Backlight Unit Light Guide Plate Fixing Protrusions

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Solution Overview

Problem

The existing backlight units for liquid crystal display (LCD) devices require separate pads to fix the light guide plate, increasing manufacturing costs and assembly errors due to inaccurate pad placement.

Innovation Solution

A support main with integrally formed fixing protrusions is used to securely attach the light guide plate without separate pads, reducing component count and assembly errors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If separate pads are used to fix the light guide plate, then the light guide plate can be secured, but the number of components increases and manufacturing cost increases

Engineering Contradiction:

Improvelight guide plate fixationVSAvoidnumber of components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The fixing protrusions are integrally formed with the support main as a single molded part, merging the support structure and fixing elements into one component. This eliminates the need for separate pads while maintaining the light guide plate fixation function, thereby reducing component count and manufacturing cost

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If separate pads are used to fix the light guide plate, then the light guide plate can be secured, but manufacturing cost increases

Engineering Contradiction:

Improvelight guide plate fixationVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The fixing protrusions are integrated into the support main as a single molded part, eliminating the need for separate pads and their associated attachment processes. This reduces component count, assembly steps, and overall manufacturing cost while maintaining secure light guide plate fixation

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If separate pads are used to fix the light guide plate, then the light guide plate can be secured, but assembly errors increase due to inaccurate pad placement

Engineering Contradiction:

Improvelight guide plate fixationVSAvoidpad placement accuracy

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The fixing protrusions are integrally formed with the support main, eliminating separate pad components that require manual attachment. This integration ensures precise and consistent positioning of fixing elements, eliminating assembly errors related to inaccurate pad placement by workers

Inventive Principle:

Principle #5Merging (Combining)

4Reliability

If separate pads are used to fix the light guide plate, then the light guide plate can be secured, but assembly time increases due to reattachment requirements

Engineering Contradiction:

Improvelight guide plate fixationVSAvoidassembly time

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The fixing protrusions are integrated into the support main as a single component, eliminating the need for separate pad attachment and potential reattachment operations. This streamlines the assembly process, reducing assembly time and improving productivity while ensuring reliable light guide plate fixation

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS8264634B2Backlight unit and liquid crystal display device having the same

Publication Date: 2012.09.11 LG DISPLAY CO LTD

AI summary

A backlight unit that is designed to fix a light guide plate without using separate pads is provided. The backlight unit includes at least one light source, a light guide plate provided in parallel to the light source, a support main enclosing the light guide plate, and a plurality of fixing protrusions that are formed on an inner edge of the support main to fix the light guide plate.