Light Emitting Device Assembly with Inverted Illumination

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Solution Overview

Problem

Conventional phosphor wheels require a larger area for the wavelength conversion device to accommodate the drive device and wavelength conversion layer, making it difficult to use in products that need a small thickness.

Innovation Solution

A light emitting device assembly with a wavelength conversion device, a drive device, and an adapter that allows the excitation light to illuminate the wavelength conversion device from a side facing the drive device, enabling the wavelength conversion device to have a smaller surface area by overlapping axial-direction projections of the drive surface and wavelength conversion layer, thus avoiding blockage by the drive device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If the excitation light illuminates the wavelength conversion device from a side facing away from the drive device, then the light path is clear without blockage, but the area of the wavelength conversion device must be larger than the sum of the drive surface area and wavelength conversion layer area, increasing overall device thickness

Engineering Contradiction:

Improvearea of wavelength conversion deviceVSAvoidthickness of device

Core Design Contradiction:

Area of stationary objectVSLength of stationary object

Solution Approach 1:

The patent inverts the conventional illumination direction by illuminating the wavelength conversion device from the side facing the drive device rather than from the opposite side. This reversal allows the excitation light to pass through the drive device and illuminate the wavelength conversion layer from the front, enabling the wavelength conversion device area to be smaller than the sum of drive surface area and wavelength conversion layer area, thus reducing overall device thickness

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent implements nesting by positioning the wavelength conversion layer within the axial-direction projection of the drive surface, allowing the wavelength conversion device to be nested within the drive device's spatial footprint. The excitation light passes through the drive device to illuminate the wavelength conversion layer, enabling compact integration where the wavelength conversion device area does not need to exceed the drive surface area, thereby reducing overall device thickness

Inventive Principle:

Principle #7Nested doll (Nesting)

2Length of stationary object

If the wavelength conversion device area is reduced to fit thin products, then the device thickness is reduced, but the excitation light may be blocked by the drive device

Engineering Contradiction:

Improvethickness of deviceVSAvoidlight blockage by drive device

Core Design Contradiction:

Length of stationary objectVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent uses the drive device itself as an intermediary through which the excitation light passes to reach the wavelength conversion layer. By designing the illumination system to shine light through the drive device rather than around it, the drive device becomes part of the light path rather than an obstacle, allowing compact integration without light blockage issues

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Enables the use of the light emitting device in products requiring a small thickness while maintaining effective illumination of the wavelength conversion layer, reducing the overall surface area of the wavelength conversion device compared to conventional designs.

Implementation Method 1

a wavelength conversion device, including a wavelength conversion layer having at least one wavelength conversion section, the wavelength conversion section receiving the excitation light and converting it into a converted light

Methodology Applied

Scientific EffectWavelength conversion: Photoluminescence

Data Source

PatentUS9863608B2Light emitting device, light emitting device assembly and relevant projection system

Publication Date: 2018.01.09 APPOTRONICS CORP LTD

AI summary

A light emitting device assembly comprises a wavelength conversion device, a drive device and an adapter. The wavelength conversion device comprises a wavelength conversion layer having at least one wavelength conversion region for receiving an exciting light and converting it into an excited light. The drive device comprises a drive surface used to drive the wavelength conversion device to move, so that a light spot of the exciting light acts on the wavelength conversion device along a preset path. The adapter coaxially connects the drive device and the wavelength conversion device and enables a light ray to arrive at the wavelength conversion device on a side facing the drive device and inside an axial-direction projection of the drive surface on the surface of the wavelength conversion device. The drive surface and the wavelength conversion layer at least partially overlap along the projection surface of the axial projection.