Segmented Touch Sensing Module for Concurrent Electrode Detection
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Solution Overview
Problem
Existing touch detection modules in display devices face challenges in achieving high accuracy and reliability while minimizing the size of touch electrodes and maintaining or reducing the number of touch driver circuits.
Innovation Solution
The touch detection module is designed with a touch sensing unit divided into multiple areas, where touch driving and sensing signal lines branch to connect with electrodes, allowing concurrent signal supply and sensing across these areas, reducing electrode size and increasing electrode count without increasing driver circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of touch electrodes is increased to improve touch sensing accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The touch sensing area is divided into multiple divided areas (first divided area, second divided area, etc.), and the touch electrodes are correspondingly segmented into groups. Each group of touch electrodes in a divided area can be driven and sensed independently through branched signal lines, allowing the system to handle a large number of electrodes without proportionally increasing the number of driver circuits.
Solution Approach 2:
The touch driver circuit is designed to perform multiple functions: it can concurrently drive and sense multiple divided areas using the same circuit block. The signal lines are designed to branch and serve multiple electrode groups, making the driver circuit universal across different divided areas rather than requiring dedicated circuits for each electrode.
2Measurement precision
If the size of touch electrodes is reduced to increase the number of electrodes, then measurement precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
By segmenting the touch sensing area into divided areas and grouping electrodes within each area, the system can use smaller electrodes with standardized dimensions. The segmentation allows for systematic arrangement and connection of small electrodes through branched signal lines, making the manufacturing process more controllable and precise.
3Measurement precision
If the number of touch driver circuits is increased to handle more touch electrodes, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The touch driver circuit is designed as a universal multi-functional unit that can concurrently drive and sense multiple divided areas. The same driver circuit block serves multiple groups of touch electrodes through branched signal lines, eliminating the need for separate driver circuits for each electrode or electrode group.
Solution Approach 2:
Multiple touch electrode groups from different divided areas are merged into a single coordinated system controlled by one touch driver circuit. The signal lines from the driver circuit branch out to multiple electrode groups, combining their control and sensing functions within a single driver circuit unit rather than using separate circuits for each group.
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 enhances touch detection accuracy and reliability by reducing errors and fabrication costs, while maintaining the number of touch driver circuits.
Implementation Method 1
a touch driver circuit configured to: concurrently supply touch driving signals to the touch electrodes located in each of the divided areas through the touch driving signal lines; and detect touch sensing signals of the touch electrodes from each of the divided areas through the touch sensing signal lines. The touch driver circuit is configured to concurrently detect the touch sensing signals from the divided areas, and measure an amount of change in a capacitance of the touch electrodes.
Data Source
AI summary
A touch detection module includes: a touch sensing unit including: touch electrodes in a touch sensing area, the touch sensing area being divided into a plurality of divided areas; and touch driving signal lines and touch sensing signal lines in a touch peripheral area; and a touch driver circuit to: concurrently supply touch driving signals to the touch electrodes located in each of the divided areas through the touch driving signal lines; and detect touch sensing signals of the touch electrodes from each of the divided areas through the touch sensing signal lines. The touch driver circuit is to concurrently detect the touch sensing signals from the divided areas, and measure an amount of change in a capacitance of the touch electrodes.