Lead:
LED display is currently one of the most widely used large display screens, including small-pitch LED displays, outdoor LED displays, transparent LED displays, etc.; applications involve multiple fields, so how much do you know about LED displays? Next, Winbond Ying Optoelectronics editor will take you to understand some basic knowledge.
Winbond P2 Indoor LED Display
1. Point spacing calculation method
The distance from each pixel to the center of each adjacent pixel; each pixel can be one LED light [e.g. PH10(1R)], two LED lights [e.g. PH16(2R)], three For a LED light [eg: PH16(2R1G1B)], the dot pitch of P16 is: 16MM; the dot pitch of P20 is: 20MM; the dot pitch of P12 is: 12MM...
Second, the length and width calculation of the screen
Length and height calculation method: point 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㎝=32㎝ height=16 points×1.0㎝=16㎝
3. Calculation of the number of screen modules
The calculation method of the number of modules used on the screen: total area ÷ module length ÷ module height = number of modules used
For example: 10 square PH16 outdoor monochromatic led display modules use modules equal to:
10 square meters ÷ 0.256 meters ÷ 0.128 meters = 305.17678≈305
A more accurate calculation method: the number of modules used in length × the number of modules used in height = the total number of modules used
Such as: PH16 monochrome led display with a length of 5 meters and a height of 2 meters. The number of modules used:
Number of long-use modules=5m÷0.256m=19.53125≈20
Number of high-use modules=2m÷0.128m=15.625≈16
The total number of modules used=20×16=320
Winbond Ying Photoelectric Indoor Display
Fourth, the calculation method of the visual distance of the LED display
RGB color mixing distance The distance between three colors mixed into a single color: LED full-color screen viewing distance = pixel pitch (mm) × 500/1000
The smallest viewing distance can display a smooth image distance: LED display visual distance = pixel pitch (mm) × 1000/1000
The most suitable viewing distance The distance at which the viewer can see a highly clear picture: the best viewing distance of the LED display = pixel pitch (mm) × 3000/1000
The farthest viewing distance: the farthest viewing distance of the LED display = screen height (m) × 30 (times)
Five, 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 color is generally 1/16 scan, led display calculation method | led electronic display power calculation | led power calculation method
Indoor full color is generally 1/8 scan, LED display calculation method | LED electronic display power calculation | LED power calculation method
Outdoor single and double color is generally 1/4 scan,
Outdoor full color is generally static scanning.
At present, there are two driving methods for LED display 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 image and dynamic virtual. The driving device generally uses domestic HC595, Taiwan MBI5026 , Japan Toshiba TB62726, generally have 1/2 scan, 1/4 scan, 1/8 scan, 1/16 scan.
A list of explanations: a commonly used full-color module pixel is 16*8 (2R1G1B), if it is driven by MBI5026, the module used in total is: led display calculation method | led electronic display power calculation | led power calculation method
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 dynamic 1/4 scan virtual
If the two red lights on the board are connected in series
(4) Use 24 MBI5026 chips, which are static real pixels
(5) Using 12 MBI5026 chips, it is a dynamic 1/2 scan real pixel
(6) Using 6 MBI5026 chips, it is a dynamic 1/4 scanning real pixel
On the LED unit board, the scanning methods are 1/16, 1/8, 1/4, 1/2, and static. How to distinguish?
One of the easiest ways is to count the number of LEDs on the unit board and the number of 74HC595.
Calculation method: the number of LEDs divided by the number of 74HC595 and then divided by 8 = a fraction of the scan
Real pixels correspond to virtual ones: in simple terms,
The real pixel screen means that each of the red, green and blue light-emitting tubes that constitute the display screen ultimately only participates in the imaging use of one pixel to obtain sufficient brightness.
The virtual pixel uses a software algorithm to control the light-emitting tube of each color to finally participate in the imaging of multiple adjacent pixels, so that a larger resolution can be achieved with fewer tubes, and the display resolution can be increased by four times.
