Near-to-eye display device

Abstract

The invention discloses a near-to-eye display device, which comprises at least two light-emitting elements, a light combination assembly and at least one color conversion layer, wherein the light combination assembly is positioned on an emergent light path of each light-emitting element; wherein at least one of the light-emitting elements is a monochromatic light-emitting element and is used for emitting monochromatic light; the light combining assembly is used for combining the incident light; one color conversion layer corresponds to one single-color light-emitting element, is positioned between the corresponding single-color light-emitting element and the light incident surface of the light combination component, and is used for receiving emergent light of the single-color light-emitting element and performing color conversion. According to the near-to-eye display device disclosed by the invention, full-color display can be realized under the condition that a red light Micro LED chip is not used, and the volume production capability and the service life of the near-to-eye display device based on the Micro LED display can be improved.

Description

Technical Field

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

[0002] Near-Eye Display (NED), also known as head-mounted display or wearable display, can create virtual images in the field of view of one eye or two eyes. Near-Eye Display is a hot topic in current research, including virtual reality (VR) display in the form of helmets and augmented reality (AR) display in the form of smart glasses. Near-Eye Display can provide people with an unprecedented sense of interaction and has important application value in many fields such as telemedicine, industrial design, education, military virtual training, and entertainment.

[0003] Near-eye display devices can use micro light emitting diode (LED) displays as image sources, thereby reducing the size of near-eye display devices and improving the user's wearing experience. Micro LED displays use Micro LED chips to emit light to display images. Due to the difficulty in manufacturing red Micro LED chips, low luminous efficiency, and poor reliability, these factors have become factors restricting the mass production of full-color Micro LED near-eye display devices. Summary of the invention

[0004] An embodiment of the present invention provides a near-eye display device, including:

[0005] At least two light-emitting elements; at least one of the light-emitting elements is a monochromatic light-emitting element for emitting monochromatic light;

[0006] The light combining component is located on the outgoing light path of each light emitting element; the light combining component is used to combine the incident light;

[0007] At least one color conversion layer, one color conversion layer corresponds to a monochromatic light-emitting element; the color conversion layer is located between the corresponding monochromatic light-emitting element and the light incident surface of the light combining component, and is used to receive the output light of the monochromatic light-emitting element and perform color conversion.

[0008] The near-eye display device provided by the embodiment of the present invention can achieve full-color display without using red light Micro LED chips, thereby avoiding the problems of difficult process manufacturing, low luminous efficiency and poor reliability of red light Micro LED chips, which is conducive to improving the mass production capacity and service life of near-eye display devices based on Micro LED displays.

[0009] In some embodiments of the present invention, the number of light-emitting elements is two, including a multicolor light-emitting element and a monochromatic light-emitting element; the multicolor light-emitting element is used to emit at least blue light and green light; the monochromatic light-emitting element is used to emit non-red light; the color conversion layer is located between the monochromatic light-emitting element and the light incident surface of the light combining component, and is used to convert the light emitted by the monochromatic light-emitting element into red light, thereby reducing the number of light-emitting elements and reducing the volume of the display device.

[0010] In some embodiments of the present invention, the number of light-emitting elements is three; each light-emitting element is a monochrome light-emitting element, and the color of light emitted by each light-emitting element is the same, which can reduce the difficulty and cost of manufacturing the light-emitting elements.

[0011] The number of color conversion layers is at least two; each color conversion layer is located between the corresponding monochromatic light-emitting element and the light incident surface of the light combining component, and is used to receive the light emitted by the corresponding monochromatic light-emitting element and perform color conversion so that the emitted light of the light combining component includes red light, green light and blue light.

[0012] In some embodiments of the present invention, the light emitted by the light-emitting element is blue light; the number of color conversion layers is two, and each color conversion layer is located between any two light-emitting elements and the light incident surface of the light-combining component; wherein, one color conversion layer is used to convert blue light into green light, and the other color conversion layer is used to convert blue light into red light, which can reduce the number of color conversion layers, reduce the production cost and the volume of the display device.

[0013] In some embodiments of the present invention, the light emitted by the light-emitting element is ultraviolet light; the number of color conversion layers is three, and each color conversion layer is respectively located between each light-emitting element and the light incident surface of the light-combining component; among them, one color conversion layer is used to convert ultraviolet light into green light, one color conversion layer is used to convert ultraviolet light into red light, and one color conversion layer is used to convert ultraviolet light into blue light.

[0014] In some embodiments of the present invention, the number of light-emitting elements is three, and the number of color conversion layers is one; each light-emitting element is a monochromatic light-emitting element, namely, a first monochromatic light-emitting element, a second monochromatic light-emitting element and a third monochromatic light-emitting element; wherein the first monochromatic light-emitting element is used to emit blue light, the second monochromatic light-emitting element is used to emit green light, and the third monochromatic light-emitting element is used to emit monochromatic light other than red light; the color conversion layer is located between the third monochromatic light-emitting element and the light combining component, and is used to convert the light emitted by the third monochromatic light-emitting element into red light.

[0015] In some embodiments of the present invention, the light combining component is a light combining prism; the light combining prism is used to receive light emitted by the light emitting element and / or the color conversion layer, and fuse it into three primary color lights for emission, thereby generating a full-color image.

