Touch Screen Device With Integrated Pen Signal Detection

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Solution Overview

Problem

Existing touch screen devices require separate sensors for precise touch detection with a touch pen, complicating manufacturing and increasing costs when integrated with display panels.

Innovation Solution

A touch screen device that uses a touch pen with a conductive tip to receive and transmit synchronized touch electrode driving signals, eliminating the need for separate sensors on the touch panel by integrating touch detection into the display panel's driving circuit.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If separate sensors are provided in the touch panel to detect touch pen input, then touch detection accuracy is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improvetouch detection accuracyVSAvoidtouch panel structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The touch electrodes that originally serve display functions are made to perform dual functions: displaying images and detecting touch pen inputs. The touch electrodes receive touch pen driving signals and detect touch positions without requiring separate sensor structures, achieving multi-functionality that resolves the contradiction between detection accuracy and device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention merges the touch detection function with the display function by integrating touch electrode driving signal reception directly into the existing display panel structure. The touch screen and display panel are combined into a single integrated structure where touch electrodes serve both purposes, eliminating the need for separate sensors and reducing overall device complexity

Inventive Principle:

Principle #5Merging (Combining)

2Measurement precision

If separate sensors are provided in the touch panel to detect touch pen input, then touch detection accuracy is improved, but manufacturing cost increases

Engineering Contradiction:

Improvetouch detection accuracyVSAvoidmanufacturing process

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

3Device complexity

If the touch screen uses existing touch electrodes without separate sensors, then device complexity is reduced, but touch detection sensitivity may decrease

Engineering Contradiction:

Improvetouch panel structureVSAvoidtouch detection sensitivity

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The invention changes the operational parameters of existing touch electrodes by applying specific touch electrode driving signals at predetermined frequencies. This allows the existing electrodes to detect touch pen inputs with high sensitivity through signal synchronization and frequency-based detection, maintaining reliability without adding complex sensor structures

Inventive Principle:

Principle #35Parameter changes

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

Enhances touch detection accuracy and sensitivity while simplifying the structure and reducing manufacturing complexity, allowing for high-sensitivity input and maintaining linearity of touch performance.

Implementation Method 1

a touch pen receiving the touch electrode driving signal applied to the plurality of touch electrodes and transmitting a pen output signal, synchronized with the received touch electrode driving signal, to the touch screen

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS9870075B2Touch screen device

Publication Date: 2018.01.16 LG DISPLAY CO LTD

AI summary

Disclosed is a touch screen device for accurately detecting a touch by using a touch pen without having a separate sensor provided in a touch panel. The touch screen device includes a touch screen including a plurality of touch electrodes, a touch driving circuit applying a touch electrode driving signal to the plurality of touch electrodes, and a touch pen receiving the touch electrode driving signal applied to the plurality of touch electrodes and transmitting a pen output signal, synchronized with the received touch electrode driving signal, to the touch screen.