Automatic restart circuit and method of display panel, display module

Abstract

Provided are an automatic restart circuit and method of a display panel, and a display module, belonging to the technical field of display. In the automatic restart circuit, the control circuit and the switching circuit can cooperate with each other to control the charging and discharging node to be charged or discharged based on a scanning signal reflecting whether the display panel is faulty, and to control the on-off of the power input end and the power management circuit based on the voltage of the charging and discharging node. Therefore, when the display panel is faulty, the power input end and the power management circuit are disconnected to make the power management circuit stop supplying power to the display panel and control the display panel to shut down, and when the display panel returns to normal, the power input end and the power management circuit are turned on to make the power management circuit supply power to the display panel again and control the display panel to start up, thereby completing an automatic restart of the display panel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to an automatic restart circuit and method of a display panel, and a display module. BACKGROUND

[0002] The display module is a component that presents information in a visual form, and is widely used in various scenes. For example, it is used in a vehicle-mounted scene as a vehicle-mounted module to display driving-related information to a user.

[0003] In the related art, the display module generally includes a display panel or display screen, and a driving circuit of the display panel. The driving circuit of the display panel includes, for example, a scanning circuit and a power management circuit. The power management circuit can provide power supply for the display panel based on a power supply voltage provided by a power input end to start the display panel. The scanning circuit can output a scanning signal to a pixel in the display panel to drive the pixel to emit light after the display panel is started. In this way, the display panel can display a picture.

[0004] However, due to various factors (such as display screen failure), the display panel may not be able to display normally at some time. At this time, an automatic restart circuit of the display panel is needed to quickly restart the display panel to display normally. SUMMARY

[0005] An automatic restart circuit and method of a display panel, and a display module are provided, which can solve the problem that the display panel cannot be automatically restarted in the related art. The technical solution is as follows:

[0006] In one aspect, an automatic restart circuit of a display panel is provided, and the automatic restart circuit includes:

[0007] a control circuit, connected with a power input end, a charge-discharge node, a scanning output end, a first control end and a second control end respectively, and configured to output a first control signal to the first control end based on a power supply voltage input by the power input end and a voltage of the charge-discharge node, and output a second control signal to the second control end based on the power supply voltage and a scanning signal output by the scanning output end;

[0008] a switch circuit, connected with the power input end, a power output end, the second control end, the charge-discharge node and a pull-down end respectively, and configured to control the power input end and the power output end in response to the first control signal, control the charge-discharge node and the pull-down end in response to an output voltage output by the power output end, and control the charge-discharge node and the pull-down end in response to the output voltage and the second control signal;

[0009] The power supply output end is used for being connected with the power management circuit; and when the charge-discharge node is disconnected with the pull-down end, the charge-discharge node is charged, and when the charge-discharge node is connected with the pull-down end, the charge-discharge node is discharged.

[0010] Optionally, the control circuit comprises:

[0011] The first control sub-circuit is connected with the power input end, the charge-discharge node and the first control end respectively, and is used for generating a first reference voltage based on the power supply voltage, comparing the first reference voltage and the voltage of the charge-discharge node, and outputting the first control signal to the first control end.

[0012] The second control sub-circuit is connected with the power input end, the scan output end and the second control end respectively, and is used for generating a second reference voltage based on the power supply voltage, generating a state indication voltage based on the scan signal, comparing the second reference voltage and the state indication voltage, and outputting the second control signal to the second control end.

[0013] Optionally, the first control sub-circuit comprises:

[0014] The first voltage dividing unit is connected with the power input end and a first input node respectively, and is used for voltage dividing the power supply voltage to generate the first reference voltage and output to the first input node.

[0015] The first comparison unit is connected with the first input node, the charge-discharge node and the first control end respectively, and is used for comparing the first reference voltage and the voltage of the charge-discharge node to output the first control signal to the first control end.

[0016] Optionally, the first voltage dividing unit comprises a first resistor and a second resistor; and the first comparison unit comprises a first comparator.

[0017] The first resistor and the second resistor are connected in series between the power input end and the pull-down end, and a series connection node of the first resistor and the second resistor is connected with the first input node.

[0018] The non-inverting input end of the first comparator is connected with the first input node, the inverting input end of the first comparator is connected with the charge-discharge node, and the output end of the first comparator is connected with the first control end.

[0019] Optionally, the second control sub-circuit comprises:

[0020] a second voltage dividing unit, connected with the second input node of the power input end respectively, and configured to divide the power voltage to generate the second reference voltage and output to the second input node;

[0021] a voltage control unit, connected with the scan output end and the third input node respectively, and configured to generate the state indication voltage based on the scan signal and output to the third input node;

[0022] a second comparison unit, connected with the second input node, the third input node and the second control end respectively, and configured to compare the second reference voltage and the state indication voltage to output the second control signal to the second control end.

[0023] Optionally, the second voltage dividing unit comprises a third resistor and a fourth resistor; the voltage control unit comprises a fifth resistor and a first capacitor; and the second comparison unit comprises a second comparator.

[0024] The third resistor and the fourth resistor are connected in series between the power input end and the pull-down end, and a series connection node of the third resistor and the fourth resistor is connected with the second input node.

[0025] The fifth resistor is connected between the third input node and the pull-down end, and the first capacitor is connected between the scan output end and the third input node.

[0026] The non-inverting input end of the second comparator is connected with the third input node, the inverting input end of the second comparator is connected with the second input node, and the output end of the second comparator is connected with the second control end.

[0027] Optionally, the switch circuit comprises:

[0028] a first switch sub-circuit, connected with the first control end, the power input end and the power output end respectively, and configured to control the on-off of the power input end and the power output end in response to the first control signal;

[0029] a second switch sub-circuit, connected with the power output end, the charge-discharge node, the pull-down end and a switching node respectively, and configured to control the on-off of the charge-discharge node and the pull-down end in response to the output voltage, and control the on-off of the charge-discharge node and the switching node;

[0030] a third switch sub-circuit, connected with the second control end, the switching node and the pull-down end respectively, and configured to control the on-off of the switching node and the pull-down end in response to the second control signal.

[0031] Optionally, the first switch sub-circuit comprises a single-contact relay.

[0032] A coil in the single-contact relay is connected between the first control terminal and the pull-down terminal, a common contact in the single-contact relay is connected with the power input terminal, and a normally open contact in the single-contact relay is used to be connected with the power output terminal.

[0033] Optionally, the second switch sub-circuit comprises a double-contact relay.

[0034] A coil in the double-contact relay is connected between the power output terminal and the pull-down terminal, a common contact in the double-contact relay is connected with the charge-discharge node, a normally closed contact in the double-contact relay is used to be connected with the pull-down terminal, and a normally open contact in the double-contact relay is used to be connected with the switching node.

[0035] Optionally, the automatic restart circuit further comprises a sixth resistor connected between the normally closed contact and the pull-down terminal.

[0036] Optionally, the third switch sub-circuit comprises an optoelectronic coupler.

[0037] An optical emitter in the optoelectronic coupler is connected between the second control terminal and the pull-down terminal, and an optical receiver in the optoelectronic coupler is connected between the switching node and the pull-down terminal.

[0038] Optionally, the automatic restart circuit further comprises:

[0039] A charging circuit connected with the power input terminal and the charge-discharge node respectively, and used to charge the charge-discharge node based on the power voltage.

[0040] Optionally, the charging circuit comprises a seventh resistor and a second capacitor.

[0041] The seventh resistor is connected between the power input terminal and the charge-discharge node, and the second capacitor is connected between the charge-discharge node and the pull-down terminal.

[0042] In another aspect, an automatic restart method of a display panel is provided, which is applied to the automatic restart circuit of the display panel as described in the above aspect, and the method comprises:

[0043] When the scan signal output from the scan output terminal is normal, the control circuit outputs a first control signal of a first level to the first control terminal based on a power supply voltage input from the power input terminal and a voltage of the charge-discharge node, and outputs a second control signal of the first level to the second control terminal based on the power supply voltage and the scan signal; the switch circuit controls the power input terminal and the power output terminal to be conductive in response to the first control signal of the first level, controls the charge-discharge node and the pull-down terminal to be disconnected in response to an output voltage output from the power output terminal, and controls the charge-discharge node and the pull-down terminal to be conductive in response to the output voltage and the second control signal of the first level, so that the charge-discharge node is discharged.

[0044] When the scan signal is abnormal, the control circuit outputs a second control signal of a second level to the second control terminal based on the power supply voltage and the scan signal; the switch circuit controls the charge-discharge node and the pull-down terminal to be disconnected in response to the output voltage and the second control signal of the second level, so that the charge-discharge node is charged; when the charge-discharge node is charged to be greater than the power supply voltage, the control circuit outputs a first control signal of a second level to the first control terminal based on the power supply voltage and the voltage of the charge-discharge node; the control circuit controls the power input terminal and the power output terminal to be disconnected in response to the first control signal of the second level, and controls the charge-discharge node and the pull-down terminal to be conductive in response to the output voltage, so that the charge-discharge node is discharged again; when the charge-discharge node is discharged to be less than the power supply voltage, the control circuit outputs a first control signal of a first level to the first control terminal based on the power supply voltage and the voltage of the charge-discharge node.

