CN219891488U - Near-to-eye display device - Google Patents

Abstract

The utility model discloses a near-eye display device, which comprises: the display module, first lens group, reflection unit and colour conversion subassembly, first lens group is located the light-emitting side of display module assembly, and reflection unit is located one side that first lens group deviates from display module assembly, and colour conversion subassembly is located the light-emitting side of reflection unit's reflection light. The display module is used for emitting monochromatic light, the first lens group is used for amplifying a display image of the display module, and the distance between two adjacent color conversion units in the display module is larger than the distance between two adjacent light-emitting units in the color conversion assembly, so that the manufacturing difficulty of the color conversion assembly can be reduced, and the large-scale production of the near-to-eye display device is facilitated.

Description

Near-to-eye display device

Technical Field

The utility model relates to the technical field of display, in particular to a near-to-eye display device.

Background

Near Eye Displays (NEDs), also known as head-mounted or wearable displays, create virtual images in the field of view of either the single or both eyes. Near-eye display is a content of the current research, and includes Virtual Reality (VR) display in the form of a helmet, augmented Reality (Augmented Reality, AR) display in the form of smart glasses, and the like. The near-to-eye display can provide unprecedented interactive feeling for people, and has important application value in various fields such as telemedicine, industrial design, education, military virtual training, entertainment and the like.

The near-eye display device can provide display images through the micro-display, and in order to ensure display quality, the micro-display is required to have extremely high pixel resolution, so that the micro-display is difficult to manufacture and large-scale mass production is difficult to realize.

Disclosure of Invention

An embodiment of the present utility model provides a near-eye display device including:

the display module is used for emitting monochromatic light according to the image to be displayed; the display module comprises a plurality of light-emitting units which are arranged in an array;

the first lens group is positioned on the light emitting side of the display module; the first lens group is used for amplifying a display image of the display module;

the reflecting unit is positioned at one side of the first lens group, which is away from the display module; the reflection unit is used for reflecting at least part of monochromatic light transmitted by the first lens group;

the color conversion component is positioned on the light emitting side of the reflected light of the reflection unit; the color conversion component is used for receiving the monochromatic light reflected by the reflection unit and converting the monochromatic light into color light for emergent;

the color conversion assembly comprises a plurality of color conversion units which are arranged in an array; the interval between two adjacent color conversion units is larger than the interval between two adjacent light emitting units.

In the embodiment of the utility model, because the interval between two adjacent color conversion units in the color conversion assembly is larger than the interval between two adjacent light-emitting units in the display module, compared with the case that the color conversion layer is directly manufactured on the surface of the display module, the interval between the color conversion units in the color conversion assembly is larger, so that the precision requirement on the ink-jet printing or photoetching process is lower when the color conversion units are manufactured, the manufacturing difficulty can be reduced, the manufacturing efficiency is improved, and the large-scale production of the near-to-eye display device is facilitated.

In some embodiments of the utility model, the reflecting unit is a transflector; the transparent reflector is used for reflecting at least part of monochromatic light rays transmitted by the first lens group to the color conversion assembly and receiving and transmitting at least part of colored light rays emitted by the color conversion assembly; the color light transmitted by the transparent reflector is used for being incident into human eyes for imaging, so that the volume of the near-eye display device can be reduced.

In some embodiments of the present utility model, the reflectance of the monochromatic light transmitted by the first lens group by the transparent mirror is greater than the transmittance, so that light leakage can be reduced.

In some embodiments of the utility model, the transflector is a polarizing beamsplitter; the near-eye display device further includes: a polarizer located between the display module and the reflection unit; the polarizer is used for converting monochromatic light emitted by the display module into linearly polarized light, so that light leakage can be reduced, and the brightness of a display image can be ensured.

In some embodiments of the present utility model, further comprising: a second lens group positioned on one side of the transparent reflector away from the color conversion assembly; the second lens group is used for magnifying an image formed by the colored light rays transmitted by the transparent reflector. The display image can be enlarged and the volume of the near-eye display device can be advantageously reduced.

In some embodiments of the present utility model, the color conversion assembly further comprises: a light shielding unit; the shading units are positioned at the interval positions among the color conversion units, so that the light crosstalk can be reduced.

In some embodiments of the utility model, the wavelength of the monochromatic light is less than the wavelength of the colored light; the color conversion unit comprises a red color conversion unit, a green color conversion unit and a blue color conversion unit; the red color conversion unit is used for converting monochromatic light into red light, the green color conversion unit is used for converting monochromatic light into green light, and the blue color conversion unit is used for converting monochromatic light into blue light, so that the color gamut can be improved.

