CN117636807B - Display driving circuit, display driving method and display panel - Google Patents
Display driving circuit, display driving method and display panel Download PDFInfo
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Abstract
The application belongs to the technical field of display driving, and particularly relates to a display driving circuit, a display driving method and a display panel, wherein the display driving circuit comprises a threshold voltage acquisition module, a driving transistor, a data writing module, a compensation module and a light-emitting control module; collecting threshold voltage of the driving transistor in real time through a threshold voltage collecting module, and storing the collected threshold voltage in a compensation module; the threshold voltage stored in the compensation module compensates the driving current of the driving transistor when the data writing module writes the data line voltage, so that the driving current flowing through the display light-emitting module is not influenced by the threshold voltage; the application compensates the driving current of the driving transistor independently of the data signal, so that the compensation time is not limited by the scanning time, the driving current can be prevented from being fully compensated, and the problem of uneven display of the display panel is improved.
Description
Technical Field
The disclosure belongs to the technical field of display driving, and particularly relates to a display driving circuit, a display driving method and a display panel.
Background
An OLED (Organic Light-Emitting Diode) display panel has many advantages of self-luminescence, flexibility, thin thickness, high brightness, low power consumption, fast response, wide color gamut, etc., and is widely used in electronic products such as televisions, mobile phones, notebooks, etc.
Since the OLED is current driven, a stable current is required to control its light emission; due to the process and device aging, there is non-uniformity in the threshold voltage Vth of the driving transistor in the pixel circuit for driving the OLED to emit light, which causes the current flowing through the OLED to vary, so that the display brightness is not uniform, and the display effect of the whole image is deteriorated. Currently, by sensing an electrical property (such as a threshold voltage or mobility) of an element in a pixel circuit, an input data signal is modulated by a compensation device disposed outside the display panel based on a sensing result to achieve the purpose of compensating the threshold voltage.
However, the refresh rate of the OLED display panel is higher and higher, and the scanning time per frame is shorter and shorter. The data signal is used for compensating the threshold voltage, the compensation time is limited by the scanning time, and the threshold voltage cannot be sufficiently compensated, so that the problem of uneven display of the display panel is caused.
Disclosure of Invention
The application provides a display driving circuit, a display driving method and a display panel, which solve the problem of uneven display of the display panel.
In a first aspect, the application provides a display driving circuit, which comprises a threshold voltage acquisition module, a driving transistor, a data writing module, a compensation module and a light-emitting control module; the threshold voltage acquisition module is connected with the control end of the driving transistor through a first node, and is connected with the first end of the driving transistor through a second node and used for acquiring the threshold voltage of the driving transistor; the control end of the data writing module is connected with the grid control line, the first end of the data writing module is connected with the data line, and the second end of the data writing module is connected with the second node; the first end of the compensation module is connected with the control end of the driving transistor through the first node, and the second end of the compensation module is connected with the second end of the driving transistor through a third node and is used for compensating the driving current of the driving transistor according to the threshold voltage; the control end of the light-emitting control module is connected with a light-emitting control line, the first end of the light-emitting control module is connected with the third node, and the second end of the light-emitting control module is connected with the display light-emitting module.
Optionally, the threshold voltage acquisition module includes: the control end of the first switching tube is connected with the first scanning line, and the first end of the first switching tube is connected with the first power line; the control end of the second switching tube is connected with the second scanning line, the first end of the second switching tube is connected with the first node, and the second end of the second switching tube is connected with the second end of the first switching tube through the fourth node; the control end of the third switching tube is connected with a third scanning line, the first end of the third switching tube is connected with the fourth node, and the second end of the third switching tube is connected with a second power line; the control end of the fourth switching tube is connected with the first scanning line, and the first end of the fourth switching tube is connected with the first node; the control end of the fifth switching tube is connected with the fourth scanning line, the first end of the fifth switching tube is connected with the second node, and the second end of the fifth switching tube is connected with the third power line; and two ends of the first capacitor are respectively connected with the second node and the fourth node.
