JP2010273013A - Stereoscopic display device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stereoscopic display device and method capable of suppressing power consumption in the case of performing multi-eye type stereoscopic display. <P>SOLUTION: Cameras 4A and 4B as a detecting means and a viewpoint position calculating part 5 detect the viewpoint position of an observer. A display control part 6 specifies a parallax image that is not recognized by the observer based on the detected viewpoint position, and makes a signal processing part 3 perform image conversion processing so as to convert an image portion corresponding to the unrecognized parallax image in the multi-viewpoint combined image into a predetermined image. The image conversion processing is performed so as to suppress power consumption at a pixel corresponding to the display position of the unrecognized parallax image in a two-dimensional display panel 2. When the two-dimensional display panel 2 is, for example, a self-luminous display panel, power consumption required for light emission is suppressed by converting the image portion corresponding to the unrecognized parallax image into a black image. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a stereoscopic display device and method capable of multi-view stereoscopic display.

  2. Description of the Related Art Conventionally, parallax barrier and lenticular 3D display devices are known as one of 3D display methods that do not require wearing special glasses and can be stereoscopically viewed with the naked eye. In the parallax barrier system, a structure called a parallax barrier in which a plurality of striped slit portions that transmit light are provided on the front surface of a two-dimensional display panel is arranged to face each other. In the lenticular method, a lenticular lens is disposed opposite to the front surface of a two-dimensional display panel. The lenticular lens is a lens in which a large number of cylindrical lenses (cylindrical lenses) having refractive power only in the one-dimensional direction are arranged in parallel in the one-dimensional direction.

  In these types of stereoscopic display devices, a plurality of parallax images having different parallax information are prepared, and a plurality of striped divided images extending in the vertical direction are cut out from the parallax images. Then, the divided images are alternately arranged in the horizontal direction for each parallax image to generate a synthesized image including a plurality of striped parallax images in one screen, and the synthesized image is displayed on the two-dimensional display panel. indicate. In the case of the parallax barrier method, the composite image displayed on the two-dimensional display panel is observed through the parallax barrier. By appropriately setting the width of the divided image to be displayed, the slit width of the parallax barrier, and the like, when the observer views the stereoscopic display device from a predetermined position and a predetermined direction, the observer passes through the slit portion. The light of different parallax images can be separately incident on the left and right eyes. In the case of the lenticular method, the composite image displayed on the two-dimensional display panel is observed through the lenticular lens. In this case, by appropriately setting the width of the divided image to be displayed, the cylindrical lens pitch, etc., when the observer views the stereoscopic display device from a predetermined position and a predetermined direction, the lenticular lens is used. Light of different parallax images can be separately incident on the left and right eyes of the observer. In this way, a stereoscopic image is perceived when an observer views the stereoscopic display device from a predetermined position and direction.

  In order to realize stereoscopic viewing, it is necessary to show different parallax images for the left eye and the right eye, so at least two parallax images are required. When three or more parallax images are used, multi-view viewing can be realized. As the number of parallax images increases, stereoscopic viewing according to changes in the viewpoint position of the observer can be realized. That is, motion parallax is obtained.

  Patent Documents 1 to 4 disclose an invention related to a stereoscopic display device for realizing stereoscopic viewing according to a change in the viewpoint position of an observer.

JP-A-8-327948 JP-A-10-153990 JP 2007-189489 A Japanese Unexamined Patent Publication No. 9-96778

  Here, a case where multi-view stereoscopic display is realized using four parallax images will be considered. In this case, the composite image displayed on the two-dimensional display panel includes striped divided images cut out from the first to fourth parallax images, for example, the first, second, third, and fourth parallax images. Are alternately and cyclically arranged in this order. And, for example, in the case of the parallax barrier method, by observing through the parallax barrier, only a specific parallax image in the left eye and the right eye can be seen when viewed from a specific viewpoint position. A stereoscopic image is perceived. For example, when viewed from a certain first viewpoint position, for example, only the third parallax image can be seen by the left eye and only the second parallax image can be seen by the right eye, so that a stereoscopic image is perceived. Is done. When viewed from another second viewpoint position, for example, only the first parallax image can be seen by the left eye and only the fourth parallax image can be seen by the right eye, so that a stereoscopic image is perceived. The Thus, motion parallax can be obtained by viewing different parallax images when viewed from different viewpoint positions. On the other hand, when viewed from a specific viewpoint position, light from a parallax image that does not contribute to stereoscopic vision is blocked by a parallax barrier. For example, when viewed from the first viewpoint position, the light from the first parallax image and the light from the fourth parallax image are shielded by the parallax barrier and are not recognized by the observer. That is, as long as the viewpoint position of the observer is at a specific position, there is light that is lost without being recognized by the observer when performing stereoscopic display. This light loss increases as the number of parallax images increases.

