Autostereoscopic display screen equipped with a very-high-definition pixel panel

Abstract

The invention relates to a screen (10) for displaying an autostereoscopic image with N viewpoints ordered from 1 to N, formed from a series of even-numbered viewpoints and a series of odd-numbered viewpoints, the screen comprising a panel (30) of pixels arranged in ordered rows (L1, L2, L3, L4) and columns, each pixel being composed of a plurality of active subpixels (SP) in 10 different colors, each assigned to a viewpoint of the image; an ordered array (40) of cylindrical lenses (42) mounted on the pixel panel, each lens being inclined relative to the columns of the panel by an angle (α) equal to arctan (1 / 6) such that the series of even-numbered viewpoints and the series of odd-numbered viewpoints of the autostereoscopic image can be interleaved with one another.

Description

[0001] DESCRIPTION

[0002] TITLE OF THE INVENTION: AUTOSTEREOSCOPIC DISPLAY SCREEN EQUIPPED WITH A VERY HIGH-DEFINITION PIXEL PANEL

[0003] Technical field of the invention

[0004] The invention relates to an autostereoscopic display screen equipped with a very high definition pixel panel.

[0005] Technological background

[0006] Autostereoscopy is a technique that allows the display of three-dimensional images without requiring the observer to wear special glasses. This technique is known in itself, particularly from patent documents W02006 / 024764, WO2014 / 041504, WO2013 / 140363, WO2014 / 016768,

[0007] WO2019 / 063897, WO2019 / 207235, WO2022 / 175053 on behalf of the applicant.

[0008] In general, an autostereoscopic image consists of a plurality of nested elementary image strips, each corresponding to views of the same object or scene from different viewpoints. A selector device, typically consisting of a cylindrical lenticular array or a parallax barrier, is positioned in front of the display screen to allow the projection of a pair of elementary images corresponding to two different viewpoints of the scene, respectively towards the two eyes of the observer, thus creating an impression of depth in the observer's brain.

[0009] The applicant has already proposed an autostereoscopic display for an N-viewpoint image, comprising a matrix of pixels arranged in rows and columns, each pixel being composed of a plurality of sub-pixels of different colors. The display is further surmounted by an array of identical cylindrical lenticules, each with a focal length configured to reflect light rays from the display to infinity. The spacing of the cylindrical lenticule array is precisely calculated so that the observer, at a predetermined distance from the display, sees the images follow one another due to a magnifying effect of the lenticule array.

[0010] This magnifying effect results from the fact that a lens placed at the correct distance (its focal length) magnifies the sub-pixel(s) that are aligned with its optical axis and the pupil of the observer's eye. If the lens magnifies N times, the sub-pixel(s) seen through the lens is / are perceived as N times larger than it / they actually is, and obscures for the eye receiving light through this lens the Nl other sub-pixels that are not aligned as described above.

[0011] The very principle of the lenticular lens prevents the viewer from experiencing continuous parallax of the scene displayed over a 180° angle. The viewing angle is therefore subdivided into bands called "lobes," within which the parallax is discretized. In each lobe, the N viewpoints can be perceived successively. When moving from one lobe to the next, the same sequence of N viewpoints is found in the following lobe, and so on across the entire width of the screen's viewing area. The angular width of the lobes is defined by both the lenticular lens's pitch and its focal length.

[0012] Autostereoscopic screens require subdividing the lobes into discrete, perfectly discernible sub-parts, the individual width of which in the lobe cannot exceed the average interpupillary distance, which is 6.5cm.

[0013] Also, one of the keys to the performance of the autostereoscopic screens currently offered by the applicant is the control of the resolving power of the optical components which are developed specifically for each pixel panel.

[0014] The applicant has previously proposed and already operates screens consisting of a pixel panel surmounted by a lenticular array, each lens of which is inclined at an angle of approximately 18° relative to the columns of the pixel panel.

[0015] US2015 / 0341623 also describes an autostereoscopic display comprising a display panel formed by a first substrate with a plurality of chevron pixels and a second substrate bonded to the first substrate on which a mask with apertures is arranged. It further includes a sheet forming a lenticular grating positioned above the display panel. The apertures formed in the substrate mask are inclined at a slope parallel to one side of each chevron pixel. Thus, unlike displays with a grating inclined relative to the pixels, the display described in this document has a grating inclined at the same angle as the pixels, so that it extends parallel to them. This helps to limit the overlap of viewpoints.

[0016] High-definition panels are now available that seem promising for use in autostereoscopic displays. These panels are commonly known as UHD (Ultra High Definition) or 4K and 8K displays. A screen's resolution is defined as the number of pixels displayed horizontally and vertically. Currently, the term "4K screen" refers to a screen with a minimum resolution of 3840 x 2160 pixels, which is four times the number of pixels of a Full HD screen. An 8K screen has four times the resolution of a 4K screen. Throughout this text, the term UHD panel refers to a very high-definition panel that is at least a 4K screen.

[0017] The resolution of a pixel panel refers to the pixel density on a given surface. In other words, a screen's resolution is the ratio between the total number of pixels displayed by the screen and its diagonal size. Thus, two screens with the same definition can have different resolutions depending on their size.

[0018] Because very high resolution panels contain more pixels for the same surface area than similar lower resolution panels, the pixels are smaller.

[0019] To maintain sufficient brightness, it might seem logical that the active pixel areas of very high-resolution panels on some screens should occupy as much of their allocated surface as possible. However, on some screens, the opposite is true: horizontal rows of pixels represent only 50% of the surface vertically on average, and columns of sub-pixels, viewed vertically, occupy only about 60%.

[0020] The active areas of these new very high-resolution panels are, compared to similar lower-resolution panels, smaller relative to the opaque black areas that horizontally and vertically separate the rows and columns of pixels.

[0021] The inventors have found that such a very high-resolution panel, equipped with a lenticular grating inclined at an 18° angle and used according to the applicant's patents, does not achieve the expected levels of quality. In particular, numerous black moiré patterns are observed, which degrade the viewing quality and make these panels unsuitable for autostereoscopic use according to currently known techniques.

[0022] The inventors therefore sought to develop a new screen adapted to very high definition panels which significantly improve the quality of observation.

[0023] Objectives of the invention

[0024] The invention aims to provide an autostereoscopic screen equipped with a very high resolution slab-type pixel panel.

[0025] The invention also aims to provide, in at least one embodiment, such a screen which has a strong separating power.

[0026] The invention also aims to provide, in at least one embodiment, such a screen which can be equipped with a real-time detection system for the position of the observer's eyes in order to adapt the display to this detected position.

[0027] Description of the invention

[0028] To achieve this, the invention relates to a display screen of an autostereoscopic image with N viewpoints ordered from 1 to N, consisting of a series of even viewpoints and a series of odd viewpoints, N being an integer greater than or equal to 2.

[0029] The display screen according to the invention is characterized in that it comprises: a pixel panel arranged in horizontal rows and ordered vertical columns, each pixel being composed of a plurality of active vertical sub-pixels with straight vertical edges of different colors, each assigned to a viewpoint of the image, and opaque inactive areas forming a portion of black horizontal line spacing and / or vertical column spacing of said panel, said black line spacing thus formed having a height substantially equal to the height of the active sub-pixels of the adjacent rows, and the black column spacing thus formed having a width substantially equal to the width of the active sub-pixels of the adjacent columns, an ordered array of cylindrical lenses mounted on said pixel panel,each lens being inclined with respect to the straight vertical edges of the subpixels of the pixels in the vertical columns of the slab at an angle equal to arctan (1 / 6) so as to be able to interlace said series of even viewpoints and said series of odd viewpoints of the autostereoscopic image consisting of assigning: o if N is an even integer, under each lens of the grating, the viewpoints of one of the two series of even or odd viewpoints to the odd lines of the slab and the viewpoints of the other series of viewpoints to the even lines of the slab, o if N is odd, under each odd lens of the grating, the viewpoints of one of the two series of even or odd viewpoints, called the first series, to the odd lines of the slab and the viewpoints of the other series, called the second series, to the even lines of the slab, and under each even lens of the grating,the even viewpoints of said second series to the odd lines of the slab and the viewpoints of the first series to the even lines of the slab, each lens thus allowing the decoding of a viewpoint of the autostereoscopic image by reading the sub-pixels encoding that viewpoint of the image, one line out of two, the intermediate lines for this viewpoint being formed from the opaque inactive areas of the sub-pixels of the adjacent viewpoints.

[0030] The display screen according to the invention thus allows the use of a specific panel, such as a UHD panel, which is characterized by pixels arranged in ordered rows and columns. Each pixel is composed of a plurality of active sub-pixels of different colors and opaque inactive areas forming a portion of the black interline and / or intercolumn spaces of said panel. These black interline spaces thus formed have a height substantially equal to the height of the active sub-pixels of the adjacent rows, and the black intercolumn spaces thus formed have a width substantially equal to the width of the active sub-pixels of the adjacent columns. The defining characteristic of the specific panel of the invention is the typology and distribution of the active and opaque areas of the panel.This typology is often encountered on UHD panels, but the invention is not limited to UHD panels only and extends to any panel whose black line spacing has a height substantially equal to the height of the active sub-pixels and whose black column spacing has a width substantially equal to the width of the active sub-pixels.

[0031] The screen according to the invention allows the use of such a specific panel to display autostereoscopic images. According to the invention, each pixel of the panel is composed of a plurality of active sub-pixels of different colors, each assigned to a viewpoint of the image. According to the invention, the addressing of viewpoints is therefore done by sub-pixel and not by entire pixel.

[0032] The screen according to the invention is further surmounted by a specific lenticular array which is formed of cylindrical lenses inclined with respect to the columns of the panel at an angle equal to arctan (1 / 6), that is to say an angle of approximately 9°. In addition, the viewpoints of the autostereoscopic image are ordered from 1 to N, forming a series of odd viewpoints and a series of even viewpoints.

[0033] These viewpoints are intertwined on the pixel grid.

[0034] This interlacing depends on the number of viewpoints of the image to be displayed.

[0035] If N is an even integer, then under each lens of the grating, we assign the viewpoints of one of the two series of even or odd viewpoints to the odd lines of the slab and the viewpoints of the other series of viewpoints to the even lines of the slab.

[0036] If N is odd, then under each odd lens of the grating, we assign the viewpoints of one of the two series of even or odd viewpoints, called the first series, to the odd lines of the slab and the viewpoints of the other series, called the second series, to the even lines of the slab, and we assign under each even lens of the grating, the even viewpoints of said second series to the odd lines of the slab and the viewpoints of the first series to the even lines of the slab.

[0037] Thus, each lens in the lenticular array allows decoding a viewpoint of the autostereoscopic image by reading the sub-pixels encoding that viewpoint of the image, one line out of two. The intermediate lines for this viewpoint are formed by the opaque inactive areas of the sub-pixels of adjacent viewpoints.

[0038] The inventors realized that this interlacing of even and odd viewpoints in the ordered series of viewpoints makes it possible to almost completely eliminate moiré patterns while ensuring a high resolving power.

[0039] Furthermore, a screen according to the invention allows that for a given number of viewpoints, the lenses of the lenticular array are twice as thin as on a homologous screen whose lenses are inclined at an angle equal to arctan(l / 3), while the vertical resolution of each of the viewpoints is divided by two.

[0040] A screen according to the invention allows for the display of multi-viewpoint images of photographic quality, for example, from around thirty viewpoints, without requiring the use of large lenses. If the panel used is an 8K panel, the proposed interlacing allows the lens size to be halved compared to a similar 8K screen with an 18° grating. The vertical resolution is then halved, becoming equivalent to that of a 4K screen. The resolution of an 8K screen with an 18° grating allows for the display of twice as many viewpoints as its 4K counterparts, with each 8K viewpoint having a vertical resolution twice that of the 4K screen.With the change in the orientation of the lenticular network and the resulting interlacing, the vertical resolution of 8K at 9° is the same as that of 4K at 18°, and the resolution in number of usable viewpoints is: 8 viewpoints X 2 (interlacing) X 2 (from 4K to 8K) = 32 viewpoints for an equivalent lenticular network and an identical resolution per viewpoint.

[0041] For example, an 8K screen according to the invention (i.e. with microlenses inclined at an angle of approximately 9°) with 32 viewpoints uses microlenses of the same pitch as an equivalent 4K screen with 8 viewpoints (with microlenses inclined at an angle of approximately 18°).

[0042] Advantageously and according to the invention, said lenticular network is mounted on said slab so as to cover only a portion of said slab with pixels so as to be able to form a mixed display screen of the autostereoscopic image at N viewpoints on the portion of the slab covered by said lenticular network and of a flat 2D image on the portion of the slab devoid of the lenticular network.

[0043] According to this advantageous variant, the screen can be used to present a dual 2D and 3D display. Such a screen can be used, for example, for video conferencing or training. In this variant, one part of the screen is configured to display an autostereoscopic image (the part with the lenticular lens array, whose lenses are inclined at an angle equal to arctan(l / 6)), and the other part of the screen is configured to display a flat image (the part without the lenticular lens array), such as a text file, a PowerPoint® presentation, etc. The lenticular portion of the screen can be used to provide individual or group autostereoscopic 3D display.

[0044] In the absence of a lenticular lens, this hybrid use of the screen allows for the display of traditional written, graphic, or photographic documents without alteration. This combination bypasses the need for 2D / 3D compatibility across the entire screen surface.

[0045] In a videoconferencing context, the screen is advantageously combined with an image acquisition camera of the observer and a processing unit configured to derive at least two distinct images, representing at least two distinct viewpoints of the observer to be projected. In a videoconference, preferably, each participant has a screen according to the invention and an image acquisition camera of the other participant, such that the image acquired from the first participant is projected onto the display screen of the second participant, and vice versa. Thus, each participant sees the 3D image of the other participant on the portion of the display screen equipped with the lenticular lens, giving each participant the impression of being face-to-face with the other. This sensation is all the more intense when the projected image of each participant is at a 1:1 scale.

[0046] Advantageously and according to the invention, the screen further includes a device for detecting at every instant the position of the observer's eyes relative to said pixel panel so as to be able to adapt the assignment of the viewpoints of the autostereoscopic image to the position of the observer's eyes.

[0047] According to this variant, the screen according to the invention can be equipped with an eye-tracking device for the observer (better known by the English term "tracking" device) to allow the real-time display of the viewpoints to be addressed to each eye of the observer.

[0048] The screen according to this variant makes it possible to identify the position and orientation of the observer's head in relation to the pixel panel, that is to say, to detect the movements of the observer's eyes in relation to the screen and to slide the viewpoints in the lobe visible to the observer so as to present the chosen viewpoints to the observer.

[0049] A screen according to this variant makes it possible in particular to implement the principles already described in application WO2022 / 175053 on behalf of the applicant.

[0050] Advantageously and according to the invention, the pixel panel is an ultra-high definition (UHD) panel. As previously stated, such a panel has a specific typology, consisting of pixels arranged in ordered rows and columns, each pixel being composed of a plurality of active sub-pixels of different colors and opaque inactive areas forming a portion of black inter-rows and / or inter-columns of said panel, said black inter-rows thus formed having a height substantially equal to the height of the active sub-pixels of the adjacent rows, and the black inter-columns thus formed having a width substantially equal to the width of the active sub-pixels of the adjacent columns.

[0051] The invention also relates to a method for displaying an autostereoscopic image with N viewpoints ordered from 1 to N, consisting of a series of even viewpoints and a series of odd viewpoints, N being an integer greater than or equal to 2, on a very high definition (UHD) pixel panel arranged in horizontal rows and ordered vertical columns, each pixel being composed of a plurality of active vertical sub-pixels with straight edges of different colors, each assigned to a viewpoint of the image, and opaque inactive areas forming a portion of the black horizontal line spacing and / or vertical column spacing of said panel, said black line spacing thus formed having a height substantially equal to the height of the active sub-pixels of the adjacent rows, and the black column spacing thus formed having a width substantially equal to the width of the active sub-pixels of the adjacent columns.

[0052] The method according to the invention is characterized in that it comprises: mounting an ordered array of cylindrical lenses on said pixel panel, each lens being inclined with respect to the vertical straight edges of the subpixels of the pixels in the columns of the panel at an angle equal to arctan(1 / 6), if N is an even integer; assigning, under each lens of the array, the viewpoints of one of the two series of even or odd viewpoints to the odd rows of the panel and assigning the viewpoints of the other series of viewpoints to the even rows of the panel, if N is an odd integer; assigning, under each odd lens of the array, the viewpoints of one of the two series of even or odd viewpoints, called the first series, to the odd rows of the panel and assigning the viewpoints of the other series, called the second series, to the even rows of the panel; and assigning, under each even lens of the array,of the viewpoints of said second series to the odd lines of the slab and the assignment of the viewpoints of the first series to the even lines of the slab, so as to interlace said series of even viewpoints and said series of odd viewpoints of the autostereoscopic image so that each lens of said lenticular array allows the decoding of a viewpoint of the autostereoscopic image by reading the sub-pixels encoding that viewpoint of the image, one line out of two, the intermediate lines for that viewpoint being formed from the opaque inactive areas of the sub-pixels of the adjacent viewpoints.

[0053] The advantages and technical effects of a screen according to the invention apply mutatis mutandis to a process according to the invention.

[0054] The invention also relates to a screen and a method characterized in combination by all or part of the characteristics mentioned above or below.

[0055] List of figures

[0056] Other objects, features and advantages of the invention will become apparent from the following description, given by way of non-limiting example only, and which refers to the accompanying figures in which:

[0057] [Fig. 1] is a partial schematic view of a display screen according to one embodiment of the invention,

[0058] [Fig. 2] is a schematic view of the distribution of viewpoints on a display screen according to an embodiment of the invention, in which the number of viewpoints N of the image is odd,

[0059] [Fig. 3] is a schematic view of the distribution of viewpoints on a display screen according to an embodiment of the invention in which the number of viewpoints N of the image is even,

[0060] [Fig. 4] is a schematic view of a display screen according to an embodiment of the invention comprising a 2D portion and a 3D portion, the 3D portion being further equipped with a device for tracking the observer's head.

[0061] Detailed description of an embodiment of the invention

[0062] In the figures, the scales and proportions are not strictly respected for the purposes of illustration and clarity.

[0063] Identical, similar or analogous elements are designated by the same references in all figures.

[0064] Figure 1 schematically illustrates a display screen 10 comprising a pixel panel 30, which will be described in more detail in connection with Figure 2, surmounted by an array 40 of cylindrical lenses 41, 42. As will be described in more detail in connection with Figure 2, the lenses 41, 42 of the array 40 are inclined relative to the direction of the columns of the panel 30 at an angle equal to arctan(1 / 6). In Figure 1, this inclination has been exaggerated for illustrative purposes only. The display screen 10 is intended to display an autostereoscopic image with N viewpoints, consisting of a series of even viewpoints and a series of odd viewpoints, where N is an integer greater than or equal to 2.

[0065] As an example and as shown in Figure 2, if the autostereoscopic image to be displayed includes 17 viewpoints (N=17), the image is formed from the series of odd viewpoints numbered 1, 3, 5, 7, 9, 11, 13, 15 and 17 and the series of even viewpoints numbered 2, 4, 6, 8, 10, 12, 14 and 16.

[0066] Figure 2 schematically illustrates a 30-pixel screen panel according to an embodiment of the invention. This panel comprises a plurality of pixels arranged in rows L1, L2, L3, L4 and columns C1, C2, C3, ordered. Each pixel of the panel is composed of a plurality of active sub-pixels SP of different colors (R, G, B), each assigned to a viewpoint of the autostereoscopic image to be displayed, and opaque inactive areas forming a portion of the black line spacing and / or column spacing of the panel. The black line spacings thus formed have a height substantially equal to the height of the active sub-pixels SP of the adjacent rows, and the black column spacings thus formed have a width substantially equal to the width of the active sub-pixels SP of the adjacent columns.

[0067] In Figure 2, only the line spacing IL1 and the column spacing ICI have been referenced to avoid cluttering the figure. Those skilled in the art understand that the slab comprises a succession of lines and line spacings in the vertical direction and a succession of columns and column spacings in the horizontal direction.

[0068] The screen 10 is further surmounted by an ordered array 40 of cylindrical lenses. In Figure 2, only the first lens 41 and a portion of the second lens 42 are shown. Those skilled in the art understand that other lenses are arranged to the right of lens 42 and so on to the edge of the pixel panel 30.

[0069] Each lens 41, 42 is inclined relative to the columns of slab 30 at an angle ex equal to arctan (1 / 6), which corresponds approximately to an angle of 9°.

[0070] The combination of this specific ex angle and the specific typology of the 30-pixel slab allows the series of even viewpoints and the series of odd viewpoints of the autostereoscopic image to be interlaced.

[0071] This interlacing, represented in Figure 2, consists of assigning, under the odd lenses 41 of the grating, the odd viewpoints of the autostereoscopic image to the odd lines of the slab and the even viewpoints of the autostereoscopic image to the even lines of the slab and assigning, under the even lenses 42 of the grating, the odd viewpoints of the image to the even lines of the slab and the even viewpoints of the image to the odd lines of the slab.

[0072] It could also be decided to reverse the series of even and odd viewpoints, by assigning under the odd lenses of the grating, the even viewpoints of the image to the odd lines of the slab and the odd viewpoints of the image to the even lines of the slab, and by assigning under the even lenses of the grating, the odd viewpoints of the image to the odd lines of the slab and the even viewpoints of the image to the even lines of the slab.

[0073] According to the embodiment shown in Figure 2, the SP subpixels of the L1 line of the slab display, in order and starting from the left of the figure, all the odd viewpoints of the autostereoscopic image.

[0074] As an example, the first R-color sub-pixel of line L1 displays viewpoint 1. The second V-color sub-pixel of line L1 displays viewpoint 3. The third B-color sub-pixel of line L1 displays viewpoint 5. And so on for all sub-pixels arranged under lens 4L. The same assignment is then found under the other odd lenses of the lenticular array not shown in Figure 2, and the assignment under the even lenses of the array is reversed between even and odd viewpoints.

[0075] The SP subpixels of line L2 display, in order and starting from the left of the figure, all the even-numbered viewpoints of the autostereoscopic image. For example, the second subpixel of color V in line L2 displays viewpoint 2. The third subpixel of color B in line L2 displays viewpoint 4. The fourth subpixel of color R in line L2 displays viewpoint 6. And so on for all the subpixels arranged under lens 4L. The same assignment is then found under the other odd-numbered lenses of the lenticular array not shown in Figure 2, and the assignment under the even-numbered lenses of the array is reversed between the even and odd viewpoints.

[0076] This interlacing of even and odd viewpoints allows an observer to perceive, through the lenticular network, a viewpoint of the image by visualizing the sub-pixels encoding this viewpoint of the image, one line out of two, the intermediate lines for this viewpoint being formed from the opaque inactive areas of the sub-pixels of the adjacent viewpoints.

[0077] As an example, we observe that viewpoint 1 appears on every other line across the entire pixel grid, with a sub-pixel offset from one line to the next. Thus, viewpoint 1 is displayed by the first sub-pixel of line L1 (color R) and by the second sub-pixel of line L3 (color V). The intermediate line L2 between lines L1 and L3 displays an inactive area.

[0078] In other words, the lenticular array is oriented relative to the columns of the panel such that the optical axis aligns with a subpixel every two odd-numbered horizontal lines and with the intersubpixels of the other even-numbered lines. By translating half a subpixel, the same optical axis encounters the subpixel of the even-numbered line directly below and the black intersubpixel of the odd-numbered lines, and so on. As the optical axis moves with the observer's eye, it passes successively from odd-numbered to even-numbered subpixels, and so on, until the lobe transition. If we consider the succession of active and dark areas traversed by the optical axis of each lens during the horizontal movement of an observing eye, then it resembles a checkerboard, as seen in Figure 2.

[0079] Figure 3 illustrates the invention for an even number of viewpoints. In this embodiment, the autostereoscopic image to be displayed comprises 18 viewpoints (N=18), the image is formed from the series of odd viewpoints numbered 1, 3, 5, 7, 9, 11, 13, 15 and 17 and the series of even viewpoints numbered 2, 4, 6, 8, 10, 12, 14, 16 and 18.

[0080] In this case, the assignment under each lens (even or odd) is identical. Each lens 41, 42 always allows decoding a viewpoint of the autostereoscopic image by reading the sub-pixels encoding this viewpoint of the image, one line out of two, the intermediate lines for this viewpoint being formed from the opaque inactive areas of the sub-pixels of the adjacent viewpoints.

[0081] The difference with Figure 2 lies in the viewpoints under lens 42 which are identical to those under lens 41 whereas in the embodiment of Figure 2 with an odd number N of viewpoints, the viewpoints under the odd lens are offset by one line relative to the viewpoints under the even lens.

[0082] Figure 4 schematically illustrates an embodiment of the invention in which a pixel panel 30, according to the invention's typology, is surmounted by a lenticular lens array 40 on only a portion 31 of the panel. This embodiment thus forms a mixed display screen showing a 2D image (on the right side of the screen 32 not surmounted by a lenticular lens array) and a 3D autostereoscopic image (on the left side of the screen 31 surmounted by a lenticular lens array 40).

[0083] The principles governing the 3D part of the screen are identical to those described in connection with Figure 1. The principles governing the 2D part of the screen are those governing a classic 2D screen such as a television.

[0084] According to the embodiment of Figure 3, the screen is further associated with an observer eye tracking device 50 60 (better known by the English name of "tracking" device) to allow the viewpoints to be displayed in real time to each eye of the observer.

[0085] The screen, according to this embodiment, allows the position of the observer's pupils (or the position and orientation of their head) to be identified relative to the pixel panel. In other words, it detects the movements of the observer's eyes relative to the screen and determines what they will see if the initial display remains unchanged. This is achieved by reassigning to each sub-pixel of the screen the data from the only two viewpoints to be displayed to allow for correct and comfortable vision, regardless of the initial screen configuration in terms of the number of viewpoints and the flat color distance. This involves recreating flat colors by recomposition at the new viewing distance and sliding the recreated viewpoints within the lobe visible to the observer at each new viewing position.

[0086] According to this variant, the tracking device 50 detects, at every moment, the position of the observer's eyes 60 in relation to the screen 10.

[0087] The tracking device 50 can be of any known type. For example, it could be the device marketed under the reference Intel RealSense SR300 (SDK1 Gold Release). This is an RGBD time-of-flight camera, accompanied by an optimized face tracking library. Of course, other tracking devices can be used without compromising the principles of this embodiment.

[0088] The position detected by the tracking device is transmitted in real time to a computing module, for example, a computer 52. This module then determines the image viewpoints to be displayed on the pixel panel so that they appear to each of the two eyes of the observer 60, whose position has been determined by the tracking device. Further information on the use of a tracking device for autostereoscopy can be found in the applicant's patents, in particular documents WO2019063897 and WO2022175053.

Claims

DEMANDS 1. Display screen (10) of an autostereoscopic image with N viewpoints ordered from 1 to N, consisting of a series of even viewpoints and a series of odd viewpoints, N being an integer greater than or equal to 2, characterized in that it comprises: - a slab (30) of pixels arranged by horizontal rows (L1, L2, L3, L4) and ordered vertical columns, each pixel being composed of a plurality of active vertical sub-pixels with straight vertical edges (SP) of different colors, each assigned to a viewpoint of the image, and opaque inactive areas forming a portion of black horizontal line spacing and / or vertical column spacing of said slab, said black line spacings (IL1) thus formed having a height substantially equal to the height of the active sub-pixels of the adjacent rows, and the black column spacings (ICI) thus formed having a width substantially equal to the width of the active sub-pixels (SP) of the adjacent columns, - an ordered array (40) of cylindrical lenses (41, 42) mounted on said pixel panel, each lens (41, 42) being inclined with respect to the vertical right edges of the subpixels of the pixels in the vertical columns of the panel by an angle (ex) equal to arctan (1 / 6) so as to be able to interlace said series of even viewpoints and said series of odd viewpoints of the autostereoscopic image consisting of assigning: o if N is an even integer, under each lens (41, 42) of the array, the viewpoints of one of the two series of even or odd viewpoints to the odd rows (L1, L3) of the panel and the viewpoints of the other series of viewpoints to the even rows (L2, L4) of the panel, o if N is odd, under each odd lens (41) of the array, the viewpoints of one of the two series of even or odd viewpoints, called the first series, at the odd lines (L1, L3) of the slab and the viewpoints of the other series, called the second series, at the even lines (L2,L4) of the slab, and under each even lens (42), of the network, the viewpoints of said second series at odd lines (LI, L3) of the slab and the viewpoints of the first series at even lines (L2, L4) of the slab, each lens (41, 42) thus allowing to decode a viewpoint of the autostereoscopic image by reading the sub-pixels encoding this viewpoint of the image, one line out of two, the intermediate lines for this viewpoint being formed from the opaque inactive areas of the sub-pixels of the adjacent viewpoints.

2. Display screen according to claim 1, characterized in that said lenticular network (40) is mounted on said slab (30) so as to cover only a portion of said slab with pixels so as to be able to form a mixed display screen of the autostereoscopic image at N viewpoints on the portion (31) of the slab covered by said lenticular network and of a flat 2D image on the portion (32) of the slab devoid of the lenticular network.

3. Display screen according to one of claims 1 or 2, characterized in that it further comprises a detection device (50) at each instant of the position of the observer's eyes (60) with respect to said pixel panel (30) so as to be able to adapt the assignment of the viewpoints of the autostereoscopic image to the position of the observer's eyes.

4. Display screen according to any one of claims 1 to 3, characterized in that said slab (30) of pixels is a very high definition (UHD) slab.

5. A method for displaying an autostereoscopic image with N viewpoints ordered from 1 to N, consisting of a series of even viewpoints and a series of odd viewpoints, N being an integer greater than or equal to 2, on a slab (30) of pixels arranged in horizontal rows and ordered vertical columns, each pixel being composed of a plurality of active vertical sub-pixels with straight vertical edges (SP) of different colors, each assigned to a viewpoint of the image, and opaque inactive areas forming a portion of the black horizontal and / or vertical inter-column spaces of said slab, said black inter-line spaces thus formed having a height substantially equal to the height of the active sub-pixels of the adjacent rows, and the black intercolumns thus formed having a width substantially equal to the width of the active sub-pixels of the adjacent columns, said method being characterized in that it comprises: mounting an ordered array (40) of cylindrical lenses (41, 42) on said pixel panel, each lens being inclined with respect to the vertical straight edges of the sub-pixels of the pixels in the columns of the panel by an angle (ex) equal to arctan(l / 6), if N is an even integer, F assignment under each lens (41, 42) of the array, of the viewpoints of one of the two series of even or odd viewpoints to the odd rows (L1, L3) of the panel and the assignment of the viewpoints of the other series of viewpoints to the even rows (L2, L4) of the panel, if N is an odd integer, the assignment, under each odd lens (41) of the array, of the viewpoints of one of the two series of viewpoints even or odd, called the first series, on the odd lines (LI,L3) of the slab and the assignment of the viewpoints of the other series, called the second series, to the even lines (L2, L4) of the slab, and the assignment under each even lens (42) of the grating, of the viewpoints of said second series to the odd lines (L1, L3) of the slab and the assignment of the viewpoints of the first series to the even lines (L2, L4) of the slab, so as to interleave said series of even viewpoints and said series of odd viewpoints of the autostereoscopic image so that each lens (41, 42) of said lenticular grating allows the decoding of a viewpoint of the autostereoscopic image by reading the subpixels encoding this viewpoint of the image, one line out of two, the intermediate lines for this viewpoint being formed from the opaque inactive areas of the subpixels of the adjacent viewpoints.

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