CN216979622U - Display control circuit and display - Google Patents
Display control circuit and display Download PDFInfo
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- CN216979622U CN216979622U CN202220430147.4U CN202220430147U CN216979622U CN 216979622 U CN216979622 U CN 216979622U CN 202220430147 U CN202220430147 U CN 202220430147U CN 216979622 U CN216979622 U CN 216979622U
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Abstract
The application relates to a display control circuit and a display. A display control circuit, comprising: the front-end main control circuit can be connected with a power supply, and is configured to generate and output corresponding control signals according to the control instruction, wherein the control signals comprise a starting signal and a shutdown signal; the switching circuit can be connected with the power supply, and is configured to be switched on according to a starting signal or switched off according to a shutdown signal; and the functional circuit is connected with the switch circuit, is configured to be connected with the power supply to supply power to realize corresponding functions after the switch circuit is switched on, and is also configured to be disconnected with the power supply to power down after the switch circuit is switched off. The power of the display in the shutdown state can be greatly reduced by arranging the front main control circuit.
Description
Technical Field
The application belongs to the technical field of display devices, and particularly relates to a display control circuit and a display.
Background
For a display product, the power consumption of the display product in the off state is an important parameter, and many regulations limit the power consumption of the display product in the off state to reduce unnecessary power consumption, for example, european regulations stipulate that the overall power of the display product in the off state must be less than 0.3W.
For a conventional low-power display, it is very easy to control the power of the whole device in the off state. However, for the high-end display at present, various functions on the display are more and more, and a large number of interfaces, sound generating devices, various backlight effects and the like are added, so that more active chips need to be added on a main board of the display, and the overall power of the display is greatly improved.
SUMMERY OF THE UTILITY MODEL
The present application aims to provide a display control circuit and a display, and aims to solve the problem of excessive power in a shutdown state of a conventional display.
A first aspect of an embodiment of the present application provides a display control circuit, including: the power supply control circuit comprises a front main control circuit, a power supply control circuit and a power supply control circuit, wherein the front main control circuit can be connected with the power supply, and is configured to generate and output corresponding control signals according to control instructions, and the control signals comprise a starting signal and a shutdown signal; a switching circuit connectable with the power supply, the switching circuit configured to turn on according to the power-on signal or turn off according to the power-off signal; the functional circuit is connected with the switch circuit, is configured to be powered on to realize a corresponding function after the switch circuit is switched on, and is also configured to be powered off after the switch circuit is switched off.
In one embodiment, the front-end main control circuit includes a first voltage conversion unit and a main control unit, an input end of the first voltage conversion unit is capable of being connected with the power supply, an output end of the first voltage conversion unit is connected with a power supply end of the main control unit, and a signal output end of the main control unit is connected with a controlled end of the switch circuit; the first voltage conversion unit is used for converting high voltage output by the power supply into low voltage and outputting the low voltage to the main control unit, and the main control unit is used for receiving the control instruction and generating and outputting the control signal according to the control instruction.
In an embodiment, the front main control circuit further includes a first filtering unit and a second filtering unit, a first end of the first filtering unit is connected to the input end of the first voltage converting unit, a second end of the first filtering unit is connected to the ground, a first end of the second filtering unit is connected to the output end of the first voltage converting unit, and a second end of the first filtering unit is connected to the ground.
In an embodiment, the front-end main control circuit further includes a voltage feedback unit, a first end of the voltage feedback unit is connected to the output end of the first voltage conversion unit, a second end of the voltage feedback unit is connected to the feedback end of the first voltage conversion unit, the voltage feedback unit is configured to generate and output a feedback voltage to the first voltage conversion unit according to the voltage output by the first voltage conversion unit, and the feedback voltage is configured to perform feedback control on the voltage output by the first voltage conversion unit.
In one embodiment, the switching circuit includes a first voltage dividing resistor, a first switching tube and a second switching tube; the first switch-on end of the first switch tube is connected with the power supply, the second switch-on end of the first switch tube Q1 is connected with the functional circuit, the first divider resistor is connected between the first switch-on end of the first switch tube and the controlled end of the first switch tube, the controlled end of the first switch tube is further connected with the first switch-on end of the second switch tube, the second switch-on end of the second switch tube is connected with the grounding end, and the controlled end of the second switch tube is connected with the controlled end of the switch circuit to receive the control signal.
In an embodiment, the switch circuit further includes a third filtering unit, and the third filtering unit is connected in series between the front main control circuit and the controlled end of the second switch tube.
In one embodiment, the switch circuit further comprises an overcurrent protection unit; the first end of the overcurrent protection unit is connected with the power supply, and the second end of the overcurrent protection unit is connected with the first conducting end of the first switch tube.
In one embodiment, the functional circuit includes a fourth filtering unit, a second voltage converting unit and a plurality of functional units; the first end of the fourth filtering unit is connected with the switch circuit, the second end of the fourth filtering unit is connected with the second voltage conversion unit, the output end of the second voltage conversion unit is connected with the plurality of functional units, and each functional unit is respectively used for realizing corresponding functions.
In one embodiment, the front-end main control circuit further includes a control switch, and the control switch is connected to the main control unit and is used for generating and outputting the control instruction.
A second aspect of the embodiments of the present application provides a display, including a display device and the display control circuit as described above, the display device being connected to the functional circuit.
Compared with the prior art, the embodiment of the application has the beneficial effects that: the main control circuit is separated from other functional circuits to form an independent front main control circuit, so that the front main control circuit can be independently powered. And the switch circuit is controlled by the front main control circuit to conduct or break the functional circuit and the power supply, so that only the front main control circuit is in a working state in a shutdown state, and the power of the display in the shutdown state is greatly reduced.
Drawings
FIG. 1 is a schematic block diagram of a display control circuit according to a first embodiment of the present application;
fig. 2 is a circuit structure diagram of a display control circuit according to a first embodiment of the present application;
fig. 3 is a schematic block diagram of a functional circuit provided in the first embodiment of the present application.
The above figures illustrate: 100. a front-end master control circuit; 110. a first voltage conversion unit; 120. a main control unit; 130. a first filtering unit; 140. a second filtering unit; 150. a voltage feedback unit; 160. a control switch; 200. a switching circuit; 210. a third filtering unit; 220. an overcurrent protection unit; 300. a functional circuit; 310. a fourth filtering unit; 320. a second voltage conversion unit; 330. a functional unit; 40. and (4) a power supply.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Fig. 1 shows a schematic block diagram of a display control circuit provided in a first embodiment of the present application, and for convenience of illustration, only the portions related to the present embodiment are shown, and detailed as follows:
a display control circuit comprises a front main control circuit 100, a switch circuit 200 and a function circuit 300. The front-end main control circuit 100 can be connected to a power supply 40, where the power supply 40 is configured to output a direct current, the power supply 40 may be an energy storage device or a rectifying device connected to a commercial power, and the front-end main control circuit 100 is configured to generate and output a corresponding control signal according to a control instruction, where the control signal includes a power-on signal and a power-off signal. The switching circuit 200 can be connected to the power supply 40, and the switching circuit 200 is configured to be turned on according to a power-on signal or turned off according to a power-off signal. The function circuit 300 is connected to the switch circuit 200, the function circuit 300 is configured to be switched on with the power supply 40 after the switch circuit 200 is switched on to realize a function corresponding to the function circuit 300, and the function circuit 300 is further configured to be switched off with the power supply 40 after the switch circuit 200 is switched off to power down.
In a conventional display control circuit, all circuits are directly connected to the same power supply, resulting in a large number of circuits and chips still in a standby state in addition to necessary control modules in a power-off state, thereby generating unnecessary power consumption. In the present embodiment, the master control circuit is separated from the functional circuit 300 to become an independent front-end master control circuit 100, so that power can be supplied to the front-end master control circuit 100 independently. The switch circuit 200 separates the functional circuit 300 from the power supply and is controlled by the front main control circuit 100, so that in the shutdown state, only the front main control circuit 100 is in the live working state, and the switch circuit 200 directly disconnects the functional circuit 300 from the power supply 40, thereby greatly reducing the power of the display control circuit in the shutdown state.
In this embodiment, the front-end main control circuit 100 includes a first voltage conversion unit 110 and a main control unit 120, an input end of the first voltage conversion unit 110 is capable of being connected to the power supply 40, an output end of the first voltage conversion unit 110 is connected to a power supply end of the main control unit 120, and a signal output end of the main control unit 120 is connected to a controlled end of the switch circuit 200; the first voltage conversion unit 110 is configured to convert a high voltage output by the power supply 40 into a low voltage and output the low voltage to the main control unit 120, where the low voltage is used as a working voltage of the main control unit 120, and the main control unit 120 is configured to receive a control instruction and generate and output a control signal according to the control instruction.
