• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 46 subscribers
  • Views 608 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LCD Gamma Buffer & Operational Amplifier

ahmed zakaria
Prodigy 55 points

Other Parts Discussed in Thread: LM6588

what is the difference between the 2 Products LCD Gamma Buffer and Operational Amplifier (Op Amp) ?

 

  • 0
    TI__Guru 66646 points

    Hello Ahmed,

    LCD Panels have a gamma bias line, that controls the "color correction" of the pixels. These lines run the entire length of the panel controlling the bias level of the MOSFETS gates, which results in a very large capacitance (100's of nF).

    LCD Panels are quite a nasty load and requires a device that can drive a large capacitance (100's nF), settles quickly and can drive high peak load currents (100's mA).

    There are dedicated gamma buffers in one package, like the BUF18xxx series, or high capacitive load drive op-amps like the LM6588 that were designed specifically to drive the panels directly.

    Even though it was designed to drive LCD panels, the LM6588 can be use as a "high capacitance drive" op-amp, since that is basically what it is. The 6588's datasheet actually has a section describing Gamma and Vcom drivers in detail if you are curious.

    So... "Gamma Driver" = "High Capacitance Drive Output Capability".

    Regards,