CN113257176A - Pixel driving circuit, driving method and display device - Google Patents
Pixel driving circuit, driving method and display device Download PDFInfo
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- CN113257176A CN113257176A CN202110517420.7A CN202110517420A CN113257176A CN 113257176 A CN113257176 A CN 113257176A CN 202110517420 A CN202110517420 A CN 202110517420A CN 113257176 A CN113257176 A CN 113257176A
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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]
Abstract
The invention discloses a pixel driving circuit, a driving method and a display device, comprising the following steps: a plurality of light emitting devices, a driving transistor, a control circuit, and a write compensation circuit. The write compensation circuit responds to the scanning signal, a data signal can be provided for the driving transistor, the threshold voltage of the driving transistor is compensated, so that the transistor with the compensated threshold voltage is driven to generate driving current according to the digital signal, the control circuit responds to the control signal, the driving current is provided for the device to be luminous, the initialization signal is provided for other luminous devices except the device to be luminous and the grid electrode of the driving transistor in the plurality of luminous devices, the luminous device to be luminous is driven to emit light, meanwhile, the grid electrode of the driving transistor and other luminous devices are initialized, and therefore the plurality of luminous devices can be controlled to alternately emit light under the control of the driving current.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a pixel driving circuit, a driving method, and a display device.
Background
Micro light emitting diode display devices, such as Micro-LED display devices, have advantages of low driving voltage, long life span, wide temperature resistance, and the like, and thus, the Micro light emitting diode display devices are receiving more and more attention.
In the Micro-LED display device in the prior art, a red Micro-LED, a green Micro-LED and a blue Micro-LED are used as a pixel unit, each Micro-LED is driven by a driving circuit, and the display gray scale of a light emitting device is controlled by controlling the driving current and the light emitting duration of the light emitting device.
However, in the prior art, signal crosstalk may exist between three LED chips in one display unit, and thus a new driving structure is required to solve the problem.
Disclosure of Invention
The embodiment of the invention provides a pixel driving circuit, a driving method and a display device, which are used for solving the problem of signal crosstalk between LED chips in the prior art.
The embodiment of the invention provides a pixel driving circuit, which comprises:
a plurality of light emitting devices configured to alternately emit light under control of a driving current;
a driving transistor configured to generate the driving current according to a data signal;
a control circuit configured to supply a low-level signal to a gate of the driving transistor, supply the driving current to a device to be emitted, and supply the low-level signal to the other light emitting devices except the device to be emitted among the plurality of light emitting devices in response to a control signal;
a write compensation circuit configured to supply the data signal to the driving transistor in response to a scan signal and compensate for a threshold voltage of the driving transistor.
Optionally, the control circuit includes an initialization control circuit, a conduction control circuit, and a light emission control circuit;
the initialization control circuit is electrically connected with an initialization signal terminal, a low level signal terminal and the gate of the driving transistor respectively, and the initialization control circuit is configured to provide a low level signal of the low level signal terminal to the gate of the driving transistor in response to an initialization signal of the initialization signal terminal;
the conduction control circuit is electrically connected with a conduction control signal terminal, a power supply terminal, a first pole of the driving transistor, a second pole of the driving transistor and the light-emitting control circuit respectively, and the conduction control circuit is configured to respond to a conduction signal of the conduction signal terminal, conduct the power supply terminal with the first pole of the driving transistor, and conduct the second pole of the driving transistor with the light-emitting control circuit;
a light-emitting control circuit electrically connected to the first light-emitting control signal terminal, the second light-emitting control signal terminal, the low-level signal terminal, the first electrode of the device to be emitted, the first electrodes of the other light-emitting devices, and the conduction control circuit, and the light emission control circuit is configured to supply the driving current output through the turn-on control circuit to a first pole of the device to be light-emitting, and supply a low-level signal of the low-level signal terminal to a first pole of the other light-emitting device in response to a first light emission control signal of the first light emission control signal terminal and a second control signal of the second light emission control signal terminal, wherein the first light-emitting control signal terminal is a light-emitting control signal terminal corresponding to the device to be illuminated, the second light-emitting control signal terminal is a light-emitting control signal terminal corresponding to other light-emitting devices.
Optionally, the conduction control circuit comprises a first transistor and a second transistor;
the grid electrode of the first transistor is electrically connected with the conduction control signal end, the first electrode of the first transistor is electrically connected with the power supply end, and the second electrode of the first transistor is electrically connected with the second electrode of the driving transistor;
the grid electrode of the second transistor is electrically connected with the conduction control signal end, the first electrode of the second transistor is electrically connected with the first electrode of the driving transistor, and the second electrode of the second transistor is connected with the light-emitting circuit.
