Integrated Touch Pressure Sensor Using Dual Transparent Substrates

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Solution Overview

Problem

Conventional touch display devices with integrated pressure sensing functionality increase manufacturing costs and device thickness due to the need for external pressure sensors.

Innovation Solution

A touch display device design that integrates a pressure sensor and a touch sensor by using a substrate with a liner layer, patterned transparent substrates, touch electrodes, and a metal bridge, allowing for simultaneous pressure and touch sensing without an external pressure sensing module, reducing thickness and manufacturing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If an external pressure sensor is attached to the touch display device, then pressure sensing function is achieved, but device thickness increases

Engineering Contradiction:

Improvepressure sensing functionVSAvoiddevice thickness

Core Design Contradiction:

Adaptability or versatilityVSLength of stationary object

Solution Approach 1:

The patent combines the pressure sensing function and touch sensing function into a single integrated sensor structure. The pressure sensor and touch sensor share the same substrate, electrode layers, and encapsulation structure, eliminating the need for separate external pressure sensor components and reducing overall device thickness.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The sensor structure is designed to perform multiple functions simultaneously - both pressure sensing and touch sensing - using a single integrated device. The same electrode configuration and substrate structure serve dual purposes, making the device multi-functional without requiring additional external components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If an external pressure sensor is attached to the touch display device, then pressure sensing function is achieved, but manufacturing cost increases

Engineering Contradiction:

Improvepressure sensing functionVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent merges the pressure sensor and touch sensor manufacturing processes into a single integrated fabrication sequence. Both sensor types are formed on the same substrate using shared material layers and processing steps, reducing material costs, assembly costs, and manufacturing complexity compared to producing separate sensors.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The integrated sensor design allows a single manufacturing line to produce both pressure and touch sensing capabilities simultaneously, reducing per-unit manufacturing costs through economies of scale and eliminating the need for separate production facilities or assembly processes for external pressure sensors.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If separate pressure sensor and touch sensor are used, then sensing functions are achieved, but device complexity increases

Engineering Contradiction:

Improvesensing functionsVSAvoidsensor structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines multiple sensor functions into a single integrated structure with shared components including substrate, electrode layers, dielectric layers, and encapsulation. This unified architecture reduces the number of discrete parts, simplifies assembly, and decreases overall device complexity compared to using separate pressure and touch sensors.

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

Enables simultaneous detection of pressure and touch actions while reducing the device's thickness and manufacturing costs, thereby enhancing the quality and functionality of the touch display device.

Implementation Method 1

A capacitance between the touch driving electrode and the touch sensing electrode is varied to perform touch sensing when the touch display device is applied

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

the first transparent substrate and the second transparent substrate move to each other to change a distance between the touch driving electrode and the touch sensing electrode when a certain pressure is applied to the touch display device, and the capacitance between the touch driving electrode and the touch sensing electrode is varied to perform pressure sensing

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS11194430B2Touch display device

Publication Date: 2021.12.07 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD

AI summary

A touch display device includes a cover plate, a touch display module, a substrate, a liner layer disposed on the substrate, a first transparent substrate disposed on the liner layer, a second transparent substrate disposed on the liner layer, a touch driving electrode and a touch sensing electrode. The touch driving electrode is disposed on the first transparent substrate, and the touch sensing electrode is disposed on the second transparent substrate. A capacitance between the touch driving electrode and the touch sensing electrode is varied to perform touch sensing when the touch display device is applied. A distance between the touch driving electrode and the touch sensing electrode is varied perform pressure sensing when a certain pressure is applied to the touch driving electrode.