Bendable Display Adhesive Layer Groove Patterns

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing display devices face challenges in accurately recognizing the contact position of an electronic pen due to sensing pattern recognition issues, leading to suboptimal input detection and display quality.

Innovation Solution

A display device design featuring a bendable area with non-bendable regions, a display substrate with transistors and light emitting elements, a sensing layer with complementary groove patterns, and an adhesive layer to enhance interlayer adhesive force, minimizing bubble generation and pattern visibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a sensing layer with sensing patterns is applied to recognize electronic pen input, then the electronic pen input recognition capability is improved, but the sensing patterns become visible and reduce display quality

Engineering Contradiction:

Improveelectronic pen input recognitionVSAvoidsensing pattern visibility

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

An adhesive layer is introduced as an intermediary between the sensing layer and the display substrate. This adhesive layer acts as a mediator that optically masks the sensing patterns, preventing them from being visible on the display while maintaining the sensing functionality. The adhesive layer with refractive index between 1.3 and 1.7 effectively blocks the visibility of underlying sensing patterns.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The adhesive layer is designed with specific optical properties (refractive index 1.3-1.7) that affect light transmission and refraction. By controlling the optical characteristics of the adhesive layer, the sensing patterns beneath are optically masked, changing how light interacts with the layered structure to hide the patterns from view while preserving sensing capability.

Inventive Principle:

Principle #32Color changes

2Device complexity

If the sensing layer is directly attached to the display substrate, then the device structure is simplified, but bubbles are generated between layers reducing display quality

Engineering Contradiction:

Improvelayer structureVSAvoidbubble generation

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The adhesive layer serves as an intermediary between the sensing layer and display substrate, providing a controlled interface for bonding. This intermediary layer allows for more uniform adhesion and reduces the likelihood of bubble formation that would occur with direct attachment, while the added layer is optically managed to not compromise display quality.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The refractive index of the adhesive layer is specifically controlled to be between 1.3 and 1.7, optimizing both the optical masking of sensing patterns and the adhesive bonding properties. This parameter optimization ensures effective pattern hiding while maintaining good interlayer adhesion and minimizing bubble formation.

Inventive Principle:

Principle #35Parameter changes

3Strength

If the adhesive layer has high adhesive force to the sensing layer, then the interlayer bonding is improved, but the sensing patterns become more visible

Engineering Contradiction:

Improveinterlayer adhesive forceVSAvoidpattern visibility

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The refractive index of the adhesive layer is optimized to be between 1.3 and 1.7, which creates an optical mismatch that masks the sensing patterns beneath. This optical masking effect reduces pattern visibility while the adhesive composition and thickness are adjusted to maintain strong adhesive bonding to the sensing layer, achieving both goals simultaneously.

Inventive Principle:

Principle #35Parameter changes

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

Improves the recognition of electronic pen inputs and enhances display quality by optimizing the adhesive force between the sensing layer and adhesive layer, reducing bubble formation and pattern visibility.

Implementation Method 1

the adhesive layer may include a first surface facing the sensing layer; and groove patterns recessed from the first surface of the adhesive layer... an interlayer adhesive force between the sensing layer and the adhesive layer may be improved as the adhesive layer coupled or connected or attached to the sensing layer may include the groove pattern

Methodology Applied

Scientific EffectMechanical interlocking: Mechanical Fastener

Data Source

PatentUS11422648B2Bendable display device with sensing electrode

Publication Date: 2022.08.23 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a bendable area and non-bendable areas adjacent to the bendable area; a display substrate including transistors and a light emitting element; a sensing layer disposed under the display substrate and including a digitizer; and an adhesive layer disposed between the display substrate and the sensing layer, wherein the adhesive layer includes a first surface facing the sensing layer; and groove patterns recessed from the first surface of the adhesive layer.