JP7048045B2 - Liquid crystal display module for naked eye 3D - Google Patents

Description

The present invention relates to a lenticular lens sheet for naked eye 3D and a liquid crystal display module for naked eye 3D.

In recent years, a 3D liquid crystal display device that can visually recognize a stereoscopic image without the need for special glasses has been proposed. This 3D liquid crystal display device displays an image with parallax between the left and right eyes to the viewer to show the image in three dimensions.

As this 3D liquid crystal display device, for example, a lenticular lens sheet is arranged on the surface side of a liquid crystal panel in which pixels for the right eye for displaying a disparity image for the right eye and pixels for the left eye for displaying a disparity image for the left eye are arranged in a stripe shape. The lenticular lens method is adopted. In this lenticular lens type 3D liquid crystal display device, the parallax image displayed from the right eye pixel is visually recognized by the viewer's right eye via the lenticular lens sheet, and the parallax image displayed from the left eye pixel is visually recognized by the viewer's left eye. A stereoscopic image is displayed to this viewer by visually recognizing the lens (see Japanese Patent Application Laid-Open No. 2012-68500).

Japanese Unexamined Patent Publication No. 2012-68500

However, the conventional 3D liquid crystal display device described in the above publication cannot sufficiently expand the viewing range, and if the viewer slightly shifts to the left or right from the center of the liquid crystal panel, crosstalk may occur. Further, in this conventional 3D liquid crystal display device, when the size of the liquid crystal panel becomes large, the parallax image for the left eye is incident on the right eye, and the parallax image for the right eye is incident on the left eye, which may cause ghosting.

The present invention has been made based on such circumstances, and an object of the present invention is to provide a lenticular lens sheet for naked eye 3D and a naked eye 3D liquid crystal display module capable of sufficiently expanding the viewing range.

The lenticular lens sheet for naked eye 3D according to one aspect of the present invention made to solve the above problems is a lenticular lens sheet for naked eye 3D arranged on the surface side of the liquid crystal panel and having a cylindrical lens group parallel to the surface. Therefore, the radius of curvature of the plurality of cylindrical lenses constituting the above cylindrical lens group is larger on the outer side than in the center in the parallel direction.

Further, the liquid crystal display module for naked eyes 3D according to one aspect of the present invention, which has been made to solve the above problems, includes a liquid crystal panel and the lenticular lens sheet disposed on the surface side of the liquid crystal panel.

The lenticular lens sheet for naked eye 3D and the liquid crystal display module for naked eye 3D of the present invention can sufficiently expand the viewing range.

It is a schematic perspective view which shows the lenticular lens sheet for naked eyes 3D which concerns on one Embodiment of this invention. It is a schematic front view seen from the ridge line direction of the cylindrical lens of the lenticular lens sheet for naked eyes 3D of FIG. It is a schematic front view seen from the ridge line direction of the cylindrical lens of the lenticular lens sheet for naked eyes 3D which concerns on the form different from the lenticular lens sheet for naked eyes 3D of FIG. It is a schematic diagram which shows the liquid crystal display module for a naked eye 3D provided with the lenticular lens sheet for a naked eye 3D of FIG. It is a schematic diagram which shows the image display mechanism of the liquid crystal display module for naked eyes 3D of FIG. It is a schematic diagram which shows the liquid crystal display module for naked eyes 3D which concerns on the form different from the liquid crystal display module for naked eyes 3D of FIG. It is a schematic diagram which shows the positional relationship of the liquid crystal panel and the transparent display panel in the thickness direction view of the liquid crystal panel of the liquid crystal display module for naked eye 3D of FIG. It is a schematic perspective view which shows the display state of the 3D image of the liquid crystal display module for naked eyes 3D of FIG. No. It is a graph which shows the visibility range of the liquid crystal display device of 1. No. It is a schematic diagram which shows the analysis target position of 1 liquid crystal display device. No. 2 is a graph showing the visual range of the liquid crystal display device 2. No. 3 is a graph showing the visual range of the liquid crystal display device 3. No. 4 is a graph showing the visual range of the liquid crystal display device of No. 4.

[Explanation of Embodiment of the present invention]
First, embodiments of the present invention will be listed and described.

The lenticular lens sheet for naked eye 3D according to one aspect of the present invention is a lenticular lens sheet for naked eye 3D arranged on the surface side of the liquid crystal panel and having a cylindrical lens group parallel to the surface, and constitutes the above cylindrical lens group. The radius of curvature of the plurality of cylindrical lenses is larger on the outside than in the center in the parallel direction.

In the lenticular lens sheet for naked eye 3D, the radius of curvature of a plurality of cylindrical lenses constituting the cylindrical lens group increases from the center to the outside in the parallel direction. Therefore, the lenticular lens sheet for naked eye 3D has a higher function of focusing the image emitted from the liquid crystal panel toward the center side of the outer cylindrical lens in the parallel direction than the cylindrical lens in the center of the parallel direction. As a result, the visible range of the lenticular lens sheet for naked eyes 3D can be expanded.

It is preferable that the cylindrical lens group has a plurality of regions having a common radius of curvature of the cylindrical lenses in the parallel direction, and the plurality of regions are provided symmetrically with respect to the center in the parallel direction. As described above, the cylindrical lens group has a plurality of regions having a common radius of curvature of the cylindrical lenses in the parallel direction, and the plurality of regions are provided symmetrically with respect to the center in the parallel direction. The visible range can be easily and surely expanded by facilitating the formation of the cylindrical lens group.

It is preferable that the number of the plurality of regions is an odd number of 9 or less. As described above, when the number of the plurality of regions is an odd number of 7 or less, a highly accurate cylindrical lens group can be easily formed, and the viewing range can be expanded more easily and surely.

The difference in the radius of curvature of the cylindrical lens in the adjacent region is preferably 30 μm or less. As described above, when the difference in the radius of curvature of the cylindrical lens in the adjacent region is not more than the upper limit, it is possible to suppress the occurrence of a striped pattern in the image.

It is preferable that the heights of the vertices of the above cylindrical lens group are equal. In this way, by having the heights of the vertices of the cylindrical lens group equal to each other, it is possible to suppress the occurrence of a striped pattern in the image.

Further, the liquid crystal display module for naked eyes 3D according to another aspect of the present invention includes a liquid crystal panel and the lenticular lens sheet disposed on the surface side of the liquid crystal panel.

Since the liquid crystal display module for naked eyes 3D includes the lenticular lens sheet, the viewing range can be expanded.

The liquid crystal display module for naked eyes 3D may further include a transparent display panel arranged on the surface side of the lenticular lens sheet. As described above, by further providing the transparent display panel arranged on the surface side of the lenticular lens sheet, the perspective effect of the 3D image can be enhanced by utilizing the shielding function of the transparent display panel.

The distance between the lenticular lens sheet and the transparent display panel is preferably 5 cm or more and 15 cm or less. As described above, when the distance between the lenticular lens sheet and the transparent display panel is within the above range, it is easy to display the 3D image on the surface side of the transparent display panel, and the 3D image can be easily displayed. It is possible to guide the line of sight of the viewer.

The liquid crystal panel may be included in the transparent display panel in the thickness direction of the liquid crystal panel. As described above, the liquid crystal panel is included in the transparent display panel in the thickness direction of the liquid crystal panel, so that the area that does not overlap with the liquid crystal panel of the transparent display panel is set as the shielding area. The line of sight of the viewer can be guided to the 3D image.

In the present invention, the "front surface side" means the viewer side in a state of being incorporated in the liquid crystal display device. Further, the "surface" means a surface on the viewer side in a state of being incorporated in the liquid crystal display device. "The heights of the vertices of the cylindrical lens group are equal" means that the difference between the highest apex position and the lowest apex position of a plurality of cylindrical lenses constituting the cylindrical lens group is 20 μm or less, preferably 10 μm. Hereinafter, it is more preferably 5 μm or less. The "distance between the lenticular lens sheet and the transparent display panel" means the shortest distance between the lenticular lens sheet and the transparent display panel in the thickness direction.

[Details of Embodiments of the present invention]
Hereinafter, embodiments of the lenticular lens sheet for naked eye 3D and the liquid crystal display module for naked eye 3D according to the present invention will be described in detail with reference to the drawings.

[First Embodiment]
<Lenticular lens sheet for naked eye 3D>
The lenticular lens sheet for naked eye 3D (hereinafter, also simply referred to as “lenticular lens sheet 1”) of FIG. 1 is arranged on the surface side of a liquid crystal panel (not shown) and has two groups of cylindrical lenses parallel to the surface. The lenticular lens sheet 1 displays a 2 parallax 3D image by transmitting the image light emitted from the liquid crystal panel. Specifically, the lenticular lens sheet 1 is arranged on the surface side of a liquid crystal panel in which pixels for the right eye displaying a parallax image for the right eye and pixels for the left eye displaying a parallax image for the left eye are arranged in a stripe shape. The parallax image displayed from the pixel for the right eye is visually recognized by the right eye of the viewer, and the parallax image displayed from the pixel for the left eye is visually recognized by the left eye of the viewer, thereby displaying the stereoscopic image to the viewer.

In the lenticular lens sheet 1, the radius of curvature of the plurality of cylindrical lenses 2a constituting the cylindrical lens group 2 is larger on the outer side than in the center in the parallel direction of the cylindrical lens group 2. Specifically, in the lenticular lens sheet 1, the radius of curvature of the plurality of cylindrical lenses 2a in the parallel direction is gradually increased from the center to the outside.

