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6.9 What timings are supported by Internal pattern
streaming mode?
For the desired exposure time, first find the correct sequence number in the table
below according to the range of exposure times. Then use the following two formulas
to calculate the minimum pre-exposure dark time and post-exposure dark time.
T
= t
min pre-exposure dark time
T
= t
min post-exposure dark time
For example, if the required exposure time is 300us, then
T
= 170us * (300us / 200us) = 255us
min pre-exposure dark time
T
= 30us * (300us / 200us) = 45us
min post-exposure dark time
Note: The numbers in the table may differ by 1, and there may be differences
between I2C commands and using the GUI directly.
6.10 Do these minimum darkfield times have to be
calculated?
No, customers do not need to calculate these minimum darkfield times
themselves. Enter the desired exposure time in the GUI software and click "Program
pattern data", the controller will return the minimum "pre-exposure dark time" and
"post-exposure dark time". This function is done with the help of I2C commands,
which is 0x9D in DLPC347x controllers.
sequence min pre-exposure dark time
sequence min post-exposure dark time
* (T
/ T
desired exposure
sequence exposure minimum
* (T
/ T
desired exposure
sequence exposure minimum
56
)
)
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