Transparent backlight panel and process, transparent LCD screen, electronic device, VR / AR device

Abstract

The application provides a transparent backlight panel and process, a transparent LCD screen, an electronic device and a VR / AR device. In the transparent backlight panel, each recess structure is a microstructure, and the illumination light is coupled into the optical waveguide to propagate by total reflection. The coated recess structure can reflect the illumination light with a preset characteristic, thereby breaking the total reflection propagation of the illumination light, so that the illumination light can be coupled out of the optical waveguide to achieve illumination. The transparent backlight display panel is used as a backlight plate of the LCD screen to provide illumination for the LCD screen, and replaces the original opaque backlight module of the LCD screen, so that the entire LCD screen becomes a transparent screen. Since the optical waveguide is transparent, and the coated recess structure only reflects the illumination light with a preset characteristic, the display image of the LCD screen is basically not affected, and the environmental objects behind the LCD screen can also be seen, so that a transparent LCD screen can be manufactured.

Description

Technical Field

[0001] This application relates to the field of transparent display technology, specifically to transparent backlight panels and processes, transparent LCD screens, electronic devices, and VR / AR devices. Background Technology

[0002] In recent years, transparent LCD screens have gradually gained popularity in the display technology field. Transparent LCD screens can be applied to many uses, such as augmented reality displays, where users can see the real-world scene behind the screen while simultaneously viewing the content displayed on it, thus achieving augmented reality overlay. How to make display screens transparent is a technical problem that needs to be solved in the field of technology. Summary of the Invention

[0003] In view of this, this application provides a transparent backlight panel and process, a transparent LCD screen, an electronic device, and a VR / AR device, which can be used in the manufacture of transparent LCD screens to achieve transparency of LCD screens.

[0004] In a first aspect, this application provides a transparent backlight panel, comprising: an optical waveguide, wherein a first surface of the optical waveguide has a plurality of recessed structures, the plurality of recessed structures forming a structural array; a light selective film disposed on the recessed structures, the light selective film being configured to reflect illumination light of a preset characteristic in the optical waveguide; and a transparent filling structure covering the structural array; the surface of the filling structure facing away from the structural array is parallel to a second surface of the optical waveguide; wherein the second surface is located on the opposite side of the first surface.

[0005] In this embodiment, each recessed structure is a microstructure. Illumination light is coupled into the optical waveguide and propagates through total internal reflection. The coated recessed structure can reflect illumination light with preset characteristics, thereby breaking the total internal reflection propagation of the illumination light and allowing the illumination light to be coupled out of the optical waveguide to achieve illumination. The size of the recessed structure can be designed to be small, so that ambient light or image light passing through the transparent backlight panel is not affected. When illumination light shines on the array of recessed structures, if a portion of the illumination light meets the preset characteristics, it is reflected by the light-selective film. If the reflected illumination light no longer meets the total internal reflection propagation condition, it is coupled out of the optical waveguide from the second surface. When a portion of the illumination light in the optical waveguide shines on the light-selective film, if it does not meet the preset characteristics, it is refracted. The refracted illumination light is incident on the filling structure. If the illumination light incident on the filling structure meets the total internal reflection condition of the filling structure, it propagates through total internal reflection. If it does not meet the total internal reflection condition, it exits from the planar surface of the filling structure away from the planar surface of the structural array. When illumination light propagating through total internal reflection in the filled structure illuminates the light selective film, a portion of the illumination light that meets the preset characteristics is reflected. If the reflected illumination light no longer meets the total internal reflection condition of the filled structure, it is coupled out from the planar surface. When illumination light in the filled structure illuminates the light selective film, a portion of the illumination light that does not meet the preset characteristics is refracted, and the refracted illumination light enters the optical waveguide. Simulation calculations show that the luminous flux of the illumination light emitted from the second surface of the optical waveguide and the illumination light emitted from the planar surface of the filled structure is essentially the same. Therefore, both surfaces of this transparent backlight panel can be used for illumination.

[0006] In this application, the transparent backlit display panel is used as the backlight of an LCD screen to provide illumination, replacing the original opaque backlight module and making the entire LCD screen transparent. Since the waveguide is transparent and the recessed structure of the coating only reflects illumination light with preset characteristics, it has virtually no impact on the displayed image of the LCD screen, and environmental objects behind the LCD screen can be seen, thus enabling the creation of a transparent LCD screen.

[0007] In conjunction with the first aspect, in one possible implementation, a portion of the side surface of the optical waveguide is a coupling surface, which is configured to couple the illumination light into the optical waveguide for total internal reflection propagation.

[0008] In conjunction with the first aspect, in one possible implementation, the coupling surface is an arc surface recessed into the optical waveguide.

[0009] In conjunction with the first aspect, in one possible implementation, the two interfaces between the coupling surface and the second and first surfaces of the optical waveguide are both curved surfaces.

[0010] In conjunction with the first aspect, in one possible implementation, a portion of the side surface of the optical waveguide is a reflective surface, which is configured to reflect the illumination light.

[0011] In conjunction with the first aspect, in one possible implementation, the reflecting surface is an arc surface recessed into the optical waveguide.

[0012] In conjunction with the first aspect, in one possible implementation, the two interfaces between the reflecting surface and the second and first surfaces of the optical waveguide are both curved surfaces.

[0013] In conjunction with the first aspect, in one possible implementation, the difference between the first refractive index of the filling structure and the second refractive index of the optical waveguide is any value from 0 to 0.3.