In the lenticular lens sheet 1, the radius of curvature of the plurality of cylindrical lenses 2a constituting the cylindrical lens group 2 increases from the center to the outside in the parallel direction. Therefore, the lenticular lens sheet 1 has a higher function of focusing the image emitted from the liquid crystal panel toward the center of the cylindrical lens 2a on the outer side in the parallel direction than on the cylindrical lens 2a in the center of the parallel direction. As a result, the lenticular lens sheet 1 can expand the viewing range.

The lenticular lens sheet 1 has a cylindrical lens array layer 3 having a cylindrical lens group 2 on the front surface thereof, and a base material layer 4 laminated on the back surface side of the cylindrical lens array layer 3. The "back side" means the side opposite to the viewer side in the state of being incorporated in the liquid crystal display device.

The lower limit of the size of the lenticular lens sheet 1 is preferably 15 inches, more preferably 17 inches. On the other hand, as the upper limit of the above size, 27 inches is preferable, and 21.5 inches is more preferable. If the size is smaller than the lower limit, the effect of expanding the viewing range may not be noticeable. On the contrary, if the size exceeds the upper limit, it may be difficult to use it as a liquid crystal display device for naked-eye 3D, which requires the focal length to be adjusted for visual recognition.

(Cyrindrical lens array layer)
The cylindrical lens array layer 3 has a cylindrical lens group 2 having a plurality of cylindrical lenses 2a arranged in parallel on the surface thereof. The ridge lines of the plurality of cylindrical lenses 2a are arranged in the vertical direction while being incorporated in the liquid crystal display device. As shown in FIG. 2, the cylindrical lens group 2 has a plurality of viewing range control regions R having a common radius of curvature of the cylindrical lens 2a in the parallel direction. One viewing range control area R is provided in the central portion in the parallel direction, and the other viewing range control area R is provided symmetrically with respect to the viewing range control area R in the central portion. As a result, the lenticular lens sheet 1 is provided with a plurality of viewing range control regions R symmetrically with respect to the center in the parallel direction. The lenticular lens sheet 1 is provided with a plurality of viewing range control regions R symmetrically with respect to the center in the parallel direction, so that the refraction angle of the image light is provided for each viewing range control region R toward the center side in the parallel direction. Can be adjusted. Since the lenticular lens sheet 1 has a high function of condensing light toward the center as much as the cylindrical lens 2a of the outer viewing range control area R, the image light for the right eye emitted from the liquid crystal panel is focused on the right eye of the viewer. It is easy to focus and focus the image light for the left eye on the focal point corresponding to the left eye of the viewer. Since the radius of curvature of the cylindrical lens 2a may be set for each viewing range control region R in the lenticular lens sheet 1, the viewing range can be easily and surely expanded while facilitating the formation of the cylindrical lens group 2. Can be done.

The number of the plurality of viewing range control areas R is preferably an odd number of 9 or less. That is, the number of the plurality of viewing range control areas R is preferably 3, 5, 7 or 9. If the number of the plurality of viewing range control regions R exceeds the above upper limit, it may be difficult to form the cylindrical lens group 2. As the lower limit of the number of the plurality of viewing range control areas R, 7 is more preferable from the viewpoint of improving the viewing range expanding effect.

The plurality of cylindrical lenses 2a are arranged so as to project toward the surface side from the same virtual plane. Further, the height of the cylindrical lens 2a is higher as the radius of curvature is smaller. Therefore, as shown in FIG. 2, the vertex heights of the plurality of cylindrical lenses 2a in each viewing range control area R are equal, and the vertex height is as low as that of the cylindrical lens 2a in the outer viewing range control area R in the parallel direction. .. In the lenticular lens sheet 1, since a plurality of cylindrical lenses 2a are arranged on the surface side from the same virtual plane, it is easy to form the cylindrical lens group 2.

The curved surface shape of the surface of each cylindrical lens 2a in the direction perpendicular to the ridge line may be, for example, an elliptical arc shape, but an arc shape is preferable. Since the curved surface has an arcuate shape, it can be easily used as a lenticular lens for biparallax.

The radius of curvature of the plurality of cylindrical lenses 2a in the visible range control region R provided in the central portion in the parallel direction varies depending on the size of the lenticular lens sheet 1, but can be, for example, 350 μm or more and 430 μm or less. Further, the upper limit of the difference (absolute value) in the radius of curvature of the cylindrical lens 2a in the adjacent viewing range control region R is preferably 30 μm, more preferably 20 μm, still more preferably 10 μm. If the difference in the radius of curvature exceeds the upper limit, a striped pattern may occur in the image due to the difference in the radius of curvature of the cylindrical lens 2a between the viewing range control regions R. The lower limit of the difference in the radius of curvature is not particularly limited, but is preferably 3 μm, more preferably 5 μm, from the viewpoint of effectively obtaining the function of expanding the viewing range.

