Display device and display method

Abstract

The embodiments of the present application provide a display device and a display method. In the display device provided by the embodiments of the present application, a first three-dimensional stereoscopic image point is formed on the central depth plane when the backlight module is in a first operating mode, and a second three-dimensional stereoscopic image point is formed on the central depth plane when the backlight module is in a second operating mode. The positions of the first three-dimensional stereoscopic image point and the second three-dimensional stereoscopic image point do not overlap in the central depth plane, and the switching frequency between the first operating mode and the second operating mode is greater than the frequency required for visual persistence, so that a viewer can view the first three-dimensional stereoscopic image point and the second three-dimensional stereoscopic image point, thereby multiplying the number of three-dimensional stereoscopic image points of the three-dimensional image viewed by the viewer, thereby improving the resolution of the three-dimensional image, reducing the graininess of the three-dimensional image, and ensuring the viewer's viewing experience.

Description

Technical Field

[0001] The present application relates to the field of display technology, and more specifically, to a display device and a display method. Background Art

[0002] With the development of display technology, 3D display devices are increasingly favored by the market. Currently, 3D display devices based on integrated stereoscopic display technology have become one of the key research directions.

[0003] However, existing 3D display devices based on integrated stereoscopic display technology have a problem of low resolution, which results in obvious graininess in the displayed 3D images, affecting the viewing experience of viewers. Summary of the Invention

[0004] In view of the shortcomings of the existing methods, the present application proposes a display device and a display method to solve the technical problem of obvious graininess of 3D images displayed by 3D display devices in the prior art.

[0005] In a first aspect, an embodiment of the present application provides a display device, comprising:

[0006] Backlight module;

[0007] A display panel is located on one side of the backlight module, and the display panel includes at least two display units;

[0008] The optical modulation module is located on a side of the display panel away from the backlight module; the central depth plane of the display device is located on a side of the optical modulation module away from the display panel; the optical modulation module includes at least two lens units;

[0009] The backlight module alternately switches between a first operating mode and a second operating mode, and the switching frequency between the first operating mode and the second operating mode is greater than the frequency required for visual persistence; in the first operating mode, the display image of each display unit forms a first reconstructed image point on the central depth plane after passing through a lens unit, and at least two first reconstructed image points form a first three-dimensional stereoscopic image point; in the second operating mode, the display image of each display unit forms a second reconstructed image point on the central depth plane after passing through a lens unit, and at least two second reconstructed image points form a second three-dimensional stereoscopic image point; the positions of the first three-dimensional stereoscopic image point and the second three-dimensional stereoscopic image point in the central depth plane do not overlap.

[0010] In a second aspect, an embodiment of the present application provides a display method, including:

[0011] Controlling the backlight module to switch to a first operating mode to form at least one first three-dimensional stereoscopic image point on a central depth plane;

[0012] Controlling the backlight module to switch to a second operating mode to form at least one second three-dimensional image point in the central depth plane, where the second three-dimensional image point is adjacent to a position where the first three-dimensional image point is located;

[0013] The switching frequency between the first and second operating modes is controlled to be greater than a set frequency, so that a viewer at a designed observation position can simultaneously view a 3D image formed by the first and second 3D image points.

[0014] The beneficial technical effects brought about by the technical solutions provided in the embodiments of the present application include:

[0015] In the display device provided in the embodiment of the present application, a first three-dimensional stereoscopic image point is formed on the central depth plane when the backlight module is in the first operating mode, and a second three-dimensional stereoscopic image point is formed on the central depth plane when the backlight module is in the second operating mode. The positions of the first three-dimensional stereoscopic image point and the second three-dimensional stereoscopic image point do not overlap in the central depth plane, and the switching frequency between the first operating mode and the second operating mode is greater than the frequency required for visual residual, so that the viewer can view the first three-dimensional stereoscopic image point and the second three-dimensional stereoscopic image point, thereby multiplying the number of three-dimensional stereoscopic image points of the three-dimensional stereoscopic image viewed by the viewer, thereby improving the resolution of the three-dimensional stereoscopic image, reducing the graininess of the three-dimensional stereoscopic image, and ensuring the viewer's viewing experience.

[0016] Additional aspects and advantages of the present application will be given in part in the following description, which will become apparent from the following description, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0018] Figure 1 A schematic diagram of a backlight module in a display device provided in an embodiment of the present application in a first working state;

[0019] Figure 2 Provided in the embodiments of this application Figure 1 A schematic diagram of the backlight module in the display device shown in the second working state;

[0020] Figure 3 Provided in the embodiments of this application Figure 1 Schematic diagram of the optical path of the display device shown.

[0021] Description of reference numerals:

[0022] 10- backlight module;

[0023] 11-light guide plate; 12-beam splitter prism; 13-first light emitting component; 14-second light emitting component;

[0024] 20-display panel;

[0025] 21-display unit;

[0026] 30-optical modulation module;

[0027] 31- lens unit;

[0028] 40-center depth plane;

[0029] 41-first three-dimensional image point; 42-second three-dimensional image point;

[0030] 50- Design observation position;

[0031] 60-posterior edge depth plane;

[0032] 61-third three-dimensional image point;

[0033] 70-front edge depth plane;

[0034] 71-fourth three-dimensional image point;

[0035] d1-the distance between the optical modulation module 30 and the designed observation position 50; P-the period of the lens unit 31; g-the distance between the display panel 20 and the optical modulation module 30; L-the distance between the optical modulation module 30 and the central depth plane 40; z1-the distance between the rear edge depth plane 60 and the central depth plane 40; z2-the distance between the front edge depth plane 70 and the central depth plane 40. DETAILED DESCRIPTION

[0036] The following describes the embodiments of the present application in conjunction with the accompanying drawings. It should be understood that the embodiments described below in conjunction with the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions of the embodiments of the present application.

