JP2008058583A - Three-dimensional image display device and three-dimensional image display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-dimensional image display device capable of widening a view angle while excluding cross talk, and to provide a three-dimensional display method. <P>SOLUTION: The three-dimensional display device is provided with: a display device 10 composed of a plurality of element image display parts displaying element images; a lenticular lens sheet 20 arranged in a direction of an optical beam of a two-dimensional display means and composed of a plurality of element lenses passing the optical beam of the element image display part; an element pixel image element lens correspondence change means 30 for changing the correspondence of the element image display part and the element lenses passing the optical beam from the element image display part; and a time division synchronous image display means 40 for instructing change to the element image element lens correspondence change means and making the element image display part display the element images by time division by being synchronized with the instruction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a three-dimensional image display device and a three-dimensional image display method.

  In recent years, with the increase in resolution of display devices, improvement in computational capabilities, and advances in digital signal technology, an environment that can realize a naked-eye three-dimensional image display system is being established at a relatively low cost, and a parallax barrier has already been used. Mobile phones and personal computers with a 3D image display function have been commercialized. However, with the twin-lens method used in these products, it is necessary to view the image from a fixed position. For stereoscopic viewing, the number of observers is limited to one person, and the position is limited. , There was a drawback.

  Among the methods for displaying a naked-eye three-dimensional image, Integral Photography (IP), invented by Lippmann in 1908, is considered to be one of the leading methods for solving the above-mentioned drawbacks. This method has the feature that a plurality of observers can observe at the same time, and if the observation position changes, the appearance changes accordingly. The IP method presented by Lippmann was a method using a moth-eye lens that reproduces the parallax in the horizontal and vertical directions, but considering the feasibility and human perception characteristics, using a lenticular lens etc. A one-dimensional IP method that reproduces only the parallax is also proposed.

  In the conventional IP method using a lenticular lens sheet, as shown in FIG. 15, element image display units 14 and 15 formed of a plurality of pixels on the display device 10 are individual lenses of the lenticular lens sheet 20. The element lenses 24 and 25 are fixedly associated with each other (in FIG. 15, the correspondence is indicated by dotted lines). When the element image is displayed on the element image display units 14 and 15 of the display device, the image is emitted in a predetermined direction based on the fixed positional relationship between the element image display units 14 and 15 and the element lens. The observer recognizes this as a three-dimensional image by looking at this image according to the position of the eyes.

  On the other hand, the definition and viewing zone angle of a 3D image in the IP system are in a trade-off relationship. In a display device such as a liquid crystal display or projector, priority is given to the definition and the viewing angle (viewing zone angle) is narrow. There were many. Further, in the IP system, crosstalk that is not intended by the system provider may occur from the adjacent element image display unit adjacent to the element image display unit corresponding to the element lens.

  The range of the viewing angle of the conventional IP method can be expressed by (Equation 1). Here, g is the distance between the lens array and the image display device, and p is the lateral width (pitch) of the element lenses of the lens array. In general, the distance g between the display device and the element lens is set equal to the focal length of the element lens. In this case, (Equation 1) can be expressed as (Equation 2). Further, the pitch p of the element lenses cannot be increased without increasing the resolution of the two-dimensional display device. Thus, p and g are determined depending on the entire display device system, and cannot be changed freely.

θ = 2 arctan (p / (2 × g)) (Equation 1)
θ = 2 arctan (p / (2 × f)) (Equation 2)
In order to increase the viewing zone angle, for example, as shown in FIGS. 16A and 16B, there is a method of shortening the focal length of the element lens (f1> f2). When the focal length is shortened, the viewing zone angle itself increases (θ1 <θ2), but the number of pixels X of the element image corresponding to one lens does not change unless the total number of pixels of the two-dimensional display device is changed. For this reason, the density of pixels per unit angle becomes low (X / θ1> X / θ2), and the image that should be continuously viewed becomes discontinuous, which causes a feeling of strangeness when the observer observes. In addition, since a lens having a short focal length has a large influence of aberration, there is a limit to shortening the focal length of the lens.

  As a method of avoiding crosstalk, a method of providing a shielding unit and shielding light from an adjacent image is disclosed (for example, Patent Document 1 below). However, in this method, the viewing zone angle remains unchanged.

Further, as a method for avoiding crosstalk and widening the viewing zone angle, the following (Patent Document 2) discloses a method in which an element lens is provided with an opening / closing portion and the element lens to be opened / closed is switched. In this method, a lens adjacent to an open element lens is closed to shield a reproduced image (crosstalk) from the adjacent element lens. Further, by switching the element lenses to be opened and closed at a constant cycle, it seems that images corresponding to all the element lenses are reproduced at the same time, thereby widening the viewing zone angle.
JP 2002-300599 A JP 2003-177355 A

  However, according to the conventional technique of the above (Patent Document 2), the pixels of the display device corresponding to all the element lenses including the closed element lens are required, and the display device becomes large-scale. Further, since the open / close portions are provided in all the element lenses, there is a problem that the number of movable portions is large and the control thereof is complicated.

  The present invention has been made in view of the above, and provides a three-dimensional image display device and a three-dimensional image display method capable of widening the viewing zone angle with a simple configuration and eliminating crosstalk. Objective.

  In order to solve the above-described problems, the present invention provides a two-dimensional display unit composed of a plurality of element image display units for displaying an element image, and is arranged in the light beam direction of the two-dimensional display unit. A lens array composed of a plurality of element lenses that allow light rays to pass through; an element image element lens correspondence switching unit that switches correspondence between the element image display unit and an element lens that transmits light rays from the element image display unit; and Time-division synchronized image display means for instructing switching to the element image element lens correspondence switching means and displaying the element image in a time-division manner on the element image display unit in synchronization with the instruction.

  According to the present invention, it is possible to obtain a three-dimensional image display apparatus and a three-dimensional image display method that can widen the viewing zone angle while eliminating crosstalk with a simple configuration.

  A three-dimensional image display device according to a first aspect of the present invention includes a two-dimensional display unit composed of a plurality of element image display units for displaying an element image, and an element image display arranged in the light beam direction of the two-dimensional display unit. Element image element lens correspondence switching means for switching correspondence between a lens array composed of a plurality of element lenses that allow light rays of a part to pass, and an element image display part and an element lens that allows light rays from the element image display part to pass therethrough, Instructed to switch to the element image element lens correspondence switching means, characterized by comprising time-division synchronized image display means for displaying the element image in a time-division manner on the element image display unit in synchronization with the instruction, This has the effect of widening the viewing zone angle while eliminating crosstalk.

  The three-dimensional image display device according to the second aspect of the present invention is characterized in that the two-dimensional display means is a projection type display means, and widens the viewing zone angle while eliminating crosstalk. Has the effect of being able to

  A three-dimensional image display apparatus according to a third aspect of the present invention is characterized in that the element image element lens correspondence switching means is an optical path changing means, and the viewing zone angle is set while eliminating crosstalk. It has the effect that it can be spread.

  The three-dimensional image display device according to the fourth aspect of the present invention is characterized in that the element image element lens correspondence switching means is a wavelength selection filter, and widens the viewing zone angle while eliminating crosstalk. It has the effect of being able to.

  The three-dimensional image display device according to the fifth aspect of the present invention is characterized in that the element image element lens correspondence switching means is a polarization filter, and widens the viewing zone angle while eliminating crosstalk. Has the effect of being able to

  In the three-dimensional image display device according to the sixth aspect of the present invention, the number of divisions when the element image is displayed in the element image display unit in a time division manner and the number of switching stages of the element image element lens correspondence switching means are equalized And has the effect of widening the viewing zone angle while eliminating crosstalk.

  In the three-dimensional image display device according to the seventh aspect of the present invention, the viewing zone angle θ of the three-dimensional image is “θ> 2 arctan (p / (2g)): p is the pitch of the element lens, and g is the two-dimensional display device. And the lens array distance ”, and has the effect of widening the viewing zone angle while eliminating crosstalk.

  A three-dimensional image display method according to an eighth aspect of the present invention displays a plurality of element images and projects a three-dimensional image through a lens array composed of element lenses corresponding to the element images. An image display step for displaying a plurality of element images on an element image display unit, and a switching instruction step for instructing switching between the element image display unit and an element lens corresponding to the element image display unit. An element image element lens correspondence switching step for switching the correspondence between the element image display unit and the element lens based on the instruction, the image display step, the switching instruction step, and the element image element lens correspondence switching step. It is characterized in that it is executed repeatedly for the number of switching stages corresponding to the, and the viewing angle is widened while eliminating crosstalk. It has the effect that it is Rukoto.

  Embodiments of the present invention will be described below.

