LED’s luminous color and efficiency is related to the production of LED’s materials and processes,Now the Widely used red, green, and blue. Because the LED’s voltage is low (only 1.5-3V), LED can show the different colors power by low voltage which itself has impact-resistant, anti-vibration, long life (100,000 hours), so in large led display device,There is no other display way can match with led display board.

The most critical parts of Full color led display is LED. For three reasons:

First, LED is the largest number of key components that used for full color led display screen, the number is several housands leds per square meter. For example, ph10mm 2R1G1B, the density is: 10,000 dots/m2, and each dots have 2 red led, 1 green led,1 blue led. so for ph10mm 2R1G1B, we use 40,000 leds/m2.

Second, LEDs determine the optical properties of the whole led display panel, it affect the evaluation of viewer whom we will show the advertising to;

LED is the most critical components for led display sign, it equals to a computer CPU. LED options have been decided more than 50% of the entire quality of the led digital display. If you can not choose a good LED, the other parts of led display panel can not make up for deficiencies no matter how good the quality they are.

The red and green LED produced as a pixel color led display screen;we call double color led display or dual color led display, the red, green, and blue LED(RGB) as a pixel color led screen,then we call full color led display or color led display.Whether using LED for monochrome led sign, dual color led display or full color led screen,if we want to display images then we need to adjust the luminance and intensity of each LED, the adjustment of the level is the gray scale. The higher gray level, then can showing images of the more delicate, the color has more abundant, and the corresponding led display control system is also more complex. Generally, 256 gray scale images, color transition will be very soft, while the 16-level grayscale color image, color transition line is very obvious. Therefore, the full color LED screen have to require 256 gray scale.

LED Display’s Working Principle

led display screen is a High-tech products that optical and computer technology in one.

LED product’s performance characteristics

led video display should have: animation features. Required LED display’s dots corresponding to the same area showing of computer’s monitor, we can it dot to dot with controlling PC. The function of text led display. Required text display stable, clear crosstalk; grayscale function. it Requires a detailed specification in the levels specified in gray. TV led video display except with animation, text display, grayscale functions, should be able to show the TV, s-videos,dvd players. rental led display aslo need the function to show the Live show,with hanging installation for different applications,and flight case for easy transportation.

LED display can be classified according to the following conditions:

1. By The Usage of the environment, it classified to outdoor led display and indoor led display.

2.By the Display color,it is divided into single-color LED display, dual-color LED display and full-color LED display. By gray-scale level,it can be divided into 16,32,64,128,256 gray LED display panels.

3.By led display board performance,it isdivided to led message signs, graphic LED display, computer led video display ,TV LED video display,led information display,etc.

4.indoor LED display be used for single color led sign, it can be divided into ph3mm,ph4mm,ph5mm,ph6mm,ph7.62mm,ph8mm,ph10mm,ph12mm,ph16mm,ph20mm; outdoor LED displays by using pixel pitch,it can be divided into: ph8mm,ph10mm,ph12mm,ph16mm,ph18mm,ph20mm,ph25mm,ph30mm,ph31.25mm,ph40mm.

led displays- Five elements to inspect the specific quality and parameters of led display screen:

1, failure rate

As color led display is composed to the group of thousands and even hundreds of thousands of red, green, and blue LED pixel,The failure of any color LEDs will affect the overall visual effect of led display wall. In general, according to industry experience, In the beginning of LED display assembly to the aging of 72 hours before shipment should be no higher than three ten thousandths failure rates (defined as the LED itself causes failure).

2, anti-static capability

LED is a semiconductor device tha is sensitive to static electricity, static electricity can easily lead to failure, The anti-static capability is essential to the life of the led display screen. In general, LED failure of human static model test voltage should be less than 2000V.

3,Attenuation characteristics

The LED’s brightness decay rate depends on Advantages and disadvantages of LED chips, auxiliary materials and packaging technology good or bad . In general, the 1000 hours, 20 mA at room temperature after the light testing, the red LED should be less than 10% attenuation, blue, green LED of the attenuation should be less than 15%. Red, green, blue attenuation consistency have the great influence on future white balance for color led display, thereby it affect the color’s fidelity of the led display sign.

