Method, system, processing device, and computer storage medium for evaluating viewpoint density

Abstract

A method, system, processing device and computer storage medium for evaluating the density of viewing points. The method includes: obtaining the number of viewing points of a display panel; comparing the spot radius of each viewing point with the pixel interval between the viewing point and the adjacent viewing point, and selecting one viewing point as the reference viewing point, and calculating the crosstalk value between other viewing points except the reference viewing point and the reference viewing point; evaluating the density of viewing points for autostereoscopic display according to the comparison results of the spot radius of each viewing point with the pixel interval between the viewing point and the adjacent viewing point and the calculated crosstalk value between other viewing points and the reference viewing point. The present disclosure can be used to select an appropriate number of viewing points when designing an autostereoscopic display device, or to evaluate the advantages and disadvantages of the number of viewing points of the current autostereoscopic display device, so as to achieve the optimal design of the number of viewing points of the autostereoscopic display device and improve the autostereoscopic display effect.

Description

Technical Field

[0001] The present disclosure relates to, but is not limited to, the field of intelligent display technology, and particularly relates to a method, a system, a processing device, and a computer storage medium for evaluating the viewpoint density. Background Art

[0002] A naked-eye 3D display device is a display device that can view a 3D display image without wearing auxiliary tools. The display principle of the naked-eye 3D display device is as follows: A lenticular cylinder or a parallax grating is placed in front of the display panel of the display device, so that the display image seen by the left eye is different from the display image seen by the right eye, thereby making the display image produce a 3D visual effect.

[0003] Currently, the naked-eye 3D display generally adopts the super multi view technology. However, how to select an appropriate number of viewpoints, or how to evaluate the advantages and disadvantages of the number of viewpoints of the current display screen, has become a problem to be solved in the field of naked-eye 3D technology and the manufacture of 3D display devices. Summary of the Invention

[0004] Embodiments of the present disclosure provide a method, a system, a processing device, and a computer storage medium for evaluating the viewpoint density, which can realize the optimal design of the number of viewpoints of the naked-eye 3D display device and improve the naked-eye 3D display effect.

[0005] Embodiments of the present disclosure provide a method for evaluating the viewpoint density, including: obtaining the number of viewpoints of a display panel; comparing the spot radius of each viewpoint with the image point interval between the viewpoint and the adjacent viewpoint, and selecting one viewpoint as a reference viewpoint, and calculating the crosstalk value between other viewpoints except the reference viewpoint and the reference viewpoint; evaluating the naked-eye stereoscopic display viewpoint density according to the comparison result of the spot radius of each viewpoint with the image point interval between the viewpoint and the adjacent viewpoint and the calculated crosstalk value between other viewpoints and the reference viewpoint.

[0006] In an exemplary embodiment, the light-emitting side of the display panel includes a plurality of grating arrays arranged along a set direction;

[0007] According to the following formula, calculate the spot radius of each viewpoint:

[0008] Spot radius = (pupil diameter / (number of viewpoints * 2 * distance from the human eye to the grating array) + 1.22 * wavelength / length of each grating unit in the grating array) * image distance;

[0009] According to the following formula, calculate the image point interval between the viewpoint and the adjacent viewpoint:

[0010] Length of each grating unit in the grating array * distance from the human eye to the image point / distance from the human eye to the grating array.

[0011] In an exemplary embodiment, before selecting one viewing point as the reference viewing point, the method further includes: controlling the display panel to sequentially display images of each viewing point. When displaying an image of each viewing point, the sub-pixels for displaying the current viewing point image display a white image, and the sub-pixels for displaying other viewing point images display a black image. On the light-emitting side of the display panel, the brightness values of the light at each test angle corresponding to the display of the current viewing point image are sequentially obtained to obtain the white light brightness curves of each viewing point.

[0012] In an exemplary embodiment, selecting one viewing point as the reference viewing point includes:

[0013] Among the white light brightness curves of each viewing point, select, within the main lobe viewing angle, the viewing point whose best viewing angle is equal to 0° or greater than 0° and closest to 0° as the reference viewing point.

[0014] In an exemplary embodiment, calculating the crosstalk value between other viewing points and the reference viewing point except the reference viewing point includes:

[0015] Within the main lobe viewing angle of the white light brightness curves of each viewing point, determine the brightness value corresponding to the reference viewing point and the other viewing point at the peak of the reference viewing point, and determine the distance between the peak of the other viewing point and the peak of the reference viewing point;

[0016] According to the determined brightness value corresponding to the reference viewing point and the other viewing point at the peak of the reference viewing point and the distance between the peak of the other viewing point and the peak of the reference viewing point, calculate the crosstalk value between the other viewing point and the reference viewing point.

[0017] In an exemplary embodiment, the crosstalk value between the other viewing point and the reference viewing point is proportional to the brightness value corresponding to the other viewing point at the peak of the reference viewing point, inversely proportional to the brightness value corresponding to the reference viewing point at the peak of the reference viewing point, and inversely proportional to the distance between the peak of the other viewing point and the peak of the reference viewing point.

[0018] In an exemplary embodiment, within the main lobe viewing angle of the white light brightness curves of each viewing point, the brightness value corresponding to the reference viewing point at the peak of the reference viewing point is Li, the brightness value corresponding to viewing point j at the peak of the reference viewing point is Lj, both i and j are between 1 and N, and i≠j, N is the number of viewing points of the display panel, and the distance between the peak of viewing point j and the peak of the reference viewing point is Dij;

[0019] The crosstalk value between viewing point j and the reference viewing point is: Lj / (Li*Dij).

[0020] In an exemplary embodiment, the other viewpoints include a viewpoint located to the left of the reference viewpoint and a viewpoint located to the right of the reference viewpoint.

[0021] In an exemplary embodiment, the method further includes:

[0022] Obtaining crosstalk weight values of other viewpoints except the reference viewpoint;

[0023] Calculating a total crosstalk value according to the crosstalk value between the other viewpoints and the reference viewpoint and the crosstalk weight value.

[0024] In an exemplary embodiment, the evaluating the naked-eye stereoscopic display viewpoint density according to the comparison of the image spot radii of the respective viewpoints with the size of the image point interval between the viewpoint and the adjacent viewpoint and the calculated crosstalk value between the other viewpoints and the reference viewpoint includes:

[0025] When the image spot radii of all the viewpoints are less than or equal to the image point interval between the viewpoint and the adjacent viewpoint, and the calculated total crosstalk value is less than a preset total crosstalk threshold, it is evaluated that the naked-eye stereoscopic display viewpoint density is excellent;

[0026] When one or more of the image spot radii of the respective viewpoints are greater than the image point interval between the viewpoint and the adjacent viewpoint, or the calculated total crosstalk value is greater than a preset total crosstalk threshold, it is evaluated that the naked-eye stereoscopic display viewpoint density is poor.

[0027] In an exemplary embodiment, the evaluating the naked-eye stereoscopic display viewpoint density according to the comparison of the image spot radii of the respective viewpoints with the size of the image point interval between the viewpoint and the adjacent viewpoint and the calculated crosstalk value between the other viewpoints and the reference viewpoint includes:

[0028] When the image spot radii of all the viewpoints are less than or equal to the image point interval between the viewpoint and the adjacent viewpoint, and the calculated crosstalk values between the other viewpoints and the reference viewpoint are all less than a preset crosstalk threshold, it is evaluated that the naked-eye stereoscopic display viewpoint density is excellent;

[0029] When one or more of the image spot radii of the respective viewpoints are greater than the image point interval between the viewpoint and the adjacent viewpoint, or one or more of the calculated crosstalk values between the other viewpoints and the reference viewpoint are greater than a preset crosstalk threshold, it is evaluated that the naked-eye stereoscopic display viewpoint density is poor.

[0030] An embodiment of the present disclosure further provides a processing device, including: a processor and a memory storing a computer program that can run on the processor, wherein when the processor executes the program, the steps of the method for evaluating the viewpoint density as described above are implemented.

[0031] An embodiment of the present disclosure also provides a system for evaluating the viewpoint density, including: a display module, an optical test device, and the processing device as described above, where: the display module includes a display panel and a grating array disposed on the light-emitting side of the display panel; the optical test device is configured to measure the brightness value of the light on the light-emitting side of the display panel.

[0032] An embodiment of the present disclosure also provides a computer-readable storage medium storing executable instructions, which, when executed by a processor, can implement the steps of the method for evaluating the viewpoint density as described in any one of the above.

[0033] The method, system, processing device, and computer storage medium for evaluating the viewpoint density provided by the embodiments of the present disclosure can evaluate the naked-eye stereoscopic display viewpoint density by comparing the spot radius of each viewpoint with the image point interval between the viewpoint and the adjacent viewpoint and calculating the crosstalk value between other viewpoints and the reference viewpoint. When designing a naked-eye 3D display device, an appropriate number of viewpoints can be selected, or it can be used to evaluate the advantages and disadvantages of the number of viewpoints of the current naked-eye 3D display device, so as to achieve the optimal design of the number of viewpoints of the naked-eye 3D display device and improve the naked-eye 3D display effect.

[0034] Other features and advantages of the present disclosure will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present disclosure. Other advantages of the present disclosure can be realized and obtained through the solutions described in the specification and the drawings. Description of the Drawings

[0035] The drawings are used to provide an understanding of the technical solutions of the present disclosure, and constitute a part of the specification. They are used together with the embodiments of the present disclosure to explain the technical solutions of the present disclosure, and do not constitute a limitation to the technical solutions of the present disclosure.

[0036] Figure 1 A flowchart of the display principle schematic diagram of the naked-eye 3D display device;

[0037] Figure 2 A flowchart of the method for evaluating the viewpoint density according to an embodiment of the present disclosure;

[0038] Figure 3 A schematic diagram of the sub-pixel arrangement on the display panel provided by an embodiment of the present disclosure;

[0039] Figure 4 A schematic diagram of the first group of sub-pixel arrangements corresponding to the display of the first viewpoint image;

[0040] Figure 5 A schematic diagram of the relative position between the luminance meter and the display panel when measuring the brightness value;

[0041] Figure 6 It is a superposition diagram of the brightness distribution curves corresponding to the respective viewpoint images of a 28-viewpoint image display module;

[0042] Figure 7 It is a superposition diagram of the brightness distribution curves corresponding to the respective viewpoint images of a 27-viewpoint image display module;

[0043] Figure 8 It is a superposition diagram of the brightness distribution curves corresponding to the respective viewpoint images of a 16-viewpoint image display module;

[0044] Figure 9 It is a schematic diagram of the simulation results of the first-order crosstalk of 28-viewpoint and 27-viewpoint image display modules;

[0045] Figure 10 It is a schematic diagram of the simulation results of the second-order crosstalk of 28-viewpoint and 27-viewpoint image display modules;

[0046] Figure 11 It is a schematic diagram of the simulation results of the third-order crosstalk of 28-viewpoint and 27-viewpoint image display modules;

[0047] Figure 12 It is a schematic diagram of the simulation results of the fourth-order crosstalk of 28-viewpoint and 27-viewpoint image display modules;

[0048] Figure 13 It is a schematic diagram of the simulation results of the fifth-order crosstalk of 28-viewpoint and 27-viewpoint image display modules;

[0049] Figure 14 It is a schematic diagram of the simulation results of the sixth-order crosstalk of 28-viewpoint and 27-viewpoint image display modules;

[0050] Figure 15 It is a schematic diagram of the structure of a processing device according to an embodiment of the present disclosure. Detailed implementation manners

[0051] The following further describes in detail the specific implementation manners of the present disclosure in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present disclosure, but are not used to limit the scope of the present disclosure. It should be noted that, without conflict, the embodiments in the present disclosure and the features in the embodiments can be arbitrarily combined with each other.

[0052] Currently, naked-eye 3D displays usually adopt the ultra-multi-viewpoint technology, that is, multiple viewpoints are set so that users can see the 3D display screen at multiple positions. For example Figure 1As shown in the figure, the display panel 10 is provided with a total of five viewpoints, namely viewpoint 1, viewpoint 2, viewpoint 3, viewpoint 4, and viewpoint 5. At this time, the grating 11 in front of the display panel 10 enables the two eyes of a user at a certain position to see the display pictures corresponding to two adjacent viewpoints among the five viewpoints. For example, the user's left eye can see the display picture corresponding to viewpoint 3, and the user's right eye can see the display picture corresponding to viewpoint 2. At this time, the user can see a 3D display picture.

[0053] With the improvement of the screen resolution, the number of viewpoints for 3D display is continuously increasing. The more viewpoints there are, the denser the viewpoints are, and the smoother the viewing is. On the contrary, there will be jumps. However, when the number of viewpoints is too large, the image points of adjacent viewpoint images are blurred, and the more viewpoints there are, the more crosstalk is introduced. Therefore, how to select an appropriate number of viewpoints, or how to evaluate the quality of the number of viewpoints of the current 3D display device, has become a problem to be solved in the field of naked-eye 3D technology and the manufacture of naked-eye 3D display devices.

[0054] As Figure 2 shown, the embodiment of the present disclosure provides a method for evaluating the viewpoint density, including step 10 to step 30.

[0055] Step 10: Obtain the number of viewpoints of the display panel;

[0056] In an exemplary embodiment, the display panel includes a plurality of sub-pixels arranged in a matrix. Taking a 65-inch 8K high-definition naked-eye 3D display screen as an example, 28-viewpoint image display modules, 27-viewpoint image display modules, and 16-viewpoint image display modules are respectively designed, and the viewpoint density is evaluated by the method for evaluating the viewpoint density of the embodiment of the present disclosure.

[0057] Taking the 28-viewpoint image display module as an example, as Figure 3 shown, the display panel includes 28 groups of sub-pixels respectively used for displaying 28 viewpoint images, the first group of sub-pixels 1, the second group of sub-pixels 2, the third group of sub-pixels 3,..., up to the 28th group of sub-pixels 28. The arrangement manner of each sub-pixel is not limited to the Figure 3 arrangement manner shown.

[0058] Step 20: Compare the spot radius of each viewpoint with the pixel interval between the viewpoint and the adjacent viewpoint, and select a viewpoint as the reference viewpoint, and calculate the crosstalk value between other viewpoints except the reference viewpoint and the reference viewpoint;

[0059] In an exemplary embodiment, when comparing the spot radius of each viewing point with the image point interval between the viewing point and the adjacent viewing point, from viewing point 1 to viewing point N, the spot radius of each viewing point is compared one by one with the image point interval between the viewing point and the adjacent viewing point. Exemplarily, for viewing point 1, compare the spot radius of viewing point 1 with the image point interval between viewing point 1 and viewing point 2; for viewing point 2, compare the spot radius of viewing point 2 with the image point interval between viewing point 1 and viewing point 2, and compare the spot radius of viewing point 2 with the image point interval between viewing point 2 and viewing point 3; for viewing point 3, compare the spot radius of viewing point 3 with the image point interval between viewing point 2 and viewing point 3, and compare the spot radius of viewing point 3 with the image point interval between viewing point 3 and viewing point 4;...; for viewing point (N - 1), compare the spot radius of viewing point (N - 1) with the image point interval between viewing point (N - 2) and viewing point (N - 1), and compare the spot radius of viewing point (N - 1) with the image point interval between viewing point (N - 1) and viewing point N; for viewing point N, compare the spot radius of viewing point N with the image point interval between viewing point (N - 1) and viewing point N, where N is the number of viewing points.

[0060] In an exemplary embodiment, the light-emitting side of the display panel includes a plurality of grating arrays arranged along a set direction;

[0061] According to the following formula, calculate the spot radius of each viewing point:

[0062] Spot radius = (Pupil diameter / (Number of viewing points * 2 * Distance from the human eye to the grating array) + 1.22 * Wavelength / Length of each grating unit in the grating array) * Image distance;

[0063] According to the following formula, calculate the image point interval between the viewing point and the adjacent viewing point:

[0064] Length of each grating unit in the grating array * Distance from the human eye to the image point / Distance from the human eye to the grating array.

[0065] In an exemplary embodiment, the grating array can be a grating structure such as a lenticular grating array or a parallax barrier grating array.

[0066] When the spot radius of a viewing point is less than or equal to the image point interval between the viewing point and the adjacent viewing point, the spot of the viewing point is clear. On the contrary, when the spot radius of a viewing point is greater than the image point interval between the viewing point and the adjacent viewing point, the spot of the viewing point is unclear.

[0067] When the spot radii of all viewing points are less than or equal to the image point intervals between the viewing points and the adjacent viewing points, the spots of all viewing points are clear; when one or more of the spot radii of the viewing points are greater than the image point intervals between the viewing points and the adjacent viewing points, then there is one or more viewing points whose spots are unclear.

[0068] Due to parallax, the image points seen by the human eye can be presented in front of the screen or behind the screen. Therefore, the distance from the human eye to the image point can be less than or equal to the distance from the human eye to the screen, or greater than the distance from the human eye to the screen.

[0069] In one exemplary embodiment, while outputting the 3D view, the position data of the image points seen by the human eye is directly obtained through a processor or a control system.

[0070] In one exemplary embodiment, before selecting a viewpoint as the reference viewpoint, the method further includes:

[0071] Controlling the display panel to sequentially display the images of each viewpoint. When displaying the image of each viewpoint, the sub-pixels for displaying the current viewpoint image display white images, and the sub-pixels for displaying the images of other viewpoints display black images. At the light-emitting side of the display panel, the brightness values of the light at each test angle corresponding to the display of the current viewpoint image are sequentially obtained to obtain the white light brightness curves of each viewpoint.

[0072] In one exemplary embodiment, each viewpoint image corresponds to a part of the sub-pixels on the display panel, and the images of each viewpoint correspond to all the sub-pixels on the display panel. When controlling the display panel to display an image of a certain viewpoint, the sub-pixels corresponding to the current viewpoint image display white images, and the other sub-pixels display black images.

[0073] Controlling the display panel to display the images of each viewpoint respectively. When displaying the image of a certain viewpoint, the sub-pixels corresponding to the current viewpoint image display white images, and the sub-pixels corresponding to the images of other viewpoints display black images. For example: Refer to Figure 4 , when displaying the image of the first viewpoint, controlling the first group of sub-pixels 1 of the display panel to display white images, and the other sub-pixels to display black images;

[0074] Similarly, when displaying the image of the second viewpoint, controlling the second group of sub-pixels 2 of the display panel to display white images, and the other sub-pixels to display black images;

[0075] When displaying the image of the third viewpoint, controlling the third group of sub-pixels 3 of the display panel to display white images, and the other sub-pixels to display black images;

[0076] When displaying the image of the fourth viewpoint, controlling the fourth group of sub-pixels 4 of the display panel to display white images, and the other sub-pixels to display black images;

[0077] ……

[0078] When displaying the image of the 28th viewpoint, controlling the 28th group of sub-pixels 28 of the display panel to display white images, and the other sub-pixels to display black images.

[0079] In the actual implementation process, for each viewpoint image, an optical test device is used to sequentially measure the brightness values of light at different test angles α1, α2, …, αm on the light-emitting side of the display panel. Exemplarily, the optical test device can be a luminance meter, and the luminance values of light at different test angles are obtained through the luminance meter. A step interval can be set to test the luminance values of light at multiple test angles. For example, the luminance values of light are tested once every 0.5 radian angle.

[0080] In an exemplary embodiment, in order to improve the accuracy of evaluating the quality of the naked-eye stereoscopic display viewpoint density, the luminance meter moves within the same plane to measure the luminance values of light at different test angles on the same plane.

[0081] In an exemplary embodiment, since a person's left and right eyes are on the same horizontal line, relative to the stationary display panel, the luminance meter obtaining the luminance values of light in different test angle directions in the same plane can improve the accuracy of evaluating the quality of the naked-eye stereoscopic display viewpoint density. In the specific implementation process, the luminance meter can be placed at a position on the light-emitting side of the display panel at a constant distance from the ground, and the luminance meter can move on the same horizontal plane to test the luminance values of each viewpoint image at multiple test angles.

[0082] In an exemplary embodiment, in order to further improve the accuracy of evaluating the quality of the naked-eye stereoscopic display viewpoint density, the luminance meter tests the luminance values of each viewpoint image at multiple test angles at multiple test angles on an arc centered on the center of the display panel on the light-emitting side of the display panel, with a set viewing distance as the radius and located on the same horizontal plane.

[0083] Theoretically, since there will be a certain loss during the propagation of light, there will be a certain deviation in the luminance values of light at different positions in the same test angle direction. The luminance value of light at a position farther from the light source is smaller, and the luminance value of light at a position closer to the light is larger. In the present disclosure, the luminance meter measures the luminance values of light at positions equidistant from the center of the display screen in different test angle directions, which can improve the accuracy of evaluating the quality of the naked-eye stereoscopic display viewpoint density.

[0084] At different positions on the arc, different test angles correspond. In order to further improve the accuracy of evaluating the quality of the naked-eye stereoscopic display viewpoint density, the luminance values of light can be measured at the same interval angle. For example, as Figure 5As shown, taking the measurement position 0° corresponding to the center of the display panel as a reference, within the stereoscopic viewing angle range, move the luminance meter counterclockwise. Measure the luminance value of the emitted light at positions corresponding to radian angles of 5°, 10°, 15°, 20°, etc. Then, taking the measurement position corresponding to the center of the display panel as 0° as a reference, move the luminance meter clockwise. Measure the luminance value of the emitted light at positions corresponding to radian angles of -5°, -10°, -15°, -20°, etc. Measuring the luminance value every 5° is only for illustration. In the actual implementation process, the luminance value can be measured at intervals of smaller radian values. For example, measure the luminance value with a step size of 0.5 or 1 degree. Save the luminance values obtained at different test angles in the luminance meter.

[0085] As Figure 5 shown, when measuring the luminance value, the relative position between the luminance meter 20 and the display panel 10 is: the luminance meter 20 moves at different positions on the circular arc with the center O (or also called the center) of the display panel 10 as the center and the optimal viewing distance R for the viewer to view the image as the radius to measure the luminance of the light. For example, luminance values can be measured at intervals of 0.5° radian angle in the range from 30° to -30° in sequence, and 121 luminance values are measured at 121 test angles for each viewpoint image in sequence.

[0086] According to the luminance values Yji (j = 1, 2, 3,..., 28; i = 1, 2, 3,..., 121) obtained in the above steps and the corresponding relationship between each luminance value Yji and the test angle, generate a white light luminance distribution curve showing the change of luminance with the test angle.

[0087] Exemplarily, according to the corresponding relationship between the luminance values Y1i corresponding to the first viewpoint image obtained by the luminance meter and the test angles α1, α2, α3,..., α121, generate a white light luminance distribution curve of the first viewpoint image at different test angles, where Y1i is the luminance value of the light at the i-th test angle when the first viewpoint image is displayed;

[0088] According to the corresponding relationship between the luminance values Y2i corresponding to the second viewpoint image obtained by the luminance meter and the test angles α1, α2, α3,..., α121, generate a white light luminance distribution curve of the second viewpoint image at different test angles, where Y2i is the luminance value of the light at the i-th test angle when the second viewpoint image is displayed;

[0089] According to the corresponding relationship between the luminance values Y3i corresponding to the third viewpoint image obtained by the luminance meter and the test angles α1, α2, α3,..., α121, generate a white light luminance distribution curve of the third viewpoint image at different test angles, where Y3i is the luminance value of the light at the i-th test angle when the third viewpoint image is displayed;

[0090] ……

[0091] According to the corresponding relationship between the brightness Y28i of the 28th view point image obtained by the luminance meter and the test angles α1, α2, α3, ……, α121, generate the white light brightness distribution curve of the 28th view point image at different test angles, where Y28i is the brightness value of the light at the ith test angle when the 28th view point image is displayed.

[0092] In an exemplary embodiment, in order to more conveniently obtain the brightness peak in the brightness values corresponding to each viewing area, respectively obtain the brightness distribution curve of the brightness value corresponding to each view point image with respect to the test angle; superimpose the brightness distribution curves corresponding to each view point image (that is, place the brightness distribution curves corresponding to each view point image in the same rectangular coordinate system), and obtain multiple brightness values corresponding to each view point image in the superimposed brightness distribution curve. There are multiple brightness peaks in these brightness values, and each brightness peak corresponds to a viewing area at the light-emitting side of the display panel.

[0093] Figure 6 It is a superimposed graph of the brightness distribution curves corresponding to each view point image of the 28-view point image display module. Figure 7 It is a superimposed graph of the brightness distribution curves corresponding to each view point image of the 27-view point image display module. Figure 8 It is a superimposed graph of the brightness distribution curves corresponding to each view point image of the 16-view point image display module. Each brightness peak corresponds to the best viewing angle on the light-emitting side of the display panel, that is, each brightness peak is the brightness value obtained at the best viewing angle on the light-emitting side (also called the viewing area). The best different viewing angles described in the present disclosure correspond one-to-one to different viewing areas on the light-emitting side of the display panel.

[0094] In an exemplary embodiment, select a view point as the reference view point, including:

[0095] Among the white light brightness curves of each view point, select the view point whose best viewing angle (that is, the test angle corresponding to the brightness peak) is equal to 0° or greater than 0° and closest to 0° within the main lobe viewing angle as the reference view point. In the embodiments of the present disclosure, the test angle is defined as the angle between the line connecting the test point to the center point of the screen and the perpendicular line drawn from the center point of the display screen. Exemplarily, as Figure 5 shown, the test point A is on the perpendicular line drawn from the center point O of the display screen, that is, the test angle of the test point A is 0°, and the test angle θ of the test point B is the angle between the line segment OB and the line segment OA, that is, 10°.

[0096] Each viewing point includes a main lobe viewing angle and a side lobe viewing angle. The angle at which the light emitted by the light-emitting element exits after hitting the corresponding microlens is the main lobe viewing angle, and the angle at which the light emitted by the light-emitting element exits after hitting the microlens adjacent to the corresponding microlens is the side lobe viewing angle. Among them, the 3D effect is the best in the main lobe viewing angle region. There may be a dark area between the main lobe viewing angle and the side lobe viewing angle.

[0097] The main reason for the side lobe viewing angle is that the light emitted by the light-emitting element is approximately 180°, the aperture of the microlens corresponding to the light-emitting element is limited, and the distance between the light-emitting element and the microlens is relatively far. Therefore, the light emitted by the light-emitting element will hit the microlens adjacent to the corresponding microlens, thus forming the side lobe viewing angle.

[0098] In one exemplary embodiment, calculating the crosstalk value between other viewing points and a reference viewing point except the reference viewing point includes:

[0099] Within the main lobe viewing angle of the white light brightness curve of each viewing point, determine the brightness value corresponding to the reference viewing point and other viewing points at the peak of the reference viewing point, and determine the distance between the peak of other viewing points and the peak of the reference viewing point;

[0100] According to the determined brightness value corresponding to the reference viewing point and other viewing points at the peak of the reference viewing point and the distance between the peak of other viewing points and the peak of the reference viewing point, calculate the crosstalk value between other viewing points and the reference viewing point.

[0101] In one exemplary embodiment, the crosstalk value between other viewing points and the reference viewing point is proportional to the brightness value corresponding to other viewing points at the peak of the reference viewing point, inversely proportional to the brightness value corresponding to the reference viewing point at the peak of the reference viewing point, and inversely proportional to the distance between the peak of other viewing points and the peak of the reference viewing point.

[0102] In one exemplary embodiment, within the main lobe viewing angle, the brightness value corresponding to the reference viewing point at the peak of the reference viewing point is Li, the brightness value corresponding to viewing point j at the peak of the reference viewing point is Lj, both i and j are between 1 and N, and i≠j, N is the number of viewing points of the display panel, and the distance between the peak of viewing point j and the peak of the reference viewing point is Dij;

[0103] The crosstalk value between viewing point j and the reference viewing point is: Lj / (Li*Dij).

[0104] The embodiments of the present disclosure provide a calculation method for the crosstalk value between viewing point j and the reference viewing point. This calculation method is only an example, and the embodiments of the present disclosure do not limit how to specifically calculate the crosstalk value between viewing point j and the reference viewing point.

[0105] Taking 28 viewing points as an example, such as Figure 6As shown, the test angle corresponding to the peak of viewing point 16 is greater than 0° and closest to 0°. Therefore, viewing point 16 is selected as the reference viewing point. First, calculate the crosstalk of the viewing points on the right side of viewing point 16 with respect to viewing point 16. Since the main lobe viewing angles of viewing points 17, 18, 19, 20, 21, and 22 overlap with the main lobe viewing angle of viewing point 16, viewing points 17, 18, 19, 20, 21, and 22 all have crosstalk with viewing point 16.

[0106] Within the main lobe viewing angle, record the brightness value at the peak of viewing point 16 as L16, and record the brightness values of viewing points 17, 18, 19, 20, 21, and 22 at the peak of viewing point 16 as L17, L18, L19, L20, L21, and L22 respectively. Also, at the position of the optimal viewing distance, record the distances D1, D2, D3, D4, D5, and D6 between the peaks of viewing points 17, 18, 19, 20, 21, and 22 and the peak of viewing point 16. The first-level crosstalk is L17 / (L16*D1), the second-level crosstalk is L18 / (L16*D2), the third-level crosstalk is L19 / (L16*D3), the fourth-level crosstalk is L20 / (L16*D4), the fifth-level crosstalk is L21 / (L16*D5), and the sixth-level crosstalk is L22 / (L16*D6). Among them, the first-level crosstalk is the crosstalk of the viewing point directly adjacent to the reference viewing point with respect to the reference viewing point, the second-level crosstalk is the crosstalk of the viewing point with one viewing point interval from the reference viewing point with respect to the reference viewing point, the third-level crosstalk is the crosstalk of the viewing point with two viewing point intervals from the reference viewing point with respect to the reference viewing point, the fourth-level crosstalk is the crosstalk of the viewing point with three viewing point intervals from the reference viewing point with respect to the reference viewing point, the fifth-level crosstalk is the crosstalk of the viewing point with four viewing point intervals from the reference viewing point with respect to the reference viewing point, and the sixth-level crosstalk is the crosstalk of the viewing point with five viewing point intervals from the reference viewing point with respect to the reference viewing point.

[0107] Similarly, calculate the crosstalk of the viewing points on the left side of viewing point 16 with respect to viewing point 16.

[0108] Similarly, the image display module designed with 27 viewing points can also be calculated according to this method to obtain the crosstalk of the viewing points on the left and right sides of the reference viewing point with respect to the reference viewing point.

[0109] Step 30: Evaluate the naked-eye stereoscopic display viewing point density according to the comparison of the speckle radii of each viewing point with the image point intervals between the viewing point and adjacent viewing points and the calculated crosstalk values between other viewing points and the reference viewing point.

[0110] As Figures 6 to 8As shown, within the main lobe view angle, the spacing between adjacent viewpoints is very small. Among them, the spacing between adjacent viewpoints of the 28th viewpoint is 0.3°, the spacing between adjacent viewpoints of the 27th viewpoint is 0.304°, and the spacing between adjacent viewpoints of the 16th viewpoint is 0.4625°. The smaller the viewpoint spacing, the smoother the viewing and the closer it is to the situation of countless viewpoints in the real world. However, adjacent image patches must be clearly distinguishable. The condition for forming a clear image is: r ≤ d (image patch radius ≤ image point interval);

[0111] The formula is given as follows:

[0112] (Pupil diameter / (number of viewpoints * 2 * distance from the human eye to the grating array) + 1.22 * wavelength / length of each grating unit in the grating array) * image distance ≤ length of each grating unit in the grating array * distance from the human eye to the image point / distance from the human eye to the grating array.

[0113] It can be obtained from the formula that the 28th and 27th viewpoints with the minimum viewpoint intervals of 0.3° and 0.304° meet the conditions for clear imaging and are preferred designs.

[0114] The crosstalk values of each level of the 28th and 27th viewpoints are calculated respectively. After comparison, the crosstalk values of the six levels of the 28th viewpoint are all smaller than those of the 27th viewpoint. Therefore, the 28th viewpoint has a better effect than the 27th viewpoint.

[0115] Through simulation with the optical software (LightTools), as Figures 9 to 14 shown, the simulation results of the six-level crosstalk of the 28th and 27th viewpoints are consistent with the calculation results of the method for evaluating the viewpoint density in the embodiments of the present disclosure. Among them, Figure 11 the 16 viewpoints_S1 and 16 viewpoints_S2 in

[0116] In an exemplary embodiment, the method further includes:

[0117] Obtaining the crosstalk weight values of other viewpoints except the reference viewpoint;

[0118] Calculating the total crosstalk value according to the crosstalk value and the crosstalk weight value between other viewpoints and the reference viewpoint.

[0119] Exemplarily, still taking the crosstalk of the viewpoints on the right side of the 16th viewpoint in the above-mentioned 28 viewpoints with respect to the 16th viewpoint as an example, assuming that the crosstalk weight value of the first-level crosstalk is a1, the crosstalk weight value of the second-level crosstalk is a2, the crosstalk weight value of the third-level crosstalk is a3, the crosstalk weight value of the fourth-level crosstalk is a4, the crosstalk weight value of the fifth-level crosstalk is a5, and the crosstalk weight value of the sixth-level crosstalk is a6, where a6 ≥ a5 ≥ a4 ≥ a3 ≥ a2 ≥ a1, and a1 + a2 + a3 + a4 + a5 + a6 = 1, then:

[0120] Total crosstalk value on the right side = primary crosstalk * a1 + secondary crosstalk * a2 + tertiary crosstalk * a3 + quaternary crosstalk * a4 + quinary crosstalk * a5 + senary crosstalk * a6;

[0121] Similarly, the total crosstalk value on the left side is obtained;

[0122] Preferably, the total crosstalk value is calculated: Total crosstalk value = b1 * total crosstalk value on the right side + b2 * total crosstalk value on the left side. Wherein, b1 is the crosstalk weight value of the total crosstalk value on the right side, b2 is the crosstalk weight value of the total crosstalk value on the left side, and b1 + b2 = 1. Exemplarily, b1 = 0.5 and b2 = 0.5.

[0123] In an exemplary embodiment, according to the comparison of the spot radii of each view point with the image point interval between the view point and the adjacent view point, and the calculated crosstalk value between other view points and the reference view point, the evaluation of the naked-eye stereoscopic display view point density includes:

[0124] When the spot radii of each view point are all less than or equal to the image point interval between the view point and the adjacent view point, and the calculated total crosstalk value is less than the preset total crosstalk threshold, the naked-eye stereoscopic display view point density is evaluated as excellent;

[0125] When one or more of the spot radii of each view point are greater than the image point interval between the view point and the adjacent view point, or the calculated total crosstalk value is greater than the preset total crosstalk threshold, the naked-eye stereoscopic display view point density is evaluated as poor.

[0126] In an exemplary embodiment, according to the comparison of the spot radii of each view point with the image point interval between the view point and the adjacent view point, and the calculated crosstalk value between other view points and the reference view point, the evaluation of the naked-eye stereoscopic display view point density includes:

[0127] When the spot radii of each view point are all less than or equal to the image point interval between the view point and the adjacent view point, and the calculated crosstalk value between other view points and the reference view point is all less than the preset crosstalk threshold, the naked-eye stereoscopic display view point density is evaluated as excellent;

[0128] When one or more of the spot radii of each view point are greater than the image point interval between the view point and the adjacent view point, or one or more of the calculated crosstalk values between other view points and the reference view point are greater than the preset crosstalk threshold, the naked-eye stereoscopic display view point density is evaluated as poor.

[0129] In an exemplary embodiment, the preset crosstalk threshold can be set corresponding to each level of crosstalk as described above.

[0130] An embodiment of the present disclosure further provides a processing device, which may include a processor and a memory storing a computer program that can run on the processor. When the processor executes the computer program, the steps of the method for evaluating the viewpoint density as described in any one of the previous items in the present disclosure are implemented.

[0131] As Figure 15 shown, in one example, the processing device 1500 may include: a processor 1510, a memory 1520, a bus system 1530, and a transceiver 1540. Among them, the processor 1510, the memory 1520, and the transceiver 1540 are connected through the bus system 1530. The memory 1520 is used to store instructions, and the processor 1510 is used to execute the instructions stored in the memory 1520 to control the transceiver 1540 to send signals. Specifically, the transceiver 1540 can obtain the brightness values of the light corresponding to different test angles collected from an optical test device (such as a luminance meter) under the control of the processor 1510, and after comparing the spot radius of each viewpoint with the size of the image point interval between the viewpoint and the adjacent viewpoint and calculating the crosstalk value between other viewpoints and the reference viewpoint, send a notification to other devices through the transceiver.

[0132] It should be understood that the processor 1510 may be a central processing unit (CPU), and the processor 1510 may also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0133] The memory 1520 may include a read-only memory and a random access memory, and provide instructions and data to the processor 1510. A part of the memory 1520 may also include a non-volatile random access memory. For example, the memory 1520 may also store information about the device type.

[0134] In addition to including a data bus, the bus system 1530 may also include a power bus, a control bus, a status signal bus, etc. However, for the sake of clarity, in Figure 15 all kinds of buses are labeled as the bus system 1530.

[0135] In the implementation process, the processing performed by the processing device can be completed by the integrated logic circuit of the hardware in the processor 1510 or the instructions in the form of software. That is, the method steps of the embodiments of the present disclosure can be embodied as being executed and completed by the hardware processor, or by a combination of the hardware and software modules in the processor. The software module can be located in a storage medium such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. This storage medium is located in the memory 1520, and the processor 1510 reads the information in the memory 1520 and combines its hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.

[0136] The embodiments of the present disclosure further provide a system for evaluating the viewpoint density, including a display module, an optical test device, and a processing device. The processing device can be the processing device 1500 as described above. The display module includes a display panel and a grating array disposed on the light-emitting side of the display panel, and is configured to sequentially display images of each viewpoint; the optical test device is configured to measure the brightness value of the light on the light-emitting side of the display panel.

[0137] The embodiments of the present disclosure further provide a computer-readable storage medium. The computer-readable storage medium stores executable instructions, and when the executable instructions are executed by a processor, the method for evaluating the viewpoint density provided in any one of the above embodiments of the present disclosure can be implemented. The method for evaluating the viewpoint density can be used to select an appropriate number of viewpoints when designing a naked-eye 3D display device, or to evaluate the advantages and disadvantages of the number of viewpoints of the current naked-eye 3D display device, so as to realize the optimal design of the number of viewpoints of the naked-eye 3D display device and improve the naked-eye 3D display effect. The method for driving the system for evaluating the viewpoint density to perform viewpoint density evaluation by executing the executable instructions is basically the same as the method for evaluating the viewpoint density provided in the above embodiments of the present disclosure, and will not be elaborated here.

[0138] In the description of the embodiments of the present disclosure, it should be understood that the orientation or positional relationship indicated by the terms "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present disclosure.

[0139] In the description of the embodiments of the present disclosure, unless otherwise clearly defined and limited, the terms "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the meanings of the above terms in the present disclosure can be understood accordingly.

[0140] Those of ordinary skill in the art can understand that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, and their appropriate combinations. In the hardware implementation, the division of the functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, a physical component can have multiple functions, or a function or step can be executed by several physical components in cooperation. Some or all of the components can be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassette, tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, the communication medium generally includes computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

[0141] Although the embodiments disclosed in the present disclosure are as above, the content described above is only an embodiment for facilitating the understanding of the present disclosure, and is not intended to limit the present disclosure. Any person skilled in the art within the scope of the present disclosure can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present disclosure. However, the protection scope of the present disclosure shall still be subject to the scope defined by the appended claims.

Claims

1. A method for evaluating view point density, characterized in that, Including: Obtaining the number of viewpoints of a display panel, where the viewpoints of the display panel are positions that enable a user to view a 3D display image. The display panel includes a plurality of sub-pixels arranged in a matrix, and the light-emitting side of the display panel includes a plurality of grating arrays arranged along a set direction; Comparing the spot radius of each viewpoint with the image point interval between the viewpoint and an adjacent viewpoint, and selecting one viewpoint as a reference viewpoint, and calculating the crosstalk value between other viewpoints except the reference viewpoint and the reference viewpoint; Evaluating the naked-eye stereoscopic display viewpoint density based on the comparison results of the spot radius of each viewpoint with the image point interval between the viewpoint and an adjacent viewpoint and the calculated crosstalk value between other viewpoints and the reference viewpoint.

2. The method according to claim 1, wherein Calculating the spot radius of each viewpoint according to the following formula: Spot radius = (pupil diameter / (number of viewpoints * 2 * distance from the human eye to the grating array) + 1.22 * wavelength / length of each grating unit in the grating array) * image distance; Calculating the image point interval between the viewpoint and an adjacent viewpoint according to the following formula: Length of each grating unit in the grating array * distance from the human eye to the image point / distance from the human eye to the grating array.

3. The method according to claim 1, characterized in that, Before selecting one viewpoint as a reference viewpoint, the method further includes: Controlling the display panel to sequentially display the images of each viewpoint. When displaying the image of each viewpoint, the sub-pixels for displaying the current viewpoint image display white images, and the sub-pixels for displaying the images of other viewpoints display black images. At the light-emitting side of the display panel, sequentially obtaining the brightness values of the light at each test angle corresponding to the display of the current viewpoint image, and obtaining the white light brightness curve of each viewpoint.

4. The method according to claim 3, characterized in that, The selection of one viewpoint as a reference viewpoint includes: Among the white light brightness curves of each viewpoint, selecting the viewpoint with the best viewing angle equal to 0° or greater than 0° and closest to 0° within the main lobe view angle as the reference viewpoint.

5. The method according to claim 3, characterized in that, The calculation of the crosstalk value between other viewpoints except the reference viewpoint and the reference viewpoint includes: Within the main lobe view angle of the white light brightness curves of each viewpoint, determining the brightness value corresponding to the wave peak of the reference viewpoint and the other viewpoint at the wave peak of the reference viewpoint, and determining the distance between the wave peak of the other viewpoint and the wave peak of the reference viewpoint; Calculating the crosstalk value between the other viewpoint and the reference viewpoint according to the determined brightness value corresponding to the wave peak of the reference viewpoint and the other viewpoint at the wave peak of the reference viewpoint and the distance between the wave peak of the other viewpoint and the wave peak of the reference viewpoint.

6. The method according to claim 5, wherein The crosstalk value between the other viewpoint and the reference viewpoint is directly proportional to the brightness value corresponding to the wave peak of the other viewpoint at the wave peak of the reference viewpoint, inversely proportional to the brightness value corresponding to the wave peak of the reference viewpoint at the wave peak of the reference viewpoint, and inversely proportional to the distance between the wave peak of the other viewpoint and the wave peak of the reference viewpoint.

7. The method according to claim 6, wherein Within the main lobe viewing angle of the white light brightness curve of each viewing point, the brightness value corresponding to the reference viewing point at the peak of the reference viewing point is Li, the brightness value corresponding to the viewing point j at the peak of the reference viewing point is Lj, both i and j are between 1 and N, and i≠j, N is the number of viewing points of the display panel, and the distance between the peak of the viewing point j and the peak of the reference viewing point is Dij; The crosstalk value between the viewing point j and the reference viewing point is: Lj / (Li*Dij).

8. The method according to claim 5, wherein The other viewing points include the viewing points located on the left side of the reference viewing point and the viewing points located on the right side of the reference viewing point.

9. The method according to claim 1, characterized in that, The method further includes: Obtaining the crosstalk weight values of other viewing points except the reference viewing point; Calculating the total crosstalk value according to the crosstalk value between other viewing points and the reference viewing point and the crosstalk weight value.

10. The method according to claim 9, wherein The evaluating the naked-eye stereoscopic display viewing point density according to the comparison of the spot radii of each viewing point with the size of the image point interval between the viewing point and the adjacent viewing point and the calculated crosstalk value between other viewing points and the reference viewing point includes: When the spot radii of each viewing point are all less than or equal to the image point interval between the viewing point and the adjacent viewing point, and the calculated total crosstalk value is less than a preset total crosstalk threshold, it is evaluated that the naked-eye stereoscopic display viewing point density is excellent; When one or more of the spot radii of each viewing point are greater than the image point interval between the viewing point and the adjacent viewing point, or the calculated total crosstalk value is greater than a preset total crosstalk threshold, it is evaluated that the naked-eye stereoscopic display viewing point density is poor.

11. The method according to claim 1, wherein The evaluating the naked-eye stereoscopic display viewing point density according to the comparison of the spot radii of each viewing point with the size of the image point interval between the viewing point and the adjacent viewing point and the calculated crosstalk value between other viewing points and the reference viewing point includes: When the spot radii of each viewing point are all less than or equal to the image point interval between the viewing point and the adjacent viewing point, and the calculated crosstalk values between other viewing points and the reference viewing point are all less than a preset crosstalk threshold, it is evaluated that the naked-eye stereoscopic display viewing point density is excellent; When one or more of the spot radii of each viewing point are greater than the image point interval between the viewing point and the adjacent viewing point, or one or more of the calculated crosstalk values between other viewing points and the reference viewing point are greater than a preset crosstalk threshold, it is evaluated that the naked-eye stereoscopic display viewing point density is poor.

12. A processing device, characterized in that, Including: A processor and a memory storing a computer program that can run on the processor, wherein when the processor executes the computer program, the steps of the method for evaluating the viewing point density according to any one of claims 1 to 11 are implemented.

13. A system for evaluating viewpoint density, characterized in that, Including: A display module, an optical test device, and a processing device according to claim 12, wherein: The display module includes a display panel and a grating array disposed on the light-emitting side of the display panel; The optical test device is used to measure the brightness value of the light on the light-emitting side of the display panel.

14. A computer storage medium, characterized in that, The computer storage medium stores computer-executable instructions, and the computer-executable instructions are used to execute the steps of the method for evaluating the viewing point density according to any one of claims 1 to 11.

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