CN111584558A

CN111584558A - Display panel and display device

Info

Publication number: CN111584558A
Application number: CN202010379171.5A
Authority: CN
Inventors: 林丹; 戴其兵; 刘敏伦
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2020-05-07
Filing date: 2020-05-07
Publication date: 2020-08-25

Abstract

The application provides a display panel and a display device, wherein the display panel comprises a substrate; the light-emitting unit is arranged on the substrate in an array and comprises a pixel driving circuit and a light-emitting device electrically connected with the pixel driving circuit; the photosensitive unit is arranged on the substrate and positioned between two adjacent light-emitting units, and comprises a photosensitive sensor (VDP); wherein the photosensor (VDP) does not overlap with a projection of a light emitting layer of the light emitting device on the substrate. This application makes the intensity consumption reduction after the reverberation pierces through display panel through increasing a sensitization unit in display panel's circuit unit to full screen fingerprint unblock has been realized.

Description

Display panel and display device

Technical Field

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

Background

Fingerprint identification technology is the most mainstream mobile phone biological identification mode at present, and the application popularity degree of the fingerprint identification technology far exceeds iris identification and face identification. No matter traditional fingerprint unblock adopts front scraping or pressing mode unblock, still adopts the back unblock, can all influence the outward appearance or the screen of smart machines such as cell-phones and account for than, therefore fingerprint is in charge of under the screen.

Wherein, the screen is lower the fingerprint unblock is sent light by the OLED screen, pierces through the apron to the finger surface, and finger pressfitting position leads to the light of reflection different because the different lines of finger, and reflection light pierces through OLED pixel gap and shines fingerprint sensor, and fingerprint sensor forms the fingerprint image according to reflection light. However, the disadvantage is that the reflected light of the fingerprint needs to penetrate the OLED module, which greatly reduces the intensity of the reflected light and increases the difficulty of identification.

Disclosure of Invention

The application provides a display panel and display device for reduce display panel thickness, increase the intensity of radiant light, promote fingerprint identification's probability simultaneously, and realize full-screen unblock.

In order to realize the functions, the technical scheme provided by the application is as follows:

a display panel, comprising:

a substrate;

the light-emitting unit is arranged on the substrate in an array and comprises a pixel driving circuit and a light-emitting device electrically connected with the pixel driving circuit;

the photosensitive unit is arranged on the substrate and positioned between two adjacent light-emitting units, and comprises a photosensitive sensor (VDP);

wherein the photosensor (VDP) does not overlap with a projection of a light emitting layer of the light emitting device on the substrate.

In the display panel of the present application, the light sensing unit and the pixel driving circuit all include a thin film transistor layer.

In the display panel, the thin film transistor layer corresponding to the light emitting unit comprises a first active layer and a source/drain electrode which are stacked;

the thin film transistor layer corresponds to the photosensitive unit and comprises a second active layer and a conducting layer which are stacked.

In the display panel of the present application, the first active layer and the second active layer are disposed at the same layer and at an interval;

the source/drain electrode and the conductive layer are stacked, and the conductive layer is located above the source/drain electrode.

In the display panel of the present application, the source/drain electrode overlaps with the projection portion of the conductive layer on the substrate, and the overlapping portion is located at the gap between the light emitting unit and the photosensitive unit.

In the display panel of this application, the components and parts of sensitization unit include: a first thin film transistor (M1), a second thin film transistor (M2), a third thin film transistor (M3), and a storage capacitor (C2);

the grid electrode of the first thin film transistor (M1) is connected with the (n-1) th-level scanning signal (SCAN (n-1)), the drain electrode is electrically connected with the first end of the second capacitor (C2), and the source electrode is connected with the positive power supply Voltage (VDD);

the grid electrode of the second thin film transistor (M2) is electrically connected with the drain electrode of the first thin film transistor (M1), the source electrode is connected to a positive power supply Voltage (VDD), and the drain electrode is connected to the negative electrode of the photosensitive sensor (VDP);

the grid electrode of the third thin film transistor (M3) is connected with the nth-level scanning signal (SCAN (n)), the drain electrode is connected with the read-write signal (RW), and the source electrode is connected with the positive electrode of the photosensitive sensor (VDP);

the second end of the storage capacitor (C2) is connected with an operating voltage signal (V1), and the first end is connected with the drain electrode of the first thin film transistor (M1) and the gate electrode of the second thin film transistor (M2).

In the display panel of the application, the components of the photosensitive unit and the components of the pixel driving circuit are arranged on the same layer, and the read-write signal Routing (RW) and the data signal routing (Vdate) are arranged on the same layer.

In the display panel of the present application, the photosensitive sensor (VDP) is a photosensitive diode or a photosensitive triode.

The application also provides a display device, which comprises any one of the display panels; and the fingerprint module is positioned below the display panel.

In the display device of this application, the fingerprint module corresponds sensitization unit in the display panel sets up.

Has the advantages that: this application is through increasing a sensitization unit in the circuit unit in display panel, embedding a sensitization unit in sub-pixel drive circuit, and sensitization sensor (VDP) among the sensitization unit do not overlap with luminescence unit in the vertical direction projection, and this kind of structure not only can not influence luminous efficiency, enables the intensity consumption reduction after the reverberation pierces through display panel simultaneously to can realize full screen fingerprint unblock.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present application;

FIG. 2 is a circuit diagram of a light sensing unit in a pixel driving circuit according to an embodiment of the present disclosure;

FIG. 3 is a diagram illustrating a layout of a plurality of light sensing units in a pixel driving circuit according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a display device according to a second embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to 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 mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Among the prior art, the screen fingerprint unblock is shielded by the OLED and is sent light, and light pierces through the apron and arrives the finger surface, and the finger pressfitting position leads to the light of reflection different because of the different lines of finger, and reflection light pierces through OLED pixel gap and shines fingerprint sensor, and fingerprint sensor can form the fingerprint image according to reflection light. However, when the reflected light of the fingerprint penetrates the OLED module in the display panel, the intensity of the reflected light is reduced, and the difficulty of fingerprint identification is increased. Based on this, the application provides a display panel and display device, can solve the defect of complaining.

Example one

Referring to fig. 1, a structure of a display panel provided in an embodiment of the present application is schematically illustrated.

In this embodiment, when the resolution of the display panel is higher, the display panel includes a substrate 10, a thin-film transistor layer 20, a light-emitting device layer 30, a pixel defining layer 40, and a thin-film encapsulation layer 50.

In the present embodiment, the display panel includes a light emitting unit 100 and a light sensing unit 200.

The light emitting unit 100 is arranged on the substrate 10 in an array, and the light emitting unit 100 includes a pixel driving circuit and a light emitting device layer 30 electrically connected to the pixel driving circuit.

The light sensing unit 200 is disposed on the substrate 10, and the light sensing unit 200 is located between two adjacent light emitting units 100.

In this embodiment, the light sensing unit 200 is located between two adjacent light emitting units 100, so as to better receive the reflected light of the fingerprint.

In the present embodiment, the substrate 10 is a flexible transparent PI substrate, mainly made of polyimide, and the PI material can effectively improve the light transmittance.

In this embodiment, the thin-film transistor layer 20 is disposed on the upper surface of the substrate 10, and the thin-film transistor layer 20 sequentially includes, from bottom to top, a first buffer layer 201, a substrate 202, a second buffer layer 203, a first gate insulating layer 204, a second gate insulating layer 205, a dielectric layer 206, a passivation layer 207, a first planarization layer 208, and a second planarization layer 209.

The thin-film transistor layer 20 further includes a first active layer, a second active layer, a first gate electrode, a second gate electrode, a third gate electrode, a fourth gate electrode, a source/drain electrode, and a conductive layer.

The first active layer and the second active layer are disposed on the upper surface of the second buffer layer 203 far from the substrate 202, and are disposed at the same layer and at an interval.

The first gate and the second gate are disposed on the upper surface of the first gate insulating layer 204 away from the second buffer layer 203, and are disposed at the same layer and at intervals.

The third gate and the fourth gate are disposed on the upper surface of the second gate insulating layer 205 away from the first gate insulating layer 204, and are disposed at the same layer and at intervals.

The source/drain is disposed on the upper surface of the dielectric layer 206 away from the second gate insulating layer 205.

The conductive layer is disposed on the upper surface of the first planar layer 208 away from the second planar layer 209.

In this embodiment, the first active layer, the first gate electrode and the third gate electrode are in one-to-one correspondence on the substrate 10.

The second active layer, the second gate electrode, and the fourth gate electrode are in one-to-one correspondence on the substrate base plate 10.

In this embodiment, the light emitting unit 100 includes the first active layer, the first gate electrode, the third gate electrode, and the source/drain electrodes, which are stacked.

The photosensitive unit 200 includes the second active layer, the second gate, the fourth gate, and a conductive layer, which are stacked.

The source/drain electrodes are overlapped with the projection of the conductive layer on the substrate 10, and the overlapped portion is located at the gap between the light emitting unit 100 and the light sensing unit 200, so that the aperture ratio of the display panel is not affected.

The source/drain electrodes are data signal traces (Vdate), and the conductive layer is read-write signal traces (RW).

In this embodiment, the materials used for the first buffer layer 201, the second buffer layer 203, the first gate insulating layer 204, the second gate insulating layer 205, and the dielectric layer 206 are inorganic materials, including one of silicon nitride, silicon oxide, or silicon oxynitride, which is not limited in this embodiment.

In this embodiment, the light emitting device layer 30 is disposed on the upper surface of the thin-film transistor layer 20 away from the substrate 10.

The light-emitting device layer 30 includes an anode 301, a light-emitting layer 302, and a cathode 303, which are stacked.

The anode 301 is disposed on the upper surface of the second planar layer 209 away from the first planar layer 208, and the anode 301 is connected to the source/drain through the via.

The light emitting layer 302 includes sub-pixels on the substrate 10 corresponding to the pixel driving circuits one to one.

The sub-pixel includes one of a red sub-pixel (R), a green sub-pixel (G), and a blue sub-pixel (B).

In this embodiment, the pixel defining layer 40 is disposed on the upper surface of the second planarization layer 209 away from the first planarization layer 208.

In the present embodiment, the photosensitive unit 200 includes a photosensitive sensor (VDP) which does not overlap with a projection of the light emitting layer 302 in the light emitting device 100 on the substrate 10.

In this embodiment, the photosensitive sensor (VDP) includes one of a photosensitive diode or a photosensitive triode.

Further, in this embodiment, the photosensitive sensor (VDP) is a photosensitive diode.

In this embodiment, the photosensor (VDP) and the red (R), green (G) and blue (B) sub-pixels are alternately disposed on the substrate 10.

In the embodiment, a photosensitive unit 200 is added in a circuit unit of the display panel, the photosensitive unit 200 includes a photosensitive sensor (VDP) located in the pixel driving circuit, and the photosensitive sensor (VDP) and the projection of the light emitting unit on the substrate do not overlap, so that the luminous efficiency of the display panel is not affected, and the intensity consumption of the reflected light after penetrating through the display panel is reduced.

Referring to fig. 2, a circuit diagram of a light sensing unit in a pixel driving circuit according to an embodiment of the present application is provided.

Generally, there are common pixel driving circuits such as 6T1C, 6T2C, 7T1C and 7T2C, and the present application only describes the 6T1C driving circuit as an example.

It should be noted that the kind of the pixel driving circuit is not limited in the present application.

In the present embodiment, the components of the light sensing unit 200 include a first thin film transistor (M1), a second thin film transistor (M2), a third thin film transistor (M3), a storage capacitor (C2), and a light sensing sensor (VDP).

The gate of the first thin film transistor (M1) is connected to the (n-1) th-level SCAN signal (SCAN (n-1)), the drain is electrically connected to the first end of the second capacitor (C2), and the source is connected to the positive power supply Voltage (VDD).

The grid electrode of the second thin film transistor (M2) is electrically connected with the drain electrode of the first thin film transistor (M1), the source electrode is connected to a positive power supply Voltage (VDD), and the drain electrode is connected to the negative electrode of the photosensitive sensor (VDP).

The gate of the third thin film transistor (M3) is connected to the nth scan signal (scan (n)), the drain is connected to the read/write signal (RW), and the source is connected to the positive electrode of the photosensitive sensor (VDP).

Referring to fig. 3, a wiring method of the light sensing unit in the pixel driving circuit according to an embodiment of the present disclosure is provided.

In the present embodiment, the light emitting unit 100 includes a pixel driving circuit, and components of the pixel driving circuit include a driving transistor T1, a first thin film transistor (T2), a second thin film transistor (T3), a third thin film transistor (T4), a fourth thin film transistor (T5), and a fifth thin film transistor (T2).

