Method for orienting content on a glasses-free stereoscopic display device

Abstract

The present invention relates to a method for orienting stereoscopic content on a glasses-free stereoscopic display device displayed to one or more viewers. In the method of the present invention, at a specific point in time during the display of the stereoscopic content, the glasses-free stereoscopic display device receives a command to correct the display orientation of the content on the screen by a specific amount of rotation. Subsequently, if a standard content rotation is performed on the glasses-free stereoscopic display device in a manner similar to content rotation on a planar display device, the viewer will no longer experience the correct three-dimensional content. The present invention solves this problem by taking rotation into account at the stage of weaving the stereoscopic content for the glasses-free stereoscopic display screen. An additional problem may arise when there is rotation of the viewer relative to the glasses-free stereoscopic display device to the extent that the viewer experiences inverted depth. The present invention provides a solution to this by swapping stereoscopic pair images.

Description

Technical Field

[0001] The present invention relates to a method of orienting content on a stereoscopic display device without glasses, and to a computer-readable medium and software for performing such a method. The present invention further relates to a stereoscopic display device without glasses.

Background Art

[0002] Stereoscopic displays without glasses are playing an increasingly important role in virtual reality and augmented reality applications. One of their most prominent features is the ability to enable a viewer to perceive three-dimensional content without the use of a dedicated glasses device, even when the viewer moves relative to the display.

[0003] The key to this technology lies in the presence of a screen that includes a lenticular lens or a parallax barrier placed in front of an array of pixels. The lenticular lens or parallax barrier can direct the light emitted by the pixels in specific spatial directions, thereby enabling selective illumination of only one of the pair of eyes. In some cases, by using eye position data acquired in real time and precisely controlling the pixels individually, the screen can simultaneously direct the left-eye content to the viewer's left eye and the right-eye content to the viewer's right eye. The resulting stereoscopic content provides depth perception to the viewer, and elements within the content can appear in front of or behind the display.

[0004] For each given viewer position relative to the screen, there are alternating columns or bands of pixels that illuminate either the right or the left eye. Therefore, the left-eye content and the right-eye content need to be split into columns that are assigned to alternating pixel columns. The process leading to this kind of interlacing is called weaving. A device that performs weaving is called a weaver.

[0005] During use of a typical display (flat view or autostereoscopic), the displayed content may rotate on the screen. For example, this can happen when the viewer commands the autostereoscopic display to do so, for instance, when the viewer desires to view the content in a rotated form. In another example, the autostereoscopic display may automatically rotate the displayed content when the viewer rotates around the optical axis of the screen itself. Such automatic content rotation is made possible by a feature commonly known as "auto-rotation." This feature is particularly common in mobile devices, which often rotate relative to the user or viewer during use. Such rotation is compensated for by reversing the rotation of the screen content, so that the viewer does not effectively experience content rotation.

[0006] Rotating content on flat-screen devices such as typical mobile phones and television screens is very easy because the same new command can be easily given to all pixels based on the original content to be displayed. However, this is not the case with autostereoscopic displays, which work with lenticular lenses, parallax barriers, or other means for forming multiple views where the light output of each pixel is modified so that it can only be seen from one or more specific directions or angles. In such autostereoscopic displays, when standard content rotation is performed, the viewer will no longer experience the correct three-dimensional content.

[0007] Another problem associated with the rotation of glasses-free stereoscopic displays is that viewers may perceive inverted depth. [Overview of the project]

[0008] Therefore, an object of the present invention is to provide a method for correctly displaying content (e.g., stereoscopic images or stereoscopic videos) on a glasses-free stereoscopic display device when the content is to be rotated on the device's screen. In particular, an object of the present invention is to provide a method for (automatic) rotation of content displayed on the screen of a glasses-free stereoscopic display. Another object of the present invention is to ensure that the correctly displayed depth is maintained when the glasses-free stereoscopic display rotates around its optical axis in front of the viewer using the method of the present invention.

[0009] Another objective is to provide a glasses-free stereoscopic display device that can rotate the displayed content. In particular, the objective is for such a device not to be troubled by displaying stereoscopic content with inverted depth.

