CN114694583A - Power supply circuit, display panel and display device - Google Patents
Power supply circuit, display panel and display device Download PDFInfo
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- CN114694583A CN114694583A CN202011619605.0A CN202011619605A CN114694583A CN 114694583 A CN114694583 A CN 114694583A CN 202011619605 A CN202011619605 A CN 202011619605A CN 114694583 A CN114694583 A CN 114694583A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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Abstract
The disclosure relates to the technical field of power supply circuits, and provides a power supply circuit, a display panel and a display device.A logic control unit in the power supply circuit is utilized to generate a plurality of first switch control signals and a plurality of second switch control signals according to an input voltage and a control signal; utilizing a first charge pump to respond to the plurality of first switch control signals to operate in a plurality of modes so as to obtain the voltage of the branch node output by the first charge pump and having different multiplication ratios with the input voltage; and responding to the plurality of second switch control signals through a second charge pump, generating negative voltage according to the subnode voltage, and then respectively processing the subnode voltage and the negative voltage by using a voltage stabilizer to correspondingly generate a positive power supply and a negative power supply required by a subsequent circuit. The power circuit adopts an inductance-free scheme of a charge pump structure, the problem of the size of an inductor can be eliminated, the total area of the power circuit is effectively reduced, and the cost of a power chip and a peripheral circuit is reduced while the working efficiency of a power supply is ensured.
Description
Technical Field
The disclosure relates to the technical field of power circuits, in particular to a power circuit, a display panel and a display device.
Background
Power supplies are important components in electronic products. It is a current technological trend to use fewer power supplies in electronic products to simplify power supply requirements. However, in some special electronic applications, it is also necessary to use multiple power sources for power supply, and in particular in some applications, it is necessary to use both positive and negative power sources for power supply.
The electronic applications of the existing simultaneous positive and negative power sources include: the front end part of the office interface circuit, the liquid crystal display, the OLED (Organic Light-Emitting Diode) display, the CCD (Charge Coupled Device) bias, the power amplifying circuit and the instrument analog input of the traditional telephone. Except the front-end simulation part of the instrument, other parts are applied to large-scale power supplies, and a large number of special mature commercial products are available. Aiming at the front-end simulation part of an instrument and meter, a discrete power circuit combination is generally used for realizing a positive power supply and a negative power supply due to the special requirements of testing.
Compared with the conventional liquid crystal panel, an Active Matrix Organic Light Emitting Diode (AMOLED) panel has the characteristics of fast response speed, high contrast ratio, wide viewing angle and the like. The smart phone is widely used in smart bracelets, smart watches, smart phones, tablet computers, notebook computers and the like. Existing power chips and power circuits (such as power supplies of AMOLEDs) providing positive and negative power supplies almost all employ DC-DC converters with an inductive architecture. As shown in fig. 1, in a conventional power circuit 100 based on an inductor structure and used for an active matrix organic light emitting diode panel, the power circuit 100 has a voltage input terminal VIN, a clock control signal input terminal CTRL, a positive voltage output terminal ELVDD, and a negative voltage output terminal ELVSS, and the power circuit 100 further includes: a logic control unit 120 respectively connected to the Voltage input terminal VIN and the clock control signal input terminal CTRL, a DC-DC converter 110 connected to the Voltage input terminal VIN and the logic control unit 120, a Negative Voltage Charge Pump (Negative Voltage Charge Pump)130, a low dropout linear regulator (LDO)140 connected between the DC-DC converter 110 and the positive Voltage output terminal ELVDD, and an LDO 150 connected between the Negative Voltage Charge Pump 130 and the Negative Voltage output terminal ELVSS. The power circuit 100 boosts the voltage input from the voltage input terminal VIN to a certain magnification based on the (boost or buck-boost) DC-DC converter 110 with an inductor structure, generates an intermediate node voltage VOP with an absolute voltage slightly higher than the positive output voltage and the negative output voltage, and generates a positive output voltage after the intermediate node voltage VOP is stepped down by the LDO 140, and provides the positive output voltage ELVDD to the load circuit of the AMOLED. A circuit that generates the intermediate node voltage VON by using the negative voltage charge pump 130 and then generates an output negative voltage through the LDO 150 has been developed in a large number of mature commercial products, and the output negative voltage is provided to the load circuit of the AMOLED through the negative voltage output terminal ELVSS.
The AMOLED power supply circuit of the current scheme is a switch power supply framework based on an inductor, the area and the thickness of the inductor severely restrict the selection of the inductor in the application of extremely paying attention to the size and the height of a device such as an intelligent bracelet, an intelligent watch and the like, the circuit design and the product thickness design are influenced, a customer is often forced to select the inductor with a relatively small size but a large direct current impedance DCR, the working efficiency is sacrificed, and the standby time is shortened.
In addition, the output voltage noise of the boost-type or buck-type power converter in the prior art is increased, and in electronic products requiring low noise and stable voltage, the application causes serious electromagnetic interference EMI and radiation problems due to the periodic charging and discharging process of the inductor, and is severely limited in the case of radio frequency and other noise sensitive occasions.
Disclosure of Invention
In order to solve the technical problem, the present disclosure provides a power supply circuit, a display panel and a display device, which can eliminate the size problem of an inductor, effectively reduce the total area of the power supply circuit, and reduce the cost of a power supply chip and a peripheral circuit while ensuring the working efficiency of a power supply.
This disclosure provides a power supply circuit for display panel in one aspect, this power supply circuit has voltage input end, control signal input end, malleation output and negative voltage output, and wherein, this power supply circuit still includes:
a logic control unit, the input end of which is respectively connected with the voltage input end and the control signal input end and has a first output end and a second output end, and the logic control unit is configured to generate a plurality of first switch control signals and a plurality of second switch control signals according to the input voltage and the control signals;
a first charge pump, an input terminal of which is respectively connected to the voltage input terminal and the first output terminal of the logic control unit, configured to operate in multiple modes in response to the plurality of first switch control signals, so as to obtain different multiplication ratios of the node voltage outputted by the first charge pump to the input voltage;
and a second charge pump, an input end of which is respectively connected with the second output end of the logic control unit and the output end of the first charge pump, and configured to respond to the plurality of second switch control signals and generate a negative voltage according to the node voltage.
Preferably, the aforementioned power supply circuit further includes:
the positive voltage stabilizer is connected with the output end of the first charge pump and used for converting the subnode voltage into a first output power supply and outputting the first output power supply to the positive voltage output end;
a negative voltage stabilizer connected with the output end of the second charge pump for converting the negative voltage into a second output power supply and outputting the second output power supply to the negative voltage output end,
the first output power supply is a positive power supply with a first target voltage, and the second output power supply is a negative power supply with a second target voltage.
Preferably, the multiplication ratio of the voltage of the division node to the input voltage to obtain the output of the first charge pump is greater than 0 and less than or equal to 1, or greater than 1.
Preferably, the aforementioned power supply circuit is integrated on one chip.
Preferably, the power supply circuit is connected with:
and the voltage stabilizing capacitor is positioned outside the chip and is coupled with the first charge pump.
Preferably, the display panel is an active matrix organic light emitting diode panel.
In another aspect, the present disclosure also provides a display panel including:
a load circuit for generating a driving current to drive the light emitting element; and
the power supply circuit as described above, which is configured to supply the positive power supply and the negative power supply to the aforementioned load circuit.
Preferably, the aforementioned load circuit includes:
a first transistor, a first end of which is connected with a data signal, a second end of which is connected with a positive voltage output end of the power supply circuit through a second transistor, and a control end of which is connected with an (n) th-stage scanning signal;
a third transistor, a fourth transistor, and the light emitting element, which are connected in series between a connection node of the first transistor and the second transistor and a negative voltage output terminal of the power supply circuit, wherein a control terminal of the fourth transistor and a control terminal of the second transistor are connected in common to receive an (n) th-stage enable signal;
the positive electrode of the storage capacitor is connected with the positive voltage output end of the power supply circuit, the negative electrode of the storage capacitor is connected with the first end of the fifth transistor, the control end of the fifth transistor is connected with an (n-1) th-stage scanning signal, and the second end of the fifth transistor receives low level; and
and a sixth transistor having a first terminal connected to the control terminal of the third transistor, a second terminal connected to the second terminal of the third transistor, and a control terminal connected to the control terminal of the first transistor.
