What factors need to be considered when purchasing LED electronic display
Author:Wang Yu Time:2021-09-14 13:32 Browse(443)
What are the factors to consider the screen area allowed by the user's site?
What are the factors to consider the screen area allowed by the user's site
(1) the relationship between effective sight distance and actual site size<(2) pixel size and resolution
(3) area estimation based on cell
(4) operation space for screen mechanical installation and maintenance<(5) the influence of screen tilt angle on distance.

What factors need to be considered when purchasing LED electronic display


· what kind of playback effect do users need
(1) text display: it depends on the text size and resolution requirements
(2) general video display: 320 × 240 lattice<(3) digital standard DVD display: ≥ 640 × 480 lattice<(4) complete computer video: ≥ 800 × 600 dot matrix
· what are the brightness requirements for the screen (1) indoor:> 800cd / m2
(2) semi indoor:> 2000cd / m2
(3) outdoor (facing south):> 4000cd / m2
(4) outdoor (facing south):> 8000CD / M2
· what are the brightness requirements of red, green and blue in white composition
red, green The contribution of blue to the quality of white is different.
the fundamental reason is that the retina of human eyes has different light perception for different wavelengths.
after a large number of experiments, the following approximate proportion is obtained.
for reference design:
the simple red green blue brightness ratio is 3:6:1
the accurate red green blue brightness ratio is 3.0:5.9:1.1
· why Full color display with green tube
in the actual production of LED display screen,It is necessary to select three primary color
LED tubes with high luminous efficiency and rich and bright color rendering, so as to make the area of color triangle in chromaticity diagram as close as possible to the tongue shaped spectral color curve, so as to meet the requirements of rich color and sufficient brightness. The top of tongue shaped curve is 515nm wavelength light, so the pure green LED tube with wavelength close to 515nm is selected for high-end LED display screen, such as 520nm, 520nm How to calculate the brightness of a single LED tube under the condition of clear brightness and point density brightness of red LED: brightness (CD) / m2 △ points / m2 × 0.3 △ 2
brightness of green LED: brightness (CD) / m2 △ points / m2 × 0.6
brightness of blue LED: brightness (CD) / m2 △ points / m2 × 0.1
for example, if the density of 2500 dots per square meter, 2R1G1B, and the brightness of 5000 CD / m2 per square meter are required, the brightness of red LED lamp is 5000 △ 2500 × 0.3 △ 2=0.3
the brightness of green LED is 5000 △ 2500 × 0.6 △ 2=1.2
the brightness of blue LED is 5000 △ 2500 × 0.1=0.2
brightness per pixel: 0.3 × 2 + 1.2 + 0.2=2.0 CD
· why choose DVI display interface standard
(1) the interface of DVI display card is in line with the international standard of computer
(2) it is easy to install without opening the chassis
(3) high memory,The ability of dynamic picture display is strong<(4) strong compatibility between hardware and software
(5) support all operating systems and application software, flexible and convenient display<(6) mass production, low cost and easy maintenance.

· can the display be controlled by notebook.
why the graphics card of the notebook computer is built-in.
it is unable to connect with the control system. At present, BOE has a notebook with DVI interface, which can realize the control of the notebook.

· what are the differences between the full-color screen using Nippon tube and the domestic tube except the price<
(1) die: the die is produced independently by Nippon Yat Sen.
generally, the die made in China is made in America or Taiwan
(2) packaging: Japan Asia company has its own packaging, and there is no domestic production factory, but there are many domestic tube packaging manufacturers
(3) consistency: the wave length phase difference of the same batch of Riya tubes is small and the consistency is good, while the consistency of domestic tubes is relatively poor<(4) service life: the service life of Riya tube is relatively long, and the attenuation of domestic tube is relatively serious
· what is the difference between full-color indoor module screen and full-color patch screen
(1) light emitting part: the display module with full color screen is generally yellow green, and the pure green module is more expensive; The chip full-color screen generally uses pure green chip
(2) display effect: the visual feeling of the pixels on the full-color screen of the module is thick, the brightness is low, and the mosaic phenomenon is easy to occur; The uniformity and brightness of the whole color display are good
(3) maintenance: the full-color module is difficult to maintain, and the replacement cost of the whole module is high; The patch is full color, easy to maintain, and can be replaced by single lamp
· can the outdoor screen be pasted with LED and why the installation structure of outdoor screen is strictly required.
theSMD LED can not adapt to the harsh outdoor environment<

