CN215897587U

CN215897587U - Display device

Info

Publication number: CN215897587U
Application number: CN202122352818.8U
Authority: CN
Inventors: 迟洪波
Original assignee: Hisense Visual Technology Co Ltd
Current assignee: Hisense Visual Technology Co Ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-02-22
Anticipated expiration: 2031-09-27

Abstract

The application provides a display device, this display device includes: the first power supply, the plurality of second power supplies and the plurality of first controllable elements corresponding to the plurality of second power supplies; wherein the first power supply includes: the isolation voltage conversion circuit comprises a resonance control circuit and a transformer; the resonance control circuit is connected with the transformer and is used for driving the transformer to work; the output end of the transformer is used as the output end of the first power supply; a resonance control circuit in the first power supply is connected with the alternating current input, and the second power supply is sequentially connected to the alternating current input through the corresponding first controllable elements; one end of the first controllable element is connected with the alternating current input; the other end of the first controllable element is connected with a corresponding second power supply; the control end of the first controllable element is connected with the output end of the last power supply of the second power supply corresponding to the first controllable element. Through the arrangement of the first controllable element, the power supply fault caused by larger power load due to more impact current when the display device is started can be avoided.

Description

Display device

Technical Field

The application relates to the technical field of display, in particular to a display device.

Background

With the increase in size of display devices, for example, the size of display screens is increasing, and the demand for power supply from the internal power supply of the display devices is also increasing.

In order to avoid the problem that the internal load of the display device is insufficient when a single power supply is used for supplying power to the display device, a plurality of power supplies are usually provided in the display device, and the plurality of power supplies are used for supplying power to different loads in the display device.

However, the plurality of power supplies in the related art may cause a large inrush current when the display device is turned on, which may easily cause a power supply failure due to a large power load.

SUMMERY OF THE UTILITY MODEL

The application provides a display device, which solves the problem of power supply failure caused by large power load easily caused by more impact current when the display device is started up when a plurality of power supplies are arranged in the related display device.

In a first aspect, the present application provides a display device,

the method comprises the following steps: the power supply comprises a first power supply, a plurality of second power supplies and a plurality of first controllable elements corresponding to the plurality of second power supplies; wherein the first power supply comprises: an isolated voltage conversion circuit comprising a resonant control circuit and a transformer; the resonance control circuit is connected with the transformer and is used for driving the transformer to work; the output end of the transformer is used as the output end of the first power supply; a resonance control circuit in the first power supply is connected with an alternating current input, and the second power supply is sequentially connected to the alternating current input through corresponding first controllable elements; one end of the first controllable element is connected with the alternating current input; the other end of the first controllable element is connected with a corresponding second power supply;

the control end of the first controllable element is connected with the output end of the last power supply of the second power supply corresponding to the first controllable element; the first controllable element is used for being conducted according to a control signal received by a control end of the first controllable element.

In some embodiments, the first controllable element is a switching tube;

the control end of the switch tube is used as the control end of the first controllable element and is connected with the output end of the last power supply of the second power supply corresponding to the first controllable element; one end of the switch tube is connected to the alternating current input, and the other end of the switch tube is connected to a second power supply corresponding to the first controllable element.

In some embodiments, the switching tube is a field effect tube;

the drain electrode of the field effect tube is used as one end of the first controllable element and is connected with the alternating current input; the source electrode of the field effect transistor is used as the other end of the first controllable element and is connected with a second power supply corresponding to the first controllable element; and the grid electrode of the field effect transistor is used as the control end of the first controllable element and is connected with the output end of the last power supply of the second power supply corresponding to the first controllable element.

In some embodiments, the apparatus further comprises: a control unit, and at least one second controllable element;

the first power supply is connected with the control unit and used for providing a power supply signal for the control unit;

the output end of the second controllable element is connected with the control end of the first controllable element, and the input end of the second controllable element is connected with the output end of the last power supply of the second power supply corresponding to the first controllable element;

the control unit is connected with the control end of the second controllable element, and the control unit is used for controlling the second controllable element to be turned off in a standby mode and controlling the second controllable element to be turned on in a non-standby mode.

In some embodiments, the second controllable element comprises: a first transistor, a voltage regulator tube;

the base electrode of the first transistor is used as the control end of the second controllable element and used for receiving a signal sent by a control unit, the base electrode of the first transistor is connected with one end of the voltage stabilizing diode, and the other end of the voltage stabilizing diode is grounded;

the emitter of the first transistor is used as the output end of the second controllable element and is connected with the control end of the first controllable element, and the collector of the first transistor is used as the input end of the second controllable element and is connected with the output end of the last power supply of the second power supply corresponding to the first controllable element.

In some embodiments, the second controllable element further comprises: a first capacitor, a second capacitor and a third capacitor;

one end of the first capacitor is connected with the collector of the first transistor, serves as the input end of the second controllable element, and is connected with the output end of the last power supply of the second power supply corresponding to the first controllable element; the other end of the first capacitor is used as a control end of the second controllable element and is connected with the control unit, the base electrode of the first transistor and one end of the second capacitor; the other end of the second capacitor, the other end of the voltage stabilizing diode and one end of the third capacitor are connected to the ground, and the other end of the third capacitor is connected with the emitter of the first transistor and serves as the output end of the second controllable element and is connected with the control end of the first controllable element.