Optionally, the initialization control circuit comprises a third transistor;
the gate of the third transistor is electrically connected to an initialization control signal terminal, the first electrode of the third transistor is electrically connected to a low level signal terminal, and the second electrode of the third transistor is electrically connected to the gate of the driving transistor.
Optionally, the light emission control circuit comprises a plurality of light emission control sub-circuits, each of which controls one of the light emitting devices, the light emission control sub-circuit comprising a fourth transistor and a plurality of fifth transistors;
a gate of the fourth transistor is electrically connected to a light emission control signal terminal of the light emitting device corresponding to the light emission control sub-circuit, a first electrode of the fourth transistor is electrically connected to a second electrode of the second transistor, and a second electrode of the fourth transistor is electrically connected to a first electrode of each of the fifth transistors and a first electrode of the light emitting device corresponding to the light emission control sub-circuit;
the grid electrode of the fifth transistor is electrically connected with the light-emitting control signal end of the light-emitting device corresponding to the other light-emitting control sub-circuit, and the second electrode of the fifth transistor is electrically connected with the low-level signal end.
Optionally, the write compensation circuit comprises a sixth transistor and a seventh transistor;
a grid electrode of the sixth transistor is electrically connected with a grid electrode and a scanning signal end of the seventh transistor, a first electrode of the sixth transistor is electrically connected with a data signal end, and a second electrode of the seventh transistor is electrically connected with a second electrode of the driving transistor;
a first pole of the seventh transistor is electrically connected to the first pole of the driving transistor, and a second pole of the seventh transistor is electrically connected to the gate of the driving transistor.
Optionally, a storage capacitor is further included;
the first electrode plate of the storage capacitor is electrically connected with the power supply end, and the second electrode plate of the storage capacitor is electrically connected with the grid electrode of the driving transistor.
Correspondingly, the embodiment of the invention also provides a display device which comprises any one of the pixel driving circuits provided by the embodiment of the invention.
Correspondingly, an embodiment of the present invention further provides a driving method of any one of the pixel driving circuits, including:
a reset stage: controlling the initialization control signal to be at a first level, and controlling the scanning signal, the conduction control signal and the light-emitting control signal to be at a second level, so that the control circuit provides a low-level signal to the grid electrode of the driving transistor;
and a write compensation stage: controlling the scanning signal to be at the first level, and controlling the initialization control signal, the conduction control signal and the light-emitting control signal to be at the second level, so that the write compensation circuit provides a data signal to the driving transistor and compensates for the threshold voltage of the driving transistor;
a light emitting stage: and controlling the on control signal to be the first level, alternately controlling the light emitting control signal corresponding to each light emitting device to be the first level, and controlling the initialization signal and the scanning signal to be the second level, so that the driving transistor generates the driving current according to a data signal, the driving current is alternately supplied to the plurality of light emitting devices, and a low level signal is alternately supplied to the plurality of light emitting devices, and the plurality of light emitting devices alternately emit light under the control of the driving current and the low level signal.
Optionally, the light emitting phase includes a first light emitting phase and a second light emitting phase, and the driving method further includes:
a first light-emitting stage, in which the turn-on control signal and the light-emitting control signal corresponding to the to-be-light-emitting device are controlled to be at the first level, the initialization control signal, the scanning signal, and the light-emitting control signal corresponding to the other light-emitting device are controlled to be at the second level, so that the driving transistor generates the driving current according to the data signal, the light-emitting control circuit provides the driving current to the to-be-light-emitting device, and provides the low-level signal to the other light-emitting device;
and a second light-emitting stage, in which the turn-on control signal and the light-emitting control signal corresponding to one of the other light-emitting devices are controlled to be at the first level, the initialization control signal, the scanning signal, the light-emitting control signal corresponding to the other light-emitting device except the one of the other light-emitting devices, and the light-emitting control signal corresponding to the device to be light-emitting are controlled to be at a second level, so that the driving transistor generates the driving current according to the data signal, the light-emitting control circuit provides the driving current to the one of the other light-emitting devices, and provides the low-level signal to the other light-emitting device except the one of the light-emitting devices and the device to be light-emitting.
Optionally, the method further includes:
and the writing compensation stage is used for charging the storage capacitor.
The invention has the following beneficial effects:
the pixel driving circuit, the driving method and the display device provided by the embodiment of the invention comprise the following steps: a plurality of light emitting devices, a driving transistor, a control circuit, and a write compensation circuit. The write compensation circuit responds to the scanning signal, a data signal can be provided for the driving transistor, the threshold voltage of the driving transistor is compensated, so that the transistor with the compensated threshold voltage is driven to generate driving current according to the digital signal, the control circuit responds to the control signal, the driving current is provided for the device to be luminous, the initialization signal is provided for other luminous devices except the device to be luminous and the grid electrode of the driving transistor in the plurality of luminous devices, the luminous device to be luminous is driven to emit light, meanwhile, the grid electrode of the driving transistor and other luminous devices are initialized, and therefore the plurality of luminous devices can be controlled to alternately emit light under the control of the driving current.
