CN114913817A - Display device and display control method - Google Patents

Display device and display control method Download PDF

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Publication number
CN114913817A
CN114913817A CN202110177726.2A CN202110177726A CN114913817A CN 114913817 A CN114913817 A CN 114913817A CN 202110177726 A CN202110177726 A CN 202110177726A CN 114913817 A CN114913817 A CN 114913817A
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China
Prior art keywords
power supply
signal
module
negative
voltage conversion
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Granted
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CN202110177726.2A
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Chinese (zh)
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CN114913817B (en
Inventor
庞震华
刘广学
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Hisense Visual Technology Co Ltd
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Hisense Visual Technology Co Ltd
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Priority to CN202110177726.2A priority Critical patent/CN114913817B/en
Priority to PCT/CN2021/080257 priority patent/WO2021185150A1/en
Priority to PCT/CN2021/095347 priority patent/WO2022041873A1/en
Priority to US17/660,786 priority patent/US11783788B2/en
Publication of CN114913817A publication Critical patent/CN114913817A/en
Priority to US17/900,166 priority patent/US11825577B2/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
    • 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
    • G09G3/3413—Details of control of colour illumination sources

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The application provides a display device and a display control method. The backlight module comprises a controller, a plurality of power supplies and lamp zones corresponding to the plurality of power supplies, wherein the plurality of power supplies comprise a first power supply for providing a positive power supply signal for the controller and driving the lamp zones and a second power supply for driving the lamp zones. And the controller in the backlight module supplies power through the first power supply, and in addition, the lamp area sends a driving signal to the lamp area corresponding to the power supply according to a negative reference signal and a power supply signal generated by the power supply, so that the lamp area works in a negative-pressure driving mode. In addition, the working states of the first power supply and the second power supply are controllable. According to the display device powered by multiple power supplies, the power supplies do not need to bear excessive light-emitting elements, and the negative pressure drive of the whole lamp area of the backlight module can be completed, so that the problem that the backlight module meets the power requirement of the lamp area and finally causes image distortion when the lamp area is large is avoided.

Description

Display device and display control method
Technical Field
The present application relates to the field of display technologies, and in particular, to a display device and a display control method.
Background
In a screen display device, a display panel and a backlight device are generally included, wherein the backlight device is used for emitting uniform light to the display panel, so that a clear image can be finally displayed on the display panel.
In general, a light-emitting driving device is provided in a backlight device for providing a driving signal to a light-emitting element in the backlight device, such as a light-emitting device, for example, an LED light-emitting diode, so that the light-emitting device emits uniform light.
However, with the increasing of the screen display panel, the power consumption of the backlight device increases, so that the driving signal cannot meet the power requirement of the backlight device, which causes the brightness of the screen display panel to become dark or the image displayed on the screen to be distorted, thereby affecting the user experience.
Disclosure of Invention
The application provides a display device and a display control method, and the problem that the power supply power of a backlight module is insufficient in the existing display device is solved through the method.
In a first aspect, the present application provides a display device, comprising: a backlight module and a display panel; the backlight module comprises a plurality of power supplies, a controller and lamp areas corresponding to the power supplies; the plurality of power supplies are connected with the plurality of lamp areas through the controller; the plurality of power supplies comprise two types of power supplies, namely a first power supply for providing a positive power supply signal for the controller and driving the lamp area, and a second power supply for driving the lamp area; the controller outputs a negative power supply signal and a negative reference signal based on the received control signal and the plurality of power supplies, outputs a driving signal in a negative voltage driving mode, drives the lamp area corresponding to the selected power supply to emit light, and then the lamp area provides backlight for the display panel by projecting the light to the display panel; the controller controls the first power supply to work and controls the second power supply to be turned off in a standby mode, and controls the first power supply and the second power supply to work in a non-standby mode.
In some embodiments of the present application, a structure of the second power supply is that the second power supply includes: the transformer comprises a coil winding module and a first isolation voltage transformation module; the coil winding module is coupled with the first isolation voltage conversion module and is connected with the lamp area through the controller; the first isolation voltage conversion module is used for receiving a power supply signal, performing voltage conversion and outputting a negative reference signal; the coil winding module receives the power supply signal and the negative reference signal and obtains a negative power supply signal through coupling; wherein the negative supply signal and the negative reference signal are used to provide the controller with a generated drive signal.
In some embodiments of the present application, a structure of the first power supply includes: the transformer comprises a coil winding module, a second isolation voltage conversion module and a third isolation voltage conversion module; the second isolation voltage conversion module receives a power supply signal, and the output end of the second isolation voltage conversion module is connected with the controller; the coil winding module is coupled with the second isolation voltage conversion module and is connected with the lamp area through the controller; the third isolation voltage conversion module receives a power supply signal; the second isolation voltage conversion module is used for performing voltage conversion on the power supply signal to obtain a positive power supply signal and supplying the positive power supply signal to the controller; the third isolation voltage conversion module is used for performing voltage conversion on the power supply signal to obtain a negative reference signal; the coil winding module is used for receiving the power supply signal and the negative reference signal and coupling to obtain a negative power supply signal; wherein the negative supply signal and the negative reference signal are used to provide the controller with a generated drive signal.
In some embodiments of the present application, another structure of the first power supply is that the first power supply includes: the voltage reduction module, the first voltage conversion module and the second voltage conversion module; the first voltage conversion module receives a power supply signal, and the output end of the first voltage conversion module is connected with the controller; the second voltage conversion module receives a power supply signal; the first input end of the voltage reduction module is connected with the second voltage conversion module, the second input end of the voltage reduction module is grounded, and the output end of the voltage reduction module is connected with the lamp area through the controller; the first voltage conversion module performs voltage conversion on the power supply signal to obtain a positive power supply signal, and the positive power supply signal is used for being provided for the controller; the second voltage conversion module performs voltage conversion on the power supply signal to obtain a negative reference signal; the voltage reduction module outputs a negative power supply signal based on the negative reference signal generated by the second voltage conversion module; wherein the negative supply signal and the negative reference signal are used to provide the controller with a generated drive signal.
In some embodiments of the present application, another structure of the second power supply is that the second power supply includes: the voltage reduction module and the third voltage conversion module; the third voltage conversion module receives a power supply signal; the first input end of the voltage reduction module is connected with the third voltage conversion module, the second input end of the voltage reduction module is grounded, and the output end of the voltage reduction module is connected with the lamp area through the controller; the third voltage conversion module is used for performing voltage conversion on the power supply signal to obtain a negative reference signal; the voltage reduction module is used for outputting a negative power supply signal based on the negative reference signal generated by the third voltage conversion module; wherein the negative supply signal and the negative reference signal are used to provide the controller with a generated drive signal.
In some embodiments of the present application, the controller comprises: the constant current driving circuit comprises a mainboard, a microprocessor and a plurality of constant current driving modules; a first isolation module is connected between the mainboard and the microprocessor; the microprocessor is respectively connected with the first power supply and the plurality of constant current driving modules; the plurality of power supplies are connected with the corresponding constant current driving modules; the plurality of constant current driving modules are connected with the plurality of lamp areas in a one-to-one correspondence manner; the first isolation module is used for carrying out level conversion on a control signal generated by the mainboard and sending the obtained control signal to the microprocessor for analysis; the constant current driving module receives the negative reference signal and the negative power supply signal, and generates and provides a driving signal for the corresponding lamp area according to the control signal, the negative reference signal and the negative power supply signal analyzed by the microprocessor.
In some embodiments of the present application, the controller comprises: the constant current driving circuit comprises a main board, a microprocessor connected with the main board and a plurality of constant current driving modules; the device also comprises a plurality of second isolation modules, wherein the second isolation modules correspond to the constant current driving modules one to one; the constant current driving modules are connected with the microprocessor through corresponding second isolation modules; the microprocessor is grounded and is used for analyzing a control signal generated by the mainboard; the second isolation module is used for carrying out level conversion on the control signal analyzed by the microprocessor and sending the converted control signal to the corresponding constant current driving module; and the constant current driving module receives the negative reference signal and the negative power supply signal, and generates and provides a driving signal for the corresponding lamp area according to the converted control signal, the negative reference signal and the negative power supply signal.
In some embodiments of the present application, the apparatus further comprises a back plate; the high-level ends of the plurality of lamp areas are all grounded through the back plate.
In a second aspect, the present application provides a display control method applied to any one of the display devices as in the first aspect, the control method comprising: determining whether the mobile terminal is currently in a standby mode; if the current power supply is in the standby mode, controlling the first power supply to work and controlling the second power supply to be closed; and if the current mode is in the non-standby mode, controlling the first power supply and the second power supply to work.
In some embodiments of the present application, the negative supply signal and the negative reference signal provided by the plurality of power sources are matched to the power of the light emitting elements in the corresponding lamp zones; before determining whether the standby mode is currently in, further comprising: and dividing all the light-emitting elements of the backlight module according to the rule that the light-emitting elements with the same power belong to the same lamp area to obtain a plurality of lamp areas.
According to the display device and the display control method, the backlight module powered by multiple power supplies is adopted to provide backlight for the display panel, namely the backlight module comprises a plurality of power supplies which respectively correspond to different lamp areas. And the plurality of power supplies comprise a first power supply for providing a positive power supply signal for the controller and driving the lamp area, and a second power supply only used for driving the lamp area. When the backlight module works, the controller in the backlight module supplies power through a first power supply in the plurality of power supplies, and the lamp area sends a driving signal to the lamp area corresponding to the power supply according to a negative reference signal generated by different power supplies and power supply signals provided by the first power supply and the second power supply, so that the lamp area emits light in a negative-pressure driving mode. In the standby mode, the controller controls the first power supply to work, and the second power supply is turned off; in the non-standby mode, the first power supply and the second power supply are both in a working state. According to the multi-power supply display device, the backlight module adopts multi-power supply, and the driving of the whole lamp area of the backlight module can be completed without burdening excessive light-emitting elements for a single power supply, so that the problem that the backlight module cannot provide required power to finally cause image distortion and the like displayed by a display panel when the lamp area in the backlight module is large is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram illustrating a current flow of a lamp region according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of another lamp region current flow provided in the embodiments of the present application;
fig. 5 is a schematic structural diagram of a power supply according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a second power supply according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a third power supply according to an embodiment of the present application;
FIG. 8 is a schematic diagram illustrating a fourth power supply according to an embodiment of the present application;
FIG. 9 is a schematic diagram of a fifth power supply according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of an isolation manner in a negative pressure driving mode according to an embodiment of the present application;
fig. 11 is a schematic structural diagram of an isolation manner in another negative pressure driving mode according to the embodiment of the present application;
fig. 12 is a schematic circuit diagram of a negative-voltage-driven backlight module under control of multiple power supplies according to an embodiment of the present disclosure;
fig. 13 is a schematic flowchart of a display control method provided in the present application.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The following is a description of the application scenarios involved in the present application and the problems of the prior art.