In some embodiments of the utility model, the monochromatic light is blue light; the color conversion unit comprises a red color conversion unit, a green color conversion unit and a blue light reflection unit; the red conversion unit is used for converting blue light into red light, the green conversion unit is used for converting blue light into green light, and the blue reflection unit is used for reflecting blue light. The use of quantum dot materials can be reduced, and the cost is reduced.

In some embodiments of the present utility model, the monochromatic light transmitted by the first lens group is collimated light, so as to reduce light crosstalk.

In some embodiments of the present utility model, the light emitting unit is a Micro LED chip, which is beneficial to improving the resolution of the near-eye display device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments of the present utility model will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic cross-sectional view of a near-eye display device according to an embodiment of the utility model;

FIG. 2 is a schematic diagram of a cross-sectional structure of a near-eye display device according to an embodiment of the utility model;

FIG. 3 is a schematic diagram of a third cross-sectional structure of a near-to-eye display device according to an embodiment of the utility model;

FIG. 4 is a schematic cross-sectional view of a near-to-eye display device according to an embodiment of the utility model;

FIG. 5 is a schematic cross-sectional view of a color conversion assembly according to an embodiment of the present utility model;

FIG. 6 is a schematic diagram of a second cross-sectional structure of a color conversion module according to an embodiment of the present utility model;

FIG. 7 is a schematic cross-sectional view of a near-to-eye display device according to an embodiment of the utility model;

FIG. 8 is a schematic cross-sectional view of a near-eye display device according to an embodiment of the utility model;

FIG. 9 is a schematic diagram of a cross-sectional structure of a near-eye display device according to an embodiment of the utility model;

FIG. 10 is a schematic cross-sectional view of a near-eye display device according to an embodiment of the utility model;

FIG. 11 is a schematic diagram illustrating a cross-sectional structure of a near-eye display device according to an embodiment of the utility model;

fig. 12 is a third schematic cross-sectional view of a color conversion device according to an embodiment of the present utility model.

Wherein, 100-display module, 110-light emitting unit, 200-first lens group, 300-reflecting unit, 400-color conversion component, 410-color conversion unit, 420-substrate, 430-shading unit, 500-second lens group, 411-red color conversion unit, 412-green color conversion unit, 413-blue color conversion unit, 414-blue light transmission unit, 600-polarizer, 415-blue light reflection unit.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a further description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted. The words expressing the positions and directions described in the present utility model are described by taking the drawings as an example, but can be changed according to the needs, and all the changes are included in the protection scope of the present utility model. The drawings of the present utility model are merely schematic representations of relative positional relationships and are not intended to represent true proportions.

Near Eye Displays (NEDs), also known as head-mounted or wearable displays, create virtual images in the field of view of either the single or both eyes. Near-eye display is a content of the current research, and includes Virtual Reality (VR) display in the form of a helmet, augmented Reality (Augmented Reality, AR) display in the form of smart glasses, and the like. The near-to-eye display can provide unprecedented interactive feeling for people, and has important application value in various fields such as telemedicine, industrial design, education, military virtual training, entertainment and the like.

The current near-eye display device aims at solving the problem of heavy whole display device caused by adopting a light emitting diode (Light Emitting Diode, abbreviated as LED) display or an organic light emitting diode (Organic Light Emitting Diode, abbreviated as OLED) display, further improving user experience, and gradually adopting a micro display as an image source of the near-eye display device. To ensure display quality, microdisplays need to have extremely high pixel resolution. Taking Micro light emitting diode (Mciro Light Emitting Diode, abbreviated as Micro LED) displays as an example, micro LED displays currently applied to near-eye display devices can have pixel densities as high as 3000ppi (pixels per inch). If a Micro LED display which simultaneously emits red, green and blue three-color light is directly adopted as an image source, on one hand, the display efficiency of a Micro LED chip is reduced due to the reduction of the pixel size. On the other hand, in the related art, there is a technical route for transferring red, green and blue Micro LED chips to realize full-color display, respectively, or a technical route for manufacturing a color conversion layer on the surface of the Micro LED display to perform color conversion after transferring by adopting a single-color Micro LED chip. However, since the number of Micro LED chips per unit area in the Micro display is rapidly increased, when the Micro LED chips of red, green and blue colors are respectively transferred, the transfer times are increased, the transfer difficulty is increased, and the resolution ratio of the color conversion layer manufactured by adopting the inkjet printing or photolithography process at present cannot meet the requirement, so that the manufacturing difficulty of the near-to-eye display device is high, and the large-scale mass production is difficult to realize.

In view of the above, the present utility model provides a near-eye display device for reducing the manufacturing difficulty of the near-eye display device, which is beneficial to realizing large-scale mass production.

Fig. 1 is a schematic cross-sectional view of a near-eye display device according to an embodiment of the utility model.

In an embodiment of the present utility model, as shown in fig. 1, a near-eye display device includes: the display module 100, the first lens group 200, the reflection unit 300, and the color conversion assembly 400.

The display module 100 is used for emitting imaging light according to an image to be displayed. The display module 100 includes a driving substrate and light emitting units 110 arranged in an array on the driving substrate, where the light emitting units 110 emit imaging light to display images under the driving of the driving substrate.

In the practice of the present utility model, the display module 100 may employ a Micro LED display. The Micro LED display employs Micro LED chips arranged in an array as the light emitting unit 110. The Micro LED chips can be tens of micrometers to several micrometers in size, and the smaller the Micro LED chips are, the more the Micro LED chips can be arranged in the same area, so that the miniaturization of the display is realized and the image display with higher resolution is realized.

In particular, the display module 100 provided in the embodiment of the present utility model is configured to emit monochromatic light, so as to generate a monochromatic image. The display module 100 emitting monochromatic light may include only one color of light emitting unit 110, so that the manufacturing difficulty of the display module 100 may be reduced.

For example, when the display module 100 employs a Micro LED display, the Mciro LED display generally needs to transfer a large number of Micro LED chips onto a driving substrate by mass transfer, and the Micro LED chips are driven to emit light by the driving substrate to display images. If the Mciro LED display adopts the Mciro LED chips of three colors of red, green and blue to emit light, the Mciro LED chips of three colors of red, green and blue are required to be transferred respectively during manufacturing, so that the times of transfer are more, and the transfer difficulty is higher. In the embodiment of the utility model, the Mciro LED display can only adopt Micro LED chips with one color, for example, only adopts blue Micro LED chips for emitting blue light, thereby reducing the manufacturing difficulty of the display module.

In the embodiment of the present utility model, the display module 100 is exemplified by a Micro LED display, and in the specific implementation, the display module 100 may also use other Micro displays, such as a Micro organic light emitting diode (Micro Organic Light Emitting Diode, mciro OLED) display, etc., which is not limited herein.

The first lens assembly 200 is located at the light emitting side of the display module 100. The first lens group 200 is configured to receive the imaging light emitted from the display module 100, and amplify the monochrome image generated by the display module 100 and emit the amplified monochrome image, so that a user can see the amplified virtual image. As shown in fig. 1, the first lens group 200 may employ a single convex lens or a fresnel lens. The first lens group 200 may also be a meniscus lens group or a fresnel lens group, which is not limited herein. The first lens group 200 is a lens group formed by a plurality of lenses, and can improve the degree of freedom of optical design of the lenses and correct aberrations. In particular, the material for manufacturing each lens in the first lens group 200 may be optical glass, optical resin, or the like, and is not limited thereto.

The reflection unit 300 is located at a side of the first lens assembly 200 facing away from the display module 100. The reflection unit 300 receives the monochromatic light generated by the display module 100 and transmitted through the first lens group 200, and reflects at least a portion of the received monochromatic light.

The color conversion assembly 400 is positioned at the light emitting side of the reflected light of the reflection unit 300. The color conversion assembly 400 is configured to receive the monochromatic light reflected by the reflection unit 300, convert the monochromatic light into color light, and emit the color light, so as to convert the monochromatic image generated by the display module 100 into a color image, and enable the near-eye display device to realize color display.

As shown in fig. 1, the color conversion assembly 400 includes a plurality of color conversion units 410 arranged in an array. The color conversion unit 410 is configured to receive monochromatic light and perform color conversion, so that the color light is emitted to realize display of a color image. In practice, the color conversion unit 410 may be formed on the substrate by inkjet printing or photolithography.

In practice, the color conversion assembly 400 receives the monochromatic light reflected by the reflection unit 300, so as to perform color conversion on the imaging light of each pixel point in the monochromatic image amplified by the first lens group 200. One of the color conversion units 410 corresponds to one pixel point in the monochrome image generated by the display module, and converts the monochrome light of the corresponding pixel point into light of the set color. Since the image reflected by the reflection unit 300 to the color conversion assembly 400 is a monochrome image amplified by the first lens group 200, the distance between the pixels in the monochrome image amplified by the first lens group 200 is greater than the distance between the pixels in the original monochrome image generated by the display module 100, and thus in the embodiment of the utility model, the distance between two adjacent color conversion units 410 in the color conversion assembly 400 is greater than the distance between two adjacent light emitting units 110 in the display module 100. And, the interval between the two adjacent color conversion units 410 is positively correlated with the magnification of the first lens group 200 to the image generated by the display module 100, and the interval between the two adjacent color conversion units 410 can be adjusted by adjusting the magnification of the first lens group 200.

