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Light source device and projector

A technology of a light source device and a light source unit, which is applied in projection devices, instruments, optics, etc., and can solve problems such as the miniaturization of light source devices, the difficulty in manufacturing polarization separation layers and reflection layer polarization conversion elements, and the difficulty in miniaturization of projectors, etc.

Active Publication Date: 2022-03-18
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in response to recent demands for miniaturization, in the case of miniaturizing the above-mentioned projection type color image display device, it is difficult to manufacture a polarization conversion element with a narrow distance between the polarization separation layer and the reflection layer.
Therefore, it is difficult to miniaturize a light source device having such a polarization conversion element, and furthermore it is difficult to miniaturize a projector having a light source device.

Method used

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  • Light source device and projector
  • Light source device and projector
  • Light source device and projector

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Experimental program
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no. 1 Embodiment approach

[0021] Below, use Figure 1 to Figure 9 The first embodiment of the present invention will be described. figure 1 It is a schematic configuration diagram of the projector 1 of the present embodiment. In addition, in each of the following drawings, in order to make each constituent element easy to see, it may be shown with a different dimension scale depending on the constituent element.

[0022] The projector 1 of the present embodiment modulates light emitted from the light source device 2 to form an image corresponding to image information, and enlarges and projects the formed image onto a projection surface such as a screen. In other words, the projector 1 forms an image by modulating the light emitted from the light source device 2 by one light modulation device 6 including one liquid crystal panel 61 , and projects the formed image. The projector 1 is a so-called single-panel type projector.

[0023] Such as figure 1 As shown, the projector 1 has a light source device...

no. 2 Embodiment approach

[0175] Below, use Figure 10 as well as Figure 11 A second embodiment of the present invention will be described.

[0176] The basic structure of the light source device of the second embodiment is the same as that of the first embodiment, and the structure of the reflection element is different from that of the first embodiment. Therefore, an overall description of the light source device will be omitted.

[0177] Figure 10 It is a side view of the light source device of the second embodiment seen from the −X direction. Figure 11 It is a schematic diagram showing the incident position of each color light on the multi-lens. In addition, in Figure 10 In , the illustration of the rotational phase difference device 213 , the first phase difference element 24 , the first light concentrating element 25 , and the diffusion device 26 is omitted.

[0178] exist Figure 10 and Figure 11 In the drawing, the same reference numerals are assigned to the same components as thos...

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Abstract

The light source device and the projector emit various kinds of colored light with the same polarization direction. The light source device includes: a light source unit; a first optical layer that transmits the first light in the first polarization direction from the light source unit and reflects the first light in the second polarization direction; a second optical layer that transmits the first light in the first polarization direction from the first optical layer; a third optical layer that transmits the first light in the first polarization direction from the second optical layer; a fourth optical layer that reflects the first light in the first polarization direction from the third optical layer; a diffusion element; the third optical layer transmits the second light in the first polarization direction among the second light from the wavelength conversion element and reflects the second light in the second polarization direction, the fourth optical layer transmits the second light in the first polarization direction from the wavelength conversion element, and the second optical layer reflects the second light in the second polarization direction from the third optical layer. The first optical layer transmits the first light from the diffusion element, and the second optical layer transmits the first light from the first optical layer.

Description

technical field [0001] The present invention relates to a light source device and a projector. Background technique [0002] There is known a projector that modulates light emitted from a light source to generate image light based on image information, and projects the generated image light. Patent Document 1 below discloses a projection-type color image display device including a light source, a plurality of dichroic mirrors, a liquid crystal display element having a microlens array, and a projection lens. The projection-type color image display device separates the white light emitted from the light source into multiple color lights of different colors, and makes the separated multiple color lights incident on different sub-pixels in a liquid crystal display element to perform color display. show. In the projection type color image display device described above, the red reflective dichroic mirror, the green reflective dichroic mirror, and the blue reflective dichroic mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/20
CPCG03B21/2073G03B21/204G03B21/206H04N9/3161H04N9/3164H04N9/3167H04N9/3158G03B21/2066G03B21/2033G02F1/133526G02B5/0236G02B27/283G02B27/30G03B21/2013G02B5/3083G02F1/13362G03B33/12G03B21/208
Inventor 秋山光一
Owner SEIKO EPSON CORP