LED display design and selection
I.> LED screen the size of the design
(A) display needs;
(B) site conditions in space;
(C) display unit template size (indoor display) or pixel size (outdoor screen);
II.> Power consumption and power requirements
Display of power consumption and maximum power consumption is divided into the average power consumption. Average power consumption is also called working capacity, is usually the actual power consumption. Maximum power consumption is a startup or when the lights of such extreme power consumption, maximum power is AC power supply (wire, switches, etc.) must be considered elements. The average power consumption is generally the largest power of 1 / 3.
Display is a large-scale precision electronic equipment, in order to safe use and can * work, its AC220V power input or with a computer connected to AC220V power input must be grounded. Description: The computer AC220V power input ground terminal has been connected to the computer chassis.
III.>LED display issues should be considered
(A) screen installed in the outdoors, often sun and rain, wind and dust cover, working environment. Electronic equipment is wet or damp can cause serious short-circuit or fire, cause failure or even fire, resulting in losses;
(B) display may be due to strong electric magnetic lightning attack;
(C) ambient temperature changes significantly. Display work itself must have some heat, if the ambient temperature is too high and heat it bad, integrated circuits may not work correctly, or even destroyed, so that shows the system does not work;
(D) wide audience and, Sight Distance is far, wide vision requirements; ambient light changes, in particular, may be subject to direct sunlight;
IV.>outdoor LED display must do the following
(A) Screen and the Screen and the construction of the junction must be strictly waterproof leakproof; Screen to have good drainage measures in the event of a smooth water discharge;
(B) the screen to install lightning protection equipment and buildings. Display main body and cover good grounding, grounding resistance of less than 3 ohms;
(C) installation of ventilation to cool internal body temperature to screen -10 ℃ ~ 40 ℃ in between. Screen behind the top of the installed fan, exhaust heat;
(D) use operating temperature between -40 ℃ ~ 80 ℃ industrial-grade integrated circuit chip, the winter temperature is too low to prevent the display could not be activated;
(E) To ensure a strong ambient light in the case of remote visualization, high brightness light emitting diodes must be selected;
(F) show wide selection of new media angle control, wide viewing angle, color pure, consistent coordination, life expectancy more than 100,000 hours. Shows the outer packaging for the media the most popular along the square tube with cover, silicone seals, no metal of assembly; its exquisite appearance, durable, with anti-direct sunlight, dust-proof, waterproof, anti-high temperature, anti-short circuit characteristics;
LED display FAQ
I.> consider the user can allow the body of the screen space area of the factors which
(A) an effective line of sight relationship with the actual field size;
(B) pixel size and Resolution;
(C) the area is estimated as the base unit;
(D) Screen mechanical installation and maintenance space;
(E) Screen angle on the impact of distance;
II.> Users need to playback
(A) the text shown: as the text size and differentiate to demand;
(B) ordinary video display: 320 × 240 matrix;
(C) digital standard DVD Show: ≥ 640 × 480 matrix;
(D) the full computer video: ≥ 800 × 600 matrix;
III.> What environmental brightness of the display brightness
(A) Indoor:> 800CD/M2;
(B) semi-indoor:> 2000CD/M2;
(C) outdoor (look northward):> 4000CD/M2;
(D) outdoor (facing south):> 8000CD/M2;
IV.> Red, green and blue and white composition in what kind of brightness
Red, green, blue and white Condition in the contribution of different aspects. The fundamental reason is because the human eye retina
Film for different wavelengths of light caused by feeling different. After a number of experimental tests have approximately the following ratio for the reference design: simple red, green and blue intensity ratio :3:6:1 - red, green and blue intensity ratio accuracy: 3.0:5.9:1.1;
V.> Why use high-end LED full color display tube of pure green
LED display in the actual production, should be chosen high luminous efficiency can be a rich vibrant color tricolor
LED lamp, so that the color in the chromaticity diagram in the triangle area as far as possible and * almost tongue-shaped spectrum of color curves to meet the rich color and brightness of the tongue given adequate top-shaped curve for the 515nm wavelength of light, so high-end LED display selected wavelength close to 515nm pure green light LED tube, such as use 520nm, 525nm or 530nm wavelength LED light tubes.
