Laser Beam Irradiation for OLED Substrate Sealing
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Solution Overview
Problem
Existing methods for sealing organic light-emitting display devices are inadequate in preventing moisture and oxygen ingress, leading to reduced lifespan and efficiency, and are complicated to implement.
Innovation Solution
A laser beam irradiation apparatus is used to evenly distribute temperature across the sealing area by varying the intensity of the laser beam, ensuring uniform heating and improved adhesion between the OLED substrate and encapsulation substrate using a frit sealant, particularly in corner regions where non-uniform temperatures can cause damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing methods (laminating thin films or using sealants) are used, then the sealing process can be implemented, but the sealing effectiveness is insufficient and the process becomes complicated
Solution Approach 1:
The patent replaces mechanical sealing methods (laminating thin films, applying sealants) with laser beam irradiation to activate the frit material. The laser energy directly activates the frit to form a sealed structure, eliminating the need for complex mechanical assembly processes and providing more reliable sealing.
Solution Approach 2:
The patent changes the physical state of the frit material through laser-induced temperature changes. By controlling laser beam parameters (intensity, duration, distribution), the frit transitions from a inactive state to an activated sealed state, achieving reliable sealing through parameter control rather than mechanical means.
2Ease of manufacture
If uniform laser beam intensity is used for sealing, then the process is simple, but corner sections experience non-uniform temperature distribution causing damage
Solution Approach 1:
The patent applies different laser beam intensities to different regions of the sealing area. Corner sections receive adjusted intensity compared to central regions, creating a non-uniform intensity distribution that compensates for geometric differences and achieves uniform temperature distribution across the entire sealing area.
Solution Approach 2:
The patent dynamically adjusts laser beam parameters (intensity distribution) based on the spatial position within the sealing area. The system transitions from a static uniform intensity approach to a dynamic position-dependent intensity control, ensuring optimal temperature distribution across varying geometries.
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 method enhances the airtightness and adhesive strength of the seal, preventing moisture and oxygen ingress, thereby extending the lifespan and maintaining efficiency of the organic light-emitting display devices.
Implementation Method 1
irradiating a laser beam on the sealing part of each organic light-emitting display device while moving a laser beam irradiation apparatus to harden the frit
Implementation Method 2
a laser beam irradiation apparatus... irradiating a laser beam on the sealing part
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
Provided is a laser beam apparatus for sealing a first substrate (210) and a second substrate (220) by irradiating a sealant (240) between the first substrate (210) and the second substrate (220) using a laser beam (260), the laser beam apparatus including a controller, wherein the controller is configured to defocus the laser beam (260) and to move a scanning central axis of the laser beam (260) across a sealing path of the sealant (240).