CN114253423A - Display panel, control method thereof and electronic equipment - Google Patents

Display panel, control method thereof and electronic equipment Download PDF

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Publication number
CN114253423A
CN114253423A CN202111637010.2A CN202111637010A CN114253423A CN 114253423 A CN114253423 A CN 114253423A CN 202111637010 A CN202111637010 A CN 202111637010A CN 114253423 A CN114253423 A CN 114253423A
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China
Prior art keywords
light
emitting element
transistor
display panel
photosensitive element
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Granted
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CN202111637010.2A
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Chinese (zh)
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CN114253423B (en
Inventor
连璐
郭万龙
卢峰
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Shanghai Tianma Microelectronics Co Ltd
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Shanghai Tianma Microelectronics Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/147—Digital output to display device ; Cooperation and interconnection of the display device with other functional units using display panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Computer Hardware Design (AREA)
  • Image Input (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

The application discloses a display panel, a control method thereof and electronic equipment, wherein the display panel is provided with a photosensitive element connected with a pixel circuit, image display and fingerprint detection can be carried out in a time-sharing manner, in an image display period, on the basis of a first time sequence signal, the photosensitive element is controlled to be in open circuit with a first node, and a driving transistor, a first reset transistor and a compensation transistor are controlled to control a light-emitting element to carry out light-emitting display; and in the fingerprint detection period, switching the conduction state of the photosensitive element and the pixel circuit based on the second time sequence signal, controlling the driving transistor, the first reset transistor and the compensation transistor, collecting a fingerprint signal related to the photosensitive element detection signal, and outputting the fingerprint signal through the first reset transistor. The photosensitive element is integrated in the display panel, and the multiplexing pixel circuit is used as a fingerprint detection circuit, so that the thickness of the panel is reduced, and the fingerprint detection precision and accuracy are improved.

Description

Display panel, control method thereof and electronic equipment
Technical Field
The present application relates to the field of electronic devices, and more particularly, to a display panel, a control method thereof, and an electronic device.
Background
With the development of science and technology, more and more electronic devices with display functions are widely applied to daily life and work of people, bring great convenience to the daily life and work of people, and become an indispensable important tool for people at present. The main component of the electronic device that implements the display function is the display panel.
In order to meet the increasing functional requirements of people, electronic equipment has a fingerprint detection function. In the prior art, an optical fingerprint chip is directly attached and fixed to the back of a display panel to collect fingerprint information.
Among the prior art, the design of fingerprint chip under the screen of the fixed optics fingerprint chip of display panel back laminating not only can increase panel thickness, and fingerprint detection precision and accuracy are relatively poor moreover.
Disclosure of Invention
In view of the above, the present application provides a display panel, a control method thereof and an electronic device, and the scheme is as follows:
a display panel has a display area having a light emitting element and a pixel circuit connected to the light emitting element;
the pixel circuit includes: a driving transistor for supplying a driving current to the light emitting element to make the light emitting element emit light; the grid electrode of the driving transistor is connected with the first node; a first reset transistor for resetting a voltage of the first node; the compensation transistor is connected between the first node and the first pole of the driving transistor and is used for performing threshold voltage compensation on the driving transistor;
the photosensitive element is connected with the first node;
wherein the display panel has an image display period and a fingerprint detection period;
in the image display period, the photosensitive element is disconnected with the first node, and the driving transistor, the first reset transistor and the compensation transistor are used for controlling the light-emitting element to perform light-emitting display based on a preset first timing signal;
in the fingerprint detection period, the photosensitive element is used for switching the conduction state of the pixel circuit based on a preset second time sequence signal, and the driving transistor, the first reset transistor and the compensation transistor are used for collecting the fingerprint signal related to the photosensitive element detection signal based on the second time sequence signal and outputting the fingerprint signal through the first reset transistor.
The application also provides an electronic device comprising the display panel.
The application also provides a control method of the display panel, which comprises the following steps:
controlling a display panel to perform fingerprint detection and image display in a time-sharing manner;
wherein the content of the first and second substances,
in the image display period, on the basis of a preset first timing signal, controlling the photosensitive element to be disconnected with the first node, and controlling the driving transistor, the first reset transistor and the compensation transistor to control the light-emitting element to perform light-emitting display;
in the fingerprint detection period, the conduction state of the photosensitive element and the pixel circuit is switched based on a preset second time sequence signal, the driving transistor, the first reset transistor and the compensation transistor are controlled, the fingerprint signal related to the photosensitive element detection signal is collected, and the fingerprint signal is output through the first reset transistor.
In the display panel and the control method thereof and the electronic device provided by the technical scheme, the photosensitive element connected with the pixel circuit is arranged, image display and fingerprint detection can be performed in a time-sharing mode, the photosensitive element is directly integrated inside the display panel compared with the design of a conventional fingerprint chip under a screen, the pixel circuit is used as a fingerprint detection circuit, the panel thickness is greatly reduced compared with the design of the conventional fingerprint chip under the screen, and the fingerprint detection precision and accuracy are improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in related arts, the drawings used in the description of the embodiments or prior arts will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
The structures, proportions, and dimensions shown in the drawings and described in the specification are for illustrative purposes only and are not intended to limit the scope of the present disclosure, which is defined by the claims, but rather by the claims, it is understood that these drawings and their equivalents are merely illustrative and not intended to limit the scope of the present disclosure.
FIG. 1 is a schematic diagram of a display panel with an under-screen fingerprint chip;
fig. 2 is a schematic diagram of a circuit structure in a display panel according to an embodiment of the present disclosure;
fig. 3 is a top view of a display panel according to an embodiment of the present disclosure;
fig. 4 is a cross-sectional view of a display panel according to an embodiment of the present disclosure;
fig. 5 is a cross-sectional view of another display panel provided in the embodiment of the present application;
fig. 6 is a cross-sectional view of another display panel provided in the embodiment of the present application;
FIG. 7 is a schematic diagram illustrating a layout of light-emitting elements and light-sensing elements in a finger print collection area of a display panel according to an embodiment of the present disclosure;
FIG. 8 is a schematic diagram illustrating a layout of light-emitting elements and light-sensing elements in a fingerprint collection area of a display panel according to an embodiment of the present disclosure;
FIG. 9 is a schematic diagram illustrating a layout of light-emitting elements and light-sensing elements in a finger print collecting area of another display panel according to an embodiment of the present disclosure;
FIG. 10 is a schematic diagram illustrating a layout of light-emitting elements and light-sensing elements in a finger print collecting area of another display panel according to an embodiment of the present disclosure;
FIG. 11 is a schematic diagram illustrating a layout of light-emitting elements and light-sensing elements in a fingerprint collection area of another display panel according to an embodiment of the present disclosure;
FIG. 12 is a schematic diagram illustrating a layout of light-emitting elements and light-sensing elements in a finger print collecting area of another display panel according to an embodiment of the present disclosure;
FIG. 13 is a schematic diagram illustrating a layout of light-emitting elements and light-sensing elements in a finger print collecting area of another display panel according to an embodiment of the present disclosure;
fig. 14 is a schematic structural diagram of an electronic device according to an embodiment of the present application;
FIG. 15 is a timing diagram of a second timing signal according to an embodiment of the present application;
fig. 16 is a timing diagram of another second timing signal according to an embodiment of the present disclosure.
Detailed Description
Embodiments of the present application will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the application are shown, and in which it is to be understood that the embodiments described are merely illustrative of some, but not all, of the embodiments of the application. 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.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a display panel with an underscreen fingerprint chip, an optical fingerprint chip 13 is attached and fixed to the back surface of a display panel 11 through an optical adhesive 12, when a finger 10 touches a display area of the display panel 11 corresponding to the optical fingerprint chip 13, light emitted by the display panel is reflected by the finger 10 and then enters the optical fingerprint chip 13, and the optical fingerprint chip 13 acquires fingerprint information based on the light 13 reflected by the finger 10.
In the display panel shown in fig. 1, the optical adhesive 12 and the optical fingerprint chip 13 need to be added on the back of the display panel 11, the optical fingerprint chip 13 and the light emitting elements in the display panel 11 are different modules, the thickness of the panel can be greatly increased, when the finger 10 touches the display panel 11 to perform fingerprint identification, the optical fingerprint chip 13 and the finger 10 have a layer of optical adhesive 12 at the interval of the thickness of the whole display panel 11, and therefore the accuracy and precision of fingerprint detection are poor. In the optical fingerprint chip 13, because the TFT characteristics of different fingerprint sensor units inevitably differ in the manufacturing process, the fixed pattern noise of the fingerprint sensor unit reading the fingerprint signal is large, and the accuracy of fingerprint detection is further affected. And the fingerprint sensor unit signal output value corresponding to the fingerprint valley ridge difference is limited, further influencing the fingerprint detection precision.
In order to solve the above problems, embodiments of the present application provide a display panel, a control method thereof, and an electronic device, where the display panel is provided with a photosensitive element connected to a pixel circuit, and can perform image display and fingerprint detection in a time-sharing manner, and compared with an existing design of an underscreen fingerprint chip, the photosensitive element is directly integrated inside the display panel, and the pixel circuit is multiplexed as a fingerprint detection circuit, so that compared with a conventional design of an underscreen fingerprint chip, the thickness of the panel is greatly reduced, and the accuracy and precision of fingerprint detection are improved.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
Referring to fig. 2, fig. 2 is a schematic diagram of a circuit structure in a display panel according to an embodiment of the present disclosure, the display panel has a display area, and the display area has a light emitting device 21 and a pixel circuit 22 connected to the light emitting device 21.
The pixel circuit 22 includes: a driving transistor M3, the driving transistor M3 being used for supplying a driving current Ids to the light emitting element 21 so that the light emitting element 21 emits light; the gate of the driving transistor M3 is connected to the first node N1; a first reset transistor M5, the first reset transistor M5 is used for resetting the voltage of the first node N1; a compensation transistor M4, the compensation transistor M4 is connected between the first node N1 and the first pole of the driving transistor M3, for performing threshold voltage compensation on the driving transistor M3; wherein, the first pole of the driving transistor M3 is used for outputting the driving current Ids;
a photosensitive element 23, the photosensitive element 23 being connected to the first node N1;
wherein the display panel has an image display period and a fingerprint detection period;
in the image display period, the photosensitive element 23 is disconnected from the first node N1, and the driving transistor M3, the first reset transistor M5 and the compensation transistor M4 are used for controlling the light-emitting element 21 to perform light-emitting display based on a preset first timing signal;
in the fingerprint detection period, the photosensitive element 23 is used for switching the conducting state of the pixel circuit 22 based on a preset second timing signal, and the driving transistor M3, the first reset transistor M5 and the compensation transistor M4 are used for collecting a fingerprint signal related to the detection signal of the photosensitive element 23 based on the second timing signal and outputting the fingerprint signal through the first reset transistor M5.
Display panel is provided with photosensitive element 23 who is connected with pixel circuit 22, can carry out image display and fingerprint detection by timesharing, for fingerprint chip design under the current screen, directly with photosensitive element 23 integrated inside display panel to multiplexing pixel circuit 22 is as fingerprint detection circuit, for fingerprint chip design under the conventional screen, greatly reduced panel thickness, improved fingerprint detection precision and accuracy moreover. The photosensitive element 23 is connected with the first node N1, and the potential of the first node N1 can be lowered based on the detection signal generated by illumination, so that the driving transistor M3 works in a saturation region, the luminance of the light-emitting element 21 connected with the same pixel circuit 22 is improved, the intensity of the output fingerprint signal is improved, and the accuracy and precision of fingerprint detection are improved.
In the present invention, one of the first pole and the second pole of the transistor is a source, and the other is a drain. For a setting transistor, the first electrode may be set as a source, and the second electrode may be set as a drain, or the first electrode may be set as a drain, and the second electrode may be set as a source, which is not specifically limited in the embodiment of the present application.
As shown in fig. 2, the photosensitive element 23 is connected to a first node N1 through a first control transistor M8; a preset voltage Vcom is input to the anode of the photosensitive element 23; the gate of the first control transistor M8 is inputted with the first control signal SW, the first pole of the first control transistor M8 is connected to the negative pole of the photosensitive element 23, and the second pole of the first control transistor M8 is connected to the first node N1. In the image display period, the first control transistor M8 is controlled to be turned off by the first control signal SW, the normal display drive of the photosensitive element 23 is not affected, and in the fingerprint detection period, the first control transistor M8 is controlled to be turned on and off according to the time sequence by the first control signal SW so as to collect fingerprint information, so that the on-state control of the photosensitive element 23 and the pixel circuit 22 in the image display stage and the fingerprint detection stage can be simply realized by the first control transistor M8, the circuit structure is simple, and the control method is simple.
In the image display stage, the first control transistor M8 is controlled to be disconnected from the first node N1, so as to prevent the first control transistor M8 from affecting the pixel circuit 22, thereby ensuring normal image display in the image display stage. In the fingerprint detection stage, the conduction state of the photosensitive element 23 and the pixel circuit 22 can be controlled based on the timing signal, and the multiplexing pixel circuit 22 detects and outputs the fingerprint signal.
The gate of the first reset transistor M5 is used for inputting the second control signal S1, the first pole of the first reset transistor M5 is used for inputting the reset signal Vref and outputting the fingerprint signal in a time-sharing manner, and the second pole of the first reset transistor M5 is connected to the first node N1; the gate of the compensation transistor M4 is used for inputting the third control signal S2, the first pole of the compensation transistor M4 is connected to the first node N1, and the second pole of the compensation transistor M4 is connected to the first pole of the driving transistor M3.
In the embodiment of the present application, the display panel can multiplex the first reset transistor M5 in the pixel circuit 22 to perform the voltage reset of the first node N1 and the fingerprint detection stage in the image stage at different times, without separately adding a fingerprint identification circuit, and has good compatibility with the existing pixel circuit and simple circuit structure.
In the embodiment of the present application, the display panel is an OLED display panel, and the light emitting element 21 is an OLED element. The pixel circuits 22 and the light emitting elements 21 are in one-to-one correspondence, that is, each light emitting element 21 is individually connected to one pixel circuit 22 to perform light emitting display control.
The pixel circuit 22 is a 7T1C pixel circuit, and has 7 transistors M1-M7 and 1 storage capacitor Cst, and specifically, the pixel circuit 22 further includes:
a second control transistor M6, the second control transistor M6 is used for responding to the light emitting signal EMT to control the conducting state of the driving transistor M3 and the light emitting element 21, specifically, the gate of the second control transistor M6 is used for inputting the light emitting signal EMT, and the first pole of the second control transistor M6 is connected to the anode of the light emitting element 21;
a second reset transistor M7, the second reset transistor M7 is used for responding to the control of the third control signal S2 and resetting the voltage of the anode of the light emitting element 21, specifically, the gate of the second reset transistor M7 is used for inputting the third control signal S2, the first pole of the second reset transistor M7 is connected with the anode of the light emitting element 21, and the second pole of the second reset transistor M7 is used for inputting the reset signal Vref;
a third control transistor M1, wherein the third control transistor M1 is configured to control a conduction state between the first constant power voltage PVDD and the second pole of the driving transistor M3 based on the light emitting signal EMT, specifically, the gate of the third control transistor M1 is inputted with the light emitting signal EMT, the first pole of the third control transistor M1 is connected to the second pole of the driving transistor M3, the second pole of the third control transistor M1 is inputted with the first constant power voltage PVDD, and the second pole of the third control transistor M1 is connected to the first node N1 through the storage capacitor Cst;
the data writing transistor M2 and the data writing transistor M2 are used for writing the data signal Vdata into the second pole of the driving transistor M3 based on the input third control signal S2.
The cathode of the light emitting element 21 receives a second constant power supply voltage PVEE, which is at a low level, and the first constant power supply voltage PVDD is at a high level.
It should be noted that, in the embodiment of the present application, only the 7T1C pixel circuit is taken as an example for description, and it is obvious that the pixel circuit 22 is not limited to the 7T1C pixel circuit, and may also be other pixel circuit structures, such as a 6T1C pixel circuit or an 8T1C pixel circuit.
Referring to fig. 3, fig. 3 is a top view of a display panel provided in an embodiment of the present application, the display panel includes a display area AA, and as shown in fig. 2 and fig. 3, the display area AA has a first sub-display area AA1 and a second sub-display area AA2 that do not overlap in a direction perpendicular to the display panel, the first sub-display area AA1 is a fingerprint collection area, and the pixel circuits 22 connected to the light emitting elements 21 in the first sub-display area AA1 are all connected to the photosensitive elements 23. In the manner shown in fig. 3, a part of the display area AA is used as a fingerprint collecting area, and the pixel circuits 22 in the fingerprint collecting area are connected to the photosensitive element 23 to collect and output fingerprint signals.
In the manner shown in fig. 3, the location, shape, and size of first display area AA1 may be set based on requirements. Optionally, the first display area AA1 is located in the middle area of the lower end of the display panel, so as to facilitate fingerprint information collection with one hand.
In other modes, the display areas AA may be fingerprint collecting areas, and the pixel circuits 22 connected to the light emitting elements 21 are connected to the photosensitive elements 23. In the method, full-screen fingerprint information acquisition can be realized.
In an embodiment of the present application, a display panel includes: a light emitting element that emits red light, a light emitting element that emits green light, and a light emitting element that emits blue light; among them, the luminance decay speed of the light emitting element emitting blue light is the largest. The light sensing element 23 is used for sensing light emitted by the first light emitting element, the first light emitting element emits red light or green light, and the first light emitting element and the light sensing element 23 are connected to the same pixel circuit 22.
In other embodiments, the light sensing element 23 may be further configured to sense light emitted by a second light emitting element, which emits red or green light, and the second light emitting element is connected to a different pixel circuit 22 than the light sensing element 23.
In the embodiment of the present application, the display panel is a touch display panel, and has a touch detection electrode, which is capable of sensing a touch position of a finger in the display area AA. The display panel can control the light-emitting element 21 in the area touched by the finger to emit light with the maximum brightness at least after sensing that the finger of the user touches the fingerprint acquisition area, so that the brightness of the reflected light of the finger is improved, and the accuracy of fingerprint detection is improved.
Because the light emitting element 21 emits high light when collecting fingerprint information, the light emitting element 21 emitting blue light has the highest brightness attenuation speed, so as to avoid the uneven light emitting life and brightness of the light emitting element 21, the fingerprint detection time interval is set, and the light emitting element 21 emitting red light or green light emits high light, so that the photosensitive element 23 senses red light or green light to output fingerprint signals.
The display panel is an OLED display panel, and in view of the fact that the OLED brightness attenuation of the red light, the green light and the blue light is different, specifically, the blue light OLED brightness attenuation speed is fastest, the red light OLED brightness attenuation speed is slowest, and the green light OLED brightness attenuation speed is centered. In the embodiment of the application, set up the fingerprint detection and detect the interval, control red light or green glow OLED and carry out the highlight and give off light to photosensitive element 23 response ruddiness or green glow, with output fingerprint signal, can avoid OLED luminous life-span inhomogeneous and luminance inhomogeneous.
Referring to fig. 4, fig. 4 is a cross-sectional view of a display panel provided in an embodiment of the present application, and referring to fig. 2 and fig. 4, the display panel includes an array substrate 31, and the array substrate 31 includes a pixel circuit 22. In the direction perpendicular to the array substrate 31, the light sensing element 23 and the light emitting element 21 are not overlapped, so that the light emitting element 21 is prevented from shielding the light sensing element 23, and the accuracy and precision of fingerprint detection are ensured.
As shown in fig. 4, the display panel includes a cover plate 32 disposed on the display side, and the light emitting elements 21 and the light sensing elements 23 are located between the cover plate 32 and the array substrate 31. The finger 33 can reflect the light emitted from the light emitting element 21, and the light sensing element 23 can sense the light reflected from the finger 33 to generate a detection signal, so as to output a fingerprint signal based on the detection signal through the pixel circuit 22.
The fingerprint of the finger 33 has valleys 331 and ridges 332, and there is an air gap between the valleys 331 and the surface of the display panel, and total reflection occurs, so that the reflection signal corresponding to the valleys 331 is stronger than the reflection signal corresponding to the ridges 332 of the fingerprint. The light emitted by the light-emitting element 21 irradiates on the fingerprint valley 331, the light is strongly reflected, the light received by the photosensitive element 23 is stronger, and the generated current is larger, so that the value of Δ V of the potential of the first node N1, which is lowered, is larger, the output current Ids of the driving transistor M3 is larger, the light-emitting brightness of the light-emitting element 21 is increased, and the light intensity is further increased; the light emitted by the light emitting element 21 irradiates on the fingerprint ridge 332, the light reflection is weak, the light received by the photosensitive element 23 is weak, the generated current is small, the Δ V value of the potential of the first node N1 pulled down is small, the output current Ids of the driving transistor M3 is small, the light emitting brightness of the light emitting element 21 is low, the light intensity is not as high as that of the fingerprint valley region, but is still stronger than that of the case without the feedback of the photosensitive element 23. Therefore, the difference in response signals between the fingerprint valley 332 and the fingerprint ridge 331 is further increased by the automatic adjustment of the light emission intensity of the light emitting element 21, the contrast of the fingerprint valley ridge is increased, and the accuracy and sensitivity of fingerprint detection are improved.
Referring to fig. 5, fig. 5 is a cross-sectional view of another display panel provided in the present embodiment, and referring to fig. 2 and fig. 5, the display panel has an array substrate 31, and the array substrate 31 includes a pixel circuit 22.
The array substrate 31 has a pixel defining layer 34 thereon, and the pixel defining layer 34 has a plurality of pixel openings; the light-emitting function layer 211 of the light-emitting element 21 is located within the pixel opening; the photosensitive element 23 is located on the side of the array substrate 31 having the pixel defining layer 24, and in the direction perpendicular to the array substrate 31, the photosensitive element 23 does not overlap with the pixel opening, for example, the light emitting element 21 and the photosensitive element 23 are not shielded from each other, so that the light emitting display of the light emitting element 21 and the fingerprint information collection of the photosensitive element 23 are ensured.
As shown in fig. 5, the photosensitive element 23 includes:
a negative electrode 231 disposed on the array substrate 31;
a photosensitive functional layer 232 arranged on the side of the cathode 231 facing away from the array substrate 31;
and the positive electrode 233 is arranged on the side of the photosensitive functional layer 232, which faces away from the array substrate 31.
The light sensing element is a PIN photodiode capable of generating an electrical signal based on an incident optical signal.
In the embodiment shown in fig. 5, the photosensitive element 23 and the light emitting element 21 are provided in the same layer. Specifically, the negative electrode 231 is provided in the same layer as the anode 212 of the light-emitting element 21; the positive electrode 233 is provided in the same layer as the cathode 213 of the light-emitting element 21; the cathode 213 of the light emitting element 21 has an opening, the anode 233 is located in the opening, and the anode 233 and the orthographic projection of the cathode 213 of the light emitting element 21 on the array substrate 31 do not overlap. The transmittance of the positive electrode 233 is greater than 40%.
In the conventional OLED display panel, all the OLED light-emitting elements have a common cathode in a whole layer, and the common cathode is a whole transparent electrode, in the present application, the photosensitive element 23 is disposed in a gap region between adjacent light-emitting elements 21, and the cathode 213 of the light-emitting element 21 has an opening, so as to dispose the anode 233 of the photosensitive element 23 in the opening.
In the embodiment shown in fig. 5, the conductive layer of the cathode 213 of the light emitting device 21 can be reused to prepare the anode 233 of the photosensitive device 23, and the conductive layer of the anode 212 of the light emitting device 21 can be reused to prepare the cathode 231 of the photosensitive device, so that it is not necessary to prepare two electrodes of the photosensitive device 23 by using separate conductive layers, the two electrodes of the photosensitive device 23 do not increase the panel thickness, and the manufacturing process of the two electrodes of the light emitting device 21 can be compatible, and the manufacturing cost is not increased. The photosensitive functional layer 232 of the photosensitive element 23 is disposed in the pixel defining layer 34, a photosensitive window is formed in the pixel defining layer 34 while forming a pixel opening, and is used for disposing the photosensitive functional layer 232, the photosensitive window and the pixel window can be formed by the same etching process without adding an additional etching process, and the photosensitive functional layer 232 is disposed in the pixel defining layer 34 without increasing the panel thickness.
Referring to fig. 6, fig. 6 is a cross-sectional view of another display panel provided in the present embodiment, and referring to fig. 2 and fig. 6, the display panel has an array substrate 31, and the array substrate 31 includes a pixel circuit 22.
In this embodiment, the light receiving element 23 and the light emitting element 21 are provided in different layers. Specifically, the photosensitive element 23 is located between the light emitting element 21 and the array substrate 31 in a direction perpendicular to the display panel. The array substrate 31 has a first insulating layer 41, the first insulating layer 41 is located on one side of the pixel circuit 22 facing the light emitting element 21; the negative electrode 231 of the photosensitive element 23 is arranged on the side of the first insulating layer 41 facing away from the array substrate 31; a second insulating layer 42 is arranged on the side of the negative electrode 231, which is far away from the array substrate 31; the second insulating layer 42 has an induction window exposing the cathode 231, and the photosensitive functional layer 232 is located in the induction window; the anode 212 of the light emitting element 21 is disposed on the second insulating layer 42 on the side away from the array substrate 31; the positive electrode 233 is provided in the same layer as the anode 212 of the light-emitting element 21.
In the embodiment shown in fig. 6, the array substrate 31 has a wiring layer including a signal line connected to the pixel circuit 22 and a cathode 231. The negative electrode 231 is manufactured by multiplexing the wiring layer of the array substrate 31, and the negative electrode 231 is manufactured without independently increasing a metal layer, so that the thickness of the panel is reduced.
The anode 233 and the anode 212 are arranged in the same layer, and the anode 233 does not need to be manufactured in a separate thickness space, so that the thickness of the panel is reduced. The anode 212 includes a plurality of stacked conductive layers, at least one of which is light-transmitting, and the positive electrode 233 can be prepared by multiplexing the light-transmitting conductive layers in the positive electrode 233.
In other ways, when the photosensitive element 23 and the light emitting element 21 are disposed in different layers, the photosensitive element 23 may also be disposed on the side of the pixel defining layer 34 away from the array substrate 31.
At least part of the display area of the display panel is a fingerprint acquisition area, the pixel circuits 22 connected with the light-emitting elements 21 in the fingerprint acquisition area are all connected with photosensitive elements 23, and the lengths of the connecting wires between different photosensitive elements 23 and the corresponding pixel circuits can be the same. The photosensitive element 23 is located between two adjacent light emitting elements 21 in a direction parallel to the array substrate 31, and the distance between the photosensitive element 23 and the nearest adjacent light emitting element is greater than 0.6 μm and less than half of the distance between the two adjacent light emitting elements 21.
In the embodiment of the present application, as for the photosensitive element 23 and the light emitting element 21 connected to the same pixel circuit 22, the photosensitive element 23 is located on one side of the light emitting element 21 in a direction perpendicular to the display panel. At this time, the layout of the light emitting elements 21 and the light sensing elements 23 in the fingerprint collection area in the display panel may be as shown in fig. 7 to 11.
Referring to fig. 7, fig. 7 is a schematic diagram illustrating a layout manner of light emitting elements and light sensing elements in a fingerprint collection area of a display panel according to an embodiment of the present application, in which light emitting elements 21 in the fingerprint collection area are arranged in an array, and pixel circuits 22 connected to the light emitting elements 21 are connected to light sensing elements 23. The light sensing elements 23 are also arranged in an array and are all located on the right side of the light emitting element 21 connected to the same pixel circuit 22.
Referring to fig. 8, fig. 8 is a schematic diagram illustrating a layout of light emitting elements and light sensing elements in a finger print collecting area of another display panel provided in the embodiment of the present application, which is different from the layout illustrated in fig. 7 in that in the layout illustrated in fig. 8, the light sensing elements 23 are all located on the left side of the light emitting elements 21 connected to the same pixel circuit 22.
Referring to fig. 9, fig. 9 is a schematic diagram illustrating a layout of light-emitting elements and light-sensing elements in a finger print collecting area in another display panel provided in this embodiment of the present application, where the light-emitting elements 21 and the light-sensing elements 23 are located in a same array, in the array, the light-emitting elements 21 and the light-sensing elements 23 in a same row are alternately arranged, and the light-emitting elements 21 and the light-sensing elements 23 in a same column are alternately arranged.
Referring to fig. 10, fig. 10 is a schematic diagram illustrating a layout of light-emitting elements and light-sensing elements in a finger print capturing area of another display panel provided in this embodiment of the present application, in which the light-emitting elements 21 are arranged in a first array and the light-sensing elements 23 are arranged in a second array; in the first array, one photosensitive element 23 is provided between any four light emitting elements 21 of 2 × 2; in the second array, one light emitting element 21 is provided between any four photosensitive elements 23 of 2 × 2.
Referring to fig. 11, fig. 11 is a schematic diagram illustrating a layout manner of light emitting elements and light sensing elements in a finger print collecting area in another display panel provided in this embodiment of the present application, which is different from the manner illustrated in fig. 10 in that the light sensing element 23 in fig. 10 is located at a lower right side of the light emitting element 21 connected to the same pixel circuit 22, and in that the light sensing element 23 in fig. 11 is located at an upper left side of the light emitting element 21 connected to the same pixel circuit 22.
In the embodiment of the present application, the light receiving element 23 may be disposed to surround the light emitting element 21 in a direction perpendicular to the display panel, with respect to the light receiving element 23 and the light emitting element 21 connected to the same pixel circuit 22. At this time, the layout of the light emitting elements 21 and the light sensing elements 23 in the finger print capturing area in the display panel may be as shown in fig. 12.
When the light emitting elements 21 are arranged in an array, the photosensitive element 23 is not limited to be located on one side of the light emitting elements 21 as schematically shown in fig. 7 to 11, and the photosensitive element 23 may be arranged to surround the light emitting elements 21 connected to the same pixel circuit 22.
Referring to fig. 12, fig. 12 is a schematic diagram illustrating a layout of light-emitting elements and light-sensing elements in a finger print capturing area in a display panel provided in an embodiment of the present application, in which the display panel has a first color light-emitting element P1, a second color light-emitting element P2, and a third color light-emitting element P3; any two adjacent columns of the light emitting elements 21, one of which is the second color light emitting element P2, and the other of which includes a plurality of the first color light emitting element P1 and the third color light emitting element P3 arranged in order in the column direction; of any two adjacent rows of light emitting elements, one row is the second color light emitting element P2, and the other row includes a plurality of the first color light emitting element P1 and the third color light emitting element P3 arranged in this order in the row direction; one first color light emitting element P1 or one third color light emitting element P3 among the four second color light emitting elements P2 of arbitrary 2 × 2; in the fingerprint acquisition area, the light sensing element 23 surrounds the light emitting element 21.
The first color light emitting element P1, the second color light emitting element P2 and the third color light emitting element P3 have different luminance decay rates, and the area where the light emitting elements are arranged has a positive correlation with the luminance decay rate thereof, that is, the area is larger as the luminance decay rate is larger.
The first color light emitting element P1 may be a red light emitting element R, the second color light emitting element P2 may be a green light emitting element G, and the third color light emitting element P3 may be a blue light emitting element B. Based on the difference in the luminance decay rates of the three color light emitting elements, the area of the blue light emitting element B having the highest luminance decay rate is set to be the largest, and the area of the green light emitting element G having the lowest luminance decay rate is set to be the smallest.
Referring to fig. 13, fig. 13 is a schematic diagram illustrating a layout of light emitting elements and photosensitive elements in a finger print collecting area in another display panel provided in the embodiment of the present application, in which the arrangement of the light emitting elements is the same as that shown in fig. 12, except that in the arrangement shown in fig. 13, the photosensitive element 23 is located on one side of the light emitting elements.
Theoretically, the sensitivity of the photosensitive element 23 is independent of its area, and the area of each photosensitive element 23 may be different.
However, in view of the difference between the sensitivity of the middle area and the sensitivity of the edge area of the photosensitive elements 23, in order to ensure that the sensitivities of the respective photosensitive elements 23 are uniform, the photosensitive elements 23 are arranged in the same rectangular shape when the photosensitive elements 23 are located on the side where the light emitting elements 21 of the same pixel circuit 22 are connected. When the light receiving element 23 surrounds the light emitting element 21 connected to the same pixel circuit 22, the light receiving element surrounding the small-area light emitting element is provided larger than the light receiving element surrounding the large-area light emitting element.
In the display panel that this application embodiment provided, will be used for gathering photosensitive element 23 of fingerprint information and be used for image display's light-emitting component 21 integration in same pixel circuit 22, through photosensitive element 23 and the specific relation of connection of pixel circuit 22, based on photosensitive element 23 and light-emitting component 21 mutually support, light current when photosensitive element 23 gathers fingerprint information can influence light-emitting component's luminance, can improve the valley ridge potential difference in the fingerprint, thereby improve fingerprint detection's accuracy and precision.
The light sensing element 23 is integrated in the display panel and is positioned in the gap of the light emitting element 21, the resolution of the display panel is not affected, the panel thickness is thinner, the multiplexing pixel circuit 22 is used as a detection circuit for fingerprint identification, a separate fingerprint identification circuit is not needed, and the circuit structure is simplified.
In addition, since the photosensitive element 23 is connected to the first node N1, the compensation transistor M4 can be shared with the light emitting element 21, and the threshold compensation of the driving transistor by the compensation transistor M4 can be performed during the fingerprint detection period, so as to avoid the influence of the TFT threshold difference on the fingerprint identification accuracy.
Based on the foregoing embodiment, another embodiment of the present application further provides an electronic device, where the electronic device is shown in fig. 14, fig. 14 is a schematic structural diagram of the electronic device provided in the embodiment of the present application, and the electronic device 51 includes the display panel of the foregoing embodiment.
In the embodiment of the application, the electronic device 51 includes the electronic device that has display function such as smart mobile phone, panel computer and intelligent wearing equipment, will be used for gathering fingerprint information's photosensitive element integration in display panel, and with display panel's light emitting component integration in same pixel circuit, has reduced panel thickness, has improved fingerprint detection's accuracy and sensitivity simultaneously.
Based on the foregoing embodiment, another embodiment of the present application further provides a control method, used for the foregoing display panel, where the control method includes:
controlling a display panel to perform fingerprint detection and image display in a time-sharing manner;
wherein the content of the first and second substances,
in the image display period, on the basis of a preset first timing signal, controlling the photosensitive element to be disconnected with the first node, and controlling the driving transistor, the first reset transistor and the compensation transistor to control the light-emitting element to perform light-emitting display;
in the fingerprint detection period, the conduction state of the photosensitive element and the pixel circuit is switched based on a preset second time sequence signal, the driving transistor, the first reset transistor and the compensation transistor are controlled, the fingerprint signal related to the photosensitive element detection signal is collected, and the fingerprint signal is output through the first reset transistor.
According to the control method, based on the display panel, the photosensitive element and the light-emitting element are connected in the same pixel circuit, and the photosensitive element is connected to the first node of the pixel circuit, so that the pixel circuit can be multiplexed to serve as a fingerprint detection circuit of the photosensitive element for collecting and outputting fingerprint signals, the compensation transistor in the pixel circuit can be multiplexed to perform threshold compensation on the driving transistor in a fingerprint detection time period, and the influence of TFT threshold difference in different fingerprint detection circuits of different fingerprint sensing units (photosensitive elements) on fingerprint detection accuracy is reduced.
The following describes the control method according to the embodiment of the present application with reference to a specific timing diagram, taking the pixel circuit 7T1C shown in fig. 2 as an example. Here, the transistors are all PMOS as an example, and PMOS is turned on at low level and turned off at high level.
In one mode, in the fingerprint detection period, as shown in fig. 15, fig. 15 is a timing diagram of a second timing signal provided in the embodiment of the present application, where the second timing signal includes: a first control signal SW, a second control signal S1, a third control signal S2, and an emission signal EMT. At this time, the control method includes:
step S11: when the photosensitive element 23 is disconnected from the first node N1, the first reset transistor M5 is controlled to be turned on, and the voltage of the first node N1 is reset. Specifically, in the first time period T1, the first control signal SW is at a high level to control the first control transistor M8 to be turned off, the second control signal S1 is at a low level to control the first reset transistor M5 to be turned on, and the second pole of the first reset transistor M5 inputs the reset signal Vref to reset the voltage of the first node N1.
Step S12: after the first reset transistor M5 is turned off, the compensation transistor M4 is controlled to be turned on, and the data voltage is written into the second pole of the driving transistor M3. Specifically, in the second time period T2, the second control signal S1 is at a high level, the first reset transistor M5 is turned off, the third control signal S2 is at a low level, the compensation transistor M4 and the data write transistor M2 are both controlled to be turned on, and the potentials of the nodes are as follows:
VN2＝Vdata
VN1＝VN3＝Vdata-|Vth|
where Vth represents the threshold voltage of the driving transistor M3. VN1Represents the potential of the first node N1; vN2Represents the potential of the second node N2; vN3Indicating the potential of the third node N3. The second pole of the driving transistor M3 is connected to the second node N2, and the first pole is connected to the third node N3.
Step S13: turning off the compensation transistor M4 and writing the data voltage into the second pole of the driving transistor M3, controlling the photosensitive element 23 to be connected to the first node N1, and pulling down the voltage of the first node N1 based on the detection signal of the photosensitive element 23; the light receiving element 23 generates a detection signal based on light emitted from a third light emitting element connected to a different pixel circuit 22 from the light receiving element 23. Specifically, in the third time period T3, the third control signal S2 is at a high level, the compensation transistor M4 and the data writing transistor M2 are both controlled to be turned off, the first control signal SW is at a low level, the first control transistor M8 is controlled to be turned on, the first node N1 and the first control transistor M8 are turned on, the light sensing element 23 senses the radiation of the light emitted by the third light emitting element, and generates the detection signal (the light generation current of the light sensing element 23), where the potential of the first node N1 is:
VN1＝Vdata-|Vth|-△V
where Δ V represents a voltage drop of the detection signal generated by the photosensitive element 23 against the difference of the first node N1.
