Driving circuit of display panel and display device

Abstract

The invention discloses a driving circuit of a display panel and a display device, the driving circuit comprises a plurality of pixel driving circuits, and each pixel unit comprises at least one sub-pixel unit and at least one self-refreshing unit; the pixel driving circuit comprises a sub-pixel driving circuit and a self-refreshing driving circuit. The display panel comprises a first display mode and a second display mode, and in the first display mode, the sub-pixel driving circuit drives the sub-pixel units to display; in the second display mode, the self-refreshing driving circuit drives the self-refreshing unit to display; wherein the second display mode is a screen-off display mode or a static display mode. According to the display device, the self-refreshing unit is additionally arranged in the pixel unit, when the sub-pixel unit does not display, the self-refreshing unit is used for displaying, driving can be independently carried out through the self-refreshing driving circuit, and therefore a sub-pixel driving circuit is prevented from being used, and power consumption of screen turn-off or static display is reduced.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a driving circuit and display device for a display panel. Background Technology

[0002] Screen refresh rate refers to the number of times a monitor can refresh its display per second. It is a crucial indicator of monitor performance, affecting display quality and user experience. With continuous technological advancements, monitor refresh rates are constantly improving, and more and more consumers are paying attention to this parameter. The display on an LCD panel is achieved through the control of pixel TFTs within the control panel. Specifically, horizontal scan signal lines transmit signals to the gate to control the on / off state of the pixel TFTs, and vertical data signal lines transmit signals to the source electrode, writing data signals from the pixel TFTs to the pixel electrodes. Once all pixel TFTs in the display area have been scanned, the number of refreshes is counted as one. Increasing the number of frames refreshed per second increases the screen refresh rate.

[0003] However, because LCD panels use a progressive scan driving method, they cannot perform low-power screen-off or static display when the overall refresh rate is reduced. As a result, current LCD panels cannot reduce power consumption when they are in a screen-off or static display mode. Summary of the Invention

[0004] The purpose of this application is to provide a driving circuit and display device for a display panel. By additionally setting a self-refreshing unit in the pixel unit, the self-refreshing unit can display when the sub-pixel unit is not displaying. It can be driven by the self-refreshing driving circuit alone, thereby avoiding the use of the sub-pixel driving circuit and reducing the power consumption when the screen is off or in static display mode.

[0005] This application discloses a driving circuit for a display panel. The display panel includes multiple pixel units, and the driving circuit includes multiple pixel driving circuits, each of which drives the multiple pixel units. Each pixel unit includes at least one sub-pixel unit and at least one self-refreshing unit. The pixel driving circuit includes a sub-pixel driving circuit and a self-refreshing driving circuit. The display panel includes a first display mode and a second display mode. In the first display mode, the sub-pixel driving circuit drives the sub-pixel unit to display. In the second display mode, the self-refreshing driving circuit drives the self-refreshing unit to display. The second display mode is either a screen-off display or a static display mode.

[0006] Optionally, the driving circuit further includes multiple data lines and multiple scan lines; within a pixel unit, the sub-pixel driving circuit and the self-refreshing driving circuit are connected to the same scan line; the sub-pixel driving circuit includes a pixel active switch and a first pixel electrode, the control terminal of the pixel active switch is connected to the scan line, the input terminal of the pixel active switch is connected to a data line, and the output terminal of the pixel active switch is connected to the first pixel electrode, the first pixel electrode driving the sub-pixel unit to display; the self-refreshing driving circuit includes a pre-charge module, a self-refresh module, a data writing module, and a second pixel electrode, the pre-charge module is connected to the scan line and a first control signal, and raises the potential of the first node under the control of the scan line and the first control signal; the self-refresh module is connected to a second control signal, and under the control of the second control signal and the first node, transmits the second control signal to the data writing module, the data writing module, under the control of the second control signal, controls the data writing module to transmit the data signal on the data line to the second pixel electrode.

[0007] Optionally, the pre-charge module includes a first active switch, the control terminal of which is connected to the scan line, the output terminal of which is connected to the first node, and the input terminal of which is connected to the first control signal. When the first active switch is in the on state, the first control signal is transmitted to the first node. When the voltage of the first control signal is a first potential, the voltage of the first node is a first potential. When the potential of the first control signal is a second potential, the voltage of the first node is a second potential.

[0008] Optionally, the self-refresh driving circuit further includes a compensation module, which includes a second active switch. The control terminal and input terminal of the second active switch are respectively connected to the first control signal, and the output terminal of the second active switch is connected to the first node. The second active switch is turned on when the voltage of the first control signal is a first potential. The compensation module is used to transmit the first control signal to the first node when the first control signal is at the first potential.

[0009] Optionally, the compensation module further includes a third active switch, the control terminal of which is connected to the second control signal, the input terminal of which is connected to the output terminal of the second active switch, and the output terminal of which is connected to the first node; the output terminal of the second active switch is connected to the first node through the third active switch.

[0010] Optionally, the self-refresh module includes a fourth active switch, and the data writing module includes a fifth active switch; the control terminal of the fourth active switch is connected to the first node, the output terminal of the fourth active switch is connected to the second control signal, and the output terminal of the fourth active switch is connected to the control terminal of the fifth active switch; the input terminal of the fifth active switch is connected to the data line, and the output terminal of the fifth active switch is connected to the second pixel electrode.

[0011] Optionally, each pixel unit includes three sub-pixel units and one self-refreshing unit; each pixel unit is provided with three sub-pixel driving circuits and one self-refreshing driving circuit; each sub-pixel driving circuit drives one sub-pixel unit for display; the three sub-pixel driving circuits are respectively connected to three data lines, and the self-refreshing driving circuit is connected to any one of the three data lines.

[0012] Optionally, each pixel unit includes three sub-pixel units and three self-refreshing units; each pixel unit is provided with three sub-pixel driving circuits and three self-refreshing driving circuits; each sub-pixel driving circuit drives one sub-pixel to be displayed; each self-refreshing unit is arranged adjacent to one of the sub-pixel units.

[0013] Optionally, in adjacent self-refresh units and sub-pixel units, the sub-pixel driving circuit and the self-refresh driving circuit are connected to the same data line.

[0014] This application also discloses a display device, including a display panel, a driver chip, and a driving circuit for the display panel, wherein the driving circuit is disposed on the display panel, and the driver chip is used to provide a driving signal to the driving circuit so that the driving circuit drives the display panel to display.

[0015] In this application, by additionally setting a self-refresh unit in the pixel unit, the self-refresh unit displays the image when the sub-pixel unit is not in use, thus achieving a screen-off or static display mode. When the self-refresh unit is displaying, the sub-pixel unit does not need to participate in the display; it can be driven solely by the self-refresh driving circuit. This avoids using the sub-pixel driving circuit, saving power consumption from scanning and addressing, thereby achieving low-power screen-off or static display. Furthermore, by setting the self-refresh unit, the minimum frame rate can be lower than that using the sub-pixel driving circuit, achieving low-frame-rate screen-off or static display and improving the quality of the display panel. Attached Figure Description

[0016] The accompanying drawings, which form part of the specification, are used to provide a further understanding of the embodiments of this application and illustrate the implementation methods of this application, together with the textual description, to explain the principles of this application. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings: Figure 1 This is a schematic diagram of the display panel according to the first embodiment of this application; Figure 2 This is a schematic diagram of the driving circuit of the display panel according to the first embodiment of this application; Figure 3 This is a schematic diagram of the self-refresh driving circuit of the first embodiment of this application; Figure 4 This is a schematic diagram of the self-refresh driving circuit of the second embodiment of this application; Figure 5 This is a timing diagram of the first control signal and the second control signal of this application; Figure 6 This is a schematic diagram of the first pixel arrangement of the third embodiment of this application; Figure 7 This is a schematic diagram of the second pixel arrangement according to the third embodiment of this application; Figure 8 This is a schematic diagram of a third pixel arrangement according to a third embodiment of this application; Figure 9 This is a schematic diagram of the display device of this application.

[0017] Among them, 100 is the display panel; 110 is the driving circuit; 120 is the pixel unit; 121 is the sub-pixel unit; 122 is the self-refresh unit; Data is the data line; Scan is the scan line; 200 is the pixel driving circuit; 210 is the sub-pixel driving circuit; 212 is the first pixel electrode; 230 is the self-refresh driving circuit; 231 is the pre-charge module; 232 is the self-refresh module; 233 is the data writing module; 234 is the second pixel electrode; 235 is the compensation module; V_sel is the first control signal; V_data is the second control signal; T0 is the pixel active switch; T1 is the first active switch; T2 is the second active switch; T3 is the third active switch; T4 is the fourth active switch; T5 is the fifth active switch; T6 is the sixth active switch; T7 is the seventh active switch; T8 is the eighth active switch; C1 is the first capacitor; P is the first node; 300 is the display device; 310 is the driving chip. Detailed Implementation

[0018] It should be understood that the terminology, specific structural and functional details used herein are merely for describing particular embodiments and are representative. However, this application may be implemented in many alternative forms and should not be construed as being limited to the embodiments set forth herein.

[0019] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or implying the number of technical features indicated. Therefore, unless otherwise stated, a feature specified as "first" or "second" may explicitly or implicitly include one or more of that feature; "multiple" means two or more. Furthermore, terms such as "upper," "lower," "left," "right," "vertical," and "horizontal," indicating orientation or positional relationships, are based on the orientation or relative positional relationships shown in the accompanying drawings and are only for the purpose of simplifying the description of this application, not indicating that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0020] The present application will now be described in detail with reference to the accompanying drawings and optional embodiments.

[0021] Figure 1 This is a schematic diagram of the display panel according to the first embodiment of this application. Figure 2 This is a schematic diagram of the driving circuit of the display panel according to the first embodiment of this application. Figure 3 This is a schematic diagram of the self-refresh driving circuit of the first embodiment of this application, see below. Figures 1 to 3 As shown, this application discloses a driving circuit for a display panel 100. The display panel 100 includes a plurality of pixel units 120, and each pixel unit 120 includes a plurality of sub-pixel units 121. By combining the grayscale values ​​of the plurality of sub-pixel units 121 within the pixel unit 120, a single pixel unit 120 can display multiple colors and different grayscale values. A pixel driving circuit 200 is provided for each pixel unit 120, and the pixel driving circuit 200 drives the plurality of pixel units 120 for display.

[0022] The pixel unit 120 includes at least one sub-pixel unit 121 and at least one self-refresh unit 122; the pixel driving circuit 200 includes a sub-pixel driving circuit 210 and a self-refresh driving circuit 230; the display panel 100 includes a first display mode and a second display mode. In the first display mode, the sub-pixel driving circuit 210 drives the sub-pixel unit 121 to display; in the second display mode, the self-refresh driving circuit 230 drives the self-refresh unit 122 to display; wherein the second display mode is an always-on display or a static display mode.

[0023] In this application, by additionally setting a self-refresh unit 122 in the pixel unit 120, the self-refresh unit 122 displays the image when the sub-pixel unit 121 is not displaying, which is a screen-off display or static display mode. When the self-refresh unit 122 is displaying the image, the sub-pixel unit 121 does not need to participate in the display and can be driven independently by the self-refresh driving circuit 230, thereby avoiding the use of the sub-pixel driving circuit 210, saving the power consumption generated by scanning addressing, and thus realizing low-power screen-off or static display. Moreover, by setting the self-refresh unit 122, the minimum frame rate can be lower than the frame rate using the sub-pixel driving circuit 210, realizing low-frame-rate screen-off or static display, and improving the quality of the display panel 100.

[0024] Specifically, the display panel 100 designed in this application is a liquid crystal display panel 100, which includes two substrates and liquid crystal disposed on the two substrates. By setting a driving circuit on the substrate, the liquid crystal molecules are driven to deflect, thereby realizing the display of different brightness. The substrate where the driving circuit is located is generally called an array substrate, that is, the driving circuit of the display panel 100 mentioned in this application refers to the driving circuit part disposed on the array substrate of the display panel 100.

[0025] Specifically, the driving circuit further includes multiple data lines (Data) and multiple scan lines (Scan). The scan lines (Scan) provide scan signals for line-by-line scanning, and the data lines (Data) provide data signals for displaying different grayscale levels. Generally, multiple sub-pixel units 121 within the same pixel unit 120 are connected to the scan lines (Scan) and data lines (Data) in two ways. The first way is that multiple sub-pixel units 121 share the same scan line (Scan) but are connected to different data lines (Data). The second way is that multiple sub-pixel units 121 share the same data line (Data) but are connected to different scan lines (Scan). Through these two connection methods, different data signals can be provided to different sub-pixel units 121 simultaneously or in a time-division manner. This embodiment uses the example of multiple sub-pixel units 121 within the same pixel unit 120 being connected to the same scan line (Scan) for illustration.

[0026] The first display mode is the normal display mode, in which multiple sub-pixel units 121 are driven by the sub-pixel driving circuit 210 for display. The sub-pixel driving circuit 210 mainly uses a line-by-line scanning method, so that the sub-pixel driving circuit 210 connected to each scan line Scan transmits data signals to the sub-pixel units 121 respectively.

[0027] In this embodiment, each sub-pixel unit 121 is provided with a corresponding sub-pixel driving circuit 210. The sub-pixel driving circuit 210 is disposed within the range of each sub-pixel unit 121, generally within the non-opening area of ​​the sub-pixel unit 121. The sub-pixel driving circuit 210 includes a pixel active switch T0 and a first pixel electrode 212. The control terminal of the pixel active switch T0 is connected to the scan line Scan, the input terminal of the pixel active switch T0 is connected to a data line Data, and the output terminal of the pixel active switch T0 is connected to the first pixel electrode 212. The first pixel electrode 212 drives the sub-pixel unit 121 for display.

[0028] When the current scan line Scan is in scanning mode, the pixel active switch T0 connected to Scan is in the conducting state, and the data signal on the data line Data is transmitted to the first pixel electrode 212 through the pixel active switch T0. The first pixel electrode 212 is also provided with a pixel capacitor for storing the data signal, and is also provided with a common electrode. The electric field generated between the first pixel electrode 212 and the common electrode drives the liquid crystal molecules in the sub-pixel unit 121 to deflect, thereby performing display.

[0029] In the first display mode, the frame rate of the display panel 100 is related to the number of progressive scans. To change the refresh rate, the scan drive circuit needs to be controlled to complete a preset number of progressive scans within one second. When displaying 60 frames, it means that 60 complete progressive scans are completed within one second. Due to the limitation of the number of scan lines and the performance of the pixel active switch T0, it is difficult to reduce the frame rate of the liquid crystal display panel 100 to 1Hz to a few Hz. Moreover, even if the refresh rate is reduced, it is controlled by reducing the overall frame rate, making it difficult to achieve a low-power, low-refresh-rate display.

[0030] The self-refresh driving circuit 230 in this application is different from the sub-pixel driving circuit 210. It does not require line-by-line scanning control and can realize the display of the self-refresh unit 122 without the need for scanning signals.

[0031] Specifically, within a pixel unit 120, the sub-pixel driving circuit 210 and the self-refreshing driving circuit 230 are connected to the same scan line Scan. The self-refreshing driving circuit 230 includes a pre-charge module 231, a self-refreshing module 232, a data writing module 233, and a second pixel electrode 234. The pre-charge module 231 is connected to the scan line Scan and a first control signal V_sel, and raises the potential of the first node P under the control of the scan line Scan and the first control signal V_sel. The self-refreshing module 232 is connected to a second control signal V_data, and transmits the second control signal V_data to the data writing module 233 under the control of the second control signal V_data. Under the control of the second control signal V_data, the data writing module 233 controls the data signal on the data line Data to be transmitted to the second pixel electrode 234.

[0032] In this embodiment, the self-refresh driving circuit 230 uses the scan line Scan to control the pre-charge module 231. When the scan line Scan is open, it pre-charges the first node P to provide the potential of the first node P. Its first control signal V_sel is high when it charges the first node P. The self-refresh module 232 controls the data writing module 233 to operate based on the second control signal V_data and the potential of the first node P, thereby enabling the data signal to be written into the second pixel electrode 234 of the self-refresh unit 122.

[0033] The first control signal V_sel and the second control signal V_data are additionally configured logic signals. When at the operating level, they are considered logic 1, in which case the thin-film transistor connected to logic 1 is turned on; when at the non-operating level, they are considered logic 0, in which case the thin-film transistor connected to logic 1 is turned off. The data writing module 233 is generally connected to the data line Data. When the data writing module 233 is working normally, it writes the data signal to the second pixel electrode 234. Generally, the second pixel electrode 234 also has a corresponding pixel capacitor for storing the data signal. During the second display mode, the pixel capacitor discharges, allowing the second pixel electrode 234 to continuously control the deflection of the liquid crystal molecules.

[0034] The self-refreshing driving circuit 230 of this application is controlled by a first control signal V_sel and a second control signal V_data, without the need for control via scan lines (Scan) through line-by-line scanning. It is understood that the first control signal V_sel and the second control signal V_data are different from the scan signal and do not need to be provided by the scan driving circuit. Self-refreshing units 122 at different locations can each receive the same first control signal V_sel and the same second control signal V_data, thereby forming static display and always-on display. In other words, the self-refreshing driving circuit 230 in each pixel unit 120 is connected to the same first control signal V_sel and the same second control signal V_data. By connecting multiple self-refreshing driving circuits 230 to the same first control signal V_sel and the same second control signal V_data, the wiring layout is simplified. Moreover, the first control signal V_sel and the second control signal V_data can be provided by an external driving chip, and the refresh rate in always-on display or static display is controlled by controlling the duration of the first control signal V_sel and the second control signal V_data at their operating levels. For example, if the first control signal V_sel and the second control signal V_data are only at the working level once per second, then it is a 1Hz display, thus achieving low power consumption and low refresh rate display.

[0035] Specifically, the pre-charge module 231 includes a first active switch T1, the control terminal of the first active switch T1 is connected to the scan line Scan, the output terminal of the first active switch T1 is connected to the first node P, and the input terminal of the first active switch T1 is connected to the first control signal V_sel. When the first active switch T1 is in the on state, the first control signal V_sel is transmitted to the first node P. When the voltage of the first control signal V_sel is a first potential, the voltage of the first node P is a first potential. When the potential of the first control signal V_sel is a second potential, the voltage of the first node P is a second potential.

[0036] The pre-charging module 231 provided in this application mainly functions to refresh the potential of the first node P. When the display panel 100 is in the first display mode, although the first active switch T1 is in the conducting state under the action of the scanning signal, the first control signal V_sel is at a non-working level and cannot charge the first node P. When the first display mode is about to end, during the last round of progressive scanning, the first control signal V_sel can be changed to a high level in advance, thereby pre-charging the first node P.

[0037] Specifically, a first capacitor C1 is also provided at the position of the first node P. One end of the first capacitor C1 is connected to the first node P, and the other end of the first capacitor C1 is grounded or assigned a preset potential. The first capacitor C1 is mainly provided to maintain the potential of the first node P. Especially in the second display mode, the potential of the first node P is required to make the data writing module 233 work, thereby completing the data writing and display of the self-refresh unit 122.

[0038] See also Figure 3 As shown in this embodiment, in order to prevent the potential of the first node P from being unable to be maintained when displaying at a low refresh rate, a compensation module 235 is also provided at the location of the first node P to compensate for the potential of the first node P.

[0039] Specifically, the self-refresh driving circuit 230 further includes a compensation module 235, which includes a second active switch T2. The control terminal and input terminal of the second active switch T2 are respectively connected to the first control signal V_sel, and the output terminal of the second active switch T2 is connected to the first node P. The second active switch T2 is turned on when the voltage of the first control signal V_sel is at a first potential. The compensation module 235 is used to transmit the first control signal V_sel to the first node P when the first control signal V_sel is at the first potential.

[0040] In this embodiment, by controlling the frequency of the first control signal V_sel at its working and non-working levels, the data writing frequency in the second display mode can be controlled, thereby achieving a low refresh rate display. However, after the scan line Scan stops performing line-by-line scanning, the first active switch T1 will always be in the off state, and the first control signal V_sel cannot raise the potential of the first node P through the control of the first active switch T1. Therefore, in this embodiment, a second active switch T2 is set, with its control terminal and input terminal connected to the second control signal V_data respectively. When the second control signal V_data is at its working level, the second active switch T2 is turned on, transmitting the second control signal V_data to the first node P to raise the potential of the first node P.

[0041] It is understandable that, taking all active switches as N-type thin-film transistors as an example, their operating level is a logic high level, and their non-operating level is a logic low level, such as the first control signal V_sel, the second control signal V_data, and the active switches mentioned later. Taking the first control signal V_sel as an example, when it is at a logic low level, i.e., at the second potential, the second active switch T2 is in the off state. When the first control signal V_sel is at a logic high level, i.e., at the first potential, the second active switch T2 is in the on state.

[0042] Figure 4 This is a schematic diagram of the self-refresh driving circuit according to the second embodiment of this application. Figure 5 This is a timing diagram of the first control signal and the second control signal of this application. See [link / reference]. Figures 4 to 5 As shown, based on the compensation module 235 including the second active switch T2, this application also discloses another self-refresh driving circuit 230 architecture for the display panel 100. Specifically, the compensation module 235 further includes a third active switch T3, the control terminal of the third active switch T3 is connected to the second control signal V_data, the input terminal of the third active switch T3 is connected to the output terminal of the second active switch T2, and the output terminal of the third active switch T3 is connected to the first node P; the output terminal of the second active switch T2 is connected to the first node P through the third active switch T3.

