Patent ID: 7446274

Claim:
A keypad assembly for electronic equipment, the keypad assembly comprising: a plurality of light emitting units generating light; a light guide plate through which a first light emitted from the light emitting units proceeds; a plurality of first key buttons disposed on a top surface of the light guide plate, each of the first key buttons including a numeral key plate and a character key plate; a plurality of first reflection patterns disposed on the light guide plate and configured so as to reflect light toward the first key buttons; a plurality of first protrusions disposed under the first reflection patterns; a switch substrate including a plurality of switches corresponding to the first protrusions; a first optical filter layer disposed between the numeral key plates of the first key buttons and the light guide plate, the first optical layer configured so as to convert the first light emitted from the light emitting units into a second light of a first color according to a wavelength of the first light emitted from the light emitting units; and a second optical filter layer disposed between the character key plates of the first key buttons and the light guide plate and configured to block the second light of the first color and transmits light having other wavelengths.