UV-Curing Display Module Assembly via Transparent Protrusion
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Solution Overview
Problem
Existing display devices face inefficiencies due to the long curing time of structural adhesives, making it difficult to disassemble and rework, which hampers production efficiency and maintenance.
Innovation Solution
A manufacturing method for a display module using a two-color molding middle frame with a colorless transparent protruding portion for UV curing, allowing for rapid glue curing and easy disassembly by irradiating the photo-sensitive glue layer with UV light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If structural adhesive is used to fix the display panel on the backlight module, then the bonding strength is improved, but the curing time is extended and reworkability is reduced
Solution Approach 1:
The patent changes the chemical parameters of the adhesive by using a UV-curing adhesive composition containing photoinitiators and reactive monomers/oligomers instead of conventional structural adhesives. This parameter change enables the adhesive to cure rapidly under UV irradiation, reducing curing time from hours/days to seconds/minutes while maintaining bonding strength
Solution Approach 2:
The patent replaces the thermal curing mechanism (heating) with a photochemical curing mechanism (UV irradiation). The UV light source activates photoinitiators in the adhesive, triggering rapid polymerization without requiring elevated temperatures or extended time, thus substituting a slow thermal process with a fast optical process
2Strength
If structural adhesive is used to fix the display panel on the backlight module, then the bonding strength is improved, but the ease of repair is reduced
Solution Approach 1:
The patent enables reversible bonding through periodic UV irradiation. The adhesive can be cured by UV light for assembly, and the same UV light (or broader spectrum light) can be used again to uncure and separate components for repair. This periodic activation/deactivation cycle facilitates easy reworkability
Solution Approach 2:
The patent replaces permanent mechanical bonding with reversible photochemical bonding. The UV-curing adhesive allows components to be firmly bonded during operation but can be easily separated by UV irradiation during maintenance, substituting irreversible mechanical adhesion with reversible photochemical adhesion
3Productivity
If UV curing light is used to irradiate the light-guiding plate, then the glue curing speed is improved, but the light-guiding plate may be damaged
Solution Approach 1:
The patent applies local quality by making the protruding portion transparent while keeping other parts of the middle frame opaque. This allows UV light to pass through only the specific area where adhesive is located (the protruding portion), curing the adhesive without exposing the entire light-guiding plate to harmful UV radiation
Solution Approach 2:
The patent introduces the transparent protruding portion as an intermediary that selectively transmits UV light. This intermediary structure guides the UV radiation precisely to the adhesive layer while protecting surrounding areas, acting as a mediator between the UV source and the components that need protection
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 method significantly reduces glue curing time, enhancing assembly efficiency and enabling easy separation of components for maintenance, thus improving production efficiency and reworkability.
Implementation Method 1
using an ultraviolet (UV) curing light to irradiate incident surface of the light-guiding plate, with the ultraviolet light transmitted to the first-time dispensing and the second-time dispensing to cure glue at dispensing positions
Data Source
AI summary
The invention provides a manufacturing method of display module, comprising: performing a first-time dispensing on backplate bottom; providing a two-color molding middle frame comprising three connected sidewalls connected forming accommodating space, each sidewall vertically extending into the accommodating space and having a protruding portion; the sidewalls being colored, the protruding portion comprising a colorless transparent portion; placing the middle frame and backlight assembly with reflective sheet and light-guiding plate on backplate with the colorless transparent portion placed on the first-time dispensing glue, and the colorless transparent portion facing the backlight assembly, and the backlight assembly in accommodating space; performing a second-time dispensing on upper surface of colorless transparent portion; placing a display panel on backlight assembly with display panel located on the second-time dispensing; irradiating UV light on incident surface of light-guiding plate, with the UV light transmitted to the first-time and second-time dispensing to cure glue at dispensing positions.