Display device

Abstract

A display device comprises a transparent display screen and an electric control grating layer. The transparent display screen comprises a plurality of display pixel areas. A user is suitable for viewing scenery on the side, back to the user, of the transparent display screen through the transparent display screen. And the electric control grating layer is arranged between the transparent display screen and a user. When at least one part of the electric control grating layer is operated in a grating state and has a plurality of light-transmitting areas which are arranged at intervals along a first direction, a left eye view range of a user is overlapped with a first display pixel area of the plurality of display pixel areas through parts of the light-transmitting areas of the electric control grating layer; and the right eye view range of the electronic control grating layer is partially overlapped on the second display pixel area of the display pixel areas through each light-transmitting area of the electronic control grating layer. The first display pixel area and the second display pixel area respectively display a left eye image and a right eye image with parallax.

Description

Technical Field

[0001] The present invention relates to a display device, and particularly to a display device with both stereoscopic display and perspective functions. Background Art

[0002] The display applications of Augmented Reality (AR) and Mixed Reality (MR) have driven the development of transparent displays. In order to balance the perspective and display effects, transparent displays generally have a display pixel area and a perspective area. Due to the design of the perspective area squeezing the layout space of the display pixel area, the display resolution of transparent displays is often lower than that of general displays. In addition, the fixed structure of the perspective area makes the transmittance of transparent displays unable to be adjusted according to the actual usage scenario. On the other hand, since current transparent displays do not have the function of displaying stereoscopic images, the two-dimensional images presented on the screen and the three-dimensional scenes behind the transparent display are likely to cause a sense of incongruity to the user visually. Summary of the Invention

[0003] The present disclosure provides a display device that simultaneously has the function of displaying stereoscopic images and an electrically controllable perspective effect.

[0004] The display device of the present disclosure includes a transparent display screen and an electrically controlled grating layer. The transparent display screen has a display surface facing the user and includes a plurality of display pixel areas. The user is adapted to view the scene located on the side of the transparent display screen opposite to the user through the transparent display screen. The electrically controlled grating layer is disposed between the transparent display screen and the user and overlaps the display surface. At least a part of the electrically controlled grating layer is used to operate in a grating state and has a plurality of light-transmitting areas arranged at intervals along a first direction. When at least a part of the electrically controlled grating layer operates in the grating state, the left-eye visual field range of the user partially overlaps the first display pixel areas of the plurality of display pixel areas through each light-transmitting area of the electrically controlled grating layer. The right-eye visual field range of the user partially overlaps the second display pixel areas of these display pixel areas through each light-transmitting area of the electrically controlled grating layer. The plurality of first display pixel areas of these display pixel areas are used to display left-eye images. The plurality of second display pixel areas of these display pixel areas are used to display right-eye images. The left-eye image and the right-eye image have a parallax.

[0005] Based on the above, in the display device of the embodiment of the present disclosure, the selection of the transparent display screen can enable the user to have a sense of perspective on the scene behind the display screen when operating the display device. In addition, the electrically controlled grating layer disposed between the user and the transparent display screen can enable the display device to simultaneously have the function of displaying stereoscopic images. By adjusting the working cycle of the electrically controlled grating layer, the display device can also present the perspective effect with various transmittances. Brief Description of the Drawings

[0006] Figure 1A and Figure 1B is a top view schematic diagram when the display device according to an embodiment of the present disclosure operates in different display modes.

[0007] Figure 2 is Figure 1A a stereoscopic schematic diagram when the display device operates in a stereoscopic display mode.

[0008] Figure 3A and Figure 3B is Figure 1A a schematic diagram of two driving methods when the display device operates in a stereoscopic display mode.

[0009] Figure 4 and Figure 5 are respectively schematic diagrams of the display device according to an embodiment of the present disclosure for stereoscopic image display in a local area.

[0010] Figure 6A is a top view schematic diagram when the display device according to an embodiment of the present disclosure operates in a stereoscopic display mode without a perspective state.

[0011] Figure 6B is a top view schematic diagram when the display device according to an embodiment of the present disclosure operates in a stereoscopic display mode in a perspective state of a local area.

[0012] Figure 7 is a schematic diagram of the display device according to an embodiment of the present disclosure for stereoscopic image display in a local area.

[0013] Figure 8 is Figure 7 a block diagram of the display device.

[0014] Figure 9 is a top view schematic diagram when the display device according to an embodiment of the present disclosure operates in a stereoscopic display mode.

[0015] Wherein,

[0016] 10, 10A, 10B, 10C, 10D: Display device;

[0017] 100, 100A: Transparent display screen;

[0018] 100ds: Display surface;

[0019] 150: Projection element;

[0020] 200, 200A: Electrically controlled grating layer;

[0021] 200p1: First part;

[0022] 200p2: Second part;

[0023] 250: Electrically controlled light-shielding layer;

[0024] 300: Camera module;

[0025] 350: Control unit;

[0026] CAM1, CAM2: Image sensor elements;

[0027] D1: First direction;

[0028] D2: Second direction;

[0029] DA1: First display area;

[0030] DA2: Second display area;

[0031] DPA1, DPA2, DPA1”, DPA2”: Display pixel areas;

[0032] Frame(1)~Frame(N): Images;

[0033] IFIM: Information image;

[0034] LEYE: Left eye;

[0035] LFOV: Left-eye field of view;

[0036] OBJ1, OBJ2: Objects;

[0037] pLFOV: Partial left-eye field of view;

[0038] pRFOV: Partial right-eye field of view;

[0039] REYE: Right eye;

[0040] RFOV: Right-eye field of view;

[0041] SPX: Display sub-pixel;

[0042] STA1, STA2, STA1”, STA2”: Perspective areas;

[0043] TA, TA”: Translucent areas;

[0044] USR: User;

[0045] VOBJ: Virtual object;

[0046] WD: Perspective window. Detailed implementation manners

[0047] In the drawings, for clarity, the thickness of layers, films, panels, regions, etc. is exaggerated. It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, no intervening element is present. As used herein, "connected" may refer to physical and / or electrical connection. Furthermore, "electrically connected" may mean that other elements exist between two elements.

[0048] Reference will now be made in detail to exemplary embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used in the drawings and the description to refer to the same or like parts.

[0049] Figure 1A and Figure 1B is a top view schematic diagram when a display device according to an embodiment of the present disclosure operates in different display modes. Figure 2 is Figure 1A a perspective view schematic diagram when the display device operates in a stereoscopic display mode. Figure 3A and Figure 3B is Figure 1A a schematic diagram of two driving methods when the display device operates in a stereoscopic display mode.

[0050] Please refer to Figure 1A , Figure 1B and Figure 2 , the display device 10 includes a transparent display screen 100 and an electrically controlled grating layer 200. The transparent display screen 100 is provided with a display surface 100ds facing the user USR. In this embodiment, the transparent display screen 100 and the electrically controlled grating layer 200 can be disposed in the screen body (not shown) of a notebook computer. That is, the display device 10 can be used as the display screen of a notebook computer, but is not limited thereto. In other applications, the display device 10 can also be a desktop screen, such as a professional drawing screen or an e-sports screen.

[0051] A plurality of display pixel regions are provided on the display surface 100ds of the transparent display screen 100. In this embodiment, these display pixel regions include, for example, a plurality of first display pixel regions DPA1 and a plurality of second display pixel regions DPA2, and the first display pixel regions DPA1 and the second display pixel regions DPA2 can be alternately arranged along a first direction D1.

[0052] In this embodiment, each display pixel region of the transparent display screen 100 may be provided with a plurality of display sub-pixels SPX having different display colors. More specifically, the transparent display screen 100 of this embodiment may be a transparent display panel, such as a non-self-luminous display panel (such as a liquid crystal display panel) or a self-luminous display panel (such as a micro light-emitting diode display panel, an organic light-emitting diode display panel, or a sub-millimeter light-emitting diode display panel), but is not limited thereto.

[0053] In order to make the transparent display screen 100 have transparency, the transparent display screen 100 may further include a plurality of perspective regions arranged alternately with the plurality of display pixel regions along the first direction D1. That is, a perspective region may be provided between any two adjacent display pixel regions, but is not limited thereto. In other embodiments, a perspective region may not be provided between some adjacent two display pixel regions. For example, a perspective region is provided for every two or three adjacent display pixel regions. The arrangement of the plurality of display pixel regions and the plurality of perspective regions can be adjusted according to actual application requirements.

[0054] In this embodiment, the plurality of perspective regions of the transparent display screen 100 may include a plurality of first perspective regions STA1 and a plurality of second perspective regions STA2. The user USR can view the real scene located behind the transparent display screen 100 (i.e., the side facing away from the user USR) through these perspective regions. The real scene includes, for example, an object OBJ1 and an object OBJ2. In this embodiment, the object OBJ1 and the object OBJ2 are, for example, a table and a book, respectively, but are not limited thereto.

[0055] From another perspective, in this embodiment, an adjacent display pixel region and a perspective region arranged along the first direction D1 may form a pixel unit of the transparent display screen 100. In order to improve the transmittance of the transparent display screen 100, the area ratio of the perspective region in each pixel unit to the area of the pixel unit can be increased and the area ratio of the display pixel region in the pixel unit can be decreased. Since the size of the pixel unit remains unchanged, increasing the transmittance of the transparent display screen 100 in the above manner will not reduce the display resolution of the transparent display screen 100. For example, in this embodiment, the percentage value of the orthographic projection area of the plurality of perspective regions on the display surface 100ds to the total orthographic projection area of the plurality of perspective regions and the plurality of display pixel regions on the display surface 100ds may be greater than or equal to 50%.

[0056] It should be noted first that the setting of the electro-controlled grating layer 200 enables the display device 10 to have the function of displaying a stereoscopic image. Specifically, the electro-controlled grating layer 200 is disposed between the transparent display screen 100 and the user USR and overlaps the display surface 100ds of the transparent display screen 100. That is, the electro-controlled grating layer 200 is located on one side of the display surface 100ds of the transparent display screen 100.

[0057] The electrically controlled grating layer 200 is used to operate in a grating state or a non-grating state, and the switching between these two states can be carried out in an electrically controlled manner. For example, the electrically controlled grating layer 200 can be a liquid crystal cell (not shown) provided with patterned electrodes, where the patterned electrodes can be arranged corresponding to the light-transmitting areas (such as Figure 1A the light-transmitting area TA) or non-light-transmitting areas (i.e., the areas other than the light-transmitting areas) of the electrically controlled grating layer 200 in the grating state, but not limited thereto.

[0058] Furthermore, when the electrically controlled grating layer 200 operates in the grating state, the electrically controlled grating layer 200 forms a plurality of light-transmitting areas TA, and these light-transmitting areas TA are, for example, arranged at intervals along the first direction D1. At this time, a part of the left-eye visual field range LFOV of the user USR's left eye LEYE and a part of the right-eye visual field range RFOV of the right eye REYE will be blocked by the electrically controlled grating layer 200 operating in the grating state (as Figure 1A shown), and only a part of the left-eye visual field range pLFOV and a part of the right-eye visual field range pRFOV can pass through the plurality of light-transmitting areas TA of the electrically controlled grating layer 200.

[0059] It should be particularly noted that when the electrically controlled grating layer 200 operates in the grating state, a part of the left-eye visual field range pLFOV passing through each light-transmitting area TA overlaps with the adjacent first display pixel area DPA1 and the first perspective area STA1, and a part of the right-eye visual field range pRFOV passing through each light-transmitting area TA overlaps with the adjacent second display pixel area DPA2 and the second perspective area STA2. Under the occlusion of the electrically controlled grating layer 200, the left-eye visual field range LFOV does not overlap with the second display pixel area DPA2 and the second perspective area STA2, and the right-eye visual field range RFOV does not overlap with the first display pixel area DPA1 and the first perspective area STA1.

[0060] That is to say, at this time, the user USR's left eye LEYE can see the first display pixel area DPA1 through the light-transmitting area TA of the electrically controlled grating layer 200, but cannot see the second display pixel area DPA2. The right eye REYE of the user USR can see the second display pixel area DPA2 through the light-transmitting area TA of the electrically controlled grating layer 200, but cannot see the first display pixel area DPA1.

[0061] Therefore, the plurality of first display pixel areas DPA1 of the transparent display screen 100 are used to display the left-eye image, and the plurality of second display pixel areas DPA2 are used to display the right-eye image. If the left-eye image and the right-eye image have a parallax, the user USR can have a visual sense of a stereoscopic image.

[0062] For example, in Figure 1AAmong them, the left-eye image presented by multiple first display pixel regions DPA1 and the right-eye image presented by multiple second display pixel regions DPA2 are images of a cup from different perspectives (i.e., the left-eye image and the right-eye image have parallax). Therefore, when the user USR's both eyes see these two parallax images, a virtual object VOBJ (such as a cup) other than the object OBJ2 (such as a book) will be seen on the object OBJ1 (such as a table) behind the transparent display screen 100.

[0063] The virtual object VOBJ generated by the display device 10 gives the user USR a sense of depth, as if it is set on the object OBJ1 in the real environment. Therefore, the visual incongruity between the image generated by the display device 10 and the real scene behind it can be significantly reduced. In other words, the display device 10 with both perspective and stereoscopic image display functions can bring a better immersive visual experience to the user USR.

[0064] It should be noted that in this embodiment, the number of the first display pixel regions DPA1 falling within the partial left-eye field of view pLFOV along the first direction D1 and the number of the second display pixel regions DPA2 falling within the partial right-eye field of view pRFOV are exemplarily illustrated by taking one as an example, and it does not mean that this disclosure is limited thereto. In other embodiments, the number of the first display pixel regions DPA1 covered by the partial left-eye field of view pLFOV and the number of the second display pixel regions DPA2 covered by the partial right-eye field of view pRFOV can also be multiple.

[0065] Furthermore, when the electro-controlled grating layer 200 operates in the non-grating state (i.e., all the active regions of the electro-controlled grating layer 200 are light-transmitting regions), the left-eye field of view LFOV and the right-eye field of view RFOV of the user USR will each overlap with multiple first display pixel regions DPA1 and multiple second display pixel regions DPA2. At this time, all the display pixel regions of the transparent display screen 100 are used to display the same image, that is, the display device 10 performs the display operation of the two-dimensional image in the see-through state.

[0066] Please refer to Figure 1A and Figure 3A , when the display device 10 performs the display operation of the stereoscopic image, the transparent display screen 100 operates at N frames per second (FPS). That is, the number of updated image frames within 1 second is N, such as image Frame(1), image Frame(2),...., image Frame(N - 1), and image Frame(N). The electro-controlled grating layer 200 continuously operates in the grating state (such as the state in which the electro-controlled grating layer 200 is enabled). At this time, the display device 10 has a first transmittance T1.

[0067] In order to improve the transmittance (i.e., the perspective degree) of the display device 10 during stereoscopic image display, the grating state of the electro-controlled grating layer 200 can be operated in an intermittent manner. Please refer to Figure 1A and Figure 3B , for example, the transparent display screen 100 still operates at a frame rate of N per second. However, the difference is that half of the updated frames (such as frame Frame(2), frame Frame(4), frame Frame(N - 2), and frame Frame(N)) are black frames (i.e., not displayed), while the other half of the updated frames (such as frame Frame(1), frame Frame(3), frame Frame(N - 3), and frame Frame(N - 1)) remain the same as Figure 3A the updated frames.

[0068] It should be noted specifically that at this time, the switching frequency between the grating state (as shown by the electro-controlled grating layer 200 in Figure 1A ) and the non-grating state (as shown by the electro-controlled grating layer 200 in Figure 1B ) of the electro-controlled grating layer 200 is N / 2 times per second. Among them, when the transparent display screen 100 displays frame Frame(1), frame Frame(3), frame Frame(N - 3), and frame Frame(N - 1), the electro-controlled grating layer 200 operates in the grating state. When the transparent display screen 100 displays black frames such as frame Frame(2), frame Frame(4), frame Frame(N - 2), and frame Frame(N), the electro-controlled grating layer 200 operates in the non-grating state (for example, the state where the electro-controlled grating layer 200 is disabled). At this time, the display device 10 has a second transmittance T2, and the second transmittance T2 is twice the first transmittance T1 when the display device 10 is driven in the Figure 3A way.

[0069] That is to say, by adjusting the duty cycle of the electro-controlled grating layer 200, the display device 10 can also present perspective effects with multiple transmittances. For example, Figure 3B the driving method can further improve the perspective of the display device 10 operating in the stereoscopic image display state. Accordingly, the operating flexibility of the display device 10 in different usage scenarios can be increased.

