Drive circuit and display device

Abstract

This invention provides a driving circuit and a display device. The driving circuit provides a driving voltage to a data chip and includes: a power supply circuit, including an enable terminal and a power output terminal, wherein the enable terminal controls whether the power output terminal outputs a driving voltage to the data chip; and a comparator circuit electrically connected to a second power signal terminal, a reference voltage terminal, the power output terminal, and the enable terminal. The comparator circuit is configured to control the signal connected to the second power signal terminal at the enable terminal to prevent the power output terminal from outputting a driving voltage when the driving voltage is greater than the reference voltage at the reference voltage terminal. By setting the comparator circuit to detect the driving voltage output by the power output terminal and comparing it with a set reference voltage, if the driving voltage is greater than the reference voltage, the power output terminal is controlled to stop outputting the driving voltage, thereby avoiding damage to the data chip caused by abnormally high driving voltage, which could lead to a black screen on the display panel.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a driving circuit and a display device. Background Technology

[0002] In related technologies, the data chip provides data signals to the display panel, and the Power IC (power management chip) provides driving voltage to the data chip to provide power for the operation of the data chip.

[0003] When the resistive area of ​​the FS (the frequency adjustment pin in the power management chip) of the Power IC is touched or the FS pin is touched, the driving voltage will rise abnormally, which will damage the data chip and cause the display panel to go black. Summary of the Invention

[0004] Embodiments of the present invention provide a driving circuit and a display device to solve the problem that when the driving voltage output by the Power IC rises abnormally, it causes damage to the data chip and results in a black screen on the display panel.

[0005] To solve the above problems, the technical solution provided by the present invention is as follows:

[0006] In a first aspect, embodiments of the present invention provide a driving circuit for providing a driving voltage to a data chip, comprising:

[0007] The power supply circuit includes an enable terminal and a power output terminal, wherein the enable terminal is used to control whether the power output terminal outputs the driving voltage to the data chip;

[0008] A comparator circuit, which is electrically connected to a second power signal terminal, a reference voltage terminal, the power output terminal, and the enable terminal;

[0009] The comparator circuit is configured to control the signal connected to the second power signal terminal at the enable terminal to prevent the power output terminal from outputting the driving voltage when the driving voltage is greater than the reference voltage at the reference voltage terminal.

[0010] In one embodiment, the comparator circuit is also electrically connected to a first power supply signal terminal and is configured to control the signal connected to the first power supply signal terminal at the enable terminal to control the power supply output terminal to output the drive voltage when the drive voltage is less than or equal to the reference voltage.

[0011] In one embodiment, the comparison circuit includes:

[0012] A comparator module, wherein the input terminal of the comparator module is electrically connected to the power supply output terminal, and the reference terminal of the comparator module is used to receive the reference voltage; and

[0013] A switching module, wherein the input terminal of the switching module is electrically connected to the enable terminal and the first power signal terminal, the output terminal of the switching module is electrically connected to the second power signal terminal, and the control terminal of the switching module is electrically connected to the output terminal of the comparator module;

[0014] When the driving voltage is greater than the reference voltage, the comparison output terminal outputs a first control signal to turn on the switching module, thereby connecting the enable terminal to the signal of the second power signal terminal to control the power output terminal not to output the driving voltage.

[0015] When the driving voltage is less than or equal to the reference voltage, the comparison output terminal outputs a second control signal to disconnect the switching module, thereby enabling the signal of the first power signal terminal to be connected to the enable terminal, so as to control the power output terminal to output the driving voltage.

[0016] In one embodiment, the comparison module includes a comparator, the comparator comprising:

[0017] The positive input terminal is electrically connected to the power output terminal to serve as the input terminal of the comparator module;

[0018] The negative input terminal is used to receive the reference voltage for use as the reference terminal of the comparison module;

[0019] A comparison output terminal, used to output the first control signal as the output terminal of the comparison module; and

[0020] A feedback resistor is electrically connected between the negative input terminal and the comparison output terminal.

[0021] In one embodiment, the comparison circuit further includes a first current-limiting resistor, which is electrically connected between the comparison output terminal and the control terminal of the switching module.

[0022] In one embodiment, the driving circuit further includes a second current-limiting resistor and a third current-limiting resistor, the second current-limiting resistor being electrically connected between the first power signal terminal and the enable terminal, and the third current-limiting resistor being electrically connected between the output terminal of the switching module and the second power signal terminal.

[0023] In one embodiment, the power supply circuit includes:

[0024] A power management chip, including a first output pin;

[0025] An inductor is electrically connected to the first output pin and the power output terminal to provide the drive voltage to the power output terminal;

[0026] A first filter capacitor and a diode are connected in parallel. One common terminal of the first filter capacitor and the diode connected in parallel is electrically connected to the inductor, and the other common terminal of the first filter capacitor and the diode connected in parallel is grounded.

[0027] In one embodiment, the power management chip further includes:

[0028] The second output pin, electrically connected to the power supply output terminal, is used to control the magnitude of the drive voltage.

[0029] An adjustment pin, which is grounded through a first adjustment resistor, is used to adjust the drive voltage output by the power management chip.

[0030] An enable pin, which serves as the enable terminal and is used to control the power management chip to turn on and off;

[0031] The power input pin is electrically connected to the third power signal terminal to provide the operating voltage for the power management chip.

[0032] In one embodiment, the power supply circuit further includes:

[0033] The second regulating resistor is electrically connected between the second output pin and the power output terminal;

[0034] The third regulating resistor is electrically connected between the second output pin and the ground terminal;

[0035] The second and third regulating resistors are used in conjunction with the second output pin to adjust the magnitude of the driving voltage.

[0036] Secondly, embodiments of the present invention also provide a display device, including a driving circuit as described in any of the preceding embodiments, a display panel, and a data chip, wherein the data chip is used to drive the display panel.

[0037] The beneficial effects of the present invention are as follows: by setting the comparison circuit to detect the driving voltage output by the power output terminal, and comparing the driving voltage with the set reference voltage, if the driving voltage is greater than the reference voltage, the signal of the enable terminal connected to the second power signal terminal is used to control the power output terminal to stop outputting the driving voltage, thereby avoiding the problem of data chip damage caused by abnormal increase of driving voltage, resulting in black screen of display panel. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Appendix Figure 1 This is a schematic diagram of the driving circuit in one embodiment of the present invention;

[0040] Appendix Figure 2 This is a schematic diagram of the driving circuit in one embodiment of the present invention;

[0041] Appendix Figure 3 This is a schematic diagram of the driving circuit in one embodiment of the present invention;

[0042] Appendix Figure 4 This is a schematic diagram of the power supply circuit in one embodiment of the present invention. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0044] In some embodiments, this addresses the problem that an abnormally high drive voltage output by the Power IC can damage the data chip, causing the display panel to go black.

[0045] like Figure 1 As shown, this embodiment provides a driving circuit for providing a driving voltage to a data chip 300. The driving circuit includes a power supply circuit 100, a comparator circuit 200, a second power supply signal terminal, and a reference voltage terminal. The second power supply signal terminal provides a second power supply signal, and the reference voltage terminal provides a reference signal. It is understood that the second power supply signal has a second power supply voltage V. SS The reference signal has a reference voltage V ref .

[0046] The power supply circuit 100 includes an enable terminal P_EN and a power output terminal OUT. The power output terminal OUT is used to output the driving voltage to the data chip 300, and the enable terminal P_EN is used to control whether the power output terminal OUT outputs the driving voltage to the data chip 300. The comparator circuit 200 is electrically connected to the second power signal terminal, the reference voltage terminal, the power output terminal OUT, and the enable terminal P_EN. The comparator circuit 200 is configured to operate when the driving voltage is greater than the reference voltage V at the reference voltage terminal. ref When the enable terminal P_EN is connected to the second power supply voltage V of the second power signal terminal, the second power supply voltage V is controlled. SS The power output terminal OUT is controlled to stop outputting the drive voltage.

[0047] In this embodiment, the comparison circuit 200 is configured to detect the driving voltage output from the power output terminal OUT, and the driving voltage is compared with the set reference voltage V. ref A comparison is made; if the driving voltage is greater than the reference voltage V... ref Then, the signal of connecting the enable terminal P_EN to the second power signal terminal controls the power output terminal OUT to stop outputting the driving voltage, thereby avoiding the problem of damage to the data chip 300 caused by abnormal increase of the driving voltage, resulting in a black screen on the display panel.

[0048] In one embodiment, the driving circuit further includes a first power supply signal terminal, which is used to provide a first power supply signal, the first power supply signal having a first power supply voltage V. DD The first power supply voltage V DD The power supply circuit 100 can be controlled to output the driving voltage at the power output terminal OUT. The comparator circuit 200 is electrically connected to the first power signal terminal to receive the first power supply voltage V. DD When the comparator circuit 200 detects that the driving voltage is less than or equal to the reference voltage V... ref When the signal is connected to the first power signal terminal via the enable terminal P_EN, the comparator circuit 200 controls the power output terminal OUT to output the driving voltage.

[0049] like Figure 2 As shown, in one embodiment, the comparison circuit 200 includes a comparison module 201 and a switching module 202. The input terminal of the comparison module 201 is electrically connected to the power output terminal OUT, and the reference terminal of the comparison module 201 is electrically connected to the reference voltage terminal to receive the reference voltage V. refThe input terminal of the switch module 202 is electrically connected to the enable terminal P_EN and the first power signal terminal, the output terminal of the switch module 202 is electrically connected to the second power signal terminal, and the control terminal of the switch module 202 is electrically connected to the output terminal of the comparator module 201.

[0050] When the driving voltage is greater than the reference voltage V ref At this time, the output terminal of the comparison module 201 outputs a first control signal. The control terminal of the switch module 202 receives the first control signal, and the switch module 202 is turned on, thereby connecting the enable terminal P_EN to the second power supply voltage V at the second power supply signal terminal. SS The power supply circuit 100 operates at the second power supply voltage V. SS Under the control of the power output terminal OUT, the driving voltage is stopped from being output to the data chip 300.

[0051] When the driving voltage is less than or equal to the reference voltage V ref When the comparison module 201 outputs a second control signal, the control terminal of the switch module 202 receives the second control signal and disconnects, thereby connecting the enable terminal P_EN to the first power supply voltage V at the first power supply signal terminal. DD The power supply circuit 100 operates at the first power supply voltage V. DD Under the control of [the system], the power output terminal OUT is controlled to output the driving voltage to the data chip 300. It can be understood that the first power supply voltage V [is...]. DD The voltage required for the power supply circuit 100 to operate is the second power supply voltage V. SS The voltage required to shut down the power supply circuit 100. In some embodiments, the second power supply voltage V SS Less than the first power supply voltage V DD If the second power signal terminal is grounded, the second power supply voltage V SS It is zero.

[0052] In one embodiment, the switching module 202 includes a switching transistor T1, the input terminal of which serves as the input terminal of the switching module 202, the output terminal of which serves as the output terminal of the switching module 202, and the control terminal of which serves as the control terminal of the module. It is understood that the switching transistor T1 includes both N-type and P-type thin-film transistors.

[0053] like Figure 3As shown, in one embodiment, the comparison module 201 includes a comparator Y1, which compares the input voltage with a preset reference voltage Vref. The comparator Y1 includes a positive input terminal +, a negative input terminal -, a comparison output terminal O, and a feedback resistor R1. The positive input terminal + is electrically connected to the power output terminal OUT to serve as the input terminal of the comparison module 201. The negative input terminal - receives the reference voltage Vref to serve as the reference terminal of the comparison module 201. The comparison output terminal O outputs the first control signal to serve as the output terminal of the comparison module 201. The feedback resistor R1 is electrically connected between the negative input terminal - and the comparison output terminal O.

