Anti-Reflection Coating for Display Devices Blocking Infrared Radiation

Solution Overview

Problem

Traditional display devices experience overheating and damage due to strong sunlight reflection and infrared radiation penetration, leading to reduced service life and increased power consumption.

Innovation Solution

An anti-reflection coating comprising an anti-refractive composite layer, an oxidation protective layer, and a visible light anti-reflection layer with specific thickness ratios and refractive indices, which blocks infrared radiation and enhances visible light transmittance, reducing the need for high brightness and power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If traditional display devices operate at high brightness to overcome ambient light reflection, then visibility is improved, but power consumption and heat generation increase

Engineering Contradiction:

Improvedisplay brightnessVSAvoidpower consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The patent converts the harmful infrared radiation from sunlight into a beneficial filtering function by designing a multi-layer anti-reflection coating that selectively blocks infrared wavelengths while transmitting visible light. The harmful thermal radiation is transformed into a controlled optical filtering mechanism that protects the display device from overheating while maintaining visibility.

Inventive Principle:

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

Solution Approach 2:

The patent employs a composite multi-layer coating structure combining different materials with specific refractive indices (including aluminum-doped zinc oxide, niobium pentoxide, and other dielectric layers) to achieve simultaneous anti-reflection in visible range and infrared blocking. This composite structure allows optimization of both visible light transmission and infrared rejection properties.

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If traditional display devices operate at high brightness to overcome ambient light reflection, then visibility is improved, but heat generation increases causing overheating

Engineering Contradiction:

Improvedisplay brightnessVSAvoiddisplay device temperature

Core Design Contradiction:

Illumination intensityVSTemperature

Solution Approach 1:

The patent converts the harmful infrared radiation from sunlight into a beneficial filtering function by designing a multi-layer anti-reflection coating that selectively blocks infrared wavelengths while transmitting visible light. The harmful thermal radiation is transformed into a controlled optical filtering mechanism that protects the display device from overheating while maintaining visibility.

Inventive Principle:

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

Solution Approach 2:

The patent applies local quality by giving different layers of the coating different optical properties - the visible light anti-reflection layers have low refractive indices to minimize visible reflection, while the infrared blocking layers have high refractive indices and specific thicknesses to maximize infrared reflection. This localized functional differentiation allows simultaneous optimization of visible transparency and infrared blocking.

Inventive Principle:

Principle #3Local quality

3Illumination intensity

If traditional anti-reflection coating is used, then visible light transmittance is improved, but infrared radiation penetrates causing damage to internal components

Engineering Contradiction:

Improvevisible light transmittanceVSAvoidinfrared radiation damage

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the anti-reflection function into multiple distinct layers with different optical properties. The visible light anti-reflection layers (with lower refractive indices) handle visible spectrum optimization, while the infrared blocking layers (with higher refractive indices like niobium pentoxide) specifically address infrared radiation. This segmentation allows each layer to be optimized for its specific wavelength range without compromising the other function.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs a composite multi-layer coating structure combining different materials with specific refractive indices (including aluminum-doped zinc oxide, niobium pentoxide, and other dielectric layers) to achieve simultaneous anti-reflection in visible range and infrared blocking. This composite structure allows optimization of both visible light transmission and infrared rejection properties.

Inventive Principle:

Principle #40Composite materials

4Illumination intensity

If multi-layer anti-reflection coating is applied, then optical performance is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveoptical performanceVSAvoidcoating structure complexity

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The patent utilizes parameter changes by precisely controlling the thickness and refractive index of each layer to achieve the desired optical performance. The thickness of each layer is optimized to create constructive and destructive interference patterns that enhance visible light transmission while blocking infrared radiation. This parameter-based optimization allows complex optical functionality to be achieved through controlled physical dimensions rather than complex structural arrangements.

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

The anti-reflection coating effectively reduces reflectance in the visible light range, increases transmittance, and blocks infrared radiation, thereby decreasing heat absorption, extending the service life and reducing power consumption of display devices.

Implementation Method 1

the anti-reflection coating has a reflectance from 3% to 80% in a wavelength range of 780 to 2500 nm

Methodology Applied

Scientific EffectInfrared radiation blocking: Absorption (EM radiation)

Implementation Method 2

reflects 32-48% of heat radiation from sunlight

Methodology Applied

Scientific EffectThermal radiation reflection: Reflection

Implementation Method 3

the anti-reflection coating has a reflectance ranging from 0% to 1% in a wavelength range of 370 to 780 nm

Methodology Applied

Scientific EffectVisible light anti-reflection: Reflection

Implementation Method 4

enhancing a transmittance of visible light

Methodology Applied

Scientific EffectOptical transmittance enhancement: Refraction

Data Source

PatentUS20240201421A1Anti-Reflection Coating for Blocking Infrared Radiation and Display Device Including the Same

Publication Date: 2024.06.20 BUWON PRECISION SCI

AI summary

An anti-reflection coating for blocking infrared radiation and a display device including the same are provided. The anti-reflection coating includes an anti-refractive composite layer, an oxidation protective layer and a visible light anti-reflection layer. The oxidation protective layer is disposed on the anti-refractive composite layer, and the visible light anti-reflection layer is disposed on the oxidation protection layer. The anti-reflection coating has a reflectance ranging from 0% to 1% in a wavelength range of 370 to 780 nm, and has a reflectance ranging from 3% to 80% in a wavelength range of 780 to 2500 nm.