Drawings
Fig. 1 is a schematic diagram of some specific structures of a driving circuit provided in an embodiment of the present disclosure;
fig. 2 is a flowchart of a driving method provided by an embodiment of the disclosure;
fig. 3 is a circuit timing diagram of some driving circuits provided by the embodiment of the disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. And the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
It should be noted that the sizes and shapes of the various figures in the drawings are not to scale, but are merely intended to illustrate the present disclosure. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
The embodiment of the present disclosure provides a driving circuit, as shown in fig. 1, which may include:
a plurality of light emitting devices L configured to alternately emit light under control of a driving current;
a driving transistor M0 configured to generate a driving current according to a data signal;
a control circuit 10 configured to supply a low-level signal to the gate of the driving transistor M0, supply a driving current to the device to be light-emitting, and supply a low-level signal to the other light-emitting devices than the device to be light-emitting among the plurality of light-emitting devices in response to a control signal;
and a write compensation circuit 20 configured to supply the data signal to the driving transistor M0 in response to the scan signal and to compensate for a threshold voltage of the driving transistor M0.
The driving circuit provided in the embodiment of the invention may provide the data signal to the driving transistor M0 through the write compensation circuit 20 in response to the scan signal, and compensate the threshold voltage of the driving transistor M0, so as to drive the transistor M0 compensated for the threshold voltage to generate the driving current according to the digital signal, and provide the driving current to the device to be emitted through the control circuit 10 in response to the control signal, provide the initialization signal to the other light emitting devices except the device to be emitted and the gate M0 of the driving transistor among the plurality of light emitting devices, and initialize the gate of the driving transistor M0 and the other light emitting devices while driving the device to be emitted to emit light, so as to control the plurality of light emitting devices to emit light alternately under the control of the driving current.
In some embodiments, when embodied, as shown in fig. 1, the control circuit 10 may include an initialization control circuit 11, a turn-on control circuit 12, and a light emission control circuit 13;
an initialization control circuit 11 electrically connected to the initialization signal terminal Rst, the low-level signal terminal Vinit, and the gate of the driving transistor M0, respectively, and the initialization control circuit 11 is configured to supply a low-level signal of the low-level signal terminal Vinit to the gate of the driving transistor M0 in response to an initialization signal of the initialization signal terminal Rst;
a conduction control circuit 12 electrically connected to the conduction control signal terminal EM, the power supply terminal VDD, the first pole of the driving transistor M0, the second pole of the driving transistor M0, and the light emission control circuit 13, respectively, and the conduction control circuit 11 is configured to conduct the power supply terminal VDD to the first pole of the driving transistor M0 and the second pole of the driving transistor M0 to the light emission control circuit 13 in response to the conduction control signal EM;
a light emission control circuit 13 electrically connected to the first light emission control signal terminal EM0, the second light emission control signal terminal EM2, the low level signal terminal Vinit, the first pole of the device to be light emitted L1, the first pole of the other light emitting device L2, and the turn-on control circuit 12, respectively, the light emission control circuit 13 being configured to supply the driving current output through the turn-on control circuit 12 to the first pole of the device to be light emitted L1 and supply the low level signal of the low level signal terminal Vinit to the first pole of the other light emitting device L2 in response to the first light emission control signal of the first light emission control signal terminal EM0 and the second control signal of the second light emission control signal terminal EM2, wherein the first light emission control signal terminal EM0 is a light emission control signal terminal corresponding to the device to be light emitted L1, and the second light emission control signal terminal EM2 is a light emission control signal terminal corresponding to the other light emitting device.
Illustratively, a low level signal may be supplied to the gate of the driving transistor M0 in response to the initialization signal through the initialization control circuit 11 to initialize the driving transistor M0. Also, since the turn-on control circuit turns on the power source terminal VDD and the first electrode of the driving transistor M0 in response to the turn-on control signal, the second stage of the driving transistor M0 and the light emission control circuit 13 are turned on to supply the driving current generated through the driving transistor M0 to the light emission control circuit. The light emission control circuit 13 supplies a driving current to the to-be-light-emitting device L1 and supplies a low level signal to the other light-emitting devices L2 except the to-be-light-emitting device L1 among the plurality of light-emitting devices L in response to the first and second light emission control signals EM0 and EM2 to make the to-be-light-emitting device L1 emit light and the other light-emitting devices L2 not emit light, and specifically, the light emission control circuit 13 may make the plurality of light-emitting devices alternately emit light under the control of the first and second light emission control signals.
In a specific implementation, as shown in fig. 1, three light emitting devices L may be included in the embodiment of the present disclosure, a first pole of each light emitting device L is electrically connected to the light-emitting control circuit 13, and a second pole of each light emitting device L is electrically connected to the power supply terminal VSS. The first electrode of the light emitting device L may be an anode thereof, and the second electrode may be a cathode thereof. For example, the Light Emitting devices L may be configured as electroluminescent diodes, such as Micro Light Emitting diodes (Micro LEDs), and specifically, the three Light Emitting devices L are blue Micro LEDs, and red QDs are disposed on one of the Micro LEDs, and green QDs are disposed on one of the Micro LEDs, so as to implement a color display function.
In particular implementation, in the embodiment of the present disclosure, as shown in fig. 1, the turn-on control circuit 12 includes a first transistor M1 and a second transistor M2;
a gate of the first transistor M1 is electrically connected to the turn-on control signal terminal EM, a first electrode of the first transistor M2 is electrically connected to the power source terminal VDD, and a second electrode of the first transistor M1 is electrically connected to the second electrode of the driving transistor M0;
the gate of the second transistor M2 is electrically connected to the on-control signal terminal EM, the first pole of the second transistor M2 is electrically connected to the first pole of the driving transistor M0, and the second pole of the second transistor M2 is electrically connected to the light emission control circuit 13.
In specific implementation, in the embodiment of the present disclosure, as shown in fig. 1, the initialization control circuit 11 includes a third transistor M3, a gate of the third transistor M3 is electrically connected to the initialization control signal terminal Rst, a first pole of the third transistor M3 is electrically connected to the low-level signal terminal Vinit, and a second pole of the third transistor M3 is electrically connected to the gate of the driving transistor M0.
In practical implementation, in the embodiment of the present disclosure, as shown in fig. 1, the light emission control circuit 13 includes three light emission control sub-circuits, which include fourth transistors M41, M42, M43, fifth transistors M51, M52, M53, M54, M55, M56;
a gate of the fourth transistor M41 is electrically connected to the emission control signal terminal EM1, a first pole of the fourth transistor M41 is electrically connected to a second pole of the second transistor M2, and a second pole of the fourth transistor M41 is electrically connected to a first pole of the fifth transistor M51, a first pole of the fifth transistor M52, and a first pole of the first light emitting device L1;
a gate of the fifth transistor M51 is electrically connected to the emission control signal terminal EM2 corresponding thereto, and a second stage of the fifth transistor M51 is electrically connected to the low level signal terminal Vinit;
a gate of the fifth transistor M52 is electrically connected to the emission control signal terminal EM3 corresponding thereto, and a second stage of the fifth transistor M52 is electrically connected to the low level signal terminal Vinit;
a gate of the fourth transistor M42 is electrically connected to the light emission control signal terminal EM2 corresponding thereto, a first pole of the fourth transistor M42 is electrically connected to a second pole of the second transistor M2, and a second pole of the fourth transistor M42 is electrically connected to a first pole of the fifth transistor M53, a first pole of the fifth transistor M54, and a first pole of the light emitting device L2;
a gate of the fifth transistor M53 is electrically connected to the emission control signal terminal EM1 corresponding thereto, and a second stage of the fifth transistor M53 is electrically connected to the low level signal terminal Vinit;
a gate of the fifth transistor M54 is electrically connected to the emission control signal terminal EM3 corresponding thereto, and a second stage of the fifth transistor M54 is electrically connected to the low level signal terminal Vinit;
a gate of the fourth transistor M43 is electrically connected to the light emission control signal terminal EM3 corresponding thereto, a first pole of the fourth transistor M43 is electrically connected to a second pole of the second transistor M2, and a second pole of the fourth transistor M43 is electrically connected to a first pole of the fifth transistor M55, a first pole of the fifth transistor M56, and a first pole of the light emitting device L3;
a gate of the fifth transistor M55 is electrically connected to the emission control signal terminal EM1 corresponding thereto, and a second stage of the fifth transistor M55 is electrically connected to the low level signal terminal Vinit;
a gate of the fifth transistor M56 is electrically connected to the light emission control signal terminal EM2 corresponding thereto, and a second stage of the fifth transistor M56 is electrically connected to the low level signal terminal Vinit.
In particular implementation, in the embodiment of the present disclosure, as shown in fig. 1, the write compensation circuit 20 includes a sixth transistor M6 and a seventh transistor M7;
a Gate of the sixth transistor M6 is electrically connected to the Gate of the seventh transistor M7 and the scan signal terminal Gate, a first pole of the sixth transistor M6 is electrically connected to the data signal terminal Date, and a second pole of the seventh transistor M7 is electrically connected to the second pole of the driving transistor M0;
a first pole of the seventh transistor M7 is electrically connected to the first pole of the driving transistor M0, and a second pole of the seventh transistor M7 is electrically connected to the gate of the driving transistor M0.
