Automatic restart circuit and method of display panel and display module

Abstract

The invention provides an automatic restart circuit and method of a display panel and a display module, and belongs to the technical field of display. In the automatic restart circuit, the control circuit and the switching circuit can be matched with each other so as to control the charging and discharging node to be charged or discharged based on the scanning signal reflecting whether the display panel fails or not, and control the on-off of the power input end and the power management circuit based on the voltage of the charging and discharging node, so that when the display panel fails, the display panel can be automatically restarted. When the display panel is normal, the power input end is controlled to be disconnected with the power management circuit, so that the power management circuit stops supplying power to the display panel to control the display panel to be shut down, and when the display panel returns to normal, the power input end is controlled to be connected with the power management circuit. And the power management circuit supplies power to the display panel again to control the display panel to be started, so that one-time automatic restart of the display panel is completed.

Description

Technical Field

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

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

[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. Among them, the power management circuit can supply power to the display panel based on the power supply voltage provided by the power input terminal to start the display panel. The scanning circuit can output a scanning signal to the pixels in the display panel after the display panel is started to drive the pixels to emit light. In this way, the display panel can display the picture.

[0004] However, due to various factors (such as display screen failure), the display panel may not display normally at some time. At this time, a circuit capable of automatically restarting the display panel is urgently needed so that the display panel can be quickly restarted to display normally. Summary of the invention

[0005] Provided are an automatic restart circuit and method for a display panel, and a display module, 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, the automatic restart circuit comprising:

[0007] a control circuit, connected to the power input terminal, the charge-discharge node, the scan output terminal, the first control terminal and the second control terminal respectively, and used to output a first control signal to the first control terminal based on the power voltage input to the power input terminal and the voltage of the charge-discharge node, and output a second control signal to the second control terminal based on the power voltage and the scan signal output from the scan output terminal;

[0008] a switch circuit, connected to the power input terminal, the power output terminal, the second control terminal, the charge-discharge node and the pull-down terminal respectively, and used to control the on-off of the power input terminal and the power output terminal in response to the first control signal, control the on-off of the charge-discharge node and the pull-down terminal in response to the output voltage outputted through the power output terminal, and control the on-off of the charge-discharge node and the pull-down terminal in response to the output voltage and the second control signal;

[0009] Wherein, the power output end is used to connect to the power management circuit; and when the charge and discharge node is disconnected from the pull-down end, the charge and discharge node is charged, and when the charge and discharge node is connected to the pull-down end, the charge and discharge node is discharged.

[0010] Optionally, the control circuit includes:

[0011] a first control subcircuit connected to the power input terminal, the charge and discharge node and the first control terminal respectively, and configured to generate a first reference voltage based on the power voltage, compare the first reference voltage with the voltage of the charge and discharge node, and output the first control signal to the first control terminal;

[0012] The second control subcircuit is respectively connected to the power input terminal, the scan output terminal and the second control terminal, and is used to generate a second reference voltage based on the power supply voltage, generate a state indication voltage based on the scan signal, compare the second reference voltage and the state indication voltage, and output the second control signal to the second control terminal.

[0013] Optionally, the first control subcircuit includes:

[0014] a first voltage dividing unit, connected to the power input terminal and the first input node respectively, and used for dividing the power voltage to generate the first reference voltage, and outputting the first reference voltage to the first input node;

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

[0016] Optionally, the first voltage dividing unit includes: a first resistor and a second resistor; the first comparing unit includes: a first comparator;

[0017] The first resistor and the second resistor are connected in series between the power input terminal and the pull-down terminal, and a series node of the first resistor and the second resistor is connected to the first input node;

[0018] The positive phase input terminal of the first comparator is connected to the first input node, the negative phase input terminal of the first comparator is connected to the charge and discharge node, and the output terminal of the first comparator is connected to the first control terminal.

[0019] Optionally, the second control subcircuit includes:

[0020] A second voltage dividing unit, connected to the second input node of the power input terminal respectively, and used for dividing the power voltage to generate the second reference voltage, and outputting the second reference voltage to the second input node;

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

[0022] 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 state indication voltage to output the second control signal to the second control terminal.

[0023] Optionally, the second voltage dividing unit includes: a third resistor and a fourth resistor; the voltage control unit includes: a fifth resistor and a first capacitor; the second comparing unit includes: a second comparator;

[0024] The third resistor and the fourth resistor are connected in series between the power input terminal and the pull-down terminal, and a series node of the third resistor and the fourth resistor is connected to the second input node;

[0025] 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;

[0026] The non-inverting 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.

[0027] Optionally, the switch circuit includes:

[0028] a first switch subcircuit, connected to the first control terminal, the power input terminal and the power output terminal respectively, and used for controlling the on / off of the power input terminal and the power output terminal in response to the first control signal;

[0029] A second switch subcircuit is connected to the power output terminal, the charge and discharge node, the pull-down terminal and the transfer node respectively, and is used to control the connection and disconnection of the charge and discharge node and the pull-down terminal, and control the connection and disconnection of the charge and discharge node and the transfer node in response to the output voltage;

[0030] The third switch sub-circuit is connected to the second control terminal, the transfer node and the pull-down terminal respectively, and is used to control the connection and disconnection of the transfer node and the pull-down terminal in response to the second control signal.

[0031] Optionally, the first switch subcircuit includes: a single-contact relay;

[0032] 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.

[0033] Optionally, the second switch subcircuit includes: a double-contact relay;

[0034] The coil in the double-contact relay is connected between the power output end and the pull-down end, the common contact in the double-contact relay is connected to the charging and discharging node, the normally closed contact in the double-contact electrical appliance is used to connect to the pull-down end, and the normally open contact in the double-contact relay is used to connect to the transfer node.

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

[0036] Optionally, the third switch subcircuit includes: a photoelectric coupler;

[0037] The light emitter in the photoelectric coupler is connected between the second control end and the pull-down end, and the light receiver in the photoelectric coupler is connected between the transfer node and the pull-down end.

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

[0039] The charging circuit is connected to the power input terminal and the charging and discharging node respectively, and is used to charge the charging and discharging node based on the power supply 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 and discharge node, and the second capacitor is connected between the charge and discharge node and the pull-down terminal.

