Display device and near-eye display equipment

Abstract

The embodiments of the present disclosure disclose a display device and a near-eye display apparatus. The display device includes three lens modules, which are used to transmit light of different wavelength bands; an optical waveguide, on which is provided an out-coupling region and three in-coupling regions, which are arranged in a one-to-one correspondence with the three lens modules, wherein one in-coupling region has a diffraction structure that matches the wavelength band of the transmitted light of the corresponding lens module.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the field of near-eye display technology. More specifically, the embodiments of the present disclosure relate to a display device and a near-eye display apparatus. Background Art

[0002] Currently, common optical engines include the following: DMD (Digital Micromirror Device) optical engines, LCOS (Liquid Crystal On Silicon) optical engines, LBS (Laser Beam Scanning) optical engines, and uLED (Ultra-LED) optical engines. Among them, uLED optical engines are widely used in AR glasses due to their high contrast and compact size.

[0003] In the related art, most uLED light machines can only display a single color on a single light-emitting panel, for example, single green or single amber, which results in the existing uLED being able to only realize the information prompt function. However, in order to provide full-color functions such as game audio and video, it is necessary to integrate the RGB three-color light-emitting panel (panel) on a uLED light machine, thereby realizing full-color AR glasses. Existing full-color AR glasses are usually provided with a color-combining prism, and the RGB three-color light-emitting panels are respectively arranged in three directions of the color-combining prism, and the color-combining prism is formed by gluing four right-angle prisms, and different gluing surfaces are coated with film layers of different wavelengths, so that the RGB three-color light emitted by the RGB three-color light-emitting panel is combined into white light and transmitted to the imaging lens, and then projected into the optical waveguide (WG) by the imaging lens.

[0004] However, existing uLED light engines require a color-combining prism to achieve full color, which increases the size of the uLED light engine and, in turn, the bulk of the AR glasses, impacting the user experience and failing to meet the design requirements of miniaturization and portability for existing AR glasses. Furthermore, since the color-combining prism requires coating to combine the RGB light, the transmittance and reflectivity of the coating cannot reach 100%, resulting in low light utilization. Furthermore, the color-combining prism is difficult and costly to manufacture. Summary of the Invention

[0005] The purpose of the embodiments of the present disclosure is to provide a display device and a near-eye display apparatus.

[0006] According to a first aspect of the present disclosure, there is provided a display device, three lens modules, wherein the three lens modules are used to transmit light of different wavelength bands;

[0007] An optical waveguide is provided with an outcoupling region and three incoupling regions, the three incoupling regions are arranged in a one-to-one correspondence with the three lens modules, wherein one incoupling region has a diffraction structure that matches the wavelength band of the transmission light of the corresponding lens module.

[0008] Optionally, the three lens modules all include a first lens group and a second lens group, the first lens group is closer to one side of the optical waveguide, and the settings of the first lens groups of the three lens modules are exactly the same.

[0009] Optionally, the first lens group includes, in order from the optical waveguide side, a first lens and a second lens with positive optical power and a third lens with negative optical power.

[0010] Optionally, the first mirror group includes three spherical mirrors, and the second mirror group includes one spherical mirror.

[0011] Optionally, the second lens groups of the three lens modules are all positive power lens groups.

[0012] Optionally, the three lens modules are used to transmit light in the red light band, the blue light band and the green light band respectively;

[0013] Among them, the air gap between the second lens group and the first lens group of the lens module for transmitting light in the red light band among the three lens modules is the smallest; the air gap between the second lens group and the first lens group of the lens module for transmitting light in the blue light band among the three lens modules is the largest.

[0014] Optionally, the three lens modules are used to transmit light in the red light band, the blue light band and the green light band respectively;

[0015] Among them, the thickness of the second lens group of the lens module for transmitting light in the red light band is the largest among the three lens modules; the thickness of the second lens group of the lens module for transmitting light in the blue light band is the smallest among the three lens modules.

[0016] Optionally, the overall optical focal length of each of the three lens modules is positive.

[0017] Optionally, the total optical length of each of the three lens modules is 8 mm to 8.4 mm.

[0018] According to a second aspect of the present disclosure, a near-eye display device is provided, comprising the display device according to the first aspect of the present disclosure.

