Frit Seal Height Optimization for OLED Newton's Rings
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Solution Overview
Problem
Organic light emitting display devices face issues with Newton's rings due to air gaps between substrates, which affect image quality and can be exacerbated by the use of frit seals with insufficient height, leading to optical interference.
Innovation Solution
The implementation of a frit seal with a height between substrates ranging from about 10 to 300 μm to create an enclosed space around the organic light emitting pixels, preventing Newton's rings by ensuring a sufficient gap distance and using materials like magnesium oxide, calcium oxide, and glass frit for sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a frit seal with insufficient height is used to interconnect substrates, then the device complexity is reduced and manufacturing is simplified, but Newton's rings occur due to optical interference from air gaps, deteriorating image quality
Solution Approach 1:
The patent applies parameter changes by optimizing the frit seal height to a specific range (10-300 μm) to eliminate Newton's rings. By changing the height parameter of the frit seal, the optical path difference is controlled to prevent interference patterns while maintaining structural integrity and simplified manufacturing.
2Manufacturing precision
If the gap distance between substrates is increased to prevent Newton's rings, then image quality is improved, but the volume of the enclosed space increases and more sealing material is required
Solution Approach 1:
The patent optimizes the gap distance parameter within a specific range (10-300 μm) to prevent Newton's rings while minimizing enclosed space volume. This parameter optimization ensures that the gap is sufficient to eliminate optical interference patterns but not so large as to unnecessarily increase device volume or sealing material requirements.
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
This solution effectively prevents the occurrence of Newton's rings, thereby enhancing the image quality of organic light emitting display devices by maintaining a controlled air gap and using appropriate sealing materials to inhibit moisture and oxygen exposure.
Implementation Method 1
a frit seal interconnecting the first and second substrates while surrounding the array, wherein the frit seal, the first substrate and the second substrate in combination define an enclosed space in which the array is located
Implementation Method 2
the top surface and the inner surface has a gap therebetween, wherein the gap has a gap distance measured between the top surface and the inner surface
Data Source
AI summary
Provided is an organic light emitting display device (OLED) for preventing Newton's rings to improve image quality. An organic light emitting display device according to one embodiment of the present invention comprises a first substrate comprising a single layer or multiple layers; a second substrate comprising a single layer or multiple layers, the second substrate comprising an inner surface facing the first substrate; an array of organic light emitting pixels formed on the first substrate and interposed between the first and second substrates, the array comprising a top surface opposing the inner surface of the second substrate, wherein the top surface and the inner surface has a gap therebetween, and the gap has a gap distance measured between the top surface and the inner surface; and a frit seal interconnecting the first and second substrates while surrounding the array, wherein the frit seal, the first substrate and the second substrate in combination define an enclosed space in which the array is located, wherein the frit seal has a height between the first and second substrates so as to form the gap distance equal to or greater than about 10 μm.