Page 94 of 174 FirstFirst ... 4484858687888990919293949596979899100101102103104144 ... LastLast
Results 931 to 940 of 1738
Like Tree13Likes

Thread: "Transflective" LCD panel with res touch+controler for $101+$36 S+H

  1. #931
    Variable Bitrate
    Join Date
    Mar 2004
    Posts
    286
    Is there any way to control the backlight other than the up/down type buttons? I'd like to have an autodimming function and don't mind making my own circuit, but it'd be nice if there were pins that would correspond to something like "apply 3.3v to pin 2 and get 50% brightness" rather than going through a menu.

  2. #932
    Maximum Bitrate
    Join Date
    May 2011
    Posts
    483
    Quote Originally Posted by dyne View Post
    Is there any way to control the backlight other than the up/down type buttons? I'd like to have an autodimming function and don't mind making my own circuit, but it'd be nice if there were pins that would correspond to something like "apply 3.3v to pin 2 and get 50% brightness" rather than going through a menu.
    emm. I don`t think we can do this now. will check with the tech anyway

  3. #933
    Newbie theBlueLight's Avatar
    Join Date
    Aug 2008
    Location
    Melbourne, Australia
    Posts
    43
    Quote Originally Posted by dyne View Post
    Is there any way to control the backlight other than the up/down type buttons? I'd like to have an autodimming function and don't mind making my own circuit, but it'd be nice if there were pins that would correspond to something like "apply 3.3v to pin 2 and get 50% brightness" rather than going through a menu.
    I did actually ask this question a page or so ago. Now that I actually have the PCB in front of me I think it is possible. I already had two of the older style VGA only control boards, which I don't think you can change the brightness on, so I purchased two of the newer ones along with my third panel. Now I have them this is what I have found:

    The connector CN13 that has not been added to the board (right next to one of the screen connectors CN18) has an ADJ pin, pin 3 I think. If you follow this track it looks like it connects to a surface mount capacitor and resistor, this resistor then feeds pin 7 of U11. The light in my study is pretty bad, but I think U11 has S142 written on it, which could very well be a PWM controller for LEDs the datasheet of which is this I believe. And sure enough, pin 7 is the brightness control. The datasheet has some pretty good instructions on how this brightness pin works, sounds like it can accept a filtered PWM signal or you can feed it with an analog voltage. I suspect that the resistor / capacitor network that the ADJ pin on CN13 connects to is some kind of filter, so maybe if you jam a PWM signal on that ADJ pin that will do the trick, but you would need to figure out what frequency it would cope with I guess.

    This was all at a quick glance, I could be quite wrong. I'll need to actually put some time into it to verify, which I'm not going to do now as I am ill, by brain hurts and I'm hungry.

    Spaghetti calls....

  4. #934
    Constant Bitrate
    Join Date
    Dec 2006
    Location
    India
    Posts
    213
    Excellent find theBlueLight!

    S142 is indeed the order code for MIC2297-42YML PWM LED Driver and it can take an analog voltage as well as a PWM control. The control formulas are already there in the datasheet you've linked to. Thanks!

  5. #935
    Maximum Bitrate
    Join Date
    May 2011
    Posts
    483
    Quote Originally Posted by theBlueLight View Post
    I did actually ask this question a page or so ago. Now that I actually have the PCB in front of me I think it is possible. I already had two of the older style VGA only control boards, which I don't think you can change the brightness on, so I purchased two of the newer ones along with my third panel. Now I have them this is what I have found:

    The connector CN13 that has not been added to the board (right next to one of the screen connectors CN18) has an ADJ pin, pin 3 I think. If you follow this track it looks like it connects to a surface mount capacitor and resistor, this resistor then feeds pin 7 of U11. The light in my study is pretty bad, but I think U11 has S142 written on it, which could very well be a PWM controller for LEDs the datasheet of which is this I believe. And sure enough, pin 7 is the brightness control. The datasheet has some pretty good instructions on how this brightness pin works, sounds like it can accept a filtered PWM signal or you can feed it with an analog voltage. I suspect that the resistor / capacitor network that the ADJ pin on CN13 connects to is some kind of filter, so maybe if you jam a PWM signal on that ADJ pin that will do the trick, but you would need to figure out what frequency it would cope with I guess.

    This was all at a quick glance, I could be quite wrong. I'll need to actually put some time into it to verify, which I'm not going to do now as I am ill, by brain hurts and I'm hungry.

    Spaghetti calls....
    Thanks for sharing

  6. #936
    Maximum Bitrate
    Join Date
    May 2011
    Posts
    483
    We need opinion. Is a Capacitive Touch worth extra $60? We are plan to update the touch to Capacitive but the cost looks a little high. It use the new USB touch controller with only one chip

  7. #937
    Variable Bitrate
    Join Date
    Jan 2012
    Posts
    305
    Quote Originally Posted by 8838.com View Post
    We need opinion. Is a Capacitive Touch worth extra $60? We are plan to update the touch to Capacitive but the cost looks a little high. It use the new USB touch controller with only one chip

    Only 60 more! That's cheap if you ask me. Right now we have to spend something like 100 more to add capacitive.

  8. #938
    Constant Bitrate
    Join Date
    Dec 2006
    Location
    India
    Posts
    213
    Quote Originally Posted by 8838.com View Post
    We need opinion. Is a Capacitive Touch worth extra $60? We are plan to update the touch to Capacitive but the cost looks a little high. It use the new USB touch controller with only one chip
    Capacitive Touch is totally worth it and $60 is not a high price to pay for the benefits.
    Currently I'm using 3M Capacitive touch screen and its very difficult to think going back to resistive touch screens.

    When can you start offering the Capacitive Touch option?
    Last edited by DigitalVampire; 03-01-2012 at 10:42 PM.

  9. #939
    Maximum Bitrate
    Join Date
    May 2011
    Posts
    483
    We need to place the order at least 1000pcs at a time. That is why we need everybody`s opinion, to see if it worth to do it

    If we can get more positive responses. We will place the order soon and should be able to sell in a month or so, depends on how fast the manufacture fulfill the order.

  10. #940

Similar Threads

  1. FS: 10.2" LCD Touch kit w/transflective enhancement
    By Motorcity in forum Classified Archive
    Replies: 15
    Last Post: 03-14-2007, 02:20 PM
  2. Replacement 4:3 8" Touch Panel For "Super"
    By gsd_racing in forum Input Devices
    Replies: 4
    Last Post: 01-25-2006, 05:28 PM
  3. Replies: 146
    Last Post: 08-19-2004, 03:39 AM
  4. Replies: 2
    Last Post: 12-11-2003, 10:36 PM
  5. Can I use an 8" touch panel with a 6" lcd?
    By Odie in forum LCD/Display
    Replies: 6
    Last Post: 10-29-2002, 11:28 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •