WO2020181447A1

WO2020181447A1 - Optical film layer structure, backlight module, display apparatus and electronic device

Info

Publication number: WO2020181447A1
Application number: PCT/CN2019/077590
Authority: WO
Inventors: 林峰; 田浦延
Original assignee: 深圳阜时科技有限公司
Priority date: 2019-03-11
Filing date: 2019-03-11
Publication date: 2020-09-17
Also published as: CN211123564U

Abstract

Provided in the present application is an optical film layer structure, which is used for condensing backlight light and transmitting detection light and which comprises one or more film layer units. Each film layer unit comprises a first optical surface and a second optical surface arranged opposite to each other. When the light penetrates the film layer unit, the spacing distance between at least one portion of the first optical surface and at least one corresponding portion of the second optical surface through which the same light passes remains unchanged, and at least one portion of the first optical surface is defined as a first light-transmitting part. The propagation direction of at least one portion of the light which penetrates the film layer unit by means of the first light-transmitting part is unchanged.

Description

Optical film layer structure, backlight module, display device and electronic equipment

Technical field

This application belongs to the field of optical technology, and in particular relates to an optical film layer structure, a backlight module, a display device and electronic equipment.

Background technique

Generally speaking, in order to increase the brightness of the backlight, an optical film layer for concentrating the backlight light is usually provided in the liquid crystal display panel, such as: Brightness Enhancement Film (BEF), prism sheet, etc. The optical film layer condenses the scattered backlight light toward the display light emission direction of the liquid crystal display panel by arranging convex microstructures on the light-transmitting substrate. However, although the shape of the existing microstructure has a strong condensing effect on the backlight light, the detection light that is emitted by or reflected by an external object is substantially opposite to the exit direction of the backlight light. It has obvious divergence effect, which is not conducive to detecting the detection light after passing through the optical film layer. Therefore, it cannot meet the current need to set a hidden sensor module under the liquid crystal display panel to realize various under-screen sensing functions. Light path requirements.

Summary of the invention

This application provides an optical film layer, a backlight module, a display device and an electronic device to solve the above technical problems.

The embodiment of the present application provides an optical film structure for condensing backlight light and transmitting detection light. The optical film layer structure includes one or more film layer units. Each film layer unit includes a first optical surface and a second optical surface that are oppositely arranged. The separation distance between at least a portion of the first optical surface and at least a portion of the second optical surface that the same light passes through when the light passes through the film layer unit remains unchanged, and defines the at least a portion of the first optical surface The optical surface is the first transparent portion. The propagation direction of at least a part of the light passing through the film layer unit through the first light-transmitting portion is unchanged.

In some embodiments, the second optical surface includes a flat surface or is a flat surface as a whole, and the first transparent portion and the second optical surface remain parallel.

In some embodiments, the first transparent portion is a flat surface.

In some embodiments, the first optical surface includes at least two first light-transmitting portions, wherein the vertical distance between at least one of the first light-transmitting portions and the opposing second optical surface portion is the same as or different from The other vertical pitch of the first light-transmitting part.

In some embodiments, the first optical surface, ie, the second optical surface, is the boundary surface when light passes through the film layer unit.

In some embodiments, the first optical surface further includes a second light-transmitting portion, and the second light-transmitting portion through which the same light passes when the light passes through the film layer unit and a corresponding part of the second light-transmitting portion The separation distance between the optical surfaces gradually changes, so that the propagation direction of at least a part of the light transmitted therethrough changes and converges in a specific direction.

In some embodiments, the second light transmitting portion is not parallel to the corresponding part of the second optical surface.

In some embodiments, the first optical surface includes a plurality of first light-transmitting parts, and the second light-transmitting parts are connected between each of the first light-transmitting parts.

In some embodiments, the second light-transmitting portion includes an inclined surface, and the inclined surface is inclined to the first light-transmitting portion.

In some embodiments, the inclined surface is connected to the first transparent portion, and the angle between the two is an obtuse angle.

In some embodiments, the second light-transmitting portion includes a plane or a curved surface, and the plane or the curved surface is perpendicular to the first light-transmitting portion.

In some embodiments, the first light-transmitting portion includes a continuously expanding plane area; or

The first light-transmitting portion includes a plurality of planar areas that are not connected to each other; or

The first light-transmitting portion includes a multi-connected area, and a part of the excluded area exists in the multi-connected area.

In some embodiments, each film layer unit includes a substrate and a plurality of microstructures, the substrate includes an upper surface and a lower surface opposite to the upper surface, and the plurality of microstructures are formed on the substrate On the upper surface, the second optical surface is the lower surface of the substrate.

In some embodiments, each microstructure includes a top surface, and the top surface of the microstructure is a side surface facing away from the substrate and parallel to the bottom surface of the substrate. The first light-transmitting The part includes the top surface of the microstructure.

In some embodiments, the top surface of the microstructure includes a plane or the whole is a plane.

In some embodiments, the microstructure further includes a side surface located between the top surface of the microstructure and the upper surface of the substrate, and the second light transmitting portion includes the side surface of the microstructure.

In some embodiments, the side surface is an oblique surface, and the angle between the side surface and the first transparent portion is an obtuse angle.

In some embodiments, the microstructure is a terrace, a cuboid, or a truncated platform.

In some embodiments, the optical film layer structure includes a first film layer unit and a second film layer unit, and the microstructures on the first film layer unit and the second film layer unit are elongated in a specific direction. The strip-shaped protrusions, wherein the first film layer unit and the second film layer unit are sequentially arranged along the light path, and the extension directions of the microstructures of the two are perpendicular to each other.

In some embodiments, the elongated protrusions are elongated rectangular parallelepipeds or elongated ladders, and the elongated protrusions include a top surface facing away from the base and formed by the top surface. The top surface is parallel to the bottom surface of the base, the first transparent portion includes the top surface of the elongated protrusion, and the second transparent portion includes the Long protruding sides.

In some embodiments, the first light-transmitting portion includes a plurality of unconnected planar regions on the microstructure, and the planar regions are parallel to the lower surface of the substrate.

In some embodiments, the microstructure has a double-layered stepped shape, including a first protrusion provided on a substrate and a second protrusion formed on the top surface of the first protrusion, and the first protrusion is an edge An elongated terrace extending in a specific direction, the second protrusion is an elongated triangular prism formed on the top surface of the first protrusion, and the elongated triangular prism is along the same as the elongated terrace The first light-transmitting portion includes two unconnected planar areas on the top surface of the elongated terrace, respectively located on opposite sides of the elongated triangular prism.

In some embodiments, the optical film structure includes a film unit, and the microstructure is a plurality of bumps arranged in an array arranged on the substrate.

In some embodiments, the convex block is a rectangular parallelepiped, a truncated cone or a truncated cone. The convex block includes a top surface facing away from the base and a side surface extending from the periphery of the top surface. The top surface is parallel to the bottom surface of the base, and the first light-transmitting portion includes the side surface of the bump.

In some embodiments, the first light-transmitting portion includes a multi-connected area formed by removing at least a part of the area enclosed by a simple closed curve.

In some embodiments, the microstructure has a double-layer stepped shape, including a first protrusion provided on a substrate and a second protrusion formed on the top surface of the first protrusion. It is a pyramid, a cuboid or a truncated cone, the second protrusion is a pyramid or a cone, and the first light-transmitting portion includes an annular area surrounding the second protrusion on the top surface of the first protrusion.

In some embodiments, the plurality of microstructures have a predetermined interval or are closely arranged without an interval.

In some embodiments, when the plurality of microstructures are arranged at a predetermined interval, the first light transmitting portion further includes a part of the first optical surface located in the interval area.

In some embodiments, the microstructure is a plurality of elongated triangular prisms arranged at predetermined intervals, the first light-transmitting portion includes a part of the first optical surface located in the interval area, and The cross-section of the elongated triangular prism along the vertical edge is an upright triangle, the elongated triangular prism includes a pair of side surfaces inclined to the lower surface of the base, and the second light transmitting portion includes an elongated three A pair of sides of a prism.

In some embodiments, the microstructures are upright triangular prisms or pyramids, the microstructures are arranged at a predetermined interval, and the first light-transmitting portion includes a portion located in the interval area The first optical surface, the second light-transmitting portion includes the side surface of the triangular prism or the triangular pyramid.

In some embodiments, the microstructure and the substrate are made of the same or different materials.

In some embodiments, when the material of the microstructure is different from that of the substrate, the refractive index of the material of the microstructure is the same or similar to that of the substrate, so that the light is passing through the substrate. The interface between the microstructure and the substrate is approximately straight.

In some embodiments, the second optical surface of the film layer unit is provided with a light diffusion layer for diffusing light.

Embodiments of the present application provide a backlight module for providing backlight light to a display panel and transmitting detection light emitted and/or reflected by an external object to a sensor module. The detection light is used to detect or identify the biological feature information of the external object. The backlight module includes the optical film structure as described in the above embodiment.

In some embodiments, a diffusion sheet is further included to diffuse the backlight light. The optical film layer structure and the diffusion sheet are sequentially arranged along the optical path, and the diffusion sheet is made by forming a ground glass-like rough microstructure on the substrate; or

The diffusion sheet is made by incorporating diffusion particles on the substrate; or

The diffusion sheet is a membrane layer with a nanoporous structure, and a plurality of nano-level pores are formed in the membrane layer; or

The diffusion sheet is a quantum dot film layer arranged on the light exit surface of the light guide plate, and the quantum dot film layer contains quantum dot material, and the quantum dot material absorbs blue backlight light and converts it into green backlight light and The backlight module further includes a backlight light source for providing backlight light, and the backlight light source is a blue luminous light source.

In some embodiments, the diffusion particles are made of materials that transmit infrared or near-infrared light and reflect visible light.

In some embodiments, the average size of the diffusion particles is in the range of 380 nanometers to 780 nanometers.

In some embodiments, the diffusion sheet has a greater diffusion effect on the backlight light than on the detection light.

In some embodiments, it further includes:

The light guide plate includes a light emitting surface and a bottom surface opposite to the light emitting surface;

The reflective sheet is arranged on one side of the bottom surface and used to reflect the backlight light transmitted from the bottom surface of the light guide plate, wherein the reflective sheet is made of a material that transmits infrared or near-infrared light and reflects visible light.

In some embodiments, the backlight module is used to provide visible light and can transmit infrared light or near-infrared light.

The embodiment of the present application provides a display device, which includes a display panel and a backlight module. The display panel is used for displaying pictures. The backlight module is used to provide backlight light to the display panel. Wherein, the backlight module is the backlight module according to any one of claims 33-39.

In some embodiments, the display panel is a liquid crystal display panel.

The embodiments of the present application provide an electronic device, which includes the display device described in the foregoing embodiments and a sensor module at least partially disposed under the display device. The sensing module receives the detection light reflected or/and emitted from an external object through the display device to perform corresponding sensing.

In some embodiments, the sensing module includes a receiving unit, which is arranged under the backlight module and receives the detection light through the display panel and the backlight module to perform Corresponding sensing.

In some embodiments, the sensing module further includes a transmitting unit for transmitting the detection light to the external object, and the receiving unit is arranged below the backlight module, or is arranged It is located in the non-display area beside the display device.

In some embodiments, the sensor module is used to perform one or more of fingerprint sensing, three-dimensional face sensing, and living body sensing.

The optical film structure, backlight module, display device and electronic equipment provided by the embodiments of the present application are provided on a light-transmissive substrate with a microstructure shape that can not change the direction of the transmitted detection light, so as to facilitate the display without affecting the display. Under the premise of the effect, the transmitted detection light is sensed under the screen, which can further increase the screen-to-body ratio of the electronic device and enhance the visual experience of the electronic device.

The additional aspects and advantages of the embodiments of the present application will be partly given in the following description, and part of them will become obvious from the following description, or be understood through the practice of the embodiments of the present application.

Description of the drawings

FIG. 1 is a schematic front view of an electronic device provided by the first embodiment of the present application.

FIG. 2 is a schematic diagram of the structure of the electronic device in FIG. 1.

Fig. 3 is a schematic structural diagram of the sensor module in Fig. 2 integrating a memory and a processor.

4 is a schematic diagram of the internal structure of the electronic device provided by the second embodiment of the present application.

Fig. 5 is a schematic front view of the electronic device in Fig. 4.

FIG. 6 is a schematic structural diagram of a display device provided by the third embodiment of the present application.

FIG. 7 is a schematic structural diagram of a backlight module provided by a fourth embodiment of the present application.

FIG. 8 is a schematic structural diagram of a backlight module provided by a fifth embodiment of the present application.

FIG. 9 is a schematic structural diagram of a backlight module provided by a sixth embodiment of the present application.

FIG. 10 is a schematic structural diagram of a backlight module provided by a seventh embodiment of the present application.

FIG. 11 is a schematic structural diagram of a backlight module provided by an eighth embodiment of the present application.

FIG. 12 is a schematic structural diagram of an optical film layer structure provided by a ninth embodiment of the present application.

FIG. 13 is a light path diagram when light passes through the first light transmitting portion and the second light transmitting portion in FIG. 12.

FIG. 14 is a schematic structural diagram of an optical film layer structure provided by a tenth embodiment of the present application.

15 is a schematic structural diagram of an optical film layer structure provided by an eleventh embodiment of the present application.

FIG. 16 is a schematic structural diagram of an optical film layer structure provided by a twelfth embodiment of the present application.

FIG. 17 is a schematic structural diagram of an optical film layer structure provided by a thirteenth embodiment of the present application.

FIG. 18 is a schematic structural diagram of an optical film layer structure provided by the fourteenth embodiment of the present application.

FIG. 19 is a schematic structural diagram of an optical film layer structure provided by the fifteenth embodiment of the present application.

FIG. 20 is a schematic structural diagram of an optical film layer structure provided by the sixteenth embodiment of the present application.

FIG. 21 is a schematic structural diagram of an optical film layer structure provided by the seventeenth embodiment of the present application.

FIG. 22 is a schematic structural diagram of an optical film layer structure provided by the eighteenth embodiment of the present application.

FIG. 23 is a schematic structural diagram of an optical film layer structure provided by the nineteenth embodiment of the present application.

FIG. 24 is a schematic structural diagram of an optical film layer structure provided by the twentieth embodiment of the present application.

FIG. 25 is a schematic structural diagram of an optical film layer structure provided by the twenty-first embodiment of the present application.

detailed description

The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The following embodiments described with reference to the accompanying drawings are exemplary, and are only used to explain the present application, and cannot be understood as a limitation to the present application. In the description of this application, it should be understood that the terms "first" and "second" are only used for description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number or arrangement of the indicated technical features order. Therefore, the technical features defined with "first" and "second" may explicitly or implicitly include one or more of the technical features. In the description of this application, "multiple" means two or more than two, unless otherwise specifically defined.

In the description of this application, it should be noted that the terms "installed", "connected", and "connected" should be understood in a broad sense, unless explicitly specified or limited otherwise. For example, they can be fixed or detachable. Connection, or integral connection; it can be mechanical connection, it can be electrical connection or mutual communication; it can be direct connection or indirect connection through an intermediate medium, it can be the internal communication of two components or the mutual communication between two components Role relationship. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

The following disclosure provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, only the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the application. In addition, this application may reuse reference numerals and/or reference letters in different examples. This repeated use is for simplifying and clearly expressing the application, and does not indicate the various embodiments and/or settings discussed. The specific relationship between. In addition, the various specific processes and materials provided in the following description of this application are only examples for realizing the technical solutions of this application, but those of ordinary skill in the art should be aware that the technical solutions of this application can also be implemented by other methods not described below. Process and/or other materials.

Further, the described features and structures can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided in order to fully understand the embodiments of the present application. However, those skilled in the art should realize that even without one or more of the specific details, or adopting other structures, components, etc., the technical solutions of the present application can be practiced. In other cases, well-known structures or operations are not shown or described in detail to avoid obscuring the focus of this application.

As shown in FIGS. 1 and 2, the first embodiment of the present application provides an electronic device 1, such as a mobile phone, a notebook computer, a tablet computer, an e-book, a personal digital assistant, a touch interactive terminal device, and the like. The electronic device 1 includes a memory 12, a processor 14, a display device 3, and a sensor module 10 at least partially arranged on the back of the display device 3.

The display device 3 includes a display panel 30 and a backlight module 4 that provides backlight light for the display panel 30. The sensor module 10 is at least partially located below the backlight module 4 and directly faces the display area.

In this embodiment, the display panel 30 is, for example, a liquid crystal display panel. However, alternatively, the display panel 30 may also be another suitable type of display panel, such as an electronic paper display panel. The sensor module 10 is used to implement the corresponding under-screen sensing function through the display device 3. The sensing function includes, but is not limited to, two-dimensional and/or three-dimensional image sensing, three-dimensional modeling, distance sensing, fingerprint recognition sensing, living body sensing, and the like. The detection light needs to pass through each layer structure of the display device 3 to realize the interaction between the external object and the sensor module 10.

The memory 12 is used to store data generated by the sensing module 10 during the sensing process, sensing-related programs, and data required for implementing sensing-related functions, such as: according to the sensed external object Characteristic information The legal user's identity characteristic information needed for identity recognition. The processor 14 can be used to execute programs related to sensing. The electronic device 1 can correspondingly execute related functions according to the sensing result of the sensing module 10, such as turning off the screen, unlocking the screen, paying, logging in to an account, entering the next level menu, and opening permissions.

In this embodiment, the memory 12 and the processor 14 are components provided in the electronic device 1 independently of the sensor module 10. However, variably, in some embodiments, the memory 12 or the processor 14 may also be an internal component of the sensor module 10.

