Calculation method of LED display power supply and power

Calculating the power supply requirements for an LED display involves several steps to ensure that the display operates efficiently and safely. Here’s a detailed method to calculate the power supply and power requirements for an LED display:

Pixel spacing calculation method:

The center distance between each pixel and each adjacent pixel;

Each pixel can be an LED light [such as: PH10(1R)],

Two LED lights [such as: PH16(2R)], three LED lights [such as: PH16(2R1G1B)],

The dot spacing of P16 is: 16MM; the dot spacing of P20 is: 20MM; the dot spacing of P12 is: 12MM

How to calculate length and height

Pixel spacing × number of points = length/height

For example: PH16 length=16 points×1.6㎝=25.6㎝ height=8 points×1.6㎝=12.8㎝

                         PH10 length=32 points×1.0㎝=32cm height=16 points×1.0㎝=16㎝;

How to calculate the number of screen modules

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

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

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

A more accurate calculation method: number of modules used in length × number of modules used in height = total number of modules used

For example: the number of modules used for a PH16 monochrome LED display with a length of 5 meters and a height of 2 meters:

Number of long-use modules = 5 meters ÷ 0.256 meters = 19.53125 ≈ 20 modules

Number of highly used modules = 2 meters ÷ 0.128 meters = 15.625 ≈ 16 modules

Total number of modules used = 20 × 16 = 320

Calculation method of visible distance of LED display screen

The distance between RGB color mixing and mixing of three colors into a single color:

LED full-color screen viewing distance = pixel spacing (mm) × 500/1000

The minimum viewing distance at which a smooth image can be displayed:

LED display viewing distance = pixel spacing (mm) ×1000/1000

The most suitable viewing distance is the distance at which the viewer can see a highly clear picture:

The best viewing distance of LED display = pixel spacing (mm) × 3000/1000

Farthest viewing distance:

The farthest viewing distance of LED display = screen height (meters) × 30 (times)

LED display scanning method calculation method

Scanning method: In a certain display area, the ratio of the number of lines lit at the same time to the number of lines in the entire area.

Indoor single and double colors are generally scanned at 1/16.

Indoor full color is generally 1/8 scan,

Outdoor single and double colors are generally scanned at 1/4.

Outdoor full color is generally a static scan.

Currently, there are two driving methods for LED display screens on the market: static scanning and dynamic scanning. Static scanning is divided into static real pixels and static virtual. Dynamic scanning is also divided into dynamic real pixels and dynamic virtual. The driving devices generally use domestic HC595 and Taiwan MBI5026. , Japan’s Toshiba TB62726, generally has 1/2 scan, 1/4 scan, 1/8 scan, 1/16 scan.

List and explain:

A commonly used full-color module has a pixel size of 16*8 (2R1G1B). If driven by MBI5026, 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 a dynamic 1/2 scan virtual

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

If two red lights are connected in series on the board

(4) Use 24 MBI5026 chips, which are static real pixels

(5) Use 12 MBI5026 chips to dynamically scan 1/2 real pixels

(6) Use 6 MBI5026 chips to dynamically scan 1/4 real pixels

On the LED unit board, the scanning modes are 1/16, 1/8, 1/4, 1/2, and static. What if we differentiate?

One of the simplest ways is to count the number of LEDs on the unit board and the number of 74HC595s.

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

Real pixels correspond to virtual pixels: simply put,

A real pixel screen means that each of the three kinds of red, green and blue light-emitting tubes that make up the display screen only participates in the imaging of one pixel to obtain sufficient brightness.

Virtual pixels use software algorithms to control the light-emitting tubes of each color to ultimately participate in the imaging of multiple adjacent pixels, thereby achieving greater resolution with fewer light tubes and increasing the display resolution by four times.

Calculation method for the number of LED display power supplies

The power supply is 30A and 40A; the single color is 8 unit boards and one 40A power supply, and the double color is 6 unit boards and 1 power supply;

If it is a full-color unit board, it should be calculated based on the maximum power when it is fully lit.

  1. The number of unit boards that a power supply can carry = the voltage of the power supply * the current of the power supply / the number of horizontal pixels of the unit board / the number of vertical pixels of the unit board / 0.1/2 For example: Semi-outdoor P10: 5V40A power supply can carry :5*40/(32*16*0.1/0.5)=7.8 Take the larger 8;
  2. Calculate the number of required power supplies based on the total power of the screen = average total power/power of one power supply (power supply voltage * power supply current). For example: a strip screen uses 12 P10 modules for long and 3 P10 modules for high. Total group: 36 modules, then the number of power supplies required = 32*16*0.1*36*0.5/5/40=4.6, whichever is larger (5 power supplies)
LED display power calculation method

The formula for power is P=UI

P represents power, U represents voltage, and I represents current. Usually the power supply voltage we use is 5V, and the power supply is 30A and 40A; single color is 8 unit boards and 1 40A power supply, and double color is 6 unit boards and 1 power supply; For the power of the outdoor screen, please refer to the “Product Parameters” on the website. It is very clear there.

An example will be given below

A certain unit wants to build an indoor 5.0 two-color electronic screen covering an area of 9 square meters. Calculate the maximum power required. First, calculate the number of 40A power supplies = 9 (0.244*0.488)/6 = 12.5 = 13 power supplies (an integer is required, the larger one is the standard). Then it is very simple. The maximum power P = 13 * 40A * 5V = 2600W.

The power of a single lamp = the power of one lamp 5V*20mA=0.1W

The power of the LED display unit board = the power of a single lamp * resolution (number of horizontal pixels * number of vertical pixels) / 2

The maximum power of the screen = the resolution of the screen * the number of lights per resolution * 0.1

The average power of the screen = the resolution of the screen * the number of lights per resolution * 0.1/2

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

LED display brightness calculation method

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

Examples are as follows:

3906-point P16 outdoor full-color screen 2R1PG1B (1/4 scan), Dalian Lumei tube core, in which the red tube luminous brightness is 800mcd, the green tube luminous brightness is 2300mcd, and the blue tube luminous brightness is 350mcd, from which a square theory can be calculated The brightness is (800*2+2300+350)*3906/1000/4=4150cd

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

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

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

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

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

For example: density of 2500 points per square meter, 2R1G1B, brightness requirement per square meter is 5000 CD/M2, then:

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

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

The brightness of blue LED light is: 5000÷2500×0.1=0.2

The brightness of each pixel is: 0.3×2+1.2+0.2=2.0 CD

Calculation method of LED display resolution

LED display screen resolution per square = 1 / pixel pitch (unitized as M) / pixel pitch (unitized as M) For example: P16 Resolution per square = 1/0.016/0.016 = 3906 DOT (dots)

The viewing angle of the LED display depends on the LED lamp beads selected.

Such as indoor surface mount lights: SMD0603/0805: H: 160 degrees V: 120 degrees

SMD3528 Viewing angle: H: 140 degrees V: 120 degrees

Outdoor light DIP: dip346/546: H: 110 degrees V: 50 degrees

Wavelength range of each LED light-emitting tube:

Red: 625-630nm

Yellow-green: 568-572nm

Pure green: 520-530nm

Blue: 460-470nm

Yellow: 585-590nm led display calculation method | led electronic display power calculation | led power supply calculation method

General brightness requirements are as follows:

(1) Indoor: >800CD/M2

(2) Semi-indoor: >2000CD/M2

(3) Outdoor (sit south and face north): >4000CD/M2

(4) Outdoor (facing north and south): >8000CD/M2

What are the brightness requirements for red, green and blue in terms of white composition?

Red, green, and blue contribute differently to the color of white. The fundamental reason is that the retina of the human eye feels differently to light of different wavelengths. After a large number of experimental tests, the following approximate proportions are obtained for reference:

Test design:

The simple red, green and blue brightness ratio is: 3:6:1

The exact red, green and blue brightness ratio is: 3.0:5.9:1.1

What is the typical aspect ratio of a display screen?

Graphic screen: determined according to the displayed content;

Video screen: Generally 4:3 or close to 4:3; the ideal ratio is 16:9.

What are the installation requirements for the display screen?

Power supply requirements: The power supply connection point should be within the size of the screen

220V mains power supply, live wire, neutral wire and ground wire;

380V mains power supply, three live wires and one neutral wire for grounding;

Displays above kilowatts should be equipped with step-down starting equipment.

Communication requirements: Communication distance is defined by the length of the communication line.

The communication cable must be installed according to the communication cable length standard for the model of the display screen being installed.

Communication lines are prohibited from running in the same conduit as power lines.

Installation requirements: The display screen should be installed horizontally on the left and right sides, and backward tilting is not allowed.

Install upper and lower adjustment rods for hoisting

Before wall-mounting installation, a forward-tilting hook must be installed

For floor installation, positioning support bolts must be added.

In the LED industry, the corresponding relationship between the number of points (i.e. pixels) and the point spacing is as follows:

PH4=62500 points PH4.7=44300 points

PH6=27800 points PH8=15625 points

PH10=10000 points PH11.5=7500 points

PH12=6400 points PH12.5=6400 points

PH16=3906 points PH20=2500 points

PH25=1600 points PH31.25=1024 points

PH37.5=711 points PH40=625 points

PH45=495 points P50=400 points

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