JP4968655B2 - Stereoscopic image display device, portable terminal device - Google Patents

Description

The present invention is a stereoscopic image display device capable of displaying a stereoscopic image, related to the mobile terminal equipment equipped with it, in particular, not only the one direction a stereoscopic image display device to another in a direction orthogonal to the one direction stereoscopic even when disposed capable stereoscopic image display device relates to a portable terminal equipment.

  Conventionally, a display device capable of displaying a stereoscopic image has been studied. In 280 BC, Greek mathematician Euclid considers that "stereoscopicity is the sense that the left and right eyes simultaneously see different images viewed from different directions of the same object" (for example, Non-patent document 1 (Chihiro Masuda, published by Sangyo Tosho Co., Ltd. “3D Display”). That is, as a function of the stereoscopic image display device, it is necessary to present images with parallax to both the left and right eyes.

  As a method for concretely realizing this function, many stereoscopic image display methods have been studied for some time. These methods can be roughly divided into a method using glasses and a method using no glasses. Among these, there are anaglyph methods that use the difference in color and polarized glasses methods that use polarized light, etc., but in recent years, the inconvenience of wearing glasses cannot be avoided. A method without glasses that does not use glasses has been actively studied. Examples of the method without glasses include a lenticular lens method and a parallax barrier method.

  First, the lenticular lens method will be described. The lenticular lens system was invented around 1910 by Ives et al., For example, as described in Non-Patent Document 1 described above. FIG. 29 is a perspective view showing a lenticular lens, and FIG. 30 is an optical model diagram showing a stereoscopic image display method using the lenticular lens. As shown in FIG. 29, one surface of the lenticular lens 121 is a flat surface, and the other surface has a semi-cylindrical convex portion (cylindrical lens 122) extending in one direction, and the longitudinal directions thereof are parallel to each other. A plurality are formed so as to be.

  As shown in FIG. 30, in the lenticular lens type stereoscopic image display device, a lenticular lens 121, a display panel 106, and a light source 108 are arranged in this order from the viewer side, and are displayed on the focal plane of the lenticular lens 121. The pixel of panel 106 is located. In the display panel 106, pixels 123 that display an image for the right eye 141 and pixels 124 that display an image for the left eye 142 are alternately arranged. At this time, a group of pixels 123 and 124 adjacent to each other corresponds to each cylindrical lens (convex portion) 122 of the lenticular lens 121. Thereby, the light emitted from the light source 108 and transmitted through each pixel is distributed in the direction toward the left and right eyes by the cylindrical lens 122 of the lenticular lens 121. As a result, it is possible to cause the left and right eyes to recognize different images, and to allow the observer to recognize a stereoscopic image. As described above, the method of displaying the image for the left eye and the image for the right eye for each eye and allowing the observer to recognize the stereoscopic image is called a two-viewpoint method in order to form two viewpoints. .

  Next, the size of each part of a stereoscopic image display device including a normal lenticular lens and a display panel will be described in detail. FIG. 31 is a diagram showing an optical model of a normal lenticular lens type binocular stereoscopic image display device, and FIG. 32 is a diagram showing a stereoscopic visible range of this binocular stereoscopic image display device. As shown in FIG. 31, the distance between the vertex of the lenticular lens 121 and the pixel of the display panel 106 is H, the refractive index of the lenticular lens 121 is n, the focal length is f, and the lens element array period, that is, Let the lens pitch be L. In the display pixels of the display panel 106, one left-eye pixel 124 and one right-eye pixel 123 are arranged as a set. Let P be the pitch of this pixel. Therefore, the arrangement pitch of the display pixels each including the left-eye pixel 124 and the right-eye pixel 123 is 2P. One cylindrical lens 122 is arranged corresponding to each of the two display pixels of the left eye pixel 124 and the right eye pixel 123.

The distance between the lenticular lens 121 and the observer is the optimum observation distance OD, and the enlarged projection width of the pixel at this distance OD, that is, the pixel for the left eye on a virtual plane that is separated from the lens by the distance OD and parallel to the lens. The widths of the projected images 124 and the right-eye pixel 123 are each e. Furthermore, from the center of the cylindrical lens 122 located in the center of the lenticular lens 121, the distance to the center of the cylindrical lens 122 located at the end of the lenticular lens 121 in the horizontal direction 112 and W _L, located in the center of the display panel 106 and the center of the display pixels comprising a left-eye pixels 124 and right eye pixels 123, the distance between the center of the display pixels located at the edge of the display panel 106 in the horizontal direction 112 and W _P. Furthermore, the incident angle and the exit angle of the light in the cylindrical lens 122 located at the center of the lenticular lens 121 are α and β, respectively, and the incident angle of the light in the convex portion 122 located at the end of the lenticular lens 121 in the lateral direction 112 and Let the outgoing angles be γ and δ, respectively. Furthermore, the distance W the difference between _L and the distance W _P is C, the distance W number of pixels contained in the area of _P is referred to as the 2m.

  Since the arrangement pitch L of the cylindrical lenses 122 and the arrangement pitch P of the pixels are related to each other, the other is determined according to one, but usually the lenticular lens is often designed according to the display panel. Therefore, the pixel arrangement pitch P is treated as a constant. Further, the refractive index n is determined by selecting the material of the lenticular lens 121. On the other hand, the observation distance OD between the lens and the observer, and the pixel enlargement projection width e at the observation distance OD are set to desired values. These values are used to determine the distance H and lens pitch L between the vertex of the lens and the pixel. From Snell's law and geometrical relationships, the following formulas 1 to 6 hold. Also, the following formulas 7 to 9 are established.

  From the above formulas 1 to 3, the following formulas 10 to 12 are established, respectively.

  Further, the following formula 13 is established from the above formulas 6 and 9. Further, from the above formulas 8 and 9, the following formula 14 is established. Furthermore, from the above formula 5, the following formula 15 is established.

  Usually, in order to make the distance H between the vertex of the lenticular lens and the pixel equal to the focal length f of the lenticular lens, the following mathematical formula 16 is established, and when the curvature radius of the lens is r, the curvature radius r is It can be obtained from Equation 17.

  As shown in FIG. 32, an area where light from all the right eye pixels 123 reaches is a right eye area 171, and an area where light from all the left eye pixels 124 reaches is a left eye area 172. The observer can recognize a stereoscopic image by positioning the right eye 141 in the right eye region 171 and the left eye 142 in the left eye region 172. However, since the observer's binocular interval is constant, the right eye 141 and the left eye 142 cannot be placed at arbitrary positions in the right eye region 171 and the left eye region 172, respectively, and the binocular interval is maintained at a constant value. It is limited to the area that can. That is, stereoscopic vision is possible only when the midpoint of the right eye 141 and the left eye 142 is located in the stereoscopic visibility range 107. At the position where the distance from the display panel 106 is the optimal observation distance OD, the length along the horizontal direction 112 in the stereoscopic view area 107 is the longest, and thus the tolerance when the position of the observer is shifted in the horizontal direction 112. Is the maximum. For this reason, the position where the distance from the display panel 106 is the optimum observation distance OD is the most ideal observation position.

  As will be described later, the parallax barrier method is a method of “hiding” unnecessary light rays by the barrier, whereas the lenticular lens method is a method of changing the direction of light travel, and in principle it is displayed by providing a lenticular lens. There is no decrease in screen brightness. For this reason, application to portable devices and the like where high luminance display and low power consumption performance are particularly important is considered promising.

  An example of developing a stereoscopic image display device using a lenticular lens system is described in, for example, Non-Patent Document 2 (Nikkei Electronics No. 838, issued on January 6, 2003, pages 26 to 27). The liquid crystal display panel constituting the stereoscopic image display device has a 7-inch diagonal size and a display dot number of 800 dots wide × 480 dots wide. By changing the distance between the lenticular lens and the liquid crystal display panel by 0.6 mm, the stereoscopic image display and the flat display can be switched. The number of viewpoints in the horizontal direction is 5. If the angle is changed in the horizontal direction, five different images can be seen. Since the number of viewpoints in the vertical direction is 1, the image does not change even if the angle is changed in the vertical direction.

  Next, the parallax barrier method will be described. The parallax barrier method was conceived by Berthier in 1896 and demonstrated by Ives in 1903. FIG. 33 is an optical model diagram showing a stereoscopic image display method using a parallax barrier. As shown in FIG. 33, the parallax barrier 105 is a barrier (light-shielding plate) in which a large number of thin vertical stripes, that is, slits 105a are formed. A display panel 106 is disposed in the vicinity of one surface of the parallax barrier 105. In the display panel 106, the right-eye pixels 123 and the left-eye pixels 124 are arranged in a direction orthogonal to the longitudinal direction of the slits. A light source 108 is disposed in the vicinity of the other surface of the parallax barrier 105, that is, on the opposite side of the display panel 106.

  Light that is emitted from the light source 108, passes through the opening (slit 105 a) of the parallax barrier 105, and passes through the right-eye pixel 123 becomes a light beam 181. Similarly, light emitted from the light source 108, passing through the slit 105 a, and passing through the left eye pixel 124 becomes a light beam 182. At this time, the position of the observer who can recognize the stereoscopic image is determined by the positional relationship between the parallax barrier 105 and the pixels. In other words, the right eye 141 of the observer 104 is in the pass band of all the light beams 181 corresponding to the plurality of right eye pixels 123, and the left eye 142 of the observer is in the pass band of all the light beams 182. It will be necessary. This is a case where the midpoint 143 of the observer's right eye 141 and left eye 142 is located within the rectangular stereoscopic visible region 107 shown in FIG. 33 in FIG.

  Among the line segments extending in the arrangement direction of the right-eye pixel 123 and the left-eye pixel 124 in the stereoscopic viewable area 107, the line segment that passes through the intersection 107a of the diagonal lines in the stereoscopic viewable area 107 is the longest line segment. For this reason, when the middle point 143 is located at the intersection 107a, the tolerance when the position of the observer is shifted in the left-right direction is maximized, and thus the observation position is most preferable. Therefore, in this stereoscopic image display method, the distance between the intersection 107a and the display panel 106 is set as the optimum observation distance OD, and it is recommended to the observer to observe at this distance. A virtual plane in which the distance from the display panel 106 in the stereoscopic visible range 107 is the optimum observation distance OD is referred to as an optimum observation surface 107b. As a result, light from the right eye pixel 123 and the left eye pixel 124 reaches the observer's right eye 141 and left eye 142, respectively. Therefore, the observer can recognize the image displayed on the display panel 106 as a stereoscopic image.

  Next, the size of each part of the stereoscopic image display apparatus in which a parallax barrier having slit-like openings formed on the front surface of the display panel is arranged will be described in detail. FIG. 34 is a diagram showing an optical model of a binocular stereoscopic image display device provided with a slit-like parallax barrier on the viewer side of the display panel. For convenience of explanation, it is assumed that the opening width of the parallax barrier is very small and can be ignored. As shown in FIG. 34, the arrangement pitch of the slits 105 a of the parallax barrier 105 is L, and the interval between the display panel 106 and the parallax barrier 105 is H. Further, P is an arrangement pitch of pixels. As described above, in the display panel 106, two pixels, that is, each one of the right-eye pixel 123 and the left-eye pixel 124 are arranged as a set of pixel groups. The arrangement pitch of is 2P. Since the arrangement pitch L of the slits 105a and the arrangement pitch P of the pixel groups are related to each other, the other is determined according to one, but it is usually possible to design a parallax barrier according to the display panel. Since there are many, the pixel arrangement pitch P is treated as a constant.

