18.104.22.168.2 1-Bit Monochrome Patterns
Similar to the 8-bit external pattern mode, the maximum supported 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 a 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 19 shows a configuration with 24 × 1-bit patterns.
Figure 19. 24 × 1-bit (Blue) Pattern Configurations
24 × 1-bit patterns are displayed within each input VSYNC frame period.
tDarkPre, tExposure and tDarkPostare 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.