CN107742874A - A kind of power management integrated circuit and the liquid crystal display panel using the circuit - Google Patents
A kind of power management integrated circuit and the liquid crystal display panel using the circuit Download PDFInfo
- Publication number
- CN107742874A CN107742874A CN201710888992.XA CN201710888992A CN107742874A CN 107742874 A CN107742874 A CN 107742874A CN 201710888992 A CN201710888992 A CN 201710888992A CN 107742874 A CN107742874 A CN 107742874A
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- China
- Prior art keywords
- power management
- integration module
- control
- humidity
- integrated circuit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
Abstract
The invention discloses a kind of power management integrated circuit, and it includes a power management integration module and a control module；The control module is electrically connected to the power management integration module, the control module is used to detect ambient humidity, and when ambient humidity is less than or equal to default humidity threshold, the first control signal is sent to the power management integration module, and when ambient humidity is more than default humidity threshold, the second control signal is sent to the power management integration module；The power management integration module is used for when receiving the first control signal, normal output voltage, and for when receiving the second control signal, stopping output voltage.The present invention can be realized under normal humidity environment, power management integrated circuit can normal High voltage output, and when ambient humidity is more than a default humidity, power management integrated circuit stops High voltage output, to avoid causing the damage of IC.
Description
Technical field
The present invention relates to liquid panel technique field, more particularly to a kind of power management integrated circuit and using the circuit
Liquid crystal display panel.
Background technology
Thin Film Transistor-LCD (Thin film transistor liquid crystal display, referred to as
For TFT-LCD) be most liquid crystal displays one kind, it is using thin-film transistor technologies to improve image quality.
At present, the input voltage of LCD drive circuits is usually 12V, is then turned input voltage by DC/DC module architectures
Change LCD into and show required various magnitudes of voltage.Present LCD shows the upper voltage limit that required voltage has liquid crystal drive to export
VAA (15V or so), the lower voltage limit VBB (ground connection) of liquid crystal drive output, VDD (are usually 3.3V, are the one of such as EEPROM
The operating voltage of the logic circuit of a little integrated circuits (IC)), TFT gate off voltage VGL (being usually -6V or so), TFT
Gate-on voltage VGH (being usually 33V left).
When TFT-LCD at work, power management integrated circuit (Power Management integrated
Circuit, abbreviation PMIC, it is a kind of integrated circuit of special-purpose, and makees the work such as management power supply for main system) can be defeated
Go out two high voltages, respectively VAA and VGH, i.e. liquid crystal drive output upper voltage limit and gate-on voltage.
However, when being worked in the case that many high tension voltages are higher in ambient humidity, easily cause IC
Damage, or even effectively cause the failure of whole liquid crystal display device.
Therefore, how under normal humidity environment, power management integrated circuit can be exported normally, and when ambient humidity exceedes
During one default humidity, power management integrated circuit stops High voltage output, to avoid causing the damage of IC, this into
One important subject.
The content of the invention
It is an object of the present invention to provide a kind of power management integrated circuit, and it can be realized under normal humidity environment,
Power management integrated circuit can normal High voltage output, and when ambient humidity is more than a default humidity, power management integrated circuit
Stop High voltage output, to avoid causing the damage of IC.
To achieve these goals, the present invention provides following technical scheme.
The present invention provides a kind of power management integrated circuit, and it includes a power management integration module and a control module；
The control module is electrically connected to the power management integration module, and the control module is used to detecting ambient humidity, and
When ambient humidity is less than or equal to default humidity threshold, the first control signal is sent to the power management integration module, and
When ambient humidity is more than default humidity threshold, the second control signal is sent to the power management integration module；The electricity
Source control integration module is used for when receiving the first control signal, normal output voltage, and for receiving the second control
During signal, stop output voltage.
In one embodiment of this invention, the control module includes a humidity detection unit and the Humidity Detection list
One switch element of member connection, the switch element are also connected with power management integration module, and the humidity detection unit is used to examine
Survey ambient humidity, when the ambient humidity is less than or equal to default humidity threshold, control switch element cut-off, with to
The power management integration module sends the first control signal, and when the ambient humidity is more than default humidity threshold, control
Switching means conductive processed, to send the second control signal to the power management integration module.
In one embodiment of this invention, the humidity detection unit includes first resistor, second resistance, humistor,
The switch element includes a metal-oxide-semiconductor；Wherein, one end of the first resistor is respectively and electrically connected to the power management and integrated
First output end of module and one end of the second resistance；The other end of the second resistance is respectively and electrically connected to described
One end of the grid of metal-oxide-semiconductor and the 3rd resistor；The 3rd resistor is humistor, the other end of the 3rd resistor
Ground connection；The source class ground connection of the metal-oxide-semiconductor, the drain electrode of the metal-oxide-semiconductor be respectively and electrically connected to the first resistor the other end and
The power management integration module.
In one embodiment of this invention, the power management integration module includes a control pin, the control pin
Drain electrode with the metal-oxide-semiconductor is electrically connected with, and the control pin is used to receive the first control letter that the control module is sent
Number and second control control signal.
In one embodiment of this invention, the output of the first output end of the power management integration module includes one first
Low-voltage.
Optionally, first low-voltage is 3.3V.
In addition, the present invention also provides a kind of liquid crystal display panel, the liquid crystal display panel includes above-mentioned Novel electric source capsule
Manage integrated circuit.
It is an advantage of the current invention that the power management integrated circuit of the present invention is by using structures such as humistor and metal-oxide-semiconductors
Into control module detect ambient humidity, and realize under normal humidity environment, power management integrated circuit can normal height
Pressure output, and when ambient humidity is more than a default humidity, power management integrated circuit stops High voltage output, to avoid causing collecting
Into the damage of IC circuit.
Brief description of the drawings
Fig. 1 is the block schematic illustration of power management integrated circuit of the present invention.
Fig. 2 is the circuit connection diagram of power management integrated circuit of the present invention.
Embodiment
The embodiment of power management integrated circuit provided by the invention is elaborated below in conjunction with the accompanying drawings.
Referring to shown in Fig. 1 and Fig. 2, power management integrated circuit of the present invention includes a power management integration module 110 and one
Control module 120.The power management integration module 110 is used to provide supply voltage and power management to liquid crystal display panel.
The control module 120 is electrically connected to the power management integration module 110, and the control module 120 is used to detect environment
Humidity, and when ambient humidity is less than or equal to default humidity threshold, first is sent to the power management integration module 110
Control signal, and when ambient humidity is more than default humidity threshold, the second control is sent to the power management integration module 110
Signal processed.The power management integration module is additionally operable to when receiving the first control signal, and normal output voltage is (for example, VAA
Upper voltage limit and VGH gate-on voltages), and for when receiving the second control signal, stopping output voltage.
And it will be explained in annexation and the effect of each component in power management integrated circuit.
In the present embodiment, the power management integration module 110 include a power management integrated circuit (i.e. PMIC) with
And one control pin.The control pin EN is connected with a drain electrode of the metal-oxide-semiconductor in the switch element of the control module 120,
It is described below.The control pin EN is used to receive the first control signal and second that the control module 120 is sent
Control control signal.
With continued reference to shown in Fig. 1 and Fig. 2, in the present embodiment, the control module 120 includes：One humidity detection unit
121st, the switch element 122 being connected with the humidity detection unit 121, the switch element 122 are also connected with power management collection
Into module 110, the humidity detection unit 121 is used to detect ambient humidity, is less than or equal in the ambient humidity default
During humidity threshold, control the switch element 122 to end, believed with sending the first control to the power management integration module 110
Number, and when the ambient humidity is more than default humidity threshold, controlling switch unit 122 turns on, with to the power management
Integration module 110 sends the second control signal.
