Transparent Spacers and Fillers for OLED Substrate Interval Control
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Solution Overview
Problem
Conventional organic light emitting display devices face issues with image distortion and increased weight as the size of the display increases, due to the sealing substrate contacting the organic light emitting device, leading to reduced impact resistance and manufacturing challenges.
Innovation Solution
The use of transparent insulating spacers and fillers with a refractive index difference of 0.4 or less, alternately arranged between the substrates, to maintain a uniform interval and improve impact resistance while allowing for easier substrate alignment during manufacturing, without reducing light emission or image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing substrate is arranged parallel to the substrate to seal the organic light emitting device, then the device is protected from oxygen and moisture, but the device droops due to weight as size increases, causing the sealing substrate to contact the organic light emitting device or image distortion to occur
Solution Approach 1:
The space between substrates is segmented into multiple regions by alternately arranging spacers and fillers. Spacers are positioned at specific locations to maintain interval, while fillers occupy remaining spaces. This segmentation prevents the sealing substrate from contacting the organic light emitting device while maintaining structural support.
Solution Approach 2:
Spacers and fillers act as intermediary elements between the first substrate and the second substrate. These intermediaries maintain a uniform interval, preventing direct contact between substrates that would cause image distortion, while still providing the sealing function.
2Strength
If spacers and fillers are alternately arranged to maintain uniform interval between substrates, then impact resistance and manufacturing ease are improved, but device complexity increases
Solution Approach 1:
The sealing function and the interval-maintaining function are merged into a single structure. The spacers and fillers simultaneously maintain the uniform interval between substrates and provide sealing, eliminating the need for separate sealing mechanisms and reducing overall structural complexity.
Solution Approach 2:
The spacers and fillers serve multiple functions: they maintain the uniform interval between substrates, provide sealing protection, improve impact resistance, and facilitate substrate alignment during manufacturing. This multi-functionality reduces the need for additional components.
Data Source
AI summary
An organic light emitting display device includes a first substrate, a plurality of organic light emitting devices on the first substrate, a second substrate arranged opposite and substantially parallel to the first substrate with the organic light emitting devices therebetween, a plurality of spacers between the organic light emitting devices and the second substrate, and a plurality of fillers alternately arranged with the spacers and configured to fill in space between the first substrate and the second substrate, wherein at least portions of the spacers overlap with a plurality of light emitting regions corresponding to the organic light emitting devices. The spacers and fillers are composed of transparent materials having refractive indexes similar to each other so that visibility and image quality are not lowered and the distance between the substrates is substantially constant.