Display panel, driving method thereof and display device

Abstract

The invention discloses a display panel, a driving method thereof and a display device. In the display panel, a storage driving module is connected between a light-emitting device and a first power line, a first switch module is connected between a first data line and a first control end of the storage driving module, and a second switch module is connected between a second data line and a second control end of the storage driving module; the storage driving module stores image display information according to a first voltage transmitted by the first power line and a first data voltage transmitted by the first data line, and outputs a driving current according to the first voltage transmitted by the first power line and a second data voltage transmitted by the second data line so as to drive the light emitting device to emit light. According to the embodiment of the invention, the stability of the display panel can be improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a driving method thereof, and a display device. Background Art

[0002] In the prior art, electronic tags are mostly realized by liquid crystal or electronic ink display technology. However, the thickness of liquid crystal display tags is relatively thick and does not have dynamic bending characteristics, the display color effect of electronic ink is poor, and passive light sources need to be added to achieve visibility, and the display color effect of electronic tags prepared under the above display technologies is poor. Summary of the invention

[0003] The embodiments of the present application provide a display panel and a driving method thereof, and a display device, which can improve the stability of the display panel.

[0004] In a first aspect, an embodiment of the present application provides a display panel, comprising: a substrate; a sub-pixel, located on the substrate, the sub-pixel comprising a pixel circuit and a light-emitting device, the pixel circuit comprising a first switch module, a second switch module and a storage driver module; the storage driver module is connected between the light-emitting device and a first power line, the first switch module is connected between the first data line and a first control end of the storage driver module, and the second switch module is connected between the second data line and a second control end of the storage driver module; the first switch module is used to respond to the scanning signal on the first scanning line to be turned on, and transmit the voltage on the first data line to the first control end, and the second switch module is used to respond to the scanning signal on the second scanning line to be turned on, and transmit the voltage on the second data line to the second control end; the storage driver module stores image display information according to the first voltage transmitted by the first power line and the first data voltage transmitted by the first data line, and outputs a driving current according to the first voltage transmitted by the first power line and the second data voltage transmitted by the second data line to drive the light-emitting device to emit light.

[0005] In a possible embodiment of the first aspect, the storage drive module includes a first transistor, the first transistor includes a first gate and a second gate, the first gate is a first control end, the second gate is a second control end, the first electrode of the first transistor is electrically connected to the first power line, and the second electrode of the first transistor is electrically connected to the light-emitting device.

[0006] In a possible embodiment of the first aspect, in a thickness direction of the display panel, an active layer of the first transistor is spaced between the first gate and the second gate.

[0007] In a possible embodiment of the first aspect, in a thickness direction of the display panel, the first gate is located on a side of the active layer of the first transistor away from the substrate, and the second gate is located on a side of the active layer of the first transistor close to the substrate;

[0008] Alternatively, in the thickness direction of the display panel, the first gate is located on a side of the active layer of the first transistor close to the substrate, and the second gate is located on a side of the active layer of the first transistor away from the substrate;

[0009] Preferably, a first insulating layer is provided between the first gate and the active layer of the first transistor, and a second insulating layer is provided between the second gate and the active layer of the first transistor;

[0010] The first insulating layer includes a silicon nitride layer, a silicon oxide layer, or a stacked structure of silicon nitride and silicon oxide;

[0011] Preferably, on the side away from the substrate, the first insulating layer includes silicon oxide, silicon nitride and silicon oxide stacked in sequence.

[0012] In a possible embodiment of the first aspect, the first switch module includes a second transistor, a gate of the second transistor is electrically connected to the first scan line, a first electrode of the second transistor is electrically connected to the first data line, and a second electrode of the second transistor is electrically connected to the first control end;

[0013] Preferably, the second switch module includes a third transistor, a gate of the third transistor is electrically connected to the second scan line, a first electrode of the third transistor is electrically connected to the second data line, and a second electrode of the third transistor is electrically connected to the second control terminal.

[0014] In a possible embodiment of the first aspect, the sub-pixel includes m pixel circuits, and the m pixel circuits are connected in parallel between the first power line and the light-emitting device, where m is an integer greater than 1.

[0015] In a possible embodiment of the first aspect, the first control terminals of at least two storage driving modules in the same sub-pixel are connected to different voltages from the first data line.

[0016] Based on the same inventive concept, in a second aspect, an embodiment of the present application provides a method for driving a display panel, which is used to drive the display panel as described in any embodiment of the first aspect;

[0017] The drive methods include:

[0018] In the information storage stage, a first voltage is transmitted to the first power line; a scanning signal is transmitted to the first scanning line to control the first switch module to be turned on; and when the first switch module is turned on, a first data voltage is transmitted to the first data line, so that each storage driving module stores image display information according to the first voltage and the first data voltage;

[0019] In the display stage, a first voltage is transmitted to the first power line; a scan signal is transmitted to the second scan line to control the second switch module to be turned on; and when the second switch module is turned on, a second data voltage is transmitted to the second data line, so that each storage drive module outputs a drive current according to the first voltage and the second data voltage to drive the light-emitting device to emit light.

[0020] In a possible embodiment of the second aspect, the driving method further includes:

[0021] In the information storage stage, a scanning signal is transmitted to the second scanning line to control the second switch module to be turned on, and when the second switch module is turned on, a first voltage is transmitted to the second data line;

[0022] Preferably, in the display stage, a scan signal is transmitted to the first scan line to control the first switch module to be turned on, and when the first switch module is turned on, a second voltage is transmitted to the first data line;

[0023] The absolute value of the difference between the second voltage and the first voltage is smaller than the absolute value of the erasing voltage, and under the erasing voltage, the image display information stored in the storage driving module is erased;

[0024] Preferably, the scan signals transmitted to the first scan line and the second scan line in the display stage are both direct current signals.

[0025] Based on the same inventive concept, in a third aspect, an embodiment of the present application provides a display device, including a driving device and a display panel as described in any embodiment of the first aspect;

[0026] The drive unit includes:

[0027] A scan driving module, used for providing a scan signal to a first scan line and a second scan line of the display panel;

[0028] A power module, used for providing a first voltage to a first power line of the display panel;

[0029] The data voltage providing module is used for providing data voltage to the first data line and the second data line of the display panel.

[0030] Preferably, the driving device is detachably connected to the display panel.

[0031] According to an embodiment of the present application, the storage driver module includes two control terminals, one of which is used to control the storage function, and the other is used to control the drive function. That is to say, storage and drive are controlled separately using different control terminals to avoid mutual influence between the two, so that the storage driver module can take into account storage and drive at the same time, which can improve the stability of the storage driver module and thus improve the reliability of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Other features, objects and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals represent the same or similar features and the accompanying drawings are not drawn to scale.

[0033] Figure 1 A schematic diagram showing the structure of a display panel provided in an embodiment of the present application is shown;

[0034] Figure 2 A schematic diagram showing a module of a sub-pixel in a display panel provided by an embodiment of the present application;

[0035] Figure 3 A schematic diagram showing a driving timing sequence of a sub-pixel in a display panel provided by an embodiment of the present application is shown;

[0036] Figure 4 A driving timing diagram of a display panel provided by an embodiment of the present application is shown;

[0037] Figure 5 A schematic diagram showing a circuit structure of a sub-pixel in a display panel provided by an embodiment of the present application is shown;

[0038] Figure 6 A schematic diagram showing a cross-sectional structure of a sub-pixel in a display panel provided by an embodiment of the present application;

[0039] Figure 7 Another schematic diagram of a cross-sectional structure of a sub-pixel in a display panel provided by an embodiment of the present application is shown;

[0040] Figure 8 A characteristic diagram of a first transistor in a display panel provided by an embodiment of the present application is shown;

[0041] Fig. 9 Another schematic diagram of a circuit structure of a sub-pixel in a display panel provided by an embodiment of the present application is shown;

[0042] Fig.10 A schematic diagram showing a flow chart of a method for driving a display panel provided in an embodiment of the present application;

[0043] Fig.11 A schematic diagram of the structure of a display device provided in an embodiment of the present application is shown.

[0044] Description of reference numerals:

[0045] 100. Display panel;

[0046] 10. Substrate;

[0047] 20. Sub-pixel;

[0048] 21. Pixel circuit;

[0049] 211, first switch module; 212, second switch module; 213, storage drive module;

[0050] 22. Light-emitting device;

[0051] 31. first data line; 32. second data line;

[0052] Lvdd, first power line;

[0053] Lvss, second power line;

[0054] 41. First scanning line;

[0055] 42. Second scanning line;

[0056] 51. a first insulating layer; 52. a second insulating layer;

[0057] 200, driving device;

[0058] 210, scanning driving module; 220, power supply module; 230, data voltage providing module. DETAILED DESCRIPTION

[0059] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present application and are not configured to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0060] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0061] It should be understood that when describing the structure of a component, when a layer or a region is referred to as being "on" or "over" another layer or another region, it may mean that it is directly on the other layer or another region, or that other layers or regions are included between it and the other layer or another region. Moreover, if the component is turned over, the layer or a region will be "below" or "beneath" another layer or another region.

[0062] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0063] It should be noted that, when an element is described as being “connected” or “electrically connected” to another element, it may be directly connected to the other element, or one or more intervening elements may exist therebetween.

[0064] It is obvious to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit or scope of the present application. Therefore, the present application is intended to cover modifications and changes of the present application that fall within the scope of the corresponding claims (technical solutions for protection) and their equivalents. It should be noted that the implementation methods provided in the embodiments of the present application can be combined with each other without contradiction.

[0065] As introduced in the background technology, electronic tags realized by liquid crystal or electronic ink display technology have the problem of poor display color effect. However, OLED (Organic Light-Emitting Device) display technology, especially AMOLED (Active-Matrix Organic Light Emitting Diode) display technology, has the advantages of excellent color display effect and bendability, and has become the mainstream display technology. Applying OLED display technology to low-cost electronic tag display can achieve bright colors and bendable display at the same time, and no external light source is required, which will greatly improve the display effect of electronic tags.

[0066] However, when the OLED display technology is applied to electronic tags in the related art, there is still a problem of poor stability.

[0067] To solve the above technical problems, the embodiments of the present application provide a display panel and a driving method thereof, and a display device, and the embodiments will be described below in conjunction with the accompanying drawings. Exemplarily, the display panel includes an electronic label.

[0068] like Figure 1 As shown, the display panel 100 provided in the embodiment of the present application includes a substrate 10 and a sub-pixel 20. The sub-pixel 20 is located on the substrate 10.

[0069] Figure 1 exemplarily shows that the display panel 100 includes i*j (i row and j column) sub-pixels 20. The substrate 10 is also provided with a first power line Lvdd, a second power line Lvss, a first data line 31, a second data line 32, a first scan line 41 and a second scan line 42 to drive the sub-pixels 20 to emit light and display a picture. Exemplarily, along the top-to-bottom direction, the first power line Lvdd1 in the first row to the first power line Lvddi in the i-th row are respectively connected to the sub-pixels 20 in the first row to the sub-pixels 20 in the i-th row, the second power line Lvss1 in the first row to the second power line Lvssi in the i-th row are respectively connected to the sub-pixels 20 in the first row to the sub-pixels 20 in the i-th row, and the first scan line 41_1 in the first row to the first scan line 41_i in the i-th row are respectively connected to the sub-pixels 20 in the first row to the sub-pixels 20 in the i-th row. 20, the 1st row second scan line 42_1 to the i-th row second scan line 42_i are respectively connected to the 1st row sub-pixel 20 to the i-th row sub-pixel 20, and, along the left to right direction, the 1st column first data line 31_1 to the j-th column first data line 31_j are respectively connected to the 1st column sub-pixel 20 to the j-th column sub-pixel 20, and the 1st column second data line 32_1 to the j-th column second data line 32_j are respectively connected to the 1st column sub-pixel 20 to the j-th column sub-pixel 20.

[0070] Exemplarily, the specific structures of the sub-pixels 20 may be the same. Figure 1 The structure of the sub-pixel 20 in the first row and the first column is given as an example. Specifically, the sub-pixel 20 includes a pixel circuit 21 and a light emitting device 22, and the pixel circuit 21 is used to drive the light emitting device 22 to emit light.

[0071] The pixel circuit 21 includes a first switch module 211 , a second switch module 212 and a storage driving module 213 .

[0072] The storage driving module 213 is connected between the light emitting device 22 and the first power line Lvdd, the first switch module 211 is connected between the first data line 31 and the first control end of the storage driving module 213, and the second switch module 212 is connected between the second data line 32 and the second control end of the storage driving module 213; the first switch module 211 is used to transmit the voltage on the first data line 31 to the first control end of the storage driving module 213 in response to the scanning signal on the first scanning line 41, and the second switch module 212 is used to transmit the voltage on the second data line 32 to the second control end of the storage driving module 213 in response to the scanning signal on the second scanning line 42. The storage driving module 213 is used to store image display information according to the first voltage transmitted by the first power line Lvdd and the first data voltage transmitted by the first data line 31, and output a driving current according to the first voltage transmitted by the first power line Lvdd and the second data voltage transmitted by the second data line 32, so as to drive the light emitting device 22 to emit light, and the driving current is associated with the image display information.

[0073] Figure 2 A schematic diagram of the structure of a sub-pixel in a display panel provided by an embodiment of the present application is shown. Figure 1 and Figure 2 The connection method of the sub-pixel 20 can be: the control end of the first switch module 211 is electrically connected to the first scan line 41 and connected to the first scan signal SCAN1; the first end of the first switch module 211 is electrically connected to the first data line 31 and connected to the first data signal VDATA1; the second end of the first switch module 211 is electrically connected to the first control end of the storage driver module 213.

[0074] The control end of the second switch module 212 is electrically connected to the second scan line 42 and receives the second scan signal SCAN2; the first end of the second switch module 212 is electrically connected to the second data line 32 and receives the second data signal VDATA2; the second end of the second switch module 212 is electrically connected to the second control end of the storage driver module 213.

[0075] The first end of the storage driving module 213 is electrically connected to the first power line Lvdd, and is connected to the first power signal VDD. The second end of the storage driving module 213 is electrically connected to the first electrode of the light emitting device 22. The second electrode of the light emitting device 22 is electrically connected to the second power line Lvss, and is connected to the second power signal VSS. The light emitting device 22 may be a current-driven organic light emitting diode.

[0076] The inventors have found that, for a transistor device with storage and driving functions, if its storage and driving are controlled by the same control terminal, writing and erasing need to rely on the voltage change of the data signal. When writing a state, since the transistor is a storage-type structure with a single control terminal, the threshold voltage of the transistor is easily offset under the gate voltage, resulting in poor stability of the transistor device with storage and driving functions.

[0077] According to the display panel provided in the embodiment of the present application, the storage driver module includes two control terminals, one of which is used to control the storage function, and the other is used to control the drive function. That is to say, storage and drive are controlled separately using different control terminals to avoid mutual influence between the two, so that the storage driver module can take into account storage and drive at the same time, which can improve the stability of the storage driver module and thus improve the reliability of the display panel.

[0078] Next, the driving process of one sub-pixel 20 is first described, and then the driving process of the display panel is described.

[0079] Figure 3 A schematic diagram of a driving timing sequence of a sub-pixel in a display panel provided by an embodiment of the present application is shown. Figure 2 and Figure 3 Taking the case where both the first switch module 211 and the second switch module 212 are turned on in response to a low level as an example, illustratively, the driving process of the sub-pixel 10 includes an information storage stage T01 and a display stage T02.

