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The Calculation Method Of Led Display Power Supply And Power

Edit:Shaoxing Xinshan Science Technology Co.,Ltd   Date:Feb 28, 2017




A few days ago we weak current VIP technical communication group of friends asked questions about the led display power supply related, just yesterday, there are other friends asked, actually the problem is often encountered in the weak current project, today we will learn together to led display the calculation method of power supply and power.



Point spacing calculation method:


Each pixel to each point at the center of the distance between adjacent pixels;

Each pixel can be a LED lamp (such as: PH10 (1 r)],

Two leds [such as: PH16 (2 r)], three leds (such as: PH16 (2 r1g1b)].

P16 point spacing for: 16 mm; P20 point spacing for: 20 mm; P12 point spacing is: 12 mm



The length and height calculation method


Long distance x point = / high

Such as: PH16 length = 16 point x 1.6 ㎝ = 25.6 ㎝ height = x 1.6 ㎝ = 12.8 ㎝ at 8 o 'clock

PH10 length = 32 points x 1.0 ㎝ = ㎝ height = 16 point x 1.0 ㎝ = 16 ㎝



Screen using the module number calculation method


Total area of the present mould length height = present module using the module number

Such as: 10 square PH16 outdoor single color led display using module number is equal to:

10 square metre present 0.256 m members present 0.128 m = 0.256 material 305

More accurate calculation method: length using the module number x height using the module number = total use module

Such as: 5 meters high, 2 meters long PH16 use single color led display module:

Using the module number = 5 meters long present 0.256 m = 19.53125 material 20

Using the module number = 2 meters high present 0.128 m = 15.625 material 16

Use the module total number = 20 x 16 = 320



The calculation method of LED display visual range


RGB color mixing distance three colors blend into a single color:

LED full color range = (mm) x 500/1000 pixel spacing


The minimum viewing distance can display smooth image distance:

LED display visual range = (mm) x 1000/1000 pixel spacing


The best viewing distance clear picture the height of the viewers can see:

LED display the best stadia pixel spacing (mm) x = 3000/1000


As far as the viewing distance:

LED display farthest horizon = screen height (m) * 30 (times)



LED display scanning mode calculation method


Scanning mode: in certain display area, at the same time, light up the number of rows and the whole area in proportion to the number of lines.

Indoor single color is commonly 1/16 scanning,

The indoor full-color generally is 1/8 scanning,

Outdoor single color is usually 1/4 scan,

Outdoor full-color is generally static scan.


Currently on the market of LED display driver means has two kinds of static scan and dynamic scan, static scan is divided into static compaction pixels and static virtual, dynamic scanning is also divided into dynamic realities and dynamic virtual; MBI5026 driving device generally HC595 are needed in China, Taiwan, Japan's Toshiba TB62726, generally has a 1/2, 1/4, 1/8, 1/16.



Column to illustrate:

A common full-color module is 16 * 8 pixels (2 r1g1b), if use MBI5026 drive, module in use is:

16 * 8 * (2 + 1 + 1) = 512, MBI5026 for 16 chip, 512/16 = 32

(1) if with 32 MBI5026 chip, is static virtual

(2) if use 16 MBI5026 chip, 1/2 sweep virtual is dynamic

(3) if use eight MBI5026 chips, is a dynamic sweep virtual 1/4


If the board connecting two red lights

(4) with 24 MBI5026 chip, is static pixel

(5) with 12 MBI5026 chips, is a dynamic sweep 1/2 pixel

(6) with 6 MBI5026 chip, is a dynamic 1/4 scan pixels



In the LED unit board, scanning mode, 1/16, 1/8, 1/4, 1/2, static. If to distinguish?

One of the most simple way is to count the number of the LED unit board and the number of 74 hc595 are needed.

Method: LED divided by the number of divided by the number of 74 hc595 are needed 8 = a fraction of a scan

Real pixels is corresponding with the virtual: simply put,

Real pixel screen is refers to a display of red, green, blue three kinds of luminous tube in each kind of luminous tube only participate in a pixel imaging using, in order to obtain enough brightness.

Virtual pixels is to use the software algorithm control each color light-emitting tube eventually involved in multiple imaging of adjacent pixels, so that with less tubes of resolution, large to make the display resolution increase four times.



LED display power number calculation method


Power supply is a 30 and 40 a; Monochromatic is 8 unit board 1 40 a power source, double color is 6 unit board 1 power supply;

If full color unit board is good according to the maximum power to calculate full bright.