In this embodiment, the sensor module 10 includes a receiving unit 103. The receiving unit 103 is located below the backlight module 4. The detection light emitted or/and reflected by the external object is received by the receiving unit 103 after passing through the display panel 30 and the backlight module 4. The sensing module 10 realizes corresponding sensing of the external object according to the received detection light. Wherein, the external object is, for example, but not limited to, the user's finger, the user's face, or other suitable parts.

Specifically, the receiving unit 103 includes a light modulator 104 and a sensor 106 located under the light modulator 104. The light modulator 104 is used to collect and regularize the detection light passing through the display device 3 to facilitate the sensing of the detection light. The detection light is received by the sensor 106 after passing through the light modulator 104. The sensor 106 obtains relevant information of the external object according to the detected light, for example, so as to realize corresponding sensing. The related information of the external object includes, but is not limited to, the image, location, and biological characteristics of the external object. In this embodiment, the light modulator 104 is a beam collimating element such as a focus lens. The sensor 106 is an image sensor. However, in some embodiments, the light modulator 104 may also be omitted or replaced with other optical elements. The sensor 106 may also be other types of sensors.

In this embodiment, the sensor module 10 may further include a transmitting unit 102. The emission unit 102 emits detection light to the external object through the backlight module 4 and the display panel 30.

Specifically, the emitting unit 102 includes a sensing light source. The detection light emitted by the sensing light source passes through the display device 3 and then is reflected by an external object to be turned back. After passing through the display device 3 again, it is received by the receiving unit 103 so as to sense relevant information of the external object, such as sensing Biometric data of external objects for identification, etc.

The detection light may have a specific wavelength according to the sensing principle and application scenarios. In this embodiment, the detection light can be used, but is not limited to, to sense a three-dimensional image of a fingerprint or a human face. It can be infrared or near-infrared light, and the wavelength range is 800 nm to 1650 nm. Alternatively, in other embodiments, the detection light may also be other suitable detection signals, such as ultraviolet light, ultrasonic waves, electromagnetic waves, and so on.

It can be understood that, in other embodiments, as shown in FIG. 3, the sensor module 10 may also integrate a corresponding memory 12 and a processor 14 to process the acquired sensing signal and output the sensing The result is directly used by the electronic device 1.

As shown in FIG. 4, the second embodiment of the present application provides an electronic device 2, which is basically the same as the electronic device 1 provided in the first embodiment. The main difference is that: the transmitting unit 202 of the sensor module 20 is parallel Not arranged on the back of the display device 3, but arranged outside the display area of the display device 3, such as but not limited to being arranged beside the display panel 30 or beside the backlight module 4 , Or other suitable locations of the electronic device 1, etc. The detection light emitted by the emitting unit 202 does not need to pass through the display device 3 before being projected on an external object, which can be applied to scenarios where the emitting power of the emitting unit 202 is high, for example, the emitting unit 202 requires Projecting a light spot with a preset pattern on an external object realizes three-dimensional surface sensing. Other components of the sensor module 20, such as the light modulator 204, the sensor 206, the memory 22, the processor 24, etc., can still be arranged on the back of the display device 3 to reduce the occupation of the display area and improve the electronic equipment 2 screen-to-body ratio.

It is understandable that the light modulator 204 and the sensor 206 of the sensor module 20 can be arranged below any position in the display area of the display device 7, which is not limited in this application.

Further, it can be understood that, as shown in FIG. 5, the memory 22 and the processor 24 may also be disposed in other positions inside the electronic device 2 independently of the sensor module 20.

As shown in FIG. 6, the third embodiment of the present application provides a display device 3 that can be used in the aforementioned electronic device 1. The display device 3 includes a display panel 30 and a backlight module 4. In this application, the display panel 30 is a liquid crystal display panel as an example for description.

The display panel 30 includes, but is not limited to, a first substrate (not shown), a thin film transistor array circuit (not shown) provided on the first substrate, a second substrate (not shown), a first substrate and The liquid crystal layer (not shown), upper polarizer (not shown), lower polarizer (not shown), color filter (not shown) and protective cover (not shown) between the second substrate Wait. The backlight module 4 provides a backlight beam for the display panel 30. The display panel 30 is arranged on the light emitting side of the backlight module 4 to modulate the transmitted backlight according to the content to be displayed to realize display.

As shown in FIG. 7, the fourth embodiment of the present application provides a backlight module 4 that can be used in the above-mentioned display device 3. The backlight module 4 can be used to gather the backlight light emitted to the display panel 30 and transmit the detected light reflected by an external object or emitted by the external object itself, so as to simultaneously provide backlight and under-screen for the display panel 30 Set the requirements of the sensor module 10. The backlight module 4 includes a backlight source 40, a light guide plate 42, a reflection sheet 44, a diffusion sheet 46, and an optical film structure 5.

The light guide plate 42 includes a light-emitting surface 420, a bottom surface 422 opposite to the light-emitting surface 420, and a light-incident surface 424 located on one side of the light-emitting surface 420 and the bottom surface 422. The backlight light source 40 is arranged corresponding to the light incident surface 424 and is used for emitting backlight light into the light guide plate 42. The backlight light is mixed in the light guide plate 42 and then emitted from the light emitting surface 420. The reflective sheet 44 is disposed on the bottom surface 422 of the light guide plate 42 and is used to reflect the backlight light back into the light guide plate 42 to improve the utilization rate of the backlight light. The reflective sheet 44 is made of a material that can transmit infrared or near-infrared light and reflect visible light, so that the backlight light in the wavelength range of visible light can be reflected back to the light guide plate 42, and at the same time can pass infrared or near-infrared detection Light.

The optical film structure 5 is arranged on the light-exit surface 420 side of the light guide plate 42 to gather the backlight light emitted from the light guide plate 42 to improve the backlight brightness provided by the backlight module 4. The optical film layer structure 5 includes one or more film layer units 50. In this embodiment, the optical film layer structure 5 includes two film layer units 50, which are a first film layer unit 501 and a second film layer unit 502, respectively. The structure of the first film layer unit 501 and the second film layer unit 502 are similar. In the following, the first film layer unit 501 is taken as an example for description.

The first film layer unit 501 includes a first optical surface 503 and a second optical surface 504 disposed oppositely. The first optical surface 503 and the second optical surface 504 are boundary surfaces when the backlight light and the detection light pass through the first film layer unit 501. That is, the backlight light and the detection light enter the first film layer unit 501 from one of the first optical surface 503 and the second optical surface 504, and exit the other one out of the first film layer unit 501 . The first optical surface 503 is arranged close to the side of the entire backlight module 4 where the backlight light is emitted. The second optical surface 504 is located close to the light-emitting surface 420 of the light guide plate 42. When the backlight light passes through the first film layer unit 501, it enters the second optical surface 504 and then passes through the first optical surface 503. When the returned detection light passes through the first film layer unit 501, it enters the first optical surface 503 and then passes through the second optical surface 504. When the backlight light and the detection light pass through the first film layer unit 501, the distance between at least a part of the first optical surface 503 and at least a corresponding second optical surface 504 through which the same backlight light or the detection light passes is maintained. No change, that is, maintain a roughly parallel relationship with each other. The at least a part of the first optical surface 503 is defined as the first light-transmitting portion 520, and the propagation direction of the detected light is basically unchanged through the first light-transmitting portion 520 to pass through at least a part of the first film unit 501. The position shifts, so that the sensor module 10 (see FIG. 2) disposed under the screen can sense this part of the detected light.

The first optical surface 503 further includes a second light transmitting portion 522 for collecting light. The second light-transmitting portion 522 and the corresponding part of the second optical surface 504 through which the same backlight light or detection light passes are not parallel, so that the propagation direction of the backlight light or detection light passing therethrough is obvious. Deflection, which can be used to gather light in a preset direction.

The stacking method of the light guide plate 42, the diffusion sheet 46, and the optical film structure 5 is defined as a vertical direction, the first optical surface 503 includes at least one first plane 5030 perpendicular to the vertical direction, and the second optical The surface 504 includes a second plane 5040 perpendicular to the vertical direction. Therefore, the first plane 5030 and the second plane 5040 are parallel to each other, and the first plane 5030 can serve as the first light-transmitting portion 520. The first plane 5030 may be directly opposite to the second plane 5040, or may be slightly offset and opposite to the second plane 5040. The second light-transmitting portion 522 includes an inclined surface 5220 that is inclined between the first light-transmitting portion 520 and the second optical surface 504, and the backlight light incident on the first film layer unit 501 When exiting from the inclined surface 5220, convergence occurs. The inclined surface 5220 is connected to the first plane 5030, and the angle between the two is an obtuse angle.

Optionally, the first film layer unit 501 includes a substrate 500 and a microstructure 52 disposed on the substrate 500. The microstructure 52 is used to adjust the light path of the light. The material of the substrate 500 and the microstructure 52 may be different or the same. When the material of the substrate 500 and the microstructure 52 are different, the refractive index of the material of the substrate 500 and the microstructure 52 is similar. Therefore, when the detection light passes through the interface between the substrate 500 and the microstructure 52, the refraction is relatively small, and its influence on the propagation direction of the light can be ignored and regarded as an approximately straight line propagation.

