CN114299867B - Display panel, driving method thereof and display device - Google Patents
Display panel, driving method thereof and display device Download PDFInfo
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Abstract
The invention provides a display panel, a driving method thereof and a display device, comprising: a plurality of sub-pixels, wherein the sub-pixels comprise a pixel driving circuit and a light emitting element, and a first electrode end of the light emitting element and an output end of the pixel driving circuit are electrically connected to a first node; a first controllable switch module is electrically connected between the first nodes of at least two sub-pixels, wherein the first controllable switch module is turned on or off in response to a first control signal. The first controllable switch module is connected between the first nodes of at least two sub-pixels, and when the pixel driving circuit of one sub-pixel outputs the driving current to the light emitting element to fluctuate during scanning of the at least two sub-pixels, the purpose of stabilizing the fluctuating driving current can be achieved due to inflow of the driving current output by other electrically connected pixel driving circuits, the stability of the pixel driving circuit is improved, and the display effect of the display device is improved.
Description
Technical Field
The present invention relates to the field of display technologies, and more particularly, to a display panel, a driving method thereof, and a display device.
Background
With the continuous improvement of display technology, the requirements of display devices are also continuously improved, and among various display technologies, self-luminous display devices have been widely used in various electronic devices including electronic products such as computers and mobile phones, because of their advantages of self-luminescence, thinness, low power consumption, high contrast, high color gamut, and capability of realizing flexible display. The self-luminous elements in the existing self-luminous display device are generally organic light-emitting diodes (Organic Light Emitting Diode, OLED), quantum dot light-emitting diodes (Quantum Dot Light Emitting Diodes, QLED), micro light-emitting diodes (Micro Light Emitting Diodes, micro LED), and the like; in actual display, the pixel driving circuit outputs a driving current to drive the light emitting element to emit light, so that the display device achieves the purpose of displaying a picture. However, the display effect of the conventional display device is to be improved.
Disclosure of Invention
In view of the above, the present invention provides a display panel, a driving method thereof and a display device, which effectively solve the technical problems existing in the prior art, and improve the display effect of the display device.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
A display panel, comprising: a plurality of sub-pixels, wherein the sub-pixels comprise a pixel driving circuit and a light emitting element, and a first electrode end of the light emitting element and an output end of the pixel driving circuit are electrically connected to a first node;
a first controllable switch module is electrically connected between the first nodes of at least two sub-pixels, wherein the first controllable switch module is turned on or off in response to a first control signal.
Correspondingly, the invention also provides a driving method of the display panel, which is used for driving the display panel and comprises the following steps:
scanning any row of the sub-pixels in the at least one row of the sub-pixels;
the first controllable switch module is turned on or off in response to the first control signal.
Optionally, the first controllable switch module is turned on or off in response to the first control signal, including:
in the light emitting stage of the light emitting element of the sub-pixel, the first controllable switch module is turned on in response to the first control signal.
Correspondingly, the invention also provides a display device which comprises the display panel.
Compared with the prior art, the technical scheme provided by the invention has at least the following advantages:
The invention provides a display panel, a driving method thereof and a display device, comprising: a plurality of sub-pixels, wherein the sub-pixels comprise a pixel driving circuit and a light emitting element, and a first electrode end of the light emitting element and an output end of the pixel driving circuit are electrically connected to a first node; a first controllable switch module is electrically connected between the first nodes of at least two sub-pixels, wherein the first controllable switch module is turned on or off in response to a first control signal.
As can be seen from the above, according to the technical solution provided by the present invention, the first controllable switch module is connected between the first nodes of at least two sub-pixels, and when the driving current output from the pixel driving circuit of one sub-pixel to the light emitting element fluctuates during scanning of the at least two sub-pixels, the purpose of stabilizing the fluctuating driving current can be achieved due to the inflow of the driving current output from the other electrically connected pixel driving circuits, the stability of the pixel driving circuit is improved, and the display effect of the display device is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a structure of a plurality of connected sub-pixels according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another embodiment of a plurality of connected sub-pixels;
FIG. 4 is a schematic diagram of a structure of a plurality of connected sub-pixels according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a structure of a plurality of connected sub-pixels according to an embodiment of the present invention;
FIG. 6 is a timing diagram according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a structure of a plurality of connected sub-pixels according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a structure of a plurality of connected sub-pixels according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a structure of a plurality of connected sub-pixels according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a structure of a plurality of connected sub-pixels according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of a structure of a plurality of connected sub-pixels according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
Fig. 14 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 15 is a flow chart of a driving method according to an embodiment of the present invention;
fig. 16 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As described in the background art, with the increasing display technology, the demands of people for display devices are increasing, and among various display technologies, self-luminous display devices have been widely used in various electronic devices including computers, mobile phones, and other electronic products, because they have advantages of self-luminescence, thinness, low power consumption, high contrast, high color gamut, and capability of realizing flexible display. The self-luminous elements in the existing self-luminous display device are generally organic light-emitting diodes, quantum dot light-emitting diodes, micro light-emitting diodes and the like; in actual display, the pixel driving circuit outputs a driving current to drive the light emitting element to emit light, so that the display device achieves the purpose of displaying a picture. However, the display effect of the conventional display device is to be improved.
Based on the above, the embodiment of the invention provides a display panel, a driving method thereof and a display device, which effectively solve the technical problems existing in the prior art and improve the display effect of the display device.
In order to achieve the above objective, the technical solutions provided by the embodiments of the present invention are described in detail below, with reference to fig. 1 to 16.
Referring to fig. 1, a schematic structural diagram of a display panel according to an embodiment of the present invention is shown, where the display panel includes:
a plurality of sub-pixels Pi including a pixel driving circuit 100 and a light emitting element 200, a first electrode terminal of the light emitting element 200 and an output terminal of the pixel driving circuit 100 are electrically connected to a first node N1.
A first controllable switch module 310 is electrically connected between the first nodes N1 of at least two of the sub-pixels Pi, wherein the first controllable switch module 310 is turned on or off in response to a first control signal K1.
In an embodiment of the invention, the display panel includes a display area AA and a non-display area NA located at a periphery of the display area AA, wherein the plurality of sub-pixels Pi are located within the display area AA. And, the plurality of sub-pixels Pi provided in the embodiment of the present invention may be arranged in an array; and, at least two sub-pixels Pi connected to the first controllable switch module 310 between the first nodes may be a structure of sub-pixels Pi in the same row that are scanned simultaneously. For convenience of explanation, the following embodiments of the present invention will be described by taking a plurality of connected sub-pixels Pi as sub-pixels in the same row that are scanned simultaneously.
It will be appreciated that the present invention provides that at least two sub-pixels Pi to which the first controllable switch module 310 is connected are scanned simultaneously. Further, when the at least two sub-pixels Pi are scanned, the pixel driving circuit 100 of the sub-pixel Pi outputs a driving current to the light emitting element 200 electrically connected thereto, and the light emitting element 200 emits light in response to the driving current. Meanwhile, the first controllable switch module 310 is turned on during the process of outputting the driving current by the pixel driving circuits 100, so that when the driving current output by one of the pixel driving circuits 100 is waveguided, the driving current transmitted to the light emitting element 200 can be kept stable due to the inflow of the rest driving currents, thereby improving the stability of the pixel driving circuits 100 and improving the display effect of the display device.
In an embodiment of the present invention, the present invention may implement the function of the first controllable switch module using a transistor. Referring to fig. 2, a schematic structural diagram of a plurality of connected sub-pixels is provided, wherein two sub-pixels among the sub-pixels Pi electrically connected to the first controllable switch module 310 are defined as an adjustment sub-pixel Pit and a to-be-adjusted sub-pixel Pid, respectively, and the first controllable switch module 310 includes: the first end of the first controllable transistor M1 is electrically connected to the first node N1 of the adjustment sub-pixel Pit, the second end of the first controllable transistor M1 is electrically connected to the first node N1 of the sub-pixel Pid to be adjusted, and the gate of the first controllable transistor M1 is connected to the first control signal K1.
In an embodiment of the present invention, the conduction type of the first controllable transistor M1 provided in the embodiment of the present invention may be N-type or P-type, which is not particularly limited. In the embodiment of the invention, when the first controllable transistor M1 is an N-type transistor, at least in a part of the period in which the pixel driving circuit 100 of the sub-pixel Pi outputs the driving current, the first control signal K1 is at a high level to control the first controllable transistor M1 to be turned on. Alternatively, when the first controllable transistor M1 provided in the embodiment of the invention is a P-type transistor, at least in a part of the period in which the pixel driving circuit 100 of the sub-pixel Pi outputs the driving current, the first control signal K1 is at a low level to control the first controllable transistor M1 to be turned on.
In an embodiment of the present invention, when more sub-pixels are connected through the first controllable transistors, the conduction types of all the first controllable transistors may be the same, and the first control signals corresponding to the connected sub-pixels are the same signal. Referring to fig. 3, a schematic structural diagram of a plurality of connected sub-pixels according to another embodiment of the present invention is shown, wherein in the sub-pixels Pi in the same row, the conduction types of all the first controllable transistors M1 are the same, and all the first control signals K1 are the same control signal. The scanning stages of the sub-pixels Pi connected in the same row are the same, and the first control signals K1 of the connected sub-pixels are set to the same signal and provided by the same signal terminal, so that the number of signal terminals in the wiring can be reduced, and the wiring structure can be simplified.
In other embodiments of the present invention, the first control signals corresponding to the plurality of connected sub-pixels may also be mutually independent control signals, and are provided by respective corresponding signal terminals; and, at least one conduction type of the first controllable transistors corresponding to the plurality of connected sub-pixels provided by the embodiment of the invention may be different from the rest, so that specific design is required according to practical application.
In an embodiment of the present invention, the first control signal provided by the present invention may further multiplex the control signal in the pixel driving circuit. Referring to fig. 4, a schematic structural diagram of a plurality of connected sub-pixels according to an embodiment of the present invention is shown, wherein the pixel driving circuit 100 according to an embodiment of the present invention includes a driving transistor M0, a first light emitting control transistor Mf1 and a second light emitting control transistor Mf2, a first end of the first light emitting control transistor Mf1 is connected to a first power voltage V1, a second end of the first light emitting control transistor Mf1 is electrically connected to the first end of the driving transistor M0, and a gate of the first light emitting control transistor Mf1 is connected to a light emitting control signal Kf.
