Optical Processing Film for Display Panel Fingerprint Sensor
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Solution Overview
Problem
Current fingerprint recognition devices integrated with display screens face reduced recognition precision due to high light reflectivity of metal materials in light shield layers and electrode layers, which causes unnecessary light reflection and interference.
Innovation Solution
A display panel design featuring a photosensitive sensor with a light shield layer and an optical processing film, where the optical processing film has lower reflectivity than the light shield layer, and strategically positioned openings to minimize light reflection, using materials like molybdenum oxide to reduce unwanted light incidence on the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal materials are used in light shield layer and electrode layer, then electrical conductivity and structural strength are improved, but light reflectivity increases causing interference with photosensitive sensor
Solution Approach 1:
An optical processing film is introduced as an intermediary layer between the light shield layer and the photosensitive sensor. This film has lower light reflectivity compared to the metal light shield layer, thereby mediating the harmful light reflection and preventing it from reaching the photosensitive sensor, while the metal layers maintain their electrical conductivity function
Solution Approach 2:
The patent applies different material properties to different regions: the light shield layer uses high-conductivity metal materials for electrical function, while the optical processing film uses low-reflectivity materials specifically in the region adjacent to the photosensitive sensor to eliminate light interference, achieving local optimization of material properties
2Ease of operation
If light shield layer with openings is designed, then light transmission to sensor is enabled, but light reflection from surrounding areas increases
Solution Approach 1:
The optical processing film serves as a mediator that absorbs or redirects reflected light before it can reach the photosensitive sensor through the openings in the light shield layer, enabling light transmission while suppressing harmful reflections
3Object-affected harmful factors
If optical processing film with low reflectivity is added, then light reflection interference is reduced, but device structure and manufacturing complexity increase
Solution Approach 1:
The patent changes the optical parameter (light reflectivity) of the film layer in the specific region adjacent to the photosensitive sensor, making it lower than that of the light shield layer. This parameter change effectively reduces light reflection interference without requiring fundamental structural redesign
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
Enhances fingerprint recognition precision and speed by reducing light reflection, improving the accuracy and safety of fingerprint recognition in display devices.
Implementation Method 1
a light reflectivity of the optical processing film is less than a light reflectivity of the light shield layer
Data Source
AI summary
A display panel, a manufacturing method thereof and a display device are provided. The display panel includes: a photosensitive sensor; a light shield layer disposed on a sensing side of the photosensitive sensor and including at least one first opening and at least one second opening, the first opening and the photosensitive sensor are overlapped with each other in a direction perpendicular to a surface of the display panel, so that light running through the first opening is irradiated to the photosensitive sensor; and an optical processing film disposed in a region of the light shield layer close to the second opening and on at least a portion of a surface of the light shield layer away from the photosensitive sensor, and a light reflectivity of the optical processing film is less than a light reflectivity of the light shield layer.