The difference in the radius of curvature of the cylindrical lens 2a in the adjacent viewing range control areas R may be equal among all the viewing range control areas R. According to this configuration, it is easy to suppress the generation of a striped pattern due to the difference in the radius of curvature of the cylindrical lens 2a between the visible range control regions R. On the other hand, the difference in the radius of curvature may be larger as it is between the adjacent viewing range control regions R outside the parallel direction. According to this configuration, the image light emitted from the liquid crystal panel can be easily focused on the center side in the parallel direction.

It is preferable that the pitches of the plurality of cylindrical lenses 2a are equal. In the conventional lenticular lens sheet, the pitches of a plurality of cylindrical lenses are adjusted according to the pixels for the right eye and the pixels for the left eye of the liquid crystal panel. On the other hand, since the lenticular lens sheet 1 can adjust the refraction angle of the cylindrical lens 2a for each viewing range control region R, even if the pitches of the plurality of cylindrical lenses 2a are equalized, a 3D image can be displayed to the viewer. It can be displayed accurately. When the pitches of the plurality of cylindrical lenses 2a are equal, the pitch may be, for example, 150 μm or more and 300 μm or less, although it varies depending on the size of the lenticular lens sheet 1.

As the lower limit of the width of the plurality of viewing range control areas R, 5 cm is preferable, and 7 cm is more preferable. On the other hand, as the upper limit of the width of the viewing range control area R, 10 cm is preferable, and 8 cm is more preferable. If the width is smaller than the lower limit, the number of the viewing range control regions R becomes too large, and it may be difficult to form the cylindrical lens group 2. On the contrary, if the width exceeds the upper limit, the effect of expanding the viewing range may not be sufficiently obtained.

The cylindrical lens array layer 3 contains a synthetic resin as a main component. Examples of the synthetic resin include thermoplastic resins such as polyester, acrylic resin, polycarbonate, polyolefin and polyamide, and active energy ray-curable resins such as acrylate-based and epoxy-based resins. When the main component of the cylindrical lens array layer 3 is the above-mentioned thermoplastic resin, examples of the method for producing the cylindrical lens array layer 3 include a melt extrusion method, an injection molding method, and a hot pressing method. On the other hand, when the main component of the cylindrical lens 3 is the active energy ray-curable resin, the method for producing the cylindrical lens array layer 3 is, for example, an uncured activity on the surface of a substrate film or a substrate layer 4 described later. A method of applying an energy ray-curable resin and irradiating the surface of the active energy ray-curable resin with active energy rays in a state where a molding die having an inverted shape of the cylindrical lens group 2 is pressed. The "main component" refers to a component having the highest content, for example, a component contained in an amount of 50% by mass or more.

The lower limit of the average thickness of the cylindrical lens array layer 3 is preferably 50 μm, more preferably 70 μm. On the other hand, as the upper limit of the average thickness of the cylindrical lens array layer 3, 5 mm is preferable, and 1 mm is more preferable. If the average thickness is smaller than the lower limit, it may be difficult to form the cylindrical lens group 2 having an appropriate radius of curvature. On the contrary, if the average thickness exceeds the upper limit, the lenticular lens sheet 1 may become unnecessarily thick. The "average thickness of the cylindrical lens array layer" means the average distance from the back surface of the cylindrical lens array layer to the vertices of a plurality of cylindrical lenses.

(Base layer)
The base material layer 4 constitutes a support for the cylindrical lens array layer 3. Examples of the material of the base material layer 4 include synthetic resin and glass. Further, as the synthetic resin, for example, the thermoplastic resin mentioned as the main component of the cylindrical lens array layer 3 can be mentioned. When a synthetic resin is used as the main component of the base material layer 4, the cylindrical lens array layer 3 and the base material layer 4 may be formed separately and then laminated, or may be integrally formed by integral molding. When the base material layer 4 and the cylindrical lens array layer 3 are formed separately, the base material layer 4 and the cylindrical lens array layer 3 can be adhered to each other by, for example, an adhesive. Examples of this adhesive include acrylic adhesives, silicone adhesives, polyester adhesives, rubber adhesives and the like.

The lower limit of the average thickness of the base material layer 4 is preferably 50 μm, more preferably 100 μm. On the other hand, as the upper limit of the average thickness of the base material layer 4, 5 mm is preferable, and 1 mm is more preferable. If the average thickness is smaller than the lower limit, the strength of the base material layer 4 becomes insufficient, and the cylindrical lens array layer 3 may not be accurately supported. On the contrary, when the average thickness exceeds the upper limit, the base material layer 4 becomes unnecessarily thick, and the weight of the lenticular lens sheet 1 may become heavy or the handleability may be insufficient.

