Similar to the 8-bit external pattern
mode, the maximum supported 24-bit input frame for 1-bit external pattern mode is
104.2 Hz. In 1-bit pattern mode each of the 24-bit inputs are treated as separate
binary patterns resulting in a maximum of 24 patterns. The maximum pattern rate for
each 1-bit pattern is 2500 Hz.
The DLPC3478 controller firmware
allows for the following user programmability:
- Exposure time: Time during which a pattern is displayed.
- Dark time: Time during which no pattern is displayed and the
illumination in off.
- Number of 1-bit patterns within a frame - up to maximum of
24.
- Illuminator: Illuminator that is on for each 1-bit pattern.
User defined illuminator is auto selected for all the patterns within a frame.
User cannot select different illuminator for different 1-bit patterns within a
frame.
- TRIG_OUT_1 and TRIG_OUT_2 signal configuration and delay.
Figure 7-11 shows a configuration with 24 × 1-bit patterns.
- 24 × 1-bit patterns are displayed within each input VSYNC
frame period.
- tDarkPre, tExposure and
tDarkPost are the same for each pattern within a frame
period.
- The sum of dark time and exposure time (tDarkPre
+ tExposure + tDarkPost) for all the 1-bit patterns
must be equal to or less than the full frame period. If the sum is less than
the full frame period, additional dark time will be appended to the end of
the last pattern.
- The Blue LED is configured to be ON for each pattern.
- TRIG_OUT_1 (Frame Trigger) is configured active high
polarity and will have a minimum pulse width of 20 microseconds. TRIG_OUT_1
delay (tD1) is configured with respect to input
VSYNC.
- TRIG_OUT_2 (Pattern Trigger) is configured active high
polarity and stays active during the pattern exposure. TRIG_OUT_2 delay
(tD2) is configured with reference to the start of the
pattern and is set once per pattern within a frame.