Preferably, the display panel is an active matrix organic light emitting diode panel, and the light emitting device is a light emitting diode.
In another aspect, the present disclosure further provides a display device, including: a display panel as described above.
The beneficial effects of this disclosure are: the power circuit is provided with a voltage input end, a control signal input end, a positive voltage output end and a negative voltage output end, and a logic control unit in the power circuit is utilized to generate a plurality of first switch control signals and a plurality of second switch control signals according to input voltage and control signals; utilizing the first charge pump to respond to the plurality of first switch control signals to operate in a plurality of modes so as to obtain the node voltage which is output by the first charge pump and has different multiplication ratios with the input voltage; and responding to the plurality of second switch control signals through a second charge pump, generating negative voltage according to the subnode voltage, and then respectively processing the subnode voltage and the negative voltage by using a voltage stabilizer to correspondingly generate a positive power supply and a negative power supply required by a subsequent circuit. The power circuit adopts an inductance-free scheme of a charge pump structure, can eliminate the problem of inductance size, improve the problem of electromagnetic interference (EMI), effectively reduce the total area of the power circuit, and reduce the cost of a power chip and a peripheral circuit while ensuring the working efficiency of the power supply.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent from the following description of the embodiments of the present disclosure with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a power circuit based on an inductor structure for an AMOLED panel disclosed in the prior art;
FIG. 2 is a schematic diagram illustrating a power circuit based on a capacitor structure for an AMOLED panel according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an active matrix organic light emitting diode panel according to a second embodiment of the disclosure;
FIG. 4 is a schematic diagram of a load circuit in the AMOLED panel shown in FIG. 3.
Detailed Description
To facilitate an understanding of the present disclosure, the present disclosure will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present disclosure are set forth in the accompanying drawings. However, the present disclosure may be embodied in different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs and are used in the specification of the present disclosure for the purpose of describing particular embodiments only and are not intended to limit the present disclosure.
The present disclosure is described in detail below with reference to the accompanying drawings.
The first embodiment is as follows:
fig. 2 is a schematic structural diagram of a power circuit based on a capacitor structure for an active matrix organic light emitting diode panel according to an embodiment of the present disclosure.
Referring to fig. 2, a first embodiment of the present disclosure provides a power circuit 200 based on a capacitor structure for an active matrix organic light emitting diode panel, the power circuit 200 having a voltage input terminal VIN, a control signal input terminal CTRL, a positive voltage output terminal ELVDD, and a negative voltage output terminal ELVSS, the power circuit 200 further including: a logic control unit 210, a first charge pump 220 and a second charge pump 230,
wherein the input terminal of the logic control unit 210 is connected to the aforementioned voltage input terminal VIN and control signal input terminal CTRL, respectively, and has a first output terminal and a second output terminal, and the logic control unit 210 is configured to generate a plurality of first switch control signals EA and a plurality of second switch control signals EB according to the input voltage VIN and the control signal CTRL;
the input terminal of the first charge pump 220 is respectively connected to the voltage input terminal VIN and the first output terminal of the logic control unit 210, the first charge pump 220 is configured to operate in multiple modes in response to the first switch control signals EA, so as to obtain the node voltage VOP output by the first charge pump 220 and the input voltage VIN in different multiplication ratios;
the input terminal of the second charge pump 230 is respectively connected to the second output terminal of the logic control unit 210 and the output terminal of the first charge pump 220, and configured to generate the negative voltage VON according to the node voltage VOP in response to the plurality of second switch control signals EB.
Further, the power supply circuit 200 further includes: a positive voltage regulator 240 and a negative voltage regulator 250, wherein the positive voltage regulator 240 is connected to the output terminal of the first charge pump 220, and is configured to convert the node voltage VOP into a first output power Vdd and output the first output power Vdd to the positive voltage output terminal ELVDD; the negative voltage regulator 250 is connected to the output terminal of the second charge pump 230, and is used for converting the negative voltage VON into a second output power Vss, outputting the second output power Vss to the negative voltage output terminal ELVSS,
the first output power supply Vdd is a positive power supply with a first target voltage, and the second output power supply Vss is a negative power supply with a second target voltage.
