Flexible Display Substrate Barrier Structure for Laser-Lift-Off Separation

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Solution Overview

Problem

In the manufacturing of flexible display substrates, the second organic thin film often extends beyond the first organic thin film, making it difficult to separate the thin films from the base substrate using the Laser-Lift-Off technique, which complicates the process and reduces yield.

Innovation Solution

A barrier structure is formed on the inorganic thin film at its inner periphery, defining a region where the second organic thin film is formed, ensuring its projection onto the first organic thin film remains within the periphery, allowing for precise separation using the LLO technique.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the second organic thin film is formed as a liquid material on the base substrate, then the flexibility and coverage of the display substrate are improved, but the second organic thin film extends beyond the periphery of the first organic thin film, making separation difficult

Engineering Contradiction:

Improveflexibility and coverageVSAvoidseparation difficulty

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent introduces a barrier structure that segments the second organic thin film into distinct regions: a first region within the periphery of the first organic thin film and a second region outside it. This segmentation allows the inorganic thin film to act as a separation interface for the first region while the barrier structure manages the second region, resolving the separation difficulty

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The barrier structure serves as an intermediary element between the second organic thin film and the base substrate. It provides a controlled interface that facilitates separation of the second organic thin film from the base substrate, while the inorganic thin film simultaneously serves as a separation interface for the first organic thin film

Inventive Principle:

Principle #24Intermediary (Mediator)

2Area of stationary object

If the second organic thin film extends beyond the periphery of the first organic thin film, then the coverage area is increased, but the separation process becomes complex and yield decreases

Engineering Contradiction:

Improvecoverage areaVSAvoidseparation efficiency and yield

Core Design Contradiction:

Area of stationary objectVSProductivity

Solution Approach 1:

The barrier structure divides the second organic thin film into functional segments: a first region that can be separated with the first organic thin film via the inorganic thin film interface, and a second region managed by the barrier structure. This segmentation maintains full coverage area while enabling efficient separation processes

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The barrier structure is designed to enable self-service separation where the second organic thin film in the second region can be separated from the base substrate through the barrier structure interface, reducing the need for complex external separation processes and improving overall productivity

Inventive Principle:

Principle #25Self-service

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 approach simplifies the separation process, ensuring the second organic thin film is automatically separated along with the first, improving product yield and process stability by controlling the region of the second organic thin film formation.

Implementation Method 1

separating the first organic thin film, the inorganic thin film, the second organic thin film and the display component from the base substrate through a Laser-Lift-Off (LLO) technique

Methodology Applied

Scientific EffectLaser heating: Laser

Data Source

PatentUS10636986B2Flexible substrate, manufacturing method of the same, flexible display substrate and manufacturing method of the same

Publication Date: 2020.04.28 BOE TECHNOLOGY GROUP CO LTD

AI summary

A flexible substrate, a manufacturing method thereof, a flexible display substrate and a manufacturing method thereof are provided. The flexible substrate includes a first organic thin film, an inorganic thin film on the first organic thin film, a barrier structure on the inorganic thin film and at an inner side of a periphery of the inorganic thin film, and a second organic thin film in a region defined by the barrier structure, wherein an orthographic projection of the second organic thin film onto the first organic thin film is located at an inner side of the periphery of the first organic thin film.