Specifically, the first voltage conversion unit 110 may be a dc voltage conversion chip U1, an input terminal of the first voltage conversion unit 110 corresponds to a VIN pin of the dc voltage conversion chip U1, an output terminal of the first voltage conversion unit 110 corresponds to an LX pin of the dc voltage conversion chip U1, and the dc voltage conversion chip U1 may step down an input high voltage and output a low voltage for the main control unit 120 to operate. The main control Unit 120 may be an MCU (micro controller Unit), and in the shutdown state, the main control Unit 120 may output a corresponding shutdown signal to control the switching circuit 200 to be turned off.
In this embodiment, the front-end main control circuit 100 further includes a first filtering unit 130 and a second filtering unit 140, a first end of the first filtering unit 130 is connected to the input end of the first voltage converting unit 110, and a second end of the first filtering unit 130 is connected to the ground. A first terminal of the second filtering unit 140 is connected to the output terminal of the first voltage converting unit 110, and a second terminal of the first filtering unit 130 is connected to the ground terminal. The first filtering unit 130 and the second filtering unit 140 each include a plurality of capacitors connected in parallel and having different specifications, so as to be used for filtering interference signals with different frequencies in the circuit, wherein the first filtering unit 130 includes a first filtering capacitor C1, a second filtering capacitor C2, and a third filtering capacitor C3, first ends of the first filtering capacitor C1, the second filtering capacitor C2, and the third filtering capacitor C3 are all connected to an input end of the first voltage converting unit 110, and second ends of the first filtering capacitor C1, the second filtering capacitor C2, and the third filtering capacitor C3 are all connected to a ground end. The second filtering unit 140 includes a fourth filtering capacitor C4, a fifth filtering capacitor C5, and a sixth filtering capacitor C6, first ends of the fourth filtering capacitor C4, the fifth filtering capacitor C5, and the sixth filtering capacitor C6 are all connected to the output end of the first voltage converting unit 110, and second ends of the fourth filtering capacitor C4, the fifth filtering capacitor C5, and the sixth filtering capacitor C6 are all connected to the ground.
In this embodiment, the front-end main control circuit 100 further includes a voltage feedback unit 150, a first end of the voltage feedback unit 150 is connected to the output end of the first voltage conversion unit 110, a second end of the voltage feedback unit 150 is connected to the feedback end of the first voltage conversion unit 110, the voltage feedback unit 150 is configured to generate and output a feedback voltage to the first voltage conversion unit 110 according to the voltage output by the first voltage conversion unit 110, and the feedback voltage is used for performing feedback control on the voltage output by the first voltage conversion unit 110.
Specifically, the voltage feedback unit 150 includes a feedback capacitor C7, a first feedback resistor R1, a second feedback resistor R2, and a third feedback resistor R3. The first end of the first feedback resistor R1 is connected to the output end of the first voltage conversion unit 110, the second end of the first feedback resistor R1 is connected to the first end of the second feedback resistor R2 and the first end of the third feedback resistor R3, the second end of the second feedback resistor R2 is connected to the feedback end (FB pin of the dc voltage conversion chip U1) of the first voltage conversion unit 110, the second end of the third feedback resistor R3 is connected to the ground, and the feedback capacitor C7 is connected in parallel to the first feedback resistor R1. The first voltage conversion unit 110 may adjust the output voltage according to the feedback voltage, so that the output voltage is more accurate and closer to the rated voltage.
In this embodiment, the front-end main control circuit 100 further includes a filter inductor L1, and the filter inductor L1 is connected in series between the output terminal of the first voltage converting unit 110 and the power source terminal of the main control unit 120 for filtering the ac interference signal.
In this embodiment, the switching circuit 200 includes a first voltage dividing resistor R4, a first switching tube Q1, and a second switching tube Q2; the first conducting end of the first switch tube Q1 is connected to the power supply 40, the second conducting end of the first switch tube Q1 is connected to the functional circuit 300, the first voltage-dividing resistor R4 is connected between the first conducting end of the first switch tube Q1 and the controlled end of the first switch tube Q1, the controlled end of the first switch tube Q1 is further connected to the first conducting end of the second switch tube Q2, the second conducting end of the second switch tube Q2 is connected to the ground, and the controlled end of the second switch tube Q2 is connected to the controlled end of the switch circuit 200 for receiving the control signal. The first switching tube Q1 may be a MOS tube, and the second switching tube Q2 may be a triode. Specifically, the first switching transistor Q1 may be a PMOS transistor, and the second switching transistor Q2 may be an NPN transistor. A first conduction end of the first switch tube Q1 corresponds to a source electrode of a PMOS transistor, a second conduction end of the first switch tube Q1 corresponds to a drain electrode of the PMOS transistor, a controlled end of the first switch tube Q1 corresponds to a gate electrode of the PMOS transistor, a first conduction end of the second switch tube Q2 corresponds to a collector electrode of an NPN triode, a second conduction end of the second switch tube Q2 corresponds to an emitter electrode of the NPN triode, and a controlled end of the second switch tube Q2 corresponds to a base electrode of the NPN triode.
