JP4634112B2 - Stereoscopic video display device, electronic apparatus, and planar display method in stereoscopic video display device - Google Patents

Description

  The present invention relates to a stereoscopic video display device that allows an image displayed on a display screen to be viewed through a lens plate, an electronic apparatus that includes or is connected to a stereoscopic video display device, and a stereoscopic video display device. It is related with the planar view display method.

  In recent years, many stereoscopic video display devices have been developed. The stereoscopic video display device is a display device using binocular parallax. Since the human eyes are located apart from each other on the left and right, there is a slight shift in the video captured by each eye, and the stereoscopic effect is recognized by this parallax. The stereoscopic video display device realizes a stereoscopic video by intentionally generating the binocular parallax.

  The planar video and stereoscopic video described in this specification indicate an image formed in the observer's cerebrum by binocular parallax, and the planar video and stereoscopic video are images displayed on the display screen. It shall be shown.

  2. Description of the Related Art Conventionally, as a stereoscopic video display device, there is a device that recognizes a stereoscopic video image by arranging a stereoscopic image optical element such as a lenticular lens or a parallax barrier on the surface of a display panel such as a flat liquid crystal display. However, when comparing the planar image when the stereoscopic image optical element is arranged with the planar image when it is not arranged, the former image quality (mainly the definition of the planar image) is reduced. End up. Therefore, there has been a demand to display a planar image displayed by arranging the stereoscopic image optical element without degrading the image quality.

As a solution to this, when the distance between the stereoscopic image optical element and the display panel is d and the focal length of each microlens constituting the lenticular lens array is f, d = f when displaying a stereoscopic image. There is known a method in which a lenticular lens array is arranged at the position of, and a lenticular lens array is arranged at a position of d = 0 when displaying a planar image (see Patent Document 1).
JP-A-9-197343

  However, in the above method, it is difficult to accurately set d = 0 when displaying a planar view image in consideration of the thickness of the protective glass and the lenticular lens array arranged on the display panel. For this reason, a planar view image has to be displayed at d> 0, and there has been a problem in that the image quality of the planar view image is degraded and the image quality is degraded.

  An object of the present invention is to provide a stereoscopic video display device that displays a planar video image without degrading the video quality of the stereoscopic video image, an electronic apparatus that includes or is connected to the stereoscopic video display device, and a stereoscopic video image display device. It is to provide a planar view display method in a video display device.

In order to solve the above problems, a stereoscopic image display device according to a first aspect of the present invention is a display panel in which subpixels are arranged in a predetermined order in the row direction and the column direction (for example, the liquid crystal panel 80 in FIG. 7 and the liquid crystal in FIG. A panel 804), a lens plate of a lenticular lens (for example, the lens plate 70 of FIG. 7) in which the lens pitch direction is disposed obliquely with respect to the column direction of the display panel, a first position for stereoscopic display, and Distance changing means for changing the distance between the display panel and the lens plate by moving the lens plate to at least two positions of the second position for planar display (for example, the switching mechanism 830 in FIG. 20, FIG. 20). The lens plate 802) includes the lens plate 802), wherein the second position is positioned along the column direction of the display panel with respect to a pixel width of one pixel of the display panel. When the ratio of the lens width for one microlens of the plate is L, the angle of the lens pitch direction of the lens plate with respect to the column direction of the display panel is θ, and the focal length of each microlens on the lens plate is f, The distance d between the display surface of the display panel and the principal point of the microlens of the lens plate is a position of d = nf / (Lcos ² θ) (n is an arbitrary integer of 1 or more). .

As another invention, a display panel (for example, the liquid crystal panel 80 in FIG. 7 and the liquid crystal panel 804 in FIG. 20) in which subpixels are arranged in a predetermined order in the row direction and the column direction, and the lens pitch direction indicate the display. A planar display method in a stereoscopic video display apparatus including lens plates (for example, a lens plate 70 in FIG. 7 and a lens plate 802 in FIG. 20) of lenticular lenses disposed obliquely with respect to the column direction of the panel. The ratio of the lens width for one microlens of the lens plate along the column direction of the display panel to the pixel width for one pixel of the display panel is L, and the ratio of the lens plate to the column direction of the display panel When the angle in the lens pitch direction is θ and the focal length of each microlens on the lens plate is f, the display surface of the display panel and the microresist of the lens plate are The distance d between the principal point of the figure, the ^{d = nf / (Lcos 2 θ} ) (n being any integer not less than 1) planar image display method for performing planar view display by moving the lens plate to the position of It may be configured.

According to these inventions, the distance d = nf / (Lcos ² θ) between the display surface of the display panel and the principal point of the microlens of the lens plate at the time of planar view display (n is an arbitrary integer of 1 or more) The lens plate is moved so that Thereby, it is possible to prevent the occurrence of color stripes in the image projected on the lens plate during planar display, and to display the planar image without degrading the image quality even when the lens plate is arranged. Of course, as a method for changing the distance between the display panel and the lens plate, not only the lens plate but also the display panel may be moved.

As a second invention, the distance d between the display surface of the display panel and the principal point of the microlens of the lens plate is nf / (Lcos ² θ) −0.05 f ≦ d ≦ nf / (Lcos ² θ). It is good also as accepting to the range of + 0.05f. Further, as a third invention, it may be recognized up to a range of nf / (Lcos ² θ) −0.1f ≦ d ≦ nf / (Lcos ² θ) + 0.1f.

  A fourth invention is the stereoscopic image display device according to any one of the first to third inventions, wherein the second position is a position where d is a value closest to 2f (for example, FIG. 15A). The distance between the principal points and the screen is d = 2.47f).

  According to the fourth aspect of the present invention, when a planar image is displayed, the lens plate is moved to a position where d is a value closest to 2f, so that almost all pixels of the display panel can be transferred to the observer via the lens plate. Can be recognized. Therefore, the image displayed on the display panel can be displayed on the lens plate without reducing the resolution.

The fifth invention is a stereoscopic image display device according to any one of the first to third inventions,
The second position is a position where d is a value smaller than 2f and a value closest to 2f (for example, the principal point / inter-screen distance d = 1.23f in FIG. 14A). To do.

The sixth invention is a stereoscopic image display device according to any one of the first to third inventions,
The second position is a position where d is a value larger than 2f and a value closest to 2f (for example, the main point / inter-screen distance d = 2.47f in FIG. 15A). To do.

  Comparing the case where d is small and the case where d is large, the display resolution tends to be lower in the former, and the contrast tends to decrease in the latter. Therefore, according to the fifth invention, the same effects as those of the first to third inventions can be obtained, and a planar image with high contrast can be displayed as compared with the case where d is larger than 2f. On the contrary, according to the sixth invention, the same effects as those of the first to third inventions can be obtained, and a planar image having a higher resolution can be displayed as compared with the case where d is smaller than 2f. .

  A seventh invention is a stereoscopic image display device according to any one of the first to sixth inventions, and driving means for driving the distance changing means in accordance with a drive signal inputted externally (for example, in FIG. A drive device 840 and an operation control device 850) are further provided.

  According to the seventh aspect, the distance changing means can be driven in accordance with a drive signal input from the outside. Accordingly, for example, the stereoscopic video display device is connected to an external device such as a personal computer or a game device, and the distance between the display panel and the lens plate is changed in accordance with a drive signal input from the external device. It becomes possible to set.

  An eighth invention is a stereoscopic image display device according to any one of the first to sixth inventions, wherein an output means (for example, an output device for outputting a notification signal corresponding to an operating state of the distance changing means to an external device) , And the operation control device 850 and the control I / O 860) of FIG.

  According to the eighth aspect, a notification signal corresponding to the operating state of the distance changing means can be output to the outside. That is, it is effective when a stereoscopic video display device is connected to an external device and image data input from the external device is displayed on the display panel. That is, it is possible to instruct an external device to output image data corresponding to the positional relationship between the lens plate and the display panel (the operating state of the distance changing unit).

  A ninth aspect of the invention is a stereoscopic video display device according to the seventh aspect of the invention, and image control means for switching between stereoscopic image information and planar image information and outputting to the stereoscopic video display device (for example, FIG. 17 CPU 600; step A5 or A3 in FIG. 18 and instruction output means for outputting a drive signal for driving the drive means in conjunction with switching of the output image of the image control means (for example, CPU 600 in FIG. 17; 18 steps A2 or A4).

  According to the ninth aspect, in an electronic apparatus including a stereoscopic video display device, depending on the type of image to be displayed, that is, depending on whether an image for stereoscopic viewing or for planar viewing is displayed. The distance between the lens plate and the display panel can be changed. Therefore, for example, when an electronic device is used as a game device, it is possible to change the type of image to be generated / displayed according to the game stage according to the game program and to change the distance between the lens plate and the display panel at the same time. It becomes.

  A tenth aspect of the invention is an electronic device connected to the stereoscopic video display device of the eighth aspect of the invention, and the stereoscopic image information and the planar image information are received in accordance with a notification signal output from the output means. It is characterized by comprising image control means for switching and generating and outputting to the stereoscopic video display device.

  According to the tenth aspect, the type of image (for stereoscopic viewing / for planar viewing) to be output to the stereoscopic video display device is switched in response to the notification signal input from the stereoscopic video display device. For example, in the stereoscopic video display device, when the distance between the lens plate and the display panel is switched according to whether or not the input button is pressed, the pressing signal is output to the electronic device. The electronic device that has received the press signal can realize a simple configuration in which the type of image output to the stereoscopic video display device is changed.

According to the present invention, the lens plate is moved so that the distance between the display panel and the lens plate is d = nf / (Lcos ² θ) (n is an arbitrary integer equal to or greater than 1) during the planar display. Thus, it is possible to prevent the occurrence of color fringes in the image projected on the lens plate during the planar display.

Further, at the time of displaying a planar image, a position where the distance d between the display panel and the lens plate satisfies d = nf / (Lcos ² θ) (n is an arbitrary integer equal to or greater than 1) and is a value closest to 2f By moving the lens plate, the observer can recognize almost all pixels of the display panel via the lens plate. Therefore, the image displayed on the display panel can be displayed on the lens plate without reducing the resolution.

By making this distance d satisfy d = nf / (Lcos ² θ) (n is an arbitrary integer equal to or greater than 1), and not exceeding 2f, 2f becomes the most recent value. It is possible to display without reducing the contrast while suppressing the occurrence.

The distance d satisfies d = nf / (Lcos ² θ) (n is an arbitrary integer equal to or greater than 1), and exceeds 2f and becomes a value closest to 2f. The display without reducing the resolution can be performed while preventing the occurrence of the above.

  Note that, by setting the error of the distance d to be within ± 5% or ± 10% with respect to the focal length f, it is possible to obtain substantially the same effect as described above.

  Thus, for example, in devices such as display devices for video equipment such as televisions and DVD players, home and business game devices, portable game devices, display parts such as pachinko machines and pachislot machines, and displays such as personal computers. When watching video, playing games, etc., or monitoring and observing video for plane viewing with surveillance cameras, etc. Can be expected.

  In addition, for example, when displaying character information and drawings on a screen of a car navigation system, a display of a personal computer, a mobile phone, a PDA, an electronic notebook, an electronic calculator, an electronic dictionary, etc., more detailed and more This information can be displayed in an easy-to-see manner so that the user can recognize it.

  In addition, the above effect was demonstrated according to the use with which each apparatus is normally used, Comprising: The use of each apparatus and the effect of this invention are not limited. That is, for example, even if it is an electronic notebook or the like, when there is a use for watching videos or playing games instead of characters, the present invention is expected to have an effect that eyes will not get tired even if watching or playing for a long time is continued. it can. For example, even if it is a game machine or a pachinko machine, when it is desired to display character information, drawings, etc., according to the present invention, it is possible to display more detailed information in an easy-to-see manner so that the user can recognize it. it can.

  Embodiments to which the present invention is applied will be described below with reference to the drawings. In addition, although the case where a flat liquid crystal display (liquid crystal panel) is used as an image display means of a stereoscopic video display device will be described as an example, application of the present invention is not necessarily limited to this case. In addition, various types of lens plates installed in the stereoscopic video display device are conceivable (for example, a so-called “eye-eye lens” in which lattice lenses are arranged vertically and horizontally). A lenticular lens plate is used as the plate.

  In addition, although there are lenticular lens plates that have unevenness on both sides, the lenticular lens plate handled in the present embodiment is a lens plate with one surface having unevenness and the other surface being substantially planar, The concavo-convex surface is a semi-cylindrical or optically equivalent microlens (unit lens constituting a lenticular lens plate) arranged continuously. Hereinafter, the lenticular lens plate is simply referred to as a lens plate, and the microlens (unit lens) is simply referred to as a lens.

  First, the stereoscopic video display device will be described. In order to simplify the description, a twin-lens stereoscopic image display device will be described as an example. Here, the twin-lens type means a display type that displays different images in two directivity directions in a stereoscopic video display device.

  FIG. 1 is a diagram schematically showing a vertical cross section with respect to the display surface of a binocular stereoscopic video display device 1. More precisely, FIG. 1 is a diagram showing a cross section perpendicular to the image display surface in the horizontal direction of the display surface of the stereoscopic video display device 1, that is, parallel to a straight line including both eyes of the observer.

  As shown in FIG. 1, the stereoscopic video display device 1 mainly includes a lens plate 10, a liquid crystal panel 20, and a backlight 30. The lens plate 10, the liquid crystal panel 20, and the backlight 30 are each plate-like bodies and are arranged in parallel to each other. The backlight 30 emits light, which passes through the liquid crystal panel 20 and the lens plate 10 and travels out of the stereoscopic video display device 1. That is, the observer sees an image displayed on the liquid crystal panel 20 through the lens plate 10.

  The lens plate 10 is designed so that the lens pitch x (lateral width; length in the width direction of the microlens) of each lens (microlens) corresponds to two subpixels, and the uneven surface 10c of the lens is a liquid crystal. It arrange | positions so that the display surface 20a of the panel 20 may be opposed. In order to realize a stereoscopic image on the stereoscopic image display device 1 shown in FIG. 1, generally, the distance between the lens plate 10 and the liquid crystal panel 20 is made to coincide with the focal length of each lens of the lens plate 10. In other words, the lens plate 10 and the liquid crystal panel 20 are arranged so that the focal plane of each lens is positioned in the vicinity of the display surface 20 a of the liquid crystal panel 20. By setting in this way, each sub-pixel of the liquid crystal panel 20 is enlarged to the same width as the lens pitch by each lens of the lens plate 10. Each lens functions to give directivity to light emitted from each subpixel of the liquid crystal panel 20.

  FIG. 2 is a diagram schematically showing a partial cross section of the lens plate 10 and the liquid crystal panel 20, and the distance between the lens plate 10 and the liquid crystal panel 20 matches the focal length f of each lens of the lens plate 10. This shows the state that has been caused.

  As shown in the figure, the liquid crystal panel 20 has subpixels pxl1, pxl2, pxl3, pxl4, pxl5, pxl6,. The lens pitch x of each lens of the lens plate 10 corresponds to 2 subpixels as described above. In such a setting, when the stereoscopic image display device 1 is viewed at an ideal distance E and the lens 14 is viewed from the left eye el, the focal point of the lens 14 is located at the subpixel pxl4. The subpixel pxl4 appears to be enlarged.

  On the other hand, when the lens 14 is viewed from the right eye er, the focal point of the lens 14 is located at the subpixel px13, so that the subpixel px13 is enlarged on one surface of the lens 14. Thus, by setting the focal point of each lens of the lens plate 10 in the vicinity of the display surface 20a of the liquid crystal panel 20, different images can be recognized by both eyes of the observer.

  Based on the above configuration, a method for switching between stereoscopic view and planar view will be described in detail. As described above, the stereoscopic video display apparatus is designed so that only one sub-pixel can be seen through the lens in each directivity direction in order to realize stereoscopic vision. Therefore, when displaying a stereoscopic image, the number of subpixels that can be seen through the lens plate 10 is smaller than the number of subpixels of the liquid crystal panel 20. For example, according to the stereoscopic video display device 1 shown in FIG. 1, the number of subpixels corresponding to the lens pitch x is 2, so the resolution of the image recognized by one eye is compared with the actual resolution of the liquid crystal panel 20. It becomes 1/2.

  On the other hand, when realizing the planar view, it is required to be easy to see the image rather than the stereoscopic effect of the image. Therefore, it is desirable that the same image is recognized by both eyes with a resolution equivalent to the resolution of the liquid crystal panel 20. . Further, from the viewpoint of convenience of the stereoscopic video display device, it is necessary to switch between the stereoscopic view and the planar view without removing the lens plate 10.

  Therefore, by adjusting the distance between the lens plate 10 and the liquid crystal panel 20, the number of sub-pixels seen through the lens becomes equal to the number of sub-pixels corresponding to the lens pitch x, thereby realizing a planar display. Hereinafter, the distance between the principal point G corresponding to the focal plane on the pixel surface side of the lens and the display surface of the liquid crystal panel is referred to as a principal point / inter-screen distance d.

  FIG. 3 is a diagram for explaining an image that can be seen when the stereoscopic image display device 1 shown in FIG. 1 is observed with the right eye er from an ideal position. FIG. 3A is a diagram schematically illustrating an optical path of light when displaying a stereoscopic image. At this time, the principal-screen distance d is d = f (f: focal length).

  According to FIG. 3A, when viewed from the right eye er, the focal point of the lens 14 is located at the subpixel px13. Therefore, the sub-pixel px13 is enlarged and projected on the lens 14. Similarly, the subpixel px15 is displayed on the lens 16 and the subpixel px17 is displayed on the lens 18. When viewed from the left eye el, the lens 14 displays pxl4, the lens 16 pxl6, and the lens 18 pxl8.

  FIG. 3B is a diagram showing an optical path when displaying a planar view image. At this time, the distance d between the principal points and the screen is d = 2f. According to FIG. 3B, the focal point of each lens is the same as the position shown in FIG. 3A when viewed from the right eye er, but the distance between the principal point and the screen is d = 2f. The number of subpixels reflected is equal to the number of subpixels corresponding to the lens pitch x. Specifically, the lens 14 is projected with the subpixels pxl2 and pxl3 switched, the lens 16 is projected with the subpixels pxl4 and pxl5 switched, and the lens 18 is projected with the subpixels pxl6 and pxl7. It will be projected in the state that was replaced. Similarly, when viewed from the left eye, the image is displayed with the subpixels corresponding to each lens interchanged.

  In this way, by changing the distance d between the principal point and the screen from d = f (focal length) to d = 2f, the number of subpixels visible through the lens is changed to the number of subpixels corresponding to the lens pitch x. As a result, all the subpixels of the liquid crystal panel 20 can be recognized by both eyes of the observer.

  In the above description, a binocular stereoscopic image display device has been described as an example, but it is not necessary to limit to a binocular type, and it applies to a trinocular type, a quadruple type, a five-lens type,. Of course, you may do.

  By the way, in a general stereoscopic video display device, in order to suppress the occurrence of moire, the lens pitch direction (micrometer) of the lens plate with respect to the arrangement in the column direction (horizontal scanning direction; scanning line direction) of the subpixels of the liquid crystal panel. The lens is arranged so that the connecting direction of the lenses forms an angle θ. This will be described in detail with reference to FIG.

  FIG. 4A is a plan view for explaining an arrangement relationship between the stripe-arranged liquid crystal panel 20 and the five-lens lens plate. Hereinafter, the liquid crystal panel 20 will be described as having a stripe arrangement, but it is sufficient that the subpixels of three colors of RGB are arranged in a predetermined (constant) order in the row direction and the column direction. It may be a rectangle array.

  Lines A1, A2 and A3 in FIG. 4A are lines showing the positions of the end portions of the lenses of the lens plate 10 arranged above the liquid crystal panel 20 (front of the hand in FIG. 4). The end portion of the lens is a valley portion of the lens such as 10a and 10b in the lens plate 10 shown in FIG. 4B, and refers to a boundary portion of the lens.

In FIG. 4, the lens plate 10 is disposed obliquely so that the lens pitch direction forms an angle θ with respect to the column direction of the sub-pixels of the liquid crystal panel 20. (In FIG. 4, the angle between the row direction of the liquid crystal panel 20 and the boundary line of the microlens of the lens plate 10 is described as θ, which is synonymous). Specifically, the lens plate 10 is arranged so that the end of the lens is positioned above the diagonal line of the rectangle including the subpixel R11 and the subpixel R12 (line A1). In the present embodiment, one subpixel of the liquid crystal panel 20 has a ratio of the length in the column direction to the length in the row direction (vertical scanning line direction; signal line direction) is 1: 3. Therefore, the subpixels R11 and R12 The ratio of the length in the column direction and the length in the row direction of the rectangle combined is 1: 6. That is, θ = tan ⁻¹ (1/6) ≈9.5 °. Therefore, the lens plate 10 is arranged such that the lens pitch direction of the lens plate 10 forms an angle θ = 9.5 ° with respect to the arrangement in the column direction of each sub-pixel of the liquid crystal panel 20.

  In this way, the individual lens pitch directions of the lens plate 10 are inclined with respect to the arrangement in the column direction of each subpixel of the liquid crystal panel 20 (in other words, the lens plate with respect to the row direction of the liquid crystal panel 20). 10), the moire generated in the image when viewed through the lens plate 10 can be dispersed and made inconspicuous.

  However, since the color of each sub-pixel is continuously enlarged in the oblique direction due to the inclination of the lens plate 10, thick color stripes in the oblique direction are generated, and the quality is deteriorated even when a planar view image is displayed. I found out.

  The generation of this color stripe will be described in detail. FIG. 4B is a cross-sectional view taken along the line of sight T1-T2 in FIG. The distance d between the principal points and the screen is d = 2f. 4B, the lens 41 displays subpixels B12 and G12, which are subpixels corresponding to the lens pitch of the lens plate 10, and a part of the subpixel R12. However, the subpixels B12 and G12 projected on the lens 41 and a part of the subpixel G12 are projected in an order in which the arrangement order in the liquid crystal panel 20 is switched. Further, the sub-pixels R21 and G21 and a part of the sub-pixel B21 are projected on the lens 42 in an order in which the arrangement order in the liquid crystal panel 20 is switched.

  As described above, the subpixels corresponding to the lens pitch are displayed on each lens of the lens plate 10 in the order in which the arrangement order of the subpixels of the liquid crystal panel 20 is changed. Therefore, a part of the subpixel B21 is displayed next to a part of the subpixel R12.

  FIG. 5 is a diagram illustrating an example of an image obtained by viewing the image displayed on the liquid crystal panel 20 through the lens plate 10. A cross-sectional view taken along line T3-T4 in FIG. 5 corresponds to the view shown in FIG. Lines A 1, A 2, and A 3 in the figure are lines showing the positions of the end portions of the lenses of the lens plate 10 disposed above the liquid crystal panel 20.

  Focusing on the vicinity of the line of sight T3-T4, a part of the sub-pixel R12 is projected by the lens 41. The other part of the subpixel R12 that is not projected by the lens 41 (the portion of the range R12a in the subpixel R12 in FIG. 4B) is projected by the adjacent lens (not shown) that is not the lens 42. In this way, the image of the subpixel R12 is divided and displayed.

  That is, the sub-pixel located below the end of the lens plate 10 is split and projected. That is, in FIG. 4A, the subpixels R11 and R12 that overlap with the line A1, the subpixels B11 and R22 that overlap with the line A2, and the subpixels B21 and B22 that overlap with the line A3 are split and projected. As a result, a phenomenon that sub-pixels of the same color are not continuously projected at the end of the lens plate 10 occurs.

  In this way, when the occurrence of moire is prevented by disposing the lens pitch direction of the lens plate 10 at an angle θ with respect to the row direction of the sub-pixels of the liquid crystal panel 20, the principal point / inter-screen distance d. By setting 2f to 2f, the sub-pixels below the end of each lens are projected obliquely along the end of the lens and projected. For this reason, the planar view image as a whole includes an image including color stripes as shown in FIG. 6, and the period of the color stripes increases as it is recognized with the spatial resolution of the human eye. FIG. 6 is a diagram illustrating an example of an image displayed on the entire lens plate 10, and is a diagram illustrating an image when all the sub-pixels of the liquid crystal panel 20 are colored equally.

  In FIG. 6, it can be seen that, for example, dark color stripes (blue by B subpixels) are projected on a straight line connecting T5 and T6 or on a straight line connecting T7 and T8. In addition, bright color stripes (green by the G sub-pixel) are projected between them. These color stripes are projected on the entire lens plate 10. As described above, the lens pitch direction of the lens plate 10 is arranged at an angle θ with respect to the sub-pixel column direction of the liquid crystal panel 20, so that the spatial resolution of the human eye is displayed on the image displayed on the lens plate 10. Color stripes of a recognizable period are generated, resulting in a reduction in the quality of the planar video image.

  Therefore, by changing the distance d between the principal points and the screen, the colors of the sub-pixels projected in the vicinity of the end portions of the lenses of the lens plate are made continuous. In other words, the lens plates are arranged at such distances that the subpixels projected on the adjacent lenses have the same color at the end portion of the lens and the width of the same color portion is constant. FIG. 7 is a cross-sectional view when the lens plate 70 is disposed on the liquid crystal panel 80 so as to satisfy the above-described conditions.

Hereinafter, a case where the end U2 of the lens plate 70 is located above the boundary between the subpixel B42 and the subpixel R51 will be described with reference to FIG. α is the distance from the center of the lens to the end of the lens, which is half the lens pitch. A point S _1B is a point on the sub-pixel G 42 where a perpendicular line from the center of the lens 72 to the liquid crystal panel 80 and the upper surface of the liquid crystal panel 80 intersect in FIG. Point Q _2B is a point indicating one end of the range of the liquid crystal panel 80 displayed on the lens 72. β is the distance between point S _1B and point Q _2B . The points S _1A and Q _2A correspond to the lens 73 in the same manner.

Then, the point Q _2B is located at the boundary of the sub-pixel B32 and the sub-pixel R42, and the point Q _2A is to be located on the boundary of the sub-pixel B51 and the sub-pixel R61, defined distance d between the principal point-Screen .

  In such a state, a part of the subpixel R51 and the subpixels B42, G42, and R42 are displayed on the lens 72. However, a part of the sub-pixel R51 and the sub-pixels B42, G42, and R42 are displayed in an order in which the arrangement order in the liquid crystal panel 80 is changed. Further, the sub-pixels B51, G51, R51 and a part of the sub-pixel B42 are projected on the lens 73 in an order in which the arrangement order in the liquid crystal panel 80 is switched.

