Polarizer, polarizing module, display panel and electronic equipment

Abstract

The utility model provides a polaroid, a polarization module, a display panel and electronic equipment, and relates to the technical field of biological recognition, the polaroid is provided with a circular polarization area and a non-circular polarization area, first light emitted by a light emitting module is emitted into circular polarization light through the circular polarization area, and second light emitted by the non-circular polarization area is emitted into non-circular polarization light through the non-circular polarization area. The second light emitted by the light-emitting module is emitted through the non-circular polarized light area to form non-circular polarized light capable of being reflected by a target object to form recognition light, so that the light emitted from the polaroid can relieve discomfort of eyes of a user in the using process, and the recognition light reflected by the target object can smoothly penetrate through the polaroid. And the optical acquisition module under the screen receives the signals.

Description

Technical Field

[0001] The present application relates to the field of biometric identification technology, and in particular to a polarizer, a polarizing module, a display panel and an electronic device. Background Art

[0002] With the development of science and technology, electronic devices with display functions have penetrated into every corner of daily life. In order to optimize the safety and convenience of user use, fingerprint modules are gradually integrated under the display panels of electronic devices. They receive, record and analyze light carrying fingerprint features to confirm and identify the target object to which the fingerprint features belong. Various functions have been derived from this, which not only enriches the user experience, but also increases the time users use electronic devices.

[0003] During long-term use, it is easy to cause discomfort to the user's eyes, so circular polarized eye protection screens are introduced to alleviate this problem. However, the principle of circular polarized eye protection screens is to use circular polarizers to convert the originally emitted linear polarized light into circular polarized light. Since circular polarized light is closer to natural light, it can protect the eyes.

[0004] However, during the research and development process, it was discovered that circularly polarized light will experience half-wave loss after being reflected by the finger, causing its polarization state to change. As a result, the circularly polarized light is difficult to pass through the circular polarizer after being reflected by the finger, resulting in the identification light being unable to be successfully received and imaged by the fingerprint module under the screen. Utility Model Content

[0005] The purpose of the present application is to provide a polarizer, a polarizing module, a display panel and an electronic device to address the deficiencies in the above-mentioned prior art.

[0006] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0007] In one aspect of an embodiment of the present application, a polarizer is provided, which is used to be configured on the light-emitting side of a light-emitting module. The polarizer has a circular polarization region and a non-circular polarization region. A first light ray emitted by the light-emitting module is emitted as circularly polarized light through the circular polarization region. A second light ray emitted by the light-emitting module is emitted as non-circularly polarized light through the non-circular polarization region. The second light ray emitted by the light-emitting module is emitted as non-circularly polarized light that can be reflected by a target object to form an identification light. At least part of the identification light passes through the polarizer and then is emitted toward the light-emitting module side.

[0008] Optionally, a hollow structure is provided on the polarizer, the hollow structure forms a non-circular polarization area, and the second light is emitted through the hollow structure as non-circular polarized light.

[0009] Optionally, the hollow structure is a light-transmitting hole and / or a light-transmitting through groove.

[0010] Optionally, the hollow structure is a light-transmitting hole, and the aperture of the light-transmitting hole is less than or equal to 2 cm;

[0011] Or; the hollow structure is a light-transmitting through groove, and the groove width of the light-transmitting through groove is less than or equal to 2 cm.

[0012] Optionally, the polarizer is configured on a side of the light emitting module away from the optical collection module, and the non-circular polarization area covers the orthographic projection area of ​​the optical collection module on the polarizer.

[0013] Optionally, the hollow structure is a light-transmitting hole, the aperture of the light-transmitting hole ranges from 1 um to 100 um, and the number of the light-transmitting holes is multiple.

[0014] Optionally, a plurality of light-transmitting holes are discretely distributed on the polarizer.

[0015] Optionally, a filling layer is filled in the hollow structure, and the filling layer is a non-polarizing light-transmitting layer or a first 1 / 2 wave plate.

[0016] Optionally, the filling layer is a first 1 / 2 wave plate, and the angle between the fast axis direction of the first 1 / 2 wave plate and the polarization direction of the polarized light incident on the first 1 / 2 wave plate is 0 degree or 45 degrees.

