Display panel and its driving method, display device

Abstract

This application discloses a display panel and its driving method and 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 terminal of the storage driving module; and a second switch module is connected between a second data line and a second control terminal of the storage driving module. The storage driving module stores image display information based on a first voltage transmitted through the first power line and a first data voltage transmitted through the first data line, and outputs a driving current based on the first voltage transmitted through the first power line and a second data voltage transmitted through the second data line to drive the light-emitting device to emit light. According to the embodiments of this application, the stability of the display panel can be improved.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a display panel and its driving method, and a display device. Background Technology

[0002] In existing technologies, electronic tags are mostly implemented using liquid crystal or electronic ink display technologies. However, liquid crystal display tags are relatively thick and lack dynamic bending characteristics, while electronic ink tags have poor color display effects and require the addition of a passive light source to achieve visibility. Furthermore, the color display effects of electronic tags prepared using the aforementioned display technologies are generally poor. Summary of the Invention

[0003] This application provides a display panel and its driving method and display device, which can improve the stability of the display panel.

[0004] In a first aspect, embodiments of this application provide a display panel, comprising: a substrate; and sub-pixels located on the substrate, each sub-pixel including a pixel circuit and a light-emitting device. The pixel circuit includes a first switching module, a second switching module, and a storage driving module. The storage driving module is connected between the light-emitting device and a first power line. The first switching module is connected between a first data line and a first control terminal of the storage driving module. The second switching module is connected between a second data line and a second control terminal of the storage driving module. The first switching module is configured to transmit a voltage on the first data line to the first control terminal in response to a scan signal on the first scan line. The second switching module is configured to transmit a voltage on the second data line to the second control terminal in response to a scan signal on the second scan line. The storage driving module stores image display information based on 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 based on 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 one possible embodiment of the first aspect, the storage driving module includes a first transistor, the first transistor including a first gate and a second gate, the first gate being a first control terminal and the second gate being a second control terminal, the first electrode of the first transistor being electrically connected to a first power line, and the second electrode of the first transistor being electrically connected to a light-emitting device.

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

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

[0009] Preferably, a first insulating layer is disposed between the first gate and the active layer of the first transistor, and a second insulating layer is disposed 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 comprises silicon oxide, silicon nitride, and silicon oxide stacked sequentially.

[0012] In one possible embodiment of the first aspect, the first switching module includes a second transistor, the gate of the second transistor being electrically connected to a first scan line, the first terminal of the second transistor being electrically connected to a first data line, and the second terminal of the second transistor being electrically connected to a first control terminal.

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

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

[0015] In one possible embodiment of the first aspect, the first control terminals of at least two storage driver 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, embodiments of this application provide a method for driving a display panel, used to drive a display panel as described in any embodiment of the first aspect;

[0017] The driving methods include:

[0018] During the information storage 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 when the first switch module is turned on, a first data voltage is transmitted to the first data line so that each storage driver module stores image display information according to the first voltage and the first data voltage.

[0019] During the display phase, 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 turn 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 driver 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 one possible embodiment of the second aspect, the driving method further includes:

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

[0022] Preferably, during the display stage, a scanning signal is transmitted to the first scan line to control the first switch module to turn 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 less than the absolute value of the erase voltage. Under the erase voltage, the image display information stored in the storage driver module is erased.

[0024] Preferably, the scanning signals transmitted to the first scan line and the second scan line during the display stage are both DC signals.

[0025] Based on the same inventive concept, in a third aspect, embodiments of this application provide 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] The scan drive module is used to provide scan signals to the first scan line and the second scan line of the display panel;

[0028] The power module is used to provide a first voltage to the first power line of the display panel;

[0029] A data voltage supply module is used to supply data voltage to the first data line and the second data line of the display panel.

[0030] Preferably, the drive unit is detachably connected to the display panel.

[0031] According to the embodiments of this application, the storage driver module includes two control terminals. One control terminal is used to control the storage function, and the other control terminal is used to control the driving function. That is, storage and driving are controlled separately using different control terminals to avoid mutual interference between the two. This allows the storage driver module to simultaneously handle storage and driving, thereby improving the stability of the storage driver module and thus improving the reliability of the display panel. Attached Figure Description

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

[0033] Figure 1 This illustration shows a structural schematic diagram of a display panel provided in an embodiment of this application;

[0034] Figure 2 This illustration shows a schematic diagram of a sub-pixel module in a display panel provided in an embodiment of this application;

[0035] Figure 3 This illustration shows a driving timing diagram of a sub-pixel in a display panel provided in an embodiment of this application;

[0036] Figure 4 This diagram illustrates a driving timing schematic of a display panel provided in an embodiment of this application.

