CN112634834B

CN112634834B - Backlight module and driving method thereof

Info

Publication number: CN112634834B
Application number: CN202110012510.0A
Authority: CN
Inventors: 鲁丽雯; 马从华
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2021-01-06
Filing date: 2021-01-06
Publication date: 2021-12-03
Anticipated expiration: 2041-01-06
Also published as: CN112634834A

Abstract

The invention discloses a backlight module and a driving method thereof, relating to the technical field of display; the backlight module comprises a light emitting area and a peripheral area, wherein the light emitting area comprises a light emitting unit and a backlight scanning line which is electrically connected with the light emitting unit; the peripheral area comprises a first peripheral area and a second peripheral area, the peripheral area comprises a plurality of signal control units, at least part of the signal control units are electrically connected with the backlight scanning lines, and the signal control units positioned in the first peripheral area or the second peripheral area are cascaded; the backlight module also comprises a driving power supply end, the output end of the driving power supply end is electrically connected with each signal control unit, and the driving power supply end drives the light-emitting units through the backlight scanning lines; or the output end of the driving power supply end is respectively and electrically connected with each signal control unit and each backlight scanning line, and the driving power supply end directly drives the light-emitting unit through each backlight scanning line. The signal control unit is arranged by utilizing the non-display area, so that the narrow frame of the display device is facilitated; the display area can be prevented from being provided with connecting wires, so that the effective display area is favorably improved, and the good display effect is ensured.

Description

Backlight module and driving method thereof

Technical Field

The invention relates to the technical field of display, in particular to a backlight module and a driving method thereof.

Background

In the prior art, there is a side-in type backlight, that is, a conventional LED (Light Emitting Diode) backlight is an LED strip, and then brightness spreading of the LED strip is realized by using a Light guide plate to complete a backlight module structure; however, the side-in backlight can not realize the partition control, and the peripheral picture is brighter than the central picture of the screen, that is, the uniformity of the picture is not good, and the temperature of the peripheral area of the screen is higher than the temperature of the middle of the screen; and when the side-in type backlight is applied to a large-sized display device, the above problems become more obvious and the user's use effect is poor.

Disclosure of Invention

In view of the above, the present invention provides a backlight module and a driving circuit thereof, which are used to solve the problems of poor uniformity of the image of the backlight module and poor display effect.

In a first aspect, the present application provides a backlight module, including a light emitting area and a peripheral area at least partially surrounding the light emitting area;

the light emitting area comprises a plurality of light emitting units arranged in an array, the light emitting area comprises a plurality of backlight scanning lines arranged along a first direction and extending along a second direction, and any one backlight scanning line is used for electrically connecting at least one light emitting unit in the same row; the first direction and the second direction intersect;

along the second direction, the peripheral area comprises a first peripheral area and a second peripheral area which are positioned at two sides of the light emitting area, the first peripheral area and/or the second peripheral area comprises a plurality of signal control units, at least part of the signal control units are electrically connected with the backlight scanning line, and each signal control unit positioned in the first peripheral area or the second peripheral area is cascaded;

the backlight module also comprises a driving power supply end, the output end of the driving power supply end is electrically connected with each signal control unit, and the light-emitting units are driven by each signal control unit through the backlight scanning lines; or, the output end of the driving power end is respectively electrically connected with each signal control unit and each backlight scanning line, and the driving power end directly drives the light-emitting unit through each backlight scanning line.

In a second aspect, the present application provides a driving method of a backlight module, for driving the backlight module;

the driving method comprises a light-emitting stage and a light-off stage;

the driving power supply end receives a first voltage signal and transmits the first voltage signal to each signal control unit, and the light-emitting units are driven to emit light or extinguish through the backlight scanning lines;

or, the driving power end receives the first voltage signal and directly drives the light-emitting unit to emit light or extinguish through each backlight scanning line.

Compared with the prior art, the backlight module and the driving method thereof provided by the invention at least realize the following beneficial effects:

the application provides a backlight module and a driving method thereof, wherein signal control units are arranged in a peripheral area of the backlight module, the signal control units arranged in the peripheral area on the same side are cascaded, and at least part of the signal control units are electrically connected with a backlight scanning line and used for driving light-emitting units electrically connected on the backlight scanning line by line, so that the partition control of the backlight module is facilitated, and the condition of uneven temperature of a corresponding display device in use can be avoided; the driving power end of the backlight module is externally arranged and is used for flexibly controlling the voltage/current input to the backlight scanning line; the signal control unit can utilize the non-display area in the corresponding display device to be arranged, narrow frame of the display device is guaranteed, the connecting line used for transmitting signals for the backlight scanning line is avoided being arranged in the display area, effective light emitting area of the backlight module is improved, good display effect of the display device is guaranteed, and meanwhile manufacturing cost of the backlight module is reduced.

Of course, it is not necessary for any product in which the present invention is practiced to 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 view of a backlight module in the prior art;

FIG. 2 is a schematic view of a backlight module according to the prior art;

FIG. 3 is a schematic view of a backlight module according to the prior art;

fig. 4 is a schematic view of a backlight module according to an embodiment of the present disclosure;

fig. 5 is another schematic view of a backlight module according to an embodiment of the disclosure;

fig. 6 is another schematic view of a backlight module according to an embodiment of the disclosure;

FIG. 7 is a block diagram of a signal control unit shown in FIGS. 4 and 5 according to an embodiment of the present disclosure;

FIG. 8 is an enlarged view of area A of FIG. 4 according to an exemplary embodiment of the present disclosure;

FIG. 9 is an enlarged view of area B of FIG. 6 according to an exemplary embodiment of the present disclosure;

fig. 10 is a flowchart illustrating a driving method of a backlight module according to an embodiment of the present disclosure;

fig. 11 is a timing diagram illustrating a driving method of a backlight module according to an embodiment of the present disclosure.

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.

Fig. 1 is a schematic view of a backlight module in the prior art, fig. 2 is another schematic view of the backlight module in the prior art, and fig. 3 is another schematic view of the backlight module in the prior art.

Conventionally, as shown in fig. 1, the backlight module includes a plurality of backlight scanning signal lines 01(Scan lines) extending along a first direction and arranged along a second direction, and all LEDs on each Scan line 01 are connected in parallel, which may cause the peak current of a single Scan line 01 to be too large, and thus the requirement on the line width of the Scan line 01 is high; each Scan line 01 obtains a scanning signal through at least one signal connection line 02, the scanning signal is usually input from the bottom in the second direction, the arrangement of the signal connection lines 02 can occupy the effective area in the display area, and the light transmittance in the transparent display application is greatly reduced; and each Scan line 01 needs a Scan control switch 03 circuit to be controlled independently, so that the cost is high. Or, as shown in fig. 2, on the basis of fig. 1, the arrangement manner of the signal connection lines 02 is changed, specifically, the signal connection lines 02 are all drawn out from both sides of the backlight module to be wired, and are finally electrically connected with the backlight scanning signal lines 01 in each row, and due to the problem of excessive peak current of a single Scan line 01, the sum of line widths of the signal connection lines 02 on both sides of the backlight module is large, which is not favorable for narrow frame design; and each Scan line 01 needs one Scan control switch circuit 03 to be controlled independently, so that the cost is high. Or, as shown in fig. 3, when the Scan line 01 signal is input from the side of the backlight module and the Scan line 01 is pulled out and wired to the side bonding region, the side length is usually shorter due to the limitation of the dimension width-length ratio (similar to the conventional width-length ratio of 12.3 inches, 8: 3); because the peak current of a single Scan line 01 is large and reaches hundreds of mA and even A level, the number of binding pads in a binding area corresponding to the single Scan line 01 is more than dozens, and the side edge with shorter length can not meet the number requirement of the binding pads when the number of the partitions is large; it should be noted that, when the single scan line 01 in fig. 3 is electrically connected to the bonding regions on the side edges, more than several tens of bonding pads are required, and the triangular area in fig. 3 is used to illustrate that the single scan line 01 is electrically connected to more than several tens of bonding pads.

In view of the above, the present invention provides a backlight module and a driving circuit thereof, which are used to solve the problems of poor uniformity of the image and poor display effect in the backlight module.

Fig. 4 is a schematic view of a backlight module according to an embodiment of the present disclosure, fig. 5 is another schematic view of the backlight module according to the embodiment of the present disclosure, please refer to fig. 4 and fig. 5, the present disclosure provides a backlight module 100 including a light emitting region 10 and a peripheral region 20 at least partially surrounding the light emitting region 10;

the light emitting region 10 includes a plurality of light emitting units 11 arranged in an array, the light emitting region 10 includes a plurality of backlight scanning lines 12 arranged along a first direction and extending along a second direction, and any one of the backlight scanning lines 12 is used for electrically connecting at least one light emitting unit 11 in the same row; the first direction and the second direction intersect;

in the second direction, the peripheral region 20 includes a first peripheral region 201 and a second peripheral region 202 located at two sides of the light emitting region 10, the first peripheral region 201 and/or the second peripheral region 202 includes a plurality of signal control units 30, at least some of the signal control units 30 are electrically connected to the backlight scanning line 12, and each signal control unit 30 located in the first peripheral region 201 or the second peripheral region 202 is cascaded;

the backlight module 100 further includes a driving power source terminal 40, an output terminal of the driving power source terminal 40 is electrically connected to each signal control unit 30, and the light emitting unit 11 is driven by each signal control unit 30 through the backlight scanning line 12; alternatively, the output end of the driving power source terminal 40 is electrically connected to each signal control unit 30 and each backlight scanning line 12, respectively, and the driving power source terminal 40 directly drives the light emitting unit 11 through each backlight scanning line 12.

Fig. 6 is another schematic view of a backlight module according to an embodiment of the present disclosure, and referring to fig. 4 to 6, in particular, the present disclosure provides a backlight module 100, where the backlight module 100 includes a light emitting region 10 and a peripheral region 20, and the peripheral region 20 may be disposed to completely surround the light emitting region 10, or the peripheral region 20 may be disposed to at least partially surround the light emitting region 10; the embodiment provided herein is an arrangement manner in which the peripheral region 20 completely surrounds the light emitting region 10, but the present application is not limited thereto, and only provides an alternative embodiment.

As shown in fig. 4-6, the light emitting region 10 of the backlight module 100 includes a plurality of light emitting units 11 arranged in an array, and further includes a plurality of backlight scanning lines 12 arranged along a first direction and extending along a second direction, any one of the backlight scanning lines 12 can be electrically connected to a plurality of light emitting units 11 arranged in the same row, and the backlight scanning line 12 is configured to transmit a driving signal to each of the light emitting units 11 electrically connected thereto at the same time, so as to drive the light emitting units 11 electrically connected to the backlight scanning line 12 to be turned on and off. The relationship between the first direction and the second direction provided by the present application is intersection, and for example, the first direction may be perpendicular to the second direction.

The peripheral region 20 provided by the present application includes a first peripheral region 201 and a second peripheral region 202 disposed oppositely, and along the second direction, the first peripheral region 201 and the second peripheral region 202 are respectively located at two sides of the light emitting region 10; the backlight module 100 further includes a plurality of signal control units 30, the signal control units 30 may be disposed in the first peripheral region 201, the second peripheral region 202, or at least a portion of the first peripheral region 201 and the second peripheral region 202, and fig. 4-6 show schematic diagrams in which the signal control units 30 are disposed in the first peripheral region 201 and the second peripheral region 202.

In the first peripheral region 201 and the second peripheral region 202 shown in fig. 4, each signal control unit 30 is directly electrically connected to one backlight scanning line 12; that is, in the embodiment shown in fig. 4, in each of the first peripheral region 201 and the second peripheral region 202, the driving signal is transmitted to the light emitting unit 11 through each of the backlight scanning lines 12 by each of the signal control units 30. In a specific embodiment, the signal control units 30 and the backlight scanning lines 12 may be arranged in a one-to-one correspondence, or one backlight scanning line 12 may correspond to two signal control units 30.

The backlight module 100 further includes a driving power source terminal 40, as shown in fig. 4, in the first peripheral region 201 and the second peripheral region 202, an output terminal of each driving power source terminal 40 is electrically connected to each signal control unit 30 for transmitting a driving signal to each signal control unit 30, so as to drive the corresponding light emitting unit 11 to be turned on and off through each signal control unit 30 and the backlight scanning line 12 electrically connected to the signal control unit 30.

In the first peripheral region 201 shown in fig. 5, each signal control unit 30 is directly electrically connected to one backlight scanning line 12, and in the second peripheral region 202, another circuit structure is shown, in which the signal control units 30 are not electrically connected to the backlight scanning line, but the output terminals of the driving power supply terminals are respectively electrically connected to the backlight scanning line 12 and the signal control units; that is, in the first peripheral area 201 of fig. 5, each signal control unit 30 transmits a driving signal to the light emitting unit 11 through each corresponding backlight scanning line 12; in the second peripheral region 202, the backlight scanning line 12 directly receives the driving signal transmitted from the driving power source terminal.

The backlight module 100 further includes a driving power source terminal 40, specifically, as shown in the first peripheral region 20 shown in fig. 5, an output terminal of each driving power source terminal 40 is electrically connected to each signal control unit 30, and is configured to transmit a driving signal to each signal control unit 30, so as to drive the corresponding light emitting unit 11 to turn on and turn off through each signal control unit 30 and the backlight scanning line 12 electrically connected to the signal control unit 30; as shown in the second peripheral region 202 of fig. 5, the output end of each driving power source terminal 40 is electrically connected to each signal control unit 30 and each backlight scan line 12, i.e. the output end of the driving power source terminal 40 is directly electrically connected to the backlight scan line 12, the driving power source terminal 40 can directly drive the corresponding light-emitting unit 11 to turn on and turn off through each backlight scan line 12, and the signal control unit 30 can be used to control whether the signal of the driving power source terminal 40 can be transmitted to the backlight scan line 12 (specifically described in the following content).

In addition, the present application also provides an embodiment as shown in fig. 6, that is, the first peripheral region 201 and the second peripheral region 202 both adopt the circuit structure as shown in the second peripheral region 202 of fig. 5, that is, each signal control unit 30 disposed at two sides does not directly transmit the driving signal to the backlight scanning line 12, and is only used for controlling whether the signal of the driving power source terminal 40 can be transmitted to the backlight scanning line 12; the driving signals received by the backlight scanning lines 12 are all directly transmitted by the driving power source terminal 40.

It should be noted that fig. 4-6 are only some alternative embodiments provided in the present application, and the present application is not limited thereto, for example, the signal control unit 30 and the corresponding driving power source terminal 40 may be selectively disposed in only one side of the peripheral region 20, and the signal transmission to the backlight scanning line 12, and then the light emitting unit 11 is driven to be turned on and off.

The signal control units 30 in the backlight module 100 are all arranged in the peripheral region 20, and do not need to occupy the space of the light emitting region 10, which is beneficial to improving the effective light emitting area of the backlight module, thereby ensuring that the corresponding display device has good display effect; the signal control unit 30 disposed in the peripheral region 20 utilizes the non-display region space corresponding to the corresponding display device, and does not need to increase the area of the non-display region, thereby being beneficial to ensuring the narrow frame design of the corresponding display device; in the present application, each row of light emitting units (LEDs) transmits a driving signal through the corresponding signal control unit 30 and the driving power end 40, which is beneficial to simplifying the manufacturing process of the backlight module 100 and reducing the manufacturing cost; each backlight scanning line 12 can be driven line by line, which is beneficial to avoiding the problem of uneven heat dissipation when the backlight module 100 is used and also beneficial to realizing the partition control of the backlight module 100.

