In-Cell Array Substrate for Fingerprint Recognition
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Solution Overview
Problem
Existing touch screens with integrated in-cell touch functions are bulky, heavy, and costly due to separate fabrication of touch films and display panels, and they primarily recognize touch motions by fingers or conductive stylus, lacking effective fingerprint recognition capabilities.
Innovation Solution
An array substrate with subpixel units, including pixel and common electrodes, data and gate lines, and thin-film transistors, where a processing unit sends switch-on signals in phases for fingerprint recognition and display charging, enabling high-resolution fingerprint recognition by integrating touch-motion sensors into the display screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate touch film is attached on the TFT-LCD panel to implement in-cell touch functions, then touch motion recognition is achieved, but the display panel becomes bulky and heavy
Solution Approach 1:
The patent merges the touch sensor electrodes directly into the display panel structure by forming them on the same substrate as the TFT-LCD, eliminating the need for a separate touch film layer. This integration reduces the overall thickness and weight of the display panel while maintaining touch motion recognition functionality.
Solution Approach 2:
The display panel is designed to serve dual functions: display output and touch sensing. By incorporating touch sensor electrodes within the display structure, the panel becomes a multi-functional component that performs both visual display and touch interaction without requiring additional separate layers.
2Adaptability or versatility
If a separate touch film is fabricated and attached on the TFT-LCD panel, then touch functions are implemented, but fabrication cost increases
Solution Approach 1:
The patent combines the fabrication processes for touch sensor electrodes and display components into a single integrated manufacturing flow. By forming both on the same substrate using compatible materials and processes, the patent eliminates the need for separate touch film fabrication and bonding operations, thereby reducing overall manufacturing cost.
Solution Approach 2:
The display panel structure is designed to fulfill both display and touch sensing functions through a unified fabrication process. This multi-functional approach allows standard display manufacturing equipment and processes to produce both components simultaneously, avoiding the need for specialized touch film production lines and reducing overall fabrication cost.
3Ease of operation
If existing touch technologies are used, then touch motion recognition is achieved, but fingerprint recognition capability is lacking
Solution Approach 1:
The patent designs the touch sensor electrode structure to perform multiple sensing functions simultaneously. By configuring the electrode pattern and signal processing capabilities, the same sensor array detects both touch motions and fingerprint patterns, enabling the system to provide both touch interaction and biometric authentication without requiring separate sensing systems.
Data Source
AI summary
The present disclosure provides a method for driving an array substrate for fingerprint recognition. The method includes sequentially sending a switch-on signal by a processing unit to each gate line row by row along the column direction, the switch-on signal being divided into a first phase and a second phase. In the first phase of each switch-on signal, sending a touch-driving signal to pixel electrodes corresponding to the gate line through a first data line in each data line group, receiving a touch-sensing signal through a second data line in each data line group, and constructing a fingerprint pattern based on touch-sensing signals. In the second phase of each switch-on signal, simultaneously sending display signals to the first data line and the second data line in the data line groups to charge subpixel units corresponding to the gate line for displaying an image.