Power supply control circuit, power supply control method and display device

Abstract

The present invention provides a power control circuit, a power control method and a display device. The power control circuit is applied to a display device, wherein the display device includes a display panel and a power management chip, wherein the power management chip includes an analog positive power supply terminal; the analog positive power supply terminal is used to provide an analog positive voltage for the display panel; the power control circuit includes a voltage conversion circuit and a control circuit; the voltage conversion circuit is electrically connected to the analog positive power supply terminal, and is used to convert the analog positive power supply to obtain an output detection voltage; the control circuit is electrically connected to the voltage conversion circuit and the power management chip, respectively, and is used to control whether the power management chip provides an analog positive power supply to the analog positive power supply terminal according to the output detection voltage. The present invention can prevent the power supply voltage detection line from being burned.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a power control circuit, a power control method and a display device. Background Art

[0002] In the related art, because the terminal providing the analog positive power supply is close to the terminal providing the digital power supply in the connector between the display device and the mobile phone motherboard, a short circuit occurs between the terminal providing the analog positive power supply and the terminal providing the digital power supply during production and testing, resulting in a large current and burning the wiring in the display panel. Summary of the invention

[0003] The main purpose of the present invention is to provide a power control circuit, a power control method and a display device to solve the problem of wiring burns in the display panel in the prior art.

[0004] In one aspect, an embodiment of the present invention provides a power control circuit, which is applied to a display device, wherein the display device includes a display panel and a power management chip, wherein the power management chip includes an analog positive power supply terminal; the analog positive power supply terminal is used to provide an analog positive voltage for the display panel; the power control circuit includes a voltage conversion circuit and a control circuit;

[0005] The voltage conversion circuit is electrically connected to the analog positive power supply terminal and is used to convert the analog positive power supply to obtain an output detection voltage;

[0006] The control circuit is electrically connected to the voltage conversion circuit and the power management chip respectively, and is used to control whether the power management chip provides analog positive power to the analog positive power supply terminal according to the output detection voltage.

[0007] Optionally, the voltage conversion circuit includes a first resistance circuit, a switch circuit and a second resistance circuit;

[0008] A first end of the first resistance circuit is electrically connected to the analog positive power supply terminal, and a second end of the first resistance circuit is electrically connected to the control terminal of the switch circuit;

[0009] The first end of the switch circuit is electrically connected to the control voltage end, the second end of the switch circuit is electrically connected to the output detection voltage end, and the switch circuit is used to control the connection or disconnection between the control voltage end and the output detection voltage end under the control of the potential of the control end;

[0010] The output detection voltage terminal is electrically connected to the first voltage terminal through the second resistance circuit;

[0011] The control voltage terminal is used to provide a control voltage, and the output detection voltage terminal is used to provide an output detection voltage.

[0012] Optionally, the switching circuit includes a switching transistor;

[0013] The control electrode of the switch transistor is electrically connected to the second end of the first resistance circuit, the first electrode of the switch transistor is electrically connected to the control voltage end, and the second electrode of the switch transistor is electrically connected to the output detection voltage end.

[0014] Optionally, the switching transistor is an n-type transistor.

[0015] Optionally, the voltage conversion circuit further includes a third resistance circuit;

[0016] A first end of the third resistance circuit is electrically connected to the control electrode of the switch transistor, and a second end of the third resistance circuit is electrically connected to the second voltage end.

[0017] Optionally, the voltage conversion circuit includes a fourth resistance circuit and a fifth resistance circuit;

[0018] A first end of the fourth resistance circuit is electrically connected to the analog positive power supply terminal, and a second end of the fourth resistance circuit is electrically connected to the output detection voltage terminal;

[0019] The first end of the fifth resistance circuit is electrically connected to the output detection voltage terminal, and the second end of the fifth resistance circuit is electrically connected to the third voltage terminal.

