JP2012063724A - Stereoscopic image display device and stereoscopic vision confirmation sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stereoscopic image display device and a stereoscopic vision confirmation sheet by which an observer can be informed that his/her position is deviated from a correct observation position.SOLUTION: According to an embodiment, a naked-eye stereoscopic image display device displays such an image that is perceived as an intended stereoscopic image when observed from a prescribed observation position, and is perceived as a false stereoscopic image when observed from a position other than the prescribed observation position. In the stereoscopic image display device, a sheet member is attached to a front surface of a screen, and the sheet member is configured to indicate a prescribed message when observed from a position other than the prescribed observation position.

Description

  Embodiments described herein relate generally to a naked-eye stereoscopic image display device and a stereoscopic confirmation sheet.

  Autostereoscopic display technology that can perceive stereoscopic images without using special glasses can be classified in various ways, but in general, binocular parallax using binocular parallax and actually forming aerial images And aerial image reproduction method.

  The binocular parallax system is classified into a binocular system and a multi-lens system. In the twin-lens system, an image for the left eye and an image for the right eye, which are obtained by setting the photographing positions to two positions corresponding to the left eye and the right eye, can be seen by the left eye and the right eye, respectively. This is the method. The multi-view method is a method in which the amount of information is increased by using a plurality of observation positions at the time of video shooting, and the range that can be observed is expanded.

  The aerial image reproduction method is classified into a holography method and an integral photography method (hereinafter referred to as an integral method, but also referred to as a light ray reproduction method). Although the integral method may be classified as a binocular parallax method, the light path follows exactly the opposite path between shooting and playback, so the number of rays can be increased sufficiently and the pixel size can be reduced sufficiently. In this case, since a complete stereoscopic image is reproduced, the ideal integral method is classified as an aerial image reproduction method.

  By the way, in order to perceive a stereoscopic image without glasses like the multi-view type or the integral type, the following configuration is usually adopted. A plurality of two-dimensional image display pixels arranged two-dimensionally constitute individual stereoscopic image display pixels, and a mask having a function of controlling light rays from the stereoscopic image display pixels on the front side thereof (also called a light beam control element) Place). The mask is provided with a window portion that is much smaller than the stereoscopic image display pixel (typically substantially the same size as the two-dimensional image display pixel) at a position corresponding to the stereoscopic image display pixel. As the mask, a fly-eye lens in which minute lenses are two-dimensionally arranged, a lenticular sheet having a shape in which optical apertures extend linearly in the vertical direction and are periodically arranged in the horizontal direction, or slits are also used. .

  According to such a configuration, the element images displayed by the individual stereoscopic image display pixels are partially blocked by the mask, and the observer visually recognizes only those transmitted through the window. Therefore, the two-dimensional image display pixels visually recognized through a certain window can be made different for each observation position, and a stereoscopic image can be perceived without using glasses.

  However, when this configuration is adopted, an original stereoscopic image, that is, a true stereoscopic image is perceived when observed from the correct position, but a pseudo stereoscopic image is perceived when the observation position is shifted. This is because, when the observation position is shifted, on the wide viewing angle side, a part of the element image displayed by the adjacent stereoscopic image display pixel is visually recognized from the window portion facing a certain stereoscopic image display pixel. Because. In this case, it is difficult for the observer to distinguish whether the perceived stereoscopic image is a true stereoscopic image or a pseudo stereoscopic image.

JP-A-10-215466 JP 2009-294405 A

  In a conventional autostereoscopic display device, there is a problem that it is difficult for an observer to recognize whether or not a true stereoscopic image is perceived.

  An object of the present invention is to provide a stereoscopic image display device capable of notifying an observer whether or not a true stereoscopic image is perceived.

  Another object of the present invention is to provide a stereoscopic confirmation sheet that can inform an observer whether or not a true stereoscopic image is perceived.