Optionally, the compensation module includes: the control end of the sixth switching tube is connected with a fifth scanning line, the first end of the sixth switching tube is connected with the first node, and the second end of the sixth switching tube is connected with the third node; and the first end of the second capacitor is connected with the third node, and the second end of the second capacitor is connected with a second power line.
Optionally, the display driving circuit further includes: the control end of the first discharging module is connected with the sixth scanning line, the first end of the first discharging module is connected with the second node, and the second end of the first discharging module is connected with the first power line and is used for discharging the voltage of the second node before data writing.
Optionally, the display driving circuit further includes: the control end of the second discharging module is connected with the seventh scanning line, the first end of the second discharging module is connected with the second end of the light-emitting control module through a fifth node, and the second end of the second discharging module is connected with the third power line and is used for discharging the voltage of the fifth node before data writing.
Optionally, the data writing module includes: the control end of the seventh switching tube is connected with the grid control line, the first end of the seventh switching tube is connected with the data line, and the second end of the seventh switching tube is connected with the second node; or/and, the light-emitting control module comprises: and the control end of the eighth switching tube is connected with the light-emitting control line, the first end of the eighth switching tube is connected with the third node, and the second end of the eighth switching tube is connected with the display light-emitting module.
Optionally, the first discharging module includes: the control end of the ninth switching tube is connected with a sixth scanning line, the first end of the ninth switching tube is connected with the second node, and the second end of the ninth switching tube is connected with the first power line; or/and, the second discharging module comprises: and the control end of the tenth switching tube is connected with the seventh scanning line, the first end of the tenth switching tube is connected with the second end of the light-emitting control module through a fifth node, and the second end of the tenth switching tube is connected with the third power line.
In a second aspect, the present application provides a display driving method for controlling the display driving circuit according to the above technical scheme, where the driving method includes controlling a data writing module and a light emitting control module to be turned off, turning on the threshold voltage collecting module and the compensation module, collecting a threshold voltage of a driving transistor, and storing the threshold voltage in the compensation module in a voltage collecting stage; in the data writing stage, the threshold voltage acquisition module and the light-emitting control module are controlled to be closed, the data writing module is started, the data line voltage is written into the second node, and the threshold voltage in the compensation module is used for compensating the driving current of the driving transistor; in the light-emitting stage, the threshold voltage acquisition module and the data writing module are controlled to be closed, and the light-emitting control module is started, so that the driving current output by the driving transistor drives the display light-emitting module to emit light.
Optionally, the voltage acquisition stage includes a reset sub-stage, and an acquisition sub-stage, and the controlling the data writing module and the light emitting control module to close, open the threshold voltage acquisition module and the compensation module, acquire a threshold voltage of the driving transistor, and store the threshold voltage in the compensation module, including: in the resetting sub-stage, the control data writing module and the light-emitting control module are closed, the first working state of the threshold voltage acquisition module is started, and the node voltage in the threshold voltage acquisition module is reset; in the resetting sub-stage, the data writing module and the light-emitting control module are controlled to be closed, the second working state of the threshold voltage acquisition module is started, the node voltage in the threshold voltage acquisition module is reset, and the driving transistor is controlled to be started; and in the acquisition sub-stage, the control data writing module and the light-emitting control module are closed, the third working state of the threshold voltage acquisition module and the compensation module are started, the threshold voltage of the driving transistor is acquired, and the threshold voltage is stored in a third node.
In a third aspect, the present application provides a display panel comprising: a substrate base; the display light-emitting modules are arranged on the substrate base plate at intervals along the row direction and the column direction; according to the technical scheme, the display driving circuits are connected with the display light-emitting modules in a one-to-one correspondence manner; and the grid driving modules are cascaded, the grid driving modules of each row are connected with the display driving circuits of the corresponding row through a plurality of scanning lines of the corresponding row, and the grid driving modules of the first row are connected with the driving chip.
The technical scheme provided by the application has at least the following beneficial effects:
The application collects the threshold voltage of the driving transistor in real time through the threshold voltage collection module, and stores the collected threshold voltage in the compensation module; the threshold voltage stored in the compensation module compensates the driving current of the driving transistor when the data writing module writes the data line voltage, so that the driving current flowing through the display light-emitting module is not influenced by the threshold voltage; the application compensates the driving current of the driving transistor independently of the data signal, so that the compensation time is not limited by the scanning time, the driving current can be prevented from being fully compensated, and the problem of uneven display of the display panel is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.
Fig. 1 is a schematic structural diagram of a display driving circuit according to an embodiment of the present application.
Fig. 2 is a timing diagram of a display driving circuit according to an embodiment of the application.
Fig. 3 is a schematic diagram of a display driving circuit in a reset sub-stage according to an embodiment of the present application.
Fig. 4 is a schematic diagram of a display driving circuit in a reset sub-stage according to an embodiment of the application.
Fig. 5 is a schematic diagram of a display driving circuit at a sub-acquisition stage according to an embodiment of the present application.
Fig. 6 is a schematic diagram of a display driving circuit in a first discharging sub-stage according to an embodiment of the present application.
Fig. 7 is a schematic diagram of a display driving circuit in a data writing sub-stage according to an embodiment of the application.
Fig. 8 is a schematic diagram of a display driving circuit in a second discharging sub-stage according to an embodiment of the present application.
Fig. 9 is a schematic diagram of a display driving circuit in a light emitting sub-stage according to an embodiment of the application.
Fig. 10 is a schematic flow chart of a display driving method according to an embodiment of the application.
Fig. 11 is a schematic structural diagram of a display panel according to an embodiment of the application.
Reference numerals illustrate:
100. a display driving circuit;
110. A threshold voltage acquisition module; 120. a data writing module; 130. a compensation module; 140. a light emission control module; 150. a first discharge module; 160. a second discharge module;
M0, a driving transistor; m1, a first switching tube; m2, a second switching tube; m3, a third switching tube; m4, a fourth switching tube; m5, a fifth switching tube; m6, a sixth switching tube; m7, a seventh switching tube; m8, an eighth switching tube; m9, a ninth switching tube; m10, a tenth switching tube; c1, a first capacitor; c2, a second capacitor;
200. A display light emitting module; 300. a gate driving module; 400. a substrate.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the application may be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the application.
The application will be described in further detail with reference to the drawings and the specific examples. It should be noted that the technical features of the embodiments of the present application described below may be combined with each other as long as they do not collide with each other. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
In a first aspect, the present application provides a display driving circuit, specifically including the following embodiments:
Fig. 1 is a schematic structural diagram of a display driving circuit according to an embodiment of the present application; as shown in fig. 1, the display driving circuit 100 specifically includes:
the driving circuit comprises a threshold voltage acquisition module 110, a driving transistor M0, a data writing module 120, a compensation module 130 and a light emitting control module 140;
The threshold voltage acquisition module 110 is connected with the control end of the driving transistor M0 through a first node N1, and the threshold voltage acquisition module 110 is connected with the first end of the driving transistor M0 through a second node N2, and is used for acquiring the threshold voltage of the driving transistor M0;
The control end of the data writing module 120 is connected with a Gate control line Gate, the first end of the data writing module 120 is connected with a data line, and the second end of the data writing module 120 is connected with the second node N2;
A first end of the compensation module 130 is connected to the control end of the driving transistor M0 through the first node N1, and a second end of the compensation module 130 is connected to the second end of the driving transistor M0 through a third node N3, for compensating the driving current of the driving transistor M0 according to the threshold voltage;
The control end of the light emitting control module 140 is connected to the light emitting control line EM, the first end of the light emitting control module 140 is connected to the third node N3, and the second end of the light emitting control module 140 is connected to the display light emitting module 200.
In this embodiment, the driving transistor M0 may be a P-type thin film transistor, and the control terminal, the first terminal and the second terminal of the driving transistor M0 may be a gate, a source and a drain thereof, respectively; the data line in the present application corresponds to the output data line voltage Vdata.
Referring to the timing chart shown in fig. 2, the operation principle of the display driving circuit 100 provided in this embodiment is as follows: in the voltage acquisition phase T1, the control data writing module 120 and the light emission control module 140 are turned off, and the threshold voltage acquisition module 110 and the compensation module 130 are turned on, so that the threshold voltage of the driving transistor M0 can be acquired in real time, and the acquired threshold voltage is stored in the third node N3 of the compensation module 130; in the data writing stage T2, the threshold voltage acquisition module 110 and the light emission control module are controlled to be turned off, the data writing module 120 is turned on, the data line voltage Vdata is written into the second node N2, and the threshold voltage in the compensation module compensates the driving current of the driving transistor M0, so that the current flowing through the display light emitting module 200 is not affected by the threshold voltage; in the light emitting stage T3, the threshold voltage acquisition module 110 and the data writing module 120 are controlled to be turned off, and the light emitting control module 140 is turned on, so that the driving current output by the driving transistor M0 drives the display light emitting module 200 to emit light.
Therefore, the threshold voltage acquisition module acquires the threshold voltage of the driving transistor in real time, and stores the acquired threshold voltage in the compensation module; the threshold voltage stored in the compensation module compensates the driving current of the driving transistor when the data writing module writes the data line voltage, so that the driving current flowing through the display light-emitting module is not influenced by the threshold voltage; the application compensates the driving current of the driving transistor independently of the data signal, so that the compensation time is not limited by the scanning time, the driving current can be prevented from being fully compensated, and the problem of uneven display of the display panel is improved.
In one embodiment of the present application, the threshold voltage acquisition module 110 includes: the control end of the first switching tube M1 is connected with the first scanning line Scan1, and the first end of the first switching tube M1 is connected with the first power line; the control end of the second switching tube M2 is connected with the second scanning line Scan2, the first end of the second switching tube M2 is connected with the first node N1, and the second end of the second switching tube M2 is connected with the second end of the first switching tube M1 through a fourth node N4; the control end of the third switching tube M3 is connected with a third scanning line Scan3, the first end of the third switching tube M3 is connected with the fourth node N4, and the second end of the third switching tube M3 is connected with a second power line; the control end of the fourth switching tube M4 is connected with the first scanning line Scan1, and the first end of the fourth switching tube M4 is connected with the first node N1; a control end of the fifth switching tube M5 is connected to the fourth Scan line Scan4, a first end of the fifth switching tube M5 is connected to the second node N2, and a second end of the fifth switching tube M5 is connected to a third power line; and two ends of the first capacitor C1 are respectively connected with the second node N2 and the fourth node N4. The first power line in this embodiment correspondingly outputs a first power line voltage Vref1, the second power line correspondingly outputs a second power line voltage Vref2, the third power line correspondingly outputs a third power line voltage Vref3, and the fourth power line correspondingly outputs a fourth power line voltage Vref4.
It should be noted that, the voltage collecting stage T1 includes a reset sub-stage T11, a reset sub-stage T12, and a collecting sub-stage T13, and the threshold voltage collecting module 110 includes a first working state, a second working state, and a third working state, where the reset sub-stage T11 corresponds to the first working state, the reset sub-stage T12 corresponds to the second working state, and the collecting sub-stage T13 corresponds to the third working state; each of the operating states of the threshold voltage acquisition module 110 is described in the following:
(1) As shown in fig. 3, in the reset sub-stage T11, the first Scan line Scan1 and the second Scan line Scan2 output high levels, and the first switching tube M1, the second switching tube M2, and the fourth switching tube M4 are turned on; the third Scan line Scan3 and the fourth Scan line Scan4 output low level, and the third switch tube M3 and the fifth switch tube M5 are turned off; thereby, the voltages of the fourth node N4 and the second node N2 at both ends of the first capacitor C1 are reset to the first power line voltage Vref1, that is, the first working state of the threshold voltage collecting module 110 is set.
(2) As shown in fig. 4, in the reset sub-stage T12, the second Scan line Scan2 and the third Scan line Scan3 output a high level, the second switch tube M2 and the third switch tube M3 are turned on, so that the voltage of the fourth node N4 is reset from the first power line voltage Vref1 to the second power line voltage Vref2, and since the control terminal of the driving transistor M0 is connected to the fourth node N4 through the first node N1, the voltage of the control terminal of the driving transistor M0 is the second power line voltage Vref2, and the voltage of the first terminal of the driving transistor M0 is the reset voltage of the second node N2, that is, the first power line voltage Vref1; since Vref2 is smaller than Vref1, the driving transistor M0 is turned on, that is, the threshold voltage collecting module 110 is in the second operating state.
(3) As shown in fig. 5, in the acquisition sub-stage T13, the fourth Scan line Scan4 and the fifth Scan line Scan5 output a high level, the fifth switch transistor M5 and the sixth switch transistor M6 are turned on, the second node N2 is the third power line voltage Vref3, and the driving transistor M0 is also in the on state, so the second node N2 charges the third node N3 through the driving transistor M0, since the sixth switch transistor M6 is in the on state, the voltage of the third node N3 is equal to the gate voltage of the driving transistor M0, and when N3-N2-vth=0 (i.e., n3=vgs=vref 3+vth), the driving transistor M0 is turned off, and the acquired threshold voltage is stored in the third node N3; i.e., a third operating state in which the threshold voltage acquisition module 110 is placed. The relationship between the three power line voltages in this embodiment is: vref2 < Vref1 < Vref3.
In one embodiment of the present application, the compensation module 130 includes: a sixth switching tube M6, wherein a control end of the sixth switching tube M6 is connected to a fifth Scan line Scan5, a first end of the sixth switching tube M6 is connected to the first node N1, and a second end of the sixth switching tube M6 is connected to the third node N3; and a second capacitor C2, wherein a first end of the second capacitor C2 is connected with the third node N3, and a second end of the second capacitor C2 is connected with a second power line.
In one embodiment of the present application, the display driving circuit 100 further includes: the control end of the first discharging module 150 is connected to the sixth Scan line Scan6, the first end of the first discharging module 150 is connected to the second node N2, and the second end of the first discharging module 150 is connected to the first power line, so as to discharge the voltage of the second node N2 before writing data.
Wherein the first discharging module 150 includes: and a control end of the ninth switching tube M9 is connected with the sixth Scan line Scan6, a first end of the ninth switching tube M9 is connected with the second node N2, and a second end of the ninth switching tube M9 is connected with the first power line.
In one embodiment of the present application, the data writing module 120 includes: a seventh switching tube M7, wherein a control end of the seventh switching tube M7 is connected with the Gate control line Gate, a first end of the seventh switching tube M7 is connected with the data line, and a second end of the seventh switching tube M7 is connected with the second node N2;
it should be noted that, the data writing stage T2 in the present embodiment may include a first discharging sub-stage T21 and a data writing sub-stage T22, and the specific working principle is as follows:
(1) As shown in fig. 6, in the first discharging sub-stage T21, the sixth Scan line Scan6 and the seventh Scan line Scan7 output high levels, the ninth switching transistor M9 and the tenth switching transistor M10 are turned on, and at this time, the second node N2 voltage is discharged through the ninth switching transistor M9, and the fifth node N5 voltage is discharged through the tenth switching transistor M10.
(2) As shown in fig. 7, in the data writing sub-stage T22, the Gate control line Gate outputs a high level, the seventh switching transistor M7 is turned on, the driving transistor M0 is turned on after the data line voltage Vdata is written into the second node N2, at this time, the driving current id=k (Vgs-Vth-Vdata) 2 in the driving transistor, and n3=vgs=vref 2+vth, so id=k (Vref 2-Vdata) 2; it can be seen that the driving current has no relation to the threshold voltage, so the threshold voltage stored in the third node N3 completes the compensation of the driving current.
In one embodiment of the present application, the display driving circuit 100 further includes: the control end of the second discharging module 160 is connected to the seventh Scan line Scan7, the first end of the second discharging module 160 is connected to the second end of the light emitting control module 140 through a fifth node N5, and the second end of the second discharging module 160 is connected to the third power line, so as to discharge the voltage of the fifth node N5 before writing data.
In one embodiment of the present application, the light emission control module 140 includes: and an eighth switching tube M8, wherein a control end of the eighth switching tube M8 is connected with the light emitting control line EM, a first end of the eighth switching tube M8 is connected with the third node N3, and a second end of the eighth switching tube M8 is connected with the display light emitting module 200.
In one embodiment of the present application, the second discharging module 160 includes: and a tenth switching tube M10, wherein a control end of the tenth switching tube M10 is connected to the seventh Scan line Scan7, a first end of the tenth switching tube M10 is connected to the second end of the light emitting control module 140 through a fifth node N5, and a second end of the tenth switching tube M10 is connected to the third power line.
It should be noted that, the light emitting stage T3 in the present embodiment may include a second discharge sub-stage T31 and a light emitting sub-stage T32, and the specific working principle is as follows:
(1) As shown in fig. 8, in the second discharging sub-stage T31, the seventh Scan line Scan7 outputs a high level, and the tenth switching tube M10 is turned on, and at this time, the fifth node N5 voltage is discharged again.
(2) As shown in fig. 9, in the light emitting sub-stage T32, the light emission control line EM outputs a high level, and the eighth switching tube M8 is turned on, at this time, the display light emitting module 200 is driven to emit light by the driving current.
It should be noted that, in the present application, the first switching tube M1, the second switching tube M2, the third switching tube M3, the fourth switching tube M4, the fifth switching tube M5, the sixth switching tube M6, the seventh switching tube M7, the eighth switching tube M8, the ninth switching tube M9, and the tenth switching tube M10 may be N-type thin film transistors, and the control end, the first end, and the second end of each switching tube may be a gate electrode, a source electrode, and a drain electrode, respectively, or may correspond to the drain electrode and the source electrode, respectively, according to the actual application scenario.
Example two
In a second aspect, the present embodiment provides a display driving method for controlling the display driving circuit 100 of the above embodiment, as shown in fig. 10, the driving method specifically including the steps of:
step S100, in the voltage acquisition phase T1, the control data writing module 120 and the light emitting control module 140 are turned off, the threshold voltage acquisition module 110 and the compensation module 130 are turned on, the threshold voltage of the driving transistor M0 is acquired, and the threshold voltage is stored in the compensation module 130;
Step 200, in the data writing stage T2, the threshold voltage acquisition module 110 and the light emitting control module are controlled to be turned off, the data writing module 120 is turned on, the data line voltage Vdata is written into the second node N2, and the threshold voltage in the compensation module is made to compensate the driving current of the driving transistor;
In the step S300, in the light emitting stage T3, the threshold voltage acquisition module 110 and the data writing module 120 are controlled to be turned off, and the light emitting control module 140 is turned on, so that the driving current output by the driving transistor M0 drives the display light emitting module 200 to emit light.
In one embodiment of the present application, the voltage acquisition phase T1 includes a reset sub-phase T11, a reset sub-phase T12, and an acquisition sub-phase T13; in the voltage acquisition phase T1, the control data writing module 120 and the light emission control module 140 are turned off, the threshold voltage acquisition module 110 and the compensation module 130 are turned on, the threshold voltage of the driving transistor M0 is acquired, and the threshold voltage is stored in the compensation module 130, which specifically includes:
in the resetting sub-stage T11, the control data writing module 120 and the light emitting control module 140 are turned off, the first working state of the threshold voltage acquisition module 110 is turned on, and the node voltage in the threshold voltage acquisition module 110 is reset;
In the resetting sub-stage T12, the control data writing module 120 and the light emitting control module 140 are turned off, the second working state of the threshold voltage acquisition module 110 is turned on, the node voltage in the threshold voltage acquisition module 110 is reset, and the driving transistor M0 is controlled to be turned on;
In the collecting sub-stage T13, the control data writing module 120 and the light emission control module 140 are turned off, the third operating state of the threshold voltage collecting module 110 and the compensating module 130 are turned on, the threshold voltage of the driving transistor M0 is collected, and the threshold voltage is stored in the third node N3.
It should be noted that, the working principle of the present embodiment is the same as that of the first embodiment, and will not be described here again.
Example III
As shown in fig. 11, the present embodiment provides a display panel, the display panel including:
a substrate 400;
A display light emitting module 200, wherein a plurality of the display light emitting modules 200 are arranged on the substrate base 400 at intervals along a row direction and a column direction; wherein the display light emitting module 200 includes an organic light emitting diode.
The display driving circuit 100 according to the first embodiment is connected to the display light emitting module 200 in a one-to-one correspondence manner;
The gate driving modules 300 are cascaded, the gate driving modules 300 of each row are connected with the display driving circuits 100 of the corresponding row through a plurality of scanning lines of the corresponding row, and the gate driving modules 300 of the first row are connected with a driving chip; the gate driving module 300300 may include a GOA (GATE DRIVER on array, array substrate row driving) circuit; the plurality of Scan lines in the present embodiment includes at least 7 Scan lines corresponding to the first Scan line Scan1, the second Scan line Scan2, the third Scan line Scan3, the fourth Scan line Scan4, the fifth Scan line Scan5, the sixth Scan line Scan6, and the seventh Scan line Scan7 (not fully shown in fig. 11) in the first embodiment, respectively.
When the display panel works, after the driving chip sends initial driving signals to the first gate driving modules 300, the cascaded gate driving modules 300 sequentially provide driving signals of the next gate driving module 300 by the previous gate driving module 300, so that scanning driving of all the gate driving modules 300 is realized.
It should be noted that the operation principle of the display driving circuit 100 in this embodiment is the same as that of the first embodiment, and will not be described again here.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", or a third "may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present specification, reference to the terms "some embodiments," "exemplary," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present application have been shown and described, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made in the above embodiments by those skilled in the art within the scope of the application, which is therefore intended to be covered by the appended claims and their equivalents.
Claims (9)
1. A display driving circuit, characterized in that the display driving circuit comprises:
the device comprises a threshold voltage acquisition module, a driving transistor, a data writing module, a compensation module and a light-emitting control module;
the threshold voltage acquisition module is connected with the control end of the driving transistor through a first node, and is connected with the first end of the driving transistor through a second node and used for acquiring the threshold voltage of the driving transistor;
The control end of the data writing module is connected with the grid control line, the first end of the data writing module is connected with the data line, and the second end of the data writing module is connected with the second node;
The first end of the compensation module is connected with the control end of the driving transistor through the first node, and the second end of the compensation module is connected with the second end of the driving transistor through a third node and is used for compensating the driving current of the driving transistor according to the threshold voltage;
The control end of the light-emitting control module is connected with a light-emitting control line, the first end of the light-emitting control module is connected with the third node, and the second end of the light-emitting control module is connected with the display light-emitting module;
Wherein, threshold voltage collection module includes:
the control end of the first switching tube is connected with the first scanning line, and the first end of the first switching tube is connected with the first power line;
The control end of the second switching tube is connected with the second scanning line, the first end of the second switching tube is connected with the first node, and the second end of the second switching tube is connected with the second end of the first switching tube through the fourth node;
the control end of the third switching tube is connected with a third scanning line, the first end of the third switching tube is connected with the fourth node, and the second end of the third switching tube is connected with a second power line;
The control end of the fourth switching tube is connected with the first scanning line, and the first end of the fourth switching tube is connected with the first node;
The control end of the fifth switching tube is connected with the fourth scanning line, the first end of the fifth switching tube is connected with the second node, and the second end of the fifth switching tube is connected with the third power line;
and two ends of the first capacitor are respectively connected with the second node and the fourth node.
2. The display driver circuit of claim 1, wherein the compensation module comprises:
The control end of the sixth switching tube is connected with a fifth scanning line, the first end of the sixth switching tube is connected with the first node, and the second end of the sixth switching tube is connected with the third node;
And the first end of the second capacitor is connected with the third node, and the second end of the second capacitor is connected with a second power line.
