Display Protective Film Patterning for Gentle Peeling
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Solution Overview
Problem
Existing display devices face challenges in efficiently removing protective films during manufacturing without damaging the components, which affects the reliability of flexible display devices.
Innovation Solution
A method involving the use of laser beams to form pattern portions in protective films, including protruding and concave structures, to facilitate easy removal while maintaining the integrity of the display device components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective film is used to prevent damage during manufacturing, then the reliability of the display device is improved, but the protective film becomes difficult to remove without damaging components
Solution Approach 1:
The protective film is divided into a body portion and a pattern portion with different adhesion characteristics. The pattern portion has reduced adhesion to the display panel through laser irradiation, allowing it to be easily removed while the body portion maintains strong protection during manufacturing.
Solution Approach 2:
Different regions of the protective film are given different properties: the body portion maintains high adhesion for protection, while the pattern portion (formed by laser irradiation) has low adhesion for easy removal. This local differentiation resolves the contradiction between protection and removability.
2Strength
If the protective film has strong adhesion to protect components, then component integrity is maintained, but the peeling force becomes too high for easy removal
Solution Approach 1:
The protective film is segmented into regions with different adhesion strengths. The body portion provides strong adhesion (high strength) for component protection, while the pattern portion has weak adhesion for easy peeling operations.
Solution Approach 2:
The adhesion strength is made non-uniform across the protective film. The pattern portion undergoes laser irradiation to create locally reduced adhesion strength, enabling easy peeling in specific areas while maintaining strong adhesion elsewhere for component protection.
3Ease of manufacture
If laser irradiation is applied to form pattern portions for easy removal, then the protective film becomes easier to remove, but additional manufacturing steps are required
Solution Approach 1:
The mechanical process of uniformly removing the protective film is replaced by laser irradiation that creates specific low-adhesion patterns. This substitution enables selective removal through optical energy rather than mechanical force, simplifying the overall removal process despite adding a laser step.
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 reliability of display devices by controlling the peeling force of protective films, ensuring they can be readily separated without damaging the display device components.
Implementation Method 1
irradiating a second laser beam toward the display panel from the upper side of the second protective film to form a pattern portion adjacent to an edge of the curved portion of the second protective film
Data Source
AI summary
A method of manufacturing a display device, includes providing a preliminary display device including a display panel, a panel protective film disposed under the display panel, and protective films disposed under the panel protective film and on the display panel, irradiating a first laser beam to the preliminary display device from an upper or lower side of the preliminary display device to form a curved portion at a corner of the preliminary display device, irradiating a second laser beam to the preliminary display device in which the curved portion is formed to form a pattern portion in at least one protective film of the protective films in a direction in which the first laser beam is irradiated, and removing the at least one protective film in which the pattern portion is formed.