Backlight Assembly Mold Frame Protrusions for Luminance

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Solution Overview

Problem

Conventional backlight assemblies for liquid crystal displays (LCDs) face issues with light loss and reduced luminance due to gaps between the light source and the light guide plate, leading to defects such as separation of components.

Innovation Solution

A backlight assembly with a mold frame featuring protrusions that facilitate a close attachment between the light source and the light guide plate, utilizing a tetrahedral or pentagonal shaped protrusion to create a wedge effect, ensuring proper alignment and contact, thereby minimizing gaps and enhancing luminance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If conventional backlight assemblies are used without protrusions, then the structure is simpler, but gaps form between the light source and light guide plate causing light loss and reduced luminance

Engineering Contradiction:

ImproveluminanceVSAvoidmold frame structure

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The mold frame is segmented with protrusions that divide the attachment opening into multiple regions, creating localized contact points between the light source and light guide plate. This segmentation ensures proper positioning and eliminates gaps without requiring complex additional components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The protrusions act as intermediary elements between the light source and light guide plate, facilitating close attachment and light transmission. These protrusions mediate the interface between components to prevent light loss while maintaining structural simplicity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If additional adhesives are used to fix the light source, then attachment is improved, but manufacturing cost increases and assembly complexity increases

Engineering Contradiction:

Improveattachment stabilityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The mold frame with protrusions provides self-aligning and self-fixing functionality. The protrusions automatically position and secure the light source against the light guide plate through geometric constraints, eliminating the need for external adhesives or additional fastening mechanisms.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The mechanical adhesive bonding system is replaced with a geometric mechanical constraint system using protrusions. This substitution provides reliable attachment through physical interference fit and geometric locking, eliminating the need for chemical adhesives.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If gaps exist between light source and light guide plate, then assembly is easier, but light diffusion efficiency decreases and defects occur

Engineering Contradiction:

Improvelight diffusion efficiencyVSAvoidattachment structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The mold frame features localized protrusions at specific positions where light source attachment is required. These local structural modifications provide precise control over the light source positioning and ensure optimal light diffusion efficiency without requiring complex overall structural changes.

Inventive Principle:

Principle #3Local quality

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 solution improves luminance by ensuring efficient light diffusion and reduces defects by firmly fixing the light source, eliminating the need for additional adhesives and potentially reducing manufacturing costs.

Implementation Method 1

Methodology Applied

Scientific EffectWedge effect: Wedge

Implementation Method 2

a light guide plate configured to receive and diffuse light emitted from the light source

Methodology Applied

Scientific EffectLight diffusion: Scattering

Data Source

PatentUS8872999B2Backlight assembly and liquid crystal display including the same

Publication Date: 2014.10.28 SAMSUNG DISPLAY CO LTD

AI summary

A backlight assembly includes a light source, a light guide plate configured to receive and diffuse light emitted from the light source, and a mold frame including a central opening part configured to receive the light guide plate, an attachment opening part adjacent to the central opening part, the attachment opening part being configured to receive the light source, and a protrusion in the attachment opening part, the protrusion contacting the light source in the attachment opening.