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Thread: Why LCD controllers are so big, so much thicker than the panel itself?

  1. #1
    Mod - iPad Forums RipplingHurst's Avatar
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    Why LCD controllers are so big, so much thicker than the panel itself?

    I've seen lots of interesting panels on the market today (right now I'm looking for 4-6.5") screen for my overhead console) but the controller boards are so much bigger than the LCD itself, it's laughable.

    It looks that controllers are stuck in 20year old designs (by comparison, check it out iPad's controller at iFix.com), with huge capacitors and wire link and the complete absence of "one chip" solutions...

    Case in point, Boe-Hydis 5.6 screen, 180degree angle; 1280x800; all I want to just mirror my desktop, but...:



    WTF? :roflol:

  2. #2
    Maximum Bitrate tft_lcd_org's Avatar
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    Cost.

    Those cheap MIC displays are using off the shelf parts that are retrofitted to whatever EOL panel they buy.

    The cost to develop an AD board is not cheap. Plus, the smaller the footprint, the higher the cost.

  3. #3
    Mod - iPad Forums RipplingHurst's Avatar
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    Well, I'd think that by now those off the shelf parts would have been gone 10 years ago (about the time CRTs passed away). I think they are still producing them in droves unfortunately, unless they made billions of them.

    ---------- Post added at 12:30 PM ---------- Previous post was at 12:26 PM ----------

    Quote Originally Posted by tft_lcd_org View Post
    Cost.

    The cost to develop an AD board is not cheap
    Btw, I would have no problem with a digital only solution (DVI-D, HDMI, or display port, my tablet has one). I think that would make AD conversion unnecessary and the controller much smaller, no? Also cheaper, case in point, HDMI splitters were like $500 a couple of years ago, and you can find them now, HDCP ready and all, for $15-20.00...
    Meanwhile, HDMI to analog converters/splitter are still expensive.
    Last edited by RipplingHurst; 04-27-2011 at 02:33 PM.

  4. #4
    Constant Bitrate
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    The A/D board bundled with that screen comes from some legacy application and has too many features that you don't need...Ex. I can even see a TV Tuner.

    I've dealt with that ebay seller and he is quite responsive. Please ask if he has a smaller LVDS A/D board which could drive that panel

  5. #5
    Raw Wave
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    Funny thing is SMD etc is cheaper to manufacture and more reliable etc - but that requires design (not copy) and investment.

    But if needing high connectors, why bother? And look at that pictured board - it has a tuner and double stacked RCA's. My Dog, it's so ancient it's even an analog tuner!
    Integrated can be made smaller than a freestanding entity.

    This year iPad. Next year - its controller.

  6. #6
    Maximum Bitrate tft_lcd_org's Avatar
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    Quote Originally Posted by DigitalVampire View Post
    The A/D board bundled with that screen comes from some legacy application and has too many features that you don't need...Ex. I can even see a TV Tuner.

    I've dealt with that ebay seller and he is quite responsive. Please ask if he has a smaller LVDS A/D board which could drive that panel

    Yes, he is quite responsive. But, JW only sells what he can connect. He does not program LCD controllers, so he can only provide what he knows will work.

    ---------- Post added at 07:00 PM ---------- Previous post was at 06:59 PM ----------

    Rip, What input do you want for a 4-6.5" display?

  7. #7
    Mod - iPad Forums RipplingHurst's Avatar
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    I got an answer from him regarding a panel for the Samsung galaxy tab (7" but gorgeous). He said he has the controller, not the cable. Not a priority for me, but good to know. Still waiting on the other issue, what board can I connect to the hydis 5.6.

    tft_lcd, I'd like all the inputs possible, of course, but display port only would do. The best combo would be display port/one analog (vga or composite), that would cover all my possible uses, but display port should be fine, as long as it's smaller than most. What I don't like is boards with HDMI, DVI, VGA, component, composite...one digital, one analog should be enough, no?

    The thing with adding input options is the size of the controller board. I'd rather have cable extensions going into the board.

    I'm going to ask him if he can make something like a 12' cable from the LCD to the board (from the sunglass holder to the center console via A column), that way I could store that giant freak away somewhere and forget it even exists...LOL.

  8. #8
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    Hello RH,
    I am using the Digitalview ALR-1400 on my NEC custom transflective setup - nice and small, and not to expensive....

    See if you like it, and I hope the size is ok for you? Also nice, nifty cables you can get for it, decent vert/horiz button membranes, et al....
    F6 Tornado Project Log ; HP Blackbird Watercooled Server

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    Maximum Bitrate tft_lcd_org's Avatar
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    Quote Originally Posted by mrbean_phillip View Post
    Hello RH,
    I am using the Digitalview ALR-1400 on my NEC custom transflective setup - nice and small, and not to expensive....

    See if you like it, and I hope the size is ok for you? Also nice, nifty cables you can get for it, decent vert/horiz button membranes, et al....
    "130.00+ US is hardly "not too expensive..." for just an LCD controller.

  10. #10
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    It's not just an lcd controller, go read the manual.

    Allows quite a fair few options, connectivity to different panels, et al. It works for me, and was worth the money, but may not be suitable for everyone - if RH likes it, good, if not, no worries As someone has mentioned, small footprint = pricy.....
    F6 Tornado Project Log ; HP Blackbird Watercooled Server

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