CN111833814A - Pixel circuit, display panel and driving method thereof - Google Patents
Pixel circuit, display panel and driving method thereof Download PDFInfo
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- CN111833814A CN111833814A CN202010748887.8A CN202010748887A CN111833814A CN 111833814 A CN111833814 A CN 111833814A CN 202010748887 A CN202010748887 A CN 202010748887A CN 111833814 A CN111833814 A CN 111833814A
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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
Abstract
The invention discloses a pixel circuit, a display panel and a driving method thereof, wherein the pixel circuit comprises: the device comprises a writing/compensating module, a capacitor, a resetting module, a driving transistor and a light-emitting device; the writing/compensating module provides a first reference voltage to the grid electrode of the driving transistor through the data line under the control of the scanning line in a reset compensating phase; writing a data signal to the gate of the driving transistor through the data line under the control of the scan line in a data writing stage; the reset module is used for providing a reset signal of the reset signal line to the source electrode of the driving transistor under the control of the reset control line in the reset compensation phase; finally, the pixel circuit drives the light-emitting device to emit light in the light-emitting stage. The pixel circuit is simple in structure and only needs a scanning line and a reset control line for control, so that the occupied area is small, and high PPI can be realized. When the display panel is applied to the display panel, the required driving circuits are fewer, and the narrow frame design is facilitated.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a pixel circuit, a display panel and a driving method thereof.
Background
The current mature technologies in the Display field include Liquid Crystal Display (LCD) and active matrix Organic Light-Emitting Diode (OLED) Display. In the whole set of display system, the OLED product forms a pattern by exciting a spectrum of various wavelengths by recombination of electrons and holes. The display panel formed by the OLED technology has a fast response speed, and simultaneously can achieve the maximum contrast ratio, so that the OLED display panel is expected to become a next generation display mainstream product.
Generally, an OLED display panel includes: the display device comprises a grid driving device, a display panel, a data driver and a time schedule controller. Wherein the gate driving device includes: a separate gate drive integrated circuit, or a panel gate drive circuit. And the display panel includes: data lines, gate lines, and pixels controlled by them. In a general operation mode, the gate driving device supplies a gate driving signal to the gate lines, so that the pixels in a certain row receive a data voltage signal from the data lines, and the pixels emit light with different brightness according to the magnitude of the data voltage.
Since the current single gate driving integrated circuit cannot meet the requirements of a display panel such as narrow frame and low cost, the panel gate driving circuit is receiving more and more attention. The driving method of the conventional panel gate circuit is different due to different structures caused by different manufacturing processes, but the basic principle is similar.
In the prior art, in order to compensate for the threshold voltage of the driving transistor, the number of transistors in the pixel circuit is generally large, for example, the pixel circuit shown in fig. 1 includes 5 transistors T1-T5, needs 4 control lines for control, needs to occupy too much pixel area, and is not favorable for realizing high pixel density (Pixels Per inc, PPI). In addition, referring to the timing diagram shown in fig. 2, signals on 4 control lines need to be implemented by at least 4 driving circuits, which is not favorable for narrow-frame design.
Disclosure of Invention
Embodiments of the present invention provide a pixel circuit, a display panel and a driving method, so as to solve a problem in the prior art that the number of transistors in the pixel circuit is large, which is not favorable for improving PPI.
The embodiment of the invention provides a pixel circuit, which comprises: the device comprises a writing/compensating module, a capacitor, a resetting module, a driving transistor and a light-emitting device, wherein the writing/compensating module is used for writing data to the capacitor;
the capacitor is connected between the grid electrode and the source electrode of the driving transistor;
the drain electrode of the driving transistor is connected with a power supply voltage input end, wherein the power supply voltage input end is used for receiving power supply voltage in a reset compensation phase and a light-emitting phase;
the input end of the writing/compensating module is connected with the data line, the control end of the writing/compensating module is connected with the scanning line, and the output end of the writing/compensating module is connected with the grid electrode of the driving transistor; the writing/compensating module is used for providing a first reference voltage to the grid electrode of the driving transistor through the data line under the control of the scanning line in the reset compensating stage; writing a data signal to the gate of the driving transistor through the data line under the control of the scan line in a data writing stage;
the input end of the reset module is connected with a reset signal line, the control end of the reset module is connected with a reset control line, and the output end of the reset module is connected with the source electrode of the driving transistor; the reset module is used for providing a reset signal of the reset signal line to the source electrode of the driving transistor under the control of the reset control line in the reset compensation phase;
the input end of the light-emitting device is connected with the source electrode of the driving transistor, and the driving transistor is used for driving the light-emitting device to emit light in the light-emitting stage.
Optionally, the write/compensation module comprises: a first switching transistor, wherein;
the grid electrode of the first switch transistor is connected with the scanning line, the source electrode of the first switch transistor is connected with the data line, and the drain electrode of the first switch transistor is connected with the grid electrode of the driving transistor.
Optionally, the reset module includes: a second switching transistor, wherein;
the grid electrode of the second switch transistor is connected with the reset control line, the source electrode of the second switch transistor is connected with the reset signal line, and the drain electrode of the second switch transistor is connected with the source electrode of the driving transistor.
Optionally, the pixel circuit further comprises: a third switching transistor; wherein:
the grid electrode of the third switching transistor is electrically connected with the light-emitting control line, the source electrode of the third switching transistor is connected with a power supply voltage line, and the drain electrode of the third switching transistor is connected with the power supply voltage input end.
Correspondingly, the invention further provides a display panel, which comprises a display area and a frame area, wherein the display area comprises a plurality of pixel circuits provided by the embodiment of the invention.
Correspondingly, the present invention further provides a display panel, wherein the display panel includes a display area and a frame area, and the display area includes: a plurality of pixel circuits of any one of the above embodiments of the present invention arranged in a matrix, and a plurality of power supply voltage connection lines; each power supply voltage connecting line is connected with the power supply voltage input end of one column or one row of the pixel circuit;
the frame area comprises power supply voltage signal lines, the power supply voltage signal lines are connected with the power supply voltage connecting lines, and the power supply voltage signal lines are used for providing power supply voltage signals for the power supply voltage connecting lines.
Correspondingly, the present invention further provides a display panel, wherein the display panel includes a display area and a frame area, and the display area includes: a plurality of pixel circuits of any one of the above embodiments of the present invention arranged in a matrix, and a plurality of power supply voltage connection lines; each power supply voltage connecting line is connected with the power supply voltage input end of one column or one row of the pixel circuit;
the frame region includes power supply voltage line and with the switch circuit that many power supply voltage connecting wires correspond, switch circuit is used for making under the control of luminous control line power supply voltage line with many power supply voltage connecting wires all switch on.
Optionally, the switch circuit includes a plurality of fourth switch transistors, and each fourth switch transistor corresponds to one power supply voltage connection line;
the grid electrode of each fourth switching transistor is connected with the light-emitting control line, the source electrode of each fourth switching transistor is connected with the power supply voltage line, and the drain electrode of each fourth switching transistor is connected with the corresponding power supply voltage connecting line.
Optionally, the plurality of fourth switching transistors are arranged in the frame region in a row direction or a column direction.
Optionally, the switching circuit comprises a fourth switching transistor;
the grid of fourth switch transistor with the control line that gives out light is connected, fourth switch transistor's source with mains voltage line connects, fourth switch transistor's drain electrode with many mains voltage connecting wires all are connected.
Correspondingly, an embodiment of the present invention further provides a driving method of the display panel, including:
in the reset compensation phase, a power supply voltage is input to the power supply voltage input end, and the reset modules in all the pixel circuits supply the reset signal of the reset signal line to the source electrode of the driving transistor under the control of the reset control line; the writing/compensating modules in all the pixel circuits provide a first reference voltage to the gate electrode of the driving transistor through the data line under the control of the scanning line;
in the data writing stage, the writing/compensating modules in the pixel circuit are controlled row by row to write data signals into the grid electrode of the driving transistor through the data line under the control of the scanning line;
in the light emitting stage, a power supply voltage is input to the power supply voltage input end, and the driving transistors in all the pixel circuits drive the corresponding light emitting devices to emit light.
