I'm not really sure what you're talking about. Your car's LCD has a USB port?
Does your LCD and whatever media player you want to use have an RCA connector? Sorry, your problem isn't that clear for me.
will this is the lcd im lookin for http://www.alibaba.com/product-gs/222101183/7_car_rearview_monitor_rear_view.html,
but i just need to know if there is a way of having a car lcd and watch videos in there, the hdd media player does what i kind want to ,but thats only for big resolution ( i think) , i need something simple, i just need a car lcd and like having a usb with my videos in it and play them in the lcd car