(Embodiment 1)
FIG. 1 is a component diagram of the first embodiment. The three-dimensional image display device according to the present embodiment includes a display device 10, a lenticular lens sheet 20, an element image element lens correspondence switching unit 30, and a time-division synchronized image display unit 40. The lenticular lens sheet 20 is composed of a plurality of element lenses (for example, 23, 24, 25), and the display device 10 is composed of a plurality of element image display units (for example, 13, 14, 15). The element image display unit is a pixel group for displaying an image (element image) having a size corresponding to one element lens.

  First, the function of each part will be described. The display device 10 displays an element image corresponding to each element image display unit according to an instruction from the time-division synchronized image display means 40. The displayed element image passes through any one of the element lenses of the lenticular lens sheet 20 and projects the element image in the direction of the observer. The element image / element lens correspondence switching unit 30 switches the correspondence between the element image and the element lens according to an instruction from the time-division synchronized image display unit 40. The time-division synchronized image display unit 40 performs control to switch the correspondence between the element image display unit and the element lens by the element image element lens correspondence switching unit 30 in a time division manner, and the display content of the display device 10 is synchronized with the switching. Switch.

  In the present embodiment, the direction of light transmitted through the lenticular lens sheet 20 is switched in a time-sharing manner, and element images corresponding to the respective correspondences are displayed on the corresponding element image display units in synchronization with the switching. Realize viewing angle. The time division switching operation will be described with reference to FIG. FIG. 2 is an explanatory diagram of the behavior of the element image element lens correspondence switching means (M = 3). Here, a case where the number of switching of the element image element lens correspondence switching unit 30 (hereinafter referred to as M) is 3 will be described. However, the number of switching can be arbitrarily set within a range where an afterimage effect can be expected.

  First, at time t1, the time-division synchronized image display unit 40 instructs the element image element lens correspondence switching unit 30 to associate the element image display unit 14 with the element lens 23, and in synchronization therewith, the element image display unit 14, an element image A (an image to be displayed in a direction of being emitted from the element image display unit 14 via the element lens 23) is displayed for T1 seconds. Next, at time t2, an instruction is given to associate the element image display unit 14 with the element lens 24, and in synchronization therewith, the element image display unit 14 receives the element image B (the element lens 24 from the element image display unit 14). The image to be displayed in the direction of being emitted via is displayed for T2 seconds. Further, at time t3, the element image display unit 14 and the element lens 25 are instructed to correspond to each other, and in synchronization therewith, the element image display unit 14 receives the element image C (from the element image display unit 14 via the element lens 25). Then, the image to be displayed in the direction of ejection is displayed for T3 seconds. Since M = 3, one cycle is from t1 to here, and thereafter the same operation is repeated. T1, T2, and T3 are times until the next switching, respectively (the time required for switching is negligible). T1, T2, and T3 are equal time intervals, and are equal to or shorter than a time during which an afterimage effect can be perceived, preferably T1 = T2 = T3 = 60 ms or less.

  In the above description, attention is focused on only one element image display unit. Similarly, the other element image display units are also associated with element lenses at the respective timings t1, t2, and t3. The display unit, that is, the entire screen of the display device can be displayed at a time. Also, here, the time division number N (the display within one period and the number of switching between the element lens and the element image) is made the same as M, and only the time division control for switching the correspondence between the element lens and the element image is performed. However, it is also possible to display by dividing N into a plurality of partial screens by setting N to a value larger than M. For example, N is set to 4 times M, and the element image display units of the display device 10 are displayed in four groups.

  Subsequently, the processing of the time-division synchronized image display means 40 will be supplementarily described based on FIG. FIG. 3 is a flowchart (for one cycle) of the time-division synchronized image display means 40. Here, a case where the number N of time divisions is the same as M will be described. Each element lens is defined in advance as to which element image display unit corresponds to each of the N time division states. First, the time-division synchronized image display means 40 initializes the counter i (i = 1) (Step 1). Next, based on the correspondence between the i-th element lens and the element image display unit, the element image element lens correspondence switching means 30 is instructed to switch the correspondence between the element lens and the element image display unit, and the corresponding element image display unit group is displayed. Each element image is displayed (Step 2). Next, if i <N (Step 3), the counter i is incremented by 1 (Step 4), the time division time (T1) display is continued (Step 5), and then the process returns to Step 2. If i <N, the process ends. These are one-cycle processes, and this operation is repeated during the display time.

