Buried Auxiliary Wire in Display Substrate
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Solution Overview
Problem
Existing display technologies face challenges in achieving clear images both indoors and outdoors while maintaining low power consumption, and in bonding self-light emitting and reflective pixels without surface roughness issues due to high surface resistance of carbon-based and inorganic-based transparent electrodes.
Innovation Solution
A display device structure incorporating a thin film transistor, self-light emitting pixel layer, and reflective pixel layer, with a substrate having buried auxiliary wires made of materials like aluminum, silver, or graphene, and a substrate with low surface roughness to facilitate bonding between the layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low-resistance auxiliary wires are introduced to reduce surface resistance, then electrical conductivity is improved, but height difference occurs causing bonding limitations
Solution Approach 1:
The auxiliary wire is embedded within a recess formed in the substrate, allowing the wire to be nested inside the substrate volume rather than protruding from the surface. This resolves the contradiction by providing low-resistance electrical connection through the auxiliary wire while maintaining a flat outer surface for proper bonding between display layers.
Solution Approach 2:
The solution moves the auxiliary wire from a surface-level feature to a subsurface feature by creating a recess. This dimensional change allows the wire to function electrically while being hidden within the substrate thickness, preventing surface height differences that would interfere with bonding.
2Illumination intensity
If carbon-based or inorganic-based transparent electrodes are used, then transparency is improved, but surface resistance increases
Solution Approach 1:
The patent employs a composite electrode structure combining a transparent electrode layer (carbon-based or inorganic-based for high transparency) with a separate auxiliary wire (metal-based for low resistance). This composite approach allows each material to contribute its superior property: the transparent electrode maintains optical clarity while the auxiliary wire embedded in the substrate provides low-resistance electrical pathways.
3Reliability
If self-light emitting pixels are manufactured first, then pixel performance is optimized, but bonding becomes difficult due to subsequent reflective pixel manufacturing processes
Solution Approach 1:
The auxiliary wires are embedded in the substrate and the bonding surfaces are prepared in advance, before the actual bonding process. This preliminary preparation ensures that when self-light emitting pixels and reflective pixels are bonded, the surfaces are already flat and ready, preventing degradation during the bonding process and maintaining pixel performance.
Data Source
AI summary
Provided is a display device and a method of manufacturing the same. The display device includes a thin film transistor, a first electrode electrically connected to the thin film transistor, a self-light emitting pixel layer disposed on the first electrode, a second electrode disposed on the self-light emitting pixel layer, a substrate in which an auxiliary wire is buried, the substrate being disposed on the second electrode, and a reflective pixel layer disposed on the substrate.