Display Device Guide Mold Adhesion via Segmented Bonding Member
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Solution Overview
Problem
As display devices become thinner, the reduced space for attaching the guide mold to the cover glass leads to weaker adhesive forces, causing the guide mold to detach and allowing foreign matter to enter, thereby reducing the reliability of the device.
Innovation Solution
The use of screws to securely couple the guide mold with the cover glass and a filling member to tightly attach the flexible printed circuit board (FPCB) to the bonding member, preventing foreign matter from entering through gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the display device is made thinner, then the design is improved and size is reduced, but the adhesion space for coupling the guide mold to the cover glass is reduced, causing weaker adhesive force and potential detachment
Solution Approach 1:
The bonding member is divided into multiple non-recessed portions and recessed portions along its length. The non-recessed portions provide attachment areas for the guide mold, while the recessed portions create spacing. This segmentation allows the guide mold to be securely coupled at multiple discrete points, distributing the adhesion load and preventing detachment even when overall adhesion space is limited in thin devices.
Solution Approach 2:
A bonding member is introduced as an intermediary component between the guide mold and the cover glass. This bonding member features a specific structure with alternating non-recessed and recessed portions, acting as a mediator that provides secure attachment points for the guide mold while maintaining the thin profile of the display device. The bonding member transfers and distributes mechanical forces, enhancing the reliability of the connection.
2Device complexity
If the guide mold detaches from the cover glass due to reduced adhesion space, then device assembly is simplified, but foreign matter can be introduced through the gap, reducing reliability
Solution Approach 1:
The bonding member with its pre-structured non-recessed and recessed portions is prepared in advance before assembly. This preliminary structuring ensures that when the guide mold is attached, it forms secure connections at multiple predetermined locations, preventing gap formation and foreign matter intrusion during and after assembly. The structure is designed beforehand to eliminate potential entry points for contaminants.
3Ease of manufacture
If the FPCB is not tightly attached to the bonding member, then assembly is easier, but spacing is created that allows foreign matter to permeate into the device
Solution Approach 1:
The bonding member exhibits local quality variations through its alternating non-recessed and recessed portions. The non-recessed portions provide localized areas for tight attachment of the FPCB and guide mold, ensuring no spacing or gaps are created at these critical locations. The recessed portions provide spacing in areas where foreign matter intrusion would not occur. This local differentiation of attachment and spacing zones prevents foreign matter permeation while maintaining ease of assembly.
Data Source
AI summary
A display device includes a display panel, a cover, a bonding member, a guide mold and at least one fastening member. The cover is above the display panel. The bonding member is on a surface of the cover and includes a plurality of non-recessed portions and a plurality of recessed portions between the plurality of non-recessed portions. The guide mold accommodates a light source below the display panel and includes a plurality of protruding portions protruding from a side surface thereof, each of the plurality of protruding portions respectively corresponding to each of the plurality of non-recessed portions. The at least one fastening member penetrates a corresponding one of the plurality of protruding portions of the guide mold to be fastened to a corresponding one of the plurality of recessed portions.