Optical waveguide lens and near-eye display device

Abstract

The present invention provides a light guide lens and a near-eye display device. [Solution] The near-eye display device includes a housing, a projection device attached to the housing, and a light guide lens attached to the housing for forming an image generated by the projection device in front of a human eye. The light guide lens includes a waveguide sheet stacked along a thickness direction of the light guide lens, a first air gap is formed between adjacent light guide sheets along the thickness direction of the light guide lens, and a filling member is provided in the first air gap for filling at least a part of the first air gap, thereby reducing the risk of minute impurities such as water vapor and dust in the external environment entering the first air gap, improving the imaging effect and imaging stability of the light guide lens and helping to extend the service life of the light guide lens, improving the operation stability and service life of the near-eye display device, and contributing to improving the user's experience.

Description

[Technical field]

[0001] The present invention relates to the technical field of near-eye display devices, and in particular to a light guide lens and a near-eye display device. [Background technology]

[0002] The near-eye display device includes a projection device and an optical waveguide lens, and the optical waveguide lens forms an image generated by the projection device in front of the human eye by reflection and diffraction of light rays.

[0003] A conventional optical waveguide lens includes a plurality of optical waveguide sheets arranged in a stack, and has an air gap between adjacent optical waveguide sheets so as to realize total reflection of light rays in the lens body of the optical waveguide lens and improve the imaging effect. During the process of using, storing, carrying, transporting, etc. of the near-eye display device, minute impurities such as water vapor and dust in the external environment are likely to enter the air gap, resulting in a deterioration of the imaging effect of the optical waveguide lens.

[0004] Therefore, there is a need to provide a light guide lens and a near-eye display device with stable imaging effect. Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide an optical waveguide lens and a near-eye display device that have a stable imaging effect. [Means for solving the problem]

[0006] The technical ideas of the present invention are as follows:

[0007] In a first aspect of the present application, there is provided an optical waveguide lens comprising waveguide sheets, the number of which is at least two, the optical waveguide sheets being stacked along a thickness direction of the optical waveguide lens, adjacent optical waveguide sheets being fixedly connected, a first air gap being present between adjacent optical waveguide sheets along the thickness direction of the optical waveguide lens, and a filling member being provided within the first air gap for filling at least a portion of the first air gap.

[0008] In some embodiments, the filler member is an optically transparent member, and the refractive index of the filler member is less than or equal to 1.3.

[0009] In some embodiments, the refractive index of the filler material is greater than or equal to 1.2.

[0010] In some embodiments, the filler member is a transparent adhesive, and adjacent optical waveguide sheets are fixedly connected with the filler member.

[0011] In some embodiments, the light guide sheet comprises a lens body and a raster structure disposed on the lens body, and along the thickness direction of the light guide lens, the height of the first air gap is greater than the height of the raster structure protruding from the lens body.

[0012] In some embodiments, the light guide lens further comprises a cover plate, the cover plate being fixedly connected to the light guide sheet, and the cover plate being located on one or both sides of the light guide sheet along the thickness direction of the light guide lens.

[0013] In some embodiments, a second air gap is present between the cover plate and the light guide sheet along a thickness direction of the light guide lens, and a filler member is provided within the second air gap to fill at least a portion of the second air gap.

[0014] In some embodiments, the light guide sheet comprises a lens body and a raster structure provided on the lens body, and along the thickness direction of the light guide lens, the height of the second air gap is greater than the height of the raster structure protruding from the lens body.

[0015] In some embodiments, the cover plate is an optically transparent resin or optically transparent glass.

[0016] In a second aspect of the present invention, there is provided a near-eye display device comprising a housing, a projection device mounted in the housing, and an optical waveguide lens as described in any one of the above claims, wherein the optical waveguide lens is mounted in the housing, and the optical waveguide lens is used to focus an image generated by the projection device in front of a human eye. Effect of the Invention

[0017] The beneficial effect of the present invention is that by filling at least a portion of the first air gap and at least a portion of the second air gap with the filling member, the risk of fine impurities such as water vapor and dust in the external environment entering the first air gap and the second air gap is reduced, which helps to improve the imaging effect and imaging stability of the optical waveguide lens and extend the service life of the optical waveguide lens, and thus contributes to improving the operating stability and service life of the near-eye display device, and enhancing the user's usage experience. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a cross-sectional view of an optical waveguide lens according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view of an optical waveguide lens according to another embodiment of the present invention. [Explanation of symbols]

[0019] 1: optical waveguide sheet, 11: lens body, 12: raster structure, 2: first air gap, 3: filling member, 31: first filling member, 32: second filling member, 4: cover plate, 5: second air gap. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] The present invention will be further described below in combination with the accompanying drawings and embodiments.

[0021] In an embodiment of the present application, a near-eye display device is provided, which may be an AR device or a VR device, and specifically, is a head-mounted display device such as glasses, a helmet, or a face shield, and the embodiment of the present application does not particularly limit the specific type of the near-eye display device.

[0022] The near-eye display device comprises a housing, a projection device attached to the housing, and an optical waveguide lens attached to the housing. When a user wears the near-eye display device, the optical waveguide lens is positioned in front of the person's eye, and the projection device can generate a target image while the near-eye display device is in operation. The optical waveguide lens forms the target image in front of the person's eye by performing operations such as reflection and diffraction of light rays, thereby realizing the near-eye display function of the near-eye display device.

[0023] The specific structure of the optical waveguide lens is, as shown in Fig. 1, equipped with one or more optical waveguide sheets 1. When the number of optical waveguide sheets 1 is one, the thickness of the entire optical waveguide lens can be reduced, and the material cost and processing cost of the optical waveguide lens can be reduced. When the number of optical waveguide sheets 1 is multiple, the multiple optical waveguide sheets 1 are stacked along the thickness direction, and the optical waveguide sheet 1 can diffract light of a specific wavelength. By providing multiple stacked optical waveguide sheets, the wavelength range of light that the optical waveguide lens can diffract can be widened, which helps to realize color imaging of the optical waveguide lens, improves the imaging effect of the optical waveguide sheet 1, and thus enhances the near-eye display effect of the near-eye display device.

[0024] As shown in FIG. 1, the optical waveguide sheet 1 comprises a lens body 11 and a raster structure 12 provided on the lens body 11. The raster structure 12 is used to diffract light, and the lens body 11 is used to perform total reflection of the light, so that the light irradiated to the lens body 11 is totally reflected by the raster structure 12, reducing the risk of the light being refracted by the lens body 11 and weakening the light intensity, improving the imaging intensity of the optical waveguide lens, enhancing the near-eye display intensity of the near-eye display device, and improving the user's experience.

[0025] When the number of optical waveguide sheets 1 is more than one, the number of optical waveguide sheets 1 may be two as shown in Fig. 1, or may be three or more as shown in Fig. 2. In the embodiment of the present application, the specific number of optical waveguide sheets 1 is not particularly limited so as to increase the flexibility of the optical waveguide lens structure.

[0026] As shown in Figures 1 and 2, when multiple optical waveguide sheets 1 are stacked along the thickness direction, there is a predetermined distance between adjacent optical waveguide sheets 1 so as to form a first air gap 2, and along the thickness direction of the optical waveguide lens, the height of the first air gap 2 is greater than the height of the raster structure 12 protruding from the lens body 11.

[0027] In this embodiment, the height of the first air gap 2 is made larger than the height of the raster structure 12 protruding from the lens body 11, which reduces the risk of the raster structure 12 in the optical waveguide sheet 1 interfering with the lens body 11 of an adjacent optical waveguide sheet 1, helps to extend the service life of the optical waveguide sheet 1, and improves the operational stability of the optical waveguide sheet 1, thereby enhancing the operational stability and service life of the optical waveguide lens and near-eye display device.

[0028] As shown in FIGS. 1 and 2, a filler member 3 for filling at least a portion of the first air gap 2 is provided within the first air gap 2 .

[0029] In this embodiment, by filling at least a portion of the first air gap 2 with the filling material 3, the risk of fine impurities such as water vapor and dust in the external environment entering the first air gap 2 is reduced, which is helpful in improving the imaging effect and imaging stability of the optical waveguide lens and extending the service life of the optical waveguide lens, and thus contributing to improving the operating stability and service life of the near-eye display device, and enhancing the user's usage experience.

