US 2005/0030481 A1Published application

Digital light processing projection system and projection method of the same

AssigneeDelta Electronics, Inc.

InventorsSean Chang, Sean Huang

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Abstract

A digital light processing projection system includes an illuminating device, an optical-path-switching element, a projection device and a prism set. The prism set is arranged between the illuminating device, the optical-path-switching element and the projection device and has a plurality of prisms in which an air gap existing between any two adjacent prisms. According to the invention, a light beam output from the illuminating device directly passes through the prisms and air gaps before being received by the optical-path-switching element. Under a first state, a light beam reflected from the optical-path-switching element is totally reflected at an interface between one of the prisms and one of the air gaps before being received by the projection lens. Under a second state, a light beam reflected from the optical-path-switching element is totally internal reflected back and forth within a prism being adjacent to the optical-path-switching element and is absorbed by a light absorbing material.

Claims20

Dependent claims

A digital light processing projection system comprising:

an illuminating device having a light source outputting a light beam;
an optical-path-switching element having a plurality of micro-mirrors for receiving the light beam and reflecting the light beam under a first state and a second state, respectively;
a projection device having a projection lens for receiving the light beam reflected from the optical-path-switching element under the first state;
and
a prism set arranged between the illuminating device, the optical-path-switching element, and the projection device, having a plurality of prisms in which an air gap exists between any two adjacent prisms;
wherein, the light beam output from the illuminating device directly passes through the prisms and air gaps of the prism set before being received by the optical-path-switching element;
the light beam reflected from the optical-path-switching element is totally reflected at an interface between one of the prisms and one of the air gaps next to before being received by the projection lens under the first state;
and the light beam reflected from the optical-path-switching element is totally reflected back and forth within one of the prisms being adjacent to the optical-path-switching element under the second state.

5 more elements

A projection method of a digital light processing projection system, wherein the digital light processing projection system has at least an illuminating device, an optical-path-switching element, a projection device, and a prism set having a plurality of prisms and air gaps, comprising the steps of:

guiding a light beam output from the illuminating device into the prism set, and having the light beam pass through the prism set without being reflected and reach the optical-path-switching element;
reflecting the light beam reaching the optical-path-switching element back to the prism set and then having the light beam be totally reflected into the projection device under a first state;
reflecting the light beam reaching the optical-path-switching element back to the prism set and then having the light beam be totally reflected at a interface between a first-encountered air gap and one of the prisms next to and then totally internal reflected back and forth within the prism next to the first-encountered air gap under a second state;
and
absorbing the light beam being totally internal reflected back and forth within the prism next to the first-encountered air gap under the second state.

2 more elements

Dependencies are inferred from the claim text.