[0045] In another aspect, a display module is provided, which includes a display panel, a scan circuit, a power management circuit, and an automatic restart circuit of the display panel as described in the above aspect.

[0046] The automatic restart circuit is connected with the scan output terminal of the scan circuit and the power management circuit, and is further connected with a power input terminal; the scan output terminal of the scan circuit is further connected with pixels in the display panel; the power management circuit is further connected with the display panel.

[0047] The scan circuit is configured to output a scan signal to the pixels in the display panel through the scan output terminal.

[0048] The automatic restart circuit is configured to control the power input terminal and the power management circuit to be conductive or disconnected based on the scan signal.

[0049] The power management circuit is configured to supply power to the display panel based on a power supply voltage provided by the power input terminal.

[0050] To sum up, the technical scheme provided by the embodiments of the present application can bring at least the following beneficial effects:

[0051] The application provides an automatic restart circuit and method of a display panel, and a display module. In the automatic restart circuit, the control circuit and the switch circuit can cooperate with each other to control the charging and discharging node to be charged or discharged based on the scanning signal reflecting whether the display panel is faulty, and to control the power input end and the power management circuit to be connected or disconnected based on the voltage of the charging and discharging node. Therefore, when the display panel is faulty, the power input end and the power management circuit can be disconnected to make the power management circuit stop supplying power to the display panel and control the display panel to shut down, and when the display panel is normal, the power input end and the power management circuit can be connected to make the power management circuit supply power to the display panel again and control the display panel to start up, thereby completing an automatic restart of the display panel. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. 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.

[0053] Figure 1 is a structural schematic diagram of an automatic restart circuit provided by the embodiments of the present application;

[0054] Figure 2 is a structural schematic diagram of another automatic restart circuit provided by the embodiments of the present application;

[0055] Figure 3 is a structural schematic diagram of still another automatic restart circuit provided by the embodiments of the present application;

[0056] Figure 4 is a circuit structural schematic diagram of an automatic restart circuit provided by the embodiments of the present application;

[0057] Figure 5 is a working schematic diagram of an automatic restart circuit provided on the basis of the structure shown in Figure 4

[0058] Figure 6 is a working schematic diagram of another automatic restart circuit provided on the basis of the structure shown in Figure 4

[0059] Figure 7 is a working schematic diagram of still another automatic restart circuit provided on the basis of the structure shown in Figure 4 ​​​

[0060] Figure 8 is a simulation schematic diagram of an automatic restart circuit provided on the basis of the structure shown in Figure 4

[0061] Figure 9 is a simulation schematic diagram of another automatic restart circuit provided on the basis of the structure shown in Figure 4

[0062] Figure 10 is a flow schematic diagram of an automatic restart method provided by an embodiment of the present application.

[0063] Figure 11 is a structural schematic diagram of a display module provided by an embodiment of the present application. DETAILED DESCRIPTION

[0064] In order to make the purposes, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0065] A cathode ray tube (CRT) is one of the earliest forms of electronic display technology. With the development of display technology, a series of new display technologies such as plasma display technology, liquid crystal display (LCD) technology, light emitting diode (LED) display technology and organic light emitting diode (OLED) display technology have emerged. Display color has gradually developed from black and white to color, the PPI (i.e., pixels per inch, PPI, used to represent resolution) of display products has been increasing, the thickness of display products has been decreasing, and the form of display products has developed from flat to curved, folding and sliding. The application scenarios of display products have also expanded from mobile phones, watches, medical devices, industrial control, vehicle-mounted to aviation, involving various fields. The display control system has also developed from controlling the display of 1 panel to controlling the display of multiple panels, and even in the aircraft system in the aviation field, it can control the display of hundreds of panels. For example, each seat on a large aircraft currently has an independent display screen, and the display control system on the aircraft can control the display screen on each seat to display. However, when a display screen fails (e.g., crashes) and cannot display normally, the system cannot automatically restart the single screen, and the screen cannot be restored to normal display.

[0066] ​​Based on this, strict requirements are put forward for the reliability of the screen, but the screen still cannot avoid problems due to the inability to automatically restart. To solve this problem, the embodiments of the present application provide an automatic restart circuit, which can automatically restart the display panel (i.e., display screen or screen) in time when the display panel fails, so as to ensure that the display panel can recover to normal. The automatic restart circuit can be applied in various fields, especially in the aviation or vehicle-mounted field of multiple screens. The automatic restart circuit not only can improve the adaptability of the display panel in different application systems, without the need for the display control system to detect and restart the single screen, but also can improve the display safety, so that the display screen can still restart and recover to normal after crashing.

[0067] Optionally, the embodiments of the present application take OLED display technology as an example for illustration. OLED is also known as organic electroluminescence display or organic light-emitting semiconductor. OLED can emit light through the injection and recombination of carriers. The luminous intensity is proportional to the injected current. Under the action of an electric field, the holes generated by the anode and the electrons generated by the cathode will move and be injected into the hole transport layer and the electron transport layer, respectively, and migrate to the light-emitting layer. When the two meet in the light-emitting layer, energy excitons are generated, thereby exciting light-emitting molecules to finally produce visible light.

[0068] Figure 1 is a structural schematic diagram of an automatic restart circuit of a display panel provided by the embodiments of the present application. As shown in Figure 1 , the automatic restart circuit 00 includes a control circuit 01 and a switch circuit 02.

[0069] The control circuit 01 is connected with a power input end Vin, a charge-discharge node N01, a scan output end Gout, a first control end O1 and a second control end O2, respectively. The control circuit 01 is configured to output a first control signal to the first control end O1 based on a power voltage input by the power input end Vin and a voltage of the charge-discharge node N01, and output a second control signal to the second control end O2 based on the power voltage and a scan signal output by the scan output end Gout.

[0070] It can be understood that the power voltage can be used for the power management circuit to supply power to the display panel. The scan signal can be used to drive the display panel after the power management circuit supplies power to the display panel. Under the control of the power supply of the power management circuit and the driving of the scan signal, the pixels in the display panel can emit light, and the display panel can start and display a picture.

[0071] The power management circuit, also known as the power management integrated circuit (PMIC), uses a power supply voltage of approximately 3.3V, supplied by a customer to the output terminal Vin. Here, "customer" refers to the client application. For example, in automotive applications, the client application could refer to the vehicle's infotainment system. Of course, the 3.3V figure is merely illustrative; the power supply voltage can vary depending on the specific scenario. The PMIC connects to the drive circuit that powers the display panel and supplies power to it based on the power supply voltage, enabling the drive circuit to drive the display panel. The drive circuit may include, for example, a timing controller (TCON) and an IC integrated on a chip-on-film (COF) substrate. The drive circuit and PMIC are typically mounted on a printed circuit board (PCB) and bonded to the display panel via the COF.

[0072] In addition to the drive circuit described above, combined with Figure 1 As can be seen, the display module can also include a scanning circuit. The scanning output terminal Gout can refer to the output terminal of the scanning circuit. The output terminal of the scanning circuit is generally connected to the pixels on the display panel and is used to output scanning signals to the pixels via the scanning output terminal Gout to drive the pixels to emit light. For example, the scanning circuit can be a gate driving circuit, and the scanning signal can be, for example, a gate scanning signal. Furthermore, considering the narrow bezel design, the scanning circuit is usually integrated on the display panel using array substrate row driving (gate driver on array) technology, hence it can also be called a GOA circuit or GOA.

[0073] A GOA typically comprises multiple cascaded GOA units. The scan output terminal Gout of these multiple GOA units can be connected to multiple rows of pixels in the display panel to output scan signals to those rows. When the display panel malfunctions and cannot display normally, the scan signal output through the scan output terminal Gout will be abnormal, such as a continuous high level (1) or a low level (0). When the display panel is not malfunctioning, the scan signal output through the scan output terminal Gout will be normal, such as a sine wave signal. Based on this, this embodiment of the application sets a control circuit 01 to output a second control signal based on the scan signal, which can be used to indicate whether the display panel has malfunctioned, prompting whether to automatically restart the display panel.

[0074] For example, the control circuit 01 can compare the voltage at the charge-discharge node N01 with the supply voltage, and output a first control signal at a different level to the first control terminal O1 according to the comparison result. For example, when the voltage at the charge-discharge node N01 is less than the supply voltage, the control circuit 01 can output a first control signal at a first level to the first control terminal O1; when the voltage at the charge-discharge node N01 is greater than the supply voltage, the control circuit 01 can output a first control signal at a second level to the first control terminal O1.

