CN109801604A - power supply control circuit, power supply circuit and display device - Google Patents
power supply control circuit, power supply circuit and display device Download PDFInfo
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- CN109801604A CN109801604A CN201910216076.0A CN201910216076A CN109801604A CN 109801604 A CN109801604 A CN 109801604A CN 201910216076 A CN201910216076 A CN 201910216076A CN 109801604 A CN109801604 A CN 109801604A
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Abstract
The embodiment of the invention provides a power supply control circuit, a power supply circuit and a display device. The power supply control circuit comprises an acquisition unit and a judgment unit. The input end of the acquisition unit is electrically connected with the logic board and is used for acquiring the actual working voltage of the logic board after the logic board is electrified, and generating and outputting the trigger signal according to the actual working voltage of the logic board. The first input end of the judging unit is connected with the power supply, the second input end of the judging unit is electrically connected with the output end of the collecting unit, the third input end of the judging unit is grounded, the output end of the judging unit is electrically connected with the driving chip, the judging unit is used for receiving the trigger signal and the power supply voltage and judging whether the voltage of the trigger signal is greater than the threshold voltage, if so, the power supply voltage is supplied to the driving chip, and the situation that the picture is abnormal because the logic board does not start to work normally and the source electrode driving chip or/grid electrode driving chip starts to work is avoided.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of power-supplying circuits, power supply circuit and display device.
Background technique
Thin film transistor liquid crystal display (Thin Film Transistor Liquid Crystal Display, TFT-
LCD) panel is one of the major product that current flat panel is shown, has become weight in present information scientific and technological industry and video product
The display platform wanted.The main driving principle of TFT-LCD display panel includes: system board by picture element signal and control signal etc.
Data and power supply are connected by the connector on wire rod and printed circuit board (Printed Circuit Board, PCB),
Data through pcb board, pass through source after logic card (Timing Controller, TCON) the integrated circuit processing on pcb board
Grade film driving chip (Source-Chip on Film, S-COF) and grid film driving chip (Gate-Chip on
Film, G-COF) it is connect with viewing area, thus power supply and data needed for obtaining viewing area, to realize that image is shown.
At present display panel be switched on when, due to TCON need to carry out software reading and built-in potential foundation need the time, can
TCON can occur not yet start to work normally, but S-COF or G-COF have started, so as to cause picture it is abnormal
Situation generates.
Summary of the invention
Based on this, it is necessary to the picture caused by for normal operating conditions cannot be entered simultaneously because of TCON and driving chip
The situation of face exception,
The present invention provides a kind of power-supplying circuits, comprising:
The input terminal of acquisition unit, the acquisition unit is electrically connected with logic card, for acquiring institute after logic card powers on
The real work voltage for stating logic card generates according to the real work voltage of the logic card and exports trigger signal；With
The first input end of judging unit, the judging unit connects to power supply, the second input terminal of the judging unit
It is electrically connected with the output end of the acquisition unit, the third input end grounding of the judging unit, the output of the judging unit
End is electrically connected with driving chip, and the judging unit judges the touching for receiving the trigger signal and supply voltage
Whether the voltage of signalling is greater than threshold voltage, and when the voltage for determining the trigger signal is greater than the threshold voltage,
The supply voltage is supplied to the driving chip.
The judging unit includes: in one of the embodiments,
Compare branch, the first input end of the relatively branch is electrically connected with the output end of the acquisition unit, the ratio
Compared with the second input end grounding of branch, for receiving and judging whether the voltage of the trigger signal is greater than the threshold voltage,
And when the voltage for determining the trigger signal is greater than the threshold voltage, described in the output end output by the relatively branch
Trigger signal；
Branch, the first input end of the triggering branch and the power electric connection are triggered, it is described to trigger the second of branch
The output end of input terminal branch compared with described is electrically connected, the third input end grounding of the triggering branch, described for receiving
Trigger signal and supply voltage, and switch control signal is generated according to the trigger signal and supply voltage；And
First input of switching branches, the first input end of the switching branches and the power supply and the triggering branch
End electrical connection, the second output terminal of the switching branches are electrically connected with the output end of the triggering branch, the switching branches
Output end is electrically connected with driving chip.
The relatively branch includes: in one of the embodiments,
Capacitor, the first end of the capacitor are electrically connected with the output end of the acquisition unit, the second termination of the capacitor
Ground；And
Diode, the cathode of the diode are electrically connected with the first end of the capacitor and the output end of the acquisition unit
It connects, the anode of the diode is electrically connected with the second input terminal of the triggering branch.
The triggering branch includes: in one of the embodiments,
Trigger, the set end of the trigger and the first input end of the power supply and the switching circuit are electrically connected
It connects, the triggering end of the trigger is electrically connected with the anode of the diode, the positive output end of the trigger and the ratio
The second input terminal compared with branch is electrically connected；And
Resistance, the first end of the resistance and the positive output end of the trigger and it is described compared with branch it is second defeated
Enter end electrical connection, the second end ground connection of the resistance.
The switching branches include switching tube in one of the embodiments, the grid of the switching tube and the triggering
The first end connection of the positive output end and the resistance of device, the drain electrode of the switching tube and the power supply and the triggering
The set end of device is electrically connected, and the source electrode of the switching tube is electrically connected with the driving chip.
The switching tube is N type switch tube in one of the embodiments,.
The triggering branch includes: in one of the embodiments,
Trigger, the set end of the trigger and the first input end of the power supply and the switching circuit are electrically connected
It connects, the triggering end of the trigger is electrically connected with the anode of the diode, the inverse output terminal of the trigger and the ratio
The second input terminal compared with branch is electrically connected；And
Resistance, the first end of the resistance and the inverse output terminal of the trigger and it is described compared with branch it is second defeated
Enter end electrical connection, the second end ground connection of the resistance.
The switching branches include switching tube in one of the embodiments, the grid of the switching tube and the triggering
The first end connection of the positive output end and the resistance of device, the source electrode of the switching tube and the power supply and the triggering
The set end of device is electrically connected, and the drain electrode of the switching tube is electrically connected with the driving chip.
The switching tube is p-type switching tube in one of the embodiments,.
The switching tube is triode or field-effect tube in one of the embodiments,.
The trigger signal is to state the real work voltage of logic card in one of the embodiments,.
Based on the same inventive concept, the embodiment of the invention also provides a kind of power supply circuit, the power supply circuit includes using
The power-supplying circuit described in the power supply and any of the above-described embodiment that supply voltage is provided.
Based on the same inventive concept, the embodiment of the invention also provides a kind of display device, the display device includes patrolling
Power-supplying circuit described in volume plate, the power supply for providing supply voltage and any of the above-described embodiment.
To sum up, the embodiment of the invention provides a kind of power-supplying circuit, power supply circuit and display devices.The confession is automatically controlled
Circuit processed includes acquisition unit and judging unit.The input terminal of the acquisition unit is electrically connected with logic card, in logic card
After powering on, the real work voltage of the logic card is acquired, is generated according to the real work voltage of the logic card and exports touching
It signals.The first input end of the judging unit connects to power supply, the second input terminal of the judging unit and the acquisition
The output end of unit is electrically connected, the third input end grounding of the judging unit, the output end and driving core of the judging unit
Piece electrical connection；The judging unit judges the electricity of the trigger signal for receiving the trigger signal and supply voltage
Whether pressure is greater than threshold voltage, and when the voltage for determining the trigger signal is greater than the threshold voltage, by the power supply
Voltage is supplied to the driving chip.In the present invention, by the real work voltage of acquisition logic plate, and according to the practical work
Make voltage and generate trigger signal, so that the judging unit judges the logic card according to the trigger signal and threshold voltage
Whether real work voltage reaches normal working voltage range, and when the voltage for determining the trigger signal is greater than the threshold value
When the real work voltage of voltage, i.e., the described logic card reaches normal working voltage range, the supply voltage is supplied to institute
Driving chip is stated, avoids generating in booting since TCON not yet starts to work normally, and S-COF or G-COF have begun work
The situation of picture exception caused by making.
