1. Home
  2. Embedded Programming
  3. Sony ACX705AKM lcd display

Sony ACX705AKM lcd display

Someone mentioned this lcd a while back, and out of curiousity I looked up the datasheet on it. I'm very new to electronics, and I have no delusions of being able to actually use one of these just now, but I'd like to understand (at a very high level) how they work.

There were specifications for a master clock, a horizontal sync, a vertical sync, and rgb info. So, what I gathered from this document is as follows:

  1. Each tick of the master clock, the rgb info is read for a pixel.
  2. At the end of each row, a vertical sync is done (which is a specific set of signals lasting some number of ticks of the master clock)
  3. After every 200 lines, there is a vertical sync (which is again a little routine that is performed and lasts a predefined number of clock ticks) This seems a bit strange to me since there are 160 lines in the display, but maybe that kind of thing is normal.

Anyway, I know most of you probably have not looked at the specs for this lcd, but does this sound like generally how they work?

thanks, Art

Reply to
Art
Loading thread data ...

Sounds like it is emulating a TV display. I'm assuming you meant that a horizontal sync is done at the end of each line. :-)

On a regular TV, there is a period of time where the electron beam is "moved" from the bottom of the screen to the top. This is what vertical sync is. This is mostly why there is a difference between the number of lines total and the number of lines displayed. TVs also turn the beam off a little before reaching the very bottom of the tube and don't turn it back on until several lines after the beam reaches the top. The total time between turning the beam off to turning back on is called the vertical blank period.

Reply to
Gary Kato

I was thinking of rows and columns. I suspect this is a joke at my expense, however I don't know enough about it to get the joke :)

After Looking back at the document, your exactly correct. The sync happens, between each refresh of the screen (maybe using the wrong terms again), and there are some "extra" rows in there.

Thanks very much for the help in understanding this.

One other question ... There are 2 conections labeled MIC1 and MIC2 with no further explaination. Any idea what those would be for? Again, just curiousity.

Art

Reply to
Art

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.