Backlight Module Bezel Assembly Particle Ingress Prevention

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Solution Overview

Problem

Conventional backlight modules suffer from particle ingress through gaps between the light guide plate and bezels, leading to potential failure or malfunction due to uneven extrusion during metal bezel manufacturing.

Innovation Solution

A bezel assembly is designed with a metal bezel featuring a side wall that covers the hole structure on a plastic bezel, and additional hole structures on opposite sides of the metal bezel to prevent particle entry and avoid uneven extrusion during metal forming, ensuring complete coverage and structural integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a hole structure is formed on the plastic bezel to prevent corner cracking, then the light guide plate corner is protected from cracking, but particles can enter the backlight module through the gap between the light guide plate corner and the plastic bezel

Engineering Contradiction:

Improvecorner strength of light guide plateVSAvoidparticle contamination resistance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The metal bezel acts as an intermediary component that covers the hole structure on the plastic bezel. The metal bezel's side wall is positioned to cover the hole structure, preventing particles from entering through the gap while the hole structure continues to protect the light guide plate corner from cracking.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If a hole structure is formed on the metal bezel corner to prevent uneven extrusion during metal forming, then the metal bezel manufacturing is improved, but the hole structure allows particles to enter the backlight module

Engineering Contradiction:

Improvemetal bezel forming processVSAvoidparticle contamination resistance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The bezel system is segmented into two separate components: the plastic bezel with the hole structure for manufacturing relief, and the metal bezel that covers this hole structure. This segmentation allows each component to have its own hole structures optimized for its specific function while the metal bezel prevents particle ingress.

Inventive Principle:

Principle #1Segmentation

3Reliability

If the metal bezel is designed to cover the plastic bezel's hole structure, then particle ingress is prevented, but the manufacturing complexity of the bezel assembly increases

Engineering Contradiction:

Improveparticle contamination resistanceVSAvoidbezel assembly structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The plastic bezel is nested within the metal bezel assembly. The metal bezel serves as an outer protective structure that covers the hole structure on the inner plastic bezel, creating a nested configuration where the outer component protects the inner component's vulnerable areas.

Inventive Principle:

Principle #7Nested doll (Nesting)

Data Source

PatentUS8267567B2Backlight module, bezel assembly applied to backlight module, and display device

Publication Date: 2012.09.18 AU OPTRONICS CORP

AI summary

A bezel assembly, which is applied to a backlight module, includes a first bezel and a second bezel. The first bezel has a first side wall and a second side wall. A first hole structure is formed on a corner between the first and second side walls. The second bezel has a third side wall. A second hole structure and a third hole structure are formed on opposite sides of the third side wall. When the first bezel is disposed in the second bezel, the third side wall can completely cover the first hole structure of the first bezel from the outside of the first bezel, and the second and third hole structures are close to the first hole structure.