Display device

Abstract

The invention discloses a display device comprising a display used for emitting light of a first wave band, a second wave band and a third wave band; the light splitting structure is positioned on the light emitting side of the display and is used for partially reflecting and partially transmitting the incident light; and the narrowband reflecting layer is located on a light emitting path of the light splitting structure, and the narrowband reflecting layer is used for reflecting light of the first wave band, the second wave band and the third wave band and transmitting light of other wave bands. The narrow-band reflecting layer only reflects the light rays of the wave band emitted by the display, so that the display light rays can be emitted into human eyes as much as possible, the utilization rate of the light rays emitted by the display is improved, the brightness of a display picture observed by the human eyes is further improved, meanwhile, more ambient light rays can be emitted into the display device, and the display effect is improved. And the brightness of a real picture observed by human eyes is improved, so that the watching experience of a user is improved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a display device. Background Technology

[0002] Augmented Reality (AR) technology is a technology that integrates virtual information with the real world. AR devices project virtual images displayed on a screen into the viewer's eyes and blend them with real-world scenes, providing users with an immersive viewing experience.

[0003] Birdbath (BB) structure is a commonly used optical structure in AR devices, offering advantages such as lightweight design and ease of manufacturing. The imaging principle of the BB structure is as follows: A lens group images the display screen, magnifying and zooming the image. After reflection by a polarizing beam splitter, the image is projected onto a curved mirror in front. Then, it passes through a double-layered quarter-wave plate, causing the entire image to rotate 90°. The image is then reflected back, passing through the polarizing beam splitter a second time before finally reaching the viewer's eye. During this process, because the image passes through the polarizing beam splitter twice, the overall light efficiency loss can reach 75%-80%, and there are also issues with forward light leakage and stray light, affecting the viewing experience. Summary of the Invention

[0004] The present invention provides a display device for improving the brightness of the display screen as observed by the human eye, and reducing light leakage and stray light phenomena in the display device.

[0005] This invention provides a display device, comprising:

[0006] A display used to emit light in the first, second, and third bands;

[0007] A beam-splitting structure is located on the light-emitting side of the display. The beam-splitting structure is used to partially reflect and partially transmit incident light.

[0008] A narrowband reflective layer is located in the light output path of the beam splitter structure. The narrowband reflective layer is used to reflect light from the first, second, and third wavebands and transmit light from other wavebands.

[0009] In some embodiments of the present invention, the beam splitting structure is a narrowband beam splitting structure, which is used to transmit a portion of the light in the first, second, and third bands and reflect a portion of the light in the first, second, and third bands, and transmit light in the other bands.

[0010] In some embodiments of the present invention, the display device further includes:

[0011] A first linear polarizing layer is located between the display and the beam splitting structure, and the first linear polarizing layer is used to transmit first linearly polarized light;

[0012] A first phase delay layer is located between the beam splitting structure and the narrowband reflective layer. The first phase delay layer is used to delay the phase of the incident light by π / 2.

[0013] In some embodiments of the present invention, the display device further includes:

[0014] The second phase retardation layer is located on the side of the narrowband reflective layer opposite to the first phase retardation layer. The second phase retardation layer is used to delay the phase of the incident light by π / 2.

[0015] The second linear polarizing layer is located on the side of the second phase retardation layer away from the narrow band reflective layer. The second linear polarizing layer is used to transmit second linearly polarized light, and the polarization direction of the second linearly polarized light is perpendicular to the polarization direction of the first linearly polarized light.

[0016] In some embodiments of the present invention, the first band includes a wavelength of 462 nm, the second band includes a wavelength of 525 nm, and the third band includes a wavelength of 617 nm.

[0017] The narrowband reflective layer has a reflectivity of 90% or greater for light in the first, second, and third wavebands.

[0018] In some embodiments of the present invention, the first band includes a wavelength of 462 nm, the second band includes a wavelength of 525 nm, and the third band includes a wavelength of 617 nm.

[0019] The narrowband beam splitter structure satisfies the following relationship for the reflectivity and transmittance of light in the first, second, and third wavebands:

[0020] 0.1≤R / T≤10;

[0021] Wherein, R represents the reflectivity of the narrowband beam splitter for light in the first, second, and third bands, and T represents the transmittance of the narrowband beam splitter for light in the first, second, and third bands.

[0022] In some embodiments of the present invention, the display device further includes:

[0023] A curved mirror is located on the side of the narrow-band reflective layer 3 that is away from the beam-splitting structure.

[0024] In some embodiments of the present invention, the display device further includes:

[0025] An imaging lens assembly is located between the display and the beam splitting structure.

[0026] In some embodiments of the present invention, the beam-splitting structure includes a carrier plate and a beam-splitting film, the beam-splitting film being located on the surface of the carrier plate, and the surface of the carrier plate being a plane or a curved surface.

[0027] In some embodiments of the present invention, the display device is one of a near-eye display device, a head-up display device, or a distance display device.

[0028] The beneficial effects of this invention are as follows:

[0029] The display device provided by this invention includes: a display for emitting light in a first, second, and third wavelength band; a beam-splitting structure located on the light-emitting side of the display, which partially reflects and partially transmits incident light; and a narrow-band reflective layer located in the light-emitting path of the beam-splitting structure, which reflects the first, second, and third wavelength bands of light and transmits light in other wavelength bands. The narrow-band reflective layer reflects only the light emitted by the display, allowing as much of the displayed light as possible to enter the human eye, improving the utilization rate of the emitted light and thus increasing the brightness of the displayed image as perceived by the human eye. Simultaneously, it allows more ambient light to enter the display device, further increasing the brightness of the actual image as perceived by the human eye, thereby improving the user's viewing experience. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of an augmented reality display device in related technologies;

[0032] Figure 2 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention;

[0033] Figure 3 Functional characteristic curves of the narrowband reflective layer provided in embodiments of the present invention;

[0034] Figure 4 Functional characteristic curves of the narrowband beam splitting structure provided in the embodiments of the present invention;

[0035] Figure 5 This is a schematic diagram of the structure of another display device provided in an embodiment of the present invention;

[0036] Figure 6This is a schematic diagram of the structure of another display device provided in an embodiment of the present invention;

[0037] Explanation of reference numerals in the attached figures:

[0038] 10-Display screen, 20-First linear polarizer, 30-Lens group, 40-Polarizing beam splitter, 50-First quarter-wave plate, 60-Partially reflective and partially transmissive film, 70-Curved mirror, 80-Second quarter-wave plate, 90-Second linear polarizer, 1-Display, 2-Beam splitting structure, 3-Narrow-band reflective layer, 4-First linear polarizing layer, 5-First phase retardation layer, 6-Second phase retardation layer, 7-Second linear polarizing layer, 8-Imaging lens group, 9-Curved mirror. Detailed Implementation

[0039] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the figures denote the same or similar structures, and therefore repeated descriptions of them will be omitted. Terms describing position and direction in the present invention are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of the present invention. The accompanying drawings of the present invention are for illustrative purposes only and do not represent actual proportions.

[0040] Figure 1 This is a schematic diagram of the structure of an augmented reality display device in related technologies.

[0041] Figure 1 The optical structure of an augmented reality (AR) display device with a bird bath (BB) structure in the related technology is shown, such as Figure 1 As shown, the AR display device based on the BB structure includes a display screen 10, a first linear polarizer 20, a lens group 30, a polarizing beam splitter 40, a first quarter-wave plate 50, a partially reflective and partially transmissive film 60, a curved mirror 70, a second quarter-wave plate 80, and a second linear polarizer 90.

[0042] The first linear polarizer 20 is located on the light-emitting side of the display screen 10 and can be used to transmit first linearly polarized light; the lens group 30 is located on the light-emitting side of the first linear polarizer 20 and can be used to image the display screen 10; the polarizing beam splitter 40 is located on the light-emitting side of the lens group 30 and can be used to reflect the first linearly polarized light and reflect the second linearly polarized light, the polarization direction of the second linearly polarized light being opposite to the polarization direction of the first linearly polarized light, and the polarizing beam splitter 40 is set at a set angle, for example, an angle of 45° with the horizontal direction, so as to deflect the incident light and emit it in the desired direction; the first quarter-wave plate 50 is located on the reflected light path of the polarizing beam splitter 40; The partially reflective transmissive film 60 is located on the side of the first quarter-wave plate 50 away from the polarizing beam splitter 40. The partially reflective transmissive film 60 can be used to partially transmit and partially reflect incident light, and it can partially transmit and partially reflect light of the entire spectrum. The curved mirror 70 is located on the side of the partially reflective transmissive film 60 away from the first quarter-wave plate 50. The curved mirror 70 can be used to magnify the image. The second quarter-wave plate 80 is located on the side of the curved mirror 70 away from the partially reflective transmissive film 60. The second linear polarizer 90 is located on the side of the second quarter-wave plate 80 away from the curved mirror 70. The second linear polarizer 90 can be used to transmit second linearly polarized light.

[0043] like Figure 1 As shown, the light propagation path in an AR display device based on a BB structure is as follows:

[0044] (1) The light L1 emitted from the display screen 10 is modulated into first linearly polarized light (e.g., P light) by the first linear polarizer 20 and emitted to the lens group 30. After passing through the lens group 30, it is incident on the polarizing beam splitter 40. The polarizing beam splitter 40 reflects the first linearly polarized light to the first quarter-wave plate 50. The first quarter-wave plate 50 converts the first linearly polarized light into first circularly polarized light (e.g., left-handed circularly polarized light). The portion of the first circularly polarized light reflected by the partially reflected and partially transmitted film 60 is converted into second circularly polarized light. The rotation direction of the second circularly polarized light is opposite to that of the first circularly polarized light (e.g., right-handed circularly polarized light). The second circularly polarized light is converted into second linearly polarized light (e.g., S light) after passing through the first quarter-wave plate 50. The second linearly polarized light can be transmitted to the human eye by the polarizing beam splitter 40. The portion of the first circularly polarized light transmitted by the partially reflected and partially transmitted film 60 is converted into first linearly polarized light by the second quarter-wave plate 80. The first linearly polarized light cannot pass through the second linear polarizer 90.

[0045] (2) The external light L2 incident by the second linear polarizer 90 is modulated into second linearly polarized light. The second linearly polarized light is converted into second circularly polarized light by the second quarter-wave plate 80. The second circularly polarized light is partially transmitted by the curved mirror 70 and the partially reflective and partially transmitted film 60 and is incident on the first quarter-wave plate 50. The first quarter-wave plate 50 converts the second circularly polarized light into second linearly polarized light. The second linearly polarized light can be transmitted to the human eye by the polarizing beam splitter 40.

[0046] (3) The first linearly polarized light L3 incident by the polarizing beam splitter 40 can be reflected by the polarizing beam splitter 40 into the human eye.

[0047] As can be seen, in the AR display device based on the BB structure, the light L1 emitted from the display screen 10 passes through the partially reflective and partially transmissive film 60 twice, resulting in a loss of light efficiency. For example, when the reflectivity and transmittance of the partially reflective and partially transmissive film 60 are both 50%, only 25% of the light emitted from the display screen 10 enters the human eye, resulting in low light utilization.

[0048] On the other hand, since a quarter-wave plate is only ideal for light of a certain wavelength, for example, the display screen 10 emits red, green, and blue light, but the quarter-wave plate is only ideal for red light, meaning that only red light can be completely converted into first linearly polarized light after passing through the first quarter-wave plate 50 and the second quarter-wave plate 80, a portion of the light emitted from the display screen 10 will leak from the second linear polarizer 90. Figure 1 As shown in the diagram, light ray L10 in related technologies exhibits approximately 5% light leakage in AR display devices based on the BB structure. This light leakage may lead to user privacy breaches and affect product security. Furthermore, the light ray L3 reflected to the human eye by the polarizing beam splitter 40 is stray light, which can severely interfere with the user's viewing experience.

[0049] In view of this, embodiments of the present invention provide a display device for improving the brightness of the image that can be observed by the human eye and reducing light leakage and stray light in the display device.

[0050] Figure 2 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention.

[0051] like Figure 2 As shown, in this embodiment of the invention, the display device includes: a display 1, a beam splitting structure 2, and a narrowband reflective layer 3.

[0052] The type of display 1 can be, but is not limited to, one of the following: Liquid Crystal on Silicon (LCOS) display, Digital Light Processing (DLP) display, Organic Light-Emitting Diode (OLED) display, Liquid Crystal Display (LCD), Light-Emitting Diode (LED) display, MicroLED display, Laser Beam Scanning (LBS) display, etc.

[0053] Display 1 emits light in three wavelengths: a first wavelength, a second wavelength, and a third wavelength. For example, display 1 emits red, green, and blue light. The spectral width of each wavelength emitted by display 1 can be within 50 nm. When display 1 uses a laser light source, the spectral width of each wavelength can reach 2 nm. Therefore, it is evident that display 1 can emit a relatively narrow spectrum of light. For ease of description, the light emitted by display 1 will be referred to as display light, and the light incident on the display device from the outside will be referred to as ambient light.

[0054] The beam splitting structure 2 is located on the light-emitting side of the display 1 and is used to partially reflect and partially transmit the incident light. The part of the light reflected by the beam splitting structure 2 can be incident on the narrow band reflective layer 3.

[0055] The narrowband reflective layer 3 is located in the light output path of the beam splitting structure 2. It can be used to reflect light in the first, second and third bands and transmit light in other bands. The band of light reflected by the narrowband reflective layer 3 is consistent with the band range of light emitted from the display 1. Thus, the display light L1 can be reflected by the narrowband reflective layer 3 to the beam splitting structure 2, and the beam splitting structure 2 transmits part of it to the human eye.

[0056] The narrowband reflective layer 3 in this embodiment of the invention can be made based on the principle of thin film interference. For example, the narrowband reflective layer 3 includes multiple film layers stacked together. The refractive index and reflectivity of adjacent film layers are different. By adjusting the refractive index and reflectivity of each film layer, the wavelength range of the light reflected by the narrowband reflective layer 3 can be made consistent with the wavelength range of the light emitted from the display 1.

[0057] Figure 3 The functional characteristic curves of the narrowband reflective layer provided in the embodiments of the present invention are shown.

[0058] Figure 3The relationship between the wavelength of light incident on the narrowband reflective layer 3 and the reflectivity of the narrowband reflective layer 3 is shown, where the horizontal axis represents the wavelength of the incident light in nanometers (nm), and the vertical axis represents the reflectivity in percentages (%). Figure 3 It is known that the narrowband reflective layer 3 can achieve a reflectivity of 95% for light with dominant wavelengths of 462nm, 525nm, and 617nm. Furthermore, the narrowband reflective layer 3 exhibits high reflectivity for light within certain wavelength bands. For example, it has high reflectivity for light within a 5nm range of the aforementioned dominant wavelengths, specifically the first band being 457nm-467nm, the second band being 520nm-530nm, and the third band being 612nm-622nm. Simultaneously, the narrowband reflective layer 3 has low reflectivity for other wavelength bands, allowing light of other wavelengths to pass through it.

[0059] In this embodiment of the invention, by rationally designing the wavelength of the light emitted by the display 1 and the wavelength of the light that the narrowband reflective layer 3 can reflect, the display light can be reflected by the narrowband reflective layer 3 as much as possible, thereby increasing the amount of display light incident on the human eye, improving the utilization rate of the light emitted by the display, and thus improving the brightness of the display screen observed by the human eye.

[0060] The narrowband reflective layer 3 has a reflectivity of 90% or greater for the first, second, and third bands of light emitted from the display 1. Optionally, the narrowband reflective layer 3 has a reflectivity of 90%, 95%, or 99% for the first, second, and third bands of light emitted from the display 1.

[0061] It is understood that the term "narrowband" in this embodiment of the invention refers to the fact that only light with wavelengths within the range of light emitted by the display 1 can be reflected by the narrowband reflective layer 3. Since the spectral width of the light emitted by the display 1 is relatively narrow, correspondingly, the spectral width that the narrowband reflective layer 3 can reflect is also relatively narrow. Therefore, when ambient light is incident on the narrowband reflective layer 3, only a very small portion of the light cannot enter the display device; most of it can pass through the narrowband reflective layer 3 and the beam-splitting structure 2 to reach the human eye. This helps to increase the amount of ambient light that the human eye can receive, thereby increasing the brightness of the actual image observed by the human eye.

[0062] By setting a beam-splitting structure 2 and a narrow-band reflective layer 3, the brightness of the displayed image and the real image observed by the human eye can be improved, thereby improving the user experience. Moreover, the structure is simple, which helps to reduce production costs and manufacturing difficulty, and meets the design requirements of miniaturized display devices.

[0063] like Figure 2As shown, in this embodiment of the invention, the beam splitting structure 2 can be a narrowband beam splitting structure. The narrowband beam splitting structure 2 is used to transmit a portion of the light in the first, second, and third bands and reflect a portion of the light in the first, second, and third bands, and transmit light in other bands. The first, second, and third bands are consistent with the light bands emitted by the display 1.

[0064] In this embodiment of the invention, the light propagation path in the display device is as follows: (1) Display light L1 emitted from the display 1 is incident on the narrowband beam splitter 2. The narrowband beam splitter 2 reflects part of the display light to the narrowband reflective layer 3. This part of the light is reflected back to the narrowband beam splitter 2 by the narrowband reflective layer 3 and is partially transmitted to the human eye by the narrowband beam splitter 2. (2) Ambient light L2 incident from the narrowband reflective layer 3, except for the light of the first, second, and third bands mentioned above, can be transmitted to the narrowband beam splitter 2 and transmitted to the human eye by the narrowband beam splitter 2. (3) Ambient light L3 incident from the narrowband beam splitter 2, only the light of the first, second, and third bands mentioned above is reflected to the human eye by the narrowband beam splitter 2.

[0065] As can be seen, by setting the narrowband beam splitting structure 2 and the narrowband reflective layer 3, the present invention can increase the amount of display light and ambient light incident on the human eye, and the brightness of the real picture that the human eye can observe is doubled compared with related technologies. At the same time, it can also reduce stray light, which is beneficial to improving the user's viewing experience.

[0066] Figure 4 The functional characteristic curves of the narrowband beam splitting structure provided in the embodiments of the present invention are shown.

[0067] Figure 4 The relationship between the wavelength of light incident on the narrowband beam splitter 2 and the reflectivity of the narrowband beam splitter 2 is shown, where the horizontal axis represents the wavelength of the incident light in nanometers (nm), and the vertical axis represents the reflectivity in percentages (%). Figure 4 It is known that the narrowband beam splitter 2 has a reflectivity of approximately 50% for light with dominant wavelengths of 462nm, 525nm, and 617nm, meaning its transmittance is 50%. Furthermore, the narrowband beam splitter 2 can exhibit higher reflectivity for light within certain wavelength bands compared to other bands. For example, the narrowband beam splitter 2 has higher reflectivity for light within the aforementioned wavelength ±5nm range, specifically the first band being 457nm-467nm, the second band being 520nm-530nm, and the third band being 612nm-622nm. Simultaneously, the narrowband beam splitter 2 has lower reflectivity for light in other wavelength bands, allowing light from those bands to pass through.

[0068] The narrowband beam-splitting structure 2 can also be fabricated based on the principle of thin-film interference. In practical implementation, by rationally designing the wavelength of the light emitted from the display 1 and the wavelength of the light partially reflected and partially transmitted by the narrowband beam-splitting structure 2, the two can be made consistent, which can greatly improve the brightness of the displayed image and the real image that can be observed by the human eye, while reducing stray light. For example, the beam-splitting structure 2 may include a carrier plate and a beam-splitting film. The beam-splitting film is located on the surface of the carrier plate and is fabricated based on the principle of thin-film interference. The surface of the carrier plate can be flat or curved, thereby meeting the imaging requirements.

[0069] For example, the reflectivity and transmittance of the narrowband beam splitter 2 for light in the first, second, and third bands satisfy the following relationship:

[0070] 0.1≤R / T≤10;

[0071] Where R represents the reflectivity of the narrowband beam splitter 2 for light in the first, second, and third bands, and T represents the transmittance of the narrowband beam splitter 2 for light in the first, second, and third bands. By adjusting the R / T ratio, the brightness ratio between the displayed image and the real image incident on the human eye can be adjusted, making the two images blend more harmoniously and improving the user experience.

[0072] Figure 5 This is a schematic diagram of another display device provided in an embodiment of the present invention.

[0073] like Figure 5 The display device shown is, and Figure 2 The difference in the display device shown is that it further includes a first linear polarizing layer 4 and a first phase retardation layer 5. The first linear polarizing layer 4 is located between the display 1 and the beam splitting structure 2, and can be used to transmit first linearly polarized light. The first phase retardation layer 5 is located between the beam splitting structure 2 and the narrowband reflective layer 3, and can be used to delay the phase of the incident light by π / 2. For example, the first phase retardation layer 5 can be a quarter-wave plate. The first phase retardation layer 5 can be spaced apart from the narrowband reflective layer 3, or the first phase retardation layer 5 can be attached to the side of the narrowband reflective layer 3 facing the beam splitting structure 2, or the first phase retardation layer 5 can be formed on the side of the narrowband reflective layer 3 facing the beam splitting structure 2 through a coating process.

[0074] In this embodiment of the invention, the display light L1 emitted from the display 1 is incident on the first linear polarizing layer 4, modulated into first linearly polarized light by the first linear polarizing layer 4, and incident on the narrowband beam splitter 2. The narrowband beam splitter 2 reflects a portion of the first linearly polarized light to the first phase retardation layer 5. The first phase retardation layer 5 can convert this portion of the first linearly polarized light into first circularly polarized light. Since the narrowband reflective layer 3 has no selectivity for the polarization state of the light, all the first circularly polarized light can be reflected by the narrowband reflective layer 3 and converted into second circularly polarized light. The second circularly polarized light is then converted into second linearly polarized light by the first phase retardation layer 5. Furthermore, since the narrowband beam splitter 2 has no selectivity for the polarization state of the light, the second linearly polarized light can be partially transmitted to the human eye by the narrowband beam splitter 2. The ambient light incident through the narrowband reflective layer 3 is natural light, and the addition of the first phase retardation layer 5 has little impact on the ambient light. The ambient light incident through the beam splitter 2 does not pass through the first phase retardation layer 5.

[0075] Therefore, in this embodiment of the invention, since the narrowband reflective layer 3 and the narrowband beam splitter 2 are not selective for the polarization state of the incident light, even if a phase retardation layer is provided in the display device, the problem of incomplete polarization state conversion of the polarized light will not occur. Furthermore, the narrowband reflective layer 3 has a high reflectivity for the display light, which can greatly reduce the leakage of display light from the display device, solving the problem of forward light leakage in related technologies. No one other than the user can observe the display screen, ensuring user privacy. In this embodiment of the invention, forward light leakage can be controlled to within 1%.

[0076] Figure 6 This is a schematic diagram of another display device provided in an embodiment of the present invention.

[0077] like Figure 6 The display device shown is, and Figure 5 The difference in the display device shown is that it further includes a second phase retardation layer 6 and a second linear polarizing layer 7. The second phase retardation layer 6 is located on the side of the narrowband reflective layer 3 opposite to the first phase retardation layer 5, and can be used to delay the phase of the incident light by π / 2. For example, the second phase retardation layer 6 can be a quarter-wave plate. The second linear polarizing layer 7 is located on the side of the second phase retardation layer 6 opposite to the narrowband reflective layer 3, and can be used to transmit second linearly polarized light.

[0078] Due to process limitations, the reflectivity of the narrowband reflective layer 3 is difficult to achieve 100%. Some display light may be emitted from the narrowband reflective layer 3. This part of the display light is emitted from the narrowband reflective layer 3 in the form of first circularly polarized light. After passing through the second phase retardation layer 6, it is converted into first linearly polarized light. The first linearly polarized light cannot be emitted from the second linear polarizer 7, thereby further avoiding the problem of forward light leakage.

[0079] like Figure 2 , Figure 5 and Figure 6 As shown, in this embodiment of the invention, the display device further includes an imaging lens group 8, which is located between the display 1 and the beam splitting structure 2, and is used to image the display screen of the display 1. The imaging lens group 8 may include at least one lens. The surface parameters such as the radius of curvature, thickness, and diopter of each lens, as well as the spacing and relative position of the lenses, can be obtained by optical design according to specific requirements. This embodiment of the invention does not limit these parameters.

[0080] In this embodiment of the invention, the display device further includes a curved mirror 9. The curved mirror 9 is located on the side of the narrow-band reflective layer 3 opposite to the beam-splitting structure 2. It can be used to magnify and focus the image, so that the displayed image is projected at a position that is comfortable for the human eye to view, thereby improving the imaging effect. The curved mirror 9 can be made of a material with high transmittance. Its radius of curvature and size parameters can be obtained by optical design according to specific needs, and this embodiment of the invention does not limit this. For example, the surface of the curved mirror 9 can be a spherical surface or a freeform surface.

[0081] For example, in such Figure 6 In the display device shown, the narrowband reflective layer 3 can be formed on the surface of the curved mirror 9 facing the beam splitter 2 by a coating process; the second phase retardation layer 6 can be spaced apart from the curved mirror 9, or the second phase retardation layer 6 can be attached to the side of the curved mirror 9 away from the narrowband reflective layer 3, or the second phase retardation layer 6 can be formed on the side of the curved mirror 9 away from the narrowband reflective layer 3 by a coating process; the second linear polarizing layer 7 can be spaced apart from the second phase retardation layer 6, or the second linear polarizing layer 7 can be attached to the side of the second phase retardation layer 6 away from the curved mirror 9, or the second linear polarizing layer 7 can be formed on the side of the second phase retardation layer 6 away from the curved mirror 9 by a coating process. The arrangement of each film layer in the display device can be determined according to specific needs, and this embodiment of the invention does not limit it.

[0082] In summary, the display device provided by this invention is based on AR technology and requires imaging the displayed image of the display 1 onto the real environment, enabling the user to simultaneously observe the displayed image and the real-world image. In specific implementations, the design concept of the display device provided in this embodiment can be adopted whenever the above requirements are met. This involves setting a narrow-band reflective layer 3 and a beam-splitting structure 2 to improve the brightness of both the displayed image and the real-world image observable by the human eye. For example, the display device provided by this invention can be any of, but not limited to, a near-eye display device, a head-up display device, or a distance display device.

[0083] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0084] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A display device, characterized in that, include: A display used to emit light in the first, second, and third bands; A beam-splitting structure is located on the light-emitting side of the display. The beam-splitting structure is used to partially reflect and partially transmit incident light. A narrowband reflective layer is located in the light output path of the beam splitter structure. The narrowband reflective layer is used to reflect light from the first, second, and third wavebands and transmit light from other wavebands.

2. The display device as claimed in claim 1, characterized in that, The beam splitting structure is a narrowband beam splitting structure, which is used to transmit a portion of the light in the first, second, and third wavebands and reflect a portion of the light in the first, second, and third wavebands, while transmitting light in the other wavebands.

3. The display device as claimed in claim 1, characterized in that, The display device further includes: A first linear polarizing layer is located between the display and the beam splitting structure, and the first linear polarizing layer is used to transmit first linearly polarized light; A first phase delay layer is located between the beam splitting structure and the narrowband reflective layer. The first phase delay layer is used to delay the phase of the incident light by π / 2.

4. The display device as claimed in claim 3, characterized in that, The display device further includes: The second phase retardation layer is located on the side of the narrowband reflective layer opposite to the first phase retardation layer. The second phase retardation layer is used to delay the phase of the incident light by π / 2. The second linear polarizing layer is located on the side of the second phase retardation layer away from the narrow band reflective layer. The second linear polarizing layer is used to transmit second linearly polarized light, and the polarization direction of the second linearly polarized light is perpendicular to the polarization direction of the first linearly polarized light.

5. The display device according to any one of claims 1-4, characterized in that, The first band includes a wavelength of 462nm, the second band includes a wavelength of 525nm, and the third band includes a wavelength of 617nm. The narrowband reflective layer has a reflectivity of 90% or greater for light in the first, second, and third wavebands.

6. The display device according to any one of claims 2-4, characterized in that, The first band includes a wavelength of 462nm, the second band includes a wavelength of 525nm, and the third band includes a wavelength of 617nm. The narrowband beam splitter structure satisfies the following relationship for the reflectivity and transmittance of light in the first, second, and third wavebands: 0.1≤R / T≤10; Wherein, R represents the reflectivity of the narrowband beam splitter for light in the first, second, and third bands, and T represents the transmittance of the narrowband beam splitter for light in the first, second, and third bands.

7. The display device according to any one of claims 1-4, characterized in that, The display device further includes: A curved mirror is located on the side of the narrow-band reflective layer that is away from the beam-splitting structure.

8. The display device according to any one of claims 1-4, characterized in that, The display device further includes: An imaging lens assembly is located between the display and the beam splitting structure.

9. The display device according to any one of claims 1-4, characterized in that, The beam-splitting structure includes a carrier plate and a beam-splitting film. The beam-splitting film is located on the surface of the carrier plate, and the surface of the carrier plate is either flat or curved.

10. The display device according to any one of claims 1-4, characterized in that, The display device is one of a near-eye display device, a head-up display device, or a distance display device.

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