Protective Film With Dummy Layer For Display Cover Window
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Solution Overview
Problem
The existing protective films for cover windows in display devices require significant time and cost for jig replacement during the peeling process and have a low peeling success rate, which hampers efficiency and productivity.
Innovation Solution
A protective film design featuring a release film, a base film with a protective part and a pull tab, and a dummy film that does not overlap the base film, with the adhesive layer only in areas where the release film overlaps the base and dummy films, allowing for easier peeling and minimizing adhesive transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional protective film design is used, then the cover window is protected during manufacturing, but significant time and cost are required for jig replacement during peeling
Solution Approach 1:
The protective film is divided into multiple functional layers: a release film layer, a base film layer with protective part, and a dummy film layer. Each layer serves a specific function, with the dummy film acting as a placeholder that eliminates the need for jig replacement during peeling operations.
Solution Approach 2:
The dummy film acts as an intermediary element between the release film and the base film. It provides a temporary structure that facilitates easy peeling of the release film without requiring jig replacement, thereby improving peeling success rate and reducing time loss.
2Reliability
If a conventional protective film design is used, then the cover window is protected during manufacturing, but cost is incurred for jig replacement
Solution Approach 1:
The protective film is divided into multiple functional layers: a release film layer, a base film layer with protective part, and a dummy film layer. Each layer serves a specific function, with the dummy film acting as a placeholder that eliminates the need for jig replacement during peeling operations.
Solution Approach 2:
The dummy film acts as an intermediary element between the release film and the base film. It provides a temporary structure that facilitates easy peeling of the release film without requiring jig replacement, thereby improving peeling success rate and reducing time loss.
3Strength
If the adhesive layer is applied broadly, then strong adhesion is achieved, but adhesive material transfers during peeling
Solution Approach 1:
The adhesive layer is applied selectively only in specific regions where the release film overlaps with the base film and dummy film, rather than uniformly across the entire surface. This localized application ensures sufficient adhesion strength at critical interfaces while preventing adhesive transfer during peeling operations.
Solution Approach 2:
Instead of applying adhesive uniformly across the entire release film surface, the adhesive is applied partially only in the overlapping regions. This partial action provides adequate adhesion where needed while avoiding excessive adhesive material that would transfer during peeling.
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 design reduces the time and cost associated with jig replacement and improves the peeling success rate by aligning the protective film correctly and minimizing adhesive material transfer during the peeling process.
Implementation Method 1
an adhesive layer which is disposed on the release film
Data Source
AI summary
A protective film is provided. The protective film includes a release film, a base film which is disposed on the release film and comprises a protective part and a first pull tab part protruding from a first side surface of the protective part, and a first dummy film which is disposed on the release film, does not overlap the base film in a plan view, and comprises a part partially surrounding the first pull tab part, where edges of the base film and edges of the first dummy film are disposed inside edges of the release film in the plan view.