JP2013009295A - Projection type image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type image display device which allows for setting a 3D mode for displaying a stereoscopic image by a simple procedure.SOLUTION: A projection type image display device 100 is provided with a control unit 200 which executes setting guidance processing corresponding to a 3D mode selected from among plural 3D modes, in order with respect to each of the 3D modes. In the setting guidance processing, the control unit 200 outputs guidance information indicating a procedure for setting the selected 3D mode and displays a stereoscopic image according to the selected 3D mode.

Description

  The present invention relates to a projection display apparatus having a plurality of 3D modes as a 3D mode for displaying a stereoscopic image.

  Conventionally, each viewpoint image in which a stereoscopic image composed of a plurality of viewpoint images (for example, a left eye viewpoint image and a right eye viewpoint image) is known is captured from different viewpoint positions (for example, a left eye viewpoint position and a right eye viewpoint position). (For example, Patent Document 1).

  Here, a plurality of 3D modes are known as 3D modes for displaying a stereoscopic image. A plurality of 3D modes include, for example, a polarized glasses system using polarized glasses (for example, Patent Document 1), a shutter glasses system (1) that switches between opening and closing of the left and right shutters according to an image (synchronization signal) reflected on the screen, and projection Shutter glasses method (2) for switching the opening and closing of the left and right shutters according to a synchronization signal output from the type video display device, and shutter glasses for switching the opening and closing of the left and right shutters according to a synchronization signal output from an external device such as a personal computer Method (3) or the like. The shutter glasses method (1) may be referred to as “DLP link”.

JP 2004-228743 A

  By the way, in the 3D mode described above, it is necessary to perform settings suitable for each 3D mode. However, when the observer does not know in which 3D mode the stereoscopic image is displayed, the setting of the 3D mode is complicated.

  Therefore, an object of the present invention is to provide a projection display apparatus that can set a 3D mode for displaying a stereoscopic image by a simple procedure.

  The projection display apparatus according to the first feature has a plurality of 3D modes as a 3D mode for displaying a stereoscopic image. The projection display apparatus includes a control unit that sequentially executes setting guidance processing corresponding to a 3D mode selected from the plurality of 3D modes. In the setting guidance process, the control unit outputs guidance information indicating a procedure for setting the selected 3D mode, and displays the stereoscopic image according to the selected 3D mode.

  In the first feature, the control unit identifies a 3D mode for displaying the stereoscopic image, and first executes the setting guidance process corresponding to the identified 3D mode.

  In the first feature, the plurality of 3D modes include a polarized glasses system using polarized glasses, a shutter glasses system (1) that switches between opening and closing of left and right shutters according to a synchronization signal reflected by a screen, and the projection display apparatus The shutter glasses method (2) for switching the opening and closing of the left and right shutters according to the synchronization signal output from, and the opening and closing of the left and right shutters according to the synchronization signal output from the external device connected to the projection display apparatus Among the shutter glasses method (3), there are two or more 3D modes.

  The projection display apparatus according to the second feature has a plurality of 3D modes including at least a polarized glasses type 3D mode using polarized glasses as a 3D mode for displaying a stereoscopic image. The projection display apparatus turns on the crosstalk canceller when the polarized glasses 3D mode is selected.

  In the second feature, when the polarized glasses 3D mode is selected, a polarizing plate for aligning the polarization of the image light of the stereoscopic image is inserted.

  In the second feature, the polarization glasses type 3D mode is switched according to the insertion of a polarizing plate that aligns the polarization of the image light of the stereoscopic image.

  ADVANTAGE OF THE INVENTION According to this invention, the projection type video display apparatus which makes it possible to set 3D mode which displays a stereo image in a simple procedure can be provided.

FIG. 1 is a diagram showing a projection display apparatus 100 according to the first embodiment. FIG. 2 is a diagram illustrating the projection display apparatus 100 according to the modified example 1-1. FIG. 3 is a diagram illustrating the projection display apparatus 100 according to the modified example 1-1. FIG. 4 is a diagram illustrating the projection display apparatus 100 according to the modified example 1-1. FIG. 5 is a diagram illustrating the projection display apparatus 100 according to the modified example 1-1. FIG. 6 is a diagram illustrating the projection display apparatus 100 according to the modified example 1-1. FIG. 7 is a diagram illustrating the projection display apparatus 100 according to the modified example 1-1. FIG. 8 is a diagram illustrating the projection display apparatus 100 according to the modified example 1-1. FIG. 9 is a diagram illustrating a control unit 200 according to the second embodiment. FIG. 10 is a diagram illustrating the occurrence of crosstalk according to the second embodiment. FIG. 11 is a diagram illustrating a subtraction processing mode according to the second embodiment. FIG. 12 is a diagram illustrating a subtraction processing mode according to the second embodiment. FIG. 13 is a diagram illustrating a subtraction processing mode according to the second embodiment. FIG. 14 is a diagram illustrating a subtraction processing mode according to the second embodiment. FIG. 15 is a diagram illustrating a subtraction processing mode according to the second embodiment. FIG. 16 is a diagram illustrating an addition processing mode according to the second embodiment. FIG. 17 is a diagram illustrating an addition processing mode according to the second embodiment. FIG. 18 is a diagram illustrating an addition processing mode according to the second embodiment. FIG. 19 is a diagram illustrating an addition processing mode according to the second embodiment. FIG. 20 is a diagram illustrating an addition processing mode according to the second embodiment. FIG. 21 is a diagram for explaining the amount of crosstalk suppression according to the second embodiment. FIG. 22 is a diagram for explaining the amount of crosstalk suppression according to the second embodiment. FIG. 23 is a diagram for explaining the amount of crosstalk suppression according to the second embodiment. FIG. 24 is a diagram illustrating an image example according to the modification example 2-1. FIG. 25 is a diagram illustrating an image example according to the modification example 2-1. FIG. 26 is a diagram illustrating an image example according to the modification example 2-1. FIG. 27 is a diagram for explaining the polarized glasses method according to the third embodiment. FIG. 28 is a diagram for explaining the shutter glasses method (1) according to the third embodiment. FIG. 29 is a diagram for explaining the shutter glasses method (2) according to the third embodiment. FIG. 30 is a diagram for explaining the shutter glasses method (3) according to the third embodiment. FIG. 31 is a flowchart showing a setting guidance process according to the third embodiment. FIG. 32 is a flowchart showing a setting guidance process according to the third embodiment. FIG. 33 is a diagram illustrating an example of an error image according to the third embodiment.

  Hereinafter, a projection display apparatus according to an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

[Outline of First Embodiment]
A projection display apparatus according to the first embodiment includes a light source, a light modulation element that modulates light emitted from the light source, and a projection unit that projects light modulated by the light modulation element onto a projection plane. Have The projection display apparatus is configured to be able to switch between a 3D mode for displaying a stereoscopic image and a 2D mode for displaying a planar image. The projection display apparatus includes a polarizing plate that aligns the polarization of light emitted from the light source, and a liquid crystal element that switches the polarization of light emitted from the polarizing plate between a first polarization and a second polarization. . The polarizing plate is configured to be movable out of the optical path of the light emitted from the light source to a position where the polarizing plate does not overlap the optical path of the light emitted from the light source.

  In the first embodiment, the polarizing plate is configured to be movable out of the optical path of the light emitted from the light source to a position where the polarizing plate does not overlap the optical path of the light emitted from the light source. Therefore, in the 2D mode, by moving the polarizing plate from the optical path of the light emitted from the light source, it is possible to suppress a decrease in image brightness in the 2D mode.

  In the first embodiment, the projection display apparatus displays, for example, a left eye viewpoint image and a right eye viewpoint image in a time division manner as a plurality of viewpoint images. Specifically, the projection display apparatus displays the left-eye viewpoint image (or right-eye viewpoint image) using the first polarized light, and the right-eye viewpoint image (or left-eye viewpoint image using the second polarized light). ) Is displayed.

[First Embodiment]
(Projection-type image display device)
Hereinafter, the projection display apparatus according to the first embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing a projection display apparatus 100 according to the first embodiment. In the first embodiment, a case where red component light R, green component light G, and blue component light B are used is illustrated.

  As shown in FIG. 1, the projection display apparatus 100 includes a light source 10, a color wheel 20, a rod integrator 30, a reflection mirror 40, a DMD 50, a projection unit 60, a polarizing plate 70, and a liquid crystal element 80. And have. The projection display apparatus 100 includes a necessary lens group (lens 111 and lens 112).

  The light source 10 is a UHP lamp that emits white light. That is, the white light emitted from the light source 10 includes at least red component light R, green component light G, and blue component light B.

  Here, the light source 10 has an elliptical reflector. The reflector has a first focal point and a second focal point provided closer to the color wheel 20 than the first focal point. The first focal point is a white light emitting point. The second focal point is provided in the vicinity of the color wheel 20 described later. That is, the white light emitted from the light source 10 is condensed near the color wheel 20 described later.

  The color wheel 20 is configured to rotate around a rotation axis X parallel to the optical axis of the light source 10. The color wheel 20 has a disk shape constituted by a transparent member such as a glass plate.

  The color wheel 20 has a red region, a green region, and a blue region. The red region is a color filter configured to transmit only the red component light R. Similarly, the green region is a color filter configured to transmit only the green component light G, and the blue region is a color filter configured to transmit only the blue component light B.

  In addition to the red region, the green region, and the blue region, the color wheel 20 is a color component light other than the red component light R, the green component light G, and the blue component light B (for example, white component light, yellow component light, cyan). It may have a region that transmits only component light, magenta component light, and the like.

  Here, the white light emitted from the light source 10 is condensed in the vicinity of the transparent member constituting the color wheel 20. In other words, the transparent member constituting the color wheel 20 is disposed in the vicinity of the second focal point described above. As a result, the color wheel 20 can be reduced in size.

  Further, the rotation axis X may have an inclination with respect to the optical axis of the light source 10 instead of the optical axis of the light source 10. For example, the surface of the color wheel 20 may have a 45 ° inclination with respect to the optical axis of the light source 10. In such a case, the color wheel 20 may be a reflective color wheel instead of a transmissive color wheel.

  The rod integrator 30 is a solid rod made of a transparent member such as glass. The rod integrator 30 makes the light incident on the rod integrator 30 uniform. The rod integrator 30 may be a hollow rod whose inner wall is constituted by a mirror surface.

  The reflection mirror 40 reflects the light emitted from the rod integrator 30 to the DMD 50 side.

  The DMD 50 is a display element composed of a plurality of minute mirrors. The plurality of micromirrors are movable. Each micromirror basically corresponds to one pixel. The DMD 50 switches whether to reflect light to the projection unit 60 side by changing the angle of each micromirror.

  The projection unit 60 projects light (image light) reflected by a micromirror provided in the DMD 50 onto a projection surface (not shown).

  The polarizing plate 70 is an optical element that aligns the polarization of light emitted from the light source 10. Specifically, the polarizing plate 70 transmits only a predetermined polarization component. The predetermined polarization component is, for example, a component having linearly polarized light in a predetermined direction. The polarizing plate 70 may be disposed on the light source 10 side of the liquid crystal element 80 on the optical path of the light emitted from the light source 10. In other words, the polarizing plate 70 may be disposed in front of the liquid crystal element 80.

  In the first embodiment, the polarizing plate 70 is disposed on the optical path of the light emitted from the DMD 50 and aligns the polarization of the light emitted from the DMD 50.

  Here, the polarizing plate 70 is an optical path of the light emitted from the light source 10 to a position where the polarizing plate 70 does not overlap the optical path of the light emitted from the light source 10 (here, the optical path of the light emitted from the DMD 50). It is configured to be movable outside.

  The polarizing plate 70 may be manually moved to a position where the polarizing plate 70 does not overlap the optical path of the light emitted from the light source 10. Alternatively, the polarizing plate 70 may be electrically moved to a position where the polarizing plate 70 does not overlap the optical path of the light emitted from the light source 10. The projection display apparatus 100 preferably has a space for accommodating the polarizing plate 70 that is out of the optical path of the light emitted from the light source 10.

  In addition, when the polarizing plate 70 is disposed on the optical path of the light emitted from the light source 10, a 3D mode for displaying a stereoscopic image is applied. On the other hand, when the polarizing plate 70 is out of the optical path of the light emitted from the light source 10, the 2D mode for displaying a planar image is applied.

  Note that the 3D mode is configured so that a plurality of viewpoint images (for example, right eye image and left eye image in two viewpoints) are guided to the right eye and the left eye, so that an observer visually recognizes a stereoscopic image. Mode. Note that the plurality of viewpoint images are planar (two-dimensional) images.

  The liquid crystal element 80 switches the polarization of light emitted from the polarizing plate 70 between the first polarization and the second polarization when in the 3D mode. Specifically, the liquid crystal element 80 switches the polarization of the light emitted from the polarizing plate 70 in accordance with the voltage applied to the liquid crystal element 80. For example, the liquid crystal element 80 aligns the polarization of the light emitted from the polarizing plate 70 with the first polarization when a voltage is applied to the liquid crystal element 80. On the other hand, the liquid crystal element 80 aligns the polarization of the light emitted from the polarizing plate 70 with the second polarization when no voltage is applied to the liquid crystal element 80.

  For example, when the first polarized light is vertical linearly polarized light, the second polarized light is horizontal linearly polarized light. The light emitted from the polarizing plate 70 is linearly polarized light, the first polarized light is counterclockwise circularly polarized light (or clockwise circularly polarized light), and the second polarized light is clockwise circularly polarized light (or leftward). (Circularly polarized light) may be used. In this case, the liquid crystal element 80 applies a voltage when switching between the first polarized light and the second polarized light, but the merit of reducing crosstalk is obtained.

  It should be noted that the observer wears polarized glasses corresponding to the types of the first polarized light and the second polarized light and visually recognizes the stereoscopic image through the polarized glasses.

  In the first embodiment, the liquid crystal element 80 is disposed between the DMD 50 and the projection unit 60.

(Function and effect)
In the first embodiment, the polarizing plate 70 is configured to be movable out of the optical path of the light emitted from the light source 10 to a position where the polarizing plate 70 does not overlap the optical path of the light emitted from the light source 10. Therefore, in the 2D mode, by moving the polarizing plate 70 from the optical path of the light emitted from the light source 10, it is possible to suppress a decrease in image brightness in the 2D mode.

  In the first embodiment, the DMD 50 is used as the light modulation element. That is, it should be noted that the DMD 50 does not have a function of aligning the polarization of light emitted from the DMD 50.

[Modification 1-1]
Hereinafter, a modified example 1-1 of the first embodiment will be described. In the following, differences from the first embodiment will be mainly described.

  Specifically, in Modification 1-1, arrangement variations of the polarizing plate 70 and the liquid crystal element 80 will be described.

  As shown in FIGS. 2 and 3, the polarizing plate 70 is disposed on the light exit side of the rod integrator 30, and the polarization of the light emitted from the rod integrator 30 may be aligned. The liquid crystal element 80 may be disposed between the rod integrator 30 and the reflection mirror 40. It should be noted that the moving direction of the polarizing plate 70 is arbitrary as shown in FIGS.

  Alternatively, as illustrated in FIG. 4, the polarizing plate 70 may be disposed on the light incident side of the rod integrator 30 and may align the polarization of the light emitted from the light source 10. The liquid crystal element 80 may be disposed between the light source 10 and the color wheel 20.

  Alternatively, as illustrated in FIG. 5, the polarizing plate 70 may be disposed on the light incident side of the rod integrator 30 and may align the polarization of the light emitted from the light source 10. The liquid crystal element 80 may be disposed between the rod integrator 30 and the reflection mirror 40. Thus, the polarizing plate 70 and the liquid crystal element 80 do not need to be disposed adjacent to each other.

  Alternatively, as illustrated in FIG. 6, the polarizing plate 70 may be disposed on the light emission side of the DMD 50, and the polarization of the light emitted from the DMD 50 may be aligned. The liquid crystal element 80 may be disposed on the light incident side of the projection unit 60.

  Alternatively, as illustrated in FIG. 7, the polarizing plate 70 may be disposed on the light exit side of the DMD 50, and the polarization of the light emitted from the DMD 50 may be aligned. The liquid crystal element 80 may be disposed on the light emission side of the DMD 50.

  Alternatively, as shown in FIG. 8, the light may be arranged on the light exit side of the rod integrator 30 and the polarization of the light emitted from the rod integrator 30 may be aligned. The liquid crystal element 80 may be disposed on the light emission side of the DMD 50.

[Outline of Second Embodiment]
A projection display apparatus according to the second embodiment includes a light source, a light modulation element that modulates light emitted from the light source, and a projection unit that projects light modulated by the light modulation element onto a projection plane. Have The projection display apparatus includes an image control unit that controls the second viewpoint image so as to suppress crosstalk of the first viewpoint image among the plurality of viewpoint images. The image control unit controls the amount of crosstalk suppression according to the position on the projection plane.

  In the second embodiment, the image control unit controls the amount of crosstalk suppression according to the position on the projection plane. Therefore, crosstalk can be appropriately suppressed.

  In particular, in an (ultra) short focus type projection display apparatus in which the distance between the projection unit and the projection plane is very short, the incident angle of the image light with respect to the projection plane varies greatly depending on the position on the projection plane. Therefore, the second embodiment is preferably applied to a (super) short focus type projection display apparatus. Here, it should be noted that as the incident angle of the image light with respect to the projection plane increases, the polarization disturbance increases and the amount of crosstalk also increases.

