Optical waveguide components and near-eye display devices

Abstract

The present invention provides an optical waveguide component and a near-eye display device. The optical waveguide component includes: an optical waveguide sheet; a micro-projector, the micro-projector is used to emit light to the optical waveguide sheet, the light emitted by the micro-projector is incident into the optical waveguide sheet at an acute angle or an obtuse angle, there are multiple micro-projectors, and at least two micro-projectors are respectively arranged on two opposite sides of the optical waveguide sheet; a diffraction grating, the diffraction grating is arranged on one side surface of the optical waveguide sheet, the diffraction grating is used to couple the light of the micro-projector into the optical waveguide sheet or transmit the light of the micro-projector out of the optical waveguide sheet; a reflective element, the reflective element is used to receive the light transmitted by the diffraction grating and reflect the light back to the diffraction grating. The present invention solves the problems of poor display efficiency and poor compatibility of optical waveguide components in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of diffraction optical devices, and in particular to an optical waveguide component and a near-eye display device. Background Art

[0002] With the continuous development and innovation of science and technology, virtual reality (VR), augmented reality (AR) and mixed reality (MR) have gradually entered industries such as industrial education. In terms of AR augmented reality, optical waveguide technology is an indispensable step. Some AR optical waveguide glasses equipped with optical waveguide components have been released on the market. Although the product has basically realized the basic functions, the display effect is not ideal, especially in the outdoor environment with strong light, the brightness is low. It is necessary to improve the display efficiency of the optical waveguide through design so that it can be used normally outdoors as well as indoors.

[0003] Moreover, the appearance of current waveguide glasses is somewhat different from that of traditional glasses. It is inevitable that waveguide glasses will tend to be similar to traditional glasses for daily wear. However, the design of waveguide glasses is different from that of traditional glasses. It is necessary to put additional micro-projectors into the temples to achieve integrated display. If the appearance of waveguide glasses is designed to be in the form of traditional glasses, the waveguide components in the waveguide glasses need to be redesigned. If the commonly used design scheme is adopted, the components in the waveguide components will interfere with the human head, which will not meet the wearing requirements and affect the wearing comfort.

[0004] That is to say, the optical waveguide assembly in the prior art has the problems of poor display efficiency and poor compatibility. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical waveguide component and a near-eye display device to solve the problems of poor display efficiency and poor compatibility of the optical waveguide component in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an optical waveguide component, comprising: an optical waveguide sheet; a micro-projector, the micro-projector is used to emit light to the optical waveguide sheet, the light emitted by the micro-projector enters the optical waveguide sheet at an acute angle or an obtuse angle, there are multiple micro-projectors, and at least two micro-projectors are respectively arranged on two opposite sides of the optical waveguide sheet; a diffraction grating, the diffraction grating is arranged on one side surface of the optical waveguide sheet, the diffraction grating is used to couple the light of the micro-projector into the optical waveguide sheet or transmit the light of the micro-projector out of the optical waveguide sheet; a reflecting element, the reflecting element is used to receive the light transmitted by the diffraction grating and reflect the light back to the diffraction grating.

[0007] Furthermore, the optical waveguide component also includes a filtering element, which is used to receive the light transmitted by the diffraction grating and reflect the light to the diffraction grating. The filtering element is located between the micro-projector and the optical waveguide plate and the filtering element transmits the light of the micro-projector. The reflecting element and the filtering element are respectively arranged on two opposite sides of the optical waveguide plate.

[0008] Furthermore, the multiple micro light projectors include a first micro light projector, a second micro light projector and a third micro light projector, the first micro light projector and the second micro light projector are arranged on one side of the optical waveguide plate, and the third micro light projector is arranged on the other side of the optical waveguide plate, and the angles of incidence of the light of the first micro light projector and the light of the second micro light projector to the optical waveguide plate are different.

[0009] Furthermore, the reflective element is used to receive the light transmitted by the second micro-projector through the diffraction grating, and reflect the light back to the diffraction grating.

