The "51-pin" refers to the physical connector shell, usually a series (Hirose) or compatible flat cable connector.
If you have a 51-pin LVDS cable or panel, check the physical connector against these common series: 51 pin lvds pinout datasheet
is predominantly found in high-resolution displays (like Full HD and 4K TV screens) or dual-channel, 8-bit, and 10-bit color depth environments. The "51-pin" refers to the physical connector shell,