[0075] Similarly, the control circuit 01 can also compare the scan signal with the supply voltage, and output a second control signal at a different level to the second control terminal O2 according to the comparison result. For example, when the scan signal is greater than the supply voltage, the control circuit 01 can output a second control signal at a first level to the second control terminal O2; when the scan signal is less than the supply voltage, the control circuit 01 can output a second control signal at a second level to the second control terminal O2.

[0076] Of course, the above comparison manners are only illustrative. For example, in some other embodiments, the control circuit 01 can output a first control signal at a first level when the voltage at the charge-discharge node N01 is greater than the supply voltage, and output a first control signal at a second level when the voltage at the charge-discharge node N01 is less than the supply voltage. It can be understood that the supply voltage compared here can refer to a reference voltage obtained based on the supply voltage rather than the supply voltage itself, and the scan signal compared can refer to a voltage determined based on the scan signal rather than the scan signal itself.

[0077] Optionally, the first level can refer to an effective level for controlling the switch to be on or closed, and the second level can refer to an ineffective level for controlling the switch to be off or opened. Thus, the control signal at the first level (e.g., the first control signal or the second control signal) can refer to an on control signal, and the control signal at the second level can refer to an off control signal. Moreover, the first level can be a high level relative to the second level. That is, the first level can be a high level 1, and the second level can be a low level 0. Of course, in some other embodiments, the first level can also be a low level relative to the second level.

[0078] The switch circuit 02 is connected with the supply input terminal Vin, the supply output terminal Vout, the first control terminal O1, the second control terminal O2, the charge-discharge node N01, and the pull-down terminal V0. The switch circuit 02 is configured to control the connection between the supply input terminal Vin and the supply output terminal Vout in response to the first control signal, control the connection between the charge-discharge node N01 and the pull-down terminal V0 in response to the output voltage output through the supply output terminal Vout, and control the connection between the charge-discharge node N01 and the pull-down terminal V0 in response to the output voltage and the second control signal.

[0079] The power output terminal Vout is used to be connected with the power management circuit PMIC. That is, as shown in the embodiment of the present application, the PMIC is not directly connected with the power input terminal Vin, but is indirectly connected with the power input terminal Vin through the switch circuit 02 in the automatic restart circuit. When the switch circuit 02 controls the power input terminal Vin and the power output terminal Vout to be conductive, the power voltage can be transmitted to the PMIC, so that the PMIC supplies power to the display panel based on the power voltage to further start the display panel to work. When the switch circuit 02 controls the power input terminal Vin and the power output terminal Vout to be disconnected, the power voltage cannot be transmitted to the PMIC, so that the PMIC stops supplying power to the display panel to make the display panel shut down. In this way, by controlling the power input terminal Vin and the power output terminal Vout to be conductive or disconnected through the switch circuit 02, the PMIC can be triggered to complete the automatic restart of the display panel. Figure 1

[0080] In addition, when the charge-discharge node N01 is disconnected with the pull-down terminal V0, the charge-discharge node N01 is charged; when the charge-discharge node N01 is conductive with the pull-down terminal V0, the charge-discharge node N01 is discharged. That is, when the charge-discharge node N01 is conductive with the pull-down terminal V0, the voltage on the charge-discharge node N01 can be released to the pull-down terminal V0, so as to complete the discharging.

[0081] Optionally, the pull-down terminal V0 may, for example, be a ground terminal GND as shown in the figure, and correspondingly, the voltage on the charge-discharge node N01 can be released to the ground. Alternatively, the pull-down terminal V0 can also be any terminal capable of controlling the voltage on the charge-discharge node N01 to be released, such as a pull-down power terminal VSS. The embodiment of the present application takes the ground terminal GND as the pull-down terminal V0 as an example for description. It can be understood that the voltage of the signal provided by the pull-down terminal V0 is less than the power voltage provided by the power input terminal Vin. Generally, the power voltage provided by the power input terminal Vin is greater than 0, and the voltage of the signal provided by the pull-down terminal V0 is less than 0. Figure 1 For example, the switch circuit 02 can control the power input terminal Vin and the power output terminal Vout to be conductive when the level of the first control signal is a first level. At this time, the power voltage provided by the power input terminal Vin can be transmitted to the power output terminal Vout, that is, the output voltage output through the power output terminal Vout can be the power voltage, and then the PMIC can supply power to the display panel based on the power voltage to further start the display panel to work. In addition, the switch circuit 02 can control the power input terminal Vin and the power output terminal Vout to be disconnected when the level of the first control signal is a second level. At this time, the power voltage cannot be transmitted to the power output terminal Vout, and then the PMIC cannot supply power to the display panel, so that the display panel is shut down.

[0082] ​​

[0083] Similarly, the switch circuit 02 can control the charging and discharging node N01 to be disconnected from the pull-down terminal V0 in response to the output voltage when the output voltage output through the power output terminal Vout is the power voltage, that is, when the power input terminal Vin and the power output terminal Vout are connected. In addition, the switch circuit 02 can control the charging and discharging node N01 to be connected to the pull-down terminal V0 when the power input terminal Vin and the power output terminal Vout are disconnected, so that the voltage on the charging and discharging node N01 can be discharged to the pull-down terminal V0 and discharged. That is, when the power voltage is not output through the power output terminal Vout, the switch circuit 02 can control the charging and discharging node N01 to be connected to the pull-down terminal V0 by default; when the power voltage is output through the power output terminal Vout, the switch circuit 02 can control the charging and discharging node N01 to be disconnected from the pull-down terminal V0 only in response to the output voltage.

[0084] In addition, the switch circuit 02 can control the charging and discharging node N01 to be connected to the pull-down terminal V0 in response to the output voltage and the first level of the second control signal when the output voltage output through the power output terminal Vout is the power voltage and the level of the second control signal is the first level. In addition, the switch circuit 02 can control the charging and discharging node N01 to be disconnected from the pull-down terminal V0 in response to the output voltage and the second level of the second control signal when the output voltage output through the power output terminal Vout is the power voltage and the level of the second control signal is the second level. That is, when the power voltage is output through the power output terminal Vout, the switch circuit 02 can control the connection and disconnection of the charging and discharging node N01 and the pull-down terminal V0 in combination with the power voltage and the level of the second control signal, so that the charging and discharging node N01 is charged or discharged.

[0085] In combination with the foregoing, when the voltage of the charging and discharging node N01 is charged to be greater than the reference voltage generated based on the power voltage, the control circuit 01 can output the first control signal of the second level to the first control terminal O1, so that the power input terminal Vin and the power output terminal Vout are disconnected, thereby shutting down the display panel; and when the voltage of the charging and discharging node N01 is less than the reference voltage generated based on the power voltage, the control circuit 01 can output the first control signal of the first level to the first control terminal O1, so that the power input terminal Vin and the power output terminal Vout are connected, thereby starting up the display panel. Thus, the automatic restart of the display panel is realized.

[0086] It can be understood that, since the second control signal is a signal output by the control circuit 01 based on the scan signal, and the scan signal can indicate whether the display panel is faulty, the control circuit 01 can output the second control signal of the corresponding level based on the current situation of the display panel (i.e., whether it is faulty or normal) to control the switch circuit 02 to control the connection and disconnection of the charging and discharging node N01 and the pull-down end V0, so as to charge or discharge the charging and discharging node N01, thereby realizing the automatic restart of the display panel.

[0087] For example, as described above, when the display panel is faulty, the voltage determined based on the scan signal can be less than the reference voltage determined based on the power supply voltage, the control circuit 01 can output the second control signal of the second level to make the switch circuit 02 control the disconnection of the charging and discharging node N01 and the pull-down end V0, so as to charge the charging and discharging node N01, and then the control circuit 01 can output the first control signal of the second level to make the power input end Vin and the power output end Vout disconnected, so as to automatically shut down the display panel. When the display panel is working normally, i.e., not faulty, the voltage determined based on the scan signal can be greater than the reference voltage determined based on the power supply voltage, the control circuit 01 can output the second control signal of the first level to make the switch circuit 02 control the connection of the charging and discharging node N01 and the pull-down end V0, so as to discharge the charging and discharging node N01, and then the control circuit 01 can output the first control signal of the first level to make the power input end Vin and the power output end Vout connected, so as to automatically start the display panel.