  The first viewpoint image is an image that interferes with the second viewpoint image, and the second viewpoint image is an image that interferes with the first viewpoint image. For example, in the case where the left-eye viewpoint image and the right-eye viewpoint image are displayed in a time division manner, the first viewpoint image is the (n−1) th viewpoint image and the second viewpoint image is the nth position. It is a viewpoint image. Alternatively, in the case where the left-eye viewpoint image and the right-eye viewpoint image are displayed simultaneously, the first viewpoint image is a left-eye viewpoint image (or right-eye viewpoint image), and the second viewpoint image is a right-eye viewpoint image (or left-eye viewpoint image). Image) (autonomous two-viewpoint display).

  The second embodiment exemplifies a case where the first viewpoint image is a left eye viewpoint image and the second viewpoint image is a right eye viewpoint image. However, it goes without saying that the embodiment is not limited to this.

  Since the configuration of the projection display apparatus may be the same as that of the first embodiment, the description of the configuration of the projection display apparatus is omitted.

[Second Embodiment]
(Configuration of control unit)
Hereinafter, a control unit according to the second embodiment will be described with reference to the drawings. FIG. 9 is a diagram illustrating a control unit 200 according to the second embodiment. The control unit 200 is provided in the projection display apparatus 100. As shown in FIG. 9, the control unit 200 includes an acquisition unit 210 and an image control unit 220.

  The acquisition unit 210 acquires a video input signal constituting a stereoscopic image. For example, the acquisition unit 210 acquires a video input signal from an external device such as a TV tuner, a DVD player, or a personal computer.

  The image control unit 220 controls the viewpoint image displayed on the DMD 50. For example, the image control unit 220 controls the amount of crosstalk suppression according to the position on the projection plane. Note that the amount of crosstalk suppression is, for example, a subtraction amount (crosstalk amount) in a subtraction processing mode to be described later. Alternatively, the amount of crosstalk suppression is, for example, an addition amount (inverted crosstalk amount) in an addition processing mode to be described later.

  The amount of crosstalk suppression is determined according to the incident angle of the image light with respect to the projection plane, as will be described later. As the incident angle of the image light with respect to the projection surface is larger, a larger value is set as the amount of crosstalk suppression.

  Further, the image control unit 220 controls the second viewpoint image (here, the right eye viewpoint image) so as to suppress crosstalk of the first viewpoint image (here, the left eye viewpoint image). The image control unit 220 may switch a control mode for suppressing crosstalk between the addition processing mode and the subtraction processing mode in accordance with a video input signal constituting a stereoscopic image.

  Specifically, in the subtraction processing mode, the image control unit 220 subtracts the crosstalk amount corresponding to the first viewpoint image from the video input signal constituting the second viewpoint image. Here, the image control unit preferably adjusts the video input signal constituting the second viewpoint image so as to alleviate the change in contrast of the image region where the contrast changes sharply in the first viewpoint image.

  On the other hand, in the addition processing mode, the image control unit 220 adds the inverted crosstalk amount corresponding to the inverted image of the first viewpoint image to the video input signal constituting the second viewpoint image. Here, the image control unit may adjust the video input signal constituting the second viewpoint image so as to reduce the change in contrast of the image region where the contrast changes sharply in the inverted image of the first viewpoint image. preferable.

  Note that the inverted image of the first viewpoint image is an image configured by an inverted video input signal obtained by inverting the video input signal constituting the first viewpoint image.

  Here, even if the crosstalk amount is subtracted from the video input signal constituting the second viewpoint image, the image control unit 220 is not in the addition processing mode when there is no pixel whose pixel value is lower than the lower limit value. Apply the subtraction mode. In such a case, even if the crosstalk amount is subtracted from the video input signal constituting the second viewpoint image, there is no pixel whose pixel value is lower than the lower limit value. Therefore, “double image”, “black floating” and It should be noted that “whiteout” does not occur.

  The image control unit 220 configures the second viewpoint image even when the crosstalk amount is subtracted from the video input signal that configures the second viewpoint image, or even when there is a pixel whose pixel value is lower than the lower limit value. When the inversion contrast amount is added to the video input signal, if there is a pixel whose pixel value exceeds the upper limit value, the subtraction processing mode is applied instead of the addition processing mode. In such a case, when the inversion contrast amount is added to the video input signal constituting the second viewpoint image, there are pixels whose pixel value exceeds the upper limit value. It should be noted that is suppressed. In the subtraction processing mode, the change in contrast of the image area where the contrast changes sharply is alleviated, so that “double images” are suppressed. However, the occurrence of “black float” is inevitable.

  Even if the crosstalk amount is subtracted from the video input signal that constitutes the second viewpoint image, the image control unit 220 has a pixel value that is lower than the lower limit value, and is inverted to the video input signal that constitutes the second viewpoint image. Even if the contrast amount is added, if there is no pixel whose pixel value exceeds the upper limit value, the addition processing mode is applied instead of the subtraction processing mode. In such a case, even if the inversion contrast amount is added to the video input signal constituting the second viewpoint image, there is no pixel whose pixel value exceeds the upper limit value. It should be noted that no “jump” occurs.

(Crosstalk occurs)
Hereinafter, the occurrence of crosstalk will be described with reference to FIG. In FIG. 10, in order to simplify the description, both the first viewpoint image (here, the left eye viewpoint image) and the second viewpoint image (here, the right eye viewpoint image) are represented by the image area # 1 and the image area # 2. An example of a configured case will be described. The image area # 1 is, for example, a high-luminance image area (object image area), and a parallax is provided between the left-eye viewpoint image and the right-eye viewpoint image. The image area # 2 is, for example, a low-brightness image area (background image area), and no parallax is provided between the left-eye viewpoint image and the right-eye viewpoint image.

  In such a case, when crosstalk of the left eye viewpoint image (interference from the left eye viewpoint image to the right eye viewpoint image) occurs, the luminance of the image area # 3 and the image area # 4 in the right eye viewpoint image increases. In other words, crosstalk occurs between the pixel A and the pixel B on the straight line L.

