Display panel and display device

Abstract

A display panel and a display device are provided, belonging to the field of display technology. In the display panel, a pixel driving circuit is indirectly coupled to an external power supply through a protection circuit. In the protection circuit, the protection subcircuit can control the flow direction of an external power signal provided by an external power supply based on the received first power signal and the second power signal. The control subcircuit can transmit a switch control signal to the switch subcircuit based on the first power signal, the second power signal and the external power signal, so that the switch subcircuit controls the on-off of the external power supply and the pixel driving circuit. In this way, the power signal can be flexibly set so that when there is no overvoltage or undervoltage, the external power signal will further flow to the pixel driving circuit to achieve overvoltage protection and undervoltage protection. And when there is no overcurrent, the external power supply and the pixel driving circuit are controlled to be turned on, so that the external power signal is transmitted to the pixel driving circuit to achieve overcurrent protection. Thereby, damage to the pixel driving circuit is avoided.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] Silicon-based organic light-emitting diode (OLED) panel is a display panel that integrates a large number of silicon-based OLEDs on a relatively small (e.g., 2-inch) silicon-based substrate. It has the advantages of self-luminescence, low power consumption, miniaturization, and high resolution, and is often used in augmented reality or virtual reality devices.

[0003] At present, silicon-based OLED panels generally include: silicon-based integrated circuits (ICs) and multiple silicon-based OLEDs, and silicon-based ICs are also called pixel driving circuits. Among them, the silicon-based IC is coupled to multiple silicon-based OLEDs and is used to drive multiple silicon-based OLEDs to emit light, so that the silicon-based OLED panel displays. Before the silicon-based OLED panel leaves the factory, a high-voltage fuse mechanism is input to the silicon-based IC through a peripheral circuit including an external power supply to solidify the correction information including brightness, color point and display algorithm into the silicon-based OLED panel. This process can be called a one-time program (OTP) action.

[0004] However, once an abnormality occurs in the peripheral circuit (for example, the voltage provided by the external power supply is inaccurate), it will inevitably cause damage to the internal circuit of the silicon-based IC, and in severe cases, the silicon-based IC may be burned. Summary of the invention

[0005] A display panel and a display device are provided, which can solve the problem in the related art that the internal circuit of the silicon-based IC is damaged due to abnormality of the peripheral circuit. The technical solution is as follows:

[0006] In one aspect, a display panel is provided, the display panel comprising: a pixel driving circuit and a protection circuit, the protection circuit being coupled to the pixel driving circuit and also being used to couple to an external power source, receiving an external power signal provided by the external power source and transmitting the signal to the pixel driving circuit;

[0007] Wherein, the external power supply has a first pole and a second pole; the protection circuit comprises: a protection subcircuit, a control subcircuit and a switch subcircuit;

[0008] The protection subcircuit is coupled to the first power supply terminal and the second power supply terminal respectively, and is also used to couple to both the first pole and the second pole of the external power supply, and the second pole of the external power supply is also coupled to the second power supply terminal, and the protection subcircuit is used to control the flow direction of the external power supply signal based on the first power supply signal provided by the first power supply terminal, the second power supply signal provided by the second power supply terminal, and the external power supply signal;

[0009] The control subcircuit is coupled to the first power supply terminal, the second power supply terminal and the control terminal of the switch subcircuit respectively, and is also used to couple to the first pole of the external power supply, and the control subcircuit is used to transmit a switch control signal to the control terminal of the switch subcircuit based on the first power supply signal, the second power supply signal and the external power supply signal;

[0010] The input end of the switch subcircuit is used to couple with the first pole of the external power supply through the control subcircuit, the output end of the switch subcircuit is coupled with the pixel driving circuit, and the switch subcircuit is used to control the on and off of the external power supply and the pixel driving circuit based on the switch control signal.

[0011] Optionally, the voltage of the first power signal is greater than the voltage of the second power signal, and the voltage of the first power signal is not less than an upper limit value of a voltage required for the normal operation of the pixel driving circuit, and the voltage of the first power signal is not greater than a lower limit value of a voltage required for the normal operation of the pixel driving circuit;

[0012] The protection subcircuit is used for controlling the external power signal to be output to the pixel driving circuit if the voltage of the external power signal is within the range of the voltage required for normal operation, controlling the external power signal to be output from the first power supply terminal if the voltage of the external power signal is not within the range of the voltage required for normal operation and is greater than the voltage of the first power signal, and controlling the external power signal to be output to the external power supply if the voltage of the external power signal is not within the range of the voltage required for normal operation and is less than the voltage of the second power signal;

[0013] The control subcircuit is used for transmitting a switch control signal of a first potential to the control end of the switch subcircuit based on the first power signal, the second power signal and the external power signal if the current of the external power signal is not within the current range required for the normal operation of the pixel driving circuit, and transmitting a switch control signal of a second potential to the control end of the switch subcircuit based on the first power signal, the second power signal and the external power signal if the current of the external power signal is within the current range required for the normal operation of the pixel driving circuit;

[0014] The switch subcircuit is used to control the external power supply to be disconnected from the pixel driving circuit based on the switch control signal of the first potential, and to control the external power supply to be connected to the pixel driving circuit based on the switch control signal of the second potential.

[0015] Optionally, the protection subcircuit includes: an overvoltage protection diode and an undervoltage protection diode;

[0016] Wherein, the anode of the overvoltage protection diode is coupled to the first electrode of the external power supply, and the cathode of the overvoltage protection diode is coupled to the first power supply terminal;

[0017] The anode of the undervoltage protection diode is coupled to the second electrode of the external power supply and is also coupled to the second power supply terminal. The anode of the overvoltage protection diode is coupled to the first electrode of the external power supply.

[0018] Optionally, the control subcircuit includes: a frame measurement unit and a primary feedback unit;

[0019] Two ends of the frame measuring unit are respectively coupled to the first pole of the external power supply and the input end of the switch subcircuit, and the frame measuring unit is used to measure the current of the external power supply signal;

[0020] The first-level feedback unit is respectively coupled to the two ends of the frame measurement unit, the first power supply end, the second power supply end and the control end of the switch sub-circuit, and the first-level feedback unit is used to generate a switch control signal based on the current of the first power supply signal, the second power supply signal and the external power supply signal, and transmit the switch control signal to the control end of the switch sub-circuit.

[0021] Optionally, the frame measurement unit includes: a sampling resistor;

[0022] A first end of the sampling resistor is coupled to a first electrode of the external power source, and a second end of the sampling resistor is coupled to an input end of the switch sub-circuit.

[0023] Optionally, the first-level feedback unit includes: a first differential amplifier and a first resistor;

[0024] Among them, the positive input terminal and the negative input terminal of the first differential amplifier are respectively coupled to the two ends of the frame measurement unit, the power supply terminal of the first differential amplifier is respectively coupled to the first power supply terminal and the second power supply terminal, the output terminal of the first differential amplifier is coupled to the first end of the first resistor, and the second end of the first resistor is coupled to the control end of the switch sub-circuit.

[0025] Optionally, the control subcircuit further includes: a switch unit;

[0026] The switch unit is coupled to the enable power supply terminal, the first-level feedback unit and the control terminal of the switch sub-circuit respectively. The switch unit is used to receive a switch signal and to control the control terminal of the switch sub-circuit to be connected with the enable power supply terminal based on the switch signal, or to control the control terminal of the switch sub-circuit to be connected with the first-level feedback unit. The switch sub-circuit is also used to control the external power supply to be disconnected from the pixel driving circuit based on the enable power supply signal provided by the enable power supply terminal.

[0027] Optionally, the switch unit includes: a single-pole double-throw switch;

[0028] The static contact of the single-pole double-throw switch is coupled to the control end of the switch sub-circuit, and the two moving contacts of the single-pole double-throw switch are coupled to the primary feedback unit and the enabling power supply end respectively.

[0029] Optionally, the control subcircuit further includes: a secondary feedback unit;

[0030] The secondary feedback unit is coupled between the primary feedback unit and the control end of the switch sub-circuit, and is also coupled to the first power supply end, the second power supply end and the third power supply end respectively. The secondary feedback unit is used to step down the switch control signal generated by the primary feedback unit based on the external power supply signal, the first power supply signal, the second power supply signal and the third power supply signal provided by the third power supply end, and transmit it to the control end of the switch sub-circuit.

