Touch Sensor Shared Line Circuit for Ultrasonic Resolution
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Solution Overview
Problem
As the number of piezoelectric elements and sensor elements increases, the complexity of the circuit configuration grows, and high-density mounting becomes difficult, limiting the improvement of touch detection resolution.
Innovation Solution
A touch sensor design that includes a matrix arrangement of sensor elements capable of transmitting and receiving ultrasonic waves, with shared lines among the sensor elements to reduce the number of lines and simplify the circuit configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of piezoelectric elements and sensor elements is increased to improve touch detection resolution, then the resolution is improved, but the circuit configuration becomes complex and mounting density decreases
Solution Approach 1:
Multiple sensor elements share common transmission lines and reception lines, merging multiple individual connections into shared bus lines. This reduces the total number of lines required while maintaining the ability to individually address each sensor element through time-division or signal-division multiplexing schemes
Solution Approach 2:
The shared lines serve multiple functions by being sequentially or simultaneously connected to different sensor elements. Each line can function as a transmission line for one element while serving as a reception line for another, or both elements can use the same line for bidirectional communication
2Measurement precision
If the number of piezoelectric elements and sensor elements is increased to improve touch detection resolution, then the resolution is improved, but high-density mounting becomes difficult
Solution Approach 1:
By merging multiple individual connection lines into shared lines, the physical routing density on the substrate is reduced. Fewer lines mean less space consumption and simpler fabrication processes, enabling higher element density while maintaining manageable manufacturing complexity
3Reliability
If separate lines are connected to each sensor element to ensure reliable signal transmission, then signal transmission reliability is improved, but the number of lines increases and circuit complexity grows
Solution Approach 1:
The shared lines are used in a periodic or sequential manner to connect different sensor elements. The system switches connections over time, with each line being assigned to a specific sensor element during specific time periods, ensuring that each element receives reliable dedicated connection when needed while sharing the infrastructure overall
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
This design allows for improved touch detection resolution by reducing the complexity of the circuit and enabling high-density mounting of sensor elements, thereby enhancing the accuracy of touch detection.
Implementation Method 1
a plurality of sensor elements 50, and each sensor element 50 includes a vibration element 51 and a detection element 52, the vibration element 51 generates an ultrasonic wave
Implementation Method 2
a detection element 52 that detects the ultrasonic wave
Data Source
AI summary
A touch sensor includes: a plurality of sensor elements which are arranged in a matrix shape across a first direction and a second direction crossing the first direction and are capable of transmitting and receiving ultrasonic waves; and a plurality of lines connected to the plurality of sensor elements, wherein at least one of the plurality of lines is shared by the plurality of sensor elements.