Backlight Module Reflective Layer Light Extraction

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional backlight modules face issues with high power consumption and heat generation due to the need for high voltage or current to improve light extraction efficiency, which compromises their performance.

Innovation Solution

Incorporating a reflective layer between the substrate and light emitting diodes, with overlapping orthographic projections of the reflective layer and connecting weld legs, enhances light reflection and extraction efficiency without requiring high voltage or current input, thereby reducing power consumption and heat generation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If high voltage or current is applied to improve light extraction efficiency, then brightness is improved, but power consumption and heat generation increase

Engineering Contradiction:

ImprovebrightnessVSAvoidpower consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The patent converts the harmful reflected light that would otherwise be wasted into a beneficial resource by using a reflective layer to redirect it toward the light extraction direction. This allows the system to achieve higher brightness without increasing power input, effectively converting what would be energy waste into useful light output

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the optical parameters of the system by introducing a reflective layer with specific reflectivity characteristics. This modifies the light extraction efficiency parameter, allowing the system to achieve higher brightness output for the same power input, thereby resolving the contradiction between brightness and power consumption

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If high voltage or current is applied to improve light extraction efficiency, then brightness is improved, but heat generation increases

Engineering Contradiction:

ImprovebrightnessVSAvoidheat generation

Core Design Contradiction:

Illumination intensityVSTemperature

Solution Approach 1:

The reflective layer converts what would be wasted reflected light into useful illumination, thereby achieving higher brightness without the need for increased power input that would generate more heat. This converts a potentially harmful loss into a beneficial contribution to light output

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent replaces the electrical approach (increasing voltage/current) with an optical approach (using reflective layer geometry and properties). This substitution allows brightness improvement through optical design rather than electrical input, avoiding the heat generation that would result from increased electrical power

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Illumination intensity

If a reflective layer is added to improve light extraction efficiency, then brightness is improved, but device complexity increases

Engineering Contradiction:

ImprovebrightnessVSAvoidstructure complexity

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The reflective layer serves multiple functions simultaneously: it reflects light to improve extraction efficiency, it can be integrated with existing substrate structures, and it can be applied using standard manufacturing techniques. This multi-functionality allows brightness improvement without proportionally increasing device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The reflective layer is implemented as a thin film structure that can be easily integrated into the existing device architecture. This thin film approach adds minimal structural complexity while achieving the desired optical improvement, as thin films can be deposited using standard manufacturing processes without significantly altering the device form factor

Inventive Principle:

Principle #30Flexible shells and thin films

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 significantly improves light extraction efficiency and brightness while minimizing power consumption and heat production, allowing for a more efficient and cooler operation of the backlight module.

Implementation Method 1

Methodology Applied

Scientific EffectLight reflection: Reflection

Data Source

PatentUS11131797B2Backlight module and display device

Publication Date: 2021.09.28 BOE MLED TECH CO LTD

AI summary

Disclosed are a backlight module and a display device. The backlight module includes: a substrate and light emitting devices disposed on a side of the substrate, where each of the light emitting devices includes a light emitting diode, and a first connecting weld leg and a second connecting weld leg disposed between the light emitting diode and the substrate; the backlight module further includes a reflective layer between the substrate and the light emitting diodes; and for a same light emitting device, an orthographic projection of the reflective layer on the substrate and an area between orthographic projections of the first connecting weld leg and the second connecting weld leg on the substrate have an overlapping area.