On March 5, 2009 ASUS announced its Wireless EzLink LCD monitor. The EzLink technology allows for connecting the monitor via Wireless Host Controller Interface (WHCI) or Wireless USB HWA (Host Wire Adapter). The company claims the EzLink technology-based LCD monitor will offer the same performance levels as conventional monitors. I have my doubts, but we’ll see.
A cable-based USB connected LCD monitor has a limited throughput that maxes out at a pixel format of 1600 x 1200 or 1680 x 1050. That’s because of USB 2.0’s bandwidth limitation. Products from DisplayLink, for example, won’t be able to drive your shiny new 24″ LCD monitor at its native pixel format: 1920 x 1200. And even at 1600 x 1200 the video updates considerably slower than with a DVI or HDMI cable. I know… not everyone runs a display at 1920 x 1200 so there is clearly a large market for these USB-based technologies.
With USB 3.0 you could get 1920 x 1200 and way beyond but we’ll need to wait a while before we see USB 3.0-based products. So there is only one way for a wireless USB technology to have similar performance levels as conventional monitors: the pixel format will need to be equal or less than 1600 x 1200, which is a level at which the majority of LCD monitors are.