Power supply circuit and burning system

Abstract

The utility model discloses a power supply circuit and a burning system. The power supply circuit is used for providing driving voltage and burning voltage of the display panel. The power supply circuit comprises a driving voltage output circuit which is connected with a display panel to provide driving voltage; the detection unit is connected with the driving voltage output circuit, receives the driving voltage and provides a feedback signal, the processing unit is connected with the detection unit and provides a first control signal according to the received feedback signal, and the first control signal has an effective level when the feedback signal represents that a voltage value of the driving voltage is in a preset range; and the burning voltage output circuit is connected with the processing unit and is used for providing burning voltage during the effective level period of the first control signal. The power supply circuit provides the burning voltage only when the voltage value of the driving voltage is within the preset range, so that burning abnormity caused by fluctuation of the driving voltage is avoided, the stability of the burning system is improved, and the display effect of the display panel is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of display, in particular to a power supply circuit and a burning system. Background Art

[0002] Before the display panel is used, corresponding preset parameters can be determined according to the preset display effect, and the preset parameters can be written into the driving circuit of the display panel by burning. In this way, during the display panel display process, for example, after the display panel is powered off and restarted, the pre-written preset parameters can control the display panel to have a preset display effect, for example, control the display area, display color, etc.

[0003] In practical applications, it is often necessary to provide a burning voltage for the display panel to write the preset parameters into the driver chip. In addition, in some burning processes, it is also required to control the driving voltage Vin of the display panel within a certain range. For example, in the OTP (One Time Programmable) stage, the driving voltage of the display module needs to be maintained at 3.7V~4.1V (usually set to 3.9V); in the Margin Read stage, the driving voltage of the display panel needs to be maintained between 3.5V~3.8V (usually set to 3.6V).

[0004] However, due to the difference in loads of different display panels, the actual value of Vin fluctuates and exceeds a preset range, causing abnormal programming and affecting the display effect of the display panel. Utility Model Content

[0005] In view of the above problems, the purpose of the present application is to provide a power supply circuit and a burning system to provide a driving voltage for a display panel, and to provide a burning voltage when the voltage value of the driving voltage is within a preset range to write preset parameters into the driving circuit of the display module.

[0006] According to one aspect of the present application, a power supply circuit is provided for providing a driving voltage and a burning voltage for a display panel, characterized in that the power supply circuit comprises: a driving voltage output circuit connected to the display panel to provide the driving voltage; a detection unit connected to the driving voltage output circuit, receiving the driving voltage and providing a feedback signal, a processing unit connected to the detection unit, and providing a first control signal according to the received feedback signal, the first control signal having a valid level when the voltage value of the driving voltage represented by the feedback signal is within a preset range; and a burning voltage output circuit connected to the processing unit, providing the burning voltage during the valid level period of the first control signal.

[0007] Optionally, the processing unit is also connected to the driving voltage output circuit, and the processing unit also outputs an adjustment signal to control the driving voltage output circuit to adjust the voltage value of the driving voltage when the feedback signal indicates that the voltage value of the driving voltage is not within the preset range.

[0008] Optionally, it is characterized in that the power supply circuit also includes a switching circuit, which is connected between the driving voltage output circuit and the display panel, and the switching circuit disconnects the driving voltage output circuit from the display panel during the effective level of the second control signal. The processing unit also provides the second control signal according to the feedback signal, and the second control signal has a valid level when the voltage value of the driving voltage represented by the feedback signal is still not within the preset range after a preset number of adjustments.

[0009] Optionally, the feedback signal includes a first feedback signal and a second feedback signal, the detection unit includes an overvoltage detection module that provides the first feedback signal and a low voltage detection module that provides the second feedback signal, the first feedback signal represents a comparison result between the driving voltage and a first reference voltage; the second feedback signal represents a comparison result between the driving voltage and a second reference voltage, and the voltage value range between the first reference voltage and the second reference voltage is the preset range.

