Optical System for Uniform Frit Sealing in OLED Displays
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Solution Overview
Problem
Conventional sealing methods for organic light-emitting display devices fail to achieve uniform temperature distribution across the frit, leading to inadequate sealing and potential defects such as over-welding, voids, and residual stress due to non-homogeneous laser beam profiles.
Innovation Solution
An optical system that adjusts the beam profile to have constant intensity with concave sides, ensuring greater energy delivery to the edges of the frit, enhancing temperature homogeneity and reducing thermal stress during the sealing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sealing method is used, then the sealing process is simple, but the hermeticity and adhesion between substrates are insufficient
Solution Approach 1:
The patent changes the spatial distribution parameter of light energy by using an optical system to create a concave symmetric beam profile. This transforms a conventional uniform or Gaussian beam into one with enhanced edge energy concentration, optimizing the thermal distribution during sealing to improve hermeticity and adhesion without increasing system complexity
Solution Approach 2:
The patent applies asymmetry in the beam intensity distribution within a symmetric geometric framework. The concave symmetric beam profile creates asymmetric energy concentration at the edges compared to the center, allowing preferential heating at the sealing interfaces where it is most needed, thereby improving adhesion and hermeticity
2Stability of the object's composition
If uniform light intensity is used during sealing, then the process is simple, but temperature homogeneity across the sealing portion is poor
Solution Approach 1:
The patent applies local quality by creating a non-uniform light intensity distribution tailored to the specific thermal requirements of different regions. The concave symmetric beam profile concentrates energy at the edges where sealing occurs, while reducing intensity at the center, thereby achieving homogeneous temperature distribution across the sealing portion through localized energy optimization
Solution Approach 2:
The patent transforms the light intensity parameter from a uniform distribution to a concave symmetric distribution. This parameter change in the spatial profile of the laser beam enables controlled thermal gradients that promote uniform temperature across the sealing area, improving temperature homogeneity without excessive system complexity
3Strength
If high energy is concentrated at the center of the beam, then the beam structure is simple, but the adhesion at the sealing edges is insufficient
Solution Approach 1:
The patent applies local quality by redirecting energy concentration from the beam center to the beam edges. The concave symmetric beam profile creates localized high energy regions at the periphery where sealing adhesion is critical, while reducing energy at the center. This localized energy optimization directly improves edge adhesion strength without requiring complex beam control mechanisms
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 optical system improves the sealing process by maintaining uniform temperature across the frit, reducing defects and enhancing the strength and adhesion of the organic light-emitting display device.
Implementation Method 1
an enlarging optical system that enlarges a section of an incident light
Implementation Method 2
a first mirror that reflects a parallel light passing through the first lens, and a second mirror that reflects a parallel light that is reflected by the first mirror
Implementation Method 3
a reduction optical system that reduces a section of a light passing through the mask
Implementation Method 4
a fourth lens that makes a parallel light passing through the third lens form a focal point
Implementation Method 5
A light passing through the reduction optical system may be irradiated in the form of a spot beam... irradiated to a sealing portion arranged between first and second substrates and may be used for sealing the first and second substrates
Implementation Method 6
An optical system that irradiates a laser beam with a concave symmetric beam profile to the sealing portion between substrates, providing greater energy to the edges than the center
Data Source
AI summary
An optical system includes an enlarging optical system that enlarges a section of an incident light, a mask that passes some of a light passing through the enlarging optical system, and a reduction optical system that reduces a section of a light passing through the mask.