CN115524779A

CN115524779A - Transparent backlight panel and process, transparent LCD screen, electronic equipment and VR/AR equipment

Info

Publication number: CN115524779A
Application number: CN202211048229.3A
Authority: CN
Inventors: 翁志彬; 来颖; 张婧京
Original assignee: Pimax Technology Shanghai Co ltd
Current assignee: Pimax Technology Shanghai Co ltd
Priority date: 2022-08-30
Filing date: 2022-08-30
Publication date: 2022-12-27

Abstract

The application provides a transparent backlight panel, a transparent LCD screen, an electronic device and a VR/AR device. In the transparent backlight panel, each concave structure is a microstructure, the illuminating light is coupled into the optical waveguide for total reflection propagation, and the concave structure of the coating can reflect the illuminating light with preset characteristics, so that the total reflection propagation of the illuminating light is broken, and the illuminating light can be coupled out of the optical waveguide to realize 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 an original opaque backlight module of the LCD screen, so that the whole LCD screen becomes the transparent screen. Because the optical waveguide is transparent and the concave structure of the coating film only reflects the illuminating light with preset characteristics, the display image of the LCD screen is basically not influenced, and environmental objects behind the LCD screen can be seen, thereby manufacturing the transparent LCD screen.

Description

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

Technical Field

The application relates to the technical field of transparent display, in particular to a transparent backlight panel, a transparent backlight panel process, a transparent LCD screen, electronic equipment and VR/AR equipment.

Background

In the field of display technology in recent years, transparent LCD screens are increasingly required by the public. The transparent LCD screen can be applied to many applications, for example, can be applied to augmented reality display, and people can see the display content on the screen while seeing the real scene behind the screen, thereby realizing augmented reality superposition display. How to enable the display screen to be transparent is a technical problem to be solved in the field of practical technology.

Disclosure of Invention

In view of the above, the present application provides a transparent backlight panel and a process, a transparent LCD screen, an electronic device, and a VR/AR device, which can be used for manufacturing the transparent LCD screen to realize the transparency of the LCD screen.

In a first aspect, the present application provides a transparent backlight panel, including: the optical waveguide comprises an optical waveguide body, wherein a plurality of sunken structures are formed in the first surface of the optical waveguide body, and form a structure array; a light selective film disposed on the recessed structure, the light selective film configured to: reflecting the illumination light of the preset characteristic in the optical waveguide; and a filling structure of transparent material, the filling structure covering the structure array; the surface of the filling structure, which faces away from the structure array, is parallel to the second surface of the optical waveguide; wherein the second surface is located opposite the first surface.

In the aspect, each concave structure is a microstructure, the illumination light is coupled into the optical waveguide for total reflection propagation, and the concave structure of the coating can reflect the illumination light with preset characteristics, so that the total reflection propagation of the illumination light is broken, and the illumination light can be coupled out of the optical waveguide to realize illumination. The size of the recessed structure can be designed to be small so that ambient light or image light is not affected when passing through the transparent backlight panel. When the illumination light irradiates on the structure array formed by the concave structures, if part of the illumination light meets the preset characteristics, the illumination light is reflected by the light selective film, and if the reflected illumination light does not meet the total reflection propagation condition any more, the illumination light is coupled out of the optical waveguide from the second surface. If the part of the illuminating light in the optical waveguide is not in accordance with the preset characteristics when the illuminating light irradiates on the light selection film, refraction occurs, the refracted illuminating light enters the filling structure, if the illuminating light entering the filling structure is in accordance with the total reflection conditions of the filling structure, total reflection propagation is carried out, and if the illuminating light is not in accordance with the total reflection conditions, the illuminating light is emitted from the filling structure to the plane surface of the structure array. When the illumination light which is totally reflected and propagated in the filling structure is irradiated on the light selection film, if part of the illumination light meets the preset characteristics, the illumination light is reflected, and if the illumination light after reflection does not meet the total reflection conditions of the filling structure any more, the illumination light is coupled out from the plane surface. When the illumination light in the filling structure is irradiated on the light selection film, if part of the illumination light does not accord with the preset characteristic, refraction occurs, and the refracted illumination light enters the light guide. Through simulation calculation, the luminous flux of the illumination light emitted from the second surface of the light guide and the luminous flux of the illumination light emitted from the plane surface of the filling structure are basically the same, so that both surfaces of the transparent backlight panel can be used for illumination.

When the transparent backlight display panel is used, the transparent backlight display panel is used as a backlight plate of the LCD screen to provide illumination for the LCD screen, and replaces an original opaque backlight module of the LCD screen, so that the whole LCD screen becomes the transparent screen. Because the optical waveguide is transparent and the concave structure of the coating only reflects the illuminating light with preset characteristics, the display image of the LCD screen is not affected basically, and the environmental object behind the LCD screen can be seen, thereby manufacturing the transparent LCD screen.

With reference to the first aspect, in a possible implementation manner, a part of the side surface of the optical waveguide is a coupling-in surface, and the coupling-in surface is configured to couple the illumination light into the optical waveguide for total reflection propagation.

With reference to the first aspect, in one possible implementation manner, the coupling-in surface is a cambered surface recessed into the optical waveguide.

With reference to the first aspect, in a possible implementation manner, two interfaces between the coupling-in surface and the second surface and between the coupling-in surface and the first surface of the optical waveguide are both arc surfaces.

