Display Unit IR Reflective Coating Solar Heat Management

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Solution Overview

Problem

Existing display devices, especially those used outdoors, face significant heating issues due to solar radiation, with current solutions either failing to adequately reduce heat input or compromising display quality through excessive reflection or absorption, particularly in the visible and infrared spectral ranges.

Innovation Solution

A display device comprising two disc-shaped elements with an IR-reflecting coating sandwiched between them, using a solid or liquid filling material and optionally an anti-reflective coating, to achieve high IR reflectivity and reduced visible light reflection, thereby minimizing heat input while maintaining display clarity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If IR-reflecting films (SIPLEX, XIR) are applied to reduce heat input, then infrared radiation reflection is improved, but visible light transmission is reduced and absorption increases causing heating of the front glass

Engineering Contradiction:

Improveheat input from solar radiationVSAvoidabsorption of solar radiation

Core Design Contradiction:

Object-affected harmful factorsVSLoss of energy

Solution Approach 1:

The patent segments the solar spectrum into different wavelength ranges and applies specialized coatings for each: anti-reflective coating for visible light (380-780 nm) to minimize reflection and heating, and IR-reflecting coating for infrared radiation (780-2500 nm) to reflect heat. This segmentation allows each coating to optimize its function without interfering with the other wavelength ranges.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses a composite structure combining two distinct coatings on the front glass: an anti-reflective coating layer and an IR-reflecting coating layer. This composite material approach allows the front glass to simultaneously achieve low visible light reflection and high infrared radiation reflection, resolving the contradiction between reducing heat input and minimizing energy absorption.

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If anti-reflective coating is applied to improve display contrast, then visible light reflection is reduced, but sun protection in the infrared range is not provided

Engineering Contradiction:

Improvedisplay contrastVSAvoidinfrared radiation heating

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent merges two separate functional coatings into a single integrated system on the front glass: anti-reflective coating for improving display contrast by reducing visible light reflection, and IR-reflecting coating for blocking infrared radiation heating. This combination allows the front glass to simultaneously achieve both objectives that were previously mutually exclusive.

Inventive Principle:

Principle #5Merging (Combining)

3Object-affected harmful factors

If IR-reflecting coating is applied to reflect infrared radiation, then heat input is reduced, but the coating absorbs significant energy causing the front glass to heat up

Engineering Contradiction:

Improveinfrared radiation reflectionVSAvoidfront glass temperature

Core Design Contradiction:

Object-affected harmful factorsVSTemperature

Solution Approach 1:

The patent changes the optical parameters of the front glass by applying coatings with specific spectral characteristics: anti-reflective coating with low reflection in visible range and IR-reflecting coating with high reflection in infrared range. This parameter change allows the system to reflect infrared radiation while minimizing absorption of solar energy, thereby reducing front glass temperature.

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 solution effectively reduces heat input from solar radiation by reflecting approximately 45% to 95% of IR radiation and minimizing visible light reflection, enhancing display clarity and reducing the need for complex cooling systems.

Implementation Method 1

an IR-reflecting coating introduced between the first disc-shaped and the second disc-shaped element in such a way that the first and the second disc-shaped element form a composite

Methodology Applied

Scientific EffectInfrared radiation reflection: Reflection

Implementation Method 2

the solar spectrum still has appreciable energy in this wavelength spectrum... radiation with wavelengths in the range 700 nm to approx. 1200 nm is particularly relevant for heating due to solar radiation

Methodology Applied

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

Implementation Method 3

an anti-reflective coating introduced between the first disc-shaped and the second disc-shaped element... minimizing visible light reflection

Methodology Applied

Scientific EffectVisible light reflection reduction: Reflection

Data Source

PatentEP2733522B1Display unit

Publication Date: 2021.06.09 SCHOTT AG

Figure 1a~1b
Figure 2
Figure 3a

AI summary

The device (10) has a polarizing filter (5) connected with a disk-shaped element (1) and another disk-shaped element, where a polarization direction of the polarizing filter is directed parallel to a polarization direction of a light emitted by a display device. An intermediate space is provided between the protection device and the display device. An infrared reflected layer reduces transmission of an infra red light to less than 10 percentages, where the infra red light exhibits wavelength between 780 and 2500 nanometer.