[0037] Those skilled in the art will understand that, unless otherwise stated, the singular forms "a," "an," "said," and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of this application refers to the presence of the described features, integers, steps, and / or operations, but does not exclude the implementation of other features, information, data, steps, operations, and / or combinations thereof supported by the technical field. The term "and / or" used herein refers to at least one of the items defined by the term, for example, "A and / or B" can be implemented as "A," or as "B," or as "A and B."

[0038] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0039] First, the relevant technologies involved in this application are described:

[0040] Integrated imaging stereoscopic display technology has the characteristics of naked-eye viewing, a simple display process, and viewers are less likely to feel viewing fatigue. Therefore, 3D display devices based on integrated stereoscopic display technology have become the current key research and development direction. Such 3D display devices usually include a display panel and a lens array.

[0041] Currently, due to the limitations of pixel size and number in the display panel, the stereoscopic images displayed by 3D display devices have obvious granularity due to low resolution; at the same time, in order to ensure the display depth, the lens pitch of the lens array needs to be increased, which will further reduce the resolution of the stereoscopic image.

[0042] The display device and display method provided in this application are aimed at solving the above technical problems in the prior art.

[0043] The following is a detailed description of the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems with specific embodiments. It should be noted that the following embodiments can refer to, draw on, or combine with each other, and the same terms, similar features, and similar implementation steps in different embodiments will not be repeated.

[0044] The embodiment of the present application provides a display device, the structural diagram of which is shown in FIG. Figure 1 and Figure 2 The display device includes a backlight module 10 , a display panel 20 and an optical modulation module 30 .

[0045] In the embodiment of the present application, the display panel 20 is located on one side of the backlight module 10 and includes at least two display units 21. The optical modulation module 30 is located on the side of the display panel 20 away from the backlight module 10 and includes at least two lens units 31. The central depth plane 40 of the display device is located on the side of the optical modulation module 30 away from the display panel 20.

[0046] In the embodiment of the present application, the backlight module 10 alternately switches between a first working mode and a second working mode, and the switching frequency between the first working mode and the second working mode is greater than the frequency required for visual persistence; in the first working mode, the display image of each display unit 21 forms a first reconstructed image point on the central depth plane 40 after passing through a lens unit 31, and at least two first reconstructed image points form a first three-dimensional stereoscopic image point 41; in the second working mode, the display image of each display unit 21 forms a second reconstructed image point on the central depth plane 40 after passing through a lens unit 31, and at least two second reconstructed image points form a second three-dimensional stereoscopic image point 42; the positions of the first three-dimensional stereoscopic image point 41 and the second three-dimensional stereoscopic image point 42 in the central depth plane 40 do not overlap.

[0047] In the display device provided in the embodiment of the present application, when the backlight module 10 is in the first working mode, a first three-dimensional stereoscopic image point 41 is formed on the central depth plane 40, and when the backlight module 10 is in the second working mode, a second three-dimensional stereoscopic image point 42 is formed on the central depth plane 40. The positions of the first three-dimensional stereoscopic image point 41 and the second three-dimensional stereoscopic image point 42 in the central depth plane 40 do not overlap, and the switching frequency between the first working mode and the second working mode is greater than the frequency required for visual residual, so that the viewer can view the first three-dimensional stereoscopic image point 41 and the second three-dimensional stereoscopic image point 42, thereby multiplying the number of three-dimensional stereoscopic image points of the three-dimensional stereoscopic image viewed by the viewer, thereby improving the resolution of the three-dimensional stereoscopic image, reducing the graininess of the three-dimensional stereoscopic image, and ensuring the viewer's viewing experience.

[0048] In the embodiment of this application, Figure 1 and Figure 2 As shown, the display panel 20 is located on one side of the backlight module 10, and the optical modulation module 30 is located on the side of the display panel 20 away from the backlight module 10, that is, along the light emitting direction of the backlight module 10, the backlight module 10, the display panel 20 and the optical modulation module 30 are arranged in sequence, and the central depth plane 40 is located on the side of the optical modulation module 30 away from the display panel 20.

[0049] In the embodiment of the present application, the central depth plane 40 is the first three-dimensional image point 41 and the second three-dimensional image point 42, that is, the central depth plane 40 is the plane where the three-dimensional image viewed by the viewer is located. Since the central depth plane 40 is not a physical component, such as Figure 1 and Figure 2 As shown, the central depth plane 40 is indicated by a dashed line.

[0050] In the embodiment of this application, Figure 1 and Figure 2As shown, the display panel 20 includes a plurality of display units 21, optionally arranged in an array. The optical modulation module 30 includes a plurality of lens units 31, optionally arranged in an array. Optionally, the number of display units 21 is the same as the number of lens units 31, that is, each display unit 21 is configured with a lens unit 31, so that the display image of each display unit 21 can form a first reconstructed image point or a second reconstructed image point on the central depth plane 40 after being modulated by the lens unit 31.

[0051] Optionally, the lens unit 31 is an aspherical lens or a trapezoidal lens, which helps reduce the impact of the spherical aberration of the lens unit 31 on the first reconstructed image point or the second reconstructed image point, helping to ensure the quality of the three-dimensional stereoscopic image displayed on the central depth plane 40. Optionally, the lens unit 31 can also be a cylindrical lens.

[0052] In the embodiment of this application, Figure 1 As shown, when the backlight module 10 is in the first working mode, the display image of each display unit 21 forms a first reconstructed image point on the central depth plane 40 after passing through a lens unit 31, and at least two first reconstructed image points form a first three-dimensional stereoscopic image point 41.

[0053] In the embodiment of this application, Figure 2 As shown, when the backlight module 10 is in the second working mode, the display image of each display unit 21 forms a second reconstructed image point on the central depth plane 40 after passing through a lens unit 31, and at least two second reconstructed image points form a second three-dimensional stereoscopic image point 42.

[0054] In the embodiment of the present application, the backlight module 10 switches alternately between the first operating mode and the second operating mode. Since the switching frequency of the two operating modes is greater than the frequency required for visual persistence, due to the visual persistence effect, the first three-dimensional stereoscopic image point 41 displayed in the first operating mode and the second three-dimensional stereoscopic image point 42 displayed in the second operating mode can both be seen by the viewer at the same time. Moreover, since the positions of the first three-dimensional stereoscopic image point 41 and the second three-dimensional stereoscopic image point 42 in the central depth plane 40 do not overlap, the number of three-dimensional stereoscopic image points (including the first three-dimensional stereoscopic image point 41 and the second three-dimensional stereoscopic image point 42) of the three-dimensional stereoscopic image viewed by the viewer is multiplied, thereby improving the resolution of the three-dimensional stereoscopic image, reducing the graininess of the three-dimensional stereoscopic image, and ensuring the viewer's viewing experience.

[0055] In the embodiment of the present application, a three-dimensional stereoscopic image point refers to a three-dimensional pixel point that forms a three-dimensional stereoscopic image. Each three-dimensional pixel point includes at least two reconstructed image points. The reconstructed image point is formed in the central depth plane 40 after the light output from a sub-pixel unit in the display unit 21 is modulated by the lens unit 31.

[0056] It should be noted that in order to facilitate readers to intuitively understand the three-dimensional images viewed by viewers, such as Figure 2 As shown, the first three-dimensional stereoscopic image point 41 existing due to the visual aftereffect is indicated by a dotted line.

[0057] from Figure 2 As can be seen in FIG, the first 3D image point 41 and the second 3D image point 42 do not overlap in the central depth plane 40, that is, there is a certain distance between the first 3D image point 41 and the adjacent second 3D image point 42. Optionally, the distance between any first 3D image point 41 and the adjacent second 3D image point 42 is the same.

[0058] Optionally, in one embodiment of the present application, the switching frequency between the first working mode and the second working mode is not less than 120 Hz to ensure that the first three-dimensional stereoscopic image point 41 displayed in the first working mode and the second three-dimensional stereoscopic image point 42 displayed in the second working mode can be seen by the viewer at the same time.

[0059] Alternatively, as Figure 1 and Figure 2 As shown, in one embodiment of the present application, the backlight module 10 includes: a light guide plate 11 , a beam splitter prism 12 , a first light emitting component 13 and a second light emitting component 14 .

[0060] In the embodiment of the present application, the beam splitter prism 12 is disposed on one side of the light guide plate 11 , the first light emitting component 13 is located at one end of the light guide plate 11 , and the second light emitting component 14 is located at the other end of the light guide plate 11 .

[0061] In the embodiment of the present application, when the backlight module 10 is in the first working mode, the second light-emitting component 14 is off, the first light-emitting component 13 is on, and the outgoing light of the first light-emitting component 13 passes through the light guide plate 11, the dichroic prism 12, the display unit 21 and the lens unit 31 in sequence to form a first three-dimensional stereoscopic image point 41 including at least two first reconstructed image points; when the backlight module 10 is in the second working mode, the first light-emitting component 13 is off, the second light-emitting component 14 is on, and the outgoing light of the second light-emitting component 14 passes through the light guide plate 11, the dichroic prism 12, the display unit 21 and the lens unit 31 in sequence to form a second three-dimensional stereoscopic image point 42 including at least two second reconstructed image points.

[0062] In the embodiment of this application, Figure 1 and Figure 2 As shown, the beam splitter prism 12 is disposed on the light-emitting side of the light guide plate 11. Along a direction parallel to the light guide plate 11, the first light-emitting component 13 and the second light-emitting component 14 are respectively located at one end of the light guide plate 11.

[0063] Alternatively, as Figure 1 As shown, when the backlight module 10 is in the first working mode, the first light-emitting component 13 is in the lit state, and the second light-emitting component 14 is in the extinguished state. The outgoing light of the first light-emitting component 13 is incident into the light guide plate 11 through one end face of the light guide plate 11. After the outgoing light passes through the light guide plate 11 and the dichroic prism 12 in sequence, a display image is formed on the display unit 21. After the display image is modulated by the lens unit 31, a first reconstructed image point is formed on the central depth plane 40, and a first three-dimensional stereoscopic image point 41 is formed on the central depth plane 40.

[0064] Alternatively, as Figure 2 As shown, when the backlight module 10 is in the first working mode, the first light-emitting component 13 is in an off state, and the second light-emitting component 14 is in a lit state. The outgoing light of the second light-emitting component 14 is incident into the light guide plate 11 through the other end face of the light guide plate 11. After the outgoing light passes through the light guide plate 11 and the dichroic prism 12 in sequence, a display image is formed on the display unit 21. After the display image is modulated by the lens unit 31, a second reconstructed image point is formed on the central depth plane 40, and a second three-dimensional stereoscopic image point 42 is formed on the central depth plane 40.

[0065] In the embodiment of this application, Figure 1 and Figure 2 As shown, when the backlight module 10 is in the working state, only one of the first light-emitting component 13 and the second light-emitting component 14 will be lit.

[0066] During the implementation of this application, Figure 1 and Figure 2 As shown, by arranging a dichroic prism 12 on the light-emitting side of the light guide plate 11, the outgoing light rays of the first light-emitting component 13 and the second light-emitting component 14 are incident on different positions of the same display unit 21 at different angles, so that the central depth plane 40 forms a first three-dimensional stereoscopic image point 41 and a second three-dimensional stereoscopic image point 42 whose positions do not overlap.

[0067] Optionally, in the embodiment of the present application, the first light-emitting component 13 and the second light-emitting component 14 each include a plurality of LEDs (Light Emitting Diodes), and optionally, the LEDs are white light LEDs.

[0068] It should be noted that if Figure 1 and Figure 2 As shown, the arrow line represents the propagation path of the light, in order to intuitively show the structure of the display device, as shown in FIG. Figure 1 and Figure 2 The figure only schematically shows a light path diagram of a display unit 21 and its corresponding lens unit 31 .

[0069] Optionally, in one embodiment of the present application, the display unit 21 includes at least two sub-pixel units, and the outgoing light of the backlight module 10 forms a Gaussian beam after passing through the sub-pixel unit and the lens unit 31, and the central depth plane 40 is located at the narrowest point of the Gaussian beam.

[0070] In the embodiment of the present application, each display unit 21 includes a plurality of sub-pixel units. The outgoing light of the backlight module 10 is incident on each sub-pixel unit of the display unit 21 to form a two-dimensional display image. The display image forms a Gaussian beam after passing through the lens unit 31, such as Figure 3 As shown in FIG, it is exemplarily shown that the display image forms a Gaussian beam after passing through a lens unit 31, such as Figure 3 As shown, along the arrangement direction perpendicular to the lens unit 31, the Gaussian beam first contracts and then expands, that is, each Gaussian beam has a narrowest point, as shown in FIG. Figure 3 As shown, the central depth plane 40 is located at the narrowest point of the Gaussian beam, that is, the narrowest points of all Gaussian beams form the central depth plane 40 of the display device.

[0071] In an embodiment of the present application, by setting each display unit 21 to include multiple sub-pixel units, the resolution of the two-dimensional display image formed by each display unit 21 is improved, thereby improving the quality of the first reconstructed image point and the second reconstructed image point, and improving the resolution of the three-dimensional stereoscopic image formed by the display device.

[0072] Optionally, in one embodiment of the present application, the number of first reconstructed image points in the image of the first three-dimensional stereoscopic image point 41 incident on the designed area in the designed observation position 50 is greater than 2 and less than 5; the number of second reconstructed image points in the image of the second three-dimensional stereoscopic image point 42 incident on the designed area in the designed observation position 50 is greater than 2 and less than 5.

[0073] In the embodiment of the present application, the designed observation position 50 is the position of the viewer's eyes, and the designed area refers to the area of ​​a single eye of the viewer.

[0074] Those skilled in the art will appreciate that in order to achieve a single-eye focus adjustment effect, the number of image points incident on the eye must be at least two. Furthermore, if the number of image points incident on the eye is too large, the accuracy of the single-eye focus adjustment will be reduced. Therefore, in the embodiment of the present application, it is necessary to ensure that the number of first reconstructed image points in the image incident on the viewer's eye by each first three-dimensional image point 41 is greater than two and less than five. Similarly, the number of second reconstructed image points in the image incident on the viewer's eye by each second three-dimensional image point 42 is greater than two and less than five.

[0075] In the embodiment of the present application, the number of first reconstructed image points or the number of second reconstructed image points in the image incident on the single eye becomes the pupil viewpoint density N view.

[0076] Optionally, in one embodiment of the present application, all lens units 31 in the optical modulation module 30 are arranged in an array; the period P of the lens unit 31 is less than the first period P1 and greater than the second period P2; the first period P1 is negatively correlated with the number of first reconstructed image points or second reconstructed image points along the first direction in the image within the design area, and positively correlated with the design pupil diameter D, and the first direction is parallel to the central depth plane 40; the second period P2 is positively correlated with the first distance d1 and the design resolution angle θ, and the first distance d is the distance between the optical modulation module 30 and the design observation position 50.

