CN105845068A - Source electrode driving module power supply circuit, display panel and display device - Google Patents
Source electrode driving module power supply circuit, display panel and display device Download PDFInfo
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- CN105845068A CN105845068A CN201610425366.2A CN201610425366A CN105845068A CN 105845068 A CN105845068 A CN 105845068A CN 201610425366 A CN201610425366 A CN 201610425366A CN 105845068 A CN105845068 A CN 105845068A
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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
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Abstract
The invention discloses a source electrode driving module power supply circuit, a display panel and a display device, and aims at avoiding the adverse phenomena of burnout of a source electrode driving module due to oversized or undersized power supply voltage of the power supply circuit. The power supply circuit comprises a first voltage comparison module, a second voltage comparison module and a switch control module. The first voltage comparison module is used for comparing the size of an analog voltage signal and reference voltage of analog voltage. When the analog voltage signal is determined to be greater than or equal to the reference voltage of the analog voltage, a first signal is outputted to the switch control module. The second voltage comparison module is used for comparing the size of a digital voltage signal and reference voltage of digital voltage. When the digital voltage signal is determined to be less than or equal to the reference voltage of the digital voltage, a third signal is outputted to the switch control module. The switch control module is used for stopping outputting of the analog voltage signal when the switch control module receives the first signal or the third signal.
Description
Technical field
The present invention relates to Display Technique field, particularly relate to the power supply circuits of a kind of source drive module, display
Panel and display device.
Background technology
The source drive module (Source Driver IC) used in the product of display device at present exists one
Design defect, i.e. gives digital operation voltage VDD and simulation work in the duplex feeding voltage of source drive module
Make voltage AVDD, when meeting VDD<VDD_min, or during AVDD>AVDD_max, AVDD
A bigger electric current can be produced, cause the circuit of source drive module to be burned out, wherein, VDD_min
For the minima of digital operation voltage, AVDD_max is the maximum of simulation running voltage.
Specifically, the situation causing the circuit of source drive module to be burned out includes: 1, when display device closes
During machine, see Fig. 1, VDD power down so that VDD < VDD_min, now switch K1 Guan Bi, source electrode
Each passage can bleed off residual charge over the ground so that the power supply circuits of AVDD form loop with VDD conducting,
And produce big electric current, cause the circuit of source drive module to be burned out；Or, when the voltage of AVDD be by
VDD boosts and produces, and when display device shuts down, the magnitude of voltage of AVDD is slow with the decline of VDD
And be gradually reduced, and when shutdown moment XON opens, VDD occurs instantaneous drop-down, may result in AVDD
Big electric current occurs, or when display screen occurs that power supply shakiness causes VDD drop-down at work, AVDD is also
The risk of big electric current can be there is.2, change not by VDD when the AVDD of display device powers, and
When being to be powered by external circuit, if there is livewire work Plug Action, or adapter dislocation, can be by higher
The voltage such as signal loading such as VGH in the power supply of this AVDD, cause AVDD high voltage, equally can
The circuit causing source drive module is burned out.
Therefore, along with the increase of number of times of the switching on and shutting down of display device, or livewire work Plug Action etc.,
The voltage making AVDD increases the excessive electric current of generation and causes the circuit of source drive module to be burned out, to product
The reliability of product has serious impact.
Summary of the invention
The present invention provides the power supply circuits of a kind of source drive module, display floater and display device, in order to keep away
Exempt from power supply circuits due to supply voltage is excessive or the too small and source drive module that causes burn etc. no
Good phenomenon.
The power supply circuits of a kind of source drive module that the embodiment of the present invention provides include: the first voltage ratio relatively mould
Block, the second voltage comparison module and switch control module；
Wherein, described first voltage comparison module is for the reference voltage to analog voltage signal Yu analog voltage
Size compare, when determining that described analog voltage signal is electric more than or equal to reference of described analog voltage
During pressure, export the first signal give described switch control module, otherwise, output secondary signal give described switch control
Molding block；
Big for digital voltage signal and the reference voltage of digital voltage of described second voltage comparison module
Little compare, when determining the described digital voltage signal reference voltage less than or equal to described digital voltage
Time, output the 3rd signal is given described switch control module, otherwise, is exported the 4th signal to described on-off control
Module；
Described switch control module, for when receiving described secondary signal and four signals, exports described mould
Plan voltage signal is to source drive module, when receiving described first signal or three signals, stops output
Described analog voltage signal is to source drive module.
In a kind of possible embodiment, the power supply of the above-mentioned source drive module that the embodiment of the present invention provides
In circuit, the first input end of described first voltage comparison module connects the output of described analog voltage signal
End, its second input connects the outfan of the reference voltage of described analog voltage, and described first voltage ratio is relatively
The outfan of module connects the first input end of described switch control module；
The first input end of described second voltage comparison module connects the outfan of described digital voltage signal, its
Second input connects the outfan of the reference voltage of described digital voltage, described second voltage comparison module
Outfan connects the second input of described switch control module；
The first input end of described switch control module connects the outfan of described first voltage comparison module, its
Second input connects the outfan of described second voltage comparison module, and its 3rd input connects described simulation
The outfan of voltage signal, the first outfan of described switch control module connects described source drive module
Input.