[0037] Figure 5 This illustration shows a circuit structure diagram of a sub-pixel in a display panel provided in an embodiment of this application;

[0038] Figure 6 This illustration shows a cross-sectional structural diagram of a sub-pixel in a display panel provided in an embodiment of this application;

[0039] Figure 7 This illustration shows another cross-sectional structure diagram of a sub-pixel in a display panel provided in an embodiment of this application;

[0040] Figure 8 This diagram illustrates a characteristic of a first transistor in a display panel provided in an embodiment of this application.

[0041] Figure 9 This illustration shows another circuit structure diagram of a sub-pixel in a display panel provided in an embodiment of this application;

[0042] Figure 10 This illustration shows a flowchart of a display panel driving method provided in an embodiment of this application;

[0043] Figure 11 This is a schematic diagram of a display device provided in an embodiment of this application.

[0044] Explanation of reference numerals in the attached figures:

[0045] 100. Display panel;

[0046] 10. Substrate;

[0047] 20. Subpixels;

[0048] 21. Pixel circuit;

[0049] 211. First switch module; 212. Second switch module; 213. Storage driver module;

[0050] 22. Light-emitting devices;

[0051] 31. First data line; 32. Second data line;

[0052] Lvdd, first power cord;

[0053] Lvss, second power line;

[0054] 41. First scan line;

[0055] 42. Second scan line;

[0056] 51. First insulating layer; 52. Second insulating layer;

[0057] 200. Drive unit;

[0058] 210. Scan driver module; 220. Power supply module; 230. Data voltage supply module. Detailed Implementation

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

[0060] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0061] It should be understood that when describing the structure of a component, when referring to a layer or region as being "above" or "on top of" another layer or region, it can mean that it is directly above the other layer or region, or that it contains other layers or regions between it and the other layer or region. Furthermore, if the component is flipped over, that layer or region will be located "below" or "under" the other layer or region.

[0062] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0063] It should be noted that when a component is described as "connected" or "electrically connected" to another component, it can be directly connected to the other component, or there may be one or more intermediate components in between.

[0064] Various modifications and variations can be made to this application without departing from its spirit or scope, which will be apparent to those skilled in the art. Therefore, this application is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the embodiments provided in this application can be combined with each other without contradiction.

[0065] As described in the background section, electronic tags using liquid crystal or electronic ink display technologies suffer from poor color display quality. OLED (Organic Light-Emitting Device) display technology, especially AMOLED (Active-Matrix Organic Light-Emitting Diode) technology, offers superior color display and flexibility, making it the mainstream display technology. Applying OLED display technology to low-cost electronic tag displays, achieving vibrant colors, flexible display capabilities, and eliminating the need for an external light source, will significantly improve the display performance of electronic tags.

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

[0067] To address the aforementioned technical problems, this application provides a display panel and its driving method, as well as a display device. The embodiments will be described below with reference to the accompanying drawings. For example, the display panel includes an electronic tag.

[0068] like Figure 1 As shown, the display panel 100 provided in this embodiment includes a substrate 10 and sub-pixels 20. The sub-pixels 20 are located on the substrate 10.

[0069] Figure 1 The illustration exemplarily shows a display panel 100 comprising i*j (i rows and j columns) sub-pixels 20. 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 are also arranged on the substrate 10 to drive the sub-pixels 20 to emit light and display an image. Exemplarily, along a top-to-bottom direction, the first power line Lvdd1 to the first power line Lvddi of the first row are respectively connected to the sub-pixels 20 of the first row to the sub-pixels 20 of the i-th row; the second power lines Lvss1 to the second power lines Lvssi of the first row are respectively connected to the sub-pixels 20 of the first row to the sub-pixels 20 of the i-th row; and the first scan lines 41_1 to 41_i of the first row are respectively connected to the sub-pixels 20 of the first row to the sub-pixels 20 of the i-th row. 20. The second scan line 42_1 of the first row to the second scan line 42_i of the i-th row are respectively connected to the sub-pixels 20 of the first row to the sub-pixels 20 of the i-th row. And, along the direction from left to right, the first data line 31_1 of the first column to the first data line 31_j of the j-th column are respectively connected to the sub-pixels 20 of the first column to the sub-pixels 20 of the j-th column. The second data line 32_1 of the first column to the second data line 32_j of the j-th column are respectively connected to the sub-pixels 20 of the first column to the sub-pixels 20 of the j-th column.

