One of the simplest ways is to count the number of LEDs on the unit board and the number of 74HC595s.
Calculation method
Real pixels correspond to virtual ones: in simple terms, real pixel screens refer to the three types of red, green and blue light-emitting tubes that make up the display screen. Each type of light-emitting tube ultimately 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 supplies are 30A and 40A; single color requires 8 unit boards and 1 power supply of 40A; dual color requires 6 unit boards and 1 power supply; if the full-color unit board is used, it is best to calculate it according to the maximum power when it is fully lit;
- 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;
- 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 outdoor screens, refer to the “Product Parameters” on the website. It is very clear there. Here is an example. 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.
Power of a single lamp = Power of one lamp 5V*20mA=0.1W;
Power of the LED SMD Screen display unit board = Power of a single lamp * resolution (number of horizontal pixels * number of vertical pixels) / 2;
Maximum power of the screen = Resolution of the screen * Number of lights per resolution * 0.1;
Average power of the screen = Resolution of the screen * Number of lights per resolution * 0.1/2;
Actual power of screen = Resolution of screen*Number of lights per resolution*0.1/Number of scans (2, 4, 8, 16 scans, static)
LED display brightness calculation method
Brightness:
The overall brightness of the screen is integrated by the brightness of a single lamp. For example: 3906-point P16 outdoor full-color screen 2R1PG1B (1/4 scan), Dalian Lumei tube core, in which the red tube luminous brightness is 800mcd, and the green tube luminous brightness is 800mcd.
2300mcd, the luminous brightness of the blue tube is 350mcd, from which 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 clear requirements of brightness and dot density:
Calculation method follow by: (2 red, 1 green, and 1 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: red LED light brightness 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 the 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
Resolution per square of LED display = 1/pixel pitch (unitized as M)/pixel pitch (united as M);
For example: P16 resolution per square=1/0.016/0.016=3906 DOT (points);
The viewing angle of the LED display depends on the selected LED lamp beads:
- Such as indoor surface mount lights:
H: 160 degrees V: 120 degrees; for SMD0603
H: 140 degrees V: 120 degrees; for SMD3528
Outdoor lights:
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: 585-590nmled
- 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
- Illumination needs for RGB in terms of white configuration
Red, green, and blue contribute differently to the color of white. The fundamental reason is that the retina of the human eye perceives light of different wavelengths differently. After extensive experimental testing, the following approximate proportions are obtained for reference 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
- General aspect ratio of display screen:
Picture and text screen: determined according to the displayed content;
Movie screen: Usually 4:3 / close to 4:3; the best ratio is 16:9.
- Display installation requirements:
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 standards: The length of the communication connection determines the communication distance;
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 and hoisting are not allowed. Up and down adjustment rods must be installed;
Before wall-mounted installation, a forward-tilting hook must be installed, and positioning support bolts must be added for floor-mounted installation.
- 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.
Recommended Article: A brief discussion on LED SMD Screen electronic display issues
