CN113393806A - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN113393806A CN113393806A CN202110742837.3A CN202110742837A CN113393806A CN 113393806 A CN113393806 A CN 113393806A CN 202110742837 A CN202110742837 A CN 202110742837A CN 113393806 A CN113393806 A CN 113393806A
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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]
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Abstract
The application discloses display panel and display device, light emitting component connects the initialization node through selecting the conduction component among the display panel, select the conduction component to make light emitting component and initialization node switch on at the demonstration stage, with connect pixel circuit, give out light under pixel circuit control and show, at non-demonstration stage, select the conduction component to make light emitting component and initialization node open circuit, avoid because when light emitting component's first electrode and second electrode connect conversely, give out light at non-demonstration stage. And the display panel is also provided with a first storage capacitor connected with the initialization node, when the initialization node is subjected to voltage reset through the first transistor, the first storage capacitor can store reset electric energy, and in a non-display stage after reset, the reset electric energy stored by the first storage capacitor can counteract leakage current of the transistor in the pixel circuit flowing through the initialization node, so that the light-emitting element is prevented from emitting light due to the leakage current in the non-light-emitting stage.
Description
Technical Field
The application relates to the technical field of display equipment, and more particularly relates to a display panel and a display device.
Background
With the continuous progress of science and technology, more and more display devices are widely applied to the daily life and work of people, bring great convenience to the daily life and work of people, and become an indispensable important tool for people at present.
The main component of the display device that realizes the display function is a display panel. The display panel has a plurality of sub-pixels for image display. For a display panel using a light-emitting element which can emit light actively as a sub-pixel, a pixel circuit is required to control the light-emitting element to perform light-emitting display.
In the conventional display panel, if two electrodes of the light emitting element are connected in opposite directions, the light emitting element emits light in a non-display stage, and the display effect is affected.
Disclosure of Invention
In view of the above, the present application provides a display panel and a display device, and the scheme is as follows:
a display panel, comprising:
a pixel circuit for driving the light emitting element to emit light;
the pixel circuit is electrically connected with the light-emitting element through the initialization node;
the pixel circuit comprises a first transistor, wherein a first pole of the first transistor is connected to a first signal end, a second pole of the first transistor is electrically connected with the initialization node, a control pole of the first transistor is connected with a first control signal, and the first transistor is used for responding to the first control signal and transmitting an electric signal of the first signal end to the initialization node;
the light-emitting element comprises a first electrode and a second electrode, the first electrode is connected with a first power supply voltage, the second electrode is connected with the initialization node through a selective conduction element, the selective conduction element is used for enabling the light-emitting element to be conducted with the initialization node in a display stage, and enabling the light-emitting element to be disconnected with the initialization node in a non-display stage;
the first pole plate of the first storage capacitor is connected with the initialization node, and the second pole plate is connected with a fixed potential.
The technical scheme of this application still provides a display device, includes above-mentioned display panel.
As can be seen from the above description, in the display panel and the display device provided in the technical solution of the present application, the pixel circuit includes the first transistor, the first electrode of the first transistor can be connected to the first signal terminal, the second electrode of the first transistor can be connected to the initialization node, the control electrode of the first transistor can be connected to the first control signal, and the control electrode of the first transistor can transmit the electrical signal of the first signal terminal to the initialization node based on the first control signal to reset the voltage of the initialization node. The light-emitting element is connected with the initialization node through the selective conduction element, the selective conduction element can enable the light-emitting element to be conducted with the initialization node in the display stage so as to be connected with the pixel circuit, light-emitting display is conducted under the control of the pixel circuit, the selective conduction element can enable the light-emitting element and the initialization node to be disconnected in the non-display stage, and light emission in the non-display stage is avoided when the first electrode and the second electrode of the light-emitting element are connected in the opposite direction. And the display panel is also provided with a first storage capacitor connected with the initialization node, when the initialization node is subjected to voltage reset through the first transistor, the first storage capacitor can store reset electric energy, and in a non-display stage after reset, the reset electric energy stored by the first storage capacitor can counteract leakage current of the transistor in the pixel circuit flowing through the initialization node, so that the light-emitting element is prevented from emitting light due to the leakage current in the non-light-emitting stage.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in related arts, the drawings used in the description of the embodiments or prior arts will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
The structures, proportions, and dimensions shown in the drawings and described in the specification are for illustrative purposes only and are not intended to limit the scope of the present disclosure, which is defined by the claims, but rather by the claims, it is understood that these drawings and their equivalents are merely illustrative and not intended to limit the scope of the present disclosure.
