Display panel, display device and display method

Abstract

The present invention discloses a display panel, a display device and a display method. The display panel includes a display substrate, a polarization switching element and a microlens array, wherein: the display substrate is used to emit image light according to an input display image signal, the display substrate includes a plurality of pixel islands arranged in an array, and each pixel island includes at least two sub-pixel islands; the polarization switching element is used to switch the polarization state according to a switching signal input in a preset timing cycle and convert the image light into image polarized light corresponding to the switching signal, and the display image signal is synchronized with the switching signal; the microlens array includes a plurality of microlens units corresponding to the sub-pixel islands one by one, the focal length of each microlens unit is variable, and the variable focal lengths of the microlens units corresponding to the sub-pixel islands of each pixel island are all different, and the microlens units corresponding to the sub-pixel islands in each pixel island are used to respectively image the image polarized light into three-dimensional display images based on different central imaging planes to form a multi-focal plane light field display.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display panel, a display device and a display method. Background Art

[0002] The common naked-eye 3D display with binocular parallax now displays 3D objects by showing different images to the user's left and right eyes respectively, forming a stereoscopic vision. Since the 3D display based on binocular stereoscopic vision has the problem of convergence adjustment conflict, it will cause eye fatigue and dizziness when users wear it for a long time. This is a problem that needs to be solved urgently in stereoscopic display.

[0003] Light field display provides a feasible method to solve the user's eye fatigue and dizziness. By simulating the light field of natural 3D objects, natural 3D display is achieved, reducing human eye fatigue and dizziness. In addition to holographic display, the main method to achieve light field display is integrated imaging display using microlens arrays. For example, a layer of microlens array is superimposed in front of the display element, and the display image of integrated imaging is rendered on the display element. Through the control of light in all directions by the microlens array, a natural 3D display is formed. However, light field display has the problem of limited depth of field. Summary of the invention

[0004] In order to solve at least one of the above problems, the first aspect of the present invention provides a display panel, comprising a display substrate, a polarization switching element arranged on the light-emitting side of the display substrate, and a microlens array arranged on the side of the polarization switching element away from the display substrate, wherein:

[0005] The display substrate is used to emit image light according to an input display image signal, the display substrate includes a plurality of pixel islands arranged in an array, each pixel island includes at least two sub-pixel islands, each sub-pixel island includes a*b pixels, wherein a is an integer greater than or equal to 2, and b is an integer greater than or equal to 2;

[0006] The polarization switching element is used to switch the polarization state according to a switching signal input according to a preset timing cycle and convert the image light into image polarization light corresponding to the switching signal, and the display image signal is synchronized with the switching signal;

[0007] The microlens array includes a plurality of microlens units corresponding to the sub-pixel islands one by one, the focal length of each microlens unit is variable, and the variable focal lengths of the microlens units corresponding to the sub-pixel islands of each pixel island are different, and the microlens units corresponding to the sub-pixel islands in each pixel island are used to respectively image the image polarized light into three-dimensional display images based on different central imaging planes.

[0008] For example, in the display panel provided in some embodiments of the present application, the preset timing period includes a first time slot and a second time slot, and the switching signal includes a first time slot switching signal corresponding to the first time slot and a second time slot switching signal corresponding to the second time slot.

[0009] The polarization switching element is used to switch to the first polarization state according to the first time slot switching signal and convert the image light into the first image polarized light,

[0010] The polarization switching element is used to switch to a second polarization state according to a second time slot switching signal and convert the image light into a second image polarized light, where the second image polarized light is orthogonal to the first image polarized light.

[0011] For example, in the display panel provided in some embodiments of the present application,

[0012] The first image polarized light is s-linear polarized light, and the second image polarized light is p-linear polarized light;

[0013] or

[0014] The first image polarized light is left-handed circularly polarized light, and the second image polarized light is right-handed circularly polarized light.

[0015] For example, in the display panel provided in some embodiments of the present application, each microlens unit includes at least two microlenses, at least one of the at least two microlenses is a variable focal length microlens, and the variable focal length microlens forms different focal lengths according to the first image polarized light and the second image polarized light in different polarization states, and images the first image polarized light and the second image polarized light into a three-dimensional display image based on a central imaging plane with a corresponding focal length, respectively.

[0016] For example, in the display panel provided in some embodiments of the present application, the variable focal length microlens is one of a liquid crystal microlens, a birefringent microlens, a PB microlens and a metasurface microlens.

[0017] For example, in the display panel provided in some embodiments of the present application, the pixels of the sub-pixel island are arranged in a polygonal shape.

[0018] For example, in the display panel provided in some embodiments of the present application, the pixels of the sub-pixel island are arranged in a hexagonal shape.

[0019] A second aspect of the present invention provides a display device, comprising the display panel described in the first aspect.

[0020] For example, in some embodiments of the present application, the display device further includes a driving unit, wherein the driving unit includes a driving control unit and an image rendering unit.

[0021] The driving control unit is used to output a switching signal to the polarization switching element of the display panel according to a preset timing cycle, and output a synchronization control signal synchronized with the switching signal to the image rendering unit;

[0022] The image rendering unit is used to output a display image signal to a display substrate of the display panel according to the synchronization control signal;

[0023] The display substrate is used to emit image light according to the display image signal;

[0024] The polarization switching element is used to switch the polarization state according to the switching signal and convert the image light into image polarized light corresponding to the switching signal;

[0025] The microlens units in the microlens array corresponding to each sub-pixel island in each pixel island are used to image the image polarization light into a three-dimensional display image based on the central imaging plane of the focal length of different microlens units.

[0026] For example, in a display device provided in some embodiments of the present application, each pixel island of a display substrate of the display panel includes a first sub-pixel island and a second sub-pixel island, the microlens array of the display panel includes a first microlens unit corresponding to the first sub-pixel island and a second microlens unit corresponding to the second sub-pixel island, the first microlens unit includes a first microlens with a fixed focal length and a first microlens with a variable focal length, the second microlens unit includes a second microlens with a fixed focal length and a second microlens with a variable focal length, the variable focal length of the second microlens with a variable focal length is different from the variable focal length of the first microlens with a variable focal length, and the variable focal length of the second microlens unit is different from the variable focal length of the first microlens with a variable focal length; the preset timing period includes a first time slot and a second time slot,

[0027] During the first time slot:

[0028] The driving control unit is used to output a first time slot switching signal to the polarization switching element of the display panel and output a first synchronization control signal to the image rendering unit.

[0029] The image rendering unit outputs a first display image signal to a display substrate of the display panel according to a first synchronization control signal.

[0030] The display substrate is used to emit a first image light according to the first display image signal.

[0031] The polarization switching element is used to switch to the first polarization state according to the first time slot switching signal and convert the first image light into the first image polarized light,

[0032] The first variable focal length microlens is used to determine a first temporary focal length according to the first image polarized light, and the first microlens unit is used to determine a first focal length according to the focal length of the first fixed focal length microlens and the first temporary focal length, and to image the first image polarized light into a three-dimensional display image based on a first central imaging plane of the first focal length;

[0033] The second variable focal length microlens is used to determine a second temporary focal length according to the first image polarized light, and the second microlens unit is used to determine a second focal length according to the focal length of the second fixed focal length microlens and the second temporary focal length, and to image the first image polarized light into a three-dimensional display image based on a second central imaging plane of the second focal length;

[0034] During the second time slot:

[0035] The driving control unit is used to output a second time slot switching signal to the polarization switching element of the display panel and output a second synchronization control signal to the image rendering unit.

[0036] The image rendering unit is used to output a second display image signal to the display substrate of the display panel according to a second synchronization control signal.

[0037] The display substrate is used to emit a second image light according to the second display image signal.

[0038] the polarization switching element is used to switch to a second polarization state according to the second time slot switching signal and convert the second image light into a second image polarized light,

[0039] The first variable focal length microlens is used to determine a third temporary focal length according to the second image polarized light, and the first microlens unit is used to determine a third focal length according to the focal length of the first fixed focal length microlens and the third temporary focal length, and to image the second image polarized light into a three-dimensional display image based on a third central imaging plane of the third focal length;

[0040] The second variable focal length microlens is used to determine a fourth temporary focal length according to the second image polarized light, and the second microlens unit is used to determine a fourth focal length according to the focal length of the second fixed focal length microlens and the fourth temporary focal length, and to image the second image polarized light into a three-dimensional display image based on a fourth central imaging plane of the fourth focal length;

[0041] The first focal length, the second focal length, the third focal length and the fourth focal length are all different.

[0042] A third aspect of the present invention provides a display method using the display device of the second aspect, wherein the display device further comprises a driving unit, wherein the driving unit comprises a driving control unit and an image rendering unit, including:

[0043] The driving control unit generates a switching signal and a synchronous control signal synchronized with the switching signal according to a preset timing cycle;

[0044] The driving control unit outputs the synchronization control signal to the image rendering unit, so that the image rendering unit outputs a display image signal to the display substrate of the display panel in response to the synchronization control signal, so that the display substrate emits image light in response to the display image signal;

[0045] The driving control unit outputs the switching signal to the polarization switching element, so that the polarization switching element switches the polarization state in response to the switching signal and converts the image light into image polarized light corresponding to the switching signal, so that the microlens units corresponding to each sub-pixel island in each pixel island in the microlens array respectively image the image polarized light into a three-dimensional display image based on the central imaging plane of the focal length of different microlens units.

[0046] For example, in the display method provided in some embodiments of the present application, each pixel island of the display substrate of the display panel includes a first sub-pixel island and a second sub-pixel island, the microlens array of the display panel includes a first microlens unit corresponding to the first sub-pixel island and a second microlens unit corresponding to the second sub-pixel island, the first microlens unit includes a first microlens with a fixed focal length and a first microlens with a variable focal length, the second microlens unit includes a second microlens with a fixed focal length and a second microlens with a variable focal length, the variable focal length of the second microlens with a variable focal length is different from the variable focal length of the first microlens with a variable focal length, and the variable focal length of the second microlens unit is different from the variable focal length of the first microlens unit; the preset timing period includes a first time slot and a second time slot,

[0047] During the first time slot:

[0048] The driving control unit generates a first time slot switching signal and a first synchronization control signal synchronized with the first time slot switching signal;

[0049] The driving control unit outputs the first synchronization control signal to the image rendering unit, so that the image rendering unit outputs a first display image signal to a display substrate of the display panel in response to the first synchronization control signal, so that the display substrate emits a first image light in response to the first display image signal;

[0050] The driving control unit outputs the first time slot switching signal to the polarization switching element, so that the polarization switching element switches to the first polarization state in response to the first time slot switching signal and converts the first image light into the first image polarized light, so that the first variable focal length microlens determines a first temporary focal length according to the first image polarized light, the first microlens unit determines a first focal length according to the focal length of the first fixed focal length microlens and the first temporary focal length, and images the first image polarized light into a three-dimensional display image based on a first central imaging plane of the first focal length, so that the second variable focal length microlens determines a second temporary focal length according to the first image polarized light, the second microlens unit determines a second focal length according to the focal length of the second fixed focal length microlens and the second temporary focal length, and images the first image polarized light into a three-dimensional display image based on a second central imaging plane of the second focal length;

[0051] During the second time slot:

[0052] The driving control unit generates a second time slot switching signal and a second synchronization control signal synchronized with the second time slot switching signal;

[0053] The driving control unit outputs the second synchronization control signal to the image rendering unit, so that the image rendering unit outputs a second display image signal to the display substrate of the display panel in response to the second synchronization control signal, so that the display substrate emits a second image light in response to the second display image signal;

[0054] The driving control unit outputs the second time slot switching signal to the polarization switching element, so that the polarization switching element switches to the second polarization state in response to the second time slot switching signal and converts the second image light into the second image polarized light, so that the first variable focal length microlens determines a third temporary focal length according to the second image polarized light, the first microlens unit determines a third focal length according to the focal length of the first fixed focal length microlens and the third temporary focal length, and images the second image polarized light into a three-dimensional display image based on a third central imaging plane of the third focal length, so that the second variable focal length microlens determines a fourth temporary focal length according to the second image polarized light, the second microlens unit determines a fourth focal length according to the focal length of the second fixed focal length microlens and the fourth temporary focal length, and images the second image polarized light into a three-dimensional display image based on a fourth central imaging plane of the fourth focal length;

[0055] The first focal length, the second focal length, the third focal length and the fourth focal length are all different.

[0056] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method described in the third aspect.

[0057] A fifth aspect of the present invention provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method described in the third aspect when executing the program.

[0058] The beneficial effects of the present invention are as follows:

[0059] In view of the existing problems, the present invention develops a display panel, a display device and a display method. The display panel utilizes a polarization switching element and a microlens array arranged on a display substrate to realize time division multiplexing and space division, forming a composite light field display based on microlens integrated imaging display and multi-focal plane display, thereby compensating for the problems existing in the prior art, effectively improving the display effect of naked-eye 3D, and having broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0061] Figure 1 A schematic diagram showing the use of a microlens array to achieve naked-eye 3D in the prior art;

[0062] Figure 2 A schematic diagram showing the use of integrated imaging light field display to form a central depth of field surface in the prior art;

[0063] Figure 3 A schematic diagram showing a multi-focal plane light field display using a 2D imaging plane in the prior art;

[0064] Figure 4 A schematic diagram showing the structure of a display panel according to an embodiment of the present invention is shown;

[0065] Figure 5 A schematic diagram showing multi-focal plane display of a 3D imaging plane of a display panel according to an embodiment of the present invention;

[0066] Figure 6 A schematic diagram showing the structure of a lens unit according to an embodiment of the present invention is shown;

[0067] Figure 7 A schematic diagram showing the structure of a sub-pixel island of a display substrate according to an embodiment of the present invention;

[0068] Figure 8 A schematic diagram showing the structure of a sub-pixel island of a display substrate according to another embodiment of the present invention;

[0069] Fig. 9 A schematic diagram showing the structure of a display device according to an embodiment of the present invention;

[0070] Fig.10 A flow chart showing a display method according to an embodiment of the present invention;

[0071] Fig.11 A schematic structural diagram of a computer device according to another embodiment of the present invention is shown. DETAILED DESCRIPTION

[0072] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments and accompanying drawings. Similar components in the accompanying drawings are represented by the same reference numerals. It should be understood by those skilled in the art that the content specifically described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0073] In the prior art, a natural naked-eye 3D display is realized by using an integrated imaging display of a microlens array, such as Figure 1 As shown, a layer of microlens array 2 is superimposed in front of the display element 1, and a natural 3D display 4 is formed by rendering an integrated imaging display image 3 on the display element and controlling light in all directions through the microlens array 2.

[0074] In the integrated imaging light field display system, in the display space, the information carried by the pixels on the display panel is imaged by the microlenses in the microlens array into a three-dimensional display object. In the integrated imaging light field display system, a central depth of field plane is formed at a position that satisfies the object-image relationship, and a depth of field range of the integrated imaging three-dimensional display system is formed within a certain range near the central depth of field plane, such as Figure 2 As shown, the image light emitted by the display panel 10 is imaged by the microlens array 20 into a three-dimensional display image 40 based on the central imaging plane 30, wherein the depth of field range 50 is the range marked by the ellipse in the figure.

[0075] The depth of field is an important indicator of the integrated imaging 3D display system, which indicates the spatial range in which the integrated imaging light field display system can display clear 3D images. However, the depth of field of traditional integrated imaging light field display is limited, which is far from satisfying the requirement of clearly displaying 3D images in a large spatial range. The expansion of the depth of field of the integrated imaging light field display system can improve the performance of 3D display, so that the displayed 3D images can be clearly imaged in a larger spatial range, and a larger 3D display image can be displayed on the screen, making the 3D display image more shocking.

[0076] Another way to realize light field display is through multi-focal plane display, that is, displaying on multiple parallel planes at a certain distance in space. The display content on each plane is a 2D image. The 3D effect is generated by superimposing 2D images of multiple planes to form a light field display in space. In theory, the more 2D imaging planes are formed in space, the better the light field information of the entire space can be restored. Figure 3 As shown, the human eye 60 sees a 2D image displayed by multiple parallel display screens 70 spaced a certain distance apart in space, such as display screens 71, 72, 73, 74 and 75. Due to the limitation of the number of display screens and the transmittance, this multi-focal light field display is generally realized by a single screen through time division multiplexing, and the display content of the screen is refreshed quickly, and the corresponding switching elements are quickly switched to form multiple imaging surfaces in space, which has high requirements on the refresh speed of the display elements and the switching elements. Generally, the maximum refresh rate requirement for the human eye to not feel the flicker of the picture is 30Hz. If more than 16 imaging surfaces are needed to restore the light field information, a refresh frequency of at least 16*30Hz=480Hz is required. For the light field display with a huge amount of data, the refresh speed requirement for the display elements and the switching elements is difficult to achieve. In addition, since multi-focal plane display restores the entire light field information by superimposing images on multiple 2D imaging planes, when the number of 2D screens is limited and when the human eye moves horizontally a large distance, the relative position relationship of the images superimposed on the 2D imaging planes will change, resulting in errors in the restored light field information. Therefore, the viewing angle of multi-focal plane light field display is limited.

[0077] In view of the problems existing in the prior art, such as Figure 4 As shown, an embodiment of the present invention provides a display panel, comprising a display substrate 110, a polarization switching element 200 disposed on a light-emitting side of the display substrate 110, and a microlens array 300 disposed on a side of the polarization switching element 200 away from the display substrate 100, wherein:

[0078] The display substrate 100 is used to emit image light according to an input display image signal. The display substrate includes a plurality of pixel islands 110 arranged in an array. Each pixel island 110 includes at least two sub-pixel islands. Each sub-pixel island includes a*b pixels, where a is an integer greater than or equal to 2, and b is an integer greater than or equal to 2.

[0079] The polarization switching element 200 is used to switch the polarization state according to the switching signal input according to the preset timing cycle and convert the image light into the image polarization light corresponding to the switching signal, and the display image signal is synchronized with the switching signal;

[0080] The microlens array 300 includes a plurality of microlens units corresponding one to one with the sub-pixel islands, each microlens unit has a variable focal length, and the variable focal lengths of the microlens units corresponding to each sub-pixel island in each pixel island are different, and the microlens units corresponding to each sub-pixel island in each pixel island are used to respectively image the image polarized light into three-dimensional display images based on different central imaging planes.

[0081] In this embodiment, a polarization switching element and a microlens array arranged on a display substrate are used to realize time division multiplexing and space segmentation, thereby forming a composite light field display based on microlens integrated imaging display and multi-focal plane display, thereby compensating for the problems existing in the prior art, effectively improving the display effect of naked-eye 3D, and having broad application prospects.

[0082] Specifically, the display substrate is divided into a plurality of pixel islands, each pixel island includes a plurality of sub-pixel islands, and the microlens array includes microlens units corresponding to each sub-pixel island one by one; during the display process of the display panel, in response to the synchronously input and time-division multiplexed display image signal and the switching signal, the display substrate displays image light according to the display image signal, the polarization switching element switches the polarization state according to the switching signal and converts the display image light into image polarized light, and the microlens unit is used to image the image polarized light into a three-dimensional display image based on the central imaging plane of the focal length of the microlens unit to achieve spatial segmentation, thereby forming a composite light field display based on microlens integrated imaging display and multi-focal plane display.

[0083] In a specific example, Figure 4 As shown, the preset timing cycle includes a first time slot and a second time slot, and the switching signal includes a first time slot switching signal corresponding to the first time slot and a second time slot switching signal corresponding to the second time slot.