[0017] Optionally, the polarizer includes a linear polarizer and a first quarter wave plate which are sequentially arranged along the light emitting direction of the light emitting module, and the hollow structure is located in the first quarter wave plate.

[0018] Optionally, the polarizer further includes a second 1 / 2 wave plate, and the second 1 / 2 wave plate is located on a side of the first 1 / 4 wave plate facing away from the linear polarizer.

[0019] In another aspect of an embodiment of the present application, a polarizing module is provided, comprising a second quarter wave plate and any one of the above-mentioned polarizing plates, wherein the second quarter wave plate is located between the polarizing plate and the light-emitting module.

[0020] According to another aspect of an embodiment of the present application, a display panel is provided, comprising a light-emitting module and any one of the above-mentioned polarizers, wherein the polarizer is located on a light-emitting side of the light-emitting module.

[0021] In another aspect of an embodiment of the present application, a display panel is provided, comprising a light-emitting module and any one of the above-mentioned polarizing modules, wherein the polarizing module is located at a light-emitting side of the light-emitting module.

[0022] According to another aspect of the embodiments of the present application, an electronic device is provided, comprising an optical collection module and any one of the above-mentioned display panels, wherein the display panel comprises a light-emitting module and a polarizing module, and the optical collection module is located on a side of the light-emitting module away from the polarizing module, and the optical collection module is used to receive at least part of the identification light after passing through the polarizing module.

[0023] According to another aspect of the embodiments of the present application, an electronic device is provided, comprising an optical collection module and any one of the above-mentioned display panels, wherein the display panel comprises a light-emitting module and a polarizer, and the optical collection module is located on a side of the light-emitting module away from the polarizer, and the optical collection module is used to receive at least part of the identification light after passing through the polarizer.

[0024] The beneficial effects of this application include:

[0025] The present application provides a polarizer, a polarizing module, a display panel and an electronic device, wherein the polarizer has a circular polarization region and a non-circular polarization region, the first light emitted by the light-emitting module is emitted as circularly polarized light through the circular polarization region, and the second light emitted by the light-emitting module is emitted as non-circularly polarized light through the non-circular polarization region, which can be reflected by a target object to form an identification light. In this way, the light emitted from the polarizer can not only alleviate the discomfort caused by the user's eyes during use, but also enable the identification light reflected by the target object to pass through the polarizer smoothly, and then be received by the optical collection module under the screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the structure of a circular polarized eye protection screen provided by the prior art;

[0028] Figure 2 A schematic diagram of the structure of a display panel provided in an embodiment of the present application;

[0029] Figure 3 A top view of a polarizer provided in an embodiment of the present application;

[0030] Figure 4 A top view of another polarizer provided in an embodiment of the present application;

[0031] Figure 5 A top view of another polarizer provided in an embodiment of the present application;

[0032] Figure 6 A schematic diagram of the structure of another display panel provided in an embodiment of the present application;

[0033] Figure 7 A schematic diagram of the structure of another display panel provided in an embodiment of the present application.

[0034] Icons: 12- linear polarizer; 13- 1 / 4 wave plate; 14- finger; 201- first light; 202- second light; 203- non-circularly polarized light; 204- identification light; 11, 210- light-emitting module; 220- polarizer; 221- circularly polarized area; 222- non-circularly polarized area; 223- first 1 / 4 wave plate; 224- first linear polarizer; 225- hollow structure; 230- second 1 / 4 wave plate. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings 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. It should be noted that, in the absence of conflict, the various features in the embodiments of the present application can be combined with each other, and the combined embodiments are still within the scope of protection of the present application.

[0036] In the description of this application, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the product of the application is usually placed when in use, and are only for the convenience of describing this application and simplifying the description, and therefore cannot be understood as limiting this application. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions and cannot be understood as indicating or implying relative importance.

[0037] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] Figure 1 A schematic diagram of the structure of a circular polarized eye protection screen provided by the prior art. Figure 1, the circular polarized eye protection screen includes a light emitting module 11, a linear polarizer 12 and a quarter wave plate 13 in sequence, and the absolute value of the angle between the polarization direction of the linear polarizer 12 and the fast axis of the quarter wave plate 13 is 45 degrees. Among them, the natural light emitted by the light emitting module 11 is emitted through the linear polarizer 12 and the quarter wave plate 13 in sequence and received by the human eye. In this process, the natural light becomes linear polarized light after passing through the linear polarizer 12, and the linear polarized light becomes circular polarized light after passing through the quarter wave plate 13. Since circular polarized light is closer to natural light than linear polarized light, it can alleviate the discomfort of the user's eyes during use.

[0039] Figure 1 Although the circularly polarized eye protection screen shown can alleviate the user's eye discomfort during use, it will block the circularly polarized light reflected by the finger 14, thereby affecting the reception of this part of light by the fingerprint module under the screen. The main reason is that part of the circularly polarized light emitted by the 1 / 4 wave plate 13 is used for fingerprint recognition, that is, part of the circularly polarized light emitted by the 1 / 4 wave plate 13 will be reflected by the finger 14 and will cause half-wave loss, thereby changing the rotation direction of the circularly polarized light, such as Figure 1 In the figure, the circularly polarized light emitted from the 1 / 4 wave plate 13 is right-handed circularly polarized light before entering the finger 14. After being reflected by the finger 14, half-wave loss occurs, and the reflected light becomes left-handed circularly polarized light. The left-handed circularly polarized light becomes linearly polarized light after passing through the 1 / 4 wave plate 13, but the polarization direction of the linear polarized light at this time is perpendicular to the polarization direction of the linear polarizer 12. Therefore, the linear polarized light is blocked by the linear polarizer 12 and is difficult to be received by the fingerprint module under the light-emitting module 11, resulting in the failure of the fingerprint recognition function.

[0040] Based on the problems existing in the circular polarized eye protection screen, the present application provides a polarizer that can improve the above problems. For ease of understanding, it is applied to a display panel for demonstration. Figure 2 A schematic diagram of the structure of a display panel provided in an embodiment of the present application. Figure 2 The polarizer 220 is located on the light-emitting side of the light-emitting module 210, so that the polarizer 220 can adjust the light emitted by the light-emitting module 210, so that the light emitted by the polarizer 220 can, on the one hand, alleviate the discomfort caused by the user's eyes during use, and on the other hand, it can also allow the identification light 204 reflected by the target object to pass through the polarizer 220 and then be received by the optical collection module under the screen.

[0041] The target object includes but is not limited to the finger 14, the palm, the human eye, etc., so the light reflected by the target object carries the biometric information of the target object, and is therefore referred to as the identification light 204. Correspondingly, the biometric information may be fingerprint feature information, palm print feature information, finger vein feature information, iris feature information, etc. depending on the target object.

[0042] Please continue to refer to Figure 2 The polarizer 220 may have a circular polarization region 221 and a non-circular polarization region 222, so that different regions have different light adjustment capabilities. In order to more intuitively understand the relationship between the circular polarization region 221 and the non-circular polarization region 222 formed on the polarizer 220, Figure 3 A top view of a polarizer provided in an embodiment of the present application, Figure 4 A top view of another polarizer provided in an embodiment of the present application, Figure 5 A top view of another polarizer provided in an embodiment of the present application. Figure 3 , Figure 4 or Figure 5 It can be seen that in a top view, the entire plane of the polarizer 220 has at least two different types of regions, namely, a circular polarization region 221 and a non-circular polarization region 222 .

[0043] Please continue to refer to Figure 2 In this way, the polarizer 220 can make different adjustments to the light emitted by the light-emitting module 210 through the circular polarization area 221 and the non-circular polarization area 222, so that the light emitted through the circular polarization area 221 can alleviate the discomfort caused by the user's eyes during use, while the light emitted through the non-circular polarization area 222 can be reflected by the target object and pass through the polarizer 220 to be used for identifying the target object.

[0044] Specifically, Figure 2 As shown, for ease of distinction and understanding, the light emitted by the light-emitting module 210 is divided according to the different areas incident on the polarizer 220, for example, the light incident on the circularly polarized area 221 is taken as the first light 201, and the light incident on the non-circularly polarized area 222 is taken as the second light 202.

[0045] Continue to refer to Figure 2, to introduce the optical paths of the first light 201 and the second light 202 respectively, wherein, for the first light 201: the first light 201 emitted by the light-emitting module 210 is incident on the circularly polarized area 221, thereby, it is adjusted to circularly polarized light by the circularly polarized area 221 and then emitted from the polarizer 220, and then received by the user's eyes, using the characteristics of circularly polarized light that is closer to natural light to alleviate the discomfort caused by the user during use. For the second light 202: the second light 202 emitted by the light-emitting module 210 is incident on the non-circular polarization area 222. At this time, the second light 202 is adjusted to the non-circular polarized light 203 by the non-circular polarization area 222 and then emitted. The non-circular polarized light 203 is incident on the target object, and then reflected by the target object to form the identification light 204 carrying the biometric information of the target object. Based on the characteristics of the non-circular polarized light 203, at least part of the identification light 204 can smoothly pass through the polarizer and be emitted in the direction of one side of the light-emitting module 210, so as to be conveniently received by the optical collection module under the display panel.

[0046] When the identification light 204 formed after being reflected by the target object passes through the polarizer 220, the following situations may occur: first, the identification light 204 formed after being reflected by the target object can pass through the polarizer 220 from the non-circular polarization area 222, and then pass through the light-emitting module 210 to the bottom of the display panel; second, the identification light 204 formed after being reflected by the target object can pass through the polarizer 220 from the circular polarization area 221, and then pass through the light-emitting module 210 to the bottom of the display panel; third, a part of the identification light 204 formed after being reflected by the target object can pass through the polarizer 220 from the non-circular polarization area 222, and another part of the identification light 204 can also pass through the polarizer 220 from the circular polarization area 221, so that the identification light 204 passing through the circular polarization area 221 and the non-circular polarization area 222 can pass through the light-emitting module 210 to the bottom of the display panel.

[0047] Reference Figure 3 , Figure 4 or Figure 5 It can be seen that when the circular polarization region 221 and the non-circular polarization region 222 are formed on the polarizer 220 , in order to alleviate the discomfort caused by the user's eyes during use, the area of ​​the circular polarization region 221 can be made larger than the non-circular polarization region 222 .

[0048] When the non-circular polarization area 222 is specifically set, the non-circular polarization area 222 can be made to correspond to the recognition area of ​​the display panel, so that the non-circular polarization light 203 emitted from the non-circular polarization area 222 can be used for the recognition of the target. Of course, the correspondence between the two at least includes that the area of ​​the non-circular polarization area 222 is greater than, equal to, or less than the area of ​​the recognition area of ​​the display panel. It should be known that the recognition area of ​​the display panel should correspond to the optical collection module below the display panel, for example, the positive projection area of ​​the optical collection module on the display panel along the thickness direction of the display panel should be the same or approximately the same as the recognition area.

[0049] In order to construct the non-circular polarization region 222 on the polarizer 220, a hollow structure 225 may be provided on the polarizer 220, so that the polarizer 220 at the location of the hollow structure 225 has a light adjustment capability different from that at the location of the non-hollow structure 225. In this way, the location of the hollow structure 225 can be used as the aforementioned non-circular polarization region 222, so that the second light 202 is emitted as non-circular polarized light 203 through the hollow structure 225. It should be understood that the hollow structure 225 on the polarizer 220 herein can be a method of completely penetrating along the thickness direction of the polarizer 220, or a method of not penetrating along the thickness direction of the polarizer 220 (i.e., the depth of the hollow structure 225 is less than the thickness of the polarizer 220).

[0050] In some possible implementations, the hollow structure 225 may be a light-transmitting hole and / or a light-transmitting through groove.

[0051] The non-circular polarization region 222 may be arranged in at least the following ways:

[0052] Example 1

[0053] Please refer to Figure 3 or Figure 4 When the non-circular polarization area 222 is formed on the polarizer 220, the non-circular polarization area 222 can be a larger area, such as an area of ​​square centimeters, so that the emitted non-circular polarization light 203 is more concentrated, which is convenient for corresponding to the identification area in the display panel.

[0054] Since the non-circular polarization region 222 is formed by the hollow structure 225, the specific form of the hollow structure 225 can be a light-transmitting hole or a light-transmitting groove, such as Figure 3 In the embodiment, the hollow structure 225 can be a whole large light-transmitting hole; or Figure 4 As shown, the hollow structure 225 can be a whole large light-transmitting through groove. When the hollow structure 225 is a light-transmitting through groove, the process difficulty can be effectively reduced.

[0055] Of course, in an embodiment not shown in the figure, the number of the non-circular polarization regions 222 can also be two or more. In this case, the number of the hollow structures 225 is consistent therewith, that is, the number of the hollow structures 225 can also be two or more.

[0056] In some possible implementations of this example, the diameter of the light-transmitting hole is less than or equal to 2 cm.

[0057] In some possible implementations of this example, the width of the light-transmitting through slot may be less than or equal to 2 cm, for example Figure 4 In the embodiment, the distance W between the two opposite side walls of the light-transmitting through groove is taken as the groove width, which is less than or equal to 2 cm.

[0058] In some possible implementations of this example, the polarizer and the optical collection module can be located on opposite sides of the light-emitting module, and of course the polarizer meets the requirement of being located on the light-emitting side of the light-emitting module. In order to better facilitate the identification of the optical light that passes through the display panel smoothly and is received by the optical collection module, the non-circular polarization area can cover the positive projection area of ​​the optical collection module on the polarizer.

[0059] Example 2

[0060] Please refer to Figure 5 When the non-circular polarization area 222 is formed on the polarizer 220, the non-circular polarization area 222 can be a plurality of dispersed smaller areas, each of which is, for example, an area at the level of square micrometers, so that the positions on the polarizer 220 that can emit the non-circular polarized light 203 are relatively dispersed. In this way, when the position of the recognition area of ​​the display panel changes, the polarizer 220 can emit the non-circular polarized light 203 at its multiple positions, so that the recognition area after the position change can also have the non-circular polarized light 203 that can be used for target object recognition, so that the polarizer 220 can be compatible with a variety of display panels with different recognition area positions. Of course, when the recognition area in the display panel is wide (such as half-screen recognition or full-screen recognition), this kind of polarizer 220 can also meet the target object recognition while alleviating the problem that the non-circular polarized light 203 may cause discomfort to the user's eyes.

[0061] Since the non-circular polarization region 222 is formed by the hollow structure 225, the specific form of the hollow structure 225 can be a light-transmitting hole and / or a light-transmitting groove, such as Figure 5 In the embodiment, the hollow structure 225 can be a plurality of dispersed light-transmitting holes. The plurality of light-transmitting holes can be arranged in a regular or irregular manner (such as discrete distribution), and the apertures of the plurality of light-transmitting holes can be equal or unequal, and the present application does not impose any specific restrictions on them.

[0062] Of course, in an embodiment not shown in the figure, the hollow structure 225 can be a plurality of dispersed light-transmitting through grooves, for example, arranged in sequence along the width or length direction of the polarizer 220 at intervals.

[0063] In this embodiment, the polarizer 220 may have both light-transmitting holes and light-transmitting grooves.

[0064] In some possible implementations of this example, the aperture of the light-transmitting hole ranges from 1um to 100um. When there are light-transmitting holes with different apertures among the multiple light-transmitting holes, the aperture of the larger light-transmitting hole ranges from 5um to 50um, and the aperture of the smaller light-transmitting hole ranges from 1um to 10um.

[0065] In some possible implementations of this example, the spacing between the two opposite side walls of the light-transmitting through groove ranges from 1um to 100um. When there are light-transmitting through grooves with unequal spacing between the two opposite side walls among the plurality of light-transmitting through grooves, the spacing between the two opposite side walls of the larger light-transmitting through groove ranges from 5um to 50um, and the spacing between the two opposite side walls of the smaller light-transmitting through groove ranges from 1um to 10um.