Here, since the lens plate 70 is arranged so that the point Q _2B is located at the boundary between the sub-pixel B32 and the sub-pixel R42, and the point Q _2A is located at the boundary between the sub-pixel B51 and the sub-pixel R61, the lens 72 side near the end U2 The sub-pixel R42 and the sub-pixel B51 are projected on the lens 73 side near the end U2 without being split.

  Further, a part of the subpixel G42, subpixels R42, B32, and G32, and a part of the subpixel R32 are displayed on the lens 71 in an order in which the arrangement order in the liquid crystal panel 80 is switched. Here, a part of the subpixel R32 is projected on the lens 71 side near the end U1, and a part of the subpixel R51 is projected on the lens 72 side near the end U1. The subpixel R32 and the subpixel R51 have the same color, and the combined width projected on the lens plate 70 is equal to that of the subpixel (for example, G32 in the figure) projected alone (for why it is equal, [0078] (It will be described later in the paragraph.)

  In addition, a part of the subpixel B61, the subpixels G61, R61, and B51 and a part of the subpixel G51 are displayed on the lens 74 in an order in which the arrangement order in the liquid crystal panel 80 is switched. Here, a part of the subpixel B61 is projected on the lens 74 side near the end U3, and a part of the subpixel B42 is projected on the lens 73 side near the end U3. The subpixel B42 and the subpixel B61 have the same color, and the combined width projected on the lens plate 70 is equal to that of the subpixel (for example, G61 in the figure) projected alone.

  FIG. 8 is an enlarged view showing an example of an image obtained by viewing the image displayed on the liquid crystal panel 80 through the lens plate 70. Conceptually, the cross section taken along the line of sight T9-T10 in the drawing corresponds to the view shown in FIG. Lines A4, A5, and A6 are lines indicating the positions of the end portions of the lenses 71 to 74. Focusing on the vicinity of the line of sight T9-T10, the lens pitch direction of the lens plate 70 is inclined at an angle θ with respect to the column direction of the subpixels of the liquid crystal panel 80. A part of R51 is projected in the vicinity of the end U1. However, since the sub-pixel R32 and the sub-pixel R51 have the same color (red), red is continuously projected even if the projected sub-pixels are different.

  Further, a part of the subpixel B42 and a part of the subpixel B61 are projected in the vicinity of the end U3. However, since the sub-pixel B42 and the sub-pixel B61 have the same color (blue), blue is continuously displayed even if the sub-pixels displayed are different.

  Even if the positional relationship between the lens plate 70 and the liquid crystal panel 80 in FIG. 7 is shifted left and right, the combined width in which sub-pixels of the same color are projected on the lens plate 70 and the width in which a single sub-pixel is projected on the lens plate 70 are as follows. Always equal.

This is because the length of the range of the arrow Y1 in the figure is β + α + α + β = 2 (α + β). In this case, since the point Q _2B is taken so that α + β = 3 s (s; the width of the sub-pixel in the figure) (that is, the principal point / inter-screen distance d is determined), the length of the arrow Y1 is “6s”. Therefore, r3 + r5 = s, and the combined width of the images projected by r3 and r5 is equal to that by other subpixels. Further, r3 + r5 = s is maintained even when the range of the arrow Y1 is shifted left and right.

In this way, the lens plate 70 is arranged so that the end portion U2 is positioned on the boundary between the subpixel B42 and the subpixel R51, and the point Q _2B , that is, the subpixel range of the subpixel range on the liquid crystal panel 80 projected on the lens 72 is arranged. By setting the principal point / inter-screen distance d so that one end is located at the boundary between the sub-pixel B32 and the sub-pixel R42, the color of the sub-pixel is continuously projected in the vicinity of the end of each lens of the lens plate 70. be able to. When viewed as the entire screen, an image can be obtained in which straight stripes that are not jagged have the same width and are arranged obliquely.

  FIG. 9 is a diagram illustrating an example of an image displayed on the entire lens plate 70. Compared with the image projected on the lens plate 10 shown in FIG. 6, the colors of the sub-pixels are continuously projected in a straight line shape, and the jaggedness of the color boundary disappears. The width of the displayed stripe (color stripe) is (α / β) × cos θ from FIG. 7 when the width of the stripe (subpixel) of the original liquid crystal panel 80 is “1”. Since α <β and cos θ <1, since this value is smaller than “1”, the color fringes are not conspicuous even when compared with the state of the original liquid crystal panel 80. It is obvious that the quality of the image by the latter is higher in the image projected on the lens plate 10 shown in FIG. 6 and the image projected on the lens plate 70 shown in FIG.

  Therefore, a specific principal point / inter-screen distance d when the lens plate 70 is arranged on the liquid crystal panel 80 as shown in FIG. 7 is obtained. FIG. 10 is a plan view for explaining the positional relationship between the liquid crystal panel 80 and the lens plate 70. Lines A4, A5 and A6 in the figure are lines showing the positions of the end portions of the lenses 71 to 74. Lines C1 and C2 are lines indicating the centers of the lenses 72 and 73. The cross-sectional view taken along the arrow line T11-T12 corresponds to the view shown in FIG.

  Then, let P be the length in the column direction (pixel width for one pixel; also referred to as the pixel pitch in the column direction) of one pixel made up of three subpixels of RGB. Further, L is the ratio of the width of one microlens of the lens plate 80 parallel to the subpixel column direction to the pixel width of one pixel. That is, the width along the column direction of the sub-pixels of the microlens is L × P.

Hereinafter, the end U2 is located on the boundary between the subpixel B42 and the subpixel R51, and the point Q _2B , that is, the point indicating one end of the subpixel range on the liquid crystal panel 80 projected on the lens 72 is the subpixel B32. A case where the lens plate 70 is disposed so as to be located at the boundary between the sub-pixel R42 and the sub-pixel R42 will be described as an example.

At this time, if the distance of α and β is γ,
It becomes. Further, since the width along the column direction of the sub-pixels of the microlens is L × P, the lens pitch is LPcos θ. Therefore,
It becomes.

From FIG.
And
Is required.
Substituting equations (1) and (2) into equation (3),
It becomes.

Here, if the length in the column direction of each subpixel is “1”, the length in the column direction of three subpixels (1 pixel) including the subpixels R41, G41, and B41 is “3”. is there. Further, the width of each lens (L × P) along the sub-pixel column direction is 2.5 sub-pixels. Therefore,
Substituting this value of L and θ = 9.5 ° into equation (4),
It becomes. Therefore, by setting the distance d between the principal point and the screen to 2.47 times the focal length f, an image without color stripes as shown in FIG.

In the above description, the lens plate 70 is positioned so that the point Q _2B , that is, a point indicating one end of the subpixel range on the liquid crystal panel 80 projected on the lens 72 is located on the boundary between the subpixel B32 and the subpixel R42. Explained as placing.

  Next, as shown in FIG. 11A, the principal point / inter-screen distance d is set so that the point indicating one end of the sub-pixel range of the liquid crystal panel 80 projected on the lens 92 is located near the center of the sub-pixel G42. The case where it is set will be described. FIG. 11A shows an example of a cross-sectional view of the liquid crystal panel 80 and the lens plate 90 at this time.

  In FIG. 11A, a part of the sub-pixel B32 is projected on the lens 91. A part of the subpixel B42 and a part of the subpixel G42 are projected on the lens 92. However, a part of the sub-pixel B42 and a part of the sub-pixel G42 are displayed in an order in which the arrangement order in the liquid crystal panel 80 is changed. In addition, a part of the subpixel G51 and a part of the subpixel R51 are projected on the lens 93 in an order in which the arrangement order in the liquid crystal panel 80 is switched. A part of the sub-pixel R61 is projected on the lens 94.

  According to the figure, the subpixel B32 and the subpixel B42 are continuously projected with the end portion U4 therebetween. Similarly, the sub-pixel G42 and the sub-pixel G51, and the sub-pixel R51 and the sub-pixel R61 are continuously projected with the end portions U5 and U6 therebetween. In this way, sub-pixels of the same color are continuously projected at each end of the lens plate 90, and the combined width of these sub-pixels is always equal.

  The reason for this is that a continuous region of the same color to be projected is composed of two different subpixels (this is referred to as “two regions”) and three separate subpixels (this is referred to as “ This will be described in the case of “3 regions”.

In the case of “two regions”, the length of the range of the arrow Y2 in FIG. 11A is β + α + α + β = 2 (α + β). In this case, since the point Q _1B is taken so that α + β = 1.5 s (s; the width of the sub-pixel in the figure) (that is, the principal point / inter-screen distance d is determined), the length of the arrow Y2 The length is “3s”. Therefore, g4 + g5 = s. Further, even if the range of the arrow Y2 is shifted to the left and right, g4 + g5 = s is maintained.

  In the case of “3 regions”, as shown in FIG. 21 (the same sectional view as FIG. 11A), the length of the range of the arrow Y3 is 3 s, so b2 = b2 ′. Similarly, the length of the range of the arrow Y4 in FIG. 22 is b4 = b4 '. Therefore, as shown in FIG. 23, b2 + b3 + b4 = b2 ′ + b4 + b4 ′ = s. Further, b2 + b3 + b4 = s is maintained even if the range of the arrows Y3, Y4 is shifted to the left and right. As described above, in both cases of 2 areas and 3 areas, since the total width of the original areas to be projected is s, the combined width of the projected images is always equal.

  FIG. 12 is a diagram illustrating an example of an image obtained by viewing the image displayed on the liquid crystal panel 80 through the lens plate 90 in the state of FIG. Conceptually, the cross section taken along line T15-T16 in FIG. 12 corresponds to the view shown in FIG. Lines A7, A8 and A9 are lines indicating the positions of the end portions of the lenses 91 to 94.

  According to the figure, it can be seen that the colors of the sub-pixels are continuously projected at the ends of the lenses 91 to 94. Accordingly, the colors of the subpixels are not projected discontinuously across the ends of the lenses, and each color is displayed on the lens plate 90 according to the arrangement of the subpixels in the liquid crystal panel 80 as shown in FIG. Sub-pixels are projected in a straight line.

  Therefore, the principal point / inter-screen distance d when the lens plate 90 is arranged on the liquid crystal panel 80 as shown in FIG. FIG. 11B is a plan view for explaining the positional relationship between the liquid crystal panel 80 and the lens plate 90. Lines A7, A8, and A9 in the figure are lines showing the positions of the end portions of the lenses 91 to 94. Lines C3 and C4 are lines indicating the centers of the lenses 92 and 93. The sectional view taken along the arrow line T13-T14 corresponds to the diagram shown in FIG.

At this time, if the distance of α and β is γ,
It becomes.
Α is
And the relationship between α, β and d, f is
It becomes.
Substituting Equations (5) and (2) into Equation (3),
It becomes.

Here, substituting L = 5/6 and θ = 9.5 ° into the equation (6),
It becomes. Therefore, by setting the distance d between the principal point and the screen to 1.23 times the focal length f, as shown in FIG. 13, an image having no jagged edges at the color boundary can be displayed on the lens plate 90 as shown in FIG. Can do. However, in this case, the jaggedness of the color boundary is eliminated, but the width of the displayed stripe (color stripe) is larger than the width of the RGB stripe (subpixel) of the original liquid crystal panel, so it is recognized by human eyes. It becomes easy to be done. As a result, color fringes are more easily recognized than in the case of the above-mentioned principal point / inter-screen distance d = 2.47f.

As described above, when the lens plate 70 is arranged so that the point Q _2B , that is, a point indicating one end of the subpixel range on the liquid crystal panel 80 displayed on the lens 72 is located on the boundary between the subpixel B32 and the subpixel R42. And the point Q _1B , that is, the principal point / screen when the lens plate 90 is arranged so that the point indicating one end of the subpixel range on the liquid crystal panel 80 projected on the lens 92 is located at the center of the subpixel G42 The distance d has been described. As a result, the equations (4) and (6) were derived as the principal point / screen distance d.

Similarly, for example, an expression for obtaining the principal point / inter-screen distance d when one end of the sub-pixel range on the liquid crystal panel 80 projected on the lens 72 in FIG. 7 is located at the center of the sub-pixel G32, When a formula for obtaining the principal point / inter-screen distance d in the case of being located on the boundary of the sub-pixel adjacent to the sub-pixel R32 is derived, the general formula of the principal point / inter-screen distance d is:
It becomes. However, n is an integer of 1 or more.

  That is, FIG. 11 is a diagram showing the positional relationship between the liquid crystal panel and the lens plate when the lens plate is disposed at the position of the principal point / inter-screen distance d = 1.23f when n = 1 in Expression (7). FIG. 13A shows the image shown in FIG. 13 on the lens plate. FIG. 7 is a diagram showing the positional relationship between the liquid crystal panel and the lens plate when the lens plate is disposed at the position of the principal point / inter-screen distance d = 2.47f when n = 2 in Expression (7). The image shown in FIG. 9 is projected on the lens plate.

  In this way, when the lens pitch direction of the lens plate is inclined at an angle θ with respect to the column direction of the sub-pixels of the liquid crystal panel, by setting the principal point / inter-screen distance d according to the equation (7), It is possible to eliminate jagged color boundaries in a planar image projected on the lens plate.

  The principal point / inter-screen distance d is not strictly limited to the position obtained by the expression (7). In actual application, the same action and effect as the position specified by the expression are obtained. Of course, it may be in the vicinity of the position within the range where the performance is recognized.

  Here, it will be described how the effect of reducing a rough striped pattern is reduced when the principal point / inter-screen distance d slightly deviates from the position specified by the equation (7). For example, FIGS. 24 to 26 show (a) an original image projected by the lens plate under the respective conditions of the principal point / inter-screen distance d = 2.47f and the vicinity d = 2.27f and d = 2.67f. And (b) is a diagram showing a power spectrum obtained by two-dimensional Fourier transform of the R component of the original image (since the R, G, and B components are translationally symmetric images, the same power is applied to the G and B components as well. It becomes a spectrum.) As shown in FIGS. 24 to 26, when the principal point / screen distance d is slightly larger or smaller than the principal point / screen distance d = 2.47f according to the equation (7), the low frequency component It can be seen that increases. That is, it can be said that a rough striped pattern that is easily recognized by human eyes is beginning to stand out. Therefore, if this low-frequency component, that is, a rough striped pattern is within a range that is not noticeable by human eyes, the principal point / screen distance d is set in the vicinity of the position specified by Equation (7). You may do it.

  For example, FIGS. 27 and 28 show the case where the distance between the principal point and the screen distance d = 2.47f is shifted back and forth by ± 10% with respect to the focal length f, that is, FIG. 27 shows d = 2.37f. FIG. 28 is a diagram showing (a) an increase in the original image projected by the lens plate and (b) a power spectrum obtained by two-dimensional Fourier transform of the R component of the original image when 28 is d = 2.57f. It can be seen that there are fewer low frequency components and coarse stripes are less noticeable than in the case of d = 2.27f and d = 2.67f, respectively. Within this range, it can be said that almost the same effect as in the case where the distance d between the principal points and the screen is 2.47f is recognized.

When this range is expressed by a general formula, the following formula (8) is obtained.
nf / (Lcos ² θ) −0.1f ≦ d ≦ nf / (Lcos ² θ) + 0.1f
... (8)

  29 and 30 show the case where the principal point / inter-screen distance d = 2.47f is shifted back and forth by ± 5% with respect to the focal length f, that is, FIG. 29 shows d = 2.42f. FIG. 4 is a diagram showing (a) an increase in the original image projected by the lens plate and (b) a power spectrum obtained by two-dimensional Fourier transform of the R component of the original image when 30 is d = 2.52f. It can be seen that there are fewer low frequency components than in the case of d = 2.37f and d = 2.57f, respectively, and the rough striped pattern is less noticeable. In this range, it can be said that the same effect as that in the case where the principal point-to-screen distance d is 2.47f is recognized.

When this range is expressed by a general formula, the following formula (9) is obtained.
nf / (Lcos ² θ) −0.05f ≦ d ≦ nf / (Lcos ² θ) + 0.05f
... (9)

  Furthermore, from the viewpoint of adjusting the image quality according to preference, a distance that is larger or smaller than a value defined in accordance with Equation (7) may be used as the main point / inter-screen distance d. For example, by setting the distance smaller than the value defined by the equation as the principal point / inter-screen distance d, the contrast of the image can be adjusted in the increasing direction. This is particularly effective when d> 2f. Also, by setting the distance greater than the value defined by the above equation as the principal point / screen distance d, the resolution of the image can be increased when d <2f, and when d> 2f, the image resolution is increased. A soft screen can be obtained by utilizing the decrease in contrast.

  14 and 15 are diagrams showing images displayed on the lens plate when the character “play” is displayed on the liquid crystal panel. FIG. 14A shows a case where the principal point / screen distance d = 1.23f, and FIG. 14B shows a case where the principal point / screen distance d = 2f. FIG. 15A shows a principal point / screen distance d = 2.47f, and FIG. 15B shows a principal point / screen distance d which is the value of equation (7) when n = 3. = 3.70f image.

  Comparing the images shown in FIGS. 14 and 15, when the principal point-to-screen distance d = 2f, a jagged color boundary is generated, so that the spatial resolution of the human eye appears on the image displayed on the lens plate. The color fringes that can be captured in (in the upper left to the lower right of the screen) are generated in an oblique line shape. On the other hand, when the distance d between the principal point and the screen is set to 1.23f, 2.47f, and 3.70f, the jagged edges of the color boundary disappear, resulting in finer color stripes that are hard to be caught by the human eye. Can be increased.

  However, among the images with the principal point-to-screen distance d = 1.23f (FIG. 14A), 2.47f, 3.70f, d = 1.23f is the image quality (d = F), the number of subpixels projected on one lens is reduced, and the contrast is higher than in the case of d = 2.47f, but the resolution is lowered. As a result, the width of the RGB stripes to be projected is recognized by the human eye, resulting in an image with conspicuous color stripes. When d = 2.47f and d = 3.70f, the width of the projected RGB stripe is narrower than the original RGB stripe width of the liquid crystal, so that it is difficult to be recognized by the human eye and the image does not stand out. be able to. However, in the case of d = 3.70f (FIG. 15 (b)), the number of subpixels projected on one lens increases more than necessary, resulting in redundancy. Compared to the case of d = 2.47f. The contrast is lowered, and as a result, the display quality is lowered. Therefore, it can be said that d = 2.47f (FIG. 15A) is the optimum principal point / inter-screen distance.

  That is, when displaying a planar view image, by moving the lens plate to a position where the principal point / inter-screen distance d derived from the equation (7) becomes a value closest to 2f (in the above description, the principal point / screen By setting the distance d to 2.47f), almost all pixels of the liquid crystal panel can be recognized by the observer via the lens plate. That is, the image can be displayed on the lens plate without reducing the resolution of the image displayed on the liquid crystal panel.

  From the above, when the lens pitch direction of the lens plate is inclined at an angle θ with respect to the column direction of the sub-pixels of the liquid crystal panel, by setting the principal point / inter-screen distance d to a value closest to 2f, It is possible to prevent color stripes generated when displaying a planar image and display an image without deteriorating the quality of the planar image.

Further, among d satisfying the formula d = nf / (Lcos ² θ) (n is an arbitrary integer of 1 or more),
Compare the image quality closest to 2f without exceeding 2f and the image closest to 2f beyond 2f, and select the appropriate one depending on the characteristics of the image you want to display and whether priority is given to resolution or contrast. May be set. That is, depending on the characteristics of the image to be displayed, the principal point / inter-screen distance d may be a value next to the most recent value instead of the value nearest to 2f.

  Specifically, in the above-described case, the distance d between the principal point and the screen is not limited to d = 2.47f, which is a value closest to 2f. When d = 1.23f, which is smaller and 2f is the closest value, is set to increase the resolution and to smoothly display the gradation, d = 2.f which is greater than 2f and is the nearest value to 2f. 47f. (In this case, d = 2.47f is closer to 2f than d = 1.23f, but if d = 1.23f is closer to 2f, priority is given to "greater than 2f". D = 2.47f is adopted).

  Furthermore, as the value of d, there may be a case where it is better to adopt a larger value than “a value greater than 2f and closest to 2f”. For example, when the width of the original RGB stripes of the LCD is large enough to be recognized by human eyes, even if the lenticular lens is not attached, the image becomes conspicuous. In the case of a stereoscopic display in which a lenticular lens is attached to such an LCD, if the value of d following the planar image display is increased according to the equation (7), the contrast is sacrificed, but the width of the RGB stripe is reduced. As a result, the color stripes can be made inconspicuous.

  Note that the main point / inter-screen distance d is switched simultaneously with the display switching between the planar image and the stereoscopic screen on the liquid crystal panel. The switching method is based on the lens pitch direction of the lens plate with respect to the column direction of the sub-pixels of the liquid crystal panel. Any method may be used as long as the angle θ does not change before and after the switching of the principal point / screen distance d.

  As a method of switching the principal point / screen distance d, for example, the principal point / screen distance d is switched by moving the lens plate in a direction perpendicular to the upper surface of the liquid crystal panel (for example, upward in FIG. 7). There is a way. Further, the distance between the liquid crystal panel and the lens plate may be varied while the surfaces of the liquid crystal panel and the lens plate facing each other are held in parallel and the angle θ. Such a switching method of the principal point / inter-screen distance d can be realized by using a motor, a gear, a cam, or the like.

  Subsequently, an example in which the stereoscopic video display device of the present embodiment is applied to a small electronic device will be described below. FIG. 16 is an external view showing an example of the small electronic device 501. According to the figure, the housing 540 of the small electronic device 501 is provided with at least a display screen 510 and a plurality of input key groups 520 for a user to perform an operation input. That is, the user presses any key included in the input key group 520 to input a predetermined instruction and view an image displayed on the display screen 510. In addition, the small electronic device 501 includes a switching key 530 for the user to input switching between a planar image and a stereoscopic image.

  The display screen 510 includes the stereoscopic video display device 100 having a switching mechanism for changing the distance between the lens plate and the liquid crystal panel corresponding to the principal point / inter-screen distance d described above. Further, a protective glass is disposed in parallel with the upper surface of the lens plate. The user views an image displayed on the liquid crystal panel through the protective glass and the lens plate.

  The stereoscopic video display apparatus 100 obtains power from the drive system of the small electronic device 501 and changes the distance between the lens plate and the liquid crystal panel to switch between the stereoscopic view and the planar view. An image is displayed on the liquid crystal panel based on the image data input from the control system.

  That is, when the switch key 530 is pressed by the user, the small electronic device 501 switches the stereoscopic / planar view by driving the switching mechanism of the stereoscopic video display device 100 by the drive system, and further, the image is accompanied by the switching. The data is displayed on the liquid crystal panel by switching from the stereoscopic view to the planar view or from the planar view to the stereoscopic view.

  FIG. 17 is a diagram illustrating an example of a hardware configuration of the small electronic device 501 illustrated in FIG. 16. 17, in the small electronic device 501, a CPU 600, a RAM 610, a ROM 620, an information storage medium 630, an input device 640, an image generation IC 650, and a driving device 660 are connected to each other via a system bus 670 so as to be able to input and output data. . Note that the stereoscopic video display device 100 is connected to the image generation IC 650.

  The CPU 600 performs control of the entire apparatus, various data processing, switching processing described later, and the like according to programs, data, and the like stored in the ROM 620 or the information storage medium 630. The RAM 610 is a storage unit used as a work area of the CPU 600. For example, information input from the input device 640, calculation results by the CPU 600, programs and data read by the CPU 600 from the information storage medium 630, and the like are temporarily stored. Remember. The RAM 610 stores image information created by the CPU 600.

  The ROM 620 stores information necessary for starting up and operating the small electronic device 501 (for example, initialization information and information for controlling data transfer between devices connected via the system bus 670). Etc .; system programs) are stored. The information storage medium 630 also generates various image data to be displayed on the stereoscopic video display device 100, information (program data) for the CPU 600 to control the driving device 660, and causes the image generation IC 650 to generate image data. Information for outputting an instruction, information for the image generation IC to generate image data for a planar image and a stereoscopic image, and the like are stored. The information storage medium 630 can be realized by hardware such as an IC card, a memory, and a hard disk.

  The input device 640 includes an input key group 520 and a switching key 530 shown in FIG. 16, and is a device for detecting a pressing input by the user and outputting an identification signal attached to the pressed key to the CPU 600.

  The image generation IC 650 is an integrated circuit that generates image data to be output to the stereoscopic video display device 100 based on image information stored in the RAM 610, the ROM 620, the information storage medium 630, and the like. The stereoscopic video display device 100 controls the output of each subpixel of the liquid crystal panel based on the image data input from the image generation IC 650. The driving device 660 is a device that changes the distance between the lens plate and the liquid crystal panel in accordance with an instruction input from the CPU 600. For example, it is composed of a motor, gears and the like.

  Next, the operation of the small electronic device 501 will be described. FIG. 18 is a flowchart for explaining switching processing by the small electronic device 501.

  First, the CPU 600 determines a signal input from the input device 640 (step A1). That is, it is determined whether or not the switch key 530 has been pressed.

  When it is determined in step A1 that a planar view image is to be displayed (step A1: planar view), the CPU 600 outputs an instruction for realizing the planar view to the driving device 660. When an instruction to display a planar image is input from CPU 600, driving device 660 sets the distance between the lens plate and the liquid crystal panel to a distance for planar viewing (step A2). That is, the driving device 660 operates so that the distance between the lens plate and the liquid crystal panel is, for example, d = 2.47f.

  Further, the CPU 600 gives an instruction to the image generation IC 650 to generate image data for a planar view image. The image generation IC 650 generates image data for a planar view image in accordance with an instruction input from the CPU 600, and outputs and displays the image data on the stereoscopic video display device 100 (step A3). Here, the image data for a planar image is data for realizing a planar image without parallax like a general video image.

  On the other hand, when it is determined in step A1 that a stereoscopic image is displayed (step A1: stereoscopic vision), the CPU 600 outputs an instruction for realizing stereoscopic vision to the driving device 660. When an instruction to display a stereoscopic image is input from CPU 600, drive device 660 sets the distance between the lens plate and the liquid crystal panel to a distance for stereoscopic viewing (step A4). That is, the driving device 660 operates so that the distance between the lens plate and the liquid crystal panel is, for example, d = f.

  In addition, the CPU 600 outputs an instruction to generate image data for a stereoscopic image to the image generation IC 650. The image generation IC 650 generates stereoscopic image image data in accordance with an instruction input from the CPU 600, and outputs and displays it on the stereoscopic video display device 100 (step A5).

  Here, the image data for a stereoscopic image is obtained by synthesizing an image for each directivity direction in units of subpixels based on the positional relationship between each subpixel of the liquid crystal panel and each lens of the lens plate. That is, the image generation IC 650 generates image data for displaying information on an image corresponding to each directivity direction on each subpixel, and outputs the image data to the stereoscopic video display apparatus 100. The stereoscopic video display device 100 displays an image on the liquid crystal panel based on the image data input from the image generation IC 650.

  When the image is displayed on the stereoscopic video display device 100 (that is, the liquid crystal panel) in step A3 or step A5, the CPU 600 determines whether or not to end the display of the image (step A6). At this time, for example, when an instruction to change the image display is input from the input device 640, the process returns to step A1 and is repeated. On the other hand, when an instruction to end the display of an image, that is, an instruction to turn off the power is input from the input device 640, the process ends.

  In this way, by automatically switching between a stereoscopic image and a stereoscopic image in response to a user input, the convenience of the stereoscopic video display apparatus is improved and image display in various modes is possible. . Note that the electronic device having the stereoscopic video display device is not limited to the small electronic device as shown in FIG. 16, but a car navigation system screen, a television device, a home / business game device, a portable game device. , Display parts of pachinko machines and pachislot machines, mobile telephones, electronic notebooks, PDAs, digital cameras, electronic computers, electronic dictionaries, display parts of home appliances, etc. are considered. Is also applicable.

  For example, when the small electronic device 501 shown in FIGS. 16 and 17 is used as a game device, the game may be configured so that a planar image and a stereoscopic image are switched for each stage.

  In such a case, the CPU 600 determines whether the image is a planar image or a stereoscopic image every time the game stage is switched. When realizing a planar view image, an instruction is given to the driving device 600 to set the distance between the lens plate and the liquid crystal panel as a distance for the planar view. On the other hand, when realizing a stereoscopic video, an instruction is given to the driving device 600 to set the distance between the lens plate and the liquid crystal panel as a stereoscopic vision distance. As described above, the distance between the lens plate and the liquid crystal panel may be changed according to the code attached to the image data, the program, or the like, or the processing state based on the given program, regardless of the user input.

  Of course, the above-described stereoscopic video display apparatus may be used independently as well as the small electronic device 501 as shown in FIG. For example, it may be used as a display connected to a personal computer, a home game device, or the like, and a video display device connected to a video playback device such as a DVD player, a video camera, or the like. In this case, a driving device for translating the lens plate may be incorporated in the main body of the stereoscopic video display device, and may be translated in response to a user input or an input signal from a computer or the like.

  FIG. 19 is a front view showing an example of a stereoscopic video display device 700 having a built-in switching mechanism driving device. As shown in the figure, the stereoscopic video display device 700 includes a display screen 710, an outer frame 720, a switching button 730, and a pedestal 740. The switching button 730 is provided on the outer frame 720, and when the user presses the switching button 730, the switching mechanism is driven by a built-in driving device to change the distance between the lens plate and the liquid crystal panel.

  19 includes a power connector (not shown) for connecting to a power source, and is connected to the power source via a cable 750. That is, the stereoscopic video display device 700 is operated by electric power supplied from the power source via the cable 750.

  The stereoscopic video display apparatus 700 has a connector (not shown) for connecting to an external device such as a PC, and is connected to the external device by a cable 760. That is, the stereoscopic video display device 700 displays image data input from an external device via the cable 760 on the liquid crystal panel. In addition, the stereoscopic video display device 700 includes a cable 770 for outputting a signal indicating that the switching button 730 has been pressed to an external device or receiving a signal indicating that the driving device 840 is activated from the external device. .

  FIG. 20 is a diagram illustrating an example of a hardware configuration of the stereoscopic video display apparatus 700 illustrated in FIG. As shown in the figure, the stereoscopic video display device 700 includes a display unit 800 including a lens plate 802 and a liquid crystal panel 804, a display control device 810 that controls display on the liquid crystal panel 804, and an image connected to an external device. An input I / O 820, a switching mechanism 830 for switching the distance between the lens plate and the liquid crystal panel, a driving device 840 for driving the switching mechanism 830, an operation control device 850 for controlling the driving device 840, an external A control I / O 860 connected to the apparatus and a switching button 730 are provided.

  The display control device 810 controls display on the liquid crystal panel 804 based on image data input from an external device via the image input I / O 820. The drive device 840 is a device that drives the switching mechanism 830 in accordance with an instruction input from the operation control device 850, and is realized by, for example, a motor or a gear.

  The operation control device 850 is a device that controls the operation of the drive device 840. When the drive device 840 is configured by a motor, a gear, or the like, the operation control device 850 instructs the drive device 840 of the rotation amount or the rotation direction of the motor or gear.

  In addition, the operation control device 850 operates the drive device 840 in response to a signal input from the switching button 730 and determines whether the stereoscopic video display device 700 is in a planar image display state or a stereoscopic image display state. It generates and outputs a notification signal for notifying an external device of whether or not.

  More specifically, the operation control device 850 generates a notification signal based on the operation state of the drive device 840 and outputs the notification signal to an external device via the control I / O 860. For example, when the switching mechanism is driven by a motor, a notification signal corresponding to the amount of rotation of the motor and the presence or absence of rotation is generated. In this way, an instruction to change the type of image (planar image / stereoscopic image) is output to the external device according to the distance between the lens plate and the liquid crystal panel, that is, according to the operating state of the driving device 840.

  In addition, the stereoscopic video display device 700 not only switches between a planar image and a display state of the stereoscopic image in response to an input of the switching button 730, but also in accordance with an instruction input from the connected external device. Switch between a visual image and a stereoscopic image. In other words, the operation control device 850 operates the driving device 840 in response to a signal input from an external device connected via the control I / O 860. According to such a configuration, it is possible to operate the driving device 840 in accordance with an instruction input from an external device, and to switch between a planar view image and a stereoscopic view image.

  Incidentally, an electronic device (that is, an external device) that is connected to the stereoscopic video display device 700 shown in FIG. 19 and outputs image data is at least a CPU as in the hardware configuration of the small electronic device 501 shown in FIG. A RAM, a ROM, an information storage medium, an input device, an image generation IC, and a connector for connecting the stereoscopic video display device 700. The image generation IC generates image data according to an instruction input from the CPU, and outputs the image data to the stereoscopic video display device 700 via the connector.

  However, when generating the image data, the electronic device generates the image data by switching between the planar image and the stereoscopic image in response to the notification signal input from the stereoscopic video display device 700. That is, the CPU determines whether the image is a planar image or a stereoscopic image based on the notification signal input from the stereoscopic video display device 700, and causes the image generation IC to generate image data based on the determination result.

  Also, the electronic device connected to the stereoscopic video display device 700 transmits an instruction signal for instructing whether or not to switch the distance between the lens plate and the liquid crystal panel to the stereoscopic video display device 700 when transmitting image data. It may be configured to output. As a method of outputting an instruction signal instructing switching of the distance between the lens plate and the liquid crystal panel, it may be performed in response to a user input, or based on data or a program stored in a ROM or an information storage medium. Also good. Or you may carry out according to the processing result based on the signal input from a given program and an input device.

  Note that the electronic device connected to the stereoscopic video display apparatus 700 may be an apparatus that performs an operation only for outputting image data to the stereoscopic video display apparatus 700. For example, there are two types of image data, that is, image data for a stereoscopic image and image data for a stereoscopic image, and the type of image data to be output in response to a signal input from the stereoscopic video display device 700 is selected. It may be configured to switch.

  As for the distance d between the display panel and the lens plate when displaying a planar view image (2D image), select an appropriate one according to the content of the video to be displayed and the purpose of use. It ’s fine.

FIG. 3 is a vertical cross-sectional view with respect to the display surface of a twin-lens stereoscopic image display device. The figure for demonstrating the difference between the position which looks at a lens board, and the visible sub pixel. The figure for demonstrating an image when seeing a two-eye type stereoscopic vision video display apparatus with a right eye. The top view of a liquid crystal panel, and sectional drawing when a lens board is arrange | positioned above a liquid crystal panel. The figure which shows an example of the image | video which the lens plate projected the image displayed on the liquid crystal panel. The figure which shows an example of the image | video which the lens plate projected the image displayed on the liquid crystal panel. Sectional drawing when arrange | positioning a lens board above a liquid crystal panel. The figure which shows an example of the image | video which the lens plate projected the image displayed on the liquid crystal panel. The figure which shows an example of the image | video which the lens plate projected the image displayed on the liquid crystal panel. The top view of a liquid crystal panel. Sectional drawing when arrange | positioning a lens board above a liquid crystal panel, and the top view of a liquid crystal panel. The figure which shows an example of the image | video which the lens plate projected the image displayed on the liquid crystal panel. The figure which shows an example of the image | video which the lens plate projected the image displayed on the liquid crystal panel. The figure which shows an example of the image | video which the lens plate projected the image displayed on the liquid crystal panel. The figure which shows an example of the image | video which the lens plate projected the image displayed on the liquid crystal panel. FIG. 6 is an external view illustrating an example of a housing of a small electronic device. The figure which shows an example of the hardware constitutions of a small electronic device. The flowchart for demonstrating the switching process by a small electronic device. The front view which shows an example of the stereoscopic vision video display apparatus incorporating the drive device for moving a lens plate. The figure which shows an example of the hardware constitutions of the stereoscopic vision video display apparatus shown in FIG. Sectional drawing for demonstrating the reason that the synthetic | combination width | variety of a subpixel becomes equal when the subpixel of the same color is projected continuously (the 1). Sectional drawing for demonstrating the reason that the synthetic | combination width | variety of a subpixel becomes equal when the subpixel of the same color is projected continuously (the 2). Sectional drawing for demonstrating the reason that the synthetic | combination width | variety of a subpixel becomes equal when the subpixel of the same color is projected continuously (the 3). The figure which shows (a) the original image which a lens plate projects in the distance d = 2.47f between principal points and screens, and (b) the power spectrum. The figure which shows the (a) original image which a lens plate reflects in the principal point-screen distance d = 2.27f, and (b) the power spectrum. The figure which shows the (a) original image which a lens plate projects in the distance d = 2.67f between principal points and screens, and (b) the power spectrum. The figure which shows the (a) original image which a lens plate projects in the distance d = 2.37f between principal points and screens, and (b) the power spectrum. The figure which shows the (a) original image which a lens plate reflects in the distance d = 2.57f between principal points and screens, and (b) the power spectrum. The figure which shows (a) the original image which a lens plate projects in the distance d = 2.42f between principal points and screens, and (b) the power spectrum. The figure which shows the (a) original image which a lens plate reflects in the distance d = 2.52f between principal points and screens, and (b) the power spectrum.

Explanation of symbols

10, 70, 90 Lens plate 20, 80 Liquid crystal panel 12 Backlight 100 Stereoscopic image display device 501 Small electronic device 510 Display screen 520 Input key group 530 Switching key 540 Case 600 CPU
610 RAM
620 ROM
630 Information storage medium 640 Input device 650 Image generation IC
660 Drive device 670 System bus

Claims (13)

A display panel in which subpixels are arranged in a predetermined order in the row direction and the column direction, a lens plate of a lenticular lens in which the lens pitch direction is obliquely arranged with respect to the column direction of the display panel, and for stereoscopic display A stereoscopic image provided with distance changing means for changing the distance between the display panel and the lens plate by moving the lens plate to at least two positions of the first position and the second position for planar display. A display device,
The second position is a ratio of a lens width of one microlens of the lens plate along the column direction of the display panel to a pixel width of one pixel of the display panel, and the ratio of the lens width to the column direction of the display panel. When the angle of the lens pitch direction of the lens plate is θ and the focal length of each microlens on the lens plate is f, the distance d between the display surface of the display panel and the principal point of the microlens of the lens plate is:
d = nf / (Lcos ² θ) (n is an arbitrary integer of 1 or more)
A stereoscopic image display device characterized by being at a position of A display panel in which subpixels are arranged in a predetermined order in the row direction and the column direction, a lens plate of a lenticular lens in which the lens pitch direction is obliquely arranged with respect to the column direction of the display panel, and for stereoscopic display A stereoscopic image provided with distance changing means for changing the distance between the display panel and the lens plate by moving the lens plate to at least two positions of the first position and the second position for planar display. A display device,
The second position is a ratio of a lens width of one microlens of the lens plate along the column direction of the display panel to a pixel width of one pixel of the display panel, and the ratio of the lens width to the column direction of the display panel. When the angle of the lens pitch direction of the lens plate is θ and the focal length of each microlens on the lens plate is f, the distance d between the display surface of the display panel and the principal point of the microlens of the lens plate is:
nf / (Lcos ² θ) −0.05f ≦ d ≦ nf / (Lcos ² θ) + 0.05f
(N is an arbitrary integer of 1 or more)
A stereoscopic image display device characterized by being at a position of A display panel in which subpixels are arranged in a predetermined order in the row direction and the column direction, a lens plate of a lenticular lens in which the lens pitch direction is obliquely arranged with respect to the column direction of the display panel, and for stereoscopic display A stereoscopic image provided with distance changing means for changing the distance between the display panel and the lens plate by moving the lens plate to at least two positions of the first position and the second position for planar display. A display device,
The second position is a ratio of a lens width of one microlens of the lens plate along the column direction of the display panel to a pixel width of one pixel of the display panel, and the ratio of the lens width to the column direction of the display panel. When the angle of the lens pitch direction of the lens plate is θ and the focal length of each microlens on the lens plate is f, the distance d between the display surface of the display panel and the principal point of the microlens of the lens plate is:
nf / (Lcos ² θ) −0.1f ≦ d ≦ nf / (Lcos ² θ) + 0.1f
(N is an arbitrary integer of 1 or more)
A stereoscopic image display device characterized by being at a position of The stereoscopic video display device according to any one of claims 1 to 3,
The stereoscopic video display device, wherein the second position is a position where d is a value closest to 2f. The invention according to any one of claims 1 to 3,
The stereoscopic image display apparatus according to claim 2, wherein the second position is a position where d is a value smaller than 2f and a value closest to 2f. The invention according to any one of claims 1 to 3,
The stereoscopic image display apparatus according to claim 2, wherein the second position is a position where d is a value greater than 2f and a value closest to 2f. The stereoscopic video display device according to any one of claims 1 to 6,
A stereoscopic video display apparatus, further comprising a driving unit that drives the distance changing unit according to a driving signal input from the outside. The stereoscopic video display device according to any one of claims 1 to 6,
An output means for outputting a notification signal corresponding to the operating state of the distance changing means to an external device;
A stereoscopic video display device comprising: A stereoscopic video display device according to claim 7;
Image control means for switching between stereoscopic image information and planar image information and outputting to the stereoscopic video display device;
Instruction output means for outputting a drive signal for driving the drive means in conjunction with switching of the output image of the image control means;
An electronic device comprising: An electronic device connected to the stereoscopic video display device according to claim 8,
An electronic apparatus comprising: an image control unit that switches and generates stereoscopic image information and planar image information according to a notification signal output from the output unit, and outputs the information to the stereoscopic video display device. machine. A stereoscopic view including a display panel in which sub-pixels are arranged in a predetermined order in the row direction and the column direction, and a lens plate of a lenticular lens in which a lens pitch direction is arranged obliquely with respect to the column direction of the display panel A planar view display method in a video display device,
The ratio of the lens width for one microlens of the lens plate along the column direction of the display panel to the pixel width for one pixel of the display panel is L, and the lens pitch direction of the lens plate with respect to the column direction of the display panel Is the angle d, and the focal length of each microlens on the lens plate is f, the distance d between the display surface of the display panel and the lens principal point of the lens plate is:
d = nf / (Lcos ² θ) (n is an arbitrary integer of 1 or more)
A planar view display method in a stereoscopic video display apparatus that performs planar display by moving the lens plate to the position. A stereoscopic view including a display panel in which sub-pixels are arranged in a predetermined order in the row direction and the column direction, and a lens plate of a lenticular lens in which a lens pitch direction is arranged obliquely with respect to the column direction of the display panel A planar view display method in a video display device,
The ratio of the lens width for one microlens of the lens plate along the column direction of the display panel to the pixel width for one pixel of the display panel is L, and the lens pitch direction of the lens plate with respect to the column direction of the display panel Is the angle d, and the focal length of each microlens on the lens plate is f, the distance d between the display surface of the display panel and the lens principal point of the lens plate is:
nf / (Lcos ² θ) −0.05f ≦ d ≦ nf / (Lcos ² θ) + 0.05f
(N is an arbitrary integer of 1 or more)
A planar view display method in a stereoscopic video display apparatus that performs planar display by moving the lens plate to the position. A stereoscopic view including a display panel in which sub-pixels are arranged in a predetermined order in the row direction and the column direction, and a lens plate of a lenticular lens in which a lens pitch direction is arranged obliquely with respect to the column direction of the display panel A planar view display method in a video display device,
The ratio of the lens width for one microlens of the lens plate along the column direction of the display panel to the pixel width for one pixel of the display panel is L, and the lens pitch direction of the lens plate with respect to the column direction of the display panel Is the angle d, and the focal length of each microlens on the lens plate is f, the distance d between the display surface of the display panel and the lens principal point of the lens plate is:
nf / (Lcos ² θ) −0.1f ≦ d ≦ nf / (Lcos ² θ) + 0.1f
(N is an arbitrary integer of 1 or more)
A planar view display method in a stereoscopic video display apparatus that performs planar display by moving the lens plate to the position.