[0010] It has been found that one or more of these objectives can be achieved by performing a method of aligning the content on a glasses-free stereoscopic display device to display the first and second content to one or more viewers, and this method is - A naked-eye stereoscopic display device, A glasses-free stereoscopic display screen comprising: an array of display pixel elements for generating display output; and a view-forming configuration provided on the array, which can direct the display outputs from different display pixel elements to different spatial positions within the field of view of the glasses-free stereoscopic display device in order to enable the display of first content and second content. The steps of providing a glasses-free stereoscopic display device comprising: a weaver configured to receive content data representing first content and second content, and to weave the first content and second content for a glasses-free stereoscopic display screen; - A step of simultaneously displaying the first content and the second content to one or more viewers of a glasses-free stereoscopic display device, wherein the displayed first and second content have an initial display orientation on the glasses-free stereoscopic display screen, and the step of displaying the first content and the second content is, o The Weaver receives content data representing the first content and the second content, and then o Weaving first content and second content for a glasses-free stereoscopic display screen by determining for each display pixel element in the array whether to provide a display output for first content or a display output for second content, wherein the array has an initial array orientation as seen from the Weaver's viewpoint, and then The display step includes controlling the display pixel elements to display the first content and the second content on a naked-eye stereoscopic display screen in their initial display orientation, - At a specific point in time while the first and second contents are being displayed, the naked-eye stereoscopic display device receives a command to correct the display orientation of the first and second contents on the naked-eye stereoscopic display screen by a known amount of rotation relative to the initial display orientation, thereby, after the execution of the command, the displayed first and second contents have the corrected display orientation on the naked-eye stereoscopic display screen. After receiving the command, - Weaving for a glasses-free stereoscopic display screen is performed in a modified array orientation, where, from the Weaver's perspective, the modified array orientation is related to the initial array orientation by a rotation amount equal to a known rotation amount according to the received command. - The received command is executed to correct the display orientation of the first and second content on the naked-eye stereoscopic display screen by a known amount of rotation.

[0011] The present invention further relates to a glasses-free stereoscopic display device configured to display first content and second content to one or more viewers, wherein the glasses-free stereoscopic display device is -A glasses-free stereoscopic display screen comprising an array of display pixel elements for generating a display output, and a view forming configuration provided on the array, which can direct the display output from different display pixel elements to different spatial positions within the field of view of the glasses-free stereoscopic display device in order to enable the display of first content and second content. - A weaver configured to receive content data representing the first content and the second content, and to weave the first content and the second content for a glasses-free stereoscopic display screen, - The system comprises a processor and memory, the memory comprising computer executable code that, when executed by the processor, causes the processor to perform a method for oriented content onto the above-described autostereoscopic display device.

[0012] The present invention further relates to a computer-readable medium containing temporary or non-temporary data representing instructions causing a processor system to perform a method for oriented content onto a glasses-free stereoscopic display device as described above.

[0013] The present invention further relates to software configured to perform a method for oriented content onto a glasses-free stereoscopic display device as described above, when executed on a computer. [Brief explanation of the drawing]

[0014] [Figure 1] A flowchart illustrating a conventional process for displaying first and second content on a glasses-free stereoscopic display device is shown. [Figure 2] A flowchart illustrating the process according to the present invention for displaying first and second content on a glasses-free stereoscopic display device is shown. [Figure 3]This displays two different display orientations of specific stereoscopic content on a mobile glasses-free stereoscopic display device. [Figure 4] Figure 3 shows a complete image of stereoscopic content partially displayed in two different display orientations. [Modes for carrying out the invention]

[0015] The drawings do not limit the present invention to the specific embodiments disclosed and described herein. The elements in the drawings are illustrative for simplification and clarity and are not necessarily drawn to scale, instead focusing on clearly illustrating the principles of the present invention.

[0016] Furthermore, terms such as “first,” “second,” etc., in this specification and the claims are generally used to distinguish similar elements, if any, and are not necessarily used to describe a sequential or chronological order.

[0017] In the context of this invention, the term “glasses-free stereoscopic display device” means a device capable of displaying at least a first content and a second content in different spatial positions. Both together may form a stereoscopic pair to enable a viewer to see the stereoscopic content. Alternatively, the glasses-free stereoscopic display device may display the first and second content to two different people, each enabling them to see the planar content. If the glasses-free stereoscopic display device can also display a third and fourth content, then two different people may each see the stereoscopic content.

[0018] In the context of the present invention, the term "viewer" means a person who consumes the content presented by a stereoscopic autostereoscopic display device, specifically, a person who can view it. Throughout the text, references to the viewer are made by male words such as "he", "him", or "his". This is for the sole purpose of clarity and brevity, and it is understood that female words such as "she" and "her" apply equally. The same also applies to references in the text to the term "user".

