CN105845068B - A kind of power supply circuit of source drive module, display panel and display device - Google Patents
A kind of power supply circuit of source drive module, display panel and display device Download PDFInfo
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- CN105845068B CN105845068B CN201610425366.2A CN201610425366A CN105845068B CN 105845068 B CN105845068 B CN 105845068B CN 201610425366 A CN201610425366 A CN 201610425366A CN 105845068 B CN105845068 B CN 105845068B
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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
- G09G3/2007—Display of intermediate tones
- G09G3/2077—Display of intermediate tones by a combination of two or more gradation control methods
Abstract
The invention discloses a kind of power supply circuit of source drive module, display panel and display device, with to avoid in power supply circuit as supply voltage is too large or too small and caused by source drive module the bad phenomenons such as burn.The power supply circuit includes：First voltage comparison module, second voltage comparison module and switch control module；First voltage comparison module, when determining that analog voltage signal is greater than or equal to the reference voltage of analog voltage, exports the first signal to switch control module for being compared to analog voltage signal with the size of the reference voltage of analog voltage；Second voltage comparison module, when determining that digital voltage signal is less than or equal to the reference voltage of the digital voltage, exports third signal to switch control module for being compared to digital voltage signal with the size of the reference voltage of digital voltage；Switch control module is used for when receiving the first signal or third signal, stops output analog voltage signal.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of power supply circuit of source drive module, display panel and
Display device.
Background technique
There are a designs for source drive module (Source Driver IC) used in the product of display equipment at present
Defect works as satisfaction that is, to digital operation voltage VDD in the duplex feeding voltage of source drive module and simulation operating voltage AVDD
VDD<VDD_min or AVDD>When AVDD_max, AVDD can generate a biggish electric current, lead to the line of source drive module
Road is burned out, wherein VDD_min is the minimum value of digital operation voltage, and AVDD_max is the maximum value for simulating operating voltage.
Specifically, the case where causing the route of source drive module to be burned out include：1, when showing equipment shutdown, referring to
Fig. 1, VDD power down, so that VDD<VDD_min, switch K1 is closed at this time, and each channel of source electrode can bleed off residual charge over the ground, make
Forming circuit is connected with VDD for the power supply circuit for obtaining AVDD, and generates high current, and the route of source drive module is caused to be burned out；
Alternatively, when the voltage of AVDD is to be boosted by VDD and is generated, when showing that equipment is shut down, the voltage value of AVDD with VDD decline
Slowly it is gradually reduced, and when shutdown moment XON is opened, there is instantaneous drop-down in VDD, and will lead to AVDD high current occurs, or
When power supply shakiness occurs at work in display screen, and VDD is caused to pull down, AVDD can also have the risk of high current.2, when display is set
Standby AVDD power supply is not converted by VDD, when being powered by external circuit, if livewire work Plug Action occurs, or
Connector dislocation, can lead to AVDD high voltage, equally by higher voltage such as VGH signal loading in the power supply of the AVDD
The route that will lead to source drive module is burned out.
Therefore, with increase or livewire work Plug Action of the number of the switching on and shutting down of display equipment etc., so that AVDD
Voltage increase and generate excessive electric current the route of source drive module is caused to be burned out, have serious shadow to the reliability of product
It rings.
Summary of the invention
The present invention provides the power supply circuit, display panel and display device of a kind of source drive module, with to avoid power supply
In circuit as supply voltage is too large or too small and caused by source drive module the bad phenomenons such as burn.
A kind of power supply circuit of source drive module provided in an embodiment of the present invention includes：First voltage comparison module,
Two voltage comparison modules and switch control module；
Wherein, the first voltage comparison module is used for the size to the reference voltage of analog voltage signal and analog voltage
It is compared, when determining that the analog voltage signal is greater than or equal to the reference voltage of the analog voltage, the first letter of output
Number the switch control module is given, otherwise, export second signal to the switch control module；
The second voltage comparison module is used to carry out the size of the reference voltage of digital voltage signal and digital voltage
Compare, when determine the digital voltage signal be less than or equal to the digital voltage reference voltage when, export third signal to
Otherwise the switch control module exports fourth signal to the switch control module；
The switch control module is used for when receiving the second signal and fourth signal, exports the analog voltage
Signal is to source drive module, when receiving first signal or third signal, stops exporting the analog voltage signal
To source drive module.
In a kind of possible embodiment, the power supply circuit of above-mentioned source drive module provided in an embodiment of the present invention
In, the first input end of the first voltage comparison module connects the output end of the analog voltage signal, the second input terminal
The output end of the reference voltage of the analog voltage is connected, the output end of the first voltage comparison module connects the switch control
The first input end of molding block；
The first input end of the second voltage comparison module connects the output end of the digital voltage signal, and second is defeated
Enter the output end that end connects the reference voltage of the digital voltage, is opened described in the output end connection of the second voltage comparison module
Close the second input terminal of control module；
The first input end of the switch control module connects the output end of the first voltage comparison module, and second is defeated
Enter the output end that end connects the second voltage comparison module, third input terminal connects the output of the analog voltage signal
End, the first output end of the switch control module connect the input terminal of the source drive module.