[0080] In the information storage stage T01, the first scan signal SCAN1 is at a low level VGL, the second scan signal SCAN2 is at a low level VGL, the first data signal VDATA1 is at a first data voltage Vdata11, the second data signal VDATA2 is at a first voltage Vdd1, the first power signal VDD is at a first voltage Vdd1, and the second power signal VSS is at a low level. The first switch module 211 is turned on in response to the low level of the first scan signal SCAN1, and transmits the first data voltage Vdata11 to the first control end of the storage driver module 213; the storage driver module 213 stores the image display information under the action of the first voltage Vdd1 and the first data voltage Vdata11. If the first data voltage Vdata11 is different, the stored image display information is different. In addition, the second switch module 212 is turned on in response to the low level of the second scan signal SCAN2, and the second data signal VDATA2 is at the first voltage Vdd1. In this way, in the information storage stage T01, the second control end of the storage driver module 213 is written with the first voltage Vdd1, which can avoid the unstable state caused by the second control end of the storage driver module 213 being in a floating state. It can be understood that, in the information storage stage T01, the voltage on the second data line 32 is the same as the voltage on the first power line Lvdd.

[0081] In the display stage T02, the first scan signal SCAN1 is at a low level VGL, the second scan signal SCAN2 is at a low level VGL, the first data signal VDATA1 is at a second voltage Vdd2, the second data signal VDATA2 is at a second data voltage VBSM, the first power signal VDD is at a first voltage Vdd1, and the second power signal VSS is at a low level. The second switch module 212 is turned on to transmit the second data voltage VBSM to the second control terminal of the storage driver module 213; the storage driver module 213 outputs a driving current according to the first voltage Vdd1 and the second data voltage VBSM to drive the light-emitting device 22 to emit light. The second data voltage VBSM can be defined as a voltage value that can make the storage driver module 213 just turn off in the 0th storage state, and the 0th storage state can be understood as a state when the storage driver module 213 is not storing. The second voltage Vdd2 is greater than or equal to the first voltage Vdd1, and the absolute value of the difference between the second voltage Vdd2 and the first voltage Vdd1 is less than the absolute value of the erase voltage. When the first control terminal of the storage driver module 213 is connected to the erase voltage, the image display information stored in the storage driver module 213 is erased. For example, whether the transistor of the storage driver module 213 is a P-type transistor or an N-type transistor, the erase voltage can be a negative voltage. In the display stage T02, the first control terminal of the storage driver module 213 is connected to the second voltage Vdd2, which can avoid the unstable state caused by the first control terminal of the storage driver module 213 being in a floating state, and avoid clearing the image display information stored in the storage driver module 213.

[0082] Each storage drive module 213 has n state information storage functions, where n is an integer greater than 1. The driving current is associated with the image display information. Under the condition that the first voltage Vdd1 and the second data voltage VBSM connected to the sub-pixel 20 remain unchanged, the driving current generated by the storage drive module 213 in the display stage T02 will change due to the different image display information stored in the information storage stage T01, thereby making the light emitting brightness of the light emitting device 22 different.

[0083] It should be noted that in the information storage stage T01 and the display stage T02, the second power signal VSS can maintain the same low level, for example, a negative voltage value. The first voltage Vdd1 of the first power signal VDD is a high level, usually a positive voltage value.

[0084] Different sub-pixels 21 may have different voltages of the first data signal VDATA1 connected to them in the information storage phase T01, so that different sub-pixels 21 may store different image display information. Different sub-pixels 21 may have the same voltage value of the second data voltage VBSM connected to them in the display phase T02.

[0085] Exemplarily, the driving process of the sub-pixel 10 may also include an erasing phase, in which the image display information stored in the storage driving module 213 is erased. Specifically, in the erasing phase, the first switch module 211 and the second switch module 212 are turned on, the first data signal VDATA1 is the third voltage Vdd3, the second data signal VDATA2 is the fourth voltage Vdd4, and the first power supply signal VDD is the fourth voltage Vdd4. Among them, Vdd3 meets the erasing condition, for example, Vdd3 minus Vdd4 is a negative voltage, and the absolute value of Vdd3-Vdd4 is greater than or equal to the absolute value of the erasing voltage. Exemplarily, in order to facilitate the application of voltage, in the erasing phase, Vdd4 can be a negative value, so as to ensure that the value of Vdd3 minus Vdd4 meets the erasing condition.

[0086] Figure 4 A driving timing diagram of a display panel provided in an embodiment of the present application is shown. Figure 1 and Figure 4 , still taking the first switch module 211 and the second switch module 212 in each sub-pixel 20 as an example of being turned on in response to a low level, illustratively, the driving process of the display panel 100 includes:

[0087] Information storage stage T1: During the entire information storage stage T1, the first power signal VDD maintains the first voltage vdd1, and the second power signal VSS maintains a low level; the first scan signals of each row change to a low level in a time-sharing manner row by row, and the time when the first scan signals of each row change to a low level does not overlap. The second scan signals of each row are all at a low level. The information storage stage T1 can be divided into i sub-storage stages according to the time when the first scan signals of each row change to a low level, that is, sub-storage stage T11 to sub-storage stage T1i. In each sub-storage stage, j first data lines transmit the first data voltage to the m sub-pixels 20 in a row respectively, so that each storage drive module 213 in the row stores the image display information according to the first voltage and the first data voltage connected to it. Among them, the first data voltage connected to each sub-pixel 20 in a row can be different, and the first data voltage transmitted by the same data line in different sub-storage stages can also be different. The first voltage connected to each sub-pixel 20 in different rows can be the same or different, and can be set according to actual needs. In addition, in each sub-storage phase, the j second data lines transmit the first voltage to the m sub-pixels 20 in a row, respectively. In addition, in the entire information storage phase T1, the second scanning signal may maintain a low level.