[0077] In the embodiment of the present application, the period P of the lens unit 31 is smaller than the first period P1 and larger than the second period P2 to ensure the imaging quality of the three-dimensional image.

[0078] Optionally, the specific value of the first period P1 can be determined according to the following relationship (1).

[0079]

[0080] In equation (1), N 水平 It represents the number of first reconstructed image points or second reconstructed image points along the first direction in the image within the design area, and D represents the design pupil diameter.

[0081] Optionally, in the embodiment of the present application, the pupil viewpoint density N view =4, in order to ensure the consistency of the focus adjustment of the single eye in the horizontal and vertical directions, N is designed 水平 =N 垂直 =2, that is, in the image incident into the single eye, the number of the first reconstructed image points or the second reconstructed image points along the first direction (horizontal direction) is two, and the number of the first reconstructed image points or the second reconstructed image points along the second direction (vertical direction) is also two.

[0082] Optionally, the pupil diameter D is designed to be the average pupil diameter of an adult, D=3 mm (millimeter), then according to the relationship (1), it can be determined that P1=1.5 mm.

[0083] Optionally, the specific value of the second period P2 can be determined according to the following relationship (2).

[0084] P2=θ*d1*π Relationship (2)

[0085] In equation (2), θ represents the designed resolution angle, and d1 represents the distance between the optical modulation module 30 and the designed observation position 50 .

[0086] Optionally, in the embodiment of the present application, the design resolution angle θ is the retinal resolution angle of the human eye. In order to avoid the influence of diffraction caused by the lens unit 31 being too small on the retinal image, it is necessary to ensure that the design resolution angle θ is smaller than the opening angle of the lens unit 31 to the human eye, that is, the angle value converted from the ratio of the minimum period P2 of the lens unit 31 to the first distance d1 is greater than the design resolution angle θ, so that the relationship formula (2) of the second period P2 can be determined.

[0087] Alternatively, the retinal resolution angle of the human eye is generally 1 arc minute. When the first distance d1 is 2 m (meter), the second period P2 can be determined to be 0.6 mm according to equation (2). That is, the period P of the lens unit 31 is less than 1.5 mm and greater than 0.6 mm.

[0088] Optionally, in one embodiment of the present application, a ratio K of the diameter of the lens unit 31 to the period P of the lens unit 31 is not less than 0.6 and not greater than 0.8.

[0089] As the diameter of the lens unit 31 changes within a certain range, the accuracy of single-eye focus adjustment increases as the diameter of the lens unit 31 decreases. At the same time, the brightness of the light emitted by the lens unit 31 decreases as the diameter of the lens unit 31 decreases. Therefore, to balance the accuracy of single-eye focus adjustment with the brightness of the light emitted by the lens unit 31, in the embodiment of the present application, the ratio K of the diameter of the lens unit 31 to the period P of the lens unit 31 is not less than 0.6 and not greater than 0.8, thereby ensuring the accuracy of single-eye focus adjustment and the brightness of the three-dimensional stereoscopic image.

[0090] Optionally, in one embodiment of the present application, the distance g between the display panel 20 and the optical modulation module 30 is less than the second distance d2 and greater than the third distance d3; the second distance d2 is positively correlated with the period P of the lens unit 31 and negatively correlated with the viewing angle w of the display device; the third distance d3 is positively correlated with the period P of the lens unit 31 and negatively correlated with the designed pupil diameter D.

[0091] In the embodiment of the present application, by setting the distance g between the display panel 20 and the optical modulation module 30 to be less than the second distance d2 and greater than the third distance d3, it can be ensured that the first reconstructed image point or the second reconstructed image point formed by the display image of each display unit 21 after modulation by the lens Danyun 31 can be incident on the viewer's eyes, thereby ensuring the display effect of the three-dimensional stereoscopic image.

[0092] Optionally, in an embodiment of the present application, the second distance d2 is equal to the ratio of the period P of the lens unit 31 to twice the tangent value of half the viewing angle w of the display device; the third distance d3 is equal to the ratio of the product of the period P of the lens unit 31 and the first difference to the designed pupil diameter D, the first difference is equal to the difference between the first distance d1 and the fourth distance L, and the fourth distance L is the distance between the optical modulation module 30 and the central depth plane 40.

[0093] Optionally, the specific value of the second distance d2 can be determined according to the following relationship (3).

[0094]

[0095] In the relational expression (3), P represents the period of the lens unit 31, and w represents the viewing angle of the display device.

[0096] It should be noted that the viewing angle w of the display device refers to the maximum angular range in which the three-dimensional stereoscopic image displayed by the display device can be viewed by the viewer. That is, when the brightness of two viewing directions on the same plane is half of the brightness in the normal direction of the display device, the angle formed by these two viewing directions in the normal direction of the display device is called the viewing angle w of the display device.

[0097] Optionally, the specific value of the third distance d3 can be determined according to the following relationship (4).

[0098]

[0099] In equation (4), P represents the period of the lens unit 31, d1 represents the distance between the optical modulation module 30 and the designed observation position 50, D represents the designed pupil diameter; and L represents the fourth distance, that is, the distance between the central depth plane 40 and the optical modulation module 30.