In some embodiments, the control unit comprises: a receiving module and a transmitting module;

the output end of the receiving module is connected with the input end of the transmission module, the output end of the transmission module is connected with the control end of the second controllable element, the transmission module is used for receiving a working signal sent by the receiving module, and if the working signal is in a standby mode, the transmission module is conducted; and if the working signal is in a normal working mode, the transmission module is switched off.

In some embodiments, the transmission module comprises: the circuit comprises a second transistor, a third transistor, a first resistor, a second resistor, a third resistor and a fourth resistor;

one end of the first resistor is used as the input end of the transmission module and is used for receiving a working signal;

the other end of the first resistor is connected with the base electrode of the third transistor, the emitter electrode of the third transistor is grounded, and the collector electrode of the third transistor is connected with one end of the second resistor and one end of the third resistor; the other end of the third resistor is connected with the first reference voltage and the emitter of the second transistor; the other end of the second resistor is connected with the base electrode of the second transistor; and the collector of the second transistor is connected with one end of the fourth resistor, the other end of the fourth resistor is grounded, and the collector of the second transistor is used as the output end of the transmission module and is connected with the control end of the second controllable element.

In some embodiments, the transmission module further comprises: a fourth capacitor and a fifth resistor;

one end of the fifth resistor is connected with the other end of the first resistor and one end of the fourth capacitor, and the other end of the fifth resistor, the other end of the fourth capacitor, the emitter of the first transistor and the other end of the fourth resistor are connected to the ground; one end of the fourth resistor is connected with the base electrode of the first transistor.

In some embodiments, the apparatus further comprises: at least one isolator;

the control unit is connected with the control end of the second controllable element through the isolator; the input end of the isolator is connected with the output end of the control unit, and the output end of the isolator is connected with the control end of the second controllable element.

In some embodiments, the isolator is a photo coupler comprising a light emitting diode and a photosensitive element;

the anode of the light emitting diode is used as the input end of the photoelectric coupler and is connected with the control unit and a second reference voltage; the cathode of the light emitting diode is grounded; the photosensitive element is coupled with the light emitting diode; one end of the photosensitive element is connected with a third reference voltage, and the other end of the photosensitive element is used as the output end of the photoelectric coupler and is connected with the control end of the second controllable element.

In some embodiments, the first power source comprises: an isolated voltage conversion circuit; the isolation voltage conversion circuit comprises a controller, a first switch tube, a second switch tube, a transformer, a first rectifying module, a fifth capacitor and a sixth capacitor; the transformer comprises a primary winding, an auxiliary winding and a secondary winding;

one end of the first switch tube is used for receiving an external power supply signal; the other end of the first switching tube, one end of the second switching tube and one end of the primary winding of the transformer are connected; the control end of the first switch tube is connected with the first end of the controller; the control end of the second switching tube is connected with the second end of the controller; the other end of the second switch tube is grounded;

the other end of the primary winding is connected with one end of a fifth capacitor, and the other end of the fifth capacitor is connected with the other end of the second switch tube and grounded; the primary winding is coupled with the secondary winding; the auxiliary winding is coupled with the secondary winding, one end of the auxiliary winding is connected with one end of the first rectifying module, and the other end of the first rectifying module is used as the output of a power supply and is connected with the control end of the first controllable element; the other end of the first rectifying module is connected with one end of the sixth capacitor, and the other end of the sixth capacitor is grounded.

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 provided with an independent power panel according to the present application;

fig. 2 is a schematic diagram illustrating a connection relationship between a power panel and a load according to the present application;

FIG. 3 is a schematic diagram of a television power architecture provided herein;

fig. 4 is a schematic structural diagram of a display device provided in the present application;

fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram illustrating a connection of a first controllable element according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a connection mode of a first component according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of another display device provided in an embodiment of the present application;

FIG. 10 is a schematic structural diagram of a second controllable element according to an embodiment of the present disclosure;

FIG. 11 is a schematic structural diagram of a second controllable element according to an embodiment of the present disclosure;

fig. 12 is a schematic structural diagram of a control unit according to an embodiment of the present disclosure;

fig. 13 is a schematic structural diagram of a transmission module according to an embodiment of the present disclosure;

fig. 14 is a schematic structural diagram of another display device according to an embodiment of the present disclosure;

fig. 15 is a schematic circuit diagram of a third display device according to an embodiment of the present disclosure;

fig. 16 is a schematic structural diagram of a power supply according to an embodiment of the present disclosure;

fig. 17 is a schematic structural diagram of another power supply provided in the embodiment of 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 aspects of the present application.

The following is a description of the application scenarios involved in the present application and the problems of the prior art.

As the demand for obtaining information is continuously increasing, various types of display devices, such as computers, televisions, projectors, and the like, are being developed. The power supply circuit is one of the most important circuit structures in the display device, and the power supply circuit can provide electric energy for the display device, so that the display device can normally operate. Some display devices are provided with independent power panels, and some display devices combine the power panels and the main board into a whole.