  According to the embodiment, in the naked-eye type stereoscopic image display device that displays an image that is perceived as an original stereoscopic image when observed from a predetermined observation position and perceived as a false stereoscopic image when observed from other than the predetermined observation position. A sheet member is attached to the front surface of the screen, and the sheet member is configured to present a predetermined message when observed from other than the predetermined observation position.

It is a figure which shows the outline of the three-dimensional image display apparatus which concerns on embodiment. It is a figure which shows the example which implement | achieved the apparatus of FIG. 1 with the liquid crystal display device. It is a figure which shows the relationship between a stereoscopic image display apparatus and an observation position, and the image perceived in each observation position. It is a front view of the three-dimensional image display device concerning an embodiment. It is a figure which shows an example of the display of the relationship between a stereoscopic image display apparatus and an observation position, and the stereoscopic vision confirmation sheet observed at each observation position. It is a figure which shows the other example of a display of the stereoscopic vision confirmation sheet | seat observed at each observation position of a stereoscopic image display apparatus. It is a figure which shows the further another example of a display of the stereoscopic vision confirmation sheet | seat observed in each observation position of a stereoscopic image display apparatus.

  Hereinafter, embodiments will be described with reference to the drawings.

  First, the principle of stereoscopic image display will be described. FIG. 1 is a cross-sectional view schematically illustrating an example of a stereoscopic image display apparatus according to the embodiment. The embodiment describes an example of stereoscopic viewing by the integral method, but the stereoscopic viewing method is not limited to the integral method, and any naked eye method may be used. The stereoscopic image display device 1 shown in FIG. 1 includes a large number of stereoscopic image display pixels 11 arranged vertically and horizontally, and a large number of windows 22 that are spaced apart from them and corresponding to the stereoscopic image display pixels 11. And a mask device 20. The mask device 20 has an optical aperture, has a function of controlling light rays from the pixels, and is also called a parallax barrier or a light ray control element. The mask device 20 has a light shielding body pattern having a large number of openings corresponding to a large number of windows 22 on a transparent substrate, or a light shielding plate provided with a large number of through holes corresponding to a large number of windows 22. Can be used. Alternatively, as another example of the mask device 20, a fly-eye lens in which a large number of minute lenses are two-dimensionally arranged, an optical aperture extends linearly in the vertical direction, and is periodically arranged in the horizontal direction. Shaped lenticular lenses can also be used. Furthermore, as the mask device 20, a device that can arbitrarily change the arrangement, size, shape, and the like of the window portion 22, such as a transmissive liquid crystal display device, may be used.

  In the case of stereoscopic viewing of a still image, the stereoscopic image display pixel 11 may be paper on which an image is printed. However, in order to stereoscopically view a moving image, the stereoscopic image display pixel 11 is realized using a liquid crystal display device. An example cross-sectional view is shown in FIG. In FIG. 2, a large number of pixels of the transmissive liquid crystal display device 10 constitute a large number of stereoscopic image display pixels 11, and a backlight 30 which is a surface light source is disposed on the back side of the liquid crystal display device 10. A mask device 20 is disposed on the front side of the liquid crystal display device 10.

  When the transmissive liquid crystal display device 10 is used, the mask device 20 may be disposed between the backlight 30 and the liquid crystal display device 10. Instead of the liquid crystal display device 10 and the backlight 30, a self-luminous display device such as an organic EL (electroluminescence) display device, a cathode ray tube display device, or a plasma display device may be used. In that case, the mask device 20 is disposed on the front side of the self-luminous display device.

  FIG. 3A is a diagram schematically showing the relationship between the stereoscopic image display device 1 shown in FIG. 1 and the observation positions A, B1, B2,. The observation position is a position translated in the horizontal direction of the display screen while maintaining a constant distance from the screen (or mask device). FIG. 3B is a diagram schematically showing a stereoscopic image perceived when observed from the observation positions A, B1, B2,... Shown in FIG. In FIG. 3A, a broken line 51 is a straight line connecting the boundary between adjacent stereoscopic image display pixels 11 and the window portion 22 of the mask device 20. In FIG. 3A, a broken line 52 indicates a boundary between the observation positions B1 and B2 where only a true stereoscopic image (original stereoscopic image) is perceived and the observation positions C1 and C2 where a false stereoscopic image is perceived. An area surrounded by two broken lines 52 corresponds to an observation position where only a true stereoscopic image is perceived. Hereinafter, an observation position where only a true stereoscopic image is perceived is referred to as a “viewing zone”.