[0088] Display stage T2: During the entire display stage T2, the first power supply signal maintains the first voltage, and the second power supply signal maintains a low level. All scanning signals can maintain a low level at the same time, and the first switch modules 211 and the second switch modules 212 of all sub-pixels 20 are controlled to be turned on at the same time, and the second data voltage transmitted on the second data line is transmitted to the storage drive module 213, so that each storage drive module 213 outputs a driving current according to the first voltage, the second data voltage and the image display information stored therein, and the driving current drives the light-emitting device 22 to emit light.

[0089] The luminous brightness of the light emitting device 22 in the sub-pixel 20 is actually determined by the image display information stored in the storage driving module 213. Then, the control of the final color display screen can be achieved only by controlling the image display information stored in each sub-pixel 20, which provides a condition for each sub-pixel 20 to access the same second data voltage VBSM. If each sub-pixel 20 is connected to the same second data voltage VBSM in the display stage T2, since the data signals accessed by each row of sub-pixels 20 are the same, it is no longer necessary to control the scanning signal to change row by row, but all switch modules can be directly controlled to be turned on at the same time, so that all sub-pixels 20 work at the same time.

[0090] That is, in the display stage T2, all the second data voltages may be DC signals with the same voltage value. Also, the first scan signal and the second scan signal that maintain a low level in the display stage T2 may be DC signals with the same voltage value.

[0091] Since the application scenario of the display panel 100 usually requires the display panel 100 to display the same picture for a long time, that is, the display panel 100 needs to be in the display stage T2 for a long time and maintain the same display state; in fact, the frequency of use of the information storage stage T1 is not high. Under such demand conditions, the display panel 100 can be set to have only a built-in driving module for providing various control signals in the display stage T2, and the various control signals of the display panel 100 in the information storage stage T1 can be provided by an external driving device. In this way, the display panel 100 does not need a driving chip and a driving circuit board inside, only a DC power supply is needed, and the display panel 100 can display a static color picture. If the display picture needs to be modified, the driving device is connected to the display panel 100 and the image display information is rewritten. Therefore, this embodiment can effectively simplify the structure of the built-in driving module of the display panel 100 and reduce the cost of the display panel 100. At the same time, since the various control signals in the display stage are DC signals, there is no need to control the display panel 100 to refresh the picture frame by frame, which can effectively reduce the power consumption of the display panel.

[0092] In some embodiments, Figure 5As shown, the storage driving module 213 includes a first transistor M1, and the first transistor M1 includes a first gate g1 and a second gate g2. The first gate g1 serves as a first control terminal of the storage driving module 213, and the second gate g2 serves as a second control terminal of the storage driving module 213. The first electrode of the first transistor M1 is electrically connected to the first power line to access the first power signal VDD, and the second electrode of the first transistor M1 is electrically connected to the first electrode of the light-emitting device 22, and the second electrode of the light-emitting device 22 is connected to the second power signal VSS.

[0093] In the embodiment of the present application, the first transistor M1 of the sampling dual-gate, four-terminal device is used as the storage driving module 213, the first gate g1 can be used to control the first transistor M1 to store or erase image display information, and the second gate g2 can be used to control the first transistor M1 to drive display. By using two independent gates to control storage and driving respectively, the driving stability of the first transistor M1 can be improved, thereby improving the display effect.

[0094] In some embodiments, Figure 5 As shown, the first switch module 211 includes a second transistor M2, a gate of the second transistor M2 is electrically connected to the first scan line to access the first scan signal SCAN1, a first electrode of the second transistor M2 is electrically connected to the first data line 31, and a second electrode of the second transistor M2 is electrically connected to the first control terminal of the storage driver module 213. In different stages, the first data line 31 can be used to transmit different voltages.

[0095] The second switch module 212 includes a third transistor M3, a gate of the third transistor M3 is electrically connected to the second scan line to receive the second scan signal SCAN2, a first electrode of the third transistor M3 is electrically connected to the second data line 32, and a second electrode of the third transistor M3 is electrically connected to the second control terminal of the storage driver module 213. In different stages, the second data line 32 can be used to transmit different voltages.

[0096] In some embodiments, Figure 6 or Figure 7 As shown, in the thickness direction of the display panel, the active layer P of the first transistor M1 is spaced between the first gate g1 and the second gate g2. That is, the first gate g1 and the second gate g2 are respectively located on both sides of the active layer P of the first transistor M1, which is more conducive to independent control of the storage function and the driving function.