[0070] For example, the specific structure of each sub-pixel 20 can be the same. Figure 1 The structure of sub-pixel 20 in the first row and first column is given as an example. Specifically, sub-pixel 20 includes pixel circuit 21 and light-emitting device 22, and pixel circuit 21 is used to drive 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 driver module 213.

[0072] The storage driver 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 terminal of the storage driver module 213. The second switch module 212 is connected between the second data line 32 and the second control terminal of the storage driver module 213. The first switch module 211 is used to transmit the voltage on the first data line 31 to the first control terminal of the storage driver module 213 in response to the scanning signal on the first scan line 41. The second switch module 212 is used to transmit the voltage on the second data line 32 to the second control terminal of the storage driver module 213 in response to the scanning signal on the second scan line 42. The storage driver 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 to 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 to drive the light-emitting device 22 to emit light. The driving current is associated with the image display information.

[0073] Figure 2 This diagram illustrates a structural schematic of a sub-pixel in a display panel according to an embodiment of this application. Please refer to... Figure 1 and Figure 2 The connection method of sub-pixel 20 can be as follows: the control terminal 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 terminal 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 terminal of the first switch module 211 is electrically connected to the first control terminal of the storage driver module 213.

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

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

[0076] The inventors discovered that in transistor devices with both storage and driving functions, if storage and driving are controlled by the same control terminal, writing and erasing require voltage changes in the data signal. When writing to a state, because the transistor is a storage-type structure with a single control terminal, the threshold voltage of the transistor is prone to shift under the gate voltage, resulting in poor stability of the transistor device with both storage and driving functions.

[0077] According to the display panel provided in the embodiments of this application, the storage driver module includes two control terminals. One control terminal is used to control the storage function, and the other control terminal is used to control the driving function. That is, storage and driving are controlled separately using different control terminals to avoid mutual interference between the two. This allows the storage driver module to take into account both storage and driving simultaneously, which can improve the stability of the storage driver module and thus improve the reliability of the display panel.

[0078] Below, we will first explain the driving process of a sub-pixel 20, and then explain the driving process of the display panel.

[0079] Figure 3 This diagram illustrates a driving timing of a sub-pixel in a display panel according to an embodiment of this application. (In conjunction with...) Figure 2 and Figure 3 Taking the example that both the first switch module 211 and the second switch module 212 respond to a low level and are turned on, 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 low (VGL), the second scan signal SCAN2 is low (VGL), the first data signal VDATA1 is the first data voltage Vdata11, the second data signal VDATA2 is the first voltage Vdd1, the first power signal VDD is the first voltage Vdd1, and the second power signal VSS is low. The first switch module 211 responds to the low level of the first scan signal SCAN1 by transmitting the first data voltage Vdata11 to the first control terminal of the storage driver module 213. The storage driver module 213 stores image display information under the influence of the first voltage Vdd1 and the first data voltage Vdata11. Different first data voltages Vdata11 result in different stored image display information. Additionally, the second switch module 212 responds to the low level of the second scan signal SCAN2 by transmitting the second data signal VDATA2 as the first voltage Vdd1. Thus, in the information storage stage T01, the second control terminal of the storage driver module 213 writes the first voltage Vdd1, avoiding instability caused by the second control terminal of the storage driver module 213 being in a floating state. Understandably, during the information storage phase T01, the voltage on the second data line 32 is the same as the voltage on the first power line Lvdd.