In a kind of possible embodiment, the power supply of the above-mentioned source drive module that the embodiment of the present invention provides
In circuit, described first voltage comparison module includes:
First comparator, the reverse input end of described first comparator connects the first resistance, its positive input
Connecting the second resistance, its outfan is as the outfan of described first voltage comparison module；
First resistance, the first end of described first resistance is as the first input of described first voltage comparison module
End, the other end connects the reverse input end of described first comparator；
Second resistance, the first end of described second resistance is as the second input of described first voltage comparison module
End, the other end connects the positive input of described first comparator；
3rd resistance, described 3rd resistance is connected between positive input and the ground of described first comparator；
4th resistance, described 4th resistance be connected to the reverse input end of described first comparator and outfan it
Between.
In a kind of possible embodiment, the power supply of the above-mentioned source drive module that the embodiment of the present invention provides
In circuit, described second voltage comparison module includes:
Second comparator, the positive input of described second comparator connects the 5th resistance, its reverse input end
Connecting the 6th resistance, its outfan is as the outfan of described second voltage comparison module；
5th resistance, the first end of described 5th resistance is as the first input of described second voltage comparison module
End, the other end connects the positive input of described second comparator；
6th resistance, the first end of described 6th resistance is as the second input of described second voltage comparison module
End, the other end connects the reverse input end of described second comparator；
7th resistance, described 7th resistance is connected between positive input and the ground of described second comparator；
8th resistance, described 8th resistance be connected to the reverse input end of described second comparator and outfan it
Between.
In a kind of possible embodiment, the power supply of the above-mentioned source drive module that the embodiment of the present invention provides
In circuit, described switch control module includes:
With door, the described first input end with door is as the first input end of described switch control module, and it is the years old
Two inputs connect the first switching device as the second input of described switch control module, its outfan
Control end；
First switching device, its input is as the 3rd input of described switch control module, and it controls end
Connecting the described outfan with door, the outfan of described first switching device is as described switch control module
First outfan.
In a kind of possible embodiment, the power supply of the above-mentioned source drive module that the embodiment of the present invention provides
In circuit, described first switching device is thin film transistor (TFT).
In a kind of possible embodiment, the power supply of the above-mentioned source drive module that the embodiment of the present invention provides
In circuit, described switch control module, it is additionally operable to when receiving described secondary signal and four signals, defeated
Go out described digital voltage signal to source drive module, when receiving described first signal or three signals,
Stop exporting described digital voltage signal to described source drive module.
In a kind of possible embodiment, the power supply of the above-mentioned source drive module that the embodiment of the present invention provides
In circuit, the four-input terminal of described switch control module connects the outfan of described digital voltage signal, institute
The second outfan stating switch control module connects the input of described source drive module.
In a kind of possible embodiment, the power supply of the above-mentioned source drive module that the embodiment of the present invention provides
In circuit, described switch control module also includes:
Second switch device, its input is as the four-input terminal of described switch control module, and it controls end
Connecting the described outfan with door, the outfan of described second switch device is as described switch control module
Second outfan.
In a kind of possible embodiment, the power supply of the above-mentioned source drive module that the embodiment of the present invention provides
In circuit, described second switch device is thin film transistor (TFT).
Correspondingly, the embodiment of the present invention additionally provides a kind of display floater, provides including the embodiment of the present invention
The power supply circuits of the source drive module of any one.
Correspondingly, the embodiment of the present invention additionally provides a kind of display device, provides including the embodiment of the present invention
Above-mentioned display floater.
The present invention has the beneficial effect that:
The power supply circuits of a kind of source drive module, display floater and the display dress that the embodiment of the present invention provides
Putting, described power supply circuits include: the first voltage comparison module, the second voltage comparison module and on-off control mould
Block；Wherein, described first voltage comparison module is for the reference voltage to analog voltage signal Yu analog voltage
Size compare, when determining that described analog voltage signal is electric more than or equal to reference of described analog voltage
During pressure, export the first signal give described switch control module, otherwise, output secondary signal give described switch control
Molding block；Described second voltage comparison module is for the reference voltage to digital voltage signal and digital voltage
Size compares, when determining the described digital voltage signal reference voltage less than or equal to described digital voltage
Time, output the 3rd signal is given described switch control module, otherwise, is exported the 4th signal to described on-off control
Module；Described switch control module is for when receiving described secondary signal and four signals, and output is described
Analog voltage signal, to source drive module, when receiving described first signal or three signals, stops defeated
Go out described analog voltage signal to source drive module.Therefore, the source drive provided in the embodiment of the present invention
In the power supply circuits of module, by the detection to analog voltage signal of first voltage comparison module, and pass through
The detection to digital voltage signal of second voltage comparison module, when determining that analog voltage signal is more than or equal to mould
When intending the reference voltage of voltage, or determine that digital voltage signal is less than or equal to the reference voltage of digital voltage
Time, stop output analog voltage signal to source drive module, it is to avoid due to analog voltage signal and numeral
Producing loop between voltage signal, that causes source drive module burns phenomenon.
