Porous Thermal Insulation Layer for OLED Heat Management
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Solution Overview
Problem
In top-emitting OLED display panels, the high temperature required for forming auxiliary electrodes can damage the underlying organic light-emitting layer due to heat transfer, leading to high yield loss and performance issues.
Innovation Solution
A method involving a porous thermal insulation layer with low thermal conductivity is used to isolate the organic light-emitting layer, combined with a two-step curing process for the auxiliary electrode: a first curing at a low temperature and a second curing with low-frequency alternating current at a higher temperature, confining the high temperature region above the insulation layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If high temperature curing is applied to form auxiliary electrodes, then the auxiliary electrode formation is achieved, but the organic light-emitting layer is damaged due to heat transfer
Solution Approach 1:
The patent introduces a thermal insulation layer that segments the device into two thermal zones: an upper region for high-temperature auxiliary electrode curing and a lower region for protecting the organic light-emitting layer. This spatial segmentation allows independent temperature control in different regions, enabling auxiliary electrode formation at high temperature while maintaining the organic layer at safe temperatures.
Solution Approach 2:
The thermal insulation layer acts as an intermediary component between the auxiliary electrode and the organic light-emitting layer. It mediates the thermal interaction by blocking heat transfer from the high-temperature curing zone to the temperature-sensitive organic layer, thus protecting the organic layer while allowing the curing process to proceed.
2Object-affected harmful factors
If thermal insulation layer is added to protect organic layer, then heat damage is reduced, but device structure becomes more complex
Solution Approach 1:
The thermal insulation layer is integrated into the existing device architecture and serves multiple functions: it provides thermal insulation to protect the organic layer, maintains structural integrity during processing, and can serve as part of the overall device encapsulation or support structure. This multi-functionality reduces the need for additional separate protective components.
Solution Approach 2:
The thermal insulation layer is strategically positioned only where heat transfer occurs between the auxiliary electrode and organic layer, providing localized protection exactly where needed. This targeted approach avoids adding insulation material throughout the entire device, thereby minimizing structural complexity while achieving the necessary thermal protection.
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 effectively reduces heat transfer to the organic light-emitting layer, minimizing damage and improving the yield and performance of the OLED display panel by maintaining the integrity of the underlying layers.
Implementation Method 1
forming a thermal insulation layer on the bank layer... The porous thermal insulation layer may have a low thermal conductivity of about 0.01 W/mk to about 0.5 W/mK
Implementation Method 2
performing a second curing of the first metal grid at a second temperature by applying a low frequency alternating current to the first metal grid
Data Source
AI summary
A display panel may include a substrate (12), a bank layer (14) on the substrate (12), and a thermal insulation layer on the bank layer(14). The bank layer (14) defines a plurality of pixel areas (PA) on the substrate (12). The thermal insulation layer (20) may have a low thermal conductivity of about 0.01W/mk to about 0.5 W/mK. The thermal insulation layer (20) may be a porous thermal insulation layer.