[0081] During the display phase T02, the first scan signal SCAN1 is low (VGL), the second scan signal SCAN2 is low (VGL), the first data signal VDATA1 is the second voltage Vdd2, the second data signal VDATA2 is the second data voltage VBSM, the first power signal VDD is the first voltage Vdd1, and the second power signal VSS is low. The second switch module 212 is turned on, transmitting the second data voltage VBSM to the second control terminal of the storage driver module 213. The storage driver module 213 outputs a drive current based on 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 the voltage value that causes the storage driver module 213 to be turned off in the 0th storage state, which can be understood as the state when the storage driver module 213 is not storing data. When 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, the image display information stored in the storage driver module 213 is erased when the erase voltage is applied to the first control terminal of the storage driver module 213. For example, regardless of whether the transistor in the storage driver module 213 is a P-type transistor or an N-type transistor, the erase voltage can be negative. In the display stage T02, applying the second voltage Vdd2 to the first control terminal of the storage driver module 213 avoids instability caused by the first control terminal of the storage driver module 213 being in a floating state, and also avoids clearing the image display information stored in the storage driver module 213.

[0082] Each storage driver module 213 has n state information storage functions, where n is an integer greater than 1. The driving current is related to 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 driver module 213 in the display stage T02 will change due to the different image display information stored in the information storage stage T01, thereby causing the light emission brightness of the light-emitting device 22 to be different.

[0083] It should be noted that during the information storage phase T01 and the display phase 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 high, typically a positive voltage value.

[0084] Different sub-pixels 21 may have different voltages for the first data signal VDATA1 during the information storage stage T01, allowing different sub-pixels 21 to store different image display information. Different sub-pixels 21 may have the same voltage value for the second data signal VBSM during the display stage T02.

[0085] For example, the driving process of sub-pixel 10 may further include an erasure phase, in which the image display information stored in the storage driving module 213 is erased. Specifically, in the erasure 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 signal VDD is the fourth voltage Vdd4. Vdd3 satisfies the erasure 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 erasure voltage. For example, to facilitate voltage application, Vdd4 may be negative in the erasure phase to ensure that the value of Vdd3 minus Vdd4 satisfies the erasure condition.

[0086] Figure 4 This diagram illustrates a driving timing schematic for a display panel provided in an embodiment of this application. Please refer to... Figure 1 and Figure 4 Taking the first switch module 211 and the second switch module 212 in each sub-pixel 20 responding to a low level as an example, the driving process of the display panel 100 includes, by way of example, the following:

[0087] Information storage stage T1: Throughout the entire information storage stage T1, the first power signal VDD maintains the first voltage vdd1, and the second power signal VSS remains at a low level. The first scan signal of each row changes to a low level sequentially, and the times when the first scan signal of each row changes to a low level do not overlap. The second scan signal of each row is at a low level. The information storage stage T1 can be divided into i sub-storage stages, namely sub-storage stages T11 to T1i, according to the time when the first scan signal of each row changes to a low level. In each sub-storage stage, j first data lines transmit the first data voltage to m sub-pixels 20 in a row, so that each storage driver module 213 in that row stores image display information according to the first voltage and the first data voltage it receives. The first data voltage received by 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 received by each sub-pixel 20 in different rows can be the same or different, depending on the actual requirements. Additionally, in each sub-storage stage, j second data lines transmit the first voltage to m sub-pixels 20 in a row, respectively. Furthermore, throughout the entire information storage stage T1, the second scan signal can remain at a low level.

[0088] Display Phase T2: Throughout the entire display phase T2, the first power signal maintains the first voltage, and the second power signal maintains a low level. All scan signals can simultaneously maintain a low level, controlling the first switch module 211 and the second switch module 212 of all sub-pixels 20 to be turned on simultaneously. This transmits the second data voltage transmitted on the second data line to the storage driver module 213, causing each storage driver module 213 to output a drive current based on the first voltage, the second data voltage, and the image display information it stores. The drive current drives the light-emitting device 22 to emit light.

[0089] The brightness of the light-emitting device 22 in sub-pixel 20 is actually determined by the image display information stored in the storage driver module 213. Therefore, the final color display image can be controlled simply by controlling the image display information stored in each sub-pixel 20, which provides the condition for each sub-pixel 20 to be connected to the same second data voltage VBSM. If each sub-pixel 20 is connected to the same second data voltage VBSM during the display stage T2, since the data signal connected to each row of sub-pixels 20 is the same, it is no longer necessary to control the scanning signal to change row by row. Instead, all switching modules can be directly controlled to be turned on simultaneously, so that all sub-pixels 20 work at the same time.

[0090] In other words, during the display phase T2, all second data voltages can be DC signals with the same voltage value. Also, during the display phase T2, the first scan signal and the second scan signal, which remain at a low level, can be DC signals with the same voltage value.

[0091] Since the application scenarios of the display panel 100 typically require it to display the same image for an extended period, meaning it needs to remain in display phase T2 for a considerable time while maintaining the same display state, the information storage phase T1 is not frequently used. Under these conditions, the display panel 100 can be configured to only have a built-in driver module providing the control signals for display phase T2, while the control signals for information storage phase T1 can be provided by an external driver device. This eliminates the need for a driver chip and driver circuit board within the display panel 100; only a DC power supply is required to display a static color image. If the displayed image needs modification, the driver device can be connected to the display panel 100 to rewrite the image display information. Therefore, this embodiment effectively simplifies the structure of the built-in driver module in the display panel 100, reducing its cost. Furthermore, since all control signals in the display phase are DC signals, there is no need to control the display panel 100 to refresh the image frame by frame, effectively reducing the power consumption of the display panel.

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

[0093] In this embodiment, 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 the 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, such as Figure 5 As shown, the first switch module 211 includes a second transistor M2. The gate of the second transistor M2 is electrically connected to the first scan line to receive the first scan signal SCAN1. The first terminal of the second transistor M2 is electrically connected to the first data line 31, and the second terminal of the second transistor M2 is electrically connected to the first control terminal of the storage drive module 213. At different stages, the first data line 31 can be used to transmit different voltages.

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

[0096] In some embodiments, such as 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 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] For example, the material of the active layer P includes at least one of polycrystalline silicon, 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 aluminum gallium 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), and 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, such as Figure 6 As shown, in the thickness direction of the display panel, the first gate g1 is located on the side of the active layer P of the first transistor M1 away from the substrate 10, and the second gate g2 is located on the side of the active layer P of the first transistor M1 close to the substrate 10.

[0099] Or, such as Figure 7 As shown, in the thickness direction of the display panel, the first gate g1 is located on the side of the active layer P of the first transistor M1 close to the substrate 10, and the second gate g2 is located on the 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 stacked structure and / or thickness of the first insulating layer 51. For example, the more stacked structures the first insulating layer 51 has, the more storage states the first transistor M1 has. For example, the greater the thickness of the first insulating layer 51, the more storage states the first transistor M1 has.

[0102] In various embodiments of this application, taking a P-type transistor as an example, the principle of the first transistor M1 storing image display information and generating drive current is as follows: During the information storage stage, a first voltage Vdd1 is applied to the first terminal 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. This 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 it was in when it was written, that is, the image display information is stored.

[0103] During the display phase, a first voltage Vdd1 is still applied to the first terminal of the first transistor M1, and a second voltage Vdd2 is applied to the first gate of the first transistor M1. This does not change the storage state of the first transistor M1. 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 erase voltage is applied to the first gate of the first transistor M1, the storage state of the first transistor M1 is erased.

[0104] Furthermore, a second data voltage VBSM is applied to the second gate of the first transistor M1. VBSM is the voltage at which the first transistor M1 was just turned off in its 0th storage state. During this stage, the first transistor M1 behaves similarly to a conventional transistor with a fixed threshold voltage, determining whether to conduct based on the relationship between the voltage difference between its second gate and first terminal and the threshold voltage. That is, during the display stage, driven by the second data voltage and the first voltage, the first transistor M1 generates a drive current based on its threshold voltage. The threshold voltage of the first transistor M1 will not change again until a different first data voltage is applied to its first gate.

[0105] Figure 8 An exemplary schematic diagram of a first transistor in a display panel provided in this application embodiment is shown. State 0 represents the 0th storage state of the first transistor M1, i.e., the state when the first transistor M1 is not storing data. States 1 to 5 represent the five states in which the first transistor M1 is storing data, respectively. The horizontal axis represents the voltage difference VGS between the second gate and the first terminal of the first transistor M1, and the vertical axis represents the drive current IDS. The difference between the first voltage and the second data voltage VBSM is the voltage value of the first transistor M1 when it is just turned off in the 0th storage state. Figure 8It can be seen that, under different states, the voltage difference VGS between the second gate and the first terminal of the first transistor M1 corresponds to different drive currents IDS. That is, when the same first voltage and second data voltage VBSM are applied to the first transistor M1 which stores different image display information (different threshold voltages), the magnitude of the drive current generated by the first transistor M1 is different.

[0106] In some embodiments, such as Figure 9 As shown, sub-pixel 20 includes m pixel circuits 21, which 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. 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 gray level, so each sub-pixel 20 can display m*n gray levels, which can improve the richness of the image that the display panel can display.

[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 different first data lines 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, such as Figure 9 As shown, during the information storage stage, the voltages connected to the first control terminals of at least two storage driver modules 213 in the same sub-pixel 20 from the first data line 31 are different. This results in different storage states for different storage driver modules 213, facilitating the implementation of multiple storage states for each sub-pixel 20.

[0110] It should be noted that the transistors in the embodiments of this application can be either N-type or P-type transistors. For N-type transistors, the on-level is high and the off-level is low. That is, when the gate potential of an N-type transistor is high, its first and second terminals are connected; when the gate potential is low, its first and second terminals are off. For P-type transistors, the on-level is low and the off-level is high. That is, when the gate potential of a P-type transistor is low, its first and second terminals are connected; when the gate potential is high, its first and second terminals are off. In specific implementation, the gate of each transistor is used as its control terminal. Furthermore, depending on the signal and type of the gate of each transistor, its first terminal can be used as the source and its second terminal as the drain, or its first terminal can be used as the drain and its second terminal as the source. No distinction is made here. In addition, the on-level and off-level in the embodiments of this 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 / turn off the transistor.

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

[0112] Based on the same inventive concept, this application also provides a method for driving a display panel, which is used to drive the display panel provided in any embodiment of this application and has corresponding beneficial effects. Figure 10 This is a schematic flowchart illustrating a driving method for a display panel provided in an embodiment of this application. See also... Figure 10 The driving method for the display panel includes S110 and S120.

[0113] S110, Information storage 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 turn on; a scan signal is transmitted to the second scan line to control the second switch module to turn 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 driver module stores image display information according to the first voltage and the first data voltage.

[0114] S120, during the display phase, 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 turn on, and a scan signal is transmitted to the second scan line to control the second switch module to turn 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 driver 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 display panel driving method provided in the embodiments of this application, the storage driving module includes two control terminals. One control terminal is used to control the storage function, and the other control terminal is used to control the driving function. That is, storage and driving are controlled separately using different control terminals to avoid mutual interference between the two. This allows the storage driving module to simultaneously handle storage and driving, thereby improving the stability of the storage driving module and thus improving the reliability of the display panel.

[0116] For example, the method further includes:

[0117] During the information storage stage, a scanning signal is transmitted to the second scan line to control the second switch module to turn on, and when the second switch module is turned on, a first voltage is transmitted to the second data line.

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

[0119] For example, during the display phase, the scanning 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, during S120, in the display stage, the absolute value of the difference between the second voltage and the first voltage connected to the first control terminal of the storage control module is less than or equal to the absolute value of the erase voltage. Under the erase voltage, the image display information stored in the storage driver module is erased. This avoids the instability caused by the first control terminal of the storage driver module 213 being in a floating state, and also avoids clearing the image display information stored in the storage driver module 213.

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

[0122] Figure 11 This diagram illustrates a structural schematic of a screen update system for a display panel provided in an embodiment of this application. See also... Figure 11 The display panel's screen update system includes a driving device 200 and multiple display panels 100. The driving device 200 includes a scan driving module 210, a power supply module 220, and a data voltage supply module 230.

[0123] The scan drive module 210 is used to provide scan signals 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 supply module 230 is used to provide data voltage to the first data line and the second data line of the display panel 100.

[0124] In this embodiment, a driving device 200 is provided to update the screen of multiple display panels 100, realizing the one-to-many function between the driving device 200 and the display panels 100, which can save a lot of module driving costs.

[0125] For example, the driving device 200 is detachably connected to the display panel 100. Specifically, the display panel may have reserved interfaces for connecting to each data line, each scan line, and each first power line for plugging into the driving device 200. In practical applications, operators can update the image display information of each display panel 100 by sequentially plugging the driving device 200 into multiple display panels 100.

