CN211427807U - Drive circuit and display device - Google Patents
Drive circuit and display device Download PDFInfo
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- CN211427807U CN211427807U CN202020123083.4U CN202020123083U CN211427807U CN 211427807 U CN211427807 U CN 211427807U CN 202020123083 U CN202020123083 U CN 202020123083U CN 211427807 U CN211427807 U CN 211427807U
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Abstract
The utility model relates to a show technical field, disclose a drive circuit and display device, this drive circuit is used for providing drive voltage for display panel, and it includes: a driving chip for providing a driving signal; connect driver chip and according to drive signal generation drive voltage's output module to and control module, wherein, output module includes: the first ends of the plurality of first capacitors are used for receiving driving signals, and the second ends of the plurality of first capacitors are connected to a virtual ground end; the first ends of the second capacitors are connected with the first end of the first capacitor, the second ends of the second capacitors are connected with the grounding end, and the control module controls the connection or disconnection between the virtual grounding end and the grounding end according to the working state of the driving circuit. Therefore, the capacitors with different specifications can be used compatibly, the driving chip can be ensured to work normally under no-load or on-load conditions, the singleness of material selection is avoided, the risk of material shortage is eliminated, and the production efficiency is ensured.
Description
Technical Field
The utility model relates to a show technical field, concretely relates to drive circuit and display device.
Background
With the rapid development of LED lighting, the cost requirement for LED drivers is lower and lower, and the cost of LED drivers is higher and lower depending on the choice of LED driving scheme. At present, the most used LED driving scheme at home and abroad is a circuit scheme combining single-stage Primary Side constant current control (PSR) with Power Factor Correction (PFC), and the scheme has the characteristics of simple circuit, high constant current precision, low cost and the like. However, the single-stage PSR combined with PFC has a disadvantage that the LED has stroboscopic effect, i.e. fixed frequency flicker when taking pictures with a camera. To compensate for the stroboscopic disadvantage of this solution, there is an application of adding a ripple removing stroboscopic circuit, as in application No. 201610795710.7, entitled as a ripple eliminating circuit and an LED control circuit using the ripple removing stroboscopic circuit, that is, the ripple removing stroboscopic circuit is used.
This remove ripple and remove stroboscopic scheme, it is showing to remove the stroboscopic effect, has adorned and has removed the stroboscopic circuit after, and the stroboscopic problem has been solved, but has come out again in new problem, because of this control principle who removes the ripple circuit uses power adjusting tube to concatenate with the LED light source, and the dynamic resistance of control adjusting tube (switching on) is with the absorbed current ripple. However, since the adjusting tube is large current when working in the amplifying region and in a critical conduction state for a long time, it is easily affected by external factors, and over-current, over-voltage or over-heat can be instantly generated to cause the adjusting tube to fail, especially, the independent LED driver has no-load or bad load contact or short circuit or the adjusting tube is overheated or static electricity, and the occurrence rate of the failure is very high, and the failure period is short. When the driver causes overvoltage or short circuit and overcurrent of a power output end between a source electrode and a drain electrode of an adjusting tube at the moment of starting or due to external influence, a protection circuit formed by connecting a plurality of diodes in series between the source electrode and the drain electrode of the adjusting tube in parallel can shunt current and limit overvoltage, and the adjusting tube is protected from failure due to overcurrent or overvoltage.
Another solution or further solution to the problem of ripple reduction and stroboscopic reduction in the prior art is to reduce the output current ripple by increasing the output capacitance. In the scheme, the output ripple of part of the LED drivers is too large, and the capacitance of the output end needs to be changed from 2.2uF/0603/50V to 4.7 uF/0603/50V. In actual production, the capacitance of 4.7uF/0603/50V is small, and the output voltage of part of LED drivers is 36V under the condition of no load, so that 4.7uF/0603/35V cannot be used as a substitute. For example, when the light string is designed to be 27V, the output voltage of the LED driver is 27V under the load condition, and can reach 36V under the no-load condition, so that only a capacitor with a withstand voltage of 4.7uF/50V can be selected. If a 4.7uF/35V withstand voltage capacitor is selected, it is inevitable that the element is damaged and the circuit is abnormal due to the over-specification withstand voltage, so that the risk of production starvation is caused.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a drive circuit can compatible use the electric capacity of low withstand voltage value, guarantees drive circuit homoenergetic normal work under no-load and area load state simultaneously.