Fig. 7 is a schematic block diagram of the signal control units in fig. 4 and 5 according to an embodiment of the present disclosure, please refer to fig. 7 based on fig. 4-6, and optionally, any signal control unit 30 includes a charging module 50, a first reset module 60, a second reset module 70, a third reset module 80, and a signal output module 90, and further includes a first node PU, a second node PD, and a third node PT;

the output end of the charging module 50 is electrically connected to the first node PU; a first end of the first reset module 60 is electrically connected to the first node PU, and a second end is electrically connected to the second node PD; a first end of the second reset module 70 is electrically connected to the first node PU, and a second end is electrically connected to the second node PD; a first end of the third reset module 80 is electrically connected to the second node PD, and a second end is electrically connected to the third node PT; the first end of the signal output module 90 is electrically connected to the first node PU, and the second end is electrically connected to the third node PT.

Specifically, the backlight module 100 provided in the embodiment of the present application includes a plurality of signal control units 30 electrically connected to the backlight scanning line 12 correspondingly, each of the signal control units 30 includes a charging module 50, a first reset module 60, a second reset module 70, a third reset module 80, and a signal output module 90, and further includes a first node PU, a second node PD, and a third node PT; it should be noted that the first node PU, the second node PD, and the third node PT are not limited to a literal point structure, for example, as shown in fig. 7, they may also refer to a section of routing structure, and the section of routing is equipotential, which is not specifically limited in this application.

The first node PU, the second node PD, and the third node PT included in the signal control unit 30 provided in the present application are all shown by a section of equipotential routing structure, and the electrical connection relationship between modules in each signal control unit 30 is: the output end of the charging module 50 is electrically connected to the first node PU, the first end of the first resetting module 60 is also electrically connected to the first node PU, the second end of the first resetting module 60 is electrically connected to the second node PD, the first end of the second resetting module 70 is electrically connected to the first node PU, the second end of the second resetting module 70 is electrically connected to the second node PD, the first end of the third resetting module 80 is electrically connected to the second node PD, the second end of the third resetting module 80 is electrically connected to the third node PT, the first end of the signal output module 90 is electrically connected to the first node PU, and the second end of the signal output module 90 is electrically connected to the third node PT; with the above-described structure, the electrical connection between the respective modules in each signal control unit 30 is realized.

Fig. 8 is an enlarged view of an area a in fig. 4 according to an embodiment of the present disclosure, referring to fig. 7 and fig. 8, the detailed structure and electrical connection relationship of the signal control unit 30 are specifically that, optionally, the first reset module 60 includes a first transistor T1 and a second transistor T2, the second reset module 70 includes a third transistor T3 and a first capacitor C1, the signal output module 90 includes a fourth transistor T4 and a second capacitor C2, the third reset module 80 includes a fifth transistor T5 and a sixth transistor T6, and the charging module 50 includes a seventh transistor T7;

a control end of the seventh transistor T7 is electrically connected to the first signal input end STP1/STP2, a first end is electrically connected to the first voltage signal end VGH, and a second end is electrically connected to the first node PU;

the control end of the first transistor T1 is electrically connected with the second signal input end Gn +1/Gn +2, and the first end is electrically connected with the first node PU;

a control end of the second transistor T2 is electrically connected to the second node PD, and a first end is electrically connected to the first node PU;

a control end of the third transistor T3 is electrically connected to the first node PU, and a first end is electrically connected to the second node PD;

a control end of the fourth transistor T4 is electrically connected to the first node PU, a first end is electrically connected to the first clock signal line CKB, and a second end is electrically connected to the third node PT;

a control end of the fifth transistor T5 is electrically connected to the second node PD, and a first end is electrically connected to the third node PT;

a control end of the sixth transistor T6 is electrically connected to the second clock signal line CK, and a first end is electrically connected to the third node PT;

the second terminal of the first transistor T1, the second terminal of the second transistor T2, the second terminal of the third transistor T3, the second terminal of the fifth transistor T5, and the second terminal of the sixth transistor T6 are all electrically connected to the second voltage signal terminal VGL.

Specifically, the first reset module 60 in the signal control unit 30 includes two switches, namely a first transistor T1 and a second transistor T2; the second reset module 70 includes a switch and a capacitor, specifically, a third transistor T3 and a first capacitor C1; the signal output module 90 also includes a switch and a capacitor, specifically, a fourth transistor T4 and a second capacitor C2; the third reset module 80 includes two switches, specifically, a fifth transistor T5 and a sixth transistor T6; the charging module 50 includes a switch, which is a seventh transistor T7.

Wherein the backlight module 100 further comprises a first signal input terminal STP1/STP2 (wherein the first signal input terminal of the first stage signal control unit is STP1, the first signal input terminal of the second and subsequent signal control units 30 is STP2), a first voltage signal terminal VGH, a second signal input terminal Gn +1/Gn +2 (wherein the second signal output terminal of the first stage signal control unit is Gn +1, the second signal output terminal of the second stage signal control unit is Gn +2, the second signal output terminal of the third stage signal control unit is Gn +3, and so on), a first clock signal line CKB, a second clock signal line CK, a second voltage signal terminal VGL, and so on, specifically, the control terminal of the seventh transistor T7 is electrically connected to the first signal input terminal 1/STP2, the first terminal of the seventh transistor T7 is electrically connected to the first voltage signal terminal VGH, the second terminal is electrically connected to the first node PU, that is, the seventh transistor T7 is controlled to be turned on and off by a signal transmitted through the first signal input terminal STP1/STP2, and when the seventh transistor T7 is in an on state, the second terminal is configured to transmit a driving signal of the first voltage signal terminal VGH to the first node PU. The control terminal of the first transistor T1 is electrically connected to the second signal input terminal Gn +1/Gn +2, the first terminal is electrically connected to the first node PU, and the second terminal is electrically connected to the second voltage signal terminal VGL, i.e., the signal transmitted by the second signal input terminal Gn +1/Gn +2 controls the on and off of the first transistor T1, and when the first transistor T1 is in an on state, the driving signal transmitted by the second voltage signal terminal VGL can be further transmitted to the first node PU. The control terminal of the second transistor T2 is electrically connected to the second node PD, the first terminal of the second transistor T2 is electrically connected to the first node PU, and the second terminal is electrically connected to the second voltage signal terminal VGL, that is, when the second node PD is coupled to a certain voltage level, the second node PD is used to control the second transistor T2 to be turned on and off, and when the second transistor T2 is turned on, the driving signal transmitted by the second voltage signal terminal VGL can be further transmitted to the first node PU. The control end of the third transistor T3 is electrically connected to the first node PU, the first end of the third transistor T3 is electrically connected to the second node PD, and the second end of the third transistor T3 is electrically connected to the second voltage signal end VGL, that is, when the first node PU is coupled to a certain voltage level, the third transistor T3 is controlled to be turned on and off, and when the third transistor T3 is turned on, the driving signal transmitted by the second voltage signal end VGL can be further transmitted to the second node PD. The control terminal of the fourth transistor T4 is electrically connected to the first node PU, the first terminal of the fourth transistor T4 is electrically connected to the first clock signal line CKB, and the second terminal of the fourth transistor T4 is electrically connected to the third node PT, i.e., when the first node PU is coupled to a certain potential, the fourth transistor T4 is controlled to be turned on or off, and when the fourth transistor T4 is turned on, the fourth transistor T3578 can be used to transmit the driving signal transmitted by the first clock signal line CKB to the third node PT. The control terminal of the fifth transistor T5 is electrically connected to the second node PD, the first terminal of the fifth transistor T5 is electrically connected to the third node PT, and the second terminal of the fifth transistor T5 is electrically connected to the second voltage signal terminal VGL, that is, when the second node PD is coupled to a certain voltage level, the fifth transistor T5 is controlled to be turned on and off, and when the fifth transistor T5 is turned on, the driving signal transmitted by the second voltage signal terminal VGL can be further transmitted to the third node PT. The control terminal of the sixth transistor T6 is electrically connected to the second clock signal line CK, the first terminal of the sixth transistor T6 is electrically connected to the third node PT, the second terminal of the sixth transistor T6 is electrically connected to the second voltage signal terminal VGL, the signal transmitted through the second clock signal line CK controls the sixth transistor T6 to be turned on and off, and when the sixth transistor T6 is turned on, the driving signal transmitted through the second voltage signal terminal VGL can be further transmitted to the third node PT.

Through the electrical connection of the structures in the signal control unit 30 and the electrical connection with the other external electrical signal lines, the transmission of various signals in the backlight module 100 to the third node PT can be realized, the transmission is used for controlling the type of the driving signal received by the third node PT, and when the signal control unit 30 is directly electrically connected with the backlight scanning line 12, the transmission of different voltage signals to the backlight scanning line 12 can be controlled, and the control of the light emitting state of the light emitting unit 11 is realized; or the control of the voltage signal transmitted by the signal control unit 30 is implemented differently from the control of the voltage signal received by the control terminal of the seventh transistor T7 in the next-stage signal control unit. In this way, the line-by-line driving of the light emitting units 11 electrically connected on the backlight scanning lines 12 is realized, and the flexible control of the voltage/current input to the backlight scanning lines 12 can be realized.

FIG. 9 is an enlarged view of area B of FIG. 6 according to an exemplary embodiment of the present disclosure, and it should be noted that FIG. 9 is also an enlarged view of a portion of the second peripheral region of FIG. 5 according to an exemplary embodiment of the present disclosure; referring to fig. 7 and 9 based on fig. 5 and 6, optionally, an eighth transistor T8 is further included, a control terminal of the eighth transistor T8 is electrically connected to the first node PU, a first terminal of the eighth transistor T8 is electrically connected to the output terminal of the driving power source terminal 40, and a second terminal of the eighth transistor T8 is electrically connected to a corresponding one of the backlight scan lines 12.

Specifically, when the backlight module 100 includes the driving power terminal 40, the output terminal of the driving power terminal 40 is electrically connected to each signal control unit 30 and each backlight scanning line 12, respectively, and the driving power terminal 40 directly drives the light emitting unit 11 through each backlight scanning line 12, the backlight module 100 further includes the eighth transistors T8, and the number of the eighth transistors T8 corresponds to the number of the signal control units 30; a control terminal of each of the eighth transistors T8 is electrically connected to the first node PU of its corresponding one of the signal control units 30, a first terminal of the eighth transistor T8 is electrically connected to the signal output terminal of the driving power source terminal 40, and a second terminal is electrically connected to its corresponding one of the backlight scan lines 12; when the first node PU is coupled to a certain potential, the eighth transistor T8 is controlled to be turned on and off, and when the eighth transistor T8 is in an on state, the driving signal transmitted by the driving power source terminal 40 is received and transmitted to the corresponding backlight scanning line 12, so that the driving power source terminal 40 directly controls the corresponding light-emitting unit 11 to be turned on and off.

That is, when the backlight module 100 includes the eighth transistor T8, the driving power terminal 40 can directly transmit the driving signal to the corresponding backlight scanning line 12 to control the state of the light emitting unit 11; the signal control unit 30 electrically connected to the eighth transistor T8 at this time can be used to control the on and off of the eighth transistor T8, so as to realize the control of whether the driving signal sent from the output terminal of the driving power source terminal 40 can be transmitted to the corresponding backlight scanning line 12. Meanwhile, the signal control unit 30 may be further configured to control the difference of the voltage signal received by the control terminal of the seventh transistor T7 in the next stage of signal control unit, so as to control the voltage signal transmitted by the signal control unit 30. In this way, the line-by-line driving of the light emitting units 11 electrically connected to the backlight scanning lines 12 can be realized, and the external arrangement of the driving power source terminal 40 can realize flexible control of the voltage/current input to the backlight scanning lines 12.

Here, the driving power terminal 40 electrically connected to the eighth transistor T8 transmits an alternating current.

Referring to fig. 4 and 8, optionally, the first clock signal line CKB in each signal control unit 30 is multiplexed to drive the power source terminal 40.

Specifically, when the backlight module 100 further includes the driving power source terminal 40, the output terminal of the driving power source terminal 40 is electrically connected to each signal control unit 30, and the light emitting unit 11 is driven by each signal control unit 30 through the backlight scanning line 12, the first clock signal line CKB can be directly multiplexed as the driving power source terminal 40, i.e. one end of the first clock transmission signal line far from the signal control unit 30 is directly electrically connected to the port of the driving signal received by the driving power source terminal 40; with such an arrangement, the driving power source terminal 40 can transmit the driving signal to the light emitting unit 11 through each signal control unit 30 and the backlight scanning line 12, and the usage amount of components in the backlight module 100 can be reduced, which is beneficial to reducing the manufacturing cost of the backlight module 100.

It should be noted that the driving power source terminal 40 multiplexed by the first clock signal line CKB transmits dc power.

Referring to fig. 8 and 9 on the basis of fig. 4-6, optionally, the first signal input terminal STP1 in the first stage signal control unit is used for receiving an initial trigger signal.

Specifically, no matter how the electrical connection relationship between the driving power source terminal 40 and the signal control unit 30 in the backlight module 100 is set, when the signal control unit 30 is disposed in the first peripheral region 201 and/or the second peripheral region 202 of the backlight module 100, the first signal input terminal STP1 in the first-pole signal control unit is used for receiving an initial trigger signal, and the initial trigger signal is used for controlling whether the line-by-line driving action for the light-emitting units 11 in the whole backlight module 100 is started or not, and is equivalent to acting as a master switch. By the arrangement, when each row of the light emitting units 11 is driven, a trigger signal line is not required to be arranged corresponding to each backlight scanning line one by one, so that the number of the wires arranged in the peripheral region 20 is reduced, the circuit arrangement complexity in the backlight module 100 is reduced, and the occupied space of the peripheral region 20 for arranging the wires and the like is reduced, thereby improving the manufacturing efficiency of the backlight module 100 and being beneficial to the arrangement of the narrow frame of the backlight module 100.

Referring to fig. 8 and 9 on the basis of fig. 4-6, optionally, the control signal output terminal Kn/Kn +1 in the previous stage signal control unit is electrically connected to the first signal input terminal STP2 in the next stage signal control unit.

Specifically, in order to enable the backlight scanning line 12 to receive driving signals transmitted line by line, in the present application, a control signal output terminal Kn/Kn +1 in a previous-stage signal control unit in the first peripheral region 201 and/or the second peripheral region 202 is provided (where, a control signal output terminal in the first-stage signal control unit is Kn, a control signal output terminal in the second-stage signal control unit is Kn +1, a control signal output terminal in the third-stage signal control unit is Kn +3, and so on), and both are electrically connected to a first signal input terminal STP2 in a next-stage signal control unit; that is, of the plurality of signal control units 30 disposed in the first peripheral region 201 and/or the second peripheral region 202, only the first signal input terminal STP1 of the first-stage signal control unit is used for receiving the initial trigger signal, and the first signal input terminals STP2 of the remaining second-stage to nth-stage signal control units all receive the voltage signal transmitted by the control signal output terminal Kn/Kn +1 of the corresponding previous-stage signal control unit.

Referring to fig. 8 and 9, it should be noted that the first terminal of the control signal output terminal Kn/Kn +1 is electrically connected to the third node PT for receiving the driving voltage transmitted by the first clock signal line CKB through the fourth transistor T4 or for receiving the driving voltage transmitted by the second voltage signal terminal VGL. In fig. 8, the second terminal of the control signal output terminal Kn/Kn +1 is electrically connected to the backlight scanning line 12 and the first signal input terminal STP1/STP2 in the next-stage signal control unit, respectively, and the driving voltage received by the third node PT is used for transmitting to the backlight scanning line 12 and the first signal input terminal STP2 in the next-stage signal control unit; in fig. 9, the second terminal of the control signal output terminal Kn/Kn +1 is electrically connected to only the first signal input terminal STP2 in the next-stage signal control unit, and the third node PT transmits the driving voltage received by the third node PT to the first signal input terminal STP2 in the next-stage signal control unit.

Referring to fig. 8 and 9 based on fig. 4 to 6, optionally, the fourth transistor T4 and the eighth transistor T8 are both field effect transistors.

Specifically, referring to fig. 4 and 8, when the output terminal of the driving power terminal 40 is electrically connected to each signal control unit 30, and the light emitting unit 11 is driven by each signal control unit 30 through the backlight scanning line 12, the driving signal inputted to the backlight scanning line 12 from the driving power terminal 40 needs to pass through the fourth transistor T4; referring to fig. 5, 6 and 9, when the output terminal of the driving power source terminal 40 is electrically connected to each signal control unit 30 and each backlight scan line 12, respectively, and the driving power source terminal 40 directly drives the light emitting unit 11 through each backlight scan line 12, the driving signal inputted to the backlight scan line 12 from the driving power source terminal 40 needs to pass through the eighth transistor T8.

In the backlight module 100, the light emitting unit 11 needs to receive a large current signal, so that it is necessary to ensure that the driving signal input to the backlight scanning line 12 has a large peak current; therefore, the fourth transistor T4 and the eighth transistor T8 need to have a function of transmitting a large current signal. As is known in the art, the transistors used conventionally cannot allow a large current to pass through, and therefore, the present application provides an alternative embodiment in which the fourth transistor T4 and the eighth transistor T8 are both field effect transistors (MOS transistors). It should be noted that, the fourth transistor T4 and the eighth transistor T8 are not limited to MOS transistors, and other discrete devices may be used instead, as long as large current transmission is achieved.

The MOS transistor has the advantages of low power consumption, stable performance, strong radiation resistance, and capability of allowing a large current to pass through, and can realize transmission of the driving signal received by the driving power supply terminal 40 to the backlight scanning line 12; the MOS transistor has the characteristics of small size, light weight, long service life, strong anti-interference capability, and the like, and is favorable for realizing the design of narrowing the frame and thinning the backlight module 100 and improving the service life of the backlight module 100.

Referring to fig. 4-6, the first peripheral region 201 and the second peripheral region 202 both include the signal control unit 30;

both ends of at least one backlight scanning line 12 are electrically connected to a signal control unit 30, respectively.

Specifically, the present application provides a manner of arranging the signal control units 30, in which a plurality of signal control units 30 are arranged in the first peripheral region 201 and the second peripheral region 202, and at this time, as shown in fig. 4, both ends of each backlight scanning line 12 may be respectively electrically connected to one signal control unit 30, that is, one backlight scanning line 12 may simultaneously receive the driving signals transmitted by two signal control units 30, so as to enhance the driving signals received by the backlight scanning lines 12; or when the signal control unit 30 electrically connected to the first end/the second end of the backlight scanning line 12 is damaged and cannot transmit the driving signal to the backlight scanning line 12 and/or the next-stage signal control unit, the signal control unit 30 electrically connected to the second end/the first end can still transmit the driving signal to the backlight scanning line 12 and/or the next-stage signal control unit, so as to avoid the problem of the electric signal transmission blockage in the backlight module 100, and facilitate to improve the service life of the backlight module 100. In addition, the signal control unit 30 is electrically connected to both ends of the backlight scanning line 12, which has the advantage of electromagnetic isolation and can also increase the transmission speed of the current/voltage signal.

It should be noted that, as shown in fig. 4 or fig. 6, the circuit structures in the first peripheral region 201 and the second peripheral region 202 are completely the same, which is only an exemplary embodiment and is not intended to limit the present application; specifically, the specific circuit structures of the backlight modules disposed in the first peripheral region 201 and the second peripheral region 202 shown in fig. 5 may be different, and each of the backlight scan lines 12 shown in fig. 4 to 6 can realize the function of simultaneously transmitting the driving signals at two ends.

In addition to electrically connecting the signal control units 30 at both ends of the backlight scanning line 12, the signal control units 30 may be disposed only in the first peripheral region 201, or the signal control units 30 may be disposed only in the second peripheral region 202; compared with the backlight scanning line 12, the two ends of which are electrically connected with the signal control units 30, the number of the signal control units 30 required to be arranged in the backlight module 100 can be reduced, so that the manufacturing complexity of the backlight module 100 can be reduced, and the manufacturing efficiency of the backlight module 100 can be improved.

In addition, the present application further provides a setting manner of the signal control unit 30, when the signal control units 30 are disposed in the first peripheral region 201 and the second peripheral region 202, the signal control units 30 electrically connected to the backlight scanning lines 12 in the odd-numbered rows are disposed in the first peripheral region 201, and the signal control units 30 electrically connected to the backlight scanning lines 12 in the even-numbered rows are disposed in the second peripheral region 202; alternatively, the signal control units 30 electrically connected to the backlight scan lines 12 in the odd-numbered rows are all located in the second peripheral region 202, and the signal control units 30 electrically connected to the backlight scan lines 12 in the even-numbered rows are all located in the first peripheral region 201. That is, each backlight scanning line 12 is electrically connected to only one signal control unit 30, and at this time, the signal control units 30 electrically connected to the odd-numbered rows of backlight scanning lines 12 are all located in the same peripheral area 20, and the signal control units 30 electrically connected to the even-numbered rows of backlight scanning lines 12 are all located in the other peripheral area 20. With this arrangement, the arrangement density of the signal control units 30 can be reduced on the basis of ensuring that the light emitting units 11 are driven line by line.

Fig. 10 is a flowchart illustrating a driving method of a backlight module according to an embodiment of the present application, please refer to fig. 10 on the basis of fig. 4 to 9, and based on the same inventive concept, the present application further provides a driving method of a backlight module 100 for driving the backlight module 100;

the driving method comprises a light-emitting phase 102 and a light-off phase 103;

the driving power source terminal 40 receives the first voltage signal and transmits the first voltage signal to each signal control unit 30, and drives the light emitting unit 11 to emit light or extinguish through the backlight scanning line 12;

alternatively, the driving power terminal 40 receives the first voltage signal and directly drives the light emitting unit 11 to emit or extinguish through each of the backlight scanning lines 12.

Specifically, the present application further provides a driving method of the backlight module 100, where the driving method includes a light-emitting stage 102 and a light-off stage 103, that is, the driving light-emitting unit 11 emits light 102 and the driving light-emitting unit 11 turns off 103.

When the output end of the driving power source terminal 40 is electrically connected to each signal control unit 30, and the light emitting unit 11 is driven by each signal control unit 30 through the backlight scanning line 12, the driving power source terminal 40 receives a first voltage signal, and transmits the first voltage signal to each signal control unit 30, and specifically transmits the first voltage signal to the corresponding backlight scanning line 12 through the fourth transistor T4, where the first voltage signal is used to drive the light emitting unit 11 to emit light or extinguish.

When the output end of the driving power source terminal 40 is electrically connected to each signal control unit 30 and each backlight scan line 12, respectively, and the driving power source terminal 40 directly drives the light emitting unit 11 through each backlight scan line 12, the driving power source terminal 40 receives a first voltage signal, and directly transmits the first voltage signal to the corresponding backlight scan line 12 through the eighth transistor T8, where the first voltage signal is used to drive the light emitting unit 11 to emit light or to turn off light.