[0019] According to an embodiment of the present application, a display device is provided. By providing three lens modules for transmitting light of different wavelength bands, the display device does not require a color-combining prism, can achieve full-color functionality, can reduce the size of the display device, and is conducive to the miniaturization and portability of the display device. In addition, the embodiment of the present application does not require a color-combining prism, which can avoid the attenuation of light transmission efficiency caused by the coating of the color-combining prism, and can increase the luminous flux and improve the light transmission efficiency. Furthermore, three coupling-in regions are provided for the three lens modules. In this way, the diffraction structure can be designed separately for different wavelength bands, so as to further improve the utilization rate of the RGB three-color light while ensuring a high MTF, thereby improving the display performance of the display device. In addition, the cost of the display device can also be reduced.

[0020] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly describes the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope of the present invention. Those skilled in the art can also derive other relevant drawings based on these drawings without inventive effort.

[0022] Figure 1 It is a structural schematic diagram of a display device in the prior art;

[0023] Figure 2 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;

[0024] Figure 3 This is one of the side views of the optical waveguide in the display device according to the embodiment of the present disclosure;

[0025] Figure 4 This is a second side view of the optical waveguide in the display device according to an embodiment of the present disclosure;

[0026] Figure 5 The third side view of the optical waveguide in the display device according to the embodiment of the present disclosure;

[0027] Figure 6 This is one of the structural schematic diagrams of the lens module in the display device according to an embodiment of the present disclosure;

[0028] Figure 7 This is a second structural diagram of a lens module in a display device according to an embodiment of the present disclosure;

[0029] Figure 8 This is the third structural schematic diagram of the lens module in the display device according to the embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0031] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0032] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0033] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0034] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0035] Currently, common optical engines include the following: DMD (Digital Micromirror Device) optical engines, LCOS (Liquid Crystal On Silicon) optical engines, LBS (Laser Beam Scanning) optical engines, and uLED (Ultra-LED) optical engines. Among them, uLED optical engines are widely used in AR glasses due to their high contrast and compact size.

[0036] In the prior art, uLED light engines can only display a single color on a single light panel, such as green or amber. This means that existing uLEDs can only be used for information prompts. However, to provide full-color functions such as gaming and audio and video, it is necessary to integrate three RGB color light panels into a single uLED light engine to achieve full-color AR glasses.

[0037] For example, Figure 1As shown, existing full-color AR glasses are usually equipped with a color-combining prism (X-cube) 11. The RGB light-emitting panels (R panel, G panel, and B panel) are respectively arranged in three directions of the color-combining prism 11. In addition, the color-combining prism 11 is formed by gluing four right-angle prisms together, and different gluing surfaces are coated with film layers of different wavelengths. This allows the RGB light emitted by the RGB light-emitting panels (R panel, G panel, and B panel) to be combined into white light, which is then transmitted to the imaging lens 12 and then projected by the imaging lens 12 into the optical waveguide (WG) 13. However, the existing uLED light engine requires the color-combining prism (X-cube) 11 to achieve full-color function, which results in an increase in the size of the uLED light engine, and thus in a larger size of the AR glasses, affecting the user experience and not meeting the design requirements of existing AR glasses for miniaturization and portability. Furthermore, since the color-combining prism requires coating to combine the three colors of RGB light, the transmittance and reflectivity of the coating layer of the color-combining prism cannot reach 100%, resulting in low light utilization. In addition, the color-combining prism is difficult to manufacture and is costly.

[0038] To address the aforementioned issues, the presently disclosed embodiments propose a display device that achieves full color by employing three lens modules for transmitting light of different wavelengths. Furthermore, the optical waveguide comprises three coupling regions corresponding to the three lens modules, thereby increasing luminous flux and improving light utilization, thereby enhancing display performance. Furthermore, by eliminating the need for a color-combining prism, the display device can be reduced in size, thereby reducing the size of near-eye display devices and improving the user experience.

[0039] Hereinafter, various embodiments and examples according to the present disclosure are described with reference to the accompanying drawings.

[0040] See Figure 2 An embodiment of the present application provides a display device, which includes three lens modules and an optical waveguide 22. The three lens modules are used to transmit light of different wavelength bands. The optical waveguide 22 is provided with an out-coupling area 221 and three in-coupling areas 222. The three in-coupling areas 222 are arranged in a one-to-one correspondence with the three lens modules, wherein one in-coupling area 222 has a diffraction structure that matches the wavelength band of the transmitted light of the corresponding lens module.

