CN117174028A

CN117174028A - Pixel circuit and electronic equipment

Info

Publication number: CN117174028A
Application number: CN202311237290.7A
Authority: CN
Inventors: 赵小恒
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2023-09-22
Filing date: 2023-09-22
Publication date: 2023-12-05

Abstract

The application discloses a pixel circuit and an electronic device, wherein the pixel circuit comprises: the light-emitting device comprises a light-emitting element, a driving module, a first compensation module and a second compensation module; the light-emitting element is connected with the power supply module through the driving module; the driving module controls the light-emitting element to be turned on or turned off according to the first control signal; the first compensation module is connected with the driving module and is used for carrying out threshold voltage compensation on the driving module according to the second control signal; the first compensation module is also used for inputting a display control signal for controlling the pixel circuit to be in a display area or a non-display area; one end of the second compensation module is connected with the first electrode of the light-emitting element, and the other end of the second compensation module is connected with the first power supply and is positioned in a straight-through passage or a load passage according to the second control signal and the third control signal; when the pixel circuit is positioned in the display area, the light-emitting element is connected with a first power supply through a through passage; when the pixel circuit is in the non-display area, the light-emitting element is connected with the first power supply through a load path.

Description

Pixel circuit and electronic equipment

Technical Field

The present application relates to the field of electronic products, and in particular, to a pixel circuit and an electronic device.

Background

An Active Matrix Organic Light Emitting Diode (AMOLED) circuit, each pixel circuit including a plurality of thin film transistors (Thin Film Transistor, TFTs) driving switches and one Organic Light-Emitting Diode (OLED). In the prior art, a control signal (such as a pulse signal) is input to a TFT in a pixel circuit to realize display of the pixel circuit, but the current control mode of the pixel circuit has the problem of high initialization frequency of an OLED anode, so that the initialization degree of the OLED anode has differences in different time periods, and the problem of split screen of low brightness and low gray scale is caused.

Disclosure of Invention

The embodiment of the application provides a pixel circuit and electronic equipment, which are used for solving the problem that the existing pixel circuit is easy to split.

In order to solve the technical problems, the application is realized as follows:

in a first aspect, an embodiment of the present application provides a pixel circuit, including:

a light emitting element;

the light-emitting element is connected with the power supply module through the driving module; the driving module controls the light-emitting element to be turned on or turned off according to the input first control signal;

The first compensation module is connected with the driving module; the first compensation module is used for compensating the threshold voltage of the driving module according to the input second control signal; the first compensation module is further used for inputting a display control signal, and the display control signal is used for controlling the pixel circuit to be in a display area or a non-display area;

one end of the second compensation module is connected with the first electrode of the light-emitting element, and the other end of the second compensation module is connected with a first power supply; the second compensation module is used for being in a straight-through path or a load path according to the second control signal and the third control signal which are input; when the pixel circuit is positioned in a display area, the light-emitting element is connected with the first power supply through the through passage; when the pixel circuit is in a non-display area, the light-emitting element is connected with the first power supply through the load path.

In a second aspect, embodiments of the present application also provide an electronic device comprising a pixel circuit as described above.

In a third aspect, an embodiment of the present application further provides a method for controlling a pixel circuit, which is applied to an electronic device as described above, where the method includes:

Outputting the second control signal to the first compensation module and outputting the second control signal and the third control signal to the second compensation module in a first time period, controlling the first compensation module to perform threshold voltage compensation on the driving module, and simultaneously controlling the second compensation module to be in the through passage;

outputting the first control signal to the driving module in a second time period to control the light-emitting element to be turned on;

and in a third time period, outputting the second control signal to the first compensation module, outputting the second control signal and the third control signal to the second compensation module, controlling the first compensation module to compensate the threshold voltage of the driving module, and controlling the second compensation module to be positioned in the load path.

In a fourth aspect, an embodiment of the present application further provides a control device for a pixel circuit, which is applied to the electronic device described above, and the device includes:

the first control module is used for outputting the second control signal to the first compensation module and outputting the second control signal and the third control signal to the second compensation module in a first time period, controlling the first compensation module to compensate the threshold voltage of the driving module and controlling the second compensation module to be positioned in the straight-through passage;

The second control module is used for outputting the first control signal to the driving module in a second time period to control the light-emitting element to be turned on;

and the third control module is used for outputting the second control signal to the first compensation module and outputting the second control signal and the third control signal to the second compensation module in a third time period, controlling the first compensation module to compensate the threshold voltage of the driving module and controlling the second compensation module to be positioned in the load path.

In a fifth aspect, an embodiment of the present application provides an electronic device, including a processor, a memory, and a program or instructions stored on the memory and executable on the processor, the program or instructions implementing the steps of the method for controlling a pixel circuit according to the third aspect when executed by the processor.

In a sixth aspect, an embodiment of the present application provides a readable storage medium having stored thereon a program or instructions which, when executed by a processor, implement the steps of the method for controlling a pixel circuit according to the first aspect.

In a seventh aspect, an embodiment of the present application provides a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and the processor is configured to execute a program or instructions to implement the steps of the method for controlling a pixel circuit according to the first aspect.

In the above scheme of the application, when the first compensation module and the second compensation module are controlled by adopting the same second control signal, the second compensation module is further controlled to be positioned in a through passage or a load passage by a third control signal, and when the pixel circuit is positioned in a display area, the light-emitting element is connected with the first power supply through the through passage for initialization; when the pixel circuit is in a non-display area, the light-emitting element is connected with the first power supply through the load path for initialization. Therefore, when the pixel circuit is in a non-display area or a display area, the light-emitting elements can obtain consistent initialization degrees, and the phenomenon of split screen caused by inconsistent initialization degrees of the light-emitting elements in the pixel circuit is avoided.

Drawings

FIG. 1 is a schematic diagram showing a split-screen phenomenon of a pixel circuit;

FIG. 2 shows one of the timing diagrams of an EM signal;

FIG. 3 shows a second timing diagram of an EM signal;

FIG. 4 is a schematic diagram of a pixel circuit according to an embodiment of the application;

FIG. 5 shows one of timing diagrams of control signals of a pixel circuit according to an embodiment of the present application;

FIG. 6 is a second timing diagram of a control signal of a pixel circuit according to an embodiment of the application;

Fig. 7 is a flowchart of a control method of a pixel circuit according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a pixel circuit control device according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application;

fig. 10 shows a schematic hardware structure of an electronic device according to an embodiment of the present application.

Detailed Description

Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

The following description is made with respect to the related art of the pixel circuit:

a plurality of TFT driving switches and an OLED may be generally included in one pixel circuit. The OLED is composed of a PN junction like a common diode, a region with more electrons (negatively charged) is called an N region, a region with more holes (positively charged) is called a P region, and the N region and the P region form the PN junction. The PN junction has the characteristics of unidirectional conduction and reverse cut-off. When a forward voltage is applied to the light emitting diode, holes injected from the P region to the N region and electrons injected from the N region to the P region recombine with the electrons in the N region and the holes in the P region, respectively, in the vicinity of the PN junction, generating spontaneous emission fluorescence. The energy states of electrons and holes in different semiconductor materials are different. The more energy that is released when an electron and a hole recombine, the shorter the wavelength of the emitted light. Diodes that emit red, green or blue light are more commonly used.

Taking an 8T1C pixel circuit (i.e. the pixel circuit includes 8 TFT driving switches and an OLED) as an example, since the TFT switches for initializing the OLED anode and the TFT switches for compensating the main driving switch are controlled by the same signal, the frequency of initializing the OLED anode is too high, which causes the difference in the degree of initializing the OLED anode in different time periods, and thus causes the problem of splitting a low-brightness, low-gray-scale scene.

For the above 8T1C pixel circuit, a schematic diagram of the scan driving of the OLED switching signal (EM) for two consecutive frames (e.g., the nth frame and the n+1th frame) is given, as shown in fig. 1. Timing diagrams of the corresponding EM pulse signals are shown in fig. 2 and 3. In fig. 1, the small black filled represents EM pulses, the Active section indicates that the pixel circuit is in the display area, the timing of the EM pulses is the timing 111 of the EM (1) moment, the EM pulses 113 indicate that there are three EM pulses in the Active section, and the EM pulses 114 indicate that there are two EM pulses in the Active section; the Porch section indicates that the pixel circuit is in the non-display region, and the timing of the EM pulse is the timing 112 of the EM (end) time. When one EM pulse enters a non-display area of the pixel circuit in one frame, only 2 EM pulses are actually driven in the pixel circuit; when the OLED anode is reset, the load of a power supply connected with the anode is reduced by 1/3, so that the OLED initialization degree is more sufficient than that of other time periods, the phenomenon of darkness and uneven is displayed, and split screen appears.

As shown in fig. 4, an embodiment of the present application provides a pixel circuit, including:

a light emitting element 1;

a driving module 2, wherein the light-emitting element 1 is connected with a power supply module through the driving module 2; the driving module 2 controls the light-emitting element 1 to be turned on or off according to the input first control signal;

a first compensation module 3, wherein the first compensation module 3 is connected with the driving module 2; the first compensation module 3 is configured to perform threshold voltage compensation on the driving module 2 according to an input second control signal; the first compensation module 3 is further configured to input a display control signal, where the display control signal is used to control the pixel circuit to be in a display area or a non-display area;

a second compensation module 4, wherein one end of the second compensation module 4 is connected with the first electrode of the light-emitting element 1, and the other end is connected with a first power vint 2; the second compensation module 4 is configured to be in a through path or a load path according to the second control signal and the third control signal; wherein, when the pixel circuit is in the display area, the light emitting element 1 is connected with the first power supply through the through passage; when the pixel circuit is in a non-display area, the light emitting element 1 is connected to the first power supply through the load path.

Alternatively, the light emitting element 1 may be a light emitting diode. For example: in case the light emitting element 1 is a light emitting diode, the first electrode of the light emitting element 1 may be an anode of the light emitting diode. Alternatively, the first power source vint2 may be used to provide an initialization potential of the light emitting element 1, for example: in case the light emitting element 1 selects a light emitting diode, the first power source vint2 may be used to provide an anode initialization potential of the light emitting diode.

Optionally, the power supply module is configured to supply power to the pixel circuit, for example: the driving module 2 is connected with the power supply module, so that the power supply module can supply power for devices in the driving module 2; or the first compensation module 3 may also be connected to the power supply module, so that the power supply module may provide electric energy for the first compensation module 3, and the embodiment of the application is not limited thereto.

Optionally, the first control signal may be a pulse signal, and the first control signal may be generated by the processor and then transmitted to the driving module 2 in the pixel circuit, so that the driving module 2 may control the light emitting element 1 to be turned on or turned off under the action of the first control signal, so that the display screen formed by the pixel circuit may implement a display function under the control of the processor.

Alternatively, the second control signal may be a pulse signal, and the second control signal may be generated by the processor and then transmitted to the first compensation module 3 in the pixel circuit, so that the first compensation module 3 may perform threshold voltage compensation on the driving module 2 (that is, compensate for the threshold voltage (Vth) of the TFT tube in the driving module 2) under the action of the second control signal. The display control signal may also be referred to as a DATA signal (DATA), i.e. display intelligence DATA.