[0010] Furthermore, the filter element is used to receive the light transmitted by the third micro-projector through the diffraction grating and reflect the light back to the diffraction grating. The filter element is arranged between the first micro-projector and the optical waveguide sheet, and the filter element transmits the light of the first micro-projector.

[0011] Furthermore, the first micro-projector, the filtering element and the third micro-projector are arranged in a straight line, the second micro-projector and the reflecting element are arranged in another straight line, and the first micro-projector, the filtering element, the third micro-projector, the second micro-projector and the reflecting element are arranged in an X shape.

[0012] Furthermore, the diffraction grating includes: a coupling-in grating, which is a transmission-type coupling-in grating and is used to couple the light of the micro-projector into the optical waveguide or transmit the light of the micro-projector out of the optical waveguide; and an output grating, which is used to receive the light coupled into the grating and couple the light out to the human eye for imaging.

[0013] Furthermore, the thickness of the optical waveguide sheet is greater than or equal to 400 um and less than or equal to 1 mm.

[0014] Furthermore, the material of the optical waveguide plate is high-refractive index glass or high-refractive optical crystal, and the refractive index of the high-refractive index glass or high-refractive optical crystal is greater than or equal to 1.7.

[0015] According to another aspect of the present invention, there is provided a near-eye display device, comprising: a head-mounted frame, the head-mounted frame carrying the above-mentioned optical waveguide component.

[0016] According to the technical solution of the present invention, the optical waveguide component includes an optical waveguide sheet, a micro-projector, a diffraction grating and a reflective element. The micro-projector is used to emit light to the optical waveguide sheet. The light emitted by the micro-projector enters the optical waveguide sheet at an acute angle or an obtuse angle. There are multiple micro-projectors, and at least two micro-projectors are respectively arranged on two opposite sides of the optical waveguide sheet; the diffraction grating is arranged on one side surface of the optical waveguide sheet, and the diffraction grating is used to couple the light of the micro-projector into the optical waveguide sheet or transmit the light of the micro-projector out of the optical waveguide sheet; the reflective element is used to receive the light transmitted by the diffraction grating and reflect the light back to the diffraction grating.

[0017] The optical waveguide provides a setting position for the diffraction grating, which is conducive to ensuring the reliability of the use of the diffraction grating. At the same time, it can ensure that the light coupled into the optical waveguide through the diffraction grating can be transmitted in the form of total reflection, avoiding light energy loss, ensuring transmission efficiency, and thus ensuring the final display efficiency. The light emitted by the micro-projector is incident into the optical waveguide at an acute angle or an obtuse angle. This setting makes the light emitted by the micro-projector not vertically incident into the optical waveguide. Since the light emitted by multiple micro-projectors is incident into the optical waveguide at different angles, the final image light will be output at different angles. Therefore, a special design is required to integrate them to ensure the integrity of the image information. The light of the incident angles in multiple micro-projectors is transmitted out of the optical waveguide through the diffraction grating and then reaches the reflective element. The reflective element reflects the light back to the diffraction grating, so that the light can be coupled into the optical waveguide by the diffraction grating. Then, the multiple beams of light from multiple micro-projectors are coupled out to the human eye by the diffraction grating for imaging after the pupil expansion transmission in the optical waveguide.

[0018] The light emitted by current micro-projectors is usually incident vertically on the optical waveguide sheet. This makes the wearer feel uncomfortable when worn on the human head due to the protruding ears of the head's three-dimensional features, and the overall appearance does not look like traditional glasses. The present application arranges multiple micro-projectors in different ways so that the optical waveguide sheet is tilted rather than horizontally arranged relative to the human eye, making the appearance of the optical waveguide assembly closer to traditional glasses and more suitable for users to wear on their faces. By providing a reflective element, the reflective element can change the direction of the light path, effectively planning the direction of the light, avoiding the risk of interfering with the head when worn, and ensuring the normal transmission of light in the optical waveguide sheet while ensuring the user's wearing comfort. The optical waveguide assembly of the present application can meet the design of traditional glasses while improving the waveguide performance, reducing the interference between the micro-projector and the head, improving wearing comfort, and increasing compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 A top view of the waveguide glasses in the prior art when worn is shown;