  Further, an area where light from all the right eye pixels 123 reaches is a right eye area 171, and an area where light from all the left eye pixels 124 reaches is a left eye area 172. An observer can recognize a stereoscopic image by positioning the right eye 141 in the right eye region 171 and the left eye 142 in the left eye region 172. However, since the observer's binocular interval is constant, the right eye 141 and the left eye 142 cannot be placed at arbitrary positions in the right eye region 171 and the left eye region 172, respectively, and the binocular interval is maintained at a constant value. It is limited to the area that can. That is, stereoscopic vision is possible only when the midpoint 143 of the right eye 141 and the left eye 142 is located in the stereoscopic visibility range 107. At the position where the distance from the display panel 106 is the optimal observation distance OD, the length along the horizontal direction 112 in the stereoscopic view area 107 is the longest, and thus the tolerance when the position of the observer is shifted in the horizontal direction 112. Is the maximum. For this reason, the position where the distance from the display panel 106 is the optimum observation distance OD is the most ideal observation position. A virtual plane in which the distance from the display panel 106 in the stereoscopic visible range 107 is the optimum observation distance OD is defined as the optimum observation surface 107b. Further, e is an enlarged projection width of one pixel on the optimum observation surface 107b.

  Next, the distance H between the parallax barrier 105 and the pixel of the display panel 106 is determined using the above-described values. From the geometrical relationship shown in FIG. 34, the following formula 18 is established, and as a result, the interval H is obtained as shown in the following formula 19.

Furthermore, the center of the pixel group positioned at the center in the transverse direction 112 of the display panel 106, the distance between the center of the pixel group positioned at an end and W _P in the horizontal direction 112, corresponding respectively to these pixels When the distance between the centers of the slits 105a and _{W L,} a difference C between the distance _{W P} and the distance _{W L} is given by the following equation 20. Further, the number of pixels included in the distance W _P in the display panel 106 When the 2m, following equation 21 is established. Furthermore, since the following mathematical formula 22 holds from the geometrical relationship, the pitch L of the slits 105a of the parallax barrier 105 is given by the following mathematical formula 23.

  Next, the size of each part will be described in detail with respect to a stereoscopic image display device provided with a parallax barrier on the back surface of the display panel. FIG. 35 is a diagram showing an optical model of a twin-lens stereoscopic image display device having a slit-like parallax barrier on the back surface of the display panel. For convenience of explanation, it is assumed that the opening width of the parallax barrier is very small and can be ignored. As in the case where the parallax barrier is disposed on the front surface of the display panel described above, the arrangement pitch of the slits 105a of the parallax barrier 105 is L, and the interval between the display panel 106 and the parallax barrier 105 is H. . Further, P is an arrangement pitch of pixels. As described above, in the display panel 106, two pixels, that is, each one of the right-eye pixel 123 and the left-eye pixel 124 are arranged as a set of pixel groups. The arrangement pitch of is 2P. Since the arrangement pitch L of the slits 105a and the arrangement pitch P of the pixel groups are related to each other, the other is determined according to one, but it is usually possible to design a parallax barrier according to the display panel. Since there are many, the pixel arrangement pitch P is treated as a constant.

  Further, an area where light from all the right eye pixels 123 reaches is a right eye area 171, and an area where light from all the left eye pixels 124 reaches is a left eye area 172. An observer can recognize a stereoscopic image by positioning the right eye 141 in the right eye region 171 and the left eye 142 in the left eye region 172. However, since the observer's binocular interval is constant, the right eye 141 and the left eye 142 cannot be placed at arbitrary positions in the right eye region 171 and the left eye region 172, respectively, and the binocular interval is maintained at a constant value. It is limited to the area that can. That is, stereoscopic vision is possible only when the midpoint 143 of the right eye 141 and the left eye 142 is located in the stereoscopic visibility range 107. At the position where the distance from the display panel 106 is the optimal observation distance OD, the length along the horizontal direction 112 in the stereoscopic view area 107 is the longest, and thus the tolerance when the position of the observer is shifted in the horizontal direction 112. Is the maximum. For this reason, the position where the distance from the display panel 106 is the optimum observation distance OD is the most ideal observation position. Furthermore, a virtual plane in which the distance from the display panel 106 in the stereoscopic visible region 107 is the optimum observation distance OD is defined as the optimum observation surface 107b. Further, e is an enlarged projection width of one pixel on the optimum observation surface 107b.

  Next, the distance H between the parallax barrier 105 and the pixel of the display panel 106 is determined using the above-described values. From the geometrical relationship shown in FIG. 35, the following formula 24 is established, and as a result, the interval H is obtained as shown in the following formula 25.

Furthermore, the center of the pixel group positioned at the center in the transverse direction 112 of the display panel 106, the distance between the center of the pixel group positioned at an end and W _P in the horizontal direction 112, corresponding respectively to these pixels When the distance between the centers of the slits 105a and _{W L,} a difference C between the distance _{W P} and the distance _{W L} is given by the following equation 26. Further, the number of pixels included in the distance W _P on the display panel 6 When the 2m, following equations 27 and equations 28 is established. Furthermore, since the following mathematical formula 29 holds from the geometrical relationship, the pitch L of the slits 105a of the parallax barrier 105 is given by the following mathematical formula 30.

  When the parallax barrier method was originally devised, the parallax barrier was disposed between the pixels and the eyes, which was problematic because it was unsightly and low in visibility. However, with the recent realization of the liquid crystal display panel, the parallax barrier 105 can be disposed on the back side of the display panel 106 as shown in FIG. For this reason, a parallax barrier type stereoscopic image display device has been actively studied.

  Examples actually produced using the parallax barrier method are described in Table 1 of Non-Patent Document 2 described above. This is a mobile phone equipped with a 3D-compatible liquid crystal panel, and the liquid crystal display panel constituting the stereoscopic image display device has a diagonal size of 2.2 inches and a display dot number of 176 (horizontal) × 220 (vertical) dots. Have. A liquid crystal panel for a switch for turning on / off the effect of the parallax barrier is provided, and a stereoscopic image display and a planar image display can be switched and displayed. At the time of displaying a stereoscopic image, two images of a left eye image and a right eye image are displayed as described above. That is, it is a two-viewpoint type stereoscopic image display device.

  On the other hand, attempts have been made to increase the stereoscopic effect by using not only two images but also more images. For example, as described above, not only the set of two images of the left-eye image and the right-eye image is displayed in the horizontal direction, but also two additional images different from the set of these two images. The set is also arranged in the vertical direction. The shape of the opening of the parallax barrier is a pinhole. Then, when an observer's position moves up and down, a different three-dimensional image can be recognized. The set of two images arranged in the vertical direction is an image obtained by observing the object to be displayed from the vertical direction. Then, when an observer changes a position to an up-down direction, a three-dimensional effect can be felt also in an up-down direction, and as a result, a three-dimensional effect can be improved.

  Non-Patent Document 3 describes a development example of a stereoscopic image display device that displays an image in a two-dimensional shape in the horizontal direction and the vertical direction. This is a 28-viewpoint multi-view stereoscopic image display device that realizes 7 viewpoints in the horizontal direction and 4 viewpoints in the vertical direction, and the liquid crystal display device constituting the stereoscopic image display device is 22 inches diagonal. It has a display dot number of QUXGA-W (horizontal 3840 dots × vertical 2400 dots). A stereoscopic image that continuously changes when the observation position is moved not only in the horizontal direction but also in the vertical direction can be observed.

  However, in the above-described conventional stereoscopic image display device, it is assumed that the display screen is always set in one direction with respect to the observer. For this reason, when the direction of the display screen with respect to the observer is changed, it becomes impossible for the observer to visually recognize the stereoscopic image. For example, if the above-described display device is rotated 90 ° in either direction from the normal direction, the observer will observe the same image with both eyes, and thus a stereoscopic image cannot be recognized.

  In order to solve this problem, Patent Document 1 (Japanese Patent Laid-Open No. 06-214323) discloses two lenticular lenses in which the longitudinal directions of the lenses are orthogonal to each other and the focal points of the lenses are located on the same plane. Thus, a technique is disclosed in which light from a plurality of pixels that are superimposed and arranged in a matrix is distributed in both the vertical and horizontal directions of the screen. Patent Document 1 describes that this allows the observer to recognize a stereoscopic image even when the direction of the display screen relative to the observer is rotated by 90 °, for example, when the observer lies down. Yes.

“Three-dimensional display” published by Chihiro Masuda and Sangyo Tosho Co., Ltd. Nikkei Electronics No. 1 issued on January 6, 2003 838, pp. 26-27 Optical Technology Contact, Vol. 41, No. 3, 21-32, published on March 20, 2003 Japanese Patent Laid-Open No. 06-214323

  However, the conventional techniques described above have the following problems. As a result of investigations by the present inventors, it is clear that the display device described in Patent Document 1 cannot display stereoscopic images well if the orientation of the display device with respect to the observer is changed when displaying a color image. became. Hereinafter, this phenomenon will be described in detail.

  First, the case where a lens is used will be described. In order to make it possible to observe a stereoscopic image regardless of whether the display device is arranged vertically or horizontally, the above-mentioned Patent Document 1 uses two lenticular lenses arranged so that the longitudinal directions of the lenses are orthogonal to each other. However, a fly-eye lens in which lens elements are two-dimensionally arranged may be used. FIG. 36 is a perspective view showing a fly-eye lens.

  As a display device used for the stereoscopic image display device, a display device that employs the most commonly used striped color arrangement is used. For convenience of explanation, the first direction and the second direction are defined as follows. That is, the first direction is a direction in which pixels of the same color among pixels of each color are continuously arranged, and the second direction is a direction in which pixels of each color are repeatedly arranged. The first direction and the second direction are orthogonal to each other within the display surface. One display unit includes pixels of three colors of red, blue, and green, and pixels of each color are arranged in stripes. Further, since the resolution in the first direction and the resolution in the second direction are set to be equal to each other, the pitch of the color pixels in the second direction is (1/3) of the pitch in the first direction.

  In order to arrange the left and right pixels not only in the first direction but also in the second direction so that a stereoscopic image can be observed, one lens element is arranged for two identical color pixels arranged in the second direction and adjacent to each other. It is possible to arrange them. In this case, since the pixel pitch in the second direction is (1/3) of the pixel pitch in the first direction, the above Equation 3 is replaced by the following Equation 31.

  At this time, the distance H between the lens and the pixel must use the same value as the lens-pixel distance H in the first direction described above for the convenience of using one fly-eye lens. Similarly, the refractive index n of the lens is the same. It is also desirable that the observation distance OD is unchanged. As a result, Equation 1 becomes Equation 32 below. Also, Equation 2 becomes the following Equation 33.

