JP2014224907A - Projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector that can accurately perform zoom adjustment and image distortion correction.SOLUTION: A projector 1 of the present invention includes a light source device 10 including a first solid light source 11 that emits first light L1 in a visible range and a second solid light source 18 that emits second light L2 in an invisible range, and a superposition optical system 30 that superposes the first light L1 on the second light L2 in an illumination target area 50a.

Description

  The present invention relates to a projector.

  In a projector, in order to adjust the zoom and correct image distortion (trapezoidal distortion and pincushion distortion), a test pattern is projected onto the screen, and this is imaged by an imaging device, and the relative position between the screen and the projection optical system (Such as the screen position and tilt angle with respect to the projection optical system) may be measured. For example, in Patent Document 1, four dot patterns are formed using four light sources arranged in a line, and the distance between the dots is measured to determine the inclination angle between the screen and the projection optical system. A method of measuring is disclosed.

JP 2005-150919 A

  In the projector of Patent Document 1, a projection optical system for actual images and a projection optical system for test patterns are prepared separately. Therefore, the number of parts increases, leading to an increase in cost. In addition, since each projection optical system is arranged at a spatially different position, it is optimal for the control value (zoom ratio and image distortion correction value) calculated using the test pattern projection optical system and the actual image. Deviation occurs between the control values. Therefore, there is a problem that zoom adjustment and image distortion correction cannot be performed with high accuracy.

  An object of the present invention is to provide a projector capable of accurately performing zoom adjustment and image distortion correction.

  A projector according to an aspect of the invention includes a light source device including a first solid-state light source that emits first light in a visible range and a second solid-state light source that emits second light in a non-visible range; And a superimposing optical system that superimposes the first light on the second light in the region.

  According to this configuration, the first light for the actual image and the second light for the test pattern are superimposed on the illuminated area using the superimposing optical system. The superimposed first light and second light are projected onto the same area of the screen via a common projection optical system. Since the projection optical system for actual images and the projection optical system for test patterns are made common, the number of parts can be reduced and the cost can be reduced. In addition, since the projection optical system for the actual image and the projection optical system for the test pattern are spatially arranged at the same position, control values (zoom ratio and image) calculated using the test pattern projection optical system are used. There is little possibility of deviation between the distortion correction value and the optimal control value in the actual image. Thus, zoom adjustment and image distortion correction can be performed with high accuracy.

  In addition, since the second solid-state light source emits the second light in the non-visible region, zoom adjustment and image distortion correction are performed using the second light while displaying the actual image with the first light. Can do. Since the zoom adjustment and the image distortion correction can be performed without stopping the display of the actual image, the usability of the projector is improved.

  The superimposing optical system may include a diffraction element that diffracts the first light and the second light.

  According to this configuration, for example, by using a diffraction element including a hologram such as CGH (Computer Generated Hologram), the first light and the second light can be accurately superimposed on the illuminated region.

  The first solid light source and the second solid light source may be arranged side by side on the same base.

  According to this configuration, the number of parts is reduced and space saving is achieved.

  The light source device includes a plurality of the first solid light sources having different light emission main wavelengths, and the plurality of first solid light sources having different light emission main wavelengths are arranged on separate bases, respectively. The second solid-state light source emits infrared light as the second light, and the first solid-state light source having the longest emission main wavelength and the second solid-state light source among the plurality of first solid-state light sources. May be arranged side by side on the same base.

  According to this configuration, the emission main wavelengths of the first solid light source and the second solid light source arranged on the same base are relatively close to each other. When the first light and the second light are diffracted by the diffraction element, it is difficult to diffract these lights in the same direction if the wavelengths of the respective lights are greatly different. By making the wavelengths of the first light and the second light close as in the present invention, it becomes easy to superimpose these lights on the same illuminated region.

  The light source device includes a plurality of the first solid light sources having different light emission main wavelengths, and the plurality of first solid light sources having different light emission main wavelengths are arranged on separate bases, respectively. The second solid-state light source emits ultraviolet light as the second light, and the first solid-state light source and the second solid-state light source having the shortest emission main wavelength among the plurality of first solid-state light sources. May be arranged side by side on the same base.

  According to this configuration, the emission main wavelengths of the first solid light source and the second solid light source arranged on the same base are relatively close to each other. When the first light and the second light are diffracted by the diffraction element, it is difficult to diffract these lights in the same direction if the wavelengths of the respective lights are greatly different. By making the wavelengths of the first light and the second light close as in the present invention, it becomes easy to superimpose these lights on the same illuminated region.

  An imaging device that images a test pattern formed on the screen by the second light; and a control device that analyzes a test pattern image captured by the imaging device and performs zoom adjustment or image distortion correction , May be provided.

  According to this configuration, zoom adjustment and image distortion correction can be accurately performed by image processing.

It is a schematic diagram of the projector of 1st Embodiment. It is a front view of the light source device provided in a projector. It is a figure which shows the projection area | region on the screen of a 1st solid light source and a 2nd solid light source. It is a schematic diagram which shows the principal part structure of the projector of 2nd Embodiment. It is a schematic diagram which shows the principal part structure of the projector of 3rd Embodiment.

[First Embodiment]
The projector 1 according to the first embodiment of the present invention will be described below with reference to FIGS. In all of the following drawings, the dimensions and ratios of the constituent elements are appropriately changed in order to make the drawings easy to see.

  FIG. 1 is a schematic diagram of a projector 1 according to this embodiment. FIG. 2 is a front view of the light source device 10 provided in the projector 1. FIG. 3 is a diagram showing a projection area of the first solid light source 11 and a projection area of the second solid light source 18 on the screen SCR.

  As shown in FIG. 1, the projector 1 includes an illumination device 40, a light modulation device 50, a projection optical system 60, an imaging device 70, and a control device 80.

  The illumination device 40 includes the light source device 10, the condensing optical system 20, and the superimposing optical system 30.

  The light source device 10 includes a first solid light source 11, a second solid light source 18, and a collimator lens 12. The first solid light source 11 is a solid light source for real images that emits the first light L1 in the visible range. The second solid light source 18 is a test pattern solid light source that emits the second light L2 in a non-visible region. An actual image refers to an image displayed on the screen SCR for the user to visually recognize. The test pattern refers to an image displayed on the screen SCR for zoom adjustment and image distortion correction (keystone correction or the like).

  As shown in FIG. 2, the light source device 10 has a configuration in which a first solid light source 11 and a second solid light source 18 are arranged side by side on the same base 19. In the case of the present embodiment, the first solid light source 11 and the second solid light source 18 are combined to be arranged in the vertical direction with four pieces in the vertical direction and with six pieces in the horizontal direction. It is not limited to. In the present embodiment, there are 23 first solid light sources 11 and one second solid light source 18, but the number of the first solid light sources 11 and the second solid light sources 18 is the same. It is not limited. The base 19 is a board provided with a mounting area for the first solid light source 11 and the second solid light source 18 and a wiring area for supplying a drive signal to the first solid light source 11 and the second solid light source 18. It is.

  Returning to FIG. 1, one collimating lens 12 is provided for each of the first solid light source 11 and the second solid light source 18. The light emitted from the first solid light source 11 and the second solid light source 18 is collimated by the collimator lens 12 and enters the condensing optical system 20.

  As the first solid-state light source 11, for example, a light source having a wavelength at which the emission intensity is maximum in the visible range (a wavelength range of 380 nm to 750 nm) is used. Specifically, red light (for example, light having a peak of emission intensity at a wavelength of about 600 nm), green light (for example, light having a peak of emission intensity at a wavelength of about 540 nm), blue light (for example, having a wavelength of about 540 nm). A light emitting diode (LED) or a semiconductor laser (Laser Diode; LD) that emits light having a peak of emission intensity at about 450 nm or white light is used as the first solid-state light source 11.

  The first light L <b> 1 emitted from the first solid light source 11 enters the light modulation device 50 through the condensing optical system 20 and the superimposing optical system 30. The first light L1 incident on the light modulation device 50 is modulated based on the image signal for the actual image, and becomes the image light for the actual image. The image light for the actual image is projected on the screen SCR via the projection optical system 60 and displayed as an actual image.

  As the second solid-state light source 18, for example, a light source having a wavelength at which the emission intensity is maximum in a non-visible region (a wavelength region shorter than 380 nm or a wavelength region longer than 750 nm) is used. Specifically, a light emitting diode that emits infrared light having a peak of emission intensity in the infrared region (for example, wavelength of about 800 nm) or ultraviolet light having a peak of emission intensity in the ultraviolet region (for example, wavelength of about 300 nm). Alternatively, a semiconductor laser is used as the second solid light source 18.

  The second light L <b> 2 emitted from the second solid light source 18 enters the light modulation device 50 via the condensing optical system 20 and the superimposing optical system 30. The second light L2 incident on the light modulation device 50 is modulated based on the test pattern image signal, and becomes test pattern image light. The image light for the test pattern is projected on the screen SCR via the projection optical system 60 and displayed as a test pattern.

  The condensing optical system 20 includes a condensing lens 13 and a collimating lens 14. The first light L <b> 1 and the second light L <b> 2 emitted from the light source device 10 are once narrowed by the condenser lens 13, made substantially parallel by the collimator lens 14, and enter the superimposing optical system 30.

  The superimposing optical system 30 includes a diffraction element 15, a superimposing lens 16, and a field lens 17. The superimposing optical system 30 superimposes the first light L1 and the second light L2 in the illuminated region (image forming region) 50a of the light modulation device 50. In FIG. 1, reference symbol Ax indicates an optical axis parallel to the principal ray of the first-order diffracted light of the diffraction element 15.

  The diffraction element 15 diffracts the first light L1 and the second light L2 toward the illuminated region 50a. The diffraction element 15 includes a plurality of cells (not shown) corresponding to the plurality of solid light sources (the first solid light source 11 and the second solid light source 18) provided in the light source device 10. Each cell is provided with a computer generated hologram (CGH) designed to form a predetermined irradiation pattern on the illuminated region 50a.

  The plurality of first lights L1 emitted from the light source device 10 are superimposed on each other in the illuminated area 50a via the diffraction element 15, the superimposing lens 16, and the field lens 17, and have a uniform intensity distribution in the illuminated area 50a. A first irradiation pattern is formed. The second light L2 emitted from the light source device 10 forms a second irradiation pattern having a uniform intensity distribution in the illuminated region 50a via the diffraction element 15, the superimposing lens 16, and the field lens 17.

  Each of the first irradiation pattern and the second irradiation pattern illuminates the entire illuminated area 50a. The irradiation areas of the first irradiation pattern and the second irradiation pattern are arranged so as to overlap each other exactly on the illuminated area 50a. Therefore, as shown in FIG. 3, the first projection area 41 in which the first irradiation pattern is projected on the screen SCR and the second projection area 42 in which the second irradiation pattern is projected on the screen SCR are provided on the screen. It matches on the SCR.

  The first projection area 41 and the second projection area 42 are projection areas when all the pixels of the light modulation device 50 are in a transmissive state (a state where no modulation is performed). In FIG. 3, in order to make the drawing easy to see, the first projection area 41 and the second projection area 42 are slightly shifted from each other, but the actual projection areas completely coincide with each other.

  Returning to FIG. 1, the light modulation device 50 modulates the first light L <b> 1 emitted from the illumination device 40 based on the image signal for the actual image to form the image light for the actual image. The light modulation device 50 modulates the second light L2 emitted from the illumination device 40 based on the test pattern image signal to form test pattern image light.

  The light modulation device 50 may be any device that modulates incident light according to image information. The light modulation device 50 is provided with an image forming area composed of a plurality of pixels. The image forming area becomes the illuminated area 50a. As the light modulation device 50, a transmission type or reflection type liquid crystal light modulation device using a liquid crystal panel, a micro mirror type light modulation device using a micro mirror, or the like can be used. For example, a DMD (Digital Micromirror Device) (trademark of TI) can be used as the micromirror type light modulation device.

  The projection optical system 60 has a zoom function. It is preferable that the projection optical system 60 can adjust the focus position according to the zoom ratio.

  The imaging device 70 images a test pattern formed on the screen SCR. The imaging device 70 may be any device that can capture the entire effective display area (area in which an image can be displayed) of the screen SCR. As the imaging device 70, for example, a CCD camera can be used. The imaging device 70 may be fixed to the main body (housing) of the projector 1 or may be provided separately from the main body of the projector 1.

  The control device 80 performs overall control of each part of the projector 1. The control device 80 includes computing means such as a CPU (Central Processing Unit), storage means such as RAM (Random Access Memory) and ROM (Read Only Memory), and the lighting device 40 and the light modulation device 50 based on the computation results of the computing means. And a driving element for driving the projection optical system 60, and an internal bus for interconnecting them.

  The control device 80 acquires an image captured by the imaging device 70. The control device 80 analyzes the test pattern image captured by the imaging device 70 and performs zoom adjustment or image distortion correction. For example, when adjusting the zoom, the position of the lens included in the projection optical system 60 is adjusted based on a control value (zoom ratio) calculated based on the test pattern. When correcting image distortion, the image signal supplied to the light modulation device 50 is corrected based on a control value (image distortion correction value) calculated based on the test pattern.

  As a method for adjusting the zoom and correcting the image distortion, a known method described in JP 2010-183219 A can be employed. Since the process for calculating the zoom ratio and the correction value of the image distortion is a general process, a detailed description thereof will be omitted.

  The control device 80 independently controls driving of the first solid-state light source 11 for actual images and the second solid-state light source 18 for test patterns. The control device 80 adjusts the zoom using the second solid-state light source 18 and the imaging device 70 during a preliminary period (such as a projector startup period after power-on) before displaying the actual image or during the display of the actual image. And image distortion correction. Since the second solid light source 18 emits light in a non-visible region, the test pattern formed by the second solid light source 18 does not deteriorate the display quality of the actual image. Therefore, zoom adjustment and image distortion correction can be performed using the test pattern during the display period of the actual image.

  According to the projector 1 of the present embodiment described above, the following effects can be obtained.

(1) The projector 1 of the present embodiment includes a first solid-state light source 11 that emits the first light L1 in the visible range, a second solid-state light source 18 that emits the second light L2 in the non-visible range, And a superimposing optical system 30 that superimposes the first light L1 and the second light L2 in the illuminated region 50a.

  In this configuration, the first light L1 for actual images and the second light L2 for test patterns are superimposed on the illuminated area 50a using the superimposing optical system 30. The superimposed first light L1 and second light L2 are projected onto the same area of the screen SCR via the common projection optical system 60. Since the projection optical system for actual images and the projection optical system for test patterns are made common, the number of parts can be reduced and the cost can be reduced. In addition, since the projection optical system for the actual image and the projection optical system for the test pattern are spatially arranged at the same position, control values (zoom ratio and image) calculated using the test pattern projection optical system are used. There is little possibility of deviation between the distortion correction value and the optimal control value in the actual image. Thus, zoom adjustment and image distortion correction can be performed with high accuracy.

  In addition, since the second solid-state light source 18 emits the second light L2 in the non-visible region, zoom adjustment and image distortion are performed using the second light L2 while displaying an actual image with the first light L1. Correction can be performed. Since the zoom adjustment and the image distortion correction can be performed without stopping the display of the actual image, the usability of the projector is improved.

(2) In the projector 1 of the present embodiment, the superimposing optical system 30 includes the diffraction element 15 that diffracts the first light L1 and the second light L2 toward the illuminated region 50a. According to this configuration, for example, by using the diffraction element 15 including a hologram such as CGH (Computer Generated Hologram), the first light L1 and the second light L2 can be accurately superimposed on the illuminated region 50a. it can.

(3) In the projector 1 of this embodiment, the first solid light source 11 and the second solid light source 18 are arranged side by side on the same base 19. According to this configuration, the number of parts is reduced and space saving is achieved.

[Second Embodiment]
FIG. 4 is a schematic diagram illustrating a main configuration of the projector 2 according to the second embodiment. In FIG. 4, the characteristic part in this embodiment is enlarged and modeled, and illustration of the other part is simplified greatly. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the projector 2 of the present embodiment, the light source device 10 includes a plurality of first solid light sources 11R, 11G, and 11B having different emission main wavelengths. The plurality of first solid-state light sources 11R, 11G, and 11B having different emission main wavelengths are disposed on different bases 19R, 19G, and 19B, respectively. The second solid light source 18 emits infrared light IR as the second light. Of the plurality of first solid light sources 11R, 11G, and 11B, the first solid light source 11R having the longest emission main wavelength and the second solid light source 18 are arranged side by side on the same base 19R. The second solid light source 18 is selectively disposed only on the base 19R on which the first solid light source 11R is disposed, and is not disposed on the other bases 18G and 18B.

  For example, the light source device 10 includes a first light source unit 10R, a second light source unit 10G, and a third light source unit 10B. The first light source unit 10R includes a plurality of first solid light sources 11R that emit red light R and a second solid light source 18 that emits infrared light IR on the first base 19R. ing. The second light source unit 10G includes a plurality of first solid light sources 11G that emit green light G on the second base 19G. The third light source unit 10B includes a plurality of first solid light sources 11B that emit blue light B on the third base 19B. The second solid light source 18 is selectively disposed only on the first base 19R, and is not disposed on the other second base 18G and third base 18B.

  The first light R (red light) and the second light IR (infrared light) emitted from the first light source unit 10R pass through the first superimposing optical system 30R including the first diffraction element 15R. Then, the light enters the first light modulation device 50R and is modulated by the first light modulation device 50R based on the image signal. The first light G (green light) emitted from the second light source unit 10G is incident on the second light modulation device 50G via the second superimposing optical system 30G including the second diffraction element 15G. Modulation is performed by the second light modulation device 50G based on the image signal. The first light B (blue light) emitted from the third light source unit 10B is incident on the third light modulation device 50B via the third superimposing optical system 30B including the third diffractive element 15B. Modulation is performed by the third light modulation device 50B based on the image signal.

  The lights modulated by the first light modulation device 10R, the second light modulation device 10G, and the third light modulation device 10B are synthesized by a synthesis optical system 90 such as a dichroic prism, and are projected on a screen by a projection optical system 60. Projected on.

  Here, the first superimposing optical system 30R, the second superimposing optical system 30G, and the third superimposing optical system 30B have the same configuration and function as the superimposing optical system 30 of the first embodiment. The first diffractive element 15R includes a plurality of cells (not shown) corresponding to each of the plurality of solid light sources (the first solid light source 11R and the second solid light source 18) provided in the first light source unit 10R. ing. Each cell is provided with a computer generated hologram (CGH) designed to form a predetermined irradiation pattern on the illuminated area. Thereby, the first diffraction element 15R diffracts the first light R and the second light IR, respectively.

  When the first light R and the second light IR are diffracted by the diffraction element, if the wavelengths of the first light R and the second light IR are greatly different, the first light R and the second light IR are the same. Difficult to diffract in the direction. In the present embodiment, among the plurality of first solid light sources 11R, 11G, and 11B, the first solid light source 11R having the longest emission main wavelength and the second solid light source 18 are arranged on the same base 19R. Has been placed. Therefore, the emission main wavelengths of the first solid light source 11R and the second solid light source 18 arranged on the same base 19R are relatively close to each other. Therefore, it becomes easy to superimpose the first light R and the second light IR on the same illuminated area.

