In order for three dimensional images to be
perceived, the controller projects differing left and right frames sequentially. A complete
3D frame will have a left and a right subframe which will be shown or blocked via 3D
glasses. As a result the controller will be transmitting frames as 120Hz for a 60Hz frame to
be perceived. For proper use, an external trigger signal must drive into the GPIO that acts
as the left/right frame sync trigger, known as the 3DLR trigger. In the case of the
DLPC8445, this input is GPIO_21.
A proper setup for 3D video transmission
would be the following:
- Connect oscillating signal into the
controller left/right frame sync trigger GPIO.
- Boot DLP® circuitry.
- Set up source and configure V-by-One.
- For 3D, acceptable sources would be
1080p 100Hz or 120Hz frame sequential alternating streams. The sequential alternating
stream must be configured by the video front end.
- See Section 10.2 for information on V-by-One
source setup.
- Send Enable Three D command (Section 9.4.3) according to the front
end and sync signal.
Note: When running a 3DLR trigger, 1
milli-second minimum seperation is needed between the trigger pulse and VSYNC for stable
locking.
Note: Tests have shown that 3D is non-functional when blankings equal or exceed 144.