Detailed description of the invention
Fig. 1 is the electrical structure schematic diagram of display panel；
Fig. 2 is a kind of structural schematic diagram of power-supplying circuit provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of another power-supplying circuit provided in an embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram of power supply circuit provided in an embodiment of the present invention；
Fig. 5 is a kind of electrical structure schematic diagram of display device provided in an embodiment of the present invention.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this hair
It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be not
Similar improvement is done in the case where violating intension of the present invention, therefore the present invention is not limited to the specific embodiments disclosed below.
As shown in Figure 1, (Thin Film Transistor Liquid Crystal Display, film are brilliant by TFT-LCD
Body pipe liquid crystal display) it is one of the principal item that current flat panel is shown, have become modern IT, important in video product
Display platform.R/G/B picture element signal, control signal and power supply are passed through signal wire by the main driving principle of TFT-LCD, system board
It is connected with the connector on pcb board, by TCON (Timing Controller, sequence controller) IC on pcb board
After (Integrated Circuit, integrated circuit) processing, through pcb board, pass through S-COF (Source-Chip on Film, source
Pole driving chip) and G-COF (Gate-Chip on Film grid drive chip) connect with viewing area so that LCD obtain
Required power supply and signal.
At present in design, the supply voltage of Power (power supply) IC output is connected to TCON IC and S-COF and G- simultaneously
COF, as numerical digit power supply, TCON needs to carry out software reading when due to booting and built-in potential foundation needs the time, because
This may occur TCON and not yet start to work normally, and S-COF or G-COF have started, so as to cause picture is generated
Abnormal situation.
In view of the above-mentioned problems, the present invention provides a kind of power-supplying circuits 100.Refer to Fig. 2, the power supply control electricity
Road 100 includes acquisition unit 110 and judging unit 120.
The input terminal of the acquisition unit 110 is electrically connected with logic card, for after logic card powers on, acquiring the logic
The real work voltage of plate generates according to the real work voltage of the logic card and exports trigger signal.
The first input end of the judging unit 120 connects to power supply, the second input terminal of the judging unit 120 and institute
The output end for stating acquisition unit 110 is electrically connected, the third input end grounding of the judging unit 120, the judging unit 120
Output end is electrically connected with driving chip, and the judging unit 120 is used to receive the trigger signal and supply voltage VDD, and
Judge whether the voltage of the trigger signal is greater than threshold voltage, and when the voltage for determining the trigger signal is greater than the threshold
When threshold voltage, the supply voltage VDD is supplied to the driving chip.
It is appreciated that by the real work voltage of acquisition logic plate, and generated and triggered according to the real work voltage
Signal, so that the judging unit 120 judges the real work electricity of the logic card according to the trigger signal and threshold voltage
Whether pressure reaches normal working voltage range, and when the voltage for determining the trigger signal is greater than the threshold voltage, i.e. institute
When stating the real work voltage of logic card and reaching normal working voltage range, the supply voltage VDD is supplied to the driving
Chip, so that the moment of system electrification, the numerical digit that Power IC is temporarily supplied to S-COF and G-COF is disconnected for electrical connection, to
After the operation is stable of the part TCON and Power IC, then by Power IC and the numerical digit of S-COF and G-COF for being electrically connected conducting, from
And display caused by TCON is not worked normally also when avoiding booting, and S-COF and G-COF have started is abnormal.
The judging unit 120 includes comparing branch 121, triggering branch 122 and switch branch in one of the embodiments,
Road 123.
The first input end of the relatively branch 121 is electrically connected with the output end of the acquisition unit 110, the relatively branch
Second input end grounding on road 121, for receiving and judging whether the voltage of the trigger signal is greater than the threshold voltage, and
When the voltage for determining the trigger signal is greater than the threshold voltage, institute is exported by the output end of the relatively branch 121
State trigger signal.
The first input end of the triggering branch 122 and the power electric connection, the second input of the triggering branch 122
Hold the output end electrical connection of the branch 121 compared with described, the third input end grounding of the triggering branch, for receiving the touching
It signals and supply voltage VDD, and switch control signal is generated according to the trigger signal and supply voltage VDD.
The first input end of the first input end and the power supply of the switching branches 123 and the triggering branch 122
Electrical connection, the second output terminal of the switching branches 123 are electrically connected with the output end of the triggering branch 122, the switch branch
The output end on road 123 is electrically connected with driving chip.
It is appreciated that being compared with the threshold voltage by the relatively branch 121 voltage of the trigger signal
Compared with, and when the voltage for determining the trigger signal is greater than the threshold voltage, the output end by the relatively branch 121 is defeated
The trigger signal out.The triggering branch 122 is in the trigger signal input for detecting rising edge, according to the power supply electricity
VDD is pressed to generate the control signal of high level, the switching branches 123 are according to the control signal conduction of the high level, thus real
Existing power supply is that driving chip is powered, and is avoided because TCON and driving chip are the disadvantage caused by capable of normally entering working condition simultaneously
End.
The relatively branch 121 includes capacitor C and diode D1 in one of the embodiments:
The first end of the capacitor C is electrically connected with the output end of the acquisition unit 110, the second termination of the capacitor C
Ground；And
The cathode of the diode D1 is electrically connected with the first end of the capacitor C and the output end of the acquisition unit 110
It connects, the anode of the diode D1 is electrically connected with the second input terminal of the triggering branch 122.
It is appreciated that the diode D1 has the function of one-way conduction, be less than when the voltage of the diode D1 cathode or
When threshold voltage equal to the diode D1, the diode D1 cut-off.When the voltage of the diode D1 cathode is greater than institute
When stating the threshold voltage of diode D1, the diode D1 is reversed breakdown, switchs on state by off state.The present embodiment
In, when the high level voltage of the trigger signal, diode D1 described in ability reverse breakdown, to trigger the triggering branch
122 generate the switch control signal of high level, so that the switching branches 123 are led according to the switch control signal of the high level
It is logical, the supply voltage VDD is supplied to driving chip.
The triggering branch 122 includes trigger D2 and resistance R in one of the embodiments,.
The set end Q of the trigger D2 is electrically connected with the first input end of the power supply and the switching circuit, institute
State the triggering end C and the diode D1 of trigger D2 anode be electrically connected, the positive output end of the trigger D2 with it is described
Compare the second input terminal electrical connection of branch 121.
The first end of the resistance R and the positive output end of the trigger D2 and it is described compared with branch 121 second
Input terminal electrical connection, the second end ground connection of the resistance R.
It is appreciated that the trigger D2 is rising edge flip-flops, i.e., when the triggering end C of the trigger detect it is described
When the rising edge of trigger signal, the value of its set end Q is assigned to the positive output end Q of the trigger D2.In the present embodiment, when
After the diode D1 is reversed breakdown, the triggering end C of the trigger D2 detects the rising edge of the trigger signal, the touching
Hair device D2 is triggered, the high level signal of its set end Q is assigned to its positive output end Q, generates the switch control of high level
Signal exports the switch control signal of high level by the positive output end Q of the trigger D2.
The triggering branch 122 includes trigger D2, phase inverter D3 and resistance R in one of the embodiments, is referred to
Fig. 3.
The set end Q of the trigger D2 is electrically connected with the first input end of the power supply and the switching circuit, institute
The anode for stating the triggering end C and the diode D1 of trigger D2 is electrically connected.
The input terminal of the phase inverter D3 and the inverse output terminal Q ' of the trigger D2 be electrically connected, the phase inverter D3
Second input terminal of output end branch 121 compared with described is electrically connected.
The first end of the resistance R and the phase inverter D3 output end and it is described compared with branch 121 the second input terminal
Electrical connection, the second end ground connection of the resistance R.
It is appreciated that the trigger D2 is rising edge flip-flops D2, i.e., when the triggering end C of the triggering detect it is described
When the rising edge of trigger signal, the value of its set end Q is assigned to the inverse output terminal Q ' of the trigger D2.In the present embodiment,
After the diode D1 is reversed breakdown, the triggering end C of the trigger D2 detects the rising edge of the trigger signal, described
Trigger D2 is triggered, and will be assigned to its inverse output terminal Q ' after the high level signal reverse process of its set end Q, generates low electricity
Flat switch control signal exports low level M signal by the inverse output terminal Q ' of the trigger D2, described low
The M signal of level is in the control signal for after the phase inverter D3 reverse process, obtaining high level, so that described
Switching branches 123 are connected according to the switch control signal of the high level, and the supply voltage VDD is supplied to driving chip
In one of the embodiments, the switching branches 123 include switching tube M, the grid of the switching tube M with it is described
The first end of the positive output end Q and the resistance R of trigger D2 connects, the drain electrode of the switching tube M and the power supply with
And the set end Q electrical connection of the trigger D2, the source electrode of the switching tube M are electrically connected with the driving chip.
The switching tube M is N type switch tube in one of the embodiments,.In the present embodiment, when the switch control is believed
When number being high level signal, the supply voltage VDD is supplied to the driving chip by switching tube M conducting.It is opened described in room
When pass control signal is low level signal, the switching tube M is disconnected.
The switching tube M is triode or field-effect tube in one of the embodiments,.It is appreciated that passing through triode
Or field-effect tube, the on-off of control circuit can be realized, to control the power supply as driving chip power supply.In addition, institute
Stating switching tube M can be using other component with switching function, such as relay.
The trigger signal is the real work voltage for stating logic card in one of the embodiments,.It should be noted
It is that, if using the real work voltage for stating logic card as trigger signal, threshold power should be used to be equal to supply voltage VDD
Diode D1, to prevent the real work voltage of the logic card to be also not up to normal working voltage range, just described in triggering
Judging unit 120 is connected, and is that S-COF and G-COF powers using power supply.
It is appreciated that the acquisition unit 110 can be set in the logic card, it can also be independently of the logic card
It is additionally carried out setting.
For ease of description, below by taking power-supplying circuit 100 shown in Fig. 2 as an example, its working principle is carried out specific
It introduces.Wherein, the switching tube M is N-type field-effect tube, and trigger D2 is rising edge flip-flops.
The moment that display panel powers on, the switch control signal are low level, and the switching tube M is disconnected, S-COF and G-
COF, which does not receive supply voltage VDD, S-COF and G-COF, to be started.
When TCON complete software read and built-in potential establish and etc., after starting normal work, acquisition unit 110 export
Trigger signal be high level signal, when the voltage value of the trigger signal of high level is more than the breakdown reverse voltage of diode D1
When, diode D1 is breakdown, and trigger D2 detects the rising edge of trigger signal, at this time the supply voltage VDD assignment of set end Q
To positive output end Q, the switch control signal of the positive output end Q output high level of trigger D2, the grid of the switching tube M
For high level, the switching tube M conducting, the power supply is that S-COF and G-COF provide supply voltage by the switching tube M
VDD, S-COF and G-COF start work after receiving supply voltage VDD, and entire display panel enters normal operating conditions at this time.
Based on the same inventive concept, the embodiment of the invention also provides a kind of power supply circuits, refer to Fig. 4, the power supply
Circuit includes for providing the power supply 300 and power-supplying circuit 100 of supply voltage VDD.The power-supplying circuit 100 wraps
Include the acquisition unit 110 and the judging unit 120.
The input terminal of the acquisition unit 110 is electrically connected with logic card, for after logic card powers on, acquiring the logic
The real work voltage of plate generates according to the real work voltage of the logic card and exports trigger signal.
The first input end of the judging unit 120 is connect with the power supply, the second input terminal of the judging unit 120
It is electrically connected with the output end of the acquisition unit 110, the third input end grounding of the judging unit 120, the judging unit
120 output end is electrically connected with driving chip, and the judging unit 120 is for receiving the trigger signal and supply voltage
VDD, and judge whether the voltage of the trigger signal is greater than threshold voltage, and when the voltage for determining the trigger signal is greater than
When the threshold voltage, the supply voltage VDD is supplied to the driving chip.
The judging unit 120 includes comparing branch 121, triggering branch 122 and switch branch in one of the embodiments,
Road 123.
The first input end of the relatively branch 121 is electrically connected with the output end of the acquisition unit 110, the relatively branch
Second input end grounding on road 121, for receiving and judging whether the voltage of the trigger signal is greater than the threshold voltage, and
When the voltage for determining the trigger signal is greater than the threshold voltage, institute is exported by the output end of the relatively branch 121
State trigger signal.