  Note that the angles α, β, α ′, and β ′ are generally small and are within a range in which paraxial approximation is established. Therefore, e ′ is substantially equal to (e / 3), and the pixel expansion projection width is (e / 3). For example, when the pixel enlargement projection width e in the first direction is 97.5 mm, the pixel enlargement projection width e / 3 in the second direction is 32.5 mm. That is, the left and right images are enlarged and projected at a 32.5 mm pitch. As a result, a general observer with a binocular interval of 65 mm can observe only one of the left and right images at a time, and the observer can view a stereoscopic image even though the display device displays a stereoscopic image. Cannot be recognized.

  The same problem occurs not only in the lens system but also in a stereoscopic image display device using a parallax barrier system. Hereinafter, a phenomenon that occurs when the angle of the display device with respect to the observer is rotated by 90 ° from the normal observation position in the parallax barrier type stereoscopic image display device will be described.

  The conventional stereoscopic image display device shown in FIG. 33 is a stereoscopic image display device using a parallax barrier in which slit-like openings are formed. If this apparatus is rotated 90 ° from the normal arrangement, the observer will observe the same image with both eyes, and thus a stereoscopic image cannot be viewed. In order to be able to observe a stereoscopic image regardless of whether the display device is arranged vertically or horizontally, it is necessary to use a parallax barrier in which pinhole-shaped openings are two-dimensionally arranged. In this apparatus, as in the apparatus using the fly-eye lens described above, the arrangement of each color is a stripe shape, and the first direction and the second direction are defined in the same manner as described above. As a result, the color pixel pitch in the second direction is (1/3) of the pitch in the first direction.

  In order to arrange the left and right pixels not only in the first direction but also in the second direction so that a stereoscopic image can be observed, one pinhole is arranged for two color pixels arranged in the second direction and adjacent to each other. It is possible to arrange them. In this case, since the pixel pitch is (1/3) in the first direction, Equation 19 is replaced by Equation 34 below.

  At this time, the barrier-pixel distance H must be the same value as the barrier-pixel distance H in the first direction described above for the convenience of using one parallax barrier. It is also desirable that the observation distance OD is unchanged. As a result, the following Expression 35 is established.

  This means that the pixel enlarged projection width is (e / 3). As a result, as in the case of the fly-eye lens, a phenomenon occurs in which the observer cannot recognize the stereoscopic image even though the display device displays the stereoscopic image.

  Further, a similar phenomenon occurs in a stereoscopic image display device having a parallax barrier on the back surface of the display panel. Also in this case, since the pitch of the pixels in the second direction is (1/3) of the pitch in the first direction, the above formula 25 is expressed by the following formula 36.

  At this time, the barrier-pixel distance H must be the same value as the barrier-pixel distance H in the first direction described above for the convenience of using one parallax barrier. It is also desirable that the observation distance OD is unchanged. As a result, the following Expression 37 is established.

  This means that the pixel enlargement projection width becomes (e / 3), and the observer can display a stereoscopic image even though the display device displays a stereoscopic image, as in the case of the fly-eye lens described above. A phenomenon that the image cannot be recognized occurs.

  The present invention has been made in view of such problems, and even when the stereoscopic image display device is rotated by 90 ° from the normal observation direction, a color stereoscopic image is recognized by an observer with excellent visibility. It is an object of the present invention to provide a stereoscopic image display device that can be operated, a mobile terminal device equipped with the same, a display panel and a fly-eye lens incorporated in the stereoscopic image display device.

In the stereoscopic image display device according to claim 1 of the present invention, a display unit including a pixel for displaying an image for the right eye and a plurality of pixels for displaying an image for the left eye is orthogonal to the first direction and the first direction. The light emitted from the display panel arranged in a matrix in the second direction and the pixels arranged in the first direction is distributed in different directions along the first direction and arranged in the second direction. Optical means for distributing light emitted from the pixels in different directions along the second direction, and a pixel for displaying the image for the right eye and a pixel for displaying the image for the left eye Each pixel is color-coded into Z colors (Z is an integer of 2 or more), and the pixels of the same color are continuously arranged along the first direction, and the optical means is arranged in the first direction and the second direction. Multiple optical elements arranged in a matrix Configured, each of said optical element is provided corresponding to the four pixels and two pixels and two pixels in the second direction to the first direction are arranged in a matrix, the right eye The light emitted from the pixel that displays the image for the image is emitted toward the right eye of the observer, and the light emitted from the pixel that displays the image for the left eye is directed toward the left eye of the observer is emitted, the midpoint of the observer's right eye and the left eye form a three-dimensional visible range is a region capable of stereoscopic vision when positioned in a predetermined area, the pitch of the pixels in the second direction wherein a 1 / Z of the pitch of the pixels in the first direction, the optimal distance between the position and the optical means before Symbol the length of the three-dimensional visible range along the first direction or the second direction is longest The observation distance, and the distance Y between the eyes of the observer is in the range of 62 to 65 (mm). Set, magnification of the optical means is substantially the same in the first direction and the second direction, a distance from the optical means of the pixels in the first direction at a position at which the optimum viewing distance When the enlarged projection width is e (mm), the enlarged projection width of the pixel in the second direction is e / Z (mm), and k is a natural number, It is characterized by being set.

  In the present invention, the display panel displays an image for the right eye and an image for the left eye, and the optical means distributes the light emitted from the display panel along the first direction and the second direction. Then, by selecting the enlarged projection width e of the pixel in association with the observer's binocular interval Y as shown in Equation 38, the direction in which the line connecting the eyes of the observer extends (hereinafter referred to as the binocular direction) is selected. In both cases of the first direction and the second direction, the observer can position the right eye and the left eye in the right eye image projection area and the left eye image projection area, respectively. 3D images can be recognized.

In addition, the Z color in which the pixel for displaying the image for the right eye and the pixel for displaying the image for the left eye are color-coded is three colors, and the display unit is six in the second direction. it is preferable that the two pixels in the pixel first direction is constituted of 12 pixels arranged in a matrix. Moreover, it is more preferable to satisfy the following formula 40.

  As a result, the probability of recognizing a stereoscopic image when the observer randomly positions both eyes on the observation surface increases, and it is possible to quickly search the positions of both eyes so that stereoscopic viewing is possible.

  Alternatively, when k is a natural number, the binocular distance Y and the enlarged projection width e may satisfy the following formula 41 or the following formula 42.

  Thereby, even if the binocular direction is either the first direction or the second direction, the probability that the observer can recognize the stereoscopic image becomes equal.

  Furthermore, it is preferable that Y / 6 <e / 3. As a result, the number of times the left and right images are switched during the observer's binocular interval is reduced, and the stereoscopic view area is prevented from being subdivided, thereby facilitating stereoscopic vision.

Mobile terminal device according to claim 11 of the present invention is characterized by having a main body portion, and a one of the stereoscopic image display apparatus described above which is connected to the body portion.

  The stereoscopic image display device is preferably rotatably connected to the main body, and has a detecting means for detecting an arrangement direction of the stereoscopic image display device with respect to the main body, and the stereoscopic image display The apparatus switches the arrangement direction of pixels for displaying the right-eye image and pixels for displaying the left-eye image to one of the first direction and the second direction based on the detection result of the detection means. It is preferable that Thereby, the observer can switch the display direction of an image, without rotating a main-body part. In addition, the image display method can be switched in conjunction with the arrangement direction of the stereoscopic image display device.

  According to the present invention, by setting the enlarged projection width e of the pixel in association with the binocular interval Y of the observer as shown in Equation 38 above, the binocular direction of the observer is the first direction or the second direction. Regardless of the direction, the observer can position the right eye and the left eye in the projection area of the right eye image and the projection area of the left eye image, respectively, so that the color stereoscopic image can be viewed well. Can do.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings.

(First embodiment)
First, a first embodiment of the present invention will be described. FIG. 1 is a perspective view showing one display pixel in the stereoscopic image display apparatus according to the first embodiment of the present invention, and FIG. 2 is an optical model diagram showing a cross section taken along line AA ′ shown in FIG. FIG. 3 is an optical model diagram showing a cross section taken along line BB ′ shown in FIG. FIG. 4 is a perspective view showing the portable terminal device according to the present embodiment.

  As shown in FIG. 1, in the stereoscopic image display apparatus 1 according to the present embodiment, a fly-eye lens 3, a display panel 2, and a light source (not shown) are provided in order from the observer side. The display panel 2 is, for example, a transmissive liquid crystal panel. The display panel 2 is composed of a large number of display pixels, and one display pixel is composed of pixels 401 to 412 of three primary colors of red, blue and green (RGB) arranged in a stripe pattern. That is, the red pixel A401 and the red pixel B402 are adjacent to each other, and the red pixel A401 and the green pixel A405 are adjacent to each other. Similarly, the red pixel B402 and the green pixel B406 are adjacent to each other. Further, the blue pixel A409 is adjacent to the green pixel A405, and the blue pixel B410 is adjacent to the green pixel B406. Other pixels also have the same color arrangement relationship as shown in FIG.

  As shown in FIG. 1, a direction in which color pixels of the same color are continuously arranged is a first direction 21, and a direction in which different color pixels are repeatedly arranged is a second direction 22. The color pixel pitch in the second direction 22 is (1/3) of the color pixel pitch in the first direction 21. The fly-eye lens 3 has the same curvature in the first direction 21 and the second direction 22, and the lens pitch in the second direction 22 is (1/3) of the lens pitch in the first direction. That is, one lens element in the fly-eye lens 3 includes a total of four pixels (for example, red pixels A401,...) Arranged in a (2 × 2) matrix along the first direction 21 and the second direction 22. A red pixel B402, a green pixel A405, and a green pixel B406) correspond to each other. One display unit is configured by the twelve pixels 401 to 412. The light shielding unit 6 is provided between the pixels for the purpose of preventing color mixture of the image and hiding wiring for transmitting display signals to the pixels.

  At this time, when the display panel is arranged so that the first direction 21 is parallel to the direction (binocular direction) in which the line connecting the eyes of the observer extends, the first direction 21 is based on the positional relationship with respect to the fly-eye lens. Two pixels arranged in the direction 21 function as a left-eye pixel and a right-eye pixel, respectively. In one example, the red pixel A401 and the green pixel A405 act as the left eye pixel, and the red pixel B402 and the green pixel B406 act as the right eye pixel.

  Similarly, when the display panel is arranged so that the second direction 22 coincides with the binocular direction, two pixels arranged in the second direction 22 are respectively arranged on the left eye based on the positional relationship with respect to the fly-eye lens. Functions as a pixel for the right eye and a pixel for the right eye. In one example, the red pixel A401 and the red pixel B402 function as the left eye pixel, and the green pixel A405 and the green pixel B406 function as the right eye pixel. In the adjacent fly-eye lens, similarly, the blue pixel A409 and the blue pixel B410 function as the left eye pixel, and the red pixel C403 and the red pixel D404 function as the right eye pixel. Further, in the adjacent fly-eye lens, similarly, the green pixel C407 and the green pixel D408 function as the left eye pixel, and the blue pixel C411 and the blue pixel D412 function as the right eye pixel.