Fig. 1 is a schematic diagram of a circuit structure in a display panel according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another display panel provided in the embodiment of the present application;
fig. 4 is a schematic diagram of a circuit structure in another display panel according to an embodiment of the present disclosure;
FIG. 5 is an equivalent circuit diagram of the circuit shown in FIG. 4;
fig. 6 is a schematic structural diagram of another display panel provided in the embodiment of the present application;
fig. 7 is a schematic circuit diagram of another display panel according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a pixel circuit according to an embodiment of the present disclosure;
FIG. 9 is a schematic diagram illustrating a principle of selecting a conducting device to prevent abnormal light emission when two electrodes of a light emitting device are connected in reverse in an embodiment of the present application;
fig. 10 is a schematic diagram of a circuit structure in another display panel according to an embodiment of the present disclosure;
fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present application.
Detailed Description
Embodiments of the present application will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the application are shown, and in which it is to be understood that the embodiments described are merely illustrative of some, but not all, of the embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, fig. 1 is a schematic diagram of a circuit structure in a display panel according to an embodiment of the present disclosure, where the display panel includes:
a pixel circuit 11, the pixel circuit 11 being used for driving the light emitting element P to emit light;
the pixel circuit 11 is electrically connected to the light emitting element P through the initialization node N0;
the pixel circuit 11 includes a first transistor T1, a first electrode of the first transistor T1 is connected to the first signal terminal D1, a second electrode of the first transistor T1 is electrically connected to the initialization node N0, a control electrode of the first transistor T1 is connected to the first control signal S1, and the first transistor T1 is configured to transfer an electrical signal of the first signal terminal D1 to the initialization node N0 in response to the first control signal S1;
the light emitting element P includes a first electrode connected to a first power voltage E1 and a second electrode connected to the initialization node N0 through the selective turn-on element 12, the selective turn-on element 12 for turning on the light emitting element P and the initialization node N0 in the display period and turning off the light emitting element P and the initialization node N0 in the non-display period;
the first plate of the first storage capacitor C1 and the first plate of the first storage capacitor C1 are connected with the initialization node N0, and the second plate is connected with a fixed potential V0.
In the embodiment of the present application, the control electrode of the transistor is a gate, one of the first electrode and the second electrode is a source, and the other is a drain. The light emitting elements P are LEDs, including but not limited to Mini LEDs, Micro LEDs, and Nano LEDs.
For example, the Nano-rod LED technology is available, and the Nano-rod LED is self-assembled on the electrode by using a fluid diffusion and an electric field attraction manner. And the connection between the LED and the array backboard is realized. The pixel circuit can reset the anode of the LED, the reset voltage Vreset is generally lower than PVEE, the anode voltage is lower than the cathode voltage, and the normal LED can not emit light abnormally; and for the cathode and anode assembled LED, the LED is just forward conducted, and the pixel emits light abnormally, which affects normal display.
In the embodiment of the present application, the first transistor T1 is capable of transferring an electrical signal of the first signal terminal D1 to the initialization node N0 based on the first control signal S1, and resetting the voltage of the initialization node N0. The light emitting element P is connected to the initialization node N0 through the selective conduction element 12, the selective conduction element 12 can make the light emitting element P and the initialization node N0 conduct in the display phase to connect with the pixel circuit 11, and the light emitting display is performed under the control of the pixel circuit 11, in the non-display phase, the selective conduction element 12 can make the light emitting element P and the initialization node N0 break, and the light emission in the non-display phase is avoided when the first electrode and the second electrode of the light emitting element P are connected in reverse.
In addition, the display panel is further provided with a first storage capacitor C1 connected to the initialization node N0, when the initialization node N0 is reset by the first transistor T1, the first storage capacitor C1 can store reset power, and in a non-display period after reset, the reset power stored in the first storage capacitor C1 can counteract leakage current of the transistor in the pixel circuit 11 flowing through the initialization node N0, so that the light-emitting element P is prevented from emitting light due to the leakage current in the non-light-emitting period.
In the display panel provided in the embodiment of the present application, the capacitance value of the first storage capacitor C1 is greater than or equal to the capacitance value between the first electrode and the second electrode. When the capacitance of the first storage capacitor C1 is not less than the capacitance between the first electrode and the second electrode of the light emitting element P, the reset power stored in the first storage capacitor C1 during the voltage reset at the initialization node N0 is sufficient to counteract the leakage current of the transistor in the pixel circuit 11 flowing through the initialization node N0, so as to prevent the light emitting element P from emitting light due to the leakage current during the non-emitting period.
As shown in fig. 2, fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure, in which the display panel has multiple conductive layers M of different layers, one of the conductive layers M includes one plate of the first storage capacitor C1, and the other conductive layer M includes the other plate of the first storage capacitor C1. In the mode, the two electrode plates of the first storage capacitor C1 are manufactured by the two conductive layers M in the multiplexing display panel, a metal layer does not need to be added independently, the manufacturing process is simple, and the manufacturing cost is low.
As shown in fig. 1 and fig. 2, the display panel has a substrate 10, and the pixel circuit 11, the light emitting element P, the selective conduction element 12 and the first storage capacitor C1 are all disposed on the same side of the substrate 10.
The pixel circuit 11 includes a second storage capacitor. The second storage capacitor and the plurality of pixel transistors are interconnected to form a pixel circuit 11. The plurality of pixel transistors includes a first transistor T1.
As shown in fig. 3, fig. 3 is a schematic structural diagram of another display panel provided in this embodiment of the application, and in combination with the above embodiments, in the embodiment shown in fig. 3, one plate of the first storage capacitor C1 and one plate of the second storage capacitor C2 are located in the same conductive layer M, and the other plate of the first storage capacitor C1 and the other plate of the second storage capacitor C2 are located in the same conductive layer M. In this way, the first storage capacitor C1 is made by multiplexing two conductive layers where the second storage capacitor C2 is located in the pixel circuit 11, the polar plate of the first storage capacitor C1 is made while the polar plate of the second storage capacitor C2 is formed by patterning, and the polar plate of the first storage capacitor C1 only needs to be additionally reserved while the polar plate of the second storage capacitor C2 is formed by patterning the conductive layer M, so that additional and independent process steps are not required, and the method is compatible with the existing process method of the pixel circuit 11, simple in manufacturing process and low in manufacturing cost. Furthermore, the first storage capacitor C1 is made by multiplexing two conductive layers of the second storage capacitor C2, so that the capacitance of the first storage capacitor C1 is larger than or equal to the capacitance between the first electrode and the second electrode of the light emitting element P.
As shown in fig. 4 and 5, fig. 4 is a schematic circuit diagram of another display panel according to an embodiment of the present disclosure, fig. 5 is an equivalent circuit diagram of the circuit shown in fig. 4, and based on the manner shown in fig. 1, in the manner shown in fig. 4 and 5, the selected pass element 12 is the protection transistor T0, the first electrode of the protection transistor T0 is connected to the control electrode of the protection transistor T0, the first electrode of the protection transistor T0 is connected to the second electrode, and the second electrode of the protection transistor T0 is connected to the initialization node N0. In this way, the protection transistor T0 can be equivalent to a diode, and only allows the current flowing from the initialization node N0 to the light emitting element P to pass through, and blocks the current flowing from the light emitting element P to the initialization node N0. If the two electrodes of the light emitting element P are connected in the opposite direction, the current can be prevented from flowing from the first electrode to the second electrode by the protection transistor T0, and the light emitting element P is prevented from emitting light in the non-display period.
In the embodiment shown in fig. 5, the protection transistor is a P-type transistor (PMOS) for example, and the P-type transistor is turned on when the control electrode is at a low potential. At this time, the drain of the protection transistor T0 is connected to the initialization node N0, the gate is connected to the source, and it is equivalent to a diode having an anode connected to the initialization node N0 and a cathode connected to the second electrode. In this embodiment, the second electrode of the light-emitting element P is an anode, and the first electrode is a cathode.
As shown in fig. 6, fig. 6 is a schematic structural diagram of another display panel provided in the embodiment of the present application, and in combination with the embodiment, in the manner shown in fig. 6, the pixel circuit 11 includes a pixel transistor T; the active structure A0 of the protection transistor T0 is the same as the active structure A of the pixel transistor T in layer and material; the first pole S0 and the second pole D0 of the protection transistor T0 are the same layer and material as the first pole S and the second pole D of the pixel transistor T; the gate G0 of the protection transistor T0 is the same layer and material as the gate G of the pixel transistor T.