That is, each row of backlight scanning lines 12 is provided with a corresponding driving power source terminal 40 to transmit a first voltage signal, so as to realize the light-emitting driving or the light-out driving of the light-emitting unit 11; whether the first voltage signal can be transmitted to the scanning signal line is controlled through each signal control unit 30, the space of a light emitting area is not occupied, the effective light emitting area of the backlight module can be increased, and the good display effect of the display device corresponding to the backlight module is guaranteed; and the signal control units 30 are all arranged in the non-display area of the corresponding display device, so that the area of the non-display area is not required to be increased, and the narrow-frame design of the display device is favorably ensured.

Fig. 11 is a timing diagram corresponding to a driving method of a backlight module according to an embodiment of the present application, please refer to fig. 10 and fig. 11 based on fig. 4 and fig. 8, and optionally, the driving method further includes a residual charge releasing phase 101, a first voltage stabilizing phase 104 and a second voltage stabilizing phase 105;

any signal control unit 30 includes a charging module 50, a first reset module 60, a second reset module 70, a third reset module 80, and a signal output module 90, and further includes a first node PU, a second node PD, and a third node PT; the first reset module 60 includes a first transistor T1, a second transistor T2, the second reset module 70 includes a third transistor T3, a first capacitor C1, the signal output module 90 includes a fourth transistor T4, a second capacitor C2, the third reset module 80 includes a fifth transistor T5, a sixth transistor T6, and the charging module 50 includes a seventh transistor T7;

a control end of the seventh transistor T7 is electrically connected to the first signal input end STP1/STP 2; the control end of the first transistor T1 is electrically connected with the second signal input end Gn +1/Gn + 2; a first end of the fourth transistor T4 is electrically connected to the first clock signal line CKB; the control signal output end Kn/Kn +1 is electrically connected with a third node PT; a control terminal of the sixth transistor T6 is electrically connected to the second clock signal line CK; second ends of the first transistor T1, the second transistor T2, the third transistor T3, the fifth transistor T5 and the sixth transistor T6 are electrically connected to a second voltage signal end VGL;

the driving method comprises the following steps:

residual charge release phase 101: the first signal input terminal STP1/STP2 receives the first voltage signal, the driving signal of the first voltage signal terminal VGH is transmitted to the first node PU, the first clock signal line CKB receives the second voltage signal, and the control signal output terminal Kn/Kn +1 releases the residual charge;

a light-emitting phase 102: the first signal input terminal STP1/STP2 receives the second voltage signal, the first clock signal line CKB receives the first voltage signal, and transmits the first voltage signal to the control signal output terminal Kn/Kn +1 to drive at least a part of the light emitting units 11 to emit light; meanwhile, the first voltage signal is transmitted to a second signal input end Gn +2 in a next-stage signal control unit;

a blanking phase 103; the first clock signal line CKB receives the second voltage signal, the second signal input terminal Gn +1/Gn +2 receives the first voltage signal, the second clock signal line CK receives the first voltage signal, and the second voltage signal terminal VGL transmits the second voltage signal to the control signal output terminal Kn/Kn +1 to drive at least a part of the light emitting units 11 to be turned off; meanwhile, the second voltage signal is transmitted to a second signal input end Gn +2 in the next-stage signal control unit;

first stabilization phase 104: the second signal input terminal Gn +1/Gn +2 receives a second voltage signal, the second clock signal line CK receives the second voltage signal, the first clock signal line CKB receives a first voltage signal, and the second voltage signal terminal VGL transmits the second voltage signal to the control signal output terminal Kn/Kn + 1;

second voltage stabilization phase 105: the second signal input terminal Gn +1/Gn +2 receives the second voltage signal, the first clock signal line CKB receives the second voltage signal, the second clock signal line CK receives the first voltage signal, and the second voltage signal terminal VGL transmits the second voltage signal to the control signal output terminal Kn/Kn + 1.

Specifically, the driving method of the backlight module 100 includes a remaining charge releasing stage 101, a first voltage stabilizing stage 104 and a second voltage stabilizing stage 105 in addition to the light emitting stage 102 and the light extinguishing stage 103, and when the output terminal of the driving power source terminal 40 is electrically connected to each signal control unit 30 and the light emitting unit 11 is driven by each signal control unit 30 through the backlight scanning line 12, the specific operation process of the corresponding backlight module 100 in each stage is as follows.

In the residual charge releasing stage 101, the first signal input terminal STP1/STP2 receives a first voltage signal, for example, a high level signal, and at this time, the first voltage signal drives the seventh transistor T7 to turn on, so that the driving signal (the first voltage signal) received by the first voltage signal terminal VGH can be transmitted to the first node PU, for example, the driving signal received by the first voltage signal terminal VGH is a high level signal, and at this time, the first node PU is precharged to a high level, so that the fourth transistor T4 is turned on; the first clock signal line CKB receives a second voltage signal, for example, a low potential signal, and the second voltage signal is transmitted to the third node PT through the fourth transistor T4, so that the control signal output terminal Kn/Kn +1 electrically connected to the third node PT can achieve the discharge of the residual charge.

Meanwhile, the control terminal of the third transistor T3 electrically connected to the first node PU also receives the first voltage signal (high signal) from the first node PU, so that the third transistor T3 is also in an on state, and the first transistor T1, the second transistor T2, the fifth transistor T5 and the sixth transistor T6 are all in an off state because the corresponding control terminals do not receive the first voltage signal (high signal).

The release of the residual charge is realized by controlling the signal output end Kn/Kn +1, which is beneficial to the accuracy and stability of the voltage/current signal transmitted in the subsequent working process, thereby ensuring that the light-emitting unit 11 in the backlight module 100 can have a good light-emitting state.

In the lighting phase 102, the first signal input terminal STP1/STP2 receives the second voltage signal, for example, a low potential signal, to control the seventh transistor T7 to turn off, at this time, the fourth transistor T4 is still in an on state, the first clock signal line CKB receives the first voltage signal (a high potential signal), and the first voltage signal (a high potential signal) can be transmitted to the control signal output terminal Kn/Kn +1 through the fourth transistor T4, and further the first voltage signal (a high potential signal) is transmitted to the anode of each LED in the lighting unit 11 through the corresponding backlight scanning line 12, so as to control each LED electrically connected to turn on, and drive each lighting unit 11 electrically connected to the backlight scanning line 12 to emit light. Meanwhile, due to the cascade connection between the signal control units 30, the first voltage signal received by the control signal output terminal Kn/Kn +1 can also be transmitted to the first signal input terminal STP2 in the next-stage signal control unit.

At this time, the control terminal of the third transistor T3 electrically connected to the first node PU still receives the first voltage signal (high signal) of the first node PU, and since the second capacitor C2 stores the high signal, the third transistor T3 is still in the on state, and the first transistor T1, the second transistor T2, the fifth transistor T5 and the sixth transistor T6 are still in the off state because the corresponding control terminals do not receive the first voltage signal (high signal).

In the off period 103, the seventh transistor T7 is still in the off state, the first clock signal line CKB receives the second voltage signal (low-level signal), the second signal input terminal Gn +1/Gn +2 receives the first voltage signal (high-level signal), and drives the first transistor T1 to be in the on state, at this time, the driving signal (second voltage signal) received by the second voltage signal terminal VGL can be transmitted to the first node PU, and the voltage of the first node PU becomes the low level, and drives the fourth transistor T4 to be off; at this time, the second clock signal line CK receives the first voltage signal (high level signal) to drive the sixth transistor T6 to be in the on state, at this time, the driving signal (second voltage signal) received by the second voltage signal terminal VGL can be transmitted to the third node PT through the sixth transistor T6, and the control signal output terminal Kn/Kn +1 electrically connected to the third node PT receives the second voltage signal (low level signal), so as to drive each light emitting unit 11 electrically connected to the corresponding backlight scanning line 12 to be turned off. At the same time, the second voltage signal (low potential signal) received by the control signal output terminal Kn/Kn +1 is also transmitted to the first signal input terminal STP2 of the next-stage signal control unit.

At this time, the second transistor T2, the third transistor T3, and the fifth transistor T5 are all in an off state.

In the first voltage stabilization phase 104, the second signal input terminal Gn +1/Gn +2 receives the second voltage signal (low-level signal), drives the first transistor T1 to be in an off state, transmits the second voltage signal (low-level signal) to the second clock signal line CK, and drives the sixth transistor T6 to be in an off state; the first voltage signal (high level signal) is transmitted to the first clock signal line CKB, the high level signal is coupled to the second node PD through the first capacitor C1, so as to drive the second transistor T2 and the fifth transistor T5 to be both in an on state, the second voltage signal terminal VGL can transmit the second voltage signal (low level signal) to the first node PU through the second transistor T2, and the second voltage signal terminal VGL can transmit the second voltage signal (low level signal) to the third node PT through the fifth transistor T5, so that the control signal output terminal Kn/Kn +1 electrically connected to the third node PT is the second voltage signal (low level signal) at this time.

In the second voltage stabilization phase 105, the second signal input terminal Gn +1/Gn +2 still receives the second voltage signal (low-level signal), drives the first transistor T1 to be in a turned-off state, transmits the second voltage signal (low-level signal) to the first clock signal line CKB, couples the second node PD to a low-level state, and drives the second transistor T2 and the fifth transistor T5 to be turned-off; at this time, the first voltage signal (high level signal) is transmitted to the second clock signal line CK, the sixth transistor T6 is driven to be in an on state, and the second voltage signal terminal VGL can transmit the second voltage signal (low level signal) to the third node PT through the sixth transistor T6; thereafter, the control signal output terminal Kn/Kn +1 electrically connected to the third node PT is always in the low potential state until the next frame scanning starts.

Fig. 11 is a timing diagram corresponding to the driving method of the backlight module according to the embodiment of the present application, please refer to fig. 10 and fig. 11 based on fig. 5/6 and fig. 9, and optionally, the driving method further includes a residual charge releasing phase 101, a first voltage stabilizing phase 104 and a second voltage stabilizing phase 105;

any signal control unit 30 includes a charging module 50, a first reset module 60, a second reset module 70, a third reset module 80, and a signal output module 90, and further includes a first node PU, a second node PD, and a third node PT; the first reset module 60 includes a first transistor T1, a second transistor T2, the second reset module 70 includes a third transistor T3, a first capacitor C1, the signal output module 90 includes a fourth transistor T4, a second capacitor C2, the third reset module 80 includes a fifth transistor T5, a sixth transistor T6, and the charging module 50 includes a seventh transistor T7; the backlight module 100 further includes an eighth transistor T8;

a control end of the seventh transistor T7 is electrically connected to the first signal input end STP1/STP 2; the control end of the first transistor T1 is electrically connected with the second signal input end Gn +1/Gn + 2; a first end of the fourth transistor T4 is electrically connected to the first clock signal line CKB; the control signal output end Kn/Kn +1 is electrically connected with a third node PT; a control terminal of the sixth transistor T6 is electrically connected to the second clock signal line CK; a control end of the eighth transistor T8 is electrically connected to the first node PU, a first end is electrically connected to the output end of the driving power supply end 40, and a second end is electrically connected to a corresponding one of the backlight scanning lines 12; second ends of the first transistor T1, the second transistor T2, the third transistor T3, the fifth transistor T5 and the sixth transistor T6 are electrically connected to a second voltage signal end VGL;

the driving method comprises the following steps:

residual charge release phase 101: the first signal input terminal STP1/STP2 receives a first voltage signal, the first voltage signal is transmitted to the first node PU, the first clock signal line CKB receives a second voltage signal, and the control signal output terminal Kn/Kn +1 releases residual charge;

a light-emitting phase 102: the first signal input terminal STP1/STP2 receives the second voltage signal, the first clock signal line CKB receives the first voltage signal, and transmits the first voltage signal to the second signal input terminal Gn +2 in the next-stage signal control unit; meanwhile, the driving power terminal 40 receives the first voltage signal, and directly drives at least a portion of the light emitting cells 11 to emit light;

a blanking phase 103; the first clock signal line CKB receives a second voltage signal, the second signal input end Gn +1/Gn +2 receives a first voltage signal, the second clock signal line CKK receives the first voltage signal, and the second voltage signal end VGL transmits the second voltage signal to the control signal output end Kn/Kn +1 and transmits the second voltage signal to the second signal input end Gn +2 in the next-stage signal control unit; meanwhile, the output terminal of the driving power terminal 40 receives the second voltage signal, and directly drives at least a part of the light emitting units 11 to be turned off;

Specifically, the driving method of the backlight module 100 includes a remaining charge releasing phase 101, a first voltage stabilizing phase 104 and a second voltage stabilizing phase 105 in addition to the light emitting phase 102 and the light extinguishing phase 103, when the output end of the driving power source terminal 40 is electrically connected to each signal control unit 30 and each backlight scanning line 12, respectively, and the driving power source terminal 40 directly drives the light emitting unit 11 through each backlight scanning line 12, the specific working process of the corresponding backlight module 100 in each phase is as follows.

In the lighting phase 102, the first signal input terminal STP1/STP2 receives the second voltage signal, for example, a low potential signal, and controls the seventh transistor T7 to turn off, at this time, the first node PU is still in a high potential state, so the fourth transistor T4 is still in an on state, the first clock signal line CKB receives the first voltage signal (high potential signal), and the first voltage signal (high potential signal) can be transmitted to the control signal output terminal Kn/Kn +1 through the fourth transistor T4, and due to the cascade connection among the signal control units 30, the first voltage signal received by the control signal output terminal Kn/Kn +1 is transmitted to the first signal input terminal STP2 of the next-stage signal control unit. Since the first node PU is still in the high state at this time, the eighth transistor T8 is in the on state, and transmits the first voltage signal (high signal) to the driving power terminal 40, and the high signal is transmitted to the anode of each LED in the light emitting unit 11 through the corresponding backlight scanning line 12, so as to control each LED electrically connected to turn on, and drive each light emitting unit 11 electrically connected to the backlight scanning line 12 to emit light.

In the off period 103, the seventh transistor T7 is still in the off state, the first clock signal line CKB receives the second voltage signal (low-level signal), the second signal input terminal Gn +1/Gn +2 receives the first voltage signal (high-level signal), and drives the first transistor T1 to be in the on state, at this time, the driving signal (second voltage signal) received by the second voltage signal terminal VGL can be transmitted to the first node PU, and the voltage of the first node PU becomes the low level, and drives the fourth transistor T4 to be off; at this time, the second clock signal line CK receives the first voltage signal (high level signal), drives the sixth transistor T6 to be in an on state, at this time, the driving signal (second voltage signal) received by the second voltage signal terminal VGL can be transmitted to the third node PT through the sixth transistor T6, the control signal output terminal Kn/Kn +1 electrically connected to the third node PT receives the second voltage signal (low level signal), at this time, the second voltage signal (low level signal) received by the control signal output terminal Kn/Kn +1 is transmitted to the first signal input terminal STP2 of the next-stage signal control unit. Since the first node PU is in the low potential state at this time, the eighth transistor T8 is in the off state, the driving power terminal 40 cannot transmit a signal to the corresponding backlight scanning line 12, and thus no high potential signal can be transmitted to the anode of each LED in the light emitting unit 11, and thus the light emitting units 11 are all in the off state.

The backlight device provided by the application can be used in various display devices, and the display devices can be: any product and component with a display function, such as a mobile phone, a tablet personal computer, a television, a step wiring area, a notebook computer, a vehicle-mounted display screen, a navigator and the like.

