Glassless stereoscopic image display device with improved crosstalk through inclined pixel structure

Abstract

A glassless stereoscopic image display device according to an embodiment of the present invention comprises: a display panel on which a plurality of rectangular pixels are arranged in a checkerboard manner; a lenticular lens which is composed of a plurality of convex lenses inclined at a predetermined angle in a predetermined direction with respect to the vertical axis of the display panel and is arranged on the front surface of the display panel; and a processor for controlling the display panel, wherein the plurality of pixels are arranged to be inclined to be parallel to a focal line formed according to the direction and angle in which the convex lenses are inclined, and the focal line is formed to be parallel to the convex lenses and is a set of focal points for a user to view a stereoscopic image.

Description

Glasses-free stereoscopic display device with improved crosstalk through a tilted pixel structure

[0001] The present invention relates to a stereoscopic image display technology field based on a lenticular lens, and more particularly, to a glasses-free stereoscopic image display device in which crosstalk is reduced by designing pixels that are tilted in the same angle as the arrangement angle of a lenticular lens.

[0002] Stereoscopic image display technology reproduces artificial stereoscopic images using flat-panel display hardware. Viewers can now enjoy 3D images on televisions or monitors that implement stereoscopic image display technology, regardless of location.

[0003] The principle of viewing stereoscopic images is based on binocular disparity, which occurs when the human eye is approximately 65mm apart. Consequently, when a person views an object, images are transmitted to the brain at slightly different angles through the left and right eyes, and the brain synthesizes these images, creating a sense of three-dimensionality.

[0004] A stereoscopic image display device implements a virtual three-dimensional effect by simultaneously displaying two images corresponding to the left and right eyes on a two-dimensional display device and accurately transmitting them to the left and right eyes.

[0005] There are two types of stereoscopic display devices: glasses-based and glasses-free, but recently, the glasses-free type, which allows for free viewing without the hassle of glasses, has become the mainstream.

[0006] Glasses-free methods can be divided into lenticular lens methods, parallax barrier methods, integral image methods, and holography methods.

[0007] The lenticular lens method related to the present invention provides separate left-eye and right-eye images by attaching a lenticular lens having cylindrical or semi-cylindrical lenses arranged on the front of the panel. In other words, the left and right images are refracted through the lenticular lens and sent to each eye, respectively.

[0008] Fig. 1 is a drawing for explaining a stereoscopic display device using a lenticular lens method according to the prior art. Referring to Fig. 1(a), a stereoscopic display device according to the prior art is manufactured by vertically attaching a lenticular lens (13) in which semi-cylindrical lenses (12) are continuously arranged on the front surface of a panel in which pixels (11) are arranged in a checkerboard pattern.

[0009] As illustrated in Fig. 1(b), the focal point on the panel is magnified and displayed by each lens (12) from the viewer's perspective. However, when vertically attached, pixel areas of the same color are separated into short sections. Therefore, a severe moire phenomenon occurs, and there is a problem in that it is difficult to transform or compensate for the image according to a change in viewpoint.

[0010] To overcome these problems, a stereoscopic display device with a lenticular lens attached at an angle was manufactured, and an example of its structure is illustrated in Fig. 2. Referring to Fig. 2(a), a state in which a lens (21) is attached at an angle to the front of the panel can be observed. At this time, the degree to which the lens is tilted is called the slanted angle (SA), and the viewer's focus formed on the panel is formed as a focal line (22, 23) parallel to the lens.

[0011] Typically, each pixel is designed to selectively reproduce at least one image from among pre-input images. For example, as illustrated in Fig. 2(b), the image numbers to be reproduced for each pixel can be set in a certain pattern corresponding to the focus position that varies depending on the viewpoint.

[0012] Meanwhile, every pixel along a given focal line must be designed to reproduce the same image, or at least a portion of it. Thus, pixels along the same focal line will display the same image, magnified through the lens.

[0013] However, due to the slanted angle, if the focus line passes through a point far from the center of the pixel, a phenomenon occurs in which adjacent pixels with different image numbers or different colors overlap. For example, referring to Fig. 2(a), in the case of the focus line (22) passing through the pixels set to image number 2, it passes through the red pixels and the green pixels simultaneously in the box area (b) of the fourth layer from the top. In addition, in the case of the focus line (23) passing through the pixels set to image number 4, it passes through the red pixels and the green pixels simultaneously in the box areas (b) of the first and fifth layers from the top. That is, in the box area (b), the focus is formed at a location where an image different from the image of the set number is displayed, resulting in afterimages or crosstalk, which in turn causes a deterioration in product performance.