In a kind of possible embodiment, the power supply circuit of above-mentioned source drive module provided in an embodiment of the present invention
In, the first voltage comparison module includes：
First comparator, the reverse input end of the first comparator connect first resistor, positive input connection the
Two resistance, output end of the output end as the first voltage comparison module；
First resistor, first input end of the first end of the first resistor as the first voltage comparison module, separately
One end connects the reverse input end of the first comparator；
Second resistance, second input terminal of the first end of the second resistance as the first voltage comparison module, separately
One end connects the positive input of the first comparator；
3rd resistor, the 3rd resistor are connected between the positive input and ground of the first comparator；
4th resistance, the 4th resistance are connected between the reverse input end and output end of the first comparator.
In a kind of possible embodiment, the power supply circuit of above-mentioned source drive module provided in an embodiment of the present invention
In, the second voltage comparison module includes：
Second comparator, the positive input of second comparator connect the 5th resistance, reverse input end connection the
Six resistance, output end of the output end as the second voltage comparison module；
5th resistance, first input end of the first end of the 5th resistance as the second voltage comparison module, separately
One end connects the positive input of second comparator；
6th resistance, second input terminal of the first end of the 6th resistance as the second voltage comparison module, separately
One end connects the reverse input end of second comparator；
7th resistance, the 7th resistance are connected between the positive input and ground of second comparator；
8th resistance, the 8th resistance are connected between the reverse input end and output end of second comparator.
In a kind of possible embodiment, the power supply circuit of above-mentioned source drive module provided in an embodiment of the present invention
In, the switch control module includes：
With door, the first input end with the first input end of door as the switch control module, the second input
The second input terminal as the switch control module is held, output end connects the control terminal of first switch device；
First switch device, third input terminal of the input terminal as the switch control module, control terminal connect institute
State the output end with door, first output end of the output end of the first switch device as the switch control module.
In a kind of possible embodiment, the power supply circuit of above-mentioned source drive module provided in an embodiment of the present invention
In, the first switch device is thin film transistor (TFT).
In a kind of possible embodiment, the power supply circuit of above-mentioned source drive module provided in an embodiment of the present invention
In, the switch control module is also used to when receiving the second signal and fourth signal, exports the digital voltage letter
Number give source drive module, when receiving first signal or third signal, stopping export the digital voltage signal to
The source drive module.
In a kind of possible embodiment, the power supply circuit of above-mentioned source drive module provided in an embodiment of the present invention
In, the 4th input terminal of the switch control module connects the output end of the digital voltage signal, the switch control module
Second output terminal connect the input terminal of the source drive module.
In a kind of possible embodiment, the power supply circuit of above-mentioned source drive module provided in an embodiment of the present invention
In, the switch control module further includes：
Second switch device, fourth input terminal of the input terminal as the switch control module, control terminal connect institute
State the output end with door, second output terminal of the output end of the second switch device as the switch control module.
In a kind of possible embodiment, the power supply circuit of above-mentioned source drive module provided in an embodiment of the present invention
In, the second switch device is thin film transistor (TFT).
Correspondingly, the embodiment of the invention also provides a kind of display panel, including it is provided in an embodiment of the present invention any
Source drive module power supply circuit.
Correspondingly, the embodiment of the invention also provides a kind of display devices, including provided in an embodiment of the present invention above-mentioned
Display panel.
The present invention has the beneficial effect that：
Power supply circuit, display panel and the display device of a kind of source drive module provided in an embodiment of the present invention, it is described
Power supply circuit includes：First voltage comparison module, second voltage comparison module and switch control module；Wherein, first electricity
Pressure comparison module is for being compared analog voltage signal with the size of the reference voltage of analog voltage, when determining the simulation
When voltage signal is greater than or equal to the reference voltage of the analog voltage, export the first signal to the switch control module, it is no
Then, second signal is exported to the switch control module；The second voltage comparison module is used for digital voltage signal and number
The size of the reference voltage of word voltage is compared, when determining that the digital voltage signal is less than or equal to the digital voltage
When reference voltage, third signal is exported to the switch control module, otherwise, exports fourth signal to the switch control mould
Block；The switch control module is used for when receiving the second signal and fourth signal, exports the analog voltage signal
To source drive module, when receiving first signal or third signal, stopping exports the analog voltage signal to source
Pole drive module.Therefore, in the power supply circuit of the source drive module provided in the embodiment of the present invention, compared by first voltage
Detection of the module to analog voltage signal, and the detection by second voltage comparison module to digital voltage signal, work as determination
When analog voltage signal is greater than or equal to the reference voltage of analog voltage, or determine that digital voltage signal is less than or equal to number
When the reference voltage of voltage, stopping export analog voltage signal to source drive module, avoid due to analog voltage signal and
Circuit is generated between digital voltage signal, that causes source drive module burns phenomenon.