[0016] The light-combining prism includes a first prism, a second prism, a third prism and a fourth prism; the oblique surfaces of the first prism, the second prism, the third prism and the fourth prism are combined in pairs; wherein the first prism is located on the opposite side of the third prism, and the second prism is located on the opposite side of the fourth prism;

[0017] The bottom surface of the first prism is the light emitting surface of the light combining component, the bottom surfaces of the second prism, the third prism and the fourth prism are the three light incident surfaces of the light combining component, and each light emitting element is arranged in one-to-one correspondence with each light incident surface;

[0018] A first transflective film is disposed between the first prism and the second prism, and the first transflective film is used to reflect red light and transmit green light and blue light;

[0019] A second transflective film is disposed between the second prism and the third prism, and the second transflective film is used to reflect blue light and transmit green light;

[0020] A third transflective film is disposed between the third prism and the fourth prism, and the third transflective film is used to reflect red light and transmit green light;

[0021] A fourth transflective film is arranged between the fourth prism and the first prism, and the fourth transflective film is used for reflecting blue light and transmitting red light and green light.

[0022] In some embodiments of the present invention, the color conversion layer is attached to the light incident surface of the light combining component to improve the structural stability.

[0023] In some embodiments of the present invention, the near-eye display device further includes: an anti-reflection and anti-reflection film located on the surface of the light incident surface of the light combining component to improve light utilization.

[0024] In some embodiments of the present invention, the near-eye display device further includes: a filter layer, located between the color conversion layer and the light incident surface of the light combining component, for improving color purity and enhancing display quality.

[0025] In some embodiments of the present invention, the monochromatic light-emitting element includes light-emitting units arranged in an array; the color conversion layer includes color conversion units arranged in an array, one color conversion unit corresponds to one light-emitting unit, and the color conversion unit is used to receive light from the corresponding light-emitting unit and perform color conversion;

[0026] The color conversion layer also includes a black matrix located at intervals between the color conversion units to reduce color crosstalk.

[0027] In some embodiments of the present invention, a collimation structure is provided between the monochromatic light emitting element and the color conversion layer to reduce color crosstalk.

[0028] In some embodiments of the present invention, the light emitting element is a Micro LED display. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings introduced below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0030] Figure 1 It is one of the cross-sectional structural schematic diagrams of a near-eye display device in the related art;

[0031] Figure 2 The second schematic diagram of the cross-sectional structure of a near-eye display device in the related art;

[0032] Figure 3 One of the cross-sectional structural schematic diagrams of the near-eye display device provided by an embodiment of the present invention;

[0033] Figure 4 A second schematic cross-sectional structural diagram of a near-eye display device provided by an embodiment of the present invention;

[0034] Figure 5 A third schematic diagram of a cross-sectional structure of a near-eye display device provided by an embodiment of the present invention;

[0035] Figure 6 A schematic diagram of the cross-sectional structure of a light combining assembly provided in an embodiment of the present invention;

[0036] Figure 7 A fourth schematic cross-sectional structural diagram of a near-eye display device provided in an embodiment of the present invention;

[0037] Figure 8 A fifth schematic diagram of a cross-sectional structure of a near-eye display device provided in an embodiment of the present invention;

[0038] Fig. 9 A sixth schematic diagram of the cross-sectional structure of the near-eye display device provided by an embodiment of the present invention;

[0039] Fig.10 A seventh schematic diagram of a cross-sectional structure of a near-eye display device provided in an embodiment of the present invention;

[0040] Fig.11 An eighth schematic diagram of a cross-sectional structure of a near-eye display device provided by an embodiment of the present invention;

[0041] Fig.12 A ninth schematic diagram of a cross-sectional structure of a near-eye display device provided in an embodiment of the present invention;

[0042] Fig.13A tenth schematic diagram of a cross-sectional structure of a near-eye display device provided by an embodiment of the present invention;

[0043] Fig.14 The eleventh cross-sectional structural schematic diagram of the near-eye display device provided by an embodiment of the present invention;

[0044] Fig.15 The twelfth cross-sectional structural schematic diagram of the near-eye display device provided by an embodiment of the present invention;

[0045] Fig.16 This is a thirteenth schematic diagram of the cross-sectional structure of the near-eye display device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described below with reference to the accompanying drawings and examples. However, the exemplary embodiments can be implemented in various forms and should not be understood as being limited to the embodiments described herein; on the contrary, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concepts of the exemplary embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and thus their repeated descriptions will be omitted. The words expressing position and direction described in the present invention are all explained using the accompanying drawings as examples, but changes can be made as needed, and the changes made are all included in the scope of protection of the present invention. The drawings of the present invention are only used to illustrate the relative position relationship and do not represent the true proportions.

[0047] Near-Eye Display (NED), also known as head-mounted display or wearable display, can create virtual images in the field of view of one eye or two eyes. Near-Eye Display is a hot topic in current research, including virtual reality (VR) display in the form of helmets and augmented reality (AR) display in the form of smart glasses. Near-Eye Display can provide people with an unprecedented sense of interaction and has important application value in many fields such as telemedicine, industrial design, education, military virtual training, and entertainment.

[0048] Near-eye display devices can use micro light emitting diode (LED) displays as image sources. Micro LED displays have the characteristics of small size, high resolution, high brightness, high contrast and low power consumption. They can reduce the size of near-eye display devices and improve the user's wearing experience.

[0049] Figure 1 It is one of the cross-sectional structural schematic diagrams of a near-eye display device in the related art; Figure 2This is the second schematic diagram of the cross-sectional structure of a near-eye display device in the related art.

[0050] To achieve full-color display, the relevant technologies mainly include a full-color solution that uses a three-primary-color Micro LED display as an image source and a full-color solution that uses three monochrome Micro LED displays to combine light through a light combining component.

