Touch Display Electrode Routing With Variable-Width Switch Circuits

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Solution Overview

Problem

The increasing number of drive and detection electrodes in display devices with touch detection functions complicates the layout of lines and terminals, leading to larger semiconductor chips and a more complex structure.

Innovation Solution

A display device design that includes a display unit with electrodes, a touch sensor, and a switch circuit group, where transistors connected to these electrodes have varying channel widths, with a first transistor connected via a shorter line and a second transistor via a longer line, optimizing the layout and reducing complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the number of drive electrodes and detection electrodes is increased to improve image display performance and touch detection performance, then the performance of image display and touch detection is improved, but the layout of lines and terminals becomes complicated, the semiconductor chip size becomes larger, and the structure becomes more complex

Engineering Contradiction:

Improvetouch detection performanceVSAvoidlayout complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the electrode array into multiple groups, where each group is connected to a separate drive electrode through a switch circuit. This segmentation allows the touch sensor to control multiple display electrodes independently, reducing the total number of direct connections needed and simplifying the overall layout complexity while maintaining high touch detection performance

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The drive electrodes serve dual functions: they act as both display electrodes for image formation and as touch detection electrodes for touch sensing. This multi-functionality reduces the total number of electrodes needed, thereby simplifying the layout and reducing semiconductor chip area while maintaining both display and touch detection performance

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Productivity

Engineering Contradiction:

Improveimage display performanceVSAvoidsemiconductor chip size

Core Design Contradiction:

ProductivityVSArea of stationary object

Solution Approach 1:

The patent merges the drive electrode function and touch detection electrode function into a single electrode structure. Each electrode can be selectively activated for either display or touch detection purposes, reducing the total electrode count and thereby reducing the semiconductor chip area while maintaining high image display and touch detection performance

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent employs dynamic control through switch circuits that can selectively connect different electrodes to the drive signal based on operational mode. This dynamic switching allows the same physical electrode to serve different functions at different times, reducing the static number of electrodes needed and minimizing chip area while maintaining high productivity

Inventive Principle:

Principle #15Dynamics

3Reliability

Engineering Contradiction:

Improvetouch detection performanceVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the switching control function from the electrode structure itself and places it in separate switch circuits. This extraction allows the electrode array to remain simple while the switching logic handles the complexity of multi-function operation, thereby maintaining high touch detection performance while reducing overall structural complexity

Inventive Principle:

Principle #2Taking out (Extraction)

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 simplifies the layout and reduces the size of semiconductor chips while maintaining effective image display and touch detection performance.

Implementation Method 1

The capacitive type utilizes a feature that the electrostatic capacitance between a pair of electrodes (called a drive electrode and a detection electrode) is varied by approach or contact of the inputting object

Methodology Applied

Scientific EffectElectrostatic capacitance: Capacitance

Data Source

PatentUS20260063953A1Display device

Publication Date: 2026.03.05 MAGNOLIA WHITE CORP

AI summary

A display device is provided and includes display unit comprising common electrodes two dimensionally arrayed on substrate, drive signal lines configured to transmit drive signals for touch detection to common electrodes, and switch circuit comprising transistors connected to drive signal lines to select at least one common electrode; flexible substrate connected to substrate; pads at connections of flexible substrate and substrate; and touch detection circuit configured to transmit drive signals to common electrodes, wherein: transistors comprises: first transistor connected to first electrode of common electrodes via first wiring of first length; and second transistor connected to second electrode of common electrodes via second wiring of second length; channel width of first transistor is narrower than channel width of second transistor; drive signal lines are respectively connected to pads separated at two or more positions.