FAQs

Product FAQs

Yes you can! Take a look at our LED Screen Rental Page or call us on 01253 302 723 to discuss your requirements

Yes, we provide training and guidance in the safe and correct use of your digital display.

Build and delivery times vary considerably depending on the nature of the display and installation location. As such, we will communicate directly with you to arrange delivery and installation times that take into account our lead times, and try to find a time that suits you.

For help with installation, maintenance or repair please call us now on +44 (0)1253 302 723 or raise a ticket to receive a response from our engineers. Click the link http://ticket.scanlite.net

Technical FAQs

An LED, or Light Emitting Diode, is an electroluminescent semiconductor, or simply put, a low energy light source. LEDs are highly efficient compared to traditional incandescent light sources, such as light bulbs, and have the ability to switch at much higher rates than traditional light sources. They also benefit from much longer service lifetimes than traditional light bulbs, lower operational temperatures, smaller sizes, and LEDs are more physically robust than their counterparts. This combination of traits makes them ideal for digital signage and electronic advertising purposes, particularly for use in LED video displays, time and temperature displays and electronic safety signage.

An LED Display is a display that uses LEDs to generate the light to illuminate a display. These can come in several forms, the most common being LED backlit displays, which use LEDs to illuminate an LCD or Plasma panel. These are particularly prevalent for use in Home TVs, LED office displays and digital menus. Another form of LED Display is the Surface Mount Device (SMD) form, which Scanlite specializes in. These displays do not use an LCD or plasma layer to form the picture, rather the LEDs themselves form the pixels of the display.

A pixel (short for ‘picture element,’ AKA a ‘dot’) refers to the smallest possible independent light/colour source in an image. A pixel can display a colour independent of the pixel next to it. A collection of pixels makes up an image. Typically, if a display is viewed from it’s intended viewing distance an individual pixel will not be visible to the eye.

An image or video’s resolution refers to the number of pixels in the horizontal and vertical axis. For example, a typical modern HD television will have a resolution of 1920 x 1080. This means 1920 pixels in the horizontal axis, and 1080 in the vertical, and is consequently referred to as a ‘1080p display’. The newer 4K televisions have a resolution that is 4 times higher than that, at 3840 x 2160, which has since been referred to as ‘4K’ due the nearly 4,000 pixels in the horizontal axis. As you can see, naming conventions aren’t exactly set in stone, even for TVs. As such, in the LED Digital Signage industry we typically refer to the pixel resolution as a set of numbers, consisting of the horizontal pixel count, then the vertical pixel count, and then often state the pixel pitch too.

Pixel pitch refers to the size of the gap between pixels in a display. In LCD, OLED and plasma displays, such as we find in televisions and smartphones, a different terminology is used to express a similar concept: PPI (points per inch) or DPI (dots per inch). These measures tell us the concentration of pixels in a given area, rather than expressing the distance between pixels. For example, a smartphone may have a very high DPI count, sometimes above 300DPI. However, in the world of large scale digital signage and SMD LED Displays, such resolutions are neither possible nor necessary, and so we talk in terms of pixel pitch instead. Older LED Displays, for example for use at large outdoor events, often had pixel pitches of 20mm or more, meaning there would be 2cm between pixels. On a large screen where the audience is a good distance away, this would be adequate to display video, text and images such that the audience saw them as good quality, however, a 20mm pixel pitch would be completely useless on a device we view up close, such as a smartphone. For this reason the intended viewing distance of the audience is very important when considering what pixel pitch is right for you. Image quality is also a factor; a lower pixel pitch display will look better at more viewing distances. Modern LED Displays can have pixel pitches measured below a millimetre, so exceptionally close together, producing very fine detail images, even at relatively close ranges. Another consideration is price – as pixel pitch get smaller, so the displays get more expensive, due to the increased costs of greater manufacturing precision and smaller components. For more information on the relationship between pixel pitch and viewing distance, please view the ‘What pixel pitch do I need for my viewing distance?’ section below.

The following table gives approximate recommended minimum viewing distances for a given pixel pitch:

Pixel Pitch P1 P2 P3 P4 P5 P6 P8 P10 P12 P16 P20 P25
Viewing Distance (m) 2.2 4.4 6.6 9 11 14 18 23 28 35 47 56
Viewing Distance (ft) 7 14 22 30 36 46 58 77 92 116 155 185

The smallest pixel pitches Scanlite can currently offer varies depending on the intended usage of the display. For internal displays, the smallest pixel pitch we offer is 0.8mm. For weatherproof external LED displays the smallest pixel pitch we can offer is 2.67mm.

The refresh rate of a display is the rate at which the picture can be refreshed. On may TVs this is 50 Hz, or 50 ‘refreshes’ per second, although modern high end TVs can have refresh rates up to 240Hz. This means, that 240 distinct, different images could be displayed per second. LED displays can have refresh rates of up to 1200Hz, due to the exceptionally fast switching that is possible with LEDs, though obviously such a refresh rate is not required for a viewer. As such a typical refresh rate may be 60Hz or 120Hz

Scanlite can build displays for almost any purpose, and as such a waterproof LED display is all in a day’s work! As we are a Blackpool based company, a number of our LED Video Displays have been installed on Blackpool promenade, meaning they have been built to withstand the rigours of high speed onshore winds, sea spray and rain. A display’s dust/water resistance is often described by it’s IP rating. An outline of IP ratings is offered below.

