WO2020124370A1

WO2020124370A1 - Oled screen body, fingerprint recognition module and terminal device

Info

Publication number: WO2020124370A1
Application number: PCT/CN2018/121771
Authority: WO
Inventors: 许志高; 洪定洋
Original assignee: 深圳市柔宇科技有限公司
Priority date: 2018-12-18
Filing date: 2018-12-18
Publication date: 2020-06-25
Also published as: CN112639800A

Abstract

An OLED screen body (100), and a fingerprint recognition module and a terminal device comprising the OLED screen body (100). The OLED screen body (100) comprises: a light-emitting layer (10), which emits first emergent light (111) and second emergent light (112); a first polarizing layer (21) and a second polarizing layer (22), which are respectively arranged on two sides of the light-emitting layer (10); the second emergent light (112) does not transmit through the first polarizing layer (21), instead, it is reflected between internal layers of the OLED screen body (100) and then enters the second polarizing layer (22), and is attenuated under the action of the second polarizing layer (22). The second polarizing layer (22) can attenuate the second emergent light (112) reflected by each layer structure in the OLED screen body, and reduce the interference caused by the second emergent light (112) to the first emergent light (111). <b/>

Description

OLED screen, fingerprint recognition module and terminal equipment

Technical field

The present application relates to the technical field of light display, and in particular, to an OLED screen body, and a fingerprint recognition module and a terminal device including the OLED screen body.

Background technique

Organic Light-Emitting Diode (OLED) displays have excellent characteristics such as self-luminous, high contrast, thin thickness, wide viewing angle, and can be applied to flexible panels, so they have very good development prospects.

The OLED display has a thin-film stacked structure, has a very good light source, and has excellent display effects. The outgoing light source of the OLED display screen can be used as a working light source in optical photosensitive recognition. Inevitably, part of the light emitted by the light source in the OLED display screen reflected by each layer structure will enter the photosensitive element used for photosensitive identification, which will interfere with the photosensitive identification and affect the identification accuracy of the photosensitive element.

Summary of the invention

In view of this, the present application aims to provide an OLED screen body, a fingerprint recognition module and a terminal device, which can attenuate part of the light emitted by the light source reflected by each layer structure in the OLED display screen.

Therefore, the first aspect of the present application proposes an OLED screen, including:

The light emitting layer is used to generate outgoing light, and the outgoing light includes a first outgoing light and a second outgoing light;

A first polarizing layer provided on one side of the light-emitting layer; and

The second polarizing layer is provided on the other side of the light-emitting layer;

Wherein, the first outgoing light is transmitted toward the first polarizing layer, is reflected by a reflector outside the OLED screen, transmits the first polarizing layer again and then transmits the second polarizing layer; the second The outgoing light does not pass through the first polarizing layer, but is reflected by the inter-level reflection in the OLED screen body, then enters the second polarizing layer, and is attenuated by the second polarizing layer.

Optionally, the first polarizing layer includes a first 1/4 wave plate and a first linear polarizer, the first 1/4 wave plate is attached to the first linear polarizer, and the first A quarter wave plate is located between the first linear polarizer and the light emitting layer.

Optionally, the second polarizing layer includes a second 1/4 wave plate and a second linear polarizer, the second 1/4 wave plate is attached to the second linear polarizer, and the second 1 /4 wave plate is located between the second linear polarizer and the light-emitting layer, wherein the vibration direction of the light emitted by the first outgoing light through the second 1/4 wave plate and the second linear polarizer The direction of polarization is parallel.

Optionally, the light-emitting layer includes:

anode;

A cathode, including a bearing surface, and the first polarizing layer is disposed on the bearing surface;

An organic functional layer is stacked between the anode and the cathode, wherein the light emitting direction of the organic functional layer is directed from the organic functional layer to the cathode.

Optionally, the light emitting layer further includes a supporting layer, the supporting layer is disposed between the anode and the second polarizing layer, the second polarizing layer is attached to the supporting layer away from the anode side.

Optionally, the OLED screen body further includes a thin film transistor layer, the thin film transistor layer is disposed on a side of the anode away from the first polarizing layer, the thin film transistor layer and the anode are stacked for driving The light emitting layer.

Optionally, the OLED screen body further includes a touch layer, and the touch layer is disposed on a side of the first polarizing layer away from the cathode.

Based on the OLED screen of the first aspect described above, a second aspect of the present application proposes a fingerprint recognition module including a photosensitive element and the OLED screen, the photosensitive element being disposed on the second polarizing layer away from the light-emitting layer Side.

Optionally, the fingerprint identification module further includes an installation layer; the installation layer is attached to the OLED screen body, the installation layer defines a photosensitive hole, and the photosensitive element is installed in the photosensitive hole.

Optionally, the area of the second polarizing layer is larger than the opening area of the photosensitive hole.

Optionally, the OLED screen includes a fingerprint identification area; the photosensitive hole corresponds to the fingerprint identification area.

Optionally, the mounting layer is further provided with a light absorbing area, and the light absorbing area is used to absorb incident light.

Optionally, the light absorption area is provided along the periphery of the photosensitive hole.

Optionally, the light absorption area is a black coating or black plastic.

Based on the fingerprint identification module of the second aspect described above, a third aspect of the present application provides a terminal device including the fingerprint identification module.

In the OLED panel provided by the embodiment of the present application, the first polarizing layer is disposed on one side of the light emitting layer, the second polarizing layer is disposed on the other side of the light emitting layer, and the first outgoing light Transmitting to the first polarizing layer, reflecting by the reflector outside the OLED screen body, transmitting the first polarizing layer again and then transmitting the second polarizing layer; the second outgoing light does not transmit the first polarizing layer A polarizing layer is incident on the second polarizing layer after being reflected between the internal layers of the OLED screen, and is attenuated by the second polarizing layer. Therefore, it can prevent the second outgoing light from affecting the first The emitted light causes interference.

BRIEF DESCRIPTION

In order to explain the technical solutions of the embodiments of the present application more clearly, the drawings required in the embodiments of the present application will be briefly described below. Obviously, the drawings described below are only some embodiments of the present application. For a person of ordinary skill in the art, without paying any creative labor, other drawings can be obtained based on these drawings.

FIG. 1 is a schematic structural diagram of an OLED screen provided by one embodiment of this application;

2 is a schematic structural diagram of a first polarizing layer of the OLED screen shown in FIG. 1;

3 is a schematic structural diagram of a second polarizing layer of the OLED screen shown in FIG. 1;

4 is a schematic structural diagram of a fingerprint identification module provided by another embodiment of the present application;

FIG. 5 is a schematic structural diagram of a fingerprint identification module according to another embodiment of the present application.

The implementation, functional characteristics and advantages of the present application will be further described in conjunction with the embodiments and with reference to the drawings.

detailed description

In order to facilitate understanding of the present application, the present application will be described in more detail with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is expressed as "fixed" to another element, it may be directly on the other element, or there may be one or more centered elements in between. When an element is expressed as "connecting" another element, it may be directly connected to the other element, or one or more centered elements may be present therebetween. The terms "vertical", "horizontal", "left", "right", "inner", "outer", and similar expressions used in this specification are for illustrative purposes only, and only express the substantial positional relationship, For example, for "vertical", if a certain positional relationship is not strictly vertical because of achieving a certain purpose, but is substantially vertical, or utilizes the vertical characteristics, it belongs to the "vertical" category described in this specification.

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field of the present application. The terminology used in the description of this application is for the purpose of describing specific embodiments only, and is not intended to limit this application. The term "and/or" used in this specification includes any and all combinations of one or more related listed items.

It can be understood that, as shown in this document, the one or more interlayer substances involved in the embodiments of the present application, the positional relationship between the layers uses such terms as “lamination” or “formation” or “application” or “arrangement” To express ", those skilled in the art can understand that any term such as "lamination" or "formation" or "application" can cover all the methods, types and techniques of "lamination". For example, sputtering, electroplating, molding, chemical vapor deposition (Chemical Vapor Deposition, CVD), physical vapor deposition (Physical Vapor Deposition, PVD), evaporation, hybrid physical-chemical vapor deposition (Hybrid Physical-Chemical Vapor Deposition, HPCVD) , Plasma enhanced chemical vapor deposition (Plasma Enhanced Chemical Vapor Deposition (PECVD), low pressure chemical vapor deposition (Low Pressure Pressure Chemical Vapor Deposition (LPCVD), etc.

In addition, the technical features involved in different embodiments of the present application described below can be combined as long as they do not conflict with each other.

Referring to FIG. 1, the first aspect of the embodiment of the present application provides an OLED screen 100 including a light emitting layer 10, a first polarizing layer 21 and a second polarizing layer 22. The first polarizing layer 21 is disposed on one side of the light emitting layer 10, and the second polarizing layer 22 is disposed on the other side of the light emitting layer 10.

In some embodiments, the connection between the light-emitting layer 10, the first polarizing layer 21, and the second polarizing layer 22 may be fixed by optical glue, embedded by press-fit fixed connection, or by film coating, etc. Connection method.

The light-emitting layer 10 is used to generate outgoing light and provide an outgoing light source, so that the outgoing light source can be used in various scenes, so that the outgoing light source can be fully utilized. For example, the light emitted from the light-emitting layer 10 can be applied to a working light source in optical photosensitive recognition, or the light emitted from the light-emitting layer 10 can be applied to pixel display in image display, that is, the light-emitting layer 10 can be applied to The display shows, or the optical photosensitive recognition under the display.

It can be understood that the light source provided by the light-emitting layer 10 can also be applied to other optical technology fields. In the embodiment of the present application, the light-emitting layer 10 is a flexible OLED display screen applied in a display device, and an optical fingerprint recognition module under the OLED display screen.

In some embodiments, as shown in FIG. 1, the light-emitting layer 10 is used to generate emitted light. In this embodiment, the emitted light is divided into two parts according to the optical path of the emitted light, including the first emitted light 111 and the second出光光112. Wherein, the optical path of the first outgoing light 111 is: transmitted to the first polarized layer 21, reflected by a reflective object, such as a finger fingerprint, transmitted through the first polarized layer 21 again and then transmitted through the second polarized layer twenty two. The first outgoing light 111 reflected by the reflecting object outside the OLED screen 100 carries the optical signal of the reflecting object information, and is transmitted through the second polarizing layer 22 to be recognized by the photosensitive recognition element, that is, the first outgoing light 111 Used as a working light source. Then, the optical path of the second outgoing light 112 is: during the outgoing process, it is reflected by the internal layer structure in the light-emitting layer 10 or other layer structures inside the screen body, such as the cathode of the light-emitting layer 10, but not Transmitted through the first polarizing layer 21 and directly incident on the second polarizing layer 22, the light does not carry the optical signal of the reflective object information, and if it is directly incident into the photosensitive element, it will interfere with the photosensitive identification of the photosensitive element, In this embodiment, a second polarizing layer 22 is further provided under the light-emitting layer 10, and the second outgoing light 112 is attenuated by the second polarizing layer 22. Therefore, the OLED screen 100 can weaken the second outgoing light 112 and reduce the interference of the second outgoing light 112 to the first outgoing light 111.

In some embodiments, the light-emitting layer 10 uses organic light-emitting diode display technology, that is, OLED display technology.

Please continue to refer to FIG. 1. The light-emitting layer 10 includes an organic functional layer 11, a cathode 12 and an anode 13. The organic functional layer 11 is stacked between the cathode 12 and the anode 13 to emit light.

Optionally, the organic functional layer 11 is made of a matrix material doped with a certain proportion of organic light-emitting materials. When an external voltage is applied, holes of the anode 13 migrate to the organic functional layer 11, electrons of the cathode 12 migrate to the organic functional layer 11, and electrons and holes are at the organic functional layer 11 The encounter meets to form an electron-hole pair, and the electron transitions from the excited state to the ground state, releasing energy in the form of radiated photons, thereby generating electroluminescence. The organic light-emitting material can be selected from organic small molecule materials or organic polymer materials to achieve electroluminescence.

When an external voltage is applied to the cathode 12, electrons of the cathode 12 migrate to the organic functional layer 11. The cathode 12 may be made of aluminum, magnesium, silver, molybdenum, titanium or alloys thereof.

When an external voltage is applied to the anode 13, holes of the anode 13 migrate to the organic functional layer 11. The anode 13 may adopt a single-layer structure or a multi-layer structure. The anode 13 of a single-layer structure may include a metal layer having Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, or a mixture thereof. The anode of the multilayer structure may include a metal layer having Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, or a mixture thereof, and a transparent conductive oxide layer including a transparent conductive oxide material. The transparent conductive oxide material may include one or more of indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), and indium tin zinc oxide (ITZO). For example, the anode 13 of a multilayer structure may be configured as a three-layer structure including a first transparent conductive oxide layer, a metal layer, and a second transparent conductive oxide layer.

In some embodiments, the anode 13 has a single-layer structure, so that holes of the anode 13 can migrate to the organic functional layer 11 and form electron-hole pairs with electrons, thereby enabling the organic function Layer 11 emits light.

In the OLED display technology, the light-emitting layer 10 is composed of a plurality of functional layers into a stacked structure to have a light-emitting function, so as to provide an exit light source. The light-emitting layer 10 includes main body outgoing light and part outgoing light. The light emitted from the main body of the light-emitting layer 10 is determined by the light-emitting direction of the organic functional layer 11 of the light-emitting layer 10. Specifically, the organic functional layer 11 is used to emit light, and the emitted light repeatedly reflects or transmits light between the thin-film functional layers, and most of the light is transmitted along a specific light exit direction. For example, when the organic functional layer 11 faces the cathode 12, and the cathode 12 is a light-transmitting electrode, the light exit direction of the organic functional layer 11 is directed from the organic functional layer 11 to the cathode 12, and the Most of the light emitted from the organic functional layer 11 can transmit through the cathode 12, and the main body forming the light-emitting layer 10 emits light.

In some embodiments, part of the light emitted from the organic functional layer 11 is reflected between multiple functional layers, and then emitted in another direction to form part of the exit light, for example, the part of the exit light is away from the organic functional layer 11 The light exit direction of the light, or obliquely along the extension direction of the functional layer. In particular, when the light exiting direction of the organic functional layer 11 is directed from the organic functional layer 11 to the cathode 12, part of the light emitted from the organic functional layer 11 deviates from the cathode under the reflection of the cathode 12 The light emitting direction of the organic functional layer 11 is emitted.

In the embodiment of the present application, the light-emitting layer 10 provides an outgoing light source, including the main body outgoing light and part of the outgoing light, because the main body outgoing light is the majority of the light source, and part of the outgoing light is the small part of the light source, in order to make full use of the main body outgoing light In order to reduce the interference caused by part of the outgoing light to the outgoing light of the main body, an OLED screen 100 is proposed.

Further, the first polarizing layer 21 and/or the second polarizing layer 22 are circular polarizing layers, and the first polarizing layer 21 and the second polarizing layer 22 are arranged symmetrically. In some embodiments, please refer to FIG. 2, the first polarizing layer 21 includes a stacked first linear polarizer 21 a and a first 1/4 wave plate 21 b, the first 1/4 wave plate 21 b and all The first linear polarizer 21a is attached, and the first quarter-wave plate 21b is located between the first linear polarizer 21a and the light-emitting layer 10, that is, the first polarizer layer 21 A linear polarizer 21a is disposed away from the light-emitting layer 10.

Please continue to refer to FIG. 3, the second polarizing layer 22 includes a second linear polarizer 22a and a second quarter-wave plate 22b stacked, the second quarter-wave plate 22b and the second linear polarizer 22a And the second quarter wave plate 22b is located between the second linear polarizer 22a and the light emitting layer 10, that is, the second linear polarizer 22a of the second polarizing layer 22 is far away from the light emitting Layer 10 settings.

Optionally, part of the light emitted from the main body of the light-emitting layer 10 is the first emitted light 111, and the first emitted light 111 sequentially passes through the first quarter wave plate 21b of the first polarizing layer 21 1. A first linear polarizer 21a, the first outgoing light 111 is reflected by a reflective object (such as a fingerprint of a finger), and sequentially transmits the first linear polarizer 21a and the first 1/4 of the first polarizing layer 21 in turn The wave plate 21b forms circularly polarized light, and the circularly polarized light transmits the second quarter wave plate 22b of the second polarizing layer 22, thereby forming linearly polarized light whose vibration direction is the same as that of the second The polarization directions of the second linear polarizer 22a of the polarizing layer 22 are parallel, so that the linearly polarized light transmits the second linear polarizer 22a of the second polarizing layer 22 and keeps the light energy from being lost. However, part of the light emitted from the light-emitting layer 10 is the second exit light 112, and the second exit light 112 is not transmitted by the first polarizing layer 21 and directly enters the second polarizing layer 22 Of the second quarter wave plate 22b and the second linear polarizer 22a, so that the light is absorbed by the second quarter wave plate 22b and the second linear polarizer 22a of the second polarizing layer 22, resulting in serious loss of light energy, Wherein, the incident light in the second outgoing light 112 whose vibration direction is not parallel to the polarization direction of the second linear polarizer 22a will be absorbed, resulting in serious energy loss of the second outgoing light 112. Therefore, the first outgoing light 111 in the embodiment of the present application can be better used for fingerprint identification in optical fingerprint photorecognition, and at the same time, the second outgoing light 112 is prevented from causing interference to the first outgoing light 111 In order to improve the accuracy and clarity of optical fingerprint photorecognition.

It is understandable that other light path structures can still be added to the structure of the OLED screen 100 to change the light path in the OLED screen 100, and certain light paths are selected as the first outgoing light 111 to fully The light source of the OLED screen 100 is used.

In some embodiments, please continue to refer to FIG. 1, the light emitting direction of the organic functional layer 11 is configured to point from the organic functional layer 11 to the cathode 12, that is, the main body of the light emitting layer 10 emits light from the organic The functional layer 11 points to the cathode 12. The first polarizing layer 21 is disposed on the side of the cathode 12 away from the organic functional layer 11, and the second polarizing layer 22 is disposed on the side of the anode 13 away from the organic functional layer 11, wherein the The first linear polarizer 21a of the first polarizing layer 21 is disposed away from the organic functional layer 11 side; the second linear polarizer 22a of the second polarizing layer 22 is disposed away from the organic functional layer 11 side.

In some embodiments, referring to FIG. 4, the light-emitting layer 10 further includes a support layer 131. The supporting layer 131 is provided with the anode 13 on one side and the second polarizing layer 22 on the other side. The supporting layer 131 is provided between the anode 13 and the second polarizing layer 22. The cathode 12 includes a bearing surface, and the first polarizing layer 21 is disposed on the bearing surface. Wherein, the organic functional layer 11 is stacked between the anode 13 and the cathode 12 for light emission.

It can be understood that the OLED screen 100 further includes a thin film transistor layer (not shown), the thin film transistor layer is disposed on a side of the anode 13 away from the first polarizing layer 21, the thin film transistor layer The anode 13 is stacked to drive the light-emitting layer 10. Specifically, the thin film transistor layer is electrically connected to the anode 13 to drive the organic functional layer 11 to emit light. It is understandable that the structure of the thin film transistor layer and how to scan and drive the organic functional layer 11 on the anode 13 to emit light are understood by those skilled in the art.

In some embodiments, please continue to refer to FIG. 4, the light emitting layer 10 further includes a thin film encapsulation layer 121, the thin film encapsulation layer 121 is stacked on the cathode 12, and is located between the cathode 12 and the first polarized light Between floors 21. The thin film cover layer 121 is used to encapsulate and protect the metal and metal alloy of the cathode 12, thereby prolonging the service life.

