Led display FAQ

35.What¡¯s the differences between using NICHIA tubes and chinese tubes for full color LED display except prices ?
((1)chips: NICHIA produces chips itself, chinese tubes use USA or Taiwan chips usually.
(2)packaging: NICHIA does packaging itself, there is no manufacturer in China; there are more packaging factory for Chinese tubes.
(3)consistency: difference of chip wavelength is less in the same lot of NICHIA tubes, good consistency; worse consistency in Chinese tubes.
(4)life time: longer life time for NICHIA tubes, serious attenuation for Chinese tubes.

28.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¡Âdots/M2¡Á0.3¡Â2
Green LED lamp brightness: brightness (CD)/M2¡Âdots/M2¡Á0.6
Blue LED lamp brightness: brightness (CD)/M2¡Âdots/M2¡Á0.1
For example: 2500dots/sqm, 2R1G1B, brightness requirement 5000 CD/M2, so:
Red LED lamp brightness: 5000¡Â2500¡Á0.3¡Â2=0.3
Green LED lamp brightness: 5000¡Â2500¡Á0.6¡Â2=1.2
Blue LED lamp brightness: 5000¡Â2500¡Á0.1=0.2
Brightness per pixel: 0.3¡Á2+1.2+0.2=2.0 CD

29. why we choose DVI display connector standard ?
(1)The DVI led 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

30.Whether we can use a notebook to control the display or not, why ?
Can¡¯t . the display card of a notebook is inside, can¡¯t realize connection with control system. Now, there is a type of notebook with DVI connector, it can realize notebook control.