CN208157021U - A kind of power control circuit - Google Patents
A kind of power control circuit Download PDFInfo
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- CN208157021U CN208157021U CN201820817049.XU CN201820817049U CN208157021U CN 208157021 U CN208157021 U CN 208157021U CN 201820817049 U CN201820817049 U CN 201820817049U CN 208157021 U CN208157021 U CN 208157021U
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Abstract
The utility model embodiment discloses a kind of power control circuit, including the first power supply chip and second source chip, wherein, first output pin of the first power supply chip provides the cathode voltage of the Organic Light Emitting Diode of AMOLED display panel, second output pin provides the cathode voltage of Organic Light Emitting Diode, the output of third output pin zero current；4th output pin of second source chip provides the operating voltage of the driving chip of AMOLED display panel.It is set as zero current output since ELVDD, ELVSS voltage can be provided by two output pins of the first power supply chip, while by another voltage output pin, provides AVDD voltage by second source chip.In this way, can effectively avoid by the first power supply chip while providing AVDD, ELVDD, ELVSS this three roads voltage, interdepend between three road voltages, and mutual driving force is dragged down in the driving force individually exported the technical issues of.
Description
Technical field
The utility model relates to field of display technology more particularly to a kind of power control circuits.
Background technique
Currently, flexible active matrix Organic Light Emitting Diode (Active-matrix organic light emitting
Diode, AMOLED) screen driving circuit power control part, mostly use integrated multipath power supply control Special electric source core
Piece (power IC), is aided with the design of the peripheral circuit of adaptation.For the flexible AMOLED screen of current main-stream, required voltage
Mainly there are three tunnels, be AVDD, ELVDD, ELVSS respectively, this three roads voltage is provided by above-mentioned power source special chip.However,
When power source special chip exports this three roads voltage simultaneously, mutual driving force can be dragged down in the driving force individually exported, into
And make the driving capability of power source special chip insufficient, it is merely able to support that the power supply of the flexible screen of small-medium size is supplied, and nothing
Method drives larger sized flexible screen.
In view of the continuous improvement of current screen specification, the power consumption of screen is also become larger.In the prior art, it such as to obtain
Power control circuit with bigger driving capability is typically only capable to power supply chip manufacturer custom chip, this is for AMOLED
For the research and development of screen product, design cost is higher, and can significantly extend research and development of products time-consuming.
In conclusion there is an urgent need for a kind of power control circuits at present, the drive of the power circuit to improve AMOLED screen
Kinetic force.
Utility model content
The utility model provides a kind of power control circuit, the driving energy of the power circuit to improve AMOLED screen
Power.
A kind of power control circuit provided by the embodiment of the utility model, the circuit are applied to active matrix organic light-emitting
Diode AMOLED display panel, the circuit include the first power supply chip and second source chip；
Wherein, the first output pin of first power supply chip provides the organic light emission two of the AMOLED display panel
The cathode voltage of pole pipe, the second output pin provide the cathode voltage of the Organic Light Emitting Diode, zero electricity of third output pin
Stream output；
4th output pin of the second source chip provides the work of the driving chip of the AMOLED display panel
Voltage.
It optionally, further include the first peripheral circuit；
5th input pin of the voltage input end of first peripheral circuit and first power supply chip, described first
6th control pin electrical connection of power supply chip；
First power supply chip is used for the input signal according to the 6th control pin, controls the third output and draws
The output of foot zero current.
Optionally, the third output pin is grounded by the first branch, is provided with light-emitting diodes in the first branch
Pipe.
It optionally, further include the second peripheral circuit；Second peripheral circuit is electrically connected with the 4th output pin；
Second peripheral circuit obtains first voltage for converting to the output voltage of the 4th output pin
The output voltage of output end, the driving chip by the first voltage output end for the AMOLED display panel provide work
Voltage.
Optionally, second peripheral circuit includes first be series between the first voltage output end and grounding point
Resistance and second resistance；
The Voltage Feedback pin of the second source chip is connected between the first resistor and the second resistance, institute
Second source chip is stated for setting the output of the first voltage output end by the first resistor and the second resistance
Voltage.
Optionally, second peripheral circuit is also used to convert the output voltage of the 4th output pin, obtains
Voltage input end to the output voltage of second voltage output end, the second voltage output end and the first peripheral circuit is electrically connected
It connects.
Optionally, second peripheral circuit includes the third being series between the first voltage output end and grounding point
Resistance and the 4th resistance；The second voltage output end is connected between the 3rd resistor and the 4th resistance.
Optionally, second peripheral circuit further includes the electricity being series between the first voltage output end and grounding point
Hold.
Optionally, the overcurrent protection pin of the second source chip is used by the 5th resistance eutral grounding, the 5th resistance
In the soft start speed that the second source chip is arranged.
The utility model embodiment can provide this two-way of ELVDD, ELVSS by two output pins of the first power supply chip
Voltage, while zero current output is set by another voltage output pin, this road voltage of AVDD is provided by second source chip.Such as
This, can effectively avoid by the first power supply chip while providing AVDD, ELVDD, ELVSS this three roads voltage, phase between three road voltages
It mutually relies on, and mutual driving force is dragged down in the driving force individually exported the technical issues of.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly introduced, it should be apparent that, the accompanying drawings in the following description is only some implementations of the utility model
Example, for those of ordinary skill in the art, without any creative labor, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 is the structural schematic diagram of power control circuit in the prior art；
Fig. 2 is the structural schematic diagram of power driving circuit provided by the embodiment of the utility model.
Specific embodiment
It is practical to this below in conjunction with attached drawing in order to keep the purpose of this utility model, technical solution and advantage clearer
It is novel to be described in further detail, it is clear that described embodiment, only the utility model a part of the embodiment, without
It is whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative labor
All other embodiment obtained under the premise of dynamic, fall within the protection scope of the utility model.
The utility model embodiment is described in further detail with reference to the accompanying drawings of the specification.
Fig. 1 illustrates the structural schematic diagram of power control circuit in the prior art, as shown in Figure 1, the power supply control
It include a power source special chip and matching peripheral circuit in circuit processed.The power source special chip has 3 voltages
Output pin, wherein voltage output pin 1 (OUTPUT1 pin shown in figure) is used to export ELVDD, voltage output pin 2
(OUTN pin shown in figure) is used to export ELVSS, and voltage output pin 3 (OUTPUT2 pin shown in figure) is used to defeated
AVDD out.Control signal pins 1 (EN pin shown in figure) and control signal pins 2 (CTRL pin shown in figure) respectively
Input AMOLED screen the OLED_EN signal and SWIRE signal that feed back to, for enable this three roads voltage and set AVDD and
The voltage value of ELVSS.
Fig. 2 illustrates the structural schematic diagram of power control circuit provided by the embodiment of the utility model, such as Fig. 2 institute
Show, which includes the first power supply chip U1 and second source chip U2.
Wherein, the first output pin 101 of the first power supply chip U1 is used to provide the described the organic of AMOLED display panel
The cathode voltage of light emitting diode, i.e. ELVDD；Second output pin 102 is used to provide the described the cathode of Organic Light Emitting Diode
Voltage, i.e. ELVSS；The output of 103 zero current of third output pin.The 4th output pin 301 of second source chip U2 provides institute
State the operating voltage of the driving chip of AMOLED display panel, i.e. AVDD.
The utility model embodiment can provide this two-way of ELVDD, ELVSS by two output pins of the first power supply chip
Voltage, while zero current output is set by another voltage output pin, this road voltage of AVDD is provided by second source chip.Such as
This, can effectively avoid by the first power supply chip while providing AVDD, ELVDD, ELVSS this three roads voltage, phase between three road voltages
It mutually relies on, and mutual driving force is dragged down in the driving force individually exported the technical issues of.
The power control circuit may also include the first peripheral circuit being adapted to the first power supply chip U1, as shown in Fig. 2, should
The voltage input end 201 of first peripheral circuit can be electrically connected with the 5th input pin 105 of the first power supply chip U1, for being to be somebody's turn to do
First power supply chip provides operating voltage.
The voltage input end 201 of first peripheral circuit can also be electrically connected with the 6th control pin 106 of the first power supply chip
It connects.6th control pin 106 is that the corresponding signal of third output pin 103 controls pin, is drawn by the way that the 6th control is arranged
The input signal of foot 106, the first power supply chip can control the output of third output pin 103.In the utility model embodiment, when
When the input signal of 6th control pin 106 is high level, the first power supply chip U1 can control 103 zero current of third output pin
Output.
As shown in Fig. 2, the voltage input end 201 of the first peripheral circuit U1 is connect by concatenated two resistance (i.e. R6 and R7)
Ground, the 6th control pin 106 are connected between resistance R6 and resistance R7.In this way, passing through resistance when the first peripheral circuit powers on
The input signal of 6th control pin 106 can be set as high level, such third output pin by the effect of the partial pressure of R6 and resistance R7
103 output is just set as 0.
In the utility model embodiment, third output pin 103 can be grounded by the first branch, be connected in the first branch
There are resistance R8 and light emitting diode D1.In this way, by the way that light emitting diode D1 is arranged in the first branch, can effectively to detect third defeated
The output of pin out, if the output electric current of third output pin is not zero, then light emitting diode D1 will shine, to provide
The prompt information of first power supply chip operation irregularity, avoids the output because of third output pin, influences the first output pin and the
The output voltage of two output pins.
It should be noted that further include other such as resistance, capacitor, inductance, diode element in first peripheral circuit,
But since its setting purpose and effect in the prior art are same or similar, the utility model is not particularly limited this.
The power control circuit may also include the second peripheral circuit being adapted to second source chip U2, second periphery
Circuit is electrically connected with the 4th output pin；
Specifically, second peripheral circuit obtains first for converting to the output voltage of the 4th output pin 301
The output voltage of voltage output end 202 is provided by the first voltage output end 202 for the driving chip of AMOLED display panel
Operating voltage, i.e. offer AVDD.
In the utility model embodiment, the second peripheral circuit include be series at first voltage output end 202 and grounding point it
Between first resistor R1 and second resistance R2.The Voltage Feedback pin 302 of second source chip is connected to first resistor R1 and
Between two resistance R2, second source chip is used to that first voltage output end can be set by first resistor R1 and second resistance R2
202 output voltage.
As shown in Fig. 2, the potential point 1 positioned at one end of first resistor R1 connects first voltage output end, current potential is equal to
The output voltage of first voltage output end 202.Potential point 1 passes sequentially through diode D2 and capacitor C1 and the 4th output pin 301
Electrical connection, wherein diode D2 exports sense of current, diode D2 and capacitor C1 for controlling the 4th output pin 301
Between potential point 3 be grounded by inductance L1, capacitor C1 and inductance L1 are used for energy reserve.It, should in the utility model embodiment
It can also be in series with capacitor C2 between potential point 1 and ground, stablize the output voltage of first voltage output end 202 with this.
It is anti-positioned at one end of the potential point 2 and second resistance R2 of the first resistor R1 other end, the voltage of second source chip
It presents pin 302 to be electrically connected, the other end ground connection of second resistance R2.
In the utility model embodiment, converted in output voltage of second peripheral circuit to the 4th output pin 301
When, the output voltage of second voltage output end 203 also can be obtained, the electricity of the second voltage output end 203 and the first peripheral circuit
Input terminal 201 is pressed to be electrically connected (as shown in phantom in Figure 2).In this way, second source chip may be used also after second source chip powers on
Operating voltage is provided for the first power supply chip by second voltage output end 203, to effectively control AVDD, ELVDD, ELVSS
The enabled timing of three road voltages first enables AVDD, then enabled ELVDD, ELVSS.
As shown in Fig. 2, the second peripheral circuit includes the third electricity being series between first voltage output end 202 and grounding point
R3 and the 4th resistance R4 is hindered, second voltage output end 203 is connected between 3rd resistor R3 and the 4th resistance R4.In this way, passing through
The effect of the partial pressure of 3rd resistor R3 and the 4th resistance R4, can be obtained the output voltage of second voltage output end 203, thus as the
The input voltage of one power supply chip is input to the voltage input end 201 of the first peripheral circuit.
In the utility model embodiment, which may also include：
The voltage input pin 303 of second source chip is grounded by capacitor C3, to filter out interference；Signal controls pin
304 input OLED_EN control signal, for enabling AVDD；Overcurrent protection pin 305 is grounded by the 5th resistance R5, to set
Set the soft start speed of second source chip.
In the utility model embodiment, the parameter value of each element in the first peripheral circuit and the second peripheral circuit,
Can specifically it be arranged by those skilled in the art according to the specification of screen, the utility model is not particularly limited this.
Comparison diagram 1 and Fig. 2 are it is found that according to power control circuit shown in Fig. 1, with the peripheral circuit identified in scheming
In each constituent element parameter value for, then output can reach AVDD (6.4V, 50mA), ELVDD (4.6V, 200mA),
ELVSS (- 2.5V, 200mA).
And according to power driving circuit shown in Fig. 2, with R1=29k Ω, R2=3k Ω in the first peripheral circuit, R3
=1k Ω, R4=2k Ω, R5=51k Ω, C1=22uF, C2=22uF, C3=22uF, L1=4.7uH, L2=4.7uH, the second
R6=6k Ω in peripheral circuit, R7=5k Ω, R8=10k Ω, the device parameter values at other positions, which are chosen with Fig. 1, is mutually all
Example, then output can reach AVDD (6.4V, 300mA), ELVDD (4.6V, 250mA), ELVSS (- 2.5V, 250mA), i.e., three
Output voltage corresponding electric current in road is obviously improved.
By above content it can be seen that：
The utility model embodiment can provide this two-way of ELVDD, ELVSS by two output pins of the first power supply chip
Voltage, while zero current output is set by another voltage output pin, this road voltage of AVDD is provided by second source chip.Such as
This, can effectively avoid by the first power supply chip while providing AVDD, ELVDD, ELVSS this three roads voltage, phase between three road voltages
It mutually relies on, and mutual driving force is dragged down in the driving force individually exported the technical issues of.
Although the alternative embodiment of the utility model has been described, once a person skilled in the art knows basic
Creative concept, then additional changes and modifications may be made to these embodiments.It is wrapped so the following claims are intended to be interpreted as
It includes alternative embodiment and falls into all change and modification of the scope of the utility model.
Obviously, it is practical without departing from this can to carry out various modification and variations to the utility model by those skilled in the art
Novel spirit and scope.If in this way, these modifications and variations of the present invention belong to the utility model claims and
Within the scope of its equivalent technologies, then the utility model is also intended to include these modifications and variations.
Claims (9)
1. a kind of power control circuit, which is characterized in that the circuit is applied to active matrix organic light-emitting diode AMOLED
Display panel, the circuit include the first power supply chip and second source chip；
Wherein, the first output pin of first power supply chip provides the Organic Light Emitting Diode of the AMOLED display panel
Cathode voltage, the second output pin provides the cathode voltage of the Organic Light Emitting Diode, and third output pin zero current is defeated
Out；
4th output pin of the second source chip provides the operating voltage of the driving chip of the AMOLED display panel.
2. power control circuit according to claim 1, which is characterized in that further include the first peripheral circuit；
The 5th input pin, first power supply of the voltage input end of first peripheral circuit and first power supply chip
6th control pin electrical connection of chip；
First power supply chip is used to control the third output pin zero according to the input signal of the 6th control pin
Electric current output.