An IP rating, or ‘ingress protection’ rating describes the level to which a device enclosure is protected against ingress by various solids and liquids. The first number of an IP rating refers to solids, where 0 is no protection, and 6 is full protection from the ingress of dust. The second number deals with the protection an enclosure provides from liquids, where 0 is no protection, and 8 means the device can be submerged under water to 1m – meaning that the device is hermetically sealed.

First digit: Solid particle protection

The first digit indicates the level of protection that the enclosure provides against access to hazardous parts (e.g., electrical conductors, moving parts) and the ingress of solid foreign objects, such as dust, fingers etc.

Level sized Effective against Description
0 No protection against contact and ingress of objects
1 >50 mm Any large surface of the body, such as the back of a hand, but no protection against deliberate contact with a body part
2 >12.5 mm Fingers or similar objects
3 >2.5 mm Tools, thick wires, etc.
4 >1 mm Most wires, slender screws, large ants etc.
5 Dust protected Ingress of dust is not entirely prevented, but it must not enter in sufficient quantity to interfere with the satisfactory operation of the equipment.
6 Dust tight No ingress of dust; complete protection against contact (dust tight). A vacuum must be applied. Test duration of up to 8 hours based on air flow.

 

Second digit: Liquid ingress protection

The second digit indicates the level of protection that the enclosure provides against harmful ingress of water.

Level Protection against Effective against Details
0 None
1 Dripping water Dripping water (vertically falling drops) shall have no harmful effect on the specimen when mounted in an upright position onto a turntable and rotated at 1 RPM. Test duration: 10 minutes

Water equivalent to 1 mm rainfall per minute

2 Dripping water when tilted at 15° Vertically dripping water shall have no harmful effect when the enclosure is tilted at an angle of 15° from its normal position. A total of four positions are tested within two axes. Test duration: 2.5 minutes for every direction of tilt (10 minutes total)

Water equivalent to 3 mm rainfall per minute

3 Spraying water Water falling as a spray at any angle up to 60° from the vertical shall have no harmful effect, utilizing either: a) an oscillating fixture, or b) A spray nozzle with a counterbalanced shield.

Test a) is conducted for 5 minutes, then repeated with the specimen rotated horizontally by 90° for the second 5-minute test. Test b) is conducted (with shield in place) for 5 minutes minimum.

For a Spray Nozzle:

Test duration: 1 minute per square meter for at least 5 minutes
Water volume: 10 litres per minute
Pressure: 50–150 kPa

For an oscillating tube:

Test duration: 10 minutes

Water Volume: 0.07 l/min per hole

4 Splashing of water Water splashing against the enclosure from any direction shall have no harmful effect, utilizing either: a) an oscillating fixture, or b) A spray nozzle with no shield.

Test a) is conducted for 10 minutes. Test b) is conducted (without shield) for 5 minutes minimum.

Oscillating tube: Test duration: 10 minutes, or spray nozzle (same as IPX3 spray nozzle with the shield removed)
5 Water jets Water projected by a nozzle (6.3 mm) against enclosure from any direction shall have no harmful effects. Test duration: 1 minute per square meter for at least 3 minutes

Water volume: 12.5 litres per minute
Pressure: 30 kPa at distance of 3 m

6 Powerful water jets Water projected in powerful jets (12.5 mm nozzle) against the enclosure from any direction shall have no harmful effects. Test duration: 1 minute per square meter for at least 3 minutes

Water volume: 100 litres per minute
Pressure: 100 kPa at distance of 3 m

6K Powerful water jets with increased pressure Water projected in powerful jets (6.3 mm nozzle) against the enclosure from any direction, under elevated pressure, shall have no harmful effects. Found in DIN 40050, and not IEC 60529. Test duration: at least 3 minutes

Water volume: 75 litres per minute
Pressure: 1000 kPa at distance of 3 m

7 Immersion, up to 1 m depth Ingress of water in harmful quantity shall not be possible when the enclosure is immersed in water under defined conditions of pressure and time (up to 1 m of submersion). Test duration: 30 minutes – ref IEC 60529, table 8.

Tested with the lowest point of the enclosure 1000 mm below the surface of the water, or the highest point 150 mm below the surface, whichever is deeper.

8 Immersion, 1 m or more depth The equipment is suitable for continuous immersion in water under conditions which shall be specified by the manufacturer. However, with certain types of equipment, it can mean that water can enter but only in such a manner that it produces no harmful effects. The test depth and/or duration is expected to be greater than the requirements for IPx7, and other environmental effects may be added, such as temperature cycling before immersion. Test duration: Agreement with Manufacturer

Depth specified by manufacturer, generally up to 3 m

9K Powerful high temperature water jets Protected against close-range high pressure, high temperature spray downs.

Smaller specimens rotate slowly on a turntable, from 4 specific angles. Larger specimens are mounted upright, no turntable required, and are tested freehand for at least 3 minutes at distance of 0.15–0.2 m.

There are specific requirements for the nozzle used for the testing.

This test is identified as IPx9 in IEC 60529.

Test duration: 30 seconds in each of 4 angles (2 minutes total)

Water volume: 14–16 litres per minute
Pressure: 8–10 MPa (80–100 bar) at distance of 0.10–0.15 m
Water temperature: 80 °C