[0097] Exemplarily, the material of the active layer P includes at least one of polysilicon, amorphous silicon, and metal oxide. Metal oxides include indium oxide (In Oxide), indium zinc oxide (In-Zn Oxide), indium tin oxide (In-Sn Oxide), indium titanium oxide (In-Ti Oxide), indium gallium oxide (In-Ga Oxide), indium gallium aluminum oxide (In-Ga-Al Oxide), indium gallium tin oxide (In-Ga-Sn Oxide, also written as IGTO), gallium zinc oxide (Ga-Zn Oxide, also written as GZO), aluminum zinc oxide (Al-Zn Oxide, also written as AZO), indium aluminum zinc oxide (In-Al-Zn Oxide, also written as IAZO), indium tin zinc oxide (In-Sn-Zn Oxide, also written as ITZO), indium titanium zinc oxide (In-Ti-Zn Oxide), indium gallium zinc oxide (In-Ga-Zn Oxide, also written as IGZO), indium gallium tin zinc oxide (In-Ga-Sn-Zn Oxide, also written as IGZTO), indium gallium aluminum zinc oxide (In-Ga-Al-Zn Oxide, also written as IGAZO, IGZAO or IAGZO), gallium tin oxide (Ga-Sn Oxide), aluminum tin oxide (Al-SnOxide), etc.

[0098] In some embodiments, Figure 6 As shown, in the thickness direction of the display panel, the first gate g1 is located on a side of the active layer P of the first transistor M1 away from the substrate 10 , and the second gate g2 is located on a side of the active layer P of the first transistor M1 close to the substrate 10 .

[0099] Or, if Figure 7 As shown, in the thickness direction of the display panel, the first gate g1 is located on a side of the active layer P of the first transistor M1 close to the substrate 10 , and the second gate g2 is located on a side of the active layer P of the first transistor M1 away from the substrate 10 .

[0100] In addition, a first insulating layer 51 is disposed between the first gate g1 and the active layer P of the first transistor M1, and a second insulating layer 52 is disposed between the second gate g2 and the active layer P of the first transistor M1. The second insulating layer 52 is a buffer layer. The first insulating layer 51 includes a silicon nitride (SiN) layer, a silicon oxide (SiO) layer, or a stacked structure of silicon nitride and silicon oxide.

[0101] The number of storage states of the first transistor M1 is related to the stacking structure and / or thickness of the first insulating layer 51. For example, the more the stacking structure of the first insulating layer 51, the more storage states of the first transistor M1. For example, the thicker the first insulating layer 51, the more storage states of the first transistor M1.

[0102] In each embodiment of the present application, taking the first transistor M1 as a P-type transistor as an example, the principle of the first transistor M1 storing image display information and generating a driving current is as follows: in the information storage stage, a first voltage Vdd1 is applied to the first electrode of the first transistor M1, and a first data voltage Vdata11 is applied to the first gate of the first transistor M1. The first data voltage Vdata11 can be a negative voltage, which can change the basic electrical characteristics of the first transistor M1, that is, change the threshold voltage (Vth) of the first transistor M1, and the threshold voltage represents the image display information. After the first data voltage Vdata11 is removed, the threshold voltage of the first transistor M1 remains in the state just written, that is, the image display information is stored.

[0103] In the display stage, the first voltage Vdd1 is still applied to the first electrode of the first transistor M1, and the second voltage Vdd2 is applied to the first gate of the first transistor M1, which does not change the storage state of the first transistor M1, wherein the absolute value of the difference between the second voltage Vdd2 and the first voltage Vdd1 is smaller than the absolute value of the erase voltage, and when the erase voltage is applied to the first gate of the first transistor M1, the storage state of the first transistor M1 is erased.

[0104] In addition, the second data voltage VBSM is applied to the second gate of the first transistor M1. The second data voltage VBSM is the voltage at which the first transistor M1 is just turned off in the 0th storage state. In this stage, the first transistor M1 is the same as a conventional transistor with a fixed threshold voltage. Whether it is turned on is determined based on the relationship between the voltage difference between its second gate and the first electrode and the threshold voltage. That is, in the display stage, driven by the second data voltage and the first voltage, the first transistor M1 generates a driving current according to its threshold voltage. The threshold voltage of the first transistor M1 will not change again until a different first data voltage is applied to the first gate of the first transistor M1.

[0105] Figure 8 A characteristic diagram of the first transistor in the display panel provided by an embodiment of the present application is exemplarily shown. Among them, state 0 represents the 0th storage state of the first transistor M1, that is, the state when the first transistor M1 is not storing. State 1 to state 5 respectively represent the 5 states in which the first transistor M1 is storing. The horizontal axis represents the voltage difference VGS between the second gate and the first electrode of the first transistor M1, and the vertical axis represents the driving current IDS. The difference between the first voltage and the second data voltage VBSM is the voltage value when the first transistor M1 is just turned off in the 0th storage state. According to Figure 8It can be seen that in different states, the voltage difference VGS between the second gate and the first electrode of the first transistor M1 corresponds to different driving currents IDS, that is, when the same first voltage and second data voltage VBSM are applied to the first transistor M1 storing different image display information (different threshold voltages), the driving current generated by the first transistor M1 is different.

[0106] In some embodiments, Fig. 9 As shown, the sub-pixel 20 includes m pixel circuits 21 , and the m pixel circuits 21 are connected in parallel between the first power line Lvdd and the light-emitting device 22 , where m is an integer greater than 1.

[0107] Each pixel circuit 21 has n storage states, and when m pixel circuits 21 are connected in parallel, each sub-pixel 20 can have m*n storage states. One storage state corresponds to one grayscale, so each sub-pixel 20 can display m*n grayscales, which can improve the richness of the displayable images of the display panel.

[0108] In the m pixel circuits 21 of the same sub-pixel 20, each second transistor M2 is connected to the same first scan signal SCAN1, and the first electrode of each second transistor M2 is connected to a different first data line 31; each third transistor M3 is connected to the same second scan signal SCAN2, and the first electrode of each third transistor M3 is connected to the same second data line 32.

