CN115376472A - Backlight module, display module and electronic equipment - Google Patents
Backlight module, display module and electronic equipment Download PDFInfo
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- CN115376472A CN115376472A CN202211198723.8A CN202211198723A CN115376472A CN 115376472 A CN115376472 A CN 115376472A CN 202211198723 A CN202211198723 A CN 202211198723A CN 115376472 A CN115376472 A CN 115376472A
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- 238000005192 partition Methods 0.000 claims abstract description 63
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000000295 complement effect Effects 0.000 claims description 5
- 230000005684 electric field Effects 0.000 claims description 4
- 238000002834 transmittance Methods 0.000 claims description 4
- 238000000638 solvent extraction Methods 0.000 abstract description 3
- 238000004020 luminiscence type Methods 0.000 abstract 3
- 238000010586 diagram Methods 0.000 description 4
- 230000005669 field effect Effects 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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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
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Abstract
The application provides a backlight module, display module and electronic equipment, backlight module includes power supply circuit, control circuit, at least one drive circuit and a plurality of luminescence unit, drive circuit includes a plurality of output ports, be used for outputting first voltage signal under control circuit's control, backlight module has the partitioning region of a plurality of interval settings, every partitioning region all includes first subregion and second subregion, power supply circuit is used for outputting second voltage signal or third voltage signal under control circuit's control, the luminescence unit of first subregion works under the loading of first voltage signal and second voltage signal, the luminescence unit of second subregion works under the loading of first voltage signal and third voltage signal. Under the control of the control circuit, the power supply circuit can selectively output a second voltage signal or a third voltage signal, so that the aim of increasing the number of the partitions of the backlight module is fulfilled.
Description
Technical Field
The application relates to the technical field of display, in particular to a backlight module, a display module and electronic equipment.
Background
Display technology has been one of the important research directions in electronic devices, and at present, a common backlight source cannot meet the requirement of high-contrast image quality display of liquid crystal. Compared with static local dimming, the dynamic scanning local dimming mode can greatly save the use number 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 backlight unit can solve the not enough technical problem of backlight unit subregion quantity.
In a first aspect, the present application provides a backlight module, the backlight module includes a power supply circuit, a control circuit, at least one driving circuit and a plurality of light emitting units, the driving circuit includes a plurality of output ports for outputting a first voltage signal under the control of the control circuit, the backlight module has a plurality of partitioned areas arranged at intervals, each partitioned area includes 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 electrically connected to the output ports, cathodes of the light emitting units arranged 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, the power supply circuit is configured to output a second voltage signal or a third voltage signal under the control of the control circuit, the light emitting units in the first partition operate under the loading of the first voltage signal and the second voltage signal, and the light emitting units in the second partition operate 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 light emitting unit can work under the loading of the first voltage signal and the second voltage signal or the loading of the first voltage signal and the third voltage signal, and the purpose of increasing the number of the partitions of the backlight module is achieved.
Optionally, the power supply circuit includes a first transistor and a second transistor, 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 mutually inverse signals, and types of the first transistor and the second transistor are complementary.
Optionally, the backlight module further comprises an inverter, and the control circuit generates the first control signal, and the first control signal is inverted by the inverter to generate the second control signal.
Optionally, the negative electrode of the light emitting unit in the first partition is electrically connected to 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 to 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 to the power supply circuit.
In a second aspect, the present application further provides a display module, the display module includes a display panel and a backlight module according to the first aspect, the display panel is used for changing the transmittance of the display panel through the light emitted by the backlight module under the 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 according to the second aspect, and the housing is used for carrying the display module.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on the drawings without any inventive exercise.
Fig. 1 is a schematic view of a backlight module frame according to an embodiment of the present disclosure.
Fig. 2 is a schematic diagram of a power supply circuit according to an embodiment of the present disclosure.
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 disclosure.
Fig. 5 is a schematic 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.
The reference numbers indicate: the display device comprises a backlight module-1, a power supply circuit-11, a first transistor-111, a second transistor-112, a grid-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, an anode-141, a cathode-142, a block area-15, a first partition-151, a second partition-152, an inverter-16, a scanning circuit-17, a filter capacitor-18, a display module-2, a display panel-21, electronic equipment-3 and a shell-31.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
Fig. 1 is a schematic view of a backlight module 1 according to an embodiment of the present disclosure. 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, wherein 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 arranged 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 arranged 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 arranged in the second partition 152 are connected in parallel and electrically connected to the same output port 131, and 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 port 131, the power supply circuit 11 is configured to output a second voltage signal or a third voltage signal under the control of the control circuit 12, the light emitting units 14 in the first partition 151 load the working voltage signal of the second voltage signal and the working voltage signal of the light emitting units 14 under the loading of the working voltage of the first partition 152.
In a display panel in which pixels cannot emit light autonomously, for example, a liquid crystal display panel, a backlight is required to be provided to realize a display function of the display panel. The backlight module 1 can be used as a backlight source of a liquid crystal display panel, adopts Mini LEDs with small packaging sizes, and can realize independent dimming of tens of thousands of partitions.
