First, the calculation method of the display size
1. The way the indoor display is calculated.
(1) Give the specific data of the screen (length, width, area)
a. Example: The specification of the screen is Φ5 (refer to the diameter of the pixel) screen, the screen length is 5.8 meters, and the width is 2.6 meters.
b. First, it is clear that the specification of the Φ5 screen is 488×244mm, and the resolution of the unit board is 64×32.
c. Calculate the number of blocks in the cell board used.
Number of boards used for screen length or width = number of boards used for pre-screen length or wide unit length or wide screen length: 5.8 m × 1000 ÷ =1 =1 =1 =1 =1
Number of boards for screen width: 2.6 m × 1000 ÷ 244 = 10.65 ≈ 11
d. Calculate the actual screen size.
The actual screen length or width is = the length or width of the unit board × the length of the screen or the number of blocks used for the actual screen length: 488 × 12 = 5856mm that is 5.856 meters actual screen width: 244 × 11 = 2684mm that is 2.684 meters e. Area: 5.856 × 2.684 = 15.72 (m2)
Note: Generally, the outer frame size of the clear screen is 5-10cm on each side of the screen size.
f. Screen resolution = number of screens used for the screen × resolution of the panel of the unit board = (12 × 64) × (11 × 32)
(2) Only the area of ​​the screen is given, and there is no length or width.
a. Example: Make a screen with an area of ​​9m2. The screen size is Φ5 (refers to the diameter of the pixel).
b. If only the area is given, we must calculate the length and width. It can be calculated in the ratio of length to width and width of 4:3 or 16:9. This picture works well. (here 4:3 as an example)
c. The theoretical screen length is: long = (area ÷ 12) square root × 4
Width = (area ÷ 12) square root × 3 ie: length = 3.46m width = 2.60m
d. The length and width have been found. The calculations below can be found in the example in (1).
2. How the outdoor display is calculated.
(1) Give the specific data (length, width, area) of the screen.
a. Example: The outdoor full color screen to be P20 is about 10 meters long and about 6 meters wide. First of all, the specification of the unit box (the length and width of the box) is 1280×960mm, and the resolution is 64×48.
c. Calculate the number of cabinets.
Number of boxes used for screen length or width = number of cabinets for long or wide screen lengths of pre-screen length or width unit: 10 m × 1000 ÷ 1280 = 7.8123 ≈ 8
Number of cabinets for screen width: 6 m × 1000 ÷ 960 = 6.25 ≈ 6
d. Calculate the actual screen size.
Actual screen length or width = box size (size) length or width × screen length or width of the number of cabinets Actual screen length: 1280 × 8 = 10240mm that is 10.24 meters actual screen width: 960 × 6 = 5760mm ie 5.76 Meter e. Screen area: 10.24 × 5.76 = 158.9824 ≈ 158.98 (m2)
f. Screen resolution = resolution of the cabinet length and width × length and width of the box = (64 × 8) × (48 × 6)
(2) Only the area of ​​the screen is given, and there is no length or width.
a. Example: If you make a P20 outdoor full color screen area is about 50 square meters.
b. If only the area is given, we must calculate the length and width. It can be calculated in the ratio of length to width and width of 4:3 or 16:9. This picture works well. (here 4:3 as an example)
c. The theoretical screen length is: length = (area ÷ 12) square root × 4 width = (area ÷ 12) square root × 3 ie: length = 8.16m width = 6.12m
d. The approximate length and width have been found, and the next calculation is as in Reference Example (1).
Second, the brightness calculation method of the display
Take the full color screen as an example. Usually, the red, green, blue and white balance ratio is 3:6:1.
Red LED light brightness: brightness (CD) / M2 ÷ points / M2 × 0.3 (white balance ratio accounted for 30%) ÷ 2
Green LED brightness: brightness (CD) / M2 ÷ points / M2 × 0.6 (white balance ratio accounted for 60%)
Blue LED brightness: brightness (CD) / M2 ÷ points / M2 × 0.1 (white balance ratio accounted for 10%)
(1) It is known that the brightness of the whole screen is the brightness of a single tube.
For example: 2500 points per square meter, 2R1G1B, and the required brightness per square meter is 5000 cd/m2, then:
The brightness of the red LED is: 5000÷2500×0.3÷2=0.3cd=300mcd
The brightness of the green LED is: 5000÷2500×0.6=1.2cd=1200mcd
The brightness of the blue LED light is: 5000÷2500×0.1=0.2cd=200mcd
The brightness per pixel is: 0.3×2+1.2+0.2=2.0 cd=2000mcd
(2) It is known that the brightness of the whole screen is the brightness of the single tube.
For example: take P31.25, Nichia tube as an example.
HSM display main die specifications red green HSM-PH-A+ (Japan) 180-440mcd 1020-2400 mcd
Because the white balance is matched with the brightness red: green: blue = 3:6:1; and the ratio of white balance is matched with other tubes with the brightness of the green tube. So as follows:
From red: green = 3:6 It can be seen that the brightness of the green tube is twice that of the red tube, that is, the brightness of the red tube is: 2400 (blue) ÷ 2 = 1200mcd and because of the red, green and blue tubes, the red tube has 2 Therefore, the brightness of a single red tube is: 1200 ÷ 2 = 600 mcd.
From green: blue = 6:1, the brightness of the green tube is 6 times that of the blue tube, that is, the brightness of the blue tube is: 2400 (blue) ÷ 6 = 400mcd, 1 illuminating pixel = 2 red tube +1 green tube +1 Blue tube
That is, the brightness of one pixel = 600 (red) × 2 + 2400 (green) + 400 (blue) = 3400mcd = 3.4cd
Brightness per square meter = 1 brightness of illuminating pixels × pixel density per square meter (number) = 3.4 cd × 1024 (number of pixels) = 3482 cd. Calculated by 20% of the light loss, the actual luminous brightness should be: 2782.28cd.
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