Light field display device, driving method thereof and wearable equipment

Abstract

The invention discloses a light field display device, a driving method of the light field display device and wearable equipment. The light field display device and the driving method are used for achieving switching between virtual reality light field display and enhanced display light field display. The embodiment of the invention provides a light field display device. The light field display device comprises a display panel, an off-axis semi-transmitting and semi-reflecting structure located on the light emitting side of the display panel, and a display structure located on the side, away from the display panel, of the off-axis semi-transmitting and semi-reflecting structure. The display structure is used for adjusting the transmittance of the display structure to be larger than 0 so that ambient light can penetrate through the display structure to reach the off-axis semi-transmitting and semi-reflecting structure. Or the transmittance is adjusted to be 0, so that the ambient light cannot penetrate through the display structure; and / or the display structure is used for displaying a picture; the off-axis semi-transparent and semi-reflective structure is used for converging light emitted by the display panel and / or light transmitted by the display structure to human eyes.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a light field display device and a driving method thereof, and a wearable device. Background Art

[0002] In current reflective near-eye 3D display systems, the light emitted by the display panel needs to be modulated at an angle before being incident on the reflective eyepiece at different central angles, thereby forming a virtual reality (VR) optical path. However, reflective near-eye 3D display systems cannot see the real environment, and their applications are limited. Summary of the invention

[0003] The embodiments of the present application provide a light field display device and a driving method thereof, and a wearable device, which are used to realize switching between virtual reality light field display and enhanced display light field display.

[0004] An embodiment of the present application provides a light field display device, the light field display device comprising: a display panel, an off-axis semi-transmissive and semi-reflective structure located on a light-emitting side of the display panel, and a display structure located on a side of the off-axis semi-transmissive and semi-reflective structure away from the display panel;

[0005] The display structure is used to: adjust its transmittance to be greater than 0 so that ambient light can pass through the display structure to reach the off-axis semi-transmissive and semi-reflective structure; or adjust its transmittance to be 0 so that ambient light cannot pass through the display structure; and / or, the display structure is used to display images;

[0006] The off-axis semi-transmissive and semi-reflective structure is used to focus the light emitted by the display panel and / or the light transmitted by the display structure to the human eye.

[0007] In some embodiments, the display structure includes: a liquid crystal cell.

[0008] In some embodiments, the liquid crystal box includes: a first substrate and a second substrate disposed opposite to each other, a liquid crystal layer located between the first substrate and the second substrate, a first polarizer located on the first substrate away from the liquid crystal layer, and a second polarizer located on the second substrate away from the liquid crystal layer;

[0009] The first substrate comprises: a first base substrate, a first electrode layer located on a side of the first base substrate facing the liquid crystal layer, and a first alignment layer located on a side of the first electrode layer close to the liquid crystal layer; the second substrate comprises: a second base substrate, a second electrode layer located on a side of the second base substrate facing the liquid crystal layer, and a second alignment layer located on a side of the second electrode layer close to the liquid crystal layer;

[0010] The transmission axis of the first polarizer is different from the transmission axis of the second polarizer;

[0011] The orientation angle of the first orientation layer is different from the orientation angle of the second orientation layer.

[0012] In some embodiments, the transmission axis of the first polarizer is 45°, and the transmission axis of the second polarizer is 135°;

[0013] The orientation angle of the first orientation layer is 0° and the orientation angle of the second orientation layer is 90°.

[0014] In some embodiments, one of the first electrode layer and the second electrode layer includes a plurality of strip electrodes, and the other of the first electrode layer and the second electrode layer includes a surface electrode.

[0015] In some embodiments, the display structure further includes: a brightness collection structure;

[0016] The display structure is used to: in a preset display mode, adjust the transmittance of the display structure according to the brightness of the ambient light collected by the brightness collection structure.

[0017] In some embodiments, the liquid crystal cell includes a light-transmitting region and a non-light-transmitting region surrounding the light-transmitting region;

[0018] The brightness collection structure is located in the non-light-transmitting area on the side of the liquid crystal box away from the off-axis semi-transparent and semi-reflective structure; or, the brightness collection structure is located in the non-light-transmitting area on the side of the first substrate facing the liquid crystal layer; or, the brightness collection structure is located in the non-light-transmitting area on the side of the second substrate facing the liquid crystal layer.

[0019] In some embodiments, the light field display device further includes: a light control structure located between the display panel and the off-axis transflective structure;

[0020] In some embodiments, the light control structure is used to collimate and transmit the light emitted from the display panel to the off-axis semi-transmissive and semi-reflective structure.

[0021] In some embodiments, the light control structure includes a plurality of micro lenses arranged in an array.

[0022] In some embodiments, the display panel includes pixel groups corresponding one-to-one to the microlenses;

[0023] The pixel group includes n pixels, where n is an integer greater than or equal to 2;

[0024] The orthographic projection of the microlens on the display panel covers at least a portion of the area of ​​the pixel group corresponding to the microlens;

[0025] The light emitted by the pixel group passes through the microlens and reaches the off-axis semi-transmissive and semi-reflective structure to converge on the pupil of the single eye.

[0026] In some embodiments, each pixel includes multiple sub-pixel units, different sub-pixel units have different light emission colors, and each sub-pixel unit includes multiple sub-pixels with the same light emission color;

[0027] The display panel has a first light emitting plane, and different seed pixel units have different light emitting colors on the first light emitting plane;

[0028] The first light exiting plane coincides with the focal planes of the plurality of micro lenses.

[0029] An embodiment of the present application provides a driving method for a light field display device, comprising:

[0030] In the first display mode, the transmittance of the display structure is controlled to be 0, so that the light emitted by the display panel reaches the off-axis semi-transmissive and semi-reflective structure and converges to the human eye;

[0031] In the second display mode, the transmittance of the display structure is controlled to be greater than 0, so that the ambient light passes through the display structure to reach the off-axis semi-transmissive and semi-reflective structure and converges to the human eye, and the light emitted by the display panel reaches the off-axis semi-transmissive and semi-reflective structure and converges to the human eye; and / or,

[0032] In the third display mode, the display structure is controlled to display a picture.

[0033] In some embodiments, the display structure includes a brightness collection structure, and in the second display mode, controlling the transmittance of the display structure to be greater than 0 specifically includes:

[0034] The transmittance of the display structure is adjusted according to the brightness of the ambient light collected by the brightness collection structure.

[0035] A wearable device provided in an embodiment of the present application includes the light field display device provided in an embodiment of the present application.

[0036] The light field display device and its driving method, and wearable device provided in the embodiments of the present application, the light field display device includes a display structure, when the transmittance of the display structure is adjusted to 0, the ambient light cannot reach the off-axis semi-transparent and semi-reflective structure through the display structure, and the light emitted by the display panel reaches the off-axis semi-transparent and semi-reflective structure and converges to the human eye, thereby realizing virtual reality (VR) light field display. When the transmittance of the display structure is adjusted to be greater than 0, the ambient light reaches the off-axis semi-transparent and semi-reflective structure through the display structure, that is, the user can view the real environment through the light field display device, and the light emitted by the display panel reaches the off-axis semi-transparent and semi-reflective structure and converges to the human eye, which can realize augmented reality (AR) light field display. That is, the light field display device provided in the embodiment of the present disclosure can realize the switching between VR light field display and AR light field display by adjusting the transmittance of the display structure, thereby increasing the application scenarios of the light field display device and improving the user experience. The display structure is also used to display the picture, that is, the user can also watch through the display structure, further increasing the application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 A schematic diagram of the structure of a light field display device provided in an embodiment of the present application;

[0039] Figure 2 A schematic diagram of a display structure provided in an embodiment of the present application;

[0040] Figure 3 A structural schematic diagram of another display structure provided in an embodiment of the present application;

[0041] Figure 4 A structural schematic diagram of another display structure provided in an embodiment of the present application;

[0042] Figure 5 A structural schematic diagram of another display structure provided in an embodiment of the present application;

[0043] Figure 6 A structural schematic diagram of another display structure provided in an embodiment of the present application;

[0044] Figure 7 A structural schematic diagram of another display structure provided in an embodiment of the present application;

[0045] Figure 8 A schematic diagram of a light control structure provided in an embodiment of the present application;

[0046] Fig. 9 A schematic diagram of another light control structure provided in an embodiment of the present application;

[0047] Fig.10 A schematic diagram of the structure of a display panel provided in an embodiment of the present application;

[0048] Fig.11 A schematic diagram of the structure of another display panel provided in an embodiment of the present application;

[0049] Fig.12 A schematic diagram of the structure of another display panel provided in an embodiment of the present application;

[0050] Fig.13 A schematic flow chart of a driving method for a light field display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0051] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. And in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Based on the described embodiments of the present application, all other embodiments obtained by ordinary technicians in the field without creative work belong to the scope of protection of this application.

[0052] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. "First", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and other similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0053] It should be noted that the sizes and shapes of the figures in the accompanying drawings do not reflect the actual proportions, but are only intended to illustrate the content of the present application. The same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0054] The present application embodiment provides a light field display device, such as Figure 1 As shown, the light field display device comprises: a display panel 1, an off-axis semi-transmissive and semi-reflective structure 2 located on the light-emitting side of the display panel 1, and a display structure 3 located on the side of the off-axis semi-transmissive and semi-reflective structure 2 away from the display panel 1;

[0055] The display structure 3 is used to: adjust its transmittance to be greater than 0, so that ambient light can pass through the display structure 3 to reach the off-axis semi-transmissive and semi-reflective structure 2; or adjust its transmittance to be 0, so that ambient light cannot pass through the display structure 3; and / or, the display structure 3 is used to display images;

[0056] The off-axis semi-transmissive and semi-reflective structure 2 is used to focus the light emitted from the display panel 1 and / or the light transmitted through the display structure 3 to the human eye.

[0057] The light field display device provided in the embodiment of the present application includes a display structure. When the transmittance of the display structure is adjusted to 0, the ambient light cannot reach the off-axis semi-transparent and semi-reflective structure through the display structure, and the light emitted by the display panel reaches the off-axis semi-transparent and semi-reflective structure and converges to the human eye, thereby realizing virtual reality (VR) light field display. When the transmittance of the display structure is adjusted to be greater than 0, the ambient light reaches the off-axis semi-transparent and semi-reflective structure through the display structure, that is, the user can view the real environment through the light field display device, and the light emitted by the display panel reaches the off-axis semi-transparent and semi-reflective structure and converges to the human eye, which can realize augmented reality (AR) light field display. That is, the light field display device provided in the embodiment of the present disclosure can realize the switching between VR light field display and AR light field display by adjusting the transmittance of the display structure, thereby increasing the application scenarios of the light field display device and improving the user experience. The display structure is also used to display the picture, that is, the user can also watch through the display structure, further increasing the application scenarios.

[0058] In some embodiments, Figure 2 As shown, the display structure 3 includes: a liquid crystal box 301.

[0059] That is, by adjusting the rotation state of the liquid crystal molecules in the liquid crystal box, the different light transmittance of the liquid crystal box is adjusted to achieve a change in transmittance. In addition, the liquid crystal box can also be used as a display panel to display images, that is, the display structure is also used to display images, further increasing the application scenarios of the light field display device and improving the user experience. When the liquid crystal box is used as a display panel to display images, the ambient light is used as the light source for the display.

[0060] In some embodiments, Figure 2 As shown, the liquid crystal box 301 includes: a first substrate 3011 and a second substrate 3012 arranged opposite to each other, a liquid crystal layer 3013 located between the first substrate 3011 and the second substrate 3012, a first polarizer 3014 located on the first substrate 3011 away from the liquid crystal layer 3013, and a second polarizer 3015 located on the second substrate 3012 away from the liquid crystal layer 3013;

[0061] The first substrate 3011 includes: a first base substrate 30113, a first electrode layer 30111 located on the side of the first base substrate 30113 facing the liquid crystal layer 3013, and a first alignment layer 30112 located on the side of the first electrode layer 30111 close to the liquid crystal layer 3013; the second substrate 3012 includes: a second base substrate 30123, a second electrode layer 30121 located on the side of the second base substrate 30123 facing the liquid crystal layer 3013, and a second alignment layer 30122 located on the side of the second electrode layer 30121 close to the liquid crystal layer 3013;

[0062] The transmission axis of the first polarizer 3014 is different from the transmission axis of the second polarizer 3015;

[0063] The orientation angle of the first orientation layer 30112 is different from the orientation angle of the second orientation layer 30122.

[0064] In a specific implementation, the voltage applied to the first electrode layer and the second electrode layer is adjusted to adjust the rotation state of the liquid crystal molecules, thereby adjusting the phase change of polarized light passing through the liquid crystal layer, so that different light transmittances can be adjusted.

[0065] In some embodiments, the liquid crystal cell is, for example, a TN type liquid crystal cell.

[0066] In some embodiments, the transmission axis of the first polarizer 3014 is 45°, and the transmission axis of the second polarizer 3015 is 135°;

[0067] The orientation angle of the first orientation layer 30112 is 0° and the orientation angle of the second orientation layer 30122 is 90°.

[0068] In a specific implementation, for a TN type liquid crystal box, when the first electrode layer and the second electrode layer are in an unpowered state, natural light passing through the first polarizer is 45° linearly polarized light, and this linearly polarized light passes through the liquid crystal layer. Since the polarization direction has an angle with the liquid crystal orientation direction, this linearly polarized light undergoes a phase change after passing through the liquid crystal layer. When the material and thickness of the liquid crystal layer meet the phase requirement of 1 / 2 wavelength, the 45° linearly polarized light becomes 135° linearly polarized light, and is emitted from the second polarizer. The transmittance of the liquid crystal box is greater than 0, and the transmittance is maximum. When the first electrode layer and the second electrode layer are powered on, state, the transmittance of the liquid crystal box can be reduced. The liquid crystal is affected by the vertical electric field. When all the liquid crystal molecules are perpendicular to the plane of the liquid crystal box, when 45° linear polarized light passes through the liquid crystal layer, no phase change occurs. The 45° linear polarized light reaches the second polarizer and is absorbed by the second polarizer. The light cannot be emitted, and the transmittance of the liquid crystal box is 0. When different voltages are applied to the first electrode layer and the second electrode layer, the rotation state of the liquid crystal molecules is adjusted, and then the phase change of the polarized light passing through the liquid crystal layer is adjusted. Different light transmittances can be adjusted, so that the liquid crystal box has different transmittances.

[0069] In some embodiments, Figure 2 , Figure 3 As shown, one of the first electrode layer 30111 and the second electrode layer 30121 includes a plurality of strip electrodes 12, and the other of the first electrode layer 30111 and the second electrode layer 30121 includes a surface electrode 13. It should be noted that: Figure 2 In the description, an example is taken in which the first electrode layer 30111 includes a plurality of strip electrodes 12 and the second electrode layer 30121 includes a surface electrode 13. Figure 3In the figure, an example is taken in which the second electrode layer 30121 includes a plurality of strip electrodes 12 and the first electrode layer 30111 includes a surface electrode 13.

[0070] In some embodiments, the light field display device further includes a driving unit, which is electrically connected to the first electrode layer and the second electrode layer of the liquid crystal cell, so that the first electrode layer and the second electrode layer can be powered by the driving unit.

[0071] In some embodiments, the liquid crystal box includes a plurality of sub-pixel units, the first electrode layer includes sub-electrodes corresponding to the sub-pixel units one by one, and the first substrate further includes thin film transistors corresponding to the sub-pixel units one by one and located between the first base substrate and the first electrode layer. The drain of the thin film transistor is electrically connected to the sub-electrode. The drive unit is electrically connected to the plurality of thin film transistors. The second electrode layer can still be a planar electrode.

[0072] In some embodiments, Figures 4 to 6 As shown, the display structure 3 further includes: a brightness collection structure 302;

[0073] The display structure 3 is used to adjust the transmittance of the display structure 3 according to the brightness of the ambient light collected by the brightness collection structure 302 in a preset display mode.

[0074] It should be noted that in the scene where the ambient light enters the human eye, the maximum brightness that the display panel can provide is limited due to the difference in brightness under different environments. The light field display device provided in the embodiment of the present application, because the display structure includes a brightness collection structure, collects the brightness of the ambient light in real time, and adjusts the transmittance of the display structure by comparing the brightness of the ambient light with the display brightness, can achieve a good fusion of virtual and reality in the AR scene.

[0075] In some embodiments, Figure 4 As shown, the liquid crystal cell 301 includes a light-transmitting area 301 - 1 and a non-light-transmitting area 301 - 2 surrounding the light-transmitting area 301 - 1;

[0076] The brightness collection structure 302 is located in the non-light-transmitting area 301 - 2 on a side of the liquid crystal cell 301 away from the off-axis transflective structure 2 .

[0077] In the light field display device provided in the embodiment of the present application, the brightness collection structure is located on the side of the liquid crystal box away from the off-axis semi-transmissive and semi-reflective structure, which can improve the accuracy of ambient light brightness collection.

[0078] Or, in some embodiments, Figure 5 As shown, the brightness collection structure 302 is located in the non-light-transmitting area 301-2 on the side of the first substrate 30113 facing the liquid crystal layer 3013. That is, the manufacture of the brightness collection structure can be integrated with the manufacture of the first substrate, which is conducive to saving process flow and cost.

[0079] Or, in some embodiments, Figure 6 As shown, the brightness collection structure 302 is located in the non-light-transmitting area 301-2 on the side of the second substrate 30123 facing the liquid crystal layer 3013. That is, the manufacture of the brightness collection structure can be integrated with the manufacture of the second substrate, which is conducive to saving process flow and cost.

[0080] It should be noted that Figures 4 to 6 In the example, the brightness collection structure 302 is located in the non-light-transmitting area 301-2 on one side of the light-transmitting area 301-1. In specific implementation, the brightness collection structure can also be set in the other non-light-transmitting areas.

[0081] In a specific implementation, for example, the brightness collection structure is electrically connected to the driving unit, and the driving unit is also used to obtain the display brightness of the display panel, and compare the brightness information collected by the brightness collection structure with the display brightness of the display panel to determine the voltage applied to the first electrode layer and the second electrode layer.

[0082] In some embodiments, Figure 7 As shown, the brightness collection structure 302 includes at least one photosensitive sensor 302 - 1 .

[0083] It should be noted that Figure 7 In the embodiment, a brightness acquisition structure including multiple photosensors is used as an example to illustrate that it is more conducive to improving the accuracy of ambient light brightness acquisition.

[0084] In a specific implementation, for example, the average value of brightness acquired by multiple photosensitive sensors can be used as the current environment brightness.

[0085] In a specific implementation, when the brightness collection structure is located on the side of the first base substrate facing the liquid crystal layer, one of the electrodes of the photosensor can be set on the same layer as the first electrode layer; when the brightness collection structure is located on the side of the second base substrate facing the liquid crystal layer, one of the electrodes of the photosensor can be set on the same layer as the second electrode layer.

[0086] In a specific implementation, the area occupied by the brightness collection structure is, for example, greater than or equal to 600 square microns and less than or equal to 900 square microns, and the size of each of the multiple photosensors included in the brightness collection structure is, for example, 30 microns.

[0087] In some embodiments, Figure 1 As shown, the off-axis transflective structure 2 includes: a first curved surface 201 facing the human eye 6 and a second curved surface 202 facing the display structure 3. The light emitted by the display panel 1 reaches the first curved surface 201 and converges to the human eye 6; the ambient light passes through the display structure 3 and reaches the second curved surface 202 and converges to the human eye 6.

[0088] In some embodiments, Figure 1 As shown, the first curved surface 201 and the second curved surface 202 are both curved surfaces that are convex toward one side of the display structure.

[0089] It should be noted that the distance between the display structure and the second curved surface can be 0, so that the size of the light field display device can be reduced. Of course, in order to facilitate assembly, the distance between the display structure and the second curved surface can also be greater than 0. The required distance between the display structure and the second curved surface can be selected according to the actual assembly difficulty, etc.

[0090] In some embodiments, Figure 1 As shown, the light field display device further includes: a light control structure 4 located between the display panel 1 and the off-axis semi-transmissive and semi-reflective structure 2;

[0091] The light control structure 4 is used to collimate and transmit the light emitted from the display panel 1 to the off-axis semi-transmissive and semi-reflective structure 2 .

[0092] In the light field display device provided by the embodiment of the present application, the light emitted by the display panel passes through the light control structure and is collimated to be incident on the first curved surface of the off-axis semi-transparent and semi-reflective structure. In this way, the light spots formed by the light emitted from each position of the display panel and reaching the off-axis semi-transparent and semi-reflective structure are smaller in size, and the light spots formed by the light emitted from different positions of the display panel and reaching the off-axis semi-transparent and semi-reflective structure do not overlap each other. Since the light spots formed at different positions on the off-axis semi-transparent and semi-reflective structure do not interfere with each other, the field of view angles of different light spots reaching the human eye after being reflected by the off-axis semi-transparent and semi-reflective structure do not affect each other, which can reduce the difficulty of the surface design of the off-axis semi-transparent and semi-reflective structure, improve the modulation transfer function (MTF), and improve the imaging quality.

[0093] In some embodiments, Figure 1 As shown, the light control structure 4 includes a plurality of micro lenses 401 arranged in an array.

[0094] In some embodiments, Figure 8 As shown, the microlens 401 includes: a third curved surface 40111 convex toward the display panel 1 .

[0095] In the display device provided by the embodiment of the present application, the microlens has a curved surface facing the display panel, so that the microlens can collimate the light with a divergence angle emitted from the display panel.

[0096] In specific implementation, Figure 8 As shown, the microlens 401 is a ball lens;

[0097] The third curved surface 40111 of the ball lens 4011 faces the display panel 1 .

[0098] Or, in some embodiments, Fig. 9 As shown, the microlens 401 includes a first cylindrical lens 4012 and a second cylindrical lens 4013 that are stacked; the extension directions of the first cylindrical lens 4012 and the second cylindrical lens 4013 intersect, so that the two stacked cylindrical lenses can function as a ball lens; for example, the extension directions of the first cylindrical lens 4012 and the second cylindrical lens 4013 are perpendicular;

[0099] The curved surface areas of the first cylindrical lens 4012 and the second cylindrical lens 4013 face the display panel (not shown).

[0100] In some embodiments, Figure 8 As shown, the light control structure 4 also includes:

[0101] The third substrate 402 ; the micro lens 401 is located on a side of the third substrate 402 facing the display panel 1 .

[0102] In some embodiments, Figure 8 As shown, the light control structure 4 further includes: a first planarization layer 403, located between the microlens 401 and the display panel 1. The first planarization layer is used to planarize the plurality of microlenses.

[0103] In a specific implementation, for example, a plurality of micro lenses can be formed on one side of the third substrate by an injection molding process. The material of the micro lenses can be, for example, polyethylene glycol terephthalate (PET). The third substrate can be, for example, a glass substrate. Alternatively, the material of the third substrate can also include polymethyl methacrylate (PMMA).

[0104] In a specific implementation, the first planarization layer is used to planarize the plurality of micro lenses.

[0105] In a specific implementation, the light field display device further includes: bonding glue located between the light control structure and the display panel, that is, the light control structure and the display panel are bonded by optical glue.

[0106] In some embodiments, the first planarization layer is bonded to the display panel through optical adhesive. The material of the first planarization layer may be, for example, an organic material, and the organic material may be, for example, organic silicon (OCR). Alternatively, the optical adhesive may be reused as the first planarization layer, that is, the first planarization layer does not need to be additionally provided, and the plurality of microlenses are flattened and bonded to the display panel through the optical adhesive.

[0107] In some embodiments, the difference between the refractive index of the microlens and the refractive index of the first flat layer is less than or equal to 0.2, that is, the difference between the refractive index of the microlens and the first flat layer is small, thereby preventing the light from being refracted at a large angle.

[0108] In a specific implementation, for example, the refractive index of the microlens is greater than or equal to 1.5 and less than or equal to 1.9. The refractive index of the commonly used microlens material is 1.55 or 1.62, and the refractive index of the first flat layer is, for example, 1.42.

[0109] In some embodiments, the display panel includes pixel groups corresponding one-to-one to the microlenses;

[0110] The pixel group includes n pixels, where n is an integer greater than or equal to 2;

[0111] The orthographic projection of the microlens on the display panel covers at least a portion of the area of ​​the pixel group corresponding to the microlens;

[0112] The light emitted by the pixel group passes through the microlens and reaches the off-axis semi-transmissive and semi-reflective structure to converge on the pupil of the single eye.

[0113] It should be noted that the light field display device provided in the embodiment of the present application is a three-dimensional (3D) light field display device based on light field display. Light field display can realize a true 3D scene like the real world. Generally, a light beam with a known direction is called a light field in space, referred to as a light field. In the light field, the light beam entering the pupil needs to have an intersection in space to form an image. One pixel represents a light ray, corresponding to one viewpoint. In order to realize the light field display, the pupil of a single eye needs to receive at least two viewpoints at the same time. The light emitted by this pixel propagates to the pupil position to form a viewing area, so that the depth of field plane of the single eye can be adjusted. The clear and blurred transformation of different depths of field planes can be achieved by focusing the human eye lens, so that the focus of the single eye and the convergence of both eyes on the same plane can be achieved, avoiding the human eye from perceiving the convergence conflict and causing visual fatigue.

[0114] In specific implementation, different viewpoints are incident on different positions of the pupil, and different viewpoints form intersections in space, thereby forming different depths of field planes. A single eye can focus on different depths of field planes according to different convergence angles to avoid focusing and convergence conflicts between the two eyes. At the same time, different image renderings can be adjusted according to the focusing state of the human eye to achieve switching between different depths of field planes.

[0115] In some embodiments, the number of pixels included in the pixel group is less than or equal to 30. That is, n is greater than or equal to 2 and less than or equal to 30.

[0116] Furthermore, in order to achieve multi-viewpoint display to improve display effect, n can be set to be greater than or equal to 4 and less than or equal to 30.

[0117] In some embodiments, light emitted from the i-th pixel of multiple pixel groups passes through the light control structure and reaches the first curved surface, and then converges to the same position of the human eye at different angles; wherein i is an integer greater than or equal to 1 and less than or equal to n.

[0118] In a specific implementation, the angles at which the i-th pixel of the plurality of pixel groups reaches the first curved surface after passing through the light control structure are different.

[0119] It should be noted that any area where different light rays converge on the pupil of a single eye can be considered as the same area where the light rays converge on the human eye.

[0120] It should be noted that each pixel group includes n pixels, that is, each pixel group corresponds to n views (1st to nth), and the display panel can be considered to correspond to n views. The i-th views corresponding to multiple pixel groups have the same eye-entry position, but different i-th views have different eye-entry angles.

[0121] In a specific implementation, a pixel includes, for example, three sub-pixel units, and the three sub-pixel units are, for example, a red sub-pixel unit, a blue sub-pixel unit, and a green sub-pixel unit.

[0122] In a specific implementation, the red sub-pixel unit includes red sub-pixels, the blue sub-pixel unit includes blue sub-pixels, and the green sub-pixel unit includes green sub-pixels.

[0123] In some embodiments, the pixel includes, for example, three sub-pixel units arranged in a triangle, that is, the three sub-pixel units are arranged in rows, one row includes one sub-pixel unit, and the other row includes two sub-pixel units, and the two sub-pixel units are arranged in a staggered manner. In some embodiments, the sub-pixel unit includes only one sub-pixel. In some embodiments, the shape of the sub-pixel is a hexagon.

[0124] Of course, the sub-pixel units included in the pixel may also be arranged in other ways, and the sub-pixels may also be in other shapes.

[0125] Alternatively, in some embodiments, each sub-pixel unit includes a plurality of sub-pixels with the same light emission color. Each sub-pixel unit includes a plurality of sub-pixels arranged along a first direction X. The pixels are arranged in an array along the first direction X and a second direction Y, for example. The second direction Y is, for example, perpendicular to the first direction X. Figure 3 For example, the third direction Z is perpendicular to the plane where the second direction Y (not shown) and the first direction X are located.

[0126] In some embodiments, the display panel is an electroluminescent display panel.

[0127] In some embodiments, when the display panel is an electroluminescent display panel, the sub-pixel includes a light emitting device.

[0128] In a specific implementation, the light emitting device may be, for example, an organic light emitting diode (OLED), a quantum dot light emitting diode (QLED), a micro inorganic light emitting diode (micro LED), or a mini light emitting diode (mini LED). That is, the electroluminescent display panel may be, for example, an organic light emitting diode (OLED) display panel, a quantum dot light emitting diode (QLED) display panel, a micro inorganic light emitting diode (micro LED) display panel, or a mini light emitting diode (mini LED) display panel.

[0129] In specific implementation, Fig.10 As shown, the light emitting device 5 includes an anode 501 , a light emitting layer 502 , and a cathode 503 which are stacked.

[0130] In a specific implementation, a hole injection layer, a hole transport layer, etc. may be included between the anode and the light-emitting layer, and an electron injection layer, an electron transport layer, etc. may be included between the cathode and the light-emitting layer.

[0131] In some embodiments, Fig.11 As shown, the display panel 1 further includes:

[0132] A fourth substrate 101;

[0133] The driving circuit layer 102 is located between the fourth base substrate 101 and the light emitting device 5;

[0134] The encapsulation layer 107 is located on the side of the light emitting device 5 facing the imaging structure (not shown), that is, on the side of the light emitting device 5 facing away from the fourth substrate 101, including a first inorganic encapsulation layer 1071 and a second inorganic encapsulation layer 1072 stacked in sequence on the side of the light emitting device 5 facing the imaging structure (that is, the side of the light emitting device 5 facing away from the fourth substrate 101);

[0135] The second planarization layer 108 is located on a side of the second inorganic encapsulation layer 1072 away from the first inorganic encapsulation layer 1071 .

[0136] In specific implementation, the encapsulation layer is used to protect the light emitting device to prevent water and oxygen from corroding the light emitting layer of the light emitting device. The material of the first inorganic encapsulation layer is, for example, silicon nitride, and the material of the second inorganic encapsulation layer is, for example, aluminum oxide.

