How many CD per square meter does the light intensity of outdoor single color (red) led display need to reach in direct sunlight environment?
Author:Wen Zhida Time:2021-09-27 10:14 Browse(967)
The brightness of the display screen can be directly measured by the instrument or calculated by the theoretical algorithm. If the instrument is used for measurement, the name of the instrument is called brightness tester, as the saying goes, "light gun". I'm using BM-7 now. If you want to use the display screen directly to the sun, in theory, the brightness of your display screen should reach about 2000cd / m2 (full-color, 8000CD / m2, because the brightness ratio of red, green and blue is 3:6:1, so red needs about 2400cd / m2). However, it is not recommended to install the display screen directly to the sun, which is unscientific.
The brightness of the display screen can be directly measured by the instrument or calculated by theoretical algorithm.

How many CD per square meter does the light intensity of outdoor single color (red) led display need to reach in direct sunlight environment?

if measured by the instrument.
the name of the instrument is brightness tester, It's called "light gun" as the saying goes.
what I use now is BM-7.
if you want to use the display screen directly to the sun.
in theory, the brightness of your display screen should reach about 2000cd / m2 (8000CD / m2 for full color, because the brightness ratio of red, green and blue is 3:6:1, so the red color needs about 2400cd / m2), but it is not recommended to install the display screen directly to the sun, That's unscientific.

if you want to calculate the brightness of your display screen by calculation.
first, you have to know the distance between points of your display screen. Second, you need to know the brightness parameters of the lights on the display screen.
suppose the distance between points is XMM.
the brightness of a single red light is y MCD (y * 0.001cd), Then the specific algorithm is as follows.

the number of lights per square is (1000 / x) * (1000 / x)
then multiply the number of lights per square by the brightness of a single light.
that is, (1000 / x) * (1000 / x) * y * 0.001.

the result is the brightness value of a square.
(this is the algorithm in the static formula)
but the driving mode of the monochromatic screen is not necessarily static
Generally, it's scan driven (1 / 4 scan or 1 / 8 scan), so the brightness of monochrome display screen is not as high as you said in the title, and it's very good to be able to reach 1500.
generally, the monochrome display screen can reach 800cd per square meter.
it's impossible to reach 3500. Of course, the higher the brightness, the better.
the cost will increase, That is to say, you can choose the light with higher brightness when selecting the light.
but at present, the red brightness of the display screen is a bottleneck.
the brightness can not be too high.
ordinary single light is usually 450mcd.
the high light is about 1000mcd.

according to your calculation, it is 4500cd.
multiply 0.001 means to convert MCD into CD, since you have already multiplied, So the unit is CD.
I told you later.
this algorithm is only suitable for static driving mode. Generally speaking, monochrome screen will not be static, and most of them do 1 / 4 scanning, 1 / 8 scanning, etc.
(I don't know if you understand the principle of 1 / 4 scanning.
in a simple way, only one light is on in four lights in the same unit time, until the next unit time, Another light is on, and the other three lights are not on... Of course, it is constantly scanning among the four lights at a very fast speed, so fast that our eyes can't distinguish it. In fact, it is constantly scanning.
) that is to say, there is no doubt that the brightness is only 1 / 4 of the static brightness, Because the distribution of the brightness of a lamp is uneven when the current changes.
so for the scanning driving mode of the display screen.
we can only calculate an approximate value.

in addition.
generally speaking, the red light is 450mcd. In fact, is the brightness really that high? I know that's what the specification says, but if I really test it, I'm sure that the lamp is not as bright as this.
.
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