Frit Composition for Laser Sealing OLED Displays
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Solution Overview
Problem
Existing OLED display panels face challenges in achieving effective sealing against oxygen and moisture due to the limited effective seal width of the frit, which is influenced by the heating and melting process during substrate bonding.
Innovation Solution
A display panel design that incorporates a frit with an optical density of more than 0.0683/μm for laser light in the 760 to 860 nm wavelength range, achieved by using vanadium-based or bismuth-based frit compositions with specific pigment content, to enhance the absorption of thermal energy and ensure a wider effective seal width during the sintering process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical density of the frit is increased to improve sealing capability, then the effective seal width increases, but the absorption of laser light may become excessive causing heating issues
Solution Approach 1:
The patent optimizes the optical density parameter of the frit to a specific range (0.0683/μm to 0.2/μm) to achieve the desired balance between sealing capability and laser absorption. This parameter optimization allows the frit to absorb sufficient laser energy for effective sealing while preventing excessive heat generation that could damage the display panel components.
Solution Approach 2:
The patent uses composite frit compositions containing specific metal oxides (vanadium oxide, bismuth oxide, manganese oxide, cobalt oxide, nickel oxide, or copper oxide) to achieve the target optical density. These composite materials provide both the necessary laser absorption characteristics and the required sealing performance without causing overheating issues.
2Reliability
If conventional frit compositions are used, then the manufacturing process is simple, but the effective seal width is insufficient to provide adequate sealing
Solution Approach 1:
The patent modifies the chemical composition parameters of the frit by incorporating specific metal oxides at controlled concentrations. This composition adjustment increases the optical density to the required range, thereby improving the effective seal width and sealing reliability while maintaining compatibility with existing manufacturing processes.
Solution Approach 2:
The patent employs composite frit materials containing combinations of metal oxides (vanadium oxide, bismuth oxide, manganese oxide, cobalt oxide, nickel oxide, or copper oxide) to achieve enhanced sealing performance. These composite compositions provide the necessary optical properties for effective laser sintering and sealing without significantly complicating the manufacturing process.
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 increased optical density of the frit composition leads to a larger effective seal width, effectively blocking outside air and moisture, thereby improving the sealing capability of the OLED display panel.
Implementation Method 1
the frit has an optical density of more than about 0.0683/μm for laser light of any one wavelength in a wavelength range of about 760 to about 860 nm
Implementation Method 2
sintering the fit composition by irradiating the laser light of the wavelength of 810 nm to the frit composition
Data Source
AI summary
Provided are display panel, method of manufacturing the same, and frit composition used in the display panel. A display panel comprising: a first substrate, a second substrate facing the first substrate and a frit bonding the first substrate and the second substrate together, wherein the frit has an optical density of more than about 0.0683/μm for laser light of any one wavelength in a wavelength range of about 760 to about 860 nm.