[0041] In some embodiments, three lens modules are used to transmit light in the red, green, and blue wavelength bands. Specifically, the three lens modules are respectively configured to transmit light in the red wavelength band, the green wavelength band, and the blue wavelength band. To this end, the three coupling-in regions 222 on the optical waveguide 22 correspond to the three lens modules. Specifically, the three coupling-in regions 222 are respectively configured to have a diffractive structure that matches the red wavelength band, a diffractive structure that matches the green wavelength band, and a diffractive structure that matches the blue wavelength band.

[0042] For example, please see Figure 2 The three lens modules are the first lens module 21a, the second lens module 21b and the third lens module 21c. The first lens module 21a can be used to transmit light in the red light band; the second lens module 21b can be used to transmit light in the green light band; and the third lens module 21c can be used to transmit light in the blue light band. Figures 3 to 5 Three coupling-in areas are set on the optical waveguide 22, namely the first coupling-in area 222a corresponding to the first lens module 21a, the second coupling-in area 222b corresponding to the second lens module 21b, and the third coupling-in area 222c corresponding to the third lens module 21c, that is, the coupling-in area 222a corresponding to the red light band, the coupling-in area 222b corresponding to the green light band, and the coupling-in area 222c corresponding to the blue light band. In this embodiment, the first lens module 21a outputs light in the red light band, which enters the optical waveguide from the first coupling-in area 222a and is transmitted to the outcoupling area 221 after total reflection and diffraction. The second lens module 21b outputs light in the green light band, which enters the optical waveguide from the second coupling-in area 222b and is transmitted to the outcoupling area 221 after total reflection and diffraction. The third lens module 21c outputs light in the blue light band, which enters the optical waveguide from the third coupling-in area 222c and is transmitted to the outcoupling area 221 after total reflection and diffraction. The light in the red light band, the light in the green light band, and the light in the blue light band emitted from the outcoupling area 221 are combined and output.

[0043] According to an embodiment of the present application, a display device is provided. By providing three lens modules for transmitting light of different wavelength bands, the display device does not require a color-combining prism, can achieve full-color functionality, can reduce the size of the display device, and is conducive to the miniaturization and portability of the display device. In addition, the embodiment of the present application does not require a color-combining prism, which can avoid the attenuation of light transmission efficiency caused by the coating of the color-combining prism, and can increase the luminous flux and improve the light transmission efficiency. Furthermore, three coupling-in regions are provided for the three lens modules. In this way, the diffraction structure can be designed separately for different wavelength bands, so as to further improve the utilization rate of the RGB three-color light while ensuring a high MTF, thereby improving the display performance of the display device. In addition, the cost of the display device can also be reduced.

[0044] In some embodiments, the distribution of the three coupling-in regions can be configured according to actual needs.

[0045] For example, see Figure 3 and Figure 4 The three in-coupling regions are arranged on one side of the out-coupling region, and the three in-coupling regions are arranged in sequence. That is, the first in-coupling region 222a (the in-coupling region corresponding to the red light band), the second in-coupling region 222b (the in-coupling region corresponding to the green light band), and the third in-coupling region 222c (the in-coupling region corresponding to the blue light band) are arranged in sequence.

[0046] For example, see Figure 5 The three incoupling regions are arranged on one side of the outcoupling region, and the three incoupling regions are arranged in a ring. In other words, the first incoupling region 222a (the incoupling region corresponding to the red light band), the second incoupling region 222b (the incoupling region corresponding to the green light band), and the third incoupling region 222c (the incoupling region corresponding to the blue light band) are arranged in a ring.

[0047] In this embodiment, since there is no need to set up a color combining prism for color combining, the layout of the out-coupling area and the three coupling-in areas on the three lens modules and the optical waveguide can be adjusted according to design requirements such as the usage scenario of the display device. The layout is more flexible and can further reduce the size of the display device.

[0048] In some embodiments, the three lens modules all include a first lens group and a second lens group, the first lens group is closer to one side of the optical waveguide, and the settings of the first lens groups of the three lens modules are exactly the same.

[0049] In some embodiments, the first lens group includes, from the optical waveguide side, a first lens and a second lens with positive optical power, and a third lens with negative optical power.

[0050] Please continue to see Figure 2The first lens module 21a, the second lens module 21b, and the third lens module 21c all include a first lens group and a second lens group. For any one of the first lens module 21a, the second lens module 21b, and the third lens module 21c, the first lens group includes, in order from the optical waveguide side, a first lens, a second lens, and a third lens.

[0051] For example, please see Figure 2 The three lens modules are the first lens module 21a, the second lens module 21b and the third lens module 21c. Among them, the first lens module 21a includes lens G11 (first lens), lens G21 (second lens), lens G31 (third lens) and lens G41 (second lens group) in sequence from the optical waveguide side; the second lens module 21b includes lens G12 (first lens), lens G22 (second lens), lens G32 (third lens) and lens G42 (second lens group) in sequence from the optical waveguide side; the third lens module 21c includes lens G13 (first lens), lens G23 (second lens), lens G33 (third lens) and lens G43 (second lens group) in sequence from the optical waveguide side. It can be understood that a spacer ring is set between two adjacent lenses, that is, a spacer ring is set between the first lens and the second lens, a spacer ring is set between the second lens and the third lens, and a spacer ring is set between the third lens and the fourth lens.

[0052] In some embodiments, the second lens groups of the three lens modules are configured differently. That is, the three lens modules are respectively used to transmit light of different wavelength bands, and different second lens groups are configured for lens modules that transmit light of different wavelength bands.

[0053] In some embodiments, the three lens modules are respectively used to transmit light in the red light band, the blue light band, and the green light band; among the three lens modules, the air gap between the second lens group and the first lens group of the lens module used to transmit light in the red light band is the smallest; and the air gap between the second lens group and the first lens group of the lens module used to transmit light in the blue light band is the largest.

[0054] For example, in the first lens module 21a (the lens module that transmits light in the red light band), the air gap between lens G41 (the second lens group) and lens G31 (the third lens) is 1.625mm to 1.655mm. In the second lens module 21b (the lens module that transmits light in the green light band), the air gap between lens G42 (the second lens group) and lens G32 (the third lens) is 1.715mm to 1.735mm. In the third lens module 21c (the lens module that transmits light in the green light band), the air gap between lens G43 (the second lens group) and lens G33 (the third lens) is 1.735mm to 1.755mm.

[0055] In some embodiments, the three lens modules are respectively used to transmit light in the red light band, the blue light band, and the green light band; among the three lens modules, the thickness of the second lens group of the lens module used to transmit light in the red light band is the largest; and the thickness of the second lens group of the lens module used to transmit light in the blue light band is the smallest.

[0056] For example, in the first lens module 21a (the lens module that transmits light in the red wavelength band), the thickness of lens G41 (the second lens group) is 1.315mm to 1.325mm. In the second lens module 21b (the lens module that transmits light in the green wavelength band), the thickness of lens G42 (the second lens group) is 1.276mm to 1.279mm. In the third lens module 21c (the lens module that transmits light in the green wavelength band), the thickness of lens G43 (the second lens group) is 1.276mm to 1.279mm.

[0057] In this embodiment, the thickness of the second lens group and the air gap between the second lens group and the first lens group are different for the lens module that transmits light in the red wavelength band (first lens module 21a), the lens module that transmits light in the green wavelength band (second lens module 21b), and the lens module that transmits light in the blue wavelength band (third lens module 21c). This ensures that light in different wavelength bands has a high MTF.

[0058] In some embodiments, the second lens groups of the three lens modules are all positive power lens groups. Figure 2 The focal power of lens G41 (second lens group) of the first lens module 21a (the lens module that transmits light in the red light band) is positive. The focal power of lens G42 (second lens group) of the second lens module 21b (the lens module that transmits light in the green light band) is positive. The focal power of lens G42 (second lens group) of the third lens module 21c (the lens module that transmits light in the blue light band) is positive.

[0059] Optionally, the second lens group includes a biconvex lens. For example, please continue to refer to Figure 2 The lens G41 (second lens group) of the first lens module 21a (lens module for transmitting light in the red light band), the lens G42 (second lens group) of the second lens module 21b (lens module for transmitting light in the green light band), and the lens G42 (second lens group) of the third lens module 21c (lens module for transmitting light in the blue light band) are all double convex lenses.

[0060] In some embodiments, the focal lengths of the first lens module 21a, the second lens module 21b, and the second lens group in the third lens module 21c are all within a range of 3.4 mm to 3.7 mm. That is, the focal lengths of the lenses G41, G42, and G43 are all within a range of 3.4 mm to 3.7 mm.

[0061] In this embodiment, the first lens groups of the three lens modules are configured identically. It is understood that the surface shape of the lenses in the first lens group, the air spacing between two adjacent lenses, the optical power of the lenses, and the focal length range of the lenses are all identical.

[0062] The parameters of the first lens group are described in detail below.

[0063] In some embodiments, the lenses in the first lens group have the same surface shape, and the air spacing between two adjacent lenses in the first lens group is the same.

[0064] That is to say, the surface shapes of lens G11, lens G12, and lens G13 are consistent, and the air gap between lens G11 and lens G21, the air gap between lens G12 and lens G22, and the air gap between lens G13 and lens G23 are consistent; the surface shapes of lens G21, lens G22, and lens G23 are consistent, and the air gap between lens G21 and lens G31, the air gap between lens G22 and lens G32, and the air gap between lens G23 and lens G33 are consistent.

[0065] In some embodiments, the first lens and the second lens in the first lens group have positive refractive power, and the third lens has negative refractive power.

[0066] For example, in the first lens module 21a, the optical focal power of lens G11 (first lens) and lens G21 (second lens) of the first lens group is positive, and the optical focal power of lens G31 (third lens) of the first lens group is negative. In the second lens module 21b, the optical focal power of lens G12 (first lens) and lens G22 (second lens) of the first lens group is positive, and the optical focal power of lens G32 (third lens) of the first lens group is negative. In the third lens module 21c, the optical focal power of lens G13 (first lens) and lens G23 (second lens) of the first lens group is positive, and the optical focal power of lens G33 (third lens) of the first lens group is negative.

[0067] Optionally, the first lens in the first lens group is a biconvex lens, and the second lens and the third lens in the first lens group are both meniscus lenses that are curved to the right. For example, in the first lens module 21a, the lens G11 (first lens) of the first lens group is a biconvex lens, and the lens G21 (second lens) and the lens G31 (third lens) of the first lens group are both meniscus lenses that are curved to the right. In the second lens module 21b, the lens G12 (first lens) of the first lens group is a biconvex lens, and the lens G22 (second lens) and the lens G32 (third lens) of the first lens group are both meniscus lenses that are curved to the right. In the third lens module 21c, the lens G13 (first lens) of the first lens group is a biconvex lens, and the lens G23 (second lens) and the lens G33 (third lens) of the first lens group are both meniscus lenses that are curved to the right.

[0068] In some embodiments, the focal lengths of the lenses in the first lens group are all within the same range. Optionally, the focal lengths of the first lenses in the first lens module 21a, the second lens module 21b, and the third lens module 21c are within a range of 6.1 mm to 6.3 mm. That is, the focal lengths of lenses G11, G12, and G13 are all within a range of 6.1 mm to 6.3 mm. The focal lengths of the second lenses in the first lens module 21a, the second lens module 21b, and the third lens module 21c are all within a range of 33 mm to 35 mm. That is, the focal lengths of lenses G21, G22, and G23 are all within a range of 33 mm to 35 mm. The focal lengths of the third lenses in the first lens module 21a, the second lens module 21b, and the third lens module 21c are all within a range of -2.5 mm to -2.4 mm. That is, the focal lengths of lenses G31, G32, and G33 are all within a range of -2.5 mm to -2.4 mm.

[0069] In this embodiment, for lens modules transmitting light of different wavelengths, the first, second, and third lenses of the first lens group have consistent lens parameters, while the lens parameters of the second lens group differ. Specifically, the thickness of the second lens group and the air gap between the second lens group and the first lens group differ. This ensures that light of different wavelengths has a high MTF, thereby ensuring high MTF for all three colors of RGB light. Furthermore, for lens modules transmitting light of different wavelengths, only spacer rings of different sizes need to be designed for the first and second lens groups, while all three lens modules can use the same lens barrel size, significantly reducing manufacturing difficulty and costs.

