What factors affect the LED screen size?
(1)Effective viewing distance and practical field size;
(2)pixel size and resolution;
(3)Area estimation based on cell;
(4)screen mechanical installation and maintenance operation space;
(5)Infection of screen obliquity to distance

What are the displaying effects clients needed?
(1)Characters display: depends on its character size and resolution needs;
(2)Common video display: 320×240 dot matrix;
(3)Digital standard DVD display: ≥640×480 dot matrix;
(4)Full computer video ≥800×600 dot matrix

What are the environmental brightness required to the led screen?
(1)Indoor: >800CD/M2
(2)Semi-indoor: >2000CD/M2
(3)Outdoor (locate south ,face north) >4000CD/M2
(4)Outdoor (locate north ,face south) >8000CD/M2

What are the brightness requirements of RGB for white balance?
Red, Green, Blue contributes differently in white color quality, the root reason is due to human eyes’ retina, feels different to light that has different wavelength. We got below proportions after mass experiments and inspections for your references.
Brightness proportion of simple RGB: 3:6:1
Brightness proportion of exact RGB: 3.0:5.9:1.1

Why high level full color display should use pure green tube?
In order to meet abundant colors and emit enough brightness, the area of color triangle should as close as possible to color curve in tongue shape in chroma chart. The finial curve in tongue shape is 515nm wavelength light, so, high level LED display choose pure green LED tube, whose wavelength close to 515nm. For example choose green LED lamp which has wavelength 520nm、525nm or 530nm

How to calculate brightness of each lamp under the conditions of definite brightness and pixel density?
The calculating methods as below: ( for example: 2R,1G, 1B)
Red LED lamp brightness: brightness (CD)/M2÷dots/M2×0.3÷2
Green LED lamp brightness: brightness (CD)/M2÷dots/M2×0.6
Blue LED lamp brightness: brightness (CD)/M2÷dots/M2×0.1
For example: 2500dots/sqm, 2R1G1B, brightness requirement 5000 CD/M2, so:
Red LED lamp brightness: 5000÷2500×0.3÷2=0.3
Green LED lamp brightness: 5000÷2500×0.6÷2=1.2
Blue LED lamp brightness: 5000÷2500×0.1=0.2
Brightness per pixel: 0.3×2+1.2+0.2=2.0 CD

why we choose DVI display connector standard ?
(1)The DVI display connector meets the computer international standard
(2)No need to open cabinet, you can install easily
(3)High memory, display good quality dynamic pictures
(4)Strong compatible ability of software and hardware
(5)Support all operation system and application software, display neatly and conveniently
(6)Volume-produce, low cost, convenient maintenance

How to help client choose suitable display?
(1)The needs of displaying content
(2)Visible distance,, visual angle confirm
(3)Requirements of cabinet resolution
(4)Requirements of installation environment

What’s the normal length and width proportion of display?
(1)Drawing screen: subject to displaying content
(2) Video screen: normal 4:3 or approaching 4:3;perfect proportion 16:9
What factors should be taken into consideration of screen size design?
-There is three important factors in designing screen size:
(1)Displaying content
(2) Conditions of field and space
(3) LED module size

What are the index on the power consume and the requirements for the power supply of the LED screen?
The power consume of the LED screen have the Average power consume and the Maximum power consume. We also called the Average power consume as the Working power consume, it’s the factual power consume when led screen operating normally. The Maximum power consume is the power consume when it’s starting or full lighting and the other extreme situations. The Maximum power consume is the necessary factor to consider when using the AC electricity power supply, the depth of the wire and the switch, too. Generally, the Average power consume is one out of three of the Maximum power consume.
The LED display screen is the big size precision equipment. To operate in security and stability, the AV 220V power supply input port of the LED display screen or the connected computers’ power supply input port need to connect with the ground.
Noted: computers’ power supply input port also must be connected with the body of the computer.

What are the installation requirements of the LED display screen?
Power supply: the power supply connector must be match for the size of the LED display screen.
220V electricity power supply, live wire, neutral/null wire and the earth wire.
380V electricity power supply, three live wires, neutral/null wire and the earth wire.
The intercept area of the live wire is the same as the null.
The LED display screen above 0.1 million KW must have the lower-voltage equipment.

What are the considering factors of the Outdoor LED display screen?
Main questions of outdoor display as below:
(1)display installed in the outdoor, solarization and drench, blow and dust, bad working environment, electrical equipment being wringing and damp will cause short circuit, even fire, cause conk out, even fire, result in loss.
(2)the display may be attacked by the strong electromagnetism made by the thunder and lighting.
(3)The big change of the environment temperatures. The Operating LED display will emit a lot of heating, if the environment temperature is too high, the molectron of the LED screen maybe operating un-normally to damage for its bad giving heating out, finally the LED display system will not operate normally as usual.
(4)The display has a wide range of angle, long viewing distance, big change of the environment light, especially the direct to the sunshine.

With these special requirements, the outdoor LED displays needed:
(1) The parts connecting the body of the LED display with the building must be waterproof and anti-leaking strictly as the display. The display must have the measurements for water giving out. Once leaked, it will be given out smoothly.
(2) The lightning rod should be installed on the LED display or the building. The body and the frame of the display must to keep connecting with the earth, the resistor of the earth wire should under 3 Q , so as to the heavy current from lightning can be discharged in time.
(3) Install the ventilator equipment to lower the temperature, keep the inner cabinet temperature in the range of -10 ~ 40 centigrade degree. The back top of the display must install the rolling electronic fans to give the heating out.
(4) Choose the industrial using IC with the working temperature range of -10 ~ 40 centigrade degree for fear the LED display can not start in the low temperature of the winter.
(5) To be seen form a long distance in the high brightness environment, it must be using the extra high brightness LED lamps.
(6) Choosing the new large angle LED lamps as medium, the LED display will have a larger angle, vivid colors, consistent operation and a long life of more than 100 thousand hours. The medium has a popular package with the hat-edge and square shape in cylinder, sealed by Silicon glue, assembly without metal. Also the display has an unique exterior outface, solid and durable, has the characteristics of anti-dazzle, waterproof, impurity proof, protection from high temperature and short circuit.