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mang2004

2012-02-09 07:01

IMAX, Barco，Kodak激光影院技術(shù)進展

原文如下，轉(zhuǎn)自www.insightmedia.info，來不及翻譯，只當學E文。希望對大家尤其是激光顯示界有幫助。
亮點：4K DMD; 600W, 55000流明; 對比度2300:1。
對散斑的報道讓人琢磨不透 --- 個人觀點而已，見仁見智，請大家客觀地分析吧：）

IMAX, Barco and Kodak to Bring Laser Cinema
Last time I did a Display Daily column on laser cinema was back when IMAX announced they had licensed the Kodak laser cinema technology. But, neither IMAX nor Kodak actually builds projectors. Now the other shoe has dropped with announcements by Barco and IMAX that Barco has been chosen to be the exclusive supplier of projectors for IMAX for the next 7 years. According to the announcement, the laser projectors will incorporate technology IMAX has licensed from Kodak.
This 7-year agreement covers both xenon lamp-based projectors and laser projectors. Previously, Christie had supplied the IMAX xenon projectors, so this is a big feather in its cap for Barco. IMAX may not be a huge market itself, but it is certainly a very visible one. The first xenon-based IMAX projectors are expected to be installed by mid-2012. Installation of Barco laser projectors at IMAX venues will begin in 2013.
In January, Barco demonstrated a laser projector with an eye-popping 55,000 lumens. See the February issue of Large Display Report for details on that demonstration. Here are some additional technical details of the demonstration that were not available in time for the February LDR:

600 optical watts of laser power (Total R+G+B)
Laser light is coupled to the existing integration rod in a conventional DP 4K-32B optical core.
1.38-inch DLP 4K DMD with an illuminated area is 4096 X 2160 pixels was used.
Contrast of 2,300:1
The wide color gamut of the laser was mapped to a standard digital cinema P3 color gamut for the demo.
Everything was self-contained in one projector cabinet 30" wide X 36" high X 60" long (76 x 91 x 152 cm). This includes the lasers and the laser drivers.
A standard projection lens was used, with no optical modifications done on the output side of the DLP optical core.
The demo was shown on a 70 foot (21.3M) wide Harkness matte screen (1.0 gain) at a light level of 22fL. 22 fL on a gain 1.0 screen area of 2,560 sq. ft. (238M2), corresponds to 56,980 Lumens.
Pictures were excellent, with especially good uniformity and resolution across the full screen.
There was no observed chromatic aberration in the image.
By all reports, speckle was not an issue. Even experienced observers could not see speckle in color bars showing the P3 color gamut. When color bars showing the full laser gamut were shown, the speckle in the green bar was visible although still not objectionable. Barco acknowledges speckle is objectionable on a silver screen for 3D, however.
A retrofit program for existing digital cinema projectors is thought to be necessary by Barco, and product development is including that option.
The demonstration was not a product yet.
Barco listed the challenges as: