Backlight module, driving method thereof and display device

Abstract

The invention discloses a backlight module, a driving method thereof and a display device. The backlight module comprises a backlight source which comprises a light-emitting element; the driving chip comprises a first power supply end, a second power supply end and a third power supply end, and the time sequences of signals output by the first power supply end and the second power supply end are different; and the gating circuit is connected with the first pole of the light-emitting element, the first power supply end and the second power supply end, the second pole of the light-emitting element is connected with the third power supply end, and the gating circuit is configured to connect or disconnect the first power supply end with the first pole of the light-emitting element, or connect or disconnect the second power supply end with the first pole of the light-emitting element. According to the embodiment of the invention, the performance of the backlight module can be optimized.

Description

Technical Field

[0001] The present application relates to the field of display technologies, and particularly relates to a backlight module, a driving method thereof, and a display device. Background Art

[0002] A liquid crystal display device (LCD) includes a liquid crystal display panel and a backlight module. The backlight module includes a backlight, and the backlight is usually disposed on the back surface of the liquid crystal display panel. The backlight is generally divided into a direct-lit backlight and a side-lit backlight. Among them, the direct-lit backlight can adopt local dimming technology to achieve brightness zone control (i.e., zone dimming), so as to reduce the power consumption of the backlight and improve the display contrast of the liquid crystal display device.

[0003] Local Dimming has two backlight driving methods: direct drive and time-division drive. The direct drive method can provide a larger current to the LED lamp, and the brightness of the LED lamp is higher, but the number of required driving chips is more; although the time-division drive saves the number of driving chips, the effective current of the LED lamp is reduced, resulting in difficulty in increasing the brightness of the LED lamp. With the development of display technologies, people have higher and higher requirements for the performance of the backlight module. Therefore, how to diversify the backlight driving method to meet the requirements of various application scenarios is an urgent problem to be solved at present. Summary of the Invention

[0004] In view of this, the present invention provides a backlight module, a driving method thereof, and a display device, so as to solve the problem that the driving method of the backlight module is single and cannot meet the requirements of various application scenarios.

[0005] The present invention provides a backlight module, including: a backlight including a light-emitting element; a driving chip including a first power supply terminal, a second power supply terminal, and a third power supply terminal, wherein the signal timings output by the first power supply terminal and the second power supply terminal are different; a gating circuit connected to a first pole of the light-emitting element, the first power supply terminal, and the second power supply terminal, and a second pole of the light-emitting element is connected to the third power supply terminal. The gating circuit is configured to: connect or disconnect the first power supply terminal from the first pole of the light-emitting element, or connect or disconnect the second power supply terminal from the first pole of the light-emitting element.

[0006] The present invention further provides a driving method for a backlight module, which is used to drive the backlight module of the present invention; the method includes:

[0007] In a first working condition, controlling the gating circuit to connect the first power supply terminal to the first pole of the light-emitting element;

[0008] In a second working condition, controlling the gating circuit to connect the second power supply terminal to the first pole of the light-emitting element.

[0009] Based on the same inventive concept, the present invention also provides a display device, including the backlight module of the present invention.

[0010] Compared with the prior art, the backlight module, its driving method, and the display device provided by the present invention at least achieve the following beneficial effects:

[0011] The backlight module provided by the present invention includes: a backlight source including a light-emitting element; a driving chip including a first power supply terminal, a second power supply terminal, and a third power supply terminal, where the signal timings output by the first power supply terminal and the second power supply terminal are different; a gating circuit connected to the first pole of the light-emitting element, the first power supply terminal, and the second power supply terminal, and the second pole of the light-emitting element is connected to the third power supply terminal. The gating circuit is configured to: connect or disconnect the first power supply terminal and the first pole of the light-emitting element, or connect or disconnect the second power supply terminal and the first pole of the light-emitting element. When the gating circuit connects the first power supply terminal and the first pole of the light-emitting element, the signal output by the first power supply terminal is used to drive the light-emitting element to emit light. When the gating circuit connects the second power supply terminal and the first pole of the light-emitting element, the signal output by the second power supply terminal is used to drive the light-emitting element to emit light. Since the signal timings output by the first power supply terminal and the second power supply terminal are different, the corresponding driving methods of the first power supply terminal and the second power supply terminal are different. In this way, the driving method of the backlight module is diversified, which is beneficial to making the backlight module meet various application scenarios and improving the performance of the backlight module. Description of the Drawings

[0012] By reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, other features, objects, and advantages of the present application will become more obvious. Among them, the same or similar reference numerals represent the same or similar features, and the drawings are not drawn to actual scale.

[0013] Figure 1 Showing a schematic structural diagram of the backlight module provided by the present invention;

[0014] Figure 2 Showing a schematic timing diagram of the backlight module provided by the present invention;

[0015] Figure 3 Showing another schematic structural diagram of the backlight module provided by the present invention;

[0016] Figure 4 Showing another schematic timing diagram of the backlight module provided by the present invention;

[0017] Figure 5 Showing a schematic diagram of a display scenario provided by the present invention;

[0018] Figure 6Shows another timing diagram of the backlight module provided by the present invention;

[0019] Figure 7 Shows another timing diagram of the backlight module provided by the present invention;

[0020] Figure 8 Shows another timing diagram of the backlight module provided by the present invention;

[0021] Figure 9 Shows another timing diagram of the backlight module provided by the present invention;

[0022] Figure 10 Shows another timing diagram of the backlight module provided by the present invention;

[0023] Figure 11 Shows another timing diagram of the backlight module provided by the present invention;

[0024] Figure 12 Shows another timing diagram of the backlight module provided by the present invention;

[0025] Figure 13 Shows another timing diagram of the backlight module provided by the present invention;

[0026] Figure 14 Shows another timing diagram of the backlight module provided by the present invention;

[0027] Figure 15 Shows a flowchart of a driving method of the backlight module provided by the present invention;

[0028] Figure 16 Shows a structural diagram of a display device provided by the present invention. Detailed implementation manners

[0029] The features and exemplary embodiments of various aspects of the present application will be described in detail below. For the purpose of making the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present application and are not configured to limit the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only for providing a better understanding of the present application by showing examples of the present application.

[0030] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0031] It should be understood that the term "and / or" used in this text is only an associative relationship describing associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0032] The term "connection" can refer to "electrical connection" or "electrical connection without passing through an intermediate transistor". The term "drive" can refer to "control" or "operation". The term "part" can refer to "local". The display panel can be a display device or a module / part of a display device.

[0033] Without departing from the spirit or scope of the present application, various modifications and variations can be made to the present application, which will be obvious to those skilled in the art. Therefore, the present application is intended to cover modifications and variations of the present application that fall within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the embodiments provided in the embodiments of the present application can be combined with each other without conflict.

[0034] In the related art, the driving method of the backlight module is relatively single. For example, it only supports the time-sharing driving method, making the backlight module unable to meet various application scenarios.

[0035] In view of the above technical problems, the embodiments of the present application provide a backlight module, a driving method thereof, and a display device. The following will describe the embodiments of the backlight module, the driving method thereof, and the display device with reference to the accompanying drawings.

[0036] As Figure 1 shown, the backlight module 100 includes a backlight source 1, a driving chip 2, and a gating circuit 3.

[0037] The backlight source 1 includes a light-emitting element 11. The backlight source 1 can also be referred to as a backlight board.

[0038] Exemplarily, the light-emitting element 11 includes, but is not limited to, a light-emitting diode (LED).

[0039] The light-emitting element 11 includes a first pole and a second pole. For example, the first pole of the light-emitting element 11 is an anode, and the second pole of the light-emitting element 11 is a cathode.

[0040] Exemplarily, the backlight 1 includes a plurality of light-emitting elements 11, and the plurality of light-emitting elements 11 are arranged in an array.

[0041] The driving chip 2 includes a first power supply terminal VLED, a second power supply terminal SRC, and a third power supply terminal SNK. Among them, the signal timings output by the first power supply terminal VLED and the second power supply terminal SRC are different.

[0042] The gating circuit 3 is connected to the first pole of the light-emitting element 11, the first power supply terminal VLED, and the second power supply terminal SRC, and the second pole of the light-emitting element 11 is connected to the third power supply terminal SNK. The gating circuit 3 is configured to: connect or disconnect the first power supply terminal VLED and the first pole of the light-emitting element 11, or connect or disconnect the second power supply terminal SRC and the first pole of the light-emitting element 11.

[0043] Exemplarily, the second pole of the light-emitting element 11 and the third power supply terminal SNK can be directly connected through a connecting wire. That is to say, a switch may not be provided on the connecting path between the second pole of the light-emitting element 11 and the third power supply terminal SNK. In this case, the second pole of the light-emitting element 11 and the third power supply terminal SNK are always kept conducting.

[0044] The gating circuit 3 can selectively connect the first power supply terminal VLED and the second power supply terminal SRC of the driving chip 2 to the light-emitting element 11. It can be understood that when the gating circuit 3 connects the first power supply terminal VLED and the first pole of the light-emitting element 11, the second power supply terminal SRC and the first pole of the light-emitting element 11 are disconnected; when the gating circuit 3 connects the second power supply terminal SRC and the first pole of the light-emitting element 11, the first power supply terminal VLED and the first pole of the light-emitting element 11 are disconnected. In addition, when the light-emitting element is not required to emit light, the gating circuit 3 disconnects the first power supply terminal VLED and the first pole of the light-emitting element 11, and the gating circuit 3 disconnects the second power supply terminal SRC and the first pole of the light-emitting element 11.

[0045] Both the first power supply terminal VLED and the second power supply terminal SRC can output an effective voltage. There is a voltage difference between the effective voltage and the output voltage of the third power supply terminal SNK to light up the light-emitting element 11.

[0046] Exemplarily, when the first power supply terminal VLED is connected to the first pole of the light-emitting element 11, the output voltage of the first power supply terminal VLED and / or the output voltage of the third power supply terminal SNK can be adjusted by the driving chip 2 to adjust the brightness of the light-emitting element 11. When the second power supply terminal SRC is connected to the first pole of the light-emitting element 11, the output voltage of the second power supply terminal SRC and / or the output voltage of the third power supply terminal SNK can be adjusted by the driving chip 2 to adjust the brightness of the light-emitting element 11.

[0047] It should be noted that in each embodiment of the present application, the effective voltage output by the first power supply terminal VLED is taken as a high voltage, and the effective voltage output by the second power supply terminal SRC is taken as a high voltage as an example, which is not used to limit the present application.

[0048] According to the backlight module provided by the embodiment of the present application, when the gating circuit 3 connects the first power supply terminal VLED to the first pole of the light-emitting element 11, the signal output by the first power supply terminal VLED drives the light-emitting element 11 to emit light. When the gating circuit 3 connects the second power supply terminal SRC to the first pole of the light-emitting element 11, the signal output by the second power supply terminal SRC drives the light-emitting element 11 to emit light. The signal timings output by the first power supply terminal VLED and the second power supply terminal SRC are different, and the corresponding driving methods of the first power supply terminal VLED and the second power supply terminal SRC are different. In this way, the driving method of the backlight module is diversified, which is beneficial to enabling the backlight module to meet various application scenarios and improving the performance of the backlight module.

[0049] In some embodiments, as Figure 2 shown, within one frame time T, the durations of the effective voltages output by the first power supply terminal VLED and the second power supply terminal SRC are different.

[0050] Figure 2 In

[0051] As an example, within one frame time, the duration of the effective voltage output by the first power supply terminal VLED is greater than that of the effective voltage output by the second power supply terminal SRC, and the values of the effective voltages output by the first power supply terminal VLED and the second power supply terminal SRC are the same. In this example, the effective current when the first power supply terminal VLED drives the light-emitting element 11 is greater than the effective current when the second power supply terminal SRC drives the light-emitting element 11, such that the brightness of the light-emitting element 11 when driven by the first power supply terminal VLED is greater than the brightness of the light-emitting element 11 when driven by the second power supply terminal SRC. For example, in a high-brightness scenario, the light-emitting element 11 can be driven based on the first power supply terminal VLED; in a low-power consumption scenario, the light-emitting element 11 can be driven based on the second power supply terminal SRC, enabling the backlight module to simultaneously meet low-power consumption application scenarios and high-brightness application scenarios.

[0052] As another example, the values of the effective voltages output by the first power supply terminal VLED and the second power supply terminal SRC are different. For example, within one frame time, the durations of the effective voltages output by the first power supply terminal VLED and the second power supply terminal SRC are different, and the values of the effective voltages output by the first power supply terminal VLED and the second power supply terminal SRC are different. Or, within one frame time, the durations of the effective voltages output by the first power supply terminal VLED and the second power supply terminal SRC are the same, and the values of the effective voltages output by the first power supply terminal VLED and the second power supply terminal SRC are different.

[0053] Exemplarily, the output voltage of the third power supply terminal SNK can be adjusted by the driving chip 2 to ensure a constant current flowing through the light-emitting element 11.

[0054] In some embodiments, as Figure 3 shown, n light-emitting elements 11 form a light-emitting element group 10, n is an integer greater than 1, and n second power supply terminals form a power supply terminal group 20.

[0055] The gating circuit 3 is configured to: connect or disconnect the first power supply terminal VLED from the first poles of the n light-emitting elements 11 in the light-emitting element group 10, or connect or disconnect the n second power supply terminals SRC in the power supply terminal group 20 from the first poles of the n light-emitting elements 11 in the light-emitting element group 10 in a one-to-one correspondence. As Figure 4 shown, the n (e.g., n = 4) second power supply terminals SRC in the power supply terminal group 20 are used to output effective voltages in a time-division manner within one frame time T.

[0056] Figure 3 In it, the n light-emitting elements 11 in the same light-emitting element group 10 are respectively labeled as 11_1 to 11_n, and the n second power supply terminals SRC in the same power supply terminal group 20 are respectively labeled as SRC_1 to SRC_n.

[0057] The backlight may include a plurality of light-emitting element groups 10. One light-emitting element group 10 can be understood as a partition of the backlight. That is to say, the backlight may include a plurality of partitions.

[0058] Exemplarily, please refer to Figure 3 and Figure 4 , Figure 4 Taking n = 4 as an example in, under the first working condition f1, the gating circuit 3 connects the first power supply terminal VLED to the first poles of 4 light-emitting elements 11_1 to 11_4 in the light-emitting element group 10. In this case, the effective voltage output by the first power supply terminal VLED drives the 4 light-emitting elements 11_1 to 11_4 to emit light simultaneously. Under the second working condition f2, the gating circuit 3 connects the second power supply terminal SRC_1 to the light-emitting element 11_1, connects the second power supply terminal SRC_2 to the light-emitting element 11_2, connects the second power supply terminal SRC_3 to the light-emitting element 11_3, and connects the second power supply terminal SRC_4 to the light-emitting element 11_4. The effective voltage output by the second power supply terminal SRC_1 drives the light-emitting element 11_1 to emit light, the effective voltage output by the second power supply terminal SRC_2 drives the light-emitting element 11_2 to emit light, the effective voltage output by the second power supply terminal SRC_3 drives the light-emitting element 11_3 to emit light, and the effective voltage output by the second power supply terminal SRC_4 drives the light-emitting element 11_4 to emit light. The 4 second power supply terminals SRC_1 to SRC_4 output effective voltages in a time-division manner within a frame time T, so that the 4 light-emitting elements 11_1 to 11_4 emit light in a time-division manner within a frame time. In addition, the maximum average light-emitting duration of the 4 light-emitting elements 11_1 to 11_4 is one-fourth of the frame duration. The driving method corresponding to the first working condition f1 can be understood as a direct driving method, and the driving method corresponding to the second working condition f2 can be understood as a time-division driving method, so that the backlight module supports the direct driving method and the time-division driving method to meet different scenario requirements.

[0059] Exemplarily, when the backlight module starts to work, it is default to work in the second working condition and switches to the first working condition when the trigger signal jumps.

[0060] It should be noted that Figure 4 taking n = 4 as an example in for illustration, this is not used to limit the present application. In other examples, n can also be equal to 2, 3 or other values.

[0061] In some embodiments, please refer to Figure 3 and Figure 4 , within a frame time T, the duration of the effective voltage output by the first power supply terminal VLED is greater than the duration of the effective voltage output by any one of the second power supply terminals in the power supply terminal group 20 (for example, any one of SRC_1 to SRC_4).

[0062] Exemplarily, within one frame time T, the durations of the valid levels output by the n second power terminals SRC in the power terminal group 20 are the same. For example, within one frame time T, the durations of the valid levels output by the n second power terminals SRC in the power terminal group 20 are all approximately 1 / n of the frame duration.

[0063] Exemplarily, within one frame time T, the duration of the valid voltage output by the first power terminal VLED may be equal to the duration of one frame.

[0064] In this embodiment, within one frame time, the duration of the valid voltage output by the first power terminal VLED is longer, and the effective current when the first power terminal VLED drives the light-emitting element 11 is greater than the effective current when the second power terminal SRC drives the light-emitting element 11. Under the drive of the first power terminal VLED, the brightness of the light-emitting element 11 can be improved.

[0065] For example, in an in-vehicle instrument display device, as Figure 5 shown, for the light-emitting elements within the target area 12, they can be driven based on the first power terminal VLED. For the alarm lights / Icon icon screens in the target area that need to be highlighted, the brightness of the alarm lights / Icon icon screens can be increased to improve driving safety.

[0066] In some embodiments, please refer to Figure 3 and Figure 4 , within one frame time T, the duration of the valid voltage output by the first power terminal VLED is equal to the sum of the durations of the valid voltages output by the n second power terminals (such as any one of SRC_1 to SRC_4) in the power terminal group 20.

[0067] Exemplarily, within one frame time T, the first power terminal VLED always outputs a valid voltage. For example, the first power terminal VLED of the driving chip 2 is electrically connected to a power chip (Power IC), and the power chip supplies power to the driving chip 2 through the first power terminal VLED. As long as the power chip can output a voltage, the first power terminal VLED can always maintain a valid voltage. In this example, the first power terminal VLED of the driving chip 2 is electrically connected to the power chip (Power IC), and the first power terminal VLED of the driving chip 2 is electrically connected to the light-emitting element 11 through the gating circuit 3. It is equivalent to using the original power terminal on the driving chip as the first power terminal VLED that can drive the light-emitting element 11. In this way, it is not necessary to change the hardware structure of the driving chip, and only the driving timing of the driving chip needs to be improved.

[0068] In some embodiments, as Figure 6As shown, the gating circuit includes a multiplexer 31. The first input terminal in1 of the multiplexer 31 is connected to the first power supply terminal VLED, the second input terminal in2 of the multiplexer 31 is connected to the second power supply terminal SRC, and the output terminal out of the multiplexer 31 is connected to the first pole of the light-emitting element 11.

[0069] A multiplexer has multiple input terminals, an output terminal, and a control circuit. The control circuit selects different input signals at different time intervals according to certain rules and connects them to the output terminal so that these input signals can be time-division multiplexed on the same transmission line.

[0070] For example, the multiplexer 31 further includes a control terminal sw. The control terminal sw is used to access a control signal, and the control signal is used to selectively connect the first input terminal in1 to the output terminal out, or connect the second input terminal in2 to the output terminal out.

[0071] When the first input terminal in1 and the output terminal out of the multiplexer 31 are connected, the signal of the first power supply terminal VLED is transmitted to the first pole of the light-emitting element 11 through the first input terminal in1 and the output terminal out, and the first power supply terminal VLED drives the light-emitting element 11 to emit light.

[0072] When the second input terminal in2 and the output terminal out of the multiplexer 31 are connected, the signal of the second power supply terminal SRC is transmitted to the first pole of the light-emitting element 11 through the second input terminal in2 and the output terminal out, and the second power supply terminal SRC drives the light-emitting element 11 to emit light.

[0073] In this embodiment, the gating circuit includes a multiplexer 31. The multiplexer 31 can selectively connect the first power supply terminal VLED to the first pole of the light-emitting element 11, or connect the second power supply terminal SRC to the first pole of the light-emitting element 11, so as to drive the light-emitting element 11 based on the driving modes corresponding to the first power supply terminal VLED and the second power supply terminal SRC respectively.

[0074] Exemplarily, the control terminal sw of the multiplexer 31 is electrically connected to the control signal terminal SW of the driving chip 2, or the control terminal of the multiplexer is electrically connected to the control signal terminal of the timing chip (Tcon IC), or the backlight module is the backlight module of a vehicle display device, and the control terminal of the multiplexer is electrically connected to the control signal terminal of the vehicle control unit (VCU).

[0075] In some embodiments, as Figure 7 shown, n light-emitting elements form a light-emitting element group 10, n is an integer greater than 1, and n second power supply terminals form a power supply terminal group 20. Figure 7Among them, the n light-emitting elements of the same light-emitting element group are respectively labeled as 11_1 to 11_n, and the n second power supply terminals in the same power supply terminal group 20 are respectively labeled as SRC_1 to SRC_n.

[0076] The gating circuit includes n multiplexers, namely multiplexers 31_1 to 31_n. The first input terminal in1 of each multiplexer is connected to the first power supply terminal VLED. The second input terminals in2 of the n multiplexers are connected to the n second power supply terminals SRC_1 to SRC_n in the power supply terminal group 20 in a one-to-one correspondence. The output terminals out of the n multiplexers are connected to the first poles of the n light-emitting elements in the light-emitting element group 10 in a one-to-one correspondence.

[0077] For example, the first input terminal in1 of the multiplexer 31_1 is connected to the first power supply terminal VLED, the second input terminal in2 of the multiplexer 31_1 is connected to the second power supply terminal SRC_1, and the output terminal of the multiplexer 31_1 is connected to the first pole of the light-emitting element 11_1. The first input terminal in1 of the multiplexer 31_2 is connected to the first power supply terminal VLED, the second input terminal in2 of the multiplexer 31_2 is connected to the second power supply terminal SRC_2, and the output terminal of the multiplexer 31_2 is connected to the first pole of the light-emitting element 11_2. And so on, the first input terminal in1 of the multiplexer 31_n is connected to the first power supply terminal VLED, the second input terminal in2 of the multiplexer 31_n is connected to the second power supply terminal SRC _ n, and the output terminal of the multiplexer 31_n is connected to the first pole of the light-emitting element 11 _ n. n is an integer greater than 1. For example, n is 2, 3, 4, etc.

[0078] When the first input terminals in1 and the output terminals out of the multiplexers 31_1 to 31_n are connected, the signal of the first power supply terminal VLED is transmitted to the first poles of the light-emitting elements 11_1 to the light-emitting element 11 _ n through the first input terminal in1 and the output terminal out. The first power supply terminal VLED drives the light-emitting elements 11_1 to the light-emitting elements 11_n to emit light simultaneously.

[0079] Exemplarily, the first power supply terminal VLED maintains an effective level output within one frame time, and the first power supply terminal VLED drives the light-emitting elements 11_1 to the light-emitting elements 11 _ n to emit light all the time within one frame time.

[0080] When the second input terminal in2 and the output terminal out of the multiplexers 31_1 to 31_n are connected, the signal of the second power supply terminal SRC_1 is transmitted to the first pole of the light-emitting element 11_1 through the second input terminal in2 and the output terminal out of the multiplexer 31_1, and the second power supply terminal SRC_1 drives the light-emitting element 11_1 to emit light; the signal of the second power supply terminal SRC _ n is transmitted to the first pole of the light-emitting element 11 _ n through the second input terminal in2 and the output terminal out of the multiplexer 31_n, and the second power supply terminal SRC _ n drives the light-emitting element 11_n to emit light. The second power supply terminals SRC_1 to SRC _ n within the same power supply terminal group 20 sequentially output valid levels within one frame time, and the light-emitting elements 11_1 to 11_n emit light sequentially.

[0081] In this embodiment, corresponding to the n light-emitting elements of the light-emitting element group 10, the gating circuit includes n multiplexers 31_1 to 31_n, and the power supply terminal group 20 includes n second power supply terminals SRC_1 to SRC _ n, and the signals output by the n second power supply terminals SRC_1 to SRC _ n can be transmitted to the n light-emitting elements 11_1 to 11_n one by one through the n multiplexers 31_1 to 31_n to realize time-division driving of the n light-emitting elements 11_1 to 11_n to emit light sequentially; the signals output by the first power supply terminal VLED can be transmitted to the n light-emitting elements 11_1 to 11_n through the n multiplexers 31_1 to 31_n to realize direct driving of the n light-emitting elements 11_1 to 11_n to emit light simultaneously.

[0082] In some embodiments, the n multiplexers 31_1 to 31_n each include control terminals sw_1 to sw_n. As Figure 7 shown, the control terminal of the multiplexer 31_1 is marked as sw_1, and the control terminal of the multiplexer 31_n is marked as sw_n. The control terminals sw_1 to sw_n of the n multiplexers 31_1 to 31_n are electrically connected to each other.

[0083] In this case, the control signals accessed by the control terminals sw_1 to sw_n of the n multiplexers 31_1 to 31_n are the same, and the gating states of the multiplexers 31_1 to 31_n are also the same.

[0084] For example, in the first working condition, the first input terminals in1 and the output terminals out of the n multiplexers 31_1 to 31_n are all connected. In this case, the first power supply terminal VLED drives the n light-emitting elements in the light-emitting element group 10 to emit light simultaneously.

[0085] For another example, in the second operating condition, the second input terminals in2 of the n multiplexers 31_1 to 31_n are all connected to the output terminal out. In this case, the n second power supply terminals SRC_1 to SRC_n are connected to the n light-emitting elements 11_1 to 11_n in the light-emitting element group 10 in a one-to-one correspondence, and the n second power supply terminals SRC_1 to SRC_n output valid levels at different times to drive the n light-emitting elements 11_1 to 11_n to emit light at different times.

[0086] In this embodiment, by designing the control terminals sw_1 to sw_n of the n multiplexers 31_1 to 31_n to be electrically connected to each other, the driving timing can be simplified.

[0087] In some embodiments, the n multiplexers 31_1 to 31_n all include control terminals. As Figure 7 shown, the control terminal of the multiplexer 31_1 is marked as sw_1, and the control terminal of the multiplexer 31_n is marked as sw_n. The control terminals of at least two of the n multiplexers 31_1 to 31_n are independent of each other.

[0088] For the multiplexers with independent control terminals, the signals accessed by their control terminals can be different, and their gating states can also be different.

[0089] Please refer to Figure 4 and Figure 8 . Taking the light-emitting element group 10 connected to the third power supply terminal SNK_1 as an example with n = 4, the following is an introduction:

[0090] In the four-time division driving scenario, the second input terminals in2 of the 4 multiplexers 31_1 to 31_4 are all connected to the output terminal out. In this case, the 4 second power supply terminals SRC_1 to SRC_4 are connected to the 4 light-emitting elements 11_1 to 11_4 in the light-emitting element group 10 in a one-to-one correspondence, and the 4 second power supply terminals SRC_1 to SRC_4 output valid levels at different times to drive the 4 light-emitting elements 11_1 to 11_4 to emit light at different times.

[0091] In the first scenario, the first input terminals in1 of the 4 multiplexers 31_1 to 31_4 are all connected to the output terminal out. In this case, the first power supply terminal VLED drives the 4 light-emitting elements 11_1 to 11_4 in the light-emitting element group 10 to emit light simultaneously. The effective current on SNK_1 in the first scenario is about 4 times the effective current on SNK_1 in the four-time division driving scenario.

[0092] In the second scenario, all three multiplexers 31_1 to 31_3 connect the first input terminal in1 to the output terminal out, and the first power supply terminal VLED drives three light-emitting elements 11_1 to 11_3 in the light-emitting element group 10 to emit light simultaneously. Additionally, the multiplexer 31_4 connects the second input terminal in2 to the output terminal out, and the second power supply terminal SRC_4 drives the light-emitting element 11_4 to emit light. The light-emitting duration of the light-emitting element 11_4 is one-fourth of the light-emitting duration of the light-emitting element 11_1. The effective current on SNK_1 in the second scenario is approximately 3.25 times the effective current on SNK_1 in the four-time driving scenario.

[0093] In the third scenario, two multiplexers 31_1 to 31_2 connect the first input terminal in1 to the output terminal out, and the first power supply terminal VLED drives two light-emitting elements 11_1 to 11_2 in the light-emitting element group 10 to emit light simultaneously. Additionally, multiplexers 31_3 to 31_4 connect the second input terminal in2 to the output terminal out, and the second power supply terminals SRC_3 to SRC_4 drive the light-emitting elements 11_3 to 11_4 to emit light. The light-emitting duration of the light-emitting element 11_3 is one-fourth of the light-emitting duration of the light-emitting element 11_1, and the light-emitting duration of the light-emitting element 11_4 is one-fourth of the light-emitting duration of the light-emitting element 11_1. The effective current on SNK_1 in the third scenario is approximately 2.5 times the effective current on SNK_1 in the four-time driving scenario.

[0094] In the fourth scenario, the multiplexer 31_1 connects the first input terminal in1 to the output terminal out, and the first power supply terminal VLED drives the light-emitting element 11_1 in the light-emitting element group 10 to emit light. Additionally, multiplexers 31_2 to 31_4 connect the second input terminal in2 to the output terminal out, and the second power supply terminals SRC_2 to SRC_4 drive the light-emitting elements 11_2 to 11_4 to emit light in a time-division manner. The light-emitting duration of the light-emitting element 11_2 is one-fourth of the light-emitting duration of the light-emitting element 11_1, the light-emitting duration of the light-emitting element 11_3 is one-fourth of the light-emitting duration of the light-emitting element 11_1, and the light-emitting duration of the light-emitting element 11_4 is one-fourth of the light-emitting duration of the light-emitting element 11_1. The effective current on SNK_1 in the fourth scenario is approximately 1.75 times the effective current on SNK_1 in the four-time driving scenario.

[0095] It should be noted that in the examples of the above second to fourth scenarios, it is exemplarily specified which first input terminal and output terminal of which multiplexer are connected, and which second input terminal and output terminal of which multiplexer are connected. These are only examples and are not used to limit this application. It is possible to connect the first input terminal and the output terminal of any multiplexer, and connect the second input terminal and the output terminal of other multiplexers. Or, according to actual requirements, it can be selected which first input terminal and output terminal of which multiplexer are connected, and which second input terminal and output terminal of which multiplexer are connected.

[0096] It can be understood that when the effective current on the third power supply terminal SNK is different, the brightness of the light-emitting element connected thereto is different.

[0097] Exemplarily, when the control terminals sw_1 to sw_n of each multiplexer among the n multiplexers 31_1 to 31_n are all independent of each other, the effective current on SNK_1 in the target scenario is about k times the effective current on SNK_1 in the n-time division driving scenario, where k = (n * p + (n - p)) / n, 1 ≤ p ≤ n. In the target scenario, p multiplexers have their first input terminal in1 and output terminal out connected, and n - p multiplexers have their second input terminal in2 and output terminal out connected. In the n-time division driving scenario, all n multiplexers have their second input terminal in2 and output terminal out connected, and the duration of the effective level output by each multiplexer among the n multiplexers 31_1 to 31_n within one frame time is 1 / n of the frame duration. In this application, the symbol "*" represents multiplication, and the symbol " / " represents division.

[0098] In this embodiment, by designing that the control terminals of at least two multiplexers among the n multiplexers 31_1 to 31_n are all independent of each other, the brightness of the light-emitting element can be adjusted more flexibly to suit more application scenarios.

[0099] In some other embodiments, as Figure 9 shown, the gating circuit includes a first switch T1 and a second switch T2;

[0100] The first end of the first switch T1 is connected to the first power supply terminal VLED, the second end of the first switch T1 is connected to the first pole of the light-emitting element 11, the first end of the second switch T2 is connected to the second power supply terminal SRC, and the second end of the second switch T2 is connected to the first pole of the light-emitting element 11;

[0101] The control terminal sw1 of the first switch T1 and the control terminal sw2 of the second switch T2 are independent of each other.

[0102] Exemplarily, the first switch and the second switch include but are not limited to thin-film transistors, triodes, etc.

[0103] For example, both the first switch and the second switch are thin-film transistors. The first pole of the thin-film transistor is the first end of the switch, the second pole of the thin-film transistor is the second end of the switch, and the gate of the thin-film transistor is the control end of the switch.

[0104] The control ends are independent switches, the signals applied to their control ends can be different, and their gating states are different.

[0105] It can be understood that when the first switch T1 is turned on, the second switch T2 is turned off; when the second switch T2 is turned on, the first switch T1 is turned off, so as to avoid signal crosstalk between the first power supply terminal VLED and the second power supply terminal SRC.

[0106] When the first switch T1 is turned on and the second switch T2 is turned off, the signal of the first power supply terminal VLED is transmitted to the first pole of the light-emitting element 11 through the first switch T1, and the first power supply terminal VLED drives the light-emitting element 11 to emit light.

[0107] When the second switch T2 is turned on and the first switch T1 is turned off, the signal of the second power supply terminal SRC is transmitted to the first pole of the light-emitting element 11 through the second switch T2, and the second power supply terminal SRC drives the light-emitting element 11 to emit light.

[0108] In this embodiment, the gating circuit includes a first switch T1 and a second switch T2. The first switch T1 connects the first power supply terminal VLED and the first pole of the light-emitting element 11, or the second switch T2 connects the second power supply terminal SRC and the first pole of the light-emitting element 11, so as to drive the light-emitting element 11 based on the driving methods corresponding to the first power supply terminal VLED and the second power supply terminal SRC respectively.

[0109] Exemplarily, the control end of the first switch T1 and the control end of the second switch T2 are electrically connected to different control signal terminals of a driving chip, or the control end of the first switch T1 and the control end of the second switch T2 are electrically connected to different control signal terminals of a timing chip (Tcon IC), or the backlight module is a backlight module of a vehicle display device, and the control end of the first switch T1 and the control end of the second switch T2 are electrically connected to different control signal terminals of a vehicle control unit (VCU).

[0110] As an example, the gating circuit may include a first switch T1 and a second switch T2.

[0111] As another example, as Figure 10 shown, n light-emitting elements form a light-emitting element group 10, n is an integer greater than 1, and n second power supply terminals form a power supply terminal group 20. Figure 10Among them, the n light-emitting elements of the same light-emitting element group are respectively marked as 11_1 to 11_n, and the n second power supply terminals in the same power supply terminal group 20 are respectively marked as SRC_1 to SRC_n. n is an integer greater than 1. For example, n is 2, 3, 4, etc.

[0112] The gating circuit includes n first switches T1 and n second switches T2; the first ends of the n first switches T1 are all connected to the first power supply terminal VLED, and the second ends of the n first switches T1 are respectively connected to the first poles of the n light-emitting elements in the light-emitting element group 10 in one-to-one correspondence; the first ends of the n second switches T2 are respectively connected to the n second power supply terminals SRC in the power supply terminal group 20 in one-to-one correspondence, and the second ends of the n second switches T2 are respectively connected to the first poles of the n light-emitting elements in the light-emitting element group 10 in one-to-one correspondence.

[0113] For example, the n first switches are respectively T1_1 to T1_n, and the n second switches are respectively T2_1 to T2_n. The first end of the first switch T1_1 is connected to the first power supply terminal VLED, and the second end of the first switch T1_1 is connected to the first pole of the light-emitting element 11_1; the first end of the second switch T1_2 is connected to the second power supply terminal SRC_1, and the second end of the second switch T1_2 is connected to the first pole of the light-emitting element 11_1. And so on, the first end of the first switch T1_n is connected to the first power supply terminal VLED, and the second end of the first switch T1_n is connected to the first pole of the light-emitting element 11_n; the first end of the second switch T1_n is connected to the second power supply terminal SRC_n, and the second end of the second switch T1_n is connected to the first pole of the light-emitting element 11_n.

[0114] When the first switch T1_1 to the first switch T1_n are turned on and the second switch T1_1 to the second switch T1_n are turned off, the signals of the first power supply terminal VLED are respectively transmitted to the first poles of the light-emitting elements 11_1 to 11_n through the first switch T1_1 to the first switch T1_n, and the first power supply terminal VLED drives the light-emitting elements 11 to 11_n to emit light simultaneously.

