On the purchase of LED display, many customers do not know how to buy cost-effective products, there are many users on the Internet to collect information about this aspect, but always failed to get a satisfactory answer. What are the factors that should be considered when buying a display?
The first point: You need to know the length and width ratio of the general screen
1, graphic screen: according to the content of the show;
2, video screen: generally 4:3 or close to 4:3; ideal ratio is 16:9.
Second: What are the factors that should be taken into account in the size design of the screen?
1, display the content of the need;
2, site space conditions;
3, display unit, template size (indoor screen) or pixel size (Hu Waiping).
Third: You need to know the points that the control system can control
Communication screen A card: monochrome, two-color 1024 * 64
Communication screen B card: monochrome: 896 * 512 double color: 896 * 256
DVI dual color screen: 1280 * 768
DVI full color: 1024 * 512
Fourth: Need to understand the display power consumption indicators and power requirements?
The power consumption of the display screen is divided into average power consumption and maximum power consumption. The average power consumption is also called work capacity, which is the actual power consumption at ordinary times. The maximum power consumption is the power consumption in the extreme situations such as starting or full lighting, and the maximum power consumption is an essential factor for AC power supply (wire diameter, switch, etc.). The average power consumption is usually 1/3 of the maximum power consumption. The display screen is a large precision electronic equipment. In order to work safely and reliably, the AC220V power input or the AC220V input terminal of the computer connected to it must be grounded.
The fifth point: The need to understand what a full color patch and indoor full color module?
The 1 part: full color luminous module, display module is generally yellow green, pure green module price is more expensive; SMD full color commonly used pure green tube core;
2, the display module: full color pixel visual feeling is thick, low brightness, easy to have the mosaic phenomenon; SMD full color consistency, high brightness;
3, full-color module maintenance: maintenance is not easy, the whole module replacement cost is high; and the whole patch to maintain, and can be a single lamp replacement;
The sixth point: Why is the production cycle of outdoor screen longer?
1, raw materials procurement: LED lamp purchasing cycle is longer, especially imported core, the order cycle needs 4 – 6 weeks;
2, the production process is complex: need to pass PCB design, shell production, filling glue, white balance, etc.;
3, the structure requirements are strict: generally for box design, need to consider wind, rain, lightning protection, etc..
The seventh point: What factors need to consider the allowable size of the screen area?
1. The relation between effective sight distance and actual site size;
2, pixel size and resolution;
3, the element is the area estimation of the cardinal number;
4, the screen body mechanical installation and maintenance of operating space;
5, the influence of screen tilt angle on distance;
The eighth point: You need to know the brightness of the environment, what are the brightness requirements for the screen?
General brightness requirements are as follows:
1, indoor: >800CD/M2
2 and semi indoor: >2000CD/M2
3, outdoor (North): >4000CD/M2
4, outdoor (South): >8000CD/M2
How do we calculate the brightness of LED lights in the light of the requirements of the brightness and the point density?
The calculation method is as follows: (take two red, one green and one blue as an example)
Red LED lamp brightness: brightness (CD) /M2 / /M2 x 0.3 / 2 points
Green LED lamp brightness: brightness (CD) /M2 / /M2 * 0.6 points
Blue LED lamp brightness: brightness (CD) /M2 / /M2 * 0.1 points
For example: 2500 points per square meter density, 2R1G1B, per square meter brightness requirement is 5000CD/M2, then:
Red LED lamp brightness is: 5000 / 2500 x 0.3 / 2=0.3
Green LED lamp brightness is: 5000 / 2500 x 0.6=1.2
Blue LED lamp brightness is: 5000 / 2500 x 0.1=0.2
The brightness of each pixel is 0.3 * 2+1.2+0.2=2.0CD
The ninth point: What kind of effect should be considered?
1, text display: depending on the size of the text and resolution requirements;
2, ordinary video display: 320 * 240 dot matrix;
3, the standard of digital DVD display: 640 * 480 dot matrix;
4, complete computer video: 800 * 600 dot matrix;
Tenth: Need to know the design and installation of outdoor display?
1, the screen body and the construction of the joint must be strictly waterproof, leak proof; screen body should have good drainage measures, once the water can discharge smoothly;
2. Install lightning protection devices on display screens and buildings. The main body of the display screen is well grounded and the grounding resistance is less than 3 ohms, so that the high current caused by lightning is released in time;
3, install ventilation equipment to cool down, so that the temperature inside the screen is between -10 and 40 degrees centigrade. An axial fan is installed behind the screen to discharge heat;
4. Select industrial integrated circuit chips with working temperature between -40 and 80 degrees centigrade to prevent the winter temperature from too low and make the display screen unable to start. ;
5, in order to ensure a strong light in the environment of long-distance vision, you must choose ultra high brightness led;
6, display media selection of new wide view tube, wide viewing angle, pure color, consistent coordination, life expectancy of more than 100 thousand hours. Display package media is currently the most popular cover band along the square cylinder, silica gel seal, with no metal assembly; the appearance of fine appearance, durable, anti sunlight, dustproof, waterproof, anti high temperature, anti short circuit five prevention “.
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