Taking a display device provided with an independent power board as an example, a structure of the display device is described, referring to fig. 1, fig. 1 is a schematic structural diagram of the display device provided with the independent power board according to the present application, and as shown in fig. 1, the display device includes a panel 1, a backlight assembly 2, a main board 3, a power board 4, a rear case 5 and a base 6. Wherein, the panel 1 is used for presenting pictures for users; the backlight assembly 2 is located below the panel 1, usually some optical assemblies, and is used for supplying sufficient light sources with uniform brightness and distribution, so that the panel 1 can normally display images, the backlight assembly 2 further includes a back plate 20, the main board 3 and the power board 4 are arranged on the back plate 20, usually some convex hull structures are formed by punching on the back plate 20, and the main board 3 and the power board 4 are fixed on the convex hulls through screws or hooks; the rear shell 5 is covered on the panel 1 to hide the parts of the display device such as the backlight assembly 2, the main board 3 and the power panel 4, and the like, thereby achieving the effect of beautiful appearance; and a base 6 for supporting the display device.

In some embodiments, fig. 2 is a schematic diagram of a connection relationship between a power panel and a load provided by the present application, as shown in fig. 2, the power panel 4 includes an input terminal 41 and an output terminal 42 (a first output terminal 421, a second output terminal 422, and a third output terminal 423 are shown in the figure), where the input terminal 41 is connected to a commercial power, the output terminal 42 is connected to the load, for example, the first output terminal 421 is connected to an LED light bar for lighting a display screen, the second output terminal 422 is connected to a sound box, and the third output terminal 423 is connected to a main board. The power panel 4 needs to convert ac power into dc power required by the load, and the dc power is usually in different specifications, for example, 18V is required for sound, 12V is required for panel, etc.

Specifically, taking a television as an example to introduce a power architecture of a display device, fig. 3 is a schematic diagram of the power architecture of the television provided by the present application, and as shown in fig. 3, the display device may include: supply circuit, load, control circuit, power, wherein, the power includes: a rectifier bridge, a Power Factor Correction (PFC) module, and a resonant converter (LLC) module including a synchronous rectifier circuit (not shown in fig. 3). The PFC module is connected with the LLC module, and the LLC module is respectively connected with the power supply circuit and the control circuit.

The rectifier bridge is used for rectifying input alternating current and inputting full-wave signals to the PFC module. The PFC module mainly performs power factor correction on an input ac power source and outputs a stable dc bus voltage (e.g., 380V) to the LLC module. The PFC module can effectively improve the power factor of a power supply and ensure the same phase of voltage and current. The LLC module generally includes components such as a synchronous rectification circuit, a Pulse Frequency Modulation (PFM) circuit, a capacitor, and an inductor. The LLC module may specifically step down or step up the dc bus voltage input by the PFC module, and output a constant voltage to the load. The power supply may further include a flyback module (not shown in fig. 3) for providing its own supply voltage and standby power to the PFC module and the LLC module.

The control circuit is respectively connected with the power supply and the power supply circuit and can control whether the power supply circuit is conducted or not, namely whether the electric energy output by the LLC module can supply power to the load through the power supply circuit or not is controlled, and therefore the load is turned on or turned off. The power supply circuit is also connected with the LLC module and the load, when the power supply circuit is connected, the LLC module can supply power for the load, and when the power supply circuit is disconnected, the LLC module can not supply power for the load. The load includes a main board, a backlight assembly, a display main body, and the like.

However, in order to facilitate people to obtain information, display devices are also becoming larger, such as mobile phones, computers, televisions, some large visual screens, and the like. As the display devices have been increased, loads in the display devices have been increased, and the power supply requirements for the power supplies of the display devices have been increased. For example, as the display screen of a display device is increased, the number of light emitting elements in the corresponding display device is also increased, and the power supply required for the light emitting elements is also increased. In order to avoid the problem of insufficient power supply of the display device, a plurality of power modules may be disposed in the display device, and the plurality of power modules are used to supply power to different loads in the display device.

For example, fig. 4 is a schematic structural diagram of a power supply arrangement in a display device provided in the present application. As shown in fig. 4, a plurality of power modules (for example, 3 power modules in the figure) may be disposed in the display device, and input terminals of the plurality of power modules are directly connected to the external ac input. When the display device is powered on during operation, a plurality of power supplies in the display device can receive external alternating current input at the same time, and then the display device can generate large impact current due to the simultaneous operation of the plurality of power supplies, so that the power supply load is large and power supply faults are generated.

The present application provides a display device, which aims to solve the above technical problems of the related art.

The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, 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. 5 is a schematic structural diagram of a display device according to an embodiment of the present application, and as shown in fig. 5, the display device includes: the first power supply, the plurality of second power supplies and the plurality of first controllable elements corresponding to the plurality of second power supplies; the first power supply is connected with the alternating current input, and the second power supply is sequentially connected with the alternating current input through the corresponding first controllable elements; one end of the first controllable element is connected with the alternating current input; the other end of the first controllable element is connected with a corresponding second power supply; the control end of the first controllable element is connected with the output end of the last power supply of the second power supply corresponding to the first controllable element; the first controllable element is used for being conducted according to a control signal received by a control end of the first controllable element. And wherein the first power supply comprises: the isolation voltage conversion circuit comprises a resonance control circuit and a transformer; the resonance control circuit is connected with the transformer and is used for driving the transformer to work; the output end of the transformer is used as the output end of the first power supply; a resonant control circuit in the first power supply is connected to the AC input.

Illustratively, in the present embodiment, one first power supply, a plurality of second power supplies, and a plurality of first controllable elements corresponding to the plurality of second power supplies are provided in the display device. Here, the correspondence between the first controllable element and the second power supply may be a one-to-one correspondence as shown in fig. 5. The first power source is connected directly to the ac input and the second power source is connected to the ac input through its corresponding first controllable element. In addition, the first controllable element further comprises a control end, the control end of the first controllable element can be connected with the output end of the previous power supply of the corresponding second power supply, and then only when the power supply connected with the control end of the first controllable element works and outputs a control signal to the control end, the first controllable element can be conducted, so that the second power supply corresponding to the first controllable element can receive alternating current input, and the second power supply starts to work.

In addition, an isolation voltage conversion circuit is also arranged in the first power supply, and the isolation voltage conversion circuit is formed by connecting a resonance control circuit and a transformer. The input end of the resonance control circuit can be used as the input end of the first power supply and is connected with the alternating current input, and the output end of the transformer is used as the output end of the first power supply.

In this embodiment, when the display device is turned on and normally operates, the first power supply starts to operate first, and the remaining second power supplies are controlled by the previous power supply through the first controllable device corresponding to the first power supply, so that the second power supply can start to operate only after the previous power supply operates, thereby achieving the effect of sequentially turning on the power supplies and avoiding the problem of large instantaneous current caused by simultaneous turning on of the power supplies in the display device.

In some embodiments, the relationship between the second power sources and the first controllable elements in the display device may also be a many-to-one relationship, i.e., a plurality of second power sources corresponds to one first controllable element. That is, a plurality of first controllable elements are disposed in the display device, and each first controllable element can correspond to a plurality of second power sources. The control terminal of the first controllable element is connected to the output terminal of the last power supply of the first second power supply in the plurality of second power supplies corresponding to the first controllable element, that is, the plurality of second power supplies are divided into a plurality of groups, each group corresponds to one first controllable element, and the number of the second power supplies in each group can be different. Further, in the display device, when the first power supply is turned on, the remaining plurality of second power supplies may be turned on in sequence in groups.

Compared with the previous embodiment of the embodiment, the number of the first controllable elements can be reduced in the embodiment, and the problem of large impact current when a plurality of power supplies are simultaneously turned on can be avoided to a certain extent.

In some embodiments, the first controllable element may be a switch tube. In other words, in the display device, one end of the switching tube is connected to the ac input, the control end of the switching tube is connected to the output of the previous power supply of the second power supply corresponding to the first controllable element, and the other end of the switching tube is connected to the second power supply corresponding to the first controllable element.

For example, in an actual circuit, the switch tube may be a field effect transistor, and a drain of the field effect transistor may serve as one end of the first controllable element and be connected to the ac input. The source of the field effect transistor can be used as the other end of the first controllable element and connected to the corresponding second power supply, and the grid of the field effect transistor is used as the control end of the first controllable element. When the field effect transistor is selected specifically, a high-voltage-resistant field effect transistor can be selected, so that the field effect transistor is prevented from being damaged when the voltage is too high, and the power supply cannot work normally.

In some embodiments, the first controllable element may be a relay. The first end of the relay is used as the control end of the first controllable element and is connected with the output end of the last power supply of the second power supply corresponding to the first controllable element; the second end of the relay is connected with the alternating current input; the third end of the relay is connected with a second power supply; the fourth terminal of the relay is grounded.

FIG. 6 is a schematic diagram of a connection of a first controllable element according to an embodiment of the present disclosure. As shown in fig. 6, in an actual circuit, the ac input usually includes a live line and a neutral line, where L in the figure represents live line and N represents neutral line. A first power source and a second power source are included. The live wire and the zero wire of the alternating current input are directly connected with the input end of the first power supply. The second end in the relay can be connected to the live wire of AC input, and the third end of the relay is connected to the live wire in the second power input end, and the zero line of the second power input end is connected with the zero line of AC input. The first terminal of the relay may serve as an input terminal of the first controllable element, which may receive the control signal sent by the first power output terminal. The fourth terminal of the relay is grounded. When the first end of the relay receives a control signal sent by a first power supply, the coil between the first end of the relay and the fourth end of the relay is electrified, so that the switch between the second end and the third end of the relay is conducted, the live wire input by external alternating current is conducted with the live wire of the output end of the second power supply, and the second power supply works.

In another example, the relay may include two coils and switches corresponding to the two coils one by one, that is, a double-pole relay may be used. At this time, two ends of one switch in the relay are respectively connected with the live wire of the alternating current input and the live wire of the second power input, and two ends of the other switch in the relay are respectively connected with the zero wire of the alternating current input and the zero wire of the second power input. And the input ends of the two coils are respectively connected to the output end of the first power supply, and the other ends of the two coils are connected and are grounded. After the respective input ends of the two coils receive the control signal output by the first power supply, the two coils are in a power-on state, the switches corresponding to the two coils are also switched on, further, the live wire input by alternating current is switched on with the live wire input by the second power supply, the zero wire input by alternating current is switched on with the zero wire input by the second power supply, and further, the second power supply starts to work.

Through the connection mode of the relay in the embodiment, the plurality of power supplies can be sequentially started, and the problem that instantaneous current is large when the plurality of power supplies are simultaneously started is solved.

On the basis of the above embodiment, when the first controllable element is a relay, for example, in the relay connection mode shown in fig. 6, a first diode may be further provided in the display device, wherein a first end of the first diode and a first end of the first diode may be connected to the fourth end of the relay and grounded; a second end of the first diode is connected to the first end of the relay, serves as a control end of the first controllable element, and is connected to an output end of a previous power supply of the second power supply corresponding to the first controllable element, as shown in fig. 7, where fig. 7 is a schematic structural diagram of a connection manner of the first element according to an embodiment of the present application. Namely, a diode is connected in parallel between the input end of the coil in the relay and the grounding end, so that when the relay is required to be switched off, the energy stored in the coil can be timely released, and the switching-off speed of the relay is accelerated.

In some embodiments, to avoid that a plurality of power supplies in the display device are still in a standby operation state when the display device is in a standby state, which may result in higher standby power consumption of the display device. For this reason, in addition to the device structure shown in fig. 5, in this embodiment, the display device further includes: a control unit and at least one second controllable element. As shown in fig. 8, fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present application. In fig. 8, the first power supply is further connected to the control unit on the basis of the apparatus shown in fig. 5, and the first power supply is used for providing a power supply signal to the control unit. The output end of the second controllable element is connected with the control end of the first controllable element, and the input end of the second controllable element is connected with the output end of the last power supply of the second power supply corresponding to the first controllable element.

In addition, the control unit is connected with the control end of the second controllable element, and the control unit is used for controlling the second controllable element to be turned off in the standby mode and controlling the second controllable element to be turned on in the non-standby mode.

Specifically, the control unit may be configured to receive a control instruction input by a user, and when the control instruction of the user is to control the display device to be in a standby mode, at this time, the control unit may control the control end of the second controllable element to disconnect the second controllable element, so that a path between the control end of the first controllable element connected to the second controllable element and the output end of the last power supply of the second power supply corresponding to the first controllable element is not connected, so that the last power supply cannot send a control signal to the first controllable element even when being connected, and then the first controllable element cannot be connected, and the second power supply corresponding to the other end of the first controllable element cannot operate and is in a disconnected state. When the control instruction of the user is to control the display device to be in the normal working mode, at this time, the control unit may control the control end of the second controllable element to turn on the second controllable element, and then the control end of the first controllable element connected to the second controllable element is communicated with the path between the output end of the last power supply of the second power supply corresponding to the first controllable element, so that the last power supply sends a control signal to the first controllable element under the condition of being turned on, and then the first controllable element is turned on, the second power supply corresponding to the other end of the first controllable element starts to work, and the subsequent second power supplies start to work in sequence.

It should be noted here that when the second controllable element is provided, one second controllable element may be provided between the first controllable element and the power supply path corresponding to the first controllable element, as shown in fig. 9, where fig. 9 is a schematic structural diagram of another display device provided in this embodiment of the present application. For example, in fig. 8, the second controllable element may be disposed in a path between a first controllable element and the first power output, and when the control unit controls the second controllable element to be disconnected, the first controllable element cannot receive the control signal output by the first power, the first controllable element is in a disconnected state, and then the second power connected to the first controllable element is in a closed state, and then the second power behind the second power stops working because a previous second power stops working.

In this embodiment, in order to avoid the problem that standby power consumption is large when all power supplies are in standby mode when the display device is in standby mode, the second controllable elements may be arranged in the display device, and the on or off of the first controllable elements connected to the second controllable elements is controlled by controlling a plurality of second controllable elements, so as to control the on or off of the second power supplies. And when the display device is in standby, the second controllable element is controlled to control all or part of the second power supply to be switched off so as to reduce the standby power consumption of the display device in standby. The circuit structure in the display device in fig. 9 is simpler than that of the display device in fig. 8. When the display device shown in fig. 8 is used, partial shutdown of the second power supply can be realized, and the power supply control is more flexible.

In some embodiments, fig. 10 is a schematic structural diagram of a second controllable element provided in the embodiments of the present application. As shown, the second controllable element in the display device comprises: a first transistor, a voltage regulator tube;

the base electrode of the first transistor is used as the control end of the second controllable element and used for receiving a signal sent by the control unit, the base electrode of the first transistor is connected with one end of the voltage stabilizing diode, and the other end of the voltage stabilizing diode is grounded;

When the base electrode of the first transistor receives a Signal (ST) sent by the control unit, the voltage stabilizing diode works under the action of the signal, and then the voltage at the base electrode of the first transistor is increased, so that the first transistor is conducted. The signal (VCC1) from the last power supply received at the collector of the first transistor can then be transmitted through the emitter of the first transistor to the control terminal (SW) of the first controllable element connected to the second controllable element.

In some embodiments, on the basis of the above embodiments, fig. 11 is a schematic structural diagram of a further second controllable element provided in the embodiments of the present application. As shown, on the basis of the structure of the apparatus shown in fig. 10, the second controllable element in this embodiment further includes: the first capacitor, the second capacitor and the third capacitor.

One end of the first capacitor is connected with the collector of the first transistor, is used as the input end of the second controllable element, and is connected with the output end of the last power supply of the second power supply corresponding to the first controllable element; the other end of the first capacitor is used as a control end of the second controllable element and is connected with the control unit, the base electrode of the first transistor and one end of the second capacitor; the other end of the second capacitor, the other end of the voltage stabilizing diode and one end of the third capacitor are connected to the ground, and the other end of the third capacitor is connected with the emitter of the first transistor, is used as the output end of the second controllable element and is connected with the control end of the first controllable element. Through the arrangement of the first capacitor, the second capacitor and the third capacitor, the interference of an external circuit on the transmission in the second controllable element can be prevented, and the circuit can be stabilized.

In some embodiments, on the basis of fig. 8, fig. 12 is a schematic structural diagram of a control unit provided in the embodiments of the present application, and on the basis of the structure in fig. 8, the control unit includes: a receiving module and a transmitting module;

the output end of the receiving module is connected with the input end of the transmission module, the output end of the transmission module is connected with the control end of the second controllable element, the transmission module is used for receiving the working signal sent by the receiving module, and if the working signal is in a standby mode, the transmission module is conducted; if the working signal is in the normal working mode, the transmission module is switched off.

Specifically, the receiving module in the control unit may be configured to receive a user instruction and convert the user instruction (e.g., an instruction input by a user voice, an instruction input through a display screen of the display apparatus, or an instruction input by an external controller of the display apparatus, etc.) into an operation signal. In one possible case, when the user indicates that the current display device is working normally, the receiving module converts the user indication into a high-level working signal. When the transmission module receives the working signal, the transmission module is conducted and transmits the signal to the control end of the second controllable element so as to conduct the second controllable element. When the user indicates that the current display device is in standby operation, the receiving module converts the user indication into a low-level working signal. When the transmission module receives the working signal, the transmission module is disconnected, and the second controllable element cannot be connected.

In some embodiments, on the basis of the above embodiments, the transmission module in the control unit includes: the circuit comprises a second transistor, a third transistor, a first resistor, a second resistor, a third resistor and a fourth resistor. Fig. 13 is a schematic structural diagram of a transmission module according to an embodiment of the present application. As shown in fig. 13, in this embodiment, one end of the first resistor in the transmission module is used as an input end of the transmission module, and is used for receiving the working Signal (STB) sent by the receiving module; the other end of the first resistor is connected with the base electrode of the third transistor, the emitter electrode of the third transistor is grounded, and the collector electrode of the third transistor is connected with one end of the second resistor and one end of the third resistor; the other end of the third resistor is connected with the first reference voltage and the emitter of the second transistor; the other end of the second resistor is connected with the base electrode of the second transistor; and the collector of the second transistor is connected with one end of a fourth resistor, the other end of the fourth resistor is grounded, and the collector of the second transistor is used as the output end of the transmission module and is connected with the control end of the second controllable element.

Specifically, in this embodiment, when the working signal received by the receiving end of the transmission module is a high-level working signal, at this time, the working signal is transmitted to the base of the third transistor connected to the other end of the first resistor through the first resistor, and since the emitter of the third transistor is grounded, after the high-level working signal is received at the base of the third transistor, the third transistor is turned on. Thereafter, a voltage is generated at each of the emitter and the base of the second transistor to turn on the second transistor, after which the received operating signal is output at the collector of the second transistor and sent to the control terminal of the second controllable element. When the working signal received by the transmission module is a low-level working signal, the third transistor cannot be turned on, and further cannot send a working signal to the control end of the second controllable element, that is, the second controllable element cannot be turned on, and neither the corresponding first controllable element nor the second power supply corresponding to the first controllable element can be turned on. In addition, the first resistor, the second resistor, the third resistor and the fourth resistor in the transmission module can be regarded as current limiting elements, and can play a role in protecting the second transistor and the third transistor so as to prevent the second transistor or the third transistor from being burnt out.

In this embodiment, two transistors are used as the transmission module, and then when a high level signal is received, the transmission module is turned on, and when a low level signal is received, the transmission module is turned off, so that part or all of the second power supply is turned off during standby, and power consumption of the power supply is saved.

In some embodiments, on the basis of the above embodiments, in order to avoid an external signal from causing signal interference to the transmission module, the transmission module further includes: a fourth capacitor and a fifth resistor. One end of the fifth resistor is connected with the other end of the first resistor and one end of the fourth capacitor, and the other end of the fifth resistor, the other end of the fourth capacitor, the emitter of the first transistor and the other end of the fourth resistor are connected to the ground; one end of the fourth resistor is connected with the base electrode of the first transistor.

In some embodiments, fig. 14 is a schematic structural diagram of another display device provided in the embodiments of the present application, and as shown in fig. 14, on the basis of fig. 8, at least one isolator is further disposed in the display device, so as to avoid signal interference between the primary and secondary sides of the transformer in the power supply, the isolator is usually employed to avoid signal electromagnetic interference between the two. The input end of the isolator is connected with the output end of the control unit, and the output end of the isolator is connected with the control end of the second controllable element. It should be noted that, when the display device shown in fig. 8 is adopted, an isolator may be correspondingly connected between the control terminal of each second controllable element and the output terminal of the control unit. When the schematic structural diagram of the display device shown in fig. 9 is employed, only one spacer may be provided.

In an actual circuit, the isolator in the display device may employ a photoelectric coupler. The photoelectric coupler comprises a light emitting diode and a photosensitive element. When the control unit is specifically connected with the light emitting diode, the anode of the light emitting diode is used as the input end of the photoelectric coupler and is connected with the control unit and a second reference voltage; the cathode of the light emitting diode is grounded; the photosensitive element is coupled with the light emitting diode; one end of the photosensitive element is connected with the third reference voltage, and the other end of the photosensitive element is connected with the control end of the second controllable element as the output end of the photoelectric coupler. And then, the working signal that the control unit sent transmits to the control end of the second controllable element after the light-emitting diode and the photosensitive element in the photoelectric coupler.

Specifically, on the basis of the circuit configuration of the transmission module in the control unit shown in fig. 13 and the circuit configuration of the second controllable element shown in fig. 11, when the above-described photocoupler is provided therein, the connection manner as shown in fig. 15 may be employed. Fig. 15 is a schematic circuit structure diagram of a third display device according to an embodiment of the present application. The anode of the light emitting diode in the photocoupler can be connected with the second reference voltage through the resistor R1, and the cathode of the light emitting diode can be connected with the emitter of the third transistor and then grounded. One end of the photosensitive element in the photocoupler can be connected to the output end (VCC1) of the last power supply of the second power supply corresponding to the first controllable element through a resistor R2, i.e. the signal output by the last power supply is used as a third reference voltage, and then the other end of the photosensitive element can be connected to the other end of the first capacitor. When a working signal is transmitted to the photoelectric coupler, the signal is transmitted to the control end of the second controllable element through the other end of the photosensitive element in the photoelectric coupler.

In some embodiments, fig. 16 is a schematic structural diagram of a power supply provided in this embodiment of the present application. When the power supply in the display device needs to provide a control signal to the first controllable switch corresponding to the next power supply, the following power supply structure may be adopted. Taking the first power supply as an example, the first power supply includes: an isolated voltage conversion circuit; the isolation voltage conversion circuit comprises a controller, a first switching tube, a second switching tube, a transformer, a first rectifying module, a fifth capacitor and a sixth capacitor; the transformer includes a primary winding, an auxiliary winding, and a secondary winding. The controller, the first switch tube, the second switch tube, the transformer, the first rectifying module, the fifth capacitor, and the sixth capacitor in this embodiment are the resonance control circuit in the above embodiment.

One end of the first switch tube is used for receiving an external power supply signal; the other end of the first switching tube is connected with one end of the second switching tube and one end of the primary winding of the transformer; the control end of the first switching tube is connected with the first end of the controller; the control end of the second switching tube is connected with the second end of the controller; the other end of the second switch tube is grounded; the other end of the primary winding is connected with one end of a fifth capacitor, and the other end of the fifth capacitor is connected with the other end of the second switching tube and grounded; the primary winding is coupled with the secondary winding; the auxiliary winding is coupled with the secondary winding, one end of the auxiliary winding is connected with one end of the first rectifying module, and the other end of the first rectifying module is used as the output of a power supply and is used for connecting the control end of the first controllable element; the other end of the first rectifying module is connected with one end of a sixth capacitor, and the other end of the sixth capacitor is grounded. The other end of the auxiliary winding is grounded.

Specifically, the isolated voltage conversion circuit is used for performing voltage conversion processing on an input signal so that an output signal can meet the power supply requirement of a load. In the isolated voltage conversion circuit, a primary winding and an auxiliary winding are arranged on the same side of a transformer, and a secondary winding is arranged on the other side. The controller in the isolated voltage conversion circuit controls the switching frequency of the first switching tube and the second switching tube to further change the size of a signal input to the primary winding, further, the primary winding is coupled with the secondary winding, and the secondary winding is coupled with the auxiliary winding, so that the size of a power supply signal output by the auxiliary winding is changed, the power supply signal output by the auxiliary winding can be used as a control signal of a control end of the first controllable element, when the auxiliary winding outputs the power supply signal (VCC1), the first controllable element connected with the auxiliary winding can be conducted, and then the corresponding second power supply is also started. Furthermore, the power supply signal output by the auxiliary winding can be output after the signal is rectified and filtered by the first rectifying module. The controller in this embodiment may be implemented in the form of a control chip or an actual circuit structure, and is not limited herein.

In some examples, two diodes are further disposed at the secondary winding of the transformer, anodes of the two diodes are respectively connected to two terminals of the secondary winding, and after cathodes of the two diodes are connected together, an electrical signal can be output, where the output electrical signal can be used for supplying power to a load in the display device, for example, the output electrical signal can be connected to a control unit for supplying power thereto.

