Input Sensing Unit Noise Reduction via Layered Insulation

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Solution Overview

Problem

The complexity of electronic display devices with multiple layers of overlapping electrode patterns leads to undesirable noise that affects the accuracy of touch sensing units, causing errors in input detection.

Innovation Solution

An input sensing unit is designed with specific sensor and connecting patterns arranged in different directions, including insulation layers and mesh lines, to reduce noise interference by minimizing overlapping areas and using separate layers for connecting patterns, thereby isolating noise sources and enhancing touch sensitivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If multiple layers of overlapping electrode patterns are used in the touch panel, then the functionality and sensitivity of the touch sensing unit are improved, but noise is generated that affects the accuracy of touch detection

Engineering Contradiction:

Improvetouch sensing accuracyVSAvoidnoise interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The touch panel is divided into multiple independent sensing layers (first touch sensing unit, second touch sensing unit, third touch sensing unit) with each layer having its own electrode patterns. This segmentation allows each layer to function independently while reducing noise interference between layers through the use of insulation layers and strategically designed connecting patterns that minimize overlapping areas.

Inventive Principle:

Principle #1Segmentation

2Reliability

If connecting patterns are used to connect sensor patterns, then the electrical connectivity is improved, but overlapping areas between connecting patterns and sensor patterns generate noise

Engineering Contradiction:

Improveelectrical connectivityVSAvoidnoise from overlapping areas

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The connecting patterns are extracted and separated from the sensor patterns by placing them on different insulation layers. The first connecting patterns are on the first insulation layer while the second connecting patterns are on the second insulation layer, physically separating the connecting function from the sensing function to eliminate noise generated by overlapping areas.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent transitions from a two-dimensional planar arrangement where connecting patterns and sensor patterns overlap to a three-dimensional layered structure. By utilizing multiple insulation layers (first insulation layer, second insulation layer), the connecting patterns are positioned in different spatial dimensions, eliminating overlapping areas while maintaining electrical connectivity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Power

If larger overlapping areas are used between connecting patterns and sensor patterns, then the signal strength is improved, but noise interference increases

Engineering Contradiction:

Improvesignal strengthVSAvoidnoise interference

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

Different regions of the touch panel are designed with different qualities: the sensor patterns have large surface areas for strong signal generation, while the connecting patterns are positioned in separate insulation layers with minimized overlapping areas to reduce noise. This local differentiation optimizes both signal strength and noise reduction in their respective functional zones.

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

The solution effectively reduces noise interference, stabilizes the signal-to-noise ratio, and improves touch sensitivity by isolating noise generated by the display unit, providing a more accurate and reliable input sensing environment.

Implementation Method 1

an insulation layer disposed between the first connecting pattern and the second connecting pattern

Methodology Applied

Scientific EffectElectrical insulation: Dielectric

Implementation Method 2

the third connecting patterns having at least one portion having a first surface area crossing one of the first sensor patterns, wherein the at least one portion may include a second surface area overlapping the first sensor pattern

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS10852886B2Input sensing unit and electronic device including the same

Publication Date: 2020.12.01 SAMSUNG DISPLAY CO LTD

AI summary

An input sensing unit includes may include first sensor patterns arranged in a first direction; first connecting patterns connecting the first sensor patterns; second sensor patterns arranged in a second direction; second connecting patterns connecting the second sensor patterns and being insulated from the first connecting patterns; third sensor patterns; and third connecting patterns connecting the third sensor patterns and being insulated from the first and second connecting patterns, the third connecting patterns having at least one portion having a first surface area crossing one of the first sensor patterns, wherein the at least one portion includes a second surface area overlapping the first sensor pattern, and wherein the second surface area is smaller than the first surface area.