If using the Fn+F6/F7 keys do not brighten or dim your display and it's not a result of a power option (power / battery save) option, it may be hardware related. It sounds like either the 'backlight' in your internal LCD display or the laptop's FL inverter board is defective. When the backlight is not present, as in the two situations above, you can still faintly see the display although, it is very dim/dark.
The backlight is a very thin fluorescent tube at the base of the LCD panel. The backlight is built into the LCD panel. Fluorescent tubes are fragile and break easily. The FL inverter board is a small circuit board that ramps up the voltage going to the backlight and is controlled by the system board. In most cases like yours, the backlight is the failing component. The fix would require replacing the laptop's LCD panel which includes the backlight. If you have an extended warranty, I recommend contacting Toshiba. If the laptop is not under warranty, you could take it to a local ASP and have it diagnosed. Sadly, replacing the LCD panel out of warranty can be a bit pricey.
http://laptopforums.toshiba.com/t5/Video-Display/Monitor-Blank-with-P205-S6327/td-p/22593;jsessionid=102A55EE191547354F1E7278A0A585CC
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