Basic knowledge of LED screen
Author:Zhao Daibing Time:2021-06-07 15:47 Browse(456)
1. LED brightness
1. LED brightnessThe brightness of light-emitting diodes is generally expressed by luminous intensity, and the unit is candela CD; 1000ucd (micro candela)=1 MCD (millicandela), 1000mcd=1 CD.

Basic knowledge of LED screen

the light intensity of a single LED for indoor use is generally 500ucd-50 MCD.
while the light intensity of a single LED for outdoor use is generally 100 mcd-1000 MCD, or even more than 1000 MCD2. LED pixel moduleThe LEDs are arranged in a matrix or pen segment.
prefabricated into standard size modules.
indoor display screen commonly includes 8 * 8 pixel module, 8 character 7 segment digital module.
outdoor display screen pixel module has 4 * 4, 8 * 8, 8 * 16 pixel specifications.
outdoor display screen pixel module is also called bundle module because each pixel is composed of more than two LED bundles.
so it is also called bundle module. pixel diameter ∮ refers to the diameter of each pixel.
the unit is mm.
the pixel diameter ∮ refers to the diameter of each pixelFor indoor display screen,
generally, a single LED has a circular shape.
the common pixel diameter calibration methods for indoor display screen are ∮ 3.0, ∮ 3.75, ∮ 5.0, ∮ 8.0, etc.
among them, ∮ 3.75 and ∮ 5.0 are the most.
the pixel diameter calibration method for indoor display screen is simple, simple and accurateIn outdoor environment.
in order to improve brightness and increase sight distance, a pixel contains more than two cluster LEDs; Because more than two cluster LEDs are not circular in general, the pixel diameter of outdoor display screen is generally expressed by the average distance between two pixels:? 10,? 11.5,? 16,? 22,? 25.
the pixel diameter of outdoor display screen is generally expressed by the average distance between two pixels4. Point spacing, pixel density and information capacityThe center distance or dot pitch between two pixels of LED display screen; The number of pixels per unit area is called pixel density; The amount of display content per unit area is called information capacity.
the essence of the three is to describe the same concept: the distance between two pixels reflects the pixel density.
the distance between two pixels and the pixel density are the physical properties of the display screen; Information capacity is the quantitative unit of information carrying capacity of pixel densityThe smaller the distance between points.
the higher the pixel density, the more the information capacity, and the closer the distance suitable for viewing.
the smaller the distance between pointsThe larger the distance between points.
the lower the pixel density is, the less the information capacity is, and the farther the distance suitable for viewing is.
the larger the distance between points is5. ResolutionThe number of rows and columns of pixels in LED display screen is called the resolution of LED display screen.
resolution is the total number of pixels in the display screen.
it determines the information capacity of a display screen6. LED panelThe LED pixel modules are assembled and arranged into a matrix according to the actual needs.
a LED display screen is composed of a special display driver circuit, DC regulated power supply, software, frame and external decoration7. GrayscaleGrayscale refers to the degree of change in the brightness of a pixel.
the grayscale of a primary color generally has 8 levels to 1024 levels.
for example,
if the grayscale of each primary color is 256 levels, for a dual primary color screen, the display color is 256 × 256=64K color, which is also called 256 color display8. Two primary colorsNowadays, most color LED displays are dual primary color screens.
that is to say, each pixel has two LED chips: one is the red LED chip, the other is the red LED chip,One is the green light tube core.
when the red light tube core is bright, the pixel is red.
when the green light tube core is bright, the pixel is green, and when the red and green tube cores are bright at the same time, the pixel is yellow.
among them, red.
green is called the primary color.
when the red light tube core is bright, the pixel is green9. Full colorRed and green double primary colors plus blue primary colors constitute full color.
due to the mature technology of blue tube and pure green tube core, full color is basically used in the market.
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