[0014] The present invention is intended to solve the problems of the prior art described above, and has the purpose of providing a stereoscopic display device with improved performance by minimizing the occurrence of afterimages or crosstalk by arranging pixels at an angle of arrangement of a lenticular lens so as to be parallel to a focal line.

[0015] However, the technical tasks that this embodiment seeks to accomplish are not limited to the technical tasks described above, and other technical tasks may exist.

[0016] According to one embodiment of the present invention, a stereoscopic display device includes a display panel having a plurality of rectangular pixels arranged in a tiled manner; a lenticular lens disposed on a front surface of the display panel, the lenticular lens comprising a plurality of convex lenses inclined at a preset angle in a preset direction with respect to a vertical axis of the display panel; and a processor controlling the display panel, wherein the plurality of pixels are inclined and arranged to be parallel to a focal line formed according to a direction and angle in which the convex lenses are inclined, the focal line being formed parallel to the convex lenses and being a set of focal points for a user to view a stereoscopic image.

[0017] According to one embodiment of the present invention, a stereoscopic display device without glasses is designed such that the width of the convex lens is larger than the width of the pixel.

[0018] According to one embodiment of the present invention, the angle at which the convex lens and the pixel are tilted is 5 to 15 degrees clockwise or counterclockwise.

[0019] According to one embodiment of the present invention, each of the plurality of pixels is composed of three sub-pixels having three different colors, and the sub-pixels constituting one pixel are arranged side by side along the horizontal axis of the display panel while being inclined at the angle.

[0020] According to one embodiment of the present invention, the display panel has sub-pixels of the same color arranged side by side along the vertical axis of the display panel and sub-pixels of different colors arranged alternately along the horizontal axis of the display panel.

[0021] According to one embodiment of the present invention, a stereoscopic display device without glasses is designed so that a focal line formed by a user does not simultaneously pass through sub-pixels arranged adjacently along a vertical axis of the display panel.

[0022] According to one embodiment of the present invention, when the display device provides a multi-view stereoscopic image including a first viewpoint and a second viewpoint, first and second focal lines are formed corresponding to each viewpoint, and the processor controls the display panel so that all sub-pixels through which the first focal line passes reproduce an image or a part of the image for the first viewpoint.

[0023] According to one embodiment of the present invention, a stereoscopic display device without glasses is configured such that a sub-pixel positioned closer to the first focal line than to the second focal line reproduces an image or a part of the image for the first point in time even if no focal line passes through it.

[0024] According to one embodiment of the present invention, a stereoscopic display device without glasses is implemented such that the combination of sub-pixels that are enlarged and displayed for each convex lens is different by a preset number as the position of the focal line changes due to the movement of the user.

[0025] According to one embodiment of the present invention, the number of combinations is at least 20.

[0026] According to one embodiment of the present invention, a stereoscopic display device without glasses is designed so that a value obtained by multiplying the width of the convex lens by any natural number less than or equal to the number of combinations and a value obtained by multiplying the size of the subpixel by any natural number are not equal.

[0027] According to one embodiment of the present invention, in a stereoscopic display device without glasses, regardless of where a focal line is formed by a user, the distance between the center of each of the sub-pixels arranged to meet or be adjacent to the formed focal line and the formed focal line is different by the number of combinations.

[0028] According to one embodiment of the present invention, a stereoscopic display device without glasses further includes a camera module that tracks a user's viewpoint; wherein, when a movement of the viewpoint is detected by the camera module, the processor adjusts an image reproduced by each subpixel whenever the position of a focal line corresponding to the viewpoint changes by a distance between the centers of each adjacent subpixel along a horizontal axis divided by the number of combinations.

[0029] One embodiment of the present invention provides a stereoscopic display device with improved performance using a simple design that changes the inclination of pixels without changing an existing system related to image reproduction.

[0030] One embodiment of the present invention provides a glasses-free stereoscopic image display device that minimizes the occurrence of crosstalk and moire and realizes excellent three-dimensionality.

[0031] One embodiment of the present invention provides a stereoscopic display device that maintains high resolution by designing the same color pixels adjacent above and below not to be focused simultaneously.

[0032] One embodiment of the present invention provides a glasses-free stereoscopic image display device that minimizes eye fatigue by maintaining constant brightness regardless of viewing position.

