Has anyone converted a Digital Picture Frame to PC monitor?

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I have been trying to find a small cheap monitor for my Laptop to use in my car to display Microsoft Streets with the laptop in the back seat and the cheap monitor in the front. So far the cheapest monitor in the 7" to 9" range that I have been able to find costs over $300! I have tried a portable DVD player with Video In but the resolution is not good enough to read the words on the display. I was wondering if anyone has taken one of those digital frames apart to see if they could be used as a PC monitor??