  As shown in FIG. 2, the pixel pitch in the first direction 21 is P, and the distance between the fly-eye lens 3 and the display panel 2 (hereinafter also referred to as a lens-pixel distance) is H. An observation plane is set at a position away from the lens surface by an observation distance OD, and an enlarged projection width of one pixel is set as e and an observer's binocular interval is set as Y. In addition, the average value of the binocular distance for adult males is 65 mm and the standard deviation is ± 3.7 mm, and the average value of the binocular distance for adult females is 62 mm and the standard deviation is ± 3.6 mm (Neil A. Dodgson , “Variation and extrema of human interpupillary distance”, Proc. SPIE vol.5291). Accordingly, when the stereoscopic display device according to the present embodiment is designed for a general adult, it is appropriate to set the value of the binocular distance Y in the range of 62 to 65 mm, and Y = 63 mm in one example. When the binocular direction coincides with the first direction 21, pixels for displaying the right-eye image and pixels for displaying the left-eye image are alternately arranged. For example, when the red pixel A401 displays an image for the left eye, the red pixel B402 displays an image for the right eye.

  Further, as shown in FIG. 3, since the pixel pitch in the second direction 22 is (P / 3), the enlarged projection width of one pixel is (e / 3). In this embodiment, the left eye 61 of the observer is located in the enlarged projection area of the green pixel A405, and the right eye 62 of the observer is located in the enlarged projection area of the green pixel C407. Between the enlarged projection area and the green pixel C407, an enlarged projection area of the blue pixel A409 and an enlarged projection area of the red pixel C403 are arranged. That is, between the left eye 61 and the right eye 62 of the observer, from the left eye 61 side toward the right eye 62, the enlarged projection area of the green pixel A405, the enlarged projection area of the blue pixel A409, and the red pixel C403. The enlarged projection area and the green pixel C407 are arranged in this order. When the observer's binocular direction coincides with the second direction 22, pixels for displaying the right-eye image and pixels for displaying the left-eye image are alternately arranged. For example, when the green pixel A405, the red pixel C403, and the blue pixel C411 display an image for the left eye, the red pixel A401, the blue pixel A409, and the green pixel C407 display an image for the right eye. That is, the left and right images are switched three times during the observer's binocular interval.

  In the present embodiment, if j and k are natural numbers on the observation surface, the observer's binocular distance Y and the pixel expansion projection width e in the first direction 21 satisfy the following Expression 48, for example, satisfy the following Expression 49: For example, the following formula 50 is satisfied. The following formula 50 is a case where k = 1 in the following formula 49.

  In addition, when the number of times the left and right images are switched in the observer's binocular interval is N, the above formulas 48 and 49 are expressed as the following formulas 51 and 52 when N is an odd number. You can also

  In FIG. 3, the number of times the left and right images are switched in the observer's binocular interval is 3, but this number is 2 depending on the position of both eyes. At this time, if 3 which is an odd value is adopted as the value of N, the above formula 52 becomes equal to the above formula 50.

  As shown in FIG. 4, the stereoscopic image display device 1 according to the present embodiment can be mounted on a mobile terminal device, for example, a mobile phone 9.

  Next, the operation of the stereoscopic image display apparatus 1 according to the present embodiment configured as described above, that is, the stereoscopic image display method according to the present embodiment will be described. First, a case where the stereoscopic image display device 1 is arranged so that the observer's binocular direction coincides with the first direction 21 will be described. FIG. 5 is an optical model diagram showing an operation when the stereoscopic image display device is arranged so that the first direction matches the binocular direction in the stereoscopic image display device according to the present embodiment. As shown in FIGS. 1 and 5, first, the light source 10 is turned on. When the light source 10 is turned on, the light emitted from the light source 10 enters the display panel 2. On the other hand, a control device (not shown) drives the display panel 2 to display a left-eye image and a right-eye image on the left-eye pixel and the right-eye pixel of each display pixel, respectively. At this time, the display panel 2 includes a pixel group including pixels 401, 405, 409, 403, 407, and 411 (hereinafter referred to as a first group) and a pixel group including pixels 402, 406, 410, 404, 408, and 412. (Hereinafter, referred to as the second group), different eye images are displayed. For example, an image for the left eye is displayed in the first group, and an image for the right eye is displayed in the second group.

  The light incident on the left-eye pixel and the right-eye pixel of the display panel 2 passes through these pixels and travels toward the fly-eye lens 3. These lights are refracted by the fly-eye lens 3, the light transmitted through the first group of the display panel 2 is directed to the region EL1, and the light transmitted through the second group is directed to the region ER1. At this time, when the observer places the left eye 61 in the region EL1 and the right eye 62 in the region ER1, an image for the left eye is input to the left eye 61 and the right eye 62 is used for the right eye. Images are input. When parallax exists between the left-eye image and the right-eye image, the observer can recognize the image displayed on the display panel 2 as a stereoscopic image.

  Next, a case where the stereoscopic image display device 1 is arranged so that the binocular direction matches the second direction 22 will be described. FIG. 6 is an optical model diagram showing an operation when the stereoscopic image display device is arranged so that the second direction matches the binocular direction in the stereoscopic image display device according to the present embodiment. As shown in FIGS. 1 and 6, a control device (not shown) drives the display panel 2, and a pixel group including pixels 401, 402, 409, 410, 407 and 408 (hereinafter referred to as a third group) , 405, 406, 403, 404, 411 and 412, different eye images are displayed on a pixel group (hereinafter referred to as a fourth group). For example, a right eye image is displayed in the third group, and a left eye image is displayed in the fourth group.

  Then, the light source 1 is turned on, and the light emitted from the light source 10 passes through each pixel of the display panel 2 and travels toward the fly-eye lens 3. These lights are refracted by the fly-eye lens 3, and the light transmitted through the third group of the display panel 2 and the light transmitted through the fourth group are directed in different directions. That is, the light emitted from the blue pixel A409 and the red pixel C403 is projected onto the region ER0 and the region EL0 by the corresponding lens element 3b, respectively. Similarly, the light emitted from the red pixel A401 and the green pixel A405 is projected to the region ER0 and the region EL0 by the corresponding lens element 3a, respectively, and the light emitted from the green pixel C407 and the blue pixel C411 is the corresponding lens element. By 3c, it projects on the area | region ER0 and area | region EL0, respectively. Further, when the light from the red pixel A401 and the green pixel A405 passes through the lens element 3b adjacent to the corresponding lens element 3a, the light is projected onto the region ER2 and the region EL1, respectively. Similarly, when the light emitted from the green pixel C407 and the blue pixel C411 passes through the lens element 3b adjacent to the corresponding lens element 3c, it is projected onto the region ER1 and the region EL2, respectively. Thereby, the light from the pixel displaying the image for the left eye is projected onto the regions EL0, EL1, and EL2, and the light from the pixel displaying the image for the right eye is projected onto the regions ER0, ER1, and ER2. Projected.

  At this time, the observer positions the left eye 61 in the region EL0, EL1, or EL2 where the left eye light is projected, and the right eye 62 is positioned in the region ER0, ER1, or ER2 where the right eye light is projected. By doing so, an image for the left eye is input to the left eye 61 and an image for the right eye is input to the right eye 62. When parallax exists between the left-eye image and the right-eye image, the observer can recognize the image displayed on the display panel 2 as a stereoscopic image.

  Next, the reason for limiting the numerical value of the present invention will be described. That is, the reason why Formula 48 to Formula 50 are satisfied will be described. Hereinafter, the probability that stereoscopic viewing is possible when the observer randomly places his / her eyes on the observation surface of the stereoscopic image display device (hereinafter referred to as stereoscopic viewing probability) will be described.

  First, a case where the binocular direction is matched with the first direction 21 will be described. 7A and 7B, when the binocular direction is made coincident with the first direction 21, the left eye 61 is located in the left eye enlarged projection area, and the right eye 62 is enlarged for the right eye. It is a figure shown about arrangement | positioning of both ends among arrangement | positionings which an observer can recognize a stereo image by being located in a projection area, (a) is (Y / 3) <= (e / 3). ) That is, the case where 0 ≦ Y ≦ e is shown, and (b) is the case where (Y / 6) ≦ (e / 3) ≦ (Y / 3), ie, e ≦ Y ≦ (2 × e). Show. In FIGS. 7A and 7B, a region on the observation surface where the image for the left eye is projected is indicated by a thick line, and a region where the image for the right eye is projected is indicated by a thin line. The boundary point between the enlarged projection area of the left-eye pixel and the enlarged projection area of the right-eye pixel is defined as the origin O. FIG. 8 is a diagram showing an optical model when (e / 3) = (Y / 2), that is, Y = (2/3) × e, and FIG. 9 is a diagram showing (e / 3) = (Y / 4). That is, it is a diagram showing an optical model when Y = (4/3) × e. As described above, when the binocular direction coincides with the first direction 21, the width of the enlarged projection area of one pixel is e. Therefore, the width of the enlarged projection area of a pair of left and right pixels adjacent to each other is e. (2 × e). Therefore, the region having the length of (2 × e) is set as a basic unit region, and stereoscopic view is possible if the midpoint 63 between the left eye 61 and the right eye 62 is located in the basic unit region. Will be explained.

(1-1) When (Y / 3) ≦ (e / 3) (0 ≦ Y ≦ e) As shown in FIG. 7A, the observer can recognize a stereoscopic image. Is a case where the distance E between the midpoint 63 of the left eye 61 and the right eye 62 and the origin O is (Y / 2) or less. Accordingly, since the length of the arrangement range of the midpoint 63 that enables recognition of the stereoscopic image is (2 × E), the observer randomly places his / her eyes on the observation surface of the stereoscopic image display device. The stereoscopic probability PR that can be stereoscopically viewed is given by the following mathematical formula 53.

(1-2) When (Y / 6) ≦ (e / 3) ≦ (Y / 3) (e ≦ Y ≦ (2 × e)) As shown in FIG. The image can be recognized when the distance E between the midpoint 63 and the origin O is (e− (Y / 2)) or less. Accordingly, since the length of the arrangement range of the midpoint 63 at which the stereoscopic image can be recognized is (2 × E), the stereoscopic probability PR is given by the following mathematical formula 54.

  As can be seen from Equation 53 and Equation 54, the stereoscopic probability PR monotonously increases when the value of (e / 3) is in the range of (1-1), and the value of (e / 3) is The maximum value is taken at (Y / 3), and the value decreases monotonously when the value of (e / 3) is in the range of (1-2).

  Next, the value of the stereoscopic probability PR is calculated for several values of (e / 3). From Equation 53 above, when (e / 3) is infinite (∞), that is, Y = 0, PR = 0. As shown in FIG. 8, when (e / 3) = (Y / 2), that is, Y = (2/3) × e, PR = (1/3) ≈0.33. Further, when (e / 3) = (Y / 3), that is, Y = e, PR = (1/2) = 0.5 from Equation 53 above. Furthermore, as shown in FIG. 9, when (e / 3) = (Y / 4), that is, Y = (4/3) × e, PR = (1/3) ≈ 0.33. Furthermore, when (e / 3) = (Y / 6), that is, Y = (2 × e), PR = 0 from the above equation 54.