[0100] Optionally, in one embodiment of the present application, the fourth distance L between the optical modulation module 30 and the central depth plane 40 is not less than the first parameter C1 and not greater than the second parameter C2; the first parameter C1 is the maximum value between the third parameter C3 and the fourth parameter C4, the second parameter C2 is the minimum value between the fifth parameter C5 and the sixth parameter C6, and the third parameter C3, the fourth parameter C4, the fifth parameter C5 and the sixth parameter C6 are all positively correlated with the first distance d1.

[0101] Optionally, the specific value of the third parameter C3 can be determined according to relationship (5).

[0102]

[0103] In equation (5), d1 represents the distance between the optical modulation module 30 and the designed observation position 50, g represents the distance between the display panel 20 and the optical modulation module 30, Prmax represents the maximum size of the first three-dimensional stereoscopic image point 41 or the second three-dimensional stereoscopic image point 42, and Ppixel represents the size of the sub-pixel unit in the display unit 21.

[0104] Optionally, the specific value of the fourth parameter C4 can be determined according to relationship (6).

[0105]

[0106] In equation (6), d1 represents the distance between the optical modulation module 30 and the designed observation position 50 , Pr represents the size of the first three-dimensional stereoscopic image point 41 or the second three-dimensional stereoscopic image point 42 , and P represents the period of the lens unit 31 .

[0107] In the embodiment of the present application, the first parameter C1 is the maximum value between the third parameter C3 and the fourth parameter C4, that is, the minimum value of the fourth distance L between the optical modulation module 30 and the central depth plane 40 is the maximum value between the third parameter C3 and the fourth parameter C4.

[0108] Optionally, the specific value of the fifth parameter C5 can be determined according to relationship (7).

[0109]

[0110] In equation (7), d1 represents the distance between the optical modulation module 30 and the designed observation position 50, ΔZmin represents the minimum depth of field of the display device, Pr represents the size of the first three-dimensional stereoscopic image point 41 or the second three-dimensional stereoscopic image point 42, and P represents the period of the lens unit 31.

[0111] Optionally, the specific value of the fifth parameter C6 can be determined according to relationship (8).

[0112]

[0113] In equation (8), d1 represents the distance between the optical modulation module 30 and the designed observation position 50, P represents the period of the lens unit 31, D represents the designed pupil diameter, n represents the refractive index of the lens unit 31, g represents the distance between the display panel 20 and the optical modulation module 30, and λ represents the average wavelength of visible light. Optionally, the value of λ is 550 nanometers.

[0114] In the embodiment of the present application, the second parameter C2 is the minimum value between the fifth parameter C5 and the sixth parameter C6, that is, the maximum value of the fourth distance L between the optical modulation module 30 and the central depth plane 40 is the minimum value between the fifth parameter C5 and the sixth parameter C6.

[0115] Optionally, in one embodiment of the present application, the focal length f of the lens unit 31 is equal to the ratio of the seventh parameter to the eighth parameter; the seventh parameter is equal to the product of the fourth distance L and the distance g between the display panel 20 and the optical modulation module 30; the eighth parameter is equal to the sum of the fourth distance L and the distance g between the display panel 20 and the optical modulation module 30.

[0116] Optionally, in the embodiment of the present application, the specific value of the focal length f of the lens unit 31 can be determined according to the relationship (9).

[0117]

[0118] In the relational expression (9), L represents the fourth distance between the optical modulation module 30 and the central depth plane 40 , and g represents the distance between the display panel 20 and the optical modulation module 30 .

[0119] Optionally, in the embodiment of the present application, the focal length f of the lens unit 31 is smaller than the distance g between the display panel 20 and the optical modulation module 30 .

[0120] Optionally, in the embodiment of the present application, the distance d1 between the optical modulation module 30 and the designed observation position 50 is greater than the fourth distance L between the optical modulation module 30 and the central depth plane 40. Optionally, the distance d1 between the optical modulation module 30 and the designed observation position 50 is greater than 250 mm.

[0121] Alternatively, as Figure 3 As shown, the plane where the first three-dimensional stereoscopic image point 41 is located is the central depth plane 40 , and the three-dimensional stereoscopic image at the central depth plane 40 has the highest resolution.

[0122] like Figure 3 As shown, along the propagation direction of the Gaussian beam, a third three-dimensional image point 61 is formed on the left side of the first three-dimensional image point 41, and a fourth three-dimensional image point 71 is formed on the right side of the first three-dimensional image point 41. The third three-dimensional image point 61 and the fourth three-dimensional image point 71 are both larger than the first three-dimensional image point 41. The plane where the third three-dimensional image point 61 lies is the rear edge depth plane 60, and the plane where the fourth three-dimensional image point 71 lies is the front edge depth plane 70.

[0123] The distance between the rear edge depth plane 60 where the third three-dimensional image point 61 is located and the central depth plane 40 is z1, and the distance between the front edge depth plane 70 where the fourth three-dimensional image point 71 is located and the central depth plane 40 is z2. In the embodiment of the present application, the depth of field ΔZ of the display device is equal to the absolute value of the difference between the distance z1 and the distance z2.

[0124] Alternatively, as Figure 3 As shown, α e It shows the opening angle of the first three-dimensional stereoscopic image point 41 or the second three-dimensional stereoscopic image point 42 relative to the eyes of the observer located at the designed observation position 50 .