[0088] That is, based on the above example, the voltage determined based on the scan signal being greater than the reference voltage determined based on the power supply voltage can be used to indicate that the display panel is normal. At this time, the voltage of the charging and discharging node can be made less than the reference voltage determined based on the power supply voltage, and then the control circuit 01 and the switch circuit 02 can be cooperated to control the connection of the power input end Vin and the power output end Vout, so as to normally start the display of the display panel. The voltage determined based on the scan signal being less than the reference voltage determined based on the power supply voltage can be used to indicate that the display panel is faulty. At this time, the voltage of the charging and discharging node can be made greater than the reference voltage determined based on the power supply voltage, and then the control circuit 01 and the switch circuit 02 can be cooperated to control the disconnection of the power input end Vin and the power output end Vout, so as to shut down the display panel to stop the display. Of course, if the comparison mode changes, the control mode here also changes flexibly.

[0089] In summary, the application provides an automatic restart circuit of a display panel. In the automatic restart circuit, the control circuit and the switch circuit can cooperate with each other to control the charging and discharging node to be charged or discharged based on the scan signal reflecting whether the display panel is faulty, and control the power input end and the power management circuit to be connected or disconnected based on the voltage of the charging and discharging node. Therefore, when the display panel is faulty, the power management circuit can be controlled to stop supplying power to the display panel to shut down the display panel, and when the display panel is normal, the power management circuit can be controlled to supply power to the display panel to start up the display panel, thereby completing an automatic restart of the display panel.

[0090] Optionally, Figure 2 is a structural schematic diagram of another automatic restart circuit provided by the application. As Figure 2 indicated, the control circuit 01 can include a first control sub-circuit 011 and a second control sub-circuit 012.

[0091] The first control sub-circuit 011 can be connected with the power input end Vin, the charging and discharging node N01 and the first control end O1 respectively. The first control sub-circuit 011 can be configured to generate a first reference voltage based on the power voltage, compare the first reference voltage and the voltage of the charging and discharging node N01, and output a first control signal to the first control end O1.

[0092] For example, the first control sub-circuit 011 can divide the power voltage to generate the first reference voltage. Then, the first control sub-circuit 011 can output a first control signal of a first level to the first control end O1 when the first reference voltage is greater than the voltage of the charging and discharging node N01, and output a first control signal of a second level to the first control end O1 when the first reference voltage is less than the voltage of the charging and discharging node N01.

[0093] The second control sub-circuit 012 can be connected with the power input end Vin, the scan output end Gout and the second control end O2 respectively. The second control sub-circuit 012 can be configured to generate a second reference voltage based on the power voltage, generate a state indication voltage based on the scan signal, compare the second reference voltage and the state indication voltage, and output a second control signal to the second control end O2.

[0094] For example, the second control sub-circuit 012 can also divide the power supply voltage to generate a second reference voltage, and can generate a state indication voltage based on the scan circuit. Then, the second control sub-circuit 012 can output a second control signal of a first level to the second control end O2 when the second reference voltage is less than the state indication voltage; the second control sub-circuit 012 can output a second control signal of a second level to the second control end O2 when the second reference voltage is greater than the state indication voltage. Wherein, in combination with the foregoing, the state indication voltage obtained based on the scan signal can be used to indicate whether the display panel has a fault, to further indicate whether the display panel needs to be automatically restarted.

[0095] That is, the first control sub-circuit and the second control sub-circuit can respectively output the first control signal and the second control signal to the first control end O1 and the second output end O2.

[0096] Optionally, Figure 3 is another structure diagram of an automatic restart circuit provided by an embodiment of the present application. As shown in the figure, Figure 3 The first control sub-circuit 011 can include a first voltage dividing unit 0111 and a first comparison unit 0112.

[0097] The first voltage dividing unit 0111 can be connected with the power supply input end Vin and the first input node N1 respectively. And the first voltage dividing unit 0111 can be used to divide the power supply voltage to obtain a first reference voltage and output to the first input node N1.

[0098] That is, as described above, the first control sub-circuit 011 can divide the power supply voltage by the first voltage dividing unit 0111 therein to generate a first reference voltage.

[0099] The first comparison unit 0112 can be connected with the first input node N1, the charge-discharge node N01 and the first control end O1 respectively. And the first comparison unit 0112 can be used to compare the first reference voltage and the voltage of the charge-discharge node N01 to output the first control signal to the first control end O1.

[0100] That is, as described above, the first control sub-circuit 011 can compare the first reference voltage and the voltage of the charge-discharge node N01 by the first comparison unit 0112 therein to output the first control signal based on the comparison result.

[0101] Optionally, continuing to refer to Figure 3 It can be seen that the second control sub-circuit 012 can include a second voltage dividing unit 0121, a voltage control unit 0122 and a second comparison unit 0123.

[0102] The second voltage dividing unit 0121 can be connected with the power input terminal Vin and the second input node N2 respectively. And the second voltage dividing unit 0121 can be configured to divide the power voltage to generate the second reference voltage and output to the second input node N2.

[0103] That is, as described above, the second control sub-circuit 012 can obtain the second reference voltage by dividing the power voltage through the second voltage dividing unit 0121 therein.

[0104] The voltage control unit 0122 can be connected with the scan output terminal Gout and the third input node N3 respectively. And the voltage control unit 0122 can be configured to generate the state indicating voltage based on the scan signal and output to the third input node N3.

[0105] That is, as described above, the second control sub-circuit 012 can obtain the state indicating voltage based on the scan signal through the voltage control unit 0122 therein. As such, the voltage control unit 0122 can control the voltage of the third input node N3 based on the scan signal to output the state indicating voltage to the third input node N3.

[0106] The second comparison unit 0123 can be connected with the second input node N2, the third input node N3 and the second control terminal O2 respectively. And the second comparison unit 0123 can be configured to compare the second reference voltage and the state indicating voltage to output the second control signal to the second control terminal O2.

[0107] That is, as described above, the second control sub-circuit 012 can compare the second reference voltage and the state indicating voltage through the second comparison unit 0123 therein to output the second control signal based on the comparison result.

[0108] Optionally, continuing to refer to Figure 2 and Figure 3 It can be seen that the switch circuit 02 can include: a first switch sub-circuit 021, a second switch sub-circuit 022 and a third switch sub-circuit 023.

[0109] The first switch sub-circuit 021 can be connected with the first control terminal O1, the power input terminal Vin and the power output terminal Vout respectively. And the first switch sub-circuit 021 can be configured to control the connection and disconnection of the power input terminal Vin and the power output terminal Vout in response to the first control signal.

[0110] For example, the first switch sub-circuit 021 can control the power input terminal Vin and the power output terminal Vout to be connected when the level of the first control signal is the first level; the first switch sub-circuit 021 can control the power input terminal Vin and the power output terminal Vout to be disconnected when the level of the first control signal is the second level.

[0111] The second switch sub-circuit 022 can be connected with the power output terminal Vout, the charge-discharge node N01, the pull-down terminal V0 and the relay node N02 respectively. The second switch sub-circuit 022 can be used to control the on-off of the charge-discharge node N01 and the pull-down terminal V0, and control the on-off of the charge-discharge node N01 and the relay node N02 in response to the output voltage.

[0112] For example, when the level of the output voltage is the first level, the second switch sub-circuit 022 can control the charge-discharge node N01 to be disconnected with the pull-down terminal V0, and control the charge-discharge node N01 to be connected with the relay node N02; when the level of the output voltage is the second level, the second switch sub-circuit 022 can control the charge-discharge node N01 to be connected with the pull-down terminal V0, and control the charge-discharge node N01 to be disconnected with the relay node N02. The output voltage is the power voltage transmitted through the power input terminal Vin. When the power input terminal Vin and the power output terminal Vout are connected, the output voltage is the power voltage, and at this time, the level of the output voltage is considered to be the first level; when the power input terminal Vin and the power output terminal Vout are disconnected, the output voltage is 0, and at this time, the level of the output voltage is considered to be the second level.

[0113] The third switch sub-circuit 023 can be connected with the second control terminal O2, the relay node N02 and the pull-down terminal V0 respectively. The third switch sub-circuit 023 can be used to control the on-off of the relay node N02 and the pull-down terminal V0 in response to the second control signal.

[0114] For example, when the level of the second control signal is the first level, the third switch sub-circuit 023 can control the relay node N02 to be connected with the pull-down terminal V0; when the level of the second control signal is the second level, the third switch sub-circuit 023 can control the relay node N02 to be disconnected with the pull-down terminal V0.

[0115] That is, in combination with the foregoing, the second switch sub-circuit 022 and the third switch sub-circuit 023 can cooperate with each other to control the direct on-off between the charge-discharge node N01 and the pull-down terminal V0 in response to the output voltage, or control the direct on-off between the charge-discharge node N01 and the pull-down terminal V0 through the third switch sub-circuit 023 in response to the output voltage and the second control signal.

[0116] Optionally, continuing to refer to Figure 2 and Figure 3 It can be seen that the automatic restart circuit can further include a charging circuit 03.