[0051] like Figure 1 As shown, the three-primary color Micro LED display mainly includes a driving backplane 110 and a blue light Micro LED chip 211, a red light Micro LED chip 212 and a green light Micro LED chip 213 arranged on the driving backplane 110 in a set manner. The driving backplane 110 is used to provide a driving signal to drive the red light Micro LED chip 211, the green light Micro LED chip 212 and the blue light Micro LED chip 213 to emit light in a set manner, thereby achieving full-color display.

[0052] like Figure 2 As shown, a full-color solution using a light-combining component includes a red Micro LED display 210 for emitting red light, a green Micro LED display 220 for emitting green light, and a blue Micro LED display 230 for emitting blue light, wherein the red Micro LED display 210 uses a red Micro LED chip as a light-emitting unit, the green Micro LED display uses a green Micro LED chip as a light-emitting unit, and the blue Micro LED display uses a blue Micro LED chip as a light-emitting unit. The light emitted by the red Micro LED display 210, the green Micro LED display 220, and the blue Micro LED display 230 are combined by the light-combining component to generate a full-color image that is emitted from the light-emitting surface of the light-combining component 300.

[0053] However, whether using a three-primary-color Micro LED display as the image source or a light-combining component, red Micro LED chips are required. Due to the difficulty in manufacturing red Micro LED chips, low luminous efficiency and poor reliability, the near-eye display device based on the Micro LED display has a short lifespan and is difficult to mass-produce.

[0054] In view of this, an embodiment of the present invention provides a near-eye display device based on a Micro LED display, which can solve the above problems.

[0055] Figure 3One of the cross-sectional structural schematic diagrams of the near-eye display device provided by an embodiment of the present invention; Figure 4 The second schematic diagram of the cross-sectional structure of the near-eye display device provided in an embodiment of the present invention.

[0056] In the embodiment of the present invention, Figure 3 As shown, the near-eye display device includes: a light-emitting element 200, a light-combining component 300 and a color conversion layer 400.

[0057] The light-emitting element 200 is used to emit light and provide an image source. In an embodiment of the present invention, a single light-emitting element 200 can emit monochromatic light to display a monochromatic image, or a single light-emitting element 200 can emit images of at least two colors to display a color image. In a specific implementation, the light-emitting element 200 can be a Micro LED display, which uses a Micro LED chip as a light-emitting unit. The Micro LED chip is a technology that miniaturizes and matrices light-emitting diodes (Light Emittng Diode, LED for short), and has the characteristics of small size, high resolution, high brightness, high contrast and low power consumption. In some embodiments, the light-emitting element 200 can also use other displays, such as a Micro Organic Light Emitting Diode (Micro OLED) display, etc., which is not limited here.

[0058] In an embodiment of the present invention, the near-eye display device includes at least two light-emitting elements 200 , wherein at least one light-emitting element 200 is a monochromatic light-emitting element 201 for emitting monochromatic light.

[0059] The light combining assembly 300 is located on the light emission path of each light emitting element 200. Figure 3 As shown, the light combining component 300 includes a light incident surface 301 and a light emitting surface 302. Each light emitting element 200 can be arranged relative to the light incident surface 301 of the light combining component 300. The light emitting side of each light emitting element 200 faces the light incident surface 301 of the light combining component 300, which is not limited here.

[0060] The color conversion layer 400 is used to receive light and perform color conversion. The color conversion layer 400 includes materials that can perform color conversion, such as quantum dot materials or fluorescent materials, which are not limited here.

[0061] In an embodiment of the present invention, the near-eye display device may include at least one color conversion layer 400 , one color conversion layer 400 corresponds to one monochromatic light-emitting element 201 , and the color conversion layer 400 is located between the corresponding monochromatic light-emitting element 201 and the light incident surface 301 of the light combining component 300 .

[0062] like Figure 3As shown, the light emitted by the light emitting element 200 with a color conversion layer 400 disposed on the light emitting side is incident on the light combining component 300 from the light incident surface 301 after undergoing color conversion by the color conversion layer 400, and the light emitted by the light emitting element 200 without a color conversion layer 400 disposed on the light emitting side is incident on the light combining component 300 from the light incident surface 301 without undergoing color conversion, and the light combining component 300 receives the light directly emitted by the light emitting element 200 and / or the light emitted by the light emitting element 200 and undergoing color conversion by the color conversion layer, and after combining the incident light, emits it from the light emitting surface 302. When the light directly emitted by the light emitting element 200 and / or the light undergoing color conversion by the color conversion layer 400 received by the light combining component 300 includes red light, green light and blue light, it can be used to display a full-color image, thereby achieving full-color display.

[0063] In the near-eye display device provided by the embodiment of the present invention, a light-emitting element for emitting red light may not be separately provided. Instead, a color conversion layer is provided on the light-emitting side of the monochromatic light-emitting element to convert the light emitted by the monochromatic light-emitting element into red light for image display of the near-eye display device, thereby realizing full-color display. In specific implementation, the light-emitting element may adopt a Mciro LED chip. Since the red Mciro LED chip does not need to be used, the problems of difficult manufacturing process, low luminous efficiency and poor reliability of the red Mciro LED chip can be avoided, which is conducive to improving the mass production capacity and service life of the near-eye display device based on the Micro LED display.

[0064] In some embodiments, Figure 4 As shown, the number of light-emitting elements 200 in the near-eye display device is two, including a multi-color light-emitting element 202 and a monochromatic light-emitting element 201 .