[0043] In this scheme, based on the setting of the second active switch T2, the output terminal of the second active switch T2 is no longer connected to the first node P, but is instead connected to the second node via the third active switch T3. That is, when both the second active switch T2 and the third active switch T3 are at their operating levels, the second control signal V_data is transmitted to the first node P through the second active switch T2 and the third active switch T3. In the second display mode, by controlling the switching between the operating and non-operating states of the second control signal V_data and the third control signal, the data signal is written to the second pixel electrode 234 of the self-refresh unit 122. The functions of the second active switch T2 and the third active switch T3 also include preventing a long interval from causing the potential of the first node P to drop due to leakage current from the first active switch T1, ultimately leading to the inability to control the data writing module 233 to operate.

[0044] It is worth mentioning that after switching from the second display mode to the first display mode, when the scan line Scan performs line-by-line scanning, the first active switch T1 is turned on under the action of the scan signal. At this time, the second control signal V_data is controlled at a non-working level, that is, a logic low level, thereby pulling the potential of the first node P low and completing the reset.

[0045] Of course, in this embodiment, the second active switch T2 and the third active switch T3 can also be used individually, without needing to be combined. The potential of the first node P can be boosted by the first control signal V_sel and the second control signal V_data, respectively, or by a combination of the first control signal V_sel and the second control signal V_data. When using the second active switch T2 or the third active switch T3, the output terminal of the second active switch T2 or the output terminal of the third active switch T3 is connected to the first node P, and the input and control terminals of the second active switch T2 and the third active switch T3 are respectively connected to the first control signal V_sel or the input and control terminals of the third active switch T3 are respectively connected to the second control signal V_data. It is worth mentioning that when the second active switch T2 and the third active switch T3 are used in combination, when the first control signal V_sel and the second control signal V_data are both at a logic high level, the second active switch T2 and the third active switch T3 are turned on, providing a pull-up potential for the first node P. When the second control signal V_data is at a logic low level, the first control signal V_sel cannot be transmitted to the first node P, and when the second control signal V_data is at a logic low level, the data writing module 233 cannot write data, thereby achieving low refresh rate display.

[0046] Specifically, the self-refresh module 232 includes a fourth active switch T4, and the data writing module 233 includes a fifth active switch T5; the control terminal of the fourth active switch T4 is connected to the first node P, the output terminal of the fourth active switch T4 is connected to the second control signal V_data, and the output terminal of the fourth active switch T4 is connected to the control terminal of the fifth active switch T5; the input terminal of the fifth active switch T5 is connected to the data line Data, and the output terminal of the fifth active switch T5 is connected to the second pixel electrode 234.

[0047] In this embodiment, the fourth active switch T4 is controlled by the potential of the first node P, and the fourth active switch T4, when turned on, transmits the second control signal V_data to the control terminal of the fifth active switch T5. Therefore, the control terminal of the fifth active switch T5 is actually affected by both the first control signal V_sel and the second control signal V_data, but its primary determining factor is the second control signal V_data. When the second control signal V_data is at a logic high level, the fifth active switch T5 is turned on, thereby enabling the writing of data signals. When the second control signal V_data is at a logic low level, the fifth active switch T5 is turned off, and data signals are no longer written. When the next second control signal V_data is at a logic high level, the fifth active switch T5 is turned on again. Therefore, by controlling the second control signal V_data to switch between logic high and logic low levels, the signal switching of the second pixel electrode 234 of the self-refresh unit 122 is achieved, thereby controlling the display refresh rate.

[0048] Figure 6 This is a schematic diagram of the first pixel arrangement of the third embodiment of this application, see [link / reference]. Figure 6 As shown, based on any of the above embodiments, this embodiment further limits the arrangement of the sub-pixel units 121 and the self-refresh unit 122 within the pixel unit 120.

[0049] Specifically, each pixel unit 120 includes three sub-pixel units 121 and one self-refreshing unit 122; each pixel unit 120 is provided with three sub-pixel driving circuits 210 and one self-refreshing driving circuit 230; each sub-pixel driving circuit 210 drives one sub-pixel to be displayed.

[0050] In this embodiment, a self-refreshing unit 122 is provided within a pixel unit 120. The color of the self-refreshing unit 122 can be any color, such as red, green, blue, or white. The three sub-pixel units 121 within the pixel unit 120 are red, green, and blue, respectively, thus combining the three sub-pixel units 121 to create various colors. When performing the screen-off display in the second display mode, since only one self-refreshing unit 122 is provided within a pixel unit 120, a new pixel unit 120 can be formed by combining the self-refreshing units 122 of multiple pixel units 120 for display. Although the resolution is reduced, it is clear enough for the static display or screen-off display in the second display mode.

[0051] In this embodiment, the three sub-pixel driving circuits 210 are respectively connected to the three data lines Data, and can be connected to another data line Data, so that the pixel unit 120 is provided with four data lines Data and one scan line Scan.