It should be noted that, when the main control unit 120 outputs a high-level control signal (a power-on signal), the second switch tube Q2 is turned on, so as to pull down the voltage of the controlled terminal of the first switch tube Q1, and the first switch tube Q1 is also turned on, that is, the switch circuit 200 is turned on, so that the function circuit 300 is connected to the power supply 40. When the main control unit 120 outputs a low-level control signal (shutdown signal), the second switching tube Q2 is turned off, the voltage of the controlled terminal of the first switching tube Q1 increases, the first switching tube Q1 is also turned off, that is, the switching circuit 200 is turned off, so that the connection between the functional circuit 300 and the power supply 40 is disconnected.
Specifically, the switch circuit 200 further includes a second voltage-dividing resistor R5 and a seventh filter capacitor C8, the second voltage-dividing resistor R5 is connected in series between the controlled terminal of the first switch tube Q1 and the first conducting terminal of the second switch tube Q2, a first terminal of the seventh filter capacitor C8 is connected to the first conducting terminal of the first switch tube Q1, and a second terminal of the seventh filter capacitor C8 is connected to the controlled terminal of the first switch tube Q1.
The switch circuit 200 further includes a third filtering unit 210, and the third filtering unit 210 is connected in series between the controlled terminal of the switch circuit 200 and the controlled terminal of the second switch tube Q2. Specifically, the third filtering unit 210 includes a filtering resistor R6 and an eighth filtering capacitor C9, the filtering resistor R6 is connected in series between the signal output terminal of the main control unit 120 and the controlled terminal of the second switching tube Q2, the eighth filtering capacitor C9 is connected between the controlled terminal of the second switching tube Q2 and the ground terminal, and the filtering resistor R6 and the eighth filtering capacitor C9 are used to form an RC filtering circuit for filtering the control signal output by the main control unit 120.
The switching circuit 200 also includes a pull-down resistor R7. The first terminal of the pull-down resistor R7 is connected to the controlled terminal of the switch circuit 200, and the second terminal of the pull-down resistor R7 is connected to the ground terminal, for rapidly decreasing the voltage of the controlled terminal of the second switch transistor Q2 when the level of the signal output terminal changes from high level to low level.
In this embodiment, the switch circuit 200 further includes an overcurrent protection unit 220; a first end of the over-current protection unit 220 is connected to the power supply 40, and a second end of the over-current protection unit is connected to the first conducting end of the first switching tube Q1. The over-current protection unit 220 may be a fuse F1.
In this embodiment, the functional circuit 300 includes a fourth filtering unit 310, a second voltage converting unit 320, and a plurality of functional units 330; a first terminal of the fourth filtering unit 310 is connected to the switch circuit 200, a second terminal of the fourth filtering unit 310 is connected to ground, and an output terminal of the second voltage converting unit 320 is connected to the plurality of functional units 330.
The fourth filtering unit 310 is similar to the first filtering unit 130, and is also composed of a plurality of filtering capacitors connected in parallel, in this embodiment, the fourth filtering unit 310 includes four filtering capacitors. The second voltage conversion unit 320 may include a plurality of voltage conversion chips for respectively supplying power to the different functional units 330. The functional unit 330 may specifically include a USB HUB unit (Universal serial bus HUB), a TYPE-C interface unit, a backlight unit, a lamp effect unit, a multifunctional power amplifier unit, and the like. The functional unit 330 may be configured to be automatically activated when being powered on, or may be activated after being powered on and receiving a corresponding activation signal.
In this embodiment, the front-end main control circuit 100 further includes a control switch 160, and the control switch 160 is connected to the main control unit 120 for generating and outputting a control command. The control switch 160 may be a physical button or an electronic switch, such as a relay, a switch tube, etc.
In this embodiment, the first voltage converting unit 110 further has an enable terminal (an EN pin of the dc voltage converting chip U1), and the enable terminal of the first voltage converting unit 110 is connected to the input terminal of the first voltage converting unit 110 through a third voltage dividing resistor R8. The first voltage converting unit 110 is further provided with a bootstrap terminal (BS pin of the dc voltage converting chip U1), and the output terminal of the first voltage converting unit 110 is connected to the bootstrap terminal of the first voltage converting unit 110 through the bootstrap capacitor C10 and the bootstrap resistor R9 in sequence, so as to provide a high voltage for the inside of the first voltage converting unit 110.