[0066] It should be understood that the present application does not limit the shape of the aforementioned light-transmitting hole. Figure 3 or Figure 5 In the embodiment, the shape of the light-transmitting hole is circular, and may also be elliptical, polygonal, or irregular. Of course, the present application does not limit the shape of the through slot, and may be rectangular or arc-shaped, for example. In addition, the through slot may be opened along the width or length direction of the polarizer and penetrate the width or length direction of the polarizer, or may not penetrate the width or length direction of the polarizer.

[0067] In some possible implementations, Figure 6 This is a schematic diagram of the structure of another display panel provided in an embodiment of the present application. Figure 6 The polarizer 220 includes a stacked linear polarizer (for ease of use with Figure 1 The linear polarizer 12 in the present application is distinguished from the existing linear polarizer 12, and the linear polarizer in the present application is referred to as the first linear polarizer 224) and the first 1 / 4 wave plate 223, and the first linear polarizer 224 and the first 1 / 4 wave plate 223 are arranged in sequence along the light emitting direction of the light emitting module 210. Among them, the hollow structure 225 is located in the first 1 / 4 wave plate 223, and the hollow structure 225 runs through the first 1 / 4 wave plate 223, so that the first light 201 needs to pass through the first linear polarizer 224 and the first 1 / 4 wave plate 223 in sequence, and the second light 202 is directly emitted through the hollow structure 225 of the first 1 / 4 wave plate 223 after passing through the first linear polarizer 224. Therefore, the second light 202 is not adjusted by the first 1 / 4 wave plate 223, so that the adjustment ability of the polarizer 220 at the hollow structure 225 is different from that at the non-hollow structure 225.

[0068] Please refer to Figure 6 After the light emitting module 210 emits the second light 202, it is first adjusted to linear polarized light by the first linear polarizer 224, and then the linear polarized light is emitted through the hollow structure 225 of the first 1 / 4 wave plate 223 to form the aforementioned non-circular polarized light 203. The linear polarized light emitted from the hollow structure 225 is reflected by the finger 14 to form the aforementioned identification light 204. At this time, the identification light 204 still maintains the linear polarization state unchanged, and the polarization direction is still the same as the first linear polarizer 224.

[0069] If the identification light 204 passes through the polarizer 220 via the aforementioned non-circular polarization region: Figure 6 The identification light 204 on the left side first passes through the hollow structure 225 of the first 1 / 4 wave plate 223, and its polarization state and polarization direction remain unchanged. Therefore, the identification light 204 can smoothly pass through the first linear polarizer 224 and then be emitted toward the light-emitting module 210.

[0070] When the identification light 204 passes through the polarizer 220 via the aforementioned circular polarization region: Figure 6 The identification light 204 located on the right side first passes through the non-hollow structure 225 of the first 1 / 4 wave plate 223. Therefore, the linear polarization state of the identification light 204 is adjusted to a circular polarization state by the first 1 / 4 wave plate 223, and then becomes a linear polarization state after passing through the first linear polarizing plate 224, and then is emitted toward the light-emitting module 210.

[0071] In some possible implementations, the hollow structure 225 may not be filled so as to maintain a hollow state.

[0072] In some possible implementations, the hollow structure 225 may be filled with a filling layer, so that the surface of the polarizer can be relatively flat.

[0073] In some possible implementations, the filling layer is a non-polarized light-transmitting layer, that is, when the light passes through the non-polarized light-transmitting layer, the polarization state and polarization direction of the light are not changed.

[0074] In some possible embodiments, the filling layer is a first 1 / 2 wave plate, so that when the linearly polarized light emitted by the first linear polarizer 224 passes through the first 1 / 2 wave plate, the first 1 / 2 wave plate only changes its polarization direction. Specifically, if the fast axis direction of the first 1 / 2 wave plate has an angle with the polarization direction of the polarized light incident on the first 1 / 2 wave plate, the polarization direction of the linearly polarized light emitted from the first 1 / 2 wave plate changes by 2 times of the angle.

