Sealed Cap for Liquid Crystal Panel Through Holes
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Solution Overview
Problem
Conventional display devices with liquid crystal panels and rotational shafts are prone to foreign substance entry through holes, leading to potential image unevenness and circuit malfunctions.
Innovation Solution
A display device design featuring a liquid crystal panel with a first through hole and a backlight with a second through hole, both aligned and sealed by a cap with a tube portion and flange portions, preventing foreign substances from entering by forming a continuous, sealed structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If through holes are formed in the liquid crystal panel and backlight for rotational shaft passage, then the rotational shaft can be inserted and the indicator needle can rotate freely, but foreign substances may enter through the through holes causing image unevenness and circuit malfunctions
Solution Approach 1:
The sealing structure is divided into multiple components: a seal member with a seal hole for rotational shaft passage, and a separate cap member that fits into the through hole. This segmentation allows the seal member to maintain the liquid crystal sealing while the cap member blocks foreign substance entry, resolving the contradiction between rotational shaft accessibility and foreign substance prevention.
Solution Approach 2:
The cap member acts as an intermediary element between the through hole and the external environment. It provides a barrier function while allowing the rotational shaft to pass through the seal member's seal hole. The cap member's inner diameter is smaller than the through hole diameter, creating a barrier that prevents foreign substances from entering while maintaining rotational shaft functionality.
2Reliability
If a seal member surrounds the liquid crystal, then the liquid crystal is sealed, but through holes still provide pathways for foreign substance entry
Solution Approach 1:
The sealing system is segmented into two functional parts: the seal member that surrounds and seals the liquid crystal periphery, and the cap member that specifically addresses the through hole vulnerability. This segmentation allows each component to perform its specialized function without interfering with the other, maintaining liquid crystal sealing while blocking foreign substance entry paths.
Solution Approach 2:
Different parts of the display device have different sealing requirements. The seal member provides general peripheral sealing with a larger seal hole for rotational shaft access, while the cap member provides localized sealing at the through hole position with a smaller inner diameter. This local quality differentiation allows the through hole to be sealed against foreign substances while maintaining rotational shaft functionality through the seal member's larger hole.
Data Source
AI summary
A display device for displaying an image on a display surface includes a liquid crystal panel having the display surface, the liquid crystal panel with a first through hole formed in the display surface, a backlight disposed oppositely to the liquid crystal panel, the backlight with a second through hole formed at a position overlapping with the first through hole, and a cap inserted into the first through hole and the second through hole. The cap includes a tube portion with a third through hole formed, the third through hole parallel to the first through hole and the second through hole, and a flange portion formed at least one end of the tube portion, the flange portion having an outer diameter larger than a diameter of the first through hole, and larger than a diameter of the second through hole.