[0070] In some embodiments, each of the three lens modules includes a light-emitting panel, which is located on the side of the second lens assembly facing away from the first lens assembly. Optionally, the three lens modules are configured to transmit light of different wavelengths, and different light-emitting panels are provided for lens modules transmitting light of different wavelengths.

[0071] For example, please see Figure 2 The three lens modules are respectively a first lens module 21a, a second lens module 21b, and a third lens module 21c. The first lens module 21a further comprises a red light emitting panel R panel, which is disposed on the side of the lens G41 (second lens group) facing away from the first lens group; the second lens module 21b further comprises a green light emitting panel G panel, which is disposed on the side of the lens G42 (second lens group) facing away from the first lens group; and the third lens module 21c further comprises a blue light emitting panel B panel, which is disposed on the side of the lens G43 (second lens group) facing away from the first lens group.

[0072] Optionally, the diagonal lengths of the light-emitting panels corresponding to different bands are all 3mm to 3.5mm. For example, for the lens module that transmits light in the red light band (the first lens module 21a), the diagonal length of the light-emitting panel in the red light band is 3mm to 3.5mm. For example, for the lens module that transmits light in the green light band (the second lens module 21b), the diagonal length of the light-emitting panel in the green light band is 3mm to 3.5mm. For example, for the lens module that transmits light in the blue light band (the third lens module 21c), the diagonal length of the light-emitting panel in the blue light band is 3mm to 3.5mm.

[0073] In some embodiments, the first mirror group includes three spherical mirrors, and the second mirror group includes one spherical mirror.

[0074] For example, in the first lens module 21a, the first lens, the second lens, the third lens, and the lens G41 (second lens group) are all spherical lenses. In the second lens module 21b, the first lens, the second lens, the third lens, and the lens G42 (second lens group) are all spherical lenses. In the third lens module 21c, the first lens, the second lens, the third lens, and the lens G43 (second lens group) are all spherical lenses.

[0075] In this embodiment, since separate lens modules are provided for different wavelength bands, it can be ensured that different wavelength bands have higher MTFs. To this end, the first lens, second lens, third lens, and second lens group of each lens module can all use spherical lenses, which can further reduce the cost of the lens module and thus reduce the cost of the display device.

[0076] In some embodiments, the overall optical power of each of the three lens modules is positive.

[0077] It should be noted that optical power refers to the difference between the convergence of the image-side beam and the convergence of the object-side beam. It can be used to characterize the ability of an optical structure to polarize light. Lenses with negative optical power are generally thinner in the middle and thicker at the periphery, and are also known as concave lenses, which have the effect of diverging light. Lenses with positive optical power are generally thicker in the middle and thinner at the periphery, and are also known as convex lenses, which have the effect of converging light.

[0078] In this embodiment, by setting the surface shapes and optical focal lengths of the first lens, the second lens, the third lens, and the second lens group in the lens module, it is possible to ensure that the light emitted by the light-emitting panel converges to the human eye and eliminate chromatic aberration.

[0079] In some embodiments, the total optical length of each of the three lens modules is 8 mm to 8.4 mm. That is, the total optical length of the lens module that transmits light in the red light band (the first lens module 21 a), the lens module that transmits light in the green light band (the second lens module 21 b), and the lens module that transmits light in the blue light band (the third lens module 21 c) are all 8 mm to 8.4 mm. Moreover, the difference in the total optical length of any two lens modules among the lens module that transmits light in the red light band (the first lens module 21 a), the lens module that transmits light in the green light band (the second lens module 21 b), and the lens module that transmits light in the blue light band (the third lens module 21 c) does not exceed 1% of the total optical length.

[0080] In this embodiment, the display device can achieve full-color function by setting three lens modules for transmitting light of different bands, without setting a color-combining prism, and can reduce the size of the display device, which is conducive to the miniaturization and portability of the display device.

[0081] In some embodiments, the entrance pupil diameter of each of the three lens modules is 3.3 mm to 4.3 mm.

[0082] In this embodiment, the larger the entrance pupil diameter is, the greater the luminous flux of the lens module is, and the more difficult the design is.

