Halogen Lamp Sealing for Flat Display Substrate Stress Reduction
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Solution Overview
Problem
Existing sealing methods for organic light-emitting display devices are inadequate in preventing moisture and oxygen infiltration, leading to electrode oxidation, reduced lifespan, and inefficient light emission, especially in top-emitted devices, and cause stress-related crack defects during substrate attachment.
Innovation Solution
A sealing apparatus using a halogen lamp and reflector to irradiate light onto an attachment member, such as a frit, between substrates, ensuring uniform light exposure and minimizing stress differences across the substrate surface, thereby enhancing adhesion and preventing crack defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laser beam is used to harden the frit for sealing, then the sealing effectiveness is improved, but stress concentration and crack defects occur at the cutting surface
Solution Approach 1:
The patent replaces the laser beam (optical system) with a halogen lamp (thermal system) for heating the frit. This substitution changes the heating mechanism from high-intensity focused optical energy to more diffuse thermal radiation, reducing stress concentration while achieving the same hardening effect. The halogen lamp provides gentler, more uniform heating that prevents crack defects at the cutting surface.
Solution Approach 2:
The patent changes the heating parameters by using a halogen lamp instead of a laser beam. This involves changing from high-intensity, focused, rapid heating to lower-intensity, diffuse, controlled heating. The parameter change in heating rate and distribution allows the frit to harden effectively while minimizing thermal stress and preventing crack formation.
2Ease of manufacture
If conventional sealing methods are used, then the process is simpler, but moisture and oxygen infiltration occurs leading to electrode oxidation
Solution Approach 1:
The patent utilizes the phase transition of the frit material from soft to hard state through controlled heating with a halogen lamp. This phase transition creates a strong, hermetic seal between substrates that effectively prevents moisture and oxygen infiltration, while the gradual heating process maintains manufacturing simplicity.
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 solution effectively seals organic light-emitting display devices by minimizing stress and preventing moisture infiltration, extending device lifespan and maintaining light-emitting efficiency while reducing crack defects during substrate attachment.
Implementation Method 1
a halogen lamp irradiating light; and a reflector reflecting light irradiated from the halogen lamp to the attachment member
Implementation Method 2
a halogen lamp irradiating light; and a reflector reflecting light irradiated from the halogen lamp to the attachment member
Implementation Method 3
irradiating light to the attachment member... to harden the attachment member melted by the irradiated light
Data Source
AI summary
A sealing apparatus and a method of manufacturing a flat display device using the sealing apparatus. The sealing apparatus to attach a first substrate and a second substrate to each other using an attachment member disposed between the first and second substrates, the sealing apparatus comprises a stage on which the first substrate is seated, a halogen lamp irradiating light, and a reflector reflecting light irradiated from the halogen lamp to the attachment member.