Display screens and electronic devices

Abstract

The embodiment of the present application provides a display screen and an electronic device, wherein the display screen includes: a stacked display panel, a circular polarizer, and a cover plate, wherein a fingerprint module is provided on the side of the display panel facing away from the circular polarizer; the reflected light emitted from the display panel toward the fingerprint module is elliptically polarized light, and the reflected light is light emitted from the display panel toward the circular polarizer and reflected by the object to be measured on the cover plate; the fingerprint module includes a fingerprint sensor, and a filter layer is provided on the surface of the fingerprint sensor facing the display panel, wherein the filter layer allows light of a first polarization direction in the elliptically polarized light to pass through so as to be projected onto the fingerprint sensor, and can filter part of the light emitted from the display panel toward the fingerprint module, wherein the first polarization direction is the major axis direction of the elliptically polarized light. This embodiment can filter part of the light leakage existing in the display panel to reduce the interference caused by the light leakage to the fingerprint module in recognizing the fingerprint pattern information.

Description

Technical Field

[0001] The present application relates to the technical field of electronic equipment, and in particular to a display screen and electronic equipment. Background Art

[0002] With the development of electronic devices, full screens have become a trend, and displays with fingerprint recognition are becoming increasingly popular in electronic devices.

[0003] Existing display screens usually hide an ultra-macro camera under the display screen. When the light-emitting side of the display screen substrate emits outgoing light, there is light leakage on the display screen substrate, that is, the part of the light emitted from the backlight side of the display screen substrate that is emitted toward the fingerprint module. The light leakage causes interference when the fingerprint module recognizes the fingerprint pattern information, reduces the overall signal-to-noise ratio and affects the display quality, thereby reducing the recognition accuracy of the fingerprint module. Summary of the invention

[0004] The embodiments of the present application provide a display screen and an electronic device to solve the technical problems of low image signal-to-noise ratio and low fingerprint module recognition accuracy caused by light leakage in the display screen in the related art.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a display screen, comprising: a stacked display panel, a circular polarizer, and a touch cover, wherein a fingerprint module is provided on a side of the display panel away from the circular polarizer;

[0007] The reflected light emitted from the display panel toward the fingerprint module is elliptically polarized light, and the reflected light is light emitted from the display panel toward the circular polarizer and reflected by the object to be measured on the cover plate;

[0008] The fingerprint module includes a fingerprint sensor. A filter layer is provided on the surface of the fingerprint sensor facing the display panel. The filter layer can allow light in a first polarization direction of the elliptically polarized light to pass through so as to be incident on the fingerprint sensor, and can filter part of the non-polarized light emitted by the display panel toward the fingerprint module. The first polarization direction is the long axis direction of the elliptically polarized light.

[0009] In a second aspect, an embodiment of the present application provides an electronic device, including the above-mentioned display screen.

[0010] In the embodiment of the present application, a filter layer is provided on the surface of the fingerprint sensor of the fingerprint module facing the display panel, and the filter layer allows light in the first polarization direction of the elliptically polarized light to pass through so as to be incident on the fingerprint sensor. The first polarization direction is the direction of the long axis of the elliptically polarized light. Since the light in the long axis direction of the elliptically polarized light accounts for a relatively large proportion, more light in the reflected light can be irradiated on the fingerprint sensor to satisfy fingerprint recognition. At the same time, the filter layer can filter part of the light emitted by the display panel toward the fingerprint module, that is, filter part of the leakage light in the display panel to reduce the interference caused by the leakage light to the fingerprint module in recognizing the fingerprint pattern information, thereby improving the overall signal-to-noise ratio to improve the display quality, thereby improving the accuracy of fingerprint recognition. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram showing a display screen provided in an embodiment of the present application;

[0012] Figure 2 A schematic diagram showing polarization transformation of reflected light in a display screen provided in an embodiment of the present application;

[0013] Figure 3 A schematic diagram showing a filter layer and a fingerprint sensor in a fingerprint module provided by an embodiment of the present application at a first viewing angle;

[0014] Figure 4 express Figure 3 A local enlarged schematic diagram of the middle A;

[0015] Figure 5 express Figure 4 Schematic diagram of the three-dimensional structure.

