CN115376472B - Backlight module, display module and electronic equipment - Google Patents
Backlight module, display module and electronic equipment Download PDFInfo
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- CN115376472B CN115376472B CN202211198723.8A CN202211198723A CN115376472B CN 115376472 B CN115376472 B CN 115376472B CN 202211198723 A CN202211198723 A CN 202211198723A CN 115376472 B CN115376472 B CN 115376472B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
Abstract
The application provides a backlight module, a display module and electronic equipment, wherein the backlight module comprises a power supply circuit, a control circuit, at least one driving circuit and a plurality of light emitting units, the driving circuit comprises a plurality of output ports and is used for outputting a first voltage signal under the control of the control circuit, the backlight module is provided with a plurality of partitioned areas which are arranged at intervals, each partitioned area comprises a first partition and a second partition, the power supply circuit is used for outputting a second voltage signal or a third voltage signal under the control of the control circuit, the light emitting units of the first partition work under the loading of the first voltage signal and the second voltage signal, and the light emitting units of the second partition work under the loading of the first voltage signal and the third voltage signal. Under the control of the control circuit, the power supply circuit can selectively output the second voltage signal or the third voltage signal, so that the aim of increasing the partition number of the backlight module is fulfilled.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a backlight module, a display module, and an electronic device.
Background
The display technology is one of important research directions in electronic equipment, the conventional backlight source cannot meet the requirement of high-contrast image quality display of liquid crystal at present, and the conventional LED is used as the backlight source and controlled by adopting a static area dimming mode, so that the partition number of the backlight source is small. Compared with static area dimming, the dynamic scanning area dimming mode can greatly save the use quantity of constant current driving chips and reduce the cost. However, it is still important to further increase the number of partitions of the backlight.
Disclosure of Invention
The application discloses a backlight module which can solve the technical problem of insufficient partition quantity of the backlight module.
In a first aspect, the present application provides a backlight module, where the backlight module includes a power supply circuit, a control circuit, at least one driving circuit, and a plurality of light emitting units, where the driving circuit includes a plurality of output ports for outputting a first voltage signal under control of the control circuit, where the backlight module includes a plurality of block areas disposed at intervals, each block area includes a first partition and a second partition, in the same block area, anodes of the light emitting units disposed in the first partition are connected in parallel and electrically connected to the output ports, cathodes of the light emitting units disposed in the second partition are connected in parallel and electrically connected to the same output port, and cathodes or anodes of the light emitting units in the first partition and the second partition are electrically connected to the same output port, where the power supply circuit is configured to output a second voltage signal or a third voltage signal under control of the control circuit, where the light emitting units of the first partition work under the first voltage signal and the second voltage signal, and where the light emitting units of the first partition work under the loading of the first voltage signal and the second voltage signal.
Under the control of the control circuit, the power supply circuit can selectively output the second voltage signal or the third voltage signal, so that the light-emitting unit can work under the loading of the first voltage signal and the second voltage signal or under the loading of the first voltage signal and the third voltage signal, and the aim of increasing the partition number of the backlight module is fulfilled.
Optionally, the power supply circuit includes a first transistor and a second transistor, where a gate of the first transistor is configured to receive a first control signal, the first control signal is configured to control on-off of the first transistor, a first electrode of the first transistor is configured to receive the third voltage signal, and a second electrode of the first transistor is electrically connected to an anode or a cathode of the light emitting unit; the grid electrode of the second transistor is used for receiving a second control signal, the first electrode of the second transistor is used for receiving the second voltage signal, the second control signal is used for controlling the on-off of the second transistor, and the second electrode of the second transistor is electrically connected to the positive electrode or the negative electrode of the light emitting unit.
Optionally, the control circuit generates the first control signal and the second control signal, the first control signal and the second control signal are opposite signals, and the first transistor and the second transistor are the same type.
Optionally, the backlight module further includes an inverter, and the control circuit generates the first control signal and inverts the first control signal through the inverter to generate the second control signal.
Optionally, the negative electrode of the light emitting unit in the first partition is electrically connected with the positive electrode of the light emitting unit in the adjacent second partition.
Optionally, the third voltage signal is greater than a voltage value of the first voltage signal, and the first voltage signal is greater than a voltage value of the second voltage signal.
Optionally, the backlight module further includes a scanning circuit, and the plurality of scanning circuits respectively transmit the second voltage signal or the third voltage signal to the light emitting unit electrically connected with the scanning circuit under the control of the control circuit.
Optionally, the backlight module further includes a filter capacitor, one end of the filter capacitor is grounded, and the other end of the filter capacitor is electrically connected with the power supply circuit.
In a second aspect, the present application further provides a display module, where the display module includes a display panel and the backlight module according to the first aspect, and the display panel is configured to change transmittance of light emitted by the backlight module through the display panel under control of an electric field.
In a third aspect, the present application further provides an electronic device, where the electronic device includes a housing and the display module set according to the second aspect, and the housing is used to carry the display module set.
Drawings
For a clearer description of the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a backlight module frame according to an embodiment of the application.
Fig. 2 is a schematic diagram of a power supply circuit according to an embodiment of the application.
Fig. 3 is a schematic diagram of a power supply circuit according to another embodiment of the present application.
Fig. 4 is a schematic top view of a display module according to an embodiment of the application.
Fig. 5 is a schematic cross-sectional view taken along line I-I in fig. 4.
Fig. 6 is a schematic top view of an electronic device according to an embodiment of the application.
Reference numerals illustrate: the backlight module comprises a backlight module body-1, a power supply circuit-11, a first transistor-111, a second transistor-112, a grid electrode-g, a first electrode-s, a second electrode-d, a control circuit-12, a driving circuit-13, an output port-131, a light emitting unit-14, a positive electrode-141, a negative electrode-142, a blocking area-15, a first partition-151, a second partition-152, an inverter-16, a scanning circuit-17, a filter capacitor-18, a display module body-2, a display panel-21, an electronic device-3 and a shell-31.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to fall within the scope of the present application.
Referring to fig. 1, fig. 1 is a schematic diagram of a backlight module frame according to an embodiment of the application. The backlight module 1 includes a power supply circuit 11, a control circuit 12, at least one driving circuit 13 and a plurality of light emitting units 14, the driving circuit 13 includes a plurality of output ports 131 for outputting a first voltage signal under the control of the control circuit 12, the backlight module 1 has a plurality of partitioned areas 15 disposed at intervals, each partitioned area 15 includes a first partition 151 and a second partition 152, in the same partitioned area 15, anodes 141 of the light emitting units 14 disposed in the first partition 151 are connected in parallel and electrically connected to the output ports 131, cathodes 142 of the light emitting units 14 disposed in the second partition 152 are connected in parallel and electrically connected to the same output ports 131, cathodes 142 or anodes 141 of the light emitting units 14 in the first partition 151 and the second partition 152 are electrically connected to the same output ports 131, the power supply circuit 11 is used for outputting a second voltage signal or a third voltage signal under the control of the control circuit 12, and the first light emitting units 14 are loaded with the second voltage signal and the third voltage signal under the loading of the first partition 151 and the second voltage signal under the loading of the second partition 14.
It should be noted that, for a display panel in which a pixel cannot emit light autonomously, for example, a liquid crystal display panel, a backlight source needs to be provided to realize a display function of the display panel. The backlight module 1 provided by the application can be used as a backlight source of a liquid crystal display panel, and can realize independent dimming with tens of thousands of partitions by adopting Mini LEDs with smaller packaging size.
Specifically, the partitioning of the backlight module 1 means that the driving circuit 13 with constant current performs the area-division control on the light emitting units 14, so as to light up the light emitting units 14 in different areas respectively, and realize the area-division dimming of the backlight module 1, thereby improving the dimming capability and the service life of the backlight module 1, reducing the power consumption of the backlight module 1, and improving the picture contrast and the display quality. In general, the light emitting units 14 are arranged in an array, and the light emitting units 14 are turned on by a row-by-row cycle, so as to dynamically adjust the light emitting units 14, and the number of the partitions of the backlight module 1 is fixed.
