OLED Boundary Layer Mitigates Laser Thermal Damage
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Solution Overview
Problem
Laser-induced thermal imaging in OLED display manufacturing causes thermal damage to the resonance assistance layer and hole transport layer, leading to carrier accumulation and increased driving voltage, which deteriorates the interface characteristics and reliability of the organic light emitting diode.
Innovation Solution
Incorporating a boundary layer with a melting point of 80° C to 170° C, such as NDP-9 or HAT-CN, between the resonance assistance layer and the hole transport layer, and forming a pixel boundary layer between the pixel electrode and the hole injection layer, to minimize thermal damage and improve carrier transmission ratios during the laser induced thermal imaging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser induced thermal imaging is used to form emission layers, then precise patterning and dry process advantages are achieved, but thermal damage to the resonance assistance layer and hole transport layer occurs
Solution Approach 1:
A boundary layer is introduced as an intermediary component between the hole transport layer and the resonance assistance layer/organic emission layer. This boundary layer absorbs excess thermal energy from the laser irradiation process, preventing direct thermal damage to the resonance assistance layer and hole transport layer while allowing the laser-induced thermal imaging process to proceed effectively for precise patterning.
2Manufacturing precision
If laser induced thermal imaging is used, then emission layers can be precisely patterned, but carrier accumulation is generated in the interface between hole transport layer and organic emission layer
Solution Approach 1:
The boundary layer serves as a mediator at the interface between the hole transport layer and the organic emission layer, preventing carrier accumulation by facilitating proper charge transport and distribution across the interface, thereby maintaining reliable device operation while enabling precise emission layer patterning through laser induced thermal imaging.
3Productivity
If laser induced thermal imaging is used, then the process is dry and efficient, but driving voltage is excessively increased due to thermal damage
Solution Approach 1:
The boundary layer acts as a thermal buffer that protects the functional layers from excessive thermal damage during the efficient dry laser induced thermal imaging process, preventing the degradation that would lead to increased driving voltage, thus maintaining both manufacturing efficiency and low power consumption.
4Productivity
If laser induced thermal imaging is used, then emission layers are formed efficiently, but thermal damage to the anode and hole injection layer occurs
Solution Approach 1:
The boundary layer serves as a protective intermediary that absorbs and dissipates thermal energy, preventing thermal damage from propagating to the anode and hole injection layer during the efficient emission layer formation process, thereby maintaining both high productivity and structural integrity.
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
The solution effectively reduces thermal damage, prevents excessive driving voltage increases, and enhances the reliability and lifespan of the OLED display by improving the interface characteristics between the resonance assistance layer and the hole transport layer.
Implementation Method 1
thermal energy is transmitted to a hole transport layer (HTL) in the laser induced thermal imaging process
Implementation Method 2
laser induced thermal imaging using a laser
Implementation Method 3
thermal energy is transmitted to a hole transport layer (HTL) in the laser induced thermal imaging process
Implementation Method 4
The injected electrons and holes are combined to form excitons and the excitons emit light as discharge energy
Data Source
AI summary
An organic light emitting diode (OLED) display includes a red pixel, a green pixel, and a blue pixel. The red pixel, the green pixel and the blue pixel each includes: a pixel electrode; a hole auxiliary layer on the pixel electrode; a blue organic emission layer on the hole auxiliary layer; an electron auxiliary layer on the blue organic emission layer; and a common electrode on the electron auxiliary layer. The red pixel and the green pixel include: a red boundary layer and a green boundary layer, respectively; a red resonance assistance layer and a green resonance assistance layer, respectively; and a red organic emission layer and a green organic emission layer formed between the red resonance assistance layer and the blue organic emission layer, and between the green resonance assistance layer and the blue organic emission layer, respectively.