[0083] The entrance pupil diameter of the lens module can be the diameter of the coupling zone corresponding to the lens module. For example, for a lens module that outputs light in the red light band (first lens module 21a), the entrance pupil diameter of the lens module can be the diameter of the first coupling zone 222a. For example, for a lens module that outputs light in the green light band (second lens module 21b), the entrance pupil diameter of the lens module can be the diameter of the second coupling zone 222b. For example, for a lens module that outputs light in the blue light band (third lens module 21c), the entrance pupil diameter of the lens module can be the diameter of the third coupling zone 222c.

[0084] In this embodiment, since separate lens modules are provided for different bands, it can be ensured that different bands have higher MTFs. Therefore, the display device provided in the embodiment of the present application can obtain a larger entrance pupil diameter without increasing the light-emitting panel, thereby enabling the lens module to have a larger luminous flux, thereby improving the performance of the display device.

[0085] In some embodiments, the viewing angle of the display device is 25° to 35°.

[0086] In this embodiment, the embodiment of the present application has a large field of view while achieving full-color function.

[0087] In order to further optimize the performance of the projection lens, three examples are used below for illustration.

[0088] Example 1

[0089] like Figure 6 As shown, the display device includes three lens modules, namely, a first lens module 21a, a second lens module 21b, and a third lens module 21c.

[0090] The first lens module 21a includes, in order from the object side to the image side along the same optical axis, lens G11, lens G21, lens G31, lens G41, and a red light-emitting panel R panel. Lenses G11 and G41 are biconvex lenses, while lenses G21 and G31 are right-curved meniscus lenses. Lenses G11, G21, and G41 have positive focal powers, while lens G31 has negative focal powers. The focal length of lens G11 ranges from 6.1mm to 6.3mm, that of lens G21 from 33mm to 35mm, that of lens G31 from -2.5mm to -2.4mm, and that of lens G41 from 3.4mm to 3.7mm. The diagonal length of the red light-emitting panel R panel is 3mm to 3.5mm.

[0091] The second lens module 21b includes, in order from the object side to the image side along the same optical axis, lens G12, lens G22, lens G32, lens G42, and a green light-emitting panel G panel. Lenses G12 and G42 are biconvex lenses, while lenses G22 and G32 are right-curved meniscus lenses. Lenses G12, G22, and G42 have positive focal powers, while lens G32 has negative focal powers. The focal length of lens G12 ranges from 6.1mm to 6.3mm, that of lens G22 from 33mm to 35mm, that of lens G32 from -2.5mm to -2.4mm, and that of lens G42 from 3.4mm to 3.7mm. The diagonal length of the green light-emitting panel G panel ranges from 3mm to 3.5mm.

[0092] The third lens module 21c includes, in order from the object side to the image side along the same optical axis, lens G13, lens G23, lens G33, lens G43, and a blue-light-band light-emitting panel B panel. Lenses G13 and G43 are both biconvex lenses, while lenses G23 and G33 are both right-curved meniscus lenses. The optical power of lenses G13, G23, and G43 is positive, while the optical power of lens G33 is negative. The focal length range of lens G13 is 6.1mm to 6.3mm, the focal length range of lens G23 is 33mm to 35mm, the focal length range of lens G33 is -2.5mm to -2.4mm, and the focal length range of lens G43 is 3.4mm to 3.7mm. The diagonal length of blue-light-band light-emitting panel B panel is 3mm to 3.5mm.

[0093] Please refer to Table 1, which contains the specific parameters of each of the above optical components. The thickness of the lens number interval position represents the distance between two adjacent optical components.

[0094] Table 1

[0095]

[0096] In this embodiment, the display device provided in this embodiment 1 can achieve the following effects: the first lens module 21a has an optical total length of 8 mm to 8.4 mm, and an entrance pupil diameter of 3.3 mm to 4.3 mm; the second lens module 21b has an optical total length of 8 mm to 8.4 mm, and an entrance pupil diameter of 3.3 mm to 4.3 mm; the third lens module 21c has an optical total length of 8 mm to 8.4 mm, and an entrance pupil diameter of 3.3 mm to 4.3 mm. The display device has a field of view of 25° to 35°.

[0097] Example 2

[0098] like Figure 7 As shown, the difference between Example 2 and Example 1 is that the parameters of the curvature radius and thickness of each lens are different.

[0099] Please refer to Table 2, which contains the specific parameters of each of the above optical components. The thickness of the lens number interval position represents the distance between two adjacent optical components.

