Author Topic: Interfacing LVDS laptop screen with fpga  (Read 1518 times)

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Offline LopfiTopic starter

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Interfacing LVDS laptop screen with fpga
« on: February 17, 2022, 10:43:37 am »
I have a few old laptops of the same model and wanted to try to show something on the screen(datasheet attached) without the laptop hardware and play around a little bit with fpgas. But after reading a bit about LVDS something stood out to me. The mentions the LVDScommon voltage of the screen to be 1.25V but all FPGAs and even most IC's use 1.8V or higher for LVDS.  So am I missing something or is this just a weird voltage to use with LVDS? And if so do you know any FPGAs or IC's I could use to interface with the screen?


 
 

Offline mon2

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Re: Interfacing LVDS laptop screen with fpga
« Reply #1 on: February 17, 2022, 11:22:09 am »
 
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Offline mascotte

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Re: Interfacing LVDS laptop screen with fpga
« Reply #2 on: March 08, 2022, 09:07:10 am »
Common mode of LVDS is always 1.25V, this is specified in the corresponding standard. What you think of is the bank voltage of the FPGA, some have LVDS IOs that can be powered e.g. with 1.8V, 2.5V, 3.3V, but nevertheless they will output a common mode of 1.25V.  :-+
 
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