CN111798806B

CN111798806B - Scanning driving circuit, display panel, driving method of display panel and display device

Info

Publication number: CN111798806B
Application number: CN202010618313.9A
Authority: CN
Inventors: 金慧俊
Original assignee: Shanghai AVIC Optoelectronics Co Ltd
Current assignee: Shanghai AVIC Optoelectronics Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2022-03-29
Anticipated expiration: 2040-06-30
Also published as: CN111798806A

Abstract

The invention discloses a scanning driving circuit, a display panel, a driving method thereof and a display device, belonging to the technical field of display, wherein the scanning driving circuit comprises a plurality of cascaded scanning driving units, and each scanning driving unit comprises a selection module and a shift driving module; the selection module comprises a first transistor, a second transistor, a first capacitor, a first signal input end, a second signal input end and a third signal input end; the shift driving module comprises a starting signal input end, a termination signal input end and an output end. The display panel comprises the scanning driving circuit. The driving method of the display panel comprises a normal display mode and a message screen display mode. The display device comprises a backlight module and the display panel which are oppositely arranged. The invention can trigger a certain level of displacement driving module to start scanning driving work when the local display is performed, which is beneficial to reducing power consumption, and the selection freedom of the local display is high, the design is reasonable, and the operation is simple.

Description

Scanning driving circuit, display panel, driving method of display panel and display device

Technical Field

The invention relates to the technical field of display, in particular to a scanning driving circuit, a display panel, a driving method of the display panel and a display device.

Background

In the field of Display technology, Thin Film Transistor-Liquid Crystal displays (TFT-LCDs) and Active Matrix Driving organic light emitting diode displays (AMOLEDs) are increasingly used in the field of high performance displays due to their characteristics of small size, low power consumption, no radiation, relatively low manufacturing cost, etc.

In the display device, each pixel in the panel is generally driven by a driving circuit to perform display. The driving circuit mainly comprises a grid driving circuit and a data driving circuit. The data driving circuit is used for latching input data and a clock signal in a timing sequence, converting the latched data into an analog signal and inputting the analog signal to a data line of the panel. The gate driving circuit is used to convert a clock signal into an on/off voltage through a Shift Register (SR), and output the on/off voltage to each gate line of the panel. The grid driving circuit comprises a plurality of shift register units, wherein the output end of each shift register unit is connected with a row of grid lines and used for outputting grid scanning signals to the grid lines so as to realize the line-by-line scanning of the grid lines. Besides, the output ends of the other shift register units except the last shift register unit need to be connected with the input end of the next shift register unit. With the development of application technologies, people have increasingly high requirements on low power consumption performance of display devices.

In the prior art, only an active matrix driving organic light emitting diode display usually supports information screen display. The screen-off display means that the display screen can display some simple pictures, such as LOGO, time and other information, in the screen-locked and non-display states of the display screen. In this state, the power consumption of the display screen is about 16 mW. Taking an amorphous silicon Liquid Crystal Display (LCD) panel as an example, the backlight generally requires about 120mW of power consumption, the gate driving Circuit generally requires about 50mW of power consumption, and the driving chip (IC) generally requires about 70mW of power consumption. Therefore, if the amorphous silicon LCD panel needs to display graphics in the breath screen state, there will be power consumption of about 240mW, which is disadvantageous for the display screen endurance.

Therefore, it is an urgent need to solve the technical problems in the art to provide a scan driving circuit, a display panel, a driving method thereof, and a display device capable of reducing power consumption of a display screen when displaying a partial screen.

Disclosure of Invention

In view of this, the present invention provides a scan driving circuit, a display panel, a driving method thereof, and a display device, so as to solve the problem that the display device in the prior art has high power consumption when displaying a local screen, which is not beneficial to improving user experience.

The invention discloses a scanning driving circuit, which comprises a plurality of cascaded scanning driving units, wherein each scanning driving unit comprises a selection module and a shift driving module; the selection module comprises a first transistor, a second transistor, a first capacitor, a first signal input end, a second signal input end and a third signal input end; the shift driving module comprises a starting signal input end, a termination signal input end and an output end; the grid electrode of a first transistor of the selection module is electrically connected with a first end of a first capacitor, a first pole of the first transistor is electrically connected with a first signal input end, and a second pole of the first transistor is electrically connected with an initial signal input end of the shift driving module; the grid electrode of the second transistor of the selection module is electrically connected with the second signal input end, the first pole of the second transistor is electrically connected with the second end of the first capacitor, and the second pole of the second transistor of the selection module is electrically connected with the output end of the shift driving module; and the third signal input end of the selection module is electrically connected with the termination signal input end of the shift driving module.

Based on the same inventive concept, the invention also discloses a display panel, which comprises the scanning driving circuit, a plurality of scanning lines arranged along the second direction and extending along the first direction, a plurality of data lines arranged along the first direction and extending along the second direction, and a plurality of sub-pixels arranged in an array, wherein each sub-pixel is respectively and correspondingly connected with the scanning lines and the data lines; the output end of each stage of the shift driving module is electrically connected with each scanning line in a one-to-one correspondence mode.

Based on the same inventive concept, the invention also discloses a driving method of the display panel, which is used for driving the display panel to work; the driving method of the display panel comprises a normal display mode and a message screen display mode; in a normal display mode, each stage of scanning drive unit of the scanning drive circuit provides scanning drive signals for scanning lines, and the data lines provide data voltage signals for the sub-pixels; in the information screen display mode, each stage of scanning drive unit of the scanning drive circuit provides scanning drive signals for scanning lines, and the data lines do not provide data voltage signals; if the sub-pixels in the row a to the sub-pixels in the row b need to be displayed by the information screen, then: when the scanning driving circuit works to the a-th scanning driving unit, the selection module of the a-th scanning driving unit starts to work, the data line synchronously provides a data voltage signal, and the sub-pixels in the a-th row and the sub-pixels in the b-th row start to display the picture in sequence; after the scanning driving circuit works to the b-th stage scanning driving unit, the selection module of the b + 1-th stage scanning driving unit stops working, the data line synchronously stops providing data voltage signals, and the sub-pixels of the b +1 th row start not to display the picture; wherein a and b are positive integers and b is greater than a.

Based on the same inventive concept, the invention also discloses a display device, which comprises a backlight module and the display panel which are oppositely arranged.

Compared with the prior art, the scanning driving circuit, the display panel, the driving method thereof and the display device provided by the invention at least realize the following beneficial effects:

the scanning drive circuit provided by the invention comprises a plurality of cascaded scanning drive units, each scanning drive unit comprises a selection module and a shift drive module, namely each cascaded shift drive module is connected with the selection module, the selection module is used for selecting and exciting the shift drive module of a certain stage to start scanning charging work so as to trigger the shift drive module of the stage or stages to carry out scanning drive work, thus when a display panel applying the scanning drive circuit needs to locally display a picture, the shift drive module of the stage or stages is started to carry out scanning drive work by feeding a start signal to a first signal input end and a second signal input end of the selection module connected with the shift drive module of the certain stage, and when the scanning drive work is stopped after the shift drive module of the certain stage is required, only a stop signal is fed to a third signal input end of the selection module, the one-stage or multi-stage displacement driving module at any position in the display panel can be controlled to carry out scanning driving work. When the scanning driving circuit provided by the invention is applied to the display panel, when the display panel needs to display a picture locally, only a certain level of displacement driving module is triggered to start scanning driving work, and all levels of displacement driving modules are not required to perform scanning driving work, so that the power consumption is reduced, the one-level or multi-level displacement driving module at any position in the display panel can be controlled randomly to perform scanning driving work, the selection freedom degree of local display is high, the design is reasonable, and the operation is simple.

Of course, it is not necessary for any product in which the present invention is practiced to specifically achieve all of the above-described technical effects simultaneously.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic diagram of a connection structure of a scan driving circuit according to an embodiment of the present invention;

FIG. 2 is a schematic view of a connection structure of a plurality of cascaded scan driving units partially shown in FIG. 1;

FIG. 3 is a driving timing diagram of the scan driving circuit of FIG. 1;

fig. 4 is another driving timing diagram of the scan driving circuit of fig. 1;

FIG. 5 is a schematic diagram of a connection structure of another scan driving circuit according to an embodiment of the present invention;

fig. 6 is a schematic circuit connection structure diagram of a shift driving module according to an embodiment of the present invention;

fig. 7 is a schematic circuit connection structure diagram of another shift driving module according to an embodiment of the present invention;

fig. 8 is a schematic circuit connection structure diagram of another shift driving module according to an embodiment of the present invention;

fig. 9 is a schematic circuit connection structure diagram of another shift driving module according to an embodiment of the present invention;

FIG. 10 is a timing diagram of the signals of the shift driving module shown in FIG. 8 or FIG. 9;

FIG. 11 is a schematic diagram of a connection structure of another scan driving circuit according to an embodiment of the present invention;

fig. 12 is a schematic plan view illustrating a display panel according to an embodiment of the present invention;

FIG. 13 is a schematic diagram of a partially enlarged structure of the scan driving circuit in FIG. 12;

fig. 14 is a flowchart of a driving method of the display panel of fig. 12;

fig. 15 is a schematic plan view of a display device according to an embodiment of the present invention;

FIG. 16 is a schematic cross-sectional view of FIG. 15;

FIG. 17 is a schematic plan view of the backlight module shown in FIG. 16;

fig. 18 is a schematic plan view of another display device according to an embodiment of the present invention;

fig. 19 is a schematic plan view of another display device according to an embodiment of the present invention;

fig. 20 is a schematic plan view of another display device according to an embodiment of the present invention;

fig. 21 is a schematic plan view of another display device according to an embodiment of the present invention.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Referring to fig. 1, fig. 1 is a schematic diagram of a connection structure of a scan driving circuit according to an embodiment of the present invention, where the scan driving circuit 000 includes a plurality of cascaded scan driving units 100, and each scan driving unit 100 includes a selection module 10 and a shift driving module 20;

the selection module 10 includes a first transistor T01, a second transistor T02, a first capacitor C01, a first signal input terminal stv, a second signal input terminal select, and a third signal input terminal stvb; optionally, the first signal input terminals stv of all the selection modules 10 are connected to a first signal bus stv-charge, the second signal input terminals select of all the selection modules 10 are connected to a second signal bus select-charge, and the third signal input terminals stvb of all the selection modules 10 are connected to a third signal bus stvb-charge;

the shift driving module 20 includes a start signal input terminal STV, a stop signal input terminal STVB, and an output terminal Gout;

a gate of the first transistor T01 of the selection module 10 is electrically connected to a first end of the first capacitor C01, a first pole of the first transistor is electrically connected to the first signal input terminal STV, and a second pole of the first transistor is electrically connected to the start signal input terminal STV of the shift driving module 20;

the gate of the second transistor T02 of the selection module 10 is electrically connected to the second signal input terminal select, the first pole is electrically connected to the second end of the first capacitor C01, and the second pole is electrically connected to the output terminal Gout of the shift driving module 20;

the third signal input terminal STVB of the selection block 10 is electrically connected to the termination signal input terminal STVB of the shift driving block 20.

Specifically, the scan driving circuit provided in this embodiment includes a plurality of cascaded scan driving units 100, each scan driving unit 100 includes a selection module 10 and a shift driving module 20, that is, each cascaded shift driving module 20 is connected to the selection module 10, the selection module 10 is configured to selectively activate a shift driving module 20 of a certain stage to start a scan charging operation, so as to trigger the shift driving module 20 of the one stage or multiple stages to perform a scan driving operation, so that when a display panel using the scan driving circuit 000 needs to display a picture locally, the shift driving module 20 of the one stage or multiple stages is activated by providing a first signal input stv and a second signal input select start signal of the selection module 10 connected to the shift driving module 20 of the certain stage, and when the scan driving operation is required to be performed to the shift driving module 20 of the certain stage and then the scan is terminated, only need to give into a termination signal of third signal input end stvb of selection module 10, can control the one-level or multistage displacement drive module 20 of optional position in the display panel at will to scan drive work, when the scanning drive circuit 000 that this embodiment provided is applied to the display panel, can be when the display panel needs the local display picture, only trigger the displacement drive module 20 of a certain level to begin to scan drive work can, it all carries out the scanning drive work to need not all the displacement drive modules 20 of rank, be favorable to reducing the power consumption, and can control the one-level or multistage displacement drive module 20 of optional position in the display panel at will to scan drive work, the selection degree of freedom of local display is high, reasonable in design easy operation.

Optionally, please refer to fig. 2, fig. 3 and fig. 4 in combination, fig. 2 is a schematic diagram of a connection structure of a plurality of local cascaded scan driving units in fig. 1, fig. 3 is a driving timing diagram of the scan driving circuit in fig. 1, fig. 4 is another driving timing diagram of the scan driving circuit in fig. 1, as shown in fig. 2, if the scan driving circuit 000 in fig. 1 of this embodiment is applied to a display panel, a local display frame needs to be performed at 501-600 th row, that is, in the plurality of cascaded scan driving units 100, a start signal of the selection module 10 in the 501-th scan driving unit 100 needs to be given to trigger the 501-600-th scan driving unit 100 to perform the scan driving operation, and when the scan driving operation is performed to the 600-th scan driving unit 100, by giving a termination signal to the third signal input stvb of the selection module 10 of the 601-th scan driving unit 100, the scanning operation can be terminated to complete the local display in the breath screen state, and the timing diagram of the driving of the local display in the breath screen state is shown in fig. 3 and 4:

in a first frame time (a frame time refers to a time interval between two times of scanning the preset region by the gate line) in the breath screen state, all the scanning driving units 100 normally work, but the data lines do not provide signals, and the picture does not display contents;

in the clear state of the first frame, the second signal bus select-charge is fed with a high voltage, and since the output terminals Gout of all the shift driving modules 20 are at a low voltage, the charges in the first capacitors C01 of all the selection modules 10 are cleared. Meanwhile, the first signal bus stv-charge is at a low potential;

in the normal operation state of all the scan driving units 100, a select-charge low voltage is applied to the second signal bus until the scan driving operation of the 500 th scan driving unit 100 is finished, and the scan driving operation proceeds to the 501 th scan driving unit 100;

when the output terminal Gout of the 501 st stage shift driver block 20 outputs a signal, the second signal bus select-charge is synchronously asserted high, so that the first capacitor C01 of the 501 st stage select block 10 is charged, and the first transistor T01 of the 501 st stage select block 10 is turned on. When the output of the output terminal Gout of the 501 th stage shift driving module 20 is finished, the second signal bus select-charge is synchronously pulled low;

the scan driving unit 100 after the 501 th stage continues to operate until the first frame is finished.

At the beginning of the second frame, a high voltage of the first signal bus STV-charge is applied, and since the first transistor T01 of the selection module 10 of the 501 th stage is in an on state, the high voltage of the first signal bus STV-charge is transmitted to the start signal input terminal STV of the shift driving module 20 of the 501 th stage through the first transistor T01, the start signal input terminal STV of the shift driving module 20 of the 501 th stage becomes a high voltage, a charging node inside the shift driving module 20 of the 501 th stage is charged, and thus the scan driving circuit 000 starts to operate from the shift driving module 20 of the 501 th stage;

meanwhile, when the output end Gout of the 501 th-stage shift driving module 20 is output, a high potential of a select-charge of the second signal bus is given, and when the output end Gout of the 501 th-stage shift driving module 20 is ended, the select-charge of the second signal bus is pulled down, and the first capacitor C01 of the 501 th-stage selection module 10 is charged again to prepare for the screen saver display of the next frame;

when the 501 st-600 th-level scanning driving unit 100 in the information screen state performs scanning driving, the data lines synchronously output signals to enable the display panel to display contents at corresponding positions;

when the scanning driving operation is performed to the 600 th scanning driving unit 100, a high potential of the third signal bus STVB-charge is applied, and the high potential of the third signal bus STVB-charge is transmitted to the termination signal input terminals STVB of all the shift driving modules 20, so that after the 600 th scanning driving unit 100 finishes the operation, the charges of the charging nodes in all the shift driving modules 20 are released, and all the shift driving modules 20 are turned off and do not work any more. At which point the second frame (snap display) ends.

The third frame starts as long as the second frame is repeated.

It can be understood that, when the scan driving circuit 000 of the present embodiment is applied to a display panel, a continuous multi-stage scan driving unit 100 corresponding to one display region of a display screen may be selected for local display, and a plurality of display regions of the display screen may be selected for local display, where each region corresponds to a continuous multi-stage scan driving unit 100. Optionally, as shown in fig. 5, fig. 5 is a schematic diagram of a connection structure of another scan driving circuit according to an embodiment of the present invention, when the scan driving circuit in fig. 5 is applied to a display panel to perform a storage screen display, since the third signal bus stvb-charge will empty charges of charging nodes in all the shift driving modules 20 after the last stage of scan driving unit 100 corresponding to a storage screen display region finishes working, if there are two or more storage screen display regions, two or more first signal buses stv-charge are required. For example, taking two message screen display areas as an example, the first signal input terminals stv of the selection modules 10 corresponding to the first message screen display area are all connected to the first sub-signal bus stv-charge1, the first signal input terminals stv of the selection modules 10 corresponding to the second message screen display area are all connected to the second sub-signal bus stv-charge2, and so on. Each osd region is finished displaying, and it is necessary to empty all the charge nodes in the shift driving module 20 of charges through the third signal bus stvb-charge.

It should be noted that, in each transistor of this embodiment, an N-type transistor (when a high potential is applied to a gate, the transistor is turned on) is taken as an example to illustrate the operating principle of this embodiment, and in specific implementation, each transistor may also be a P-type transistor (when a low potential is applied to a gate, the transistor is turned on).

In some alternative embodiments, please refer to fig. 1-4 and fig. 6 in combination, fig. 6 is a schematic circuit connection structure diagram of a shift driving module according to an embodiment of the present invention, in which the shift driving module 20 further includes at least a third transistor T03, a fourth transistor T04, and a charging node P; the third transistor T03 and the fourth transistor T04 are electrically connected to the charging node P, the gate of the third transistor T03 is electrically connected to the start signal input terminal STV, and the gate of the fourth transistor T04 is electrically connected to the termination signal input terminal STVB. A first pole of the third transistor T03 is electrically connected to the start signal input terminal STV, and a second pole of the third transistor T03 is electrically connected to the charging node P; a first pole of the fourth transistor T04 is electrically connected to the low voltage signal terminal VGL, and a second pole of the fourth transistor T04 is electrically connected to the charging node P.

The present embodiment further explains that when the shift driving module 20 of a certain stage is triggered to start operating by supplying the high voltage of the first signal bus STV-charge, since the first transistor T01 of the selection module 10 of the stage is in an on state, the high voltage of the first signal bus STV-charge is transmitted to the start signal input terminal STV of the shift driving module 20 of the stage through the first transistor T01, the start signal input terminal STV of the shift driving module 20 of the stage becomes the high voltage, the third transistor T03 is turned on, the high voltage of the start signal input terminal STV connected to the first pole of the third transistor T03 is synchronously transmitted to the charging node P, and the internal of the shift driving module 20 of the stage is charged through the charging node P to complete the scanning driving operation. When the scanning driving operation is performed to a certain stage of the scanning driving unit 100 and the operation needs to be terminated, after the stage of the scanning driving unit 100 finishes the operation, the high potential of the third signal bus STVB-charge is fed, the high potential of the third signal bus STVB-charge is transmitted to the termination signal input terminals STVB of all the shift driving modules 20, the fourth transistor T04 is turned on, the low potential of the low voltage signal terminal VGL connected to the first electrode of the fourth transistor T04 is synchronously transmitted to the charging node P, so that the charges of the charging node P in all the shift driving modules 20 are released, and all the shift driving modules 20 are turned off and do not work any more.

In some alternative embodiments, please refer to fig. 1-4 and fig. 7 in combination, fig. 7 is a schematic circuit connection structure diagram of another shift driving module according to an embodiment of the present invention, in which the shift driving module 20 further includes at least a third transistor T03, a fourth transistor T04, and a charging node P; the third transistor T03 and the fourth transistor T04 are electrically connected to the charging node P, the gate of the third transistor T03 is electrically connected to the start signal input terminal STV, and the gate of the fourth transistor T04 is electrically connected to the termination signal input terminal STVB. A first pole of the third transistor T03 is electrically connected to the high voltage signal terminal VGH, and a second pole of the third transistor T03 is electrically connected to the charging node P; a first pole of the fourth transistor T04 is electrically connected to the low voltage signal terminal VGL, and a second pole of the fourth transistor T04 is electrically connected to the charging node P.

