The LED luminous word common problem solving methods in the making
Bright LED light-emitting character has a beautiful during the day, night, save electricity and energy saving, durable lot of advantage, and can satisfy the energy saving and environmental protection standard of city beautification, run amok in the rapid ascent. However, the light source used in advertising industry ( Luminous words) Production, also appeared a lot of unsatisfactory problems. A, common problems
1, short service life: formal manufacturers theory is usually about 80000 hours service life. Now many luminous word useless year began to frequent replacement module, enough to clients and advertising are brought a lot of trouble and economic losses.
2, color decay very fast: just install good luminous word color pure and bright, can use the color dim significantly in less than a year. Font become red not red, green green is very ugly.
3, uneven color, color difference obvious: mainly made in pure white large luminous word. As a single module assembly is not obvious, after complete assembly, the font color is clearly shown, the literal, like maps, a piece of white and a blue, a yellow.
4, integral part of the stroke and font suddenly not bright or when light when the dawn: light-emitting character in use after a period of time the local or the whole font selection started to flicker, when light when the dawn, until completely not bright.
5, font bigger output power, save electricity and energy saving is not obvious.
2, solution
we made according to the long-term luminous word study, summarizes the method to understand these problems more satisfactory:
1, the purchase of normal manufacturer production of qualified single lamp granule ( Requires manufacturers to provide quality parameters) And make your own modules. Do not covet is cheap in the electronic market to buy single lamp grain or has made a good module. If you want to buy modules, should see modules installed on a few resistance, to install a electric Yin don't use the module. Resistance in module is current limiting function, it is easy to heat. Long time continuous use, once the resistance to burn out, this module is not lit up. Lamp does not generally bad. Don't throw away module, need to replace a same Yin value resistor can be normal use. This can be to cut costs and production units. In order to reduce trouble, save money, had better choose to install two resistance of the module. In addition, the module of the supplier's production facilities to understand something, whether its in making module adopted antistatic facility. If there is no additional antistatic facility, in use even if the resistance is not burn out, light is easy to be broken down.
2, lamp safe use current generally to 20 ma, more than this value, while the brightness will increase some, but the color can significantly accelerate the attenuation. So, when buying has assembled module must test the output current value. Less than 20 ma brightness is not enough, more than 22 ma affect life, make the color attenuation speed up.
3, white lights go through testing before they go out, Without testing some of the light is pure white, some partial blue, some yellow) 。 Testing instrument is expensive, general small plant no such equipment, so the production of white light are generally get the company for testing. Because is not their own factory products, testing is not so careful. Some small factory simply don't spectral color separation. They are generally low prices to customers. Bai Guangshi don't blindly buy so the taste is cheap, must buy the same manufacturer, year after year the same batch, same quality, the luminous tube single grain lights glowing or module to make the same batch of words.
4, now in the market sales of the light-emitting module, mostly using plug wiring connections. In this way, advertising manager when installing a luminous module conveniently. But also appeared some new problems, because the splice pieces during long time use of corroded by the moisture in the air is easy to lead to poor contact oxidation, make partial or whole circuit instantaneous power or power thoroughly, result in font light blinking or not bright. The solution for:
( 1) Module is no connectors, with copper tin directly using activated carbon after soldering welded wire connection.
（ 2) Made all man-made agate closed hollow three-dimensional light-emitting word, isolated from contact with air.
5, try to use a set of five lamp luminous module, the number of this lamp is not change, while reducing power by two 5.