Similar to the 8-bit external pattern
mode, the maximum supported input frame for 1-bit external pattern mode is 60 Hz. In
1-bit pattern mode each of the 24-bit inputs are treated as a separate binary
patterns resulting in a maximum of 24 patterns. The maximum pattern rate for each
1-bit pattern is 1440 Hz.
The DLPC3479 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 the three 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.
- 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.