WO2021185150A1 - 显示装置及显示控制方法 - Google Patents

显示装置及显示控制方法 Download PDF

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Publication number
WO2021185150A1
WO2021185150A1 PCT/CN2021/080257 CN2021080257W WO2021185150A1 WO 2021185150 A1 WO2021185150 A1 WO 2021185150A1 CN 2021080257 W CN2021080257 W CN 2021080257W WO 2021185150 A1 WO2021185150 A1 WO 2021185150A1
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WO
WIPO (PCT)
Prior art keywords
voltage
power supply
signal
module
negative
Prior art date
Application number
PCT/CN2021/080257
Other languages
English (en)
French (fr)
Inventor
庞震华
刘广学
张玉欣
赵彩霞
徐爱臣
Original Assignee
海信视像科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN202110138504.XA external-priority patent/CN112785971B/zh
Priority claimed from CN202110177726.2A external-priority patent/CN114913817B/zh
Application filed by 海信视像科技股份有限公司 filed Critical 海信视像科技股份有限公司
Publication of WO2021185150A1 publication Critical patent/WO2021185150A1/zh
Priority to US17/660,786 priority Critical patent/US11783788B2/en
Priority to US18/460,875 priority patent/US20230419916A1/en

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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
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/01—Resonant DC/DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33571—Half-bridge at primary side of an isolation transformer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/63—Generation or supply of power specially adapted for television receivers
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/34—Voltage stabilisation; Maintaining constant voltage
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/028—Generation of voltages supplied to electrode drivers in a matrix display other than LCD
    • 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
    • G09G3/3406—Control of illumination source

Definitions

  • This application relates to the field of display technology, and in particular to a display device and a display control method.
  • the power supply circuit with stepped power supply has been disclosed in the related art.
  • the voltage stress of the voltage adjustment module provided for at least one LED light bar in the power supply circuit is relatively large, which causes the voltage adjustment module to occupy the printed circuit board where the power supply circuit is located ( Printed Circuit Board (PCB for short) has a large area, which makes the cost of the power supply circuit higher; in other possible implementations, because multiple LED drive components and connected voltage adjustment modules cannot be used in parallel, they need to be used in LLC
  • the technical problem of adding windings or diodes in the module to achieve stepped power supply results in a more complicated structure of the power supply circuit.
  • the present application provides a display device and a display control method, and the above-mentioned method solves the problem of complicated circuits in the related art display device.
  • the present application provides a display device, including: a display screen configured to display image frames; a sound reproduction device configured to play sound; at least one light-emitting diode LED light bar configured to light up the display screen; and a power supply circuit , Configured to supply power to a load of the display device, the load at least including the display screen, the sound reproduction device, and the at least one LED light bar;
  • the power supply circuit includes an LLC primary winding, a first resonant converter LLC secondary winding, and a second LLC secondary winding.
  • the first LLC secondary winding is used to convert the voltage of the LLC primary winding into a first After the voltage, output to the at least one LED light bar
  • the second LLC secondary winding is used to convert the voltage of the LLC primary winding into a second voltage, and then output to the at least one LED light bar;
  • the power supply circuit is specifically configured to adjust the first voltage output by the first LLC secondary winding to a third voltage, and use the sum of the third voltage and the second voltage to generate the at least one LED lamp Article power supply.
  • the number of LED light bars is multiple; the power supply circuit further includes: a voltage adjustment module and a voltage drive module;
  • the output end of the second LLC secondary winding is connected to the input end of the first LLC secondary winding, and the input and output ends of the first LLC secondary winding are connected to the voltage adjustment module, and the voltage adjustment module Connect the voltage drive module;
  • the first LLC secondary winding is used to output a first voltage
  • the second LLC secondary winding is used to output a second voltage
  • the voltage adjustment module is configured to adjust the first voltage to a third voltage, and send the sum of the third voltage and the second voltage to the voltage driving module;
  • the voltage driving module is used for supplying power to multiple LED light bars respectively according to the sum of the third voltage and the second voltage.
  • the voltage driving module is further configured to send a feedback signal to the voltage adjustment module according to the current of the multi-channel LED light bar; the feedback signal is used by the voltage adjustment module for the second One voltage is adjusted;
  • the voltage adjustment module is specifically configured to adjust the first voltage to the third voltage according to the feedback signal.
  • the power supply circuit further includes: an optocoupler, the optocoupler is respectively connected to the voltage driving module and the voltage adjustment module, and the optocoupler is used to connect the voltage driving module to the When the voltage adjustment module sends a feedback signal, the optocoupler is isolated.
  • the number of LED light bars is multiple; the power supply circuit further includes: a voltage adjustment module and a voltage drive module;
  • the output terminal of the first LLC secondary winding is connected to the input terminal of the second LLC secondary winding through the voltage adjustment module, and the output terminal of the second LLC secondary winding is connected to the voltage driving module;
  • the first LLC secondary winding is used to output a first voltage
  • the second LLC secondary winding is used to output a second voltage
  • the voltage adjustment module is used to adjust the first voltage to a third voltage and send the third voltage to the second LLC secondary winding, and the second LLC secondary winding is used to transfer the Sending the sum of the third voltage and the second voltage to the voltage driving module;
  • the voltage driving module is used for supplying power to multiple LED light bars respectively according to the sum of the third voltage and the second voltage.
  • the power supply circuit further includes: a voltage adjustment module; each of the at least one LED light bar is connected to a voltage adjustment module;
  • the output end of the second LLC secondary winding is connected to the input end of the first LLC secondary winding, and the output end of the first LLC secondary winding is respectively connected to each of the at least one LED light bar
  • the output end of each LED light bar is connected to the input end of a voltage adjustment module, and the output end of each voltage adjustment module is connected to the input end of the first LLC secondary winding;
  • the first LLC secondary winding is used to output a first voltage
  • the second LLC secondary winding is used to output a second voltage
  • Each of the voltage adjustment modules is used to adjust the first voltage to a third voltage, and according to the sum of the third voltage and the second voltage, supply power to the LED light bar connected to the voltage adjustment module .
  • the power supply circuit further includes: a voltage adjustment module; the at least one LED light bar is respectively connected to a second LLC secondary winding and a voltage adjustment module;
  • the output terminal of the first LLC secondary winding is connected to the output terminal of the voltage adjustment module, and the input terminal of the second LLC secondary winding is connected to the output terminal of the voltage adjustment module.
  • the input terminal of the voltage adjustment module, and the output terminal of the second LLC secondary winding is connected to the input terminal of the LED light bar;
  • the first LLC secondary winding is used to output a first voltage
  • the second LLC secondary winding is used to output a second voltage
  • Each of the voltage adjustment modules is used to adjust the first voltage to a third voltage, and according to the sum of the third voltage and the second voltage, supply power to the LED light bar connected to the voltage adjustment module .
  • the output voltage of the first LLC secondary winding is also used to supply power to the main board of the display device.
  • the first LLC secondary winding and the second LLC secondary winding are the secondary windings of the LLC module in the power supply circuit; or,
  • the first LLC secondary winding and the second LLC secondary winding are the secondary windings of the flyback voltage conversion module in the power supply circuit.
  • the present application also provides a power supply circuit.
  • the power supply circuit may be the power supply circuit in the display device according to any one of the first aspect of the present application.
  • the power supply circuit may include an LLC primary winding, a first The LLC secondary winding of the resonant converter and the second LLC secondary winding, the first LLC secondary winding is used to convert the voltage of the LLC primary winding into a first voltage, and then output to the at least one LED light bar , The second LLC secondary winding is used to convert the voltage of the LLC primary winding into a second voltage, and then output to the at least one LED light bar;
  • the power supply circuit is specifically configured to adjust the first voltage output by the first LLC secondary winding to a third voltage, and use the sum of the third voltage and the second voltage to generate the at least one LED The light bar is powered.
  • the embodiment of the present application also provides a display device, including:
  • the display screen is configured to display an image screen; a plurality of LED drive components, each LED drive component is used to supply power to the connected multi-channel light-emitting diode LED light bar, the LED light bar is configured to light up the display screen
  • a power supply circuit configured to supply power to the plurality of LED drive components; wherein the power supply circuit is specifically configured to generate a first voltage and a second voltage, and pass the first voltage and the second voltage Simultaneously supply power to the multiple LED driving components.
  • the power supply circuit is specifically configured to provide a positive first voltage to the positive electrodes of the plurality of LED driving components, and a negative second voltage to the negative electrodes of the plurality of LED driving components.
  • the power supply circuit includes an LLC primary winding configured to receive an input voltage
  • the first LLC secondary winding the positive pole of the first LLC secondary winding is connected to the positive poles of the plurality of LED drive components, and the negative pole of the first LLC secondary winding is grounded; the first LLC secondary winding is Configured to output the first voltage to the positive poles of the plurality of LED driving components after converting the input voltage into a first voltage; the negative pole of the first LLC secondary winding is grounded;
  • the second LLC secondary winding the positive pole of the second LLC secondary winding is grounded, and the negative pole of the second LLC secondary winding is connected to the negative poles of the plurality of LED driving components; the second LLC secondary winding is It is configured to output the second voltage to the anode of the plurality of LED driving components after converting the input voltage into a second voltage.
  • the power supply circuit further includes: a plurality of voltage adjustment modules; the anode of each of the first LLC secondary windings is connected to the anode of the LED driving assembly through the voltage adjustment module;
  • the LED driving component is configured to send a feedback signal to the voltage adjustment module according to the working voltage of the connected multiple LED light bars; the voltage adjustment module is configured to, according to the feedback signal, face the The first voltage output by the multi-channel LED driving assembly is adjusted.
  • the power supply circuit further includes: a plurality of feedback circuits, each of the LED driving components is connected to the corresponding voltage adjustment module through one of the feedback circuits;
  • the feedback circuit is configured to receive the first feedback signal output by the LED driving component, convert the first feedback signal into a second feedback signal, and output the second feedback signal to the voltage adjustment module; wherein, The reference ground levels of the first feedback signal and the second feedback signal are different.
  • the feedback circuit includes: a VI conversion circuit and a DC-DC voltage feedback circuit;
  • the VI conversion circuit is used to convert the first feedback signal in the form of a voltage signal into the second feedback signal in the form of a current signal and send it to the DC-DC voltage feedback circuit;
  • the DC-DC voltage feedback circuit is used to receive and send the second feedback signal to the voltage adjustment module.
  • the feedback circuit includes: an LED voltage feedback circuit, an isolation circuit, and a DC-DC voltage feedback circuit;
  • the LED voltage feedback circuit is used to generate a first intermediate signal according to the first voltage and the first feedback signal;
  • the isolation circuit is configured to receive the first intermediate signal and generate an isolated second intermediate signal
  • the DC-DC voltage feedback circuit is configured to receive the second intermediate signal, generate a second feedback signal according to the second intermediate signal, and send the second feedback signal to the voltage adjustment module.
  • the isolation circuit includes: a switch tube; or, an optocoupler.
  • the DC-DC voltage feedback circuit further includes:
  • a feedforward circuit for providing feedforward compensation wherein the first end of the feedforward circuit is connected to the output end of the voltage adjustment module, and the second end of the feedforward circuit is connected to the feedback input end of the voltage adjustment module .
  • the LED voltage feedback circuit further includes: a voltage stabilizing circuit, which is arranged between the output terminal of the voltage adjustment module and the reference voltage source, and is used to protect the reference voltage source.
  • the present application also provides a negative voltage ladder power supply circuit, which is configured to supply power to a plurality of LED driving components, and includes: an LLC primary winding configured to receive an input voltage;
  • the first LLC secondary winding the positive pole of the first LLC secondary winding is connected to the positive poles of the plurality of LED drive components, and the negative pole of the first LLC secondary winding is grounded; the first LLC secondary winding is Configured to output the first voltage to the positive poles of the plurality of LED driving components after converting the input voltage into a first voltage; the negative pole of the first LLC secondary winding is grounded;
  • the second LLC secondary winding is Configured to output the second voltage to the anodes of the plurality of LED driving components after converting the input voltage into a second voltage;
  • a plurality of voltage adjustment modules the positive pole of the first LLC secondary winding is connected to the positive pole of the corresponding LED drive assembly through the voltage adjustment module; the LED drive assembly is configured to, according to the connected multiple LED lights
  • the working voltage of the bar sends a feedback signal to the voltage adjustment module; the voltage adjustment module is configured to adjust the first voltage output to the multi-channel LED drive assembly according to the feedback signal.
  • each of the LED driving components is connected to the corresponding voltage adjustment module through one of the feedback circuits; the feedback circuit is configured to receive the first feedback signal output by the LED driving components, and After a feedback signal is converted into a second feedback signal, the second feedback signal is output to the voltage adjustment module; wherein the reference ground levels of the first feedback signal and the second feedback signal are different.
  • the present application provides a display device, which includes: a backlight module and a display panel; wherein the backlight module includes a plurality of power supplies, a controller, and light areas corresponding to the plurality of power supplies; a plurality of power supplies and a plurality of lights
  • the area connection is connected by the controller;
  • the multiple power sources include two types of power sources, that is, the first power source used to provide positive power signals to the controller and drive the light area, and the second power source used to drive the light area;
  • the controller is based on receiving
  • the negative power supply signal and negative reference signal are outputted by multiple power supplies, and the driving signal is outputted by negative voltage driving to drive the light area corresponding to the selected power supply to emit light.
  • the display panel provides a backlight; wherein the controller controls the first power source to work and controls the second power source to turn off in the standby mode, and controls the first power source and the second power source to work in the non-standby mode.
  • a structure of the second power supply is that the second power supply includes: a coil winding module and a first isolation voltage conversion module; the coil winding module is coupled with the first isolation voltage conversion module, and the coil winding module passes through the controller Connected to the lamp area; the first isolation voltage conversion module is used to receive the power supply signal, and output a negative reference signal after the voltage conversion; the coil winding module receives the power supply signal and the negative reference signal, and couples to obtain the negative power supply signal; among them, the negative power supply signal and the negative The reference signal is used to provide the controller to generate a driving signal.
  • a structure of the first power supply includes: a coil winding module, a second isolation voltage conversion module, and a third isolation voltage conversion module; the second isolation voltage conversion module receives the power supply signal, and the second isolation voltage conversion module The output end of the module is connected to the controller; the coil winding module is coupled to the second isolation voltage conversion module, and the coil winding module is connected to the light area through the controller; wherein the third isolation voltage conversion module receives the power supply signal; the second isolation voltage The conversion module is used to perform voltage conversion on the power supply signal to obtain a positive power supply signal and provide it to the controller; the third isolation voltage conversion module is used to perform voltage conversion on the power supply signal to obtain a negative reference signal; the coil winding module is used to receive the power supply signal and The negative reference signal is coupled to obtain a negative power supply signal; wherein, the negative power supply signal and the negative reference signal are used to provide the controller to generate a driving signal.
  • the first power supply includes: a step-down module, a first voltage conversion module, and a second voltage conversion module; the first voltage conversion module receives the power supply signal, and the first voltage conversion module The output end of the module is connected to the controller; the second voltage conversion module receives the power supply signal; the first input end of the step-down module is connected to the second voltage conversion module, the second input end of the step-down module is grounded, and the output end of the step-down module It is connected to the light area through the controller; the first voltage conversion module performs voltage conversion on the power supply signal to obtain a positive power supply signal, which is used to provide the controller; the second voltage conversion module performs voltage conversion on the power supply signal to obtain a negative reference Signal; the step-down module outputs a negative power supply signal based on the negative reference signal generated by the second voltage conversion module; wherein the negative power supply signal and the negative reference signal are used to provide the controller to generate a driving signal.
  • another structure of the second power supply is that the second power supply includes: a step-down module and a third voltage conversion module; the third voltage conversion module receives a power supply signal; The third voltage conversion module is connected, the second input end of the step-down module is grounded, and the output end of the step-down module is connected to the lamp area through the controller; the third voltage conversion module is used to perform voltage conversion on the power supply signal to obtain a negative reference signal; The step-down module is configured to output a negative power supply signal based on the negative reference signal generated by the third voltage conversion module; wherein the negative power supply signal and the negative reference signal are used to provide the controller to generate a driving signal.
  • the controller includes: a main board, a microprocessor, and multiple constant current drive modules; a first isolation module is connected between the main board and the microprocessor; the microprocessor is connected to the first power supply and multiple constant current drive modules respectively.
  • the first isolation module is used for level conversion of the control signals generated by the main board , And send the obtained control signal to the microprocessor for analysis;
  • the constant current drive module receives the negative reference signal and the negative power supply signal, and generates and sends to the corresponding The lamp area provides the driving signal.
  • the controller includes a main board, a microprocessor connected to the main board, and a plurality of constant current driving modules; the device further includes a plurality of second isolation modules, a plurality of second isolation modules and a plurality of constant current driving modules.
  • the device further includes a backplane; the high-level ends of the multiple light areas are all grounded through the backplane.
  • This application provides a display control method.
  • the control method includes: determining whether it is currently in standby mode; if it is currently in standby mode, controlling the first power source to work and controlling the second power source to turn off; if it is currently in non-standby mode, controlling the second power source The first power source and the second power source work.
  • the negative power supply signal and the negative reference signal provided by the multiple power supplies match the power of the light-emitting element in the corresponding lamp zone; before determining whether the current is in the standby mode, it also includes: light-emitting elements with the same power belong to the same lamp According to the zone rule, all the light-emitting elements of the backlight module are divided to obtain multiple lamp zones.
  • the display device provided in the present application provides a backlight for the display panel by using a backlight module powered by multiple power sources, that is, the backlight module in the present application includes multiple power sources, and these power sources respectively correspond to different light areas.
  • the multiple power supplies include a first power supply for providing a positive power supply signal for the controller and driving the light area, and a second power supply only for driving the light area.
  • the controller in the backlight module is powered by the first power source among the above-mentioned multiple power sources, and the light area corresponds to the power source according to the negative reference signal generated by different power sources and the power supply signals provided by the first power source and the second power source.
  • the lamp area sends a driving signal, so that the lamp area emits light under negative pressure driving.
  • the controller controls the first power supply to work, and the second power supply is turned off; in the non-standby mode, both the first power supply and the second power supply are in working state.
  • Figure 1 is a schematic structural diagram of a display device provided with an independent power supply board
  • Figure 2 is a schematic diagram of the connection relationship between the power board and the load
  • FIG. 3 is a schematic diagram of the TV power supply architecture
  • FIG. 4 shows a schematic diagram of a power supply circuit structure for supplying power to the main board and the LED light bar
  • FIG. 5 is a schematic structural diagram of a power supply circuit of a display device according to an embodiment of the application.
  • FIG. 6 is a schematic structural diagram of a power supply circuit of a display device according to an embodiment of the application.
  • FIG. 7 is a schematic structural diagram of a power supply circuit of a display device according to an embodiment of the application.
  • FIG. 8 is a schematic structural diagram of a power supply circuit of a display device according to an embodiment of the application.
  • FIG. 9 is a schematic structural diagram of a power supply circuit of a display device in the related art.
  • FIG. 10 is a schematic structural diagram of a power supply circuit of a display device according to an embodiment of the application.
  • FIG. 11 is a schematic diagram of the voltage range of the LED light bar of this application.
  • FIG. 12 is a schematic structural diagram of a power supply circuit of a display device according to an embodiment of the application.
  • FIG. 13 is a schematic structural diagram of a power supply circuit of a display device according to an embodiment of the application.
  • FIG. 14 is a schematic structural diagram of a power supply circuit of a display device in the related art.
  • FIG. 15 is a schematic structural diagram of a power supply circuit of a display device according to an embodiment of the application.
  • FIG. 16 is a schematic structural diagram of a power supply circuit of a display device according to an embodiment of the application.
  • FIG. 17 is a schematic diagram of the display device provided by this application.
  • FIG. 18 is a schematic structural diagram of an embodiment of a feedback circuit provided by this application.
  • FIG. 19 is a schematic diagram of the circuit structure of the feedback circuit provided by this application.
  • 20 is a schematic structural diagram of another embodiment of a feedback circuit provided by this application.
  • FIG. 21 is a schematic diagram of an embodiment of the circuit structure of the feedback circuit provided by this application.
  • 22 is a schematic diagram of another embodiment of the circuit structure of the feedback circuit provided by this application.
  • FIG. 23 is a schematic structural diagram of a display device according to an embodiment of this application.
  • FIG. 24 is a schematic structural diagram of a backlight module provided by an embodiment of the application.
  • FIG. 25 is a schematic diagram of a current flow in a lamp area provided by an embodiment of the application.
  • Figure 26 is a schematic diagram of another lamp area current flow provided by an embodiment of the application.
  • FIG. 27 is a schematic structural diagram of a power supply provided by an embodiment of the application.
  • FIG. 28 is a schematic structural diagram of a second power supply provided by an embodiment of the application.
  • FIG. 29 provides a schematic structural diagram of a third power supply according to an embodiment of the application.
  • FIG. 30 is a schematic structural diagram of a fourth power supply provided in an embodiment of this application.
  • FIG. 31 is a schematic structural diagram of a fifth power supply provided in an embodiment of this application.
  • FIG. 32 is a schematic structural diagram of an isolation mode in a negative pressure driving mode provided by an embodiment of the application.
  • FIG. 33 is a schematic structural diagram of another isolation mode in a negative pressure driving mode provided by an embodiment of the application.
  • FIG. 34 is a schematic circuit diagram of a backlight module driven by a negative voltage under the control of multiple power supplies according to an embodiment of the application;
  • FIG. 35 is a schematic flowchart of a display control method provided by this application.
  • the screens of various electronic products are getting larger.
  • the display panels of various display devices become larger and larger, correspondingly, more light-emitting elements need to be added inside the electronic products, and the light-emitting devices are provided with the power required by the light-emitting elements through the power supply or driving device.
  • the driving signal can provide sufficient light for the light emitting device to the display screen, and the information required by the user can be clearly displayed on the display screen.
  • the power supply circuit is one of the most important circuit structures in the display device.
  • the power supply circuit can provide power to the display device, so that the display device can operate normally.
  • Some display devices are provided with an independent power supply board, and some display devices combine the power supply board and the main board into one.
  • FIG. 1 is a schematic diagram of the structure of a display device provided with an independent power supply board, as shown in FIG.
  • the panel 1 is used to present images to the user;
  • the backlight assembly 2 is located below the panel 1, usually some optical components, used to supply sufficient brightness and uniformly distributed light sources, so that the panel 1 can display images normally, and the backlight assembly 2 also Including the backplane 20, the main board 3 and the power supply board 4 are arranged on the backboard 20, and some convex structures are usually stamped on the backboard 20.
  • the main board 3 and the power supply board 4 are fixed on the convex hulls by screws or hooks; the back shell 5
  • the cover is arranged on the panel 1 to hide the display device components such as the backlight assembly 2, the main board 3, and the power supply board 4 to achieve a beautiful effect; the base 6 is used to support the display device.
  • FIG. 2 is a schematic diagram of the connection relationship between the power board and the load.