At present, in order to facilitate people to obtain information, screens of various electronic products are also getting larger and larger, such as mobile phones, computers, televisions and the like. However, as the display panels of various display devices are larger, more light emitting elements need to be added in the electronic products correspondingly, and a power supply or a driving device provides a driving signal for the light emitting elements according to the power required by the light emitting elements, so that the light emitting elements can provide enough light for the display screen, and the information required by the user can be displayed clearly on the display screen.
For example, a display device generally includes a backlight module and a display panel, wherein the backlight module may include 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 for the mainboard and the light-emitting driving device, so that the mainboard receives image signals transmitted by an external server or optical fibers and the like, transmits control signals to the light-emitting driving device through the processing of the controller on the mainboard to the image signals, so that the light-emitting driving device analyzes the control signals after receiving the control signals, and drives the lamp area according to the information of the working state of the lamp area carried in the control signals. However, when the backlight module is increased or when the display brightness of the display panel needs to be increased, the power required by the backlight module is increased, and the above method cannot meet the requirement of the backlight module.
The present application provides a display device and a display control method, which aim to solve the above technical problems of the prior art.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. These several specific embodiments may be combined with each other below, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present disclosure, and as shown in fig. 1, the display device includes a backlight module and a display panel. The backlight module is provided with a plurality of power supplies, a controller and a lamp area corresponding to the power supplies; the plurality of power supplies comprise two types of power supplies, wherein one type of power supply is a first power supply, and the first power supply is used for providing a positive power supply signal for the controller and driving the lamp area corresponding to the first power supply to work. The other type of power supply is a second power supply which is used for driving the lamp area corresponding to the second power supply to work. It should be noted that, in the embodiment, the correspondence between the power supplies and the lamp zones may be that one power supply corresponds to a plurality of lamp zones, or that one power supply corresponds to one lamp zone; and the number of the first power source and the second power source may be one or more, and is not particularly limited.
In addition, 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 negative voltage driving, specifically, the plurality of power supplies are configured to output a negative power supply signal and a negative reference signal, and the driving 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 supplies.
In addition, the controller in this embodiment may be further configured to control the first power supply to operate and the second power supply to turn off in the standby mode. And in the non-standby mode, the first power supply and the second power supply are controlled to be in a working state.
In an example, fig. 2 is a schematic structural diagram of a backlight module provided in an embodiment of the present application. As shown in fig. 2, only two power sources and two lamp areas are taken as an example in fig. 2, and one power source corresponds to one lamp area, power source a corresponds to lamp area a, and power source b corresponds to lamp area b. The power supply a is the first power supply mentioned in fig. 1, and is used for providing 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 drives the lamp area a to emit light under the action of the negative reference signal and the negative power supply signal provided by the power supply a and a control signal generated by the controller through an external instruction. The power supply b is the second power supply mentioned in fig. 1, and provides a negative reference signal and a negative power supply signal for the main board, so that the controller drives the lamp area b to emit light under the action of the reference signal and the power supply signal provided by the power supply b and a control signal generated by the controller through an external instruction.
In this embodiment, the lamp area that a plurality of powers pass through controller drive power supply corresponds, through above-mentioned device, can avoid leading to the unable power consumption demand that satisfies the lamp area of current device because the lamp area constantly increases required power constantly, and then lead to display device's display interface to go wrong, influence user's use.
Fig. 3 is a schematic view illustrating a current flow direction of a lamp area according to an embodiment of the present disclosure, wherein a driving manner of a controller is a conventional positive voltage driving mode. In fig. 3, taking the power source b and the lamp area b as an example, at this time, the current of the lamp area b goes from the corresponding power source b corresponding to the lamp area b, and returns to the corresponding power source b through the controller, the positive terminal of the lamp area b, the negative terminal of the lamp area b, and the controller, so as to form a current loop. The power supply signal provided by the power supply b for the light-emitting driving module is a positive electric signal. Fig. 3 shows a schematic diagram of the current flowing direction between any one of the multiple power supplies and its corresponding lamp region, the current flowing direction loops between the remaining power supplies and their corresponding lamp regions are the same, and the dotted lines in fig. 3 only represent the current flowing direction and do not represent actual connecting lines.
Further, in the embodiment shown in fig. 1, the mode of the controller driving the lamp area to operate is a negative pressure driving mode. In this mode, the positive terminal of each lamp zone is grounded, and the negative terminal of each lamp zone is connected to the light-emitting driving module. And the controller may be connected to a first power supply of the plurality of power supplies, which is supplied with positive electricity by the first power supply; in addition, the controller is connected with the plurality of power supplies, and the first power supply and the second power supply in the plurality of power supplies provide a negative power supply signal and a negative reference signal for the controller. In one example, in the display device, a back plate may be further included, and the positive terminal of each lamp region may also be connected to the ground through the back plate after being connected to the back plate, wherein the lamp region may use a screw to electrically connect the light emitting device in the lamp region to the back plate.
Fig. 4 is a schematic view illustrating a current flow direction of another lamp region provided in the present embodiment, wherein a driving manner for driving the lamp region by the controller is a negative voltage driving mode. In fig. 4, taking the power source b and the lamp area b as an example, the current of the lamp area b goes from the corresponding power source b corresponding to the lamp area b, and returns to the corresponding power source b through the back plate, the positive terminal of the lamp area b, the negative terminal of the lamp area b, and the controller. In the process, the power supply signal provided by the power supply b for the light-emitting driving module is a negative power supply signal. Fig. 4 shows only a schematic diagram of the current flowing direction between any one of the multiple power supplies and its corresponding lamp region in the negative voltage driving mode, the current flowing direction between the remaining power supplies and their corresponding lamp regions is the same as that in the loop, and the dotted line in fig. 4 only represents the current flowing direction and does not represent an actual connection line.
In the embodiment of the application, the lamp area driving mode in the display device is a negative pressure driving mode, and compared with the display device in a positive pressure driving mode, in the negative pressure driving mode, the positive terminal of the lamp area can be connected to the back plate through a screw or directly grounded, and through the connection relation, the connecting lines between the lamp area and the controller and the number of connectors of the connecting lines can be reduced, so that the area of the circuit board occupied by the controller can be reduced.
In some embodiments, to output a negative supply signal and a negative reference signal to a controller, the present application embodiments provide a structure of a power supply. Fig. 5 is a schematic structural diagram of a power supply according to an embodiment of the present application. As shown in fig. 5, the power supply structure of the present application is applicable to the second power supply in fig. 1. The second power supply comprises: a coil winding module 41 and a first isolated voltage conversion module 42.
Wherein, the coil winding module 41 is coupled with the primary coil in the first isolation voltage conversion module 42, and the coil winding module 41 is connected with the lamp area through the controller; the first isolation voltage conversion module 42 may be configured to receive a power supply signal, perform voltage conversion on the received power supply signal, output a negative reference signal, and provide the negative reference signal to the controller and the coil winding module 41; the coil winding module 41 is configured to obtain a negative power supply signal through coupling after receiving the power supply signal and the negative reference signal generated by the first isolation voltage conversion module 42, and provide the negative power supply signal to the controller; wherein the negative supply signal and the negative reference signal are used to provide the controller with the generated driving signal.
In one example, the power supply signal received by the first isolated voltage conversion module 42 is mains power.
In one example, the power supply signal received by the first isolated voltage conversion module 42 is a power supply signal processed by a mains supply. Specifically, when commercial power alternating current (100V-240V, 50-60Hz) is processed, the processing process comprises the following steps: filtering, filter rectification, and power factor correction. That is, the second power supply may further include a filtering module, a filtering and rectifying module, a power factor correction module, and other modules for processing the commercial power. Fig. 6 is a schematic structural diagram of a second power supply according to an embodiment of the present application. As shown in fig. 6, in which the filtering module 51 filters the received commercial power, such as high-frequency filtering, in some embodiments, the filtering module 51 may not be provided.
The filtering and rectifying module 52 then performs filtering and rectifying on the filtered signal, and converts the received ac wave signal into a full wave signal. After the filtering and rectifying module 52 processes, the phase of the power supply signal generated by the filtering and rectifying module 52 is adjusted by the power factor correction module 53, so that the phases of the current and the voltage are the same, and the power factor of the power supply can be effectively improved, and in some embodiments, the power factor correction module 53 may not be provided.
After that, the power factor correction module 53 supplies the corrected power supply signal to the coil winding module 41 and the first isolation voltage conversion module 42.
With the power supply structure provided by the above embodiment, a negative power supply signal and a negative reference signal can be output to the controller by adding the coil winding 41, so that the controller can drive the lamp area to operate in a negative voltage driving manner.
In some embodiments, in order to output a negative supply signal and a negative reference signal to the controller, the embodiments of the present application provide a third power supply structure. Fig. 7 is a schematic structural diagram of a third power supply according to an embodiment of the present application. As shown in fig. 7, the power supply structure of the present application is applicable to the first power supply in fig. 1. Wherein the first power supply includes: a coil winding module 71, a second isolation voltage conversion module 72, and a third isolation voltage conversion module 73;
the second isolation voltage conversion module 72 is configured to receive the power supply signal, and perform voltage conversion on the power supply signal, so that the second isolation voltage conversion module 72 generates a positive power supply signal and supplies the positive power supply signal to the controller connected to the output terminal of the second isolation voltage conversion module 72.
The third isolation voltage conversion module 73 is configured to receive the power supply signal, and perform voltage conversion on the power supply signal, so that the third isolation voltage conversion module 73 generates a negative reference signal;
the coil winding module 71 is coupled with the second isolation voltage conversion module 72, the coil winding module 71 is connected with the controller, the coil winding module 71 is used for receiving a power supply signal and the third isolation voltage conversion module 73 generates a negative reference signal, and the negative reference signal is obtained through coupling; wherein, the negative power supply signal and the negative reference signal are both used for providing the controller to generate the driving signal.
The power supply signal in this embodiment may be a commercial power ac signal or a signal obtained by processing a commercial power ac signal, and a specific process of processing the commercial power ac signal may be as shown in fig. 6.
Through the power supply structure provided by the embodiment, the negative power supply signal and the negative reference signal can be output to the controller, so that the controller can drive the lamp area to work in a negative pressure driving mode, and the positive power supply signal can be provided for the controller to enable the controller to work.
In the embodiments shown in fig. 5 and 7, a manner is provided that, in the negative voltage driving mode, the negative power supply signal can be provided to the light-emitting driving module after the coil winding is coupled and connected to the isolated voltage conversion module. In this power supply mode, the power supply circuit configuration in the display device has two different connection modes as shown in fig. 5 and 7.
In some embodiments, to output a negative supply signal and a negative reference signal to the controller, the embodiments of the present application provide a fourth configuration of the power supply. Fig. 8 is a schematic structural diagram of a fourth power supply according to an embodiment of the present application. As shown in fig. 8, the power supply structure of the present application is applicable to the first power supply in fig. 1. Wherein the first power supply includes: a voltage step-down module 81, a first voltage conversion module 82, and a second voltage conversion module 83.
And the first voltage conversion module 82 is configured 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 the output terminal of the positive power supply signal to supply power to the controller.
And the second voltage conversion module 83 is configured 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 and the voltage reduction module 81 connected to the negative reference signal.
The first input end of the voltage reduction module 81 is connected with the second voltage conversion module 83, the second input end of the voltage reduction module 81 is grounded, and the voltage reduction module 81 is used for outputting a negative power supply signal based on a negative reference signal generated by the second voltage conversion module 83 and outputting the negative power supply signal to a controller connected with the voltage reduction module 81; the negative power supply signal and the negative reference signal are used for providing the controller with a driving signal to drive the lamp region to operate, and the voltage reduction module 81 may be implemented by some voltage reduction circuits, such as a DC-DC converter like a Buck circuit, and may also be implemented by a Low Dropout Regulator (LDO).
In some embodiments, in order to output a negative supply signal and a negative reference signal to the controller, the embodiments of the present application provide a fifth power supply structure. Fig. 9 is a schematic structural diagram of a fifth power supply according to an embodiment of the present application. As shown in fig. 9, the power supply structure of the present application is applicable to the second power supply in fig. 1. Wherein the second power supply includes: a voltage step-down module 91 and a third voltage conversion module 92;
the third voltage conversion module 92 is configured to receive the power supply signal, perform voltage conversion on the power supply signal to obtain a negative reference signal, and provide the negative reference signal to the voltage reduction module 91 connected to the negative reference signal;
a first input end of the voltage reduction module 91 is connected with the third voltage conversion module 92, a second input end of the voltage reduction module is grounded, and the voltage reduction module 91 is used for outputting a negative power supply signal based on a negative reference signal generated by the third voltage conversion module 92 and is connected with a controller connected with an output end of the third voltage conversion module 92; the negative power supply signal and the negative reference signal are used for providing the controller with a driving signal to generate a driving signal for driving the lamp region to operate, and the voltage reducing module 91 may be implemented by some voltage reducing circuits, such as a DC-DC converter like a Buck circuit, and may also be implemented by a Low Dropout Regulator (Low drop out Regulator, abbreviated as LDO). In the embodiments shown in fig. 8 and 9, another power supply mode of the controller is provided in the negative voltage driving mode, that is, the controller is powered by the voltage reduction circuit or the low dropout regulator, and based on this power supply mode, the power supply in the display device has two different circuit connection modes as shown in fig. 8 and 9. Compared with a power supply mode by adding a coil winding, the power supply method is suitable for the situation that the negative reference voltage is set to be low enough, and can directly utilize a voltage reduction circuit or a low-dropout linear regulator to carry out voltage reduction operation to obtain a negative power supply signal. Moreover, when adding winding modules is inconvenient, the device provided by the embodiment is easier to realize.
In some embodiments, the controller of the display device includes a main board, a microprocessor, and a plurality of constant current driving modules (e.g., a plurality of integrated constant current chips, IC chips), where the microprocessor module is connected to the main board and the plurality of constant current driving modules, respectively, and is configured to parse a control signal transmitted from the main board and send the parsed control signal to the plurality of constant current driving modules, and the microprocessor module is further connected to any one of the plurality of power supplies, so that the power supply is supplied by any one of the plurality of power supplies. The constant current driving modules are connected with corresponding power supplies, and provide negative reference signals and negative power supply signals based on the negative reference signals for the constant current driving modules through the power supplies; and the constant current driving modules are also connected with the negative terminals of the corresponding lamp areas and used for providing driving signals for the corresponding lamp areas, wherein the constant current driving modules are connected with the lamp areas in a one-to-one correspondence manner. Namely, the constant current driving module provides driving signals for the corresponding lamp zones by receiving the negative reference signals and the negative power supply signals and according to the control signals, the negative reference signals and the negative power supply signals analyzed by the microprocessor. In addition, since the ground reference of the motherboard is ground and the ground reference of the constant current driving module in the light emitting driving module is a negative reference signal generated by its corresponding power supply in the negative voltage driving mode, an isolation device is required to be provided so that signals between the motherboard and the light emitting driving module can be normally transmitted.