[Second Embodiment]
<Lenticular lens sheet for naked eye 3D>
The lenticular lens sheet for naked eye 3D (hereinafter, also simply referred to as “lenticular lens sheet 11”) of FIG. 3 is arranged on the surface side of a liquid crystal panel (not shown) and has a cylindrical lens group 12 parallel to the surface. In the lenticular lens sheet 11, the radius of curvature of the plurality of cylindrical lenses 12a constituting the cylindrical lens group 12 is larger on the outer side than in the center in the parallel direction. Specifically, in the lenticular lens sheet 11, the radius of curvature of the plurality of cylindrical lenses 12a in the parallel direction is gradually increased from the center to the outside.

The lenticular lens sheet 11 has a cylindrical lens array layer 13 on which a cylindrical lens group 12 is arranged on the front surface, and a base material layer 4 laminated on the back surface side of the cylindrical lens array layer 13. The lenticular lens sheet 11 has the same configuration as the lenticular lens sheet 1 of FIG. 1 except that the heights of the vertices of the cylindrical lens group 12 are equal.

In the lenticular lens sheet 11, a plurality of cylindrical lenses 12a are arranged so as to project toward the surface side from different virtual planes for each viewing range control region R. The lenticular lens sheet 11 is designed so that the heights of the vertices of the cylindrical lens group 12 become equal by adjusting the virtual plane for each viewing range control area R.

If the height of the apex of the cylindrical lens is different for each viewing range control area, a striped pattern is likely to occur in a portion corresponding to the boundary of the adjacent viewing range control area when the liquid crystal display device displays an image. On the other hand, in the lenticular lens sheet 11, the heights of the vertices of the cylindrical lens group 12 are the same, so that it is possible to suppress the occurrence of a striped pattern in the image. Further, in the lenticular lens sheet 11, in addition to making the vertex heights of the cylindrical lens group 12 equal, the difference in the radius of curvature of the cylindrical lens 12a in the adjacent viewing range control region R is controlled within the above range. , It is possible to more reliably suppress the occurrence of striped patterns in the image.

[Third Embodiment]
<LCD module for naked eye 3D>
The liquid crystal display module 21 for naked eye 3D of FIG. 4 includes a liquid crystal panel 22 and the lenticular lens sheet 1 disposed on the surface side of the liquid crystal panel 22. Further, the liquid crystal display module 21 for naked eye 3D is a first polarizing plate 23 arranged between the liquid crystal panel 22 and the lenticular lens sheet 1, and a second polarizing plate 24 arranged on the back surface side of the liquid crystal panel 22. Has. The 3D liquid crystal display module 21 is configured to be able to switch and display a 3D image and a 2D image. A backlight unit (not shown) for the liquid crystal display module is arranged on the back surface side of the liquid crystal display module 21 for naked eyes 3D. As this backlight unit, a known configuration can be adopted. The backlight unit includes, for example, a light guide plate, a light source that irradiates an end surface of the light guide plate with light rays, and one or a plurality of optical sheets laminated on the surface side of the light guide plate. Alternatively, a direct-type backlight unit or the like having a diffuser plate, a light source arranged on the back surface side of the diffuser plate, and one or more optical sheets arranged on the front surface side of the diffuser plate can be adopted. be.

The liquid crystal panel 22 has a pair of glass substrates arranged at intervals. The liquid crystal panel 22 has a sealing member that connects the edges of the pair of glass substrates. A liquid crystal display is enclosed between the pair of glass substrates. Further, the liquid crystal panel 22 has a color filter on one of the glass substrates. The color filter has a color region corresponding to each pixel. The liquid crystal panel 22 is alternately arranged with pixels for the right eye that display the parallax image for the right eye and pixels for the left eye that display the parallax image for the left eye. The right-eye pixel and the left-eye pixel are provided at a pitch corresponding to the pitch of the plurality of cylindrical lenses in the above-mentioned parallel direction. In the liquid crystal display module 21 for naked eyes 3D, as shown in FIG. 5, the right-eye parallax image displayed from the liquid crystal panel 22 is refracted by the lenticular lens sheet 1 and is visually recognized by the viewer's right eye, while the liquid crystal panel 22. The left-eye parallax image displayed from is refracted by the lenticular lens sheet 1 and is visually recognized by the viewer's left eye. As a result, the naked-eye 3D liquid crystal display module 21 can display a stereoscopic image to the viewer.

Since the liquid crystal display module 21 for naked eyes 3D includes the lenticular lens sheet 1, the viewing range can be expanded.

[Fourth Embodiment]
<LCD module for naked eye 3D>
The liquid crystal display module 31 for naked eye 3D of FIG. 6 has a liquid crystal panel 22, a lenticular lens sheet 1 arranged on the surface side of the liquid crystal panel 22, and a transparent display arranged on the surface side of the lenticular lens sheet 1. A panel 32 is provided. Further, the liquid crystal display module 31 for naked eye 3D is a first polarizing plate 23 arranged between the liquid crystal panel 22 and the lenticular lens sheet 1, and a second polarizing plate 24 arranged on the back surface side of the liquid crystal panel 22. Has. That is, the naked-eye 3D liquid crystal display module 31 includes a transparent display panel 32 on the surface side of the naked-eye 3D liquid crystal display module 21 of FIG. The liquid crystal display module 31 for naked eye 3D has the same configuration as the liquid crystal display module 21 for naked eye 3D in FIG. 4 except that the transparent display panel 32 is arranged on the surface side of the lenticular lens sheet 1. Only the transparent display panel 32 will be described.