4,Brightness

LED brightness is an important determinant of the led display board’s brightness. The higher LED brightness, the greater use of current margin of saving power, good stability to maintain LED. LED has a different point of view the value of the chip where the brightness has been set, the smaller the angle, LED, the more light, but the smaller viewing angle of led display panel. Generally,we should make sure the led display board has the viewing angle of 110 degree horizontal and 70 degree vertical,of course,different space and different application, should find a balance point on the brightness and viewing angle.

For example, 100 square meters of PH20 outdoor led display, in accordance with the use of 14 hours a day, 365 days a year calculation. Energy-efficient than conventional led display panel to conserve electricity year hundreds of thousands of degrees, assuming that industrial use of electricity in accordance with 1 yuan / degree calculation, then the annual electricity savings in more than 100,000 yuan, that is to save electricity per square meter 1,000 yuan annual above.

A new generation of energy-saving LED video display at the same time have the following outstanding properties:

1. With a single point of brightness and color correction, brightness uniformity of ≤ 5%
2.64-order programmable current gain adjustment, on-line single-point detection
3.16 for data processing, the brightness is lowered without loss of gray-scale.
4. The new mask design, no dust is not water, the entire screen in terms of black bright screen, when there was no detectable module feeling
5. With a temperature control function, effectively improve the cooling fan efficiency
6. Upgraded version of full-color control system.

We can supply you the full solutions for Mobile LED Display Screen.

mobile led display rentals are available for both private and corporate functions. Outdoor LED Display give you the ability to host a rocking party, unique lifetime event, or revenue-generating advertising or paid event.

Specifications and Advantage:
1.High resolution,and Wide Viewing angle and Long viewing distance.
2.Self contained whisper-quiet generator.
3.Weather-proof outside display screen; run day or night, inside or out, rain or shine.
4.Basic AV playback equipment including DVD, Computer, VHS sources and Audio.
5.Units are highly mobile, set up quickly and easily, and can be moved easily to be used throughout event locations and venues. Giving you unlimited access!

To get more information about truck led display,please Contact us!

At present, LED has become a global scramble led products to compete in an emerging industry “commanding heights.” And Shenzhen as China’s first to enter the LED industry city, after nearly 10 years of cultivation and development, the city engaged in LED display lighting technology research and development, production and LED application of more than 900 enterprises have become the nation’s largest cluster of LED products. From the upper reaches of the substrate material, epitaxial wafers, chip midstream and downstream packaging, led display application and supporting materials, processing and testing equipment, and other aspects, Shenzhen LED industry has formed a complete industrial chain. Last year, the Shenzhen municipal government to seize the opportunity, will not only focus on the development of LED industry in the future as a major new industry, but also from the first half of 2009 until recently, successive introduced including Shenzhen LED “industrial planning”, support measures, including 3 copies of “official documents” and decided to spend the next three years, more than 200 million yuan, a strong boost LED industry, urged its bigger and stronger.

LED display board is playing an important role in led display industry, outdoor led display can be used for led billboard beside the highway for advetising, and Mobile led display can be used for portable advertising use. it become more and more popluar in our life. Even the Indoor LED Display can be used for LED TV, different exhibition like fashion show,automobile fair,etc..let us show your ideas with the amazing led display products.

DisplaySearch believes that manufacturers and brand manufacturers in the panel joint efforts in 2010 in the third quarter LED-backlit display board will exceed 22% of the market share.

2. Power consumption and power requirements
The screen is divided into the average power consumption and maximum power consumption. The average power consumption is also called the work is usually the actual power consumption. Maximum power consumption is a startup or extreme conditions such as full-light power consumption when maximum power is alternating current power supply (diameter, 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 supply input connected to the computer or its input AC220V power supply must be grounded.
Note: Your computer’s power supply input AC220V ground terminal has been connected with the computer chassis.

