Diffusion film and fingerprint recognition components

Abstract

The present invention provides a diffusion film and a fingerprint recognition component, the diffusion film comprising: a carrier having a plurality of setting layers along the thickness direction, each setting layer being provided with a plurality of filling areas with diffusion particles distributed therein and a plurality of vacant areas without diffusion particles distributed therein, and at least some areas of the filling areas on adjacent setting layers do not overlap. The diffusion film and the fingerprint recognition component of the embodiments of the present invention make it possible to use the under-screen optical fingerprint in an LCD display screen.

Description

Technical Field

[0001] The present invention relates to the technical field of fingerprint recognition under a liquid crystal screen, and in particular to a diffusion membrane, and a fingerprint recognition component using or configured with the diffusion membrane. Background Art

[0002] The description in this section merely provides background information related to the present disclosure and does not constitute prior art.

[0003] At present, under-screen optical fingerprints are mostly used in OLED displays, and rarely in LCD displays. The reason is that there is a diffusion film in the backlight of the LCD display that scatters light to make the display uniform. The light reflected from the finger becomes disordered scattered light after passing through the diffusion film, making it difficult to form an image in the light-sensing element under the LCD display.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0005] Based on the aforementioned defects of the prior art, the present invention provides a diffusion film, and a fingerprint recognition component using or configured with the diffusion film, thereby making it possible to use under-screen optical fingerprints in LCD display screens.

[0006] In order to achieve the above object, the present invention provides the following technical solutions.

[0007] A diffusion membrane comprises: a carrier having a plurality of setting layers along its thickness direction, each of the setting layers being provided with a plurality of filling areas where diffusion particles are distributed and a plurality of vacant areas where diffusion particles are not distributed; wherein at least some areas of the filling areas on adjacent setting layers do not overlap.

[0008] Preferably, a projection of the filling area on any one of the setting layers toward another setting layer adjacent to the setting layer has at least a portion of the projection area located outside the range of the filling area on the other setting layer.

[0009] Preferably, the vacant area on any one of the setting layers corresponds to the filled area on another setting layer adjacent to the setting layer.

[0010] Preferably, the carrier is a single-layer structure, so that the carrier has two opposite surfaces, and the two surfaces respectively define two setting layers; or,

[0011] The carrier is a multi-layer structure, so that the carrier has multiple surfaces, and the multiple surfaces respectively define multiple setting layers.

[0012] A fingerprint recognition component, comprising:

[0013] A diffusion film as described in any one of the above embodiments; wherein the carrier and the vacant area on the adjacent setting layer form an incident path for light to pass through in a non-diffusion form;

[0014] A first light source located on one side of the diffusion film, wherein the light emitting direction of the first light source corresponds to the incident path;

[0015] The light sensing element and the first light source are located on the same side of the diffusion film.

[0016] Preferably, the intersection of the extended line of the light emitting direction of the first light source and the diffusion film is located on the empty area, and the intersection of the light emitted by the first light source and the diffusion film when emitted through the incident path is also located on the empty area.

[0017] Preferably, a light emitting direction of the first light source forms a first preset angle with the diffusion film, and the first preset angle is greater than 0° and less than 90°.

[0018] Preferably, the empty areas on the carrier and the adjacent setting layer also form a retroreflective path through which light can pass without diffusion; the retroreflected light emitted by the first light source after being reflected by the finger at least partially reaches the light sensing element through the retroreflective path.

[0019] Preferably, the intersection point of the retroreflected light and the diffusion film is located on the empty area, and the intersection point of the retroreflected light with the diffusion film when emitted through the retroreflection path is also located on the empty area.

[0020] Preferably, the retroreflected light forms a second preset angle with the diffusion film, and the second preset angle is greater than 0° and less than 90°.

[0021] Preferably, the carrier comprises a substrate having a first surface and a second surface opposite to each other, wherein the first surface and the second surface define a first setting layer and a second setting layer respectively.

[0022] Preferably, the first surface has a plurality of first filling areas where diffusion particles are distributed and a plurality of first vacant areas where diffusion particles are not distributed, and the second surface has a plurality of second filling areas where diffusion particles are distributed and a plurality of second vacant areas where diffusion particles are not distributed;

[0023] A plurality of the first filling areas corresponds to a plurality of the second vacant areas, and a plurality of the second filling areas corresponds to a plurality of the first vacant areas.

[0024] Preferably, a plurality of the first filling areas and a plurality of the first vacant areas are arranged in the form of a rectangular array, and a plurality of the second filling areas and a plurality of the second vacant areas are also arranged in the form of a rectangular array.

[0025] Preferably, a light guide sheet is disposed on a side of the substrate close to the first light source, and a brightness enhancement film is disposed on the other side of the substrate away from the first light source;

[0026] At least two of the substrate, the light guide plate and the brightness enhancement film constitute the carrier.