The upper and lower surfaces of the substrate 500 are planes parallel to each other. The microstructure 52 is formed on the upper surface of the substrate 500. The microstructure 52 is, for example, but not limited to, a terrace-like structure. The terrace-like structure includes a top surface facing away from the upper surface of the base 500. The top surface of the terrace-like structure is parallel to the upper and lower surfaces of the base 500. The top surface of the terrace-like structure is the first plane of the first optical surface 503, that is, the first light transmitting portion 520. When some detected light rays pass through the top surface of the microstructure 52 to the bottom surface of the substrate 500, the position of the light rays mainly shifts, while the propagation direction of the light rays is basically unchanged. The side surface of the terrace-like structure extends obliquely from the periphery of the top surface. Because the side surface of the terrace-like structure is not parallel to the upper and lower surfaces of the base 500, the propagation direction of the backlight light will be significantly deflected when passing through the side surface, and it can be used as a second light transmitting part that gathers the backlight light in a specific direction 522. The microstructures 52 on the substrate 500 are parallel elongated protrusions extending in the same direction, and the microstructures 52 are closely arranged with no space between them.

In this embodiment, other surfaces of each microstructure 52 except for the bottom surface contacting the substrate 500 can transmit light, so as to serve as the first optical surface 503 of the first film layer unit 501. The lower surface of the substrate 500 is the second optical surface 504 of the first film layer unit 501.

However, alternatively, in some embodiments, as shown in FIG. 18, the microstructures 52 may also be arranged at intervals. Correspondingly, the first optical surface 503 also includes a film surface located in the spaced area of the microstructure 52, where the film surface may be on the substrate 500 that is not covered by the material of the microstructure 52 The exposed upper surface of the substrate 500 may be the outer surface of the material layer of the microstructure 52 covering the interval area. The surface of the film layer in the spacer area is a plane parallel to the second optical surface 504, which can be used as one of the first planes 5030 of the first optical surface 503, where the first plane 5030 is the same as the above The first plane 5030 on the top surface of the microstructure 52 has different vertical distances to the second plane 5040 respectively.

The extension direction of the microstructure 52 on the second film layer unit 502 is perpendicular to the extension direction of the microstructure 52 on the first film layer unit 501. The first film layer unit 501 and the second film layer unit 502 are arranged up and down, so that when a part of the detection light passes through the first film layer unit 501 and the second film layer unit 502, the light mainly occurs. The direction of propagation is basically unchanged, which is beneficial for the sensor module 10 arranged under the screen to obtain more accurate sensing information. Taking imaging as an example, the image of the external object obtained by the sensor module 10 based on this part of the detected light is more accurate.

Alternatively, in some embodiments, as shown in FIG. 10, the optical film layer structure 5 may also be a single-layer film structure, and only includes a single-piece film unit 50.

Regarding the optical film layer structure 5, a number of embodiments will be described later in this application.

The diffusion sheet 46 is arranged on one side of the light exit surface 420 of the light guide plate 42 and is used to diffuse the backlight light to achieve an atomization effect.

The diffusion sheet 46 diffuses the backlight light in the visible light wavelength range and transmits infrared or near-infrared detection light. For example, the wavelength range of the backlight light is 380 nm to 760 nm. The wavelength range of the detection light is 800 nm to 1650 nm. The diffusion effect of the diffusion sheet 46 on the light can be measured by haze. The haze refers to the percentage of the light intensity of the transmitted light that deviates from the incident direction by more than 2.5 degrees after passing through the diffuser 46 to the light intensity of the original incident light. The greater the haze of the light after passing through the diffusion sheet 46, the stronger the diffusion effect of the diffusion sheet 46 on the light. If the haze exceeds 30%, it is considered that the diffusion sheet 46 has a diffusion effect on the light. Therefore, in this embodiment, the haze of the diffuser 46 to the passing detection light is less than 30%.

The diffusion sheet 46 can realize the diffusion of light by forming a light diffusion structure on the substrate. In this embodiment, the light diffusion structure may be a ground glass-like rough microstructure. The substrate is a light-transmitting material, which can be selected from any one or more of polycarbonate (PC), polymethyl methacrylate (PMMA), and polyethylene terephthalate (PET) Combinations, or other materials that meet the above requirements for light transmission. The average size of the ground glass-like rough microstructure is in the visible light wavelength range from 380 nanometers (nm) to 760 nm, so that it can have a more obvious diffusion effect on the backlight light belonging to the visible light, and it has a longer wavelength infrared or near Infrared detection light has strong penetrability.

Alternatively, in other embodiments, the diffusion sheet 46 can be made by incorporating diffusion particles on a substrate. When the backlight light passes through the diffusion sheet 46, it continuously passes between the diffusion particles with different refractive indexes and the transparent material substrate, and occurs multiple refraction, reflection and scattering phenomena, thereby achieving the effect of optical diffusion. The diffusion particles may be made of materials that transmit infrared or near-infrared light and reflect visible light. The average size of the diffusion particles is in the visible light wavelength range from 380 nanometers (nm) to 760 nm, so that it can have a more obvious diffusion effect on the backlight light belonging to the visible light and detect the infrared or near-infrared light with longer wavelength It has strong penetrability.

Alternatively, in other embodiments, the diffusion sheet 46 is a membrane layer with a nanoporous structure. The material of the nanoporous membrane layer may be, but is not limited to, a polyethylene fabric (Nanoporous Polythylene Textile). The polyethylene fabric material is formed with a plurality of nano-sized pores, and the pores have a size range of 100 nm to 1000 nm, so that they can transmit infrared or near-infrared light but can scatter visible light.

The diffusion sheet 46 may include an upper diffusion sheet 461 and a lower diffusion sheet 462. The upper diffusion sheet 461 and the lower diffusion sheet 462 have a similar structure, and both can be used to diffuse the backlight light and transmit the detection light reflected by the external object. The upper diffuser 461 and the lower diffuser 462 have their own functional deviations. For example, the upper diffuser 461 emphasizes the fogging effect of the backlight light, while the lower diffuser 462 has a relatively high transmittance of the backlight light. . Between the upper diffusion sheet 461, the lower diffusion sheet 462, the first film layer unit 501 and the second film layer unit 502, and between the upper diffusion sheet 461, the lower diffusion sheet 462 and the single film layer unit 50 There is no specific restriction on the arrangement order. For example, in this embodiment, the first film layer unit 501 and the second film layer unit 502 are disposed between the upper diffusion sheet 461 and the lower diffusion sheet 462.

As shown in FIG. 8, the fifth embodiment of the present application provides a backlight module 4 that can be used in the above-mentioned display device 3, which is basically the same as the backlight module 4 provided in the fourth embodiment, with the main difference being: The upper diffusion sheet 461 may be disposed between the first film layer unit 501 and the second film layer unit 502. The lower diffusion sheet 462 is disposed between the second film layer unit 502 and the light guide plate 42.

The upper diffusion sheet 461 and/or the lower diffusion sheet 462 may be formed by the light diffusion layer 505 formed on the second optical surface 504 of the first film layer unit 501, the second film layer unit 502 or the single film layer unit 50. (See Figure 9) instead. For example, as shown in FIGS. 8 and 9, the sixth embodiment of the present application provides a backlight module 4 that can be used in the above-mentioned display device 3, which is basically the same as the backlight module 4 provided in the fourth embodiment, and mainly The difference is that the light diffusion layer 505 is formed on the second optical surface 504 of the first film layer unit 501 instead of the upper diffusion sheet 461.

As shown in FIG. 10, the seventh embodiment of the present application provides a backlight module 4 that can be used in the above-mentioned display device 3, which is basically the same as the backlight module 4 provided in the fourth embodiment, and the main difference lies in: The lower diffusion sheet 462 (see FIG. 8) is replaced by a light diffusion layer 505 formed on the second optical surface 504 of the single-piece film layer unit 50. The upper diffusion sheet 461 is arranged on the light exit side of the single film layer unit 50.

Alternatively, as shown in FIG. 11, the eighth embodiment of the present application provides a backlight module 4 that can be used in the above-mentioned display device 3, which is basically the same as the backlight module 4 provided in the fourth embodiment, with the main differences It is: the lower diffusion 462 pieces can be replaced with a quantum dot film layer. The diffusion effect of the quantum dot film 462 on the backlight light is greater than the diffusion effect on infrared light or near-infrared light. The quantum dot film layer 462 contains a quantum dot material 463. The quantum dot material 463 can absorb blue backlight light and convert it into green backlight light and red backlight light respectively. Therefore, the backlight source 40 only needs to be a blue light source, and the emitted blue backlight light is partially absorbed by the quantum dot material 463 in the quantum dot film 462 and converted into green backlight light and red backlight light. , And then mixed with the unabsorbed part of the blue backlight light to form a white backlight light and exit. Since the quantum dot material 463 emits the converted light from itself as the center during the conversion of light emission, and also has a scattering effect, the white backlight light converted by the quantum dot film 462 also has good diffusibility . The quantum dot material does not absorb light in the infrared or near-infrared wavelength range, so it can transmit the detection light.

It can be understood that, in the above embodiment, the light diffusion layer 505 formed on the second optical surface 504 on the first film layer unit 501 may be omitted. In addition, when the optical film layer structure 5 is a single-layer film structure, the light diffusion layer 505 on the second optical surface 504 can also be omitted.

As shown in FIG. 12, the ninth embodiment of the present application provides an optical film layer structure 5 that can be used in the aforementioned backlight module 4. The optical film structure 5 is used to gather the backlight light and at least part of the detection light passes through the detection light. The propagation direction of the detection light is basically unchanged and the position is shifted, so as to simultaneously increase the display brightness and set the sensor under the screen. Module 10 performs sensing requirements.

The optical film layer structure 5 includes a first film layer unit 501 and a second film layer unit 502. The structures of the first film layer unit 501 and the second film layer unit 502 are similar, and the first film layer unit 501 is now taken as an example for description.

The first film layer unit 501 includes a first optical surface 503 and a second optical surface 504 opposite to each other. The first optical surface 503 and the second optical surface 504 are boundary surfaces when the backlight light and the detection light pass through the first film layer unit 501. That is, the backlight light and the detection light enter the first film layer unit 501 from one of the first optical surface 503 and the second optical surface 504, and exit the other one out of the first film layer unit 501 . The first optical surface 503 is arranged close to the side of the entire backlight module 4 (see FIG. 7) where the backlight light is emitted. The second optical surface 504 is arranged close to the light-emitting surface 420 (see FIG. 7) of the light guide plate 42. When the backlight light passes through the first film layer unit 501, it enters the second optical surface 504 and then passes through the first optical surface 503. When the returned detection light passes through the first film layer unit 501, it enters the first optical surface 503 and then passes through the second optical surface 504.

When the backlight light and the detection light pass through the first film layer unit 501, the distance between at least a part of the first optical surface 503 and at least a corresponding second optical surface 504 through which the same backlight light or the detection light passes is maintained. No change, that is, maintain a roughly parallel relationship with each other. The at least a part of the first optical surface 503 is defined as the first light-transmitting portion 520.

As shown in FIG. 13, since the first light-transmitting portion 520 of the first optical surface and the corresponding part of the second optical surface 504 through which the same light rays pass are maintained in a substantially parallel relationship, according to the law of light refraction, The propagation direction of the detected light rays passing through at least a part of the first film layer unit 501 through the first light-transmitting portion 520 is basically unchanged, but the position is shifted D. Referring to the label in FIG. 13, the part before the detection light enters from the first transparent portion 520 is O1, and the part after the same detection light exits from the corresponding second optical surface 504 is O2. It can be seen that the O2 part after the detection light is emitted is mainly shifted by D compared to the O1 part before the incident light, and the transmission direction is unchanged.

It can be understood that, due to manufacturing tolerances or processing accuracy, the parallel relationship between the first transparent portion 520 and the corresponding portion of the second optical surface 504 may have a reasonable deviation range.

According to the law of light refraction, because the second light-transmitting portion 522 of the first optical surface 503 is not parallel to the corresponding part of the second optical surface 504, the second light-transmitting portion 522 transmits through the The backlight light of the optical film structure 5 will be deflected in a more obvious direction, which can be used to gather the backlight light in a preset direction to improve the brightness of the backlight.

Specifically, the first film layer unit 501 includes a substrate 500 and a plurality of microstructures 52 formed on the substrate 500 for adjusting light. The substrate 500 includes an upper surface 508 and a lower surface 509 arranged in parallel with the upper surface 508. The plurality of microstructures 52 are formed on the upper surface 508 of the substrate 500. The second optical surface 504 is the lower surface 509 of the substrate 500. The first optical surface 503 includes a part of the outer surface of the microstructure 52 that is not in contact with the upper surface 508 of the substrate 500. If there is an interval between the microstructures 52, the first optical surface 503 may also include a part of the upper surface 508 of the substrate 500 where the microstructures 52 are not formed. It is understandable that if the microstructure 52 is made by coating material on the substrate and then using a molding process, the material of the microstructure 52 in the space between the microstructures 52 is not completely removed during molding. Here, the upper surface 508 of the substrate 500 is not exposed. In a strict sense, the first optical surface 503 should include the outer surface of the microstructure material layer covering the spacer area, instead of the upper surface of the substrate 500. 508 is located in the part of the compartment.

In this embodiment, the microstructure 52 is a rectangular parallelepiped structure, and includes a top surface 521 and a side surface 523 extending from the periphery of the top surface 521, and the side surface 523 is perpendicular to the top surface 521. The top surface 521 of the microstructure 52 is a side surface facing away from the substrate 500. The top surface 521 of the microstructure 52 is parallel to the bottom surface 508 of the substrate 500. Correspondingly, the side surface 523 of the microstructure 52 is perpendicular to the lower surface 508 of the substrate 500. The top surface 521 is rectangular, which is a continuously expanding plane area. The microstructures 52 are arranged at intervals. Because the top surface 521 of the microstructure 52 is parallel to the bottom surface 509 of the substrate 500 as the second optical surface 504, the first light-transmitting portion 520 includes the top surface 521 of the microstructure 52 and the adjacent microstructure 52. Part of the first optical surface 503 within the interval area. In addition, the side surface 523 of the microstructure 52 is not parallel to the lower surface 509 of the substrate 500 as the second optical surface 504, so the second light-transmitting portion includes the side surface 523 of the microstructure 52. After at least part of the detection light passes through the first film unit 501 through the first light-transmitting portion 520, its propagation direction is basically unchanged, and the position of the light is shifted, so that the transmitted detection light is easier and more accurate. Be sensed. The propagation direction of the backlight light transmitted through the second light transmitting portion 522 is deflected so as to be converged in a specific direction.

In addition, since the plurality of microstructures 52 are arranged at intervals, a part of the first optical surface 503 located in the interval area may also serve as the first light-transmitting portion 520, for example: the substrate 500 is not The part covered by the microstructure 52 may be the outer surface of the material layer of the microstructure 52 covering the interval area. Therefore, the area of the first light-transmitting part 520 is increased, so that the transmission direction of more detection light does not change after passing through the first film layer unit 501, thereby increasing the detection light that can be better sensed. The luminous flux improves the accuracy of the acquired sensing data.

The plurality of cuboid microstructures 52 on the first film layer unit 501 extend on the upper surface 508 of the substrate 500 along a predetermined direction to form a plurality of parallel long cuboids. Similarly, the shape of the microstructure 52 on the second film layer unit 502 is the same as the shape of the microstructure 52 on the first film layer unit 501, but the extension direction of the cuboid microstructure 52 on the second film layer unit 502 It is perpendicular to the extension direction of the cuboid microstructure 52 on the first film layer unit 501.

However, alternatively, in addition to the rectangular parallelepiped structure, the microstructure 52 may also be another suitable raised structure, and the top surface of the raised structure may include a surface portion substantially parallel to the lower surface of the substrate. .

The substrate 500 is made of a light-transmitting material, and can transmit back light in the visible wavelength range and detection light in the infrared or near-infrared wavelength range. The material of the substrate 500 may be selected from any one or a combination of polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), or Other materials that meet the above requirements for light transmission.

The microstructure 52 may be an integral structure with the substrate 500 and formed directly on the substrate 500 using a molding process. Alternatively, the microstructure 52 may also be an independent part different from the substrate 500. For example, a curable material is first coated on the substrate 500, and the curable material is formed into a specific shape of the microstructure 52 by a molding process, and finally the microstructure 52 is cured. It is understandable that a curable material with a refractive index substantially the same as that of the substrate 500 is selected to form the microstructure 52, so that the refraction of light when passing through the interface between the microstructure 52 and the substrate 500 is relatively low. Small, the effect on the direction of light propagation can be ignored and regarded as approximately straight line propagation.

Alternatively, the microstructure 52 and the substrate 500 may also be two independent film layers bonded together by an adhesive. The adhesive may include, but is not limited to, a pressure sensitive adhesive or an ultraviolet curable adhesive.

As shown in FIG. 14, the tenth embodiment of the present application provides an optical film structure 5 that can be used in the foregoing backlight module 4, which is basically the same as the optical film structure 5 provided in the ninth embodiment, with the main difference being : In the ninth embodiment, the second optical surface 504 of the first film layer unit 501 is a flat surface. Optionally, in this embodiment, the second optical surface 504 of the first film layer unit 501 may also be provided with a light diffusion layer 505 for diffusing light to replace the diffusion sheet 46 (see Figure 7). The light diffusion layer 505 is a layer of ground glass-like rough textures to diffuse incident backlight light. It is understandable that the light diffusion layer 505 may be directly formed on the second optical surface 504, or a coating layer may be laid on the second optical surface 504 and then the coating layer may be formed into ground glass-like rough textures. The material of the light diffusion layer 505 may be different from that of the substrate 500 of the first film layer unit 501, and is a material that can transmit infrared or near-infrared light and reflect visible light. The rough texture, for example, may be a plurality of small protrusions. The average size of the small protrusions can be in the visible light wavelength range from 380 nanometers (nm) to 760 nm, so that it can have a more obvious scattering effect on visible light and a longer wavelength infrared or near-infrared detection light. Strong penetration.

As shown in FIG. 15, the eleventh embodiment of the present application provides an optical film structure 5 that can be used in the aforementioned backlight module 4, which is basically the same as the optical film structure 5 provided in the tenth embodiment, with the main differences In order to reduce the scattering of detection light reflected by an external object when passing through the light diffusion layer 505 of the first film layer unit 501, the light diffusion layer 505 corresponds to the detection light that needs to pass through the reflected detection light. A sensing portion 506 having a flat surface is formed at the position. The sensing part 506 is arranged corresponding to the position of the sensing module 10 (see FIG. 3) located below the backlight module 4 (see FIG. 3). It is understandable that, in other embodiments, the sensing portion 506 may also be a plurality of light-transmitting holes penetrating through the light diffusion layer 505, so that partially reflected detection light does not occur when passing through the light-transmitting hole. Diffusion to facilitate subsequent sensing.

As shown in FIG. 16, the twelfth embodiment of the present application provides an optical film structure 5 that can be used in the aforementioned backlight module 4, which is basically the same as the optical film structure 5 provided in the tenth embodiment, with the main differences The light diffusion layer 505 can also be a coating formed on the second optical surface 504 of the first film layer unit 501, and a plurality of diffusers for diffusing light are incorporated in the coating. Particles 507. It can be understood that the diffusion particles 507 may be made of materials that can transmit infrared or near-infrared light and reflect visible light. The average size of the diffusion particles 507 is in the visible light wavelength range from 380 nanometers (nm) to 760 nm, so that it can have a more obvious scattering effect on visible light and has a stronger effect on infrared or near-infrared detection light with longer wavelengths. Of penetrability.

As shown in FIG. 17, the thirteenth embodiment of the present application provides an optical film structure 6 that can be used in the aforementioned backlight module 4, which is basically the same as the optical film structure 5 provided in the ninth embodiment, with the main differences It is that the microstructures 62 on the first film layer unit 601 and the second film layer unit 602 are elongated terraced structures.

Specifically, the elongated terrace-shaped microstructure 62 includes a top surface 621 and a side surface 623. The top surface 621 faces away from the substrate 600 and is parallel to the bottom surface 609 of the substrate 600. The side surface 623 extends from the periphery of the top surface 621 and at least includes a pair of side surfaces 623 extending from the top surface 621 along the long sides of the elongated ladder platform. The side surface 623 is inclined to the lower surface 609 of the base 600. The angle between the side surface 623 and the top surface 621 is an obtuse angle.

In this embodiment, the elongated terrace-shaped microstructures 62 are closely connected with each other without an interval. The second optical surface 604 includes the lower surface 609 of the substrate 600. The first light-transmitting portion 620 of the first optical surface 603 includes a top surface 621 of an elongated terrace. The second transparent portion 622 of the first optical surface 603 includes the side surface 623 of the elongated terrace. In this embodiment, the elongated terrace is a single-layer elongated convex structure, and the top surface 621 of the elongated terrace serving as the first transparent portion 620 is a continuously expanding plane.

As shown in FIG. 18, the fourteenth embodiment of the present application provides an optical film structure 6 that can be used in the above-mentioned backlight module 4, which is basically the same as the optical film structure 6 provided in the thirteenth embodiment, mainly The difference is that the long strip terrace-shaped microstructures 62 on the same

film layer unit

601 or 602 also have a predetermined separation distance between each other. A part of the first optical surface 603 located in the spaced area is approximately parallel to the lower surface 609 of the substrate 600 serving as the second optical surface 604, and may also serve as the first transparent portion 620 of the first optical surface 603. Therefore, in this embodiment, the first light-transmitting portion 620 includes a top surface 621 of an elongated terrace and a part of the first optical surface 603 located in the space between adjacent microstructures 62. The part of the first optical surface 603 may be a part of the substrate 600 that is not covered by the microstructure 62 or an outer surface of the material layer of the microstructure 62 covering the space area.

As shown in FIG. 19, the fifteenth embodiment of the present application provides an optical film structure 6 that can be used in the aforementioned backlight module 4, which is basically the same as the optical film structure 6 provided in the fourteenth embodiment, mainly The difference is that: the elongated microstructure 62 may also be a elongated triangular prism. The elongated triangular prism stands upright on the upper surface 608 of the base 600. The elongated triangular prism shape is an erect triangle along the cross section perpendicular to the edge. The elongated prism shape includes a pair of side surfaces 624 extending along its length. The pair of side surfaces 624 are respectively inclined to the upper surface 608 and/or the lower surface 609 of the substrate 600, and the included angle with the upper surface 608 of the substrate 600 is an obtuse angle. The pair of side surfaces 624 intersect at one of the edges above the base 600. The pair of side surfaces 624 respectively intersect with the upper surface 608 of the base 600 to form the other two edges of the elongated triangular prism. The elongated triangular prism-shaped microstructures 62 on the same

film layer unit

601 or 602 have a predetermined separation distance from each other. A part of the first optical surface 603 located in the interval area between the adjacent microstructures 62 and the lower surface 609 of the substrate 600 serving as the second optical surface 604 are kept substantially parallel. Therefore, in this embodiment, the first light-transmitting portion 620 of the first optical surface 603 includes a part of the first optical surface 603 located in the interval area between the adjacent microstructures 62. The second transparent portion 622 includes a pair of side surfaces 624 of the elongated triangular prism.

As shown in FIG. 20, the sixteenth embodiment of the present application provides an optical film structure 7 that can be used in the above-mentioned backlight module 4, which is basically the same as the optical film structure 6 provided by the thirteenth embodiment, mainly The difference is that the first light-transmitting portion 720 on each microstructure 72 includes a plurality of unconnected planar areas, and the unconnected planar areas are connected by the second light-transmitting portion 722. For example, in this embodiment, the microstructure 72 has a double-layered stepped shape, and includes a first protrusion 723 provided on the substrate 700 and a second protrusion formed on the top surface of the first protrusion 723. From 724. The first protrusion 723 is an elongated terrace extending in a specific direction. The second protrusion 724 is an upright elongated prism formed on the top surface of the first protrusion 723. The second protrusion 724 extends in the same direction as the first protrusion 723. The top surface of the elongated terrace is kept parallel to the lower surface 709 of the base 700. The side surface of the elongated prism body and the side surface of the elongated terrace are inclined to the lower surface 709 of the base 700. In this embodiment, the first light-transmitting portion 720 includes partial regions on the top surface of the elongated terrace on opposite sides of the prism body, and the partial regions are separated by the prism body. They are not connected to each other. The second transparent portion 722 includes the side surface of the elongated prism and the side surface of the elongated terrace. The angle between the side surface of the elongated prism body and the side surface of the elongated prism and the top surface of the elongated terrace is an obtuse angle. The second light-transmitting portion 722 respectively connects a plurality of connected plane areas where the first light-transmitting portion 720 is located.

It can be understood that the second protrusion 724 can also be replaced by a groove structure formed on the top surface of the first protrusion 723 and the same shape as the second protrusion 724. For example, the groove structure is an elongated prism groove.

In this embodiment, the elongated terrace-shaped microstructures 72 on the same

film layer unit

701 or 702 are closely adjacent to each other without a gap. Alternatively, the elongated terrace-shaped microstructures 72 on the same

film layer unit

701 or 702 may also have a predetermined separation distance between each other. The overall layout can be referred to as shown in FIG. 18. I will not repeat them here. A portion of the first optical surface 703 located in the spaced area is kept parallel to the lower surface 709 of the substrate 700 as the second optical surface 704, and may also serve as the first light-transmitting portion 720 of the first optical surface 703.

As shown in FIG. 21, the seventeenth embodiment of the present application provides an optical film structure 8 that can be used in the above-mentioned backlight module 4, which is basically the same as the optical film structure 5 provided in the ninth embodiment, with the main differences It is that: the optical film layer structure 8 includes a film layer unit 80. The substrate 800 of the film layer unit 80 is provided with a plurality of the microstructures 82 arranged in an array.

In this embodiment, each of the microstructures 82 is a rectangular parallelepiped bump, which includes a top surface 821 facing away from the base 800 and a side surface 823 extending from the periphery of the top surface 821. The top surface 821 is parallel to the bottom surface 809 of the base 800. The side surface 823 is perpendicular to the top surface 821. The top surface 821 is rectangular, which is a continuously expanding plane area. The first transparent portion 820 of the first optical surface 803 includes the top surface 821 of the rectangular parallelepiped bump. The second light transmitting portion 822 of the first optical surface 803 includes the side surface 823 of the rectangular parallelepiped bump.