[0031] Optionally, the secondary feedback unit includes: a threshold setting subunit and a threshold control subunit;

[0032] The threshold setting subunit is coupled to the second power supply terminal, the third power supply terminal and the threshold control subunit respectively, and the threshold setting subunit is used to transmit a reference power supply signal to the threshold control subunit based on the second power supply signal and the external power supply signal, wherein the potential of the reference power supply signal is greater than the potential of the switch control signal;

[0033] The threshold control subunit is also coupled to the first power supply end, the second power supply end, the first-level feedback unit and the control end of the switch subcircuit respectively. The threshold control subunit is used to step down the switch control signal generated by the first-level feedback unit based on the first power supply signal, the second power supply signal and the reference power supply signal, and transmit it to the control end of the switch subcircuit.

[0034] Optionally, the threshold setting subunit includes: a plurality of voltage-dividing resistors coupled to each other, and at least one of the voltage-dividing resistors is a variable resistor;

[0035] The plurality of voltage-dividing resistors are also coupled to the threshold control subunit, and a portion of the voltage-dividing resistors are coupled to the second power supply terminal, and another portion of the voltage-dividing resistors are coupled to the third power supply terminal.

[0036] Optionally, the threshold setting subunit includes: a first voltage-dividing resistor and a second voltage-dividing resistor, and the second voltage-dividing resistor is a variable resistor;

[0037] The first end of the first voltage-dividing resistor is coupled to the third power supply end, the second end of the first voltage-dividing resistor is coupled to the threshold control subunit, and the third power supply end is also used to couple to the first pole of the external power supply, and the third power supply signal is the external power supply signal;

[0038] A first end of the second voltage-dividing resistor is coupled to the second power supply end, and a second end of the second voltage-dividing resistor is coupled to the threshold control subunit;

[0039] Furthermore, the second end of the first voltage-dividing resistor is coupled to the second end of the first voltage-dividing resistor.

[0040] Optionally, the threshold control subunit includes: a second differential amplifier and a second resistor;

[0041] Among them, the positive input terminal of the second differential amplifier is coupled to the threshold setting subunit, the negative input terminal of the second differential amplifier is coupled to the first-level feedback unit, the power supply terminal of the second differential amplifier is coupled to the first power supply terminal and the second power supply terminal respectively, the output terminal of the second differential amplifier is coupled to the first end of the second resistor, and the second end of the second resistor is coupled to the control end of the switch subcircuit.

[0042] Optionally, the switch subcircuit includes: a switch transistor and a third resistor;

[0043] The gate of the switch transistor is coupled to the control subcircuit as a control terminal of the switch subcircuit, the first electrode of the switch transistor is coupled to the first electrode of the external power supply through the control subcircuit as an input terminal of the switch subcircuit, and the second electrode of the switch transistor is coupled to the pixel driving circuit as an output terminal of the switch subcircuit;

[0044] A first end of the third resistor is coupled to the gate of the switch transistor, and a second end of the third resistor is coupled to the first electrode of the switch transistor.

[0045] Optionally, the pixel driving circuit includes: a one-time programming module;

[0046] The protection circuit is coupled to the one-time programming module and is used to transmit the received external power supply signal to the one-time programming module.

[0047] On the other hand, a display device is provided, comprising: the display panel as described in the above aspect, and a plurality of pixels located on the display panel;

[0048] The pixel driving circuit in the display panel is coupled to the plurality of pixels and is used to drive the plurality of pixels to emit light.

[0049] In summary, the beneficial effects brought about by the technical solution provided by the embodiments of the present disclosure may at least include:

[0050] A display panel and a display device are provided. The display panel includes a pixel driving circuit and a protection circuit that indirectly couples the pixel driving circuit to an external power supply. The protection circuit includes a protection subcircuit, a control subcircuit and a switch subcircuit. The protection subcircuit can control the flow direction of the external power signal provided by the external power supply based on the received first power signal and the second power signal. In this way, the first power signal and the second power signal can be flexibly set so that when there is no overvoltage and no undervoltage, the external power signal will further flow to the pixel driving circuit, thereby realizing overvoltage protection and undervoltage protection of the pixel driving circuit. The control subcircuit can transmit a switch control signal to the switch subcircuit based on the first power signal, the second power signal and the external power signal, so that the switch subcircuit controls the on and off of the external power supply and the pixel driving circuit. In this way, the first power signal and the second power signal can be flexibly set so that when there is no overcurrent pressure, the external power supply and the pixel driving circuit are controlled to be turned on, thereby causing the external power signal to be transmitted to the pixel driving circuit, thereby realizing overcurrent protection of the pixel driving circuit. Avoid damaging the pixel driving circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0052] Figure 1 is a schematic diagram of a circuit structure of a display panel provided by an embodiment of the present disclosure;

[0053] Figure 2 is a schematic diagram of a circuit structure of another display panel provided by an embodiment of the present disclosure;

[0054] Figure 3is a schematic diagram of a working protection sub-circuit during normal operation provided by an embodiment of the present disclosure;

[0055] Figure 4 is a schematic diagram of a working state of a protection sub-circuit in an undervoltage state provided by an embodiment of the present disclosure;

[0056] Figure 5 is a schematic diagram of a working method of protecting a sub-circuit under an overvoltage state provided by an embodiment of the present disclosure;

[0057] Figure 6 is a schematic diagram of a circuit structure of another display panel provided in an embodiment of the present disclosure;

[0058] Figure 7 is a schematic diagram of a circuit structure of another display panel provided in an embodiment of the present disclosure;

[0059] Figure 8 is a schematic diagram of a circuit structure of another display panel provided in an embodiment of the present disclosure;

[0060] Fig. 9 is a schematic diagram of a circuit structure of another display panel provided in an embodiment of the present disclosure;

[0061] Fig.10 is a schematic diagram of a circuit structure of another display panel provided in an embodiment of the present disclosure;

[0062] Fig.11 is a schematic diagram of a circuit structure of another display panel provided in an embodiment of the present disclosure;

[0063] Fig.12 is a schematic diagram of the operation of each circuit in normal operation provided by an embodiment of the present disclosure;

[0064] Fig.13 is a schematic diagram of the operation of each circuit in an overcurrent state provided by an embodiment of the present disclosure;

[0065] Fig.14 is a circuit block diagram provided by an embodiment of the present disclosure;

[0066] Fig.15 is another circuit block diagram provided by an embodiment of the present disclosure;

[0067] Fig.16 It is a structural block diagram of the overall circuit inside a display panel in the related art;

[0068] Fig.17 is a structural block diagram of an overall circuit inside a display panel provided by an embodiment of the present disclosure;

[0069] Fig.18 It is a structural schematic diagram of a display device provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0070] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0071] Figure 1 is a schematic diagram of the structure of a display panel provided by an embodiment of the present disclosure. Figure 1 As shown, the display panel includes: a pixel driving circuit 01 and a protection circuit 02.

[0072] The protection circuit 02 is coupled to the pixel driving circuit 01, and is also used to couple to an external power source (power, PWR) 10 to receive an external power signal provided by the external power source 10 and transmit it to the pixel driving circuit 01. That is, the pixel driving circuit 01 can be indirectly coupled to the external power source 01 through the protection circuit 02 to receive the external power signal transmitted by the protection circuit 02.

[0073] Optionally, the protection circuit 02 can be coupled to the external power supply 10 through a power input pin (also called a pin). When the display panel is a silicon-based OLED display panel, the pixel driving circuit 01 can be called a silicon-based IC, and the pixel driving circuit 01 can include an OTP module, which can be indirectly coupled to the external power supply 10 through the protection circuit 02 to receive an external power signal. Correspondingly, the external power signal is the voltage input when performing the OTP action. The power input pin can also be called an OTP input pin, referred to as OTP_PWR.

[0074] As for the related technology of direct coupling between the OTP module and the external power supply 10, since it is used by simply stipulating the voltage limit of the external power supply signal, once the voltage is inaccurate due to factors such as peak voltage, surge or static electricity, it will inevitably cause damage to the internal structure of the silicon-based IC. In addition, if the external power supply 10 does not limit the current, it will inevitably cause damage to the internal structure of the silicon-based IC when the current is too large, and in severe cases, it may also burn the internal structure of the silicon-based IC. The embodiment of the present disclosure can avoid the problem of damage or even burning of the internal structure of the pixel driving circuit 01 due to abnormal voltage or excessive current of the external power supply signal provided by the external power supply 10 by setting a protection circuit 02 between the pixel driving circuit 01 and the external power supply 10, and can play a protective role in the pixel driving circuit 01.

