CN114913817B - Display device and display control method - Google Patents
Display device and display control method Download PDFInfo
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- CN114913817B CN114913817B CN202110177726.2A CN202110177726A CN114913817B CN 114913817 B CN114913817 B CN 114913817B CN 202110177726 A CN202110177726 A CN 202110177726A CN 114913817 B CN114913817 B CN 114913817B
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- 238000010168 coupling process Methods 0.000 claims description 4
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- 238000010586 diagram Methods 0.000 description 28
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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
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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
- G09G3/3413—Details of control of colour illumination sources
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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 areas corresponding to the power supplies, wherein the power supplies comprise a first power supply for providing positive power supply signals for the controller and driving the lamp areas, and a second power supply for driving the lamp areas. In addition, the controller in the backlight module is powered by the first power supply, and in addition, the lamp area sends a driving signal for the lamp area corresponding to the power supply according to the negative reference signal and the 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. By the display device powered by the multiple power supplies, the power supply does not need to bear excessive light-emitting elements, and negative pressure driving 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
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 to emit uniform light to the display panel, so that a clear image can be displayed on the display panel.
In general, a backlight device is provided with a light-emitting driving device for supplying a driving signal to a light-emitting element in the backlight device, for example, a light-emitting device such as an LED, so that the light-emitting device emits uniform light.
However, with the increasing size of the screen display panel, the corresponding backlight device consumes power, so that the driving signal cannot meet the power requirement of the backlight device, resulting in dimming of the screen display panel or distortion of the screen display image, and affecting the user experience.
Disclosure of Invention
The application provides a display device and a display control method, and solves the problem of insufficient power supply of a backlight module in the existing display device.
In a first aspect, the present application provides a display device, including: 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 signals and a plurality of power supplies, and outputs a driving signal in a negative pressure driving mode to drive a 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 application, the second power supply is configured such that the second power supply includes: a coil winding module and a first isolated voltage conversion module; the coil winding module is coupled with the first isolated voltage conversion module and is connected with the lamp area through the controller; the first isolation voltage conversion module is used for receiving the power supply signal, converting the voltage and outputting a negative reference signal; the coil winding module receives a power supply signal and a negative reference signal, and is coupled to obtain a negative power supply signal; wherein the negative power supply signal and the negative reference signal are used for providing the controller to generate the driving signal.
In some embodiments of the present application, a first power supply is configured to include: the coil winding module, the second isolation voltage conversion module and the 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 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 carrying out voltage conversion on the power supply signal to obtain a positive power supply signal and providing the positive power supply signal to the controller; the third isolation voltage conversion module is used for carrying out 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 a negative reference signal and coupling to obtain a negative power supply signal; wherein the negative power supply signal and the negative reference signal are used for providing the controller to generate the driving signal.
In some embodiments of the present application, the first power supply is further configured such that the first power supply includes: the device comprises a voltage reduction module, a first voltage conversion module and a 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 the 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, wherein 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 reducing 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 for providing the controller to generate the driving signal.
In some embodiments of the application, the second power supply is further configured to include: a step-down module and a third voltage conversion module; the third voltage conversion module receives the power supply signal; the first input end of the voltage reducing module is connected with the third voltage conversion module, the second input end of the voltage reducing module is grounded, and the output end of the voltage reducing module is connected with the lamp area through the controller; the third voltage conversion module is used for carrying out voltage conversion on the power supply signal to obtain a negative reference signal; the step-down 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 power supply signal and the negative reference signal are used for providing the controller to generate the driving signal.