[0075] In some possible embodiments, if the filling layer is a first 1 / 2 wave plate, the angle between the fast axis direction of the first 1 / 2 wave plate and the polarization direction of the polarized light incident on the first 1 / 2 wave plate can be made to be 0 degrees or 45 degrees. In other words, the angle between the fast axis direction of the first 1 / 2 wave plate and the polarization direction of the first linear polarizer 224 is 0 degrees or 45 degrees, which can reduce the light loss of the identification light 204 when passing through the polarizer 220.

[0076] In some possible implementations, the first quarter wave plate 223 may be a wide-band compensation film.

[0077] In some possible embodiments, the polarizer 220 further includes a second 1 / 2 wave plate, which is located on the side of the first 1 / 4 wave plate 223 away from the first linear polarizer 224, and through the coordinated use of the second 1 / 2 wave plate and the first 1 / 4 wave plate 223, a wide-band compensation effect can be achieved.

[0078] In another aspect of an embodiment of the present application, a polarizing module is provided, comprising a second quarter wave plate and any one of the above-mentioned polarizing plates, wherein the second quarter wave plate is located between the polarizing plate and the light-emitting module. Figure 7 A schematic diagram of the structure of another display panel provided in an embodiment of the present application. Figure 7 , the polarizing module further includes a second quarter wave plate 230, which is located on the side of the first linear polarizing plate 224 away from the first quarter wave plate 223. In this way, the cooperation between the second quarter wave plate 230 and the first linear polarizing plate 224 can prevent ambient light from being reflected by the display panel and entering the user's eyes. And when the second quarter wave plate 230 is provided, if the identification light 204 passes through the polarizing plate 220 via the aforementioned non-circular polarization area: Figure 7 The identification light 204 on the left side of the image passes through the first linear polarizer 224 and then becomes circularly polarized light after passing through the second quarter wave plate 230, and then is emitted toward the light emitting module 210. If the identification light 204 passes through the polarizer 220 via the aforementioned circular polarization area: Figure 7 The identification light 204 on the right side in the figure, after passing through the first linear polarizer 224 , is also transformed into circularly polarized light after passing through the second quarter wave plate 230 , and then emitted toward the light emitting module 210 .

[0079] Another aspect of the embodiment of the present application provides a display panel, including a light-emitting module 210 and any one of the above-mentioned polarizers, the polarizer being located on the light-emitting side of the light-emitting module. The display panel can collect the above-mentioned polarizer to relieve the discomfort of the user's eyes during use by the light emitted from the display panel, and can also make the identification light 204 reflected by the target object pass through the display panel smoothly, and then be received by the optical collection module below the display panel.

[0080] In another aspect of the embodiment of the present application, a display panel is provided, comprising a light emitting module 210 and any one of the above-mentioned polarizing modules, wherein the polarizing module is located at the light emitting side of the light emitting module 210. The display panel can collect the above-mentioned polarizing module to make the light emitted from the display panel relieve the discomfort of the user's eyes during use, and can also make the identification light 204 reflected by the target object pass through the display panel smoothly, and then be received by the optical collection module below the display panel.

[0081] The display panel may be an organic light emitting diode (OLED) display screen or a liquid crystal display (LCD) display screen, etc., and this application does not impose any limitation thereto.

[0082] Another aspect of the embodiments of the present application provides an electronic device, including an optical collection module and any one of the above-mentioned display panels, the display panel including a light-emitting module 210 and a polarizing module, the optical collection module is located on the side of the light-emitting module 210 away from the polarizing module, and the optical collection module is used to receive at least part of the identification light 204 after passing through the polarizing module.

[0083] Another aspect of the embodiments of the present application provides an electronic device, including an optical collection module and any one of the above-mentioned display panels, the display panel including a light-emitting module 210 and a polarizer, the optical collection module is located on the side of the light-emitting module 210 away from the polarizer, and the optical collection module is used to receive at least part of the identification light 204 after passing through the polarizer.

