CN111241954A

CN111241954A - Display panel and electronic device

Info

Publication number: CN111241954A
Application number: CN202010006298.2A
Authority: CN
Inventors: 牛文骁; 刘练彬; 梁恒镇
Original assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Priority date: 2020-01-03
Filing date: 2020-01-03
Publication date: 2020-06-05

Abstract

The application discloses a display panel and an electronic device. The electronic device comprises a display panel, wherein the display panel comprises a display module and a fingerprint module; the display module comprises a plurality of pixel units, and the pixel units form a display array; the fingerprint module comprises a plurality of photosensitive pixel points which form a photosensitive array; wherein, the line direction of the display array and the line direction of the fingerprint module have an included angle which is not zero. The light beam emitted by the display panel comprises two parts, namely a display light beam directly reaching the fingerprint module and a target light beam reaching the fingerprint module after being reflected; stagger the setting with the display array in the display module assembly and the sensitization array in the fingerprint module assembly, avoid showing light beam and target beam stack formation mole line, guaranteed the fingerprint module assembly and pointed fingerprint identification's of user precision.

Description

Display panel and electronic device

Technical Field

The application relates to the field of intelligent display, in particular to a display panel and an electronic device.

Background

With the progress of science and technology, the technology of unlocking the finger print under the screen is widely applied, and the screen occupation ratio of the electronic device can be increased by unlocking the finger print under the screen, so that the finger print under the screen is more and more popular among users. The fingerprint module is arranged below the display module, so that the influence on normal display of the electronic device is avoided. When the user used the function of fingerprint unblock under the screen, the user need press the finger in appointed area, and the partial light beam of sending of display module assembly reaches user's finger part to the direction transmission of keeping away from the fingerprint module assembly, through the reflection to the direction transmission that is close to the fingerprint module assembly again. Through the light of reflection and the direct frequency that sends through the display module assembly, to the light that is close to the transmission of fingerprint direction be close, produce the mole line that does not have regularity after the stack on the fingerprint module assembly. Because the fingerprint module is discerned through the light and shade stripe to its receipt, the precision that fingerprint identification can greatly be disturbed in the existence of mole stripe to influence fingerprint identification's precision.

Disclosure of Invention

The application provides a display panel and an electronic device, which can avoid the generation of Moire patterns as much as possible.

According to a first aspect of the present application, there is provided a display panel including:

the display module comprises a plurality of pixel units, and the pixel units form a display array;

the fingerprint module comprises a plurality of photosensitive pixels, and the photosensitive pixels form a photosensitive array;

and an included angle which is not zero exists between the row direction of the display array and the row direction of the fingerprint module.

Further, the included angle is equal to or greater than 10 ° and equal to or less than 45 °.

Furthermore, the display panel further comprises a circuit board, and the circuit board is arranged between the display module and the fingerprint module;

set up the first unthreaded hole that runs through on the circuit board, first unthreaded hole covers along the ascending projection in direction of height fingerprint module along the ascending projection in direction of height.

Further, the first light through hole is rectangular;

an included angle between one group of opposite sides of the rectangle and the row direction of the display array is a first included angle, and an included angle between the row direction of the display array and the row direction of the fingerprint module is a second included angle;

the first included angle is equal to the second included angle.

Further, the shape of first logical unthreaded hole with the shape of fingerprint module is the same.

Further, the shape of the first light through hole is circular.

Furthermore, the display panel further comprises a heat dissipation layer, and the heat dissipation layer is arranged between the display module and the circuit board;

and a penetrating second light through hole is formed in the heat dissipation layer, the shape of the second light through hole is the same as that of the first light through hole, and the projection of the first light through hole in the height direction covers the projection of the second light through hole in the height direction.

Further, the display panel further comprises a polarizer, and the polarizer is arranged on one side of the display module, which is far away from the fingerprint module;

part of the light emitted by the display module passes through the polaroid and moves towards the direction far away from the fingerprint module, and after the light is reflected by the outside, the light passes through the polaroid and moves towards the direction close to the fingerprint module to form a target light beam, and the direction of the target light beam has components in the row direction of the photosensitive array.

Furthermore, the display panel further comprises a touch screen module, wherein the touch screen module comprises a conductor, and the conductor is in a grid shape;

and an included angle which is not zero exists between the row direction of the electric conductor and the row direction of the fingerprint module.

According to a second aspect of the present application, an electronic device is provided, which includes the above-mentioned display panel.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

the light beam that the display module assembly sent includes two parts, and partly is direct to the direction transmission near the fingerprint module assembly to reach the fingerprint module assembly, this part light beam is as showing the light beam, and another part is to keeping away from the direction transmission of fingerprint module assembly, after reacing user's finger department, through the reflection to being close to the direction transmission of fingerprint module assembly, this part light beam forms the target beam. Through the arrangement, the display array in the display module and the photosensitive array in the fingerprint module are arranged in a staggered manner, so that the display light beams and the target light beams are prevented from being superposed to form moire patterns; because the fingerprint of finger has peculiar unsmooth shape to make eye beam portability fingerprint information, avoid the production of mole line, can guarantee the accurate fingerprint information who receives target beam and carry of fingerprint module, light and shade stripe distribution condition promptly, thereby promoted the fingerprint module and pointed fingerprint identification's of user precision.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

Fig. 1 is a schematic plan view of an electronic device according to an embodiment of the present application.

Fig. 2 is a schematic cross-sectional structure diagram of a display panel according to an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a fingerprint module according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of a circuit board according to an embodiment of the present application.

FIG. 5 is a schematic diagram of a Moire pattern formed on a fingerprint module in a display panel.

Fig. 6 is a diagram of a pattern formed on a fingerprint module in a display panel according to an embodiment of the present application.

Description of the reference numerals

Display panel 10

Electronic device 20

Display module 100

The row direction 110 of the display array

Fingerprint module 200

Photosensitive pixel 201

Wiring board 300

Copper leakage region 310

Grid copper 320

Connector 330

First light passing hole 340

Heat dissipation layer 400

Second light passing hole 410

Touch screen module 500

Polarizer 600

Protective layer 700

Light passing channel 800

Outer frame 900

First included angle α

Second included angle β

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, 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.

It should be understood that the terms "first," "second," and the like as used in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

The embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

As shown in fig. 1 and 2, an embodiment of the present application provides a display panel 10, and the display panel 10 can be applied to an electronic device 20. The electronic device 20 may be a flexible electronic device, and of course, the electronic device 20 may also be an electronic device that is not deformable or bendable. For example: cell phones, computers, displays on watches, electronic books, etc.

In the present embodiment, the electronic device 20 is a mobile phone with a smart display function. The display panel 10 is an OLED display panel, and of course, in other embodiments, the display panel 10 may also be an LCD display panel or other types of display panels.

As shown in fig. 2, the display panel 10 of the present embodiment includes a display module 100 and a fingerprint module 200. The display module 100 includes a plurality of pixel units (not shown), each of which can emit light to realize intelligent display of the display panel 10. A plurality of pixel units are arranged and form a display array. The fingerprint module 200 includes a plurality of photosensitive pixels 201, and each photosensitive pixel 201 can receive a light beam (see fig. 3). A plurality of photosensitive pixels 201 are arranged to form a photosensitive array. Wherein, there is an included angle that is not zero between the row direction of the display array and the row direction of the fingerprint module 200.

When the display panel 10 is an OLED display panel, each pixel unit includes at least an organic light emitting diode including an anode, a cathode, and an organic light emitting layer between the anode and the cathode. In the organic light emitting diode, holes and electrons from an anode and a cathode, respectively, migrate to an organic light emitting layer, so that light is emitted from the organic light emitting layer to display an image. The plurality of pixel units form a display array to realize smart display of the display panel 10.

When the display panel 10 is an LCD display panel, each pixel unit at least includes an upper substrate, a lower substrate, a liquid crystal layer between the upper substrate and the lower substrate, and a thin film transistor. And driving an electric field generated between the upper substrate and the lower substrate of the liquid crystal layer to display an image. The electric field generated between the upper substrate and the lower substrate is changed by the signal and the voltage on the thin film transistor, so that the display effect of each pixel unit is controlled. The plurality of pixel units are arranged to form a display array to realize intelligent display of the display panel 10.