In some embodiments of the application, the controller comprises: the device comprises a main board, a microprocessor and a plurality of constant current driving modules; a first isolation module is connected between the main board and the microprocessor; the microprocessor is respectively connected with the first power supply and the constant current driving modules; the power supplies are connected with the corresponding constant current driving modules; the constant current driving modules are connected with the lamp areas in a one-to-one correspondence manner; the first isolation module is used for carrying out level conversion on control signals generated by the main board and sending the obtained control signals 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 driving signals 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 application, the controller comprises: the device 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, and the second isolation modules are in one-to-one correspondence with the constant current driving modules; the constant current driving modules are connected with the microprocessor through corresponding second isolation modules; the microprocessor is grounded and used for analyzing a control signal generated by the main board; 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; the constant current driving module receives the negative reference signal and the negative power supply signal, and generates and provides driving signals 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 application, the device further comprises a back plate; the high-level ends of the lamp areas are grounded through the backboard.
In a second aspect, the present application provides a display control method applied to any one of the display devices of the first aspect, the control method comprising: determining whether the current standby mode is in; if the power supply is in the standby mode currently, controlling the first power supply to work and controlling the second power supply to be turned off; and if the first power supply and the second power supply are in the non-standby mode currently, controlling the first power supply and the second power supply to work.
In some embodiments of the present application, the negative power supply signals and the negative reference signals provided by the plurality of power supplies match the power of the light emitting elements in the corresponding light zones; determining whether to be in standby mode currently, further comprises: 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.
The application provides a display device and a display control method, which provide backlight for a display panel by adopting a backlight module powered by multiple power supplies, namely the backlight module in the application comprises a plurality of power supplies which respectively correspond to different lamp areas. And the plurality of power supplies includes a first power supply for providing a positive power signal to the controller and driving the lamp area, and a second power supply for driving only the lamp area. When the backlight module works, the controller in the backlight module is powered by a first power supply of the plurality of power supplies, and the lamp area sends driving signals for the lamp area corresponding to the power supply according to negative reference signals 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 an operating state. By adopting the display device powered by the multiple power supplies, namely the backlight module is powered by the multiple power supplies, the driving of the whole lamp area of the backlight module can be completed without the need of burdening excessive light-emitting elements for a single power supply, thereby avoiding the problems that when the lamp area in the backlight module is larger, the backlight module cannot provide required power and finally causes image distortion and the like displayed by a display panel.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the 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 application;
fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the application;
FIG. 3 is a schematic diagram illustrating a current flow in a lamp area according to an embodiment of the present application;
FIG. 4 is a schematic diagram of another lamp area current flow according to an embodiment of the present application;
Fig. 5 is a schematic structural diagram of a power supply according to an embodiment of the present application;
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 of 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 mode in a negative pressure driving mode according to an embodiment of the present application;
FIG. 11 is a schematic diagram of an isolation mode in another negative pressure driving mode according to an embodiment of the present application;
Fig. 12 is a schematic circuit diagram of a negative-pressure driven backlight module under multi-power control according to an embodiment of the application;
fig. 13 is a schematic flow chart of a display control method provided by the application.
Specific embodiments of the present application have been shown by way of the above drawings and will be described in more detail below. The drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but rather to illustrate the inventive concepts to those skilled in the art by reference to the specific embodiments.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the accompanying claims.
The following describes the application scenario according to the present application and problems in the prior art.
Currently, in order to facilitate people to acquire information, screens of various electronic products are also becoming larger and larger, such as mobile phones, computers, televisions and the like. However, as the display panels of various display devices are larger and larger, more light emitting elements are needed to be additionally arranged in the electronic products correspondingly, and driving signals are provided for the light emitting devices according to the power required by the light emitting elements through a power supply or a driving device, so that enough light can be provided for the display screen for the light emitting devices, and information required by users can be clearly displayed on the display screen.
For example, a display device generally includes a backlight module and a display panel, wherein the backlight module may be provided with a power supply, a motherboard, a light emitting device, and a light emitting driving device corresponding to the light emitting device. The power supply can supply power for the main board and the light-emitting driving device, so that the main board receives image signals transmitted by an external server or optical fibers and the like, and the control signals are transmitted to the light-emitting driving device through the processing of the image signals by the controller on the main board, 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 application provides a display device and a display control method, which aim to solve the technical problems in the prior art.