[0115] Exemplarily, the first power supply terminal VLED maintains an effective level output within one frame time, and the first power supply terminal VLED drives the light-emitting elements 11 to 11_n to emit light all the time within one frame time.

[0116] When the second switches T1_1 to T1_n are turned on and the first switches T1_1 to T1_n are turned off, the signal of the second power supply terminal SRC_1 is transmitted to the first pole of the light-emitting element 11_1 through the second switch T1_1, and the second power supply terminal SRC_1 drives the light-emitting element 11_1 to emit light; the signal of the second power supply terminal SRC_n is transmitted to the first pole of the light-emitting element 11_n through the second switch T1_n, and the second power supply terminal SRC_n drives the light-emitting element 11_n to emit light. The second power supply terminals SRC_1 to SRC_n within the same power supply terminal group 20 sequentially output valid levels within one frame time, and the light-emitting elements 11 to 11_n emit light sequentially.

[0117] In this embodiment, corresponding to the n light-emitting elements of the light-emitting element group, the gating circuit includes n first switches and n second switches, the power supply terminal group includes n second power supply terminals, and the signals output by the n second power supply terminals can be transmitted to the n light-emitting elements one by one through the n second switches to realize time-division driving of the n light-emitting elements to emit light sequentially; the signal output by the first power supply terminal can be transmitted to the n light-emitting elements through the n first switches to realize direct driving of the n light-emitting elements to emit light simultaneously.

[0118] As an example, the control terminals sw1_1 to sw1_n of the n first switches T1_1 to T1_n are electrically connected to each other, and the control terminals sw2_1 to sw2_n of the n second switches T2_1 to T2_n are electrically connected to each other.

[0119] In this case, the control signals accessed by the control terminals sw1_1 to sw1_n of the n first switches T1_1 to T1_n are the same, and the control signals accessed by the control terminals sw2_1 to sw2_n of the n second switches T2_1 to T2_n are the same. The signals accessed by the control terminals sw1_1 to sw1_n of the n first switches T1_1 to T1_n and the control terminals sw2_1 to sw2_n of the n second switches T2_1 to T2_n can be different.

[0120] For example, in the first working condition, the n first switches T1_1 to T1_n are all turned on, and the n second switches T2_1 to T2_n are all turned off. In this case, the first power supply terminal VLED drives the n light-emitting elements in the light-emitting element group 10 to emit light simultaneously.

[0121] For another example, in the second working condition, the n second switches T2_1 to T2_n are all turned on, and the n first switches T1_1 to T1_n are all turned off. In this case, the n second power supply terminals SRC_1 to SRC_n and the n light-emitting elements 11_1 to 11_n in the light-emitting element group 10 are connected in one-to-one correspondence, and the n second power supply terminals SRC_1 to SRC_n output valid levels in a time-division manner to drive the n light-emitting elements 11_1 to 11_n to emit light in a time-division manner.

[0122] In this embodiment, by designing the control terminals sw1_1 to sw1_n of the n first switches T1_1 to T1_n to be electrically connected to each other and the control terminals sw2_1 to sw2_n of the n second switches T2_1 to T2_n to be electrically connected to each other, the driving timing can be simplified.

[0123] As another example, the control terminals of at least two of the n first switches T1_1 to T1_n are independent of each other, and the control terminals of at least two of the n second switches T2_1 to T2_n are independent of each other.

[0124] For the first switches with independent control terminals, the signals applied to their control terminals can be different, and their states can also be different. For the second switches with independent control terminals, the signals applied to their control terminals can be different, and their states can also be different.

[0125] Please refer to Figure 11 and Figure 1 _2. Taking n = 2 and the light-emitting element group 10 connected to the third power supply terminal SNK_1 as an example, the following is an introduction:

[0126] In the two-time driving scenario, the first switches T1_1 to T1_2 are turned off, and the second switches T2_1 to T2_2 are turned on. In this case, the two second power supply terminals SRC_1 to SRC_2 and the two light-emitting elements 11_1 to 11_2 in the light-emitting element group 10 are connected in one-to-one correspondence, and the two second power supply terminals SRC_1 to SRC_2 output valid levels in a time-sharing manner to drive the two light-emitting elements 11_1 to 11_2 to emit light in a time-sharing manner.

[0127] In the fifth scenario, the first switches T1_1 to T1_2 are turned on, and the second switches T2_1 to T2_2 are turned off. In this case, the first power supply terminal VLED drives the two light-emitting elements 11_1 to 11_2 in the light-emitting element group 10 to emit light simultaneously. The effective current on SNK_1 in the fifth scenario is about twice the effective current on SNK_1 in the two-time driving scenario.

[0128] In the sixth scenario, the first switch T1_1 is turned on, the first switch T1_2 is turned off, the second switch T2_1 is turned off, and the second switch T2_2 is turned on. In this case, the first power supply terminal VLED drives the light-emitting element 11_1 in the light-emitting element group 10 to emit light, and the second power supply terminal SRC_2 drives the light-emitting element 11_2 to emit light. The light-emitting duration of the light-emitting element 11_2 is one-half of the light-emitting duration of the light-emitting element 11_1. The effective current on SNK_1 in the sixth scenario is about 1.5 times the effective current on SNK_1 in the two-time driving scenario.

[0129] In this embodiment, by designing that the control terminals of at least two of the n first switches T1_1 to T1_n are independent of each other, and the control terminals of at least two of the n second switches T2_1 to T2_n are independent of each other, the brightness of the light-emitting element can be adjusted more flexibly to suit more application scenarios.

[0130] Exemplarily, the gating circuit 3 in each embodiment of the present application may be located in the backlight 1, or the gating circuit 3 is located inside the driving chip 2, or the gating circuit 3 is located on a Printed Circuit Board (PCB). In this way, the integration degree of the entire backlight module can be higher and the complexity can be reduced.

[0131] In some embodiments, as Figure 3 shown, the backlight includes a plurality of light-emitting element groups 10, and a power terminal group 20 is electrically connected to at least two light-emitting element groups 10 through the gating circuit 3.

[0132] In other words, one power terminal group 20 can be used to drive a plurality of light-emitting element groups 10. In this way, the number of power terminal groups 20 can be saved, that is, the number of the second power terminals SRC is saved, and the cost of the driving chip is reduced.

[0133] Exemplarily, the driving chip 2 includes a power terminal group 20, and the power terminal group 20 is electrically connected to all the light-emitting element groups 10 of the backlight through the gating circuit 3.

[0134] As an example, as Figure 13 shown, the light-emitting element group 10 includes two light-emitting elements 11_1 and 11_2. Correspondingly, the power terminal group includes two second power terminals, which are SRC_1 and SRC_2 respectively. The second power terminal SRC_1 is electrically connected to the first pole of the first light-emitting element 11_1 in the light-emitting element group 10, and the second power terminal SRC_2 is electrically connected to the first pole of the second light-emitting element 11_2 in the light-emitting element group 10. Figure 13 In the shown example, one power terminal group is electrically connected to all the light-emitting element groups 10.

