Magnetic Pressing for AMOLED Laser Sintering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional packaging methods for AMOLED display devices using laser sintering of frit often result in the Newton's Ring phenomenon due to non-uniform vacuum pressing forces, leading to substrate and cover plate deformation, which increases production costs and reduces yield.
Innovation Solution
A method and apparatus that utilize a magnetic mechanism with a metal mask layer and magnetic material layer to apply a uniform pressing force on the display device, reducing the reliance on vacuum pressing and eliminating the need for supporting spacers, thereby adjusting the magnetic force according to the actual state of the substrate and frit paste to prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum pressing method is used to maintain tight contact between substrate and frit surface, then the gap requirement for laser sintering is met, but substrate and cover plate deformation occurs leading to Newton's Ring phenomenon
Solution Approach 1:
A magnetic pressing mechanism is introduced as an intermediary force application system between the substrate and cover plate. The mechanism uses magnetic attraction force to apply uniform pressing force during laser sintering, preventing direct vacuum-induced deformation while maintaining the required tight contact (gap < 0.1 μm) between substrate and frit surface.
Solution Approach 2:
The pressing force application method is changed from vacuum pressure to magnetic attraction force. By controlling the magnetic field strength, uniform pressing force can be applied without the non-uniform stress distribution caused by vacuum pressing, thus preventing substrate and cover plate deformation while maintaining adequate contact for laser sintering.
2Manufacturing precision
If vacuum degree is increased to improve substrate contact with frit surface, then laser sintering quality improves, but Newton's Ring phenomenon becomes more serious
Solution Approach 1:
Magnetic pressing mechanism serves as an intermediary that decouples the relationship between vacuum degree and pressing force. The magnetic force provides the necessary uniform pressing action independently of vacuum level, allowing adequate substrate-frit contact for laser sintering without relying on high vacuum that causes Newton's Ring phenomenon.
Solution Approach 2:
The vacuum pressing mechanism is replaced with a magnetic pressing mechanism. Instead of using vacuum pressure to achieve contact, magnetic attraction force is used to apply uniform pressing force, eliminating the harmful effect of high vacuum on substrate and cover plate shape while maintaining adequate contact quality for laser sintering.
3Shape
If supporting spacers are used to prevent deformation, then Newton's Ring phenomenon is reduced, but production costs increase and yield decreases
Solution Approach 1:
The supporting spacers are removed from the packaging structure. Instead of using mechanical spacers to prevent deformation, the patent employs a magnetic pressing mechanism that applies uniform force throughout the substrate-cover plate assembly, eliminating the need for discrete supporting elements and their associated costs and complexity.
Solution Approach 2:
Mechanical supporting spacers are replaced with a magnetic field-based pressing system. The magnetic mechanism provides continuous uniform support across the entire substrate area during laser sintering, eliminating the need for discrete supporting spacers and reducing production complexity and cost.
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 approach effectively reduces the occurrence of the Newton's Ring phenomenon, allows for uniform force application during laser sintering, and decreases production costs by eliminating the need for supporting spacers, thereby increasing the yield of display devices.
Implementation Method 1
providing a magnetic mechanism which clamps the glass cover plate and the glass substrate from top to bottom and applies a uniform pressing force on the effective light emitting region of the display device
Implementation Method 2
providing a laser beam penetrating the glass cover plate and focusing on the sealing adhesive layer to sinter the sealing adhesive layer
Implementation Method 3
laser sintering of frit
Implementation Method 4
the glass substrate and the glass cover plate being pressed in vacuum
Data Source
AI summary
The present application provides a method for packaging a display device and an apparatus therefor. The method includes: providing a display device, a platform, a laser beam and a magnetic mechanism; wherein the display device includes a light emitting element, the light emitting element includes at least one effective light emitting region thereon and is prepared on an upper surface of a glass substrate, the glass substrate is bonded to a glass cover plate via a sealing adhesive layer; the display device is placed on the platform; the laser beam penetrates the glass cover plate and focuses on the sealing adhesive layer to sinter the sealing adhesive layer; and the magnetic mechanism clamps the glass cover plate and the glass substrate from top to bottom and applies a uniform pressing force on the effective light emitting region of the display device.