CN103780854B - Display device standby realizing method, device and circuit and liquid crystal television - Google Patents
Display device standby realizing method, device and circuit and liquid crystal television Download PDFInfo
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Abstract
The embodiment of the invention provides a display device standby realizing circuit, method and device and a liquid crystal television. The problem that a display device is not able to start a standby state is solved, wherein the problem is caused due to the fact that when the existing display device receives a standby signal and if powering an external load is still carried out, a circuit which powers the external load in a main circuit of a power supply board of the display device does not switch off, and after the external load no longer needs power supply, the part of circuit cannot switch off. The circuit comprises a voltage output circuit which is used for outputting a voltage signal to a first comparison circuit according to current output by a first power supply, and the first comparison circuit which is used for comparing voltage received from the voltage output circuit with first preset voltage set by a setting circuit, instructing a motherboard to switch off the first power supply, and instructing the motherboard to use a second power supply to carry out power supply when the voltage received from the voltage output circuit is less than the first preset voltage, so that the display device is standby.
Description
Technical field
The present invention relates to display device technology field, more particularly, to a kind of display device realizes standby method, device, electricity
Road and LCD TV.
Background technology
It is necessary to realize idle function for all of LCD TV, domestic standard requires under city's electrical testing, liquid crystal
Television standby power is less than 0.5w, and current solution is all individually to increase standby mcu on master control borad, when standby mcu inspection
When measuring remote control standby modulating signal, send control signal, close mainboard output and the output of power panel main circuit, realize standby power
Require.
The main circuit of the power panel of LCD TV provides two-way output, and a road is output as the liquid crystal electricity under normal operating conditions
Depending in LED lamp bar power, another road is output as mainboard and the power speakers of the LCD TV under normal operating conditions；Liquid
Main board power supply (this road power output that one tunnel is output as the LCD TV under holding state is also provided in the power panel of brilliant TV
Relatively low, disclosure satisfy that the requirement of standby power) so that mainboard can receive terminate standby signal when, control liquid crystal electricity
Depending on entering normal operating conditions from holding state.Therefore, LCD TV, when receiving standby signal, can close the main electricity of power panel
The output on road, is supplied using the mainboard that the circuit for the main board power supply of the LCD TV under holding state in power panel is LCD TV
Electricity.
With being continuously increased of LCD TV function, a lot of LCD TVs all support plug-in usb load, are normal work shape
The power supply of the mainboard of the LCD TV under state and power speakers is also plug-in usb load supplying simultaneously.When in LCD TV
Standby mcu when remote control standby modulating signal is detected, if LCD TV is being plug-in usb load supplying, then standby
Mcu can close the output of mainboard, and closes the output of the partial circuit in the main circuit of power panel, for liquid crystal electricity such as in power panel
Depending in the output of circuit powered of LED lamp bar part, and be left the output of the circuit of plug-in usb load supplying, but now,
The power of LCD TV generally will not less than 0.5w that is to say, that although, LCD TV have received standby signal, but liquid crystal
TV is not introduced into holding state, now, if plug-in usb load is no longer necessary to power, for example, pulls out load, or negative
Carry charging complete, then, it is that the circuit of plug-in usb load supplying is also not turn off in the main circuit of power panel, in this circuit
Device still can power consumption so that the power of LCD TV can not be little as far as possible.
In sum, when receiving standby signal, if display device is also being powered for external load, then display sets
It is not turn off for the circuit that external load is powered in the main circuit of standby power panel, and after external load is no longer necessary to power supply,
This partial circuit can not be closed, and this can lead to display device can not enter into holding state.
Content of the invention
Embodiments provide a kind of display device and realize standby circuit, method, device and LCD TV, in order to
Solve existing display device when receiving standby signal, if also powered for external load, then the electricity of display device
It is not turn off for the circuit that external load is powered in the main circuit of source plate, and after external load is no longer necessary to power supply, this portion
Parallel circuit can not be closed, and this can lead to display device can not enter into the problem of holding state.
Based on the problems referred to above, standby circuit realized by a kind of display device provided in an embodiment of the present invention, defeated including voltage
Go out circuit, the first comparison circuit and setting circuit；
Described voltage follower circuit, for believing to the first comparison circuit output voltage according to the electric current of the first power supply output
Number；Described first power supply be display device the main circuit of power panel in for this display device under normal operating conditions mainboard
And the circuit that the external load of this display device is powered；Described voltage signal is proportional to the electric current of described first power supply output；
Described first comparison circuit, for the voltage that will receive from described voltage follower circuit, with setting circuit setting
The first predeterminated voltage be compared；And when the voltage receiving from described voltage follower circuit is less than the first predeterminated voltage,
Indicate that described mainboard closes described first power supply, and indicate that described mainboard is powered using second source, thus realizing described display
Equipment standby；Described second source be display device power panel in for this display device under holding state main board power supply
Circuit；Described first predeterminated voltage needs the electricity of electric current when powering and described voltage follower circuit less than described external load
Resistance is long-pending, with the resistance of described voltage follower circuit more than the electric current of described second source output long-pending.
