JP3104647U - Projection type image display device - Google Patents

Abstract

In a projection type image display device, the color arrangement timing of light for image projection is accurately detected with a simple configuration.
A projection type image display device includes a lamp for emitting light for image projection, a color arrangement device for coloring light emitted from the lamp, and a light condensed by the color arrangement device. A doublet lens 14, an image forming element 17 that forms an image by reflecting light collected by the doublet lens 14, and a photodetector 18 that receives light reflected by the surface of the doublet lens 14. A part of the light arranged by the color arrangement device 12 is reflected by the surface 14a of the doublet lens 14 and received by the photodetector 18, and the photodetector 18 outputs a signal corresponding to the color of the received light. Based on the output signal of the photodetector 18, the color arrangement timing by the color arrangement device 12 is detected.
[Selection diagram] FIG.

Description

  The present invention relates to a projection-type image display device that projects an image and displays the image on a screen or the like.

  Conventionally, based on image data from a personal computer, a video camera, or the like, a projection-type image display device that forms an image with an image forming element using light emitted from a lamp, and projects and displays the image on a screen or the like. It has been known. This type of projection type image display device includes a color arrangement device that arranges light emitted from a lamp in order to project a color image. In the color arrangement device, a color wheel, on which four color filters of red, green, blue, and white (transparent) are arranged in a circumferential direction, is rotated by a motor to rotate light emitted from a lamp. By transmitting the light through the color wheel, the light emitted from the lamp is changed in color in a time series to red, green, blue, and white (transparent) so as to be colored.

  In such a projection type image display device, each of the image forming elements is adjusted in accordance with a time-series coloration timing of light by the coloration device (that is, a change in light color of red, green, blue, and white (transparent)). A color image is formed by controlling the reflection or transmission of light at a pixel. That is, it is necessary to match the timing of reflecting or transmitting light by each pixel of the image forming element with the timing of coloring light by the color arrangement device.

  For this reason, in the conventional projection type image display device, the light after being colored by the color arrangement device is received by the photodetector, and the color arrangement timing is detected based on the received light output, and the color is arranged by the color arrangement device. A configuration is used in which a part of the light after that is guided to the location where the photodetector is arranged using a light guide plate or the like.

Further, with respect to a reflection type projector that displays a color image using a rotating color filter, an index section representing a rotation phase is provided on the rotating color filter, and the index section is detected by a sensor to drive a display device. A device that generates a pulse is known (for example, see Patent Document 1). Further, with respect to a projector that displays a color image using a color wheel, an inclined surface is provided on a light emission side of a light tunnel that guides light after color arrangement by the color wheel, and the light after color arrangement by the color wheel is provided on the inclined surface. There is known a device in which a part of the light is reflected toward a location where a photodetector is arranged, and the reflected light is received by the photodetector to detect a color arrangement timing by a color wheel (for example, see Patent Document 2). Further, with respect to a display device for displaying a color image using a color wheel, a photodetector is arranged immediately before the image forming element, and the photodetector receives light after coloration by the color wheel, and detects coloration timing by the color wheel. Such a configuration is known (for example, see Patent Document 3).
JP-A-11-239359 U.S. Pat. No. 6,155,687 U.S. Pat. No. 6,084,235

  However, in the above-described conventional projection type image display device, a part of the light after the color arrangement by the color arrangement device is guided to the location where the photodetector is arranged using the light guide plate or the like. The configuration was complicated and the cost was high. Also, if there is a component error in the light guide plate or the like, the light after the color arrangement cannot be guided to the photodetector well, and the color arrangement timing by the color arrangement apparatus may not be detected.

  In the projector described in Patent Literature 1 described above, it is necessary to provide an index portion representing the rotation phase on the rotating color filter, and the index portion needs to be detected by a sensor, which complicates the configuration. . Further, in the projector described in Patent Document 2 described above, an inclined surface is provided on the light emission side of the light tunnel, and light reflected on the inclined surface is received by the photodetector, which complicates the configuration. In addition, if there is an error in the inclined surface, the reflected light cannot be properly received by the photodetector, and the color arrangement timing by the color arrangement device may not be detected. Further, in the display device described in Patent Document 3 described above, it is technically difficult to dispose a photodetector immediately before an image forming element, so that the configuration is complicated.

  The present invention has been made in order to solve the above-described problem, and has as its object to provide a projection-type image display device that can accurately detect the coloration timing of light for image projection with a simple configuration. .

