CN111951733A - Pixel driving circuit, driving method thereof, display panel and display device - Google Patents
Pixel driving circuit, driving method thereof, display panel and display device Download PDFInfo
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- CN111951733A CN111951733A CN202010864423.3A CN202010864423A CN111951733A CN 111951733 A CN111951733 A CN 111951733A CN 202010864423 A CN202010864423 A CN 202010864423A CN 111951733 A CN111951733 A CN 111951733A
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- 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]
- G09G3/3225—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] using an active matrix
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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
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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
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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Abstract
The embodiment of the application provides a pixel driving circuit, a driving method thereof, a display panel and a display device. The pixel driving circuit includes a pixel driving part, a touch detection part and an electroluminescent element, the touch detection part is configured to input an off signal to the pixel driving part to make the pixel driving part control the electroluminescent element not to emit light when the touch detection part is in a touch state, and is configured to input a touch detection signal to the sensing signal line in response to a second control signal input from a second control terminal when the touch detection part is in the touch state. The pixel driving circuit provided by the embodiment not only realizes that the touch detection part can realize the acquisition of the touch detection signal through the control signal of the common pixel driving part, but also enables the pixel driving part to control the electroluminescent element not to emit light when the touch detection part is in a touch state, thereby being beneficial to reducing the power consumption of the display device and saving the electric energy.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a pixel driving circuit, a driving method thereof, a display panel, and a display device.
Background
Organic Light-Emitting diodes (OLEDs) are used for display, and OLED display devices have the advantages of ultra-Light weight, ultra-thin thickness, high brightness, large viewing angle, low voltage, low power consumption, fast response, high definition, shock resistance, flexibility, low cost, wide temperature range, and the like, so the OLED display technology is considered as a new generation display technology with the greatest development prospect.
In order to meet the requirement of OLED display, the existing OLED products generally have a touch function, but in the touch process, although the portion shielded by the finger cannot be observed by human eyes, the portion still emits light, which is not favorable for reducing the power consumption of the OLED display device.
Disclosure of Invention
The pixel driving circuit, the driving method thereof, the display panel and the display device are provided to overcome the defects of the conventional mode, so that the pixels in the area shielded by fingers do not emit light, and the power consumption of the OLED display device can be reduced.
In a first aspect, an embodiment of the present application provides a pixel driving circuit, including a pixel driving portion, a touch detection portion, and an electroluminescent element;
the electroluminescent element is electrically connected with a first power supply terminal and the pixel driving part respectively;
the pixel driving part is respectively electrically connected with the touch detection part, the second power supply end, the first control end and the data writing end, is configured to respond to a first control signal input by the first control end and a data signal input by the data writing end to form a driving signal, and drives the electroluminescent element to emit light according to the driving signal;
the touch detection part is electrically connected with the first power terminal, the second control terminal and the sensing signal line, respectively, is configured to input a turn-off signal to the pixel driving part to make the pixel driving part control the electroluminescent element not to emit light when the touch detection part is in a touch state, and is configured to input a touch detection signal to the sensing signal line in response to a second control signal input from the second control terminal when the touch detection part is in the touch state.
Optionally, the pixel driving portion includes a storage module, a data writing module, and a driving module, the storage module includes a first end and a second end, the first end is electrically connected to the data writing module and the driving module, respectively, and the second end is electrically connected to the second power source terminal; the data writing module is respectively electrically connected with the first control end, the data writing end and the control end of the driving module, and is configured to respond to a first control signal of the first control end, store a current data signal input by the data writing end into the storage module until the voltage of the first end of the storage module reaches a set voltage, and write the set voltage into the control end of the driving module; the driving module is electrically connected to the electroluminescent element, the second power source terminal, and the touch detection part, and is configured to be turned on in response to the set voltage and drive the electroluminescent element to emit light according to the current data signal, and to be turned off in response to the turn-off signal so that the electroluminescent element does not emit light.
Optionally, the touch detection part comprises a touch signal sensing module, a touch signal detection module and a light emitting control module; the touch signal sensing module is respectively electrically connected with the second power end, the touch signal detection module and the light-emitting control module, and is configured to generate a sensing signal and send the sensing signal to the touch signal detection module and the light-emitting control module when the touch detection part is in a touch state; the touch signal detection module is electrically connected with the second control terminal, the sensing signal line and the first power terminal respectively, and is configured to respond to the second control signal and the sensing signal, to conduct the sensing signal line and the first power terminal so that the first power terminal charges the sensing signal line, and to use a current on the sensing signal line as a touch detection signal; the light emission control module is electrically connected to the pixel driving part and configured to input a turn-off signal to the pixel driving part in response to the sensing signal.
