Electro-Optic Device Sealing Structure for Liquid Crystal Leakage Control
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Solution Overview
Problem
Conventional liquid crystal display devices face issues with maintaining product accuracy and display quality due to liquid crystal composition leakage during sealing, which can lead to light-guiding property degradation and unintended light emission or color formation on the substrate periphery.
Innovation Solution
An electro-optic device design featuring a transparent base with a sealing portion that covers the drive circuit and includes an injection port for the liquid crystal composition, positioned to prevent leakage and ensure accurate sealing, along with a conductive film between the drive circuit and liquid crystal composition to prevent electric field formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid crystal composition is sealed by pressure difference and capillary action, then sealing efficiency is improved, but liquid crystal composition may leak outside the sealant
Solution Approach 1:
The patent applies preliminary action by providing a protrusion on the injection port that protrudes into the liquid crystal composition before sealing occurs. This protrusion pre-positioned structure prevents liquid crystal composition from leaking outside the sealant during the pressure difference sealing process, while still allowing efficient sealing through capillary action.
2Reliability
If liquid crystal composition enters between light source and substrate, then sealing is achieved, but light-guiding properties are degraded
Solution Approach 1:
The protrusion structure is provided in advance on the injection port before the liquid crystal composition is injected. This preliminary structural arrangement creates a physical barrier that prevents liquid crystal composition from reaching the space between the light source and substrate, thereby maintaining light-guiding properties while ensuring reliable sealing.
3Reliability
If liquid crystal composition covers drive circuit or wiring line, then sealing is completed, but unintended light emission or color formation occurs
Solution Approach 1:
The protrusion is pre-formed on the injection port structure before liquid crystal composition injection. This preliminary structural feature acts as a containment barrier that directs the liquid crystal composition to remain within the sealant, preventing contact with drive circuits and wiring lines, thereby avoiding unintended light emission or color formation.
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 design maintains product accuracy and improves light-guiding properties while preventing unintended light emission and color formation, ensuring consistent display quality.
Implementation Method 1
the liquid crystal composition is sealed in the inside of the sealant by a pressure difference
Implementation Method 2
the liquid crystal composition is sealed in the inside of the sealant by a pressure difference and capillary action
Data Source
AI summary
According to one embodiment, an electro-optic device includes an electro-optic panel including a transparent base, a sealing portion provided in a peripheral area of the transparent base, a liquid crystal composition sealed by the transparent base and the sealing portion, an injection port for the liquid crystal composition provided in the peripheral area of the transparent base, and a light source arranged opposed to a side surface of the transparent base. The transparent base has a first side and a second side on an opposite side to the first side, the light source is opposed to the first side, and the injection port is opposed to the second side.