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Solarbrite™ Light Emitting Diode (LED) Technology


A light-emitting diode (LED) is a semiconductor device that emits incoherent monochromatic light when electrically biased in the forward direction. This effect is a form of electroluminescence. The color depends on the semiconducting material used, and can be near-ultraviolet, visible or infrared.

A LED is a special type of semiconductor diode. Like a normal diode, it consists of a chip of semiconducting material impregnated, or doped, with impurities to create a structure called a pn junction. Charge-carriers (electrons and holes) are created by an electric current passing through the junction, and release energy in the form of photons as they recombine. The wavelength of the light, and therefore its color, depends on the band gap energy of the materials forming the pn junction. A normal diode, typically made of silicon or germanium, emits invisible far-infrared light, but the materials used for a LED have band gap energies corresponding to near-infrared, visible or near-ultraviolet light.

Unlike incandescent bulbs, which can operate with either AC or DC, LED's require a DC supply of the correct polarity. When the voltage across the pn junction is in the correct direction, a significant current flows and the device is said to be forward biased. The voltage across the LED in this case is fixed for a given LED and is proportional to the energy of the emitted photons. If the voltage is of the wrong polarity, the device is said to be reverse biased, very little current flows, and no light is emitted.

Conventional LED's are made of inorganic minerals such as:

  • aluminum gallium arsenide (AlGaAs) - red and infrared

  • gallium arsenide/phosphate (GaAsP) - red, orange and yellow

  • gallium nitride (GaN) - green

  • gallium phosphate (GaP) - green

  • zinc selenide (ZnSe) - blue

  • indium gallium nitride (InGaN) - blue

  • silicon carbide (SiC) - blue

  • diamond (C) - ultraviolet

LED development began with infrared and red devices, and technological advances have made possible the production of devices with ever shorter wavelengths.

Blue LED's became available in the late 1990s. They can be added to existing red and green LED's to produce white light. Most "white" LED's in production today use a blue LED chip covered by a scintillate coating made of Zinc solenoid (ZnSe). The LED chip emits blue light, part of which is converted to yellow by the ZnSe. This mixture of blue and yellow light creates the impression of white - hence the bluish or yellowish tint that these diodes usually exhibit.

The most recent innovation in LED technology is a device that can emit ultraviolet light. When ultraviolet light illuminates certain materials, these materials will fluoresce or give off visible light. White light LED's have been produced by building ultraviolet elements inside material that fluoresces to produce white light.

The semiconducting chip is encased in a solid plastic lens, which is much tougher than the glass envelope of a traditional light bulb or tube. The plastic may be colored, but this is only for cosmetic reasons and does not affect the color of the light emitted.

Most typical LED's are designed to operate with no more than 30-60 millewatts of electrical power.  In 2002, 5 watt LED's became available with efficiencies of 18-22 lumens per watt.

SMD (Surface-Mount-Device) LED's have been created that combine RGB LED’s (Red, Green, Blue - which can make White and other colors) in one LED shell.  This allows the display matrix, pitch, to be much closer.  So far even our SMD LED Signs™ do not have the light output for outdoor use.  (See “SMD LED Signs™” above.)  Manufacturers currently brag that they can produce 2-6,000 nits.

Broadway Digital LED Signs™ Solarbrite™ LED’s are 8,000 to 13,000 nits, depending on color.  (The brightness of Solarbrite LED's can be turned down if they are too bright.)

Many companies manufacture LED’s.  There are over 5,000 varied LED’s available, and they vary greatly as to brightness, nits, lux, light-dispersal (viewing) angle, useful lifetime, and lifetime.

Some are very cheap, some are quite expensive.

Broadway Digital LED Signs™ only use Solarbrite™ LED’s that are rated to retain 80% of their brightness for 60,000+ hours.  These are the most expensive, but highest value, conventional LED’s.  Our selection of LED’s is what makes our signs brighter, and last longer.

A Solarbrite™ LED incorporates a new kind of chip, different from all other LED's.  Broadway LED Signs™ is an industry leader in the implementation of new technology in advertising.

Solarbrite™ LED’s utilize military specification coatings on the circuit boards the LED’s are attached to, preventing corrosion and electrical problems.

LED’s are also affected by voltage.  For instance, an LED will also burn nearly 100% brighter if you double the power feeding it.  The LED will last about 1/6 as long, however, making this alternative quite expensive in total cost.

We power our Solarbrite™ LED’s properly.

Size Matters


Notice the size of the LED's in the photograph below.  Sunburst Displays™ Balanced Array™ (the bottom LED board) uses LED's that are 250% larger in area than virtually any LED's used by manufacturers that still manufacture pixel cluster displays.

Our purpose-built LED is oval, focusing most of the light forward, to the sides, and down.  No reason to waste energy shining light on the glare shield above the LED.  These larger oval LED’s result in brighter signs with more “light-fill” in every image.

 

RED LED MESSAGE CENTER, GARLAND, TEXAS Adkins Dentist 2 RED LED MESSAGE CENTER, DALLAS, TEXAS  Adkins Dentist 1

 

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