[0117] The charging circuit 03 can be connected with the power input terminal Vin and the charge-discharge node N01 respectively. And the charging circuit 03 can be used to charge the charge-discharge node N01 based on the power voltage. Of course, the precondition of charging is that the switch circuit 02 controls the charge-discharge node N01 to be disconnected with the pull-down terminal V0.

[0118] Optionally, in combination with Figure 2 and Figure 3 It can also be seen that the first comparison unit 0112 and the second comparison unit 0123 can also be connected with the power input terminal Vin to work under the control of the power voltage provided by the power input terminal Vin. Of course, each unit can also be connected with the pull-down terminal V0 (such as the ground terminal GND).

[0119] Optionally, Figure 4 is a circuit structure schematic diagram of an automatic restart circuit provided by an embodiment of the present application. As Figure 4 shown, the first voltage dividing unit 0111 can include a first resistor R1 and a second resistor R2. The first comparison unit 0112 can include a first comparator Comp1.

[0120] The first resistor R1 and the second resistor R2 can be connected in series between the power input terminal Vin and the pull-down terminal V0, and the series node of the first resistor R1 and the second resistor R2 can be connected with the first input node N1.

[0121] Therefore, the first reference voltage can be obtained by the first resistor R1 and the second resistor R2 to divide the power voltage provided by the power input terminal Vin and transmitted to the first input node N1.

[0122] The non-inverting input terminal + of the first comparator Comp1 can be connected with the first input node N1, the inverting input terminal - of the first comparator Comp1 can be connected with the charge-discharge node N01, and the output terminal of the first comparator Comp1 can be connected with the first control terminal O1.

[0123] Therefore, as recorded in the foregoing, the first comparison unit 0112 can output the first control signal of the first level (i.e. high level 1) to the first control terminal O1 when the first reference voltage transmitted to the first input node N1 is greater than the voltage of the charge-discharge node N01; the first comparison unit 0112 can output the first control signal of the second level (i.e. low level 0) to the first control terminal O1 when the first reference voltage transmitted to the first input node N1 is less than the voltage of the charge-discharge node N01. Of course, if the non-inverting input terminal + and the inverting input terminal - of the first comparator Comp1 are interchanged, the working principle of the first comparison unit 0112 will also change. Here, it will not be described again.

[0124] Optionally, continuing to refer to Figure 4It can be seen that the second voltage dividing unit 0121 can include a third resistor R3 and a fourth resistor R4. The voltage control unit 0122 can include a fifth resistor R5 and a first capacitor C1. The second comparison unit 0123 can include a second comparator Comp2.

[0125] The third resistor R3 and the fourth resistor R4 can be connected in series between the power input terminal Vin and the pull-down terminal V0, and a node of the third resistor R3 and the fourth resistor R4 can be connected to the second input node N2.

[0126] Therefore, the power voltage provided by the power input terminal Vin can be divided by the third resistor R3 and the fourth resistor R4 to obtain the second reference voltage, and transmitted to the second input node N2.

[0127] It can be understood that if the resistance values of the third resistor R3, the fourth resistor R4, the first resistor R1 and the second resistor R2 are the same, the first reference voltage and the second reference voltage obtained by voltage division are the same; otherwise, they are different. The present embodiment does not limit the size relationship between the first reference voltage and the second reference voltage.

[0128] The fifth resistor R5 can be connected between the third input node N3 and the pull-down terminal V0, and the first capacitor C1 can be connected between the scan output terminal Gout and the third input node N3.

[0129] Therefore, the voltage of the third input node N3 can be controlled based on the scan signal output through the scan output terminal Gout by the fifth resistor R5 and the first capacitor C1. Since the voltage of the third input node N3 can reflect the state of whether the display panel fails, the voltage of the third input node N3 can be named as a state indication voltage.

[0130] The non-inverting input terminal + of the second comparator Comp2 can be connected to the third input node N3, the inverting input terminal - of the second comparator Comp2 can be connected to the second input node N2, and the output terminal of the second comparator Comp2 can be connected to the second control terminal O2.

[0131] Thus, as recorded in the foregoing, the second comparison unit 0123 can output a second control signal of a first level (i.e., high level 1) to the second control end O2 when the second reference voltage transmitted to the second input node N2 is less than the state indication voltage of the third input node N3; the second comparison unit 0123 can output a second control signal of a second level (i.e., low level 0) to the second control end O2 when the second reference voltage transmitted to the second input node N2 is greater than the state indication voltage of the third input node N3. Of course, if the non-inverting input end + and the inverting input end - of the second comparator Comp2 are interchanged, the working principle of the first comparison unit 0112 will also change accordingly. Here, no longer described.

[0132] Optionally, with reference to Figure 4 It can also be seen that the first comparator Comp1 and the second comparator Comp2 can be a comparator composed of an amplifier. And each comparator can also be connected with the power input end Vin and the pull-down end V0 to work under the pressure difference of the power supply voltage provided by the power input end Vin and the power signal provided by the pull-down end V0.

[0133] Optionally, with reference to Figure 4 It can be seen that the first switch sub-circuit 021 can include a single-contact relay.

[0134] The coil L1 in the single-contact relay can be connected between the first control end O1 and the pull-down end V0, the common contact in the single-contact relay can be connected with the power input end Vin, and the normally open contact J1 in the single-contact relay can be used to be connected with the power output end Vout.

[0135] That is, the single-contact relay can be a normally open single-contact relay. Thus, when the level of the first control signal provided by the first control end O1 is the second level, i.e., in the case of power failure, the normally open contact J1 in the single-contact relay can be disconnected with the power output end Vout, at this time, it can be considered that the single-contact relay is open. When the level of the first control signal provided by the first control end O1 is the first level, i.e., in the case of power on, the normally open contact J1 in the single-contact relay can be connected with the power output end Vout, at this time, it can be considered that the single-contact relay is closed and conducted.

[0136] Optionally, with reference to Figure 4 It can be seen that the second switch sub-circuit 022 can include a double-contact relay.

[0137] The coil L2 in the double-contact relay can be connected between the power output terminal Vout and the pull-down terminal V0, the common contact in the double-contact relay can be connected with the charge-discharge node N01, the normally closed contact J2 in the double-contact relay can be used to connect with the pull-down terminal V0, and the normally open contact J3 in the double-contact relay can be used to connect with the switching node N02.

[0138] Thus, when the power input terminal Vin is disconnected from the power output terminal Vout, and no power voltage is transmitted to the power output terminal Vout, i.e. when power is off, the normally closed contact J2 of the double-contact relay can be connected with the pull-down terminal V0, and the normally open contact J3 of the double-contact relay is disconnected from the switching node N02. When the power input terminal Vin is connected with the power output terminal Vout, and power voltage is transmitted to the power output terminal Vout, i.e. when power is on, the normally open contact J3 of the double-contact relay can be connected with the switching node N02, and the normally closed contact J2 of the double-contact relay can be disconnected from the pull-down terminal V0. That is, when power is off, the common contact of the double-contact relay can be at the normally closed contact J2, so that the charge-discharge node N01 is directly connected with the pull-down terminal V0; when power is on, the common contact of the double-contact relay can be at the normally open contact J3, so that the charge-discharge node N01 is directly connected with the switching node N02 and indirectly connected with the pull-down terminal V0 through the third switch sub-circuit 023. When the third switch sub-circuit 023 controls the switching node N02 and the pull-down terminal V0 to be connected, the charge-discharge node N01 can be connected with the pull-down terminal V0; and when the third switch sub-circuit 023 controls the switching node N02 and the pull-down terminal V0 to be disconnected, the charge-discharge node N01 can be disconnected from the pull-down terminal V0.

[0139] Optionally, continuing to refer to Figure 4 It can be seen that the automatic restart circuit can further include a sixth resistor R6 connected between the normally closed contact and the pull-down terminal V0. The sixth resistor R6 can serve the purpose of current limiting.

[0140] Optionally, continuing to refer to Figure 4 It can be seen that the third switch sub-circuit 023 can include an optoelectronic coupler.

[0141] The light emitter LD in the optoelectronic coupler can be connected between the second control terminal O2 and the pull-down terminal V0, and the light receiver (i.e. optoelectronic receiver) LC in the optoelectronic coupler can be connected between the switching node N02 and the pull-down terminal V0.