In some embodiments, please continue to refer to FIG. 4. The OLED screen 100 further includes a touch layer 14. The touch layer 14 is disposed on a side of the first polarizing layer 21 away from the cathode 12. The touch layer 14 can be in contact with the fingerprint of the user's finger to enable optical fingerprint identification. The touch layer 14 can enhance the use performance of the OLED screen 100, so that the OLED screen 100 can not only have a superior display effect, but also can perform human-computer interaction to enhance the product experience.

It can be understood that the OLED screen 100 may further include other film layers to improve the light output or display effect of the OLED screen 100 so as to be applicable to more application scenarios. For example, an electron injection layer and an electron transport layer may be provided between the cathode 12 and the organic functional layer 11, and a hole injection layer and a hole injection layer may also be provided between the anode 13 and the organic functional layer 11. Hole transport layer.

Please refer to FIGS. 4 and 5 together. Based on the OLED screen 100 described above, a second aspect of the embodiments of the present application provides a fingerprint recognition module including a photosensitive element 200 and the OLED screen 100. The photosensitive element 200 cooperates with the OLED screen 100 to form the fingerprint identification module. Optionally, the light emitted from the main body of the light-emitting layer 10 of the OLED screen 100 is used as the induction light source of the photosensitive element 200, that is, the first exit light 111 is used as the induction light source of the photosensitive element 200. Wherein, the photosensitive element 200 may be embedded in the OLED screen 100 or be attached to the OLED screen 100. The OLED screen 100 and the photosensitive element 200 can be fixed by embedding, pressing or optically bonding. Optionally, the OLED screen 100 and the photosensitive element 200 can be fixed by optical glue Fit and fix.

The OLED screen 100 includes the light-emitting layer 10, the first polarizing layer 21 and the second polarizing layer 22. The first polarizing layer 21 is disposed on one side of the light-emitting layer 10, and the second polarizing layer 22 is disposed on the other side of the light-emitting layer 10, and is disposed opposite to the first polarizing layer 21. The light-emitting layer 10 includes the organic functional layer 11, the cathode 12 and the anode 13. The organic functional layer 11 is stacked between the cathode 12 and the anode 13 to emit light.

In some embodiments, the light emitted from the light-emitting layer 10 includes main body light and part of the light, and part of the light emitted from the body of the light-emitting layer 10 is the first light 111, and the light-emitting layer The partial light of the partial outgoing light of 10 is the second outgoing light 112. The first exiting light 111 is used as a working light source of the fingerprint identification module. The first exiting light 111 is transmitted toward the first polarizing layer 21, reflected by a reflective object (such as a fingerprint of a user's finger), and transmitted again After the first polarizing layer 21, the light can transmit through the second polarizing layer 22; the second outgoing light 112 is not transmitted by the first polarizing layer 21, and is reflected by the inter-layers inside the OLED screen 100 , Incident on the second polarizing layer 22, attenuated by the second polarizing layer 22, and the optical energy loss is severe. The photosensitive element 200 is disposed on the side of the second polarizing layer 22 away from the light-emitting layer 10, and performs photo-recognition on the first emitted light 111 to enable photo-recognition of fingerprints.

In some embodiments, as shown in FIG. 4, the photosensitive element 200 may be attached to the OLED screen 100, and optionally, the photosensitive element 200 may be fixedly attached to the second polarizing layer 22 by optical glue .

In some embodiments, please continue to refer to FIG. 5, the photosensitive element 200 is installed and matched with the OLED screen 100 through the mounting layer 210. The mounting layer 210 defines a photosensitive hole 211, and the photosensitive element 200 is installed in the photosensitive hole 211. Specifically, the second polarizing layer 22 of the OLED screen 100 is attached to and fixedly connected to the mounting layer 210 by optical glue.

The OLED screen 100 provides the first outgoing light 111 as a working light source of the fingerprint identification module. The first outgoing light 111 is reflected by the fingerprint of the user’s finger, and the light carrying the fingerprint information sequentially transmits through the first polarizing layer 21 and the second polarizing layer 22, and is detected and recognized by the photosensitive element 200. The photosensitive element 200 determines the texture information of the finger according to the light intensity of the light, thereby enabling fingerprint recognition.