[0021] Figure 2 A schematic diagram of the optical path of an optical waveguide assembly in waveguide glasses in the prior art is shown;

[0022] Figure 3 shows a top view of conventional glasses when worn;

[0023] Figure 4 Shows the use of Figure 3 A schematic diagram of the optical path of the optical waveguide component in the waveguide glasses;

[0024] Figure 5 A schematic diagram of the optical path of an optical waveguide assembly according to an alternative embodiment of the present invention is shown.

[0025] The above drawings include the following reference numerals:

[0026] 10. Optical waveguide; 21. First micro-projector; 22. Second micro-projector; 23. Third micro-projector; 31. In-coupling grating; 32. Out-coupling grating; 40. Reflection element; 50. Filter element; 60. Human eye. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0029] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0030] like Figure 1 As shown in the figure, it is a top view of conventional waveguide glasses currently on the market when worn. The optical waveguide sheet is arranged horizontally between the human eye, that is, the two optical waveguide sheets corresponding to the left and right eyes of the waveguide glasses are parallel to the left and right eyes respectively, and the two optical waveguide sheets are arranged along a plane at intervals, and the angle between the two optical waveguide sheets is 180 degrees. However, traditional glasses usually have a partial angle to make the glasses fit the face more closely. Figure 3As shown in the figure, the two lenses corresponding to the left and right eyes are not arranged in the same plane but have the same angle with the same plane, and the ends of the two lenses connected to the temples are tilted towards the direction close to the human eye. Figure 3 The design direction of traditional glasses is close to that of traditional glasses, and it is more acceptable to the public in terms of comfort and aesthetics. However, considering the combination of micro-projection light machine and optical waveguide sheet, the optical path transmission diagram of the optical waveguide component carried in waveguide glasses when there is no angle is as follows Figure 2 As shown in the figure, it can be seen that the light emitted by the micro-projector is perpendicular to the incident light waveguide. Figure 3 In the form of an angle, the light path in the optical waveguide component of the waveguide glasses needs to reach the eye normally. Figure 4 As shown in the setting, since the micro-projector is generally placed in the temple, this design makes the position of the micro-projector placed in the temple closer to the head, which will interfere with the head and cannot meet the wearing comfort.

[0031] Waveguide glasses are developing in the direction of being shaped like traditional glasses, but the current waveguide design will affect the user's wearing experience. When the optical waveguide sheet has a tilt angle, the micro-projector needs to adjust its placement. Conventional design will cause interference between the micro-projector and the temple, affecting wearing experience. Regarding the display efficiency of the optical waveguide components in waveguide glasses, the performance of the micro-projector is also an important factor affecting its display. While designing the optical waveguide components, improving the efficiency of the micro-projector can also greatly improve the final display effect. Some monochrome micro-projectors are very efficient, but a single monochrome micro-projector cannot be used for color display. Therefore, multiple monochrome light machines can be combined to achieve color display and increase display efficiency.

[0032] In order to solve the problems of poor display efficiency and poor compatibility of optical waveguide components in the prior art, the present invention provides an optical waveguide component and a near-eye display device.

[0033] like Figure 5 As shown, the optical waveguide component includes an optical waveguide sheet 10, a micro-projector, a diffraction grating and a reflective element 40. The micro-projector is used to emit light to the optical waveguide sheet 10. The light emitted by the micro-projector is incident on the optical waveguide sheet 10 at an acute angle or an obtuse angle. There are multiple micro-projectors, and at least two micro-projectors are respectively arranged on two opposite sides of the optical waveguide sheet 10; the diffraction grating is arranged on one side surface of the optical waveguide sheet 10, and the diffraction grating is used to couple the light of the micro-projector into the optical waveguide sheet 10 or transmit the light of the micro-projector out of the optical waveguide sheet 10; the reflective element 40 is used to receive the light transmitted by the diffraction grating and reflect the light back to the diffraction grating.

[0034] The optical waveguide plate 10 provides a setting position for the diffraction grating, which is conducive to ensuring the reliability of the use of the diffraction grating. At the same time, it can ensure that the light coupled into the optical waveguide plate 10 through the diffraction grating can be transmitted in the form of total reflection, avoiding light energy loss, ensuring transmission efficiency, and thus ensuring the final display efficiency. The light emitted by the micro-projector is incident on the optical waveguide sheet 10 at an acute angle or an obtuse angle. This arrangement ensures that the light emitted by the micro-projector is not incident vertically on the optical waveguide sheet 10. Since the lights emitted by multiple micro-projectors are incident on the optical waveguide sheet 10 at different angles, in order to ensure the integrity of the image information, the incident lights at the same angle emitted by different optical machines need to be coupled out at the same angle; the incident light in multiple micro-projectors is transmitted through the diffraction grating out of the optical waveguide sheet 10 and then reaches the reflective element 40. The reflective element 40 reflects the light back to the diffraction grating, so that the light can be coupled into the optical waveguide sheet 10 by the diffraction grating, and then the multiple beams of light from the multiple micro-projectors are coupled out by the diffraction grating to the human eye 60 for imaging after the pupil is expanded and transmitted in the optical waveguide sheet 10.

[0035] like Figure 5 As shown, the optical waveguide component also includes a filtering element 50, which is used to receive the light transmitted by the diffraction grating and reflect the light to the diffraction grating, which is consistent with the function of the reflecting element 40. The filtering element 50 is located between the micro-projector and the optical waveguide plate 10 and the filtering element 50 transmits the light of the micro-projector. The reflecting element 40 and the filtering element 50 are respectively arranged on two opposite sides of the optical waveguide plate 10. By setting the filter element 50, the light of one of the multiple micro-projectors is transmitted through the coupling grating 31 of the diffraction grating out of the optical waveguide plate 10, and then reaches the filter element 50, and then the filter element 50 reflects the light to the coupling grating 31, and the coupling grating 31 couples the light into the interior of the optical waveguide plate 10. The filter element 50 is set between another micro-projector and the optical waveguide plate 10, so that the filter element 50 can transmit the light of another micro-projector, so that the light emitted by another micro-projector that meets the total reflection condition is directly transmitted to the coupling grating 31 through the filter element 50, and then is coupled into the optical waveguide plate 10 by the coupling grating 31. That is to say, the filter element 50 reflects the light of one micro-projector and transmits the light of another micro-projector. This configuration enables the filter element 50 to transmit light of a specific wavelength and reflect light of another specific wavelength. Reasonable configuration is beneficial to changing the trend of light and changing the direction of the light path to ensure the integrity of image information. It is also beneficial to the structural rationality of the optical waveguide component and ensures compatibility and wearing comfort without affecting the light transmission efficiency.

[0036] The light emitted by the current micro-projectors is usually incident vertically on the optical waveguide sheet 10, so when worn on the human head, due to the protruding ears of the head's three-dimensional features, such head-mounted devices usually make the wearer feel uncomfortable, and the overall appearance does not look like traditional glasses. The present application uses different arrangements of multiple micro-projectors to make the optical waveguide sheet 10 and the human eye 60 tilted instead of horizontally arranged, so that the appearance of the optical waveguide component is closer to traditional glasses and more satisfactory for users to wear on their faces. By setting the reflective element 40, the reflective element 40 can change the direction of the light path, effectively plan the direction of the light, avoid the risk of interfering with the head when worn, and ensure the normal transmission of light in the optical waveguide sheet 10 while ensuring the user's wearing comfort, so that the optical waveguide component of the present application can not only meet the design of traditional glasses, but also improve the waveguide performance, reduce the interference between the micro-projector and the head, improve the wearing comfort, and increase compatibility.