Optionally, the data writing module includes a first transistor, a second transistor and a third transistor, and the driving module includes a fourth transistor; a gate of the first transistor is electrically connected to the first control terminal, a first electrode of the first transistor is electrically connected to the data writing terminal, and a second electrode of the first transistor is electrically connected to a first electrode of the third transistor; a gate of the second transistor is electrically connected to the first control terminal, a first electrode of the second transistor is electrically connected to the data writing terminal, and a second electrode of the second transistor is electrically connected to the first control terminal, a gate of the third transistor, a first terminal of the memory module, and a gate of the fourth transistor, respectively;
a second pole of the third transistor is electrically connected to the second power terminal; a first electrode of the fourth transistor is electrically connected to the electroluminescent element, and a second electrode of the fourth transistor is electrically connected to the second power source terminal.
Optionally, the touch signal sensing module includes a sensing electrode and a sensing capacitor, and the light-emitting control module includes a sixth transistor; the induction capacitor is electrically connected with the second power supply end and the induction electrode respectively; the sensing electrode is electrically connected with the grid electrode of the sixth transistor, the first electrode of the sixth transistor is electrically connected with the grid electrode of the fourth transistor, and the second electrode of the sixth transistor is electrically connected with the second power supply end.
Optionally, the touch signal detection module includes a seventh transistor and an eighth transistor, a gate of the seventh transistor is electrically connected to the sensing electrode, a first electrode of the seventh transistor is electrically connected to a second electrode of the eighth transistor, and a second electrode of the seventh transistor is electrically connected to the first power supply terminal; the grid electrode of the eighth transistor is electrically connected with the second control end, and the first electrode of the eighth transistor is electrically connected with the sensing signal line.
Optionally, the pixel driving part and the touch detection part are further electrically connected to a reset terminal respectively; the pixel driving part further comprises a first reset module electrically connected to the reset terminal, the first terminal of the memory module and the second power terminal, respectively, and configured to reset a voltage of the first terminal of the memory module in response to a reset signal input from the reset terminal; the touch detection part further comprises a second reset module, wherein the second reset module is respectively electrically connected with the reset terminal, the pixel driving part and the touch signal induction module and is configured to reset the voltage of the touch signal induction module in response to a reset signal input by the reset terminal.
Optionally, the first reset module includes a fifth transistor, a gate of the fifth transistor is electrically connected to the reset terminal, a first pole of the fifth transistor is electrically connected to the second power supply terminal, and a second pole of the fifth transistor is electrically connected to the first terminal of the memory module and the gate of the fourth transistor, respectively; the second reset module comprises a sixth transistor, a grid electrode of the sixth transistor is electrically connected with the reset end, a first pole of the sixth transistor is electrically connected with the induction electrode, and a second pole of the sixth transistor is electrically connected with the first end of the storage module.
In a second aspect, the present application provides a display panel including the pixel driving circuit described above.
In a third aspect, embodiments of the present application provide a display device, which includes the display panel described above.
In a fourth aspect, an embodiment of the present application provides a driving method for driving the pixel driving circuit, where the driving method includes:
a reset phase, in which the reset terminal receives a reset signal, the pixel driving part performs voltage reset on the pixel driving part in response to the reset signal, and the touch detection part performs voltage reset on the touch detection part in response to the reset signal;
in the data writing stage, the first control end receives a first control signal, the data writing end receives a current data signal, the pixel driving part responds to the first control signal and the current data signal to form a driving signal, and the touch detection part maintains the current state;
in the lighting stage, the second control end receives a second control signal, and when the touch detection part is in a touch state, the touch detection part responds to the second control signal to input a touch detection signal to the induction signal line; the pixel driving part drives the electroluminescent element to emit light according to the driving signal, and inputs a disconnection signal to the pixel driving part when the touch detection part is in a touch state so that the pixel driving part controls the electroluminescent element not to emit light.
The technical scheme provided by the embodiment of the application has the following beneficial technical effects:
the pixel driving circuit, the driving method thereof, the display panel and the display device provided by the embodiment of the application not only realize that the touch detection part can realize the collection of the touch detection signal by sharing the control signal of the pixel driving part, but also enable the pixel driving part to control the electroluminescent element not to emit light when the touch detection part is in a touch state, so that the pixels of the part of the display device touched by fingers (or other parts of a human body) do not emit light, thereby being beneficial to reducing the power consumption of the display device and saving electric energy.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic block diagram of a pixel driving circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic block diagram of another pixel driving circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic block diagram of another pixel driving circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic block diagram of a pixel driving circuit according to another embodiment of the present disclosure;
fig. 5 is a specific circuit diagram corresponding to a module structure schematic diagram based on the pixel driving circuit shown in fig. 4 according to an embodiment of the present disclosure;
fig. 6 is a schematic block diagram of another pixel driving circuit according to an embodiment of the present disclosure;
fig. 7 is a specific circuit diagram corresponding to a module structure schematic diagram based on the pixel driving circuit shown in fig. 6 according to an embodiment of the present disclosure;
fig. 8 is a schematic partial structure diagram of a display panel according to an embodiment of the present disclosure;
fig. 9 is a schematic diagram of a frame structure of a display device according to an embodiment of the present disclosure;
fig. 10 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present disclosure;
fig. 11 is a timing diagram corresponding to the specific structure of the pixel driving circuit shown in fig. 10.