[0016] Reference numerals:

[0017] 10: display panel; 11: base glass; 12: light-emitting layer; 121: light-emitting pixel; 13: encapsulation glass; 20: circular polarizer; 21: quarter-wave plate; 22: linear polarizer; 30: touch cover; 40: fingerprint module; 41: filter layer; 411: rectangular hole; 42: fingerprint sensor; 421: receiving pixel; 43: lens assembly; 44: substrate; 50: object to be measured. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0020] In an embodiment of the present application, a display screen is provided, referring to Figures 1 to 5 , the display screen may specifically include: a stacked display panel 10, a circular polarizer 20 and a touch cover plate 30, a fingerprint module is provided on the side of the display panel 10 away from the circular polarizer 20; the reflected light emitted from the display panel 10 toward the fingerprint module 40 is elliptically polarized light, and the reflected light is the light emitted from the display panel 10 toward the circular polarizer 20 and reflected by the object to be measured 50 on the cover plate 30; the fingerprint module 40 includes a fingerprint sensor 42, and a filter layer 41 is provided on the surface of the fingerprint sensor 42 facing the display panel 10, and the filter layer 41 can allow the light of the first polarization direction in the elliptically polarized light to pass through to the fingerprint sensor 42, and can filter part of the light emitted by the display panel 10 toward the fingerprint module, and the first polarization direction is the long axis direction of the elliptically polarized light. It can be seen that this embodiment can filter part of the light leakage existing in the display panel to reduce the interference caused by the light leakage to the fingerprint module in identifying the fingerprint pattern information, improve the overall signal-to-noise ratio to improve the display quality, and thus improve the accuracy of fingerprint recognition.

[0021] Specifically, if Figure 1 As shown, the display screen may specifically include: a display panel 10, a circular polarizer 20 and a touch cover plate 30 which are stacked, that is, from bottom to top, the display panel 10, the circular polarizer 20 and the touch cover plate 30 are arranged in sequence. A fingerprint module 40 is provided on the side of the display panel 10 away from the circular polarizer 20, that is, the fingerprint module 40 is located on the lower side of the display panel 10. The surface of the touch cover plate 30 away from the circular polarizer 20 is used for the touch of the object to be measured 50, that is, the upper surface of the touch cover plate 30 is used for the touch of the object to be measured 50. In practice, the object to be measured 50 may be a finger or other object to be measured, and the following description will be made by taking the object to be measured 50 as a finger as an example.

[0022] Specifically, the display panel 10 can emit light, which is called outgoing light. The outgoing light is sequentially emitted through the circular polarizer 20 and the touch cover 30 to the finger, and then reflected by the finger to form light carrying fingerprint information, which is called reflected light. The reflected light is sequentially emitted through the touch cover 30, the circular polarizer 20, and the display panel 10 to the fingerprint sensor 42 of the fingerprint module, so that the fingerprint sensor 42 detects the light carrying fingerprint information. Figure 2As shown, the reflected light is polarized by the circular polarizer 20 (this process is Figure 2 After being polarized by the display panel 10 (the process is represented by E1), it becomes circularly polarized light. Figure 2 It is then transformed into elliptically polarized light (denoted by E2 in Fig.

