TWI885630B - Display apparatus - Google Patents

Abstract

A display apparatus including a transparent display screen and an electrically controlled grating layer is provided. The transparent display screen includes a plurality of display pixel areas. A user is suitable for viewing a scene on a side of the transparent display screen facing away from the user through the transparent display screen. The electrically controlled grating layer is disposed between the transparent display screen and the user. When at least part of the electrically controlled grating layer operates in a grating state and has a plurality of light-transmitting areas spaced apart along a first direction, a part of a right eye field-of-view of the user passing through each light-transmitting area of the electrically controlled grating layer overlap a first display pixel area of the display pixel areas, and a part of a left eye field-of-view of the user passing through each light-transmitting area of the electrically controlled grating layer overlap a second display pixel area of the display pixel areas. 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

Display device

The present invention relates to a display device, and in particular to a display device having both stereoscopic display and perspective functions.

The display applications of augmented reality (AR) and mixed reality (MR) have driven the development of transparent displays. In order to take into account both the see-through and display effects, transparent displays are generally provided with a display pixel area and a see-through area. Since the design of the see-through area will squeeze 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 see-through area makes it impossible to adjust the penetration rate of transparent displays according to the actual usage scenario. On the other hand, since the current transparent displays do not have the function of displaying three-dimensional images, the two-dimensional images presented by the screen and the three-dimensional scenery behind the transparent display are easy to make users feel inconsistent visually.

The present disclosure provides a display device that has both a three-dimensional image display function and an electrically controllable perspective effect.

The display device disclosed herein includes a transparent display screen and an electrically controlled grating layer. The transparent display screen is provided with a display surface facing the user and includes a plurality of display pixel areas. The user is suitable for viewing the scene located on the side of the transparent display screen facing away from 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 portion of the electrically controlled grating layer is suitable for operating in a grating state and has a plurality of light-transmitting areas arranged at intervals along a first direction. When at least a portion of the electrically controlled grating layer is operated in a grating state, the user's left eye field of vision overlaps partially with the first display pixel area of the plurality of display pixel areas through each light-transmitting area of the electrically controlled grating layer. The user's right eye visual field is partially overlapped with the second display pixel area of these display pixel areas through each light-transmitting area of the electrically controlled grating layer. Multiple first display pixel areas of these display pixel areas are suitable for displaying left eye images. Multiple second display pixel areas of these display pixel areas are suitable for displaying right eye images. The left eye image and the right eye image have parallax.

Based on the above, in the display device of the embodiment of the present disclosure, the use of a transparent display screen allows 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 allows the display device to have a three-dimensional image display function at the same time. By adjusting the working cycle of the electrically controlled grating layer, the display device can also present a perspective effect with a variety of transmittances.

10, 10A, 10B, 10C, 10D: Display device

100, 100A: Transparent display

100ds: Display surface

150: Projection element

200, 200A: electrically controlled grating layer

200p1: Part 1

200p2: Part 2

250:Electrically controlled shading layer

300: Camera module

350: Control unit

CAM1, CAM2: imaging components

D1: First direction

D2: Second direction

DA1: First display area

DA2: Second display area

DPA1, DPA2, DPA1”, DPA2”: Display pixel area

Frame(1)~Frame(N): Screen

IFIM: Information Image

LEYE:Left eye

LFOV: Left eye field of view

OBJ1, OBJ2: Object

pLFOV: Partial left eye field of view

pRFOV: Partial right eye field of view

REYE:Right eye

RFOV: right eye field of view

SPX: Display subpixels

STA1, STA2, STA1”, STA2”: perspective area

TA, TA”: light-transmitting area

USR: User

VOBJ: Virtual Object

WD: Transparent Window

FIG. 1A and FIG. 1B are top-view schematic diagrams of a display device according to an embodiment of the present disclosure operating in different display modes.

FIG. 2 is a stereoscopic schematic diagram of the display device of FIG. 1A when operating in a stereoscopic display mode.

FIG. 3A and FIG. 3B are schematic diagrams of two driving modes when the display device of FIG. 1A is operated in a stereoscopic display mode.

Figures 4 and 5 are schematic diagrams of a display device according to an embodiment of the present disclosure performing stereoscopic image display in a local area.

FIG6A is a top view schematic diagram of a display device according to an embodiment of the present disclosure operating in a stereoscopic display mode in a non-perspective state.

FIG6B is a top view schematic diagram of a display device according to an embodiment of the present disclosure operating in a stereoscopic display mode in a local area perspective state.

FIG7 is a schematic diagram of a display device according to an embodiment of the present disclosure performing stereoscopic image display in a local area.

FIG8 is a block diagram of the display device of FIG7.

FIG9 is a top view schematic diagram of a display device according to an embodiment of the present disclosure operating in a stereoscopic display mode.

In the accompanying drawings, the thickness of layers, films, panels, regions, etc., is exaggerated for clarity. 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 another element, or an intermediate element may also exist. Conversely, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intermediate elements. As used herein, "connected" may refer to physical and/or electrical connections. Furthermore, "electrical connection" may be the presence of other elements between two elements.

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 element symbols are used in the drawings and description to represent the same or similar parts.

FIG. 1A and FIG. 1B are schematic top views of a display device according to an embodiment of the present disclosure when operating in different display modes. FIG. 2 is a stereoscopic schematic view of the display device of FIG. 1A when operating in a stereoscopic display mode. FIG. 3A and FIG. 3B are schematic views of two driving modes of the display device of FIG. 1A when operating in a stereoscopic display mode.

Referring to FIG. 1A, FIG. 1B and FIG. 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 a screen body (not shown) of a laptop computer. That is, the display device 10 can be used as a display screen of a laptop 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.

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

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

In order to make the transparent display screen 100 transparent, the transparent display screen 100 may also include multiple transparent areas arranged alternately with the multiple display pixel areas along the first direction D1. That is, a transparent area may be provided between any two adjacent display pixel areas, but is not limited thereto. In other embodiments, two partially adjacent display pixel areas may not be provided with a transparent area, for example, only one transparent area is provided for every two or three adjacent display pixel areas. The arrangement of the multiple display pixel areas and the multiple transparent areas can be adjusted according to actual application requirements.

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

From another point of view, in this embodiment, a display pixel area and a perspective area arranged adjacent to each other along the first direction D1 may constitute 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 area in each pixel unit in the pixel unit may be increased and the area ratio of the display pixel area in the pixel unit may be reduced. Since the size of the pixel unit remains unchanged, increasing the transmittance of the transparent display screen 100 in the above manner does 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 multiple perspective areas on the display surface 100ds to the sum of the orthographic projection areas of multiple perspective areas and multiple display pixel areas on the display surface 100ds may be greater than or equal to 50%.

First, it is explained that the arrangement of the electrically controlled grating layer 200 enables the display device 10 to have a three-dimensional image display function. Specifically, the electrically controlled grating layer 200 is arranged 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 electrically controlled grating layer 200 is located on one side of the display surface 100ds of the transparent display screen 100.

The electrically controlled grating layer 200 is suitable for operating in a grating state or a non-grating state, and can switch between the two states by electrically controlling. For example, the electrically controlled grating layer 200 can be a liquid crystal box (not shown) provided with a patterned electrode, wherein the patterned electrode can be provided corresponding to the light-transmitting area (such as the light-transmitting area TA in FIG. 1A ) or the non-light-transmitting area (i.e., the area outside the light-transmitting area) of the electrically controlled grating layer 200 in the grating state, but is not limited thereto.

Furthermore, when the electrically controlled grating layer 200 is operated 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 arranged at intervals along the first direction D1, for example. At this time, a portion of the left eye field of view LFOV of the left eye LEYE of the user USR and a portion of the right eye field of view RFOV of the right eye REYE will be blocked by the electrically controlled grating layer 200 operated in the grating state (as shown in FIG. 1A ), and only a portion of the left eye field of view pLFOV and a portion of the right eye field of view pRFOV can pass through the plurality of light-transmitting areas TA of the electrically controlled grating layer 200.

It is particularly noted that when the electrically controlled grating layer 200 operates in the grating state, part of the left eye field of view pLFOV through each light-transmitting area TA overlaps the adjacent first display pixel area DPA1 and the first perspective area STA1, and part of the right eye field of view pRFOV through each light-transmitting area TA overlaps the adjacent second display pixel area DPA2 and the second perspective area STA2. Under the shielding of the electrically controlled grating layer 200, the left eye field of view LFOV will not overlap the second display pixel area DPA2 and the second perspective area STA2, and the right eye field of view RFOV will not overlap the first display pixel area DPA1 and the first perspective area STA1.

That is to say, at this time, the left eye LEYE of the user USR 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 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.

Therefore, the first display pixel areas DPA1 of the transparent display screen 100 are suitable for displaying left-eye images, while the second display pixel areas DPA2 are suitable for displaying right-eye images. If the left-eye image and the right-eye image have parallax, the user USR can have a three-dimensional image visual sense.

For example, in FIG. 1A , the left-eye image presented by the plurality of first display pixel areas DPA1 and the right-eye image presented by the plurality of second display pixel areas DPA2 are images of a cup at different viewing angles (i.e., the left-eye image and the right-eye image have parallax). Therefore, when the user USR's eyes see these two images with parallax, he will see a virtual object VOBJ (e.g., a cup) other than the object OBJ2 (e.g., a book) on the object OBJ1 (e.g., a table) behind the transparent display screen 100.

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 incompatibility between the image generated by the display device 10 and the real scene behind it can be greatly reduced. In other words, the display device 10 with both perspective and stereoscopic image display functions can bring the user USR a better immersive visual experience.

It should be noted that in this embodiment, the number of the first display pixel area DPA1 falling within the partial left eye field of view range pLFOV along the first direction D1 and the number of the second display pixel area DPA2 falling within the partial right eye field of view range pRFOV are exemplarily described with one example, and this does not mean that the present disclosure is limited thereto. In other embodiments, the number of the first display pixel area DPA1 covered by the partial left eye field of view range pLFOV and the number of the second display pixel area DPA2 covered by the partial right eye field of view range pRFOV may also be multiple.

Furthermore, when the electrically controlled grating layer 200 operates in a non-grating state (i.e., the active area of the electrically controlled grating layer 200 is all transparent), the left eye field of view LFOV and the right eye field of view RFOV of the user USR will overlap with the first display pixel areas DPA1 and the second display pixel areas DPA2. At this time, all display pixel areas of the transparent display screen 100 are used to display the same image, that is, the display device 10 performs a two-dimensional image display operation in a transparent state.

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

In order to improve the transmittance (i.e., the degree of transparency) of the display device 10 when displaying a three-dimensional image, the grating state of the electrically controlled grating layer 200 can be changed to an intermittent operation. Please refer to FIG. 1A and FIG. 3B. For example, the transparent display screen 100 still operates at a frame rate of N per second, but the difference is that half of the updated frames (e.g., frame (2), frame (4), frame (N-2), and frame (N)) are black frames (i.e., not displayed), while the other half of the updated frames (e.g., frame (1), frame (3), frame (N-3), and frame (N-1)) are maintained the same as the updated frames of FIG. 3A.

It is particularly noted that at this time, the switching frequency of the electrically controlled grating layer 200 between the grating state (as shown in FIG. 1A ) and the non-grating state (as shown in FIG. 1B ) is N/2 times per second. When the transparent display screen 100 displays the picture Frame (1), the picture Frame (3), the picture Frame (N-3) and the picture Frame (N-1), the electrically controlled grating layer 200 is operated in the grating state. When the transparent display screen 100 displays the picture Frame (2), the picture Frame (4), the picture Frame (N-2) and the picture Frame (N) and other black pictures, the electrically controlled grating layer 200 is operated in the non-grating state (for example, the electrically 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 manner of FIG. 3A.

In other words, by adjusting the duty cycle of the electrically controlled grating layer 200, the display device 10 can also present a perspective effect with a variety of transmittances. For example, the driving method of FIG. 3B can further improve the perspective of the display device 10 in the stereoscopic image display state. Accordingly, the operational flexibility of the display device 10 in different usage scenarios can be increased.

The following will list some other embodiments to illustrate the present disclosure in detail, wherein the same components will be marked with the same symbols, and the description of the same technical content will be omitted. For the omitted parts, please refer to the aforementioned embodiments, and no further description will be given below.

FIG. 4 and FIG. 5 are schematic diagrams of a display device according to an embodiment of the present disclosure performing stereoscopic image display in a local area. Referring to FIG. 4 , unlike the display device 10 of FIG. 1A , the display device 10A of the present embodiment can display a stereoscopic image in a local area of the display surface 100ds, and display a two-dimensional image in the remaining area. For example, in the present embodiment, the display surface 100ds of the transparent display screen 100 is suitable for dividing 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).

In order to achieve the effect of displaying a three-dimensional image in a local area, the first part 200p1 of the electrically controlled grating layer 200A overlapping the first display area DA1 can be operated in a non-grating state, and the second part 200p2 of the electrically controlled grating layer 200A overlapping the second display area DA2 can be operated in a grating state. For example, in FIG. 4 , the electrically controlled grating layer 200A operated in a 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 three-dimensional image of the virtual object VOBJ displayed at a specific depth behind the transparent display screen 100 through the display device 10A in a horizontal direction parallel to the first direction D1.

However, the present disclosure is not limited thereto. In another embodiment of the present embodiment, the electrically controlled grating layer 200A operating in the grating state has a plurality of light-transmitting areas TA" arranged at intervals along the first direction D1 and also arranged at intervals along the second direction D2, and the second direction D2 intersects with (e.g., is perpendicular to) the first direction D1. Therefore, the user USR or the bystander (not shown) can also see the three-dimensional image of the virtual object VOBJ at a specific depth behind the transparent display screen 100 through the display device 10A in the vertical direction parallel to the second direction D2. That is, through the design of the grating state in FIG. 5, the display device 10A can have a three-dimensional image display function with a full viewing angle.

It should be noted that in this embodiment, although the number of the first display area DA1 for displaying a three-dimensional image is illustrated as one, in other embodiments, the number of the first display area DA1 may be multiple according to different application scenarios and requirements, and the setting position is not limited to that shown in FIG. 4.

Since the display device 10A of this embodiment is similar to the display device 10 of FIG. 1A , the detailed description of the detailed components can be found in the relevant paragraphs of the aforementioned embodiment, and will not be repeated here.

FIG6A is a schematic diagram of a display device according to an embodiment of the present disclosure operating in a stereoscopic display mode in a non-perspective state. FIG6B is a schematic diagram of a display device according to an embodiment of the present disclosure operating in a stereoscopic display mode in a partial area perspective state.

Please refer to FIG. 6A and FIG. 6B . The difference between the display device 10B of this embodiment and the display device 10 of FIG. 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 suitable for operating in a light shielding state so that the user USR cannot view the scene on the side of the transparent display screen 100 facing away from the user USR through the transparent display screen 100 (as shown in FIG. 6A ), or operating in a light transmitting state so that the user USR can see through the scene behind the transparent display screen 100.

It is particularly noted that even if the user USR is blocked by the electrically controlled light shielding layer 250 in the light shielding state and cannot see the scene behind the transparent display screen 100, the user USR can still see the three-dimensional image (such as the virtual object VOBJ) generated by the display device 10B at a specific depth relative to the position of the user USR, even if the imaging position of the three-dimensional image is on the side of the electrically controlled light shielding layer 250 facing away from the user USR.

As shown in FIG. 6B , in this embodiment, the light-shielding state and the light-transmitting state of the electrically controlled light-shielding layer 250 can be operated in different areas. For example, the electrically controlled light-shielding layer 250 can have a see-through window WD, and the see-through window WD can be defined by other parts that operate in the light-shielding state. In other words, a part of the electrically controlled light-shielding layer 250 is suitable for operating in the light-shielding state and defining the see-through window WD, so that the user USR can view part of the scene behind the display device 10B (i.e., the side of the transparent display screen 100 facing away from the user USR) through the see-through window WD. That is, the setting of the electrically controlled light-shielding layer 250 can enable the display device 10B to have a local area see-through effect.

It should be noted that in this embodiment, although the number of see-through windows WD is illustrated as one, in other embodiments, the number of see-through windows WD may be multiple according to different application requirements.

FIG7 is a schematic diagram of a display device according to an embodiment of the present disclosure performing stereoscopic image display in a local area. FIG8 is a block diagram of the display device of FIG7. Referring to FIG7 and FIG8, the difference between the display device 10C of the present embodiment and the display device 10A of FIG5 is that the display device 10C of the present embodiment further includes a camera module 300 and a control unit 350.

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 electrically couples the camera module 300, the transparent display screen 100, and the electrically controlled 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 can 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.

Furthermore, when at least a portion (e.g., the second portion 200p2) of the electrically controlled grating layer 200A is operated in the grating state, the control unit 350 is adapted 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.

Since the display device 10C of this embodiment is similar to the display device 10A of FIG. 5 and can have a full-viewing angle stereoscopic image display function, the camera module 300 tracks the position of the eyes of the user USR in real time and the control unit 350 adjusts the left eye image and the right eye image accordingly, which can greatly improve the display effect of the display device 10C for stereoscopic images. For example, the parallax of the virtual object VOBJ for the eyes of the user USR will change with different viewing angles, which helps to further improve the user USR's visual experience of stereoscopic images.

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.

FIG9 is a schematic top view of a display device according to an embodiment of the present disclosure when operating in a stereoscopic display mode. Referring to FIG9 , the difference between the display device 10D of the present embodiment and the display device 10 of FIG1A is only that the display mechanism of the display surface is different. For example, in the present embodiment, the display device 10D may also include a projection element 150, which is suitable for projecting a display image onto a display surface 100ds of the transparent display screen 100A. That is, the display screen 100A of the present embodiment may be a projection screen of the projection element 150, but is not limited thereto.

Different from the transparent display screen 100 of FIG. 1A , in this embodiment, the multiple display pixel areas of the transparent display screen 100A are also multiple perspective areas. For example, the first display pixel area DPA1" is also the first perspective area STA1", and the second display pixel area DPA2" is also the second perspective area STA2", but the present invention is not limited thereto.

Since the configuration of other parts of the display device 10A is similar to that of the display device 10 in FIG. 1A and FIG. 2 , please refer to the relevant paragraphs of the aforementioned embodiment for detailed description, and will not be repeated here.

In summary, in a display device of an embodiment of the present disclosure, the use of a transparent display screen allows 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 allows the display device to simultaneously have a three-dimensional image display function. By adjusting the working cycle of the electrically controlled grating layer, the display device can also present a perspective effect with a variety of transmittances.

10: Display device

100: Transparent display

100ds: Display surface

200:Electrically controlled grating layer

LEYE:Left eye

D1: First direction

DPA1, DPA2: Display pixel area

OBJ1, OBJ2: Object

pLFOV: Partial left eye field of view

pRFOV: Partial right eye field of view

REYE:Right eye

SPX: Display subpixels

STA1, STA2: perspective area

TA: light-transmitting area

USR: User

VOBJ: Virtual Object

Claims (11)

A display device comprises: a transparent display screen having a display surface facing a user and including a plurality of display pixel areas, wherein the user is suitable for viewing the scene located on the side of the transparent display screen facing away from 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, wherein at least a portion of the electrically controlled grating layer is suitable for operating in a grating state and having a plurality of light-transmitting areas arranged at intervals along a first direction, When at least a portion of the electrically controlled grating layer is operated in the grating state, a left eye field of the user overlaps a first display pixel area of the display pixel areas through a portion of each of the light-transmitting areas of the electrically controlled grating layer, and a right eye field of the user overlaps a second display pixel area of the display pixel areas through a portion of each of the light-transmitting areas of the electrically controlled grating layer, A plurality of the first display pixel areas of the display pixel areas are suitable for displaying a left eye image, a plurality of the second display pixel areas of the display pixel areas are suitable for displaying a right eye image, and the left eye image and the right eye image have parallax. A display device as described in claim 1, wherein the transparent display screen further includes a plurality of perspective areas, the display pixel areas and the perspective areas are alternately arranged along the first direction, and when the at least a portion of the electrically-controlled grating layer is operated in the grating state, the portion of the user's left eye field of view passing through each of the transparent areas of the electrically-controlled grating layer also overlaps with a first perspective area of the perspective areas, and the portion of the user's right eye field of view passing through each of the transparent areas of the electrically-controlled grating layer also overlaps with a second perspective area of the perspective areas, the first perspective area is adjacent to the first display pixel area, and the second perspective area is adjacent to the second display pixel area. A display device as described in claim 2, wherein the percentage of the orthographic projection areas of the perspective areas on the display surface to the sum of the orthographic projection areas of the perspective areas and the display pixel areas on the display surface is greater than or equal to 50%. A display device as described in claim 1, wherein at least a portion of the electrically controlled grating layer is further adapted to operate in a grating-free state, so that the left eye viewing range and the right eye viewing range of the user overlap with the first display pixel area and the second display pixel area, respectively. A display device as described in claim 4, wherein when the transparent display screen operates at a frame rate of N per second, the switching frequency of the electrically controlled grating layer between the grating state and the non-grating state is N/2 times per second. A display device as described in claim 4, wherein the display surface of the transparent display screen is suitable for dividing into a first display area for displaying a two-dimensional image and a second display area for displaying a three-dimensional image, a first portion of the electrically-controlled grating layer overlapping the first display area operates in the grating-free state, and a second portion of the electrically-controlled grating layer overlapping the second display area operates in the grating state. The display device as described in claim 1, wherein the light-transmitting areas of the electrically-controlled grating layer are further arranged at intervals along a second direction, and the second direction is perpendicular to the first direction. The display device as described in claim 1 further comprises: a camera module for capturing the head image of the user; and a control unit electrically coupled to the camera module, wherein when the at least a portion of the electrically controlled grating layer operates in the grating state, the control unit is adapted to obtain the eye position of the user according to the head image from the camera module, and adjust the left eye image and the right eye image in real time according to the eye position. The display device as described in claim 1 further comprises: An electrically controlled light-shielding layer, disposed on the side of the transparent display screen facing away from the electrically controlled grating layer and overlapping the display surface of the transparent display screen, at least a portion of the electrically controlled light-shielding layer being adapted to operate in a light-shielding state, so that the user cannot view at least a portion of the scene located on the side of the transparent display screen facing away from the user through the portion of the transparent display screen overlapping with the at least a portion of the electrically controlled light-shielding layer. A display device as described in claim 1, wherein each of the display pixel areas of the transparent display screen is provided with a plurality of display sub-pixels having different display colors. The display device as described in claim 1 further comprises: A projection element adapted to project the left-eye image and the right-eye image onto the display surface of the transparent display screen.