Haptic Touch Panel With Asymmetric Dielectric Layers

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional haptic presentation touch panels face difficulties in location detection due to increased noise propagation when haptic sensation intensity is enhanced, making it challenging to maintain sensitivity.

Innovation Solution

A haptic presentation touch panel design featuring a transparent insulating substrate with detection electrodes and haptic electrodes arranged in specific directions, covered by dielectric layers with differing relative permittivities, where the second dielectric layer covering the haptic electrodes has a greater relative permittivity than the first dielectric layer covering the detection electrodes, and a transmit electrode on the opposite side for touch location detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the capacitance is increased to intensify the haptic sensation presented by the haptic electrodes, then the haptic presentation intensity is improved, but the propagation of noise increases making location detection difficult

Engineering Contradiction:

Improvehaptic presentation intensityVSAvoidlocation detection sensitivity

Core Design Contradiction:

PowerVSMeasurement precision

Solution Approach 1:

The patent applies different dielectric materials with different relative permittivities to different regions: the first dielectric layer (lower permittivity) covers detection electrodes for precise location detection, while the second dielectric layer (higher permittivity) covers haptic electrodes for intense haptic presentation. This local differentiation allows each region to be optimized for its specific function without compromising the other.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the dielectric structure into two distinct layers: a first dielectric layer covering the detection electrodes and a second dielectric layer covering the haptic electrodes. This segmentation isolates the electrical characteristics of each electrode type, preventing noise from haptic electrodes from interfering with detection electrode signals while maintaining high haptic presentation intensity.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If the capacitance between haptic electrodes and user is increased to enhance haptic sensation, then the haptic presentation function is improved, but the noise propagation makes it difficult to secure detection sensitivity

Engineering Contradiction:

Improvehaptic presentation functionVSAvoidlocation detection sensitivity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent implements local quality by assigning different dielectric properties to different functional zones: the first dielectric layer with lower relative permittivity is positioned under detection electrodes to minimize noise and maximize detection sensitivity, while the second dielectric layer with higher relative permittivity is positioned under haptic electrodes to maximize haptic presentation effectiveness.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The dielectric layers serve as intermediaries between the electrodes and the user's finger. The first dielectric layer acts as an intermediary for detection electrodes that minimizes noise coupling, while the second dielectric layer acts as an intermediary for haptic electrodes that enhances capacitive coupling for stronger haptic feedback.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 design effectively suppresses noise propagation while enhancing haptic presentation intensity, thereby improving the haptic presentation function while securing location detection sensitivity.

Implementation Method 1

a second dielectric layer covering the haptic electrodes, and having a greater relative permittivity than the first dielectric layer

Methodology Applied

Scientific EffectDielectric permittivity: Dielectric Permittivity

Implementation Method 2

technology of presenting a haptic sensation using a capacitance formed between a user and haptic electrodes when the user touches the surface

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS11797094B2Haptic presentation touch panel and display apparatus

Publication Date: 2023.10.24 MITSUBISHI ELECTRIC CORP

AI summary

In a haptic presentation touch panel detecting a location of a touch of a finger, a pen, and the like, and presenting a haptic sensation, a haptic presentation function is improved while location detection sensitivity is secured. The haptic presentation touch panel includes detection electrodes, a first dielectric layer covering the detection electrodes, haptic electrodes arranged not to overlap the detection electrodes in plan view, and a second dielectric layer covering the haptic electrodes, and the second dielectric layer has a greater relative permittivity than the first dielectric layer. Propagation of noise can thereby be suppressed even when a haptic presentation intensity is increased, and the location detection sensitivity can be secured.