Anybody have devices using RGB LEDs?

Doug Salot doug at
Thu Feb 9 17:10:28 CST 2006

On Thu, 9 Feb 2006, Barry Watzman wrote:

> Wrong.  Blue (and White) LEDs are a relatively recent invention.  I'm not
> sure when they first came into existence, but it was WAY after 1991; it was
> closer to or even after 2000, although it might have been in the very late
> 1990's.  White LEDs were even later.  There were 3 color LEDs in 1991, but
> not RGB.

9005 Pacific Coast Highway 
Torrance, CA 90505 
(213) 549-9995 
fax (213)549-4820 

MARCH 8, 1991 

TORRANCE, CALIFORNIA -- Today, the industry's first integrated red, 
green, blue (RGB) LED is available for the wide range of 
applications anticipated since last years introduction of the blueLED. 
Designated the L300RGB series, this discrete is packaged in a clear 
or diffused 0.300" ( 8mm ) case. Incorporating state of the art chip 
mounting technology that dissipates heat in closely spaced chip 
arrays, this discrete utilizes high efficiency red chips ( 635nm), 
high efficiency green chips ( 565nm), and 470nm blue chips. Direct 
access to the RGB chips and a common cathode provide a virtual 
cornucopia of color to the applications engineer. 

Within the next six (6) months, this RGB discrete will be available 
in a T1-3/4 (3mm) package. Design analyses for the T1 (3mm) package 
are progressing. Additionally, total flexibility in chip selection 
has been retained. Thus, this device can be manufactured with deep 
red (660nm), pure green (555nm), and 470nm blue chips. 

The potential applications for this discrete are as varied as the 
colors available from it. First, of course, is a the [sic] best 
rendition of a white color available in the LED market. The L300RGB 
also serves as the fundamental multicolored pixel for large area 
full color screens/monitors/displays. Additionally, the L300RGB 
can be used in full color moving signs/displays, as a light source 
for a variety of scanners such as used in color copiers and equipment 
which senses a paper's color differences to detect counterfeit 
currency, as a spectral analysis reference or source in color 
scanning and high speed document reading, and color synthesis for 
photic stimulation/simulation. 

Data sheets for the L300RGB are available describing the brightness 
of each chip and related electro-optical characteristics. 
Necessary bias requirement to operate the L300RGB as a 5 VDC 
discrete to obtain a white color are also provided. Application 
notes regarding other colors/characteristics are currently 
in preperation. Gather up the power supply and decade resistance box -- 
develop your rainbow of color. Prototype quantities are 
immediately available. Costs for OEM quantities are expected to 
be in the $5-$7 range. 

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