[0084] The polarization switching element is used to switch to the first polarization state according to the first time slot switching signal and convert the image light into the first image polarized light,

[0085] The polarization switching element is used to switch to a second polarization state according to a second time slot switching signal and convert the image light into a second image polarized light, where the second image polarized light is orthogonal to the first image polarized light.

[0086] In this embodiment, time division multiplexing is achieved by splitting a preset timing cycle into a first time slot and a second time slot. Specifically, in one timing cycle:

[0087] In the first time slot, the polarization switching element is controlled to switch to the first polarization state through the first time slot switching signal, and the display substrate is controlled to emit the first image light through the synchronized display image signal in the time slot, so that the polarization switching element is controlled to convert the first image light into the first image polarization light in the first time slot;

[0088] In the second time slot, the polarization switching element is controlled to switch to the second polarization state by the second time slot switching signal, and the display substrate is controlled to emit the second image light by the synchronized display image signal in the time slot, so that the polarization switching element is controlled to convert the second image light into the second image polarization light in the second time slot;

[0089] Considering that the interaction between the first image polarized light and the second image polarized light affects the display effect of the display substrate, this embodiment controls the polarization state of the polarization switching element to control the first image polarized light and the second image polarized light to be orthogonal to each other. Specifically, when the first image polarized light is s-linear polarized light, the second image polarized light is p-linear polarized light orthogonal to the s-linear polarized light, that is, the s-linear polarized light and the p-linear polarized light do not affect each other. Alternatively, when the first image polarized light is left-handed circularly polarized light, the second image polarized light is right-handed circularly polarized light orthogonal to the left-handed circularly polarized light, that is, the left-handed circularly polarized light and the right-handed circularly polarized light do not affect each other.

[0090] In this embodiment, the input and synchronized display image signal and switching signal are utilized to control the display substrate to display image light in time-sharing, and to control the polarization switching element to switch different polarization states in time-sharing, thereby converting image light in different time slots into mutually orthogonal polarized light.

[0091] In an optional embodiment, each microlens unit includes at least two microlenses, at least one of the at least two microlenses is a variable focal length microlens, and the variable focal length microlens forms different focal lengths according to the first image polarized light and the second image polarized light with different polarization states, and images the first image polarized light and the second image polarized light into three-dimensional display images based on a central imaging plane with corresponding focal lengths, respectively.

[0092] In this embodiment, if Figure 4 As shown, each pixel island 110 includes two sub-pixel islands 111 and 112, the sub-pixel island 111 corresponds to the microlens unit 310, the microlens unit 310 includes two microlenses 311 and 312, wherein the microlens 311 is a microlens with variable focal length, and 312 is a lens with fixed focal length; the sub-pixel island 112 corresponds to the microlens unit 320, the microlens unit 320 includes two microlenses 321 and 322, wherein the microlens 321 is a microlens with variable focal length, and 322 is a lens with fixed focal length; the variable focal length microlens 311 and the variable focal length microlens 312 have different variable focal lengths, and the focal length of the microlens unit 310 is different from the focal length of the microlens unit 320.

[0093] In an optional embodiment, the variable focal length microlens is one of a liquid crystal lens, a birefringent lens, a PB lens and a metasurface lens.

[0094] Among them, the liquid crystal lens is a new type of microlens made by using electro-optical effect to change the spatial distribution of lens refractive index and microelectronic technology, and its focal length is changed by changing the spatial distribution of lens refractive index; the birefringent microlens can be a composite lens superimposed by multiple birefringent lenses, and the focal length of the composite lens can be changed by changing the polarization state of the incident light and using the change of the equivalent refractive index of its material. The PB lens changes its focal length by changing the loaded voltage or by changing the polarization state of the incident light. In practical applications, multiple PB lenses are superimposed to form a PB composite lens, and each PB lens forms a different focal length according to the loaded voltage or the polarization state of the incident light. Multiple PB lenses are coordinated to adjust to achieve variable focal length of the composite PB lens; the metasurface lens changes its focal length by changing the polarization state of the incident light. In practical applications, multiple metasurface lenses are superimposed to form a composite metasurface lens, and each metasurface lens forms a different focal length according to the polarization state of the incident light. Multiple metasurface lenses are coordinated to adjust to achieve variable focal length of the composite metasurface lens.

[0095] Still taking the above embodiment as an example for description, Figure 5 As shown,

[0096] In the first time slot:

[0097] Controlling the polarization switching element to switch to the first polarization state through the first time slot switching signal, and controlling the display substrate to emit the first image light through the synchronized display image signal in the time slot, thereby controlling the polarization switching element to convert the first image light into the first image polarization light in the first time slot;

[0098] Furthermore, the lens unit 310 corresponding to the sub-pixel island 111 generates a first focal length according to the polarized light of the first image, determines a first central imaging plane 410 with an image distance of l1 according to the first focal length, and images the polarized light of the first image into a three-dimensional display image based on the first central imaging plane 410 of the first focal length; at the same time, the lens unit 320 corresponding to the sub-pixel island 112 generates a third focal length according to the polarized light of the first image, determines a third central imaging plane 430 with an image distance of l3 according to the third focal length, and images the polarized light of the first image into a three-dimensional display image 431 based on the third central imaging plane 430 of the third focal length.

[0099] In the second time slot, the polarization switching element is controlled to switch to the second polarization state by the second time slot switching signal, and the display substrate is controlled to emit the second image light by the synchronized display image signal in the time slot, so that the polarization switching element is controlled to convert the second image light into the second image polarization light in the second time slot;

[0100] Furthermore, the lens unit 310 corresponding to the sub-pixel island 111 generates a second focal length according to the second image polarized light, determines a second central imaging plane 420 with an image distance of l2 according to the second focal length, and images the second image polarized light into a three-dimensional display image of the second central imaging plane 420 based on the second focal length; at the same time, the lens unit 320 corresponding to the sub-pixel island 112 generates a fourth focal length according to the second image polarized light, determines a fourth central imaging plane 440 with an image distance of l4 according to the fourth focal length, and images the second image polarized light into a three-dimensional display image of the fourth central imaging plane 440 based on the fourth focal length.

[0101] Specifically, in different time slots, such as Figure 5 As shown, the positions l1, l2, l3 and l4 from the first central imaging plane to the fourth central imaging plane can be calculated by the lens imaging formula.

[0102]

[0103] Where f is the focal length of the lens unit in a certain polarization state, l' is the object distance, that is, the distance between the display substrate and the principal point of the lens unit. According to the image polarization light formed by the polarization switching element in a certain polarization state, the focal length EFL (f) of the lens unit is calculated as follows:

[0104]

[0105] like Figure 6 As shown, fa is the focal length of the fixed focal length lens, fb is the focal length of the variable focal length lens in a certain polarization state, and d is the distance between the two lenses.

[0106] The back focus BFL of the lens unit (i.e., the distance B between the variable focal length lens and the focal point) is obtained by the following formula:

[0107]

[0108] Where P1 and P2 are the first and second principal plane positions of the lens unit, respectively. If the distance between the display substrate and the lens of the lens unit close to the display substrate is D, then the imaging object distance is:

[0109] l′=f-B+D

[0110] The position of the imaging surface is given by the following formula:

[0111]

[0112] The lens units corresponding to the sub-pixel islands 1 and 2 in each pixel island on the display substrate have different focal lengths in different polarization states, for example, the first focal length at the first time slot generates a first central imaging plane at a distance of l1 from the display substrate, and the third focal length generates a third central imaging plane at a distance of l3 from the display substrate, the second focal length at the second time slot generates a second central imaging plane at a distance of l2 from the display substrate, and the fourth focal length generates a fourth central imaging plane at a distance of l4 from the display substrate. Furthermore, if the first focal length, the second focal length, the third focal length and the fourth focal length are all different, then the first central imaging plane, the second central imaging plane, the third central imaging plane and the fourth central imaging plane are all different, thereby achieving the expansion of the depth of field range of the light field display system. Compared with the traditional light field display of a single central depth of field plane formed by a single microlens array, the depth of field range formed by the present application has been expanded. At the same time, since each pixel in the sub-pixel island can realize the collimation of light in various directions within a larger angle range after passing through the lens unit, the human eye can correctly perceive the superposition of images on each imaging plane when moving within a certain range. This light field display has improved viewing angle range characteristics compared with the traditional single microlens array integrated imaging light field display and the multi-focal plane light field display of 2D image superposition. At the same time, since multiple central imaging planes are formed by time division multiplexing of different time slots and spatial division of pixel islands, the refresh speed requirements for the display substrate are reduced while forming more central imaging planes.

[0113] It is worth noting that the present application does not specifically limit the focal length of the fixed-focus lens. The focal lengths of the fixed-focus lenses of the microlens units within a pixel island can be the same or different, with the different focal lengths of the microlenses within the pixel being the design criterion. Those skilled in the art should select the focal length of the fixed-focus lens according to the actual application situation, which will not be elaborated here.

[0114] In an optional embodiment, the pixels of the sub-pixel island are arranged in a polygonal shape.

[0115] In this embodiment, the pixels included in each sub-pixel island are arranged in a polygonal shape, such as Figure 7 As shown, the display substrate 100 includes a plurality of pixel islands 110, each pixel island 110 includes a plurality of sub-pixel islands, each pixel island includes four sub-pixel islands 111, 112, 113 and 114, each sub-pixel island is rectangular and includes a*b pixels 1111, wherein a is greater than or equal to 2 and b is greater than or equal to 2 to achieve light field display.

[0116] In this embodiment, the pixel island of the display substrate is divided into rectangles, each sub-pixel island corresponds to a lens unit, and the lens unit corresponding to each sub-pixel island has different focal lengths in different polarization states. Since the lens unit corresponding to each sub-pixel island has two focal lengths in two orthogonal polarization states through time division multiplexing, one pixel island corresponds to four composite lenses with two focal lengths, and the light field display device with the pixel island of the display substrate as a unit can generate 2×4=8 central imaging planes, that is, a light field display space with 8 central imaging planes is formed.

[0117] In an optional embodiment, the pixels of the sub-pixel island are arranged in a hexagonal shape.

[0118] In this embodiment, if Figure 8 As shown, the pixel island 110 includes three sub-pixel islands 115, 116 and 117, each sub-pixel island is hexagonal, including a*b pixels 1151, where a is greater than or equal to 2, and b is greater than or equal to 2 to achieve light field display. When the sub-pixel island is hexagonal, the distance between the pixel islands is smaller than that of other polygons, such as the above-mentioned rectangular arrangement, which effectively improves the imaging resolution of naked-eye 3D.

[0119] It is worth noting that, assuming that each pixel island of the display substrate includes M sub-pixel islands, and the lens unit corresponding to each sub-pixel island can produce N focal lengths through time division multiplexing, then the display panel can produce M×N central imaging planes. Those skilled in the art should understand that the division and distribution of pixel islands can be comprehensively considered by considering the refresh speed of the display substrate and the polarization switching element and the resolution of the display panel.

[0120] Based on the above display panel, an embodiment of the present application further provides a display device, comprising the above display panel, and the display device is a liquid crystal display device or an electroluminescent diode display device. The display device can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame or a navigator.

[0121] In an optional embodiment, if Fig. 9 As shown, the display device further comprises a driving unit, wherein the driving unit comprises a driving control unit and an image rendering unit, wherein

[0122] The driving control unit is used to output a switching signal to the polarization switching element of the display panel according to a preset timing cycle, and output a synchronization control signal synchronized with the switching signal to the image rendering unit;

[0123] The image rendering unit is used to output a display image signal to a display substrate of the display panel according to the synchronization control signal;

[0124] The display substrate is used to emit image light according to the display image signal;

[0125] The polarization switching element is used to switch the polarization state according to the switching signal and convert the image light into image polarized light corresponding to the switching signal;

[0126] The microlens units in the microlens array corresponding to each sub-pixel island in each pixel island are used to image the image polarization light into a three-dimensional display image based on the central imaging plane of the focal length of different microlens units.

[0127] In this embodiment, the display panel is driven by a driving unit of the display device to realize time division multiplexing and space division, and a composite light field display device integrating integrated imaging display and multi-focal plane display is formed by cooperating with a polarization switching element and a microlens unit with different variable focal lengths.

[0128] In a specific example, Fig. 9 As shown, each pixel island 110 of the display substrate 100 of the display panel includes a first sub-pixel island 111 and a second sub-pixel island 112, the microlens array 300 of the display panel includes a first microlens unit 310 corresponding to the first sub-pixel island 111 and a second microlens unit 320 corresponding to the second sub-pixel island 112, the first microlens unit 310 includes a first fixed focal length microlens 312 and a first variable focal length microlens 311, the second microlens unit 320 includes a second fixed focal length microlens 322 and a second variable focal length microlens 321, the variable focal length of the second variable focal length microlens 321 is different from the variable focal length of the first variable focal length microlens 311, and the variable focal length of the second microlens unit 320 is different from the variable focal length of the first microlens unit 310; the preset timing period includes a first time slot and a second time slot,

[0129] During the first time slot: the driving control unit outputs a first time slot switching signal to the polarization switching element of the display panel, and simultaneously outputs a first synchronization control signal to the image rendering unit; the image rendering unit outputs a first display image signal to the display substrate of the display panel according to the first synchronization control signal; the display substrate emits a first image light according to the first display image signal; the polarization switching element switches to a first polarization state according to the first time slot switching signal and converts the first image light into a first image polarized light, the first variable focal length microlens determines a first temporary focal length according to the first image polarized light, the first microlens unit determines a first focal length according to the focal length of the first fixed focal length microlens and the first temporary focal length, and images the first image polarized light into a three-dimensional display image based on a first central imaging plane of the first focal length; the second variable focal length microlens determines a second temporary focal length according to the first image polarized light, the second microlens unit determines a second focal length according to the focal length of the second fixed focal length microlens and the second temporary focal length, and images the first image polarized light into a three-dimensional display image based on a second central imaging plane of the second focal length.

