Touch Sensor Integrated Display Device Electrode Merging

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Solution Overview

Problem

Conventional touch sensor integrated type display devices face issues with complex design, degradation of display characteristics, and increased thickness due to the presence of contact holes and multiple electrode layers, which affect aperture ratios and touch performance.

Innovation Solution

The design eliminates contact holes by forming touch driving and sensing electrodes in a simple and efficient manner, with alternating electrode areas connected via wires, reducing parasitic capacitance and electrostatic capacitance, and integrating electrodes with common electrodes to improve aperture ratios and touch performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If touch driving electrodes and touch sensing electrodes are formed on the same layer with separate wires and contact holes, then touch sensor functionality is achieved, but device complexity increases and display characteristics degrade

Engineering Contradiction:

Improvetouch sensor functionalityVSAvoidstructure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges the touch driving electrode and touch sensing electrode into a single common electrode layer, eliminating the need for separate electrode layers, contact holes, and connecting wires. This consolidation maintains both touch driving and sensing functionalities while significantly simplifying the overall structure and reducing manufacturing complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The common electrode serves multiple functions simultaneously: it acts as both the touch driving electrode and the touch sensing electrode, and also functions as the common electrode for the display device. This multi-functionality eliminates the need for separate dedicated touch sensor electrode layers, reducing structural complexity while maintaining full touch sensor operation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If contact holes and multiple electrode layers are used to form touch sensor, then touch sensor functionality is achieved, but aperture ratios decrease and display characteristics degrade

Engineering Contradiction:

Improvetouch sensor functionalityVSAvoidaperture ratio

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

By merging the touch sensor electrodes with the display common electrode into a single integrated layer, the patent eliminates the need for additional contact holes and separate electrode layers that would reduce the aperture area. This integration maintains full touch functionality while maximizing the light transmission aperture ratio.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If separate wires and contact holes are used to connect touch electrodes, then electrical connection is achieved, but parasitic capacitance increases and touch performance degrades

Engineering Contradiction:

Improveelectrical connectionVSAvoidparasitic capacitance

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent eliminates separate connecting wires and contact holes by merging the touch electrodes directly into the common electrode layer. This integration removes the parasitic capacitance introduced by additional wire connections and contact hole structures, thereby improving touch sensing performance while maintaining reliable electrical connectivity.

Inventive Principle:

Principle #5Merging (Combining)

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 configuration enhances design simplicity, improves touch performance by reducing capacitance, and increases stability by eliminating external static electricity, benefiting high-resolution and large-area display devices.

Implementation Method 1

measures the amount of change in electrostatic capacitance caused by a touch and recognizes the presence or absence of a touch and a touch position

Methodology Applied

Scientific EffectElectrostatic capacitance: Capacitance

Data Source

PatentUS10101832B2Touch sensor integrated type display device

Publication Date: 2018.10.16 LG DISPLAY CO LTD

AI summary

A touch sensor integrated type display device includes a plurality of first areas where a plurality of first electrodes are respectively located; and a plurality of second areas where a plurality of second electrodes and a plurality of third electrodes are arranged alternately in a first direction so as to avoid contact with each other. The plurality of first electrodes located in the plurality of first areas are connected to each other in the first direction, the plurality of second electrodes located in the plurality of second areas are connected to each other in the first direction, and the plurality of third electrodes located in the plurality of second areas are arranged in a second direction crossing the first direction.