[0054] In one embodiment, the comparator circuit 200 further includes a first current-limiting resistor R2, which is electrically connected between the comparator output terminal O and the control terminal of the switch module 202. It is understood that adjusting the resistance value of the first current-limiting resistor R2 can adjust the magnitude of the control signal output from the comparator output terminal O, and the two ends of the first current-limiting resistor R2 can also be used as test points to facilitate testing the control signal.

[0055] In one embodiment, the driving circuit further includes a second current-limiting resistor R3 and a third current-limiting resistor R4. The second current-limiting resistor R3 is electrically connected between the first power signal terminal and the enable terminal P_EN, and the third current-limiting resistor R4 is electrically connected between the output terminal of the switching transistor T1 and the second power signal terminal.

[0056] like Figure 4 As shown, in one embodiment, the power supply circuit 100 includes a power management chip 101, which generates the drive voltage. The power management chip 101 includes a first output pin LX, a second output pin FB, an adjustment pin FS, an enable pin EN, and a power input pin IN.

[0057] The second output pin FB is electrically connected to the power output terminal OUT, and is used to control the magnitude of the drive voltage. The adjustment pin FS is electrically connected to one end of the first adjustment resistor R7, and the other end of the first adjustment resistor R7 is grounded. The adjustment pin FS and the first adjustment resistor R7 are used to adjust the frequency of the power management chip 101, thereby adjusting the output drive voltage. The enable pin EN is used to control the power management chip 101 to turn on and off and is electrically connected to the enable terminal P_EN. The power input pin IN is electrically connected to the third power signal terminal, which is used to provide a third power signal to provide the third power voltage V required for the operation of the power input terminal P_IN of the power management chip 101. CC .

[0058] In one embodiment, the power supply circuit 100 further includes an inductor L1, a second regulating resistor R5, a third regulating resistor R6, a first filter capacitor C1, and a diode D1. The inductor L1 is electrically connected to the first output pin LX and the power output terminal OUT to provide the drive voltage to the power output terminal OUT. The second regulating resistor R5 is electrically connected between the second output pin FB and the power output terminal OUT, and the third regulating resistor R6 is electrically connected between the second output pin FB and ground. The second regulating resistor R5 and the third regulating resistor R6 are used to adjust the magnitude of the drive voltage in conjunction with the second output pin FB. Specifically, the ratio of the resistance value of the second regulating resistor R5 to the resistance value of the third regulating resistor is controlled to adjust the magnitude of the drive voltage.

[0059] The first filter capacitor C1 and the diode D1 are connected in parallel. One common terminal of the parallel connection between the first filter capacitor C1 and the diode D1 is electrically connected to the inductor L1, and the other common terminal is grounded. The filter capacitor is used to filter noise in the driving voltage output by the inductor L1. It is understood that the power supply circuit 100 may include multiple filter capacitors. For example, the power supply circuit 100 may also include a second filter capacitor C2, with one end of the second filter capacitor C2 grounded and the other end electrically connected to the inductor L1.

[0060] In some embodiments, multiple filter capacitors are also provided at the power input pin IN. For example, the power circuit 100 further includes a third filter capacitor C3 and a fourth filter capacitor C4, which are connected in parallel. One common terminal of the parallel connection of the third filter capacitor C3 and the fourth filter capacitor C4 is electrically connected to the power input pin IN, and the other common terminal of the parallel connection of the third filter capacitor C3 and the fourth filter capacitor C4 is grounded.

[0061] This invention also provides a display device, which includes a display panel, a data chip 300, and the driving circuit described in the above embodiments. The driving circuit provides driving power to the data chip 300, and the data chip 300 drives the display panel to display.

