Driving circuit and display panel

Abstract

The utility model provides a driving circuit and a display panel. The driving circuit comprises a rectifier module, a first voltage stabilizing module and a light source module, the rectifier module is used for receiving alternating voltage and converting the alternating voltage into direct voltage to be output, the first voltage stabilizing module and the rectifier module are electrically connected to a first node, and the light source module and the first voltage stabilizing module are electrically connected to the first node. The first voltage stabilizing module comprises a first capacitor and a second capacitor which are connected in series, one end of the first capacitor far away from the second capacitor is electrically connected to the first node, and one end of the second capacitor far away from the first capacitor is electrically connected to the grounding end; the first voltage stabilizing module composed of the first capacitor and the second capacitor which are connected in series is arranged at the output end of the driving circuit, the risk that the output end of the driving circuit is directly grounded is reduced through the arrangement of the double capacitors, and the safety of the driving circuit is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the display technical field, and in particular to a driving circuit and a display panel. BACKGROUND

[0002] LED (Light Emitting Diode) has the advantages of low power consumption, low heat, high brightness, long service life, etc., and is usually used as a backlight source of a display or a liquid crystal television.

[0003] At present, the LED backlight driving circuit usually adopts an inductive boost type DC / DC boost conversion principle for driving. This type of circuit usually increases a capacitor at the input end and the output end of the periphery. The input capacitor is mainly used for maintaining the stability of the input voltage and filtering the AC / wave components of the input. The output capacitor is mainly used for filtering the switching ripple and outputting a stable DC voltage. In order to ensure that the input voltage maintains a small ripple, the output capacitor should have a small equivalent series resistance and a large capacitance. However, the current material that simultaneously has these characteristics has poor mechanical properties, which causes the capacitor to short circuit, so that the output end of the driving circuit is directly connected with the ground end, resulting in the technical problem of damage to the driving chip and the LED lamp. CONTENT OF THE INVENTION

[0004] The present application provides a driving circuit and a display panel to improve the technical problem of the output capacitor of the existing driving circuit being directly connected with the ground end.

[0005] To solve the above-mentioned scheme, the technical scheme provided by the present application is as follows:

[0006] The present application provides a driving circuit, which comprises:

[0007] A rectifier module, configured to receive an alternating voltage and convert the alternating voltage into a direct current voltage output;

[0008] A first voltage stabilizing module, electrically connected with the rectifier module at a first node;

[0009] A light source module, electrically connected with the first voltage stabilizing module at the first node;

[0010] The first voltage stabilizing module comprises a first capacitor and a second capacitor connected in series. One end of the first capacitor away from the second capacitor is electrically connected with the first node, and one end of the second capacitor away from the first capacitor is electrically connected with a ground end.

[0011] Optionally, the capacitance of the first capacitor and the capacitance of the second capacitor are equal, and the withstand voltage of the first capacitor and the withstand voltage of the second capacitor are equal.

[0012] Optionally, the first capacitor has a capacitance less than that of the second capacitor, and the first capacitor has a voltage resistance greater than that of the second capacitor.

[0013] Optionally, the first capacitor and the second capacitor each have a capacitance greater than or equal to 4.5 μF, and each have a voltage resistance greater than 30 V.

[0014] Optionally, the first voltage stabilizing module further comprises a third capacitor, one end of the third capacitor being electrically connected to the first node, and the other end of the third capacitor being electrically connected to a ground terminal.

[0015] Optionally, the third capacitor has a voltage resistance greater than that of the first capacitor and greater than that of the second capacitor.

[0016] Optionally, the rectifying module comprises:

[0017] an inductor for receiving an alternating voltage and converting the alternating voltage into a direct voltage output;

[0018] a diode, one end of the diode being electrically connected to the inductor at a second node, and the other end of the diode being electrically connected to the first node.

[0019] Optionally, the driving circuit further comprises a second voltage stabilizing module, the second voltage stabilizing module being electrically connected to a third node with the inductor.

[0020] Optionally, the second voltage stabilizing module comprises a fourth capacitor, one end of the fourth capacitor being electrically connected to the third node, and the other end of the fourth capacitor being electrically connected to a ground terminal.

[0021] Optionally, the driving circuit further comprises:

[0022] a control module, one end of the control module being electrically connected to the third node;

[0023] a control transistor, a gate of the control transistor being electrically connected to the other end of the control module, a first electrode of the control transistor being electrically connected to the second node, and a second electrode of the control transistor being electrically connected to a ground terminal.

[0024] Optionally, the driving circuit further comprises a third voltage stabilizing module, the third voltage stabilizing module comprising:

[0025] a protection resistor, one end of the protection resistor being electrically connected to the third node;

[0026] a fifth capacitor, one end of the fifth capacitor being electrically connected to the other end of the protection resistor at a fourth node, and the other end of the fifth capacitor being electrically connected to a ground terminal.

[0027] The control module is electrically connected to the fourth node.

[0028] The application further provides a display panel comprising the driving circuit.

[0029] Other features and advantages of the present application will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0031] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0032] Figure 1 The first structure diagram of the driving circuit provided by the embodiments of the present application is shown in the figure.

[0033] Figure 2 The second structure diagram of the driving circuit provided by the embodiments of the present application is shown in the figure. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present application.

[0035] Please refer to Figure 1 and Figure 2 The present application provides a driving circuit 100, which comprises a rectifier module 10, a first voltage stabilizing module 20 and a light source module 30, the first voltage stabilizing module 20 and the rectifier module 10 are electrically connected to a first node Q, and the light source module 30 and the first voltage stabilizing module 20 are electrically connected to the first node Q.

[0036] In the embodiment, the rectifier module 10 is used to receive an alternating voltage and convert the alternating voltage into a direct current voltage output.

[0037] In the embodiment, the first voltage stabilizing module 20 includes a first capacitor C1 and a second capacitor C2 connected in series, one end of the first capacitor C1 away from the second capacitor C2 is electrically connected to the first node Q, and one end of the second capacitor C2 away from the first capacitor C1 is electrically connected to the ground end GND.

[0038] In the prior art driving circuit, the output end of the driving circuit is provided with an output capacitor, which is mainly used for filtering out switching ripples and outputting stable direct current voltage; and in order to ensure that the input voltage maintains a small ripple, the output capacitor should have a small equivalent series resistance and a large capacitance, and the current materials that simultaneously have the characteristics are poor in mechanical properties, causing the capacitor to short circuit, for example, a ceramic capacitor with a small equivalent series resistance, and when the ceramic capacitor cracks, the ceramic capacitor will short circuit, resulting in the output end of the driving circuit being directly connected to the ground end GND, the output current of the driving circuit increasing, and the technical problem of damage to the driving chip and the LED lamp.

[0039] The application sets the first voltage stabilizing module 20 composed of the first capacitor C1 and the second capacitor C2 connected in series at the output end of the driving circuit 100, when one of the first capacitor C1 or the second capacitor C2 short circuits, the remaining capacitor can work normally, avoiding the problem of increasing output current caused by the output end of the driving circuit 100 being directly connected to the ground end GND, and improving the technical problem of damage to the driving chip and the LED lamp; secondly, when one of the first capacitor C1 or the second capacitor C2 short circuits, the total capacitance of the capacitor in the branch will increase, further reducing the ripple of the output voltage and improving the safety of the driving circuit 100.

[0040] It should be noted that the light source module 30 of the application can include a plurality of lamp strings 310 connected in parallel, each of the lamp strings 310 including a plurality of LED lamps 311 connected in series.

[0041] It should be noted that the LED lamp of the application can be a conventional size LED, Mini-LED or Micro-LED lamp.

[0042] The technical solutions of the application will be described in conjunction with specific embodiments.

[0043] Please refer to Figure 1 , the driving circuit 100 can include a power supply end 40, a first voltage stabilizing module 20, a second voltage stabilizing module 50, a third voltage stabilizing module 60, a rectifier module 10, a control module 70, a control transistor T1 and a light source module 30, the power supply end 40, the second voltage stabilizing module 50, the third voltage stabilizing module 60 and the rectifier module 10 are all electrically connected to the third node A, and one end of the control module 70 is connected to the internal node of the third voltage stabilizing module 60.

[0044] In the embodiment, the other end of the control module 70 is connected to the control transistor T1, the gate of the control transistor T1 is electrically connected to the control module 70, the first electrode of the control transistor T1 is electrically connected to the internal node of the rectifier module 10, and the second electrode of the control transistor T1 is electrically connected to the ground end GND.

[0045] In the embodiment, the control transistor T1 can be an N-type transistor or a P-type transistor, and the following is described by taking the control transistor T1 as an N-type transistor as an example.