Reference numerals:
1-a pixel driving section; 11-a storage module; 12-a data write module; 13-a drive module; 14-a first reset module;
2-a touch detection part; 21-a touch signal sensing module; 211-a sensing electrode; 22-touch signal detection module; 23-a light emission control module; 24-a second reset module;
3-an electroluminescent element;
CON 1-first control end; CON 2-second control end; v1-first power supply terminal; v2-second power supply terminal; Data-Data write-in; an SL-sense signal line; Reset-Reset terminal;
t1 — first transistor; t2 — second transistor; t3 — third transistor; t4 — fourth transistor; t5 — fifth transistor; t6 — sixth transistor; t7-seventh transistor; t8 — eighth transistor; t9 — ninth transistor;
c1 — storage capacitance; c2-sense capacitance.
Detailed Description
Reference will now be made in detail to the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts or parts having the same or similar functions throughout. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present application, it is omitted. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The inventor of the present application considers that the existing OLED products generally have a touch function, but in the touch process, although the portion blocked by the finger cannot be observed by human eyes, the portion still emits light, which is not favorable for reducing the power consumption of the OLED display device.
The present application provides a pixel driving circuit, a driving method thereof, a display panel and a display device, which are used to solve the above technical problems in the prior art.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments.
The embodiment of the present application provides a pixel driving circuit, as shown in fig. 1, the pixel driving circuit provided in this embodiment includes a pixel driving portion 1, a touch detection portion 2, and an electroluminescent element 3;
the electroluminescent element 3 is electrically connected to the first power supply terminal V1 and the pixel driving section 1, respectively;
the pixel driving part 1 is electrically connected with the touch detection part 2, the second power source terminal V2, the first control terminal CON1 and the Data write terminal Data, respectively, is configured to respond to a first control signal input by the first control terminal CON1 and a Data signal input by the Data write terminal Data to form a driving signal, and drives the electroluminescent element 3 to emit light according to the driving signal;
the touch sensing part 2 is electrically connected to the first power source terminal V1, the second power source terminal V2, the second control terminal CON2, and the sense signal line, respectively, is configured to input an off signal to the pixel driving part 1 to make the pixel driving part 1 control the electroluminescent element 3 not to emit light when the touch sensing part 2 is in a touch state, and is configured to input a touch sensing signal to the sense signal line in response to a second control signal input from the second control terminal CON2 when the touch sensing part 2 is in a touch state.
In this embodiment, it is not only achieved that the touch detection portion 2 can collect the touch detection signal by sharing the control signal of the pixel driving portion 1, but also that the pixel driving portion 1 controls the electroluminescent element 3 not to emit light when the touch detection portion 2 is in a touch state, so that the pixels of the portion of the display device touched by a finger (or other portion of a human body) do not emit light, which is beneficial to reducing the power consumption of the display device and saving electric energy.
Alternatively, as shown in fig. 2, in the pixel driving circuit provided in this embodiment, the pixel driving portion 1 includes a memory module 11, a data writing module 12, and a driving module 13, the memory module 11 includes a first terminal and a second terminal, the first terminal is electrically connected to the data writing module 12 and the driving module 13, respectively, and the second terminal is electrically connected to the second power supply terminal V2; the Data writing module 12 is electrically connected to the first control terminal CON1, the Data writing terminal Data, and the control terminal of the driving module 13, and configured to store the current Data signal input by the Data writing terminal Data to the storage module 11 in response to the first control signal received by the first control terminal CON1 until the voltage of the first terminal of the storage module 11 reaches a set voltage, and write the set voltage to the control terminal of the driving module 13; the driving module 13 is also electrically connected to the electroluminescent element 3, the second power source terminal V2 and the touch detection part 2, respectively, and is configured to be turned on in response to a set voltage and to drive the electroluminescent element 3 to emit light according to the current data signal, and to be turned off in response to a turn-off signal to make the electroluminescent element 3 emit no light.
Further, as shown in fig. 3, in the pixel driving circuit provided in this embodiment, the touch detection portion 2 includes a touch signal sensing module 21, a touch signal detection module 22 and a light emitting control module 23; the touch signal sensing module 21 is electrically connected to the second power terminal V2, the touch signal detecting module 22 and the light-emitting control module 23, respectively, and is configured to generate a sensing signal and send the sensing signal to the touch signal detecting module 22 and the light-emitting control module 23 when the touch detection part 2 is in a touch state; the touch signal detecting module 22 is electrically connected to the second control terminal CON2, the sensing signal line and the first power terminal V1, respectively, and is configured to turn on the sensing signal line and the first power terminal V1 in response to the second control signal and the sensing signal to charge the sensing signal line with the first power terminal V1 and to take a current on the sensing signal line as a touch detection signal; the light emission control module 23 is electrically connected to the pixel driving part 1 and configured to input a turn-off signal to the pixel driving part 1 in response to the sensing signal.
Specifically, as shown in fig. 4, the light emission control module 23 is electrically connected to the driving module 13 to electrically connect the light emission control module 23 to the pixel driving part 1, and when the light emission control module 23 receives the sensing signal, a disconnection signal is input to the driving module 13 to disconnect the driving module 13, so that the electroluminescence unit does not emit light.
When a finger is covered in a certain area of the display screen, and the touch signal sensing module 21 in the area covered by the finger is in a touch state, the electroluminescent element 3 corresponding to each pixel in the area does not emit light. Because the picture of the area covered by the finger cannot be observed by human eyes, the display effect cannot be influenced because the pixels of the area covered by the finger do not emit light, but the power consumption of the display device can be reduced and the purpose of saving electric energy can be achieved because the pixels of the area covered by the finger do not emit light.
Specifically, each of the modules included in each of the pixel driving section 1 and the touch detection section 2 may be implemented by using components in a specific circuit as shown in fig. 5, which will be described in detail below.
As shown in fig. 5, the electroluminescent element 3 in the present embodiment is an Organic Light Emitting Diode (OLED), and the following embodiments will describe an OLED as the electroluminescent element 3.
As shown in FIG. 5, the following embodiment will use the first power supply terminal V1 as the anode power supply terminal VDDThe second power supply terminal V2 is the cathode power supply terminal VSSThe following description will be given taking an example in which each transistor in the circuit is an N-type transistor.
As shown in fig. 5, in some embodiments, the data writing block 12 includes a first transistor T1, a second transistor T2, and a third transistor T3, and the driving block 13 includes a fourth transistor T4; a gate of the first transistor T1 is electrically connected to the first control terminal CON1, a first pole of the first transistor T1 is electrically connected to the Data write terminal Data, and a second pole of the first transistor T1 is electrically connected to the first pole of the third transistor T3; the gate of the second transistor T2 is electrically connected to the first control terminal CON1, the first pole of the second transistor T2 is electrically connected to the Data write terminal Data, and the second pole of the second transistor T2 is electrically connected to the first control terminal CON1, the gate of the third transistor T3, the first terminal of the memory module 11, and the gate of the fourth transistor T4, respectively; a second pole of the third transistor T3 is electrically connected to the second power source terminal V2; a first electrode of the fourth transistor T4 is electrically connected to the electroluminescent element 3, and a second electrode of the fourth transistor T4 is electrically connected to the second power source terminal V2.
Specifically, as shown in fig. 5, the memory module 11 includes a storage capacitor C1, a Data write terminal Data input current Data signal IdataIn specific implementation, a voltage-to-current module 4 may be provided before the Data write-in terminal Data to convert the Data signal in the form of voltage into a current Data signal Idata。
Since the gates of the fourth transistor T4 and the third transistor T3 are electrically connected, i.e., the gates of the fourth transistor T4 and the third transistor T3 are at the same potential, a current flowing through the fourth transistor T4, i.e., a driving current, according to the current mirror principle
Wherein
Wherein μ is the field effect mobility; cOXCapacitance per unit area of insulating layer, W3And L3Is the channel width and length, W, of the third transistor T34And L4Is the channel width and length of the fourth transistor T4. Since the third transistor T3 and the fourth transistor T4 are the same process, μ 3 and μ 4 are the same, COX3And COX4Are identical, i.e. that
Is a constant. Accordingly, the ratio of the widths of the third transistor T3 and the fourth transistor T4 can be set in advance to determine the driving powerThe ratio of the current to the current data signal is preferably such that the width-to-length ratio of the fourth transistor T4 is greater than the width-to-length ratio of the third transistor to obtain a greater drive current.
Since the transistors in the circuit are fabricated at the same time, the third transistor T3 and the fourth transistor T4 can have the same turn-on voltage. When the first control terminal CON1 receives the first control signal, the first transistor T1 and the second transistor T2 are turned on, the current Data signal inputted from the Data write terminal Data flows through the second transistor T2 to charge the storage capacitor C1 until the potential of the first terminal of the storage capacitor C1 reaches the on potential of the third transistor T3, the third transistor T3 is turned on, the gate of the fourth transistor T4 is connected to the gate of the third transistor T3, and the fourth transistor T4 is turned on at the same time.
In the present embodiment, driving of the electroluminescent element 3 is realized by the data signal in the form of a current, so that the gate potential of the fourth transistor T4 as a driving transistor can be kept stable, i.e., the fourth transistor T4 is ensured to operate in the saturation region during the light emission phase, without considering the influence of the threshold voltage Vth.
As shown in fig. 5, in some embodiments, the touch signal sensing module includes a sensing electrode and a sensing capacitor C2, and the light emitting control module 23 includes a sixth transistor T6; the sensing capacitor C2 is electrically connected with the second power supply end V2 and the sensing electrode respectively; the sensing electrode the gate of the sixth transistor T6 is electrically connected, the first pole of the sixth transistor T6 is electrically connected to the gate of the fourth transistor T4, and the second pole of the sixth transistor T6 is electrically connected to the second power source terminal V2.
As shown in fig. 5, in some embodiments, the touch signal detection module includes a seventh transistor T7 and an eighth transistor T8, a gate of the seventh transistor T7 is electrically connected to the sensing electrode, a first electrode of the seventh transistor T7 is electrically connected to a second electrode of the eighth transistor T8, and a second electrode of the seventh transistor T7 is electrically connected to the first power source terminal V1; a gate of the eighth transistor T8 is electrically connected to the second control terminal CON2, and a first pole of the eighth transistor T8 is electrically connected to the sensing signal line.
It should be noted that the pixel driving circuits and the sensing electrodes may be in one-to-one correspondence, or a plurality of pixel driving circuits may share one sensing electrode, so as to reduce the difficulty in manufacturing the sensing electrode.
Specifically, as shown in fig. 5, when the finger performs a touch operation, a capacitor is formed between the finger and the sensing electrode in the area covered by the finger, and since the human body is positively charged, the potential of the sensing electrode is increased, that is, the potential of the point d is increased, so that the sixth transistor T6 is turned on, the sixth transistor T6 is turned on, so that the gate of the fourth transistor T4 is turned on with the second power terminal V2, so that the fourth transistor T4 is turned off, and the electroluminescent element 3 cannot emit light, so as to achieve the purpose of saving electric energy.
Specifically, as shown in fig. 5, when the second control terminal CON2 inputs the second control signal, the eighth transistor T8 is turned on, and if the sensing electrode is in a touch state at this time, the rising of the potential at the point d can turn on the seventh transistor T7, thereby charging the first power terminal V1 to the sensing signal line and taking the voltage of the first voltage terminal as the touch detection signal; if the sensing electrode is in a non-touch state, the potential at the point d is low and the seventh transistor T7 cannot be turned on, and no signal is collected by the sensing signal line. Therefore, the detection of the touch signal can be realized.
Alternatively, as shown in fig. 6, in the pixel driving circuit provided in this embodiment, the pixel driving part 1 and the touch detection part 2 are further electrically connected to the Reset terminal Reset respectively; the pixel driving section 1 further includes a first Reset block 14, the first Reset block 14 being electrically connected to the Reset terminal Reset, the first terminal of the memory block 11 and the second power terminal V2, respectively, and configured to Reset the voltage of the first terminal of the memory block 11 in response to a Reset signal input from the Reset terminal Reset; the touch detection part 2 further includes a second Reset module 24, and the second Reset module 24 is electrically connected to the Reset terminal Reset, the pixel driving part 1 and the touch signal sensing module, respectively, and configured to Reset a voltage of the touch signal sensing module in response to a Reset signal input by the Reset terminal Reset.
Further, as shown in fig. 7, the first Reset module 14 includes a fifth transistor T5, a gate of the fifth transistor T5 is electrically connected to the Reset terminal Reset, a first pole of the fifth transistor T5 is electrically connected to the second power terminal V2, and a second pole of the fifth transistor T5 is electrically connected to the first terminal of the memory module 11 and the gate of the fourth transistor T4, respectively; the second Reset block 24 includes a sixth transistor T6, a gate of the sixth transistor T6 is electrically connected to a Reset terminal Reset, a first pole of the sixth transistor T6 is electrically connected to the sensing electrode, and a second pole of the sixth transistor T6 is electrically connected to the first terminal of the memory block 11.
Specifically, as shown in fig. 7, the fifth transistor T5 is turned on when the Reset terminal Reset inputs a Reset signal, to turn on the first terminal of the storage capacitor C1 and the second power source terminal V2 to Reset the potential of the first terminal of the storage capacitor C1 to the potential of the second power source terminal V2, and the ninth transistor T9 is turned on when the Reset terminal Reset inputs a Reset signal, to turn on the first terminal of the sensing capacitor and the second power source terminal V2 to Reset the potential of the first terminal of the storage capacitor C1 to the potential of the second power source terminal V2.
In this embodiment, the first reset module 14 and the second reset module 24 are arranged to reset the voltages of the storage module 11 and the touch signal sensing module, so as to improve the stability and control accuracy of the circuit.
Based on the same inventive concept, an embodiment of the present application further provides a display panel, as shown in fig. 8, the display panel includes the pixel driving circuit in the above embodiment, and has the beneficial effects of the pixel driving circuit, which are not described herein again.
Specifically, as shown in fig. 8, the display panel provided by the present embodiment further includes a plurality of shift register units, the plurality of pixel driving circuits are arranged in pixel rows, and each pixel row corresponds to one shift register unit.
As shown in fig. 8, in an nth pixel row, each pixel driving circuit in an nth pixel row is electrically connected to the (n-1) th, nth and (n +1) th shift register units, respectively, where the shift signals input to the pixel driving circuit by the (n-1) th, nth and (n +1) th shift register units are respectively used as the reset signal, the first control signal and the second control signal of the pixel driving circuit.
Based on the same inventive concept, an embodiment of the present application further provides a display device, as shown in fig. 9, the display device includes the display panel in the above embodiment, and has the beneficial effects of the display panel, which are not described herein again.
