements without compromising either function.
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 design improves the sensitivity and accuracy of fingerprint identification by increasing the light flux and uniformity received by the fingerprint identification module, while minimizing interference from the touch function layer.
Implementation Method 1
The light-blocking layer includes a plurality of imaging apertures
Implementation Method 2
A reflectivity of the second touch area is smaller than a reflectivity of the first touch area; or a transmittance of the second touch area is greater than a transmittance of the first touch area
Implementation Method 3
the second touch area overlaps with at least one of the imaging aperture identification areas
Implementation Method 4
The fingerprint identification module is configured to receive first reflected light reflected through the light-blocking layer by a touch body
Data Source
AI summary
Provided are a display panel and a display device. The display panel includes a fingerprint identification module, a light-blocking layer, a light-emitting device layer and a touch function layer which are sequentially stacked, where the light-blocking layer includes a plurality of imaging apertures; and the touch function layer includes a plurality of first touch areas and a plurality of second touch areas. The plurality of first touch areas do not overlap with imaging aperture identification areas, and the plurality of second touch areas overlap with at least one of the imaging aperture identification areas. Reflectivity of the second touch area is smaller than reflectivity of the first touch area; or transmittance of the second touch area is greater than transmittance of the first touch area; or light transmission uniformity of the second touch area is greater than light transmission uniformity of the first touch area.