[0010] Optionally, the overvoltage detection module includes a first voltage stabilizing module and a first comparator that provide the first reference voltage. The first voltage stabilizing module includes a first transistor, a first resistor and a first voltage stabilizing diode. The first channel end of the first transistor is coupled to the first voltage; the second channel end provides the first reference voltage; the control end is connected to the cathode of the first voltage stabilizing diode, the anode of the first voltage stabilizing diode is grounded, and the first resistor is coupled between the first channel end and the control end of the first transistor; the non-phase input end of the first comparator is coupled to the first reference voltage; the inverting input end is coupled to the driving voltage; the positive power supply end is coupled to the first voltage; the inverting power supply end is grounded; and the output end provides the first feedback signal.

[0011] Optionally, the low voltage detection module includes a second voltage stabilizing module and a second comparator that provide the second reference voltage, the second voltage stabilizing module includes a second transistor, a second resistor and a second voltage stabilizing diode, the first channel end of the second transistor is coupled to the first voltage; the second channel end provides the second reference voltage; the control end is connected to the cathode of the second voltage stabilizing diode, the anode of the second voltage stabilizing diode is grounded, and the second resistor is coupled between the first channel end and the control end of the second transistor; the non-inverting input end of the second comparator is coupled to the driving voltage; the inverting input end is coupled to the second reference voltage; the positive power supply end is coupled to the first voltage; the inverting power supply end is grounded; and the output end provides the second feedback signal.

[0012] Optionally, the burning voltage output circuit includes a first transistor, a second transistor and a third resistor, the control end of the first transistor is coupled to the first control signal, and the second path end is grounded; the first path end of the first transistor is coupled to the control end of the second transistor; the first path end of the second transistor is coupled to the second voltage, and the second path end provides the burning voltage; the third resistor is coupled between the first path end and the control end of the second transistor.

[0013] Optionally, the switching circuit includes a third transistor, a fourth transistor and a fourth resistor, the control end of the third transistor is coupled to the second control signal, and the second path end is grounded; the first path end of the third transistor is coupled to the control end of the fourth transistor; the first path end of the fourth transistor is coupled to the driving voltage, and the second path end is coupled to the display panel; the fourth resistor is coupled between the first path end and the control end of the fourth transistor.

[0014] Optionally, the processing unit comprises a microprocessor.

[0015] According to another aspect of the present application, a burning system is provided, characterized in that it includes: a display panel; and a power supply circuit as described in any one of the above items, so as to provide a driving voltage and a burning voltage for the display panel.

[0016] According to the power supply circuit and burning system provided in the embodiments of the present application, since the power supply circuit provides the burning voltage only when the voltage value of the driving voltage is within a preset range, the burning abnormality caused by the driving voltage fluctuation is avoided, which is beneficial to improving the display effect of the display panel.

[0017] Furthermore, when the level of the driving voltage is not within the preset range, when the voltage value of the driving voltage is not within the preset range, the processing unit provides an adjustment signal according to the feedback signal to adjust the driving voltage, thereby improving the stability of the burning system.

[0018] Furthermore, when the driving voltage cannot be adjusted to a preset range, the switching circuit disconnects the driving voltage output circuit from the display panel, the driving voltage output circuit stops providing driving voltage to the display panel, and the display panel goes black, which can more intuitively reflect the abnormal operation of the burning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other purposes, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0020] Figure 1 A schematic structural diagram of a burning system according to an embodiment of the present application is shown;

[0021] Figure 2 Show Figure 1 A schematic structural diagram of the detection unit shown;

[0022] Figure 3 Show Figure 2 A schematic circuit diagram of the overvoltage detection module shown;

[0023] Figure 4 Show Figure 2 A schematic circuit diagram of the low voltage detection module shown;

[0024] Figure 5 Show Figure 1 The schematic circuit diagram of the burning voltage output circuit shown;

[0025] Figure 6 Show Figure 1 A schematic circuit diagram of the switching circuit shown;

[0026] Figure 7 Show Figure 1 Schematic working flow diagram of the power supply circuit shown. DETAILED DESCRIPTION

[0027] Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. In each of the accompanying drawings, the same elements are represented by the same or similar reference numerals. For the sake of clarity, the various parts in the accompanying drawings are not drawn to scale.

[0028] At the same time, certain words are used in this patent specification and claims to refer to specific components. It should be understood by those skilled in the art that manufacturers may use different terms to refer to the same component. This patent specification and claims do not use differences in names as a way to distinguish components, but rather use differences in components' functions as the criteria for distinction.

[0029] It should be understood that in the following description, a "circuit" may include a single or multiple combined hardware circuits, programmable circuits, state machine circuits, and / or elements capable of storing instructions executed by programmable circuits. When an element or circuit is said to be "connected to" another element or an element or circuit is said to be "connected between" two nodes, it may be directly coupled or connected to another element or there may be an intermediate element, and the connection between the elements may be physical, logical, or a combination thereof. Conversely, when an element is said to be "directly coupled to" or "directly connected to" another element, it means that there is no intermediate element between the two.

[0030] In addition, it should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the statement "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements.

[0031] In the present application, the MOS tube includes a first channel end, a second channel end and a control end. The first channel end is one of the source and the drain, the second channel end is the other of the source and the drain, and the control end is the gate. When the PMOS tube is turned on, the current flows from the source to the drain, and when the NMOS tube is turned on, the current flows from the drain to the source.

[0032] Similarly, the transistor also includes a first path end, a second path end and a control end. The first path end is one of the collector and the emitter, the second path end is the other of the collector and the emitter, and the control end is the base. When the NPN transistor is turned on, the current flows from the collector to the emitter; when the PNP transistor is turned on, the current flows from the emitter to the collector.

[0033] Figure 1 The schematic structural diagram of the burning system of the embodiment of the present application is shown. The burning system 1 provided in the embodiment of the present application includes a power supply circuit 100 and a display panel 200 connected to the power supply circuit. The power supply circuit 100 is used to provide a driving voltage Vin and a burning voltage Votp of the display panel 200. The driving voltage Vin is used to drive the display panel 200; the burning voltage Votp is used to write preset parameters into the driving circuit of the display panel 200.

[0034] Further, see Figure 1 The power supply circuit 100 includes a driving voltage output circuit 110 , a detection unit 120 , a processing unit 130 , a programming voltage output circuit 140 and a switch circuit 150 .

[0035] The driving voltage output circuit 110 is connected to the display panel and is used to provide a driving voltage Vin. In the embodiment of the present application, there is no specific limitation on the driving voltage output circuit 110. In some embodiments, any type of existing driving chip can be selected as the driving voltage output circuit 110 of the present application according to the working conditions.

[0036] The detection unit 120 is coupled to the driving voltage output circuit 110 , receives the driving voltage Vin, and provides a feedback signal indicating whether the voltage value of the driving voltage Vin is within a preset range.

[0037] Figure 2 Show Figure 1 A schematic structural diagram of the detection unit shown; Figure 3 Show Figure 2 A schematic circuit diagram of the overvoltage detection module shown; Figure 4 Show Figure 2 The schematic circuit diagram of the low voltage detection module shown below; Figure 2 , Figure 3 and Figure 4 The detection unit is described in detail.

[0038] In some embodiments, the feedback signal includes a first feedback signal Vfb1 and a second feedback signal Vfb2. Figure 2 As shown, the detection unit 120 includes an overvoltage detection module 121 that provides a first feedback signal Vfb1 and an undervoltage detection module 122 that provides a second feedback signal Vfb2. The first feedback signal Vfb1 represents the comparison result between the driving voltage Vin and the first reference voltage Vref1; the second feedback signal Vfb2 represents the comparison result between the driving voltage Vin and the second reference voltage Vref2; the voltage value range between the first feedback signal Vfb1 and the second feedback signal Vfb2 is the preset range.

[0039] The overvoltage detection module 121 includes a first voltage stabilizing circuit 1211 for providing a first reference voltage Vref1 and a first comparator U1. Specifically, the first voltage stabilizing circuit 1211 includes a first transistor T1, a first resistor R1 and a first voltage stabilizing diode Z1. The first transistor T1 is, for example, a PNP transistor, the first channel end of the first transistor T1 is coupled with a first voltage; the second channel end provides the first reference voltage Vref1, the control end is connected to the cathode of the first voltage stabilizing diode Z1, the anode of the first voltage stabilizing diode Z1 is grounded, and the first resistor R1 is coupled between the first channel end and the control end of the first transistor T1. The non-inverting input end of the first comparator U1 is coupled with the first reference voltage Vref1; the inverting input end is coupled with the driving voltage Vin; the positive power supply end is coupled with the first voltage; the inverting power supply end is grounded; and the output end provides a first feedback signal Vfb1. By way of example, a high level of Vfb1 indicates that Vin<Vref1; a low level indicates that Vin>Vref1.