[0033] One embodiment of the present invention provides a glasses-free stereoscopic image display device that allows natural image transitions rather than a phenomenon of interrupted images when a viewer watches while moving.

[0034] One embodiment of the present invention provides a glasses-free stereoscopic image display device that provides a stereoscopic image by identifying the user's position through viewpoint tracking, and reacts quickly even when the viewing position is slightly changed to always implement the same image and stereoscopic effect.

[0035] FIG. 1 is a drawing for explaining a conventional autostereoscopic stereoscopic display device with a lenticular lens attached vertically.

[0036] Figure 2 is a drawing for explaining a conventional autostereoscopic stereoscopic display device in which a lenticular lens is attached at an angle.

[0037] FIG. 3 is a block diagram schematically showing the structure of a glasses-free stereoscopic image display device according to one embodiment of the present invention.

[0038] FIG. 4 is a conceptual diagram for explaining the shape and structure of a pixel according to one embodiment of the present invention.

[0039] FIG. 5 is an exemplary diagram showing the front of a glasses-free stereoscopic image display device according to one embodiment of the present invention.

[0040] FIG. 6 is a conceptual diagram illustrating the effect of pixels being tilted and arranged according to one embodiment of the present invention.

[0041] FIG. 7 is a conceptual diagram for explaining the vertical axis direction arrangement of sub-pixels according to one embodiment of the present invention.

[0042] Figure 8 is an example of a conventional stereoscopic image display device having an inclined opening.

[0043] FIG. 9 is a conceptual diagram for explaining the period in which the boundary line of a lenticular lens and the side of a subpixel overlap according to one embodiment of the present invention.

[0044] Figure 10 is a conceptual diagram illustrating one embodiment of the present invention designed to solve conventional problems.

[0045] FIG. 11 is an exemplary diagram illustrating an improved effect compared to the prior art according to one embodiment of the present invention.

[0046] Below, with reference to the attached drawings, embodiments of the present invention are described in detail so that those skilled in the art can easily implement them. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, irrelevant parts have been omitted for clarity of description, and similar reference numerals have been used throughout the specification to indicate similar elements.

[0047] Throughout the specification, when a part is said to be "connected" to another part, this includes not only the cases where the parts are "directly connected" but also the cases where the parts are "electrically connected" with other elements intervening. Furthermore, when a part is said to "include" a component, this does not exclude other components, but rather includes other components, unless otherwise stated.

[0048] Hereinafter, an embodiment of the present invention will be described in detail using the attached drawings.

[0049] FIG. 3 is a block diagram showing a schematic structure of a glasses-free stereoscopic image display device according to one embodiment of the present invention.

[0050] A stereoscopic image display device (1) according to one embodiment of the present invention is a device designed to provide a stereoscopic image to a user. Any device including pixels (pixels) in which a stereoscopic image is reproduced is sufficient, and the form in which it is implemented is not limited to the present invention.

[0051] Referring to FIG. 3, the glasses-free stereoscopic image display device (1) may include a display panel (100), a lenticular lens (100), and a processor (300).

[0052] A display panel (100) according to one embodiment may be manufactured in a conventional rectangular shape. That is, the display panel (100) may be a two-dimensional flat panel having a vertical axis and a horizontal axis.

[0053] A display panel (100) according to one embodiment includes a plurality of pixels arranged in a checkerboard pattern. In addition to the pixels, the display panel (100) may further include various components for displaying a three-dimensional image. However, as these components are not directly related to the present invention, a detailed description thereof will be omitted.

[0054] According to one embodiment, the pixel may have various shapes depending on the display panel (100) product, but it is preferable to design it as a rectangle corresponding to the shape of the lenticular lens (200) in which semi-cylindrical convex lenses are arranged horizontally.

[0055] According to one embodiment, the pixel (110) may be composed of three sub-pixels (111, 112, 113) having three different colors. For example, referring to FIG. 4, the pixel (110) may be implemented as an RGB vertical, in which a sub-pixel (111) of a red (R) color filter, a sub-pixel (112) of a green (G) color filter, and a sub-pixel (113) of a blue (B) color filter are arranged in parallel. Accordingly, each sub-pixel (111, 112, 113) may be manufactured as a rectangle in which the vertical length is longer than the horizontal length. For example, the pixel (110) may be composed of sub-pixels (111, 112, 113) in which the vertical length is approximately three times the horizontal length.

