The disclosure provides a light guiding plate, used in a backlight module. The light guiding plate comprises a main board body and a sub board body. The main board body has an illuminating surface, a back surface opposite to the illuminating surface, and a first incident surface connected with the illuminating surface and the back surface. A plurality of quantum dots is uniformly embedded inside the sub board body. The sub board body is disposed on the first incident surface. The sub board body completely covers the first incident surface. The sub board body has a second incident surface, and the second incident surface is away from the first incident surface. The second incident surface is disposed opposite to a backlight source of the backlight module. The disclosure further provides a backlight module and a display.