[0109] In some embodiments, Fig. 9 As shown, in the information storage stage, the first control terminals of at least two storage driving modules 213 in the same sub-pixel 20 receive different voltages from the first data line 31. In this way, the storage states of different storage driving modules 213 are different, so that multiple storage states of each sub-pixel 20 can be realized.

[0110] It should be noted that the transistor in the embodiment of the present application can be an N-type transistor or a P-type transistor. For an N-type transistor, the on-level is a high level and the off-level is a low level. That is, when the gate potential of the N-type transistor is a high level, the first pole and the second pole are connected, and when the gate potential of the N-type transistor is a low level, the first pole and the second pole are disconnected. For a P-type transistor, the on-level is a low level and the off-level is a high level. That is, when the gate potential of the P-type transistor is a low level, the first pole and the second pole are connected, and when the gate potential of the P-type transistor is a high level, the first pole and the second pole are disconnected. In a specific implementation, the gate of each of the above-mentioned transistors serves as its control terminal, and, according to the signal of the gate of each transistor and its type, its first electrode can be used as the source and the second electrode as the drain, or its first electrode can be used as the drain and the second electrode as the source, without making any distinction here. In addition, the on-level and off-level in the embodiments of the present application are general terms, the on-level refers to any level that can turn on the transistor, and the off-level refers to any level that can turn off / shut down the transistor.

[0111] It should also be noted that, in order to enable the display panel 100 to display a color image, each sub-pixel 20 in the display panel 100 may include a red sub-pixel, a blue sub-pixel, a green sub-pixel, and may further include a white sub-pixel. The number and arrangement of each color sub-pixel can be set according to requirements.

[0112] Based on the same inventive concept, an embodiment of the present application also provides a method for driving a display panel, which is used to drive the display panel provided by any embodiment of the present application and has corresponding beneficial effects. Fig.10 is a flow chart of a method for driving a display panel provided in an embodiment of the present application. Fig.10 The driving method of the display panel includes S110 and S120.

[0113] S110, information storage stage, transmitting a first voltage to a first power line; transmitting a scan signal to a first scan line to control the first switch module to be turned on, transmitting a scan signal to a second scan line to control the second switch module to be turned on; and transmitting a first data voltage to a first data line when the first switch module is turned on, so that each storage driving module stores image display information according to the first voltage and the first data voltage;

[0114] S120, in the display stage, a first voltage is transmitted to the first power line; a scan signal is transmitted to the first scan line to control the first switch module to be turned on, and a scan signal is transmitted to the second scan line to control the second switch module to be turned on; and when the first switch module is turned on, a second voltage is transmitted to the first data line, and when the second switch module is turned on, a second data voltage is transmitted to the second data line, so that each storage drive module outputs a drive current according to the first voltage and the second data voltage to drive the light-emitting device to emit light, and the drive current is associated with the image display information.

[0115] According to the driving method of the display panel provided in the embodiment of the present application, the storage driving module includes two control terminals, one of which is used to control the storage function, and the other is used to control the driving function. That is to say, storage and driving are controlled separately using different control terminals to avoid mutual influence between the two, so that the storage driving module can take into account storage and driving at the same time, which can improve the stability of the storage driving module, thereby improving the reliability of the display panel.

[0116] Exemplarily, the method further includes:

[0117] In the information storage stage, a scan signal is transmitted to the second scan line to control the second switch module to be turned on, and when the second switch module is turned on, a first voltage is transmitted to the second data line;

[0118] Preferably, in the display stage, a scan signal is transmitted to the first scan line to control the first switch module to be turned on, and when the first switch module is turned on, the second voltage is transmitted to the first data line.

[0119] Exemplarily, in the display stage, the scan signals transmitted to the first scan line and the second scan line are both DC signals, and the signals transmitted to the first data line and the second data line are also both DC signals.

[0120] In some embodiments, in S120, in the display stage, the absolute value of the difference between the second voltage connected to the first control terminal of the storage control module and the first voltage is less than or equal to the absolute value of the erasure voltage, and under the erasure voltage, the image display information stored in the storage driver module is erased. This can avoid the unstable state caused by the first control terminal of the storage driver module 213 being in a floating state, and avoid clearing the image display information stored in the storage driver module 213.

[0121] Based on the same inventive concept, the embodiment of the present application also provides a display panel screen update system, including a drive device and a display panel as described in any of the above embodiments, with corresponding technical effects. The drive device can provide each display panel with each control signal required in the information storage stage, so as to update the image display information stored in the storage drive module of each sub-pixel in each display panel.

[0122] Fig.11 A schematic diagram of the structure of a display panel screen update system provided by an embodiment of the present application is shown. Fig.11 The screen updating system of the display panel includes: a driving device 200 and a plurality of display panels 100. The driving device 200 includes: a scanning driving module 210, a power module 220 and a data voltage providing module 230.

[0123] The scan driving module 210 is used to provide a scan signal to the first scan line and the second scan line of the display panel 100. The power supply module 220 is used to provide a first voltage to the first power line of the display panel 100; the data voltage providing module 230 is used to provide a data voltage to the first data line and the second data line of the display panel 100.

[0124] In this embodiment, one driving device 200 is provided to update the screens of multiple display panels 100, thereby realizing a one-to-many function between the driving device 200 and the display panels 100, and saving a large amount of module driving cost.

