LED Light Emitting Device With Lattice-Shaped Light Shielding

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Solution Overview

Problem

Densely arranging LEDs and fluorescent portions in light emitting devices can lead to mounting errors and uneven distribution, making it difficult to control lighting appearance due to variations in the number of fluorescent portions emitting light or not emitting light in response to the turning-on and turning-off pattern of LEDs.

Innovation Solution

A light emitting device with a lattice-shaped light-shielding portion between fluorescent portions and LEDs, ensuring a consistent overlap of four fluorescent portions per LED, maintaining a uniform light-emitting area and precise control of lighting appearance despite potential mounting errors or size irregularities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If LEDs and fluorescent portions are densely arranged to improve light emission intensity and control precision, then productivity and illumination intensity are improved, but mounting precision deteriorates due to mounting errors affecting positional relationships

Engineering Contradiction:

Improvelight emission intensityVSAvoidpositional relationship between LEDs and fluorescent portions

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The wavelength converting member is segmented into a plurality of fluorescent portions arranged in rows and columns, with each fluorescent portion corresponding to specific LEDs. This segmentation allows independent control and maintains positional relationships even with mounting variations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Light-shielding portions are strategically placed at specific locations between fluorescent portions to control light emission locally. This ensures that even with mounting errors, only the intended fluorescent portions receive light from each LED, maintaining control precision.

Inventive Principle:

Principle #3Local quality

2Illumination intensity

If fluorescent portions are densely arranged to improve illumination intensity, then area of stationary object is improved, but reliability deteriorates due to uneven distribution of fluorescent portions above LEDs

Engineering Contradiction:

Improvelight emission intensityVSAvoidcontrol of lighting appearance

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

Light-shielding portions act as intermediaries between LEDs and fluorescent portions, controlling which fluorescent portions receive light from each LED. This ensures uniform light emission control across all LEDs, improving reliability of lighting appearance control.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The light-shielding portions are pre-positioned in the wavelength converting member to predetermined positions before mounting. This preliminary arrangement ensures that even with mounting variations, the light-shielding portions will be at correct locations to control light emission uniformly.

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If fluorescent portions are made uniform in size to simplify manufacturing, then ease of manufacture is improved, but manufacturing precision deteriorates due to difficulty in forming consistently sized fluorescent portions

Engineering Contradiction:

Improveformation of fluorescent portionsVSAvoidsize uniformity of fluorescent portions

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The light-shielding portions are designed to compensate for variations in fluorescent portion sizes. By positioning light-shielding portions at specific distances from fluorescent portions, the system tolerates size variations without affecting light emission control, cushioning against manufacturing imprecision.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

4Measurement precision

If light-shielding portions are added to control light emission, then control precision is improved, but device complexity increases due to additional components

Engineering Contradiction:

Improvecontrol of lighting appearanceVSAvoidstructure of wavelength converting member

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The light-shielding portions are integrated into the wavelength converting member as a unified structure with the fluorescent portions, rather than being separate components. This merging reduces assembly steps and overall device complexity while maintaining control precision.

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 solution achieves high luminance and precise control of lighting appearance by ensuring a consistent number of fluorescent portions emit light when LEDs are turned on and off, reducing variance and maintaining a uniform light-emitting area.

Implementation Method 1

a wavelength converting member that includes a plurality of fluorescent portions arranged in rows and columns above the plurality of LEDs

Methodology Applied

Scientific EffectFluorescence: Fluorescence

Data Source

PatentUS10746356B2Light emitting device

Publication Date: 2020.08.18 NICHIA CORP

AI summary

A light emitting device includes: a plurality of LEDs arranged in rows and columns; and a wavelength converting member above the plurality of LEDs, the wavelength converting member comprising: a plurality of fluorescent portions arranged in rows and columns, and a light shielding portion between the plurality of fluorescent portions; wherein, in a top view, a first fluorescent portion among the plurality of fluorescent portions overlaps first and second adjacent LEDs among the plurality of LEDs.