[0014] In conjunction with the first aspect, in one possible implementation, the shape of the recessed structure is a polygonal pyramid or prism recessed into the optical waveguide, the base angle of the recessed structure is any value between 15° and 45°, and the shapes of multiple recessed structures are similar.

[0015] In conjunction with the first aspect, in one possible implementation, different recessed structures are arranged adjacent to each other, and the length of the longest side of the bottom surface of the recessed structure is any value between 20um and 70um.

[0016] In conjunction with the first aspect, in one possible implementation, the spacing between different recessed structures is equal, and the sum of the length of the longest side of the bottom surface of the recessed structure and the spacing is any value between 20µm and 70µm.

[0017] In conjunction with the first aspect, in one possible implementation, the sum of the length of the longest side of the bottom surface of the recessed structure and the distance between different recessed structures is any value between 20µm and 70µm.

[0018] In conjunction with the first aspect, in one possible implementation, the shape of the recessed structure is a polygonal pyramid or prism recessed into the optical waveguide, and the base angle of the recessed structure is any value between 15° and 45°; wherein, different recessed structures are arranged adjacent to each other, and the length of the longest side of the base surface of the recessed structure is any value between 20µm and 70µm.

[0019] In conjunction with the first aspect, in one possible implementation, the shape of the recessed structure is an arc surface recessed into the optical waveguide, and the radii of curvature of the plurality of recessed structures are the same.

[0020] In conjunction with the first aspect, in one possible implementation, different recessed structures are arranged adjacent to each other, and the radius of curvature of the recessed structures is any value from 20um to 70um.

[0021] In conjunction with the first aspect, in one possible implementation, the spacing between different recessed structures is equal, and the sum of the radius of curvature of the recessed structure and the spacing is any value between 20 μm and 70 μm.

[0022] In conjunction with the first aspect, in one possible implementation, the sum of the radius of curvature of the recessed structure and the distance between different recessed structures is any value between 20 μm and 70 μm.

[0023] In conjunction with the first aspect, in one possible implementation, the shape of the recessed structure is an arc surface recessed into the optical waveguide; wherein different recessed structures are arranged adjacent to each other, and the radius of curvature of the recessed structure is any value from 20um to 70um.

[0024] In conjunction with the first aspect, in one possible implementation, the reflectivity of the light selective film for the illumination light with an incident angle of 0° to 70° is any value between 1% and 6%, and the reflectivity of the light selective film for the illumination light with an incident angle of 70° to 90° is less than or equal to 10%.

[0025] In conjunction with the first aspect, in one possible implementation, the light selective film has a reflectance of 1% to 6% for the illumination light with an incident angle of 0° to 70°, and the light selective film has a reflectance of 10% to 45% for the illumination light with an incident angle of 70° to 90°.

[0026] In conjunction with the first aspect, in one possible implementation, the wavelength bandwidth of the light-selective film is 400 nm to 700 nm.

[0027] In conjunction with the first aspect, one possible implementation further includes: a light source configured to emit the illumination light; and a first polarizer disposed between a side of the optical waveguide and the light source.

[0028] Secondly, this application provides a multi-layer backlight panel, including the aforementioned transparent backlight panel, wherein a plurality of the transparent backlight panels are stacked on top of each other.

[0029] The second aspect includes the entire structure of the first aspect, and the technical effects of the second aspect will not be elaborated here.

[0030] Thirdly, this application provides a transparent LCD screen, including: a display module; and one or more of the aforementioned transparent backlight panels, the transparent backlight panels being used to provide backlight for the display module.

[0031] The third aspect includes the entire structure of the first aspect, and the technical effects of the third aspect will not be elaborated here.

[0032] In conjunction with the third aspect, in one possible implementation, the display module includes: a first glass substrate; a second glass substrate disposed parallel to the first glass substrate; a first alignment film attached to the surface of the first glass substrate facing the second glass substrate; a color filter attached to the surface of the second glass substrate facing the first glass substrate; a second alignment film attached to the surface of the color filter facing the first glass substrate; a liquid crystal layer disposed between the first alignment film and the second alignment film; and a second polarizer attached to the surface of the second glass substrate facing away from the first glass substrate; wherein one or more of the transparent backlight panels are attached to the surface of the second polarizer facing away from the second glass substrate.

[0033] Fourthly, this application provides an electronic device, including: a display screen, the display screen including the aforementioned transparent LCD screen.

[0034] The fourth aspect includes the entire structure of the first aspect, and the technical effects of the fourth aspect will not be elaborated here.

[0035] Fifthly, this application provides a VR device, including: an image source, the image source including the aforementioned transparent backlight panel, the transparent backlight panel providing backlight for the image source.

[0036] The fifth aspect includes the entire structure of the first aspect, and the technical effects of the fifth aspect will not be elaborated here.

[0037] Sixthly, this application provides an AR device, including: an image source, the image source including the aforementioned transparent backlight panel, the transparent backlight panel providing backlight for the image source.

[0038] The sixth aspect includes the entire structure of the first aspect, and the technical effects of the sixth aspect will not be elaborated here.

[0039] In a seventh aspect, this application provides a transparent backlight panel manufacturing process, comprising: molding a structural array composed of a plurality of recessed structures on a first surface of an optical waveguide; depositing a film layer on the plurality of recessed structures, the film layer being used to reflect illumination light of a predetermined characteristic in the optical waveguide; and covering the structural array with a filling structure, such that the surface of the filling structure facing away from the structural array is parallel to a second surface of the optical waveguide; wherein the second surface is located on the opposite side of the first surface.