In the embodiment shown in fig. 6, the protection transistor T0 is the same as the pixel transistor T, and the pixel transistor T is a P-type transistor, so the protection transistor T0 is a P-type transistor. The protection transistor T0 can be synchronously manufactured while the pixel transistor T is manufactured, and when each structure of the pixel transistor T is formed, only the corresponding structure of the protection transistor T0 on the same layer needs to be additionally reserved, and no additional process step needs to be added separately, so that the method is compatible with the existing process method of the pixel circuit 11, the manufacturing process is simple, and the manufacturing cost is low.
In another mode, the selective turn-on element 12 is a diode connected between the initialization node N0 and the second electrode. In this mode, one diode is directly connected between the light-emitting element P and the pixel circuit 11, and the circuit configuration is simple as compared with the protection transistor T0.
The pixel circuit 11 includes the pixel transistor T as described above. The pixel transistor T includes an active structure including: a source region, a drain region, and a channel region between the source region and the drain region; the doping types of the source region and the drain region are the same and are different from the doping type of the channel region; the diode has a first semiconductor and a second semiconductor forming a PN junction; the first semiconductor is the same as the source region and the drain region in layer and material; the second semiconductor is the same layer and material as the channel region. In the mode, the PN junction of the diode can be manufactured while the active structure of the pixel transistor T is formed, extra independent addition of process steps is not needed, the method can be compatible with the existing process method of the pixel circuit, the manufacturing process is simple, and the manufacturing cost is low.
As shown in fig. 7, fig. 7 is a schematic diagram of a circuit structure in another display panel provided in the embodiment of the present application, based on the manner shown in fig. 1, in which a pixel circuit 11 includes a plurality of pixel transistors T and a second storage capacitor C2; the pixel transistor T includes a first transistor T1. The pixel circuit 11 is configured to generate a drive current based on at least the reference voltage VREF, the second power supply voltage E2, and the data voltage, the light emitting element emitting light based on the drive current; one of the first power voltage and the second power voltage is a fixed high potential, and the other is a fixed low potential; the electrical signal of the first signal terminal D1 is a reference voltage VREF, and is used for initializing the voltage reset of the node N0. The fixed potential V0 is a first power voltage E1, a second power voltage E2 or a reference voltage VREF. In this way, the fixed voltage signal in the pixel circuit is multiplexed as the fixed potential V0 required by the second plate of the first storage capacitor C1, and thus, it is not necessary to increase the voltage signal separately, thereby reducing the number of signal lines in the display panel and facilitating the circuit layout in the display panel.
In the circuit diagrams of the above embodiments, the pixel transistors T are all P-type transistors, and the P-type transistors are turned on when the control electrode is at a low potential. If the pass device 12 is selected to be the protection transistor T0, the protection transistor T0 is also a P-type transistor at this time, so as to be fabricated in the same process as the pixel transistor T.
When the pixel transistors T are all P-type transistors, the second electrode of the light emitting device P is an anode, the first electrode is a cathode, the first power voltage E1 is a fixed low voltage PVEE, and the second power voltage E2 is a fixed high voltage PVDD.
As shown in fig. 8, fig. 8 is a schematic structural diagram of a pixel circuit provided in the embodiment of the present application, and the pixel circuit 11 is shown in a 7T1C structure, that is, the pixel circuit 11 is formed by interconnecting 7 pixel transistors and 1 storage capacitor (i.e., the second storage capacitor C2). Obviously, in the embodiment of the present application, the pixel circuit 11 of the display panel is not limited to the 7T1C structure, and may also be other pixel circuit structures such as 2T1C or 6T1C, and is not limited to the implementation manner provided in the embodiment of the present application.
The pixel circuit 11 shown in fig. 8 includes:
a first transistor T1, a first control signal S1 being inputted to a control electrode of the first transistor T1, a reference voltage VREF being inputted to a first electrode through the first signal terminal D1, and an initialization node N0 being connected to a second electrode;
a second transistor T2, a control electrode of the second transistor T2 inputting the second control signal S2, a first electrode inputting the DATA signal DATA, a second electrode connected to the first node N1;
a third transistor T3, in which a control electrode of the third transistor T3 receives the emission signal EM, a first electrode is connected to the first node N1, and a second electrode receives the second power supply voltage E2;
a fourth transistor T4, a control electrode of the fourth transistor T4 being connected to the second node N2, a first electrode being connected to the first node N1, and a second electrode being connected to the third node N3;
a fifth transistor T5, a control electrode of the fifth transistor T5 inputting the first control signal S1, a first electrode inputting the reference voltage VREF, and a second electrode connected to the second node N2;
a second storage capacitor C2, wherein one plate of the second storage capacitor C2 is connected to the second node N2, and the other plate is inputted with a second power voltage E2;
a sixth transistor T6, a control electrode of the sixth transistor T6 inputting the second control signal S2, a first electrode connected to the second node N2, and a second electrode connected to the third node N3;
the seventh transistor T7, a control electrode of the seventh transistor T7 inputs the emission signal EM, a first electrode is connected to the initialization node N0, and a second electrode is connected to the third node N3. In the embodiment shown in fig. 8, all the pixel transistors T are P-type transistors, and the first power voltage is at the fixed low voltage PVEE, and the second power voltage E2 is at the voltage PVDD.