Specifically, as shown in fig. 9, the display device provided in this embodiment further includes a driving chip and a power supply, where the driving chip provides a driving signal for the pixel driving circuit, and the power supply provides power for the driving circuit.
Based on the same inventive concept, an embodiment of the present application further provides a driving method for driving the pixel driving circuit in the foregoing embodiment, where the driving method provided in this embodiment includes:
in the Reset stage, the Reset terminal Reset receives the Reset signal, the pixel driving part 1 performs voltage Reset on the pixel driving part 1 in response to the Reset signal, and the touch detection part 2 performs voltage Reset on the touch detection part 2 in response to the Reset signal;
in the Data writing phase, the first control terminal CON1 receives the first control signal, the Data writing terminal Data receives the current Data signal, the pixel driving part 1 responds to the first control signal and the current Data signal to form a driving signal, and the touch detection part 2 maintains the current state;
in the lighting phase, the second control terminal CON2 receives a second control signal, and when the touch detection part 2 is in the touch state, the touch detection part 2 inputs a touch detection signal to the sensing signal line in response to the second control signal; the pixel driving section 1 drives the electroluminescence element 3 to emit light in accordance with the driving signal, and inputs an off signal to the pixel driving section 1 when the touch detection section 2 is in a touched state to cause the pixel driving section 1 to control the electroluminescence element 3 not to emit light.
The following describes each stage of the driving method provided in this embodiment in detail with reference to the pixel driving circuit shown in fig. 10 and the timing chart shown in fig. 11.
As shown in FIG. 10, the first power supply terminal V1 is an anode power supply terminal VDDThe second power supply terminal V2 is the cathode power supply terminal VSSAnd the transistors in the pixel driving circuit are all N-type transistors. Wherein the anode potential can also be expressed as VDDCathodic potentialCan also be expressed as VSS。
Referring to fig. 8 and 10, the Reset terminal Reset inputs the previous gate shift signal G (n-1), the first control terminal CON1 inputs the current gate driving signal G (n), and the second control terminal CON2 inputs the next gate shift signal G (n + 1).
(1) Reset phase t1
As shown in fig. 10 and 11, in the Reset period T1, the Reset terminal Reset inputs a high level, the fifth transistor T5 is turned on, wherein the fifth transistor T5 is turned on to pull down the potential of the first terminal of the storage capacitor C1 to VSSSince the gate of the third transistor T3 and the gate of the fourth transistor T4 are electrically connected to each other through the first end of the storage capacitor C1, the gate of the third transistor T3 and the gate of the fourth transistor T4 are both pulled down to VSSThat is, the reset of the voltage of the pixel driving section 1 is completed, and the reset initial voltage is VSS。
As shown in fig. 10 and 11, in the Reset period T1, the ninth transistor T9 is further turned on by the high level input from the Reset terminal Reset, so that the first terminal of the sensing electrode is electrically connected to the first terminal of the storage capacitor C1, and since the potential of the first terminal of the storage capacitor C1 is pulled down to VSS, the potential of the sensing electrode is also pulled down to VSSVSSSince the gates of the sixth and seventh transistors T6 and T7 are electrically connected to the sensing electrode, the gates of the sixth and seventh transistors T6 and T7 are also pulled down to VSSThat is, the voltage of the touch detection part 2 is reset, and the reset initial voltage is VSS。
(2) Data writing phase t2
As shown in fig. 10 and 11, in the Data writing period T2, the first control terminal CON1 inputs a high level, the first transistor T1 and the second transistor T2 are turned on, and the Data signal input from the Data writing terminal Data is the voltage Data signal VdataThe voltage data signal VdataConverted into current data signal I by voltage-to-current moduledataCurrent data signal IdataThe current flows through the second transistor T2 to charge the storage capacitor C1 until the potential of the first terminal of the storage capacitor C1 reachesThe source drain terminal current flowing through the third transistor T3 is IdataAt this time, the charging to the C1 is stopped, the gate of the fourth transistor T4 is connected to the gate of the third transistor T3, and the fourth transistor T4 is simultaneously turned on. The gate potential of the third transistor T3 is the driving signal. The driving of the electroluminescent element 3 is realized by using the data signal in the form of a current, so that the gate potential of the fourth transistor T4 as a driving transistor can be kept stable, i.e., the fourth transistor T4 is ensured to operate in the saturation region in the light-emitting period, without considering the influence of the threshold voltage Vth.