In the use, when the user need carry out fingerprint identification, display module assembly 100 is luminous. The light beam emitted by the display module 100 includes at least two portions. A part light beam is direct to the direction transmission that is close to fingerprint module 200 to reach fingerprint module 200, this part light beam is as showing light beam. Another part of the light beam is emitted in the direction far away from the fingerprint module 200, and after reaching the finger of the user, the light beam is reflected by the finger and emitted in the direction close to the fingerprint module 200 again, the light path of the part of the light beam is shown by the dotted line in fig. 2, and the part of the light beam forms the target light beam after being reflected.

In the conventional design, the display module 100 and the fingerprint module 200 are disposed correspondingly, that is, the row direction of the display array is the same as the row direction of the photosensitive array, and the column direction of the display array is the same as the column direction of the photosensitive array. The fingerprint of the finger has a characteristic concavo-convex shape so that the object beam can carry fingerprint information. Because the direction of the display beam that the pixel unit in the display array sent is the same with the sensitization array on the fingerprint module 200 to make the display beam that the frequency that fingerprint module 200 received is close and carry the target beam stack of fingerprint information form mole line on fingerprint module 200 easily. Through experiments, it can be known that the pattern of the moire pattern formed on the fingerprint module 200 can be referred to as fig. 5. Fingerprint module 200 receives the mole line pattern of irregularity, can't discern the fingerprint information that carries in object beam and the object beam from to influence fingerprint module 200 to user fingerprint identification's accuracy.

In this embodiment, the display array in the display module 100 and the photosensitive array in the fingerprint module 200 are staggered, so that the directions of the display beams emitted by the pixel units in the display array and the photosensitive array on the fingerprint module 200 are different. Avoid showing light beam and target beam and overlap on fingerprint module 200's the photosensitive array and form the mole line, the pattern that forms on the fingerprint module 200 can refer to fig. 6 and show. Through the aforesaid setting, guarantee the distribution of the light and shade stripe that fingerprint module 200 received clear to guarantee that fingerprint module 200 is accurate receives the fingerprint information that the target beam carried, and then promoted fingerprint module 200 and pointed fingerprint identification's precision to the user.

The fingerprint recognition may be used for screen unlocking, operation of turning on or off the display panel 10, fingerprint payment, and the like. In the operation process, the display module 100 of the display panel 10 needs to be kept in a light-emitting state, so that the light emitted by the display panel 10 can reach the finger of the user, and then reaches the fingerprint module 200 through reflection, so that the fingerprint module 200 can identify the fingerprint information of the user.

As shown in fig. 2, in the present embodiment, the display panel 10 further includes a circuit board 300, a heat dissipation layer 400, a touch screen module 500, a polarizer 600, a protection layer 700, and a frame 900. The frame 900 may support the circuit board 300, the heat dissipation layer 400, the touch screen module 500, the polarizer 600, and the protection layer 700.

The circuit board 300 is disposed between the fingerprint module 200 and the display module 100 to prevent the metal material in the circuit board 300 from affecting the display effect of the display panel 10. The wiring board 300 includes a copper drain region 310, a copper grid 320, and a connector 330 (shown with reference to fig. 4). In this embodiment, the circuit board 300 is a flexible circuit board, and of course, in other embodiments, the circuit board 300 may also be other types of circuit boards.

Set up the first unthreaded hole 340 that passes through on the circuit board 300, first unthreaded hole 340 covers the projection of fingerprint module 200 along the ascending projection of direction of height H. Through setting up first logical unthreaded hole 340 for the target beam can reach fingerprint module 200 through first logical unthreaded hole 340, thereby makes fingerprint module 200 can discern corresponding fingerprint information. Simultaneously, make first clear aperture 340 cover along the ascending projection in direction of height indicate fingerprint module 200 along the ascending projection in direction of height, can guarantee the sufficiency of target beam, promote fingerprint identification's accuracy.

It should be noted that, the projection of the first light passing hole 340 along the height direction H covers the projection of the fingerprint module 200 along the height direction H, and may be that the projection of the fingerprint module 200 along the height direction H completely falls into the projection of the first light passing hole 340 along the height direction H, or the projection of the first light passing hole 340 along the height direction H completely falls into the projection of the fingerprint module 200 along the height direction H, or of course, at least a part of the projection of the first light passing hole 340 along the height direction H may overlap with at least a part of the projection of the fingerprint module 200 along the height direction H.

Referring to fig. 1-3, the first light-passing hole 340 is rectangular, an angle between one set of opposite sides of the rectangle and the row direction of the display array is a first angle α, an angle between the row direction 110 of the display array and the row direction of the photosensitive array is a second angle β, the first angle α is equal to the second angle β, it should be noted that, in this embodiment, the row direction 110 of the display array is a horizontal direction, in this embodiment, the first light-passing hole 340 and the fingerprint module 200 rotate in the same direction relative to the display module 100, and a projection of the first light-passing hole 340 in the height direction H completely falls into a projection of the fingerprint module 200 in the height direction H.

In this embodiment, the shape of the first light passing hole 340 is the same as that of the fingerprint module 200, and both are rectangular, and the size of the first light passing hole 340 is reduced in an equal ratio to that of the fingerprint module 200, and the central lines of the two coincide. Of course, in other embodiments, the size of the first light passing hole 340 may also be identical to the size of the fingerprint module. Through the above arrangement, the target beam reaching the display module 100 through the first light passing hole 340 is captured by the fingerprint module 200 as much as possible and used for fingerprint identification. Simultaneously, the shape of first logical unthreaded hole 340 and fingerprint module 200 in current technology is also the same, only need on current technology's basis change first logical unthreaded hole 340 set up the angle can, the simple operation.

Of course, in other embodiments, the first light passing hole 340 may have other shapes. For example, the following steps are carried out: the shape of the first light passing hole 340 may also be circular.

As shown in fig. 2, the heat dissipation layer 400 is disposed between the display module 100 and the circuit board 300. When the display panel 10 operates, the electronic components on the circuit board 300 operate to generate heat, and the pixel units in the display module 100 emit light to generate heat. By arranging the heat dissipation layer 400 on the display module 100 and the circuit board 300, the heat of the circuit board 300 and the display module 100 can be reduced when the display panel 10 works, so as to ensure the normal work of the two. Since the heat dissipation layer 400 is usually made of an opaque metal material to improve the heat exchange efficiency, the heat dissipation layer 400 needs to be provided with a second light through hole 410, so as to avoid the second light through hole 410 from shielding the light beam.

In the present embodiment, the shape of the second light passing hole 410 is the same as the shape of the second light passing hole 410, and the projection of the first light passing hole 340 in the height direction covers the projection of the second light passing hole 410 in the height direction. The first light passing hole 340 and the second light passing hole 410 form a communicating light passing channel 800 to ensure that the target beam smoothly passes through the light passing channel 800 to reach the fingerprint module 200.

The touch screen module 500 is disposed above the display module 100. Includes a transparent conductor (not shown) formed by an etching process, and the conductor is arranged in a grid pattern. When the light beam emitted by the display module 100 is emitted in a direction away from the fingerprint module 200, the light beam passes through the touch screen module 500, and a part of the light beam is reflected by the touch screen module 500. In this embodiment, there is a non-zero angle between the row direction of the conductive body and the row direction of the fingerprint module 200. Through the setting, can avoid producing the mole line by the light beam and the superposition of target beam of touch screen module 500 reflection on fingerprint module 200, promote fingerprint identification's accuracy.

The polarizer 600 is disposed on a side of the display module 100 away from the fingerprint module 200. In the present embodiment, the polarizer 600 is disposed above the touch screen module 500. The display panel 10 is an OLED display panel, and the polarizer 600 is a circular polarizer. Of course, in other embodiments, when the display panel 10 is an LCD display panel, the polarizer 600 is a linear polarizer.