[0075] Continue to refer Figure 1It can be seen that in the embodiment of the present disclosure, the external power supply 10 has a first pole and a second pole. Among them, one of the first pole and the second pole can be a positive pole (+), and the other pole can be a negative pole (-). The embodiment of the present disclosure is schematically illustrated with the first pole being a positive pole and the second pole being a negative pole. And, the protection circuit 02 includes: a protection subcircuit 021, a control subcircuit 022, and a switch subcircuit 023.

[0076] The protection subcircuit 021 is coupled to the first power supply terminal V1 and the second power supply terminal V2 respectively, and is also used to couple to the first pole and the second pole of the external power supply 10. The second pole of the external power supply 10 is also coupled to the second power supply terminal V2. Figure 1 The protection subcircuit 021 can be coupled to the second pole of the external power source 10, and can also be coupled to the second power source terminal V2. In addition, the protection subcircuit 021 is used to control the flow direction of the external power signal based on the first power signal provided by the first power source terminal V1, the second power signal provided by the second power source terminal V2, and the external power signal.

[0077] For example, the voltage of the first power signal and the voltage of the second power signal can be flexibly set based on the voltage required for normal operation of the pixel driving circuit 01 (e.g., the voltage within the OTP power range), so that when the voltage of the external power signal is within the voltage range required for normal operation, the external power signal is further controlled to be transmitted to the pixel driving circuit 01, thereby realizing overvoltage protection and undervoltage protection of the pixel driving circuit 01. Accordingly, the protection subcircuit 021 can also be called an overvoltage and undervoltage protection part.

[0078] The control subcircuit 022 is respectively coupled to the first power supply terminal V1, the second power supply terminal V2 and the control terminal (not shown) of the switch subcircuit 023, and is also used to couple to the first pole of the external power supply 10. The control subcircuit 022 is used to transmit a switch control signal to the control terminal of the switch subcircuit 023 based on the first power supply signal, the second power supply signal and the external power supply signal.

[0079] For example, the control subcircuit 022 can amplify the voltage reflected by the current of the collected external power signal based on the first power signal and the second power signal to generate a switch control signal and transmit it to the control end of the switch subcircuit 023. For example, the control subcircuit 022 can generate a shutdown control signal when the current of the external power signal is not within the current range required for the normal operation of the pixel driving circuit 01 and is greater than the upper limit of the current range required for the normal operation of the pixel driving circuit 01, that is, when the external power supply 10 has an overcurrent. And the control subcircuit 022 can generate a start control signal when the current of the external power signal is within the current range required for the normal operation of the pixel driving circuit 01, that is, when the external power supply 10 has not an overcurrent.

[0080] Optionally, the shutdown control signal and the startup control signal may be two switch control signals with different potentials. For example, when the switch subcircuit 023 includes a P-type transistor that is turned on in response to a low potential and turned off in response to a high potential, the potential of the shutdown control signal may be greater than the potential of the startup control signal. When the switch subcircuit 023 includes an N-type transistor that is turned on in response to a high potential and turned off in response to a low potential, the potential of the shutdown control signal may be less than the potential of the startup control signal.

[0081] The input end (not shown in the figure) of the switch subcircuit 023 is used to couple with the first pole of the external power source 10 through the control subcircuit 022, and the output end (not shown in the figure) of the switch subcircuit 023 is coupled with the pixel driving circuit 01. That is, the input end of the switch subcircuit 023 is coupled with the control subcircuit 02 coupled with the external power source 10, thereby indirectly coupling with the external power source 10. On this basis, it can be considered that the control subcircuit 022 and the switch subcircuit 023 are connected in series between the external power source 10 and the pixel driving circuit 01, so that the pixel driving circuit 01 is indirectly coupled with the external power source 10. The switch subcircuit 023 is used to control the on and off of the external power source 10 and the pixel driving circuit 01 based on the switch control signal.

[0082] For example, the switch subcircuit 023 can control the disconnection between the external power supply 10 and the pixel driving circuit 01 based on the shutdown control signal transmitted by the control subcircuit 022. At this time, the external power signal provided by the external power supply 10 cannot be transmitted to the pixel driving circuit 01. And, the switch subcircuit 023 can control the conduction between the external power supply 10 and the pixel driving circuit 01 based on the start control signal transmitted by the control subcircuit 022. At this time, the external power signal provided by the external power supply 10 can be transmitted to the pixel driving circuit 01. Combined with the above records about the shutdown control signal and the switch control signal, it can be known that because the shutdown control signal is a switch control signal generated under the overcurrent condition, and the start control signal is a switch control signal generated under the non-overcurrent condition, it is possible to ensure that the display panel works normally, and also realize overcurrent protection for the pixel driving circuit 01. Correspondingly, the switch subcircuit 023 can also be called an overcurrent control part.

[0083] It should be noted that the reference Figure 1It can also be seen that the second pole of the external power supply 10 can also be directly coupled to the pixel driving circuit 01. That is, the pixel driving circuit 01 can be indirectly coupled to the positive pole of the external power supply 10 through the control subcircuit 022 and the switch subcircuit 023. The signal line that indirectly couples the pixel driving circuit 01 to the positive pole of the external power supply 10 can be called a first connection line, and the signal line that directly couples the pixel driving circuit 01 to the negative pole of the external power supply 10 can be called a second connection line, and the first connection line and the second connection line form a power signal transmission path. And, it can be considered that the protection subcircuit 021 is coupled to both the first connection line and the second connection line, so as to achieve overvoltage protection and undervoltage protection. And, the protection subcircuit 021 can be as follows Figure 1 As shown, it is coupled between the control sub-circuit 022 and the external power source 10. At this time, the external power signal can flow into the pixel driving circuit 01 through the control sub-circuit 022 and the switch sub-circuit 023 under the flow direction control of the protection sub-circuit 021. Of course, in some embodiments, the protection sub-circuit 021 can also be coupled between the control sub-circuit 022 and the protection sub-circuit 023. At this time, the external power signal can flow into the pixel driving circuit 01 only through the switch sub-circuit 023 under the flow direction control of the protection sub-circuit 021.

[0084] In summary, the embodiment of the present disclosure provides a display panel, which includes a pixel driving circuit and a protection circuit that indirectly couples the pixel driving circuit to an external power supply. The protection circuit includes a protection subcircuit, a control subcircuit and a switch subcircuit. The protection subcircuit can control the flow direction of the external power signal provided by the external power supply based on the received first power signal and the second power signal. In this way, the first power signal and the second power signal can be flexibly set so that when there is no overvoltage and no undervoltage, the external power signal will further flow to the pixel driving circuit, thereby realizing overvoltage protection and undervoltage protection of the pixel driving circuit. The control subcircuit can transmit a switch control signal to the switch subcircuit based on the first power signal, the second power signal and the external power signal, so that the switch subcircuit controls the on and off of the external power supply and the pixel driving circuit. In this way, the first power signal and the second power signal can be flexibly set so that when there is no overcurrent pressure, the external power supply and the pixel driving circuit are controlled to be turned on, thereby causing the external power signal to be transmitted to the pixel driving circuit, thereby realizing overcurrent protection of the pixel driving circuit. Avoid damaging the pixel driving circuit.

[0085] Optionally, in the embodiment of the present disclosure, the voltage of the first power signal may be greater than the voltage of the second power signal, and the voltage of the first power signal may be no less than (i.e., greater than or equal to) an upper limit value of the voltage required for the normal operation of the pixel driving circuit 01, and the voltage of the first power signal may be no greater than (i.e., less than or equal to) a lower limit value of the voltage required for the normal operation of the pixel driving circuit 01.

[0086] Optionally, for the OTP module, the voltage required for the normal operation of the pixel driving circuit 01 may refer to the voltage within the normal range required to be burned into the OTP module. It is generally between 7.25 volts (V) and 7.75V. On this basis, the voltage of the first power signal may be 7.75V, and the first power terminal V1 may be a VCC power terminal. The voltage of the second power signal may be 0, and the second power terminal V2 may be a ground terminal GND.

[0087] Based on the above embodiments, the protection sub-circuit 021 in the embodiments of the present disclosure can be used for:

[0088] If the voltage of the external power signal (e.g., 16V) is not within the voltage range required for the normal operation of the pixel driving circuit 01 and is greater than the voltage of the first power signal (e.g., 7.75V), that is, when the external power supply 10 is over-voltage, the external power signal is controlled to be output from the first power terminal V1.

[0089] Optionally, the first power terminal V1 is also generally coupled to an external electrical appliance to receive a first power signal provided by the external electrical appliance. Accordingly, when an overvoltage occurs in the external power supply 10, the external power signal can be controlled to flow into the external electrical appliance via the first power terminal V1 instead of flowing to the pixel driving circuit 01, so that the overvoltage occurs in an external device other than the display panel, thereby avoiding damage to the pixel driving circuit 01.

[0090] If the voltage of the external power signal (e.g., -2V) is not within the range of the voltage required for the normal operation of the pixel driving circuit 01, and is less than the voltage of the second power signal (e.g., 0), that is, when the external power supply 10 is under-voltage, the external power signal is controlled to be output to the external power supply 10, that is, the external power signal is controlled to flow into the external power supply 10 instead of flowing into the pixel driving circuit 01. Similarly, the under-voltage can occur in external devices other than the display panel, thereby avoiding damage to the pixel driving circuit 01.

[0091] Furthermore, if the voltage of the external power signal (e.g., 7.25V) is within the range of voltages required for the normal operation of the pixel driving circuit 01, that is, it is less than the voltage of the first power signal (e.g., 7.75V) and greater than the voltage of the second power signal (0), that is, when the external power supply 10 is operating normally, the external power signal is controlled to be output to the pixel driving circuit 01, thereby ensuring the normal operation of the pixel driving circuit 10.

[0092] On the basis that the voltage required for the normal operation of the pixel driving circuit 01 is between 7.25V and 7.75V, the current required for the normal operation of the pixel driving circuit 01 may be between 0 and 10 milliamperes (mA).

[0093] The control subcircuit 022 can be used to transmit a switch control signal of a first potential to the control end of the switch subcircuit 023 based on the first power signal, the second power signal and the external power signal if the current of the external power signal (e.g., 120 mA) is not within the range of the current required for the normal operation of the pixel driving circuit 01 (e.g., 0 to 10 mA), that is, when an overcurrent occurs in the external power supply 10. The switch subcircuit 023 can be used to control the external power supply 10 to disconnect from the pixel driving circuit 01 based on the switch control signal of the first potential. At this time, the external power signal provided by the external power supply 10 cannot be transmitted to the pixel driving circuit 01, and overcurrent protection is achieved. The switch control signal of the first potential is the shutdown control signal recorded in the above embodiment.

[0094] Furthermore, the control subcircuit 022 can be used to transmit a switch control signal of a second potential to the control end of the switch subcircuit 023 based on the first power signal, the second power signal and the external power signal if the current of the external power signal (e.g., 1 mA) is within the range of the current required for the normal operation of the pixel driving circuit 01 (e.g., 0 to 10 mA), that is, when the external power supply 10 is operating normally. The switch subcircuit 023 can be used to control the conduction between the external power supply 10 and the pixel driving circuit 01 based on the switch control signal of the second potential. At this time, the external power signal provided by the external power supply 10 can be further transmitted to the pixel driving circuit 01 via the switch subcircuit 023, thereby ensuring the normal operation of the pixel driving circuit 10. The switch control signal of the second potential is the start control signal recorded in the above embodiment.

[0095] Optionally, the first potential may be an invalid potential, and the second potential may be an effective potential. As described in the above embodiment, the first potential may be a low potential relative to the second potential.

[0096] Figure 2 FIG. 1 is a schematic diagram of the structure of another display panel provided by an embodiment of the present disclosure. Figure 2 As shown, the protection sub-circuit 021 may include: an overvoltage protection diode D1 and an undervoltage protection diode D2.

[0097] The anode of the overvoltage protection diode D1 may be coupled to the first electrode (eg, anode +) of the external power source 10 , and the cathode of the overvoltage protection diode D1 may be coupled to the first power source terminal V1 .

[0098] The cathode of the undervoltage protection diode D2 can be coupled to the second electrode (eg, cathode −) of the external power supply 10 , and both can be coupled to the second power supply terminal V2 , and the anode of the overvoltage protection diode D1 can be coupled to the first electrode of the external power supply 10 .

[0099] For example, the voltage range required for normal operation of the pixel driving circuit 10 is 7.25V to 7.75V, and the current required for normal operation is 0 to 10mA. Figure 2 On the basis of Figures 3 to 5 The schematic diagrams of the flow of three external power supply signals are respectively shown when the external power supply 10 is working normally, when the external power supply 10 is undervoltage, and when the external power supply 10 is overvoltage. In addition, it should be noted that: Figures 3 to 5 In the figure, the test signal terminal TEST_V1 is taken as an example to represent the external power supply 10, and the first power terminal V1 shown is the VCC power terminal, and the first power signal provided is 7.75V, and the second power terminal V2 shown is the ground terminal GND provided with a second power signal of 0.

[0100] Example, reference Figure 3 , the voltage of the external power signal is 7.25V (ie, TEST_V1 = 7.25V), that is, the normal 7.25V voltage is used for power supply. On this basis, based on the reverse cutoff characteristics of the diode, since 0 < 7.25V < 7.75V, the overvoltage protection diode D1 and the undervoltage protection diode D2 are both reverse cutoff at this time (the figure uses the dotted line × to indicate, and will not be explained below). The current direction of the external power signal is as follows Figure 3 The direction indicated by the arrow does not pass through the overvoltage protection diode D1 and the undervoltage protection diode D2, but flows to the pixel driving circuit 01. Figure 3 The simulation result detected at the PR1 probe position is also schematically shown, wherein the simulated current is 1.46 mA < 10 mA.

[0101] It should be noted that the reverse cutoff characteristic of a diode means that if the positive electrode voltage of the diode is less than the negative electrode voltage, the diode is in a cutoff state, that is, not conducting.

[0102] Example, reference Figure 4 , the voltage of the external power signal is -2V (ie, TEST_V1 = -2V), which is in the undervoltage power supply state. Based on this, it can be seen that, because -2V < 0 < 7.75V, the overvoltage protection diode D1 is reversely cut off, while the undervoltage protection diode D2 is forward-conducting. The current direction of the external power signal is as follows: Figure 4 The direction indicated by the arrow does not pass through the overvoltage protection diode D1, but flows into the external power supply 10 through the second power supply terminal V2 (ie, the ground terminal GND=0) and the undervoltage protection diode D2, and does not flow to the pixel driving circuit 10, thereby playing the role of undervoltage protection. Figure 4The simulation results detected at the PR1 probe position are also schematically shown, and the simulation results detected at the PR2 probe position are also shown. Among them, the current simulated at the PR1 probe position is -33.9μA<10mA. Based on the simulation results of the PR2 probe position, it can be seen that the overcurrent caused by undervoltage can occur in external devices other than the display panel.

[0103] Example, reference Figure 5 , the voltage of the external power signal is 16V (ie, TEST_V1 = 16V), which is in the overvoltage power supply state. Based on this, it can be seen that since 0 < 7.75V < 16V, the overvoltage protection diode D1 is forward-conducting, while the undervoltage protection diode D2 is reverse-cutoff. The current direction of the external power signal is as follows: Figure 5 The direction indicated by the arrow does not pass through the undervoltage protection diode D2 but flows into the first power supply terminal V1 through the overvoltage protection diode D1, such as flowing into the external electrical appliance coupled to the first power supply terminal V1, but does not flow to the pixel driving circuit 10, thereby playing the role of overvoltage protection. Figure 5 The simulation result detected at the PR1 probe position is also schematically shown, wherein the current simulated at the PR1 probe position is 336 μA<10 mA.

[0104] Figure 6 FIG. 1 is a schematic diagram of the structure of another display panel provided by an embodiment of the present disclosure. Figure 6 As shown, the control subcircuit 022 of the embodiment of the present disclosure may include: a frame measurement unit 0221 and a primary feedback unit 0222 .

[0105] The two ends of the frame measuring unit 0221 can be coupled to the first pole of the external power supply 10 and the input end of the switch sub-circuit 023 respectively, that is, the frame measuring unit 0221 can be connected in series between the positive pole of the external power supply 10 and the input end of the switch sub-circuit 023. The frame measuring unit 0221 can be used to measure the current of the external power signal.