  Even when multi-lens stereoscopic display is performed by the lenticular method, the same light loss as in the above-described parallax barrier method occurs. In the case of the lenticular method, light is not blocked by the parallax barrier. However, when viewed from a specific viewpoint position, light from a parallax image that does not contribute to stereoscopic vision is emitted by being deflected in a direction different from the viewpoint position by the lenticular lens. That is, since light other than the parallax image that is stereoscopically viewed does not reach the observer's eyes, a light loss is actually generated.

  Such light loss also affects the power consumption of the two-dimensional display panel. That is, when multi-view stereoscopic display is performed by the above-described method, a composite image including all parallax image information is always displayed on the two-dimensional display panel regardless of whether or not the viewpoint position is moved. . However, as long as the viewpoint position of the observer is at a specific position, it is not necessary to display the information of the parallax image that does not contribute to stereoscopic vision, and wasteful display is performed. This is because, for example, when a self-luminous display panel is used as the two-dimensional display panel, pixels that do not contribute to stereoscopic vision are always emitted, and wasteful power is consumed. Become.

  Patent Documents 1 to 4 disclose inventions that perform various processes in accordance with changes in the viewpoint position of the observer when performing stereoscopic display. However, nothing is disclosed about a means for solving the problem of wasteful power consumption caused by light loss when performing multi-view stereoscopic display as described above.

  The present invention has been made in view of such problems, and an object thereof is to provide a stereoscopic display device and method capable of suppressing power consumption when performing multi-view stereoscopic display. .

  The stereoscopic display device according to the present invention generates a multi-view combined image by combining a two-dimensional display panel in which a plurality of pixels are two-dimensionally arranged and three or more parallax images for multi-view viewing. A signal processing unit that displays the viewpoint composite image on the two-dimensional display panel and each parallax image included in the multi-viewpoint composite image displayed on the two-dimensional display panel are optically separated so as to enable multi-view viewing. Separation means, detection means for detecting the viewpoint position of the observer, and a parallax image that is not recognized by the observer based on the detected viewpoint position, and is not recognized in the multi-viewpoint composite image by the signal processing unit And a display control unit that performs an image conversion process in which an image portion corresponding to a parallax image is converted into a predetermined image. Then, the display control unit is configured to perform an image conversion process that suppresses power consumption at pixels corresponding to the display position of the unrecognized parallax image on the two-dimensional display panel.

  In the stereoscopic display method according to the present invention, a signal processing unit generates a multi-view synthesized image by synthesizing three or more parallax images for multi-view viewing, and the plurality of pixels are two-dimensionally displayed. Are displayed on the two-dimensional display panel arranged on the two-dimensional display panel, and each parallax image included in the multi-view synthesized image displayed on the two-dimensional display panel is separated by an optical separation unit so that multi-view is possible. And a step of detecting the observer's viewpoint position by the detecting means, and a display controller that identifies a parallax image that is not recognized by the observer based on the detected viewpoint position, And a step of performing an image conversion process in which an image portion corresponding to an unrecognized parallax image in a multi-viewpoint composite image is converted into a predetermined image. Then, the display control unit is configured to perform an image conversion process that suppresses power consumption at pixels corresponding to the display position of the unrecognized parallax image on the two-dimensional display panel.

  In the stereoscopic display device or the stereoscopic display method according to the present invention, the viewpoint position of the observer is detected by the detecting unit, and the parallax image that is not recognized by the observer is specified by the display control unit based on the detected viewpoint position. The signal processing unit performs image conversion processing such that an image portion corresponding to an unrecognized parallax image in a multi-viewpoint composite image is converted into a predetermined image. This image conversion process is performed so that power consumption in the pixels corresponding to the display positions of the unrecognized parallax images on the two-dimensional display panel is suppressed. For example, when the two-dimensional display panel is a self-luminous display panel, power consumption required for light emission is suppressed by converting an image portion corresponding to a parallax image that is not recognized into a black image.