[0023] Specifically, if Figure 1 As shown, a filter layer 41 is provided on the surface of the fingerprint sensor 42 facing the display panel 10, that is, a filter layer 41 is provided on the upper surface of the fingerprint sensor 42, and the filter layer 41 is used to allow light in a first polarization direction in the elliptically polarized light to pass through so as to be incident on the fingerprint sensor 42, so that the fingerprint sensor 42 detects the light carrying the fingerprint information, wherein the first polarization direction is the long axis direction of the elliptically polarized light, and since the light in the long axis direction of the elliptically polarized light accounts for a relatively large proportion, more light in the reflected light can be irradiated on the fingerprint sensor 42 to satisfy fingerprint recognition; at the same time, the filter layer 41 can also filter out the light emitted by the display panel 10 toward the fingerprint module 40, that is, filter out part of the leakage light existing in the display panel 10 to reduce the transmittance of the leakage light, improve the overall signal-to-noise ratio to improve the display quality, and thus improve the accuracy of fingerprint recognition.

[0024] In the embodiments of the present application, Figure 1 As shown, the fingerprint sensor 42 includes a plurality of receiving pixels 421; the filter layer 41 is made of a non-light-transmitting material, and the filter layer 41 is provided with a light-transmitting structure at a position opposite to each receiving pixel, and the light-transmitting structure includes a plurality of rectangular holes 411 arranged in an array; the first polarization direction is parallel to the long side of the rectangular hole 411, so that the light of the first polarization direction in the elliptically polarized light can pass through the rectangular hole 411.

[0025] Specifically, the fingerprint sensor 42 includes a plurality of receiving pixels 421, and the receiving pixels 421 can convert optical signals into electrical signals for imaging. Figures 3 to 5 As shown, the filter layer 41 is provided with a light-transmitting structure at a position opposite to each receiving pixel 421, and the light-transmitting structure includes a plurality of rectangular holes 411, and the plurality of rectangular holes 411 are arranged in an array. The array includes M rows and N columns, the M rows include a first preset number of rectangular holes 411, and the N columns include a second preset number of rectangular holes 411. It should be noted that Figure 3 Each dotted box in the middle filter layer corresponds to the corresponding receiving pixel 421. Figure 3 Only one light-transmitting structure is shown in the figure, but in practice, each dotted frame is provided with a light-transmitting structure.

[0026] Since the filter layer 41 is made of non-light-transmitting material, that is, if the reflected light shines on the area of ​​the filter layer 41 with material (non-rectangular hole 411), it cannot pass through the filter layer 41 to reach the fingerprint sensor 42. If the reflected light shines on the rectangular hole 411, it can pass through the rectangular hole 411 to reach the fingerprint sensor 42.

[0027] Specifically, if Figure 4 As shown, since the first polarization direction is parallel to the long side of the rectangular hole 411, that is, the long axis direction of the elliptically polarized light (direction E in the figure) is parallel to the long side of the rectangular hole 411, the light in the first polarization direction in the elliptically polarized light can pass through the rectangular hole 411 to be projected onto the fingerprint sensor 42, so that the fingerprint sensor 42 can detect the light carrying the fingerprint information more accurately.

[0028] Since the light emitted by the display panel 10 toward the fingerprint module 40 (referred to as leakage light) is non-polarized light, part of the light may hit the area with material on the filter layer 41 and be reflected back, and part of the light may hit the rectangular hole 411, but part of the light may hit the hole wall of the rectangular hole 411 and be refracted and / or reflected back, and only another part of the light can pass through the rectangular hole 411. Compared with the prior art, the filter layer 41 provided in this embodiment can filter out most of the leakage light to reduce the transmittance of the leakage light, improve the overall signal-to-noise ratio to improve the display quality, and thus improve the accuracy of fingerprint recognition.

[0029] In the embodiment of the present application, the elliptically polarized light also includes light in a second polarization direction, and the second polarization direction is the short axis direction of the elliptically polarized light; the second polarization direction is parallel to the short side of the rectangular hole, so that the light in the second polarization direction in the elliptically polarized light passes through the rectangular hole to be projected onto the fingerprint sensor 42.