In some embodiments, fig. 17 is a schematic structural diagram of another power supply provided in this embodiment of the present application. As shown in fig. 17, the power supply circuit includes: the power factor correction circuit, the isolation voltage conversion circuit, the feedback circuit and the controller. The controller is an integrated controller, and can be used for simultaneously controlling the switching tubes in the power factor correction circuit and the isolation voltage conversion circuit.

The VCC end and the GND end in the controller are respectively a power supply end and a grounding end of the controller; the HV port is connected to an external ac input via two diodes. And the controller respectively collects the voltage signal and the current signal of the power factor correction circuit through the PFCVS end and the PFCCS end, and then outputs a control signal for controlling a switching tube in the power factor correction circuit through the PFCGD so as to adjust the phases of the voltage signal and the current signal and realize the power factor correction. Specifically, the operation principle of the power factor correction circuit is similar to that of the related art, and is not described herein again.

When the ac input is processed by the pfc circuit, the processed signal may be transmitted to the isolated voltage converting circuit (i.e., one end of the switching tube in the isolated voltage converting circuit shown in the figure), and the controller provides a control signal to the two switching tubes of the isolated voltage converting circuit through the HSGD end and the LGD end, so as to control the on-off frequency of the switching tubes to change the magnitude of the signal input to the primary side of the transformer. Since the primary winding is coupled to the secondary winding in the transformer, the secondary winding may output a power supply signal to the outside, for example, the power supply signal may be used to supply power to a control unit connected to the first power source. In addition, an auxiliary winding may be disposed on the primary side of the transformer, and a power supply signal is output through the auxiliary winding and is used as a control signal of the first controllable element, in the figure, the power supply signal output by the auxiliary winding is rectified by the first rectifying module to output a control signal VCC1, where in an actual circuit, the first rectifying module may be a diode, an anode of the diode is connected to one end of the auxiliary winding, and a cathode of the diode is used as an output end of the first rectifying module to output the control signal.

In addition, a feedback circuit is further arranged in the power supply structure, the feedback circuit can be used for sampling a power supply signal (VCC2) output by a secondary side winding of the transformer, and if the sampled signal is not consistent with a preset power supply signal, the feedback signal can be transmitted to the controller, namely, the feedback signal is transmitted to an HBFB end in the controller, so that the controller adjusts the switching frequency of two switching tubes in the isolated voltage conversion circuit, and the size of the output power supply signal is further changed. In the figure, a photocoupler is also arranged in the feedback circuit, and the photocoupler can be used for isolating signals on the input side and the output side of the transformer so as to avoid electromagnetic interference. Specifically, the feedback circuit in the figure is a common circuit structure, and the working principle thereof is not described again.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure 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

1. A display device, comprising: the power supply comprises a first power supply, a plurality of second power supplies and a plurality of first controllable elements corresponding to the plurality of second power supplies; wherein the first power supply comprises: an isolated voltage conversion circuit comprising a resonant control circuit and a transformer; the resonance control circuit is connected with the transformer and is used for driving the transformer to work; the output end of the transformer is used as the output end of the first power supply; a resonance control circuit in the first power supply is connected with an alternating current input;

the second power supply is sequentially connected to the alternating current input through the corresponding first controllable elements; one end of the first controllable element is connected with the alternating current input; the other end of the first controllable element is connected with a corresponding second power supply;

2. The device of claim 1, wherein the first controllable element is a switching tube;

3. The apparatus of claim 2, wherein the switching tube is a field effect transistor;

the drain electrode of the field effect transistor is used as one end of the first controllable element and is connected with the alternating current input; the source electrode of the field effect transistor is used as the other end of the first controllable element and is connected with a second power supply corresponding to the first controllable element; and the grid electrode of the field effect transistor is used as the control end of the first controllable element and is connected with the output end of the last power supply of the second power supply corresponding to the first controllable element.

4. The apparatus of claim 1, further comprising: a control unit, and at least one second controllable element;

5. The apparatus of claim 4, wherein the second controllable element comprises: a first transistor, a voltage regulator tube;

6. The apparatus of claim 5, wherein the second controllable element further comprises: a first capacitor, a second capacitor and a third capacitor;

7. The apparatus of claim 4, wherein the control unit comprises: a receiving module and a transmitting module;

8. The apparatus of claim 7, wherein the transmission module comprises: the circuit comprises a second transistor, a third transistor, a first resistor, a second resistor, a third resistor and a fourth resistor;

9. The apparatus of claim 8, wherein the transmission module further comprises: a fourth capacitor and a fifth resistor;

10. The apparatus of claim 4, further comprising: at least one isolator;

11. The apparatus of claim 10, wherein the isolator is an opto-coupler comprising a light emitting diode and a photosensitive element;

12. The apparatus of claim 1, wherein the first power source comprises: an isolated voltage conversion circuit; the isolation voltage conversion circuit comprises a controller, a first switch tube, a second switch tube, a transformer, a first rectifying module, a fifth capacitor and a sixth capacitor; the transformer comprises a primary winding, an auxiliary winding and a secondary winding;