The following describes the technical scheme of the present application and how the technical scheme of the present application solves the above technical problems in detail with specific embodiments. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail 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 application, where, 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 lamp areas corresponding to the power supplies; among the plurality of power supplies, two types of power supplies are included, 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 a lamp area corresponding to the first power supply to work. The other type of power supply is a second power supply, and the second power supply is used for driving a lamp area corresponding to the second power supply to work. It should be noted that, the correspondence between the power supply and the lamp area in this embodiment may be that one power supply corresponds to a plurality of lamp areas, or may be that one power supply corresponds to one lamp area; 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 application emits light by receiving the driving signal generated by the controller, wherein the driving signal generated by the controller is generated by a negative pressure driving mode, and specifically, the plurality of power supplies are used for outputting 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 supply.
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 be turned off in the standby mode. In the non-standby mode, both the first power supply and the second power supply are in an operating state by controlling.
In an example, fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the application. As shown in fig. 2, only two power supplies and two lamp areas are taken as an example in fig. 2, and one power supply corresponds to one lamp area, power supply a corresponds to lamp area a, and power supply b corresponds to lamp area b. The power supply a is a 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, the negative power supply signal 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 provided by the power supply b, the power supply signal and the control signal generated by the controller through an external instruction.
In this embodiment, the multiple power supplies drive the lamp area corresponding to the power supply through the controller, so that the problem that the existing device cannot meet the power consumption requirement of the lamp area due to the fact that the power required by the lamp area is continuously increased can be avoided, and further the display interface of the display device is caused to be problematic, and the use of a user is affected.
Fig. 3 is a schematic diagram of a lamp area current flow according to an embodiment of the present application, wherein a driving mode of the controller is a conventional positive voltage driving mode. In fig. 3, taking power supply b and lamp area b as an example, the current of lamp area b starts from corresponding power supply b corresponding to lamp area b, and a current loop is formed by the controller, the positive terminal of lamp area b, the negative terminal of lamp area b, and the controller returning to corresponding power supply b. The power supply b supplies a positive power signal to the light-emitting driving module. Fig. 3 only shows a schematic diagram of current flow between any one of the multiple power supplies and its corresponding lamp area, and the current flow loops between the other power supplies and their corresponding lamp areas are the same, and the dashed lines in fig. 3 only represent current flow, and do not represent actual connection lines.
Further, in the embodiment shown in fig. 1, the mode in which the controller drives the lamp area to operate is a negative pressure driving mode. In this mode, the positive terminal of each lamp area is grounded, and the negative terminal of each lamp area is connected to the light-emitting driving module. The controller can be connected with a first power supply in the multiple power supplies, and the first power supply provides positive electricity for the controller; in addition, the controller and the plurality of power supplies are connected, and at the moment, 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 light area may be connected to ground through the back plate after being connected to the back plate, wherein the light areas may be electrically connected to the back plate by screws.
Fig. 4 is a schematic diagram of another current flow direction of a lamp area according to an embodiment of the present application, wherein a driving mode of driving the lamp area by the controller is a negative pressure driving mode. In fig. 4, taking power b and light b as an example, the current of light b starts from the corresponding power b corresponding to light b, and returns to the corresponding power b through the back plate, the positive terminal of light b, the negative terminal of light b, and the controller. And in this process, the power supply signal provided by the power supply b to the light-emitting driving module is a negative power supply signal. In fig. 4, only the current flow between any one of the multiple power supplies and its corresponding lamp area is shown in the negative-pressure driving mode, the current flow loops between the other power supplies and their corresponding lamp areas are the same, and the dotted lines in fig. 4 only represent the current flow, and do not represent the actual connection lines.
In the embodiment of the application, the lamp area driving mode in the display device is a negative pressure driving mode compared with the display device in a positive pressure driving mode, and 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 number of connecting wires between the lamp area and the controller and the number of connectors of the connecting wires can be reduced, so that the area of the circuit board occupied by the controller can be reduced.
In some embodiments, embodiments of the present application provide a configuration of a power supply in order to output a negative power supply signal as well as a negative reference signal to a controller. 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.
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 isolated voltage conversion module 42 is configured to receive the power supply signal, perform voltage conversion on the received power supply signal, and 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 couple to obtain a negative power supply signal after receiving the power supply signal and the negative reference signal generated by the first isolated voltage conversion module 42, and provide the negative power supply signal to the controller; wherein the negative power supply signal and the negative reference signal are used for providing the controller to generate the driving signal.
In one example, the power supply signal received by the first isolated voltage conversion module 42 is mains.
In one example, the power supply signal received by the first isolated voltage conversion module 42 is a power supply signal processed for utility power. Specifically, when the commercial alternating current (100V-240V, 50-60 Hz) is processed, the processing procedure comprises: filtering, rectifying, and power factor correction. The second power supply can also comprise a filtering module, a filtering rectification 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, where the filtering module 51 filters the received mains, such as high frequency filtering, etc., in some embodiments, the filtering module 51 may not be provided.
The filtering rectification module 52 then performs filtering rectification on the filtered signal to convert the received ac wave signal into a full wave signal. After the processing of the filtering rectification module 52, the power supply signal generated by the filtering rectification module 52 is subjected to phase adjustment by the power factor correction module 53, so that the phases of the current and the voltage are the same, the power factor of the power supply can be effectively improved, and the power factor correction module 53 can be omitted in some embodiments.
The power factor correction module 53 then provides the corrected supply signal to the coil winding module 41 and the first isolated voltage conversion module 42.
With the power supply structure provided by the above embodiment, the negative power supply signal and the 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 work in a negative pressure driving mode.
In some embodiments, to output a negative power supply signal as well as a negative reference signal to the controller, embodiments of the present application provide a third configuration of power supply. 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 comprises: a coil winding module 71, a second isolated voltage conversion module 72, and a third isolated voltage conversion module 73;
the second isolated voltage transformation module 72 is configured to receive the power supply signal and to cause the second isolated voltage transformation module 72 to generate a positive power supply signal by voltage transforming the power supply signal and to provide the positive power supply signal to a controller coupled to an output of the second isolated voltage transformation module 72.
The third isolated voltage transformation module 73 is configured to receive the power supply signal, and perform voltage transformation on the power supply signal, so that the third isolated voltage transformation module 73 generates a negative reference signal;
The coil winding module 71 is coupled to the second isolated voltage conversion module 72, and the coil winding 71 module is connected to the controller, and the coil winding module 71 is configured to receive the power supply signal and the third isolated voltage conversion module 73 generates a negative reference signal, and the negative reference signal is obtained by coupling; wherein, negative power supply signal and negative reference signal are used for providing the controller and generating the drive signal.
The power supply signal in this embodiment may be a commercial ac signal or a signal after processing the commercial ac signal, and the specific commercial ac signal processing process may be seen 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 also be provided for the controller to enable the controller to work.
In the embodiments shown in fig. 5 and 7 described above, a manner is provided in which a negative power supply signal can be provided to the light emitting driving module by coupling the coil winding with the isolated voltage conversion module in the negative-pressure driving mode. In this power supply mode, the power supply circuit structure in the display device has two different connection modes as shown in fig. 5 and 7.
In some embodiments, in order to output a negative power supply signal and a negative reference signal to the controller, embodiments of the present application provide a fourth configuration of 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 step-down module 81, a first voltage conversion module 82, and a second voltage conversion module 83.
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 a controller connected to an output end of the positive power supply signal to supply power to the controller.
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 buck module 81 connected thereto.
