Light-Emitting Device With Optical Filters For Sharp Spectrum And Translucency

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Solution Overview

Problem

Light-emitting devices with optical transparency face a challenge in achieving a sharp emission spectrum peak without compromising translucency when an optical filter is applied.

Innovation Solution

A light-emitting device configuration featuring a light-transmitting substrate with separate light-emitting units, each comprising a light-transmitting first electrode, a light-reflective second electrode, and an organic layer, along with a light-transmitting region between units, where an optical filter is applied only to the light-emitting units and not the transmitting regions, maintaining translucency while achieving a sharp emission spectrum.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If an optical filter is provided in the light-transmitting light-emitting device, then the emission spectrum peak becomes sharp, but the translucency of the device decreases

Engineering Contradiction:

Improveemission spectrum peak sharpnessVSAvoidtranslucency

Core Design Contradiction:

Measurement precisionVSIllumination intensity

Solution Approach 1:

The device is divided into light-emitting units and light-transmitting regions. The optical filter is applied only to the light-emitting units, while the light-transmitting regions remain unfiltered, allowing them to maintain high translucency. This segmentation enables simultaneous achievement of sharp emission spectrum peaks in the emitting areas and high translucency in the transmitting areas.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the device are assigned different optical properties: the light-emitting units have optical filters for sharp spectrum peaks, while the light-transmitting regions have no filters for maximum translucency. This local differentiation of quality allows each region to optimize its specific function without compromising the other.

Inventive Principle:

Principle #3Local quality

2Illumination intensity

If second electrodes are provided only in a portion of a pixel, then optical transparency is achieved, but the emission spectrum becomes broad

Engineering Contradiction:

Improveoptical transparencyVSAvoidemission spectrum peak sharpness

Core Design Contradiction:

Illumination intensityVSMeasurement precision

Solution Approach 1:

The device structure segments the second electrode placement to specific light-emitting units rather than covering entire pixels, creating distinct light-emitting regions and light-transmitting regions. This segmentation enables the light-transmitting regions to maintain high optical transparency while the light-emitting units can incorporate optical filters for sharp emission spectrum peaks.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The optical filter is applied locally to the light-emitting units where second electrodes are positioned, while the light-transmitting regions without second electrodes maintain broad spectral transmission. This local application of filtering quality achieves sharp emission peaks where needed while preserving optical transparency in transmitting regions.

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

This configuration allows for a sharp emission spectrum peak while preserving the translucency of the light-emitting device, enhancing light extraction efficiency and maintaining sufficient optical transparency.

Implementation Method 1

an optical filter provided on a light-emitting surface of the substrate, the optical filter overlapped with the light-emitting unit and not overlapped with at least a portion of the light-transmitting region

Methodology Applied

Scientific EffectOptical filtering: Filter (optical)

Implementation Method 2

each light-emitting unit including a light-transmitting first electrode, a light-reflective second electrode, and an organic layer located between the first electrode and the second electrode

Methodology Applied

Scientific EffectLight reflection: Reflection

Implementation Method 3

light-emitting devices using organic EL

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS10686151B2Light-emitting device with see-through property using optical filters

Publication Date: 2020.06.16 PIONEER IP

AI summary

A plurality of light-emitting units (140) are provided on a first surface (100a) of a substrate (100), separated from each other. Each light-emitting unit (140) includes a light-transmitting first electrode (110), an organic layer (120), and alight-reflective second electrode (130). The organic layer (120) is located between the first electrode (110) and the second electrode (130). A light-transmitting region is located between the light-emitting units (140) and transmits light in the thickness direction of a light-emitting device (10). An optical filter (200) is overlapped with the light-emitting unit (140) and not overlapped with at least a portion of the light-transmitting region.