RGB Triple Laser RGB triple-laser (RGB pure laser) projector light source

What an RGB triple laser is

Most laser projectors are not RGB lasers. They use a blue laser diode to excite a spinning phosphor wheel, and the phosphor converts part of the blue light to yellow, which filters then split into red and green; the rest of the blue passes through. Celluloid Junkie calls this laser-assisted light, because only one color is generated by the laser itself and the others are made chemically. An RGB laser projector instead uses three separate sources, one red, one green and one blue, each at its own wavelength, combined optically on the imaging chip. Christie says its RGB pure laser projectors use individual red, green and blue laser diodes set at specific wavelengths, and ViewSonic notes the type is also called direct laser or pure laser. Digital Projection makes the optical point: laser phosphor has wide red and green wavelengths with only the blue direct, while the narrow bandwidth of RGB lasers gives sharper-looking color.

Color gamut: what is measured and what is claimed

The gamut advantage is the headline. Christie's comparison table lists Rec. 709 for its 1DLP and 3DLP laser phosphor lines and Rec. 709, DCI-P3 and Rec. 2020 for RGB pure laser, and states that RGB pure laser reproduces approximately 98% of the Rec. 2020 gamut. Digital Projection says its 3-chip RGB pure laser projectors reach over 98% of Rec. 2020, which it describes as more than twice the color of Rec. 709 projectors and 41% more than DCI-P3. ViewSonic says 100% of Rec. 2020. Treat 98% to 100% as the cinema-grade range, and read it as a ceiling that depends on the specific engine.

Home projector claims run higher and are less clear. Samsung says the Premiere LSP9T delivers a color gamut of up to 147% of DCI-P3, which it states as 106% of BT.2020, on a 130-inch screen. Hisense claims its PX3-Pro reproduces up to 110% of BT.2020, a figure ProjectorReviews calls reported. A coverage number cannot exceed 100%, so these are probably area ratios and not coverage. Samsung's own two figures support that reading: 147 divided by 106 is 1.39, close to Digital Projection's statement that Rec. 2020 holds 41% more than DCI-P3, which is the relationship between the two areas. The pages I loaded do not say how either maker measured, and I did not find an independent measurement of either. Compare them only against each other and only as manufacturer claims.

Rainbow effect and the one-chip catch

RGB lasers do not automatically remove rainbow artifacts. The rainbow effect comes from showing red, green and blue in sequence on one chip, and the fix is architectural. Wikipedia's DLP article says three-chip DLP projectors work without color wheels and so show no rainbow artifact, and that multi-color LED-based and laser-based single-chip projectors eliminate the spinning wheel and minimize the effect because laser pulse rates are not limited by physical motion. That is minimize, not eliminate. The Hisense PX3-Pro, for example, is a single-chip DLP design with a 0.47-inch DMD and 4-way XPR pixel shifting per ProjectorReviews, so it still builds color sequentially, only much faster than a wheel. Three-chip cinema engines such as Digital Projection's and Christie's have no sequential color at all.

Brightness, lifetime and cooling

Christie lists RGB pure laser at 15,750 to 50,000 lumens, against 5,000 to 23,650 lumens for 1DLP laser phosphor and 31,500 for 3DLP laser phosphor. Its illumination rating is 25,000 hours to 50% brightness at 100% power and 50,000 hours at 60% power, compared with 20,000 hours for the phosphor lines. Celluloid Junkie reports phosphor systems topping out around 30,000 to 35,000 lumens, RGB systems reaching 60,000 lumens and higher, and typical lifetimes of 20,000 to 30,000 hours for phosphor and 30,000 to 50,000-plus hours for RGB. The trade is complexity: the same article says RGB cooling is more complicated, often multi-loop liquid cooling, and the upfront cost can be more than double a phosphor equivalent. It places phosphor in screens up to 12 to 14 meters wide and RGB in premium large format auditoriums, which connects to premium large format and the light budgets in foot-lambert.

Where it lives in the home

The Samsung Premiere LSP9T (2021) is an ultra-short-throw triple-laser model with a throw ratio of 0.189, a 100-inch image from 4.4 inches off the wall, a rated light source life above 20,000 hours and HDR10+. The Hisense PX3-Pro lists 3,000 ANSI lumens as a manufacturer claim (ProjectorReviews notes 2,600 peak lumens, 13% lower), 3,000:1 native contrast, a 0.22 throw ratio for 80- to 150-inch images and 25,000-plus hours of source life at $3,499. ViewSonic also sells an RGB laser home model, the LX700-4K. See ultra-short-throw projector, throw ratio and laser phosphor for the alternatives.

Common confusions

Triple laser is not the same as three-chip, and it does not guarantee better contrast: the PX3-Pro's 3,000:1 is a long way below the 80,000:1 native figure JVC lists for its LCoS DLA-NZ8. RGB light can look brighter than its lumens figure because saturated color triggers the Helmholtz-Kohlrausch effect, which ViewSonic cites as a reason for the perceived-brightness edge, but that is perception, not extra ANSI lumens. And a wide gamut only helps with wide-gamut content. See BT.2020, DCI-P3 and color gamut coverage for how those numbers are defined.