First, LED life
According to the technical data issued by LED material manufacturers, the service life of LED luminous body is 1 O ten thousand hours in an ideal state. The ideal state refers to the time from luminescence to non-luminescence in the laboratory under the condition of constant pressure and constant current. 1 O ten thousand hours is equivalent to 1 1 year.
The amount of a bucket of water is determined by the bottom board, and the service life of the civilian-grade devices currently used in LED display screen is no more than 8 years. As a display screen, its function is to watch. When the display screen is on, it can only be seen clearly at night, and it can't be said to be qualified and valuable.
A car can run for 15 years, and it will be scrapped after being idle for 3 years. The environment and methods used have great influence on the life of products.
Second, it conforms to national standards.
The general specification of LED display screen is the ministerial standard of 1995. Up to now, many companies claim to meet the national standards. If we look at the standards at that time after eight years of scientific and technological development, it is no longer a standard. For example, the number of out-of-control points in national standards is three ten thousandths. Take φ3.75 indoor two-color display as an example. It is 44320 points per square meter, and there can be 12 out-of-control points according to the national standard. Who will pay for such a display today?
Third, the software is free.
There is a common problem among enterprises in the display industry in China ―― only producing but not researching and developing. At present, only a few enterprises have their own first control system.
Fourth, cost performance.
It depends on the cost performance. It depends on the cost performance, not just the price.
Verb (abbreviation for verb) gray scale
As a two-color and full-color display screen, gray scale is an important indicator. At present, the market is full of many display screens with16,64 gray level posing as 256 gray level. Its control cost is only 1 of 256 gray level control.
Six, buy the best
If you want to buy, you need the best. All purchasing power comes from need. Meet the demand and have a certain lead. Blind pursuit will waste a lot of money to buy functions that you don't need. Of course, you can't buy it too cheaply, you must choose according to your own needs.
Seven. reality
Application is the foundation. As a consultation in application, software upgrade, hardware maintenance and maintenance are inseparable from the support of manufacturers.
Note 2
1. Size design of display screen
There are three important factors in screen size design:
(1) The need to display the content;
(2) the space conditions of the site;
(3) Template size or pixel size of display screen unit (indoor screen) (outdoor screen).
2. Power consumption and power supply requirements
The power consumption of display screen is divided into average power consumption and maximum power consumption. The average power consumption is also called working power consumption, which is the actual power consumption at ordinary times. The maximum power consumption is the power consumption under extreme conditions such as starting or all-light, and the maximum power consumption is the factor that AC power supply must consider (wire diameter, switch, etc. ). The average power consumption is generally 65438+ 0/3 of the maximum power consumption.
Display screen belongs to large precision electronic equipment. For safe use and reliable work, its AC220V power input or the AC220V power input of the computer connected to it must be grounded.
Note: the AC220V power input grounding terminal of the computer has been connected to the computer chassis.
3. Outdoor screens should be considered.
The main problems of outdoor screen are as follows:
(1) The display screen is installed outdoors, often exposed to the sun and rain, and the dust cover is blown by the wind, resulting in a harsh working environment. Wet or severely damp electronic equipment will cause short circuit or even fire, leading to failure or even fire, resulting in losses;
(2) The display screen may be attacked by strong electricity and strong magnetism caused by lightning;
(3) The ambient temperature changes greatly. When the display screen works, it will generate some heat. If the ambient temperature is too high and the heat dissipation is poor, the integrated circuit may work abnormally or even be burned, thus making the display system unable to work normally.
In view of the above special requirements, the outdoor display screen must:
(1) The screen body and the joint between the screen body and the building must be strictly waterproof and leak-proof; Screen body should have good drainage measures, once there is water, it can be discharged smoothly;
(2) Install lightning protection devices on display screens and buildings. The main body and shell of the display screen are well grounded, and the grounding resistance is less than 3 ohms, so that the heavy current caused by lightning can be discharged in time;
(3) Install ventilation equipment to cool down, so that the internal temperature of the screen body is between-10℃ ~ 40℃. An axial fan is installed above the back of the screen body to dissipate heat; www.520led.com
(4) Choose an industrial-grade integrated circuit chip whose working temperature is -40℃~ 80℃ to prevent the display screen from starting due to too low temperature in winter. ;
(5) In order to ensure long-distance visibility under strong ambient light, ultra-high brightness light-emitting diodes must be selected;
(6) The display medium is a new type of wide viewing angle tube, with wide viewing angle, pure color and harmony, and its service life is over 654.38+ million hours. The outer packaging of display media is the most popular square tube with edge wrapping, which is sealed with silica gel and has no metallized components. Exquisite and beautiful appearance, strong and durable, with the characteristics of preventing direct sunlight, dust, water, high temperature and short circuit.
4. How to help users choose the right display screen?
(1) The need to display the content;
(2) Determination of sight distance and visual angle;
(3) Requirements for screen resolution;
(4) Requirements of installation environment;
(5) cost control;
5. What is the general aspect ratio of the display screen?
Graphical screen: determined according to the display content;
Video screen: generally 4: 3 or close to 4: 3; The ideal ratio is 16: 9.
6. How many points can a control system control?
Communication screen A card: monochrome and bicolor 1024×64
Card B of communication screen: monochrome: 896×5 12 and bicolor: 896×256.
DVI two-color screen: 1280×768
DVI full-color screen: 1024×5 12
7. Installation requirements of display screen? www.520led.com
Power requirements: the power connection point should be within the screen size.
220V mains supply, live wire 0 ground wire;
380V mains power supply, three-wire and one-wire grounding wire;
The cross-sectional areas of live conductor and neutral conductor are the same;
The display screen above 10 kW shall be equipped with step-down starting equipment.
Communication requirements: the communication distance is determined by the length of the communication line.
Install the communication line according to the communication line length standard for the installed display model.
Communication lines are not allowed to run in the same conduit as power lines.
Installation requirements: the display screen is installed horizontally, and it is not allowed to lean backwards.
Lifting should be equipped with an up-and-down adjusting lever.
Before wall-hanging installation, install a hook that falls off forward.
Landing installation should add positioning support bolts.