Integrated Fingerprint Touch Display with Segmented Sensing
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Solution Overview
Problem
Current fingerprint and palm print recognition methods, such as total reflection and capacitance detection, face limitations in accuracy and power efficiency, particularly in distinguishing fingerprint ridge lines and valley lines, and in integrating touch detection with display functionality.
Innovation Solution
An integrated fingerprint detection touch control display apparatus featuring a counter substrate and an array substrate with light sources and photosensors, where light is totally reflected and detected to identify fingerprints, and a time-division mode for touch and fingerprint detection, allowing independent control of sensing regions and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If total reflection method is used for fingerprint detection, then fingerprint recognition is achieved, but power consumption increases and detection accuracy is limited
Solution Approach 1:
The display panel is divided into multiple sensing regions, each independently controllable by separate driver circuits. This allows only necessary regions to be activated for fingerprint detection, reducing overall power consumption while maintaining detection accuracy in active areas.
Solution Approach 2:
The system uses time-division multiplexing to alternately perform fingerprint detection and touch detection during different time periods. Fingerprint detection occurs during display periods when light sources are already active, while touch detection occurs during non-display periods, eliminating the need for continuous operation and reducing power consumption.
2Area of stationary object
If multiple sensing regions are activated for fingerprint detection, then detection coverage is improved, but power consumption increases
Solution Approach 1:
The sensing area is segmented into multiple independently controllable regions with separate driver circuits. This enables selective activation of only those regions where fingerprint detection is actually needed, rather than activating the entire sensing area, thus reducing power consumption while maintaining sufficient detection coverage.
Solution Approach 2:
Different sensing regions can be activated with different characteristics based on local requirements. Regions with higher fingerprint detection needs can be activated with higher sensitivity, while other regions remain inactive or operate at lower power modes, optimizing the balance between coverage and power consumption.
3Adaptability or versatility
If integrated touch and fingerprint detection is implemented, then functionality is enhanced, but system complexity increases
Solution Approach 1:
The same photosensor array and basic detection circuitry are used for both fingerprint detection and touch detection functions. By implementing time-division multiplexing and using separate gate scanning lines for different detection modes, the system achieves multi-functionality without proportionally increasing hardware complexity.
Solution Approach 2:
The system alternates between fingerprint detection mode and touch detection mode in time-division multiplexed fashion. During display periods, fingerprint detection is performed using the same light sources and photosensors. During non-display periods, touch detection is performed. This periodic switching allows one system to handle multiple detection functions without requiring separate dedicated hardware for each function.
4Speed
If continuous detection mode is used, then response time is improved, but power consumption increases significantly
Solution Approach 1:
The system performs detection operations periodically during appropriate time windows rather than continuously. Fingerprint detection is performed during display periods when light is already being emitted, and touch detection is performed during non-display periods. This periodic operation maintains detection responsiveness while avoiding the excessive power consumption of continuous monitoring.
Solution Approach 2:
The system utilizes otherwise wasted time periods for detection operations. During display periods when light sources are already active for image display, fingerprint detection is performed simultaneously. During non-display periods when the display is off, touch detection is performed. This approach converts idle time into useful detection time, maintaining continuous detection capability without requiring continuous power consumption.
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 detection accuracy and reduces power consumption by up to 90% by independently controlling sensing regions and using a time-division mode for touch and fingerprint detection, while maintaining display functionality.
Implementation Method 1
at least a portion of the light being totally reflected by a surface of the counter substrate facing away the array substrate
Implementation Method 2
a plurality of photosensors configured to detect the at least the portion of the light being totally reflected by the surface of the counter substrate facing away array substrate, thereby detecting a fingerprint information
Data Source
AI summary
The present application provides an integrated fingerprint detection touch control display apparatus. The integrated fingerprint detection touch control display apparatus includes a plurality of fingerprint sensing driver circuits respectively configured to independently control fingerprint detection respectively in a plurality of sensing regions in the integrated fingerprint detection touch control display apparatus; a touch sensing driver circuit configured to control touch detection in the integrated fingerprint detection touch control display apparatus; a counter substrate; and an array substrate facing the counter substrate. The array substrate includes a plurality of light sources; a plurality of photosensors; a plurality of photosensor driving thin film transistors respectively connected to the plurality of photosensors; a plurality of first gate lines respectively connected to the plurality of fingerprint sensing driver circuits; and a plurality of second gate lines connected to the touch sensing driver circuit for detecting a touch.