What’s the normal length and width proportion of display?
Drawing screen: subject to displaying content
Video screen: normal 4:3 or approaching 4:3;perfect proportion 16:9
Controlled dots by a set of control system
Communication screen A card: single color, bicolor 1024×64
Communication screen B card:: single color: 896×512? bicolor: 896×256
DVI bicolor screen: 1280×768
DVI? full color screen: 1024×512
29. What factors should be taken into consideration of screen size design ?
-There is three important factors in designing screen size:
(1)? need of displaying content
(2) conditions of field and space
(3) unit template size (indoor display) or pixel size (outdoor display)
-Should increase drop press and startup facilities for 10KW aboved display
-Communication requirements: communication distance is defined by the length of communication line
-Install communication line should according to the length standard of used communication line suitable for the model of installed display.
The communication wires are not allowed to install in the same wire tube with the electronic wires.
-Installation requirements:
Make sure that the led display be placed flat, don’t lean to the back.
-Hanging installation must use the adjustable pole for up and down.
-Have to fix the hooking lock for fare the LED screen drop off from the wall before install it onto the wall.
-Standing installation must have the position stable screw.
30. 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 it’s 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 panel 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
31.How to help client choose suitable led display?
(1)the needs of displaying content
(2)visible distance,, visual angle confirm
(3) requirements of cabinet resolution
(4)requirements of installation environment
(5)cost control
32.What’s the differences between indoor module full color led screen and SMD full color screen ?
(1) lighting part: normally, the display module is olivine color for module full color led screen, more expensive for pure green module; normally, use pure green chips for SMD full color screen.
(2)display effect : pixels in module full color screen looks wider, lower brightness, easy to cause mosaic phenomenon; better consistency and higher brightness for SMD full color screen.
(3)maintenance: not easy maintenance for module full color, higher cost of replacement of whole module; easy maintenance for SMD full color, cell lamp can be maintained and replacedx.
33. Can SMD LED be used in outdoor screen ? Why ?
Can’t . requirements for installation structure of outdoor screen is strict, SMD LED panel can not adapt to outdoor scurviness environment
High requirements for outdoor screen brightness, at present, SMD LED can’t reach the brightness requirements of outdoor screen
34. Why the lead time of outdoor screen is longer ?
(1)materials purchase: the purchase term of LED lamps is longer, special imported chips, the lead time takes 4-6 weeks
(2)complicated producing technics : need PCB design, cover making, glue filling, white balance adjust, etc
(3)strict structure requirements: design for cabinet, need to consider windproof, rainproof, lightningproof , etc.
32.What’s the differences between indoor module full color led screen and SMD full color screen ?
(1) lighting part: normally, the display module is olivine color for module full color led screen, more expensive for pure green module; normally, use pure green chips for SMD full color screen.
(2)display effect : pixels in module full color screen looks wider, lower brightness, easy to cause mosaic phenomenon; better consistency and higher brightness for SMD full color screen.
(3)maintenance: not easy maintenance for module full color, higher cost of replacement of whole module; easy maintenance for SMD full color, cell lamp can be maintained and replacedx.
33. Can SMD LED be used in outdoor screen ? Why ?
Can’t . requirements for installation structure of outdoor screen is strict, SMD LED panel can not adapt to outdoor scurviness environment
High requirements for outdoor screen brightness, at present, SMD LED can’t reach the brightness requirements of outdoor screen
34. Why the lead time of outdoor screen is longer ?
(1)materials purchase: the purchase term of LED lamps is longer, special imported chips, the lead time takes 4-6 weeks
(2)complicated producing technics : need PCB design, cover making, glue filling, white balance adjust, etc
(3)strict structure requirements: design for cabinet, need to consider windproof, rainproof, lightningproof , etc.
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÷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
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.
