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Performance characteristics of LED display

From: Data:31/08/2016

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1, LED display color

monochrome display: from the display effect, general monochrome display only single red or yellow. Monochrome display is generally used to play simple text. Such as securities companies or banks and other institutions with more.

: dual color display is generally used in red and green two colors. 256 gray, you can display 65536 colors. Used to play text, simple pictures, etc.. General stations and other places more common.
full-color display: three primary colors of red, green and blue, 256 level grayscale full-color screen can display more than 16 million kinds of colors. Play text, pictures, video, etc.. Generally used in commercial advertising, stage performances, etc..
2, pixel and resolution of the
component of the smallest unit, we call the pixel. For example, a single red screen, one of which is a red light, we call it a pixel. If a pixel full-color display, it is composed of a white point minimum (1R1G1B).
and the resolution of a display screen is the number of pixels. As usual computer monitors, the general resolution of 1024*768. The LED display is also a technical parameter.
general picture and text screen to display the proportion of the length and width of the screen is not required. If it is a video screen, the length of the display screen is generally 4:3 or 16:9, so that the effect is the best.
in addition, customers on the use of LED lights will be required. LED lights sub - plug - in lights, patch lights, as well as sub - table lamp. Generally do outdoor screen with LED plug-in, for indoor use patch, but nor shall such a generalization, many outdoor display screen is still used in sub surface mount LED, with sub surface mount LED convenient glue to achieve waterproof. Specific or to see customer requirements.
3, point spacing
a display adjacent to the distance between the two pixels is called the point spacing. The general name is PX. The smaller the distance between the screen, the better the effect of playing, the more clear image, the higher the technology content.
addition, the distance between the dot and the display screen has a direct relationship. Generally PX screen, it's best to watch the distance is X/2 meters outside. For example, P10 display, the effect will be more good to watch 5 meters.

in the beginning of display, because most of them are using dot matrix module to display, so call to point spacing is Phi x, phi is representative of the diameter of a pixel, such as Phi 3, Phi 5 and so on, but is now generally do not use this, because of the use of dot matrix module to produce display has been slowly fade out of the market.
4, display use occasions
LED display indoor, semi outdoor, outdoor three kinds of use of the premises.
indoor display brightness to achieve more than 800CD/M2. Semi outdoor display brightness to reach more than 2000 CD/M2.

outdoor display screen brightness to be reached more than 4000 CD/M2 (northward), and over 8000 CD/M2 above sit the Northern Dynasties South). CD is a brightness unit, called Candela. 1CD=1000MCD, generally a common LED lamp brightness is several hundred to several thousand MCD. CD/M2
is the unit area of the brightness value, is dedicated to the display of a brightness computing unit.

ordinary lighting products are used in the brightness of the unit is LM (Liu Ming) or LM/W.
also display screen relates to a white balance, that is red, green, blue three colors in the same gray level are needed to reach the white balance. Generally when debugging we take the RGB luminance ratio: 3:6:1.
indoor LED display and outdoor LED display is very different. First is different brightness indoor screen brightness to than households outer lower several times to several times; the indoor display screen placed in outdoor like the TV set in the outdoor as brightness is not enough, therefore, outdoor screen must be the use of ultra high brightness LED and in order to further increase the brightness and increase visual distance, in a pixel tend to package multiple super high brightness LED. Secondly outdoor screen on the environment adaptability to much higher than indoor screen, outdoor screen, beware of the water (rain), anti sunlight, dust-proof, anti high temperature, wind, anti lightning, and indoor screen without consideration of these issues. One of the important parameters of
LED display color is color temperature. The color of the blackbody light source that emits light at a temperature of radiation light is the same, the temperature of the blackbody is called the light source color temperature. In the development sample, we need to debug the display, the color temperature should have a corresponding standard, it is and brightness together with the debugging.
color temperature is greater than 5000K, the display gives a cool feeling, this white with blue.
color temperature in the range of 3300-5000K, the display gives people a refreshing feeling, this is pure white.
color temperature is less than 3300K, the display gives people a warm feeling, this white with red.
the three like a house is the same, if outside the glass enclosure, reflected the sky blue, then give people the feeling is cool, if it is outside the sunless and inside with red lighting lamps and lanterns, feel is warmer.
general customers are not required to make, we generally are will to display color temperature adjustment in between 3300-5000K.
6, drive mode
static: static display high brightness, suitable for outdoor. Its control mode is a single pixel of a single color (usually a LED) power supply. So that each pixel has enough drive current, the brightness is correspondingly higher. 1/2
scan: under the same conditions, the 1/2 scanning display brightness is lower than the static, suitable for outdoor and semi outdoor. Its control mode is equivalent to the current supply of a single light supply at the same time the supply of two LED lights. So it will be reduced in brightness. Of course also supply two LED lamp current is not the average current distribution, but current constantly between the two LED scanning, the scanning frequency up to 100 times per second. That is to say current in the 1 /100 seconds for one LED, in a 1 /100 seconds is to provide another led. In fact, the two LED is in the continuous bright lights, but the persistence of vision effect let us unaware they in the continuous bright lights, as long as the scanning frequency reached more than 64 times per second, the human eye is resolved.
1 /4 scan: in the other conditions are the same, 1 /4 scan display only 1 /2 scanning display half brightness for semi outdoor and indoor. The control method is to increase from two 1/2 LED to 4 LED. Current scanning between 4 LED.
1/8 scan, 1/16 scan: these belong to a lower luminance driving mode, generally only used indoors. They are controlled by the same analogy.

