LED Display Lighting

August 4, 2009

LED Display Luminance and Color Uniformity

Filed under: LED Display Screen, LED Technology — Tags: , , , , , , , , — admin @ 12:44 am

LED Display Manufacturer for Luminance and Color Uniformity:

1. When we Manufacture LED large display, the first choice in accordance with the brightness of LED indicators or led display module, followed by the choice of products based on red, green and blue color brightness than to determine what kind of color as the base, the general is a low brightness, as Benchmark light, when the benchmark has reached a maximum brightness, the adjustment of another (color) or two (full color). When two-color led display screen is in most cases to green as the base, adjusting the red diode current. General is to reduce the operating current to balance the color yellow for the adjustment of standards, this should reduce the brightness of the led  video display screen. To display the best color balance adjustment, you will reduce the led screen brightness. If the led RGB display brightness in order to achieve the requirements of each color have a maximum brightness, then lost the balance of colors, such as: two-color screen reddish yellow, or green side.
Low-level TTL output is about 0.4V, for irrigation if the current input, modify it by adding the maximum normal current 35mA, when more than this current, the output low-level increased, with the increase in current, constant low-level output higher output voltage that is greater than 0. 4V circuit is still working correctly. Show circuit in the scan, the working current of 20mA to meet the requirements of control of red, because red is relatively high brightness LED; green LED is higher than the operating current 20mA, current about 30 ~ 50mA in between, at this time, 74HC595 output voltage should be increased, because there 74HC595 output resistance, and non-linear change.
2. Dynamic scanning circuit scans, static-driven manner. Display by the display module to scan the frequency of structural limitations, each module there are 8 × 8 months LED display the entire line of data of all modules in series, the data is updated once a long time, when the scanning frequency of 100Hz, the entire led screen brightness will be reduced. If the lower screen of the scanning frequency, indicating lower brightness. Experiments show that sweeping depiction of the relationship between frequency and the color is relatively small.
So,After two-color LED display on the design and analysis, the effective adjustment of the technical parameters of the circuit, to be a better led display sign. Facts have proved that the rational analysis of the technical characteristics of the circuit, so that the work of the best circuits in the state, will be able to achieve the desired effect. 74HC595 companies choose a different circuit, different effects, in a led full color display of as much as possible to choose the same circuit, to avoid influence by the circuit parameters showed different results.
LED display board design and manufacturing is an important condition for the cost of production, therefore, the choice of components in the process of meeting the requirements, select the price low. In this paper the technical design and analysis on the basis of the circuit will adjust to display the best effect, to create a performance / price ratio of the led display panel, with market competitiveness.

August 3, 2009

The LED for Full color led display screen

Filed under: LED Display Screen, LED Technology — Tags: , , , , , — admin @ 12:02 am
A good environment for the use of methods and the LED for high-quality long-term maintenance LED Display Screen  is also very important:

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.

July 22, 2009

ESD for LED Display Screen Manufacturing

Filed under: LED Display Screen, LED Technology — Tags: , , , , , — admin @ 11:35 pm

The Electro Static Discharge of the LED Display Manufacturer:

In recent years, LED display technology in our country matures, applications become the trend of widespread and universal. However, most manufacturers of LED display production is not yet fully equipped with the real capacity of these products, which products to the LED display Screen has hidden, and even affect the entire market. How to standardize the production, how to produce the true sense of the low attenuation, long-life LED Video display of products? In this paper, the production process from the Outdoor LED display electrostatic protection point of view, to discuss the process and the harmful effects of the electrostatic protection methods.

The Reason of ES(Electro Static):

From the micro level that, according to atomic physics theory, when the material in a neutral state of equilibrium, electric, electronic material due to different contacts of the gains and losses arising from electronic to physical loss of power balance, the phenomenon of static electricity.

From a macro perspective, the reasons are: the friction heat between objects to stimulate electron transfer; object contact and separation between the resulting electron transfer; electromagnetic induction caused by the imbalance of surface charge distribution; friction and the combined effect of electromagnetic induction.

Electrostatic voltage is from different types of material separated from each other and have contact with. This effect is well-known friction from electricity generated by friction between the voltage depends on the characteristics of the material itself. As the LED screen in the actual production process is the human body and related components of the direct contact and indirect contact with static electricity. Therefore, in accordance with the characteristics of the industry we can do a number of targeted preventive measures electrostatic

So,When you check the LED Display manufacturer  you need to check there ESD equiment, if they pay more attention on ESD for the LED Display Screen, you will have a more reliable quality and long lifetime LED Display Panel for your Advertising!