(Subtraction processing mode)
Hereinafter, the subtraction processing mode will be described with reference to FIGS. Here, the right-eye viewpoint image is composed of an image area # 1 and an image area # 2, as shown in FIG. As shown in FIG. 12, the crosstalk amount corresponding to the left-eye viewpoint image is a value obtained by multiplying the video input signal value (for example, luminance) of the image area # 1 by a constant ratio “r / R”.

  Here, since the signal level of the video input signal constituting the image area # 2 of the right-eye viewpoint image is “MIN (for example,“ 0 ”)”, from the video input signal constituting the image area # 2 of the right-eye viewpoint image, The crosstalk amount corresponding to the left eye viewpoint image cannot be subtracted.

  Therefore, the image control unit 220 calculates a signal value (added signal value) to be added to the video input signal constituting the right eye viewpoint image on the premise that the crosstalk amount corresponding to the left eye viewpoint image is subtracted.

  As shown in FIG. 13, first, the image control unit 220 sets the crosstalk amount corresponding to the left-eye viewpoint image as an added signal value. Secondly, the image control unit 220 specifically changes the addition signal value between adjacent pixels so that the change in the displayed image is within a predetermined threshold for the pixels in the vicinity of the pixel A and the pixel B. The added signal value is corrected so as to be within a predetermined threshold. Thirdly, the image control unit 220 subtracts the crosstalk amount corresponding to the left-eye viewpoint image from the added signal value.

  Subsequently, as illustrated in FIG. 14, the image control unit 220 adds the addition signal value to the video input signal constituting the right eye viewpoint image. Finally, the signal level of the actual right-eye viewpoint image to be viewed by the user is determined by taking into account the amount of crosstalk corresponding to the left-eye viewpoint image.

  For example, as shown in FIG. 15, the actual right-eye viewpoint image to be viewed by the user is an image area # in which the change in contrast is reduced around the image area # 3 and the image area # 4 (crosstalk occurrence area). 5 and image area # 6 are provided. As described above, since the contour of the “double image” is blurred by the image region # 5 and the image region # 6 in which the change in contrast is relaxed, the “double image” is reduced.

  Note that the image area in which the change in contrast is alleviated is an image area in which the video input signal is adjusted. For example, the image areas where the change in contrast is alleviated are the image area # 5 and the image area # 6.

(Addition processing mode)
Hereinafter, the addition processing mode will be described with reference to FIGS. Here, the right-eye viewpoint image is configured by an image area # 1 and an image area # 2, as shown in FIG. As shown in FIG. 17, the reverse crosstalk amount corresponding to the reverse image of the left-eye viewpoint image is a value obtained by multiplying the reverse video input signal value (for example, luminance) of the image area # 1 by a constant ratio “r / R”. is there. The constant ratio “r / R” is determined by the performance of the display and the performance of the glasses.

  As shown in FIG. 18, first, the image control unit 220 sets an inverted crosstalk amount corresponding to an inverted image of the left-eye viewpoint image as an added signal value. Secondly, the image control unit 220 specifically changes the addition signal value between adjacent pixels so that the change in the displayed image is within a predetermined threshold for the pixels in the vicinity of the pixel A and the pixel B. The added signal value is corrected so as to be within a predetermined threshold.

  Subsequently, as shown in FIG. 19, the image control unit 220 adds the addition signal value to the video input signal constituting the right eye viewpoint image. Finally, the signal level of the actual right-eye viewpoint image to be viewed by the user is determined by taking into account the amount of crosstalk corresponding to the left-eye viewpoint image.

  For example, as shown in FIG. 20, the actual right-eye viewpoint image to be viewed by the user is an image area # in which the change in contrast is reduced around the image area # 3 and the image area # 4 (crosstalk occurrence area). 5 and image area # 6 are provided. Around the image area # 5 and the image area # 6, an image area # 7 and an image area # 8 to which the addition signal value is added are provided.

  Note that the image area in which the change in contrast is alleviated is an image area in which the video input signal is adjusted. For example, the image areas where the change in contrast is alleviated are the image area # 5 and the image area # 6.

(Crosstalk suppression amount)
Hereinafter, the amount of crosstalk suppression will be described with reference to FIGS.

  First, a case where image light is projected onto the projection surface from the front of the projection surface will be described. In such a case, the incident angle of the image light with respect to the projection plane is the smallest at the center of the projection plane. Further, the incident angle of the image light with respect to the projection surface increases as the distance from the center of the projection surface increases.

  Here, as the incident angle of the image light with respect to the projection plane increases, the disturbance of polarization increases, and the crosstalk amount increases as the distance from the center of the projection plane increases.

  Therefore, as shown in FIG. 21, the projection surface is divided into concentric regions (region # 1 to region # 5) centering on the center of the projection surface. The amount of crosstalk suppression increases in the order from region # 1 to region # 5.

  Second, a case where image light is projected onto the projection surface from below the center of the projection surface will be described. In such a case, the incident angle of the image light with respect to the projection plane is the smallest at the lower center of the projection plane. Further, the incident angle of the image light with respect to the projection plane increases as the distance from the lower center of the projection plane increases.

  Therefore, as shown in FIG. 22, the projection surface is divided into concentric regions (region # 1 to region # 6) centering on the lower center of the projection surface. The amount of crosstalk suppression increases in the order from region # 1 to region # 6.

  In the above-described example, the projection plane is divided into concentric areas, but the embodiment is not limited to this. Specifically, the projection plane may be divided into rectangular blocks as shown in FIG. The amount of crosstalk suppression in each block is determined according to the incident angle of the image light with respect to the projection plane.

(Function and effect)
In the second embodiment, the image control unit 220 controls the amount of crosstalk suppression according to the position on the projection plane. Therefore, crosstalk can be appropriately suppressed.

  In particular, in the (super) short focus type projection display apparatus 100 in which the distance between the projection unit 60 and the projection plane is very short, the incident angle of the image light with respect to the projection plane varies greatly depending on the position on the projection plane. Therefore, the second embodiment is preferably applied to the (ultra) short focus type projection display apparatus 100.