[0042] On the other hand, a method for automatically restarting 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 includes:

[0043] When the scan signal outputted 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 the power supply voltage inputted from the power supply input terminal and the voltage of the charge-discharge node, and outputs a second control signal of a first level to the second control terminal based on the power supply voltage and the scan signal, the switch circuit controls the power supply input terminal to be connected with the power supply output terminal in response to the first control signal of the first level, controls the charge-discharge node to be disconnected from the pull-down terminal in response to the output voltage outputted from the power supply output terminal, and controls the charge-discharge node to be connected with the pull-down terminal 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 and discharge node to be disconnected from the pull-down terminal in response to the output voltage and the second control signal of the second level, so that the charge and discharge node is charged; when the charge and discharge 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 charge and discharge node; the control circuit controls the power supply input terminal to be disconnected from the power supply output terminal in response to the first control signal of the second level, and controls the charge and discharge node to be turned on with the pull-down terminal in response to the output voltage, so that the charge and discharge node is discharged again; when the charge and discharge node is discharged to a level less than the power supply voltage, the control circuit sends a first control signal of a first level to the first control terminal based on the power supply voltage and the level of the charge and discharge node.

[0045] In another aspect, a display module is provided, the display module comprising: a display panel, a scanning 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 to the scan output terminal of the scan circuit and the power management circuit respectively, and is also connected to the power input terminal; the scan output terminal of the scan circuit is also connected to the pixel in the display panel; the power management circuit is also connected to the display panel;

[0047] The scanning circuit is used to: output a scanning signal to the pixels in the display panel via the scanning output terminal;

[0048] The automatic restart circuit is used to: control the on-off of the power input terminal and the power management circuit based on the scanning signal;

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

[0050] In summary, the beneficial effects brought about by the technical solution provided by the embodiments of the present application may at least include:

[0051] Provided are an automatic restart circuit and method for a display panel, and a display module. In the automatic restart circuit, a control circuit and a switch circuit can cooperate with each other to control the charging or discharging of a charge-discharge node based on a scanning signal reflecting whether the display panel is faulty, and control the on-off of a power input terminal and a power management circuit based on the voltage of the charge-discharge node. Therefore, when the display panel fails, the power input terminal can be disconnected from the power management circuit by controlling the power input terminal to stop supplying power to the display panel and control the display panel to shut down. When the display panel returns to normal, the power input terminal can be connected to the power management circuit by controlling the power management circuit to 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 THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

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

[0055] Figure 3 It is a structural schematic diagram of another automatic restart circuit provided in an embodiment of the present application;

[0056] Figure 4 1 is a schematic diagram of a circuit structure of an automatic restart circuit provided in an embodiment of the present application;

[0057] Figure 5 is Figure 4 A working schematic diagram of an automatic restart circuit provided based on the structure shown;

[0058] Figure 6 is Figure 4 Another working schematic diagram of an automatic restart circuit provided based on the structure shown;

[0059] Figure 7 is Figure 4 A working schematic diagram of another automatic restart circuit provided based on the structure shown;

[0060] Figure 8 is Figure 4 A simulation schematic diagram of an automatic restart circuit provided based on the structure shown;

[0061] Fig. 9 is Figure 4 A simulation schematic diagram of another automatic restart circuit provided based on the structure shown;

[0062] Fig.10 It is a flowchart of an automatic restart method provided in an embodiment of the present application;

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

[0064] In order to make the objectives, technical solutions and advantages of the present application more clear, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0065] 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 also gradually developed from black and white to color, the PPI (pixels per inch, PPI, used to characterize resolution) of display products has continued to increase, the thickness of display products has continued to decrease, and the form of display products has also developed from flat to curved, folded and rolled. The application scenarios of display products have also ranged from mobile phones, watches, medical, industrial control, automotive to aviation, involving various fields. The display control system has also changed from controlling the display of one screen (panel) to controlling the display of multiple screens, and even in the aircraft system in the aviation field, it can control the display of hundreds of screens. For example, each seat on the current large aircraft is equipped with an independent display screen, and the display control system on the aircraft can control the display of the display screen on each seat. However, when a certain display screen fails (eg, freezes) and cannot display normally, the system cannot automatically restart the single screen, and the screen cannot restore normal display.

[0066] Based on this, strict requirements are placed on the reliability of the screen, but since it cannot be automatically restarted, problems with the screen cannot be avoided. In response to this problem, an embodiment of the present application provides an automatic restart circuit, which can automatically restart the display panel in time when the display panel (that is, the display screen or screen) fails, to ensure that the display panel can return to normal. The automatic restart circuit can be applied to various fields, especially to aviation or automotive fields with multiple screens. The automatic restart circuit can not only 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 improve the display security, so that the display screen can still restart and return to normal after a freeze.

[0067] Optionally, the embodiment of the present application takes OLED display technology as an example. OLED is also called organic electric laser display or organic light-emitting semiconductor. OLED can cause luminescence through the injection and recombination of carriers, and the luminous intensity is proportional to the injected current. Under the action of the electric field, the holes generated by the anode and the electrons generated by the cathode of the OLED will move, inject 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 the light-emitting molecules to finally produce visible light.

[0068] Figure 1 Schematic diagram of the structure of an automatic restart circuit of a display panel provided in an embodiment of the present application. Figure 1 As shown, the automatic restart circuit 00 includes: a control circuit 01 and a switch circuit 02 .

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

[0070] It is understood that the power supply 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 power supply control of the power management circuit and the drive of the scan signal, the pixels in the display panel can emit light, and the display panel can start and display the picture.

[0071] Among them, the power management circuit is also a power management integrated circuit (PMIC). The power supply voltage can be about 3.3V, and can be provided to the power output terminal Vin by the customer, where the customer can refer to the client. For example, when the display panel is used in the vehicle field, the client can refer to the vehicle system. Of course, the 3.3V here is only a schematic illustration, and the power supply voltage in different scenarios may be different. The PMIC can be connected to the drive circuit that drives the display panel to start, and is used to supply power to the drive circuit based on the power supply voltage, so that the drive circuit drives the display panel to display. The drive circuit may, for example, include a timing controller (TCON) and an IC integrated on a COF, where COF refers to a technology in which a chip is packaged on a film (chip on film). The drive circuit and PMIC are generally arranged on a printed circuit board (PCB) and are bound and connected to the display panel through the COF.

[0072] In addition to the above-mentioned drive circuit, Figure 1 It can be seen that the display module may also include a scanning circuit, and the scanning output terminal Gout may refer to the output terminal of the scanning circuit. The output terminal of the scanning circuit is generally connected to the pixel on the display panel and is used to output a scanning signal to the pixel via the scanning output terminal Gout to drive the pixel to emit light. For example, the scanning circuit may be a gate drive circuit, and the scanning signal may be, for example, a gate scanning signal. In addition, considering the narrow frame design, the scanning circuit is usually integrated on the display panel using the gate driver on array technology, so it may also be called a GOA circuit or GOA.

[0073] Among them, GOA usually includes a plurality of cascaded GOA units, and the scan output terminals Gout of the plurality of GOA units can be connected to a plurality of rows of pixels in the display panel to output scan signals to the plurality of rows of pixels. When the display panel fails to display normally, the scan signal outputted 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 does not fail, the scan signal outputted through the scan output terminal Gout is normal, such as a sine wave signal. Based on this, the embodiment of the present application can be used to indicate whether the display panel fails by setting the control circuit 01 to output a second control signal based on the scan signal, so as to prompt whether to automatically restart the display panel.

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

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

[0076] Of course, the above comparison method is only for schematic illustration. For example, in some other embodiments, taking the output of the first control signal as an example, the control circuit 01 can also output the first control signal of the first level when the voltage of the charge-discharge node N01 is greater than the power supply voltage; and output the first control signal of the second level when the voltage of the charge-discharge node N01 is less than the power supply voltage. It can be understood that the power supply voltage compared here can refer to the reference voltage obtained based on the power supply voltage division rather than the power supply voltage itself, and the scan signal compared can refer to the voltage determined based on the scan signal rather than the scan signal itself.

[0077] Optionally, the first level may refer to an effective level, which is used to control the switch to be turned on or closed; the second level may refer to an invalid level, which is used to control the switch to be turned off or disconnected. Thus, the control signal of the first level (such as the first control signal or the second control signal) may refer to an on control signal, and the control signal of the second level may refer to an off control signal. Moreover, the first level may be a high level relative to the second level. That is, the first level may be a high level 1, and the second level may be a low level 0. Of course, in some other embodiments, the first level may also be a low level relative to the second level.

[0078] The switch circuit 02 is connected to the power input terminal Vin, the power output terminal Vout, the first control terminal O1, the second control terminal O2, the charge-discharge node N01 and the pull-down terminal V0 respectively. The switch circuit 02 is used 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, control the connection and disconnection of the charge-discharge node N01 and the pull-down terminal V0 in response to the output voltage output through the power output terminal Vout, and control the connection and disconnection of 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 connect to the power management circuit PMIC. Figure 1 As shown, in the embodiment of the present application, the PMIC is not directly connected to the power input terminal Vin, but is indirectly connected to 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 turned on, the power voltage can be transmitted to the PMIC again, so that the PMIC supplies power to the display panel based on the power voltage. When the switch circuit 02 controls the power input terminal Vin and the power output terminal Vout to be disconnected, the power voltage will not be transmitted to the PMIC. At this time, the PMIC can stop supplying power to the display panel to shut down the display panel. In this way, by controlling the on and off of the power input terminal Vin and the power output terminal Vout by the switch circuit 02, the PMIC can be triggered to complete the automatic restart of the display panel.

[0080] Furthermore, when the charge-discharge node N01 is disconnected from the pull-down terminal V0, the charge-discharge node N01 is charged; when the charge-discharge node N01 is connected to the pull-down terminal V0, the charge-discharge node N01 is discharged. That is, when the charge-discharge node N01 is connected to the pull-down terminal V0, the voltage on the charge-discharge node N01 can be released to the pull-down terminal V0, thereby completing the discharge.

[0081] Optionally, the pull-down terminal V0 may be, for example, Figure 1 The ground terminal GND shown, accordingly, the voltage on the charge and discharge node N01 can be released to the ground. Alternatively, the pull-down power supply terminal V0 can also be any terminal that can control the voltage on the charge and discharge node N01 to be released, such as the pull-down power supply terminal VSS. The embodiment of the present application is described by taking the pull-down terminal V0 as the ground terminal GND as an example. And, it can be understood that the voltage of the signal provided by the pull-down terminal V0 is less than the power supply voltage provided by the power input terminal Vin. Generally, the power supply 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.

[0082] For example, the switch circuit 02 can control the power input terminal Vin and the power output terminal Vout to be turned on when the level of the first control signal is the 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 by the power output terminal Vout can be the power voltage, and then, the PMIC can power the display panel based on the power voltage to further start the display panel. And, 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 the second level. At this time, the power voltage can no longer be transmitted to the power output terminal Vout, and then, the PMIC can no longer power the display panel, and the display panel is shut down.

[0083] Similarly, the switch circuit 02 can control the charge-discharge node N01 to be disconnected from the pull-down terminal V0 in response to the output voltage when the output voltage outputted 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. Also, the switch circuit 02 can control the charge-discharge 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 charge-discharge node N01 can be released to the pull-down terminal V0, and the voltage on the charge-discharge node N01 can be discharged. That is, when the power voltage is not outputted through the power output terminal Vout, the switch circuit 02 can control the charge-discharge node N01 to be connected to the pull-down terminal V0 by default; when the power voltage is outputted through the power output terminal Vout, the switch circuit 02 can only control the charge-discharge node N01 to be disconnected from the pull-down terminal V0 in response to the output voltage.

[0084] In addition, the switch circuit 02 can also control the charge-discharge node N01 to be connected with the pull-down terminal V0 in response to the output voltage and the second control signal of the first level 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, so that the voltage on the charge-discharge node N01 can be released to the pull-down terminal V0, and the voltage on the charge-discharge node N01 is discharged. And, the switch circuit 02 can also control the charge-discharge node N01 to be disconnected from the pull-down terminal V0 in response to the output voltage and the second control signal of the second level 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, so that the charge-discharge node N01 is charged. 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 charge-discharge 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 charge-discharge node N01 is charged or discharged.

[0085] Combined with the above description, when the voltage of the charge-discharge node N01 is charged to a voltage greater than the reference voltage generated based on the power supply voltage, the control circuit 01 can output a first control signal of a second level to the first control terminal O1, so that the power input terminal Vin is disconnected from the power output terminal Vout, thereby shutting down the display panel; and when the voltage of the charge-discharge node N01 is less than the reference voltage generated based on the power supply voltage, the control circuit 01 can output a first control signal of a first level to the first control terminal O1, so that the power input terminal Vin is connected to the power output terminal Vout, so that the display panel is turned on. In this way, the automatic restart of the display panel is achieved.

[0086] It can be understood that since the second control signal is a signal output by the control circuit 01 based on the scanning signal, and the scanning signal can indicate whether the display panel is faulty, the control circuit 01 can output a second control signal of a corresponding level based on the current condition of the display panel (i.e., faulty or normal), so as to control the switch circuit 02 to control the on / off of the charge and discharge node N01 and the pull-down terminal V0, charge or discharge the charge and discharge node N01, and thereby realize automatic restart of the display panel.

