1. Home
  2. Embedded Programming
  3. LVDS-based LCD Display, Minimum Clock Rates

LVDS-based LCD Display, Minimum Clock Rates

I have a question regarding the minimum clock rates allowed on LVDS- based LCD display panels. Perhaps someone in the group has some expertise here.

I have HD data coming in at 30 frames per second. I have no place to store a full frame. The HD display panel requires a minimum clock rate of at least 50 MHz (which, according to the display data sheet, equates to about 50 frames per second). I'd like to drive it at about

36 MHz. Even if I had a frame buffer, the I/Os are not fast enough to drive the display at more than about 300 megabits per second (the LVDS is emulated with external resistors).

Do you know if the minimum specified clock rate is the absolute minimum guaranteed clock frequency to guarantee that the display operates, or is it the minimum clock frequency to guarantee the display's specified response time? Will the display actually operate with a lower clock frequency. I know that I should ask this of the vendor, but unfortunately, there is little support for this display.

I have tested another vendor's LCD display at well below the data sheet specified frequency and it operated just fine.

Thanks in advance for any advice you might have.

Reply to
Prevailing over Technology
Loading thread data ...

Good question, one I have asked some years back myself. I wish I had got the answer. The minimum clock frequency spec began to appear perhaps 5 years ago or less. I don't remember why now but I think TFT panels which won't work below that frequency (my level of certainty is pretty low on that, however). I have had displays which will operate at much much lower frequencies, however below a certain one their contrast etc. parameters won't meet their spec (the gates of the TFT can only hold charge for a limited amount of time, if you have seen how a display fades into rainbow colours a second or so after losing its clock etc. signals you'll know what I mean). I suppose the bottom line is "check that display you will use"...

Dimiter

------------------------------------------------------ Dimiter Popoff Transgalactic Instruments

formatting link

------------------------------------------------------

formatting link

Reply to
Didi

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.