The invention has the following beneficial effects:
the pixel circuit, the display panel and the driving method thereof provided by the embodiment of the invention comprise the following steps: the device comprises a writing/compensating module, a capacitor, a resetting module, a driving transistor and a light-emitting device; the writing/compensating module is used for providing a first reference voltage to the grid electrode of the driving transistor through the data line under the control of the scanning line in a reset compensating stage; writing a data signal to the gate of the driving transistor through the data line under the control of the scan line in a data writing stage; the reset module is used for providing a reset signal of the reset signal line to the source electrode of the driving transistor under the control of the reset control line in the reset compensation phase; finally, the pixel circuit drives the light-emitting device to emit light in the light-emitting stage. The pixel circuit has a simple structure, and only needs the scanning line and the reset control line to control the corresponding module, so that the pixel circuit occupies a small area and can realize high PPI. In addition, because the number of control lines is small, when the display panel is applied, the number of required driving circuits is small, and the narrow frame design is facilitated.
Drawings
FIG. 1 is a schematic diagram of a pixel circuit in the prior art;
FIG. 2 is a timing diagram of the pixel circuit shown in FIG. 1;
fig. 3 is a schematic structural diagram of a pixel circuit according to an embodiment of the invention;
fig. 4 is a schematic circuit diagram of a pixel circuit according to an embodiment of the present invention;
FIG. 5 is a timing diagram corresponding to the pixel circuit shown in FIGS. 3 and 4;
fig. 6 is a second schematic circuit diagram of a pixel circuit according to an embodiment of the present invention;
FIG. 7 is a timing diagram of the pixel circuit shown in FIG. 6;
fig. 8 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 9 is a second schematic structural diagram of a display panel according to an embodiment of the invention;
fig. 10 is a schematic circuit diagram of a display panel according to an embodiment of the present invention;
fig. 11 is a second schematic circuit diagram of a display panel according to an embodiment of the present invention;
fig. 12 is a flowchart of a driving method according to an embodiment of the present invention;
FIG. 13 is a timing diagram of the display panel shown in FIGS. 9-11;
fig. 14 is a timing diagram of the display panel shown in fig. 8.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The shapes and sizes of the various elements in the drawings are not to scale and are merely intended to illustrate the invention.
As shown in fig. 3, a pixel circuit according to an embodiment of the present invention includes:
a write/compensation module 01, a capacitor C, a reset module 02, a driving transistor T0, and a light emitting device D; wherein: the capacitor C is connected between the gate and the source of the driving transistor T0; the drain of the driving transistor T0 is connected to a power supply voltage input terminal IN for receiving a power supply voltage during a reset compensation phase and a light emitting phase; the input end of the write/compensation module 01 is connected with the data line DL, the control end thereof is connected with the scanning line SL, and the output end thereof is connected with the gate of the driving transistor T0; the write/compensation module 01 is configured to provide a first reference voltage to the gate of the driving transistor T0 through the data line DL under the control of the scan line SL during the reset compensation phase; writing a data signal to the gate of the driving transistor T0 through the data line DL under the control of the scan line SL in a data writing phase; the input end of the reset module 02 is connected with a reset signal line RL, the control end of the reset module is connected with a reset control line CL, and the output end of the reset module is connected with the source electrode of the driving transistor T0; the reset module 02 is configured to provide a reset signal of the reset signal line RL to the source of the driving transistor T0 under the control of the reset control line CL in the reset compensation phase; the input terminal of the light emitting device D is connected to the source of the driving transistor T0, and the driving transistor T0 is used for driving the light emitting device D to emit light during the light emitting period.
IN the pixel circuit provided by the embodiment of the present invention, IN the reset compensation phase, the power voltage input terminal IN receives a power voltage, and the reset module 02 provides a reset signal of the reset signal line RL to the source of the driving transistor T0 under the control of the reset control line CL to reset the source voltage of the driving transistor T0; the write/compensation module 01 in the pixel circuit provides a first reference voltage to the gate of the driving transistor T0 through the data line DL under the control of the scan line SL to achieve the capture of the threshold voltage of the driving transistor; in the data writing phase, the writing/compensating module 01 writes a data signal to the gate of the driving transistor T0 through the data line DL under the control of the scan line SL to implement data writing; IN the light emitting stage, a power supply voltage is received to the power supply voltage input terminal IN, and the driving transistor T0 drives the light emitting device D to emit light, thereby realizing internal compensation light emission of the pixel circuit.
The pixel circuit provided by the embodiment of the invention comprises the writing/compensating module 01, the capacitor C, the reset module 02, the driving transistor T0 and the light-emitting device D, has a simple structure, and only needs a scanning line and a reset control line to control the corresponding modules, so that the pixel circuit occupies a small area and can realize high PPI. In addition, because the number of control lines is small, when the display panel is applied, the number of required driving circuits is small, and the narrow frame design is facilitated.
The present invention will be described in detail with reference to specific examples. It should be noted that the present embodiment is intended to better explain the present invention, but not to limit the present invention.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 4, the writing/compensating module includes: a first switching transistor, wherein;
the source of the first switching transistor T1 is connected to a data line DL, the gate of the first switching transistor T1 is connected to a scan line SL, and the drain of the first switching transistor T1 is connected to the gate of the driving transistor T0.
The above is merely an example of the specific structure of the write/compensation module in the pixel circuit, and in the specific implementation, the specific structure of the write/compensation module is not limited to the above structure provided in the embodiment of the present invention, and may be other structures known to those skilled in the art, and is not limited herein.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 4, the reset module includes: a second switching transistor, wherein;
the source of the second switching transistor T2 is connected to a reset signal line RL, the gate of the second switching transistor T2 is connected to a reset control line CL, and the drain of the second switching transistor T2 is connected to the source of the driving transistor T0.
The above is merely an example of the specific structure of the reset module in the pixel circuit, and in the specific implementation, the specific structure of the reset module is not limited to the above structure provided by the embodiment of the present invention, and may be other structures known to those skilled in the art, and is not limited herein.
In a specific implementation, the light emitting device D may be a light emitting diode, and may also be another light emitting device, which is not limited herein.
The pixel circuit provided in the embodiment of the present invention is described by taking the driving transistor as an N-type transistor as an example, and the principle of the pixel circuit is the same as that of the pixel circuit in which the driving transistor is an N-type transistor in the case that the driving transistor is a P-type transistor, which is not limited herein.
Further, in the embodiment of the invention, in order to simplify the manufacturing process, all the switch transistors are N-type transistors or P-type transistors, which is not limited herein. In specific implementation, the N-type transistor is switched on when the grid electrode of the N-type transistor is a high-level signal, and is switched off when the grid electrode of the N-type transistor is a low-level signal; the P-type transistor is turned on when its gate is a low level signal and turned off when it is a high level signal.
The Transistor in the above embodiments of the present invention may be a Thin Film Transistor (TFT) or a Metal oxide semiconductor field effect Transistor (MOS), and is not limited herein. In a specific implementation, the sources and drains of these transistors may be interchanged.
The following describes the operation principle of the pixel circuit provided by the embodiment of the present invention with reference to the timing chart shown in fig. 5 by taking the pixel circuit shown in fig. 4 as an example.
During the reset compensation phase P1, the supply voltage is supplied to the supply voltage input IN. A high-level signal is supplied to the reset control line CL to turn on the second switching transistor T2, thereby resetting the reset signal V on the signal line RLRSTThe source of the driving transistor T0 is written through the reset signal line RL to reset the source voltage of the driving transistor T0; a high level signal is provided to the scan line SL to turn on the first switching transistor T1, and the first reference voltage V on the data line DLREFIs transmitted to the gate of the driving transistor T0 through the first switching transistor T1. Wherein VREFAnd VRSTNeed to satisfy VREF-VRST＞Vth，VthIs the threshold voltage of the driving transistor T0. The driving transistor T0 is turned on, and then a low level signal is provided to the reset control line CL to turn off the second switching transistor T2, so that the power voltage starts to charge the capacitor C through the driving transistor T0, and when the voltage difference charged to the capacitor C is VthAt this time, the driving transistor T0 is turned off, and the source voltage of the driving transistor T0 is VREF-Vth。
IN the data writing phase P2, a signal is not supplied to the power supply voltage input terminal IN, and a high voltage is supplied to the scan line SLA flat signal for controlling the conduction of the first switching transistor T1 to connect the data signal V on the data line DLdataThe gate of the driving transistor T0 is written. At this stage, the voltage at the gate of the driving transistor T0 is VdataThe voltage at the source of the driving transistor T0 is still VREF-Vth。
IN the light emitting period P3, the power supply voltage is supplied to the power supply voltage input terminal IN. At this time, the drain voltage of the driving transistor T0 is the power voltage, the driving transistor T0 is operated in the saturation state, and the operating current I flowing through the driving transistor T0 and driving the light emitting device D to emit light satisfies the formula according to the current characteristic in the saturation state: k (V)gs-Vth)2＝K(Vdata-VREF+Vth-Vth)2＝K(Vdata-VREF)2. Where K is a structural parameter, and this number is relatively stable in the same structure and can be calculated as a constant.