[0020] Optionally, the control circuit is used to compare the output detection voltage and the detection voltage threshold, and is used to control the power management chip to provide analog positive power to the analog positive power supply terminal when the output detection voltage is greater than the detection voltage threshold, and is used to control the power management chip to stop the analog positive power supply terminal from providing analog positive power when the output detection voltage is less than the detection voltage threshold.

[0021] In a second aspect, an embodiment of the present invention provides a power control method, which is applied to the above-mentioned power control circuit, and the power control method includes:

[0022] The voltage conversion circuit converts the analog positive power supply to obtain an output detection voltage;

[0023] The control circuit controls the power management chip to provide analog positive power to the analog positive power supply terminal according to the output detection voltage.

[0024] In a third aspect, an embodiment of the present invention provides a display device, comprising the above-mentioned power control circuit.

[0025] Optionally, the display device described in at least one embodiment of the present invention further includes a power supply voltage detection circuit;

[0026] The power supply voltage detection circuit is used to detect the power supply voltage of the display panel through a power supply voltage detection line; the power supply voltage detection line is electrically connected to the analog positive power supply terminal through a first diode;

[0027] An anode of the first diode is electrically connected to the power supply voltage detection line, and a cathode of the first diode is electrically connected to the analog positive power supply terminal.

[0028] The power control circuit, power control method and display device described in the embodiments of the present invention convert the analog positive power supply into an output detection voltage through a voltage conversion circuit. The control circuit controls whether the power management chip provides an analog positive voltage to the analog positive power supply terminal based on the output detection voltage to prevent the power voltage detection line from being burned. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a structural diagram of a power supply control circuit according to an embodiment of the present invention;

[0030] Figure 2 is a structural diagram of at least one embodiment of a voltage conversion circuit in a power supply control circuit according to the present invention;

[0031] Figure 3 is a circuit diagram of at least one embodiment of the voltage conversion circuit;

[0032] Figure 4 is a circuit diagram of at least one embodiment of the voltage conversion circuit;

[0033] Figure 5 Schematic diagram of the connection relationship between the power supply voltage detection line ELVDD_AVC and the analog positive power supply terminal AVDDI. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The transistors used in all embodiments of the present invention may be triodes, thin film transistors, field effect transistors or other devices with the same characteristics. In the embodiments of the present invention, in order to distinguish the two electrodes of the transistor except the control electrode, one of the electrodes is called the first electrode and the other is called the second electrode.

[0036] In actual operation, when the transistor is a triode, the control electrode may be a base, the first electrode may be a collector, and the second electrode may be an emitter; or, the control electrode may be a base, the first electrode may be an emitter, and the second electrode may be a collector.

[0037] In actual operation, when the transistor is a thin film transistor or a field effect transistor, the control electrode can be a gate, the first electrode can be a drain, and the second electrode can be a source; or, the control electrode can be a gate, the first electrode can be a source, and the second electrode can be a drain.

[0038] The power control circuit of the embodiment of the present invention is applied to a display device, wherein the display device comprises a display panel and a power management chip, wherein the power management chip comprises an analog positive power supply terminal; the analog positive power supply terminal is used to provide an analog positive voltage for the display panel; the power control circuit comprises a voltage conversion circuit and a control circuit;

[0039] The voltage conversion circuit is electrically connected to the analog positive power supply terminal and is used to convert the analog positive power supply to obtain an output detection voltage;

[0040] The control circuit is electrically connected to the voltage conversion circuit and the power management chip respectively, and is used to control whether the power management chip provides analog positive power to the analog positive power supply terminal according to the output detection voltage.

[0041] In the related art, since the terminal for providing analog positive power AVDD and the terminal for providing digital power DVDD are close to each other in the connector between the display device and the mobile phone motherboard, a short circuit occurs between the terminal for providing analog positive power AVDD and the terminal for providing digital power DVDD during production and testing, and the voltage value of AVDD is about 7V, and the voltage value of DVDD is about 1.2V. After the short circuit, the voltage value of AVDD will be instantly lowered due to the small load, resulting in a large current. Inside the IC (integrated circuit) of the display device, there is a power supply voltage detection circuit, which is used to detect the power supply voltage ELVDD used by the display panel through a power supply voltage detection line; the power supply voltage detection line is electrically connected to the analog positive power supply terminal for providing analog positive power AVDD through a first diode; after the voltage value of AVDD is lowered, the voltage value of ELVDD is greater than the voltage value of AVDD, and the first diode is turned on, resulting in a local large current in the power supply voltage detection circuit, causing the power supply voltage detection line in the PAD area (the PAD area is the wiring arrangement area of ​​the display panel) to burn. Based on this, an embodiment of the present invention provides a power control circuit, which includes a voltage conversion circuit and a control circuit. The voltage conversion circuit converts an analog positive power supply into an output detection voltage. The control circuit controls whether the power management chip provides an analog positive voltage to the analog positive power supply terminal according to the output detection voltage to prevent the power supply voltage detection line from being burned.

[0042] Specifically, when the control circuit determines that the voltage value of the analog positive power supply AVDD is less than a predetermined voltage value according to the output detection voltage, the power management chip is controlled to stop providing the analog positive voltage to the analog positive power supply terminal to prevent the power supply voltage detection line from being burned;

[0043] When the control circuit determines that the voltage value of the analog positive power supply AVDD is greater than or equal to a predetermined voltage value according to the output detection voltage, the power management chip is controlled to normally provide an analog positive voltage to the analog positive power supply terminal.

[0044] In at least one embodiment of the present invention, the predetermined voltage value may be greater than or equal to 4V and less than or equal to 6V. For example, the predetermined voltage value may be 5V, but is not limited thereto.

[0045] The power control circuit described in the embodiment of the present invention is applied to a display device, wherein the display device includes a display panel and a power management chip, wherein the power management chip includes an analog positive power supply terminal; Figure 1 As shown, the analog positive power supply terminal AVDDI is used to provide the analog positive power AVDD for the display panel; the power control circuit includes a voltage conversion circuit 11 and a control circuit 12;

[0046] The voltage conversion circuit 11 is electrically connected to the analog positive power supply terminal AVDDI, and is used to convert the analog positive power supply AVDD to obtain an output detection voltage;

[0047] The control circuit 12 is electrically connected to the voltage conversion circuit 11 and the power management chip 10 respectively, and is used to control whether the power management chip 10 provides analog positive power to the analog positive power supply terminal AVDDI according to the output detection voltage.

[0048] According to a specific implementation, the voltage conversion circuit includes a first resistance circuit, a switch circuit, and a second resistance circuit;

[0049] A first end of the first resistance circuit is electrically connected to the analog positive power supply terminal, and a second end of the first resistance circuit is electrically connected to the control terminal of the switch circuit;

[0050] The first end of the switch circuit is electrically connected to the control voltage end, the second end of the switch circuit is electrically connected to the output detection voltage end, and the switch circuit is used to control the connection or disconnection between the control voltage end and the output detection voltage end under the control of the potential of the control end;

[0051] The output detection voltage terminal is electrically connected to the first voltage terminal through the second resistance circuit;

[0052] The control voltage terminal is used to provide a control voltage, and the output detection voltage terminal is used to provide an output detection voltage.

[0053] like Figure 2 As shown, at least one embodiment of the voltage conversion circuit may include a first resistance circuit 21, a switch circuit 20, and a second resistance circuit 22;

[0054] A first end of the first resistance circuit 21 is electrically connected to the analog positive power supply terminal AVDDI, and a second end of the first resistance circuit 21 is electrically connected to the control terminal of the switch circuit 20;

[0055] The first end of the switch circuit 20 is electrically connected to the control voltage terminal VDDIO, and the second end of the switch circuit 20 is electrically connected to the output detection voltage terminal GPIO. The switch circuit 20 is used to control the connection or disconnection between the control voltage terminal VDDIO and the output detection voltage terminal GPIO under the control of the potential of its control end; the output detection voltage terminal GPIO is used to provide an output detection voltage; the control voltage terminal VDDIO is used to provide a control voltage;

[0056] The output detection voltage terminal GPIO is electrically connected to the first voltage terminal V1 through the second resistance circuit 22;

[0057] The control voltage terminal VDDIO is used to provide a control voltage, and the output detection voltage terminal GPIO is used to provide an output detection voltage.

[0058] In at least one embodiment of the present invention, the first voltage terminal V1 may be a ground terminal or a low voltage terminal, but is not limited thereto.

[0059] like Figure 2 At least one embodiment of the voltage conversion circuit shown is in operation, when AVDDI normally outputs the analog positive power supply, the switch circuit 20 controls the connection between the control voltage terminal VDDIO and the output detection voltage terminal GPIO under the control of the potential of its control terminal;

[0060] When the voltage value of the analog positive power supply provided by AVDDI drops below the voltage threshold, the switch circuit 20 controls the control voltage terminal VDDIO and the output detection voltage terminal GPIO to be disconnected under the control of the potential of its control terminal.

[0061] Optionally, the switching circuit includes a switching transistor;

[0062] The control electrode of the switch transistor is electrically connected to the second end of the first resistance circuit, the first electrode of the switch transistor is electrically connected to the control voltage end, and the second electrode of the switch transistor is electrically connected to the output detection voltage end.

[0063] In a specific implementation, the switch transistor may be an n-type transistor.

[0064] In at least one embodiment of the present invention, the voltage conversion circuit further includes a third resistance circuit;

[0065] A first end of the third resistance circuit is electrically connected to the control electrode of the switch transistor, and a second end of the third resistance circuit is electrically connected to the second voltage end.

[0066] In at least one embodiment of the present invention, the second voltage terminal may be a ground terminal or a low voltage terminal, but is not limited thereto.

[0067] Optionally, the first resistance circuit may include a first resistor, the second resistance circuit may include a second resistor, and the third resistance circuit may include a third resistor.

[0068] like Figure 3 As shown, in Figure 2 Based on at least one embodiment of the voltage conversion circuit shown, the voltage conversion circuit further includes a third resistor circuit 30; the switch circuit 20 includes a switch transistor TK; the first resistor circuit 21 includes a first resistor R1, the second resistor circuit 22 includes a second resistor R2, and the third resistor circuit 30 includes a third resistor R3;

[0069] The switch transistor TK is a triode;

[0070] The base of TK is electrically connected to the analog positive power supply terminal AVDDI through the first resistor R1, the collector of TK is electrically connected to the control voltage terminal VDDIO, the emitter of TK is electrically connected to the ground terminal GND through the second resistor R2; the emitter of TK is electrically connected to the output detection voltage terminal GPIO;

[0071] The base of TK is electrically connected to the ground terminal GND through the third resistor R3.

[0072] exist Figure 3 In at least one embodiment of the voltage conversion circuit shown, the first voltage terminal and the second voltage terminal are ground terminals;

[0073] The control voltage terminal VDDIO is used to provide a control voltage, and the voltage value of the control voltage may be 1.8V;

[0074] But it is not limited to this.

[0075] exist Figure 3 In at least one embodiment shown, TK is an NPN transistor, but the present invention is not limited thereto.

[0076] exist Figure 3 In at least one embodiment shown, the resistance value of R1 may be 1 kilo-ohm, the resistance value of R2 may be 1 kilo-ohm, and the resistance value of R3 may be 1 kilo-ohm, but the present invention is not limited thereto.

[0077] like Figure 3 At least one embodiment of the voltage conversion circuit shown is in operation, when AVDDI normally outputs analog positive power, TK is turned on, and GPIO outputs a 1.8V voltage;

[0078] When the voltage value of the analog positive power supply provided by AVDDI drops below the voltage threshold, TK is turned off and GPIO outputs 0V voltage;

[0079] When the control circuit detects that the GPIO outputs a voltage of 1.8V, the control circuit controls the power management chip to normally provide an analog positive voltage to the analog positive power supply terminal;

[0080] When the control circuit detects that the GPIO outputs a voltage of 0V, the control circuit controls the power management chip to stop providing the analog positive voltage to the analog positive power supply terminal to prevent the power supply voltage detection line from being burned.

[0081] According to another specific implementation, the voltage conversion circuit includes a fourth resistance circuit and a fifth resistance circuit;

[0082] A first end of the fourth resistance circuit is electrically connected to the analog positive power supply terminal, and a second end of the fourth resistance circuit is electrically connected to the output detection voltage terminal;

[0083] The first end of the fifth resistance circuit is electrically connected to the output detection voltage terminal, and the second end of the fifth resistance circuit is electrically connected to the third voltage terminal.

[0084] In a specific implementation, the control circuit is used to compare the output detection voltage and the detection voltage threshold, and is used to control the power management chip to provide an analog positive power to the analog positive power supply terminal when the output detection voltage is greater than the detection voltage threshold, and is used to control the power management chip to stop the analog positive power supply terminal from providing an analog positive power when the output detection voltage is less than the detection voltage threshold.

[0085] In at least one embodiment of the present invention, the detection voltage threshold may be determined according to a resistance value of the fourth resistance circuit and a resistance value of the fifth resistance circuit.

[0086] In at least one embodiment of the present invention, the third voltage terminal may be a low voltage terminal or a ground terminal, but is not limited thereto.

[0087] Optionally, the fourth resistance circuit includes a fourth resistor, and the fifth resistance circuit includes a fifth resistor.

[0088] like Figure 4 As shown, at least one embodiment of the voltage conversion circuit may include a fourth resistor R4 and a fifth resistor R5;

[0089] A first end of the fourth resistor R4 is electrically connected to the analog positive power supply terminal AVDDI, and a second end of the fourth resistor R4 is electrically connected to the output detection voltage terminal GPIO;

[0090] A first end of the fifth resistor R5 is electrically connected to the output detection voltage terminal GPIO, and a second end of the fifth resistor R5 is electrically connected to the ground terminal GND.

[0091] exist Figure 4 In at least one embodiment of the voltage conversion circuit shown, the third voltage terminal is the ground terminal GND, and the resistance value of R4 and the resistance value of R5 can be 1 kilo-ohm, but not limited thereto.

[0092] like Figure 4When at least one embodiment of the voltage conversion circuit shown is working, R4 and R5 divide the analog positive power supply AVDD provided by the analog positive power supply terminal AVDDI, and when the control circuit detects that the output detection voltage provided by GPIO is greater than 3V, the control circuit controls the normal supply of analog positive voltage to the analog positive power supply terminal; when the control circuit detects that the output detection voltage provided by GPIO is greater than 3V, the control circuit controls the power management chip to stop providing the analog positive voltage to the analog positive power supply terminal to prevent the power supply voltage detection line from being burned.

[0093] The power control method according to the embodiment of the present invention is applied to the above-mentioned power control circuit, and the power control method includes:

[0094] The voltage conversion circuit converts the analog positive power supply to obtain an output detection voltage;

[0095] The control circuit controls the power management chip to provide analog positive power to the analog positive power supply terminal according to the output detection voltage.

[0096] The display device described in the embodiment of the present invention includes the above-mentioned power control circuit.

[0097] The display device according to at least one embodiment of the present invention may further include a power supply voltage detection circuit;

[0098] The power supply voltage detection circuit is used to detect the power supply voltage of the display panel through a power supply voltage detection line; the power supply voltage detection line is electrically connected to the analog positive power supply terminal through a first diode;

[0099] An anode of the first diode is electrically connected to the power supply voltage detection line, and a cathode of the first diode is electrically connected to the analog positive power supply terminal.

[0100] exist Figure 5 In the figure, ELVDD_AVC is a power supply voltage detection line, AVDDI is an analog positive power supply terminal, D1 is a first diode, D2 is a second diode, and AVSSI is an analog negative power supply terminal;

[0101] like Figure 5 As shown, the anode of D1 is electrically connected to ELVDD_AVC, the cathode of D1 is electrically connected to AVDDI, the cathode of D2 is electrically connected to ELVDD_AVC, and the anode of D2 is electrically connected to AVSSI.