It will be appreciated that, since the number of the output ports 131 of a single driving circuit 13 is generally limited, a plurality of driving circuits 13 may be used to drive a plurality of light emitting units 14, for example, as shown in fig. 1, when the number of driving circuits 13 is plural, a plurality of driving circuits 13 respectively drive the corresponding light emitting units 14, and different driving circuits 13 are electrically connected through data lines to transmit the control signal generated by the control circuit 12.
In the present embodiment, the plurality of output ports 131 of the driving circuit 13 correspond to one row of the light emitting units 14, and the driving circuit 13 outputs the first voltage signal to the corresponding output port 131 under the control of the control circuit 12. The power supply circuit 11 is capable of selectively outputting the second voltage signal or the third voltage signal to the light emitting unit 14 under the control of the control circuit 12. It can be appreciated that the number of the partitions of the backlight module 1 is increased by adding the first partition 151 to the original second partition 152.
It can be understood that, in this embodiment, under the control of the control circuit 12, the power supply circuit 11 can selectively output the second voltage signal or the third voltage signal, so that the light emitting unit 14 can operate under the loading of the first voltage signal and the second voltage signal, or operate under the loading of the first voltage signal and the third voltage signal, thereby achieving the purpose of increasing the partition number of the backlight module 1.
It can be appreciated that, in other possible embodiments, the cathodes 142 of the light emitting units 14 disposed in the same first partition 151 may be connected in parallel and electrically connected to the output port 131, and the anodes 141 of the light emitting units 14 disposed in the same second partition 152 may be connected in parallel and electrically connected to the output port 131; the number of the first partitions 151 may be equal to or smaller than the number of the second partitions 152, and the positions where the first partitions 151 are disposed may be arbitrary, so long as the power supply circuit 11 is not affected to be capable of controlling the light emitting units 14 of the first partitions 151 and the second partitions 152 according to the second voltage signal or the third voltage signal, respectively, and the present application does not limit the number and the positions where the first partitions 151 are disposed.
In one possible embodiment, please refer to fig. 2, fig. 2 is a schematic diagram of a power supply circuit according to an embodiment of the present application. The power supply circuit 11 includes a first transistor 111 and a second transistor 112, a gate g of the first transistor 111 is configured to receive a first control signal, the first control signal is configured to control on-off of the first transistor 111, a first electrode s of the first transistor 111 is configured to receive the third voltage signal, and a second electrode d of the first transistor 111 is electrically connected to an anode 141 or a cathode 142 of the light emitting unit 14; the gate g of the second transistor 112 is configured to receive a second control signal, the first electrode s of the second transistor 112 is configured to receive the second voltage signal, the second control signal is configured to control on-off of the second transistor 112, and the second electrode d of the second transistor 112 is electrically connected to the anode 141 or the cathode 142 of the light emitting unit 14.
Specifically, the first transistor 111 and the second transistor 112 are controlled to be turned on by the first control signal and the second control signal, respectively, so that the power supply circuit 11 can selectively output the second voltage signal or the third voltage signal. In this embodiment, as shown in fig. 2, the second voltage signal is a ground signal.
As can be appreciated, when the first transistor 111 is turned on under the control of the first control signal, the second transistor 112 is turned off under the control of the second control signal; vice versa, when the first transistor 111 is turned off under the control of the first control signal, the second transistor 112 is turned on under the control of the second control signal, thereby avoiding that the power supply circuit 11 outputs the second voltage signal and the third voltage signal at the same time.
In this embodiment, the first electrode s is a source electrode, and the second electrode d is a drain electrode, and it is understood that in other possible embodiments, the first electrode s and the second electrode d of the first transistor 111 may be interchanged, and similarly, the first electrode s and the second electrode d of the second transistor 112 may be interchanged, which is not limited in the present application. The present application also does not limit the circuit design of the power supply circuit 11 as long as the power supply circuit 11 selectively outputs the second voltage signal or the third voltage signal.
In a possible implementation, referring again to fig. 2, the control circuit 12 generates the first control signal and the second control signal, the first control signal and the second control signal are opposite signals, and the first transistor 111 and the second transistor 112 are of the same type.
Specifically, in order to realize that the first transistor 111 and the second transistor 112 are not turned on at the same time, the first control signal and the second control signal are mutually inverted signals, for example, when the first control signal is a high level signal, the second control signal is a low level signal, and vice versa, when the first control signal is a low level signal, the second control signal is a high level signal; meanwhile, the first transistor 111 and the second transistor 112 are of the same type, for example, when the first transistor 111 is a P-type field effect transistor, the second transistor 112 is also a P-type field effect transistor, and vice versa, and when the first transistor 111 is an N-type field effect transistor, the second transistor 112 is also an N-type field effect transistor, which is not limited by the present application.
It is understood that the first transistor 111 and the second transistor 112 are of the same type, so that the first transistor 111 and the second transistor 112 are turned on according to a high level signal or a low level signal, respectively, and therefore, in this embodiment, the first control signal and the second control signal are opposite signals to each other, it may be achieved that the first transistor 111 and the second transistor 112 are not turned on at the same time, so that the power supply circuit 11 is prevented from outputting the second voltage signal and the third voltage signal at the same time.
In one possible embodiment, please refer to fig. 3, fig. 3 is a schematic diagram of a power supply circuit according to another embodiment of the present application. The backlight module 1 further includes an inverter 16, and the control circuit 12 generates the first control signal, and the first control signal is inverted by the inverter 16 to generate the second control signal.
It should be understood that the difference between the present embodiment and the previous embodiment is that the control circuit 12 only needs to generate the first control signal, and in contrast to the previous embodiment, the control circuit 12 needs to generate the first control signal and the second control signal, and in the present embodiment, only the first control signal generated by the control circuit 12 needs to be inverted by the inverter 16 to obtain the second control signal. Therefore, the requirements for the control circuit 12 are lower, so that the control circuit 12 with lower cost can be adopted, the requirements for the control circuit 12 are reduced, and the cost is saved.
In a possible embodiment, referring again to fig. 1, the negative electrode 142 of the light emitting unit 14 in the first partition 151 is electrically connected to the positive electrode 141 of the light emitting unit 14 in the second partition 152.
Specifically, since the positive electrodes 141 or the negative electrodes 142 of the light emitting units 14 in the adjacent first and second partitions 151 and 152 are electrically connected in parallel to the same output port 131, and the electrodes of the light emitting units 14 in the adjacent first and second partitions 151 and 152 are electrically connected to the output port 131 are different, in order to realize lighting of the light emitting units 14 in the adjacent first and second partitions 151 and 152, respectively, the negative electrodes 142 of the light emitting units 14 in the first partition 151 are electrically connected to the positive electrodes 141 of the light emitting units 14 in the adjacent second partitions 152, in other words, the light emitting units 14 in the adjacent first and second partitions 151 and 152 are mirror images.
It will be appreciated that in other possible embodiments, when the cathodes 142 of the light emitting units 14 disposed in the same first partition 151 are connected in parallel and electrically connected to the output port 131, the anodes 141 of the light emitting units 14 disposed in the same second partition 152 are connected in parallel and electrically connected to the output port 131, and accordingly, the anodes 141 of the light emitting units 14 in the first partition 151 are electrically connected to the cathodes 142 of the light emitting units 14 in the adjacent second partition 152. The present application is not limited in this regard as long as the lighting units 14 in the adjacent first and second partitions 151 and 152 are not affected to be lighted respectively.
In one possible embodiment, the third voltage signal is greater than a voltage value of the first voltage signal, which is greater than a voltage value of the second voltage signal.
Specifically, for example, the voltage value of the first voltage signal is half of the power supply voltage, the voltage value of the second voltage signal is 0V, and the voltage value of the third voltage signal is the power supply voltage, then, as shown in fig. 1, when the power supply circuit 11 outputs the second voltage signal, the light emitting unit 14 of the first partition 151 is turned on under the loading of the first voltage signal and the second voltage signal, and the light emitting unit 14 of the second partition 152 has no current flowing, and the light emitting unit 14 of the second partition 152 is turned off; similarly, when the power supply circuit 11 outputs the third voltage signal, the light emitting unit 14 of the second partition 152 is turned on under the loading of the first voltage signal and the third voltage signal, and the light emitting unit 14 of the first partition 151 does not flow a current, the light emitting unit 14 of the first partition 151 is not turned on, thereby realizing control of the light emitting units 14 of the first partition 151 and the second partition 152, respectively.
It will be appreciated that in other possible embodiments, the voltage values of the first voltage signal, the second voltage signal and the third voltage signal may be other values, as long as the application of the first voltage signal and the second voltage signal, or the application of the first voltage signal and the third voltage signal, respectively, is not affected, and the present application is not limited thereto.
In a possible embodiment, referring to fig. 1 again, the backlight module 1 further includes a scanning circuit 17, and the plurality of scanning circuits 17 respectively transmit the second voltage signal or the third voltage signal to the light emitting unit 14 electrically connected to the scanning circuit 17 under the control of the control circuit 12.
Specifically, as shown in fig. 1, the light emitting units 14 are distributed in an array, and the plurality of scanning circuits 17 respectively transmit the second voltage signal or the third voltage signal to the light emitting units 14 electrically connected to the scanning circuits 17 under the control of the control circuit 12, so that, in cooperation with the driving circuit 13, dynamic area dimming can be achieved, in other words, row-by-row and column-by-column lighting of the light emitting units 14 can be achieved.
In this embodiment, the scanning circuit 17 includes at least one transistor, each of which is electrically connected to the control circuit 12 and is turned on one by one under the control of a control signal generated by the control circuit 12. For example, as shown in fig. 1, when the scanning circuit 17 of the first row is turned on under the control of the control circuit 12, and the driving circuit 13 outputs the first voltage signal through the output port 131 of the first column under the control of the control circuit 12, the power supply circuit 11 outputs the second voltage signal under the control of the control circuit 12, so that the light emitting units 14 of the first partition 151 of the first column are lighted. And so on, the independent control of all the light emitting units 14 in the backlight module 1 can be realized.
It can be appreciated that, in the present embodiment, by turning on the scanning circuits 17, the power consumption of the backlight module 1 can be reduced, and the lifetime, the picture contrast, and the display quality of the backlight module 1 can be improved.
In one possible embodiment, referring to fig. 1 again, the backlight module 1 further includes a filter capacitor 18, and one end of the filter capacitor 18 is grounded, and the other end is electrically connected to the power supply circuit 11.
It can be appreciated that in this embodiment, the filter capacitor 18 functions to filter the second voltage signal or the third voltage signal, so that the output of the second voltage signal or the third voltage signal is smoother, and the interference of the second voltage signal and the third voltage signal to the circuit is reduced.
The present application also provides a display module 2, please refer to fig. 4 and fig. 5 together, fig. 4 is a schematic top view of a display module according to an embodiment of the present application; fig. 5 is a schematic cross-sectional view taken along line I-I in fig. 4. The display module 2 includes a display panel 21 and the backlight module 1 as described above, where the display panel 21 is used to change the transmittance of the light emitted by the backlight module 1 through the display panel 21 under the control of an electric field. Specifically, the backlight module 1 is described above, and will not be described herein.
Specifically, the display panel 21 further includes a color filter, and the display function of the display module 2 can be realized by controlling the electric field of the pixel definition area in the display panel 21 to change the light transmittance of each different pixel definition area and combining the color filter.
It can be understood that, in this embodiment, under the control of the control circuit 12, the power supply circuit 11 can selectively output the second voltage signal or the third voltage signal, so that the light emitting unit 14 can operate under the loading of the first voltage signal and the second voltage signal, or operate under the loading of the first voltage signal and the third voltage signal, thereby achieving the purpose of increasing the partition number of the backlight module 1, and improving the display quality of the display module 2.
The application also provides an electronic device 3, please refer to fig. 6, fig. 6 is a schematic top view of the electronic device according to an embodiment of the application. The electronic device 3 includes a housing 31 and the display module 2 as described above, where the housing 31 is used to carry the display module 2. Specifically, the display module 2 is described above, and will not be described herein.
It should be noted that, in the embodiment of the present application, the electronic device 3 may be an electronic device 3 in a mobile phone, a smart phone, a tablet personal computer, an electronic reader, a portable device when worn, a notebook computer, or the like, and may communicate with a data transfer server through the internet, where the data transfer server may be an instant messaging server, an SNS (Social Networking Services, social network service) server, or the like, and the embodiment of the present application is not limited thereto.