  According to the stereoscopic display device or method of the present invention, a parallax image that is not recognized by the observer is identified based on the viewpoint position of the viewer, and the pixel corresponding to the display position of the unrecognized parallax image on the two-dimensional display panel is used. Since the predetermined image conversion processing that suppresses the power consumption is performed, the power consumption when performing multi-view stereoscopic display can be suppressed.

1 is a block diagram illustrating a configuration of a stereoscopic display device according to a first embodiment of the present invention. It is a block diagram which shows the outline of a structure of the parallax barrier in the three-dimensional display apparatus which concerns on 1st Embodiment. It is explanatory drawing which shows the basic concept of the multi-view vision in the three-dimensional display apparatus which concerns on 1st Embodiment. FIG. 6 is an explanatory diagram illustrating a display state when a partial parallax image is converted into a black image based on a viewpoint position in the stereoscopic display device according to the first embodiment. FIG. 7 is an explanatory diagram illustrating a normal process of generating a multi-viewpoint composite image from a plurality of parallax images in the stereoscopic display device according to the first embodiment. FIG. 6 is an explanatory diagram illustrating a generation process of a multi-viewpoint composite image when a partial parallax image is converted into a black image based on the viewpoint position in the stereoscopic display device according to the first embodiment. It is a block diagram which shows the structure of the three-dimensional display apparatus which concerns on the 2nd Embodiment of this invention. FIG. 10 is an explanatory diagram illustrating a generation process of a multi-viewpoint composite image when a partial parallax image is converted into a black image based on a viewpoint position in the stereoscopic display device according to the second embodiment. It is a block diagram which shows the structural example of the lenticular lens in the three-dimensional display apparatus which concerns on 3rd Embodiment. It is explanatory drawing which shows the concept of the stereoscopic vision in the stereoscopic display apparatus which concerns on 3rd Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<First Embodiment>
[Configuration of stereoscopic display device]
FIG. 1 shows a configuration example of a stereoscopic display device according to the first embodiment of the present invention. This stereoscopic display device includes a two-dimensional display panel 2 and a parallax barrier 1 disposed so as to face the display surface side of the two-dimensional display panel 2. The stereoscopic display device also includes a signal processing unit 3, cameras 4 </ b> A and 4 </ b> B, a viewpoint position calculation unit 5, and a display control unit 6.

  In the present embodiment, the cameras 4A and 4B and the viewpoint position calculation unit 5 correspond to a specific example of “detection means” in the present invention. The parallax barrier 1 corresponds to a specific example of “separating means” in the present invention.

  The two-dimensional display panel 2 displays a two-dimensional image by arranging a plurality of pixels two-dimensionally. The two-dimensional display panel 2 displays a multi-viewpoint composite image output from the signal processing unit 3. The two-dimensional display panel 2 is a self-luminous display panel, for example, an organic EL (Electro-Luminescence) display. The two-dimensional display panel 2 can control the amount of light emission for each pixel, for example, by controlling the amount of current flowing through the light emitting element. Therefore, the power consumption is the lowest when black display is performed.

  The parallax barrier 1 is for optically separating the parallax images included in the multi-viewpoint composite image displayed on the two-dimensional display panel 2 so as to enable multiview viewing. As shown in FIGS. 2 to 4, the parallax barrier 1 includes a shielding portion 11 that shields display image light from the two-dimensional display panel 2 and a stripe shape that transmits display image light from the two-dimensional display panel 2. The slit portions 12 are provided alternately in the horizontal direction. The width of the slit portion 12 is appropriate so that when the observer views the stereoscopic display device from a predetermined position and a predetermined direction, different parallax image lights are separately incident on the left and right eyes of the observer. The size is set.

  The signal processing unit 3 generates a multi-view synthesized image by synthesizing N (N = an integer greater than or equal to 3) parallax images for multi-view viewing including information on different parallaxes. Is displayed on the two-dimensional display panel 2.

  The signal processing unit 3 includes an image dividing unit 31, an image combining unit 32, and a drive processing unit 33. The image dividing unit 31 performs a process of cutting out a plurality of stripe-like divided images extending in the vertical direction from the input parallax images for multiview viewing. The image synthesis unit 32 generates a multi-viewpoint synthesis image by alternately arranging the divided images output from the image division unit 31 in the horizontal direction for each parallax image. The drive processing unit 33 generates a driving signal for the 2D display panel 2 based on the multi-view combined image output from the image combining unit 32 and displays the multi-view combined image on the 2D display panel 2.

