Dyed Optical Interlayer for Low-Reflectance Electroluminescent Displays

Solution Overview

Problem

Electroluminescence display devices face a reduction in panel efficiency and increased power consumption due to the use of polarizing plates to reduce external light reflection.

Innovation Solution

A display device design that includes a substrate with subpixels, thin film transistors, protective layers, color filters, and optical filter layers containing absorbent materials to reduce external light reflection without using a polarizing plate.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a polarizing plate is used to reduce external light reflection, then visibility is improved, but transmittance is reduced and power consumption increases

Engineering Contradiction:

Improveexternal light reflectionVSAvoidpower consumption

Core Design Contradiction:

Object-affected harmful factorsVSUse of energy by moving object

Solution Approach 1:

The patent extracts the light reflection reduction function from the polarizing plate and implements it through a dedicated optical filter layer containing absorbent materials. This separates the anti-reflection function from the polarization function, allowing the polarizing plate to be removed or its role minimized, thereby reducing power consumption while maintaining visibility.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces an optical filter layer as an intermediary component between the display panel and the external environment. This layer contains absorbent materials that specifically target and absorb reflected external light, serving as a mediator that reduces harmful reflections without the need for a polarizing plate, thus improving transmittance and reducing power consumption.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If a polarizing plate is used to reduce external light reflection, then visibility is improved, but panel efficiency is reduced

Engineering Contradiction:

Improveexternal light reflectionVSAvoidpanel efficiency

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent extracts the light reflection reduction function from the polarizing plate and implements it through a dedicated optical filter layer containing absorbent materials. This separates the anti-reflection function from the polarization function, allowing the polarizing plate to be removed or its role minimized, thereby reducing power consumption while maintaining visibility.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the optical parameters of the display structure by introducing an optical filter layer with specific absorbent materials that have tailored absorption characteristics. This layer is designed to absorb reflected light in specific wavelength ranges while maintaining high transmittance for display light, thereby improving panel efficiency compared to traditional polarizing plate solutions.

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If a polarizing plate is used to reduce external light reflection, then visibility is improved, but transmittance is reduced

Engineering Contradiction:

Improveexternal light reflectionVSAvoidtransmittance

Core Design Contradiction:

Object-affected harmful factorsVSQuantity of substance

Solution Approach 1:

The patent introduces an optical filter layer as an intermediary component between the display panel and the external environment. This layer contains absorbent materials that specifically target and absorb reflected external light, serving as a mediator that reduces harmful reflections without the need for a polarizing plate, thus improving transmittance and reducing power consumption.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the optical parameters of the display structure by introducing an optical filter layer with specific absorbent materials that have tailored absorption characteristics. This layer is designed to absorb reflected light in specific wavelength ranges while maintaining high transmittance for display light, thereby improving panel efficiency compared to traditional polarizing plate solutions.

Inventive Principle:

Principle #35Parameter changes

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

Enhances panel efficiency and reduces power consumption by effectively minimizing external light reflection through the use of absorbent materials in the display device structure.

Implementation Method 1

an optical filter layer disposed on the color filter, including a first absorbent material, a second absorbent material, and a third absorbent material

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Data Source

PatentUS20250372042A1Display with dyed interlayer to reduce external reflectance

Publication Date: 2025.12.04 LG DISPLAY CO LTD

AI summary

An electroluminescence display device can include a substrate having first to third subpixels and having a light emission area and a non-light emission area for each of the first to third subpixels, a light emitting element disposed on the substrate and including a plurality of light emitting stacks configured to emit light of at least two different colors, a color filter disposed on the substrate and disposed in the light emission area of each of the first subpixel, the second subpixel and the third subpixel, and an optical layer disposed between the light emitting element and the color filter. The optical layer includes a plurality of different light wavelength absorbing materials configured to absorb one or more light wavelengths to emit light with one or more wavelengths.