OLED Display Substrate Laser Stripping via Layer Segmentation

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Solution Overview

Problem

Existing methods for preparing OLED display panels face challenges in efficiently stripping off the flexible organic layers and inorganic layers from the base substrate without causing damage or wrinkles, especially when using laser lift-off techniques.

Innovation Solution

The proposed solution involves a display substrate motherboard structure comprising a base substrate, a first flexible organic layer, a first inorganic layer, a second flexible organic layer, and a pixel driving circuit layer. The second flexible organic layer is positioned inside the orthogonal projection of the first inorganic layer on the base substrate, ensuring that only the first flexible organic layer fully absorbs laser energy for easy stripping, preventing damage to the second flexible organic layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If laser lift-off technique is used to strip off flexible organic layers and inorganic layers from the base substrate, then the stripping process can be performed, but damage or wrinkles occur to the layers

Engineering Contradiction:

Improvestripping processVSAvoidlayer quality

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent segments the flexible organic layers into two distinct layers (first flexible organic layer and second flexible organic layer) with different positioning relative to the inorganic layer. The first flexible organic layer is fully covered by the inorganic layer, while the second flexible organic layer extends beyond the inorganic layer's projection. This segmentation allows selective laser heating of only the first flexible organic layer, enabling easy stripping without damaging the second layer or creating wrinkles.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by creating different structural characteristics in different regions of the laminate structure. Specifically, the first flexible organic layer has a different spatial relationship with the inorganic layer compared to the second flexible organic layer. This local structural difference enables selective interaction with laser energy, where only the first layer absorbs the laser energy for stripping, while the second layer remains protected due to its different positioning.

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If the second flexible organic layer extends beyond the inorganic layer projection, then easier stripping is achieved, but the structure becomes more complex

Engineering Contradiction:

Improvestripping efficiencyVSAvoidlaminate structure

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent divides the flexible organic layers into two segments with distinct functions and positions. The first flexible organic layer is fully covered by the inorganic layer and serves as the laser-absorbing stripping layer. The second flexible organic layer extends beyond the inorganic layer's projection and serves as a protective or structural layer. This segmentation achieves easy stripping while maintaining manageable structural complexity through clear functional differentiation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs a nested structure where the first flexible organic layer is nested within the projection of the inorganic layer, while the second flexible organic layer is positioned such that its projection extends beyond the inorganic layer. This nested arrangement allows the laser energy to selectively target the first layer for stripping while the second layer remains externally exposed and protected, achieving efficient stripping without excessive structural complexity.

Inventive Principle:

Principle #7Nested doll (Nesting)

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 facilitates easier and more efficient stripping of the laminate structure from the base substrate, reducing the risk of wrinkles and improving the quality and yield of the display substrates.

Implementation Method 1

only the first flexible organic layer fully absorbs laser energy for easy stripping

Methodology Applied

Scientific EffectLaser energy absorption: Absorption (EM radiation)

Data Source

PatentUS12232370B2Display substrate motherboard and preparation method thereof, display substrate and preparation method thereof

Publication Date: 2025.02.18 CHENGDU BOE OPTOELECTRONICS TECH CO LTD

AI summary

An Organic Light-Emitting Diode display substrate and a preparation method thereof. The Organic Light-Emitting Diode display substrate includes: a first flexible organic layer; a first inorganic layer on the first flexible organic layer; a second flexible organic layer on the first inorganic layer; a pixel driving circuit layer on the second flexible organic layer; a light-emitting element layer on the pixel driving circuit layer, and a thickness of the first flexible organic layer is 5 μm-20 μm, a thickness of the first inorganic layer is 0.4 μm-0.5 μm, and a thickness of the second flexible organic layer is 5 μm-20 μm.