LED backlight technology provides excellent brightness uniformity to enhance and improve the user experience. Basically, this means that the internal structure and placement of the backlighting allows for it to distribute light more evenly across the screen to make for high-definition visibility.

Fresnel lenses are lenses composed of a series of concentric rings. The Fresnel lens construction design allows for large aperture and short focal length with less mass and volume compared with a conventional lens design.

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Fresnel lenses are mostly used in the area of illumination, where non-ideal optical performance can be easily tolerated. For example, for the original application in lighthouses it was no problem that some of the light was not ideally directed. Fresnel lenses are widely used as condensers in overhead projectors, where the small thickness is of essential importance, but there is a number of other application areas such as projection TVs, traffic lights and concentrating solar power.

2021720 — Backlighting in photography is when the light source is to the rear of the shot, behind the subject.

Compared with an ordinary lens with a smooth surface shape, a Fresnel lens usually has substantially inferior optical properties; the steps cause some loss of light and scattering in unwanted directions. For the typical applications, however, such imperfections can be tolerated, while the advantage of a much reduced thickness and accordingly reduced weight can be beneficial or even essential.

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There are also cylindrical Fresnel lenses, where the curvature and the steps are only in one direction. Some devices are not even used for focusing (and may thus not be called lenses), but only for deflecting beams or images.

As an added bonus, LED backlight technology doesn’t contain any harmful substances such as mercury or lead, which makes it environmentally friendly.

Backlight display technology is a common application that’s used in a variety of interfaces including laptop computers, monitors, cellphone screens, TVs, keypads, and many more.

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Fresnel lenses are a special kind of optical lenses, where the surface profile contains annular steps such that a given focal length can be achieved with a substantially reduced thickness of the lens. This reduction of thickness can be very useful when realizing lenses with very large diameters and substantial dioptric powers. The original application of the inventor, Augustin-Jean Fresnel, was for lighthouses, where the light generated by a high-power lamp had to be redirected with a reasonably compact optical setup. This operation principle is illustrated in Figure 1, showing two versions of lenses with the same focal length. The upper version has more annular steps and can therefore be made thinner.

Another advantage of LED backlight technology is that it makes it easier for the user to control and display specific colour characteristics using a variety of hues including blue, red, and green.

The large gamut of colour distinctions creates a more unique and somewhat interactive user experience that helps serve whatever purpose the digital display is being used for. Users can manually play around with the lighting effects, colours, and brightness levels to create a specific effect that suits their needs.

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As the name suggests, backlighting involves providing lighting for digital displays from behind, making it easier for users to see what’s on the screen. There are multiple types of lighting technology that can be used for various applications depending on manufacturer and user preferences. LED backlighting is considered to be one of the most beneficial methods of illuminating digital displays.

Polarization is a fundamental property of light. It determines the oscillating directions of light during propagation.

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Knight Optical's Fresnel lenses are one of our most popular products. Our stock catalogue consists of standard Fresnel lenses with focal lengths from 3 mm to 650 nm, reverse configuration Fresnel lenses which are ideal for solar concentration applications, cylindrical Fresnel, and lenticular Fresnel lenses. Custom Fresnel lenses are also available with dimensions to 1000 mm or more.

In general, one will use aspheric shapes (→ aspheric lenses); given that the surface shape can anyway not be spherical, there would be no reason for choosing spherical shapes for the annular sections, if another shape gives better optical performance. For lenses with small steps, it may be sufficient to use conic shapes because this makes only a small difference, at least for non-imaging applications.

In contrast to the traditional CCFL lamps, LED backlight technology is far more advanced in the sense that it completely eradicates the light flickering across the screen. This makes for a much more efficient and enjoyable user experience whether the screen in question is a TV or laptop.

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Nauticomp Inc. is one of North America’s leading designers, manufacturers, and distributors of custom digital displays. From medical facilities to the hospitality industry to special military and marines operations, we’ve provided state-of-the-art digital displays featuring customizable LED backlight technology for countless applications. Contact us today to learn more about our digital displays or to place an order.

Shanghai Optics offers Fresnel lenses Fresnel lenses made of plastics for various applications – including custom versions tailored to your needs.

A first approach for designing such a lens may be simply to translate different annular sections of the surface in a parallel fashion, preserving their orientation. However, that approach would not lead to the same optical properties as the original thick lens. For better performance, the curvature of the outside parts should be adapted.

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In the area of diffractive optics, one sometimes uses similar looking designs of microlenses, where the steps are dimensioned such that they correspond to optical phase changes which are integer multiples of <$2 \pi$>. For Fresnel lenses, however, this principle is usually not used; they are purely refractive devices, not utilizing diffraction. It would actually be difficult to implement it for large lenses with the required precision. The contributions of different radial statements to an image are therefore generally considered as mutually incoherent, and the limitation of resolution by diffraction is related to the segment size rather than to the whole diameter of the lens, but diffraction-limited performances anyway often not reached. One may at least adjust the slopes of the steps such that the resulting disturbances for the light field are minimized.

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Different fabrication techniques can be used for Fresnel lenses. Frequently, one makes them in the form of plastic lenses, using molding or embossing processes. Glass Fresnel lenses can be fabricated with computer-controlled milling. Usually, Fresnel lenses are made as a single piece of material.

There are also imaging applications, for example lightweight hand-held magnifier lenses and even photography with compact cameras.

Since most LED backlight technology uses a very low voltage power supply of no more than 5-24 volts, this helps extend its overall lifespan, prevents the unit from overheating, and allows for longer display usage. This is why a lot of commercial digital display manufacturers integrate LED backlighting applications into their advanced designs.

LED backlighting generally lasts longer than its electroluminescent counterpart, with a lifespan of about 50,000 hours or more depending on the type and how it’s used. Industrial LED backlighting is typically more durable and long-lasting than commercial-grade backlight display technology because it gets more use.

Texas had the highest population of Fresnal families in 1920. Use census records and voter lists to see where families with the Fresnal surname lived. Within ...

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