[0130] During the second time slot: the driving control unit outputs a second time slot switching signal to the polarization switching element of the display panel, and outputs a second synchronization control signal to the image rendering unit at the same time; the image rendering unit outputs a second display image signal to the display substrate of the display panel according to the second synchronization control signal; the display substrate emits a second image light according to the second display image signal, and the polarization switching element switches to a second polarization state according to the second time slot switching signal and converts the second image light into a second image polarization light; the first variable focal length microlens determines a third temporary focal length according to the second image polarization light, the first microlens unit determines a third focal length according to the focal length of the first fixed focal length microlens and the third temporary focal length, and images the second image polarization light into a three-dimensional display image based on a third central imaging plane of the third focal length; the second variable focal length microlens determines a fourth temporary focal length according to the second image polarization light, the second microlens unit determines a fourth focal length according to the focal length of the second fixed focal length microlens and the fourth temporary focal length, and images the second image polarization light into a three-dimensional display image based on a fourth central imaging plane of the fourth focal length; wherein the first focal length, the second focal length, the third focal length and the fourth focal length are all different.

[0131] In this embodiment, the display substrate includes a plurality of pixel islands, each pixel island includes two sub-pixel islands, each sub-pixel island includes a plurality of pixels, the display substrate outputs image light in response to the synchronous control signal output by the image rendering unit input by the driving unit in different time slots, and cooperates with the polarization state of the polarization switching element in response to the switching signal of the different time slots output by the driving unit and synchronized with the synchronous control signal, and forms mutually orthogonal polarized light in different time slots through the polarization switching element, and then uses the variable focal length of the lens unit to form four different central imaging planes in two time slots, thereby achieving the expansion of the depth of field range of the display device. The specific implementation method refers to the aforementioned embodiment, which will not be repeated here.

[0132] Corresponding to the display device provided in the above-mentioned embodiments, an embodiment of the present application also provides a display method using the above-mentioned display device. Since the display method provided in the embodiment of the present application corresponds to the display devices provided in the above-mentioned embodiments, the previous implementation is also applicable to the display method provided in this embodiment and will not be described in detail in this embodiment.

[0133] like Fig.10 As shown, an embodiment of the present application further provides a display method using the above display device, wherein the display device further includes a driving unit, and the driving unit includes a driving control unit and an image rendering unit, including:

[0134] The driving control unit generates a switching signal and a synchronous control signal synchronized with the switching signal according to a preset timing cycle;

[0135] The driving control unit outputs the synchronization control signal to the image rendering unit, so that the image rendering unit outputs a display image signal to the display substrate of the display panel in response to the synchronization control signal, so that the display substrate emits image light in response to the display image signal;

[0136] The driving control unit outputs the switching signal to the polarization switching element, so that the polarization switching element switches the polarization state in response to the switching signal and converts the image light into image polarized light corresponding to the switching signal, so that the microlens units corresponding to each sub-pixel island in each pixel island in the microlens array respectively image the image polarized light into a three-dimensional display image based on the central imaging plane of the focal length of different microlens units.

[0137] In this embodiment, the display panel is driven by a driving unit of the display device to realize time division multiplexing and space division, and a composite light field display device integrating integrated imaging display and multi-focal plane display is formed by cooperating with a polarization switching element and a microlens unit with different variable focal lengths.

[0138] In an optional embodiment, each pixel island of the display substrate of the display panel includes a first sub-pixel island and a second sub-pixel island, the microlens array of the display panel includes a first microlens unit corresponding to the first sub-pixel island and a second microlens unit corresponding to the second sub-pixel island, the first microlens unit includes a first microlens with a fixed focal length and a first microlens with a variable focal length, the second microlens unit includes a second microlens with a fixed focal length and a second microlens with a variable focal length, the variable focal length of the second microlens with a variable focal length is different from the variable focal length of the first microlens with a variable focal length, and the variable focal length of the second microlens unit is different from the variable focal length of the first microlens with a variable focal length; the preset timing period includes a first time slot and a second time slot,

[0139] During the first time slot: the driving control unit generates a first time slot switching signal and a first synchronization control signal synchronized with the first time slot switching signal; the driving control unit outputs the first synchronization control signal to the image rendering unit, so that the image rendering unit outputs a first display image signal to the display substrate of the display panel in response to the first synchronization control signal, so that the display substrate emits a first image light in response to the first display image signal; the driving control unit outputs the first time slot switching signal to the polarization switching element, so that the polarization switching element switches to a first polarization state in response to the first time slot switching signal and converts the first image light into a first polarization state. The first image polarized light is replaced by the first image polarized light, so that the first variable focal length microlens determines a first temporary focal length according to the first image polarized light, the first microlens unit determines a first focal length according to the focal length of the first fixed focal length microlens and the first temporary focal length, and images the first image polarized light into a three-dimensional display image based on a first central imaging plane of the first focal length, so that the second variable focal length microlens determines a second temporary focal length according to the first image polarized light, the second microlens unit determines a second focal length according to the focal length of the second fixed focal length microlens and the second temporary focal length, and images the first image polarized light into a three-dimensional display image based on a second central imaging plane of the second focal length;

[0140] During the second time slot: the driving control unit generates a second time slot switching signal and a second synchronization control signal synchronized with the second time slot switching signal; the driving control unit outputs the second synchronization control signal to the image rendering unit, so that the image rendering unit outputs a second display image signal to the display substrate of the display panel in response to the second synchronization control signal, so that the display substrate emits a second image light in response to the second display image signal; the driving control unit outputs the second time slot switching signal to the polarization switching element, so that the polarization switching element switches to a second polarization state in response to the second time slot switching signal and converts the second image light into a second image polarization light, so that The first variable focal length microlens determines a third temporary focal length according to the second image polarized light, the first microlens unit determines a third focal length according to the focal length of the first fixed focal length microlens and the third temporary focal length, and images the second image polarized light into a three-dimensional display image based on a third central imaging plane of the third focal length, so that the second variable focal length microlens determines a fourth temporary focal length according to the second image polarized light, the second microlens unit determines a fourth focal length according to the focal length of the second fixed focal length microlens and the fourth temporary focal length, and images the second image polarized light into a three-dimensional display image based on a fourth central imaging plane of the fourth focal length; the first focal length, the second focal length, the third focal length and the fourth focal length are all different.

[0141] In this embodiment, the display substrate includes a plurality of pixel islands, each pixel island includes two sub-pixel islands, each sub-pixel island includes a plurality of pixels, the display substrate outputs image light in response to the synchronous control signal output by the image rendering unit input by the driving unit in different time slots, and cooperates with the polarization state of the polarization switching element in response to the switching signal of the different time slots output by the driving unit and synchronized with the synchronous control signal, and forms mutually orthogonal polarized light in different time slots through the polarization switching element, and then uses the variable focal length of the lens unit to form four different central imaging planes in two time slots, thereby achieving the expansion of the depth of field range of the display device. The specific implementation method refers to the aforementioned embodiment, which will not be repeated here.

[0142] Another embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements: the display device also includes a driving unit, the driving unit including a driving control unit and an image rendering unit, including: the driving control unit generates a switching signal according to a preset timing cycle, and a synchronization control signal synchronized with the switching signal; the driving control unit outputs the synchronization control signal to the image rendering unit, so that the image rendering unit outputs a display image signal to a display substrate of the display panel in response to the synchronization control signal, so that the display substrate emits image light in response to the display image signal; the driving control unit outputs the switching signal to the polarization switching element, so that the polarization switching element switches the polarization state in response to the switching signal and converts the image light into image polarized light corresponding to the switching signal, so that the microlens units corresponding to each sub-pixel island in each pixel island in the microlens array respectively image the image polarized light into a three-dimensional display image based on the central imaging plane of the focal length of different microlens units.

[0143] In practical applications, the computer-readable storage medium can adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present embodiment, the computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.

[0144] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0145] The program code embodied on the computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0146] Computer program code for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0147] like Fig.11 As shown, a structural schematic diagram of a computer device provided by another embodiment of the present invention. Fig.11 The computer device 12 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0148] like Fig.11 As shown, the computer device 12 is in the form of a general-purpose computing device. The components of the computer device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 that connects various system components (including the system memory 28 and the processing unit 16).

[0149] Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor or a local bus using any of a variety of bus architectures. By way of example, these architectures include, but are not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MAC) bus, an Enhanced ISA bus, a Video Electronics Standards Association (VESA) local bus, and a Peripheral Component Interconnect (PCI) bus.

[0150] The computer device 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the computer device 12, including volatile and non-volatile media, removable and non-removable media.

[0151] The system memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and / or cache memory 32. The computer device 12 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, the storage system 34 may be used to read and write non-removable, non-volatile magnetic media ( Fig.11 not shown, usually called a "hard drive"). Although Fig.11 Not shown in the figure, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk"), and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, a DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to the bus 18 via one or more data medium interfaces. The memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of the various embodiments of the present invention.

[0152] A program / utility 40 having a set (at least one) of program modules 42 may be stored, for example, in the memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. The program modules 42 generally perform the functions and / or methods of the embodiments described herein.

[0153] The computer device 12 may also communicate with one or more external devices 14 (e.g., keyboards, pointing devices, displays 24, etc.), one or more devices that enable a user to interact with the computer device 12, and / or any device that enables the computer device 12 to communicate with one or more other computing devices (e.g., network cards, modems, etc.). Such communication may be performed through an input / output (I / O) interface 22. Furthermore, the computer device 12 may also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) through a network adapter 20. Fig.11 As shown, the network adapter 20 communicates with other modules of the computer device 12 via the bus 18. It should be understood that although Fig.11 Not shown, other hardware and / or software modules may be used in conjunction with computer device 12, including but not limited to microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0154] The processor unit 16 executes various functional applications and data processing by running programs stored in the system memory 28, such as implementing a display method provided by an embodiment of the present invention.

[0155] In view of the existing problems, the present invention develops a display panel, a display device and a display method. The display panel utilizes a polarization switching element and a microlens array arranged on a display substrate to realize time division multiplexing and space division, forming a composite light field display based on microlens integrated imaging display and multi-focal plane display, thereby compensating for the problems existing in the prior art, effectively improving the display effect of naked-eye 3D, and having broad application prospects.