  As described above, in the present embodiment, the correspondence between the element lens and the element image display unit is switched in a time-sharing manner to avoid crosstalk and widen the viewing zone angle. Will be described. FIG. 4 is an explanatory diagram of the principle of widening the viewing zone angle.

  In FIG. 4, the direction in which the lenses are arranged is the X direction, and the direction in which the observer is is the Z direction. An example in which an element image is displayed using the element image display unit 14 which is a part of a pixel of the display device 10 will be described. The element lenses 23 to 27 are arranged substantially in parallel with the display device 10, and the pitch of the element image display unit and the pitch of the element lenses are set to be substantially equal. The distance between the display device 10 and the element lenses 23 to 27 is g, and the pitch between the element lenses 23 to 27 is p. In the conventional IP system in which the element lens and the element image display unit are fixed one-to-one as shown in FIGS. 16A and 16B, the element lens corresponding to the element image display unit 15 is 25, the adjacent element image display units are 14 and 16, the angle range of rays passing from the element image display unit 15 to the center of the element lens 25 is from α to β, and the viewing zone angle is θ = β−α. It becomes. In the case of this method, a light beam having an angle α or less enters the element lens 26 or the like, and a light beam having an angle β or more enters the element lens 24 or the like and becomes crosstalk.

  On the other hand, in the present embodiment, the correspondence between the element image display unit and the element lens is switched in three sets (in the case of M = 3), so at time t1, the element image display unit 14, the element lens 23, and the element image display unit 15 are switched. And the element lens 24, the element image display unit 16, and the element lens 25 are associated with each other, and an image to be projected toward the left direction (the negative direction of the X axis) in FIG. 4 is displayed. At time t2, the element image display unit 14 and the element lens 24, the element image display unit 15 and the element lens 25, the element image display unit 16 and the element lens 26 are associated with each other, and an image to be projected in the Z direction is displayed. At time t3, the element image display unit 14 and the element lens 25, the element image display unit 15 and the element lens 26, and the element image display unit 16 and the element lens 27 are made to correspond to each other in the right direction (the positive direction of the X axis) in FIG. Displays the image to be directed. That is, there are three states in the combination of the element lens and the element image display unit, and the viewing angle is different. The instantaneous viewing angle of each state is the same as the conventional one, but by switching between the three states while the afterimage effect remains, the effective viewing angle is an area θ obtained by combining the viewing angles of the three states. '= Β'-α', which is wider than the conventional viewing zone angle θ. If M is made larger than 3 within the range where the afterimage effect can be expected, the viewing zone angle can be made wider than when M = 3.

  Next, the relationship between the viewing zone angle, the display device, the distance g between the element lenses, and the pitch p between the element lenses will be described. 5 is a simplified diagram of part of FIG. 4, and FIG. 6 is a simplified diagram of FIG. From FIG. 6, θ = 2 arctan (p / (2 × g)) (corresponding to (Expression 1) described above). In the present embodiment, when M = 3, the widened viewing zone angle θ ′ = 2 arctan (3p / (2 × g)). In general, the viewing zone angle θ ′ = 2 arctan (Mp / (2 × g)) can be expressed for M in a range where an afterimage effect can be expected.

  In the present embodiment, the lenticular lens sheet 20 is used, but the present invention can also be applied when other lenses such as an array of fly-eye lenses are used.

  As described above, in the present embodiment, the correspondence between the element lens and the element image display unit is switched in a time-sharing manner without increasing the scale of the display device or without using a plurality of display devices. By avoiding crosstalk, the viewing zone angle can be enlarged.

(Embodiment 2)
FIG. 7 is a component diagram of the second embodiment. Components having the same functions as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. In the present embodiment, display is performed using the projection display device 50. Although not shown, the projection display device 50 is a set of element image display units that display an image (element image) having a size corresponding to one element lens, like the display device 10 of the first embodiment. .

  The time-division synchronized image display unit 40 projects the correspondence between the element lens on the lenticular lens sheet 20 arranged in the light beam direction on the projection display device 50 and the element image display unit during or after projection. Switching is performed by the image element lens correspondence switching means 30. The switching operation procedure is the same as in the first embodiment.

  As described above, in this embodiment, the correspondence between the element lens and the element image display unit is switched in a time division manner without increasing the scale of the display device or using a plurality of display devices. In addition, the viewing angle can be enlarged while avoiding crosstalk.