The first input end of the triggering branch 122 and the power electric connection, the second input of the triggering branch 122
Hold the output end electrical connection of the branch 121 compared with described, the third input end grounding of the triggering branch, for receiving the touching
It signals and supply voltage VDD, and switch control signal is generated according to the trigger signal and supply voltage VDD.
The first input end of the first input end and the power supply of the switching branches 123 and the triggering branch 122
Electrical connection, the second output terminal of the switching branches 123 are electrically connected with the output end of the triggering branch 122, the switch branch
The output end on road 123 is electrically connected with driving chip.
The relatively branch 121 includes capacitor C and diode D1, the triggering branch 122 in one of the embodiments,
Including trigger D2 and resistance R, the switching branches 123 include switching tube M.
The first end of the capacitor C is electrically connected with the output end of the acquisition unit 110, the second termination of the capacitor C
Ground.
The cathode of the diode D1 is electrically connected with the first end of the capacitor C and the output end of the acquisition unit 110
It connects, the anode of the diode D1 is electrically connected with the triggering end C of the trigger D2.
The set end Q of the trigger D2 is electrically connected with the drain electrode of the power supply and the switching tube M, the trigger
The positive output end Q of D2 is electrically connected with the grid of the switching tube M.
The first end of the resistance R is electrically connected with the grid of the positive output end Q of the trigger D2 and switching tube M,
The second end of the resistance R is grounded.
The grid of the switching tube M is connect with the first end of the positive output end of the trigger D2 and the resistance R,
The drain electrode of the switching tube M is electrically connected with the set end Q of the power supply and the trigger D2, the source electrode of the switching tube M
It is electrically connected with the driving chip.
Based on the same inventive concept, the embodiment of the invention also provides a kind of display devices, refer to Fig. 5, the display
Device includes logic card 200, for providing the power supply 300 and power-supplying circuit 100 of supply voltage VDD.The confession is automatically controlled
Circuit 100 processed includes the acquisition unit 110 and the judging unit 120.
The input terminal of the acquisition unit 110 is electrically connected with the logic card, for after logic card powers on, described in acquisition
The real work voltage of logic card generates according to the real work voltage of the logic card and exports trigger signal.
The first input end of the judging unit 120 is connect with the power supply, the second input terminal of the judging unit 120
It is electrically connected with the output end of the acquisition unit 110, the third input end grounding of the judging unit 120, the judging unit
120 output end is electrically connected with driving chip, and the judging unit 120 is for receiving the trigger signal and supply voltage
VDD, and judge whether the voltage of the trigger signal is greater than threshold voltage, and when the voltage for determining the trigger signal is greater than
When the threshold voltage, the supply voltage VDD is supplied to the driving chip.
To sum up, the embodiment of the invention provides a kind of power-supplying circuit 100, power supply circuit and display devices.The confession
Electric control circuit 100 includes acquisition unit 110 and judging unit 120.The input terminal of the acquisition unit 110 is electrically connected with logic card
It connects, for after logic card powers on, acquiring the real work voltage of the logic card, according to the real work of logic card electricity
Pressure generates and exports trigger signal.The first input end of the judging unit 120 connects to power supply, the judging unit 120
Second input terminal is electrically connected with the output end of the acquisition unit 110, the third input end grounding of the judging unit 120, institute
The output end for stating judging unit 120 is electrically connected with driving chip；The judging unit 120 for receive the trigger signal and
Supply voltage VDD, and judge whether the voltage of the trigger signal is greater than threshold voltage, and when the judgement trigger signal
When voltage is greater than the threshold voltage, the supply voltage VDD is supplied to the driving chip.In the present invention, pass through acquisition
The real work voltage of logic card, and trigger signal is generated according to the real work voltage, so that the judging unit 120
Judge whether the real work voltage of the logic card reaches normal working voltage range according to the trigger signal and threshold voltage,
And when the voltage for determining the trigger signal is greater than the threshold voltage, i.e., the real work voltage of the described logic card reaches just
When normal operating voltage range, the supply voltage VDD is supplied to the driving chip, avoids generating in booting due to TCON
Not yet start to work normally, and S-COF or G-COF have started the situation of caused picture exception.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of power-supplying circuit characterized by comprising
The input terminal of acquisition unit, the acquisition unit is electrically connected with logic card, for being patrolled after logic card powers on described in acquisition
The real work voltage for collecting plate, generates according to the real work voltage of the logic card and exports trigger signal；With
The first input end of judging unit, the judging unit connects to power supply, the second input terminal of the judging unit and institute
State acquisition unit output end electrical connection, the third input end grounding of the judging unit, the output end of the judging unit with
Driving chip electrical connection, the judging unit judge the triggering letter for receiving the trigger signal and supply voltage
Number voltage whether be greater than threshold voltage, and when the voltage for determining the trigger signal is greater than the threshold voltage, by institute
It states supply voltage and is supplied to the driving chip.