With reference to the first aspect, in one possible implementation manner, a part of the side surface of the optical waveguide is a reflecting surface configured to reflect the illumination light.

With reference to the first aspect, in a possible implementation manner, the reflecting surface is an arc surface that is recessed into the optical waveguide.

With reference to the first aspect, in a possible implementation manner, two interfaces between the reflection surface and the second surface and between the reflection surface and the first surface of the optical waveguide are both arc surfaces.

With reference to the first aspect, in one possible implementation manner, a difference between the first refractive index of the filling structure and the second refractive index of the optical waveguide is any one of values from 0 to 0.3.

With reference to the first aspect, in a possible implementation manner, the shape of the recessed structure is a polygonal pyramid or a polygonal prism recessed toward the inside of the optical waveguide, a base angle of the recessed structure is any one of values from 15 ° to 45 °, and the shapes of the plurality of recessed structures are similar one to one.

With reference to the first aspect, in a possible implementation manner, different ones of the recessed structures are adjacently disposed, and a length of a longest side of a bottom surface of each of the recessed structures is any one of 20um to 70 um.

With reference to the first aspect, in a possible implementation manner, different ones of the recessed structures have equal separation distances, and a sum of a length of a longest side of a bottom surface of the recessed structure and the separation distance is any one of values from 20um to 70 um.

With reference to the first aspect, in a possible implementation manner, a sum of a length of a longest side of a bottom surface of each of the recess structures and a distance between different recess structures is any one of 20um to 70 um.

With reference to the first aspect, in a possible implementation manner, the shape of the recessed structure is a polygonal pyramid or a polygonal prism recessed towards the inside of the optical waveguide, and a base angle of the recessed structure is any value from 15 ° to 45 °; wherein, it is different adjacent setting between the sunk structure, the length of the longest side of sunk structure's bottom surface is any value in 20um ~ 70 um.

With reference to the first aspect, in a possible implementation manner, the shape of the recessed structure is an arc surface recessed towards the inside of the optical waveguide, and the curvature radii of the plurality of recessed structures are the same.

With reference to the first aspect, in a possible implementation manner, different ones of the recessed structures are adjacently disposed, and a curvature radius of the recessed structures is any value of 20um to 70 um.

With reference to the first aspect, in a possible implementation manner, different ones of the recessed structures have equal separation distances, and a sum of a radius of curvature of the recessed structures and the separation distances is any one of values from 20um to 70 um.

With reference to the first aspect, in a possible implementation manner, a sum of a radius of curvature of the concave structures and a distance between different concave structures is any one of 20um to 70 um.

With reference to the first aspect, in a possible implementation manner, the shape of the recessed structure is an arc surface recessed towards the inside of the optical waveguide; wherein, it is different adjacent setting between the sunk structure, the radius of curvature of sunk structure is arbitrary value in 20um ~ 70 um.

With reference to the first aspect, in one possible implementation manner, 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 reflectance of the light selective film for the illumination light with an incident angle of 70 ° to 90 ° is less than or equal to 10%.

With reference to the first aspect, in one possible implementation manner, the light selective film has a reflectance of any one of 1% to 6% with respect to the illumination light having an incident angle of 0 ° to 70 °, and the light selective film has a reflectance of any one of 10% to 45% with respect to the illumination light having an incident angle of 70 ° to 90 °.

With reference to the first aspect, in one possible implementation manner, the wavelength bandwidth of the light selective film is 400nm to 700nm.

With reference to the first aspect, in a possible implementation manner, the method further includes: a light source configured to emit the illumination light; and a first polarizing plate disposed between a side of the optical waveguide and the light source.

In a second aspect, the present application provides a multilayer backlight panel, which includes the foregoing transparent backlight panel, and a plurality of the transparent backlight panels are stacked on top of each other.

The second aspect includes all the structures of the first aspect, and the technical effects of the second aspect are not described herein again.

In a third aspect, the present application provides a transparent LCD screen comprising: a display module; and one or more of the foregoing transparent backlight panels, the transparent backlight panels being configured to provide backlight for the display module.

The third aspect includes all the structures of the first aspect, and the technical effects of the third aspect are not described herein again.

With reference to the third aspect, in a possible implementation manner, the display module includes: a first glass substrate; the second glass substrate is arranged in parallel with the first glass substrate; the first alignment film is attached to the surface, facing the second glass substrate, of the first glass substrate; the color filter is attached to the surface, facing the first glass substrate, of the second glass substrate; the second alignment film is attached to the surface, facing the first glass substrate, of the color filter; a liquid crystal layer disposed between the first alignment film and the second alignment film; the second polaroid is attached to the surface, opposite to the first glass substrate, of the second glass substrate; wherein one or more transparent backlight panels are attached to the surface of the second polarizer opposite to the second glass substrate.

In a fourth aspect, the present application provides an electronic device comprising: and the display screen comprises the transparent LCD screen.

The fourth aspect includes the whole structure of the first aspect, and the technical effects of the fourth aspect are not described herein.

In a fifth aspect, the present application provides a VR device comprising: an image source comprising the aforementioned transparent backlight panel, the transparent backlight panel providing backlight for the image source.

The fifth aspect includes all the structures of the first aspect, and the technical effects of the fifth aspect are not described herein again.

In a sixth aspect, the present application provides an AR device, comprising: an image source comprising the aforementioned transparent backlight panel, the transparent backlight panel providing backlight for the image source.

The sixth aspect includes the entire structure of the first aspect, and the technical effects of the sixth aspect are not described in detail herein.

In a seventh aspect, the present application provides a process for manufacturing a transparent backlight panel, including: molding a structure array composed of a plurality of recess structures on a first surface of the optical waveguide; coating a film layer on the plurality of concave structures, wherein the film layer is used for reflecting illumination light with preset characteristics in the optical waveguide; covering a filling structure on the structure array, and enabling the filling structure to be opposite to the surface of the structure array and to be parallel to the second surface of the optical waveguide; wherein the second surface is located opposite the first surface.

The seventh aspect is the manufacturing method of the first aspect, and the technical effects of the seventh aspect are not described herein again.

Drawings

Fig. 1 is a schematic structural diagram of a transparent backlight panel according to an embodiment of the present application.

Fig. 2 is a schematic structural view illustrating a concave structure of a polygonal pyramid or a polygonal prism according to an embodiment of the present disclosure.

Fig. 3 is a schematic structural view illustrating a concave structure provided in an embodiment of the present application as a polygonal pyramid or a polygonal prism.

Fig. 4 is a schematic structural view illustrating a concave structure of a polygonal pyramid or a polygonal prism according to an embodiment of the present disclosure.

Fig. 5 is a schematic structural view illustrating a concave structure as a concave cambered surface according to an embodiment of the present application.

Fig. 6 is a schematic structural view illustrating a concave structure of a concave cambered surface according to an embodiment of the present application.

Fig. 7 is a schematic structural view illustrating a concave structure of a concave cambered surface according to an embodiment of the present application.

Fig. 8 is a schematic structural view illustrating a concave structure of a concave cambered surface according to an embodiment of the present application.

Fig. 9 is a schematic diagram of a general optical path provided by an embodiment of the present application.

Fig. 10 is a schematic structural diagram of a coupling-in surface and a reflecting surface according to an embodiment of the present application.

Fig. 11 is a schematic structural diagram of another coupling-in surface and a reflection surface according to an embodiment of the present application.

Fig. 12 is a schematic structural view illustrating a concave structure of a concave prism according to an embodiment of the present application.

Fig. 13 is a schematic structural view illustrating a concave structure of a concave pyramid according to an embodiment of the present disclosure.

Fig. 14 is a schematic structural diagram of a multi-layer backlight panel according to an embodiment of the present application.

Fig. 15 is a schematic structural diagram of a transparent LCD screen according to an embodiment of the present application.

Fig. 16 is a flowchart illustrating a manufacturing process of a transparent backlight panel according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Exemplary transparent backlight Panel

In one embodiment, as shown in fig. 1, the transparent backlight panel includes: an optical waveguide 100, a light selective film, and a filling structure 200 of a transparent material.

The first surface of the optical waveguide 100 is formed with a plurality of recessed structures 102, and the plurality of recessed structures 102 form a structure array. A light selective film is disposed on the recessed structure 102, the light selective film configured to: reflecting the illumination light of the predetermined characteristic in the light guide 100. The fill structure 200 overlies the array of structures. The filling structures 200 face away from the surface of the array of structures and are parallel to the second surface 101 of the optical waveguide 100. Wherein the second surface 101 is located opposite the first surface.

In this embodiment, each of the recessed structures 102 is a microstructure, the illumination light is coupled into the optical waveguide 100 for total reflection propagation, and the coated recessed structure 102 can reflect the illumination light with a preset characteristic, so as to break the total reflection propagation of the illumination light, and enable the illumination light to be coupled out of the optical waveguide 100 for illumination. The size of the recessed structures 102 can be designed to be small so that ambient light or image light is not affected when passing through the transparent backlight panel.

Specifically, when the illumination light propagating through the optical waveguide 100 is totally reflected and irradiated onto the structural array composed of the recessed structures 102, if a part of the illumination light meets the predetermined characteristic, the illumination light is reflected by the light selective film, and if the illumination light after reflection no longer meets the total reflection propagation condition, the illumination light is coupled out of the optical waveguide 100 from the second surface 101. If the illumination light in the optical waveguide 100 does not meet the predetermined characteristic when it is irradiated on the light selective film, refraction occurs, the illumination light after refraction enters the filling structure 200, if the illumination light entering the filling structure 200 meets the total reflection condition of the filling structure 200, the illumination light is transmitted by total reflection, and if the illumination light does not meet the total reflection condition, the illumination light is emitted from the filling structure 200 back to the planar surface 201 of the structure array.

When the illumination light propagating through the filling structure 200 by total reflection is irradiated on the light selective film, part of the illumination light is reflected if the predetermined characteristic is satisfied, and the reflected illumination light is coupled out from the planar surface 201 if the total reflection condition of the filling structure 200 is no longer satisfied. When the illumination light in the filling structure 200 is irradiated on the light selective film, if a part of the illumination light does not meet the predetermined characteristics, refraction occurs, and the refracted illumination light is incident on the light guide 100. Through simulation calculations, the luminous fluxes 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 are substantially the same, and thus both surfaces of the transparent backlight panel can be used for illumination.

The illumination light with the preset characteristics may be light with a preset incident angle, light with a preset wavelength band, light with a preset polarization, light with a preset incident angle, light with a preset polarization and a preset wavelength band, and light with other characteristics is not described herein again. Ambient light is substantially transmitted through the light guide 100, the array of structures, and the fill structures 200, making the transparent backlight display panel substantially transparent as a whole. And the planar surface 201 of the filling structure 200 facing away from the structure array is parallel to the second surface 101 of the light guide 100, so that when the ambient light sequentially passes through the light guide 100 and the filling structure 200, the optical path of the ambient light is not substantially changed, i.e., when the ambient object behind is viewed through the transparent backlight display panel, the distortion phenomenon does not occur, and thus the transparent backlight display panel can be used as a transparent backlight.

When the transparent backlight display panel is used, the transparent backlight display panel is used as a backlight plate of an LCD screen to provide illumination for the LCD screen, and replaces an original opaque backlight module of the LCD screen, so that the whole LCD screen becomes the transparent screen. Because the optical waveguide is transparent and the concave structure of the coating only reflects the illuminating light with preset characteristics, the display image of the LCD screen is not affected basically, and the environmental object behind the LCD screen can be seen, thereby manufacturing the transparent LCD screen.

In one embodiment, as shown in FIG. 1, a portion of the side surface of the light guide 100 is a coupling-in surface 103, and the coupling-in surface 103 is configured to couple illumination light into the light guide 100 for total reflection propagation. The coupling-in surface 103 is not limited in shape, and may be a plane or an arc surface.

In one embodiment, as shown in fig. 1, the coupling-in surface 103 is a curved surface recessed into the light guide 100, and the coupling-in surface 103 is a concave lens, so that more illumination light can be coupled in, i.e. the collection capability of the illumination light is improved.

In an embodiment, as shown in fig. 1, the two interfaces between the coupling-in surface 103 and the second surface 101 and the first surface of the optical waveguide 100 are both arc surfaces, and the arc interfaces can increase the effective area of the inner surface of the optical waveguide 100, so that the total reflection propagation times of the illumination light totally reflected and propagated in the optical waveguide 100 are greater, and the illumination light is not easily coupled out from the interfaces, that is, the coupling-out amount of the illumination light from the second surface 101 or the planar surface 201 is increased.

In one embodiment, as shown in FIG. 1, a portion of the side surface of the light guide 100 is a reflective surface 106, the reflective surface 106 being configured to reflect illumination light. The present embodiment can reflect the illumination light irradiated to the side surface of the optical waveguide 100 in the optical waveguide 100 back to the optical waveguide 100 for continuous total reflection propagation, thereby improving the light energy utilization rate. Specifically, all the side surfaces of the optical waveguide 100 except the decoupling surface 103 may be provided as the reflecting surfaces 106.

In one embodiment, as shown in fig. 1, the reflecting surface 106 is a curved surface recessed into the optical waveguide 100, so that the reflecting surface 106 is a concave lens, and thus more illuminating light can be reflected, i.e. the utilization rate of the illuminating light is improved.

In an embodiment, as shown in fig. 1, 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, and the arc interfaces can increase the effective area of the inner surface of the optical waveguide 100, so that the total reflection propagation times of the illumination light totally reflected and propagated in the optical waveguide 100 are more, and the illumination light is not easily coupled out from the interfaces, that is, the coupling amount of the illumination light from the second surface 101 or the planar surface 201 is increased.

In an embodiment, the difference between the first refractive index of the filling structure 200 and the second refractive index of the optical waveguide is any one of 0 to 0.3, which can ensure that the filling structure 200 has a high light transmittance. And the smaller refractive index difference value can ensure that the illuminating light does not have too large refraction angle in the process of transferring the medium, and the smaller refraction angle can ensure that the illuminating light can still be subjected to total reflection propagation after the medium is transferred. Specifically, the optical waveguide 100 may be made of PMMA, and the filling structure 200 may be UV glue.

In one embodiment, as shown in fig. 1, the shape of the recessed structure 102 is a polygonal pyramid or a polygonal prism recessed toward the inside of the optical waveguide, the base angle of the recessed structure is any one of 15 ° to 45 °, and the shapes of the plurality of recessed structures are similar one to one.

In the present embodiment, the structural array formed by the concave structures 102 with the shape has better reflection efficiency for the illumination light, and has less influence on the transmitted ambient light and the LCD image light. The shapes of the plurality of concave structures 102 are similar, that is, the base angles of the plurality of polygonal pyramids or polygonal prisms are correspondingly the same, so that the transmitted ambient light and the transmitted LCD image light are more uniform, and the phenomenon of uneven brightness when the transparent backlight panel is seen through is avoided. The base angle of the polygonal pyramid or the polygonal prism is 15 ° to 45 °, which is the total reflection angle range of the optical waveguide 100 in general, and the surface angle range enables illumination light propagating by total reflection to be irradiated on the prism surface of the polygonal pyramid or the polygonal prism for reflection or refraction.

In one embodiment, as shown in fig. 1, different recessed structures 102 are disposed adjacent to each other, and the length of the longest side of the bottom surface of the recessed structure 102 is any value from 20um to 70 um. In this embodiment, the neighboring recessed structures 102 form a densely arranged structure array, and the greater number of recessed structures 102 can improve the reflection efficiency of the illumination light. And the size of the single concave structure 102 is larger than 20um, so that the diffraction phenomenon can be avoided, and the size of the single concave structure 102 smaller than 70um is smaller than the size of a single pixel of the LCD, when the transparent backlight panel is applied to an LCD screen, the size of the concave structure 102 smaller than the size of the single pixel does not affect the display content of the LCD.

