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Light engine system for reflective liquid crystal projection display

A liquid crystal projection and reflective technology, applied in the field of light engine systems, can solve the problems of not being able to improve the efficiency of the whole machine, and achieve the effects of increasing system complexity, improving optical efficiency and overall brightness, and maximizing light utilization

Active Publication Date: 2013-05-01
SHENZHEN EVIEWTEK TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the fact that none of the existing micro-projection light engines can fundamentally improve the efficiency of the whole machine to increase the brightness output, a light engine structure that can effectively control and utilize two polarization states is very necessary for projection display

Method used

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  • Light engine system for reflective liquid crystal projection display
  • Light engine system for reflective liquid crystal projection display
  • Light engine system for reflective liquid crystal projection display

Examples

Experimental program
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Effect test

Embodiment 1

[0035] figure 1 The first embodiment of the present invention for a reflective liquid crystal projection display system 1 is given, including a light source module 2 , a polarized light management module 3 , an image information module 4 and a projection lens 5 .

[0036] 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 .

[0037] The natural light of the 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 small-an...

Embodiment 2

[0050] image 3 A second example of the present invention is given. Compared with the first example, in the polarization color combining unit of the second example, the parallelogram prism 39 is used to glue two first right-angle prisms 40, instead of the dichroic prism 31 and the first PBS, the parallelogram prism A first right-angle prism 40 is glued after being plated with a dichroic film on one color combining surface of the parallelogram prism 39, and a first right-angle prism 40 is glued after being coated with a polarizing beam splitting film on the other color combining surface of the parallelogram prism 39. The advantage is that the interface between the dichroic prism 31 and the first PBS 32 is reduced, which is more conducive to the integration of the optical system.

Embodiment 3

[0052] Figure 4 A third example of the present invention is given. This instance is different from figure 1 The example is that in the polarization color combination unit, the red quarter wave plate 321 and the blue light quarter wave plate 323 are replaced by a wide band quarter wave plate 324, and glued to the dichroic prism 31 and the first PBS, reducing the number of quarter wave plates. exist figure 1 In the example, the design wavelength of each quarter-wave plate adopts the central wavelength of the corresponding light source. Because the spectrum of each primary color itself is very narrow, the common quarter-wave plate can achieve high polarization conversion for monochromatic light, such as Figure 11 (a). In this example, if a traditional quarter-wave plate is used, since the central wavelengths of red light and blue light are far apart, the polarization conversion efficiency of light beyond the design wavelength will decrease rapidly as the wavelength deviate...

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Abstract

The invention provides a light engine system for reflective liquid crystal projection display. The light engine is composed of a light source module, a light management module, an image signal module and a projection lens. Two polarization states of three primary colors can be effectively utilized to substantially improve the optical efficiency and output brightness of the entire machine without increasing the system complexity and the costs. The light source module is composed of a three-primary-color solid light source and a light homogenizing device and provides color-saturated three-primary-color lighting for the projection. The light management module comprises a dichroic color splitting prism which is used for integrating two primary lights from different directions; the image signal module is a monolithic reflective liquid crystal optical modulation device and is used for modulating the polarized light with three primary colors into a light beam carrying signals in a time sequence mode according to image signals corresponding to each primary color; and the projection lens projects the light carrying the image signals onto a screen through a second PBS (polarizing beam splitter).

Description

technical field [0001] The invention relates to a projection display system, in particular to a light engine system for reflective liquid crystal projection display. 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-projectors infinitely broad. [0003] Micro projectors h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B21/20G02B27/28G02B27/18F21V13/00F21Y101/02F21Y115/10G02F1/13357
Inventor 贺银波陆巍
Owner SHENZHEN EVIEWTEK TECH CO LTD
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