The first end of the second light-emitting control transistor Mf2 is electrically connected to the second end of the driving transistor M0, the second end of the second light-emitting control transistor Mf2 is electrically connected to the first electrode end of the light-emitting element 200, and the gate of the second light-emitting control transistor Mf2 is connected to the light-emitting control signal Kf. In the sub-pixels Pi in the same row, the conduction type of the first controllable transistor M1 is the same as the conduction type of the first light emitting control transistor Mf1 and the second light emitting control transistor Mf2, and the first control signal K1 and the light emitting control signal Kf are the same signal.
It can be understood that, the light emission control signal Kf provided by the embodiment of the present invention is used to control the first light emission control transistor Mf1 and the second light emission control transistor Mf2, and when the light emission control signal Kf controls the first light emission control transistor Mf1 and the second light emission control transistor Mf2 to be turned on, the driving current generated by the driving transistor M0 is transmitted to the light emitting element 200. Thus, when the light emission control transistor and the first controllable transistor M1 are transistors of the same conduction type, the first control signal K1 and the light emission control signal Kf are set to the same signal, so that the first controllable transistor M1 can be turned on to communicate between the first nodes N1 of the connected sub-pixels Pi while the driving current is transmitted to the light emitting element 200.
It should be noted that, the first controllable transistor M1 and the light-emitting control transistor provided in the embodiment of the present invention may be P-type transistors or N-type transistors, which are specifically selected according to practical applications.
The operation of the pixel driving circuit and the first controllable switch module according to the embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The following description will take the example in which the transistors are P-type transistors. The following specific structure of the pixel driving circuit provided in the embodiment of the present invention is only one of the applicable circuits of the present invention, and in other embodiments of the present invention, the pixel driving circuit may also have other circuit structures. Fig. 5 is a schematic structural diagram of a plurality of connected sub-pixels according to another embodiment of the present invention, and fig. 6 is a timing chart according to an embodiment of the present invention.
The pixel driving circuit 100 provided in the embodiment of the invention further includes a reset transistor Mr, a first data writing transistor Md1, a second data writing transistor Md2, and a storage capacitor C. The first end of the reset transistor Mr is connected to the reset voltage Vref, the second end of the reset transistor Mr is electrically connected with the grid electrode of the driving transistor M0, and the grid electrode of the reset transistor Mr is connected to the reset control signal Kr.
The first end of the first data transistor Md1 is connected to the data voltage Vdata, the second end of the first data transistor Md1 is electrically connected to the first end of the driving transistor M0, and the gate of the first data transistor Md1 is connected to the data control voltage Kd. The first terminal of the second data transistor Md2 is electrically connected to the second terminal of the driving transistor M0, the second terminal of the second data transistor Md2 is electrically connected to the gate of the driving transistor M0, and the gate of the second data transistor M0 is connected to the data control signal Kd. The first end of the storage capacitor C is connected to the first power voltage V1, the second end of the storage capacitor C is electrically connected to the gate of the driving transistor M0, and the second electrode of the light emitting element 200 is connected to the second power voltage V2.
The driving of the pixel driving circuit 100 provided by the embodiment of the invention includes a reset phase R101, a data writing phase R102 and a light emitting phase R103 which are sequentially performed.
In the reset phase R101, the reset control signal Kr is at a low level, and controls the reset transistor Kr to be turned on to transmit the reset voltage Vref to the gate of the driving transistor M0, thereby resetting the driving transistor M0. Meanwhile, the data control signal Kd and the light emission control signal Kf are at high level, so that the first light emission control transistor Mf1, the second light emission control transistor Mf2, the first data writing transistor Md1 and the second data writing transistor Md2 are all turned off. And, the first control signal K1 is at a high level, and controls the first controllable transistor M1 to be turned off.
In the data writing stage R102, the data control signal Kd is at a low level, and controls the first data writing transistor Md1 and the second data writing transistor Md2 to be turned on, the data voltage Vdata is transmitted to the first end of the driving transistor M0 through the first data writing transistor Md1, and then transmitted to the gate of the driving transistor M0 through the second data writing transistor Md2 after passing through the driving transistor M0, until the potential of the gate of the driving transistor M0 is Vdata-Vth, where Vth is the absolute value of the threshold voltage of the driving transistor M0. Meanwhile, the reset control signal Kr and the light emission control signal Kf are at high level, and the reset transistor Mr, the first light emission control transistor Mf1, and the second light emission control transistor Mf2 are turned off. And, the first control signal K1 is at a high level, and controls the first controllable transistor M1 to be turned off.
In the light emitting stage R103, the light emission control signal Kf is at a low level, and the first light emission control transistor Mf1 and the second light emission control transistor Mf2 are controlled to be turned on, so that the driving current generated by the driving transistor M0 is transmitted to the light emitting element 200. Wherein drive current i=k (Vgs-Vth) 2 ＝K*(V1-Vdata) 2 ，Vgs＝V1-Vdata+Vth, V1 is the first power supply voltage. Meanwhile, the reset control signal Kr and the data control signal Kd are at high level, and the reset transistor Mr, the first data writing transistor Md1, and the second data writing transistor Md2 are turned off. And the first control signal K1 is at a low level, and controls the first controllable transistor M1 to be turned on, so that the first nodes N1 of the connected sub-pixels Pi are communicated.
Referring to fig. 7, which is a schematic structural diagram of a plurality of connected sub-pixels according to an embodiment of the present invention, two sub-pixels among the sub-pixels Pi electrically connected to the first controllable switch module 310 are defined as an adjustment sub-pixel Pit and a to-be-adjusted sub-pixel Pid, wherein the display panel further includes:
a second controllable switch module 320, wherein the second controllable switch module 320 is electrically connected between the first node N1 of the adjustment sub-pixel Pit and the first electrode terminal of the light emitting element 200 of the adjustment sub-pixel Pid, and the output terminal of the pixel driving circuit 100 of the adjustment sub-pixel Pit and the first controllable switch module 310 are electrically connected to the first node N1 of the adjustment sub-pixel Pit; wherein the second controllable switch module 320 is turned on or off in response to the second control signal K2.
It will be appreciated that the first controllable switch module 310 and the second controllable switch module 320 between two connected sub-pixels do not operate simultaneously during the phase when the pixel driving circuit 100 outputs the driving current, i.e. during the light emitting phase R103; the first controllable switch module 310 controls the two connected first nodes N1 to be communicated during the first time, and the second controllable switch module 320 controls the output end of the pixel driving circuit 100 in the adjustment sub-pixel Pit to be disconnected from the first electrode end of the light emitting element 200, so that the driving current of the adjustment sub-pixel Pit flows into the light emitting element 200 of the sub-pixel Pid to be adjusted during the first time, so as to ensure that the light emitting element 200 of the sub-pixel Pid to be adjusted has high light emitting efficiency, and simultaneously controls the light emitting element 200 of the adjustment sub-pixel Pit to be in an off state during the first time, thereby avoiding the influence on the light emitting element 200 of the adjustment sub-pixel Pid; and at the second time, the first controllable switch module 310 controls the connection between the two connected first nodes N1 to be disconnected, and the second controllable switch module 320 controls the connection between the output end of the pixel driving circuit 100 in the adjustment sub-pixel Pit and the first electrode end of the light emitting element 200, so as to ensure that the light emitting element 200 of the adjustment sub-pixel Pit is lighted.
The invention is illustrated in fig. 7 by the example of two sub-pixels, and the first controllable switch module may be turned on in a time-sharing manner during the light emitting phase when more sub-pixels are included. Referring to fig. 8, a schematic structural diagram of a plurality of connected sub-pixels is provided according to an embodiment of the present invention, wherein in order to avoid confusing control signals, the adjustment sub-pixel Pit1 is marked with K1 corresponding to a first control signal and K2 corresponding to a second control signal, and the adjustment sub-pixel Pit2 is marked with K1 'corresponding to a first control signal and K2' corresponding to a second control signal. The connected sub-pixels include a sub-pixel to be adjusted Pid and two adjustment sub-pixels Pit1 and Pit2. During the light emitting phase R103 of the pixel driving circuit 100, at a first time, the first control signal K1 controls the first controllable switch module 310 to communicate between the adjustment sub-pixel Pit1 and the first node N1 of the sub-pixel Pid to be adjusted, and the second control signal K2 controls the second controllable switch module 320 to disconnect between the output terminal of the pixel driving circuit 100 in the adjustment sub-pixel Pit1 and the first electrode terminal of the light emitting element 200; meanwhile, the first control signal K1 'controls the first controllable switch module 310 to disconnect the adjustment sub-pixel Pit2 from the first node N1 of the sub-pixel Pid to be adjusted, and the second control signal K2' controls the second controllable switch module 320 to connect the output terminal of the pixel driving circuit 100 in the adjustment sub-pixel Pit2 to the first electrode terminal of the light emitting element 200. Then, at a second time, the first control signal K1 controls the first controllable switch module 310 to disconnect the adjustment sub-pixel Pit1 from the first node N1 of the sub-pixel Pid to be adjusted, and the second control signal K2 controls the second controllable switch module 320 to connect the output terminal of the pixel driving circuit 100 in the adjustment sub-pixel Pit1 to the first electrode terminal of the light emitting element 200; meanwhile, the first control signal K1 'controls the first controllable switch module 310 to connect the adjustment sub-pixel Pit2 to the first node N1 of the sub-pixel Pid to be adjusted, and the second control signal K2' controls the second controllable switch module 320 to disconnect the output terminal of the pixel driving circuit 100 in the adjustment sub-pixel Pit2 from the first electrode terminal of the light emitting element 200.
In an embodiment of the present invention, the present invention may implement the function of the second controllable switch module using a transistor. Referring to fig. 9, a schematic structural diagram of a plurality of connected sub-pixels according to an embodiment of the present invention is shown, where the second controllable switch module 320 according to an embodiment of the present invention includes: and a second controllable transistor M2, wherein a first end of the second controllable transistor M2 is electrically connected with the first node N1, a second end of the second controllable transistor M2 is electrically connected with the first electrode end of the light emitting element 200, and a gate of the second controllable transistor M2 is connected with the second control signal K2.
In an embodiment of the present invention, the present invention may implement the function of the first controllable switch module using a transistor. Referring to fig. 10, a schematic structural diagram of a plurality of connected sub-pixels according to an embodiment of the present invention is shown, where the first controllable switch module 310 according to an embodiment of the present invention includes: a first controllable transistor M1, wherein a first end of the first controllable transistor M1 is electrically connected with the first node N1 of the adjustment sub-pixel, a second end of the first controllable transistor M1 is electrically connected with the first node N1 of the sub-pixel Pid to be adjusted, a gate of the first controllable transistor M1 is connected with the first control signal K1, and a conduction type of the first controllable transistor M1 and a conduction type of the second controllable transistor M2 are the same; the at least two sub-pixels include one sub-pixel to be adjusted Pit and a plurality of adjustment sub-pixels, such as an adjustment sub-pixel Pid1 and an adjustment sub-pixel Pid2, wherein a first control signal K1 corresponding to at least one adjustment sub-pixel (such as the adjustment sub-pixel Pid 1) and a second control signal K2' corresponding to the other adjustment sub-pixels (such as the adjustment sub-pixel Pid 2) are the same signal; and/or, the second control signal K2 corresponding to the at least one adjustment sub-pixel (e.g., adjustment sub-pixel Pid 1) and the first control signal K1' corresponding to the rest of the adjustment sub-pixels (e.g., adjustment sub-pixel Pid 2) are the same signal.
It can be understood that when the plurality of connected sub-pixels include a plurality of adjustment sub-pixels, since the first controllable switch module corresponding to at least one adjustment sub-pixel is in time-sharing conduction with other first controllable switch modules, when the conduction types of the first controllable transistor and the second controllable transistor are the same, the first control signal corresponding to the at least one adjustment sub-pixel and the second control signal corresponding to the rest of adjustment sub-pixels are the same, and the second control signal corresponding to the at least one adjustment sub-pixel and the first control signal corresponding to the rest of adjustment sub-pixels are the same, so as to achieve the purpose of time-sharing control of the two groups of first controllable switch modules.
The first controllable transistor and the second controllable transistor corresponding to the same adjustment sub-pixel provided by the embodiment of the invention have opposite conduction types (namely, when the first controllable transistor is an N-type transistor, the second controllable transistor is a P-type transistor, or when the first controllable transistor is a P-type transistor, the second controllable transistor is an N-type transistor), and when the conduction types of the first controllable transistor of at least one adjustment sub-pixel and the first controllable transistors of the rest adjustment sub-pixels are opposite, all the first control signals and the second control signals provided by the embodiment of the invention can be the same signal, so that the purpose of time-sharing control of different first controllable transistors is realized. Referring to fig. 11 specifically, a schematic structural diagram of a plurality of connected sub-pixels according to an embodiment of the present invention is shown, wherein a first controllable transistor M1 between a sub-pixel Pit1 and a sub-pixel Pid to be adjusted is an N-type transistor, and a corresponding second controllable transistor M2 is a P-type transistor; and adjusting the first controllable transistor M1 between the sub-pixel Pit2 and the sub-pixel Pid to be adjusted to be a P-type transistor, and the corresponding second controllable transistor M2 is an N-type transistor, wherein the first control signal K1, the first control signal K1', the second control signal K2 and the second control signal K2' are common control signals. If the common control signal is at a low level at the first time in the light-emitting stage of the pixel driving circuit, the first controllable transistor M1 corresponding to the adjustment sub-pixel Pit1 is controlled to be turned off and the second controllable transistor M2 is controlled to be turned on; meanwhile, the first controllable transistor M1 corresponding to the adjustment sub-pixel Pit2 is controlled to be turned on and the second controllable transistor M2 is controlled to be turned off. When the common control signal is at a low level in the second time, the first controllable transistor M1 corresponding to the adjustment sub-pixel Pit1 is controlled to be turned on and the second controllable transistor M2 is controlled to be turned off; meanwhile, the first controllable transistor M1 corresponding to the adjustment sub-pixel Pit2 is controlled to be turned off and the second controllable transistor M2 is controlled to be turned on, so that the process of transmitting the driving current to the light emitting element 200 of the sub-pixel Pit to be adjusted in time sharing by the adjustment sub-pixels Pit1 and Pit2 is completed.
As described with reference to fig. 12, a schematic structural diagram of another display panel according to an embodiment of the present invention is provided, wherein the light-emitting efficiency a1 of the light-emitting element 200 of at least one of the at least two sub-pixels Pi is smaller than the light-emitting efficiency a2 of the light-emitting elements 200 of the remaining sub-pixels Pi. Therefore, the first node N1 of the sub-pixel Pi with light extraction efficiency a1 and the first node N1 of the sub-pixel Pi with light extraction efficiency a2 are connected, and the driving current of the sub-pixel Pi with light extraction efficiency a2 is split and flows to the light emitting element 200 of the sub-pixel Pi with light extraction efficiency a1 in the light emitting stage R103 of the pixel driving circuit 100, so that the light extraction efficiency of the light emitting element 200 of the sub-pixel Pi with light extraction efficiency a1 is improved, and the uniformity of display is ensured.
In an embodiment of the present invention, the light emitting element of the sub-pixel includes a red light emitting element, a green light emitting element and a blue light emitting element, wherein the at least two sub-pixels include the red light emitting element, the green light emitting element and the blue light emitting element, and further, a driving current of a blue light corresponding sub-pixel and a driving current of a green light sub-pixel will flow into the light emitting element of a red sub-pixel, so as to improve light emitting efficiency of the red light emitting element. Or the at least two sub-pixels comprise the red light emitting element and the green light emitting element, so that the driving current of the green sub-pixel can flow into the light emitting element of the red sub-pixel, and the light emitting efficiency of the red light emitting element is improved; or the at least two sub-pixels comprise the red light emitting element and the blue light emitting element, so that the driving current of the blue sub-pixel flows into the light emitting element of the red sub-pixel, and the light emitting efficiency of the red light emitting element is improved; or the at least two sub-pixels comprise the green light emitting element and the blue light emitting element, so that the driving current of the green sub-pixel flows into the light emitting element of the blue sub-pixel, and the light emitting efficiency of the blue light emitting element is improved.
In an implementation of the present invention, the first nodes of at least two sub-pixels provided by the present invention are connected, so that the driving current of the sub-pixel with high light extraction efficiency can be split into the light emitting element of the sub-pixel with low light extraction efficiency, so that the channel widths and the channel lengths of the driving transistor and the light emitting control transistor in the pixel driving circuit provided by the embodiment of the present invention can be reduced, the occupied area of the pixel driving circuit is reduced, and the pixel density of the panel is improved. The pixel driving circuit provided by the embodiment of the invention comprises a driving transistor, wherein the channel width of the driving transistor is 1-4 mu m, and the end point value is included; and the channel length of the driving transistor is 8-16 mu m, including end point values. Preferably, the channel length of the driving transistor provided by the embodiment of the invention may be 8 μm, and the channel width may be 4 μm.
The pixel driving circuit provided by the embodiment of the invention comprises a driving transistor, a first light-emitting control transistor and a second light-emitting control transistor, wherein the first end of the first light-emitting control transistor is connected with a first power supply voltage, the second end of the first light-emitting control transistor is electrically connected with the first end of the driving transistor, and the grid electrode of the first light-emitting control transistor is connected with a light-emitting control signal; the first end of the second light-emitting control transistor is electrically connected with the second end of the driving transistor, the second end of the second light-emitting control transistor is electrically connected with the first electrode end of the light-emitting element, and the grid electrode of the second light-emitting control transistor is connected with the light-emitting control signal (refer to the schematic structural diagram of the pixel driving circuit shown in fig. 5 for specific). Wherein at least one of the first light emission control transistor and the second light emission control transistor has a channel width of 1-4 μm, including end point values; and a channel length of 1-4 μm, inclusive. Preferably, the channel length of the light emission control transistor provided in the embodiment of the invention may be 4 μm, and the channel width may be 4 μm.
Referring to fig. 13, a schematic structural diagram of a display panel according to another embodiment of the present invention is shown, wherein the plurality of sub-pixels Pi are arranged in a pixel array, and in a row direction X of the sub-pixels Pi, the display panel includes a first driving circuit 410 and a second driving circuit 420 respectively located at two sides of the pixel array. The pixel array comprises a first row of the sub-pixels to an N row of the sub-pixels, wherein N is an integer greater than or equal to 1; any one of the first driving circuit and the second driving circuit includes a first output port to an nth output port, and the ith output port is electrically connected to the first controllable switch module 310 corresponding to the sub-pixel Pi in the ith row, and is configured to output the first control signal K1.
In an embodiment of the present invention, the driving circuit provided by the present invention may be an independent driving circuit, or the driving circuit may also be a driving circuit for multiplexing to generate the light emission control signal.
Referring to fig. 14, a schematic structural diagram of another display panel provided by the embodiment of the present invention is shown, and when the scheme provided by the embodiment of the present invention further includes a second controllable switch module 320, the display panel provided by the embodiment of the present invention may also include a first driving circuit 410 and a second driving circuit 420, where an i output port of any driving circuit is electrically connected to the first controllable switch module 310 and the second controllable module 320 corresponding to the i-th row of sub-pixels Pi, and is configured to output a first control signal K1 and a second control signal K2, where the first driving circuit 410 and the second driving circuit 420 are independently prepared circuit structures.
In an embodiment of the present invention, the plurality of sub-pixels provided by the present invention are arranged in a pixel array, at least one row of the sub-pixels includes a plurality of pixel units, and the pixel unit includes a plurality of the sub-pixels; wherein all the pixel units comprise the at least two sub-pixels. Or, all the pixel units provided by the embodiment of the invention include a plurality of first-type pixel units and a plurality of second-type pixel units, where the first-type pixel units include the at least two sub-pixels, and the first nodes of any two sub-pixels in the second-type pixel units are not electrically connected with the first controllable switch module.
Correspondingly, the embodiment of the invention also provides a driving method of the display panel, which is used for driving the display panel provided by any one of the embodiments. Referring to fig. 15, a flowchart of a driving method according to an embodiment of the present invention is shown, where the driving method includes:
s1, scanning the plurality of sub-pixels.
S2, the first controllable switch module is turned on or turned off in response to the first control signal.
It can be understood that the first controllable switch module is connected between the first nodes of at least two sub-pixels, and when the driving current output from the pixel driving circuit of one sub-pixel to the light emitting element fluctuates during scanning of the at least two sub-pixels, the purpose of stabilizing the fluctuating driving current can be achieved due to the inflow of the driving current output from the other electrically connected pixel driving circuits, the stability of the pixel driving circuit is improved, and the display effect of the display device is improved.
In an embodiment of the present invention, the first controllable switch module is turned on or off in response to the first control signal, including: in the light emitting stage of the light emitting element of the sub-pixel, the first controllable switch module is turned on in response to the first control signal.
In an embodiment of the present invention, when the display panel includes the second controllable switch module, the first controllable switch module is turned on or off in response to the first control signal, including: in the light-emitting stage of the light-emitting element of the sub-pixel, the first controllable switch module corresponding to at least one adjustment sub-pixel is turned off after being turned on for a preset time in response to the first control signal, and the second controllable switch module corresponding to at least one adjustment sub-pixel is turned on after being turned off for the preset time in response to the second control signal, wherein the preset time is smaller than the duration of the light-emitting stage. Furthermore, the purpose of time-sharing control of the conduction of the first controllable switch module can be achieved, more driving current flows into the light-emitting element of the sub-pixel to be adjusted, and the light-emitting efficiency of the light-emitting element of the sub-pixel to be adjusted is improved while the lighting of the light-emitting element of the sub-pixel to be adjusted is ensured.
Correspondingly, the embodiment of the invention also provides a display device, which comprises the display panel provided by any embodiment.
Referring to fig. 16, a schematic structural diagram of a display device according to an embodiment of the present invention is shown, where the display device 1000 according to an embodiment of the present invention may be a mobile terminal, and the display device 1000 includes a display panel according to any one of the above embodiments.
It should be noted that, the display device provided in the embodiment of the present invention may also be a notebook, a tablet computer, a wearable device, etc., which is not particularly limited.
The embodiment of the invention provides a display panel, a driving method thereof and a display device, wherein the display panel comprises the following components: a plurality of sub-pixels, wherein the sub-pixels comprise a pixel driving circuit and a light emitting element, and a first electrode end of the light emitting element and an output end of the pixel driving circuit are electrically connected to a first node; a first controllable switch module is electrically connected between the first nodes of at least two sub-pixels, wherein the first controllable switch module is turned on or off in response to a first control signal.
As can be seen from the foregoing, in the technical solution provided in the embodiments of the present invention, the first controllable switch module is connected between the first nodes of at least two sub-pixels, and when the driving current output from the pixel driving circuit of one of the sub-pixels to the light emitting element fluctuates during scanning the at least two sub-pixels, the purpose of stabilizing the driving current with fluctuation can be achieved due to the inflow of the driving current output from the other pixel driving circuits electrically connected, so that the stability of the pixel driving circuit is improved, and the display effect of the display device is improved.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (15)
1. A display panel, comprising: a plurality of sub-pixels, wherein the sub-pixels comprise a pixel driving circuit and a light emitting element, and a first electrode end of the light emitting element and an output end of the pixel driving circuit are electrically connected to a first node;
a first controllable switch module is electrically connected between the first nodes of at least two sub-pixels, wherein the first controllable switch module is turned on or off in response to a first control signal;
defining two of the sub-pixels electrically connected with the first controllable switch module as an adjustment sub-pixel and a sub-pixel to be adjusted, wherein the first controllable switch module comprises: and a first controllable transistor, wherein a first end of the first controllable transistor is electrically connected with the first node of the adjustment sub-pixel, a second end of the first controllable transistor is electrically connected with the first node of the sub-pixel to be adjusted, and a grid electrode of the first controllable transistor is connected with the first control signal, wherein in a light emitting stage of the light emitting element of the sub-pixel, the first controllable switch module is turned on in response to the first control signal.
2. The display panel of claim 1, wherein in the sub-pixels in the same row, the conduction types of all the first controllable transistors are the same, and all the first control signals are the same control signal.
3. The display panel according to claim 1, wherein the pixel driving circuit includes a driving transistor, a first light emitting control transistor, and a second light emitting control transistor, a first terminal of the first light emitting control transistor is connected to a first power supply voltage, a second terminal of the first light emitting control transistor is electrically connected to the first terminal of the driving transistor, and a gate of the first light emitting control transistor is connected to a light emitting control signal;
the first end of the second light-emitting control transistor is electrically connected with the second end of the driving transistor, the second end of the second light-emitting control transistor is electrically connected with the first electrode end of the light-emitting element, and the grid electrode of the second light-emitting control transistor is connected with the light-emitting control signal;
in the same row of the sub-pixels, the conduction type of the first controllable transistor is the same as that of the first light-emitting control transistor and the second light-emitting control transistor, and the first control signal and the light-emitting control signal are the same signal.
4. The display panel of claim 1, wherein two of the sub-pixels defining the sub-pixel to which the first controllable switch module is electrically connected are a tuning sub-pixel and a to-be-tuned sub-pixel, respectively, wherein the display panel further comprises:
the second controllable switch module is electrically connected between the first node of the adjustment sub-pixel and the first electrode end of the light emitting element of the adjustment sub-pixel, and the output end of the pixel driving circuit of the adjustment sub-pixel and the first controllable switch module are electrically connected to the first node of the adjustment sub-pixel;
wherein the second controllable switch module is turned on or off in response to a second control signal.
5. The display panel of claim 4, wherein the second controllable switch module comprises: and a first end of the second controllable transistor is electrically connected with the first node, a second end of the second controllable transistor is electrically connected with the first electrode end of the light-emitting element, and a grid electrode of the second controllable transistor is connected with the second control signal.