[0027] Preferably, the light guide plate has a third surface and a fourth surface facing each other, and the brightness enhancement film has a fifth surface and a sixth surface facing each other;

[0028] The third surface and the fourth surface define a third setting layer and a fourth setting layer respectively, and the fifth surface and the sixth surface define a fifth setting layer and a sixth setting layer respectively;

[0029] A plurality of filling regions in which diffusion particles are distributed and a plurality of vacant regions in which diffusion particles are not distributed are configured on at least two of the first to sixth setting layers.

[0030] Preferably, the first light source is any one of a visible light source, an invisible light source or a backlight light source.

[0031] Preferably, a reflective sheet is provided on a side of the carrier close to the first light source, and the first light source is an invisible light source;

[0032] The fingerprint recognition component further includes a second light source, which is disposed between the reflective sheet and the carrier; or, the second light source is disposed on a side of the carrier;

[0033] The reflective sheet can allow the light emitted by the first light source to pass through, and the reflective sheet can reflect the light emitted by the second light source toward the diffusion film sheet.

[0034] Preferably, a display panel and a cover glass are arranged on the other side of the carrier away from the first light source, and the display panel is located between the cover glass and the carrier.

[0035] The fingerprint recognition component of the embodiment of the present invention configures the diffusion film of the embodiment of the present invention in the LCD display screen. The invisible light emitted by the first light source at a specific angle can penetrate the LCD display screen to reach the finger, and the light reflected by the finger can penetrate the LCD display screen at a specific angle to reach the photosensitive element, thereby realizing under-screen fingerprint recognition.

[0036] With reference to the following description and accompanying drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not thereby limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present invention include many changes, modifications and equivalents.

[0037] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0038] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes and are used to help understand the present invention. They do not specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances. In the drawings:

[0040] Figure 1A It is a structural schematic diagram of a fingerprint recognition component equipped with a diffusion film according to a first preferred embodiment of the present invention;

[0041] Figure 1B It is a structural schematic diagram of a fingerprint recognition component equipped with a diffusion film according to a second preferred embodiment of the present invention;

[0042] Figure 1C It is a structural schematic diagram of a fingerprint recognition component equipped with a diffusion film according to a third preferred embodiment of the present invention;

[0043] Figure 1D It is a structural schematic diagram of a fingerprint recognition component equipped with a diffusion film according to a fourth preferred embodiment of the present invention;

[0044] Figure 1E A schematic structural diagram of a fingerprint recognition component equipped with a diffusion film according to a fifth preferred embodiment of the present invention;

[0045] Figure 1F A schematic structural diagram of a fingerprint recognition component equipped with a diffusion film according to a sixth preferred embodiment of the present invention;

[0046] Figure 2A A schematic diagram of a structure in which the filling areas on adjacent arrangement layers do not overlap in part in an embodiment;

[0047] Figure 2B A schematic diagram of a structure in which the filling areas on adjacent arrangement layers do not overlap at all in one embodiment;

[0048] Figure 2C is a schematic diagram of a structure in which the filling areas on adjacent arrangement layers do not overlap at all in another embodiment;

[0049] Figure 3A for Figures 1A to 1F Schematic diagram of the distribution of filled areas and empty areas on a setting layer;

[0050] Figure 3B for Figures 1A to 1F Schematic diagram of the distribution of filled and empty areas on another settings layer in . DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0052] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0054] In this specification, the direction of the components of the embodiments of the present invention in a normal use state that points to or faces the user is defined as "upper", and the direction opposite thereto or facing away from the user is defined as "lower".

[0055] Specifically, when the diffusion film 4 of the embodiment of the present invention is configured in an electronic device, the direction in which the display screen of the electronic device points to or faces the user is defined as "up", and the opposite direction or the direction facing away from the user is defined as "down".

[0056] More specifically, Figures 1A to 1F The upward direction indicated in the figure is defined as “up”. Figures 1A to 1F The downward direction indicated in FIG. 1 is defined as “down”.

[0057] It is worth noting that the definitions of various directions in this specification are only for the convenience of explaining the technical solution of the present invention, and do not limit the direction of the diffusion membrane 4 of the embodiment of the present invention in other scenarios including but not limited to use, testing, transportation and manufacturing, which may cause the orientation of the component to be reversed or the position to be changed.

[0058] The diffusion film 4 provided in the embodiment of the present invention can be used in a fingerprint recognition component, making under-screen fingerprint recognition possible in an LCD display screen.

[0059] Specifically, Figures 1A to 1F As shown, the fingerprint recognition component of the embodiment of the present invention may generally include a first light source 1 , a light sensing element 2 , and an LCD display screen 3 including a diffusion film 4 .

[0060] The first light source 1 is used to emit signal light that can be reflected by a finger to the LCD display screen 3 , and the first light source 1 may be a visible light source or an invisible light source.

[0061] Generally, the wavelength range of light visible to the naked eye is between 380 and 780 nm. Light outside the visible light range, i.e. light with a wavelength less than 380 nm or greater than 780 nm, is invisible light.

[0062] When the first light source 1 is a visible light source, it may emit any suitable light with a wavelength in the range of 380 to 780 nm, such as white light.

[0063] When the first light source 1 is an invisible light source, it may emit any suitable light with a wavelength less than 380 nm or greater than 780 nm, for example, including but not limited to infrared light, ultraviolet light, far infrared light, etc.

[0064] Therefore, the first light source 1 can be realized by using a corresponding light source emitting device, such as LED (to realize visible light), infrared light source, ultraviolet light source, far infrared light source (to realize invisible light), etc., which is not limited in the present invention.

[0065] Of course, the first light source 1 can also be a backlight light source of the LCD backlight source itself. That is, the backlight light source of the LCD display screen 3 itself can also play the same role as the first light source 1. In other words, at this time, the first light source 1 can be removed without affecting the normal use of the fingerprint recognition component of the embodiment of the present invention.

[0066] The backlight source provided by the LCD display screen 3 itself can be Figures 1A to 1F The second light source 307 is shown as an example. The second light source 307 is generally a visible light source such as an LED, which can be arranged on the back side of the diffusion film 4 or on the side of the diffusion film 4.

[0067] Specifically, the diffusion film 4 is provided with a carrier 401, and a reflective sheet 306 is provided on one side of the carrier 401 close to the first light source 1. The second light source 307 can be provided between the reflective sheet 306 and the carrier 401 (eg, Figure 1C , Figure 1D and Figure 1F The embodiment shown in the figure) can also be arranged on the side of the carrier 401 (such as Figure 1A , Figure 1B and Figure 1E illustrative embodiment).

[0068] The reflective sheet 306 can emit as much light from the second light source 307 as possible toward the outside of the LCD display screen 3 to improve the display brightness of the LCD display screen 3. Specifically, the reflective sheet 306 can reflect the light emitted by the second light source 307 toward the direction of the diffusion film 4, so that the light can penetrate the diffusion film 4 and continue to radiate outward.

[0069] In order to ensure that the light emitted by the first light source 1 can reach the user's finger smoothly, the first light source 1 is preferably an invisible light source such as an infrared light source when a reflector 306 is provided. Since the invisible light source has good penetrability, the light emitted by the invisible light source as the first light source 1 can penetrate the reflector 306.

[0070] In this embodiment, the first light source 1 and the light sensing element 2 are located on the same side of the diffusion film 4 (eg Figures 1A to 1F As shown, they are all located below the diffusion membrane 4 and are spaced apart from the diffusion membrane 4.

[0071] The photosensitive element 2 is mainly used to convert the signal light carrying the user's fingerprint information into an electrical signal to realize the collection and imaging of the fingerprint.

[0072] In this embodiment, the light sensing element 2 may be only a fingerprint chip, that is, the fingerprint chip is constructed alone to form the light sensing element 2 .

[0073] Alternatively, the light sensing element 2 may also be a fingerprint sensor equipped with a fingerprint chip, that is, the fingerprint sensor equipped with a fingerprint chip forms the light sensing element 2 .

[0074] Alternatively, the light sensing element 2 may also be a fingerprint sensor array (such as the known embodiment provided by announcement number CN203909812U). The fingerprint sensor array may include a plurality of fingerprint sensors, each of which is equipped with a fingerprint chip.

[0075] In other words, the light sensing element 2 may be any suitable structure equipped with a fingerprint chip, and the embodiment of the present invention is not limited to this.

[0076] like Figures 1A to 1F As shown, the LCD display screen 3 may include a substrate 301, and a light guide plate 302 and a brightness enhancement film 303 disposed on both sides of the substrate 301. The light guide plate 302 is close to the first light source 1, and the brightness enhancement film 303 is away from the first light source 1. Therefore, the light guide plate 302 is located between the first light source 1 and the substrate 301, and the substrate 301 is located between the brightness enhancement film 303 and the first light source 1.

[0077] At least one of the substrate 301, the light guide plate 302 and the brightness enhancement film 303 can be used as a carrier 401 for distributing the diffusion particles 402. The carrier 401 together with the diffusion particles 402 distributed thereon form a diffusion film 4.

[0078] The LCD display screen 3 may further include a display panel 304 and a cover glass 305 . The display panel 304 and the cover glass 305 are located on a side of the carrier 401 away from the first light source 1 , and the display panel 304 is located between the cover glass 305 and the carrier 401 .

[0079] In addition, the substrate 301 , the light guide plate 302 , the brightness enhancement film 303 , the display panel 304 and the cover glass 305 are all made of light-transmitting materials to have light-transmitting properties.

[0080] Specifically, the light guide sheet 302 can transform a point light source into a surface light source, thereby improving the display uniformity of the LCD display screen 3. The brightness enhancement film 303 can improve the luminous efficiency of the backlight system of the LCD display screen 3.

[0081] The display panel 304 has a similar function to the light guide plate 302, and is used to make the light brightness uniform. The cover glass 305 can protect and decorate the appearance of the LCD display screen 3, and provide a finger pressing area for the user.

[0082] In the prior art, the diffusion particles contained in the diffusion membrane are distributed on one side of the supporting substrate (the supporting substrate is generally similar to the substrate 301 in the embodiment of the present invention), and specifically, the diffusion particles are spread all over the upper surface or the lower surface of the supporting substrate. That is, in the prior art, the diffusion particles on the diffusion membrane are continuously distributed on one side of the supporting substrate.

[0083] In contrast, in this embodiment, the diffusion particles 402 are not distributed continuously on one surface of the carrier 401, but are distributed on multiple surfaces of the carrier 401. Moreover, the diffusion particles 402 on each surface are arranged discontinuously in different regions, and the regions where the diffusion particles 402 are arranged on multiple surfaces are arranged in a staggered manner.

[0084] That is, the diffusion particles 402 on the multiple surfaces of the carrier 401 are not spread all over the surface, but are arranged in multiple free area blocks. Moreover, the area blocks where the diffusion particles 402 are arranged on the multiple surfaces of the carrier 401 at least have non-overlapping parts.

[0085] Specifically, the carrier 401 may be configured to have a plurality of arrangement layers along its thickness direction. Each arrangement layer is configured with a plurality of filling regions 5 where the diffusion particles 402 are distributed and a plurality of vacant regions 6 where the diffusion particles 402 are not distributed. The filling regions 5 on adjacent arrangement layers at least partially do not overlap.

[0086] In this embodiment, at least part of the filling areas 5 on adjacent setting layers do not overlap, where the projection of the filling area 5 on any setting layer toward another setting layer adjacent to the setting layer has at least part of the projection area outside the range of the filling area 5 on the other setting layer.

[0087] Specifically, it may include that a portion of the projection area of ​​the filling area 5 on any one setting layer toward another setting layer adjacent thereto is located within the range of the filling area 5 on the other setting layer, and another portion is located outside the range of the filling area 5 on the other setting layer (e.g. Figure 2A illustrative embodiment).

[0088] In this case, the filling areas 5 on adjacent layers do not overlap. Specifically, the shape of the projection of the filling area 5 on any layer toward another adjacent layer intersects with the shape of the filling area 5 on the other layer.

[0089] Alternatively, the projection of the filling area 5 on any one setting layer toward another setting layer adjacent thereto is completely outside the range of the filling area 5 on the other setting layer (eg, Figure 2B and Figure 2Cillustrative embodiment).

[0090] In this case, the filling areas 5 on adjacent layers do not overlap at all. Specifically, the shape of the projection of the filling area 5 on any layer toward another adjacent layer is co-linear or separated from the shape of the filling area 5 on the other layer.

[0091] Since the diffusion particles 402 are not distributed continuously on any setting layer of the carrier 401, all setting layers of the carrier 401 should have vacant areas 6 without diffusion particles 402. Specifically, an vacant area 6 may be formed between two adjacent filling areas 5 on the same setting layer.

[0092] In a preferred embodiment, the vacant area 6 on any one setting layer corresponds to the filled area 5 on another setting layer adjacent thereto. In this way, the diffusion particles 402 distributed in the filled area 5 on another setting layer correspond to the vacant area 6 on the setting layer adjacent thereto, so that the diffusion particles 402 distributed on two adjacent setting layers do not overlap.

[0093] In this embodiment, the vacant area 6 on any one setting layer and the filled area 5 on another adjacent setting layer may correspond to each other, wherein the projection of the vacant area 6 on any one setting layer toward the other setting layer is at least partially located within the range of the filled area 5 on the other setting layer.

[0094] Specifically, in one case, the projection area of ​​the vacant area 6 on any one setting layer on another setting layer adjacent thereto is equal to the area of ​​the filling area 5 on the other setting layer. Then the projection of the vacant area 6 on any one setting layer toward the other setting layer coincides with the filling area 5 on the other setting layer.

[0095] Alternatively, in another case, the projection area of ​​the vacant area 6 on any one setting layer onto another setting layer adjacent thereto is larger than the area of ​​the filled area 5 on the other setting layer. Then the projection of the vacant area 6 on any one setting layer toward the other setting layer completely covers the filled area 5 on the other setting layer.

[0096] Alternatively, in another case, the projection area of ​​the vacant area 6 on any one setting layer onto another setting layer adjacent thereto is smaller than the area of ​​the filled area 5 on the other setting layer. Then the projection of the vacant area 6 on any one setting layer toward the other setting layer is within the range of the filled area 5 on the other setting layer.

[0097] It should be noted that the filling area 5 and the vacant area 6 can be of any suitable shape and can be arranged on the corresponding setting layer in any feasible arrangement.

[0098] For example, Figure 3A and Figure 3B As shown, the filling area 5 and the vacant area 6 may be square, and the filling area 5 and the vacant area 6 are regularly arranged on the setting layer in a rectangular array.

[0099] By setting the filling area 5 and the vacant area 6 to be square and arranging them in a rectangular array, the utilization rate of the setting layer can be effectively improved.

[0100] Of course, the shapes and arrangement of the filling area 5 and the vacant area 6 are not limited to the above embodiments. In other feasible embodiments, the filling area 5 and the vacant area 6 can be other shapes such as circular, elliptical, irregular, etc.

[0101] Furthermore, the filling areas 5 and the vacant areas 6 may also be arranged in a disorderly and irregular manner, as long as the filling areas 5 on adjacent arrangement layers at least partially do not overlap, and the embodiment of the present invention does not make any specific limitation on this.

[0102] The carrier 401 may be a single-layer structure. Thus, the carrier 401 may have two opposite surfaces, and the two surfaces define two setting layers respectively. That is, the two opposite surfaces of the carrier 401 of the single-layer structure serve as two setting layers respectively.

[0103] A specific implementation method may be that any one of the substrate 301 , the light guide plate 302 , and the brightness enhancement film 303 included in the LCD display screen 3 may be used as the carrier 401 alone.

[0104] Of course, the single-layer carrier 401 may be an additional component, rather than any one of the substrate 301 , the light guide plate 302 , and the brightness enhancement film 303 .

[0105] For example, Figure 1A and Figure 1C In the illustrated embodiment, the carrier 401 may include and only includes the substrate 301 , that is, the substrate 301 alone constitutes the carrier 401 .

[0106] The substrate 301 has a first surface and a second surface opposite to each other. The first surface and the second surface can be respectively Figure 1A and Figure 1C The upper and lower surfaces of the substrate 301 are shown. The first surface and the second surface can serve as the first setting layer and the second setting layer, respectively.

[0107] Following the above description, in this embodiment, the first surface may have a plurality of first filling regions with diffuser particles 402 distributed therein and a plurality of first vacant regions without diffuser particles 402 distributed therein. Similarly, the second surface may have a plurality of second filling regions with diffuser particles 402 distributed therein and a plurality of second vacant regions without diffuser particles 402 distributed therein.

[0108] Furthermore, the first filling regions correspond to the second vacant regions, and the second filling regions correspond to the first vacant regions, so that the filling regions 5 with the diffusion particles 402 distributed on the adjacent layers, ie, the first surface and the second surface of the substrate 301, do not overlap.

[0109] In addition, the plurality of first filling regions and the plurality of first vacant regions may be arranged in a rectangular array on the first surface, and the plurality of second filling regions and the plurality of second vacant regions may also be arranged in a rectangular array on the second surface.

[0110] It should be noted that the light guide sheet 302 or the brightness enhancement film 303 may also constitute the carrier 401 alone, that is, the light guide sheet 302 or the brightness enhancement film 303 may also serve as the carrier 401. Furthermore, when the light guide sheet 302 or the brightness enhancement film 303 serves as the carrier 401, the substrate 301 may be omitted, that is, the LCD display screen 3 may not include the substrate 301.

[0111] Of course, the carrier 401 may also be a multi-layer structure, so that the carrier 401 may have multiple surfaces, and the multiple surfaces may respectively define multiple setting layers.

[0112] The specific implementation method may be that at least two of the substrate 301, the light guide sheet 302, and the brightness enhancement film 303 included in the LCD display screen 3 constitute the carrier 401. For example, the carrier 401 may be any one of the four combinations of substrate 301+light guide sheet 302, substrate 301+brightness enhancement film 303, light guide sheet 302+brightness enhancement film 303, and substrate 301+light guide sheet 302+brightness enhancement film 303.

[0113] Specifically, the light guide plate 302 may have a third surface and a fourth surface facing each other, and the brightness enhancement film 303 may have a fifth surface and a sixth surface facing each other. The third surface and the fourth surface may be respectively as follows: Figures 1A to 1F The upper and lower surfaces, the fifth surface and the sixth surface of the light guide plate 302 are as shown in FIG. Figures 1A to 1F The upper and lower surfaces of the brightness enhancement film 303 are shown.

[0114] Furthermore, the third surface and the fourth surface may define a third setting layer and a fourth setting layer, respectively, and the fifth surface and the sixth surface may define a fifth setting layer and a sixth setting layer, respectively.

[0115] At this time, the carrier 401 is Figures 1A to 1F There are six different arrangement layers in total (in the vertical direction shown). Among the first to sixth arrangement layers, at least two arrangement layers have a plurality of filling areas 5 where diffusion particles 402 are distributed and a plurality of vacant areas 6 where diffusion particles 402 are not distributed.

[0116] For example, among the first to sixth setting layers, two setting layers may have a plurality of filling areas 5 with diffuse particles 402 distributed therein and a plurality of vacant areas 6 without diffuse particles 402 distributed therein, and the other four setting layers may be completely vacant.

[0117] Alternatively, among the first to sixth setting layers, three setting layers may have a plurality of filling areas 5 where the diffusion particles 402 are distributed and a plurality of vacant areas 6 where the diffusion particles 402 are not distributed, and the other three setting layers are in a completely vacant state.

[0118] Alternatively, among the first to sixth setting layers, five setting layers may have a plurality of filling areas 5 where the diffusion particles 402 are distributed and a plurality of vacant areas 6 where the diffusion particles 402 are not distributed, and another setting layer may be completely vacant.

[0119] Alternatively, all the first to sixth arrangement layers have a plurality of filling regions 5 where the diffusion particles 402 are distributed and a plurality of vacant regions 6 where the diffusion particles 402 are not distributed.

[0120] In such Figure 1B In the illustrated embodiment, diffusion particles 402 are distributed on the second surface (lower surface) of the substrate 301 and the fifth surface (upper surface) of the brightness enhancement film 303 , respectively.

[0121] In this embodiment, the substrate 301 and the brightness enhancement film 303 constitute a carrier 401. The carrier 401 is a double-layer structure, which has a total of four setting layers, namely, a first setting layer and a second setting layer defined by the first surface and the second surface, and a fifth setting layer and a sixth setting layer defined by the fifth surface and the sixth surface.

[0122] The first setting layer and the sixth setting layer are in a completely empty state (the first setting layer and the sixth setting layer can be arranged at intervals or overlapped at this time. Figure 1B The second and fifth layers are respectively provided with diffusion particles 402. The double-layered carrier 401 together with the diffusion particles 402 distributed on the second and fifth layers constitute a diffusion membrane 4.

[0123] Or, in Figure 1DIn the illustrated embodiment, diffusion particles 402 are distributed on the fourth surface (lower surface) of the light guide plate 302 and the fifth surface (upper surface) of the brightness enhancement film 303 .

[0124] In this embodiment, the light guide plate 302 and the brightness enhancement film 303 constitute a carrier 401. The carrier 401 is also a double-layer structure, which has a total of four setting layers, namely, a third setting layer and a fourth setting layer defined by the third surface and the fourth surface, and a fifth setting layer and a sixth setting layer defined by the fifth surface and the sixth surface.

[0125] Among them, the third and sixth setting layers are completely vacant ( Figure 1D The schematic diagram shows a situation where a substrate 301 is sandwiched between the first setting layer and the sixth setting layer, and the two are in a spaced state. However, the first setting layer and the sixth setting layer can also be stacked. In this case, there is no substrate 301, and the fourth setting layer and the fifth setting layer have diffusion particles 402 respectively. The double-layer structure of the carrier 401 together with the diffusion particles 402 distributed on the fourth setting layer and the fifth setting layer constitute a diffusion membrane 4.

[0126] Or, in Figure 1E In the illustrated embodiment, diffusion particles 402 are distributed on the first surface (upper surface) of the substrate 301 and the fourth surface (lower surface) of the light guide plate 302 .

[0127] In this embodiment, the substrate 301 and the light guide plate 302 constitute a carrier 401. The carrier 401 is also a double-layer structure, which has a total of four setting layers, namely, a first setting layer and a second setting layer defined by the first surface and the second surface, and a third setting layer and a fourth setting layer defined by the third surface and the fourth surface.

[0128] The second setting layer and the third setting layer are in a completely empty state (the second setting layer and the third setting layer can be arranged at intervals or overlapped at this time. Figure 1E The first and fourth layers are respectively provided with diffusion particles 402. The double-layered carrier 401 together with the diffusion particles 402 distributed on the first and fourth layers constitute a diffusion membrane 4.

[0129] Or, in Figure 1F In the illustrated embodiment, diffusion particles 402 are distributed on the first and second surfaces of the substrate 301 , the third and fourth surfaces of the light guide plate 302 , and the fifth and sixth upper surfaces of the brightness enhancement film 303 .

[0130] In this embodiment, the substrate 301, the light guide plate 302 and the brightness enhancement film 303 constitute a carrier 401. The carrier 401 is also a three-layer structure, which has a total of six setting layers, namely the first setting layer to the sixth setting layer defined by the first surface to the sixth surface respectively. In addition, the first setting layer to the sixth setting layer are respectively provided with diffusion particles 402. The three-layer carrier 401 together with the diffusion particles 402 distributed on its six setting layers constitute a diffusion film 4.

[0131] It is worth noting that the above are only several feasible combinations or implementations of the carrier 401 being a multi-layer structure. In other feasible embodiments, the carrier 401 having a multi-layer structure can be implemented in other ways, and the embodiment of the present invention is not limited to this. For example, the carrier 401 can be an additionally configured multi-layer film structure, so that the carrier 401 does not need to rely on or use the substrate 301, the light guide plate 302 and the brightness enhancement film 303 to realize its multi-layer structure.

[0132] In this embodiment, the light guide sheet 302 can be spaced apart from or overlapped with the substrate 301. Similarly, the brightness enhancement film 303 can be spaced apart from or overlapped with the substrate 301.

