A screen for portables usable in sunlight

If you already tried to use a laptop outdoors, you will have noted that it is difficult, and even impossible to have a display that makes it possible to work as soon as the ambient light becomes stronger than the retro-lighting.
LG will soon present a solution which could solve this problem. The manufacturer announced a LCD screen that inside will function in a traditional way, by using the retro-lighting (system known as adaptive), however outside will adopt to a transmissive mode, in which the retro will be cut and the screen will be lit by the ambient light as if there was a mirror behind the screen.
This system presents another significant advantage. If the ambient light is sufficiently bright, the battery life of the machine will be increased since the retro-lighting is cut.
This screen will be presented at CES 2009 that will be held from January 8 in Las Vegas.
Alas, it is not known if such a system improves the situation for the brilliant screens outdoors, such as those that Apple imposes on us now in its portables.