Organic EL Device Fabrication via Mask Alignment
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Solution Overview
Problem
Roll-to-roll processes for fabricating organic electro-luminescence devices face significant alignment issues between stacked layers, leading to low yield rates due to substrate deviation during mass production.
Innovation Solution
The method involves forming a series of masks and conductive layers on a flexible substrate, with patterned organic functional layers encapsulating electrodes to prevent mis-alignment, using a sequence of masking and evaporation processes to ensure precise alignment and electrical connectivity between layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If roll-to-roll processes are used for mass production, then productivity is improved, but manufacturing precision deteriorates due to substrate deviation causing mis-alignment between stacked layers
Solution Approach 1:
The fabrication process is divided into multiple sequential steps with intermediate drying stages. The organic functional layer formation is segmented into deposition and drying phases, allowing precise control at each stage while maintaining high-speed roll-to-roll production capability
Solution Approach 2:
The substrate is pre-treated with a release layer before organic functional layer deposition. This preliminary action prevents adhesion between the organic layer and substrate during processing, enabling precise alignment and easy removal without damaging underlying layers, thus resolving the mis-alignment issue while maintaining productivity
2Adaptability or versatility
If multiple layers are stacked to form organic electro-luminescence devices, then device functionality is improved, but device complexity increases leading to alignment difficulties
Solution Approach 1:
A release layer is introduced as an intermediary between the substrate and the organic functional layer. This intermediate layer facilitates precise positioning and alignment during the stacking process, and enables clean separation when needed, thereby reducing alignment complexity while maintaining multi-layer device functionality
Solution Approach 2:
The process utilizes controlled drying parameters and deposition conditions to manage the physical state of organic materials during layer formation. By changing parameters such as drying speed, temperature, and deposition rate, the method achieves precise alignment of multiple layers without increasing overall process complexity
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 minimizes mis-alignment between stacked layers, enhancing the yield rate of organic electro-luminescence devices and facilitating cost-effective mass production by ensuring precise layer alignment and preventing short circuits.
Implementation Method 1
forming a patterned organic functional layer by shielding of a second mask, the patterned organic functional layer covering the first mask and the first electrode exposed by the first mask
Data Source
AI summary
A method for fabricating an organic electro-luminescence device, comprising: forming a first conductive layer comprising a first electrode and a contact pattern on a substrate; foil ling a first mask on the first conductive layer, the first mask comprising an opening for exposing a portion of the first electrode and a portion of the contact pattern; forming a patterned organic functional layer by shielding of a second mask, the patterned organic functional layer covering the first mask and the first electrode exposed by the first mask, and the second mask being disposed over the first mask to shield the portion of the contact pattern exposed by the opening; forming a second conductive layer and patterning the second conductive layer by removing the first mask and a portion of the second conductive layer on the first mask to form a second electrode electrically connected to the contact pattern.