Step S14: the photosensitive element 23 is controlled to be disconnected from the first node N1, and the fourth light emitting element is controlled to emit light for display based on the data voltage Vdata written in the second pole of the driving transistor M3; the fourth light emitting element is connected to the same pixel circuit 22 as the light receiving element 23. Specifically, during the fourth time period T4, the first control signal SW is at a high level, which controls the first control transistor M8 to turn off and disconnect with the first node N1, the emission signal EMT is at a low level, which controls both the second control transistor M6 and the third control transistor M1 to turn on, and the potential of the second node N2 is:
VN2＝PVDD
since the driving transistor M3 is operated in the saturation region, the driving current of the fourth light emitting element is:
Ids＝k(VN2-VN1-|Vth|)2
＝k(PVDD-Vdata+|Vth|+ΔV-|Vth|)2
＝k(PVDD-Vdata+ΔV)2
here, Δ V is positively correlated with the detection signal of the photosensitive element 23, so that the driving current Ids can be increased based on the detection signal, thereby increasing the luminance of the fourth light emitting element.
Step S15: the light emitting element 21 and the pixel circuit break 22 are controlled to control the first reset transistor M5 to be turned on to output the fingerprint signal. Specifically, in the fifth time period T5, the light emitting signal EMT is at a high level, the second control transistor M6 and the third control transistor M1 are both controlled to be turned off, the second control signal S1 is at a low level, the first reset transistor M5 is controlled to be turned on, the second pole of the first reset transistor M5 outputs the current potential of the first node N1, which is used for reading the fingerprint signal, and the second pole of the first reset transistor M5 does not input the reset signal Vref, so that the fingerprint detection function is realized.
In another mode, in the fingerprint detection period, as shown in fig. 16, fig. 16 is a timing diagram of another second timing signal provided in the embodiment of the present application, and similarly, the second timing signal includes: a first control signal SW, a second control signal S1, a third control signal S2, and an emission signal EMT. At this time, the control method includes:
step S21: when the photosensitive element 23 is disconnected from the first node N1, the first reset transistor M5 is controlled to be turned on, and the voltage of the first node N1 is reset; the step sequence is the same as step S11 described above.
Step S22: after the first reset transistor M5 is turned off, the compensation transistor M4 is controlled to be turned on, and the data voltage is written into the second pole of the driving transistor M3; the step sequence is the same as step S12 described above.
Step S23: turning off the compensation transistor M4 and writing the data voltage of the second pole of the driving transistor M3, controlling the fourth light emitting element to emit light for display based on the data voltage Vdata written in the second pole of the driving transistor M3, controlling the photosensitive element 23 to be conductive with the first node N1, and pulling down the voltage of the first node N1 based on the detection signal of the photosensitive element 23; the photosensitive element 23 generates a detection signal based on light emitted by a fourth light-emitting element, and the fourth light-emitting element is connected with the same pixel circuit 22 as the photosensitive element 23; specifically, in the third time period T3, the third control signal S2 is at a high level, the compensation transistor M4 and the data writing transistor M2 are both controlled to be turned off, the emission signal EMT is at a low level, the second control transistor M6 and the third control transistor M1 are both controlled to be turned on, so as to control the fourth light emitting element to emit light for display, the first control signal SW is at a low level, the first control transistor M8 is controlled to be turned on, the first node N1 and the first control transistor M8 are controlled to be turned on, the photosensitive element 23 senses the third light emitting element to emit light, generates the detection signal, and pulls the potential of the first node N1 low, at this time:
VN1＝Vdata-|Vth|-△V
VN2＝PVDD
also, since the driving transistor M3 is operated in the saturation region, the driving current Ids of the fourth light emitting element at this time is:
Id＝k(N2-N1-|Vth|)2
＝k(PVDD-Vdata+|Vth|+ΔV-|Vth|)2
＝k(PVDD-Vdata+ΔV)2
the driving current Ids can be increased based on the detection signal, thereby increasing the luminance of the fourth light emitting element.
Step S24: the light emitting element 21 and the light sensing element 23 are both controlled to be disconnected from the pixel circuit 22, and the first reset transistor M5 is controlled to be turned on to output a fingerprint signal. Specifically, in the fourth time period T4, the light emitting signal EMT is at a high level, the second control transistor M6 and the third control transistor M1 are both controlled to be turned off, the second control signal S1 is at a low level, the first reset transistor M5 is controlled to be turned on, the second pole of the first reset transistor M5 outputs the current potential of the first node N1, which is used for reading the fingerprint signal, and the second pole of the first reset transistor M5 does not input the reset signal Vref, so that the fingerprint detection function is realized.
The embodiments in the present description are described in a progressive manner, or in a parallel manner, or in a combination of a progressive manner and a parallel manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other. For the control method and the electronic device disclosed by the embodiment, the description is relatively simple because the control method and the electronic device correspond to the display panel disclosed by the embodiment, and relevant points can be described by referring to corresponding parts of the display panel.
It should be noted that in the description of the present application, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only used for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present application. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (17)

1. A display panel, characterized in that the display panel has a display area having a light emitting element and a pixel circuit connected to the light emitting element;
the pixel circuit includes: a driving transistor for supplying a driving current to the light emitting element to make the light emitting element emit light; the grid electrode of the driving transistor is connected with a first node; a first reset transistor for voltage resetting the first node; a compensation transistor connected between the first node and the first pole of the driving transistor for performing threshold voltage compensation on the driving transistor;
a photosensitive element connected to the first node;
wherein the display panel has an image display period and a fingerprint detection period;
in the image display period, the photosensitive element is disconnected with the first node, and the driving transistor, the first reset transistor and the compensation transistor are used for controlling the light-emitting element to perform light-emitting display based on a preset first timing signal;
in the fingerprint detection time interval, the photosensitive element is used for switching the on state of the pixel circuit based on a preset second time sequence signal, and the driving transistor, the first reset transistor and the compensation transistor are used for collecting the fingerprint signal related to the photosensitive element detection signal based on the second time sequence signal and outputting the fingerprint signal through the first reset transistor.