[0040] The seventh aspect is the production method of the first aspect, and the technical effects of the seventh aspect will not be elaborated here. Attached Figure Description

[0041] Figure 1 The diagram shown is a structural schematic of a transparent backlight panel provided in an embodiment of this application.

[0042] Figure 2 The diagram shown is a schematic diagram of a recessed structure, which is a polygonal pyramid or a polygonal prism, provided in one embodiment of this application.

[0043] Figure 3 The diagram shown is a schematic diagram of a recessed structure, which is a polygonal pyramid or a polygonal prism, provided in one embodiment of this application.

[0044] Figure 4 The diagram shown is a schematic diagram of a recessed structure, which is a polygonal pyramid or a polygonal prism, provided in one embodiment of this application.

[0045] Figure 5 The diagram shown is a schematic diagram of a concave arc surface provided in an embodiment of this application.

[0046] Figure 6 The diagram shown is a schematic diagram of a concave arc surface provided in an embodiment of this application.

[0047] Figure 7 The diagram shown is a schematic diagram of a concave arc surface provided in an embodiment of this application.

[0048] Figure 8 The diagram shown is a schematic diagram of a concave arc surface provided in an embodiment of this application.

[0049] Figure 9 The diagram shown is a general optical path schematic provided in an embodiment of this application.

[0050] Figure 10 The diagram shown is a structural schematic of a coupling surface and a reflecting surface provided in an embodiment of this application.

[0051] Figure 11 The diagram shown is a schematic diagram of another structure of the coupling surface and the reflecting surface provided in one embodiment of this application.

[0052] Figure 12 The diagram shown is a schematic diagram of a concave prism structure provided in an embodiment of this application.

[0053] Figure 13 The diagram shown is a schematic diagram of a concave pyramidal structure provided in an embodiment of this application.

[0054] Figure 14 The diagram shown is a structural schematic of a multilayer backlight panel provided in an embodiment of this application.

[0055] Figure 15 The diagram shown is a structural schematic of a transparent LCD screen provided in an embodiment of this application.

[0056] Figure 16 The diagram shown is a manufacturing process flow chart of a transparent backlight panel according to an embodiment of this application. Detailed Implementation

[0057] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0058] Exemplary transparent backlight panel

[0059] This application provides a transparent backlight panel, in one embodiment, such as Figure 1 As shown, the transparent backlight panel includes: an optical waveguide 100, a light selection film, and a transparent filling structure 200.

[0060] The first surface of the optical waveguide 100 has multiple recessed structures 102, which form a structure array. A light-selective film is disposed on the recessed structures 102, and the light-selective film is configured to reflect illumination light with preset characteristics in the optical waveguide 100. A filling structure 200 covers the structure array. The surface of the filling structure 200 facing away from the structure array is parallel to the second surface 101 of the optical waveguide 100. The second surface 101 is located opposite the first surface.

[0061] In this embodiment, each recessed structure 102 is a microstructure. Illumination light is coupled into the optical waveguide 100 and propagates through total internal reflection. The coated recessed structure 102 can reflect illumination light with preset characteristics, thereby breaking the total internal reflection propagation of the illumination light and allowing the illumination light to be coupled out of the optical waveguide 100 to achieve illumination. The size of the recessed structure 102 can be designed to be small, so that ambient light or image light is not affected when passing through the transparent backlight panel.

[0062] Specifically, when illumination light propagating through total internal reflection in the optical waveguide 100 illuminates the structural array composed of recessed structures 102, if a portion of the illumination light meets preset characteristics, it is reflected by the light-selective film. If the reflected illumination light no longer meets the total internal reflection propagation condition, it is coupled out of the optical waveguide 100 from the second surface 101. If a portion of the illumination light in the optical waveguide 100 illuminates the light-selective film and does not meet the preset characteristics, it is refracted. The refracted illumination light is incident on the filling structure 200. If the illumination light incident on the filling structure 200 meets the total internal reflection condition of the filling structure 200, it undergoes total internal reflection propagation. If it does not meet the total internal reflection condition, it exits from the filling structure 200 away from the planar surface 201 of the structural array.

[0063] When illumination light propagating through total internal reflection in the filling structure 200 illuminates the light selective film, a portion of the illumination light that meets preset characteristics is reflected. If the reflected illumination light no longer meets the total internal reflection condition of the filling structure 200, it is coupled out from the planar surface 201. When illumination light in the filling structure 200 illuminates the light selective film, a portion of the illumination light that does not meet preset characteristics is refracted, and the refracted illumination light is incident into the optical waveguide 100. Simulation calculations show that the luminous flux of the illumination light emitted from the second surface 101 of the optical waveguide 100 and the illumination light emitted from the planar surface 201 of the filling structure 200 is essentially the same. Therefore, both surfaces of the transparent backlight panel can be used for illumination.