3. Outdoor screen issues should be considered
Outdoor screen main issues are as follows:
(1) screen installed in the outdoors, often exposed to the sun and rain, wind and dust cover, poor working environment. Electronic equipment is wet or damp can cause serious short-circuit or even fire, cause failure or even fire, resulting in losses;
(2) The screen may be caused by the strong electric magnetic thunderbolt attack;
(3) The ambient temperature changes significantly. Display work itself, we should have some heat, if the ambient temperature is too high and the heat also poorly integrated circuits may not work correctly, or even burned, making display systems do not work;
(4) Shouzhong Mian wide and far-sight requirement, wide field of vision required; ambient light changes, in particular, may be subject to direct sunlight.

1, anti-static for LED Video display

     LED Display assembly plant should have a good anti-static measures. Special anti-static and anti-static flooring, anti-static soldering iron, anti-static Taiwan pad, anti-static ring, anti-static clothing, humidity control, equipment grounding (especially the foot-cut machine) are the basic requirements, and regular use of electrostatic detection instrument .

2, Wave soldering temperature and time for Outdoor led display

     To strictly control the solder wave front of the furnace temperature and time have been proposed as follows: preheating temperature 100 ℃ ± 5 ℃, the maximum does not exceed 120 ℃, and the preheating temperature rise for a smooth, welding temperature of 245 ℃ ± 5 ℃, welding time does not recommend more than three seconds, after the furnace must not have been the impact of vibration or LED, until the restoration of normal temperature state. Wave soldering machine to regular testing temperature parameters, which is decided by the characteristics of LED, and overheating or temperature fluctuations will directly damage the quality of LED or LED hidden dangers, especially for small size, such as 3mm round and oval-shaped LED.

3, The design of current LED Display sign

     The nominal LED current is 20mA, the maximum use of general recommendations for the current nominal value of not more than 80 percent, especially for small screen space point, as a result of poor thermal conditions, but also reduce the current value. Based on experience, as the red, green and blue LED decay rate of the inconsistency, targeted to reduce the blue and green LED’s current value, in order to maintain white balance after the prolonged use of display consistency.

5, Mixed light for LED Display board

     With a different color LED brightness profile of the need for mixing light, or designed in accordance with the laws of discrete interpolation interpolation map lights lights, the entire screen in order to ensure the consistency of the brightness of each color. If there are problems in this process, there will be Indoor LED display brightness inconsistent local phenomenon, a direct impact on the effect of LED display screen.

5, Control of vertical light for LED Display panel

     LED for the line, the heaters have sufficient technology to ensure perpendicular to the PCB board LED. Any deviation will affect LED brightness has set a good consistency, the color appears inconsistent brightness. 

    6, Thermal design for RGB led display

     LED work at the fever, the temperature is too high attenuation LED will affect the speed and stability, so the heat PCB board design, thermal design of ventilation box will affect the performance of LED.

     7,Loose Soldering control for led display factory

     LED display in the LED does not shine, they often have more than 50% probability for all types of  Loose Soldering caused, such as the LED pin Loose Soldering, IC pin  Loose Soldering, Pai Pin  Loose Soldering such as the mother. The improvement of these issues need to strictly improve the process and to strengthen quality inspection to resolve. Vibration in front of the factory is quite a good test. 

    8, Driver circuit design for led screen

     LED Display module on board the drive arrangement drives also affect the brightness of the LED. As the drive output current in the PCB board transmission distance too far, will make transmission path pressure drop is too large, the impact of the normal LED operating voltage to reduce its brightness. We often find that the LED display module brightness around the middle lower than that for this reason. Therefore, to ensure consistency of display brightness, it is necessary to design a good distribution of drive circuit. ]]> http://www.unit-led.com/blog/2009/08/the-led-for-full-color-led-display-screen/feed/ 0 http://www.unit-led.com/blog/2009/07/esd-for-led-display-screen-manufacturing/ http://www.unit-led.com/blog/2009/07/esd-for-led-display-screen-manufacturing/#comments Thu, 23 Jul 2009 06:35:48 +0000 admin http://www.unit-led.com/blog/?p=195 The Electro Static Discharge of the LED Display Manufacturer: