Display apparatus, cabin, and vehicle

Abstract

The present application provides a display apparatus, a cabin, and a vehicle. The display apparatus comprises a housing, an image generation element, an image magnification element, a window element, and a viewing angle compensation film. The image generation element is used for projecting an image beam. After being sequentially reflected by the window element and the image magnification element, the image beam can be emitted out of the window element to form a display beam. The display beam is used for forming a virtual image. The viewing angle compensation film is located on a propagation path of the image beam. The display beam has a first light-emitting brightness at an edge of the window element and a second light-emitting brightness at the center of the window element, and the ratio of the first light-emitting brightness to the second light-emitting brightness is within a first preset range. By means of the design of the viewing angle compensation film, the present application improves the edge brightness of a displayed image of the display apparatus, and increases the uniformity of the black field brightness of the entire displayed image, thereby enhancing visual immersion and helping to improve the use experience.

Description

Display devices, cockpit, and vehicles Technical Field

[0001] This application relates to the field of vehicle technology, specifically to a display device, a cockpit, and a vehicle. Background Technology

[0002] With the development of vehicle technology, more and more intelligent optical display products are being installed in vehicles. By using birdbath optical architecture or pancake optical architecture, the image source is magnified and projected at a distance to achieve large-format, long-distance display.

[0003] However, the current display effects of smart light display products are poor, resulting in an unsatisfactory user experience. Summary of the Invention

[0004] This application provides a display device, a cockpit, and a vehicle. The display device includes a housing, an image generating element, an image magnifying element, a viewing window element, and a viewing angle compensation film. The projection angle of the image beam projected by the image generating element is less than or equal to a first preset value. Through the design of the viewing angle compensation film, the edge brightness of the displayed screen is improved, and the uniformity of black field brightness of the entire displayed screen is increased, thereby improving the visual immersion and enhancing the user experience.

[0005] In a first aspect, this application provides a display device. The display device includes a housing, an image generating element, an image magnifying element, a viewing window element, and a viewing angle compensation film; the housing has a receiving space and a mounting port communicating with the receiving space, the image generating element and the image magnifying element are both located in the receiving space and mounted on the housing, and the viewing window element is mounted on the mounting port; the image generating element is used to project an image beam, the image beam can be reflected sequentially by the viewing window element and the image magnifying element, and then emitted by the viewing window element to form a display beam, the display beam is used to form a virtual image; the projection angle of the image beam is less than or equal to a first preset value, the viewing angle compensation film is located on the propagation path of the image beam, the display beam has a first emission brightness at the edge of the viewing window element, the display beam has a second emission brightness at the center of the viewing window element, and the ratio of the first emission brightness to the second emission brightness is within a first preset range.

[0006] In this application, the design of the window element and the image magnifying element allows the image beam to be emitted after two reflections to form a display beam, thereby increasing the optical path of the image beam and thus increasing the distance of the virtual image formed by the display beam, enabling the formation of a large-format virtual image at a distance. By installing the image generating element and the image magnifying element within the housing space, the outer casing can enclose and protect the image generating element and the image magnifying element.

[0007] In this application, the projection angle of the image beam is less than or equal to a first preset value so that the projection angle of the image beam is not too large, thereby avoiding excessive projection of the image beam onto the inner wall of the housing, thereby reducing or even avoiding stray light that interferes with imaging by reflection on the inner wall of the housing, which is beneficial to improving the imaging quality of the display device.

[0008] In this application, by designing a viewing angle compensation film, phase compensation can be performed on the image beam along its propagation path. This ensures that the phase of the image beam emitted at an angle to the light-emitting surface is consistent with the phase of the image beam emitted from the center of the light-emitting surface. Consequently, the phase of the display beam emitted through the window element becomes consistent across all points, leading to a consistency between the first and second emitted light brightness. Specifically, the ratio of the first to the second emitted light brightness is within a first preset range. This design results in highly uniform brightness across the virtual image formed by the display device, avoiding the whitening phenomenon at the four corners of the virtual image. It also allows the background of the virtual image to present a sense of black, providing the user with an immersive viewing experience and improving the overall user experience.

[0009] In some possible implementations, the first preset range is 1 to 1.2.

[0010] In this implementation, the first preset range satisfies the above design, which can achieve a high consistency between the first emitted light brightness and the second emitted light brightness, effectively avoid the phenomenon of whitening at the four corners of the virtual image, and make the display background of the virtual image present a black field to the user, thereby bringing an immersive viewing experience and improving the user experience.

[0011] In some possible implementations, a viewing angle compensation film is bonded to the image generating element so that the image beam emitted from the image generating element has undergone phase compensation. The brightness of the image beam emitted from the edge of the image generating element is highly consistent with the brightness of the image beam emitted from the center of the image generating element. This allows the image beam to be reflected by the window element and the image magnification element in sequence, resulting in a display beam with high consistency between the peripheral brightness and the central brightness emitted from the window element. This, in turn, enables the virtual image formed by the display device to avoid the phenomenon of whitening at the four corners and improves the image quality.

[0012] In other possible implementations, a viewing angle compensation film is bonded to the window element so that the phase of the image beam can be compensated at the window element between the image beam exiting through the window element and forming the display beam. This makes the brightness of the display beam at the edge of the window element more consistent with the brightness of the display beam at the center of the window element, resulting in a highly uniform brightness of the virtual image formed by the display device. This avoids the phenomenon of whitening at the four corners of the virtual image, allowing the display background of the virtual image to present a black field feeling to the user, thereby bringing an immersive viewing experience and improving the user experience.

[0013] In some possible implementations, the viewing angle compensation film is adhered to the surface of the viewing element facing the housing space. Because the viewing angle compensation film is located within the housing space, the viewing element can protect the film, thereby enabling the viewing angle compensation film to both improve image quality and protect the film.

[0014] In other possible implementations, the viewing angle compensation film is bonded to the surface of the window element facing away from the receiving space. This design allows the viewing angle compensation film to achieve phase compensation of the light beam when the display device finally emits light, which helps to improve the phase compensation accuracy and thus improve the image quality.

[0015] In some other possible implementations, the viewing element comprises a first part and a second part, with the viewing angle compensation film bonded to both the first and second parts of the viewing element. This design not only protects the viewing angle compensation film using the viewing element but also enhances image quality using the film.

[0016] In some possible implementations, the image generating element includes a light source and a light-transmitting panel stacked together; the viewing angle compensation film is adhered to the surface of the light-transmitting panel facing away from the light source, or to the surface of the light-transmitting panel facing the light source.

[0017] In some possible implementations, the first preset value includes a first value and a second value, where the first value is 50° and the second value is 30°, and the first value and the second value correspond to the maximum values ​​of the projection angles of the image beam in different directions.

[0018] In this implementation, the first and second values ​​are adaptively designed based on the different risks of stray light being generated when the image beam is projected onto the inner wall of the housing in the first and second directions, so as to reduce the risk of stray light and improve the uniformity of imaging.

[0019] The first value can be 50°. In this case, the projection angle of the image generating element in the first direction is less than or equal to 50°. This design allows the image beam projected by the image generating element to better cover the window element in the first direction, achieving better imaging uniformity. In addition, the image beam will not be projected excessively onto the inner wall of the housing in the first direction, thereby reducing the risk of stray light being formed by reflection on the inner wall of the housing.

[0020] The second value can be 30°. In this case, the projection angle of the image generating element in the second direction is less than or equal to 30°. This design allows the image beam projected by the image generating element to better cover the window element in the second direction, achieving better imaging uniformity. In addition, the image beam will not be projected excessively onto the inner wall of the housing in the second direction, thereby reducing the risk of stray light being formed by reflection on the inner wall of the housing.

[0021] In some possible implementations, the image generating element has a light-emitting surface, which includes a first long side, a first short side, a second long side, and a second short side connected end to end in sequence. The first long side and the second long side are arranged opposite each other, and the first short side and the second short side are arranged opposite each other. The image generating element has a first projection field of view in a first direction and a second projection field of view in a second direction. The first direction is parallel to the first short side and points to the second short side, and the second direction is parallel to the first long side and points to the second long side. The angle between the edge of the first projection field of view and the normal of the light-emitting surface is less than or equal to a first value, and the angle between the edge of the second projection field of view and the normal of the light-emitting surface is less than or equal to a second value.

[0022] In this implementation, the long and short sides of the light-emitting surface are designed as described above so that the virtual image formed by the display device is horizontal, conforming to the user's viewing habits. Since the first direction is perpendicular to the arrangement plane, when the image beam is projected onto the inner wall of the housing in the first direction, the probability of the reflected light being reflected onto the viewing element or image magnification element is low, thus minimizing the risk of image interference. Since the second direction is parallel to the arrangement plane, when the image beam is projected onto the inner wall of the housing in the second direction, the probability of the reflected light being reflected onto the viewing element or image magnification element is high, thus increasing the risk of image interference. Therefore, the first value can be designed to be larger than the second value without increasing the risk of stray light interfering with image formation.

[0023] The plane formed by connecting the center of the image generating element, the center of the window element, and the center of the image magnifying element can be regarded as the arrangement plane. The image generating element, the window element, and the image magnifying element are arranged according to the arrangement plane, with the first direction perpendicular to the arrangement plane and the second direction parallel to the arrangement plane.

[0024] In some possible implementations, the image beam covers the window element; in other words, the projection angle of the image beam projected by the image generating element is greater than the coupling angle between the image generating element and the window element, so that the brightness uniformity of the virtual image finally formed by the display device is high.

[0025] In the first direction, the maximum angle between the beam of light projected by the image generating element onto the window element and the normal of the light-emitting surface is in the range of 20° to 28°. This design enables the image beam projected by the image generating element to better cover the window element in the first direction, achieving better imaging uniformity.

[0026] In the second direction, the maximum angle between the beam of light projected by the image generating element onto the window element and the normal of the light-emitting surface is in the range of 11° to 13°. This design allows the image beam projected by the image generating element to better cover the window element in the second direction, achieving better imaging uniformity.

[0027] In some possible implementations, the image beam projected through the center of the light-emitting surface has a first brightness; within the first projection field of view, the image beam forming a 30° angle with the normal of the light-emitting surface has a second brightness, and the ratio of the second brightness to the first brightness is greater than or equal to 50%.

[0028] In this implementation, the image beam projected by the image generating element, according to the above design, can make the brightness of the image beam received by the edge region of the window element in the first direction higher. This is beneficial to achieving high uniformity of the image beam projected by the image generating element to the window element in the first direction, thereby facilitating high brightness uniformity of the virtual image formed by the display device in the first direction.

[0029] In some possible implementations, within the second projection field of view, the image beam forming a 15° angle with the normal to the light-emitting surface has a third brightness, the ratio of the third brightness to the first brightness being greater than or equal to 50%.

[0030] In this implementation, the image beam projected by the image generating element, according to the above design, can make the brightness of the image beam received by the edge region of the window element in the second direction higher. This is beneficial to achieving high uniformity of the image beam projected by the image generating element to the window element in the second direction, thereby facilitating high brightness uniformity of the virtual image formed by the display device in the second direction.

[0031] In this implementation, when the image beam projected by the image generating element is designed according to the above embodiment in both the first and second directions, the edge areas around the window element can receive the image beam with higher brightness. This makes the overall uniformity of the image beam projected by the image generating element onto the window element higher, which is beneficial to achieving high overall brightness uniformity of the virtual image formed by the display device.

[0032] In some possible implementations, within the first projection field of view, the image beam at a 50° angle to the normal of the emitting surface has a fourth brightness, the ratio of the fourth brightness to the first brightness being less than or equal to 10%.

[0033] In this implementation, the image beam projected by the image generating element is designed in such a way that the edge region of the image beam projected by the image generating element has a lower brightness in the first direction. This results in a lower brightness of the image beam incident on the inner wall of the housing in the first direction. After being reflected by the inner wall of the housing, its brightness will decrease rapidly and further reduce, which helps to reduce the risk of stray light that interferes with imaging due to reflection on the inner wall of the housing.

[0034] In some possible implementations, within the second projection field of view, the image beam forming a 30° angle with the normal to the light-emitting surface has a fifth brightness, the ratio of the fifth brightness to the first brightness being less than or equal to 10%.

[0035] In this implementation, the image beam projected by the image generating element is designed in such a way that the edge region of the image beam projected by the image generating element has a lower brightness in the second direction. This results in a lower brightness of the image beam incident on the inner wall of the housing in the second direction. After being reflected by the inner wall of the housing, its brightness will decrease rapidly and further reduce, which helps to reduce the risk of stray light that may interfere with imaging due to reflection on the inner wall of the housing.

[0036] In this implementation, the image beam projected by the image generating element follows the aforementioned fourth and fifth brightness designs in both the first and second directions. This results in low brightness of the image beam at large angles, and rapid attenuation after reflection on the inner wall of the casing. After multiple reflections on the inner wall of the casing, the proportion of light reflected from the casing entering the human eye is greatly reduced (e.g., the stray light ratio can be less than 1 / 1000), achieving zero stray light sensing within the cavity. In other words, the brightness / intensity of stray light is far lower than the brightness / intensity of the virtual image formed by the display device, so that the human eye is essentially unaware of stray light.

[0037] In some possible implementations, the brightness uniformity of the display beam on the window element is greater than or equal to 80%.

[0038] In this implementation, since the display beam is emitted from the viewing element and projected onto the user's eye (which can be considered an eye box), a virtual image can be formed at a distance. Since the user needs to look through the viewing element to see the virtual image, the brightness uniformity of the virtual image is consistent with the brightness uniformity of the display beam on the viewing element. Therefore, the brightness uniformity of the display beam on the viewing element satisfies the above design, enabling the brightness uniformity of the virtual image formed by the display device to be greater than or equal to 80%, resulting in high image quality.

[0039] In some possible implementations, the image generating element includes a light source, a backlight collimator, and a light-transmitting panel stacked sequentially; the backlight collimator is used to collimate the light beam emitted from the light source, and the light-transmitting panel is used to transmit the collimated light beam through the backlight collimator.

[0040] In this implementation, by designing the backlight collimator, the projection angle of the image beam emitted by the image generating element can be reduced so that the projection angle of the image beam can meet the first preset value mentioned above. This prevents the projection angle of the image beam from being too large, avoiding excessive projection of the image beam onto the inner wall of the housing. This reduces or even avoids stray light that reflects off the inner wall of the housing and interferes with imaging, which is beneficial to improving the imaging quality of the display device.

[0041] In some possible implementations, the light source includes a light strip and a light guide plate, with the light guide plate and the backlight collimator stacked together, and the light strip disposed at the end of the light guide plate.

[0042] In this implementation, the combination of the light strip and the light guide plate constitutes a side-lit backlight structure. Due to the presence of the light guide plate, the side-lit backlight structure enables the light source to emit light more uniformly, thereby improving the uniformity of light emission.

[0043] In other possible implementations, the light source includes an array of multiple LEDs stacked together with a backlight collimator.

[0044] In this implementation, the multiple LEDs arranged in an array can be designed as a direct-lit backlight structure. Since the direct-lit backlight structure can emit light directly towards the light-transmitting panel through multiple LEDs, the light source brightness is higher, which is beneficial to improving the light output brightness of the image generating element, thereby improving the light output brightness of the display device.

[0045] In some possible implementations, the backlight collimator includes a first prism and a second prism stacked together, with the first prism closer to the light source than the second prism, or the second prism closer to the light source than the first prism; the first prism is used to collimate the light beam emitted from the light source in a first direction, and the second prism is used to collimate the light beam emitted from the light source in a second direction.

[0046] In this implementation, the first prism can collimate the light beam emitted from the light source in the first direction, thereby reducing the projection angle of the light beam emitted from the light source in the first direction. This allows the projection angle of the image beam emitted from the image generating element in the first direction to be less than or equal to a first value, so that the image beam will not be projected onto the inner wall of the housing in the first direction, thereby reducing the risk of stray light being reflected on the inner wall of the housing.

[0047] In this implementation, the second prism can collimate the light beam emitted from the light source in the second direction, thereby reducing the projection angle of the light beam emitted from the light source in the second direction. This allows the projection angle of the image beam emitted from the image generating element in the second direction to be less than or equal to the second value, so that the image beam will not be projected excessively onto the inner wall of the housing in the second direction, thereby reducing the risk of stray light being reflected on the inner wall of the housing.

[0048] In some possible implementations, the backlight collimator also includes a privacy screen, which is disposed on the side of the first prism facing away from the second prism, or on the side of the second prism facing away from the first prism, or between the first prism and the second prism; the privacy screen includes multiple gratings, which are arranged at intervals parallel to the second direction.

[0049] In this implementation, the privacy film is designed to reduce the projection angle of the light beam emitted from the light source in the second direction, thereby further reducing the projection angle of the image beam in the second direction. This helps to further reduce the probability of the image beam being projected onto the inner wall of the housing in the second direction, thus reducing the risk of stray light being reflected on the inner wall of the housing.

[0050] In some possible implementations, the light source includes multiple LEDs arranged in an array, with the LEDs stacked on top of a backlight collimator; the backlight collimator includes a light-collecting lens and a diffuser film stacked on top of each other, with the light-collecting lens closer to the light source than the diffuser film.

[0051] In this implementation, since the light beam emitted by the LED is a divergent beam, the light beam can be converged first by the light-collecting lens to avoid excessive divergence, and then diffused by the diffuser film. Since the diffuser film has a weaker ability to refract light than the light-collecting lens, the light beam emitted by the LED can be collimated, thus reducing the projection angle of the light beam emitted by the image generating element.

[0052] In some possible implementations, there are multiple light-collecting lenses, and the number of light-collecting lenses is the same as the number of LEDs, with one light-collecting lens corresponding to one LED.

[0053] In this implementation, by setting the light-collecting lens to correspond one-to-one with the lamp beads, it is beneficial to improve the focusing effect of the light-collecting lens on the light beam emitted by the lamp beads, thereby improving the final collimation effect of the light beam emitted by the lamp beads.

[0054] In some possible implementations, the image generating element includes multiple display areas, with LEDs located in different display areas connected in parallel.

[0055] In this implementation, by partitioning the image generation element, the LEDs in different display areas can be controlled independently, thereby achieving local dimming. This allows the brightness of the LEDs in different display areas to be adjusted according to different application scenarios, thus achieving diversified display scenarios.

[0056] In some possible implementations, the image generating element also includes a quantum dot film disposed between the backlight collimator and the light source.

[0057] In this implementation, the LED can excite the QD film, thereby narrowing the RGB three-color light beams, thus improving the display color gamut of the image generating element, and further improving the display color gamut of the display device. For example, the display color gamut value of the display device can be greater than or equal to 85%.

[0058] In some possible implementations, the display brightness of the image generating element is greater than 2000 nits, thereby enabling the output brightness of the display device to be greater than or equal to 500 nits, thus achieving high-brightness imaging and improving the user experience of the display device.

[0059] In some possible implementations, the display resolution of the image generating element is greater than or equal to 400 PPI, thereby enabling the resolution of the virtual image angle formed by the display device to meet 90 PPD, achieving high-definition virtual image display and improving the user experience of the display device.

[0060] In some possible implementations, the color gamut value of the image generating element is greater than or equal to 75%, so that the display device has a good color gamut for the out-of-screen display, thereby making the color saturation of the virtual image formed by the display device high and improving the display quality.

[0061] In some possible implementations, the image generating element includes a base, a light source, and a light-transmitting panel; the base includes a base and a peripheral wall, the peripheral wall being connected to the periphery of the base, and the peripheral wall and the base enclosing an accommodating space; the light source and the light-transmitting panel are stacked, the light source and the light-transmitting panel are fixed to the base and located within the accommodating space, and the periphery of the light-transmitting panel is spaced apart from the peripheral wall; the outer shell has a first mounting wall, the bottom wall abutting against the first mounting wall, and the opening of the accommodating space facing away from the first mounting wall; the display device also includes multiple locking members, all of which are located within the receiving space, the multiple locking members are arranged at intervals along the circumference of the base, one end of the locking member is fixedly connected to the outer shell, and the opposite end of the locking member is connected to the base.

[0062] In this implementation, since the image source body (light source and light-transmitting panel) can be fixed to the base first, and then the base is fixed to the first mounting wall, a fixed installation between the image generating element and the housing can be achieved. This avoids damage to the image source body caused by a fixed connection between the image source body and the housing. For example, it can prevent uneven display brightness or color due to pressure on the image source body during installation. Furthermore, using the image source body as the light source for the display device is beneficial for improving the display effect of the display device, such as increasing color saturation. In addition, the stability of the fixed installation of the image generating element can be improved by multiple locking members arranged at intervals along the circumference of the base.

[0063] In some possible implementations, the opposite end of the locking member extends into the gap between the light-transmitting panel and the peripheral sidewall, and abuts against the peripheral sidewall toward the first mounting wall.

[0064] In this implementation, since the locking member extends to the gap between the image source body and the peripheral sidewall, and the locking member abuts against the peripheral sidewall in the direction of the first mounting wall, it can play a role in preventing detachment, reducing the risk of the image generating element detaching from the locking member, and improving the installation stability of the image generating element.

[0065] In some possible implementations, the housing includes a first mounting wall, a second mounting wall, and a third mounting wall, with the first mounting wall and the second mounting wall arranged opposite to each other, and the third mounting wall and the second mounting wall arranged opposite to each other; an image generating element is mounted on the first mounting wall, the second mounting wall has a mounting opening, a window element is mounted on the second mounting wall and covers the mounting opening, and an image magnifying element is mounted on the third mounting wall.

[0066] In this implementation, due to the structural design of the housing, the window element can be positioned relative to both the image generating element and the image magnifying element. This allows the window element to receive the image beam projected from the image generating element and reflect the image beam to the image magnifying element, and then emit the image beam reflected by the image magnifying element to form a display beam.

[0067] The outer casing can enclose the image generating element, preventing external moisture, dust, and other impurities from corroding it. Specifically, other mounting walls (not limited to second and third mounting walls) are connected to both sides of the first mounting wall, making the first mounting wall the center of a C-shaped shell structure. In this case, the image generating element, mounted on the first mounting wall, can be enclosed by the mounting walls on both sides, thus forming waterproof protection for the image generating element. Furthermore, when the display device is used in a cockpit or vehicle, the light-emitting surface of the image generating element should not face upwards or diagonally upwards. This can prevent moisture and other contaminants from directly penetrating the image generating element, improving the waterproof effect, for example, achieving an IP52 level of waterproofing.

[0068] In some possible implementations, the housing includes a first mounting wall and a second mounting wall, which are arranged opposite to each other; an image generating element is mounted on the first mounting wall, the second mounting wall has a mounting opening, a window element is mounted on the second mounting wall and covers the mounting opening, and an image magnifying element is located between the image generating element and the window element; the image magnifying element is also used to project an image beam toward the window element through the image magnifying element.

[0069] In this implementation, the image beam emitted from the image generating element passes through the image magnifying element, is reflected sequentially by the viewing element and the image magnifying element, and then emitted again through the viewing element. This increases the optical path length of the image beam within the housing, thereby increasing the size and distance of the virtual image. Furthermore, since the image magnifying element is positioned between the viewing element and the image generating element, the overall size of the display device can be further reduced, enabling a miniaturized design of the display device.

[0070] Secondly, this application also provides a cockpit. The cockpit includes any of the display devices described above.

[0071] In this application, the user experience of the display device is improved by designing the display device, thereby improving the user experience of the cockpit.

[0072] Thirdly, this application also provides a means of transportation, which includes a vehicle and any of the aforementioned display devices, the display devices being installed in the vehicle, or includes any of the aforementioned cabins, the cabins being installed in the vehicle.

[0073] In this application, the user experience of the display device is improved by designing the display device, thereby improving the user experience of the vehicle. Attached Figure Description

[0074] Figure 1 is a schematic diagram of the vehicle provided in this application in some embodiments;

[0075] Figure 2 is a schematic diagram of the structure of the display device in the vehicle shown in Figure 1 in some embodiments;

[0076] Figure 3 is a schematic diagram of light emission from the image generating element in the display device shown in Figure 2 in some embodiments;

[0077] Figure 4 is a schematic diagram of the structure of the image generating element in the display device shown in Figure 2 in some embodiments;

[0078] Figure 5A is a schematic diagram of the backlight collimator in some implementations of the image generating element shown in Figure 4.

[0079] Figure 5B is a schematic diagram of the first prism in the backlight collimator shown in Figure 5A collimating the beam in some implementations;

[0080] Figure 5C is a schematic diagram of the second prism in the backlight collimator shown in Figure 5A collimating the beam in some embodiments;

[0081] Figure 6A is a structural schematic diagram of the backlight collimator in the image generating element shown in Figure 4 in some other embodiments;

[0082] Figure 6B is a schematic diagram of the privacy film in some embodiments of the backlight collimator shown in Figure 6A;

[0083] Figure 7 is a schematic diagram of the structure of the light source in the image generating element shown in Figure 4 in some embodiments;

[0084] Figure 8A is a schematic diagram of the structure of the light source in the image generating element shown in Figure 4 in some other embodiments;

[0085] Figure 8B is a schematic diagram of the backlight collimator in the image generating element shown in Figure 8A in some embodiments;

[0086] Figure 9 is a schematic diagram of the structure of the image generating element shown in Figure 8A, in which a quantum dot film is added in some embodiments;

[0087] Figure 10A is a schematic diagram of the structure of the image generating element in the display device shown in Figure 2 in some embodiments;

[0088] Figure 10B is a schematic diagram of the structure of the image generating element in the display device shown in Figure 2 in some other embodiments;

[0089] Figure 11A is a schematic diagram of the structure of the display device in the vehicle shown in Figure 1 in some other embodiments;

[0090] Figure 11B is a schematic diagram of the structure of the display device in the vehicle shown in Figure 1 in some other embodiments;

[0091] Figure 11C is a schematic diagram of the display device in the vehicle shown in Figure 1 in some other embodiments;

[0092] Figure 12 is a schematic diagram of the structure of the display device in the vehicle shown in Figure 1 in some other embodiments. Detailed Implementation

[0093] The embodiments of this application are described below with reference to the accompanying drawings.

[0094] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Multiple" refers to at least two.

[0095] The directional terms mentioned in the embodiments of this application, such as "upper", "lower", "inner", "outer", "top", "bottom", "side", etc., are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0096] In the embodiments of this application, the relative positional relationships mentioned, such as parallel, perpendicular, and aligned, are defined in relation to the current technological level, rather than being absolutely strict. Slight deviations are permissible; approximations of parallelism, perpendicularity, or alignment are all acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 and 10 degrees. Similarly, "A and B are perpendicular" means that A and B are perpendicular or approximately perpendicular, and the angle between A and B can be between 80 and 100 degrees.

[0097] In the embodiments of this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," and "fourth" may explicitly or implicitly include one or more of that feature.

[0098] Please refer to Figure 1, which is a schematic diagram of the vehicle 1000 provided in this application in some embodiments.

[0099] In some embodiments, the vehicle 1000 can be a car, rail vehicle, ship, aircraft, etc. The vehicle can be, but is not limited to, a sedan, multi-purpose vehicle (MPV), sport / suburban utility vehicle (SUV), off-road vehicle (ORV), pickup truck, van, bus, truck, etc. In the embodiment shown in Figure 1, the vehicle 1000 is described as a car; of course, other types of vehicles can also adopt a similar structure, which will not be elaborated further below.

[0100] In some embodiments, the vehicle 1000 may include a vehicle body 200 and a cabin 100, the cabin 100 being mounted on the vehicle body 200. For example, when the vehicle 1000 is a vehicle, the vehicle body 200 may be the vehicle body, and the cabin 100 may be the front or rear cabin of the vehicle.

[0101] For example, the cockpit 100 may include a display device 10, a first seat 20, a second seat 30, and a mounting platform 40. The first seat 20 is closer to the mounting platform 40 than the second seat 30. The mounting platform 40 may be the instrument panel (IP) of the cockpit 100. In this embodiment, the display device 10 may be used to provide entertainment interaction or to provide driver assistance information to the user.

[0102] In some examples, the display device 10 can be mounted on the mounting platform 40 for use by a user located in the first seat 20. The display device 10 can be fixedly mounted on the mounting platform 40, or it can be movably mounted on the mounting platform 40 for storage and display.

[0103] In other examples, the display device 10 may also be installed on the side of the first seat 20 facing away from the mounting platform 40 for use by a user in the second seat 30. The display device 10 may be suspended from the first seat 20, or at least partially embedded within the first seat 20. It should be noted that the display device 10 may be installed on the backrest of the first seat 20 or on the headrest of the first seat 20; specific installation is not limited here.

[0104] The display device 10 can be a light field screen, which can magnify the image source several times and form a projected virtual image at a distance through optical structures such as birdbath optical architecture or pancake optical architecture, thereby realizing a large-format, long-distance, relatively static display within the cockpit 100. For example, the display device 10 can magnify the image source 8 to 12 times and form a projected virtual image at a distance of 2 to 3.5m.

[0105] It should be noted that the display devices 10 with Birdbath optical architecture and Pancake optical architecture will be described in detail later.

[0106] It is understood that Figure 1 only schematically shows some of the components included in the vehicle 1000 and the cabin 100. The actual shape, size, location and construction of these components are not limited by Figure 1. The vehicle 1000 and the cabin 100 may also include more or fewer components than those in Figure 1.

[0107] For example, in some other embodiments, the cockpit 100 may include only the first seat 20 and exclude the second seat 30.

[0108] For example, in some other embodiments, the cockpit 100 may also include a controller (not shown) that can control the display device 10, such as controlling the attitude adjustment of the display device 10, controlling the human-computer interaction of the display device 10, controlling the interaction between the display device 10 and other devices in the cockpit 100 or the vehicle 1000, etc.

[0109] Please refer to Figure 2, which is a schematic diagram of the structure of the display device 10 in some embodiments of the vehicle 1000 shown in Figure 1.

[0110] In some embodiments, the display device 10 may include a housing 1, an image generating element 2, an image magnifying element 3, and a viewing element 4. The image generating element 2, the image magnifying element 3, and the viewing element 4 are all mounted on the housing 1. The image generating element 2 is used to project an image beam. The image beam can be reflected sequentially by the viewing element 4 and the image magnifying element 3, and then emitted from the viewing element 4 to form a display beam. The display beam is used to form a virtual image (see W1 in Figure 2).

[0111] In this embodiment, due to the design of the window element 4 and the image magnification element 3, the image beam can be emitted after two reflections to form a display beam, which increases the optical path of the image beam and thus increases the distance of the virtual image formed by the display beam, so as to achieve the formation of a large-format virtual image at a distance.

[0112] It should be noted that the dashed line with arrows in Figure 2 is a schematic diagram of the beam path in the display device.

[0113] For example, the housing 1 may have a receiving space 11 and a mounting port 131 communicating with the receiving space 11. The image generating element 2 and the image magnifying element 3 are both located in the receiving space 11 and mounted on the housing 1, and the window element 4 is mounted on the mounting port 131.

[0114] In this embodiment, by installing the image generating element 2 and the image magnifying element 3 within the receiving space 11, the housing 1 can enclose and protect the image generating element 2 and the image magnifying element 3.

[0115] The housing 1 may include a first mounting wall 12, a second mounting wall 13, and a third mounting wall 14. The first mounting wall 12 may be disposed opposite to the second mounting wall 13, and the third mounting wall 14 may be disposed opposite to the second mounting wall 13. The image generating element 2 may be mounted on the first mounting wall 12, the second mounting wall 13 may have a mounting opening 131, and the viewing element 4 may be mounted on the second mounting wall 13 and cover the mounting opening 131. The image magnifying element 3 may be mounted on the third mounting wall 14.

[0116] In this embodiment, due to the structural design of the housing 1, the window element 4 can be positioned opposite both the image generating element 2 and the image magnifying element 3. This allows the window element 4 to both receive the image beam projected from the image generating element 2 and reflect the image beam to the image magnifying element 3, and then emit the image beam reflected by the image magnifying element 3 to form a display beam. The optical architecture of this embodiment can be referred to as the Birdbath optical architecture.

[0117] It should be noted that the display device 10 shown in Figure 2 is only schematic and does not limit the specific structure of the housing 1. The housing 1 may also include more walls, such as the mounting wall connecting the first mounting wall 12 and the second mounting wall 13, the mounting wall connecting the second mounting wall 13 and the third mounting wall 14, etc., which are designed according to actual needs.

[0118] The outer casing 1 can enclose the image generating element 2, preventing external moisture, dust, and other impurities from corroding it. Specifically, other mounting walls (not limited to the second mounting wall 13 and the third mounting wall 14) are connected to both sides of the first mounting wall 12, making the first mounting wall 12 the middle of a C-shaped shell structure. In this case, the image generating element 2, mounted on the first mounting wall 12, can be enclosed by the mounting walls on both sides, thus forming waterproof protection for the image generating element 2. Furthermore, when the display device 10 is applied to the cockpit 100 or the vehicle 1000, the light-emitting surface 23 of the image generating element 2 is prevented from facing upwards or diagonally upwards. This prevents moisture and other contaminants from directly intruding into the image generating element 2, which helps to improve the waterproof effect of the image generating element 2. For example, it can achieve an IP52 level of waterproofing.

[0119] Referring to Figure 2, in some embodiments, the image generating element 2 may include an image source body 21 and a base 22. The base 22 may have an accommodating space, and the image source body 21 may be fixed to the bottom wall of the accommodating space. The base 22 may be fixed to the first mounting wall 12.

[0120] In this embodiment, since the image source body 21 can be fixed to the base 22 first, and then the base 22 can be fixed to the first mounting wall 12 to achieve a fixed installation between the image generating element 2 and the housing 1, damage to the image source body 21 caused by the fixed connection between the image source body 21 and the housing 1 can be avoided. For example, it can prevent the image source body 21 from being subjected to pressure during installation, which could lead to uneven display brightness or color. In addition, using the image source body 21 as the light source 211 of the display device 10 is beneficial to improving the display effect of the image of the display device 10, such as improving color saturation.

[0121] For example, the display device 10 may also include a plurality of locking members 5, all of which are located within the receiving space 11. The plurality of locking members 5 are arranged at intervals along the circumference of the base 22. One end of the locking member 5 is fixedly connected to the outer shell 1, and the other end of the locking member 5 is connected to the base 22.

[0122] In this embodiment, the stability of the fixed installation of the image generating element 2 can be improved by arranging multiple locking members 5 at intervals along the circumference of the base 22. The fixed connection between the locking members 5 and the base 22 can be a snap-fit, bolt connection, adhesive connection, etc., and is not limited here.

[0123] The base 22 may include a base 221 and a peripheral wall 222. The peripheral wall 222 is connected to the periphery of the base 221, and the peripheral wall 222 and the bottom wall can enclose and form an accommodating space 223. The bottom wall abuts against the first mounting wall 12, and the opening of the accommodating space 223 faces away from the first mounting wall 12. The image source body 21 is fixed to the base 221 and located within the accommodating space 223, and the periphery of the image source body 21 and the peripheral wall 222 are spaced apart. The locking member 5 extends away from the outer shell 1 to the gap between the image source body 21 and the peripheral wall 222, and abuts against the peripheral wall 222 towards the first mounting wall 12.

[0124] In this embodiment, since the locking member 5 extends to the gap between the image source body 21 and the peripheral sidewall 222, and the locking member 5 abuts against the peripheral sidewall 222 in the direction of the first mounting wall 12, it can play a role in preventing detachment, reducing the risk of the image generating element 2 detaching from the locking member 5, and improving the installation stability of the image generating element 2.

[0125] In some other embodiments, the end of the locking member 5 connected to the housing 1 is rotatable, so that the locking member 5 is rotatably connected to the housing 1. In this way, when multiple locking members 5 rotate in opposite directions, space can be provided for the image generating element 2 to be installed or removed. When multiple locking members 5 rotate in opposite directions, the image generating element 2 can be locked, so as to achieve the fixed installation of the image generating element 2.

[0126] In some embodiments, the length of the image generating element 2 can be in the range of 125mm to 155mm, the width can be in the range of 60mm to 75mm, and the thickness can be in the range of 10mm to 20mm, so as to reduce the size of the image generating element 2. This not only facilitates the installation and arrangement of the image generating element 2 in the housing 1, but also helps to reduce the overall size of the display device 10.

[0127] In some embodiments, the display brightness of the image generating element 2 can be greater than 2000 nits, thereby enabling the output brightness of the display device 10 to be greater than or equal to 500 nits, thus achieving high-brightness imaging and improving the user experience of the display device 10.

[0128] In some embodiments, the display resolution of the image generating element 2 is greater than or equal to 400 PPI, thereby enabling the resolution of the virtual image angle formed by the display device 10 to meet 90 PPD, achieving high-definition virtual image display and improving the user experience of the display device 10.

[0129] In some embodiments, the display color gamut value of the image generating element 2 can be greater than or equal to 75%, so that the off-screen display of the display device 10 has a good display color gamut, thereby making the color saturation of the virtual image formed by the display device 10 high and improving the display quality.

[0130] Please continue to refer to Figure 2. In some embodiments, the image beam projected by the image generating element 2 can cover the window element 4. In other words, the projection angle of the image beam projected by the image generating element 2 is greater than the coupling angle between the image generating element 2 and the window element 4, so that the brightness uniformity of the virtual image finally formed by the display device 10 is high.

[0131] It should be noted that the projection angle of the image beam projected by the image generating element 2 refers to the maximum angle between the image beam and the normal of the light emitting surface 23. The coupling angle between the image generating element 2 and the window element 4 refers to the maximum angle between the image beam incident from the image generating element to the window element 4 and the normal of the light emitting surface 23.

[0132] For example, the projection angle of the image beam is less than or equal to a first preset value so that the projection angle of the image beam is not too large, thereby avoiding excessive projection of the image beam onto the inner wall of the housing 1, thereby reducing or even avoiding stray light that is reflected on the inner wall of the housing 1 and interfering with imaging, which is beneficial to improving the imaging quality of the display device 10.

[0133] It should be noted that the size of the first preset value can be adaptively adjusted according to the actual optical path structure of the display device 10. Specifically, on the one hand, it is designed according to the coupling angle between the image generating element 2 and the window element 4 so that the image beam projected by the image generating element 2 can cover the window element 4 and achieve uniform imaging brightness; on the other hand, it is designed according to the reflection formed on the inner wall of the housing 1 by the part of the image beam projected by the image generating element 2 that exceeds the window element 4 so that this part of the image beam will not form too much reflected stray light that interferes with imaging on the inner wall of the housing 1.

[0134] The first preset value may include a first value and a second value, wherein the first value and the second value correspond to the maximum value of the projection angle of the image beam in different directions.

[0135] In this embodiment, based on the risk of stray light forming in different directions of the image beam, different projection angles can be designed in different directions, thereby increasing the projection angle to improve the uniformity of imaging while ensuring that the risk of stray light is small.

[0136] Specifically, the first value corresponds to the maximum value of the projection angle of the image beam in the first direction D1, and the second value corresponds to the maximum value of the projection angle of the image beam in the second direction D2. The risk of stray light interfering with imaging when the image beam is projected onto the inner wall of the outer casing 1 in the first direction D1 is lower than the risk of stray light interfering with imaging when it is projected onto the inner wall of the outer casing 1 in the second direction D2. The first value can be greater than the second value.

[0137] In this embodiment, based on the different risks of stray light being generated when the image beam is projected onto the inner wall of the housing 1 in the first direction D1 and the second direction D2, the first and second values ​​are adaptively designed so that the risk of stray light can be reduced and the uniformity of imaging can be improved.

[0138] The plane formed by connecting the center of image generating element 2, the center of window element 4, and the center of image magnifying element 3 can be regarded as the arrangement plane. Image generating element 2, window element 4, and image magnifying element 3 are arranged according to the arrangement plane. The first direction D1 is perpendicular to the arrangement plane, and the second direction D2 is parallel to the arrangement plane.

[0139] In this embodiment, since the first direction D1 is perpendicular to the arrangement plane, when the image beam is projected onto the inner wall of the housing 1 along the first direction D1, the probability of the reflected light being reflected onto the viewing window element 4 or the image magnification element 3 is low, thus reducing the risk of image interference. Since the second direction D2 is parallel to the arrangement plane, when the image beam is projected onto the inner wall of the housing 1 along the second direction D2, the probability of the reflected light being reflected onto the viewing window element 4 or the image magnification element 3 is high, thus increasing the risk of image interference. Therefore, the first value can be designed to be larger than the second value without increasing the risk of stray light interference in image formation.

[0140] It should be noted that the first direction D1 can be regarded as the direction perpendicular to the paper from the perspective shown in Figure 2, and the second direction D2 can be regarded as the direction parallel to the paper from the perspective shown in Figure 2.

[0141] The first value can be greater than the maximum angle between the beam of light projected by the image generating element 2 onto the window element 4 in the first direction D1 and the normal of the light emitting surface 23, and the second value can be greater than the maximum angle between the beam of light projected by the image generating element 2 onto the window element 4 in the second direction D2 and the normal of the light emitting surface 23. In this way, the uniformity of the projected image can be improved in both the first direction D1 and the second direction D2, thereby improving the overall uniformity of the image of the display device 10.

[0142] For example, in the first direction D1, the maximum angle between the light beam projected by the image generating element 2 onto the window element 4 and the normal of the light emitting surface 23 is in the range of 20° to 28°, for example, it can be 20°, or 22°, or 25°, or 28°, or other values ​​between 20° and 28°.

[0143] The first value can be 50°. In this case, the projection angle of the image generating element 2 in the first direction D1 is less than or equal to 50°. This design allows the image beam projected by the image generating element 2 to better cover the window element 4 in the first direction D1, achieving better imaging uniformity. In addition, the image beam will not be projected excessively onto the inner wall of the housing 1 in the first direction D1, thereby reducing the risk of stray light being formed by reflection on the inner wall of the housing 1.

[0144] It should be noted that, in the first direction D1, the maximum angle between the light beam projected from the image generating element 2 to the window element 4 and the normal of the light emitting surface 23 is designed to be correlated with the first value, and the two are positively correlated. Therefore, in practical applications, the design angle can be adaptively adjusted so that it is not limited to the above design value. For example, when the maximum angle between the light beam projected from the image generating element 2 to the window element 4 and the normal of the light emitting surface 23 in the first direction D1 is in the range of 30° to 38°, the first value can be designed to be 60°.

[0145] For example, in the second direction D2, the maximum angle between the light beam projected by the image generating element 2 onto the window element 4 and the normal of the light emitting surface 23 is in the range of 11° to 13°, for example, it can be 20°, or 22°, or 25°, or 28°, or other values ​​between 20° and 28°.

[0146] The second value can be 30°. In this case, the projection angle of the image generating element 2 in the second direction D2 is less than or equal to 30°. This design allows the image beam projected by the image generating element 2 to better cover the window element 4 in the second direction D2, achieving better imaging uniformity. In addition, the image beam will not be projected excessively onto the inner wall of the housing 1 in the second direction D2, thereby reducing the risk of stray light being formed by reflection on the inner wall of the housing 1.

[0147] It should be noted that, in the second direction D2, the maximum angle between the light beam projected from the image generating element 2 to the window element 4 and the normal of the light emitting surface 23 is designed to be correlated with the second value, and the two are positively correlated. Therefore, in practical applications, the design angle can be adaptively adjusted so that it is not limited to the above design value. For example, when the maximum angle between the light beam projected from the image generating element 2 to the window element 4 and the normal of the light emitting surface 23 in the second direction D2 is in the range of 16° to 18°, the second value can be designed to be 35°.

[0148] It should be noted that when designing the display device 10, if it is difficult to guarantee the projection angle of the image generating element 2 in multiple directions, priority should be given to guaranteeing the projection angle in the direction with a higher risk of stray light. In other words, if it is difficult to design the first and second values ​​at the same time, priority should be given to guaranteeing the design of the second value, so as to avoid excessive reflection of the image beam projected by the image generating element 2 on the inner wall of the housing 1 in the second direction D2, thereby reducing or even eliminating stray light emitted through the window element 4, and thus reducing the risk of stray light.

[0149] Please refer to Figures 2 and 3. Figure 3 is a schematic diagram of the light emission of the image generating element 2 in some embodiments of the display device 10 shown in Figure 2.

[0150] In some embodiments, the light-emitting surface 23 of the image generating element 2 may include a first long side 231, a first short side 232, a second long side 233, and a second short side 234 connected end to end. The first long side 231 and the second long side 233 are arranged opposite to each other, and the first short side 232 and the second short side 234 are arranged opposite to each other. A first direction D1 is parallel to the first short side 232 and points towards the second short side 234, and a second direction D2 is parallel to the first long side 231 and points towards the second long side 233.

[0151] In this embodiment, the long and short sides of the light-emitting surface 23 are designed as described above so that the virtual image formed by the display device 10 is horizontal, which conforms to the user's viewing habits.

[0152] It should be noted that in some other embodiments, the length and width directions of the light-emitting surface 23 can also be other directions. For example, the first direction D1 can be parallel to the first long side 231 and point to the second long side 233, and the second direction D2 can be parallel to the first short side 232 and point to the second short side 234. In this case, the virtual image formed by the display device 10 is vertical. In this application, the first direction D1 being parallel to the first short side 232 and pointing to the second short side 234, and the second direction D2 being parallel to the first long side 231 and pointing to the second long side 233 are used for illustrative purposes.

[0153] For example, the image generating element 2 has a first projection field of view HFOV in the first direction D1 and a second projection field of view VFOV in the second direction D2.

[0154] It should be noted that the first projection field of view (HFOV) refers to the distribution range of the image beam projected by the image generating element 2 in the first direction D1. The maximum angle between the first projection field of view (HFOV) and the normal of the light-emitting surface 23 is the projection angle of the image beam in the first direction D1. Therefore, the angle between the edge of the first projection field of view (HFOV) and the normal of the light-emitting surface 23 is less than or equal to the first value. The second projection field of view (VFOV) refers to the distribution range of the image beam projected by the image generating element 2 in the second direction D2. The maximum angle between the second projection field of view (VFOV) and the normal of the light-emitting surface 23 is the projection angle of the image beam in the second direction D2. Therefore, the angle between the edge of the second projection field of view (VFOV) and the normal of the light-emitting surface 23 is less than or equal to the second value.

[0155] The image beam projected through the center of the light-emitting surface 23 has a first brightness. Within the first projection field of view (HFOV), the image beam forming a 30° angle with the normal to the light-emitting surface 23 has a second brightness, and the ratio of the second brightness to the first brightness can be greater than or equal to 50%.

[0156] In this embodiment, the image beam projected by the image generating element 2 is designed as described above, which can make the brightness of the image beam received by the edge region of the window element 4 in the first direction D1 higher. This is beneficial to achieving high uniformity of the image beam projected by the image generating element 2 to the window element 4 in the first direction D1, thereby facilitating high brightness uniformity of the virtual image formed by the display device 10 in the first direction D1.

[0157] Within the second projection field of view (VFOV), the image beam that forms a 15° angle with the normal of the light-emitting surface 23 has a third brightness, and the ratio of the third brightness to the first brightness can be greater than or equal to 50%.

[0158] In this embodiment, the image beam projected by the image generating element 2 is designed as described above, which can make the brightness of the image beam received by the edge region of the window element 4 in the second direction D2 higher. This is beneficial to achieving high uniformity of the image beam projected by the image generating element 2 to the window element 4 in the second direction D2, thereby facilitating high brightness uniformity of the virtual image formed by the display device 10 in the second direction D2.

[0159] In this embodiment, when the image beam projected by the image generating element 2 is designed according to the above embodiment in both the first direction D1 and the second direction D2, the edge areas around the window element 4 can receive the image beam with higher brightness. This makes the overall uniformity of the image beam projected by the image generating element 2 onto the window element 4 higher, which is beneficial to achieving high overall brightness uniformity of the virtual image formed by the display device 10.

[0160] The brightness uniformity of the display beam on the viewing element 4 is greater than or equal to 80%. For example, this brightness uniformity can be, but is not limited to, 80%, 83%, 86%, 89%, 92%, 95%, or other values ​​greater than 80%.

[0161] It should be noted that brightness uniformity refers to the ratio of the minimum brightness to the maximum brightness when multiple points (e.g., nine points) are taken on the test object.

[0162] In this embodiment, since the display beam is emitted from the viewing window element 4 and projected onto the user's eye (which can be considered as an eye box), a virtual image can be formed at a distance. Since the user needs to look through the viewing window element 4 to see the virtual image, the brightness uniformity of the virtual image is consistent with the brightness uniformity of the display beam on the viewing window element 4. Therefore, the brightness uniformity of the display beam on the viewing window element 4 satisfies the above design, enabling the brightness uniformity of the virtual image formed by the display device 10 to be greater than or equal to 80%, resulting in high image quality.

[0163] It should be noted that the brightness uniformity of the display beam on the window element 4 is related to the design of the second and third brightness levels mentioned above. The design of the second and third brightness levels is beneficial to improving the brightness uniformity of the display beam on the window element 4.

[0164] In some embodiments, within the first projection field of view (HFOV), the image beam forming a 50° angle with the normal of the light-emitting surface 23 has a fourth brightness, the ratio of the fourth brightness to the first brightness being less than or equal to 10%.

[0165] In this embodiment, the image beam projected by the image generating element 2 is designed as described above, which enables the edge region of the image beam projected by the image generating element 2 to have a lower brightness in the first direction D1. As a result, the brightness of the image beam incident on the inner wall of the housing 1 in the first direction D1 is lower. After being reflected by the inner wall of the housing 1, its brightness will decrease rapidly and further reduce, which helps to reduce the risk of stray light reflecting on the inner wall of the housing 1 and forming interference with imaging.

[0166] In some embodiments, within the second projection field of view (VFOV), the image beam forming a 30° angle with the normal to the light-emitting surface 23 has a fifth brightness, the ratio of the fifth brightness to the first brightness being less than or equal to 10%.

[0167] In this embodiment, the image beam projected by the image generating element 2 is designed as described above, which enables the edge region of the image beam projected by the image generating element 2 to have a lower brightness in the second direction D2. As a result, the brightness of the image beam incident on the inner wall of the housing 1 in the second direction D2 is lower. After being reflected by the inner wall of the housing 1, its brightness will decrease rapidly and further reduce, which helps to reduce the risk of stray light that interferes with imaging due to reflection on the inner wall of the housing 1.

[0168] In this embodiment, the image beam projected by the image generating element 2 follows the aforementioned fourth and fifth brightness designs in both the first direction D1 and the second direction D2. This design results in low brightness of the image beam at large angles, and rapid attenuation after reflection on the inner wall of the housing 1. After multiple reflections on the inner wall of the housing 1, the proportion of light reflected from the housing 1 entering the human eye is greatly reduced (e.g., the stray light ratio can be less than 1 / 1000), achieving no stray light sensing within the cavity. In other words, the brightness / intensity of stray light is far lower than the brightness / intensity of the virtual image formed by the display device 10, so that the human eye is essentially unaware of stray light.

[0169] Please continue to refer to Figures 2 and 4. Figure 4 is a schematic diagram of the structure of the image generating element 2 in some embodiments of the display device 10 shown in Figure 2.

[0170] In some embodiments, the image source body 21 of the image generating element 2 may include a light source 211, a backlight collimator 212, and a light-transmitting panel 213 arranged in sequence. The backlight collimator 212 is used to collimate the light beam emitted from the light source 211, and the light-transmitting panel 213 is used to transmit the light beam collimated by the backlight collimator 212.

[0171] In this embodiment, by designing the backlight collimator 212, the projection angle of the image beam emitted from the image generating element 2 can be reduced so that the projection angle of the image beam can meet the first preset value mentioned above. This prevents the projection angle of the image beam from being too large, avoids excessive projection of the image beam onto the inner wall of the housing 1, thereby reducing or even avoiding stray light that is reflected on the inner wall of the housing 1 and interfering with imaging, which is beneficial to improving the imaging quality of the display device 10.

[0172] Please refer to Figures 4 to 5C. Figure 5A is a structural schematic diagram of the backlight collimator 212 in the image generating element 2 shown in Figure 4 in some embodiments; Figure 5B is a schematic diagram of the first prism 2121 in the backlight collimator 212 shown in Figure 5A collimating the light beam in some embodiments; Figure 5C is a schematic diagram of the second prism 2122 in the backlight collimator 212 shown in Figure 5A collimating the light beam in some embodiments.

[0173] In some embodiments, the backlight collimator 212 may include a first prism 2121 and a second prism 2122 stacked together. The first prism 2121 is used to collimate the light beam emitted from the light source 211 in a first direction D1, and the second prism 2122 is used to collimate the light beam emitted from the light source 211 in a second direction D2.

[0174] In this embodiment, the first prism 2121 can collimate the light beam emitted from the light source 211 in the first direction D1, thereby reducing the projection angle of the light beam emitted from the light source 211 in the first direction D1. This allows the projection angle of the image light beam emitted from the image generating element 2 in the first direction D1 to be less than or equal to a first value, so that the image light beam will not be projected excessively onto the inner wall of the housing 1 in the first direction D1, thereby reducing the risk of stray light being reflected on the inner wall of the housing 1.

[0175] In this embodiment, the second prism 2122 can collimate the light beam emitted from the light source 211 in the second direction D2, thereby reducing the projection angle of the light beam emitted from the light source 211 in the second direction D2. This allows the projection angle of the image beam emitted from the image generating element 2 in the second direction D2 to be less than or equal to the second value, so that the image beam will not be projected excessively onto the inner wall of the housing 1 in the second direction D2, thereby reducing the risk of stray light being reflected on the inner wall of the housing 1.

[0176] In some examples, the first prism 2121 is closer to the light source 211 than the second prism 2122, while in other examples, the second prism 2122 is closer to the light source 211 than the first prism 2121. It is understood that the relative positional relationship between the first prism 2121 and the second prism 2122 is not limited here, as long as they can be stacked to achieve beam collimation in the first direction D1 and the second direction D2.

[0177] Please refer to Figures 6A and 6B. Figure 6A is a structural schematic diagram of the backlight collimator 212 in the image generating element 2 shown in Figure 4 in some other embodiments; Figure 6B is a structural schematic diagram of the privacy film 2123 in the backlight collimator 212 shown in Figure 6A in some embodiments.

[0178] In some embodiments, the backlight collimator 212 may further include a privacy film 2123, which is stacked with the first prism 2121 and the second prism 2122. The privacy film 2123 may include a plurality of gratings 2124, which are arranged at intervals along a direction parallel to the second direction D2.

[0179] In this embodiment, the privacy film 2123 is designed to reduce the projection angle of the light beam emitted from the light source 211 in the second direction D2, thereby further reducing the projection angle of the image beam in the second direction D2. This helps to further reduce the probability of the image beam being projected onto the inner wall of the housing 1 in the second direction D2, thereby reducing the risk of stray light being reflected on the inner wall of the housing 1.

[0180] It should be noted that, in this application, since the risk of stray light generated when the image beam is projected onto the inner wall of the housing 1 in the second direction D2 is higher than that when the image beam is projected onto the inner wall of the housing 1 in the first direction D1, a privacy screen 2123 can be added, and multiple gratings 2124 in the privacy screen 2123 are arranged at intervals parallel to the second direction D2 to further limit the projection angle of the beam emitted by the light source 211 in the second direction D2. It is understood that in some other embodiments, if the risk of stray light generated when the image beam is projected onto the inner wall of the housing 1 in the first direction D1 is higher, the multiple gratings 2124 in the privacy screen 2123 are arranged at intervals parallel to the first direction D1.

[0181] In some examples, the privacy screen 2123 may be disposed on the side of the first prism 2121 facing away from the second prism 2122; in other examples, the privacy screen 2123 may be disposed on the side of the second prism 2122 facing away from the first prism 2121; in still other examples, the privacy screen 2123 may be disposed between the first prism 2121 and the second prism 2122.

[0182] Please refer to Figure 7, which is a schematic diagram of the structure of the light source 211 in the image generating element 2 shown in Figure 4 in some embodiments.

[0183] In some embodiments, the light source 211 may include a light strip 2111 and a light guide plate 2112. The light guide plate 2112 is stacked with the backlight collimator 212, and the light strip 2111 is disposed at the end of the light guide plate 2112.

[0184] In this embodiment, the combination of the light strip 2111 and the light guide plate 2112 forms a side-lit backlight structure. Due to the presence of the light guide plate 2112, the side-lit backlight structure enables the light source 211 to emit light more uniformly, thereby improving the uniformity of light emission.

[0185] For example, there can be multiple light strips 2111, which can be disposed at the ends of different sides of the light guide plate 2112 to improve the incident light brightness. In addition, under the same incident light brightness, by setting multiple light strips 2111, the thickness of a single light strip 2111 and the light guide plate 2112 can be reduced, which is beneficial to achieving a thinner and lighter design of the light source 211, thereby facilitating a thinner and lighter design of the image generating element 2.

[0186] Among them, the display color gamut value of the light strip 2111 can be greater than or equal to 80%, which is conducive to realizing the high color gamut display of the image generating element 2 and improving the imaging quality of the display device 10.

[0187] For example, the light strip 2111 can be a light-emitting diode (LED) light strip, a mini light-emitting diode (Mini LED) light strip, a micro light-emitting diode (Micro LED) light strip, etc.

[0188] Please refer to Figures 8A and 8B in conjunction with the following: Figure 8A is a schematic diagram of the structure of the light source 211 in the image generating element 2 shown in Figure 4 in some other embodiments; Figure 8B is a schematic diagram of the structure of the backlight collimator 212 in the image generating element 2 shown in Figure 8A in some embodiments.

[0189] In some embodiments, the light source 211 includes a plurality of LED beads 2113 arranged in an array, and the plurality of LED beads 2113 are stacked with the backlight collimator 212.

[0190] In this embodiment, the array of multiple LED beads 2113 can be designed as a direct-lit backlight structure. Since the direct-lit backlight structure can emit light directly toward the light-transmitting panel 213 through multiple LED beads 2113, the light source 211 has a higher brightness, which is beneficial to improve the light output brightness of the image generating element 2, thereby improving the light output brightness of the display device 10.

[0191] For example, the image generating element 2 may include multiple display areas 24, and the LEDs 2113 located in different display areas 24 may be connected in parallel.

[0192] In this embodiment, by partitioning the image generating element 2, the LED beads 2113 in different display areas 24 can be controlled independently, thereby enabling local dimming. In this way, the brightness of the LED beads 2113 in different display areas 24 can be adjusted according to different application scenarios to achieve diversified display scenarios.

[0193] For example, a dark field can be achieved by turning off or reducing the brightness of some LED beads 2113 in the display area 24 through local dimming. This reduces the backlight brightness in the dark field area, making the black purer and creating a stronger contrast with the bright area. This makes the bright parts of the picture brighter and the dark parts darker, effectively improving the overall contrast and making the picture more vivid and realistic with richer details.

[0194] It should be noted that in some other embodiments, multiple LEDs 2113 can also achieve overall dimming control without local dimming.

[0195] Among them, the lamp bead 2113 can be an LED lamp bead, a Mini LED lamp bead, a Micro LED lamp bead, etc.

[0196] For example, the backlight collimator 212 may include a light-collecting lens 2125 and a diffuser 2126 stacked together, with the light-collecting lens 2125 intersecting the diffuser 2126 near the light source 211.

[0197] In this embodiment, since the light beam emitted by the lamp bead 2113 is a divergent light beam, the light beam can be converged first by the light-collecting lens 2125 to avoid the light beam being too divergent, and then diffused by the diffuser film 2126. Since the diffuser film 2126 has a weaker ability to refract light than the light-collecting lens 2125, the light beam emitted by the lamp bead 2113 can be collimated in the end, reducing the projection angle of the light beam emitted by the image generating element 2.

[0198] The number of light-collecting lenses 2125 can be multiple, and the number of light-collecting lenses 2125 is the same as the number of lamp beads 2113, with one light-collecting lens 2125 corresponding to one lamp bead 2113.

[0199] In this embodiment, by setting the light-collecting lens 2125 in a one-to-one correspondence with the lamp bead 2113, it is beneficial to improve the focusing effect of the light-collecting lens 2125 on the light beam emitted by the lamp bead 2113, thereby improving the final collimation effect of the light beam emitted by the lamp bead 2113.

[0200] It should be noted that the image generating element 2 shown in Figure 8A can also adopt the backlight collimation scheme shown in Figures 5A to 6B, which will not be elaborated here.

[0201] Please refer to Figures 8A and 9. Figure 9 is a schematic diagram of the structure of the image generating element 2 shown in Figure 8A, in some embodiments, with an additional quantum dot film 214.

[0202] In some embodiments, the image source body of the image generating element 2 may further include a quantum dot (QD) film 214, which is disposed between the backlight collimator 212 and the light source 211.

[0203] In this embodiment, the LED bead 2113 can excite the quantum dot film 214, thereby narrowing the RGB three-color light width, thereby improving the display color gamut of the image generating element 2, and further improving the display color gamut of the display device 10. For example, the display color gamut value of the display device 10 can be greater than or equal to 85%.

[0204] Please refer to Figures 2, 10A and 10B. Figure 10A is a schematic diagram of the image generating element 2 in the display device 10 shown in Figure 2 in some embodiments; Figure 10B is a schematic diagram of the image generating element 2 in the display device 10 shown in Figure 2 in other embodiments.

[0205] In some embodiments, the display device 10 may further include a viewing angle compensation film 6, which may be located on the propagation path of the image beam. The display beam has a first emission brightness at the edge of the window element 4, and the display device 10 has a second emission brightness at the center of the window element 4. The ratio of the first emission brightness to the second emission brightness may be within a first preset range.

[0206] In this embodiment, the design of the viewing angle compensation film 6 allows for phase compensation of the image beam along its propagation path. This ensures that the phase of the image beam emitted at an angle to the light-emitting surface 23 is nearly identical to the phase of the image beam emitted from the center of the light-emitting surface 23. Consequently, the phase of the display beam emitted through the window element 4 becomes nearly uniform, resulting in the first emitted brightness being nearly identical to the second emitted brightness. In other words, the ratio of the first emitted brightness to the second emitted brightness is within a first preset range. This design ensures high uniformity of brightness across the virtual image formed by the display device 10, preventing the whitening of the four corners of the virtual image and allowing the background of the virtual image to present a black field effect to the user. This provides an immersive viewing experience and improves the user experience.

[0207] For example, the first preset range can be 1 to 1.2, for example, it can be 1, or 1.02, or 1.04, or 1.06, or 1.08, or 1.1, or 1.12, or 1.14, or 1.16, or 1.18, or 1.2, or other values ​​between 1 and 1.2.

[0208] In this embodiment, the first preset range satisfies the above design, which can achieve a high consistency between the first emitted light brightness and the second emitted light brightness, effectively avoid the phenomenon of whitening at the four corners of the virtual image, and make the display background of the virtual image present a black field feeling to the user, thereby bringing an immersive viewing experience to the user and improving the user experience.

[0209] It should be noted that the first preset range can be adjusted according to the actual application. For example, in some optical path designs, the upper limit of the first preset range can be greater than 1.2, which can still avoid the phenomenon of whitening around the virtual image and present a black screen viewing experience. In other optical path designs, the lower limit of the first preset range can be less than 1, which can still avoid the phenomenon of whitening around the virtual image and present a black screen viewing experience.

[0210] For example, the viewing angle compensation film 6 can be adhered to the image generating element 2 so that the image beam emitted through the image generating element 2 has undergone phase compensation, and the brightness of the image beam emitted at the edge of the image generating element 2 is highly consistent with the brightness of the image beam emitted at the center of the image generating element 2. As a result, after the image beam is reflected by the window element 4 and the image magnification element 3 in sequence, the display beam emitted from the window element 4 can form a display beam with high consistency between the peripheral brightness and the central brightness. This allows the virtual image formed by the display device 10 to avoid the phenomenon of whitening at the four corners and improve the imaging quality.

[0211] In some examples, the viewing angle compensation film 6 can be adhered to the surface of the light-transmitting panel 213 facing the light source 211; in other examples, the viewing angle compensation film 6 can be adhered to the surface of the light-transmitting panel 213 facing away from the light source 211.

[0212] It should be noted that the image generating element 2 provided in this application can be applied not only to light field screens, but also to other display devices, such as head-up displays and instrument displays.

[0213] Please refer to Figures 11A to 11C. Figure 11A is a structural schematic diagram of the display device 10 in the vehicle 1000 shown in Figure 1 in some other embodiments; Figure 11B is a structural schematic diagram of the display device 10 in the vehicle 1000 shown in Figure 1 in some further embodiments; and Figure 11C is a structural schematic diagram of the display device 10 in the vehicle 1000 shown in Figure 1 in some yet other embodiments.

[0214] It should be noted that the display device 10 shown in Figures 11A to 11C may include some structural features of the display device 10 provided in any of the foregoing embodiments, and the same features will not be described again here.

[0215] In some embodiments, the viewing angle compensation film 6 can be adhered to the window element 4 so that the phase of the image beam can be compensated at the window element 4 between the image beam being emitted through the window element 4 to form the display beam. This makes the brightness of the display beam at the edge of the window element 4 more consistent with the brightness of the display beam at the center of the window element 4, resulting in high uniformity of brightness throughout the virtual image formed by the display device 10. This avoids the phenomenon of whitening at the four corners of the virtual image, allowing the display background of the virtual image to present a black field to the user, thereby providing the user with an immersive viewing experience and improving the user experience.

[0216] In some examples, referring to Figure 11A, the viewing angle compensation film 6 can be adhered to the surface of the viewing element 4 facing the receiving space 11. Since the viewing angle compensation film 6 is located within the receiving space 11, the viewing element 4 can form a protective layer for the viewing angle compensation film 6, thereby enabling the viewing angle compensation film 6 to improve image quality and also protect the viewing angle compensation film 6.

[0217] In some other examples, see Figure 11B, the viewing angle compensation film 6 can be adhered to the surface of the window element 4 facing away from the receiving space 11. This design allows the viewing angle compensation film 6 to achieve phase compensation of the light beam when the display device 10 finally emits light, which helps to improve the phase compensation accuracy and thus improve the image quality.

[0218] In some other examples, referring to Figure 11C, the viewing element 4 may include a first portion 4a and a second portion 4b, with the viewing angle compensation film 6 bonded to the first portion and the second portion of the viewing element 4. This design not only allows the viewing angle compensation film 6 to be protected by the viewing element 4, but also enables improved image quality through the viewing angle compensation film 6.

[0219] Please refer to Figure 12, which is a structural schematic diagram of the display device 10 in the vehicle 1000 shown in Figure 1 in some other embodiments.

[0220] It should be noted that the display device 10 shown in FIG12 may include some structural features of the display device 10 provided in any of the foregoing embodiments, and the same features will not be described again here.

[0221] In some embodiments, the first mounting wall 12 and the second mounting wall 13 can be arranged opposite to each other. The image generating element 2 can be mounted on the first mounting wall 12, and the second mounting wall 13 has a mounting opening 131. The viewing element 4 is mounted on the second mounting wall 13 and covers the mounting opening 131. The image magnifying element 3 is located between the image generating element 2 and the viewing element 4. The image magnifying element 3 is also used to project an image beam toward the viewing element 4 through the image magnifying element 3.

[0222] In this embodiment, the image beam emitted from the image generating element 2 passes through the image magnifying element 3, is reflected sequentially by the viewing window element 4 and the image magnifying element 3, and then exits through the viewing window element 4. This increases the optical path of the image beam within the housing 1, thereby increasing the size and distance of the virtual image. Furthermore, since the image magnifying element 3 is positioned between the viewing window element 4 and the image generating element 2, the overall size of the display device 10 can be further reduced, achieving a miniaturized design. The optical architecture of this embodiment can be referred to as the Pancake optical architecture.

[0223] It should be noted that the dashed line with arrows in Figure 12 is a schematic diagram of the beam path in the display device 10.

[0224] It should be noted that the optical path architecture provided in this application embodiment can achieve optical path folding design by using one or more film layer structures among semi-transparent and semi-reflective films, quarter-wave plates, and polarizers in conjunction with polarized light. The specific structural design is not limited here, as long as it can realize the Birdbath optical architecture shown in Figure 2 and the Pancake optical structure shown in Figure 12.

[0225] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other, and any combination of features in different embodiments is also within the protection scope of this application. That is to say, the multiple embodiments described above can also be arbitrarily combined according to actual needs.

[0226] It should be noted that all the above figures are exemplary illustrations of this application and do not represent the actual size of the product. Furthermore, the dimensional proportions between the components in the figures are not intended to limit the actual product of this application.

[0227] The above are merely some embodiments and implementation methods of this application. The scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A display device, characterized in that, It includes a housing, an image generating element, an image magnifying element, a viewing window element, and a viewing angle compensation film; The housing has a receiving space and a mounting port communicating with the receiving space. The image generating element and the image magnifying element are both located in the receiving space and mounted on the housing. The window element is mounted on the mounting port. The image generating element is used to project an image beam, which is reflected sequentially by the window element and the image magnifying element, and then emitted by the window element to form a display beam, which is used to form a virtual image; The projection angle of the image beam is less than or equal to a first preset value, the viewing angle compensation film is located on the propagation path of the image beam, the display beam has a first emission brightness at the edge of the window element, the display beam has a second emission brightness at the center of the window element, and the ratio of the first emission brightness to the second emission brightness is within a first preset range.

2. The display device as claimed in claim 1, characterized in that, The first preset range is 1 to 1.

2.

3. The display device as described in claim 1 or 2, characterized in that, The view compensation film is adhered to the image generating element, or to the view window element.

4. The display device as claimed in claim 3, characterized in that, The viewing angle compensation film is adhered to the surface of the window element facing the receiving space, or to the surface of the window element facing away from the receiving space, or the window element includes a first part and a second part, and the viewing angle compensation film is adhered to the first part and the second part of the window element.

5. The display device as claimed in claim 3, characterized in that, The image generating element includes a stacked light source and a light-transmitting panel; The viewing angle compensation film is adhered to the surface of the light-transmitting panel facing away from the light source, or to the surface of the light-transmitting panel facing the light source.

6. The display device as claimed in any one of claims 1 to 5, characterized in that, The first preset value includes a first value and a second value, wherein the first value is 50° and the second value is 30°, and the first value and the second value correspond to the maximum values ​​of the projection angles of the image beam in different directions.

7. The display device as claimed in claim 6, characterized in that, The image generating element has a light-emitting surface, which includes a first long side, a first short side, a second long side, and a second short side connected end to end in sequence. The first long side and the second long side are arranged opposite to each other, and the first short side and the second short side are arranged opposite to each other. The image generating element has a first projection field of view in a first direction and a second projection field of view in a second direction. The first direction is parallel to the first short side and points to the second short side, and the second direction is parallel to the first long side and points to the second long side. The angle between the edge of the first projection field of view and the normal of the light-emitting surface is less than or equal to the first value, and the angle between the edge of the second projection field of view and the normal of the light-emitting surface is less than or equal to the second value.

8. The display device as claimed in claim 7, characterized in that, The image beam covers the window element; In the first direction, the maximum angle between the light beam projected by the image generating element onto the window element and the normal of the light-emitting surface is in the range of 20° to 28°. And / or, in the second direction, the maximum angle between the light beam projected by the image generating element onto the window element and the normal of the light-emitting surface is in the range of 11° to 13°.

9. The display device as claimed in claim 8, characterized in that, The image beam projected through the center of the light-emitting surface has a first brightness; Within the first projection field of view, the image beam that forms a 30° angle with the normal of the light-emitting surface has a second brightness, and the ratio of the second brightness to the first brightness is greater than or equal to 50%. And / or, within the second projection field of view, the image beam forming a 15° angle with the normal to the light-emitting surface has a third brightness, the ratio of the third brightness to the first brightness being greater than or equal to 50%.

10. The display device as claimed in claim 8 or 9, characterized in that, Within the first projection field of view, the image beam that forms a 50° angle with the normal of the light-emitting surface has a fourth brightness, the ratio of the fourth brightness to the first brightness being less than or equal to 10%. And / or, within the second projection field of view, the image beam forming a 30° angle with the normal to the light-emitting surface has a fifth brightness, the ratio of the fifth brightness to the first brightness being less than or equal to 10%.

11. The display device as claimed in any one of claims 8 to 10, characterized in that, The brightness uniformity of the display beam on the window element is greater than or equal to 80%.

12. The display device as claimed in any one of claims 7 to 11, characterized in that, The image generating element includes a light source, a backlight collimator, and a light-transmitting panel arranged in sequence. The backlight collimator is used to collimate the light beam emitted from the light source, and the light-transmitting panel is used to transmit the light beam collimated by the backlight collimator.

13. The display device as claimed in claim 12, characterized in that, The light source includes a light strip and a light guide plate, the light guide plate and the backlight collimator are stacked together, and the light strip is disposed at the end of the light guide plate; Alternatively, the light source may include a plurality of LEDs arranged in an array, with the plurality of LEDs stacked on top of the backlight collimator.

14. The display device as claimed in claim 13, characterized in that, The backlight collimator includes a first prism and a second prism stacked together, wherein the first prism is closer to the light source than the second prism, or the second prism is closer to the light source than the first prism. The first prism is used to collimate the light beam emitted from the light source in the first direction, and the second prism is used to collimate the light beam emitted from the light source in the second direction.

15. The display device as claimed in claim 14, characterized in that, The backlight collimator also includes a privacy film, which is disposed on the side of the first prism facing away from the second prism, or on the side of the second prism facing away from the first prism, or between the first prism and the second prism. The privacy film includes a plurality of gratings, which are arranged at intervals parallel to the second direction.

16. The display device as claimed in claim 12, characterized in that, The light source includes multiple LEDs arranged in an array, and the multiple LEDs are stacked with the backlight collimator. The backlight collimator includes a light-collecting lens and a diffusion film stacked together, with the light-collecting lens being closer to the light source than the diffusion film.

17. The display device as claimed in claim 16, characterized in that, The number of light-collecting lenses is multiple, and the number of light-collecting lenses is the same as the number of lamp beads, with one light-collecting lens corresponding to one lamp bead.

18. The display device as claimed in claim 16 or 17, characterized in that, The image generating element includes multiple display areas, and the LEDs located in different display areas are arranged in parallel.

19. The display device as claimed in any one of claims 12 to 18, characterized in that, The image generating element further includes a quantum dot film disposed between the backlight collimator and the light source.

20. The display device according to any one of claims 1 to 19, characterized in that, The display brightness of the image generating element is greater than 2000 nits.

21. The display device according to any one of claims 1 to 20, characterized in that, The display resolution of the image generating element is greater than or equal to 400 PPI.

22. The display device as claimed in any one of claims 1 to 21, characterized in that, The display color gamut value of the image generating element is greater than or equal to 75%.

23. The display device as claimed in any one of claims 1 to 22, characterized in that, The image generating element includes a base, a light source, and a light-transmitting panel; The seat includes a base and a peripheral sidewall, the peripheral sidewall being connected to the periphery of the base, and the peripheral sidewall and the base enclosing an accommodating space; The light source and the light-transmitting panel are stacked together. The light source and the light-transmitting panel are fixed to the base and located within the accommodating space. The light-transmitting panel is spaced apart from the surrounding sidewalls. The outer casing has a first mounting wall, the bottom wall abuts against the first mounting wall, and the opening of the accommodating space faces away from the first mounting wall; The display device also includes a plurality of locking members, all of which are located within the receiving space. The plurality of locking members are arranged at intervals along the circumference of the base. One end of each locking member is fixedly connected to the outer casing, and the other end of the locking member is connected to the base.

24. The display device as claimed in claim 23, characterized in that, The opposite end of the locking member extends into the gap between the light-transmitting panel and the peripheral sidewall, and abuts against the peripheral sidewall toward the first mounting wall.

25. The display device as claimed in any one of claims 1 to 24, characterized in that, The housing includes a first mounting wall, a second mounting wall, and a third mounting wall, wherein the first mounting wall and the second mounting wall are disposed opposite to each other, and the third mounting wall and the second mounting wall are disposed opposite to each other. The image generating element is mounted on the first mounting wall, the second mounting wall is provided with the mounting opening, the window element is mounted on the second mounting wall and covers the mounting opening, and the image magnifying element is mounted on the third mounting wall.

26. The display device as claimed in any one of claims 1 to 24, characterized in that, The housing includes a first mounting wall and a second mounting wall, wherein the first mounting wall and the second mounting wall are disposed opposite to each other. The image generating element is mounted on the first mounting wall, the second mounting wall is provided with the mounting opening, the window element is mounted on the second mounting wall and covers the mounting opening, and the image magnifying element is located between the image generating element and the window element; The image magnifying element is also used to project the image beam toward the window element through the image magnifying element.

27. A cockpit, characterized in that, Includes the display device as described in any one of claims 1 to 26.

28. A means of transportation, characterized in that, It includes a vehicle and a display device as described in any one of claims 1 to 26, the display device being mounted on the vehicle, or it includes a cockpit as described in claim 27, the cockpit being mounted on the vehicle.

Images