[0137] In the specific implementation, take the OLED display panel as an example. Fig.10As shown, the driving circuit layer 102 includes, for example, a thin film transistor TFT, and may also include a capacitor (not shown). The thin film transistor TFT includes: an active layer 1021, a gate G, a source S, and a drain D. In a specific implementation, the thin film transistor included in the driving circuit layer includes at least a driving transistor, and the drain D of the driving transistor is electrically connected to the anode 501 of the light emitting device 5. The material of the active layer may include, for example, silicon or an oxide semiconductor. The gate, source, and drain include, for example, metal materials.

[0138] In specific implementation, Fig.10 As shown, the thin film transistor TFT is a top gate structure, that is, the gate G is located on the side of the active layer 1021 away from the fourth base substrate 101; the display panel 1 also includes: a buffer layer 103 located between the fourth base substrate 101 and the active layer 1021, a gate insulating layer 104 located between the active layer 1021 and the gate G, an interlayer insulating layer 105 located between the gate G and the source S and the drain D, and a third planarization layer 106 located between the source S and the drain D and the anode 501.

[0139] In the specific implementation, take the OLED display panel as an example. Fig.10 As shown, the display panel further includes a pixel definition layer 109 located on the side of the third planarization layer 106 away from the fourth base substrate 101. The pixel definition layer 109 has a first opening area 1091, and the pixel definition layer 109 covers the edge of the anode 501. The orthographic projection of the first opening area 1091 on the fourth base substrate 101 falls into the anode 501. The anode 501, the light-emitting layer 502, and the first opening area 1091 of the cathode 503 are stacked to form a light-emitting device.

[0140] In some embodiments, in a pixel, the light-emitting devices corresponding to the sub-pixels of different sub-pixel units have different light-emitting colors. The light-emitting color of the light-emitting device corresponds to the light-emitting color of the sub-pixel where the light-emitting device is located. The light-emitting device included in the red sub-pixel emits red light, the light-emitting device included in the blue sub-pixel emits blue light, and the light-emitting device included in the green sub-pixel emits green light.

[0141] Or, in some embodiments, Fig.11 As shown, the sub-pixel further includes: a color filter 8.

[0142] In a specific implementation, for an electroluminescent display panel, the color filter is located on the side of the light emitting device away from the fourth substrate. Fig.11 As shown, when the display panel includes the encapsulation layer 107 , the color filter 8 is located on a side of the encapsulation layer 107 away from the light emitting device 5 .

[0143] In a specific implementation, sub-pixels of different sub-pixel units correspond to color filters of different colors. The light-emitting color of the color filter corresponds to the light-emitting color of the sub-pixel where the color filter is located. The red sub-pixel includes a red color filter, the blue sub-pixel includes a blue color filter, and the green sub-pixel includes a green color filter.

[0144] In a specific implementation, the light emitting devices included in each sub-pixel in the display panel have the same color. Color conversion is achieved through the color filter to perform full-color display. For example, the light emitting devices included in each sub-pixel in the display panel emit white light. Alternatively, the light emitting devices included in each sub-pixel in the display panel may emit blue light.

[0145] In some embodiments, the display panel further includes a first protective layer covering the color film.

[0146] Alternatively, in some embodiments, the display panel may also be a liquid crystal display panel (LCD).

[0147] In some embodiments, Fig.12 As shown, the sub-pixels include:

[0148] Color filter 8; the light emission color of the color filter 8 corresponds to the color of the sub-pixel;

[0149] Thin film transistor TFT, located on the side of the color film 8 away from the micro lens (not shown);

[0150] The pixel electrode 9 is located between the thin film transistor TFT and the color filter 8 .

[0151] In a specific implementation, when the display panel is a liquid crystal display panel, such as Fig.12 As shown, the display panel specifically includes: an array substrate 112 and an opposing substrate 113 that are arranged opposite to each other, and a liquid crystal layer 114 located between the array substrate 112 and the opposing substrate 113. The array substrate 112 includes: a thin film transistor TFT, and a pixel electrode 9; the opposing substrate 113 includes a color filter 8. The array substrate 112 also includes: a fourth base substrate 101, and the thin film transistor TFT is located between the fourth base substrate 101 and the pixel electrode 9; the opposing substrate 113 also includes: a fifth base substrate 1132, and a black matrix 1131 located on the side of the fifth base substrate 1132 facing the liquid crystal layer 114, the black matrix 1131 includes a second opening, and the second opening is the opening area corresponding to the sub-pixel, and the color filter 8 includes a portion located in the second opening. Fig.12 In the figure, the common electrode 115 is located on the array substrate 112 as an example for illustration. Of course, the common electrode 115 may also be located on the opposite substrate 113.

[0152] In specific implementation, Fig.12As shown, the thin film transistor TFT is a top gate structure, that is, the gate G is located on the side of the active layer 1021 away from the fourth base substrate 101; the array substrate 112 also includes: a buffer layer 103 located between the fourth base substrate 101 and the active layer 1021, a gate insulating layer 104 located between the active layer 1021 and the gate G, an interlayer insulating layer 105 located between the gate G and the source S and the drain D, and a third planarization layer 106 located between the source S and the drain D and the pixel electrode 9, a second protective layer 1122 located between the pixel electrode 9 and the common electrode 11, and a third protective layer 1123 located between the common electrode 11 and the liquid crystal layer 114.

[0153] In some embodiments, when the display panel is a liquid crystal display panel, the display device further includes: a backlight module located on a side of the display panel away from the imaging structure. The backlight module includes a backlight source, which is, for example, an electroluminescent device.

[0154] It should be noted that the display device needs to store preset light field mapping rules that match the various parameters of the display device, so that the display panel display image corresponding to the 3D image to be displayed can be obtained. For example, in a specific implementation, a light field database is established based on the coordinate information of the off-axis reflection structure, the light control structure, and the coordinate information of the display panel pixels to obtain light field information matching the display device, wherein one pixel represents a ray of light, and one ray of light corresponds to one viewpoint. When determining the display panel display image corresponding to the 3D image to be displayed, the depth of field surface to be displayed and the light field of the space are intersected in combination with the light field information database, and the pixels on the display panel are determined according to the mapping relationship to obtain the light field rendering image of the depth of field surface, and the rendered light field images of each depth of field surface are superimposed together, and the corresponding display information is given to drive the pixels to emit light, so that through the light control structure and the off-axis semi-transparent and semi-reflective structure, the 3D scene that the human eye can focus and watch like the real world can be restored.