[0142] Thus, the light emitter LD in the photoelectric coupler can emit light when the level of the second control signal provided by the second control terminal O2 is the first level, at which time, the light can irradiate on the light receiver LC, and the light receiver LC can generate a photoelectric current under the action of the photoelectric effect and be led out through the output terminal, so that the relay node N02 and the pull-down terminal V0 are turned on, and then the charge-discharge node N01 and the pull-down terminal V0 are turned on. On the basis of controlling the charge-discharge node N01 and the pull-down terminal V0 to be turned on, the voltage on the charge-discharge node N01 can be discharged to the pull-down terminal V0, that is, the voltage on the charge-discharge node N01 is continuously lowered to discharge the charge-discharge node N01. The light emitter LD in the photoelectric coupler can stop emitting light when the level of the second control signal provided by the second control terminal O2 is the second level, at which time, the light cannot irradiate on the light receiver LC, and the light receiver LC cannot generate a photoelectric current. At this time, the relay node N02 and the pull-down terminal V0 are disconnected, and then the charge-discharge node N01 and the pull-down terminal V0 can be disconnected. On the basis of controlling the charge-discharge node N01 and the pull-down terminal V0 to be disconnected, the charge-discharge node N01 can be charged by the charging circuit 03, so that the voltage on the charge-discharge node N01 is continuously raised to charge the charge-discharge node N01. Based on this, it can also be known that the photoelectric coupler is also called a photoelectric coupling switch, which is used to realize the conversion of electricity-optics-electricity.

[0143] Optionally, the light emitter LD may, for example, be an LED as shown in Figure 4 The light receiver LC may, for example, be a photodiode. And the light emitter LD and the light receiver LC can generally be packaged together for use as a photoelectric coupler.

[0144] Optionally, continuing to refer to Figure 4 It can be seen that the charging circuit 03 can include a seventh resistor R7 and a second capacitor C2.

[0145] The seventh resistor R7 can be connected between the power input terminal Vin and the charge-discharge node N01, and the second capacitor C2 can be connected between the charge-discharge node N01 and the pull-down terminal V0. That is, the charging circuit 03 can be an RC charging circuit as shown in Figure 4

[0146] Of course, Figure 4 The selection of devices of each circuit shown is only illustrative, and any device capable of realizing the above functions can be applied to the present application, and the embodiments of the present application do not limit this. For example, in some other embodiments, any of the first to third switch sub-circuits 021 to 023 can also be a switch composed of a transistor.

[0147] For example, in Figure 5 ​As shown in the structure, the first level is high level 1, the second level is low level 0, and the pull-down end V0 is the ground end GND. The working principle of the automatic restart circuit provided by the embodiment of the present application is described as follows:

[0148] It can be understood that, Figure 6 As shown in the circuit, it is a working schematic diagram of the automatic restart circuit in an unpowered state. The unpowered state can also refer to a state in which the customer system (i.e., the client) does not power on the display panel, and the power input end Vin does not receive a power voltage such as 3.3V. Among them, the common contact of the single-contact relay is disconnected with the normally open contact J1, the common contact of the double-contact relay is connected with the normally closed contact J2, and disconnected with the normally open contact J3, and the photoelectric coupler is not in action. On this basis, it can be known that the power input end Vin is disconnected with the power output end Vout; the charge-discharge node N01 is directly conducted with the ground end GND.

[0149] In the initial stage of powering on the display panel by the customer system (i.e., the client), that is, as Figure 6 As shown, when the power input end Vin receives a power voltage of 3.3V, the voltage of the first input node N1 (i.e., the first reference voltage obtained by dividing the power voltage) can be greater than the voltage of the charge-discharge node N01. At this time, the first comparator Comp1 can output a high level 1 first control signal to the first control end O1. In this way, the single-contact relay can be closed, that is, the common contact in the single-contact relay is connected with the normally open contact J1, and the power input end Vin and the power output end Vout can be conducted, and the power voltage provided by the power input end Vin can be transmitted to the power output end Vout through the single-contact relay as an output voltage. In this way, the common contact of the double-contact relay can be switched from the normally closed contact J2 to the normally open contact J3, that is, the charge-discharge node N01 is disconnected with the ground end GND and conducted with the switching node N02. Since the scanning circuit has not output a scanning signal through the scanning output end Gout at this time, the second comparator Comp is not working, the photoelectric coupler is not in action, and the switching node N02 is also disconnected with the ground end GND, so that the charge-discharge node N01 cannot be conducted with the ground end GND. Therefore, under the action of the RC charging circuit, the charge-discharge node N01 can be charged, and the voltage of the charge-discharge node N01 can continuously rise. At the same time, since the power voltage is output through the power output end Vout, it can be known that the PMIC can receive the power voltage, and then the PMIC can power the display panel based on the power voltage to start the display panel to work, and each circuit can start the initialization process. For example, the scanning circuit can start to prepare to output a scanning signal through the scanning output end Gout to light up the pixels in the display panel.

[0150] After the initialization is completed, as Figure 7As shown, assuming the display panel is not faulty, the scan signal output through the scan output terminal Gout can be Figure 7 The normal waveform shown is (e.g., a sine wave). Based on this, the voltage of the third input node N3 (i.e., the state indicator voltage described above) can continuously change high and low with the scanning signal, i.e., sometimes high level 1 and sometimes low level 0. When the voltage of the third input node N3 is greater than the voltage of the second input node N2 (i.e., the second reference voltage obtained by dividing the power supply voltage), the second comparator Comp2 can output a second control signal of high level 1 to the second control terminal O2. In this way, the light emitter LD in the optocoupler can emit light. After the light shines on the light receiver LC, the light receiver LC can generate current, and the optocoupler is turned on to connect the transition node N02 to the ground terminal GND, so that the charging and discharging node N01 is connected to the ground terminal GND through the optocoupler, thereby allowing the charging and discharging node N01 to be discharged, which also pulls the voltage of the charging and discharging node N01 low. With the voltage of the charging / discharging node N01 pulled low, the first comparator Comp1 can always maintain the output of the first control signal at a high level of 1, ensuring that the single-contact relay is closed, that is, ensuring that the power input terminal Vin and the power output terminal Vout are connected, so that the PMIC can reliably drive the display panel.

[0151] When the display panel malfunctions and cannot display normally, such as Figure 7 As shown, the scan signal output through the scan output terminal Gout at this time can be Figure 7 The abnormal waveform shown is, for example, consistently high level 1 or low level 0. Based on this, the voltage of the third input node N3 is always low level 0. That is, the voltage of the third input node N3 is always less than the voltage of the second input node N2. Consequently, the second comparator Comp2 can output a low level 0 second control signal to the second control terminal O2. This causes the light emitter LD in the optocoupler to stop emitting light, and the light receiver LC, not receiving light, cannot generate current. The optocoupler is turned off to disconnect the transition node N02 from ground GND, thus disconnecting the charging / discharging node N01 from ground GND. Therefore, under the action of the charging circuit 03, the charging / discharging node N01 will be charged, meaning its voltage will continuously rise. When the voltage of the charging / discharging node N01 rises to a level greater than that of the first input node N1, such as... Figures 4 to 7As shown in the path (1), the first comparator Comp1 can output a first control signal of low level 0 to the first control end O1, so that the single-contact relay is disconnected, that is, the common contact in the single-contact relay is disconnected from the normally open contact J1, and then the power input end Vin can be disconnected from the power output end Vout, and the power supply voltage can no longer be transmitted to the power output end Vout. Thus, not only can the common contact of the double-contact relay be switched from the normally open contact J3 to the normally closed contact J2, so that the charge-discharge node N01 is directly conducted with the ground end GND to discharge the charge-discharge node N01, that is, the voltage of the charge-discharge node N01 is released and lowered, but also the PMIC can stop supplying power to the display panel, so that the display panel is powered off. When the voltage of the charge-discharge node N01 is lowered to be less than the voltage of the first input node N1, as shown in the path (2), the first comparator Comp1 can output a first control signal of high level 1 to the first control end O1 again, so that the single-contact relay is closed, that is, the common contact in the single-contact relay is conducted with the normally open contact J1, and then the power input end Vin is conducted with the power output end Vout again, the power supply voltage is transmitted to the power output end Vout again, so that the PMIC supplies power to the display panel again to restart the display panel. Thus, the automatic restart for the display panel is completed. Figure 8 As shown in the path (1), the first comparator Comp1 can output a first control signal of low level 0 to the first control end O1, so that the single-contact relay is disconnected, that is, the common contact in the single-contact relay is disconnected from the normally open contact J1, and then the power input end Vin can be disconnected from the power output end Vout, and the power supply voltage can no longer be transmitted to the power output end Vout. Thus, not only can the common contact of the double-contact relay be switched from the normally open contact J3 to the normally closed contact J2, so that the charge-discharge node N01 is directly conducted with the ground end GND to discharge the charge-discharge node N01, that is, the voltage of the charge-discharge node N01 is released and lowered, but also the PMIC can stop supplying power to the display panel, so that the display panel is powered off. When the voltage of the charge-discharge node N01 is lowered to be less than the voltage of the first input node N1, as shown in the path (2), the first comparator Comp1 can output a first control signal of high level 1 to the first control end O1 again, so that the single-contact relay is closed, that is, the common contact in the single-contact relay is conducted with the normally open contact J1, and then the power input end Vin is conducted with the power output end Vout again, the power supply voltage is transmitted to the power output end Vout again, so that the PMIC supplies power to the display panel again to restart the display panel. Thus, the automatic restart for the display panel is completed.

