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Why Pledco is using 1R1G1B instead of 2R1G1B in
its Full Color screens?
1) We used to use 4 LEDs for one pixel 5 years ago. Two red, one green, one blue. But since then, we have been
following the most advanced technology in the LED technology and have been trying to switch to 1R1G1B.
For the past 3 years, we have been using 3 LEDs, one red, one green, and one blue. This is the latest
method used by the other leading companies.
2) The advantages of 3 LEDs include:
a) Less power consumption, 3 LEDs vs 4 LEDs which means less money for running the LED screen in the
actual use;
b) Better reliability: fewer soldering points means less probability of failure;
3) The reason why 3 LEDs can be used is because the brightness of red LEDs has been greatly enhanced. Red
LEDs used to be much dimmer and there were not enough portions of red light in the formula to make white
color. Red LED lamps were only 300~400mcd. At that time, green LEDs were already very bright
(1200mcd~1500mcd). In order to produce white color, we needed 1 portion of blue+ 3 portions of red+ 6
portions of green. We needed two red LED lamps to produce around 800mcd in the formula. Now we
have one red LED lamp which can produce more than 800mcd brightness.
4) With 4 LEDs, people created virtual pixel technology, enhancing the color picture quality when displaying
video files. 4 LEDs matched very well with that technology.
5) Now, however, even with 3 LEDs, we are able to create virtual pixel display effects when displaying video
files. Many of our competitors do not develop their own technology. They are still using their familiar
method of 4 LEDs.
The attached tables illustrate the advancement of red LED technology.
Table I. Comparison of Nichia s old version 2R1G1B formula with its latest 1R1G1B formula.
Comparison of Nichia s Red Color Lamps in Old and New Formula Pixel Compositions
Red Color in Old Formula 2R1G1B
Red Color in New Formula 1R1G1B
Luminous
Model
Color
Rank
Number
NSPR546CS
Red
Luminous
Intensity(mcd)
Model
min
typ
max
R
360
440
510
Q
255
305
360
P
180
220
265
Color
Rank
Number
NSPR546HS-E
Red
Intensity(mcd)
min
typ
max
V
1440
NA
2040
U
1020
NA
1440
T
720
NA
1020
Table II. Cree s New Formula With C5SMF Red Lamps
Cree s Recommended Formula Pixel Compositions
Luminous Intensity(mcd)
Model Number
Color
min
max
C5SMF-RJS
Red
1100
4180
C5SMF-GJS
Green
2130
8200
C5SMF-BJS
Blue
550
2130
Notes: Close bins are delivered so that LEDs of each batch are in narrow luminous intensity range.
www.pledco.com
Table III. Cree s New Formula With C5SME Red Lamps
Cree s Recommended Formula Pixel Compositions
1R1G1B
Luminous Intensity(mcd)
Model Number
Color
min
max
C5SME-RJS
Red
770
2130
C5SME-GJS
Green
2130
8200
C5SME-BJS
Blue
550
2130
Notes: Close bins are delivered so that LEDs of each batch are in narrow luminous intensity range.
Table IV. Everlight s New Formula With 5484BN Series Lamps
Everlight s Recommended Formula Pixel Compositions
1R1G1B
Model Number
Color
5484BN/R7DC-AHJB
Luminous Intensity(mcd)
min
max
Red
1220
2040
5484BN/GADC-AMNA
Green
2880
7970
5484BN/BADC-AGJA
Blue
720
1450
Notes: Close bins are delivered so that LEDs of each batch are in narrow luminous intensity range.
From the above tables, we can see that with the new formula of 1R1G1B, we can now get more brightness
from red color with just one red LED than we could get with two brightest red color LED lamps 5 years ago.
- With the old Nichia formula of 2R1G1B, the brightness of red color ranged from 180mcd~510mcd,
which when multiplied by 2 becomes 360mcd~1020mcd, whereas with the new formula Nichia s
1R1G1B, we can get a brightness of red color ranging from 720mcd~2040mcd with just one red LED
lamps.
- If we are to use Cree LEDs, the brightness of red color from one LED lamp in the 1R1G1B formula is now
ranging from 1100mcd~4180mcd if we use the C5SMF series, or 7700mcd~2130mcd if we use the
C5SME series.
- If we are to use Everlight LEDs, we can get 1220mcd~2040mcd for red color, also much higher than
what we could get 5 years ago which was 360mcd~1020mcd for red color on Nichia s 546 series
models.
Thanks to the advancement of the LED lamp manufacture technology, most of the leading LED screen
manufacturers are now using only ONE red LED lamp instead of TWO LED lamps to form a basic pixel.
www.pledco.com