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Thread: Successful LVDS LCD installations?

  1. #21
    Maximum Bitrate Yuriy's Avatar
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    I bought 3 laptop LCDs (800x600 including the motherboards and everything) for $23 off eBay. Whether you can hook one up to a different system is another question.
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  2. #22
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    Quote Originally Posted by Yuriy
    I bought 3 laptop LCDs (800x600 including the motherboards and everything) for $23 off eBay. Whether you can hook one up to a different system is another question.
    I have my friends' old laptop.... thought of using the lcd, but i can't even open the damn think

  3. #23
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    I cross-posted this in another motherboard-specific thread, but in case anybody hasn't seen it...

    MP3Car.com Keychains


    I now have my 8.4" LVDS LCD panel working successfully, and it's beautiful!

    It's attached directly to the motherboard like a Laptop LCD panel would be, which frees up the external analog VGA port for a secondary monitor.


    Turns out that most of the difficulty I had earlier was due to a wrong chart for one of the connectors.. once I fixed that, it came up easily.


    Now that I've managed to do a successful LVDS LCD panel installation, I should be able to help others do the same...


    Perhaps a (sticky) FAQ is in order?

    There's a lot of information on LVDS out there, and a FAQ thread would help others.

  4. #24
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    Thats Awsome Giuliano

    Would it be possible for you to post a parts list and a possible write up on your project?

    Also Have you completed your modified dash piece in you WRX.
    maybe think about selling some dupes of your mounting brackets to a fellow Suby

    regards?

  5. #25
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    Quote Originally Posted by jsinp
    Thats Awsome Giuliano

    Would it be possible for you to post a parts list and a possible write up on your project?

    Also Have you completed your modified dash piece in you WRX.
    maybe think about selling some dupes of your mounting brackets to a fellow Suby

    regards?
    Sure thing...

    This thread covers most of the LCD-specific stuff, and has most of the pictures:

    Thread: 8.4" LCD in WRX dash.
    8.4" LCD in WRX dash.


    Here's a summary of the parts list for the LCD itself..

    From Digikey.com:

    Hirose DF13-40S-1.25C
    5 H2234-ND CONN SOCKET HOUSING 40POS 1.25MM $2.70
    (LVDS connector shells for the motherboard, shell only, no contacts)

    Hirose DF13-2630SCFA
    100 H9991CT-ND CONN CONTACT 26-30AWG CRIMP GOLD $5.49
    (contacts for the DF13-40S-1.25C shell)

    From www.evisiondisplays.com, contact Bill Hutchins (President)
    EVD084S03-DSOT - 8.4" LVDS LCD w/ sunlight-readable brightness enhancements (~325 NITS) and touchscreen: $392 (was $428!).
    Inverter CXA-K0612-VSL $25.00
    Inverter input cable 51021-05-12D $3.00
    USB Touch screen controller N16B-0558-B710 $25.00
    T/S cont. USB cable Cable/RTP/USB $20.00
    20" LVDS cable, $15
    Subtotal: $480

    The LCD panel itself is a single-tube LCD, so if you want a brighter one, they have a new AU Optronics LCD model G084SN05 with 2 tubes for $433, but it's 30mm too tall for my WRX.


    The above does not include the LV-671, or the Subaru Gauge Pod housing, or a few other odds and ends..


    I haven't completed the modified bezel yet, as I need to get the LCD mounting brackets done first..

    And at this point I'm thinking of picking up a desktop milling machine ($500) so I can make the brackets out of aluminum...


    Duplicates of the mounting brackets, if desired, would probably be designed up for CNC milling, and sent out to some place like emachineshop.com for a small-quantity run.

  6. #26
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    Nice work Giuliano!

    I am undertaking a similar product using the 10.4" NEC LVDS LCD panel (NL10276BC20-04) and the Commell LV-673 mini-ITX.

    I noticed that you bought an inverter to power your backlight - was there not a high voltage output for the LCD backlight on your motherboard? I was wondering if anyone on this message board had any experience with my particular mini-ITX, since getting questions answered from Commell in Taiwan is a challenge.

