Rough Adhesion Layer for Flexible Display Substrate Infiltration
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Solution Overview
Problem
The existing methods for manufacturing flexible display devices often result in defects such as warp, bubble, and peeling off due to poor infiltration of liquid polyimide on the glass carrier substrate, leading to a reduced qualified rate of the flexible display devices.
Innovation Solution
A method involving the formation of an adhesion layer with a rough surface at the juncture of the releasing layer and the carrier substrate, using metal oxides like indium tin oxide or indium zinc oxide, which enhances adhesion between the carrier and flexible substrates, thereby preventing holiday defects during the fabrication of the flexible display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If liquid polyimide is applied on the glass carrier substrate, then the flexible substrate can be formed, but poor infiltration occurs leading to holiday defects
Solution Approach 1:
An adhesion layer is introduced as an intermediary between the glass carrier substrate and the liquid polyimide. This adhesion layer has a rough surface that enhances infiltration of the liquid polyimide, preventing holiday defects and improving both manufacturing precision and reliability.
2Ease of operation
If a releasing layer is formed on the carrier substrate, then the flexible substrate can be released after fabrication, but adhesion defects occur at the juncture of the releasing layer and carrier substrate
Solution Approach 1:
The solution applies different surface qualities to different regions: the releasing layer has a smooth surface for easy release, while the adhesion layer at the juncture has a rough surface for strong adhesion. This local differentiation resolves the contradiction between release capability and adhesion quality.
3Device complexity
If the flexible substrate is formed without adhesion enhancement, then the process is simple, but defects like warp, bubble and peeling off occur
Solution Approach 1:
The adhesion layer is formed in advance before applying the liquid polyimide. This preliminary action prepares the surface with enhanced adhesion properties, preventing defects like warp, bubble, and peeling off during subsequent fabrication processes, thereby improving reliability without significantly increasing complexity.
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 improves the qualified rate of flexible display devices by ensuring better adhesion and preventing defects like warp and peeling off, resulting in higher quality products.
Implementation Method 1
an adhesion layer with a rough surface is formed at a juncture of a releasing layer and a carrier substrate... which enhances adhesion between the carrier and flexible substrates
Data Source
Figure 1~2a
Figure 2b~3b
Figure 4a~5a
AI summary
The present invention relates to the display technology field and provides a method for manufacturing a flexible display device, wherein an adhesion layer having a rough surface is formed at a juncture of a releasing layer and a carrier substrate before a flexible substrate is formed on the carrier substrate. The technical solution of the present invention can improve the qualified rate of the flexible display device.