  The cameras 4A and 4B are, for example, CCD cameras (Charge Coupled Devices), and mainly photograph the face of the observer. The viewpoint position calculation unit 5 calculates the relative viewpoint position of the observer with respect to the parallax barrier 1 based on the photographing information of the cameras 4A and 4B. For example, the viewpoint position calculation unit 5 individually processes each image captured by the cameras 4A and 4B, and calculates the positions of the left eye and right eye of the observer in each image. Next, the positions of the left and right eyes of the observer are calculated from the positions of the eyes of the observer in the respective images and the characteristics and positional relationships of the two cameras 4A and 4B. In addition, the specific position detection method is not limited to the above-described method, and various conventionally known detection methods can be used.

  The display control unit 6 identifies parallax images that are not recognized by the observer in the multi-viewpoint composite image displayed on the two-dimensional display panel 2 based on the viewpoint positions detected by the cameras 4A and 4B and the viewpoint position calculation unit 5. It is supposed to be. The display control unit 6 also causes the signal processing unit 3 to perform an image conversion process in which an image portion corresponding to an unrecognized parallax image in a multi-viewpoint composite image is converted into a predetermined image. . This image conversion process is performed so that power consumption in the pixels corresponding to the display positions of the unrecognized parallax images in the two-dimensional display panel 2 is suppressed. Specifically, since the 2D display panel 2 consumes the least amount of power when performing black display as described above, the display control unit 6 performs image conversion processing such that a predetermined image is converted into a black image. To the signal processing unit 3. This black image conversion is performed when a multi-viewpoint composite image is generated in the image composition unit 32, as will be described later.

[Operation of stereoscopic display device]
A rough flow of the display operation of this stereoscopic display device will be described below.
(1) N parallax images for multi-view viewing are input to the image dividing unit 31, and a plurality of striped divided images extending in the vertical direction are cut out from each parallax image and output to the image combining unit 32. . The image composition unit 32 generates a multi-view composite image by arranging the divided images alternately in the horizontal direction for each parallax image.
(2) The drive processing unit 33 generates a drive signal for the two-dimensional display panel 2 based on the multi-view combined image output from the image combining unit 32 and causes the two-dimensional display panel 2 to display the multi-view combined image.
(3) In parallel with the processes (1) and (2), the camera 4A, 4B and the viewpoint position calculation unit 5 calculate the relative viewpoint position of the observer with respect to the parallax barrier 1.
(4) Based on the detected viewpoint position, the display control unit 6 specifies a parallax image that is not recognized by the observer in the multi-viewpoint composite image displayed on the two-dimensional display panel 2.
(5) The display control unit 6 performs an image conversion process on the signal processing unit 3 such that an image portion corresponding to the unrecognized parallax image in the multi-viewpoint composite image is converted into a predetermined image (black image). Make it.
(6) Returning to the process (1), the operations from the process (1) to the process (5) are repeated.
Note that the processing times of the processing (3) and the processing (4) may be thinned out with respect to the total number of iteration loops of the processing (1) to the processing (5).

  Hereinafter, specific examples of each process described above will be described with reference to the drawings. In the following description, it is assumed that there is only one observer.

  FIG. 5 schematically shows a process until the multi-viewpoint composite image is generated in the signal processing unit 3 (corresponding to the above process (1)). FIG. 5 shows an example using the first to fourth four parallax images. First to fourth parallax images as shown in the upper part of FIG. 5 are input to the image dividing unit 31. As shown in the middle part of FIG. 5, the image dividing unit 31 cuts out striped divided images from the first to fourth parallax images. In the image composition unit 32, the divided images are alternately arranged in the horizontal direction for each parallax image to generate a multi-viewpoint composite image as shown in the lower part of FIG. As a result, in the multi-view synthesized image, the stripe-shaped divided images cut out from the first to fourth parallax images are alternately arranged in the horizontal direction in the order of the first, second, third, and fourth parallax images. This is a composite image arranged in a circular pattern.