[0106] The primary feedback unit 0222 can be respectively coupled to the two ends of the frame measurement unit 0221, the first power supply terminal V1, the second power supply terminal V2, and the control end of the switch sub-circuit 023. The primary feedback unit 0222 can be used to generate a switch control signal based on the current of the first power supply signal, the second power supply signal, and the external power supply signal, and transmit the switch control signal to the control end of the switch sub-circuit 023.

[0107] Figure 7 FIG. 1 is a schematic diagram of the structure of another display panel provided by an embodiment of the present disclosure. Figure 7 As shown, in one embodiment, the control subcircuit 022 may further include: a switch unit 0223 .

[0108] The switch unit 0223 can be coupled to the enable power terminal EN, the primary feedback unit 0222 and the control terminal of the switch sub-circuit 023 respectively, that is, the switch unit 0223 can be coupled between the primary feedback unit 0222 and the switch sub-circuit 023. The switch unit 0223 can be used to receive a switch signal, and can be used to control the control terminal of the switch sub-circuit 023 to be connected to the enable power terminal EN based on the switch signal, or to control the control terminal of the switch sub-circuit 023 to be connected to the primary feedback unit 0222. On this basis, the switch sub-circuit 023 can also be used to control the external power supply 10 to be disconnected from the pixel driving circuit 01 based on the enable power signal provided by the enable power terminal EN.

[0109] For example, as described in the above embodiment, the enable power signal can also be called a shutdown control signal. On the basis that the switch sub-circuit 023 includes a P-type transistor, the potential of the enable power signal can be a high potential (e.g., 7V). It should be noted that the enable power terminal EN can also be coupled to an external electrical appliance other than the display panel to receive the enable power signal. Also, since the enable power terminal EN is coupled to the overcurrent control part, the enable power terminal EN can also be called an overcurrent protection enable pin.

[0110] Optionally, the display panel may further include a switch control circuit for coupling with the switch unit 0223 and providing a switch signal to the switch unit 0223. Figure 7 Not shown. And, taking the execution of the OTP action as an example, before entering the OTP action, a switch signal for controlling the conduction between the control end of the switch subcircuit 023 and the enable power supply end EN is provided to the switch unit 0223, so that the switch subcircuit 023 disconnects the coupling between the external power supply 10 and the pixel driving circuit 01 at this time; and, when entering the OTP action, a switch signal for controlling the conduction between the control end of the switch subcircuit 023 and the primary feedback unit 0222 is provided to the switch unit 0223, so that the switch subcircuit 023 controls the on-off between the external power supply 10 and the pixel driving circuit 01 based on the switch control signal fed back by the primary feedback unit 0222. By setting the switch unit 0223, the secondary control of the switch subcircuit 023 can be realized, which belongs to a secondary protection design.

[0111] Figure 8 FIG. 1 is a schematic diagram of the structure of another display panel provided by an embodiment of the present disclosure. Figure 8 As shown, in another embodiment, the control subcircuit 022 may further include: a secondary feedback unit 0224 .

[0112] Among them, the secondary feedback unit 0224 can be coupled between the primary feedback unit 0222 and the control end of the switch sub-circuit 023, and can also be coupled to the first power supply end V1, the second power supply end V2 and the third power supply end V3 respectively. The secondary feedback unit 0224 can be used to perform voltage reduction processing on the switch control signal generated by the primary feedback unit 0222 based on the external power supply signal, the first power supply signal, the second power supply signal and the third power supply signal provided by the third power supply end V3, and then transmit it to the control end of the switch sub-circuit 023. That is, the secondary feedback unit 0224 can redefine the switch control signal generated by the primary feedback unit 0222. Through the voltage reduction processing, the start control signal can be transmitted to the switch sub-circuit 023 in time when there is no overcurrent, so that the switch sub-circuit 023 can reliably conduct the external power supply 10 and the pixel driving circuit 01, improve the correctness of burning such as OTP action, and belong to a design of indirect threshold control of current.

[0113] Optionally, the third power terminal V3 may also be used to couple with the first pole of the external power source 10, that is, the third power signal may be an external power signal, which simplifies the design of the power terminal and saves costs.

[0114] Optional, in Figure 8 Based on the reference Fig. 9 It can be seen from the further display panel shown that the secondary feedback unit 0224 may include: a threshold setting subunit 02241 and a threshold control subunit 02242 .

[0115] The threshold setting subunit 02241 may be respectively coupled to the second power supply terminal V2, the third power supply terminal V3 and the threshold control subunit 02242. The threshold setting subunit 02241 may be used to transmit a reference power supply signal to the threshold control subunit 02242 based on the second power supply signal and the external power supply signal, and the potential of the reference power supply signal may be greater than the potential of the switch control signal.

[0116] The threshold control subunit 02242 may also be respectively coupled to the first power supply terminal V1, the second power supply terminal V2, the primary feedback unit 0222, and the control terminal of the switch subcircuit 023. The threshold control subunit 02242 may be used to perform voltage reduction processing on the switch control signal generated by the primary feedback unit 0222 based on the first power supply signal, the second power supply signal, and the reference power supply signal, and then transmit the signal to the control terminal of the switch subcircuit 023.

[0117] Optional, with Figure 7 Take the structure shown as an example, Fig.10 A schematic diagram of the structure of another display panel is shown. Fig. 9 Take the structure shown as an example, Fig.11 A schematic structural diagram of another display panel is shown.

[0118] refer to Fig.10 and Fig.11 It can be seen that the frame measurement unit 0221 may include: a sampling resistor R01.

[0119] The first end of the sampling resistor R01 can be coupled to the first electrode of the external power source 10, and the second end of the sampling resistor R01 can be coupled to the input end of the switch sub-circuit 023. That is, in combination with the above embodiment, the sampling resistor R01 can be set to measure the current flowing through the first connection line, that is, the current of the external power signal. The voltage difference across the sampling resistor R01 can indicate the magnitude of the current.

[0120] Optionally, the resistance of the sampling resistor R01 may be relatively small to ensure reliable current measurement. For example, the resistance of the sampling resistor R01 shown in the figure may be 0.02 ohms (Ω).

[0121] Continue to refer Fig.10 and Fig.11 It can be seen that the first-level feedback unit 0222 may include: a first differential amplifier U1 and a first resistor R1. For example, the resistance value of the first resistor R1 may be 100Ω.

[0122] The positive input terminal (+) and the negative input terminal (-) of the first differential amplifier U1 can be coupled to the two ends of the frame detection unit 0221, respectively, as shown in FIG. Fig.10 As shown, based on the detection unit 0221 being a sampling resistor R01, the positive input terminal (+) and the negative input terminal (-) of the first differential amplifier U1 can be coupled to the first terminal and the second terminal of the sampling resistor R01 respectively. The power supply terminal of the first differential amplifier U1 can be coupled to the first power supply terminal V1 and the second power supply terminal V2 respectively, the output terminal of the first differential amplifier U1 can be coupled to the first terminal of the first resistor R1, and the second terminal of the first resistor R1 can be coupled to the control terminal of the switch sub-circuit 023. Figure 7 The structure shown also includes a switch unit 0223, so Fig.10 and Fig.11 The second end of the first resistor R1 is not shown to be coupled to the control end of the switch sub-circuit 023. Based on this, the first differential amplifier U1 can amplify the voltage difference across the sampling resistor R01 based on the first power signal and the second power signal to generate a switch control signal.

[0123] Continue to refer Fig.10 It can be seen that in Figure 7 In one embodiment shown, the switch unit 0223 included therein may include: a single-pole double-throw switch K1.

[0124] The static contact of the SPDT switch K1 can be coupled to the control end of the switch subcircuit 023, and the two moving contacts of the SPDT switch K1 can be coupled to the primary feedback unit 0222 and the enable power supply end EN, respectively. Here, it can refer to coupling to the second end of the first resistor R1 in the primary feedback unit 0222.

[0125] Of course, in some other embodiments, the switch unit 0223 may also be a switch transistor, such as a P-type metal-oxide-semiconductor (MOS) field effect transistor, i.e., a PMOS transistor, or an NMOS transistor. The disclosed embodiment does not limit the structure of the switch unit 0223.