  In the second embodiment, the image control unit 220 switches a control mode for suppressing crosstalk between the subtraction processing mode and the addition processing mode in accordance with a video input signal constituting a stereoscopic image. Therefore, “double image”, “black floating”, and “whiteout” are suppressed.

[Modification 2-1]
Hereinafter, a modified example 2-1 of the second embodiment will be described. In the following, differences from the second embodiment will be mainly described.

  Specifically, in the modified example 2-1, the above-described image control unit 220 controls the process of reducing the change in contrast according to the position in the image. In the modification example 2-1, for example, as illustrated in FIGS. 24 to 26, a night scene image will be described as an example. In this image, there are mountains and trees in the background, and as a whole, gradations with different brightness levels are applied. Here, a star 170 shines in a dark region (night sky). In addition, white captions 180 appear in dark areas. As described above, an area where the luminance around the specific area (background) is lower than the predetermined threshold and the luminance of the specific area is higher than the predetermined threshold will be mainly considered.

  First, the image control unit 220 reduces the change in contrast for the specific area and does not reduce the change in contrast for the other areas other than the specific area.

  Secondly, the image control unit 220 sets a region larger than the relaxation region corresponding to the region other than the specific region as the relaxation region corresponding to the specific region. Note that the relaxation area is an image area where a change in contrast is to be relaxed. For example, as shown in FIG. 25, a relaxation area is provided around the white caption 180.

  Third, the image control unit 220 sets a region having a predetermined shape (for example, an ellipse or a rectangle) as the relaxation region corresponding to the specific region. For example, as shown in FIG. 26, an elliptical relaxation region is provided so as to enclose the white caption 180.

  The specific area is determined as follows, for example. (1) The image control unit 220 extracts a frequency component for each line (for example, a horizontal line) included in the image, and an area in which the number of lines having an average frequency component higher than a predetermined threshold is equal to or greater than a predetermined number Is specified as a specific area. Alternatively, (2) the image control unit 220 identifies a predetermined area as the specific area. Note that there are cases where the area where the subtitle 180 is displayed is determined in advance, and the method (2) is effective in such a case.

  Fourth, the image control unit 220 calculates a contrast representative value (total value or average value) for each of a plurality of image areas constituting an image, and an image area having a larger contrast value has a larger relaxation area. Set the area.

  Fifth, the image control unit 220 sets a smaller area as the relaxation area as it is closer to the center of the image, and sets a larger area as the relaxation area as it is closer to the edge of the image.

[Outline of Third Embodiment]
The projection display apparatus according to the third embodiment has a plurality of 3D modes as a 3D mode for displaying a stereoscopic image. The projection display apparatus includes a control unit that sequentially executes setting guidance processing corresponding to a 3D mode selected from the plurality of 3D modes. In the setting guidance process, the control unit outputs guidance information indicating a procedure for setting the selected 3D mode, and displays the stereoscopic image according to the selected 3D mode.

  In the third embodiment, the control unit sequentially executes setting guidance processing for a plurality of 3D modes. Therefore, even if the observer does not know in which 3D mode the stereoscopic image is displayed, the 3D mode for displaying the stereoscopic image can be set by a simple procedure.

[Third Embodiment]
The third embodiment will be described below. In the following, differences from the first embodiment and the second embodiment will be mainly described.

  In the third embodiment, the projection display apparatus 100 has a plurality of 3D modes as a 3D mode for displaying a stereoscopic image.

  For example, the 3D mode is a polarized glasses method using polarized glasses as shown in FIG. In the polarized glasses method, a silver screen is used as a screen constituting the projection surface. In addition, the polarizing plate 70 needs to be disposed at a position overlapping the optical path of light emitted from the light source 10 (here, the optical path of light emitted from the DMD 50).

  Alternatively, the 3D mode is a shutter glasses method (1) in which opening and closing of the left and right shutters are switched according to an image (synchronization signal) reflected on the screen, as shown in FIG. In the shutter glasses method (1), a normal screen is used as a screen constituting the projection surface. In addition, the polarizing plate 70 needs to be disposed at a position that does not overlap the optical path of light emitted from the light source 10 (here, the optical path of light emitted from the DMD 50). Note that the image (synchronization signal) is output from the projection display apparatus 100 in the black display period included in one frame period.

  Alternatively, the 3D mode is a shutter glasses method (2) in which opening and closing of the left and right shutters are switched by a synchronization signal output from the projection display apparatus 100 as shown in FIG. In the shutter glasses method (2), a normal screen is used as a screen constituting the projection surface. In addition, the polarizing plate 70 needs to be disposed at a position that does not overlap the optical path of light emitted from the light source 10 (here, the optical path of light emitted from the DMD 50).

  Alternatively, the 3D mode is a shutter glasses method (3) in which opening and closing of the left and right shutters are switched by a synchronization signal output from an external device connected to the projection display apparatus 100 as shown in FIG. In the shutter glasses method (3), a normal screen is used as a screen constituting the projection surface. In addition, the polarizing plate 70 needs to be disposed at a position that does not overlap the optical path of light emitted from the light source 10 (here, the optical path of light emitted from the DMD 50). The external device is a TV tuner, a DVD player, a personal computer, or the like.

  Here, the control unit 200 sequentially executes setting guidance processing corresponding to the 3D mode selected from the plurality of 3D modes. In the setting guidance process, the control unit 200 outputs guidance information indicating a procedure for setting the selected 3D mode, and displays a stereoscopic image according to the selected 3D mode. Here, the guidance information is exemplified for a case displayed as a guidance image.

  For example, the setting guidance process is executed according to the following procedure. 31 to 32 are flowcharts showing setting guidance processing according to the third embodiment. In the following, a case where setting guidance processing is performed in the order of the shutter glasses method (1), the shutter glasses method (2) (or the shutter glasses method (3)), and the polarization glasses method will be exemplified here.

  As shown in FIG. 31, in step 10, the observer determines whether to use guidance. If the determination result is yes, the process of step 30 is performed. If the determination result is NO, the process of step 20 is performed.