[0046] Referring to Figure 2 , the third voltage stabilizing module 60 can include a fifth capacitor C5 and a protection resistor R1, one end of the protection resistor R1 is electrically connected to the third node A, one end of the fifth capacitor C5 is electrically connected to the other end of the protection resistor R1 at the fourth node B, the other end of the fifth capacitor C5 is electrically connected to the ground end GND, and the control module 70 is electrically connected to the fourth node B.

[0047] In the embodiment, the protection resistor R1 is used to adjust the current entering the control module 70, so as to avoid that the current entering the control module 70 is too large to cause damage to the control module 70, and the fifth capacitor C5 is used to ensure that the voltage input to the control module 70 has a smaller ripple.

[0048] Referring to Figure 1 and Figure 2 , the rectifier module 10 includes an inductor L and a diode D, the inductor L is used to receive an alternating voltage and convert the alternating voltage into a direct current voltage output; one end of the diode D is electrically connected to the second node P and the inductor L, and the other end of the diode D is electrically connected to the first node Q, and the diode D is a unidirectional diode D.

[0049] In the embodiment, the first electrode of the control transistor T1 is electrically connected to the second node P, that is, the first electrode of the control transistor T1 is electrically connected to the node between the inductor L and the diode D.

[0050] Referring to Figure 2 , the second voltage stabilizing module 50 and the inductor L are electrically connected to the third node A, and the second voltage stabilizing module 50 includes a fourth capacitor C4, one end of the fourth capacitor C4 is electrically connected to the third node A, and the other end of the fourth capacitor C4 is electrically connected to the ground end GND.

[0051] In the embodiment, the fourth capacitor C4 is used to keep the input voltage stable and filter the AC / heterodyne component of the input, that is, the AC voltage input by the power terminal 40 is filtered by the second capacitor C2 and then input to the third node A.

[0052] Referring to Figure 2 , the second voltage stabilizing module 50 can include a plurality of second branches 510 arranged in parallel, and the fourth capacitor C4 can be arranged on each second branch 510, and a plurality of the fourth capacitors C4 are connected in parallel.

[0053] Referring to Figure 2 , the second voltage stabilizing module 50 further includes a sixth capacitor C6, one end of the sixth capacitor C6 is electrically connected to the third node A, and the other end of the sixth capacitor C6 is electrically connected to the ground terminal GND, and the sixth capacitor C6 is arranged in parallel with a plurality of the fourth capacitors C4.

[0054] In the embodiment, the capacitance of the sixth capacitor C6 is greater than or equal to that of the fourth capacitor C4, and the withstand voltage of the sixth capacitor C6 is greater than that of the fourth capacitor C4, so as to protect the second voltage stabilizing module 50 from being damaged due to an excessively large input voltage.

[0055] In the embodiment, the AC voltage input by the power terminal 40 is first filtered by the second voltage stabilizing module 50 and transmitted to the third node A, and the AC voltage filtered for the first time is simultaneously transmitted to the rectifying module 10 and the control module 70; secondly, the AC voltage is transmitted to the control module 70 by voltage division of the protection resistor R1 and filtering of the fifth capacitor C5 before entering the control module 70, and the control module 70 transmits a high level or a low level to the control transistor T1 according to the received current point, so as to control the conduction and cutoff of the control transistor T1, and the switching of the conduction and cutoff of the control transistor T1 enables the energy to be continuously stored and released in the inductor L and transmitted to the first voltage stabilizing module 20 and the light source module 30 through the diode D.

[0056] Referring to Figure 2 , the first voltage stabilizing module 20 can include a plurality of first branches 210, and the first capacitor C1 and the second capacitor C2 can be arranged on each first branch 210.

[0057] In the embodiment, since the output voltage of the driving circuit 100 is usually about 30V, the capacitance of the first capacitor C1 and the second capacitor C2 of the present application can be greater than or equal to 4.5μF, and the withstand voltage of the first capacitor C1 and the second capacitor C2 is greater than 30V.

[0058] Referring toFigure 2 The capacitance of the first capacitor C1 is equal to the capacitance of the second capacitor C2, and the voltage rating of the first capacitor C1 is equal to the voltage rating of the second capacitor C2.