A, a power to take a couple of unit plate number = power supply voltage * power of current/cell board of horizontal pixel points/cell plate vertical pixel points / 0.1/2 such as: half outdoor P10:5 v40a power can bring: 40/5 * (32 * 16 * 0.1/0.5) = 7.8 take big eight;



B. according to the number of screen's total power and the required power = average total power/power of a power supply (power supply voltage * power supply current), for example: a bar screen long with 12 P10 module, high with three P10 module: a total of 36 module So the required power number = 32 * 16 * 0.1 * 36 * 40 = 4.6/0.5/5 big (5) power supply



LED display power calculation method


The formula for power is P = UI

P represents the power, voltage U representative, I represents the current, we usually used in the power supply voltage is 5 v, the power supply is a 30 and 40 a; Monochromatic is 8 unit board 1 40 a power source, double color is 6 unit board 1 power supply; Outdoor screen "product parameters" power reference website, there are very clear,


The following will be one example

Some unit to do 9 square meters of indoor 5.0 double color electronic screen, calculate how much power. Want to calculate the first 40 a number of power = 9 (0.244 * 0.488) / 6 = 12.5 = 13 power (be integers, as is standard) that is simple, the most powerful P = 13 * 40 a * 5 v = 2600 w.

Single lamp power = a lamp power 5 v * 20 ma = 0.1 W

LED display unit panel power = * resolution power of the single lamp (horizontal pixel points * vertical pixel points) / 2

The resolution of the screen of the maximum power = screen number * 0.1 * every resolution lamp

The resolution of the screen of the average power = screen number * 0.1/2 * every resolution lamp

The resolution of the screen body of the actual power = screen body * every count * 0.1 / scanning resolution lamp (4, 2, 16, 8, static)


LED display brightness calculation method


Brightness: screen overall brightness by single lamp brightness together.

For example, are as follows:

3906 points of P16 outdoor full color 2 r1pg1b (1/4 scan), dalian road, tube core of red luminescence brightness tube is 800 MCD, green lighting brightness of 2300 MCD, blue lighting brightness of 350 MCD, which can be theoretical brightness for a square (800 * 2 + 2300 + 350) * 4 = 4150 CD / 3906/1000


At the request of the clear brightness and point density conditions, the brightness of the single tube how computer?

Calculation method is as follows: (with two red, green, blue, for example)

Red LED lamp brightness: brightness (CD)/M2 present points/M2 * 0.3 present 2

The green LED lamp brightness, brightness (CD)/M2 present points/M2 * 0.6

Blue LED lamp brightness: brightness (CD)/M2 present points/M2 * 0.1

For example: per square metre 2500 density, 2 r1g1b, per square meter is 5000 CD/M2 brightness requirements, are:

Red LED lamp brightness is: 5000 present 2500 x 0.3 present 2 = 0.3

Green LED lamp brightness is: 5000 present 2500 x 0.6 present 2 = 1.2

Blue LED lamp brightness is: 5000 present 2500 * 0.1 = 0.2

Each pixel brightness is: 0.3 * 2 + 1.2 + 0.2 = 2.0 CD



The calculation method of LED display resolution


LED display resolution per square (unit into M) = 1 / pixel spacing/pixel spacing (unit into M) such as: P16 per square resolution = 0.016/1/0.016 = 3906 DOT (or points)


The Angle of LED display according to choose the LED lamp bead


Such as indoor table stick lamp: SMD0603/0805: H: V: 160 degrees 120 degrees

SMD3528 perspective: H: 140 V: 120 degrees

Insert outdoor lamp DIP: dip346/546: H: 110 V: 50 degrees


The LED luminous tube wavelength range:

Red: 625-630 nm

Kelly: 568-572 nm

Pure green: 520-530 nm

Blue: 460-470 nm

Yellow: 585-590 | nmled display calculation method of led electronic display power | led power calculation method


General brightness requirements are as follows:

(1) indoor: > 800 CD/M2

(2) half indoor: > 2000 CD/M2

(3) outside (south north) : > 4000 CD/M2

(4) outdoor (sits) : > 8000 CD/M2



The brightness of the red, green and blue on white composition requirements?


Red, blue, and green contribution in respect of the white colour is not the same. The root cause is due to human eyes networks membrane for different wavelengths of light feeling. After a great deal of experimental test about proportion, get the following options

Test design.

Simple than red, green and blue brightness is: 3:6:1

Accurate than red, green and blue brightness is: 3.0:5.9:1.1

Display the general aspect ratio is how much?

Determine the content of the graphic screen: according to the display,

Video screens: general for 4:3 or close to 4:3; The ideal ratio of 16:9.



The installation requirements of the display screen?


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

220 v mains power supply, wire zero line grounding line;

380 v mains power supply, three wire a zero line grounding line;

Kw or more screens should add step-down boot device.


Communication: communication distance is based on communication line length definition.

To install screen models used by the communication line length standard to install the communication line.

Communication line with the power cord on the same line pipe line.


Installation requirements: display installed around a horizontal, backward is not allowed

Lifting to retrofit regulating lever up and down

To put forward before hanging installation off the hook

Fall to the ground to get positioning support bolt installation.


In the LED industry, points (pixel point) to point interval corresponding relationship is as follows:

PH4 = 62500 PH4.7 = 44300

PH6 = 27800 PH8 = 15625

PH10 = 10000 PH11.5 = 7500

PH12 = 6400 PH12.5 = 6400

PH16 = 3906 PH20 = 2500

PH25 = 1600 PH31.25 = 1024

PH37.5 = 711 PH40 = 625

PH45 = 495 P50 = 400