Everybody to learn circuit board screen to master commonsense knowledge

Aug. 10, 2011 - PRLog -- Everybody to learn the LED display circuit board to master commonsense knowledge:


1. The size of the screen design in design, a big screen body hours three important factors:
(1) showing the contents of the needs;
(2) the space condition;
(3) display unit size (screen) template indoor or outdoor screen size (pixel).
2. Power consumption and power supply requirements
Display of power consumption is divided into average power consumption and maximum power consumption. Average power consumption and says, is at ordinary times the actual work electricity power consumption. The biggest power consumption is a start all extreme situation or light of power consumption, the biggest power consumption is ac power supply (line diameter, switch, etc.) must consider the factors. General average power consumption for the biggest 1/3 of the power consumption.
Display large precision of electronic equipment, and can be used for safety & # 215; Work, its AC220V power input or computer connected to it AC220V power input must be grounded.
Note: the computer AC220V power input grounding end already and computer cabinet linked.
3. LED power board outdoor screen should consider the problem
Outdoor screen, the main problems of the following:
(1) display installed in outdoor, often weathered, the wind dust cover, working conditions. Electronic equipment is drowning or serious damp will cause a short-circuit even on fire, cause trouble or fire, loss;
(2) screen might be caused by lightning completed strong magnetic attacks;
(3) the environment temperature varies greatly. Display work itself will produce a certain quantity of heat, if the environment temperature is too high and heat dissipation and bad, integrated circuit may didn"t work properly, and even was burned down, so that the display system does not work properly;
(4) at a wide, far beyond requirements, vision, wide requirements; The environment changes, especially big light may be direct sunlight.
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According to the special requirements, outdoor screen must do:
(1) screen body and screen body and architecture of the band must be strictly waterproof and leak; Screen body to have good drainage measures, once produce water can smooth discharge;
(2) in the display and building installation to avoid device. Display subject and shell to maintain good grounding, grounding resistance is less than 3 ohms, caused by lightning current timely bleeder;
(3) cooling and ventilation equipment installation, make the screen body internal temperature in 10 ℃ ~ 40 ℃-between. Screen behind body mounted on top of axial flow fans from heat.
(4) choose working temperature in 40 ℃ ~ 80 ℃-between the integrated circuit chips, prevent private winter temperature too low to screen won"t start. ;
(5) to make sure in environmental light under the condition of strong long-distance visible, to must choose high brightness leds;
(6) shows that medium selecting new wide Angle tubes, the perspective broad, colour is pure, consistent coordination, life over 100000 hours. Show the medium for the packaging of the most popular with the cylinder cover square, silica gel seal, no fancy dress with metal; Its exterior exquisite, beautiful and durable, has the direct sunlight, dustproof, waterproof, prevent high temperature, prevent a short circuit "five-" characteristics.
FAQ
1. Consider the user can allow screen of the area of the body factors have?
(1) effective and practical field beyond the size of the relations;
(2) the pixel size and resolution;
(3) unit for base area estimate;
(4) screen body machinery installation and maintenance operation space;
(5) screen to the influence of body dip Angle distance.
2. The needs of user playback? What are those?
(1) text indicate that depending on the size and text: protest on demand;
(2) : 320 & video shows common # 215; 240 dot matrix;
(3) digital standard DVD shows: 640 & # 215; : 480 dot matrix;
(4) complete computer video: : 800 & # 215; 600 dot matrix;
3. Environmental brightness for screen body what brightness demand?
General brightness demand is as follows:
(1) indoor: > 800 CD/M2
(2) half indoor: > 2000 CD/M2
(3) outdoor (it faces north) : > 4000 CD/M2
(4) sits outside (> 8000) : CD/M2
4. Red, green, blue white in the composition of what kind of brightness demand?
Red, green, and blue in the white looks aspects contribution is different. The basic reason is due to the human eye ShiWang
Film for different wavelengths of light feel different and cause. After a great deal of experiments verify get the following about proportion, for participation
Test design.
Simple red, green, blue brightness for: 3:6:1 than
Accurate red, green, blue brightness for: 3.0:5.9 than: 1.1
5. Why upscale widely used to use pure green tube?
In the actual LED display production, should choose high luminous efficiency and can get show color rich bright three colors
The LED lamp, in order to make in a chromaticity diagram color as far as possible in the triangle area and & # 215; Nearly tongue shape spectrum curve, to meet the rich color
Color and produce enough brightness and tongue shape curve top for 515 nm wavelength of light, so high-grade LED display to choose
Close to 515 nm wavelength of pure green light tube, such as selection of LED 520 nm, 525 nm wavelength of light or 530 nm
The LED lamp.
6. In clear brightness and the requirements of the density of some conditions, how to computer single pipe brightness?
Calculation method are as follows: (the two red, a green with a blue, for example)
Red LED light degrees: brightness (CD) / M2 & # 247; Points/M2 & # 215; 0.3 & # 247;2
Green LED light degrees: brightness (CD) / M2 & # 247; Points/M2 & # 215; 0.6
The blue LED light degrees: brightness (CD) / M2 & # 247; Points/M2 & # 215; 0.1
For example: 2500 per square metre, 2 R1G1B point density, each square meters brightness demand for 5000 CD/M2, the:
Red LED light degrees for: 5000 & # 247; 2500 & # 215; 0.3 & # 247;2 = 0.3
Green LED lights for: 5000 degrees and # 247; 2500 & # 215; 0.6 & # 247;2 = 1.2

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