[0059] For example, in Figure 2 In the structure, the capacitance of the first capacitor C1 and the second capacitor C2 can be 4.7μF, and the withstand voltage of the first capacitor C1 and the second capacitor C2 can be 50V. For each of the first branches 210, the total withstand voltage of the two first capacitors C1 and the second capacitor C2 connected in series is 100V, and the capacitance of the two first capacitors C1 and the second capacitor C2 connected in series is 2.35μF. When one of the first capacitors C1 and the second capacitor C2 is short-circuited, the withstand voltage of the capacitor in the first branch 210 decreases to 50V, and the capacitance of the capacitor in the first branch 210 increases to 4.7μF. Even if one of the first capacitors C1 and the second capacitor C2 is short-circuited, the capacitance of the first branch 210 increases, the output terminal of the driving circuit 100 is not connected to the ground terminal GND, the light source component is supplied with normal current, and the withstand voltage is not lower than the output voltage of the driving circuit 100, further reducing the ripple of the output voltage and improving the safety of the driving circuit 100.

[0060] For example, in Figure 2 In the structure, the capacitance of the first capacitor C1 and the second capacitor C2 can be 4.7μF, and the withstand voltage of the first capacitor C1 and the second capacitor C2 can be 35V. For each of the first branches 210, the total withstand voltage of the two first capacitors C1 and the second capacitor C2 connected in series is 70V, and the capacitance of the two first capacitors C1 and the second capacitor C2 connected in series is 2.35μF. When one of the first capacitors C1 and the second capacitor C2 is short-circuited, the withstand voltage of the capacitor in the first branch 210 decreases to 35V, and the capacitance of the capacitor in the first branch 210 increases to 4.7μF. Even if one of the first capacitors C1 and the second capacitor C2 is short-circuited, the capacitance of the first branch 210 increases, the output terminal of the driving circuit 100 is not connected to the ground terminal GND, the light source component is supplied with normal current, and the withstand voltage is not lower than the output voltage of the driving circuit 100, further reducing the ripple of the output voltage and improving the safety of the driving circuit 100.

[0061] In this embodiment, the capacitance of the first capacitor C1 is less than the capacitance of the second capacitor C2, and the withstand voltage of the first capacitor C1 is greater than the withstand voltage of the second capacitor C2.

[0062] For example, in Figure 2In the structure, the first capacitor C1 can have a capacitance of 4.7 μF, the first capacitor C1 can have a voltage resistance of 50 V, the second capacitor C2 can have a capacitance of 10 μF, the second capacitor C2 can have a voltage resistance of 35 V, and for each first branch 210, the voltage resistance of the two first capacitors C1 and the second capacitor C2 connected in series is 85 V, and the capacitance of the two first capacitors C1 and the second capacitor C2 connected in series is 3.2 μF; when the first capacitor C1 is short-circuited, the voltage resistance of the capacitor in the first branch 210 is reduced to 35 V, the capacitance of the capacitor in the first branch 210 is increased to 10 μF, when the second capacitor C2 is short-circuited, the voltage resistance of the capacitor in the first branch 210 is reduced to 50 V, the capacitance of the capacitor in the first branch 210 is increased to 4.7 μF, that is, one of the first capacitor C1 and the second capacitor C2 is short-circuited, the capacitance in the first branch 210 is increased, the output end of the driving circuit 100 is not connected to the ground end GND, the light source assembly is normally current, and the voltage resistance is not lower than the output voltage of the driving circuit 100, further reducing the ripple of the output voltage, and improving the safety of the driving circuit 100.

[0063] Referring to Figure 2 , the first voltage stabilizing module 20 can further include a third capacitor C3, one end of the third capacitor C3 being electrically connected to the first node Q, and the other end of the third capacitor C3 being electrically connected to the ground end GND.

[0064] In the embodiment, the voltage resistance of the third capacitor C3 is greater than the voltage resistance of the first capacitor C1, and the voltage resistance of the third capacitor C3 is greater than the voltage resistance of the second capacitor C2, and the third capacitor C3 has the same effect as the sixth capacitor C6 to protect the first voltage stabilizing module 20 from being damaged due to an excessively large input voltage.

[0065] Referring to ​ , the driving circuit 100 further includes a rectifier resistor R2 arranged between the light source module 30 and the first node Q, and the rectifier resistor R2 is used to adjust the current size input into the light source module 30.

[0066] It should be noted that the first branch 210 of the present application can also be provided with a plurality of capacitor structures, as long as the total capacitance on the first branch 210 is greater than the minimum capacitance defined by the driving circuit 100.