[0040] The low voltage detection module 122 includes a second voltage stabilizing circuit 1221 that provides a second reference voltage Vref2 and a second comparator U2. Specifically, the second voltage stabilizing circuit 1221 includes a second transistor T2, a second resistor R2, and a second voltage stabilizing diode Z2. The second transistor T2 is, for example, a PNP transistor, the first channel end of the second transistor T2 is coupled to the first voltage; the second channel end provides the second reference voltage Vref2, the control end is connected to the cathode of the second voltage stabilizing diode Z2, the anode of the second voltage stabilizing diode Z2 is grounded, and the second resistor R2 is coupled between the first channel end and the control end of the second transistor T2. The inverting input end of the second comparator U2 is coupled to the second reference voltage Vref2; the inverting input end is coupled to the driving voltage Vin; the positive power supply end is coupled to the first voltage; the inverting power supply end is grounded; and the output end provides the second feedback signal Vfb2. By way of example, a high level of Vfb2 indicates that Vin>Vref2; a low level indicates that Vin<Vref2.

[0041] In some embodiments, the first voltage is, for example, a backlight voltage VLED of a display panel to improve the stability of the first reference voltage Vref1 and the second reference voltage Vref2 .

[0042] The processing unit 130 is connected to the detection unit 120 and provides a first control signal Vc1 according to the received feedback signal. In some embodiments, the processing unit 130 includes, for example, a microcontroller unit (MCU). In some other embodiments, the processing unit 130 may also include a related circuit design to implement the corresponding function.

[0043] Specifically, the first control signal Vc1 has an effective level when the voltage value of the driving voltage represented by the feedback signal is within a preset range. That is, the processing unit 130 needs to determine whether the voltage value of the driving voltage represented by the corresponding feedback signal is within the preset range to provide the first control signal Vc1 of the corresponding level. In some embodiments, this function can be implemented by the relevant comparison function of the existing MCU chip; in some other embodiments, it can also be implemented by setting a corresponding circuit.

[0044] Taking the implementation through the corresponding circuit as an example, the feedback signal corresponding to the above includes a first feedback signal Vfb1 and a second feedback signal Vfb2, and the high level of Vfb1 indicates Vin<Vref1, and the low level indicates Vin>Vref1; the high level of Vfb2 indicates Vin>Vref2, and the low level indicates Vin<Vref2. Then in some embodiments, the processing unit may include an AND gate. When the first feedback signal Vfb1 and the second feedback signal Vfb2 received by the processing unit 130 are both high levels, it represents Vref2<Vin<Vref1, that is, the voltage value of the driving voltage Vin is within a preset range, and the processing unit 130 provides the effective level of the first control signal Vc1 (for example, a high level). When either one of the first feedback signal Vfb1 and the second feedback signal Vfb2 is at a low level (it should be understood that since Vref1 and Vref2 represent the upper limit and lower limit of the preset range respectively, Vfb1 and Vfb2 do not simultaneously have a low level), it indicates that the voltage value of Vin is not within the preset range, and the processing unit 130 provides an invalid level (for example, a low level) of the first control signal Vc1.

[0045] The programming voltage output circuit 140 is connected to the processing unit 130 and outputs the programming voltage Votp during the effective level period of the first control signal Vc1.

[0046] Figure 5 Show Figure 1 The schematic circuit diagram of the programming voltage output circuit is shown in Figure 1. Figure 5 The programming voltage output circuit 140 includes a first transistor M1, a second transistor M2, and a third resistor R3. The first transistor M1 and the second transistor M2 are, for example, NMOS transistors. The control end of the first transistor M1 is coupled to the first control signal Vc1, and the second path end is grounded. The first path end of the first transistor M1 is connected to the control end of the second transistor M2, the first path end of the second transistor M2 is coupled to the second voltage, and the second path end provides the programming voltage Votp. The third resistor R3 is coupled between the first path end and the control end of the second transistor M2. The second voltage is, for example, a programming voltage VPP whose voltage value is higher than the display panel input voltage Vin.