Accompanying drawing explanation
The structure chart of the power supply circuits of a kind of source drive module that Fig. 1 provides for prior art；
The structural representation of the power supply circuits of a kind of source drive module that Fig. 2 provides for the embodiment of the present invention；
The concrete structure signal of the power supply circuits of a kind of source drive module that Fig. 3 provides for the embodiment of the present invention
Figure；
The structural representation of the power supply circuits of the second source drive module that Fig. 4 provides for the embodiment of the present invention
Figure；
The concrete structure of the power supply circuits of the second source drive module that Fig. 5 provides for the embodiment of the present invention shows
It is intended to；
The concrete structure of the power supply circuits of the third source drive module that Fig. 6 provides for the embodiment of the present invention shows
It is intended to.
Detailed description of the invention
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to this
Bright it is described in further detail, it is clear that described embodiment is only a part of embodiment of the present invention,
Rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out all other embodiments obtained under creative work premise, broadly fall into the scope of protection of the invention.
Embodiments provide the power supply circuits of a kind of source drive module, display floater and display dress
Put, in order to avoid in power supply circuits owing to supply voltage is excessive or the too small and source drive module that causes
The bad phenomenon such as burn.
Below in conjunction with the accompanying drawings, the power supply circuits of source drive module, the display surface to embodiment of the present invention offer
The detailed description of the invention of plate and display device is described in detail.
Seeing Fig. 2, the power supply circuits of a kind of source drive module that the embodiment of the present invention provides include: first
Voltage comparison module the 21, second voltage comparison module 22, switch control module 23 and source drive module 24；
Wherein, the first voltage comparison module 21 is for the ginseng to analog voltage signal AVDD Yu analog voltage
The size examining voltage AVDD_max compares, when determining that analog voltage signal AVDD is more than or equal to
During the reference voltage AVDD_max of analog voltage, export the first signal V1 to switch control module 23,
Otherwise, output secondary signal V2 is to switch control module 23；
Second voltage comparison module 22 is for the reference voltage to digital voltage signal VDD Yu digital voltage
The size of VDD_min compares, when determining that digital voltage signal VDD is less than or equal to digital voltage
During reference voltage VDD_min, the 3rd signal V3 is to switch control module 23 in output, otherwise, and output the
Four signal V4 are to switch control module 23；
Switch control module 23 is for when receiving secondary signal V2 and the 4th signal V4, and output is simulated
Voltage signal AVDD is to source drive module 24, when receiving the first signal V1 or the 3rd signal V3,
Stop output analog voltage signal AVDD to source drive module 24.
It should be noted that analog voltage signal is for for inputting to source drive module in the embodiment of the present invention
Simulation running voltage signal AVDD, the reference voltage of analog voltage refers to for defeated to source drive module
Maximum simulation running voltage AVDD_max entered, wherein the value of AVDD_max is can be with different model
Display product in the operation principle of source drive module obtain, occurrence does not limits at this.Numeral electricity
Pressure signal is the value of the digital operation voltage VDD for inputting to source drive module, the ginseng of digital voltage
Examine voltage and refer to the minimum digital operation voltage VDD_min for inputting to source drive module, wherein
The value of VDD_min is can to obtain with the operation principle of the source drive module in the display product of different model
Arriving, occurrence does not limits at this.
The power supply circuits of a kind of source drive module that the embodiment of the present invention provides include: the first voltage ratio relatively mould
Block, the second voltage comparison module, switch control module and source drive module；Wherein, described first voltage
Comparison module is for comparing, when determining the size of analog voltage signal with the reference voltage of analog voltage
When described analog voltage signal is more than or equal to the reference voltage of described analog voltage, export the first signal to institute
Stating switch control module, otherwise, output secondary signal gives described switch control module；Described second voltage ratio
Relatively module is for comparing, when determining the size of digital voltage signal with the reference voltage of digital voltage
When stating the reference voltage that digital voltage signal is less than or equal to described digital voltage, output the 3rd signal is given described
Switch control module, otherwise, output the 4th signal gives described switch control module；Described switch control module
For when receiving described first signal or three signals, stop exporting described analog voltage signal to source electrode
Drive module.Therefore, in the power supply circuits of the source drive module provided in the embodiment of the present invention, by the
The detection to analog voltage signal of one voltage comparison module, and by the second voltage comparison module to numeral electricity
The detection of pressure signal, when determining the reference voltage that analog voltage signal is more than or equal to analog voltage, or
When determining the reference voltage that digital voltage signal is less than or equal to digital voltage, stop output analog voltage signal
To source drive module, it is to avoid owing to producing loop between analog voltage signal and digital voltage signal, make
Become source drive module burns phenomenon.