The first input end of the voltage reducing module 81 is connected with the second voltage converting module 83, the second input end of the voltage reducing module 81 is grounded, and the voltage reducing module 81 is used for outputting a negative power supply signal based on a negative reference signal generated by the second voltage converting module 83 and outputting the negative power supply signal to a controller connected with the negative power supply signal; the negative power supply signal and the negative reference signal are used for providing the controller with a driving signal to drive the lamp area to work, and the step-down module 81 can be implemented by some step-down circuits, such as a DC-DC converter like a Buck circuit, and also can be implemented by a low dropout linear regulator (Low Dropout Regulator, LDO for short).
In some embodiments, to output a negative power supply signal as well as a negative reference signal to the controller, embodiments of the present application provide a fifth configuration of power supply. 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 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 buck module 91 connected thereto;
The first input end of the voltage reducing module 91 is connected with the third voltage converting module 92, the second input end of the voltage reducing module is grounded, and the voltage reducing module 91 is used for outputting a negative power supply signal based on a negative reference signal generated by the third voltage converting module 92 and a controller connected with the output end of the third voltage converting module 92; the negative power supply signal and the negative reference signal are used for providing the controller with a driving signal to drive the lamp area to work, and the step-down module 91 may be implemented by some step-down circuits, such as a DC-DC converter like a Buck circuit, and may also be implemented by a low dropout linear regulator (Low Dropout Regulator, LDO for short). In the embodiments shown in fig. 8 and 9 described above, there is provided another power supply mode of the controller in the negative pressure driving mode, that is, the controller is supplied with power by a step-down circuit or a low dropout linear regulator, and based on this power supply mode, the power supply in the display apparatus has two different circuit connection modes as shown in fig. 8 and 9. Compared with a power supply mode of 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 the voltage reduction circuit or the low-dropout linear voltage regulator can be directly utilized for voltage reduction operation to obtain a negative power supply signal. Moreover, when the winding module is inconvenient to add, 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 (for example, a plurality of integrated constant current chips, IC chips), where the microprocessor module is respectively connected to the main board and the plurality of constant current driving modules, 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 multiple power supplies, so that the any one of the multiple power supplies power to the same. The constant current driving modules are connected with corresponding power supplies, and negative reference signals and negative power supply signals based on the negative reference signals are provided for the constant current driving modules through the power supplies; and the constant current driving modules are also connected with the negative wiring 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. The constant current driving module receives the negative reference signal and the negative power supply signal and provides driving signals 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 addition, in the negative pressure driving mode, the reference ground of the main board is the ground, and the reference ground of the constant current driving module in the light emitting driving module is the negative reference signal generated by the corresponding power supply, so that an isolation device is required to be arranged, and signals between the main board and the light emitting driving module can be normally transmitted.
Further, fig. 10 is a schematic diagram of an isolation mode structure in a negative-pressure driving mode according to an embodiment of the present application (taking two power sources, a power source a and b as examples, wherein the power source a is a first power source and the power source b is a second power source). When the reference ground of the microprocessor is a negative reference signal generated by the power supply, the reference ground of the main board is the ground, so that a first isolation module needs to be arranged between the main board and the light-emitting driving module at the moment, namely, 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 control signals generated by the main board, and sending the obtained control signals to the microprocessor for analysis, so that the signals between the main board and the microprocessor can be ensured to be normally transmitted, and the phenomenon that the signals cannot be normally transmitted due to interference caused by different reference grounds between the main board and the microprocessor is avoided.
In one example, in the first isolation module, a capacitive isolation device or a magnetic isolation device may be employed to isolate two references to ground for high frequency signals (e.g., clock signals, synchronization signals, etc.), and may be implemented directly by a non-isolated level shifting circuit for low frequency signals (e.g., chip select signals). Specifically, when in connection, the output signals of the main board are respectively connected with the isolation devices in the first isolation module and the input end of the level conversion circuit, and the output ends of the isolation devices in the first isolation module and the level conversion circuit are connected with the microprocessor module. And the IC chip a is connected with the negative terminal of the lamp area a, the IC chip b is connected with the negative terminal of the lamp area b, and the positive terminals of the lamp area a and the lamp area b are grounded. The manner of connection of lamp zone a to lamp zone b is not shown in fig. 10.