In the embodiment of the present invention, as shown in fig. 1, the driving transistor M0 may be a P-type transistor; the first electrode of the driving transistor M0 is the source thereof, the second electrode of the driving transistor M0 is the drain thereof, and when the driving transistor M0 is in saturation state, current flows from the source to the drain of the driving transistor M0.
Of course, in practical implementation, in the embodiment of the present invention, the driving transistor M0 may also be an N-type transistor; the first pole of the driving transistor M0 is the drain thereof, the second pole of the driving transistor M0 is the source thereof, and when the driving transistor M0 is in saturation state, current flows from the drain to the source of the driving transistor M0.
The specific structure of each circuit in the driving circuit provided in the embodiment of the present disclosure is merely illustrated, and in implementation, the specific structure of the circuit is not limited to the structure provided in the embodiment of the present disclosure, and may be other structures known to those skilled in the art, which are within the protection scope of the present disclosure, and are not limited herein.
Optionally, in order to reduce the manufacturing process, in practical implementation, in the embodiment of the present disclosure, as shown in fig. 1, the first to seventh transistors M1 to M7 may be all P-type transistors. Of course, the first to seventh transistors M1 to M7 may be all N-type transistors, which may be designed according to the actual application environment, and are not limited herein.
Further, in the embodiment of the present disclosure, the P-type transistor is turned off by a high level signal and turned on by a low level signal. The N-type transistor is turned on under the action of a high-level signal and is turned off under the action of a low-level signal.
Note that the Transistor mentioned in the above embodiments of the present disclosure 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, a first pole of the transistor can be used as a source electrode and a second pole as a drain electrode of the transistor according to the type of the transistor and a signal of a grid electrode of the transistor; or, conversely, the first pole of the transistor is used as the drain thereof, and the second pole is used as the source thereof, which can be designed according to the practical application environment, and is not particularly distinguished herein.
In this embodiment, the voltage VDD of the power supply terminal is generally a positive value, and the voltage VSS of the power supply terminal is generally a ground or negative value. In practical applications, the specific values of the power supply terminal voltage VDD and the power supply terminal voltage VSS may be designed and determined according to practical application environments, and are not limited herein.
As shown in fig. 1, the driving circuit according to the embodiment of the present invention may further include a storage capacitor Cst, wherein a first electrode plate of the storage capacitor Cst is electrically connected to the power source terminal VDD, and a second electrode plate of the storage capacitor Cst is electrically connected to the gate of the driving transistor M0.
When the first transistor M1 is turned on, the storage capacitor Cst may stabilize charges at a certain value across the first pole of the driving transistor M0 and the second pole of the driving transistor M0, and thus may stabilize a driving current.
An embodiment of the present invention further provides a driving method of the driving circuit, as shown in fig. 2, the driving method may include the following steps:
s21, resetting: controlling the initialization control signal to be at a first level, and controlling the scanning signal, the conduction control signal and the light-emitting control signal to be at a second level, so that the control circuit provides a low-level signal to the grid electrode of the driving transistor;
s22, writing compensation stage: the scanning signal is controlled to be at a first level, the initialization control signal, the conduction control signal and the light-emitting control signal are all at a second level, so that the writing compensation circuit provides the data signal to the driving transistor and compensates the threshold voltage of the driving transistor;
s23, light emitting stage: and controlling the conduction control signal to be at a first level, alternately controlling the light-emitting control signals corresponding to the light-emitting devices to be at the first level, and controlling the initialization signal and the scanning signal to be at a second level, so that the driving transistor generates a driving current according to the data signal, the driving current is alternately supplied to the plurality of light-emitting devices, and the low-level signal is alternately supplied to the plurality of light-emitting devices, and the plurality of light-emitting devices alternately emit light under the control of the driving current and the low-level signal.
In the driving method provided by the embodiment of the invention, in the reset stage, the control circuit responds to the initialization control signal and provides the low-level signal to the gate of the driving transistor so as to initialize the driving transistor. In the write compensation phase, a data signal is supplied to the driving transistor in response to the scan signal through the write compensation circuit, and the threshold voltage of the driving transistor is compensated so that the voltage-compensated driving transistor can generate a driving current according to the data signal in the light emission phase, and the driving current is alternately supplied to the plurality of light emitting devices and a low-level signal is alternately supplied to the plurality of light emitting devices in response to the turn-on control signal and the light emission control signal through the control circuit, thereby enabling the plurality of light emitting devices to alternately emit light.
In the embodiment of the invention, the low-level signal is alternately supplied to the plurality of light-emitting devices, so that the crosstalk among the light-emitting devices can be improved, and the display effect is improved.