[0047] Further, in some embodiments, in order to improve the stability of the burning system, the processing unit 130 is also connected to the driving voltage output circuit 110 to provide an adjustment signal Vs to adjust the voltage value of the driving voltage Vin. Specifically, taking the processing unit 130 including an MCU as an example, the MCU can be connected to the driving voltage output circuit 110 through, for example, an I2C bus, and when the voltage value of the driving voltage Vin represented by the feedback signal exceeds a preset range (i.e., Vin>Vref1), the corresponding adjustment signal Vs is output to adjust Vin to decrease; when the voltage value of the driving voltage Vin represented by the feedback signal does not reach the preset range (i.e., Vin<Vref2), the corresponding adjustment signal Vs is output to adjust Vin to increase. However, it should be understood that the function of outputting the adjustment signal as above can be realized by the corresponding function in the prior art MCU chip, and will not be described in detail in this application.

[0048] However, in some working conditions, even if the adjustment signal Vs is provided to the driving voltage output circuit 110 to adjust the voltage value of the driving voltage, the level of the driving voltage Vin cannot be within the preset range. Therefore, in some embodiments, in order to more intuitively reflect the abnormal operation of the burning system, the power supply circuit 100 also includes a switch circuit 150 connected between the driving voltage output circuit 110 and the display panel 200.

[0049] The processing unit 130 also provides a second control signal Vc2 according to the feedback signal, and the second control signal Vc2 has an effective level when the voltage value of the driving voltage represented by the feedback signal is still not within the preset range after being adjusted for a preset number of times. During the effective level of the second control signal Vc2, the switch circuit 150 disconnects the connection between the driving voltage output circuit 110 and the display panel 200, that is, stops providing the driving voltage Vin to the display panel 200.

[0050] Figure 6 Show Figure 1 Schematic circuit diagram of the switching circuit shown. Figure 6 , the switch circuit 150 includes a third transistor M3, a fourth transistor M4 and a fourth resistor R4. The third transistor M3 and the fourth transistor M4 are, for example, NMOS transistors. The control end of the third transistor M3 is coupled to the second control signal Vc2, and the second path end is grounded. The first path end of the third transistor M3 is connected to the control end of the fourth transistor M4, the first path end of the fourth transistor M4 is coupled to the driving voltage Vin, and the second path end is connected to the first output end of the power supply circuit. The fourth resistor R4 is coupled between the first path end and the control end of the fourth transistor M4.

[0051] It should also be understood that, for different burning conditions, the relevant algorithm can be implemented through the existing MCU chip or the control circuit of the second control signal Vc2 can be added to output the effective level of the second control signal Vc2 according to the number of adjustments of the driving voltage Vin. For example, for adding a control circuit, taking the effective level of the second control signal Vc2 output after outputting the adjustment signal Vs three times as an example, it can be achieved by connecting a preset number of enable switches in series, and turning on one enable switch each time the adjustment signal Vs is output.

[0052] Figure 7 Show Figure 1 The schematic working flow diagram of the power supply circuit shown below. Figure 7 The power supply circuit of the embodiment of the present application is further described. Figure 7 , the working process of the power supply circuit 100 includes the following steps:

[0053] Step S11, providing a driving voltage to the display panel;

[0054] In this step, the system is powered on, and the driving voltage output circuit 110 provides the driving voltage to the display panel 200 through the first output terminal of the power supply circuit 100. In the embodiment of the present application, the display panel 200 remains in a lit state under the driving of the driving voltage until the processing unit 130 outputs the effective level of the second control signal Vc2 according to the feedback signal, so that the switch circuit 150 disconnects the connection between the driving voltage output circuit 110 and the display panel 200. However, it should be understood that the present application is not limited to this. For example, in some other embodiments, after the display panel 200 performs a light test, the processing unit 130 can provide the effective level of the second control signal Vc2, so that the display panel 200 is black, until the voltage value of the driving voltage Vin is within the preset range, and the display panel 200 is re-lit.