7, and
as the virtual reality and virtual pixel screen screen is corresponding to the. In simple terms, like screen refers to constitute a display of red, green and blue three kinds of luminous tube of each luminous tube will only participate in a pixel imaging using, in order to obtain enough brightness.

virtual screen is using software algorithm control of each color luminous tube eventually participate in the imaging of a plurality of adjacent pixels, so that the larger resolution with less lamp, can make the display resolution is increased about four times.
gray gray is refers to the pixel emission changes in light and shade, a gray color generally have a grade 8 to 256. For example, the full color LED display in the case of 256 gray level changes, the color can be displayed on the kind of color is 256*256*256=16777216. So the 256 gray level of the display color is more rich, the image is more delicate.

control card in general according to customer requirements or display to achieve the effect, the choice of the type and quantity of control card is also different. First, we must understand that the customer is required to control the use of synchronous or offline. Second, but also to understand the customer with what transmission mode on the LED display communications. Third, the customer to the LED display, the size of the area.
general synchronization control card is divided into the send and receive cards, send cards generally support 1024*768, which is the maximum display area of a computer display. While receiving card for full-color 4096 level (4K) gray 180hz refresh rate, maximum with 512 x 128, full-color static 16384 level (16K) gray 300Hz, with 160 x 64. (Note: the need to drive to board on high clock 30MHz).
from the sending card to the receiving card is a cable for signal transmission, it's reliable transmission distance is 140 meters.
because of the needs of the market, more and more control cards came into being, such as wireless receiving control card, read USB control card and so on, due to the different needs of customers and different.
10, IP IP level
is international used to identify the protective level of code IP level by two numbers, the first digit said dustproof; a second digital by the said waterproof, the larger the number said the door head is better.
generally have this requirement for the outdoor display.
0 without protection without special protection to prevent
1 more than 50mm objects to prevent the intrusion body due to internal parts to prevent accidentally touched the lamp diameter of more than 50mm objects into
2 to prevent more than 12mm objects to prevent the intrusion of
3 fingers inside the lamp parts to prevent more than 2.5mm of full diameter larger than 2.5mm intrusion prevention tools wire or object invasion
4 more than 1.0mm objects to prevent intrusion prevention the diameter of more than 1 mosquitoes, insects or objects into the
5 dust can not completely prevent dust intrusion, but the intrusion of dust will not affect the normal operation of the lamp quantity
6 dust completely prevent dust intrusion

0 has no protection or special protection 1 drips drops of water to prevent the intrusion of vertical
2 tilt 15 degrees still prevent dripping invasion when the lamp is tilted 15 degrees, can prevent water
3 spray preventing water intrusion prevent rain, or in the vertical angle less than 50 degrees in the direction of the water jet
4 to prevent the splash of water to prevent the intrusion of each direction splash to prevent water intrusion
5 waves of water waves or water spray holes to prevent the intrusion from rapid water intrusion

6 to prevent water intrusion into the water waves lamps in a certain period of time or pressure conditions, can ensure the normal operation of the lamp
7 to prevent the intrusion of water ingress of water lamps indefinitely submerged in a certain