Reflective Cover for Backlight Light Leakage Control

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Solution Overview

Problem

Conventional backlight modules experience significant light leakage and reduced light utilization efficiency due to the inability to effectively redirect light emitted from light emitting elements to the light guide plate, leading to inefficient display performance in liquid crystal displays.

Innovation Solution

A backlight structure comprising a light guide plate, a light source module, and a reflective cover with a first and second reflecting portion, where the reflective cover is strategically positioned between the light source module and the light guide plate to reflect light emitted from the light emitting elements back onto the light guide plate, enhancing light utilization efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If a reflector is disposed on the bottom of the light guide plate to reflect light leaking from the bottom surface, then light utilization efficiency is improved, but light leakage from the light incident side cannot be prevented

Engineering Contradiction:

Improvelight utilization efficiencyVSAvoidlight leakage from light incident side

Core Design Contradiction:

Loss of energyVSObject-generated harmful factors

Solution Approach 1:

The reflective cover is divided into two functional portions: a first reflecting portion that reflects light from the light incident side, and a second reflecting portion that reflects light from the bottom surface. This segmentation allows each portion to address specific light leakage paths independently, resolving the contradiction between preventing light incident side leakage and maintaining bottom surface reflection efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The reflective cover extends in multiple spatial dimensions with the first reflecting portion positioned to address light leakage from the light incident side and the second reflecting portion positioned to address light leakage from the bottom surface. This multi-dimensional configuration enables comprehensive light control that simultaneously addresses leakage from different surfaces without compromising the light guiding function.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Loss of energy

If the reflective cover is added to prevent light leakage from the light incident side, then light utilization efficiency is enhanced, but device complexity increases

Engineering Contradiction:

Improvelight leakage reductionVSAvoidbacklight module structure

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The reflective cover serves multiple functions simultaneously: the first reflecting portion prevents light leakage from the light incident side, the second reflecting portion reflects light from the bottom surface, and the overall structure maintains the light guiding function. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while achieving comprehensive light leakage prevention.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The first reflecting portion and second reflecting portion are merged into a single reflective cover component that integrates multiple reflection functions. This merging approach consolidates what would otherwise require multiple separate components, reducing assembly complexity and structural complexity while maintaining the ability to address light leakage from different surfaces.

Inventive Principle:

Principle #5Merging (Combining)

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 proposed solution significantly reduces light leakage and enhances light utilization efficiency by effectively redirecting emitted light onto the light guide plate, improving the overall display performance of liquid crystal displays.

Implementation Method 1

The reflective cover has a first reflecting portion and a second reflecting portion, wherein the first reflecting portion is disposed between a surface of the substrate and the light incident side of the light guide plate, the second reflecting portion extends from the first reflecting portion and covers a part of the light-exiting surface, so that the reflective cover reflects light emitted from the light emitting element to the light guide plate.

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentUS8727595B2Backlight structure with reflective light source cover and manufacturing method

Publication Date: 2014.05.20 AU OPTRONICS CORP

AI summary

A backlight structure includes a light guide plate, at least one light source module, and a reflective cover. The light guide plate has a light incident side and a light-exiting surface, wherein the light-exiting surface is formed at an edge of the light incident side. The light source module includes a substrate and at least one light emitting element, wherein the light emitting element disposed on the substrate emits light to the light incident side. The reflective cover has a first reflecting portion and a second reflecting portion, wherein the second reflecting portion extends from the first reflecting portion disposed between a surface of the substrate and the light incident side of the light guide plate and covers a part of the light-exiting surface, so that the reflective cover reflects light emitted from the light emitting element to the light guide plate.