Standby method realized by a kind of display device provided in an embodiment of the present invention, comprising:
Determine that electric current that voltage follower circuit exports according to the first power supply, to the first comparison circuit output voltage signal, is less than
Setting circuit setting the first predeterminated voltage, described first power supply be display device the main circuit of power panel in be normal work
The circuit that the external load of the mainboard of this display device under state and this display device is powered；Described voltage signal is proportional to
The electric current of described first power supply output；Described first predeterminated voltage less than described external load need power when electric current with described
The resistance of voltage follower circuit is long-pending, with the resistance of described voltage follower circuit more than the electric current of second source output long-pending；Institute
State the circuit for the main board power supply of this display device under holding state in the power panel that second source is display device；
Control described mainboard to close described first power supply, and control described mainboard to power using described second source, thus
Realize the standby of described display device.
Standby device realized by a kind of display device provided in an embodiment of the present invention, comprising:
Determining module, for determining that voltage follower circuit exports to the first comparison circuit according to the electric current that the first power supply exports
Voltage signal is less than the first predeterminated voltage of setting circuit setting, and described first power supply is the main circuit of the power panel of display device
In the circuit powered for the mainboard of this display device under normal operating conditions and the external load of this display device；Described electricity
Pressure signal is proportional to the electric current of described first power supply output；When described first predeterminated voltage needs power supply less than described external load
Electric current and described voltage follower circuit resistance long-pending, more than electric current and the described voltage follower circuit of second source output
Resistance is long-pending；Described second source be display device power panel in for this display device under holding state main board power supply
Circuit；
Control module, for controlling described mainboard to close described first power supply, and it is described to control described mainboard to adopt
Second source is powered, thus realizing the standby of described display device.
LCD TV provided in an embodiment of the present invention, realizes standby electricity including display device provided in an embodiment of the present invention
Road.
The beneficial effect of the embodiment of the present invention includes:
A kind of display device provided in an embodiment of the present invention realizes standby circuit, method, device and LCD TV, aobvious
When showing that equipment receives standby signal, it is display part in the output of mainboard of closing display device and the power panel of display device
Divide the circuit of power supply, if display device is also being powered for external load, then the electric current of the first power supply output and voltage output
Long-pending first predeterminated voltage being greater than setting circuit setting of resistance of circuit, therefore, in the power panel of this display device be
The circuit that external load is powered is not turn off, and wherein, the first power supply is in the main circuit of the power panel of this display device to be normal
The circuit that the external load of the mainboard of this display device under working condition and this display device is powered, the first predeterminated voltage is little
Need electric current when powering with the resistance of described voltage follower circuit long-pending in external load；And be no longer necessary to supply in external load
Electricity after, for example, pull out load or charging complete after, due to first power supply output electric current be decreased under holding state this show
Show the electric current needed for the mainboard of equipment, i.e. the electric current of second source output, this electric current is long-pending little with the resistance of voltage follower circuit
In the first predeterminated voltage, therefore, the first comparison circuit indicates that the mainboard of this display device closes the first power supply, and indicates this mainboard
Powered using second source, wherein, second source be this display device power panel in for this display device under holding state
Main board power supply circuit so that in the power panel of display device main circuit output completely close, realize this display and set
Standby is standby.
Brief description
Fig. 1 is that one of standby schematic diagram of circuit realized by display device provided in an embodiment of the present invention；
Fig. 2 is the two of the schematic diagram that standby circuit realized by display device provided in an embodiment of the present invention；
Fig. 3 is the three of the schematic diagram that standby circuit realized by display device provided in an embodiment of the present invention；
Fig. 4 is that one of standby flow chart of method realized by display device provided in an embodiment of the present invention；
Fig. 5 is the two of the flow chart that standby method realized by display device provided in an embodiment of the present invention；
Fig. 6 is the three of the flow chart that standby method realized by display device provided in an embodiment of the present invention；
Fig. 7 is the flow chart that display device provided in an embodiment of the present invention realizes when standby method is applied in practice；
Fig. 8 is the structure chart that standby device realized by display device provided in an embodiment of the present invention.
Specific embodiment
A kind of display device provided in an embodiment of the present invention realizes standby circuit, method, device and LCD TV,
When the electric current of one power supply output is less than the first predeterminated voltage with the long-pending of the resistance of voltage follower circuit, the mainboard of instruction display device
Close described first power supply, and indicate that this mainboard is powered using second source, thus realizing the standby of described display device, its
In, the first power supply be the power panel of display device main circuit in for the mainboard of this display device under normal operating conditions and
The circuit that the external load of this display device is powered；Second source be display device power panel in show for this under holding state
Show the circuit of the main board power supply of equipment；The external load that first predeterminated voltage is less than display device needs electric current when powering and electricity
The resistance of voltage follower circuit is long-pending, with the resistance of voltage follower circuit more than the electric current of second source output long-pending.
With reference to Figure of description, standby circuit, side are realized to a kind of display device provided in an embodiment of the present invention
The specific embodiment of method, device and LCD TV illustrates.
Standby circuit realized by display device provided in an embodiment of the present invention, as shown in figure 1, including voltage follower circuit
11st, the first comparison circuit 13 and setting circuit 12；
Voltage follower circuit 11, for believing to the first comparison circuit 13 output voltage according to the electric current of the first power supply output
Number；First power supply be the power panel of display device main circuit in for the mainboard of this display device under normal operating conditions and
The circuit that the external load of this display device is powered；The voltage signal of voltage follower circuit 11 output is proportional to the first power supply output
Electric current；
First comparison circuit 13, for the voltage that will receive from voltage follower circuit 11, with setting circuit 12 setting
First predeterminated voltage is compared；And when the voltage receiving from voltage follower circuit 11 is less than the first predeterminated voltage, instruction
This mainboard closes the first power supply, and indicates that this mainboard is powered using second source, thus realizing the standby of this display device；Its
In, second source be this display device power panel in for the main board power supply of this display device under holding state circuit, the
The external load that one predeterminated voltage is less than display device needs electric current when powering with the resistance of voltage follower circuit 11 long-pending, greatly
With the resistance of voltage follower circuit 11 long-pending in the electric current of second source output.
After display device receives standby signal, if display device is also being powered for external load, then display sets
It is that the circuit that the display portion in display device is powered is closed in the main circuit of standby power panel, the display also to be of the first power supply sets
Standby external load is powered, and therefore, the first power supply is not turn off, and because the mainboard output of display device is closed, therefore, first
The electric current of power supply output can reduce, after the external load of display device is no longer necessary to power supply, the electric current meeting of the first power supply output
Reduce further so that the voltage of voltage follower circuit output is less than the first predeterminated voltage, using provided in an embodiment of the present invention
Standby circuit realized by display device, can indicate that the mainboard of display device closes the first power supply, and indicate that this mainboard adopts second
Power supply is powered so that display device enters holding state, and external load can be the load being articulated in usb interface.
It is preferred that the first predeterminated voltage be less than display device mainboard in normal operating conditions the electric current needed for this mainboard
With the resistance of voltage follower circuit long-pending.If display device is in normal operating conditions, the first power supply needs normal for being in
The main board power supply in display device under working condition, so that the signal resolution receiving can be image and companion by this mainboard
Sound, is less than electric current and the voltage needed for mainboard this mainboard in normal operating conditions of this display device due to the first predeterminated voltage
The resistance of output circuit is long-pending, and therefore, even if external load does not need to power, voltage follower circuit exports according to the first power supply
If the voltage that electric current exports to the first comparison circuit also will not be less than the first predeterminated voltage that is to say, that display device be in
Working condition, even if external load does not need to power, realizes standby method using display device provided in an embodiment of the present invention,
Also it is not turn off the first power supply, display device will not be made to enter holding state.
Further, the first comparison circuit 13, is additionally operable to: is less than first in the voltage receiving from voltage follower circuit 11
During predeterminated voltage, if the output of the mainboard of display device is not turned off it indicates that this mainboard closes the output of itself, if display device
The output of the main circuit of power panel be not turned off, then close the output of this main circuit, and control the mainboard of display device to adopt
Two power supplys are powered；First predeterminated voltage be less than display device mainboard in normal operating conditions the electric current needed for this mainboard with electricity
The resistance of voltage follower circuit 11 is long-pending.