  In order to achieve the above object, the invention of claim 1 is to rotate a lamp for emitting light for image projection and a color wheel provided with a plurality of color filters along a circumferential direction. A color arrangement device for distributing the image projection light by transmitting the image projection light emitted from the lamp, and a light integrator for condensing, uniforming and emitting the image projection light arranged by the color arrangement device A doublet lens for condensing light for image projection emitted from the light integrator, a reflecting mirror for reflecting light for image projection emitted from the light integrator and passing through the doublet lens, and an image reflected by the reflecting mirror A relay lens that condenses the light for projection and the light for image projection sent from the relay lens is reflected by many micromirrors An image forming element for forming an image, a projection lens for projecting the image formed by the image forming element, a color arrangement device, a light integrator, a doublet lens, a reflection mirror, a relay lens, an image forming element, and a projection lens. A projection type image display device having casting and holding, further comprising a photodetector for transmitting light reflected by the doublet lens through the light integrator, wherein the doublet lens has a flat plane of incidence of light from the light integrator. The photodetector is mounted on the casting adjacent to the incident surface of the light from the light integrator in the doublet lens, and based on the output signal from the photodetector, adjusts the coloration timing of the light for image projection by the coloration device. detection It is obtained by so controlling the angle of each micro mirror of the image forming element color scheme timing of the detected.

  In this configuration, the light for image projection arranged by the color arrangement device is emitted from the light integrator, is irradiated on the doublet lens, and is collected by the doublet lens. At this time, a part of the image projection light applied to the doublet lens is reflected by the surface of the doublet lens and received by the photodetector. Therefore, the output signal of the photodetector changes according to the color of the light for image projection, which is arranged by the color arrangement device. Further, since the light incident surface of the doublet lens has a flat planar shape, the light for image projection reflected on the surface of the doublet lens is hardly diffused, whereby more reflected light from the doublet lens can be reflected by the photodetector. And the accuracy of the output signal of the photodetector is increased. Based on the output signal from the photodetector, the color arrangement timing of light for image projection by the color arrangement device is detected.

  According to a second aspect of the present invention, there is provided a lamp for emitting light for image projection, a color arrangement for coloring the light for image projection emitted from the lamp, and a light for image projection arranged by the color arrangement. A projection-type image display device that includes a lens and an image forming element that forms an image using light for image projection sent from the lens, and that projects and displays an image formed by the image forming element; And a photodetector that receives the light reflected by the lens after being colored by the photodetector, and based on an output signal from the photodetector, a coloration timing of light for image projection by the color arrangement device is set.

  In this configuration, the light for image projection, which is arranged by the color arrangement device, is applied to the lens and collected by the lens. At this time, a part of the light for projecting the image irradiated on the lens is reflected on the surface of the lens and received by the photodetector. Therefore, the output signal of the photodetector changes according to the color of the light for image projection, which is arranged by the color arrangement device. Based on the output signal from the photodetector, the color arrangement timing of light for image projection by the color arrangement device is detected.

  According to a third aspect of the present invention, in the projection type image display device according to the second aspect, the lens has a flat plane shape on which the light incident surface from the color arrangement device is incident.

  In this configuration, the light for image projection reflected on the surface of the lens is difficult to diffuse because the light incident surface of the lens has a flat planar shape. Therefore, more reflected light from the lens is received by the photodetector, and the accuracy of the output signal of the photodetector is improved.

  According to the invention of claim 1, by providing a photodetector for receiving the light reflected by the doublet lens, the light for image projection can be formed with a simple configuration without using components other than the photodetector (such as a conventional light guide plate). The color arrangement timing can be detected, and the cost can be reduced. In addition, since components other than the photodetector are not used, the influence of component errors and the like is reduced, and the color arrangement timing can be detected more accurately. Further, since the light incident surface of the doublet lens has a flat planar shape, the intensity of the light received by the photodetector is increased, whereby the color arrangement timing can be detected more accurately.

  According to the invention of claim 2, by providing the photodetector that receives the light reflected by the lens, it is possible to detect the coloration timing of the light for image projection with a simple configuration without using any components other than the photodetector. And cost reduction can be achieved. In addition, since components other than the photodetector are not used, the influence of component errors and the like is reduced, and the color arrangement timing can be detected more accurately.

  According to the third aspect of the present invention, since the light incident surface of the lens has a flat planar shape, the intensity of the light received by the photodetector is increased, whereby the color arrangement timing can be detected more accurately.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, a projection type image display device 1 forms an image using a built-in image forming element based on an image signal input from a personal computer, a video camera, or the like, and projects the image on a screen, a wall surface, or the like. It is a device to do.

  The projection-type image display device 1 includes a projection lens 3 on the front surface of an outer case 2, and projects an image formed by an image forming element from the projection lens 3. Further, the projection type image display device 1 includes an image projection optical system for forming an image and projecting the image from the projection lens 3 inside the outer case 2.