[0135] As an example, as Figure 14 shown, the light-emitting element group 10 includes four light-emitting elements 11_1 to 11_4. Correspondingly, the power terminal group includes four second power terminals, which are SRC_1, SRC_2, SRC_3, and SRC_4 respectively. The second power terminal SRC_1 is electrically connected to the first pole of the first light-emitting element 11_1 in the light-emitting element group 10, the second power terminal SRC_2 is electrically connected to the first pole of the second light-emitting element 11_2 in the light-emitting element group 10, the second power terminal SRC_3 is electrically connected to the first pole of the third light-emitting element 11_3 in the light-emitting element group 10, and the second power terminal SRC_4 It is electrically connected to the first pole of the fourth light-emitting element 11_4 in the light-emitting element group 10. Figure 14 In the illustrated example, a power supply terminal group is electrically connected to all the light-emitting element groups 10.

[0136] As Figure 13 or Figure 14 shown, one light-emitting element group 10 corresponds to one partition. In this embodiment, it is equivalent to dividing the backlight source into multiple partitions. It should be noted that Figure 13 and Figure 14 the partition methods shown are only exemplary and are not used to limit this application.

[0137] In some embodiments, as Figure 3 shown, the third power supply terminal SNK is connected to the second poles of at least two light-emitting elements 11 in the light-emitting element group 20.

[0138] Exemplarily, the third power supply terminal SNK is connected to the second poles of n light-emitting elements 11 in the light-emitting element group 20. In this way, the number of third power supply terminals can be reduced, and the cost of the driving chip can be reduced.

[0139] In some embodiments, as Figure 3 shown, the backlight source includes m light-emitting element groups 10, the driving chip 2 includes m third power supply terminals, and the m third power supply terminals are respectively SNK_1 to SNK _ m, where m is an integer greater than 1, and the m third power supply terminals are connected to the m light-emitting element groups in one-to-one correspondence.

[0140] For example, the third power supply terminal SNK_1 is connected to the second poles of n light-emitting elements in the first light-emitting element group 10; the third power supply terminal SNK_2 is connected to the second poles of n light-emitting elements in the second light-emitting element group 10; the third power supply terminal SNK_m is connected to the second poles of n light-emitting elements in the mth light-emitting element group 10.

[0141] If the second poles of all the light-emitting elements 11 of the backlight source are connected to the same third power supply terminal SNK, the current applied to the third power supply terminal SNK will be relatively large, and the performance requirements for the driving chip will be relatively high. In this embodiment, different light-emitting element groups 10 are connected to different third power supply terminals SNK, and the requirement for the current-carrying capacity of a single third power supply terminal SNK can be reduced, so that the cost of the driving chip can be reduced.

[0142] In some embodiments, as Figure 3 shown, the ith light-emitting element group 10_i is connected to the ith third power supply terminal SNK_i, and the jth light-emitting element group 10_j is connected to the jth third power supply terminal SNK_j, where i≠j, and i and j are any two values from 1 to m.

[0143] In the first operating condition, the gating circuit 3 is configured to connect the i-th light-emitting element group 10_i and the j-th light-emitting element group 10_j to the first power supply terminal VLED; and in the first operating condition, the i-th third power supply terminal SNK_i outputs power, and the j-th third power supply terminal SNK_j is in a floating state.

[0144] The j-th light-emitting element group 10_j is connected to the first power supply terminal VLED, but the j-th third power supply terminal SNK_j is in a floating state, the path where the j-th light-emitting element group 10_j is located is disconnected, and the j-th light-emitting element group 10_j does not emit light.

[0145] When the i-th light-emitting element group 10_i is connected to the first power supply terminal VLED and the i-th third power supply terminal SNK_i outputs power, the i-th light-emitting element group 10_i is on the path, and the i-th light-emitting element group 10_i is driven by the first power supply terminal VLED to emit light. For example, the first power supply terminal VLED maintains an effective level output within one frame, so that the i-th light-emitting element group 10_i can emit light continuously within one frame, the effective current of the i-th light-emitting element group 10_i is increased, and the brightness of the i-th light-emitting element group 10_i is also increased. In this way, the purpose of local brightening can be achieved.

[0146] Exemplarily, the alarm light / Icon icon screen in the area where the i-th light-emitting element group 10_i is located needs to be highlighted, which can increase the brightness of the alarm light / Icon icon screen to improve driving safety.

[0147] Based on the same technical concept, the embodiment of the present application also provides a driving method for a backlight module, which is used to drive the backlight module described in any one of the above embodiments.

[0148] As Figure 15 shown, the driving method for the backlight module provided by the embodiment of the present application includes S1501 to S1502:

[0149] S1501, in the first operating condition, control the gating circuit to connect the first power supply terminal to the first pole of the light-emitting element;

[0150] S1502, in the second operating condition, control the gating circuit to connect the second power supply terminal to the first pole of the light-emitting element.

[0151] According to the driving method of the backlight module provided by the embodiments of the present application, when the gating circuit 3 connects the first power supply terminal VLED to the first pole of the light-emitting element 11, the signal output by the first power supply terminal VLED drives the light-emitting element 11 to emit light. When the gating circuit 3 connects the second power supply terminal SRC to the first pole of the light-emitting element 11, the signal output by the second power supply terminal SRC drives the light-emitting element 11 to emit light. The signal timings output by the first power supply terminal VLED and the second power supply terminal SRC are different, and the corresponding driving methods of the first power supply terminal VLED and the second power supply terminal SRC are different. In this way, the driving methods of the backlight module are diversified, which is beneficial to enabling the backlight module to meet various application scenarios and improve the performance of the backlight module.

[0152] In some embodiments, within one frame time, the duration of the effective voltage output by the first power supply terminal is greater than the duration of the effective voltage output by the second power supply terminal; the method provided by the embodiments of the present application further includes:

[0153] When the picture to be displayed needs to increase the brightness, when displaying the picture to be displayed, the backlight module is switched to the first working condition.

[0154] Exemplarily, the backlight module is arranged in the in-vehicle instrument display device. When the backlight module starts to work, it defaults to the second working condition. When the VCU host sends a trigger signal or the timing chip Tcon IC recognizes that the display picture needs to increase the brightness, the backlight module is switched from the second working condition to the first working condition.

[0155] Exemplarily, the alarm light / Icon icon picture displayed in the area where the light-emitting element with increased brightness is located can increase the brightness of the alarm light / Icon icon picture to improve driving safety.

[0156] The method provided by the embodiments of the present application further includes: when the picture to be displayed does not need to increase the brightness, when displaying the picture to be displayed, keep the backlight module working in the second working condition.

[0157] The present application also provides a display device, including the display panel provided by the present application. Please refer to Figure 16 , Figure 16 is a schematic structural diagram of a display device provided by the embodiments of the present application. Figure 16 The provided display device 1000 includes the display panel 100 provided by any of the above embodiments of the present application. Figure 16Taking the in-vehicle display device as an example only, the display device 1000 will be described. It can be understood that the display device provided in the embodiments of the present application can be other display devices with a display function, such as wearable products, computers, TVs, mobile phones, etc. The present application does not make specific limitations thereto. The display device provided in the embodiments of the present application has the beneficial effects of the display panel provided in the embodiments of the present application. For specific descriptions of the display panel, reference can be made to the above embodiments. Details will not be repeated herein.