(Embodiment 3)
8, 9, and 10 are diagrams showing switching corresponding to the element image element lens of the third embodiment. In the present embodiment, the element image element lens correspondence switching means 30 is changed to the open / close shutter 60, but the other components are the same as those in the first embodiment. Components having the same functions as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. 8, 9, and 10 show only the main part of the configuration of the present embodiment, the time-division synchronized image display means 40 shown in FIG. 1 of the first embodiment also has an open / close shutter in this embodiment. The correspondence of the 60 element image display units is switched and the display of the element image of the display device 10 is controlled.

  The open / close shutter 60 is, for example, a waveguide-type open / close shutter using an optical fiber or the like, and operates as an optical path changing unit that changes the light path. As shown in FIGS. 8, 9, and 10, the opening / closing shutter 60 corresponds to the element image display units 12, 13, and 14 on the display device 10 in order, and the element lenses 23, 24, and 25 (on the lenticular lens sheet 20). 8), the element lenses 22, 23, and 24 (FIG. 9), and the element lenses 21, 22, and 23 (FIG. 10).

  The switching operation procedure is the same as in the first embodiment.

  As described above, in this embodiment, the correspondence between the element lens and the element image display unit is switched in a time division manner without increasing the scale of the display device or using a plurality of display devices. In addition, the viewing angle can be enlarged while avoiding crosstalk.

(Embodiment 4)
FIG. 11 is a component diagram of the fourth embodiment. In the present embodiment, the element image element lens correspondence switching means 30 is changed to the wavelength selection filter 70, but the other components are the same as those in the first embodiment. However, in the present embodiment, the display device 10 has R (red), G (green), and B (blue) subpixels. Although only the main part of the configuration of the present embodiment is shown in FIG. 11, the time-division synchronized image display means 40 shown in FIG. 1 of the first embodiment is also an element of the wavelength selection filter 70 in this embodiment. Processing for switching the correspondence of the image display unit and control of display of element images on the display device 10 are performed.

  As shown in FIG. 11, the pixel of the display device 10 is composed of three types of pixels of R, G, and B. In front of the display device 10, a wavelength selection filter 70 that transmits only one wavelength light of R, G, and B is disposed. Here, the wavelength selection filter 70 is sufficiently thin so as not to affect other than performing wavelength selection. R, G, and B described in the wavelength selection filter 70 indicate that only red, green, and blue light beams are transmitted.

  The image display and switching method of the present embodiment will be described. Hereinafter, the case where the arrangement of the RGB sub-pixels is a mosaic arrangement will be described. As shown in FIG. 11, the mosaic arrangement is an arrangement in which the same RGB colors are obliquely arranged. Normally, when used as a two-dimensional display, the horizontal RGB as in the pixel configuration 31 in the two-dimensional case is used. In the three-dimensional display that needs to provide a large amount of horizontal parallax, the pixels are configured by RGB in the vertical direction as in the three-dimensional pixel configuration 32 in the mosaic arrangement. For each pixel display unit of the display device, description will be made focusing on only one color of RGB. In FIG. 11, attention is focused on G in the element image display unit 11, B in the element image display unit 12, R in the element image display unit 13, and G in the element image display unit 14. FIG. 12A to FIG. 12C illustrate three types of positional relationships between the wavelength filter 70 and the display device 10. In FIG. 12A to FIG. 12C, the display device 10 indicates only the focused color with R, G, and B.

  At time t1, in the positional relationship between the element image display unit and the element lens in FIG. 12A, G of the element image display unit 12, B of the element image display unit 13, and R of the element image display unit 14 are wavelength selection filters. 70 to correspond to the left element lenses 21, 22, and 23, respectively. At time t2, in the positional relationship of FIG. 12B, the element image display units 11, 12, 13, and 14 are associated with the element lenses 21, 22, 23, and 24 directly above, respectively. 12C, the element image display units 11, 12, and 13 are associated with the right element lenses 22, 23, and 24, respectively.

  Although the case of the mosaic arrangement has been described above, when the arrangement of the sub-pixels is another arrangement, for example, a stripe arrangement, the third order at the time of the stripe arrangement of FIG. 17 is obtained by a method such as tilting the lenticular lens sheet 20. By configuring the pixels with diagonal RGB as in the original pixel configuration 33, the same effects as in the mosaic arrangement can be obtained.

