What is the main knowledge of LED display?
Author:Lumbar spermatozoa Time:2021-06-10 17:54 Browse(875)
1、 Classification of LED display
1、 Classification of LED displayClassification method and variety descriptionUsing environment indoor LED display screen indoor LED display screen used in indoor environment, this kind of display screen has moderate brightness, large viewing angle, short color mixing distance, light weight and high density, which is suitable for close viewing.

What is the main knowledge of LED display?

the indoor LED display screen is suitable for indoor environmentOutdoor LED display screen outdoor LED display screen is used in outdoor environment.
this kind of display screen has high brightness, long color mixing distance, high protection level, strong waterproof and anti ultraviolet ability, and is suitable for long-distance viewing.
this kind of display screen has many advantages, such as high brightness, long color mixing distance, high protection level, strong waterproof and anti ultraviolet abilityDisplay color single primary color LED display screen single primary color LED display screen is composed of LED lights of one color.
only single color, such as red, green, orange, etc., can be displayed.
single primary color LED display screen is composed of LED lights of one colorThe dual primary color LED display screen is composed of red and green LED lights.
the dual primary color display screen with 256 gray levels can display 65536 colors (the dual color screen can display red, green and yellow).
the dual primary color LED display screen can display 65536 colorsThe full-color LED display screen consists of red, green and blue LED lights.
it can display white balance and 16777216 colors.
the full-color LED display screen can display white balance and 16777216 colorsDisplay function graphic LED display screen (walkthrough screen) graphic LED display screen can display text, graphics, pictures and other information content.
it can be displayed online and offline.
it can be displayed onlineVideo LED display screen (synchronous screen) video LED display screen can display all kinds of information in real time and synchronously.
such as 2D or 3D animation, video, TV, video disc, live scene and other video information content.
Video LED display screen can display all kinds of information in real time and synchronously2、 The basic structure of LED display1. Asynchronous screen:Generally, it is composed of display unit board (module), strip screen card, switching power supply and hub board (optional).
the system is composed of display unit board (module), strip screen card, switching power supply and hub board (optional)Connect with the computer through the serial port cable.
change the display text, and then the computer can be disconnected.
after that, the computer can work2. Synchronization screen:The synchronous screen system is relatively complex.
the system can be large or small, and is generally composed of a computer, DVI graphics card, data sending card, synchronous data receiving card, hub board, network cable, LED display screen, etc.
the system always needs an on-line computer to work.
the image and text on the computer will be displayed on the LED screen.
the system is composed of a computer, a DVI graphics card, a data sending card, a synchronous data receiving card, a hub board, a network cable, and an LED display screen3、 Terms and concepts involved in LED display: 1It is the smallest imaging unit of LED screen.
commonly known as "point" or "pixel"As shown in the figure above, it consists of 2 red and 2 green pixels2. Display module:It is composed of several display pixels.
structurally independent, and it is the smallest unit of LED display screen.
it is composed of several display pixels·The indoor screen uses an 8x8 display module.
that is, each display module has 64 pixels·The outdoor screen uses a single lamp bead, which is usually composed of 1-3 lamp beads of the same or different colorsAs shown in the figure on the right above, the outdoor screen module is composed of two red lamp beads and one display pixel3. Display module:It is an independent unit of LED display screen, which is determined by circuit and installation structure and has display function.
in short, it is for the convenience of assembly and display.
semi finished products are usually provided in the form of display module, which combines multiple display modules with display driver.
indoor screen is commonly known as "unit board"; The outdoor screen is commonly known as "module". "
several modules, together with chassis, fan and power supply, are combined to form a" box ", which is mostly used for large full-color screens.
in this paper, the design of the outdoor screen is introduced·Indoor panel unit board usually has 64x32 (64 columns and 32 rows, composed of 32 modules), 64x16(64 columns, 16 rows, 16 modules)The figure below is a 64x16 unit boardFront of interior panel unit board back of interior panel unit board·There are 64x32, 32x32, 32x16, 16X16 and 16x8 outdoor screen modulesThe picture above shows a 16x8 (2 red) outdoor screen module.
a waterproof structure is added for outdoor use.
we can see the plastic shell. On the far right side is the layout of its whole structure: the lamp beads are inserted on the display board, and the display driving circuit is on the back board. This is a split structure, and some of them are the overall structure of making the display board and the display driving circuit on a circuit board, In the following two figures, we can see the difference.
the panel and the rear shell are actually a plastic shell.
there are holes in the corresponding lamp bead position on the panel to make the lamp bead leak out, and there are screw holes or magnetic columns for installation on the rear shell to make the module easy to assemble.
the front of the module is filled with special waterproof glue for the display screen.
the front of the module is filled with waterproof glueFront of outdoor screen moduleBack of outdoor screen moduleBack of outdoor screen module(display board and drive board are separate structure)(display board and drive board are integral structure)The cabinet of large outdoor full-color screen is usually composed of several modules + chassis + fan + power supply4. LED display screen body:The unit board / module / box is spliced together in a certain way.
with the control card / control system, power supply and frame, the LED display screen is formed.
the LED display screen can be formedIndoor screen: display unit board + control card + power supply + aluminum frameOutdoor screen: display module + control card + power supply + aluminum frameFull color screen: display box + control system + computer + communication network + rack, etc5. Point spacing:It is the distance between two pixels.
the distance between two pixelsIt mainly depends on the distance of the viewer.