Since the naked-eye 3D liquid crystal display module 31 includes the transparent display panel 32 on the surface side of the lenticular lens sheet 1, the perspective effect of the 3D image can be enhanced by utilizing the shielding function of the transparent display panel 32. More specifically, in the conventional liquid crystal display module for naked eye 3D, the pitch of a plurality of cylindrical lenses is adjusted according to the right eye pixel and the left eye pixel of the liquid crystal panel, so that the position of the lenticular lens sheet and the liquid crystal panel is displaced. It has been difficult to secure a sufficient amount of pop-out of the 3D image because the 3D image is liable to collapse due to the visual position of the viewer and the like. On the other hand, the liquid crystal display module 31 for naked eye 3D can suppress the positional deviation between the lenticular lens sheet 1 and the liquid crystal panel 22 and the collapse of the 3D image based on the visual position of the viewer, so that the 3D image can be suppressed. It is easy to increase the amount of pop-out. Therefore, since the liquid crystal display module 31 for naked eyes 3D can display a 3D image protruding from the surface side of the transparent panel 32, the perspective effect of the 3D image can be enhanced by utilizing the shielding function of the transparent display panel 32. Can be done.

(Transparent display panel)
The transparent display panel 32 is a transparent liquid crystal panel. The transparent display panel 32 has a rectangular shape in a plan view (thickness direction view). The transparent display panel 32 has, for example, a liquid crystal layer, a pair of transparent electrodes laminated on both sides of the liquid crystal layer, and a pair of transparent substrates laminated on the outer surface side of the pair of transparent electrodes. The transparent display panel 32 is arranged in parallel with the liquid crystal panel 22. The transparent display panel 32 may also serve as a front surface panel arranged on the outermost surface of a display device (not shown) on which the liquid crystal display module 31 for naked eyes 3D is mounted, and is arranged on the back surface side of the front surface panel. May be good.

As shown in FIG. 7, the transparent display panel 32 is arranged so as to cover the entire surface side region of the liquid crystal panel 22. The transparent display panel 32 has a first region 32a that covers the surface side of the liquid crystal panel 22, and a second region 32b that does not overlap with the liquid crystal panel 22. The second region 32b is configured in a frame shape, more specifically in a square ring shape, so as to surround the first region 32a. As a result, the liquid crystal panel 22 is included in the transparent display panel 32 in the thickness direction of the liquid crystal panel 22.

The transparent display panel 32 makes the first region 32a transparent and the second region 32b translucent or opaque depending on the voltage application state, and both the first region 32a and the second region 32b are translucent. Alternatively, it is configured to be controllable with a second state of making it opaque. When the transparent display panel 32 is translucent or opaque, the transparent display panel 32 may display contents such as images and characters in the translucent or opaque area.

The liquid crystal display module 31 for naked eye 3D covers the second region 32b as a shielding region (semi-transparent or opaque region) by including the liquid crystal panel 22 in the transparent display panel 32 in the thickness direction view of the liquid crystal panel 22. By doing so, the line of sight of the viewer can be guided to the 3D image. More specifically, since the liquid crystal display module 31 for naked eyes 3D can increase the amount of protrusion of the 3D image, the 3D image X is displayed on the surface side of the transparent display panel 32 as shown in FIG. be able to. At this time, the first region 32a covering the surface side of the liquid crystal panel 22 is used as a transparent region, and the second region 32b surrounding the first region 32a is used as a shielding region, so that the second region 32b enhances the perspective effect of the 3D image. By using it as a medium, the line of sight of the viewer can be guided to the 3D image.

The lower limit of the distance between the lenticular lens sheet 1 and the transparent display panel 32 is preferably 5 cm, more preferably 7 cm. On the other hand, the upper limit of the interval is preferably 15 cm, more preferably 10 cm. If the interval does not meet the lower limit, for example, the perspective effect when the first region 32a of the transparent display panel 32 is made transparent and the 2D image is displayed on both the liquid crystal panel 22 and the second region 32b of the transparent display panel 32 is ineffective. May be sufficient. On the contrary, if the interval exceeds the upper limit, it may be difficult to sufficiently project the 3D image to the surface side of the transparent display panel 32.