As shown in fig. 10 and 11, in the data writing period t2, the Reset terminal Reset and the second control terminal CON2 both input a low level, and each transistor in the touch detection portion 2 is in an off state, so that the sensing electrode maintains the current potential, i.e., the Reset potential V is maintainedSS。
(3) Luminous phase t3
As shown in fig. 10 and 11, in the light emitting period T3, since the gates of the fourth transistor T4 and the third transistor T3 are electrically connected, that is, the gates of the fourth transistor T4 and the third transistor T3 are at the same potential, the fourth transistor T4 is turned on, so that the electroluminescent element 3 emits light. Specifically, according to the current mirror principle, the current flowing through the fourth transistor T4, i.e., the driving current
Wherein
Wherein μ is the field effect mobility; cOXCapacitance per unit area of insulating layer, W3And L3Is the channel width and length, W, of the third transistor T34And L4Is the channel width and length of the fourth transistor T4. Since the third transistor T3 and the fourth transistor T4 are the same process, μ 3 and μ 4 are the same, COX3And COX4Are identical, i.e. that
Is a constant. Therefore, the third transistor T3 and the fourth transistor T can be set in advanceThe width-to-length ratio of the transistor T4 determines the ratio of the drive current to the current data signal, and preferably the width-to-length ratio of the fourth transistor T4 is greater than the width-to-length ratio of the third transistor to obtain a greater drive current.
The driving of the electroluminescent element 3 is realized by using the data signal in the form of a current, so that the gate potential of the fourth transistor T4 as a driving transistor can be kept stable, i.e., the fourth transistor T4 is ensured to operate in the saturation region in the light-emitting period, without considering the influence of the threshold voltage Vth.
As shown in fig. 10 and 11, in the light emitting period T3, the second control terminal CON2 inputs a high level to turn on the eighth transistor T8, and if the sensing electrode is in a touch state, and the potential of the sensing electrode is increased due to positive electricity of a human body, that is, the potential of the point d is increased, the increase of the potential of the point d can turn on the seventh transistor T7, so that the first power terminal V1 charges the sensing signal line, and the current on the sensing signal line is the touch detection signal; if the sensing electrode is in a non-touch state, the potential at the point d is low and the seventh transistor T7 cannot be turned on, and no signal is collected by the sensing signal line. Therefore, the detection of the touch signal can be realized. Meanwhile, if the sensing electrode is in a touch state at this time, the potential at the point d rises to turn on the sixth transistor T6, turn on the sixth transistor T6 to turn on the gate of the fourth transistor T4 and the second power supply terminal V2 to turn off the fourth transistor T4, so that the electroluminescent element 3 cannot emit light, and the purpose of saving electric energy is achieved; if the sensing electrode is in a non-touch state, the potential at the point d is low and the sixth transistor T6 cannot be turned on, so that the fourth transistor T4 still drives the electroluminescent element 3 normally, i.e., the area of the display device not covered by the finger can display normally.
The touch detection signal (i.e., the current on the sensing signal line) is transmitted to the touch chip through the amplifying circuit, the digital-to-analog converter, etc., and the touch chip processes the touch detection signal to realize the touch function.
By applying the embodiment of the application, at least the following beneficial effects can be realized:
the pixel driving circuit, the driving method thereof, the display panel and the display device provided by the embodiment of the application not only realize that the touch detection part can realize the collection of the touch detection signal by sharing the control signal of the pixel driving part, but also enable the pixel driving part to control the electroluminescent element not to emit light when the touch detection part is in a touch state, so that the pixels of the part of the display device touched by fingers (or other parts of a human body) do not emit light, thereby being beneficial to reducing the power consumption of the display device and saving electric energy.
Those of skill in the art will appreciate that the various operations, methods, steps in the processes, acts, or solutions discussed in this application can be interchanged, modified, combined, or eliminated. Further, other steps, measures, or schemes in various operations, methods, or flows that have been discussed in this application can be alternated, altered, rearranged, broken down, combined, or deleted. Further, steps, measures, schemes in the prior art having various operations, methods, procedures disclosed in the present application may also be alternated, modified, rearranged, decomposed, combined, or deleted.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
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, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
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; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (11)
1. A pixel driving circuit is characterized by comprising a pixel driving part, a touch detection part and an electroluminescent element;
the electroluminescent element is electrically connected with a first power supply terminal and the pixel driving part respectively;
the pixel driving part is respectively electrically connected with the touch detection part, the second power supply end, the first control end and the data writing end, is configured to respond to a first control signal input by the first control end and a data signal input by the data writing end to form a driving signal, and drives the electroluminescent element to emit light according to the driving signal;
the touch detection part is electrically connected with the first power terminal, the second control terminal and the sensing signal line, respectively, is configured to input a turn-off signal to the pixel driving part to make the pixel driving part control the electroluminescent element not to emit light when the touch detection part is in a touch state, and is configured to input a touch detection signal to the sensing signal line in response to a second control signal input from the second control terminal when the touch detection part is in the touch state.
2. The pixel driving circuit according to claim 1, wherein the pixel driving section includes a storage module, a data writing module, and a driving module,
the storage module comprises a first end and a second end, the first end is electrically connected with the data writing module and the driving module respectively, and the second end is electrically connected with the second power supply end;
the data writing module is respectively electrically connected with the first control end, the data writing end and the control end of the driving module, and is configured to respond to a first control signal received by the first control end, store a current data signal input by the data writing end into the storage module until the voltage of the first end of the storage module reaches a set voltage, and write the set voltage into the control end of the driving module;
the driving module is electrically connected to the electroluminescent element, the second power source terminal, and the touch detection part, and is configured to be turned on in response to the set voltage and drive the electroluminescent element to emit light according to the current data signal, and to be turned off in response to the turn-off signal so that the electroluminescent element does not emit light.