generally, the concept of point distance is used for outdoor screen.
there are P6, p7.62, P8, P10, p12, p16, P20, etc., in mm.
the viewing distance of outdoor screen is generally within 30 meters.
the denser the point distance is.
the more delicate the strokes are, the more pixels per unit area, and the more expensive the display cost is.
the more detailed the strokes are6. Scanning mode:Generally speaking, there is a problem of scanning mode for outdoor screen module.
there is a problem of scanning mode for outdoor screen moduleScanning mode determines the connection form between modules.
there are 1 / 16, 1 / 8, 1 / 4, 1 / 2 and static scanning modes.
because the LED display is refreshed line by line.
scanning mode also determines the display refresh mode. For example, 1 / 16 is refreshed one line each time, 16 is a scanning cycle, and four ABCD signals are required to control; 1 / 8 is to refresh one line each time, 8 is a scan cycle, which needs three ABC signals to control; If the same LED light is used,
the brightness of 1 / 16 scan is lower than that of 1 / 8, and the static (1 / 1) brightness is the highest.
indoor screens generally use 1 / 16 scan.
outdoor and semi outdoor screens generally use 1 / 16 or 1 / 8.
for those placed in the environment where the screen is often exposed to strong sunlight,
it is best to use 1 / 4 scan.
for those placed in the environment where the screen is often exposed to strong sunlightScanning mode routing description diagram1 / 16 (one sixteenth) scan 16.0: straight walking line.
one way of data with 16 lines.
one way of data with 16 lines1 / 8 (one eighth) scan 8.0: straight walking line.
one way of data with 8 lines.
one way of data with 8 lines8.1: snaking on the top.
one way of data with 16 rows, 8 rows folded column.
all the way of data with 16 rows8.2: down snaking.
one way of data with 16 rows, 8 rows folded column1 / 4 (quarter) scan 4.0: straight walking line.
one data line with 4 lines.
the data line is straight walking line4.1: up snaking.
one way of data with 16 rows, 8 rows folded column.
14.2: down snaking.
one way of data with 16 rows, 8 rows folded column4.3: snaking on the top.
one way of data with 8 rows, 8 rows folded column.
24.4: down snaking.
one way of data with 8 rows, 8 rows folded column.
14、 Two conventional assembly methods of LED display screen1. Frame structureWhen the screen is small.
the whole screen is assembled in the factory; When the screen is large, it will be delivered according to the unit board.
it will be assembled on site by engineers.
when assembling.
the unit board and power supply will be fixed on the back strip of the plate rib respectively, and then assembled into the screen body.
when the screen is large, it will be delivered according to the unit board2. Box structureThe method of secret stealing is adopted between the box body and the box body, the positioning pin is used for positioning, and the locking mechanism is tightened.
both can make the installation more precise and accurate, and ensure that the LED spacing between the top, bottom, left and right of the box body is within the actual error requirements, The display effect of the whole screen is ensured as a whole.
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with the development of LED in the 1960s, many kinds of LED have been developed1) LED (light emitting diode): we call it lamp LED, P2 and plug-in led,In any case, as long as it is plug-in, it belongs to one kind.
and there are many kinds of LEDAccording to the colloid shape: 3mm, 4mm, 5mm, 8mm, 10mm, 12mm, square, oval, tombstone, and some special shapes, etc;According to colloid color: colorless transparent, colorless transparent, colorless scattering, colorless scattering, etc;By color: red, orange, yellow, green yellow, green, blue green, blue, pink, UV, white, infrared, etc;2) . SMD (surface mount device): surface mount diode or surface mount component is his name.
there are many categories in this one:According to the shape and size: 0603, 0805, 1210, 5060, 1010 and so on. Generally, SMD is diamond shaped, so it is called according to the length * width. The industry is good at using inch, not millimeter, but millimeter, not 1608 (1.6 * 0.8mm)The types of luminescent color and colloid are the same as those of LED products.
only the shape of the products has changed a lot.
the color and colloid of LED products are the same as those of LED products3) . piranha (flux LED): This is because the luminous efficiency of LED can not meet the requirements of automobile use.
therefore, we developed this product, which is a low-power product. Its driving current is generally 50mA, and the maximum current can reach 70ma. Because of its good heat dissipation, it is generally used in the rear tail lamp of automobile.
this product has been widely used in automobile industry4) . power LED: the existing LED products for lighting.
it has the following categories:According to power: 1W, 3W, 5W, etcAccording to the top luminous lens: flat head, spotlight, glass shape, etcAccording to the process, there are aluminum substrate and luminous proof5) . digital tube (display): the first used to do display and digital displayAccording to the shape: 1, 2, 3, 4 and so onSurface color: black glue with grey surface, white glue with black surface, etcPolarity: both yin and YangColor can also be used in many kinds, just like LED.
color can be used in many kinds6) . LED dot matrix: This product is almost the same as the digital tube.
it is used in information display.
the spacing and hole diameter are changed, which are different products.
now it is generally divided into 5 * 7 and 8 * 8, and its colors are monochrome, bicolor, tricolor, and so on.
this product can be used in information displayAccording to color: single red.
single green, double primary color, three primary color, etc;According to the diameter of the hole: φ 2.0, φ 3.0, φ 3.75, φ 0, etc;Points: 5 * 7, 8 * 8, 16 * 16, etcThere are also some other products, such as cluster, LED side light source, infrared & amp; transmitter; And so on.
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and so on
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