There
are many kinds of LED display screen, mainly it could be divided in four
ways: one is classified according to indoor and outdoor, two is
classified according to work mode, three is classified according to
the number of color, and four is according to the unit density of LED
tube. Different types of displays have different uses, each has its
own advantages and disadvantages. It can be chosen according to
needs.
The
indoor LED display is quite different from the outdoor LED display.
First, the brightness is different. The luminance of the indoor
screen is several times to dozens times lower than that of the
outdoor screen. It is not bright enough to put the indoor display
screen to the outdoor as if putting the TV set to the outdoor.
Therefore, the outdoor screen must use the ultra high brightness LED,
and in order to further improve the brightness and increase the
visual distance, a number of super high brightness LED are often
encapsulated in a pixel. Besides, outdoor screen need to be
waterproof, anti direct sunshine, dustproof, high temperature and
wind protection, anti thunder and so on, while the indoor screen is
no need to consider these problems.
1.
online and offline display screen
LED
displays are divided into two categories according to work mode, one
is online, also called omnipotent display, the other is off line,
also called intelligent display screen. The international standard
8X8LED matrix module is used for both the online and offline display
screen. The surface of the screen is the same, the basic display
function is the same, the main difference between the two is:
(1)
the off-line display screen does not need to connect the
microcomputer at ordinary times. The display screen has a built-in
microcomputer. It can save a lot of pictures and can run out of the
microcomputer independently. There are some clock chips in some
screens, and could automatically be connected and show the calendar
and clock. When we need to modify the display content, we can modify
it through RS232 to connect the microcomputer. The connected display
is connected to a microcomputer to work.
(2)
The display mode of the off-line display screen is less. There are
several display modes, such as pop-up, pull up, pull down, upward
movement, and downward movement. The online display has more display
ways, especially if the program is made with 3DS and other software,
the display mode has no limit.
(3)
off-line display is easy to operate. It's just as simple and
convenient as duty light. As it does not need to connect the
microcomputer, a process is reduced, and the possibility of failure
is reduced. The online display screen needs to be maintained,
especially if the animation program is to be made.
2.
monochrome and color display screens
(1)
The single color display screen uses standard part of standard 8X8
monochrome light emitting diode matrix module, each pixel can be red
or green, can display various text, data, two dimensional graphics.
The indoor single color screen is economical and practical, but the
color is slightly single.
(2)
The color display screen uses the standard 8X8 dual color light
emitting diode matrix module (the module size is the same as before),
each pixel has a red light, one green light emitting diode and two
light emitting diodes. When red and green two light-emitting diodes
are emitting at the same time, they are yellow. So the double base
color can produce three colors: red, yellow and green. The double
base color screen is colorful and can be used to display various
color characters, data, graphics, animation and so on. In addition,
it can also be connected with various data devices. It shows
real-time dynamic data and advertisement. The indoor color display is
bright, with distinct visual effect and better information display
effectiveness.
(3)
The color gray scale display uses the standard 8X8 double plexus
light emitting diode matrix module (the module size is the same as
before), each pixel has red, yellow, green color, each base color has
16X16 level gray =256 or 256X256 gradation =64K color and even more
color. Color gray scale is rich in gray level and expressive. In
addition to the same display effect as color display, color grayscale
display can also display more colorful contents such as photos,
images, 3D graphics, animation and video images. The expressive force
is more delicate and full, the visual effect is more realistic and
moving. Color gray display screen is also called color video display.