It can be understood that the area of the second polarizing layer 22 can be set according to actual conditions. For example, the second polarizing layer 22 has a larger opening area than the photosensitive hole 211 to cover the photosensitive hole 211 Or, the second polarizing layer 22 is the same size as the OLED screen 100. When the second polarizing layer 22 can cover the photosensitive hole 211, the production process and assembly of the second polarizing layer 22 can be simplified, and the production cost can be saved, but the second polarizing layer 22 has a small coverage area, which only Part of the second outgoing light 112 is absorbed, and the rest of the second outgoing light 112 may be reflected into the photosensitive element 200 by multiple reflection oscillations to cause photosensitive interference. When the second polarizing layer 22 is the same size as the OLED screen 100, the second polarizing layer 22 covers a large area, which absorbs most of the second outgoing light 112 to prevent the second outgoing light The reflected light 112 reflects and oscillates multiple times and falls into the photosensitive element 200 to avoid causing photosensitive interference. Therefore, those skilled in the art should select the area size of the second polarizing layer 22 according to actual needs.

In some embodiments, the first polarizing layer 21 is disposed opposite to the second polarizing layer 22, and the incident light area of the second polarizing layer 22 is greater than or equal to the incident light area of the first polarizing layer 21 In order to ensure that the second outgoing light 112 can fall into the second polarizing layer to be absorbed and attenuated, to prevent the second outgoing light 112 from reflecting and oscillating multiple times and falling into the photosensitive element 200.

Please continue to refer to FIG. 5. In order to further reduce the light interference of the second outgoing light 112 to the photosensitive element 200, in some embodiments, the mounting layer 210 is further provided with a light absorption area 212, the light absorption Zone 212 can absorb incident light. The light absorbing area 212 absorbs incident light to prevent the incident light from further reflecting and oscillating multiple times and falling into the photosensitive element 200 to avoid photosensitive interference. Further, the light absorption area 212 is provided along the peripheral edge of the photosensitive hole 211, so that the incident light in the peripheral area of the photosensitive hole 211 is absorbed in time to avoid photosensitive interference. Optionally, the light absorption area 212 is a black coating or black plastic to enable light absorption effect. It can be understood that, the light absorption region 212 may also use other extinction materials to have a good light absorption effect.

It can be understood that the OLED screen 100 further includes a fingerprint recognition area. The photosensitive hole 211 corresponds to the fingerprint recognition area on the OLED screen 100. The first exiting light 111 is used as the working light source of the photosensitive element 200, and the first exiting light 111 has the shortest path between the fingerprint recognition area of the OLED screen 100 and the photosensitive hole 211 to improve fingerprints Photosensitive recognition accuracy and clarity.

Understandably, in order to make full use of the first exit light 111 as a working light source, and to prevent the second exit light 112 from causing interference to the first exit light 111, the light emitting layer 10 and the second A light absorption layer is further provided between the polarizing layers 22, wherein the light absorption layer is provided with a via hole corresponding to the position of the photosensitive hole 211. The light absorbing layer can absorb the second outgoing light 112 to avoid multiple reflections and oscillations between layers and fall into the photosensitive element 200 to interfere with the first outgoing light 111 The photosensitive reaction on the photosensitive element 200 causes problems such as inaccurate photosensitive recognition and unclear photosensitive recognition.

Based on the above fingerprint identification module, a third aspect of the embodiments of the present application provides a terminal device including the fingerprint identification module. The terminal device includes, but is not limited to, smart identification control devices such as smart phones, tablet computers, PC-side computers, and smart TVs.

In the technical solution of the present application, the OLED screen 100 can make full use of the light emitted from the main body of the light-emitting layer 10, such as the first light emitted 111, in particular, the first light emitted 111 can be applied to optical photosensitive recognition Technology area. At the same time, the OLED screen 100 can also avoid part of the light emitted from the light-emitting layer 10, such as the second exit light 112, causing interference to the first exit light 111, thereby improving the first exit light The quality of use of 111.

In the above technical solution of the fingerprint identification module, the first emitted light 111 of the OLED screen 100 is used as a working light source in fingerprint photorecognition, and the advantages of the OLED screen 100 are fully utilized. The quality of the light source is good and the screen is soft With the advantages of thin thickness and the like, the photosensitive element 200 is installed under the OLED screen 100. In addition, the OLED screen 100 can prevent the second outgoing light 112 of the light emitting layer 10 from causing interference to the use of the first outgoing light 111.

The above-mentioned embodiments are exemplary embodiments of the present application, but the embodiments of the present application are not limited by the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, changes, modifications, substitutions, combinations, etc. made without departing from the spirit and principles of the present application Simplified, all should be equivalent replacement methods, all included in the scope of protection of this application.

Claims

An OLED screen is characterized by comprising:

The light emitting layer is used to generate outgoing light, and the outgoing light includes a first outgoing light and a second outgoing light;

A first polarizing layer provided on one side of the light-emitting layer; and

The second polarizing layer is provided on the other side of the light-emitting layer;

Wherein, the first outgoing light is transmitted toward the first polarizing layer, is reflected by a reflector outside the OLED screen, transmits the first polarizing layer again and then transmits the second polarizing layer; the second The outgoing light does not pass through the first polarizing layer, but is reflected by the inter-level reflection in the OLED screen body, then enters the second polarizing layer, and is attenuated by the second polarizing layer.
An OLED panel according to claim 1, wherein the first polarizing layer includes a first 1/4 wave plate and a first linear polarizer, the first 1/4 wave plate and the The first linear polarizer is attached, and the first quarter-wave plate is located between the first linear polarizer and the light-emitting layer.
An OLED panel according to claim 2, wherein the second polarizing layer includes a second 1/4 wave plate and a second linear polarizer, the second 1/4 wave plate and the first Two linear polarizers are bonded together, and the second 1/4 wave plate is located between the second linear polarizer and the light-emitting layer, wherein the first exit light transmits the second 1/4 wave The vibration direction of the light of the sheet is parallel to the polarization direction of the second linear polarizer.
An OLED screen according to any one of claims 1 to 3, wherein the light emitting layer comprises:

anode;

A cathode, including a bearing surface, and the first polarizing layer is disposed on the bearing surface;

An organic functional layer is stacked between the anode and the cathode, wherein the light emitting direction of the organic functional layer is directed from the organic functional layer to the cathode.
An OLED panel according to claim 4, wherein the light emitting layer further comprises a supporting layer, the supporting layer is disposed between the anode and the second polarizing layer, the second polarizing light The layer is attached to the side of the support layer away from the anode.
The OLED screen body according to claim 5, wherein the OLED screen body further includes a thin film transistor layer, the thin film transistor layer is disposed on a side of the anode away from the first polarizing layer, The thin film transistor layer and the anode are stacked to drive the light emitting layer.
An OLED screen body according to any one of claims 1 to 6, wherein the OLED screen body further comprises a touch layer, the touch layer is disposed on the first polarizing layer away from the cathode Side.
A fingerprint recognition module, characterized in that it includes a photosensitive element and the OLED screen according to any one of claims 1 to 7, wherein the photosensitive element is disposed on a side of the second polarizing layer away from the light-emitting layer side.
The fingerprint identification module according to claim 8, wherein the fingerprint identification module further comprises an installation layer; the installation layer is attached to the OLED screen body, and the installation layer is provided with a photosensitive hole. The photosensitive element is installed in the photosensitive hole.
The fingerprint identification module according to claim 9, wherein the area of the second polarizing layer is larger than the opening area of the photosensitive hole.
A fingerprint identification module according to claim 9, wherein:

The OLED screen includes a fingerprint recognition area;

The photosensitive hole corresponds to the fingerprint identification area.
The fingerprint identification module according to claim 9, wherein the mounting layer is further provided with a light absorbing area, and the light absorbing area is used to absorb incident light.
The fingerprint identification module according to claim 12, wherein the light absorption area is provided along the periphery of the photosensitive hole.
The fingerprint identification module according to claim 13, wherein the light absorption area is a black coating or black plastic.
A terminal device, characterized by comprising the fingerprint identification module according to any one of claims 8 to 14.