Multi-chip Touch System Boundary Electrode Interference Control

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Solution Overview

Problem

In multi-chip touch systems using a differential method, signal processing between touch ICs can cause interference issues, particularly when two ICs are connected to a boundary receiving electrode, leading to suboptimal signal processing and potential noise or damage.

Innovation Solution

A touch system design where the second touch IC releases connections with at least one receiving electrode and the boundary receiving electrode when the first touch IC receives the sensing signal from the boundary electrode, allowing for optimal signal processing by minimizing mutual interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If two touch ICs are connected to a boundary receiving electrode to enable differential sensing, then sensing capability is improved, but signal interference and mutual interference between ICs occur

Engineering Contradiction:

Improvesensing capabilityVSAvoidsignal interference

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

The patent applies preliminary action by controlling the second touch IC to release its connection with the boundary receiving electrode before the first touch IC connects to it. This timing control prevents simultaneous connection and signal interference, allowing the first IC to sense the boundary electrode without interference from the second IC.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamics by making the connection state of the boundary receiving electrode dynamic rather than static. The boundary electrode is connected to different ICs at different times through controlled switching, enabling the system to adapt the connection configuration based on sensing needs and avoid fixed interference patterns.

Inventive Principle:

Principle #15Dynamics

2Productivity

If multiple touch ICs process sensing signals simultaneously, then processing capacity is improved, but signal noise and potential damage increase

Engineering Contradiction:

Improveprocessing capacityVSAvoidsignal noise

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies periodic action by implementing sequential sensing cycles where different touch ICs take turns processing the boundary receiving electrode. The sensing operation is divided into periods where the first IC senses during its designated time window, while the second IC remains disconnected, creating a periodic pattern that eliminates continuous interference and noise.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent uses preliminary action by having the second touch IC release its connection in advance before the first IC begins sensing. This preliminary disconnection ensures that no interference signals are present when the first IC starts its sensing operation, preventing noise contamination from the outset.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9916055B2Multi-chip touch system and control method therefor

Publication Date: 2018.03.13 SILICON WORKS CO LTD

AI summary

The present disclosure provides a technology related to a multi-chip touch system. In the multi-chip system, in a case in which two touch ICs share one receiving electrode and an even number of receiving electrodes are connected to one touch IC, when another touch IC senses the shared receiving electrode, the one touch IC does not connect another receiving electrode, which that is disposed at the outermost portion, as well as the shared receiving electrode.