Touch-Sensitive Display Device With Segmented Sensing Electrodes

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Solution Overview

Problem

Capacitive touch sensing units face limitations in manufacturing and sensor node density when the size of conductive rods decreases, requiring a more efficient design to accommodate smaller diameters and unique patterns like fingerprints.

Innovation Solution

The touch-sensitive display device incorporates a touch sensing unit with varying patterns of sensing electrodes in different regions, including a high-density minute sensing region for small conductive rods and a lower-density region for larger rods, maintaining a total number of electrodes and increasing sensor nodes per unit area.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of moving object

If the diameter of the conductive rod is reduced to 2 mm or less, then the size of the unit sensor node can be decreased, but the number of necessary sensing electrodes increases, limiting manufacturing and driving circuit capabilities

Engineering Contradiction:

Improvesize of unit sensor nodeVSAvoidnumber of sensing electrodes

Core Design Contradiction:

Area of moving objectVSQuantity of substance

Solution Approach 1:

The touch sensing unit is divided into multiple sensing regions (first sensing region with high density, second sensing region with low density). Each region has different electrode patterns optimized for its specific function, allowing the system to handle small diameter conductive rods without requiring uniform high-density electrodes across the entire display area.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different sensing regions are assigned different electrode densities and patterns based on local requirements. The first sensing region uses high-density electrodes for precise recognition of small conductive rods, while the second sensing region uses low-density electrodes for larger conductive rods, optimizing both manufacturing feasibility and sensing performance.

Inventive Principle:

Principle #3Local quality

2Measurement precision

If the number of sensing electrodes is increased to recognize small conductive rods, then the recognition precision improves, but the device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improverecognition precision of conductive rodVSAvoidcomplexity of sensing electrode pattern

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The sensing unit is segmented into regions with different electrode densities. Only the first sensing region requires high-density electrodes for precise recognition of small conductive rods, while the second sensing region uses simpler low-density patterns, reducing overall device complexity compared to uniform high-density coverage.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

High measurement precision is achieved locally in the first sensing region where small conductive rods are detected, while the second sensing region uses lower precision patterns appropriate for larger conductive rods. This localized approach maintains necessary precision without requiring complex high-density patterns everywhere.

Inventive Principle:

Principle #3Local quality

3Measurement precision

If the electrode density is increased in the first sensing region, then the recognition of small conductive rods and fingerprints is enhanced, but the manufacturing precision requirements increase

Engineering Contradiction:

Improverecognition capability of small objectsVSAvoidprecision of electrode pattern fabrication

Core Design Contradiction:

Measurement precisionVSManufacturing precision

Solution Approach 1:

The touch sensing unit is divided into a first sensing region with high-density electrodes for small object recognition and a second sensing region with low-density electrodes for larger objects. This segmentation concentrates high manufacturing precision requirements to only the necessary first sensing region, making overall manufacturing more feasible.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

High electrode density and corresponding manufacturing precision are applied only in the first sensing region where small conductive rods and fingerprints need to be recognized. The second sensing region uses lower density patterns with relaxed manufacturing precision requirements, optimizing the balance between recognition capability and manufacturability.

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 design enhances the recognition of small conductive rods and unique patterns like fingerprints, optimizing the use of space and allowing the driving circuit to operate smoothly, while maintaining the overall number of sensor nodes.

Implementation Method 1

A capacitive touch sensing unit has been developed having high durability, short reaction time, and high transmissivity

Methodology Applied

Scientific EffectCapacitive coupling: Capacitance

Data Source

PatentUS9696848B2Touch-sensitive display device

Publication Date: 2017.07.04 SAMSUNG DISPLAY CO LTD

AI summary

A touch-sensitive display device is provided. The touch-sensitive display device includes a touch sensing unit and a display panel. A plurality of sensing electrodes is formed in the touch sensing unit. A plurality of driving electrodes to which driving voltages are applied is formed in the display panel. The plurality of sensing electrodes is formed in predetermined patterns on one side of the touch sensing unit, and the patterns of the plurality of sensing electrodes are different in a first sensing region and a second sensing region.