2. The display panel according to claim 1, wherein the light sensing element is connected to the first node through a first control transistor;
the positive electrode of the photosensitive element is input with a preset voltage; the grid electrode of the first control transistor is used for inputting a first control signal, the first pole of the first control transistor is connected with the negative pole of the photosensitive element, and the second pole of the first control transistor is connected with the first node.
3. The display panel according to claim 2, wherein a gate of the first reset transistor is used for inputting a second control signal, a first pole of the first reset transistor is used for inputting a reset signal and outputting the fingerprint signal in a time-sharing manner, and a second pole of the first reset transistor is connected to the first node;
the gate of the compensation transistor is used for inputting a third control signal, the first pole of the compensation transistor is connected with the first node, and the second pole of the compensation transistor is connected with the first pole of the driving transistor.
4. The display panel according to claim 1, wherein the display region has a first sub-display region and a second sub-display region that do not overlap in a direction perpendicular to the display panel, the first sub-display region is a fingerprint collection region, and the pixel circuits to which the light emitting elements are connected in the first sub-display region are connected with the light sensing elements.
5. The display panel according to claim 1, wherein the display regions are fingerprint collection regions, and the pixel circuits to which the light emitting elements are connected with the light sensing elements.
6. The display panel according to claim 1, characterized in that the display panel comprises: a light emitting element that emits red light, a light emitting element that emits green light, and a light emitting element that emits blue light;
the photosensitive element is used for sensing light rays emitted by the first light emitting element, the first light emitting element emits red light or green light, and the first light emitting element and the photosensitive element are connected with the same pixel circuit.
7. The display panel according to claim 1, characterized in that the display panel comprises: a light emitting element that emits red light, a light emitting element that emits green light, and a light emitting element that emits blue light;
the photosensitive element is used for sensing light rays emitted by the second light emitting element, the second light emitting element emits red light or green light, and the second light emitting element and the photosensitive element are connected with different pixel circuits.
8. The display panel according to claim 1, wherein the display panel comprises an array substrate including the pixel circuit; in the direction perpendicular to the array substrate, the photosensitive element and the light emitting element do not overlap.
9. The display panel of claim 8, wherein the array substrate has a pixel defining layer thereon, the pixel defining layer having a plurality of pixel openings; the light emitting element is positioned in the pixel opening;
the light-emitting functional layer of the photosensitive element is positioned on one side of the array substrate, which is provided with the pixel defining layer, and the photosensitive element is not overlapped with the pixel opening in the direction perpendicular to the array substrate.
10. The display panel according to claim 9, wherein the light-sensing element comprises:
a negative electrode disposed on the array substrate;
the photosensitive functional layer is arranged on one side, away from the array substrate, of the negative electrode;
and the positive electrode is arranged on one side of the photosensitive functional layer, which deviates from the array substrate.
11. The display panel according to claim 10, wherein the negative electrode is provided in the same layer as an anode of the light-emitting element; the anode and the cathode of the light-emitting element are arranged in the same layer;
the cathode of the light-emitting element is provided with an opening, the anode is positioned in the opening, and the anode and the orthographic projection of the cathode of the light-emitting element on the array substrate do not overlap.
12. The display panel according to claim 1, wherein the light-receiving element and the light-emitting element which are connected to the same pixel circuit surround the light-emitting element in a direction perpendicular to the display panel.
13. The display panel according to claim 1, wherein the photosensitive element and the light-emitting element connected to the same pixel circuit are located on one side of the light-emitting element in a direction perpendicular to the display panel.
14. An electronic device characterized by comprising the display panel according to any one of claims 1 to 13.
15. A control method of the display panel according to any one of claims 1 to 13, comprising:
controlling the display panel to perform fingerprint detection and image display in a time-sharing manner;
wherein the content of the first and second substances,
in an image display period, based on a preset first timing signal, controlling the photosensitive element to be disconnected with the first node, and controlling the driving transistor, the first reset transistor and the compensation transistor to control the light-emitting element to perform light-emitting display;
and in the fingerprint detection time period, based on a preset second time sequence signal, switching the conduction state of the photosensitive element and the pixel circuit, controlling the driving transistor, the first reset transistor and the compensation transistor, collecting a fingerprint signal related to the photosensitive element detection signal, and outputting the fingerprint signal through the first reset transistor.
16. The control method according to claim 15, during the fingerprint detection period, the control method comprising:
when the photosensitive element is disconnected with the first node, the first reset transistor is controlled to be conducted, and voltage reset is carried out on the first node;
after the first reset transistor is turned off, controlling the compensation transistor to be conducted, and simultaneously writing data voltage into the second pole of the driving transistor;
turning off the compensation transistor and writing data voltage of a second pole of the driving transistor, controlling the photosensitive element to be conducted with the first node, and pulling down the voltage of the first node based on a detection signal of the photosensitive element; the photosensitive element generates the detection signal based on light emitted by a third light-emitting element, and the third light-emitting element is connected with different pixel circuits of the photosensitive element;
controlling the photosensitive element to be disconnected with the first node, and controlling a fourth light-emitting element to emit light to display based on the data voltage written in the second pole of the driving transistor; wherein the fourth light emitting element is connected to the same pixel circuit as the light sensing element;
and controlling the light-emitting element and the pixel circuit to be disconnected, and controlling the first reset transistor to be conducted so as to output the fingerprint signal.
17. The control method according to claim 15, during the fingerprint detection period, the control method comprising:
when the photosensitive element is disconnected with the first node, the first reset transistor is controlled to be conducted, and voltage reset is carried out on the first node;
after the first reset transistor is turned off, controlling the compensation transistor to be conducted, and simultaneously writing data voltage into the second pole of the driving transistor;
turning off the compensation transistor and writing data voltage of a second pole of the driving transistor, controlling a fourth light-emitting element to emit light to display based on the data voltage written by the second pole of the driving transistor, controlling the photosensitive element to be connected with the first node, and pulling down the voltage of the first node based on a detection signal of the photosensitive element; the photosensitive element generates the detection signal based on the light emitted by the fourth light-emitting element, and the fourth light-emitting element is connected with the same pixel circuit as the photosensitive element;
and controlling the light-emitting element and the photosensitive element to be disconnected with the pixel circuit, and controlling the first reset transistor to be conducted so as to output the fingerprint signal.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI802386B (en) * 2022-04-25 2023-05-11 大陸商北京歐錸德微電子技術有限公司 Pixel circuit, OLED display device and information processing device
WO2024000349A1 (en) * 2022-06-30 2024-01-04 京东方科技集团股份有限公司 Composite drive circuit, display panel and display apparatus
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