On the one hand the utility model provides a drive circuit for display panel provides driving voltage, it includes: the device comprises a driving chip, an output module and a control module;
the output module is electrically connected with the driving chip, the driving chip provides a driving signal and transmits the driving signal to the output module, and the output module provides the driving voltage to the display panel;
the output module comprises a first capacitor bank and a second capacitor bank, wherein the first capacitor bank is formed by connecting a plurality of capacitors in parallel, the second capacitor bank is formed by connecting a plurality of capacitors in parallel, the first end of the first capacitor bank receives the driving signal, the second end of the first capacitor bank is connected to a virtual ground terminal, the first end of the second capacitor bank is connected to the first ends of the plurality of capacitors of the first capacitor bank, and the second end of the second capacitor bank is connected to the ground terminal;
the control module is electrically connected with the output module and the driving chip respectively, and controls the connection or disconnection of the virtual grounding end and the grounding end according to the working state of the driving circuit.
Preferably, the control module comprises:
a flexible circuit board, connected to the display panel, the output module and the driving chip, for providing the driving voltage to the display panel and outputting a feedback signal to the driving chip, wherein the flexible circuit board has a plurality of connection pins, and the plurality of pins include:
the input pin is connected with the output module and used for receiving the driving voltage;
the output pin is connected with the driving chip and used for sending a feedback signal of the flexible circuit board;
a virtual ground terminal pin for connecting the virtual ground terminal; and
a ground pin, which is connected to the ground,
the virtual ground terminal pin is connected with the ground pin.
Preferably, the control module further comprises a connector connecting the flexible circuit board, the output module and the driving chip.
Preferably, the first capacitor bank at least comprises a first capacitor, a second capacitor and a third capacitor, first ends of the first capacitor, the second capacitor and the third capacitor all receive the driving signal, second ends of the first capacitor, the second capacitor and the third capacitor are commonly electrically connected to the virtual ground,
the second capacitor bank at least comprises a fourth capacitor and a fifth capacitor, wherein the first ends of the fourth capacitor and the fifth capacitor are connected to the first end of the first capacitor, and the second ends of the fourth capacitor and the fifth capacitor are commonly connected to the ground terminal.
Preferably, the control module is a control switch, and is connected between the virtual ground terminal and the ground terminal.
Preferably, the control switch is controlled by a control signal to be turned on or off, wherein the control signal is provided by the display panel or the driving chip.
Preferably, the control switch is a field effect transistor or a bipolar transistor.
Preferably, the driving circuit is in an idle state, and the connection between the virtual ground terminal and the ground terminal is in a disconnected state; the driving circuit is in a loaded working state, and the virtual grounding end is connected with the grounding end in a communicated state.
On the other hand the utility model provides a display device, including display panel and foretell drive circuit, wherein, drive circuit is used for providing drive voltage for display panel.
The utility model has the advantages that: the utility model provides a drive circuit and a display device, when the drive circuit is loaded, the capacitor with low withstand voltage value is grounded; when the driving circuit is in no-load, the capacitor with a low voltage withstanding value is empty and is not connected with the circuit, the design gives consideration to the effects of protecting the capacitor and the circuit, and meanwhile, the driving circuit can be compatible with capacitors of different specifications under the condition of normal work, so that the singleness of material selection is avoided, the risk of material shortage is eliminated, and the production efficiency is ensured.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 shows a block diagram of a driving circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of one embodiment of the driving circuit of FIG. 1;
FIG. 3 is a circuit diagram of another embodiment of the driving circuit of FIG. 1;
fig. 4 is a schematic diagram illustrating an operation state of the driving circuit in the no-load state according to the embodiment of the present invention;
fig. 5 is a schematic diagram illustrating an operating state of the driving circuit in the loaded state according to the embodiment of the present invention.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 shows a block diagram of a driving circuit according to an embodiment of the present invention, and fig. 2 shows a schematic circuit structure diagram of an implementation manner of the driving circuit in fig. 1.
