OLED Encapsulation Substrate Concave Feature for Seal Pattern Uniformity
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Solution Overview
Problem
The existing OLED structure faces challenges in controlling the width of the seal pattern due to errors in the amount of seal pattern material coated between substrates, leading to increased bezel width and potential overlap onto active areas, with no current solution to address this issue effectively.
Innovation Solution
The shape of the encapsulation substrate is modified to include a concave part with a specific depth and obtuse-angle lateral surface, allowing for uniform coating and accommodation of excessive seal pattern material, integrating the seal pattern and filling seal pattern to maintain a consistent width and prevent overflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the seal pattern is coated with the same width method, then the manufacturing process is simple, but the width of the seal pattern cannot be controlled uniformly due to material accumulation at overlapping start and end points
Solution Approach 1:
The encapsulation substrate is designed with a concave part at the location where the seal pattern starts and ends, creating a localized structural variation. This concave part provides extra space to accommodate the accumulated seal pattern material, allowing the seal pattern width to remain uniform in the visible regions while the excess material is contained within the concave area.
Solution Approach 2:
The concave part is pre-formed on the encapsulation substrate before the seal pattern coating process. This preliminary structural preparation ensures that when the seal pattern material is applied and overlaps at the start and end points, the excess material has a predetermined space to accumulate without affecting the uniform width appearance of the seal pattern.
2Strength
If excessive pressure is applied during substrate adherence, then the substrates bond more strongly, but the seal pattern material spreads further causing the seal pattern to overlap onto the active area
Solution Approach 1:
The concave part creates a localized containment zone with different geometric properties compared to the flat regions. When pressure is applied during substrate adherence, the seal pattern material is contained within the boundaries of the concave part, preventing lateral spreading onto the active area while still allowing strong bonding between substrates.
Solution Approach 2:
The concave part acts as a pre-prepared cushioning space that absorbs the excess seal pattern material and prevents it from spreading to harmful areas. This structural cushioning is built in advance and protects the active area from material overflow during the pressure application process.
Data Source
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AI summary
An organic light emitting display device is disclosed. The organic light emitting display device is configured in such a way that a shape of an encapsulation substrate (200) is changed to correspond to start and end points (SP, EP) for coating a seal pattern material (3000) to have a uniform width of a seal pattern (300) for each region, thereby achieving a narrow bezel.