Fingerprint Sensor Array Integration in Touch Display Panels
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Solution Overview
Problem
Current fingerprint recognition areas on smartphones are limited and narrow, making them inconvenient for users.
Innovation Solution
Integration of fingerprint recognition units within a touch display device, where the array substrate includes a thin film transistor array, photodiodes, and a fingerprint switch driver, allowing for fingerprint recognition by detecting light intensity changes from finger ridges and valleys, and is integrated with a display panel and backlight module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fingerprint recognition units are integrated within the display area, then fingerprint recognition capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the fingerprint recognition function with the display panel by integrating fingerprint recognition units (photodiodes) directly into the display area. The array substrate contains both display pixel circuits and fingerprint recognition circuit circuits, allowing simultaneous operation of display and fingerprint recognition functions within the same physical space, thereby improving versatility without proportionally increasing complexity
Solution Approach 2:
The display panel is designed to serve multiple functions: it acts as both a visual display device and a fingerprint recognition sensor. The array substrate integrates both display pixel circuits and fingerprint recognition circuits, enabling the same physical structure to perform dual functions, thus improving adaptability while managing device complexity
2Measurement precision
If photodiodes are arranged in specific patterns within the display area, then fingerprint recognition precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
The fingerprint recognition area is divided into multiple discrete photodiodes arranged in specific patterns (e.g., alternating rows or columns). Each photodiode independently detects light intensity from finger ridges and valleys, and the collective data from segmented sensors enables precise fingerprint recognition through pattern matching algorithms
Solution Approach 2:
Different regions of the display panel have different functional qualities: some areas contain display pixel circuits while others contain fingerprint recognition photodiodes. The photodiodes are strategically positioned in specific patterns within the display area to optimize fingerprint detection while maintaining overall display functionality, balancing precision requirements with manufacturing capabilities
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
Enables expanded fingerprint recognition capabilities within the display area, enhancing convenience and usability by integrating fingerprint scanning functionality into the display device without compromising display functionality.
Implementation Method 1
detecting light intensity changes from finger ridges and valleys
Implementation Method 2
photodiodes, allowing for fingerprint recognition by detecting light intensity changes
Data Source
AI summary
A fingerprint-sensing array on a substrate includes the substrate, scan lines, data lines, readout lines, sub-pixels, and multiple fingerprint recognition units. Areas between adjacent scan lines and adjacent data lines define one sub-pixel with pixel electrode and a first transistor. Of the first transistor, drain electrode connects to the pixel electrode, source electrode connects to one data line and gate electrode connects to one scan line. Thus some of the sub-pixels contain fingerprint recognition units, these being a photodiode electrically connected to one readout line. The readout line passes signals generated by the photodiode to achieve fingerprint recognition function. A display panel using the array on the substrate and a display device using the display panel are also provided.