In-Display Fingerprint Sensor Array Substrate Design
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Solution Overview
Problem
Conventional electronic devices face a limitation in increasing the screen-to-body ratio due to the space occupied by fingerprint identification modules in non-display areas.
Innovation Solution
Integrating photoelectric sensors into sub-pixels within the display area of the screen, allowing the fingerprint identification module to be placed within the display area without occupying non-display space, by using an array substrate with a display circuit layer and a recognition circuit layer on a common base material, where the photoelectric sensors' projections fall into sub-pixel areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fingerprint identification module is disposed in the non-display area, then the fingerprint identification function is achieved, but the screen-to-body ratio is reduced
Solution Approach 1:
The patent merges the fingerprint identification module with the display area by integrating photoelectric sensors into sub-pixel regions. The recognition circuit layer is combined with the display circuit layer on the same array substrate, allowing the fingerprint sensing function to be embedded within the display area rather than occupying separate non-display space.
Solution Approach 2:
The patent utilizes the vertical dimension by stacking the recognition circuit layer and display circuit layer on top of each other on the array substrate. This layered structure allows the photoelectric sensors to be positioned beneath the display pixels vertically, enabling fingerprint identification without consuming horizontal display area.
2Area of stationary object
If the photoelectric sensors are integrated into sub-pixels, then the display area is increased, but the manufacturing complexity increases
Solution Approach 1:
The array substrate serves multiple functions simultaneously: it acts as the base for both the display circuit layer and the recognition circuit layer. The same substrate and manufacturing processes are used for both display pixels and photoelectric sensors, reducing the need for separate structural components and simplifying overall device architecture.
Solution Approach 2:
The patent modifies the structural parameters of the array substrate by adding the recognition circuit layer with photoelectric sensors. This structural parameter change enables dual functionality while maintaining compatibility with existing display manufacturing processes, thereby managing complexity through controlled structural evolution.
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 approach increases the display area and decreases the non-display area, thereby enhancing the screen-to-body ratio of both the display screen and the electronic device, allowing for full-screen display capabilities without the need for additional structural designs.
Implementation Method 1
a recognition circuit layer including a plurality of photoelectric sensors, projections of the plurality of photoelectric sensors on the first base material falling into a corresponding area of the sub-pixel projection areas; the photoelectric sensor being configured to sense target lights carrying user fingerprint information
Data Source
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AI summary
An array substrate is provided. The array substrate includes a first base material, and a display circuit layer and a recognition circuit layer laminated on the first base material. The display circuit layer includes multiple gate lines, multiple data lines, and multiple thin-film transistors (TFT). Projections of the multiple gate lines on the first base material and projections of the multiple data lines on the first base material define multiple sub-pixel projection areas. Each of projections of the multiple TFTs on the first base material falls into a corresponding area of the multiple sub-pixel projection areas. The recognition circuit layer includes multiple photoelectric sensors. Projections of the multiple photoelectric sensors on the first base material fall into different areas of the sub-pixel projection areas. The photoelectric sensor is configured to sense target lights carrying user fingerprint information. A display screen and an electronic device are further provided.