Organic Light Emitting Device Color Filter Adhesion
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Solution Overview
Problem
In organic light emitting devices, the adhesion of color filters is weak, particularly in subpixels with smaller areas, leading to potential peeling issues which can result in defects and reduced display quality.
Innovation Solution
A manufacturing method for organic light emitting devices that includes forming color filters with varying areas, where the smaller area filters are formed after the larger ones, and incorporating a transparent layer to enhance adhesion and prevent mechanical stress-induced defects, while maintaining a process temperature below 110°C to minimize thermal degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the color filter layer is formed at a low temperature to suppress deterioration of the light emitting layer, then thermal degradation is reduced, but adhesion of the color filter layer becomes weak
Solution Approach 1:
The patent changes the formation temperature parameter from high temperature to low temperature (below 110°C) to suppress thermal degradation of the organic light emitting layer, while accepting the trade-off of reduced adhesion that is compensated by other means
Solution Approach 2:
The patent applies a preliminary action by forming a sealing layer before forming the color filter layer. This sealing layer serves as an adhesion promoter that compensates for the weak adhesion caused by low-temperature formation of the color filter layer
2Reliability
If the area of color filters for predetermined subpixels is made smaller to adjust color balance or reduce current load, then color balance is improved, but adhesion becomes even weaker and peeling is more likely
Solution Approach 1:
The patent applies preliminary action by forming the sealing layer before the color filter layer, creating a stable base that enhances adhesion of smaller-area color filters that would otherwise be prone to peeling
Solution Approach 2:
The patent applies local quality by providing the sealing layer as a localized adhesion-enhancing structure beneath specific color filter regions, particularly benefiting smaller-area filters where adhesion is most critical
Data Source
AI summary
A manufacturing method of an organic light emitting device including a light emitting element that includes an organic light emitting layer, a sealing layer above the light emitting element, and a color filter layer above the sealing layer. The color filter layer includes a first color filter that transmits light of a first wavelength region and a second color filter that transmits light of a second wavelength region, an area of the second color filter is smaller than an area of the first color filter, and the method includes forming the first color filter, and forming the second color filter thereafter.