A light source module includes a light guide member, a light exiting member, a first collimating light source, and a first light modulating member. The light guide member includes a first surface and a second surface disposed opposite to the first surface, the first surface is configured as a light exiting surface and comprise a light exiting region; the light exiting member is disposed on the first surface in the light exiting region; the first collimating light source is configured to provide a first collimated light; and the first light modulating member is disposed on one of the first surface and the second surface and configured to change a transmission direction of the first collimated light so as to make it incident into the light guide member and make at least part of the first collimated light meet a total reflection condition of the light guide member.