Does a portable secondary laptop LCD monitor exist?

Samsung's Lapfit LD220G and LD190N are secondary LCD displays for notebook PCs. The Lapfit displays allows laptop users to get a dual display easily.

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The Lapfit LD190N connects using the tradition VGA cable while the LD220G gets both VGA and UbiSync USB for video input. The latter serves also as a USB hub. The 22-inch LD220G features 1920×1080 pixels full HD resolution while the 19-inch LD190N has 1360×768. They both have 250 cd/m2 brightness, 20,000:1 dynamic contrast, and 5 ms response time.

The Samsung Lapfit LD220G and LD190N are priced at US$249.99 and US$149.99 respectively.

Nanovision offers some smaller (7") USB displays:

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