[0084] In this way, the light emitted from the display panel alleviates the discomfort caused by the user's eyes during use, and also enables the identification light 204 reflected by the target object to smoothly pass through the display panel and then be received by the optical collection module under the display panel.

[0085] A fingerprint recognition method can be preset in the electronic device, and the fingerprint recognition method generally includes steps such as fingerprint image acquisition, preprocessing, feature extraction, and feature matching. Some or all of the above steps can be implemented by traditional computer vision (CV) algorithms, or by deep learning algorithms based on artificial intelligence (AI). Fingerprint recognition technology can be applied to portable or mobile terminals such as smart phones, tablet computers, and gaming devices, as well as other electronic devices such as smart door locks, cars, and bank ATMs, for fingerprint unlocking, fingerprint payment, fingerprint attendance, identity authentication, etc.

[0086] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A polarizer, characterized in that: Used to be configured on the light-emitting side of the light-emitting module, the polarizer has a circular polarization area and a non-circular polarization area, the first light emitted by the light-emitting module is emitted from the circular polarization area as circularly polarized light, the second light emitted by the light-emitting module is emitted from the non-circular polarization area as non-circular polarized light that can be reflected by the target object to form identification light, and at least part of the identification light passes through the polarizer and then emits toward the light-emitting module side.

2. The polarizer according to claim 1, wherein: A hollow structure is provided on the polarizer, the hollow structure forms the non-circular polarization area, and the second light is emitted from the hollow structure as the non-circular polarized light.

3. The polarizer according to claim 2, wherein: The hollowed-out structure is a light-transmitting hole and / or a light-transmitting through groove.

4. The polarizer according to claim 3, wherein: The hollow structure is a light-transmitting hole, and the aperture of the light-transmitting hole is less than or equal to 2 cm; Or; the hollow structure is a light-transmitting groove, and the groove width of the light-transmitting groove is less than or equal to 2 cm.

5. The polarizer according to claim 4, characterized in that: The polarizer is used to be arranged on a side of the light emitting module away from the optical collection module, and the non-circular polarization area covers the orthographic projection area of ​​the optical collection module on the polarizer.

6. The polarizer according to claim 4, wherein: The hollow structure is a light-transmitting hole, the aperture of the light-transmitting hole ranges from 1um to 100um, and there are multiple light-transmitting holes.

7. The polarizer according to claim 6, wherein: A plurality of light-transmitting holes are discretely distributed on the polarizer.

8. The polarizer according to claim 2, wherein: A filling layer is filled in the hollow structure, and the filling layer is a non-polarized light-transmitting layer or a first 1 / 2 wave plate.

9. The polarizer according to any one of claims 2 to 8, characterized in that: The polarizer includes a linear polarizer and a first quarter wave plate which are sequentially arranged along the light emitting direction of the light emitting module, and the hollow structure is located at the first quarter wave plate.

10. The polarizer according to claim 9, wherein: The polarizer further includes a second 1 / 2 wave plate, which is located on a side of the first 1 / 4 wave plate away from the linear polarizer.

11. A polarizing module, characterized in that: It comprises a second 1 / 4 wave plate and the polarizer according to any one of claims 1 to 10, wherein the second 1 / 4 wave plate is located between the polarizer and the light-emitting module.

12. A display panel, characterized in that: It comprises a light-emitting module and the polarizing film as claimed in any one of claims 1 to 10, wherein the polarizing film is located on the light-emitting side of the light-emitting module; or it comprises a light-emitting module and the polarizing module as claimed in claim 11, wherein the polarizing module is located on the light-emitting side of the light-emitting module.

13. An electronic device, characterized in that: The display panel comprises an optical collection module and the display panel as claimed in claim 12, wherein the display panel comprises a light-emitting module and a polarizing module, the optical collection module is located on a side of the light-emitting module away from the polarizing module, and the optical collection module is used to receive at least part of the identification light after passing through the polarizing module; or, the display panel comprises a light-emitting module and a polarizing film, the optical collection module is located on a side of the light-emitting module away from the polarizing film, and the optical collection module is used to receive at least part of the identification light after passing through the polarizing film.

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