  • the power board 4 includes an input terminal 41 and an output terminal 42 (the first output terminal 421 and the second output terminal are shown in the figure. 422, the third output terminal 423), wherein the input terminal 41 is connected to the mains, the output terminal 42 is connected to the load, for example, the first output terminal 421 is connected to the LED light bar used to light the display screen, and the second output terminal 422 is connected to the audio, and the third output terminal 423 is connected to the main board.
  • the power board 4 needs to convert the AC mains power into the DC power required by the load, and the DC power usually has different specifications, for example, the audio requires 18V, the panel requires 12V, and so on.
  • FIG. 3 is a schematic diagram of the power structure of the TV.
  • the display device may include: a power supply circuit 1, a load 2, a control circuit 3, and a power supply 4.
  • 4 includes: a rectifier bridge 41, a power factor correction (PFC) module 42, and a resonant converter (LLC) module 43.
  • the LLC module 43 includes a synchronous rectification circuit (not shown in FIG. 3).
  • the PFC module 42 is connected to the LLC module 43, and the LLC module 43 is connected to the power supply circuit 1 and the control circuit 3 respectively.
  • the rectifier bridge 41 is used to rectify the input AC power and input a full-wave signal to the PFC module 42.
  • the PFC module 42 mainly performs power factor correction on the input AC power supply, and outputs a stable DC bus voltage (such as 380V) to the LLC module 43.
  • the PFC module 41 can effectively improve the power factor of the power supply and ensure that the voltage and current are in the same phase.
  • the LLC module 43 usually includes components such as a synchronous rectification circuit, a pulse frequency modulation (PFM) circuit, a capacitor, an inductor, and the like.
  • the LLC module 43 can specifically step down or step up the DC bus voltage input by the PFC module 42 and output a constant voltage to the load 2.
  • the power supply 4 may also include a flyback module (not shown in FIG. 3) for providing its own power supply voltage and standby power to the PFC module 42 and the LLC module 43.
  • the control circuit 3 is connected to the power supply 4 and the power supply circuit 1 respectively, and can control whether the power supply circuit 1 is turned on, that is, control whether the electric energy output by the LLC module 43 can supply power to the load 2 through the power supply circuit, so as to turn on or off the load.
  • the power supply circuit 1 is also connected to an LLC module and a load. When the power supply circuit 1 is connected, the LLC module 43 can supply power to the load 2; when the power supply circuit 1 is disconnected, the LLC module 43 cannot supply power to the load 2.
  • the load 2 includes a main board 21, a backlight assembly 22, a display body 23, and the like.
  • FIG. 4 shows a schematic diagram of a power supply circuit structure for supplying power to the main board and the LED light bar. , 50-60Hz) after passing through the filter rectifier module (rectifier bridge), PFC module and LLC module in turn, supply power to the main board of the display device, the multi-channel LED light bar and other loads. The other loads are not shown in FIG. 4.
  • the secondary winding of the LLC module that supplies power to the multi-channel LED light bar is additionally connected to a voltage adjustment module (such as a buck circuit or a boost circuit, the boost circuit is taken as an example in Figure 4) and a voltage drive module.
  • a voltage adjustment module such as a buck circuit or a boost circuit, the boost circuit is taken as an example in Figure 4
  • the voltage adjustment module can be The real-time current feedback result of the LED light bar is adjusted and transmitted to the voltage drive module after adjusting the voltage directly output by the secondary winding, so that the voltage drive module controls the multi-channel LED light bar to work at the rated current according to the received voltage to prevent excessive voltage. Too much current flows in the LED components of the LED light bar, causing damage to the components.
  • the voltage stress of the voltage adjustment module provided for the multi-channel LED light bar in the power supply circuit is relatively large, resulting in a relatively high withstand voltage value of the switch tubes, capacitors and other components in the voltage adjustment module. High, which in turn occupies a larger area of the PCB board where the power supply circuit is located, and ultimately increases the cost of the power supply circuit.
  • the present application provides a display device and a power supply circuit, which can flexibly set the output voltage range of two different secondary windings, so that the voltage adjustment module only needs to adjust the voltage output by one of the secondary windings, thereby reducing
  • the requirements on the withstand voltage of the switching tubes, capacitors and other components in the voltage adjustment module further reduce the area of the PCB board where the power supply circuit is located, and ultimately reduce the cost of the power supply circuit.
  • FIG. 5 is a schematic structural diagram of a power supply circuit of a display device provided by an embodiment of the application.
  • the power supply circuit includes: a power supply 11, a filter and rectifier module 12, a PFC module 13, an LLC module 14 and a load.
  • the load includes at least the main board 18 and the multi-channel LED light bar shown in the figure.
  • the LLC module 14 of the power supply circuit receives the DC voltage sent by the PFC module 13 through the primary winding 141, different secondary windings output different voltages according to the voltage of the primary winding 141 to supply power to different loads, for example, the secondary The side winding 144 outputs a voltage of 12V to the main board 18 according to the voltage of the primary winding 141, and the secondary winding 145 outputs a voltage of 16V to the main board 18 according to the voltage of the primary winding 141.
  • two different LLC secondary windings are provided in the LLC module 14 to supply power to the multi-channel LED light bar, including: a first LLC secondary winding 142 and a second LLC secondary winding 143;
  • the output terminal a of the secondary winding 142 outputs the first voltage
  • the output terminal c of the second secondary winding 143 outputs the second voltage
  • the output terminal a of the second secondary winding 143 is connected to the input terminal b of the first secondary winding 142
  • the input terminal b and output terminal c of the first LLC secondary winding 142 are both connected to the voltage adjustment module 15.
  • the voltage adjustment module 15 can be used to adjust the first voltage output by the first LLC secondary winding 142, which is recorded as voltage adjustment.
  • the voltage adjusted by the module 15 is the third voltage
  • the voltage adjustment module 15 can send the third voltage and the second voltage output by the second LLC secondary winding 142 to the voltage driving module 16, and the voltage driving module 16 according to the second voltage
  • the sum of the voltage and the third voltage powers the multi-channel LED light bar.
  • the second voltage output by the second LLC secondary winding 143 is equivalent to a "fixed voltage” that does not change
  • the first voltage output by the first LLC secondary winding 142 is equivalent to a changing "variable voltage”
  • an adjustable variable voltage output is added on the basis of the fixed second voltage.
  • the fixed voltage and the variable voltage output by the two secondary windings together supply power for the multi-channel LED light bar.
  • This type of power supply can also be called " Ladder power supply”.
  • the first voltage output by the first LLC secondary winding is less than the second voltage output by the second LLC secondary winding.
  • the voltage range required for the multi-channel LED light bar is 51.3V under the condition of 120 mA. -58.5V, the total current is 1.92A.
  • the fixed second voltage output by the second LLC secondary winding can be set to 48V
  • the first voltage floating output output by the first LLC secondary winding can be set to 12V
  • the voltage range adjusted by the voltage adjustment module can be set to 3.3V-10.5V.
  • the DC-DC parameters for the buck topology are: input voltage 12V, output voltage range 3.3V-10.5V, and output current 1.92A.
  • the second voltage can be set to 40V
  • the first voltage floating output can be set to 10V.
  • the DC-DC parameters for the boost topology are: input voltage 12V, output The voltage range is 11.3V-18.5V, and the output current is 1.92A.
  • the above-mentioned buck topology and boost topology can be selected according to engineering needs. For example, the buck topology has the advantage of low cost, but the output voltage range is narrow; while the boost topology has the advantage of a wider output voltage range, but its cost is relatively high. .
  • the DC-DC parameters of the boost topology that supplies power to multiple LED strips after adjustment by only one secondary winding as shown in Figure 4 are: input voltage 45V, output voltage range 51.3V-58.5V, The output current is 1.92A.
  • the power supply circuit provided in this embodiment can flexibly set two different voltages outputted by two different secondary windings, and the voltage adjustment module only needs to perform voltage adjustment on the voltage output by the one secondary winding with the smaller voltage. The adjustment reduces the requirements for the withstand voltage of the switching tubes, capacitors and other components in the voltage adjustment module, thereby reducing the area of the PCB board where the power supply circuit is located, and ultimately reducing the cost of the power supply circuit.
  • the voltage driving module 16 can also send a feedback signal to the voltage adjustment module 15 based on the real-time current of the multiple LED light bars when powering the multiple LED light bars, so that the voltage adjustment module 15 The first voltage is adjusted to a new third voltage according to the feedback signal, thereby realizing timely and effective adjustment of the voltage by the voltage adjustment module.
  • the voltage adjustment module 15 and the voltage drive module 16 include at least two connection relationships of power supply and feedback. However, when the voltage adjustment module 15 performs DC-DC adjustment, its ground point and the second secondary side The output terminal of the winding is connected, and its voltage value is not grounded 0V, but is equivalent to adjusting the output voltage of the first secondary winding on the basis of the output voltage value of the second secondary winding.
  • the voltage drive module 16 The feedback signal sent to the voltage adjustment module also needs to pass through the optocoupler 17, so that the feedback signal is converted to floating voltage through the optocoupler, and the feedback signal sent from the voltage drive module to the voltage adjustment module is optically isolated, so that the optocoupler
  • the floating voltage of the voltage adjustment module 15 on both sides and the actual ground voltage of the voltage driving module 16 are unified to prevent mutual influence between the two.
  • FIG. 6 is a schematic structural diagram of the power supply circuit of the display device provided by an embodiment of the application.
  • the power supply circuit shown in FIG. 6 and the power supply circuit shown in FIG. The idea that the voltage adjustment module only needs to adjust the output voltage of the secondary winding with the smaller voltage is realized.
  • the power supply circuit in the embodiment shown in FIG. 6 adopts a single flyback structure, and the first secondary winding and the second secondary winding are set to output voltage through the primary winding in the single flyback structure.
  • the first secondary winding and the second secondary winding set in the illustrated embodiment are based on the output voltage of the primary winding in the LLC module.
  • the principles of other modules and the power supply circuit shown in FIG. 6 are the same as those of the embodiment shown in FIG. 5 and will not be repeated.
  • FIG. 7 is a schematic structural diagram of a power supply circuit of a display device provided by an embodiment of the application, where the power supply circuit can also be applied to the display device described in any one of FIGS. 1-3, as shown in FIG. 7
  • the output of the first secondary winding is connected to the input of the second secondary winding, and the output of the second secondary winding is used to supply power to the multi-channel LED light bar
  • the output voltage of the first secondary winding adjusted by the voltage adjustment module its input terminal is grounded and no longer floating. Therefore, in the embodiment shown in FIG. isolation.
  • the LLC module of the power supply circuit as shown in FIG. 7 is provided with a first LLC secondary winding 142 and a second LLC secondary winding 143; wherein, the input terminal a of the first secondary winding 142 is grounded, and the first secondary winding 142
  • the output terminal b of the second secondary winding 143 is connected to the input terminal c of the second secondary winding 143 through the voltage adjustment module 15, and the output terminal d of the second LLC secondary winding 143 is connected to the voltage driving module; wherein, the output terminal of the first secondary winding 142 b is used to output the first voltage.
  • the voltage adjustment module 15 can be used to adjust the first voltage output by the first LLC secondary winding 142.
  • the voltage adjusted by the voltage adjustment module 15 is the third voltage.
  • the voltage adjustment module 15 can The third voltage is sent to the input terminal c of the second LLC secondary winding 143.
  • the second LLC secondary winding 143 is used to output the second voltage.
  • the input terminal c of the second LLC secondary winding 143 is equivalent to a floating third voltage.
  • the output terminal d of the second LLC secondary winding 143 is The sum of the three voltages and the second voltage is sent to the voltage driving module 16, and the voltage driving module 16 supplies power to the multiple LED light bars according to the sum of the second voltage and the third voltage.
  • the second voltage output by the second LLC secondary winding 143 is equivalent to a "fixed voltage” that does not change
  • the first voltage output by the first LLC secondary winding 142 is equivalent to a changing "variable voltage”
  • an adjustable variable voltage output is added on the basis of the fixed second voltage.
  • the fixed voltage and the variable voltage output by the two secondary windings together supply power for the multi-channel LED light bar.
  • This type of power supply can also be called " Ladder power supply”.
  • the first voltage output by the first LLC secondary winding is less than the second voltage output by the second LLC secondary winding.
  • the power supply circuit provided in this embodiment can flexibly set two different voltages respectively output by two different secondary windings, and the voltage adjustment module only needs to adjust the voltage output by the one secondary winding with the smaller voltage. , Thereby reducing the requirements for the withstand voltage of the switching tubes, capacitors and other components in the voltage adjustment module, thereby reducing the area of the PCB board where the power supply circuit is located, and ultimately reducing the cost of the power supply circuit.
  • this embodiment does not need to provide an optocoupler, which also reduces the complexity of the power supply circuit, and further reduces the cost of the power supply circuit.
  • FIG. 8 is a schematic structural diagram of a power supply circuit of a display device provided by an embodiment of the application.
  • the power supply circuit shown in FIG. 8 on the basis of the power supply circuit shown in FIG.
  • the required variation range of a voltage can be 16V/18V
  • the secondary winding of 16V/18V voltage can be provided to the main board as the first LLC secondary winding, and there is no need to separately set the first LLC secondary winding at this time
  • the winding can further reduce the complexity of the power supply circuit, thereby reducing the cost. It is understandable that, as shown in FIG. 8, only the 16V/18V voltage of the main board is taken as an example.
  • the main board can be provided with a secondary winding of 12V voltage as the The first LLC secondary winding; or, in other possible implementations, a secondary winding that provides a certain voltage to other loads can also be used as the first LLC secondary winding shown, and the implementation method is the same as the principle, and will not be repeated .
  • the power supply circuit provides stepwise power supply voltages to the drive modules of the multiple LED light bars.
  • the power supply circuit may also provide each LED light bar in at least one LED light bar.
  • the light bar alone provides a stepped power supply voltage. In an embodiment of the present application and subsequent embodiments, this application scenario will be described.
  • FIG. 9 is a schematic diagram of the structure of the power supply circuit of a display device in the related art, in which the AC power (100V-240V, 50-60Hz) obtained in the power supply circuit passes through the filter rectifier module (rectifier bridge), PFC module and After the LLC module, it supplies power to the main board of the display device, at least one LED light bar, and other loads.
  • at least one LED light bar includes two LED light bars labeled 1 and 2 as an example.
  • the first secondary winding in the LLC module provides 12V voltage to the main board
  • the second secondary winding provides 18V voltage to the main board
  • the third secondary winding provides voltage to the LED light bars 1 and 2.
  • each LED strip in at least one LED strip needs to work with a certain range of voltage drop to reach the rated current of the LED component, so the LED strip in Figure 9 1
  • the output terminals of and 2 are each connected to a voltage adjustment module based on a buck circuit, and the voltage adjustment module adjusts the voltage output from the secondary winding to the corresponding LED light bar, so that the LED light bar works at the rated current to prevent excessive current flow
  • the LED components in the LED light bar cause damage to the components.
  • the voltage stress of the voltage adjustment module connected to each LED light bar in the power supply circuit is relatively large.
  • the adjustment of step-up or step-down results in higher withstand voltages of the switching tubes, capacitors and other components in the voltage adjustment module, which in turn occupies a larger area of the PCB board where the power supply circuit is located, and ultimately increases the cost of the power supply circuit.
  • FIG. 10 is a schematic structural diagram of a power supply circuit of a display device provided by an embodiment of the application, where the power supply circuit includes: a power supply 11, a filter rectifier module 12, a PFC module 13, an LLC module 14 and a load.
  • the load includes at least the main board 18 and the LED light bar 1 and LED light bar 2 shown in the figure.
  • the secondary winding 144 outputs a voltage of 12V to the main board 18 according to the voltage of the primary winding 141, and the secondary winding 145 according to The voltage of the primary winding 141 provides a voltage of 18V to the output of the main board 18.
  • two different LLC secondary windings are provided in the LLC module 14 to supply power to at least one LED light bar.
  • the two different LLC secondary windings include: a first LLC secondary winding 142 and a second LLC secondary winding. LLC secondary winding 143; wherein, the input terminal a of the first secondary winding 142 is grounded, the output terminal b of the first secondary winding 142 is connected to the input terminal c of the second secondary winding 143, and the second LLC secondary winding 143
  • the output terminal d is respectively connected to the positive poles of the LED light bar 1 and 2; among them, the output terminal b of the first secondary winding 142 is used to output the first voltage, so for the voltage adjustment module based on the buck circuit to which the LED light bar 1 is connected 15 can be used to adjust the first voltage output by the first LLC secondary winding 142, and record the adjusted voltage as the third voltage, and the voltage adjustment module 15 can send the third voltage to the input terminal c of the second secondary winding 143 .
  • the second LLC secondary winding 143 is used to output the second voltage, and the output terminal d of the second LLC secondary winding 143 sends the sum of the third voltage and the second voltage to the LED light bar 1 for power supply.
  • the voltage adjustment module 16 based on the buck circuit that is connected to the LED light bar 2 can be used to adjust the first voltage output by the first LLC secondary winding 142, and the adjusted voltage is the fourth voltage.
  • the adjustment module 15 may send the fourth voltage to the input terminal c of the second secondary winding 143.
  • the second LLC secondary winding 143 is used to output the second voltage, and the output terminal d of the second LLC secondary winding 143 sends the sum of the fourth voltage and the second voltage to the LED light bar 2 for power supply.
  • the second voltage output by the second LLC secondary winding 143 is equivalent to a “fixed voltage” that does not change, and the first voltage output by the first LLC secondary winding 142 is equivalent to a changing “variable voltage”.
  • an adjustable variable voltage output is added.
  • the fixed voltage and variable voltage output by the two secondary windings together supply power for the LED light bar.
  • This form of power supply can also be called “ladder power supply”.
  • each LED light bar can be connected to a separate voltage adjustment module, so that each voltage adjustment module can more effectively adjust the voltage of the connected LED light bar.
  • two LED light bars are taken as an example. Any number of other LED light bars can be included in the power supply circuit. It is only a simple increase or decrease in number, but the principle is the same. Go into details again.
  • the first voltage output by the first LLC secondary winding is less than the second voltage output by the second LLC secondary winding.
  • the voltage of the fixed voltage part plus the voltage of the variable voltage part should be approximately the overall voltage drop required by the LED light bar, otherwise the circuit will not work normally; at the same time, the voltage drop of the fixed voltage part cannot be greater than the LED light needs to light up. The minimum voltage, otherwise the LED strip will light up uncontrollably.
  • FIG. 11 is a schematic diagram of the voltage range of the LED light bar of this application, where the LED light bar in the display device exhibits a range of voltage drop due to process factors under the condition of a certain current.
  • the voltage of the LED light bar is 6V
  • its voltage range can be 5.7 to 6.5V. Therefore, in this implementation, in order to achieve the output voltage range of power supply to the LED light bar up to 5.7 ⁇ 6.5V, the fixed second voltage output by the second secondary winding can be taken as 5.7V, and the first secondary The first voltage of the winding output is about 0.8V.
  • the voltage drop of the LED light bar is uncertain at this time, when the current is constant, the proportion of the uncertain voltage to the total voltage is not high. In the range of 5.7V to 6.5V, the variable voltage is only 0.8V, and the fixed voltage is 5.7V, which can meet the needs of LED light bar driving.
  • the power supply circuit provided in this embodiment can flexibly set two different voltages respectively output by two different secondary windings, and the voltage adjustment module only needs to adjust the voltage output by the one secondary winding with the smaller voltage. , Thereby reducing the requirements for the withstand voltage of the switching tubes, capacitors and other components in the voltage adjustment module, thereby reducing the area of the PCB board where the power supply circuit is located, and ultimately reducing the cost of the power supply circuit.
  • this embodiment does not need to provide an optocoupler, which also reduces the complexity of the power supply circuit, and further reduces the cost of the power supply circuit.
  • FIG. 12 is a schematic structural diagram of a power supply circuit of a display device according to an embodiment of the application.
  • the power supply circuit shown in FIG. 12 and the power supply circuit shown in FIG. 10 both adopt the following scheme: two different secondary windings are provided The two different voltages respectively output power the LED light bar together, and the voltage adjustment module only needs to adjust the voltage output by the secondary winding with the smaller voltage.
  • the power supply circuit in the embodiment shown in FIG. 12 adopts a single flyback structure, and the first secondary winding and the second secondary winding are set to output voltage through the primary winding in the single flyback structure.
  • the first secondary winding and the second secondary winding set in the illustrated embodiment are based on the output voltage of the primary winding in the LLC module.
  • the principles of the other modules and the power supply circuit shown in FIG. 12 are the same as those of the embodiment shown in FIG. 10, and will not be repeated here.
  • FIG. 13 is a schematic structural diagram of a power supply circuit of a display device provided by an embodiment of the application.
  • the first LLC secondary winding outputs When the required variation range of the first voltage can be 18V, the secondary winding that provides the 18V voltage to the main board can be used as the first LLC secondary winding. At this time, there is no need to separately set the first LLC secondary winding.
  • the complexity of the power supply circuit can be further reduced, thereby reducing the cost. It is understandable that, as shown in FIG. 13, only the 18V voltage of the main board is taken as an example.
  • the main board can be provided with a secondary winding with a voltage of 12V as the first LLC secondary winding; or, in other possible implementations, a secondary winding that provides a certain voltage for other loads may also be used as the first LLC secondary winding shown, and the implementation method is the same as the principle, and will not be repeated.
  • FIG. 14 is a schematic structural diagram of a power supply circuit of a display device in the related art.
  • a voltage adjustment module based on a buck circuit is taken as an example, and in other possible implementation manners, the voltage adjustment module is also Can be realized based on boost circuit.
  • Figure 14 shows that in the power supply circuit of the related art, the first secondary winding in the LLC module provides 12V voltage to the main board, the second secondary winding provides 18V voltage to the main board, and the third secondary winding supplies the LED lights. Articles 1 and 2 provide voltage.
  • the switch tube, capacitor and other components of the voltage adjustment module have a higher withstand voltage, which in turn occupies a larger area of the PCB board where the power supply circuit is located, and ultimately increases the cost of the power supply circuit.
  • FIG. 15 is a schematic structural diagram of a power supply circuit of a display device provided by an embodiment of the application.
  • the power supply circuit to supply power to two LED light bars 1 and 2 as an example, three different LLC sub-systems are provided in the LLC module 14
  • the side windings supply power to the LED light bars 1 and 2, including: a first LLC secondary winding 142, and two second LLC secondary windings 143 and 146; wherein, the input terminal a of the first secondary winding 142 is grounded, and the first secondary winding 142 is grounded.
  • the output terminal b of a secondary winding 142 is connected to the voltage regulation module 15 and the voltage regulation module 16, the input terminal c of the second LLC secondary winding 143 is connected to the voltage regulation module 15, the output terminal d is connected to the LED light bar 1, the second LLC secondary
  • the input terminal e of the side winding 146 is connected to the voltage adjustment module 16, and the output terminal f is connected to the LED light bar 2. It is understandable that when the power supply circuit supplies power to more LED light bars, a second secondary winding and voltage adjustment module can be provided for each LED light bar, and they can be connected in the same way as shown in Figure 15. It is the same as the principle and will not be repeated here.