In order to further describe the power supply circuits of the source drive module that the embodiment of the present invention provides, see Fig. 2,
In the power supply circuits of the above-mentioned source drive module that the embodiment of the present invention provides, the first voltage comparison module 21
First input end connect analog voltage signal AVDD outfan, its second input connect analog voltage
The outfan of reference voltage AVDD_max, the outfan connecting valve control of the first voltage comparison module 21
The first input end of molding block 23；The first input end of the second voltage comparison module 22 connects digital voltage letter
The outfan of number VDD, its second input connects the output of the reference voltage VDD_min of digital voltage
End, the second input of the outfan connecting valve control module 23 of the second voltage comparison module 22；Switch
The first input end of control module 23 connects the outfan of the first voltage comparison module 21, its second input
Connecting the outfan of the second voltage comparison module 22, its 3rd input connects analog voltage signal AVDD
Outfan, switch control module 23 first outfan connect source drive module 24 input.
Below in conjunction with specific embodiment, the present invention is described in detail.It should be noted that the present embodiment
In be to preferably explain the present invention, but be not intended to the present invention.
It is preferred that in the power supply circuits of the above-mentioned source drive module of embodiment of the present invention offer, see Fig. 3,
First voltage comparison module 21 includes:
First comparator COM1, the reverse input end of the first comparator (-) connect the first resistance R1, its
Positive input (+) connecting the second resistance R2, its outfan is as the outfan of the first voltage comparison module；
First resistance R1, the first end of the first resistance as the first input end of the first voltage comparison module,
The other end connect the first comparator COM1 reverse input end (-)；
Second resistance R2, the first end of the second resistance as the second input of the first voltage comparison module,
The other end connect the first comparator COM1 positive input (+)；
3rd resistance R3, the 3rd resistance be connected to the first comparator COM1 positive input (+) with ground
Between GND；
4th resistance R4, the 4th resistance be connected to the first comparator COM1 reverse input end (-) and output
Between end.
Further, when specific embodiment, as it is shown on figure 3, according to the operation principle of the first comparator,
If the voltage of the positive input input of the first comparator inputs more than the reverse input end of the first comparator
Magnitude of voltage, then outfan output high level, if the voltage of the positive input input of the first comparator is less than the
The magnitude of voltage of the reverse input end input of one comparator, then outfan output low level.Wherein, the first letter
Number V1 is the first comparator output terminal output low level, and secondary signal V2 is the outfan of the first comparator
Output high level.
Specifically, in the power supply circuits of the above-mentioned source drive module that the embodiment of the present invention provides, first compares
The reference voltage AVDD_max of the positive input input analog voltage of device, the reverse input of the first comparator
End input analog voltage signal AVDD, if AVDD_max >=AVDD, then outfan UI ＞ 0, is the
Binary signal V2；If AVDD_max is ＜ AVDD, then outfan UI ＜ 0, is the first signal V1.
Wherein, the first input end of corresponding first voltage comparison module of the positive input of the first comparator, also
Can the second input of corresponding first voltage comparison module, the positive input input mould of the i.e. first comparator
Intend the reference voltage AVDD_max of voltage, the reverse input end input analog voltage signal of the first comparator
AVDD；Or, the reference voltage AVDD_max of the reverse input end input analog voltage of the first comparator,
The positive input input analog voltage signal AVDD of the first comparator.It is not specifically limited at this.
More than it is merely illustrative of the concrete structure of the first voltage comparison module in power supply circuits, is being embodied as
Time, the concrete structure of the first voltage comparison module is not limited to the said structure that the embodiment of the present invention provides, also may be used
To be other structures that skilled person will appreciate that, do not limit at this.
It is preferred that in the power supply circuits of the above-mentioned source drive module of embodiment of the present invention offer, see Fig. 3,
Second voltage comparison module 22 includes:
Second comparator COM2, the positive input of the second comparator (+) connect the 5th resistance R5, its
Reverse input end (-) connecting the 6th resistance R6, its outfan is as the outfan of the second voltage comparison module；
5th resistance R5, the first end of the 5th resistance as the first input end of the second voltage comparison module,
The other end connect the second comparator positive input (+)；
6th resistance R6, the first end of the 6th resistance as the second input of the second voltage comparison module,
The other end connect the second comparator reverse input end (-)；
7th resistance R7, the 7th resistance be connected to the second comparator COM2 positive input (+) with ground
Between GND；
8th resistance R8, the 8th resistance be connected to the second comparator COM2 reverse input end (-) and defeated
Go out between end.
Further, when specific embodiment, according to the operation principle of the second comparator, if the second comparator
Positive input input voltage more than the second comparator reverse input end input magnitude of voltage, then export
End output high level, if the voltage of the positive input input of the second comparator is less than the reverse of the second comparator
The magnitude of voltage of input input, then outfan output low level.Wherein, in the embodiment of the present invention, the 3rd
Signal V3 is the second comparator output terminal output low level, and the 4th signal V4 is the output of the second comparator
End output high level.
Specifically, in the power supply circuits of the above-mentioned source drive module that the embodiment of the present invention provides, such as Fig. 3 institute
Show, the positive input of the second comparator input digital voltage signal VDD, the second comparator the most defeated
Enter the reference voltage VDD_min of end input digital voltage, if VDD >=VDD_min, then outfan U2
＞ 0, is the 4th signal V4；If VDD is ＜ VDD_min, then outfan UI ＜ 0, is the 3rd signal V3.
Wherein, the first input end of corresponding second voltage comparison module of the positive input of the second comparator, also
Can the second input of corresponding second voltage comparison module, the positive input input number of the i.e. second comparator
Word voltage signal VDD, the reference voltage of the reverse input end input digital voltage of the second comparator
VDD_min；Or, the reverse input end input digital voltage signal VDD of the second comparator, the second ratio
The reference voltage VDD_min of the positive input input digital voltage of relatively device.It is not specifically limited at this.
More than it is merely illustrative of the concrete structure of the second voltage comparison module in power supply circuits, is being embodied as
Time, the concrete structure of the second voltage comparison module is not limited to the said structure that the embodiment of the present invention provides, also may be used
To be other structures that skilled person will appreciate that, do not limit at this.
It is preferred that in the power supply circuits of the above-mentioned source drive module of embodiment of the present invention offer, see Fig. 3,
Switch control module 23 includes:
With door AND, with the first input end of door AND as the first input end of switch control module 23,
Its second input connects the first switching device as the second input of switch control module, its outfan
The control end of T1；
First switching element T 1, its input is as the 3rd input of switch control module 23, and it controls
End connects the outfan with door AND, and the outfan of the first switching element T 1 is as switch control module 23
The first outfan.
Further, when specific embodiment, according to the operation principle with door, when with two inputs in door
End, as long as having the data of an input input less than 0, then the value with the outfan of door is less than 0.When with
The data that two inputs in Men all export are more than 0, then the value with the outfan of door is more than 0.
Specifically, as the first signal V1 that the outfan receiving the first comparator exports, and/or receive
During the 3rd signal V3 that the outfan of the second comparator exports, with the outfan output low level of door.When connecing
Receive secondary signal V2 of the outfan output of the first comparator, and the outfan receiving the second comparator is defeated
During the 4th signal V4 gone out, export high level with the outfan of door.
It is preferred that in the power supply circuits of the above-mentioned source drive module of embodiment of the present invention offer, the first switch
Device T1 can be thin film transistor (TFT), or other have the switching device of switching function.Wherein, first
Switching element T 1 can be N-type transistor, when exporting high level, then the first switch device conductive with door,
When with door output low level, then first switching device cut-off；Or the first switching element T 1 is P-type crystal
Pipe, when exporting high level, then the first switching device cut-off with door, when exporting high level with door, then first opens
Close break-over of device.In this no limit.
Specifically, when the first switching device is in the conduction state, then analog voltage signal is exported and drive to source electrode
Dynamic model block；When the first switching device is in cut-off state, stop output analog voltage signal to source drive mould
Block.
More than it is merely illustrative of the concrete structure of power supply circuits breaker in middle control module, in the specific implementation,
The concrete structure of switch control module is not limited to the said structure that the embodiment of the present invention provides, it is also possible to be ability
Field technique personnel other structures knowable, do not limit at this.
It is preferred that in the power supply circuits of the above-mentioned source drive module of embodiment of the present invention offer, see Fig. 4,
Switch control module 23, is additionally operable to when receiving secondary signal V2 and the 4th signal V4, output numeral
Voltage signal VDD, to source drive module, when receiving the first signal V1 or the 3rd signal V3, stops
Only output digital voltage signal VDD is to source drive module.
It is preferred that in the power supply circuits of the above-mentioned source drive module of embodiment of the present invention offer, see Fig. 4,
The four-input terminal of switch control module 23 connects the outfan of digital voltage signal VDD, on-off control mould
Second outfan of block 23 connects the input of source drive module.
It is preferred that in the power supply circuits of the above-mentioned source drive module of embodiment of the present invention offer, see Fig. 5,
Switch control module 23 also includes:
Second switch device T2, its input is as the four-input terminal of switch control module, and it controls end
Connecting and the outfan of door AND, the outfan of second switch device is second defeated as switch control module
Go out end.
Specifically, when second switch device is in the conduction state, then digital voltage signal is exported and drive to source electrode
Dynamic model block；When second switch device is in cut-off state, then stop output digital voltage signal to source drive
Module.
In the power supply circuits of the above-mentioned source drive module that the embodiment of the present invention provides, described second switch device
For thin film transistor (TFT).Second switch device T2 can be thin film transistor (TFT), or other have switching function
Switching device.Wherein, second switch device T2 can be N-type transistor, when exporting high level with door,
Then second switch break-over of device, when with door output low level, then second switch device cut-off；Or second opens
Close device T2 be P-type transistor, when with door export high level, then second switch device cut-off, when with door
Output high level, then second switch break-over of device.In this no limit.