3. The display driver circuit according to claim 1, wherein the display driver circuit further comprises:
the control end of the first discharging module is connected with the sixth scanning line, the first end of the first discharging module is connected with the second node, and the second end of the first discharging module is connected with the first power line and is used for discharging the voltage of the second node before data writing.
4. A display driver circuit according to claim 3, wherein the display driver circuit further comprises:
The control end of the second discharging module is connected with the seventh scanning line, the first end of the second discharging module is connected with the second end of the light-emitting control module through a fifth node, and the second end of the second discharging module is connected with a third power line and is used for discharging the voltage of the fifth node before data writing.
5. The display driver circuit of claim 2, wherein the data writing module comprises: the control end of the seventh switching tube is connected with the grid control line, the first end of the seventh switching tube is connected with the data line, and the second end of the seventh switching tube is connected with the second node;
or/and, the light-emitting control module comprises: and the control end of the eighth switching tube is connected with the light-emitting control line, the first end of the eighth switching tube is connected with the third node, and the second end of the eighth switching tube is connected with the display light-emitting module.
6. The display driver circuit of claim 4, wherein the first discharge module comprises: the control end of the ninth switching tube is connected with a sixth scanning line, the first end of the ninth switching tube is connected with the second node, and the second end of the ninth switching tube is connected with the first power line;
Or/and, the second discharging module comprises: and the control end of the tenth switching tube is connected with the seventh scanning line, the first end of the tenth switching tube is connected with the second end of the light-emitting control module through a fifth node, and the second end of the tenth switching tube is connected with the third power line.
7. A display driving method for controlling the display driving circuit according to any one of claims 1 to 6, the driving method comprising:
in the voltage acquisition stage, the control data writing module and the light-emitting control module are closed, the threshold voltage acquisition module and the compensation module are opened, the threshold voltage of the driving transistor is acquired, and the threshold voltage is stored in the compensation module;
in the data writing stage, the threshold voltage acquisition module and the light-emitting control module are controlled to be closed, the data writing module is started, the data line voltage is written into the second node, and the threshold voltage in the compensation module is used for compensating the driving current of the driving transistor;
In the light-emitting stage, the threshold voltage acquisition module and the data writing module are controlled to be closed, and the light-emitting control module is started, so that the driving current output by the driving transistor drives the display light-emitting module to emit light.
8. The display driving method according to claim 7, wherein the voltage acquisition stage includes a reset sub-stage, and an acquisition sub-stage, controlling the data writing module and the light emission control module to be turned off, turning on the threshold voltage acquisition module and the compensation module, acquiring a threshold voltage of a driving transistor, and storing the threshold voltage in the compensation module, comprises:
in the resetting sub-stage, the control data writing module and the light-emitting control module are closed, the first working state of the threshold voltage acquisition module is started, and the node voltage in the threshold voltage acquisition module is reset;
In the resetting sub-stage, the data writing module and the light-emitting control module are controlled to be closed, the second working state of the threshold voltage acquisition module is started, the node voltage in the threshold voltage acquisition module is reset, and the driving transistor is controlled to be started;
And in the acquisition sub-stage, the control data writing module and the light-emitting control module are closed, the third working state of the threshold voltage acquisition module and the compensation module are started, the threshold voltage of the driving transistor is acquired, and the threshold voltage is stored in a third node.
9. A display panel, comprising:
A substrate base;
The display light-emitting modules are arranged on the substrate base plate at intervals along the row direction and the column direction;
The display driving circuit according to any one of claims 1 to 6, wherein the display driving circuit is connected with the display light emitting modules in a one-to-one correspondence;
And the grid driving modules are cascaded, the grid driving modules of each row are connected with the display driving circuits of the corresponding row through a plurality of scanning lines of the corresponding row, and the grid driving modules of the first row are connected with the driving chip.
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| CN113487996B (en) * | 2021-07-22 | 2024-07-05 | 上海闻泰信息技术有限公司 | Pixel driving circuit, display panel and display device |
| CN114333702B (en) * | 2022-03-03 | 2022-05-31 | 惠科股份有限公司 | Display panel and driving circuit thereof |
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