[0056] Meanwhile, as previously known, the width of a pixel (110) is defined as a pixel size (PS) as shown in FIG. 4. In the present invention, it is assumed that the horizontal and vertical lengths of the pixel (110) are the same, but this assumption does not limit the present invention. In addition, as is known, a subpixel refers to an area occupied by a color filter within a pixel, and the horizontal length of the color filter is defined as a subpixel width (spw), and the horizontal axis length of a subpixel including a black matrix (BM) is defined as a subpixel size (sps). In addition, although an RGB series color filter is given as an example in FIG. 4, it should be interpreted that color filters of other series, such as BGR, are also included in the scope of the present invention.

[0057] According to one embodiment, a lenticular lens (200) may be arranged at a preset distance from the front of the display panel (100), and may preferably be designed to have an area that covers the entire area of ​​the panel (100). Here, the distance from the panel (100) may be a fixed value calculated by reflecting the refractive index of the lens in the physical distance from the lenticular lens (200) to the panel (100).

[0058] Referring to FIG. 5, the lenticular lens (200) includes a plurality of convex lenses (210) arranged in parallel. That is, the lenticular lens (200) may be composed of a plurality of convex lenses (210) that are continuously arranged on the front surface of the panel (100) along the horizontal axis of the panel (100). Meanwhile, the convex lens (210) is preferably a semi-cylindrical shape, but it should be understood that even a cylindrical convex lens is included in the scope of the present invention.

[0059] As illustrated in FIG. 5, each convex lens (210) is positioned so as to be tilted in a predetermined direction with respect to the vertical axis of the display panel (100). That is, the lenticular lens (200) may be attached to the front surface of the panel (100) so as to be tilted clockwise or counterclockwise rather than vertically, and the degree to which the lenticular lens (200), i.e., each convex lens (210), is tilted may be defined as a slanted angle (SA).

[0060] The user views a stereoscopic image through a lenticular lens (200), and the image of the subpixel located at the user's focus is enlarged and provided to the user. At this time, the user's focus is formed in the form of a line according to the direction and angle at which the convex lens is tilted. In other words, the set of focal points for the user to view the stereoscopic image can be defined as a focal line (FL) formed parallel to the convex lens.

[0061] Specifically, the display panel (100) can display a multi-view stereoscopic image including a first viewpoint and a second viewpoint, and a first focus line and a second focus line can be formed parallel to the convex lens (210) corresponding to each viewpoint. Here, when a user views a stereoscopic image, the first focus line and the second focus line can also be defined as a right-eye focus line and a left-eye focus line, respectively, based on binocular parallax, and these can be formed side by side with a preset interval.

[0062] According to one embodiment, the pixel (110) is formed in a state of being inclined so as to be parallel to the focal line (FL). That is, the pixel (110) can be arranged on the panel (100) at an angle and in a direction in which the convex lens (210) is inclined. Accordingly, as illustrated in FIG. 5, each sub-pixel (111, 112, 113) constituting the pixel (110) is also arranged parallel to the focal line (FL). Meanwhile, the display device (1) can be manufactured by varying the inclined angle (SA) of the convex lens (210) and the pixel (110), but it is preferable that the inclined angle be designed to be 5 to 15 degrees.

[0063] FIG. 6 is a conceptual diagram illustrating the effect of tilted pixels according to an embodiment of the present invention. Referring to FIG. 6, the area where a focal line can pass through a sub-pixel can be expressed as an influence range. The wider this influence range is, the higher the likelihood that focal lines from different viewpoints will simultaneously pass through the same sub-pixel. In other words, an area, like the box (b) area of ​​FIG. 2(a), where focal lines simultaneously pass through horizontally adjacent sub-pixels of different colors is formed on the panel (100). Accordingly, crosstalk occurs, which can cause unintended images and a deterioration in the quality of a stereoscopic image provided in an enlarged manner. In this regard, in the present invention, where the sub-pixels of FIG. 6(b) are arranged parallel to the focal line, compared to the prior art in which the sub-pixels of FIG. 6(a) are arranged vertically, the range in which the sub-pixels influence the focal line is narrowed. Therefore, crosstalk, which causes interference between different images, is minimized, so that a higher quality stereoscopic image can be provided to the user.