It can be understood that, in this embodiment, under the control of the control circuit 12, the power supply circuit 11 can selectively output the second voltage signal or the third voltage signal, so that the light emitting unit 14 can operate under the loading of the first voltage signal and the second voltage signal, or operate under the loading of the first voltage signal and the third voltage signal, thereby achieving the purpose of increasing the number of partitions of the backlight module 1, and improving the display quality of the electronic device 3.
The principles and embodiments of the present application have been described herein with reference to specific examples, the description of the above embodiments being only for the purpose of aiding in the understanding of the core concept of the present application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (9)
1. The backlight module is characterized by comprising a power supply circuit, a control circuit, at least one driving circuit and a plurality of light emitting units, wherein the driving circuit comprises a plurality of output ports for outputting a first voltage signal under the control of the control circuit, the backlight module is provided with a plurality of partitioned areas which are arranged at intervals, each partitioned area comprises a first partition and a second partition, in the same partitioned area, anodes of the light emitting units arranged in the first partition are connected in parallel and are electrically connected to the output ports, cathodes of the light emitting units arranged in the second partition are connected in parallel and are electrically connected to the same output port, anodes of the light emitting units in the first partition and cathodes of the light emitting units in the second partition are electrically connected to the same output port, the power supply circuit is used for outputting a second voltage signal or a third voltage signal under the control of the control circuit, the light emitting units in the first partition work under the first voltage signal and the second voltage signal, and the second light emitting units in the first partition work under the second voltage signal and the third partition work under the loading signal; the backlight module further comprises a scanning circuit, and the scanning circuits respectively transmit the second voltage signal or the third voltage signal to the light-emitting unit electrically connected with the scanning circuit under the control of the control circuit.
2. The backlight module according to claim 1, wherein the power supply circuit comprises a first transistor and a second transistor, the gate of the first transistor is used for receiving a first control signal, the first control signal is used for controlling on-off of the first transistor, the first electrode of the first transistor is used for receiving the third voltage signal, and the second electrode of the first transistor is electrically connected to the positive electrode or the negative electrode of the light emitting unit; the grid electrode of the second transistor is used for receiving a second control signal, the first electrode of the second transistor is used for receiving the second voltage signal, the second control signal is used for controlling the on-off of the second transistor, and the second electrode of the second transistor is electrically connected to the positive electrode or the negative electrode of the light emitting unit.
3. The backlight module according to claim 2, wherein the control circuit generates the first control signal and the second control signal, the first control signal and the second control signal are opposite signals, and the first transistor and the second transistor are the same type.
4. The backlight module according to claim 2, wherein the backlight module further comprises an inverter, and the control circuit generates the first control signal and inverts the first control signal through the inverter to generate the second control signal.
5. The backlight module according to claim 1, wherein a negative electrode of the light emitting unit in the first partition is electrically connected to a positive electrode of the light emitting unit in the adjacent second partition.
6. The backlight module according to claim 1, wherein the third voltage signal is greater than a voltage value of the first voltage signal, and the first voltage signal is greater than a voltage value of the second voltage signal.
7. The backlight module according to claim 1, further comprising a filter capacitor, wherein one end of the filter capacitor is grounded, and the other end of the filter capacitor is electrically connected to the power supply circuit.
8. A display module, wherein the display module comprises a display panel and the backlight module according to any one of claims 1 to 7, the display panel is used for changing the transmittance of light rays emitted by the backlight module through the display panel under the control of an electric field.
9. An electronic device, comprising a housing and the display module of claim 8, wherein the housing is configured to carry the display module.
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| CN202211198723.8A CN115376472B (en) | 2022-09-29 | 2022-09-29 | Backlight module, display module and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211198723.8A CN115376472B (en) | 2022-09-29 | 2022-09-29 | Backlight module, display module and electronic equipment |
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| CN115376472A CN115376472A (en) | 2022-11-22 |
| CN115376472B true CN115376472B (en) | 2023-09-19 |
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