OVJP Injection Block With Bellows for Stable Large-Area OLED Deposition
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Solution Overview
Problem
Existing methods for fabricating organic light-emitting diodes (OLEDs) face challenges in achieving precise and efficient deposition of organic materials without the use of fine metal masks or solvents, which are unsuitable for large-area displays.
Innovation Solution
The use of organic vapor jet printing (OVJP) technology, which includes a print die and an injection block with a flexible bellows and internal gas distribution manifold, allows for precise deposition of organic materials onto a substrate while maintaining temperature stability and vertical movement, enabling commercial-scale operation without the need for fine metal masks or solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional fabrication methods using fine metal masks or solvents are employed, then deposition can be achieved, but the method becomes unsuitable for large-area displays and causes performance degradation
Solution Approach 1:
The invention extracts and eliminates the problematic components (fine metal masks and solvents) from the fabrication process. By using organic vapor jet printing, the method removes the constraints imposed by masks and the performance-degrading effects of solvents, enabling direct deposition of organic materials onto large-area substrates without compromising quality
Solution Approach 2:
The invention replaces the mechanical mask-based deposition system with a vapor-phase direct deposition system. Instead of using physical masks to define patterns, the organic vapor jet printing method uses controlled vapor flow and condensation to achieve precise material deposition, eliminating the limitations of mechanical mask systems for large-area fabrication
2Area of stationary object
If precise deposition of organic materials is achieved without fine metal masks, then large-area displays can be manufactured, but temperature stability and vertical movement control become critical challenges
Solution Approach 1:
The invention introduces dynamic control mechanisms for the injection block, allowing vertical movement to optimize the distance between the print die and substrate. The system dynamically adjusts position during fabrication and maintains temperature stability through controlled heating, transforming a static deposition process into a dynamically adaptable one that can handle large-area substrates
Solution Approach 2:
The invention changes the physical parameters of the deposition system by implementing controlled heating of the injection block and print die. By maintaining elevated temperatures, the system prevents condensation of organic materials in the carrier gas stream, ensuring stable vapor flow and consistent deposition quality across large areas
3Productivity
If organic vapor jet printing is used for commercial-scale operation, then productivity increases, but the system requires sophisticated gas distribution and vacuum management
Solution Approach 1:
The invention segments the gas distribution function into a dedicated internal manifold system within the injection block. This manifold divides and directs carrier gas and vacuum flows to multiple print die locations simultaneously, enabling parallel fabrication across large substrates. The segmentation of gas distribution pathways allows independent control of different deposition zones, managing complexity through functional division
Solution Approach 2:
The invention implements a nested structure where the internal gas distribution manifold is embedded within the injection block, and multiple print die are arranged in a nested or array configuration. This nesting allows efficient space utilization and integrated gas distribution to multiple deposition sites, enabling commercial-scale productivity while managing system complexity through compact integration
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
OVJP facilitates the precise and efficient deposition of organic materials for OLEDs, overcoming the limitations of traditional methods by allowing large-area displays to be manufactured without performance degradation, thus enhancing production efficiency and quality.
Implementation Method 1
A flexible bellows may be disposed within the internal recess within the injection block and in fluid communication with the internal gas distribution manifold, which allows the injection block to move at least 150 μm, 300 μm, or more vertically relative to a fixed-position gas distribution system while maintaining a fluid connect between the print die and the injection block
Implementation Method 2
A heating element may be used to maintain a temperature within the injection block with a variation of 2° C. or less
Implementation Method 3
an internal gas distribution manifold to distribute carrier gas and/or vacuum to the print die
Implementation Method 4
The use of organic vapor jet printing (OVJP) technology, which includes a print die and an injection block with a flexible bellows and internal gas distribution manifold, allows for precise deposition of organic materials onto a substrate
Data Source
AI summary
A deposition device including an injection block and a print die is provided, which allows for vertical movement of the injection block while still maintaining connection between the print die and external gas sources. Also disclosed is an injection block suitable for such devices, which provides improved vertical range of motion and thermal consistency compared to conventional injection block devices.