  FIG. 3 shows a state in which multi-view stereoscopic display is performed by displaying the multi-view combined image shown in FIG. 5 on the two-dimensional display panel 2 in this stereoscopic display device (the above processing ( 2)). In this stereoscopic display device, the multi-view synthesized image displayed on the two-dimensional display panel 2 is observed through the parallax barrier 1 so that the left eye 10L and the right eye are viewed from a specific viewpoint position. A stereoscopic image is perceived when only a specific parallax image at 10R is visible. For example, when viewed from the center first viewpoint position, only the light L3 from the third parallax image is recognized by the left eye 10L, and only the light L2 from the second parallax image is recognized by the right eye 10R. Therefore, a stereoscopic image based on the third parallax image and the second parallax image is perceived. When the viewpoint moves to the left and is viewed from the second viewpoint position, only the light L1 from the first parallax image is recognized by the left eye 10L, and the light L4 from the fourth parallax image is recognized by the right eye 10R. In this situation, only a stereoscopic image based on the first parallax image and the fourth parallax image is perceived.

  Thus, motion parallax can be obtained by viewing different parallax images when viewed from different viewpoint positions. On the other hand, when viewed from a specific viewpoint position, light from a parallax image that does not contribute to stereoscopic vision is shielded by the shielding unit 11 of the parallax barrier 1. For example, when viewed from the central first viewpoint position, the light L1 from the first parallax image and the light L4 from the fourth parallax image are shielded by the shielding unit 11 of the parallax barrier 1, and Not recognized. That is, as long as the viewpoint position of the observer is at a specific position, there is light that is lost without being recognized by the observer when performing stereoscopic display. The display control unit 6 identifies the parallax image that is not recognized by the observer based on the detected viewpoint position, and the image portion corresponding to the unrecognized parallax image is a black image for the signal processing unit 3. The image conversion process is performed such that the image is converted into the above (process (4), (5)).

  FIG. 6 shows a process of generating a multi-viewpoint composite image when a part of the parallax images is converted into a black image based on the viewpoint position (corresponding to the above process (5)). FIG. 6 shows an example in which the first parallax image and the fourth parallax image are specified as parallax images that are not recognized by the observer, and are converted into black images. The first to fourth parallax images are input to the image dividing unit 31, and the process of cutting out the stripe-shaped divided images therefrom is the same as in the example of FIG. 5 (upper stage in FIG. 6 and middle stage in FIG. 6). Next, the image composition unit 32 generates a multi-view composite image by alternately arranging the divided images in the horizontal direction for each parallax image. At this time, the first parallax image and the first parallax image that are not recognized by the observer are generated. The divided images corresponding to the four parallax images are converted into black images based on the control of the display control unit 6. As a result, the multi-viewpoint composite image is alternately displayed in the horizontal direction in the order of the black image converted from the first parallax image, the second and third parallax images, and the black image converted from the fourth parallax image. A synthesized image arranged in a circular manner is obtained (lower part of FIG. 6).

  FIG. 4 shows a state in which the multi-view combined image shown in FIG. 6 is displayed on the two-dimensional display panel 2 and stereoscopically displayed in this stereoscopic display device. On the two-dimensional display panel 2, a portion corresponding to the first parallax image and the fourth parallax image is converted into a black image and displayed. Even in such a display state, when viewed from the first first viewpoint position, only the light L3 from the third parallax image is recognized by the left eye 10L, and the second parallax is recognized by the right eye 10R. Only the light L2 from the image is recognized. Thereby, a stereoscopic image based on the third parallax image and the second parallax image is perceived.

  Similarly, when the viewpoint moves to the second viewpoint position on the left side, the third parallax image and the second parallax image may be converted into a black image. In this case, a stereoscopic image based on the first parallax image and the fourth parallax image is perceived at the second viewpoint position.

[Effects of First Embodiment]
According to the present embodiment, the parallax image that is not recognized by the observer based on the viewpoint position of the observer is specified, and the process of partially converting the multi-viewpoint synthesized image into the black image is performed. Power consumption in the case of performing multi-view stereoscopic display using a light-emitting display panel can be suppressed. A self-luminous display panel generally deteriorates in performance with the time for which a light emitting element emits light, and accordingly, the use time is limited and the life is long. According to the present embodiment, since the light emission time of the light emitting element is partially reduced, performance degradation can be suppressed as compared with the case where conversion to a black image is not performed, and the life of the stereoscopic display device can be extended.

  Further, according to the stereoscopic display device of the present embodiment, as a result, no light is emitted in directions other than the direction corresponding to the observer's viewpoint position, so that the screen can be made invisible to non-observers. For example, the image can be made invisible to other observers looking from the side. This also has the effect of improving personality and security.