[0133] When the light guide plate 302 and the brightness enhancement film 303 are spaced apart from the substrate 301 , the cost of scrapped consumables caused by poor yield or performance during packaging and lamination of the substrate 301 with the light guide plate 302 and the brightness enhancement film 303 can be reduced.

[0134] Since there are vacant areas 6 without diffused particles 402 on different setting layers of the carrier 401, and the carrier 401 is light-transmissive, the vacant areas 6 on the carrier 401 and adjacent setting layers can form incident paths and retroreflective paths for light to pass through in a non-diffusion form.

[0135] The non-diffusion here can be understood as that the light is not diffused by the diffusion particles 402, so that the propagation direction thereof does not change.

[0136] Since the diffusion particles 402 are gathered in the filling area 5 and no diffusion particles 402 are distributed in the vacant area 6 , light incident or emitted through the vacant area 6 will naturally not be diffused by the diffusion particles 402 .

[0137] Therefore, when the first light source 1 emits invisible light to the diffuser film 4, the intersection point of the extended line of the light emitting direction of the first light source 1 and the diffuser film 4, i.e., the incident point, is located on the vacant area 6. The intersection point of the light ① emitted by the first light source 1 and the diffuser film 4 when emitted through the incident path, i.e., the exit point, is also located on the vacant area 6.

[0138] After the invisible light emitted through the incident path is reflected by the finger, at least part of the reflected light ② can reach the light sensing element 2 through the retroreflection path. Similarly, the intersection point of the reflected light ② and the diffusion film 4, i.e., the incident point, is located on the vacant area 6, and the intersection point of the reflected light ② and the diffusion film 4, i.e., the exit point, is also located on the vacant area 6 when the reflected light ② is emitted through the retroreflection path.

[0139] It should be noted that, since the vacant areas 6 on the adjacent arrangement layers are staggered, the light that passes through the incident path and the retroreflection path in a non-diffusion form is inclined to the carrier 401 or the diffusion film 4. That is, the light that is incident on the diffusion film 4 in an oblique manner (including the light ① directly emitted by the first light source 1 and the light reflected by the finger ②) is likely to pass through the incident path in a non-diffusion form.

[0140] Therefore, the first light source 1 and the diffusion film 4 are arranged obliquely, so that as much light ① emitted by the first light source 1 as possible can pass through the incident path in a non-diffusion form.

[0141] Specifically, the light emitting direction of the first light source 1 forms a first preset angle α with the diffusion film 4 , and the first preset angle α is greater than 0° and less than 90°. That is, the light emitting direction of the first light source 1 is neither perpendicular nor parallel to the diffusion film 4 .

[0142] In this way, the light ① reaching the finger is also inclined, and the reflected light ② reflected by the finger is also incident on the diffusion film 4 at an angle. The reflected light ② forms a second preset angle β with the diffusion film 4, and the second preset angle β is greater than 0° and less than 90°. That is, the reflected light ② is neither perpendicular nor parallel to the diffusion film 4.

[0143] In this way, the first light source 1 arranged in an inclined manner with the diffusion film 4 can emit light ① toward the incident path. Light ① enters the incident path and exits the diffusion film 4 to reach the finger. After being reflected back by the finger, the reflected light ② carries the fingerprint information, and at least part of the reflected light ② enters the reflected path and exits the diffusion film 4 to reach the photosensitive element 2. Thus, the photosensitive element 2 realizes the recognition of fingerprint information.

[0144] The fingerprint recognition component of the embodiment of the present invention configures the diffusion film 4 of the embodiment of the present invention in the LCD display screen 3. The invisible light emitted by the first light source 1 at a specific angle can penetrate the LCD display screen 3 to reach the finger, and the light reflected by the finger can penetrate the LCD display screen 3 at a specific angle to reach the photosensitive element 2, thereby realizing under-screen fingerprint recognition.

[0145] The diffusion film 4 of the embodiment of the present invention can be used or configured in a fingerprint recognition component, and can be used in scenarios including but not limited to under-screen fingerprint unlocking, permission acquisition, identity authentication, etc.

[0146] Since the diffusion film 4 in the embodiment of the present invention is layered with the filling area 5 where the diffusion particles 402 are distributed, the vertically incident light can still be diffused by the diffusion particles 402 to achieve the purpose of uniform display. Therefore, with the help of the diffusion film 4 in the embodiment of the present invention, while making it possible to use the under-screen optical fingerprint in the LCD display screen 3, it does not affect its function of uniformly displaying the strength of the LCD display screen 3.