More than it is merely illustrative of the concrete structure of power supply circuits breaker in middle control module, in the specific implementation,
The concrete structure of switch control module is not limited to the said structure that the embodiment of the present invention provides, it is also possible to be ability
Field technique personnel other structures knowable, do not limit at this.
It should be noted that the first switching device and second switch device mentioned in the above embodiment of the present invention
Can be thin film transistor (TFT) (TFT, Thin Film Transistor), it is also possible to be metal-oxide semiconductor (MOS)
Field effect transistor (MOS, Metal Oxide Scmiconductor), does not limits at this.In being embodied as,
The input of these switching devices and outfan are according to transistor types and the difference of input signal, its function
Can exchange, not do concrete differentiation at this.
Usually, when the first switching device and second switch device are P-type transistor, input is source electrode,
Outfan is drain electrode；When the first switching device and second switch device are N-type transistor, input is leakage
Pole, outfan is source electrode.
It is preferred that in order to simplify processing technology, in the above-mentioned power supply circuits that the embodiment of the present invention provides, the
One switching device and second switch device are all P-type transistor or are all N-type transistor, in this no limit.
The source electrode provided the embodiment of the present invention as a example by the power supply circuits shown in Fig. 5 and Fig. 6 separately below drives
The work process of the power supply circuits of dynamic model block is described.
Embodiment one:
As a example by the structure of the power supply circuits shown in Fig. 5, its work process is described, wherein in Fig. 5 institute
In the power supply circuits shown, the first switching element T 1 and second switch device T2 are N-type transistor, each N
Transistor npn npn turns under high level effect, ends under low level effect.
When AVDD is less than AVDD_max, then the first comparator COM1 output high level and be supplied to
The first input end of door, when VDD is more than VDD_min, then the second comparator COM2 exports high level
And it is supplied to the second input with door, meanwhile, export high level, then the first switching element T 1 He with door
Second switch device T2 turns on, and digital voltage signal VDD and analog voltage signal AVDD all inputs to
Source drive module, therefore when switch control module output digital voltage signal VDD and analog voltage signal
AVDD normally works to source drive module, source drive module.
When AVDD is less than AVDD_max, then the first comparator COM1 output high level and be supplied to
The first input end of door, when VDD is less than or equal to VDD_min, then the second comparator COM2 output
Low level is also supplied to the second input with door, then with door output low level, then and the first switching element T 1
Ending with second switch device T2, digital voltage signal VDD and analog voltage signal AVDD all stops
Input to source drive module, therefore stop output digital voltage signal VDD and mould when switch control module
Intend voltage signal AVDD to source drive module, source drive module cisco unity malfunction.
When AVDD is more than or equal to AVDD_max, then the first comparator COM1 output low level carrying
Supply and the first input end of door, when VDD is more than VDD_min, then the second comparator COM2 output
High level is also supplied to the second input with door, meanwhile, with door output low level, then the first switching device
T1 and second switch device T2 is turned off, and digital voltage signal VDD and analog voltage signal AVDD is equal
Stop inputing to source drive module, therefore stop output digital voltage signal VDD when switch control module
With analog voltage signal AVDD to source drive module, source drive module cisco unity malfunction.
When AVDD is more than or equal to AVDD_max, then the first comparator COM1 output low level carrying
Supply and the first input end of door, when VDD is less than or equal to VDD_min, then the second comparator COM2
Output low level is also supplied to the second input with door, then with door output low level, then the first switching device
T1 and second switch device T2 cut-off, digital voltage signal VDD and analog voltage signal AVDD all stops
Only input to source drive module, therefore when switch control module stop output digital voltage signal VDD and
Analog voltage signal AVDD is to source drive module, source drive module cisco unity malfunction.
In sum, when display product is that VDD powers, the most once occur that VDD is less than or equal to
The situation of VDD_min, then the power supply circuits provided by the embodiment of the present invention, stop AVDD voltage
And vdd voltage is supplied to source drive module；When display product is externally fed, the most once occur
AVDD is more than or equal to AVDD_max, the then power supply circuits provided by the embodiment of the present invention, and stopping will
AVDD voltage and vdd voltage are supplied to source drive module.Thus avoid due to supply voltage mistake
Circuit burnout phenomenon that is big or too small and that cause.
Embodiment two:
As a example by the structure of the power supply circuits shown in Fig. 6, its work process is described, wherein in Fig. 6 institute
In the power supply circuits shown, NAND gate will be set to door, the first switching element T 1 and second switch device T2
Being P-type transistor, each P-type transistor turns under low level effect, ends under high level effect.