· why is the production cycle of outdoor screen long<(1) raw material procurement: the procurement cycle of LED tubes is long.
especially for imported tubes, the ordering cycle takes 4-6 weeks<(2) the production process is complex: PCB design, shell production, glue filling, white balance, etc
(3) strict structure requirements: generally, it is box design, and wind, rain and lightning protection should be considered.

· how to help users choose the appropriate display
(1) the need to display content
(2) confirmation of visual distance and visual angle
(3) screen resolution requirements
(4) requirements of installation environment<(5) cost control
· what is the ratio of length to width of the display screen
graphic screen: it is determined according to the displayed content
video screen: generally 4:3 or close to 4:3; The ideal ratio is 16:9.

how many points can a control system control
communication screen a card: monochrome and bicolor × 64
communication screen B card: monochrome: 896 × 512 two color: 896 × 256
DVI dual color screen: 1280 × 768
DVI full color screen: 1024 × 512
· what factors are generally considered in the size design of display screen<
- there are three important factors in the design of screen size:
(1) the need of display content
(2) space condition of the site<(3) display unit template size (indoor screen) or pixel size (outdoor screen)
-More than 10 kW display screen should be equipped with step-down starting equipment.

- Communication requirements: the communication distance is defined by the length of the communication line.

- the communication line should be installed according to the length standard of the communication line used in the model of the installed display screen.

- it is forbidden to route the communication line and the power line in the same pipe.

- Installation requirements: the display screen should be installed horizontally.
it is not allowed to tilt backward
- hoisting It is necessary to install up and down regulating rods.
- before wall mounting, it is necessary to install forward tilting hook.
- for floor mounting, it is necessary to add positioning support bolt.

· what are the power consumption indicators and power requirements of the display the average power consumption is also called the working power consumption.
it is the actual power consumption at ordinary times.
the maximum power consumption is the power consumption when the display screen is started or full on and other extreme conditions.
the maximum power consumption is the AC power supply (wire diameter, The average power consumption is generally 1 / 3 of the maximum power consumption.

the display screen is a large precision electronic equipment.
in order to use safely and work reliably, The AC220 V power input terminal of the computer or the AC220 V power input terminal of the computer connected with it must be grounded.

note: the AC220 V power input grounding terminal of the computer has been connected with the computer case.

· installation requirements of the display screen
power supply requirements: the power supply wiring point should be within the size of the screen body.
220 V commercial power supply.
live line 0 line grounding wire
380V commercial power supply, three live wires and 10 wire grounding wire
the cross-sectional area of live wire and zero wire is the sameCommunication requirements: the communication distance is defined by the length of the communication line.

the communication line shall be installed according to the length standard of the communication line used in the model of the installed display screen.

it is forbidden to route the communication line in the same pipe with the power line.

installation requirements: the display screen shall be installed horizontally on the left and right.
backward tilt is not allowed
lifting shall be equipped with up and down regulating rod
before wall hanging, it shall be installed with forward tilt The hook should be installed on the ground with positioning support bolts.