[0087] For example, in combination with the above description, when the display panel fails, the voltage determined based on the scan signal can be less than the reference voltage determined based on the power supply voltage, and the control circuit 01 can output the second control signal of the second level, so that the switch circuit 02 controls the charge-discharge node N01 to be disconnected from the pull-down terminal V0, thereby charging the charge-discharge node N01, and then the control circuit 01 can output the first control signal of the second level, so that the power input terminal Vin is disconnected from the power output terminal Vout, and the display panel automatically shuts down. When the display panel is working normally, that is, when there is no failure, the voltage determined based on the scan signal can be greater than the reference voltage determined based on the power supply voltage, and the control circuit 01 can output the second control signal of the first level, so that the switch circuit 02 controls the charge-discharge node N01 to be connected to the pull-down terminal V0, thereby discharging the charge-discharge node N01, and then the control circuit 01 can output the first control signal of the first level, so that the power input terminal Vin is connected to the power output terminal Vout, and the display panel automatically turns on.

[0088] That is, based on the above example, the voltage determined based on the scan signal is greater than the reference voltage determined based on the power supply voltage, which can be used to indicate that the display panel is normal. At this time, the voltage of the charge and discharge node can be made less than the reference voltage determined based on the power supply voltage, so that the control circuit 01 and the switch circuit 02 can be coordinated to control the power input terminal Vin and the power output terminal Vout to be turned on, and the display panel starts displaying normally. The voltage determined based on the scan signal is less than the reference voltage determined based on the power supply voltage, which can be used to indicate a display panel failure. At this time, the voltage at the charge and discharge node can be made greater than the reference voltage determined based on the power supply voltage, so that the control circuit 01 and the switch circuit 02 can be coordinated to control the power input terminal Vin and the power output terminal Vout to be disconnected, and the display panel shuts down and stops displaying. Of course, if the comparison method changes, the control method here will also change flexibly.

[0089] 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 charging or discharging of the charge and discharge nodes based on the scanning signal reflecting whether the display panel is faulty, and control the on-off of the power input terminal and the power management circuit based on the voltage of the charge and discharge node. Therefore, when the display panel fails, the power input terminal can be disconnected from the power management circuit by controlling the power input terminal to stop supplying power to the display panel and control the display panel to shut down. When the display panel returns to normal, the power input terminal can be connected to the power management circuit by controlling the power management circuit to supply power to the display panel again and control the display panel to start up, thereby completing an automatic restart of the display panel.

[0090] Optionally, Figure 2 is a schematic diagram of another automatic restart circuit provided in an embodiment of the present application. Figure 2 As shown, the control circuit 01 may include: a first control subcircuit 011 and a second control subcircuit 012 .

[0091] The first control subcircuit 011 can be connected to the power input terminal Vin, the charge-discharge node N01 and the first control terminal O1 respectively. In addition, the first control subcircuit 011 can be used to generate a first reference voltage based on the power voltage, compare the first reference voltage with the voltage of the charge-discharge node N01, and output a first control signal to the first control terminal O1.

[0092] For example, the first control subcircuit 011 may divide the power supply voltage to generate a first reference voltage. Then, the first control subcircuit 011 may output a first control signal of a first level to the first control terminal O1 when the first reference voltage is greater than the voltage of the charge-discharge node N01; the first control subcircuit 011 may output a first control signal of a second level to the first control terminal O1 when the first reference voltage is less than the voltage of the charge-discharge node N01.

[0093] The second control subcircuit 012 can be connected to the power input terminal Vin, the scan output terminal Gout and the second control terminal O2 respectively. In addition, the second control subcircuit 012 can be used 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 terminal O2.

[0094] For example, the second control subcircuit 012 may also divide the power supply voltage to generate a second reference voltage, and may generate a state indication voltage based on the scanning circuit. Then, the second control subcircuit 012 may output a second control signal of a first level to the second control terminal O2 when the second reference voltage is less than the state indication voltage; the second control subcircuit 012 may output a second control signal of a second level to the second control terminal O2 when the second reference voltage is greater than the state indication voltage. In combination with the foregoing description, the state indication voltage obtained based on the scanning signal may be used to indicate whether the display panel is faulty, so as to further indicate whether the display panel needs to be automatically restarted.

[0095] That is, the two control sub-circuits may output the first control signal and the second control signal to the first control terminal O1 and the second output terminal O2 respectively.

[0096] Optionally, Figure 3 is a schematic diagram of another automatic restart circuit provided in an embodiment of the present application. Figure 3 As shown, the first control subcircuit 011 may include: a first voltage dividing unit 0111 and a first comparing unit 0112 .

[0097] The first voltage dividing unit 0111 may be connected to the power input terminal Vin and the first input node N1 respectively. In addition, the first voltage dividing unit 0111 may be used to divide the power voltage to obtain a first reference voltage and output the first reference voltage to the first input node N1.

[0098] That is, as described above, the first control subcircuit 011 can divide the power supply voltage through the first voltage dividing unit 0111 therein to generate the first reference voltage.

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

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

[0101] Optionally, continue to refer to Figure 3 It can be seen that the second control subcircuit 012 may include: a second voltage dividing unit 0121 , a voltage control unit 0122 and a second comparing unit 0123 .

[0102] The second voltage dividing unit 0121 can be connected to the power input terminal Vin and the second input node N2 respectively. In addition, the second voltage dividing unit 0121 can be used to divide the power voltage to generate a second reference voltage and output it to the second input node N2.

[0103] That is, as described above, the second control subcircuit 012 can divide the power supply voltage through the second voltage dividing unit 0121 therein to obtain the second reference voltage.

[0104] The voltage control unit 0122 may be connected to the scan output terminal Gout and the third input node N3 respectively. In addition, the voltage control unit 0122 may be used to generate a state indication voltage based on the scan signal and output the state indication voltage to the third input node N3.

[0105] That is, as described above, the second control subcircuit 012 can obtain the state indication voltage based on the scan signal through the voltage control unit 0122 therein. For example, the voltage control unit 0122 can control the voltage of the third input node N3 based on the scan signal to output the state indication voltage to the third node N3.

[0106] The second comparison unit 0123 may be connected to the second input node N2, the third input node N3 and the second control terminal O2 respectively. Also, the second comparison unit 0123 may be used to compare the second reference voltage and the state indication voltage to output a second control signal to the second control terminal O2.

[0107] That is, as described above, the second control subcircuit 012 can compare the second reference voltage and the state indication voltage through the second comparison unit 0123 therein, so as to output a second control signal based on the comparison result.

