CN106448586A - Liquid crystal apparatus and liquid crystal screen power supply switch control method - Google Patents
Liquid crystal apparatus and liquid crystal screen power supply switch control method Download PDFInfo
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- CN106448586A CN106448586A CN201610854498.7A CN201610854498A CN106448586A CN 106448586 A CN106448586 A CN 106448586A CN 201610854498 A CN201610854498 A CN 201610854498A CN 106448586 A CN106448586 A CN 106448586A
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- Prior art keywords
- switch
- liquid crystal
- power supply
- crystal display
- controlled switch
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
Abstract
The invention provides a liquid crystal apparatus and liquid crystal screen power supply switch control method. The control method comprises the following steps: using a first controlled switch with slow varying capacitance to control the connection and disconnection of the power supply with the power supply interface of the liquid crystal screen; and arranging a second controlled switch without slow varying capacitance to be in serial connection with the first controlled switch so that both can work cooperatively to control the connection and disconnection of the power supply with the power supply interface of the crystal liquid screen. With the control method of the invention, it is possible to better meet the power supply requirement of a liquid crystal screen both at the starting stage and the closing stage, therefore, improving the user's use experience.
Description
Technical field
The present invention relates to the method for controlling switch of the power supply supply of liquid-crystal apparatus, more particularly, to liquid crystal display.
Background technology
Referring to Fig. 1, existing liquid-crystal apparatus 10a generally includes liquid crystal display 3 and for providing the power supply of liquid crystal display 3 to supply
The controlled switch 1 of switch control rule.This controlled switch 1 specifically includes the power supply supply port that string is located at power supply PWRin and liquid crystal display 3
Between power switch 11, for the driving 12 driving this power switch 11 to close/disconnect, and be connected to this power switch 11
Control port Ctrl and the input port IN of this power switch 11 between gradual electric capacity 13.Referring to existing shown in Fig. 2
The circuit diagram of the method for controlling switch of power supply supply of liquid crystal display, aforesaid power switch 11 is substantially by P-channel MOS chip
N103, electric capacity C253 and electric capacity C248 are constituted.Aforesaid drive 12 substantially by NPN transistor V32, resistance R273, electric capacity
C251, resistance R272, resistance R274, electric capacity C249 and electric capacity C252 are constituted.Aforesaid gradual electric capacity 13 is substantially by electric capacity C250
Constitute.Adopt control signal LVDS_PWR_EN with controlling transistor V32 conduction and cut-off, and then can control MOS chip N103's
Conduction and cut-off is so that power supply supplies the power supply supply port LVDSVDD conduction and cut-off of 12VS and liquid crystal display 3.
A lot of liquid-crystal apparatus, the liquid crystal display 3 of such as TV, the power supply supply power supply of start-up phase and shut-down-phase is had
Specific requirement.Specifically, in start-up phase, moment impact electric current will requirement up to specification：Rise time is typically in 0.5 milli
Second is between 30 milliseconds；In shut-down-phase it is impossible to there be concussion.The power supply supply curve of start process shown in Figure 3, adopts
Existing method of controlling switch, liquid crystal display 3 has one smoothly to delay power up, and power supply supplies the rise time of 12V voltage about
For 2.8 milliseconds, disclosure satisfy that the requirement of start-up phase.The power supply supply curve of shutdown process shown in Figure 4, using existing
Method of controlling switch, the power supply of liquid crystal display 3 supplies in turn off process, there is oscillation, supply voltage drops to from 12V
8.3V about, then rebound 12V it is impossible to meet the requirement of shut-down-phase again, and occur that flower screen or display affect extremely
To Consumer's Experience.It can be seen that, it is necessary that the method for controlling switch of the power supply supply to existing liquid crystal display improves in fact.
Content of the invention
The technical problem to be solved in the present invention is to overcome the shortcomings of that above-mentioned prior art exists, and proposes a kind of liquid crystal display
Power supply supply method of controlling switch, can meet well liquid crystal display start-up phase and shut-down-phase power supply supply
Require, improve Consumer's Experience.