It is understandable that due to the spacing between the microstructures 82, the part of the first optical surface 803 located in the spacing area, for example: the part of the substrate 800 that is not covered by the microstructure 82 or is The outer surface of the material layer of the microstructure 82 covering the spaced region is parallel to the lower surface 809 of the substrate 800 as the second optical surface 804. Therefore, the first light-transmitting portion 820 further includes a part of the first optical surface 803 on the film layer unit 80 located in the interval area.

It is understandable that the second optical surface 804 of the film layer unit 80 may also be provided with the light diffusion layer (not shown) for diffusing backlight light.

Alternatively, in other embodiments, the optical film layer structure 8 may also include two or more film layer units 80 with similar structures. The specific situation depends on the light-gathering ability of the film layer unit 80 and the backlight brightness requirements of the liquid crystal display panel 30, and there is no limitation here. The positions of the microstructures 82 on the different film layer units 80 or the positions of the intervals between the microstructures 82 are staggered. That is, the microstructures 82 on the film layer unit 80 located below are aligned with the spacing positions on the film layer unit 80 located above, so that the backlight light passes through the first film layer unit 80 through the first light transmitting portion 820 For the second time, there is a higher probability that the second film layer unit 80 can pass through the second light-transmitting portion 822, which is beneficial to the uniformity of the backlight emission.

As shown in FIG. 22, the eighteenth embodiment of the present application provides an optical film structure 9 that can be used in the above-mentioned backlight module 4, which is basically the same as the optical film structure 8 provided in the seventeenth embodiment, mainly The difference is that the first light-transmitting portion 920 on each microstructure 92 includes multiple connected regions. The multi-connected area is formed by removing at least a part of the area enclosed by a simple closed curve, such as a ring area.

In this embodiment, the plurality of microstructures 92 are arranged in an array on the substrate 900. Each microstructure 92 has a double-layered stepped shape, and includes a first protrusion 923 provided on the upper surface 908 of the substrate 900 and a second protrusion 924 formed on the top surface of the first protrusion 923. The first protrusion 923 may have a pyramid shape. The second protrusion 924 may be an upright pyramid formed on the top surface of the first protrusion 923. Wherein, the part of the top surface of the first protrusion 923 surrounding the second protrusion 924 is a ring-shaped multi-connected area. The first light-transmitting part 920 on the microstructure 92 is a ring-shaped multi-connected area. The top surface of the first protrusion 923 is parallel to the upper surface 908 and the lower surface 909 of the base 900. The lower surface 909 of the substrate 900 is the second optical surface 904 of the film unit 90. Therefore, in this embodiment, the first light-transmitting portion 920 includes a multi-connected area surrounding the second protrusion 924 on the top surface of the first protrusion 923, and the multi-connected area is an annular area. . The second transparent portion 922 includes a side surface of the second protrusion 924 and a side surface of the first protrusion 923. The angles between the side surface of the second protrusion 924 and the side surface of the first protrusion 923 and the top surface of the first protrusion 923 are obtuse angles.

Alternatively, the first protrusion 923 of the microstructure 92 may also be in the shape of a truncated cone. The second protrusion 924 may also be a cone. Alternatively, the first protrusion 923 and the second protrusion 924 are any combination of a truncated cone, a truncated cone, a pyramid, and a cone, respectively.

Alternatively, the number of stages of the microstructure 92 can also be two or more. The top surface of each layer of protrusions substantially parallel to the second optical surface 904 can be used as the first light-transmitting portion 920 on the microstructure 92, and the side surface of the protrusion structure can be used as the microstructure 92 The second light transmission portion 922.

Alternatively, the second protrusion 924 can also be replaced by a groove structure formed on the top surface of the first protrusion 923 with the same shape as the second protrusion 924. For example, the groove structure is a pyramid or conical groove.

In this embodiment, the microstructures 92 are arranged closely adjacent to each other with no interval. Alternatively, in other embodiments, the microstructures 92 are arranged at a predetermined interval between each other. A part of the first optical surface 903 located in the spaced area is kept parallel to the lower surface 909 serving as the second optical surface 904, and may also serve as the first light transmitting portion 920 of the first optical surface 903.

As shown in FIG. 23, the nineteenth embodiment of the present application provides an optical film structure 9 that can be used in the above-mentioned backlight module 4, which is basically the same as the optical film structure 9 provided in the eighteenth embodiment, mainly The difference is that the microstructure 92 is a plurality of single-layer protrusions 923 arranged in an array on the substrate 900. The shape of the single-layer protrusion 923 may be a ladder or truncated cone shape. The single-layer protrusion 923 is disposed on the upper surface 908 of the substrate 900. The single-layer protrusion 923 includes a top surface 921 and a side surface 925 extending from the periphery of the top surface 921. The top surface 921 of the single-layer protrusion 923 is kept parallel to the upper surface 908 and the lower surface 909 of the base 900. The side surface 925 of the single-layer protrusion 923 is inclined to the top surface 921 and the upper surface 908 of the base 900. The angles between the side 925 of the single-layer protrusion 923 and the top surface 921 and the upper surface 908 of the base 900 are obtuse angles. In this embodiment, the single-layer protrusions 923 in the shape of terraces or truncated cones are closely adjacent to each other without a gap. The lower surface 909 of the substrate 900 is the second optical surface 904. The first transparent portion 920 includes a top surface 921 of the single-layer protrusion 923. The second transparent portion 922 includes the side surface 925 of the single-layer protrusion 923.

As shown in FIG. 24, the twentieth embodiment of the present application provides an optical film structure 9 that can be used in the aforementioned backlight module 4, which is basically the same as the optical film structure 9 provided in the nineteenth embodiment, mainly The difference is that there is a predetermined interval between the single-layer protrusions 923 arranged in an array. The part of the first optical surface 903 located in the spaced area, for example: the part of the substrate 900 that is not covered by the single-layer protrusions 923 or the single-layer protrusions 923 covering the spaced area The outer surface of the material layer is parallel to the lower surface 909 of the substrate 900 as the second optical surface 904. Therefore, the first light-transmitting portion 920 further includes a part of the first optical surface 903 on the film unit 90 located in the spaced area.

As shown in FIG. 25, the twenty-first embodiment of the present application provides an optical film structure 9 that can be used in the aforementioned backlight module 4, which is basically the same as the optical film structure 9 provided in the twentieth embodiment. The main difference is that the single-layer protrusions 923 arranged in an array with a predetermined interval between each other are conical or pyramidal, and do not have a top surface parallel to the upper surface 908 and/or the lower surface 909 of the base 900. Therefore, the first light-transmitting portion 920 is a part of the first optical surface 903 of the film unit 90 located in the interval area, for example: the substrate 900 is not covered by the single-layer protrusion 923 Part of or cover the outer surface of the single-layer protrusion 923 in the spaced area.

Compared with the prior art, the optical film structure 5, the backlight module 4, the display device 3, and the electronic device 1 provided by the present application are provided with a reasonable microstructure 52 shape to achieve the backlight light and Detecting the two-way penetration of light is beneficial to realize under-screen sensing without affecting the display effect, thereby further increasing the screen-to-body ratio of the electronic device 1 and enhancing the visual experience of the electronic device.

In the description of this specification, the description with reference to the terms “one embodiment”, “certain embodiments”, “exemplary embodiments”, “examples”, “specific examples”, or “some examples” etc. means to combine The specific features, structures, materials, or characteristics described in the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above-mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials, or characteristics can be combined in any one or more embodiments or examples in an appropriate manner.

The above are only the preferred embodiments of this application and are not intended to limit this application. Any modification, equivalent replacement and improvement made within the spirit and principle of this application shall be included in the protection of this application. Within range.

Claims

An optical film layer structure for condensing backlight light and transmitting detection light, which is characterized in that it comprises one or more film layer units, and each film layer unit includes a first optical surface and a second optical surface that are arranged oppositely, The separation distance between at least a part of the first optical surface and at least a part of the second optical surface that the same light passes through when the light passes through the film layer unit remains unchanged, and defines the at least a part of the first optical surface The optical surface is a first light-transmitting portion, and the propagation direction of at least a part of the light passing through the film layer unit through the first light-transmitting portion is unchanged.
5. The optical film structure of claim 1, wherein the second optical surface comprises a plane or is a plane as a whole, and the first light-transmitting portion is kept parallel to the second optical surface.
8. The optical film structure of claim 1, wherein the first light-transmitting portion is a flat surface.
5. The optical film structure of claim 1, wherein the first optical surface comprises at least two first light-transmitting parts, wherein at least one of the first light-transmitting parts is opposite to the second optical surface The vertical pitch of the part is the same as or different from the vertical pitch of another part of the first light transmitting portion.
3. The optical film structure of claim 1, wherein the first optical surface, ie, the second optical surface, is a boundary surface when light passes through the film unit.
The optical film structure according to any one of claims 1-5, wherein the first optical surface further comprises a second light-transmitting part, and the light is transmitted from the same layer when passing through the film unit. The separation distance between the second light-transmitting portion and the corresponding part of the second optical surface through which the light passes gradually changes, so that at least a part of the light transmitted therethrough changes in the propagation direction and converges in a specific direction.
7. The optical film structure of claim 6, wherein the second light-transmitting portion is not parallel to the corresponding part of the second optical surface.
7. The optical film structure of claim 6, wherein the first optical surface comprises a plurality of first light-transmitting portions, and the second light-transmitting portions are connected between each of the first light-transmitting portions .
7. The optical film structure of claim 6, wherein the second light-transmitting portion comprises an inclined surface, and the inclined surface is inclined to the first light-transmitting portion.
9. The optical film structure of claim 9, wherein the inclined surface is connected to the first light-transmitting portion, and the angle between the two is an obtuse angle.
7. The optical film structure of claim 6, wherein the second light-transmitting portion comprises a plane or a curved surface, and the plane or the curved surface is perpendicularly connected to the first light-transmitting portion.
8. The optical film structure of claim 1, wherein the first light-transmitting portion includes a continuously expanding plane area; or