[0064] The preset illumination light can be light with a preset incident angle, light with a preset wavelength, light with a preset polarization, light with a preset incident angle, or light with preset polarization and a preset wavelength. Other light characteristics will not be elaborated here. Ambient light can basically pass through the optical waveguide 100, the structure array, and the filling structure 200, making the transparent backlight display panel basically transparent overall. Furthermore, the planar surface 201 of the filling structure 200 facing away from the structure array is parallel to the second surface 101 of the optical waveguide 100, so that when ambient light passes through the optical waveguide 100 and the filling structure 200 in sequence, the optical path of the ambient light remains basically unchanged. That is, when viewing the ambient objects behind the transparent backlight display panel, no distortion occurs, thus it can be used as a transparent backlight.

[0065] In this embodiment, the transparent backlight display panel is used as the backlight of the LCD screen to provide illumination for the LCD screen, replacing the original opaque backlight module of the LCD screen, thus making the entire LCD screen transparent. Since the light waveguide is transparent and the recessed structure of the coating only reflects illumination light with preset characteristics, it basically does not affect the displayed image of the LCD screen, and the environmental objects behind the LCD screen can also be seen, thereby enabling the manufacture of a transparent LCD screen.

[0066] In one embodiment, such as Figure 1As shown, a portion of the side surface of the optical waveguide 100 is a coupling surface 103. The coupling surface 103 is configured to couple the illumination light into the optical waveguide 100 for total internal reflection propagation. The shape of the coupling surface 103 is not limited; it can be either a plane or a curved surface.

[0067] In one embodiment, such as Figure 1 As shown, the coupling surface 103 is an arc surface that is recessed into the optical waveguide 100. The coupling surface 103 is a concave lens, which can couple in more illumination light, that is, improve the ability to collect illumination light.

[0068] In one embodiment, such as Figure 1 As shown, the two interfaces between the coupling surface 103 and the second surface 101 and the first surface of the optical waveguide 100 are both arc surfaces. The arc-shaped interface can increase the effective area of ​​the inner surface of the optical waveguide 100, thereby increasing the number of total internal reflection propagation times of the illumination light propagating in the optical waveguide 100. This makes it less likely for the illumination light to couple out from the interface, thus increasing the amount of illumination light coupled out from the second surface 101 or the planar surface 201.

[0069] In one embodiment, such as Figure 1 As shown, a portion of the side surface of the optical waveguide 100 is a reflective surface 106, which is configured to reflect illumination light. In this embodiment, illumination light incident on the side surface of the optical waveguide 100 can be reflected back into the optical waveguide 100 for further total internal reflection propagation, thereby improving light energy utilization. Specifically, all side surfaces of the optical waveguide 100, except for the coupling surface 103, can be configured as reflective surfaces 106.

[0070] In one embodiment, such as Figure 1 As shown, the reflective surface 106 is an arc surface that is recessed into the optical waveguide 100, making the reflective surface 106 a concave lens, thereby reflecting more illumination light and improving the utilization rate of illumination light.

[0071] In one embodiment, such as Figure 1 As shown, the two interfaces between the reflective surface 106 and the second surface 101 and the first surface of the optical waveguide 100 are both arc surfaces. The arc-shaped interface can increase the effective area of ​​the inner surface of the optical waveguide 100, thereby increasing the number of total internal reflection propagation times of the illumination light propagating in the optical waveguide 100. This makes it less likely for the illumination light to couple out from the interface, thus increasing the amount of illumination light coupled out from the second surface 101 or the planar surface 201.

[0072] In one embodiment, the difference between the first refractive index of the filling structure 200 and the second refractive index of the optical waveguide is any value between 0 and 0.3, which ensures that the filling structure 200 has high light transmittance. Furthermore, a smaller refractive index difference ensures that the illumination light does not have a large refraction angle during the transfer medium, and a smaller refraction angle allows the illumination light to still propagate through total internal reflection after the transfer medium. Specifically, the optical waveguide 100 can be made of PMMA material, and the filling structure 200 can be made of UV adhesive.

[0073] In one embodiment, such as Figure 1 As shown, the shape of the recessed structure 102 is a polygonal pyramid or prism recessed into the optical waveguide. The base angle of the recessed structure is any value between 15° and 45°, and the shapes of multiple recessed structures are similar.

[0074] In this embodiment, the array of recessed structures 102 of this shape has better reflection efficiency for illumination light and less impact on transmitted ambient light and LCD image light. The similar shapes of the multiple recessed structures 102, i.e., the base angles of multiple pyramids or prisms are identical, make the transmitted ambient light and LCD image light more uniform, avoiding uneven brightness when viewing the transparent backlight panel. The base angles of the pyramids or prisms are 15° to 45°, which is the typical total internal reflection angle range of the optical waveguide 100. This angle range allows the illumination light propagating through total internal reflection to strike the edges of the pyramids or prisms for reflection or refraction.

[0075] In one embodiment, such as Figure 1 As shown, different recessed structures 102 are arranged adjacent to each other, and the length of the longest side of the bottom surface of the recessed structure 102 is any value between 20µm and 70µm. In this embodiment, the adjacent recessed structures 102 form a densely arranged structural array, and a larger number of recessed structures 102 can improve the reflection efficiency of illumination light. Furthermore, the size of a single recessed structure 102 is greater than 20µm to avoid diffraction, and a single recessed structure 102 with a size less than 70µm is smaller than the size of a single pixel of the LCD. When this transparent backlight panel is applied to an LCD screen, the recessed structures 102 smaller than the size of a single pixel will not affect the display content of the LCD.

