negative voltage for tft transistor

Discussion in 'General Electronics Chat' started by leoss, Jan 17, 2012.

  1. leoss

    Thread Starter New Member

    Jan 17, 2012
    14
    0
    Could you please explain me what mean negative voltage in lcd terminology? Because I read that tft transistor is switched OFF by negative voltage (-6V). But what is difference between possitive and negative voltage in this case?

    Thanks
     
  2. praondevou

    AAC Fanatic!

    Jul 9, 2011
    2,936
    488
    Please post your source. Where did you read it?
     
  3. leoss

    Thread Starter New Member

    Jan 17, 2012
    14
    0
  4. praondevou

    AAC Fanatic!

    Jul 9, 2011
    2,936
    488

    In the first post you say that you found an article stating that the TFT is being switched of with -6V. In your most recent post you say you can't find an article with this information.. :confused:

    These transistors are much like MOSFETs, for an n-channel transistor a positive voltage is being applied to the gate (with respect to the source), for a p-channel it's a negative voltage (also with respect to the source).
     
  5. leoss

    Thread Starter New Member

    Jan 17, 2012
    14
    0
    Sorry, but in first article I wrote, that I read it, but I see many articles per day and I cannot remeber on it. And this is clear for me, but I dont know what mean negative voltage in tft terminology. I read that in lcd is Vcom like ground and Vcom has about 7,5V. So this -6V is what? Is it minus because Vcom is 7,5V and it is under or because it is on another side of source?
    Thanks
     
  6. praondevou

    AAC Fanatic!

    Jul 9, 2011
    2,936
    488
    Well then it would be very helpful if you find the article talking about -6V again and post a link here. ;)
     
  7. leoss

    Thread Starter New Member

    Jan 17, 2012
    14
    0
  8. leoss

    Thread Starter New Member

    Jan 17, 2012
    14
    0
    It is possible, that this tft transistor is turned off by 6V voltage? Because I think, that it is negative, just due to Vcom is reference ground and it is around 7V.
     
Loading...