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Thread: 3.5" LCD touchscreens: Now Available for $10 each.

  1. #1

    Default 3.5" LCD touchscreens: Now Available for $10 each.

    My supplier for the 4.3" "used" touchscreens has about 1000 new 3.5" units that were never used...

    Could be a nice chance to save them from the landfill...

    Took a quick look at the datasheet and they appear very similar to the 4.3" units, but have an additional SPI interface. Not to happy about needing extra pins, but perhaps this interface allows additional functionality...


    Update: Now for sale! $10 each (+$5 shipping within USA)

    Email ray@rayslogic.com with your order...

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    Post Edited (Rayman) : 1/22/2010 12:32:04 AM GMT
    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

  2. #2

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    If you have money, buy everything, because if not sold today will be sold tomorrow.

    Two important things:
    - Do these LCD come with processor / memory integrated?
    - The price. Less than $5?
    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

  3. #3

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    Rayman,

    I'm just so amazed how you find these items at GOOD prices. I think your doing a great service to the prop community.

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    Prop Forum Search (Via Google)

    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

  4. #4

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    What is the pixel resolution? 320x240?

    Can you post the datasheet?

    Depending on the price, I am interested in a significant quantity of these displays.

    Andy
    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

  5. #5

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    resolution is 320x240. I just asked if I can post the datasheet...

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    My Prop Info&Apps: http://www.rayslogic.com/propeller/propeller.htm
    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

  6. #6

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    Which kind of connector ?

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    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

  7. #7

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    don't have one yet, but it looks like the same 60 pin connector that the 4.3" units have...

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    My Prop Info&Apps: http://www.rayslogic.com/propeller/propeller.htm
    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

  8. #8

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    This one looks to be more difficult to use though...

    You need to supply +18 and -10V for the gate voltage as well as +5V for analog logic.
    Also, you have to supply 6 capacitors.

    So, it's more difficult. Have to see if the price point makes it worthwhile...

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    Attached Thumbnails Attached Thumbnails Click image for larger version

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    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

  9. #9

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    This apparently needs more control Pin and three voltage converters.
    If the LCD has a module, maybe your supplier can give those parties, together with the connector. It would be a great savings.

    And the plastic box with the brand erased.
    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

  10. #10

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    At least you do not have to provide all the gamma correction voltages... (I have such a module, a very nice 800x600 6" panel).
    Two (maybe one) MC34063 can provide both potentials.

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    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

  11. #11

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    Here's a single chip solution for the voltages:

    http://focus.ti.com/lit/ds/symlink/tps65120.pdf

    Unfortunately, it's QFN, not one of my favorites, and with tiny pitch too... :(

    Hopefully, I can find something similar in an nicer easier to solderpackage...


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    Post Edited (Rayman) : 12/27/2009 9:00:10 PM GMT
    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

  12. #12

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    Good News! Pricelooks like it could be in the $10 range!

    Also, got a green light on the datasheet, so here it is:

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    Attached Files Attached Files
    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

  13. #13

    Default

    The qfn is not a problem but the breakout would cost more making it almost the same price possibly more then the 4.5" display

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    24 bit LCD Breakout Board now in. $21.99 has backlight driver and touch sensitive decoder.
    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

  14. #14

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    True, but these are brand new displays. Also, the 4.3" maybe too big for some applications...

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    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

  15. #15

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    I can do cheaper if making 1000 if they can all be sold.

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    24 bit LCD Breakout Board now in. $21.99 has backlight driver and touch sensitive decoder.
    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

  16. #16

    Default

    The one thing that the datasheet doesn't seem to expand too much on is the meaning of all the registers you can set via the SPI interface...
    Hopefully, we can figure out what they all do... I'm hoping they will let you do things like change scan direction so you can rotate the display more easily...

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    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

  17. #17

    Default

    Google found this C code with some SPI commands to initialize the display.
    The controller IC seems to be a S6F2002, but I don't find a datasheet.

    All in all this display is much more complicated than the 4.3".

    C code: tomoyo.sourceforge.jp/cgi-bin/lxr/source/drivers/video/backlight/ltv350qv.c
    Register definitions: tomoyo.sourceforge.jp/cgi-bin/lxr/source/drivers/video/backlight/ltv350qv.h

    Andy
    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

  18. #18

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    I saw something about one register allowing to switch from DE mode to sync mode... I'm hopeful that that will remove the need for a DE pin. I think that will make the pin count the same or close as with the 4.3" units...

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    My Prop Info&Apps: http://www.rayslogic.com/propeller/propeller.htm
    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

  19. #19

    Default

    Sounds like an interesting display. It probably would interface well with the Chameleon-Pic since it has 2 user definable SPI interfaces.

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    Will work for Propeller parts!
    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

  20. #20

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    Just got word that 100 of these displays have been shipped to me!

    Again, these are very interesting because there are ~1000 brand new ones available for a very low cost...

    If anyone wants to help develop a breakout board, let me know...

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    Last edited by ForumTools; 09-30-2010 at 06:39 PM. Reason: Forum Migration

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