[0030] Since the major axis and minor axis of the ellipse are perpendicular, and the major side and minor side of the rectangle are perpendicular, when the first polarization direction is parallel to the major side of the rectangular hole 411, the second polarization direction is parallel to the minor side of the rectangular hole 411, that is, the minor axis direction of the elliptically polarized light is parallel to the minor side of the rectangular hole 411, so that the light in the first polarization direction and the second polarization direction in the elliptically polarized light can pass through the rectangular hole 411 to the fingerprint sensor 42, further improving the transmittance of the elliptically polarized light through the rectangular hole, so that the fingerprint sensor 42 can detect the light carrying the fingerprint information more accurately.

[0031] Specifically, the material of the filter layer 41 can be silicon or aluminum, so that the filter layer 41 can be better combined with the fingerprint sensor 42. Of course, the specific material of the filter layer 41 can also be other metals, etc., which is not limited in this embodiment and can be selected according to actual conditions.

[0032] In the embodiments of the present application, Figure 4 and Figure 5 As shown, a plurality of rectangular holes 411 are arranged in a matrix.

[0033] Specifically, the number of rows and columns of the matrix is ​​the same, and the number of rectangular holes 411 included in each row and column is the same as the number of rows / columns. In this way, the rectangular holes 411 can be evenly distributed, so that the light of the first polarization direction in the elliptically polarized light can evenly pass through the filter layer 41, so as to further improve the accuracy of the fingerprint sensor 42 in identifying the fingerprint information.

[0034] In order to reduce the difficulty of manufacturing the filter layer 41, the number of rows and columns of the matrix can be two, and each row and each column includes two rectangular holes 411; or Figure 4 and Figure 5 As shown, the number of rows and columns of the matrix can be three, and each row and each column includes three rectangular holes 411; in addition, as shown in FIG. Figure 4 and Figure 5 As shown, the ratio of the first length to the second length is in the range of [1.2, 2], wherein the first length is the length of the long side of the rectangular hole 411, and the second length is the length of the short side of the rectangular hole 411. Of course, the specific arrangement of the matrix, that is, the specific arrangement of the plurality of rectangular holes 411, and the specific ratio of the first length to the second length are not limited in this embodiment, and are set according to actual conditions.

[0035] In addition, in order to increase the area of ​​the light-transmitting region of the filter layer 41, so as to increase the transmittance of the filter layer 41 and thereby improve the accuracy of the fingerprint sensor 42 in identifying fingerprint information, the ratio of the area of ​​each light-transmitting structure to the area of ​​the corresponding receiving pixel 421 is greater than or equal to 0.8, that is, the area of ​​a light-transmitting structure corresponding to a receiving pixel 421 accounts for greater than or equal to 80% of the area of ​​the receiving pixel 421.

[0036] In the embodiments of the present application, Figure 1 As shown, the display panel 10 includes a laminated base glass 11, a light-emitting layer 12 and an encapsulation glass 13, and the circular polarizer 20 includes a quarter-wave plate 21 and a linear polarizer 22; the quarter-wave plate 21 is arranged on the encapsulation glass 13, the linear polarizer 22 is arranged on the quarter-wave plate 21, the touch cover 30 is arranged on the linear polarizer 22, and the fingerprint module is arranged on the side of the base glass 11 away from the light-emitting layer 12, and there is a preset distance between the fingerprint module and the surface of the base glass 11 away from the light-emitting layer 12.

[0037] Specifically, if Figure 1As shown, the display panel 10 includes a laminated substrate glass 11, a light-emitting layer 12 and an encapsulation glass 13, wherein the light-emitting layer 12 is composed of a plurality of light-emitting pixels 121, and the light-emitting pixels 121 serve as the light source of the display panel 10 and emit light upward.

[0038] Specifically, if Figure 1 As shown, from bottom to top, the display screen is composed of the fingerprint module, the base glass 11, the light emitting layer 12, the encapsulation glass 13, the quarter wave plate 21, the linear polarizer 22 and the touch cover 30. In order to allow more light emitted upward by the light emitting pixel 121 to irradiate the encapsulation glass 13, the light emitting layer 12 and the surface of the encapsulation glass 13 facing the base glass 11 ( Figure 1 A certain distance is set between the fingerprint module and the surface of the substrate glass 11 away from the light-emitting layer 12 ( Figure 1 There is a preset distance between the fingerprint sensor 42 and the lower surface shown in the figure, so that more reflected light can be irradiated onto the fingerprint sensor 42 of the fingerprint module, thereby improving the accuracy of the fingerprint sensor 42 in identifying the fingerprint information.

