| 摘要 |
A keypad lighting arrangement adapted to transmit at least a portion of light emitted from light sources through a keypad so as to facilitate visual recognition of information expressed on keypad members of a keypad includes light sources, a photoluminescent diffusion sheet arranged over the light sources and containing a photoluminescent material for converting light from the light sources and a light-diffusing material for diffusing emitted from the light sources, and a keypad member over the photoluminescent diffusion sheet, wherein the light sources emit blue wavelength light and the photoluminescent diffusion sheet absorbs at least a portion of the blue wavelength light and converts the blue wavelength of light to a different wavelength of light.
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