[0147] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0148] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the foregoing claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to be a waiver of such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A fingerprint recognition module with a diffusion membrane, characterized in that: The diffusion membrane comprises: A carrier, wherein the carrier has a plurality of arrangement layers along the thickness direction thereof, each of the arrangement layers being provided with a plurality of filling areas where diffusion particles are distributed and a plurality of vacant areas where diffusion particles are not distributed; wherein at least some areas of the filling areas on adjacent arrangement layers do not overlap; The fingerprint recognition component comprises: The diffusion film, wherein the carrier and the vacant area on the adjacent setting layer form an incident path for light to pass through in a non-diffusion form; A first light source located on one side of the diffusion film, wherein the light emitting direction of the first light source corresponds to the incident path; A light sensing element, which is located on the same side of the diffusion film as the first light source; The intersection of the extended line of the light emitting direction of the first light source and the diffusion film is located on the vacant area, and the intersection of the light emitted by the first light source and the diffusion film when emitted through the incident path is also located on the vacant area; The light emitting direction of the first light source forms a first preset angle with the diffusion film, and the first preset angle is greater than 0° and less than 90°.

2. The fingerprint recognition module with a diffusion film as claimed in claim 1, characterized in that: A projection of the filling area on any one of the setting layers toward another setting layer adjacent to the setting layer has at least a portion of the projection area located outside the range of the filling area on the other setting layer.

3. The fingerprint recognition module with a diffusion film as claimed in claim 1, characterized in that: The vacant area on any one of the setting layers corresponds to the filled area on another setting layer adjacent to the setting layer.

4. The fingerprint recognition module with a diffusion film as claimed in claim 1, characterized in that: The carrier is a single-layer structure, so that the carrier has two opposite surfaces, and the two surfaces respectively define two setting layers; or, The carrier is a multi-layer structure, so that the carrier has multiple surfaces, and the multiple surfaces respectively define multiple setting layers.

5. The fingerprint recognition module with a diffusion film as claimed in claim 1, characterized in that: The carrier and the vacant areas on the adjacent setting layer also form a retroreflective path through which light can pass without diffusion; at least part of the retroreflected light emitted by the first light source after being reflected by the finger reaches the light sensing element through the retroreflective path.

6. The fingerprint recognition module with a diffusion film as claimed in claim 5, characterized in that: The intersection point of the retroreflected light and the diffusion film is located on the empty area, and the intersection point of the retroreflected light and the diffusion film when emitted through the retroreflection path is also located on the empty area.

7. The fingerprint recognition module with a diffusion film as claimed in claim 5, characterized in that: The retroreflected light forms a second preset angle with the diffusion film, and the second preset angle is greater than 0° and less than 90°.

8. The fingerprint recognition module with a diffusion film as claimed in claim 1, characterized in that: The carrier includes a substrate having a first surface and a second surface opposite to each other, wherein the first surface and the second surface define a first setting layer and a second setting layer respectively.

9. The fingerprint recognition module with a diffusion film as claimed in claim 8, characterized in that: The first surface has a plurality of first filling areas where diffusion particles are distributed and a plurality of first vacant areas where diffusion particles are not distributed, and the second surface has a plurality of second filling areas where diffusion particles are distributed and a plurality of second vacant areas where diffusion particles are not distributed; A plurality of the first filling areas corresponds to a plurality of the second vacant areas, and a plurality of the second filling areas corresponds to a plurality of the first vacant areas.

10. The fingerprint recognition module with a diffusion film as claimed in claim 9, characterized in that: The plurality of first filling regions and the plurality of first vacant regions are arranged in a rectangular array, and the plurality of second filling regions and the plurality of second vacant regions are also arranged in a rectangular array.

11. The fingerprint recognition module with a diffusion film as claimed in claim 8, characterized in that: A light guide sheet is disposed on one side of the substrate close to the first light source, and a brightness enhancement film is disposed on the other side of the substrate away from the first light source; At least two of the substrate, the light guide plate and the brightness enhancement film constitute the carrier.

12. The fingerprint recognition module with a diffusion film as claimed in claim 11, characterized in that: The light guide plate has a third surface and a fourth surface facing each other, and the brightness enhancement film has a fifth surface and a sixth surface facing each other; The third surface and the fourth surface define a third setting layer and a fourth setting layer respectively, and the fifth surface and the sixth surface define a fifth setting layer and a sixth setting layer respectively; A plurality of filling regions in which diffusion particles are distributed and a plurality of vacant regions in which diffusion particles are not distributed are configured on at least two of the first to sixth setting layers.

13. The fingerprint recognition module with a diffusion film as claimed in claim 1, characterized in that: The first light source is a visible light source or an invisible light source.

14. The fingerprint recognition module with a diffusion film as claimed in claim 1, characterized in that: A reflective sheet is disposed on one side of the carrier close to the first light source, and the first light source is an invisible light source; The fingerprint recognition component further includes a second light source, which is disposed between the reflective sheet and the carrier; or, the second light source is disposed on a side of the carrier; The reflective sheet can allow the light emitted by the first light source to pass through, and the reflective sheet can reflect the light emitted by the second light source toward the diffusion film sheet.

15. The fingerprint recognition module with a diffusion film as claimed in claim 1, characterized in that: A display panel and a cover glass are disposed on the other side of the carrier away from the first light source, and the display panel is located between the cover glass and the carrier.

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