<Second Embodiment>
Next, a stereoscopic display device according to a second embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the substantially same component as the three-dimensional display apparatus concerning the said 1st Embodiment, and description is abbreviate | omitted suitably.

  FIG. 7 shows a configuration example of the stereoscopic display device according to this embodiment. In the stereoscopic display device illustrated in FIG. 1, the display control unit 6 causes the image composition unit 32 of the signal processing unit 3 to perform conversion processing into a black image. That is, after a divided image is cut out from each parallax image, it is converted into a black image when it is combined. In contrast, in the stereoscopic display device according to the present embodiment, display control unit 6A causes image dividing unit 31 to perform image conversion processing. That is, when each parallax image for multi-view viewing is input to the image dividing unit 31, an image conversion process is performed such that a black image is input instead of a parallax image that is not recognized by the observer.

  FIG. 8 shows a generation process of a multi-viewpoint composite image when a part of the parallax images is converted into a black image based on the viewpoint position in the present embodiment (corresponding to the above process (5)). FIG. 8 shows an example in which the first parallax image and the fourth parallax image are specified as parallax images that are not recognized by the observer and are converted into black images, as in the case of FIG. 6. As shown in the upper part of FIG. 8, when the first to fourth parallax images are input to the image dividing unit 31, the first parallax image and the fourth parallax image are obtained based on the control of the display control unit 6. Convert to black image. In the image dividing unit 31, as shown in the middle of FIG. 8, the black image converted from the first parallax image, the second and third parallax images, and the black image converted from the fourth parallax image A striped divided image is cut out from each. In the image composition unit 32, the divided images are alternately arranged in the horizontal direction for each parallax image to generate a multi-viewpoint composite image as shown in the lower part of FIG. As a result, the multi-viewpoint composite image is a black image converted from the first parallax image, the second and third parallax images, and the black image converted from the fourth parallax image, as in the lower case of FIG. In this order, the combined images are alternately and cyclically arranged in the horizontal direction.

  Also in the present embodiment, the multi-view synthesized image that is finally output is the same as that in the first embodiment, and effects such as power saving similar to those in the first embodiment can be obtained. .

<Third Embodiment>
Next, a stereoscopic display device according to the third embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the substantially same component as the three-dimensional display apparatus concerning the said 1st or 2nd embodiment, and description is abbreviate | omitted suitably.

  In the first and second embodiments, an example of a parallax barrier type stereoscopic display device has been described. However, the present embodiment relates to a lenticular type stereoscopic display device. As shown in FIGS. 9 and 10, the stereoscopic display device according to the present embodiment uses a lenticular lens 1 </ b> A instead of the parallax barrier 1 as the “separation means” in the present invention. It is arranged opposite to the side. Except for the arrangement of the lenticular lens 1A, the configuration is the same as that of the stereoscopic display device according to the first or second embodiment.

  The lenticular lens 1A is formed by, for example, arranging a large number of cylindrical lenses (cylindrical lenses) 13 extending in the vertical direction and having refractive power only in the horizontal direction in the horizontal direction. The lens pitch of the cylindrical lens 13 is appropriately set according to the number of parallaxes to be displayed in multi-view. For example, when performing multi-view viewing with four parallaxes, four divided images with different parallaxes are set to correspond to one cylindrical lens 13. By setting in this way, the display image light from the two-dimensional display panel 2 is deflected and emitted in different directions for each parallax image.

  FIG. 10 shows a state in which multi-view stereoscopic display is performed by displaying the multi-view combined image shown in FIG. 5 on the two-dimensional display panel 2 in this stereoscopic display device (the above processing ( 2)). In this stereoscopic display device, the left-eye 10L and the right-eye 10R are viewed from a specific viewpoint position by observing the multi-viewpoint composite image displayed on the two-dimensional display panel 2 through the lenticular lens 1A. A stereoscopic image is perceived when only a specific parallax image is visible. FIG. 10 shows a state when viewed from the center first viewpoint position. In this case, only the light L3 from the third parallax image is recognized by the left eye 10L, and only the light L2 from the second parallax image is recognized by the right eye 10R. A stereoscopic image based on the parallax image and the second parallax image is perceived.