A second embodiment of the present application provides a display, comprising a display device and a display control circuit as in the above embodiments, wherein the display device may be a liquid crystal panel, and the functional circuit 300 further comprises a display control unit, and the display control unit is connected to the display device for controlling the display device.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A display control circuit, comprising:
the power supply control circuit comprises a front main control circuit, a power supply control circuit and a power supply control circuit, wherein the front main control circuit can be connected with the power supply, and is configured to generate and output corresponding control signals according to control instructions, and the control signals comprise a starting signal and a shutdown signal;
a switching circuit connectable with the power supply, the switching circuit configured to turn on according to the power-on signal or turn off according to the power-off signal;
the functional circuit is connected with the switch circuit, is configured to be powered on to realize a corresponding function after the switch circuit is switched on, and is also configured to be powered off after the switch circuit is switched off.
2. The display control circuit according to claim 1, wherein the front-end main control circuit comprises a first voltage conversion unit and a main control unit, an input end of the first voltage conversion unit is capable of being connected with the power supply, an output end of the first voltage conversion unit is connected with a power end of the main control unit, and a signal output end of the main control unit is connected with a controlled end of the switch circuit; the first voltage conversion unit is used for converting the high voltage output by the power supply into the low voltage and outputting the low voltage to the main control unit, and the main control unit is used for receiving the control instruction and generating and outputting the control signal according to the control instruction.
3. The display control circuit of claim 2, wherein the front-end main control circuit further comprises a first filter unit and a second filter unit, a first end of the first filter unit is connected to the input end of the first voltage conversion unit, a second end of the first filter unit is connected to ground, a first end of the second filter unit is connected to the output end of the first voltage conversion unit, and a second end of the first filter unit is connected to ground.
4. The display control circuit according to claim 2, wherein the front-end main control circuit further comprises a voltage feedback unit, a first end of the voltage feedback unit is connected to the output end of the first voltage conversion unit, a second end of the voltage feedback unit is connected to the feedback end of the first voltage conversion unit, the voltage feedback unit is configured to generate and output a feedback voltage to the first voltage conversion unit according to the voltage output by the first voltage conversion unit, and the feedback voltage is configured to perform feedback control on the voltage output by the first voltage conversion unit.
5. The display control circuit according to any one of claims 2-4, wherein the switching circuit comprises a first voltage dividing resistor, a first switching tube and a second switching tube; the first conduction end of the first switch tube is connected with the power supply, the second conduction end of the first switch tube Q1 is connected with the functional circuit, the first divider resistor is connected between the first conduction end of the first switch tube and the controlled end of the first switch tube, the controlled end of the first switch tube is further connected with the first conduction end of the second switch tube, the second conduction end of the second switch tube is connected with the grounding end, and the controlled end of the second switch tube is connected with the controlled end of the switch circuit to receive the control signal.
6. The display control circuit of claim 5, wherein the switching circuit further comprises a third filtering unit connected in series between the front-end main control circuit and the controlled end of the second switching tube.
7. The display control circuit of claim 5, wherein the switching circuit further comprises an over-current protection unit; the first end of the overcurrent protection unit is connected with the power supply, and the second end of the overcurrent protection unit is connected with the first conducting end of the first switch tube.
8. The display control circuit of claim 1, wherein the functional circuit comprises a fourth filtering unit, a second voltage converting unit, and a number of functional units; the first end of the fourth filtering unit is connected with the switch circuit, the second end of the fourth filtering unit is connected with the second voltage conversion unit, the output end of the second voltage conversion unit is connected with the plurality of functional units, and each functional unit is respectively used for realizing corresponding functions.
9. The display control circuit of claim 2, wherein the front-facing master control circuit further comprises a control switch connected to the master control unit for generating and outputting the control command.
10. A display comprising a presentation means and a display control circuit as claimed in any one of claims 1 to 9, the presentation means being connected to the functional circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220430147.4U CN216979622U (en) | 2022-02-28 | 2022-02-28 | Display control circuit and display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220430147.4U CN216979622U (en) | 2022-02-28 | 2022-02-28 | Display control circuit and display |
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| CN216979622U true CN216979622U (en) | 2022-07-15 |
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| CN202220430147.4U Active CN216979622U (en) | 2022-02-28 | 2022-02-28 | Display control circuit and display |
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