[0126] The embodiments described above are not exhaustive, nor do they limit the application to the specific embodiments described herein. Clearly, many modifications and variations can be made based on the above description. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to effectively utilize this application and its modifications. This 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 is located on the substrate. The sub-pixel includes a pixel circuit and a light-emitting device. The pixel circuit includes a first switching module, a second switching module, and a storage driving module. The storage driver 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 driver module. The second switch module is connected between the second data line and the second control terminal of the storage driver 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 scan line. 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 scan line. The first control terminal and the second control terminal are two different control terminals. 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 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. The storage driving module includes a first transistor, which includes a first gate and a second gate. The first gate is the first control terminal, and the second gate is the second control terminal. 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.

2. The display panel according to claim 1, 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.

3. The display panel according to claim 2, characterized in that, In the thickness direction of the display panel, the first gate is located on the side of the active layer of the first transistor away from the substrate, and the second gate is located on the 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 the side of the active layer of the first transistor closer to the substrate, and the second gate is located on the side of the active layer of the first transistor away from the substrate.

4. The display panel according to claim 1, characterized in that, A first insulating layer is disposed between the first gate and the active layer of the first transistor, and a second insulating layer is disposed 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.

5. The display panel according to claim 4, characterized in that, On the side away from the substrate, the first insulating layer comprises silicon oxide, silicon nitride, and silicon oxide stacked sequentially.

6. The display panel according to claim 1, characterized in that, The first switching module includes a second transistor, the gate of the second transistor is electrically connected to the first scan line, the first terminal of the second transistor is electrically connected to the first data line, and the second terminal of the second transistor is electrically connected to the first control terminal.

7. The display panel according to claim 1, characterized in that, The second switching module includes a third transistor, the gate of which is electrically connected to the second scan line, the first terminal of which is electrically connected to the second data line, and the second terminal of which is electrically connected to the second control terminal.

8. The display panel according to any one of claims 1-7, characterized in that, The sub-pixel includes m pixel circuits, which are connected in parallel between the first power line and the light-emitting device, where m is an integer greater than 1.

9. The display panel according to claim 8, characterized in that, The voltages connected to the first control terminals of at least two of the storage driver modules in the same sub-pixel are different from those connected to the first data line.

10. A driving method for a display panel, characterized in that, include: During the information storage phase, the first voltage is transmitted to the first power line; Transmit a scan signal to the first scan line to control the first switch module to turn on; When the first switch module is turned on, a first data voltage is transmitted to the first data line so that the storage driver module stores image display information according to the first voltage and the first data voltage. During the display phase, the first voltage is transmitted to the first power line; Transmit a scan signal to the second scan line to control the second switch module to turn on; When the second switch module is turned on, a second data voltage is transmitted to the second data line, so that the storage driver module outputs a drive current according to the first voltage and the second data voltage to drive the light-emitting device to emit light. The storage driver 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 driver module. The second switch module is connected between the second data line and the second control terminal of the storage driver module. The first control terminal and the second control terminal are two different control terminals.

11. The method according to claim 10, characterized in that, The driving method further includes: During the information storage phase, a scanning signal is transmitted to the second scan line to control the second switch module to turn on, and when the second switch module is turned on, the first voltage is transmitted to the second data line.

12. The method according to claim 10, characterized in that, The driving method further includes: during the display phase, transmitting a scanning signal to the first scan line to control the first switch module to be turned on, and transmitting a second voltage to the first data line when the first switch module is turned on; The absolute value of the difference between the second voltage and the first voltage is less than the absolute value of the erase voltage. Under the erase voltage, the image display information stored in the storage driver module is erased.

13. The method according to claim 10, characterized in that, The driving method further includes: during the display phase, the scanning signals transmitted to the first scan line and the second scan line are both DC signals.

14. A display device, characterized in that, Includes a driving device and a display panel as described in any one of claims 1-9; The driving device includes: A scan driving module is used to provide scan signals to the first scan line and the second scan line of the display panel; A power module is used to provide a first voltage to the first power line of the display panel; A data voltage supply module is used to supply data voltage to the first data line and the second data line of the display panel.

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