Touch Screen Force Compensation via Temperature Sensing

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Solution Overview

Problem

Conventional touch screen apparatuses can only detect touch position and input information passively, lacking the ability to sense touch force and provide precise input based on varying temperatures, which limits their functionality.

Innovation Solution

A touch screen apparatus equipped with a temperature sensing unit and a touch driving circuit that compensates touch force level data according to temperature measurements, allowing for precise detection of touch force and position, enabling more accurate and varied input operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If touch force level data is measured without temperature compensation, then the touch screen can detect touch force, but the measurement precision deteriorates due to temperature-induced variations

Engineering Contradiction:

Improvetouch force measurement precisionVSAvoidtouch force detection reliability under temperature variations

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent applies parameter changes by measuring temperature and using it to compensate touch force level data. The touch driving circuit adjusts the touch force measurements based on temperature variations, changing the measurement parameters to account for thermal effects on sensor performance.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements feedback by using temperature sensor data to adjust touch force level data in real-time. The temperature measurement feeds back to the touch driving circuit, which then compensates the touch force readings to maintain accuracy across different temperature conditions.

Inventive Principle:

Principle #23Feedback

2Measurement precision

If the temperature sensor is continuously connected to the touch driving circuit, then temperature compensation can be performed, but energy consumption increases

Engineering Contradiction:

Improvetouch force measurement precisionVSAvoidenergy consumption of touch screen apparatus

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent applies periodic action by connecting the temperature sensor to the touch driving circuit only during touch detection events rather than continuously. The temperature sensor is activated when a touch is detected and disconnected otherwise, reducing energy consumption while maintaining measurement precision when needed.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent implements self-service by having the touch screen apparatus monitor its own temperature and automatically compensate touch force measurements without external intervention. The system manages its own temperature compensation needs by selectively activating the temperature sensor based on touch detection.

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If the touch screen only detects touch position, then the device complexity is low, but the functionality and information input capability are limited

Engineering Contradiction:

Improveinformation input capabilityVSAvoidtouch sensor structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies universality by making the touch screen perform multiple functions: detecting both touch position and touch force, and additionally performing temperature compensation. The touch sensor system is designed to handle multiple types of input data (position, force, temperature) to enhance information input capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges temperature sensing functionality with the touch detection system. The temperature sensor is integrated with the touch driving circuit, combining thermal measurement capabilities with existing touch sensing operations to enable comprehensive input without adding separate independent systems.

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

The solution enables precise sensing of touch force without temperature-induced variations, enhancing the touch screen's ability to input different types of information based on force magnitude, thereby improving user interaction with electronic devices.

Implementation Method 1

a temperature sensor measuring a temperature of the touch screen

Methodology Applied

Scientific EffectTemperature sensing:

Data Source

PatentUS10642420B2Touch screen apparatus that compensates touch force using measured temperature and electronic device comprising the same

Publication Date: 2020.05.05 LG DISPLAY CO LTD

AI summary

Disclosed herein is a touch screen apparatus. The touch screen apparatus includes a touch screen including a touch sensor, a temperature sensing unit to measure a temperature of the touch screen, and a touch driving circuit connected to the touch screen to generate touch position data and touch force level data and correct the touch force level data according to a temperature input from the temperature sensing unit.