[0156] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A display device, characterized in that: It includes a display panel and a driving unit, wherein The display panel includes a display substrate, a polarization switching element arranged on the light-emitting side of the display substrate, and a microlens array arranged on the side of the polarization switching element away from the display substrate, wherein the display substrate is used to emit image light according to an input display image signal, the display substrate includes a plurality of pixel islands arranged in an array, each pixel island includes at least two sub-pixel islands, each sub-pixel island includes a*b pixels, wherein a is an integer greater than or equal to 2, and b is an integer greater than or equal to 2; the polarization switching element is used to switch the polarization state according to a switching signal input according to a preset timing cycle and convert the image light into image polarization light corresponding to the switching signal, and the display image signal is synchronized with the switching signal; the microlens array includes a plurality of microlens units corresponding to the sub-pixel islands one by one, the focal length of each microlens unit is variable, and the variable focal lengths of the microlens units corresponding to each sub-pixel island of each pixel island are different, The driving unit includes a driving control unit and an image rendering unit, wherein The driving control unit is used to output a switching signal to the polarization switching element of the display panel according to a preset timing cycle, and output a synchronization control signal synchronized with the switching signal to the image rendering unit; The image rendering unit is used to output a display image signal to a display substrate of the display panel according to the synchronization control signal; The microlens units in the microlens array corresponding to each sub-pixel island in each pixel island are used to respectively image the image polarized light into a three-dimensional display image based on the central imaging plane of the focal length of different microlens units; Each pixel island of the display substrate of the display panel includes a first sub-pixel island and a second sub-pixel island, the microlens array of the display panel includes a first microlens unit corresponding to the first sub-pixel island and a second microlens unit corresponding to the second sub-pixel island, the first microlens unit includes a first fixed focal length microlens and a first variable focal length microlens, the second microlens unit includes a second fixed focal length microlens and a second variable focal length microlens, the variable focal length of the second variable focal length microlens is different from the variable focal length of the first variable focal length microlens, and the variable focal length of the second microlens unit is different from the variable focal length of the first microlens unit; the preset timing period includes a first time slot and a second time slot, During the first time slot: The driving control unit is used to output a first time slot switching signal to the polarization switching element of the display panel and output a first synchronization control signal to the image rendering unit. The image rendering unit outputs a first display image signal to a display substrate of the display panel according to a first synchronization control signal. The display substrate is used to emit a first image light according to the first display image signal. The polarization switching element is used to switch to the first polarization state according to the first time slot switching signal and convert the first image light into the first image polarized light, The first variable focal length microlens is used to determine a first temporary focal length according to the first image polarized light, and the first microlens unit is used to determine a first focal length according to the focal length of the first fixed focal length microlens and the first temporary focal length, and to image the first image polarized light into a three-dimensional display image based on a first central imaging plane of the first focal length; The second variable focal length microlens is used to determine a second temporary focal length according to the first image polarized light, and the second microlens unit is used to determine a second focal length according to the focal length of the second fixed focal length microlens and the second temporary focal length, and to image the first image polarized light into a three-dimensional display image based on a second central imaging plane of the second focal length; During the second time slot: The driving control unit is used to output a second time slot switching signal to the polarization switching element of the display panel and output a second synchronization control signal to the image rendering unit. The image rendering unit is used to output a second display image signal to the display substrate of the display panel according to a second synchronization control signal. The display substrate is used to emit a second image light according to the second display image signal. the polarization switching element is used to switch to a second polarization state according to the second time slot switching signal and convert the second image light into a second image polarized light, The first variable focal length microlens is used to determine a third temporary focal length according to the second image polarized light, and the first microlens unit is used to determine a third focal length according to the focal length of the first fixed focal length microlens and the third temporary focal length, and to image the second image polarized light into a three-dimensional display image based on a third central imaging plane of the third focal length; The second variable focal length microlens is used to determine a fourth temporary focal length according to the second image polarized light, and the second microlens unit is used to determine a fourth focal length according to the focal length of the second fixed focal length microlens and the fourth temporary focal length, and to image the second image polarized light into a three-dimensional display image based on a fourth central imaging plane of the fourth focal length; The first focal length, the second focal length, the third focal length and the fourth focal length are all different.

2. The display device according to claim 1, characterized in that The second image polarization light is orthogonal to the first image polarization light.

3. The display device according to claim 2, characterized in that: The first image polarized light is s-linear polarized light, and the second image polarized light is p-linear polarized light; or The first image polarized light is left-handed circularly polarized light, and the second image polarized light is right-handed circularly polarized light.

4. The display device according to claim 1, characterized in that The first variable focal length microlens and the second variable focal length microlens are one of a liquid crystal lens, a birefringent lens, a PB lens and a metasurface lens.

5. The display device according to any one of claims 1 to 4, characterized in that: The pixels of the sub-pixel island are arranged in a polygonal manner.

6. The display device according to claim 5, characterized in that: The pixels of the sub-pixel island are arranged in a hexagonal shape.

7. A display method using the display device of claim 1, characterized in that: The display device further includes a driving unit, which includes a driving control unit and an image rendering unit, including: The driving control unit generates a switching signal and a synchronous control signal synchronized with the switching signal according to a preset timing cycle; The driving control unit outputs the synchronization control signal to the image rendering unit, so that the image rendering unit outputs a display image signal to the display substrate of the display panel in response to the synchronization control signal, so that the display substrate emits image light in response to the display image signal; The driving control unit outputs the switching signal to the polarization switching element, so that the polarization switching element switches the polarization state in response to the switching signal and converts the image light into image polarized light corresponding to the switching signal, so that the microlens units corresponding to each sub-pixel island in each pixel island in the microlens array respectively image the image polarized light into a three-dimensional display image based on a central imaging plane of a focal length of different microlens units; Each pixel island of the display substrate of the display panel includes a first sub-pixel island and a second sub-pixel island, the microlens array of the display panel includes a first microlens unit corresponding to the first sub-pixel island and a second microlens unit corresponding to the second sub-pixel island, the first microlens unit includes a first fixed focal length microlens and a first variable focal length microlens, the second microlens unit includes a second fixed focal length microlens and a second variable focal length microlens, the variable focal length of the second variable focal length microlens is different from the variable focal length of the first variable focal length microlens, and the variable focal length of the second microlens unit is different from the variable focal length of the first microlens unit; the preset timing period includes a first time slot and a second time slot, During the first time slot: The driving control unit generates a first time slot switching signal and a first synchronization control signal synchronized with the first time slot switching signal; The driving control unit outputs the first synchronization control signal to the image rendering unit, so that the image rendering unit outputs a first display image signal to a display substrate of the display panel in response to the first synchronization control signal, so that the display substrate emits a first image light in response to the first display image signal; The driving control unit outputs the first time slot switching signal to the polarization switching element, so that the polarization switching element switches to the first polarization state in response to the first time slot switching signal and converts the first image light into the first image polarized light, so that the first variable focal length microlens determines a first temporary focal length according to the first image polarized light, the first microlens unit determines a first focal length according to the focal length of the first fixed focal length microlens and the first temporary focal length, and images the first image polarized light into a three-dimensional display image based on a first central imaging plane of the first focal length, so that the second variable focal length microlens determines a second temporary focal length according to the first image polarized light, the second microlens unit determines a second focal length according to the focal length of the second fixed focal length microlens and the second temporary focal length, and images the first image polarized light into a three-dimensional display image based on a second central imaging plane of the second focal length; During the second time slot: The driving control unit generates a second time slot switching signal and a second synchronization control signal synchronized with the second time slot switching signal; The driving control unit outputs the second synchronization control signal to the image rendering unit, so that the image rendering unit outputs a second display image signal to the display substrate of the display panel in response to the second synchronization control signal, so that the display substrate emits a second image light in response to the second display image signal; The driving control unit outputs the second time slot switching signal to the polarization switching element, so that the polarization switching element switches to the second polarization state in response to the second time slot switching signal and converts the second image light into the second image polarized light, so that the first variable focal length microlens determines a third temporary focal length according to the second image polarized light, the first microlens unit determines a third focal length according to the focal length of the first fixed focal length microlens and the third temporary focal length, and images the second image polarized light into a three-dimensional display image based on a third central imaging plane of the third focal length, so that the second variable focal length microlens determines a fourth temporary focal length according to the second image polarized light, the second microlens unit determines a fourth focal length according to the focal length of the second fixed focal length microlens and the fourth temporary focal length, and images the second image polarized light into a three-dimensional display image based on a fourth central imaging plane of the fourth focal length; The first focal length, the second focal length, the third focal length and the fourth focal length are all different.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to claim 7 is implemented.

9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the method according to claim 7 is implemented.

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