[0055] Step S12, determining whether the driving voltage is within a preset range;

[0056] In this step, the detection unit 120 compares the driving voltage Vin with the first reference voltage Vref1 and the driving voltage Vin with the second reference voltage Vref2, respectively. Specifically, the overvoltage detection module 121 compares the first reference voltage Vref1 with the driving voltage Vin, and provides a first feedback signal Vfb1 representing the comparison result. In some embodiments, a high level of Vfb1 represents that Vref1>Vin. The low voltage detection module 122 compares the second reference voltage Vref2 with the driving voltage Vin, and provides a second feedback signal Vfb2 representing the comparison result. In some embodiments, a high level of Vfb2 represents that Vref2<Vin.

[0057] The processing unit 130 determines whether the driving voltage Vin is within the preset range according to the first feedback signal Vfb1 and the second feedback signal Vfb2. For example, when both Vfb1 and Vfb2 are high levels, the processing unit 130 determines that the level of the driving voltage Vin is within the preset range, outputs the effective level of the first control signal Vc1 to the burning voltage output circuit 140, and executes step S15; when either Vfb1 or Vfb2 is low, the processing unit 130 determines that the level of the driving voltage Vin is not within the preset range, outputs the adjustment signal Vs to the driving voltage output circuit 110, and executes step S13 and subsequent steps.

[0058] Step S13, adjusting the driving voltage;

[0059] In this step, the processing unit 130 provides a corresponding adjustment signal Vs to the driving voltage output circuit 110 according to the first feedback signal Vfb1 and the second feedback signal Vfb2. Specifically, when Vfb1 and Vfb2 represent that the driving voltage Vin is less than the first reference voltage Vref1 and the second reference voltage Vref2 at the same time, the corresponding adjustment signal Vs is provided to the driving voltage output circuit 110 to increase the driving voltage Vin; when Vfb1 and Vfb2 represent that the driving voltage Vin is greater than the first reference voltage Vref1 and the second reference voltage Vref2 at the same time, the corresponding adjustment signal Vs is provided to the driving voltage output circuit 110 to reduce the driving voltage Vin.

[0060] Step S14, determining whether the driving voltage is within a preset range;

[0061] In this step, it is determined again whether the driving voltage Vin is within the preset range. If the driving voltage Vin is within the preset range, the processing unit 130 outputs the effective level of the first control signal Vc1 to the programming voltage output circuit 140 and executes step S15; otherwise, the processing unit 130 provides the effective level of the second control signal Vc2 to the switch circuit 150 and executes step S16.

[0062] Although in Figure 7 Only one adjustment process is shown in the figure, but it should be understood that the adjustment and judgment process can be repeated multiple times to be applicable to different burning conditions.

[0063] Step S15, providing a burning voltage to the display panel;

[0064] In this step, the programming voltage output circuit 140 is controlled by the effective level of the first control signal Vc1 to provide the programming voltage Votp to the display panel 200 via the second output terminal of the power supply circuit 100 .

[0065] Step S16, the driving voltage is turned off;

[0066] In this step, the switch circuit 150 is turned off by the active level of the second control signal Vc2. The power supply circuit 100 provides the display panel 200 with a driving voltage Vin.

[0067] According to the power supply circuit and burning system provided in the embodiments of the present application, since the power supply circuit provides the burning voltage only when the voltage value of the driving voltage is within a preset range, the burning abnormality caused by the driving voltage fluctuation is avoided, which is beneficial to improving the display effect of the display panel.

[0068] Furthermore, when the level of the driving voltage is not within the preset range, when the voltage value of the driving voltage is not within the preset range, the processing unit provides an adjustment signal according to the feedback signal to adjust the driving voltage, thereby improving the stability of the burning system.

[0069] Furthermore, when the driving voltage cannot be adjusted to a preset range, the switching circuit disconnects the driving voltage output circuit from the display panel, the driving voltage output circuit stops providing driving voltage to the display panel, and the display panel goes black, which can more intuitively reflect the abnormal operation of the burning system.

[0070] According to the embodiments of the present invention, these embodiments do not describe all the details in detail, nor do they limit the present invention to specific embodiments. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and modify and use it based on the present invention.

Claims

1. A power supply circuit for providing a driving voltage and a burning voltage for a display panel, It is characterized in that The power supply circuit comprises: A driving voltage output circuit connected to the display panel to provide the driving voltage; A detection unit is connected to the driving voltage output circuit, receives the driving voltage and provides a feedback signal, a processing unit connected to the detection unit and providing a first control signal according to the received feedback signal, wherein the first control signal has a valid level when the voltage value of the driving voltage represented by the feedback signal is within a preset range; and The programming voltage output circuit is connected to the processing unit and provides the programming voltage during the effective level period of the first control signal.