  In the present embodiment, the time division synchronized image display means 40 switches the above three states in a time division manner, that is, the relationship between the color transmitted through the wavelength selection filter 70 and the color displayed on the display device is time division. By switching at, the viewing angle is widened by changing the correspondence between the element lens and the element image display unit as in the first embodiment.

  In this way, the time-division synchronized image display means 40 switches in a time-division manner within the effective range of the afterimage effect by the combination of the three types of positional relationships between the wavelength selection filter 70 and the display device 10, and displays in synchronization therewith. By repeating the image switching process, it is possible to avoid crosstalk and widen the viewing zone angle as in the first embodiment.

  Regarding the switching of the positional relationship between the display device 10 and the wavelength selection filter 70, the wavelength selection filter 70 is fixed to the lenticular lens sheet 20, and the relationship between the pixels of the lenticular lens sheet 20 and the display device 10 is changed to the left and right (element lens). Or a variable wavelength selection filter may be used.

  As described above, in the present embodiment, since the correspondence between the element lens and the element image is switched using the wavelength selection filter 70, a complicated optical path switching mechanism is not required, and crosstalk is avoided and viewing is performed. The area angle can be enlarged.

(Embodiment 5)
FIG. 13 is a component diagram of the fifth embodiment. In the present embodiment, the element image element lens correspondence switching means 30 is changed to the polarization filter 80 and the width of the element image display unit is changed, but the other components are the same as those in the first embodiment. Although only the main part of the configuration of the present embodiment is shown in FIG. 13, the time-division synchronized image display unit 40 shown in FIG. 1 of the first embodiment also uses the element image of the polarization filter 80 in this embodiment. The process of switching the correspondence of the display unit and the control of the display of the element image of the display device 10 are performed. In addition, the element image display unit of the display device 10 can display each polarized light, and the partition of the element image display unit can be changed by the time-division synchronized image display means 40.

  21-29 are element lenses, 80 is a polarizing filter, 91-97 are element image display parts. The polarizing filter 80 has a configuration in which element filters having polarization transmission characteristics of H or V are alternately arranged. In the polarizing filter 80, the element filter has the same length as the element lens, and the polarization direction is indicated by H and V in FIG. Here, the polarizing filter is sufficiently thin so as not to affect other than the polarization.

  The element image display unit is twice as wide as the element lens, and the pitch of the element lens is p. The division of the element image display unit of the display device 10 can be changed, and FIG. 14A shows an example of the positional relationship between the element lens, the element image display unit, and the polarization filter when V-polarized light is displayed on the display device. . FIG. 14A is an explanatory diagram of one embodiment of claim 5. An element filter that transmits V-polarized light is disposed directly above each element image display unit. For example, the element image display unit 91 has the same X coordinate (direction in which the element lenses are arranged) as the center of the element lens 22, and the element lenses 21 and 23 are arranged so as to be shifted from the element image display unit 91 by 0.5p, respectively. ing. In this case, since the V-polarized display passes only through the V-polarized filter, the element image display units 91, 92, 93, and 94 correspond to the element lenses 22, 24, 26, and 28, respectively (corresponding is indicated by an arrow). ).

  FIG. 14B shows an example of the positional relationship between the element lens, the element image display unit, and the polarization filter when displaying H-polarized light. FIG. 14B is an explanatory diagram of an embodiment of claim 5. When displaying H-polarized light, the time-division synchronized image display means 40 shifts the division of the element image display unit of the display device 10 by ½ of the size of the element image display unit. For example, the element image display unit 95 includes pixels that were the element image display unit 91 and pixels that were the element image display unit 92 when displaying V-polarized light. The element image display unit 95 has the same X coordinate as the center of the element lens 23 and is shifted from the element lenses 22 and 24 by 0.5 p. In this case, the element image display units 95, 96, and 97 correspond to the element lenses 23, 25, and 27, respectively.

  In accordance with an instruction from the time-division synchronized image display means 40, the above two states are switched in a time-division manner within the effective range of the afterimage effect, and the process of switching the corresponding element image to be displayed is performed in synchronization therewith. In the present embodiment, M = 2 and the viewing zone angle θ = 2 arctan (p / g), which can be wider than (Equation 1).

  In the present embodiment, the separation of the element image display unit is changed at the same time as switching between the H and V polarization displays. However, the element image display unit is not changed when switching between the H and V polarization displays. 80 may be fixed to the lenticular lens sheet 20, and the relationship with the display device may be moved left and right (in the direction in which the element lenses are arranged).