[0030] Specifically, the filling member 3 may be a light-transmitting member, which can reduce the light-blocking effect of the filling member 3, facilitate the propagation of light inside the optical waveguide lens, and increase the imaging stability of the optical waveguide lens.

[0031] The refractive index of the filling member 3 is 1.3 or less, and specifically, the refractive index of the filling member 3 may be 0.1, 0.3, 0.6, 1.0, 1.2, 1.3, or the like.

[0032] In this embodiment, the refractive index of the filling member 3 is 1.3 or less, that is, the filling member 3 has a low refractive index, which reduces the refraction effect of the filling member 3 on light, reduces the refraction of the light totally reflected by the lens body 11 out of the optical waveguide lens by the filling member 3, and reduces the attenuation effect of light propagation inside the optical waveguide lens, thereby improving the imaging strength of the optical waveguide lens and enhancing the imaging effect of the near-eye display device.

[0033] Here, the refractive index of the filling member 3 is 1.2 or more, that is, the refractive index of the filling member 3 is 1.2 to 1.3. Specifically, the refractive index of the filling member 3 may be 1.2, 1.24, 1.26, 1.27, 1.3, or the like.

[0034] In this embodiment, the refractive index of the filling member 3 is 1.2 to 1.3, which reduces the refractive effect of the filling member 3 on light and reduces the cost of the filling member 3, thereby contributing to reducing the costs of the optical waveguide lens and near-eye display device.

[0035] In addition, the filling member 3 is a transparent adhesive, and specifically, the transparent adhesive may be a transparent tape, a transparent glue, etc., which can increase the structural flexibility of the filling member 3.

[0036] By fixing the connection between adjacent optical waveguide sheets 1 with the filling member 3, the method of connecting adjacent optical waveguide sheets 1 is simplified, the risk of increased connection costs due to the fixed connection between adjacent optical waveguide sheets 1 using other structures is reduced, and this helps to reduce the costs of the optical waveguide lens and near-eye display device, as well as reducing the number of parts required for the fixed connection between adjacent optical waveguide sheets 1, contributing to the miniaturization of the optical waveguide lens and the entire near-eye display device, and making the near-eye display device convenient to transport and carry.

[0037] In any of the above embodiments, as shown in Figures 1 and 2, the optical waveguide lens further includes a cover plate 4, which is fixedly connected to the optical waveguide sheet 1, and the cover plate 4 is located on one or both sides of the optical waveguide sheet 1 along the thickness direction of the optical waveguide lens.

[0038] In this embodiment, a cover plate 4 is fixedly connected to one or both sides of the optical waveguide sheet 1, which reduces the risk of the optical waveguide sheet 1 being directly exposed to the external environment and damaged, extends the service life of the optical waveguide sheet 1, and ultimately improves the operational stability and service life of the optical waveguide lens and near-eye display device.

[0039] Specifically, along the thickness direction of the optical waveguide sheet 1, the cover plate 4 is fixedly connected to the side of the lens body 11 on which the raster structure 12 is provided, or along the thickness direction of the optical waveguide sheet 1, the cover plate 4 is fixedly connected to both sides of the lens body 11.

[0040] As shown in Figures 1 and 2, there is a second air gap 5 between the cover plate 4 and the optical waveguide sheet 1 along the thickness direction of the optical waveguide lens, and the height of the second air gap 5 is greater than the height of the raster structure 12 protruding from the lens body 11, which helps to reduce the risk of the raster structure 12 in the optical waveguide sheet 1 interfering with the lens body 11 of the adjacent optical waveguide sheet 1, extend the service life of the optical waveguide sheet 1, and improve the operational stability of the optical waveguide sheet 1, thereby improving the operational stability and service life of the optical waveguide lens and the near-eye display device.

[0041] As shown in FIGS. 1 and 2, a filler member 3 is provided in the second air gap 5 for filling at least a portion of the second air gap 5 .

