Originally Posted by walt73
Originally Posted by taz291819
Why would the BD player have to do the triple-flash? Couldn't the display do it, hence saving bandwidth? Put the display in "3D mode", and it knows to triple-flash the incoming signal. Like today's 120Hz displays, they don't actually accept a 120Hz signal, it's a 24p signal, and the display does x5 multiple (or 2:3 *2).
A few lines from the bottom of the inset quote it specifically says:
"The triple flash rate is a property of the projector, and is the flash rate employed with all add-on technologies for presenting 3-D images in the theatre."
It doesn't come from the BD player, or the hard drive in the commercial theatre.
Originally Posted by Lee Stewart
144 Hz is the refresh rate of 3D Digital Cinema but it won't be used for consumer FPD displays IMO. Too specialized.
It won't be useful for anything but 3D and most of the time, the display will be used for 2D viewing. So it has to be 120, 240 etc.
60hz hold time is 16.67ms
120hz hold time is 16.67/2 = 8.335ms
240hz hold time is 16.67/4 = 4.1675ms
480hz hold time is 16.67/8 = 2.08375ms
960hz hold time is 16.67/16 = 1.041875ms
a.) 48 frames and 10:10 pulldown = 480 frames = 480Hz monitor refresh rate
b.) 96 frames and 10:10 pulldown = 960 frames = 960Hz monitor refresh rate
"3D system of time-sequential system requires for fast response
of LC because the frame frequency is twice as high as that of 2D
system. For example, the frame rate is 120Hz so the period of
one frame is only 8.33ms. The response time of LC should be
much shorter than 8.33ms. The slower response of LC shall
cause the 3D crosstalk and the loss of luminance."
"The OCB mode is well-known for its fast response. We have
newly developed LC material to improve the response time of
OCB (Fig.3), τr+τd=3ms. The rise time from all gray level to
black is very fast, < 0.26ms (Fig.4). This means display image
can be resetted immediately and it make no influence to next
image. In this case very small 3D crosstalk is achieved. The fast
decay time from black to any gray level means high luminance of
3D display because of the high effective aperture in time range of
LC response. We can get high luminance 3D display using
In case of other LC mode, large 3D-crosstalk will appear
because the response time to the black is not so fast. Also, the
brightness is very low because the time to the white is not fast.
The demand for 3D active shutter glasses is the same as that for
the LCD panel, that is, fast response of LC. The slow LC response
shall cause the 3D-crosstalk and shortage of luminance. So we
also applied OCB to active-shutter glasses."http://www42.tok2.com/home/ksatsch/p...aySystems).pdf
DLP technology can project 3-D images with a single projector by presenting the stereoscopic left/right image pairs sequentially.
This means that a left image is presented, and then a right image is presented, and never will both a left and a right image appear on the screen at the same time.
However, presenting left/right images to the audience at a 48 fps rate is less than ideal as the sequential nature of the images are perceivable and distracting.
To overcome this, sequential projection requires that the stereoscopic pair of images are "flashed" on screen.
This involves, within the time frame of 1/24th of second, the repetition of a left/right sequence three times before presenting the next left/right sequence.
This process is called "triple flash."
With triple flash, the rate in which images are presented to the audience is a speedy 3 x 48 fps, or 144 fps.
The triple flash rate is a property of the projector, and is the flash rate employed with all add-on technologies for presenting 3-D images in the theatre.http://mkpe.com/publications/d-cinem...ice_in_3-D.php
How to calculate HDMI Bandwidth
HSYNC: 1920+280 (horizontal blanking pixel No.)
VSYNC: 1200+50 (vertical blanking line No.)
total pixel per frame = 2200x1250 = 2.75 Mpx/frame
Bit rate = 2.75 Mpx/frame x 24 (= 3x8) bit/px x 60 frame/s = 3.96 Gbit/s
TMDS: 8 bit -> 10 bit
TMDS bit rate = 3.96 Gbit/s x 10/8 = 4.95 Gbit/s
HDMI Maximum TMDS bandwidth (Gbit/s) 10.2
3D Over HDMI
The 1.4 version of the specification will define common 3D formats and resolutions for HDMI-enabled devices. The specification will standardize the input/output portion of the home 3D system and will specify up to dual-stream 1080p resolution.
Maximum refresh rate of hdmi 1.4 = 340Hz
For NTSC the monitor must have pulldown for cable tv as well as 3D Blu Ray.
And since 3D Blu Ray works with 3:3 Pulldown for a sum of 144Hz in the theaters,
the pulldown must be adjusted so the cable tv also has no judder.
Meaning the pulldown on 3D Blu Ray's 48 fps must be 10:10 for the ntsc region: 480Hz lcd monitor refresh rate.
You would divide that refresh rate by two when you deliver the picture to the shutter glasses.
So the effective refresh rate for 10:10 pulldown as shown above is 240Hz each eye when using shutter glasses.
240Hz has a hold time of 4.1675ms, and section C shows that is about right so the effect of "crosstalk" is minimized.
When you factor is the Blu Ray outputting 96fps to the monitor then you would need to make the pulldown different s there is no judder in the 3D Blu Ray movie or the cable tv.
But then the hdmi must have a TMDS allowing 4.95 Gbit/s X 4.
So making the shutter glasses compliant isn't nessessary for 48p video since the hdmi cable doesn't support 4.95 Gbit/s X 4 TMDS nessessary for 48p Blu Ray 3D source video.