  • the voltage adjustment module 15 based on the boost circuit connected to the LED light bar 1 can be used to adjust the first voltage output by the first LLC secondary winding 142, and the adjusted voltage is the third voltage.
  • the voltage adjustment module 15 can send the third voltage to the input terminal c of the second secondary winding 143.
  • the second LLC secondary winding 143 is used to output the second voltage, and the output terminal d of the second LLC secondary winding 143 sends the sum of the third voltage and the second voltage to the LED light bar 1 for power supply.
  • the voltage adjustment module 16 based on the boost circuit that is connected to the LED light bar 2 can be used to adjust the first voltage output by the first LLC secondary winding 142, the adjusted voltage is the fourth voltage, and the voltage adjustment The module 15 can send the fourth voltage to the input terminal e of the second secondary winding 146.
  • the second LLC secondary winding 146 is used to output the fifth voltage, and the output terminal f of the second LLC secondary winding 143 sends the sum of the fourth voltage and the fifth voltage to the LED light bar 2 for power supply.
  • the second voltage output by the second LLC secondary winding 143 and the fifth voltage output by the third LLC secondary winding 146 are equivalent to the “fixed voltage” that does not change, and the first LLC secondary winding
  • the first voltage output by the 142 is equivalent to the changing "variable voltage", so an adjustable variable voltage output is added to the fixed second voltage.
  • the fixed voltage and the variable voltage output by the two secondary windings are both the LED Light bar power supply, this form of power supply can also be called “ladder power supply”.
  • each LED light bar can be connected to a separate voltage adjustment module and a separate LLC secondary winding, so that each voltage adjustment module can more effectively adjust the voltage of the connected LED light bar.
  • the power supply circuit uses an LLC module for power supply, and the LLC module is provided with a first secondary winding, a second secondary winding, and a third secondary winding.
  • the power supply circuit may also adopt the first secondary winding and the second secondary winding provided in the single flyback structure, and output voltage through the primary winding in the single flyback structure.
  • FIG. 16 is a schematic structural diagram of a power supply circuit of a display device provided by an embodiment of the application.
  • the first LLC secondary winding outputs When the required variation range of the first voltage can be 18V, the secondary winding that provides the 18V voltage to the main board can be used as the first LLC secondary winding. At this time, there is no need to separately set the first LLC secondary winding.
  • the complexity of the power supply circuit can be further reduced, thereby reducing the cost. It is understandable that, as shown in FIG. 16, only the 18V voltage of the main board is taken as an example.
  • the main board can be provided with a secondary winding with a voltage of 12V as the first LLC secondary winding; or, in other possible implementations, a secondary winding that provides a certain voltage for other loads may also be used as the first LLC secondary winding shown, and the implementation method is the same as the principle, and will not be repeated.
  • the voltage conversion circuit cannot be used in parallel, it is necessary to add windings or diodes in the LLC module to achieve the technical problem of stepped power supply, resulting in a more complicated structure of the power supply circuit. Therefore, the following embodiments provide solutions.
  • This application provides a display device and a negative voltage ladder power supply circuit, so that the power supply circuit only needs to provide a LLC secondary winding in the LLC module to provide a negative voltage, and combine with another LLC secondary winding to provide a positive first voltage ,
  • Two LLC secondary windings can be connected in parallel to provide voltage for the driving components of multiple LED light bars connected by multiple voltage conversion circuits at the same time, so that multiple voltage conversion circuits can be connected to the same LLC secondary winding Connect the same negative voltage grounding point to realize the parallel connection of multiple voltage conversion circuits in the power supply circuit, and the LLC secondary winding simultaneously supplies power to the multiple LED drivers.
  • FIG. 17 is a schematic diagram of a display device provided by this application.
  • the power supply circuit provided in the display device as shown in FIG. 17 can supply power to multiple LED driving components in the display device.
  • LED driver components a161 and LED driver components a162 are taken as examples. Each LED driver component can be used to supply power to the multiple LED light bars connected to it, and the multiple LED light bars connected to all the LED drive components can be Commonly used to light up the display of the display device.
  • the power supply circuit includes: plug a11, filter rectifier module a12, PFC module A13, and LLC module a14.
  • the power supply circuit can also be based on different working conditions, including the above All or part of the module. Then when the power supply circuit obtains the mains AC power (100V-240V, 50-60Hz) from the plug a11, the mains AC power is processed by the filter rectifier module a12 (rectifier bridge), PFC module A13 and LLC module A14 to obtain different voltages.
  • the DC power supply powers the load.
  • the secondary winding a143 provides the main board a18 with a voltage of 12V according to the voltage of the primary winding a141, and the secondary winding a142 according to the original
  • the voltage of the side winding a141 provides a voltage of 18V to the main board a18.
  • the above voltages of 12V and 18V are only examples, and the secondary winding a142 and the secondary winding a143 may also provide voltages of other voltage values to the main board a18, respectively.
  • the first LLC secondary winding is used to provide a positive first voltage to a plurality of LED driving components
  • the second LLC secondary winding is used to provide a negative second voltage to a plurality of LED driving components.
  • the first LLC secondary winding that provides the first forward voltage may be the secondary winding a143 (the first voltage is 12V) and the secondary winding a142 (the first voltage is 18V).
  • the positive pole of the first LLC secondary winding is connected to the positive poles of the multiple LED driving components, that is, the first LLC secondary winding
  • the positive pole of the winding a143 is simultaneously connected to the positive pole of the LED driving component a161 and the positive pole of the LED driving component a162, and the negative pole of the first LLC secondary winding a143 is grounded, that is, the first LLC secondary winding uses the reference ground as the reference level.
  • the negative second voltage can be provided by the second LLC secondary winding a144 in the LLC module A14, wherein the positive pole a of the second LLC secondary winding is grounded, and the negative pole b of the second LLC secondary winding is respectively connected to a plurality of LEDs.
  • the negative electrode of the driving component that is, the negative electrode of the second LLC secondary winding is connected to the negative electrode of the LED driving component a161 and the negative electrode of the LED driving component a162 at the same time. Since the second LLC secondary winding a144 can be used to convert the input voltage of the LLC primary winding a141 into a second voltage, the negative pole b of the second LLC secondary winding a144 is equivalent to providing a negative second voltage at this time.
  • the power supply circuit also includes a plurality of voltage adjustment modules, each LED drive assembly is connected to a corresponding voltage adjustment module, each voltage adjustment module can be used to output to the LED assembly
  • the voltage is adjusted, and the voltage adjustment module may be implemented by a buck or boost structure, or may be a DC-DC chip.
  • the first LLC secondary winding of the LLC module A14 is connected to the LED drive assembly a161 through the voltage adjustment module a171, and is connected to the LED drive assembly a162 through the voltage adjustment module 172.
  • the LED driving component a161 is taken as an example for description.
  • the primary winding a141 of the LLC module A14 receives the PFC module A13
  • the first LLC secondary winding a143 converts the input voltage into a first voltage (denoted as VOUT), and outputs the first voltage to the anode of the LED drive assembly a161 through the voltage adjustment module a171, and the second LLC secondary
  • the winding a144 converts the input voltage into a second voltage, denoted as (-VLED), and outputs the second voltage to the negative electrode of the LED drive component a161.
  • the LED drive component a161 it is equivalent to the negative -VLED as The reference ground level, the voltage on both sides of which is the sum of the absolute value of the first voltage VOUT and the second voltage -VLED. Since the second voltage -VLED output by the second LLC secondary winding a144 will not change, it is recorded as "fixed voltage”, and the first voltage output by the first LLC secondary winding a143 can be adjusted by the voltage adjustment module a171, recorded as " “Variable voltage”, so the fixed voltage and the variable voltage output by the two secondary windings together supply power for the multi-channel LED light bar, thereby achieving stepped power supply.
  • the first voltage VOUT output by the first LLC secondary winding a143 is less than the absolute value of the second voltage -VLED output by the second LLC secondary winding.
  • the LED driving component a161 can also determine the working voltage of the LED light bar to which it is connected, and when the working voltage changes, send a feedback signal to the voltage adjustment module a171, so that the voltage adjustment module a171 provides it to the LED driving component according to the feedback signal
  • the voltage of a161 is adjusted so that the LED driver a161 can drive the LED light bar to maintain its rated normal working current.
  • the power supply circuit provided by this embodiment can simultaneously provide multiple voltages connected in parallel through the positive first voltage provided by the first LLC secondary winding and the negative second voltage provided by the second LLC secondary winding.
  • the conversion circuit and the LED drive assembly supply power, so that the multiple voltage conversion circuits can connect the positive output end of the first LLC secondary winding to one end of the second LLC secondary winding providing -VLED, so that the multiple voltage conversion circuits are in the power supply circuit.
  • Connected in parallel, and the LLC secondary winding simultaneously supplies power to the multiple LED drivers.
  • multiple voltage conversion circuits can each provide the current required by the multiple LED light strips to the connected LED drive components, as shown in the figure Compared with the embodiment shown in Fig.
  • this application also provides a feedback circuit, which is implemented as shown in Figure 17 In the example, between each LED drive component and the voltage adjustment module, it is used to receive the first feedback signal output by the LED drive component. After the first feedback signal is converted, the second feedback signal corresponding to the voltage adjustment module is obtained. Second, the feedback signal is sent to the voltage adjustment module.
  • FIG. 18 is a schematic structural diagram of an embodiment of the feedback circuit provided by this application.
  • the power supply circuit of FIG. 17 is provided between the LED drive component a161 and the voltage adjustment module a171.
  • the feedback circuit a20 is taken as an example.
  • the feedback circuit a20 includes: a VI conversion circuit and a DC-DC voltage feedback circuit, where the VI conversion circuit is used to convert the first feedback signal in the form of a voltage signal sent by the LED drive component a161 into the corresponding DC-DC voltage feedback circuit The second feedback signal in the form of a current signal, and realizes level conversion.
  • the DC-DC voltage feedback circuit is used to receive and send the second feedback signal to the voltage adjustment module a171.
  • FIG. 19 is a schematic diagram of the circuit structure of the feedback circuit provided by this application, showing a specific circuit implementation of the structure shown in FIG. 18, where the VI conversion circuit includes: an operational amplifier N1, a transistor V1, and a first resistor R4, The first input terminal (which can be the positive electrode) of the operational amplifier N1 is connected to the LED driving component a161, and the second input terminal (which can be the negative electrode) of the operational amplifier N1 is connected to the first terminal of the transistor V1 and the first terminal of the first resistor R4, The output terminal of the amplifier N1 is connected to the control terminal of the transistor V1, and the second terminal of the first resistor R4 is connected to the negative electrode of the second LLC secondary winding, so that the reference ground level of the VI conversion circuit is- VLED.
  • the VI conversion circuit includes: an operational amplifier N1, a transistor V1, and a first resistor R4,
  • the first input terminal (which can be the positive electrode) of the operational amplifier N1 is connected to the LED driving component a161
  • the DC-DC feedback circuit includes a second resistor R1, a third resistor R2, and a fourth resistor R3.
  • the first end of the second resistor R1 is connected to the output terminal VOUT of the voltage adjustment module a171, and the second end of the second resistor R1 is connected to the The first end of the three resistor R2, the first end of the fourth resistor R3 and the feedback input end of the voltage adjustment module a171, the second end of the fourth resistor R3 is connected to the second end of the transistor V1, and the second end of the third resistor R2 Ground so that the DC-DC feedback circuit is connected to the reference ground.
  • the operational amplifier N1 receives the first feedback signal FB sent by the LED driving component a161, it controls V1 to be turned on, so that the DC-DC voltage feedback circuit generates from VOUT to the reference ground, and flows through the second resistor R1 and the fourth resistor.
  • the current signal of R3, the current signal at the second end of the second resistor R1 can be used as the second feedback signal, which is input to the feedback input terminal of the voltage adjustment module a171, so that after the voltage adjustment module a171 receives the second feedback signal, it outputs it to the LED
  • the voltage VOUT of the driving component a161 is adjusted.
  • the first LLC secondary winding that provides a fixed voltage in the LLC module has voltage fluctuations of several kHz, it is completely dependent on the constant current control chip in the LED drive assembly.
  • the feedback speed of the feedback signal is slow, which may cause high-frequency fluctuations in the voltage provided to the LED light bar, which in turn leads to fluctuations in the operating current of the LED light bar.
  • FIG. 20 is a schematic structural diagram of another embodiment of the feedback circuit provided by this application.
  • the feedback circuit shown in FIG. 20 includes: an LED voltage feedback circuit a203, an isolation circuit a204, and a DC-DC voltage feedback circuit a201.
  • the DC-DC voltage feedback circuit a201 is connected to the reference ground, and the reference ground of the LED voltage feedback circuit remains the same as that of the LED drive component a161, and both are connected to the negative pole of the second LLC secondary winding, so that the reference ground level is -VLED, the isolation circuit a204 is used to electrically isolate the LED voltage feedback circuit a203 and the DC-DC voltage feedback circuit a201 on both sides.
  • the LED voltage feedback circuit is used to generate a first intermediate signal according to the first voltage VOUT and the first feedback signal, and send it to the isolation circuit a204.
  • the isolation circuit converts the first intermediate signal of the LED driving component a161 into a second intermediate signal for output
  • the DC-DC feedback circuit can generate a second feedback signal according to the second intermediate signal and send it to the voltage adjustment module, which can also solve the problem of different reference low levels of the circuits on both sides.
  • FIG. 21 is a schematic diagram of an embodiment of the circuit structure of the feedback circuit provided by this application, showing a specific circuit implementation of the structure shown in FIG. 20, where the isolation circuit a204 may be a switch tube T1, and the switch tube T1 It can be a triode, MOS tube, etc.
  • the first terminal of the switch tube T1 is connected to the voltage output terminal VOUT of the voltage adjustment module a171, the second terminal is connected to the DC-DC voltage feedback circuit a201, and the control terminal is connected to the LED voltage feedback circuit a203, so that the switch tube T1 can be connected to the LED voltage feedback circuit a203 Under the control, isolation is achieved by turning on and off the transmission signal.
  • the DC-DC voltage feedback circuit a201 includes: a second resistor R1, a third resistor R2, and a fourth resistor R3; the first end of the second resistor R1 is connected to the voltage output end of the voltage adjustment module a171, and the second end of the second resistor R1 Connect the first end of the third resistor R2, the first end of the fourth resistor R3 and the feedback input end of the voltage adjustment module a171, the second end of the fourth resistor R3 is connected to the second end of the switch tube T1; The second end is grounded, so that the DC-DC feedback circuit a201 is connected to the reference ground.
  • the DC-DC voltage feedback circuit a201 can independently realize the feedback to VOUT, and the R1 resistance of the second resistor should be set larger to meet the requirement that the DC-DC output voltage can reach the set maximum voltage output, and the fourth The resistor R3 can adjust the minimum value of the output voltage, or the resistance value of the fourth resistor R3 can also be 0R.
  • the DC-DC voltage feedback circuit a201 as shown in FIG. 21 may further include: a feedforward circuit for performing feedforward compensation for the entire DC-DC loop.
  • the feedforward circuit includes a fifth resistor R11 and a second capacitor C1.
  • the first end of the fifth resistor R11 is connected to the voltage output terminal VOUT of the voltage adjustment module a171, and the second end of the fifth resistor R11 passes through the second capacitor C11. Connect the feedback input terminal of the voltage adjustment module a171.
  • the LED voltage feedback circuit a203 includes: a reference voltage source N1, a first voltage divider resistor (in Figure 21, R7 and R8 are taken as examples, which can be a resistor), a second voltage divider resistor R9, a bias resistor R4, and a current limiting resistor R5 ;
  • the first terminal R7 of the first voltage dividing resistor is connected to the output terminal VOUT of the voltage adjustment module a171, and the second terminal R8 of the first voltage dividing resistor is connected to the first terminal of the second voltage dividing resistor R9 and the control terminal of the reference voltage source N1 ,
  • the first terminal of the reference voltage source N1 passes through the first terminal and the second terminal of the current limiting resistor R5 in turn, and the first terminal and the second terminal of the bias resistor R4 are connected to the output terminal VOUT of the voltage adjustment module a171, and the bias resistor R4
  • the first end of and the second end of the current limiting resistor R5 are connected to the control end of the switch tube T
  • the reference voltage source N1 may be TL431.
  • the reference voltage source N1, the first voltage dividing resistor (R7 and R8) and the second voltage dividing resistor R9 in the LED voltage feedback circuit a203 can realize feedback together.
  • VOUT changes VOUT passes through the first voltage dividing resistor and the second voltage dividing resistor.
  • the voltage divider of the voltage divider controls the turn-on and turn-off of the reference voltage source N1.
  • the first feedback signal generated by the constant current control chip in the LED driving component a161 can also be directly sent to the control terminal of the reference voltage source N1 through the resistor R10.
  • the bias resistor R4 is used to provide the bias current of the reference voltage source N1, and the current limiting resistor R5 is used to limit the current.
  • the LED voltage feedback circuit a203 When the overall voltage value of the LED voltage feedback circuit a203 is large, it can be connected to the output terminal VOUT and VOUT of the voltage adjustment module a171.
  • a voltage stabilizing circuit is added between the reference voltage source N1, for example, the voltage stabilizing circuit includes: a voltage stabilizing diode VZ1. The voltage stabilizing circuit can be used to protect the reference voltage source N1.
  • the LED voltage feedback circuit can perform overall voltage feedback based on the sum of the overall voltage (VOUT and VLED), thereby adjusting the bandwidth output of the reference voltage source N1 in the LED feedback circuit. Solve the influence of the voltage fluctuation of the first LLC secondary winding of the fixed voltage on the voltage and working current of the LED light bar.
  • FIG. 22 is a schematic diagram of another embodiment of the circuit structure of the feedback circuit provided by this application, showing another specific circuit implementation of the structure shown in FIG. 20, wherein the structure shown in FIG. 22 is similar to that shown in FIG. 21 , The difference is that the isolation circuit is replaced by the switch tube T1 with the optocoupler O1, and the connection relationship in the LED voltage feedback circuit needs to be adjusted adaptively.
  • the first terminal of the reference voltage source N1 is connected to the output terminal VOUT of the voltage adjustment module a171 through the bias resistor R4, the first terminal of the current limiting resistor R5 is connected to the output terminal VOUT of the voltage regulation module a171, and the second terminal of the current limiting resistor R5 Terminal is connected to the first input terminal of the optocoupler O1, the first terminal R8 of the first voltage divider resistor is connected to the second input terminal of the optocoupler O1 through the first capacitor C2, and the first output terminal of the optocoupler O1 is connected to the voltage adjustment module a171
  • the output terminal VOUT and the second output terminal of the optocoupler O1 are connected to the fourth resistor R3 in the DC-DC voltage feedback circuit a201.
  • a display device usually includes a backlight module and a display panel.
  • the backlight module may be provided with a power supply, a main board, a light-emitting device, and a light-emitting driving device corresponding to the light-emitting device.
  • the power supply can supply power to the main board and the light-emitting drive device, so that the main board receives the image signal transmitted from the external server or optical fiber, and transmits the control signal to the light-emitting drive device through the processing of the image signal by the controller on the main board, so that the light-emitting drive device receives
  • the control signal is analyzed, the light area is driven according to the information about the working status of the light area carried in the control signal.
  • the backlight module increases or when the display brightness of the display panel needs to be increased, the power required by the backlight module increases, and the above method cannot meet the requirements of the backlight module.
  • the display device and display control method provided in the present application aim to solve the above technical problems of related technologies.
  • FIG. 23 is a schematic structural diagram of a display device provided by an embodiment of the application.
  • the display device includes a backlight module and a display panel.
  • the backlight module is provided with multiple power sources, controllers, and light areas corresponding to the multiple power sources; among the multiple power sources, there are two types of power sources.
  • One type of power source is the first power source, and the first power source is used to control The device provides a positive power supply signal and drives the light zone corresponding to the first power supply to work.
  • Another type of power source is a second power source, and the second power source is used to drive the lamp area corresponding to the second power source to work.
  • the corresponding relationship between the power supply and the light zone in this embodiment can be that one power supply corresponds to multiple light zones, or one power supply corresponds to one light zone; and the first power supply and the second power supply each The number can be one or more, and there is no specific limitation.
  • the lamp area in the embodiment of the present application emits light by receiving the driving signal generated by the controller, where the driving signal generated by the controller is generated by a negative pressure driving method.
  • the driving signal generated by the controller is generated by a negative pressure driving method.
  • multiple power supplies are used to output negative voltage.
  • the power supply signal and the negative reference signal, and the drive signal is generated by the controller through the control signal and the negative power supply signal and the negative reference signal provided by the received power supply.
  • controller in this embodiment can also be used to control the first power supply to work and the second power supply to be turned off in the standby mode. In the non-standby mode, both the first power supply and the second power supply are in working state by controlling.
  • FIG. 24 is a schematic structural diagram of a backlight module provided by an embodiment of the application.
  • Figure 24 only takes two power supplies and two light zones as an example, and one power source corresponds to one light zone, power source a corresponds to light zone a, and power source b corresponds to light zone b.
  • the power supply a is the first power supply mentioned in Figure 23, which is used to provide a positive power supply signal for the controller, and the power supply a also provides a negative reference signal and a negative power supply signal for the controller, so that the controller provides a negative reference signal on the power supply a , Under the action of the negative power supply signal and the control signal generated by the controller through external instructions, the lamp area a is driven to emit light.
  • the power supply b is the second power supply mentioned in Figure 23, which provides a negative reference signal and a negative power supply signal for the motherboard, so that the controller is under the action of the reference signal provided by the power supply b, the power supply signal, and the control signal generated by the controller through an external command. , Drive the light area b to emit light.
  • a plurality of power supplies drive the corresponding light areas of the power supply through the controller.
  • FIG. 25 is a schematic diagram of a current flow in a lamp area provided by an embodiment of the application, in which the driving mode of the controller is an existing positive voltage driving mode.
  • the current direction of light area b starts from the corresponding power supply b corresponding to light area b, and passes through the controller, the positive terminal of light area b, and light area b.
  • the negative terminal of the controller returns to the corresponding power source b, forming a current loop.
  • the power supply signal provided by the power supply b for the light-emitting drive module is a positive electric signal.
  • Figure 25 only shows a schematic diagram of the current flow between any one of the multiple power supplies and its corresponding lamp area.
  • the current flow loop between the other power supplies and its corresponding lamp area is the same as that, and the dashed line in Figure 3 only represents the current flow. , Does not represent the actual connection line.
  • the mode in which the controller drives the lamp area to work is a negative pressure driving mode.
  • the positive terminal of each light area is grounded, and the negative terminal of each light area is connected to the light-emitting drive module.
  • the controller can be connected to the first power source of the multiple power sources, and the first power source provides positive power to it; in addition, the controller and multiple power sources have a connection relationship, and at this time, the first power source of the multiple power sources Both the second power supply and the second power supply provide a negative power supply signal and a negative reference signal to the controller.
  • the display device may also include a backplane, and the positive terminal of each light area may also be connected to the backplane and then connected to the ground through the backplane.
  • the light-emitting device is electrically connected to the backplane.
