Backlight module and display apparatus

Abstract

A backlight module (30) and a display apparatus (100). The backlight module (30) comprises a first light-emitting module (33) and a second light-emitting module (35) respectively located in different light-emitting regions (31a, 31b), wherein the second light-emitting module (35) is arranged on a peripheral side of the first light-emitting module (33). The first light-emitting module (33) comprises a plurality of first light strings (330), and the second light-emitting module (35) comprises a plurality of second light strings (350), wherein the arrangement density of the plurality of first light strings (330) is greater than the arrangement density of the plurality of second light strings (350), such that a first light-emitting region (31a) can perform more refined dimming, thereby improving the visual experience of a user.

Description

Backlight module and display device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 30, 2022, with application number 202211517709.X and application name “Backlight module and display device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of display technology, and in particular to a backlight module and a display device having the backlight module. Background Art

[0003] Currently, a growing number of display devices are adopting submillimeter light-emitting diode (Mini LED) backlight modules as their backlight source. Mini LED backlight modules can adopt a direct-lit design with a small pitch between Mini LED lamps. By densely arranging a large number of Mini LED lamps, they can achieve small-scale dimming. Compared to traditional backlight designs, Mini LED backlight modules offer better brightness uniformity and higher color contrast, enabling ultra-thin display designs while also being more energy-efficient.

[0004] However, because Mini LED backlight modules utilize a large number of Mini LED lamps per unit area, and these lamps are not individually controlled, adjusting the brightness of the Mini LED backlight module requires adjusting the brightness of multiple Mini LED lamps within a single area simultaneously, preventing precise dimming. Furthermore, individually controlling the Mini LED lamps to achieve precise dimming would significantly increase production processes and costs.

[0005] In view of this, how to perform fine dimming processing on the Mini LED backlight module while avoiding excessive increase in production costs is an urgent problem to be solved by those skilled in the art.

[0006] Summary of the Invention

[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide a backlight module and a display device having the backlight module, which aims to achieve fine dimming processing of the Mini LED backlight module while avoiding excessive increase in production costs.

[0008] To solve the above technical problems, the present application provides a backlight module, comprising a first light-emitting area and a second light-emitting area surrounding the first light-emitting area. The backlight module comprises at least one first light-emitting module and at least one second light-emitting module, wherein at least one second light-emitting module is disposed around the first light-emitting module, and at least one first light-emitting module is located within the first light-emitting area, and at least one second light-emitting module is located within the second light-emitting area. The first light-emitting module comprises a plurality of first light strings, and the second light-emitting module comprises a plurality of second light strings, wherein the arrangement density of the plurality of first light strings is greater than the arrangement density of the plurality of second light strings.

[0009] In summary, the backlight module disclosed in the embodiment of the present application includes at least one first light-emitting module and at least one second light-emitting module, at least one second light-emitting module is arranged on the peripheral side of the first light-emitting module, and at least one first light-emitting module is located in the first light-emitting area, and at least one second light-emitting module is located in the second light-emitting area. The first light-emitting module includes a plurality of first light strings, and the second light-emitting module includes a plurality of second light strings, and the arrangement density of the plurality of first light strings is greater than the arrangement density of the plurality of second light strings. Therefore, since the arrangement density of the plurality of first light strings arranged in the first light-emitting area is greater than the arrangement density of the plurality of second light strings arranged in the second light-emitting area, the first light-emitting area can perform more refined dimming, thereby improving the user's visual experience. Moreover, since the first light-emitting area is located in the middle area of ​​the backlight module, the increase in production process and production cost is only in the first light-emitting module, avoiding excessive increase in production process and production cost.

[0010] In an exemplary embodiment, the first light string includes a first light-emitting column, a second light-emitting column, and a first switch unit, wherein the first switch unit is electrically connected to a first end of the first light-emitting column, a first end of the second light-emitting column, and a second end of the second light-emitting column, respectively. The first switch unit selectively connects the first light-emitting column and the second light-emitting column in series or electrically connects the first end of the first light-emitting column and the first end of the second light-emitting column.

[0011] In an exemplary embodiment, the first switching unit includes a first driving transistor, a second driving transistor, and a third driving transistor. The first end of the first driving transistor and the first end of the second driving transistor are respectively electrically connected to the first end of the first light-emitting column, the second end of the first driving transistor is electrically connected to the first end of the second light-emitting column, and the second end of the second driving transistor and the second end of the third driving transistor are respectively electrically connected to the second end of the second light-emitting column. The control ends of the first driving transistor, the second driving transistor, and the third driving transistor are all connected to a control signal. The first driving transistor is turned off, the second driving transistor is turned on, and the third driving transistor is turned off to connect the first light-emitting column and the second light-emitting column in series. The first driving transistor is turned on, the second driving transistor is turned off, and the third driving transistor is turned on to electrically connect the first end of the first light-emitting column to the first end of the second light-emitting column.

[0012] In an exemplary embodiment, the backlight module further includes a control module electrically connected to the control terminal of the first drive transistor, the control terminal of the second drive transistor, and the control terminal of the third drive transistor, respectively. The control module is configured to generate a first control signal for turning off the first drive transistor and the third drive transistor, and to generate a second control signal for turning on the second drive transistor; alternatively, the control module is configured to generate a third control signal for turning on the first drive transistor and the third drive transistor, and to generate a fourth control signal for turning off the second drive transistor.

[0013] In an exemplary embodiment, the backlight module further includes a plurality of first driving modules, each of which includes a first driving unit, a plurality of first connecting terminals, and a plurality of second connecting terminals. The plurality of first connecting terminals are respectively electrically connected to the first terminals of the second light-emitting columns, and the plurality of second connecting terminals are respectively electrically connected to the first terminals of the third driving transistors and the second terminals of the first light-emitting columns. The first driving unit controls the potential of the second connecting terminals to adjust the brightness of the first and second light-emitting columns.

[0014] In an exemplary embodiment, the first light string includes a first light-emitting column, a plurality of second light-emitting columns, a first switch unit, and at least one second switch unit. The first switch unit is electrically connected to the first end of the first light-emitting column, the first end of the second light-emitting column, and the second end of the second light-emitting column, respectively. The second switch unit is electrically connected to the first end of one second light-emitting column, the first end of another second light-emitting column, and the second end of another second light-emitting column, respectively. The second end of one second light-emitting column is electrically connected to one of the first switch units or one of the second switch units. The first switch unit and the second switch unit selectively connect the first light-emitting column and the plurality of second light-emitting columns in series or electrically connect the first end of the first light-emitting column with the first ends of the plurality of second light-emitting columns.

[0015] In an exemplary embodiment, the first switching unit includes a first driving transistor, a second driving transistor, and a third driving transistor. The first terminal of the first driving transistor and the first terminal of the second driving transistor are respectively electrically connected to the first terminal of the first light-emitting column, the second terminal of the first driving transistor is electrically connected to the first terminal of the second light-emitting column, the second terminal of the second driving transistor and the second terminal of the third driving transistor are respectively electrically connected to the second terminal of the second light-emitting column, and the control terminals of the first driving transistor, the second driving transistor, and the third driving transistor are all connected to a control signal. The second switching unit includes a fourth driving transistor, a fifth driving transistor, and a sixth driving transistor. The first terminal of the fourth driving transistor and the first terminal of the fifth driving transistor are respectively electrically connected to the first terminal of one of the second light-emitting columns, the second terminal of the fourth driving transistor is electrically connected to the first terminal of another of the second light-emitting columns, the second terminal of the fifth driving transistor and the second terminal of the sixth driving transistor are respectively electrically connected to the second terminal of another of the second light-emitting columns, and the control terminals of the fourth driving transistor, the fifth driving transistor, and the sixth driving transistor are all connected to the control signal. The first driving transistor is turned off, the second driving transistor is turned on, the third driving transistor is turned off, the fourth driving transistor is turned off, the fifth driving transistor is turned on, and the sixth driving transistor is turned off, so as to connect the first light-emitting column and the plurality of second light-emitting columns in series. The first driving transistor is turned on, the second driving transistor is turned off, the third driving transistor is turned on, the fourth driving transistor is turned on, the fifth driving transistor is turned off, and the sixth driving transistor is turned on, so as to electrically connect the first end of the first light-emitting column and the first ends of the plurality of second light-emitting columns.

[0016] In an exemplary embodiment, the backlight module further includes a control module electrically connected to the control terminal of the first drive transistor, the control terminal of the second drive transistor, the control terminal of the third drive transistor, the control terminal of the fourth drive transistor, the control terminal of the fifth drive transistor, and the control terminal of the sixth drive transistor, respectively. The control module is configured to generate a first control signal for turning off the first drive transistor, the third drive transistor, the fourth drive transistor, and the sixth drive transistor, and to generate a second control signal for turning on the second drive transistor and the fifth drive transistor. Alternatively, the control module is configured to generate a third control signal for turning on the first drive transistor, the third drive transistor, the fourth drive transistor, and the sixth drive transistor, and to generate a fourth control signal for turning off the second drive transistor and the fifth drive transistor.

[0017] In an exemplary embodiment, the backlight module includes a plurality of first driving modules, each of which includes a first driving unit, a plurality of first connecting terminals, and a plurality of second connecting terminals. The first connecting terminal is electrically connected to the first terminal of one of the plurality of second light-emitting columns, and the plurality of second connecting terminals are electrically connected to the first terminal of the third driving transistor, the first terminal of the sixth driving transistor, and the second terminal of the first light-emitting column, respectively. The first driving unit controls the potential of the second connecting terminals to adjust the brightness of the first and second light-emitting columns.

[0018] Based on the same concept, the present application also provides a display device, which includes a first display area and a second display area arranged around the first display area. The display device includes a backlight module, which includes a first light-emitting area and a second light-emitting area arranged around the first light-emitting area. The backlight module includes at least one first light-emitting module and at least one second light-emitting module, at least one second light-emitting module is arranged around the first light-emitting module, and at least one first light-emitting module is located in the first light-emitting area, and at least one second light-emitting module is located in the second light-emitting area. The first light-emitting module includes a plurality of first light strings, and the second light-emitting module includes a plurality of second light strings, wherein the arrangement density of the plurality of first light strings is greater than the arrangement density of the plurality of second light strings. The first light-emitting module of the backlight module is located in the first display area, and the second light-emitting module of the backlight module is located in the second display area.

[0019] In summary, the display device disclosed in the embodiment of the present application includes a backlight module, the backlight module includes at least one first light-emitting module and at least one second light-emitting module, at least one second light-emitting module is arranged on the peripheral side of the first light-emitting module, and at least one first light-emitting module is located in the first display area, and at least one second light-emitting module is located in the second display area. The first light-emitting module includes a plurality of first light strings, and the second light-emitting module includes a plurality of second light strings, and the arrangement density of the plurality of first light strings is greater than the arrangement density of the plurality of second light strings. Therefore, since the arrangement density of the plurality of first light strings arranged in the first display area is greater than the arrangement density of the plurality of second light strings arranged in the second display area, the first display area can be more finely dimmed, thereby improving the user's visual experience. Moreover, since the first display area is located in the middle area of ​​the display device, the increase in production process and production cost is only in the first light-emitting module, avoiding excessive increase in production process and production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] FIG1 is a schematic diagram of the layer structure of a display device disclosed in the first embodiment of the present application;

[0022] FIG2 is a schematic diagram of the layer structure of a backlight module disclosed in a second embodiment of the present application;

[0023] FIG3 is a schematic cross-sectional view of the backlight module shown in FIG2 along the III-III direction;

[0024] FIG4 is a schematic diagram of a first structure of the first light string of the backlight module shown in FIG2 ;

[0025] FIG5 is a schematic diagram of a second structure of the first light string of the backlight module shown in FIG2 ;

[0026] FIG6 is a schematic structural diagram of a second light string of the backlight module shown in FIG2 ;

[0027] FIG7 is a circuit connection diagram of a backlight module disclosed in a second embodiment of the present application;

[0028] FIG8 is a schematic structural diagram of a first driving module of the backlight module shown in FIG7 ;

[0029] FIG9 is a schematic structural diagram of a second driving module of the backlight module shown in FIG7 ;

[0030] FIG. 10 is a schematic diagram showing the working principle of the logic module of the backlight module shown in FIG. 7 . DETAILED DESCRIPTION

[0031] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0032] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present application include direct and indirect connections (couplings) unless otherwise specified. The directional terms mentioned in the present application, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. A person of ordinary skill in the art will understand the specific meanings of the above terms in this application based on the specific circumstances. It should be noted that the terms "first," "second," and so on, in the specification, claims, and accompanying drawings of this application are used to distinguish between different objects, not to describe a specific order. Furthermore, the terms "include," "may include," "comprise," or "may include" as used in this application indicate the presence of the corresponding functions, operations, components, etc. disclosed, and do not limit the presence or absence of one or more additional functions, operations, components, etc. Furthermore, the terms "include" or "comprising" indicate the presence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and do not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusions. It should also be understood that "at least one" described herein means one or more, such as one, two or three, etc., and "plurality" means at least two, such as two or three, etc., unless otherwise clearly defined.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0035] Please refer to Figure 1, which is a schematic diagram of the layer structure of a display device disclosed in the first embodiment of this application. In this embodiment of the application, the display device 100 may include at least a display panel 10 and a backlight module 30. The display panel 10 is disposed on the light-emitting side of the backlight module 30 and is used to display images under the backlight provided by the backlight module 30.

[0036] In the embodiment of the present application, the display panel 10 may include at least a stacked array substrate 11 and a color substrate 12. The array substrate 11 is disposed on the backlight module 30, and the color substrate 12 is disposed on a side of the array substrate 11 facing away from the backlight module 30. The array substrate 11 is used to control electrical signals, and the color substrate 12 is used to display colors.

[0037] It is understood that the display device 100 can be used in electronic devices including but not limited to tablet computers, laptop computers, desktop computers, etc. According to the embodiments of the present application, the specific type of the display device 100 is not particularly limited. Those skilled in the art can design it accordingly based on the specific application requirements of the display device 100, and no further details will be given here.

[0038] In an exemplary embodiment, the display device 100 may further include other necessary components and parts such as a driving board, a power board, a high-voltage board, and a key control board. Those skilled in the art may make corresponding supplements based on the specific type and actual functions of the display device 100, which will not be elaborated here.

[0039] In the embodiments of the present application, please refer to Figures 2 and 3. Figure 2 is a schematic diagram of the layer structure of the backlight module disclosed in the second embodiment of the present application, and Figure 3 is a schematic cross-sectional diagram of the backlight module shown in Figure 2 along the III-III direction. The backlight module 30 includes a light-emitting area 31, which includes a first light-emitting area 31a and a second light-emitting area 31b surrounding the first light-emitting area 31a. The backlight module 30 may include at least one first light-emitting module 33 and at least one second light-emitting module 35. At least one second light-emitting module 35 is disposed around the first light-emitting module 33, with the first light-emitting module 33 located within the first light-emitting area 31a and the second light-emitting module 35 located within the second light-emitting area 31b. The first light-emitting module 33 includes a plurality of first light strings 330, and the second light-emitting module 35 includes a plurality of second light strings 350. The arrangement density of the plurality of first light strings 330 is greater than the arrangement density of the plurality of second light strings 350, that is, the spacing between any adjacent first light strings 330 is less than the spacing between any adjacent second light strings 350.

[0040] It can be understood that each of the first light strings 330 and each of the second light strings 350 corresponds to a separate control channel, which can adjust the luminous brightness of each of the first light strings 330 and each of the second light strings 350. The arrangement density of the multiple first light strings 330 is greater than the arrangement density of the multiple second light strings 350, so that the brightness adjustment of the first light-emitting module 33 is more refined, that is, the first light-emitting module 33 can achieve brightness adjustment in a smaller area, and the adjustable brightness gradient is smaller. At the same time, the first light-emitting module 33 is located in the first light-emitting area 31a and the second light-emitting module 35 is located in the second light-emitting area 31b, that is, the first light-emitting module 33 is located in the middle area of ​​the light-emitting area 31 (that is, the first light-emitting module 33 is arranged at the position corresponding to the first light-emitting area 31a), and the second light-emitting module 35 is located at the edge area of ​​the light-emitting area 31 (that is, the second light-emitting module 35 is arranged at the position corresponding to the second light-emitting area 31b). The middle area is the area with the most concentrated sight line, which can be more refined dimming, thereby improving the user's visual experience. Moreover, since the fine dimming of the light emitting area 31 of the backlight module 30 is performed only in the middle area, the increase in production process and production cost is only in the first light emitting module 33, avoiding excessive increase in production process and production cost.

[0041] It is understandable that the refined dimming means that the driving module can adjust the brightness of the light strings in a smaller unit area and the gradient of the brightness adjustment is smaller, or can adjust the brightness of more light strings in a unit area and the gradient of the brightness adjustment is smaller.

[0042] In the embodiment of the present application, referring to FIG1 , the display device 100 includes a display area 101. The display area 101 includes a first display area 101a and a second display area 101b surrounding the first display area 101a. The first light-emitting module 33 of the backlight module 30 is located within the first display area 101a, and the second light-emitting module 35 of the backlight module 30 is located within the second display area 101b. The first display area 101a is the central area of ​​the display device 100, where the visual field is most concentrated, allowing for more refined dimming, thereby improving the user's visual experience and increasing product competitiveness.

[0043] In summary, the backlight module 30 disclosed in the embodiment of the present application includes a light-emitting area 31, which includes a first light-emitting area 31a and a second light-emitting area 31b surrounding the first light-emitting area 31a. The backlight module 30 may include at least one first light-emitting module 33 and at least one second light-emitting module 35. The at least one second light-emitting module 35 is disposed around the first light-emitting module 33, with the first light-emitting module 33 located within the first light-emitting area 31a and the second light-emitting module 35 located within the second light-emitting area 31b. The first light-emitting module 33 includes a plurality of first light strings 330, and the second light-emitting module 35 includes a plurality of second light strings 350. The arrangement density of the plurality of first light strings 330 is greater than the arrangement density of the plurality of second light strings 350. Therefore, because the arrangement density of the plurality of first light strings 330 disposed in the first light-emitting area 31a is greater than the arrangement density of the plurality of second light strings 350 disposed in the second light-emitting area 31b, the first light-emitting area 31a can achieve more refined dimming, thereby improving the user's visual experience. Moreover, since the first light emitting area 31 a is located in the middle area of ​​the backlight module 30 , the increase in production process and production cost is only in the first light emitting module 33 , thus avoiding excessive increase in production process and production cost.

[0044] In the embodiment of the present application, please refer to FIG4 , which is a schematic diagram of a first structural embodiment of the first light string of the backlight module shown in FIG2 . The first light string 330 includes a first light-emitting column 331, a second light-emitting column 333, and a first switch unit 335. The first switch unit 335 is electrically connected to the first end of the first light-emitting column 331, the first end of the second light-emitting column 333, and the second end of the second light-emitting column 333, respectively. The first switch unit 335 is configured to selectively connect the first light-emitting column 331 and the second light-emitting column 333 in series or to electrically connect the first end of the first light-emitting column 331 to the first end of the second light-emitting column 333.

[0045] In an exemplary embodiment, the first end may be an anode of the first light-emitting column 331 and the second light-emitting column 333 , and the second end may be a cathode of the first light-emitting column 331 and the second light-emitting column 333 .

[0046] In an exemplary embodiment, the first switching unit 335 includes a first driving transistor 335a, a second driving transistor 335b, and a third driving transistor 335c. A first terminal of the first driving transistor 335a is electrically connected to a first terminal of the first light-emitting column 331, a second terminal of the first driving transistor 335a is electrically connected to a first terminal of the second light-emitting column 333, a first terminal of the second driving transistor 335b is electrically connected to a first terminal of the first light-emitting column 331, a second terminal of the second driving transistor 335b is electrically connected to a second terminal of the second light-emitting column 333, and a second terminal of the third driving transistor 335c is electrically connected to a second terminal of the second light-emitting column 333. Control terminals of the first driving transistor 335a, the second driving transistor 335b, and the third driving transistor 335c are all connected to control signals.

[0047] In an exemplary embodiment, the first terminal may be the source of the driving transistor, the second terminal may be the drain of the driving transistor, and the control terminal may be the gate of the driving transistor; alternatively, the first terminal may be the drain of the driving transistor, the second terminal may be the source of the driving transistor, and the control terminal may be the gate of the driving transistor. Specifically, by turning off the first driving transistor 335a, turning on the second driving transistor 335b, and turning off the third driving transistor 335c, the first light-emitting column 331 and the second light-emitting column 333 can be connected in series, that is, the second terminal of the second light-emitting column 333 is electrically connected to the first terminal of the first light-emitting column 331. By turning on the first driving transistor 335a, turning off the second driving transistor 335b, and turning on the third driving transistor 335c, the first terminal of the first light-emitting column 331 and the first terminal of the second light-emitting column 333 can be electrically connected.

[0048] It is understood that when the display device 100 does not require a refined display, connecting the first light-emitting column 331 and the second light-emitting column 333 in series can simultaneously drive the first light-emitting column 331 and the second light-emitting column 333 to emit light, which is beneficial for controlling the brightness of the first light-emitting column 331 and the second light-emitting column 333 to be consistent. When the display device 100 requires a refined display, the first end of the first light-emitting column 331 and the first end of the second light-emitting column 333 are electrically connected, and the second end of the first light-emitting column 331 and the second end of the second light-emitting column 333 are each independently assigned to a control channel. This allows for independent adjustment of the brightness of the first light-emitting column 331 and the second light-emitting column 333, resulting in a more refined display.

[0049] In the embodiment of the present application, please refer to FIG5 , which is a schematic diagram of a second structure of the first light string of the backlight module shown in FIG2 . The second structure of the first light string 330a includes a first light-emitting column 331, a plurality of second light-emitting columns 333, a first switch unit 335, and at least one second switch unit 337. The first switch unit 335 is electrically connected to the first end of the first light-emitting column 331, the first end of the second light-emitting column 333, and the second end of the second light-emitting column 333, respectively. That is, the first end of the first light-emitting column 331 can be electrically connected to the first end and the second end of the second light-emitting column 333 via the first switch unit 335. The second switch unit 337 is electrically connected to the first end of one second light-emitting column 333, the first end of another second light-emitting column 333, and the second end of another second light-emitting column 333, respectively. That is, any two second light-emitting columns 333 are electrically connected via the second switch unit 337, and the second end of one second light-emitting column 333 is electrically connected to one of the first switch units 335 or one of the second switch units 337. The first switch unit 335 and the second switch unit 337 are used to selectively connect the first light-emitting column 331 and the plurality of second light-emitting columns 333 in series, or to electrically connect the first end of the first light-emitting column 331 with the first ends of the plurality of second light-emitting columns 333. In other words, the first ends of the plurality of second light-emitting columns 333 are electrically connected via the second switch unit 337, the first end of one second light-emitting column 333 is electrically connected to the first end of another second light-emitting column 333 via the second switch unit 337, and the first end of any second light-emitting column 333 among the plurality of second light-emitting columns 333 is electrically connected to the first end of the first light-emitting column 331 via the first switch unit 335.

[0050] For ease of understanding, this application uses an example in which the number of first light-emitting columns 331 is one, the number of second light-emitting columns 333 is three, and the number of second switch units 337 is two, and the first light-emitting columns 331 and the second light-emitting columns 333 are arranged adjacent to each other. Specifically, one first switch unit 335 is electrically connected to the first end of one first light-emitting column 331 and the first end and second end of one second light-emitting column 333, one second switch unit 337 is electrically connected to the first end of one second light-emitting column 333 and the first end and second end of another second light-emitting column 333, and the second end of one second light-emitting column 333 is electrically connected to one first switch unit 335 or one second switch unit 337. The first end of one of the three second light-emitting columns 333 is electrically connected to one first switch unit 335 and one second switch unit 337, the first end of one second light-emitting column 333 is electrically connected to two second switch units 337, and the first end of one second light-emitting column 333 is electrically connected to only one second switch unit 337.

[0051] In an exemplary embodiment, the first switching unit 335 includes a first driving transistor 335a, a second driving transistor 335b, and a third driving transistor 335c. A first terminal of the first driving transistor 335a and a first terminal of the second driving transistor 335b are electrically connected to the first terminal of the first light-emitting column 331, respectively. A second terminal of the first driving transistor 335a is electrically connected to the first terminal of the second light-emitting column 333, a second terminal of the second driving transistor 335b is electrically connected to the second terminal of the second light-emitting column 333, and a second terminal of the third driving transistor 335c is electrically connected to the second terminal of the second light-emitting column 333. Control terminals of the first driving transistor 335a, the second driving transistor 335b, and the third driving transistor 335c are all connected to a control signal.

[0052] In an exemplary embodiment, the second switching unit 337 includes a fourth driving transistor 337a, a fifth driving transistor 337b, and a sixth driving transistor 337c. A first terminal of the fourth driving transistor 337a and a first terminal of the fifth driving transistor 337b are respectively electrically connected to the first terminal of one of the second light-emitting columns 333. A second terminal of the fourth driving transistor 337a is electrically connected to the first terminal of another second light-emitting column 333. A second terminal of the fifth driving transistor 337b is electrically connected to the second terminal of another second light-emitting column 333. A second terminal of the sixth driving transistor 337c is electrically connected to the second terminal of another second light-emitting column 333. Control terminals of the fourth driving transistor 337a, the fifth driving transistor 337b, and the sixth driving transistor 337c are all connected to a control signal.

[0053] Specifically, by turning off the first driving transistor 335a, turning on the second driving transistor 335b, turning off the third driving transistor 335c, turning off the fourth driving transistor 337a, turning on the fifth driving transistor 337b, and turning on the sixth driving transistor 337c, one first light-emitting column 331 and a plurality of second light-emitting columns 333 can be connected in series, that is, the first end of the first light-emitting column 331 is electrically connected to the second end of one second light-emitting column 333, and the first end of one second light-emitting column 333 is electrically connected to the second end of another second light-emitting column 333. By turning on the first driving transistor 335a, turning off the second driving transistor 335b, turning on the third driving transistor 335c, turning on the fourth driving transistor 337a, turning on the fifth driving transistor 337b, and turning on the sixth driving transistor 337c, the first end of the first light-emitting column 331 and the first ends of the plurality of second light-emitting columns 333 can be electrically connected.

[0054] It is understood that when the display device 100 does not require a refined display, connecting the first light-emitting column 331 in series with multiple second light-emitting columns 333 can simultaneously drive the first light-emitting column 331 and multiple second light-emitting columns 333 to emit light, which is beneficial for controlling the brightness of the first light-emitting column 331 and the second light-emitting columns 333 to be consistent. When the display device 100 requires a refined display, the first end of the first light-emitting column 331 and the first ends of the multiple second light-emitting columns 333 are electrically connected, and the second end of the first light-emitting column 331 and the second ends of the multiple second light-emitting columns 333 are each individually assigned to a control channel. This allows for individual adjustment of the brightness of the first light-emitting column 331 and each of the second light-emitting columns 333, resulting in a more refined display.

[0055] In an exemplary embodiment, the number of the second light-emitting columns 333 may be 1 to 10, for example, 1, 3, 5, 7, 10, or other numbers, which is not specifically limited in this application.

[0056] In an exemplary embodiment, the first driver transistor 335a, the second driver transistor 335b, the third driver transistor 335c, the fourth driver transistor 337a, the fifth driver transistor 337b, and the sixth driver transistor 337c may be N-type MOS transistors or P-type MOS transistors, and this application does not impose any specific limitation on this. In the embodiment of the present application, an example is given in which the first driver transistor 335a, the second driver transistor 335b, the third driver transistor 335c, the fourth driver transistor 337a, the fifth driver transistor 337b, and the sixth driver transistor 337c are all P-type MOS transistors.

[0057] In an embodiment of the present application, please refer to Figure 6, which is a structural schematic diagram of the second light string of the backlight module shown in Figure 2. The second light string 350 includes a plurality of third light-emitting columns 351, and the plurality of third light-emitting columns 351 are connected in series in sequence, that is, the second end of the third light-emitting column 351 is electrically connected to the first end of the adjacent third light-emitting column 351.

[0058] In an exemplary embodiment, the first end may be an anode of the third light-emitting column 351 , and the second end may be a cathode of the third light-emitting column 351 .

[0059] In an exemplary embodiment, the number of the third light-emitting columns 351 may be 2 to 10, for example, 2, 3, 4, 7, 9, 10, or other numbers, which is not specifically limited in this application.

[0060] In an embodiment of the present application, the first light-emitting column 331, the second light-emitting column 333 and the third light-emitting column 351 all include a plurality of light-emitting elements connected in series. The number of light-emitting elements in the first light-emitting column 331, the number of light-emitting elements in the second light-emitting column 333 and the number of light-emitting elements in the third light-emitting column 351 can all be 2 to 20, for example, 2, 3, 5, 10, 14, 20, or other numbers, and the present application does not impose any specific limitation on this.

[0061] In an exemplary embodiment, the light-emitting element may be a sub-millimeter light-emitting diode (Mini Light-Emitting Diode, Mini LED) or a micron light-emitting diode (Micro Light-Emitting Diode, Micro LED), which is not specifically limited in the present application.

[0062] In another embodiment of the present application, please refer to FIG. 4 and FIG. 7 . FIG. 7 is a schematic diagram of the circuit connection of the backlight module disclosed in the second embodiment of the present application. The backlight module 30 further includes a control module 36 , which is electrically connected to the control terminals of the plurality of first drive transistors 335 a, the control terminals of the plurality of second drive transistors 335 b, and the control terminals of the plurality of third drive transistors 335 c. The control module 36 generates a first control signal for controlling the first drive transistors 335 a to be turned off and the third drive transistors 335 c to be turned off, and generates a second control signal for controlling the second drive transistors 335 b to be turned on. Alternatively, the control module 36 generates a third control signal for controlling the first drive transistors 335 a to be turned on and the third drive transistors 335 c to be turned on, and generates a fourth control signal for controlling the second drive transistors 335 b to be turned off.

[0063] In another embodiment of the present application, please refer to Figures 5 and 7 together. The backlight module 30 also includes a control module 36, and the control module 36 is electrically connected to the control ends of the multiple first driving transistors 335a, the control ends of the multiple second driving transistors 335b, the control ends of the multiple third driving transistors 335c, the control ends of the multiple fourth driving transistors 337a, the control ends of the multiple fifth driving transistors 337b, and the control ends of the multiple sixth driving transistors 337c. The control module 36 generates a first control signal for controlling the first driving transistor 335a to be turned off, the third driving transistor 335c to be turned off, the fourth driving transistor 337a to be turned off, and the sixth driving transistor 337c to be turned off, and generates a second control signal for controlling the second driving transistor 335b to be turned on, and the fifth driving transistor 337b to be turned on. Alternatively, the control module 36 generates a third control signal for controlling the first driving transistor 335a to be turned on, the third driving transistor 335c to be turned on, the fourth driving transistor 337a to be turned on, and the sixth driving transistor 337c to be turned on, and generates a fourth control signal for controlling the second driving transistor 335b to be turned off, and the fifth driving transistor 337b to be turned off.

[0064] In an exemplary embodiment, the first control signal may be a low level signal, the second control signal may be a high level signal, the third control signal may be a high level signal, and the fourth control signal may be a low level signal.

[0065] In one embodiment of the present application, please refer to Figures 4, 7, and 8. Figure 8 is a schematic diagram of the structure of the first driver module of the backlight module shown in Figure 7. When there is only one first light-emitting column 331 and one second light-emitting column 333, the backlight module 30 further includes multiple first driver modules 37. Each of the first driver modules 37 includes a first driver unit 371, multiple first connection terminals 372, and multiple second connection terminals 373. The first connection terminal 372 is electrically connected to the first terminal of the second light-emitting column 333, and the multiple second connection terminals 373 are electrically connected to the first terminal of the third driver transistor 335c and the second terminal of the first light-emitting column 331, respectively. The first driver unit 371 is used to control the potential of the second connection terminal 373 to adjust the brightness of the first light-emitting column 331 and the second light-emitting column 333.

[0066] In order to better describe the present application and to facilitate the illustration, FIG7 shows only one first driving module 37 and one first light string 330 . In fact, there are multiple first driving modules 37 and multiple first light strings 330 .

[0067] Specifically, when the first light-emitting column 331 and the second light-emitting column 333 are connected in series, the first driving unit 371 controls the potential of the second connection terminal 373 electrically connected to the second end of the first light-emitting column 331 to adjust the brightness of the first light-emitting column 331 and the second light-emitting column 333. When the first end of the first light-emitting column 331 is electrically connected to the first end of the second light-emitting column 333, the first driving unit 371 controls the potential of the second connection terminal 373 electrically connected to the first end of the third driving transistor 335c and the second end of the first light-emitting column 331 to adjust the brightness of the first light-emitting column 331 and the brightness of the second light-emitting column 333.

[0068] In another embodiment of the present application, referring to Figures 5, 7, and 8, when there is one first light-emitting column 331 and multiple second light-emitting columns 333, the backlight module 30 further includes multiple first driving modules 37. Each first driving module 37 includes a first driving unit 371, multiple first connecting terminals 372, and multiple second connecting terminals 373. The first connecting terminal 372 is electrically connected to the first terminal of one of the multiple second light-emitting columns 333. The first terminal of the second light-emitting column 333 is electrically connected to only one switching unit (the first switching unit 335 or the second switching unit 337). The multiple second connecting terminals 373 are electrically connected to the first terminal of the third driving transistor 335c, the first terminal of the sixth driving transistor 337c, and the second terminal of the first light-emitting column 331, respectively. The first driving unit 371 is used to control the potential of the second connecting terminal 373 to adjust the brightness of the first and second light-emitting columns 331 and 333.

[0069] In order to better describe the present application and to facilitate the illustration, FIG7 shows only one second driving module 38 and one second light string 350 . In fact, there are multiple second driving modules 38 and multiple second light strings 350 .

[0070] Specifically, when the first light-emitting column 331 and the plurality of second light-emitting columns 333 are connected in series, the first driving unit 371 controls the potential of the second connection terminal 373 electrically connected to the second end of the first light-emitting column 331 to adjust the brightness of the first light-emitting column 331 and the plurality of second light-emitting columns 333. When the first end of the first light-emitting column 331 is simultaneously electrically connected to the first ends of the plurality of second light-emitting columns 333, the first driving unit 371 controls the potential of the second connection terminal 373 electrically connected to the first end of the third driving transistor 335c, the first end of the sixth driving transistor 337c, and the second end of the first light-emitting column 331, respectively, to adjust the brightness of the first light-emitting column 331 and the brightness of the plurality of second light-emitting columns 333.

[0071] In an exemplary embodiment, one first driving module 37 corresponds to one first light emitting module 33 , that is, one first driving module 37 is electrically connected to the plurality of first light strings 330 of one first light emitting module 33 , and the first driving unit 371 may be a driving integrated chip.

[0072] In an exemplary embodiment, the number of the first connection ends 372 and the second connection ends 373 is determined according to the number of the first light strings 330 (330a) of the first light-emitting module 33 and the number of the first light-emitting columns 331 and the second light-emitting columns 333 included in the first light string 330 (330a), and the present application does not impose any specific restrictions on this.

[0073] In the embodiment of the present application, please refer to FIG6 and FIG9 . FIG9 is a schematic diagram of the structure of the second driving module of the backlight module shown in FIG7 . The backlight module 30 further includes multiple second driving modules 38 . The second driving modules 38 include a second driving unit 381 , multiple third connecting terminals 382 , and multiple fourth connecting terminals 383 . The third connecting terminals 382 , the multiple third light-emitting columns 351 , and the fourth connecting terminals 383 are connected in series. That is, the multiple third light-emitting columns 351 are connected in series between the third connecting terminals 382 and the fourth connecting terminals 383 . The second driving unit 381 is used to control the brightness of the multiple third light-emitting columns 351 .

[0074] It is understandable that the second driving unit 381 controls the potential of the third connection terminal 382 and / or the fourth connection terminal 383 to adjust the luminous brightness of the third light-emitting column 351 , and this application does not impose any specific limitation on this.

[0075] In an exemplary embodiment, one second driving module 38 corresponds to one second light emitting module 35 , that is, one second driving module 38 is electrically connected to multiple second light strings 350 of one second light emitting module 35 , and the second driving unit 381 may be a driving integrated chip.

[0076] In an exemplary embodiment, the number of the third connection ends 382 and the fourth connection ends 383 is determined according to the number of the second light strings 350 of the second light emitting module 35 , and this application does not impose any specific limitation on this.

[0077] It can be understood that by individually controlling the luminous brightness of the first light string 330 of each first light-emitting module 33 through multiple first driving modules 37 and individually controlling the luminous brightness of the second light string 350 of each second light-emitting module 35 through multiple second driving modules 38, the first light string 330 and the second light string 350 can be turned off in individual areas according to display needs, thereby achieving complete black and realizing ultra-high contrast, making the bright field brighter and the dark field darker, thereby making the display effect more detailed.

[0078] In the embodiment of the present application, please refer to FIG. 7 and FIG. 10 . FIG. 10 is a schematic diagram of the working principle of the logic module of the backlight module shown in FIG. 7 . The backlight module 30 further includes a logic module 39. The logic module 39 is configured to receive a front-end signal and divide the front-end signal into a first front-end signal and a second front-end signal according to the light-emitting areas corresponding to the front-end signal. The first front-end signal corresponds to the first light-emitting area 31 a, and the second front-end signal corresponds to the second light-emitting area 31 b. The logic module 39 is configured to parse the first front-end signal into an adjustment signal and a first potential signal, and to parse the second front-end signal into a second potential signal, and transmit the adjustment signal to the control module 36, the first potential signal to the first driver module 37, and the second potential signal to the second driver module 38.

[0079] In an exemplary embodiment, the front-end signal may be sent by a system on chip (SOC).

[0080] In an exemplary embodiment, the control module 36 outputs the first control signal and the second control signal or the third control signal and the fourth control signal according to the adjustment signal. The first driving unit 371 adjusts the potential of the second connection terminal 373 according to the first potential signal, and the second driving unit 381 adjusts the potential of the third connection terminal 382 and / or the fourth connection terminal 383 according to the second potential signal.

[0081] It is understood that when the signal source corresponding to the first front-end signal has a low resolution or the display quality is coarse, the control module 36 outputs the first and second control signals, i.e., the first light-emitting column 331 and the second light-emitting column 333 are connected in series. When the signal source corresponding to the first front-end signal has a high resolution or the display quality is fine, the control module 36 outputs the third and fourth control signals, i.e., the first end of the first light-emitting column 331 is electrically connected to the first end of the second light-emitting column 333. The first light-emitting column 331 and the second light-emitting column 333 can independently adjust their brightness, resulting in a more refined display.

[0082] In an exemplary embodiment, the signal source resolution refers to the resolution corresponding to the signal emitted by the signal source.

[0083] In an exemplary embodiment, the backlight module 30 further includes a switch module 41 and a power supply module 42. The switch module 41 is electrically connected to the first driver module 37, the second driver module 38, and the power supply module 42, respectively. The switch module 41 is configured to electrically connect the power supply module 42 to the first driver module 37 and to electrically connect the power supply module 42 to the second driver module 38. The power supply module 42 is configured to provide electrical energy to the first driver module 37 and the second driver module 38.

[0084] In an exemplary embodiment, referring to FIG1 , the backlight module 30 further includes a backplate 45, a plastic frame 46, a cushion 47, and an optical film assembly 48. The first light-emitting module 33 and the second light-emitting module 35 are disposed within the backplate 45. The control module 36, the first driver module 37, the second driver module 38, the switch module 41, and the energy supply module 42 may be disposed on one side of the backplate 45, and the backplate 45 is stacked with the display panel 10. The plastic frame 46 is disposed on the side of the backplate 45 facing the display panel 10, and the cushion 47 is disposed on the side of the plastic frame 46 facing the display panel 10, that is, the cushion 47 is located between the plastic frame 46 and the display panel 10. The optical film assembly 48 is disposed on the light-emitting side of the first light-emitting module 33 and the second light-emitting module 35, and is located inside the plastic frame 46.

[0085] It can be understood that the optical film assembly 48 can at least include at least one prism sheet and at least one diffuser sheet arranged in a stacked manner, the prism sheet is used to increase the brightness of the light emitted by the first light-emitting module 33 and the second light-emitting module 35, and the diffuser is used to make the light emitted by the first light-emitting module 33 and the second light-emitting module 35 more uniform, thereby avoiding inconsistent brightness between the first light-emitting area 31a and the second light-emitting area 31b.

[0086] In an exemplary embodiment, the display device 100 further includes a mainboard, which is electrically connected to the logic module 39 and the power supply module 42 . The mainboard is configured to provide the front-end signal to the logic module and provide power to the power supply module 42 .

[0087] In summary, the backlight module 30 disclosed in the embodiment of the present application includes a light-emitting area 31, which includes a first light-emitting area 31a and a second light-emitting area 31b surrounding the first light-emitting area 31a. The backlight module 30 may include at least one first light-emitting module 33 and at least one second light-emitting module 35. The at least one second light-emitting module 35 is disposed around the first light-emitting module 33, with the first light-emitting module 33 located within the first light-emitting area 31a and the second light-emitting module 35 located within the second light-emitting area 31b. The first light-emitting module 33 includes a plurality of first light strings 330, and the second light-emitting module 35 includes a plurality of second light strings 350. The arrangement density of the plurality of first light strings 330 is greater than the arrangement density of the plurality of second light strings 350. Therefore, the arrangement density of the plurality of first light strings 330 disposed in the first light-emitting area 31a is greater than the arrangement density of the plurality of second light strings 350 disposed in the second light-emitting area 31b, allowing for more refined dimming in the first light-emitting area 31a, thereby improving the user's visual experience. Moreover, since the first light emitting area 31 a is located in the middle area of ​​the backlight module 30 , the increase in production process and production cost is only in the first light emitting module 33 , thus avoiding excessive increase in production process and production cost.

[0088] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0089] It should be understood that the application of this application is not limited to the above examples. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the scope of protection of the claims appended to this application. Those skilled in the art will understand that implementing all or part of the technical solutions of the above embodiments and making equivalent changes in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A backlight module, comprising a first light-emitting area and a second light-emitting area surrounding the first light-emitting area, wherein: The backlight module includes at least one first light-emitting module and at least one second light-emitting module, at least one of the second light-emitting modules is arranged on the periphery of the first light-emitting module, at least one of the first light-emitting modules is located in the first light-emitting area, and at least one of the second light-emitting modules is located in the second light-emitting area; The first light emitting module includes a plurality of first light strings, and the second light emitting module includes a plurality of second light strings, wherein an arrangement density of the plurality of first light strings is greater than an arrangement density of the plurality of second light strings.

2. The backlight module according to claim 1, wherein: The first light string includes a first light-emitting column, a second light-emitting column and a first switch unit, the first switch unit is electrically connected to the first end of the first light-emitting column, the first end of the second light-emitting column and the second end of the second light-emitting column, respectively, and the first switch unit selectively connects the first light-emitting column and the second light-emitting column in series or electrically connects the first end of the first light-emitting column and the first end of the second light-emitting column.

3. The backlight module according to claim 2, wherein: The first switch unit includes a first driving transistor, a second driving transistor and a third driving transistor, wherein the first end of the first driving transistor and the first end of the second driving transistor are electrically connected to the first end of the first light-emitting column respectively, the second end of the first driving transistor is electrically connected to the first end of the second light-emitting column, the second end of the second driving transistor and the second end of the third driving transistor are electrically connected to the second end of the second light-emitting column respectively, and the control end of the first driving transistor, the control end of the second driving transistor and the control end of the third driving transistor are all connected to a control signal; The first driving transistor is turned off, the second driving transistor is turned on, and the third driving transistor is turned off, so as to connect the first light-emitting column and the second light-emitting column in series; The first driving transistor is turned on, the second driving transistor is turned off, and the third driving transistor is turned on, so as to electrically connect the first end of the first light-emitting column with the first end of the second light-emitting column.

4. The backlight module according to claim 3, wherein: The backlight module further includes a control module, and the control module is electrically connected to the control end of the first driving transistor, the control end of the second driving transistor, and the control end of the third driving transistor respectively; The control module is used to generate a first control signal for controlling the first driving transistor to be turned off and the third driving transistor to be turned off, and to generate a second control signal for controlling the second driving transistor to be turned on; Alternatively, the control module is used to generate a third control signal for controlling the first driving transistor to be turned on and the third driving transistor to be turned on, and to generate a fourth control signal for controlling the second driving transistor to be turned off.

5. The backlight module according to claim 3, wherein: The backlight module also includes multiple first driving modules, each of which includes a first driving unit, multiple first connection ends and multiple second connection ends, the multiple first connection ends are respectively electrically connected to the first ends of the second light-emitting columns, the multiple second connection ends are respectively electrically connected to the first end of the third driving transistor and the second end of the first light-emitting column, and the first driving unit controls the potential of the second connection end to adjust the light-emitting brightness of the first light-emitting column and the second light-emitting column.

6. The backlight module according to claim 4, wherein: The backlight module also includes multiple first driving modules, each of which includes a first driving unit, multiple first connection ends and multiple second connection ends, the multiple first connection ends are respectively electrically connected to the first ends of the second light-emitting columns, the multiple second connection ends are respectively electrically connected to the first end of the third driving transistor and the second end of the first light-emitting column, and the first driving unit controls the potential of the second connection end to adjust the light-emitting brightness of the first light-emitting column and the second light-emitting column.

7. The backlight module according to claim 1, wherein: The first light string includes a first light-emitting column, a plurality of second light-emitting columns, a first switch unit, and at least one second switch unit, the first switch unit is electrically connected to a first end of the first light-emitting column, a first end of the second light-emitting column, and a second end of the second light-emitting column, respectively, the second switch unit is electrically connected to a first end of one of the second light-emitting columns, a first end of another of the second light-emitting columns, and a second end of another of the second light-emitting columns, respectively, and a second end of one of the second light-emitting columns is electrically connected to one of the first switch units or one of the second switch units; The first switch unit and the second switch unit selectively connect the first light-emitting column and a plurality of the second light-emitting columns in series or electrically connect a first end of the first light-emitting column with a plurality of first ends of the second light-emitting columns.

8. The backlight module according to claim 7, wherein: The first switch unit includes a first driving transistor, a second driving transistor and a third driving transistor, wherein the first end of the first driving transistor and the first end of the second driving transistor are electrically connected to the first end of the first light-emitting column respectively, the second end of the first driving transistor is electrically connected to the first end of the second light-emitting column, the second end of the second driving transistor and the second end of the third driving transistor are electrically connected to the second end of the second light-emitting column respectively, and the control end of the first driving transistor, the control end of the second driving transistor and the control end of the third driving transistor are all connected to a control signal; The second switch unit comprises a fourth driving transistor, a fifth driving transistor and a sixth driving transistor, wherein a first end of the fourth driving transistor and a first end of the fifth driving transistor are respectively electrically connected to a first end of one of the second light-emitting columns, a second end of the fourth driving transistor is electrically connected to a first end of another of the second light-emitting columns, a second end of the fifth driving transistor and a second end of the sixth driving transistor are respectively electrically connected to a second end of another of the second light-emitting columns, and a control end of the fourth driving transistor, a control end of the fifth driving transistor and a control end of the sixth driving transistor are all connected to the control signal; The first driving transistor is turned off, the second driving transistor is turned on, the third driving transistor is turned off, the fourth driving transistor is turned off, the fifth driving transistor is turned on, and the sixth driving transistor is turned off, so as to connect the first light-emitting column and a plurality of the second light-emitting columns in series; The first driving transistor is turned on, the second driving transistor is turned off, the third driving transistor is turned on, the fourth driving transistor is turned on, the fifth driving transistor is turned off, and the sixth driving transistor is turned on to electrically connect the first end of the first light-emitting column and the first ends of multiple second light-emitting columns.

9. The backlight module according to claim 8, wherein: The backlight module further includes a control module, which is electrically connected to the control end of the first driving transistor, the control end of the second driving transistor, the control end of the third driving transistor, the control end of the fourth driving transistor, the control end of the fifth driving transistor, and the control end of the sixth driving transistor respectively; The control module is used to generate a first control signal for controlling the first driving transistor to be turned off, the third driving transistor to be turned off, the fourth driving transistor to be turned off, and the sixth driving transistor to be turned off, and to generate a second control signal for controlling the second driving transistor to be turned on, and the fifth driving transistor to be turned on. Alternatively, the control module is used to generate a third control signal for controlling the first driving transistor to be turned on, the third driving transistor to be turned on, the fourth driving transistor to be turned on, and the sixth driving transistor to be turned on, and to generate a fourth control signal for controlling the second driving transistor to be turned off, and the fifth driving transistor to be turned off.

10. The backlight module according to claim 8, wherein: The backlight module includes multiple first driving modules, each of which includes a first driving unit, multiple first connection ends and multiple second connection ends, the first connection end is electrically connected to the first end of one of the multiple second light-emitting columns, the multiple second connection ends are electrically connected to the first end of the third driving transistor, the first end of the sixth driving transistor and the second end of the first light-emitting column, respectively, and the first driving unit controls the potential of the second connection end to adjust the light brightness of the first light-emitting column and the second light-emitting column.

