High quality led display
also need a good method of use and the environment, in the aggregate, have used the following eight points: 1, anti-static led display assembly plant should have a good anti-static measures.
Special anti-static, anti-static floor, antistatic soldering pen, static radio pad, anti-static, anti-static clothing, humidity control, equipment grounding (
Especially cut foot machine)
Are the basic requirements, and to use the static all tested periodically.
2, wave soldering temperature and time are required to strictly control the wave crest welding temperature and furnace time, recommended for: preheat temperature 100 ℃ + / - 5 ℃, the highest do not exceed 120 ℃, and the requirement of preheating temperature increasing is smooth, the welding temperature is 245 ℃ + 5 ℃, welding time suggest no more than 3 seconds, after furnace vibration or shock led display of avoid by all means, until the normal temperature state.
Crest welder regularly test the temperature of the parameters, which is determined by the characteristics of the led display, overheat or fluctuations in temperature will directly damage the led display or led display quality hidden trouble, especially for small size, such as 3 mm, round and oval led display.
3 led display and design of the current value of the nominal current of 20 ma, general advice its maximum current for no more than 80% of the nominal value, especially for led display point spacing is small, due to the poor heat dissipation condition, also should reduce current value.
According to experience, because the red, green, and blue led display attenuation speed inconsistencies, targeted to reduce the current value of blue and green led display, in order to keep the consistency of the led display after long time use white balance.
4, mixed lights the same colors in different brightness of led display need to mix light, or in accordance with the law of discrete design of plug light figure to plug the lamp, to ensure the consistency of the whole screen brightness of each color.
If there is a problem, the process will appear local brightness led display inconsistent phenomenon, directly affect the led screen, led display display effect.
5, verticality control lights for upright type led display, there should be enough when a furnace technology ensure the led display is perpendicular to the PCB.
Any deviation will affect the already set a good led display brightness uniformity and brightness of color piece.
6, heat dissipation design led display working when heating, high temperature will affect the attenuation speed and stability of the led display, so the heat dissipation of PCB design, the enclosure ventilation cooling design will affect the performance of led display.
7, virtual welding control led display led display in the led display screen is not bright, often more than 50% probability for the various types of virtual welding, such as the led display pins virtual welding, IC pin virtual welding, welding and row needle row, etc.
The improvement of these issues need to improve process strictly and strengthen the quality inspection to solve.
The vibration test before delivery also can yet be regarded as a kind of good test method.
8, led display module drive circuit design of driver circuit board driver IC configuration will affect the brightness of the led display.
Due to the driver IC output current on the PCB board transmission distance too far, will make the transmission path of pressure drop is too large, affect the normal work of the led display voltage results in the decrease of its brightness.
We often find the led display brightness around the led display module is lower than the middle, it is for this reason.
So to ensure the consistency of the led display brightness distribution of its driving circuit is designed.
are important in ensuring led screen
supplier, and the machine is utilised by everyone from led video wall manufacturers to led screen supplier.
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