  • FIG. 26 is a schematic diagram of another lamp area current flow provided by an embodiment of the application, in which the driving mode of the controller driving the lamp area is a negative pressure driving mode.
  • the current direction of lamp area b starts from the corresponding power supply b corresponding to lamp area b, and passes through the back plate, the positive terminal of lamp area b, and lamp area b.
  • the negative terminal of the controller returns to the corresponding power source b.
  • the power supply signal provided by the power supply b for the light-emitting drive module is a negative power supply signal.
  • Figure 26 only shows a schematic diagram of the current flow between any one of the multiple power supplies and its corresponding lamp zone in the negative voltage driving mode, and the current flow loop between the other power supplies and its corresponding lamp zone is the same as that in Figure 26
  • the dashed line only represents the direction of current flow, not the actual connection line.
  • the driving mode of the lamp area in the display device is negative pressure driving mode.
  • the positive terminal of the lamp area can be driven by screws. Connect it to the backplane or directly ground, through the above connection relationship, the connection lines between the light area and the controller and the number of connectors of the connection lines can be reduced, thereby reducing the area of the circuit board occupied by the controller.
  • FIG. 27 is a schematic structural diagram of a power supply provided by an embodiment of the application. As shown in FIG. 27, the power supply structure of the present application is applicable to the second power supply in FIG. 23.
  • the second power supply includes: a coil winding module b41 and a first isolation voltage conversion module b42.
  • the coil winding module b41 is coupled to the primary coil in the first isolation voltage conversion module b42, and the coil winding module b41 is connected to the light area through the controller;
  • the first isolation voltage conversion module b42 can be used to receive power supply signals and After voltage conversion of the power supply signal, the negative reference signal is output and provided to the controller and the coil winding module b41;
  • the coil winding module b41 is used for coupling after receiving the power supply signal and the negative reference signal generated by the first isolation voltage conversion module b42 The negative power supply signal is obtained and provided to the controller; wherein, the negative power supply signal and the negative reference signal are used to provide the controller to generate a driving signal.
  • the power supply signal received by the first isolation voltage conversion module b42 is commercial power.
  • the power supply signal received by the first isolation voltage conversion module b42 is a power supply signal processed on the mains.
  • the processing process includes: filtering, filtering rectification, and power factor correction.
  • the second power supply may also include a filter module, a filter rectifier module, a power factor correction module, and other modules for processing the mains.
  • FIG. 28 is a schematic structural diagram of a second power supply provided by an embodiment of the application. As shown in FIG. 28, the filter module b51 filters the received commercial power, such as high-frequency filtering. In some embodiments, the filter module b51 may not be provided.
  • the filtering and rectification module b52 performs filtering and rectification on the filtered signal, and converts the received AC wave signal into a full wave signal.
  • the power factor correction module b53 is used to adjust the phase of the power supply signal generated by the filtering rectification module b52, so that the phases of the current and voltage are the same, and the power factor of the power supply can be effectively improved.
  • the power factor correction module b53 can also be omitted.
  • the power factor correction module b53 provides the corrected power supply signal to the coil winding module b41 and the first isolation voltage conversion module b42.
  • the negative power supply signal and the negative reference signal can be output to the controller by adding the coil winding b41, so that the controller can drive the lamp zone to work in a negative voltage driving manner.
  • FIG. 29 provides a schematic structural diagram of a third power supply according to an embodiment of the application.
  • the power supply structure of the present application is applicable to the first power supply in FIG. 23.
  • the first power supply includes: a coil winding module b71, a second isolation voltage conversion module b72, and a third isolation voltage conversion module b73;
  • the second isolation voltage conversion module b72 is used to receive the power supply signal, and by performing voltage conversion on the power supply signal, the second isolation voltage conversion module b72 generates a positive power supply signal, and provides the positive power supply signal to the second isolation voltage conversion module b72
  • the output terminal is connected to the controller.
  • the third isolation voltage conversion module b73 is configured to receive the power supply signal, and by performing voltage conversion on the power supply signal, the third isolation voltage conversion module b73 generates a negative reference signal;
  • the coil winding module b71 and the second isolation voltage conversion module b72 are coupled and connected, and the coil winding module b71 is connected to the controller.
  • the coil winding module b71 is used to receive the power supply signal and the third isolation voltage conversion module b73 generates a negative reference signal, which is coupled to obtain a negative reference signal.
  • the power supply signal in this embodiment may be a mains AC signal or a signal after processing the mains AC signal.
  • mains AC signal processing process For a specific mains AC signal processing process, refer to FIG. 28.
  • a negative power supply signal and a negative reference signal can be output to the controller, so that the controller can drive the lamp area to work by a negative pressure drive, and can also provide a positive power supply signal for the controller to control ⁇ Work.
  • the power supply circuit structure in the display device has two different connection modes as shown in FIG. 27 and FIG. 29.
  • FIG. 30 is a schematic structural diagram of a fourth power supply provided in an embodiment of the application.
  • the power supply structure of the present application is applicable to the first power supply in FIG. 23.
  • the first power supply includes: a step-down module b81, a first voltage conversion module b82, and a second voltage conversion module b83.
  • the first voltage conversion module b82 is used to perform voltage conversion on the received power supply signal to obtain a positive power supply signal, and send the positive power supply signal to the controller connected to its output terminal to supply power to the controller.
  • the second voltage conversion module b83 is used to perform voltage conversion on the received power supply signal to obtain a negative reference signal, and send the negative reference signal to the controller connected to the controller and the step-down module b81.
  • the first input terminal of the step-down module b81 is connected to the second voltage conversion module b83, the second input terminal of the step-down module b81 is grounded, and the step-down module b81 is used to output negative power supply based on the negative reference signal generated by the second voltage conversion module b83
  • the negative power supply signal is output to the controller connected to it; the negative power supply signal and the negative reference signal are used to provide the controller to generate a driving signal to drive the lamp zone to work, and the step-down module b81 can pass some step-down Circuit implementation, for example, a DC-DC converter such as a Buck circuit can also be implemented by a low dropout regulator (Low Dropout Regulator, LDO for short).
  • FIG. 31 is a schematic structural diagram of a fifth power supply provided by an embodiment of the application.
  • the power supply structure of the present application is applicable to the second power supply in FIG. 23.
  • the second power supply includes: a step-down module b91 and a third voltage conversion module b92;
  • the third voltage conversion module b92 is used to receive the power supply signal, perform voltage conversion on the power supply signal to obtain a negative reference signal, and provide it to the step-down module b91 connected to it;
  • the first input terminal of the step-down module b91 is connected to the third voltage conversion module b92, the second input terminal of the step-down module is grounded, and the step-down module b91 is used to output a negative power supply signal based on the negative reference signal generated by the third voltage conversion module b92
  • the controller connected to the output terminal of the third voltage conversion module b92; wherein, the negative power supply signal and the negative reference signal are used to provide the controller to generate driving signals to drive the lamp area to work, and the step-down module b91 can pass some step-down Circuit implementation, for example, a DC-DC converter such as a Buck circuit can also be implemented by a low dropout regulator (Low Dropout Regulator, LDO for short).
  • LDO Low Dropout Regulator
  • FIG. 30 and Figure 31 there is provided another power supply mode for the controller in the negative pressure driving mode, that is, through a step-down circuit or a low-dropout linear regulator to provide the controller Power supply, and based on this power supply mode, the power supply in the display device has two different circuit connection modes as shown in FIG. 30 and FIG. 31.
  • this power supply method is suitable for when the negative reference voltage is set low enough, it can directly use the step-down circuit or the low-dropout linear regulator to perform the step-down operation to obtain the negative power supply signal.
  • the controller of the display device includes a main board, a microprocessor, and a plurality of constant current drive modules (for example, a plurality of integrated constant current chips, IC chips), wherein the microprocessor modules are connected to the main board respectively. It is connected with multiple constant current drive modules to analyze the control signal transmitted from the main board and send the resolved control signal to multiple constant current drive modules, and the microprocessor module is also connected to any one of the multiple power supplies. Connect so that any power source supplies power to it.
  • a plurality of constant current drive modules are connected to their corresponding power supplies, and the constant current drive modules are provided with a negative reference signal and a negative power supply signal based on the negative reference signals through the power supply; and the constant current drive modules are also connected to the negative terminal of the corresponding lamp area, It is used to provide driving signals for the corresponding lamp areas, wherein a plurality of constant current driving modules are connected to the plurality of lamp areas in a one-to-one correspondence. That is, the constant current driving module receives the negative reference signal and the negative power supply signal, and provides the driving signal to the corresponding lamp area according to the control signal, the negative reference signal and the negative power supply signal analyzed by the microprocessor.
  • the reference ground of the main board is the earth
  • the reference ground of the constant current driving module in the light-emitting drive module is the negative reference signal generated by the corresponding power supply
  • FIG. 32 is a schematic structural diagram of an isolation mode in a negative voltage drive mode provided by an embodiment of the application (take two power supplies, power supply a and power supply b as an example, where power supply a is the first power supply and power supply b is the second power supply) .
  • the reference ground of the microprocessor is the negative reference signal generated by the power supply
  • the reference ground of the main board is the earth, it is necessary to set the first isolation module between the main board and the light-emitting drive module, that is, the main board and the light-emitting drive module.
  • the microprocessors are connected through the first isolation module.
  • the first isolation module is used to perform level conversion on the control signal generated by the main board, and send the obtained control signal to the microprocessor for analysis, ensuring that the signal between the main board and the microprocessor can be transmitted normally, and avoiding the The different reference grounds cause interference between the signals and cannot be transmitted normally.
  • capacitive isolation devices or magnetic isolation devices can be used to isolate the two reference grounds, while for low-frequency signals (such as Chip select signal), can be realized directly through a non-isolated level conversion circuit.
  • the output signal of the main board is connected to the input end of the isolation device and the level conversion circuit in the first isolation module, respectively, and the output end of the isolation device and the level conversion circuit in the first isolation module is connected to the micro processor.
  • Adapter module connection when connecting, the output signal of the main board is connected to the input end of the isolation device and the level conversion circuit in the first isolation module, respectively, and the output end of the isolation device and the level conversion circuit in the first isolation module is connected to the micro processor.
  • Adapter module connection when connecting, the output signal of the main board is connected to the input end of the isolation device and the level conversion circuit in the first isolation module, respectively, and the output end of the isolation device and the level conversion circuit in the first isolation module is connected to the micro processor.
  • IC chip a is connected to the negative terminal of the light area a
  • the IC chip b is connected to the negative terminal of the light area b
  • the positive terminals of the light area a and the light area b are both grounded.
  • Fig. 32 does not show the connection mode of the light area a and the light area b.
  • FIG. 33 is a schematic structural diagram of another isolation mode in a negative voltage driving mode provided by an embodiment of the application (taking two power supplies as an example, the two power supplies are power a and power b, and power a Corresponding to light area a and light area b) with power b).
  • the microprocessor is grounded to analyze the control signal generated by the main board;
  • the isolation module is used to perform level conversion on the control signal analyzed by the microprocessor, and send the converted control signal to the corresponding constant current drive module, and there is a one-to-one correspondence between the second isolation module and the constant current drive module.
  • the constant current driving module receives the negative reference signal and the negative power supply signal, and provides a driving signal to the corresponding lamp area according to the converted control signal, the negative reference signal and the negative power supply signal.
  • the input ends of the two second isolation modules can be connected to the microprocessor, and the output ends of the two second isolation modules are respectively connected to the input ends of their corresponding constant current drive modules (that is, connected to IC chip a, IC chip a, IC In chip b), the two second isolation modules perform level conversion on the signals parsed by the microprocessor and send them to their corresponding constant current drive modules.
  • the power supply a and the power supply b provide respective negative reference signals and a negative power supply signal based on the respective negative reference signals for the IC chip a and the IC chip b, respectively.
  • capacitive isolation devices or magnetic isolation devices can be used to isolate the two reference grounds, while for low-frequency signals (such as chip select signals) , It can be realized directly through a non-isolated level conversion circuit.
  • the devices shown in Fig. 32 and Fig. 33 are respectively structural schematic diagrams of two different isolation modes in the negative pressure driving mode provided by this application. Through these two different isolation modes, it is possible to ensure that signals can be carried out between different reference grounds. Transmission, to avoid electromagnetic interference of the signal due to different reference grounds.
  • the above-mentioned display device further includes a plurality of switches, and there is a one-to-one correspondence between the power supply and the switches. And multiple power sources can also be connected through switches.
  • one connection method is: the power supply for the mainboard is used as the main power supply, and the remaining power supply can be connected to the filter module in the main power supply through the corresponding switch, and the switch can be used to perform the switch instruction signal. Control, the specific switch control signal is sent by the main board.
  • FIG. 34 is a schematic circuit diagram of a backlight module driven by a negative voltage under the control of multiple power supplies according to an embodiment of the application. Take two power supplies as an example in Figure 34.
  • Power supply b1 provides a positive power supply signal for the main board. After the receiving module of power supply b2 is connected to the filter module of power supply b1 through a switching device, the switching device is turned on and off by a SW control signal. The SW control The signal is sent through the motherboard.
  • the power supply mode adopted by the power supply b1 is the same as that shown in FIG. 7 of the present application.
  • Both the power supply b1 and the power supply b2 are provided with a module for processing the AC power of the mains, but in FIG. 34, the power factor correction module and the voltage conversion module are integrated on a chip.
  • the power supply b1 also provides a negative reference signal and a negative power supply signal for the IC chip, and the power supply b2 provides a negative reference signal and a negative power supply signal for the IC chip.
  • Each IC chip is connected to a second isolation module corresponding to the second isolation module.
  • the module is connected with the microprocessor module, so that the microprocessor can analyze the control signal sent from the main board to the microprocessor and send it to the IC chip, and then the IC chip sends the negative power supply signal and negative reference signal to the corresponding light area according to the negative power supply signal and negative reference signal provided by the corresponding power supply. Send a drive signal to make the corresponding light zone light up.
  • the reference grounds of the three signals indicated by the reference signs b131, b132, and b133 are the same reference ground.
  • the reference grounds indicated by b134, b135, and b136 are the same reference ground, and the reference grounds of b131 and b134 are different.
  • the backplane can be a metal plate or an aluminum-plastic plate.
  • the aluminum-plastic plate because the intermediate structure of the aluminum-plastic plate is an insulating layer, when the light bar in the lamp area is grounded through the backplane, the problem of intermediate disconnection is likely to occur, resulting in the circuit in the entire backlight module
  • the connection is unstable, so you can add rivets or screws to the aluminum-plastic panel at this time, and connect the two sides of the aluminum-plastic panel with rivets or screws to ensure that the light area will not be disconnected when grounded through the backplane.
  • FIG. 35 is a schematic flowchart of a display control method provided by this application.
  • the method includes, step 101, determining whether it is currently in a standby mode.
  • step 102a if it is currently in the standby mode, control the first power supply to work and control the second power supply to turn off.
  • step 102b if it is currently in the non-standby mode, control the first power supply and the second power supply to work.
  • the first power supply connected to the controller can be turned on first, so that the power supply can provide a positive power supply signal to the main board.
  • the controller can receive a user's control instruction for the display device to determine whether the current display device is in the standby mode. For example, the controller can receive the user's operation of the power button on the display device and the operation of the start button of the display device. If the user turns on the power button of the display device, but the display device is not started, it indicates that the current display device is in standby mode; After the power button, continue to use the button to start the display device, it indicates that the current display device is in a non-standby mode.
  • the controller controls the working state of the power supply in the display device. That is, when the display device is currently in the standby mode, the controller can control the second power supply to turn off while the first power supply continues to work; when the display device is currently in the non-standby mode, the controller can control the first power supply and the second power supply to work simultaneously .
  • each power supply can be provided with a switch device, and the switch device can be used to receive a switch control signal sent by the controller to control the power supply to start or stop working.
  • the switch device can be used to receive a switch control signal sent by the controller to control the power supply to start or stop working.
  • the controller by controlling the turning on and off of the power supply in the display device in standby and non-standby modes by the controller, the power consumption of the display device and the loss of the display device can be reduced, and the service life of the display device can be prolonged.
  • the negative power supply signal and the negative reference signal provided by the multiple power supplies are also matched with the power of the light-emitting element in the corresponding lamp area; that is, before step 101, the light-emitting elements of the same power need to belong to the same light area. According to the rules, all the light-emitting elements of the backlight module are divided to obtain multiple light areas.

Abstract

一种显示装置及显示控制方法，显示装置包括背光模块以及显示面板。背光模块包括控制器、多个电源以及与多个电源对应的灯区，且多个电源中，包括为控制器提供正供电信号以及驱动灯区的第一电源，和驱动灯区的第二电源。并且，背光模块中的控制器通过第一电源供电，此外灯区依据电源产生的负参考信号和负供电信号为电源所对应的灯区发送驱动信号，使得灯区在负压驱动的方式下工作。此外，第一电源与第二电源的工作状态可控。通过多个电源供电的显示装置，对于单个电源来说无需负担过多的发光元件，即可完成对背光模块整个灯区的负压驱动，从而避免灯区较大时，背光模块无法提供所需功率而最终导致图像失真等问题。

Description

显示装置及显示控制方法
[根据细则91更正 27.04.2021]　
本申请要求于2020年03月18日提交的申请号为202010192086.8、名称为“显示装置及供电电路”；于2021年02月01日提交的申请号为202110137510.3、名称为“显示装置及供电电路”；于2021年02月01日提交的申请号为202110138504.X、名称为“显示装置及负压阶梯供电电路”；于2021年02月07日提交的申请号为202110177726.2、名称为“显示装置及显示控制方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及显示技术领域，尤其涉及一种显示装置及显示控制方法。
背景技术
目前，随着电子技术的发展，包括电视机等显示装置在内的电子设备的集成度越来越高，也就对显示装置的电源提出了越来越高的要求。目前大部分显示装置通过插头接收市电交流电后，采用专门的供电电路对交流电进行转直流、变压等操作后为显示装置内的负载供电。
相关技术中已经公开阶梯供电的供电电路，一些可能实现方式中，供电电路中为至少一路LED灯条设置的电压调整模块的电压应力较大，导致了电压调整模块占用供电电路所在印刷电路板(Printed Circuit Board，简称：PCB)板的面积较大，使得供电电路的成本较高；另一些可能实现方式中，由于多个LED驱动组件以及所连接的电压调整模块无法并联使用，从而需要在LLC模块内增加绕组或者二极管的方式来实现阶梯供电的技术问题，导致了供电电路的结构较为复杂。
发明内容
本申请提供了一种显示装置及显示控制方法，通过上述方法解决了相关技术的显示装置中，电路复杂问题。
本申请提供一种显示装置，包括：显示屏幕，被配置为显示图像画面；声音再现装置，被配置为播放声音；至少一路发光二极管LED灯条，被配置为点亮所述显示屏幕；供电电路，被配置为向所述显示装置的负载供电，所述负载至少包括所述显示屏幕、所述声音再现装置及所述至少一路LED灯条；
所述供电电路包括LLC原边绕组、第一谐振变换器LLC副边绕组和第二LLC副边绕组，所述第一LLC副边绕组用于将所述LLC原边绕组的电压转换为第一电压后，向所述至少一路LED灯条输出，所述第二LLC副边绕组用于将所述LLC原边绕组的电压转换为第二电压后，向所述至少一路LED灯条输出；所述供电电路具体被配置为，对所述第一LLC副边绕组输出的第一电压调整为第三电压，并通过所述第三电压与所述第二电压之和为所述至少一路LED灯条供电。
在一些实施例中，LED灯条的数量是多路；所述供电电路还包括：电压调整模块和电压驱动模块；
所述第二LLC副边绕组的输出端连接所述第一LLC副边绕组的输入端，所述第一LLC副边绕组的输入端和输出端连接所述电压调整模块，所述电压调整模块连接所述电压驱动模块；
所述第一LLC副边绕组用于输出第一电压，所述第二LLC副边绕组用于输出第二电压；
所述电压调整模块用于将所述第一电压调整为第三电压，并将所述第三电压与所述第二电压之和发送至所述电压驱动模块；
所述电压驱动模块用于根据所述第三电压和所述第二电压之和分别为多路LED灯条供电。
在一些实施例中，所述电压驱动模块还用于，根据所述多路LED灯条的电流向所述电压调整模块发送反馈信号；所述反馈信号用于所述电压调整模块对所述第一电压进行调整；
所述电压调整模块具体用于，根据所述反馈信号，将所述第一电压调整为所述第三电压。
在一些实施例中，所述供电电路还包括：光耦，所述光耦分别与所述电压驱动模块和所述电压调整模块连接，所述光耦用于对所述电压驱动模块向所述电压调整模块发送反馈信号时进行光耦隔离。
在一些实施例中，LED灯条的数量是多路；所述供电电路还包括：电压调整模块和电压驱动模块；
所述第一LLC副边绕组的输出端通过所述电压调整模块连接所述第二LLC副边绕组的输入端，所述第二LLC副边绕组的输出端连接所述电压驱动模块；
所述第一LLC副边绕组用于输出第一电压，所述第二LLC副边绕组用于输出第二电压；
所述电压调整模块用于将所述第一电压调整为第三电压，并将所述第三电压发送至所述第二LLC副边绕组，所述第二LLC副边绕组用于将所述第三电压与所述第二电压之和发送至所述电压驱动模块；
所述电压驱动模块用于根据所述第三电压和所述第二电压之和分别为多路LED灯条供电。
在一些实施例中，所述供电电路还包括：电压调整模块；所述至少一路LED灯条分别各自连接一个电压调整模块；
所述第二LLC副边绕组的输出端连接所述第一LLC副边绕组的输入端，所述第一LLC副边绕组的输出端分别连接所述至少一路LED灯条中每一路LED灯条的输入端，所述每一路LED灯条的输出端分别连接一个电压调整模块的输入端，每个所述电压调整模块的输出端均连接所述第一LLC副边绕组的输入端；
所述第一LLC副边绕组用于输出第一电压，所述第二LLC副边绕组用于输出第二电压；
每个所述电压调整模块用于将所述第一电压调整为第三电压，并根据所述第三电压与所述第二电压之和为所述电压调整模块所连接的一路LED灯条供电。
在本申请第一方面一实施例中，所述供电电路还包括：电压调整模块；所述至少一路LED灯条分别各自连接一个第二LLC副边绕组和电压调整模块；
对于所述至少一路LED灯条中的每一路LED灯条，所述第一LLC副边绕组的输出端连接所述电压调整模块的输出端，所述第二LLC副边绕组的输入端连接所述电压调整模块的输入端，所述第二LLC副边绕组的输出端连接所述LED灯条的输入端；
所述第一LLC副边绕组用于输出第一电压，所述第二LLC副边绕组用于输出第二电压；
每个所述电压调整模块用于将所述第一电压调整为第三电压，并根据所述第三电压与所述第二电压之和为所述电压调整模块所连接的一路LED灯条供电。
在一些实施例中，所述第一LLC副边绕组的输出电压还用于向所述显示装置的主板供电。
在一些实施例中，所述第一LLC副边绕组和所述第二LLC副边绕组是所述供电电路中LLC模块的副边绕组；或者，
所述第一LLC副边绕组和所述第二LLC副边绕组是所述供电电路中反激电压变换模块的副边绕组。
本申请还提供一种供电电路，所述供电电路可以是如本申请第一方面任一项所述的显示装置中的供电电路，例如，所述供电电路可以包括：LLC原边绕组、第一谐振变换器LLC副边绕组和第二LLC副边绕组，所述第一LLC副边绕组用于将所述LLC原边绕组的电压转换为第一电压后，向所述至少一路LED灯条输出，所述第二LLC副边绕组用于将所述LLC原边绕组的电压转换为第二电压后，向所述至少一路LED灯条输出；
所述供电电路具体被配置为，对所述第一LLC副边绕组输出的第一电压调整为第三电压，并通过所述第三电压与所述第二电压之和为所述至少一路LED灯条供电。
本申请实施方式还提供一种显示装置，包括：
显示屏，被配置为显示图像画面；多个LED驱动组件，每个LED驱动组件用于向所连接的多路发光二极管LED灯条供电，所述LED灯条被配置为点亮所述显示屏；供电电路，被配置为向所述多个LED驱动组件供电；其中，所述供电电路具体被配置为，生成第一电压和第二电压，并通过所述第一电压和所述第二电压同时为所述多个LED驱动组件供电。
在一些实施例中，所述供电电路具体被配置为，向所述多个LED驱动组件的正极提供正向的第一电压、向所述多个LED驱动组件的负极提供负向的第二电压。
在一些实施例中，，所述供电电路包括：LLC原边绕组，被配置为接收输入电压；
第一LLC副边绕组，所述第一LLC副边绕组的正极分别连接所述多个LED驱动组件的正极，所述第一LLC副边绕组的负极接地；所述第一LLC副边绕组被配置为将所述输入电压转换为第一电压后，向所述多个LED驱动组件的正极输出所述第一电压；所述第一LLC副边绕组的负极接地；
第二LLC副边绕组，所述第二LLC副边绕组的正极接地，所述第二LLC副边绕组的负极分别连接所述多个LED驱动组件的负极；所述第二LLC副边绕组被配置为将所述输入电压转换为第二电压后，向所述多个LED驱动组件的正极输出所述第二电压。
在一些实施例中，所述供电电路还包括：多个电压调整模块；每个所述第一LLC副边绕组的正极通过所述电压调整模块连接所述LED驱动组件的正极；
所述LED驱动组件被配置为，根据所连接的多路LED灯条的工作电压向所述电压调整模块发送反馈信号；所述电压调整模块被配置为，根据所述反馈信号，对向所述多路LED驱动组件输出的所述第一电压进行调整。
在一些实施例中，所述供电电路还包括：多个反馈电路，每个所述LED驱动组件通过一个所述反馈电路连接对应的所述电压调整模块；
所述反馈电路被配置为，接收所述LED驱动组件输出的第一反馈信号，将第一反馈信号转换为第二反馈信号后，向所述电压调整模块输出所述第二反馈信号；其中，所述第一反馈信号和所述第二反馈信号的参考地电平不同。
在一些实施例中，所述反馈电路包括：VI变换电路和DC-DC电压反馈电路；
所述VI变换电路用于将电压信号形式的所述第一反馈信号转换为电流信号形式的所述第二反馈信号并发送至所述DC-DC电压反馈电路；
所述DC-DC电压反馈电路用于接收并向所述电压调整模块发送所述第二反馈信号。
在一些实施例中，所述反馈电路包括：LED电压反馈电路、隔离电路和DC-DC电压反馈电路；
所述LED电压反馈电路用于，根据所述第一电压和所述第一反馈信号，生成第一中间信号；
所述隔离电路用于，接收所述第一中间信号，并生成隔离后的第二中间信号；
所述DC-DC电压反馈电路用于接收所述第二中间信号，根据所述第二中间信号生成第二反馈信号，并向所述电压调整模块发送所述第二反馈信号。
在一些实施例中，所述隔离电路包括：开关管；或者，光耦。
在一些实施例中，所述DC-DC电压反馈电路还包括：
前馈电路，用于提供前馈补偿；其中，所述前馈电路的第一端连接所述电压调整模块的输出端，所述前馈电路第二端连接所述电压调整模块的反馈输入端。
在一些实施例中，所述LED电压反馈电路还包括：稳压电路，设置在所述电压调整模块的输出端和所述基准电压源之间，用于对基准电压源进行保护。
本申请还提供一种负压阶梯供电电路，被配置为向多个LED驱动组件供电，包括：LLC原边绕组，被配置为接收输入电压；
第一LLC副边绕组，所述第一LLC副边绕组的正极分别连接所述多个LED驱动组件的正极，所述第一LLC副边绕组的负极接地；所述第一LLC副边绕组被配置为将所述输入电压转换为第一电压后，向所述多个LED驱动组件的正极输出所述第一电压；所述第一LLC副边绕组的负极接地；
第二LLC副边绕组，所述第二LLC副边绕组的正极接地，所述第二LLC副边绕组的负极分别连接所述多个LED驱动组件的负极；所述第二LLC副边绕组被配置为将所述输入电压转换为第二电压后，向所述多个LED驱动组件的正极输出所述第二电压；
多个电压调整模块，所述第一LLC副边绕组的正极通过所述电压调整模块连接对应的所述LED驱动组件的正极；所述LED驱动组件被配置为，根据所连接的多路LED灯条的工作电压向所述电压调整模块发送反馈信号；所述电压调整模块被配置为，根据所述反馈信号，对向所述多路LED驱动组件输出的所述第一电压进行调整。
多个反馈电路，每个所述LED驱动组件通过一个所述反馈电路连接对应的所述电压调整模块；所述反馈电路被配置为，接收所述LED驱动组件输出的第一反馈信号，将第一反馈信号转换为第二反馈信号后，向所述电压调整模块输出所述第二反馈信号；其中，所述第一反馈信号和所述第二反馈信号的参考地电平不同。
本申请提供一种显示装置，该显示装置中包括：背光模块和显示面板；其中，背光模块中包括多个电源、控制器、以及和多个电源对应的灯区；多个电源和多个灯区连接通过控制器连接；多个电源中包括两类电源，即用于向控制器提供正供电信号以及驱动灯区的第一电源，和用于驱动灯区的第二电源；控制器基于接收的控制信号、以及多个电源输出负供电信号和负参考信号，采用负压驱动的方式输出驱动信号，驱动被选择的电源对应的灯区发光，之后灯区通过将光投射至显示面板，为显示面板提供背光；其中，控制器在待机模式下控制第一电源工作以及控制第二电源关闭，并在非待机模式下控制第一电源和第二电源工作。
在一些实施例中，第二电源的一种结构为，第二电源包括：线圈绕组模块和第一隔离电压变换模块；线圈绕组模块与第一隔离电压变换模块耦合，且线圈绕组模块通过控制器与灯区连接；第一隔离电压变换模块用于接收供电信号，进行电压变换后输出负参考信号；线圈绕组模块接收供电信号和负参考信号，耦合获得负供电信号；其中，负供电信号和负参考信号用于提供给控制器生成驱动信号。
在一些实施例中，第一电源的一种结构为，包括：线圈绕组模块、第二隔离电压变换模块和第三隔离电压变换模块；第二隔离电压变换模块接收供电信号，第二隔离电压变换模块的输出端与控制器连接；线圈绕组模块与第二隔离电压变换模块耦合连接，且线圈绕组模块通过控制器与灯区连接；其中，第三隔离电压变换模块接收供电信号；第二隔离电压变换模块用于对供电信号进行电压变换，获得正供电信号并提供给控制器；第三隔离电压变换模块用于对供电信号进行电压变换，获得负参考信号；线圈绕组模块用于接收供电信号和负参考信号，耦合获得负供电信号；其中，负供电信号和负参考信号用于提供给控制器生成驱动信号。
在一些实施例中，第一电源的另一种结构为，第一电源包括：降压模块、第一电压变换模块和第二电压变换模块；第一电压变换模块接收供电信号，第一电压变换模块的输出端与控制器连接；第二电压变换模块接收供电信号；降压模块的第一输入端与第二电压变换模块连接，降压模块的第二输入端接地，降压模块的输出端通过控制器与灯区连接；第一电压变换模块对供电信号进行电压变换，获得正供电信号，正供电信号用于提供给控制器；第二电压变换模块对供电信号进行电压变换，获得负参考信号；降压模块基于第二电压变换模块产生的负参考信号输出负供电信号；其中，负供电信号和负参考信号用于提供给控制器生成驱动信号。
在一些实施例中，第二电源的另一种结构为，第二电源包括：降压模块和第三电压变换模块；第三电压变换模块接收供电信号；降压模块的第一输入端与第三电压变换模块连接，降压模块的第二输入端接地，降压模块的输出端通过控制器与灯区连接；第三电压变换模块，用于对供电信号进行电压变换，获得负参考信号；降压模块，用于基于第三电压变换模块产生的负参考信号输出负供电信号；其中，负供电信号和负参考信号用于提供给控制器生成驱动信号。
在一些实施例中，控制器包括：主板、微处理器、以及多个恒流驱动模块；主板 和微处理器之间连接有第一隔离模块；微处理器分别与第一电源和多个恒流驱动模块连接；多个电源与对应的恒流驱动模块连接；多个恒流驱动模块与多个灯区一一对应连接；第一隔离模块，用于对主板产生的控制信号进行电平转换，并将获得的控制信号发送给微处理器进行解析；恒流驱动模块接收负参考信号和负供电信号，并依据微处理器解析的控制信号、负参考信号和负供电信号，生成并向对应的灯区提供驱动信号。
在一些实施例中，控制器包括：主板、与主板连接的微处理器、以及多个恒流驱动模块；装置还包括多个第二隔离模块，多个第二隔离模块与多个恒流驱动模块一一对应；多个恒流驱动模块通过对应的第二隔离模块与微处理器连接；微处理器接地，用于对主板产生的控制信号进行解析；第二隔离模块，用于对微处理器解析后的控制信号进行电平转换，并将转换后的控制信号发送给对应的恒流驱动模块；恒流驱动模块接收负参考信号和负供电信号，并依据转换后的控制信号、负参考信号和负供电信号，生成并向对应的灯区提供驱动信号。
在一些实施例中，装置还包括背板；多个灯区的高电平端均通过背板接地。
本申请提供了一种显示控制方法，控制方法包括：确定当前是否处于待机模式；若当前处于待机模式，则控制第一电源工作并控制第二电源关闭；若当前处于非待机模式，则控制第一电源和第二电源工作。
在一些实施例中，多个电源提供的负供电信号和负参考信号与对应的灯区内发光元件的功率匹配；确定当前是否处于待机模式之前，还包括：按照相同功率的发光元件属于同一灯区的规则，对所述背光模块的所有发光元件进行划分，获得多个灯区。
本申请提供的显示装置，通过采用多电源供电的背光模块为显示面板提供背光，即本申请中的背光模块包括多个电源，这些电源分别对应不同的灯区。且多个电源中，包括为控制器提供正供电信号以及驱动灯区的第一电源，以及仅用于驱动灯区的第二电源。当背光模块工作时，背光模块中的控制器通过上述多个电源中的第一电源供电，灯区依据不同电源产生的负参考信号和第一电源和第二电源提供的供电信号为电源所对应的灯区发送驱动信号，使得灯区在负压驱动的方式下发出光线。并且，在待机模式下，控制器控制第一电源工作，第二电源关闭；在非待机模式下，第一电源与第二电源均处于工作的状态。通过上述多电源供电的显示装置，即背光模块采用多电源供电，对单个电源来说无需负担过多的发光元件，即可完成对背光模块整个灯区的驱动，从而避免当背光模块中灯区较大时，背光模块无法提供所需功率而最终导致例如显示面板所显示的图像失真等问题。
附图说明
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本申请的实施例，并与说明书一起用于解释本申请的原理。
为了更清楚地说明本申请实施例或相关技术中的技术方案，下面将对实施例或相关技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为设有独立电源板的显示装置的结构示意图；
图2为电源板与负载的连接关系示意图；
图3为电视电源架构示意图；
图4示出了一种为主板以及LED灯条供电的供电电路结构示意图；
图5为本申请一实施例提供的显示装置的供电电路的结构示意图；
图6为本申请一实施例提供的显示装置的供电电路的结构示意图；
图7为本申请一实施例提供的显示装置的供电电路的结构示意图；
图8为本申请一实施例提供的显示装置的供电电路的结构示意图；
图9为相关技术中一种显示装置的供电电路的结构示意图；
图10为本申请一实施例提供的显示装置的供电电路的结构示意图；
图11为本申请LED灯条电压范围的示意图；
图12为本申请一实施例提供的显示装置的供电电路的结构示意图；
图13为本申请一实施例提供的显示装置的供电电路的结构示意图；
图14为相关技术中一种显示装置的供电电路的结构示意图；
图15为本申请一实施例提供的显示装置的供电电路的结构示意图；
图16为本申请一实施例提供的显示装置的供电电路的结构示意图；
图17为本申请提供的显示装置的示意图；
图18为本申请提供的反馈电路一实施例的结构示意图；
图19为本申请提供的反馈电路的电路结构示意图；
图20为本申请提供的反馈电路另一实施例的结构示意图；
图21为本申请提供的反馈电路的电路结构一实施例示意图；
图22为本申请提供的反馈电路的电路结构另一实施例示意图；
图23为本申请提供实施例的一种显示装置的结构示意图；
图24为本申请实施例提供的一种背光模块的结构示意图；
图25为本申请实施例提供的一种灯区电流流向示意图；
图26为本申请实施例提供的另一种灯区电流流向示意图；
图27为本申请实施例提供的一种电源的结构示意图；
图28为本申请实施例提供的第二种电源的结构示意图；
图29为本申请实施例提供了第三种电源的结构示意图；
图30为本申请实施例提供了第四种电源的结构示意图；
图31为本申请实施例提供了第五种电源的结构示意图；
图32为本申请实施例提供的一种负压驱动模式下的隔离方式结构示意图；
图33为本申请实施例提供的另一种负压驱动模式下的隔离方式的结构示意图；
图34为本申请实施例提供的一种多电源控制下的负压驱动的背光模块的电路示意图；
图35为本申请提供的一种显示控制方法的流程示意图。
通过上述附图，已示出本申请明确的实施例，后文中将有更详细的描述。这些附图和文字描述并不是为了通过任何方式限制本申请构思的范围，而是通过参考特定实施例为本领域技术人员说明本申请的概念。
具体实施方式
这里将详细地对示例性实施例进行说明，其示例表示在附图中。下面的描述涉及附图时，除非另有表示，不同附图中的相同数字表示相同或相似的要素。以下示例性实施例中所描述的实施方式并不代表与本申请相一致的所有实施方式。相反，它们仅是与如所附权利要求书中所详述的、本申请的一些方面相一致的装置和方法的例子。
下面对本申请所涉及的应用场景以及相关技术中所存在的问题进行说明。
目前，为了方便人们获取信息，各类电子产品的屏幕也越来越大，例如手机、电脑、电视等。然而，随着各类显示装置设置的显示面板越来越大，对应的在电子产品内部则需要增设更多的发光元件，并通过电源或者驱动装置为发光器件按照发光元件所需功率为其提供驱动信号，使得可以为发光器件可以为显示屏幕提供足够的光线，显示屏幕上可以清晰的显示用户所需的信息。
首先结合附图，对本申请所应用的场景以及所存在的问题进行说明。随着人们获取信息的需求不断加深，各种类型的显示装置应运而生，比如电脑、电视机以及投影仪等。供电电路是显示装置中最为重要的电路结构之一，供电电路可以为显示装置提供电能，从而使显示装置得以正常运行。有的显示装置设置有独立电源板，有的显示装置将电源板和主板合二为一。
以设置有独立电源板的显示装置为例，对显示装置的结构进行说明，参见图1所示，图1为设有独立电源板的显示装置的结构示意图，如图1所示，显示装置包括面板1、背光组件2、主板3、电源板4、后壳5和基座6。其中，面板1用于给用户呈现画面；背光组件2位于面板1的下方，通常是一些光学组件，用于供应充足的亮度与分布均匀的光源，使面板1能正常显示影像，背光组件2还包括背板20，主板3和电源板4设置于背板20上，通常在背板20上冲压形成一些凸包结构，主板3和电源板4通过螺钉或者挂钩固定在凸包上；后壳5盖设在面板1上，以隐藏背光组件2、主板3以及电源板4等显示装置的零部件，起到美观的效果；底座6，用于支撑显示装置。
在一些实施例中，图2为电源板与负载的连接关系示意图，如图2所示，电源板4包括输入端41和输出端42(图中示出第一输出端421、第二输出端422、第三输出端423)，其中，输入端41与市电相连，输出端42与负载相连，比如，第一输出端421和用于点亮显示屏幕的LED灯条相连，第二输出端422和音响相连，第三输出端423和主板相连。电源板4需要将交流市电转换为负载所需求的直流电，并且，该直流电通常具有不同的规格，例如音响需要18V，面板需要12V等。
具体地，以电视为例介绍显示装置的电源架构，图3为电视电源架构示意图，如图3所示，显示装置可以包括：供电电路1、负载2、控制电路3、电源4，其中，电源4包括：整流桥41、功率因数校正(Power Factor Correction，PFC)模块42和谐振变换器(LLC)模块43，LLC模块43中包括同步整流电路(图3未示出)。PFC模块42与LLC模块43连接，LLC模块43分别供电电路1、控制电路3相连。
其中，整流桥41用于对输入的交流电进行整流，向PFC模块42输入全波信号。PFC模块42主要对输入的交流电源进行功率因数校正，向LLC模块43输出稳定的直流母线电压(如380V)。PFC模块41可以有效提高电源的功率因数，保证电压和电流同相位。LLC模块43通常包括同步整流电路、脉冲频率调整(Pulse frequency modulation，PFM)电路、电容以及电感等元器件。LLC模块43具体可以对PFC模块42输入的直流母线电压进行降 压或升压，并输出恒定的电压给负载2。电源4还可以包括反激模块(图3未示出)，用于向PFC模块42和LLC模块43提供自身的供电电压和待机电源。
控制电路3分别与电源4、供电电路1相连，能够控制供电电路1是否导通，即控制LLC模块43输出的电能能否经过供电电路为负载2供电，从而实现负载的开启或关闭。供电电路1还与LLC模块、负载相连，当供电电路1连通时，LLC模块43能够为负载2供电，当供电电路1断开时，LLC模块43不能够为负载2供电。负载2包括主板21、背光组件22、显示主体23等。
在一些实施例中，以显示装置为电视机为例，图4示出了一种为主板以及LED灯条供电的供电电路结构示意图，其中，在供电电路所获取的市电交流电(100V-240V，50-60Hz)依次通过滤波整流模块(整流桥)、PFC模块和LLC模块后，向显示装置的主板、多路LED灯条以及其他负载供电，其他负载在图4中未示出。
由于所需的电压范围与多路LED灯条的工作环境、LED组件的硬件特性、寿命等因素有关，多路LED灯条所需的电压存在一定的变动范围，且变动范围有限。因此LLC模块中为多路LED灯条供电的副边绕组还额外连接一个电压调整模块(例如buck电路或者boost电路，图4中以boost电路为例)和电压驱动模块，电压调整模块能够根据多路LED灯条的实时电流反馈结果，对副边绕组直接输出的电压进行调整后传输至电压驱动模块，使得电压驱动模块根据接收到的电压控制多路LED灯条以额定电流工作，防止过大电流流过多路LED灯条中的LED组件造成元件的损坏。但是，在如图4所示的供电电路中，供电电路中为多路LED灯条设置的电压调整模块的电压应力较大，导致了电压调整模块中开关管、电容等元件的耐压值较高，进而占用供电电路所在PCB板的面积较大，最终增加了供电电路的成本。
因此，本申请提供一种显示装置及供电电路，能够通过灵活设置两个不同的副边绕组输出的电压范围，使得电压调整模块只需要对其中一个副边绕组输出的电压进行调整，从而降低了对电压调整模块中开关管、电容等元件的耐压值的要求，进而减少了供电电路所在PCB板的面积，最终降低了供电电路的成本。
下面以具体地实施例对本申请的技术方案进行详细说明。下面这几个具体的实施例可以相互结合，对于相同或相似的概念或过程可能在某些实施例不再赘述。
图5为本申请一实施例提供的显示装置的供电电路的结构示意图，如图5所示，供电电路包括：电源11，滤波整流模块12，PFC模块13，LLC模块14和负载。其中，所述负载至少包括图中示出的主板18和多路LED灯条。
本实施例提供的供电电路的LLC模块14通过原边绕组141接收PFC模块13发送的直流电压后，不同的副边绕组根据原边绕组141的电压输出不同电压向不同的负载供电，例如，副边绕组144根据原边绕组141的电压向主板18输出提供12V的电压，副边绕组145根据原边绕组141的电压向主板18输出提供16V的电压。
在本实施例中，LLC模块14中设置了两个不同的LLC副边绕组为多路LED灯条供电，包括：第一LLC副边绕组142和第二LLC副边绕组143；其中，第一副边绕组142的输出端a输出第一电压，第二副边绕组143的输出端c输出第二电压；第二副边绕组143的输出端a连接第一副边绕组142的输入端b；同时，第一LLC副边绕组142的输入端b和输出端c都连接电压调整模块15，电压调整模块15可用于对第一LLC副边绕组142输出的第一电压进行调整，记经过电压调整模块15调整后的电压为第三电压，电压调整模块 15可以将第三电压，以及第二LLC副边绕组142输出的第二电压共同发送至电压驱动模块16，由电压驱动模块16根据第二电压和第三电压之和为多路LED灯条供电。
此时，对于第二LLC副边绕组143所输出的第二电压相当于不会变化的“固定电压”，第一LLC副边绕组142所输出的第一电压相当于变化的“变化电压”，因此在固定的第二电压的基础上增加一个可以调整的变化电压输出，两个副边绕组输出的固定电压和变化电压共同为多路LED灯条供电，这种供电形式又可被称为“阶梯供电”。
在一些实施例中，第一LLC副边绕组输出的第一电压小于第二LLC副边绕组输出的第二电压。例如，若图5中的多路LED灯条为16路的LED灯条，每路灯条包括9颗LED组件的情况下，在120mA条件下，多路LED灯条所需的电压范围为51.3V-58.5V，总电流为1.92A。则对于采用buck结构实现的阶梯供电，可以将第二LLC副边绕组所输出的固定的第二电压设定为48V，将第一LLC副边绕组所输出的第一电压浮地输出设定为12V，经过电压调整模块调整的电压范围可设定为3.3V-10.5V。此时，对于该buck拓扑结构的DC-DC参数为：输入电压12V，输出电压范围3.3V-10.5V，输出电流1.92A。而对于采用boost结构实现的阶梯供电，可以将第二电压设定为40V，将第一电压浮地输出设定为10V，则对于该boost拓扑结构的DC-DC参数为：输入电压12V，输出电压范围11.3V-18.5V，输出电流1.92A。上述的buck拓扑和boost拓扑可以根据工程需要进行选择，例如，buck拓扑结构具有成本低的优势，但是输出电压范围较窄；而boost拓扑具有输出电压范围较宽的优势，但是其成本相对较高。
作为对比，在如图4所示的仅通过一个副边绕组进行调整后向多路LED灯条供电的boost拓扑结构的DC-DC参数为：输入电压45V，输出电压范围51.3V-58.5V，输出电流1.92A。明显地，本实施例提供供电电路由于能够通过灵活设置两个不同的副边绕组分别输出的两个不同的电压，而电压调整模块只需要对其中电压较小的一个副边绕组输出的电压进行调整，从而降低了对电压调整模块中开关管、电容等元件的耐压值的要求，进而减少了供电电路所在PCB板的面积，最终降低了供电电路的成本。
从DC-DC的转换效率进行衡量时，本实施例供电电路采用buck拓扑时的DC-DC损耗可以通过7V*1.92A*0.05/0.95+0.5V*1.92A＝1.67W计算，此时总效率为98.5％；而对于如图4所示的供电电路的DC-DC损耗可以通过55V*1.92A*0.05/0.95＝5.55W计算，此时总效率为95％；由此可见，本实施例的供电电路还将DC-DC的转换效率提升了3.5％。
在如图5所示的实施例中，电压驱动模块16还可以根据为多路LED灯条进行供电时，多路LED灯条的实时电流向电压调整模块15发送反馈信号，使得电压调整模块15根据反馈信号对第一电压进行调整为新的第三电压，从而实现电压调整模块对电压进行的及时、有效的调整。
在一些实施例中，电压调整模块15和电压驱动模块16之间至少包括供电和反馈的两个连接关系，但是对于电压调整模块15在进行DC-DC调整时，其接地点与第二副边绕组的输出端连接，其电压值并不是接地的0V，而是相当于在第二副边绕组的输出电压值的基础上，对第一副边绕组的输出电压进行调整，因此，电压驱动模块16向电压调整模块发送的反馈信号还需要经过光耦17，从而通过光耦将反馈信号进行浮地电压的变换，将电压驱动模块向电压调整模块发送的反馈信号进行光耦隔离，使得光耦两侧电压调整模块15的浮地电压以及电压驱动模块16的实际接地电压统一，防止二者的相互影响。
图6为本申请一实施例提供的显示装置的供电电路的结构示意图，如图6所示的供电 电路与图5所示的供电电路都采用，设置两个不同的副边绕组分别输出的两个不同的电压，而电压调整模块只需要对其中电压较小的一个副边绕组输出的电压进行调整的思路实现。唯一的区别在于，图6所示实施例中供电电路采用单反激结构，所设置的第一副边绕组和第二副边绕组是通过单反激结构中的原边绕组输出电压，而图5所示实施例中所设置的第一副边绕组和第二副边绕组是通过基于LLC模块中的原边绕组输出电压。图6所示的其他模块以及供电电路的原理与图5所示实施例相同，不再赘述。
图7为本申请一实施例提供的显示装置的供电电路的结构示意图，其中，该供电电路同样可以应用在如图1-3任一项所述的显示装置中，如图7所示的供电电路中，在图5所示供电电路的基础上，将第一副边绕组的输出端连接第二副边绕组的输入端，并通过第二副边绕组的输出端给多路LED灯条供电，此时，对于电压调整模块所调整的第一副边绕组的输出电压，其输入端接地而不再浮地，因此在图7所示实施例中可以不设置光耦对反馈信号进行光耦隔离。
如图7所示的供电电路的LLC模块中设置了第一LLC副边绕组142和第二LLC副边绕组143；其中，第一副边绕组142的输入端a接地，第一副边绕组142的输出端b通过电压调整模块15连接第二副边绕组143的输入端c，第二LLC副边绕组143的输出端d连接所述电压驱动模块；其中，第一副边绕组142的输出端b用于输出第一电压，电压调整模块15可用于对第一LLC副边绕组142输出的第一电压进行调整，记经过电压调整模块15调整后的电压为第三电压，电压调整模块15可以将第三电压，并将第三电压发送至第二LLC副边绕组143的输入端c。第二LLC副边绕组143用于输出第二电压，对于第二LLC副边绕组143的输入端c相当于具有了浮地的第三电压，第二LLC副边绕组143的输出端d将第三电压与第二电压之和共同发送至电压驱动模块16，由电压驱动模块16根据第二电压和第三电压之和为多路LED灯条供电。
此时，对于第二LLC副边绕组143所输出的第二电压相当于不会变化的“固定电压”，第一LLC副边绕组142所输出的第一电压相当于变化的“变化电压”，因此在固定的第二电压的基础上增加一个可以调整的变化电压输出，两个副边绕组输出的固定电压和变化电压共同为多路LED灯条供电，这种供电形式又可被称为“阶梯供电”。可选地，第一LLC副边绕组输出的第一电压小于第二LLC副边绕组输出的第二电压。
因此，本实施例提供供电电路由于能够通过灵活设置两个不同的副边绕组分别输出的两个不同的电压，而电压调整模块只需要对其中电压较小的一个副边绕组输出的电压进行调整，从而降低了对电压调整模块中开关管、电容等元件的耐压值的要求，进而减少了供电电路所在PCB板的面积，最终降低了供电电路的成本。并且，本实施例不需要设置光耦，还降低了供电电路的复杂度，进一步降低了供电电路的成本。
图8为本申请一实施例提供的显示装置的供电电路的结构示意图，如图8所示的供电电路中，在图5所示供电电路的基础上，如果第一LLC副边绕组输出的第一电压所需变动范围可以在16V/18V时，则可以将为主板提供16V/18V电压的副边绕组作为所述第一LLC副边绕组，则此时不需要再单独设置第一LLC副边绕组，与图5所示实施例相比，能够进一步降低供电电路的复杂度，进而降低成本。可以理解的是，如图8所示仅以主板的16V/18V电压作为示例性说明，如果第一电压所需变动范围在12V以内时，可以将为主板提供12V电压的副边绕组作为所述第一LLC副边绕组；或者，在其他可能的实现中，还可以将为其他负载提供一定电压的副边绕组作为所示第一LLC副边绕组等，其实现方式与 原理相同，不再赘述。
在本申请前述实施例中，供电电路向多路LED灯条的驱动模块提供阶梯供电的电压，而在其他可能的实现场景中，供电电路还可以分别向至少一路LED灯条中的每一路LED灯条单独提供阶梯供电的电压，本申请一实施例以及之后的实施例中，将对这种应用场景进行说明。
图9为相关技术中一种显示装置的供电电路的结构示意图，其中，在供电电路所获取的市电交流电(100V-240V，50-60Hz)依次通过滤波整流模块(整流桥)、PFC模块和LLC模块后，向显示装置的主板、至少一路LED灯条，以及其他负载供电，图9中以至少一路LED灯条包括标号为①和②的两路LED灯条为例进行说明，其他负载在图9中未示出。其中，LLC模块中的第一个副边绕组向主板提供12V的电压，第二个副边绕组向主板提供18V的电压，第三个副边绕组向LED灯条①和②提供电压。与图4所示供电电路存在同样的理由，至少一路LED灯条中的每路LED灯条都需要以一定范围的压降工作以达到LED组件的额定电流，因此在图9的LED灯条①和②的输出端各自连接一个基于buck电路实现的电压调整模块，由电压调整模块对副边绕组输出至对应LED灯条的电压进行调整，使得LED灯条以额定电流工作，防止过大电流流过LED灯条中的LED组件造成元件的损坏。
但是，供电电路中每路LED灯条连接的电压调整模块的电压应力较大，例如当路LED灯条所需的电压范围为5.7V-6.5V时，电压调整模块需要对大于5V的电压进行升压或者降压的调整，导致了电压调整模块中开关管、电容等元件的耐压值较高，进而占用供电电路所在PCB板的面积较大，最终增加了供电电路的成本。
为了解决上述问题，图10为本申请一实施例提供的显示装置的供电电路的结构示意图，其中，供电电路包括：电源11，滤波整流模块12，PFC模块13，LLC模块14和负载。其中，所述负载至少包括图中示出的主板18和LED灯条①和LED灯条②，副边绕组144根据原边绕组141的电压向主板18输出提供12V的电压，副边绕组145根据原边绕组141的电压向主板18输出提供18V的电压。
在本实施例中，LLC模块14中设置了两个不同的LLC副边绕组为至少一路LED灯条供电，所述两个不同的LLC副边绕组包括：第一LLC副边绕组142和第二LLC副边绕组143；其中，第一副边绕组142的输入端a接地，第一副边绕组142的输出端b连接第二副边绕组143的输入端c，第二LLC副边绕组143的输出端d分别连接LED灯条①和②的正极；其中，第一副边绕组142的输出端b用于输出第一电压，则对于LED灯条①所连接的基于buck电路实现的电压调整模块15可用于对第一LLC副边绕组142输出的第一电压进行调整，记经过调整后的电压为第三电压，电压调整模块15可以将第三电压发送至第二副边绕组143输入端c。第二LLC副边绕组143用于输出第二电压，第二LLC副边绕组143的输出端d将第三电压与第二电压之和共同发送至LED灯条①供电。同样地，对于LED灯条②所连接的基于buck电路实现的电压调整模块16可用于对第一LLC副边绕组142输出的第一电压进行调整，记经过调整后的电压为第四电压，电压调整模块15可以将第四电压发送至第二副边绕组143输入端c。第二LLC副边绕组143用于输出第二电压，第二LLC副边绕组143的输出端d将第四电压与第二电压之和共同发送至LED灯条②供电。
对于第二LLC副边绕组143所输出的第二电压相当于不会变化的“固定电压”，第一 LLC副边绕组142所输出的第一电压相当于变化的“变化电压”，因此在固定的第二电压的基础上增加一个可以调整的变化电压输出，两个副边绕组输出的固定电压和变化电压共同为LED灯条供电，这种供电形式又可被称为“阶梯供电”。尤其是每路LED灯条都可以连接一个单独的电压调整模块，使得每个电压调整模块能够更加有效地调整其连接的LED灯条的电压。
如图10所示的实施例中以两路LED灯条为例作为示例性说明，在供电电路中还可包括其他任意数量的LED灯条，仅仅是简单的数量上的增减，原理相同不再赘述。
在一些实施例中，第一LLC副边绕组输出的第一电压小于第二LLC副边绕组输出的第二电压。而固定电压部分的电压加上变动电压部分的电压要大约LED灯条所需的整体电压降，否则电路将不能正常工作；同时，固定电压部分的电压电压降不能大于LED灯点亮所需要的最小电压，否则LED灯条则会不受控制的点亮。
例如，图11为本申请LED灯条电压范围的示意图，其中，显示装置中的LED灯条由于工艺制程的因素，在电流一定的情况下，压降会呈现一个范围。假设LED灯条的电压为6V，则其电压范围可以5.7～6.5V。因此，在本实施了中，为了实现对LED灯条的供电的输出电压范围达到5.7～6.5V，可以将第二副边绕组输出的固定的第二电压取为5.7V，将第一副边绕组输出的变动的第一电压去玩0.8V左右，此时LED灯条的电压降虽然不确定，但电流一定的情况下，不确定电压占总电压的比例不高。5.7V～6.5V的范围，变动电压只有0.8V，固定电压是5.7V，能够实现LED灯条驱动的需求。
因此，本实施例提供供电电路由于能够通过灵活设置两个不同的副边绕组分别输出的两个不同的电压，而电压调整模块只需要对其中电压较小的一个副边绕组输出的电压进行调整，从而降低了对电压调整模块中开关管、电容等元件的耐压值的要求，进而减少了供电电路所在PCB板的面积，最终降低了供电电路的成本。并且，本实施例不需要设置光耦，还降低了供电电路的复杂度，进一步降低了供电电路的成本。
图12为本申请一实施例提供的显示装置的供电电路的结构示意图，其中，如图12所示的供电电路与图10所示的供电电路都采用如下方案：设置两个不同的副边绕组分别输出的两个不同的电压共同为LED灯条供电，而电压调整模块只需要对其中电压较小的一个副边绕组输出的电压进行调整的思路实现。唯一的区别在于，图12所示实施例中供电电路采用单反激结构，所设置的第一副边绕组和第二副边绕组是通过单反激结构中的原边绕组输出电压，而图10所示实施例中所设置的第一副边绕组和第二副边绕组是通过基于LLC模块中的原边绕组输出电压。图12所示的其他模块以及供电电路的原理与图10所示实施例相同，不再赘述。
图13为本申请一实施例提供的显示装置的供电电路的结构示意图，其中，如图13所示的供电电路中，在图10所示供电电路的基础上，如果第一LLC副边绕组输出的第一电压所需变动范围可以在18V时，则可以将为主板提供18V电压的副边绕组作为所述第一LLC副边绕组，则此时不需要再单独设置第一LLC副边绕组，与图10所示实施例相比，能够进一步降低供电电路的复杂度，进而降低成本。可以理解的是，如图13所示仅以主板的18V电压作为示例性说明，如果第一电压所需变动范围在12V以内时，可以将为主板提供12V电压的副边绕组作为所述第一LLC副边绕组；或者，在其他可能的实现中，还可以将为其他负载提供一定电压的副边绕组作为所示第一LLC副边绕组等，其实现方式与原理相同，不再赘述。
图14为相关技术中一种显示装置的供电电路的结构示意图，其中，在前述实施例中，以基于buck电路实现的电压调整模块为例，而在其他可能的实现方式中，电压调整模块还可以基于boost电路实现。图14示出相关技术的供电电路中，LLC模块中的第一个副边绕组向主板提供12V的电压，第二个副边绕组向主板提供18V的电压，第三个副边绕组向LED灯条①和②提供电压。同样地，为了解决如图14所示的供电模块中，电压调整模块开关管、电容等元件的耐压值较高，进而占用供电电路所在PCB板的面积较大，最终增加了供电电路的成本的技术问题。
图15为本申请一实施例提供的显示装置的供电电路的结构示意图，其中，以供电电路为两路LED灯条①和②供电作为示例，则LLC模块14中设置了三个不同的LLC副边绕组为LED灯条①和②供电，包括：一个第一LLC副边绕组142，和两个第二LLC副边绕组143和146；其中，第一副边绕组142的输入端a接地，第一副边绕组142的输出端b连接电压调整模块15和电压调整模块16，第二LLC副边绕组143的输入端c连接电压调整模块15，输出端d连接LED灯条①，第二LLC副边绕组146的输入端e连接电压调整模块16，输出端f连接LED灯条②。可以理解的是，当供电电路为更多LED灯条供电时，可以为每个LED灯条分别设置一个第二副边绕组和电压调整模块，并按照图15中相同的方式连接，其实现方式与原理相同，不再赘述。
则对于LED灯条①所连接的基于boost电路实现的电压调整模块15可用于对第一LLC副边绕组142输出的第一电压进行调整，记经过调整后的电压为第三电压，电压调整模块15可以将第三电压发送至第二副边绕组143输入端c。第二LLC副边绕组143用于输出第二电压，第二LLC副边绕组143的输出端d将第三电压与第二电压之和共同发送至LED灯条①供电。同样地，对于LED灯条②所连接的基于boost电路实现的电压调整模块16可用于对第一LLC副边绕组142输出的第一电压进行调整，经过调整后的电压为第四电压，电压调整模块15可以将第四电压发送至第二副边绕组146的输入端e。第二LLC副边绕组146用于输出第五电压，第二LLC副边绕组143的输出端f将第四电压与第五电压之和共同发送至LED灯条②供电。
此时，对于第二LLC副边绕组143所输出的第二电压，以及第三LLC副边绕组146所输出对的第五电压相当于不会变化的“固定电压”，第一LLC副边绕组142所输出的第一电压相当于变化的“变化电压”，因此在固定的第二电压的基础上增加一个可以调整的变化电压输出，两个副边绕组输出的固定电压和变化电压共同为LED灯条供电，这种供电形式又可被称为“阶梯供电”。尤其是每路LED灯条都可以连接一个单独的电压调整模块，以及单独的LLC副边绕组，使得每个电压调整模块能够更加有效地调整其连接的LED灯条的电压。
在如图15所示的实施例的供电电路中，供电电路采用LLC模块进行供电，并在LLC模块中设置第一副边绕组、第二副边绕组和第三副边绕组，而在其他可能的实现方式中，供电电路还可以采用在单反激结构中设置的第一副边绕组和第二副边绕组，是通过单反激结构中的原边绕组输出电压。
图16为本申请一实施例提供的显示装置的供电电路的结构示意图，其中，如图16所示的供电电路中，在图15所示供电电路的基础上，如果第一LLC副边绕组输出的第一电压所需变动范围可以在18V时，则可以将为主板提供18V电压的副边绕组作为所述第一LLC副边绕组，则此时不需要再单独设置第一LLC副边绕组，与图15所示实施例相比， 能够进一步降低供电电路的复杂度，进而降低成本。可以理解的是，如图16所示仅以主板的18V电压作为示例性说明，如果第一电压所需变动范围在12V以内时，可以将为主板提供12V电压的副边绕组作为所述第一LLC副边绕组；或者，在其他可能的实现中，还可以将为其他负载提供一定电压的副边绕组作为所示第一LLC副边绕组等，其实现方式与原理相同，不再赘述。
在一些实施例中，由于电压转换电路无法并联使用，从而需要在LLC模块内增加绕组或者二极管的方式来实现阶梯供电的技术问题，导致了供电电路的结构较为复杂。因此，如下实施例提供解决方案。
本申请提供一种显示装置及负压阶梯供电电路，使得供电电路只需要在LLC模块中设置一个LLC副边绕组提供负向的电压，并结合另一个LLC副边绕组提供正向的第一电压，可以由两个LLC副边绕组通过并联的方式，同时为多个电压转换电路所连接的多路LED灯条的驱动组件提供电压，从而在多个电压转换电路能够连接同一个LLC副边绕组的输出，连接同一个负压接地点，实现多个电压转换电路在供电电路中的并联连接，并由LLC副边绕组同时向多路LED驱动供电，此时多个电压转换电路能够各自向所连接的LED驱动组件提供多路LED灯条所需的电流，不会完全依靠一个副边绕组提供全部大电流，使得副边绕组所输出的电流不会过大，且不需要设置更多的副边绕组的情况下就能够实现阶梯供电，能够简化供电电路的电路结构。
下面以具体地实施例对本申请的技术方案进行详细说明。下面这几个具体的实施例可以相互结合，对于相同或相似的概念或过程可能在某些实施例不再赘述。
图17为本申请提供的显示装置的示意图，
如图17所示的显示装置中提供的供电电路，可以为显示装置中多个LED驱动组件供电。图17中以LED驱动组件a161和LED驱动组件a162作为示例，则每个LED驱动组件可以用于向其所连接的多路LED灯条供电，所有LED驱动组件所连接的多路LED灯条可共同用于点亮显示装置的显示屏。
如图17所示的显示装置中，供电电路包括：插头a11、滤波整流模块a12、PFC模块A13和LLC模块a14，在其他可能的实现方式中，供电电路还可以根据不同的工况，包括上述全部或部分模块。则当供电电路从插头a11获取的市电交流电(100V-240V，50-60Hz)，市电交流电依次通过滤波整流模块a12(整流桥)、PFC模块A13和LLC模块A14的处理后，得到不同电压的直流电为负载供电。例如供电电路的LLC模块A14通过原边绕组a141接收PFC模块A13发送的直流输入电压后，副边绕组a143根据原边绕组a141的电压向主板a18提供电压为12V的电压，副边绕组a142根据原边绕组a141的电压向主板a18提供电压为18V的电压。上述12V和18V的电压仅为示例，副边绕组a142和副边绕组a143还可以分别向主板a18提供其他电压值的电压。
在本实施例提供的供电电路的LLC模块a14内，通过两个不同的副边绕组，同时向并联连接的多个驱动组件同时供电，记为第一LLC副边绕组和第二LLC副边绕组，其中，第一LLC副边绕组用于向多个LED驱动组件提供正向的第一电压，第二LLC副边绕组用于向多个LED驱动组件提供负向的第二电压。
在一些实施例中，上述提供正向第一电压的第一LLC副边绕组可以是上述副边绕组a143(第一电压为12V)和副边绕组a142(第一电压为18V)。如图17所示的示例中， 以第一LLC副边绕组为副边绕组a143作为示例，则第一LLC副边绕组的正极分别连接多个LED驱动组件的正极，即，第一LLC副边绕组a143的正极，同时与LED驱动组件a161的正极和LED驱动组件a162的正极连接，第一LLC副边绕组a143的负极接地，即第一LLC副边绕组以参考地为参考电平。
上述提供负向第二电压的可以是LLC模块A14中的第二LLC副边绕组a144，其中，第二LLC副边绕组的正极a接地，第二LLC副边绕组的负极b分别连接多个LED驱动组件的负极，即，第二LLC副边绕组的负极同时与LED驱动组件a161的负极和LED驱动组件a162的负极连接。则由于第二LLC副边绕组a144可用于将LLC原边绕组a141的输入电压转换为第二电压，因此第二LLC副边绕组a144的负极b此时相当于能够提供负向的第二电压。
同时，在如图17所示的实施例中，供电电路中还包括多个电压调整模块，每个LED驱动组件连接一个对应的电压调整模块，每个电压调整模块可用于对输出给LED组件的电压进行调整，所述电压调整模块可以通过buck或者boost结构实现，或者可以是DC-DC芯片。例如，LLC模块A14的第一LLC副边绕组通过电压调整模块a171连接LED驱动组件a161、通过电压调整模块172连接LED驱动组件a162。