Six, the calculation method of the number of LED display power supplies
(The power supply is 30A and 40A; the single color is 8 unit boards and 1 40A power supply, and the dual color is 6 unit boards and 1 power supply; if the full-color unit board is calculated according to the maximum power when it is fully lit)
a. 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 be taken ：5*40/(32*16*0.1/0.5)=7.8 whichever is larger 8; LED display calculation method|led electronic display power calculation|led power calculation method
b. Calculate the number of power supplies needed according to the total power of the screen = average total power / power of a power supply (power supply voltage * power supply current). For example: a long screen uses 12 P10 modules, and high uses 3 P10 modules. Group total: 36 modules, then the number of power supplies needed = 32*16*0.1*36*0.5/5/40=4.6 whichever is greater (5 power supplies)
Seven, LED display power calculation method
LED display calculation method | LED electronic display power calculation | LED power calculation method
The formula for power is P=UI led display calculation method | led electronic display power calculation | led power calculation method
P stands for power, U stands for voltage, and I stands for current. Usually the power supply voltage we use is 5V, the power supply is 30A and 40A; the single color is 8 unit boards and 1 40A power supply, and the dual color is 6 unit boards and 1 power supply; The power of the outdoor screen refers to the "product parameters" on the website. It is very clear there. An example will be given below. A company wants to make 9 square meters of indoor 5.0 two-color electronic screens to calculate the maximum power required. First, calculate the number of 40A power supplies = 9 (0.244*0.488)/6=12.5=13 power supplies (integers, based on the larger standard), it is very simple, the maximum power P=13 *40A*5V=2600W.
The power of a single lamp = the power of a lamp 5V*20mA=0.1W
The power of the LED display unit board = the power of a single lamp * resolution (the number of horizontal pixels * the 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)
Winbond Indoor Small Pitch LED Display
Eight, LED display brightness calculation method
LED display calculation method | LED electronic display power calculation | LED power calculation method
Brightness: The overall brightness of the screen is integrated by the brightness of a single lamp. For example, the following is an example: P16 outdoor full-color screen 2R1PG1B (1/4 scan) with 3906 points, Dalian Lumei tube core, of which the red tube has a brightness of 800mcd, and the green tube emits light. The brightness is 2300mcd, and the blue tube's luminous brightness is 350mcd. From this, a square theoretical brightness 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 dot density requirements?
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: 2500 dot density per square meter, 2R1G1B, brightness requirement per square meter 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 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
Nine, the calculation method of LED display resolution
LED display screen resolution per square = 1/pixel pitch (in units of M)/pixel pitch (in units of M) For example: P16 per square resolution = 1/0.016/0.016=3906 DOT (dots)
10. The viewing angle of the LED display depends on the selected LED lamp beads:
Such as indoor surface mount lights: SMD0603/0805: H: 160 degrees V: 120 degrees
SMD3528 Viewing angle: H: 140 degrees V: 120 degrees
Outdoor plug-in light DIP: dip346/546: H: 110 degrees V: 50 degrees
The wavelength range of each LED light-emitting tube: LED display calculation method | LED electronic display power calculation | LED power calculation method
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 calculation method
The general brightness requirements are as follows:
(1) Indoor: >800CD/M2
(2) Semi-indoor: >2000CD/M2
(3) Outdoors (sit south and face north): >4000CD/M2
(4) Outdoors (sit north and face south): >8000CD/M2
What are the brightness requirements of 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 human eyes feels differently for different wavelengths of light. After a large number of experimental tests, the following approximate ratios are obtained for reference design:
Simple red, green and blue brightness ratio: 3:6:1
The precise ratio of red, green and blue brightness is: 3.0:5.9:1.1
What is the general aspect ratio of the display?
Graphic screen: Determined according to the displayed content;
Video screen: Generally 4:3 or close to 4:3; the ideal ratio is 16:9.
Installation requirements of the display
Power supply requirements: the power supply connection point should be within the size of the screen
220V mains power supply, live wire neutral ground wire;
380V mains power supply, three live wires and one neutral ground wire;
Displays above kilowatts should be equipped with step-down start-up equipment.
Communication requirements: The communication distance is defined by the length of the communication line.
The communication line should be installed according to the length of the communication line used by the model of the installed display screen.
It is forbidden to run the communication line in the same conduit as the power line.
Installation requirements: the display screen is installed horizontally on the left and right, and the lifting is not allowed to install the up and down adjustment rods
Before wall-mounting, install the forward tilting hook and add positioning support bolts for floor-to-ground installation.
In the LED industry, the corresponding relationship between the number of points (i.e. pixel points) and the point pitch 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