The components of the light sensing unit 200 include a first thin film transistor (M1), a second thin film transistor (M2), a third thin film transistor (M3), a storage capacitor (C2), and a light sensing sensor (VDP).

Referring to fig. 1 and fig. 3, in the present embodiment, components in the pixel driving circuit are formed by stacking the source/drain and the first active layer on the substrate 10, wherein the source/drain is a data signal trace (Vdate).

The components of the photosensitive unit 200 are formed by stacking the conductive layer and the second active layer on the substrate 10, wherein the conductive layer is a write signal trace (RW).

When the resolution of the display panel is not high, the components of the photosensitive unit 200 and the components of the pixel driving circuit are disposed in the same layer, and the read-write signal trace (RW) and the data signal trace (Vdate) are disposed in the same layer.

Example two

Referring to fig. 4, a schematic structural diagram of a display device according to a second embodiment of the present application is shown.

The present embodiment provides a display device, wherein the display panel includes the display panel of the first embodiment; and a fingerprint module.

The display panel has already been described in detail in the first embodiment, and the description is not repeated here.

In this embodiment, the fingerprint module 300 is located below the display panel.

The fingerprint module 200 corresponds to the light sensing unit 200 in the display panel.

In this embodiment, light is emitted from the light emitting layer 302, and the light penetrates through the film packaging layer 50 to the surface of the finger, because the surface of the finger has different lines, so the light reflected back to the display panel is also different, and when the reflected light irradiates to two adjacent light emitting units 100, the gap between the light emitting units is formed between the light sensing devices (VDP), the light sensing devices (VDP) can form a fingerprint image according to the reflected light, so that the reflected light is prevented from penetrating through the display panel, the loss of the light is reduced, the recognition accuracy is improved, and the full-screen fingerprint unlocking is realized.

The application provides a display panel and a display device, wherein the display panel comprises a substrate; the light-emitting unit is arranged on the substrate in an array and comprises a pixel driving circuit and a light-emitting device electrically connected with the pixel driving circuit; the photosensitive unit is arranged on the substrate and positioned between two adjacent light-emitting units, and comprises a photosensitive sensor (VDP); wherein the photosensor (VDP) does not overlap with a projection of a light emitting layer of the light emitting device on the substrate.

This application is through increasing a sensitization unit in display panel's circuit unit, including one in the sensitization unit be located sensitization sensor (VDP) among the pixel drive circuit, sensitization sensor (VDP) with the projection of luminescence unit on the substrate base plate does not overlap to the realization does not influence display panel's luminous efficacy, reduces the intensity consumption behind the reverberation pierces through display panel simultaneously, and has realized full screen fingerprint unblock.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The display panel and the display device provided by the embodiments of the present application are described in detail above, and the principle and the implementation of the present application are explained in the present application by applying specific examples, and the description of the embodiments above is only used to help understanding the technical solution and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. A display panel, comprising:

a substrate;

2. The display panel of claim 1, wherein the light sensing unit and the pixel driving circuit each comprise a thin film transistor layer.

3. The display panel according to claim 2, wherein the thin film transistor layer includes a first active layer and a source/drain electrode which are stacked;

4. The display panel according to claim 3, wherein the first active layer and the second active layer are disposed at a same layer and a distance;

5. The display panel according to claim 4, wherein the source/drain electrodes coincide with a projected portion of the conductive layer on the substrate, and the coincident portion is located at a gap between the light emitting unit and the light sensing unit.

6. The display panel according to claim 1, wherein the components of the light sensing unit include: a first thin film transistor (M1), a second thin film transistor (M2), a third thin film transistor (M3), and a storage capacitor (C2);

7. The display panel according to claim 1, wherein the components of the photo sensing unit and the components of the pixel driving circuit are disposed at the same layer, and the read-write signal trace (RW) and the data signal trace (Vdate) are disposed at the same layer.

8. A display panel as claimed in claim 1 characterized in that the photosensor (VDP) is a photodiode or a photodiode.

9. A display device, comprising the display panel according to any one of claims 1 to 8 and a fingerprint module; the fingerprint module is located display panel below.

10. The display device as claimed in claim 9, wherein the fingerprint module is disposed corresponding to a photosensitive unit in the display panel.