In the present embodiment, the positive voltage regulator 240 and the negative voltage regulator 250 are both low dropout linear regulators (LDOs), for example, and it is known that the Low Dropout (LDO) linear regulators have the outstanding advantages of low cost, low noise, and small static current, and they require few external components and low loss. LDO (Low dropout) regulators with positive output voltage usually use a power transistor (also called pass device) as PNP, which transistor allows saturation, so the regulator can have a very low dropout voltage, usually around 200 mV; in contrast, the voltage drop of the conventional linear regulator using the NPN composite power transistor is about 2V. The negative output LDO uses NPN as its pass device and operates in a similar mode as the PNP device of the positive output LDO. A more recent development is the use of CMOS power transistors, which are capable of providing the lowest drop-out voltage.
Further, the first Charge Pump 220 is a Variable-rate Charge Pump (Ratio Variable Charge Pump), and a multiplication Ratio of the voltage VOP at the node of the output of the first Charge Pump 220 to the input voltage Vin is greater than 0 and less than or equal to 1, or greater than 1.
Specifically, the first charge pump 220 transfers the input voltage Vin to the intermediate node to generate the node voltage VOP by using its own input/output pass function (1-time mode); if the input voltage Vin is insufficient, the input voltage Vin is boosted to a certain multiplying factor (such as 1.33 times, 1.5 times, 2 times, etc.) by a variable multiplying factor charge pump (the first charge pump 220) to generate a node voltage VOP; alternatively, when the input voltage Vin is particularly high, the voltage drop function (e.g., 0.33 times, 0.5 times, etc.) of the variable charge pump (the first charge pump 220) can be used to output the voltage VOP. The sub-node voltage VOP is then stepped down by the LDO (positive voltage regulator 240) to generate a first output power Vdd, and the first output power Vdd is provided to a subsequent stage circuit through a positive voltage output terminal ELVDD. The circuit for generating the intermediate node voltage VON by the negative charge pump 130 and then generating the output negative voltage through the LDO 150 has been a large number of mature commercial products, and therefore will not be described in detail herein.
Further, the logic control unit 210, the first charge pump 220, the second charge pump 230, the positive voltage regulator 240, and the negative voltage regulator 250 of the power circuit 200 are integrated on a chip.
Further, the power supply circuit 200 is connected with: a voltage stabilizing capacitor Cm, which is located outside the chip and coupled to the first charge pump 220.
Furthermore, the voltage stabilizing capacitor Cm can be designed to be changed into 1 or more sub-capacitors according to different multiplying power requirements.
Further, the display panel is an Active Matrix Organic Light Emitting Diode (AMOLED) panel.
The AMOLED power supply circuit of the prior art is a switch power supply framework based on an inductor, and in the application occasions with compact sizes such as an intelligent bracelet and an intelligent watch, the size (area and height) of the inductor is too large, so that the circuit design and the product thickness design can be influenced, the height of the bracelet and the watch can be indirectly influenced, a customer is forced to be thickened, and meanwhile, the inductor with a relatively small size but a relatively large direct current impedance DCR is forced to be selected, so that the working efficiency is sacrificed, and the standby time is shortened.
The embodiment of the disclosure adopts an inductance-free scheme of a charge pump structure, directly eliminates the influence of the size of the inductance on the product design, and effectively reduces the total area of a power circuit;
in addition, the power circuit 200 can eliminate the problem of electromagnetic interference EMI commonly existing in the power circuit with an inductive architecture, and further reduce the cost of the power chip and the peripheral circuit while ensuring the working efficiency of the power supply.
Example two:
fig. 3 shows a schematic structural diagram of an active matrix organic light emitting diode panel according to a second embodiment of the disclosure, and fig. 4 shows a schematic structural diagram of a load circuit in the active matrix organic light emitting diode panel shown in fig. 3.
Referring to fig. 3 and 4, in another aspect, a second embodiment of the present disclosure also provides a display panel 10, where the display panel 10 includes:
a load circuit 300 for generating a driving current to drive the light emitting element DLE; and
as with the power supply circuit 200 described above, the power supply circuit 200 is configured to provide positive power and negative power to the aforementioned load circuit 300.
