Near-to-eye display device and control method thereof

Abstract

The invention provides a near-eye display device and a control method thereof. The near-eye display device comprises a double-sided display panel, a first coupling-in grating, a first optical waveguide, a first coupling-out unit, a second coupling-in grating, a second optical waveguide and a second coupling-out unit. The double-sided display panel is provided with a first light emitting side and a second light emitting side which are oppositely arranged; the first coupling grating is stacked on a first light emitting side of the double-sided display panel; the first optical waveguide is stacked on one side, far away from the double-sided display panel, of the first coupling-in grating; the first coupling-out unit is arranged in the first optical waveguide; the second coupling grating is stacked on the second light emitting side of the double-sided display panel; the second optical waveguide is stacked on one side, far away from the double-sided display panel, of the second coupling-in grating; and the second coupling-out unit is arranged in the second optical waveguide.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a near-eye display device and a control method thereof. Background Art

[0002] The near-eye display device is used to transform small-size images at close range into long-distance enlarged virtual images in front of the user's field of view. It can also superimpose the virtual image on the real physical scene information in real time. It has the characteristics of virtual-reality fusion, three-dimensional immersion, and hands-free real-time interaction, and is widely used in various fields.

[0003] In the related art, some near-eye display devices have poor field of view due to unreasonable structural design when designing structures such as coupling structures and optical waveguide structures for displaying source images. Summary of the invention

[0004] A first aspect of an embodiment of the present disclosure provides a near-eye display device, including:

[0005] A double-sided display panel having a first light-emitting side and a second light-emitting side arranged opposite to each other;

[0006] A first coupling grating, stacked and arranged on the first light-emitting side of the double-sided display panel;

[0007] A first optical waveguide, stacked and arranged on a side of the first coupling grating away from the double-sided display panel;

[0008] A first outcoupling unit, arranged inside the first optical waveguide;

[0009] A second coupling grating, stacked and arranged on the second light-emitting side of the double-sided display panel;

[0010] A second optical waveguide is stacked and arranged on a side of the second coupling-in grating away from the double-sided display panel;

[0011] A second outcoupling unit is arranged inside the second optical waveguide;

[0012] The first light emitted from the first light-emitting side of the double-sided display panel is coupled into the first optical waveguide through the first coupling-in grating, and is coupled out to the first observation point through the first coupling-out unit;

[0013] The second light emitted from the second light emitting side of the double-sided display panel is coupled into the second optical waveguide through the second coupling-in grating, and is coupled out to the second observation point through the second coupling-out unit.

[0014] Optionally, the double-sided display panel includes a first display area and a second display area arranged along a first direction;

[0015] The first coupling grating and the second coupling grating are electrically controlled gratings, the first coupling grating includes a first grating area and a second grating area arranged along a second direction, the first grating area and the second grating area are independently controlled, the second coupling grating includes a third grating area and a fourth grating area arranged along a third direction, the third grating area and the fourth grating area are independently controlled, and the first direction, the second direction and the third direction are parallel to each other;

[0016] The orthographic projections of the first grating area and the third grating area on the double-sided display panel respectively overlap at least partially with the first display area;

[0017] The orthographic projections of the second grating area and the fourth grating area on the double-sided display panel respectively overlap at least partially with the second display area.

[0018] Optionally, the orthographic projections of the first grating area and the third grating area on the double-sided display panel respectively cover the first display area;

[0019] The orthographic projections of the second grating area and the fourth grating area on the double-sided display panel respectively cover the second display area.

[0020] Optionally, the first display area and the second display area have substantially the same area; the first grating area and the second grating area have substantially the same area; and the third grating area and the fourth grating area have substantially the same area.

[0021] Optionally, the double-sided display panel further includes: a third display area, located between the first display area and the second display area;

[0022] The first grating region has a first projection area on the first optical waveguide, the second grating region has a second projection area on the first optical waveguide, and adjacent boundaries of the first projection area and the second projection area overlap and are located in the third display area;

[0023] The third grating area has a third projection area on the first optical waveguide, the fourth grating area has a fourth projection area on the first optical waveguide, and adjacent boundaries of the third projection area and the fourth projection area overlap and are located in the third display area.

[0024] Optionally, along the first direction, a ratio of a width of the third display area to a width of the first display area or the second display area is in a range of 0.1-0.2.

[0025] Optionally, the first coupling-in grating, the second coupling-in grating and the double-sided display panel constitute an inter-waveguide component;

[0026] There is a spacing region between the first optical waveguide and the second optical waveguide, the spacing region includes a first sub-region and a second sub-region, the first sub-region is provided with the inter-waveguide component, and the second sub-region is a gap region;

[0027] At least one side of the inter-waveguide component is flush with at least one side of the first optical waveguide and at least one side of the second optical waveguide.

[0028] Optionally, the second coupling unit is closer to the double-sided display panel than the first coupling unit, and the first coupling unit and the second coupling unit are arranged obliquely toward the direction close to the double-sided display panel.

[0029] Optionally, it also includes:

[0030] A third outcoupling unit is located inside the first optical waveguide and is closer to the double-sided display panel than the first outcoupling unit. The third outcoupling unit is tilted toward the display panel.

[0031] The fourth outcoupling unit is located inside the second optical waveguide and is farther away from the double-sided display panel than the second outcoupling unit. The fourth outcoupling unit is tilted toward the display panel.

[0032] A second aspect of the embodiments of the present disclosure provides a method for controlling a near-eye display device, which is applied to any near-eye display device as described in the first aspect, and the method includes:

[0033] Controlling the working states of the first coupling-in grating and the second coupling-in grating, wherein the working states include: a light-transmitting state and a light-shielding state;

[0034] The double-sided display panel is controlled to display an image so that a first light emitted from the first light-emitting side of the double-sided display panel is coupled into the first optical waveguide through the first coupling-in grating, and is coupled out to the first observation point through the first coupling-out unit, and a second light emitted from the second light-emitting side of the double-sided display panel is coupled into the second optical waveguide through the second coupling-in grating, and is coupled out to the second observation point through the second coupling-out unit.

[0035] Optionally, controlling the working states of the first coupling-in grating and the second coupling-in grating comprises:

[0036] Controlling the first coupling grating to be in the light-shielding state in a first time period, and controlling the second coupling grating to be in the light-transmitting state in the first time period;

[0037] Controlling the first coupling grating to be in the light-transmitting state in a second time period, and controlling the second coupling grating to be in the light-shielding state in the second time period;

[0038] The controlling the double-sided display panel to display a picture includes:

[0039] Controlling the double-sided display panel to display a first frame of picture in the first time period, so that the second light emitted from the second light-emitting side in the first time period is coupled into the second optical waveguide through the second coupling grating;

[0040] The double-sided display panel is controlled to display a second frame of picture in the second time period, so that the first light emitted from the first light emitting side in the second time period is coupled into the first optical waveguide through the first coupling grating.

[0041] Optionally, the first coupling grating includes a first grating region and a second grating region arranged along a second direction, the second coupling grating includes a third grating region and a fourth grating region arranged along a third direction, and the controlling the working states of the first coupling grating and the second coupling grating includes:

[0042] The first grating region and the fourth grating region are controlled to be in the light-shielding state, and the second grating region and the third grating region are controlled to be in the light-transmitting state.

[0043] Optionally, the first coupling grating includes a first grating region and a second grating region arranged along a second direction, the second coupling grating includes a third grating region and a fourth grating region arranged along a third direction, and the controlling the working states of the first coupling grating and the second coupling grating includes:

[0044] Controlling the first grating area and the second grating area to be in the light-shielding state in a first time period, and the third grating area and the fourth grating area to be in the light-transmitting state in the first time period, and the third grating area and the fourth grating area have different diffraction angles to the second light;

[0045] The third grating area and the fourth grating area are controlled to be in the light-shielding state in the second time period, the first grating area and the second grating area are controlled to be in the light-transmitting state in the second time period, and the first grating area and the second grating area have different diffraction angles for the first light.

[0046] Optionally, the first coupling grating includes a first grating region and a second grating region arranged along a second direction, the second coupling grating includes a third grating region and a fourth grating region arranged along a third direction, and the controlling the working states of the first coupling grating and the second coupling grating includes:

[0047] Controlling the second grating area and the third grating area to be in the light-shielding state in a first time period, the first grating area and the fourth grating area to be in the light-transmitting state in the first time period, and the diffraction angle of the first grating area to the first light is different from the diffraction angle of the fourth grating area to the second light;

[0048] The first grating area and the fourth grating area are controlled to be in the light-shielding state in the second time period, the second grating area and the third grating area are controlled to be in the light-transmitting state in the second time period, and the diffraction angle of the second grating area to the first light is different from the diffraction angle of the third grating area to the second light.

[0049] Optionally, the double-sided display panel includes a first display area and a second display area arranged along a first direction, and controlling the double-sided display panel to display a picture includes:

[0050] The double-sided display panel is controlled to display a first picture in the first display area and a second picture in the second display area.

[0051] A third aspect of the embodiments of the present disclosure provides a control device for a near-eye display device, which is provided in the near-eye display device as described in any one of the first aspects, and the control device includes:

[0052] A first control unit, used for controlling the working states of the first coupling grating and the second coupling grating, wherein the working states include: a light-transmitting state and a light-shielding state;

[0053] A second control unit is used to control the double-sided display panel to display a picture, so that the first light emitted from the first light-emitting side of the double-sided display panel is coupled into the first optical waveguide through the first coupling grating, and is coupled out to the first observation point through the first coupling unit, and the second light emitted from the second light-emitting side of the double-sided display panel is coupled into the second optical waveguide through the second coupling grating, and is coupled out to the second observation point through the second coupling unit.

[0054] A third aspect of an embodiment of the present disclosure provides a computer-readable storage medium, wherein the computer-readable storage medium stores at least one computer program instruction, and the at least one computer program instruction is loaded and executed by a processor to implement the operations performed by any method described in the second aspect.

[0055] The technical solution provided in the embodiments of the present disclosure has at least the following technical effects or advantages:

[0056] The near-eye display device provided by the embodiment of the present disclosure is provided by stacking a first coupling grating and a first optical waveguide on the first light emitting side of a double-sided display panel, stacking a second coupling grating and a second optical waveguide on the second light emitting side of the double-sided display panel, arranging a first coupling-out unit in the first optical waveguide, and arranging a second coupling-out unit in the second optical waveguide, thereby, a first light emitted from the first light emitting side of the double-sided display panel is coupled into the first optical waveguide through the first coupling grating, and coupled out to a first observation point through the first coupling-out unit; a second light emitted from the second light emitting side of the double-sided display panel is coupled into the second optical waveguide through the second coupling-out grating, and coupled out to a second observation point through the second coupling-out unit. Thus, multiple out-coupling reflection surfaces are provided for the display screen of the double-sided display panel through multiple out-coupling units, so as to realize the expansion of the exit pupil distance, thereby increasing the field of view of the near-eye display device; at the same time, the double-sided display panel, the first coupling grating and the second coupling grating are arranged between the first optical waveguide and the second optical waveguide, and the two out-coupling units are arranged inside the optical waveguide, so that the structure of the near-eye display device is more compact, and the miniaturization of the product is realized.

[0057] The above description is only an overview of the technical solution provided by the embodiment of the present disclosure. In order to more clearly understand the technical means of the embodiment of the present disclosure, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present disclosure more obvious and easy to understand, the specific implementation method of the embodiment of the present disclosure is listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present disclosure. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0059] Figure 1 A partial cross-sectional structural schematic diagram of a near-eye display device according to an embodiment of the present disclosure is shown;

[0060] Figure 2 A schematic diagram of the three-dimensional structure of a double-sided display panel, a first coupling grating, and a second coupling grating according to an embodiment of the present disclosure is shown;

[0061] Figure 3 A partial plan view of a double-sided display panel according to an embodiment of the present disclosure is shown;

[0062] Figure 4 Another schematic structural diagram of the near-eye display device according to an embodiment of the present disclosure is shown;

[0063] Figure 5 A flow chart showing a method for controlling a near-eye display device according to an embodiment of the present disclosure is shown;

[0064] Figure 6 A schematic diagram showing a first working state of the near-eye display device according to an embodiment of the present disclosure is shown;

[0065] Figure 7 A schematic diagram showing a second working state of the near-eye display device according to an embodiment of the present disclosure is shown;

[0066] Figure 8 A schematic diagram showing a third working state of the near-eye display device according to an embodiment of the present disclosure is shown;

[0067] Fig. 9 A schematic diagram showing a fourth working state of the near-eye display device according to an embodiment of the present disclosure is shown;

[0068] Fig.10 A schematic diagram showing a fifth working state of the near-eye display device according to an embodiment of the present disclosure is shown;

[0069] Fig.11 A schematic diagram showing a sixth working state of the near-eye display device according to an embodiment of the present disclosure is shown;

[0070] Fig.12 A schematic diagram showing a seventh working state of the near-eye display device according to an embodiment of the present disclosure is shown;

[0071] Fig.13 A schematic structural diagram of a control device for a near-eye display device according to an embodiment of the present disclosure is shown.

[0072] Among them, 1-double-sided display panel; 11-first display area; 12-second display area; 13-third display area; 2-first coupling grating; 21-first grating area; 22-second grating area; 3-first optical waveguide; 4-first coupling-out unit; 5-second coupling grating; 51-third grating area; 52-fourth grating area; 6-second optical waveguide; 7-second coupling-out unit; 8-third coupling-out unit; 9-fourth coupling-out unit; 31-first sub-area; 32-second sub-area; D1-first observation point; D2-second observation point. DETAILED DESCRIPTION

[0073] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that the term "plurality" appearing herein includes two or more than two situations.

[0074] As used herein, "about," "approximately," "substantially" includes the stated value and the average value that is within an acceptable range of deviation from the particular value, where the acceptable range of deviation is determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0075] As used herein, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within the acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism may be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity may also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality may be, for example, the difference between the two equalities is less than or equal to 5% of either one.

[0076] In recent years, with the development of virtual reality, augmented reality, extended reality and other technologies, near-eye display devices (also known as helmet displays) can transform short-distance small-size images into long-distance enlarged virtual images in front of the user's field of view, and can also superimpose virtual images on real physical scene information in real time. Due to its characteristics of virtual-real fusion, three-dimensional immersion and hands-free real-time interaction, it has been widely used in various fields, such as military, games, film and television entertainment, live broadcasting, real estate, retail, education and medical health.

[0077] It should be noted that the cone-shaped range of the virtual image that the human eye can observe in the near-eye display device is called the field of view, the farthest distance between the human eye and the display device when the human eye can fully observe the virtual image is called the exit pupil distance, and the range in which the human eye can shake when the human eye can fully observe the virtual image at a certain exit pupil distance is called the eye movement range. For the design of near-eye display devices, how to effectively improve the field of view while ensuring the appropriate exit pupil distance and eye movement range is the main problem faced in the design of near-eye display devices.

[0078] In the related art, some near-eye display devices have unreasonable structural designs when designing structures such as the coupling structure and optical waveguide structure of the display source image. For example, a single waveguide design is used, so that the virtual image can only be emitted from the coupling unit in a limited space into the human eye, resulting in a poor field of view of the near-eye display device.

[0079] In view of this, a first aspect of an embodiment of the present disclosure provides a near-eye display device, which can increase the field of view angle of the near-eye display device to a certain extent.

[0080] The near-eye display device according to the first aspect of the embodiment of the present disclosure will be described below with reference to specific drawings.

[0081] See also Figure 1 , shows a schematic diagram of the partial cross-sectional structure of the near-eye display device of an embodiment of the present disclosure.

[0082] like Figure 1 As shown, a first aspect of an embodiment of the present disclosure provides a near-eye display device, comprising: a double-sided display panel 1, a first coupling grating 2, a first optical waveguide 3, a first coupling-out unit 4, a second coupling grating 5, a second optical waveguide 6 and a second coupling-out unit 7.

[0083] The double-sided display panel 1 has a first light-emitting side and a second light-emitting side that are arranged oppositely; a first coupling grating 2 is stacked on the first light-emitting side of the double-sided display panel 1; a first optical waveguide 3 is stacked on the side of the first coupling grating 2 away from the double-sided display panel 1; a first coupling-out unit 4 is arranged inside the first optical waveguide 3; a second coupling grating 5 is stacked on the second light-emitting side of the double-sided display panel 1; a second optical waveguide 6 is stacked on the side of the second coupling grating 5 away from the double-sided display panel 1; and a second coupling-out unit 7 is arranged inside the second optical waveguide 6. The first light emitted from the first light-emitting side of the double-sided display panel 1 is coupled into the first optical waveguide 3 through the first coupling grating 2, and coupled out to the first observation point D1 through the first coupling-out unit 4; the second light emitted from the second light-emitting side of the double-sided display panel 1 is coupled into the second optical waveguide 6 through the second coupling grating 5, and coupled out to the second observation point D2 through the second coupling-out unit 7.

[0084] Therefore, in the near-eye display device of the embodiment of the present disclosure, the display image of the double-sided display panel 1 can be coupled into the first optical waveguide 3 from the first light exit side, and the first observation point D1 can be coupled out based on the first coupling unit 4; the display image of the double-sided display panel 1 can be coupled into the second optical waveguide 6 from the second light exit side, and coupled out to the second observation point D2 based on the second coupling unit 7. Therefore, multiple coupling units are used to provide multiple coupling reflection surfaces for the display image of the double-sided display panel 1, so as to achieve the expansion of the exit pupil distance, thereby increasing the field of view of the near-eye display device; at the same time, the double-sided display panel 1, the first coupling grating 2 and the second coupling grating 5 are arranged between the first optical waveguide 3 and the second optical waveguide 6, and the two coupling units are arranged inside the optical waveguide, so that the structure of the near-eye display device is more compact, and the miniaturization of the product is achieved.

[0085] Exemplarily, the double-sided display panel 1 can be a transparent micro-display source, which can be a liquid crystal display (Liquid Crystal Displacing, LCD) source, an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display source, an active matrix quantum dot light-emitting diode (Quantum Dot Light Emitting Diodes, QLED) display source, a light-emitting diode (Light Emitting Diodes, LED) display source, a liquid crystal on silicon (Liquid Crystal on Silicon, LCOS) display source, etc. The micro-display source has the function of transparent double-sided display.

[0086] Exemplarily, the first coupling grating 2 and the second coupling grating 5 can be surface relief gratings, volume holographic gratings or electrically controlled gratings, wherein the electrically controlled gratings can be liquid crystal gratings or polymer dispersed liquid crystal (PDLC) gratings, wherein the liquid crystal gratings can be PB (Pancharatnam-Berry, geometric) phase liquid crystal gratings. Among them, the PB phase liquid crystal grating has a wide response bandwidth and unique polarization sensitivity, which is suitable for the wide viewing angle display of the near-eye display device of the embodiment of the present disclosure. In addition, the polarization characteristics of the PB phase liquid crystal grating are also beneficial to the design of the optical waveguide structure of the embodiment of the present disclosure, such as the position, size and other parameter design of the optical waveguide structure.

[0087] Exemplarily, the first optical waveguide 3 is used for totally reflecting and transmitting the first light, and the second optical waveguide 6 is used for totally reflecting and transmitting the second light. The first optical waveguide 3 and the second optical waveguide 6 can be flat optical waveguides, and can be specifically made of optical materials such as glass and acrylic plates with high visible light transmittance (for example, visible light transmittance ≥ 92%).

[0088] Exemplarily, the first outcoupling unit 4 and the second outcoupling unit 7 can be outcoupling gratings, which have a total reflection function. Specifically, they can be any grating or a combination of several gratings, such as a surface relief grating, a volume holographic grating, a controllable nano grating (such as a liquid crystal grating, a polymer dispersed liquid crystal (Polymer Dispersed Liquid Crystal, PDLC for short) grating), etc., which can be specifically selected and determined according to actual conditions, and the embodiments of the present disclosure are not limited to this.

[0089] It should be noted that when the near-eye display device is in use, the first observation point D1 may be the observation point where the left eye is located, and the second observation point D2 may be the observation point where the right eye is located; or, the first observation point D1 may be the observation point where the right eye is located, and the second observation point D2 may be the observation point where the left eye is located.

[0090] See also Figure 2 , shows a schematic diagram of the three-dimensional structure of the double-sided display panel 1, the first coupling grating 2 and the second coupling grating 5 of the embodiment of the present disclosure.

[0091] like Figure 2 As shown, in some embodiments, the double-sided display panel 1 includes a first display area 11 and a second display area 12 arranged along a first direction.

[0092] In some embodiments, the double-sided display panel 1 includes a plurality of sub-pixels (not shown), and the plurality of sub-pixels are arranged in an array along a pixel row direction and a pixel column direction. The first direction is parallel to the pixel row direction, or the first direction is parallel to the pixel column direction.

[0093] The double-sided display panel 1 includes a display screen, which can be divided into a first display area 11 and a second display area 12 according to functional requirements. It can be understood that the first display area 11 and the second display area 12 can display different pictures, or display the same picture, or jointly display part of the same picture (for example, the picture is composed of picture A and picture B, the first display area 11 displays picture A, and the second display area 12 displays picture B).

[0094] Continue to see Figure 2 The first coupling grating 2 and the second coupling grating 5 are electrically controlled gratings, such as liquid crystal gratings. The first coupling grating 2 includes a first grating area 21 and a second grating area 22 arranged along a second direction, and the first grating area 21 and the second grating area 22 are independently controlled. The second coupling grating 5 includes a third grating area 51 and a fourth grating area 52 arranged along a third direction, and the third grating area 51 and the fourth grating area 52 are independently controlled. The first direction, the second direction and the third direction are parallel to each other.

[0095] It should be noted that the first grating region 21 and the second grating region 22 are different regions of the first coupling grating 2 arranged along the second direction. The first grating region 21 and the second grating region 22 may be independently controlled by: the first grating region 21 is connected to a first control terminal, such as a first voltage control terminal, and the second grating region 22 is connected to a second control terminal, such as a second voltage control terminal. Exemplarily, a signal line may be extended from the first grating region 21, and the signal line is configured to transmit a first control voltage output from the first voltage control terminal to the first grating region 21; similarly, a signal line may be extended from the second grating region 22, and the signal line is configured to transmit a second control voltage output from the second voltage control terminal to the second grating region 22. Therefore, by independently controlling the first grating area 21 and the second grating area 22, different voltages can be applied to the first grating area 21 and the second grating area 22, so that the first grating area 21 and the second grating area 22 are in different working states, such as a light-shielding state or a light-transmitting state, and then the first grating area 21 and the second grating area 22 receive or not receive the first light emitted from the first light-emitting side of the double-sided display panel 1, so as to meet the different working scene requirements of the near-eye display device.

[0096] It can be understood that the third grating region 51 and the fourth grating region 52 are different regions of the second coupling grating 5 arranged along the third direction, and the principle of independent control of the third grating region 51 and the fourth grating region 52 is the same as the principle of independent control of the first grating region 21 and the second grating region 22, which will not be repeated here.

[0097] Combination Figure 1 and Figure 2 The orthographic projections of the first grating area 21 and the third grating area 51 on the double-sided display panel 1 at least partially overlap with the first display area 11. The orthographic projections of the second grating area 22 and the fourth grating area 52 on the double-sided display panel 1 at least partially overlap with the second display area 12.

[0098] The orthographic projection of the first grating area 21 on the double-sided display panel 1 at least partially overlaps with the first display area 11 , which can be: the orthographic projection of the first grating area 21 on the first optical waveguide 3 covers the first display area 11 ; or, the orthographic projection of the first grating area 21 on the double-sided display panel 1 basically overlaps with the first display area 11 .

[0099] The orthographic projection of the second grating area 22 on the double-sided display panel 1 at least partially overlaps with the second display area 12 , which can be: the orthographic projection of the second grating area 22 on the double-sided display panel 1 covers the second display area 12 ; or the orthographic projection of the second grating area 22 on the double-sided display panel 1 basically overlaps with the second display area 12 .

[0100] The orthographic projection of the third grating area 51 on the double-sided display panel 1 at least partially overlaps with the first display area 11 , which can be: the orthographic projection of the third grating area 51 on the first optical waveguide 3 covers the first display area 11 ; or, the orthographic projection of the third grating area 51 on the double-sided display panel 1 basically overlaps with the first display area 11 .

[0101] The orthographic projection of the fourth grating area 52 on the double-sided display panel 1 at least partially overlaps with the second display area 12 , which can be: the orthographic projection of the fourth grating area 52 on the first optical waveguide 3 covers the second display area 12 ; or, the orthographic projection of the fourth grating area 52 on the double-sided display panel 1 basically overlaps with the second display area 12 .

[0102] Thus, by dividing the double-sided display panel 1 into the first display area 11 and the second display area 12, correspondingly, the first coupling grating 2 is divided into the first grating area 21 and the second grating area 22, and the second coupling grating 5 is divided into the third grating area 51 and the fourth grating area 52, and the above-mentioned orthographic projection relationship between the display area and the grating area. Thus, the picture of the first display area 11 can be coupled into the first optical waveguide 3 from the first light exit side through the first grating area 21, the picture of the second display area 12 can be coupled into the second optical waveguide 6 from the first light exit side through the second grating area 22, the picture of the first display area 11 can be coupled into the second optical waveguide 6 from the second light exit side through the third grating area 51, and the picture of the second display area 12 can be coupled into the second optical waveguide 6 from the second light exit side through the fourth grating area 52. Thus, by controlling the different working states of the display area and the grating area, different display scene requirements of the near-eye display device can be met.

[0103] In some embodiments, the areas of the first display area 11 and the second display area 12 are substantially the same; the areas of the first grating area 21 and the second grating area 22 are substantially the same; the areas of the third grating area 51 and the fourth grating area 52 are substantially the same; for example: the areas of the first display area 11, the first grating area 21 and the third grating area 51 are substantially the same, and the areas of the second display area 12, the fourth display area and the fourth grating area 52 are substantially the same.

[0104] It is understood that in the embodiments of the present disclosure, the areas being substantially the same may be: each accounting for 50%, or the area difference between the two being within an acceptable deviation range. Wherein, "substantially" includes the area described and an average value within an acceptable deviation range of a specific area, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system).

[0105] See also Figure 3 , shows a partial plan view of the double-sided display panel 1 of an embodiment of the present disclosure.

[0106] like Figure 3 As shown, in some embodiments, the double-sided display panel 1 further includes: a third display area 13, located between the first display area 11 and the second display area 12; the first grating area 21 has a first projection area on the first optical waveguide 3, the second grating area 22 has a second projection area on the first optical waveguide 3, the first projection area and the second projection area have adjacent boundaries that overlap, and are located in the third display area 13; the third grating area 51 has a third projection area on the first optical waveguide 3, the fourth grating area 52 has a fourth projection area on the first optical waveguide 3, the third projection area and the fourth projection area have adjacent boundaries that overlap, and are located in the third display area 13.

[0107] It can be understood that when the first display area 11 and the second display area 12 display images respectively, the third display area 13 is set, and the third display area 13 displays a normally black image, so that the third display area 13 serves as a border similar to the first display area 11 and the second display area 12, which prevents the images of the first display area 11 and the second display area 12 from crosstalking with each other.

[0108] It can be understood that when the first display area 11 and the second display area 12 display a picture together, the third display area 13 can display the picture together with the first display area 11 and the third display area 13. For example, picture A, picture B and picture C form a complete picture, the first display area 11 displays picture A, the second display area 12 displays picture B, and the third display area 13 displays picture C.

[0109] Exemplarily, the adjacent boundaries of the first projection area and the second projection area overlap, and being located in the third display area 13 may be: the adjacent boundaries of the first projection area and the second projection area overlap with the center line of the third display area 13. Thus, the first grating area 21 covers half of the first display area 11 and the third display area 13, and the second grating area 22 covers the other half of the second display area 12 and the third display area 13.

[0110] Exemplarily, the adjacent boundaries of the third projection area and the fourth projection area overlap, and the third display area 13 may be located such that: the adjacent boundaries of the third projection area and the fourth projection area overlap with the center line of the third display area 13. Thus, the third grating area 51 covers half of the first display area 11 and the third display area 13, and the fourth grating area 52 covers the other half of the second display area 12 and the third display area 13.

[0111] In some embodiments, along the first direction, the ratio of the width of the third display area 13 to the width of the first display area 11 or the second display area 12 is in the range of 0.1-0.2, for example, 0.1, 0.15, 0.18 or 0.2. It is understandable that the third display area 13 can be set to be smaller, so that when the first display area 11 and the second display area 12 display images respectively, the display effects of the first display area 11 and the second display area 12 are not affected.

[0112] See also Figure 4 , shows another structural schematic diagram of the near-eye display device of an embodiment of the present disclosure.

[0113] In some embodiments, the first coupling grating 2, the second coupling grating 5 and the double-sided display panel 1 constitute an inter-waveguide component; there is a spacing area between the first optical waveguide 3 and the second optical waveguide 6, and the spacing area includes a first sub-area 31 and a second sub-area 32, the first sub-area 31 is provided with the inter-waveguide component, and the second sub-area 32 is a gap area; at least one side of the inter-waveguide component is flush with at least one side of the first optical waveguide 3 and at least one side of the second optical waveguide 6, for example: the first side of the inter-waveguide component is flush with the first side of the first optical waveguide 3 and the first side of the second optical waveguide 6, wherein the first side refers to the side away from the second sub-area 32.

[0114] Thus, by arranging at least one side of the inter-waveguide component flush with at least one side of the first optical waveguide 3 and at least one side of the second optical waveguide 6, the light emitted from the double-sided display panel 1 can be completely coupled into the optical waveguide, thereby ensuring the integrity of light transmission; since the light is transmitted from one side (corresponding to the first sub-region 31) to the other side (corresponding to the second sub-region 32) inside the optical waveguide, at least one side of the inter-waveguide component is arranged flush with at least one side of the first optical waveguide 3 and at least one side of the second optical waveguide 6, respectively, so that the optical waveguide can be fully utilized and structural waste can be avoided.

[0115] In some embodiments, the second coupling unit 7 is closer to the double-sided display panel 1 than the first coupling unit 4, and the first coupling unit 4 and the second coupling unit 7 are tilted toward the direction close to the double-sided display panel 1, so that the second coupling unit 7 can couple the second light coupled into the second optical waveguide 6 to the first observation point D1, and the first coupling unit 4 can couple the first light coupled into the first optical waveguide 3 to the second observation point D2.

[0116] In some embodiments, the near-eye display device further includes: a third outcoupling unit 8 and a fourth outcoupling unit 9. The third outcoupling unit 8 is located inside the first optical waveguide 3 and is closer to the double-sided display panel 1 than the first outcoupling unit 4, and the third outcoupling unit 8 is tilted toward the display panel; the fourth outcoupling unit 9 is located inside the second optical waveguide 6 and is farther away from the double-sided display panel 1 than the second outcoupling unit 7, and the fourth outcoupling unit 9 is tilted toward the display panel.

[0117] Then, in some scenarios, the third outcoupling unit 8 can couple out the first light coupled into the first optical waveguide 3 to the first observation point D1, and the first outcoupling unit 4 can couple out the first light coupled into the first optical waveguide 3 to the second observation point D2. In other scenarios, the second outcoupling unit 7 can couple out the second light coupled into the second optical waveguide 6 to the first observation point D1, and the fourth outcoupling unit 9 can couple out the second light coupled into the second optical waveguide 6 to the second observation point D2. In this way, different display requirements of the near-eye display device can be met.

[0118] See also Figure 5 , showing a flow chart of a control method for a near-eye display device according to an embodiment of the present disclosure.

[0119] like Figure 5 As shown, a second aspect of an embodiment of the present disclosure provides a control method for a near-eye display device, which is applied to any near-eye display device as described in the first aspect. The method can be executed in a controller provided in the near-eye device, and the method includes:

[0120] Step S10. Controlling the working states of the first coupling grating and the second coupling grating, wherein the working states include: a light-transmitting state and a light-shielding state;

[0121] Exemplarily, by applying different voltages to the first coupling grating and the second coupling grating, the first coupling grating can be operated in a light-transmitting state or a light-shielding state, and the second coupling grating can be operated in a light-transmitting state or a light-shielding state.

[0122] Step S20. Control the double-sided display panel to display an image, so that the first light emitted from the first light-emitting side of the double-sided display panel is coupled into the first optical waveguide through the first coupling grating, and is coupled out to the first observation point through the first coupling unit, and the second light emitted from the second light-emitting side of the double-sided display panel is coupled into the second optical waveguide through the second coupling grating, and is coupled out to the second observation point through the second coupling unit.

[0123] Therefore, the control method of the near-eye display device provided in the embodiment of the present disclosure controls the different working states of the first coupling grating and the second coupling grating, as well as the display state of the double-sided display panel, so that when the double-sided display panel, the first coupling grating and the second coupling grating are in different states, different display requirements of the near-eye display device can be met, thereby improving the user experience.

[0124] See also Figure 6 , which shows a schematic diagram of a first working state of the near-eye display device according to an embodiment of the present disclosure; see Figure 7 , showing a schematic diagram of a second working state of the near-eye display device of an embodiment of the present disclosure.

[0125] Combination Figure 6 and Figure 7 In some embodiments, controlling the working states of the first coupling-in grating and the second coupling-in grating includes:

[0126] Step S11 B. controlling the first coupling grating to be in the light-shielding state in a first time period, and the second coupling grating to be in the light-transmitting state in the first time period;

[0127] Step S12B. controlling the first coupling grating to be in the light-transmitting state in the second time period, and the second coupling grating to be in the light-shielding state in the second time period;

[0128] The controlling the double-sided display panel to display a picture includes:

[0129] Step S21 B. controlling the double-sided display panel to display a first frame of picture in the first time period, so that the second light emitted from the second light emitting side in the first time period is coupled into the second optical waveguide through the second coupling grating;

[0130] Step S22B. Control the double-sided display panel to display a second frame of picture in the second time period, so that the first light emitted from the first light emitting side in the second time period is coupled into the first optical waveguide through the first coupling grating.

[0131] It can be understood that when the first display area and the second display area display the same picture together, the third display area can display the same picture together with the first display area and the second display area.

[0132] It can be understood that, in the first time period, the second light is coupled from the second coupling grating to the second optical waveguide, is totally reflected in the second optical waveguide and transmitted to the second coupling unit, and is coupled out by the second coupling unit to the first observation point, such as the observation point where the left eye is located. In the second time period, the first light is coupled from the first coupling grating to the first optical waveguide, is reflected in the first optical waveguide and transmitted to the first coupling unit, and is coupled out by the first coupling unit to the second observation point, such as the observation point where the left eye is located.

[0133] As a result, both the left eye and the right eye can receive a large-size image of the double-sided display panel, such as receiving images of the first display area and the second display area, or receiving images of the first display area, the second display area, and the third display area. This can increase the size of the received image, and then the human brain integrates the image information received by the left eye and the right eye to obtain a complete virtual image with depth, thereby increasing the field of view angle range.

[0134] See also Figure 8 , shows a schematic diagram of a third working state of the near-eye display device of an embodiment of the present disclosure.

[0135] like Figure 8 As shown, in some embodiments, the first coupling grating includes a first grating region and a second grating region arranged along a second direction, the second coupling grating includes a third grating region and a fourth grating region arranged along a third direction, and the controlling the working states of the first coupling grating and the second coupling grating includes:

[0136] Step S10A. Controlling the first grating region and the fourth grating region to be in the light-shielding state, and the second grating region and the third grating region to be in the light-transmitting state;

[0137] The double-sided display panel includes a first display area and a second display area arranged along a first direction, and controlling the double-sided display panel to display a picture includes:

[0138] Step S20A: Control the double-sided display panel to display a first picture in the first display area and to display a second picture in the second display area.

[0139] It can be understood that when the first display area and the second display area display images respectively, the third display area always displays a normally black image to prevent the first image and the second image from crosstalking with each other.

[0140] It can be understood that when the first grating area and the fourth grating area are in the light-shielding state, the first picture in the first display area cannot enter the first optical waveguide from the first light-exiting side, and the second picture in the second display area cannot enter the second optical waveguide from the second light-exiting side. At this time, the first light is coupled into the first optical waveguide from the second grating area, and is transmitted to the first coupling-out unit by total reflection in the first optical waveguide, and is coupled out by the first coupling-out unit to the second observation point, such as the observation point where the right eye is located. In addition, the second light is coupled into the second optical waveguide from the third grating area, and is transmitted to the second coupling-out unit by total reflection in the second optical waveguide, and is coupled out by the second coupling-out unit to the first observation point, such as the observation point where the left eye is located.

[0141] It can be understood that the first picture and the second picture can be pictures of the same target object at different angles, such as a picture simulating left eye observation and a picture simulating right eye observation. Then, the pictures taken at different angles are transmitted to the left eye and the right eye respectively, so that after receiving different pictures, the human eye processes the pictures based on the visual suspension effect of the human eye to obtain complete virtual image information, which can significantly increase the field of view and improve the user experience.

[0142] It is understandable that in step S20A, since the left eye and the right eye can receive display images at different angles at the same time, the double-sided display panel can adopt a low refresh rate, thereby reducing the refresh rate requirement for the double-sided display panel.

[0143] See also Fig. 9 , which shows a schematic diagram of a fourth working state of the near-eye display device according to an embodiment of the present disclosure; see Fig.10 , shows a schematic diagram of the fifth working state of the near-eye display device of an embodiment of the present disclosure.

[0144] Combination Fig. 9 and Fig.10 In some embodiments, the first coupling grating includes a first grating region and a second grating region arranged along a second direction, the second coupling grating includes a third grating region and a fourth grating region arranged along a third direction, and the controlling the working states of the first coupling grating and the second coupling grating includes:

[0145] Step S11 C. controlling the first grating area and the second grating area to be in the light-shielding state in a first time period, the third grating area and the fourth grating area to be in the light-transmitting state in the first time period, and the third grating area and the fourth grating area have different diffraction angles for the second light;

[0146] Step S12C. Control the third grating area and the fourth grating area to be in the light-shielding state in the second time period, and the first grating area and the second grating area to be in the light-transmitting state in the second time period, and the first grating area and the second grating area have different diffraction angles for the first light.

[0147] It can be understood that by applying different voltages to the third grating area and the fourth grating area, the diffraction angles of the third grating area and the fourth grating area to the second light can be different; similarly, by applying different voltages to the first grating area and the second grating area, the diffraction angles of the first grating area and the second grating area to the second light can be different.

[0148] The diffraction angle of the grating area to the light may refer to: the angle of the light relative to the plane where the grating is located when it is emitted from the grating area. For example, the diffraction angle corresponding to the first grating area and the third grating area is α, and the diffraction angle corresponding to the second grating area and the fourth grating area is β. Among them, when the diffraction angle is α, the first light does not reflect on the third out-coupling unit after entering the first optical waveguide, and can be transmitted to the first out-coupling unit by total reflection; when the diffraction angle is β, the first light is totally reflected on the third out-coupling unit and coupled out after entering the first optical waveguide. In addition, when the diffraction angle is α, the second light does not reflect on the second out-coupling unit after entering the second optical waveguide, and can be transmitted to the fourth out-coupling unit by total reflection; when the diffraction angle is β, the second light is totally reflected on the second out-coupling unit and coupled out after entering the second optical waveguide.

[0149] In some embodiments, the double-sided display panel includes a first display area and a second display area arranged along a first direction, and controlling the double-sided display panel to display a picture includes:

[0150] The double-sided display panel is controlled to display a first picture in the first display area and a second picture in the second display area.

[0151] For example, in the first time period, the first display area is controlled to display the first picture of the first frame, and the second display area is controlled to display the second picture of the first frame. In the first time period, the second light of the first display area is coupled into the second optical waveguide from the third grating area at a diffraction angle α, and is transmitted to the second coupling unit by total reflection in the second optical waveguide, and is coupled out to the second observation point by the second coupling unit; the second light of the second display area is coupled into the second optical waveguide from the fourth grating area at a diffraction angle β, and is transmitted to the fourth coupling unit by total reflection in the second optical waveguide, and is coupled out to the first observation point by the fourth coupling unit.

[0152] For example, in the second time period, the first display area is controlled to display the first picture of the second frame, and the second display area is controlled to display the second picture of the second frame. In the second time period, the first light in the first display area is coupled into the first optical waveguide from the first grating area at a diffraction angle α, and is transmitted to the first coupling unit by total reflection in the first optical waveguide, and is coupled out to the second observation point by the first coupling unit; the first light in the first display area is coupled into the first optical waveguide from the second grating area at a diffraction angle β, and is transmitted to the third coupling unit by total reflection in the first optical waveguide, and is coupled out to the first observation point by the third coupling unit.

[0153] As a result, the left eye and the right eye can simultaneously receive virtual images of different screens, and then the human brain integrates the image information received by the left eye and the right eye, and obtains the entire virtual image after splicing, thereby realizing a wide viewing angle display. In addition, the double-sided display panel can adopt a high refresh rate, and virtual images of different depths can be transmitted based on different waveguides. Based on the visual suspension effect of the human eye, a complete virtual image with depth and multiple layers can be obtained.

[0154] See also Fig.11 , which shows a sixth working state schematic diagram of the near-eye display device according to an embodiment of the present disclosure; see Fig.12 , shows a schematic diagram of the seventh working state of the near-eye display device of an embodiment of the present disclosure.

[0155] Combination Fig.11 and Fig.12 The first coupling grating includes a first grating region and a second grating region arranged along a second direction, the second coupling grating includes a third grating region and a fourth grating region arranged along a third direction, and the controlling the working states of the first coupling grating and the second coupling grating includes:

[0156] Step S11D. Control the second grating area and the third grating area to be in the light-shielding state in the first time period, the first grating area and the fourth grating area to be in the light-transmitting state in the first time period, and the diffraction angle of the first grating area to the first light is different from the diffraction angle of the fourth grating area to the second light;

[0157] Step S12D. Control the first grating area and the fourth grating area to be in the light-shielding state in the second time period, the second grating area and the third grating area to be in the light-transmitting state in the second time period, and the diffraction angle of the second grating area to the first light is different from the diffraction angle of the third grating area to the second light.

[0158] In some embodiments, the double-sided display panel includes a first display area and a second display area arranged along a first direction, and controlling the double-sided display panel to display a picture includes:

[0159] The double-sided display panel is controlled to display a first picture in the first display area and a second picture in the second display area.

[0160] For example, in the first time period, the first display area is controlled to display the first picture of the first frame, and the second display area is controlled to display the second picture of the first frame. In the first time period, the first light of the first display area is coupled into the first optical waveguide from the first grating area at a diffraction angle α, and is transmitted to the first coupling unit by total reflection in the first optical waveguide, and is coupled out to the second observation point by the first coupling unit; the second light of the second display area is coupled into the second optical waveguide from the fourth grating area at a diffraction angle β, and is transmitted to the fourth coupling unit by total reflection in the second optical waveguide, and is coupled out to the first observation point by the fourth coupling unit.

[0161] For example, in the second time period, the first display area is controlled to display the first picture of the second frame, and the second display area is controlled to display the second picture of the second frame. In the second time period, the first light of the second display area is coupled into the first optical waveguide from the second grating area at a diffraction angle β, and is transmitted to the third coupling unit by total reflection in the first optical waveguide, and is coupled out to the first observation point by the third coupling unit; the second light of the first display area is coupled into the second optical waveguide from the third grating area at a diffraction angle α, and is transmitted to the fourth coupling unit by total reflection in the second optical waveguide, and is coupled out to the second observation point by the fourth coupling unit.

[0162] As a result, the left eye and the right eye can simultaneously receive virtual images of different screens, and then the human brain integrates the image information received by the left eye and the right eye, and obtains the entire virtual image after splicing, thereby realizing a wide viewing angle display. In addition, the double-sided display panel can adopt a high refresh rate, and virtual images of different depths can be transmitted based on different waveguides. Based on the visual suspension effect of the human eye, a complete virtual image with depth and multiple layers can be obtained.

[0163] See also Fig.13 , shows a schematic structural diagram of a control device for a near-eye display device according to an embodiment of the present disclosure.

[0164] like Fig.13 As shown, a third aspect of an embodiment of the present disclosure provides a control device 200 of a near-eye display device, which is provided in any near-eye display device as described in the first aspect, and the control device 200 includes:

[0165] A first control unit 201, used to control the working states of the first coupling grating and the second coupling grating, wherein the working states include: a light-transmitting state and a light-shielding state;

[0166] The second control unit 202 is used to control the double-sided display panel to display a picture, so that the first light emitted from the first light-emitting side of the double-sided display panel is coupled into the first optical waveguide through the first coupling grating, and is coupled out to the first observation point through the first coupling unit, and the second light emitted from the second light-emitting side of the double-sided display panel is coupled into the second optical waveguide through the second coupling grating, and is coupled out to the second observation point through the second coupling unit.

[0167] Therefore, the control device of the near-eye display device provided in the embodiment of the present disclosure controls the different working states of the first coupling grating and the second coupling grating, as well as the display state of the double-sided display panel, so that when the double-sided display panel, the first coupling grating and the second coupling grating are in different states, different display requirements of the near-eye display device can be met, thereby improving the user experience.

[0168] A third aspect of an embodiment of the present disclosure provides a computer-readable storage medium, wherein the computer-readable storage medium stores at least one computer program instruction, and the at least one computer program instruction is loaded and executed by a processor to implement the operations performed by any method described in the second aspect.

[0169] The computer readable storage medium may be a portable compact disk read-only memory (CD-ROM) and include program code, and may be run on a terminal device, such as a personal computer. However, the computer readable storage medium of the present disclosure is not limited thereto, and in the present disclosure, the readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, apparatus, or device.

[0170] The readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection with one or more conductors, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0171] Program code for performing the operations of the present disclosure may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., through the Internet using an Internet service provider).

[0172] In the above description, the technical details such as the composition of each layer of the product are not described in detail. However, those skilled in the art should understand that various technical means can be used to form layers, regions, etc. of desired shapes. Although each embodiment is described separately above, it does not mean that the measures in each embodiment cannot be used in combination to advantage.

[0173] In addition, those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure is limited to these examples. Based on the concept of the present disclosure, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present disclosure as described above, which are not provided in detail for the sake of simplicity.

[0174] Although the preferred embodiments of the present disclosure have been described, those skilled in the art may make additional 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 falling within the scope of the present disclosure.

Claims

1. A near-eye display device, characterized in that: include: A double-sided display panel having a first light-emitting side and a second light-emitting side arranged opposite to each other; A first coupling grating, stacked and arranged on the first light-emitting side of the double-sided display panel; A first optical waveguide, stacked and arranged on a side of the first coupling grating away from the double-sided display panel; A first outcoupling unit, arranged inside the first optical waveguide; A second coupling grating, stacked and arranged on the second light-emitting side of the double-sided display panel; A second optical waveguide is stacked and arranged on a side of the second coupling-in grating away from the double-sided display panel; A second outcoupling unit is arranged inside the second optical waveguide; The first light emitted from the first light-emitting side of the double-sided display panel is coupled into the first optical waveguide through the first coupling-in grating, and is coupled out to the first observation point through the first coupling-out unit; The second light emitted from the second light emitting side of the double-sided display panel is coupled into the second optical waveguide through the second coupling-in grating, and is coupled out to the second observation point through the second coupling-out unit.

2. The near-eye display device according to claim 1, characterized in that: The double-sided display panel includes a first display area and a second display area arranged along a first direction; The first coupling grating and the second coupling grating are electrically controlled gratings, the first coupling grating includes a first grating area and a second grating area arranged along a second direction, the first grating area and the second grating area are independently controlled, the second coupling grating includes a third grating area and a fourth grating area arranged along a third direction, the third grating area and the fourth grating area are independently controlled, and the first direction, the second direction and the third direction are parallel to each other; The orthographic projections of the first grating area and the third grating area on the double-sided display panel respectively overlap at least partially with the first display area; The orthographic projections of the second grating area and the fourth grating area on the double-sided display panel respectively overlap at least partially with the second display area.

3. The near-eye display device according to claim 2, characterized in that: The orthographic projections of the first grating area and the third grating area on the double-sided display panel respectively cover the first display area; The orthographic projections of the second grating area and the fourth grating area on the double-sided display panel respectively cover the second display area.

4. The near-eye display device according to claim 2, characterized in that: The areas of the first display area and the second display area are substantially the same; the areas of the first grating area and the second grating area are substantially the same; and the areas of the third grating area and the fourth grating area are substantially the same.

5. The near-eye display device according to any one of claims 2 to 4, characterized in that: The double-sided display panel further includes: a third display area located between the first display area and the second display area; The first grating region has a first projection area on the first optical waveguide, the second grating region has a second projection area on the first optical waveguide, and adjacent boundaries of the first projection area and the second projection area overlap and are located in the third display area; The third grating area has a third projection area on the first optical waveguide, the fourth grating area has a fourth projection area on the first optical waveguide, and adjacent boundaries of the third projection area and the fourth projection area overlap and are located in the third display area.

6. The near-eye display device according to claim 5, characterized in that: Along the first direction, a ratio of a width of the third display area to a width of the first display area or a width of the second display area is in a range of 0.1-0.

2.

7. The near-eye display device according to claim 1, characterized in that: The first coupling grating, the second coupling grating and the double-sided display panel constitute an inter-waveguide component; There is a spacing region between the first optical waveguide and the second optical waveguide, the spacing region includes a first sub-region and a second sub-region, the first sub-region is provided with the inter-waveguide component, and the second sub-region is a gap region; At least one side of the inter-waveguide component is flush with at least one side of the first optical waveguide and at least one side of the second optical waveguide.

8. The near-eye display device according to claim 1, characterized in that: The second coupling unit is closer to the double-sided display panel than the first coupling unit, and the first coupling unit and the second coupling unit are arranged obliquely toward the direction of approaching the double-sided display panel.

9. The near-eye display device according to claim 1 or 8, characterized in that: Also includes: A third outcoupling unit is located inside the first optical waveguide and is closer to the double-sided display panel than the first outcoupling unit. The third outcoupling unit is tilted toward the display panel. The fourth outcoupling unit is located inside the second optical waveguide and is farther away from the double-sided display panel than the second outcoupling unit. The fourth outcoupling unit is tilted toward the display panel.

10. A method for controlling a near-eye display device, characterized in that: Applied to the near-eye display device according to any one of claims 1 to 9, the method comprises: Controlling the working states of the first coupling-in grating and the second coupling-in grating, wherein the working states include: a light-transmitting state and a light-shielding state; The double-sided display panel is controlled to display an image so that a first light emitted from the first light-emitting side of the double-sided display panel is coupled into the first optical waveguide through the first coupling-in grating, and is coupled out to the first observation point through the first coupling-out unit, and a second light emitted from the second light-emitting side of the double-sided display panel is coupled into the second optical waveguide through the second coupling-in grating, and is coupled out to the second observation point through the second coupling-out unit.

11. The method according to claim 10, characterized in that The controlling the working states of the first coupling-in grating and the second coupling-in grating comprises: Controlling the first coupling grating to be in the light-shielding state in a first time period, and controlling the second coupling grating to be in the light-transmitting state in the first time period; Controlling the first coupling grating to be in the light-transmitting state in a second time period, and controlling the second coupling grating to be in the light-shielding state in the second time period; The controlling the double-sided display panel to display a picture includes: Controlling the double-sided display panel to display a first frame of picture in the first time period, so that the second light emitted from the second light-emitting side in the first time period is coupled into the second optical waveguide through the second coupling grating; The double-sided display panel is controlled to display a second frame of picture in the second time period, so that the first light emitted from the first light emitting side in the second time period is coupled into the first optical waveguide through the first coupling grating.

12. The method according to claim 10, characterized in that The first coupling grating includes a first grating region and a second grating region arranged along a second direction, the second coupling grating includes a third grating region and a fourth grating region arranged along a third direction, and the controlling the working states of the first coupling grating and the second coupling grating includes: The first grating region and the fourth grating region are controlled to be in the light-shielding state, and the second grating region and the third grating region are controlled to be in the light-transmitting state.

13. The method according to claim 10, characterized in that The first coupling grating includes a first grating region and a second grating region arranged along a second direction, the second coupling grating includes a third grating region and a fourth grating region arranged along a third direction, and the controlling the working states of the first coupling grating and the second coupling grating includes: Controlling the first grating area and the second grating area to be in the light-shielding state in a first time period, and the third grating area and the fourth grating area to be in the light-transmitting state in the first time period, and the third grating area and the fourth grating area have different diffraction angles to the second light; The third grating area and the fourth grating area are controlled to be in the light-shielding state in the second time period, the first grating area and the second grating area are controlled to be in the light-transmitting state in the second time period, and the first grating area and the second grating area have different diffraction angles for the first light.

14. The method according to claim 10, characterized in that The first coupling grating includes a first grating region and a second grating region arranged along a second direction, the second coupling grating includes a third grating region and a fourth grating region arranged along a third direction, and the controlling the working states of the first coupling grating and the second coupling grating includes: Controlling the second grating area and the third grating area to be in the light-shielding state in a first time period, the first grating area and the fourth grating area to be in the light-transmitting state in the first time period, and the diffraction angle of the first grating area to the first light is different from the diffraction angle of the fourth grating area to the second light; The first grating area and the fourth grating area are controlled to be in the light-shielding state in the second time period, the second grating area and the third grating area are controlled to be in the light-transmitting state in the second time period, and the diffraction angle of the second grating area to the first light is different from the diffraction angle of the third grating area to the second light.

15. The method according to any one of claims 12 to 14, characterized in that: The double-sided display panel includes a first display area and a second display area arranged along a first direction, and controlling the double-sided display panel to display a picture includes: The double-sided display panel is controlled to display a first picture in the first display area and a second picture in the second display area.

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