[0039] It is worth noting that a quarter wave plate (1 / 4 wave plate) is a birefringent single crystal wave plate of a certain thickness, also known as a phase delay plate. When a certain wavelength of light is incident vertically on the 1 / 4 wave plate, the 1 / 4 wave plate can produce a λ / 4 optical path difference (i.e., π / 2 phase difference) between the outgoing ordinary light (o light) and the extraordinary light (e light). When linearly polarized light is incident vertically on the 1 / 4 wave plate, the angle between the polarization direction of the linearly polarized light and the optical axis direction of the 1 / 4 wave plate is θ. When θ=45°, the outgoing light is circularly polarized light; when θ≠45°, the outgoing light is elliptically polarized light; among them, linearly polarized light can be decomposed into o light and e light with perpendicular vibration directions. The vibration direction of o light is perpendicular to the incident plane, that is, perpendicular to the optical axis; the vibration direction of e light is parallel to the incident plane, that is, parallel to the optical axis.

[0040] In this embodiment, when the reflected light passes through the linear polarizer, it becomes linear polarized light, and when the linear polarized light passes through the quarter wave plate 21, it becomes circular polarized light. Since there is a gap between the encapsulation glass 13 and the base glass 11, when the circularly polarized light passes through the encapsulation glass 13 and irradiates the base glass 11, the ordinary light (o light) and extraordinary light (e light) incident on the circularly polarized light will be reflected. Since there will be reflection loss between the o light and the e light, and the reflection instant is different, they will become elliptically polarized light after passing through the base glass 11.

[0041] In practice, the fingerprint module further includes a lens assembly 43 and a substrate 44. From top to bottom, the lens assembly 43, the fingerprint sensor 42 and the substrate 44 are arranged in sequence. The light of the first polarization direction in the elliptically polarized light is first irradiated onto the lens assembly 43, and the lens assembly 43 is used to image the emitted light with fingerprint information onto the fingerprint sensor 42 for fingerprint detection and / or fingerprint recognition.

[0042] It should be noted that the up and down described in the figure are only described in the direction of the diagram and do not represent the actual orientation.

[0043] The display screen provided in the embodiment of the present application has the following advantages:

[0044] In the embodiment of the present application, the display screen includes a stacked display panel 10, a circular polarizer 20 and a touch cover 30, and a fingerprint module is provided on the side of the display panel 10 away from the circular polarizer 20; the reflected light emitted from the display panel 10 toward the fingerprint module 40 is elliptically polarized light, and the reflected light is the light emitted from the display panel 10 toward the circular polarizer 20 and reflected by the object to be measured 50 on the cover 30; the fingerprint module 40 includes a fingerprint sensor 42, and a filter layer 41 is provided on the surface of the fingerprint sensor 42 facing the display panel 10, and the filter layer 41 can allow the light of the first polarization direction in the elliptically polarized light to pass through to the fingerprint sensor 42, and can filter part of the light emitted by the display panel 10 toward the fingerprint module, and the first polarization direction is the long axis direction of the elliptically polarized light. It can be seen that this embodiment can filter part of the light leakage existing in the display panel to reduce the interference caused by the light leakage to the fingerprint module in identifying the fingerprint pattern information, improve the overall signal-to-noise ratio to improve the display quality, and thus improve the accuracy of fingerprint recognition.

[0045] An embodiment of the present application also provides an electronic device, which may specifically include the above-mentioned display screen.