[0076] In one embodiment, such as Figure 2As shown, the spacing between different recessed structures 102 is equal, and the sum of the longest side of the bottom surface of the recessed structure 102 and the spacing is any value between 20µm and 70µm. In this embodiment, the recessed structures 102 are evenly distributed, which makes the transmitted ambient light and LCD image light more uniform, avoiding uneven brightness when viewing the transparent backlight panel. Furthermore, the absence of a densely arranged array of structures reduces process requirements. The total size of the recessed structure 102 and its spacing is within the range of 20µm to 70µm, which avoids diffraction and does not exceed the size of a single pixel, thus not affecting the displayed content.

[0077] In one embodiment, such as Figure 3 As shown, the sum of the length of the longest side of the bottom surface of the recessed structure 102 and the distance between different recessed structures 102 is any value between 20µm and 70µm. In this embodiment, the recessed structures 102 can be non-equidistantly distributed, thereby reducing the requirements of the manufacturing process and reducing manufacturing costs. The total size of the recessed structures 102 and their distances is within the range of 20µm to 70µm, which avoids diffraction phenomena and prevents them from exceeding the size of a single pixel and affecting the displayed content.

[0078] In one embodiment, such as Figure 4 As shown, the recessed structure 102 is shaped like a polygonal pyramid or prism recessed into the optical waveguide 100, and the base angle of the recessed structure 102 is any value between 15° and 45°. Different recessed structures 102 are arranged adjacent to each other, and the length of the longest side of the base surface of the recessed structure 102 is any value between 20µm and 70µm.

[0079] In this embodiment, the array of recessed structures 102 of this shape exhibits superior reflection efficiency for illumination light and minimal impact on transmitted ambient light and LCD image light. Adjacent recessed structures 102 form a densely arranged array, and a larger number of recessed structures 102 can improve the reflection efficiency of illumination light. The shapes and sizes of the individual recessed structures 102 can vary, meaning the base angles of multiple pyramids or prisms can differ, thereby reducing manufacturing process requirements and costs. The base angles of the pyramids or prisms range from 15° to 45°, which is the typical total internal reflection angle range of the optical waveguide 100. This angle range allows illumination light propagating through total internal reflection to strike the edges of the pyramids or prisms for reflection or refraction. The size of a single recessed structure 102 is greater than 20um to avoid diffraction. A single recessed structure 102 with a size of less than 70um is smaller than the size of a single pixel of the LCD. When this transparent backlight panel is applied to an LCD screen, the recessed structure 102, which is smaller than the size of a single pixel, will not affect the display content of the LCD.

[0080] In one embodiment, such as Figure 5 As shown, the shape of the recessed structure 102 is an arc surface recessed into the optical waveguide 100, and the radii of curvature of multiple recessed structures 102 are the same.

[0081] In this embodiment, the array of recessed structures 102 of this shape has better reflectivity for illumination light and less impact on transmitted ambient light and LCD image light. Moreover, the similar shapes of the recessed structures 102 can make the transmitted ambient light and LCD image light more uniform, avoiding uneven brightness when viewing the transparent backlight panel.

[0082] In one embodiment, such as Figure 5 As shown, different recessed structures 102 are arranged adjacent to each other, and the radius of curvature of the recessed structure 102 is any value between 20µm and 70µm. In this embodiment, the adjacent recessed structures 102 form a densely arranged structural array, and the large number of recessed structures 102 can improve the reflection efficiency of illumination light. Furthermore, the radius of curvature of a single recessed structure 102 is greater than 20µm to avoid diffraction, and the radius of curvature of a single recessed structure 102 is less than 70µm, which is smaller than the size of a single pixel of the LCD. When this transparent backlight panel is applied to the LCD screen, the recessed structures 102 smaller than the size of a single pixel will not affect the display content of the LCD.

[0083] In one embodiment, such as Figure 6 As shown, the spacing between different recessed structures 102 is equal, and the sum of the radius of curvature of the recessed structure 102 and the spacing is any value between 20µm and 70µm. In this embodiment, the recessed structures 102 are evenly distributed, which makes the transmitted ambient light and LCD image light more uniform, avoiding uneven brightness when viewing the transparent backlight panel. Furthermore, the absence of a densely arranged array of structures reduces process requirements. The total size of the recessed structure 102 and its spacing is within the range of 20µm to 70µm, which avoids diffraction and does not exceed the size of a single pixel, thus not affecting the displayed content.

[0084] In one embodiment, such as Figure 7 As shown, the radius of curvature of the recessed structure 102, plus the sum of the distances between different recessed structures, is any value between 20µm and 70µm. In this embodiment, the recessed structures 102 can be non-equidistantly distributed, thereby reducing the requirements of the manufacturing process and lowering manufacturing costs. The total size of the recessed structures 102 and their spacing is within the range of 20µm to 70µm, which avoids diffraction phenomena and prevents them from exceeding the size of a single pixel and affecting the displayed content.

[0085] In one embodiment, such as Figure 8 As shown, the recessed structure 102 is an arc-shaped surface recessed into the optical waveguide 100. Different recessed structures 102 are arranged adjacent to each other, and the radius of curvature of the recessed structure 102 is any value between 20 μm and 70 μm.

[0086] In this embodiment, the array of recessed structures 102 exhibits superior reflectivity for illumination light and minimal impact on transmitted ambient light and LCD image light. Adjacent recessed structures 102 form a densely arranged array, and a larger number of recessed structures 102 can improve the reflectivity for illumination light. The radii of curvature of each recessed structure 102 can be different, thereby reducing manufacturing process requirements and costs. A size greater than 20µm for a single recessed structure 102 avoids diffraction; a size less than 70µm, smaller than a single pixel size in an LCD, ensures that when this transparent backlight panel is applied to an LCD screen, the smaller recessed structures 102 will not affect the displayed content.