[0064] According to one embodiment, as illustrated in FIG. 5, the display panel (100) may be designed so that sub-pixels of the same color are arranged side by side along the vertical axis and sub-pixels of different colors are arranged alternately along the horizontal axis. This is a commonly designed arrangement pattern in the technical field of the present invention, but as described above, the sub-pixels (111, 112, 113) are arranged so as to be inclined in the direction and at an angle in which the convex lens (210) is inclined so as to be parallel to the focal line (FL). That is, the autostereoscopic stereoscopic display device (1) of the present invention can solve the problem of reducing crosstalk with only a simple design that changes the inclination of the pixel (110) without changing any other system.

[0065] According to one embodiment, the width of the convex lens (210) may be designed to be larger than the horizontal width (PS) of the panel (210). This is designed so that different focal lines formed by being refracted in different directions by one convex lens (210) are affected by different sub-pixels. Here, the display device (1) may be manufactured by varying the magnification of the length between the convex lens and the panel, but it is preferable that the width of the convex lens be designed to be 1.5 to 2 times the panel size (PS).

[0066] Referring again to FIG. 3, a processor (300) according to one embodiment serves to control a display panel (100) to provide a stereoscopic image to a user. According to one embodiment, at least two images forming a stereoscopic image are pre-input and stored in the display device (1), and under the control of the processor (300), each sub-pixel configured in the panel (100) is designed to selectively reproduce one or two of the stored images depending on the user's viewpoint.

[0067] As described above, when the display device (1) provides a multi-view stereoscopic image including the first viewpoint and the second viewpoint of the user, a first focal line and a second focal line are formed on the panel (100) corresponding to each viewpoint. At this time, according to one embodiment, the processor (300) controls the display panel (100) so that all sub-pixels through which the first focal line passes reproduce an image for the first viewpoint or a part thereof. Similarly, the processor (300) controls the display panel (100) so that all sub-pixels through which the second focal line passes reproduce an image for the second viewpoint or a part thereof. That is, a set of identical images for each viewpoint is enlarged by the lenticular lens (200) and shown to the user through the sub-pixels through which each focal line passes. Accordingly, when the user watches the stereoscopic image, different images are simultaneously and separately viewed through the first viewpoint (right eye) and the second viewpoint (left eye), thereby experiencing an excellent three-dimensional effect.

[0068] According to one embodiment, the processor (300) can set the image reproduced by sub-pixels located adjacent to the focal line as the image of the focal line even if the focal line formed by the user does not directly pass through it. In the case of multiple viewpoints, the processor (300) can determine the distance between focal lines for each sub-pixel and control the panel (100) to reproduce the image or a part thereof of the viewpoint corresponding to the closest focal line. For example, if a sub-pixel is located closer to the first focal line than to the second focal line even if a single focal line does not directly pass through it, the processor (300) can set the image reproduced by the corresponding sub-pixels as the image for the first viewpoint or a part thereof. Accordingly, the phenomenon of different images overlapping by sub-pixels adjacent to the focal line is prevented, and even subtle movements of the user can be handled. A more detailed description related to this will be described later with reference to FIG. 10.

[0069] Meanwhile, referring to Fig. 7(a), depending on the user's position, there is a possibility that a focal line (FL) may be formed that simultaneously passes through adjacent sub-pixels above and below. As shown in Fig. 7(a), when sub-pixels of the same color are arranged vertically, the focal line (FL) simultaneously passes through adjacent sub-pixels of the same color. Therefore, since the corresponding area is viewed with the same color being magnified above and below by the lenticular lens (200), a problem may arise in that the resolution of the stereoscopic image is reduced at that point in time.

[0070] To address this situation, a display device (1) according to one embodiment may be designed so that a focal line (FL) formed by a user does not simultaneously pass through sub-pixels arranged adjacently along the vertical axis of the display panel (100). Referring to Fig. 7(b), the design of the present embodiment may be based on the relationship between the lenticular lens (200) and the angle (θ) at which the sub-pixel is tilted and the width (spw) of the sub-pixel. More specifically, the display device (1) may be designed to satisfy the following equation 1.

[0071] [Formula 1]

[0072]

[0073] Meanwhile, recently, stereoscopic display devices have begun to appear, featuring a color filter area exposed to the outside at a certain angle. While this prior art presents solutions that are somewhat similar to those of the present invention, it also presents several problems, which will be described using Figure 8. Figure 8 is an example of a conventional stereoscopic display device with an inclined aperture.

