Integrated Touch and Proximity Sensing Electrodes in LCD Panels

Solution Overview

Problem

Conventional display devices with built-in touch panels require additional components to detect proximity of a coil, leading to increased material and production costs.

Innovation Solution

A display with a built-in touch panel incorporating a circuit substrate, a counter substrate, and a liquid crystal layer, where touch sensing electrodes and proximity sensing electrodes are integrated on these substrates to detect electric capacitance and proximity of a coil without the need for additional components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If an induction layer constituted by wire lattice is provided behind the display screen to recognize proximity of a coil, then proximity detection capability is improved, but material cost and production cost increase

Engineering Contradiction:

Improveproximity detection capabilityVSAvoidmaterial cost and production cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent merges the proximity sensing function with the existing touch panel structure by integrating proximity sensing electrodes into the touch panel assembly. This combines multiple functions (touch sensing and proximity sensing) into a single integrated component, eliminating the need for a separate induction layer and reducing both material and production costs while maintaining proximity detection capability

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The touch panel is designed to perform multiple functions: it serves as both a touch sensing interface and a proximity sensing component. The proximity sensing electrodes are incorporated within the touch panel structure, allowing the same component to detect both touch inputs and coil proximity, thereby reducing overall system complexity and cost

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If an induction layer constituted by wire lattice is provided behind the display screen to recognize proximity of a coil, then proximity detection capability is improved, but device complexity increases

Engineering Contradiction:

Improveproximity detection capabilityVSAvoidstructural complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges the proximity sensing function with the existing touch panel structure by integrating proximity sensing electrodes into the touch panel assembly. This combines multiple functions (touch sensing and proximity sensing) into a single integrated component, eliminating the need for a separate induction layer and reducing both material and production costs while maintaining proximity detection capability

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The touch panel is designed to perform multiple functions: it serves as both a touch sensing interface and a proximity sensing component. The proximity sensing electrodes are incorporated within the touch panel structure, allowing the same component to detect both touch inputs and coil proximity, thereby reducing overall system complexity and cost

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 the recognition of proximity of a coil without increasing material or production costs, enhancing the functionality of the display with embedded touch and proximity sensing capabilities.

Implementation Method 1

the proximity sensing electrode being provided on at least one of the circuit substrate and the counter substrate so as to detect proximity of a coil

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

detect an electric capacitance between the touch panel and a subject of a touch or a change in the electric capacitance

Methodology Applied

Scientific EffectElectric capacitance: Capacitance

Data Source

PatentUS10802633B2Display with built-in touch panel

Publication Date: 2020.10.13 SHARP KK

AI summary

The present invention makes it possible to recognize proximity of a coil without an increase in material cost and production cost. A liquid crystal display panel includes a TFT substrate (6) and a CF substrate (7). A touch panel (2) includes (i) a plurality of touch sensing electrodes (3) which are provided on the TFT substrate (6) so as to detect an electric capacitance between the touch panel (2) and a subject of a touch or a change in the electric capacitance and (ii) a proximity sensing electrode (4) which is provided on the CF substrate (7) so as to detect proximity of a coil (10).