  Next, the stereoscopic vision probability when the binocular direction matches the second direction 22 will be described. 10A to 10F, when the binocular direction coincides with the second direction 22, the left eye 61 is positioned in the left eye enlarged projection area, and the right eye 62 is enlarged for the right eye. It is a figure which shows about arrangement | positioning of both ends among arrangement | positioning which an observer can recognize a stereo image by being located in a projection area, (a) is Y <= (e / 3), ie, 0. ≦ Y ≦ (e / 3) is shown, (b) is (Y / 2) ≦ (e / 3) ≦ Y, that is, (e / 3) ≦ Y ≦ (2/3) × e. (C) shows a case where (Y / 3) ≦ (e / 3) ≦ (Y / 2), that is, (2/3) × e ≦ Y ≦ e, and (d) shows (Y / 4) ≦ (e / 3) ≦ (Y / 3), that is, e ≦ Y ≦ (4/3) × e, where (e) is (Y / 5) ≦ (e / 3) ≦ (Y / 4) That is, (4/3) × e ≦ Y ≦ (5/3) × e (F) shows the case of (Y / 6) ≦ (e / 3) ≦ (Y / 5), that is, (5/3) × e ≦ Y ≦ (2 × e). In FIGS. 10A to 10F, the region on the observation surface where the image for the left eye is projected is indicated by a thick line, and the region where the image for the right eye is projected is indicated by a thin line. The boundary point between the enlarged projection area of the left-eye pixel and the enlarged projection area of the right-eye pixel is defined as the origin O.

  FIG. 11 is a diagram showing an optical model when (e / 3) = (Y / 2), that is, Y = (2/3) × e, and FIG. 12 shows (e / 3) = (Y / 4) That is, it is a diagram showing an optical model when Y = (4/3) × e. As described above, when the binocular direction is the second direction 22, since the width of the enlarged projection area of one pixel is (e / 3), the width of the enlarged projection area of a pair of left and right pixels adjacent to each other Is (2/3) × e. Therefore, an area having a length of (2/3) × e is set as a basic unit area, and a stereoscopic view is possible if the midpoint 63 between the left eye 61 and the right eye 62 is located in the basic unit area. Will be described.

(2-1) When Y ≦ (e / 3) (0 ≦ Y ≦ (e / 3)) As shown in FIG. 10A, the observer can recognize a stereoscopic image. Is a case where the distance E between the midpoint 63 of the left eye 61 and the right eye 62 and the origin O is (Y / 2) or less. Accordingly, since the length of the arrangement range of the midpoint 63 that enables recognition of the stereoscopic image is (2 × E), the observer randomly places his / her eyes on the observation surface of the stereoscopic image display device. The stereoscopic probability PR that enables stereoscopic viewing is given by the following formula 55. At this time, the number N of times the left and right images are switched during the observer's binocular interval is 0 or 1.

(2-2) When (Y / 2) ≦ (e / 3) ≦ Y ((e / 3) ≦ Y ≦ (2/3) × e) As shown in FIG. Can recognize a stereoscopic image when the distance E between the midpoint 63 and the origin O is ((e / 3) − (Y / 2)) or less. Therefore, since the length of the arrangement range of the midpoint 63 at which the stereoscopic image can be recognized is (2 × E), the stereoscopic vision probability PR is given by the following mathematical formula 56. At this time, the number N of times the left and right images are switched in the observer's binocular interval is 1 or 2.

(2-3) When (Y / 3) ≦ (e / 3) ≦ (Y / 2) ((2/3) × e ≦ Y ≦ e) As shown in FIG. Can recognize a stereoscopic image when the distance E between the midpoint 63 and the edge of the basic unit region is equal to or greater than ((Y / 2) − (e / 3)). is there. Accordingly, since the length of the arrangement range of the midpoint 63 at which the stereoscopic image can be recognized is (2 × E), the stereoscopic viewing probability PR is given by the following mathematical formula 57. At this time, the number N of times the left and right images are switched in the observer's binocular interval is 2 or 3.

(2-4) When (Y / 4) ≦ (e / 3) ≦ (Y / 3) (e ≦ Y ≦ (4/3) × e) As shown in FIG. Can recognize a stereoscopic image when the distance E between the midpoint 63 and the edge of the basic unit region is ((2/3) × e− (Y / 2)) or more. Is the case. Therefore, since the length of the arrangement range of the midpoint 63 at which the stereoscopic image can be recognized is (2 × E), the stereoscopic vision probability PR is given by the following mathematical formula 58. At this time, the number N of times the left and right images are switched in the observer's binocular interval is 3 or 4.

(2-5) When (Y / 5) ≦ (e / 3) ≦ (Y / 4) ((4/3) × e ≦ Y ≦ (5/3) × e) FIG. 10 (e) As shown, the observer can recognize the stereoscopic image because the distance E between the midpoint 63 and the origin O is ((Y / 2) − (2/3) × e) or less. This is the case. Accordingly, since the length of the arrangement range of the midpoint 63 at which the stereoscopic image can be recognized is (2 × E), the stereoscopic vision probability PR is given by the following mathematical formula 59. At this time, the number N of switching between the left and right images in the observer's binocular interval is 4 or 5.

(2-6) When (Y / 6) ≦ (e / 3) ≦ (Y / 5) ((5/3) × e ≦ Y ≦ (2 × e)) As shown in FIG. In addition, the observer can recognize the stereoscopic image when the distance E between the midpoint 63 and the origin O is (e− (Y / 2)) or less. Accordingly, since the length of the arrangement range of the midpoint 63 at which the stereoscopic image can be recognized is (2 × E), the stereoscopic vision probability PR is given by the following mathematical formula 60. At this time, the number N of times the left and right images are switched in the observer's binocular interval is 5 or 6.

  The above formulas 55 to 60 are functions that are continuous with each other, and the stereoscopic probability PR has a value of (e / 3) of the above (2-1), (2-3), and (2-5). When it is within the range, it monotonously increases, and when the value of (e / 3) is within the range of (2-2), (2-4) and (2-6), it monotonously decreases, and (e / 3 ) Is a maximum when (Y / 5), (Y / 3), and Y, and a minimum when (e / 3) is (Y / 4) and (Y / 2). Take. The above formulas 53 to 60 are summarized in Table 1.

  Next, the value of the stereoscopic probability PR is calculated for several values of (e / 3). From Equation 55 above, when (e / 3) is infinite (∞), that is, Y = 0, PR = 0. When (e / 3) = Y, PR = (1/2) = 0.5. Furthermore, from Equation 56 and Equation 57, as shown in FIG. 11, PR = 0 when (e / 3) = (Y / 2), that is, Y = (2/3) × e. Furthermore, when (e / 3) = (Y / 3), that is, Y = e, PR = (1/2) = 0.5 from the above-mentioned formulas 57 and 58. Furthermore, from the above equations 58 and 59, as shown in FIG. 12, when (e / 3) = (Y / 4), that is, Y = (4/3) × e, PR = 0. . Furthermore, from Equation 59 and Equation 60, when (e / 3) = (Y / 5), that is, Y = (5/3) × e, PR = (1/2) = 0.5. is there. Furthermore, from the above equation 60, when (e / 3) = (Y / 6), that is, Y = (2 × e), PR = 0.

  FIG. 13 is a graph showing Equation 53 to Equation 60, where the horizontal axis represents the value of (e / 3) and the Y value, and the vertical axis represents the stereoscopic probability PR. The unit of the vertical axis in FIG. 13 is (%). Further, the stereoscopic vision probability (Equation 53 and Equation 54) when the binocular direction is the first direction is indicated by a solid line, and the stereoscopic vision probability (Equation 55 to Equation 60) when the binocular direction is the second direction. It is indicated by a broken line. As shown in FIG. 13, when the stereoscopic image display device is arranged so that the first direction 21 is in the binocular direction of the observer, the period of the stereoscopic vision probability is arranged so that the second direction 22 is in the binocular direction. It can be seen that sometimes it is three times the period of the stereoscopic probability. Note that similar periodicity is recognized between the stereoscopic probability and the (e / 3) value even in a range other than (Y / 6) <(e / 3).

  Then, as shown in FIG. 13, if the period (e / 3) of the enlarged projection area of the pixel in the second direction 22 satisfies the following formula 61, the binocular direction is determined as either the first direction 21 or the second direction 22. As the direction, a stereoscopic image can be recognized with a probability greater than zero. The following formula 61 is the same formula as the above-described formula 48.

  If the value of (e / 3) satisfies the following formula 62, the value of (e / 3) falls within the range 31 shown in FIG. The following formula 62 is the same formula as the formula 49. As a result, a high stereoscopic probability can be obtained regardless of whether the binocular direction is set to the first direction 21 or the second direction 22. That is, from the above formulas 53 and 54, the stereoscopic probability PR when the binocular direction is the first direction 21 is 42 to 50%. Further, from the above formulas 57 and 58, the stereoscopic vision probability PR when the binocular direction is the second direction 22 is 25 to 50%. In the present embodiment, the value of (e / 3) satisfies the following formula 63, for example.

  Furthermore, as shown in FIG. 13, it is more preferable that the value of (e / 3) satisfies the following mathematical formula 64. In the following mathematical formula 64, if k = 1, (e / 3) = (Y / 3), that is, Y = e. This corresponds to the intersection 32 shown in FIG. In this case, even if the binocular direction is set to either the first direction 21 or the second direction 22, the stereoscopic probability PR is 50%, and the visibility of the stereoscopic image can be maximized.

  As the value of (e / 3) with respect to the binocular interval Y decreases, the number of times the left and right images are switched in the binocular interval of the observer increases. For this reason, even if the stereoscopic vision probability is the same, the arrangement period between the range in which stereoscopic vision is possible and the range in which stereo vision is impossible is shortened, and the observer positions both eyes within the range where stereoscopic vision is possible. It becomes difficult to make. For this reason, it is preferable to satisfy Y / 6 <e / 3. As a result, the number N of switching between the left and right images during the binocular interval is 6 or less. This range is the range 35 (Y / 6 <e / 3 <Y / 4), the range 30 (Y / 4 <e / 3 <Y / 2) and the range 33 (Y / 2 <e /) in FIG. It corresponds to 3).

  In this embodiment, since the period of the enlarged projection area is set so as to satisfy the above formula 61, even if the binocular direction is either the first direction 21 or the second direction 22, a stereoscopic image is displayed to the observer. Can be recognized. In particular, if the period is set so as to satisfy the above formula 62, the visibility of the stereoscopic image is further improved, and if it is set so as to satisfy the above formula 64, the visibility is further improved.

  Further, in the stereoscopic image display apparatus according to the present embodiment, since a fly-eye lens is used as the optical means, a black stripe pattern caused by the barrier is not generated as compared with the case where a parallax barrier is used. In addition, there is little light loss.

  Furthermore, the stereoscopic image display apparatus according to the present embodiment can be suitably applied to a mobile device such as a mobile phone, and can display a favorable stereoscopic image. If the stereoscopic image display device according to the present embodiment is applied to a mobile device, unlike the case of applying to a large display device, the observer can arbitrarily adjust the positional relationship between his eyes and the display screen, which is optimal. A visible region can be quickly found.