As can be seen from the above equation, the driving current I of the output of the driving transistor T0 at this time is not influenced by the threshold voltage V of the driving transistor T0thInfluence of voltage drop with supply voltage, only with data signal VdataAnd a first reference voltage VREFAccordingly, the problem of the threshold voltage shift and the voltage drop of the power voltage of the driving transistor T0 due to the process and the long-term operation are improved, thereby improving the display effect. In addition, compared with the prior art, the number of the TFTs and the number of the signal lines in the structure of the pixel circuit are reduced, and the PPI of the display panel is improved.
Further, in the embodiment of the present invention, as shown in fig. 6, the pixel circuit further includes: a third switching transistor T3; wherein: a gate of the third switching transistor T3 is connected to a light emission control line EM, a source of the third switching transistor T3 is connected to a power voltage line VDD, and a drain of the third switching transistor T3 is connected to the power voltage input terminal IN. Thereby, the switching of the power supply voltage to the power supply voltage input terminal IN is achieved by controlling the third switching transistor T3.
Specifically, the timing diagram for the pixel circuit shown in fig. 6 is shown in fig. 7. Compared with the pixel circuit shown in fig. 4, the third switching transistor T3 is turned on only in the reset compensation phase P1 and the light emitting phase P3, and the operation states of the other transistors are the same as the above example, and are not described again.
Based on the same inventive concept, the embodiment of the invention also provides a display panel. The display panel includes a display area including a plurality of pixel circuits and a bezel area. The implementation of the display panel can refer to the above embodiments of the pixel circuit, and repeated descriptions are omitted.
When the pixel circuit shown in fig. 3 provided in the embodiment of the present invention is applied to a display panel, as shown in fig. 8, the display panel includes a display area AA and a frame area BB, where the display area AA includes: a plurality of pixel circuits pix of the above-described embodiment and a plurality of power supply voltage connection lines VDDL arranged in a matrix; each of the power supply voltage connection lines VDDL is connected to the power supply voltage input terminals IN of one column or one row of the pixel circuits pix;
the border area BB includes a power supply voltage signal line VDDS connected to each of the power supply voltage connection lines VDDL, the power supply voltage signal line VDDS being configured to provide a power supply voltage signal to the plurality of power supply voltage connection lines VDDL.
In the present embodiment, the power voltage signal lines VDDS and the plurality of power voltage connection lines VDDL are disposed in the frame area BB, so that the PPI and the aperture ratio of the display panel are improved.
Optionally, when the pixel circuit shown in fig. 3 provided in the embodiment of the present invention is applied to a display panel, as shown in fig. 9, the display panel includes a display area AA and a frame area BB, where the display area AA includes: a plurality of pixel circuits pix of the above-described embodiment and a plurality of power supply voltage connection lines VDDL arranged in a matrix; each of the power supply voltage connection lines VDDL is connected to the power supply voltage input terminals IN of one column or one row of the pixel circuits pix;
the bezel region BB includes a power supply voltage line VDD and a switch circuit 10 corresponding to the plurality of power supply voltage connection lines VDDL, and the switch circuit 10 is configured to turn on the power supply voltage line VDD and the plurality of power supply voltage connection lines VDDL under the control of the light emission control line EM. In this embodiment, the power voltage line VDD, the plurality of power voltage connecting lines VDDL and the corresponding switch circuits 10 are disposed in the frame area BB, so that the PPI and the aperture ratio of the display panel are improved.