  As described above, in the present embodiment, since the correspondence between the element lens and the element image display unit is switched using the polarizing filter 80, a complicated optical path switching mechanism is not required, and crosstalk is avoided. The viewing zone angle can be enlarged.

  As described above, the three-dimensional image display device and the three-dimensional image display method according to the present invention are useful for three-dimensional image display for performing a three-dimensional operation, and are particularly suitable for a naked-eye three-dimensional image display system.

Component diagram of the first embodiment Explanatory drawing about behavior of element image element lens correspondence switching means (M = 3) Flow chart of time-division synchronized image display means Illustration of the principle of widening the viewing zone angle A simplified diagram of part of FIG. A simplified version of FIG. Component diagram of the second embodiment The figure showing the change corresponding to the element image element lens of Embodiment 3 The figure showing the change corresponding to the element image element lens of Embodiment 3 The figure showing the change corresponding to the element image element lens of Embodiment 3 Component diagram of the fourth embodiment (A) An explanatory diagram of an embodiment of the fourth embodiment, (b) an explanatory diagram of an embodiment of the fourth embodiment, (c) an explanatory diagram of an embodiment of the fourth embodiment. Component diagram of the fifth embodiment (A) Explanatory drawing of one embodiment of claim 5, (b) Explanatory drawing of one embodiment of claim 5. The figure which shows the relationship between the element image and element lens in a prior art (A) The figure which shows the relationship between the focal distance of an element lens, and a viewing zone angle, (b) The figure which shows the relationship between the focal distance of an element lens, and the enlarged viewing zone angle The figure which shows a three-dimensional image structure when a display apparatus is a subpixel structure of a stripe arrangement | sequence.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Display apparatus 11, 12, 13, 14, 15, 16, 17, 18, 19 Element image display part 20 Lenticular lens sheet 21, 22, 23, 24, 25, 26, 27, 28, 29 Element lens 30 Element image Element lens correspondence switching means 31 Two-dimensional pixel configuration 32 Three-dimensional pixel configuration in mosaic arrangement 33 Three-dimensional pixel configuration in stripe arrangement 40 Time-division synchronized image display means 50 Projection-type display device 60 Opening / closing shutter 70 Wavelength Selection filter 80 Polarizing filter 91, 92, 93, 94, 95, 96, 97 Element image display part g Distance between lenticular lens and display device (in case of non-projection type) p Pitch of lenticular lens

Claims (8)

Two-dimensional display means comprising a plurality of element image display units for displaying element images;
A lens array which is arranged in the light beam direction of the two-dimensional display means and which is composed of a plurality of element lenses which allow the light beam of the element image display unit to pass through
An element image element lens correspondence switching means for switching correspondence between the element image display unit and an element lens that transmits light rays from the element image display unit;
Time-division synchronized image display means for instructing switching to the element image element lens correspondence switching means, and causing the element image display unit to display element images in a time-division manner in synchronization with the instruction;
A three-dimensional image display device comprising: The three-dimensional image display apparatus according to claim 1, wherein the two-dimensional display unit is a projection type display unit. 3. The three-dimensional image display device according to claim 1, wherein the element image element lens correspondence switching unit is an optical path changing unit. The three-dimensional image display device according to claim 1, wherein the element image element lens correspondence switching unit is a wavelength selection filter. The three-dimensional image display device according to claim 1, wherein the element image element lens correspondence switching unit is a polarization filter. 6. The number of divisions in the case where an element image is displayed on the element image display unit in a time division manner and the number of switching stages of the element image element lens correspondence switching means are made equal. The three-dimensional image display apparatus described in 1. The viewing angle θ of the three-dimensional image satisfies “θ> 2 arctan (p / (2g)): p is the pitch of the element lens, and g is the distance between the two-dimensional display device and the lens array”. The three-dimensional image display device according to any one of 1, 3 to 6. A three-dimensional image display method for displaying a plurality of element images and projecting a three-dimensional image through a lens array composed of element lenses corresponding to the element images,
An image display step of displaying a plurality of element images on the element image display unit;
A switching instruction step for instructing switching between the element image display unit and an element lens corresponding to the element image display unit;
Based on the instructions, an element image element lens correspondence switching step for switching the correspondence between the element image display unit and the element lens,
Including
The three-dimensional image display method, wherein the image display step, the switching instruction step, and the element image element lens correspondence switching step are repeatedly executed by the number of switching stages corresponding to the element image and the element lens.

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