[0062] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A driving circuit for providing a driving voltage to a data chip, characterized in that, include: The power supply circuit includes an enable terminal and a power output terminal, wherein the enable terminal is used to control whether the power output terminal outputs the driving voltage to the data chip; A comparator circuit, which is electrically connected to a second power signal terminal, a reference voltage terminal, the power output terminal, and the enable terminal; The comparison circuit includes a comparison module and a switching module. The input terminal of the comparison module is electrically connected to the power output terminal. The reference terminal of the comparison module is used to receive the reference voltage. The output terminal of the comparison module is connected to the control terminal of the switching module through a first current-limiting resistor. The comparator circuit is configured to control the signal connected to the second power signal terminal at the enable terminal to control the power output terminal not to output the driving voltage when the driving voltage is greater than the reference voltage at the reference voltage terminal. When the driving voltage is less than or equal to the reference voltage, the output terminal of the comparison module outputs a second control signal to disconnect the switching module, thereby connecting the enable terminal to the signal of the first power signal terminal to control the power output terminal to output the driving voltage.

2. The driving circuit according to claim 1, characterized in that, The comparator circuit is also electrically connected to the first power signal terminal and is configured to control the signal connected to the first power signal terminal at the enable terminal to control the power output terminal to output the drive voltage when the drive voltage is less than or equal to the reference voltage.

3. The driving circuit according to claim 2, characterized in that, The input terminal of the switching module is electrically connected to the enable terminal and the first power signal terminal, the output terminal of the switching module is electrically connected to the second power signal terminal, and the control terminal of the switching module is electrically connected to the output terminal of the comparator module. When the driving voltage is greater than the reference voltage, the output terminal of the comparison module outputs a first control signal to turn on the switching module, thereby connecting the enable terminal to the signal of the second power signal terminal to control the power output terminal not to output the driving voltage.

4. The driving circuit according to claim 3, characterized in that, The comparison module includes a comparator, the comparator comprising: The positive input terminal is electrically connected to the power output terminal to serve as the input terminal of the comparator module; The negative input terminal is used to receive the reference voltage for use as the reference terminal of the comparison module; A comparison output terminal, used to output the first control signal as the output terminal of the comparison module; and A feedback resistor is electrically connected between the negative input terminal and the comparison output terminal.

5. The driving circuit according to claim 4, characterized in that, The comparison circuit further includes a first current-limiting resistor, which is electrically connected between the comparison output terminal and the control terminal of the switching module.

6. The driving circuit according to claim 3, characterized in that, The driving circuit also includes a second current-limiting resistor and a third current-limiting resistor. The second current-limiting resistor is electrically connected between the first power signal terminal and the enable terminal, and the third current-limiting resistor is electrically connected between the output terminal of the switching module and the second power signal terminal.

7. The driving circuit according to claim 1, characterized in that, The power supply circuit includes: A power management chip, including a first output pin; An inductor is electrically connected to the first output pin and the power output terminal to provide the drive voltage to the power output terminal; A first filter capacitor and a diode are connected in parallel. One common terminal of the first filter capacitor and the diode connected in parallel is electrically connected to the inductor, and the other common terminal of the first filter capacitor and the diode connected in parallel is grounded.

8. The driving circuit according to claim 7, characterized in that, The power management chip also includes: The second output pin, electrically connected to the power supply output terminal, is used to control the magnitude of the drive voltage. An adjustment pin, which is grounded through a first adjustment resistor, is used to adjust the drive voltage output by the power management chip. An enable pin, which serves as the enable terminal and is used to control the power management chip to turn on and off; The power input pin is electrically connected to the third power signal terminal to provide the operating voltage for the power management chip.

9. The driving circuit according to claim 8, characterized in that, The power supply circuit also includes: The second regulating resistor is electrically connected between the second output pin and the power output terminal; The third regulating resistor is electrically connected between the second output pin and the ground terminal; The second and third regulating resistors are used in conjunction with the second output pin to adjust the magnitude of the driving voltage.

10. A display device, characterized in that, It includes the driving circuit as described in any one of claims 1-9, as well as a display panel and a data chip, wherein the data chip is used to drive the display panel.

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