Light Emitting Cell Layout for Uniform Pixel Emission

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Solution Overview

Problem

Existing light emitting elements face challenges in achieving a desired emission intensity distribution, particularly in display devices where individual pixel driving is difficult to control effectively.

Innovation Solution

A light emitting element design featuring a first semiconductor layer with a central light emitting cell and surrounding cells, a continuous insulation layer, and individually positioned electrodes, which includes a dielectric multilayer film to improve light extraction efficiency and reduce light propagation between cells, thereby achieving a uniform emission intensity distribution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If individual pixel driving is implemented in display devices, then pixel-level control is achieved, but desired emission intensity distribution becomes difficult to achieve

Engineering Contradiction:

Improvepixel control capabilityVSAvoidemission intensity distribution

Core Design Contradiction:

Ease of operationVSIllumination intensity

Solution Approach 1:

The patent applies local quality by providing different insulation layer configurations to different light emitting cells. Specifically, the first light emitting cell has a first insulation layer with a first opening, while the second light emitting cell has a second insulation layer with a second opening. This allows each cell to have tailored electrical connection characteristics, enabling precise control of emission intensity distribution across the display device while maintaining individual pixel driving capability.

Inventive Principle:

Principle #3Local quality

2Area of stationary object

If light emitting cells are arranged in array, then coverage area is increased, but light propagation between cells causes interference

Engineering Contradiction:

Improvedisplay areaVSAvoidlight propagation interference

Core Design Contradiction:

Area of stationary objectVSObject-generated harmful factors

Solution Approach 1:

The patent applies segmentation by dividing the light emitting element into multiple independent light emitting cells (first light emitting cell and second light emitting cell), each with its own insulation layer and electrode configuration. The insulation layers act as segmentation barriers that electrically isolate and optically separate adjacent cells, preventing light propagation interference while allowing the array to cover a larger display area.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses insulation layers as intermediary structures between adjacent light emitting cells. These insulation layers with openings serve as mediators that control electrical connections while blocking unwanted light propagation between cells, thus eliminating interference while maintaining the benefits of array arrangement.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If uniform electrode configuration is used across all light emitting cells, then manufacturing complexity is reduced, but emission intensity distribution becomes non-uniform

Engineering Contradiction:

Improveelectrode configuration simplicityVSAvoidemission intensity uniformity

Core Design Contradiction:

Ease of manufactureVSIllumination intensity

Solution Approach 1:

The patent implements local quality by configuring different insulation layers and electrode arrangements for different light emitting cells. The first light emitting cell has a first insulation layer with a first opening, while the second light emitting cell has a second insulation layer with a second opening. This localized differentiation enables uniform emission intensity distribution across the display device, overcoming the limitations of uniform electrode configurations.

Inventive Principle:

Principle #3Local quality

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 design enhances light extraction efficiency and contrast ratio by controlling emission intensity uniformly across the light emitting cells, improving the overall performance of the light emitting element.

Implementation Method 1

a dielectric multilayer film to improve light extraction efficiency

Methodology Applied

Scientific EffectLight extraction:

Implementation Method 2

reduce light propagation between cells

Methodology Applied

Scientific EffectLight propagation control:

Data Source

PatentUS20240213298A1Light emitting element

Publication Date: 2024.06.27 NICHIA CORP

AI summary

A light emitting element includes: a first semiconductor layer; light emitting cells disposed on the first semiconductor layer, each including: an active layer, and a second semiconductor layer disposed on the active layer, wherein the light emitting cells include a first light emitting cell positioned in a center, and a plurality of second light emitting cells positioned around the first light emitting cell; a first insulation layer having a first opening provided above the first semiconductor layer located outward from the second light emitting cells and a plurality of second openings located above each second semiconductor layer; a first electrode disposed on the first insulation layer and electrically connected to the first semiconductor layer at the first opening; and a plurality of second electrodes, each positioned on and electrically connected to a respective one of the second semiconductor layers at a respective one of the second openings.