In display device just operationally, it is the main board power supply of display device and electricity that the external load of display device is powered
The electric current of source output reduces it is also possible to due to the mainboard fault of display device itself, as cannot be by the signal resolution receiving
For picture-and-sound, now, the mainboard of display device also can control power panel to light the screen of display device, and adopts the present invention
After standby circuit realized by the display device that embodiment provides, can reduce so that power supply is defeated in the electric current of the first power supply output
Go out circuit output voltage signal be decreased to less than the first predeterminated voltage (in the case that this display device does not have external load) after,
If the mainboard output of display device is not turned off it indicates that this mainboard closes the output of itself, if the power panel of display device
The output of main circuit is not turned off it indicates that mainboard closes the output of the main circuit of this power panel, and indicates that this mainboard adopts second
Power supply is powered, that is, be that the display portion of display device is powered in the main circuit of the power panel closing the first power supply and display device
Circuit, and close the output of the mainboard of display device so that display device automatically switches to holding state.That is, adopting
Standby circuit realized by display device provided in an embodiment of the present invention, can be in the case of display device main board failure, automatically
Display device is switched to holding state.
Further, the first comparison circuit 13 is additionally operable to: is not less than the in the voltage receiving from voltage follower circuit 11
During one predeterminated voltage, the mainboard of instruction display device does not change itself the main circuit output with the power panel of this display device；The
One predeterminated voltage be less than this display device mainboard in normal operating conditions the electric current needed for this mainboard and voltage follower circuit
11 resistance is long-pending.
Further, standby circuit realized by display device provided in an embodiment of the present invention, as shown in Fig. 2 also including steady
Volt circuit, this mu balanced circuit includes the second comparison circuit 21, transmission circuit 22, control circuit 23 and the first power supply 24；
Second comparison circuit 21, for determining the difference of monitoring voltage and described first predeterminated voltage, and exports to transmission electricity
Road 22, monitoring voltage is proportional to the electricity of the power supply output powered for the mainboard of display device and the external load of display device
Pressure；
Transmission circuit 22 is for determining the difference of the voltage difference of the second predeterminated voltage and the second comparison circuit 21 determination and defeated
Go out to control circuit 23；
Control circuit 23, when the voltage difference for exporting in transmission circuit 22 is less than the second predeterminated voltage, controls the first electricity
Source 24 increases the voltage of output signal, and when the voltage difference of transmission circuit 22 output is more than the second predeterminated voltage, controls first
Power supply 24 reduces the voltage of output signal, and when the voltage difference of transmission circuit 22 output is equal to the second predeterminated voltage, controls
First power supply 24 does not change the voltage of output signal.
Display device provided in an embodiment of the present invention is realized standby circuit and can be adopted the connected mode shown in Fig. 3,
In Fig. 3, the first power supply includes the first transformer t1, the first diode d1, the first inductance l1, the 3rd electric capacity c3 and the 4th electric capacity
c4；The DC voltage receiving is converted to power supply signal under the control of control circuit 23 by the first power supply, i.e. the letter of power point
Number, power supply signal is the mainboard of display device and the external load of display device is powered.In figure 3, setting circuit includes the 5th
Resistance r5 and the first adjustable Zener diode n1, the 5th resistance r5 is biasing resistor, provides to the first adjustable Zener diode n1
One stable bias current, first adjustable Zener diode n1 one stable reference voltage of output, i.e. the voltage of ref point,
The voltage of ref point is the first predeterminated voltage.Voltage follower circuit can be the resistance unit or of a series and parallel
Individual resistance, in figure 3, voltage follower circuit is first resistor r1, the electricity of one end that first resistor r1 is connected with the 3rd electric capacity c3
Pressure, the voltage signal that is, voltage follower circuit exports as the first comparison circuit, the voltage of out point is negative for reference ground
Pressure.
In figure 3, the first comparison circuit includes the first operational amplifier a1, second resistance r2,3rd resistor r3, the 4th electricity
Resistance r4 and the first electric capacity c1, when the electric current of power point is less, that is, needed for the mainboard of display device and the external load of display device
Electric current less, lead to the voltage of out point to be less than the voltage of ref point divided by 3rd resistor r3 divided by the resistance of second resistance r2
During resistance, the voltage of the inverting input of the first operational amplifier a1 is just, the first operational amplifier a1 output low level signal,
This low level signal indicates that the mainboard of display device closes the first power supply, and indicates that this mainboard is powered using second source, thus
Realize the standby of this display device；If now, the output of this mainboard is also not turned off, then also need to close the output of mainboard；
When the electric current of power point is larger, that is, the mainboard of display device and the electric current needed for the external load of display device are larger, lead to
The voltage of out point divided by second resistance r2 resistance be more than ref point voltage divided by 3rd resistor r3 resistance when, the first computing
The voltage of the inverting input of amplifier a1 is negative, the first operational amplifier a1 output high level signal, and this high level signal refers to
Show that the mainboard of display device does not change the output of the main circuit of the output of itself and the power panel of display device.Wherein, the 4th
Resistance r4 is relevant with the ratio of adjustment feedback, and the 4th resistance r4 is bigger, and adjustment ratio is bigger, and the first electric capacity c1 is less, feedback speed
Degree is faster.
The first comparison circuit in Fig. 3 employs the form of adder, in practice, first comparator can also using than
Compared with device, electric current can also directly be compared using Hall switch.
In figure 3, transmission circuit includes photo-coupler n2 and the tenth resistance r10.In figure 3, the second comparison circuit includes
Second operational amplifier a2, the 6th resistance r6, the 7th resistance r7, the 8th resistance r8, the 9th resistance r9 and the second electric capacity c2；When
The voltage of one power supply output reduces, and leads to monitoring voltage, when that is, the voltage of sense point reduces, the second operational amplifier a2 output
Voltage reduce so that flow through the light emitting diode in photo-coupler n2 electric current reduce, lead to flow through in photo-coupler n2
The electric current of phototriode reduces, and therefore, the voltage on the phototriode in photo-coupler n2 reduces, and feeds back to control circuit
Feedback voltage, i.e. the voltage of fb point, the voltage of fb point is equal to and drives the voltage vcc of the phototriode in photo-coupler n2 to subtract
Remove the voltage on the phototriode in photo-coupler n2, therefore, voltage increase, the voltage of fb point and the control circuit 23 of fb point
The difference of the second internal predeterminated voltage increases, and the dutycycle of the control signal of control circuit 23 output can increase, thus controlling the
The voltage of one power supply output increases.When the voltage of the first power supply output increases, lead to monitoring voltage, that is, the voltage of sense point increases
When big, the voltage of the second operational amplifier a2 output increases so that the electric current flowing through the light emitting diode in photo-coupler n2 increases
Greatly, the electric current flowing through the phototriode in photo-coupler n2 is led to increase, therefore, on the phototriode in photo-coupler n2
Voltage increase, feed back to the feedback voltage of control circuit, that is, the voltage of fb point be equal to drive photo-coupler n2 in photosensitive three
The voltage vcc of pole pipe deducts the voltage on the phototriode in photo-coupler n2, and therefore, the voltage of fb point reduces, fb point
Voltage is little with the subtractive of the second predeterminated voltage within control circuit 23, and the dutycycle of the control signal of control circuit output can subtract
Little, thus controlling the voltage of the first power supply output to reduce.
The second comparison circuit 21 in Fig. 2, transmission circuit 22 and control circuit 23 can together with control the first power supply output
Burning voltage, this can substitute the mu balanced circuit using adjustable Zener diode in existing LCD TV, due to usual one
Two operational amplifiers can be comprised in individual IC chip, therefore, using the mu balanced circuit shown in Fig. 3, device can be saved
And design space.
Standby method realized by a kind of display device provided in an embodiment of the present invention is with provided in an embodiment of the present invention aobvious
Based on showing that equipment realizes standby circuit, as shown in figure 4, the method specifically includes following steps:
S401, determine that voltage follower circuit is believed to the first comparison circuit output voltage according to the electric current that the first power supply exports
Number, less than the first predeterminated voltage of setting circuit setting, wherein, the first power supply is to be in the main circuit of the power panel of display device
The circuit that the external load of the mainboard of this display device under normal operating conditions and this display device is powered；Voltage output electricity
The voltage signal of road output is proportional to the electric current of the first power supply output；First predeterminated voltage is less than the external load of this display device
Need electric current when powering with the resistance of voltage follower circuit long-pending, more than electric current and the voltage follower circuit of second source output
Resistance long-pending；Second source be display device power panel in for the main board power supply of this display device under holding state electricity
Road；
S402, control the mainboard of this display device to close the first power supply, and control this mainboard to power using second source, from
And realize the standby of this display device.
When display device receives standby signal, the mainboard of display device can close itself output and display device
Power panel in the circuit powered for display portion, if display device is also being powered for external load, then the first power supply is not
Can close, because display device is also being powered, therefore, the electric current of the first power supply output and voltage follower circuit for external load
Long-pending the first predeterminated voltage being greater than setting circuit setting of resistance, therefore, mainboard is not turn off the first power supply, wherein, the
One power supply be the power panel of this display device main circuit in for the mainboard of this display device under normal operating conditions and should
The circuit that the external load of display device is powered, the first predeterminated voltage needs electric current when powering and described electricity less than external load
The resistance of voltage follower circuit is long-pending；And after external load is no longer necessary to power supply, for example, after pulling out load or charging complete,
Because the electric current of the first power supply output is decreased to the electric current needed for the mainboard of this display device under holding state, i.e. second source
The electric current of output, this electric current is less than the first predeterminated voltage with the long-pending of the resistance of voltage follower circuit, therefore, is implemented using the present invention
The display device that example provides realizes standby method and control mainboard can cut out the first power supply, and is powered for it using second source,
Wherein, second source be this display device power panel in for the main board power supply of this display device under holding state circuit,
So that the main circuit output in the power panel of display device completely closes, realize the standby of this display device.
Further, standby method realized by a kind of display device provided in an embodiment of the present invention, as shown in figure 5, also wrapping
Include:
S501, determine that voltage follower circuit is believed to the first comparison circuit output voltage according to the electric current that the first power supply exports
Number, less than the first predeterminated voltage of setting circuit setting, wherein, the external load that the first predeterminated voltage is less than this display device needs
The resistance of electric current when to be powered and voltage follower circuit is long-pending, less than display device mainboard in normal operating conditions this master
Electric current needed for plate is with the resistance of voltage follower circuit long-pending, more than the electric current of second source output and the electricity of voltage follower circuit
Resistance is long-pending；
S502, when the output of the mainboard of display device is not turned off, close the output of this mainboard, if the power supply of display device
The output of the main circuit of plate is not turned off, then the output of this main circuit, and controls this mainboard to power using second source, thus realizing
This display device standby.
In display device just operationally, it is the main board power supply of display device and electricity that the external load of display device is powered
Source, that is, the electric current reduction of the first power supply output is it is also possible to due to the mainboard fault of display device itself, such as cannot will receive
Signal resolution be picture-and-sound, now, the mainboard of display device also can control power panel to light the screen of display device, and
Realize after standby method using display device provided in an embodiment of the present invention, can reduce in the electric current of the first power supply output,
(this display device does not have external load to make the voltage signal that power output circuit exports be decreased to less than the first predeterminated voltage
In the case of) after, if the mainboard output of display device is not turned off, close the output of this mainboard, if the power panel of display device
The output of main circuit be not turned off, then close the output of the main circuit of this power panel, and control this mainboard to adopt second source to supply
Electricity, that is, be the circuit that the display portion of display device is powered in the main circuit of the power panel closing the first power supply and display device,
And close the output of the mainboard of display device so that display device automatically switches to holding state.That is, adopting the present invention
Standby method realized by the display device that embodiment provides, and automatically will be able to show in the case of display device main board failure
Equipment switches to holding state.
Further, standby method realized by display device provided in an embodiment of the present invention, as shown in fig. 6, also including:
S601, determine that voltage follower circuit is believed to the first comparison circuit output voltage according to the electric current that the first power supply exports
Number, not less than the first predeterminated voltage of setting circuit setting, wherein, the first predeterminated voltage is less than the external load of this display device
Need electric current when powering with the resistance of voltage follower circuit long-pending, should in normal operating conditions less than the mainboard of display device
Electric current needed for mainboard is with the resistance of voltage follower circuit long-pending, more than electric current and the voltage follower circuit of second source output
Resistance is long-pending；
S602, do not change the main circuit of power panel of display device and the output of the mainboard of this display device.
When the electric current of the first power supply output is not less than the first predeterminated voltage with the long-pending of the resistance of voltage follower circuit, if
Display device receives standby signal, and display device is also being powered for external load, then, until external load does not need to supply
Electricity, display device just can be switched to holding state；If display device is in normal operating conditions, then display device normally shows
Show.
Realize standby method to further illustrate display device provided in an embodiment of the present invention, in this way should below
With illustrating as a example process in practice.Display device provided in an embodiment of the present invention is realized standby method and is applied in reality
Flow process in border as shown in fig. 7, comprises:
S701, judge that voltage follower circuit according to the voltage signal that the electric current that the first power supply exports exports to comparison circuit is
No be less than the first predeterminated voltage, if so, execute s702, otherwise, execute s703；
In practice, the mainboard of display device is in required electric current during holding state, and that is, second source output current is little
The electric current when external load of display device needs power supply, the external load of display device needs electric current when powering less than aobvious
Show that the mainboard of equipment is in required electric current during normal operating conditions.Therefore, the first predeterminated voltage is less than the external of display device
Load needs electric current when powering with the resistance of voltage follower circuit long-pending, more than electric current and the voltage output of second source output
The resistance of circuit is long-pending.
