OLED Sealing Structure With Polymeric Bracket and Frit Seal
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Solution Overview
Problem
Organic light-emitting displays (OLEDs) are susceptible to damage from oxygen and moisture, requiring effective sealing to prevent degradation, but existing sealing methods may not provide sufficient hermeticity and are prone to cracking due to thermal expansion differences and lack of elasticity in metal brackets.
Innovation Solution
A frit seal is used between substrates to create a hermetic seal, and a bracket made of polymeric materials like plastic or high elastic organic materials is adhered to the substrates using adhesives like epoxy or acrylate resins to enhance sealing and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal caps or glass substrates are used for sealing OLEDs, then sealing effectiveness is improved, but adhesive strength and elasticity are insufficient
Solution Approach 1:
The patent uses a composite sealing structure combining frit seal (glass-based material) with polymeric bracket materials. The frit seal provides hermetic sealing properties while the polymeric bracket adds elasticity and adhesive strength, creating a composite system that resolves the contradiction between sealing effectiveness and adhesive strength.
Solution Approach 2:
The patent changes the material parameters of the bracket from traditional metal to polymeric materials, which have different mechanical properties including higher elasticity and better adhesive characteristics. This parameter change allows the bracket to provide both structural support and strong adhesion to the sealing structure.
2Strength
If metal brackets are used to support the display unit, then structural strength is improved, but elasticity and adhesive strength deteriorate
Solution Approach 1:
The patent changes the material parameters of the bracket from metal to polymeric materials, fundamentally altering the mechanical property profile. Polymeric materials provide adequate structural strength while simultaneously offering superior elasticity and shock absorption capabilities that metal lacks.
Solution Approach 2:
The polymeric bracket acts as a flexible supporting structure that can deform elastically under impact or thermal stress, then return to its original shape. This flexibility protects the fragile OLED components while maintaining structural integrity.
3Ease of manufacture
If conventional sealing methods are used, then manufacturing simplicity is maintained, but impact resistance and durability are insufficient
Solution Approach 1:
The patent employs a composite sealing and support system where frit seal provides hermetic sealing and the polymeric bracket provides impact resistance. This composite approach maintains manufacturing simplicity by using compatible materials that can be joined with standard adhesives while dramatically improving impact resistance and durability.
Solution Approach 2:
The polymeric bracket is designed to absorb and dissipate impact energy before it reaches the OLED components. The material's elasticity and damping properties provide beforehand cushioning against mechanical shocks, protecting the delicate display unit from damage.
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 frit seal and polymeric bracket combination effectively protects OLEDs from moisture and oxygen, while the polymeric bracket's elasticity improves impact resistance and adhesive strength, extending the device's lifespan and durability.
Implementation Method 1
a frit disposed between the non-pixel region of the first substrate and the second substrate for adhering the first and second substrates to each other
Implementation Method 2
an adhesive layer formed on a second side of the first substrate and for adhering the bracket to the first substrate
Implementation Method 3
at least one organic light emitting diode being formed at the pixel region
Data Source
AI summary
Disclosed are an organic light emitting display and a fabricating method of the same, which form a bracket by at least one material selected from the group consisting of a plastic, a reinforcement plastic, or a high elastic and high molecular organic material in order to enhance an adhesive strength and an elasticity of a substrate and a bracket adhered to each other by means of an adhesive. A first substrate includes a pixel region and a non-pixel region. At least one organic light emitting diode is formed at the pixel region and having a first electrode, an organic layer, and a second electrode. The non-pixel region is formed beside pixel region. A second substrate is bonded to a first side of the first substrate to seal the pixel region. A frit is disposed between the non-pixel region of the first substrate and the second substrate and adheres the first and second substrates to each other. A bracket is formed by at least one material selected from the group consisting of a plastic, a reinforcement plastic, or a high elastic and high molecular organic material. An adhesive is formed by at least one resin selected from the group consisting of epoxy, acrylate, urethane acrylate, and acrylate cyanide, and for adhering the bracket to the first substrate.