3. The pixel driving circuit according to claim 2, wherein the touch detection part comprises a touch signal sensing module, a touch signal detection module and a light emission control module;
the touch signal sensing module is respectively electrically connected with the second power end, the touch signal detection module and the light-emitting control module, and is configured to generate a sensing signal and send the sensing signal to the touch signal detection module and the light-emitting control module when the touch detection part is in a touch state;
the touch signal detection module is electrically connected with the second control terminal, the sensing signal line and the first power terminal respectively, and is configured to respond to the second control signal and the sensing signal, to conduct the sensing signal line and the first power terminal so that the first power terminal charges the sensing signal line, and to use a current on the sensing signal line as a touch detection signal;
the light emission control module is electrically connected to the pixel driving part and configured to input a turn-off signal to the pixel driving part in response to the sensing signal.
4. The pixel driving circuit according to claim 3, wherein the data writing module comprises a first transistor, a second transistor, and a third transistor, and the driving module comprises a fourth transistor;
a gate of the first transistor is electrically connected to the first control terminal, a first electrode of the first transistor is electrically connected to the data writing terminal, and a second electrode of the first transistor is electrically connected to a first electrode of the third transistor;
a gate of the second transistor is electrically connected to the first control terminal, a first electrode of the second transistor is electrically connected to the data writing terminal, and a second electrode of the second transistor is electrically connected to the first control terminal, a gate of the third transistor, a first terminal of the memory module, and a gate of the fourth transistor, respectively;
a second pole of the third transistor is electrically connected to the second power terminal;
a first electrode of the fourth transistor is electrically connected to the electroluminescent element, and a second electrode of the fourth transistor is electrically connected to the second power source terminal.
5. The pixel driving circuit according to claim 4, wherein the touch signal sensing module comprises a sensing electrode and a sensing capacitor, and the light emitting control module comprises a sixth transistor;
the induction capacitor is electrically connected with the second power supply end and the induction electrode respectively;
the sensing electrode is electrically connected with the grid electrode of the sixth transistor, the first electrode of the sixth transistor is electrically connected with the grid electrode of the fourth transistor, and the second electrode of the sixth transistor is electrically connected with the second power supply end.
6. The pixel driving circuit according to claim 5, wherein the touch signal detection module comprises a seventh transistor and an eighth transistor,
a gate of the seventh transistor is electrically connected to the sense electrode, a first electrode of the seventh transistor is electrically connected to a second electrode of the eighth transistor, and the second electrode of the seventh transistor is electrically connected to the first power supply terminal;
the grid electrode of the eighth transistor is electrically connected with the second control end, and the first electrode of the eighth transistor is electrically connected with the sensing signal line.
7. The pixel driving circuit according to any one of claims 3 to 6, wherein the pixel driving section and the touch detection section are further electrically connected to a reset terminal, respectively;
the pixel driving part further comprises a first reset module electrically connected to the reset terminal, the first terminal of the memory module and the second power terminal, respectively, and configured to reset a voltage of the first terminal of the memory module in response to a reset signal input from the reset terminal;
the touch detection part further comprises a second reset module, wherein the second reset module is respectively electrically connected with the reset terminal, the pixel driving part and the touch signal induction module and is configured to reset the voltage of the touch signal induction module in response to a reset signal input by the reset terminal.
8. The pixel driving circuit according to claim 7,
the first reset module comprises a fifth transistor, a grid electrode of the fifth transistor is electrically connected with the reset end, a first electrode of the fifth transistor is electrically connected with the second power supply end, and a second electrode of the fifth transistor is respectively electrically connected with the first end of the memory module and the grid electrode of the fourth transistor;
the second reset module comprises a sixth transistor, a grid electrode of the sixth transistor is electrically connected with the reset end, a first pole of the sixth transistor is electrically connected with the induction electrode, and a second pole of the sixth transistor is electrically connected with the first end of the storage module.
9. A display panel comprising the pixel drive circuit according to any one of claims 1 to 8.
10. A display device characterized by comprising the display panel according to claim 9.
11. A driving method for driving the pixel driving circuit according to any one of claims 1 to 8, the driving method comprising:
a reset phase, in which the reset terminal receives a reset signal, the pixel driving part performs voltage reset on the pixel driving part in response to the reset signal, and the touch detection part performs voltage reset on the touch detection part in response to the reset signal;
in the data writing stage, the first control end receives a first control signal, the data writing end receives a current data signal, the pixel driving part responds to the first control signal and the current data signal to form a driving signal, and the touch detection part maintains the current state;
in the lighting stage, the second control end receives a second control signal, and when the touch detection part is in a touch state, the touch detection part responds to the second control signal to input a touch detection signal to the induction signal line; the pixel driving part drives the electroluminescent element to emit light according to the driving signal, and inputs a disconnection signal to the pixel driving part when the touch detection part is in a touch state so that the pixel driving part controls the electroluminescent element not to emit light.
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