[0155] In some embodiments, each pixel includes multiple sub-pixel units, different sub-pixel units have different light emission colors, and each sub-pixel unit includes multiple sub-pixels with the same light emission color;

[0156] The display panel has a first light emitting plane, and different seed pixel units have different light emitting colors on the first light emitting plane;

[0157] The first light exiting plane coincides with the focal planes of the plurality of micro lenses.

[0158] It should be noted that if Fig.11 , Fig.12 As shown, when the display panel includes a color film 8, the first light emitting plane 7 is the light emitting surface of the color film 8. Fig.10 As shown, when the electroluminescent display panel does not include a color filter, the first light emitting plane 7 is the light emitting surface of the light emitting layer 502 .

[0159] In a specific implementation, light emitted from different positions of the display panel is deflected into the eye through the imaging structure and the first curved surface, and the light deflection at different positions of the first curved surface corresponds to the position of the display panel. In order to make the light of the same viewpoint enter the eye at the same position but at different angles, the first curved surface of the off-axis semi-transparent and semi-reflective structure can be simulated and optimized to obtain the required surface shape of the first curved surface, and the required light output angle of the display panel is calculated based on the surface shape of the first curved surface of the off-axis semi-transparent and semi-reflective structure.

[0160] In some embodiments, the surface shape of the first curved surface is the same as the surface shape of the second curved surface. For example, the surface shape of the first curved surface and the surface shape of the second curved surface are both xy polynomial free-form surface shapes. That is, the first curved surface and the second curved surface satisfy the following formula:

[0161]

[0162] Among them, C is the curvature, K is the conic coefficient, and A is the coefficient of each polynomial.

[0163] That is, the first curved surface and the second curved surface of the off-axis semi-transmissive and semi-reflective structure can be simulated and optimized to obtain the xy polynomial free-form surface shape.

[0164] In some embodiments, the light field display device includes: two display panels corresponding to the left eye and the right eye, two off-axis transflective structures corresponding to the left eye and the right eye, and two light control structures corresponding to the left eye and the right eye. The light field display device may include one display structure corresponding to the left eye and the right eye, or may include two display structures corresponding to the left eye and the right eye.

[0165] That is, in a specific implementation, a group of display panels, light control structures, and off-axis semi-transparent and semi-reflective structures correspond to the left eye or the right eye. In a specific implementation, the display panel and the light control structure can be arranged above the human eye and the off-axis semi-transparent and semi-reflective structure. For a group of display panels, light control structures, and off-axis semi-transparent and semi-reflective structures, the center of the plane where the display panel is located, the center of the plane where the light control structure is located, the optical axis of the off-axis semi-transparent and semi-reflective structure, and the center of the monocular pupil corresponding to each structure of the group are located in the same plane, and the plane is perpendicular to the binocular arrangement direction.

[0166] In a specific implementation, the two display panels display the same picture.

[0167] In a specific implementation, the two display panels have the same parameters such as composition and size, the two light control structures have the same parameters such as composition and size, and the two off-axis transflective structures have the same parameters such as composition and size. The positional relationship between the display panel, light control structure, and off-axis transflective structure corresponding to the left eye is the same as the positional relationship between the display panel, light control structure, and off-axis transflective structure corresponding to the right eye.

[0168] Based on the same inventive concept, the embodiment of the present application also provides a driving method of a light field display device, such as Fig.13 As shown, including:

[0169] S101, in a first display mode, controlling the transmittance of the display structure to be 0, so that light emitted from the display panel reaches the off-axis semi-transmissive and semi-reflective structure and converges to human eyes;

[0170] S102, in the second display mode, controlling the transmittance of the display structure to be greater than 0, so that the ambient light passes through the display structure to reach the off-axis semi-transmissive and semi-reflective structure and converges to the human eye, and the light emitted by the display panel reaches the off-axis semi-transmissive and semi-reflective structure and converges to the human eye; and / or,

[0171] S103. In the third display mode, control the display structure to display a picture.

[0172] In some embodiments, the display structure includes a brightness collection structure, and in the second display mode, controlling the transmittance of the display structure to be greater than 0 specifically includes:

[0173] The transmittance of the display structure is adjusted according to the brightness of the ambient light collected by the brightness collection structure.

[0174] In some embodiments, the display structure also includes a liquid crystal box, which includes a first electrode layer and a second electrode layer; the light field display device also includes a driving unit; the driving unit does not apply a voltage to the first electrode layer and the second electrode layer, and the transmittance of the display structure is maximum. The driving unit does not apply a voltage to the first electrode layer and the second electrode layer to control the transmittance of the display structure to 0, or controls the transmittance of the display structure to be greater than 0 and less than the maximum transmittance.

[0175] In some embodiments, for example, the brightness collection structure is electrically connected to the driving unit, and the driving unit is also electrically connected to the display panel; the driving method further includes:

[0176] Get the display brightness of the display panel;

[0177] The transmittance of the display structure is adjusted according to the brightness of the ambient light collected by the brightness collection structure, specifically including:

[0178] The brightness information collected by the brightness collection structure is compared with the display brightness of the display panel to determine the voltage applied to the first electrode layer and the second electrode layer.

[0179] A wearable device provided in an embodiment of the present application includes the light field display device provided in an embodiment of the present application.

[0180] In a specific implementation, the off-axis semi-transmissive and semi-reflective structure is used as an eyepiece of a wearable device, for example.

[0181] The wearable device provided in the embodiment of the present application is: any wearable product or component with display function, such as a wearable helmet and wearable glasses. Other essential components of the wearable device should be understood by ordinary technicians in the field, and will not be repeated here, nor should they be used as limitations on the present application. The implementation of the wearable device can refer to the embodiment of the light field display device mentioned above, and the repeated parts will not be repeated.

