Flexible Display Pressure Sensor for Single-Handed Zoom Control

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Solution Overview

Problem

Contemporary electro-capacitive touch screen panels fail to detect inputs from gloved hands or nonconductive objects and require two-handed operation for zooming, which is inconvenient, and are not flexible due to the thickness of glass substrates, limiting their application in flexible display devices.

Innovation Solution

A pressure sensor unit is integrated into a flexible display device with first and second electrodes arranged in different directions on a substrate, allowing single-handed zooming through pressure intensity and pattern recognition, enabling detection of inputs from various objects and maintaining flexibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If electro-capacitive touch screen panel is used, then touch input can be detected through dermal contact, but it cannot detect inputs from gloved hands or nonconductive objects

Engineering Contradiction:

Improveinput detection capabilityVSAvoidinput detection reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent combines electro-capacitive sensing electrodes with pressure-sensitive sensing electrodes in a multi-layer structure. The electro-capacitive layer detects conductive touches (fingers), while the pressure-sensitive layer detects non-conductive touches (gloved hands, pens), merging both detection capabilities into one system to resolve the limitation of single-method detection.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The touch screen panel is designed with multiple sensing mechanisms that serve different functions: electro-capacitive sensing for conductive objects and pressure sensing for non-conductive objects. This multi-functional design allows the same panel to reliably detect various types of inputs regardless of their electrical conductivity properties.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If two fingers are used to zoom in/out on electro-capacitive touch screen, then zoom function can be achieved, but user must use both hands which is inconvenient

Engineering Contradiction:

Improvezoom operation convenienceVSAvoidoperation complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent introduces dynamic pressure intensity recognition where the system differentiates between light touches (for selection) and heavy presses (for zooming). This dynamic response allows single-handed zoom operation by detecting pressure intensity variations, eliminating the need for two-handed two-finger gestures and simplifying user interaction.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the detection parameter from only touch position (x, y coordinates) to include pressure intensity as an additional parameter. By monitoring pressure magnitude variations at the touch point, the system can distinguish between different user intentions (scroll vs. zoom) and enable single-handed zoom control through pressure modulation.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If glass substrate with uniform thickness is used for touch screen panel, then manufacturing process can be satisfied, but flexibility and thinness characteristics cannot be achieved

Engineering Contradiction:

Improvesubstrate manufacturingVSAvoidflexibility characteristic

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent replaces the traditional rigid glass substrate with flexible substrates for both the electro-capacitive and pressure-sensitive sensing layers. This enables the touch screen panel to be bent and conform to curved surfaces, achieving flexibility and thinness while maintaining manufacturing feasibility through flexible substrate fabrication processes.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent employs composite material structures combining flexible substrates with multiple sensing layers (electro-capacitive and pressure-sensitive). This composite design integrates the flexibility of flexible substrates with the functional capabilities of different sensing mechanisms, achieving both manufacturability and adaptability for flexible display devices.

Inventive Principle:

Principle #40Composite materials

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 single-handed image zooming and input detection for gloved hands or nonconductive objects while maintaining a thin, flexible form factor, enhancing user convenience and compatibility with flexible display technologies.

Implementation Method 1

determining whether intensity of a sensing signal generated by a changed in a distance between the first electrodes and the second electrodes corresponding to the touch region

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS9703464B2Method of controlling user input using pressure sensor unit for flexible display device

Publication Date: 2017.07.11 SAMSUNG DISPLAY CO LTD

AI summary

There is provided a method of controlling a user input using a pressure sensor unit for a flexible display device in which the pressure sensor unit for sensing a touch position through pressure transmitted when a touch is made is formed on one surface of a substrate, by which a user may zoom in/out a displayed image by only one hand using the intensity and pattern of input touch pressure.