As shown in fig. 1-2, an embodiment of the present invention provides a driving circuit 100 for providing a driving voltage for a display panel 200, including: the driving circuit comprises a driving chip 10 and an output module 20, wherein the output module 20 is connected to the driving chip 10, the driving chip 10 is used for providing a driving signal and transmitting the driving signal to the output module 20, and the output module 20 provides the driving voltage Vout to the display panel 200.
The output module 20 includes a first capacitor bank in which a plurality of capacitors are connected in parallel and a second capacitor bank in which a plurality of capacitors are connected in parallel; the first capacitor bank at least comprises a first capacitor C1, a second capacitor C2 and a third capacitor C3, first ends of the first capacitor C1, the second capacitor C2 and the third capacitor C3 all receive the driving signal, second ends of the first capacitor C1, the second capacitor C2 and the third capacitor C3 are commonly connected to a virtual ground GND1, the second capacitor bank at least comprises a fourth capacitor C4 and a fifth capacitor C5, first ends of the fourth capacitor C4 and the fifth capacitor C5 are all connected to the first end of the first capacitor, and second ends are commonly connected to the ground GND.
The driving circuit 100 further includes a control module 30, and the control module 30 controls connection or disconnection between the virtual ground GND1 and the ground GND according to an operating state of the driving circuit 100. Specifically, when the driving circuit 100 is in the idle state, the control module 30 controls the connection between the virtual ground GND1 and the ground GND to be in the disconnection state; when the driving circuit 100 is in the on-load state, the control module 30 controls the connection between the virtual ground GND1 and the ground GND to be in the connection state.
Further, the control module 30 includes a flexible circuit board 320, which is connected to the display panel 200, supplies a driving voltage Vout to the display panel 200, and outputs a feedback signal to the driving chip 10.
Further, the control module 30 further includes a connector 310 connected between the flexible circuit board 320, the driver chip 10 and the output module 20; wherein, the flexible circuit board 320 is connected between the connector 310 and the display panel 200, and each connection pin connected to the flexible circuit board 320 of the connector 310 has a pin on the connector 310 to be correspondingly connected with the pin, specifically, the connection pin of the flexible circuit board 320 includes: the input pins Vout1 and Vout2 for receiving the driving voltage Vout, the output pins IFB1 to IFB4 for sending feedback signals, the virtual ground pin connected to the virtual ground GND1, the ground pin, and the dummy pins NC1 and NC2 are correspondingly connected through the above-mentioned connection pins to complete signal transmission, wherein the virtual ground pin is connected to the ground pin. When the driving circuit 100 is in the idle state, the flexible circuit board 320 is not connected to the circuit, and the connection between the virtual ground GND1 and the ground GND is disconnected; when the driving circuit 100 is in the on-load state, the flexible circuit board 320 is connected to the circuit to operate, and the virtual ground GND1 is connected to the ground GND in a connected state.
In this embodiment, the connector 310 is introduced to establish a connection path at the point where the driver circuit and the flexible circuit board are blocked, thereby allowing current to flow and the circuit to perform its design function. The circuit design is simplified to a certain extent, the installation process of the circuit is also simplified, and meanwhile, the electronic element component is convenient to repair and replace due to failure.
Fig. 3 is a schematic circuit diagram of another embodiment of the driving circuit in fig. 1.
In another embodiment of this embodiment, the output module 20 is connected to the driving chip 10, the driving chip 10 is used for providing a driving signal and transmitting the driving signal to the output module 20, the output module 20 provides the driving voltage Vout to the display panel, and the control module 30 includes a control switch S1 connected between the virtual ground terminal GND1 and the ground terminal GND.
Further, when the driving circuit 100 is in the idle state, the control switch S1 is turned off, and the virtual ground terminal GND1 is turned off from the ground terminal GND; when the driving circuit 100 is in a loaded state, the control switch S1 is turned on, and the virtual ground GND1 is connected to the ground GND. Further, the control switch S1 is controlled by the control signal to be turned on or off. Alternatively, the control signal is provided by the display panel 200 or the driving chip 10.