In practical implementation, in the embodiment of the present invention, the light-emitting phase may include a first light-emitting phase and a second light-emitting phase;
in the first light-emitting stage, the conduction control signal and the light-emitting control signal corresponding to the to-be-emitted device are controlled to be at a first level, the initialization control signal, the scanning signal and the light-emitting control signal corresponding to other light-emitting devices are controlled to be at a second level, so that the driving transistor generates driving current according to the data signal, the light-emitting control circuit provides the driving current to the to-be-emitted device and provides a low-level signal to other light-emitting devices;
and in the second light-emitting stage, the conduction control signal and the light-emitting control signal corresponding to one other light-emitting device are controlled to be at the first level, the initialization control signal, the scanning control signal, the light-emitting control signals corresponding to other light-emitting devices except the other light-emitting device and the light-emitting control signal corresponding to the to-be-emitted device are controlled to be at the second level, the driving transistor generates driving current according to the data signal, the light-emitting control circuit provides the driving current for the other light-emitting device, and the low-level signal is provided for the other light-emitting devices except the light-emitting device and the to-be-emitted device.
In a specific implementation, in the embodiment of the present invention, the storage capacitor may be charged in the write compensation stage.
The following describes the operation process of the driving circuit provided in the embodiment of the present disclosure, by taking the driving circuit shown in fig. 1 as an example, and combining the circuit timing chart shown in fig. 3.
As shown in fig. 3, Rst represents an initialization control signal, Gate represents a scan signal, EM represents a second turn-on control signal, EM1 represents a first emission control signal, EM2 represents the first emission control signal, and EM3 represents a third emission control signal. And, the operation of a driving circuit in a display frame may include: the reset phase T1, the write compensation phase T2, and the light emitting phase T3, taking the driving circuit diagram shown in fig. 1 as an example, the light emitting phase T3 includes a first light emitting phase T31, a second light emitting phase T32, and a third light emitting phase T33.
In the reset phase T1, the third transistor M3 is turned on under the control of the low level of the signal Rst, so that the low level signal of the low level signal terminal Vinit is provided to the gate of the driving transistor M0 through the third transistor M3, so that the voltage at the gate of the driving transistor M0 is Vinit, and the gate of the driving transistor M0 is initialized.
In the write compensation phase T2, the voltage of the Gate of the driving transistor M0 is the low level signal Vinit, so the driving transistor M0 is turned on, and the sixth transistor M6 and the seventh transistor M7 are turned on under the control of the low level of the signal Gate, the data signal connected to the first pole of the sixth transistor M6 is written into the driving transistor M0 through the sixth transistor M6, and after the seventh transistor M7 is turned on, the Gate of the driving transistor M0 is connected to the second pole of the driving transistor M0, so the Vth of the driving transistor M0 is compensated. At the same time, the storage capacitor Cst starts to charge.
In the first light emitting period T31, the first transistor M1 and the second transistor M2 are turned on under the control of the low level of the signal EM, while the fourth transistor M41, the fifth transistor M53 and the fifth transistor M55 are turned on under the control of the low level of the signal EM1, since the driving transistor M0 is also in a turned-on state, the driving transistor M0 is caused to generate a driving current and supply the driving current to the first pole of the light emitting device L1, and the low level signal Vinit is supplied to the first pole of the light emitting device L2 and the first pole of the light emitting device L3, so that the light emitting device L1 emits light and the light emitting devices L2 and L do not emit light.
In the second light emitting period T32, the first transistor M1 and the second transistor M2 are turned on under the control of the low level of the signal EM, and at the same time, the fourth transistor M42, the fifth transistor M51 and the fifth transistor M56 are turned on under the control of the low level of the signal EM2, since the driving transistor M0 is also in the on state, the driving transistor M0 is caused to generate a driving current and supply the driving current to the first pole of the light emitting device L2, and the low level signal Vinit is supplied to the first pole of the light emitting device L1 and the first pole of the light emitting device L3, so that the light emitting device L2 emits light and the light emitting devices L1 and L3 do not emit light.
In the third light emitting period T32, the first transistor M1 and the second transistor M2 are turned on under the control of the low level of the signal EM, and at the same time, the fourth transistor M43, the fifth transistor M52 and the fifth transistor M54 are turned on under the control of the low level of the signal EM3, since the driving transistor M0 is also in the on state, the driving transistor M0 is caused to generate a driving current and supply the driving current to the first pole of the light emitting device L3, and the low level signal Vinit is supplied to the first pole of the light emitting device L1 and the first pole of the light emitting device L2, so that the light emitting device L3 emits light and the light emitting devices L1 and L2 do not emit light.
In the embodiment of the invention, through the first light-emitting stage, the second light-emitting stage and the third light-emitting stage, three light-emitting devices can alternately emit light, the three light-emitting devices can be three Micro LEDs with the same current, and meanwhile, different gray scales can be controlled by controlling the duration of low levels of the light-emitting control signals EM, EM1, EM2 and EM 3.