If the main circuit in the power panel of s702 display device is not turned off, control the main electricity of the power panel of display device
Road is closed, and when the output of the mainboard of display device is not turned off, closes the output of this mainboard, and controls this mainboard to adopt the
Two power supplys are powered；
S703, do not change the main circuit of power panel of display device and the output of the mainboard of this display device.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of display device and realizes standby device, due to
The principle of this device institute solve problem realizes to aforementioned display device that standby method is similar, and the therefore enforcement of this device can be joined
See the enforcement of preceding method, repeat no more in place of repetition.
Standby device realized by display device provided in an embodiment of the present invention, as shown in Figure 8, comprising:
Determining module 81, defeated to the first comparison circuit for determining the electric current that voltage follower circuit exports according to the first power supply
Go out the first predeterminated voltage that voltage signal is less than setting circuit setting, wherein, the first power supply is the master of the power panel of display device
It is the mainboard of this display device under normal operating conditions and the circuit powered of the external load of this display device in circuit；Electricity
The voltage signal of voltage follower circuit output is proportional to the electric current of the first power supply output；First predeterminated voltage is less than the outer of display device
Connecing load needs electric current when powering with the resistance of voltage follower circuit long-pending, defeated with voltage more than the electric current of second source output
The resistance going out circuit is long-pending；Second source be display device power panel in supply for the mainboard of this display device under holding state
The circuit of electricity；
Control module 82, the mainboard for controlling display device closes the first power supply, and controls this mainboard to adopt the second electricity
Source powers, thus realizing the standby of display device.
Further, control module 82 is additionally operable to: the first predeterminated voltage is less than the mainboard of display device in normal work shape
During state, the electric current needed for this mainboard is with the resistance of voltage follower circuit long-pending, is determining that voltage follower circuit is defeated according to the first power supply
After the electric current going out is less than the first predeterminated voltage to the first comparison circuit output voltage signal, if the output of this mainboard is not turned off,
Then close the output of this mainboard, if the output of the main circuit of the power panel of display device is not turned off, close the defeated of this main circuit
Go out, and control the mainboard of display device to power using second source.
Further, it is determined that module 81 is additionally operable to: determine electric current that voltage follower circuit exports according to the first power supply to
One comparison circuit output voltage signal is not less than described first predeterminated voltage, and the first predeterminated voltage is less than the master of described display device
Plate electric current needed for this mainboard in normal operating conditions is with the resistance of described voltage follower circuit long-pending；
Control module 82 is additionally operable to: does not change the main circuit output of power panel and the output of this mainboard of display device.
A kind of LCD TV provided in an embodiment of the present invention include display device provided in an embodiment of the present invention realize standby
Circuit.
Through the above description of the embodiments, those skilled in the art can be understood that the embodiment of the present invention
Can be realized by hardware it is also possible to realize by by way of software plus necessary general hardware platform.Based on such reason
Solution, the technical scheme of the embodiment of the present invention can be embodied in the form of software product, and this software product can be stored in one
In individual non-volatile memory medium (can be cd-rom, u disk, portable hard drive etc.), including some instructions with so that a meter
Calculate machine equipment (can be personal computer, server, or network equipment etc.) and execute the side described in each embodiment of the present invention
Method.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or stream
Journey is not necessarily implemented necessary to the present invention.
It will be appreciated by those skilled in the art that module in device in embodiment can be carried out point according to embodiment description
It is distributed in the device of embodiment and be disposed other than in one or more devices of the present embodiment it is also possible to carry out respective change.On
The module stating embodiment can merge into a module it is also possible to be further split into multiple submodule.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
Obviously, those skilled in the art can carry out the various changes and modification essence without deviating from the present invention to the present invention
God and scope.So, if these modifications of the present invention and modification belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprise these changes and modification.