Alternatively, the third control signal may be a pulse signal, and the third signal may be generated by the processor and then transmitted to the second compensation module 4 in the pixel circuit, so that the second compensation module 4 may initialize the light emitting element 1 under the action of the second control signal and the third control signal.

Alternatively, the through path, i.e. the no-load path, that is to say the first power supply vint2 is connected to the light-emitting element 1 without being subjected to a load, providing the light-emitting element 1 with an initialization potential. The load path, that is, the first power vint2 is connected to the light emitting element 1 when the load is applied, and supplies an initialization potential to the light emitting element 1.

In the embodiment of the present application, when the first compensation module 3 and the second compensation module 4 are controlled by the same second control signal, the second compensation module 4 is further controlled to be in a through path or a load path by a third control signal, and when the pixel circuit is in a display area, the light emitting element 1 is initialized by being connected to the first power vint2 through the through path; when the pixel circuit is in a non-display area, the light emitting element 1 is connected to the first power supply through the load path to be initialized. Therefore, when the pixel circuit is in a non-display area or a display area, the light-emitting element 1 can obtain consistent initialization degree, and the phenomenon of split screen caused by inconsistent initialization degree of the light-emitting element 1 in the pixel circuit is avoided.

Optionally, the second compensation module 4 includes: a switching unit and a load element R;

the first electrode of the light-emitting element 1 is connected with a first power vint2 through the switch unit and a load element R;

wherein, the switch unit controls the second compensation module 4 to be in the through passage when the first electrode of the light emitting element 1 is directly connected with the first power supply according to the second control signal and the third control signal; the switching unit controls the second compensation module 4 to be in the load path when the first electrode of the light emitting element 1 is conducted with the first power supply through the load element R according to the second control signal and the third control signal. In this embodiment, the switching unit is configured to control whether the load element R is connected to a path between the first electrode of the light emitting element 1 and the first power source vint2, for example: the switching unit controls the load element R to be connected to a path between the first electrode of the light-emitting element 1 and the first power vint2 under the action of the second control signal and the third control signal, namely, the second compensation module 4 is positioned in the load path; the switching unit controls the load element R not to be connected to the path between the first electrode of the light emitting element 1 and the first power vint2 under the action of the second control signal and the third control signal, that is, the second compensation module 4 is in the through path.

Optionally, the switching unit includes: a first switch T7 and a second switch T9; the first end of the first switch T7 is connected to the first end of the second switch T9 and the first end of the load element R, the second end of the first switch T7 is connected to the first electrode of the light emitting element 1, and the second end of the second switch T9 and the second end of the load element R are connected to the first power vint 2; the control end of the first switch T7 is used for inputting the second control signal, and the control end of the second switch T9 is used for inputting the third control signal.

As shown in fig. 4, the second control signal input at the control end of the first switch T7 is the control signal Pscan1 in fig. 4, and is used for controlling the first switch T7 to be turned on or off; the third control signal input by the control end of the second switch T9 is the control signal Pscan3 in fig. 4, and is used for controlling the second switch T9 to be turned on or off.

Alternatively, the first switch T7 and the second switch T9 may be selected from a TFT, or may also be selected from other switching transistors, which is not limited in the embodiment of the present application.

Wherein, the first switch T7 is in a conducting state under the action of the second control signal, and the second compensation module 4 is in the through passage when the second switch T9 is in a conducting state under the action of the third control signal; the first switch T7 is in an on state under the action of the second control signal, and the second switch T9 is in an off state under the action of the third control signal, so that the second compensation module 4 is in the load path.

In this embodiment, by setting the first switch T7 and the second switch T9 in the switch unit, when the pixel circuit is in the display area, the first switch T7 may use the same control signal as the first compensation module to initialize the light emitting element 1; when the pixel circuit is in the non-display area, a load is introduced into the initialization path of the light emitting element 1 by controlling the second switch T9, so that when the pixel circuit is in the non-display area or the display area, the light emitting element 1 can obtain consistent initialization degree, and the split screen phenomenon caused by inconsistent initialization degree of the light emitting element 1 in the pixel circuit is avoided.

Alternatively, the load element R may be a resistor. Specific resistance parameter settings may be set according to specific pixel circuits, initialization voltages, and the like, and embodiments of the present application are not limited in detail.

Optionally, the driving module 2 includes: a main drive switch T1, a positive power switch T5 and a negative power switch T6; the first end of the positive power switch T5 is connected with the power supply module, the second end of the positive power switch T5 is connected with the first end of the main driving switch T1, the second end of the main driving switch T1 is connected with the first end of the negative power switch T6, the second end of the negative power switch T6 is connected with the first electrode of the light-emitting element 1, and the second electrode of the light-emitting element 1 is connected with the power supply module;

The control ends of the positive power switch T5 and the negative power switch T6 are respectively input with the first control signal; the control end of the main driving switch T1 is connected with the first compensation module 3.

For example: in the case where the light emitting element 1 is a light emitting diode, the first electrode of the light emitting element 1 is an anode of the light emitting diode, and the second electrode of the light emitting element 1 is a cathode of the light emitting diode. That is, the second end of the negative power switch T6 is connected to the anode of the light emitting diode, and the cathode of the light emitting diode is connected to the power supply module.

Alternatively, the main driving switch T1, the positive power switch T5, and the negative power switch T6 may be selected from TFT transistors, or may be selected from other switching transistors, etc., which is not limited in the embodiment of the present application.

As shown in fig. 4, the first control signals input by the control terminals of the positive power switch T5 and the negative power switch T6 are the control signals EM in fig. 4, for controlling the light emitting element 1 to be turned on or off.

In this embodiment, the first control signal is a pulse signal, and is used to control the on and off of the positive power switch T5 and the negative power switch T6, for example, when the first control signal controls the positive power switch T5 and the negative power switch T6 to be in the on state, the light emitting element 1 is turned on, i.e. emits light; for example, the first control signal controls the positive power switch T5 and the negative power switch T6 to be in the off state, and the light emitting element 1 is turned off.

Optionally, the power supply module includes: a positive electrode power source ELVDD and a negative electrode power source ELVSS; the first terminal of the positive power switch T5 is connected to the positive power ELVDD, and the second electrode of the light emitting element 1 is connected to the negative power ELVSS.

For example: in the case where the light emitting element 1 selects a light emitting diode, a cathode of the light emitting diode is connected to the negative electrode power source ELVSS.

Optionally, the first compensation module 3 includes: a voltage storage unit 31 and a third switch T8; the voltage storage unit 31 is connected to the first end, the second end and the control end of the main driving switch T1, respectively, and the voltage storage unit 31 is configured to input the display control signal and generate a first voltage difference;

the first end of the third switch T8 is connected with the second power supply Vint3, the second end of the third switch T8 is connected with the first end of the main driving switch T1, and the control end of the third switch T8 is used for inputting the second control signal; when the third switch T8 is in a conducting state under the action of the second control signal, the second power Vint3 compensates the first voltage difference.

As shown in fig. 4, the display control signal input by the voltage storage unit 31 is the signal DATA in fig. 4, and is used for displaying information DATA; the second control signal input by the control end of the third switch T8 is the control signal Pscan1 in fig. 4, and is used for controlling the third switch T8 to be turned on or off.

Alternatively, the third switch T8 may be a TFT, or may also be another switch transistor, etc., which is not limited in this embodiment of the present application.

In this embodiment, the first compensation module 3 is used for threshold voltage compensation of the driving module 2, that is, the first compensation module 3 is used for compensating the threshold voltage of the main driving switch T1 in the driving module 2. Specifically, the voltage storage unit 31 is configured to store a voltage and generate a first voltage difference (for example, the first voltage difference is a difference between a voltage value of the display control signal and a threshold voltage of the main driving switch T1). The second power Vint3 is used to compensate for the threshold voltage of the main driving switch T1 (i.e., to compensate for the first voltage difference).

Optionally, the voltage storage unit 31 includes: an initialization subunit, a fourth switch T3 and a fifth switch T2;

the initialization subunit is respectively connected with the power supply module, a third power supply Vint1 and a control end of the main driving switch T1, and is also connected with a second end of the main driving switch T1 through the fourth switch T3; a first end of the fifth switch T2 is connected to the first end of the main driving switch T1;

The initialization subunit is configured to initialize a voltage at a control end of the main driving switch T1 according to an input fourth control signal, where the main driving switch T1 is in a conductive state; the second end of the fifth switch T2 inputs the display control signal, and generates the first voltage difference when the fourth switch T3 and the fifth switch T2 are in a conductive state;

the first voltage difference is a difference between a voltage value of the display control signal and a threshold voltage of the main driving switch T1.

As shown in fig. 4, the control terminal of the fourth switch T3 may input a control signal Nscan 1 for controlling the fourth switch T3 to be turned on or off; the control end of the fifth switch T2 may further input a control signal Pscan 2 for controlling on or off of the fifth switch T2; the fourth control signal input by the initialization subunit is the control signal Nscan 2 in fig. 3. Alternatively, the control signals Nscan 1 and Nscan 2 may be pulse signals.

In this embodiment, the initialization subunit may obtain and store electric energy from the power supply module, and when the specific fourth switch T3 is turned on under the action of the control signal Nscan 1, the initialization subunit is turned on with the third power source Vint1, and at this time, the voltage of the control end of the main driving switch T1 is the output voltage value of the third power source Vint1 (that is, the voltage of the control end of the main driving switch T1 is initialized, that is, the initialization of the initialization subunit is implemented), where the main driving switch T1 is in an on state. Further, when the fourth switch T3 and the fifth switch T2 are in an on state, the first terminal and the second terminal of the main driving switch T1 are shorted (if the main driving switch T1 is a TFT tube, this corresponds to source and gate shorting), until the potential of the control terminal of the main driving switch T1 reaches the first voltage difference, so as to generate the first voltage difference.

Optionally, the initializing subunit includes: an energy storage element C and a sixth switch T4;

the first end of the energy storage element C is connected with the power supply module, the second end of the energy storage element C is connected with the first end of the sixth switch T4, and the second end of the sixth switch T4 is connected with the third power supply Vint 1; the control end of the sixth switch T4 is used for inputting the fourth control signal;

when the sixth switch T4 is in a conducting state under the action of the fourth control signal, the control end of the main driving switch T1 is initialized, and the initialization voltage is the output voltage of the third power source Vint 1.

As further shown in fig. 4, the fourth control signal input at the control terminal of the sixth switch T4, that is, the control signal Nscan 2 in fig. 4, is used to control the on or off of the sixth switch T4.

In this embodiment, the first end of the energy storage element C may be connected to the positive power ELVDD in the power supply module. The energy storage element C may obtain and store electrical energy from the power supply module. When the specific fourth switch T3 is turned on under the action of the control signal Nscan 1, the energy storage element C is turned on with the third power source Vint1, at this time, the voltage at the control end of the main driving switch T1 is the output voltage value of the third power source Vint1 (that is, the voltage at the control end of the main driving switch T1 is initialized, that is, the initialization of the energy storage element C is implemented), and the main driving switch T1 is in a turned-on state.

The following describes the operation procedure of the pixel circuit according to the embodiment of the present application with reference to the timing chart of the control signals of the switches:

taking 3 EM pulses as an example, when one EM pulse enters the Porch interval, the second switch T9 is turned off, and the pixel circuit is connected to the load element R (such as a resistor), so as to compensate for the condition that the load of the first power Vint2 decreases, so that the anode initialization degrees of the Porch interval and the Active interval are consistent, as shown in fig. 5:

the first step: the timing of the control signals for each switch is timing 101;

at this time, the sixth switch T4 is turned on, the potential at the point a is the output voltage of the third power source Vint1, and the energy storage element C (such as a capacitor) is charged, so as to initialize the energy storage element C (that is, initialize the voltage at the control end of the main driving switch T1), that is, after the first step is completed, the potential at the point a is the output voltage of the third power source Vint 1.

And a second step of: the timing of the control signals for each switch is timing 102;

at this time, the fifth switch T2 and the fourth switch T3 are turned on. The source gate of the main driving switch T1 is in short circuit, the potential at the point A is larger than |Vth|, namely, the main driving switch T1 and the fourth switch T3 form a diode, the main driving switch T1 is turned on until the potential at the point A becomes Vdata- |Vth| and then is turned off, and the voltage difference (namely, the first voltage difference) of Vdata- |Vth| is stored, so that preparation is made for the subsequent voltage compensation of the main driving switch T1.

And a third step of: the timing of the control signals for each switch is timing 103;

at this time, the first switch T7, the third switch T8, and the second switch T9 are turned on;

when the first switch T7 is turned on, the anode of the light emitting element (i.e., OLED) is connected to the first power source Vint2, the cathode is connected to the negative power source ELVSS, a path is formed between the anode and the cathode of the light emitting element (i.e., OLED), the anode of the light emitting element (i.e., OLED) is initialized, the point a potential is Vdata-vth|, and the anode potential of the light emitting element (i.e., OLED) is the voltage of the first power source Vint 2;

when the third switch T8 is turned on, the source electrode of the main driving switch T1 is connected with the second power supply Vint3 to perform bias compensation on the main driving switch T1;

when the second switch T9 is turned on, the load element R (such as a resistor) is not connected in series to the pixel circuit.

Fourth step: the timing of the control signals for each switch is timing 105;

at this time, the positive power switch T5 and the negative power switch T6 are turned on, and the current ids= (1/2) K [ ELVDD- (Vdata-vth|) vth| -vth|passing through the main driving switch T1] ² ＝(1/2)K*(Vdd-Vdata) ² Where k=cox×μ×w/L (μ is surface mobility, which is a parameter of silicon material, cox is gate capacitance per unit area, which is a parameter of process, W, L is channel width and length, respectively, which is a physical parameter), current flows through the light emitting element (i.e., OLED), and the OLED starts to emit light, maintaining one frame.

Fifth step: the timing of the control signals for each switch is timing 106;

at this time, the positive power switch T5 and the negative power switch T6 are turned off, and the first switch T7, the third switch T8, and the second switch T9 are turned on, so that the third step of operation (repeated 2 times) is performed.

Sixth step: the timing of the control signal for each switch is timing 111;

at this time, the positive power switch T5, the negative power switch T6, and the second switch T9 are turned off, the first switch T7, and the third switch T8 are turned on, and the load element R (such as a resistor) is connected in series to the pixel circuit, so as to compensate the load of the first power vint 2.

When no EM pulse enters the Porch interval, the second switch T9 is turned on, the pixel circuit is not connected to the load element R (such as a resistor), and the anode reset is normally performed, as shown in fig. 6:

at this time, the sixth switch T4 is turned on, the potential at the point a is the voltage of the third power source Vint1, and the energy storage element C (such as a capacitor) is charged, so as to initialize the energy storage element C (such as a capacitor), that is, the potential at the point a is the voltage of the third power source Vint1 after the first step is completed.

at this time T2, T3 are open. The source gate of T1 is short-circuited, the potential of the point A is larger than |Vth|, namely, at the moment, a T1+T3 tube is assembled into an element, T1 is opened until the potential of the point A becomes Vdata- |Vth| and then is cut off, so that the voltage difference of Vdata- |Vth| is stored, and preparation is made for subsequent T1 voltage compensation.

when the third switch T8 is opened, the source stage of the T1 is connected with the second power supply Vint3 to carry out bias compensation on the T1;

Fourth step: the timing of the control signals for each switch is timing 105;

at this time, the positive power switch T5 and the negative power switch T6 are turned on, and the current ids= (1/2) K [ ELVDD- (Vdata-vth|) vth| -vth|passing through the main driving switch T1] ² ＝(1/2)K*(Vdd-Vdata) ² Where k=cox μ W/L (μ is surface mobility, is a silicon material parameter; cox is gate capacitance per unit area, is a process parameter; W, L are respectivelyChannel width and length, which are physical parameters), current flows through the light emitting element (i.e., OLED), which begins to emit light for one frame.

Fifth step: the timing of the control signals for each switch is timing 106;

It should be noted that, in fig. 4 and 5, the timing 104 represents the off time of the first EM pulse of the data access frame, and the first, second and third steps are performed. Timing 107 represents the frame synchronization signal of the nth frame. Timing 108 indicates that the control signal Pscan3 controls the second switch T9 to close and the load element R (e.g., resistor) compensates. Timing 109 represents an Active interval. Timing 110 represents a Porch interval. The sequence 111 represents a second EM pulse and a third EM pulse, and the first, second, and third steps described above are repeated.

According to the scheme, the second switch T9 and the load element R (such as a resistor) are arranged in the anode initialization path of the light-emitting element (namely the OLED), so that the anode reset degree of the light-emitting element (namely the OLED) in the Porch interval and the Active interval of the pixel circuit is consistent, the load change of the first power supply Vint2 of the pixel circuit in different stages is avoided, and the split screen problem is solved. And considering the difference between the pixel circuit driving schemes of different electronic devices, which may lead to the situation that the number of EM pulses and the width of Port are different, the scheme of the application can solve the problem of split screen without increasing additional circuit output, such as independent output control through a driving chip, and without affecting the product frame and the display area.

The embodiment of the application also provides electronic equipment, which comprises the pixel circuit, can realize all the embodiments of the pixel circuit and can achieve the same technical effects, and is not repeated here for avoiding repetition.

As shown in fig. 7, the embodiment of the application further provides a control method of the pixel circuit, which is applied to the electronic device, wherein the electronic device comprises the pixel circuit.

The method comprises the following steps:

step 71: and in a first time period, outputting the second control signal to the first compensation module, outputting the second control signal and the third control signal to the second compensation module, controlling the first compensation module to compensate the threshold voltage of the driving module, and controlling the second compensation module to be in the through passage.

In this embodiment, during the first period, the first compensation module is controlled by the second control signal to compensate the threshold voltage of the driving module, and the second compensation module is controlled by the second control signal and the third control signal to initialize the light emitting element (i.e. initialize the light emitting element without switching in a load), for example, the light emitting element is a light emitting diode, i.e. initialize the anode of the light emitting diode, by using the through path. See, in particular, timing 101 through timing 103 in fig. 5 described above.

Step 72: and in a second time period, outputting the first control signal to the driving module to control the light-emitting element to be turned on.

In this embodiment, the second period of time is located after the first period of time, i.e. after the initialization of the light emitting element and the compensation of the threshold voltage of the driving module are completed, the light emitting element may be controlled to be turned on. Referring specifically to timing 105 of fig. 5, the oled starts to emit light for one frame.

Step 73: and in a third time period, outputting the second control signal to the first compensation module, outputting the second control signal and the third control signal to the second compensation module, controlling the first compensation module to compensate the threshold voltage of the driving module, and controlling the second compensation module to be positioned in the load path.

In this embodiment, the third period is located after the second period, that is, the third period is used to continue the threshold voltage compensation for the driving module and to initialize the light emitting element at the same time. Specifically, the first compensation module is controlled by the second control signal to compensate the threshold voltage of the driving module in the third time period, and the second compensation module is controlled by the second control signal and the third control signal to be in a load path to initialize the light emitting element (i.e. initialize the light emitting element when the load is connected), for example, the light emitting element is a light emitting diode, i.e. initialize the anode of the light emitting diode). See in particular timing 111 in fig. 5.

In the above scheme, in a first period of time, the first compensation module is controlled by the second control signal to perform threshold voltage compensation on the driving module, and the second compensation module is controlled by the second control signal and the third control signal to initialize the light-emitting element by using the through channel; controlling the light-emitting element to be turned on in a second time period, namely after the initialization of the light-emitting element and the compensation of the threshold voltage of the driving module are completed; and in a third time period, controlling the first compensation module to compensate the threshold voltage of the driving module through a second control signal, and controlling the second compensation module to be in a load path through the second control signal and the third control signal to initialize the light-emitting element. Therefore, the light-emitting elements in the pixel circuit can always obtain consistent initialization degrees, and the phenomenon of split screen caused by inconsistent initialization degrees of the light-emitting elements in the pixel circuit is avoided.

Optionally, the first period and the second period are periods in which the pixel circuit is in a display region.

Optionally, the third period is a period in which the pixel circuit is in a non-display area, and the first control signal controls the light emitting element to be turned on.

In this embodiment, when the pixel circuit is in the display area, the first compensation module is controlled by the second control signal to perform threshold voltage compensation on the driving module, and the second compensation module is controlled by the second control signal and the third control signal to initialize the light emitting element by using the through channel; and when the pixel circuit is in a non-display area, controlling the first compensation module to compensate the threshold voltage of the driving module through a second control signal, and controlling the second compensation module to be in a load path through the second control signal and the third control signal to initialize the light-emitting element. Therefore, when the pixel circuit is in the display area and the non-display area, the light-emitting elements can always obtain consistent initialization degrees, and the phenomenon of split screen caused by inconsistent initialization degrees of the light-emitting elements in the pixel circuit is avoided.

According to the pixel circuit control method provided by the embodiment of the application, the execution main body can be the pixel circuit control device. In the embodiment of the present application, a control method for executing a pixel circuit by a control device for a pixel circuit is taken as an example, and the control device for a pixel circuit provided in the embodiment of the present application is described.

As shown in fig. 8, an embodiment of the present application provides a control device 800 of a pixel circuit, which is applied to an electronic apparatus as described above, the device 800 includes:

a first control module 810, configured to output the second control signal to the first compensation module and output the second control signal and the third control signal to the second compensation module in a first period of time, control the first compensation module to perform threshold voltage compensation on the driving module, and control the second compensation module to be in the through path at the same time;

the second control module 820 is configured to output the first control signal to the driving module during a second period of time, and control the light emitting element to be turned on;

and a third control module 830, configured to output the second control signal to the first compensation module, and output the second control signal and the third control signal to the second compensation module in a third period of time, control the first compensation module to perform threshold voltage compensation on the driving module, and control the second compensation module to be in the load path.

In the device provided by the embodiment of the application, in a first time period, a first compensation module is controlled by a second control signal to compensate the threshold voltage of a driving module, and a through passage is used for initializing a light-emitting element by controlling the second compensation module by the second control signal and the third control signal; controlling the light-emitting element to be turned on in a second time period, namely after the initialization of the light-emitting element and the compensation of the threshold voltage of the driving module are completed; and in a third time period, controlling the first compensation module to compensate the threshold voltage of the driving module through a second control signal, and controlling the second compensation module to be in a load path through the second control signal and the third control signal to initialize the light-emitting element. Therefore, the light-emitting elements in the pixel circuit can always obtain consistent initialization degrees, and the phenomenon of split screen caused by inconsistent initialization degrees of the light-emitting elements in the pixel circuit is avoided.

The audio data processing device in the embodiment of the application can be an electronic device or a component in the electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal, or may be other devices than a terminal. By way of example, the electronic device may be a mobile phone, tablet computer, notebook computer, palm computer, vehicle-mounted electronic device, mobile internet appliance (Mobile Internet Device, MID), augmented reality (augmented reality, AR)/Virtual Reality (VR) device, robot, wearable device, ultra-mobile personal computer, UMPC, netbook or personal digital assistant (personal digital assistant, PDA), etc., but may also be a server, network attached storage (Network Attached Storage, NAS), personal computer (personal computer, PC), television (TV), teller machine or self-service machine, etc., and the embodiments of the present application are not limited in particular.

The audio data processing device in the embodiment of the present application may be a device having an operating system. The operating system may be an Android operating system, an IOS operating system, or other possible operating systems, and the embodiment of the present application is not limited specifically.

The audio data processing device provided in the embodiment of the present application can implement each process implemented by the method embodiment of fig. 7, and in order to avoid repetition, a description thereof will not be repeated here.

Optionally, as shown in fig. 9, the embodiment of the present application further provides an electronic device 900, which includes a processor 901 and a memory 902, where a program or an instruction that can be executed on the processor 901 is stored in the memory 902, and the program or the instruction when executed by the processor 901 implements each step of the above-mentioned embodiment of the audio data processing method, and the steps can achieve the same technical effect, so that repetition is avoided, and no further description is given here.

The electronic device in the embodiment of the application includes the mobile electronic device and the non-mobile electronic device.

Fig. 10 is a schematic diagram of a hardware structure of an electronic device implementing an embodiment of the present application.

The electronic device 1000 includes, but is not limited to: radio frequency unit 1001, network module 1002, audio output unit 1003, input unit 1004, sensor 1005, display unit 1006, user input unit 1007, interface unit 1008, memory 09, and processor 1010.

Those skilled in the art will appreciate that the electronic device 1000 may also include a power source (e.g., a battery) for powering the various components, which may be logically connected to the processor 1010 by a power management system to perform functions such as managing charge, discharge, and power consumption by the power management system. The electronic device structure shown in fig. 10 does not constitute a limitation of the electronic device, and the electronic device may include more or less components than shown, or may combine certain components, or may be arranged in different components, which are not described in detail herein.

Wherein the processor 1010 is configured to: outputting the second control signal to the first compensation module and outputting the second control signal and the third control signal to the second compensation module in a first time period, controlling the first compensation module to perform threshold voltage compensation on the driving module, and simultaneously controlling the second compensation module to be in the through passage;

In the electronic device provided by the embodiment of the application, in a first time period, the first compensation module is controlled by the second control signal to compensate the threshold voltage of the driving module, and the second compensation module is controlled by the second control signal and the third control signal to initialize the light-emitting element by using the through passage; controlling the light-emitting element to be turned on in a second time period, namely after the initialization of the light-emitting element and the compensation of the threshold voltage of the driving module are completed; and in a third time period, controlling the first compensation module to compensate the threshold voltage of the driving module through a second control signal, and controlling the second compensation module to be in a load path through the second control signal and the third control signal to initialize the light-emitting element. Therefore, the light-emitting elements in the pixel circuit can always obtain consistent initialization degrees, and the phenomenon of split screen caused by inconsistent initialization degrees of the light-emitting elements in the pixel circuit is avoided.

It should be appreciated that in an embodiment of the present application, the input unit 1004 may include a graphics processor (Graphics Processing Unit, GPU) 10041 and a microphone 10042, and the graphics processor 10041 processes image data of still pictures or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The display unit 1006 may include a display panel 10061, and the display panel 10061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 1007 includes at least one of a touch panel 10071 and other input devices 10072. The touch panel 10071 is also referred to as a touch screen. The touch panel 10071 can include two portions, a touch detection device and a touch controller. Other input devices 10072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and so forth, which are not described in detail herein.

The memory 1009 may be used to store software programs as well as various data. The memory 1009 may mainly include a first memory area storing programs or instructions and a second memory area storing data, wherein the first memory area may store an operating system, application programs or instructions (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like. Further, the memory 1009 may include volatile memory or nonvolatile memory, or the memory 1009 may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM), static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (ddr SDRAM), enhanced SDRAM (Enhanced SDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DRRAM). Memory 1009 in embodiments of the application includes, but is not limited to, these and any other suitable types of memory.

The processor 1010 may include one or more processing units; optionally, the processor 1010 integrates an application processor that primarily processes operations involving an operating system, user interface, application programs, and the like, and a modem processor that primarily processes wireless communication signals, such as a baseband processor. It will be appreciated that the modem processor described above may not be integrated into the processor 1010.

The embodiment of the application also provides a readable storage medium, on which a program or an instruction is stored, which when executed by a processor, implements each process of the above-mentioned embodiment of the audio data processing method, and can achieve the same technical effects, so that repetition is avoided, and no further description is given here.

Wherein the processor is a processor in the electronic device described in the above embodiment. The readable storage medium includes computer readable storage medium such as computer readable memory ROM, random access memory RAM, magnetic or optical disk, etc.