[Other embodiments]
It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is not limited to the configuration of the above embodiment, but is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims. To. For example, in the above embodiment, the configuration having a plurality of viewing range control regions having a common radius of curvature of the cylindrical lens has been described. However, in the lenticular lens sheet for naked eye 3D, the radius of curvature of the plurality of cylindrical lenses is from the center to the outside in the parallel direction. It is not always necessary to change the radius of curvature for each viewing range control area as long as it gradually increases.

The lenticular lens sheet for naked eye 3D does not necessarily have to have a base material layer, and may be composed only of a cylindrical lens array layer. Further, in the lenticular lens sheet for naked eyes 3D, the above-mentioned first polarizing plate may be used as a base material layer, and a cylindrical lens array layer may be laminated on the surface side of the first polarizing plate. Further, the liquid crystal display module for naked eye 3D may include the lenticular lens sheet for naked eye 3D shown in FIG.

As the transparent display panel, in addition to the transparent liquid crystal panel described above, a transparent organic EL panel or the like can also be used.

Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples.

[No. 1]
A liquid crystal display including a 19-inch liquid crystal panel for naked eyes 3D having a length of 37.8 cm in the left-right direction and a length of 30.4 cm in the vertical direction, and an edge light type backlight unit arranged on the back surface side of the liquid crystal panel for naked eyes 3D. A display device was prepared. On the surface side of the liquid crystal panel for naked eye 3D, the lenticular lens sheet for naked eye 3D of FIG. 1 having five viewing range control areas divided into five with the same length in the left-right direction was arranged. The radius of curvature of the plurality of cylindrical lenses arranged in the visible range control area in the central portion in the left-right direction of the lenticular lens sheet for naked eye 3D is 402 μm, and the plurality arranged in the pair of visible range control regions provided on the left and right of the central portion. The radius of curvature of the cylindrical lens was 417 μm, and the radius of curvature of the plurality of cylindrical lenses arranged in the pair of visible range control areas provided outside the pair of visible range control areas was 443 μm. The pitch of the adjacent cylindrical lens was 196 μm. No. FIG. 9 shows a viewing range when the image displayed from the liquid crystal display device of No. 1 is visually recognized from the center of the liquid crystal panel and from an appropriate viewing distance. The numbers indicating the analysis target positions in FIG. 9 correspond to the numbers in FIG. 10.

[No. 2]
No. A liquid crystal display device provided with the same naked-eye 3D liquid crystal panel and edge light type backlight unit as in No. 1 was prepared. On the surface side of the liquid crystal panel for naked eye 3D, a lenticular lens sheet for naked eye 3D in which a plurality of cylindrical lenses having a radius of curvature of 424 μm and a pitch of 196 μm are arranged in parallel in the left-right direction is arranged. No. FIG. 11 shows a viewing range when the image displayed from the liquid crystal display device (2) is visually recognized from the center of the liquid crystal panel and from an appropriate viewing distance. The numbers indicating the analysis target positions in FIG. 11 correspond to the numbers in FIG. 10.

<Evaluation result>
As shown in FIG. 9, No. In the liquid crystal display device of No. 1, the viewing range in the left-right direction of the outermost (area a in FIG. 10) of the liquid crystal panel for naked eyes 3D set at a crosstalk value [XT] of 7.5% is ± about 14 mm, and is the maximum. The viewing range in the left-right direction of the viewing area (area b in FIG. 10) provided inside by 1/6 each in the left-right direction and the up-down direction from the outside is ± about 20 mm. On the other hand, No. In the liquid crystal display device of No. 2, the viewing range in the left-right direction of the outermost (area a in FIG. 10) of the liquid crystal panel for naked eyes 3D set at a crosstalk value [XT] of 7.5% is ± about 9 mm, and is the maximum. The viewing range in the left-right direction of the viewing area (area b in FIG. 10) provided inside by 1/6 each in the left-right direction and the up-down direction from the outside is ± about 16 mm. From this, No. The liquid crystal display device of No. 1 is No. Compared with the liquid crystal display device of No. 2, the viewing range is about 1.55 times wider in the a area and about 1.25 times wider in the b area. The crosstalk value [XT] is a numerical value indicating the degree of overlap between the image for the right eye and the image for the left eye, and the smaller the value, the clearer the 3D image. This crosstalk value [XT] is a value measured using a luminance meter manufactured by Konica Minolta.

[No. 3]
A liquid crystal display including a 21.5-inch liquid crystal panel for naked eyes 3D having a length of 47.6 cm in the left-right direction and a length of 26.7 cm in the vertical direction, and an edge light type backlight unit arranged on the back surface side of the liquid crystal panel. I prepared the device. On the surface side of the liquid crystal panel for naked eye 3D, the lenticular lens sheet for naked eye 3D of FIG. 1 having five viewing range control areas divided into five with the same length in the left-right direction was arranged. The radius of curvature of the plurality of cylindrical lenses arranged in the visible range control area in the central part in the left-right direction of the lenticular lens sheet for naked eye 3D is 375.3 μm, and are arranged in a pair of visible range control areas provided on the left and right sides of the central part. The radius of curvature of the plurality of cylindrical lenses was 385.7 μm, and the radius of curvature of the plurality of cylindrical lenses arranged in the pair of visible range control areas provided outside the pair of visible range control areas was 406.5 μm. The pitch of the adjacent cylindrical lenses was 165.1 μm. No. FIG. 12 shows a viewing range when the image displayed from the liquid crystal display device 3 is visually recognized from the center of the liquid crystal panel and from an appropriate viewing distance. The numbers indicating the analysis target positions in FIG. 12 correspond to the numbers in FIG. 10.

