Multi-User Touch Detection Circuit for Priority-Based Input Selection
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Solution Overview
Problem
Existing display devices with touch detection modules experience confusion and operation errors when multiple users provide simultaneous touch inputs, leading to inaccurate detection and coordination of touch positions.
Innovation Solution
A touch detection circuit with a touch sensing unit, unique signal generators, motion detection circuits, and a touch driving circuit that distinguishes users based on unique electrical signals and motion detection, prioritizing one user's touch input for accurate position coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a touch detection module detects touch inputs from multiple users simultaneously, then the quantity of detected touch inputs increases, but confusion and operation errors occur leading to inaccurate touch position detection
Solution Approach 1:
The touch detection system segments the touch input detection by associating each touch input with a specific user through unique identification. The touch driving circuit divides the detection process into user identification (through unique signals or motion detection) and touch position detection, allowing multiple users' inputs to be processed separately and accurately without confusion.
2Adaptability or versatility
If the touch detection module processes inputs from multiple users, then the versatility of the display device increases, but operation errors and confusion increase
Solution Approach 1:
The system implements feedback mechanisms where the touch driving circuit continuously monitors touch detection signals, identifies the user who performed the touch operation based on unique signals or motion detection patterns, and uses this feedback information to accurately attribute touch positions to the correct user, thereby maintaining high reliability in multi-user operations.
3Measurement precision
If unique signal generators are installed for each user to transmit unique signals, then user identification accuracy improves, but device complexity increases
Solution Approach 1:
Instead of requiring unique signal generators for each user, the patent applies local quality by using the existing touch sensing unit and touch electrodes to detect unique characteristics (such as capacitance patterns or motion detection data) specific to each user's touch. This approach achieves user identification accuracy without adding complex signal generation hardware for each user.
4Measurement precision
If motion detection circuits are added to detect touch direction and position, then touch detection capability improves, but device complexity increases
Solution Approach 1:
The touch sensing unit and touch electrodes serve multiple functions: they detect both the presence of touch inputs and the direction/position of touches, and they also capture unique characteristics for user identification. This multi-functionality allows the system to achieve enhanced touch detection capability without adding separate motion detection circuits, thereby avoiding increased device complexity.
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
The solution effectively identifies and prioritizes a single user's touch input among multiple users, ensuring accurate touch position detection and reducing operation errors in display devices.
Implementation Method 1
a touch sensing unit, in which touch electrodes are arranged, and a touch driving circuit, which detects a change in capacitance between the touch electrodes
Data Source
AI summary
A touch detection circuit includes: a touch sensing unit including a plurality of driving electrodes and a plurality of sensing electrodes arranged to intersect the driving electrodes; first through n-th unique signal generators transmitting first through n-th unique signals, which have different voltage or current characteristics, to bodies of first through n-th users, respectively; at least one motion detection circuit detecting a touch direction and touch position of each of the first through n-th users; and a touch driving circuit driving the driving electrodes and the sensing electrodes to detect touch detection signals and generate touch position coordinate information, wherein the touch driving circuit selects any one user, of the first through n-th users, who performed a touch operation on the touch sensing unit according to a preset priority, and generates and outputs touch position coordinate information according to the touch position of the selected user.