Wherein, the humidity detection unit 121 includes：First resistor R1, second resistance R2, humistor R3, it is described to open
Closing unit 122 includes a metal-oxide-semiconductor Q1.One end of the first resistor R1 is respectively and electrically connected to the power management integration module
One end of 110 the first output end and the second resistance R2；The other end of the second resistance R2 is respectively and electrically connected to
One end of the grid of the metal-oxide-semiconductor Q1 and the 3rd resistor R3；The other end ground connection of the 3rd resistor R3；The MOS
Pipe Q1 source class ground connection, the drain electrode of the metal-oxide-semiconductor Q1 are respectively and electrically connected to the other end of the first resistor R1 and the electricity
Source control integration module 110.
Furthermore, the 3rd resistor R3 is humistor, and the humistor is according to real-time ambient humidity
It is worth and change in resistance occurs, generates corresponding detection magnitude of voltage in real time.
The metal-oxide-semiconductor Q1 can provide a voltage threshold, with compared with the magnitude of voltage of detection in real time.Therefore, in institute
When stating ambient humidity and being less than or equal to default humidity threshold, the humidity detection unit 121 is controlled in the switch element 122
Metal-oxide-semiconductor Q1 cut-off (i.e. it is described in real time detect magnitude of voltage be less than voltage threshold), to be sent out to the power management integration module 110
Send the first control signal.When the ambient humidity is more than default humidity threshold, the controlling switch of humidity detection unit 121
Metal-oxide-semiconductor Q1 conductings (the i.e. described magnitude of voltage of detection in real time is more than voltage threshold) in unit 122, to be integrated to the power management
Module sends the second control signal.
With continued reference to Fig. 1 and Fig. 2, the power management integration module include control pin EN, the control pin EN and
The drain electrode of the metal-oxide-semiconductor Q1 is electrically connected with, and the control pin EN is used to receive the first control that the control module is sent
Signal and the second control control signal.When the control pin EN receives the first control signal (high level), it is allowed to described
Power management integration module 110 exports the high voltages such as VAA, VGH.As the control pin EN, to receive the second control signal (low
Level) when so that the power management integration module 110 does not export the high voltages such as VAA, VGH.Therefore, the control pin EN
It is considered as whether the control power management integration module 110 exports the high-tension pin such as VAA, VGH.
In addition, the output of the first output end of the power management integration module 110 includes one first low-voltage, first is low
Voltage is 3.3V, but not limited to this, or other low voltage values.It is described when power management integration module 110 is once energization
First output end just exports a low-voltage.
In the present embodiment, the cut-in voltage of the metal-oxide-semiconductor Q1 is VT, as voltages described above threshold value.
When under normal humidity environment, setting second resistance R2 and 3rd resistor R3 resistance is wet in home to cause
Under degree, second resistance R2 and 3rd resistor R3 are less than institute by the voltage of first low-voltage (being herein 3.3V) point to A points
State metal-oxide-semiconductor Q1 cut-in voltage VT, the now metal-oxide-semiconductor Q1 cut-offs, then, the control pin EN receives the first control letter
Number (it is high level), the power management integration module 110 normally export, that is, export the high voltages such as VAA, VGH.
When ambient humidity exceedes default humidity threshold (that is, humidity that integrated circuit can be caused to damage), the second electricity
R2 and 3rd resistor R3 is hindered by the voltage of first low-voltage (being herein 3.3V) point to A points more than the metal-oxide-semiconductor Q1's
Cut-in voltage VT, the now metal-oxide-semiconductor Q1 conductings, then, the control pin EN receives the second control signal, and (it is low electricity
It is flat), the power management integration module 110 stops output voltage, so as to avoid integrated circuit from damaging (or burning out).
The present invention also provides a kind of liquid crystal display panel, and the liquid crystal display panel includes the integrated electricity of above-mentioned power management
Road.It is therefore, no longer superfluous due to the concrete structure and function of the novel power supply management integrated circuit being described in detail above
State.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (7)
1. a kind of power management integrated circuit, it is characterised in that including a power management integration module and a control module；It is described
Control module is electrically connected to the power management integration module, and the control module is used to detect ambient humidity, and in environment
When humidity is less than or equal to default humidity threshold, the first control signal is sent to the power management integration module, and in ring
When border humidity is more than default humidity threshold, the second control signal is sent to the power management integration module；The power supply pipe
Manage integration module to be used for when receiving the first control signal, normal output voltage, and for receiving the second control signal
When, stop output voltage.
2. power management integrated circuit according to claim 1, it is characterised in that the control module is examined including a humidity
The switch element for survey unit, being connected with the humidity detection unit, the switch element are also connected with power management integration module,
The humidity detection unit is used to detect ambient humidity, when the ambient humidity is less than or equal to default humidity threshold, control
The switch element cut-off is made, to send the first control signal to the power management integration module, and in the ambient humidity
During more than default humidity threshold, the conducting of controlling switch unit, believed with sending the second control to the power management integration module
Number.
3. power management integrated circuit according to claim 2, it is characterised in that the humidity detection unit includes first
Resistance, second resistance, humistor, the switch element include a metal-oxide-semiconductor；Wherein, one end of the first resistor is electric respectively
Property is connected to the first output end of the power management integration module and one end of the second resistance；The second resistance
The other end is respectively and electrically connected to the grid of the metal-oxide-semiconductor and one end of the 3rd resistor；The 3rd resistor is wet sensitive
Resistance, the other end ground connection of the 3rd resistor；The source class ground connection of the metal-oxide-semiconductor, the drain electrode of the metal-oxide-semiconductor are electrically connected
The other end and the power management integration module to the first resistor.
4. power management integrated circuit according to claim 3, it is characterised in that the power management integration module includes
One control pin, the drain electrode of the control pin and the metal-oxide-semiconductor are electrically connected with, and the control pin is used to receive the control
The first control signal and the second control control signal that module is sent.
5. power management integrated circuit according to claim 3, it is characterised in that the of the power management integration module
The output of one output end includes one first low-voltage.
6. power management integrated circuit according to claim 5, it is characterised in that first low-voltage is 3.3V.
7. a kind of liquid crystal display panel, it is characterised in that the liquid crystal display panel is included in claim 1 to claim 6
Any power management integrated circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710888992.XA CN107742874A (en) | 2017-09-27 | 2017-09-27 | A kind of power management integrated circuit and the liquid crystal display panel using the circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710888992.XA CN107742874A (en) | 2017-09-27 | 2017-09-27 | A kind of power management integrated circuit and the liquid crystal display panel using the circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107742874A true CN107742874A (en) | 2018-02-27 |
Family
ID=61236067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710888992.XA Pending CN107742874A (en) | 2017-09-27 | 2017-09-27 | A kind of power management integrated circuit and the liquid crystal display panel using the circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107742874A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203536944U (en) * | 2013-11-01 | 2014-04-09 | 江苏海事职业技术学院 | A cell phone waterproof protection circuit |
| EP2117095B1 (en) * | 2008-05-06 | 2014-07-16 | Continental Automotive GmbH | Moisture protection circuit |
| CN105183121A (en) * | 2014-06-14 | 2015-12-23 | 联想（新加坡）私人有限公司 | Method for improving safety of voltage regulator |
-
2017
- 2017-09-27 CN CN201710888992.XA patent/CN107742874A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2117095B1 (en) * | 2008-05-06 | 2014-07-16 | Continental Automotive GmbH | Moisture protection circuit |
| CN203536944U (en) * | 2013-11-01 | 2014-04-09 | 江苏海事职业技术学院 | A cell phone waterproof protection circuit |
| CN105183121A (en) * | 2014-06-14 | 2015-12-23 | 联想（新加坡）私人有限公司 | Method for improving safety of voltage regulator |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180227 |
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| RJ01 | Rejection of invention patent application after publication |