结合上述供电电路中LLC模块A14的第一LLC副边绕组a143和第二LLC副边绕组a144，以LED驱动组件a161作为示例进行说明，当LLC模块A14的原边绕组a141接收到PFC模块A13发送的输入电压后，第一LLC副边绕组a143将输入电压转换为第一电压(记为VOUT)，并将第一电压通过电压调整模块a171输出给LED驱动组件a161的正极，第二LLC副边绕组a144将输入电压转换为第二电压记为(-VLED)，并将第二电压输出给LED驱动组件a161的负极，此时，对于LED驱动组件a161而言，相当于以负极的-VLED作为参考地电平，其两侧的电压为第一电压VOUT与第二电压-VLED的绝对值之和。由于第二LLC副边绕组a144输出的第二电压-VLED不会变化，记为“固定电压”，第一LLC副边绕组a143输出的第一电压可以由电压调整模块a171进行调整，记为“变化电压”，因此两个副边绕组输出的固定电压和变化电压共同为多路LED灯条供电，从而实现阶梯供电。
在一些实施例中，第一LLC副边绕组a143输出的第一电压VOUT小于第二LLC副边绕组输出的第二电压-VLED的绝对值。
LED驱动组件a161还可以确定其所连接的LED灯条的工作电压，并在工作电压变化时，向电压调整模块a171发送反馈信号，使得电压调整模块a171根据反馈信号，对其提供给LED驱动组件a161的电压进行调整，使得LED驱动组件a161能够驱动LED灯条保持其额定的正常工作电流。
综上，本实施例提供的供电电路，能够通过第一LLC副边绕组提供的正向的第一电压和第二LLC副边绕组提供的负向第二电压，同时为多个并联连接的电压转换电路以及LED驱动组件供电，从而在多个电压转换电路能够第一LLC副边绕组的正向输出端，连接第二LLC副边绕组提供-VLED的一端，实现多个电压转换电路在供电电路中的并联连接，并由LLC副边绕组同时向多路LED驱动供电，此时可以由多个电压转换电路各自向所连接的LED驱动组件提供多路LED灯条所需的电流，与如图5所示的实施例相比，使得每个副边绕组所输出的电流不会过大，能够降低电压转换电路的成本，与如图6所示的实施例相比，也不需要设置更多的副边绕组，所有电压转换电路可以共用第二LLC副边绕组，因此， 本实施例解决了如图5和图6所示实施例中存在的问题，能够通过成本较低、电路结构复杂度较低的电路结构实现阶梯供电。
在一些实施例中，在如图17所示的实施例中，对于每个LED驱动组件以及该LED驱动组件所连接的电压调整模块，由于LED驱动组件的参考地电平为-VLED，与电压调整模块直接连接的参考地不同，导致了LED驱动组件中恒流控制芯片所产生的反馈信号无法直接发送到电压调整模块，因此，本申请还提供一种反馈电路，设置如图17所示实施例中每个LED驱动组件和电压调整模块之间，用于接收LED驱动组件输出的第一反馈信号，将第一反馈信号进行转换后，得到电压调整模块对应的第二反馈信号，最终将第二反馈信号发送给电压调整模块。
具体地，图18为本申请提供的反馈电路一实施例的结构示意图，如图18所示的实施例中，以图17的供电电路中设置在LED驱动组件a161和电压调整模块a171之间的反馈电路a20作为示例。该反馈电路a20包括：VI变换电路和DC-DC电压反馈电路，其中，VI变换电路用于将LED驱动组件a161发送的电压信号形式的第一反馈信号，转换为DC-DC电压反馈电路对应的电流信号形式的第二反馈信号，并实现电平转换。DC-DC电压反馈电路用于接收并向电压调整模块a171发送第二反馈信号。
图19为本申请提供的反馈电路的电路结构示意图，示出了如图18所示结构的一种具体电路实现方式，其中，VI变换电路包括：运算放大器N1、三极管V1和第一电阻R4，运算放大器N1的第一输入端(可以是正极)连接LED驱动组件a161，运算放大器N1的第二输入端(可以是负极)连接三极管V1的第一端和第一电阻R4的第一端，运算放大器N1的输出端连接三极管V1的控制端，第一电阻R4的第二端连接第二LLC副边绕组的负极，使得VI变换电路的参考地电平为第二LLC副边绕组的负极的-VLED。
DC-DC反馈电路包括：第二电阻R1、第三电阻R2和第四电阻R3，第二电阻R1的第一端连接电压调整模块a171的输出端VOUT，第二电阻R1的第二端连接第三电阻R2的第一端、第四电阻R3的第一端和电压调整模块a171的反馈输入端，第四电阻R3的第二端连接三极管V1的第二端，第三电阻R2的第二端接地，使得DC-DC反馈电路连接参考地。
则当运算放大器N1接收到LED驱动组件a161发送的第一反馈信号FB，控制V1导通，使得DC-DC电压反馈电路上产生从VOUT到参考地，并流经第二电阻R1和第四电阻R3的电流信号，在第二电阻R1第二端的电流信号可以作为第二反馈信号，输入电压调整模块a171的反馈输入端，使得电压调整模块a171接收到第二反馈信号后，对其输出给LED驱动组件a161的电压VOUT进行调整。
但是，在如图18-图19所示的实施例中，由于LLC模组中提供固定电压的第一LLC副边绕组存在数kHz的电压波动，而完全依靠LED驱动组件中恒流控制芯片发出反馈信号的反馈速度较慢，可能会导致提供给LED灯条电压的高频波动，进而导致LED灯条工作电流的波动。
因此，为了克服上述副边绕组的电压波动问题，本申请还提供另一种反馈电路。图20为本申请提供的反馈电路另一实施例的结构示意图，如图20所示的反馈电路包括：LED电压反馈电路a203、隔离电路a204和DC-DC电压反馈电路a201。其中，DC-DC电压反馈电路a201连接参考地，LED电压反馈电路的参考地保持与LED驱动组件a161相同，均连接第二LLC副边绕组的负极，使得参考地电平为-VLED，隔离电路a204用于对其两 侧LED电压反馈电路a203和DC-DC电压反馈电路a201进行电气隔离。LED电压反馈电路用于根据第一电压VOUT和第一反馈信号，生成第一中间信号，并发送到隔离电路a204，隔离电路将第LED驱动组件a161的第一中间信号转换为第二中间信号输出到DC-DC电压反馈电路a201，使得DC-DC反馈电路能够根据第二中间信号生成第二反馈信号并发送到电压调整模块，同样能够解决两侧电路参考低电平不同的问题。
图21为本申请提供的反馈电路的电路结构一实施例示意图，示出了如图20所示结构的一种具体电路实现方式，其中，隔离电路a204可以是开关管T1，所述开关管T1可以是三极管、MOS管等。开关管T1的第一端连接电压调整模块a171的电压输出端VOUT，第二端连接DC-DC电压反馈电路a201，控制端连接LED电压反馈电路a203，使得开关管T1可以在LED电压反馈电路a203的控制下，通过导通和关闭传输信号实现隔离。
DC-DC电压反馈电路a201包括：第二电阻R1、第三电阻R2和第四电阻R3；第二电阻R1的第一端连接电压调整模块a171的电压输出端，第二电阻R1的第二端连接第三电阻R2的第一端、第四电阻R3的第一端和电压调整模块a171的反馈输入端，第四电阻R3的第二端连接开关管T1的第二端；第三电阻R的第二端接地，使得DC-DC反馈电路a201连接参考地。其中，DC-DC电压反馈电路a201可以单独实现对VOUT的反馈，则第二电阻的R1阻值应设置较大，以满足DC-DC输出电压可达到设定的电压输出最大值，并且第四电阻R3可以调整输出电压的最小值，或者，第四电阻R3的电阻值也可以为0R。
在一些实施例中，如图21所示的DC-DC电压反馈电路a201还可以包括：前馈电路，用于对整个DC-DC的环路进行前馈补偿。所述前馈电路包括第五电阻R11和第二电容C1，其中，第五电阻R11的第一端连接电压调整模块a171的电压输出端VOUT，第五电阻R11的第二端通过第二电容C11连接电压调整模块a171的反馈输入端。
LED电压反馈电路a203包括：基准电压源N1、第一分压电阻(图21中以R7和R8作为示例，可以是一个电阻)、第二分压电阻R9、偏置电阻R4和限流电阻R5；第一分压电阻的第一端R7连接电压调整模块a171的输出端VOUT，第一分压电阻的第二端R8连接第二分压电阻R9的第一端和基准电压源N1的控制端，基准电压源N1的第一端依次通过限流电阻R5的第一端、第二端和偏置电阻R4的第一端、第二端连接电压调整模块a171的输出端VOUT，偏置电阻R4的第一端和限流电阻R5的第二端连接开关管T1的控制端，基准电压源N1的第二端和第二分压电阻R9的第二端分别连接第二LLC副边绕组的负极，使得LED电压反馈电路a203的参考地电平为第二LLC副边绕组的负极的-VLED。
其中，所述基准电压源N1可以是TL431。LED电压反馈电路a203中的基准电压源N1、第一分压电阻(R7和R8)和第二分压电阻R9可以共同实现反馈，当VOUT变化时，VOUT在经过第一分压电阻和第二分压电阻的分压，控制基准电压源N1的导通和关闭。同时，LED驱动组件a161中恒流控制芯片产生的第一反馈信号也可以直接通过电阻R10发送到基准电压源N1的控制端。偏置电阻R4用于提供基准电压源N1的偏置电流，限流电阻R5用于限流，在LED电压反馈电路a203的整体电压值较大时，可以在电压调整模块a171的输出端VOUT和基准电压源N1之间增加稳压电路，例如稳压电路包括：稳压二极管VZ1。稳压电路可用于对基准电压源N1进行保护。
则在上述如图21所示的电路结构中，LED电压反馈电路能够以整体的电压(VOUT和VLED)之和进行整体的电压反馈，从而通过LED反馈电路中基准电压源N1带宽输出的调节，解决固定电压的第一LLC副边绕组的电压波动给LED灯条的电压和工作电流的 影响。
图22为本申请提供的反馈电路的电路结构另一实施例示意图，示出了如图20所示结构的另一种具体电路实现方式，其中，图22所示的结构与图21所示相似，所不同在于将隔离电路由开关管T1替换为光耦O1，则需要对LED电压反馈电路中的连接关系进行适应性的调整。其中，基准电压源N1的第一端通过偏置电阻R4连接电压调整模块a171的输出端VOUT，限流电阻R5的第一端连接电压调整模块a171的输出端VOUT，限流电阻R5的第二端连接光耦O1的第一输入端，第一分压电阻的第一端R8通过第一电容C2连接光耦O1的第二输入端，光耦O1的第一输出端连接电压调整模块a171的输出端VOUT，光耦O1的第二输出端连接DC-DC电压反馈电路a201中的第四电阻R3。
在显示装置中，通常包含有背光模块以及显示面板，其中背光模块中可以设置有电源、主板、发光装置以及发光装置所对应的发光驱动装置。电源可以为主板以及发光驱动装置供电，使得主板接收外部服务器或者光纤等传输过来的图像信号，通过主板上控制器对图像信号的处理，向发光驱动装置传递控制信号，使得发光驱动装置在接收到控制信号之后对其进行解析，并依据控制信号中所携带的灯区工作状态的信息对灯区进行驱动。然而，当背光模块增大或者当显示面板的显示亮度需提升时，背光模块所需的功率增多，上述方法无法满足背光模块的需求。
本申请提供的显示装置和显示控制方法，旨在解决相关技术的如上技术问题。
下面以具体地实施例对本申请的技术方案以及本申请的技术方案如何解决上述技术问题进行详细说明。下面这几个具体的实施例可以相互结合，对于相同或相似的概念或过程可能在某些实施例中不再赘述。下面将结合附图，对本申请的实施例进行描述。
图23为本申请实施例提供的一种显示装置的结构示意图，如图23所示，该显示装置中包括有背光模块和显示面板。背光模块中设置有多个电源、控制器、以及和多个电源对应的灯区；在多个电源中，包括有两类电源，一类电源为第一电源，该第一电源用于为控制器提供正供电信号以及驱动该第一电源对应的灯区工作。另一类电源为第二电源，该第二电源用于驱动第二电源所对应的灯区工作。需要说明的是，本实施例中的电源与灯区之间的对应关系，可以为一个电源对应多个灯区，也可以为一个电源对应一个灯区；并且其中第一电源与第二电源各自的数量可以为一个也可以为多个，不作具体限制。
并且，本申请实施例中的灯区是通过接收控制器产生的驱动信号发光的，其中，控制器产生的驱动信号是通过负压驱动的方式产生的，具体的，多个电源用于输出负供电信号和负参考信号，驱动信号是控制器通过控制信号以及接收到的电源所提供的负供电信号、负参考信号而生成的。
此外，该实施例中的控制器还可以用于在待机模式下，控制第一电源工作，第二电源关闭。在非待机的模式下，通过控制第一电源和第二电源均处于工作状态。
一个示例中，图24为本申请实施例提供的一种背光模块的结构示意图。如图24所示，图24中仅以两个电源和两个灯区为例，并且一个电源对应一个灯区，电源a对应灯区a，电源b对应灯区b。电源a为图23中提及的第一电源，用于为控制器提供正供电信号，并且电源a还为控制器提供负参考信号和负供电信号，使得控制器在电源a提供的负参考信号、负供电信号以及控制器通过外部指令生成的控制信号的作用下，驱动灯区a发光。电源b为图23中提及的第二电源，为主板提供负参考信号和负供电信号，使得控制器在电源b提供的参考信号、供电信号以及控制器通过外部指令生成的控制信号的作用下，驱动 灯区b发光。
在本实施例中，多个电源通过控制器驱动电源对应的灯区，通过上述装置，可以避免由于灯区不断增多所需的功率不断增加而导致现有的装置无法满足灯区的功耗需求，进而导致显示装置的显示界面出现问题，影响用户的使用。
图25为本申请实施例提供的一种灯区电流流向示意图，其中控制器的驱动方式为现有的正压驱动模式。在图3中，以电源b和灯区b为例，此时灯区b的电流走向为从灯区b对应的对应电源b出发，通过控制器、灯区b的正接线端、灯区b的负接线端、控制器回到对应电源b，形成电流环路。电源b为发光驱动模块提供的供电信号为正电信号。图25中仅仅展示出多电源中的任一电源与其对应的灯区之间的电流流向示意图，其余电源与其对应灯区之间的电流流向回路与其相同，且图3中的虚线仅代表电流流向，不代表实际连接线。
在图23所示实施例中，控制器驱动灯区工作的模式为负压驱动的模式。在该模式下，各灯区的正接线端接地，各灯区的负接线端均与发光驱动模块连接。且控制器可以与多电源中的第一电源连接，由第一电源为其提供正电；此外，控制器与多个电源之间均有连接关系，并且此时多个电源中的第一电源和第二电源均给控制器提供负供电信号和负参考信号。一个示例中，在显示装置中，还可以包括有背板，各灯区的正接线端也可以通过连接在背板上之后通过背板与地连接，其中灯区可采用螺丝钉将灯区中的发光器件与背板电气连接在一起。
图26为本申请实施例提供的另一种灯区电流流向示意图，其中控制器驱动灯区的驱动方式为负压驱动模式。在图26中，以电源b和灯区b为例，此时灯区b的电流走向为从灯区b对应的对应电源b出发，通过背板、灯区b的正接线端、灯区b的负接线端、控制器回到对应电源b。并且在此过程中，电源b为发光驱动模块提供的供电信号为负供电信号。图26中仅仅展示出负压驱动模式下，多电源中的任一电源与其对应的灯区之间的电流流向示意图，其余电源与其对应灯区之间的电流流向回路与其相同，且图26中的虚线仅代表电流流向，不代表实际连接线。
在本申请实施例中，显示装置中的灯区驱动方式为负压驱动的模式相比于正压驱动模式下的显示装置，在负压驱动的模式下，灯区的正接线端可以通过螺丝钉将其连接在背板上或者直接接地，通过上述连接关系，可以减少灯区与控制器之间的连接线，以及连接线的连接器数量，从而可以降低控制器占用电路板的面积。
在一些实施例中，为了向控制器输出负供电信号以及负参考信号，本申请实施例提供了一种电源的结构。图27为本申请实施例提供的一种电源的结构示意图。如图27所示，本申请的电源结构适用于图23中的第二电源。该第二电源中包括有：线圈绕组模块b41和第一隔离电压变换模块b42。
其中，线圈绕组模块b41与第一隔离电压变换模块b42中的初级线圈耦合，且线圈绕组模块b41通过控制器与灯区连接；第一隔离电压变换模块b42可用于接收供电信号，并对接收到的供电信号进行电压变换后输出负参考信号，并提供给控制器以及线圈绕组模块b41；线圈绕组模块b41用于在接收到供电信号和第一隔离电压变换模块b42产生的负参考信号后，耦合获得负供电信号，并提供给控制器；其中，负供电信号和负参考信号用于提供给控制器生成驱动信号。
一个示例中，第一隔离电压变换模块b42接收的供电信号为市电。
一个示例中，第一隔离电压变换模块b42接收的供电信号为对市电处理过的供电信号。具体地，在对市电交流电(100V-240V，50-60Hz)进行处理时，处理过程包括：滤波、滤波整流、以及功率因数校正。即第二电源中还可以包括滤波模块、滤波整流模块、功率因数校正模块等用于对市电进行处理的模块。图28为本申请实施例提供的第二种电源的结构示意图。如图28所示，其中滤波模块b51对接收到的市电进行滤波，例如高频滤波等，在一些实施例中，也可不设置滤波模块b51。
之后滤波整流模块b52对滤波后的信号进行滤波整流，将接收到的交流波信号转换为全波信号。在滤波整流模块b52处理之后，通过功率因数校正模块b53对滤波整流模块b52产生的供电信号进行相位的调整，使得电流和电压的相位相同，并且可以有效的提高电源的功率因数，在一些实施例中也可以不设置功率因数校正模块b53。
之后，功率因数校正模块b53将校正后的供电信号提供给线圈绕组模块b41和第一隔离电压变换模块b42。
通过上述实施例所提供的电源结构，通过添加线圈绕组b41可以向控制器输出负供电信号和负参考信号，使得控制器可以通过负压驱动的方式驱动灯区工作。
在一些实施例中，为了向控制器输出负供电信号以及负参考信号，本申请实施例提供了第三种电源的结构。图29为本申请实施例提供了第三种电源的结构示意图。如图29所示，本申请的电源结构适用于图23中的第一电源。其中第一电源包括：线圈绕组模块b71、第二隔离电压变换模块b72和第三隔离电压变换模块b73；
第二隔离电压变换模块b72用于接收供电信号，并且通过对供电信号进行电压变换，使得第二隔离电压变换模块b72生成正供电信号，并将正供电信号提供给与第二隔离电压变换模块b72的输出端连接的控制器。
第三隔离电压变换模块b73用于接收供电信号，并且通过对供电信号进行电压变换，使得第三隔离电压变换模块b73生成负参考信号；
线圈绕组模块b71和第二隔离电压变换模块b72耦合连接，且线圈绕组模块b71与控制器连接，线圈绕组模块b71用于接收供电信号和第三隔离电压变换模块b73生成负参考信号，耦合获得负供电信号；其中，负供电信号和负参考信号均用于提供给控制器生成驱动信号。
本实施例中的供电信号可以为市电交流信号或者对市电交流信号处理后的信号，具体的市电交流信号处理过程可参见图28。
通过上述实施例所提供的电源结构，可以向控制器输出负供电信号和负参考信号，使得控制器可以通过负压驱动的方式驱动灯区工作，并且还可以为控制器提供正供电信号使得控制器工作。
在上述图27和图29所示的实施例中，提供了在负压驱动的模式下，可以通过将线圈绕组与隔离电压变换模块耦合连接之后，为发光驱动模块提供负供电信号的方式。在该供电方式下，显示装置中的电源电路结构具有如图27和图29所示的两种不同的连接方式。
在一些实施例中，为了向控制器输出负供电信号以及负参考信号，本申请实施例提供了第四种电源的结构。图30为本申请实施例提供了第四种电源的结构示意图。如图30所示，本申请的电源结构适用于图23中的第一电源。其中，第一电源包括：降压模块b81、第一电压变换模块b82和第二电压变换模块b83。
第一电压变换模块b82，用于对接收的供电信号进行电压变换，得到正供电信号，并 将正供电信号发送给与其输出端连接的控制器，为控制器供电。
第二电压变换模块b83，用于对接收的供电信号进行电压变换，得到负参考信号，并将负参考信号发送给与其连接的控制器以及降压模块b81。
降压模块b81的第一输入端与第二电压变换模块b83连接，降压模块b81的第二输入端接地，降压模块b81用于基于第二电压变换模块b83产生的负参考信号输出负供电信号，并将负供电信号输出给与其连接的控制器；其中，负供电信号和负参考信号用于提供给控制器生成驱动信号，以驱动灯区工作，并且降压模块b81可以通过一些降压电路来实现，例如Buck电路等DC-DC变换器，也可以通过低压差线性稳压器(Low Dropout Regulator，简称LDO)来实现。
在一些实施例中，为了向控制器输出负供电信号以及负参考信号，本申请实施例提供了第五种电源的结构。图31为本申请实施例提供的第五种电源的结构示意图。如图31所示，本申请的电源结构适用于图23中的第二电源。其中，第二电源包括：降压模块b91和第三电压变换模块b92；
第三电压变换模块b92用于接收供电信号，并对供电信号进行电压变换后得到负参考信号，提供给与其连接的降压模块b91；
降压模块b91的第一输入端与第三电压变换模块b92连接，降压模块的第二输入端接地，降压模块b91用于基于第三电压变换模块b92产生的负参考信号输出负供电信号给与第三电压变换模块b92输出端连接的控制器；其中，负供电信号和负参考信号用于提供给控制器生成驱动信号，以驱动灯区工作，并且降压模块b91可以通过一些降压电路来实现，例如Buck电路等DC-DC变换器，也可以通过低压差线性稳压器(Low Dropout Regulator，简称LDO)来实现。在上述图30和图31所示的实施例中，提供了一种在负压驱动的模式下，控制器另一种供电方式，即通过降压电路或者低压差线性稳压器来为控制器供电，并且基于这种供电方式，显示装置中的电源具有如图30和图31所示的两种不同的电路连接方式。相比于通过添加线圈绕组的供电方式，该供电方法适用于负参考电压设置的足够低时，可直接利用降压电路或者低压差线性稳压器进行降压操作，得到负供电信号。并且，当添加绕组模块不方便时，采用本实施例所提供的装置也更加容易实现。
在一些实施例中，显示装置的控制器中包括有主板、微处理器、以及多个恒流驱模块(例如，多个集成的恒流芯片，IC芯片)，其中微处理器模块分别与主板和多个恒流驱动模块连接，用于对主板传输过来的控制信号进行解析并将解析后的控制信号发送给多个恒流驱动模块，并且微处理器模块还与多电源中的任一电源连接，使得任一电源为其供电。多个恒流驱动模块与其对应的电源连接，通过电源为恒流驱动模块提供负参考信号以及基于负参考信号的负供电信号；并且恒流驱动模块还与对应的灯区的负接线端连接，用于为其对应的灯区提供驱动信号，其中多个恒流驱动模块与多个灯区一一对应连接。即，恒流驱动模块通过接收负参考信号和负供电信号，并依据微处理器解析的控制信号、负参考信号和负供电信号，向对应的灯区提供驱动信号。此外，由于在负压驱动模式下，主板的参考地为大地，而发光驱动模块中的恒流驱动模块的参考地为其对应的电源所产生的负参考信号，因此需要设置隔离装置，使得主板与发光驱动模块之间的信号能够正常传输。
图32为本申请实施例提供的一种负压驱动模式下的隔离方式结构示意图(以两个电源，电源a、电源b为例，其中电源a为第一电源、电源b为第二电源)。当微处理器的参考地为电源产生的负参考信号时，此时由于主板的参考地为大地，所以此时需要在主板 与发光驱动模块之间设置第一隔离模块，即主板与发光驱动模块中的微处理器之间通过第一隔离模块连接。第一隔离模块用于对主板产生的控制信号进行电平转换，并将获得的控制信号发送给微处理器进行解析，保证了主板与微处理器之间的信号能够正常传输，避免由于二者之间参考地不同而导致信号之间存在干扰而无法正常传输。
一个示例中，在第一隔离模块中，对于高频信号而言(例如时钟信号、同步信号等)，可以采用电容隔离器件或者磁隔离器件隔离两个参考地，而对于低频信号而言(例如片选信号)，可直接通过非隔离的电平转换电路实现。具体地，在连接时，主板的输出信号分别与第一隔离模块中的隔离器件与电平转换电路的输入端连接，第一隔离模块中的隔离器件与电平转换电路的输出端与微处理器模块连接。并且，IC芯片a与灯区a的负接线端连接，IC芯片b与灯区b的负接线端连接，灯区a与灯区b的正接线端均接地。图32中未示出灯区a与灯区b的连接方式。
此外，在图32中，当电源a与电源b所产生的负参考电压不同时，即此时电源a提供给微处理器和IC芯片a的负参考电压为同一参考地，但是电源b提供给IC芯片b的负参考电压为另一参考地，两个负参考信号的参考地不同，因此在微处理器与IC芯片b之间仍需要设置一个第一隔离模块，图32中未示出。
在一些实施例中，图33为本申请实施例提供的另一种负压驱动模式下的隔离方式的结构示意图(以两个电源为例，两个电源分别为电源a与电源b，电源a与电源b分别对应灯区a与灯区b)。其中，微处理器接地，用于对主板产生的控制信号进行解析；
当微处理器的参考地与主板相同时，此时，由于微处理器与图中的两个恒流驱动模块之间的参考地不同，因此此时设置两个第二隔离模块，其中第二隔离模块用于对微处理器解析后的控制信号进行电平转换，并将转换后的控制信号发送给对应的恒流驱动模块，并且第二隔离模块与恒流驱动模块之间一一对应。恒流驱动模块接收负参考信号和负供电信号，并依据转换后的控制信号、负参考信号和负供电信号，向对应的灯区提供驱动信号。