Detailed description of the invention
Fig. 1 is a kind of structure chart of the power supply circuit for source drive module that the prior art provides；
Fig. 2 is a kind of structural schematic diagram of the power supply circuit of source drive module provided in an embodiment of the present invention；
Fig. 3 is a kind of concrete structure schematic diagram of the power supply circuit of source drive module provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of the power supply circuit of second of source drive module provided in an embodiment of the present invention；
Fig. 5 is the concrete structure schematic diagram of the power supply circuit of second of source drive module provided in an embodiment of the present invention；
Fig. 6 is the concrete structure schematic diagram of the power supply circuit of the third source drive module provided in an embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a kind of power supply circuit of source drive module, display panel and display device, to
Avoid in power supply circuit as supply voltage is too large or too small and caused by source drive module the bad phenomenons such as burn.
With reference to the accompanying drawing, to the power supply circuit of source drive module provided in an embodiment of the present invention, display panel and aobvious
The specific embodiment of showing device is described in detail.
Referring to fig. 2, a kind of power supply circuit of source drive module provided in an embodiment of the present invention includes：First voltage compares
Module 21, second voltage comparison module 22, switch control module 23 and source drive module 24；
Wherein, first voltage comparison module 21 is used for the reference voltage to analog voltage signal AVDD and analog voltage
The size of AVDD_max is compared, when determine analog voltage signal AVDD be greater than or equal to analog voltage reference voltage
When AVDD_max, the first signal V1 is exported to switch control module 23, otherwise, exports second signal V2 to switch control module
23；
Second voltage comparison module 22 is used for the reference voltage VDD_min's of digital voltage signal VDD and digital voltage
Size is compared, when determining that digital voltage signal VDD is less than or equal to the reference voltage VDD_min of digital voltage, output
Third signal V3 is to switch control module 23, otherwise, exports fourth signal V4 to switch control module 23；
Switch control module 23 is used for when receiving second signal V2 and fourth signal V4, exports analog voltage signal
AVDD is to source drive module 24, when receiving the first signal V1 or third signal V3, stops output analog voltage signal
AVDD is to source drive module 24.
It should be noted that analog voltage signal is the simulation for inputting to source drive module in the embodiment of the present invention
Operating voltage signal AVDD, the reference voltage of analog voltage refer to the maximum simulation work for inputting to source drive module
Voltage AVDD_max, wherein the value of AVDD_max be can be former with the work of the source drive module in the display product of different model
Reason obtains, and occurrence is it is not limited here.Digital voltage signal is the digital operation voltage for inputting to source drive module
The value of VDD, the reference voltage of digital voltage refer to the smallest digital operation voltage VDD_ for inputting to source drive module
Min, wherein the value of VDD_min is can be obtained with the working principle of the source drive module in the display product of different model, tool
Body value is it is not limited here.
A kind of power supply circuit of source drive module provided in an embodiment of the present invention includes：First voltage comparison module,
Two voltage comparison modules, switch control module and source drive module；Wherein, the first voltage comparison module is used for simulation
Voltage signal is compared with the size of the reference voltage of analog voltage, when determine the analog voltage signal be greater than or equal to institute
When stating the reference voltage of analog voltage, the first signal is exported to the switch control module, otherwise, exports second signal to described
Switch control module；The second voltage comparison module is used for the size to the reference voltage of digital voltage signal and digital voltage
It is compared, when determining that the digital voltage signal is less than or equal to the reference voltage of the digital voltage, output third letter
Number the switch control module is given, otherwise, export fourth signal to the switch control module；The switch control module is used for
When receiving first signal or third signal, stopping exports the analog voltage signal to source drive module.Therefore,
In the power supply circuit of the source drive module provided in the embodiment of the present invention, analog voltage is believed by first voltage comparison module
Number detection, and the detection by second voltage comparison module to digital voltage signal, when determining that analog voltage signal is greater than
Or equal to analog voltage reference voltage when, or determine digital voltage signal be less than or equal to digital voltage reference voltage
When, stopping export analog voltage signal to source drive module, avoid due to analog voltage signal and digital voltage signal it
Between generate circuit, that causes source drive module burns phenomenon.
In order to further describe the power supply circuit of source drive module provided in an embodiment of the present invention, referring to fig. 2, the present invention
In the power supply circuit for the above-mentioned source drive module that embodiment provides, the first input end of first voltage comparison module 21 connects mould
The output end of quasi- voltage signal AVDD, the output end of the reference voltage AVDD_max of the second input terminal connecting analog voltage, the
The first input end of the output end connection switch control module 23 of one voltage comparison module 21；The of second voltage comparison module 22
One input terminal connects the output end of digital voltage signal VDD, and the second input terminal connects the reference voltage VDD_min of digital voltage
Output end, the second input terminal of the output end connection switch control module 23 of second voltage comparison module 22；Switch control mould
The output end of the first input end connection first voltage comparison module 21 of block 23, the second input terminal connection second voltage compare mould
The output end of block 22, the output end of third input terminal connecting analog voltage signal AVDD, the first of switch control module 23 are defeated
The input terminal of outlet connection source drive module 24.
Combined with specific embodiments below, the present invention is described in detail.It should be noted that be in the present embodiment in order to
It preferably explains the present invention, but does not limit the present invention.
Preferably, in the power supply circuit of above-mentioned source drive module provided in an embodiment of the present invention, referring to Fig. 3, the first electricity
Pressure comparison module 21 include：
First comparator COM1, reverse input end (-) connection first resistor R1 of first comparator, positive input
(+) connects second resistance R2, output end of the output end as first voltage comparison module；
First resistor R1, first input end of the first end of first resistor as first voltage comparison module, the other end connect
Connect the reverse input end (-) of first comparator COM1；
Second resistance R2, second input terminal of the first end of second resistance as first voltage comparison module, the other end connect
Connect the positive input (+) of first comparator COM1；
3rd resistor R3,3rd resistor are connected between the positive input (+) of first comparator COM1 and ground GND；
4th resistance R4, the 4th resistance are connected between the reverse input end (-) of first comparator COM1 and output end.
Further, in specific embodiment, as shown in figure 3, according to the working principle of first comparator, if first compares
The voltage of the positive input input of device is greater than the voltage value that the reverse input end of first comparator inputs, then output end output is high
Level, if the voltage that the positive input of first comparator inputs is less than the voltage of the reverse input end input terminal of first comparator
Value, then output end exports low level.Wherein, the first signal V1 is that first comparator output end exports low level, second signal V2
High level is exported for the output end of first comparator.
Specifically, in the power supply circuit of above-mentioned source drive module provided in an embodiment of the present invention, first comparator is just
To the reference voltage AVDD_max of input terminal input analog voltage, the reverse input end input analog voltage signal of first comparator
AVDD, if AVDD_max >=AVDD, output end UI > 0 is second signal V2；If AVDD_max < AVDD, output end UI
< 0 is the first signal V1.
Wherein, the positive input of first comparator corresponds to the first input end of first voltage comparison module, can also be right
Answer the second input terminal of first voltage comparison module, the i.e. reference voltage of the positive input input analog voltage of first comparator
AVDD_max, the reverse input end input analog voltage signal AVDD of first comparator；Alternatively, the reversed input of first comparator
Hold the reference voltage AVDD_max, the positive input input analog voltage signal AVDD of first comparator of input analog voltage.
It is not specifically limited herein.
The above is only the specific structures for illustrating first voltage comparison module in power supply circuit, in the specific implementation, the
The specific structure of one voltage comparison module is not limited to above structure provided in an embodiment of the present invention, can also be those skilled in the art
Other structures known to member, it is not limited here.
Preferably, in the power supply circuit of above-mentioned source drive module provided in an embodiment of the present invention, referring to Fig. 3, the second electricity
Pressure comparison module 22 include：
Second comparator COM2, positive input (+) the 5th resistance R5 of connection of the second comparator, reverse input end
(-) connects the 6th resistance R6, output end of the output end as second voltage comparison module；
5th resistance R5, first input end of the first end of the 5th resistance as second voltage comparison module, the other end connect
Connect the positive input (+) of the second comparator；
6th resistance R6, second input terminal of the first end of the 6th resistance as second voltage comparison module, the other end connect
Connect the reverse input end (-) of the second comparator；
7th resistance R7, the 7th resistance are connected between the positive input (+) of the second comparator COM2 and ground GND；
8th resistance R8, the 8th resistance are connected between the reverse input end (-) and output end of the second comparator COM2.
Further, in specific embodiment, according to the working principle of the second comparator, if the forward direction of the second comparator is defeated
The voltage for entering end input is greater than the voltage value that the reverse input end of the second comparator inputs, then output end exports high level, if the
The voltage of the positive input input of two comparators is then exported less than the voltage value of the reverse input end input terminal of the second comparator
End output low level.Wherein, in the embodiment of the present invention, third signal V3 be the second comparator output terminal export low level, the 4th
Signal V4 is that the output end of the second comparator exports high level.
Specifically, in the power supply circuit of above-mentioned source drive module provided in an embodiment of the present invention, as shown in figure 3, second
The positive input of comparator inputs digital voltage signal VDD, the ginseng of the reverse input end input digital voltage of the second comparator
Voltage VDD_min is examined, if VDD >=VDD_min, output end U2 > 0 is fourth signal V4；If VDD < VDD_min, exports
UI < 0 is held, is third signal V3.
Wherein, the positive input of the second comparator corresponds to the first input end of second voltage comparison module, can also be right
Answer the second input terminal of second voltage comparison module, i.e. the positive input of the second comparator inputs digital voltage signal VDD, the
The reference voltage VDD_min of the reverse input end input digital voltage of two comparators；Alternatively, the reverse input end of the second comparator
Input digital voltage signal VDD, the reference voltage VDD_min of the positive input input digital voltage of the second comparator.Herein
It is not specifically limited.
The above is only the specific structures for illustrating second voltage comparison module in power supply circuit, in the specific implementation, the
The specific structure of two voltage comparison modules is not limited to above structure provided in an embodiment of the present invention, can also be those skilled in the art
Other structures known to member, it is not limited here.
Preferably, in the power supply circuit of above-mentioned source drive module provided in an embodiment of the present invention, referring to Fig. 3, switch control
Molding block 23 includes：
With door AND, first input end with the first input end of door AND as switch control module 23, the second input
The second input terminal as switch control module is held, output end connects the control terminal of first switch device T1；
First switch device T1, third input terminal of the input terminal as switch control module 23, control terminal connection with
The output end of door AND, first output end of the output end of first switch device T1 as switch control module 23.
Further, in specific embodiment, according to the working principle with door, when with two input terminals in door, as long as
The data for having an input terminal to input are less than 0, then the value with the output end of door is less than 0.When defeated with two input terminals in door
Data out are greater than 0, then are greater than 0 with the value of the output end of door.
Specifically, it as the first signal V1 that the output end for receiving first comparator exports, and/or receives second and compares
When the third signal V3 of the output end output of device, low level is exported with the output end of door.When the output end for receiving first comparator
The second signal V2 of output, and receive the second comparator output end output fourth signal V4 when, it is defeated with the output end of door
High level out.
Preferably, in the power supply circuit of above-mentioned source drive module provided in an embodiment of the present invention, first switch device T1
It can be thin film transistor (TFT) or other switching devices with switching function.Wherein, first switch device T1 can be N-type
Transistor, when exporting high level with door, then first switch break-over of device, when exporting low level with door, then first switch device is cut
Only；Or first switch device T1 is P-type transistor, when exporting high level with door, then first switch device ends, when defeated with door
High level out, then first switch break-over of device.It is not limited thereto.
Specifically, when first switch device is in the conductive state, then analog voltage signal is exported to source drive module；
When first switch device is in off state, stopping exports analog voltage signal to source drive module.
The above is only the specific structures for illustrating switch control module in power supply circuit, in the specific implementation, switch control
The specific structure of molding block is not limited to above structure provided in an embodiment of the present invention, can also be skilled person will appreciate that
Other structures, it is not limited here.
Preferably, in the power supply circuit of above-mentioned source drive module provided in an embodiment of the present invention, referring to fig. 4, switch control
Molding block 23 is also used to export digital voltage signal VDD to source drive when receiving second signal V2 and fourth signal V4
Module, when receiving the first signal V1 or third signal V3, stopping exports digital voltage signal VDD to source drive module.
Preferably, in the power supply circuit of above-mentioned source drive module provided in an embodiment of the present invention, referring to fig. 4, switch control
The output end of the 4th input terminal connection digital voltage signal VDD of molding block 23, the second output terminal of switch control module 23 connect
Connect the input terminal of source drive module.
Preferably, in the power supply circuit of above-mentioned source drive module provided in an embodiment of the present invention, referring to Fig. 5, switch control
Molding block 23 further includes：
Second switch device T2, fourth input terminal of the input terminal as switch control module, control terminal connection and door
The output end of AND, second output terminal of the output end of second switch device as switch control module.
Specifically, when second switch device is in the conductive state, then digital voltage signal is exported to source drive module；
When second switch device is in off state, then stop exporting digital voltage signal to source drive module.
In the power supply circuit of above-mentioned source drive module provided in an embodiment of the present invention, the second switch device is film
Transistor.Second switch device T2 can be thin film transistor (TFT) or other switching devices with switching function.Wherein,
Two switching element Ts 2 can be N-type transistor, and when exporting high level with door, then second switch break-over of device, low when exporting with door
Level, then second switch device ends；Or second switch device T2 is P-type transistor, and when exporting high level with door, then second
Switching device cut-off, when exporting high level, then second switch break-over of device with door.It is not limited thereto.
The above is only the specific structures for illustrating switch control module in power supply circuit, in the specific implementation, switch control
The specific structure of molding block is not limited to above structure provided in an embodiment of the present invention, can also be skilled person will appreciate that
Other structures, it is not limited here.
It should be noted that the first switch device and second switch device mentioned in the above embodiment of the present invention can be
Thin film transistor (TFT) (TFT, Thin Film Transistor), be also possible to metal oxide semiconductor field effect tube (MOS,
Metal Oxide Scmiconductor), it is not limited here.In specific implementation, the input terminal of these switching devices and defeated
Outlet can be interchanged according to transistor types and the difference of input signal, function, not do specific differentiation herein.
Generally, when first switch device and second switch device are P-type transistor, input terminal is source electrode, output end
For drain electrode；When first switch device and second switch device are N-type transistor, input terminal is drain electrode, and output end is source electrode.