VI.> In the specific requirements of brightness and dot density conditions, how to calculate the brightness of a single tube
Calculated as follows: (in two red, one green, one blue for example) the red LED lamp brightness: brightness (CD) / M2 ÷ Points / M2 × 0.3 ÷ 2; green LED lamp brightness: brightness (CD) / M2 ÷ Points / M2 × 0.6; blue LED lamp brightness: brightness (CD) / M2 ÷ Points / M2 × 0.1;
For example: 2500 points per square meter density, 2R1G1B, per square meter brightness requirements for 5000 CD/M2, then: red LED light brightness: 5000 ÷ 2500 × 0.3 ÷ 2 = 0.3; green LED light brightness: 5000 ÷ 2500 × 0.6 ÷ 2 = 1.2; blue LED light brightness: 5000 ÷ 2500 × 0.1 = 0.2; brightness of each pixel: 0.3 × 2 +1.2 +0.2 = 2.0 CD;
VII.> Why use DVI display interface standard
(A) DVI display card interface is in line with international standards for computer display interface;
(B) without opening the chassis, can be easily installed;
(C) high-memory, dynamic picture display capability;
(D) ability of hardware and software compatibility;
(E) support for all operating systems and application software, display flexibility;
(F) high-volume, low cost, easy maintenance;
VIII.> LED display can not control the use of laptop
Laptop graphics card is built-in, can not be achieved with the control system connection, the current BOE has a laptop now with a DVI interface allows notebook control;
IX.> Full color to use on sub-tube with the use of domestic control which except for the price difference between
(A) die: Nichia independent production company die, the general use of American-made pipe or Taiwan companies die;
(B) Package: Nichia Corporation autonomy package is no domestic production facilities, domestic manufacturers more control package;
(C) Consistency: Japan Asia pipe die with the wavelength difference between the small batch, good consistency, coherence is relatively poor domestic management;
(D) life: life on a relatively long sub-tube, tube attenuation made more serious;
X.> LED Indoor Full Color LED Module SMD full color display screen and What is the difference
(A) light-emitting components: module full color screen of the display module is generally yellow and green, and pure green, the more expensive modules. SMD full color general use pure green die;
(B) display: Module full color pixel visual feel coarse, low-lit, easy mosaic phenomenon. SMD full color consistency better, higher brightness;
(C) Maintenance: Module full-color easy maintenance, block module to replace high cost. SMD full-color easy to maintain, can be a single lamp maintenance and replacement;
XI.>outdoor LED display can not use Surface Mount LED
LED outdoor display structure, demanding to install, SMD LED can not adapt to the harsh outdoor environment;
LED outdoor display brightness higher, the current SMD LED outdoor screen brightness can not meet requirements;
XII.>outdoor LED display why the relatively long production cycle
(A) procurement of raw materials: LED lamp long procurement cycle, particularly imports die, order cycle takes 4-6 weeks;
(B) the complexity of production process: and subject to PCB design, production casing, filling glue, adjust white balance, etc.;
(C) Structure of demanding: the general design for the box, need to consider wind, rain, lightning, etc.;
XIII.>The user to choose LED displays
(A) display needs;
(B) visual distance, visual angle of the confirmation;
(C) Screen Resolution requirements;
(D) installation of environmental requirements;
(E) cost control;
XIV.>LED display aspect ratio in general
Photo Screen: According to the show's content to determine: the video screen: usually 4:3 or close to 4:3; the ideal ratio of 16:9;
XV.>Control system can control the number of points
Communication Screen A Card: monochrome, color 1024 × 64;
Communication Screen B card: Monochrome: 896 × 512 color: 896 × 256;
DVI-color screen: 1280 × 768;
DVI Full color: 1024 × 512;
XVI.>LED display installation requirements
Power requirements: power supply connection point should be within the screen body size;
220V mains power supply, FireWire 0 line grounding wire;
380V mains power supply, three FireWire, an O line and ground; FireWire cable with the O line the same cross-sectional area;
10 kW or more should be added step-down screen boot device;
Communication requirements: communication from the communication line is defined length;
To display the model with the installation of communication lines used for the length of the standard to install communication lines;
Communication lines and power line against line pipe in the same alignment;
Installation Requirements: screen installed around the level, do not allow backward;
To install the upper and lower lifting lever;
Wall-mounted forward off before installation hook;
Installed to add support for ground positioning bolt;