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

[0109] The first switch subcircuit 021 can be connected to the first control terminal O1, the power input terminal Vin and the power output terminal Vout respectively. In addition, the first switch subcircuit 021 can be used to control the on / off of the power input terminal Vin and the power output terminal Vout in response to a 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 subcircuit 022 can be connected to the power output terminal Vout, the charge and discharge node N01, the pull-down terminal V0 and the transfer node N02 respectively. In addition, the second switch subcircuit 022 can be used to control the connection and disconnection of the charge and discharge node N01 and the pull-down terminal V0, and control the connection and disconnection of the charge and discharge node N01 and the transfer node N02 in response to the output voltage.

[0112] For example, the second switch subcircuit 022 can control the charge-discharge node N01 to be disconnected from the pull-down terminal V0 when the level of the output voltage is the first level, and control the charge-discharge node N01 to be connected to the transfer node N02; the second switch subcircuit 022 can control the charge-discharge node N01 to be connected to the pull-down terminal V0 when the level of the output voltage is the second level, and control the charge-discharge node N01 to be disconnected from the transfer node N02. Wherein, the output voltage is the power supply voltage transmitted through the power input terminal Vin. Moreover, when the power input terminal Vin is connected to the power output terminal Vout, the output voltage is the power supply voltage, and at this time, the level of the output voltage can be considered to be the first level; when the power input terminal Vin is disconnected from the power output terminal Vout, the output voltage is 0, and at this time, the level of the output voltage can be considered to be the second level.

[0113] The third switch sub-circuit 023 can be connected to the second control terminal O2, the transfer node N02 and the pull-down terminal V0 respectively. In addition, the third switch sub-circuit 023 can be used to control the connection and disconnection between the transfer node N02 and the pull-down terminal V0 in response to the second control signal.

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

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

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

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

[0118] Optionally, combined 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 to 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 to the pull-down terminal V0 (eg, the ground terminal GND).

[0119] Optionally, Figure 4 Schematic diagram of the circuit structure of an automatic restart circuit provided in an embodiment of the present application. Figure 4 As shown, the first voltage dividing unit 0111 may include: a first resistor R1 and a second resistor R2. The first comparing unit 0112 may include: a first comparator Comp1.

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

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

[0122] The positive input terminal + of the first comparator Comp1 can be connected to the first input node N1, the negative input terminal − of the first comparator Comp1 can be connected to the charge and discharge node N01, and the output terminal of the first comparator Comp1 can be connected to the first control terminal O1.

[0123] Thus, the above-mentioned record is satisfied, and the first comparison unit 0112 can output a first control signal of a first level (i.e., a 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 a first control signal of a second level (i.e., a 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 positive phase input terminal + and the negative phase input terminal - of the first comparator Comp1 are interchanged, the working principle of the first comparison unit 0112 will also change accordingly. No further details will be given here.

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

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

[0127] It is understandable that if the third resistor R3, the fourth resistor R4, the first resistor R1 and the second resistor R2 have the same resistance value, the first reference voltage and the second reference voltage obtained by voltage division are the same; otherwise, they are different. The embodiment of the present application does not limit the magnitude relationship between the first reference voltage and the second reference voltage.

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

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

[0130] The positive phase input terminal + of the second comparator Comp2 can be connected to the third input node N3, the negative phase 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, the above-mentioned record is satisfied, and the second comparison unit 0123 can output the second control signal of the first level (i.e., high level 1) to the second control terminal 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 the second control signal of the second level (i.e., low level 0) to the second control terminal 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 positive phase input terminal + and the negative phase input terminal - of the second comparator Comp2 are interchanged, the working principle of the first comparison unit 0112 will also change accordingly. No further details will be given here.

[0132] Optionally, refer 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. In addition, each comparator can also be connected to the power input terminal Vin and the pull-down terminal V0 to operate under the voltage difference between the power voltage provided by the power input terminal Vin and the power signal provided by the pull-down terminal V0.

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

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

[0135] That is, the single-contact relay can be a normally open single-contact relay. In this way, when the level of the first control signal provided by the first control terminal O1 is the second level, that is, when the power is off, the normally open contact J1 in the single-contact relay can be disconnected from the power output terminal Vout, and at this time, the single-contact relay can be considered to be disconnected. When the level of the first control signal provided by the first control terminal O1 is the first level, that is, when the power is on, the normally open contact J1 in the single-contact relay can be connected to the power output terminal Vout, and at this time, the single-contact relay can be considered to be closed and turned on.

[0136] Optionally, continue to refer to Figure 4 It can be seen that the second switch sub-circuit 022 may 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 to the charging and discharging node N01, the normally closed contact J2 in the double-contact relay can be used to connect to the pull-down terminal V0, and the normally open contact J3 in the double-contact relay can be used to connect to the transfer node N02.

[0138] In this way, 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, that is, when the power is off, the normally closed contact J2 of the double-contact relay can be connected to the pull-down terminal V0, and the normally open contact J3 of the double-contact relay is disconnected from the transfer node N02. When the power input terminal Vin is connected to the power output terminal Vout and a power voltage is transmitted to the power output terminal Vout, that is, when the power is on, the normally open contact J3 of the double-contact relay can be connected to the transfer 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 the 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 to the pull-down terminal V0; when the 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 to the transfer node N02, and is indirectly connected to the pull-down terminal V0 via the third switch sub-circuit 023. When the third switch sub-circuit 023 controls the transfer node N02 to be conductive with the pull-down terminal V0, the charge-discharge node N01 can be connected to the pull-down terminal V0; and when the third switch sub-circuit 023 controls the transfer node N02 to be disconnected from the pull-down terminal V0, the charge-discharge node N01 can be disconnected from the pull-down terminal V0.

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

[0140] Optionally, continue to refer to Figure 4 It can be seen that the third switch sub-circuit 023 may include: a photocoupler.

[0141] The light emitter LD in the photocoupler may be connected between the second control terminal O2 and the pull-down terminal V0 , and the light receiver (ie, photoelectric receiver) LC in the photocoupler may be connected between the transfer 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 this time, the light can be irradiated onto the light receiver LC. The light receiver LC can generate a photocurrent under the action of the photoelectric effect and lead it out through the output terminal, so that the transfer node N02 is connected to the pull-down terminal V0, and then the charge-discharge node N01 is connected to the pull-down terminal V0. On the basis of controlling the charge-discharge node N01 to be connected to the pull-down terminal V0, the voltage on the charge-discharge node N01 can be released to the pull-down terminal V0, that is, the voltage on the charge-discharge node N01 is continuously reduced 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 this time, the light cannot be irradiated onto the light receiver LC, and the light receiver LC cannot generate a photocurrent. At this time, the transfer node N02 is disconnected from the pull-down terminal V0, and then the charge-discharge node N01 can be disconnected from the pull-down terminal V0. On the basis of controlling the charge-discharge node N01 to be disconnected from the pull-down terminal V0, the charge-discharge node N01 can be charged by the charging circuit 03, so that the voltage on the charge-discharge node N01 continues to rise, so as 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-light-electricity.