Preferably, in order to simplify manufacture craft, in above-mentioned power supply circuit provided in an embodiment of the present invention, first switch device
Part and second switch device are all P-type transistor or are all N-type transistor, are not limited thereto.
Separately below to source drive module provided in an embodiment of the present invention by taking Fig. 5 and power supply circuit shown in fig. 6 as an example
The course of work of power supply circuit be described.
Embodiment one：
Its course of work is described by taking the structure of power supply circuit shown in fig. 5 as an example, wherein power supply shown in Fig. 5
In circuit, first switch device T1 and second switch device T2 are N-type transistor, and each N-type transistor is under high level effect
Conducting ends under low level effect.
When AVDD is less than AVDD_max, then first comparator COM1 exports high level and is supplied to the first input with door
End, when VDD is greater than VDD_min, then the second comparator COM2 exports high level and is supplied to the second input terminal with door, meanwhile,
High level is exported with door, then first switch device T1 and second switch device T2 conducting, digital voltage signal VDD and analog voltage
Signal AVDD inputs to source drive module, therefore when switch control module output digital voltage signal VDD and analog voltage
Signal AVDD is worked normally to source drive module, source drive module.
When AVDD is less than AVDD_max, then first comparator COM1 exports high level and is supplied to the first input with door
End, when VDD is less than or equal to VDD_min, then the second comparator COM2 exports low level and is supplied to the second input terminal with door,
Low level then is exported with door, then first switch device T1 and second switch device T2 cut-off, digital voltage signal VDD and simulation electricity
Pressure signal AVDD stops inputing to source drive module, therefore when switch control module stops output digital voltage signal VDD
With analog voltage signal AVDD to source drive module, source drive module cisco unity malfunction.
When AVDD be greater than or equal to AVDD_max, then first comparator COM1 export low level and be supplied to door first
Input terminal, when VDD is greater than VDD_min, then the second comparator COM2 exports high level and is supplied to the second input terminal with door, together
When, low level is exported with door, then first switch device T1 and second switch device T2 are turned off, digital voltage signal VDD and mould
Quasi- voltage signal AVDD stops inputing to source drive module, therefore when switch control module stops output digital voltage signal
VDD and analog voltage signal AVDD is to source drive module, source drive module cisco unity malfunction.
When AVDD be greater than or equal to AVDD_max, then first comparator COM1 export low level and be supplied to door first
Input terminal, when VDD is less than or equal to VDD_min, then the second comparator COM2 export low level and be supplied to it is the second of door defeated
Enter end, then with door export low level, then first switch device T1 and second switch device T2 cut-off, digital voltage signal VDD and
Analog voltage signal AVDD stops inputing to source drive module, therefore when switch control module stops output digital voltage letter
Number VDD and analog voltage signal AVDD is to source drive module, source drive module cisco unity malfunction.
In conclusion when display product is VDD power supply, then once there is the case where VDD is less than or equal to VDD_min, then
The power supply circuit provided through the embodiment of the present invention stops AVDD voltage and vdd voltage being supplied to source drive module；When
Display product is external power supply, then once there is AVDD more than or equal to AVDD_max, then provides through the embodiment of the present invention
Power supply circuit stops AVDD voltage and vdd voltage being supplied to source drive module.So as to avoid due to supply voltage mistake
Circuit burnout phenomenon caused by big or too small.
Embodiment two：
Its course of work is described by taking the structure of power supply circuit shown in fig. 6 as an example, wherein power supply shown in Fig. 6
In circuit, NAND gate will be set as with door, first switch device T1 and second switch device T2 are P-type transistor, and each p-type is brilliant
Body pipe is connected under low level effect, ends under high level effect.
When AVDD is less than AVDD_max, then first comparator COM1 exports high level and is supplied to the first input of NAND gate
End, when VDD is greater than VDD_min, then the second comparator COM2 exports high level and is supplied to the second input terminal of NAND gate, together
When, NAND gate exports low level, then first switch device T1 and second switch device T2 conducting, digital voltage signal VDD and mould
Quasi- voltage signal AVDD inputs to source drive module, therefore when switch control module output digital voltage signal VDD and mould
Quasi- voltage signal AVDD is worked normally to source drive module, source drive module.
When AVDD is less than AVDD_max, then first comparator COM1 exports high level and is supplied to the first input of NAND gate
End, when VDD is less than or equal to VDD_min, then the second comparator COM2 exports low level and is supplied to the second input of NAND gate
End, then NAND gate export high level, then first switch device T1 and second switch device T2 cut-off, digital voltage signal VDD and
Analog voltage signal AVDD stops inputing to source drive module, therefore when switch control module stops output digital voltage letter
Number VDD and analog voltage signal AVDD is to source drive module, source drive module cisco unity malfunction.
