Abstract: A circuit board assembly includes a substrate, a flexible printed circuit board and an electrical component. The substrate includes a first electrically connecting port. The flexible printed circuit board includes a main body and a branch body. The main body includes two second electrically connecting ports opposite to each other. One of the two second electrically connecting ports is electrically connected to the first electrically connecting port. One end of the branch body is connected to the main body. Another end of the branch body is disposed with an additional electrically connecting port. The electrical component is disposed on and electrically connected to the additional electrically connecting port. The electrical component is electrically connected to the substrate via the flexible printed circuit board.

Abstract: The present invention is to provide a light guide pillar disposed on a circuit board of an electronic apparatus having a light emitting element disposed thereon, where the light guide pillar includes a bulk opaque and disposed on the circuit board for covering the light emitting element and a pillar with one end inserted into the bulk while the other end thereof extended outside of the electronic apparatus, enabling the light source generated from the light emitting element to be guided and displayed outside of the electronic apparatus via the light guide pillar and enabling the bulk to stop the light source emitted from the light emitting element from dispersing. Therefore, the light source can be guided to outside of the electronic apparatus without interference.