Release Film Adhesion for Window Display Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing release films for windows in display devices often suffer from misalignment and reduced yield due to low adhesive strength and step differences between decoration and base substrates, particularly when the width of the light shielding area decreases.
Innovation Solution
A method of manufacturing a release film involving a window print layer and a hole adhesive film, both containing polyvinyl chloride and phthalate, applied through a silk screen process, which covers the decoration and base substrates, ensuring high adhesive strength and compensating for step differences, thereby improving alignment and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the width of the light shielding area is decreased, then the display device can be more compact, but the adhesive strength of the release film decreases and misalignment occurs
Solution Approach 1:
The release film is divided into multiple functional layers: a base layer for general protection, a window print layer with adhesive material for bonding to the light shielding area, and a hole adhesive film for securing the hole area. This segmentation allows each layer to perform its specific function, with the window print layer providing enhanced adhesion even when the light shielding area width is reduced.
Solution Approach 2:
Adhesive material is applied locally at critical areas where bonding is needed, rather than uniformly across the entire release film. The window print layer is formed to overlap with the light transmitting area and light shielding area, concentrating adhesive properties where they are most needed to prevent misalignment during assembly.
2Ease of manufacture
If a simple release film structure is used, then manufacturing is easier and cost is lower, but adhesive strength is insufficient and yield decreases
Solution Approach 1:
The release film uses a composite structure combining different materials: a base substrate material and a window print layer containing polyvinyl chloride (55-65 wt%) and phthalate (35-65 wt%). This composite approach enhances adhesive strength through the specific properties of PVC and phthalate while maintaining compatibility with existing manufacturing processes like silk screen printing.
Solution Approach 2:
The window print layer and hole adhesive film are formed in advance on the release film before the actual window assembly. This preliminary application of adhesive materials ensures that when the release film is applied to the window, proper adhesion occurs immediately, preventing misalignment and improving yield.
3Device complexity
If the release film is applied without compensating for step differences, then the process is simpler, but misalignment occurs due to step differences between decoration and base substrates
Solution Approach 1:
The window print layer is designed with sufficient area to overlap with both the light transmitting area and light shielding area, creating a cushioning effect that compensates for step differences between the decoration layer and base substrate. This overlapping design ensures that the adhesive material bridges the step difference, maintaining alignment precision without requiring complex adjustment processes.
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
The method enhances the adhesive strength of the release film, reducing misalignment and improving the yield of the window assembly process by increasing the contact area between the print layers and the window substrates.
Implementation Method 1
forming a window print layer on the window to entirely overlap with the light transmitting area and the light shielding area... The window print layer includes a polyvinyl chloride... a weight percent of the polyvinyl chloride relative to a total weight of the window print layer is equal to or more than about 55 wt % and equal to or less than about 65 wt %... the window print layer further includes a phthalate... a weight percent of the phthalate relative to a total weight of the window print layer is equal to or more than about 35 wt % and equal to or less than about 65 wt %
Data Source
AI summary
In a method of manufacturing a release film for a window, the method includes: providing the window comprising a light transmitting area and a light shielding area; forming a window print layer on the window to entirely overlap the light transmitting area and the light shielding area; and curing the window print layer, wherein the window print layer comprises a polyvinyl chloride.