When AVDD is less than AVDD_max, then the first comparator COM1 output high level and be supplied to
The first input end of not gate, when VDD is more than VDD_min, then the second high electricity of comparator COM2 output
Put down and be supplied to the second input of NAND gate, meanwhile, NAND gate output low level, then the first switching device
T1 and second switch device T2 conducting, digital voltage signal VDD and analog voltage signal AVDD is the most defeated
Enter to source drive module, therefore when switch control module output digital voltage signal VDD and analog voltage
Signal AVDD normally works to source drive module, source drive module.
When AVDD is less than AVDD_max, then the first comparator COM1 output high level and be supplied to
The first input end of not gate, when VDD is less than or equal to VDD_min, then the second comparator COM2 is defeated
Go out low level and be supplied to the second input of NAND gate, then NAND gate output high level, then the first derailing switch
Part T1 and second switch device T2 cut-off, digital voltage signal VDD and analog voltage signal AVDD is equal
Stop inputing to source drive module, therefore stop output digital voltage signal VDD when switch control module
With analog voltage signal AVDD to source drive module, source drive module cisco unity malfunction.
When AVDD is more than or equal to AVDD_max, then the first comparator COM1 output low level carrying
The first input end of supply NAND gate, when VDD is more than VDD_min, then the second comparator COM2 is defeated
Go out high level and be supplied to the second input of NAND gate, meanwhile, NAND gate output high level, then first open
Close device T1 and second switch device T2 to be turned off, digital voltage signal VDD and analog voltage signal
AVDD all stops inputing to source drive module, therefore stops output digital voltage letter when switch control module
Number VDD and analog voltage signal AVDD is to source drive module, source drive module cisco unity malfunction.
When AVDD is more than or equal to AVDD_max, then the first comparator COM1 output low level carrying
The first input end of supply NAND gate, when VDD is less than or equal to VDD_min, then the second comparator COM2
Output low level is also supplied to the second input of NAND gate, then NAND gate output high level, then the first switch
Device T1 and second switch device T2 cut-off, digital voltage signal VDD and analog voltage signal AVDD
All stop inputing to source drive module, therefore stop output digital voltage signal VDD when switch control module
With analog voltage signal AVDD to source drive module, source drive module cisco unity malfunction.
In sum, when display product is that VDD powers, the most once occur that VDD is less than or equal to
The situation of VDD_min, then the power supply circuits provided by the embodiment of the present invention, stop AVDD voltage
And vdd voltage is supplied to source drive module；When display product is externally fed, the most once occur
AVDD is more than or equal to AVDD_max, the then power supply circuits provided by the embodiment of the present invention, and stopping will
AVDD voltage and vdd voltage are supplied to source drive module.Thus avoid due to supply voltage mistake
Circuit burnout phenomenon that is big or too small and that cause.
It should be noted that the power supply circuit construction in the embodiment of the present invention is only preferred embodiment, but not
It is limited to the structure of the power supply circuits that the embodiment of the present invention provides.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of display floater, real including the present invention
Execute the power supply circuits of any of the above-described kind of source drive module that example provides.Owing to this display floater solves problem
Principle is similar to the power supply circuits of aforementioned a kind of source drive module, therefore the source drive in this display floater
The enforcement of the power supply circuits of module may refer to the enforcement of the power supply circuits of source drive module in previous examples,
Repeat no more in place of repetition.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of display device, real including the present invention
Execute the above-mentioned display floater that example provides.This display device can be display, mobile phone, TV, notebook,
All-in-ones etc., are the ordinary skill people of this area for other requisite ingredient of display device
Member should be appreciated that have, and does not repeats at this, also should not be taken as limiting the invention.
The power supply circuits of a kind of source drive module, display floater and the display dress that the embodiment of the present invention provides
Putting, described power supply circuits include: the first voltage comparison module, the second voltage comparison module, on-off control mould
Block and source drive module；Wherein, described first voltage comparison module is for analog voltage signal and simulation
The size of the reference voltage of voltage compares, when determining that described analog voltage signal is more than or equal to described mould
Intend voltage reference voltage time, export the first signal give described switch control module, otherwise, output second letter
Number give described switch control module；Described second voltage comparison module is for digital voltage signal and numeral electricity
The size of the reference voltage of pressure compares, when determining that described digital voltage signal is less than or equal to described numeral
During the reference voltage of voltage, output the 3rd signal gives described switch control module, otherwise, exports the 4th signal
To described switch control module；Described switch control module is for when receiving described secondary signal and the 4th letter
Number time, export described analog voltage signal to source drive module, when receiving described first signal or the 3rd
During signal, stop exporting described analog voltage signal to source drive module.Therefore, in the embodiment of the present invention
In the power supply circuits of the source drive module provided, by the first voltage comparison module to analog voltage signal
Detection, and by the detection to digital voltage signal of second voltage comparison module, when determining that analog voltage is believed
During number more than or equal to the reference voltage of analog voltage, or determine that digital voltage signal is less than or equal to numeral
During the reference voltage of voltage, stop output analog voltage signal to source drive module, it is to avoid due to simulation
Producing loop between voltage signal and digital voltage signal, that causes source drive module burns phenomenon.
