Is it possible to use it to stop the mirror?

Hello K.S,

NO. The mirror will be constantly refreshing even during a  still image displayed.

The number of times the DMD is mirrors are reset depends on the DLP display sequence that is running and also depends input frame-rate. Since, you are referring to still-image, i am assuming your reference is to Color Images that are shown in static image display mode.

For instance,

In the still image display mode, the DM365 is sending video frames (content is still image) to the DLPC300 at 60Hz, so for colored video, inside the controller DLPC300, all the algorithms are enabled to show video without artifacts (PWM artifacts) as you know since DLP is a PWM device.

Now when this video sequence is running in the device, it is showing 8-bits of Red, 8bit of Green and 7bits of blue (blue color less sensitive human eyes show only 7-bit shown here), and each bit (also called as bit-plane) is refreshed many times (also called as bit-segement), for 60Hz video sequence DMD is refreshed about 77 times. You can roughly calculate 16.66ms/77 = .216ms, so DMD is constantly refreshed at every 0.216ms. You can demystify your self by just putting a photo-detector in-front and observing the light output on the oscilloscope. 

Feel free to revert back if anything not clear.

Regards,

Sanjeev

Hello Sanjeev,
I would like to ask you something about this topic.
First of all, I am dealing with images having 1bpp.
I remember I read somewhere in the forum about the status of the micromirros during the static image display mode, in particular, as you say in the message above, there is a refreshing of the micromirros.

I was wondering, what will happen if I displayed the same image for x times in pattern sequence display mode. Do I still have the refreshing behavior during this sequence or the mirrors will remain in the same position?

Thank you.
Pablo

Hello Pablo,

For, 1bpp images the display sequence is totally different. 

This is what happens -

1. If the incoming data is like real-time via Video interface, each RGB 24bit frame can accommodate a total of 24bit-plane, based on the number of 1bpp patterns you select to be displayed, the DMD reset time can be determined.

For example: Input at 60Hz, so 24bit data input, for 1bpp data it goes through total of 24 times reset (DMD refreshed) once for each bit of 24bit data. there is no way to avoid these 24 resets,

2. If the mode used is pre-loaded pattern mode, then DMD is refreshed just ONCE per pattern period. It is not disturbed in between. For example: 1bit @ 250us exposure has one reset so is for 1bit @ 2.0second also has just one reset.

Let me know if I answered you question.

Regards,

Sanjeev

Hello Sanjeev,

I am using 1bpp images in pattern sequence mode, not in video mode. So, my case is the second you mentioned, and I think I have my answer but just to be sure: If I pre-load in the LCr memory for example 100 black images, with an exposure time of 1 sec, after 100 seconds I should have this "refreshing" (or reset) and then again (200, 300 and so on), but not during the 100 seconds, am I right? 

Thank you.

Pablo.

Hello Pablo,

I think you there is some misunderstanding. 

If there 100 black images with exposure per pattern is set to 1 Second. Then each image is shown for 1.0 second on the DMD with one reset.

So each image gets displayed for every 100 seconds for 1.0 second duration where in which DMD is reset just once in that second.

Regards,

Sanjeev