具体地，可以将两个第二隔离模块的输入端与微处理器连接，两个第二隔离模块的输出端分别与其对应的恒流驱动模块的输入端连接(即分别连接IC芯片a、IC芯片b)，两个第二隔离模块对微处理器解析后的信号进过电平转换后，发送给各自对应的恒流驱动模块。并且在图33中，电源a、电源b分别为IC芯片a、IC芯片b提供各自的负参考信号和基于各自负参考信号的负供电信号。在第二隔离模块中，对于高频信号而言(例如时钟信号、同步信号等)，可以采用电容隔离器件或者磁隔离器件隔离两个参考地，而对于低频信号而言(例如片选信号)，可直接通过非隔离的电平转换电路实现。
图32与图33所示的装置分别为本申请提供的负压驱动方式下的两种不同的隔离方式的结构示意图，通过这两种不同的隔离方式，可以保证不同参考地之间可以进行信号传输，避免了由于参考地不同而导致信号出现电磁干扰。
在一些实施例中，上述显示装置中还包括有多个开关，电源与开关之间一一对应。并且多个电源之间也可以通过开关连接。其中，一种连接方式为：将为主板供电的电源作为主电源，剩余的其余电源可以通过与其对应的开关连接到主电源中的滤波模块之后，并且，该开关可以通过开关指示信号对其进行控制，具体的该开关控制信号是由主板发送的。
图34为本申请实施例提供的一种多电源控制下的负压驱动的背光模块的电路示意图。图34中两个电源为例，电源b1为主板提供正供电信号，电源b2的接收模块通过开关装置连接到电源b1的滤波模块之后，通过SW控制信号控制开关装置的开启和关闭，该SW 控制信号是通过主板发送的。
此外电源b1采用的供电方式与本申请图7所示的方式相同。电源b1与电源b2中均设置有用于对市电交流电进行处理的模块，只是在图34中将功率因数校正模块与电压变换模块集成到了一块芯片上。并且，电源b1还为IC芯片提供负参考信号以及负供电信号，电源b2为IC芯片提供负参考信号以及负供电信号，每一IC芯片都对应连接一个第二隔离模块，通过对应的第二隔离模块与微处理器模块连接，使得微处理器能够将主板发送到微处理器的控制信号解析后发送给IC芯片，之后IC芯片依据对应电源提供的负供电信号和负参考信号向对应的灯区发送驱动信号，使得对应灯区点亮。
并且，在图34所示的电路示意图中，标号b131、标号b132、标号b133所示的3个信号的参考地为同一参考地。标号b134、标号b135、标号b136所示的参考地为同一参考地，且标号b131与标号b134的参考地不同。
上述实施例所示的多电源控制下的负压驱动的背光模块的电路示意图中，通过为不同灯区和不同电源进行不同的浮地设计，即选用不同的参考地，可以确保灯区与电源之间的一一对应，并且多个电源能够保证不同灯区的功耗需求，避免灯区过大而导致功率不足的问题。
此外，在负压驱动模式下，当需要通过背板代替灯区正接线端处的连接线时，背板可以选用金属板或者铝塑板。当选用铝塑板作为背板时，由于铝塑板中间结构为绝缘层，因此灯区中的灯条在通过背板接地时，很容易出现中间断开的问题，导致整个背光模块中的电路连接不稳定，因此此时可以额外的添加铆钉或螺丝在铝塑板中，通过铆钉或螺丝连接铝塑板两侧，保证灯区在通过背板接地时不会断开。
本申请实施例还公开了一种显示控制方法，应用于上述的显示装置。图35为本申请提供的一种显示控制方法的流程示意图。
如图35所示，该方法包括，步骤101、确定当前是否处于待机模式。
步骤102a若当前处于待机模式，则控制第一电源工作并控制第二电源关闭。
步骤102b若当前处于非待机模式，则控制第一电源和第二电源工作。
示例性地，在上述显示装置中，首先可以将与控制器连接的第一电源打开，使得该电源可以为主板提供正供电信号。在控制器可以接收用户对于显示装置的控制指令，确定当前显示装置是否处于待机模式。例如，控制器可以接收用户对显示装置上电源按钮的操作以及启动显示装置按钮的操作，若用户打开显示装置的电源按钮后，未启动显示装置，则表明当前显示装置处于待机模式；若用户开启电源按钮后，继续通过按钮启动显示装置，则表明当前显示装置处于非待机模式。在确定当前的模式之后，控制器控制显示装置中电源的工作状态。即，当显示装置目前处于待机模式时，控制器可以控制第二电源关闭，同时第一电源继续工作；当显示装置目前处于非待机模式时，控制器可以控制第一电源与第二电源同时工作。
举例来说，每个电源中可以设置有开关装置，该开关装置可以用于接收控制器发送的开关控制信号，来控制电源开启或停止工作。在本实施例中，通过控制器控制显示装置中的电源的在待机与非待机模式下的开启与关闭，可以降低显示装置的功耗以及显示装置的损耗，延长显示装置的使用寿命。
在一些实施例中，多个电源提供的负供电信号和负参考信号还与对应的灯区内发光元件的功率相匹配；即在步骤101之前，还需要按照相同功率的发光元件属于同一灯区的规 则，对背光模块的所有发光元件进行划分，获得多个灯区。
本领域技术人员在考虑说明书及实践这里公开的发明后，将容易想到本申请的其它实施方案。本申请旨在涵盖本申请的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本申请的一般性原理并包括本申请未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本申请的真正范围和精神由下面的权利要求书指出。
应当理解的是，本申请并不局限于上面已经描述并在附图中示出的精确结构，并且可以在不脱离其范围进行各种修改和改变。本申请的范围仅由所附的权利要求书来限制。

Claims (20)

  1. 一种显示装置，包括：背光模块和显示面板；其中，所述背光模块包括多个电源、控制器、以及和所述多个电源对应的灯区；
    所述控制器与所述多个电源和所述多个灯区连接；所述多个电源包括用于向控制器提供正供电信号以及驱动灯区的第一电源，和用于驱动灯区的第二电源；
    所述多个电源输出负供电信号和负参考信号；所述控制器基于接收的控制信号、负供电信号和负参考信号，采用负压驱动的方式输出驱动信号；所述驱动信号用于驱动被选择的电源对应的灯区发光，所述灯区发出的光投射至所述显示面板，为所述显示面板提供背光；
    其中，所述控制器在待机模式下控制第一电源工作以及控制第二电源关闭，并在非待机模式下控制第一电源和第二电源工作。
  2. 根据权利要求1所述的装置，所述第二电源包括：线圈绕组模块和第一隔离电压变换模块；
    所述线圈绕组模块与所述第一隔离电压变换模块耦合，且所述线圈绕组模块通过控制器与所述灯区连接；所述第一隔离电压变换模块用于接收供电信号，进行电压变换后输出负参考信号；所述线圈绕组模块接收供电信号和所述负参考信号，耦合获得负供电信号；
    其中，所述负供电信号和所述负参考信号用于提供给所述控制器生成驱动信号。
  3. 根据权利要求1所述的装置，所述第一电源包括：线圈绕组模块、第二隔离电压变换模块和第三隔离电压变换模块；
    所述第二隔离电压变换模块接收供电信号，所述第二隔离电压变换模块的输出端与所述控制器连接；所述线圈绕组模块与所述第二隔离电压变换模块耦合连接，且所述线圈绕组模块通过控制器与所述灯区连接；所述第三隔离电压变换模块接收供电信号；
    所述第二隔离电压变换模块用于对供电信号进行电压变换，获得正供电信号，所述正供电信号用于提供给所述控制器；所述第三隔离电压变换模块用于对供电信号进行电压变换，获得负参考信号；所述线圈绕组模块用于接收供电信号和所述负参考信号，耦合获得负供电信号；
    其中，所述负供电信号和所述负参考信号用于提供给所述控制器生成驱动信号。
  4. 根据权利要求1所述的装置，所述第一电源包括：降压模块、第一电压变换模块和第二电压变换模块；
    所述第一电压变换模块接收供电信号，所述第一电压变换模块的输出端与所述控制器连接；所述第二电压变换模块接收供电信号；所述降压模块的第一输入端与所述第二电压变换模块连接，所述降压模块的第二输入端接地，所述降压模块的输出端通过所述控制器与所述灯区连接；
    所述第一电压变换模块对供电信号进行电压变换，获得正供电信号，所述正供电信号用于提供给所述控制器；所述第二电压变换模块对供电信号进行电压变换，获得负参考信号；所述降压模块基于所述第二电压变换模块产生的所述负参考信号输出负供电信号；
    其中，所述负供电信号和所述负参考信号用于提供给所述控制器生成驱动信号。
  5. 根据权利要求1所述的装置，所述第二电源包括：降压模块和第三电压变换模块；
    所述第三电压变换模块接收供电信号；所述降压模块的第一输入端与所述第三电压变 换模块连接，所述降压模块的第二输入端接地，所述降压模块的输出端通过所述控制器与所述灯区连接；
    所述第三电压变换模块，用于对供电信号进行电压变换，获得负参考信号；所述降压模块，用于基于所述第三电压变换模块产生的所述负参考信号输出负供电信号；
    其中，所述负供电信号和所述负参考信号用于提供给所述控制器生成驱动信号。
  6. 根据权利要求1-5中任一项所述的装置，所述控制器包括：主板、微处理器、以及多个恒流驱动模块；所述主板和所述微处理器之间连接有第一隔离模块；
    所述微处理器分别与第一电源和所述多个恒流驱动模块连接；所述多个电源与对应的恒流驱动模块连接；所述多个恒流驱动模块与所述多个灯区一一对应连接；
    所述第一隔离模块，用于对所述主板产生的控制信号进行电平转换，并将获得的控制信号发送给所述微处理器进行解析；
    所述恒流驱动模块接收负参考信号和负供电信号，并依据所述微处理器解析的控制信号、所述负参考信号和所述负供电信号，生成并向对应的灯区提供驱动信号。
  7. 根据权利要求1-5中任一项所述的装置，所述控制器包括：主板、与主板连接的微处理器、以及多个恒流驱动模块；所述装置还包括多个第二隔离模块，所述多个第二隔离模块与所述多个恒流驱动模块一一对应；所述多个恒流驱动模块通过对应的第二隔离模块与所述微处理器连接；
    所述微处理器接地，用于对主板产生的控制信号进行解析；
    所述第二隔离模块，用于对所述微处理器解析后的控制信号进行电平转换，并将转换后的控制信号发送给对应的恒流驱动模块；
    所述恒流驱动模块接收负参考信号和负供电信号，并依据所述转换后的控制信号、所述负参考信号和所述负供电信号，生成并向对应的灯区提供驱动信号。
  8. 根据权利要求1-5中任一项所述的装置，所述装置还包括背板；所述多个灯区的高电平端均通过所述背板接地。
  9. 一种显示控制方法，应用于如权利要求1-8任一项所述的显示装置，包括：
    确定当前是否处于待机模式；
    若当前处于待机模式，则控制第一电源工作并控制第二电源关闭；
    若当前处于非待机模式，则控制第一电源和第二电源工作。
  10. 根据权利要求9所述的方法，所述多个电源提供的负供电信号和负参考信号与对应的灯区内发光元件的功率匹配；所述确定当前是否处于待机模式之前，还包括：
    按照相同功率的发光元件属于同一灯区的规则，对所述背光模块的所有发光元件进行划分，获得多个灯区。
  11. 一种显示装置，包括：
    显示屏，被配置为显示图像画面；
    多个LED驱动组件，每个LED驱动组件用于向所连接的多路发光二极管LED灯条供电，所述LED灯条被配置为点亮所述显示屏；
    供电电路，被配置为向所述多个LED驱动组件供电；其中，所述供电电路具体被配置为，生成第一电压和第二电压，并通过所述第一电压和所述第二电压同时为所述多个LED驱动组件供电。
  12. 根据权利要求11所述的显示装置，
    所述供电电路具体被配置为，向所述多个LED驱动组件的正极提供正向的第一电压、向所述多个LED驱动组件的负极提供负向的第二电压。
  13. 根据权利要求12所述的显示装置，所述供电电路包括：
    LLC原边绕组，被配置为接收输入电压；
    第一LLC副边绕组，所述第一LLC副边绕组的正极分别连接所述多个LED驱动组件的正极，所述第一LLC副边绕组的负极接地；所述第一LLC副边绕组被配置为将所述输入电压转换为第一电压后，向所述多个LED驱动组件的正极输出所述第一电压；所述第一LLC副边绕组的负极接地；
    第二LLC副边绕组，所述第二LLC副边绕组的正极接地，所述第二LLC副边绕组的负极分别连接所述多个LED驱动组件的负极；所述第二LLC副边绕组被配置为将所述输入电压转换为第二电压后，向所述多个LED驱动组件的正极输出所述第二电压。
  14. 根据权利要求13所述的显示装置，所述供电电路还包括：
    多个电压调整模块；每个所述第一LLC副边绕组的正极通过所述电压调整模块连接所述LED驱动组件的正极；
    所述LED驱动组件被配置为，根据所连接的多路LED灯条的工作电压向所述电压调整模块发送反馈信号；所述电压调整模块被配置为，根据所述反馈信号，对向所述多路LED驱动组件输出的所述第一电压进行调整。
  15. 根据权利要求14所述的显示装置，所述供电电路还包括：
    多个反馈电路，每个所述LED驱动组件通过一个所述反馈电路连接对应的所述电压调整模块；
    所述反馈电路被配置为，接收所述LED驱动组件输出的第一反馈信号，将第一反馈信号转换为第二反馈信号后，向所述电压调整模块输出所述第二反馈信号；其中，所述第一反馈信号和所述第二反馈信号的参考地电平不同。
  16. 根据权利要求15所述的显示装置，所述反馈电路包括：
    VI变换电路和DC-DC电压反馈电路；
    所述VI变换电路用于将电压信号形式的所述第一反馈信号转换为电流信号形式的所述第二反馈信号并发送至所述DC-DC电压反馈电路；
    所述DC-DC电压反馈电路用于接收并向所述电压调整模块发送所述第二反馈信号。
  17. 根据权利要求15所述的显示装置，所述反馈电路包括：
    LED电压反馈电路、隔离电路和DC-DC电压反馈电路；
    所述LED电压反馈电路用于，根据所述第一电压和所述第一反馈信号，生成第一中间信号；
    所述隔离电路用于，接收所述第一中间信号，并生成隔离后的第二中间信号；
    所述DC-DC电压反馈电路用于接收所述第二中间信号，根据所述第二中间信号生成第二反馈信号，并向所述电压调整模块发送所述第二反馈信号。
  18. 根据权利要求17所述的显示装置，
    所述隔离电路包括：开关管；或者，光耦。
  19. 根据权利要求17或18所述的显示装置，所述DC-DC电压反馈电路还包括：
    前馈电路，用于提供前馈补偿；其中，所述前馈电路的第一端连接所述电压调整模块的输出端，所述前馈电路第二端连接所述电压调整模块的反馈输入端。
  20. 根据权利要求17或18所述的显示装置，所述LED电压反馈电路还包括：
    稳压电路，设置在所述电压调整模块的输出端和所述基准电压源之间，用于对基准电压源进行保护。
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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113904546A (zh) * 2020-07-06 2022-01-07 台达电子企业管理（上海）有限公司 电压切换电路与电源适配器
EP4301094A1 (en) * 2021-08-20 2024-01-03 Samsung Electronics Co., Ltd. Display apparatus and control method therefor
CN114141203B (zh) * 2021-12-03 2023-04-07 Tcl华星光电技术有限公司 背光驱动电路及显示装置
CN115733560A (zh) * 2022-10-31 2023-03-03 华为数字能源技术有限公司 电源供电系统及ict设备
US11844156B1 (en) * 2022-11-15 2023-12-12 Paragon Semiconductor Lighting Technology Co., Ltd. LED illumination device and color temperature switching method thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202940727U (zh) * 2012-11-13 2013-05-15 青岛海信电器股份有限公司 供电电路和液晶电视
CN105099202A (zh) * 2012-06-25 2015-11-25 青岛海信电器股份有限公司 一种供电方法、供电电路及电子设备
CN106910475A (zh) * 2017-04-28 2017-06-30 四川长虹电器股份有限公司 新型液晶电视背灯驱动电路
CN108665859A (zh) * 2018-08-01 2018-10-16 合肥惠科金扬科技有限公司 背光源控制电路及背光源
CN208848603U (zh) * 2018-10-17 2019-05-10 深圳创维－Rgb电子有限公司 一种背光源的控制电路和显示终端
CN110048610A (zh) * 2019-04-04 2019-07-23 深圳康佳电子科技有限公司 一种应用于llc谐振架构的自适应背光电源电路

Family Cites Families (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008075389A1 (en) * 2006-12-21 2008-06-26 Osram Gesellschaft mit beschränkter Haftung A cell arrangement for feeding electrical loads such as light sources, corresponding circuit and design method
TWI404452B (zh) * 2008-07-01 2013-08-01 Delta Electronics Inc 發光二極體之電流供電電路以及電流控制電路
TWI373779B (en) * 2009-04-27 2012-10-01 Delta Electronics Inc Current-balancing transformer and power supply circuit using the same
TWI379483B (en) * 2009-07-07 2012-12-11 Delta Electronics Inc Current balance power supplying circuit for plural sets of dc loads
US9000673B2 (en) * 2010-05-25 2015-04-07 Virginia Tech Intellectual Properties, Inc. Multi-channel two-stage controllable constant current source and illumination source
US20120062190A1 (en) * 2010-09-10 2012-03-15 Holger Haiplik Dc-dc converters
US8508958B2 (en) * 2011-04-01 2013-08-13 Power Integrations, Inc. LLC controller with programmable fractional burst frequency
CN202058426U (zh) 2011-05-27 2011-11-30 青岛海信电器股份有限公司 一种led驱动电路及电视机
CN202102692U (zh) 2011-06-16 2012-01-04 青岛海信电器股份有限公司 一种led驱动电路及液晶电视机
CN102244964B (zh) * 2011-07-07 2013-09-25 矽力杰半导体技术(杭州)有限公司 一种复合型多输出电源及其调节方法
CN102523406B (zh) 2011-12-07 2014-01-08 青岛海信电器股份有限公司 电源电路结构以及led液晶电视
KR20130082016A (ko) 2012-01-10 2013-07-18 삼성전자주식회사 표시 장치 및 그 구동 방법
CN102833912A (zh) 2012-07-30 2012-12-19 深圳创维－Rgb电子有限公司 Led电源电路、背光模组和液晶显示装置
CN102917516B (zh) 2012-11-14 2015-04-29 深圳市华星光电技术有限公司 解决恒流驱动芯片温度过高的方法及led灯条驱动电路
CN203675399U (zh) 2014-01-22 2014-06-25 杭州茂力半导体技术有限公司 发光元件驱动系统及驱动控制电路
US9241380B2 (en) * 2014-03-04 2016-01-19 Osram Sylvania Inc. Hybrid dimming control techniques for lighting drivers
CN103916018B (zh) * 2014-03-28 2016-09-21 上海新进半导体制造有限公司 一种开关电源
EP2947963B1 (en) * 2014-05-20 2019-09-11 Nxp B.V. Controller
US9917524B2 (en) * 2014-09-05 2018-03-13 Queens' University At Kingston Energy channelling single stage power converter
US20170099011A1 (en) * 2015-10-02 2017-04-06 Advanced Charging Technologies, LLC Electrical circuit for delivering power to consumer electronic devices
CN107909969A (zh) 2016-10-11 2018-04-13 京东方科技集团股份有限公司 驱动电路、背光源和显示装置
CN207070393U (zh) 2017-06-19 2018-03-02 合肥惠科金扬科技有限公司 多路恒流输出驱动电路和显示设备
CN107454712B (zh) 2017-07-27 2020-05-15 海信视像科技股份有限公司 显示装置、照明装置及可同时恒流和恒压输出的电源电路
CN109427305A (zh) * 2017-09-05 2019-03-05 京东方科技集团股份有限公司 控制电路、显示装置及用于向显示装置中的光源供电的方法
US10483850B1 (en) * 2017-09-18 2019-11-19 Ecosense Lighting Inc. Universal input-voltage-compatible switched-mode power supply
CN207251987U (zh) 2017-10-17 2018-04-17 广州视源电子科技股份有限公司 一种原边反馈反激的多路恒流电路
CN108364613B (zh) 2018-02-07 2020-03-06 青岛海信电器股份有限公司 Led背光驱动电路、led背光灯、电视终端
KR102532036B1 (ko) * 2018-03-05 2023-05-15 삼성전자주식회사 이미지가 정상적으로 표시되도록 출력 전압을 제어하는 디스플레이 장치

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105099202A (zh) * 2012-06-25 2015-11-25 青岛海信电器股份有限公司 一种供电方法、供电电路及电子设备
CN202940727U (zh) * 2012-11-13 2013-05-15 青岛海信电器股份有限公司 供电电路和液晶电视
CN106910475A (zh) * 2017-04-28 2017-06-30 四川长虹电器股份有限公司 新型液晶电视背灯驱动电路
CN108665859A (zh) * 2018-08-01 2018-10-16 合肥惠科金扬科技有限公司 背光源控制电路及背光源
CN208848603U (zh) * 2018-10-17 2019-05-10 深圳创维－Rgb电子有限公司 一种背光源的控制电路和显示终端
CN110048610A (zh) * 2019-04-04 2019-07-23 深圳康佳电子科技有限公司 一种应用于llc谐振架构的自适应背光电源电路

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