A synthesis of red, green, and blue light-emitting diodes for increasing the brightness of projectors

Figures & data

Figure 1. Brightness and efficiency characteristics of LED.

Figure 2. Non-color overlapping and overlapping sequence of LEDs.

Figure 3. Color overlapping of LED sequence.

Figure 4. Examples of color overlapping of LEDs.

Figure 5. Brightness increase ratio vs. overlap ratio.

Figure 6. Color gamut of the overlapping method with Rec. 709.

Figure 7. Input current of LEDs.

Table 1. Non-overlapping driving and overlapping driving modes.

	Non-overlapping method (R, G, B)	Overlapping method (R, G, B, Y, C)
Y, C color duty ratio [%]	–	38.9%
R, G, B LED driving ratio [%] PWM method	31-52-18 [100%, non-overlapping]	51.4-66.2-21.3 [138.9%, overlapping]
LED forward current	13.5 A	10 A
Total power consumption	Current: 5.03 A [rms]	Current: 5.06 A [rms]
	Power: 97.6 W	Power: 98.1 W
White point (x, y coordinates)	x: 0.294	x: 0.287
	y: 0.292	y: 0.286
White brightness (in ANSI lumens)	180 lm	243 lm