[0087] In some embodiments, the recessed structure is a polygonal pyramid or prism, and all the pyramids or prisms have similar shapes; all the pyramids or prisms have similar shapes and are closely adjacent; all the pyramids or prisms have similar shapes and are spaced equally; the recessed structure is a concave arc surface, and all the concave arc surfaces have similar shapes; all the concave arc surfaces have similar shapes and are closely adjacent; and all the concave arc surfaces have similar shapes and are spaced equally. These six embodiments have high manufacturing precision, thus requiring high precision in the coating process. The aforementioned preset characteristics include: the reflectivity of the light-selective film for illumination light with an incident angle of 0° to 70° is any value between 1% and 6%, and the reflectivity of the light-selective film for illumination light with an incident angle of 70° to 90° is less than or equal to 10%. This embodiment only has a low reflectivity for illumination light, therefore most ambient light and LCD image light can pass through the light-selective film, ensuring that ambient light and LCD image light can achieve high transmittance.

[0088] In some embodiments, the manufacturing process precision is not high in the following four cases: when all pyramidal or prism shapes are similar but the spacing can be different; when all pyramidal or prism shapes are different but closely adjacent; when all concave arc surfaces are similar but the spacing can be different; and when all concave arc surfaces are different but closely adjacent. Therefore, the requirements for the coating process are not high. The aforementioned preset characteristics include: the reflectance of the light-selective film for illumination light with an incident angle of 0° to 70° is any value between 1% and 6%, and the reflectance of the light-selective film for illumination light with an incident angle of 70° to 90° is any value between 10% and 45%, thereby ensuring that ambient light and LCD image light can achieve high transmittance.

[0089] In one embodiment, the wavelength bandwidth of the light-selective film is 400nm to 700nm, meaning that the light-selective film only affects illumination light in the visible band to achieve the illumination function. For example, when it is necessary to introduce infrared functionality into a transparent LCD screen, the light-selective film will not affect the infrared functionality.

[0090] In one embodiment, such as Figures 1 to 8 As shown, the transparent backlight panel also includes a light source 300 and a first polarizer 400. The light source 300 is configured to emit illumination light, and the first polarizer 400 is disposed between the side of the optical waveguide 100 and the light source 300.

[0091] In this embodiment, the first polarizer 400 polarizes the illumination light emitted from the light source 300, making the illumination light coupled into the optical waveguide 100 polarized illumination light of the first polarization state. Since the reflection requirements of the light-selective film system deposited on the recessed structure 102 are better achieved under polarized light, polarized illumination light can reduce the coating requirements of the light-selective film. Furthermore, since the backlight required by the LCD screen is polarized light, the first polarizer 400 enables the transparent backlight panel to provide polarized illumination light to the LCD screen.

[0092] In one embodiment, the aforementioned preset characteristics include: the reflectance of the light selective film in this application for illumination light of the first polarization state with an incident angle of 0° to 70° is any value of 1% to 6%, and the reflectance of the light selective film for illumination light of the first polarization state with an incident angle of 70° to 90° is any value of less than or equal to 10%, thereby making the light selective film essentially have no effect on ambient light and further improving the transmittance of ambient light.

[0093] In one embodiment, the aforementioned preset characteristics include: the reflectance of the light selective film in this application for illumination light of the first polarization state with an incident angle of 0° to 70° is any value of 1% to 6%, and the reflectance of the light selective film for illumination light of the first polarization state with an incident angle of 70° to 90° is any value of 10% to 45%, thereby enabling the light selective film to have virtually no effect on ambient light and further improving the transmittance of ambient light.

[0094] In one embodiment, the optical path diagram is as follows: Figure 9 As shown, the approximate optical path of the illumination light emitted from the light source 300 is represented by a dashed line with an arrow. The illumination light enters the optical waveguide 100 and propagates through total internal reflection. A portion of the illumination light in the optical waveguide 100 is reflected by the structural array, breaking the total internal reflection propagation, and then couples out of the optical waveguide 100 from the lower second surface 101. Another portion of the illumination light in the optical waveguide 100 is refracted through the structural array and enters the filling structure 200 for total internal reflection propagation, or is directly coupled out from the planar surface 201. When the illumination light in the filling structure 200 illuminates the structural array, a portion of the illumination light is reflected, breaking the total internal reflection propagation, and then couples out from the planar surface 201; another portion of the illumination light is refracted through the structural array and enters the optical waveguide 100. Simulations show that the luminous flux of the illumination light coupled from the lower second surface 101 of the transparent backlight panel is essentially the same as the luminous flux of the illumination light coupled from the upper planar surface 201.

[0095] In one embodiment, such as Figure 10 and Figure 11 As shown, the coupling surface 103 can be two planes with an included angle, or it can be a single plane; the reflecting surface 106 can also be two planes with an included angle, or it can be a single plane. When both the coupling surface 103 and the reflecting surface 106 are two planes, the manufacturing process can be simplified, thereby reducing device costs, and to some extent, reducing the loss of illumination light propagating through total internal reflection within the optical waveguide. When both the coupling surface 103 and the reflecting surface 106 are a single plane, the manufacturing process can be simplified, thereby reducing device costs.