  The light beam emitted from the stereoscopic image display pixel 11 passes not only the light beam in a predetermined direction that passes only through the window portion 22 of the mask device 20 that is supposed to pass through, but also the other, particularly, adjacent window portions. It also includes unwanted rays. Since the undesired ray is a ray that is not necessary for the true stereoscopic image that should be perceived originally, it interferes with the perception of the true stereoscopic image, and at the same time, the unwanted ray is different from the true stereoscopic image. Make a 3D image perceived. Although the pseudo stereoscopic image is similar to the true stereoscopic image, the pseudo stereoscopic image is usually perceived as a distorted image reflecting the deviation of the design value. Further, when an undesired light ray impedes the perception of a true stereoscopic image, a true stereoscopic image and a false stereoscopic image are perceived in a mixed manner.

  As shown in FIG. 3B, only the true stereoscopic image 61a is perceived at the observation positions A, B1, and B2. Even when observed in these viewing zones, the appearance of the true stereoscopic image 61a changes depending on the observation position.

  At the observation positions C1, C2, D1, and D2, a mixed image of the true stereoscopic image 61a and the pseudo stereoscopic image 61b is perceived. The ratio of the pseudo stereoscopic image 61b in the perceived mixed image becomes larger as the wide viewing angle side.

  At the observation positions E1 and E2, a part of the element image displayed by the adjacent stereoscopic image display pixel 11 is observed for all the window portions 22, and therefore only the pseudo stereoscopic image 61b is perceived. The pseudo stereoscopic image 61b has a depth direction opposite to that of the true stereoscopic image 61b. A stereoscopic image including the pseudo stereoscopic image 61b (perceived at the observation positions C1, C2, D1, D2, E1, and E2) is also referred to as a reverse view image, and a true stereoscopic image 61a (perceived at the observation positions A, B1, and B2). Is also referred to as a normal image.

  The above description relates to the case where the observation position is translated in the horizontal direction of the display screen. Similarly, even when the observation position is translated in the vertical direction of the display screen, the true / false of the stereoscopic image changes depending on the observation position. . However, when a lenticular lens or a slit extending in the vertical direction of the screen is used as the mask device 20, the perceived stereoscopic image does not change even if the observation position is moved in the vertical direction. This is because such a mask device 20 realizes stereoscopic viewing using only horizontal parallax. When the mask device 20 in which the fly-eye lens and the opening are two-dimensionally arranged is used, stereoscopic vision is realized using parallax in both horizontal and vertical directions. In addition, when the observation position is moved in the distance direction orthogonal to the screen, or when the parallel movement and the movement in the distance direction are mixed, or the distance to the screen is unchanged, the circle is centered on the center of the screen. Similarly, the true / false of the stereoscopic image changes according to the observation position. However, it is difficult for the observer to identify the authenticity of the stereoscopic image.

  As described above, in the autostereoscopic display device, when an observer moves outside the limited viewing area, a reverse viewing image (including a pseudo stereoscopic image) is perceived. That is, in the naked-eye type stereoscopic image display device, the perceived image differs depending on the observation position. The position at which the observer perceives the normal image and the position at which the reverse image is perceived are specific to the display device (screen size, principle of stereoscopic vision, etc.) and can be obtained in advance. A stereoscopic image of a sticker or sheet configured to present to a viewer a message composed of characters, symbols, marks, etc. that differ depending on the observation position in conjunction with the position dependency of the perceived image of such a stereoscopic image display device. By providing it on the screen surface of the display device, it is possible to inform the observer of whether it is within the viewing zone or deviated from the viewing zone.