Specifically, the partitioning of the backlight module 1 is to perform partition control on the light emitting units 14 through the constant current driving circuit 13, so as to respectively light the light emitting units 14 in different partitions, and implement partition-type dimming of the backlight module 1, thereby improving dimming capability and life of the backlight module 1, and being capable of reducing power consumption of the backlight module 1, and improving picture contrast and display quality. In general, the light emitting units 14 are arranged in an array, and the light emitting units 14 are cyclically illuminated row by row and column by column to dynamically adjust the light emitting units 14, while the number of partitions of the backlight module 1 is fixed.
It can be understood 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 the driving circuits 13 is multiple, the plurality of driving circuits 13 respectively drive the corresponding light emitting units 14, and different driving circuits 13 are further electrically connected through data lines to transmit the control signal generated by the control circuit 12.
In this embodiment, the output ports 131 of the driving circuit 13 correspond to the light emitting units 14 in a row, 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 can selectively output 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 understood that, on the basis of the second partition 152, the first partition 151 is added, so as to increase the number of partitions of the backlight module 1.
It can be understood that, in the present 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.
It is understood that, in other possible embodiments, 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, and 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; 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 as long as the power supply circuit 11 can control 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, without being affected, and the number and the positions where the first partitions 151 are disposed are not limited in the present application.
In one possible implementation, please refer to fig. 2, and fig. 2 is a schematic diagram of a power supply circuit according to an embodiment of the present disclosure. 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 positive electrode 141 or the negative electrode 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.
It is understood that 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 preventing the power supply circuit 11 from simultaneously outputting the second voltage signal and the third voltage signal.
In this embodiment, the first electrode s is a source, and the second electrode d is a drain, and it can be understood that, in other possible embodiments, the first electrode s and the second electrode d of the first transistor 111 can be interchanged, and similarly, the first electrode s and the second electrode d of the second transistor 112 can be interchanged, which is not limited in this application. The present application also does not limit the circuit design of the power supply circuit 11 as long as the selective output of the second voltage signal or the third voltage signal by the power supply circuit 11 is not affected.
In one possible implementation, referring to fig. 2 again, the control circuit 12 generates the first control signal and the second control signal, the first control signal and the second control signal are mutually inverse signals, and the types of the first transistor 111 and the second transistor 112 are complementary.
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 inverse 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 types of the first transistor 111 and the second transistor 112 are complementary, for example, when the first transistor 111 is a P-type field effect transistor, the second transistor 112 is an N-type field effect transistor, and vice versa, when the first transistor 111 is an N-type field effect transistor, the second transistor 112 is a P-type field effect transistor, which is not limited in this application.
It can be understood that the types of the first transistor 111 and the second transistor 112 are complementary, 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, which can realize that the first transistor 111 and the second transistor 112 are not turned on at the same time, thereby preventing the power supply circuit 11 from outputting the second voltage signal and the third voltage signal at the same time.
In one possible implementation, please refer to fig. 3, and fig. 3 is a schematic diagram of a power supply circuit according to another implementation of the present application. The backlight module 1 further comprises an inverter 16, and the control circuit 12 generates the first control signal and is inverted by the inverter 16 to generate the second control signal.
It can be understood that the present embodiment is different from the previous embodiment in that the control circuit 12 only needs to generate the first control signal, and compared to the previous embodiment, the control circuit 12 only needs to generate the first control signal and the second control signal, in the present embodiment, the first control signal generated by the control circuit 12 only needs to be inverted by the inverter 16 to obtain the second control signal. Therefore, the requirement on the control circuit 12 is lower, so that the control circuit 12 with lower cost can be adopted, the requirement on the control circuit 12 is reduced, and the cost is saved.
In one possible embodiment, referring to fig. 1 again, the cathode 142 of the light emitting unit 14 in the first partition 151 is electrically connected to the anode 141 of the light emitting unit 14 in the adjacent 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 to the same output port 131 in parallel, and the electrodes of the light emitting units 14 in the adjacent first and second partitions 151 and 152 that are electrically connected to the output port 131 are different, in order to respectively light the light emitting units 14 in the adjacent first and second partitions 151 and 152, 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 partition 152, in other words, the light emitting units 14 in the adjacent first and second partitions 151 and 152 are arranged in a mirror image.
It is understood 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, and 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, respectively, the anode 141 of the light emitting unit 14 in the first partition 151 is electrically connected to the cathode 142 of the light emitting unit 14 in the adjacent second partition 152. The present application is not limited thereto as long as the lighting of the light emitting units 14 adjacent to the first partition 151 and the second partition 152, respectively, is not affected.
In a possible embodiment, 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.
Specifically, for example, if 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 units 14 of the first sub-area 151 are turned on under the loading of the first voltage signal and the second voltage signal, and the light emitting units 14 of the second sub-area 152 have no current flowing through them, then the light emitting units 14 of the second sub-area 152 are not turned on; similarly, when the power supply circuit 11 outputs the third voltage signal, the light emitting units 14 of the second sub-area 152 are turned on under the loading of the first voltage signal and the third voltage signal, and no current flows through the light emitting units 14 of the first sub-area 151, then the light emitting units 14 of the first sub-area 151 are not turned on, so as to control the light emitting units 14 of the first sub-area 151 and the second sub-area 152 respectively.
