LED Structure with Reflection Layer for View Angle Control

Solution Overview

Problem

Existing display devices with light-emitting diodes require additional lens layers to alter the light-emitting view angle and shape, increasing costs and complexity.

Innovation Solution

A display device design featuring a light-emitting diode structure with a specific relationship between the width of its surfaces and distances, including a reflection layer over the sidewall, allowing for flexible alteration of the light-emitting view angle and shape without the need for an additional lens layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If an additional second lens layer is disposed over the light-emitting surface to alter the light-emitting view angle and shape, then the light-emitting view angle and shape can be altered, but the manufacturing cost greatly increases

Engineering Contradiction:

Improvelight-emitting view angle and shape controlVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent extracts the light-emitting portion from the conventional LED structure and forms an independent light-emitting element with a specific geometric configuration. By taking out the light-emitting function and shaping it directly through the LED's structural parameters (width ratios and distance relationships), the need for additional lens layers is eliminated, thereby reducing manufacturing cost while maintaining view angle and shape control capability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent transitions from controlling light properties through additional optical layers (adding depth/dimensions) to controlling light properties through the geometric dimensions and spatial relationships within the LED structure itself. By establishing specific mathematical relationships between width parameters and distances in the LED's cross-sectional view, the invention achieves view angle and shape control through dimensional parameters rather than additional optical components

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If an additional second lens layer is disposed over the light-emitting surface to alter the light-emitting view angle and shape, then the light-emitting view angle and shape can be altered, but the device structure becomes more complex

Engineering Contradiction:

Improvelight-emitting view angle and shape controlVSAvoiddevice structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent extracts the light-emitting portion from the conventional LED structure and forms an independent light-emitting element with a specific geometric configuration. By taking out the light-emitting function and shaping it directly through the LED's structural parameters (width ratios and distance relationships), the need for additional lens layers is eliminated, thereby reducing manufacturing cost while maintaining view angle and shape control capability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent makes the LED's structural parameters serve multiple functions: the width ratios and distance relationships simultaneously determine both the light-emitting view angle and the light-emitting shape. This multi-functionality eliminates the need for separate optical components, simplifying the overall device structure while achieving versatile light control

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 cost-effective and flexible control over light-emitting view angle and shape, improving light-emitting effectiveness without the requirement for additional lens layers.

Implementation Method 1

a reflection layer disposed over a side of the bulk portion

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 2

The recombination radiation of electron and hole in the light-emitting diode may produce electromagnetic radiation (such as light) through the current at the p-n junction

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS9837582B1Display device

Publication Date: 2017.12.05 INNOLUX CORP

AI summary

A display device is provided. The display device includes a substrate and a light-emitting diode. The light-emitting diode includes first and second conductive-type semiconductor layers and a light-emitting layer. The second conductive-type semiconductor layer is adjacent to the substrate. The first conductive-type semiconductor layer includes a bulk portion and a reflection layer disposed over a side of the bulk portion. The bulk portion has a first surface away from the light-emitting layer and a second surface adjacent to the light-emitting layer. The second conductive-type semiconductor layer has a third surface adjacent to the light-emitting layer and a fourth surface away from the light-emitting layer. There is a specific relationship between the width of the first surface, the width of the light-emitting layer, the distance from the first surface to the fourth surface, and the distance from the first surface to the light-emitting layer.