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# Learn LED electronic display technology Learn LED display screen skills

2019-08-14

It is necessary to learn the following calculation methods：

1、Point spacing calculation method：

a central partition between each pixel point and each adjacent pixel point;Each pixel can be an LED light

[eg PH10 (1R)], two LED lights [eg PH16 (2R)], three led lights [eg PH16 (2R1G1B)], P16 dot spacing: 16MM; P20 dot spacing: 20MM ; P12 point spacing is: 12MM.

2、Length and height calculation method：

Point spacing × points = length / height.

Such as: PH16 length = 16 points × 1.6cm = 25.6cm; height = 8 points × 1.6cm = 12.8cm. PH10 length = 32 dots x 1.0 cm = 32 cm; height = 16 dots x 1.0 cm = 16 cm.

3、 The screen uses the number of modules to calculate the total: total area ÷ module length ÷ module height = the number of modules used.

Such as: 10 square PH16 outdoor monochrome led display screen using the number of modules is: 10 square meters ÷ 0.256 meters ÷ 0.128 meters = 305.17678 ≈ 305. More precise calculation methods: length using the number of modules × height using the number of modules = using the total number of modules.

Such as: PH5 monochrome led screen with 5 meters long and 2 meters high, the number of modules used:
The number of long-use modules = 5 meters ÷ 0.256 = 19.53125 ≈ 20.
The number of high-utilization modules = 2 meters ÷ 0.128 meters = 15.26 ≈ 16 pieces.
The total number of modules used = 20 × 16 = 320.

4、 The LEDs reflect the calculation of the screen partition:

RGB color confusing three-color confusing into a single color partition:

LED full color screen line of sight = pixel point spacing (mm) × 500 / 1000;

The smallest visual partition can reflect the smooth image partition: LED display visible partition = pixel spacing (mm) × 1000/1000;

The most suitable visual cut-offs can see the partition of the highly clear picture: LED display screen best line of sight = pixel point spacing (mm) × 3000/1000;

The farthest cut-off: LED display screen farthest viewing distance = screen height (m) × 30 (times).

5、 LED embossed screen scanning method calculation method：

Scanning method: The ratio of the number of rows lit at the same time to the number of rows in the entire region in a positive reflection area.

Indoor single and double color is usually 1/16 scan, indoor full color is usually 1/8 scan, outdoor single color is usually 1/4 scan, and outdoor full color is usually static scan.

6、 LED embossed screen power supply number calculation method：

(The power supply is 30A and 40A; the monochrome is a 40-unit power supply for 8 unit boards, and the two-color unit is 6 units for one power supply; if the full-color unit board is just the maximum power at full brightness)
a. The number of cells that can be brought to a power supply = the voltage of the power supply * the current of the power supply / the number of horizontal pixels of the cell board / the number of vertical pixels of the cell board / 0.1 / 0.5 Example: semi-outdoor P10: 5V40A power supply can be :5*40/(32*16*0.1/0.5)=7.8 Take 8 large;
b. Find the required number of power sources according to the total power of the screen body = the total power of the distribution / the power of a power supply (power supply voltage * power supply current). For example: one strip screen is used for 12 P10 modules, and high for 3 P10 modules. Total: 36 modules, then the number of power required = 32 * 16 * 0.1 * 36 * 0.5 / 5 / 40 = 4.6 take large (5 power).

7、LED embodies screen power calculation essentials：

The formula for power is P=UI
P stands for power, U stands for voltage, I stands for current, usually the power supply voltage we use is 5V, the power supply is 30A and 40A; the monochrome is a 40A unit with 8 units of power supply, and the two colors are 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 unit needs to do 9 square meters of indoor 5.0 color electronic screen to calculate the maximum necessary power. First calculate the number of power supply of 40A = 9 (0.244 * 0.488) / 6 = 12.5 = 13 power supply (to be an integer, to a large scale) then very simple, the maximum power P = 13 * 40A * 5V = 2600W.
Single lamp power = one lamp power 5V * 20mA = 0.1W;
The LED reflects the power of the panel unit board = the power of the single lamp * the discrimination rate (the number of horizontal pixels * the number of vertical pixels) / 2;
The maximum power of the screen body = the discrimination rate of the screen body * the number of lamps per discrimination rate * 0.1;
The symmetrical power of the screen body = the discrimination rate of the screen body * the number of lamps per discrimination rate * 0.1 / 2;
The actual power of the screen = the discrimination rate of the screen * the number of lights per discrimination rate * 0.1 / the number of scans (4 sweeps, 2 sweeps, 16 sweeps, 8 sweeps, static).

8、LED screen brightness calculation essentials：

Brightness: The brightness of the screen is integrated by the brightness of a single lamp, for example: 3906 P16 outdoor full color screen 2R1PG1B (1/4 scan), Dalian Lumei die, the red tube luminous brightness is 800mcd, green The brightness of the tube is 2300mcd, and the brightness of the blue tube is 350mcd, so that the theoretical brightness of a square can be calculated as (800*2+2300+350)*3906/1000/4=4150cd.
Then, under the condition that the LED display screen skill understands the brightness and dot density, how to calculate the brightness of the single tube of the machine? (taking two red, one green, one blue as an example)
Red LED brightness: brightness (CD) / M2 ÷ points / M2 × 0.3 ÷ 2;
Green LED brightness: brightness (CD) / M2 ÷ points / M2 × 0.6;
Blue LED brightness: brightness (CD) / M2 ÷ points / M2 × 0.1.
For example: 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 the blue LED light is: 5000÷2500×0.1=0.2;
The brightness per pixel is: 0.3 × 2 + 1.2 + 0.2 = 2.0 CD.

9. LED embodies the calculation method of screen discrimination rate：

LED electronic display per square resolution = 1 / pixel pitch (unitized to M) / pixel pitch (unitized to M), such as: P16 per square resolution = 1 / 0.016 / 0.016 = 3906 DOT (point).

10. The angle of view of the LED screen depends on the LED lamp beads selected：

（1）Such as indoor surface stickers: SMD0603/0805: H: 160 degrees V: 120 degrees;
SMD3528 viewing angle: H: 140 degrees V: 120 degrees;
Outdoor plug light DIP: dip346/546 : H: 110 degrees V: 50 degrees;
Red color: 625-630nm;
Yellow green: 568-572nm;
Pure green: 520-530nm;
Blue: 460-470nm;
Yellow: 585-590nm.
The same usual brightness requirements are as follows:
(1) Indoor: >800CD/M2;
(2) (2) semi-indoor: >2000CD/M2;
(3) (3) Outdoor (sitting south to the north): >4000CD/M2;
(4) (4) Outdoor (sitting north facing south): >8000CD/M2.

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