In one embodiment, as shown in fig. 2, the spacing distances between different concave structures 102 are equal, and the sum of the length of the longest side of the bottom surface of the concave structure 102 and the spacing distance is any value from 20um to 70 um. In this embodiment, the recessed structures 102 are uniformly distributed at equal intervals, so that the transmitted ambient light and the transmitted LCD image light are more uniform, and the phenomenon of uneven brightness during the process of viewing the transparent backlight panel is avoided. And the process requirement can be reduced without densely and adjacently arranged structure arrays. The total size of the distance between the concave structures 102 and the distance between the concave structures is within the range of 20um to 70um, so that the diffraction phenomenon can be avoided, and the influence on the display content caused by the size of the concave structures larger than the size of a single pixel can be avoided.

In one embodiment, as shown in fig. 3, the sum of the length of the longest side of the bottom surface of the recessed structures 102 and the distance between different recessed structures 102 is any value from 20um to 70 um. In this embodiment, the recess structures 102 may be distributed non-equidistantly, so as to reduce the requirement of the manufacturing process and reduce the manufacturing cost. The total size of the distance between the concave structures 102 and the distance between the concave structures is within the range of 20um to 70um, so that the diffraction phenomenon can be avoided, and the influence on the display content caused by the size of the concave structures larger than the size of a single pixel can be avoided.

In one embodiment, as shown in fig. 4, the recessed structure 102 is in the shape of a polygonal pyramid or a polygonal prism recessed toward the inside of the optical waveguide 100, and the base angle of the recessed structure 102 is any one of values from 15 ° to 45 °. Wherein, different recessed structures 102 are adjacently arranged, and the length of the longest side of the bottom surface of the recessed structure 102 is any value of 20 um-70 um.

In the present embodiment, the structural array formed by the concave structures 102 with the shape has better reflection efficiency for the illumination light, and has less influence on the transmitted ambient light and the LCD image light. The concave structures 102 arranged adjacently form a densely arranged structure array, and the reflection efficiency of the illumination light can be improved by the plurality of concave structures 102. The shapes and sizes of the concave structures 102 can be different from each other, that is, the base angles of a plurality of polygonal pyramids or polygonal prisms can be different, so that the requirements of the manufacturing process can be reduced, and the manufacturing cost can be reduced. The base angle of the polygonal pyramid or the polygonal prism is 15 ° to 45 °, which is the total reflection angle range of the optical waveguide 100 in general, and the surface angle range enables illumination light propagating by total reflection to be irradiated on the prism surface of the polygonal pyramid or the polygonal prism for reflection or refraction. The size of the single concave structure 102 is larger than 20um, so that the diffraction phenomenon can be avoided, the size of the single concave structure 102 smaller than 70um is smaller than the size of a single pixel of the LCD, and when the transparent backlight panel is applied to an LCD screen, the size of the concave structure 102 smaller than the size of the single pixel does not affect the display content of the LCD.

In one embodiment, as shown in fig. 5, the recessed structures 102 are curved surfaces recessed into the optical waveguide 100, and the curvature radius of the plurality of recessed structures 102 is the same.

In the present embodiment, the structural array formed by the concave structures 102 in the shape has a better reflection efficiency for the illumination light, and has a smaller influence on the transmitted ambient light and the LCD image light. Moreover, the concave structures 102 with similar shapes can make the transmitted ambient light and the transmitted LCD image light more uniform, and avoid the phenomenon of uneven brightness when the transparent backlight panel is seen through.

In one embodiment, as shown in fig. 5, different concave structures 102 are disposed adjacently, and the radius of curvature of the concave structures 102 is any value between 20um and 70 um. In this embodiment, the neighboring recessed structures 102 form a densely arranged structure array, and the greater number of recessed structures 102 can improve the reflection efficiency of the illumination light. And the size of the curvature radius of the single concave structure 102 is larger than 20um, so that the diffraction phenomenon can be avoided, the size of the curvature radius of the single concave structure 102 smaller than 70um is smaller than the size of a single pixel of the LCD, and when the transparent backlight panel is applied to an LCD screen, the size of the concave structure 102 smaller than the size of the single pixel does not affect the display content of the LCD.

In one embodiment, as shown in fig. 6, the different recessed structures 102 are spaced apart by the same distance, and the sum of the radius of curvature of the recessed structures 102 and the distance is any value from 20um to 70 um. In this embodiment, the recessed structures 102 are uniformly distributed at equal intervals, so that the transmitted ambient light and the transmitted LCD image light are more uniform, and the phenomenon of uneven brightness during the process of viewing the transparent backlight panel is avoided. And the process requirement can be reduced without densely and adjacently arranged structure arrays. The total size of the distance between the concave structures 102 and the distance between the concave structures is within the range of 20um to 70um, so that the diffraction phenomenon can be avoided, and the influence on the display content caused by the size of the concave structures larger than the size of a single pixel can be avoided.

In one embodiment, as shown in FIG. 7, the sum of the radii of curvature of the recessed structures 102 and the distances separating the different recessed structures is any value from 20um to 70 um. In this embodiment, the concave structures 102 may be distributed non-equidistantly, so as to reduce the requirement of the manufacturing process and reduce the manufacturing cost. The total size of the distance between the concave structures 102 and the distance between the concave structures is within the range of 20um to 70um, so that the diffraction phenomenon can be avoided, and the influence on the display content caused by the size of the concave structures larger than the size of a single pixel can be avoided.

In one embodiment, as shown in FIG. 8, the recessed feature 102 is shaped as a curved surface recessed into the optical waveguide 100. Wherein, different recessed structures 102 are adjacently arranged, and the curvature radius of the recessed structures 102 is any value of 20 um-70 um.

In the present embodiment, the structural array formed by the concave structures 102 in the shape has a better reflection efficiency for the illumination light, and has a smaller influence on the transmitted ambient light and the LCD image light. The concave structures 102 arranged adjacently form a densely arranged structure array, and the reflection efficiency of the illumination light can be improved by the plurality of concave structures 102. The curvature radius of each concave structure 102 may be different from each other, so as to reduce the requirement of the manufacturing process and the manufacturing cost. The size of the single concave structure 102 is larger than 20um, so that the diffraction phenomenon can be avoided, the size of the single concave structure 102 smaller than 70um is smaller than the size of a single pixel of the LCD, and when the transparent backlight panel is applied to an LCD screen, the size of the concave structure 102 smaller than the size of the single pixel does not affect the display content of the LCD.

In some embodiments, where the recessed structures are polypyramids or polyprisms and all polypyramids or polyprisms are similar in shape, where all polypyramids or polyprisms are similar in shape and immediately adjacent, where all polypyramids or polyprisms are similar in shape and equally spaced, where the recessed structures are recessed arcs and all recessed arc shapes are similar, where all recessed arc shapes are similar and immediately adjacent, and where all recessed arc shapes are similar in shape and equally spaced. The embodiments in the six cases have high manufacturing process precision, so the requirement on the coating process is higher. The preset characteristics include: the reflectance of the light selective film with respect to illumination light having an incident angle of 0 DEG to 70 DEG is any one of values from 1% to 6%, and the reflectance of the light selective film with respect to illumination light having an incident angle of 70 DEG to 90 DEG is 10% or less. In the embodiment, only the illumination light has low reflectivity, so most of the ambient light and the LCD image light can transmit the light selection film, and the ambient light and the LCD image light can reach high transmissivity.

In some embodiments, in the case that all the polygonal pyramids or polygonal prisms are similar in shape and may have different intervals, in the case that all the polygonal pyramids or polygonal prisms may have different shapes and be closely adjacent, in the case that all the concave arc shapes are similar in shape and may have different intervals, and in the case that all the concave arc shapes may be different and be closely adjacent, the manufacturing process accuracy per se of the embodiments of these four cases is not high, and thus the requirement on the coating process is not high. The preset characteristics include: the reflectivity of the light selection film to the illumination light with the incident angle of 0-70 degrees is any value from 1% to 6%, and the reflectivity of the light selection film to the illumination light with the incident angle of 70-90 degrees is any value from 10% to 45%, so that high transmissivity of the ambient light and the LCD image light can be ensured.

In one embodiment, the wavelength bandwidth of the light selective film is 400nm to 700nm, i.e. the light selective film only acts on the illumination light in the visible wavelength band to realize the illumination function. For example, when it is desired to introduce an infrared function into a transparent LCD screen, the light selective film does not affect the infrared function.

In one embodiment, as shown in fig. 1 to 8, the transparent backlight panel further 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 light guide 100 and the light source 300.

In this embodiment, the first polarizer 400 polarizes the illumination light emitted from the light source 300, so that the illumination light coupled into the optical waveguide 100 is polarized illumination light in the first polarization state. Since the reflection requirement of the film system of the light selective film plated by the concave structure 102 is better realized under polarized light, the polarized illumination light can reduce the plating requirement of the light selective film. Also, since the backlight required for the LCD screen is polarized light, the first polarizer 400 allows the transparent backlight panel to provide polarized illumination light to the LCD screen.

In an embodiment, the predetermined characteristics include: the light selective film in the present application has a reflectance of 1% to 6% for illumination light in the first polarization state with an incident angle of 0 ° to 70 °, and a reflectance of 10% or less for illumination light in the first polarization state with an incident angle of 70 ° to 90 °, so that the light selective film does not substantially affect ambient light, and the transmittance of ambient light can be further improved.

In an embodiment, the predetermined characteristic includes: the light selective film in the present application has a reflectance of 1% to 6% for the illumination light of the first polarization state with an incident angle of 0 ° to 70 °, and a reflectance of 10% to 45% for the illumination light of the first polarization state with an incident angle of 70 ° to 90 °, so that the light selective film does not substantially affect the ambient light, and the transmittance of the ambient light can be further improved.

In one embodiment, the optical path diagram is shown in fig. 9, and the approximate optical path of the illumination light emitted from the light source 300 is indicated by a dotted line with an arrow, and the illumination light enters the optical waveguide 100 to propagate through total reflection. After being reflected by the structure array, a part of the illumination light in the optical waveguide 100 breaks through total reflection propagation and is coupled out of the optical waveguide 100 from the second surface 101 below, and after being refracted through the structure array, a part of the illumination light in the optical waveguide 100 enters the filling structure 200 for total reflection propagation or is directly coupled out from the planar surface 201. When the illumination light in the filling structure 200 is irradiated on the structure array, a part of the illumination light is reflected, breaks the total reflection propagation, and is coupled out from the planar surface 201, and a part of the illumination light is refracted through the structure array and enters the optical waveguide 100. By simulation, the luminous flux of the illumination light coupled out from the lower second surface 101 of the transparent backlight panel and the luminous flux of the illumination light coupled out from the upper planar surface 201 are substantially the same.