The first light-transmitting portion includes a plurality of planar areas that are not connected to each other; or

The first light-transmitting part includes a multi-connected area formed by removing at least a part of the area enclosed by a simple closed curve.
The optical film structure of claim 1, wherein each film layer unit includes a substrate and a plurality of microstructures, the substrate includes an upper surface and a lower surface opposite to the upper surface, and the multiple A microstructure is formed on the upper surface of the substrate, and the second optical surface is the lower surface of the substrate.
The optical film structure of claim 13, wherein each microstructure includes a top surface, and the top surface of the microstructure is a side surface facing away from the substrate and is in line with the bottom surface of the substrate. In parallel, the first light-transmitting portion includes the top surface of the microstructure.
14. The optical film structure of claim 14, wherein the top surface of the microstructure includes a flat surface or the whole is a flat surface.
The optical film structure of claim 13, wherein the microstructure further comprises a side surface located between the top surface of the microstructure and the upper surface of the substrate, and the second light transmitting portion comprises the The side of the microstructure.
16. The optical film structure of claim 16, wherein the side surface is an inclined surface, and the angle between the side surface and the first transparent portion is an obtuse angle.
The optical film structure of claim 13, wherein the microstructure is a terrace, a rectangular parallelepiped, or a round platform.
The optical film layer structure of claim 13, wherein the optical film layer structure comprises a first film layer unit and a second film layer unit, the first film layer unit and the second film layer unit The microstructures are elongated protrusions extending in a specific direction, wherein the first film layer unit and the second film layer unit are arranged in sequence along the optical path, and the extension directions of the microstructures of the two are perpendicular to each other.
The optical film structure of claim 19, wherein the elongated protrusions are elongated rectangular parallelepipeds or elongated terraces, and the elongated protrusions include a side facing away from the substrate The top surface of the top surface and the side surface extending from the periphery of the top surface, the top surface is parallel to the bottom surface of the base, the first transparent portion includes the top surface of the elongated protrusion, so The second light-transmitting portion includes the side surface of the elongated protrusion.
The optical film structure of claim 13, wherein the first light-transmitting portion includes a plurality of unconnected planar regions on the microstructure, and the planar regions are parallel to the substrate lower surface.
The optical film structure of claim 19 or 21, wherein the microstructure has a double-layer stepped shape, including a first protrusion provided on the substrate and a second protrusion formed on the top surface of the first protrusion. A protrusion, the first protrusion is an elongated terrace extending in a specific direction, the second protrusion is an upright elongated triangular prism formed on the top surface of the first protrusion, the The elongated triangular prism extends in the same direction as the elongated terrace, and the first light-transmitting portion includes two opposite sides of the elongated triangular prism on the top surface of the elongated terrace. Unconnected flat areas.
13. The optical film structure of claim 13, wherein the optical film structure comprises a film unit, and the microstructure is a plurality of bumps arranged in an array arranged on the substrate.
The optical film structure of claim 23, wherein the bumps are rectangular parallelepipeds, pyramids, or truncated cones, and the bumps include a top surface facing away from the substrate and a surface formed by the top surface. A side surface extending from the periphery, the top surface is parallel to the lower surface of the base, and the first light-transmitting portion includes the side surface of the bump.
The optical film structure of claim 13, wherein the first light-transmitting portion includes a multi-connected area, and the multi-connected area is formed by removing at least a part of the area enclosed by a simple closed curve. form.
The optical film structure of claim 23 or 25, wherein the microstructure is a double-layer stepped structure, including a first protrusion provided on a substrate and a first protrusion formed on the top surface of the first protrusion. A second protrusion, the first protrusion is a pyramid or a rectangular parallelepiped or a truncated cone, the second protrusion is a pyramid or a cone, and the top surface of the first transparent portion including the first protrusion surrounds the first protrusion Two convex annular areas.
22. The optical film structure according to any one of claims 13-21 and 23-25, wherein the plurality of microstructures are arranged closely with a predetermined interval or no interval.
The optical film structure of claim 27, wherein when the plurality of microstructures are arranged at a predetermined interval, the first light-transmitting portion further includes a part of the The first optical surface.
The optical film structure of claim 19, wherein the microstructure is a plurality of elongated triangular prisms arranged at predetermined intervals, and the first light transmitting portion includes The cross section of the elongated triangular prism along the vertical edge is an erect triangle, and the elongated triangular prism includes a pair of side surfaces inclined to the lower surface of the base. The second light-transmitting part includes a pair of side surfaces of a long triangular prism.
The optical film structure of claim 23, wherein the microstructures are upright triangular prisms or pyramids, and the microstructures are arranged at predetermined intervals, and the first light-transmitting portion It includes a part of the first optical surface located in the spaced area, and the second light-transmitting portion includes the side surface of the triangular prism or the triangular pyramid.
The optical film structure according to any one of claims 13-21, 23-25 and 28-30, wherein the microstructure and the substrate are made of the same or different materials.
The optical film structure of claim 31, wherein when the material of the microstructure is different from that of the substrate, the refractive index of the material of the microstructure is the same or similar to that of the substrate, The light rays travel approximately straight when passing through the interface between the microstructure and the substrate.
3. The optical film structure of claim 1, wherein a light diffusion layer for diffusing light is provided on the second optical surface of the film unit.
A backlight module, which is characterized in that it is used to provide backlight light to a display panel and transmit detection light emitted and/or reflected by an external object to a sensing module, and the detection light is used to detect or identify external For biological feature information of the object, the backlight module includes the optical film structure according to any one of claims 1 to 33.
The backlight module of claim 34, further comprising a diffusion sheet for diffusing backlight light, the optical film layer structure and the diffusion sheet are arranged in sequence along the light path, and the diffusion sheet passes through the substrate It is made of rough microstructure like ground glass; or

The diffusion sheet is made by incorporating diffusion particles on the substrate; or

The diffusion sheet is a membrane layer with a nanoporous structure, and a plurality of nano-level pores are formed in the membrane layer; or

The diffusion sheet is a quantum dot film layer arranged on the light exit surface of the light guide plate, and the quantum dot film layer contains quantum dot material, and the quantum dot material absorbs blue backlight light and converts it into green backlight light and The backlight module further includes a backlight light source for providing backlight light, and the backlight light source is a blue luminous light source.
The backlight module of claim 35, wherein the diffusion particles are made of a material that transmits infrared or near-infrared light and reflects visible light.
The backlight module of claim 35, wherein the average size of the diffusion particles is in the range of 380 nanometers to 780 nanometers.
The backlight module of claim 35, wherein the diffusion effect of the diffusion sheet on the backlight light is greater than the diffusion effect on the detection light.
The backlight module of claim 34, further comprising:

The light guide plate includes a light emitting surface and a bottom surface opposite to the light emitting surface;

The reflective sheet is arranged on one side of the bottom surface and used to reflect the backlight light transmitted from the bottom surface of the light guide plate, wherein the reflective sheet is made of a material that transmits infrared or near-infrared light and reflects visible light.
The backlight module of claim 34, wherein the backlight module is used to provide visible light and can transmit infrared light or near-infrared light.
A display device, characterized in that it comprises a display panel and a backlight module, the display panel is used for displaying pictures, the backlight module is used for providing backlight light to the display panel, wherein the backlight module is The backlight module of any one of claims 33-39.
The display device of claim 41, wherein the display panel is a liquid crystal display panel.
An electronic device, comprising: the display device according to claim 41 or 42 and a sensor module at least partially arranged below the display device, and the sensor module receives through the display device The detection light reflected or/and emitted from an external object to perform corresponding sensing.
The electronic device according to claim 43, wherein the sensor module comprises a receiving unit, the receiving unit is arranged under the backlight module and receives through the display panel and the backlight module The light is detected to perform corresponding sensing.
The electronic device according to claim 44, wherein the sensor module further comprises a transmitting unit, the transmitting unit is used to transmit the detection light to the external object, and the receiving unit is arranged at the Below the backlight module, or arranged beside the display device, is located in the non-display area.
The electronic device according to claim 43, wherein the sensor module is used to perform one or more of fingerprint sensing, three-dimensional face sensing, and living body sensing.