The present embodiment further explains that when the shift driving module 20 of a certain stage is triggered to start operating by feeding the high voltage of the first signal bus STV-charge, since the first transistor T01 of the selection module 10 of the stage is in an on state, the high voltage of the first signal bus STV-charge is transmitted to the start signal input terminal STV of the shift driving module 20 of the stage through the first transistor T01, the start signal input terminal STV of the shift driving module 20 of the stage becomes the high voltage, the third transistor T03 is turned on, the high voltage of the high voltage signal terminal VGH connected to the first pole of the third transistor T03 is synchronously transmitted to the charging node P, and the internal of the shift driving module 20 of the stage is charged through the charging node P to complete the scanning driving operation. When the scanning driving operation is performed to a certain stage of the scanning driving unit 100 and the operation needs to be terminated, after the stage of the scanning driving unit 100 finishes the operation, the high potential of the third signal bus STVB-charge is fed, the high potential of the third signal bus STVB-charge is transmitted to the termination signal input terminals STVB of all the shift driving modules 20, the fourth transistor T04 is turned on, the low potential of the low voltage signal terminal VGL connected to the first electrode of the fourth transistor T04 is synchronously transmitted to the charging node P, so that the charges of the charging node P in all the shift driving modules 20 are released, and all the shift driving modules 20 are turned off and do not work any more.

Optionally, please refer to fig. 1, fig. 6-fig. 7, fig. 8, fig. 9 and fig. 10 in combination, where fig. 8 is a schematic circuit connection structure of another shift driving module according to an embodiment of the present invention, fig. 9 is a schematic circuit connection structure of another shift driving module according to an embodiment of the present invention, fig. 10 is a control timing diagram of each signal terminal of the shift driving module in fig. 8 or fig. 9, and in this embodiment, the circuit connection structure of the shift driving module 20 may be a circuit including 11T2C (which refers to a circuit including 11 transistors and 2 capacitors).

In the circuit of the shift driving module provided in this embodiment, the first control potential terminal FW and the second control potential terminal BW mainly control the forward scan and the reverse scan, where the forward scan is turned on one by one from G1 to Gn, and the reverse scan is turned on one by one from Gn to G1. In the forward scanning, the first control potential terminal FW is VGH (e.g., 15V), and the second control potential terminal BW is VGL (e.g., 10V). In the reverse scan, the first control potential terminal FW is VGL (for example, -10V), and the second control potential terminal BW is VGH (for example, 15V). The principle explanation of the present embodiment is based on forward scanning. In the display phase, the Reset potential terminal Reset and the off potential terminal Goff are understood as Reset ═ Goff, the off potential terminal Goff is only used at the touch near end, the off potential terminal Goff is set high, all the output terminals Gout ═ VGL, all the gate lines are closed, and the display screen is not updated. The interference of the touch signal to the display is avoided, if the output end Gout is not set low and is in a suspended state, the display is possibly influenced by the influence of the touch signal, capacitance coupling and high grid line voltage. The principle of the present embodiment is explained by showing the phase Reset ═ Goff. In the forward direction, the transistor T0 is used for charging the charging node P, the transistor T1 is used for discharging the charging node P, and in the reverse direction, the transistor T0 is used for discharging the charging node P, and the transistor T1 is used for charging the charging node P; the transistor T2 is used for pulling the charge node P low continuously during the high stage of the first clock signal CKB when the charge node P is not charged; after the charging node P is charged, the transistor T2 is turned off because the node Q is clamped at the low potential signal VGL by the transistor T3; the transistor T3 is turned off when the charging node P is not charged, and after the charging node P is charged, the transistor T3 is turned on, clamping the node Q at the low potential signal VGL; the transistor T4 plays a pull-up role at the rising edge of the first clock signal CKB and a pull-down role at the falling edge of the first clock signal CKB after the charging node P is charged; when the charging node P is not charged, the transistor T5 pulls down the output terminal Gout of the shift driving module 20 when the transistor T5 is at the high level of the first clock signal CKB, and after the charging node P is charged, the transistor T5 is in an off state; when the transistor T6 is at the high level of the second clock signal CK, the transistor T6 pulls down the output terminal Gout; the transistor T9 is used to pull the potential of the charging node P low before the start of a frame, and the transistor T9 is in the off state for the rest of the time; the transistor T10 is used to pull down the potential of the output terminal Gout before the start of a frame, and the transistor T10 is in the off state for the rest of the time; the capacitor C1 is used to couple the first clock signal CKB to the node Q, and the capacitor C2 is a bootstrap capacitor. In the circuit connection structure of the shift driving module 20 provided in this embodiment, signals at the start signal input terminal STV and the stop signal input terminal STVB are respectively input from the first signal input terminal STV and the third signal input terminal STVB of the selection module 10.

As shown in fig. 10, when the circuit of the shift driving module provided in this embodiment performs the scan driving operation in the normal display state:

at stage t 1: gn-1 is high, the first clock signal CKB is low, the second clock signal CK is high, the transistor T0 is turned on, the high signal of the first control potential terminal FW is transmitted to the charging node P, the charging node P is high, the transistor T3 is turned on, the low signal VGL is transmitted to the node Q via the transistor T3, the transistor T5 is turned off, the transistor T4 is turned on, the first clock signal CKB is transmitted to the output terminal Gout, and the output terminal Gout outputs low.

At stage t 2: gn-1 is a low potential, the first clock signal CKB is a high potential, the second clock signal CK is a low potential, the charging node P still maintains the high potential at the stage T1 because no low potential signal is input, the transistor T3 and the transistor T4 are turned on, the low potential signal VGL is input to the node Q under the control of the transistor T3, and the node Q is a low potential; since the first clock signal CKB is at a high level, the transistor T4 is turned on, and the output terminal Gout outputs a high level; the potential of the charging node P is further pulled high due to the bootstrap effect of the capacitor C2 (the capacitor connected to the charging node P).

At stage t 3: gn +1 is high, the first clock signal CKB is low, the second clock signal CK is high, the transistor T1 is turned on, the charging node P is written to the low potential of the second control potential terminal BW, the transistor T3 and the transistor T4 are turned off, the first clock signal CKB is low, the node Q is still low through the coupling of the capacitor C1, and the transistor T5 is still turned off. The second clock signal CK is at a high level, and the output terminal Gout outputs a low level signal VGL.

After stage t 3: gn-1 and Gn +1 are both low, and the first clock signal CKB and the second clock signal CK have opposite phases. Because Gn-1 and Gn +1 are both low potentials, the potential of the charging node P before the potential is kept is low, and the output end Gout is also always low, the potential of the charging node P cannot be raised by the bootstrap capacitor and is kept low. The signal of the first clock signal CKB is coupled to the node Q. When the first clock signal CKB is at a high level and the second clock signal CK is at a low level, the node Q is at a high level (coupled to the first clock signal CKB), the transistor T5 is turned on, the low level signal VGL is output to the output terminal Gout, and the transistor T6 is in a turned-off state; when the first clock signal CKB is low and the second clock signal CK is high, the node Q is also low due to the coupling of the capacitor C1, the transistor T5 is turned off, but the transistor T6 is turned on, and the transistor T6 outputs a low voltage to the output terminal Gout. That is, after the period T3, the output terminal Gout keeps low, the charging node P keeps low, the node Q swings with the first clock signal CKB, and the transistor T5 and the transistor T6 are alternately turned on to output the low potential signal VGL to the output terminal Gout. The circuit of the shift driving module provided by the embodiment is also beneficial to reducing power consumption in a normal display stage.

Note that the clear potential terminal Reset of the present embodiment is at a low potential throughout the scanning period, and therefore the transistor T9 and the transistor T10 are always turned off. After the last row of gate lines is output, no Gn +1 is input, for the shift driving module at the last stage, Gn +1 is Reset, the Reset potential terminal Reset is set high, since each shift driving module is connected to the Reset potential terminal Reset, at this time, the transistor T9 and the transistor T10 (display period Reset is Goff) are turned on, the output terminals Gout of all the shift driving modules output low potential signals VGL, and the Reset of all the shift driving modules is completed. And after the reset is finished, the shift driving module of the first stage starts to work again. At this time, the signal Gn-1 of the shift driving module of the first stage is a start signal directly fed from the driving chip (not fed from the screen display state selecting module 10). It can be understood that, when the scanning driving circuit of the shift driving module is adopted for the display panel with the touch control function, after the last stage of scanning operation is finished and reset is completed, the initial signal is not given temporarily, the touch control signal detection is performed firstly, in the touch control signal detection process, the closing potential end Goff is always at a high potential, and after the touch control detection is finished, the initial signal is directly given by the driving chip.

It should be further noted that, this embodiment only explains a working principle of the circuit of the shift driving module in a normal display working state, when displaying a message screen, the shift driving module of a certain stage is triggered to start working, and a principle that the interior of the shift driving module 20 of the stage is charged through the charging node P to complete the scanning driving work may refer to the explanation of the above principle, which is not described herein again.

In some optional embodiments, referring to fig. 11, fig. 11 is a schematic diagram of a connection structure of another scan driving circuit according to an embodiment of the present invention, in the scan driving circuit 000 according to this embodiment, each scan driving unit 100 further includes a Reset module 30, and the Reset module 30 includes a Reset signal input terminal Reset-C and a Reset transistor T_RA first voltage signal terminal V_R(ii) a Reset transistor T_RIs electrically connected with the Reset signal input terminal Reset-C, and has a first pole connected with the first voltage signal terminal V_RAnd the second pole is electrically connected to the gate of the first transistor T01. Optionally, the Reset signal input terminals Reset-C of all the Reset modules 30 may be connected to the same Reset signal bus Reset-charge, and the first voltage signal terminals V of all the Reset modules 30_RConnectable to the same first voltage signal bus V_R-charge。

This exampleFurther explaining that in the scan driving circuit 000, each scan driving unit 100 further includes a reset module 30, wherein a reset transistor T of the reset module 30_RIs electrically connected to a Reset signal input terminal Reset-C, a Reset transistor T_RFirst pole and first voltage signal terminal V_RElectrically connected, reset transistor T_RIs electrically connected to the gate of the first transistor T01, and when the selection module 10 is Reset to zero, a high potential signal at the Reset signal input terminal Reset-C of all the Reset modules 30 can be supplied through the same Reset signal bus Reset-charge, so that the Reset transistors T are Reset_RIs conducted and transmits the first voltage signal bus V_R-the reset signal of charge is passed through the first voltage signal terminal V_RThe first voltage is transmitted to the first transistor T01 and the first capacitor C01 of the selection module 10, so that the gate of the first transistor T01 can be cleared as far as possible, and the stability of the first capacitor C01 can be ensured.

Note that the reset transistor T of the present embodiment_RThe operation principle of the present embodiment will be described by taking an N-type transistor (the transistor is turned on when a high potential is applied to the gate) as an example, and in the specific implementation, the reset transistor T_RThe transistor may also be a P-type transistor (the transistor is turned on when a low potential is applied to the gate), and the embodiment is not particularly limited, and the setting may be selected according to actual requirements in specific implementation.

In some optional embodiments, please refer to fig. 1-11 and 12 in combination, fig. 12 is a schematic plan view of a display panel according to an embodiment of the present invention, and the display panel 111 according to this embodiment includes the scan driving circuit 000 in any of the above embodiments, and further includes a plurality of scan lines G arranged along the second direction Y and extending along the first direction X, a plurality of data lines S arranged along the first direction X and extending along the second direction Y, and a plurality of sub-pixels 40 arranged in an array, where each sub-pixel 40 is correspondingly connected to the scan lines G and the data lines S (not shown in the drawings); the output terminal Gout of the shift driving module 20 of each stage of the scanning driving unit 100 is electrically connected to each scanning line G in a one-to-one correspondence manner, and each stage of the scanning driving unit 100 is configured to drive one scanning line G to work.

The display panel 111 provided in this embodiment has the beneficial effects of the scan driving circuit 000 provided in this embodiment of the present invention, and when the display panel 111 of this embodiment is used for performing local display, power consumption can be reduced, and waste of electric quantity of the display panel 111 can be avoided.

It should be noted that fig. 12 of the present embodiment only schematically illustrates a structure of the display panel 111 related to the technical solution of the embodiment of the present invention, and it can be understood that the display panel 111 of the present embodiment further includes other structures for implementing a display function, for example, optionally, each sub-pixel 40 of the display panel 000 may further include a pixel circuit, and may further include a data line driving circuit, a voltage supply unit, and the like. The specific cascade connection manner of the scan driving unit 100 can refer to the related art, and the embodiment is not described in detail herein.

In some alternative embodiments, please refer to fig. 1-12 and 13 in combination, fig. 13 is a schematic diagram of a partial enlarged structure of the scan driving circuit in fig. 12, in this embodiment, a first input terminal Gn-1 of the mth stage shift driving module is electrically connected to an output terminal Gout of the mth-1 stage shift driving module, and a second input terminal Gn +1 of the mth stage shift driving module is electrically connected to the output terminal Gout of the mth stage shift driving module, where M and n are integers, M is greater than or equal to 2 and less than or equal to M, and M is the number of scan driving units 100 in the scan driving circuit 000.

The scan driving circuit 000 provided in this embodiment is composed of a plurality of cascaded scan driving units 100, the scan driving circuit 000 includes a plurality of cascaded shift driving modules 20, the plurality of shift driving modules 20 are cascaded in such a way that a first signal input terminal Gn-1 of a first-stage shift driving module ASG1 provides a start signal STV' (which is not provided by the display state selection module 10) through an external circuit (which may be a driving chip), and a second signal input terminal Gn +1 of the first-stage shift driving module ASG1 is connected to an output terminal Gout-2 of a second-stage shift driving module; a first signal input terminal of the second stage shift driving module ASG2 is electrically connected to the output terminal Gout-1 of the first stage shift driving module ASG1, a second signal input terminal of the second stage shift driving module ASG2 is connected to the output terminal Gout-3 of the third stage shift driving module ASG3, a first signal input terminal of the third stage shift driving module ASG3 is electrically connected to the output terminal Gout-2 of the second stage shift driving module ASG2, a second signal input terminal of the third stage shift driving module ASG3 is connected to the output terminal Gout-4 of the fourth stage shift driving module ASG4, a first signal input terminal of the fourth stage shift driving module ASG4 is electrically connected to the output terminal Gout-3 of the third stage shift driving module ASG3, a second signal input terminal of the fourth stage shift driving module ASG4 is connected to the output terminal Gout-5 … … of the fifth stage shift driving module ASG5, that is, the output signal of the second stage shift driving module ASG1 provides the output signal of the second stage shift driving module ASG 361 Control signal at the first signal input of ASG2, and so on.

It should be noted that, this embodiment only exemplifies a cascade structure of a scan driving circuit, but the cascade mode is not limited to this, and other cascade modes may also be used, and it can be understood with reference to a scan driving circuit connection structure in the related art, and only needs to implement the scan driving operation of the display panel, which is not described in detail in this embodiment.

In some alternative implementations, please refer to fig. 1-13 and 14 in combination, fig. 14 is a flow chart of a driving method of the display panel in fig. 12, and the driving method of the present embodiment is used for the operation of the display panel 111 in the above embodiments;

the driving method of the display panel 111 includes a normal display mode and a message display mode (as shown in fig. 14);

in the normal display mode, each stage of the scan driving unit 100 of the scan driving circuit 000 provides a scan driving signal to the scan line G, and the data line S provides a data voltage signal to the sub-pixel 40;

in the information screen display mode, S01: each stage of the scan driving unit 100 of the scan driving circuit 000 provides a scan driving signal to the scan line G, and the data line S does not provide a data voltage signal;

if the sub-pixels 40 in the a-th row and the sub-pixels 40 in the b-th row need to be displayed by the raster display, then:

s02: when the scanning driving circuit 000 works to the a-th scanning driving unit 100, the selection module 10 of the a-th scanning driving unit 100 starts working, the data line S synchronously provides a data voltage signal, and the a-th row sub-pixels 40 to the b-th row sub-pixels 40 start displaying the picture in sequence;

s03: after the scan driving circuit 000 is operated to the b-th scan driving unit 100, the selection module 10 of the b + 1-th scan driving unit 100 stops operating, the data line S stops providing the data voltage signal synchronously, and the b + 1-th row of sub-pixels 40 starts not to display the image; wherein a and b are positive integers and b is greater than a.

The driving method of the display panel provided in this embodiment includes a normal display mode and a display mode, in the driving method of the display panel 111 in the normal display mode, each stage of the scan driving unit 100 of the scan driving circuit 000 provides a scan driving signal for the scan line G, and the data line S provides a data voltage signal for the sub-pixel 40. In the driving method of the display panel 111 in the information display mode, each stage of the scan driving units 100 of the scan driving circuit 000 provides a scan driving signal for the scan lines G, the data lines S do not provide a data voltage signal, the scan driving circuit 000 of the display panel 111 includes a plurality of cascaded scan driving units 100, each scan driving unit 100 includes a selection module 10 and a shift driving module 20, that is, each cascaded shift driving module 20 is connected to the selection module 10. If the sub-pixels 40 in the a-th row and the sub-pixels 40 in the b-th row need to be displayed in a screen-saving manner, the selection module 10 is configured to selectively activate the first-stage shift driving module 20 corresponding to the sub-pixels 40 in the a-th row to start the scanning charging operation, so as to trigger the multi-stage shift driving modules 20 corresponding to the sub-pixels 40 in the a-th row and the sub-pixels 40 in the b-th row to perform the scanning driving operation, when the display panel using the scanning driving circuit 000 needs to display a picture locally, by applying the first signal input stv and the second signal input select start signal to the selection module 10 connected to the first-stage shift driving module 20 corresponding to the sub-pixels 40 in the a-th row and the multi-stage shift driving module 20 corresponding to the sub-pixels 40 in the a-th row to start the scanning driving operation, and when the scanning driving operation needs to be terminated after the first-stage shift driving module 20 corresponding to the sub-pixels 40 in the b-th row, only a termination signal is fed to the third signal input end stvb of the selection module 10, so that the one-stage or multi-stage shift driving module 20 at any position in the display panel can be controlled to perform the scanning driving operation. The driving method of the display panel 111 provided in this embodiment can trigger only one stage of the shift driving module 20 to start the scan driving operation when the display panel needs to display a picture locally, and does not need all stages of the shift driving modules 20 to perform the scan driving operation, which is beneficial to reducing power consumption, and can control one stage or multiple stages of the shift driving module 20 at any position in the display panel to perform the scan driving operation at will, so that the selection freedom degree of local display is high, and the design is reasonable and the operation is simple.

In some optional embodiments, please refer to fig. 1 to 14 with continued reference, in this embodiment, in the display mode of the information screen, each stage of the scan driving unit 100 of the scan driving circuit 000 provides a scan driving signal to the scan line G, the data line S does not provide a data voltage signal, and the display panel 111 does not display a picture; at this time, the second signal input terminal select inputs a low potential, the second transistor T02 is in a cut-off state, and the selection module 10 does not work;

the scan driving circuit 000 operates to the a-th scan driving unit, when the output end of the a-th shift driving module starts to output signals, the second signal input end select inputs a high potential, the second transistor T02 is turned on, the output signal of the output end of the a-th shift driving module is transmitted to the first capacitor C01 of the a-th selection module, the first capacitor C01 is charged, the first transistor T01 of the a-th selection module is turned on, the first signal input end STV inputs a high potential, the high potential of the first signal input end STV is transmitted to the start signal input end STV of the a-th shift driving module, the data line S synchronously provides a data voltage signal, and the a-th row sub-pixels to the b-th row sub-pixels 40 start to display pictures in sequence;

when the output end of the a-th stage shift driving module finishes outputting signals, the high potential of a second signal input end select is synchronously pulled down;

after the scanning driving circuit 000 works to the b-th scanning driving unit, the third signal input end stvb inputs a high potential, the b + 1-th shift driving module stops working, and the information screen display mode is finished.

Optionally, the information display mode further includes a zero clearing stage, in the zero clearing stage, the second signal input terminal select inputs a high potential, the second transistor T02 is turned on, the output terminal of each stage of the shift driving module 20 is a low potential, the charge in the first capacitor C01 of each stage of the selection module 10 is cleared, and at this time, the first signal input terminal stv inputs a low potential. Optionally, the first signal input terminals stv of all the selection modules 10 are connected to a first signal bus stv-charge, the second signal input terminals select of all the selection modules 10 are connected to a second signal bus select-charge, and the third signal input terminals stvb of all the selection modules 10 are connected to a third signal bus stvb-charge.