Obviously, those skilled in the art can carry out various change and modification without deviating from this to the present invention
Bright spirit and scope.So, if the present invention these amendment and modification belong to the claims in the present invention and
Within the scope of its equivalent technologies, then the present invention is also intended to comprise these change and modification.
Claims (12)
1. the power supply circuits of a source drive module, it is characterised in that described power supply circuits include first
Voltage comparison module, the second voltage comparison module and switch control module；
Wherein, described first voltage comparison module is for the reference voltage to analog voltage signal Yu analog voltage
Size compare, when determining that described analog voltage signal is electric more than or equal to reference of described analog voltage
During pressure, export the first signal give described switch control module, otherwise, output secondary signal give described switch control
Molding block；
Big for digital voltage signal and the reference voltage of digital voltage of described second voltage comparison module
Little compare, when determining the described digital voltage signal reference voltage less than or equal to described digital voltage
Time, output the 3rd signal is given described switch control module, otherwise, is exported the 4th signal to described on-off control
Module；
Described switch control module, for when receiving described secondary signal and four signals, exports described mould
Plan voltage signal is to source drive module, when receiving described first signal or three signals, stops output
Described analog voltage signal is to source drive module.
Power supply circuits the most according to claim 1, it is characterised in that described first voltage ratio relatively mould
The first input end of block connects the outfan of described analog voltage signal, and its second input connects described simulation
The outfan of the reference voltage of voltage, the outfan of described first voltage comparison module connects described on-off control
The first input end of module；
The first input end of described second voltage comparison module connects the outfan of described digital voltage signal, its
Second input connects the outfan of the reference voltage of described digital voltage, described second voltage comparison module
Outfan connects the second input of described switch control module；
The first input end of described switch control module connects the outfan of described first voltage comparison module, its
Second input connects the outfan of described second voltage comparison module, and its 3rd input connects described simulation
The outfan of voltage signal, the first outfan of described switch control module connects described source drive module
Input.
Power supply circuits the most according to claim 2, it is characterised in that described first voltage ratio relatively mould
Block includes:
First comparator, the reverse input end of described first comparator connects the first resistance, its positive input
Connecting the second resistance, its outfan is as the outfan of described first voltage comparison module；
First resistance, the first end of described first resistance is as the first input of described first voltage comparison module
End, the other end connects the reverse input end of described first comparator；
Second resistance, the first end of described second resistance is as the second input of described first voltage comparison module
End, the other end connects the positive input of described first comparator；
3rd resistance, described 3rd resistance is connected between positive input and the ground of described first comparator；
4th resistance, described 4th resistance be connected to the reverse input end of described first comparator and outfan it
Between.
Power supply circuits the most according to claim 2, it is characterised in that described second voltage ratio relatively mould
Block includes:
Second comparator, the positive input of described second comparator connects the 5th resistance, its reverse input end
Connecting the 6th resistance, its outfan is as the outfan of described second voltage comparison module；
5th resistance, the first end of described 5th resistance is as the first input of described second voltage comparison module
End, the other end connects the positive input of described second comparator；
6th resistance, the first end of described 6th resistance is as the second input of described second voltage comparison module
End, the other end connects the reverse input end of described second comparator；
7th resistance, described 7th resistance is connected between positive input and the ground of described second comparator；
8th resistance, described 8th resistance be connected to the reverse input end of described second comparator and outfan it
Between.
Power supply circuits the most according to claim 2, it is characterised in that described switch control module bag
Include:
With door, the described first input end with door is as the first input end of described switch control module, and it is the years old
Two inputs connect the first switching device as the second input of described switch control module, its outfan
Control end；
First switching device, its input is as the 3rd input of described switch control module, and it controls end
Connecting the described outfan with door, the outfan of described first switching device is as described switch control module
First outfan.
Power supply circuits the most according to claim 5, it is characterised in that described first switching device is
Thin film transistor (TFT).
Power supply circuits the most according to claim 5, it is characterised in that described switch control module,
It is additionally operable to when receiving described secondary signal and four signals, exports described digital voltage signal and drive to source electrode
Dynamic model block, when receiving described first signal or three signals, stops exporting described digital voltage signal and gives
Described source drive module.
Power supply circuits the most according to claim 7, it is characterised in that described switch control module
Four-input terminal connects the outfan of described digital voltage signal, the second outfan of described switch control module
Connect the input of described source drive module.
Power supply circuits the most according to claim 8, it is characterised in that described switch control module is also
Including:
Second switch device, its input is as the four-input terminal of described switch control module, and it controls end
Connecting the described outfan with door, the outfan of described second switch device is as described switch control module
Second outfan.
Power supply circuits the most according to claim 9, it is characterised in that described second switch device is
Thin film transistor (TFT).
11. 1 kinds of display floaters, it is characterised in that include the source electrode described in the arbitrary claim of claim 1-10
Drive the power supply circuits of module.
12. 1 kinds of display devices, it is characterised in that include the display floater described in claim 11.
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