OLED Microcavity Pixel Structure for Light Efficiency

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Solution Overview

Problem

Organic light emitting display devices experience a decrease in light efficiency when white light emitted from the organic light emitting layer passes through color filters, and they require high voltage and current due to the use of color filters.

Innovation Solution

The organic light emitting display device is designed with a substrate and pixels that emit red, green, and blue light, featuring a white light emitting layer and thin film layers with varying thicknesses to achieve resonance, eliminating the need for color filters in some pixels and using a microcavity effect to enhance light emission, thereby improving light efficiency and reducing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If color filters are used to realize color display from white light, then color display is achieved, but light efficiency deteriorates

Engineering Contradiction:

Improvelight efficiencyVSAvoiduse of color filters

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The invention extracts and eliminates the color filters from the display device structure. Instead of using white light passing through color filters to achieve color display, the patent employs separate red, green, and blue light emitting layers that directly emit their respective colors without requiring filtering, thereby removing the harmful component and improving light efficiency

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The conventional approach is inverted: instead of generating white light and filtering it to obtain colors, the patent generates colors directly through separate red, green, and blue light emitting layers. This inversion eliminates the need for color filters and significantly improves light efficiency by avoiding the inherent losses of the filtering process

Inventive Principle:

Principle #13The other way round (Inversion)

2Illumination intensity

If color filters are used to achieve color display, then color purity is improved, but power consumption increases

Engineering Contradiction:

Improvecolor purityVSAvoidpower consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The invention segments the light emitting function into separate red, green, and blue light emitting layers. Each layer is responsible for emitting its specific color, eliminating the need for color filters. This segmentation maintains color purity while reducing power consumption by avoiding the energy losses associated with filtering white light

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If white light emitting layer is used with color filters, then color display is achieved, but manufacturing complexity increases

Engineering Contradiction:

Improvecolor display capabilityVSAvoidfabrication process

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The invention merges the color generation function into the light emitting layers themselves. By incorporating red, green, and blue light emitting materials directly into the organic light emitting layers, the patent eliminates the need for separate color filter layers and their associated alignment and fabrication processes, thereby simplifying manufacturing while maintaining full color display capability

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

This approach enhances light emission by optimizing the optical distances in each pixel, strengthens specific wavelengths, and simplifies the fabrication of the light emitting layer, resulting in improved light efficiency and reduced power consumption without the need for color filters.

Implementation Method 1

Each of the plurality of pixels is further configured to emit light of the one of the plurality of second colors when white light emitted from the white light emitting layer causes resonance to occur between the first electrodes and the second electrode

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

Methodology Applied

Scientific EffectMicrocavity effect:

Data Source

PatentUS8288784B2Organic light emitting display device

Publication Date: 2012.10.16 SAMSUNG DISPLAY CO LTD

AI summary

An organic light emitting display device includes a substrate and a plurality of pixels on the substrate. The pixels include a plurality of first electrodes, a second electrode, a white light emitting layer, and a first thin film layer between the first electrodes and the second electrode. White light emitted from the white light emitting layer causes resonance to occur between the first electrodes and the second electrode.