Light source adjusting device and projection system comprising the same

摘要

A light source adjusting device and a projection system comprising the light source adjusting device are provided. The projection system further comprises a light source module which is capable of providing a first beam with a first wavelength. The light source adjusting device comprises a first angle selecting layer, a wavelength converting layer and a second angle selecting layer. The first angle selecting layer receives the first beam and allows a first portion of the first beam to pass therethrough to form a second beam that also has the first wavelength. The first portion of the first beam is a portion of the first beam that is less than an incident angle. The wavelength converting layer receives the second beam transmitted from the first angle selecting layer and converts the second beam with the first wavelength into a third beam with a second wavelength. The second angle selecting layer receives the third beam and allows the third portion of the third beam to pass therethrough to form a fourth beam that also has the second wavelength. The third portion of the third beam is a portion of the third beam that is less than an emergence angle. The second wavelength is larger than the first wavelength, and the emergence angle is less than the incident angle.

主权项

1. A light source adjusting device for a projection system, the projection system further comprising a light source module which is capable of providing a first beam with a first wavelength, the light source adjusting device comprising:
a first angle selecting layer for receiving the first beam and allowing a first portion of the first beam to pass therethrough to form a second beam having the first wavelength, in which the first portion is a portion of the first beam that is less than an incident angle; a wavelength converting layer for receiving the second beam transmitted from the first angle selecting layer and converting the second beam having the first wavelength into a third beam having a second wavelength; and a second angle selecting layer for receiving the third beam and allowing a third portion of the third beam to pass therethrough to form a fourth beam having the second wavelength, in which the third portion is a portion of the third beam that is less than an emergence angle; and the light source module comprises:
a light source for providing a light beam;a beam splitting unit, wherein the light beam passes through the beam splitting unit to form the first beam with the first wavelength; anda beam collecting unit for collecting the first beam to the first angle selecting layer;wherein the second wavelength is larger than the first wavelength, and the emergence angle is less than the incident angle;the first angle selecting layer is disposed on a first surface of the wavelength converting layer, and the second angle selecting layer is disposed on a second surface of the wavelength converting layer opposite to the first surface; andwherein a fourth portion of the third beam larger than or equal to the emergence angle is reflected by the second angle selecting layer, the fourth portion passes through the wavelength converting layer and then scatters from the first angle selecting layer at a scattering angle, and the scattering angle is substantially less than or equal to the incident angle; the fourth portion is then transferred from the beam collecting unit to the beam splitting unit, and the beam splitting unit reflects the fourth portion to the beam collecting unit so that the beam collecting unit collects the fourth portion to the first angle selecting layer.