Sequential Laser Sealing for Display Device Bonding
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Solution Overview
Problem
Organic light emitting display devices are prone to reduced lifespan and luminous efficiency due to environmental moisture and oxygen, which cause electrode oxidation and delamination, and existing sealing methods are inadequate in completely blocking harmful elements.
Innovation Solution
A laser irradiation apparatus is used to bond substrates with bonding members, minimizing stress and eliminating fracture defects by sequentially irradiating a laser beam on bonding members between substrates, ensuring effective sealing and protection from environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a laser beam is irradiated on bonding members to bond substrates, then bonding strength is improved, but stress concentration may cause fracture defects
Solution Approach 1:
The patent divides the bonding process into multiple sequential steps, irradiating different portions of bonding members in sequence rather than all at once. This segmentation of the laser irradiation process distributes the thermal stress over time and space, preventing stress concentration that would cause fracture defects while still achieving strong bonding.
Solution Approach 2:
The patent employs periodic laser irradiation by sequentially irradiating different portions of bonding members. The laser beam is moved to irradiate first portions, then second portions, and subsequent portions in a periodic manner. This periodic action allows stress to be managed systematically while maintaining bonding strength.
2Ease of manufacture
If conventional sealing methods are used, then manufacturing simplicity is maintained, but sealing effectiveness against moisture and oxygen is insufficient
Solution Approach 1:
The patent utilizes the phase transition of bonding members from solid to liquid and back to solid. The bonding members are irradiated with laser beams to melt them, then allowed to solidify, creating a sealed structure. This phase transition approach provides effective sealing while maintaining ease of manufacture, as the bonding members automatically form seals through melting and solidification without complex sealing 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 effectively seals the display device, reducing stress-induced defects and protecting it from moisture and oxygen, thereby enhancing the lifespan and efficiency of the organic light emitting display device.
Implementation Method 1
a laser oscillation member configured to irradiate a laser beam that melts the bonding members disposed between the first substrate and the second substrate
Implementation Method 2
a scanner configured to irradiate the laser beam incident from the laser oscillation member onto the bonding members, the scanner being configured to sequentially irradiate the laser beam on portions of the bonding members
Data Source
AI summary
A laser irradiation apparatus for bonding a first substrate and a second substrate of a display device by melting a plurality of bonding members disposed between the first and second substrates to define cells when the display device is manufactured, the display device including light emitting elements disposed on a surface of the first substrate such that the bonding members respectively encompass lateral regions of the light emitting elements, the laser irradiation apparatus including a stage on which the first substrate is mounted, a laser oscillation member configured to irradiate a laser beam that melts the bonding members disposed between the first substrate and the second substrate, and a scanner configured to irradiate the laser beam incident from the laser oscillation member onto the bonding members, the scanner being configured to sequentially irradiate the laser beam on portions of the bonding members.