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Illumination device, image display device, and projector

A technology for image display devices and lighting devices, applied in projection devices, optics, instruments, etc., can solve the problems of complexity, increase in device cost, and decrease in light utilization efficiency, and achieve the advantages of suppressing increase, suppressing size increase, and suppressing speckle patterns. Effect

Inactive Publication Date: 2007-01-24
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] When a predetermined optical system is used to achieve a uniform illuminance distribution, there is a possibility that the desired image cannot be obtained through the positional relationship between the laser and the optical system
[0007] In addition, due to the structure of the optical system, there is a possibility that the overall size of the device will be increased, complicated, or the cost of the device will be increased.
[0008] In addition, due to the structure of the optical system, there is a possibility of causing a decrease in light utilization efficiency, etc.

Method used

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  • Illumination device, image display device, and projector
  • Illumination device, image display device, and projector
  • Illumination device, image display device, and projector

Examples

Experimental program
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no. 1 Embodiment

[0138] The first embodiment will be described.

[0139] FIG. 1 is a schematic configuration diagram showing an image display device PJ of a first embodiment, figure 2 It is an enlarged view of the main part of Fig. 1.

[0140] In this embodiment, the image display device is described by taking the following projection type image display device (projector) as an example. In this projection type image display device, through the projection system, the image with The colored light of the image information is projected on the screen.

[0141] In FIG. 1 , projector PJ includes a projection unit U that projects light including image information on a screen 100 (second surface).

[0142] From the projection unit U, light is projected onto the screen 100 , whereby an image is formed on the screen 100 .

[0143] In the projector PJ of this embodiment, the screen 100 is a transmissive screen, and light having image information is projected onto the screen 100 from the front side of t...

no. 2 Embodiment

[0259] refer to Figure 7 The second embodiment will be described.

[0260] In the following description, the same reference numerals are used for the components that are the same as or equivalent to those of the above-mentioned embodiments, and the description thereof is simplified or omitted.

[0261] in the above figure 2 In the above embodiment, the surface (light exit surface) of the diffractive optical element 4K and the incident surface 11 of the spatial light modulation device 10 are arranged substantially in parallel, however, the surface of the diffractive optical element 4K may also be arranged to face in different directions. (light exit surface) and the incident surface 11 of the spatial light modulation device 10 .

[0262] By forming it in this way, it is possible to reduce the size of the device.

no. 3 Embodiment

[0264] Refer below Figure 8 , the third embodiment will be described.

[0265] Figure 8 It is a plan view schematically showing the positional relationship between the spatial light modulation device 10 (incident surface 11 ) and the plurality of laser light source devices 2 .

[0266] picture Figure 8 As shown, the incident surface 11 has a substantially rectangular shape (rectangular shape) in plan view, and has a first side H1 parallel to the Y axis and a second side H2 parallel to the X axis.

[0267] In addition, "planar view" refers to the shape and positional relationship when the surface is viewed from a direction perpendicular to the surface (here, the incident surface).

[0268] That is, "planar view" refers to the shape and positional relationship in the two-dimensional direction along a certain surface.

[0269] Thus, for example, "the incident surface 11 is substantially rectangular when viewed from a plane" means that the incident surface 11 is substantial...

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Abstract

The present invention provides an image display device, which includes: a laser light source device emitting laser light; and a diffractive optical element, wherein the laser light emitted from the laser light source device is incident on the diffractive optical element, and the incident laser light is Diffraction light is formed, and the first surface is illuminated by the above-mentioned diffracted light, and the above-mentioned first surface is installed at a position where the zero-order light generated from the above-mentioned diffractive optical element does not enter, and an image is displayed by the light passing through the above-mentioned first surface .

Description

technical field [0001] The present invention relates to a lighting device, an image display device and a projector. Background technique [0002] In the past, projection type image display devices (projectors) have been known. [0003] Projection-type image display devices use a projection system to project colored light with image information formed by a spatial light modulation device such as a liquid crystal device on a screen. [0004] In projection-type image display devices, techniques have been proposed in which laser light is used as a light source, as described in JP-A-11-64789 and JP-A-2000-162548. [0005] In such a projection-type image display device, it is necessary to illuminate the incident surface of the spatial light modulation device with a uniform illuminance distribution by laser light. [0006] When a predetermined optical system is used to achieve a uniform illuminance distribution, there is a possibility that a desired image cannot be obtained due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00G03B21/00
Inventor 山内泰介武田高司
Owner SEIKO EPSON CORP
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