[0037] It should be noted that the above-mentioned reflective element 40 and filter element 50 are both arranged outside the optical waveguide sheet 10. The reflective element 40 can be a reflector, and the filter element 50 is designed to transmit light of a specific wavelength and reflect light of another specific wavelength. The filter element 50 can be designed to transmit and reflect the wavelength range of light according to the different positions of different micro-projectors.

[0038] Specifically, the diffraction grating includes a coupling-in grating 31, a turning grating, and a coupling-out grating 32. The coupling-in grating 31 and the coupling-out grating 32 are arranged at intervals on the side surface of the optical waveguide plate 10 away from the human eye 60. The turning grating can be on the same side surface as the coupling-in grating 31 or on different sides. In this scheme, it is marked that there is one coupling-in grating 31, and the coupling-in grating 31 is a transmission-type coupling-in grating 31. The transmission-type coupling-in grating 31 is used to couple the light of the first micro-projector 21 into the optical waveguide plate 10 or to transmit the light of the second micro-projector 22 and the third micro-projector 23 out of the optical waveguide plate 10; the coupling-out grating 32 is used to receive the light of the coupling-in grating 31 and the turning grating, and couple the light out of the optical waveguide plate 10 to reach the human eye 60 for imaging. The coupling grating 31 is used to diffract the incident light into different angles for transmission in the optical waveguide 10. Its purpose is to guide the light of the micro-projector into the optical waveguide 10 with maximum efficiency. Usually, the duty cycle of the coupling grating 31 is in the range of 30%-80%, the height of the coupling grating 31 is in the range of 50nm to 500nm (when the coupling grating 31 is a multi-layer grating, the height range refers to the height range of each layer of the grating, and the number of layers of the multi-layer grating ranges from 1 to 10 layers), and the period of the coupling grating 31 is in the range of 300nm to 600nm. The specific parameters can be adjusted, and finally the uniformity of the coupled light intensity can be adjusted to meet specific requirements.

[0039] In an optional embodiment of the present application, the diffraction grating also includes a turning grating, and the turning grating, the coupling-in grating 31, and the coupling-out grating 32 are located on the same side surface or different sides of the optical waveguide sheet 10. The turning grating is used to receive the light coupled into the grating 31 and transmit the light in a pupil-expanding manner, and the coupling-out grating 32 is used to receive the light from the turning grating and couple the light out of the optical waveguide sheet 10 to the human eye 60 for display. The turning grating and the coupling-out grating 32 can be provided separately or designed as an integral whole, and can be selected according to actual conditions. The turning grating can transmit the light in the optical waveguide sheet 10 in one-dimensional or two-dimensional directions, and its purpose is to transmit and amplify the internal light along a specific direction, and to transmit the information of the micro-projector in a pupil-expanding manner; the coupling-out grating 32 can receive the light transmitted by the turning grating, further expand the pupil and couple it out, and its purpose is to couple the information of the micro-projector to the human eye 60 evenly and efficiently. The duty cycle of the outcoupling grating 32 is between 30% and 80%, the height is between 30nm and 300nm, and the period is between 300nm and 600nm. Different grating designs can meet different application requirements. The specific parameters can be adjusted to ultimately adjust the uniformity of the outcoupling light field to meet the application.

[0040] like Figure 5 As shown, the multiple micro-projectors are all monochromatic micro-projectors, and the wavelengths of light transmitted by the multiple micro-projectors are different. In the present application, the multiple micro-projectors include three, and the multiple micro-projectors include a first micro-projector 21, a second micro-projector 22, and a third micro-projector 23. The first micro-projector 21 and the second micro-projector 22 are arranged on one side of the optical waveguide sheet 10, and the third micro-projector 23 is arranged on the other side of the optical waveguide sheet 10, and the light of the first micro-projector 21 and the light of the second micro-projector 22 are incident on the optical waveguide sheet 10 at different angles. The reflective element 40 and the third micro-projector 23 are located on one side of the human eye 60, and the reflective element 40 is used to receive the light transmitted by the second micro-projector 22 through the coupling grating 31, and reflect the light back to the coupling grating 31. The filter element 50 is used to receive the light transmitted from the third micro-projector 23 through the coupling grating 31 and reflect the light back to the coupling grating 31. The filter element 50 is arranged between the first micro-projector 21 and the optical waveguide plate 10, and the filter element 50 transmits the light of the first micro-projector 21.

[0041] like Figure 5As shown, the optical path is changed by the reflective element 40 and the filter element 50 so that the light from the three micro-projectors can enter the optical waveguide plate 10 through the coupling grating 31, and then be transmitted to the human eye 60 through the pupil expansion, while avoiding interference with the head. The specific optical path transmission is as follows: the light emitted by the third micro-projector 23 on the same side as the human eye 60 passes through the coupling grating 31, and most of the light is transmitted through the optical waveguide sheet 10 to reach the filter element 50. The filter element 50 only reflects the light of this wavelength, and the reflection is transmitted to the coupling grating 31 again to be coupled into the optical waveguide sheet 10; the light emitted by the first micro-projector 21 on the same side as the human eye 60 directly passes through the filter element 50, and the filter element 50 only transmits the light of this wavelength, directly reaches the coupling grating 31 and enters the optical waveguide sheet 10; the light emitted by the second micro-projector 22 passes through the coupling grating 31 because the angle does not reach the total reflection condition, and directly transmits out of the optical waveguide sheet 10 to reach the reflecting element 40. After being reflected by the reflecting element 40, it reaches the coupling grating 31 and then enters the optical waveguide sheet 10, and finally the light of the three micro-projectors is emitted from the same coupling grating 32 to reach the human eye 60, thereby realizing imaging.

[0042] like Figure 5 As shown, the first micro-projector 21, the filter element 50 and the third micro-projector 23 are arranged in a straight line, and the second micro-projector 22 and the reflective element 40 are arranged in another straight line, and the first micro-projector 21, the filter element 50, the third micro-projector 23, the second micro-projector 22 and the reflective element 40 are arranged in an X shape. By reasonably setting the arrangement of each component, it is helpful to plan the transmission direction of light and to ensure the transmission efficiency of light. At the same time, the optical waveguide component of the present application is suitable for the appearance of conventional glasses, avoiding interference with the wearer's head, increasing compatibility, and ensuring wearing comfort. Of course, only Figure 5 The embodiments introduce the optical path of the optical waveguide assembly of the present application, which is arranged similarly to this, but is not limited to this. The specific structural arrangement can be changed according to actual needs.

[0043] Specifically, the thickness of the optical waveguide sheet 10 is greater than or equal to 400um and less than or equal to 1mm. If the thickness of the optical waveguide sheet 10 is less than 400um, the optical waveguide sheet 10 is not easy to manufacture, which increases the difficulty of processing the optical waveguide sheet 10. At the same time, the optical waveguide sheet 10 is easy to break during use, which reduces the structural strength of the optical waveguide sheet 10. If the thickness of the optical waveguide sheet 10 is greater than 1mm, the thickness of the optical waveguide sheet 10 is too large, which is not conducive to the thinness of the optical waveguide sheet 10. Limiting the thickness of the optical waveguide sheet 10 to the range of 400um to 1mm ensures the thinness of the optical waveguide sheet 10 while ensuring the structural strength of the optical waveguide sheet 10.

[0044] Specifically, the material of the optical waveguide sheet 10 is high refractive index glass or high refractive optical crystal, and the refractive index of the high refractive index glass or high refractive optical crystal is greater than or equal to 1.7. The refractive index of the optical waveguide sheet 10 is greater than or equal to 1.7 and less than or equal to 2.3. This arrangement is conducive to ensuring the high refractive index characteristics of the optical waveguide sheet 10. The high refractive index can increase the size of the field of view. Different materials are selected according to actual needs to realize the optical waveguide sheet 10 with a super large field of view.

[0045] Specifically, the coupling-in grating 31 can be a one-dimensional grating or a two-dimensional grating; the turning grating can be a one-dimensional grating or a two-dimensional grating; the coupling-out grating 32 can be a one-dimensional grating or a two-dimensional grating. The one-dimensional grating includes one of a blazed grating, a tilted grating, a rectangular grating, a double-ridge grating, and a one-dimensional multilayer grating; the two-dimensional grating has periodic changes in both directions, and the two-dimensional grating includes one of a rectangular grating, a parallelogram grating, a diamond grating, and a two-dimensional multilayer grating. The specific selection of the coupling-in grating 31, the turning grating, and the coupling-out grating 32 can be set according to the actual situation.

[0046] It should be noted that the blazed grating is a grating with blazed characteristics in which the groove surface is not parallel to the grating normal, that is, there is a small angle between the two. The sawtooth grating is the most ideal blazed grating, and the sawtooth grating has a sawtooth structure on its cross section for diffraction. The tilted grating is a grating in which the plane of the grating is at a certain inclination angle with the grating tangent. The rectangular grating is a grating in which the cross section is a rectangular structure for diffraction.

[0047] It should be noted that the above-mentioned micro-projector can be a self-luminous active device, which can have a certain tilt angle and be used in combination with the optical waveguide sheet 10 to adapt to the shape of the glasses. The commonly used micro-projectors such as micro-OLED or micro-LED can also be a liquid crystal display screen that requires external light source illumination, including transmissive LCD and reflective LCOS, as well as a digital micromirror array DMD based on micro-electromechanical system MEMS technology, that is, the core of DLP and laser beam scanner LBS, etc. This ensures that the micro-projector can provide monochrome or color image light source information. The requirements for the micro-projector are that it needs to provide sufficiently strong light and be small in size, and occupy as little volume as possible in the near-eye display device. However, the various micro-projectors now have their own advantages and disadvantages, and a specific light source needs to be selected through a specific solution. For example, some micro-projectors can provide sufficient brightness for monochrome and are small in size, but if color display is to be achieved, multiple micro-projectors with different wavelengths need to be used in combination. The solution provided by this application can meet the requirements of multiple light machines being matched in the same near-eye display device without interference.

[0048] The present application also provides a near-eye display device, including a head-mounted frame, which is equipped with the above-mentioned optical waveguide component. The micro-projector emits image light to the optical waveguide component, and the optical waveguide component couples the image light out to the human eye 60. As the light propagates in the optical waveguide sheet 10, the optical waveguide sheet 10 expands the received light into at least one dimension. The coupling grating 31 is designed to couple light into the optical waveguide sheet 10. The turning grating and the coupling grating 32 are designed to output the enlarged image light and couple it out to the human eye 60. The head-mounted frame can be one of a helmet, a head mask and a glasses frame.

[0049] When the head-mounted frame is a spectacle frame, the spectacle frame includes a frame and temples. The optical waveguide sheet 10 of the optical waveguide assembly is arranged on the frame, and there are two optical waveguide sheets 10, which are arranged in an eight-shaped shape, that is, one end of the optical waveguide sheet 10 having the coupling grating 31 is tilted toward the direction close to the human eye 60, and the two coupling gratings 32 on the two optical waveguide sheets 10 correspond to the left and right eyes respectively; there are two temples, which extend from the two ends of the frame, and the ends of the two temples connected to the frame are respectively arranged corresponding to the coupling gratings 31 on the two optical waveguide sheets 10, so that it is convenient to arrange the micro-projector, the reflection element 40 and the filter element 50 of the optical waveguide assembly in the temples.