Fig. 4 shows the working state diagram of the driving circuit in the no-load state in the embodiment of the present invention, and fig. 5 shows the working state diagram of the driving circuit in the loaded state in the embodiment of the present invention.
In this embodiment, through the above circuit design, when the flexible circuit board connected to the connector does not access the circuit to operate or the control switch is turned off when the driving circuit 100 is idle, the virtual ground GND1 is idle and does not access the circuit, and at this time, the operating state of the output module 20 is as shown in fig. 4; when the driving circuit 100 is loaded, the virtual ground GND1 is grounded, and the access circuit operates, and the operating state of the output module 20 is shown in fig. 5.
Further, the flexible circuit board 320 includes a Light bar formed by one or more sets of Light-Emitting diodes (LEDs) connected in series, and the first capacitor C1, the second capacitor C2 and the third capacitor C3 are capacitors with the same specification, and have voltage withstanding values smaller than or equal to the driving voltage Vout of the driving circuit 100 when the driving circuit is idle and larger than the rated operating voltage of the flexible Light bar in the flexible circuit board 320. In another embodiment of the present invention, the withstand voltage values of the first capacitor C1, the second capacitor C2 and the third capacitor C3 are all greater than the driving voltage Vout when the driving circuit 100 is idle. Therefore, the driving circuit 100 in this embodiment can not only achieve the purpose of reducing output ripples, but also be compatible with capacitors with low voltage withstanding values and high voltage withstanding values, so as to ensure normal operation of the circuit, and element damage and circuit abnormality of the driving circuit during no-load due to too small voltage withstanding value of the capacitor at the output end can be avoided.
In the present embodiment, the control switch S1 is, for example, a field effect transistor or a bipolar transistor, and the control switch S1 controls the connection or disconnection between the virtual ground GND1 and the ground GND according to the operating state of the driving circuit 100. Further, the control switch may be an NMOS transistor or a PMOS transistor.
On the other hand the utility model provides a display device, it includes: the driving circuit 100 is used for providing a driving voltage for the display panel 200, wherein the driving circuit 100 comprises: the driving circuit includes a driving chip 10, an output module 20 and a control module 30, wherein the output module 20 is electrically connected to the driving chip 10, the driving chip 10 is configured to provide a driving signal and transmit the driving signal to the output module 20, the output module 20 provides a driving voltage Vout to the display panel 200, the output module 20 includes a first capacitor set and a second capacitor set, the first capacitor set and the second capacitor set are connected in parallel, the first capacitor set receives the driving signal, the second capacitor set is connected to a virtual ground GND1, the first capacitor set is connected to the first capacitors of the first capacitor set, the second capacitor set is connected to the ground GND, and the control module 30 is configured to control the connection or disconnection between the virtual ground GND1 and the ground GND according to a working state of the driving circuit 100.
In one embodiment, the control module is a control switch, for example, the control switch is a field effect transistor or a bipolar transistor, and is connected between the virtual ground terminal and the ground terminal, the display panel or the driving chip outputs a control signal according to an operating state of the driving circuit, and the control switch is controlled by the control signal to be turned on or off, so as to connect or disconnect the virtual ground terminal and the ground terminal. Further, the control switch may be an NMOS transistor or a PMOS transistor.
In addition, according to the actual circuit condition (the rated working voltage of the lamp strip and the specification of the first capacitor), the driving chip can normally work under the load or no-load state through reasonable circuit design, the phenomenon that elements of the driving chip are damaged and circuits are abnormal under the no-load state due to the fact that the capacitor with a low voltage withstanding value is selected is avoided, the effects of protecting the capacitor and the protecting circuit are taken into consideration, meanwhile, the capacitor with the low voltage withstanding value specification can be used compatibly under the condition that the driving circuit normally works, the material selection singleness in the factory production process is avoided, the material shortage risk is eliminated, and the production efficiency is guaranteed.