[0158] As can be seen from the above embodiments, the backlight module, its driving method, and the display device provided by the present invention at least achieve the following beneficial effects:

[0159] The backlight module provided by the present invention includes: a backlight source including a light-emitting element; a driving chip including a first power supply terminal, a second power supply terminal, and a third power supply terminal, where the signal timings output by the first power supply terminal and the second power supply terminal are different; a gating circuit connecting the first pole of the light-emitting element, the first power supply terminal, and the second power supply terminal, and the second pole of the light-emitting element is connected to the third power supply terminal. The gating circuit is configured to: connect or disconnect the first power supply terminal from the first pole of the light-emitting element, or connect or disconnect the second power supply terminal from the first pole of the light-emitting element. According to the backlight module, its driving method, and the display device provided in the embodiments of the present application, the backlight module provided by the present invention drives the light-emitting element to emit light by the signal output by the first power supply terminal when the gating circuit connects the first power supply terminal to the first pole of the light-emitting element. When the gating circuit connects the second power supply terminal to the first pole of the light-emitting element, the light-emitting element is driven to emit light by the signal output by the second power supply terminal. The signal timings output by the first power supply terminal and the second power supply terminal are different, and the corresponding driving modes of the first power supply terminal and the second power supply terminal are different. In this way, the driving mode of the backlight module is diversified, which is beneficial to enabling the backlight module to meet various application scenarios and improve the performance of the backlight module.

[0160] In accordance with the embodiments of the present application as described above, these embodiments do not describe all details in detail, nor do they limit the application to only the specific embodiments described. Obviously, many modifications and variations can be made based on the above description. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present application, so that those skilled in the art can make good use of the present application and its modifications. The present application is only limited by the claims and their full scope and equivalents.

Claims

1. A backlight module, characterized in that: include: A backlight source, including a light emitting element; A driving chip, comprising a first power supply terminal, a second power supply terminal and a third power supply terminal, wherein the first power supply terminal and the second power supply terminal output signals of different timings; A gating circuit is configured to connect the first pole of the light-emitting element, the first power supply terminal and the second power supply terminal, and the second pole of the light-emitting element is connected to the third power supply terminal. The gating circuit is configured to connect or disconnect the first power supply terminal with the first pole of the light-emitting element, or connect or disconnect the second power supply terminal with the first pole of the light-emitting element.

2. The backlight module according to claim 1, characterized in that: In one frame time, the first power supply end and the second power supply end output effective voltages of different durations.

3. The backlight module according to claim 1, characterized in that: The n light-emitting elements form a light-emitting element group, n is an integer greater than 1, and the n second power terminals form a power terminal group; The gating circuit is configured to: connect or disconnect the first power supply terminal with the first poles of the n light-emitting elements in the light-emitting element group, or connect or disconnect the n second power supply terminals in the power supply terminal group with the first poles of the n light-emitting elements in the light-emitting element group in a one-to-one correspondence; The n second power supply terminals in the power supply terminal group are used for outputting effective voltages in a time-sharing manner within a frame time.

4. The backlight module according to claim 3, characterized in that: In one frame time, the duration during which the first power supply terminal outputs a valid voltage is longer than the duration during which any one of the second power supply terminals in the power supply terminal group outputs a valid voltage.

5. The backlight module according to claim 3, characterized in that: In one frame time, the duration during which the first power supply terminal outputs a valid voltage is equal to the sum of the durations during which the n second power supply terminals of the power supply terminal group output valid voltages.

6. The backlight module according to claim 1, characterized in that: The gating circuit includes a multiplexer, a first input terminal of the multiplexer is connected to the first power terminal, a second input terminal of the multiplexer is connected to the second power terminal, and an output terminal of the multiplexer is connected to the first electrode of the light-emitting element.

7. The backlight module according to claim 6, characterized in that: The n light-emitting elements form a light-emitting element group, n is an integer greater than 1, and the n second power terminals form a power terminal group; The gating circuit includes n multiplexers, the first input terminals of the n multiplexers are connected to the first power supply terminal, the second input terminals of the n multiplexers are connected one-to-one with the n second power supply terminals in the power supply terminal group, and the output terminals of the n multiplexers are connected one-to-one with the first poles of the n light-emitting elements in the light-emitting element group.

8. The backlight module according to claim 7, characterized in that: The control ends of the n multiplexers are electrically connected to each other.

9. The backlight module according to claim 7, characterized in that: The control ends of at least two multiplexers among the n multiplexers are independent of each other.

10. The backlight module according to claim 1, characterized in that: The gating circuit includes a first switch and a second switch; The first end of the first switch is connected to the first power supply end, the second end of the first switch is connected to the first electrode of the light emitting element, the first end of the second switch is connected to the second power supply end, and the second end of the second switch is connected to the first electrode of the light emitting element; The control end of the first switch and the control end of the second switch are independent of each other.

11. The backlight module according to claim 10, characterized in that: The n light-emitting elements form a light-emitting element group, n is an integer greater than 1, and the n second power terminals form a power terminal group; The gating circuit includes n first switches and n second switches; The first ends of the n first switches are all connected to the first power supply end, and the second ends of the n first switches are connected to the first electrodes of the n light-emitting elements in the light-emitting element group in a one-to-one correspondence; The first ends of the n second switches are connected one-to-one with the n second power supply ends in the power supply end group, and the second ends of the n second switches are connected one-to-one with the first poles of the n light-emitting elements in the light-emitting element group.

12. The backlight module according to claim 11, characterized in that: Control ends of the n first switches are electrically connected to each other, and control ends of the n second switches are electrically connected to each other; Alternatively, control ends of at least two of the n first switches are independent of each other, and control ends of at least two of the n second switches are independent of each other.

13. The backlight module according to claim 1, characterized in that: The gating circuit is located in the backlight source, or the gating circuit is located inside the driving chip, or the gating circuit is located on a printed circuit board.

14. The backlight module according to claim 3, characterized in that: The backlight source includes a plurality of light emitting element groups, and one power supply terminal group is electrically connected to at least two of the light emitting element groups through the gating circuit.

15. The backlight module according to claim 3, characterized in that: The third power supply terminal is connected to the second electrodes of the plurality of light emitting elements in the light emitting element group.

16. The backlight module according to claim 3, characterized in that: The backlight source includes m light emitting element groups, the driving chip includes m third power terminals, m is an integer greater than 1, and the m third power terminals and the m light emitting element groups are connected in a one-to-one correspondence.

17. The backlight module according to claim 16, characterized in that: The i-th light emitting element group is connected to the i-th third power supply terminal, and the j-th light emitting element group is connected to the j-th third power supply terminal, i≠j, i and j are any two values ​​from 1 to m; In the first working condition, the gating circuit is configured to: connect the i-th light emitting element group and the j-th light emitting element group to the first power supply terminal; And under the first working condition, the i-th third power supply terminal outputs power, and the j-th third power supply terminal is in a suspended state.

18. A method for driving a backlight module, characterized in that: Used to drive the backlight module according to any one of claims 1 to 17; The method comprises: In a first working condition, controlling the gating circuit to connect the first power supply terminal to the first electrode of the light-emitting element; In the second working condition, the gating circuit is controlled to connect the second power supply terminal to the first pole of the light-emitting element.

19. The method according to claim 18, characterized in that: In one frame time, the duration of the effective voltage output by the first power supply terminal is longer than the duration of the effective voltage output by the second power supply terminal; In the case where the brightness of the picture to be displayed needs to be increased, the backlight module is switched to the first working state when displaying the picture to be displayed.

20. A display device, characterized in that: It comprises the backlight module as described in any one of claims 1-17.

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