Alternatively, as shown in fig. 10, the switch circuit 10 includes a plurality of fourth switch transistors T4, each of the fourth switch transistors T4 corresponds to one of the power supply connection lines VDDL;
a gate of each of the fourth switching transistors T4 is connected to the emission control line EM, a source of each of the fourth switching transistors T4 is connected to the power voltage line VDD, and a drain of each of the fourth switching transistors T4 is connected to the corresponding power voltage connection line VDDL. This can simplify the structure of the switch circuit 10, thereby reducing the footprint of the switch circuit 10.
Alternatively, the plurality of fourth switching transistors T4 are arranged in the frame region BB in a row direction or a column direction.
Alternatively, as shown in fig. 11, the switching circuit 10 includes a fourth switching transistor T4; a gate of the fourth switching transistor T4 is connected to the emission control line EM, a source of the fourth switching transistor T4 is connected to the power voltage line VDD, and a drain of the fourth switching transistor is connected to the plurality of power voltage connection lines VDDL. This prevents the power supply voltage connection line VDDL from being connected to the drain of the fourth switching transistor T4 after the frame region BB is extended, and thus, the number of wirings in the widened region BB can be reduced.
Based on the same inventive concept, an embodiment of the present invention further provides a method for driving the display panel, as shown in fig. 12, including: fig. 13 shows a timing chart corresponding to the reset compensation phase, the data writing phase, and the light emission phase. The driving method includes:
s101, in a reset compensation stage, power supply voltage is input to a power supply voltage input end, and reset modules in all pixel circuits supply reset signals of reset signal lines to source electrodes of driving transistors under the control of reset control lines; the write/compensation modules in all the pixel circuits provide a first reference voltage to the gate of the driving transistor through the data line under the control of the scan line.
And S102, in a data writing stage, the writing/compensating modules in the pixel circuit are controlled row by row, so that data signals are written into the grid electrode of the driving transistor through the data line under the control of the scanning line.
And S103, in a light emitting stage, power supply voltage is input to the power supply voltage input end, and the driving transistors in all the pixel circuits drive the corresponding light emitting devices to emit light.
The following describes in detail any of the display panels provided by the embodiments of the present invention with reference to the timing chart shown in fig. 13, taking the display panel shown in fig. 11 as an example.
During the reset compensation phase P1, the emission control line EM supplies a high level signal to the gate of the fourth switching transistor T4, so that the fourth switching transistor T4 is turned on, and the power connection line VDDL supplies the power voltage to the power voltage input terminal IN. A high level signal is supplied to all the reset control lines CL to turn on the second switching transistor T2, thereby resetting the reset signal V on the signal line RLRSTThe source of the driving transistor T0 is written through the reset signal line RL to reset the source voltage of the driving transistor T0; a high level signal is provided to all the scan lines SL (1), SL (2) … … SL (n) to turn on the first switching transistor T1, and the first reference voltage V on the data line DLREFIs transmitted to the gate of the driving transistor T0 through the first switching transistor T1. Wherein n is a positive integer greater than 1, VREFAnd VRSTNeed to satisfy VREF-VRST＞Vth，VthIs the threshold voltage of the driving transistor T0. The driving transistor T0 is turned on, and then a low level signal is provided to the reset control line CL to turn off the second switching transistor T2, so that the power voltage starts to charge the capacitor C through the driving transistor T0, and when the voltage difference charged to the capacitor C is VthAt this time, the driving transistor T0 is turned off, and the source voltage of the driving transistor T0 is VREF-Vth。
In the data writing period P2, no signal is provided to the power supply voltage input terminal, and the scan lines SL (1), SL (2) … … SL (n) are controlled to provide high level row by rowThe signal, which in turn controls the conduction of the corresponding first switch transistor T1, will turn on the data signal V on the data line DLdataThe gates of the corresponding driving transistors T0 are sequentially written. At this stage, the voltage at the gate of the driving transistor T0 is VdataThe voltage at the source of the driving transistor T0 is still VREF-Vth。
IN the light emitting period P3, the light emission control line EM supplies a high level signal to the gate of the fourth switching transistor T4, so that the fourth switching transistor T4 is turned on, and the power connection line VDDL supplies the power voltage to the power voltage input terminals IN of all the pixel circuits. The drain voltage of the driving transistor T0 is the power supply voltage, the driving transistor T0 operates in a saturation state, and the light emitting devices of all the pixel circuits emit light. As can be seen from the saturation-state current characteristic, the operating current I flowing through the driving transistor T0 and driving the light emitting device D to emit light satisfies the formula: k (V)gs-Vth)2＝K(Vdata-VREF+Vth-Vth)2＝K(Vdata-VREF)2. Where K is a structural parameter, and this number is relatively stable in the same structure and can be calculated as a constant.
