CN115633520A - Display panel and display device - Google Patents

Abstract

The invention discloses a display panel and a display device. The display panel comprises a display area and a fingerprint identification area, and further comprises a substrate base plate, a functional device layer and a color film layer, wherein the functional device layer is arranged on one side of the substrate base plate and comprises a light-emitting device positioned in the display area and a photoelectric sensor positioned in the fingerprint identification area, and the photoelectric sensor is used for receiving light rays of the light-emitting device reflected by a finger so as to identify fingerprint information of the finger; the color film layer is positioned on one side of the functional device layer, which deviates from the substrate base plate, and comprises a first filter part, and the first filter part and the photoelectric sensor part are correspondingly arranged in the direction perpendicular to the substrate base plate. The invention reduces the requirement on the light transmittance of the display panel, reduces the response time of the photoelectric sensor and improves the recognition rate of the photoelectric sensor.

Description

Display panel and display device

Technical Field

The invention belongs to the technical field of display, and particularly relates to a display panel and a display device.

Background

An Organic Light Emitting Diode (OLED) is a current type Light Emitting device, and is widely used in display devices such as mobile phones and tablet computers due to its characteristics of self-luminescence, fast response, wide viewing angle, and being capable of being fabricated on a flexible substrate.

Fingerprint identification has become the important component of display device at present, and it has improved very big facility for the user in application scenes such as equipment unblock, mobile payment, and present fingerprint identification mainly has optical fingerprint identification, supersound fingerprint identification, capacitanc fingerprint identification, and wherein optical fingerprint identification has great advantage in convenience such as consumption, response speed, cost and is widely adopted. However, the response time of the traditional under-screen fingerprint identification is long at present, and the identification rate is reduced.

Disclosure of Invention

The invention aims to provide a display panel and a display device, and aims to solve the problem that the existing display panel is low in optical fingerprint identification efficiency.

The first aspect of the invention provides a display panel, which comprises a display area and a fingerprint identification area, and further comprises a substrate base plate, a functional device layer and a color film layer, wherein the functional device layer is arranged on one side of the substrate base plate and comprises a light-emitting device positioned in the display area and a photoelectric sensor device positioned in the fingerprint identification area, and the photoelectric sensor device is used for receiving light rays of the light-emitting device reflected by a finger so as to identify fingerprint information of the finger; the color film layer is positioned on one side of the functional device layer, which deviates from the substrate base plate, and comprises a first filter part, and the first filter part and the photoelectric sensor part are correspondingly arranged in the direction perpendicular to the substrate base plate.

In some embodiments, the first filter is a green filter;

preferably, the light emitting device includes a first sub light emitting device emitting light of a green color, a second sub light emitting device emitting light of a red color, and a third sub light emitting device emitting light of a blue color, and the photosensor device is disposed adjacent to the first sub light emitting device.

In some embodiments, an orthographic projection of the first filter on the substrate base is within an orthographic projection of the photo-sensor device on the substrate base;

preferably, an orthographic projection of the first filter on the substrate base plate coincides with an orthographic projection of the photoelectric sensing device on the substrate base plate.

In some embodiments, the color film layer further includes a second filter, and the second filter and the light emitting device are disposed correspondingly in a direction perpendicular to the substrate base plate;

preferably, an orthographic projection of the light emitting device on the base substrate is located within an orthographic projection of the second filter on the base substrate.

In some embodiments, the color film layer further includes a first light-shielding layer, the first light-shielding layer is respectively provided with a first via hole and a second via hole along a direction perpendicular to the substrate, the first light-filtering member is embedded in the first via hole, and the second light-filtering member is embedded in the second via hole.

In some embodiments, the functional device layer further includes a pixel defining layer, the pixel defining layer is respectively provided with a first opening and a second opening along a direction perpendicular to the substrate base plate, the photoelectric sensor device is located in the first opening, and the light emitting device is located in the second opening.

In some embodiments, the pixel defining layer is multiplexed into the second light shielding layer.

In some embodiments, the display panel further includes an array layer disposed between the substrate base plate and the functional device layer, the array layer including a first thin film transistor in the fingerprint identification region and a second thin film transistor in the display region, the first thin film transistor for driving the photoelectric sensing device, the second thin film transistor for driving the light emitting device.

In some embodiments, the display panel further comprises an encapsulation layer, the encapsulation layer being located between the functional device layer and the color film layer.

A second aspect of the present invention provides a display device including the display panel of any one of the above embodiments.

The functional device layer of the display panel comprises the light-emitting device positioned in the display area and the photoelectric sensor device positioned in the fingerprint identification area, and the light-emitting device and the photoelectric sensor device for identifying fingerprints are arranged in the functional device layer, so that the photoelectric sensor device is arranged in the display panel, the photoelectric sensor device is prevented from being arranged on the surface of the display panel, which is far away from the light-emitting side, the requirement on the light transmittance of the display panel is reduced, the response time of the photoelectric sensor is shortened, and the identification rate of the photoelectric sensor is improved. And display panel still includes that the color film layer is including being located the first filter spare that functional device layer deviates from substrate base plate one side, and first filter spare corresponds the setting with photoelectric sensor in the direction of perpendicular to substrate base plate, and first filter spare can restrain external light and to photoelectric sensor's optical crosstalk, has further reduced photoelectric sensor's response time, has improved photoelectric sensor's rate of identification.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic view of a display panel according to an embodiment of the present disclosure;

FIG. 2 is a cross-sectional view along AA of FIG. 1;

fig. 3 is a schematic cross-sectional view of a display panel according to an embodiment of the present disclosure;

fig. 4 is a partial schematic view of a display panel according to an embodiment of the present disclosure;

fig. 5 is another schematic cross-sectional view of a display panel according to an embodiment of the present disclosure.

The reference numbers are as follows:

a display panel 100; a display area AA; a fingerprint identification area NA; a base substrate 10; a functional device layer 20; a light emitting device 21; the first sub light emitting device 211; the second sub light emitting device 212; the third sub light emitting device 213; a photo-sensor device 22; a pixel defining layer 23; the first opening 231; a second opening 232; a color film layer 30; the first filter 31; a second filter 32; a first light-shielding layer 33; a first via hole 331; a second via 332; an array layer 40; a first thin film transistor 41; a first active layer 411; a first gate 412; the first source-drain electrode 413; a second thin film transistor 42; a second active layer 421; a second gate 422; a second source-drain electrode 423; and an encapsulation layer 50.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the described embodiments.

In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated for convenience in describing the invention and to simplify description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical, but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by the person skilled in the art that the described embodiments of the invention can be combined with other embodiments.

The following description is given with reference to the orientation words as shown in the drawings, and is not intended to limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

Fingerprint identification has become the important component of display device at present, and it has improved very big facility for the user in application scenes such as equipment unblock, mobile payment, and present fingerprint identification mainly has optical fingerprint identification, supersound fingerprint identification, capacitanc fingerprint identification, and wherein optical fingerprint identification has great advantage in convenience such as consumption, response speed, cost and is widely adopted. Traditional optics fingerprint identification is independent fingerprint module laminating at display panel's back usually, and its light transmissivity to display panel requires highly, and the integration of present display panel multiple functions leads to the light transmissivity to descend by a wide margin, leads to long, the rate of identification reduction of response time of fingerprint identification under the screen.

In order to solve the above problems, embodiments of the present invention provide a display panel and a display device, and the following describes embodiments of the display panel and the display device with reference to the drawings.

An embodiment of the present invention provides a display panel, which may be an Organic Light Emitting Diode (OLED) display panel, and may also be other types of display panels, such as a Micro Light Emitting Diode (Micro-LED) or a Quantum dot Light Emitting Diode (Quantum Light Emitting Diode, QLED) display panel.

Referring to fig. 1, fig. 1 is a schematic view of a display panel according to an embodiment of the present disclosure. The display panel 100 includes a display area AA and a fingerprint identification area NA, wherein the display area AA is an area capable of displaying a picture and is provided with pixel units; the fingerprint identification area NA is an area corresponding to the photoelectric sensor device 22, and performs fingerprint acquisition on a finger to obtain a target fingerprint image.

Referring to fig. 2, fig. 2 is a cross-sectional view along direction AA of fig. 1. The display panel 100 further includes a substrate 10 and a functional device layer 20, wherein the substrate 10 may be a glass substrate, or may also be a flexible substrate made of Polyimide (PI) or Polyethylene terephthalate (PET), so that the display panel 100 can be bent. The functional device layer 20 is disposed on one side of the substrate 10, the functional device layer 20 includes a light emitting device 21 located in the display area AA and a photo sensor device 22 located in the fingerprint identification area NA, and the photo sensor device 22 is configured to receive light of the light emitting device 21 reflected by a finger to identify fingerprint information of the finger.

Specifically, the light emitting devices 21 around the fingerprint identification area NA are lighted under the control of the driving device, after the lighting, when a finger is placed in the fingerprint identification area NA, light emitted by the lighted light emitting devices 21 is reflected back by the finger and received by the photoelectric sensor 22, the photoelectric sensor 22 can convert an optical signal into an electrical signal, the acquired fingerprint information is compared with preset fingerprint information, and if the comparison is consistent, the unlocking and other operations can be executed.

All set up at functional device layer 20 through the photoelectric sensor spare 22 with light emitting device 21 and be used for discerning the fingerprint, realize setting up photoelectric sensor spare 22 in display panel 100's inside, avoid setting up photoelectric sensor spare 22 in the one side that display panel 100 deviates from the light-emitting side, function rete and the distance that need see through by finger reflection light arrival photoelectric sensor have been reduced, the requirement to display panel 100 light transmissivity has been reduced, photoelectric sensor's response time has been reduced, and photoelectric sensor's rate of identification has been improved.

In addition, the display panel 100 of the embodiment of the application further includes a color film layer 30, the color film layer 30 is located on a side of the functional device layer 20 away from the substrate base plate 10, the color film layer 30 includes a first filter 31, and the first filter 31 may be specifically a filter, which is an optical device for selecting a desired radiation waveband. The first filter 31 and the photosensor 22 are disposed in a direction perpendicular to the substrate 10, that is, the first filter 31 and the photosensors are sequentially spaced in a direction perpendicular to the substrate 10. When the light emitted from the light emitting device 21 is reflected to the first filter 31 by the finger, the light of some bands is absorbed, so that the light reflectivity of the band is reduced, the light of the specific radiation band reflected by the finger is received by the photoelectric sensor 22, the optical crosstalk of the external light to the photoelectric sensor is inhibited, the response time of the photoelectric sensor is further reduced, and the recognition rate of fingerprint recognition is improved.

Optionally, the functional device layer 20 includes a plurality of light emitting devices 21 and a plurality of photoelectric sensing devices 22, and correspondingly, the number of the first optical filters 31 is also a plurality, and the plurality of first optical filters 31 and the plurality of photoelectric sensing devices 22 are arranged in a one-to-one correspondence manner, so as to further improve the recognition rate of the fingerprint recognition area NA.

In some embodiments, the first filter 31 is a green filter. When light emitted from the light emitting device 21 around the photo sensor device 22 is reflected by the finger to the first filter 31, other colors of light, such as red light and blue light, are absorbed by the first filter 31, reducing the reflectivity of the other colors of light, and green light can be reflected by the finger to the photo sensor device 22, so that the photo sensor device 22 can respond quickly without crosstalk of other light because the photo sensor device 22 is most sensitive to green light, further improving the accuracy and recognition efficiency of fingerprint recognition.

Preferably, referring to fig. 3, fig. 3 is a schematic cross-sectional view of a display panel according to an embodiment of the present disclosure. The light emitting device 21 includes a first sub light emitting device 211 emitting light of green color, a second sub light emitting device 212 emitting light of red color, and a third sub light emitting device 213 emitting light of blue color, the first sub light emitting device 211, the second sub light emitting device 212, and the third sub light emitting device 213 form one light emitting unit, and a plurality of light emitting units are uniformly arranged in the display area AA. The photo sensor device 22 is disposed near the first sub light emitting device 211, so that more green light can be reflected by the finger to the first filter 31 and finally reach the photo sensor device 22, thereby improving the fingerprint recognition efficiency of the photo sensor device 22. A larger number of first sub-light emitting devices 211 may be disposed around the photosensor device 22 as much as possible without affecting the arrangement of the light emitting units.

In some embodiments, the orthographic projection of the first filter 31 on the substrate base plate 10 is within the orthographic projection of the photo-sensing device 22 on the substrate base plate 10. If the area of the orthographic projection of the first filter 31 on the substrate 10 is larger than the area of the orthographic projection of the photoelectric sensor 22 on the substrate 10, the first filter 31 may receive the reflected light of the light emitting device 21 on the first filter 31 in other areas, which affects the display effect of the display area AA. Therefore, the orthographic projection of the first light-filtering member 31 on the substrate base plate 10 is positioned in the orthographic projection of the photoelectric sensing device 22 on the substrate base plate 10, so that the photoelectric sensing device 22 can only receive the reflected light of the light-emitting device 21 around the fingerprint identification area NA on the first light-filtering member 31, and the display effect of the display area AA is not affected.

Preferably, the orthographic projection of the first light-filtering part 31 on the substrate base plate 10 is overlapped with the orthographic projection of the photoelectric sensor part 22 on the substrate base plate 10, so that the display effect of the display area AA is not affected, the photoelectric sensor can receive sufficient reflected light of the light-emitting device 21 around the fingerprint identification area NA on the first light-filtering part 31, and the identification efficiency of the fingerprint identification area NA is ensured.

In some embodiments, the color film layer 30 further includes a second filter 32, the second filter 32 may be a filter, and the second filter 32 and the light emitting device 21 are correspondingly disposed in a direction perpendicular to the substrate 10, that is, the second filter 32 and the light emitting device 21 are sequentially arranged at intervals in the direction perpendicular to the substrate 10. It is understood that the first sub light emitting device 211, the second sub light emitting device 212 and the third sub light emitting device 213 may be respectively provided with the second filter 32 correspondingly, and the second filter 32 corresponds to the light emitting color of the light emitting device 21, for example, the second filter 32 corresponding to the first sub light emitting device 211 is a green filter, which absorbs red light and blue light and emits only green light; the second filter 32 corresponding to the second sub-light emitting device 212 is a red filter, and absorbs green light and blue light, and emits only red light; the second filter 32 corresponding to the third sub-light emitting device 213 is a blue filter, and absorbs red light and green light and emits only blue light. The color film layer 30 of the embodiment reduces the emergence of stray light of the display panel 100 by providing the second filter 32 corresponding to the light emitting device 21, thereby improving the display effect.

Preferably, please refer to fig. 4, wherein fig. 4 is a partial schematic view of a display panel according to an embodiment of the present disclosure. The orthographic projection of the light-emitting device 21 on the substrate base plate 10 is positioned in the orthographic projection of the second filter 32 on the substrate base plate 10, namely the orthographic projection area of the light-emitting device 21 on the substrate base plate 10 is smaller than or equal to the orthographic projection area of the second filter 32 on the substrate base plate 10, and the light-emitting rate of the light-emitting device 21 is ensured.

More preferably, the orthographic projection area of the light emitting device 21 on the substrate 10 is smaller than the orthographic projection area of the second filter 32 on the substrate 10, so that the light emitting angle of the light emitting device 21 is increased, and the display effect of the display panel 100 with a large viewing angle is ensured.

In some embodiments, please refer to fig. 5, wherein fig. 5 is another schematic cross-sectional view of a display panel provided in the embodiments of the present application. The color film layer 30 further includes a first light shielding layer 33, the first light shielding layer 33 is respectively provided with a first via hole 331 and a second via hole 332 along a direction perpendicular to the substrate 10, the first light filter 31 is embedded in the first via hole 331, and the second light filter 32 is embedded in the second via hole 332. The first light-shielding layer 33 is a black matrix and covers the functional device layer 20 on the side away from the base substrate 10, so that the reflectance of external light can be reduced, and the light-shielding layer can also serve as a collimating layer of the photoelectric sensor 22.

In some embodiments, the functional device layer 20 further includes a pixel defining layer 23, the pixel defining layer 23 is respectively opened with a first opening 231 and a second opening 232 along a direction perpendicular to the substrate base plate 10, the photosensor device 22 is located in the first opening 231, and the light emitting device 21 is located in the second opening 232. By forming the first opening 231 at the position of the pixel defining layer 23 corresponding to the first filter 31, the transmission effect of the light reflected by the finger is further improved, and the sensitivity of fingerprint identification is improved. By providing the second opening 232, interference between adjacent light emitting devices 21 can be reduced, and a light emitting effect can be ensured.

In some embodiments, the pixel defining layer 23 is multiplexed as a second light shielding layer, the pixel defining layer 23 can be configured as a black matrix to reduce the reflectivity of light inside the display panel 100, and can also be used as a first collimating layer of the photo-sensor 22, and the color film layer 30 is used as a second collimating layer of the photo-sensor 22 to reduce optical crosstalk.

In some embodiments, the display panel 100 further includes an array layer 40 disposed between the substrate base plate 10 and the functional device layer 20, wherein the array layer 40 includes a first thin film transistor 41 located in the fingerprint identification area NA and a second thin film transistor 42 located in the display area AA, the first thin film transistor 41 is used for driving the photo sensor device 22, and the second thin film transistor 42 is used for driving the light emitting device 21. Specifically, each of the photo-sensor devices 22 may be driven by a plurality of first thin film transistors 41, and each of the light-emitting devices 21 may be driven by a plurality of second thin film transistors 42. The first thin film transistor 41 includes a first active layer 411, a first gate electrode 412, and a first source-drain electrode 413, and the photosensor device 22 and the first source-drain electrode 413 are connected by a via hole, and in the present embodiment, a top gate type thin film transistor in which the first gate electrode 412 is disposed above the first active layer 411 with an insulating layer of the first gate electrode 412 interposed therebetween is illustrated in fig. 5, but according to other embodiments, the first thin film transistor 41 may also be a bottom gate type thin film transistor. The second thin film transistor 42 includes a second active layer 421, a second gate electrode 422, and a second source-drain electrode 423, and the light emitting device 21 and the second source-drain electrode 423 are connected through a via hole. Of course, the second thin film transistor 42 may be a top gate thin film transistor or a bottom gate thin film transistor. The present embodiment not only facilitates the manufacturing work but also can reduce the thickness of the display panel 100 by disposing the driving device of the photo sensor device 22 and the driving device of the light emitting device 21 at the same layer.

In some embodiments, the display panel 100 further includes an encapsulation layer 50, and the encapsulation layer 50 is located between the functional device layer 20 and the color film layer 30. The encapsulation layer 50 covers the functional device layer 20 and serves to protect the functional device layer 20 from moisture and oxygen attack. The encapsulation layer 50 may be a thin film encapsulation layer, and includes an inorganic encapsulation layer, an organic encapsulation layer, and an inorganic encapsulation layer stacked together to block moisture and oxygen.

A second aspect of the present invention provides a display device including the display panel of any one of the above embodiments. Since the display device adopts all technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and no further description is given here.

The display device may be any device having a display function, and may be a mobile device such as a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a Personal Digital Assistant (PDA), or may be a non-mobile device such as a Personal Computer (PC), a Television (TV), a teller machine, or a self-service machine.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A display panel, comprising a display area and a fingerprint identification area, the display panel further comprising:

a substrate base plate;

the functional device layer is arranged on one side of the substrate and comprises a light-emitting device positioned in the display area and a photoelectric sensor positioned in the fingerprint identification area, and the photoelectric sensor is used for receiving light rays of the light-emitting device reflected by a finger so as to identify fingerprint information of the finger;

the color film layer is positioned on one side, away from the substrate base plate, of the functional device layer and comprises a first light filtering piece, and the first light filtering piece and the photoelectric sensing device are correspondingly arranged in the direction perpendicular to the substrate base plate.

2. The display panel according to claim 1, wherein the first filter is a green filter;

preferably, the light emitting device includes a first sub light emitting device emitting a green color, a second sub light emitting device emitting a red color, and a third sub light emitting device emitting a blue color, and the photosensor device is disposed adjacent to the first sub light emitting device.

3. The display panel according to claim 1, wherein an orthogonal projection of the first filter on the substrate base is located within an orthogonal projection of the photoelectric sensor device on the substrate base;

preferably, an orthographic projection of the first filter on the substrate coincides with an orthographic projection of the photoelectric sensing device on the substrate.

4. The display panel according to claim 1, wherein the color film layer further comprises a second filter, and the second filter is disposed corresponding to the light emitting device in a direction perpendicular to the substrate;

preferably, an orthographic projection of the light emitting device on the substrate base plate is positioned in an orthographic projection of the second filter on the substrate base plate.

5. The display panel of claim 4, wherein the color film layer further comprises a first light-shielding layer, the first light-shielding layer is provided with a first via hole and a second via hole along a direction perpendicular to the substrate, the first light filter is embedded in the first via hole, and the second light filter is embedded in the second via hole.

6. The display panel according to claim 1, wherein the functional device layer further comprises a pixel defining layer, the pixel defining layer is respectively provided with a first opening and a second opening along a direction perpendicular to the substrate base plate, the photoelectric sensing device is located in the first opening, and the light emitting device is located in the second opening.

7. The display panel according to claim 6, wherein the pixel defining layer is multiplexed into a second light shielding layer.

8. The display panel according to any one of claims 1 to 7, wherein the display panel further comprises an array layer disposed between the substrate base plate and the functional device layer, the array layer comprising a first thin film transistor in the fingerprint identification region and a second thin film transistor in the display region, the first thin film transistor being configured to drive the photo sensor device, and the second thin film transistor being configured to drive the light emitting device.

9. The display panel according to any one of claims 1 to 7, wherein the display panel further comprises an encapsulation layer, and the encapsulation layer is located between the functional device layer and the color film layer.

10. A display device comprising the display module according to any one of claims 1 to 9.

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