Polysiloxane Insulating Layer Water Ingress Prevention
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Solution Overview
Problem
Display devices, such as liquid crystal and organic light emitting displays, face reliability issues due to water ingress through the sealing portion, leading to display unevenness and potential corrosion, especially in high humidity and temperature conditions.
Innovation Solution
The use of polysiloxane-based insulating layers on both substrates, which extend beyond the sealing portion, provides strong coupling and prevents water entry, enhancing the reliability of the display device by functioning as both an alignment film and an insulating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealant is used to seal the display layer between two substrates, then the display layer is sealed, but water can still enter the display layer through the sealant, causing display unevenness
Solution Approach 1:
The patent uses an insulating layer made of polysiloxane that extends from the display region to the peripheral region, covering the sealing portion. This thin film structure provides continuous protection against water ingress, supplementing the sealant-based sealing and preventing water from reaching the display layer through the sealant interface.
Solution Approach 2:
The patent combines multiple materials with different properties: the sealant provides initial sealing, while the polysiloxane-based insulating layer provides additional water barrier protection. This composite approach creates a multi-layer defense system where each material contributes its strengths to achieve comprehensive water prevention.
2Reliability
If the insulating layer is positioned only in the display region, then the display electrode is covered, but the terminal portion is exposed and vulnerable to water damage
Solution Approach 1:
The insulating layer serves multiple functions simultaneously: it provides electrical insulation for the display electrode in the display region, extends protection to the terminal portion in the peripheral region, and covers the sealing portion to prevent water ingress. This multi-functional design eliminates the need for separate protective structures for each component.
Solution Approach 2:
The insulating layer extends from the display region into the peripheral region along the planar dimension, creating a continuous protective barrier that spans both functional areas. This dimensional extension ensures that the terminal portion and sealing portion are included in the protection zone without adding vertical complexity.
Data Source
AI summary
According to one embodiment, a display device includes a first substrate unit, a second substrate unit, a display layer, and a sealing portion. The first substrate unit includes a first substrate, a display electrode, a terminal portion, and a first insulating layer. The first substrate has a first major surface. The first major surface has a display region and a peripheral region. The display electrode is provided in the display region. The terminal portion is provided in the peripheral region and electrically connected to the display electrode. The first insulating layer is provided on the display and peripheral regions. The second substrate unit faces the first major surface. The display layer is provided between the display electrode and the second substrate unit. The sealing portion is provided between the first and second substrate units. The sealing portion surrounds the display layer and contacts the first insulating layer.