Podcast 57: Bob Williams

Runco's Chief Product Architect Bob Williams talks about the company's new D-73d dual-engine 3D projector, the three main types of stereoscopic imaging, the difference between linear and circular polarization, LEDs versus lamps as illumination sources, screen issues for 3D projection, the challenges of dual-projector 3D, commercial-cinema 3D, plasma and LCD flat-panel 3D, and answers to chat-room questions.

Run Time: 59:36

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Jarod's picture

Such an interesting podcast! It was the geekiest ever and I loved it! I learned very much. I was surprised to find out that a curved silver screen can eliminate hot-spotting with 2D material. Im really looking forward to your take on the D-73d. I bet it will be incredible.

WazNeeni's picture

About the part where you guys were talking about the % of light lost at the polarizer, then at the glasses.

You lose 20% at the polarizer, then another 20% at the glasses. However, the 2nd 20% is only 20% of the 80% coming thru the polarizer.

100 x .80 = 80 --> 80 x .80 = 64

So, not 70%, like Bob was saying, but not 60% either.

Bob Williams's picture

Jim, the Dolby system indeed triple flashes each frame when in 3D mode for a combine 144Hz display. However, when the projector is switched to 2D it will refresh at 24Hz. 144Hz is needed to prevent flicker since each eye view is seen only 50% of the time. In 2D, both eyes see a continuous view, and the projector can match the content's original frame rate. At 24Hz the brightness is higher and the bit depth available to the DLP system is higher.

Bob Williams's picture

Your math is correct. I did the calculation quickly in my head and came up with 67% (70% when you round it), but you are right.

Jim Hofmann's picture

Listened to an excellent podcast with Scott Wilkinson and you talking about your latest projection project. Your discussion was fill with interesting and valuable information.

There was a section of you saying digital projection, 3D, is shot to the screen in 24 frames per second. I wonder about that. I am a projectionist who had a great hand in installing a Dolby DLP projector and we were/are under impression that, yes, 24 fps but the

HDTV1080P's picture

The problem with old film projectors was that they only could show you an image half of the time, and the other half of the time you would be shown black.


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