When one of the light emitting devices emits light, the other light emitting devices do not emit light, and the anode voltage of the non-emitting light emitting device is set to be low level, so that the crosstalk phenomenon among the light emitting devices can be improved, and the display effect can be improved.
In the embodiment of the invention, the magnitude of the driving current is controlled by the data signal Date.
I＝1/2μCox(W/L)(ELVDD-Data_I)2
Where I is the driving current, μ is the mobility, Cox is the gate oxide capacitance, W/L is the width-to-length ratio of the driving transistor M0, ELVDD is the voltage of the power supply terminal VDD, and Data _ I is the magnitude of the Data signal.
Based on the same disclosure concept, the embodiment of the disclosure further provides a display device, which includes the driving circuit provided by the embodiment of the disclosure. The principle of the display device to solve the problem is similar to the aforementioned driving circuit, so the implementation of the display device can be referred to the implementation of the aforementioned driving circuit, and repeated descriptions are omitted here.
In particular implementation, in the embodiments of the present disclosure, the display device may include a display area, and the display area includes a plurality of pixel units arranged in an array. Each pixel unit includes a plurality of sub-pixels. Illustratively, the pixel unit may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, so that color mixing may be performed by red, green, and blue to realize a color display. Alternatively, the pixel unit may also include a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel, so that color display may be realized by performing color mixing of red, green, blue, and white. Of course, in practical applications, the light emitting color of the sub-pixels in the pixel unit may be determined according to practical application environments, and is not limited herein.
In practical implementation, in the embodiment of the present disclosure, each pixel unit may include the above-mentioned driving circuit, so that the pixel unit may implement electroluminescence display.
In specific implementation, in the embodiment of the present disclosure, the display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present disclosure.
The driving circuit, the driving method thereof and the display device provided by the embodiment of the disclosure can provide a data signal to the driving transistor M0 by the write compensation circuit 20 in response to a scan signal, and compensate the threshold voltage of the driving transistor M0, so that the driving transistor M0 compensated for the threshold voltage is driven to generate a driving current according to the digital signal, provide the driving current to the device to be emitted by the control circuit 10 in response to a control signal, provide an initialization signal to the other light emitting devices except the device to be emitted and the gate M0 of the driving transistor among the plurality of light emitting devices, initialize the gate of the driving transistor M0 and the other light emitting devices while driving the device to be emitted to emit light, and thus can control the plurality of light emitting devices to emit light alternately under the control of the driving current.
While preferred embodiments of the present disclosure 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. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the disclosure.
It will be apparent to those skilled in the art that various changes and modifications may be made to the disclosed embodiments without departing from the spirit and scope of the disclosed embodiments. Thus, if such modifications and variations of the embodiments of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is also intended to encompass such modifications and variations.
Claims (11)
1. A pixel driving circuit, comprising:
a plurality of light emitting devices configured to alternately emit light under control of a driving current;
a driving transistor configured to generate the driving current according to a data signal;
a control circuit configured to supply a low-level signal to a gate of the driving transistor, supply the driving current to a device to be emitted, and supply the low-level signal to the other light emitting devices except the device to be emitted among the plurality of light emitting devices in response to a control signal;
a write compensation circuit configured to supply the data signal to the driving transistor in response to a scan signal and compensate for a threshold voltage of the driving transistor.
2. The drive circuit according to claim 1, wherein the control circuit includes an initialization control circuit, a turn-on control circuit, and a light emission control circuit;
the initialization control circuit is electrically connected with an initialization signal terminal, a low level signal terminal and the gate of the driving transistor respectively, and the initialization control circuit is configured to provide a low level signal of the low level signal terminal to the gate of the driving transistor in response to an initialization signal of the initialization signal terminal;
the conduction control circuit is electrically connected with a conduction control signal terminal, a power supply terminal, a first pole of the driving transistor, a second pole of the driving transistor and the light-emitting control circuit respectively, and the conduction control circuit is configured to respond to a conduction signal of the conduction signal terminal, conduct the power supply terminal with the first pole of the driving transistor, and conduct the second pole of the driving transistor with the light-emitting control circuit;
a light-emitting control circuit electrically connected to the first light-emitting control signal terminal, the second light-emitting control signal terminal, the low-level signal terminal, the first electrode of the device to be emitted, the first electrodes of the other light-emitting devices, and the conduction control circuit, and the light emission control circuit is configured to supply the driving current output through the turn-on control circuit to a first pole of the device to be light-emitting, and supply a low-level signal of the low-level signal terminal to a first pole of the other light-emitting device in response to a first light emission control signal of the first light emission control signal terminal and a second control signal of the second light emission control signal terminal, wherein the first light-emitting control signal terminal is a light-emitting control signal terminal corresponding to the device to be illuminated, the second light-emitting control signal terminal is a light-emitting control signal terminal corresponding to other light-emitting devices.
