High definition DLP zoom projector lens design with TIR prism for high definition television (HDTV)

In today's digital age, digital projectors and their application are gaining in significance, especially in the home theater area. We have to pay more attention in our design than ordinary data projectors designers do to the enhancement of both definition and contrast for home theater projectors and this complicates the optical design of the projector. In this paper the lens design samples focused on the application of a projector with a DMD (Digital Micro mirror Device) system. With the DMD device, there are three different optical engine designs at present: non-telecentric, telecentric with a TIR (Total Internal Reflection) prism and Field Lens types. The lens design using a TIR prism will be discussed in this paper. Such lenses have the telecentric design on the image side because of the TIR prism. The Lens design with 1.6X zoom ratio for 1080P resolution will be presented and its limitations regarding performance, F-number and zoom ratio will be discussed.