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Projection device and fabrication method of polarization grating

A technology of polarization grating and projection device, which is applied to projection devices, diffraction gratings, polarizing elements, etc., can solve the problems such as the reduction of optical efficiency of liquid crystal on silicon projectors.

Active Publication Date: 2015-09-16
THE HONG KONG UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The optical efficiency of liquid crystal on silicon projectors is significantly reduced when an unpolarized beam of light is polarized and passed through a polarizing beam splitter

Method used

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  • Projection device and fabrication method of polarization grating
  • Projection device and fabrication method of polarization grating
  • Projection device and fabrication method of polarization grating

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Embodiment Construction

[0072] Reference will now be made in detail to embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and description to refer to the same or like parts.

[0073] Figure 1A is a schematic diagram of a projection device according to an embodiment of the present invention; Figure 1B for Figure 1A A schematic cross-sectional view of a reflective spatial polarization modulator in ; and Figure 1C for Figure 1A Schematic top view of the polarization grating in . see Figure 1A to Figure 1C, the projection device 100 in this embodiment includes a light source 110 , a reflective spatial polarization modulator 120 , a polarization grating 130 and a projection lens 140 . The light source 110 is used for providing a light beam 112 . In this embodiment, the light beam 112 is a white light beam, and the light source 110 includes at least one white light-emitting diode (LED...

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Abstract

The invention provides a projection device and a fabrication method of a polarization grating. The projection device includes a light source, a reflective spatial polarization modulator, a polarization grating and a projection lens; the light source is used for providing light beam; the reflective spatial polarization modulator is arranged on the path of the light beam and is used for reflecting the light beams and modulating the polarization state of the light beams; the polarization grating is arranged on the path of the light beam between the light source and the reflective spatial polarization modulator, wherein the reflective spatial polarization modulator reflects the light beam from the polarization grating to the polarization grating; and the projection lens is arranged on the path of the light beam from the reflective spatial polarization modulator, and the polarization grating is arranged on the path of the light beam between the reflective spatial polarization modulator and the projection lens.

Description

technical field [0001] The present invention generally relates to display devices and methods of manufacturing the same, and more particularly to projection devices and methods of manufacturing polarization gratings. Background technique [0002] In the field of display technology, flat panel displays need to be of commensurate size when large display frames are required. However, a projection device having a smaller size can form a large display frame on a screen. Therefore, the projection device is advantageous in situations where many people watch a display frame together (for example, in a meeting, a presentation, or watching a movie). Therefore, the projection device has an irreplaceable position in the field of display technology. [0003] In conventional liquid-crystal-on-silicon (LCOS) projectors, an unpolarized beam of light is polarized and then travels to a liquid-crystal-on-silicon (LCOS) panel. The liquid crystal on silicon panel reflects the polarized light ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/20G03B21/00G02B5/30G02B5/18
CPCG02B5/3083G03B21/142G03B21/2073
Inventor 郭海成谭力李悦荣
Owner THE HONG KONG UNIV OF SCI & TECH
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