Teleprompter

A teleprompter, comprising:

• an accommodating space configured for accommodating an electronic device, wherein the electronic device comprises an image display unit and a lens, and the image display unit is configured to emit a light along a first path,
• wherein the lens is disposed on a first surface of the electronic device, and the image display unit is disposed on a second surface of the electronic device opposing the first surface;
• and
• an optical assembly disposed in the accommodating space and comprising a light-reflecting unit and a beam-splitting unit, wherein the light-reflecting unit is configured to divert the light from the first path to a second path, the light-reflecting unit has a first light-reflecting portion, a second light-reflecting portion, and a third light-reflecting portion,
• wherein the first light-reflecting portion is disposed on the first path and is configured to divert the light from the first path to a fourth path, the third light-reflecting portion is configured to divert the light from the fourth path to a fifth path, the second light-reflecting portion is configured to divert the light from the fifth path to the second path,
• the beam-splitting unit is disposed on the second path and is configured to allow a first portion of the light to transmit and to divert a second portion of the light from the second path to a third path, and the third path has a same direction as a direction of an optic axis of the lens,
• wherein the first surface of the electronic device faces the beam-splitting unit, and the second surface of the electronic device faces the first light-reflecting portion of the light-reflecting unit.