Display screen, under-screen optical fingerprint module and electronic equipment

Abstract

The embodiment of the utility model provides a display screen, an under-screen optical fingerprint module and electronic equipment, and the display screen comprises a first surface of a cover plate which is used for providing a pressing surface, a first quarter-wave plate is arranged between a first surface of a polaroid and a second surface of the cover plate, the second surface of the polaroid is opposite to a first surface of a light-emitting layer, and a second quarter-wave plate is arranged between the first quarter-wave plate and the cover plate. The second surface of the light-emitting layer is opposite to the under-screen optical fingerprint module; the light-emitting layer can emit fingerprint identification light; the polaroid can convert the fingerprint identification light into first linearly polarized light; the first quarter-wave slide can convert second linearly polarized light with the wavelength outside a wavelength threshold range in the first linearly polarized light into first circularly polarized light, and enables third linearly polarized light with the wavelength within the wavelength threshold range in the first linearly polarized light to directly pass through; and the under-screen optical fingerprint module performs fingerprint identification based on at least part of the third linearly polarized light reflected by the to-be-identified object. According to the display screen, under-screen optical fingerprint identification is realized while the visual fatigue of a user is reduced.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of optical technology, and in particular to a display screen, an under-screen optical fingerprint module, and an electronic device. Background Art

[0002] Light has polarization properties. The asymmetry of its vibration direction with respect to its propagation direction is called polarization. Common light sources can be categorized as circularly polarized and linearly polarized. Because circularly polarized light is closer to natural light, displays that use circularly polarized light can cause less visual fatigue than those that use linearly polarized light.

[0003] Currently, a quarter glass is placed between the screen cover and the polarizer to convert the linearly polarized light passing through the polarizer into circularly polarized light to reduce visual fatigue for users.

[0004] However, placing a quarter glass sheet between the screen cover and the polarizer will change the propagation direction of the light reflected by the object to be identified during fingerprint recognition, making the reflected light unable to pass through the polarizer. Therefore, display screens using circularly polarized light cannot perform under-screen fingerprint recognition. Utility Model Content

[0005] In view of this, embodiments of the present application provide a display screen, an under-screen optical fingerprint module, and an electronic device to at least partially solve the above-mentioned problems.

[0006] According to a first aspect of an embodiment of the present application, a display screen is provided, which is arranged opposite to an under-screen optical fingerprint module, and the display screen includes: a cover plate, a first quarter glass, a polarizer, and a light-emitting layer; the first surface of the cover plate is used to provide a pressing surface, the first quarter glass is arranged between the first surface of the polarizer and the second surface of the cover plate, the second surface of the polarizer is opposite to the first surface of the light-emitting layer, and the second surface of the light-emitting layer is opposite to the under-screen optical fingerprint module; the light-emitting layer is configured to emit fingerprint recognition light; the polarizer is configured to convert the fingerprint recognition light into first linearly polarized light; the first quarter glass is configured to convert second linearly polarized light in the first linearly polarized light having a wavelength outside a wavelength threshold range into first circularly polarized light, and to allow third linearly polarized light in the first linearly polarized light having a wavelength within the wavelength threshold range to pass directly; wherein the under-screen optical fingerprint module performs fingerprint recognition based on at least a portion of the third linearly polarized light reflected by an object to be identified pressed on the pressing surface.

[0007] In a possible implementation, the wavelength threshold range is [400 nm, 500 nm].

[0008] In one possible implementation, the display screen further includes a second quarter glass, which is disposed between the second surface of the polarizer and the first surface of the light-emitting layer; the second quarter glass is configured to convert light reflected by the light-emitting layer into fourth linearly polarized light, so that the fourth linearly polarized light cannot pass through the polarizer.

[0009] In one possible implementation, the second quarter glass is configured to convert at least a portion of the third linearly polarized light reflected by the object to be identified into second circularly polarized light, so that the under-screen optical fingerprint module performs fingerprint recognition based on the second circularly polarized light.

[0010] In a possible implementation, the light-emitting layer includes an OLED light-emitting layer.

[0011] According to a second aspect of the embodiments of the present application, an under-screen optical fingerprint module is provided, which is arranged opposite to the display screen as described in the first aspect of the embodiments of the present application. The under-screen optical fingerprint module is constructed to perform fingerprint recognition based on at least part of the third linearly polarized light reflected by the object to be identified pressed on the pressing surface, wherein the third linearly polarized light is within a wavelength threshold range.

[0012] In one possible implementation, the aperture range of the under-screen optical fingerprint module is [F1.0, F2.0].

[0013] In one possible implementation, the exposure time range of the under-screen optical fingerprint module is [30ms, 100ms].

[0014] In one possible implementation, the under-screen optical fingerprint module includes a filter; the filter is configured to filter out light having a wavelength outside the wavelength threshold range.

[0015] According to a third aspect of the embodiments of the present application, an electronic device is provided, comprising a display screen as described in the first aspect of the embodiments of the present application and an under-screen optical fingerprint module as described in the second aspect of the embodiments of the present application, wherein the under-screen optical fingerprint module is arranged between the display screen and the back cover of the electronic device.

[0016] According to the display screen provided by the embodiment of the present application, the display screen includes a cover plate, a first quarter glass, a polarizer and a light-emitting layer. The first quarter glass is arranged between the cover plate and the polarizer, and the polarizer is arranged between the first quarter glass and the light-emitting layer. Due to the provision of the first quarter glass, the light emitted by the light-emitting layer can be converted into circularly polarized light, which can reduce the user's visual fatigue. Moreover, since the first quarter glass will not linearly polarize light with a wavelength within a wavelength threshold range, the linearly polarized light with a wavelength within the wavelength threshold range is still linearly polarized light after passing through the first quarter glass. Therefore, the under-screen optical fingerprint module can perform fingerprint recognition based on the linearly polarized light with a wavelength within the wavelength threshold range, thereby realizing the fingerprint recognition function. The display screen can realize under-screen optical fingerprint recognition while reducing the user's visual fatigue. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is a schematic diagram of a display screen provided in an embodiment of the present application;

[0019] Figure 2 Schematic diagram of different light intensities emitted from a display screen provided by an embodiment of the present application;

[0020] Figure 3 is a schematic diagram of another display screen provided in an embodiment of the present application;

[0021] Figure 4 is a schematic diagram of light transmittance of different fingers provided in an embodiment of the present application;

[0022] Figure 5 This is a schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions 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 only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field should fall within the scope of protection of the embodiments of the present application.

[0024] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0025] It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0026] As mentioned earlier, light has polarization, and the asymmetry of the vibration direction with respect to the propagation direction is called polarization. Common light sources can be divided into two types: circularly polarized light and linearly polarized light. Because circularly polarized light is closer to natural light, display screens that use circularly polarized light cause less visual fatigue than display screens that use linearly polarized light. Currently, a quarter-glass is set between the screen cover and the polarizer to convert the linearly polarized light passing through the polarizer into circularly polarized light to reduce visual fatigue for the user. However, setting a quarter-glass between the screen cover and the polarizer will change the propagation direction of the light reflected by the object to be identified during fingerprint recognition, making it impossible for the reflected light to pass through the polarizer. Therefore, display screens that use circularly polarized light cannot perform under-screen fingerprint recognition.

[0027] The present application provides a display screen, which includes a cover plate, a first quarter glass, a polarizer and a light-emitting layer. The first quarter glass is arranged between the cover plate and the polarizer, and the polarizer is arranged between the first quarter glass and the light-emitting layer. Due to the provision of the first quarter glass, the light emitted by the light-emitting layer can be converted into circularly polarized light, which can reduce the user's visual fatigue. Moreover, since the first quarter glass will not linearly polarize light with a wavelength within a wavelength threshold range, the linearly polarized light with a wavelength within the wavelength threshold range is still linearly polarized light after passing through the first quarter glass. Therefore, the under-screen optical fingerprint module can perform fingerprint recognition based on the linearly polarized light with a wavelength within the wavelength threshold range, thereby realizing the fingerprint recognition function. The display screen can realize under-screen optical fingerprint recognition while reducing the user's visual fatigue.

[0028] The display screen, under-screen optical fingerprint module and electronic device provided by this application are described below through examples.

[0029] Figure 1Schematic diagram of a display screen provided by an embodiment of the present application, wherein the display screen 100 and the under-screen optical fingerprint module 300 are arranged opposite to each other, as shown in FIG. Figure 1 As shown, the display screen 100 includes a cover plate 101 , a first quarter glass 102 , a polarizer 103 and a light emitting layer 104 .

[0030] The first surface of the cover 101 is used to provide a pressing surface. The first quarter glass 102 is arranged between the first surface of the polarizer 103 and the second surface of the cover 101. The second surface of the polarizer 103 is opposite to the first surface of the light-emitting layer 104, and the second surface of the light-emitting layer 104 is opposite to the under-screen optical fingerprint module 300.

[0031] The light-emitting layer 104 can emit fingerprint recognition light 201, the polarizer 103 can convert the fingerprint recognition light 201 into a first linearly polarized light 202, the first quarter glass 102 can convert the second linearly polarized light in the first linearly polarized light 202 whose wavelength is outside the wavelength threshold range into a first circularly polarized light 203, and allow the third linearly polarized light 204 in the first linearly polarized light 202 whose wavelength is within the wavelength threshold range to pass directly, wherein the under-screen optical fingerprint module 300 performs fingerprint recognition based on at least part of the third linearly polarized light 204 reflected by the object to be identified pressed on the pressing surface.

[0032] The first surface of the cover 101 provides a pressing surface, and the user can touch the screen and / or perform fingerprint recognition on the first surface of the cover 101, for example: pressing the finger on the fingerprint recognition area on the cover 101 corresponding to the under-screen optical fingerprint module 300. In one example, the cover 101 can be a glass cover 101.

[0033] The first quarter glass 102 is disposed between the cover 101 and the polarizer 103. The polarizer 103 is disposed between the first quarter glass 102 and the light-emitting layer 104. The light-emitting layer 104 can emit fingerprint recognition light 201 during fingerprint recognition. In one example, the light-emitting layer 104 can simultaneously emit red, green, and blue light. After the light-emitting layer 104 emits fingerprint recognition light 201, the fingerprint recognition light 201 propagates in various directions. After passing through the polarizer 103, the fingerprint recognition light 201 is converted into first linearly polarized light 202 that propagates in a fixed direction. The first linearly polarized light 202 includes light of various wavelengths, for example, blue, green, and red. When the first linearly polarized light 202 passes through the first quarter glass 102, the second linearly polarized light in the first linearly polarized light 202 with a wavelength outside the wavelength threshold range is phase-delayed by the first quarter glass 102 and converted into the first circularly polarized light 203. The third linearly polarized light 204 in the first linearly polarized light 202 with a wavelength within the wavelength threshold range can pass directly through the first quarter glass 102 without being phase-delayed by the first quarter glass 102. It should be noted that the first quarter glass 102 in the embodiment of the present application is a special quarter glass that only phase-delays light with a wavelength outside the wavelength threshold range. The under-screen optical fingerprint module 300 can perform fingerprint recognition based on at least a portion of the third linearly polarized light 204 reflected back by the finger.

[0034] Below Figure 1 For example, when the light-emitting layer 104 emits the fingerprint recognition light 201, the fingerprint recognition light 201 is converted into the first linear polarized light 202 through the polarizer 103. The first linear polarized light 202 passes through the first quarter glass 102, and the second linear polarized light in the first linear polarized light 202 is converted into the first circular polarized light 203. The third linear polarized light 204 in the first linear polarized light 202 is directly emitted from the first quarter glass 102. The first circular polarized light 203 and the third linear polarized light 204 will both be reflected by the finger, and at least part of the reflected light will be reflected back. The first circularly polarized light 203 passes through the first quarter glass 102 to convert the first circularly polarized light 203 into linearly polarized light with a direction different from the second linearly polarized light. At this time, the linearly polarized light cannot pass through the polarizer 103, and at least part of the reflected third linearly polarized light 204 is directly emitted from the first quarter glass 102, and enters the under-screen optical fingerprint module 300 after at least passing through the polarizer 103 and the light-emitting layer 104. In this way, the under-screen optical fingerprint module 300 can perform fingerprint recognition based on at least part of the reflected third linearly polarized light 204.

[0035] In an embodiment of the present application, the display screen 100 includes a cover plate 101, a first quarter glass 102, a polarizer 103 and a light-emitting layer 104. The first quarter glass 102 is arranged between the cover plate 101 and the polarizer 103, and the polarizer 103 is arranged between the first quarter glass 102 and the light-emitting layer 104. Due to the provision of the first quarter glass 102, the light emitted by the light-emitting layer 104 can be converted into circularly polarized light, which can reduce the user's visual fatigue. Moreover, since the first quarter glass 102 will not linearly polarize light with a wavelength within the wavelength threshold range, the linearly polarized light with a wavelength within the wavelength threshold range is still linearly polarized light after passing through the first quarter glass 102. Therefore, the under-screen optical fingerprint module 300 can perform fingerprint recognition based on the linearly polarized light with a wavelength within the wavelength threshold range to realize the fingerprint recognition function. The display screen 100 can realize under-screen optical fingerprint recognition while reducing the user's visual fatigue.

[0036] In a possible implementation, the wavelength threshold range is [400 nm, 500 nm].

[0037] The wavelength threshold range can be set to [400nm, 500nm]. The first quarter glass 102 can convert linearly polarized light with a wavelength outside [400nm, 500nm] into circularly polarized light, and will not perform any processing on linearly polarized light with a wavelength within [400nm, 500nm]. Light with a wavelength threshold range of [400nm, 500nm] is blue light. Figure 2 Schematic diagram of different light intensities emitted from display screens provided in an embodiment of the present application. Figure 2 As shown, Figure 2 The horizontal axis is used to represent the wavelength of light, and the vertical axis is used to represent the intensity of light. Figure 2 Different curves in the graph represent the emitted light corresponding to different screens. The emission intensity of blue light with a wavelength within [400nm, 500nm] is much lower than that of green light and red light with a wavelength between [500nm, 750nm]. Therefore, the human eye is much less sensitive to blue light than green light and red light. Converting linearly polarized green and red light into circularly polarized light has a stronger effect of reducing user visual fatigue. Therefore, the wavelength threshold range can be set to [400nm, 500nm], that is, the first quarter glass 102 does not perform phase delay on blue light.

[0038] In the embodiment of the present application, the wavelength threshold range is [400nm, 500nm], so that fingerprint recognition can be performed through blue light with lower emission intensity, and converting green light and red light with higher emission intensity into circularly polarized light can improve the effect of reducing the user's visual fatigue, thereby making the effect of reducing the user's visual fatigue stronger without affecting the fingerprint recognition function.

[0039] Figure 3 is a schematic diagram of another display screen provided in an embodiment of the present application, such as Figure 3 As shown, the display screen 100 also includes a second quarter glass 105, which is arranged between the second surface of the polarizer 103 and the first surface of the light-emitting layer 104. The second quarter glass 105 can convert the light reflected by the light-emitting layer 104 into fourth linear polarized light 206, so that the fourth linear polarized light 206 cannot pass through the polarizer 103.

[0040] The display screen 100 further includes a second quarter glass 105, which is disposed between the polarizer 103 and the light-emitting layer 104. When ambient light enters the display screen 100, it first passes through the polarizer 103 to convert the ambient light into linearly polarized light. The linearly polarized light then passes through the second quarter glass 105 to convert it into circularly polarized light. After the circularly polarized light is transmitted to the light-emitting layer 104, it is at least partially reflected by the light-emitting layer 104. In this case, the light reflected by the light-emitting layer 104 is circularly polarized light. When the reflected circularly polarized light passes through the second quarter glass 105, it is converted into fourth linearly polarized light 206. Due to the phase delay processing by the second quarter glass 105, the fourth linearly polarized light 206 and the polarizer 103 have different propagation directions. Therefore, the fourth linearly polarized light 206 cannot pass through the polarizer 103 and is intercepted by the polarizer 103. This prevents the light reflected by the light-emitting layer 104 from emitting from the display screen 100, thereby improving the display quality of the display screen 100.

[0041] In one example, the second quarter-wave plate 105 can be a normal quarter-wave plate, that is, it can phase-retard light of all wavelengths, rather than only phase-retarding light of a specific wavelength like the first quarter-wave plate. Similar to the above principle, it can prevent the light-emitting layer 104 from reflecting the third linearly polarized light 204 used for fingerprint recognition from emitting from the display screen 100.

[0042] In the embodiment of the present application, the display screen 100 further includes a second quarter glass 105, which can convert the light reflected by the light-emitting layer 104 into a fourth linearly polarized light 206. The fourth linearly polarized light 206 cannot pass through the polarizer 103, thereby preventing the light reflected by the light-emitting layer 104 from emitting from the display screen 100, making it impossible for the user to see the light reflected by the light-emitting layer 104, thereby improving the display effect of the display screen 100.

[0043] In one possible implementation, the second quarter glass 105 can convert at least part of the third linearly polarized light 204 reflected by the object to be identified into second circularly polarized light 205 , so that the under-screen optical fingerprint module 300 performs fingerprint recognition based on the second circularly polarized light 205 .

[0044] like Figure 3 In the screen structure shown, when a second quarter glass 105 is provided in the display screen 100, at least part of the third linearly polarized light 204 reflected back by the object to be identified passes through the polarizer 103 and enters the second quarter glass 105. The second quarter glass 105 phase delays at least part of the reflected third linearly polarized light 204 to generate a second circularly polarized light 205. The second circularly polarized light 205 passes through the light-emitting layer 104 and enters the under-screen optical fingerprint module 300. The under-screen optical fingerprint module 300 performs fingerprint recognition based on the second circularly polarized light 205.

[0045] It should be understood that when the second circularly polarized light 205 penetrates the light-emitting layer 104, at least a portion of the second circularly polarized light 205 will be reflected by the light-emitting layer 104. At this time, the reflected second circularly polarized light 205 is converted into linearly polarized light with a direction different from that of the third linearly polarized light 204 through the second quarter glass 105, and cannot penetrate the polarizer 103. This can prevent the third linearly polarized light 204 reflected by the light-emitting layer 104 for fingerprint identification from emitting from the display screen 100.

[0046] In an embodiment of the present application, when a second quarter glass 105 is provided in the screen, due to the presence of the second quarter glass 105, the reflected third linearly polarized light 204 will be converted into second circularly polarized light 205. At this time, the under-screen optical fingerprint module 300 performs fingerprint recognition based on the second circularly polarized light 205, and the fingerprint recognition function can be realized. Since the second quarter glass 105 can prevent the light reflected by the light-emitting layer 104 from emitting from the display screen 100, the screen display effect can be improved without affecting the fingerprint recognition function.

[0047] In one possible implementation, the light-emitting layer 104 includes an OLED light-emitting layer.

[0048] In the embodiment of the present application, the display screen 100 is an OLED display screen, which can realize under-screen optical fingerprint recognition and have a better display effect.

[0049] An embodiment of the present application also provides an under-screen optical fingerprint module for the display screen. The under-screen optical fingerprint module is arranged relative to the display screen in any of the above embodiments. The under-screen optical fingerprint module can perform fingerprint recognition based on at least part of the third linearly polarized light reflected by the object to be identified pressed on the pressing surface, wherein the third linearly polarized light is within the wavelength threshold range.

[0050] In an embodiment of the present application, the under-screen optical fingerprint module can perform fingerprint recognition based on at least part of the third linearly polarized light reflected by the object to be identified pressed on the pressing surface, thereby realizing the under-screen optical fingerprint recognition function. Since the under-screen fingerprint optical module is arranged relative to the display screen in any of the above embodiments, and the display screen is a circularly polarized light display screen, it can realize under-screen optical fingerprint recognition while reducing the user's visual fatigue.

[0051] In one possible implementation, the aperture range of the under-screen optical fingerprint module is [F1.0, F2.0].

[0052] It should be noted that since the display screen is a circularly polarized light display screen, that is, a first quarter glass is provided, the under-screen optical fingerprint module performs fingerprint recognition based on at least part of the third linearly polarized light reflected by the object to be identified, and the third linearly polarized light is linearly polarized light within the wavelength threshold range. Therefore, the under-screen optical fingerprint module is not based on full-wavelength light for fingerprint recognition. Compared with fingerprint recognition based on full-wavelength light, the light intensity of at least part of the third linearly polarized light reflected back by the object to be identified is lower. When other conditions remain unchanged, increasing the aperture of the under-screen optical fingerprint module can increase the amount of light entering the optical fingerprint module. Therefore, it is necessary to increase the aperture of the under-screen optical fingerprint module to increase the amount of light entering the under-screen optical fingerprint module to prevent the fingerprint image recognized by the under-screen optical fingerprint module from being darker due to the low light intensity of at least part of the third linearly polarized light reflected back, affecting the fingerprint recognition function.

[0053] In the embodiment of the present application, the aperture range of the under-screen optical fingerprint module is [F1.0, F2.0], which can increase the amount of light entering the under-screen optical fingerprint module, so that the under-screen optical fingerprint module can perform fingerprint recognition based on the third linear polarized light with lower light intensity. Compared with the smaller aperture of the under-screen optical fingerprint module, the brightness and clarity of the fingerprint image recognized based on the third linear polarized light can be improved, the accuracy of fingerprint recognition can be improved, and accurate fingerprint recognition can be achieved while the display screen is set to a circularly polarized light display screen.

[0054] In one possible implementation, the exposure time range of the under-screen optical fingerprint module is [30ms, 100ms].

[0055] It should be noted that since the display screen is a circularly polarized light display screen, that is, a first quarter glass is provided, the under-screen optical fingerprint module performs fingerprint recognition based on at least part of the third linearly polarized light reflected by the object to be identified, and the third linearly polarized light is linearly polarized light within the wavelength threshold range. Therefore, the under-screen optical fingerprint module is not based on full-wavelength light for fingerprint recognition. Compared with fingerprint recognition based on full-wavelength light, the light intensity of at least part of the third linearly polarized light reflected back by the object to be identified is lower. When other conditions remain unchanged, increasing the exposure time of the under-screen optical fingerprint module can increase the amount of light entering the optical fingerprint module. Therefore, it is necessary to increase the exposure time of the under-screen optical fingerprint module to increase the amount of light entering the under-screen optical fingerprint module to prevent the fingerprint image recognized by the under-screen optical fingerprint module from being darker due to the low light intensity of at least part of the third linearly polarized light reflected back, affecting the fingerprint recognition function.

[0056] In the embodiment of the present application, the exposure time range of the under-screen optical fingerprint module is [30ms, 100ms], which can increase the amount of light entering the under-screen optical fingerprint module, so that the under-screen optical fingerprint module can perform fingerprint recognition based on the third linear polarized light with lower light intensity. Compared with the shorter exposure time of the under-screen optical fingerprint module, the brightness and clarity of the fingerprint image recognized based on the third linear polarized light can be improved, the accuracy of fingerprint recognition can be improved, and accurate fingerprint recognition can be achieved while the display screen is set to a circularly polarized light display screen.

[0057] In one possible implementation, the under-screen optical fingerprint module includes a filter that can filter out light with a wavelength outside a wavelength threshold range.

[0058] Figure 4 is a schematic diagram of light transmittance of different fingers provided in an embodiment of the present application, such as Figure 4 As shown, Figure 4 The horizontal axis is used to represent the wavelength of light, and the vertical axis is used to represent the intensity of light. Figure 4 Different curves in the figure correspond to fingers of different widths. When different fingers are illuminated by strong light in the external environment, light with a longer wavelength can more easily penetrate the finger. Therefore, the under-screen optical fingerprint module is provided with a filter. The filter can filter out light with a wavelength outside the wavelength threshold range, that is, it does not allow light with a wavelength outside the wavelength threshold range to enter the under-screen optical fingerprint module. Taking the wavelength threshold range of [400nm, 500nm] in the above embodiment as an example, Figure 4 It can be seen that the light of [400nm, 500nm] in the external ambient light cannot penetrate the finger and enter the display screen. After the filter filters out the light with wavelengths outside [400nm, 500nm], only the light with a wavelength of [400nm, 500nm] reflected back by the finger is incident on the under-screen optical fingerprint module, which can prevent the influence of ambient light on fingerprint recognition.

[0059] In an embodiment of the present application, the under-screen optical fingerprint module includes a filter, which can filter out light with a wavelength outside the wavelength threshold range, thereby preventing the ambient light of the external environment from affecting the fingerprint recognition process of the under-screen optical fingerprint module, and allowing the under-screen optical fingerprint module to only receive the third linear polarized light reflected back by the object to be identified, thereby improving the accuracy of fingerprint recognition.

[0060] Figure 5 is a schematic diagram of an electronic device provided in an embodiment of the present application, such as Figure 5 As shown, the electronic device 400 includes the display screen 100 in any of the above embodiments, and the under-screen optical fingerprint module 300 in any of the above embodiments. The under-screen optical fingerprint module 300 is arranged below the display screen 100, that is, arranged in the housing of the display screen 100 and the electronic device 400.

[0061] In an embodiment of the present application, the electronic device 400 includes a display screen 100 and an under-screen optical fingerprint module 300. The display screen 100 uses a circularly polarized light display screen 100. The under-screen optical fingerprint module 300 can perform fingerprint recognition based on at least part of the third linear polarized light reflected by the object to be identified, which can realize under-screen optical fingerprint recognition while reducing the user's visual fatigue.

[0062] It should be pointed out that, according to the needs of implementation, the various components / steps described in the embodiments of the present application can be split into more components / steps, or two or more components / steps or partial operations of components / steps can be combined into new components / steps to achieve the purpose of the embodiments of the present application.

[0063] Those skilled in the art will appreciate that the units and method steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of this application.

[0064] The above implementation methods are only used to illustrate the embodiments of the present application, and are not intended to limit the embodiments of the present application. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the embodiments of the present application. Therefore, all equivalent technical solutions also fall within the scope of the embodiments of the present application, and the scope of patent protection of the embodiments of the present application should be defined by the claims.

Claims

1. A display screen, characterized in that: The display screen is arranged opposite to the under-screen optical fingerprint module, and the display screen includes: a cover plate, a first quarter glass sheet, a polarizer and a light-emitting layer; The first surface of the cover plate is used to provide a pressing surface. The first quarter glass is arranged between the first surface of the polarizer and the second surface of the cover plate. The second surface of the polarizer is opposite to the first surface of the light-emitting layer, and the second surface of the light-emitting layer is opposite to the under-screen optical fingerprint module. The light emitting layer is configured to emit fingerprint recognition light; The polarizer is configured to convert the fingerprint recognition light into a first linearly polarized light; The first quarter glass is configured to convert the second linearly polarized light in the first linearly polarized light whose wavelength is outside the wavelength threshold range into the first circularly polarized light, and to allow the third linearly polarized light in the first linearly polarized light whose wavelength is within the wavelength threshold range to pass directly; wherein, The under-screen optical fingerprint module performs fingerprint recognition based on at least a portion of the third linearly polarized light reflected by the object to be identified that is pressed on the pressing surface.

2. The display screen according to claim 1, wherein: The wavelength threshold range is [400 nm, 500 nm].

3. The display screen according to claim 1, wherein: The display screen further includes a second quarter glass, wherein the second quarter glass is disposed between the second surface of the polarizer and the first surface of the light-emitting layer; The second quarter glass is configured to convert the light reflected by the light emitting layer into fourth linear polarized light, so that the fourth linear polarized light cannot pass through the polarizer.

4. The display screen according to claim 3, wherein: The second quarter glass is configured to convert at least a portion of the third linearly polarized light reflected by the object to be identified into second circularly polarized light, so that the under-screen optical fingerprint module performs fingerprint identification based on the second circularly polarized light.

5. The display screen according to any one of claims 1 to 4, characterized in that: The light-emitting layer includes an OLED light-emitting layer.

6. An under-screen optical fingerprint module, characterized in that: The under-screen optical fingerprint module is arranged opposite to the display screen as described in any one of claims 1 to 5, and is constructed to perform fingerprint recognition based on at least part of the third linearly polarized light reflected by the object to be identified pressed on the pressing surface, wherein the third linearly polarized light is within a wavelength threshold range.

7. The under-screen optical fingerprint module according to claim 6, characterized in that: The aperture range of the under-screen optical fingerprint module is [F1.0, F2.0].

8. The under-screen optical fingerprint module according to claim 6, characterized in that: The exposure time range of the under-screen optical fingerprint module is [30ms, 100ms].

9. The under-screen optical fingerprint module according to claim 6, characterized in that: The under-screen optical fingerprint module includes a filter; The optical filter is configured to filter out light having a wavelength outside the wavelength threshold range.

10. An electronic device, characterized in that: It comprises a display screen as described in any one of claims 1 to 5 and an under-screen optical fingerprint module as described in any one of claims 6 to 9, wherein the under-screen optical fingerprint module is arranged between the display screen and the back cover of the electronic device.

Images