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Portable liquid crystal projection light engine employing back reflection prism array

A liquid crystal projection and prism array technology, which is applied in the field of projection display systems, can solve the problems of large volume and restrict the portability of the system, and achieve the effects of reduced volume, optimal utilization of light energy, and miniaturization.

Active Publication Date: 2012-07-11
杭州研明光电技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In addition, the structure uses three independent LED light sources for lighting, and the volume of the entire structure is too large, which restricts the portability of the entire system

Method used

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  • Portable liquid crystal projection light engine employing back reflection prism array
  • Portable liquid crystal projection light engine employing back reflection prism array
  • Portable liquid crystal projection light engine employing back reflection prism array

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] figure 1 The structure of the first embodiment of the present invention is given, including a light source module 2 , a polarized light management module 3 , an image information module 4 and a projection lens 5 .

[0037] The light source module 2 includes a red light LED 21, a green light LED 22, a blue light LED 23, a red light uniform device 211, a green light uniform device 221 and a blue light uniform device 231, and the red LED 21 is connected to the red light uniform device 211 , the green LED 22 is connected to the green uniform light device 221 , and the blue LED 23 is connected to the blue light uniform device 231 .

[0038] The natural light of three primary colors emitted by the red LED 21, the green LED 22, and the blue LED 23 passes through the red light homogenizing device 211, the green light homogenizing device 221 and the blue light homogenizing device 231 respectively, and then collects them into rectangular light beams required for lighting: red lig...

Embodiment 2

[0047] Figure 5 The structure of the second embodiment of the present invention is shown. The red LED 21 and the blue LED 23 are packaged together, and share the same light homogenizing device 234 . After each primary color exits the first PBS 32 , after passing through the condenser lens 34 and the polarization interference filter 35 , the primary colors with different polarization states are integrated into the same polarization state. The second PBS 36 reflects each primary color light to the image signal module 4 , and the modulated light passes through the second PBS and is projected from the projection lens 5 . compared to figure 1 , Figure 5 The structure is more compact, and the volume of the whole system can be reduced by about 30%. Not only the green LED 22 and its homogenizing device 221 can be closer to the first PBS 32, but also the dichroic prism 31 and a quarter wave plate are less 323, which is more conducive to the miniaturization of the projection syste...

Embodiment 3

[0057] Figure 14 The structure of the third embodiment of the present invention is given, including a light source module 2, a polarized light management module 3, an image information module 4 and a projection lens 5, etc., wherein the light management module 3 consists of a polarization color combining unit, a condenser lens 34 , polarization interference filter 35, and the second PBS 36 are arranged coaxially in turn to form, the image information module 4 is located at a right-angled side of the second PBS 36, and the projection lens 5 is located at the outgoing side of the second PBS 36; the light source module 2 includes Red light LED 21, green light LED 22, blue light LED 23, green light homogenizing device 221 and red and blue light homogenizing device 234, green light LED 22 and green light homogenizing device 221 are connected, red light LED 21 and blue light LED 23 uniform Connected to the red and blue uniform light device 234; the polarization color combining unit...

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Abstract

The invention relates to a portable liquid crystal projection light engine employing a back reflection prism array. The light engine consists of a light source module, a light management module, an image signal module and a projection lens module, and two polarization states of light with three primary colors can be effectively utilized so as to greatly improve the optical efficiency of the whole machine. Two primary color light sources can be packaged together through the light source module, the volume of the light engine is reduced by 30 percent, the whole machine has a compact and light structure; the traditional plane mirror is replaced by a high-efficiency back reflection micro-prism array in the light management module, incident light rays at all angles can return to the light source along the original paths, are polarized and rotated, and enter a subsequent illumination system, non-normal incident light rays are collected to the greatest degree, and the output brightness of the whole machine is improved on the basis of not increasing the complexity and cost of the system.

Description

technical field [0001] The invention relates to a projection display system, in particular to a portable liquid crystal projection light engine which adopts a retroreflective prism array and can greatly improve brightness. Background technique [0002] Projection display has become the mainstream method of large-screen high-definition dynamic display, and is widely used in important links such as business, education, scientific research, entertainment and family. In recent years, with the rapid development of many technologies such as microelectronics, optics, and processing technology, as well as the popularization of modern business mobile office models and the increase of handheld digital products, miniaturization has become a new direction for the development of projection display technology. Micro-projectors have significant advantages such as lightness and ease of use, and can be combined with various consumer electronics products, which makes the application of micro-...

Claims

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Application Information

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IPC IPC(8): G03B21/20G02B27/28G02B27/18G02B27/09F21V13/00F21Y101/02F21Y105/10F21Y115/10G02F1/13357
Inventor 贺银波陆巍
Owner 杭州研明光电技术有限公司
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