Referring to fig. 4, the load circuit 300 is a circuit product mature in the prior art, and again, as a schematic description, includes: a transistor T1, a transistor T2, a transistor T3, a transistor T4, a transistor T5, and a transistor T6, and a storage capacitor Cst and a light emitting element DLE,
the first terminal of the transistor T1 is connected to the DATA signal DATA, the second terminal is connected to the positive voltage output terminal ELVDD of the power supply circuit 200 through the transistor T2, the first output power supply is connected, and the control terminal is connected to the (n) th SCAN signal SCAN [ n ];
the transistor T3, the transistor T4, and the light emitting element DLE are connected in series between the connection node of the transistor T1 and the transistor T2 and the negative voltage output terminal ELVSS of the aforementioned power supply circuit 200, and the control terminal of the transistor T4 and the control terminal of the transistor T2 are commonly connected to the (n) th stage enable signal EM [ n ];
the storage capacitor Cst is connected in series with the transistor T5, the positive electrode of the storage capacitor Cst is connected to the positive voltage output terminal ELVDD of the power circuit 200, the negative electrode is connected to the first terminal of the transistor T5, the control terminal of the transistor T5 is connected to the (n-1) th SCAN signal SCAN [ n-1], and the second terminal receives the low level Vint;
the transistor T6 has a first terminal connected to the control terminal of the transistor T3, a second terminal connected to the second terminal of the transistor T3, and a control terminal connected to the control terminal of the transistor T1.
Further, the display panel 10 is an active matrix organic light emitting diode panel (AMOLED), and the light emitting element DLE is a light emitting diode.
Further, the transistor T1, the transistor T2, the transistor T3, the transistor T4, the transistor T5, and the transistor T6 are all thin film transistors, specifically, the transistor T3 is a driving thin film transistor (Driver TFT), and the transistor T1 is a switching thin film transistor (Switch TFT). The remaining transistor combinations are used as a compensation circuit to cooperatively compensate for a change in the driving current for driving the light emitting element DLE caused by a shift in the threshold voltage of the driving tft T3, and to stabilize the potential of the gate of the driving tft T3, so as to stabilize the driving current for driving the light emitting element DLE generated by the load circuit 300, and the stabilization of the driving current for driving the light emitting element DLE does not affect the light emitting brightness of the light emitting element DLE, thereby improving the image quality of the display panel to which the load circuit 300 is applied.
In this embodiment, the first terminal is a source and the corresponding second terminal is a drain. In another embodiment, the first end may be a drain, and the corresponding second end may be a source.
Example three:
on the other hand, the present disclosure also provides a display device (not shown) including the display panel 10 as described in the foregoing embodiments, and more specifically, the display panel 10 is an active matrix organic light emitting diode panel (AMOLED).
To sum up, the power circuit 200, the display panel 10 and the display device (not shown) provided by the embodiment of the disclosure, wherein the power circuit 200 has a voltage input terminal VIN, a control signal input terminal CTRL, a positive voltage output terminal ELVDD and a negative voltage output terminal ELVSS, and the logic control unit 210 in the power circuit 200 is utilized to generate a plurality of first switch control signals EA and a plurality of second switch control signals EB according to the input voltage VIN and the control signal CTRL; then, the first charge pump 220 is operated in multiple modes in response to the first switch control signals EA to obtain a node voltage VOP outputted by the first charge pump 220 and having a different multiplication ratio from the input voltage Vin; and responding to the plurality of second switch control signals EB through the second charge pump 230, generating a negative voltage VON according to the sub-node voltage VOP, and then processing the sub-node voltage VOP and the negative voltage VON respectively by using voltage regulators (the positive voltage regulator 240 and the negative voltage regulator 250) to correspondingly generate a positive power supply Vdd and a negative power supply Vss required by a subsequent circuit. This power supply circuit 200 adopts the noninductive scheme of charge pump structure, can eliminate inductance size problem, improves electromagnetic interference EMI's problem, effectively reduces power chip's area, reduces power chip and peripheral circuit's cost when guaranteeing power work efficiency, has high practicality, is suitable for popularization and application.