[0050] It should be noted that the near-eye display device can be a head-mounted device, such as AR glasses, that is, the waveguide glasses mentioned above.

[0051] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0053] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical waveguide component, characterized in that: include: Optical waveguide sheet (10); A micro-light projector, the micro-light projector being used to emit light toward the optical waveguide sheet (10), the light emitted by the micro-light projector entering the optical waveguide sheet (10) at an acute angle or an obtuse angle, the micro-light projectors being multiple, and at least two of the micro-light projectors being respectively arranged on two opposite sides of the optical waveguide sheet (10); a diffraction grating, the diffraction grating being arranged on a side surface of the optical waveguide sheet (10), the diffraction grating being used to couple the light of the micro-light projector into the optical waveguide sheet (10) or to transmit the light of the micro-light projector out of the optical waveguide sheet (10); a reflective element (40), the reflective element (40) being used to receive light transmitted by the diffraction grating and reflect the light back to the diffraction grating; The optical waveguide assembly further comprises a filter element (50), the filter element (50) being used to receive the light transmitted by the diffraction grating and reflect the light to the diffraction grating, the filter element (50) being located between the micro-light projector and the optical waveguide sheet (10) and transmitting the light of the micro-light projector, and the reflective element (40) and the filter element (50) being respectively arranged on two opposite sides of the optical waveguide sheet (10); The plurality of micro-light projectors include a first micro-light projector (21), a second micro-light projector (22) and a third micro-light projector (23); the first micro-light projector (21) and the second micro-light projector (22) are arranged on one side of the optical waveguide sheet (10), and the third micro-light projector (23) is arranged on the other side of the optical waveguide sheet (10); and the light of the first micro-light projector (21) and the light of the second micro-light projector (22) are incident on the optical waveguide sheet (10) at different angles; The first micro-light projector (21), the filtering element (50) and the third micro-light projector (23) are arranged on a straight line, the second micro-light projector (22) and the reflecting element (40) are arranged on another straight line, and the first micro-light projector (21), the filtering element (50), the third micro-light projector (23), the second micro-light projector (22) and the reflecting element (40) are arranged in an X shape; the reflecting element (40) and the filtering element (50) are both arranged outside the optical waveguide sheet (10), and the human eye (60) is on the same side as the third micro-light projector (23).

2. The optical waveguide assembly according to claim 1, characterized in that The reflective element (40) is used to receive the light transmitted by the second micro-light projector (22) through the diffraction grating, and reflect the light back to the diffraction grating.

3. The optical waveguide assembly according to claim 1, wherein: The filter element (50) is used to receive the light transmitted by the third micro-light projector (23) through the diffraction grating, and reflect the light back to the diffraction grating. The filter element (50) is arranged between the first micro-light projector (21) and the optical waveguide sheet (10), and the filter element (50) transmits the light of the first micro-light projector (21).

4. The optical waveguide assembly according to claim 1, wherein: The diffraction grating comprises: A coupling grating (31), wherein there is one coupling grating (31), and the coupling grating (31) is a transmission-type coupling grating (31), and the transmission-type coupling grating (31) is used to couple the light of the micro-light projector into the optical waveguide sheet (10) or transmit the light of the micro-light projector out of the optical waveguide sheet (10); An out-coupling grating (32) is used to receive the light from the in-coupling grating (31) and couple the light out to a human eye (60) for imaging.

5. The optical waveguide component according to any one of claims 1 to 4, characterized in that: The thickness of the optical waveguide sheet (10) is greater than or equal to 400 um and less than or equal to 1 mm.

6. The optical waveguide component according to any one of claims 1 to 4, characterized in that: The material of the optical waveguide plate (10) is high-refractive index glass or high-refractive optical crystal, and the refractive index of the high-refractive index glass or the high-refractive optical crystal is greater than or equal to 1.

7.

7. A near-eye display device, characterized in that: include: A head-mounted housing having the optical waveguide assembly according to any one of claims 1 to 6 mounted thereon.

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