    1) The LV-673 is dual OR single channel LVDS out, right? I believe my LCD is single channel LVDS.
    2) Does this motherboard have an adjustable voltage output to drive the LCD backlight?

    Thanks!

  7. #27
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    Quote Originally Posted by ctown
    Nice work Giuliano!

    I am undertaking a similar product using the 10.4" NEC LVDS LCD panel (NL10276BC20-04) and the Commell LV-673 mini-ITX.

    I noticed that you bought an inverter to power your backlight - was there not a high voltage output for the LCD backlight on your motherboard? I was wondering if anyone on this message board had any experience with my particular mini-ITX, since getting questions answered from Commell in Taiwan is a challenge.

    1) The LV-673 is dual OR single channel LVDS out, right? I believe my LCD is single channel LVDS.
    2) Does this motherboard have an adjustable voltage output to drive the LCD backlight?

    Thanks!
    That LCD panel should do well, it's an 18-bit 1024x768 LVDS panel, probably single channel. Dual-channel LCD's are usually much larger, upwards in the desktop size displays.

    An inverter is required for all LCD panel backlights, as the voltage required to drive the CCFL lights is somewhere in the range of 1200V AC, but at a low current..

    Hence, the inverter takes 12v DC from the motherboard, and inverts it into high-voltage AC to power the light.

    The high voltage is also why the wires on the CCFL light must be short (~3"), as you wouldn't want to drive such a high voltage over a longer cable.



    As for the LV-673, its LVDS output should be able to drive 18-bit or 24-bit LCD's, either single or dual channel. It's all in how many wires you use, and how you wire it... making cables is extremely difficult, as the pins are tiny.

    You can go about 3 feet in length with 30-gauge (very thin) unshielded twisted pair wiring without getting signal interference.. Longer is possible, but may require shielding.


    I don't know if the LV-673's LCD inverter power source can supply variable voltage for the dimming functions on most inverters.. I know my LV-671 didn't, as the backlight is on full power all the time.

    For the inverter that I have, I can wire up a rheostat and some resistors to control the voltage, making a manual dimmer... haven't done that quite yet, though.

  8. #28
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    Good stuff.

    If you wire up a rheostat to the motherboard's inverter power source, are there any special considerations with the high voltage and high frequency? I might be way off, but I'm picturing a simple voltage divider across the inverter output on the mobo. Would a rheostat be able to dissipate enough power when dropping a large amount of voltage?

  9. #29
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    Quote Originally Posted by ctown
    Good stuff.

    If you wire up a rheostat to the motherboard's inverter power source, are there any special considerations with the high voltage and high frequency? I might be way off, but I'm picturing a simple voltage divider across the inverter output on the mobo. Would a rheostat be able to dissipate enough power when dropping a large amount of voltage?

    It's not quite like that.. the brightness control is on the low-voltage end of the inverter, and works like this, at least for my inverter:

    When the brightness wire is connected to ground, or 0V DC, the inverter gives full power to the backlight - full brightness.

    When the brightness wire is connected to 2V DC, the inverter gives minimal power to the backlight - minimal brightness, almost "off".


    So the thought goes something like this - take a 5V DC power source, commonly found on the motherboard, and step it down to 2V DC with a power regulator or the like...

    Attach a rheostat in between that 2V DC source and the inverter's input, and you've got your manual dimmer control.


    This is pretty common in CCFL inverters, but it can vary - some take a pulse-width signal instead of a flat DC voltage to control the brightness.

    Those can be fed a signal from a 555 timer integrated circuit, depending on the frequency of the pulse that is required.. attach a rheostat to the 555, and you've got an adjustable-frequency pulse and a brightness control.

  10. #30
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    Also, the LCD inverter power connector on the LV-671, and probably the 673 as well, has 5 pins, of which one is the 12V DC power source for the inverter, and another is the "enable backlight" signal. The other 3 are grounds..

    None of those signals you would want to adjust with a rheostat.. the inverter needs 12V DC power regardless, and the "enable backlight" signal is a strictly on/off signal..

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