The polarizer 600 includes 1/4 λ plate (abbreviated ND Film) and 1/2 λ plate (abbreviated PVA). In the present embodiment, the polarizer 600 has a polarization direction of 45 ° or 135 °. The optical axis of the 1/4 λ slide is a compensation axis with a direction of 0 °, and the optical axis of the 1/2 λ plate is an absorption axis with a direction of 45 ° or 135 °. The light beam emitted from the display module 100 and far away from the fingerprint module 200 reaches the finger of the user through the polarizer 600. In the process, the light beam firstly passes through the 1/4 lambda plate to form circular polarization light, and then passes through the 1/2 lambda plate to form linear polarization light. After reaching the user's finger, the light is reflected back through polarizer 600. In the process, the reflected light beam firstly passes through the 1/2 lambda plate in a linear polarization mode and then passes through the 1/4 lambda plate to form circular polarization. The partial light beams may form a certain angle of polarization after passing through the polarizer 600 twice. The partial beam has a component in the row direction of the photosensitive array. In other words, part of the light emitted from the display module 100 passes through the polarizer 600 and moves away from the fingerprint module 200, and after being reflected by the outside, passes through the polarizer 600 and moves towards the fingerprint module 200 to form the target beam, and the direction of the target beam has a component in the row direction of the photosensitive array. Through the arrangement, the accuracy of fingerprint identification can be improved by the photosensitive array. The brightness of the captured effective target light beam is guaranteed, and therefore accuracy of fingerprint identification is improved.

Meanwhile, the display panel 10 in this embodiment is an OLED display panel, and since the anode in the display module 100 is made of a metal material, when an external light beam enters the display panel 10, the external light beam is reflected outward by the anode made of the metal material, so that the external scene formed by reflection can be observed through the display panel 10. If the user observes an external scene through the display panel 10, the observation of the user on the picture displayed by the display module 100 itself is affected, and the contrast is reduced, so that the experience of the user is affected. Through setting up polaroid 600, can change the direction of the light beam of external entering to avoid external entering, get back to the external world again through polaroid 600 after the reflection, make the user at the in-process of using electron device, only can or only observe the light that display panel 10 sent as far as possible, promote the contrast, thereby promote user experience and feel.

Further, the polarisation direction of polaroid is 45 or 135 usually, show through a large amount of experiments, when polarisation direction is 45 or 135, the line direction of display array and the contained angle more than or equal to 10 between the line direction of fingerprint module to less than or equal to 45, first contained angle α and second contained angle β more than or equal to 10 promptly, and when less than or equal to 45, can guarantee that the luminance of the effectual object beam that photosensitive array can catch is higher, clear fingerprint information can be discerned to fingerprint module 200 promptly, thereby promote fingerprint identification's accuracy.

The protection layer 700 is disposed above the polarizer 600 to protect the polarizer 600, the touch screen module 500, the display module 100, the heat dissipation layer 400, the circuit board 300, and the fingerprint module 200, which are disposed below the protection layer, and to isolate interference from the outside to the components disposed below the protection layer 700.

Although the present application has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application, and all changes, substitutions and alterations that fall within the spirit and scope of the application are to be understood as being covered by the following claims.

Claims

1. A display panel, comprising:

2. The display panel according to claim 1, wherein the included angle is 10 ° or more and 45 ° or less.

3. The display panel of claim 1, wherein the display panel further comprises a circuit board disposed between the display module and the fingerprint module;

4. The display panel according to claim 3, wherein the first light passing hole has a rectangular shape;

the first included angle is equal to the second included angle.

5. The display panel of claim 4, wherein the first light through hole has a shape identical to that of the fingerprint module.

6. The display panel according to claim 3, wherein the first light passing hole has a circular shape.

7. The display panel of claim 3, wherein the display panel further comprises a heat dissipation layer disposed between the display module and the circuit board;

8. The display panel of claim 1, wherein the display panel further comprises a polarizer disposed on a side of the display module away from the fingerprint module;

9. The display panel of claim 1, wherein the display panel further comprises a touch screen module, wherein the touch screen module comprises conductors, and the conductors are in a grid shape;

10. An electronic device, characterized in that the electronic device comprises a display panel according to any one of claims 1-9.