  According to the embodiment, as shown in FIG. 4, the stereoscopic vision confirmation sheet 72 is attached to the frame (upper or lower horizontal frame) of the screen of the stereoscopic image display device 1. The sheet 72 is configured similarly to the stereoscopic image display apparatus 1 shown in FIG. A stereoscopic image display pixel is formed on paper or a plastic sheet, and a mask device is arranged thereon. However, the stereoscopic image display pixel is not a pixel for displaying a stereoscopic image, but a pixel for displaying a two-dimensional still image that presents a mark or a character. The sheet 72 may be configured as a sticker that is attached to the frame body by the manufacturer after the display device is manufactured, before shipping, or the like, or is printed and embedded directly in the frame body or a part of the screen (upper and lower ends). It may be formed directly by such a method.

  As in the stereoscopic image display device 1, the sheet 72 presents different images depending on the position of the observer as shown in FIG. No alert is presented at the observation positions A, B1, B2 where only the true stereoscopic image 61a is perceived. In other observation positions C1, C2, D1, D2, E1, and E2, the characters “reverse view” and an arrow are presented. Note that when the stereoscopic image display device 1 is observed from an observation position outside the viewing area, the stereoscopic image is perceived as a stereoscopic image that is distorted or has an uneven surface, but from which position the sheet 72 (two-dimensional still image display pixel) is observed. Even in such a case, it is configured to present clear characters and marks without distortion. An arrow indicates a deviation from the viewing area (in other words, a direction and a distance in which the observation position is moved to return to the viewing area), and the observation positions C1, D1, and E1 that are shifted to the right side of the viewing area face leftward and to the left. The shifted observation positions C2, D2, and E2 are directed to the right. The lengths of the arrows are the shortest at the observation positions C1 and C2 closest to the viewing area, and the longest at the observation positions E1 and E2 farthest from the viewing area.

  Thus, when no character is presented on the sheet, the observer can recognize that the observation position is within the viewing zone and that the perceived stereoscopic image is a true stereoscopic image. When characters are presented on the sheet, the observation position is deviated from the viewing area, and it can be recognized that the perceived stereoscopic image is other than a true stereoscopic image. Further, from the direction and length of the arrow, it is also possible to recognize how much the observer should move in order to return the observation position to the viewing zone. For this reason, the observer can easily know the true / false of the perceived stereoscopic image, and in the case of false, the observer can easily return the observation position to the viewing area so that the true stereoscopic image can be perceived. Therefore, a true stereoscopic image can always be perceived.

  Note that the image displayed on the sheet shown in FIG. 5 is merely an example, and any image may be used as long as the change state of how the observer perceives the stereoscopic image displayed on the stereoscopic image display device can be presented. For example, only the characters in FIG. 5 or only the arrows may be used. Alternatively, the degree of deviation may be expressed by changing the color as it deviates from the viewing zone.

  In FIG. 6, the viewing zones (observation positions A, B1, and B2) are not displayed, and at the other observation positions, at least a part of the characters “reverse view image” and an arrow having the same length and direction as those in FIG. An example of display is shown. Since the screen is viewed from an oblique angle as the distance from the viewing zone increases, the end of the character is difficult to see, and accordingly, a part of the reverse-viewed character is not displayed.

  In FIG. 7, the viewing zones (observation positions A, B1, and B2) are not displayed, and at other observation positions, a vertical line is formed at the boundary between the true stereoscopic image and the pseudo stereoscopic image, and the length and direction are the same as those in FIG. An example of displaying an arrow is shown.

  The same effect as in FIG. 5 can be obtained by the sheets that display as shown in FIGS.

  The directions of the arrows in FIGS. 5, 6, and 7 are based on the assumption that the display device is fixed and the observer moves. In the case of a portable stereoscopic image display device such as a game machine, Since the machine side is often moved to match the position of the viewing zone and the observer's eyes, in this case, the direction in which the display device is moved is indicated.