It should be noted that in the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", and the like, indicate positional or positional relationships for convenience of description of the present invention and to simplify the description, but do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Further, in this document, the contained terms "include", "contain" or any other variation thereof are intended to cover a non-exclusive inclusion, so that a process, a method, an article or an apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such process, method, article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications may be made without departing from the scope of the present invention.
Claims (9)
1. A driving circuit for providing a driving voltage to a display panel, comprising: the device comprises a driving chip, an output module and a control module;
the output module is electrically connected with the driving chip, the driving chip provides a driving signal and transmits the driving signal to the output module, and the output module provides the driving voltage to the display panel;
the output module comprises a first capacitor bank and a second capacitor bank, wherein the first capacitor bank is formed by connecting a plurality of capacitors in parallel, the second capacitor bank is formed by connecting a plurality of capacitors in parallel, the first end of the first capacitor bank receives the driving signal, the second end of the first capacitor bank is connected to a virtual ground terminal, the first end of the second capacitor bank is connected to the first ends of the plurality of capacitors of the first capacitor bank, and the second end of the second capacitor bank is connected to the ground terminal;
the control module is electrically connected with the output module and the driving chip respectively, and controls the connection or disconnection of the virtual grounding end and the grounding end according to the working state of the driving circuit.
2. The drive circuit of claim 1, wherein the control module comprises:
a flexible circuit board connected to the display panel, the output module and the driving chip, providing the driving voltage to the display panel, and outputting a feedback signal to the driving chip,
wherein the flexible circuit board has a plurality of connection pins, the plurality of pins including:
the input pin is connected with the output module and used for receiving the driving voltage;
the output pin is connected with the driving chip and used for sending a feedback signal of the flexible circuit board;
a virtual ground terminal pin for connecting the virtual ground terminal; and
a ground pin, which is connected to the ground,
the virtual ground terminal pin is connected with the ground pin.
3. The drive circuit of claim 2, wherein the control module further comprises:
and the connector is connected with the flexible circuit board, the output module and the driving chip.
4. The driving circuit of claim 1, wherein the first capacitor set comprises at least a first capacitor, a second capacitor and a third capacitor, first ends of the first capacitor, the second capacitor and the third capacitor all receive the driving signal, second ends of the first capacitor, the second capacitor and the third capacitor are commonly connected to the virtual ground,
the second capacitor bank at least comprises a fourth capacitor and a fifth capacitor, wherein the first ends of the fourth capacitor and the fifth capacitor are connected to the first end of the first capacitor, and the second ends of the fourth capacitor and the fifth capacitor are commonly connected to the ground terminal.
5. The driving circuit of claim 1, wherein the control module comprises a control switch connected between the virtual ground and the ground.
6. The driving circuit according to claim 5, wherein the control switch is controlled to be turned on or off by a control signal, wherein the control signal is provided by the display panel or the driving chip.
7. The driving circuit according to claim 6, wherein the control switch is a field effect transistor or a bipolar transistor.
8. The driving circuit according to claim 1, wherein the driving circuit is in an idle state, and the virtual ground is disconnected from the ground; the driving circuit is in a loaded working state, and the virtual grounding end is connected with the grounding end in a communicated state.
9. A display device comprising a display panel and the driver circuit according to any one of claims 1 to 8; the driving circuit is used for providing driving voltage for the display panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020123083.4U CN211427807U (en) | 2020-01-19 | 2020-01-19 | Drive circuit and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020123083.4U CN211427807U (en) | 2020-01-19 | 2020-01-19 | Drive circuit and display device |
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| CN211427807U true CN211427807U (en) | 2020-09-04 |
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| CN202020123083.4U Active CN211427807U (en) | 2020-01-19 | 2020-01-19 | Drive circuit and display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114007325A (en) * | 2021-11-25 | 2022-02-01 | 合肥鑫晟光电科技有限公司 | Circuit board and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114007325A (en) * | 2021-11-25 | 2022-02-01 | 合肥鑫晟光电科技有限公司 | Circuit board and electronic equipment |
| CN114007325B (en) * | 2021-11-25 | 2023-09-19 | 合肥鑫晟光电科技有限公司 | Circuit board and electronic equipment |
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