OLED Insulation Layer Uniformity via Extraction
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Solution Overview
Problem
The manufacturing process of organic light-emitting display apparatuses faces defects during the formation of the insulation layer due to uneven application of materials caused by the electrode power supply line underneath, leading to incomplete coverage and non-uniform thickness.
Innovation Solution
The organic light-emitting display apparatus features a substrate with a first insulation layer and a conductive layer, where the conductive layer's end portion is positioned such that its surface is flush with the insulation layer's surface, and a second insulation layer with openings that correspond to the first, allowing for uniform material application and minimizing exposure of the conductive layer's edges, thereby preventing damage and ensuring smooth layer formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode power supply line is formed on the substrate, then electrical connection is achieved, but the insulation layer material cannot be smoothly applied due to the line underneath
Solution Approach 1:
The electrode power supply line is extracted from the common substrate surface and placed in a separate opening (first opening) formed in the first insulation layer. This allows the insulation layer material to be applied uniformly over the substrate without being obstructed by the power supply line, while the line still maintains its electrical connection function through the opening.
Solution Approach 2:
The first opening acts as an intermediary structure that accommodates the electrode power supply line. By providing this dedicated space, the opening mediates between the need for electrical connection (power supply line) and the need for uniform insulation layer application, allowing both requirements to be satisfied simultaneously.
2Reliability
If the conductive layer is positioned below the insulation layer surface, then electrical connection is maintained, but material application becomes uneven
Solution Approach 1:
The conductive layer is extracted from the bulk insulation layer and repositioned to extend into the first opening. This extraction allows the conductive layer to maintain its electrical connection function while being positioned such that it does not interfere with the uniform application of subsequent insulation layer materials.
Solution Approach 2:
The conductive layer is extended into the vertical dimension by reaching into the first opening. This dimensional change allows the conductive layer to maintain electrical connectivity while being positioned in a way that facilitates smooth material application over the substrate surface.
3Reliability
If the conductive layer end portion is exposed, then electrical connection is achieved, but the edges are prone to damage
Solution Approach 1:
The second insulation layer is applied beforehand to cover and protect the exposed end portion of the conductive layer. This protective layer cushions the conductive layer edges from potential damage during subsequent manufacturing processes, while the conductive layer maintains its electrical connection through the first opening.
Solution Approach 2:
The second insulation layer acts as an intermediary protective element that shields the vulnerable conductive layer edges. It mediates between the need for exposed conductive layer ends (for electrical connection) and the need to protect those ends from damage, providing mechanical protection while maintaining electrical functionality.
Data Source
AI summary
An organic light-emitting display apparatus includes: a substrate having a display area and a peripheral area surrounding the display area; a first insulation layer, which is located on the substrate across the display area and the peripheral area and comprises a first opening (e.g., a first groove or first hole) at the peripheral area; and a first conductive layer, which is located on the first insulation layer and has one end portion located in the first opening, wherein a distance between the top surface of the substrate and the top surface of the one end portion of the first conductive layer is smaller than or equal to a distance between the top surface of the substrate and the top surface of the first insulation layer, the portion of the one end portion of the first conductive layer being a portion of the first conductive layer toward an edge of the substrate.