Display Apparatus Conductive Layer Insulation
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Solution Overview
Problem
Existing display apparatuses face challenges in preventing shorts among conductive layers due to improper patterning during manufacturing, leading to defects and reduced image quality, especially in high-resolution displays with increased pixel density.
Innovation Solution
The display apparatus incorporates a substrate with conductive layers directly contacting inorganic layers, utilizing an interlayer insulating layer, first and second inorganic layers with openings, and a planarization layer to ensure proper electrical connections and prevent shorts, while also using an organic material layer to protect against impurities and stress during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the number of conductive layers and wires is increased to control emission correctly, then the emission control capability is improved, but the risk of shorts among conductive layers increases
Solution Approach 1:
An inorganic insulating layer is introduced as an intermediary between adjacent conductive layers. This inorganic layer acts as a mediator that provides reliable electrical insulation, preventing shorts while allowing the increased conductive layer configuration to maintain proper emission control.
Solution Approach 2:
The patent uses a composite structure combining organic insulating layers and inorganic insulating layers. The inorganic insulating layer is specifically positioned between conductive layers to provide enhanced insulation reliability, creating a multi-material system that addresses both emission control and short prevention requirements.
2Ease of manufacture
If conventional organic insulating layers are used between conductive layers, then the manufacturing process is simple, but shorts occur due to improper patterning
Solution Approach 1:
The inorganic insulating layer serves as a mediator that is less sensitive to patterning imperfections. Even if patterning is not perfectly precise, the inorganic layer provides sufficient insulation to prevent shorts, thereby decoupling manufacturing simplicity from patterning precision requirements.
Solution Approach 2:
The patent changes the material parameter of the insulating layer from organic to inorganic. This material parameter change results in different patterning tolerance characteristics, where the inorganic layer maintains insulation effectiveness even with less precise patterning, thus resolving the contradiction between manufacturing simplicity and patterning accuracy.
Data Source
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AI summary
A display apparatus includes a substrate, a circuit, and a pixel electrode. The substrate includes a display area (DA) and a peripheral area (BA) outside the display area. The circuit is disposed in the display area. The circuit includes a plurality of conductive layers, and each conductive layer contacts a corresponding inorganic layer arranged directly below the each conductive layer. The pixel electrode is arranged over the circuit and is electrically connected to at least one of the conductive layers.