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Thread: need help selecting controller for iPad LCD

  1. #1
    Newbie lovely's Avatar
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    need help selecting controller for iPad LCD

    The controller needs analog video input support (composite or s-video)

    The iPad display is a 9.7" LVDS panel with a 1024x768 resolution.

    The full datasheet from LG can be downloaded here: http://www.displayalliance.com/stora...97X02-SLAA.pdf

    I choose this particular display because 10" size is nice and because of IPS technology gives a wide viewing angle and nice crisp color.

    Any recommendations at all are welcomed with open arms.

  2. #2
    Mod - iPad Forums RipplingHurst's Avatar
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    Humm, interesting stuff. Now where can we find a controller for this?

    Some data:

    General Features
    Active Screen Size 9.7 inches diagonal
    Outline Dimension 210.53(H) 166.53 (V) 3.51(D, Max.) mm ※ PCB area : 5.82(Max.)
    Pixel Pitch 0.192 mm 0.192 mm
    Pixel Format 1024 horiz. by 768 vert. Pixels RGB strip arrangement
    Color Depth 6-bit, 262,144 colors
    Luminance, White 200 cd/m2
    (Typ., @I
    LED=TBDmA)
    Power Consumption Logic : 0.8W(typ.@Mosaic), Back Light : TBDW (typ.@ I
    LED= TBDmA)
    Weight 156g (Max.)
    Display Operating Mode Transmissive mode, normally Black
    Surface Treatment Glare, Anti-reflective treatment of the front polarizer, 3
    How can it be so brilliant and bright and contrasty with only 200 cd/m2? That's about the same as the cheapest Lillis...My Xenarc 700TSV has something like 500 cd/m2...and it's nowhere close! LOL

    I wonder if they had another source (not LG) for the backlight though.


    Surface Treatment Hard coating(3H), Glare treatment of the front Polarizer (Haze 0%
    IF this is really the iPad display, whatever they did, it works great. Not perfect, but good enough I think.

  3. #3
    Variable Bitrate FPeter's Avatar
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    Quote Originally Posted by lovely View Post
    The controller needs analog video input support (composite or s-video)
    ...[/IMG]
    dont You planning to use it as carpc monitor? or do You mean VGA/DVI/HDMI + analog video input support?
    "case": Skoda Superb Elegance 1.8T
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  4. #4
    Mod - iPad Forums RipplingHurst's Avatar
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    Yeah, that would be what I'd like to have: dvi or vga at least.

  5. #5
    Variable Bitrate FPeter's Avatar
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    Quote Originally Posted by RipplingHurst View Post
    Humm, interesting stuff. Now where can we find a controller for this?
    ...
    IF this is really the iPad display, whatever they did, it works great. Not perfect, but good enough I think.
    typical 600:1 contrast ratio with 200 cd/m2 brightness - the first one is correct, but the last is a bit low - im still waiting for ~10 col AMOLED panels...

    the largest problem with controller boards are the support and documentations. they are under NDA and will not be shared with a simple mortal like us... i gave it up...

    i had a plan to drive a panel myself with a Texas TFP401/403 or Analog AD9398/9880 receiver chipset - but they dont support scaling itself - so only the native resolution of the panel can be used. i gave it up too, then i bought my Lili FA1011...

    and now i realised during hacking the FA1011 that the unsupported scaling is not a real huge problem if You use a modern VGA card like ATi 4xxx (older cards might be ok too but i dont know, from which time is it supported. Radeon 7000 does not support it)

    so, when i connected the FA1011 with hacked EDID to my HD4850, i found that the resolution on BIOS level / during bootup is 1024x600 - so, with correct EDID infos and modern videocard, the missing scaling support on the monitor side is not a huge problem!

    the options are:
    - TFP4xx from TI: only DVI/HDMI input without audio, works in passive mode without extra programming
    - AD9398 from Analog: only DVI/HDMI with 8CH HDMI audio, but complicated programming is required
    - AD9880 from Analog: DVI/HDMI with 8CH HDMI audio, 2x analog inputs, but complicated programming is required

    they all have parallel RGB outputs, so for an LCD panel with LVDS input, further processing is required by a TI SN75LVDS83 for example - its passive too, programming is not required

    so, tons of reading and DIY-ing is required... they can be found in TQFP100 package - its annoying for the first time, but much more easier to solder an IC like this with good soldering iron and soldering paste than i think for the first time. its not an impossible project !

    sorry for my english, i will try to explain it on other way if required
    "case": Skoda Superb Elegance 1.8T
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  6. #6
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    Perhaps this controller might work: http://cgi.ebay.com/R-RT6251-LCD-Con...ht_7534wt_1060

    Email the seller (njytouch) and send him the datasheet he will say whether the controller will work.

  7. #7
    Maximum Bitrate tft_lcd_org's Avatar
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    Quote Originally Posted by vat2010 View Post
    Perhaps this controller might work: http://cgi.ebay.com/R-RT6251-LCD-Con...ht_7534wt_1060

    Email the seller (njytouch) and send him the datasheet he will say whether the controller will work.
    They don't have the necessary cable for that LCD.

    The controllers will work, and they will scale. I use them for a lot of my builds.

    But, when it comes to support, well let's just say you need to know what you are doing.
    NJY has good pricing (shipping is BS high though) but they are not very tech savvy when it comes to their products.

    And don't get me started on their multi-touch panels........

  8. #8
    Mod - iPad Forums RipplingHurst's Avatar
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    Thanks for the info. Awesome, saved me some time emailing the guy.

    Could you make that cable?

  9. #9
    Maximum Bitrate tft_lcd_org's Avatar
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    Quote Originally Posted by RipplingHurst View Post
    Thanks for the info. Awesome, saved me some time emailing the guy.

    Could you make that cable?
    I have the 40 pin version, but not 30 (which the 9.7 uses).

    Very hard to locate, especially in the US.

  10. #10
    Mod - iPad Forums RipplingHurst's Avatar
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    Well, if you find them, please get back to us.

    But even if you do, I wonder if these screens come with the capacitive panel and if we could make it work...

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