In this embodiment, when the scan driving circuit 000 shown in fig. 1 is applied to the display panel 111 shown in fig. 12, a local display image needs to be displayed in the a-b rows, that is, in the multiple cascaded scan driving units 100, a start signal needs to be given to the selection module 10 in the a-th scan driving unit 100 to trigger the a-b-th scan driving unit 100 to perform scan driving operation, and after the scan driving operation is performed to the b-th scan driving unit 100, the scan driving operation can be terminated by giving a termination signal to the third signal input stvb of the selection module 10 of the b + 1-th scan driving unit 100, and local display in a screen state is completed, where a driving timing chart of the local display in the screen state is shown in fig. 3 and 4:

in a first frame time (a frame time refers to a time interval between two times of scanning the preset region by the gate line) in the breath screen state, all the scanning driving units 100 normally work, but the data lines do not provide signals, and the picture does not display contents; in the clear state of the first frame, the second signal bus select-charge is fed with a high voltage, and since the output terminals Gout of all the shift driving modules 20 are at a low voltage, the charges in the first capacitors C01 of all the selection modules 10 are cleared. At the same time, the first signal bus stv-charge is at a low potential. In the normal operation state of all the scan driving units 100, the second signal bus select-charge low potential is applied until the scan driving operation of the a-1 th scan driving unit 100 is finished, and the scan driving operation proceeds to the a-th scan driving unit 100. When the output terminal Gout of the a-th stage shift driver block 20 outputs a signal, the second signal bus select-charge is synchronously asserted high, so that the first capacitor C01 of the a-th stage select block 10 is charged, and the first transistor T01 of the a-th stage select block 10 is turned on. At the end of the output Gout of the a-th stage of the shift driver module 20, the second signal bus select-charge is pulled low synchronously. The scan driving unit 100 after the a-th stage continues to operate until the first frame is finished.

At the beginning of the second frame, a high voltage of the first signal bus STV-charge is applied, and since the first transistor T01 of the selection module 10 of the a-th stage is in an on state, the high voltage of the first signal bus STV-charge is transmitted to the start signal input terminal STV of the shift driving module 20 of the a-th stage through the first transistor T01, the start signal input terminal STV of the shift driving module 20 of the a-th stage becomes a high voltage, a charging node inside the shift driving module 20 of the a-th stage is charged, and thus the scan driving circuit 000 starts to operate from the shift driving module 20 of the a-th stage; meanwhile, when the output end Gout of the a-th stage shift driving module 20 is output, a high potential of a select-charge of the second signal bus is given, and when the output end Gout of the a-th stage shift driving module 20 is ended, the select-charge of the second signal bus is pulled down, and the first capacitor C01 of the a-th stage selection module 10 is charged again to prepare for the screen saver display of the next frame; when the a-b stage scanning driving unit 100 performs scanning driving work in the breath screen state, the data lines synchronously output signals to enable the display panel to display contents at the corresponding position; when the scanning driving operation is performed to the b-th stage scanning driving unit 100, a high potential of the third signal bus STVB-charge is applied, the high potential of the third signal bus STVB-charge is transmitted to the termination signal input terminals STVB of all the shift driving modules 20, after the b-th stage scanning driving unit 100 finishes the operation, the charges of the charging nodes in all the shift driving modules 20 are released, all the shift driving modules 20 are turned off, and the b + 1-th stage shift driving module stops the operation. At which point the second frame (snap display) ends.

The third frame starts as long as the second frame is repeated.

The driving method of the display panel 111 provided in this embodiment can trigger only one stage of the shift driving module 20 to start the scan driving operation when the display panel needs to display a picture locally, and does not need all stages of the shift driving modules 20 to perform the scan driving operation, which is beneficial to reducing power consumption, and can control one stage or multiple stages of the shift driving module 20 at any position in the display panel to perform the scan driving operation at will, so that the selection freedom degree of local display is high, and the design is reasonable and the operation is simple.

In some alternative embodiments, please refer to fig. 15 and 16, fig. 15 is a schematic plane structure diagram of a display device according to an embodiment of the present invention, fig. 16 is a schematic cross-sectional structure diagram of fig. 15, and a display device 1111 according to the present embodiment includes a backlight module 222 and a display panel 111 according to any of the embodiments. Alternatively, the display device 1111 of the present embodiment may be a liquid crystal display device. The embodiment of fig. 15 and 16 only uses a mobile phone as an example to describe the display device 1111, but it should be understood that the display device 1111 provided in the embodiment of the present invention may be other display devices 1111 having a display function, such as a computer, a television, a vehicle-mounted display device, and the present invention is not limited thereto. The display device 1111 provided in the embodiment of the present invention has the beneficial effects of the display panel 111 provided in the embodiment of the present invention, and specific reference may be made to the specific description of the display panel 111 in the foregoing embodiments, which is not repeated herein.

In some alternative embodiments, please refer to fig. 15, 16 and 17 in combination, fig. 17 is a schematic plan view of the backlight module shown in fig. 16, in which the backlight module 222 of the display 1111 is a direct-type backlight module in this embodiment; the backlight module 222 includes a plurality of light-emitting partitions 2221, each light-emitting partition 2220 includes a plurality of light-emitting units 2221, and optionally, each light-emitting unit 2221 includes a switch control tube 22211 and a light-emitting diode 22212, which are electrically connected, and a control end of each switch control tube 22211 is electrically connected to one driving signal line 22213.

The backlight module 222 of the display device 1111 of this embodiment is a direct-type backlight module, which uniformly configures LED dies behind the liquid crystal display panel as light sources, so that the backlight can be uniformly transmitted to the whole screen, the details of the picture are more fine and vivid, the image can be more accurately displayed, and excellent color and contrast effect can be exhibited, which has gradually become the mainstream trend of the market.

Optionally, the backlight module 222 includes a plurality of light-emitting partitions 2221, each light-emitting partition 2220 includes a plurality of light-emitting units 2221 arranged in an array, each light-emitting unit 2221 includes a switch control tube 22211 and a light-emitting diode 22212 electrically connected, and the light-emitting diode 22212 may be any one of a sub-millimeter light-emitting diode (Mini LED) or a Micro light-emitting diode (Micro LED), which is not specifically limited in this embodiment. The control end of the switch control tube 22211 in each light emitting unit 2221 of this embodiment is electrically connected to a driving signal line 22213, that is, a driving signal line 22213 is led out from each light emitting unit 2221 independently, each driving signal line 22213 needs to input a driving signal to the control end of the switch control tube 22211 individually, the brightness (i.e., gray scale) of the light emitting diode 22212 can be controlled by the length of the power-on time of the light emitting diode 22212, the switch control tube 22211 is used as a switching element to realize whether the light emitting diode 22212 is powered on or not, and the length of the power-on time of the light emitting diode 22212 can be adjusted by different driving signals input by the driving signal line 22213, that is, different gray scales of the light emitting diode 22212 of each light emitting unit 2221 are realized by inputting different driving signals through respective driving signal lines 22213, and the driving signal line 22213 can be connected to a driving chip (not shown in the figure) to realize individual control of the light emitting unit 2221, the brightness of the leds 22212 is controlled by the driving signal lines 22213, which are used to input different driving signals, without the need for backlight scan driving control.

Optionally, referring to fig. 18 to 21, fig. 18 is a schematic plane structure diagram of another display device provided in an embodiment of the present invention, fig. 19 is a schematic plane structure diagram of another display device provided in an embodiment of the present invention, fig. 20 is a schematic plane structure diagram of another display device provided in an embodiment of the present invention, fig. 21 is a schematic plane structure diagram of another display device provided in an embodiment of the present invention, in this embodiment, each different light-emitting partition 2220 may correspond to different information screen display areas, for example, one light-emitting partition 2220 corresponds to one information screen display area M (as shown in fig. 18), or one light-emitting partition 2220 corresponds to a plurality of continuous information screen display areas M (as shown in fig. 19), or a plurality of light-emitting partitions 2220 correspond to one information screen display area M (as shown in fig. 20), or a plurality of light-emitting partitions 2220 correspond to a plurality of discontinuous information screen display areas M (as shown in fig. 21), each information screen display area may correspond to a continuous multi-stage scanning driving unit 100, so that when the scanning driving circuit 000 performs local driving, the backlight module 222 cooperates with the scanning driving circuit to provide backlight lighting at a corresponding position, so as to implement a local display function of the whole display device 1111.