2. The power supply circuit according to claim 1, It is characterized in that The processing unit is also connected to the driving voltage output circuit, and when the feedback signal indicates that the voltage value of the driving voltage is not within the preset range, the processing unit outputs an adjustment signal to control the driving voltage output circuit to adjust the voltage value of the driving voltage.

3. The power supply circuit according to claim 2, It is characterized in that The power supply circuit further includes a switch circuit, which is connected between the drive voltage output circuit and the display panel, and the switch circuit disconnects the drive voltage output circuit from the display panel during the effective level of the second control signal. The processing unit further provides the second control signal according to the feedback signal, wherein the second control signal has a valid level when the voltage value of the driving voltage represented by the feedback signal is still not within the preset range after being adjusted a preset number of times.

4. The power supply circuit according to claim 1, It is characterized in that The feedback signal includes a first feedback signal and a second feedback signal, the detection unit includes an overvoltage detection module that provides the first feedback signal and a low voltage detection module that provides the second feedback signal, The first feedback signal represents a comparison result between the driving voltage and a first reference voltage; The second feedback signal represents a comparison result between the driving voltage and a second reference voltage, and a voltage value range between the first reference voltage and the second reference voltage is the preset range.

5. The power supply circuit according to claim 4, It is characterized in that The overvoltage detection module includes a first voltage stabilization module and a first comparator that provide the first reference voltage. The first voltage stabilizing module includes a first transistor, a first resistor and a first voltage stabilizing diode, wherein the first channel end of the first transistor is coupled to the first voltage; the second channel end provides the first reference voltage; the control end is connected to the cathode of the first voltage stabilizing diode, the anode of the first voltage stabilizing diode is grounded, and the first resistor is coupled between the first channel end and the control end of the first transistor; The non-inverting input terminal of the first comparator is coupled with the first reference voltage; The inverting input terminal is coupled with the driving voltage; The positive phase power supply terminal is coupled to the first voltage; the negative phase power supply terminal is grounded; and the output terminal provides the first feedback signal.

6. The power supply circuit according to claim 5, It is characterized in that The low voltage detection module includes a second voltage stabilization module and a second comparator that provide the second reference voltage. The second voltage stabilizing module includes a second triode, a second resistor and a second voltage stabilizing diode, and the first channel end of the second triode is coupled to the first voltage; The second channel terminal provides the second reference voltage; The control end is connected to the cathode of the second voltage stabilizing diode, the anode of the second voltage stabilizing diode is grounded, and the second resistor is coupled between the first channel end of the second transistor and the control end; The non-inverting input terminal of the second comparator is coupled to the driving voltage; The inverting input terminal is coupled to the second reference voltage; The positive phase power supply terminal is coupled to the first voltage; the negative phase power supply terminal is grounded; and the output terminal provides the second feedback signal.

7. The power supply circuit according to claim 1, It is characterized in that The programming voltage output circuit includes a first transistor, a second transistor and a third resistor. The control end of the first transistor is coupled to the first control signal, and the second path end is grounded; the first path end of the first transistor is coupled to the control end of the second transistor; the first path end of the second transistor is coupled to the second voltage, and the second path end provides the burning voltage; the third resistor is coupled between the first path end and the control end of the second transistor.

8. The power supply circuit according to claim 3, It is characterized in that The switch circuit includes a third transistor, a fourth transistor and a fourth resistor, The control end of the third transistor is coupled to the second control signal, and the second path end is grounded; the first path end of the third transistor is coupled to the control end of the fourth transistor; the first path end of the fourth transistor is coupled to the driving voltage, and the second path end is coupled to the display panel; the fourth resistor is coupled between the first path end and the control end of the fourth transistor.

9. The power supply circuit according to claim 2, It is characterized in that The processing unit includes a microprocessor.

10. A burning system, It is characterized in that include: Display panel; as well as The power supply circuit according to any one of claims 1 to 9, wherein the power supply circuit provides a driving voltage and a burning voltage for the display panel.

Images