  In step 20, the projection display apparatus 100 displays a manually set image for manually setting the 3D mode. Here, the projection display apparatus 100 may display a manually set image for setting the 3D mode used in the previous image display. Alternatively, the projection display apparatus 100 may start the operation in the 3D mode used in the previous image display without displaying the manually set image.

  In step 30, the projection display apparatus 100 displays the guidance image (1). The guidance image (1) is an image instructing to remove cables other than the power cable, an image instructing to move the polarizing plate 70 to a position that does not overlap the optical path of the light emitted from the light source 10, and the like.

  In step 40, the polarizing plate 70 is moved to a position that does not overlap the optical path of the light emitted from the light source 10. The movement of the polarizing plate 70 may be automatically performed by the projection display apparatus 100. Alternatively, the movement of the polarizing plate 70 may be manually performed by an observer.

  In step 50, the projection display apparatus 100 turns on the shutter glasses method (1). That is, the projection display apparatus 100 provides a black display period within one frame period and outputs an image (synchronization signal) for synchronizing with the shutter glasses during the black display period.

  In step 60, the projection display apparatus 100 displays a stereoscopic image according to the shutter glasses method (1).

  Here, it is preferable that the projection display apparatus 100 displays a test image stored in advance in the projection display apparatus 100 as a stereoscopic image without using a video signal input from an external apparatus. Thus, it is possible to determine which 3D mode the projection display apparatus 100 is compatible with.

  In step 70, the observer determines whether or not the stereoscopic image can be observed. If the determination result is YES, the series of processes is terminated. If the determination result is NO, the process proceeds to step 80.

  As shown in FIG. 32, in step 80, the projection display apparatus 100 turns off the shutter glasses method (1). That is, the projection display apparatus 100 excludes the black display period from one frame period.

  In step 90, the projection display apparatus 100 displays the guidance image (2). The guidance image (2) includes an image for instructing to connect the emitter to the projection display apparatus 100 and an image for instructing to turn on the shutter glasses when there is an emitter that outputs a synchronization signal. It is.

  In step 100, a synchronization signal is output. When the shutter glasses method (2) is selected, the projection display apparatus 100 outputs a synchronization signal. When the shutter glasses method (3) is selected, the external device outputs a synchronization signal.

  In step 110, the projection display apparatus 100 displays a stereoscopic image according to the shutter glasses method (2) (or the shutter glasses method (3)).

  Here, it is preferable that the projection display apparatus 100 displays a test image stored in advance in the projection display apparatus 100 as a stereoscopic image without using a video signal input from an external apparatus.

  In step 120, the observer determines whether or not the stereoscopic image can be observed. If the determination result is YES, the series of processes is terminated. If the determination result is NO, the process proceeds to step 130.

  In step 130, the polarizing plate 70 is moved to a position overlapping the optical path of the light emitted from the light source 10. The movement of the polarizing plate 70 may be automatically performed by the projection display apparatus 100. Alternatively, the movement of the polarizing plate 70 may be manually performed by an observer.

  Note that the projection display apparatus 100 instructs the guidance image to indicate that the cables other than the power cable are to be disconnected, and to move the polarizing plate 70 to a position overlapping the optical path of the light emitted from the light source 10. An image to be displayed may be displayed.

  In step 140, the projection display apparatus 100 displays a stereoscopic image according to the polarized glasses method.

  Here, it is preferable that the projection display apparatus 100 displays a test image stored in advance in the projection display apparatus 100 as a stereoscopic image without using a video signal input from an external apparatus. In step 150, the observer determines whether or not the stereoscopic image can be observed. If the determination result is YES, the series of processes is terminated. If the determination result is NO, the process proceeds to step 160.

  In step 160, the projection display apparatus 100 displays an error image. For example, as shown in FIG. 33, the error image is an image for notifying the observer of a factor that the stereoscopic image cannot be observed.

(Function and effect)
In the third embodiment, the control unit 200 sequentially executes setting guidance processing for a plurality of 3D modes. Therefore, even if the observer does not know in which 3D mode the stereoscopic image is displayed, the 3D mode for displaying the stereoscopic image can be set by a simple procedure.

[Modification 3-1]
Hereinafter, a modified example 3-1 of the third embodiment will be described. In the following, differences from the third embodiment will be mainly described.

  In 3rd Embodiment, the case where the order which performs a setting guidance process was defined by default was illustrated. On the other hand, in the modified example 3-1, the control unit 200 identifies a 3D mode for displaying a stereoscopic image and first executes a setting guidance process corresponding to the identified 3D mode.

  The control unit 200 specifies the polarized glasses method as a 3D mode for displaying a stereoscopic image when a silver screen is used as a screen constituting the projection plane. For example, whether or not the screen is a silver screen is specified by detecting an image of the screen imaged by the imaging device and a light beam reflected by the screen.

  Alternatively, when the polarizing plate 70 is disposed at a position overlapping the optical path of the light emitted from the light source 10, the control unit 200 specifies the polarized glasses method as a 3D mode for displaying a stereoscopic image. For example, the position of the polarizing plate 70 is detected by a mechanical switch that is pressed when the polarizing plate 70 is disposed at a predetermined position.

  When the synchronization signal is output from the emitter connected to the projection display apparatus 100, the control unit 200 specifies the shutter glasses method (2) as the 3D mode for displaying a stereoscopic image. For example, when the emitter is electrically or physically connected to the projection display apparatus 100, the control unit 200 specifies the shutter glasses method (2) as the 3D mode for displaying a stereoscopic image. For example, whether or not the synchronization signal is output from the emitter is specified by the power supplied from the projection display apparatus 100 to the emitter.

  The control unit 200 specifies the shutter glasses method (3) as the 3D mode for displaying a stereoscopic image when the synchronization signal output from the external device is synchronized with the video (frame). For example, a synchronization signal output from an external device is detected by, for example, a sensor (such as an infrared sensor).

[Modification 3-2]
Hereinafter, Modification 3-2 of the third embodiment will be described. In the following, differences from the first embodiment will be mainly described.

