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, at least part of light emitted by a light emitting module is emitted through the polaroid to form elliptically polarized light capable of being reflected by a target object to form recognition light, and when the elliptically polarized light is used for subsequent collection of biological characteristic information, the light emitted by the light emitting module can be reflected by the target object to form the recognition light. The uncomfortable feeling of the eyes of a user can be relieved, and meanwhile recognition light rays smoothly penetrate through the polaroid and then are received by the optical collection module below the screen.

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 configured on the light-emitting side of a light-emitting module, wherein at least part of the light emitted by the light-emitting module is emitted through the polarizer as elliptically polarized light that can be reflected by a target object to form identification light, and at least part of the identification light is emitted toward the light-emitting module side after passing through the polarizer.

[0008] Optionally, the polarizer has an elliptically polarized light band, and light with a wavelength in the elliptically polarized light band is emitted through the polarizer as elliptically polarized light, and the elliptically polarized light band of the polarizer is a partial light-emitting band of the light-emitting module.

[0009] Optionally, the elliptically polarized light band of the polarizer includes the green light band of the light-emitting module.

[0010] Optionally, the elliptically polarized light band of the polarizer is from 500nm to 600nm.

[0011] Optionally, the polarizer includes a linear polarizer and a first 1 / 4 wave plate arranged in sequence along the light emitting direction of the light emitting module, the identification light incident on the polarizer is elliptically polarized light, and the major axis of the elliptically polarized light serving as the identification light is not parallel to the fast axis of the first 1 / 4 wave plate.

[0012] Optionally, the polarizer includes a linear polarizer and a first quarter wave plate sequentially arranged along the light emitting direction of the light emitting module, and the polarization direction of the linear polarizer has an angle with the fast axis of the first quarter wave plate, and θ≠45°.

[0013] Optionally, 30°≤θ≤40°, or 50°≤θ≤60°.

[0014] Optionally, the polarizer includes a linear polarizer and a first 1 / 4 wave plate sequentially arranged along the light emitting direction of the light emitting module, and the polarizer also includes a second 1 / 2 wave plate, which is located on the side of the first 1 / 4 wave plate facing away from the linear polarizer.

[0015] 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.

[0016] According to another aspect of the embodiments 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.

[0017] According to another aspect of the embodiments 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.

[0018] 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.

[0019] According to another aspect of the embodiments of the present application, an electronic device is provided, wherein a display panel includes a light-emitting module and a polarizer, an 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.

[0020] The beneficial effects of this application include:

[0021] The present application provides a polarizer, a polarizing module, a display panel and an electronic device. At least part of the light emitted by the light-emitting module is emitted through the polarizer as elliptically polarized light that can be reflected by a target object to form identification light. When the elliptically polarized light is used to collect subsequent biometric information, it can alleviate the discomfort caused to the user's eyes and enable the identification light to pass through the polarizer smoothly and then be received by the optical collection module under the screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 A schematic diagram of the structure of a circular polarized eye protection screen provided by the prior art;

[0024] Figure 2 A schematic diagram of the structure of a display panel provided in an embodiment of the present application;

[0025] Figure 3 A schematic diagram of the structure of another display panel provided in an embodiment of the present application;

[0026] Figure 4 A schematic diagram of the structure of another display panel provided in an embodiment of the present application;

[0027] Figure 5 A schematic diagram of the structure of another display panel provided in an embodiment of the present application;

[0028] Figure 6 A schematic diagram of the structure of another display panel provided in an embodiment of the present application.

[0029] Icons: 12- linear polarizer; 13- 1 / 4 wave plate; 14- finger; 201- first light; 202- elliptically polarized light; 203- identification light; 204- second light; 205- circularly polarized light; 11, 210- light-emitting module; 220- polarizer; 223- first 1 / 4 wave plate; 224- first linear polarizer; 230- second 1 / 4 wave plate. DETAILED DESCRIPTION

[0030] 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.

[0031] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] 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.

[0033] 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.

[0034] Figure 1Although 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.

[0035] 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 203 reflected by the target object to pass through the polarizer 220 and then be received by the optical collection module under the screen.

[0036] The target object includes but is not limited to finger 14 ( Figures 2 to 6 As shown in the figure), palm, human eye, etc., the light reflected by the target object carries the biometric information of the target object, and is therefore called recognition light 203. 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.

[0037] Please continue to refer to Figure 2 The polarizer 220 can adjust the polarization state of at least part of the light emitted by the light-emitting module, so that at least part of the light can be emitted from the polarizer 220 in the form of elliptically polarized light 202, and then when the elliptically polarized light 202 is used for subsequent collection of biometric information, it can alleviate the discomfort caused to the user's eyes and enable the identification light 203 to pass through the polarizer 220 smoothly and then be received by the optical collection module under the screen.

[0038] For ease of understanding, Figure 2 As shown, at least part of the light emitted by the light-emitting module (referred to as the first light 201 for convenience of description) is emitted toward the polarizer 220. After the first light 201 is incident on the polarizer 220, the polarizer 220 adjusts it to elliptically polarized light 202 and continues to emit toward the finger 14. The elliptically polarized light 202 is incident on the finger 14 and is reflected by the finger 14 to form the identification light 203. At this time, the polarization state of the identification light 203 is still elliptically polarized. With the characteristics of elliptically polarized light, at least part of the identification light 203 can smoothly pass through the polarizer and propagate toward the light-emitting module until it is received and imaged by the optical collection module under the screen, and the identification of the finger 14 is completed with the subsequent image processing. In this process, since the elliptically polarized light 202 emitted from the polarizer 220 is closer to the circularly polarized light 205 than the linearly polarized light, it can also alleviate the discomfort of the user's eyes during use.

[0039] When the polarizer 220 adjusts the first light 201 to the elliptically polarized light 202, the adjustment can be made according to the wavelength of the first light 201. For example, the polarizer 220 has an elliptically polarized wavelength, and when the wavelength of the light incident on the polarizer 220 is within the elliptically polarized wavelength, the polarizer 220 can adjust it to emit the elliptically polarized light 202. Therefore, when setting the elliptically polarized wavelength of the polarizer 220, the elliptically polarized wavelength should be matched and corresponded to the light emitting wavelength of the light emitting module, so that the wavelength of the first light 201 is within the elliptically polarized wavelength.

[0040] Therefore, there are multiple corresponding relationships between the elliptically polarized light band of the polarizer 220 and the light-emitting light band of the light-emitting module as follows:

[0041] In one embodiment, the elliptically polarized light band of the polarizer 220 includes the light band of the light emitting module, that is, all the light emitted by the light emitting module is the first light 201, and after the first light 201 enters the polarizer 220, it is adjusted by the polarizer 220 to be emitted as elliptically polarized light 202. In this way, more light can pass through the polarizer 220 smoothly and be received and imaged by the optical collection module under the screen, which is more conducive to the recognition of the target object.

[0042] Another type of Figure 3 As shown, the elliptically polarized light band of the polarizer 220 includes the light band of part of the light emitting module, that is, only part of the light emitted by the light emitting module is the first light 201, and the first light 201 can be adjusted by the polarizer 220 to be emitted as elliptically polarized light 202. Of course, the setting of the elliptically polarized light band should be able to meet the requirements for target recognition. Figure 3As shown, the light outside the elliptically polarized light band (for ease of description, referred to as the second light 204) can be designed to be adjusted by the polarizer 220 to emit circularly polarized light 205. This can not only meet the requirements of target object recognition, but also better alleviate the discomfort caused to the eyes of users during use.

[0043] To further understand the technical solution of the present application, the following description will be given when the polarizer 220 and the light-emitting module are applied to a display panel:

[0044] It is understandable that when the light-emitting module is applied to the display panel, the light-emitting module can be pixelated, that is, the light emitted by the light-emitting module can be regarded as light emitted by multiple pixels, and each pixel can emit multiple colors, specifically: each pixel is subdivided into sub-pixels that can emit red light, green light, and blue light, and the diversity of the light-emitting colors of the pixel is achieved by mixing and blending the light emitted by each sub-pixel in the pixel in different proportions. Therefore, the light-emitting bands of the light-emitting module are mainly blue light, green light, and red light bands. According to the corresponding relationship between the elliptically polarized band of the aforementioned polarizer 220 and the light-emitting band of the light-emitting module:

[0045] When the elliptically polarized light band of the polarizer 220 includes the light band of the light emitting module, the elliptically polarized light band of the polarizer 220 includes blue light, green light and red light bands. Therefore, after the blue light, green light and red light emitted by the light emitting module enter the polarizer 220, they are adjusted by the polarizer 220 to be emitted as elliptically polarized light 202.

[0046] When the elliptically polarized light band of the polarizer 220 includes the light-emitting band of a part of the light-emitting module, the elliptically polarized light band of the polarizer 220 includes one or a combination of blue light, green light and red light bands, such as Figure 3 As shown, the elliptically polarized light band of the polarizer 220 includes the green light band. Correspondingly, the green light is used as the first light 201, and the green light emitted by the light emitting module can be adjusted by the polarizer 220 to be emitted as elliptically polarized light 202. The green light is used for subsequent target information collection, which can effectively improve the quality of imaging. Figure 3 As shown, the wavelength of the second light 204 of the light emitting module can also be made to be in the circular polarization band of the polarizer 220, so that the second light 204 can be adjusted to be emitted as circular polarized light 205 after passing through the polarizer 220. For example, when the elliptically polarized band of the polarizer 220 includes the green light band, the blue light and red light bands of the light emitting module can be made to be in the circular polarization band of the polarizer 220, so that the blue light and the red light can be adjusted to be emitted as circular polarized light 205 after entering the polarizer 220.

[0047] In some possible implementations, the elliptically polarized light band of the polarizer 220 is 500nm to 600nm, in other words, after light with a wavelength in the range of 500nm to 600nm enters the polarizer 220, it can be adjusted by the polarizer 220 to emit elliptically polarized light 202. For example, the elliptically polarized light band of the polarizer 220 is 550nm to 600nm.

[0048] In some possible implementations, the polarizer 220 includes linear polarizers arranged in sequence along the light emitting direction of the light emitting module (for ease of comparison with Figure 1 The linear polarizer 12 is distinguished from the existing linear polarizer 12, and the linear polarizer in this application is referred to as the first linear polarizer 224) and the first 1 / 4 wave plate 223. Figure 3 As shown, after the light emitting module emits the first light 201, the first light 201 is non-polarized light, which is adjusted to linearly polarized light after passing through the first linear polarizer 224, and the linearly polarized light then enters the first 1 / 4 wave plate 223. Since the wavelength of the first light 201 is in the elliptically polarized light wavelength band, the linearly polarized light is adjusted to elliptically polarized light 202 by the first 1 / 4 wave plate 223. The elliptically polarized light 202 is incident on the finger 14 and is reflected by the finger 14 (a half-wave loss will occur in this process, resulting in the opposite rotation direction) to form the identification light 203. The identification light 203 remains elliptically polarized before entering the polarizer. The identification light 203 is in an elliptically polarized state (i.e., elliptically polarized light) and then enters the first quarter wave plate 223. Since the major axis of the elliptically polarized light serving as the identification light 203 is not parallel to the fast axis of the first quarter wave plate 223 (in other words, the major and minor axes of the elliptically polarized light serving as the identification light 203 are inconsistent with the fast and slow axes of the first quarter wave plate 223), the identification light 203 is still in an elliptically polarized state after exiting the first quarter wave plate 223, and then is adjusted to be linearly polarized light after entering the first linear polarizer 224 and is emitted toward the light-emitting module until it is received by the optical collection module under the screen.

[0049] If the light-emitting module also emits a second light 204 (the second light 204 is outside the elliptically polarized light band and within the circularly polarized light band), the second light 204 is non-polarized light, which is adjusted to linearly polarized light after passing through the first linear polarizer 224, and the linearly polarized light then enters the first 1 / 4 wave plate 223. Since the wavelength of the second light 204 is within the circularly polarized light band, the linearly polarized light is adjusted by the first 1 / 4 wave plate 223 to circularly polarized light 205 that can be received by the user's eyes, thereby alleviating the discomfort caused by the user during use.

[0050] When the polarizer 220 adjusts the first light 201 to the elliptically polarized light 202, it can also adjust according to the polarization direction of the incident light. For example, the polarizer 220 includes linear polarizers arranged in sequence along the light emitting direction of the light emitting module (for the convenience of Figure 1In order to distinguish the existing linear polarizer 12, the linear polarizer in the present application will be referred to as the first linear polarizer 224) and the first 1 / 4 wave plate 223, so that the polarization direction of the first linear polarizer 224 and the fast axis of the first 1 / 4 wave plate 223 have an angle other than 45 degrees, so that the polarizer 220 can adjust the first light 201 to be emitted as elliptically polarized light 202.

[0051] Specifically, Figure 5 As shown, after the light emitting module emits the first light 201, the first light 201 is non-polarized light, which is adjusted to linearly polarized light after passing through the first linear polarizer 224. The linearly polarized light then enters the first 1 / 4 wave plate 223. Since the polarization direction of the first linear polarizer 224 and the fast axis of the first 1 / 4 wave plate 223 have an angle of non-45 degrees, the polarization direction of the linearly polarized light and the fast axis of the first 1 / 4 wave plate 223 have an angle of non-45 degrees. Therefore, the linearly polarized light is adjusted by the first 1 / 4 wave plate 223 to be elliptically polarized light 202, and the elliptically polarized light 202 is incident on the finger 14 and is reflected by the finger 14 (this The identification light 203 maintains an elliptically polarized state and then enters the first 1 / 4 wave plate 223. Since the long axis of the identification light 203 is not parallel to the fast axis of the first 1 / 4 wave plate 223 (in other words, the long and short axes of the identification light 203 are inconsistent with the fast and slow axes of the first 1 / 4 wave plate 223), the identification light 203 is still in an elliptically polarized state after being emitted from the first 1 / 4 wave plate 223, and then is adjusted to be a linearly polarized light after being incident on the first linear polarizer 224 and is emitted toward the light-emitting module until it is received by the optical collection module under the screen.

[0052] In some possible embodiments, when setting the angle θ between the polarization direction of the first linear polarizer 224 and the fast axis of the first 1 / 4 wave plate 223, in addition to θ≠45°, it should be kept in an appropriate range as much as possible. The main reason is that: taking 45° as a reference, if θ approaches 0° or 90°, the elliptically polarized light 202 of the first light 201 after being emitted from the first 1 / 4 wave plate 223 will be closer to the linear polarization state. Although it can pass through the polarizer 220 with lower light loss after being reflected by the finger 14 later, the form closer to the linear polarization state also reduces its ability to alleviate the discomfort caused by the eyes of the user during use; taking 45° as a reference, if θ approaches 45°, the elliptically polarized light 202 of the first light 201 after being emitted from the first 1 / 4 wave plate 223 will be closer to the circular polarization state. Although it can better alleviate the discomfort caused by the eyes of the user during use, it needs to pass through the polarizer 220 with higher light loss after being reflected by the finger 14 later. Based on this consideration, the angle between the polarization direction of the first linear polarizer 224 and the fast axis of the first quarter wave plate 223 is θ, and θ satisfies any of the following conditions: 30°≤θ≤40°, or, 50°≤θ≤60°. θ within this range can not only meet the needs of target object recognition, but also better alleviate the discomfort caused by the user's eyes during use.

[0053] When 30°≤θ≤40°, θ may be 30°, 32°, 35°, 37°, 40°, etc.

[0054] When 50°≤θ≤60°, θ can be 50°, 52°, 55°, 57°, 60°, etc.

[0055] 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.

[0056] In another aspect of an embodiment of the present application, a polarization module is provided, including a second quarter wave plate 230 and any one of the above-mentioned polarizers 220 , wherein the second quarter wave plate 230 is located between the polarizer 220 and the light-emitting module 210 .

[0057] Reference Figure 4 or Figure 6 , through the cooperation of the second 1 / 4 wave plate 230 and the first linear polarizer 224, it is possible to block the ambient light from being reflected by the display panel and entering the user's eyes. And when the second 1 / 4 wave plate 230 is provided, refer to Figure 4 or Figure 6The identification light 203 passing through the first linear polarizer 224 is all linearly polarized light, and then the linearly polarized light is transformed into circularly polarized light 205 after passing through the second 1 / 4 wave plate 230 , and then emitted toward the light-emitting module 210 .

[0058] 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 polarizers 220, wherein the polarizer 220 is located at the light emitting side of the light emitting module 210. The display panel can collect the above-mentioned polarizer 220 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 203 reflected by the target object pass through the display panel smoothly, and then be received by the optical collection module below the display panel.

[0059] In another aspect of the embodiments 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 203 reflected by the target object pass through the display panel smoothly, and then be received by the optical collection module below the display panel.

[0060] 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.

[0061] In another aspect of the embodiments of the present application, an electronic device is provided, comprising an optical collection module and any of the above-mentioned display panels, wherein the display panel comprises 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 203 after passing through the polarizing module. In this way, the light emitted from the display panel alleviates the discomfort of the user's eyes during use, and also enables the identification light 203 reflected by the target object to smoothly pass through the display panel and then be received by the optical collection module below the display panel.

[0062] In another aspect of the embodiment of the present application, an electronic device is provided, wherein the display panel includes a light-emitting module and a polarizer 220, and the optical collection module is located on the side of the light-emitting module 210 away from the polarizer 220, and the optical collection module is used to receive at least part of the identification light 203 after passing through the polarizer 220. 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 203 reflected by the target object to smoothly pass through the display panel, and then be received by the optical collection module below the display panel.

[0063] 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.

[0064] 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: It is used to be configured on the light-emitting side of the light-emitting module, and at least part of the light emitted by the light-emitting module is emitted through the polarizer as elliptically 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: The polarizer has an elliptically polarized light band, and light with a wavelength in the elliptically polarized light band is emitted from the polarizer as elliptically polarized light. The elliptically polarized light band of the polarizer is a partial light-emitting light band of the light-emitting module.

3. The polarizer according to claim 2, wherein: The elliptically polarized light band of the polarizer includes the green light band of the light emitting module.

4. The polarizer according to claim 3, wherein: The elliptically polarized light band of the polarizer is 500nm to 600nm.

5. The polarizer according to any one of claims 1 to 4, characterized in that: The polarizer includes a linear polarizer and a first 1 / 4 wave plate arranged in sequence along the light emitting direction of the light emitting module. The identification light incident on the polarizer is elliptically polarized light, and the major axis of the elliptically polarized light serving as the identification light is not parallel to the fast axis of the first 1 / 4 wave plate.

6. The polarizer according to claim 1, wherein: The polarizer includes a linear polarizer and a first quarter wave plate sequentially arranged along the light emitting direction of the light emitting module, and the polarization direction of the linear polarizer has an angle with the fast axis of the first quarter wave plate, and the angle is θ, and 7. The polarizer according to claim 6, wherein: 30°≤θ≤40°, or, 50°≤θ≤60°.

8. The polarizer according to any one of claims 1 to 4, 6 to 7, characterized in that: The polarizer includes a linear polarizer and a first 1 / 4 wave plate arranged in sequence along the light emitting direction of the light emitting module, and the polarizer also includes a second 1 / 2 wave plate, which is located on the side of the first 1 / 4 wave plate away from the linear polarizer.

9. A polarizing module, characterized in that: It comprises a second 1 / 4 wave plate and the polarizer as claimed in any one of claims 1 to 8, wherein the second 1 / 4 wave plate is located between the polarizer and the light-emitting module.

10. 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 8, 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 9, wherein the polarizing module is located on the light-emitting side of the light-emitting module.

11. An electronic device, characterized in that: It comprises an optical collection module and a display panel as claimed in claim 10; 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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