July 21, 2009

The Capability Of LED Display Screen Control

Filed under: LED Display Screen, LED Technology — Tags: , , , — admin @ 7:07 pm
This Article is to describe the capability of LED Display Control System
1.LED Screen in the design and production will be fully taken into account the characteristics of the local climate and environment, in order to improve product reliability, the Company to ensure that the components in the rated temperature range of use, large LED screen with good ventilation cooling performance, and has dust-proof, anti – salt spray, mildew, anti-static electricity, lightning protection and other functions.
2, A high standard of LED display control system:
A, the gray level of world-class control technology, with a capacity of 4096 gray-scale LED  display processing and video noise reduction.
B, with the display scanning frequency of 300HZ.
3, The stability of high-quality LED Video display:
Our company have many years of LED software and hardware development experience in the video receiver circuits, memory circuits, high-speed read and write circuits, LED display control circuit in the scan have been conducted to deal with interference and ensure uninterrupted signal.
A, through the network connection screen, remote control and easy to use.
B, signal transmission cable using a dedicated computer communication cable (in line with the standard RS-422A), the realization of the computer screen body and the synchronous communication.
C, text: text to play a wide range of various fonts, font and text messages, but also achieve the flip, move, spin, snow, scroll, blinking, etc. more than ten kinds of LED  display Panel.
D, computer image information: You can play different formats of graphics, image files. Such as: BMP, TGA, TEXT, GIF and so on.
E, Animation: can play with ANIMATORPRO, 3DStudio software produced by the second, three-dimensional animation, and supports the use of compression of the AVI signal acquisition cards, sea Sheng interface package with convenient interface, a wealth of material, physical libraries, and advanced rendering technology, can produce high-quality three-dimensional animation, creative advertising to become the reality of life.
So,When you are looking for a LED Advertising Display, LED Control system is important for the reliable and Clear Image Showing.

July 20, 2009

The Character of LED Display Control System

Filed under: LED Display Screen, LED Technology — Tags: , , — admin @ 7:47 pm

The LED Display Control System’s Character and Diagram:

led-display-control-system

1, LED Display is to play with the screen text, two-dimensional / three-dimensional animation, video programs, flexible way to play, easy to operate.
2, LED Display Screen with PC hardware access control and two synchronous mapping work. PC access control to support the electronic screen of arbitrary specifications, types of information display and broadcast; hardware synchronization support electronic mapping and computer-screen VGA display simultaneously. VGA display content (such as text, animation, multimedia, video) at the same time in the LED electronic display screen to provide 4-way video input signal (one with S-VIDEO signal), VCD / LD / VIDEO / TV or other equipment NTSC / PAL signals can be directly split from the host control, brightness, contrast, color saturation, the volume adjustable.

July 19, 2009

New Pattern LED Production Technology

Filed under: LED Technology — Tags: , , — admin @ 11:58 pm
New Pattern LED Production Technology for LED Display Lighting Industry.
Chinese Academy of Sciences, Changchun Institute of Optics, Fine Mechanics and Physics on November 14 in Changchun announced that after 10 years of scientific research, they successfully developed the world’s first “integrated three-in-one” type LED display, this new technology will change the current LED displays screen the world market by the “three-in-one table paste” the dominant pattern.
It was learned that the LED Video Display ’s core technology is a completely independent intellectual property rights “for large-scale mass production of LED display Screen brightness, color-by-point correction of the same technology” to subvert the results of previous international LED display panel design, making China the world’s first stand in the forefront of LED display industry.
According to industry, currently in the world market dominated by “three-in-one table paste” LED display, and its shortcomings are: the use of table affixed to the LED display technology, in the production process to go through the one-tube packaging and the second two welding processes, welding of the second more stringent temperature requirements. High temperature die easily damaged, the temperature is too low loose soldering easily. Second welding in the manufacturing process in the production of high precision equipment, welding temperature, surface mounting machine for precision and use of welding materials, board thickness, etc. have a great impact on its reliability.
So, let us looking forward to this new led technology for LED Display Lighting industry. it will be a great to energy saving, and a good furture for Green world.
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