  In the first embodiment, the polarizing plate 70 is light emitted from the light source 10 to a position where the polarizing plate 70 does not overlap the optical path of light emitted from the light source 10 (here, the optical path of light emitted from the DMD 50). It is configured to be movable out of the optical path.

  On the other hand, in the third embodiment, the projection display apparatus 100 is a plate-like optical device having a polarizing region that functions as the polarizing plate 70 and a transparent region that adjusts the optical path length of the light emitted from the light source 10. The device is provided.

  Similar to the polarizing plate 70, the polarization region is an optical element that aligns the polarization of the light emitted from the light source 10. Specifically, the polarization region transmits only a predetermined polarization component.

  The transparent region absorbs changes in the optical path length of the light emitted from the light source 10 when the polarization region is moved to a position that does not overlap the optical path of the light emitted from the light source 10. The transparent region is made of, for example, a transparent resin.

  Specifically, the plate-like optical element is configured to be movable to a position where the polarization region does not overlap the optical path of the light emitted from the light source 10. When the plate-like optical element is moved to a position where the polarization region does not overlap the optical path of the light emitted from the light source 10, the transparent region overlaps the optical path of the light emitted from the light source 10. For example, when the plate-like optical element has a rectangular shape, the plate-like optical element is configured to be slidable in a direction perpendicular to the optical path of the light emitted from the light source 10. Alternatively, when the plate-like optical element has a circular shape, the plate-like optical element may be configured to be rotatable about an axis along the optical path of the light emitted from the light source 10.

[Other Embodiments]
Although the present invention has been described with reference to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  In the embodiment, a case where a plurality of viewpoint images constituting a stereoscopic image are a left-eye viewpoint image and a right-eye viewpoint image is illustrated. However, the embodiment is not limited to this. For example, the plurality of viewpoint images may include three or more viewpoint images.

  In the embodiment, a control mode for suppressing crosstalk is switched between the subtraction processing mode and the addition processing mode. The control mode switching timing is, for example, a scene change timing, a user setting change timing, a timing designated by the user, or the like.

  In the embodiment, when the control mode for suppressing the crosstalk is determined, it is determined whether or not the pixel value is lower than the lower limit value when the crosstalk amount is subtracted from the video input signal constituting the second viewpoint image. . In such a case, it may be determined whether any pixel value of all the pixels is below the lower limit value, or it may be determined whether the average pixel value of all the pixels is below the lower limit value. Good.

  In the embodiment, the description has been given of the point that the crosstalk amount is different mainly due to the incident angle of the image light with respect to the projection plane. However, the embodiment is not limited to this. Specifically, the amount of crosstalk varies due to the angle at which the observer observes the projection plane (the direction of the observer with respect to the projection plane). For example, in a usage scene in which it is known in advance that the observer observes the projection plane from an oblique direction with respect to the projection plane, the image control unit suppresses crosstalk according to the angle at which the observer observes the projection plane. The amount may be controlled.

  Although not particularly mentioned in the embodiment, the control unit 200 may select two or more 3D modes from a plurality of 3D modes and simultaneously perform setting guidance processing corresponding to the two or more 3D modes.

  Although not particularly mentioned in the embodiment, the control unit 200 may output guidance information indicating a procedure for setting the selected 3D mode by voice in the setting guidance process.

  In other embodiments, the projection display apparatus turns on the crosstalk canceller when the polarized glasses 3D mode is selected. The crosstalk canceller is performed according to the procedure of the second embodiment described above.

  In another embodiment, a polarizing plate for aligning the polarization of the image light of the stereoscopic image is inserted into the projection display apparatus when the polarized glasses 3D mode is selected.

  In another embodiment, the projection display apparatus switches the 3D mode to the polarized glasses 3D mode in accordance with the insertion of a polarizing plate that aligns the polarization of the image light of the stereoscopic image.

  DESCRIPTION OF SYMBOLS 10 ... Light source, 20 ... Color wheel, 30 ... Rod integrator, 40 ... Reflection mirror, 50 ... DMD, 60 ... Projection unit, 70 ... Polarizing plate, 80 ... Liquid crystal element, 100 ... Projection type image display apparatus, 111 ... Lens, DESCRIPTION OF SYMBOLS 112 ... Lens, 170 ... Star, 180 ... Subtitle, 200 ... Control unit, 210 ... Acquisition part, 220 ... Image control part

Claims (6)

A projection display apparatus having a plurality of 3D modes as a 3D mode for displaying a stereoscopic image,
A controller that sequentially executes setting guidance processing corresponding to a 3D mode selected from the plurality of 3D modes;
In the setting guidance process, the control unit outputs guidance information indicating a procedure for setting the selected 3D mode, and displays the stereoscopic image according to the selected 3D mode. Projection display device.   2. The projection display according to claim 1, wherein the control unit specifies a 3D mode for displaying the stereoscopic image, and first executes the setting guidance processing corresponding to the specified 3D mode. apparatus.   The plurality of 3D modes include a polarized glasses system using polarized glasses, a shutter glasses system (1) that switches between opening and closing of left and right shutters according to a synchronization signal reflected by a screen, and a synchronization signal output from the projection display apparatus. Shutter glasses method (2) for switching the opening and closing of the left and right shutters, and a shutter glasses method (3) for switching the opening and closing of the left and right shutters according to a synchronization signal output from an external device connected to the projection display 2. The projection display apparatus according to claim 1, wherein two or more 3D modes are selected. As a 3D mode for displaying a stereoscopic image, a projection display apparatus having a plurality of 3D modes including at least a polarized glasses type 3D mode using polarized glasses,
A projection display apparatus, wherein a crosstalk canceller is turned on when the polarized glasses 3D mode is selected.   5. The projection display apparatus according to claim 4, wherein a polarizing plate for aligning polarization of image light of the stereoscopic image is inserted when the polarized glasses 3D mode is selected.   5. The projection display apparatus according to claim 4, wherein the projection image display device is switched to the polarized glasses type 3D mode in accordance with insertion of a polarizing plate that aligns polarization of image light of the stereoscopic image.