In the embodiment of the present utility model, because the interval between two adjacent color conversion units 410 in the color conversion assembly 400 is larger than the interval between two adjacent light emitting units 110 in the display module 100, compared with directly manufacturing the color conversion layer on the surface of the display module 100, the interval between the color conversion units in the color conversion assembly in the embodiment of the present utility model is larger, so that the precision requirement on the inkjet printing or the photolithography process is lower when manufacturing the color conversion units, the manufacturing difficulty can be reduced, the manufacturing efficiency can be improved, and the large-scale production of the near-to-eye display device is facilitated.

In some embodiments, the monochromatic light rays transmitted by the first lens group 200 are collimated light rays.

Specifically, when the light emitting units 110 adopted in the display module 100 are Micro LED chips, since the outgoing light of the Micro LED chips is divergent light, in order to avoid light crosstalk of monochromatic light emitted by the adjacent light emitting units 110 when the monochromatic light enters the color conversion assembly 400, the light can be collimated by the first lens group 200, so that the outgoing light of each light emitting unit 110 enters the corresponding color conversion unit 410 in the form of collimated light beams for color conversion, thereby reducing light crosstalk and improving display quality.

FIG. 2 is a schematic diagram of a cross-sectional structure of a near-eye display device according to an embodiment of the utility model; FIG. 3 is a schematic diagram of a third cross-sectional structure of a near-to-eye display device according to an embodiment of the utility model; fig. 4 is a schematic cross-sectional view of a near-eye display device according to an embodiment of the utility model.

In some embodiments, as shown in fig. 2-4, the color conversion assembly 400 further includes a substrate 420, and the array of color conversion cells 410 is formed over the substrate 420. In particular, the substrate 420 is made of a transparent material, such as optical glass, optical resin, and the like. After the monochromatic light reflected by the reflection unit 300 to the color conversion assembly 400 is subjected to color conversion, the monochromatic light is transmitted to one side of the color conversion assembly 400 away from the reflection unit 300 through the color conversion assembly 400, a user views a display image from one side of the color conversion assembly 400 away from the reflection unit 300, and the color light transmitted by the color conversion assembly 400 is incident into human eyes so as to display the color image in the human eyes.

In some embodiments, as shown in fig. 2, the reflective unit 300 is a mirror. The reflection mirror receives the light transmitted by the first lens assembly 200 and totally reflects the light to the color conversion assembly 400 to improve the light utilization rate.

In some embodiments, as shown in fig. 3, the near-eye display device further comprises a second lens group 500. The second lens group 500 is located at a side of the color conversion assembly 400 facing away from the reflection unit 300. The second lens group 500 may further magnify the color image generated by the color conversion assembly 400 to increase the detail of the display image display. In addition, since the apparent distance between the human eyes is about 25cm, when the distance between the display image of the near-eye display device and the human eyes is about 25cm, the user can clearly view the display image and fatigue is not likely to occur. When the distance between the display image and human eyes is too short, the human eyes are difficult to focus, and cannot clearly watch the display image. Through setting up second lens group 500 between colour conversion subassembly 400 and user, second lens group 500 forms amplified virtual image V in colour conversion subassembly 400 one side that deviates from second lens group 500, under the prerequisite that does not increase near-eye display device's volume, can increase the distance between virtual image V and the human eye, is favorable to the human eye to focus, promotes user's viewing experience.

In particular, as shown in fig. 3, the second lens group 500 may employ a single convex lens or fresnel lens. The second lens group 200 may also be a meniscus lens group or a fresnel lens group, which is not limited herein. The second lens group 500 is a lens group formed of a plurality of lenses, and can improve the degree of freedom of optical design of the lenses and correct aberrations. In particular, the material for manufacturing each lens in the second lens group 500 may be optical glass, optical resin, or the like, and is not limited thereto.

In some embodiments, as shown in fig. 2 and 3, the color conversion assembly 400 further includes a light shielding unit 430. The light shielding units 430 are located at the interval positions between the color conversion units 410, and are used for shielding light, avoiding crosstalk between outgoing light of adjacent color conversion units 410, and improving display quality. In particular, the light shielding unit 430 may be made of a black light shielding material, which is not limited herein.

In specific implementation, as shown in fig. 2 and fig. 3, the near-eye display device may be VR glasses, and the VR glasses may present a virtual enlarged image in front of eyes of a user, so as to achieve a virtual reality display effect.

In some embodiments, as shown in fig. 4, the reflective unit 300 is a transflector. The trans-reflecting mirror receives the monochromatic light transmitted by the first lens group 200 and partially reflects the received monochromatic light to the color conversion assembly 400, and at the same time, the trans-reflecting mirror may transmit ambient light incident from the outside of the side of the trans-reflecting mirror facing away from the color conversion assembly 400. The monochromatic light reflected by the transparent reflector and the transmitted ambient light are transmitted to human eyes after passing through the color conversion assembly 400, so that the display effect of superposition of the virtual image and the real world is realized. In a specific implementation, the near-eye display device may be AR glasses, and the AR glasses may superimpose the virtual image in the real world, so as to achieve an augmented reality display effect.

As shown in fig. 4, a blank area is formed between two adjacent color conversion units 410 to ensure that the color conversion assembly 400 has a high transmittance to transmit ambient light. In practice, an anti-reflection layer for increasing the visible light transmittance may be disposed at a space between the color conversion units 410, which is not limited herein.

In the embodiment shown in fig. 2-4, a transparent protective cover may also be provided on the side of the color conversion assembly 400 facing away from the reflective element 300. The transparent protective cover can transmit light for image display and can protect various elements inside the near-eye display device.

FIG. 5 is a schematic cross-sectional view of a color conversion assembly according to an embodiment of the present utility model; fig. 6 is a schematic cross-sectional view of a color conversion device according to a second embodiment of the present utility model.

In the embodiment shown in fig. 2 to 4, the wavelength of the monochromatic light emitted from the display module 100 may be smaller than the wavelength of the color light emitted from the color conversion module 400 after the color conversion.

For example, the light emitting unit in the display module 100 may be an ultraviolet Micro LED chip, and the ultraviolet Micro LED chip may emit ultraviolet light. As shown in fig. 5, the color conversion assembly 400 may include a red color conversion unit 411, a green color conversion unit 412, and a blue color conversion unit 413. Wherein, the red color conversion unit 411 is used for converting incident ultraviolet light into red light, the green color conversion unit 412 is used for converting the incident ultraviolet light into green light, and the blue color conversion unit 413 is used for converting the incident ultraviolet light into blue light.

In implementation, the red color conversion unit 411, the green color conversion unit 412, and the blue color conversion unit 413 may be made of quantum dot materials. The quantum dot material is a nanoscale light excitation material, and the stimulated emission wavelength of the quantum dot material can be controlled by controlling the particle size of the quantum dot. The color conversion unit 410 is made of quantum dot material, which can effectively improve the color purity of the emergent light and is beneficial to improving the color gamut. In some embodiments, the color conversion unit 410 may also be made of a material with a color conversion function, such as a fluorescent material, which is not limited herein.

In the embodiment shown in fig. 2 to 4, the monochromatic light emitted from the display module 100 may be blue light.

For example, the light emitting unit in the display module 100 may be a blue Micro LED chip, and the blue Micro LED chip may emit blue light. As shown in fig. 6, the color conversion assembly 400 may include a red color conversion unit 411, a green color conversion unit 412, and a blue light transmission unit 414. The red conversion unit 411 is configured to convert an incident blue light into a red light, the green conversion unit 412 is configured to convert an incident blue light into a green light, and the blue light transmission unit 414 is configured to transmit the blue light.

In implementation, the red color conversion unit 411 and the green color conversion unit 412 may each use a quantum dot material or a fluorescent material. The blue light transmitting unit 414 may be made of a transparent material. Since the angles of the light emitted by the quantum dot material are random, in order to make the emission pattern of the blue light transmitting unit 414 coincide with the red color converting unit 411 and the green color converting unit 412, the blue light transmitting unit 414 may include a plurality of scattering particles, and the scattering particles may scatter the blue light incident on the blue light transmitting unit 414 and then emit the blue light, so that the emission pattern of the blue light emitted by the color converting assembly 400 is similar to the red light and the green light. In particular, the dispersion particles may be titanium dioxide, silicon oxide, or the like, and are not limited thereto.

In the embodiment shown in fig. 2 to 4, the color conversion units 410 are each disposed on a side of the substrate 420 facing the reflection unit 300. In particular, the color conversion unit 410 may be disposed on a side of the substrate 420 facing away from the reflection unit 300, which is not limited herein.

FIG. 7 is a schematic cross-sectional view of a near-to-eye display device according to an embodiment of the utility model; FIG. 8 is a schematic cross-sectional view of a near-eye display device according to an embodiment of the utility model; FIG. 9 is a schematic diagram of a cross-sectional structure of a near-eye display device according to an embodiment of the utility model; FIG. 10 is a schematic cross-sectional view of a near-eye display device according to an embodiment of the utility model; fig. 11 is a schematic cross-sectional view of a near-eye display device according to an embodiment of the utility model.

In some embodiments, as shown in fig. 7, the reflective unit 300 is a transflector. The transparent mirror is configured to receive the monochromatic light transmitted by the first lens group 200 and reflect at least a portion of the received monochromatic light toward the color conversion assembly 400. The transparent mirror also receives the color light emitted from the color conversion assembly and transmits at least a portion of the color light to a side of the transparent mirror facing away from the color conversion assembly 400, and a user views the display image from the side of the transparent mirror facing away from the color conversion assembly 400, and the color light transmitted by the transparent mirror is incident into a human eye to display the color image in the human eye.

In the embodiment shown in fig. 7, the user views the display image of the near-eye display device from the side of the reflection unit 300 away from the color conversion assembly 400, and compared with viewing the display image of the near-eye display device from the side of the color conversion assembly 400 away from the reflection unit 300, the color image generated by the color conversion assembly 400 is farther from the human eye, so that the viewing distance can be increased without increasing the volume of the near-eye display device, which is beneficial for focusing on both eyes of the user to obtain a clear display image.

In the embodiment shown in fig. 7, since the user views the display image of the near-eye display device from the side of the reflection unit 300 away from the color conversion assembly 400, when the monochromatic light transmitted by the first lens group 200 is incident on the transparent mirror, part of the monochromatic light is transmitted to the side of the transparent mirror away from the color conversion assembly 400, and the transmitted monochromatic light and the transmitted color light are incident together into the eyes of the user, so that light leakage is generated and the display effect is affected.

In view of this, in some embodiments, the reflectance of the monochromatic light transmitted by the first lens group by the transparent mirror is greater than the transmittance, so that the proportion of the monochromatic light transmitted by the transparent mirror can be reduced, and light leakage is reduced.

For example, as shown in fig. 8, the near-eye display device further includes: polarizer 600. The polarizer 600 is positioned between the display module 100 and the reflection unit 300. The polarizer 600 is used for converting the monochromatic light emitted from the display module 100 into linearly polarized light and then emitting the linearly polarized light to the reflection unit 300.

The reflection unit 300 may be a polarizing beam splitter. The polarizing beam splitter is used to reflect light having a polarization direction perpendicular to an S component of an incident surface and transmit light having a polarization direction parallel to a P component of the incident surface, so that an incident light ray can be split into two beams. When the linearly polarized light is parallel to the polarizing beam splitter at the brewster angle and the polarization direction of the incident light is perpendicular to the incident plane, the polarizing beam splitter can reflect most of the incident light, thereby reducing the transmittance to the greatest extent.

In the embodiment shown in fig. 8, after the single-color light emitted from the display module 100 is polarized by the polarizer 600, the polarization direction of the emitted linearly polarized light is perpendicular to the cross section, the first lens group 200 collimates the linearly polarized light emitted from the polarizer 600, the collimated linearly polarized light is parallel to the reflection unit 300, and the polarization directions of the linearly polarized light incident to the reflection unit 300 are perpendicular to the incident plane (cross section), so that most of the linearly polarized light incident to the reflection unit 300 is reflected by the reflection unit 300 to the color conversion unit 400, thereby minimizing the light transmitted by the reflection unit 300 and reducing light leakage. After being reflected to the color conversion assembly 400, the linearly polarized light is converted into unpolarized light by the depolarization of the color conversion unit 410, and the reflection unit 300 can transmit the P component light of the unpolarized light emitted from the color conversion unit 410, so that the P component light is incident on the eyes of the user to display an image. Since the color light emitted from the color conversion unit 410 is unpolarized light, the number of light rays transmitted and reflected by the reflection unit 300 is substantially the same for the color light emitted from the color conversion unit 410, and the brightness of the displayed color image can be ensured.

In the embodiment shown in fig. 8, the linearly polarized light polarized by the polarizer 600 may be incident on the reflection unit 300 in the form of diverging light, and since the incident light has more S component perpendicular to the incident plane than P component parallel to the incident plane, the polarizing beam splitter may also have an effect of having a higher reflectivity than the transmittance of the monochromatic light transmitted through the first lens group, thereby reducing light leakage.

In the embodiment shown in fig. 8, the polarizer 600 is located between the display module 100 and the first lens group 200. In some embodiments, the polarizer 600 may also be located between the first lens group 200 and the reflection unit 300, which is not limited herein.

In particular, polarizer 600 may be a polarizer. The polarizer may be attached to the surface of the display module 100 or to the surface of the first lens group 200. In some embodiments, the polarizer 600 may be a polarizing layer, which may be directly formed on the surface of the display module 100 or on the surface of the first lens group 200 by using a material having polarizing properties, which is not limited herein.

In some embodiments, the transparent mirror may also be a dielectric film spectroscope or a lattice metal film spectroscope, which is not limited herein. The dielectric film spectroscope realizes the regulation and control of different reflectivities and transmittances by using a thin film interference principle through a plurality of layers of dielectric films which are arranged in a laminated way. The lattice metal film spectroscope forms a metal lattice on the transparent substrate in a film plating mode and the like, and the metal lattice occupies the whole area of the transparent substrate to realize reflection and transmission with different proportions.

In some embodiments, as shown in fig. 9, the color conversion assembly 400 further includes a substrate 420, and the array of color conversion cells 410 is formed over the substrate 420. In particular, the substrate 420 is made of a transparent material, such as optical glass, optical resin, and the like. Because there is a larger space between the adjacent color conversion units 410 in the color conversion assembly 400, the ambient light outside the side of the color conversion assembly 400 facing away from the reflection unit 300 may be incident into the near-to-eye display device through the space between the adjacent color conversion units 410 in the color conversion assembly 400, and the incident ambient light and the color light emitted from the color conversion assembly 400 are partially transmitted to the eyes of the user through the reflection unit 300, so as to realize the display effect of superposition of the virtual image and the real world. In a specific implementation, the near-eye display device may be AR glasses, and the AR glasses may superimpose the virtual image in the real world, so as to achieve an augmented reality display effect.

In practice, as shown in fig. 9, the color conversion unit 410 may be disposed on a side of the substrate 420 facing the reflection unit 300 to ensure brightness of the imaging light. In some embodiments, the color conversion unit 410 may also be disposed on a side of the substrate 420 facing away from the reflection unit 300, which is not limited herein.

In the embodiment shown in fig. 9, a transparent protective cover may also be provided on the side of the color conversion assembly 400 facing away from the reflective unit 300. The transparent protective cover may transmit ambient light for AR display and may protect various elements inside the near-eye display device.

In some embodiments, as shown in fig. 10, the color conversion assembly 400 further includes a light shielding unit 430. The light shielding units 430 are located at the interval positions between the color conversion units 410, and are used for shielding light, avoiding crosstalk between outgoing light of adjacent color conversion units 410, and improving display quality. Meanwhile, the light shielding unit 430 can also prevent the ambient light outside the side of the color conversion assembly 400 facing away from the reflection unit 300 from entering the near-eye display device, so as to improve the contrast of the display image. The light shielding unit 430 may be made of a black light shielding material, and is not limited herein.

In some embodiments, as shown in fig. 10, the color conversion assembly 400 further includes a substrate 420, and the array of color conversion cells 410 is formed over the substrate 420. In particular, the substrate 420 is made of a non-transparent material, so that the ambient light outside the side of the color conversion assembly 400 facing away from the reflection unit 300 is prevented from entering the near-eye display device, and the contrast ratio of the display image is improved. In some embodiments, the substrate 420 may also be made of a transparent material, which is not limited herein.

In a specific implementation, in the embodiment shown in fig. 10, the near-eye display device may be VR glasses, and the VR glasses may present a virtual enlarged image in front of eyes of a user, so as to achieve a virtual reality display effect. As shown in fig. 10, a color conversion unit 410 may be disposed at a side of the substrate 420 facing the reflection unit 300 to ensure brightness of imaging light.

In some embodiments, as shown in fig. 11, the near-eye display device further comprises a second lens group 500. The second lens group 500 is located at a side of the reflection unit 300 facing away from the color conversion assembly 400. The second lens group 500 may further magnify the color image generated by the color conversion assembly 400, increasing the detail of the displayed image. And through setting up the second lens group 500 between reflection unit 300 and user, second lens group 500 can form the virtual image V of enlargeing in the one side that color conversion subassembly 400 deviates from second lens group 500, under the prerequisite that does not increase near-eye display device's volume, further increases the distance between virtual image V and the human eye, is favorable to the human eye to focus, promotes user's viewing experience. The specific structure of the second lens assembly 500 may refer to the content of the embodiment shown in fig. 3, and will not be described herein.

Fig. 12 is a third schematic cross-sectional view of a color conversion device according to an embodiment of the present utility model.

In the embodiment shown in fig. 7 to 11, the wavelength of the monochromatic light emitted from the display module 100 may be smaller than the wavelength of the color light emitted from the color conversion module 400 after the color conversion. In specific implementation, the arrangement manner of each color conversion unit in the color conversion assembly 400 may refer to the content of the embodiment shown in fig. 5, which is not described herein.

In the embodiment shown in fig. 7 to 11, the monochromatic light emitted from the display module 100 may also be blue light.

For example, the light emitting unit in the display module 100 may be a blue Micro LED chip, and the blue Micro LED chip may emit blue light. As shown in fig. 12, the color conversion assembly 400 may include a red color conversion unit 411, a green color conversion unit 412, and a blue light reflection unit 415. The red conversion unit 411 is used for converting incident blue light into red light, the green conversion unit 412 is used for converting incident blue light into green light, and the blue reflection unit 415 is used for receiving blue light reflected by the reflection unit 300 and reflecting the blue light again to the reflection unit 300.

In implementation, the red color conversion unit 411 and the green color conversion unit 412 may each use a quantum dot material or a fluorescent material. The blue light reflecting unit 415 may be made of a material having a reflective property. Since the angles of the light rays stimulated and emitted by the quantum dot material are random, in order to make the emission type of the blue light reflecting unit 415 coincide with the red color converting unit 411 and the green color converting unit 412, the blue light reflecting unit 415 may include a plurality of scattering particles, and the scattering particles may scatter the blue light rays incident on the blue light reflecting unit 415 and then emit the blue light rays, so that the emission type of the blue light emitted by the color converting assembly 400 is similar to red and green light. In particular, the dispersion particles may be titanium dioxide, silicon oxide, or the like, and are not limited thereto.

In the embodiment shown in fig. 1-12, the shape of the substrate of the color conversion assembly 400 is arcuate. In practical implementation, the substrate of the color conversion assembly may be a flat plate or other shapes according to practical requirements, which is not limited herein.

While preferred embodiments of the present utility model have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the utility model.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (10)

1. A near-eye display device, comprising:

the display module is used for emitting monochromatic light according to the image to be displayed; the display module comprises a plurality of light emitting units which are arranged in an array;

the first lens group is positioned on the light emitting side of the display module; the first lens group is used for amplifying a display image of the display module;

the reflecting unit is positioned at one side of the first lens group, which is away from the display module; the reflection unit is used for reflecting at least part of the monochromatic light transmitted by the first lens group;

the color conversion component is positioned on the light emitting side of the reflected light of the reflection unit; the color conversion component is used for receiving the monochromatic light reflected by the reflection unit and converting the monochromatic light into color light for emergence;

the color conversion assembly comprises a plurality of color conversion units which are arranged in an array; the interval between two adjacent color conversion units is larger than the interval between two adjacent light emitting units.

2. The near-eye display device of claim 1 wherein the reflecting unit is a transflector; the transparent reflector is used for reflecting at least part of the monochromatic light rays transmitted by the first lens group to the color conversion assembly and receiving and transmitting at least part of the colored light rays emitted by the color conversion assembly;

the color light rays transmitted by the transparent reflecting mirror are used for being incident into human eyes to image.

3. The near-eye display device of claim 2 wherein the reflectance of the monochromatic light transmitted by the first lens group by the transflector is greater than the transmittance.

4. A near-eye display device of claim 3 wherein the transflector is a polarizing beamsplitter;

the near-eye display device further includes:

a polarizer located between the display module and the reflection unit; the polarizer is used for converting the monochromatic light emitted by the display module into linearly polarized light.

5. A near-eye display device as defined in claim 2, further comprising:

a second lens group positioned on a side of the transflector facing away from the color conversion assembly; the second lens group is used for amplifying an image formed by the colored light rays transmitted by the transparent reflector.

6. The near-eye display device of claim 2, wherein the color conversion assembly further comprises: a light shielding unit; the light shielding units are positioned at intervals among the color conversion units.

7. The near-eye display device of claim 2, wherein the wavelength of the monochromatic light is less than the wavelength of the colored light;

the color conversion unit comprises a red color conversion unit, a green color conversion unit and a blue color conversion unit; the red color conversion unit is used for converting the monochromatic light into red light, the green color conversion unit is used for converting the monochromatic light into green light, and the blue color conversion unit is used for converting the monochromatic light into blue light.

8. The near-eye display device of claim 2, wherein the monochromatic light is blue light;

the color conversion unit comprises a red color conversion unit, a green color conversion unit and a blue light reflection unit; the red conversion unit is used for converting the blue light into red light, the green conversion unit is used for converting the blue light into green light, and the blue reflection unit is used for reflecting the blue light.

9. A near-eye display device as claimed in any one of claims 1 to 8, wherein the monochromatic light rays transmitted by the first lens group are collimated light rays.

10. The near-eye display device of any one of claims 1 to 8, wherein the light emitting unit is a Micro LED chip.