[0052] Figure 7 This is a schematic diagram of the second pixel arrangement of the third embodiment of this application, see [link / reference]. Figure 7 As shown, in another embodiment, the self-refresh driving circuit 230 is connected to any one of the three data lines Data corresponding to the three sub-pixel units 121 in the same pixel unit 120. In the second display mode, the data signal on the data line Data is mainly provided to the self-refresh unit 122 for display, and there is no need to increase the number of data lines Data. Of course, the self-refresh driving circuit 230 can also be connected to the above three data lines Data through three active switches respectively. The three active switches can be divided into a sixth active switch T6, a seventh active switch T7, and an eighth active switch T8. The input terminals of the three are respectively connected to the above three data lines Data, and the control terminals of the three are interconnected with the input terminals, so that data signals can be output to the self-refresh unit 122 from any one of the three data lines Data.

[0053] It is understood that all self-refreshing units 122 connected to the same data line Data in this application receive the same data signal, which is suitable for monochrome display, such as clock display, and the screen-off display of the liquid crystal display panel 100 is realized through the self-refreshing unit 122.

[0054] Figure 8 This is a schematic diagram of the third pixel arrangement of the third embodiment of this application, see [link / reference]. Figure 8 As shown, in another embodiment, each pixel unit 120 includes three sub-pixel units 121 and three self-refreshing units 122; each pixel unit 120 is provided with three sub-pixel driving circuits 210 and three self-refreshing driving circuits 230; each sub-pixel driving circuit 210 drives one sub-pixel to be displayed; each self-refreshing unit 122 is arranged adjacent to one sub-pixel unit 121.

[0055] In this embodiment, each pixel unit 120 is further provided with three self-refreshing units 122, the colors of which are red, green and blue, respectively, corresponding to the color settings of the three sub-pixel units 121. By setting three different colored self-refreshing units 122, more complex images can be displayed in the second display mode, that is, better display effect in the always-on display mode.

[0056] Specifically, in adjacent self-refresh units 122 and sub-pixel units 121, the sub-pixel driving circuit 210 and the self-refresh driving circuit 230 are connected to the same data line. In other words, when the three sub-pixel units 121 are red, green, and blue sub-pixel units 121 respectively, the self-refresh units 122 are respectively configured with red, green, and blue self-refresh units 122. Specifically, red sub-pixel units 121 and red self-refresh units 122 are arranged adjacent to each other, green sub-pixel units 121 and green self-refresh units 122 are arranged adjacent to each other, and blue sub-pixel units 121 and blue self-refresh units 122 are arranged adjacent to each other. Correspondingly, the sub-pixel driving circuit 210 of the red sub-pixel unit 121 and the self-refresh driving circuit 230 of the red self-refresh unit 122 are connected to the same data line Data; the sub-pixel driving circuit 210 of the green sub-pixel unit 121 and the self-refresh driving circuit 230 of the green self-refresh unit 122 are connected to the same data line Data; and the sub-pixel driving circuit 210 of the blue sub-pixel unit 121 and the self-refresh driving circuit 230 of the blue self-refresh unit 122 are connected to the same data line Data.

[0057] In one specific embodiment, the area of ​​the self-refresh unit 122 is smaller than the area of ​​the sub-pixel unit 121. In other words, the area of ​​the second pixel electrode 234 of the self-refresh unit 122 is smaller than the area of ​​the first pixel electrode 212 of the sub-pixel unit 121.

[0058] Figure 9 This is a schematic diagram of the display device of this application, see [link / reference]. Figure 9 As shown, this application also discloses a display device 300, which includes a display panel 100, a driver chip 310, and a driver circuit 110 for the display panel 100 as mentioned in any of the above embodiments. The driver circuit 110 is disposed on the display panel 100, and the driver chip is used to provide a drive signal to the driver circuit 110 so that the driver circuit 110 drives the display panel 100 to display.

[0059] It should be noted that the inventive concept of this application can form many embodiments, but due to the limited space of the application documents, they cannot all be listed. Therefore, without conflict, the embodiments described above or the technical features can be arbitrarily combined to form new embodiments. After the embodiments or technical features are combined, the original technical effect will be enhanced.

[0060] The above description, in conjunction with specific optional embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications or substitutions should be considered within the scope of protection of this application.

