Installation should pay attention to what the led big screen
In recent years, outdoor led display installed more and more, and the area is growing, and some people will always occur when you install some flaws, especially beginners, leading led display is not working, then, Henan led large-screen installation should pay attention to it?
Led the big screen when installing the first to insist on the correctness of the connection, followed by computer software installed is to uphold the integrity and so should also note the following points:
1. Observe the "User Manual" in the procedure;
2. Temperature proper temperature requirements: Operating temperature -20 degrees C≤t≤80 degrees C; Storage temperature -40 ° C degrees C≤t≤60
3. moisture, humidity requirements: the highest operating temperature, led the big screen should be less than 92% relative humidity
4. The power supply to meet the requirements; led screen power supply voltage: 220V ± 10% Frequency: 50HZ ± 5%; secure land access to reliable, ground zero line isolation and reliable access to power away from the high-power electrical equipment.
2014年12月29日星期一
2014年12月23日星期二
Change led display brightness methods
With LED display more widely, LED outdoor advertising display applications that much attention, people are slowly on the inherent characteristics of the cognitive LED display has deepened. The passers-by and drivers who have recently reflected high brightness problems, mainly reflected in the eyes feel uncomfortable for pedestrians, shaking the driver's eyes, the impact of sleep and so on. In order to make the city away from the high brightness LED display problems, LED display manufacturer YUCHIP Electric proposes two solutions: to re-adjust the LED display brightness and color.
First, adjust the brightness
1, change the current through the LED, LED tube to allow continuous ordinary tasks around 20 mA current, in addition to the red LED has a saturation phenomenon, the current is proportional to the rest of the LED brightness is basically flowing.
2, pulse width modulation (PWM), frequency of use of the human eye can feel the change, with the pulse width modulation method to achieve gray scale control, i.e. periodically changing the optical pulse width (i.e. duty cycle), only the repeated cycle of light short enough (ie, refresh frequency is high enough), the human eye is not feel light-emitting pixels trembling. Because the pulse width modulation is more suitable for digital control, it has been made very wide use. Common method is adopted to provide computer LED display. Almost all of the LED screen is adopted to control the pulse width modulation gradation.
Second, the color adjustment
LED display products are based on red, green and blue colors of the LED brightness to adjust the color of the entire screen. We determined according to the selected product of red, green, and blue color which color is brighter than the reference, generally is a low luminance as a luminance ratio of a reference, when the reference has reached a maximum brightness, adjust another species (color) or both (full color). Color display screen is, in most cases with reference to green, red diode operating current adjustment. Generally lower operating current in order to balance the color yellow for the adjustment of the standard, so we must reduce the brightness of the entire display screen. The color display is adjusted to the optimum balance of state, will reduce the brightness of the screen. If the brightness of the display screen in order to achieve the requirements, each color will reach maximum brightness, then lost his balance and color, for example: reddish yellow color of the screen, or greenish.
First, adjust the brightness
1, change the current through the LED, LED tube to allow continuous ordinary tasks around 20 mA current, in addition to the red LED has a saturation phenomenon, the current is proportional to the rest of the LED brightness is basically flowing.
2, pulse width modulation (PWM), frequency of use of the human eye can feel the change, with the pulse width modulation method to achieve gray scale control, i.e. periodically changing the optical pulse width (i.e. duty cycle), only the repeated cycle of light short enough (ie, refresh frequency is high enough), the human eye is not feel light-emitting pixels trembling. Because the pulse width modulation is more suitable for digital control, it has been made very wide use. Common method is adopted to provide computer LED display. Almost all of the LED screen is adopted to control the pulse width modulation gradation.
Second, the color adjustment
LED display products are based on red, green and blue colors of the LED brightness to adjust the color of the entire screen. We determined according to the selected product of red, green, and blue color which color is brighter than the reference, generally is a low luminance as a luminance ratio of a reference, when the reference has reached a maximum brightness, adjust another species (color) or both (full color). Color display screen is, in most cases with reference to green, red diode operating current adjustment. Generally lower operating current in order to balance the color yellow for the adjustment of the standard, so we must reduce the brightness of the entire display screen. The color display is adjusted to the optimum balance of state, will reduce the brightness of the screen. If the brightness of the display screen in order to achieve the requirements, each color will reach maximum brightness, then lost his balance and color, for example: reddish yellow color of the screen, or greenish.
LED electronic display briefly the main production process
LED electronic display uses a low-voltage scan driver with low power consumption, long life, low cost, high brightness, large viewing angle, viewing distance, waterproof, specifications varieties, etc., to meet a variety of different scenarios demand, prospects are very bright, is recognized as the most potential for growth is the fastest growing market for LED applications. In the future the demand for new large-scale sporting events, etc., will promote the development of large-scale LED display. In addition, has erected a large LED display screen every 10 years after the first wave of replacement will be, with the improvement of people's living standards, outdoor led display will be gradually used in various industries.
The following is a brief introduction of the main LED electronic display production process:
a) Cleaning: ultrasonic cleaning PCB or LED support, and drying.
b) mounting bracket: the LED die (wafer) bottom electrode silver paste prepared after the expansion, the die (wafer) after the expansion thorn crystal placed in the table, under the microscope with thorn crystal pen will die mounted on a PCB or LED bracket corresponding pad, followed by sintering the silver adhesive curing.
c) bonding: aluminum wire or a gold wire electrode connected to the LED die to leads for current injection. LED mounted directly on the PCB, and the general use of aluminum wire welder. (Making white TOP-LED need gold welder)
d) Packaging: By dispensing with epoxy to the LED die and wire bonders protected. PCB board dispensing, the shape of the colloid cured, there are strict requirements, which is directly related to the brightness of the backlight of the finished product. This process will also assume the point of phosphor (white LED) task.
e) Welding: If the backlight is SMD-LED or other encapsulated LED adoption in the assembly process, you need to LED soldered to the PCB.
f) cutting film: punch die backlight required for a variety diffusion film, reflective film.
g) assembly: According to drawings, various backlight manually install the correct material position.
h) Test: Check backlight optical parameters and light uniformity is good.
The following is a brief introduction of the main LED electronic display production process:
a) Cleaning: ultrasonic cleaning PCB or LED support, and drying.
b) mounting bracket: the LED die (wafer) bottom electrode silver paste prepared after the expansion, the die (wafer) after the expansion thorn crystal placed in the table, under the microscope with thorn crystal pen will die mounted on a PCB or LED bracket corresponding pad, followed by sintering the silver adhesive curing.
c) bonding: aluminum wire or a gold wire electrode connected to the LED die to leads for current injection. LED mounted directly on the PCB, and the general use of aluminum wire welder. (Making white TOP-LED need gold welder)
d) Packaging: By dispensing with epoxy to the LED die and wire bonders protected. PCB board dispensing, the shape of the colloid cured, there are strict requirements, which is directly related to the brightness of the backlight of the finished product. This process will also assume the point of phosphor (white LED) task.
e) Welding: If the backlight is SMD-LED or other encapsulated LED adoption in the assembly process, you need to LED soldered to the PCB.
f) cutting film: punch die backlight required for a variety diffusion film, reflective film.
g) assembly: According to drawings, various backlight manually install the correct material position.
h) Test: Check backlight optical parameters and light uniformity is good.