When AVDD is greater than or equal to AVDD_max, then first comparator COM1 exports low level and is supplied to the of NAND gate
One input terminal, when VDD is greater than VDD_min, then the second comparator COM2 exports high level and is supplied to the second input of NAND gate
End, meanwhile, NAND gate exports high level, then first switch device T1 and second switch device T2 are turned off, digital voltage signal
VDD and analog voltage signal AVDD stops inputing to source drive module, therefore when switch control module stops output number
Voltage signal VDD and analog voltage signal AVDD is to source drive module, source drive module cisco unity malfunction.
When AVDD is greater than or equal to AVDD_max, then first comparator COM1 exports low level and is supplied to the of NAND gate
One input terminal, when VDD is less than or equal to VDD_min, then the second comparator COM2 exports low level and is supplied to the of NAND gate
Two input terminals, then NAND gate exports high level, then first switch device T1 and second switch device T2 cut-off, digital voltage signal
VDD and analog voltage signal AVDD stops inputing to source drive module, therefore when switch control module stops output number
Voltage signal VDD and analog voltage signal AVDD is to source drive module, source drive module cisco unity malfunction.
In conclusion when display product is VDD power supply, then once there is the case where VDD is less than or equal to VDD_min, then
The power supply circuit provided through the embodiment of the present invention stops AVDD voltage and vdd voltage being supplied to source drive module；When
Display product is external power supply, then once there is AVDD more than or equal to AVDD_max, then provides through the embodiment of the present invention
Power supply circuit stops AVDD voltage and vdd voltage being supplied to source drive module.So as to avoid due to supply voltage mistake
Circuit burnout phenomenon caused by big or too small.
It should be noted that the power supply circuit construction in the embodiment of the present invention is only preferred embodiment, but it is not limited to this
The structure for the power supply circuit that inventive embodiments provide.
Based on the same inventive concept, the embodiment of the invention also provides a kind of display panels, including the embodiment of the present invention to mention
The power supply circuit of any of the above-described kind of source drive module supplied.The principle and an aforementioned provenance solved the problems, such as due to the display panel
The power supply circuit of pole drive module is similar, therefore the implementation of the power supply circuit of the source drive module in the display panel can be joined
See the implementation of the power supply circuit of source drive module in previous examples, overlaps will not be repeated.
Based on the same inventive concept, the embodiment of the invention also provides a kind of display devices, including the embodiment of the present invention to mention
The above-mentioned display panel supplied.The display device can be display, mobile phone, TV, notebook, all-in-one machine etc., and display is filled
The other essential component parts set are not do herein superfluous it will be apparent to an ordinarily skilled person in the art that have
It states, also should not be taken as limiting the invention.
Power supply circuit, display panel and the display device of a kind of source drive module provided in an embodiment of the present invention, it is described
Power supply circuit includes：First voltage comparison module, second voltage comparison module, switch control module and source drive module；Its
In, the first voltage comparison module is used to be compared analog voltage signal with the size of the reference voltage of analog voltage,
When determining that the analog voltage signal is greater than or equal to the reference voltage of the analog voltage, exports the first signal and opened to described
Control module is closed, otherwise, exports second signal to the switch control module；The second voltage comparison module is used for number
Voltage signal is compared with the size of the reference voltage of digital voltage, when determine the digital voltage signal be less than or equal to institute
When stating the reference voltage of digital voltage, third signal is exported to the switch control module, otherwise, exports fourth signal to described
Switch control module；The switch control module is used for when receiving the second signal and fourth signal, exports the mould
Intend voltage signal to source drive module, when receiving first signal or third signal, stops exporting the simulation electricity
Press signal to source drive module.Therefore, in the power supply circuit of the source drive module provided in the embodiment of the present invention, pass through
Detection of one voltage comparison module to analog voltage signal, and the inspection by second voltage comparison module to digital voltage signal
It surveys, when determining that analog voltage signal is greater than or equal to the reference voltage of analog voltage, or determines that digital voltage signal is less than
Or equal to digital voltage reference voltage when, stopping export analog voltage signal to source drive module, avoid due to simulate
Circuit is generated between voltage signal and digital voltage signal, that causes source drive module burns phenomenon.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (12)
1. a kind of power supply circuit of source drive module, which is characterized in that the power supply circuit include first voltage comparison module,
Second voltage comparison module and switch control module；
Wherein, the first voltage comparison module is used to carry out the size of the reference voltage of analog voltage signal and analog voltage
Compare, when determine the analog voltage signal be greater than or equal to the analog voltage reference voltage when, export the first signal to
Otherwise the switch control module exports second signal to the switch control module；
The second voltage comparison module is used to be compared digital voltage signal with the size of the reference voltage of digital voltage,
When determining that the digital voltage signal is less than or equal to the reference voltage of the digital voltage, exports third signal and opened to described
Control module is closed, otherwise, exports fourth signal to the switch control module；
The switch control module is used for when receiving the second signal and fourth signal, exports the analog voltage signal
To source drive module, when receiving first signal or third signal, stopping exports the analog voltage signal to source
Pole drive module.