[0074] Referring to Fig. 8, a conventional stereoscopic display device has pixels arranged in a general pattern. That is, the pixels themselves are arranged vertically as in the past, but a black matrix (92) is manufactured so that a parallelogram-shaped opening (91) is formed. Accordingly, as shown in Fig. 8, a sub-pixel having a side at an angle parallel to a lens is implemented as the color filter is exposed through the opening (91). That is, in a conventional stereoscopic display device, measures such as enlarging the opening or changing the black matrix area must be taken to incline the sub-pixel.

[0075] In addition, conventional stereoscopic image display devices have a problem in that the brightness of the screen changes rapidly depending on changes in the user's position. For example, in the case of the first focal line (FL1), only the image of the sub-pixels corresponding to the first viewpoint (V1) is magnified by the lens and appears, and in the case of the third focal line (FL3), only the image of the sub-pixels corresponding to the second viewpoint (V2) is magnified and appears. That is, at the user's position where the first focal line (FL1) and the third focal line (FL3) are formed, a stereoscopic image of almost the same brightness is provided. However, in the case of the second focal line (FL2), since it passes through the sub-pixels of both the first viewpoint (V1) and the second viewpoint (V2), the brightness at that position increases by twice compared to the first focal line (FL1) and the third focal line (FL3). Therefore, when the user's viewpoint moves from viewpoint 1 (V1) to viewpoint 2 (V2), the brightness of the stereoscopic image doubles momentarily, which can cause extreme fatigue.

[0076] In addition, conventional stereoscopic display devices have the problem of generating a significant level of crosstalk. For example, since the second focal line (FL2) passes through both the sub-pixels of viewpoint 1 (V1) and viewpoint 2 (V2), a user at that location sees an image that is half-mixed with the images of viewpoint 1 (V1) and half-mixed with the images of viewpoint 2 (V2).

[0077] Meanwhile, in the field of autostereoscopic stereoscopic images with viewpoint tracking, there is a challenge to ensure natural transitions in the image being viewed even when the user moves slightly. However, conventional stereoscopic image display devices have limitations in compensating the reproduced image, which causes a short-circuiting phenomenon instead of a smooth transition. This is because conventional stereoscopic image display devices have a limitation in that the user's focus line passes through the same location of all subpixels. For example, in Fig. 8, the first focus line (FL1) and the third focus line (FL3) pass through the centers of all subpixels corresponding to viewpoint 1 (V1) and viewpoint 2 (V2), respectively. Therefore, it is impossible to compensate for or change the stereoscopic image when the user moves from one end of the subpixel to the other by the width, and only when the user simultaneously passes through subpixels of different viewpoints can the image reproduced by each subpixel be changed. That is, referring to Fig. 8, since control to convert the image of viewpoint 2 into the image of viewpoint 1 is possible only when the user's viewpoint crosses the second focus line (FL2), a short-cut image transition is inevitable.

[0078] In conclusion, conventional stereoscopic image display devices require changes to the design of the aperture and black matrix, which limits panel manufacturing. Furthermore, as shown in Fig. 8, when the viewpoint changes from viewpoint 1 (V1) to viewpoint 7 (V7) as the user moves, a total of six instantaneous brightness increases and a phenomenon in which different images overlap at a very high level occurs. Furthermore, since it is impossible to respond to the user's subtle movements, there is a limitation in providing short-term image transitions. Consequently, a low-quality stereoscopic image service that causes viewing discomfort and eye fatigue is unavoidable.

[0079] The present invention discloses an embodiment that aims to solve the problems of the conventional stereoscopic image display device described above, and the contents thereof will be described with reference to FIGS. 9 and 11.

[0080] First, the display device (1) of the present invention is designed to borrow the existing rectangular pixel shape as is, but with the arrangement direction tilted parallel to the lens. Therefore, the display device (1) does not require limited use of the aperture or black matrix area, and does not require any special modifications to the existing system, thereby reducing manufacturing difficulty and enabling various panel designs.

[0081] According to one embodiment, a display device (1) may be designed such that, as the position of the focal line changes due to the movement of the user, a combination of sub-pixels that are enlarged and displayed by each convex lens is implemented differently by a preset number. In this case, the number of combinations may vary depending on the display product, but it is preferable that it be implemented at least 20 or more.