  As described above, according to the projector 2 of the present embodiment, the wavelength of light from the first solid light source and the wavelength of light from the second solid light source arranged side by side on the same base 19R are calculated. By making them close to each other, it becomes easy to superimpose these lights on the same illuminated area. Thus, zoom adjustment and image distortion correction can be performed with high accuracy.

[Third Embodiment]
FIG. 5 is a schematic diagram illustrating a main configuration of the projector 3 according to the third embodiment. In FIG. 5, the characteristic part in this embodiment is enlarged and modeled, and illustration of the other part is simplified greatly. In the present embodiment, components that are the same as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the projector 3 of the present embodiment, the light source device 10 includes a plurality of first solid light sources 11R, 11G, and 11B having different emission main wavelengths. The plurality of first solid-state light sources 11R, 11G, and 11B having different emission main wavelengths are disposed on different bases 19R, 19G, and 19B, respectively. The second solid light source 18 emits ultraviolet light UV as the second light. Of the plurality of first solid light sources 11R, 11G, and 11B, the first solid light source 11B and the second solid light source 18 having the shortest emission main wavelength are arranged side by side on the same base 19B. The second solid light source 18 is selectively disposed only on the base 19B on which the first solid light source 11B is disposed, and is not disposed on the other bases 18R and 18G.

  As described above, when the first light B and the second light UV are diffracted by the diffraction element, if the wavelengths of the light B and UV are greatly different, the light B and UV are diffracted in the same direction. Becomes difficult. In the present embodiment, the first solid light source 11B and the second solid light source 18 having the shortest emission main wavelength among the plurality of first solid light sources 11R, 11G, and 11B are arranged side by side on the same base 19B. ing. Therefore, the emission main wavelengths of the first solid light source 11B and the second solid light source 18 arranged on the same base 19B are relatively close to each other. Therefore, it becomes easy to superimpose the first light B and the second light UV on the same illuminated area.

1, 2, 3 ... projector, 10 ... light source device, 11, 11R, 11G, 11B ... first solid state light source, 15, 15R, 15G, 15B ... diffraction element, 18 ... second solid state light source, 19, 19R, 19G, 19B ... Base, 30, 30R, 30G, 30B ... Superimposing optical system, 50a ... Illuminated area, 70 ... Imaging device, 80 ... Control device, L1 ... First light, L2 ... Second light, R ... red light (first light), G ... green light (first light), B ... blue light (first light), IR ... infrared light (second light), UV ... ultraviolet light Light (second light), SCR ... screen

Claims (6)

A light source device comprising: a first solid-state light source that emits first light in a visible range; and a second solid-state light source that emits second light in a non-visible range;
A superimposing optical system that superimposes the first light on the second light in the illuminated area;
With projector.   The projector according to claim 1, wherein the superimposing optical system includes a diffraction element that diffracts the first light and the second light.   The projector according to claim 2, wherein the first solid light source and the second solid light source are arranged side by side on the same base. The light source device includes a plurality of the first solid light sources having different emission main wavelengths from each other,
The plurality of first solid-state light sources having different emission main wavelengths are arranged on separate bases,
The second solid-state light source emits infrared light as the second light,
The projector according to claim 3, wherein the first solid-state light source having the longest emission main wavelength and the second solid-state light source among the plurality of first solid-state light sources are arranged side by side on the same base. The light source device includes a plurality of the first solid light sources having different emission main wavelengths from each other,
The plurality of first solid-state light sources having different emission main wavelengths are arranged on separate bases,
The second solid-state light source emits ultraviolet light as the second light,
The projector according to claim 3, wherein the first solid-state light source having the shortest emission main wavelength and the second solid-state light source among the plurality of first solid-state light sources are arranged side by side on the same base. An imaging device for imaging a test pattern formed on the screen by the second light;
The projector according to claim 1, further comprising: a control device that analyzes an image of the test pattern imaged by the imaging device and performs zoom adjustment or image distortion correction.

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