Further, fig. 10 is a schematic diagram of an isolation structure in a negative voltage driving mode according to an embodiment of the present disclosure (taking two power supplies, a power supply a and a power supply b as an example, where the power supply a is a first power supply and the power supply b is a second power supply). When the reference ground of the microprocessor is a negative reference signal generated by the power supply, at this time, since the reference ground of the main board is ground, a first isolation module needs to be arranged between the main board and the light-emitting driving module, that is, the main board is connected with the microprocessor in the light-emitting driving module through the first isolation module. The first isolation module is used for carrying out level conversion on a control signal generated by the mainboard and sending the obtained control signal to the microprocessor for analysis, so that normal transmission of the signal between the mainboard and the microprocessor is ensured, and the phenomenon that the signal cannot be normally transmitted due to interference caused by different reference places between the mainboard and the microprocessor is avoided.
In one example, in the first isolation module, for high frequency signals (e.g., clock signals, synchronization signals, etc.), two reference grounds may be isolated using capacitive isolation devices or magnetic isolation devices, while for low frequency signals (e.g., chip select signals), it may be implemented directly through non-isolated level shifting circuitry. Specifically, when the connection is made, the output signal of the main board is connected to the input terminals of the isolation device and the level shift circuit in the first isolation module, respectively, and the output terminals of the isolation device and the level shift circuit in the first isolation module are connected to the microprocessor module. And IC chip a is connected with the negative terminal of lamp area a, IC chip b is connected with the negative terminal of lamp area b, and the positive terminals of lamp area a and lamp area b are all grounded. The connection of lamp zones a and b is not shown in fig. 10.
In addition, in fig. 10, when the negative reference voltages generated by the power supply a and the power supply b are different, that is, the negative reference voltage provided by the power supply a to the microprocessor and the IC chip a is the same reference ground, but the negative reference voltage provided by the power supply b to the IC chip b is another reference ground, the reference grounds of the two negative reference signals are different, so that a first isolation module, which is not shown in fig. 10, still needs to be arranged between the microprocessor and the IC chip b.
In some embodiments, fig. 11 is a schematic structural diagram of another isolation manner in a negative voltage driving mode according to an embodiment of the present disclosure (taking two power sources as an example, the two power sources are a power source a and a power source b, and the power source a and the power source b correspond to the lamp area a and the lamp area b, respectively). The microprocessor is grounded and used for analyzing a control signal generated by the mainboard;
when the reference ground of the microprocessor is the same as the main board, at this time, because the reference ground between the microprocessor and the two constant current driving modules in the figure is different, two second isolation modules are arranged at this time, wherein the second isolation modules are used for performing level conversion on the control signal analyzed by the microprocessor and sending the converted control signal to the corresponding constant current driving modules, and the second isolation modules correspond to the constant current driving modules one to one. And the constant current driving module receives the negative reference signal and the negative power supply signal and provides a driving signal for the corresponding lamp area according to the converted control signal, the negative reference signal and the negative power supply signal.
Specifically, the input ends of the two second isolation modules may be connected to the microprocessor, the output ends of the two second isolation modules are respectively connected to the input ends of the corresponding constant current driving modules (i.e., are respectively connected to the IC chip a and the IC chip b), and the signals analyzed by the microprocessor are subjected to level conversion by the two second isolation modules and then sent to the corresponding constant current driving modules. And in fig. 11, power supplies a and b provide respective negative reference signals and negative power supply signals based on the respective negative reference signals for IC chip a and IC chip b, respectively. In the second isolation module, for high-frequency signals (such as clock signals, synchronous signals and the like), two reference grounds can be isolated by adopting a capacitive isolation device or a magnetic isolation device, and for low-frequency signals (such as chip selection signals), the isolation can be directly realized by a non-isolated level conversion circuit.
The apparatuses shown in fig. 10 and 11 are schematic structural diagrams of two different isolation manners in the negative pressure driving manner provided by the present application, and through the two different isolation manners, it is ensured that signals can be transmitted between different reference grounds, and electromagnetic interference of signals caused by different reference grounds is avoided.
In some embodiments, the display device further includes a plurality of switches, and the power supplies are in one-to-one correspondence with the switches. And a plurality of power supplies can be connected through a switch. Wherein, one connection mode is as follows: the power supply for supplying power to the main board is used as a main power supply, the rest of power supplies can be connected to the filter module in the main power supply through the corresponding switch, and the switch can be controlled through a switch indication signal, and specifically the switch control signal is sent by the main board.
Fig. 12 is a schematic circuit diagram of a negative-voltage-driven backlight module under control of multiple power supplies according to an embodiment of the present disclosure. In fig. 12, two power supplies are taken as an example, the power supply 1 provides a positive power supply signal for the motherboard, and the receiving module of the power supply 2 is connected to the filtering module of the power supply 1 through the switch device, and then the switch device is controlled to be turned on and off through the SW control signal sent through the motherboard.