[0100] Table 2

[0101]

[0102] In this embodiment, the display device provided in this embodiment 1 can achieve the following effects: the first lens module 21a has an optical total length of 8 mm to 8.4 mm, and an entrance pupil diameter of 3.3 mm to 4.3 mm; the second lens module 21b has an optical total length of 8 mm to 8.4 mm, and an entrance pupil diameter of 3.3 mm to 4.3 mm; the third lens module 21c has an optical total length of 8 mm to 8.4 mm, and an entrance pupil diameter of 3.3 mm to 4.3 mm. The display device has a field of view of 25° to 35°.

[0103] Example 3

[0104] like Figure 8 As shown, the difference between Example 3 and Example 1 is that the parameters of the curvature radius and thickness of each lens are different.

[0105] Please refer to Table 3, which contains the specific parameters of each of the above optical components. The thickness of the lens number interval position represents the distance between two adjacent optical components.

[0106] Table 3

[0107]

[0108] In this embodiment, the display device provided in this embodiment 1 can achieve the following effects: the first lens module 21a has an optical total length of 8 mm to 8.4 mm, and an entrance pupil diameter of 3.3 mm to 4.3 mm; the second lens module 21b has an optical total length of 8 mm to 8.4 mm, and an entrance pupil diameter of 3.3 mm to 4.3 mm; the third lens module 21c has an optical total length of 8 mm to 8.4 mm, and an entrance pupil diameter of 3.3 mm to 4.3 mm. The display device has a field of view of 25° to 35°.

[0109] An embodiment of the present application further provides a near-eye display device, which includes the display device described in the aforementioned embodiment.

[0110] The specific structure of the display device can be found in the above embodiments.

[0111] Since the near-eye display device of the present application adopts the display devices of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0112] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0113] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

[0114] While various embodiments of the present invention have been described above, the foregoing description is intended to be illustrative, non-exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of the present invention is defined by the appended claims.

Claims

1. A display device, characterized in that: include: Three lens modules, each of which is used to transmit light of different wavelengths; An optical waveguide having an outcoupling region and three incoupling regions, wherein the three incoupling regions are arranged in a one-to-one correspondence with the three lens modules, wherein one incoupling region has a diffraction structure that matches the wavelength band of the transmission light of the corresponding lens module; The three lens modules all include a first lens group and a second lens group, the first lens group is closer to the side of the optical waveguide, the settings of the first lens groups of the three lens modules are exactly the same, and the settings of the second lens groups of the three lens modules are different, the first lens group includes, from the optical waveguide side, a first lens and a second lens with positive optical focal length and a third lens with negative optical focal length, the second lens groups of the three lens modules are all positive optical focal length groups, the overall optical focal length of each lens module in the three lens modules is positive optical focal length, the focal length range of the second lens groups of the three lens modules is all 3.4mm~3.7mm, the three lens modules are respectively the first lens module, the second lens module, and the third lens module, the air gap between the second lens group and the third lens in the first lens module is 1.625mm~1.655mm, the air gap between the second lens group and the third lens in the second lens module is 1.715mm~1.735mm, and the air gap between the second lens group and the third lens in the third lens module is 1.735mm~1.755mm.

2. The display device according to claim 1, wherein The first mirror group includes three spherical mirrors, and the second mirror group includes one spherical mirror.

3. The display device according to claim 1, wherein The three lens modules are used to transmit light in the red light band, the blue light band and the green light band respectively; Among them, the air gap between the second lens group and the first lens group of the lens module for transmitting light in the red light band among the three lens modules is the smallest; the air gap between the second lens group and the first lens group of the lens module for transmitting light in the blue light band among the three lens modules is the largest.

4. The display device according to claim 1, wherein The three lens modules are used to transmit light in the red light band, the blue light band and the green light band respectively; Among them, the thickness of the second lens group of the lens module for transmitting light in the red light band is the largest among the three lens modules; the thickness of the second lens group of the lens module for transmitting light in the blue light band is the smallest among the three lens modules.

5. The display device according to claim 1, wherein The total optical length of each of the three lens modules is 8 mm to 8.4 mm.

6. A near-eye display device, characterized in that: include: The display device according to any one of claims 1 to 5.

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