Near-eye display device and its control method

Abstract

This disclosure provides a near-eye display device and its control method. The near-eye display device includes: a double-sided display panel, a first coupling grating, a first optical waveguide, a first coupling unit, a second coupling grating, a second optical waveguide, and a second coupling unit. The double-sided display panel has a first light-emitting side and a second light-emitting side disposed opposite to each other; the first coupling grating is stacked on the first light-emitting side of the double-sided display panel; the first optical waveguide is stacked on the side of the first coupling grating away from the double-sided display panel; the first coupling unit is disposed inside 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 the side of the second coupling grating away from the double-sided display panel; and the second coupling unit is disposed inside the second optical waveguide.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a near-eye display device and its control method. Background Technology

[0002] Near-eye display devices are used to image small images at close range into magnified virtual images at a distance in front of the user's field of vision. They can also overlay virtual images onto real physical scene information in real time. They have the characteristics of virtual-real fusion, three-dimensional immersion, and hands-free real-time interaction, and are widely used in various fields.

[0003] In related technologies, some near-eye display devices have poor field of view due to unreasonable structural design in the design of the coupling structure of the display source image and the optical waveguide structure. Summary of the Invention

[0004] A first aspect of this disclosure provides a near-eye display device, comprising:

[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 is stacked on the first light-emitting side of the double-sided display panel;

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

[0008] The first coupling unit is disposed inside the first optical waveguide;

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

[0010] The second optical waveguide is stacked and disposed on the side of the second coupling grating away from the double-sided display panel;

[0011] The second coupling unit is disposed inside the second optical waveguide;

[0012] The first light emitted from the first light-emitting side of the dual-sided display panel is coupled into the first optical waveguide through the first coupling grating, and coupled out to the first observation point through the first coupling 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 grating, and coupled out to the second observation point through the second coupling 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 and second coupling gratings are electrically controlled gratings. The first coupling grating includes a first grating region and a second grating region arranged along a second direction. The first grating region and the second grating region are independently controlled. The second coupling grating includes a third grating region and a fourth grating region arranged along a third direction. The third grating region and the fourth grating region are independently controlled. The first direction, the second direction, and the third direction are parallel to each other.

[0016] The first grating area and the third grating area are projected onto the double-sided display panel in a way that at least partially overlaps with the first display area.

[0017] The orthographic projections of the second grating area and the fourth grating area onto 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 onto the double-sided display panel respectively cover the first display area;

[0019] The second grating area and the fourth grating area are projected onto the double-sided display panel and respectively cover the second display area.

[0020] Optionally, 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.

[0021] Optionally, the dual-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, and the second grating region has a second projection area on the first optical waveguide. The adjacent boundaries of the first projection area and the second projection area coincide and are located in the third display area.

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

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

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

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

[0027] At least one side of the waveguide assembly is flush with at least one side of the first optical waveguide and at least one side of the second optical waveguide, respectively.

[0028] Optionally, the second coupling unit is closer to the dual-sided display panel than the first coupling unit, and the first coupling unit and the second coupling unit are inclined towards the dual-sided display panel.

[0029] Optionally, it also includes:

[0030] The third coupling unit is located inside the first optical waveguide and is closer to the double-sided display panel than the first coupling unit. The third coupling unit is inclined towards the display panel.

[0031] The fourth coupling unit is located inside the second optical waveguide and is further away from the double-sided display panel than the second coupling unit. The fourth coupling unit is inclined towards the display panel.

[0032] A second aspect of this disclosure provides a control method for a near-eye display device, applied to any of the near-eye display devices described in the first aspect, the method comprising:

[0033] The operating states of the first coupling grating and the second coupling grating are controlled, and the operating states include: a light-transmitting state and a light-blocking state;

[0034] The display screen of the dual-sided display panel is controlled so that the first light emitted from the first light-emitting side of the dual-sided display panel is coupled into the first optical waveguide through the first coupling grating and coupled out to the first observation point through the first coupling unit; the second light emitted from the second light-emitting side of the dual-sided display panel is coupled into the second optical waveguide through the second coupling grating and coupled out to the second observation point through the second coupling unit.

[0035] Optionally, controlling the operating states of the first coupling grating and the second coupling grating includes:

[0036] The first coupling grating is controlled to be in the light-blocking state during a first time period, and the second coupling grating is controlled to be in the light-transmitting state during the first time period;

[0037] The first coupling grating is controlled to be in the light-transmitting state during the second time period, and the second coupling grating is controlled to be in the light-blocking state during the second time period;

[0038] The control of the display screen on the dual-sided display panel includes:

[0039] The dual-sided display panel is controlled to display a first frame during the first time period, so that the second light emitted from the second light-emitting side during the first time period is coupled into the second optical waveguide through the second coupling grating;

[0040] The dual-sided display panel is controlled to display a second frame during the second time period, so that the first light emitted from the first light-emitting side during 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, and the second coupling grating includes a third grating region and a fourth grating region arranged along a third direction. Controlling the operating states of the first coupling grating and the second coupling grating includes:

[0042] The first grating area and the fourth grating area are controlled to be in the light-blocking state, and the second grating area and the third grating area 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, and the second coupling grating includes a third grating region and a fourth grating region arranged along a third direction. Controlling the operating states of the first coupling grating and the second coupling grating includes:

[0044] The first grating region and the second grating region are controlled to be in the light-blocking state during the first time period, and the third grating region and the fourth grating region are in the light-transmitting state during the first time period, and the diffraction angles of the third grating region and the fourth grating region for the second light are different;

[0045] The third grating region and the fourth grating region are controlled to be in the light-blocking state during the second time period, while the first grating region and the second grating region are in the light-transmitting state during the second time period, and the first grating region and the second grating region 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, and the second coupling grating includes a third grating region and a fourth grating region arranged along a third direction. Controlling the operating states of the first coupling grating and the second coupling grating includes:

[0047] The second grating region and the third grating region are controlled to be in the light-blocking state during the first time period, and the first grating region and the fourth grating region are in the light-transmitting state during the first time period, and the diffraction angle of the first grating region to the first light is different from the diffraction angle of the fourth grating region to the second light.

[0048] The first grating region and the fourth grating region are controlled to be in the light-blocking state during the second time period, and the second grating region and the third grating region are in the light-transmitting state during the second time period. The diffraction angle of the second grating region to the first light is different from that of the third grating region 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 display of the image on the double-sided display panel includes:

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

[0051] A third aspect of this disclosure provides a control device for a near-eye display device, disposed in any of the near-eye display devices described in the first aspect, the control device comprising:

[0052] A first control unit is used to control the operating states of the first coupling grating and the second coupling grating, the operating states including: a light-transmitting state and a light-blocking state;

[0053] The second control unit is used to control the display screen of the double-sided display panel 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 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 coupled out to the second observation point through the second coupling unit.

[0054] A third aspect of this disclosure provides a computer-readable storage medium storing at least one computer program instruction, which is loaded and executed by a processor to perform the operations as described in any of the methods in the second aspect.

[0055] The technical solutions provided in this disclosure have at least the following technical effects or advantages:

[0056] The near-eye display device provided in this embodiment of the present disclosure comprises a first coupling grating and a first optical waveguide stacked on the first light-emitting side of a double-sided display panel, a second coupling grating and a second optical waveguide stacked on the second light-emitting side of the double-sided display panel, a first coupling unit disposed within the first optical waveguide, and a second coupling unit disposed within the second optical waveguide. Thus, a first light ray 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 unit; a second light ray 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 coupled out to a second observation point through the second coupling unit. Therefore, by using multiple coupling units to provide multiple coupling reflective surfaces for the display screen of the double-sided display panel, the exit pupil distance is extended, thereby increasing the field of view of the near-eye display device. At the same time, by placing the double-sided display panel, the first coupling grating, and the second coupling grating between the first and second optical waveguides, and placing the two coupling units inside the optical waveguides, the structure of the near-eye display device becomes more compact, achieving product miniaturization.

[0057] The above description is merely an overview of the technical solutions provided by the embodiments of this disclosure. In order to better understand the technical means of the embodiments of this disclosure and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this disclosure more apparent and understandable, specific implementation methods of the embodiments of this disclosure are described below. Attached Figure Description

[0058] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the 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 three-dimensional structural schematic diagram 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 structural schematic diagram of a near-eye display device according to an embodiment of the present disclosure is shown;

[0063] Figure 5 A flowchart illustrating a control method for a near-eye display device according to an embodiment of the present disclosure is shown;

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

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

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

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

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

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

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

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

[0072] Wherein, 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 unit; 5-second coupling grating; 51-third grating area; 52-fourth grating area; 6-second optical waveguide; 7-second coupling unit; 8-third coupling unit; 9-fourth coupling unit; 31-first sub-region; 32-second sub-region; D1-first observation point; D2-second observation point. Detailed Implementation

[0073] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the term "a plurality of" as used herein includes two or more cases.

[0074] As used herein, “about,” “approximately,” “close to,” or “basically” includes the value stated and the average value within an acceptable range of deviation from the given value, wherein the acceptable range of deviation is determined by a person skilled in the art taking into account the measurement under discussion and the error associated with the measurement of the given quantity (i.e., the limitations of the measurement system).

