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LCD - 24bpp to LVDS Panels (odd and even channels)

Guilherme Haas
Intellectual 345 points
Other Parts Discussed in Thread: SN75LVDS83B, DS90C387, SN75LVDS83

Hello all,

I got a 17" LCD to communicate with the 'DM816x / C6A816x / AM389x DDR3 Evaluation Module' desiged from http://www.spectrumdigital.com. I gonna use a VOUT[0] and i need to convert  24-bpp to a LVDS standardized by VESA on PSWG 17 inch.

My question is that LVDS standardized by VESA works with odd (first pixel) and even(second pixel)  lvds channels, what should i do?  I was thinking to use SN75LVDS83B, but i can not converte the 24bpp to an odd and even channels with this CI .

 

 

  • 0
    TI__Mastermind 43875 points

    If you need dual stream LVDS for your LCD (typically for panels with greater than 1366x768 resolution) then you will need an LVDS transmitter which is able to receive single pixel in and convert to dual stream out. As you note, the LVDS83B cannot do this.

    I believe devices like the following can do this.

    CH7033 or CH7305 (Chrontel)

    IDTV105A (IDT)

    EP387A (Ineltek)

    BR,

    Steve

  • 0 in reply to Steve Clynes
    Prodigy 20 points

    hi

    Steve，

    I got a 22" LCD  that uses dual pixel (even/odd) LVDS signaling,can I use single pixel(odd) to display this LCD?

  • 0 in reply to Lynn1
    TI__Mastermind 43875 points

    Depends.

    If you send the same pixel data on both the channels then you will only get half the horizontal resolution that the LCD is capable of displaying (obviously). It will work, but probably not give the result you want.

    Having said this, this is really a question about the LVDS transmitter you are using, and not specifically a DM816x question.

    There are some LVDS transmitters which can accept a single stream parallel CMOS input and convert to dual channel LVDS output, so this is more likely what you want to use. Look at the DS90C387.

    Other LVDS transmitters only accept dual channel parallel CMOS inputs, which you can't use on the DM816x without driving both inputs with the same data, hence loosing half your horizontal resolution.

    Which LVDS transmitter are you using? What is the native resolution of the LCD panel? Is the datasheet available?


    BR,

    Steve

  • 0 in reply to Steve Clynes
    Prodigy 20 points
    hi,steven
    The LVDS transmitter is SN75LVDS83,,the native resolution of the LCD panel 1920x1080P.
    I do not have DS90C387,but I have a lot of SN75LVDS83.Can I use two SN75LVDS83 to achieve dual LVDS function?
  • 0 in reply to Lynn1
    TI__Mastermind 43875 points

    Unfortunately not without additional logic to split the single stream output from the DM816x into a dual stream that 2x LVDS83 would require. Timing would also be very critical in the dual LVDS83 scenario. The DS90C387 handles all this conversion and synchronization for you.

    If you do not already have hardware built I would seriously suggest switching to the 387.

    BR,

    Steve