In the above embodiment, the pixel transistors T are all P-type transistors, and when all the pixel transistors T are all P-type transistors, the first electrode of the light-emitting element is a cathode and the second electrode is an anode. The driving current Id generated in the pixel circuit 11 sequentially passes through the second electrode and the first electrode of the subpixel P from the initialization node N0, where the second electrode is an anode and the first electrode is a cathode, so that the first power voltage needs to be the fixed low potential PVEE and the second power voltage E2 bits PVDD.
In another mode, the pixel transistors T may be all N-type transistors (NMOS), and the N-type transistors are turned on when the control voltage is high. If the protection transistor T0 is used as the selective turn-on element 12, the protection transistor T0 and the pixel transistor T are the same and are both N-type transistors, so that the same process as the pixel transistor T can be conveniently prepared.
As shown in fig. 9, fig. 9 is a schematic diagram illustrating the principle of preventing abnormal light emission when the two electrodes of the light emitting device are connected in reverse in the embodiment of the present invention, when the pixel circuit 11 is a P-type transistor, the first power voltage E1 is a fixed low voltage PVEE, and when the pixel circuit is displaying normal light emission, current flows from the pixel circuit 11 to the light emitting device P, if the two electrodes of the light emitting device P are connected in reverse as shown in fig. 9, as shown by the dotted arrow in the figure, in the non-display stage, a current flowing from the light emitting device P to the pixel circuit 11 is formed, and the current in the direction is blocked by the selective conduction device 12, so as to avoid abnormal light emission when the two electrodes of the light emitting device P are connected in reverse.
In the above embodiment, the pixel transistors T are all P-type transistors, but in other embodiments, the pixel transistors P may be all N-type transistors. When the pixel transistors T are all N-type transistors, the first electrode of the light emitting element P is an anode, and the second electrode is a cathode. At this time, the circuit diagram in the display panel may be as shown in fig. 10.
As shown in fig. 10, fig. 10 is a schematic circuit structure diagram of another display panel provided in the embodiment of the present application, in which all the pixel transistors T in the pixel circuit 11 are N-type transistors. When the pixel transistors T are all N-type transistors, the second electrode of the light emitting device P is a cathode, the first electrode is an anode, the first power voltage E1 is a fixed high voltage PVDD, and the second power voltage E2 is a fixed low voltage PVEE.
Based on the foregoing embodiment, another embodiment of the present application further provides a display device, where the display device is shown in fig. 11, fig. 11 is a schematic structural diagram of the display device provided in the embodiment of the present application, the display device includes a display panel 21, and the display panel 21 may be the display panel provided in the foregoing embodiment.
In the embodiment of the application, the display device can be a mobile phone, a tablet computer, a notebook computer or a wearable device with a display function, and the display device adopts the display panel, so that the problem of abnormal light emission of the light-emitting element due to the fact that the two electrodes are reversely connected can be avoided in a non-display stage.
The embodiments in the present description are described in a progressive manner, or in a parallel manner, or in a combination of a progressive manner and a parallel manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other. For the display device disclosed in the embodiment, since it corresponds to the display panel disclosed in the embodiment, the description is relatively simple, and the relevant points can be referred to the description of the relevant parts of the display panel.