[0075] As used herein, “parallel,” “perpendicular,” and “equal” include the described situation and situations that are similar to the described situation, within an acceptable range of deviation, which is determined by those skilled in the art taking into account the measurement under discussion and the error 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, where an acceptable range of deviation for approximate parallelism may be, for example, within 5°; “perpendicular” includes absolute perpendicularity and approximate perpendicularity, where an acceptable range of deviation for approximate perpendicularity may also be, for example, within 5°; “equal” includes absolute equality and approximate equality, where an acceptable range of deviation for approximate equality may be, for example, a difference between the two equals being less than or equal to 5% of either one.

[0076] In recent years, with the development of technologies such as virtual reality, augmented reality, and extended reality, near-eye display devices (also known as head-mounted displays) can image small, near-field images into magnified virtual images in front of the user's field of vision. They can also overlay virtual images onto real physical scene information in real time. Due to their features such as virtual-real fusion, 3D immersion, and hands-free real-time interaction, they have been widely used in various fields, including military, gaming, film and entertainment, live streaming, real estate, retail, education, and healthcare.

[0077] It should be noted that in near-eye display devices, the cone-shaped range of the virtual image that the human eye can observe is called the field of view. The farthest distance between the human eye and the display device when the virtual image can be fully observed is called the exit pupil distance. The range of eye movement that the human eye can make while fully observing 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 a suitable exit pupil distance and eye movement range is the main problem faced in the design of near-eye display devices.

[0078] In related technologies, some near-eye display devices have poor field of view due to unreasonable structural design, such as using a single waveguide design, when designing the coupling structure and waveguide structure of the display source image. As a result, the virtual image can only be emitted from the coupling unit in a limited space and enter the human eye.

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

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

[0081] See Figure 1 The diagram shows a partial cross-sectional structural schematic of a near-eye display device according to an embodiment of the present disclosure.

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

[0083] A double-sided display panel 1 has a first light-emitting side and a second light-emitting side disposed opposite to each other; 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 unit 4 is disposed 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 unit 7 is disposed inside the second optical waveguide 6. Specifically, a first light ray 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 a first observation point D1 through the first coupling unit 4; a second light ray 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 a second observation point D2 through the second coupling unit 7.

[0084] Therefore, in the near-eye display device of this embodiment, the display image of the double-sided display panel 1 can be coupled into the first optical waveguide 3 from the first light-emitting side, and coupled out to the first observation point D1 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-emitting side, and coupled out to the second observation point D2 based on the second coupling unit 7. Thus, by providing multiple coupling reflective surfaces for the display image of the double-sided display panel 1 through multiple coupling units, the exit pupil distance is extended, thereby increasing the field of view of the near-eye display device; at the same time, by placing the double-sided display panel 1, the first coupling grating 2, and the second coupling grating 5 between the first optical waveguide 3 and the second optical waveguide 6, and placing the two coupling units inside the optical waveguide, the structure of the near-eye display device is more compact, realizing product miniaturization.

[0085] For example, the double-sided display panel 1 can be a transparent micro-display source, which can be a liquid crystal display (LCD) source, an organic light-emitting diode (OLED) display source, an active matrix quantum dot light-emitting diode (QLED) display source, a light-emitting diode (LED) display source, a liquid crystal on silicon (LCOS) display source, etc., and the micro-display source has the function of transparent double-sided display.

[0086] For example, the first coupling grating 2 and the second coupling grating 5 can be surface relief gratings, volume holographic gratings, or electrically controlled gratings. The electrically controlled grating can be a liquid crystal grating or a polymer-dispersed liquid crystal (PDLC) grating. The liquid crystal grating can be a PB (Pancharatnam-Berry, geometric) phase liquid crystal grating. The PB phase liquid crystal grating has a wide response bandwidth and unique polarization sensitivity, making it suitable for wide-viewing-angle displays in the near-eye display devices of this disclosure. Furthermore, the polarization characteristics of the PB phase liquid crystal grating are also beneficial for the design of the optical waveguide structure in this disclosure, such as the design of parameters like the position and size of the optical waveguide structure.

[0087] For example, the first optical waveguide 3 is used for total internal reflection to transmit the first light ray, and the second optical waveguide 6 is used for total internal reflection to transmit the second light ray. The first optical waveguide 3 and the second optical waveguide 6 can be planar optical waveguides, specifically made of optical materials with high visible light transmittance (e.g., visible light transmittance ≥ 92%) such as glass and acrylic sheets.

[0088] For example, the first coupling unit 4 and the second coupling unit 7 can be coupling gratings. The coupling gratings have total internal reflection function. Specifically, they can be any one of the following gratings or a combination of several gratings: surface relief grating, volume holographic grating, controllable nano grating (e.g., liquid crystal grating, polymer dispersed liquid crystal (PDLC) grating). The specific selection can be determined according to the actual situation, and this disclosure does not limit this.

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

[0090] See Figure 2 The diagram shows a three-dimensional structural schematic of the double-sided display panel 1, the first coupling grating 2, and the second coupling grating 5 according to an 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), which are arranged in an array along the pixel row direction and the 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 is understood that the first display area 11 and the second display area 12 can display different images, or display the same image, or jointly display a part of the same image (for example, the image consists of image A and image B, the first display area 11 displays image A, and the second display area 12 displays image 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 region 21 and a second grating region 22 arranged along a second direction. The first grating region 21 and the second grating region 22 are independently controlled. The second coupling grating 5 includes a third grating region 51 and a fourth grating region 52 arranged along a third direction. The third grating region 51 and the fourth grating region 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 independent control of the first grating region 21 and the second grating region 22 can be achieved by connecting the first grating region 21 to a first control terminal, such as a first voltage control terminal, and connecting the second grating region 22 to a second control terminal, such as a second voltage control terminal. For example, a signal trace can be extended from the first grating region 21, configured to transmit a first control voltage output from the first voltage control terminal to the first grating region 21; similarly, a signal trace can be extended from the second grating region 22, 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 present different working states, such as a light-blocking state or a light-transmitting state, thereby allowing the first grating area 21 and the second grating area 22 to 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 scenario requirements of the near-eye display device.

[0096] It is understandable that the third grating region 51 and the fourth grating region 52 are different regions of the second coupled grating 5 arranged along the third direction. 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 onto the double-sided display panel 1 respectively 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 onto the double-sided display panel 1 respectively at least partially overlap with the second display area 12.

[0098] The orthographic projection of the first grating area 21 onto the double-sided display panel 1 at least partially overlaps with the first display area 11. This can be achieved by: the orthographic projection of the first grating area 21 onto the first optical waveguide 3 covering the first display area 11; or by: the orthographic projection of the first grating area 21 onto the double-sided display panel 1 substantially overlapping with the first display area 11.

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

[0100] The orthographic projection of the third grating region 51 onto the double-sided display panel 1 at least partially overlaps with the first display region 11. This can be achieved by: the orthographic projection of the third grating region 51 onto the first optical waveguide 3 covering the first display region 11; or by: the orthographic projection of the third grating region 51 onto the double-sided display panel 1 substantially overlapping with the first display region 11.

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

[0102] Therefore, by dividing the double-sided display panel 1 into a first display area 11 and a second display area 12, correspondingly, the first coupling grating 2 is divided into a first grating area 21 and a second grating area 22, and the second coupling grating 5 is divided into a third grating area 51 and a fourth grating area 52, with the aforementioned orthographic projection relationship between the display area and the grating area. Thus, the image from the first display area 11 can be coupled into the first optical waveguide 3 from the first light-emitting side through the first grating area 21; the image from the second display area 12 can be coupled into the second optical waveguide 6 from the first light-emitting side through the second grating area 22; the image from the first display area 11 can be coupled into the second optical waveguide 6 from the second light-emitting side through the third grating area 51; and the image from the second display area 12 can be coupled into the second optical waveguide 6 from the second light-emitting side through the fourth grating area 52. Therefore, by controlling the different operating states of the display area and the grating area, the different display scenario 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 this disclosure, substantially the same area can mean either each accounting for 50%, or the difference in area between the two is within an acceptable deviation range. Here, "substantially" includes the described area and the average value within an acceptable deviation range for that specific area, wherein the acceptable deviation range is determined by those skilled in the art taking into account the measurement under discussion and errors associated with the measurement of that specific quantity (i.e., limitations of the measurement system).

[0105] See Figure 3 The diagram shows a partial planar schematic of a double-sided display panel 1 according to 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 adjacent boundaries of the first projection area and the second projection area coincide, and it is 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 adjacent boundaries of the third projection area and the fourth projection area coincide, and it is located in the third display area 13.

[0107] It is understandable that when the first display area 11 and the second display area 12 display images respectively, a third display area 13 is set and the third display area 13 displays a black screen. In this way, the third display area 13 serves as a border similar to the first display area 11 and the second display area 12, which prevents crosstalk between the images of the first display area 11 and the second display area 12.

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

[0109] For example, the adjacent boundaries of the first projection area and the second projection area coincide, and the third display area 13 can be located such that the adjacent boundaries of the first projection area and the second projection area coincide and overlap with the center line of the third display area 13. Thus, the first raster area 21 covers half of the area of ​​the first display area 11 and the third display area 13, and the second raster area 22 covers the other half of the area of ​​the second display area 12 and the third display area 13.

[0110] For example, the adjacent boundaries of the third projection area and the fourth projection area coincide, and the location of the third display area 13 can be 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 raster area 51 covers half of the area of ​​the first display area 11 and the third display area 13, and the fourth raster area 52 covers the other half of the area of ​​the second display area 12 and the third display area 13.

[0111] In some embodiments, along the first direction, the ratio between the width of the third display area 13 and the width of the first display area 11 or the second display area 12 ranges from 0.1 to 0.2, for example, it can be 0.1, 0.15, 0.18, or 0.2. It is understood that the third display area 13 can be set to be relatively small so that when the first display area 11 and the second display area 12 display images respectively, the display effect of the first display area 11 and the second display area 12 is not affected.

[0112] See Figure 4 This shows another structural schematic diagram of a near-eye display device according to 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 assembly; there is a gap region between the first optical waveguide 3 and the second optical waveguide 6, the gap region including a first sub-region 31 and a second sub-region 32, the first sub-region 31 is provided with the inter-waveguide assembly, and the second sub-region 32 is a gap region; at least one side of the inter-waveguide assembly 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 assembly 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-region 32.

[0114] Therefore, by aligning at least one side of the waveguide assembly with at least one side of the first optical waveguide 3 and at least one side of the second optical waveguide 6 respectively, the light emitted from the double-sided display panel 1 can be completely coupled into the optical waveguide, 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, aligning at least one side of the waveguide assembly with at least one side of the first optical waveguide 3 and at least one side of the second optical waveguide 6 respectively allows the optical waveguide to be fully utilized, avoiding structural waste.

[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 inclined toward the double-sided display panel 1. Thus, the second coupling unit 7 can couple the second light rays coupled into the second optical waveguide 6 to the first observation point D1, and the first coupling unit 4 can couple the first light rays 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 coupling unit 8 and a fourth coupling unit 9. The third coupling unit 8 is located inside the first optical waveguide 3 and is closer to the double-sided display panel 1 than the first coupling unit 4, and the third coupling unit 8 is inclined toward the display panel; the fourth coupling unit 9 is located inside the second optical waveguide 6 and is farther away from the double-sided display panel 1 than the second coupling unit 7, and the fourth coupling unit 9 is inclined toward the display panel.

[0117] In some scenarios, the third coupling unit 8 can couple the first light ray coupled into the first optical waveguide 3 to the first observation point D1, and the first coupling unit 4 can couple the first light ray coupled into the first optical waveguide 3 to the second observation point D2. In other scenarios, the second coupling unit 7 can couple the second light ray coupled into the second optical waveguide 6 to the first observation point D1, and the fourth coupling unit 9 can couple the second light ray coupled into the second optical waveguide 6 to the second observation point D2. This allows for the fulfillment of different display requirements for near-eye display devices.

[0118] See Figure 5 The flowchart illustrates 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 this disclosure provides a control method for a near-eye display device, applied to any of the near-eye display devices described in the first aspect. The method can be executed on a controller disposed in the near-eye device, and the method includes:

[0120] Step S10. Control the working state of the first coupling grating and the second coupling grating, the working state including: light-transmitting state and light-blocking state;

[0121] For example, by applying different voltages to the first coupling grating and the second coupling grating, the first coupling grating can be made to operate in a light-transmitting state or a light-blocking state, and the second coupling grating can be made to operate in a light-transmitting state or a light-blocking state.

[0122] Step S20. Control the display screen of the double-sided display panel 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 coupled out to the first observation point through the first coupling 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 grating and coupled out to the second observation point through the second coupling unit.

[0123] Therefore, the control method for the near-eye display device provided in this embodiment of the present disclosure, by controlling 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, can meet the different display needs of the near-eye display device and improve the user experience when the double-sided display panel, the first coupling grating, and the second coupling grating are in different states.

[0124] See Figure 6 A schematic diagram of a first operating state of the near-eye display device according to an embodiment of the present disclosure is shown; see also Figure 7 The diagram shows a second operating state of the near-eye display device according to an embodiment of the present disclosure.

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

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

[0127] Step S12B. Control the first coupling grating to be in the light-transmitting state during the second time period, and control the second coupling grating to be in the light-blocking state during the second time period;

[0128] The control of the display screen on the dual-sided display panel includes:

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

[0131] It is understandable that when the first and second display areas display the same image, the third display area can also display the same image as the first and second display areas.