The power supply 1 is also powered in the same manner as shown in fig. 7 of the present application. The structure of the power supply 2 is the same as that of the power supply 9 provided in the present application, and the power supply 1 and the power supply 2 are both provided with a module for processing the commercial power alternating current, except that the power factor correction module and the voltage conversion module are integrated on one chip in fig. 12. And, power 1 still provides negative reference signal and negative power supply signal for IC chip 1, power 2 provides negative reference signal and negative power supply signal for IC chip 2, each IC chip all corresponds and connects a second isolation module, be connected with microprocessor module through corresponding second isolation module, make microprocessor send the control signal analysis back that microprocessor sent microprocessor with the mainboard for IC chip, later IC chip sends drive signal to corresponding lamp area according to negative power supply signal and the negative reference signal that corresponding power provided, make corresponding lamp area light.
In the circuit diagram shown in fig. 12, the reference grounds of the 3 signals shown by reference numerals 131, 132, and 133 are the same reference ground. The reference grounds shown by reference numerals 134, 135, 136 are the same reference ground, and the reference numeral 131 is different from the reference ground of reference numeral 134.
In the circuit schematic diagram of the negative-pressure-driven backlight module under the control of multiple power supplies in the embodiment, different floating ground designs are performed for different lamp zones and different power supplies, that is, different reference grounds are selected, so that one-to-one correspondence between the lamp zones and the power supplies can be ensured, the power consumption requirements of the different lamp zones can be met by the multiple power supplies, and the problem of insufficient power caused by overlarge lamp zones is solved.
In addition, under the negative pressure drive mode, when the connecting wire at the positive terminal of lamp district was replaced through the backplate to needs, metal sheet or plastic-aluminum board can be chooseed for use to the backplate. When selecting and using the plastic-aluminum board as the backplate, because the plastic-aluminum board intermediate structure is the insulating layer, consequently lamp strip in the lamp district is when through backplate ground connection, the problem of disconnection in the middle of appearing very easily, leads to the circuit connection unstability in the whole backlight unit, consequently can extra addition rivet or screw this moment in the plastic-aluminum board, through rivet or screwed connection plastic-aluminum board both sides, guarantee that the lamp district can not break off when through backplate ground connection.
The embodiment of the application also discloses a display control method which is applied to the display device. Fig. 13 is a flowchart illustrating a display control method according to the present application.
As shown in fig. 13, the method includes, step 101, determining whether it is currently in a standby mode.
And 102a, if the current state is in the standby mode, controlling the first power supply to work and controlling the second power supply to be closed.
And step 102b, if the power supply is in the non-standby mode, controlling the first power supply and the second power supply to work.
For example, in the above display device, a first power supply connected to the controller may be first turned on so that the power supply may provide a positive power supply signal to the main board. The controller can receive a control instruction of a user for the display device and determine whether the current display device is in a standby mode. For example, the controller may receive an operation of a user on a power button on the display device and an operation of starting the display device button, and if the user does not start the display device after turning on the power button of the display device, it indicates that the current display device is in a standby mode; if the user continues to start the display device through the button after turning on the power button, it indicates that the current display device is in the non-standby mode. After determining the current mode, the controller controls an operating state of the power supply in the display apparatus. That is, when the display device is currently in the standby mode, the controller may control the second power supply to be turned off, while the first power supply continues to operate; 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.
For example, each power supply may be provided with a switching device, and the switching device may be configured to receive a switching control signal sent by the controller to control the power supply to start or stop operating. In this embodiment, the controller controls the power supply of the display device to be turned on and off in the standby mode and the non-standby mode, so that 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.
In some embodiments, the negative supply signal and the negative reference signal provided by the plurality of power sources are further matched to the power of the light emitting elements in the corresponding lamp zones; that is, before step 101, all the light emitting elements of the backlight module need to be divided according to the rule that the light emitting elements with the same power belong to the same lamp zone, so as to obtain a plurality of lamp zones.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (10)

1. A display device, comprising: a backlight module and a display panel; the backlight module comprises a plurality of power supplies, a controller and lamp areas corresponding to the power supplies;
the controller is connected to the plurality of power sources and the plurality of light zones; the plurality of power supplies include a first power supply for providing a positive power supply signal to the controller and driving the lamp region, and a second power supply for driving the lamp region;
the plurality of power supplies output a negative supply signal and a negative reference signal; the controller outputs a driving signal in a negative pressure driving mode based on the received control signal, the negative power supply signal and the negative reference signal; the driving signal is used for driving the lamp area corresponding to the selected power supply to emit light, and the light emitted by the lamp area is projected to the display panel to provide backlight for the display panel;
the controller controls the first power supply to work and controls the second power supply to be turned off in a standby mode, and controls the first power supply and the second power supply to work in a non-standby mode.
2. The apparatus of claim 1, wherein the second power source comprises: the transformer comprises a coil winding module and a first isolation voltage transformation module;
the coil winding module is coupled with the first isolation voltage conversion module and is connected with the lamp area through a controller; the first isolation voltage conversion module is used for receiving a power supply signal, performing voltage conversion and outputting a negative reference signal; the coil winding module receives a power supply signal and the negative reference signal and couples the power supply signal and the negative reference signal to obtain a negative power supply signal;
wherein the negative supply signal and the negative reference signal are used to provide the controller with a generated drive signal.