In addition, in fig. 10, when the negative reference voltages generated by the power source a and the power source b are different, that is, when the negative reference voltages provided by the power source a to the microprocessor and the IC chip a are the same reference ground, but the negative reference voltage provided by the power source 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, not shown in fig. 10, still needs to be provided between the microprocessor and the IC chip b.
In some embodiments, fig. 11 is a schematic structural diagram of an isolation mode in another negative-pressure driving mode according to an embodiment of the present application (two power sources are illustrated as a power source a and a power source b, which correspond to a lamp area a and a lamp area b, respectively). The microprocessor is grounded and used for analyzing a control signal generated by the main board;
when the reference ground of the microprocessor is the same as that of 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 carrying out level conversion on control signals analyzed by the microprocessor and sending the converted control signals to the corresponding constant current driving modules, and the second isolation modules are in one-to-one correspondence with the constant current driving modules. The constant current driving module receives the negative reference signal and the negative power supply signal and provides driving signals 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 can be connected with the microprocessor, the output ends of the two second isolation modules are respectively connected with the input ends of the corresponding constant current driving modules (namely, the two second isolation modules are respectively connected with the IC chip a and the IC chip b), and the signals analyzed by the microprocessor are subjected to level conversion and then sent to the corresponding constant current driving modules. And in fig. 11, power supply a, power supply b provide respective negative reference signals and negative power supply signals based on the respective negative reference signals for IC chip a, IC chip b, respectively. In the second isolation module, a capacitive isolation device or a magnetic isolation device may be used to isolate two references to ground for high frequency signals (e.g., clock signals, synchronization signals, etc.), and a non-isolated level shift circuit may be used directly for low frequency signals (e.g., chip select signals).
The devices shown in fig. 10 and fig. 11 are respectively schematic structural diagrams of two different isolation modes under the negative pressure driving mode provided by the application, and through the two different isolation modes, signal transmission between different reference grounds can be ensured, and electromagnetic interference caused by the difference of the reference grounds is avoided.
In some embodiments, the display device further includes a plurality of switches, and the power source corresponds to the switches one by one. And a plurality of power sources can be connected through a switch. One of the connection modes is as follows: the power supply for supplying power to the main board is used as a main power supply, the rest of the power supplies can be connected to a filtering module in the main power supply through a switch corresponding to the main power supply, the switch can control the main power supply through a switch indication signal, and the switch control signal is specifically sent by the main board.
Fig. 12 is a schematic circuit diagram of a negative-pressure driven backlight module under multi-power control according to an embodiment of the application. In fig. 12, two power supplies are taken as examples, the power supply 1 provides a positive power supply signal for the main board, and after the receiving module of the power supply 2 is connected to the filtering module of the power supply 1 through the switching device, the switching device is controlled to be turned on and off by the SW control signal, and the SW control signal is sent through the main board.
The power supply 1 is supplied in the same manner as shown in fig. 7 of the present application. The structure of the power supply 2 is the same as 9 provided by the application, and the power supply 1 and the power supply 2 are both provided with modules for processing commercial alternating current, except that the power factor correction module and the voltage conversion module are integrated on a chip in fig. 12. And, power 1 still provides negative reference signal and negative power supply signal for IC chip 1, and power 2 provides negative reference signal and negative power supply signal for IC chip 2, and every IC chip all corresponds to connect a second isolation module, is connected with microprocessor module through corresponding second isolation module for microprocessor can send the control signal analysis of mainboard to microprocessor back to the IC chip, and then the IC chip sends drive signal to corresponding lamp district according to negative power supply signal and negative reference signal that corresponding power provided, makes corresponding lamp district light.