[0125] Optionally, in the embodiment of the present application, the display device is a large-size display device. In order to further illustrate the beneficial effects of the display device provided by the embodiment of the present application, the applicant of the present application tested three display devices, as shown in Table 1. Please refer to the above description for the meaning of the various parameter letters in Table 1, which will not be repeated here.

[0126] Table 1

[0127] Parameter (unit) The first display device The second display device The third display device <![CDATA[N view (items)]]> 4 4 4 P(mm) 1.5 1.5 1.5 g(mm) 20 20 20 f(mm) 19 19 19 k 0.6 0.6 0.6 Ppixel(mm) 0.00085 0.00085 0.00085 L(mm) 1000 1200 1500 d1(mm) 2000 2000 2000 Pr(mm) 0.4 0.5 0.6 θ (arc minutes) 1.5 2.2 4.4 ΔZ(mm) 564 1354 1693

[0128] As shown in Table 1, the differences between the first display device, the second display device, and the third display device mainly lie in the fourth distance L between the optical modulation module 30 and the central depth plane 40, the size Pr of the first three-dimensional stereoscopic image point 41 or the second three-dimensional stereoscopic image point 42, the design resolution angle θ, and the depth of field ΔZ.

[0129] The applicant of the present application tested the first display device, the second display device, and the third display device shown in Table 1 and obtained the following test results: the visible area of ​​the three-dimensional stereoscopic image of the first display device was 75 mm, the visible area of ​​the three-dimensional stereoscopic image of the second display device was 90 mm, and the visible area of ​​the three-dimensional stereoscopic image of the third display device was 112 mm.

[0130] According to Table 1 and the test results, the first display device can obtain smaller-sized first 3D image points 41 or second 3D image points 42, thereby enabling the first display device to obtain higher resolution. The third display device can obtain a larger viewing area and depth of field.

[0131] Based on the same inventive concept, an embodiment of the present application provides a display method, which includes the following steps: controlling the backlight module to switch to a first operating mode to form at least one first three-dimensional stereoscopic image point in a central depth plane; controlling the backlight module to switch to a second operating mode to form at least one second three-dimensional stereoscopic image point in the central depth plane, and the second three-dimensional stereoscopic image point is adjacent to the position of the first three-dimensional stereoscopic image point; controlling the switching frequency between the first operating mode and the second operating mode to be greater than a set frequency, so that a viewer at a designed observation position can simultaneously view a three-dimensional stereoscopic image formed by the first three-dimensional stereoscopic image point and the second three-dimensional stereoscopic image point.

[0132] The display method provided in the embodiment of the present application is based on the display device provided in any of the above embodiments. By controlling the switching frequency between the first working mode and the second working mode to be greater than the frequency required for visual persistence, the viewer can view the first three-dimensional stereoscopic image point 41 and the second three-dimensional stereoscopic image point 42, thereby exponentially increasing the number of three-dimensional stereoscopic image points of the three-dimensional stereoscopic image viewed by the viewer, thereby improving the resolution of the three-dimensional stereoscopic image, reducing the graininess of the three-dimensional stereoscopic image, and ensuring the viewer's viewing experience.

[0133] By applying the embodiments of the present application, at least the following beneficial effects can be achieved:

[0134] In the display device provided in the embodiment of the present application, when the backlight module 10 is in the first working mode, a first three-dimensional stereoscopic image point 41 is formed on the central depth plane 40, and when the backlight module 10 is in the second working mode, a second three-dimensional stereoscopic image point 42 is formed on the central depth plane 40. The positions of the first three-dimensional stereoscopic image point 41 and the second three-dimensional stereoscopic image point 42 in the central depth plane 40 do not overlap, and the switching frequency between the first working mode and the second working mode is greater than the frequency required for visual residual, so that the viewer can view the first three-dimensional stereoscopic image point 41 and the second three-dimensional stereoscopic image point 42, thereby multiplying the number of three-dimensional stereoscopic image points of the three-dimensional stereoscopic image viewed by the viewer, thereby improving the resolution of the three-dimensional stereoscopic image, reducing the graininess of the three-dimensional stereoscopic image, and ensuring the viewer's viewing experience.

[0135] Those skilled in the art will appreciate that the steps, measures, and schemes in the various operations, methods, and processes discussed in this application may be interchanged, modified, combined, or deleted. Furthermore, other steps, measures, and schemes in the various operations, methods, and processes discussed in this application may also be interchanged, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and schemes in the prior art that are similar to those disclosed in this application may also be interchanged, modified, rearranged, decomposed, combined, or deleted.

[0136] In the description of this application, the directions or positional relationships indicated by words such as "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are exemplary directions or positional relationships based on the accompanying drawings. They are intended to facilitate or simplify the description of the embodiments of this application, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application.

[0137] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0138] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0139] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0140] It should be understood that, although the various steps in the flowchart of the accompanying drawings are displayed in sequence as indicated by the arrows, the order of implementation of these steps is not limited to the order indicated by the arrows. Unless otherwise clearly stated herein, in some implementation scenarios of the embodiments of the present application, the steps in each process can be performed in other orders as required. Moreover, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages based on actual implementation scenarios. Some or all of these sub-steps or stages may be executed at the same time, or may be executed at different times in different scenarios at the execution time. The execution order of these sub-steps or stages may be flexibly configured as required, and the embodiments of the present application do not limit this.

