6． Luminance and dot density in the clear requirements of conditions, how to control the brightness of a single computer？

        Calculated as follows: (in two red, one green, one blue for example)

        Brightness red LED lights：Brightness（CD）/M2÷Points/M2×0.3÷2

        Green LED light Brightness：Brightness（CD）/M2÷Points/M2×0.6

        Brightness blue LED lights：Brightness（CD）/M2÷Points/M2×0.1

        Such as：2500 points per square meter density，2R1G1B，Requirements for each square meter brightness 5000 CD/M2，Then：

        Brightness of the red LED lights：5000÷2500×0.3÷2=0.3

        Brightness of green LED lights：5000÷2500×0.6=1.2

        Brightness of blue LED lights：5000÷2500×0.1=0.2

       The brightness of each pixel：0.3×2+1.2+0.2=2.0 CD

7． Why LED screen display interface standard to use DVI？

（1） DVI graphics card interface is consistent with international standards, the computer display interface；

（2） Without opening the chassis, you can easily install；

（3） High memory, dynamic picture display capability；

（4） Strong hardware and software compatibility；

（5） Supports all operating systems and application software, display flexibility；

（6） Mass production, low cost, easy maintenance。

8． LED display can not use the notebook control, why？

       Can not。Laptop graphics card is built-in, can not be achieved in connection with the control system。

9． Full color to use on domestic management and use of sub-tube except for the price difference between what？

（1）Die：Nichia independent production company die, the general use of American-made pipe or Taiwan companies die；

（2）Package：Nichia own package, no domestic production facilities, domestic manufacturers more control package；

（3）Consistency：Nichia tube die with the wavelength difference between the small batch, good consistency, coherence is relatively poor domestic management；

（4）Use life：Nichia relatively long tube life, made more serious tube attenuation；

10．Indoor LED Module SMD LED full color screen and full color What is the difference？

（1）Light-emitting part：Full color LED display module module usually yellow-green, and pure green, the more expensive modules；

                              SMD LED Full Color generally use plain green die；

（2）Shows the effects：Full color LED pixel module visual feeling coarse, low-lit, easy mosaic phenomenon；

                              SMD LED Full Color consistency is better, higher brightness；

（3）Maintain：Module LED full color screen is not easy to maintain, the higher cost of replacement block module；

                      SMD LED Full color easy to maintain, maintenance and replacement can be a single light；

11．Outdoor LED display can not use surface mount LED, Why？

       Can not。Outdoor LED display installation structure demanding outdoor SMD LED can not adapt to the harsh environment；

       Outdoor LED display brightness higher, the current SMD LED outdoor screen brightness can not meet requirements。

12．Outdoor LED display why the relatively long production cycle？

      （1）Procurement of raw materials：LED lamp long procurement cycle, particularly imports die, order cycle takes 4-6 weeks；

      （2）Complex production process：And subject to PCB design, production casing, filling glue, adjust white balance, etc.；

      （3）Structure demanding：General design for the box, need to consider wind, rain, lightning, etc.。

13．How to help users select the appropriate LED display？

      （1）Display needs；

      （2）Visual distance, angle of confirmation；

      （3）Screen Resolution requirements；

      （4）Installation environment requirements；

      （5）Cost control；

14．LED display aspect ratio is the number of general？

        Photo LED display: display the contents of the identified according to；

        Video LED Display: generally 4:3 or close to 4:3; the ideal ratio of 16:9。

15．An LED display control system can control the number of points?

        Communications LED display card A：Monochrome Two-color:1024×64

        Communications LED display card B：Monochrome：896×512 Two-color：896×256

        DVI dual-color LED display：1280×768

        DVI Full color LED display：1024×512

16．LED display installation requirements？

       Power requirements：Power supply connection point should be within the Screen Size

       220V mains power supply, FireWire cable grounding line 0；

       380V mains power supply, three-wire grounding wire FireWire 10；

       FireWire and the zero line of the same conductor cross-sectional area；

       10 kW or more display devices should be added step-down start。

       Communication requirements：Communication distance is long for the defined lines of communication。

       To display the model with the installation of communication lines used to install the communications cable length standard。

       Communication lines and power lines against the same line in the alignment tube。

       Installation requirements：LED display installed around the level, do not allow backward

       LED display to install the upper and lower lifting lever

       Wall-mounted LED display screen before installation to forward off hook

       Floor LED display installed to add support bolt positioning。