Claims

1. A driving circuit for a display panel, the display panel comprising a plurality of pixel units, the driving circuit comprising a plurality of pixel driving circuits, wherein the plurality of pixel driving circuits are respectively used to drive the plurality of pixel units, characterized in that, The pixel unit includes at least one sub-pixel unit and at least one self-refreshing unit; the pixel driving circuit includes a sub-pixel driving circuit and a self-refreshing driving circuit. The display panel includes a first display mode and a second display mode. In the first display mode, the sub-pixel driving circuit drives the sub-pixel unit to display; in the second display mode, the self-refreshing driving circuit drives the self-refreshing unit to display. The second display mode is either always-on display or static display mode.

2. The driving circuit for the display panel according to claim 1, characterized in that, The driving circuit also includes multiple data lines and multiple scan lines; Within one pixel unit, the sub-pixel driving circuit and the self-refreshing driving circuit are connected to the same scan line; The sub-pixel driving circuit includes a pixel active switch and a first pixel electrode. The control terminal of the pixel active switch is connected to the scan line, the input terminal of the pixel active switch is connected to a data line, and the output terminal of the pixel active switch is connected to the first pixel electrode. The first pixel electrode drives the sub-pixel unit to be displayed. The self-refresh driving circuit includes a pre-charge module, a self-refresh module, a data writing module, and a second pixel electrode. The pre-charge module is connected to the scan line and the first control signal, and increases the potential of the first node under the control of the scan line and the first control signal. The self-refresh module is connected to the second control signal, and under the control of the second control signal and the first node, it transmits the second control signal to the data writing module. Under the control of the second control signal, the data writing module controls the data signal on the data line to be transmitted to the second pixel electrode.

3. The driving circuit for the display panel according to claim 2, characterized in that, The pre-charge module includes a first active switch, the control terminal of the first active switch is connected to the scan line, the output terminal of the first active switch is connected to the first node, and the input terminal of the first active switch is connected to the first control signal. When the first active switch is in the ON state, the first control signal is transmitted to the first node; When the voltage of the first control signal is at the first potential, the voltage of the first node is at the first potential; When the potential of the first control signal is the second potential, the voltage of the first node is the second potential.

4. The driving circuit for the display panel according to claim 3, characterized in that, The self-refresh driving circuit also includes a compensation module, which includes a second active switch. The control terminal and input terminal of the second active switch are respectively connected to the first control signal, and the output terminal of the second active switch is connected to the first node. The second active switch is turned on when the voltage of the first control signal is a first potential. The compensation module is used to transmit the first control signal to the first node when the first control signal is at the first potential.

5. The driving circuit for the display panel according to claim 4, characterized in that, The compensation module further includes a third active switch, the control terminal of which is connected to the second control signal, the input terminal of which is connected to the output terminal of the second active switch, and the output terminal of which is connected to the first node; The output of the second active switch is connected to the first node through the third active switch.

6. The driving circuit for the display panel according to claim 3, characterized in that, The self-refresh module includes a fourth active switch, and the data writing module includes a fifth active switch; The control terminal of the fourth active switch is connected to the first node, the output terminal of the fourth active switch is connected to the second control signal, and the output terminal of the fourth active switch is connected to the control terminal of the fifth active switch. The input terminal of the fifth active switch is connected to the data line, and the output terminal of the fifth active switch is connected to the second pixel electrode.

7. The driving circuit for the display panel according to claim 2, characterized in that, Each pixel unit includes three sub-pixel units and one self-refreshing unit; Each pixel unit is provided with three sub-pixel driving circuits and one self-refreshing driving circuit; each sub-pixel driving circuit drives one sub-pixel unit for display. The three sub-pixel driving circuits are respectively connected to the three data lines, and the self-refresh driving circuit is connected to any one of the three data lines.

8. The driving circuit for the display panel according to claim 2, characterized in that, Each pixel unit includes three sub-pixel units and three self-refreshing units; Each pixel unit is provided with three sub-pixel driving circuits and three self-refreshing driving circuits; Each of the sub-pixel driving circuits drives one of the sub-pixel displays; each of the self-refreshing units is arranged adjacent to one of the sub-pixel units.

9. The driving circuit for the display panel according to claim 7, characterized in that, In adjacent self-refresh units and sub-pixel units, the sub-pixel driving circuit and the self-refresh driving circuit are connected to the same data line.

10. A display device, characterized in that, The device includes a display panel, a driver chip, and a driving circuit for the display panel as described in any one of claims 1-9, wherein the driving circuit is disposed on the display panel, and the driver chip is used to provide a driving signal to the driving circuit so that the driving circuit drives the display panel to display.

Images