[0042] In this embodiment, by filling at least a portion of the second air gap 5 with the filling material 3, the risk of fine impurities such as water vapor and dust in the external environment entering the second air gap 5 is reduced, and the imaging effect and imaging stability of the optical waveguide lens are improved, which helps to extend the service life of the optical waveguide lens, thereby improving the operating stability and service life of the near-eye display device, and enhancing the user experience.

[0043] Furthermore, the filling member 3 in the first air gap 2 is a first filling member 31, and the filling member 3 in the second air gap 5 is a second filling member 32. The materials of the first filling member 31 and the second filling member 32 may be the same or different so as to increase the installation flexibility of the first filling member 31 and the second filling member 32. In the actual production processing and maintenance process, the materials of the first filling member 31 and the second filling member 32 can be adaptively adjusted so as to reduce the material costs of the first filling member 31 and the second filling member 32, and thus reduce the processing costs and maintenance costs of the optical waveguide lens.

[0044] In any of the above embodiments, the cover plate 4 is made of a light-transmitting resin or a light-transmitting glass.

[0045] In this embodiment, the cover plate 4 is made of a light-transmitting material, which reduces the light blocking by the cover plate 4 and makes it easier for the user to view the external environment and objects through the optical waveguide lens. After wearing the near-eye display device, the user can perform normal walking, work and other operations, thereby improving the usage scenarios of the optical waveguide lens and the near-eye display device and enhancing the user's usage experience.

[0046] The above-described embodiments are merely examples of the present invention, and those skilled in the art may make further improvements without departing from the creative idea of ​​the present invention, which are hereby included within the scope of protection of the present invention.

Claims

1. The optical waveguide lens includes a waveguide sheet (1), the number of the waveguide sheets (1) is at least two, the waveguide sheets (1) are stacked along the thickness direction of the optical waveguide lens, and adjacent ones of the optical waveguide sheets (1) are fixedly connected to each other, A first air gap (2) is provided between adjacent ones of the optical waveguide sheets (1) along the thickness direction of the optical waveguide lens, A filling member (3) is provided in the first air gap (2) for filling at least a portion of the first air gap (2).

1. An optical waveguide lens comprising:

2. The filling member (3) is a light-transmitting member, The refractive index of the filling member (3) is 1.3 or less.

2. The optical waveguide lens according to claim 1.

3. The refractive index of the filling member (3) is 1.2 or more.

3. The optical waveguide lens according to claim 2.

4. The filling member (3) is a transparent adhesive, and adjacent optical waveguide sheets (1) are fixedly connected with the filling member (3).

2. The optical waveguide lens according to claim 1.

5. The optical waveguide sheet (1) comprises a lens body (11) and a raster structure (12) provided on the lens body (11), and along a thickness direction of the optical waveguide lens, a height of the first air gap (2) is greater than a height of the raster structure (12) protruding from the lens body (11); 5. The optical waveguide lens according to claim 1,

6. The optical waveguide lens further comprises a cover plate (4), the cover plate (4) being fixedly connected to the optical waveguide sheet (1); The cover plate (4) is located on one or both sides of the optical waveguide sheet (1) along the thickness direction of the optical waveguide lens.

5. The optical waveguide lens according to claim 1,

7. A second air gap (5) is provided between the cover plate (4) and the optical waveguide sheet (1) along the thickness direction of the optical waveguide lens; The filling member (3) is provided in the second air gap (5) for filling at least a portion of the second air gap (5).

7. The optical waveguide lens according to claim 6.

8. The optical waveguide sheet (1) comprises a lens body (11) and a raster structure (12) provided on the lens body (11), and the height of the second air gap (5) is greater than the height of the raster structure (12) protruding from the lens body (11) along the thickness direction of the optical waveguide lens.

8. The optical waveguide lens according to claim 7.

9. The cover plate (4) is made of a light-transmitting resin or a light-transmitting glass.

7. The optical waveguide lens according to claim 6.

10. Housing and a projection device mounted in the housing; The optical waveguide lens according to any one of claims 1 to 9, the light guide lens is attached to the housing, the light guide lens being used to focus an image generated by the projection device in front of a human eye; A near-eye display device.

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