The technical scheme that the present invention is directed to above-mentioned technical problem and proposes includes, and proposes a kind of power supply supply of liquid crystal display
Method of controlling switch, including：Supply power supply and the power supply of liquid crystal display is controlled to supply using the first controlled switch having gradual electric capacity
ON/OFF to port；And do not had gradual electric capacity the second controlled switch be located at this first controlled switch string together with,
The two Collaborative Control supplies the ON/OFF of power supply and the power supply supply port of liquid crystal display.
The technical scheme that the present invention is directed to above-mentioned technical problem and proposes also includes, and proposes a kind of liquid-crystal apparatus, including：Liquid
Brilliant screen and the first controlled switch having gradual electric capacity, this first controlled switch is used for controlling supply power supply and the power supply of liquid crystal display to supply
To the ON/OFF of port, and do not have the second controlled switch of gradual electric capacity, this second controlled switch first controlled is opened with this
Close string and be located at together, the two Collaborative Control supplies the ON/OFF of power supply and the power supply supply port of liquid crystal display.
Compared with prior art, the method for controlling switch of the power supply supply of the liquid crystal display of the present invention passes through dexterously to set up not
Have the second controlled switch of gradual electric capacity, make the second controlled switch and Collaborative Control both the first controlled switch, can eliminate straight
In the stream shutdown moment, the problem of just power down after the power supply service voltage concussion several times of liquid crystal display, such that it is able to be effectively prevented from
In direct current shutdown process, oscillation produces impact to liquid crystal display end-apparatus part, it is to avoid show the client Yi Fa such as flower shields or display is abnormal
The appearance of existing bad problem, the power supply supply that can meet liquid crystal display well in start-up phase and shut-down-phase requires,
Improve Consumer's Experience.
Brief description
Fig. 1 is the block diagram of existing display device.
Fig. 2 is the circuit diagram of the method for controlling switch of power supply supply of existing liquid crystal display.
Fig. 3 is the power supply supply curve of the start process using existing method of controlling switch.
Fig. 4 is the power supply supply curve of the shutdown process using existing method of controlling switch.
Fig. 5 is conducting resistance and drain current, the relation curve of conducting voltage of power switch.
Fig. 6 is the block diagram of the display device embodiment of the present invention.
Fig. 7 is the circuit diagram of the method for controlling switch of power supply supply of the liquid crystal display of the present invention.
Fig. 8 is the power supply supply curve of the shutdown process using method of controlling switch of the present invention.
Fig. 9 is the block diagram of another embodiment of display device of the present invention.
Specific embodiment
Below in conjunction with accompanying drawing, the present invention is given with further elaboration.
Referring to Fig. 2, Fig. 2 is the circuit diagram of the method for controlling switch of power supply supply of existing liquid crystal display.By to this electricity
Road figure carries out careful test and analysis, the inventors discovered that：In connection, liquid crystal display 3 is shut down it may appear that reforming phenomena；Disconnected
Open liquid crystal display 3 to be shut down, power supply supply 12V Voltage Drop steadily, is not in reforming phenomena.Consider：Power supply supplies 12V
It is used to power conversion chip within liquid crystal display 3 (for example：DC-DC etc.) power supply.The present inventor speculates：During shutdown, due to
The presence of electric capacity C250 is so that the pressure reduction Vgs pressure reduction of the grid G of MOS chip N103 and source S drops slowly.With pressure reduction
Vgs tapers into, in conjunction with the relation curve of conducting resistance and the drain current of the power switch shown in Fig. 5, conducting voltage, can
Know：Conducting resistance Rds (on) of MOS chip N103 starts to increase, and drain current Id is almost unchanged, and MOS chip N103 divides
Buckling is big, and therefore output voltage LVDSVDD diminishes, and that is, 12V starts to fall.But, now liquid crystal display 3 is still located in working order,
Drop to a certain degree with 12V, liquid crystal display 3 turns off, now it is considered that the confession electric loading of 12V is in high-impedance state, drain electrode
Electric current Id reduces rapidly, and the partial pressure of MOS chip N103 reduces, and supply voltage raises, and causes to circulate with this, leads to concussion to produce,
Concrete waveform is referring to Fig. 4.
Referring to Fig. 6, Fig. 6 is the block diagram of the display device embodiment of the present invention.The present invention proposes a kind of display device 10, example
As：LCD TV, it generally comprises：First controlled switch 1, the second controlled switch 2 and liquid crystal display 3.It is understood that with front
State the prior art shown in Fig. 1 to compare, improvements include：It is additionally arranged this second controlled switch 2, this second controlled switch 2 is gone here and there
It is located between this first controlled switch 1 and this liquid crystal display 3.Specifically, this first controlled switch 1 includes：First power switch
11, first drives 12 gentle change electric capacity 13.This gradual electric capacity 13 is connected to control port Ctrl and this work(of this power switch 11
Between the input port IN of rate switch 11.This second controlled switch 2 includes：Second power switch 21 and second drives 22.Wherein,
This second power switch 21 string is located between this first power switch 11 and power supply supply port of this liquid crystal display 3.Only at two
When power switch 11,21 all closes, power supply supplies the power supply supply port that PWRin just can be sent to this liquid crystal display 3.Two drivings
12nd, 22 are controlled by same control signal Pctrl.By this second controlled switch 2 compared with this first controlled switch 1 it is seen that：This
There is not the gradual electric capacity 13 in this first controlled switch 1 in two controlled switch 2.
Referring to Fig. 7, Fig. 7 is the circuit diagram of the method for controlling switch of power supply supply of the liquid crystal display of the present invention.This first work(
Rate switch 11 is substantially made up of P-channel MOS chip N102, electric capacity C238 and electric capacity C239.This first driving 12 is substantially by NPN type
Transistor V30, resistance R275, electric capacity C236, resistance R267, resistance R266, electric capacity C237 and electric capacity C240 are constituted.This gradual electricity
Hold 13 to be substantially made up of electric capacity C235.Second power switch 21 is substantially by P-channel metal-oxide-semiconductor N40, electric capacity C247 and electric capacity C241 structure
Become.This second driving 22 is substantially by NPN transistor V31, resistance R270, electric capacity C244, resistance R269, resistance R271, electric capacity
C242 and electric capacity C245 is constituted.
In this first controlled switch 1, electric capacity C235 selects the electric capacity of 2.2uF/10V specification.P-channel MOS chip N102
From model AO4459, during voltage Vgs=0 when between its grid and source electrode, end between drain electrode and source electrode；As voltage Vgs
<During -1.5V, begin to turn between drain electrode and source electrode.When control signal LVDS_PWR_EN（I.e. aforesaid control signal Pctrl）
During for low level, voltage Vgs=0, metal-oxide-semiconductor is off state.When control signal LVDS_PWR_EN is high level, voltage
Vgs=-6V, metal-oxide-semiconductor is in the conduction state.It can be seen that, this circuit can pass through master controller（Not shown）Output port provide
Whether control signal LVDS_PWR_EN is controlling conducting and the shutoff of MOS chip N102, thus controlling power supply supply 12VS can
It is sent to the power supply supply port of this liquid crystal display 3.
In this second controlled switch 2, model AO3401L that P-channel metal-oxide-semiconductor N40 selects, when control signal LVDS_
When PWR_EN is low level, voltage Vgs=0, metal-oxide-semiconductor is off state.When control signal LVDS_PWR_EN is high level,
Voltage Vgs=-6V, metal-oxide-semiconductor is in the conduction state.It can be seen that, this circuit can pass through master controller（Not shown）Output port carry
For control signal LVDS_PWR_EN to control conducting and the shutoff of metal-oxide-semiconductor N40, thus controlling power supply supply 12VS whether can
Enough it is sent to the power supply supply port of this liquid crystal display 3.
Compared with prior art shown in Fig. 2, in the electricity of the method for controlling switch of the power supply supply of the liquid crystal display of the present invention
Lu Zhong, the voltage from MOS switch output is not the power supply supply port being directly sent to liquid crystal display 3, but have passed through one by three
It is sent to the power supply supply port of liquid crystal display 3 after the metal-oxide-semiconductor N40 that pole pipe V31 controls.In the figure 7, triode V30, V31 be by
It is controlled by same control signal LVDS_PWR_EN.Lack one due in the front-end circuit of metal-oxide-semiconductor N40 conducting similar to electricity
Hold 235 gradual electric capacity, the therefore speed of metal-oxide-semiconductor N40 conduction and cut-off will be significantly faster than the switching speed of MOS chip N102.
On the one hand, in the start power up of liquid crystal display 3, because the gradual electric capacity 13 in the first controlled switch 1 is to power supply
Supply PWRin has gradual effect, and the power supply supply curve of liquid crystal display 3 is essentially identical with aforesaid Fig. 3, disclosure satisfy that liquid crystal display
3 start-up phase power supply supply require.On the other hand, in the shutdown power down process of liquid crystal display 3, due to the second controlled switch 2
In there is no the structure of similar gradual electric capacity 13, can rapidly switch off, the power supply supply curve of liquid crystal display 3 is as shown in figure 8, can
The power supply supply meeting liquid crystal display 3 in shut-down-phase requires.
Specifically, during start, this two triode V30 and V31 simultaneously turn on.Due to the presence of gradual electric capacity C235,
The voltage Vgs pressure reduction change of MOS chip N102 is slow, and therefore MOS chip N102 will not turn at once；And the electricity of metal-oxide-semiconductor N40
Pressure Vgs change is rapid, metal-oxide-semiconductor N40 fast conducting, and after MOS chip N102 conducting, its rear end is equivalent to a path, substantially
Do not interfere with the rise time that the power supply to liquid crystal display 3 supplies 12VS, therefore dash current remains and first controlled opened by this
Close 1 to determine.During shutdown, the left part of metal-oxide-semiconductor N40 is equivalent to pure resistor element circuit, the grid G of metal-oxide-semiconductor N40 and source S two
The voltage Vgs at end is changed to rapidly 0V, and metal-oxide-semiconductor N40 is rapid to be turned off although now MOS chip N102 does not complete switch off, but
The power supply supply port unpowered of liquid crystal display 3, concussion problem when therefore shutting down before can be inherently eliminated.
The method of controlling switch of the power supply supply of the liquid crystal display of the present invention passes through dexterously to set up and does not have the of gradual electric capacity
Two controlled switch 2, make the second controlled switch 2 and Collaborative Control both the first controlled switch 1, can eliminate the direct current shutdown moment,
The problem of just power down after the power supply service voltage concussion several times of liquid crystal display 3, such that it is able to be effectively prevented from shutting down in direct current
In journey, oscillation produces impact to liquid crystal display 3 end-apparatus part, it is to avoid show that the clients such as flower shields or display is abnormal are detectable bad
The appearance of problem, the power supply supply that can meet liquid crystal display well in start-up phase and shut-down-phase requires, and improves user
Experience.
Referring to Fig. 9, Fig. 9 is the block diagram of another embodiment of display device of the present invention.It is filled with the display shown in aforementioned Fig. 6
It is in place of the difference putting embodiment：The position of the second controlled switch 2 set up as shown in Figure 6 positioned at the first controlled switch 1
And liquid crystal display 3 between, become turn to shown in Fig. 9 before the first controlled switch 1 that is to say, that at this moment the first controlled switch 1
It is between this second controlled switch 2 and liquid crystal display 3.The power supply supply of the liquid crystal display 3 in the display device 10 shown in Fig. 9
The method of controlling switch of power supply supply of the liquid crystal display 3 in method of controlling switch and the display device 10 shown in aforesaid Fig. 6
Operation principle is essentially identical, will not be described here.
The above, only presently preferred embodiments of the present invention, are not intended to limit embodiment of the present invention, and this area is general
Logical technical staff, according to the central scope of the present invention and spirit, can very easily carry out flexible accordingly or modification, therefore this
The protection domain of invention should the protection domain required by by claims be defined.
