Electro-Optical Device Resin Sealing with Uneven Flattening Edge
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Solution Overview
Problem
The existing methods for sealing electro-optical elements using a resin layer are prone to wet-spreading, leading to insufficient coverage of foreign matters, which can result in moisture infiltration and reduced reliability of the device due to the resin not reaching the frame-shaped banks during the ink-jet application process.
Innovation Solution
An electro-optical device with a circuit substrate featuring a flattening layer, electro-optical elements, and a sealing film with a resin layer, where the flattening layer has an uneven peripheral edge to facilitate the resin flow and ensure it reaches the frame-shaped banks, thereby covering any foreign matters effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the resin is applied by ink-jet method on a flat flattening layer, then the resin application is simple and quick, but the resin stops on the flattening layer due to surface tension and does not reach the frame-shaped banks
Solution Approach 1:
The patent introduces a resin guide groove structure on the flattening layer before resin application. This groove structure preliminarily guides the resin flow path, ensuring that the resin applied by ink-jet method will naturally flow along the groove toward the frame-shaped banks, preventing the resin from stopping on the flattening layer surface
Solution Approach 2:
The resin guide groove acts as an intermediary structure between the resin droplet and the frame-shaped bank. It provides a designated pathway that mediates the resin's movement from the application point to the target area, overcoming the surface tension barrier that would otherwise prevent the resin from reaching the banks
2Object-affected harmful factors
If the resin layer is formed to seal the electro-optical elements, then moisture and oxygen infiltration is prevented, but foreign matters cannot be covered and levelled when the resin does not reach the frame-shaped banks
Solution Approach 1:
The resin guide groove serves as an intermediary pathway that ensures the resin layer continuously covers from the electro-optical elements to the frame-shaped banks. This continuous coverage eliminates gaps where foreign matters could be trapped, while still maintaining the sealing function against moisture and oxygen
Solution Approach 2:
The groove structure preliminarily defines the resin coverage area before the resin is applied. This ensures that when the resin flows, it will automatically cover the transition region between the electro-optical elements and the frame-shaped banks, preventing foreign matter accumulation in advance
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
The uneven edge structure on the flattening layer directs the resin to flow and cover the frame-shaped banks, preventing moisture infiltration and enhancing the reliability of the electro-optical device by ensuring comprehensive coverage.
Implementation Method 1
due to the surface tension, a flow movement of the resin is easily stopped on an upper face of a flattening layer
Data Source
AI summary
An electro-optical device includes a circuit substrate including a flattening layer provided on a surface of the circuit substrate, at least one electro-optical element provided on the flattening layer, a sealing film configured to seal the electro-optical element and including at least a resin layer, and a frame-shaped bank surrounding the flattening layer and covered by the resin layer on an inner side of the frame-shaped bank. In a plan view, an unevenness is provided at a peripheral edge of the flattening layer facing the frame-shaped bank.