Middle Frame Injection Molding for Display Screens

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The existing methods for manufacturing middle frames for display screens are inefficient, with complex adhesive dispensing processes, long curing times, and difficulty in achieving a narrow frame design due to the use of adhesives or foam adhesives, which result in defects like warping and increased frame width.

Innovation Solution

A manufacturing method involving injection molding, where a glass cover plate is fixed to a mold, and a cavity is formed by bonding another mold to create a middle frame peripherally, allowing for the injection and cooling of molten material to form a middle frame directly on the glass cover plate, reducing assembly complexity and enabling a narrower frame design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If adhesive dispensing or foam adhesive connection is used to bond the middle frame with the glass cover plate, then bonding is achieved, but the assembly process becomes complex and the frame width increases

Engineering Contradiction:

Improvebonding strengthVSAvoidassembly process complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent merges the middle frame and glass cover plate into a single integrated structure through injection molding. The molten material is injected to form the middle frame that directly bonds with the glass cover plate, eliminating the need for separate adhesive dispensing and assembly steps. This combining of components resolves the technical contradiction by achieving bonding strength through the molded joint itself rather than through additional adhesive processes.

Inventive Principle:

Principle #5Merging (Combining)

2Strength

If adhesive dispensing or foam adhesive connection is used to bond the middle frame with the glass cover plate, then bonding is achieved, but the curing period becomes long and productivity decreases

Engineering Contradiction:

Improvebonding strengthVSAvoidassembly efficiency

Core Design Contradiction:

StrengthVSProductivity

Solution Approach 1:

The patent combines the bonding function with the structural function of the middle frame itself. By injecting molten material that forms both the structural frame and the bonding interface with the glass cover plate in one process, the need for separate curing steps is eliminated. This integration resolves the contradiction by achieving bonding strength without the time penalty of adhesive curing.

Inventive Principle:

Principle #5Merging (Combining)

3Ease of manufacture

If adhesive or foam adhesive is used for bonding, then the middle frame can be assembled, but the frame width increases and narrow frame design becomes difficult

Engineering Contradiction:

Improveassembly feasibilityVSAvoidframe width

Core Design Contradiction:

Ease of manufactureVSLength of stationary object

Solution Approach 1:

The patent merges the bonding interface into the structural design of the middle frame itself. The molten material is injected to form a bonding joint that is integral to the frame structure, eliminating the need for separate adhesive layers that would increase frame width. This integration allows the frame to maintain its structural integrity while achieving narrow frame dimensions.

Inventive Principle:

Principle #5Merging (Combining)

4Ease of manufacture

If adhesive dispensing is used to bond the middle frame with the glass cover plate, then assembly is achieved, but defects like warping and adhesive overflow occur

Engineering Contradiction:

Improveassembly feasibilityVSAvoidassembly quality

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent extracts the bonding function from the adhesive material and transfers it to the molded structure itself. By removing the adhesive dispensing process entirely and using injection-molded material to create the bonding interface, the source of defects like warping and adhesive overflow is eliminated. This extraction of the bonding function from adhesive to structure resolves the quality issues.

Inventive Principle:

Principle #2Taking out (Extraction)

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 simplifies the assembly process, enhances bonding strength, and achieves a narrower frame design by eliminating adhesive-related defects, improving the competitiveness of mobile phone products with a more efficient and consistent manufacturing process.

Implementation Method 1

cooling the molten material to form the middle frame

Methodology Applied

Scientific EffectCooling: Cooling

Implementation Method 2

cooling the molten material to form the middle frame

Methodology Applied

Scientific EffectPhase change: Phase Change

Data Source

PatentUS10421118B2Manufacturing method of middle frame for display screen, display screen and display device

Publication Date: 2019.09.24 BOE TECHNOLOGY GROUP CO LTD

AI summary

A manufacturing method of a middle frame for a display screen, a display screen and a display device is provided. The method includes: fixing a glass cover plate of the display screen to a first mold; bonding a second mold with the first mold, so as to form a cavity for forming the middle frame on a periphery of the glass cover plate; injecting a molten material into the cavity; cooling the molten material to form the middle frame, wherein the middle frame is integrally injected and molded on the periphery of the glass cover plate.