It is understood that, in other possible embodiments, the voltage values of the first voltage signal, the second voltage signal and the third voltage signal may also be other values as long as the lighting of the light emitting units 14 of the first partition 151 or the second partition 152 under the loading of the first voltage signal and the second voltage signal or the loading of the first voltage signal and the third voltage signal 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 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 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 form, 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 implemented, in other words, the light emitting units 14 can be lit up row by row and column by column.
In this embodiment, the scan circuit 17 includes at least one transistor, each transistor is electrically connected to the control circuit 12 and is turned on one by one under the control of the control signal generated by the control circuit 12. For example, as shown in fig. 1, when the scan circuit 17 in the first row is turned on under the control of the control circuit 12, and the driving circuit 13 is under the control of the control circuit 12, the output port 131 in the first column outputs the first voltage signal, and 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 in the first column and the first sub-area 151 are turned on. By analogy, independent control of all the light emitting units 14 in the backlight module 1 can be realized.
It can be understood that, in the present embodiment, by turning on the scanning circuits 17 respectively, the power consumption of the backlight module 1 can be reduced, and the lifetime, the image contrast and the display quality of the backlight module 1 can be improved.
In a possible implementation manner, referring to fig. 1 again, the backlight module 1 further includes a filter capacitor 18, 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 understood that, in this embodiment, the filter capacitor 18 plays a role of filtering the second voltage signal or the third voltage signal, so that the output of the second voltage signal or the third voltage signal can be relatively smooth, and the interference of the second voltage signal and the third voltage signal to the circuit is reduced.
Fig. 4 and 5 are also provided, and fig. 4 is a schematic top view of a display module 2 according to an embodiment of the present disclosure; fig. 5 is a schematic 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, the display panel 21 is configured to change the transmittance of the light emitted from the backlight module 1 through the display panel 21 under the control of an electric field. Specifically, please refer to the above description for the backlight module 1, which is not described herein again.
Specifically, the display panel 21 further includes a color filter, and the display function of the display module 2 can be realized by controlling an electric field in a pixel defining area of the display panel 21, changing light transmittance of each different pixel defining 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 number of partitions of the backlight module 1, and thus improving the display quality of the display module 2.
Fig. 6 is a schematic top view of an electronic device 3 according to an embodiment of the present disclosure, and fig. 6 is a schematic top view of the electronic device. The electronic device 3 includes a housing 31 and the display module 2 as described above, and the housing 31 is used for carrying the display module 2. Specifically, please refer to the above description for the display module 2, which is not repeated 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 device such as a mobile phone, a smart phone, a tablet computer, an electronic reader, a portable device when worn, a notebook computer, and 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) server, and 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 thus improving the display quality of the electronic device 3.
The principle and the embodiment of the present application are explained by applying a specific example, and the above description of the embodiment is only used to help understand the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A backlight module is characterized in that 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 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, cathodes or anodes of the light emitting units in the first partition and 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 loading of the first voltage signal and the second voltage signal, and the light emitting units in the second partition work under the loading of the first voltage signal and the third voltage signal.
2. The backlight module according to claim 1, wherein the power supply circuit comprises a first transistor and a second transistor, a 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, a first electrode of the first transistor is used for receiving 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.
3. The backlight module as claimed in 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 inverse signals, and the first transistor and the second transistor are complementary in type.
4. The backlight module as claimed in claim 2, wherein the backlight module further comprises an inverter, and the control circuit generates the first control signal and is inverted by the inverter to generate the second control signal.
5. The backlight module according to claim 1, wherein the cathodes of the light emitting cells in the first segment are electrically connected to the anodes of the light emitting cells in the adjacent second segment.
6. The backlight module as claimed in claim 1, wherein the third voltage signal is greater than the voltage value of the first voltage signal, and the first voltage signal is greater than the voltage value of the second voltage signal.
7. The backlight module as claimed in claim 1, wherein the backlight module further comprises a scan circuit, and the scan circuits respectively transmit the second voltage signal or the third voltage signal to the light emitting units electrically connected to the scan circuit under the control of the control circuit.
8. The backlight module as claimed in claim 1, wherein the backlight module further comprises a filter capacitor, one end of the filter capacitor is grounded, and the other end of the filter capacitor is electrically connected to the power supply circuit.
9. A display module, comprising a display panel and the backlight module according to any one of claims 1 to 8, wherein the display panel is configured to change the transmittance of the light emitted from the backlight module through the display panel under the control of an electric field.
10. An electronic device, wherein the electronic device comprises a housing and the display module as claimed in claim 9, and the housing is used for carrying the display module.
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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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| 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 true CN115376472A (en) | 2022-11-22 |
| CN115376472B CN115376472B (en) | 2023-09-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115938320A (en) * | 2023-01-29 | 2023-04-07 | 厦门天马微电子有限公司 | Backlight module and display device |
Citations (10)
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| CN115376472B (en) | 2023-09-19 |
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