It should be noted that in the description of the present application, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only used for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present application. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. 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 application. Thus, the present application 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 (13)
1. A display panel, comprising:
a pixel circuit for driving the light emitting element to emit light;
the pixel circuit is electrically connected with the light-emitting element through an initialization node;
the pixel circuit comprises a first transistor, wherein a first pole of the first transistor is connected to a first signal terminal, a second pole of the first transistor is electrically connected with the initialization node, a control pole of the first transistor is connected with a first control signal, and the first transistor is used for responding to the first control signal and transmitting an electric signal of the first signal terminal to the initialization node;
the light emitting element comprises a first electrode and a second electrode, the first electrode is connected with a first power supply voltage, the second electrode is connected with the initialization node through a selective conduction element, and the selective conduction element is used for enabling the light emitting element to be conducted with the initialization node in the display stage and enabling the light emitting element to be disconnected with the initialization node in the non-display stage;
and a first polar plate of the first storage capacitor is connected with the initialization node, and a second polar plate of the first storage capacitor is connected with a fixed potential.
2. The display panel according to claim 1, wherein a capacitance value of the first storage capacitor is greater than or equal to a capacitance value between the first electrode and the second electrode.
3. The display panel of claim 1, wherein the display panel has multiple conductive layers of different layers, one of the conductive layers comprising one plate of the first storage capacitor, and the other of the conductive layers comprising the other plate of the first storage capacitor.
4. The display panel according to claim 3, wherein the pixel circuit includes a second storage capacitor;
one polar plate of the first storage capacitor and one polar plate of the second storage capacitor are positioned on the same conductive layer, and the other polar plate of the first storage capacitor and the other polar plate of the second storage capacitor are positioned on the same conductive layer.
5. The circuit of claim 1, wherein the selectively conductive element is a protection transistor, a first pole of the protection transistor is connected to a control pole of the protection transistor, the first pole of the protection transistor is connected to the second pole, and the second pole of the protection transistor is connected to the initialization node.
6. The display panel according to claim 5, wherein the pixel circuit includes a pixel transistor;
the active structure of the protection transistor is the same as that of the pixel transistor in layer and material; the first pole and the second pole of the protection transistor are the same as the first pole and the second pole of the pixel transistor in layer and are made of the same material; the control electrode of the protection transistor and the control electrode of the pixel transistor are in the same layer and are made of the same material.
7. The display panel according to claim 1, wherein the selective turn-on element is a diode connected between the initialization node and the second electrode.
8. The display panel according to claim 7, wherein the pixel circuit includes a pixel transistor; the pixel transistor includes an active structure including: a source region and a drain region, and a channel region between the source region and the drain region; the doping types of the source region and the drain region are the same and are different from the doping type of the channel region;
the diode has a first semiconductor and a second semiconductor forming a PN junction; the first semiconductor is the same in layer and material as the source region and the drain region; the second semiconductor and the channel region are in the same layer and are made of the same material.
9. The display panel according to claim 1, wherein the pixel circuit includes a plurality of pixel transistors and a second storage capacitor; the pixel transistor includes the first transistor; the pixel circuit is configured to generate a drive current based on at least a reference voltage, a second power supply voltage, and a data voltage, the light emitting element emitting light based on the drive current; one of the first power voltage and the second power voltage is a fixed high potential, and the other is a fixed low potential;
wherein the fixed potential is the first power voltage, the second power voltage or the reference voltage.
10. The display panel according to claim 9, wherein the pixel transistors are P-type transistors, the first power voltage is the fixed low potential, and the second power voltage is a fixed high potential.
11. The display panel according to claim 9, wherein the pixel transistors are N-type transistors, the first power voltage is the fixed high potential, and the second power voltage is a fixed low potential.
12. The display panel according to claim 1, wherein the pixel circuit comprises:
the first transistor;
a second transistor, a control electrode of which inputs a second control signal, a first electrode of which inputs a data signal, and a second electrode of which is connected with a first node;
a third transistor having a control electrode to which a light emitting signal is input, a first electrode connected to the first node, and a second electrode to which a second power supply voltage is input;
a fourth transistor, a control electrode of which is connected with the second node, a first electrode of which is connected with the first node, and a second electrode of which is connected with the third node;
a fifth transistor, a control electrode of which inputs the first control signal, a first electrode of which inputs a reference voltage, and a second electrode of which is connected to the second node;
one polar plate of the second storage capacitor is connected with the second node, and the other polar plate of the second storage capacitor is input with the second power supply voltage;
a sixth transistor, a control electrode of which inputs the second control signal, a first electrode of which is connected to the second node, and a second electrode of which is connected to the third node;
and a seventh transistor having a control electrode to which the light emission signal is input, a first electrode connected to the initialization node, and a second electrode connected to the third node.
13. A display device characterized by comprising the display panel according to any one of claims 1 to 12.
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