Keypad assembly for electronic equipment and method thereof

A method of illuminating a keypad assembly for electronic equipment, the method comprising:

• generating a first light of a plurality of light emitting units of the keypad assembly;
• guiding the first light through a light guide plate and toward a plurality of key buttons of the keypad assembly, each of the key buttons including a first image plate and a second image plats;
• a first reflection pattern reflecting the guided light toward the key buttons of the keypad assembly, the first reflection patterns disposed on the light guide plate and corresponding to the key buttons;
• a first optical layer converting the first light to a second light of a first color according to a wavelength of the first light generated, the first optical layer being disposed between the first image plates and the light guide plate of the keypad assembly;
• and
• a second optical filter layer blocking the second light of the first color and transmitting light having other wavelengths, the second optical filter layer being disposed between the second image plates and the light guide plate of the keypad assembly.

A method of forming a keypad assembly of an electronic equipment, the method comprising:

• disposing a plurality of light generating units at an incident side of a light guide plate, the light generating units emitting a first light;
• disposing a plurality of first key buttons on a top surface of the light guide plate, each of the first key buttons including a first image plate and a second image plate;
• forming a first reflection pattern on the light guide plate and corresponding to each of the first key buttons;
• disposing a first optical layer between each of the first image plates of the first key buttons and the light guide plate, the first optical layer being configured to convert the first light emitted from the light generating units into a second light of a first color according to a wavelength of the first light;
• and
• disposing a second optical layer between each of the second image plates of the first key buttons and the light guide plate, the second optical layer being configured to block the second light of the first color and transmit light having other wavelengths.

A keypad assembly for electronic equipment, the keypad assembly comprising:

• a keypad;
• light emitting units which each emit light of a different color and are selectively turned on to illuminate the keypad;
• a light guide plate which guides the light emitted;
• a plurality of key buttons disposed above the light guide plate;
• and
• a plurality of optical filter layers each corresponding to a respective key button and disposed between the respective key button and the light guide plate and which selectively receive or block the light emitted and transmits light having different wavelengths from each other depending on a state of the electronic equipment.