Display Device Bending Area Adhesive Laser Processing
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Solution Overview
Problem
Existing display devices face challenges in manufacturing a bending area that is easily producible and efficient, particularly in reducing adhesive forces in specific areas to facilitate bending without damaging the display panel or passivation film.
Innovation Solution
A manufacturing method involving a CO2 laser to weaken the adhesive force of a portion of the adhesive layer at the bending area, followed by removing the passivation film and weakened adhesive layer, creating a groove and allowing the display module to be bent by disconnecting the passivation film and adhesive layer at the boundary of the bending area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the adhesive layer maintains strong adhesive force throughout the display module, then the structural integrity is improved, but the ease of bending at the bending area deteriorates
Solution Approach 1:
The adhesive layer is designed with spatially varying adhesive properties: the first adhesive portion at the bending area has reduced adhesive force to enable bending, while the second adhesive portion outside the bending area maintains strong adhesive force for structural integrity. This is achieved by selectively irradiating the first laser to the adhesive layer at the bending area to reduce adhesive force locally.
Solution Approach 2:
The adhesive layer is divided into functionally distinct segments: the first adhesive portion in the bending area and the second adhesive portion outside the bending area. Each segment serves a different purpose - one for flexibility and bending ease, the other for structural strength and stability.
2Ease of manufacture
If the passivation film is removed completely from the bending area, then the ease of bending is improved, but the protection of the display panel deteriorates
Solution Approach 1:
The passivation film is selectively removed only from the bending area where it would interfere with bending, while being maintained in other areas where it provides necessary protection. This is achieved by irradiating the second laser along the boundary of the bending area to remove the passivation film locally, extracting it only where needed.
Solution Approach 2:
The passivation film coverage is segmented into two regions: the bending area where the film is removed to enable flexibility, and the non-bending area where the film remains to provide protection. This spatial segmentation allows simultaneous achievement of bending capability and panel protection.
3Ease of manufacture
If a groove is provided in the passivation film and adhesive layer at the boundary of the bending area, then the ease of bending is improved, but the manufacturing complexity increases
Solution Approach 1:
The groove formation process replaces traditional mechanical cutting or drilling methods with laser irradiation. The second laser is used to irradiate along the boundary of the bending area, automatically forming the groove by removing material, thereby simplifying the manufacturing process despite the added geometric feature.
Solution Approach 2:
The groove is formed in advance at the boundary of the bending area before the final bending operation. This preliminary action of creating the groove facilitates the subsequent bending process by pre-defining the separation between the bending and non-bending areas, making the overall manufacturing more efficient.
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
Enables easy manufacturing of a display device with a bending area by reducing adhesive forces and allowing for the removal of passivation film and adhesive layers at the bending area, thereby simplifying the bending process and minimizing errors.
Implementation Method 1
reducing an adhesive force of the first adhesive portion of the adhesive layer to be smaller than an adhesive force of the second adhesive portion of the adhesive layer, by irradiating a first laser to the adhesive layer at the bending area
Implementation Method 2
removing a portion of the passivation film and a portion of the adhesive layer disposed at the boundary of the bending area, by irradiating a second laser to the passivation film and the adhesive layer along the boundary of the bending area
Data Source
AI summary
A manufacturing method of a display device, includes: providing a display module bendable at a bending area and including: a passivation film including a polyimide and disposed both in and outside of the bending area, and an adhesive layer attaching a display panel to the passivation film and including a first adhesive portion in the bending area and a second adhesive portion outside of the bending area; reducing an adhesive force of the first adhesive portion, by irradiating a first laser which is a CO2 laser to the adhesive layer at the bending area, to provide the first adhesive portion which has reduced adhesive force; providing a groove in the passivation film and the adhesive layer, along a boundary of the bending area; and removing the passivation film and the first adhesive portion which has the reduced adhesive force, from the display panel, at the groove.