Touch Sensing Circuit With Shared Terminal and Staggered Charging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing touch driving circuits for display devices require multiple terminals and a significant area on circuit boards, which increases manufacturing costs and complexity.
Innovation Solution
A touch driving circuit design that includes a first and second sensing driver with capacitors connected to touch electrodes, a touch sensing unit, and a deviation compensator, allowing for the sensing of user touch through a single terminal and reducing the number of receiving terminals and circuit area by matching output voltages from multiple touch electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple terminals are used to sense touch from multiple touch electrodes, then touch sensing capability is improved, but the number of receiving terminals and circuit area increase
Solution Approach 1:
The patent combines multiple touch electrode sensing functions into a single receiving terminal by using a shared sensing unit. The first and second touch electrodes are both connected to the same sensing unit through switching circuits, allowing the sensing unit to sequentially measure capacitance changes from both electrodes through one terminal, thereby reducing the number of terminals while maintaining full touch sensing capability
Solution Approach 2:
The sensing unit is designed with multi-functionality to handle multiple touch electrodes through a single terminal. By incorporating switching circuits that can connect different touch electrodes to the sensing unit in sequence, the sensing unit serves multiple purposes: sensing from first touch electrode, sensing from second touch electrode, and maintaining consistent measurement capability for both, all through one receiving terminal
2Measurement precision
If multiple terminals are used for touch sensing, then touch detection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple terminal connections into a single terminal configuration by using a shared sensing unit with switching control. This consolidation reduces the number of receiving terminals required on the circuit board, simplifying the manufacturing process and reducing assembly costs while preserving the ability to accurately detect touches from multiple electrodes through sequential measurement
3Measurement precision
If separate sensing circuits are used for each touch electrode, then touch sensing precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple separate sensing circuits into a single sensing unit by using switching circuits to selectively connect different touch electrodes to the shared sensing unit. This approach maintains the precision of individual electrode sensing through dedicated measurement cycles while reducing overall circuit complexity by eliminating redundant sensing unit components and simplifying the terminal structure
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 reduces manufacturing costs and provides a compact circuit layout while enhancing touch sensitivity by detecting small capacitance changes caused by user input.
Implementation Method 1
a first sensing capacitor connected to a first touch electrode; a second sensing capacitor connected to a second touch electrode
Data Source
AI summary
A touch driving circuit includes: a first sensing driver including a first sensing capacitor connected to a first touch electrode; a second sensing driver including a second sensing capacitor connected to a second touch electrode; and a touch sensing unit connected to the first and second sensing drivers to sense a voltage charged in each of the first and second sensing capacitors. A charging time point of the first sensing capacitor is different from a charging time point of the second sensing capacitor, and a discharging time point of the first sensing capacitor is different from a discharging time point of the second sensing capacitor.