In the circuit diagram shown in fig. 12, the reference grounds of the 3 signals indicated by reference numerals 131, 132, and 133 are the same reference ground. Reference numerals 134, 135, 136 are the same reference numeral, and 131 is different from 134.
In the circuit schematic diagram of the negative-pressure driven backlight module under the control of multiple power supplies shown in the above embodiment, different floating designs are performed for different lamp areas and different power supplies, that is, different reference grounds are selected, so that one-to-one correspondence between the lamp areas and the power supplies can be ensured, and the power consumption requirements of different lamp areas can be ensured by multiple power supplies, so that the problem of insufficient power caused by overlarge lamp areas is avoided.
In addition, in the negative pressure driving mode, when the connecting wire at the positive terminal of the lamp area needs to be replaced by the backboard, the backboard can be a metal plate or an aluminum plastic plate. When selecting the plastic-aluminum board as the backplate, because plastic-aluminum board intermediate structure is the insulating layer, consequently the lamp strip in the lamp district when grounding through the backplate, the problem of disconnection in the middle of very easily appearing leads to circuit connection in the whole backlight module unstable, consequently can extra interpolation rivet or screw in the plastic-aluminum board this moment, through rivet or screwed connection plastic-aluminum board both sides, guarantee that the lamp district can not break off when grounding through the backplate.
The embodiment of the application also discloses a display control method which is applied to the display device. Fig. 13 is a schematic flow chart of a display control method provided by the application.
As shown in fig. 13, the method includes a step 101 of determining whether it is currently in a standby mode.
Step 102a, if the power supply is currently in the standby mode, controls the first power supply to operate and controls the second power supply to be turned off.
Step 102b controls the first power supply and the second power supply to operate if the power supply is currently in the non-standby mode.
In the above display device, for example, the first power source connected to the controller may be turned on first so that the power source may provide a positive power signal to the main board. The controller can receive a control instruction of a user on the display device and determine whether the current display device is in a standby mode. For example, the controller may receive the operation of the power button on the display device by the user and the operation of starting the power button of the display device, and if the user turns on the power button of the display device and does not start the display device, then the controller indicates that the current display device is in the standby mode; if the user starts the power button and then starts the display device through the button, the current display device is indicated to be in a non-standby mode. After determining the current mode, the controller controls the operating state of the power supply in the display device. 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 in the non-standby mode, the controller can control the first power supply and the second power supply to work simultaneously.
For example, a switching device may be provided in each power supply, and the switching device may be configured to receive a switching control signal sent by the controller, so as to control the power supply to start or stop operating. In this embodiment, the controller controls the power supply in 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 power supply signals and the negative reference signals provided by the plurality of power supplies also match the power of the light emitting elements within the corresponding light zones; that is, before step 101, all the light emitting elements of the backlight module are further divided according to the rule that the light emitting elements with the same power belong to the same lamp area, so as to obtain a plurality of lamp areas.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application 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 application 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 is to be understood that the application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (6)
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 with the plurality of power supplies and the plurality of lamp areas; the plurality of power supplies includes a first power supply for providing a positive power signal to the controller and driving the light zones, and a second power supply for driving the light zones;
The plurality of power supplies output a negative power 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;
the first power supply includes: the coil winding module, the second isolation voltage conversion module and the 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 coupled 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 carrying out 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;
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 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 coupled and connected with the lamp area through the controller;
The third voltage conversion module is used for carrying out voltage conversion on the power supply signal to obtain a negative reference signal; the step-down 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 power supply signal and the negative reference signal are used for providing the controller to generate a driving signal.
2. The apparatus of claim 1, wherein the controller comprises: the device comprises a main board, a microprocessor and a plurality of constant current driving modules; a first isolation module is connected between the main board and the microprocessor;
The microprocessor is respectively connected with a first power supply and the constant current driving modules; the power supplies are connected with the corresponding constant current driving modules; the constant current driving modules are connected with the lamp areas in a one-to-one correspondence manner;
The first isolation module is used for carrying out level conversion on the control signal generated by the main board 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 driving signals for corresponding lamp areas according to the control signals analyzed by the microprocessor, the negative reference signal and the negative power supply signal.