[0096] Figure 12 An embodiment showing that the recessed structure 102 is a polygonal prism. Figure 13 This embodiment shows that the recessed structure 102 is a square pyramid. Alternatively, the recessed structure 102 can also be a triangular pyramid.

[0097] Exemplary multilayer backlight panel

[0098] This application provides a multi-layer backlight panel, in one embodiment, such as... Figure 14 As shown, the multi-layer backlight panel includes a plurality of the aforementioned transparent backlight panels 140, which are stacked on top of each other. This embodiment can increase backlight intensity by using multiple transparent backlight panels 140, thereby providing a brighter backlight.

[0099] Exemplary transparent LCD screen

[0100] This application provides a transparent LCD screen. In one embodiment, the transparent LCD screen includes a display module and one or more of the aforementioned transparent backlight panels, wherein the transparent backlight panels are used to provide backlight for the display module. The transparent LCD screen in this embodiment can be various screen product forms such as small display screens for daily use, large outdoor display screens, and large advertising screens.

[0101] In one embodiment, such as Figure 15 As shown, the transparent LCD screen includes: a first glass substrate 507, a second glass substrate 502, a first alignment film 506, a color filter 503, a second alignment film 504, a liquid crystal layer 505, a second polarizer 501, and one or more of the aforementioned transparent backlight panels 140. The second glass substrate 502 and the first glass substrate 507 are arranged parallel to each other. The first alignment film 506 is attached to the surface of the first glass substrate 507 facing the second glass substrate 502. The color filter 503 is attached to the surface of the second glass substrate 502 facing the first glass substrate 507. The second alignment film 504 is attached to the surface of the color filter 503 facing the first glass substrate 507. The liquid crystal layer 505 is disposed between the first alignment film 506 and the second alignment film 504. The second polarizer 501 is attached to the surface of the second glass substrate 502 facing away from the first glass substrate 507. One or more transparent backlight panels 140 are attached to the surface of the second polarizer 501 facing away from the second glass substrate 502. In this embodiment, the transparent backlight panel 140 replaces the backlight module of the traditional LCD screen, thereby making the LCD screen transparent.

[0102] It should be noted that, Figures 1 to 15 In all the diagrams, the optical waveguide 100, recessed structure 102, coupling surface 103, light source 300, and other structures are shown for illustrative purposes only and do not represent actual dimensions and proportions.

[0103] electronic devices

[0104] This application also provides an electronic device including a display screen, which includes the aforementioned transparent LCD screen. A transparent backlight panel provides backlighting for the display screen, thereby enabling the display screen to be transparent.

[0105] Exemplary VR device

[0106] This application also provides a VR (Virtual Reality) device. In one embodiment, the VR device includes an image source, which includes the aforementioned transparent backlight panel. The transparent backlight panel provides backlight to the image source, thereby enabling the image source to be transparent.

[0107] Exemplary AR devices

[0108] Sixthly, this application provides an AR (Augmented Reality) device. In one embodiment, the AR device includes an image source, which includes the aforementioned transparent backlight panel. The transparent backlight panel provides backlight to the image source, thereby enabling the image source to become transparent for augmented reality display.

[0109] Exemplary transparent backlight panel manufacturing process

[0110] This invention provides a transparent backlight panel manufacturing process, in one embodiment, such as... Figure 16 As shown, the manufacturing process of this transparent backlight panel includes:

[0111] Step 160: Moldulate a structure array consisting of multiple recessed structures on the first surface of the optical waveguide.

[0112] Step 161: Deposit a film layer on multiple recessed structures. The film layer is used to reflect illumination light with preset characteristics in the optical waveguide.

[0113] Step 162: Cover the structure array with a filling structure, such that the filling structure faces away from the surface of the structure array and is parallel to the second surface of the optical waveguide; wherein the second surface is located on the opposite side of the first surface.

[0114] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0115] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0116] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0117] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features of the invention herein.

[0118] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A transparent backlight panel, characterized in that, include: An optical waveguide, wherein a plurality of recessed structures are formed on the first surface of the optical waveguide, and the plurality of recessed structures form a structural array; A light selective film is disposed on the recessed structure. The light selective film is configured to reflect illumination light with preset characteristics in the optical waveguide. The reflectivity of the light selective film for illumination light with an incident angle of 0° to 70° is any value between 1% and 6%, and the reflectivity of the light selective film for illumination light with an incident angle of 70° to 90° is less than or equal to 10%. The wavelength bandwidth of the light selective film is 400nm to 700nm. as well as A transparent filling structure covers the structure array; the surface of the filling structure facing away from the structure array is parallel to the second surface of the optical waveguide; wherein the second surface is located on the opposite side of the first surface. The light source is configured to emit the illumination light; A first polarizer is disposed between the side of the optical waveguide and the light source; wherein the first polarizer polarizes the illumination light emitted from the light source, so that the illumination light coupled into the optical waveguide is polarized illumination light of the first polarization state. In this process, the illumination light in the optical waveguide is reflected by the structure array, breaking the total internal reflection propagation, and then coupled out of the optical waveguide from the lower second surface. The illumination light in the optical waveguide is refracted through the structure array and then enters the filling structure for total internal reflection propagation or is coupled out directly from the planar surface. The luminous flux of the illumination light coupled out from the lower second surface is the same as the luminous flux of the illumination light coupled out from the upper planar surface.

