Previously when testing my connection, I had an external power supply providing +4v and +3v, as per the schematic on the wiki. I used an external supply while waiting for regulators to arrive, and in that testing there was video bleed, as seen in the images I put online.

 

Now, I’ve got regulators supplying 3.8v and 3v (voltages as per the display specs) and the bleed has completely disappeared. I don’t know if the external supply (a decent bench supply) happened to be noisy, or the subtle voltage difference on Vcc1, or something else was at fault, but this is definite progress.

 

 


From: gumstix-users-bounces@lists.sourceforge.net [mailto:gumstix-users-bounces@lists.sourceforge.net] On Behalf Of Fabio Miguez
Sent: Tuesday, June 05, 2007 7:21 AM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] ACX705AKM display connection

 

Hey Mark,

I am surprised no one replied to this message yet.  I guess not many people in this list are interested in screens as much as I am! :)

Thanks for the pictures!

Is that connector, at the end of the screen ribbon cable, just resting on top of your gumstix?  It almost looks like that connector is part of the gumstix itself.

Since I have little knowledge of gumstix, here are some elementary questions.  What board is the one shown on the picture?  What are the connections at the bottom of the board, are those GPIOs?  What do you use those for in your case?

Have you been able to solve the bleed problem on the screen?  And how hard was it to get Qtopia on a gumstix?  Finally, how does the VNC app work, it actually allows you to see X running on the verdex just like it was a screen attached to it?

Sorry for so many questions, but you got me all excited about this screen!!!

On 5/31/07, Heilpern, Mark < mark.heilpern@authentec.com> wrote:

I've got some pictures online…

 

http://www.heilpern.com/gumstix/image1.jpg

http://www.heilpern.com/gumstix/image2.jpg

http://www.heilpern.com/gumstix/image3.jpg

 

These are 3002x2000 images, around 3MB each. Probably only the first and third images are interesting. The first shows the full setup, where the second is zoomed in on the screen. The second came out darker though, and the screen content is more clear in the first image. The third image is the same Qtopia application (gradients) running on the Gumstix but displaying to a VNC server, as viewed on a Windows machine.

 

Since the application is designed for a much larger screen area, I don't expect it to look great on the 240x160 display, but I don't think that's the cause of the bleed that's visible in these images. Probably a frequency configuration issue?

 


From: gumstix-users-bounces@lists.sourceforge.net [mailto:gumstix-users-bounces@lists.sourceforge.net] On Behalf Of Heilpern, Mark
Sent: Wednesday, May 30, 2007 12:53 PM


To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] ACX705AKM display connection

 

I snapped one prior to my last email, but the picture came out terribly (on a mobile phone camera, under poor lighting). If I can get a shot that shows things better I'll post a link.

 


From: gumstix-users-bounces@lists.sourceforge.net [mailto: gumstix-users-bounces@lists.sourceforge.net] On Behalf Of Fabio Miguez
Sent: Wednesday, May 30, 2007 8:49 AM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] ACX705AKM display connection

 

Hi Mark,

 

Any chance you could get a couple of pictures of the screen at work?

 

Thanks,

 

On 5/29/07, Heilpern, Mark <mark.heilpern@authentec.com> wrote:

I got the display to light up with recognizable data… it's far from good looking (or even usable), but it's recognizable.

 

The test program is a Qtopia demo application, "gradients". I've run this program against a VNC buffer to make sure it runs and it looks perfect in VNC – except the application is much larger than 240x160, so it might not be a good test case. The physical display shows the upper left of what I expect to see, and the colors are more or less what I expect… the problem is the screen has a large amount of horizontal jump, like a clock isn't at the right frequency… this leads to a fair amount of pixel bleed towards the right.

 

I set the registers according to the script at http://docwiki.gumstix.org/Display#Setting_up_the_Sony_ACX705AKM_on_gumstix.

 


From: gumstix-users-bounces@lists.sourceforge.net [mailto:gumstix-users-bounces@lists.sourceforge.net ] On Behalf Of Jozsef Lenart
Sent: Saturday, May 26, 2007 4:13 AM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] ACX705AKM display connection

 

 

2007/5/26, Fabio Miguez <fabiomiguez@gmail.com >:

Hi Mark,

How's this going?


I'm doing the same work with the same components too. Yesterday night i've wired the frontlight and it works (from 6V, 15mA). Hopefully today i'll do the rest and show some pictures on it.
Good luck!


NOTE: The information in this message is intended for the personal and confidential use of the designated recipient(s) named above. To the extent the recipient(s) is/are bound by a non-disclosure agreement, or other agreement that contains an obligation of confidentiality, with AuthenTec, then this message and/or any attachments shall be considered confidential information and subject to the confidentiality terms of that agreement.   If the reader of this message is not the intended recipient named above, you are notified that you have received this document in error, and any review, dissemination, distribution or copying of this message is strictly prohibited. If you have received this document in error, please delete the original message and notify the sender immediately.

Thank you.

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Thank you.

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NOTE: The information in this message is intended for the personal and confidential use of the designated recipient(s) named above. To the extent the recipient(s) is/are bound by a non-disclosure agreement, or other agreement that contains an obligation of confidentiality, with AuthenTec, then this message and/or any attachments shall be considered confidential information and subject to the confidentiality terms of that agreement.  If the reader of this message is not the intended recipient named above, you are notified that you have received this document in error, and any review, dissemination, distribution or copying of this message is strictly prohibited. If you have received this document in error, please delete the original message and notify the sender immediately.

Thank you.

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