[0067] It should be noted that the present application further proposes a display panel, which can include the above-mentioned driving circuit, and the driving circuit is integrated in the backlight module of the display panel.

[0068] It should be noted that the present application also proposes a display device, which comprises the display panel described above, and the display device can be any product or component with display function, such as mobile phone, tablet computer, television, display, notebook computer, digital photo frame, navigator, etc.

[0069] The present application provides a driving circuit and a display panel; the driving circuit comprises a rectification module, a first voltage stabilizing module and a light source module, the rectification module is used for receiving alternating voltage and converting the alternating voltage into direct current voltage output, the first voltage stabilizing module is electrically connected to the first node with the rectification module, and the light source module is electrically connected to the first node with the first voltage stabilizing module; the first voltage stabilizing module comprises a first capacitor and a second capacitor connected in series, one end of the first capacitor away from the second capacitor is electrically connected to the first node, and one end of the second capacitor away from the first capacitor is electrically connected to the ground end; by setting the first voltage stabilizing module composed of the first capacitor and the second capacitor connected in series at the output end of the driving circuit, the risk of the output end of the driving circuit being directly grounded is reduced by the double-capacitor setting, and the safety of the driving circuit is improved.

[0070] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0071] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0072] The embodiments, implementation manners and related technical features of the present application can be combined, replaced with each other without conflict.

[0073] The above is only the preferred embodiment of the present application, and does not limit the present application in any form, but any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiment, without departing from the technical solution content of the present application, still belongs to the scope of the technical solution of the present application.

Claims

1. A driving circuit, characterized in that, include: A rectifier module, which receives AC voltage and converts the AC voltage into DC voltage for output; The first voltage regulator module is electrically connected to the rectifier module at the first node; The light source module is electrically connected to the first voltage regulator module at the first node; The first voltage regulator module includes a first capacitor and a second capacitor connected in series. The end of the first capacitor away from the second capacitor is electrically connected to the first node, and the end of the second capacitor away from the first capacitor is electrically connected to the ground terminal.

2. The driving circuit as described in claim 1, characterized in that, The capacitance of the first capacitor is equal to the capacitance of the second capacitor, and the voltage rating of the first capacitor is equal to the voltage rating of the second capacitor.

3. The driving circuit as described in claim 1, characterized in that, The capacitance of the first capacitor is less than the capacitance of the second capacitor, and the voltage rating of the first capacitor is greater than the voltage rating of the second capacitor.

4. The driving circuit as described in claim 1, characterized in that, The capacitance values ​​of both the first capacitor and the second capacitor are greater than or equal to 4.5μF, and the voltage ratings of both the first capacitor and the second capacitor are greater than 30V.

5. The driving circuit according to any one of claims 1 to 4, characterized in that, The first voltage regulator module also includes a third capacitor, one end of which is electrically connected to the first node, and the other end of which is electrically connected to the ground terminal; The third capacitor has a higher voltage rating than the first capacitor, and the third capacitor has a higher voltage rating than the second capacitor.

6. The driving circuit according to any one of claims 1 to 4, characterized in that, The rectifier module includes: An inductor is used to receive AC voltage and convert the AC voltage into DC voltage output. A diode, one end of which is electrically connected to the inductor at a second node, and the other end of which is electrically connected to the first node.

7. The driving circuit as described in claim 6, characterized in that, The driving circuit further includes a second voltage regulator module, which is electrically connected to the inductor at the third node. The second voltage regulator module includes a fourth capacitor, one end of which is electrically connected to the third node, and the other end of which is electrically connected to the ground.

8. The driving circuit as described in claim 7, characterized in that, The driving circuit also includes: A control module, one end of which is electrically connected to the third node; A control transistor, the gate of which is electrically connected to the other end of the control module, the first electrode of which is electrically connected to the second node, and the second electrode of which is electrically connected to the ground terminal.

9. The driving circuit as described in claim 8, characterized in that, The driving circuit further includes a third voltage regulator module, which includes: A protective resistor, one end of which is electrically connected to the third node; The fifth capacitor has one end electrically connected to the other end of the protective resistor at the fourth node, and the other end of the fifth capacitor is electrically connected to the ground terminal. The control module is electrically connected to the fourth node.

10. A display panel, characterized in that, The display panel includes the driving circuit as described in any one of claims 1 to 9.

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