[0082] For example, referring to FIG. 9, the display device (1) can be designed so that the number of times that the boundary line of the lenticular lens (200) formed by adjacent convex lenses (210) overlaps with one side of the pixel (110) or sub-pixel (111) is the number of combinations of sub-pixels. That is, it is preferable that the display device (1) be designed so that the boundary line of the lenticular lens (200) and the side of the sub-pixel (111) do not overlap within a section in which at least 20 convex lenses (210) are continuously arranged. This means that the value obtained by multiplying the width (pitch) of the convex lens (210) by a natural number less than or equal to the number of combinations (for example, any natural number less than or equal to 20) and the value obtained by multiplying the size (sps) of the sub-pixel by an arbitrary natural number are not equal, and can be expressed by the following Equation 2.

[0083] [Formula 2]

[0084]

[0085] According to this embodiment, regardless of where the focal line is formed by the user, the distance between the center of each of the sub-pixels that meet or are positioned adjacent to the formed focal line and the focal line is implemented differently by the number of combinations.

[0086] For example, as shown in Fig. 10, the right-eye focal line (RFL) incident on the user's right eye passes through the center of the red sub-pixel in layer N1. If the number of combinations is assumed to be 20, the right-eye focal line (RFL) does not pass through the center of any sub-pixel until layer N20, and passes through the center of a sub-pixel only in layer N21. In other words, the display device (1) can be designed so that the number of cycles in which the focal line passes through the center of the sub-pixel is the number of combinations.

[0087] Accordingly, the distance between the centers of the sub-pixels included in one cycle and the focal lines passing through them becomes different by the number of combinations. Referring to Fig. 10, in the above example, the distance between the centers of the sub-pixels that meet or are adjacent to the right-eye focal line (RFL) and the right-eye focal line (RFL) is different for each sub-pixel in layers N1 to N20. That is, when the right-eye focal line (RFL) passes through the centers of the sub-pixels in layers N1 and N21, d2 to d20 have different values.

[0088] If the distance between the centers of adjacent subpixels on the horizontal axis is assumed to be "1", each time the position of the focal line changes by a distance of "1 / 20" due to the user's movement, the focal line passes through the center of the subpixel of the other layer. Therefore, even if the position of the focal line changes due to the user's movement, the difference in brightness is at most "the distance between the centers of adjacent subpixels on the horizontal axis / the number of combinations", so the user can watch a stereoscopic image with consistent brightness, minimizing eye fatigue.

[0089] According to the present embodiment, when providing a stereoscopic image, the processor (300) can calculate the distance between the center of the sub-pixels where each focal line meets or is adjacent to each other, for each right-eye focal line (RFL) and left-eye focal line (LFL). As described above, under the control of the processor (300), each sub-pixel reproduces an image of a viewpoint corresponding to the focal line formed at the closest distance. For example, as shown in FIG. 10, in the case of a green sub-pixel located between the right-eye focal line (RFL) and the left-eye focal line (LFL) of the N2 layer, since its center is calculated to be closer to the right-eye focal line (RFL), the corresponding sub-pixel is set by the processor (300) to reproduce an image of image 1. In the same manner, the reproduction images of all sub-pixels are set according to the user's viewpoint. Therefore, the occurrence of crosstalk is suppressed, overlapping images are minimized, and a high-quality stereoscopic image can be provided to the user.

[0090] According to the present embodiment, the display device (1) may further include a camera module that tracks the user's viewpoint. When the movement of the viewpoint is detected by the camera module, the processor (300) can adjust the image reproduced by each sub-pixel whenever the position of the focal line corresponding to the viewpoint changes by a distance equal to the distance between the centers of adjacent sub-pixels in the horizontal axis divided by the number of combinations. As assumed above, when the number of combinations is 20 and the distance between the centers of adjacent sub-pixels is 1, whenever the position of each focal line (RFL, LFL) changes by 1 / 20, the near focal line of one or more sub-pixels changes. For example, in FIG. 10, it is assumed that the center of the sub-pixel of the N10 layer is close to the right focal line (RFL) and is reproducing the image of image number 1. When a movement of the viewpoint due to a slight movement of the user during viewing is detected, and each focus line (RFL, LFL) changes to the right by 1 / 20 according to the movement of the viewpoint, if the center of the sub-pixel of the N10 layer becomes closer to the left focus line (LFL), the processor (300) immediately adjusts the corresponding sub-pixel to reproduce the image of the second video.

[0091] That is, the display device (1) of the present embodiment can provide a smooth transition of a stereoscopic image in response to the user's subtle movements by adjusting the image to be played back for each subpixel in units of "the distance between the centers of adjacent subpixels on the horizontal axis / the number of combinations." An example of this is illustrated in Fig. 11. Fig. 11(a) shows a transition of a screen according to the display device of the present embodiment, and Fig. 11(b) shows a transition of a screen according to a conventional display device.