6. The display panel of claim 4, wherein the first controllable switch module comprises: a first controllable transistor, a first end of which is electrically connected with a first node of the adjustment sub-pixel, a second end of which is electrically connected with the first node of the sub-pixel to be adjusted, a grid electrode of which is connected with the first control signal, and the conduction types of the first controllable transistor and the second controllable transistor are the same;
The at least two sub-pixels comprise one sub-pixel to be adjusted and a plurality of sub-pixels to be adjusted, wherein a first control signal corresponding to at least one sub-pixel to be adjusted and a second control signal corresponding to the rest sub-pixels to be adjusted are the same signal; and/or the second control signal corresponding to the at least one adjustment sub-pixel and the first control signals corresponding to the rest adjustment sub-pixels are the same signal.
7. The display panel according to claim 1, wherein the light-emitting element of at least one of the at least two sub-pixels has a light-emitting efficiency smaller than that of the light-emitting elements of the remaining sub-pixels.
8. The display panel according to claim 7, wherein the light-emitting elements of the sub-pixels include a red light-emitting element, a green light-emitting element, and a blue light-emitting element, and wherein the red light-emitting element, the green light-emitting element, and the blue light-emitting element are included in the at least two of the sub-pixels; or,
the at least two sub-pixels comprise the red light emitting element and the green light emitting element; or,
the at least two sub-pixels comprise the red light emitting element and the blue light emitting element; or,
The at least two sub-pixels include the green light emitting element and the blue light emitting element therein.
9. The display panel according to claim 1, wherein the pixel driving circuit includes a driving transistor, wherein a channel width of the driving transistor is 1 to 4 μm, including an end point value;
and the channel length of the driving transistor is 8-16 mu m, including end point values.
10. The display panel according to claim 1, wherein the pixel driving circuit includes a driving transistor, a first light emitting control transistor, and a second light emitting control transistor, a first terminal of the first light emitting control transistor is connected to a first power supply voltage, a second terminal of the first light emitting control transistor is electrically connected to the first terminal of the driving transistor, and a gate of the first light emitting control transistor is connected to a light emitting control signal; the first end of the second light-emitting control transistor is electrically connected with the second end of the driving transistor, the second end of the second light-emitting control transistor is electrically connected with the first electrode end of the light-emitting element, and the grid electrode of the second light-emitting control transistor is connected with the light-emitting control signal;
wherein at least one of the first light emission control transistor and the second light emission control transistor has a channel width of 1-4 μm, including end point values; and a channel length of 1-4 μm, inclusive.
11. The display panel according to claim 1, wherein the plurality of sub-pixels are arranged in a pixel array, and the display panel includes a first driving line and a second driving line respectively located at both sides of the pixel array in the sub-pixel row direction;
the pixel array comprises a first row of the sub-pixels to an N row of the sub-pixels, wherein N is an integer greater than or equal to 1; any one of the first driving circuit and the second driving circuit comprises a first output port to an nth output port, and the ith output port is electrically connected with a first controllable switch module corresponding to the sub-pixels in the ith row and is used for outputting the first control signal.
12. The display panel of claim 1, wherein the plurality of sub-pixels are arranged in a pixel array, at least one row of the sub-pixels comprises a plurality of pixel units, and the pixel unit comprises a plurality of the sub-pixels;
wherein all the pixel units comprise the at least two sub-pixels; or,
the pixel units comprise a plurality of first-type pixel units and a plurality of second-type pixel units, wherein the first-type pixel units comprise at least two sub-pixels, and the first nodes of any two sub-pixels in the second-type pixel units are not electrically connected with the first controllable switch module.
13. A driving method of a display panel, characterized in that it is used for driving the display panel according to any one of claims 1 to 12, the driving method comprising:
scanning the plurality of subpixels;
the first controllable switch module is turned on or off in response to the first control signal, and is turned on in response to the first control signal in a light emitting stage of the light emitting element of the sub-pixel.
14. The driving method of a display panel according to claim 13, wherein two of the sub-pixels defined to be electrically connected to the first controllable switch module are respectively a tuning sub-pixel and a sub-pixel to be tuned, wherein the display panel further comprises: the second controllable switch module is electrically connected between the first node of the adjustment sub-pixel and the first electrode end of the light emitting element of the adjustment sub-pixel, and the output end of the pixel driving circuit of the adjustment sub-pixel and the first controllable switch module are electrically connected to the first node of the adjustment sub-pixel; wherein the second controllable switch module is turned on or off in response to a second control signal, and the first controllable switch module is turned on or off in response to the first control signal, comprising:
In the light-emitting stage of the light-emitting element of the sub-pixel, the first controllable switch module corresponding to at least one adjustment sub-pixel is turned off after being turned on for a preset time in response to the first control signal, and the second controllable switch module corresponding to at least one adjustment sub-pixel is turned on after being turned off for the preset time in response to the second control signal, wherein the preset time is smaller than the duration of the light-emitting stage.
15. A display device, characterized in that the display device comprises a display panel according to any one of claims 1-12.
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| CN110728946A (en) * | 2018-06-29 | 2020-01-24 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof and display panel |
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| CN110706641B (en) * | 2019-09-16 | 2021-07-06 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit and display device |
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