[0065] For example, the multicolor light-emitting element 202 can be used to emit light of at least two colors, such as blue light and green light, and the monochromatic light-emitting element 201 can be used to emit monochromatic light other than red light, such as ultraviolet light, blue light or green light. The near-eye display device includes a color conversion layer 400. The color conversion layer 400 is used to convert ultraviolet light, blue light or green light emitted by the monochromatic light-emitting element 201 into red light. The blue light and green light emitted by the multicolor light-emitting element 202 are not subjected to color conversion, and are directly incident on the light combining component from the light incident surface of the light combining component 300. The monochromatic light emitted by the monochromatic light-emitting element 201 is converted into red light by the color conversion layer 400, and is incident on the light combining component from the light incident surface of the light combining component 300, and is mixed with the blue light and the green light, and is emitted from the light exit surface 302 of the light combining component 300, thereby displaying a full-color image. In a specific implementation, such as Figure 4As shown, the light combining component 300 may include two identical right-angle prisms, both of which include an inclined surface, and the inclined surfaces of the two right-angle prisms are mutually matched to form a rectangular parallelepiped structure, and a transflective layer 303 is also included between the inclined surfaces of the two right-angle prisms, and the transflective layer 303 is used to reflect the blue light and green light emitted by the multi-color light-emitting element 202, and transmit the red light emitted by the monochromatic light-emitting element 201 after color conversion by the color conversion layer 400. In some embodiments, the light combining component 300 may also adopt other structures, as long as it can play the same role, which is not limited here.

[0066] In a specific implementation, the multicolor light-emitting element 202 includes a blue light Micro LED chip for emitting blue light and a green light LED chip for emitting green light, and the monochrome light-emitting element 201 includes an ultraviolet light MicroLED chip for emitting ultraviolet light, a blue light Micro LED chip for emitting blue light, or a green light MicroLED chip for emitting green light. In addition, the multicolor light-emitting element 202 and the monochrome light-emitting element 201 can also be used to emit light of other colors, as long as full-color display can be achieved, without limitation here. The near-eye display device uses a combination of a multicolor light-emitting element and a monochrome light-emitting element, which can reduce the number of light-emitting elements and reduce the volume of the near-eye display device.

[0067] Since the monochromatic light-emitting element only includes a Micro LED chip for emitting light of one color, the manufacturing process is simpler than that of the multi-color light-emitting element and the application is more extensive. In some embodiments, the light-emitting elements 200 in the near-eye display device can all be monochromatic light-emitting elements.

[0068] Figure 5 The third schematic diagram of the cross-sectional structure of the near-eye display device provided by an embodiment of the present invention is as follows: Figure 6 A schematic diagram of the cross-sectional structure of a light combining assembly provided in an embodiment of the present invention; Figure 7 The fourth schematic diagram of the cross-sectional structure of the near-eye display device provided in an embodiment of the present invention.

[0069] In some embodiments, Figure 5 and Figure 7 As shown, the near-eye display device includes three light-emitting elements, all of which are monochromatic light-emitting elements 201, and the colors of the light emitted by the three monochromatic light-emitting elements 201 are the same. The near-eye display device uses the same type of monochromatic light-emitting elements 201, which can reduce the production cost and maintenance cost of the monochromatic light-emitting elements 201.

[0070] In some embodiments, Figure 5As shown, the light emitted by the three monochromatic light-emitting elements 201 is blue light, and there are two color conversion layers 400, namely the first color conversion layer 410 and the second color conversion layer 420. Each color conversion layer 400 is located between the corresponding monochromatic light-emitting element 201 and the light incident surface of the light combining component 300. Among them, the first color conversion layer 410 is used to receive the blue light emitted by the monochromatic light-emitting element 201 and convert it into green light, and the second color conversion layer 420 is used to receive the blue light emitted by the monochromatic light-emitting element 201 and convert it into red light. The three monochromatic light-emitting elements 201 in the near-eye display device all emit blue light. Since blue, as one of the three primary colors, can be used to form a full-color image, the light-emitting side of at least one monochromatic light-emitting element 201 does not need to be provided with a color conversion layer, which can reduce the number of color conversion layers in the near-eye display device, which is conducive to reducing costs and reducing the difficulty and volume of manufacturing the near-eye display device.

[0071] For example, if Figure 5 As shown, the three monochromatic light-emitting elements 201 are respectively the first monochromatic light-emitting element 2011, the second monochromatic light-emitting element 2012 and the third monochromatic light-emitting element 2013, wherein the first color conversion layer 410 corresponds to the second monochromatic light-emitting element 2012, the second color conversion layer 420 corresponds to the third monochromatic light-emitting element 2013, the first color conversion layer 410 can be located between the second monochromatic light-emitting element 2012 and the light incident surface 301 of the light combining component, the second color conversion layer 420 can be located between the third monochromatic light-emitting element 2013 and the light incident surface 301 of the light combining component, the light emitted by the first monochromatic light-emitting element 2011, the first color conversion layer 410 and the second color conversion layer 420 is incident on the light combining component, and after being combined by the light combining component, the emitted light of the light combining component can include red light, green light and blue light, thereby realizing full-color display. According to actual conditions, the first color conversion layer 410 and the second color conversion layer 420 may also be arranged in other ways, such as being arranged between any two light-emitting elements 200 and the light-incident surfaces of the light-combining component 300, which is not limited here.