[0092] When explaining with Fig. 10, assuming that image 1 is a white image and image 2 is a black image, Fig. 11(a) shows a state in which a stereoscopic image is displayed with a subtle transition whenever the focus line (RFL, LFL) changes by "the distance between the centers of adjacent sub-pixels on the horizontal axis / the number of combinations (e.g., 1 / 20)". On the other hand, Fig. 11(b) shows a state in which the same stereoscopic image is provided without responding to the user's subtle movements, and although not shown, the positions of the white image and the black image are swapped left and right the moment the focus line enters another horizontally adjacent sub-pixel, which results in a short-term transition.

[0093] Although the methods and systems of the present invention have been described with respect to specific embodiments, some or all of their components or operations may be implemented using a computer system having a general-purpose hardware architecture.

[0094] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will readily appreciate that the present invention can be readily modified into other specific forms without altering the technical spirit or essential characteristics of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single entity may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined manner.

[0095] The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

Claims

1. In a stereoscopic display device without glasses, A display panel in which a plurality of rectangular pixels are arranged in a tile pattern; A lenticular lens, which is composed of a plurality of convex lenses inclined at a preset angle in a preset direction with respect to the vertical axis of the display panel, and is arranged on the front of the display panel; and A processor controlling the display panel; including: The above plurality of pixels are arranged so as to be inclined parallel to a focal line formed according to the direction and angle at which the convex lens is inclined, A stereoscopic image display device without glasses, wherein the focal line is formed parallel to the convex lens and is a set of focal points for a user to view a stereoscopic image.

2. In paragraph 1, A stereoscopic display device without glasses, wherein the width of the convex lens is designed to be larger than the width of the pixel.

3. In paragraph 1, A stereoscopic display device without glasses, wherein the angle at which the convex lens and the pixel are tilted is 5 to 15 degrees clockwise or counterclockwise.

4. In paragraph 1, A stereoscopic display device without glasses, wherein each of the plurality of pixels is composed of three sub-pixels having three different colors, and the sub-pixels constituting one pixel are arranged side by side along the horizontal axis of the display panel while being tilted at the angle.

5. In paragraph 4, The display panel is a stereoscopic display device without glasses, in which sub-pixels of the same color are arranged side by side along the vertical axis of the display panel and sub-pixels of different colors are arranged alternately along the horizontal axis of the display panel.

6. In paragraph 4, A stereoscopic display device without glasses, wherein a focal line formed by a user is designed so that it does not simultaneously pass through sub-pixels arranged adjacently along the vertical axis of the display panel.

7. In paragraph 4, When the above display device provides a multi-view stereoscopic image including a first viewpoint and a second viewpoint, the first and second focal lines are formed correspondingly for each viewpoint, A stereoscopic display device without glasses, wherein the processor controls the display panel so that all sub-pixels through which the first focal line passes reproduce an image or a part of the image for the first point in time.

8. In paragraph 7, A stereoscopic display device without glasses, wherein a sub-pixel positioned closer to the first focal line than to the second focal line is set to reproduce an image or a part of the image for the first viewpoint even if neither focal line passes through it.

9. In paragraph 4, A stereoscopic image display device without glasses, in which the combination of sub-pixels that are enlarged and displayed by each convex lens is implemented differently by a preset number as the position of the focal line changes due to the movement of the user.

10. In paragraph 9, A stereoscopic display device without glasses, wherein the number of the above combinations is at least 20.

11. In paragraph 9, A stereoscopic display device without glasses, designed so that the product of the width of the convex lens and any natural number less than or equal to the number of combinations is not equal to the product of the size of the subpixel and any natural number.

12. In paragraph 9, A stereoscopic display device without glasses, in which the distance between the center of each sub-pixel that meets or is positioned adjacent to the formed focus line and the formed focus line is different by the number of combinations, regardless of the position at which the focus line is formed by the user.

13. In paragraph 9, A camera module for tracking the user's viewpoint; further comprising: When movement of the viewpoint is detected by the above camera module, The above processor is a stereoscopic display device that adjusts the image reproduced by each subpixel whenever the position of the focal line corresponding to the viewpoint changes by a distance between the centers of adjacent subpixels along the horizontal axis divided by the number of combinations.

Images