In one embodiment, as shown in fig. 10 and 11, the coupling-in surface 103 may be two planes with included angles, or may be a plane; the reflecting surface 106 may be two planes with an included angle or may be a single plane. When the coupling-in surface 103 and the reflecting surface 106 are both two planes, the difficulty of the manufacturing process can be reduced, so that the cost of the device is reduced, and the loss of the illumination light propagated by the total reflection in the optical waveguide is reduced to a certain extent. When the coupling-in surface 103 and the reflecting surface 106 are both single planes, the difficulty of the manufacturing process can be reduced, and thus the cost of the device is reduced.

Fig. 12 shows an embodiment in which the recessed structures 102 are polygonal prisms, and fig. 13 shows an embodiment in which the recessed structures 102 are quadrangular pyramids. Furthermore, the recessed feature 102 may also be a triangular pyramid.

Exemplary Multi-layer backlight Panel

The present application provides a multi-layer backlight panel, which in one embodiment, as shown in fig. 14, includes: a plurality of the transparent backlight panels 140, and the plurality of transparent backlight panels 140 are stacked on each other. The present embodiment may increase the backlight intensity through the plurality of transparent backlight panels 140, thereby providing a brighter backlight.

Exemplary transparent LCD Screen

In an embodiment, the transparent LCD screen includes a display module and one or more of the foregoing transparent backlight panels, and the transparent backlight panels are used for providing backlight for the display module. The transparent LCD screen in the embodiment can be in various screen product forms such as a small display screen, an outdoor display screen, an advertisement screen and the like which are used daily.

In one embodiment, as shown in fig. 15, 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 disposed in 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 a backlight module of a conventional LCD screen, so that the LCD screen is transparent.

It should be noted that in all of fig. 1 to 15, the structures of the optical waveguide 100, the concave structure 102, the coupling-in surface 103, the light source 300, and the like are illustrated only schematically and do not represent actual dimensions or proportions.

Electronic device

The application further provides an electronic device which comprises a display screen, wherein the display screen comprises the transparent LCD screen. The transparent backlight panel provides backlight for the display screen, so that the display screen can be transparent.

Exemplary VR device

The application also provides a VR (Virtual Reality) device, and in an embodiment, the VR device includes an image source, the image source includes the foregoing transparent backlight panel, and the transparent backlight panel provides backlight for the image source, so that the image source can be made transparent.

Exemplary AR device

In a sixth aspect, the present application provides an AR (Augmented Reality) device, in an embodiment, the AR device includes an image source, the image source includes the foregoing transparent backlight panel, and the transparent backlight panel provides backlight for the image source, so that the image source can be made transparent for Augmented Reality display.

Exemplary transparent backlight Panel fabrication Process

There is provided a process for manufacturing a transparent backlight panel, in one embodiment, as shown in fig. 16, the process includes:

step 160, an array of structures comprising a plurality of recessed structures is embossed on the first surface of the optical waveguide.

Step 161, plating a film layer on the plurality of recessed structures, the film layer being used for reflecting the illumination light with the preset characteristics in the optical waveguide.

Step 162, covering the structure array with a filling structure, and enabling the filling structure to be opposite to the surface of the structure array and to be parallel to the second surface of the optical waveguide; wherein the second surface is located opposite the first surface.

The foregoing describes the general principles of the present application in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present application are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present application. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the foregoing disclosure is not intended to be exhaustive or to limit the disclosure to the precise details disclosed.

The block diagrams of devices, apparatuses, systems referred to in this application are only given as illustrative examples and are not intended to require or imply that the connections, arrangements, configurations, etc. must be made in the manner shown in the block diagrams. These devices, apparatuses, devices, systems may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including, but not limited to," and are used interchangeably therewith. The words "or" and "as used herein mean, and are used interchangeably with, the word" and/or, "unless the context clearly dictates otherwise. The word "such as" is used herein to mean, and is used interchangeably with, the phrase "such as but not limited to".

It should also be noted that in the devices, apparatuses, and methods of the present application, each component or step can be decomposed and/or re-combined. These decompositions and/or recombinations are to be considered as equivalents of the present application.

The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modifications, equivalents and the like that are within the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. A transparent backlight panel, comprising:

the optical waveguide comprises an optical waveguide body, wherein a plurality of sunken structures are formed in the first surface of the optical waveguide body, and form a structure array;

a light selective film disposed on the recessed structure, the light selective film configured to: reflecting the illumination light of the preset characteristic in the optical waveguide; and

a filling structure of transparent material, the filling structure covering the structure array; the surface of the filling structure, which faces away from the structure array, is parallel to the second surface of the optical waveguide; wherein the second surface is located opposite the first surface.

2. The transparent backlight panel of claim 1,

part of the side surface of the optical waveguide is a coupling-in surface configured to couple the illumination light into the optical waveguide for total reflection propagation.

3. The transparent backlight panel of claim 2,

the coupling-in surface is a cambered surface which is sunken towards the optical waveguide.

