Display Module Edge Rough Structure for Narrow Bezel Sealing
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Solution Overview
Problem
The narrow bezel design in vehicle-mounted touch control displays leads to a reduction in binding force between the back plate and mold frame, causing wrinkles in film materials and poor sealing performance, resulting in water vapor entry and display failures.
Innovation Solution
A display module with a back plate and mold frame where the edge region features a rough structure region with micro-nano scale grooves, allowing the mold frame material to fill these structures and enhance binding force and sealing, eliminating the need for a glue inlet hole on the back plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the bezel is made narrower to meet large-screen demands, then the display area is increased, but the binding force between the back plate and mold frame deteriorates
Solution Approach 1:
The invention applies a rough structure specifically at the edge region where the back plate contacts the mold frame, creating localized enhanced bonding properties only where needed. This allows the majority of the back plate surface to remain smooth and intact while providing targeted adhesion enhancement at the perimeter, thus maintaining overall structural integrity without requiring a larger bezel area.
Solution Approach 2:
The rough structure is formed on the back plate before the mold frame is assembled and bonded. This preliminary surface treatment creates protrusions and recesses that will later interlock with the bonding material, ensuring strong adhesion is established in advance during the bonding process rather than relying on the limited surface area of a narrow bezel.
2Shape
If the glue inlet hole is made smaller due to narrow bezel design, then the aesthetic appearance is improved, but the binding force between back plate and mold frame deteriorates
Solution Approach 1:
Instead of relying on a larger glue inlet hole for bonding strength, the invention creates localized rough structures at the edge region that provide enhanced bonding properties. This allows the glue inlet hole to remain small for aesthetic purposes while the rough structures distributed along the edge perimeter compensate for the reduced hole size by providing additional bonding surface area and mechanical interlocking.
Solution Approach 2:
The invention transitions from relying on a single-point bonding location (glue inlet hole) to distributed bonding along the edge perimeter. The rough structures create multiple bonding sites around the circumference, effectively moving the bonding function from a one-dimensional hole to a two-dimensional edge region, thereby maintaining bonding strength despite the hole being minimized for aesthetics.
3Area of moving object
If the bezel is narrowed to reduce gaps, then the display area is increased, but water vapor can enter from the junction gap causing sealing performance to deteriorate
Solution Approach 1:
The rough structure is applied specifically at the edge region where sealing is critical, creating a localized barrier that prevents water vapor penetration. The protrusions and recesses in the rough structure form a tortuous path that blocks moisture ingress, while the rest of the back plate maintains its narrow bezel design for maximum display area.
4Shape
If the glue inlet hole diameter is reduced to 0.45-0.6mm for narrow bezel, then the aesthetic appearance is improved, but the binding force and sealing performance deteriorate
Solution Approach 1:
The invention creates rough structures with specific geometric characteristics (protrusions and recesses) at the edge region to provide enhanced bonding and sealing properties. This localized surface modification compensates for the extremely small glue inlet hole diameter (0.45-0.6mm), allowing the hole to remain minimal for aesthetic purposes while the rough structures distributed along the edge provide sufficient bonding strength and sealing performance.
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
The rough structure region increases the binding force between the back plate and mold frame, effectively sealing the gap and preventing water vapor entry, thereby enhancing the display module's sealing performance and reliability.
Implementation Method 1
the rough structure region includes multiple rough structures, an orthographic projection of at least part of the rough structures on the base plate overlaps with an orthographic projection of the mold frame on the base plate, and a material of the mold frame fills at least part of space of the rough structures
Implementation Method 2
a material of the mold frame fills at least part of space of the rough structures
Data Source
AI summary
A display module, a preparing method therefor and a display device are provided. The display module includes a back plate and a mold frame, the back plate includes a base plate, the base plate includes an edge region, the mold frame is disposed on the edge region, the edge region is provided with a rough structure region, the rough structure region includes multiple rough structures, an orthographic projection of at least part of the rough structures on the base plate overlaps with an orthographic projection of the mold frame on the base plate, and a material of the mold frame fills at least part of space of the rough structures.