Touch Device FPR Shared Electrode Control Circuit
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Solution Overview
Problem
Current touch devices with fingerprint recognition (FPR) functions face challenges in efficiently integrating touch and FPR operations using shared transmitting and receiving electrodes, requiring complex signal control and limited pin count management.
Innovation Solution
A touch device design incorporating multiple sensing regions, switch sets, and shift register circuits to control transmitting and receiving electrodes for both touch and FPR operations, utilizing shared electrodes for full-screen FPR sensing and reducing pin count through optimized signal control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If shared transmitting and receiving electrodes are used for both touch and FPR operations, then device integration and pin count reduction are achieved, but signal control complexity increases
Solution Approach 1:
The sensing array is divided into multiple sensing regions, with each region having dedicated switch sets and shift register circuits. This segmentation allows independent control of different regions for touch or FPR operations, reducing signal control complexity while maintaining shared electrode usage across the full screen
Solution Approach 2:
The system dynamically configures the function of electrode pairs by controlling switch sets to route signals differently based on operation mode. The same physical electrodes can be dynamically assigned to touch sensing or FPR sensing by changing the switch states, achieving adaptability without permanent hardware duplication
2Productivity
If multiple switch sets and shift register circuits are used to control sensing regions, then operational speed and control precision are improved, but device complexity increases
Solution Approach 1:
The control circuitry is segmented into multiple independent shift register circuits, each responsible for controlling a specific sensing region. This allows parallel operation of different regions, improving overall operational speed while keeping each individual circuit module simple and manageable
Solution Approach 2:
Each switch set and shift register circuit combination is designed to be multi-functional, capable of handling both touch sensing and FPR sensing operations. This universality reduces the need for separate dedicated circuits for each function, thereby reducing overall device complexity while maintaining high operational speed through parallel processing
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 simultaneous and efficient touch and FPR operations on a single device, improving operational speed and reducing pin count, while maintaining effective capacitive sensing for touch position determination and fingerprint recognition.
Implementation Method 1
The sensing regions include transmitting electrodes and receiving electrodes... for a touch operation and a FPR operation
Data Source
AI summary
A touch device with the FPR function includes a plurality of sensing regions, a plurality of first switch sets, a plurality of first shift register circuits, a plurality of second switch sets, and a plurality of second shift register circuits. The first switch sets are coupled to transmitting electrodes and to transmit a first signal. The first shift register circuits are to control the first switch sets according to a plurality of first reset signals and a plurality of first control signals respectively. The second switch sets are coupled to receiving electrodes and to receive a second signal. The second shift register circuits are to control the second switch sets according to a second reset signal and a plurality of second control signals. The first signal and the second signal are for a touch operation and a FPR operation.