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Kérdések és válaszok

Basic concepts for LED display specifications

Pixel pitch

The distance from the center point of one pixel to the center point of the adjacent pixel in millimeters. The pixel pitch was designated by the Latin letter P. For example, P6 means a screen with a pixel pitch of 6mm.

Sizes of the module ShhV (mm)

The physical size of the module (LED matrix) in millimeters.

Color temperature (K)

Color temperature is measured in Kelvin. As a rule, the color temperature is divided into 4 ranges:

  • warm white (2700-3200K)
  • neutral white or day (3500-4500K)
  • white (4700-6000K)
  • cool white (from 6000K and more).

Screen maintenance access

Installation and maintenance of the screen is possible from the front and back.

Refresh rate (Hz)

The number of times per second for which the LED screen hardware updates the playback data. By increasing the refresh rate of LED screens, flicker is reduced, thereby reducing eye strain on potential viewers.

Number of rooms

The cabinet is a sealed enclosure, on the front side of which there are several LED modules, and inside - the constituent elements: power supplies, cooling, receiving card. This configuration allows the cabinet to be an independent unit of the screen and work independently of the entire screen. Cabinets are used for assembling large screens and reusable. It is also possible to assemble in a modular design, manufacture of one cabinet of non-standard sizes with and without a profile.

Operating voltage (V)

The operating voltage of the LED screen supplied to the power supplies and the converted power for the operation of the LED modules and controllers.

LED service life (h)

This is the stated number of hours of continuous operation of the LED screen, after which the brightness is reduced by 50%. For example, 100,000 hours means approximately 11 years of continuous LED operation. It is also necessary to take into account that the power supply units operate on average 5 years. Replacing power supplies does not affect the color of the screen itself.

Warranty service

Warranty service is the repair of equipment by the supplier, subject to the rules of operation.

Pixel configuration

DIP configuration. The principle of implanting each diode into a circuit board in its own package. Due to the fact that each pixel is formed from a series of LEDs, reliability and overall brightness level of the LED screen increases. SMD configuration. Three LEDs of different color are combined in one case, sometimes they are designated RGB (3 in 1). SMD technology provides better and clearer color reproduction.

 

Grayscale

This is a range of shades of gray with no visible colors. The darkest shade is black, which is a complete lack of color and reflection of light. The brightest of the possible shades is white. Reflection of various shades of gray is provided by the three primary colors of the LED (red, green, blue). Monochrome modules reproduce shades within their color

Contrast

The ratio of the brightness of the lightest and darkest parts of the image.

Pixel density per m2

The number of pixels that are placed on an area of ​​1m2.

Frame rate (Hz)

The frequency with which the video stream is updated is measured in frames per second or hertz. A high frame rate is useful when transmitting a moving image in a video stream, as it maintains image clarity.

Screen weight (kg)

The total weight of the LED product in the complete set without taking into account the frame and sub-frame of the metal structure on which the LED screen is mounted.

Temperature mode of operation (°)

Maximum and minimum ° C designation for screen operation.

Screen Size (mm)

The size of the LED screen is selected depending on the distance from which potential viewers will look at it. The greater this distance, the, accordingly, the size of the LED screen should be larger.

Management / Software

Control of the LED screen is possible through a PC, server or video player. Depending on the controller, fully autonomous operation is possible. The software depends on the controllers supplied with the LED screen, without which the screen cannot work.

LED Manufacturer

Nichia (Japan), Cree (America), Epistar (Japan), Epistar + Silan (combined), Silan (China).

Color palette depth (bits)

The amount of information that is used to encode the color of a dot image. Measured in bits per point. The number of colors is 2 in the degree of the number of bits.

Maximum viewing angle (°)

The maximum angle from which the observer will see the image on the screen without distortion. There are horizontal and vertical viewing angles.                                           

Screen brightness (cd / m2)

Measures the intensity of light at the peak of white color on 1m2. The use of the unit of measure Nee / m2 is also common.

Power consumption W / m2 / h

The power consumed by the operation of the LED screen. The average is 250-300 W / m2, the maximum allowable 750-900 W / m2.

Screen brightness (cd / m2)

Measures the intensity of light at the peak of white color on 1m2. The use of the unit of measure Nee / m2 is also common.

Screen power consumption (kW / h)

The maximum power consumption is the peak load on the network at maximum brightness and white background of the screen. Average power consumption is a standard (nominal) mode of operation, provided video playback and a changing image with all color shades, where dark colors are dimly lit LEDs, and black color is transmitted by the complete absence of LED illumination.

The degree of protection from the external environment

To indicate the degree of protection against environmental influences, the IP code system is used in accordance with IEC 529-89 (GOST 142543-96). The degree of protection is encoded as IP XY, where X is the degree of protection against solid bodies and dust, and Y is the degree of protection against moisture. Consider some examples. IP 65, where 6 - dust penetration is completely eliminated, 5 - protection against a jet of water ejected from an arbitrary direction. IP 43, where 4 is protection from bodies with a diameter greater than 1 mm, 3 is protection against rain falling at an angle of 60 ° from the vertical.

Screen resolution (pixel)

Resolution is the size of a single point of the image on the screen. The larger the point, the lower the overall resolution of the screen and the greater the distance the viewer needs to be in order to see the continuous image.

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