Claims (10)
1. the method for controlling switch of the power supply supply of a kind of liquid crystal display, including：Come using the first controlled switch having gradual electric capacity
Control the ON/OFF supplying power supply and the power supply supply port of liquid crystal display it is characterised in that also including：To not have gradual electricity
Together with the second controlled switch holding is located at this first controlled switch string, the two Collaborative Control supplies the power supply of power supply and liquid crystal display
The ON/OFF of supply port.
2. according to the method for controlling switch described in claim 1 it is characterised in that making this first controlled switch and this is second controlled
Switch is controlled by same control signal.
3. first it is subject to it is characterised in that making this second controlled switch be located at this according to the method for controlling switch described in claim 1
Between control switch and this liquid crystal display；Or, so that this first controlled switch is located between this second controlled switch and this liquid crystal display.
4. it is located at confession according to the method for controlling switch described in claim 1 it is characterised in that making this first controlled switch include string
To the first power switch of power supply and the power supply supply port of liquid crystal display, for controlling this first power switch ON/OFF
First driving, and it is connected to the gradual electric capacity between the control port of this first power switch and input port；Make this second
Controlled switch includes going here and there and is located at supply power supply and the second power switch of the power supply supply port of liquid crystal display, and is used for controlling this
Second driving of the second power switch ON/OFF.
5. according to the method for controlling switch described in claim 4 it is characterised in that making this first power switch and this second power
Switch metal-oxide-semiconductor is constituted；So that this first driving and this second driving transistor is constituted, and make this first driving and this second drive
Move and be controlled by same control signal.
6. a kind of liquid-crystal apparatus, including：Liquid crystal display and the first controlled switch having gradual electric capacity, this first controlled switch is used for controlling
System supplies power supply with the ON/OFF of the power supply supply port of liquid crystal display it is characterised in that also including：Do not have gradual electric capacity
Second controlled switch, together with this second controlled switch is located at this first controlled switch string, the two Collaborative Control supply power supply with
The ON/OFF of the power supply supply port of liquid crystal display.
7. according to the liquid-crystal apparatus described in claim 6 it is characterised in that this first controlled switch and this second controlled switch are
It is controlled by same control signal.
8. according to the liquid-crystal apparatus described in claim 6 it is characterised in that this second controlled switch is located at this first controlled switch
And this liquid crystal display between；Or, this first controlled switch is located between this second controlled switch and this liquid crystal display.
9. it is located at supply power supply according to the liquid-crystal apparatus described in claim 6 it is characterised in that this first controlled switch includes string
With the first power switch of the power supply supply port of liquid crystal display, first for controlling this first power switch ON/OFF drive
Dynamic, and it is connected to the gradual electric capacity between the control port of this first power switch and input port；This second controlled switch
It is located at the second power switch of supply power supply and the power supply supply port of liquid crystal display including string, and be used for controlling this second power
Second driving of switch conduction/disconnection.
10. according to the liquid-crystal apparatus described in claim 9 it is characterised in that this first power switch and this second power switch
Constituted with metal-oxide-semiconductor；This first drive and this second driving with transistor constitute, and this first drive and this second drive controlled
In same control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610854498.7A CN106448586B (en) | 2016-09-27 | 2016-09-27 | The method of controlling switch of the power supply of liquid-crystal apparatus and liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610854498.7A CN106448586B (en) | 2016-09-27 | 2016-09-27 | The method of controlling switch of the power supply of liquid-crystal apparatus and liquid crystal display |
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| Publication Number | Publication Date |
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| CN106448586A true CN106448586A (en) | 2017-02-22 |
| CN106448586B CN106448586B (en) | 2019-06-28 |
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| CN201610854498.7A Active CN106448586B (en) | 2016-09-27 | 2016-09-27 | The method of controlling switch of the power supply of liquid-crystal apparatus and liquid crystal display |
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| CN107134266A (en) * | 2017-05-12 | 2017-09-05 | 京东方科技集团股份有限公司 | Display driver circuit, display drive method and display device |
| WO2020019604A1 (en) * | 2018-07-25 | 2020-01-30 | 惠科股份有限公司 | Power supply device and display device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106448586B (en) | 2019-06-28 |
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Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee after: Hisense Video Technology Co.,Ltd. Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee before: HISENSE ELECTRIC Co.,Ltd. |