Optical structure of LED liquid crystal projector with single polarization converter

Abstract

The invention provides an optical structure of an LED liquid crystal projector with a single polarization converter, comprising a lighting optical shaft and an imaging optical shaft which are vertical, wherein an LED, a collimating lens, a single transmission polarization converter, a lens array and a repeater light set are orderly arranged on the lighting optical shaft; an LCOS liquid crystal display, a PBS and a projection lens are orderly located on the imaging optical shaft; or the optical structure of the LED liquid crystal projector with the single polarization converter comprises two lighting optical shafts and an imaging optical shaft; the LED, the collimating lens and the single transmission polarization converter are orderly located on a first lighting optical shaft; the lens array and the repeater light set are orderly arranged on a second lighting optical shaft; the LCOS liquid crystal display, the PBS and the projection lens are orderly located on the imaging optical shaft; the first lighting optical shaft is parallel to the imaging optical shaft; and the first lighting optical shaft and the imaging optical shaft are both vertical to the second lighting optical shaft. The optical structure can convert the polarization light via the single transmission polarization converter or the single reflection polarization converter; and the optical structure is small in volume, high in light efficiency, low in cost and simple in machining and assembling.

Description

technical field [0001] The invention relates to the optical structure of an LED liquid crystal projector, especially the optical structure of an LED liquid crystal projector with a single polarization converter. Background technique [0002] Liquid crystal projectors are widely used photoelectric products. At present, common liquid crystal projectors use metal halide tungsten lamps as light sources. Although they have high brightness, they are bulky. This type of liquid crystal projector usually uses a polarization conversion system (PCS) to convert the non-polarized light of the metal halide tungsten lamp into polarized light to improve the utilization rate of light energy. A PCS usually includes a row of cubic prism arrays and a double row of lens arrays. The cubic prism array is bonded together by n cubic prisms, because after unpolarized light passes through the cubic prisms, the diameter of the outgoing beam will increase to (n+1) / n times the diameter of the incident b...

AI Technical Summary

Problems solved by technology

In addition, due to the large light-emitting area of ​​LEDs, it is difficult to borrow mature PCS technology

So far, there has not been a product of a miniature projector applying polarization conversion technology

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