Insulating Layer Grooves for OLED Pad Connection Reliability
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Solution Overview
Problem
Existing organic light emitting display apparatuses face challenges in achieving durable and reliable connections between the driving circuit unit and the substrate, leading to potential interference from conductive balls and reduced coupling forces, which affects the overall durability and performance of the display.
Innovation Solution
The use of an insulating layer with strategically formed contact holes and grooves, combined with an anisotropic conductive film featuring conductive balls, enhances the coupling between the driving circuit unit and the substrate by ensuring proper alignment and spacing of conductive elements, thereby improving the bonding process and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive balls are used to connect the driving circuit unit and pad units, then electrical connection is achieved, but interference between conductive balls and potential damage to pad units occurs
Solution Approach 1:
The insulating layer acts as an intermediary between the conductive balls and pad units, providing a controlled interface that enables electrical connection while preventing direct harmful contact. The layer with contact holes guides conductive balls to precise locations, preventing interference with pad unit edges.
Solution Approach 2:
The insulating layer is formed in advance with predetermined contact holes before the bonding process. This preliminary structuring ensures that conductive balls are directed to exact positions, preventing interference with pad units and ensuring reliable electrical connection before any potential damage can occur.
2Reliability
If the insulating layer is made thicker to provide better insulation and protection, then reliability improves, but manufacturing complexity and precision requirements increase
Solution Approach 1:
The insulating layer is formed with a thickness that is sufficient to provide adequate insulation and protection (excessive action for reliability), while the contact holes are precisely positioned to ensure proper alignment. This approach allows the layer to be thick enough for reliability without requiring extreme manufacturing precision, as the contact holes are strategically placed to accommodate reasonable tolerances.
3Reliability
If contact holes are formed to overlap with pad units for electrical connection, then connectivity is achieved, but misalignment may cause bonding failures
Solution Approach 1:
The insulating layer has different properties in different locations: contact holes are formed only in specific regions where electrical connection is needed (overlapping with pad units), while other regions maintain continuous insulation. This local differentiation enables connectivity where required while maintaining insulation where needed, reducing the impact of positioning tolerances.
4Reliability
If grooves are added between contact holes to receive conductive balls, then connection reliability improves, but device complexity increases
Solution Approach 1:
The insulating layer is segmented into different regions: contact hole regions for electrical connection, groove regions for conductive ball reception and positioning, and continuous insulation regions for protection. This segmentation allows each feature to perform its specific function optimally while working together as an integrated structure.
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 configuration enhances the durability of the organic light emitting display apparatus by ensuring a firm coupling between the substrate and the driving circuit unit, reducing the risk of damage and corrosion, and improving the overall reliability of the display.
Implementation Method 1
an anisotropic conductive film disposed between the insulating layer and the driving circuit unit
Data Source
AI summary
An organic light emitting display apparatus includes a substrate on which a display area and a non-display area are defined, a first electrode on the substrate, an intermediate layer on the first electrode, the intermediate layer includes an organic emission layer, a second electrode on the intermediate layer, a plurality of pad units on the non-display area, and an insulating layer on the pad units. The insulating layer includes contact holes overlapping upper surfaces of the pad units and grooves adjacent to the contact holes.