what problems should be considered in the design and installation of outdoor screen (1) the display screen is installed outdoors.
it is often exposed to the sun and rain, wind and dust cover, and the working environment is harsh.
the electronic equipment is wet or seriously affected by moisture, which will cause short circuit or even fire.
it will cause failure or even fire, resulting in losses
(2) the display screen may be attacked by strong electricity and strong magnetism caused by lightning<(3) the ambient temperature changes greatly.
when the display screen works, the 32313133353236313431303231363533e4b893e5b19e331333365646263 will generate certain heat.
if the ambient temperature is too high and the heat dissipation is poor, the integrated circuit may not work normally, or even be burned, so that the display system cannot work normally<(4) wide audience, long sight distance and wide field of vision are required; According to the above special requirements,
outdoor display must be:
(1) the screen and the joint between the screen and the building must be strictly waterproof and leak proof; The screen body should have good drainage measures, once the ponding occurs, it can be discharged smoothly<(2) install lightning protection devices on the display screen and buildings.
The main body and shell of the display screen shall be well grounded.
the grounding resistance shall be less than 3 ohm, so that the large current caused by lightning can be discharged in time<(3) install ventilation equipment to reduce the temperature, so that the internal temperature of the screen is between - 10 ℃ and 40 ℃.
install axial flow fan above the back of the screen.
exhaust heat<(4) industrial grade IC chips with working temperature between - 40 ℃ and 80 ℃ are selected to prevent the display screen from being unable to start due to low temperature in winter.

(5) in order to ensure long-distance visibility under strong ambient light.
ultra high brightness LED must be selected<(6) the display medium is a new wide viewing angle tube, with wide viewing angle, pure color, consistent and coordinated, and its service life is more than 100000 hours.
the external packaging of the display medium is the most popular square cylinder with shielding edge at present.
there is no metallized assembly with silicone sealing; Its appearance is exquisite and beautiful, solid and durable, with the characteristics of direct sunlight, dust, water, high temperature and short circuit protection.
when choosing outdoor LED display 32313133353236313431303231363533e78988e69d8331333431343036, the first thing to consider is the screen waterproof protection.
and heat dissipation,

how to choose the right outdoor LED screen.
pioneer general technology teaches you to analyze, screen and compare the four performance characteristics of the screen, so as to buy the right LED screen.

protection level: the outdoor display screen is installed outdoors.
it is often exposed to the sun and rain, wind and dust cover, The working environment is harsh.
the electronic equipment is wet or seriously affected with moisture, which will cause short circuit or even fire.
it will cause failure or even fire,Therefore, the screen body and the joint between the screen body and the building must be strictly waterproof and leak proof; The screen body should have good drainage measures.
once the ponding occurs, it can be discharged smoothly.

two outdoor LED displays may be attacked by strong electricity and strong magnetism caused by lightning.
therefore, the lightning protection device should be installed on the display screen and buildings after selecting the display screen.
the main body and shell of the display screen should be well grounded.
the grounding resistance is less than 3 ohm, The high current caused by lightning can be discharged in time.

heat dissipation and low temperature resistance: the outdoor environment temperature changes greatly.
when the display screen works, it will generate certain heat.
if the environment temperature is too high and the heat dissipation is poor, the integrated circuit may not work normally, or even be burned, so that the display system cannot work normally; Install ventilation equipment to reduce the temperature, so that the internal temperature of the screen is between - 10 ℃ and 40 ℃.
install axial flow fan above the back of the screen.
exhaust heat; Industrial grade IC chips with working temperature between - 40 ℃ and 80 ℃ are selected to prevent the display screen from being unable to start due to too low temperature in winter.

viewing angle and brightness: wide audience area.
the viewing distance and wide field of vision are required; The ambient light changes greatly, especially may be exposed to direct sunlight.
in order to ensure long-distance visibility under strong ambient light.
ultra high brightness LED must be selected; The display medium is a new wide viewing angle tube, which has wide viewing angle, pure color, consistent coordination, and service life of more than 100000 hours.
the external packaging of the display medium is the current popular square cylinder with shielding edge.
there is no metallization assembly with silicone sealing; Its appearance is exquisite and beautiful, firm and durable, with the characteristics of direct sunlight, dust-proof, water-proof, high temperature and short circuit protectionWeb links.
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