  Note that, as shown in the above formulas 16 to 17, normally, the distance H between the apex of the lens and the pixel is made equal to the focal length f of the lens, but it can be set to a different value. In this case, the enlarged projection image of the pixel is blurred and thus has a large width. However, in order to apply the present invention in this case, the value of the enlarged projection width e of the pixel may be handled as the width of the blurred image. By blurring the image of the pixels, the image of the non-display area is also blurred, so that the generation of a striped pattern caused by the non-display area can be suppressed.

  In this embodiment, a transmissive liquid crystal display panel is used as a display panel. However, the present invention is not limited to this, and a reflective liquid crystal display panel or a half in which a transmissive region and a reflective region are provided in each pixel. A transmissive liquid crystal display panel may be used. Further, the driving method of the liquid crystal display panel may be an active matrix method such as a TFT (Thin Film Transistor) method and a TFD (Thin Film Diode) method, or a passive method such as an STN (Super Twisted Nematic Liquid Crystal) method. A matrix system may be used. Further, the display panel is a display panel other than a liquid crystal display panel, for example, an organic electroluminescence display panel, a plasma display panel, a CRT (Cathode-Ray Tube) display panel, or an LED (Light Emitting Diode) display panel. A field emission display panel or PALC (Plasma Address Liquid Crystal) may be used.

  Furthermore, although the above description is about the case of two viewpoints, the present invention is not limited to this, and the same applies to the case of using three or more viewpoints. Furthermore, the above description is for the case where the display pixel is composed of pixels of three primary colors of red, blue, and green arranged in a stripe shape, but the present invention is not limited to this. The same applies to the number of colors other than colors. That is, the number of colors may be two colors or four or more colors. When the number of colors is generally Z (Z is an integer equal to or greater than 2), the above formulas 61, 62, and 64 can be generally expressed as formulas 43, 44, and 45, respectively.

  Furthermore, the stereoscopic image display device according to the present embodiment can be applied not only to mobile phones but also to mobile terminal devices such as mobile terminals, PDAs, game machines, digital cameras, and digital video cameras.

(Modification of the first embodiment)
Next, a modification of the first embodiment will be described. 14 (a) and 14 (b) are perspective views showing a mobile phone according to this modification. FIG. 14 (a) shows a case where the stereoscopic image display device is used in a normal arrangement, and FIG. 14 (b) is a 90 ° rotation. The case where it is used is shown. As shown in FIGS. 14A and 14B, in the mobile phone according to this modification, the stereoscopic image display device 1 is rotatably mounted. Then, the stereoscopic image display device 1 can have a normal arrangement as shown in FIG. 14A (hereinafter referred to as a vertical arrangement), and 90 ° from the normal arrangement as shown in FIG. 14B. It is also possible to adopt a rotated arrangement (hereinafter referred to as a horizontal arrangement). For example, the stereoscopic image display device 1 is connected to the main body of the mobile phone 9 by a rotary connection member (not shown) that can rotate while maintaining an electrical connection. In addition, the mobile phone according to the present modification includes detection means (not shown) that detects the arrangement direction of the stereoscopic image display device 1 and displays the stereoscopic image so that the observer can visually recognize the stereoscopic image according to the arrangement direction. The image is switched.

  Next, the operation of the mobile phone according to this modification will be described. FIG. 15 is a flowchart illustrating an operation of switching the display image according to the arrangement direction of the stereoscopic image display device in the present modification. In this modification, for convenience of explanation, the binocular direction is the second direction 22 when the stereoscopic image display device is arranged vertically, and the binocular direction is the first direction 21 when arranged horizontally. To do.

  In the initial state, the user (observer) turns off the mobile terminal device. Then, as shown in step S <b> 1 of FIG. 15, when the mobile phone is turned on, the mobile phone detects the arrangement direction of the stereoscopic image display device 1.

  When the detection result is vertical arrangement, as shown in step S2, the mobile terminal device displays left and right parallax images on the pixels arranged in the second direction in each display unit of the stereoscopic image display device. As a result, the user can recognize a stereoscopic image in a vertical arrangement. Then, it returns to step S1.

  On the other hand, when the stereoscopic image display device is rotated to be in the horizontal arrangement, the mobile phone detects that the mobile terminal device is in the horizontal arrangement in step S1. In this case, the process proceeds to step S3, and the stereoscopic image display device 1 displays the left and right parallax images on the pixels arranged in the first direction in each display unit. Thereby, the user can recognize a three-dimensional image in a horizontal arrangement. Then, it returns to step S1.

  As described above, the stereoscopic image display device displays the parallax image on the pixels arranged in the second direction when vertically arranged, but the same information may be displayed on the pixels arranged in the first direction. Thereby, even when the observation angle is changed in the vertical direction, a wide viewing angle can be obtained. Different information can also be displayed on the pixels arranged in the first direction. Thereby, different information can be acquired only by changing the viewing angle of the stereoscopic image display device in the vertical direction. The same applies to the horizontal arrangement.

  Thus, in this modification, the direction of image display can be switched by rotating only the stereoscopic image display device without rotating the mobile phone body. Further, when the detection unit detects the direction of the stereoscopic image display device, the display direction of the image can be switched in cooperation with the direction of the stereoscopic image display device.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 16 is an optical model diagram in the case where the stereoscopic image display apparatus according to the present embodiment is arranged such that the first direction is the observer's binocular direction, and FIG. In operation | movement of the stereo image display apparatus which concerns on a form, it is an optical model figure when the stereo image display apparatus is arrange | positioned so that the said 2nd direction may turn into a binocular direction. This embodiment is a case where the enlargement magnification of the pixel is increased as compared with the first embodiment described above, and is a case where the value of (e / 3) is within the range 33 in FIG. That is, the value of (e / 3) satisfies the following formula 65. In this case, when the stereoscopic image display device is arranged so that the second direction 22 is the binocular direction, the number N of switching between the left and right images in the observer's binocular interval is 0 or 1 depending on the position of both eyes. When both eyes are positioned so that a stereoscopic image can be recognized, N = 1.

  Further, as shown in FIG. 13, if the value of (e / 3) is made to coincide with the intersection point 34 between the mathematical formulas 53 and 56, the stereoscopic probability PR when the binocular direction is the first direction 21, The stereoscopic vision PR when the binocular direction is the second direction 22 can be matched, and the same visibility can be obtained in the vertical arrangement and the horizontal arrangement. From the above formulas 53 and 56, the value of (e / 3) at the intersection point 34 is as shown in the following formula 66, and the stereoscopic probability PR at that time corresponds to the case where the binocular direction is the first direction 21 and In both cases of the two directions 22, it is 25%. Therefore, it is preferable to set the value of (e / 3) to the value shown in the following formula 66. The following formula 66 can also be generally expressed as the following formula 67. Equation 66 below is for k = 1 in Equation 67 below. Other configurations, operations, and effects of the present embodiment are the same as those of the first embodiment.

(Third embodiment)
Next, a third embodiment of the present invention will be described. FIG. 18 is an optical model diagram when the stereoscopic image display device according to the present embodiment is arranged so that the first direction coincides with the binocular direction of the observer, and FIG. 19 is a stereoscopic model according to the present embodiment. It is an optical model figure at the time of arrange | positioning an image display apparatus so that the said 2nd direction may correspond with an observer's binocular direction. In this embodiment, the enlargement magnification of the pixel is reduced as compared with the first embodiment described above, and the pixel enlargement projection width e / 3 in the second direction 22 satisfies the following formula 68 with respect to the binocular interval Y. . This corresponds to the range 35 shown in FIG. In this case, when the stereoscopic image display device is arranged so that the second direction 22 is the binocular direction, the switching frequency N of the left and right images during the observer's binocular interval is 4 to 6 depending on the position of both eyes. N = 5 when both eyes are positioned so that a stereoscopic image can be recognized.

  In addition, as shown in FIG. 13, if the value of (e / 3) is made to coincide with the intersection point 36 of Formula 54 and Formula 59, the stereoscopic vision probability PR when the binocular direction is the first direction 21; The stereoscopic vision PR in the case where the binocular direction is the second direction 22 matches, and the same visibility can be obtained in the vertical arrangement and the horizontal arrangement. From the above formulas 55 and 60, the value of (e / 3) at the intersection point 36 is as shown in the following formula 69, and the stereoscopic probability PR at that time is that when the binocular direction is the first direction 21 and In both cases of the two directions 22, it is 25%. Therefore, it is preferable to set the value of (e / 3) to the value shown in the following formula 69. The following formula 69 can also be generally expressed as the following formula 70. The following formula 69 is a case where k = 1 in the following formula 70. Other configurations, operations, and effects of the present embodiment are the same as those of the first embodiment.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. 20 is a perspective view showing the stereoscopic image display apparatus according to the present embodiment, FIG. 21 is an optical model diagram showing a cross section taken along the line CC ′ shown in FIG. 20, and FIG. It is an optical model figure which shows the cross section by D 'line. As shown in FIG. 20, in the fourth embodiment, the pixels in the display panel 2 are arranged in a square manner in which the pitches in the first direction 21 and the second direction 22 are equal to each other. In each display unit, the pixels for the two left and right viewpoints in the first direction 21 and the pixels for the two left and right viewpoints in the second direction 22 are arranged in a (2 × 2) matrix to form a pixel matrix. . Since the shape of the pixel is a square as described above, the shape of the pixel matrix is also a square. In the display panel 2, a plurality of pixel matrices are arranged in a matrix.

  The fly-eye lens 3 is arranged so that one lens element corresponds to one pixel matrix composed of (2 × 2) pixels. That is, the lens elements are arranged in a matrix. In the illustrated example, one lens element corresponds to a pixel matrix including a red pixel A401, a red pixel B402, a red pixel C403, and a red pixel D404. Similarly, one lens element corresponds to a pixel matrix composed of a green pixel A405, a green pixel B406, a green pixel C407, and a green pixel D408, and a pixel matrix composed of a blue pixel A409, a blue pixel B410, a blue pixel C411, and a blue pixel D412. Each lens element corresponds to a pixel matrix composed of a blue-green pixel A413, a blue-green pixel B414, a blue-green pixel C415, and a blue-green pixel D416. Since the pixel shape is a square, the lens pitch in the first direction and the second direction is the same. Four pixels belonging to one pixel matrix are pixels of the same color, and the pixel colors are different between adjacent pixel matrices.

  Four pixel matrices arranged in a (2 × 2) matrix, that is, 16 pixels arranged in a (4 × 4) matrix form one display unit. Accordingly, each display unit is provided with four colors of pixels, and in addition to the three primary colors red, blue and green, a blue-green pixel having a spectrum different from that of green is provided.

  Further, as shown in FIGS. 21 and 22, the observation distance OD, the pixel enlarged projection width e at the observation distance OD, the distance H between the apex of the lens and the pixel, and the pixel pitch P in the first direction are the above formulas. It is comprised so that 10 thru | or 13 may be satisfy | filled. In the second direction 22 as well, the pixel pitch P is the same as the pixel pitch in the first direction. Other configurations and operations in the present embodiment are the same as those in the first embodiment.

