What is an LED Screen? Answers to the most Common Questions! (Part 1)

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What is an LED?

LED is the abbreviation of LIGHT EMITTING DIODE. LEDs in the LED display industry refer to LEDs that emit visible bands.

What is a pixel?

The minimum illumination unit of the LED display has the same meaning as the pixel described in the ordinary computer display.

What is the pixel pitch?

The center distance between two adjacent pixels, the smaller the spacing, the shorter the visible distance. The industry is often referred to as P to indicate the point spacing in mm.

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What is pixel density?

Also known as dot matrix density, it usually refers to the number of pixels per square meter of the display.

What is LED Cabinet?

A small unit consisting of several display pixels that are structurally independent and can form an LED display. Typical are 8*8, 8*7, etc.

What is SMT? What is SMD?

SMT is a surface assembly technology ( SURFACE MOUNTED TECHNOLOGY ) and is currently the most popular technology and process in the electronics assembly industry. SMD is a surface mount device. ( SURFACE MOUNTED DEVICE ).

What is an LED module?

It has a basic unit with circuit and installation structure, display function, and display function by the simple assembly.

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What is an LED Screen?

A display screen composed of an array of LED devices by a certain control method.

What is DIP LED module technology, what are the advantages and disadvantages?

It means that the lamp of the DIP package passes the lamp foot through the PCB board, and the tin is filled in the lamp hole by soldering. The module made by this process is the plug-in lamp group. The advantages are: high brightness, good heat dissipation, and the main disadvantage is that the pixel density is small.

What is surface mount SMD technology module? What are the advantages and disadvantages?

The surface mount is also called SMT. The SMT packaged lamp is soldered to the surface of the PCB board through the soldering process. The lamp pins do not need to pass through the PCB board. The module made by this process is called the surface mount module. The advantage is that the display effect is good. Large pixel density, suitable for indoor viewing: the disadvantage is that the brightness is not high enough, the lamp itself is not good enough.

What is sub-surface SMD technology module? What are the advantages and disadvantages?

The sub-surface label is a product between DIP and SMT. Its LED lamp has the same package surface as SMT, but its positive and negative pins are the same as DIP, and it is also soldered through PCB. The advantages are high brightness, good display effect and the disadvantages are complicated processes and difficult maintenance.

What is 3 in 1 line? What are its advantages and disadvantages?

The RGB three independent package SMT lamps are vertically juxtaposed at a certain interval, which not only has the advantages of 3-in-1 but also solves various shortcomings of the three-in-one.

What is the Dual Primary Color, Pseudo-Color, Full-Color Display?

Different color LEDs can be used to form different display screens. The two primary colors are composed of red, green or yellow and green. The pseudo color is composed of three different colors: red, yellow green and blue. The full color is red. , pure green, pure blue three different colors.

What is the brightness?

The intensity of light emitted by the LED display unit per unit area is CD/square meter, which is simply the light intensity emitted by a square meter display.

What is the brightness level?

The number of levels of manual or auto-adjustment of the brightness of the entire screen between the lowest and highest brightness.

What is Grayscale?

Technical processing levels between the darkest and the brightest at the same brightness level.

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What is the maximum brightness?

Under certain ambient illumination, the primary colors of the LED display are at the maximum brightness and maximum gray level.

What is moiré?

When shooting a full-color LED display at work, some irregular water ripples appear on the LED display screen. These water ripples are called “moiré” in physics.

What is PCB?

PCB (Printed Circuit Board) is a printed circuit board.

What is the resolution of the LED modules?

Refers to how many pixels a LED module has. Usually expressed by the expression of the number of rows of LED module multiplied by the number of columns. (eg: 64(W)×32(H) pixels)

What is BOM?

BOM ( Bill of Material ) is a list of materials

What is white balance and what is white balance adjustment?

The white balance we mean is the balance of white, that is, the balance of the brightness ratios of the three colors of RGB; the adjustment of the brightness ratio of the three colors of RGB and the adjustment of the white coordinates is called white balance adjustment.

What is the contrast?

The ratio of the maximum brightness of the LED display to the background brightness under a certain ambient illumination.

What is the color temperature?

When the color emitted by the light source is the same as the color of the black body at a certain temperature, the temperature of the black body is called the color temperature of the light source.

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What is the color difference?

The LED display is composed of red, green and blue colors to produce various colors, but the three colors are made of different materials, the viewing angle is different, and the spectral distribution of different LEDs is varied. These differences can be observed. For color difference. When the LED is viewed at a certain angle, its color changes, and the ability of the human eye to judge the color of the real picture (such as a movie picture) is better than that of the observation computer.

What is the refresh rate?

The number of times that an image is repeatedly displayed by the display in unit time.

What is the perspective? What is the angle of view? What is the best perspective?

The viewing angle is when the brightness of the viewing direction drops to 1/2 of the brightness of the normal of the LED display. The angle between the two observation directions of the same plane and the normal direction. Divided into horizontal and vertical viewing angles; the viewing angle is the angle between the direction of the image content on the display and the normal to the display screen. The best viewing angle is that you can just see the content on the display, and it is not flat, the angle between the clearest direction of the image and the normal.

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