  Even when multi-lens stereoscopic display is performed by the lenticular method, the same light loss as in the parallax barrier method occurs. Although the illustration of the light beam is omitted in FIG. 10, for example, when viewed from the central first viewpoint position, the light from the first parallax image and the light from the fourth parallax image are viewed by the lenticular lens 1A. The light is deflected and emitted in a direction different from the position, and is not recognized by the observer. In the present embodiment, as in the first or second embodiment, a parallax image that is not recognized by the observer is identified based on the viewpoint position, and the signal processing unit 3 supports the parallax image that is not recognized. The image portion to be processed is converted into a black image.

  Also in the present embodiment, the multi-view synthesized image that is finally output is the same as that in the first embodiment, and effects such as power saving similar to those in the first embodiment can be obtained. .

<Fourth embodiment>
Next, a stereoscopic display device according to the third embodiment of the present invention will be described. Note that components that are substantially the same as those of the stereoscopic display device according to the first to third embodiments are denoted by the same reference numerals, and description thereof is omitted as appropriate.

  In each of the embodiments described above, the two-dimensional display panel 2 is described as a self-luminous display panel. However, the two-dimensional display panel 2 may be configured as a backlight type display panel. The backlight type display panel includes a backlight and a panel unit, and performs image display by modulating light from the backlight for each pixel in the panel unit.

  An example of such a backlight type display panel is a liquid crystal display. In a liquid crystal display, the panel portion includes a liquid crystal layer, and voltage is applied to the liquid crystal layer to change the alignment of liquid crystal molecules to modulate light. In a general liquid crystal display, the backlight is always lit, but the panel unit controls whether a voltage is applied to the liquid crystal layer for each pixel in accordance with an image to be displayed. Here, the liquid crystal display includes a normally black type and a normally white type as display types. The normally black type is a type in which black display is performed in a normal state where no voltage is applied to the liquid crystal layer, and white display is performed by applying a voltage to the liquid crystal layer. On the contrary, the normally white type is a type in which white display is performed in a normal state in which no voltage is applied to the liquid crystal layer, and black display is performed by applying a voltage to the liquid crystal layer. Here, for example, when a transistor element is used as a switching element for controlling whether to apply a voltage to the liquid crystal layer, a transistor element is driven when the transistor is turned on compared to an off state. A large amount of drive current is consumed.

  For this reason, the normally black type consumes less power in black display than in white display. On the other hand, in the normally white type, the power consumption for white display is smaller than that for displaying black. Therefore, when a normally black liquid crystal display is used as the two-dimensional display panel 2, the power consumption is suppressed by appropriately converting a parallax image that is not recognized by the observer into a black image, as in the above embodiments. be able to. On the other hand, when a normally white liquid crystal display is used, power consumption can be suppressed by converting to a white image instead of a black image. In this case, the display control operation is the same as in the above embodiments except that the image to be converted is a white image instead of a black image.

  As described above, according to the stereoscopic display device according to the present embodiment, it is possible to suppress power consumption when performing multi-view stereoscopic display using a backlight type display panel.

<Other embodiments>
The present invention is not limited to the above embodiments, and various modifications can be made.
For example, in each of the above embodiments, the case where there is one observer has been described, but the present invention is also applicable to a case where there are a plurality of observers. In this case, the viewpoint position detection means can detect the viewpoint positions of a plurality of observers. For example, the number of cameras 4A and 4B installed is increased, and the image recognition program in the viewpoint position calculation unit 5 is an algorithm that can calculate the viewpoints of a plurality of observers. The display controllers 6 and 6A may specify a parallax image that is not recognized by any of the plurality of observers based on the detected viewpoint positions of the plurality of observers. Then, it is only necessary to cause the signal processing unit 3 to perform an image conversion process in which an image portion corresponding to the unrecognized parallax image is converted into a predetermined image.

  DESCRIPTION OF SYMBOLS 1 ... Parallax barrier, 1A ... Lenticular lens, 2 ... Two-dimensional display panel, 3 ... Signal processing part, 4A, 4B ... Camera, 5 ... Viewpoint position calculation part, 6, 6A ... Display control part, 10L ... Left eye, 10R ... right eye, 11 ... shielding part, 12 ... slit part, 13 ... cylindrical lens, 31 ... image dividing part, 32 ... image composition part, 33 ... drive processing part.