2. power-supplying circuit as described in claim 1, which is characterized in that the judging unit includes:
Compare branch, the first input end of the relatively branch is electrically connected with the output end of the acquisition unit, the relatively branch
Second input end grounding on road, for receiving and judging whether the voltage of the trigger signal is greater than the threshold voltage, and
When determining that the voltage of the trigger signal is greater than the threshold voltage, the triggering is exported by the output end of the relatively branch
Signal；
Trigger branch, the first input end of the triggering branch and the power electric connection, the second input of the triggering branch
Hold the output end electrical connection of the branch compared with described, the third input end grounding of the triggering branch, for receiving the triggering
Signal and supply voltage, and switch control signal is generated according to the trigger signal and supply voltage；And
The first input end electricity of switching branches, the first input end of the switching branches and the power supply and the triggering branch
Connection, the second output terminal of the switching branches are electrically connected with the output end of the triggering branch, the output of the switching branches
End is electrically connected with driving chip.
3. power-supplying circuit as claimed in claim 2, which is characterized in that it is described relatively branch include:
Capacitor, the first end of the capacitor are electrically connected with the output end of the acquisition unit, the second end ground connection of the capacitor；With
And
Diode, the cathode of the diode are electrically connected with the output end of the first end of the capacitor and the acquisition unit,
The anode of the diode is electrically connected with the second input terminal of the triggering branch.
4. power-supplying circuit as claimed in claim 3, which is characterized in that the triggering branch includes:
Trigger, the set end of the trigger are electrically connected with the first input end of the power supply and the switching circuit, institute
The triggering end for stating trigger is electrically connected with the anode of the diode, the positive output end of trigger branch compared with described
The second input terminal electrical connection；And
Resistance, the first end of the resistance and the positive output end of the trigger and it is described compared with branch the second input terminal
Electrical connection, the second end ground connection of the resistance.
5. power-supplying circuit as claimed in claim 4, which is characterized in that the switching branches include switching tube, described to open
Close pipe grid connect with the first end of the positive output end of the trigger and the resistance, the drain electrode of the switching tube and
The electrical connection of the set end of the power supply and the trigger, the source electrode of the switching tube are electrically connected with the driving chip.
6. power-supplying circuit as claimed in claim 5, which is characterized in that the switching tube is N type switch tube.
7. such as power-supplying circuit described in claim 5 or 6, which is characterized in that the switching tube is triode or field-effect
Pipe.
8. power-supplying circuit as described in claim 1, which is characterized in that the trigger signal is the reality of the logic card
Operating voltage.
9. a kind of power supply circuit, which is characterized in that the power supply circuit includes the power supply and such as power for providing supply voltage
Benefit requires power-supplying circuit described in any claim of 1-8.
10. a kind of display device, which is characterized in that the display device includes logic card, for providing the power supply of supply voltage
And the power-supplying circuit as described in any claim of claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910216076.0A CN109801604A (en) | 2019-03-21 | 2019-03-21 | power supply control circuit, power supply circuit and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910216076.0A CN109801604A (en) | 2019-03-21 | 2019-03-21 | power supply control circuit, power supply circuit and display device |
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| CN109801604A true CN109801604A (en) | 2019-05-24 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910216076.0A Pending CN109801604A (en) | 2019-03-21 | 2019-03-21 | power supply control circuit, power supply circuit and display device |
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Cited By (1)
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| CN111816134A (en) * | 2020-07-31 | 2020-10-23 | 重庆惠科金渝光电科技有限公司 | Display panel's drive circuit and display panel |
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