The LED luminous characters have the advantages of beautiful daytime, beautiful night, energy saving, long-lasting durability, and can meet the energy-saving and environmentally-friendly urban beautification standards, and quickly become popular with the original. However, the use of light sources in the advertising industry (lighting words) has also produced many unsatisfactory problems.
First, the common problem
1, short service life: the theoretical service life of regular manufacturers is generally about 80,000 hours. Nowadays, many of the luminous characters have not been used enough to replace the modules frequently in a year, which brings a lot of trouble and economic loss to customers and advertising producers.
2, the color decays very fast: the color of the newly installed light word is pure and bright, and the color can be obviously dimmed after less than one year. The font becomes red and red, green and green is very ugly.
3, the color is uneven, the color difference is obvious: mainly in the large-volume luminous characters made of pure white. In the assembly, the performance of the single module is not obvious. After the whole font is assembled, the chromatic aberration is clearly expressed. The whole face is like a map, white, blue and yellow.
4, the font part of the stroke, the whole suddenly does not light or when the light is not bright: after the use of a certain period of time, the partial or entire font elimination starts to flash, when the light is off, it does not light until it is completely off.
5, the font output power is large, energy saving is not obvious.
Second, the solution
Based on the long-term research on the production of luminous characters, we have summarized the more satisfactory methods to understand the above problems:
1. Purchase qualified single lamp granules produced by regular manufacturers (requires the quality parameter description provided by the manufacturer) and make the module by yourself. Don't try to buy a single lamp or a well-made module in the electronics market. If you need to buy a module, you should see that there are several resistors installed on the module. It is best not to use a module that installs a battery. The resistor acts as a current limiting function in the module and is prone to heat. Continuous use for a long time, once the resistor burns out, the module will not light up. The lights are generally not bad. Do not throw away the module, just replace it with a resistor of the same negative value. This saves money for the production unit. In order to reduce trouble and save money, it is best to use a module with two resistors installed. In addition, you should have an understanding of the production facilities of the suppliers who make the modules, and see if they use anti-static facilities when making the modules. If there is no anti-static device attached, even if the resistor is not burnt out during use, the lamp is easily damaged by breakdown.
2, the lamp safe use current is generally 20 mA, beyond this value, although the brightness will increase, but the color attenuation will be significantly faster. Therefore, be sure to test its output current value when purchasing an assembled module. Less than 20 mA is not enough brightness, and more than 22 mA affects the life, which speeds up color decay.
3, white lights must be separated by color separation before leaving the factory (some light that has not undergone splitting and color separation is pure white, some blue, some yellow). The spectrophotometer is expensive, and the general small factory does not have such equipment, so the white light produced is generally obtained by the big factory for color separation. Since it is not a product of its own factory, the separation and separation will not be so careful. Some small factories simply do not separate the light. They generally pull customers at low prices. Therefore, when purchasing white light, do not blindly understand the cheap, be sure to purchase the same manufacturer, the same year batch, the same color number of the light-emitting tube single-particle lamp or module to make the same batch of luminous characters.
4. Most of the lighting modules currently on the market are connected by patch cords. In this way, the advertiser is quick and easy to install the lighting module. However, some new problems have also arisen. Because the connector is easily oxidized by the moisture in the air during long-term use, the contact is poor, and the partial or all circuits are instantaneously powered off or completely powered off, causing the font source to flicker or not bright. The solution is:
(1) When the module is made, the connector is not used, and the copper tinned wire is directly connected and then soldered with activated carbon solder.
(2) The artificial agate is used to make a fully enclosed hollow three-dimensional luminous word to isolate the light source from the air.
5. Try to use a set of five light-emitting modules, so that the number of lights has not changed, and the power is reduced by two-fifths.
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