Backlight Module Light Guide Units Reflective Layers

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Solution Overview

Problem

Conventional local dimming methods for backlight modules struggle to effectively dim the center region and suffer from light interference between different lighting regions, limiting the number of locally dimmed areas and deteriorating the dimming effect.

Innovation Solution

A backlight module design featuring multiple light sources with corresponding light guide units and reflective layers between them, allowing for local dimming of the center region and reducing light interference by using stacked light guide units and reflective surfaces to separate and guide light effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If LED chips are disposed at two opposite sides of a light guide plate for local dimming, then the lighting regions can be adjusted, but the center region cannot be effectively dimmed and light interference between regions occurs

Engineering Contradiction:

Improvelocal dimming controlVSAvoidcenter region dimming effect

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The light guide plate is divided into multiple separate light guide units, each corresponding to a specific lighting region. This segmentation allows independent control of each region, enabling the center region to be effectively dimmed while preventing light interference between adjacent regions through physical separation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Reflective layers are strategically positioned between adjacent light guide units to create localized light reflection and isolation. This local quality enhancement ensures that light from one region does not interfere with adjacent regions, improving the reliability of local dimming control in the center region.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If LED chips are disposed at two opposite sides of a light guide plate for local dimming, then the lighting regions can be adjusted, but light interference between different lighting regions significantly deteriorates the local dimming effect

Engineering Contradiction:

Improvelighting region controlVSAvoidlight interference

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Reflective layers are introduced as intermediary elements between adjacent light guide units. These reflective layers act as mediators that redirect light away from adjacent regions, effectively blocking light interference while maintaining the overall lighting function of the backlight module.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If a reflective layer extends between two light guide units, then light interference is reduced, but the device structure becomes more complex

Engineering Contradiction:

Improvelight isolation effectVSAvoidbacklight module structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The reflective layer is integrated with the light guide units to form a unified structure. By merging the reflective function into the existing light guide unit design, the patent reduces the need for separate components, thereby simplifying the overall device structure while maintaining effective light isolation between regions.

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

Enhances the local dimming effect by allowing independent control of multiple lighting regions and reducing light interference, improving the overall brightness control and energy efficiency.

Implementation Method 1

at least one reflective layer formed between the two adjacent light sources, wherein a portion of the reflective layer extends between two of the light guide units corresponding to the two light sources

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 2

a plurality of light guide units corresponding to the light sources and disposed at one side of the light sources

Methodology Applied

Scientific EffectLight guidance: Waveguide (optics)

Data Source

PatentUS8537100B2Backlight module and display apparatus

Publication Date: 2013.09.17 TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO LTD

AI summary

The present invention provides a backlight module and a display apparatus. The backlight module comprises at least two light sources; a plurality of light guide units corresponding to the light sources and disposed at one side thereof; and at least one reflective layer formed between the two adjacent light sources, wherein a portion of the reflective layer extends between two of the light guide units corresponding to the two light sources. The present invention can enhance the number of the locally dimmed regions and improve the light interference problem between the different lighting regions.