Buffer Film Adhesion Control for Display Rework
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Solution Overview
Problem
Existing display devices face challenges during rework processes, where the detachment of optical films can lead to damage to the light emitting element layer due to strong adhesion between the optical film and the encapsulation thin film layer, resulting in reduced yield and increased costs.
Innovation Solution
Incorporating a buffer film with controlled adhesion properties between the optical film and the encapsulation thin film layer, allowing for selective detachment of the optical film while minimizing damage to the light emitting element layer, by varying the adhesion strength between the buffer film and the optical film relative to the encapsulation thin film layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the optical film is strongly adhered to the encapsulation thin film layer, then the structural stability is improved, but the ease of repair deteriorates due to difficulty in detaching the optical film for rework
Solution Approach 1:
The patent introduces a buffer film as an intermediate layer between the optical film and the encapsulation thin film layer, segmenting the adhesion system into two separate adhesion interfaces. This allows the optical film to be detached for rework without directly compromising the structural integrity of the encapsulation layer, thus resolving the contradiction between structural stability and ease of repair.
Solution Approach 2:
The buffer film acts as an intermediary layer that mediates the adhesion between the optical film and the encapsulation thin film layer. By controlling the adhesion properties of this intermediate layer, the patent enables selective detachment of the optical film while maintaining the overall structural stability of the display device.
2Reliability
If the optical film is strongly adhered to the encapsulation thin film layer, then the reliability is improved, but the loss of substance worsens due to damage to the light emitting element layer during rework
Solution Approach 1:
By segmenting the adhesion system with a buffer film, the patent prevents direct strong adhesion between the optical film and the encapsulation layer. This segmentation protects the light emitting element layer from damage during optical film detachment, reducing material loss while maintaining reliability through the buffer film's controlled adhesion properties.
Solution Approach 2:
The buffer film serves as a protective intermediary that prevents direct contact and potential damage between the optical film and the encapsulation thin film layer during rework processes. This intermediary layer ensures that detachment forces do not transmit directly to the light emitting element layer, thereby preventing material loss.
3Ease of repair
If a buffer film is introduced between the optical film and encapsulation thin film layer, then the ease of repair is improved, but the device complexity worsens
Solution Approach 1:
The buffer film performs multiple functions simultaneously: it provides controlled adhesion for ease of repair, maintains structural stability, protects the light emitting element layer, and manages adhesion strength relationships. This multi-functionality justifies the added layer by delivering multiple benefits from a single component.
Solution Approach 2:
The patent optimizes the adhesion parameters of the buffer film to achieve the desired balance between ease of repair and device complexity. By carefully controlling the adhesion strength between the buffer film and adjacent layers, the patent minimizes the impact of the additional layer on overall device complexity while maximizing repairability.
Data Source
AI summary
A display device includes a substrate, a light emitting element layer that is on the substrate and that includes a light emitting element, an encapsulation thin film layer that is on the substrate and the light emitting element layer and that encapsulates the light emitting element layer, a buffer film on the encapsulation thin film layer and adhered to the encapsulation thin film layer, and an optical film on the buffer film and adhered to the buffer film.