[0046] Specifically, in the embodiments of the present application, the electronic device includes but is not limited to a mobile phone, a tablet computer, a laptop computer, a PDA, a vehicle-mounted terminal, a wearable device, and a pedometer, etc. The electronic device includes the above-mentioned display screen.

[0047] It should be noted that the reflected light formed by the finger can carry not only fingerprint information, but also pulse, blood oxygen, rest and other biological signs information. That is to say, the fingerprint sensor of this embodiment can detect other biological signs information such as pulse, blood oxygen, rest and other biological signs information in addition to fingerprint detection, so as to perform other functions such as liveness detection and human health detection, thus enriching the functions of electronic equipment.

[0048] The advantages of the electronic device are the same as those of the display screen, which will not be described in detail here.

[0049] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0050] Although the optional embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including optional embodiments and all changes and modifications that fall within the scope of the present application.

[0051] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the existence of other identical elements in the article or terminal device including the elements. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0052] The technical solution provided by the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. At the same time, for those skilled in the art, according to the principles and implementation methods of the present application, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A display screen, characterized in that: include: A display panel, a circular polarizer and a touch cover plate are stacked, wherein a fingerprint module is provided on a side of the display panel facing away from the circular polarizer; The reflected light emitted from the display panel toward the fingerprint module is elliptically polarized light, and the reflected light is light emitted from the display panel toward the circular polarizer and reflected by the object to be measured on the cover plate; The fingerprint module includes a fingerprint sensor, and a filter layer is provided on the surface of the fingerprint sensor facing the display panel, the filter layer can allow light in a first polarization direction of the elliptically polarized light to pass through so as to be emitted to the fingerprint sensor, and can filter part of the light emitted by the display panel toward the fingerprint module, the first polarization direction being the long axis direction of the elliptically polarized light; The fingerprint sensor includes a plurality of receiving pixels; The filter layer is made of a non-light-transmitting material, and a light-transmitting structure is provided at a position of the filter layer opposite to each of the receiving pixels, wherein the light-transmitting structure includes a plurality of rectangular holes arranged in an array; The first polarization direction is parallel to the long side of the rectangular hole, so that the light with the first polarization direction in the elliptically polarized light passes through the rectangular hole.

2. The display screen according to claim 1, characterized in that: The elliptically polarized light also includes light in a second polarization direction, and the second polarization direction is the short axis direction of the elliptically polarized light; The second polarization direction is parallel to the short side of the rectangular hole, so that the light of the second polarization direction in the elliptically polarized light passes through the rectangular hole to be emitted onto the fingerprint sensor.

3. The display screen according to claim 1, characterized in that: The plurality of rectangular holes are arranged in a matrix.

4. The display screen according to claim 3, characterized in that: The number of rows and columns of the matrix is ​​two, and each row and each column includes two rectangular holes respectively; or, The number of rows and columns of the matrix is ​​three, and each row and each column includes three rectangular holes respectively.

5. The display screen according to claim 1 or 4, characterized in that: The ratio range of the first length to the second length is [1.2, 2], the first length is the length of the long side of the rectangular hole, and the second length is the length of the short side of the rectangular hole.

6. The display screen according to claim 1, characterized in that: The ratio of the area of ​​each of the light-transmitting structures to the area of ​​the corresponding receiving pixel is greater than or equal to 0.

8.

7. The display screen according to claim 1, characterized in that: The filter layer is made of silicon or aluminum.

8. The display screen according to claim 1, characterized in that: The display panel includes a laminated substrate glass, a light-emitting layer and an encapsulation glass, and the circular polarizer includes a quarter-wave plate and a linear polarizer; The quarter wave plate is arranged on the packaging glass, the linear polarizer is arranged on the quarter wave plate, the cover plate is arranged on the linear polarizer, and the fingerprint module is arranged on the side of the base glass away from the light-emitting layer, and there is a preset distance between the fingerprint module and the surface of the base glass away from the light-emitting layer.

9. An electronic device, characterized in that: A display screen comprising any one of claims 1 to 8.

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