Rotatable Auger Feeding for OLED Vaporization
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Solution Overview
Problem
The existing methods for vaporizing organic materials in OLED device manufacturing face challenges such as material degradation due to high temperatures, low deposition rates, frequent source recharging, and gradient effects in co-deposition, leading to inefficiencies and limitations in throughput and device architecture.
Innovation Solution
A method involving a rotatable auger to meter and agitate powdered material, with a heated surface and thermally conductive path to a heat sink, allowing controlled vaporization while minimizing thermal exposure, and using closed-loop control to optimize vaporization rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the heater temperature is increased to improve vaporization rate, then the deposition rate increases, but the organic material degrades due to thermal exposure
Solution Approach 1:
The patent feeds organic material directly to the heated surface where it is rapidly vaporized and deposited immediately, skipping the problematic intermediate state of holding material at elevated temperature for extended periods. This rush-through approach minimizes thermal exposure time while maintaining high deposition rates.
Solution Approach 2:
The patent extracts only the necessary amount of material from the bulk storage and delivers it directly to the vaporization zone, avoiding heating the entire material charge to vaporization temperature. This extraction approach limits the quantity of material exposed to harmful temperatures.
2Object-affected harmful factors
If small quantities of organic material are loaded in sources to minimize thermal exposure, then material degradation is reduced, but the operation time of the source becomes very short
Solution Approach 1:
The patent segments the material delivery process into controlled portions, feeding material continuously at a regulated rate rather than loading the entire charge at once. This segmentation allows extended operation time while maintaining minimal thermal exposure for each portion of material.
Solution Approach 2:
The patent implements continuous feeding of material to the vaporization surface, eliminating idle time between material loads. This continuous action maintains optimal deposition rates throughout extended operation periods without requiring frequent source recharging.
3Stability of the object's composition
If the entire organic material charge is heated to the same temperature, then vaporization is uniform, but it becomes impractical to mix additional organic materials such as dopants with host material
Solution Approach 1:
The patent applies heating locally at the vaporization surface rather than uniformly throughout the entire material charge. This localized heating allows different materials (host and dopants) to be mixed in the bulk while only the surface layer undergoes vaporization, preserving both uniform deposition and mixing versatility.
4Adaptability or versatility
If multiple separate sources are used to co-deposit host and dopant materials, then material composition flexibility is improved, but the device complexity and chamber size increase
Solution Approach 1:
The patent merges multiple materials (host and various dopants) into a single mixed charge that is delivered to one vaporization surface. This consolidation replaces the need for multiple separate sources, reducing device complexity and chamber size while maintaining the ability to co-deposit all materials in controlled proportions.
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 approach enhances the uniformity and efficiency of material delivery, reduces power consumption, and allows for improved mixing of materials, increasing the reliability and throughput of OLED manufacturing by maintaining material quality and reducing the need for multiple sources.
Implementation Method 1
heated surface to vaporize the material
Implementation Method 2
the feeding location is heated by radiation
Implementation Method 3
providing a thermally conductive path from the feeding location to a heat sink
Implementation Method 4
as the rotatable auger rotates, the powdered material is transported along a feed path
Implementation Method 5
agitating the powdered material in proximity to the feeding location in cooperation with the rotatable auger so as to facilitate controlled flow
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A method for metering powdered or granular material (10) onto a heated surface (40) to vaporize such material. The method comprises providing a rotatable auger (20) for receiving powdered or granular material and as the rotatable auger rotates, such rotatable auger translates such powdered or granular material along a feed path to a feeding location (30) . The method also providing at least one opening (35) at the feeding location such that the pressure produced by the rotating rotatable auger at the feeding location causes the powdered or granular material to be forced through the opening onto the heated surface in a controllable manner. The material is agitated or fluidized proximate to the feeding location.