3. The drive circuit according to claim 2, wherein the turn-on control circuit includes a first transistor and a second transistor;
the grid electrode of the first transistor is electrically connected with the conduction control signal end, the first electrode of the first transistor is electrically connected with the power supply end, and the second electrode of the first transistor is electrically connected with the second electrode of the driving transistor;
the grid electrode of the second transistor is electrically connected with the conduction control signal end, the first electrode of the second transistor is electrically connected with the first electrode of the driving transistor, and the second electrode of the second transistor is connected with the light-emitting circuit.
4. The drive circuit according to claim 2, wherein the initialization control circuit includes a third transistor;
the gate of the third transistor is electrically connected to an initialization control signal terminal, the first electrode of the third transistor is electrically connected to a low level signal terminal, and the second electrode of the third transistor is electrically connected to the gate of the driving transistor.
5. The circuit of claim 2, wherein the emission control circuit comprises a plurality of emission control subcircuits, each emission control subcircuit controlling one light emitting device, the emission control subcircuit comprising a fourth transistor and a plurality of fifth transistors;
a gate of the fourth transistor is electrically connected to a light emission control signal terminal of the light emitting device corresponding to the light emission control sub-circuit, a first electrode of the fourth transistor is electrically connected to a second electrode of the second transistor, and a second electrode of the fourth transistor is electrically connected to a first electrode of each of the fifth transistors and a first electrode of the light emitting device corresponding to the light emission control sub-circuit;
the grid electrode of the fifth transistor is electrically connected with the light-emitting control signal end of the light-emitting device corresponding to the other light-emitting control sub-circuit, and the second electrode of the fifth transistor is electrically connected with the low-level signal end.
6. The drive circuit according to claim 1, wherein the write compensation circuit includes a sixth transistor and a seventh transistor;
a grid electrode of the sixth transistor is electrically connected with a grid electrode and a scanning signal end of the seventh transistor, a first electrode of the sixth transistor is electrically connected with a data signal end, and a second electrode of the seventh transistor is electrically connected with a second electrode of the driving transistor;
a first pole of the seventh transistor is electrically connected to the first pole of the driving transistor, and a second pole of the seventh transistor is electrically connected to the gate of the driving transistor.
7. The drive circuit according to claim 1, further comprising a storage capacitor;
the first electrode plate of the storage capacitor is electrically connected with the power supply end, and the second electrode plate of the storage capacitor is electrically connected with the grid electrode of the driving transistor.
8. A display device comprising a driver circuit as claimed in any one of claims 1 to 7.
9. A pixel driving method based on the driving circuit of any one of claims 1 to 7, the method comprising:
a reset stage: controlling the initialization control signal to be at a first level, and controlling the scanning signal, the conduction control signal and the light-emitting control signal to be at a second level, so that the control circuit provides a low-level signal to the grid electrode of the driving transistor;
and a write compensation stage: controlling the scanning signal to be at the first level, and controlling the initialization control signal, the conduction control signal and the light-emitting control signal to be at the second level, so that the write compensation circuit provides a data signal to the driving transistor and compensates for the threshold voltage of the driving transistor;
a light emitting stage: and controlling the on control signal to be the first level, alternately controlling the light emitting control signal corresponding to each light emitting device to be the first level, and controlling the initialization signal and the scanning signal to be the second level, so that the driving transistor generates the driving current according to a data signal, the driving current is alternately supplied to the plurality of light emitting devices, and a low level signal is alternately supplied to the plurality of light emitting devices, and the plurality of light emitting devices alternately emit light under the control of the driving current and the low level signal.
10. The method of claim 9, wherein the lighting phase includes a first lighting phase and a second lighting phase, the driving method further comprising:
a first light-emitting stage, in which the turn-on control signal and the light-emitting control signal corresponding to the to-be-light-emitting device are controlled to be at the first level, the initialization control signal, the scanning signal, and the light-emitting control signal corresponding to the other light-emitting device are controlled to be at the second level, so that the driving transistor generates the driving current according to the data signal, the light-emitting control circuit provides the driving current to the to-be-light-emitting device, and provides the low-level signal to the other light-emitting device;
and a second light-emitting stage, in which the turn-on control signal and the light-emitting control signal corresponding to one of the other light-emitting devices are controlled to be at the first level, the initialization control signal, the scanning signal, the light-emitting control signal corresponding to the other light-emitting device except the one of the other light-emitting devices, and the light-emitting control signal corresponding to the device to be light-emitting are controlled to be at a second level, so that the driving transistor generates the driving current according to the data signal, the light-emitting control circuit provides the driving current to the one of the other light-emitting devices, and provides the low-level signal to the other light-emitting device except the one of the light-emitting devices and the device to be light-emitting.
11. The method of claim 9, further comprising:
and the writing compensation stage is used for charging the storage capacitor.
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