  In the present embodiment, since the pixel pitch in the first direction 21 is equal to the pixel pitch in the second direction, other parameters can be made the same. For this reason, the enlarged projection width of the pixels on the same observation surface can be made the same in the first direction and the second direction. As a result, the visibility of the stereoscopic image can be improved regardless of the direction in which the stereoscopic image display device is arranged. Each pixel matrix is composed of a plurality of pixels of the same color. Thereby, the continuous area | region of the same color in the display panel 2 can be enlarged, and manufacture of a display panel becomes easy. The effects of the present embodiment other than those described above are the same as those of the first embodiment described above.

  The above description is for the case where the display panel is composed of pixels of four colors of red, blue, green, and blue-green. However, the present invention is not limited to this, and other than these The same applies to the four colors. The same applies to the number of colors other than four colors.

(Modification of the fourth embodiment)
Next, a modification of the fourth embodiment will be described. In the above-described fourth embodiment, the pixel matrix corresponding to one lens element is composed of pixels of the same color, but in this modification, it is composed of pixels of different colors. FIG. 23 is a perspective view showing a stereoscopic image display apparatus according to this modification. As shown in FIG. 23, in this modification, for example, one pixel matrix includes red pixels A401, green pixels B406, blue pixels C411, and blue-green pixels D416, and one lens element is included in this pixel matrix. Corresponds. Similarly, one lens element corresponds to a pixel matrix including a green pixel A405, a blue pixel B410, a blue green pixel C415, and a red pixel D404, and includes a blue pixel A409, a blue green pixel B414, a red pixel C403, and a green pixel D408. One lens element corresponds to the pixel matrix, and one lens element corresponds to the pixel matrix including the blue-green pixel A413, the red pixel B402, the green pixel C407, and the blue pixel D412. That is, the color arrangement is a mosaic so that one viewpoint is composed of different colors.

  For this reason, the stereoscopic image display apparatus according to the present modification is suitable for displaying an image of a natural landscape or the like. On the other hand, as described above, when one pixel matrix is composed of pixels of the same color, there is an advantage that the display panel can be easily manufactured because the continuous region of the same color can be enlarged.

  In the present embodiment and its modifications, two colors of green having different spectra are used in order to correspond to four color pixels. This improves the color reproducibility of the stereoscopic image display device. Can do. Moreover, it is also possible to use normal green and white pixels instead of two green colors having different spectra. In this case, there is an effect of improving the luminance of the stereoscopic image display device.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described. FIG. 24 is a perspective view showing a stereoscopic image display apparatus according to this embodiment. In the fifth embodiment, the lens elements in the fly-eye lens have a delta arrangement, and the pixel matrix constituting one display unit has a delta arrangement, as compared with the fourth embodiment described above. The point is different. The (2 × 2) pixels constituting each pixel matrix are in a square arrangement as in the fourth embodiment, and one pixel matrix is composed of pixels of the same color. That is, the red pixel A 401, the red pixel B 402, the red pixel C 403, and the red pixel D 404 constitute one pixel matrix, and one lens element corresponds to this pixel matrix. Similarly, the green pixel A405, the green pixel B406, the green pixel C407, and the green pixel D408 constitute one pixel matrix, and one lens element corresponds to the pixel matrix, and the blue pixel A409, the blue pixel B410, and the blue pixel C411. The blue pixel D412 constitutes one pixel matrix, and one lens element corresponds to this pixel matrix. The above-described pixels 401 to 412 constitute one display unit.

  In this embodiment, since the lens elements and the pixel matrix are in a delta arrangement, the display unit can be configured with three primary colors of red, green, and blue. For this reason, the visibility of the three-dimensional image in the first direction and the second direction can be improved while maintaining compatibility with the conventional color display. Moreover, since it is a delta arrangement, a natural image or the like can be suitably displayed.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described. 25 is a perspective view showing a stereoscopic image display apparatus according to the present embodiment, FIG. 26 is an optical model diagram showing a cross section taken along line EE ′ shown in FIG. 25, and FIG. 27 is an F model shown in FIG. It is an optical model figure which shows the cross section by a -F 'line. In the first embodiment described above, a fly-eye lens is used as the optical means, but in this embodiment, two lenticular lenses are used as the optical means. That is, as shown in FIG. 25, the stereoscopic image display device 1 is provided with a lenticular lens 51, a lenticular lens 52, a display panel 2, and a light source (not shown) in order from the observer side.

  The plurality of cylindrical lenses constituting the lenticular lens 51 have the longitudinal direction thereof aligned with the second direction 22 and are arranged along the first direction 21. The plurality of cylindrical lenses constituting the lenticular lens 52 have the longitudinal direction thereof aligned with the first direction 21 and are arranged along the second direction 22. Therefore, the lenticular lens 51 and the lenticular lens 52 are overlapped so that the longitudinal directions of the cylindrical lenses are orthogonal to each other. Further, the lenticular lens 51 is arranged with its lens surface facing an observer (not shown), and the lenticular lens 52 is arranged with its lens surface facing the display panel 2. That is, the flat surface of the lens 51 (the surface opposite to the lens surface) faces the lens 52, and the lens surface of the lens 52 faces the display panel 2. Furthermore, the lens pitch of the lenticular lens 51 is three times the lens pitch of the lenticular lens 52.

  As shown in FIG. 26, there are the following equation 1 between the observation distance OD, the pixel enlarged projection width e at the observation distance OD, the distance H between the vertex of the lens 51 and the pixel, and the pixel pitch P in the first direction 21. From Equations (2) and (2), the following Equations 71 to 73 are established.

  As shown in FIG. 27, the observation distance OD, the pixel expansion projection width e at the observation distance OD, the distance H2 between the apex of the lens 52 and the pixel, and the pixel pitch (P / 3) in the second direction 22 The following formulas 74 to 76 are established.

  The position H of the lenticular lenses 51 and 52 is calculated by calculating the distance H between the lens 51 and the pixel from the equations 71 to 73 and calculating the distance H2 between the lens 52 and the pixel from the equations 74 to 76. Can be requested.

  Since the stereoscopic image display apparatus according to the present embodiment can independently set the distance between the apex of the lens of the two lenticular lenses and the pixel, the enlarged projection width of the pixel in the first direction and the second direction can be increased. Each can be set independently. For this reason, the enlarged projection image width of the pixel on the same observation surface can be made the same in the first direction and the second direction. As a result, even when the binocular direction is made to coincide with any one of the first direction 21 and the second direction 22, the visibility of the stereoscopic image can be improved. Further, by setting the lens pitch of the lenticular lens 51 to be three times the lens pitch of the lenticular lens 52, when pixels of three colors are repeatedly arranged along the second direction, images in the first direction and the second direction are displayed. Can be made equal to each other. Other configurations, operations, and effects of the present embodiment are the same as those of the first embodiment.

  Although the lens surface of the lenticular lens 52 can be arranged on the observer side, as long as the flat surface of the lens 51 and the flat surface of the lens 52 face each other as in the present embodiment. Since the distance H2 between the apex of the lens 52 and the pixel can be set to a value of about 1/3 of the distance H between the apex of the lens 51 and the pixel, it can correspond to a smaller distance H2. Therefore, it can be applied to a high-definition panel having a small pixel pitch P. For this reason, in this embodiment, the lenses 51 and 52 are arranged with their flat surfaces facing each other.

  Further, if an optical film (not shown) such as a polarizing plate is disposed between the lenticular lens 51 and the lenticular lens 52, it is possible to cope with a smaller distance H2, which is effective for high definition. Further, instead of the two lenticular lenses 51 and 52, two parallax barriers having slit-like openings may be used. At this time, the longitudinal directions of the openings in the two parallax barriers are perpendicular to each other. Then, one parallax barrier in which the longitudinal direction of the openings is the second direction and the arrangement direction of the openings is the first direction is arranged at a position farther from the display panel than the other parallax barrier, It is preferable that the arrangement pitch of the openings in the parallax barrier is three times the arrangement pitch of the openings in the other parallax barrier.

  Further, the above description is for the case where the pixel is composed of three colors of red, blue, and green. However, the present invention is not limited to this, and the same applies to the number of colors other than three. Applicable. That is, it is preferable that the lens pitch of the one lenticular lens is Z times the lens pitch of the other lenticular lens according to the number of colors Z (Z is an integer of 2 or more). The same applies to the case of the parallax barrier, and the arrangement pitch of the openings in the one parallax barrier is preferably Z times the arrangement pitch of the openings in the other parallax barrier.

(Seventh embodiment)
Next, a seventh embodiment of the present invention will be described. FIG. 28 is a perspective view showing a stereoscopic image display apparatus according to this embodiment. As shown in FIG. 28, in this embodiment, a parallax barrier 7 is provided on the viewer side of the display panel 2 instead of the fly-eye lens 3 as compared to the first embodiment. . In the parallax barrier 7, pinholes 8 are formed in a matrix. Other configurations in the present embodiment are the same as those in the first embodiment.

  In the present embodiment, by providing a barrier instead of a lens, it is possible to suppress the occurrence of a striped pattern caused by the surface reflection of the lens, and to prevent the display image quality from being deteriorated due to the striped pattern. The effects of the present embodiment other than those described above are the same as those of the first embodiment described above.

  Note that the parallax barrier 7 may be provided on the back side of the display panel 2. In this case, when the observer observes the image, the barrier is not obstructive, and thus the visibility is further improved. In the sixth embodiment described above, one of the two lenticular lenses may be replaced with a parallax barrier having a slit-like opening. Furthermore, since the pinhole or slit-shaped opening formed in the parallax barrier actually has a finite size, the enlarged projection image of the pixel is blurred and has a large width. In this case, the present invention can be applied by treating the value of the enlarged projection width e of the pixel as the width of the blurred image. Increasing the aperture width increases the crosstalk between the left and right images, while enabling bright display. Furthermore, the seventh embodiment is an example in which a parallax barrier is used in place of the fly-eye lens in the first embodiment described above. Similarly, in the second to fifth embodiments described above, Instead of the fly-eye lens, a parallax barrier having pinhole-shaped openings can be used.

  Examples of utilization of the present invention include portable terminal devices such as mobile phones, PDAs, game machines, digital cameras, and digital video cameras. The present invention can be suitably applied to an apparatus that displays a color stereoscopic image.