2. power supply circuit according to claim 1, which is characterized in that the first input end of the first voltage comparison module
The output end of the analog voltage signal is connected, the second input terminal connects the output end of the reference voltage of the analog voltage,
The output end of the first voltage comparison module connects the first input end of the switch control module；
The first input end of the second voltage comparison module connects the output end of the digital voltage signal, the second input terminal
The output end of the reference voltage of the digital voltage is connected, the output end of the second voltage comparison module connects the switch control
Second input terminal of molding block；
The first input end of the switch control module connects the output end of the first voltage comparison module, the second input terminal
The output end of the second voltage comparison module is connected, third input terminal connects the output end of the analog voltage signal, institute
The first output end for stating switch control module connects the input terminal of the source drive module.
3. power supply circuit according to claim 2, which is characterized in that the first voltage comparison module includes：
First comparator, the reverse input end of the first comparator connect first resistor, the second electricity of positive input connection
Resistance, output end of the output end as the first voltage comparison module；
First resistor, first input end of the first end of the first resistor as the first voltage comparison module, the other end
Connect the reverse input end of the first comparator；
Second resistance, second input terminal of the first end of the second resistance as the first voltage comparison module, the other end
Connect the positive input of the first comparator；
3rd resistor, the 3rd resistor are connected between the positive input and ground of the first comparator；
4th resistance, the 4th resistance are connected between the reverse input end and output end of the first comparator.
4. power supply circuit according to claim 2, which is characterized in that the second voltage comparison module includes：
Second comparator, the positive input of second comparator connect the 5th resistance, the 6th electricity of reverse input end connection
Resistance, output end of the output end as the second voltage comparison module；
5th resistance, first input end of the first end of the 5th resistance as the second voltage comparison module, the other end
Connect the positive input of second comparator；
6th resistance, second input terminal of the first end of the 6th resistance as the second voltage comparison module, the other end
Connect the reverse input end of second comparator；
7th resistance, the 7th resistance are connected between the positive input and ground of second comparator；
8th resistance, the 8th resistance are connected between the reverse input end and output end of second comparator.
5. power supply circuit according to claim 2, which is characterized in that the switch control module includes：
With door, the first input end with the first input end of door as the switch control module, the second input terminal is made
For the second input terminal of the switch control module, output end connects the control terminal of first switch device；
First switch device, third input terminal of the input terminal as the switch control module, control terminal connection it is described with
The output end of door, first output end of the output end of the first switch device as the switch control module.
6. power supply circuit according to claim 5, which is characterized in that the first switch device is thin film transistor (TFT).
7. power supply circuit according to claim 5, which is characterized in that the switch control module is also used to receive
When the second signal and fourth signal, the digital voltage signal is exported to source drive module, when receiving described first
When signal or third signal, stopping exports the digital voltage signal to the source drive module.
8. power supply circuit according to claim 7, which is characterized in that the 4th input terminal of the switch control module connects
The output end of the digital voltage signal, the second output terminal of the switch control module connect the defeated of the source drive module
Enter end.
9. power supply circuit according to claim 8, which is characterized in that the switch control module further includes：
Second switch device, fourth input terminal of the input terminal as the switch control module, control terminal connection it is described with
The output end of door, second output terminal of the output end of the second switch device as the switch control module.
10. power supply circuit according to claim 9, which is characterized in that the second switch device is thin film transistor (TFT).
11. a kind of display panel, which is characterized in that the confession including source drive module described in any claim of claim 1-10
Circuit.
12. a kind of display device, which is characterized in that including the display panel described in claim 11.
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| CN107038988B (en) * | 2017-06-19 | 2019-11-05 | 京东方科技集团股份有限公司 | Control circuit, display screen, the driving method of display screen and display device |
| CN107527594B (en) * | 2017-09-22 | 2020-02-21 | 昆山龙腾光电股份有限公司 | Pulse signal adjusting circuit and backlight driving circuit of liquid crystal display screen |
| CN109490933B (en) * | 2018-10-22 | 2020-05-01 | 京东方科技集团股份有限公司 | Flat panel detector, detection method thereof and X-ray detection device |
| CN109410878A (en) * | 2018-12-18 | 2019-03-01 | 惠科股份有限公司 | A kind of driving circuit, driving device and display device |
| CN110427091B (en) * | 2019-07-19 | 2023-10-20 | 昆山龙腾光电股份有限公司 | Power supply circuit and display device |
| CN110995243A (en) * | 2019-11-19 | 2020-04-10 | Tcl华星光电技术有限公司 | Level conversion circuit and display panel |
| US11405038B2 (en) | 2019-11-19 | 2022-08-02 | Tcl China Star Optoelectronics Technology Co., Ltd. | Level shifter circuit and display panel |
| CN114299872B (en) * | 2022-01-04 | 2023-07-18 | 京东方科技集团股份有限公司 | Driving circuit, driving method thereof and display device |
| CN114283734B (en) * | 2022-01-28 | 2024-02-27 | 绵阳惠科光电科技有限公司 | Data driving protection circuit, device, display panel and display |
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