[0072] In some embodiments, Figure 5 and Figure 6 As shown, the light combining component 300 may be a light combining prism. The light combining prism may include a first prism 310, a second prism 320, a third prism 330, and a fourth prism 340, and the inclined surfaces of the first prism 310, the second prism 320, the third prism 330, and the fourth prism 340 are matched in pairs. In a specific implementation, the first prism 310, the second prism 320, the third prism 330, and the fourth prism 340 may all be isosceles right-angle prisms. Each isosceles right-angle prism includes two right-angled surfaces and a bottom surface, and the right-angled surfaces of the first prism 310, the second prism 320, the third prism 330, and the fourth prism 340 are matched in pairs to form a rectangular parallelepiped structure, which is not limited here.

[0073] The first prism 310 is located on the opposite side of the third prism 330, and the second prism 320 is located on the opposite side of the fourth prism 340. The bottom surface of the first prism 310 is the light emitting surface 302 of the light combining assembly, and the bottom surfaces of the second prism 320, the third prism 330 and the fourth prism 340 are the light incident surfaces 301 of the light combining assembly 300, which are the first light incident surface 3011, the second light incident surface 3012 and the third light incident surface 3013 respectively.

[0074] like Figure 5 As shown, each light-emitting element is disposed in one-to-one correspondence with each light-entering surface. For example, the first monochromatic light-emitting element 2011 is disposed relative to the first light-entering surface 3011, the second monochromatic light-emitting element 2012 is disposed relative to the second light-entering surface 3012, and the third monochromatic light-emitting element 2013 is disposed relative to the third light-entering surface 3013. The first color conversion layer 410 is located between the bottom surface of the third prism 330 and the light-emitting element, that is, between the second light-entering surface 3012 and the second monochromatic light-emitting element 2012; the second color conversion layer 420 is located between the bottom surface of the fourth prism 340 and the light-emitting element, that is, between the third light-entering surface 3013 and the third monochromatic light-emitting element 2013.

[0075] like Figure 6 As shown, a first transflective film 311 is disposed between the inclined surfaces of the first prism 310 and the second prism 320. The first transflective film 311 is used to reflect the red light emitted by the second color conversion layer 420, and transmit the blue light emitted by the first monochromatic light emitting element 2011 and the green light emitted by the first color conversion layer 410. The first transflective film 311 may be a reflection-increasing and transmission-reducing film, which is used to increase the reflectivity of the red light and reduce its transmittance, so that the reflectivity of the red light is greater than the transmittance.

[0076] A second transflective film 321 is disposed between the inclined surfaces of the second prism 320 and the third prism 330. The second transflective film 321 is used to reflect the blue light emitted by the first monochromatic light emitting element 2011 and transmit the green light emitted by the first color conversion layer 410. The second transflective film 321 may be a reflection-increasing and transmission-reducing film, which is used to increase the reflectivity of the blue light and reduce its transmittance, so that the reflectivity of the blue light is greater than the transmittance.

[0077] A third transflective film 331 is disposed between the third prism 330 and the fourth prism 340. The third transflective film 331 is used to reflect the red light emitted from the second color conversion layer 420 and transmit the green light emitted from the first color conversion layer 410. The third transflective film 331 may be a reflection-increasing and transmission-reducing film, which is used to increase the reflectivity of the red light and reduce its transmittance, so that the reflectivity of the red light is greater than the transmittance.

[0078] A fourth transflective film 341 is disposed between the fourth prism 340 and the first prism 310. The fourth transflective film 341 is used to reflect the blue light emitted by the first monochromatic light emitting element 2011, and transmit the green light emitted by the first color conversion layer 410 and the red light emitted by the second color conversion layer 420. The fourth transflective film 341 may be a reflection-increasing and transmission-reducing film, which is used to increase the reflectivity of the blue light and reduce its transmittance, so that the reflectivity of the blue light is greater than the transmittance.

[0079] In some embodiments, Figure 7 As shown, the light emitted by the three monochromatic light emitting elements 201 is ultraviolet light, and the number of color conversion layers 400 is 3, namely the first color conversion layer 410, the second color conversion layer 420 and the third color conversion layer 430, and each color conversion layer 400 is respectively located between each light emitting element 200 and the light incident surface of the light combining component 300. Among them, the arrangement of the first color conversion layer 410 and the second color conversion layer 420 can be different from Figure 5 The third color conversion layer 430 is the same as the embodiment shown, and is located between the first monochromatic light-emitting element 2011 and the light incident surface of the light combining component 300, and is used to receive the ultraviolet light emitted by the first monochromatic light-emitting element 2011, and convert it into blue light before being incident on the light combining component 300. In some embodiments, the first color conversion layer 410, the second color conversion layer 420, and the third color conversion layer 430 can also be arranged in other orders, which are not limited here. The three monochromatic light-emitting elements 201 in the near-eye display device all emit ultraviolet light, which has a shorter wavelength and higher excitation energy, and can excite light with higher purity and brightness.

[0080] Figure 8 The fifth schematic diagram of the cross-sectional structure of the near-eye display device provided in an embodiment of the present invention.

[0081] In some embodiments, Figure 8 As shown, the near-eye display device includes three light-emitting elements, all of which are monochromatic light-emitting elements 201, and at least two of the three monochromatic light-emitting elements 201 emit light of different colors. The number of color conversion layers 400 can be reduced, and the volume of the near-eye display device can be reduced.

[0082] For example, the three monochromatic light-emitting elements 201 may include a first monochromatic light-emitting element 2011, a second monochromatic light-emitting element 2012, and a third monochromatic light-emitting element 2013, wherein the first monochromatic light-emitting element 2011 may be used to emit blue light, the second monochromatic light-emitting element 2012 may be used to emit green light, and the third monochromatic light-emitting element 2013 may be used to emit monochromatic light other than red light, for example, ultraviolet light, blue light, or green light. The near-eye display device includes a color conversion layer 400, which is located between the third monochromatic light-emitting element 2013 and the light combining component, and is used to convert the light emitted by the third monochromatic light-emitting element 2013 into red light, and emit it toward the light incident surface 301 of the light combining component. The blue light emitted by the first monochromatic light-emitting element 2011, the green light emitted by the second monochromatic light-emitting element 2012, and the red light emitted by the color conversion layer 400 are merged in the light combining component, and a full-color image is generated and then emitted from the light emitting surface 302 of the light combining component. In a specific implementation, the structure of the light combining component may be the same as that of the first monochromatic light-emitting element 2011, the green light emitted by the second monochromatic light-emitting element 2012, and the red light emitted by the color conversion layer 400. Figure 5 and Figure 7 The structures of the light combining components in the illustrated embodiments are the same and are not limited here.

[0083] Fig. 9 The sixth schematic diagram of the cross-sectional structure of the near-eye display device provided by an embodiment of the present invention is as follows: Fig.10 FIG. 7 is a schematic diagram of the cross-sectional structure of the near-eye display device provided in an embodiment of the present invention.

[0084] In some embodiments, Fig. 9 As shown, the color conversion layer 400 is attached to the light incident surface 301 of the light combining component 300 and supported by the light combining component, thereby improving the structural stability. In a specific implementation, the color conversion layer 400 can be formed directly on the light incident surface 301 of the light combining component 300 by inkjet printing or the like using a quantum dot mixed glue, a fluorescent powder mixed glue, etc., or attached to the light incident surface 301 of the light combining component 300 by a film having a color conversion function such as a quantum dot film or a fluorescent film, which is not limited here. In a specific implementation, before making the color conversion layer 400, the surface of the light incident surface 301 of the light combining component 300 can also be treated with plasma to improve the adhesion performance.

[0085] In some embodiments, Fig.10 As shown, the light emitting element 200 can also be directly attached to the light incident surface 301 of the light combining component 300 or the color conversion layer 400, thereby reducing the volume of the near-eye display device. Figure 7Taking the light combining component 300 shown as an example, in a specific implementation, the first monochromatic light emitting element 2011, the third color conversion layer 430 and the second prism 320 can be bonded respectively, the second monochromatic light emitting element 2012, the first color conversion layer 410 and the third prism 330 can be bonded, and the third monochromatic light emitting element 2013, the second color conversion layer 420 and the fourth prism 340 can be bonded, and then the first prism 310, the second prism 320, the third prism 330 and the fourth prism 340 can be bonded together. In some implementations, the first prism 310, the second prism 320, the third prism 330 and the fourth prism 340 can be bonded together first, and then the first monochromatic light-emitting element 2011, the third color conversion layer 430 and the second prism 320 can be bonded together, the second monochromatic light-emitting element 2012, the first color conversion layer 410 and the third prism 330 can be bonded together, and the third monochromatic light-emitting element 2013, the second color conversion layer 420 and the fourth prism 340 can be bonded together, so as to reduce the difficulty of alignment, which is not limited here.

[0086] Fig.11 The eighth schematic diagram of the cross-sectional structure of the near-eye display device provided in an embodiment of the present invention.

[0087] In some embodiments, Fig.11 As shown, the near-eye display device also includes: an anti-reflection film 500. The anti-reflection film 500 is located on the surface of the light incident surface 301 of the light combining component 300. The anti-reflection film 500 is used to increase the transmittance of the light emitted by the light emitting element 200 or the light emitted by the color conversion layer 400, which is incident on the light combining component 300, thereby improving the light utilization rate. The anti-reflection film 500 can be made by evaporating materials such as titanium oxide onto the light incident surface of the light combining component 300 through a vacuum coating process. Figure 5 Taking the light combining assembly shown in the figure as an example, before the first prism 310, the second prism 320, the third prism 330 and the fourth prism 340 are aligned, the second prism 320, the third prism 330 and the fourth prism 340 can be coated with an anti-reflection film. For example, when the second prism 320 is coated with an anti-reflection film 500, each surface except the bottom surface of the second prism 320 can be shielded by a mask, and then a certain thickness of titanium oxide material is evaporated on the bottom surface of the second prism 320 to form the anti-reflection film 500. The specific material and thickness of the anti-reflection film 500 can be adjusted according to the wavelength of the light transmitted therethrough to achieve an anti-reflection effect on light of a specific wavelength, which is not limited here.

[0088] Fig.12 The ninth schematic diagram of the cross-sectional structure of the near-eye display device provided in an embodiment of the present invention.

[0089] In some embodiments, Fig.12As shown, the near-eye display device also includes a filter layer 600. The filter layer 600 is located between the color conversion layer 400 and the light incident surface 301 of the light combining component 300. The filter layer 600 is used to filter out stray light. For example, the light emitted by the monochromatic light emitting element 201 can be blue light, and the blue light is converted into red light after color conversion by the color conversion layer 400. The filter layer 600 can filter out light other than red light, such as blue light that has not undergone color conversion, etc., thereby improving the purity of the light incident on the light combining component 300. In specific implementation, such as Fig.11 As shown, if the surface of the light incident surface 301 of the light combining component 300 is further provided with an anti-reflection film 500, the filter layer 600 can be located between the anti-reflection film 500 and the color conversion layer 400, which is not limited here.

[0090] Fig.13 A tenth schematic diagram of a cross-sectional structure of a near-eye display device provided by an embodiment of the present invention; Fig.14 This is an eleventh schematic diagram of the cross-sectional structure of a near-eye display device provided in an embodiment of the present invention.

[0091] In some embodiments, Fig.13 and Fig.14 As shown, the monochromatic light-emitting element 201 includes light-emitting units 2001 arranged in an array, wherein the light-emitting unit 2001 may be a Micro LED chip. The color conversion layer 400 includes a plurality of color conversion units 410 arranged in an array, wherein one color conversion unit 410 corresponds to one light-emitting unit 2001, and the color conversion unit 410 is used to receive light from the corresponding light-emitting unit 2001 and perform color conversion. The color conversion unit 410 may be made of a material having a color conversion function such as a quantum dot material or a fluorescent material, which is not limited here.

[0092] The color conversion layer 400 further includes a black matrix 420, which is located at intervals between the color conversion units 410. The black matrix 420 can be made of a black light-shielding material to reduce light crosstalk between adjacent light-emitting units 2001, making the display clearer.

[0093] In some embodiments, Fig.13 and Fig.14 As shown, a collimating structure 700 may be further provided between the monochromatic light emitting element 201 and the color conversion layer 400. Since the light emitted by the Micro LED chip is usually divergent light, the collimating structure 700 has the function of focusing and collimating the light emitted by the Micro LED chip, which can reduce the divergence of the light emitted by the light emitting unit 2001, further avoid light crosstalk between adjacent light emitting units 2001, and improve the clarity of the displayed image.

[0094] In some embodiments, Fig.13 As shown, the collimating structure 700 can be a lens group arranged between the monochromatic light-emitting element 201 and the color conversion layer 400, and the lens group includes at least one lens stacked in a horizontal direction. The light emitted by each light-emitting unit 2001 of the monochromatic light-emitting element 201 is collimated by the lens group.

[0095] In some embodiments, Fig.14 As shown, the collimating structure 700 may include a plurality of lens groups disposed between the monochromatic light emitting element 201 and the color conversion layer 400, one lens group corresponding to one light emitting unit 2001, and used to collimate the light emitted by the corresponding light emitting unit 200. Each lens group includes at least one lens stacked in a horizontal direction, which is not limited here.

[0096] During specific implementation, the collimating structure 700 may also be other structures that can achieve the same function, which is not limited here.

[0097] Fig.15 The twelfth cross-sectional structural schematic diagram of the near-eye display device provided by an embodiment of the present invention; Fig.16 This is a thirteenth schematic diagram of the cross-sectional structure of the near-eye display device provided in an embodiment of the present invention.

[0098] In the embodiment of the present invention, the near-eye display device may be an augmented reality (AR) display device, such as AR glasses, or a virtual reality (VR) display device, such as VR glasses, etc., which is not limited here.

[0099] In some embodiments, Fig.15As shown, the near-eye display device also includes an optical waveguide 800. The optical waveguide 800 includes a first coupling structure 801, a second coupling structure 802, a coupling structure 803 and an optical waveguide body 804, and the optical waveguide body 804 is used to connect the first coupling structure 801, the second coupling structure 802 and the coupling structure 803. Among them, the first coupling structure 801 is located on the light-emitting side of the light-emitting surface 302 of the light-combining component, and the light emitted from the light-emitting surface 302 of the light-combining component enters the optical waveguide body 804 through the first coupling structure 801, and after propagation through the optical waveguide body 804, it is emitted to the user's eyes through the coupling structure 803, presenting a virtual image generated by the light-emitting element. The second coupling structure 802 is used to receive ambient light, and transmit it to the coupling structure 803 through the optical waveguide body 804, and emit it to the user's eyes, presenting an image of the real environment. The virtual image generated by the light-emitting element and the image of the real environment are merged in the user's eyes, thereby achieving an augmented reality (AR) display effect. In some embodiments, the second coupling-in structure 802 may not be provided, so that the coupling-out structure 803 only emits the image generated by the light-emitting element, thereby achieving a virtual reality (VR) display effect, which is not limited here.

[0100] In some embodiments, Fig.16 As shown, the near-eye display device also includes a reflective element 900. The reflective element 900 is located on the light-emitting side of the light-emitting surface 302 of the light-combining component. The reflective element 900 is used to reflect the light emitted by the light-combining component into the user's eyes, so that a virtual image generated by the light-emitting element is presented in the user's eyes. In a specific implementation, the reflective element 900 may be a transflective mirror, which may reflect the light emitted by the light-combining component into the user's eyes, and may transmit ambient light into the user's eyes, so as to achieve the fusion of the virtual image generated by the light-emitting element and the image of the real environment, and realize the display effect of augmented reality (AR). In some embodiments, the reflective element 900 may also be a reflector, which is used to reflect the light emitted by the light-combining component into the user's eyes without transmitting ambient light, so that only the virtual image generated by the light-emitting element is presented in the user's eyes, and the display effect of virtual reality (VR) is realized.

[0101] In specific implementation, the near-eye display device provided by the embodiment of the present invention can also realize AR display or VR display in other ways, which is not limited here. The near-eye display device provided by the embodiment of the present invention can also be other near-eye display devices other than AR display devices or VR display devices, which can use the structure provided by the embodiment of the present invention to realize the corresponding functions and achieve the same technical effects as the embodiment of the present invention, which will not be repeated here.

[0102] The near-eye display device provided in the embodiment of the present invention also includes connecting wires, interfaces and controllers connected to the light-emitting elements for connecting the light-emitting elements. When implementing it specifically, reference may be made to the relevant contents in the prior art and will not be elaborated here.

[0103] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0104] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A near-eye display device, It is characterized in that include: at least two light emitting elements; At least one of the light-emitting elements is a monochromatic light-emitting element, which is used to emit monochromatic light; A light combining component, located on the outgoing light path of each of the light emitting elements; The light combining component is used to combine incident light; At least one color conversion layer, one color conversion layer corresponds to one monochromatic light-emitting element; the color conversion layer is located between the corresponding monochromatic light-emitting element and the light incident surface of the light combining component, and is used to receive the output light of the monochromatic light-emitting element and perform color conversion.

2. The near-eye display device according to claim 1, It is characterized in that The number of the light-emitting elements is two, including a multi-color light-emitting element and a monochromatic light-emitting element; The multicolor light-emitting element is used to emit at least blue light and green light; the monochromatic light-emitting element is used to emit non-red light; the color conversion layer is located between the monochromatic light-emitting element and the light incident surface of the light combining component, and is used to convert the light emitted by the monochromatic light-emitting element into red light.

3. The near-eye display device according to claim 1, It is characterized in that The number of the light-emitting elements is three; each of the light-emitting elements is a single-color light-emitting element, and the color of the light emitted by each of the light-emitting elements is the same; The number of the color conversion layers is at least two; each color conversion layer is located between the corresponding monochromatic light-emitting element and the light incident surface of the light combining component, and is used to receive the light emitted by the corresponding monochromatic light-emitting element and perform color conversion so that the output light of the light combining component includes red light, green light and blue light.

4. The near-eye display device according to claim 3, It is characterized in that The light emitted by the light-emitting element is blue light; the number of the color conversion layers is two, and each color conversion layer is located between any two of the light-emitting elements and the light incident surface of the light-combining component; wherein one color conversion layer is used to convert the blue light into green light, and the other color conversion layer is used to convert the blue light into red light; Alternatively, the light emitted by the light-emitting element is ultraviolet light; the number of the color conversion layers is three, and each of the color conversion layers is respectively located between each of the light-emitting elements and the light incident surface of the light-combining component; wherein, one of the color conversion layers is used to convert the ultraviolet light into green light, one of the color conversion layers is used to convert the ultraviolet light into red light, and one of the color conversion layers is used to convert the ultraviolet light into blue light.

5. The near-eye display device according to claim 1, It is characterized in that The number of the light-emitting elements is three, and the number of the color conversion layer is one; each of the light-emitting elements is a monochromatic light-emitting element, namely, a first monochromatic light-emitting element, a second monochromatic light-emitting element, and a third monochromatic light-emitting element; The first monochromatic light-emitting element is used to emit blue light, the second monochromatic light-emitting element is used to emit green light, and the third monochromatic light-emitting element is used to emit monochromatic light other than red light; the color conversion layer is located between the third monochromatic light-emitting element and the light-combining component, and is used to convert the light emitted by the third monochromatic light-emitting element into red light.

6. The near-eye display device according to claim 4 or 5, It is characterized in that The light combining component is a light combining prism; the light combining prism is used to receive the light emitted by the light emitting element and / or the color conversion layer, and fuse it into three primary color light for emission, thereby generating a full-color image; The light-combining prism comprises a first prism, a second prism, a third prism and a fourth prism; the oblique surfaces of the first prism, the second prism, the third prism and the fourth prism are matched in pairs; wherein the first prism is located on the opposite side of the third prism, and the second prism is located on the opposite side of the fourth prism; The bottom surface of the first prism is the light emitting surface of the light combining component, the bottom surface of the second prism, the bottom surface of the third prism and the bottom surface of the fourth prism are the three light incident surfaces of the light combining component, and each of the light emitting elements is arranged in one-to-one correspondence with each of the light incident surfaces; A first transflective film is disposed between the first prism and the second prism, and the first transflective film is used to reflect the red light and transmit the green light and the blue light; A second transflective film is disposed between the second prism and the third prism, and the second transflective film is used to reflect the blue light and transmit the green light; A third transflective film is disposed between the third prism and the fourth prism, and the third transflective film is used to reflect the red light and transmit the green light; A fourth transflective film is disposed between the fourth prism and the first prism, and the fourth transflective film is used for reflecting the blue light and transmitting the red light and the green light.

7. The near-eye display device according to any one of claims 1 to 5, It is characterized in that The color conversion layer is attached to the light incident surface of the light combining component.

8. The near-eye display device according to any one of claims 1 to 5, It is characterized in that Also includes: The anti-reflection and anti-reflection film is located on the surface of the light incident surface of the light combining component.

9. The near-eye display device according to any one of claims 1 to 5, It is characterized in that Also includes: The filter layer is located between the color conversion layer and the light incident surface of the light combining component.

10. The near-eye display device according to any one of claims 1 to 5, It is characterized in that The monochromatic light-emitting element includes light-emitting units arranged in an array; the color conversion layer includes color conversion units arranged in an array, one color conversion unit corresponds to one light-emitting unit, and the color conversion unit is used to receive light from the corresponding light-emitting unit and perform color conversion; The color conversion layer further includes a black matrix located at intervals between the color conversion units.

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