Touch Sensor Sub-Line Layout for Precise Multi-Line Position Sensing

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Solution Overview

Problem

Existing touch sensing technologies face challenges in accurately detecting touch inputs, particularly when multiple touch driving lines are connected to a single driving channel, leading to inaccuracies in sensing touch positions as dots or lines.

Innovation Solution

The implementation of touch sensing lines with distinct first and second sub-sensing lines on opposite sides, differing in structure and capacitance formation, allows for precise detection of touch events by varying capacitance changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If multiple touch driving lines are connected to a single driving channel, then device complexity is reduced, but touch sensing precision deteriorates

Engineering Contradiction:

Improvedriving channel configurationVSAvoidtouch position sensing accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

Each touch sensing line is segmented into first and second sub-sensing lines disposed on opposite sides, allowing differential capacitance measurement that can distinguish touch position even when multiple driving lines share a channel

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The first and second sub-sensing lines have different structures and form different capacitances with touch driving lines, creating local quality differences that enable precise touch position detection through capacitance comparison

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If symmetric sensing line structures are used, then manufacturing simplicity is improved, but touch sensing accuracy deteriorates

Engineering Contradiction:

Improvesensing line structureVSAvoidcapacitance detection accuracy

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The first sub-sensing line and second sub-sensing line are designed with different structures, creating asymmetric capacitance formation that enables accurate differentiation of touch position and prevents sensing errors

Inventive Principle:

Principle #4Asymmetry

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 the accuracy of touch sensing by ensuring differential capacitance changes are detected, enabling accurate recognition of touch inputs as dots or lines, even when multiple touch driving lines share a channel.

Implementation Method 1

a size of a capacitance formed by the first sub-sensing line and each of the touch driving lines disposed on the first side may be different from a size of a capacitance formed by the second sub-sensing line and each of the touch driving lines disposed on the second side

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS12561023B2Touch module, display device including the touch module, and electronic device including the display device

Publication Date: 2026.02.24 SAMSUNG DISPLAY CO LTD

AI summary

A touch module is provided which comprises a touch sensor including touch driving lines and touch sensing lines and a touch driver connected to the touch driving lines and the touch sensing lines to drive the touch sensor. Each of the touch sensing lines includes a first sub-sensing line disposed on a first side and a second sub-sensing line disposed on a second side opposite to the first side, and the first sub-sensing line is different from the second sub-sensing line.