Electronics companies are rolling out a slew of new gadgets this week at the Consumer Electronics Show in Las Vegas. Here are three trends for business owners to watch:

Mobile Devices with Built-In Projectors
Today, MicroVision unveiled a prototype of a mini-tablet with an embedded Pico projector that displays widescreen images as large as 100 diagonal inches. The prototype, which is roughly the size of most smartphones, but a bit thicker, runs on the Android 2.2 operating system and has a 3.5-inch touchscreen.

4G Wireless Devices
Fourth generation WiFi is rolling out slowly across the country. This week, companies will be unveiling a variety of tablets, smartphones, and wireless hotspot devices that are 4G compatible. In February, for example, Sprint will begin selling a 3G/4G Mobile Hotspot by Novatel Wireless that allows users to create WiFi hotspots on the go. The device is slated to cost $49.99 after a $50 mail-in rebate and $59.99 a month for unlimited 4G access and 5 GB of 3G access.

Android Tablets
Dozens of tablet computers will be on display at CES this year. The most promising ones are powered by the latest Android operating system, which has developed a loyal fan base in the smartphone market. Unlike the iPad, tablets equipped with Android 2.2 also have the ability to display Flash video. One interesting entry is Vizio's VIA Tablet, which has a 1 GHz processor, 8-inch touchscreen, and front-facing camera. Stay tuned for my hands-on review of the device in the coming days.