2. The transparent backlight panel according to claim 1, characterized in that, A portion of the side surface of the optical waveguide is a coupling surface, which is configured to couple the illumination light into the optical waveguide for total internal reflection propagation.

3. The transparent backlight panel according to claim 2, characterized in that, The coupling surface is an arc surface that is recessed into the optical waveguide.

4. The transparent backlight panel according to claim 2, characterized in that, The two interfaces between the coupling surface and the second and first surfaces of the optical waveguide are both curved surfaces.

5. The transparent backlight panel according to claim 2, characterized in that, A portion of the side surface of the optical waveguide is a reflective surface, and the reflective surface is configured to reflect the illumination light.

6. The transparent backlight panel according to claim 5, characterized in that, The reflecting surface is an arc surface that is concave into the optical waveguide.

7. The transparent backlight panel according to claim 5, characterized in that, The two interfaces between the reflective surface and the second and first surfaces of the optical waveguide are both curved surfaces.

8. The transparent backlight panel according to claim 1, characterized in that, The difference between the first refractive index of the filling structure and the second refractive index of the optical waveguide is any value between 0 and 0.

3.

9. The transparent backlight panel according to claim 1, characterized in that, The recessed structure is shaped like a polygonal pyramid or prism that is recessed into the optical waveguide. The base angle of the recessed structure is any value between 15° and 45°, and the shapes of multiple recessed structures are similar.

10. The transparent backlight panel according to claim 9, characterized in that, Different recessed structures are arranged adjacent to each other, and the length of the longest side of the bottom surface of the recessed structure is any value between 20um and 70um.

11. The transparent backlight panel according to claim 9, characterized in that, The spacing between different recessed structures is equal, and the sum of the length of the longest side of the bottom surface of the recessed structure and the spacing is any value between 20um and 70um.

12. The transparent backlight panel according to claim 9, characterized in that, The length of the longest side of the bottom surface of the recessed structure, plus the sum of the distances between different recessed structures, is any value between 20µm and 70µm.

13. The transparent backlight panel according to claim 1, characterized in that, The shape of the recessed structure is a polygonal pyramid or prism that is recessed into the optical waveguide, and the base angle of the recessed structure is any value between 15° and 45°. The recessed structures are arranged adjacent to each other, and the length of the longest side of the bottom surface of the recessed structure is any value between 20um and 70um.

14. The transparent backlight panel according to claim 1, characterized in that, The recessed structure is an arc surface that is recessed into the optical waveguide, and the radii of curvature of multiple recessed structures are the same.

15. The transparent backlight panel according to claim 14, characterized in that, Different recessed structures are arranged adjacent to each other, and the radius of curvature of the recessed structure is any value from 20um to 70um.

16. The transparent backlight panel according to claim 14, characterized in that, The spacing between different recessed structures is equal, and the sum of the radius of curvature of the recessed structure and the spacing is any value between 20um and 70um.

17. The transparent backlight panel according to claim 14, characterized in that, The sum of the radius of curvature of the concave structure and the distance between different concave structures is any value between 20 μm and 70 μm.

18. The transparent backlight panel according to claim 1, characterized in that, The shape of the recessed structure is an arc surface that is recessed into the optical waveguide; The different recessed structures are arranged adjacent to each other, and the radius of curvature of the recessed structure is any value from 20um to 70um.

19. A multi-layer backlight panel, characterized in that, include A plurality of transparent backlight panels as described in any one of claims 1 to 18, wherein the plurality of transparent backlight panels are stacked on top of each other.

20. A transparent LCD screen, characterized in that, include Display module; as well as One or more transparent backlight panels as described in any one of claims 1 to 18, the transparent backlight panels being used to provide backlight for the display module.

21. A transparent LCD screen according to claim 20, characterized in that, The display module includes First glass substrate; The second glass substrate is arranged parallel to the first glass substrate. A first alignment film is attached to the surface of the first glass substrate facing the second glass substrate; A color filter is attached to the surface of the second glass substrate facing the first glass substrate; The second alignment film is attached to the surface of the color filter facing the first glass substrate; A liquid crystal layer is disposed between the first alignment film and the second alignment film; as well as The second polarizer is attached to the surface of the second glass substrate facing away from the first glass substrate; One or more of the transparent backlight panels are attached to the surface of the second polarizer facing away from the second glass substrate.

22. An electronic device, characterized in that, include The display screen includes a transparent LCD screen as described in claim 20 or 21.

23. A VR device, characterized in that, include An image source, the image source comprising a transparent backlight panel as claimed in any one of claims 1 to 18, the transparent backlight panel providing backlight for the image source.

24. An AR device, characterized in that, include An image source, the image source comprising a transparent backlight panel as claimed in any one of claims 1 to 18, the transparent backlight panel providing backlight for the image source.

25. A manufacturing process for a transparent backlight panel, characterized in that, For manufacturing the transparent backlight panel as described in claim 1, the manufacturing process of the transparent backlight panel includes: A structural array consisting of multiple recessed structures is molded on the first surface of the optical waveguide; A film layer is deposited on the plurality of said recessed structures, the film layer being used to reflect illumination light with predetermined characteristics in the optical waveguide; as well as A filling structure is covered on the structure array, such that the filling structure faces away from the surface of the structure array and is parallel to the second surface of the optical waveguide; wherein the second surface is located on the opposite side of the first surface.

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