Outdoor led advertising screen: a clear definition, customized for your preferred Shaanxi Hi-Tech Optoelectronics Technology ..

Outdoor led advertising screen: a clear definition, customized for your preferred Shaanxi Hi-Tech Optoelectronic Technology Co., Ltd. 02,985,453,602 with LED display progressive development, in almost every corner of the world can see the large-scale LED display screen, in general, to the world add color and beautify every city. Also praise the majority of consumers, LED display industry flourished rapidly, also formed a development stage. Which give rise to another question, LED display industry is facing profits are gradually diluted, homogenization of competitive status quo. In the new market structure, getting smaller and smaller spacing, stability higher and higher, more and more high-definition display, the installation has become more and more intelligent LED display enterprises goal. LED display market will usher in what kind of development? Full-color LED display is a new type of electronic media, has irreplaceable advantages in large-size, high brightness, environmental adaptability, can be used for large-size indoor and outdoor large size of graphic, video display, the main used in advertising media, stage sets, building decoration, traffic information, sports stadiums and other purposes. With the LED technique, packaging technology and LED display rapid increase and a further decline in prices of manufacturing technology, full-color LED display is a cost-effective application across the threshold of a huge market applications and requirements. First, the most critical components of full-color LED display dedicated to select full-color LED display is LED devices. There are three reasons: First, LED full-color machine is used in the largest number of key components, will use the thousands to tens of thousands per square meter LED; second, LED is to determine the performance of the entire body of the optical display screen, a direct impact on the audience Evaluation of the display; the third, LED display the largest proportion in the overall costs, ranging from 30-70 percent. LED is the most critical components of full-color LED display, the equivalent of a computer's CPU. LED's choice has been determined more than 50% of the entire display quality. If you fail to choose a good LED, other components of the display can not compensate for even the best display quality defects. Full-color LED display dedicated LED quality and parameters can be attributed to the following five elements: 1, loss of efficiency due to the full-color display by a group of thousands or even hundreds of thousands of red, green, and blue LED pixels composed of dots, any Failure of a color LED display will affect the overall visual effect. In general, according to industry experience in LED display will begin to assemble the failure rate of aging 72 hours before shipment should not exceed ten thousandths (of a failure of the LED device itself causes). 2, the antistatic ability LED is a semiconductor device, sensitive to static electricity, caused by static electricity can easily fail, it is essential to monitor the life of antistatic ability. Generally speaking, LED's body static mode test failure voltage of not less than 2000V. 3, the attenuation characteristics of red, green and blue LED have working time and increases brightness decay characteristics. LED chip's strengths and weaknesses, the quality and level of packaging technology auxiliary material determines the LED decay rate. Typically, 1000 hours, 20 mA at room temperature after the lighting test, the red LED attenuation should be less than 10%, blue, green LED attenuation should be less than 15%. Red, green, and blue fading consistency of full color LED display greatly affect the future of the white balance, and then show fidelity affect the display. 4. Brightness LED brightness is an important determinant of the display's brightness. LED brightness higher, the greater use of current margin of power savings, keeping LED stable good. LED has a different angle, the brightness has been set in the chip case, the smaller the angle, LED is the light, but the viewing angle of the display is smaller. General should be chosen to ensure that the 100-degree LED display sufficient perspective. Different for different point spacing and line of sight of the display, you should find a balance in brightness, angle and prices. 5. Consistency full-color display is composed of numerous pixels of red, green and blue LED composed spell, each color LED brightness, wavelength determines the consistency of the entire screen brightness uniformity, consistency balance , color consistency. Generally, display devices require manufacturers and suppliers to provide 1 5nm wavelength range: the range of 1.3 brightness LED, these indicators can be component suppliers were graded by color separation machine reach. Voltage is generally not required consistency. Since the LED is angled, so full-color LED display also has a directional point of view, that when viewed at different angles, its brightness is incremented or decremented. Thus, the red, green, and blue LED angle consistency will seriously affect the consistency of different angles, white balance, directly affecting the display of video color fidelity. To do the red, green and blue LED brightness variations at different angles to match the consistency, we need to package design, raw material selection on rigorous scientific design, depending on package vendor technology. No matter how good the display method in the direction of balance, consistency is not good if the angle of LED, the entire screen white balance effect different angles will be bad. Consistency characteristic angle LED devices available LED Tester angle measured for the high-end display is particularly important. Second, the full-color LED display dedicated use: quality LED also need a good use and the environment, summed up in the following eight using the points: 1, anti-static screen assembly plants should have good anti-static measures. Special anti-static, anti-static flooring, anti-static iron, anti-static mat, anti-static ring, anti-static clothing, humidity control equipment grounding (especially cut legs) are all basic requirements, and use electrostatic analyzer regular testing . 2, wave soldering temperature and time to strictly control the wave front welding temperature and the furnace, it is recommended as follows: preheat temperature 100 ℃ ± 5 ℃, the maximum does not exceed 120 ℃, and the preheating temperature rise steadily requirements, welding temperature of 245 ℃ ± 5 ℃, welding time recommended no more than 3 seconds after the furnace avoid vibration or shock LED, until the resumption of normal temperature. Temperature parameters of wave soldering machines to regular testing, which is determined by the characteristics of LED overheating or temperature fluctuations will cause direct damage to the LED or LED quality problems, especially for such a small size of 3mm round and oval LED. 3, the design current value LED nominal current of 20mA, is generally recommended to use the maximum current does not exceed 80% of the nominal value, especially for small spacing display, due to poor heat dissipation, but also to reduce the current value . According to experience, due to the red, green and blue LED decay rate inconsistency, targeted to reduce blue, green LED current value to keep the display after prolonged use white balance consistency. 4, LED lamp with a color mixing different brightness profile of need mixed light, or designed in accordance with the discrete law insert lights diagram insert lights, to ensure that the entire screen for each color brightness consistency. This step, if there is a problem, there will be inconsistencies local brightness of the display phenomenon, directly affect the display LED display. 5, the degree of control the vertical line LED lamp is for when the furnace have enough technology to ensure the LED perpendicular to the PCB board. Any deviation will affect the already set the LED brightness uniformity, brightness inconsistent color. 6, thermal design LED work will heat temperature will affect LED decay rate and stability, so the thermal design of PCB, cabinet ventilation design will affect LED performance. 7, Weld control LED display LED is not lit in the event, often more than 50% probability caused by various types of Weld such as LED pin Weld, IC lead Weld, Pai Pai mother Weld and so on. Improve these problems requires strict to improve the process and strengthen the quality inspection to solve. Vibration test before leaving the factory may well be a good test. 8, the drive circuit board driver circuit design on the display driver IC module arrangement will affect the brightness of the LED. Since the driver IC output current board PCB transmission distance too far, will make the transmission path pressure drop is too large, affecting the normal operating voltage of the LED lead to decrease in brightness. We often find around the LED brightness of the display module is lower than the middle of some, it is the reason. Therefore, to ensure consistency of display brightness, we must design a good driver circuit distribution. This article is excerpted Chinese LED display network http://www.cnledw.com/inter/show-8- Nine One One Ba Lu Qi .htm