Touch Panel Shielding Drive Electrode for Signal Integrity

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Solution Overview

Problem

Existing touch panel technologies face challenges in accurately detecting touch positions and pressing forces due to capacitive load interference from connection wiring lines, leading to reduced accuracy in sensing capabilities.

Innovation Solution

A touch panel design featuring a sense electrode and a drive electrode with a shielding property against electric field components, where the drive electrode covers part of the sense electrode, eliminating the need for connection wiring lines and enhancing signal integrity by maintaining consistent signal intensity regardless of the detection target's position.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If connection wiring lines are used to connect adjacent first electrodes, then electrical connection between electrodes is achieved, but capacitive load interference is introduced reducing touch position and pressing force detection accuracy

Engineering Contradiction:

Improveelectrical connection reliabilityVSAvoidtouch position detection accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent removes the connection wiring lines from the electrode structure. By eliminating these wiring lines that caused capacitive load interference, the invention directly addresses the measurement precision problem while maintaining electrical connection through the drive electrode's direct coverage over the sense electrode, avoiding the harmful capacitive coupling effect.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The drive electrode serves as an intermediary element that covers the sense electrode without requiring separate connection wiring lines. This intermediary configuration allows electrical connection to be maintained while avoiding the capacitive load interference that would be introduced by traditional wiring lines connecting adjacent electrodes.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If connection wiring lines are provided across the fourth electrode, then first electrodes can be connected, but the fourth electrode is affected by capacitive load reducing detection accuracy

Engineering Contradiction:

Improveelectrode connection implementationVSAvoidpressing force detection accuracy

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The invention extracts and removes the connection wiring lines that were causing capacitive load interference on the fourth electrode. By eliminating these wiring lines, the patent resolves the measurement precision problem while maintaining the ease of manufacture advantage through the simplified direct coverage configuration of the drive electrode over the sense electrode.

Inventive Principle:

Principle #2Taking out (Extraction)

3Measurement precision

If drive electrode covers sense electrode, then capacitive load interference is eliminated, but signal intensity may vary with detection target position

Engineering Contradiction:

Improvedetection accuracyVSAvoidsignal intensity consistency

Core Design Contradiction:

Measurement precisionVSStability of the object's composition

Solution Approach 1:

The patent applies local quality by making the drive electrode's coverage over the sense electrode non-uniform. The drive electrode covers at least a part of the sense electrode in a planar view, creating localized shielding that eliminates capacitive load interference in the critical detection region while maintaining signal intensity consistency through controlled coverage areas.

Inventive Principle:

Principle #3Local quality

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

This configuration enables high-accuracy detection of touch positions and pressing forces by minimizing capacitive load interference and maintaining consistent signal intensity, thereby improving the overall sensing performance.

Implementation Method 1

a drive electrode including a first drive electrode having a shielding property against electric field components

Methodology Applied

Scientific EffectElectric Field: Electric Field

Implementation Method 2

capacitance is formed between one electrode (the fourth electrode) of the two electrodes provided on the upper layer and the electrode (the second electrode) provided on the lower layer

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS11507241B2Touch panel, display device, and input device having shielding for touch sensing electrodes and/or pressure sensing electrodes

Publication Date: 2022.11.22 SHARP KK

AI summary

A touch panel including a sense electrode having a rectangular shape extending in a first direction and including a first sense electrode and a second sense electrode, and a drive electrode having a rectangular shape extending in a second direction intersecting with the first direction on the sense electrode and including a first drive electrode having a shielding property against electric field components. The first drive electrode is positioned covering at least a part of the first sense electrode in a planar view in which the sense electrode is viewed from the drive electrode.