Training requirements

Q1. Calculation method of point spacing

The center distance between each pixel and each neighboring pixel;

Each pixel can be one LED light [such as PH10(1R)], two LED lights [such as PH16(2R)], three led lights [such as PH16(2R1G1B)], the point spacing of P16 is 16MM; The point spacing of P20 is 20MM; The spacing between points of P12 nodes is 12MM

Q2, length and height calculation method

Point spacing times number of points = length/height

For example: PH16 length =16 points ×1.6㎝=25.6㎝

Height = 8cm ×1.6 cm = 12.8cm

PH10 length =32 points ×1.0㎝=32㎝

Height =16 points ×1.0㎝=16㎝;

Q3, the screen body uses the method of module number calculation

Total area ÷ module length ÷ module height = number of modules used

For example, the number of modules used for 10 square PH16 outdoor monochrome led display is equal to:

10 square meters ÷0.256 meters ÷0.128 meters =305.17678≈305

More accurate calculation: Number of modules used for length × Number of modules used for height = Total number of modules used

For example: 5 meters long, 2 meters high PH16 monochrome led display number of modules:

Long use module number =5 m ÷0.256 m =19.53125≈20

High use module number =2 m ÷0.128 m =15.625≈16

Total number of modules used =20 x 16 =320

Q4. Calculation method of visual distance of LED display screen

RGB color mixing distance distance from three colors to a single color: LED full color screen line-of-sight = pixel spacing (mm)×500/1000

The minimum viewing distance can display the smooth image distance: LED display visual distance = pixel spacing (mm) ×1000/1000

The most suitable viewing distance The distance at which the viewer can see the highly clear picture: The best viewing distance of the LED display = the spacing of pixels (mm) ×3000/1000

Maximum viewing distance: Maximum viewing distance of LED display = screen height (m) ×30 (times)

Q5, LED display scanning mode calculation method Scanning mode

In a certain display area, the proportion of the number of lines lit at the same time to the number of lines in the whole area.

Indoor single or double color is generally 1/16 scan,

Indoor full color is generally 1/8 scan, outdoor single and double color is generally 1/4 scan, outdoor full color is generally static scan.

At present, there are two driving modes of LED display in the market: static scanning and dynamic scanning. Static scanning is divided into static real pixels and static virtual, and dynamic scanning is also divided into dynamic real image and dynamic virtual. The driving device is generally used domestic HC595, Taiwan MBI5026, Japan Toshiba TB62726, generally 1/2 sweep, 1/4 sweep, 1/8 sweep, 1/16 sweep.

List of notes:

A commonly used full-color module has 16*8 pixels (2R1G1B). If the MBI5026 driver is used, the total number of modules used is: 16*8* (2+1+1) =512, MBI5026 is a 16-bit chip, 512/16=32

(1) If 32 MBI5026 chips are used, it is static virtual

(2) If 16 MBI5026 chips are used, it is dynamic 1/2 sweep virtual

(3) If 8 MBI5026 chips are used, it is dynamic 1/4 sweep virtual

If two red lights on the board are connected

(4) With 24 MBI5026 chips, it is a static real pixel

(5) With 12 MBI5026 chips, it is dynamic 1/2 sweep real pixels

(6) With 6 MBI5026 chips, it is dynamic 1/4 sweep real pixels

In the LED unit board, the scanning mode has 1/16, 1/8, 1/4, 1/2, static. What if we differentiate?

One of the easiest ways to do this is to count the number of leds on the cell board and the number of 74HC595.

Calculation method: the number of leds divided by the number of 74HC595 divided by 8 = a fraction of a scan

The real pixels correspond to the virtual ones:

In simple terms, a solid pixel screen is one in which each of the red, green and blue light emitting tubes that make up the display is ultimately used to image only one pixel in order to obtain enough brightness. Virtual pixel is the use of software algorithm to control the light tube of each color eventually participate in the imaging of multiple adjacent pixels, so that less light tube to achieve a larger resolution, can improve the display resolution by four times.

Q6. Calculation method of power supply of LED display

Power supply is 30A and 40A; Single color is a 40A power supply for 8 unit boards, and dual color is a power supply for 6 unit boards. If the full color unit board is good according to the full light of the maximum power to calculate.

A. The number of unit boards in a power supply band = the voltage of the power supply * the current of the power supply/the number of transverse pixels of the unit board/the number of longitudinal pixels of the unit board /0.1/2 For example, the power supply of semi-outdoor P10:5V40A can be taken: 5*40/(32*16*0.1/0.5)=7.8 take 8;

b. Figure out the number of power supplies required according to the total power of the screen = average total power/power of a power supply (power supply voltage * Power supply current) For example, 12 P10 modules are used for a long screen and 3 P10 modules are used for a high screen. A total of 36 modules are used. Then the number of power supplies required =32*16*0.1*36*0.5/5/40=4.6 Take as large (5 power supplies)

Q7. LED display power calculation method

The formula for power is P=UI

P is for power, U is for voltage, I is for current, and usually the supply voltage we use is 5V, and the supply is 30A and 40A; Single color is a 40A power supply for 8 unit boards, and dual color is a power supply for 6 unit boards. The power of the outdoor screen is referred to the "product parameters" on the website, which are very clear.

Here's an example

Some unit SHOULD DO 9 SQUARE meters OF indoor 5.0 dual color ELECTRONIC screen, the largest calculation needs how many power. To calculate the number of 40A power supplies =9 (0.244*0.488) /6=12.5=13 power supplies (to be an integer, to be a large standard), then it is very simple, the maximum power P=13 *40A*5V=2600W. Power of a single lamp = Power of a lamp 5V x 20mA=0.1W

Power of LED display panel = power of single lamp * resolution (number of horizontal pixels * number of vertical pixels) /2

Maximum power of the screen = Resolution of the screen x Number of lights per resolution x 0.1

Average power of the screen = resolution of the screen x Number of lights per resolution x 0.1/2

Actual power of screen = resolution of screen * Number of lights per resolution *0.1/ number of scans (4 scans, 2 scans, 16 scans, 8 scans, static)

Q8. LED display brightness calculation method

Brightness: The overall brightness of the screen is integrated by the brightness of a single lamp.

Here are some examples:

P16 outdoor full color screen 2R1PG1B(1/4 scan) at 3906 points, Dalian Lume tube core, where the luminance of red tube is 800mcd, green tube is 2300mcd, blue tube is 350mcd, The theoretical brightness of a square can be calculated as (800*2+2300+350) *3906/1000/4=4150cd

How to calculate the brightness of a single tube under the condition of clear brightness and point density requirements?

The calculation method is as follows: (Take two red, one green and one blue as an example)

Red LED light: brightness (CD) /M2÷ points /M2×0.3÷2

Green LED light: brightness (CD) /M2÷ points /M2×0.6

Blue LED light: brightness (CD) /M2÷ points /M2×0.1

For example: 2500 points density per square meter, 2R1G1B, brightness per square meter is required to be 5000 CD/M2, then:

The light intensity of red LED is: 5000÷2500×0.3÷2=0.3

The light intensity of green LED is: 5000÷2500×0.6÷2=1.2

Blue LED light intensity: 5000÷2500×0.1=0.2

The brightness per pixel is 0.3×2+1.2+0.2=2.0 CD

Q9, LED display resolution calculation method

LED display per square resolution =1/ pixel spacing (unit: M)/pixel spacing (unit: M) For example: P16 per square resolution =1/0.016/0.016=3906 DOT

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