Uv light-blocking material with metal nanoparticles

A keypad assembly of an electronic apparatus comprising:

• a plurality of light-emitting devices;
• a light guide plate which directs light exiting from the plurality of light-emitting devices;
• a plurality of key buttons comprising a number keyboard and a word keyboard provided on an upper surface of the light guide plate;
• a plurality of reflection patterns which are provided on the light guide plate and which reflect light to the plurality of key buttons;
• a plurality of protrusions provided in a lower portion of a singular reflection pattern from among the plurality of reflection patterns;
• and
• a switch substrate including a plurality of switches corresponding to the plurality of protrusions, wherein a lower portion of the number keyboard in the plurality of key buttons comprises a color-converting light filter layer which changes light into various colors and which reacts or does not react depending on a wavelength of light formed from the light-emitting devices;
• and wherein the lower portion of the word keyboard in the plurality of key buttons comprising a UV light-blocking light filter layer which absorbs and blocks a UV light wavelength.