[0132] Understandably, during the first time period, the second ray is coupled into the second optical waveguide from the second coupling grating, undergoes total internal reflection in the second optical waveguide, and is then coupled out by the second coupling unit to the first observation point, such as the observation point where the left eye is located. During the second time period, the first ray is coupled into the first optical waveguide from the first coupling grating, undergoes reflection in the first optical waveguide, and is then coupled out by the first coupling unit to the second observation point, such as the observation point where the left eye is located.

[0133] Therefore, both the left and right eyes can receive large images from the dual-sided display panels, such as images from the first and second display areas, or images from the first, second, and third display areas. This increases the size of the received image, allowing the brain to integrate the information from both eyes to obtain a complete virtual image with depth, thus improving the field of view.

[0134] See Figure 8 The diagram illustrates a third operating state of the near-eye display device according to 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, and the second coupling grating includes a third grating region and a fourth grating region arranged along a third direction. Controlling the operating states of the first coupling grating and the second coupling grating includes:

[0136] Step S10A. Control the first grating area and the fourth grating area to be in the light-blocking state, and the second grating area and the third grating area to be in the light-transmitting state;

[0137] The dual-sided display panel includes a first display area and a second display area arranged along a first direction. Controlling the display of the image on the dual-sided display panel includes:

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

[0139] It is understandable that while the first and second display areas are displaying images respectively, the third display area always displays a black screen to prevent the first and second images from interfering with each other.

[0140] Understandably, when the first and fourth grating regions are in a light-blocking state, the first image in the first display area cannot enter the first optical waveguide from the first light-emitting side, and the second image in the second display area cannot enter the second optical waveguide from the second light-emitting side. At this time, the first light ray is coupled into the first optical waveguide from the second grating region, undergoes total internal reflection in the first optical waveguide, and is then coupled out by the first coupling unit to the second observation point, such as the observation point where the right eye is located. Additionally, the second light ray is coupled into the second optical waveguide from the third grating region, undergoes total internal reflection in the second optical waveguide, and is then coupled out by the second coupling unit to the first observation point, such as the observation point where the left eye is located.

[0141] It is understandable that the first and second images can be images of the same target object from different angles, such as images simulating observation by the left eye and images simulating observation by the right eye. Then, by transmitting images taken from different angles to the left and right eyes respectively, the human eye can process the images based on the visual delay effect after receiving different images, and 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 and right eyes can receive display images from different angles at the same time, the double-sided display panel can use a low refresh rate, thereby reducing the refresh rate requirement for the double-sided display panel.

[0143] See Figure 9 A schematic diagram of a fourth operating state of the near-eye display device according to an embodiment of the present disclosure is shown; see also Figure 10 This diagram illustrates a fifth operating state of the near-eye display device according to an embodiment of the present disclosure.

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

[0145] Step S11 C. Control the first grating area and the second grating area to be in the light-blocking state in the 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 diffraction angles of the third grating area and the fourth grating area to the second light are different;

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

[0147] It is understandable that by applying different voltages to the third and fourth grating regions, the diffraction angles of the third and fourth grating regions with respect to the second light rays can be made different; similarly, by applying different voltages to the first and second grating regions, the diffraction angles of the first and second grating regions with respect to the second light rays can be made different.

[0148] The diffraction angle of a grating region refers to the angle of light rays relative to the plane of the grating when the light rays exit the grating region. For example, the diffraction angles corresponding to the first and third grating regions are α, and the diffraction angles corresponding to the second and fourth grating regions are β. When the diffraction angle is α, the first light ray, after entering the first optical waveguide, is not reflected at the third coupling unit and can be transmitted through total internal reflection to the first coupling unit; when the diffraction angle is β, the first light ray undergoes total internal reflection at the third coupling unit and is coupled out. Similarly, when the diffraction angle is α, the second light ray, after entering the second optical waveguide, is not reflected at the second coupling unit and can be transmitted through total internal reflection to the fourth coupling unit; when the diffraction angle is β, the second light ray undergoes total internal reflection at the second coupling unit and is coupled out.

[0149] In some embodiments, the dual-sided display panel includes a first display area and a second display area arranged along a first direction, and controlling the display of an image on the dual-sided display panel includes:

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

[0151] For example: During the first time period, the first display area is controlled to display the first image of the first frame, and the second display area is controlled to display the second image of the first frame. During the first time period, the second light ray from the first display area is coupled into the second optical waveguide from the third grating area at a diffraction angle α, and then transmitted through total internal reflection within the second optical waveguide to the second output unit, from which it is coupled out to the second observation point; the second light ray from the second display area is coupled into the second optical waveguide from the fourth grating area at a diffraction angle β, and then transmitted through total internal reflection within the second optical waveguide to the fourth output unit, from which it is coupled out to the first observation point.

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

[0153] Therefore, the left and right eyes can simultaneously receive virtual images from different perspectives. The human brain then integrates the information received by the left and right eyes and stitches them together to obtain the complete virtual image, thus achieving a wide viewing angle. In addition, the dual-sided display panel can use a high refresh rate, and based on different waveguides, virtual images of different depths can be transmitted. Based on the visual delay effect of the human eye, a complete virtual image with depth and multiple layers can be obtained.

[0154] See Figure 11 A schematic diagram of a sixth operating state of the near-eye display device according to an embodiment of the present disclosure is shown; see also Figure 12 This diagram illustrates a seventh operating state of the near-eye display device according to an embodiment of the present disclosure.

[0155] Combination Figure 11 and Figure 12 The first coupling grating includes a first grating region and a second grating region arranged along a second direction, and the second coupling grating includes a third grating region and a fourth grating region arranged along a third direction. Controlling the operating 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-blocking state during the first time period, and the first grating area and the fourth grating area to be in the light-transmitting state during 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-blocking state during the second time period, and the second grating area and the third grating area to be in the light-transmitting state during 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 dual-sided display panel includes a first display area and a second display area arranged along a first direction, and controlling the display of an image on the dual-sided display panel includes:

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

[0160] For example: During the first time period, the first display area is controlled to display the first image of the first frame, and the second display area is controlled to display the second image of the first frame. During the first time period, the first light ray from the first display area is coupled into the first optical waveguide from the first grating area at a diffraction angle α, and is transmitted through total internal reflection within the first optical waveguide to the first output unit, from which it is coupled out to the second observation point; the second light ray from the second display area is coupled into the second optical waveguide from the fourth grating area at a diffraction angle β, and is transmitted through total internal reflection within the second optical waveguide to the fourth output unit, from which it is coupled out to the first observation point.

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

[0162] Therefore, the left and right eyes can simultaneously receive virtual images from different perspectives. The human brain then integrates the information received by the left and right eyes and stitches them together to obtain the complete virtual image, thus achieving a wide viewing angle. In addition, the dual-sided display panel can use a high refresh rate, and based on different waveguides, virtual images of different depths can be transmitted. Based on the visual delay effect of the human eye, a complete virtual image with depth and multiple layers can be obtained.

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

[0164] like Figure 13 As shown, a third aspect of this disclosure provides a control device 200 for a near-eye display device, disposed in any of the near-eye display devices described in the first aspect, the control device 200 comprising:

[0165] The first control unit 201 is used to control the working state of the first coupling grating and the second coupling grating, the working state including: light-transmitting state and light-blocking state;

[0166] The second control unit 202 is used to control the display screen of the double-sided display panel 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 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 coupled out to the second observation point through the second coupling unit.

[0167] Therefore, the control device for the near-eye display device provided in this embodiment 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, the different display needs of the near-eye display device can be met, thereby improving the user experience.

[0168] A third aspect of this disclosure provides a computer-readable storage medium storing at least one computer program instruction, which is loaded and executed by a processor to perform the operations as described in any of the methods in the second aspect.

[0169] Computer-readable storage media may be portable compact disc read-only memory (CD-ROM) and include program code, and may run on a terminal device, such as a personal computer. However, the computer-readable storage media of this disclosure are not limited thereto. In this disclosure, a readable storage medium may be any tangible medium that contains or stores a program that may be used by or in connection with an instruction execution system, apparatus, or device.

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

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

[0172] The above description does not provide detailed technical specifications regarding the layout of each layer of the product. However, those skilled in the art should understand that layers and areas of the desired shape can be formed using various technical means. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination.

[0173] Furthermore, those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this disclosure is limited to these examples; within the framework of this disclosure, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this disclosure as described above, which are not provided in detail for the sake of brevity.

[0174] Although preferred embodiments of this disclosure have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this 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 is stacked on the first light-emitting side of the double-sided display panel; A first optical waveguide is stacked and disposed on the side of the first coupling grating away from the double-sided display panel; The first coupling unit is disposed inside the first optical waveguide; A second coupling grating is stacked on the second light-emitting side of the double-sided display panel; The second optical waveguide is stacked and disposed on the side of the second coupling grating away from the double-sided display panel; The second coupling unit is disposed inside the second optical waveguide; The first light emitted from the first light-emitting side of the dual-sided display panel is coupled into the first optical waveguide through the first coupling grating, and coupled out to the first observation point through the first coupling unit; The second light ray 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 coupled out to the second observation point through the second coupling unit; The double-sided display panel includes a first display area and a second display area arranged along a first direction; The first coupling grating includes a first grating region and a second grating region arranged along a second direction, the first grating region and the second grating region being controlled independently of each other. The second coupling grating includes a third grating region and a fourth grating region arranged along a third direction, the third grating region and the fourth grating region being controlled independently of each other. The first direction, the second direction and the third direction are parallel to each other. The first grating area and the third grating area are projected onto the double-sided display panel in a way that at least partially overlaps with the first display area. The orthographic projections of the second grating area and the fourth grating area onto the double-sided display panel respectively overlap at least partially with the second display area.

2. The near-eye display device according to claim 1, characterized in that, The first coupling grating and the second coupling grating are electrically controlled gratings.

3. The near-eye display device according to claim 1, characterized in that, The orthographic projections of the first grating area and the third grating area onto the double-sided display panel respectively cover the first display area; The second grating area and the fourth grating area are projected onto the double-sided display panel and respectively cover the second display area.

4. The near-eye display device according to claim 1, 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; 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 1-4, characterized in that, The dual-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, and the second grating region has a second projection area on the first optical waveguide. The adjacent boundaries of the first projection area and the second projection area coincide and are located in the third display area. The third grating region has a third projection area on the first optical waveguide, and the fourth grating region has a fourth projection area on the first optical waveguide. The adjacent boundaries of the third projection area and the fourth projection area coincide 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, the ratio between the width of the third display area and the width of the first display area or the second display area ranges from 0.1 to 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 assembly; There is a gap region between the first optical waveguide and the second optical waveguide. The gap region includes a first sub-region and a second sub-region. The first sub-region is provided with the waveguide component, and the second sub-region is a gap region. At least one side of the waveguide assembly is flush with at least one side of the first optical waveguide and at least one side of the second optical waveguide, respectively.

8. The near-eye display device according to claim 1, characterized in that, The second coupling unit is closer to the dual-sided display panel than the first coupling unit, and the first coupling unit and the second coupling unit are inclined toward the dual-sided display panel.

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

10. A control method for a near-eye display device, characterized in that, Applied to any one of the near-eye display devices as described in claims 1-9, the method comprises: The operating states of the first coupling grating and the second coupling grating are controlled, and the operating states include: a light-transmitting state and a light-blocking state; The display screen of the dual-sided display panel is controlled so that the first light emitted from the first light-emitting side of the dual-sided display panel is coupled into the first optical waveguide through the first coupling grating and coupled out to the first observation point through the first coupling unit; the second light emitted from the second light-emitting side of the dual-sided display panel is coupled into the second optical waveguide through the second coupling grating and coupled out to the second observation point through the second coupling unit.

11. The method according to claim 10, characterized in that, The control of the operating states of the first coupling grating and the second coupling grating includes: The first coupling grating is controlled to be in the light-blocking state during a first time period, and the second coupling grating is controlled to be in the light-transmitting state during the first time period; The first coupling grating is controlled to be in the light-transmitting state during the second time period, and the second coupling grating is controlled to be in the light-blocking state during the second time period; The control of the display screen on the dual-sided display panel includes: The dual-sided display panel is controlled to display a first frame during the first time period, so that the second light emitted from the second light-emitting side during the first time period is coupled into the second optical waveguide through the second coupling grating; The dual-sided display panel is controlled to display a second frame during the second time period, so that the first light emitted from the first light-emitting side during 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, and the second coupling grating includes a third grating region and a fourth grating region arranged along a third direction. Controlling the operating states of the first coupling grating and the second coupling grating includes: The first grating area and the fourth grating area are controlled to be in the light-blocking state, and the second grating area and the third grating area 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, and the second coupling grating includes a third grating region and a fourth grating region arranged along a third direction. Controlling the operating states of the first coupling grating and the second coupling grating includes: The first grating region and the second grating region are controlled to be in the light-blocking state during the first time period, and the third grating region and the fourth grating region are in the light-transmitting state during the first time period, and the diffraction angles of the third grating region and the fourth grating region for the second light are different; The third grating region and the fourth grating region are controlled to be in the light-blocking state during the second time period, while the first grating region and the second grating region are in the light-transmitting state during the second time period, and the first grating region and the second grating region 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, and the second coupling grating includes a third grating region and a fourth grating region arranged along a third direction. Controlling the operating states of the first coupling grating and the second coupling grating includes: The second grating region and the third grating region are controlled to be in the light-blocking state during the first time period, and the first grating region and the fourth grating region are in the light-transmitting state during the first time period, and the diffraction angle of the first grating region to the first light is different from the diffraction angle of the fourth grating region to the second light. The first grating region and the fourth grating region are controlled to be in the light-blocking state during the second time period, and the second grating region and the third grating region are in the light-transmitting state during the second time period. The diffraction angle of the second grating region to the first light is different from that of the third grating region to the second light.

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

Images