As can be seen from the above equation, the driving current I of the output of the driving transistor T0 at this time is not influenced by the threshold voltage V of the driving transistor T0thInfluence of voltage drop with supply voltage, only with data signal VdataAnd a first reference voltage VREFAccordingly, the problem of the threshold voltage shift and the voltage drop of the power voltage of the driving transistor T0 due to the process and the long-term operation are improved, thereby improving the display effect. In addition, compared with the prior art, the number of the TFTs and the number of the signal lines in the structure of the pixel circuit are reduced, and the PPI of the display panel is improved. Meanwhile, in the present embodiment, the power voltage line VDD, the plurality of power voltage connection lines VDDL, and the corresponding switch circuit 10 are disposed in the frame area BB, so that the PPI and the aperture ratio of the display panel are improved.
The following describes in detail any of the display panels provided by the embodiments of the present invention with reference to the timing chart shown in fig. 14, taking the display panel shown in fig. 8 as an example.
During the reset compensation phase P1, the supply voltage signal line VDDS provides the supply voltage signal to the supply connection lines VDDL of all the pixel circuits, so that the supply voltage signal is available to the supply voltage input terminals IN of all the pixel circuits. IN the data writing phase P2, the power supply voltage signal line VDDS supplies a low level signal to all the pixel circuit power supply voltage input terminals IN through the power supply voltage connection line VDDL. IN the light emitting phase P3, the power supply voltage signal line VDDS provides the power supply voltage connection line VDDL for supplying the power supply voltage signal to all of the pixel circuit power supply voltage inputs IN. The driving method of other structures of the display panel is the same as that of the previous embodiment, and the description thereof is omitted.
Specifically, the signal of the supply voltage signal line VDDS may be provided by various means, such as a Central Processing Unit (CPU), and the like, which are not limited herein.
The pixel circuit, the display panel and the driving method thereof provided by the embodiment of the invention comprise the following steps: the device comprises a writing/compensating module, a capacitor, a resetting module, a driving transistor and a light-emitting device; the writing/compensating module is used for providing a first reference voltage to the grid electrode of the driving transistor through the data line under the control of the scanning line in a reset compensating stage; writing a data signal to the gate of the driving transistor through the data line under the control of the scan line in a data writing stage; the reset module is used for providing a reset signal of the reset signal line to the source electrode of the driving transistor under the control of the reset control line in the reset compensation phase; finally, the pixel circuit drives the light-emitting device to emit light in the light-emitting stage. The pixel circuit has a simple structure, and only needs the scanning line and the reset control line to control the corresponding module, so that the pixel circuit occupies a small area and can realize high PPI. In addition, because the number of control lines is small, when the display panel is applied, the number of required driving circuits is small, and the narrow frame design is facilitated.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A pixel circuit, comprising: the device comprises a writing/compensating module, a capacitor, a resetting module, a driving transistor and a light-emitting device; wherein the content of the first and second substances,
the capacitor is connected between the grid electrode and the source electrode of the driving transistor;
the drain electrode of the driving transistor is connected with a power supply voltage input end, wherein the power supply voltage input end is used for receiving power supply voltage in a reset compensation phase and a light-emitting phase;
the input end of the writing/compensating module is connected with the data line, the control end of the writing/compensating module is connected with the scanning line, and the output end of the writing/compensating module is connected with the grid electrode of the driving transistor; the writing/compensating module is used for providing a first reference voltage to the grid electrode of the driving transistor through the data line under the control of the scanning line in the reset compensating stage; writing a data signal to the gate of the driving transistor through the data line under the control of the scan line in a data writing stage;
the input end of the reset module is connected with a reset signal line, the control end of the reset module is connected with a reset control line, and the output end of the reset module is connected with the source electrode of the driving transistor; the reset module is used for providing a reset signal of the reset signal line to the source electrode of the driving transistor under the control of the reset control line in the reset compensation phase;
the input end of the light-emitting device is connected with the source electrode of the driving transistor, and the driving transistor is used for driving the light-emitting device to emit light in the light-emitting stage.