[0182] In summary, the light field display device and its driving method, and the wearable device provided by the embodiment of the present application, the light field display device includes a display structure. When the transmittance of the display structure is adjusted to 0, the ambient light cannot reach the off-axis semi-transparent and semi-reflective structure through the display structure, and the light emitted by the display panel reaches the off-axis semi-transparent and semi-reflective structure and converges to the human eye, thereby realizing virtual reality (VR) light field display. When the transmittance of the display structure is adjusted to be greater than 0, the ambient light reaches the off-axis semi-transparent and semi-reflective structure through the display structure, that is, the user can view the real environment through the light field display device, and the light emitted by the display panel reaches the off-axis semi-transparent and semi-reflective structure and converges to the human eye, which can realize augmented reality (AR) light field display. That is, the light field display device provided by the embodiment of the present disclosure can realize the switching between VR light field display and AR light field display by adjusting the transmittance of the display structure, thereby increasing the application scenarios of the light field display device and improving the user experience. The display structure is also used to display the picture, that is, the user can also watch through the display structure, further increasing the application scenarios.

[0183] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0184] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A light field display device, characterized in that: The light field display device comprises: a display panel, an off-axis semi-transmissive and semi-reflective structure located on a light-emitting side of the display panel, and a display structure located on a side of the off-axis semi-transmissive and semi-reflective structure away from the display panel; The display structure is used to: adjust its transmittance to be greater than 0 so that ambient light can pass through the display structure to reach the off-axis semi-transmissive and semi-reflective structure; or adjust its transmittance to be 0 so that ambient light cannot pass through the display structure; and / or, the display structure is used to display images; The off-axis semi-transmissive and semi-reflective structure is used to focus the light emitted by the display panel and / or the light transmitted by the display structure to the human eye.

2. The light field display device according to claim 1, characterized in that: The display structure includes: a liquid crystal box.

3. The light field display device according to claim 2, characterized in that: The liquid crystal box comprises: a first substrate and a second substrate arranged opposite to each other, a liquid crystal layer located between the first substrate and the second substrate, a first polarizer located on the first substrate away from the liquid crystal layer, and a second polarizer located on the second substrate away from the liquid crystal layer; The first substrate comprises: a first base substrate, a first electrode layer located on a side of the first base substrate facing the liquid crystal layer, and a first alignment layer located on a side of the first electrode layer close to the liquid crystal layer; the second substrate comprises: a first base substrate, a second electrode layer located on a side of the first base substrate facing the liquid crystal layer, and a second alignment layer located on a side of the second electrode layer close to the liquid crystal layer; The transmission axis of the first polarizer is different from the transmission axis of the second polarizer; The orientation angle of the first alignment layer is different from the orientation angle of the second alignment layer.

4. The light field display device according to claim 3, characterized in that: The transmission axis of the first polarizer is 45°, and the transmission axis of the second polarizer is 135°; The orientation angle of the first orientation layer is 0° and the orientation angle of the second orientation layer is 90°.

5. The light field display device according to claim 3 or 4, characterized in that: One of the first electrode layer and the second electrode layer includes a plurality of strip electrodes, and the other of the first electrode layer and the second electrode layer includes a surface electrode.

6. The light field display device according to any one of claims 2 to 4, characterized in that: The display structure further includes: a brightness acquisition structure; The display structure is used to: in the preset display mode, adjust the transmittance of the display structure according to the brightness of the ambient light collected by the brightness collection structure.

7. The light field display device according to claim 6, characterized in that: The liquid crystal cell comprises a light-transmitting area and a non-light-transmitting area surrounding the light-transmitting area; The brightness collection structure is located in the non-light-transmitting area on a side of the liquid crystal box away from the off-axis semi-transmitting and semi-reflective structure; or, the brightness collection structure is located in the non-light-transmitting area on a side of the first substrate facing the liquid crystal layer; or, the brightness collection structure is located in the non-light-transmitting area on a side of the second substrate facing the liquid crystal layer.

8. The light field display device according to any one of claims 2 to 4, characterized in that: The light field display device further includes: a light control structure located between the display panel and the off-axis transflective structure.

9. The light field display device according to claim 8, characterized in that: The light control structure is used to collimate and transmit the light emitted by the display panel to the off-axis semi-transmissive and semi-reflective structure.

10. The light field display device according to claim 9, characterized in that: The light control structure includes a plurality of micro lenses arranged in an array.

11. The light field display device according to claim 10, characterized in that: The display panel includes pixel groups corresponding to the microlenses one by one; The pixel group includes n pixels, where n is an integer greater than or equal to 2; The orthographic projection of the microlens on the display panel covers at least a portion of the pixel group corresponding thereto; The light emitted by the pixel group passes through the microlens and reaches the off-axis semi-transmissive and semi-reflective structure and converges to the pupil of a single eye.

12. The light field display device according to claim 11, characterized in that: Each of the pixels includes multiple sub-pixel units, different sub-pixel units have different light emission colors, and each sub-pixel unit includes multiple sub-pixels with the same light emission color; The display panel has a first light emitting plane, and different types of sub-pixel units have different light emitting colors on the first light emitting plane; The first light exiting plane coincides with the focal planes of the plurality of micro lenses.

13. A driving method of a light field display device according to any one of claims 1 to 12, characterized in that: The method comprises: In the first display mode, the transmittance of the display structure is controlled to be 0, so that the light emitted by the display panel reaches the off-axis semi-transmissive and semi-reflective structure and converges to the human eye; In the second display mode, the transmittance of the display structure is controlled to be greater than 0, so that the ambient light passes through the display structure to reach the off-axis semi-transmissive and semi-reflective structure and converges to the human eye, and the light emitted by the display panel reaches the off-axis semi-transmissive and semi-reflective structure and converges to the human eye; and / or, In the third display mode, the display structure is controlled to display a picture.

14. The method according to claim 13, characterized in that The display structure includes a brightness collection structure. In the second display mode, controlling the transmittance of the display structure to be greater than 0 specifically includes: The transmittance of the display structure is adjusted according to the brightness of the ambient light collected by the brightness collection structure.

15. A wearable device, characterized in that: It comprises the light field display device according to any one of claims 1 to 12.

Images