[0152] Optionally, in combination with Figure 9 The example is described, Figure 8 A schematic diagram of the voltage of a third input node N3 changing with the scan signal output by a scan output end Gout is schematically shown. Figure 9 A timing simulation diagram of the automatic restart circuit is schematically shown.

[0153] In combination with Figure 9 It can be seen that the high and low levels of the scan signal can cause the voltage of the third input node N3 to change. Thus, whether the display panel fails can be reliably reflected by the voltage of the third input node N3.

[0154] In combination with Figures 1 to 4 It can be seen that when normally powered and the display panel does not fail, the scan output end Gout can normally output the scan signal, and then the voltage of the charge-discharge node N01 can be constantly refreshed, that is, the voltage of the charge-discharge node N01 can always be less than the voltage of the first input node N1, ensuring that the power input end Vin and the power output end Vout are always conducted, so that the PMIC can reliably drive the display panel to display the picture based on the power supply voltage provided by the power input end Vin. While the display panel fails (that is, Figure 10After the abnormality (e.g., the abnormality of the scan signal output by the scan output terminal Gout) is detected, the scan signal output by the scan output terminal Gout is abnormal (e.g., high or low), and the voltage of the third input node N3 is constant (e.g., low), the voltage of the charge-discharge node N01 cannot be refreshed. At this time, the voltage of the charge-discharge node N01 continuously increases under the action of the RC charging circuit. When the voltage of the charge-discharge node N01 is greater than the voltage of the first input node N1, the power input terminal Vin and the power output terminal Vout are disconnected, the PMIC stops supplying power to the display panel, the display panel is powered off, and the charge-discharge node N01 is directly connected to the ground terminal GND, so that the charge-discharge node N01 is discharged, and the voltage of the charge-discharge node N01 decreases again. When the voltage of the charge-discharge node N01 is less than the voltage of the first input node N1, the power input terminal Vin and the power output terminal Vout are connected again, and the PMIC supplies power to the display panel again, and the display panel is powered on. Thus, an automatic restart is completed.

[0155] Based on the foregoing, the embodiment of the present application provides an automatic restart circuit, also referred to as an Auto Reset circuit, for a display panel. The circuit can automatically detect whether the display panel has a fault, and can automatically restart the display panel from being powered off to being powered on when a fault of the display panel is detected. In this way, the adaptability of the display panel to different application systems can be improved. For example, the aviation system does not need to detect and restart a single screen. For another example, the safety of a display image of a vehicle-mounted display panel can be improved, so that the display panel can start up by itself after being powered off. In summary, the automatic restart circuit can improve the reliability, safety, and adaptability of the display panel, and can improve the competitiveness of a product. Of course, the automatic restart circuit is not limited to being applied to a display panel. For example, the automatic restart circuit can also be applied to any product that needs to be automatically restarted when a fault occurs.

[0156] In summary, an automatic restart circuit for a display panel is provided. In the automatic restart circuit, the control circuit and the switch circuit can cooperate with each other to control the charge-discharge node to be charged or discharged based on a scan signal reflecting whether the display panel has a fault, and to control the power input terminal and the power management circuit to be connected or disconnected based on the voltage of the charge-discharge node. Therefore, when the display panel has a fault, the power management circuit can be controlled to stop supplying power to the display panel by disconnecting the power input terminal and the power management circuit, so that the display panel is powered off. When the display panel returns to normal, the power management circuit can be controlled to supply power to the display panel again by connecting the power input terminal and the power management circuit, so that the display panel is powered on. Thus, an automatic restart of the display panel is completed.

[0157] This application also provides an automatic restart method for a display panel, which can be applied to, for example... Figure 11 In any of the automatic restart circuits shown. For example... Figure 11 As shown, the method includes:

[0158] Step 1001: When the scan signal output at the scan output terminal is normal, the control circuit outputs a first control signal of the first level to the first control terminal based on the power supply voltage input at the power supply input terminal and the voltage of the charging / discharging node, and outputs a second control signal of the first level to the second control terminal based on the power supply voltage and the scan signal. The switching circuit responds to the first control signal of the first level, controls the power supply input terminal and the power supply output terminal to be connected, responds to the output voltage output through the power supply output terminal, controls the charging / discharging node to be disconnected from the pull-down terminal, and responds to the output voltage and the second control signal of the first level, controls the charging / discharging node to be connected to the pull-down terminal, so that the charging / discharging node is discharged.

[0159] Step 1002: When the scan signal is abnormal, the control circuit outputs a second control signal of the second level to the second control terminal based on the power supply voltage and the scan signal; the switching circuit responds to the output voltage and the second control signal of the second level, controls the charging / discharging node to disconnect from the pull-down terminal, so that the charging / discharging node is charged; when the charging / discharging node is charged to a level greater than the power supply voltage, the control circuit outputs a first control signal of the second level to the first control terminal based on the power supply voltage and the voltage of the charging / discharging node; the control circuit responds to the first control signal of the second level, controls the power input terminal to disconnect from the power output terminal, and responds to the output voltage, controls the charging / discharging node to connect to the pull-down terminal, so that the charging / discharging node is discharged again; when the charging / discharging node is discharged to a level less than the power supply voltage, the control circuit outputs a first control signal of the first level to the first control terminal based on the power supply voltage and the level of the charging / discharging node.

[0160] It is understood that since the automatic restart method has essentially the same implementation method and technical effect as the aforementioned automatic restart circuit, for the sake of brevity, the implementation method and technical effect of the automatic restart method will not be described again here.

[0161] This application also provides a display module. For example... Figures 1 to 4 As shown, the display module includes: a display panel (i.e., a panel), a scanning circuit (…). Figure 11 (not shown), power management circuitry (i.e., PMIC), and such Figure 11 Any of the automatic restart circuits shown (i.e., Auto Reset circuits).

[0162] The automatic restart circuit is connected to the scan output terminal Gout of the scan circuit and the power management circuit, and is also connected to the power input terminal Vin; the scan output terminal Gout of the scan circuit is also connected to the pixels in the display panel. ​ (Not shown) Connections; the power management circuit is also connected to the display panel.

[0163] The scanning circuit is used to output scanning signals to the pixels in the display panel via the scanning output terminal Gout.

[0164] The automatic restart circuit is used to control the on / off state of the power input terminal Vin and the power management circuit based on the scan signal.

[0165] The power management circuit is used to power the display panel based on the power supply voltage provided at the power input terminal Vin.

[0166] In other words, based on the foregoing description, in this embodiment, the PMIC can be indirectly connected to the power input terminal Vin via an automatic restart circuit. The automatic restart circuit can monitor whether the display panel is faulty based on the scan signal output by the scan output terminal Gout of the scan circuit. When the display panel is not faulty, it can control the power input terminal Vin to conduct with the PMIC, allowing the PMIC to supply power to the display panel based on the power voltage provided by the power input terminal Vin to start the display panel. Conversely, when the display panel is faulty, it can control the power input terminal Vin to disconnect from the PMIC, causing the PMIC to stop supplying power to the display panel and shut it down. However, in some embodiments, the PMIC is generally directly connected to the power input terminal Vin and supplies power to the display panel based on the power voltage provided by the power input terminal Vin to start the display panel. This results in the inability to monitor whether the display panel is faulty and the inability to control the display panel to restart when a fault occurs.

[0167] Optionally, combined ​ As described above, the PMIC can connect to the ICs on the TCON and COF to supply power to them, enabling the ICs on the TCON and COF to control the display panel's image display. Furthermore, the PMIC, TCON, and the Auto Reset circuit described in this embodiment can all be integrated onto the same PCB. The scanning circuit (e.g., GOA circuit) can be placed on the display panel to facilitate narrow bezel design. Of course, the placement here is merely illustrative.

[0168] It is understandable that, since the display module has essentially the same technical effect as the aforementioned automatic restart circuit, for the sake of brevity, the technical effect of the display module will not be described again here.

[0169] Optionally, the display module according to the embodiments of the present application can be an OLED display device. The display device can be any appropriate display device, including but not limited to a screen in the field of vehicle-mounted, a screen in the field of aviation, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, an electronic book, and any product or component having a display function.

[0170] It should be noted that the terms used in the embodiments of the present application are only used to explain the embodiments of the present application, and are not intended to limit the present application. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by those skilled in the art in the field of the present application.

[0171] As used in the present patent application specification and claims, the terms "first", "second", "third", and the like, do not denote any order, quantity, or importance, but are only used to distinguish different components. Similarly, the terms "one" or "a" or the like do not denote a quantity limitation, but denote the existence of at least one. The terms "include" or "contain" or the like mean that the elements or objects appearing before "include" or "contain" cover the elements or objects listed after "include" or "contain" and their equivalents, and do not exclude other elements or objects. The terms "connected" or "connected" or the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly. The character " / " generally represents a "or" relationship between the associated objects before and after.