The embodiment of the application further provides a chip, the chip comprises a processor and a communication interface, the communication interface is coupled with the processor, the processor is used for running programs or instructions, the processes of the control method embodiment of the pixel circuit can be realized, the same technical effects can be achieved, and the repetition is avoided, and the description is omitted here.

It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, chip systems, or system-on-chip chips, etc.

Embodiments of the present application provide a computer program product stored in a storage medium, which is executed by at least one processor to implement the respective processes of the control method embodiments of the pixel circuit described above, and achieve the same technical effects, and are not described herein in detail for avoiding repetition. In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.

While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the application.

Finally, it is further noted that relational terms such as first and second, and the like are 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. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.

While the foregoing is directed to the preferred embodiments of the present application, it will be appreciated by those skilled in the art that various modifications and changes can be made without departing from the principles of the present application, and such modifications and changes are intended to be within the scope of the present application.

Claims

1. A pixel circuit, comprising:

a light emitting element;

2. The pixel circuit of claim 1, wherein the second compensation module comprises: a switching unit and a load element;

the first electrode of the light-emitting element is connected with the first power supply through the switch unit and the load element;

the switch unit controls the first electrode of the light-emitting element to be directly connected with the first power supply according to the second control signal and the third control signal, and the second compensation module is positioned in the through passage;

the switch unit controls the first electrode of the light-emitting element to be in the load path when the first electrode of the light-emitting element is conducted with the first power supply through the load element according to the second control signal and the third control signal.

3. The pixel circuit according to claim 2, wherein the switching unit includes: a first switch and a second switch;

the first end of the first switch is connected with the first end of the second switch and the first end of the load element respectively, the second end of the first switch is connected with the first electrode of the light-emitting element, and the second end of the second switch and the second end of the load element are connected with the first power supply; the control end of the first switch is used for inputting the second control signal, and the control end of the second switch is used for inputting the third control signal;

The first switch is in a conducting state under the action of the second control signal, and the second compensation module is in the direct-connection passage when the second switch is in a conducting state under the action of the third control signal; the first switch is in an on state under the action of the second control signal, and the second compensation module is in the load path when the second switch is in an off state under the action of the third control signal.

4. A pixel circuit according to claim 2 or 3, wherein the load element is a resistor.

5. The pixel circuit of claim 1, wherein the driving module comprises: a main drive switch, an anode power switch and a cathode power switch;

the first end of the positive power switch is connected with the power supply module, the second end of the positive power switch is connected with the first end of the main driving switch, the second end of the main driving switch is connected with the first end of the negative power switch, the second end of the negative power switch is connected with the first electrode of the light-emitting element, and the second electrode of the light-emitting element is connected with the power supply module;

The control ends of the positive power switch and the negative power switch are respectively input with the first control signal; the control end of the main driving switch is connected with the first compensation module.

6. The pixel circuit of claim 5, wherein the power supply module comprises: a positive power supply and a negative power supply;

the first end of the positive power switch is connected with the positive power supply, and the second electrode of the light-emitting element is connected with the negative power supply.

7. The pixel circuit of claim 5, wherein the first compensation module comprises: a voltage storage unit and a third switch;

the voltage storage unit is respectively connected with the first end, the second end and the control end of the main driving switch, and is used for inputting the display control signal and generating a first voltage difference;

the first end of the third switch is connected with a second power supply, the second end of the third switch is connected with the first end of the main driving switch, and the control end of the third switch is used for inputting the second control signal;

and when the third switch is in a conducting state under the action of the second control signal, the second power supply compensates the first voltage difference.

8. The pixel circuit of claim 7, wherein the voltage storage unit comprises: initializing a subunit, a fourth switch and a fifth switch;

the initialization subunit is respectively connected with the power supply module, the third power supply and the control end of the main driving switch, and is also connected with the second end of the main driving switch through the fourth switch; the first end of the fifth switch is connected with the first end of the main driving switch;

the initialization subunit is used for initializing the voltage of the control end of the main drive switch according to the input fourth control signal, and the main drive switch is in a conducting state; the second end of the fifth switch inputs the display control signal, and the first voltage difference is generated when the fourth switch and the fifth switch are in a conducting state;

the first voltage difference is a difference between a voltage value of the display control signal and a threshold voltage of the main driving switch.

9. The pixel circuit of claim 8, wherein the initialization subunit comprises: an energy storage element and a sixth switch;

the first end of the energy storage element is connected with the power supply module, the second end of the energy storage element is connected with the first end of the sixth switch, and the second end of the sixth switch is connected with the third power supply; the control end of the sixth switch is used for inputting the fourth control signal;

When the sixth switch is in a conducting state under the action of the fourth control signal, the control end of the main driving switch is initialized, and the initialization voltage is the output voltage of the third power supply.

10. An electronic device comprising the pixel circuit according to any one of claims 1 to 9.

11. A control method of a pixel circuit, characterized by being applied to the electronic device of claim 10, the method comprising:

12. The method according to claim 11, wherein the first period and the second period are periods in which the pixel circuit is in a display region.

13. The method according to claim 11, wherein the third period is a period in which the pixel circuit is in a non-display region, and the first control signal controls the light emitting element to be turned on.

14. A control device of a pixel circuit, characterized by being applied to the electronic apparatus of claim 10, the device comprising:

15. The control device of a pixel circuit according to claim 14, wherein the first period and the second period are periods in which the pixel circuit is in a display region.

16. The control device for a pixel circuit according to claim 14, wherein the third period is a period in which the pixel circuit is in a non-display region, and the first control signal controls the light emitting element to be turned on.