Liquid Crystal Display Contact Hole Moisture Protection
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Solution Overview
Problem
In high-definition and high-functionality liquid crystal display devices, the increasing number of signal lines makes it difficult to provide contact holes within the seal member region, leading to potential corrosion of conductive films due to moisture exposure when contact holes are placed outside the seal member.
Innovation Solution
A liquid crystal display device configuration with conductive films in different layers, where a contact hole is formed in a region outside the seal member, and a moisture-proof insulating film covers the contact hole to prevent exposure to moisture, allowing for increased design freedom and protection of the conductive films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If contact holes are provided in the outer region outside the seal member to accommodate increasing signal lines, then the space for arranging signal lines is increased and design freedom is improved, but the conductive film becomes susceptible to moisture and may be corroded
Solution Approach 1:
The patent introduces a moisture-proof insulating film as an intermediary protective layer between the conductive film and the external environment. This insulating film specifically covers the contact hole regions in the outer region, acting as a barrier that prevents moisture from reaching and corroding the conductive film, thereby resolving the contradiction between needing external contact holes for signal line arrangement and protecting against moisture corrosion
2Reliability
If contact holes are provided inside the seal member region, then the conductive film is protected from moisture, but it becomes difficult to provide contact holes as the number of signal lines increases
Solution Approach 1:
The patent divides the substrate into different regions (inner region inside the seal member and outer region outside the seal member) and applies different protection strategies to each. The moisture-proof insulating film is selectively applied to cover contact holes in the outer region, while the inner region maintains its traditional sealed protection. This segmentation allows contact holes to be provided in the outer region without compromising moisture protection
Data Source
AI summary
A liquid crystal display device includes substrates, a liquid crystal layer between the substrates, a seal member between the substrates and surrounding the liquid crystal layer, an electrode in a first region of one of the substrates, the first region overlapping a region surrounded by the seal member, a first conductive film in a second region of the one substrate, the second region being a region outside the seal member, a second conductive film in the one substrate and extending from the electrode toward the first conductive film, a first insulating film disposed between the first and second conductive films, including a contact hole in a portion of the second region overlapping the first conductive film, and the first conductive film and the second conductive film being electrically connected to each other through the contact hole, and a second insulating film that covers the contact hole and is moisture-proof.