  Next, the image projection optical system will be described with reference to FIGS. The image projection optical system 10 includes, in addition to the projection lens 3 described above, a lamp 11, a color arrangement device 12, a light integrator 13, a doublet lens 14, a reflection mirror 15, a relay lens 16, an image forming element 17, A photodetector 18 is provided. The projection lens 3, the color arrangement device 12, the light integrator 13, the doublet lens 14, the reflection mirror 15, the relay lens 16, the image forming element 17, and the photo detector 18 are held by a casting 19 (see FIG. 3). The lamp 11 is detachably held by a lamp holding member (not shown) so as to be replaceable.

  The lamp 11 emits light for image projection, has a lamp bulb 21 and a lamp reflector 22, and reflects and condenses the light for image projection radiated from the lamp bulb 21 by the lamp reflector 22. The light is emitted. The lamp 11 that emits white light is used.

  The color arrangement device 12 arranges colors of image projection light emitted from the lamps 11 and includes a color wheel 31 and a motor 32, and the color wheel 31 is driven to rotate by the motor 32. . The color hole 31 has a configuration in which four color filters 31r, 31g, 31b, and 31w of four colors of red, green, blue, and white (transparent) are arranged along a circumferential direction (a rotation direction of the color wheel 31). I have. The light for image projection emitted from the lamp 11 is transmitted through the rotating color wheel 31 to be arranged in time series in four colors of red, green, blue and white (transparent).

  The light integrator 13 condenses, homogenizes, and emits the light for image projection arranged by the color arrangement device 12, and opens four glass plates at both ends (a light entrance side opening and a light exit side opening). It is comprised by joining to the cylindrical shape which has. The light integrator 13 is arranged such that the light incident side opening is adjacent to the color wheel 31 of the color arrangement device 12. The light for image projection arranged by the color arrangement device 12 enters the light entrance side opening of the light integrator 13 and is condensed and homogenized by repeating reflection inside the light integrator 13, and is emitted while spreading from the light exit side opening. .

  The doublet lens 14 condenses the light for image projection emitted from the light integrator 13 while being spread, and includes two lenses. The doublet lens 14 is arranged adjacent to the light exit side opening of the light integrator 13, and the light incident surface 14 a of the light from the light integrator 13 is formed in a flat planar shape.

  The reflection mirror 15 reflects light for image projection emitted from the light integrator 13 and passing through the doublet lens 14. The relay lens 16 condenses the light for image projection reflected by the reflection mirror 15.

  The image forming element 17 forms an image by reflecting light for image projection sent from the relay lens 16. The image forming device 17 has an image forming surface in which a large number of micromirrors are arranged in a matrix, and the angle of each micromirror is controlled by a signal from a control unit (not shown), so that an image is formed. An image is formed by reflecting light applied to the formation surface (each micromirror). The projection lens 3 is for projecting an image formed by the image forming element 17 and includes a plurality of lenses.

  The photodetector 18 detects the color arrangement timing of the image projection light by the color arrangement device 12, and transmits through the light integrator 13 to the surface of the doublet lens 14 (that is, the light incident surface of the doublet lens 14 from the light integrator 13). The light reflected at 14a) is received, and a signal corresponding to the received light intensity is output. The photodetector 18 is held by a casting 19 adjacent to the surface 14a of the doublet lens 14. The photodetector 18 is attached to a mounting member (not shown) together with the circuit board 41 and the connector 42, and is held by the casting 19 by screwing the mounting member to the casting 19.

  According to the image projection optical system 10 having such a configuration, the image projection light emitted from the lamp 11 is colored by the color arrangement device 12, condensed and homogenized by the light integrator 13, emitted, and then doublet. The light is irradiated on the lens 14. The light for image projection is condensed by the doublet lens 14, reflected by the reflection mirror 15, condensed by the relay lens 16, and irradiated to the image forming element 17. Then, an image is formed by reflecting light for image projection by the image forming element 17, and the reflected light from the image forming element 17, that is, the image formed by the image forming element 17 is transmitted through the projection lens 3. It is projected on a screen or the like.

  At this time, part of the image projection light emitted from the light integrator 13 and applied to the doublet lens 14 is reflected by the surface 14 a of the doublet lens 14 and received by the photodetector 18. Since the light for image projection emitted from the light integrator 13 is emitted while spreading as described above, a part of the light is reflected while expanding on the surface 14 a of the doublet lens 14. Thus, the light reflected on the surface 14a of the doublet lens 14 can be received by the photodetector 18. Since the surface 14a of the doublet lens 14 has a flat planar shape as described above, the light for image projection reflected on the surface 14a of the doublet lens 14 is hardly diffused, and more light is emitted by the photodetector 18. Is received by the In addition, since the photodetector 18 is disposed adjacent to the surface 14a of the doublet lens 14 as described above, while the diffusion of the light for image projection reflected on the surface 14a of the doublet lens 14 is small, more Is received by the photodetector 18.

