OLED Light Absorption Dye for Micro-Lens Color Temperature

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Solution Overview

Problem

Organic light emitting display (OLED) devices face challenges in light out-coupling efficiency and color temperature, with micro-lens arrays improving brightness but decreasing color temperature and visual sensitivity.

Innovation Solution

Incorporating a light absorption material layer with a light absorption dye having a main absorption wavelength of 500 to 640 nm in the white pixel region, combined with a micro-lens structure on the overcoat layer, to enhance light out-coupling efficiency and maintain high color temperature.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If a micro-lens array is attached onto the substrate or a micro-lens is formed in the overcoat layer to improve light out-coupling efficiency, then light extraction is improved, but color temperature decreases and visual sensitivity of color black deteriorates

Engineering Contradiction:

Improvelight out-coupling efficiencyVSAvoidcolor temperature

Core Design Contradiction:

Loss of energyVSTemperature

Solution Approach 1:

A light absorption material layer is introduced as an intermediary component between the organic light emitting layer and the micro-lens structure. This layer selectively absorbs specific wavelengths of light that would otherwise degrade color temperature, while allowing beneficial light to pass through to the micro-lens for enhanced out-coupling efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent modifies the optical parameters of the system by introducing a light absorption material with specific absorption characteristics. This material changes the spectral distribution of light passing through the device, filtering out wavelengths that会降低 color temperature while preserving or enhancing overall light extraction efficiency.

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If current is increased to the organic light emitting diode to increase brightness, then brightness is improved, but power consumption increases and lifespan decreases

Engineering Contradiction:

ImprovebrightnessVSAvoidpower consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The patent converts the potentially harmful effect of light absorption into a beneficial feature by using the light absorption material layer to improve color temperature. This allows the device to achieve better optical performance without requiring increased current, thereby reducing power consumption and extending lifespan.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

By changing the optical parameters through the light absorption material layer, the patent improves light out-coupling efficiency and color temperature. This enables the device to achieve higher effective brightness at lower current levels, reducing power consumption and extending operational lifespan.

Inventive Principle:

Principle #35Parameter changes

3Loss of energy

If a micro-lens array is attached onto the substrate or a micro-lens is formed in the overcoat layer to improve light out-coupling efficiency, then light extraction is improved, but reflection ratio increases and visual sensitivity of color black decreases

Engineering Contradiction:

Improvelight extraction efficiencyVSAvoidreflection ratio

Core Design Contradiction:

Loss of energyVSObject-affected harmful factors

Solution Approach 1:

The light absorption material layer serves as an intermediary that reduces harmful reflections by absorbing light that would otherwise be reflected by the micro-lens structure. This maintains improved light extraction efficiency while eliminating the harmful effect of increased reflection ratio on visual sensitivity.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 improves light out-coupling efficiency and color temperature, providing high-quality images with increased brightness and visual sensitivity while reducing power consumption and extending the lifespan of the OLED device.

Implementation Method 1

a light absorption material layer with a light absorption dye having a main absorption wavelength of 500 to 640 nm

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

a micro-lens structure at a top surface of the overcoat layer

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS10516002B2Organic light emitting display device

Publication Date: 2019.12.24 LG DISPLAY CO LTD

AI summary

An organic light emitting display device includes a substrate including a plurality of pixel regions, a light absorption material layer in a white pixel region of the plurality of pixel regions and including a light absorption dye, an overcoat layer on the light absorption material layer, a micro-lens structure at a top surface of the overcoat layer, and an emitting diode on the micro-lens structure, wherein the light absorption dye has a main absorption wavelength of about 500 to 640 nm.