  The stereoscopic vision confirmation sheet 72 has the same structure as that of the stereoscopic image display device, but does not have to be the same structure. What is required of the stereoscopic vision confirmation sheet 72 is that the visible contents change depending on the viewing position and viewing direction, and if the viewer's position is outside the viewing area of the stereoscopic image display device, it is only necessary to be able to present warning content. . For example, you may use the Lippmann type hologram from which the content displayed changes with viewing directions.

  The stereoscopic confirmation sheet 72 warns of a deviation in the observation position in the horizontal direction from the viewing area. However, in the case of stereoscopic vision that also uses vertical parallax, it warns of a deviation in the observation position in the vertical direction from the viewing area. May be. In that case, the sheet 72 is pasted on the right or left lateral frame of the frame of the screen.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Stereoscopic image display device, 10 ... Liquid crystal display device, 11 ... Stereoscopic image display pixel, 20 ... Mask device, 22 ... Window part, 30 ... Backlight, 72 ... Stereoscopic confirmation sheet.

Claims (16)

In an autostereoscopic image display device that displays an image that is perceived as an original stereoscopic image when observed from a predetermined observation position and is perceived as a false stereoscopic image when observed from other than the predetermined observation position,
A stereoscopic image display device, wherein a sheet member is provided on a front surface of the screen, and the sheet member is configured to present a predetermined message when observed from a position other than the predetermined observation position. The stereoscopic image display apparatus according to claim 1, wherein the predetermined message tells an observer that the perceived stereoscopic image is a pseudo stereoscopic image. The stereoscopic image display apparatus according to claim 1, wherein the predetermined message includes guidance for moving an observation position to the predetermined observation position. 4. The stereoscopic image display device according to claim 1, wherein the predetermined message includes at least one of a character, an arrow, a mark, and a symbol. 5. The stereoscopic image display apparatus according to claim 1, wherein the sheet member does not present a message when observed from the predetermined observation position. The sheet member has a base on which pixels configured to show different contents according to an observation position, a light control element array disposed on the base and controlling light from the pixels, The stereoscopic image display device according to claim 1, comprising: 7. The stereoscopic image display device according to claim 6, wherein the light beam control element array comprises a lenticular lens array, a light shielding plate having a large number of through holes or openings, or a fly-eye lens in which a large number of minute lenses are two-dimensionally arranged. . The stereoscopic image display device according to claim 1, wherein the sheet member is attached to a front surface of a screen frame of the stereoscopic image display device. The stereoscopic image display device according to claim 1, wherein the sheet member is integrally formed on a front surface of the stereoscopic image display device. The stereoscopic image display device according to claim 1, wherein the sheet member is a sticker attached to a front surface of a screen frame of the stereoscopic image display device. A stereoscopic confirmation sheet for a naked-eye stereoscopic image display device that displays an image that is perceived as an original stereoscopic image when observed from a predetermined observation position and perceived as a false stereoscopic image when observed from other than a predetermined observation position. A stereoscopic confirmation sheet configured to present a predetermined message when observed from a position other than the predetermined observation position when attached to the stereoscopic image display device. The stereoscopic vision confirmation sheet according to claim 11, wherein the predetermined message tells a viewer that the perceived stereoscopic image is a false stereoscopic image. The stereoscopic vision confirmation sheet according to claim 11, wherein the predetermined message includes guidance for moving an observation position to the predetermined observation position. The stereoscopic vision confirmation sheet according to claim 11, wherein the predetermined message includes at least one of a character, an arrow, a mark, and a symbol. Claims comprising: a base material on which pixels configured to show different contents according to an observation position are arranged; and a light beam control element array that is disposed on the base material and controls light rays from the pixels. Item 13. A stereoscopic confirmation sheet according to Item 11. 16. The stereoscopic vision confirmation sheet according to claim 15, wherein the light beam control element array comprises a lenticular lens array, a light shielding plate having a large number of through holes or openings, or a fly-eye lens in which a large number of minute lenses are two-dimensionally arranged. .

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