4. The transparent backlight panel of claim 2,

and the two interfaces of the coupling-in surface and the second surface and the first surface of the optical waveguide are cambered surfaces respectively.

5. The transparent backlight panel of claim 2,

a portion of the side surface of the light guide is a reflective surface configured to reflect the illumination light.

6. The transparent backlight panel of claim 5,

the reflecting surface is a cambered surface which is sunken towards the optical waveguide.

7. The transparent backlight panel of claim 5,

and the two interfaces of the reflecting surface and the second surface and the first surface of the optical waveguide are cambered surfaces respectively.

8. The transparent backlight panel of claim 1,

the difference between the first refractive index of the filling structure and the second refractive index of the optical waveguide is any one of values from 0 to 0.3.

9. The transparent backlight panel of claim 1,

the shape of the concave structure is a polygonal pyramid or a polygonal prism which is concave towards the interior of the optical waveguide, the base angle of the concave structure is any value of 15-45 degrees, and the shapes of the concave structures are similar one to one.

10. The transparent backlight panel according to claim 9,

different adjacent setting between the sunk structure, the length of the longest side of sunk structure's bottom surface is arbitrary value in 20um ~ 70 um.

11. The transparent backlight panel according to claim 9,

different the distance apart between the sunk structure equals, the length of the longest side of the bottom surface of the sunk structure and the sum of the distance apart is any value in 20um ~ 70 um.

12. The transparent backlight panel according to claim 9,

the sum of the length of the longest edge of the bottom surface of the concave structure and the distance between different concave structures is any value between 20um and 70 um.

13. The transparent backlight panel of claim 1,

the shape of the concave structure is a polygonal pyramid or a polygonal prism which is concave towards the interior of the optical waveguide, and the base angle of the concave structure is any value of 15-45 degrees;

wherein, it is different adjacent setting between the sunk structure, the length of the longest side of sunk structure's bottom surface is any value in 20um ~ 70 um.

14. The transparent backlight panel of claim 1,

the shape of the concave structure is an arc surface concave towards the interior of the optical waveguide, and the curvature radiuses of the plurality of concave structures are the same.

15. The transparent backlight panel of claim 14,

different adjacent setting between the sunk structure, the radius of curvature of sunk structure is arbitrary value in 20um ~ 70 um.

16. The transparent backlight panel according to claim 14,

different the distance between the concave structures is equal, and the sum of the curvature radius of the concave structures and the distance is any value between 20um and 70 um.

17. The transparent backlight panel of claim 14,

the sum of the curvature radius of the concave structures and the distance between different concave structures is any value between 20um and 70 um.

18. The transparent backlight panel of claim 1,

the shape of the concave structure is an arc surface concave towards the interior of the optical waveguide;

wherein, it is different adjacent setting between the sunk structure, the radius of curvature of sunk structure is arbitrary value in 20um ~ 70 um.

19. The transparent backlight panel according to any one of claims 9, 10, 11, 14, 15 and 16,

the light selective film has a reflectance of 1% to 6% for the illumination light having an incident angle of 0 DEG to 70 DEG, and the reflectance of the light selective film for the illumination light having an incident angle of 70 DEG to 90 DEG is 10% or less.

20. The transparent backlight panel according to any one of claims 12, 13, 17 and 18,

the light selective film has a reflectance of 1% to 6% for the illumination light with an incident angle of 0 DEG to 70 DEG, and has a reflectance of 10% to 45% for the illumination light with an incident angle of 70 DEG to 90 deg.

21. The transparent backlight panel of claim 1,

the wavelength bandwidth of the light selective film is 400 nm-700 nm.

22. The transparent backlight panel of claim 1, further comprising:

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.

23. A multi-layer backlight panel, comprising:

a plurality of the transparent backlight panel of any one of claims 1 to 22, the plurality of transparent backlight panels being disposed on top of one another.

24. A transparent LCD screen, comprising:

a display module; and

one or more transparent backlight panels as claimed in any one of claims 1 to 22 for providing backlight for the display module.

25. A transparent LCD screen according to claim 24, wherein the display module comprises:

a first glass substrate;

the second glass substrate is arranged in parallel with the first glass substrate;

the first alignment film is attached to the surface, facing the second glass substrate, of the first glass substrate;

the color filter is attached to the surface, facing the first glass substrate, of the second glass substrate;

the second alignment film is attached to the surface, facing the first glass substrate, of the color filter;

a liquid crystal layer disposed between the first alignment film and the second alignment film; and

the second polaroid is attached to the surface, opposite to the first glass substrate, of the second glass substrate;

wherein one or more transparent backlight panels are attached to the surface of the second polarizer opposite to the second glass substrate.

26. An electronic device, comprising:

a display screen comprising the transparent LCD screen of claim 24 or 25.

27. A VR device, comprising:

an image source comprising the transparent backlight panel of any of claims 1-22, the transparent backlight panel providing backlighting for the image source.

28. An AR device, comprising:

29. A manufacturing process of a transparent backlight panel is characterized by comprising the following steps:

molding a structure array composed of a plurality of recess structures on a first surface of the optical waveguide;

coating a film layer on the plurality of concave structures, wherein the film layer is used for reflecting illumination light with preset characteristics in the optical waveguide; and

covering a filling structure on the structure array, and enabling the filling structure to be opposite to the surface of the structure array and to be parallel to the second surface of the optical waveguide; wherein the second surface is located opposite the first surface.