3. power control circuit according to claim 2, which is characterized in that the third output pin passes through the first branch
It is grounded, is provided with light emitting diode in the first branch.
4. power control circuit according to claim 1, which is characterized in that further include the second peripheral circuit；Described second
Peripheral circuit is electrically connected with the 4th output pin；
Second peripheral circuit obtains first voltage output for converting to the output voltage of the 4th output pin
The output voltage at end provides work electricity by the first voltage output end for the driving chip of the AMOLED display panel
Pressure.
5. power control circuit according to claim 4, which is characterized in that second peripheral circuit includes being series at institute
State the first resistor and second resistance between first voltage output end and grounding point；
The Voltage Feedback pin of the second source chip is connected between the first resistor and the second resistance, and described
Two power supply chips are used to set the output electricity of the first voltage output end by the first resistor and the second resistance
Pressure.
6. power control circuit according to claim 4, which is characterized in that second peripheral circuit is also used to described
The output voltage of 4th output pin is converted, and the output voltage of second voltage output end, the second voltage output are obtained
End is electrically connected with the voltage input end of the first peripheral circuit.
7. power control circuit according to claim 6, which is characterized in that second peripheral circuit includes being series at institute
State the 3rd resistor and the 4th resistance between first voltage output end and grounding point；The second voltage output end is connected to described
Between 3rd resistor and the 4th resistance.
8. power control circuit according to claim 5, which is characterized in that second peripheral circuit further includes being series at
Capacitor between the first voltage output end and grounding point.
9. power control circuit according to claim 5, which is characterized in that the overcurrent protection of the second source chip is drawn
Foot is used to be arranged the soft start speed of the second source chip by the 5th resistance eutral grounding, the 5th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820817049.XU CN208157021U (en) | 2018-05-29 | 2018-05-29 | A kind of power control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820817049.XU CN208157021U (en) | 2018-05-29 | 2018-05-29 | A kind of power control circuit |
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| CN208157021U true CN208157021U (en) | 2018-11-27 |
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| CN201820817049.XU Active CN208157021U (en) | 2018-05-29 | 2018-05-29 | A kind of power control circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109545139A (en) * | 2018-12-13 | 2019-03-29 | 昆山国显光电有限公司 | Pixel compensation circuit, method and display device |
| WO2021208782A1 (en) * | 2020-04-14 | 2021-10-21 | 咸阳彩虹光电科技有限公司 | Liquid crystal display panel drive apparatus and liquid crystal display apparatus |
| WO2022033159A1 (en) * | 2020-08-12 | 2022-02-17 | Oppo广东移动通信有限公司 | Power source apparatus, electronic device, power supply method and apparatus, and computer-readable medium |
| CN114882840A (en) * | 2022-06-18 | 2022-08-09 | 广东省魔丽显示科技有限公司 | Display panel driving power supply circuit |
-
2018
- 2018-05-29 CN CN201820817049.XU patent/CN208157021U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109545139A (en) * | 2018-12-13 | 2019-03-29 | 昆山国显光电有限公司 | Pixel compensation circuit, method and display device |
| WO2021208782A1 (en) * | 2020-04-14 | 2021-10-21 | 咸阳彩虹光电科技有限公司 | Liquid crystal display panel drive apparatus and liquid crystal display apparatus |
| WO2022033159A1 (en) * | 2020-08-12 | 2022-02-17 | Oppo广东移动通信有限公司 | Power source apparatus, electronic device, power supply method and apparatus, and computer-readable medium |
| CN114882840A (en) * | 2022-06-18 | 2022-08-09 | 广东省魔丽显示科技有限公司 | Display panel driving power supply circuit |
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Address after: 201506, No. nine, No. 1568, Jinshan Industrial Zone, Shanghai, Jinshan District Patentee after: Shanghai Hehui optoelectronic Co., Ltd Address before: 201506, No. nine, No. 1568, Jinshan Industrial Zone, Shanghai, Jinshan District Patentee before: EverDisplay Optronics (Shanghai) Ltd. |