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On Screen Displays with TV's

Discussion in 'Electronic Basics' started by grdthato, Aug 4, 2005.

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  1. grdthato

    grdthato Guest

    Does anyone know how an On Screen Display works? For example, comcas
    digital cable. How are text, menus, and graphics displayed an
    overlayed? What type of electronics are needed to do this
     

  2. The same way its done in newer TV seds, with a chip designed to do
    the OSD funtion. There a re a lot of ICs made for the job. Try a
    search engine and a few well worded searchs will give you datasheets and
    sample circuits.

    --
    Link to my "Computers for disabled Veterans" project website deleted
    after threats were telephoned to my church.

    Michael A. Terrell
    Central Florida
     
  3. There are dedicated chips that do this.
    You can get ones that take composite video in overlay the text and
    output analog again, like the STV5730A.
    Others are RGB devices with bigger memory for multiple pages and full
    graphics. Phillips makes some that have 8051 micros embedded in them to
    control it.
    Others might be integrated into the main TV chipset, considering it's
    all "system on chip" these days.

    Dave :)
     
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