[0019] In the context of the present invention, the term "content" means any other content including video, photographs, still images, videos, graphical user interfaces, graphical objects, animations, television broadcasts, live feeds, or content broadcast via the Internet or other networks or stored on a storage medium for playback.

[0020] In the context of the present invention, the term "optical axis" of a stereoscopic autostereoscopic display device or its screen means a straight line perpendicular to the screen and passing through the geometric center of the screen.

[0021] The method according to the present invention is executed on a naked-eye stereoscopic display device, and the weaver of the naked-eye stereoscopic display device uses the first content data and the second content data to enable the naked-eye stereoscopic display screen to display these data as the first content and the second content. The naked-eye stereoscopic display screen includes an array of display pixel elements for generating a display output, and a view-forming configuration associated with the array, particularly provided on top of the array. The view-forming configuration typically includes a lenticular lens or a parallax barrier. The lenticular elements of the lenticular lens and the elongated slits of the parallax barrier can direct the display outputs from different display pixel elements within the array to different spatial positions within the viewing field of the naked-eye stereoscopic display device. In this way, it is possible to display the first content (e.g., the first image) at the first viewing position and the second content (e.g., the second image) at the second viewing position.

[0022] In addition, there may be other types of view-forming configurations that can direct the display outputs from different display pixel elements within the array to different spatial positions within the viewing field of the naked-eye stereoscopic display device. An alternative display technology for the view-forming configuration is, for example, a technology known as "directed backlight".

[0023] When the content is displayed on a naked-eye stereoscopic display screen having a view-forming configuration, there are alternating bands or columns of display pixel elements that illuminate either the first viewing position or the second viewing position. Therefore, each content (e.g., each image) that is to be viewed needs to be divided into bands or columns assigned to alternating pixel columns. The process of arriving at this kind of content interlace involves a large number of calculations and is called "weaving". This process is executed by a device called a "weaver". The result of the content weaving is called "woven content". After weaving, the display pixel elements are instructed to generate a display output according to the woven content.

[0024] The first and second contents displayed in the method of the present invention have a display orientation on the naked-eye stereoscopic display screen. This means that such contents have an orientation relative to the naked-eye stereoscopic display screen (for completeness, note that "display orientation" does not refer, for example, to the orientation of the naked-eye stereoscopic display screen itself). From the start of the method, the displayed contents are considered to have an initial display orientation until, at a certain point in time during the display of the first and second contents, the naked-eye stereoscopic display device receives a command to modify the initial display orientation of the first and second contents on the naked-eye stereoscopic display screen. This modification involves a certain rotation. This means that after the execution of the command, the displayed first and second contents have a modified display orientation on the naked-eye stereoscopic display screen that is different from the initial orientation. This may or may not occur simultaneously with a change in the orientation of the naked-eye stereoscopic display screen itself relative to the real world (this will be further detailed below).

[0025] However, achieving proper display of the first and second content with such modified orientations is not straightforward. Simply using Weaver output to control the display pixel elements on a rotated array of display pixel elements resulted in a significantly impaired display of the first and second content.

[0026] A flowchart illustrating this conventional process is shown in Figure 1. At a specific point in time while the first and second content are being displayed, a command to correct the display orientation is received. From that point onward, this correction is always performed on the woven content data, i.e., before pixel control and after weaving the first and second content data. However, this does not allow stereoscopic content to be displayed properly.

[0027] The inventors considered that the calibration parameters of an assembly of a view-forming configuration having an array of display pixel elements could not be directly used for other display orientations. Surprisingly, this problem can be solved by considering the orientation of the array of display pixel elements relative to the content being woven during the weaving of the first and second content. The naked-eye stereoscopic display device is programmed so that a received command to correct the initial display orientation triggers a virtual rotation of the array of display pixel elements before performing the weaving of the first and second content. For this purpose, the initial array orientation and the corrected array orientation are defined for the purpose of weaving. From the start of the method, the array is then considered to have an initial array orientation for the purpose of weaving (i.e., from the viewpoint of the weaver). This means that, in order to weave the first and second content before receiving a command to correct the display orientation, the weaver determines whether each display pixel element in the array having a particular initial array orientation provides a display output for the first content or a display output for the second content. When a rotation command is received, a virtual rotation is performed so that the array has a corrected array orientation from the viewpoint of the weaver. This means that the weaving of the first and second content is performed on the rotated array (i.e., when the array has a specific modified array orientation). Then, when the display pixel elements are controlled in response to the rotation command, the first and second content are displayed correctly with the rotation corrected.

[0028] The expression "from the Weaver's perspective" should be understood in a more abstract way, rather than as the actual physical setting in which the Weaver views the array. This is explained below. If the Weaver begins by determining whether each display pixel element provides a display output for a first content or a display output for a second content, the Weaver typically starts with the pixel in the upper-left corner of the array. This pixel is designated as the "starting pixel." After virtually rotating the array from its initial orientation to a modified array orientation, the pixel designated as the "starting pixel" before the virtual rotation is no longer in the upper-left corner "from the Weaver's perspective." The Weaver's programming instructs that a different pixel be designated as the "starting pixel," i.e., the pixel in the upper-left corner of the array from the Weaver's perspective.

[0029] A flowchart illustrating such a process according to the present invention is shown in Figure 2. At a specific point in time while the first and second contents are being displayed, a command to correct the display orientation is received. From that moment onward, weaving is always performed on the screen with the corrected orientation, and only afterward is the actual correction of the display orientation performed. This ensures that the rotated stereoscopic content is correctly displayed on the glasses-free stereoscopic display screen.

[0030] In principle, a known amount of rotation can be any amount of rotation between 0° and 360°. However, typically, the amount of rotation is selected from the groups of 90°, 180°, and 270°.

[0031] Typically, the naked-eye stereoscopic display device in the method of the present invention comprises an eye-tracking system for determining the position of one or more viewers' eyes relative to the naked-eye stereoscopic display device. Such an eye-tracking system typically comprises means for tracking the position of one or more viewers' eyes relative to the naked-eye stereoscopic display device and is operably connected to the naked-eye stereoscopic display device. In this way, left-eye content can be accurately presented to the viewer's left eye, right-eye content can be accurately presented to the viewer's right eye, and the viewer can see the stereoscopic content. Alternatively, a first viewer can be accurately presented with first planar (or stereoscopic) content, and a second viewer can be accurately presented with second planar (or stereoscopic) content, and each of both viewers can see their own planar (or stereoscopic) content.

[0032] Alternatively, or in addition to such an eye-tracking system, a naked-eye stereoscopic display device may include a head-tracking system for determining the position of each head or head feature of one or more viewers, where the head or head feature represents the average position of each eye of one or more viewers, e.g., a single position, where the eye positions of the viewers are averaged to obtain a single position. In this way, a first planar (or stereoscopic) content can be accurately presented to a first viewer, a second planar (or stereoscopic) content can be accurately presented to a second viewer, and each of both viewers can see different planar (or stereoscopic) content.

[0033] Commands to a stereoscopic display device are often given by the user of the stereoscopic display device via a user interface, such as keyboard shortcuts, a mouse, a graphical user interface, a gesture-recognition device, or a voice-recognition device. Typically, the user is a viewer of the stereoscopic display device.

[0034] However, the commands may be generated not by the user or viewer, but by a dedicated device or component of the autostereoscopic display device. This is the case, for example, when the autostereoscopic display device is equipped with a so-called "auto-rotation" feature, which is known in the art as a feature that allows the screen of the display device to rotate automatically depending on how the user or viewer holds the display device. For example, if a viewer rotates the phone sideways by rotating the phone around its optical axis, the screen automatically switches to landscape mode by performing a reverse rotation of the displayed content.

[0035] Such a display device is typically capable of measuring or determining its orientation relative to the ground, and is configured to, for example, command the rotation of the content displayed on the screen if it detects a discrepancy between the measured or determined orientation and the displayed orientation. Thus, in the method of the present invention, the command to the autopsis display device may be a command given by a component of the autopsis display device or by a further device associated with the autopsis display device, which is configured to use the measured or estimated orientation of the autopsis display device relative to the ground in order to decide whether to give the command.

[0036] For example, such a device is configured to compare the measured or estimated orientation of the naked-eye stereoscopic display device relative to the ground with a preset value for the orientation of the naked-eye stereoscopic display device relative to the ground, and to decide to give a command based on the comparison made.

[0037] The measured or estimated orientation of such devices is typically obtained by measuring instruments selected from the group consisting of gyroscopes, magnetometers, accelerometers, gravimeters, and inclinometers.

[0038] However, the decision to issue commands may be based on the orientation of the naked-eye stereoscopic display device relative to the viewer. This relates in particular to the orientation of the naked-eye stereoscopic display device relative to the viewer's eyes (such as that derived from the roll tilt of the viewer's head). Such a naked-eye stereoscopic display device usually includes a face tracker or eye tracker to constantly monitor the viewer's roll tilt relative to the naked-eye stereoscopic display device.

[0039] In the method of the present invention, the first content and the second content may be content viewed by different people, for example, the first content may be viewed by the first person and the second content by the second person. The two people may view different content when looking at the same naked-eye stereoscopic display device.

[0040] Alternatively, the first and second content may be viewed by a single viewer by orienting the first content to the first eye and the second content to the second eye. When the first and second content together form a stereoscopic pair of stereoscopic content, the user can view the stereoscopic content.

[0041] Furthermore, by directing a pair of stereoscopic content displays towards each viewer, it is possible to provide different stereoscopic content to two viewers. This requires the display of a third and a fourth content.

[0042] The lenticular lens elements within the lenticular lens and the elongated slits within the parallax barrier are elongated elements that orient the display pixel outputs in different directions perpendicular to their elongation direction (also known as the inclination direction). Therefore, stereoscopic viewing can only be achieved if there is a parallax shift (difference) or a component thereof in the direction of the viewer's virtual interpupillary line. When this situation intersects during rotation of the naked-eye stereoscopic display screen relative to the viewer, the left-eye content is oriented towards the right eye, and vice versa. This is experienced by the viewer as if the depth of the displayed content has been inverted (though not necessarily impaired in other embodiments). Therefore, simply rotating the naked-eye stereoscopic display screen around its optical axis in front of the viewer can invert the depth of the viewed stereoscopic content. This can be corrected by weaving the left-eye content to display pixel elements that orient their output towards the right eye, and vice versa. Therefore, in addition to correcting the display orientation of the content according to the method of the present invention, the inverted depth due to screen rotation can be corrected in specific embodiments of the present invention in which the stereoscopic content is viewed.

[0043] Therefore, the method of the present invention can check whether there is rotation of the naked-eye stereoscopic display screen relative to the viewer to such an extent that the left-eye content is directed towards the viewer's right eye and the right-eye content is directed towards the viewer's left eye, thereby causing the viewer to perceive depth inversion if not corrected. Such checks may be performed multiple times at regular intervals, for example, once per second or five times per second.

[0044] Furthermore, if a rotation is observed that causes a depth inversion in the viewer, the left-eye content and right-eye content may be swapped, with the left-eye content again facing the viewer's left eye and the right-eye content again facing the viewer's right eye.

[0045] In some cases, the autopsis stereoscopic display device in the method of the present invention is configured to modify the displayed content when it receives a command to modify the display orientation of the content on the screen. When such modification is made, this typically relates to a response to a change in display orientation from landscape mode to portrait mode, or vice versa. Changes in aspect ratio associated with such changes may result in undesirable changes to the proportion of the content, such as stretching in a particular direction. This can be mitigated by cropping the content or by shrinking the content (without changing its proportion) while adding a new area to the content. Another way to mitigate this is by adapting the layout of the content (e.g., rearranging text and / or figures within the content). Thus, in the method of the present invention, after receiving a command and before weaving for the autopsis stereoscopic display screen, the weaver may receive modified content data representing the modified first content and the modified second content.

[0046] Here, the modified first content and the modified second content may be modified in such a way that their aspect ratios correspond to the aspect ratios of the array of display pixel elements. The aspect ratio is, for example, - Action to remove one or more areas from the first content and the second content. - Actions to resize one or more areas of the first and second content, - Can be modified by one or more actions selected from the group of actions that add one or more areas to the first content and the second content.

[0047] However, if the displayed content is part of a virtual three-dimensional environment, or part of a "digital twin" of a real environment, such modifications to the content data are usually unnecessary because such an environment contains more content data than the content data used to display it in a particular display orientation. The additional data required to generate content with a modified display orientation can be easily obtained from the data representing the entire virtual three-dimensional environment or the entire digital twin.

[0048] This is visualized in Figure 3, which displays two different display orientations of a specific stereoscopic content on a mobile autostereoscopic display device, namely a virtual beach scene. In the upper part of Figure 3, the beach scene is displayed in landscape orientation, and in the lower part of Figure 3, the beach scene is displayed in portrait orientation. In landscape orientation, different parts of the beach scene are visible compared to portrait orientation, while other parts (e.g., the central part) are present in both orientations. For completeness, Figure 4 shows the entire beach scene.

[0049] One of the most striking features of a glasses-free stereoscopic display is that it allows the viewer to perceive a displayed three-dimensional scene without the need for specialized eyewear such as headsets, head-mounted displays, or glasses. An attractive feature that can be implemented in such a device is the ability to adapt the displayed content to the device's position and orientation. When this is done to the extent that the displayed content represents a scene fixed in the real world rather than on a screen, the device's screen essentially functions as a virtual window. The absence of specialized eyewear allows the viewer to experience their physical presence in the real world, while at the same time, the glasses-free stereoscopic display forms a virtual window to another world—a truly believable virtual world that is also three-dimensional.

[0050] The method of the present invention, visualized in Figure 3, is particularly advantageous for autopsis stereoscopic display devices with virtual window functionality, because the displayed virtual scene is typically larger than the screen (i.e., virtual window) itself.

[0051] The present invention further relates to a glasses-free stereoscopic display device configured to display first content and second content to one or more viewers, wherein the glasses-free stereoscopic display device is -A glasses-free stereoscopic display screen comprising an array of display pixel elements for generating a display output, and a view forming configuration provided on the array, which can direct the display output from different display pixel elements to different spatial positions within the field of view of the glasses-free stereoscopic display device in order to enable the display of first content and second content. - A weaver configured to receive content data representing the first content and the second content, and to weave the first content and the second content for a glasses-free stereoscopic display screen, - The system comprises a processor and memory, the memory comprising computer executable code that, when executed by the processor, causes the processor to perform a method for oriented content onto the above-described autostereoscopic display device.

[0052] In one embodiment, the display device includes a processor and memory, the memory containing computer-executable code that, when executed by the processor, causes the processor to execute a method for determining the position of subpixels in the above-described pixel arrangement.

[0053] The present invention further relates to a computer-readable medium containing temporary or non-temporary data representing instructions causing a processor system to perform a method for oriented content onto a glasses-free stereoscopic display device as described above.

[0054] The present invention further relates to software configured to perform a method for oriented content onto a glasses-free stereoscopic display device as described above, when executed on a computer.

Claims

1. A method for orienting content on a naked-eye stereoscopic display device in order to display the first content and the second content to one or more viewers, - A naked-eye stereoscopic display device, A glasses-free stereoscopic display screen comprising: an array of display pixel elements for generating display output; and a view forming configuration associated with the array, which can direct the display output from different display pixel elements to different spatial positions within the field of view of the glasses-free stereoscopic display device in order to enable the display of first content and second content; The steps of providing a glasses-free stereoscopic display device comprising: a weaver configured to receive content data representing the first content and the second content, and to weave the first content and the second content for the glasses-free stereoscopic display screen; - The step of simultaneously displaying the first content and the second content to one or more viewers of the naked-eye stereoscopic display device, wherein the displayed first and second content have an initial display orientation on the naked-eye stereoscopic display screen, and the step of displaying the first content and the second content is o The weaver receives content data representing the first content and the second content, and then, o Weaving the first content and the second content for the naked-eye stereoscopic display screen by determining, for each display pixel element in the array, whether each display pixel element provides a display output of the first content or a display output of the second content, wherein the array has an initial array orientation as viewed from the viewpoint of the weaver, and then, o Accordingly, the display pixel elements are controlled to display the first content and the second content on the naked-eye stereoscopic display screen in the initial display orientation, - At a specific point in time during the display of the first and second contents, the naked-eye stereoscopic display device receives a command to modify the display orientation of the first and second contents on the naked-eye stereoscopic display screen by a known amount of rotation relative to the initial display orientation, thereby, after the execution of the command, the displayed first and second contents have the modified display orientation on the naked-eye stereoscopic display screen. After receiving the aforementioned command, - The weaving for the naked-eye stereoscopic display screen is performed in a modified array orientation with respect to the initial array orientation, with respect to the modified array orientation, by an amount of rotation equal to the known amount of rotation according to the received command, as viewed from the viewpoint of the weaver. - A method in which the received command is executed to correct the display orientation of the first and second contents on the naked-eye stereoscopic display screen by a known amount of rotation.

