Multi-touch LCD from LEDs

[Thomas] promised nearly a year ago he would give the community code and schematics of how he made his LED Multi-touch panel, but we would have to wait for his next version first. Well its finally here, bigger and better then we could ever have imagined. His new version is organized as a 48 by 32 matrix of 1536 LEDs, but he’s gone further by placing it behind a stripped LCD to make a multi-touch display. It doesn’t seem nearly as fast or accurate as the original, but potentially could be more portable than ones we’ve seen before. And yes, this time around he included how his LED matrix is made.

Comments

  1. digidev says:

    sweet/1

  2. tjhooker says:

    Nothing code and circuit refinement can’t improve.

    I’d like to use this but I don’t see it being cheaper than an actual touch screen lcd+controller part.

  3. Einomies says:

    Wouldn’t OLED displays be naturally suitable for this sort of touchscreen technology?

    All you’d have to do is scan the monitor in a travelling grid pattern every now and then to see if there’s any change, and once you find a finger or some other object, you can scan that area faster and more precisely to see what it does.

    And the bonus trick is, that you can use a laser pointer as a stylus.

  4. ian says:

    lol, anyone can do that on an lcd, if they push hard enough.

  5. TD-er says:

    “Wouldn’t OLED displays be naturally suitable for this sort of touchscreen technology?”

    Yep, it certainly would.
    Only disadvantage is that you’ll have to light some pixels to get a reflection on the neighbouring pixels.
    This either means you can’t use it on a black screen/window, or you’ll have to use invisible light.
    This can be done by using a 2×2 grid of subpixels ordered like R,G,B,IR.
    The touch-detection could be done in the display-controller chip, which means the costs can be really low.

    I’m not sure about the wavelength sensitivity for coloured OLEDs, but if IR-LED’s are more sensitive to IR-light, compared to other coloured OLEDs, you could start sampling when there is a change in IR-reception in order to save power.

  6. Einomies says:

    Technically, an OLED screen would also work as a low resolution scanner. You’d simply flash red, record the reflection, then flash green, record the reflection… etc.

    And you could use it on a black screen without having and IR led if you allowed some individual pixels to turn on occasionally and flash faster than you can see. Whenever a finger is detected, more pixels can light up because you won’t see them beneath your finger anyways.

  7. r4 dsi says:

    This LCD is very nice .In LCD we can see picture in very high resolution and in it we enjoy digital result of the picture.In LCD picture look very original and very clear which attract all of us.The sound quality of this LCD very clear.I will plan to buy this kind of LCD for my personal use.Thank you for this post.please keep posting like this with this useful information.

  8. Nintendo Guy says:

    I think the regular touch screens are good enough for now.

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