[0102] The display device provided in the embodiment of the present invention can be any product or component with a display function, such as a wearable device, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, etc.

[0103] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A power control circuit, applied to a display device, the display device comprising a display panel and a power management chip, the power management chip comprising an analog positive power supply terminal; the analog positive power supply terminal is used to provide an analog positive voltage for the display panel; characterized in that: The power supply control circuit includes a voltage conversion circuit and a control circuit; The voltage conversion circuit is electrically connected to the analog positive power supply terminal and is used to convert the analog positive power supply to obtain an output detection voltage; The control circuit is electrically connected to the voltage conversion circuit and the power management chip respectively, and is used to control whether the power management chip provides analog positive power to the analog positive power supply terminal according to the output detection voltage; The control circuit is used to compare the output detection voltage and the detection voltage threshold, and is used to control the power management chip to provide analog positive power to the analog positive power supply end when the output detection voltage is greater than the detection voltage threshold, and is used to control the power management chip to stop the analog positive power supply end from providing analog positive power when the output detection voltage is less than the detection voltage threshold.

2. The power control circuit according to claim 1, characterized in that: The voltage conversion circuit includes a first resistance circuit, a switch circuit and a second resistance circuit; A first end of the first resistance circuit is electrically connected to the analog positive power supply terminal, and a second end of the first resistance circuit is electrically connected to the control terminal of the switch circuit; The first end of the switch circuit is electrically connected to the control voltage end, the second end of the switch circuit is electrically connected to the output detection voltage end, and the switch circuit is used to control the connection or disconnection between the control voltage end and the output detection voltage end under the control of the potential of the control end; The output detection voltage terminal is electrically connected to the first voltage terminal through the second resistance circuit; The control voltage terminal is used to provide a control voltage, and the output detection voltage terminal is used to provide an output detection voltage.

3. The power control circuit according to claim 2, characterized in that: The switch circuit includes a switch transistor; The control electrode of the switch transistor is electrically connected to the second end of the first resistance circuit, the first electrode of the switch transistor is electrically connected to the control voltage end, and the second electrode of the switch transistor is electrically connected to the output detection voltage end.

4. The power control circuit according to claim 3, characterized in that: The switch transistor is an n-type transistor.

5. The power control circuit according to claim 3, characterized in that: The voltage conversion circuit further includes a third resistance circuit; A first end of the third resistance circuit is electrically connected to the control electrode of the switch transistor, and a second end of the third resistance circuit is electrically connected to the second voltage end.

6. The power control circuit according to claim 1, characterized in that: The voltage conversion circuit includes a fourth resistance circuit and a fifth resistance circuit; The first end of the fourth resistor circuit is electrically connected to the analog positive power supply terminal, and the second end of the fourth resistor circuit is electrically connected to the output detection voltage terminal; The first end of the fifth resistance circuit is electrically connected to the output detection voltage terminal, and the second end of the fifth resistance circuit is electrically connected to the third voltage terminal.

7. A power control method, applied to the power control circuit according to any one of claims 1 to 6, characterized in that: The power control method comprises: The voltage conversion circuit converts the analog positive power supply to obtain an output detection voltage; The control circuit controls the power management chip to provide analog positive power to the analog positive power supply terminal according to the output detection voltage.

8. A display device, characterized in that: The method comprises a power control circuit as claimed in any one of claims 1 to 6.

9. The display device according to claim 8, wherein: Also included is a power supply voltage detection circuit; The power supply voltage detection circuit is used to detect the power supply voltage of the display panel through a power supply voltage detection line; the power supply voltage detection line is electrically connected to the analog positive power supply terminal through a first diode; An anode of the first diode is electrically connected to the power supply voltage detection line, and a cathode of the first diode is electrically connected to the analog positive power supply terminal.

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