[0143] Optionally, the light emitter LD may be, for example, Figure 4 The LED shown, the light receiver LC can be, for example, a photodiode, and the light emitter LD and the light receiver LC can generally be packaged together and used as a photocoupler.

[0144] Optionally, continue to refer to Figure 4 It can be seen that the charging circuit 03 may 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 Figure 4 The RC charging circuit shown.

[0146] certainly, Figure 4 The device selection of each circuit shown is only for schematic illustration, and any device that can achieve the above functions can be applied to the present application, and the present application embodiment does not limit this. For example, in some other embodiments, any sub-circuit in the first switch sub-circuit 021 to the third switch sub-circuit 023 can also be a switch composed of transistors.

[0147] For example, Figure 4Taking the structure shown in the figure, the first level is a high level 1, the second level is a low level 0, and the pull-down terminal V0 is the ground terminal GND as an example, the working principle of the automatic restart circuit provided in the embodiment of the present application is described as follows:

[0148] Understandably, Figure 4 The circuit shown is a schematic diagram of the operation of the automatic restart circuit in the unpowered state. The unpowered state may also refer to a state in which the client system (i.e., the client) has not powered on the display panel, and the power input terminal Vin has not received a power supply voltage such as 3.3V. Among them, the common contact of the single-contact relay is disconnected from the normally open contact J1, the common contact of the double-contact relay is connected to the normally closed contact J2, and disconnected from the normally open contact J3, and the photocoupler does not operate. On this basis, it can be seen that the power input terminal Vin is disconnected from the power output terminal Vout; the charge and discharge node N01 is directly connected to the ground terminal GND.

[0149] In the initial stage when the client system (ie, the client) powers on the display panel, that is, Figure 5 As shown, when the power input terminal Vin receives a power supply voltage of 3.3V, the voltage of the first input node N1 (i.e., the first reference voltage obtained by dividing the power supply voltage) can be greater than the voltage of the charge and discharge node N01. At this time, the first comparator Comp1 can output a first control signal of high level 1 to the first control terminal O1. In this way, the single-contact relay can be closed, that is, the common contact in the single-contact relay is connected to the normally open contact J1, and then the power input terminal Vin and the power output terminal Vout can be connected, and the power supply voltage provided by the power input terminal Vin can be transmitted to the power output terminal Vout through the single-contact relay as an output voltage output. In this way, the common contact of the double-contact relay can be further switched from the normally closed contact J2 to the normally open contact J3, that is, the charge and discharge node N01 is disconnected from the ground terminal GND, and is connected to the transfer node N02. Since the scanning circuit has not yet output the scanning signal through the scanning output terminal Gout, the second comparator Comp does not work, the photocoupler does not act, and the transfer node N02 is also disconnected from the ground terminal GND, so that the charging and discharging node N01 cannot be connected to the ground terminal GND. Therefore, under the action of the RC charging circuit, the charging and discharging node N01 can be charged, and the voltage of the charging and discharging node N01 continues to rise. At the same time, because the power supply voltage is output through the power supply output terminal Vout, it can be known that the PMIC can receive the power supply voltage, and then the PMIC can power the display panel based on the power supply voltage to start the display panel, and each circuit can start the initialization process. For example, the scanning circuit can start to prepare to output the scanning signal through the scanning output terminal Gout to light up the pixels in the display panel.

[0150] After initialization is complete, Figure 6As shown in FIG. 1 , assuming that the display panel has no fault, the scan signal outputted through the scan output terminal Gout can be: Figure 6 The normal waveform (e.g., sine wave) shown. On this basis, the voltage of the third input node N3 (i.e., the state indication voltage recorded above) can change with the scanning signal, that is, it is a high level 1 and a 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 a high level 1 to the second control terminal O2. In this way, the light emitter LD in the photocoupler can emit light, and after the light is irradiated on the light receiver LC, the light receiver LC can generate current, and the photocoupler is turned on to connect the transfer node N02 with the ground terminal GND, so that the charge and discharge node N01 is connected to the ground terminal GND through the photocoupler, and then the charge and discharge node N01 can be discharged, that is, the voltage of the charge and discharge node N01 is pulled down. On the basis that the voltage of the charge and discharge node N01 is pulled down, the first comparator Comp1 can always maintain the first control signal of the output high level 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 turned on, so that the PMIC can reliably drive the display panel to display.

[0151] When the display panel fails and cannot display normally, Figure 7 As shown, at this time, the scanning signal outputted through the scanning output terminal Gout can be Figure 7 Abnormal waveform shown. For example, it is always high level 1 or low level 0. On this basis, 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. Furthermore, the second comparator Comp2 can output a second control signal of low level 0 to the second control terminal O2. In this way, the light emitter LD in the photocoupler can stop emitting light, and the light receiver LC cannot generate current due to not receiving light. The photocoupler is turned off to disconnect the transfer node N02 from the ground terminal GND, so that the charge and discharge node N01 is disconnected from the ground terminal GND. Therefore, under the action of the charging circuit 03, the charge and discharge node N01 will be charged, that is, the voltage of the charge and discharge node N01 will continue to rise. When the voltage of the charge and discharge node N01 rises to a value greater than the voltage of the first input node N1, such as Figure 7In the path (1) shown, the first comparator Comp1 can output a first control signal of low level 0 to the first control terminal 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 terminal Vin is disconnected from the power output terminal Vout, and the power voltage can no longer be transmitted to the power output terminal Vout. As a result, 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 connected to the ground terminal GND to discharge the charge-discharge node N01, that is, the voltage of the charge-discharge node N01 is released and dropped; but also the PMIC can stop supplying power to the display panel, so that the display panel is shut down. When the voltage of the charge-discharge node N01 drops to a value lower than the voltage of the first input node N1, as shown in FIG. Figure 7 In the path (2) shown, the first comparator Comp1 can output the first control signal of high level 1 to the first control terminal O1 again, so that the single-contact relay is closed, that is, the common contact in the single-contact relay is connected to the normally open contact J1, and then the power input terminal Vin and the power output terminal Vout are connected again, and the power voltage is transmitted to the power output terminal Vout again, so that the PMIC supplies power to the display panel again to restart the display panel. In this way, an automatic restart of the display panel is completed.

[0152] Optionally, combined Figures 4 to 7 Example record, Figure 8 A schematic diagram schematically shows a change in the voltage of the third input node N3 along with the scan signal outputted by the scan output terminal Gout. Fig. 9 A timing simulation diagram of an automatic restart circuit is schematically shown.

