Backlight Module With Integral Reflection Sheets

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Solution Overview

Problem

Conventional backlight modules for liquid crystal displays using cold cathode fluorescent lamps (CCFLs) are environmentally harmful due to mercury content and have cumbersome assembly processes.

Innovation Solution

A backlight module featuring a light guide plate with integral reflection sheets and a supporting member containing light emitting diodes, which forms a U-shaped or L-shaped structure to enhance light utilization and simplify assembly by eliminating the need for separate reflection covers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If cold cathode fluorescent lamps are used as light source, then illumination can be provided, but environmental harm increases due to mercury content

Engineering Contradiction:

ImproveilluminationVSAvoidenvironmental harm

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the light source technology from cold cathode fluorescent lamps to light emitting diodes, transitioning from a harmful mercury-based system to an environmentally friendly LED system while maintaining illumination functionality

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the bulky and environmentally harmful CCFL with more compact LED components that eliminate mercury content, accepting the different operational characteristics of LEDs to achieve greener illumination

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Illumination intensity

If separate reflection covers and multiple components are used, then light reflection can be achieved, but assembly complexity increases

Engineering Contradiction:

Improvelight reflectionVSAvoidassembly complexity

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The patent merges the reflection cover and supporting member into a single integrated component structure, where the reflection sheets are formed integrally with the supporting member, eliminating the need for separate reflection covers and simplifying assembly

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The supporting member serves multiple functions simultaneously: it supports the light emitting diodes, provides the reflection surface through integral reflection sheets, and structures the illumination device, replacing what were previously separate specialized components

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 increases light utilization and simplifies the assembly process by using mercury-free light emitting diodes and integral reflection sheets, reducing environmental impact and assembly complexity.

Implementation Method 1

The illumination device (20) includes a supporting member (242), and plural light emitting diodes (240) formed at the supporting member (242)

Methodology Applied

Scientific EffectLight emitting diode: Light Emitting Diode

Implementation Method 2

The plural reflection sheet (23) is integrally formed with the supporting member (242)... increase the utilization of the light beams

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 3

Light beams in the light guide plate (21) are guided to become a uniform plane light source and emitted out from the light emitting surface 161

Methodology Applied

Scientific EffectTotal internal reflection: Total Internal Reflection

Data Source

PatentUS7445368B2Backlight module and liquid crystal display using same

Publication Date: 2008.11.04 IDUNN IP HOLDINGS LLC

AI summary

An exemplary backlight module (22) includes a light guide plate (21), an illumination device (20), and plural reflection sheets (23). The illumination device is opposite to the light guide plate, and includes a supporting member (242), and plural light emitting diodes (240) formed at the supporting member. The plural reflection sheet is integrally formed with the supporting member.