On the purchase of LED display, many customers do not know how to buy cost-effective products, there are many users in the online collection of inquiries on this information, but always not satisfied with the answer. Then buy the screen in the end should be considered what factors?
The first point: need to understand the general display of the aspect ratio is how much?
1, graphic screen: according to the contents of the show to determine;
2, video screen: generally 4: 3 or close to 4: 3; ideal ratio of 16: 9.
The second point: the size of the display design generally consider what factors?
1, show the needs of the content;
2, site space conditions;
3, the display unit template size (indoor screen) or pixel size (outdoor screen).
The third point: need to understand the control system to control the number of points?
Communication screen A card: monochrome, two-color 1024 × 64
Communication screen B card: Monochrome: 896 × 512 Two colors: 896 × 256
DVI color screen: 1280 × 768
DVI full color screen: 1024 × 512
The fourth point: need to understand the display power consumption and power requirements of what?
The power consumption of the display is divided into average power consumption and maximum power consumption. The average power consumption, also known as the work of electricity, is usually the actual power consumption. The maximum power consumption is the power consumption at the time of start-up or full-light, and the maximum power consumption is the element that AC power supply (wire diameter, switch, etc.) must consider. The average power consumption is generally the maximum power consumption of 1/3. The display is a large-scale precision electronic equipment, for safe use and reliable work, the AC220V power input or connected to the computer AC220V power input must be grounded.
The fifth point: need to understand the indoor module full color and patch full color difference between what?
1, light part: the module full color display module is generally yellow and green, pure green module price more expensive; patch full color screen generally use pure green die;
2, display: the module full color pixel visual sense of thick, low brightness, easy to have mosaic phenomenon; patch full color screen consistency is better, higher brightness;
3, maintenance: module full color is not easy to maintain, the whole block replacement cost is higher; and patch full color easy to maintain, and can be a single lamp repair replacement;
Sixth point: why is the outdoor screen production cycle longer?
1, raw material procurement: LED lamp procurement cycle is longer, especially imported die, the order cycle to be 4-6 weeks;
2, the production process is complex: need to go through the PCB design, shell production, filling, white balance, and so on;
3, the structure of strict requirements: the general design for the box, need to consider wind, rain, lightning and so on.
Seventh point: need to consider the site can allow the screen area of the factors which?
1, the relationship between the effective line of sight and the actual size of the site;
2, pixel size and resolution;
3, the unit is estimated by the area of the base;
4, screen body mechanical installation and maintenance operation space;
5, the impact of the screen body on the distance;
Eighth point: need to understand the ambient brightness for the screen body which brightness requirements?
General brightness requirements are as follows:
1, indoor:> 800CD / M2
2, semi-indoor:> 2000CD / M2
3, outdoors (sitting north and south):> 4000CD / M2
4, outdoors (sitting south):> 8000CD / M2
In the clear brightness and density requirements of the conditions, how to calculate the brightness of LED lights?
Calculated as follows: (to two red, a green, a blue example)
Red LED light brightness: brightness (CD) / M2 ÷ points / M200.3 ÷ 2
Green LED light brightness: brightness (CD) / M2 ÷ points / M20.6.6
Blue LED light brightness: brightness (CD) / M2 ÷ points / M2 × 0.1
For example: 2500 points per square meter density, 2R1G1B, brightness requirements per square meter 5000CD / M2, then:
Red LED lights brightness: 5000 ÷ 2500 × 0.3 ÷ 2 = 0.3
Green LED lights brightness: 5000 ÷ 2500 × 0.6 = 1.2
Blue LED lights brightness: 5000 ÷ 2500 × 0.1 = 0.2
The brightness of each pixel is: 0.3 × 2 + 1.2 + 0.2 = 2.0CD
Ninth: need to consider what the effect of playing?
1, text display: depending on the size of their text and resolution requirements;
2, ordinary video display: 320 × 240 dot matrix;
3, digital standard DVD display: ≥ 640 × 480 dot matrix;
4, complete computer video: ≥ 800 × 600 dot matrix;
Tenth point: need to understand the outdoor display design and installation problems?
1, the screen body and the combination of the building must be strictly waterproof and leakproof; screen body to have a good drainage measures, once the occurrence of water can be discharged;
2, in the display and the installation of lightning protection devices on the building. The display body and the shell to maintain a good grounding, grounding resistance is less than 3 ohms, so that lightning caused by the timely discharge of large current;
3, the installation of ventilation equipment cooling, so that the screen inside the temperature between -10 ℃ ~ 40 ℃. The top of the screen body installed above the axial fan, discharge heat;
4, the choice of operating temperature -40 ℃ ~ 80 ℃ between the industrial-grade integrated circuit chip to prevent the winter temperature is too low so that the display can not start. ;
5, in order to ensure that the environment in the case of strong long-range visual, you must use ultra-high brightness light-emitting diodes;
6, display media selection of new wide viewing angle tube, wide viewing angle, pure color, consistent coordination, life of more than 100,000 hours. The outer packaging of the display medium is the most popular with the side cover along the square cylinder, silicone seal, no metal assembly; its exquisite appearance beautiful, durable, with anti-sunlight, dust, water, high temperature, anti-circuit short circuit "Five anti" features.