By the embodiment, the backlight module and the driving method thereof provided by the invention at least realize 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 backlight module is characterized by comprising a light emitting area and a peripheral area at least partially surrounding the light emitting area;

along the second direction, the peripheral area comprises a first peripheral area positioned on one side of the light emitting area and a second peripheral area positioned on the other side of the light emitting area, the first peripheral area and/or the second peripheral area comprise a plurality of signal control units, at least part of the signal control units are electrically connected with the backlight scanning line, and each signal control unit positioned in the first peripheral area or the second peripheral area is cascaded;

2. The backlight module as claimed in claim 1, wherein any of the signal control units comprises a charging module, a first reset module, a second reset module, a third reset module, a signal output module, a first node, a second node, and a third node;

the output end of the charging module is electrically connected with the first node; the first end of the first reset module is electrically connected with the first node, and the second end of the first reset module is electrically connected with the second node; the first end of the second reset module is electrically connected with the first node, and the second end of the second reset module is electrically connected with the second node; the first end of the third reset module is electrically connected with the second node, and the second end of the third reset module is electrically connected with the third node; and the first end of the signal output module is electrically connected with the first node, and the second end of the signal output module is electrically connected with the third node.

3. The backlight module as claimed in claim 2, wherein the first reset module comprises a first transistor and a second transistor, the second reset module comprises a third transistor and a first capacitor, the signal output module comprises a fourth transistor and a second capacitor, the third reset module comprises a fifth transistor and a sixth transistor, and the charging module comprises a seventh transistor;

the control end of the seventh transistor is electrically connected with the first signal input end, the first end of the seventh transistor is electrically connected with the first voltage signal end, and the second end of the seventh transistor is electrically connected with the first node;

the control end of the first transistor is electrically connected with the second signal input end, and the first end of the first transistor is electrically connected with the first node;

the control end of the second transistor is electrically connected with the second node, and the first end of the second transistor is electrically connected with the first node;

the control end of the third transistor is electrically connected with the first node, and the first end of the third transistor is electrically connected with the second node;

a control end of the fourth transistor is electrically connected with the first node, a first end of the fourth transistor is electrically connected with a first clock signal line, and a second end of the fourth transistor is electrically connected with the third node;

the control end of the fifth transistor is electrically connected with the second node, and the first end of the fifth transistor is electrically connected with the third node;

the control end of the sixth transistor is electrically connected with a second clock signal wire, and the first end of the sixth transistor is electrically connected with the third node;

the second end of the first transistor, the second end of the second transistor, the second end of the third transistor, the second end of the fifth transistor and the second end of the sixth transistor are all electrically connected with a second voltage signal end.

4. The backlight module according to claim 3, further comprising an eighth transistor, wherein a control terminal of the eighth transistor is electrically connected to the first node, a first terminal of the eighth transistor is electrically connected to the output terminal of the driving power source terminal, and a second terminal of the eighth transistor is electrically connected to a corresponding one of the backlight scan lines.

5. The backlight module as claimed in claim 3, wherein the first clock signal line of each of the signal control units is multiplexed as the driving power source terminal.

6. The backlight module as claimed in claim 3, wherein the first signal input terminal of the first stage of the signal control unit is configured to receive an initial trigger signal.

7. The backlight module as claimed in claim 3, wherein the control signal output terminal of the previous stage of the signal control unit is electrically connected to the first signal input terminal of the next stage of the signal control unit.

8. The backlight module as claimed in claim 4, wherein the fourth transistor and the eighth transistor are both field effect transistors.

9. The backlight module according to claim 1, wherein the first and second peripheral regions each comprise the signal control unit;

and two ends of at least one backlight scanning line are respectively and electrically connected with one signal control unit.

10. A driving method of a backlight module, for driving the backlight module according to any one of claims 1-9;

the driving method comprises a light-emitting stage and a light-off stage;

11. The method of claim 10, further comprising a residual charge discharging phase, a first voltage stabilizing phase and a second voltage stabilizing phase;

any one of the signal control units comprises a charging module, a first reset module, a second reset module, a third reset module, a signal output module, a first node, a second node and a third node; the first reset module comprises a first transistor and a second transistor, the second reset module comprises a third transistor and a first capacitor, the signal output module comprises a fourth transistor and a second capacitor, the third reset module comprises a fifth transistor and a sixth transistor, and the charging module comprises a seventh transistor;

the control end of the seventh transistor is electrically connected with the first signal input end; the control end of the first transistor is electrically connected with the second signal input end; a first end of the fourth transistor is electrically connected with a first clock signal line; the control signal output end is electrically connected with the third node; the control end of the sixth transistor is electrically connected with a second clock signal line; second ends of the first transistor, the second transistor, the third transistor, the fifth transistor and the sixth transistor are electrically connected with a second voltage signal end;

the driving method includes:

the residual charge releasing phase: the first signal input end receives a first voltage signal, a driving signal of the first voltage signal end is transmitted to the first node, the first clock signal line receives a second voltage signal, and the control signal output end releases residual charges;

the light emitting stage: the first signal input end receives a second voltage signal, the first clock signal line receives a first voltage signal, transmits the first voltage signal to the control signal output end, and drives at least part of the light-emitting units to emit light; meanwhile, the first voltage signal is transmitted to a second signal input end in a next-stage signal control unit;

the extinguishing stage; the first clock signal line receives a second voltage signal, the second signal input end receives a first voltage signal, the second clock signal line receives the first voltage signal, and the second voltage signal end transmits a second voltage signal to the control signal output end to drive at least part of the light-emitting units to be turned off; meanwhile, transmitting the second voltage signal to a second signal input end in a next-stage signal control unit;

the first voltage stabilization phase: the second signal input end receives a second voltage signal, the second clock signal line receives the second voltage signal, the first clock signal line receives the first voltage signal, and the second voltage signal end transmits the second voltage signal to the control signal output end;

the second voltage stabilization phase: the second signal input end receives a second voltage signal, the first clock signal line receives the second voltage signal, the second clock signal line receives the first voltage signal, and the second voltage signal end transmits the second voltage signal to the control signal output end.

12. The method of claim 10, further comprising a residual charge discharging phase, a first voltage stabilizing phase and a second voltage stabilizing phase;

any one of the signal control units comprises a charging module, a first reset module, a second reset module, a third reset module, a signal output module, a first node, a second node and a third node; the first reset module comprises a first transistor and a second transistor, the second reset module comprises a third transistor and a first capacitor, the signal output module comprises a fourth transistor and a second capacitor, the third reset module comprises a fifth transistor and a sixth transistor, and the charging module comprises a seventh transistor; the backlight module also comprises an eighth transistor;

the control end of the seventh transistor is electrically connected with the first signal input end; the control end of the first transistor is electrically connected with the second signal input end; a first end of the fourth transistor is electrically connected with a first clock signal line; the control signal output end is electrically connected with the third node; the control end of the sixth transistor is electrically connected with a second clock signal line; a control end of the eighth transistor is electrically connected with a first node, a first end of the eighth transistor is electrically connected with an output end of a driving power end, and a second end of the eighth transistor is electrically connected with a corresponding backlight scanning line; second ends of the first transistor, the second transistor, the third transistor, the fifth transistor and the sixth transistor are electrically connected with a second voltage signal end;

the driving method includes:

the residual charge releasing phase: the first signal input end receives a first voltage signal, the first voltage signal is transmitted to the first node, the first clock signal line receives a second voltage signal, and the control signal output end releases residual charges;

the light emitting stage: the first signal input end receives a second voltage signal, the first clock signal line receives the first voltage signal and transmits the first voltage signal to the second signal input end in the next-stage signal control unit; meanwhile, the driving power end receives a first voltage signal and directly drives at least part of the light-emitting units to emit light;

the extinguishing stage; the first clock signal line receives a second voltage signal, the second signal input end receives a first voltage signal, the second clock signal line receives the first voltage signal, the second voltage signal end transmits the second voltage signal to the control signal output end, and the second voltage signal is transmitted to the second signal input end in the next-stage signal control unit; meanwhile, the output end of the driving power supply end receives a second voltage signal and directly drives at least part of the light-emitting units to be extinguished;