[0126] Continue to refer Fig.11 It can be seen that in Fig. 9 In another embodiment shown, the threshold setting subunit 02241 may include: a plurality of voltage-dividing resistors coupled to each other, and at least one of the voltage-dividing resistors may be a variable resistor.

[0127] A plurality of voltage-dividing resistors may also be coupled to the threshold control subunit 02242, and a portion of the voltage-dividing resistors may be coupled to the second power supply terminal V2, and another portion of the voltage-dividing resistors may be coupled to the third power supply terminal V3. For example, when the third power supply terminal V3 is used to couple to the first pole of the external power supply 10, it may be considered that the other portion of the voltage-dividing resistors is coupled to the first pole of the external power supply 10. The plurality of voltage-dividing resistors may be used to perform voltage-dividing processing based on the third power supply signal and the second power supply signal to generate a reference power supply signal greater than the potential of the switch control signal. Accordingly, by setting at least one of the voltage-dividing resistors as a variable resistor, flexible adjustment of the voltage-dividing capability may be achieved, and the resistance values ​​of the various voltage-dividing resistors may be flexibly designed based on the external power supply signal provided by the external power supply 10 and the power supply signal required by the pixel driving circuit 01 before the product leaves the factory, thereby ensuring a reliable secondary redefinition of the switch control signal.

[0128] For example, Fig.11 The threshold setting subunit 02241 shown includes: a first voltage-dividing resistor R11 and a second voltage-dividing resistor R12, and the second voltage-dividing resistor R12 shown is a variable resistor. And the resistance values ​​of the first voltage-dividing resistor R11 and the second voltage-dividing resistor R12 are both 2 kilo-ohms (KΩ).

[0129] The first end of the first voltage-dividing resistor R11 may be coupled to the third power supply terminal V3 (eg, the positive electrode of the external power supply 10 ), and the second end of the first voltage-dividing resistor R11 may be coupled to the threshold control subunit 02242 .

[0130] A first end of the second voltage-dividing resistor R12 may be coupled to the second power supply terminal V2 , and a second end of the second voltage-dividing resistor R12 may be coupled to the threshold control subunit 02242 .

[0131] Furthermore, the second end of the first voltage-dividing resistor R11 may be coupled to the second end of the first voltage-dividing resistor R11.

[0132] Continue to refer Fig.11 It can be seen that the threshold control subunit 02242 may include: a second differential amplifier U2 and a second resistor R2. For example, the resistance value of the second resistor R2 may be 100Ω.

[0133] Among them, the positive input terminal (+) of the second differential amplifier U2 can be coupled to the threshold setting subunit 02241, the negative input terminal (-) of the second differential amplifier U2 can be coupled to the first-level feedback unit 0222, the power supply terminal of the second differential amplifier U2 can be coupled to the first power supply terminal V1 and the second power supply terminal V2 respectively, the output terminal of the second differential amplifier U2 can be coupled to the first end of the second resistor R2, and the second end of the second resistor R2 can be coupled to the control end of the switch subcircuit 023.

[0134] Optionally, in combination with the above embodiment, it can be known that the positive input terminal (+) of the second differential amplifier U2 can be coupled to the second end of the first voltage-dividing resistor R11 and the second end of the second voltage-dividing resistor R12, and the negative input terminal (-) of the second differential amplifier U2 can be coupled to the second end of the first resistor R1 included in the first-stage feedback unit 0222. And on this basis, it can be known that the second differential amplifier U2 can amplify the voltage difference between the reference power supply signal and the switch control signal based on the first power supply signal and the second power supply signal to redefine the switch control signal.

[0135] Continue to refer Fig.10 and Fig.11 It can also be seen that the switch sub-circuit 023 may include: a switch transistor Q1 and a third resistor R3.

[0136] Among them, the gate of the switching transistor Q1 can be coupled to the control sub-circuit 022 as the control end of the switching sub-circuit 023, the first pole of the switching transistor Q1 can be coupled to the first pole of the external power supply 10 through the control sub-circuit 022 as the input end of the switching sub-circuit 023, and the second pole of the switching transistor Q1 can be coupled to the pixel driving circuit 01 as the output end of the switching sub-circuit 023.

[0137] A first end of the third resistor R3 may be coupled to the gate of the switch transistor Q1 , and a second end of the third resistor R3 may be coupled to the first electrode of the switch transistor Q1 .

[0138] Optional, for Fig.10For the structure corresponding to the embodiment shown, the gate of the switch transistor Q1 may be coupled to the static contact of the single-pole double-throw switch K1 included in the switch unit 0223 in the control subcircuit 022. Fig.11 For the structure corresponding to another embodiment shown, the gate of the switch transistor Q1 may be coupled to the second end of the second resistor R2 included in the threshold control subunit 02242 in the control subcircuit 022. Fig.10 and Fig.11 In the embodiment, the first electrode of the switch transistor Q1 is coupled to the second end of the sampling resistor R01 in the control sub-circuit 022 .

[0139] In the embodiment of the present disclosure, the switching transistor Q1 can be turned on based on a switching control signal of a first potential to connect the external power supply 10 to the pixel driving circuit 01, and the switching transistor Q1 can be turned off based on a switching control signal of a second potential to control the external power supply 10 to be disconnected from the pixel driving circuit 01.

[0140] The third resistor R3 is set so that before the external power source 10 is connected, for example, before the OTP action is performed, the single-pole double-throw switch K1 included in the switch unit 0223 is coupled to the enable power supply terminal EN and is powered on, the switch transistor Q1 is ensured to be reliably in the off state to avoid damage caused by static electricity (which may be static electricity generated by friction during transportation). The resistance value of the third resistor R3 can be set relatively large, such as 1 megohm (MΩ).

[0141] Optionally, the switch transistor Q1 can be a PMOS tube, and accordingly, based on the working characteristics of the PMOS tube, the switch control signal of the first potential (i.e., the potential of the shutdown control signal) can be a high potential, and the switch control signal of the second potential (i.e., the potential of the turn-on control signal) can be a low potential. Of course, in some other embodiments, the switch transistor Q1 can also be an NMOS tube, and accordingly, based on the working characteristics of the NMOS tube, the switch control signal of the first potential (i.e., the potential of the turn-off control signal) can be a low potential, and the switch control signal of the second potential (i.e., the potential of the turn-on control signal) can be a high potential. The embodiment of the present disclosure is described by taking the switch transistor Q1 as a PMOS tube as an example. In addition, of the first pole and the second pole of the switch transistor Q1, one pole can be a source and the other pole can be a drain.

[0142] It should be noted that Fig.10 and Fig.11 , the first power supply terminal V1 is also used as the VCC power supply terminal, and the first power supply signal provided is 7.75V, and the second power supply terminal V2 shown is the ground terminal GND provided with a second power supply signal of 0. And, Fig.10 The potential of the enable power signal provided by the enable power terminal EN is shown to be 7V. Fig.11 The third power terminal V3 shown is coupled to the positive pole of the external power source 10 .

[0143] For example, the voltage range required for normal operation of the pixel driving circuit 10 is 7.25V to 7.75V, and the current required for normal operation is 0 to 10mA. Fig.10 On the basis of Fig.12 and Fig.13 Two simulation diagrams are shown respectively when the external power supply 10 works normally and when the external power supply 10 has an overcurrent. In addition, it should be noted that Figures 10 to 13 In both cases, a constant current source I1 is used to simulate an external power source 10.

[0144] Example, reference Fig.12 , the voltage of the external power signal shown is 7.25V, and the current of the external power signal shown is 1mA (0.01A), that is, the normal 7.25V&1mA external power signal is used for power supply. On this basis, after the current passes through the sampling resistor R01, it can be collected and fed back through the first differential amplifier U1 and generate a second potential switch control signal (i.e., a turn-on control signal) transmitted to the gate of the switching transistor Q1, so that the switching transistor Q1 is turned on, and the connection between the external power supply 10 and the pixel driving circuit 01 is equivalent to Fig.12 In the path shown, the 1 mA current can enter through the first electrode (eg, source) of the switch transistor Q1 and be output through the second electrode (eg, drain) of the switch transistor Q1 to the pixel driving circuit 01. When applied to the OTP action, normal burning is completed at this time. Fig.12 The simulation result detected at the PR1 probe position is also schematically shown, wherein the simulated current is 775 μA.