[0141] The above is only part of the implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the technical concept of the solution of the present application, other similar implementation methods based on the technical ideas of the present application also fall within the protection scope of the embodiments of the present application.

Claims

1. A display device, characterized in that: include: Backlight module; A display panel is located on one side of the backlight module, and the display panel includes at least two display units; an optical modulation module located on a side of the display panel away from the backlight module; a central depth plane of the display device is located on a side of the optical modulation module away from the display panel; the optical modulation module includes at least two lens units; The backlight module alternately switches between a first working mode and a second working mode, and the switching frequency between the first working mode and the second working mode is greater than the frequency required for visual persistence; in the first working mode, the display image of each display unit forms a first reconstructed image point on the central depth plane after passing through one of the lens units, and at least two of the first reconstructed image points form a first three-dimensional stereoscopic image point; in the second working mode, the display image of each display unit forms a second reconstructed image point on the central depth plane after passing through one of the lens units, and at least two of the second reconstructed image points form a second three-dimensional stereoscopic image point; the positions of the first three-dimensional stereoscopic image point and the second three-dimensional stereoscopic image point on the central depth plane do not overlap.

2. The display device according to claim 1, wherein The backlight module includes: Light guide plate; a beam splitter prism, disposed on one side of the light guide plate; A first light-emitting component is located at one end of the light guide plate; The second light-emitting component is located at the other end of the light guide plate away from the first light-emitting component; in a first operating mode, the second light-emitting component is off and the first light-emitting component is on, and the outgoing light of the first light-emitting component passes through the light guide plate, the dichroic prism, the display unit and the lens unit in sequence to form the first three-dimensional stereoscopic image point including at least two first reconstructed image points; in a second operating mode, the first light-emitting component is off and the second light-emitting component is on, and the outgoing light of the second light-emitting component passes through the light guide plate, the dichroic prism, the display unit and the lens unit in sequence to form the second three-dimensional stereoscopic image point including at least two second reconstructed image points.

3. The display device according to claim 1, wherein The display unit includes at least two sub-pixel units. The outgoing light of the backlight module forms a Gaussian beam after passing through the sub-pixel units and the lens unit. The central depth plane is located at the narrowest point of the Gaussian beam.

4. The display device according to claim 1, wherein The number of the first reconstructed image points in the image of the first three-dimensional image point incident on the designed area at the designed observation position is greater than 2 and less than 5; The number of the second reconstructed image points in the image of the second three-dimensional image point incident on the designed area at the designed observation position is greater than 2 and less than 5.

5. The display device according to claim 4, wherein: All the lens units in the optical modulation module are arranged in an array; The period of the lens unit is smaller than the first period and larger than the second period; the first period is negatively correlated with the number of the first reconstructed image points or the second reconstructed image points along the first direction in the image within the design area, and is positively correlated with the design pupil diameter, and the first direction is parallel to the central depth plane; the second period is positively correlated with the first distance and the design resolution angle, and the first distance is the distance between the optical modulation module and the design observation position.

6. The display device according to claim 5, wherein: A ratio of a diameter of the lens unit to a period of the lens unit is not less than 0.6 and not more than 0.

8.

7. The display device according to claim 5, wherein: The distance between the display panel and the optical modulation module is smaller than the second distance and larger than the third distance; The second distance is positively correlated with the period of the lens unit and negatively correlated with the viewing angle of the display device; the third distance is positively correlated with the period of the lens unit and negatively correlated with the designed pupil diameter.

8. The display device according to claim 7, wherein: The second distance is equal to a ratio of a period of the lens unit to two times a tangent value of half a viewing angle of the display device; The third distance is equal to the ratio of the product of the period of the lens unit and the first difference to the designed pupil diameter, the first difference is equal to the difference between the first distance and the fourth distance, and the fourth distance is the distance between the optical modulation module and the central depth plane.

9. The display device according to claim 5, wherein: A fourth distance between the optical modulation module and the central depth plane is not less than the first parameter and not greater than the second parameter; The first parameter is the maximum value between the third parameter and the fourth parameter, the second parameter is the minimum value between the fifth parameter and the sixth parameter, and the third parameter, the fourth parameter, the fifth parameter and the sixth parameter are all positively correlated with the first distance.

10. The display device according to claim 1, wherein The focal length of the lens unit is equal to the ratio of the seventh parameter to the eighth parameter; The seventh parameter is equal to the product of the fourth distance and the distance between the display panel and the optical modulation module; The eighth parameter is equal to the sum of the fourth distance and the distance between the display panel and the optical modulation module.

11. The display device according to claim 1, wherein The switching frequency between the first working mode and the second working mode is not less than 120 Hz.

12. A display method based on the display device according to any one of claims 1 to 11, characterized in that: include: Controlling the backlight module to switch to a first operating mode to form at least one first three-dimensional stereoscopic image point on a central depth plane; Controlling the backlight module to switch to a second operating mode to form at least one second three-dimensional image point in the central depth plane, where the second three-dimensional image point is adjacent to a position where the first three-dimensional image point is located; The switching frequency between the first and second operating modes is controlled to be greater than a set frequency, so that a viewer at a designed observation position can simultaneously view a 3D image formed by the first and second 3D image points.

Images