It should be noted that in the description of the present disclosure, it is to be understood that the terms "upper", "lower", "inner", and the like, indicate orientation or positional relationship, are only for convenience in describing the present disclosure and simplifying the description, but do not indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present disclosure.
Further, in this document, the contained terms "include", "contain" or any other variation thereof are intended to cover a non-exclusive inclusion, so that a process, a method, an article or an apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such process, method, article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present disclosure, and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention as herein taught are within the scope of the present disclosure.
Claims (10)
1. A power supply circuit for a display panel, the power supply circuit having a voltage input terminal, a control signal input terminal, a positive voltage output terminal and a negative voltage output terminal, wherein the power supply circuit further comprises:
a logic control unit, an input end of which is respectively connected with the voltage input end and the control signal input end and has a first output end and a second output end, and the logic control unit is configured to generate a plurality of first switch control signals and a plurality of second switch control signals according to the input voltage and the control signals;
a first charge pump having inputs respectively connected to the voltage input and the first output of the logic control unit, configured to operate in multiple modes in response to the plurality of first switch control signals to obtain a different multiplication ratio of a node voltage output by the first charge pump to an input voltage;
a second charge pump having an input terminal connected to the second output terminal of the logic control unit and the output terminal of the first charge pump, respectively, and configured to generate a negative voltage according to the node voltage in response to the plurality of second switch control signals.
2. The power supply circuit of claim 1, further comprising:
the positive voltage stabilizer is connected with the output end of the first charge pump and used for converting the sub-node voltage into a first output power supply and outputting the first output power supply to the positive voltage output end;
a negative voltage stabilizer connected with the output end of the second charge pump and used for converting the negative voltage into a second output power supply and outputting the second output power supply to the negative voltage output end,
the first output power supply is a positive power supply with a first target voltage, and the second output power supply is a negative power supply with a second target voltage.
3. The power supply circuit according to claim 2, wherein a multiplication ratio of a division node voltage to an input voltage at which the first charge pump output is obtained is greater than 0 and less than or equal to 1, or greater than 1.
4. The power supply circuit of claim 2, wherein the power supply circuit is integrated on one chip.
5. The power supply circuit of claim 4, wherein the power supply circuit has connected thereto:
and the voltage stabilizing capacitor is positioned outside the chip and is coupled with the first charge pump.
6. The power supply circuit of claim 1, wherein the display panel is an active matrix organic light emitting diode panel.
7. A display panel, comprising:
a load circuit for generating a driving current to drive the light emitting element; and
a power supply circuit as claimed in any one of claims 1 to 6, configured to provide positive and negative power to the load circuit.
8. The display panel of claim 7, wherein the load circuit comprises:
a first end of the first transistor is connected with a data signal, a second end of the first transistor is connected with a positive voltage output end of the power supply circuit through a second transistor, and a control end of the first transistor is connected with an (n) th-stage scanning signal;
a third transistor, a fourth transistor, and the light emitting element, which are connected in series between a connection node of the first transistor and the second transistor and a negative voltage output terminal of the power supply circuit, wherein a control terminal of the fourth transistor and a control terminal of the second transistor are connected in common to access an (n) th stage enable signal;
the positive electrode of the storage capacitor is connected with the positive voltage output end of the power supply circuit, the negative electrode of the storage capacitor is connected with the first end of the fifth transistor, the control end of the fifth transistor is connected with an (n-1) th-stage scanning signal, and the second end of the fifth transistor receives a low level; and
and a first end of the sixth transistor is connected with the control end of the third transistor, a second end of the sixth transistor is connected with the second end of the third transistor, and the control end of the sixth transistor is connected with the control end of the first transistor.
9. The display panel of claim 8, wherein the display panel is an active matrix organic light emitting diode panel and the light emitting elements are light emitting diodes.
10. A display device, comprising: the display panel according to claims 7 to 9.
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| CN202011619605.0A CN114694583A (en) | 2020-12-31 | 2020-12-31 | Power supply circuit, display panel and display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116054307A (en) * | 2022-07-27 | 2023-05-02 | 荣耀终端有限公司 | Power supply control system and electronic equipment |
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| CN116054307B (en) * | 2022-07-27 | 2023-10-20 | 荣耀终端有限公司 | Power supply control system and electronic equipment |
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