[0145] Example, reference Fig.13 , the voltage of the external power signal shown is 7.25V, and the current of the external power signal shown is 120mA (0.120A), that is, an abnormal 7.25V&120mA external power signal is used for power supply. On this basis, after the current passes through the sampling resistor R01, it can be collected and fed back through the first differential amplifier U1 to generate a first potential switch control signal (i.e., a shutdown control signal) and transmitted to the gate of the switching transistor Q1. At this time, the switching transistor Q1 is turned off, and the connection between the external power supply 10 and the pixel driving circuit 01 is equivalent to Fig.12 As shown in the open circuit, the excessive current of 120mA cannot enter through the first pole (e.g., source) of the switching transistor Q1, and further cannot be output to the pixel driving circuit 01 through the second pole (e.g., drain) of the switching transistor Q1, that is, it cannot enter the interior of the pixel driving circuit 01, thus achieving overcurrent protection. Fig.13The simulation result detected at the PR1 probe position is also schematically shown, wherein the simulated current is 4.81 μA.

[0146] Optionally, as described in the above embodiment, the pixel driving circuit 01 may include: a one-time programming (OTP) module. The protection circuit 02 may be coupled to the one-time programming (OTP) module and used to transmit the received external power signal to the one-time programming (OTP) module. The protection circuit 02 provided in the embodiment of the present disclosure can prevent the internal structure of the OTP module from being burned due to an abnormal external power signal provided by the external power supply 10 during the OTP action, thereby achieving reliable protection of the OTP module.

[0147] Example, reference Figures 10 to 13 It can be seen that the fourth resistor R4 is used to represent the load in the pixel driving circuit 01 , such as the load in the OTP module in the pixel driving circuit 01 , which is marked as OTP_PWR in.

[0148] Optionally, based on the above embodiment, Fig.10 For example, Fig.14 A circuit diagram is also shown. Fig.11 For example, Fig.15 A circuit block diagram is shown.

[0149] refer to Fig.14 and Fig.15 It can be seen that the pixel circuit in the display panel recorded in the embodiment of the present disclosure may include: an overvoltage and undervoltage protection part (i.e., the protection subcircuit 021), a current frame measurement part (i.e., the frame measurement unit 0221 in the control subcircuit 022), a current feedback part (i.e., the first-level feedback unit 0222 in the control subcircuit 022), and an overcurrent control part (i.e., the switch subcircuit 023). In addition, Fig.15 The display panel shown may also include a current threshold setting part (ie, threshold setting subunit 02241) and a current threshold control part (ie, threshold control subunit 02242).

[0150] Among them, the overvoltage and undervoltage protection part can be used to couple with the external power supply 10 (also known as the power supply device), and can be coupled with the current feedback part. The current frame measurement part can be coupled with the current feedback part. The current feedback part can be coupled with the overcurrent control part, and when including the current threshold control part, the current feedback part can also be coupled with the current threshold control part. The current threshold setting part can be coupled with the current threshold control part. The current threshold control part can also be coupled with the overcurrent control part. The overcurrent control part can be further coupled with the pixel driving circuit 01, such as Fig.14 and Fig.15The OTP module shown is coupled. The specific structure and working principle of each part can be referred to the above embodiment, and will not be repeated here.

[0151] Optional, including OTP module as an example, Fig.16 Also shown is an overall structural block diagram of a circuit in a display panel in the related art. Fig.17 The figure shows a block diagram of the overall structure of the circuit in the display panel according to the embodiment of the present disclosure. Fig.16 and Fig.17 It can be seen that, compared with the related art, the OTP module in the embodiment of the present disclosure can be indirectly coupled to an external power supply (marked as OTP_PWR) through an OTP protection unit (i.e., the protection circuit 02 recorded in the above embodiment), thereby achieving protection of the OTP module.

[0152] also, Fig.16 and Fig.17 Other structures in some circuits are also shown, such as the power management circuit MIPI, the voltage load MIPI Voltage Gen of the power management circuit, the data path Data Path, the register encoder Register Decode, the timing controller Timing Control, the gamma Gamma circuit, the source driver circuit Source Driver, the gate driver circuit Gate Driver, the oscillator OSC, the power regulator VDD Regulator and Regulator, and the pixel driver circuit PixelCircuits. The coupling relationship can be referred to the attached figure, and will not be described in detail here.

[0153] When the display panel is a silicon-based OLED display panel, Fig.16 and Fig.17 The circuit composed of the parts shown can be called a silicon-based IC, and the OTP module is a part of the silicon-based IC. On the basis of protecting the OTP module through the protection circuit 02, the silicon-based IC can be further protected to avoid damage to the silicon-based IC.

[0154] In summary, the embodiment of the present disclosure provides a display panel, which includes a pixel driving circuit and a protection circuit that indirectly couples the pixel driving circuit to an external power supply. The protection circuit includes a protection subcircuit, a control subcircuit and a switch subcircuit. The protection subcircuit can control the flow direction of the external power signal provided by the external power supply based on the received first power signal and the second power signal. In this way, the first power signal and the second power signal can be flexibly set so that when there is no overvoltage and no undervoltage, the external power signal will further flow to the pixel driving circuit, thereby realizing overvoltage protection and undervoltage protection of the pixel driving circuit. The control subcircuit can transmit a switch control signal to the switch subcircuit based on the first power signal, the second power signal and the external power signal, so that the switch subcircuit controls the on and off of the external power supply and the pixel driving circuit. In this way, the first power signal and the second power signal can be flexibly set so that when there is no overcurrent pressure, the external power supply and the pixel driving circuit are controlled to be turned on, thereby causing the external power signal to be transmitted to the pixel driving circuit, thereby realizing overcurrent protection of the pixel driving circuit. Avoid damaging the pixel driving circuit.

[0155] Fig.18 is a schematic diagram of the structure of a display device provided by an embodiment of the present disclosure. Fig.18 As shown, the display device includes: a display panel M1 as described in the above embodiment, and a plurality of pixels P1 located on the display panel M1. The pixel driving circuit 01 in the display panel M1 can be coupled to the plurality of pixels P1 and used to drive the plurality of pixels P1 to emit light, so that the display panel M1 can display a picture.

[0156] Optionally, as described in the above embodiment, the display device may be a silicon-based organic light emitting diode (OLED) display device. Accordingly, the pixel P1 may be a silicon-based OLED.

[0157] Optionally, the display device described in the embodiments of the present disclosure may be any product or component with a display function, such as a mobile phone, a tablet computer, a flexible display device, a television set, and a monitor.

[0158] The terms used in the embodiments of the present disclosure are only used to explain the embodiments of the present disclosure, and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be the common meanings understood by people with ordinary skills in the field to which the present disclosure belongs.

[0159] For example, in the embodiments of the present disclosure, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. The term "plurality" refers to two or more, unless otherwise clearly defined.

[0160] Likewise, the words “a” or “an” and the like do not denote a limitation of quantity, but rather denote the presence of at least one.

[0161] Words such as “include” or “comprising” and the like mean that the elements or objects preceding “include” or “comprising” include the elements or objects listed after “include” or “comprising” and their equivalents, and do not exclude other elements or objects.

[0162] “Up”, “down”, “left” or “right” etc. are only used to indicate relative position relationship. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0163] "And / or" indicates that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship.

[0164] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A display panel, characterized in that: The display panel includes: a pixel driving circuit and a protection circuit, wherein the protection circuit is coupled to the pixel driving circuit and is also used to couple to an external power source, receive an external power signal provided by the external power source and transmit it to the pixel driving circuit; Wherein, the external power supply has a first pole and a second pole; the protection circuit comprises: a protection subcircuit, a control subcircuit and a switch subcircuit; The protection subcircuit is coupled to the first power supply terminal and the second power supply terminal respectively, and is also used to couple to both the first pole and the second pole of the external power supply, and the second pole of the external power supply is also coupled to the second power supply terminal, and the protection subcircuit is used to control the flow direction of the external power supply signal based on the first power supply signal provided by the first power supply terminal, the second power supply signal provided by the second power supply terminal, and the external power supply signal; The control subcircuit is coupled to the first power supply terminal, the second power supply terminal and the control terminal of the switch subcircuit respectively, and is also used to couple to the first pole of the external power supply, and the control subcircuit is used to transmit a switch control signal to the control terminal of the switch subcircuit based on the first power supply signal, the second power supply signal and the external power supply signal; The input end of the switch subcircuit is used to couple with the first pole of the external power supply through the control subcircuit, the output end of the switch subcircuit is coupled with the pixel driving circuit, and the switch subcircuit is used to control the on and off of the external power supply and the pixel driving circuit based on the switch control signal; Wherein, the control subcircuit includes: a frame measurement unit and a primary feedback unit; Two ends of the frame measuring unit are respectively coupled to the first pole of the external power supply and the input end of the switch subcircuit, and the frame measuring unit is used to frame measure the current of the external power supply signal; The first-level feedback unit is respectively coupled to the two ends of the frame measurement unit, the first power supply end, the second power supply end and the control end of the switch sub-circuit, and the first-level feedback unit is used to generate a switch control signal based on the current of the first power supply signal, the second power supply signal and the external power supply signal, and transmit the switch control signal to the control end of the switch sub-circuit.