11. The backlight module according to claim 9, wherein: The backlight module includes multiple first driving modules, each of which includes a first driving unit, multiple first connection ends and multiple second connection ends, the first connection end is electrically connected to the first end of one of the multiple second light-emitting columns, the multiple second connection ends are electrically connected to the first end of the third driving transistor, the first end of the sixth driving transistor and the second end of the first light-emitting column, respectively, and the first driving unit controls the potential of the second connection end to adjust the light brightness of the first light-emitting column and the second light-emitting column.

12. A display device, comprising a first display area and a second display area surrounding the first display area, the display device comprising a backlight module, the backlight module comprising a first light-emitting area and a second light-emitting area surrounding the first light-emitting area, wherein: The backlight module includes at least one first light-emitting module and at least one second light-emitting module, at least one of the second light-emitting modules is arranged on the periphery of the first light-emitting module, at least one of the first light-emitting modules is located in the first light-emitting area, and at least one of the second light-emitting modules is located in the second light-emitting area; The first light-emitting module includes a plurality of first light strings, and the second light-emitting module includes a plurality of second light strings, wherein an arrangement density of the plurality of first light strings is greater than an arrangement density of the plurality of second light strings; The first light emitting module of the backlight module is located in the first display area, and the second light emitting module of the backlight module is located in the second display area.

13. The display device according to claim 12, wherein: The first light string includes a first light-emitting column, a second light-emitting column and a first switch unit, the first switch unit is electrically connected to the first end of the first light-emitting column, the first end of the second light-emitting column and the second end of the second light-emitting column, respectively, and the first switch unit selectively connects the first light-emitting column and the second light-emitting column in series or electrically connects the first end of the first light-emitting column and the first end of the second light-emitting column.

14. The display device according to claim 13, wherein: The first switch unit includes a first driving transistor, a second driving transistor and a third driving transistor, wherein the first end of the first driving transistor and the first end of the second driving transistor are electrically connected to the first end of the first light-emitting column respectively, the second end of the first driving transistor is electrically connected to the first end of the second light-emitting column, the second end of the second driving transistor and the second end of the third driving transistor are electrically connected to the second end of the second light-emitting column respectively, and the control end of the first driving transistor, the control end of the second driving transistor and the control end of the third driving transistor are all connected to a control signal; The first driving transistor is turned off, the second driving transistor is turned on, and the third driving transistor is turned off, so as to connect the first light-emitting column and the second light-emitting column in series; The first driving transistor is turned on, the second driving transistor is turned off, and the third driving transistor is turned on, so as to electrically connect the first end of the first light-emitting column with the first end of the second light-emitting column.

15. The display device according to claim 14, wherein: The backlight module further includes a control module, and the control module is electrically connected to the control end of the first driving transistor, the control end of the second driving transistor, and the control end of the third driving transistor respectively; The control module is used to generate a first control signal for controlling the first driving transistor to be turned off and the third driving transistor to be turned off, and to generate a second control signal for controlling the second driving transistor to be turned on; Alternatively, the control module is used to generate a third control signal for controlling the first driving transistor to be turned on and the third driving transistor to be turned on, and to generate a fourth control signal for controlling the second driving transistor to be turned off.

16. The display device according to claim 14, wherein: The backlight module also includes multiple first driving modules, each of which includes a first driving unit, multiple first connection ends and multiple second connection ends, the multiple first connection ends are respectively electrically connected to the first ends of the second light-emitting columns, the multiple second connection ends are respectively electrically connected to the first end of the third driving transistor and the second end of the first light-emitting column, and the first driving unit controls the potential of the second connection end to adjust the light-emitting brightness of the first light-emitting column and the second light-emitting column.

17. The display device according to claim 12, wherein: The first light string includes a first light-emitting column, a plurality of second light-emitting columns, a first switch unit, and at least one second switch unit, the first switch unit is electrically connected to a first end of the first light-emitting column, a first end of the second light-emitting column, and a second end of the second light-emitting column, respectively, the second switch unit is electrically connected to a first end of one of the second light-emitting columns, a first end of another of the second light-emitting columns, and a second end of another of the second light-emitting columns, respectively, and a second end of one of the second light-emitting columns is electrically connected to one of the first switch units or one of the second switch units; The first switch unit and the second switch unit selectively connect the first light-emitting column and a plurality of the second light-emitting columns in series or electrically connect a first end of the first light-emitting column with a plurality of first ends of the second light-emitting columns.

18. The display device according to claim 17, wherein: The first switch unit includes a first driving transistor, a second driving transistor and a third driving transistor, wherein the first end of the first driving transistor and the first end of the second driving transistor are electrically connected to the first end of the first light-emitting column respectively, the second end of the first driving transistor is electrically connected to the first end of the second light-emitting column, the second end of the second driving transistor and the second end of the third driving transistor are electrically connected to the second end of the second light-emitting column respectively, and the control end of the first driving transistor, the control end of the second driving transistor and the control end of the third driving transistor are all connected to a control signal; The second switch unit comprises a fourth driving transistor, a fifth driving transistor and a sixth driving transistor, wherein a first end of the fourth driving transistor and a first end of the fifth driving transistor are respectively electrically connected to a first end of one of the second light-emitting columns, a second end of the fourth driving transistor is electrically connected to a first end of another of the second light-emitting columns, a second end of the fifth driving transistor and a second end of the sixth driving transistor are respectively electrically connected to a second end of another of the second light-emitting columns, and a control end of the fourth driving transistor, a control end of the fifth driving transistor and a control end of the sixth driving transistor are all connected to the control signal; The first driving transistor is turned off, the second driving transistor is turned on, the third driving transistor is turned off, the fourth driving transistor is turned off, the fifth driving transistor is turned on, and the sixth driving transistor is turned off, so as to connect the first light-emitting column and a plurality of the second light-emitting columns in series; The first driving transistor is turned on, the second driving transistor is turned off, the third driving transistor is turned on, the fourth driving transistor is turned on, the fifth driving transistor is turned off, and the sixth driving transistor is turned on to electrically connect the first end of the first light-emitting column and the first ends of multiple second light-emitting columns.

19. The display device according to claim 18, wherein: The backlight module further includes a control module, which is electrically connected to the control end of the first driving transistor, the control end of the second driving transistor, the control end of the third driving transistor, the control end of the fourth driving transistor, the control end of the fifth driving transistor, and the control end of the sixth driving transistor respectively; The control module is used to generate a first control signal for controlling the first driving transistor to be turned off, the third driving transistor to be turned off, the fourth driving transistor to be turned off, and the sixth driving transistor to be turned off, and to generate a second control signal for controlling the second driving transistor to be turned on, and the fifth driving transistor to be turned on. Alternatively, the control module is used to generate a third control signal for controlling the first driving transistor to be turned on, the third driving transistor to be turned on, the fourth driving transistor to be turned on, and the sixth driving transistor to be turned on, and to generate a fourth control signal for controlling the second driving transistor to be turned off, and the fifth driving transistor to be turned off.

20. The display device according to claim 18, wherein: The backlight module includes multiple first driving modules, each of which includes a first driving unit, multiple first connection ends and multiple second connection ends, the first connection end is electrically connected to the first end of one of the multiple second light-emitting columns, the multiple second connection ends are electrically connected to the first end of the third driving transistor, the first end of the sixth driving transistor and the second end of the first light-emitting column, respectively, and the first driving unit controls the potential of the second connection end to adjust the light brightness of the first light-emitting column and the second light-emitting column.

Images