2. The method according to claim 1, wherein the known amount of rotation is 0° to 360°, and is particularly selected from the group of 90°, 180°, and 270°.

3. The aforementioned naked-eye stereoscopic display device - An eye-tracking system for determining the eye position of one or more viewers relative to the naked-eye stereoscopic display device, The method according to claim 1 or 2, further comprising: a head tracking system for determining the position of the head or head feature of the one or more viewers, representing the position of each of the one or more viewers' eyes relative to the naked-eye stereoscopic display device.

4. The method according to any one of claims 1 to 3, wherein the command to the naked-eye stereoscopic display device is a command given by a user of the naked-eye stereoscopic display device via a user interface, for example, via a keyboard shortcut, mouse, graphical user interface, gesture recognition device, or voice recognition device.

5. The method according to any one of claims 1 to 3, wherein the command to the naked-eye stereoscopic display device is a command given by a component of the naked-eye stereoscopic display device, or by a further device configured to use a measured or estimated orientation of the naked-eye stereoscopic display device relative to the ground or to a viewer of the naked-eye stereoscopic display device in order to determine whether to give the command.

6. The method according to claim 5, wherein the component or the further device is configured to compare the measured or estimated orientation of the naked-eye stereoscopic display device with respect to the ground or with respect to the viewer of the naked-eye stereoscopic display device, respectively, with a preset value of the orientation of the naked-eye stereoscopic display device with respect to the ground or with respect to the viewer of the naked-eye stereoscopic display device, and to determine to give the command based on the comparison made.

7. The method according to claim 5 or 6, wherein the measured or estimated orientation is obtained by a measuring instrument selected from the group consisting of a gyroscope, magnetometer, accelerometer, gravimeter, and inclinometer.

8. The method according to any one of claims 1 to 7, wherein the view forming configuration includes a configuration based on the principle of a lenticular lens, a parallax barrier, or a directional backlight.

9. The method according to any one of claims 1 to 8, wherein the first and second content independently includes any other content such as video, photographs, still images, moving images, graphical user interfaces, graphical objects, animations, television broadcasts, live feeds, or any other content that is broadcast over the Internet or other networks or stored on a storage medium for playback.

10. The method according to claim 9, wherein the first and second contents are left-eye content intended to be viewed by the viewer's left eye and right-eye content intended to be viewed by the viewer's right eye, and the left-eye content and the right-eye content together form a stereoscopic pair of stereoscopic content to be viewed by a single viewer.

11. The method according to claim 10, wherein the rotation of the naked-eye stereoscopic display screen relative to the viewer is checked to such an extent that, if not corrected, the viewer perceives a depth inversion, as the left-eye content is directed towards the viewer's right eye and the right-eye content is directed towards the viewer's left eye.

12. The method according to claim 11, wherein if a rotation is observed that causes a depth inversion for the viewer, the left-eye content and the right-eye content are swapped such that the left-eye content is again directed to the left eye of the viewer and the right-eye content is again directed to the right eye of the viewer.

13. The method according to any one of claims 1 to 12, wherein, after receiving the command, the weaver receives modified content data representing the modified first content and the modified second content.

14. The method according to claim 13, wherein the modified first content and the modified second content are modified such that their aspect ratios correspond to the aspect ratio of the array of display pixel elements.

15. The aforementioned aspect ratio is, - Action to remove one or more areas from the first content and the second content, - An action to resize one or more areas of the first content and the second content, The method according to claim 14, modified by one or more actions selected from the group of actions that add one or more areas to the first content and the second content.

16. A glasses-free stereoscopic display device configured to display first content and second content to one or more viewers, wherein the glasses-free stereoscopic display device is - A naked-eye stereoscopic display screen comprising an array of display pixel elements for generating display output, and a view forming configuration associated with the array, which can direct the display output from different display pixel elements to different spatial positions within the field of view of the naked-eye stereoscopic display device in order to enable the display of first content and second content, - A weaver configured to receive content data representing the first content and the second content, and to weave the first content and the second content for the naked-eye stereoscopic display screen, A naked-eye stereoscopic display device comprising a processor and memory, wherein the memory, when executed by the processor, comprises computer-executable code that causes the processor to perform the method according to any one of claims 1 to 15.

17. A computer-readable medium containing temporary or non-temporary data representing instructions for causing a processor system to perform the method according to any one of claims 1 to 15.

18. Software configured to perform the method described in any one of claims 1 to 15 when executed on a computer.

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