OLED Packaging Structure with Segmented Cavities for Uniform Filling
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Solution Overview
Problem
OLED display apparatuses face challenges in packaging due to erosion by oxygen, moisture, and other air substances, leading to poor packaging reliability, luminescence uniformity, light leakage, and color shift issues caused by uneven filling adhesive dispensing.
Innovation Solution
A packaging structure comprising a first and second substrate with non-communicating sealed cavities and first sealing frames, where the first filler is dispensed and cured within each cavity, preventing interference between cavities and enhancing the filling effect, while the first sealing frames extend moisture and oxygen penetration paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single large sealed cavity is used to package OLED devices, then the packaging structure is simpler, but the filling adhesive dispensing becomes uneven causing light leakage and color shift
Solution Approach 1:
The patent divides a single large sealed cavity into multiple smaller sealed cavities (first sealed cavity, second sealed cavity, third sealed cavity, etc.). Each small cavity is filled with filling adhesive independently through its own filling hole. This segmentation prevents the filling adhesive from overflowing into adjacent areas and ensures uniform filling across the entire packaging structure, resolving the light leakage and color shift issues while maintaining reasonable structural complexity.
2Productivity
If filling adhesive is dispensed in a single large cavity, then the process is faster, but the adhesive overflows causing poor packaging reliability
Solution Approach 1:
The packaging structure is divided into multiple independent sealed cavities, each with its own filling hole. The filling adhesive is dispensed into each small cavity separately through controlled dispensing holes, preventing overflow into other areas. This segmentation maintains packaging reliability by containing the adhesive within designated boundaries while still achieving complete filling of each cavity.
Solution Approach 2:
Each sealed cavity is equipped with its own filling hole positioned at the appropriate location for that specific cavity. This local quality approach ensures that the filling adhesive is delivered precisely where needed in each cavity, preventing overflow into adjacent cavities or areas, thereby ensuring high packaging reliability.
3Object-affected harmful factors
If sealing frames are placed close together to reduce gaps, then the barrier effect is improved, but the manufacturing precision required increases
Solution Approach 1:
The patent introduces filling adhesive as an intermediary substance between the sealing frames and the OLED devices. The filling adhesive fills the gaps and spaces within each sealed cavity, creating an additional barrier against moisture and oxygen penetration. This intermediary approach enhances the protective barrier effect while tolerating reasonable manufacturing variations in sealing frame positioning, as the adhesive compensates for small gaps.
Data Source
AI summary
A packaging structure, a packaging method, and a display apparatus are disclosed. The packaging structure includes: a first substrate and a second substrate opposite to each other; a plurality of first sealing frames located between the first substrate and the second substrate, wherein the first substrate, the second substrate and the plurality of first sealing frames enclose a plurality of sealed cavities not communicating with each other, and each of the sealed cavities is configured to package at least one to-be-packaged unit of a to-be-packaged device; and a first filler located in the sealed cavity.