[No. 4]
No. A liquid crystal display device provided with a liquid crystal panel for naked eye 3D and an edge light type backlight unit similar to those in No. 3 was prepared. On the surface side of the liquid crystal panel for naked eye 3D, a lenticular lens sheet for naked eye 3D in which a plurality of cylindrical lenses having a radius of curvature of 385 μm and a pitch of 165.1 μm were arranged in parallel in the left-right direction was arranged. No. FIG. 13 shows a viewing range when the image displayed from the liquid crystal display device 4 is visually recognized from the center of the liquid crystal panel and from an appropriate viewing distance. The numbers indicating the analysis target positions in FIG. 13 correspond to the numbers in FIG. 10.

<Evaluation result>
As shown in FIG. 12, No. In the liquid crystal display device of No. 3, the viewing range in the left-right direction of the outermost (area a in FIG. 10) of the liquid crystal panel for naked eyes 3D set at a crosstalk value [XT] of 7.5% is ± about 9 mm, and is the maximum. The viewing range in the left-right direction of the viewing area (area b in FIG. 10) provided inside by 1/6 each in the left-right direction and the up-down direction from the outside is ± about 17 mm. On the other hand, No. In the liquid crystal display device of No. 4, the viewing range in the left-right direction of the outermost (area a in FIG. 10) of the liquid crystal panel for naked eyes 3D set at a crosstalk value [XT] of 7.5% is ± about 6 mm, and is the maximum. The viewing range in the left-right direction of the viewing area (area b in FIG. 10) provided inside by 1/6 each in the left-right direction and the up-down direction from the outside is ± about 14 mm. From this, No. The liquid crystal display device of No. 3 is No. Compared with the liquid crystal display device of No. 4, the viewing range is about 1.5 times wider in the a area and about 1.21 times wider in the b area.

As described above, the lenticular lens sheet for naked eye 3D and the liquid crystal display module for naked eye 3D of the present invention can sufficiently expand the viewing range, and are therefore used in liquid crystal display devices such as gaming machines and medical devices. Is suitable.

1,11 Lenticular lens sheet 2,12 Cylindrical lens group 2a, 12a Cylindrical lens 3,13 Cylindrical lens Array layer 4 Base material layer 21,31 Liquid crystal display module for naked eye 3D 22 Liquid crystal panel 23 First polarizing plate 24 Second polarizing plate 32 Transparent display panel 32a 1st area 32b 2nd area R Visible range control area X 3D image

Claims (8)

LCD panel and
With the lenticular lens sheet arranged on the surface side of the liquid crystal panel
Equipped with
The above lenticular lens sheet
A cylindrical array layer having a cylindrical lens group having a plurality of cylindrical lenses arranged in parallel on the surface thereof is provided.
The radius of curvature of the plurality of cylindrical lenses constituting the cylindrical array layer is gradually increased from the center to the outside in the parallel direction, and the surface opposite to the cylindrical array layer in the lenticular lens sheet is a flat surface. Is
Liquid crystal display module for naked eye 3D . The cylindrical lens group has a plurality of regions in which the radius of curvature of the cylindrical lens is common in the parallel direction.
The liquid crystal display module for naked eyes 3D according to claim 1, wherein the plurality of regions are provided symmetrically with respect to the center in the parallel direction. The liquid crystal display module for naked eyes 3D according to claim 2, wherein the number of the plurality of regions is an odd number of 9 or less. The liquid crystal display module for naked eyes 3D according to claim 2 or 3, wherein the difference in the radius of curvature of the cylindrical lens in the adjacent region is 30 μm or less. The liquid crystal display module for naked eyes 3D according to any one of claims 1 to 4, wherein the heights of the vertices of the cylindrical lens group are equal. The liquid crystal display module for naked eyes 3D according to any one of claims 1 to 5, further comprising a transparent display panel arranged on the surface side of the lenticular lens sheet. The liquid crystal display module for naked eyes 3D according to claim 6 , wherein the distance between the lenticular lens sheet and the transparent display panel is 5 cm or more and 15 cm or less. The liquid crystal display module for naked eyes 3D according to claim 6 or 7 , wherein the liquid crystal panel is included in the transparent display panel in the thickness direction of the liquid crystal panel.

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