  The light for image projection reflected on the surface 14a of the doublet lens 14 is light after being colored by the color arrangement device 12, and the light intensity varies depending on the color. Therefore, the output signal of the photodetector 18 changes according to the color of the light for image projection arranged by the color arrangement device 12. The output signal of the photo detector 18 is sent to the control unit. Then, the control unit detects the color arrangement timing of the light for image projection by the color arrangement device 12 based on the output signal from the photodetector 18, and detects the detected color arrangement timing and the image signal input from a personal computer, a video camera, or the like. Based on this, the angle of each micro mirror of the image forming element 17 is controlled. Thus, the image forming element 17 forms a color image based on an image signal input from a personal computer, a video camera, or the like.

  According to the projection type image display apparatus 1 having the above-described configuration, since the light reflected by the doublet lens 14 is received by the photodetector 18, the image can be displayed with a simple configuration without using components other than the photodetector 18, such as a light guide plate. The color arrangement timing of the projection light can be detected. Moreover, since components such as the light guide plate other than the photodetector 18 are not used, the influence of component errors and the like is reduced, and the color arrangement timing can be detected more accurately. Further, since the light incident surface 14a of the doublet lens 14 has a flat planar shape, the light receiving intensity of the photodetector 18 is enhanced. Further, the photodetector 18 is also adjacent to the surface 14a of the doublet lens 14 because Of the received light is increased. As a result, the color arrangement timing of the light for image projection by the color arrangement device 12 can be detected more accurately.

  Note that the present invention is not limited to the configuration of the above embodiment, and various modifications are possible. For example, in the above embodiment, the image projection optical system 10 may not include the light integrator 13 and the reflection mirror 15. Further, the image projection optical system 10 is not limited to the configuration in which the light reflected by the doublet lens 14 is received by the photodetector 18, and the light reflected by the lens provided in the optical path from the color arrangement device 12 to the image forming element 17. Any configuration may be used as long as the photodetector 18 receives light.

  The color arrangement device 12 is not limited to the one using the color wheel 31, but may have any configuration as long as the color for image projection light is arranged in time series. Further, the image forming element 17 is not limited to an element that forms an image by reflecting light, but may be an element that forms an image by transmitting light such as liquid crystal. Further, the projection type image display device 1 is not limited to a device that projects and displays an image on a screen or the like provided separately from the device 1, and projects and displays the image on a display panel provided in the device 1. Is also good.

FIG. 1 is a perspective view showing a schematic configuration of a projection type image display device according to an embodiment of the present invention. FIG. 2 is a perspective view showing an image projection optical system of the projection type image display device. FIG. 3 is a perspective view showing a holding structure of the image projection optical system.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Projection type image display device 2 Exterior case 3 Projection lens 10 Image projection optical system 11 Lamp 12 Color arrangement device 13 Light integrator 14 Doublet lens 14a Incident surface 15 Reflection mirror 16 Relay lens 17 Image forming element 18 Photodetector 19 Casting 21 Lamp valve 22 Lamp Reflector 31 Color wheel 31r, 31g, 31b, 31w Color filter

Claims (3)

A lamp that emits light for image projection and a color wheel provided with a plurality of color filters along the circumferential direction are rotationally driven, and the light for image projection emitted from the lamp is transmitted to the color wheel. A color integrator that colors the light for image projection, a light integrator that condenses, uniformizes, and emits the light for image projection colored by the color scheme, and an image projection that is emitted from the light integrator. A doublet lens for collecting light for image projection, a reflection mirror for emitting light for image projection emitted from the light integrator and passing through the doublet lens, and a light for image projection reflected by the reflection mirror. Relay lens, and the image projection light transmitted from the relay lens is reflected by a number of micromirrors to form an image. Holds an image forming element to be formed, a projection lens for projecting an image formed by the image forming element, and the color arrangement, a light integrator, a doublet lens, a reflection mirror, a relay lens, an image forming element, and a projection lens. And a projection type image display device provided with
A photodetector that receives the light transmitted through the light integrator and reflected by the doublet lens,
The doublet lens has a flat plane shape where the light incident surface of the light integrator is flat,
The photodetector is attached to the casting adjacent to an incident surface of the light from the light integrator in the doublet lens,
Based on an output signal from the photodetector, a color arrangement timing of light for image projection by the color arrangement device is detected, and the angle of each micromirror of the image forming element is controlled at the detected color arrangement timing. A projection type image display device. A lamp for emitting light for image projection, a color arrangement device for coloring the light for image projection emitted from the lamp, a lens for condensing light for image projection arranged by the color arrangement device, and the lens An image forming element for forming an image using light for image projection sent from
Further provided is a photodetector that receives light reflected by the lens after being colored by the color arrangement device,
A projection-type image display device, wherein coloration timing of light for image projection by the color arrangement device is set based on an output signal from the photodetector.   The projection type image display device according to claim 2, wherein the lens has a flat plane surface on which light from the color arrangement device is incident.

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