2. The display panel according to claim 1, characterized in that: The voltage of the first power signal is greater than the voltage of the second power signal, and the voltage of the first power signal is not less than the upper limit value of the voltage required for the normal operation of the pixel driving circuit, and the voltage of the first power signal is not greater than the lower limit value of the voltage required for the normal operation of the pixel driving circuit; The protection subcircuit is used for controlling the external power signal to be output to the pixel driving circuit if the voltage of the external power signal is within the range of the voltage required for normal operation, controlling the external power signal to be output from the first power supply terminal if the voltage of the external power signal is not within the range of the voltage required for normal operation and is greater than the voltage of the first power signal, and controlling the external power signal to be output to the external power supply if the voltage of the external power signal is not within the range of the voltage required for normal operation and is less than the voltage of the second power signal; The control subcircuit is used for transmitting a switch control signal of a first potential to the control end of the switch subcircuit based on the first power signal, the second power signal and the external power signal if the current of the external power signal is not within the current range required for the normal operation of the pixel driving circuit, and transmitting a switch control signal of a second potential to the control end of the switch subcircuit based on the first power signal, the second power signal and the external power signal if the current of the external power signal is within the current range required for the normal operation of the pixel driving circuit; The switch subcircuit is used to control the external power supply to be disconnected from the pixel driving circuit based on the switch control signal of the first potential, and to control the external power supply to be connected to the pixel driving circuit based on the switch control signal of the second potential.

3. The display panel according to claim 1, characterized in that: The protection subcircuit includes: an overvoltage protection diode and an undervoltage protection diode; Wherein, the anode of the overvoltage protection diode is coupled to the first electrode of the external power supply, and the cathode of the overvoltage protection diode is coupled to the first power supply terminal; The anode of the undervoltage protection diode is coupled to the second electrode of the external power supply and is also coupled to the second power supply terminal. The anode of the overvoltage protection diode is coupled to the first electrode of the external power supply.

4. The display panel according to any one of claims 1 to 3, characterized in that: The frame measurement unit comprises: a sampling resistor; A first end of the sampling resistor is coupled to a first electrode of the external power source, and a second end of the sampling resistor is coupled to an input end of the switch sub-circuit.

5. The display panel according to any one of claims 1 to 3, characterized in that: The first-level feedback unit includes: a first differential amplifier and a first resistor; Among them, the positive input terminal and the negative input terminal of the first differential amplifier are respectively coupled to the two ends of the frame measurement unit, the power supply terminal of the first differential amplifier is respectively coupled to the first power supply terminal and the second power supply terminal, the output terminal of the first differential amplifier is coupled to the first end of the first resistor, and the second end of the first resistor is coupled to the control end of the switch sub-circuit.

6. The display panel according to any one of claims 1 to 3, characterized in that: The control subcircuit further includes: a switch unit; The switch unit is coupled to the enable power supply terminal, the first-level feedback unit and the control terminal of the switch sub-circuit respectively. The switch unit is used to receive a switch signal and to control the control terminal of the switch sub-circuit to be connected with the enable power supply terminal based on the switch signal, or to control the control terminal of the switch sub-circuit to be connected with the first-level feedback unit. The switch sub-circuit is also used to control the external power supply to be disconnected from the pixel driving circuit based on the enable power supply signal provided by the enable power supply terminal.

7. The display panel according to claim 6, characterized in that: The switch unit comprises: a single-pole double-throw switch; The static contact of the single-pole double-throw switch is coupled to the control end of the switch sub-circuit, and the two moving contacts of the single-pole double-throw switch are coupled to the primary feedback unit and the enabling power supply end respectively.

8. The display panel according to any one of claims 1 to 3, characterized in that: The control subcircuit further includes: a secondary feedback unit; The secondary feedback unit is coupled between the primary feedback unit and the control end of the switch sub-circuit, and is also coupled to the first power supply end, the second power supply end and the third power supply end respectively. The secondary feedback unit is used to step down the switch control signal generated by the primary feedback unit based on the external power supply signal, the first power supply signal, the second power supply signal and the third power supply signal provided by the third power supply end, and transmit it to the control end of the switch sub-circuit.

9. The display panel according to claim 8, characterized in that: The secondary feedback unit includes: a threshold setting subunit and a threshold control subunit; The threshold setting subunit is coupled to the second power supply terminal, the third power supply terminal and the threshold control subunit respectively, and the threshold setting subunit is used to transmit a reference power supply signal to the threshold control subunit based on the second power supply signal and the external power supply signal, wherein the potential of the reference power supply signal is greater than the potential of the switch control signal; The threshold control subunit is also coupled to the first power supply end, the second power supply end, the first-level feedback unit and the control end of the switch subcircuit respectively. The threshold control subunit is used to step down the switch control signal generated by the first-level feedback unit based on the first power supply signal, the second power supply signal and the reference power supply signal, and transmit it to the control end of the switch subcircuit.

10. The display panel according to claim 9, characterized in that: The threshold setting subunit includes: a plurality of voltage-dividing resistors coupled to each other, and at least one of the voltage-dividing resistors is a variable resistor; The plurality of voltage-dividing resistors are also coupled to the threshold control subunit, and a portion of the voltage-dividing resistors are coupled to the second power supply terminal, and another portion of the voltage-dividing resistors are coupled to the third power supply terminal.

11. The display panel according to claim 10, characterized in that: The threshold setting subunit includes: a first voltage-dividing resistor and a second voltage-dividing resistor, and the second voltage-dividing resistor is a variable resistor; The first end of the first voltage-dividing resistor is coupled to the third power supply end, the second end of the first voltage-dividing resistor is coupled to the threshold control subunit, and the third power supply end is also used to couple to the first pole of the external power supply, and the third power supply signal is the external power supply signal; A first end of the second voltage-dividing resistor is coupled to the second power supply end, and a second end of the second voltage-dividing resistor is coupled to the threshold control subunit; Furthermore, the second end of the first voltage-dividing resistor is coupled to the second end of the first voltage-dividing resistor.

12. The display panel according to claim 9, characterized in that: The threshold control subunit includes: a second differential amplifier and a second resistor; Among them, the positive input terminal of the second differential amplifier is coupled to the threshold setting subunit, the negative input terminal of the second differential amplifier is coupled to the first-level feedback unit, the power supply terminal of the second differential amplifier is coupled to the first power supply terminal and the second power supply terminal respectively, the output terminal of the second differential amplifier is coupled to the first end of the second resistor, and the second end of the second resistor is coupled to the control end of the switch subcircuit.

13. The display panel according to any one of claims 1 to 3, characterized in that: The switch subcircuit comprises: a switch transistor and a third resistor; The gate of the switch transistor is coupled to the control subcircuit as a control terminal of the switch subcircuit, the first electrode of the switch transistor is coupled to the first electrode of the external power supply through the control subcircuit as an input terminal of the switch subcircuit, and the second electrode of the switch transistor is coupled to the pixel driving circuit as an output terminal of the switch subcircuit; A first end of the third resistor is coupled to the gate of the switch transistor, and a second end of the third resistor is coupled to the first electrode of the switch transistor.

14. The display panel according to any one of claims 1 to 3, characterized in that: The pixel driving circuit comprises: a one-time programming module; The protection circuit is coupled to the one-time programming module and is used to transmit the received external power supply signal to the one-time programming module.

15. A display device, characterized in that: The display device comprises: a display panel according to any one of claims 1 to 14, and a plurality of pixels located on the display panel; The pixel driving circuit in the display panel is coupled to the plurality of pixels and is used to drive the plurality of pixels to emit light.

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