It should be noted that the backlight module 222 of the present embodiment includes a plurality of light-emitting partitions 2221, which are based on a plurality of rows of light-emitting units 2221, optionally, a plurality of light-emitting partitions 2221 are based on a plurality of columns of light-emitting units 2221, or the plurality of light-emitting partitions 2221 may also be distributed in an array (i.e., in a block), which is not limited in this embodiment, and only the light-emitting partitions 2221 need to be set to flexibly cooperate with the information screen display area, so as to achieve the local display effect of the entire display device 1111.

As can be seen from the above embodiments, the scanning driving circuit, the display panel, the driving method thereof, and the display device provided in the present invention at least achieve the following beneficial effects:

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. The driving method of the display panel is characterized by comprising a normal display mode and a message screen display mode;

in the normal display mode, each stage of scanning drive unit of the scanning drive circuit provides scanning drive signals for scanning lines, and the data lines provide data voltage signals for the sub-pixels;

in the information screen display mode, each stage of the scanning driving unit of the scanning driving circuit provides a scanning driving signal for the scanning line, and the data line does not provide a data voltage signal;

if the sub-pixels in the row a to the sub-pixels in the row b need to be displayed by the information screen, then:

when the scanning driving circuit works to the a-th-level scanning driving unit, the selection module of the a-th-level scanning driving unit starts to work, the data line synchronously provides data voltage signals, and the sub-pixels in the a-th row and the sub-pixels in the b-th row start to display pictures in sequence;

after the scanning driving circuit works to the b-th stage scanning driving unit, the selection module of the b + 1-th stage scanning driving unit stops working, the data line synchronously stops providing data voltage signals, and the sub-pixels on the b +1 th row start not to display the picture;

wherein a and b are positive integers and b is greater than a.

2. The driving method according to claim 1, wherein the display panel comprises a plurality of scan lines arranged along a second direction and extending along a first direction, a plurality of data lines arranged along the first direction and extending along the second direction, and a plurality of sub-pixels arranged in an array, wherein each sub-pixel is correspondingly connected with the scan lines and the data lines;

and the output end of each level of shift driving module is electrically connected with each scanning line in a one-to-one correspondence manner.

3. The driving method according to claim 2, wherein a first input terminal of the M-th stage of the shift driving module is electrically connected to an output terminal of the M-1 th stage of the shift driving module, and a second input terminal of the M-1 th stage of the shift driving module is electrically connected to an output terminal of the M-th stage of the shift driving module, wherein M is an integer, M is greater than or equal to 2 and less than or equal to M, and M is the number of the scan driving units in the scan driving circuit.

4. The driving method according to claim 1, wherein the display panel comprises a plurality of cascaded scan driving units, each of the scan driving units comprising a selection module and a shift driving module;

the selection module comprises a first transistor, a second transistor, a first capacitor, a first signal input end, a second signal input end and a third signal input end;

the shift driving module comprises a starting signal input end, a termination signal input end and an output end;

a gate of the first transistor of the selection module is electrically connected to a first end of the first capacitor, a first pole of the first transistor is electrically connected to the first signal input end, and a second pole of the first transistor is electrically connected to the start signal input end of the shift driving module;

a gate of the second transistor of the selection module is electrically connected to the second signal input terminal, a first pole of the second transistor is electrically connected to a second end of the first capacitor, and a second pole of the second transistor is electrically connected to the output terminal of the shift driving module;

the third signal input end of the selection module is electrically connected with the termination signal input end of the shift driving module.

5. The driving method according to claim 4, wherein the shift driving module further comprises at least a third transistor and a fourth transistor, a charging node;

the third transistor and the fourth transistor are electrically connected to the charge node, a gate of the third transistor is electrically connected to the start signal input terminal, and a gate of the fourth transistor is electrically connected to the termination signal input terminal.

6. The driving method according to claim 5,

a first pole of the third transistor is electrically connected to the start signal input terminal, and a second pole of the third transistor is electrically connected to the charge node;

and a first electrode of the fourth transistor is electrically connected with a low-voltage signal end, and a second electrode of the fourth transistor is electrically connected with the charging node.

7. The driving method according to claim 5,

a first electrode of the third transistor is electrically connected with a high-voltage signal end, and a second electrode of the third transistor is electrically connected with the charging node;

8. The driving method according to claim 6 or 7, wherein each of the scan driving units further comprises a reset module including a reset signal input terminal, a reset transistor, a first voltage signal terminal;

the grid electrode of the reset transistor is electrically connected with the reset signal input end, the first electrode of the reset transistor is electrically connected with the first voltage signal end, and the second electrode of the reset transistor is electrically connected with the grid electrode of the first transistor.

9. The driving method according to claim 8,

in the information screen display mode, each stage of the scanning driving unit of the scanning driving circuit provides a scanning driving signal for the scanning line, the data line does not provide a data voltage signal, and the display panel does not display a picture; at this time, a low potential is input into the second signal input end, the second transistor is in a cut-off state, and the selection module does not work;

when the scanning driving circuit works to an a-th-stage scanning driving unit, when the output end of an a-th-stage shift driving module starts to output signals, the second signal input end inputs high potential, the second transistor is conducted, the output signals of the output end of the a-th-stage shift driving module are transmitted to a first capacitor of an a-th-stage selection module to charge the first capacitor, a first transistor of the a-th-stage selection module is opened, the high potential is input by a first signal input end, the high potential of the first signal input end is transmitted to an initial signal input end of the a-th-stage shift driving module, the data line synchronously provides data voltage signals, and the sub-pixels in the a-th row and the sub-pixels in the b-th row start to display pictures in sequence;

when the output end of the a-stage shift driving module finishes outputting signals, the high potential of the second signal input end is synchronously pulled down;

after the scanning driving circuit works to the b-th stage scanning driving unit, a high potential is input to the third signal input end, the b +1 th stage displacement driving module stops working, and the information screen display mode is ended.

10. The driving method according to claim 9,

the information screen display mode further comprises a zero clearing stage, in the zero clearing stage, a high potential is input to the second signal input end, the second transistor is conducted, the output end of the shift driving module at each stage is a low potential, the charge in the first capacitor of the selection module at each stage is cleared, and at the moment, a low potential is input to the first signal input end.

11. A display device comprising a backlight module and the display panel of any one of claims 1 to 10 disposed opposite to each other.

12. The display device according to claim 11, wherein the backlight module is a direct-type backlight module; the backlight module comprises a plurality of light-emitting subareas, each light-emitting subarea comprises a plurality of light-emitting units, each light-emitting unit comprises a switch control tube and a light-emitting diode which are electrically connected, and the control end of each switch control tube is electrically connected with one driving signal wire.