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Turning off LCD

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Turning off LCD
« on: 02 / April / 2010, 14:54:33 »
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Greetings CHDK forum,

I'm in need of some help.  I put CHDK on my SD780 in an attempt to find a way to turn off the LCD or turn off the LCD backlight during video recording.  This function is available without CHDK on the standard firmware for still shots.  Clicking the Disp button achieves this functionality for stills.  But it doesn't work for video recording, so I installed CHDK in hopes of adding this functionality to my camera.  CHDK is up and running now on my camera without any problems.  But I can't figure out how to execute the function of turning off the LCD or turning off the LCD backlight during video recording.

Please advise me on how to perform this function.  Is a script required to be added?  If so, would someone be so kind as to write me a script and tell me how to use it?  I don't know if that's a tall order. 



Many Thanks,


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Offline an0n

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Re: Turning off LCD
« Reply #1 on: 03 / April / 2010, 00:47:39 »

Hi Camineet,

You might get some clues from these: Time-lapse tutorial (for when using time-lapse script), and Turn off LCD during video on G9.

You can also use an approx 1/8" round piece plastic (or blank av plug) in the av connector to turn display off), this will help  for
stealth mode  ;) but won't save much battery.

You could also try this, (copied from that post), Write: 

set_backlight(0)
exit_alt


to a plain text document and save it to your /CHDK/SCRIPTS folder on the SD card as "LCD Off.bas" , and load as per the
directions in the user manual (P36), Start the recording, and then press ALT and then shutter to run the script.
It might not be the most elegant way, but it may help. (try at your risk, - has worked on my A720).

A720IS.

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Offline fudgey

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Re: Turning off LCD
« Reply #2 on: 08 / April / 2010, 13:32:45 »
What an0n said and one more tiny detail: the reason you can't turn off the LCD during video record the same way you can in still photo mode is that it's physically impossible.

In the 'display off' mode, the sensor, aperture (if exists), focus and who knows what else is shut down to their lowt power states and only revived when you touch the shutter. All of those (especially the sensor) are of course required in order to shoot video. Most of the power savings of the 'display off' mode come from those things, not the LCD or its backlight.

You can shut down the backlight from script as pointed out by an0n, or enable a video output buffer + disable LCD and backlight by inserting something in the video jack.

Re: Turning off LCD
« Reply #3 on: 20 / April / 2010, 04:43:01 »
I have just now had time to briefly revisit this matter.  Your responses are very helpful and appreciated.   I look forward to attempting these solutions sometime in the near future.

I'll be back to pester you for more details and assistance as needed.


Many Thanks,


Re: Turning off LCD
« Reply #4 on: 07 / May / 2010, 03:15:34 »
I've finally had a chance to sit down and try your script.  I figured it would begin simply enough and then turn into an afternoon of work.

Fortunately, I got the script working in about two minutes, and will be happily using it for my stealth missions as soon as one presents itself. 

Thanks a lot for your help with this matter.




Re: Turning off LCD
« Reply #5 on: 19 / August / 2010, 01:39:42 »
I really don't know much on how to write script on LCD. Base on your description, I think that the problem of your LCD is in the script. Try to find someone who is best in writing such script for you LCD.
« Last Edit: 27 / August / 2010, 01:43:42 by candyjob34 »

 

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