Claims (9)

A two-dimensional display panel in which a plurality of pixels are two-dimensionally arranged;
A signal processing unit that generates a multi-view combined image by combining three or more parallax images for multi-view, and displays the multi-view combined image on the two-dimensional display panel;
Separating means for optically separating the parallax images included in the multi-view combined image displayed on the two-dimensional display panel so as to enable multi-view viewing;
Detection means for detecting the viewpoint position of the observer;
Based on the detected viewpoint position, a parallax image that is not recognized by an observer is specified, and an image portion corresponding to the unrecognized parallax image in the multi-viewpoint composite image is determined as a predetermined image for the signal processing unit. A display control unit that performs image conversion processing to be converted,
The three-dimensional display device, wherein the display control unit performs an image conversion process that suppresses power consumption at pixels corresponding to a display position of the unrecognized parallax image on the two-dimensional display panel. The signal processing unit
An image dividing unit that performs a process of cutting out a plurality of stripe-shaped divided images extending in the vertical direction from each input multi-view parallax image;
An image composition unit that alternately arranges the divided images in the horizontal direction for each parallax image to generate the multi-viewpoint composite image;
A drive processing unit that generates a drive signal for the two-dimensional display panel based on the multi-view combined image output from the image combining unit;
The display control unit causes image conversion processing such that an image portion corresponding to the unrecognized parallax image is converted into a predetermined image when the image synthesis unit generates the multi-viewpoint synthesized image. The stereoscopic display device according to claim 1, wherein the stereoscopic display device is made. The signal processing unit
An image dividing unit that performs a process of cutting out a plurality of stripe-shaped divided images extending in the vertical direction from each input multi-view parallax image;
An image composition unit that alternately arranges the divided images in the horizontal direction for each parallax image to generate the multi-viewpoint composite image;
A drive processing unit that generates a drive signal for the two-dimensional display panel based on the multi-view combined image output from the image combining unit;
The display control unit causes the image dividing unit to perform an image conversion process in which the predetermined image is input instead of the unrecognized parallax image when the parallax images for multi-view viewing are input. The stereoscopic display device according to claim 1, which is configured as described above. The detection means is capable of detecting each viewpoint position of a plurality of observers,
The display control unit identifies a parallax image that is not recognized by any of the plurality of viewers based on the detected viewpoint positions of the plurality of viewers, and an image portion corresponding to the parallax image that is not recognized is predetermined. The stereoscopic display device according to any one of claims 1 to 3, wherein an image conversion process is performed such that the image is converted into an image. The two-dimensional display panel is a self-luminous display panel,
4. The display control unit according to claim 1, wherein the display control unit is configured to perform an image conversion process in which an image portion corresponding to the unrecognized parallax image is converted into a black image as the predetermined image. Item 3. A stereoscopic display device according to item 1. The two-dimensional display panel includes a backlight and a panel unit, and a normally black type or a normally white type display panel that displays an image by modulating light from the backlight for each pixel in the panel unit. And
The display control unit performs image conversion processing such that when the two-dimensional display panel is a normally black type, an image portion corresponding to the unrecognized parallax image is converted into a black image as the predetermined image. 4. The stereoscopic display according to claim 1, wherein in the case of a normally white type, an image conversion process is performed so that the predetermined image is converted into a white image. 5. apparatus. The separation means is provided with shielding portions that shield display image light from the two-dimensional display panel and stripe-shaped slit portions that transmit display image light from the two-dimensional display panel alternately in the horizontal direction. The stereoscopic display device according to claim 1, wherein the stereoscopic display device is a parallax barrier. 4. The stereoscopic display device according to claim 1, wherein the separating unit is a lenticular lens that deflects and emits display image light from the two-dimensional display panel in different directions for each parallax image. 5. . A two-dimensional display panel in which a multi-view synthesized image is generated by synthesizing three or more parallax images for multi-view viewing by a signal processing unit, and a plurality of pixels are two-dimensionally arranged on the multi-view synthesized image Steps to display
Separating each parallax image included in the multi-view combined image displayed on the two-dimensional display panel by an optical separation unit so as to enable multi-view viewing;
Detecting the observer's viewpoint position by a detecting means;
A display control unit identifies a parallax image that is not recognized by an observer based on the detected viewpoint position, and an image portion corresponding to the unrecognized parallax image in the multi-viewpoint composite image is provided to the signal processing unit. An image conversion process for converting the image into a predetermined image, and
A stereoscopic display method in which the display control unit performs an image conversion process that suppresses power consumption at pixels corresponding to a display position of the unrecognized parallax image on the two-dimensional display panel.

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