Bending Protective Layer Conductive Particles Crack Repair

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Solution Overview

Problem

Conventional display devices experience decreased performance due to cracks that occur when bent, leading to structural failures and impaired visibility.

Innovation Solution

A display device with a bending protective layer containing conductive particles that can fill cracks in the conductive layer, minimizing tensile stress and maintaining signal transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the display device is bent to improve visibility and reduce non-display areas, then adaptability and visibility are improved, but cracks occur in the conductive layer causing structural failure and performance degradation

Engineering Contradiction:

Improvebending capabilityVSAvoidstructural integrity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies different properties to different parts of the device: the bending protective layer is specifically disposed in the bending area rather than uniformly across the entire device. This localized approach provides enhanced protection where needed while maintaining overall device flexibility and performance

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The bending protective layer is formed by combining conductive particles with a polymer matrix material. This composite structure provides both mechanical protection against cracking and electrical conductivity to maintain signal transmission during bending operations

Inventive Principle:

Principle #40Composite materials

2Reliability

If a bending protective layer is added to prevent cracks, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improvecrack preventionVSAvoidlayer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The bending protective layer serves multiple functions simultaneously: it provides mechanical protection against cracks, maintains electrical conductivity through conductive particles, and preserves flexibility for bending. This multi-functionality reduces the need for separate protective layers and simplifies the overall device structure

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent modifies the properties of the protective layer by incorporating conductive particles with specific conductivity ranges and size distributions. This parameter adjustment allows the layer to provide both mechanical protection and electrical functionality, eliminating the need for additional conductive layers

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

The conductive particles within the bending protective layer effectively fill cracks in the conductive layer, preventing performance degradation even when the device is bent, ensuring continuous signal transmission and maintaining display quality.

Implementation Method 1

the conductive particles may fill in the crack

Methodology Applied

Scientific EffectParticle migration and filling:

Data Source

PatentUS11539029B2Display device with bending protective layer

Publication Date: 2022.12.27 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a substrate including a display area and a bending area adjacent to the display area, a conductive layer disposed on the substrate in the bending area, where the conductive layer is configured to transmit driving signals from a driving circuit to a display unit, and a bending protective layer disposed on the conductive layer in the bending area. The bending protective layer includes conductive particles. In the case of a crack in the conductive layer, the conductive particles within the bending protective layer may freely move and fill into the conductive layer, preventing a decrease in display performance.