3. The apparatus of claim 1, wherein the first power source comprises: the transformer comprises a coil winding module, a second isolation voltage conversion module and a third isolation voltage conversion module;
the second isolation voltage conversion module receives a power supply signal, and the output end of the second isolation voltage conversion module is connected with the controller; the coil winding module is coupled with the second isolation voltage conversion module and is connected with the lamp area through a controller; the third isolation voltage conversion module receives a power supply signal;
the second isolation voltage conversion module is used for performing voltage conversion on a power supply signal to obtain a positive power supply signal, and the positive power supply signal is used for being provided for the controller; the third isolation voltage conversion module is used for performing voltage conversion on the power supply signal to obtain a negative reference signal; the coil winding module is used for receiving a power supply signal and the negative reference signal and coupling to obtain a negative power supply signal;
wherein the negative supply signal and the negative reference signal are used to provide the controller with a generated drive signal.
4. The apparatus of claim 1, wherein the first power source comprises: the voltage reduction module, the first voltage conversion module and the second voltage conversion module;
the first voltage conversion module receives a power supply signal, and the output end of the first voltage conversion module is connected with the controller; the second voltage conversion module receives a power supply signal; the first input end of the voltage reduction module is connected with the second voltage conversion module, the second input end of the voltage reduction module is grounded, and the output end of the voltage reduction module is connected with the lamp area through the controller;
the first voltage conversion module performs voltage conversion on a power supply signal to obtain a positive power supply signal, and the positive power supply signal is used for being provided for the controller; the second voltage conversion module performs voltage conversion on the power supply signal to obtain a negative reference signal; the voltage reduction module outputs a negative power supply signal based on the negative reference signal generated by the second voltage conversion module;
wherein the negative supply signal and the negative reference signal are used to provide the controller with a generated drive signal.
5. The apparatus of claim 1, wherein the second power source comprises: the voltage reduction module and the third voltage conversion module;
the third voltage conversion module receives a power supply signal; the first input end of the voltage reduction module is connected with the third voltage conversion module, the second input end of the voltage reduction module is grounded, and the output end of the voltage reduction module is connected with the lamp area through the controller;
the third voltage conversion module is used for performing voltage conversion on the power supply signal to obtain a negative reference signal; the voltage reduction module is used for outputting a negative power supply signal based on the negative reference signal generated by the third voltage conversion module;
wherein the negative supply signal and the negative reference signal are used to provide the controller with a generated drive signal.
6. The apparatus of any one of claims 1-5, wherein the controller comprises: the constant current driving circuit comprises a mainboard, a microprocessor and a plurality of constant current driving modules; a first isolation module is connected between the mainboard and the microprocessor;
the microprocessor is respectively connected with a first power supply and the constant current driving modules; the plurality of power supplies are connected with the corresponding constant current driving modules; the plurality of constant current driving modules are connected with the plurality of lamp areas in a one-to-one corresponding manner;
the first isolation module is used for carrying out level conversion on a control signal generated by the mainboard and sending the obtained control signal to the microprocessor for analysis;
the constant current driving module receives a negative reference signal and a negative power supply signal, and generates and provides a driving signal for a corresponding lamp area according to the control signal analyzed by the microprocessor, the negative reference signal and the negative power supply signal.
7. The apparatus of any one of claims 1-5, wherein the controller comprises: the constant current driving circuit comprises a main board, a microprocessor connected with the main board and a plurality of constant current driving modules; the device also comprises a plurality of second isolation modules, wherein the second isolation modules correspond to the constant current driving modules one to one; the constant current driving modules are connected with the microprocessor through corresponding second isolation modules;
the microprocessor is grounded and is used for analyzing a control signal generated by the mainboard;
the second isolation module is used for carrying out level conversion on the control signal analyzed by the microprocessor and sending the converted control signal to the corresponding constant current driving module;
and the constant current driving module receives a negative reference signal and a negative power supply signal, and generates and provides a driving signal for a corresponding lamp area according to the converted control signal, the negative reference signal and the negative power supply signal.
8. The device of any one of claims 1-5, further comprising a back plate; the high-level ends of the plurality of lamp areas are all grounded through the back plate.
9. A display control method applied to the display device according to any one of claims 1 to 8, comprising:
determining whether the mobile terminal is currently in a standby mode;
if the current power supply is in the standby mode, controlling the first power supply to work and controlling the second power supply to be closed;
and if the current mode is in the non-standby mode, controlling the first power supply and the second power supply to work.
10. The method of claim 9, wherein the plurality of power sources provide negative power supply signals and negative reference signals that match the power of light emitting elements in corresponding lamp zones; before the determining whether the current state is in the standby mode, the method further includes:
and dividing all the light-emitting elements of the backlight module according to the rule that the light-emitting elements with the same power belong to the same lamp area to obtain a plurality of lamp areas.
CN202110177726.2A 2020-03-18 2021-02-07 Display device and display control method Active CN114913817B (en)

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CN202110177726.2A CN114913817B (en) 2021-02-07 2021-02-07 Display device and display control method
PCT/CN2021/080257 WO2021185150A1 (en) 2020-03-18 2021-03-11 Display apparatus and display control method
PCT/CN2021/095347 WO2022041873A1 (en) 2020-08-24 2021-05-21 Display apparatus and step power circuit
US17/660,786 US11783788B2 (en) 2020-03-18 2022-04-26 Display apparatus and display control method
US17/900,166 US11825577B2 (en) 2020-08-24 2022-08-31 Display apparatus and step power circuit
US18/460,875 US20230419916A1 (en) 2020-03-18 2023-09-05 Display apparatus and display control method

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