Expansion card with homogenized light output and light-homogenizing device thereof

A light-homogenizing device applied in a circuit board of an expansion card, wherein the circuit board comprises at least one light-emitting device disposed on a first side edge thereof, the light-homogenizing device comprising:

• a light-guiding body having a light-input side and at least one light-output side, wherein the light-input side and the light-output side are disposed on two opposite sides of the light-guiding body respectively, and the light-input side is adjacent to the first side edge of the circuit board;
• at least one light-diffusion element disposed on the light-input side of the light-guiding body and opposite to the light-emitting device of the circuit board, wherein the light-diffusion element and the light-output side are configured to form at least a light-transmitting path, and the light-diffusion element is configured to diffuse plural light beams entering into the light-guiding body from the light-emitting device;
• and
• at least one light-turning element disposed in the light-guiding body, located on the light-transmitting path and configured to turn the directions of portion of the light beams.