[0153] Combination Figure 8 It can be seen that the high and low levels of the scanning signal can cause the voltage of the third input node N3 to change. Therefore, the voltage of the third input node N3 can reliably reflect whether the display panel has a fault.

[0154] Combination Fig. 9 It can be seen that when the power is turned on normally and the display panel does not fail, the scan output terminal Gout can output the scan signal normally, so that the voltage of the charge-discharge node N01 can be continuously 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 terminal Vin and the power output terminal Vout are always turned on, so that the PMIC can reliably drive the display panel to display the picture based on the power voltage provided by the power input terminal Vin. Fig. 9After the abnormality is shown), the scan signal output by the scan output terminal Gout is abnormal, such as a high level or a low level, so that the voltage of the third input node N3 can be a constant level (such as a low level), and the voltage of the charge-discharge node N01 cannot be refreshed. At this time, under the action of the RC charging circuit, the voltage of the charge-discharge node N01 will continue to increase. When the voltage of the charge-discharge node N01 increases to a voltage greater than the voltage of the first input node N1, the power input terminal Vin and the power output terminal Vout will be disconnected, and the PMIC will stop supplying power to the display panel, and the display panel will be shut down, and the charge-discharge node N01 will be directly connected to the ground terminal GND, and the charge-discharge node N01 will be discharged, that is, the voltage of the charge-discharge node N01 will drop again. When the voltage of the charge-discharge node N01 drops to a voltage less than the first input node N1, the power input terminal Vin and the power output terminal Vout will be turned on again, and the PMIC will supply power to the display panel again, and the display panel will be turned on. Thus, an automatic restart is completed.

[0155] Based on the foregoing records, it can be known that the embodiment of the present application provides an automatic restart circuit for the display panel, also known as the Auto Reset circuit. The circuit can automatically detect whether the display panel is faulty, and can automatically restart the display panel from off to on when a fault is detected in the display panel. In this way, the adaptability of the display panel in 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 security of the display screen of the vehicle-mounted display panel can be improved, so that the display panel can start automatically after a crash. In short, the automatic restart circuit can not only improve the reliability, security and adaptability of the display panel, but also enhance the competitiveness of the product. Of course, the automatic restart circuit is not limited to application to display panels. For example, it can also be applied to any other product that needs to automatically restart in case of a fault.

[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 charging or discharging of the charge and discharge nodes based on the scanning signal reflecting whether the display panel is faulty, and control the on-off of the power input terminal and the power management circuit based on the voltage of the charge and discharge node. Therefore, when the display panel fails, the power input terminal can be disconnected from the power management circuit by controlling the power input terminal to stop supplying power to the display panel and control the display panel to shut down. When the display panel returns to normal, the power input terminal can be connected to the power management circuit by controlling the power management circuit to supply power to the display panel again and control the display panel to start up, thereby completing an automatic restart of the display panel.

[0157] The present application also provides a method for automatically restarting a display panel, which can be applied to Figures 1 to 4 Any of the automatic restart circuits shown. Fig.10 As shown, the method includes:

[0158] Step 1001, 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 the power supply voltage input from the power supply input terminal and the voltage of the charge and discharge node, and outputs a second control signal of a first level to the second control terminal based on the power supply voltage and the scan signal, the switch circuit controls the power supply input terminal and the power supply output terminal to be connected in response to the first control signal of the first level, controls the charge and discharge node to be disconnected from the pull-down terminal in response to the output voltage output through the power supply output terminal, and controls the charge and discharge node to be connected to the pull-down terminal in response to the output voltage and the second control signal of the first level, so that the charge and discharge node is discharged.

[0159] Step 1002, 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 and discharge node to be disconnected from the pull-down terminal in response to the output voltage and the second control signal of the second level, so that the charge and discharge node is charged; when the charge and 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 and discharge node; the control circuit controls the power supply input terminal to be disconnected from the power supply output terminal in response to the first control signal of the second level, and controls the charge and discharge node to be turned on from the pull-down terminal in response to the output voltage, so that the charge and discharge node is discharged again; when the charge and discharge node is discharged to be less than the power supply voltage, the control circuit sends a first control signal of a first level to the first control terminal based on the power supply voltage and the level of the charge and discharge node.

[0160] It can be understood that since the automatic restart method has basically the same implementation method and technical effects as the automatic restart circuit described above, for the purpose of brevity, the implementation method and technical effects of the automatic restart method will not be repeatedly described here.

[0161] The present application also provides a display module. Fig.11 As shown, the display module includes: a display panel (ie, Panel), a scanning circuit ( Fig.11 not shown), a power management circuit (ie, a PMIC), and Figures 1 to 4 Any of the automatic restart circuits (ie, Auto Reset circuits) shown.

[0162] The automatic restart circuit is connected to the scan output terminal Gout of the scan circuit and the power management circuit respectively, and is also connected to the power input terminal Vin; the scan output terminal Gout of the scan circuit is also connected to the pixel ( Fig.11 The power management circuit is also connected to the display panel.

[0163] The scanning circuit is used to output a scanning signal 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 of the power input terminal Vin and the power management circuit based on the scanning signal.

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

[0166] That is, based on the foregoing record, in the embodiment of the present application, the PMIC can be indirectly connected to the power input terminal Vin via the automatic restart circuit. The automatic restart circuit can monitor whether the display panel fails based on the scan signal output by the scan circuit via the scan output terminal Gout, and can control the power input terminal Vin to be turned on with the PMIC when the display panel does not fail, so that the PMIC supplies power to the display panel based on the power voltage provided by the power input terminal Vin to start the display panel, and can control the power input terminal Vin to be disconnected from the PMIC when the display panel fails, so that the PMIC stops supplying power to the display panel to shut down the display panel. 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 makes it impossible to monitor whether the display panel fails, and it is impossible to control the display panel to restart when the display panel fails.

[0167] Optionally, combined Fig.11 It can also be known from the previous records that the PMIC can be connected to the TCON and the IC on the COF to power the TCON and the IC on the COF, so that the IC on the TCON and the COF controls the display panel to display the screen. In addition, the PMIC, TCON, and the Auto Reset circuit recorded in the embodiment of the present application can all be integrated on the same PCB. The scanning circuit (such as the GOA circuit) can be set on the display panel to facilitate the narrow frame design. Of course, the setting position here is only a schematic illustration.

[0168] It is understandable that, since the display module has substantially the same technical effects as the automatic restart circuit described above, the technical effects of the display module will not be described repeatedly here for the purpose of brevity.