2. The pixel circuit of claim 1, wherein the write/compensation module comprises: a first switching transistor; wherein the content of the first and second substances,
the grid electrode of the first switch transistor is connected with the scanning line, the source electrode of the first switch transistor is connected with the data line, and the drain electrode of the first switch transistor is connected with the grid electrode of the driving transistor.
3. The pixel circuit of claim 1, wherein the reset module comprises: a second switching transistor; wherein the content of the first and second substances,
the grid electrode of the second switch transistor is connected with the reset control line, the source electrode of the second switch transistor is connected with the reset signal line, and the drain electrode of the second switch transistor is connected with the source electrode of the driving transistor.
4. The pixel circuit according to any of claims 1-3, wherein the pixel circuit further comprises: a third switching transistor; wherein:
the grid electrode of the third switching transistor is electrically connected with the light-emitting control line, the source electrode of the third switching transistor is connected with a power supply voltage line, and the drain electrode of the third switching transistor is connected with the power supply voltage input end.
5. A display panel comprising a display area and a bezel area, wherein the display area comprises a plurality of pixel circuits according to any one of claims 1 to 4.
6. A display panel comprising a display area and a bezel area, the display area comprising: a plurality of pixel circuits according to any one of claims 1 to 3 arranged in a matrix and a plurality of power supply voltage connection lines, each of said power supply voltage connection lines connecting said power supply voltage input terminals of one column or one row of said pixel circuits;
the frame area comprises power supply voltage signal lines, the power supply voltage signal lines are connected with the power supply voltage connecting lines, and the power supply voltage signal lines are used for providing power supply voltage signals for the power supply voltage connecting lines.
7. A display panel comprising a display area and a bezel area, the display area comprising: a plurality of pixel circuits according to any one of claims 1 to 3 arranged in a matrix and a plurality of power supply voltage connection lines, each of said power supply voltage connection lines connecting said power supply voltage input terminals of one column or one row of said pixel circuits;
the frame region includes power supply voltage line and with the switch circuit that many power supply voltage connecting wires correspond, switch circuit is used for making under the control of luminous control line power supply voltage line with many power supply voltage connecting wires all switch on.
8. The display panel according to claim 7, wherein the switching circuit includes a plurality of fourth switching transistors, each of the fourth switching transistors corresponding to one of the power supply voltage connection lines;
the grid electrode of each fourth switching transistor is connected with the light-emitting control line, the source electrode of each fourth switching transistor is connected with the power supply voltage line, and the drain electrode of each fourth switching transistor is connected with the corresponding power supply voltage connecting line.
9. The display panel according to claim 7, wherein the switching circuit includes a fourth switching transistor;
the grid of fourth switch transistor with the control line that gives out light is connected, fourth switch transistor's source with mains voltage line connects, fourth switch transistor's drain electrode with many mains voltage connecting wires all are connected.
10. A driving method applied to the display panel according to any one of claims 5 to 9, comprising:
in the reset compensation phase, a power supply voltage is input to the power supply voltage input end, and the reset modules in all the pixel circuits supply the reset signal of the reset signal line to the source electrode of the driving transistor under the control of the reset control line; the writing/compensating modules in all the pixel circuits provide a first reference voltage to the gate electrode of the driving transistor through the data line under the control of the scanning line;
in the data writing stage, the writing/compensating modules in the pixel circuit are controlled row by row to write data signals into the grid electrode of the driving transistor through the data line under the control of the scanning line;
in the light emitting stage, a power supply voltage is input to the power supply voltage input end, and the driving transistors in all the pixel circuits drive the corresponding light emitting devices to emit light.
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