[0125] Exemplarily, the driving device 200 is detachably connected to the display panel 100. Specifically, interfaces connected to the data lines, the scan lines, and the first power lines may be reserved in the display panel for plugging with the driving device 200. In actual application, the staff may update the image display information of each display panel 100 by plugging the driving device 200 with multiple display panels 100 in sequence.

[0126] According to the embodiments described above in the present application, these embodiments do not describe all the details in detail, nor do they limit the present application to the specific embodiments described. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can make good use of the present application and the modifications based on the present application. The present application is limited only by the claims and their full scope and equivalents.

Claims

1. A display panel, characterized in that: include: substrate; A sub-pixel, located on the substrate, the sub-pixel includes a pixel circuit and a light-emitting device, the pixel circuit includes a first switch module, a second switch module and a storage drive module; The storage driving module is connected between the light emitting device and the first power line, the first switch module is connected between the first data line and the first control terminal of the storage driving module, and the second switch module is connected between the second data line and the second control terminal of the storage driving module; the first switch module is used to transmit the voltage on the first data line to the first control terminal in response to the scanning signal on the first scanning line being turned on, and the second switch module is used to transmit the voltage on the second data line to the second control terminal in response to the scanning signal on the second scanning line being turned on; The storage driving module stores image display information according to the first voltage transmitted by the first power line and the first data voltage transmitted by the first data line, and outputs a driving current according to the first voltage transmitted by the first power line and the second data voltage transmitted by the second data line to drive the light emitting device to emit light.

2. The display panel according to claim 1, characterized in that: The storage driving module includes a first transistor, the first transistor includes a first gate and a second gate, the first gate is the first control end, the second gate is the second control end, the first electrode of the first transistor is electrically connected to the first power line, and the second electrode of the first transistor is electrically connected to the light emitting device.

3. The display panel according to claim 2, characterized in that: In the thickness direction of the display panel, an active layer of the first transistor is spaced between the first gate and the second gate.

4. The display panel according to claim 3, characterized in that: In the thickness direction of the display panel, the first gate is located on a side of the active layer of the first transistor away from the substrate, and the second gate is located on a side of the active layer of the first transistor close to the substrate; Alternatively, in the thickness direction of the display panel, the first gate is located on a side of the active layer of the first transistor close to the substrate, and the second gate is located on a side of the active layer of the first transistor away from the substrate; Preferably, a first insulating layer is provided between the first gate and the active layer of the first transistor, and a second insulating layer is provided between the second gate and the active layer of the first transistor; The first insulating layer includes a silicon nitride layer, a silicon oxide layer, or a stacked structure of silicon nitride and silicon oxide; Preferably, on a side away from the substrate, the first insulating layer comprises silicon oxide, silicon nitride and silicon oxide stacked in sequence.

5. The display panel according to claim 1, characterized in that: The first switch module includes a second transistor, a gate of the second transistor is electrically connected to the first scan line, a first electrode of the second transistor is electrically connected to the first data line, and a second electrode of the second transistor is electrically connected to the first control end; Preferably, the second switch module comprises a third transistor, a gate of the third transistor is electrically connected to the second scan line, a first electrode of the third transistor is electrically connected to the second data line, and a second electrode of the third transistor is electrically connected to the second control terminal.

6. The display panel according to any one of claims 1 to 5, characterized in that: The sub-pixel includes m pixel circuits, and the m pixel circuits are connected in parallel between the first power line and the light-emitting device, where m is an integer greater than 1.

7. The display panel according to claim 6, characterized in that: The first control terminals of at least two storage driving modules in the same sub-pixel are connected to different voltages from the first data line.

8. A method for driving a display panel, characterized in that: include: In the information storage stage, a first voltage is transmitted to the first power line; Transmitting a scan signal to the first scan line to control the first switch module to be turned on; and transmitting a first data voltage to the first data line when the first switch module is turned on, so that the storage driving module stores image display information according to the first voltage and the first data voltage; In a display stage, the first voltage is transmitted to the first power line; Transmitting a scan signal to the second scan line to control the second switch module to be turned on; When the second switch module is turned on, the second data voltage is transmitted to the second data line, so that the storage driving module outputs a driving current according to the first voltage and the second data voltage to drive the light emitting device to emit light.

9. The method according to claim 8, characterized in that The driving method further comprises: In the information storage stage, a scan signal is transmitted to the second scan line to control the second switch module to be turned on, and when the second switch module is turned on, the first voltage is transmitted to the second data line; Preferably, in the display stage, a scan signal is transmitted to the first scan line to control the first switch module to be turned on, and when the first switch module is turned on, a second voltage is transmitted to the first data line; The absolute value of the difference between the second voltage and the first voltage is smaller than the absolute value of the erasing voltage, and at the erasing voltage, the image display information stored in the storage driving module is erased; Preferably, in the display stage, the scan signals transmitted to the first scan line and the second scan line are both direct current signals.

10. A display device, characterized in that: comprising a driving device and a display panel as claimed in any one of claims 1 to 7; The driving device comprises: A scan driving module, used for providing a scan signal to the first scan line and the second scan line of the display panel; A power module, used for providing a first voltage to a first power line of the display panel; The data voltage providing module is used to provide data voltage to the first data line and the second data line of the display panel.

Images