[0169] Optionally, the display module described in the embodiment of the present application may be an OLED display device. The display device may be any appropriate display device, including but not limited to screens in the automotive field, screens in the aviation field, mobile phones, tablet computers, televisions, monitors, laptop computers, digital photo frames, navigators, and e-books, and any other products or components with display functions.

[0170] It should be noted that the terms used in the implementation methods of this application are only used to explain the embodiments of this application, and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in the implementation methods of this application should be the common meanings understood by people with general skills in the field to which this application belongs.

[0171] For example, the words "first", "second", "third" and similar words used in the patent application specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantitative limitation, but indicate the existence of at least one. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. The character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0172] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall 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 comprises: a control circuit, connected to the power input terminal, the charge-discharge node, the scan output terminal, the first control terminal and the second control terminal respectively, and used to output a first control signal to the first control terminal based on the power voltage input to the power input terminal and the voltage of the charge-discharge node, and output a second control signal to the second control terminal based on the power voltage and the scan signal output from the scan output terminal; a switch circuit, connected to the power input terminal, the power output terminal, the second control terminal, the charge-discharge node and the pull-down terminal respectively, and used to control the on-off of the power input terminal and the power output terminal in response to the first control signal, control the on-off of the charge-discharge node and the pull-down terminal in response to the output voltage outputted through the power output terminal, and control the on-off of the charge-discharge node and the pull-down terminal in response to the output voltage and the second control signal; Wherein, the power output end is used to connect to the power management circuit; and when the charge and discharge node is disconnected from the pull-down end, the charge and discharge node is charged, and when the charge and discharge node is connected to the pull-down end, the charge and discharge node is discharged.

2. The automatic restart circuit according to claim 1, characterized in that: The control circuit comprises: a first control subcircuit connected to the power input terminal, the charge and discharge node and the first control terminal respectively, and configured to generate a first reference voltage based on the power voltage, compare the first reference voltage with the voltage of the charge and discharge node, and output the first control signal to the first control terminal; The second control subcircuit is respectively connected to the power input terminal, the scan output terminal and the second control terminal, and is used to generate a second reference voltage based on the power supply voltage, generate a state indication voltage based on the scan signal, compare the second reference voltage and the state 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 subcircuit comprises: a first voltage dividing unit, connected to the power input terminal and the first input node respectively, and used for dividing the power voltage to generate the first reference voltage, and outputting the first reference voltage to the first input node; The first comparison unit is connected to the first input node, the charge and discharge node and the first control terminal respectively, and is used to compare the first reference voltage with the voltage of the charge and discharge 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 dividing unit includes: a first resistor and a second resistor; the first comparing 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 a series node of the first resistor and the second resistor is connected to the first input node; The positive phase input terminal of the first comparator is connected to the first input node, the negative phase input terminal of the first comparator is connected to the charge and 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 subcircuit comprises: A second voltage dividing unit, connected to the second input node of the power input terminal respectively, and used for dividing the power voltage to generate the second reference voltage, and outputting the second reference voltage to the second input node; a voltage control unit, connected to the scan output terminal and the third input node respectively, and used to generate the state 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 state 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 dividing unit includes: a third resistor and a fourth resistor; the voltage control unit includes: a fifth resistor and a first capacitor; the second comparing 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 a series 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 non-inverting 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 switch circuit comprises: a first switch subcircuit, connected to the first control terminal, the power input terminal and the power output terminal respectively, and used for controlling the on / off of the power input terminal and the power output terminal in response to the first control signal; A second switch subcircuit is connected to the power output terminal, the charge and discharge node, the pull-down terminal and the transfer node respectively, and is used to control the connection and disconnection of the charge and discharge node and the pull-down terminal, and control the connection and disconnection of the charge and discharge node and the transfer node in response to the output voltage; The third switch sub-circuit is connected to the second control terminal, the transfer node and the pull-down terminal respectively, and is used to control the connection and disconnection of the transfer node and the pull-down terminal in response to the second control signal.

8. The automatic restart circuit according to claim 7, characterized in that: The first switch subcircuit 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.

9. The automatic restart circuit according to claim 7, characterized in that: The second switch subcircuit includes: a double-contact relay; The coil in the double-contact relay is connected between the power output end and the pull-down end, the common contact in the double-contact relay is connected to the charging and discharging node, the normally closed contact in the double-contact electrical appliance is used to connect to the pull-down end, and the normally open contact in the double-contact relay is used to connect to the transfer node.

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

11. The automatic restart circuit according to claim 7, characterized in that: The third switch subcircuit comprises: a photoelectric coupler; The light emitter in the photoelectric coupler is connected between the second control end and the pull-down end, and the light receiver in the photoelectric coupler is connected between the transfer node and the pull-down end.

12. 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 and discharging node respectively, and is used to charge the charging and discharging node based on the power supply voltage.

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

14. A method for automatically restarting a display panel, characterized in that: Applied to the automatic restart circuit of the display panel according to any one of claims 1 to 13, the method comprises: When the scan signal outputted 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 the power supply voltage inputted from the power supply input terminal and the voltage of the charge-discharge node, and outputs a second control signal of a first level to the second control terminal based on the power supply voltage and the scan signal, the switch circuit controls the power supply input terminal to be connected with the power supply output terminal in response to the first control signal of the first level, controls the charge-discharge node to be disconnected from the pull-down terminal in response to the output voltage outputted from the power supply output terminal, and controls the charge-discharge node to be connected with the pull-down terminal in response to the output voltage and the second control signal of the first level, so that the charge-discharge 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 switch circuit controls the charge and discharge node to be disconnected from the pull-down terminal in response to the output voltage and the second control signal of the second level, so that the charge and discharge node is charged; when the charge and discharge 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 charge and discharge node; the control circuit controls the power supply input terminal to be disconnected from the power supply output terminal in response to the first control signal of the second level, and controls the charge and discharge node to be turned on with the pull-down terminal in response to the output voltage, so that the charge and discharge node is discharged again; when the charge and discharge node is discharged to a level less than the power supply voltage, the control circuit sends a first control signal of a first level to the first control terminal based on the power supply voltage and the level of the charge and discharge node.

15. A display module, characterized in that: The display module comprises: a display panel, a scanning circuit, a power management circuit, and an automatic restart circuit of the display panel according to any one of claims 1 to 13; The automatic restart circuit is connected to the scan output terminal of the scan circuit and the power management circuit respectively, and is also connected to the power input terminal; the scan output terminal of the scan circuit is also connected to the pixel in the display panel; the power management circuit is also connected to the display panel; The scanning circuit is used to: output a scanning signal to the pixels in the display panel via the scanning output terminal; The automatic restart circuit is used to: control the on-off of 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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