In-Display Photo Sensor Array for 3D Fingerprint Sensing
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Solution Overview
Problem
Conventional display devices face spatial limitations and reduced detection sensitivity when incorporating external fingerprint sensors, making it challenging to effectively sense three-dimensional pattern information such as fingerprint ridges.
Innovation Solution
A display device with a substrate, display elements, a window, and a photo sensor array is designed, where the photo sensor array is disposed between the substrate and the window to sense epidermal ridge information using light reflected from a touch input, and the display elements illuminate a contact area with light to enhance detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an external fingerprint sensor is added to the display device, then fingerprint sensing function is provided, but spatial limitations and reduced detection sensitivity occur
Solution Approach 1:
The patent merges the fingerprint sensing function with the display panel by integrating photo sensor arrays and light emitting elements directly into the display structure. This eliminates the need for separate external sensors, resolves spatial limitations, and improves detection sensitivity through optimized integration of sensing components within the display panel architecture.
Solution Approach 2:
The display panel is designed to perform multiple functions: visual display through display elements and fingerprint sensing through integrated photo sensor arrays. The same display structure serves both purposes, eliminating the need for separate dedicated sensing components and improving overall system efficiency.
2Volume of moving object
If the display device size is decreased, then portability is improved, but spatial limitations hinder the addition of external fingerprint sensors
Solution Approach 1:
By combining the fingerprint sensing components with the display panel structure, the patent eliminates the need for separate external sensors. The photo sensor arrays and light emitting elements are integrated directly into the display, allowing the device to maintain compact size while preserving full functionality.
Solution Approach 2:
The patent utilizes the vertical dimension by positioning photo sensor arrays at different depths within the display panel structure, between the substrate and the window. This three-dimensional integration allows additional sensing functionality without increasing the device footprint, enabling compact design while maintaining versatility.
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
This configuration reduces spatial limitations and improves detection sensitivity by integrating the fingerprint sensing functionality within the display panel, allowing for effective sensing of three-dimensional pattern information without the need for external sensors.
Implementation Method 1
The photo sensor array is configured to sense epidermal ridge information of a user via light reflected from a touch input of the user
Implementation Method 2
One or more of the display elements is configured to illuminate a contact area of the touch input with the light
Data Source
AI summary
A display device includes a substrate, display elements, a window, and a photo sensor array. The substrate includes a display area and a non-display area. The display elements overlap the display area. The window is disposed on the substrate. The photo sensor array is disposed between the substrate and the window. The photo sensor array is configured to sense three-dimensional pattern information (e.g., epidermal ridge information) of a user via light reflected from a touch input of the user. One or more of the display elements is configured to illuminate a contact area of the touch input with the light.