[0172] The above is only an optional embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An automatic restart circuit for a display panel, characterized in that, The automatic restart circuit includes: The control circuit is connected to the power input terminal, the charging / discharging node, the scanning output terminal, the first control terminal, and the second control terminal, respectively, and is used to output a first control signal to the first control terminal based on the power supply voltage input at the power input terminal and the voltage of the charging / discharging node, and to output a second control signal to the second control terminal based on the power supply voltage and the scanning signal output at the scanning output terminal. A switching circuit includes: a first switching sub-circuit, a second switching sub-circuit, and a third switching sub-circuit; the first switching sub-circuit is connected to the first control terminal, the power input terminal, and the power output terminal respectively, and is used to control the on / off state of the power input terminal and the power output terminal in response to the first control signal; the second switching sub-circuit is connected to the power output terminal, the charging / discharging node, the pull-down terminal, and the adapter node respectively, and is used to control the on / off state of the charging / discharging node and the pull-down terminal in response to the output voltage output through the power output terminal, and to control the on / off state of the charging / discharging node and the adapter node; the third switching sub-circuit is connected to the second control terminal, the adapter node, and the pull-down terminal respectively, and is used to control the on / off state of the adapter node and the pull-down terminal in response to the second control signal, so as to control the on / off state of the charging / discharging node through the third switching sub-circuit and the pull-down terminal; The power output terminal is used to connect to the power management circuit; and when the charging / discharging node is disconnected from the pull-down terminal, the charging / discharging node is charged, and when the charging / discharging node is connected to the pull-down terminal, the charging / discharging node is discharged.

2. The automatic restart circuit according to claim 1, characterized in that, The control circuit includes: The first control sub-circuit is connected to the power input terminal, the charging / discharging node and the first control terminal respectively, and is used to generate a first reference voltage based on the power supply voltage, compare the first reference voltage with the voltage of the charging / discharging node, and output the first control signal to the first control terminal. The second control sub-circuit is connected to the power input terminal, the scan output terminal and the second control terminal respectively, and is used to generate a second reference voltage based on the power supply voltage, generate a status indication voltage based on the scan signal, compare the second reference voltage and the status indication voltage, and output the second control signal to the second control terminal.

3. The automatic restart circuit according to claim 2, characterized in that, The first control sub-circuit includes: The first voltage divider unit is connected to the power input terminal and the first input node respectively, and is used to divide the power supply voltage to generate the first reference voltage and output it to the first input node; The first comparison unit is connected to the first input node, the charging / discharging node, and the first control terminal, respectively, and is used to compare the first reference voltage and the voltage of the charging / discharging node to output the first control signal to the first control terminal.

4. The automatic restart circuit according to claim 3, characterized in that, The first voltage divider unit includes: a first resistor and a second resistor; the first comparison unit includes: a first comparator; The first resistor and the second resistor are connected in series between the power input terminal and the pull-down terminal, and the series connection node of the first resistor and the second resistor is connected to the first input node; The positive input terminal of the first comparator is connected to the first input node, the negative input terminal of the first comparator is connected to the charge / discharge node, and the output terminal of the first comparator is connected to the first control terminal.

5. The automatic restart circuit according to claim 2, characterized in that, The second control sub-circuit includes: The second voltage divider unit is connected to the power input terminal and the second input node respectively, and is used to divide the power supply voltage to generate the second reference voltage and output it to the second input node; A voltage control unit is connected to the scan output terminal and the third input node respectively, and is used to generate the status indication voltage based on the scan signal and output it to the third input node; The second comparison unit is connected to the second input node, the third input node and the second control terminal respectively, and is used to compare the second reference voltage and the status indication voltage to output the second control signal to the second control terminal.

6. The automatic restart circuit according to claim 5, characterized in that, The second voltage divider unit includes a third resistor and a fourth resistor; the voltage control unit includes a fifth resistor and a first capacitor; the second comparison unit includes a second comparator. The third resistor and the fourth resistor are connected in series between the power input terminal and the pull-down terminal, and the series connection node of the third resistor and the fourth resistor is connected to the second input node; The fifth resistor is connected between the third input node and the pull-down terminal, and the first capacitor is connected between the scan output terminal and the third input node; The positive input terminal of the second comparator is connected to the third input node, the negative input terminal of the second comparator is connected to the second input node, and the output terminal of the second comparator is connected to the second control terminal.

7. The automatic restart circuit according to any one of claims 1 to 6, characterized in that, The first switch sub-circuit includes: a single-contact relay; The coil in the single-contact relay is connected between the first control terminal and the pull-down terminal. The common contact in the single-contact relay is connected to the power input terminal, and the normally open contact in the single-contact relay is used to connect to the power output terminal.

8. The automatic restart circuit according to any one of claims 1 to 6, characterized in that, The second switch sub-circuit includes: a two-contact relay; The coil in the dual-contact relay is connected between the power output terminal and the pull-down terminal. The common contact in the dual-contact relay is connected to the charging / discharging node. The normally closed contact in the dual-contact relay is used to connect to the pull-down terminal. The normally open contact in the dual-contact relay is used to connect to the transfer node.

9. The automatic restart circuit according to claim 8, characterized in that, The automatic restart circuit further includes a sixth resistor connected between the normally closed contact and the pull-down terminal.

10. The automatic restart circuit according to any one of claims 1 to 6, characterized in that, The third switching sub-circuit includes: an optocoupler; The emitter in the optocoupler is connected between the second control terminal and the pull-down terminal, and the receiver in the optocoupler is connected between the adapter node and the pull-down terminal.

11. The automatic restart circuit according to any one of claims 1 to 6, characterized in that, The automatic restart circuit also includes: The charging circuit is connected to the power input terminal and the charging / discharging node respectively, and is used to charge the charging / discharging node based on the power supply voltage.

12. The automatic restart circuit according to claim 11, characterized in that, The charging circuit includes: a seventh resistor and a second capacitor; The seventh resistor is connected between the power input terminal and the charging / discharging node, and the second capacitor is connected between the charging / discharging node and the pull-down terminal.

13. An automatic restart method for a display panel, characterized in that, The method, applied in the automatic restart circuit of the display panel as described in any one of claims 1 to 12, comprises: When the scan signal output from the scan output terminal is normal, the control circuit outputs a first control signal of the first level to the first control terminal based on the power supply voltage input from the power supply input terminal and the voltage of the charging / discharging node, and outputs a second control signal of the first level to the second control terminal based on the power supply voltage and the scan signal; in the switching circuit, the first switching circuit responds to the first control signal of the first level and controls the power supply input terminal to be connected to the power supply output terminal, the second switching circuit responds to the output voltage output through the power supply output terminal and controls the charging / discharging node to be disconnected from the pull-down terminal, and controls the charging / discharging node to be connected to the transition node, and the third switching circuit responds to the second control signal of the first level and controls the transition node to be connected to the pull-down terminal, so as to control the charging / discharging node to be indirectly connected to the pull-down terminal through the third switching circuit, so that the charging / discharging node is discharged; When the scan signal is abnormal, the control circuit outputs a second control signal of a second level to the second control terminal based on the power supply voltage and the scan signal; the third switching circuit responds to the second control signal of the second level and controls the connection between the adapter node and the pull-down terminal to charge the charging / discharging node; when the charging / discharging node is charged to a level greater than the power supply voltage, the control circuit outputs a first control signal of a second level to the first control terminal based on the power supply voltage and the voltage of the charging / discharging node; the first switching circuit responds to the first control signal of the second level and controls the connection between the power input terminal and the power output terminal to disconnect; the second switching circuit responds to the output voltage and controls the charging / discharging node to be directly connected to the pull-down terminal to discharge the charging / discharging node again; when the charging / discharging node is discharged to a level less than the power supply voltage, the control circuit outputs a first control signal of a first level to the first control terminal based on the power supply voltage and the voltage of the charging / discharging node.

14. A display module, characterized in that, The display module includes: a display panel, a scanning circuit, a power management circuit, and an automatic restart circuit for the display panel as described in any one of claims 1 to 12; The automatic restart circuit is connected to the scan output terminal of the scanning circuit and the power management circuit, and is also connected to the power input terminal; the scan output terminal of the scanning circuit is also connected to the pixels in the display panel; the power management circuit is also connected to the display panel. The scanning circuit is used to output scanning signals to the pixels in the display panel via the scanning output terminal; The automatic restart circuit is used to: control the connection and disconnection between the power input terminal and the power management circuit based on the scanning signal; The power management circuit is used to: supply power to the display panel based on the power voltage provided by the power input terminal.

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