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Portable PCs should have a light sensor and adjust the display brightness depending on the environmental
Ambient Light Sensor
Some of them already do.. [Jim, Apr 08 1999]
One of my recent ideas!
Which probably means it is still not baked!! [kamathln, May 20 2009]
||These exist in TVs (my friend a long time ago had a big old console TV with a photoresistor that adjusted the brightness).
||Thats right, my TV (a simple JVC) has an option that adjust brightness by reading the brightness in the room.