3. The apparatus of claim 1, wherein the controller comprises: the device 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 are in one-to-one correspondence with the constant current driving modules; the constant current driving modules are connected with the microprocessor through corresponding second isolation modules;
the microprocessor is grounded and used for analyzing a control signal generated by the main board;
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;
the constant current driving module receives a negative reference signal and a negative power supply signal, and generates and provides driving signals for corresponding lamp areas according to the converted control signals, the negative reference signal and the negative power supply signal.
4. A device according to any one of claims 1-3, further comprising a back plate; the high-level ends of the lamp areas are grounded through the backboard.
5. A display control method applied to the display device according to any one of claims 1 to 4, comprising:
Determining whether the current standby mode is in;
If the power supply is in the standby mode currently, controlling the first power supply to work and controlling the second power supply to be turned off;
And if the first power supply and the second power supply are in the non-standby mode currently, controlling the first power supply and the second power supply to work.
6. The method of claim 5, wherein the negative power supply signals and the negative reference signals provided by the plurality of power supplies match the power of the light emitting elements within the corresponding light zones; the determining whether to be in standby mode currently further comprises:
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.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN202110177726.2A CN114913817B (en) | 2021-02-07 | 2021-02-07 | Display device and display control method |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006349745A (en) * | 2005-06-13 | 2006-12-28 | Toyota Industries Corp | Liquid crystal display and electronic device provided with liquid crystal display |
| TW200738057A (en) * | 2006-03-21 | 2007-10-01 | Anachip Corp | Negative voltage driving circuit and method for LED and LED illumination device |
| CN102356368A (en) * | 2009-03-25 | 2012-02-15 | 夏普株式会社 | Power supply control system and electronic device equipped with this system |
| CN105895033A (en) * | 2016-06-13 | 2016-08-24 | 青岛海信电器股份有限公司 | Multi-partition backlight drive circuit and display device |
| CN107464533A (en) * | 2017-08-21 | 2017-12-12 | 深圳创维－Rgb电子有限公司 | A kind of constant-current drive circuit and television set |
| CN209928945U (en) * | 2019-05-10 | 2020-01-10 | 深圳欧陆通电子股份有限公司 | Multi-partition backlight power supply circuit and display device |
| CN112004292A (en) * | 2020-08-03 | 2020-11-27 | 广州视源电子科技股份有限公司 | LED overvoltage protection circuit, power module and electronic equipment |
-
2021
- 2021-02-07 CN CN202110177726.2A patent/CN114913817B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006349745A (en) * | 2005-06-13 | 2006-12-28 | Toyota Industries Corp | Liquid crystal display and electronic device provided with liquid crystal display |
| TW200738057A (en) * | 2006-03-21 | 2007-10-01 | Anachip Corp | Negative voltage driving circuit and method for LED and LED illumination device |
| CN102356368A (en) * | 2009-03-25 | 2012-02-15 | 夏普株式会社 | Power supply control system and electronic device equipped with this system |
| CN105895033A (en) * | 2016-06-13 | 2016-08-24 | 青岛海信电器股份有限公司 | Multi-partition backlight drive circuit and display device |
| CN107464533A (en) * | 2017-08-21 | 2017-12-12 | 深圳创维－Rgb电子有限公司 | A kind of constant-current drive circuit and television set |
| CN209928945U (en) * | 2019-05-10 | 2020-01-10 | 深圳欧陆通电子股份有限公司 | Multi-partition backlight power supply circuit and display device |
| CN112004292A (en) * | 2020-08-03 | 2020-11-27 | 广州视源电子科技股份有限公司 | LED overvoltage protection circuit, power module and electronic equipment |
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