OVJP Print Head Active Cooling Heat Sink
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Solution Overview
Problem
Current organic light emitting diode (OLED) fabrication techniques face challenges in achieving efficient and cost-effective production, particularly in creating saturated color emissions for full-color displays, as they require precise control over organic material deposition and layer structures to optimize light emission efficiency and stability.
Innovation Solution
The use of organic vapor jet printing (OVJP) technology with a print head configuration that includes heaters and heat sinks to maintain precise temperature control and ambient temperature management, allowing for the deposition of organic materials on substrates with high precision and efficiency, enabling the formation of efficient OLED devices with enhanced light emission properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional OLED fabrication techniques are used to achieve saturated color emissions, then precise control over organic material deposition and layer structures is required, but this increases manufacturing complexity and reduces production efficiency
Solution Approach 1:
The patent replaces conventional mechanical deposition methods with organic vapor jet printing technology. The OVJP system uses a print head that generates organic vapor jets which are deposited directly onto the substrate, eliminating the need for complex vacuum deposition equipment and multiple processing steps. This substitution of mechanical systems with a more direct vapor-phase process achieves both high precision deposition and improved production efficiency
Solution Approach 2:
The patent implements precise temperature control through actively cooled heat sinks and heated stages. By dynamically adjusting temperature parameters during the OVJP process, the system optimizes organic material deposition rates and film quality. The temperature control system maintains the substrate at optimal temperatures for vapor deposition while the heat sinks prevent overheating of the print head, enabling sustained high-speed production without sacrificing deposition precision
2Temperature
If active cooling systems are added to the OVJP print head, then temperature control precision is improved, but device complexity increases
Solution Approach 1:
The patent integrates the active cooling system directly into the print head structure by incorporating heat sinks with cooling channels within the print head body. This merging of cooling functionality into the existing print head design allows for precise temperature control without adding separate, complex cooling apparatus. The cooling channels are embedded in the print head's thermal management structure, creating a unified system that achieves temperature precision while minimizing additional complexity
Solution Approach 2:
The patent uses heat sinks as intermediary thermal management components between the heated stage and the surrounding environment. The heat sinks act as thermal buffers that absorb excess heat from the print head and dissipate it through controlled conduction and convection. This intermediary approach provides precise temperature control by mediating heat flow, preventing thermal runaway while maintaining simple overall system architecture through passive thermal management
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 enables the production of OLEDs with improved light emission efficiency, stability, and cost-effectiveness by precisely controlling the deposition of organic layers, thereby addressing the challenges of achieving saturated color emissions and optimizing device performance.
Implementation Method 1
a heat sink disposed adjacent to the heater and separated from the heater by an air gap
Implementation Method 2
actively cooled heat sink
Implementation Method 3
a first heater disposed on a first side of the OVJP print head; and a second heater disposed on a second side of the OVJP print head
Implementation Method 4
organic vapor jet printing (OVJP) technology with a print head configuration that includes heaters and heat sinks to maintain precise temperature control and ambient temperature management, allowing for the deposition of organic materials on substrates
Data Source
AI summary
An organic vapor jet printing (OVJP) device is provided that includes an OVJP print head having a nozzle configured to eject an organic material entrained in a carrier gas, one or more heaters to heat the nozzle, and one or more heat sinks to remove heat from the region of the nozzle. OVJP deposition devices and techniques are also provided in which heat sinks are arranged in the region of one or more OVJP nozzle, which maintain an ambient temperature of not more than 40 C. when the print head is operated at an operating temperature of 450 C.