[0070] Some other embodiments will be listed below to illustrate the present disclosure in detail. Among them, the same components will be labeled with the same symbols, and the description of the same technical content will be omitted. For the omitted part, please refer to the foregoing embodiments and will not be repeated hereinafter.

[0071] Figure 4 and Figure 5Schematic diagrams showing a display device performing stereoscopic image display in a local area according to an embodiment of the present disclosure. Please refer to Figure 4 , different from Figure 1A the display device 10, the display device 10A of this embodiment can display a stereoscopic image in a local area of the display surface 100ds and display a two-dimensional image in the remaining areas. For example, in this embodiment, the display surface 100ds of the transparent display screen 100 is adapted to divide into a first display area DA1 for displaying a two-dimensional image (such as an information image IFIM) and a second display area DA2 for displaying a three-dimensional image (such as a stereoscopic image of a virtual object VOBJ).

[0072] To achieve the effect of stereoscopic image display in a local area, the first portion 200p1 of the electrically controlled grating layer 200A overlapping the first display area DA1 can be operated in a non-grating state, while the second portion 200p2 of the electrically controlled grating layer 200A overlapping the second display area DA2 can be operated in a grating state. For example, in Figure 4 , the electrically controlled grating layer 200A operated in the grating state has a plurality of light-transmitting areas TA arranged at intervals along the first direction D1. Therefore, the user USR can see the stereoscopic image of the virtual object VOBJ presented at a specific depth behind the transparent display screen 100 in the horizontal direction parallel to the first direction D1 through the display device 10A.

[0073] However, the present disclosure is not limited thereto. In another implementation aspect of this embodiment, the plurality of light-transmitting areas TA” of the electrically controlled grating layer 200A operated in the grating state are not only arranged at intervals along the first direction D1, but also arranged at intervals along the second direction D2, and the second direction D2 intersects (such as being perpendicular to) the first direction D1. Therefore, the user USR or a bystander (not shown) can also see the stereoscopic image of the virtual object VOBJ presented at a specific depth behind the transparent display screen 100 in the vertical direction parallel to the second direction D2 through the display device 10A. That is, through Figure 5 the design of the grating state in, the display device 10A can be equipped with a full-view stereoscopic image display function.

[0074] It should be noted that in this embodiment, although the number of the first display areas DA1 for displaying stereoscopic images is exemplified by one, in other embodiments, the number of the first display areas DA1 can also be multiple according to different application scenarios and requirements, and the setting positions are not limited to Figure 4 the content shown.

[0075] Since the display device 10A of this embodiment is similar to Figure 1A the display device 10, for the detailed description of the detailed components, reference can be made to the relevant paragraphs of the foregoing embodiments, and thus will not be repeated here.

[0076] Figure 6A It is a top view schematic diagram when the display device according to an embodiment of the present disclosure operates in a stereoscopic display mode in a non-perspective state. Figure 6B It is a top view schematic diagram when the display device according to an embodiment of the present disclosure operates in a stereoscopic display mode in a perspective state of a partial area.

[0077] Please refer to Figure 6A and Figure 6B The difference between the display device 10B of this embodiment and the display device 10 of Figure 1A is that the display device 10B of this embodiment may further include an electrically controlled light-shielding layer 250, which is disposed on the side of the transparent display screen 100 facing away from the electrically controlled grating layer 200 and overlaps the display surface 100ds of the transparent display screen 100. The electrically controlled light-shielding layer 250 is used to operate in a light-shielding state, so that the user USR cannot view the scenery located on the side of the transparent display screen 100 facing away from the user USR through the transparent display screen 100 (as shown in Figure 6A ), or operate in a light-transmitting state, so that the user USR can see through the scenery located behind the transparent display screen 100.

[0078] It should be specifically noted that even if the user USR is blocked by the electrically controlled light-shielding layer 250 operating in the light-shielding state and cannot see the scenery behind the transparent display screen 100, the user USR can still see the stereoscopic image (such as the virtual object VOBJ) generated at a specific depth relative to the position of the user USR by the display device 10B, even if the imaging position of the stereoscopic image is on the side of the electrically controlled light-shielding layer 250 facing the user USR.

[0079] As Figure 6B shown, in this embodiment, the light-shielding state and the light-transmitting state of the electrically controlled light-shielding layer 250 can be operated in a partitioned manner. For example, the electrically controlled light-shielding layer 250 may have a perspective window WD, and the perspective window WD may be defined by other parts operating in the light-shielding state. In other words, a part of the electrically controlled light-shielding layer 250 is used to operate in the light-shielding state and define the perspective window WD, so that the user USR can view part of the scenery located behind the display device 10B (that is, the side of the transparent display screen 100 facing away from the user USR) through the perspective window WD. That is, the setting of the electrically controlled light-shielding layer 250 enables the display device 10B to have a perspective effect in a partial area.

[0080] It should be noted that in this embodiment, although the number of the perspective windows WD is exemplified by one, in other embodiments, according to different application requirements, the number of the perspective windows WD may also be multiple.

[0081] Figure 7 It is a schematic diagram of the display device according to an embodiment of the present disclosure for stereoscopic image display in a partial area.Figure 8 is Figure 7 a block diagram of a display device. Please refer to Figure 7 and Figure 8 , the difference between the display device 10C of this embodiment and the display device 10A of Figure 5 is that the display device 10C of this embodiment further includes a camera module 300 and a control unit 350.

[0082] In this embodiment, the camera module 300 is disposed on the side of the transparent display screen 100 facing the user USR, and is used to capture the head image of the user USR. The control unit 350 is electrically coupled to the camera module 300, the transparent display screen 100, and the electro-control grating layer 200A. In this embodiment, the camera module 300 may include a first camera element CAM1 and a second camera element CAM2, but is not limited thereto. In other embodiments, the number of camera elements included in the camera module 300 may be adjusted according to different application requirements. The camera element is, for example, a Complementary Metal-Oxide-Semiconductor (CMOS) image sensor or a Charge Coupled Device (CCD) image sensor, but is not limited thereto.

[0083] Furthermore, when at least a part (e.g., the second part 200p2) of the electro-control grating layer 200A operates in the grating state, the control unit 350 is used to obtain the positions of the left eye LEYE and the right eye REYE of the user USR (i.e., the eye positions) according to the head image from the camera module 300, and adjust the left-eye image and the right-eye image in real time according to the eye positions.

[0084] Since the display device 10C of this embodiment is similar to the display device 10A of Figure 5 and can have a full-view stereoscopic image display function, by instantaneously tracking the positions of the two eyes of the user USR through the camera module 300 and the control unit 350 correspondingly adjusting the left-eye image and the right-eye image, the display effect of the display device 10C for stereoscopic images can be greatly improved. For example, the parallax of the virtual object VOBJ with respect to the two eyes of the user USR will change with different viewing angles, which helps to further enhance the visual experience of the user USR for stereoscopic images.

[0085] On the other hand, in this embodiment, the camera module 300 can also be used to identify the gesture changes of the user USR, and transmit the signal to the control unit 350 for processing to generate a control signal for the display content or the display device 10C.

[0086] Figure 9It is a top view schematic diagram when the display device according to an embodiment of the present disclosure operates in a stereoscopic display mode. Please refer to Figure 9 , the difference between the display device 10D of this embodiment and the Figure 1A display device 10 is only that the display mechanisms of the display surfaces are different. For example, in this embodiment, the display device 10D may further include a projection element 150 for projecting a display image onto the display surface 100ds of the transparent display screen 100A. That is to say, the display screen 100A of this embodiment may be a projection screen of the projection element 150, but it is not limited thereto.

[0087] Different from the Figure 1A transparent display screen 100, in this embodiment, multiple display pixel regions of the transparent display screen 100A are also multiple perspective regions at the same time. For example, the first display pixel region DPA1” is also the first perspective region STA1” at the same time, and the second display pixel region DPA2” is also the second perspective region STA2” at the same time, but it is not limited thereto.

[0088] Since the settings of other parts of the display device 10A are similar to those of the Figure 1A and Figure 2 display device 10, for detailed description, please refer to the relevant paragraphs of the foregoing embodiments, and will not be repeated here.

[0089] In summary, in the display device according to an embodiment of the present disclosure, the selection of the transparent display screen enables the user to have a sense of perspective on the scenery behind the display screen when operating the display device. In addition, the electro-controlled grating layer provided between the user and the transparent display screen enables the display device to simultaneously have the display function of a stereoscopic image. By adjusting the working cycle of the electro-controlled grating layer, the display device can also present the perspective effect with multiple transmittances.

Claims

1. A display device, comprising: A transparent display screen, having a display surface facing a user, and including a plurality of display pixel regions, the user being adapted to view a scene located on a side of the transparent display screen opposite to the user through the transparent display screen; And An electrically controlled grating layer, disposed between the transparent display screen and the user and overlapping the display surface, at least a part of the electrically controlled grating layer being operable in a grating state to have a plurality of light-transmitting regions arranged at intervals along a first direction, Wherein when at least a part of the electrically controlled grating layer is operable in the grating state, a left-eye visual field range of the user partially overlaps a first display pixel region of the display pixel regions through respective ones of the light-transmitting regions of the electrically controlled grating layer, and a right-eye visual field range of the user partially overlaps a second display pixel region of the display pixel regions through respective ones of the light-transmitting regions of the electrically controlled grating layer, A plurality of the first display pixel regions of the display pixel regions are for displaying a left-eye image, a plurality of the second display pixel regions of the display pixel regions are for displaying a right-eye image, and the left-eye image and the right-eye image have a parallax.

2. The display device according to claim 1, wherein The transparent display screen further includes a plurality of perspective regions, the display pixel regions and the perspective regions being alternately arranged along the first direction. When at least a part of the electrically controlled grating layer is operable in the grating state, the left-eye visual field range of the user further overlaps a first perspective region of the perspective regions through the respective parts of the light-transmitting regions of the electrically controlled grating layer, and the right-eye visual field range of the user further overlaps a second perspective region of the perspective regions through the respective parts of the light-transmitting regions of the electrically controlled grating layer. The first perspective region is adjacent to the first display pixel region in arrangement, and the second perspective region is adjacent to the second display pixel region in arrangement.

3. The display device according to claim 2, characterized in that, A percentage value of a projected area of the perspective regions on the display surface to a total projected area of the perspective regions and the display pixel regions on the display surface is greater than or equal to 50%.

4. The display device according to claim 1, wherein At least a part of the electrically controlled grating layer is further operable in a non-grating state, enabling the left-eye visual field range and the right-eye visual field range of the user to respectively overlap the first display pixel region and the second display pixel region.

5. The display device according to claim 4, wherein When the transparent display screen operates at a frame rate of N per second, a switching frequency of the electrically controlled grating layer between the grating state and the non-grating state is N / 2 times per second.

6. The display device according to claim 4, characterized in that, The display surface of the transparent display screen is used to demarcate a first display area for displaying a two-dimensional image and a second display area for displaying a three-dimensional image. A first part of the electrically controlled grating layer overlapping the first display area operates in the non-grating state, and a second part of the electrically controlled grating layer overlapping the second display area operates in the grating state.

7. The display device according to claim 1, wherein The light-transmitting regions of the electrically controlled grating layer are also arranged at intervals along a second direction perpendicular to the first direction.

8. The display device according to claim 1, wherein, Further comprising: A camera module for capturing an image of the user's head; and A control unit is electrically coupled to the imaging module. When at least a part of the electro-controlled grating layer operates in the grating state, the control unit is configured to obtain the eye position of the user based on the head image from the imaging module, and adjust the left-eye image and the right-eye image in real time according to the eye position.

9. The display device according to claim 1, characterized in that, Further included are: An electro-controlled light-shielding layer is disposed on a side of the transparent display screen facing away from the electro-controlled grating layer and overlaps the display surface of the transparent display screen. At least a part of the electro-controlled light-shielding layer is configured to operate in a light-shielding state, preventing the user from viewing at least a part of the scene located on the side of the transparent display screen facing away from the user through a part of the transparent display screen that overlaps with at least a part of the electro-controlled light-shielding layer.

10. The display device according to claim 1, wherein, Each display pixel region of the transparent display screen is provided with a plurality of display sub-pixels having different display colors.

11. The display device according to claim 1, characterized in that, Further included are: A projection element is configured to project the left-eye image and the right-eye image onto the display surface of the transparent display screen.

Images