Illuminated laptop keyboard with uniform illumination

摘要

A laptop keyboard in one embodiment includes a rectangular key printing film formed of an optically transmissive material and comprising keys; a rectangular luminescent sheet formed of optically transmissive silicone rubber, the luminescent sheet being mounted below the key printing film; an LED light source disposed to a side of the luminescent sheet; and a capacitive layer mounted below the luminescent sheet and comprising an insulative layer and pairs of upper and lower conductors wherein a pressing of the key changes capacitance of the pair of upper and lower conductors for typing or performing a predetermined command. Light emitted by the LED light source is directed to the luminescent sheet which in turn directs the light upward toward the key printing film.