1. Hardware connection
1. What are the supporting components of the LED screen?
Power distribution system LED screen control system play system
2. What hardware components are required for the overall construction of the LED screen?
LED screen back frame, screws, butterfly buckle or U-shaped buckle, hanging beam
3. What are the requirements of the LED screen for the continuous control of the computer?
System, memory, CPU, graphics card.
4. LED screen line connection mode
① The signal between the LED screen box and the box is connected by network cable;
② The power supply between the LED screen box body and the box body is composed of the power cord connection;
5. What are the matters needing attention for connecting the LED screen, audio, camera and other hardware connection?
Correct connection mode, correct matching of interface, field and environment interference factors.
2. Screen imaging
1, LED screen imaging principle and hardware composition?
Light Emitting Diode (Light-emitting diode).
Composition: unit board, box body, power supply, receiving card and parts connection accessories and wiring.
2. Points of LED screen rental box (500 * 500)
P2.6 is 192 * 192, and P2.9 is 168 * 168;
128 * 128 for P 3.9 and 104 * 104 for P4.8
3. Display the scale summary description
The standard screen ratio is generally 4:3 and 16:9, but there are several special cases of 16:9, such as 15:9 and 16:10. Because the ratio is close to 16:9, these three screen ratios can be called widescreen, and there is a special ratio, such as 21:9 and so on.
4. What are the requirements for LED playback content and materials?
Content: clear theme, clear copyright, do not involve political violations and other conditions.
ask:
Video: made according to the proportion, common format MOV, MP4, code H264, HAP;
Image: RGB, format JPG or PNG;
3. Control systems
1. Which hardware control systems control the LED screen?
Control system: video processor, splicing, video console
Play system: control computer, multimedia server
2. What does the large screen broadcast through split screen?
Hardware system: switch, video console
Software system: multimedia server
3. The matching use of different activity scale and hardware?
Essential equipment for large activities: server, processor, large transmission card, dual backup system, optical fiber, technical personnel (professional)
4, the processor function
LED video processor, is LED dedicated video processor, and it needs to complete the task, is from the external (such as blu-ray DVD, computer, hd playback box, etc.) image signal into LED display can accept signal, and the video image optimization processing, make the led screen display picture more clear and smooth.
4. Regular problems
1. Electricity consumption calculation?
500mm 500mm single outdoor box power: 350w, single indoor box power: 180w
2. Common LED model?
P1.9,P2.5,P2.6,P2.9,P3.91,P 4.81,P5.95
3. How to achieve a large-screen double backup?
Front-end backup: the broadcast control system
Back-end backup: the processing system
5. Build a problem
1. What are the components of special-shaped construction?
According to the stage design demand for lifting, hanging and other ways, special demands can contact the manufacturer to customize the special screen.
2. Large screen fixed mode and matters needing attention?
Rear frame, Japanese frame back frame, special occasions can be customized frame fixed
3. How to build a large screen in a different shape?
① By the Angle of the screen around out
② By the large screen fixed lock around out
6. On-site problems
1. What is the cause of the lag in individual positions on the large screen? How to deal with the solution problem?
The signal line at the rear of the screen has dropped. When connecting the signal line, the signal line should be inserted in the socket and can be checked repeatedly.
2. Matters needing attention for using large-screen environment factors?
Outdoor screen after glue irrigation treatment, only pay attention to the power connection line and line grounding problems.
3. The unit board is dark or not bright for a long time?
Check whether the module pin and integrated circuit corresponding to the fault on the unit plate are Not soldered, short circuit and open circuit.
4, the whole section of the unit plate is not bright, dark bright?
(1) Visually check whether the wiring line between the power supply connection line, the unit board and the power supply module indicator light are normal;
(2) Use the multimeter to measure whether the unit board has normal voltage, and then measure whether the voltage output of the power module is normal. If no, it is judged that the power module is broken;
(3) Although the voltage of the power module is low, the vi fine tuning (the power module near the indicator) to make the voltage reach the standard; fault phenomenon: the unit board appears the area (the unit board has two areas) without red or green.
5. What are the problems that cause the large screen and the black screen?
Power supply, signal, transmission system, control system, LED screen itself, Misoperation.
6. Big screen "grayscale"?
The 0-255 brightness change of the large screen
7, outdoor gray scale debugging?
Outdoor display is affected by regional weather, which requires the video processor to have better picture quality improvement ability, with advanced image scaling processing algorithm, to ensure that the video image after scaling processing, the clarity of the image to maintain the maximum gray level.
In addition, the video processor also needs to have rich image adjustment options and adjustment effect, the image brightness, contrast, gray scale processing, to ensure that the screen output soft and clear picture.
8. Is there any requirement for the LED activity site environment? What are the precautions? Waterproof screen model?
Outdoor P3.9 and P4.81 screens are not affected by the weather at the rainy days, but the big screen can not be soaked in water, P3.9 P4.81, P5.65, P5.95
9. LED screen flash reason and processing methods?
Power distribution system; signal transmission, environmental interference
(1) The driver loader is wrong;
(2) The network cable between the computer and the screen is too long or the network cable fails;
(3) The sending card or control card is broken;
(4) Short circuit between the power supply and the control card;
(5) The power supply output voltage and current is unstable;
10, the network cable quality measurement standard?
Network cable thickness and weight, and brand.
11. Floor screen
It is mostly used for the press conference, and the common ground screen is composed of p4.81+ mask (the main materials of the mask are: acrylic, rubber, glass, and better rubber material).
12. Cause and treatment method of spontaneous combustion of large-screen power cord?
(1) Short circuit, overload, power line quality problems;
(2) The selected LED is over voltage (change LED);
(3) The incoming line is very thin, leading to the overload of excessive load (check the line and standardize the operation);
(4) Check the transformer, the inferior transformer may lead to the instantaneous output current voltage is very high, causing the module damage.(Change the power switch);
(5) Try to choose the metal box body, and the metal bottom plate;
13. What is the reason for the Moore pattern in outdoor LED display photos and the processing method?
Reason: The refresh frequency of LED display is different from that of mobile phone shutter, and the electronic products spread in wave type, resulting in mutual interference.
method of disposition:
(1) Change the Angle of the camera, because the Angle of the object will lead to molar ripples, slightly change the Angle of the camera (by rotating the camera) can eliminate or change any molar ripples existing;
(2) Change the camera position. In addition, by moving the left and right or up and down can reduce molar ripples;
(3) Change the focus, detailed drawings on too clear focus and height detail may lead to molar ripples, slightly change the focus can change the clarity, so as to help eliminate molar ripples;
(4) Change the focal length of the lens to change or eliminate Moore ripples;
(5) Use the front filter directly installed in front of the CCD, so that the exposure conditions meet the spatial frequency, thoroughly filter the high spatial frequency part of the image, reduce the chance of creating LED display, but this will also reduce the sharpness of the image;
(6) Use the software processing, use the Photo shop plug-in, etc., to eliminate any molar ripples on the final image