FIG. 3 is a perspective view showing one display pixel in the stereoscopic image display device according to the first embodiment of the present invention. It is an optical model figure which shows the cross section by the A-A 'line shown in FIG. It is an optical model figure which shows the cross section by the B-B 'line | wire shown in FIG. It is a perspective view which shows the portable terminal device which concerns on this embodiment. In the stereoscopic image display device according to the present embodiment, it is a cross-sectional view showing the operation when the stereoscopic image display device is arranged so that the first direction coincides with the binocular direction. In the stereoscopic image display device according to the present embodiment, it is a cross-sectional view showing the operation when the stereoscopic image display device is arranged so that the second direction coincides with the binocular direction. 7A and 7B, when the binocular direction is made coincident with the first direction 21, the left eye 61 is located in the left eye enlarged projection area, and the right eye 62 is enlarged for the right eye. It is a figure shown about arrangement | positioning of both ends among arrangement | positionings which an observer can recognize a stereo image by being located in a projection area, (a) is (Y / 3) <= (e / 3). ) That is, the case where 0 ≦ Y ≦ e is shown, and (b) is the case where (Y / 6) ≦ (e / 3) ≦ (Y / 3), ie, e ≦ Y ≦ (2 × e). Show. It is a figure which shows an optical model in case of (e / 3) = (Y / 2), ie, Y = (2/3) * e. It is a figure which shows an optical model in the case of (e / 3) = (Y / 4), ie, Y = (4/3) * e. In (a) to (f), when the binocular direction is made coincident with the second direction 22, the left eye 61 is positioned in the enlarged projection area for the left eye, and the right eye 62 is the enlarged projection area for the right eye. FIG. 6 is a diagram showing the arrangement at both ends of the arrangement that enables the observer to recognize a stereoscopic image by being positioned in the position, and (a) is Y ≦ (e / 3), that is, 0 ≦ Y. ≦ (e / 3) is shown, and (b) is a case where (Y / 2) ≦ (e / 3) ≦ Y, that is, (e / 3) ≦ Y ≦ (2/3) × e. (C) shows a case where (Y / 3) ≦ (e / 3) ≦ (Y / 2), that is, (2/3) × e ≦ Y ≦ e, and (d) shows (Y / 4 ) ≦ (e / 3) ≦ (Y / 3), ie, e ≦ Y ≦ (4/3) × e, where (e) is (Y / 5) ≦ (e / 3) ≦ (Y / 4) That is, the case where (4/3) × e ≦ Y ≦ (5/3) × e is shown, (F) shows the case of (Y / 6) ≦ (e / 3) ≦ (Y / 5), that is, (5/3) × e ≦ Y ≦ (2 × e). It is a figure which shows an optical model in case of (e / 3) = (Y / 2), ie, Y = (2/3) * e. It is a figure which shows an optical model in the case of (e / 3) = (Y / 4), ie, Y = (4/3) * e. It is a graph which shows Formula 53 thru | or Formula 60 by taking the value of (e / 3) and the value of Y on a horizontal axis | shaft, and taking stereoscopic vision probability PR on a vertical axis | shaft. (A) And (b) is a perspective view which shows the mobile phone which concerns on the modification of 1st Embodiment, (a) shows the case where a stereo image display apparatus is used by normal arrangement | positioning, (b) is The case where it rotates 90 degrees and is used is shown. It is a flowchart figure which shows the operation | movement which switches a display image with the arrangement | positioning direction of a stereo image display apparatus in this modification. It is an optical model figure at the time of arrange | positioning a stereoscopic image display apparatus so that a 1st direction may turn into a viewer's binocular direction in the stereoscopic image display apparatus which concerns on the 2nd Embodiment of this invention. It is an optical model figure at the time of arrange | positioning a stereoscopic image display apparatus so that a 2nd direction may turn into an observer's binocular direction in the stereoscopic image display apparatus which concerns on the 2nd Embodiment of this invention. It is an optical model figure at the time of arrange | positioning a stereoscopic image display apparatus so that a 1st direction may turn into an observer's binocular direction in the stereoscopic image display apparatus which concerns on the 3rd Embodiment of this invention. It is an optical model figure at the time of arrange | positioning a stereoscopic image display apparatus so that a 2nd direction may turn into an observer's binocular direction in the stereoscopic image display apparatus which concerns on the 3rd Embodiment of this invention. It is a perspective view which shows the three-dimensional image display apparatus concerning the 4th Embodiment of this invention. It is an optical model figure which shows the cross section by the C-C 'line | wire shown in FIG. It is an optical model figure which shows the cross section by the D-D 'line | wire shown in FIG. It is a perspective view which shows the three-dimensional image display apparatus which concerns on the modification of the 4th Embodiment of this invention. It is a perspective view which shows the three-dimensional image display apparatus which concerns on the 5th Embodiment of this invention. It is a perspective view which shows the three-dimensional image display apparatus which concerns on the 6th Embodiment of this invention. FIG. 26 is an optical model diagram showing a cross section taken along line E-E ′ shown in FIG. 25. FIG. 26 is an optical model diagram showing a cross section taken along line F-F ′ shown in FIG. 25. It is a perspective view which shows the three-dimensional image display apparatus which concerns on the 7th Embodiment of this invention. It is a perspective view which shows a lenticular lens. It is an optical model figure which shows the three-dimensional image display method which uses the conventional lenticular lens. It is an optical model diagram of a conventional binocular stereoscopic image display device of a lenticular lens type. It is the optical model figure which showed the observation range of the conventional lenticular lens system twin-lens stereoscopic image display apparatus. It is an optical model figure which shows the stereoscopic image display method using the conventional parallax barrier. It is an optical model diagram of a binocular stereoscopic image display apparatus provided with a slit-shaped parallax barrier on the viewer side of a conventional display panel. It is an optical model diagram of a binocular stereoscopic image display device provided with a slit-like parallax barrier on the back surface of a conventional display panel. It is a perspective view which shows a fly eye lens.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Stereoscopic image display apparatus 2; Display panel 3; Fly eye lens 3a, 3b, 3c; Lens element 6; Shading part 7; Parallax barrier 8; Second direction 30, 31, 33, 35; range 32, 34, 36; intersection 51, 52; lenticular lens 61; left eye 62; right eye 63; midpoint 104; observer 105; parallax barrier 105a; slit 106 Display panel 107; Stereoscopic visible region 107a; Diagonal intersection 107b; Optimal observation surface 108; Light source 112; Lateral direction 121; Lenticular lens 122; Cylindrical lens (convex part)
123; right eye pixel 124; left eye pixel 125; fly eye lens 141; right eye 142; left eye 143; middle point 171 of right eye 141 and left eye 142; right eye region 172; left eye region 181, 182 Luminous flux 401; red pixel A
402; red pixel B
403; red pixel C
404; red pixel D
405; Green pixel A
406; green pixel B
407; Green pixel C
408; green pixel D
409; Blue pixel A
410; blue pixel B
411; Blue pixel C
412; Blue pixel D
413; Blue-green pixel A
414; Blue-green pixel B
415; Blue-green pixel C
416; Blue-green pixel D
e: Width of the enlarged projection area of the pixel EL, EL0, EL1, EL2, ER, ER0, ER1, ER3; region H; distance between the apex of the lens and the pixel L; lens pitch OD; optimum viewing distance P; Arrangement pitch Y: observer's binocular distance

Claims (14)

A display panel in which display units including pixels for displaying an image for the right eye and a plurality of pixels for displaying an image for the left eye are arranged in a matrix in a first direction and a second direction orthogonal to the first direction; The light emitted from the pixels arranged in the first direction is distributed in different directions along the first direction, and the light emitted from the pixels arranged in the second direction is arranged along the second direction. Optical means that distributes the images in different directions, and the pixels that display the right-eye image and the pixels that display the left-eye image are each color-coded into Z colors (Z is an integer of 2 or more). The pixels of the same color are continuously arranged along the first direction, and the optical means is composed of a plurality of optical elements arranged in a matrix in the first direction and the second direction, Each optical element is in the first direction And two pixels in the two pixels the second direction are provided corresponding to the four pixels arranged in a matrix, observing the light emitted from pixels for displaying an image for the right eye thereby emitted toward the user the right eye, the image light emitted from pixels for displaying for the left eye and emitted toward the left eye of the observer, the observer's right and left eyes of When a midpoint is located in a predetermined area, a stereoscopic visible range is formed, which is a stereoscopically visible area, and the pixel pitch in the second direction is 1 / Z of the pixel pitch in the first direction. There, the distance between the position and the optical means before Symbol the length of the three-dimensional visible range along the first direction or the second direction is the longest and best viewing distance, the distance between both eyes Y of the observer 62 to set in the range of 65 (mm), magnification of the first way of said optical means And the second direction are substantially the same, the enlarged projection width of pixels in the first direction at a position where the distance from the optical means is the optimum viewing distance and e (mm), the second direction A stereoscopic image display device in which the enlarged projection width is set so that the optical means establishes the following mathematical expression, where e / Z (mm) is an enlarged projection width of a pixel and k is a natural number.

The Z color in which the pixel for displaying the right eye image and the pixel for displaying the left eye image are color-coded is three colors, and the display unit is six pixels in the second direction. the stereoscopic image display device according to claim 1, characterized in that the two pixels in the first direction is constituted of 12 pixels arranged in a matrix. The stereoscopic image display apparatus according to claim 2, wherein the following mathematical formula is satisfied.

The stereoscopic image display apparatus according to claim 2, wherein the binocular interval Y and the enlarged projection width e satisfy the following mathematical formula.

The stereoscopic image display apparatus according to claim 2, wherein the binocular interval Y and the enlarged projection width e satisfy the following mathematical formula.

The stereoscopic image display device according to claim 1, wherein the following mathematical formula is satisfied.
Y / 6 <e / 3 The optical means comprises a fly-eye lens in which the optical elements are arranged in the same plane, and the arrangement pitch of the optical elements in the second direction is smaller than the arrangement pitch in the first direction, and the curvature of the optical elements 7. The stereoscopic image display device according to claim 1, wherein a radius is substantially the same in the first direction and the second direction . 8.   7. The stereoscopic image display device according to claim 1, wherein the optical means is a parallax barrier in which a plurality of pinhole-shaped openings are formed in a matrix.   The optical means includes a first parallax barrier having a plurality of slit-like openings whose longitudinal direction extends in the first direction, and a plurality of slit-like openings whose longitudinal direction extends in the second direction. The stereoscopic image display device according to claim 1, further comprising a second parallax barrier formed.   When the first direction is arranged so as to coincide with the direction from the right eye to the left eye of the observer, the right eye image and the pair of pixels arranged in the first direction in each display unit, respectively. A left-eye image is displayed and different images are displayed on a plurality of pixels arranged in the second direction within each display unit, and the second direction is a direction from the viewer's right eye toward the left eye. Are displayed on a pair of pixels arranged in the second direction in each display unit, respectively, and a right-eye image and a left-eye image are displayed in each display unit. The stereoscopic image display device according to any one of claims 1 to 9, wherein different images are displayed on a plurality of pixels arranged in one direction.   A mobile terminal device comprising: a main body portion; and the stereoscopic image display device according to claim 1 connected to the main body portion.   The mobile terminal device according to claim 11, wherein the stereoscopic image display device is rotatably connected to the main body.   Detecting means for detecting an arrangement direction of the stereoscopic image display apparatus with respect to the main body, and the stereoscopic image display apparatus includes a pixel for displaying the right-eye image and a left-eye display based on a detection result of the detection means; The mobile terminal device according to claim 11 or 12, wherein an arrangement direction of pixels for displaying the image is switched between the first direction and the second direction.   The mobile terminal device according to claim 11, wherein the mobile terminal device is a mobile phone, a mobile terminal, a PDA, a game machine, a digital camera, or a digital video.

Images