Claims (11)
1. a kind of display device realizes standby circuit it is characterised in that including voltage follower circuit, the first comparison circuit and setting
Circuits；
Described voltage follower circuit, for according to first power supply output electric current to the first comparison circuit output voltage signal；Institute
State in the main circuit of the power panel that the first power supply is display device be normal operating conditions under the mainboard of this display device and
The circuit that the external load of this display device is powered；Described voltage signal is proportional to the electric current of described first power supply output；
Described first comparison circuit, for the voltage that will receive from described voltage follower circuit, with setting circuit setting the
One predeterminated voltage is compared；And when the voltage receiving from described voltage follower circuit is less than the first predeterminated voltage, instruction
Described mainboard closes described first power supply, and indicates that described mainboard is powered using second source, thus realizing described display device
Standby；Described second source be display device power panel in for the main board power supply of this display device under holding state electricity
Road；Described first predeterminated voltage need less than described external load electric current and described voltage follower circuit when powering resistance it
Long-pending, with the resistance of described voltage follower circuit more than the electric current of described second source output long-pending.
2. circuit as claimed in claim 1 is it is characterised in that described first comparison circuit is additionally operable to: from voltage output electricity
When the voltage that road receives is less than the first predeterminated voltage, if the output of described mainboard is not turned off it indicates that described mainboard is closed certainly
The output of body, if the output of the main circuit of the power panel of display device is not turned off, closes the output of this main circuit, and controls aobvious
Show that the mainboard of equipment is powered using second source；Described first predeterminated voltage is less than the mainboard of described display device in normal work
During state, the electric current needed for described mainboard is with the resistance of described voltage follower circuit long-pending.
3. circuit as claimed in claim 1 is it is characterised in that described first comparison circuit is additionally operable to:
The voltage receiving from voltage follower circuit be not less than the first predeterminated voltage when, indicate described mainboard do not change itself and
The main circuit output of the power panel of display device；Described first predeterminated voltage is less than the mainboard of described display device in normal work
During state, the electric current needed for described mainboard is with the resistance of described voltage follower circuit long-pending.
4. it is characterised in that also including mu balanced circuit, described mu balanced circuit includes the second ratio to circuit as claimed in claim 1
Compared with circuit, transmission circuit, control circuit and the first power supply；
Described second comparison circuit, for determining the difference of monitoring voltage and described first predeterminated voltage, and exports to described transmission
Circuit, described monitoring voltage is proportional to the voltage of described power supply output；
Described transmission circuit is for determining the difference of the second predeterminated voltage and the voltage difference of described second comparison circuit determination and defeated
Go out to control circuit；
Described control circuit, when the voltage difference for exporting in described transmission circuit is less than the second predeterminated voltage, controls the first electricity
Source increases the voltage of output signal, and when the voltage difference of described transmission circuit output is more than the second predeterminated voltage, controls first
Power supply reduces the voltage of output signal, and when the voltage difference of described transmission circuit output is equal to the second predeterminated voltage, controls
First power supply does not change the voltage of output signal.
5. a kind of display device realizes standby method it is characterised in that including:
Determine electric current that voltage follower circuit exports according to the first power supply to the first comparison circuit output voltage signal, less than setting
Circuit setting the first predeterminated voltage, described first power supply be display device the main circuit of power panel in be normal operating conditions
Under the mainboard of this display device and the circuit powered of the external load of this display device；Described voltage signal is proportional to described
The electric current of the first power supply output；Described first predeterminated voltage needs electric current when powering and described voltage less than described external load
The resistance of output circuit is long-pending, with the resistance of described voltage follower circuit more than the electric current of second source output long-pending；Described
Two power supplys be display device power panel in for the main board power supply of this display device under holding state circuit；
Control described mainboard to close described first power supply, and control described mainboard to power using described second source, thus realizing
Described display device standby.
6. method as claimed in claim 5 is it is characterised in that described first predeterminated voltage is less than the mainboard of described display device
In normal operating conditions, the electric current needed for described mainboard is with the resistance of described voltage follower circuit long-pending, is determining voltage output
After circuit is less than described first predeterminated voltage according to the electric current that the first power supply exports to the first comparison circuit output voltage signal,
Methods described also includes:
If the output of described mainboard is not turned off, close the output of described mainboard, if the main circuit of the power panel of display device
Output is not turned off, then close the output of this main circuit, and controls the mainboard of display device to power using second source.
7. method as claimed in claim 6 is it is characterised in that methods described also includes:
Determine that voltage follower circuit is not less than institute according to the electric current that the first power supply exports to the first comparison circuit output voltage signal
State the first predeterminated voltage；Described first predeterminated voltage be less than described display device mainboard in normal operating conditions described mainboard
Required electric current is with the resistance of described voltage follower circuit long-pending；
Do not change the main circuit of described power panel and the output of described mainboard.
8. a kind of display device realizes standby device it is characterised in that also including:
Determining module, for determining electric current that voltage follower circuit exports according to the first power supply to the first comparison circuit output voltage
Signal is less than the first predeterminated voltage of setting circuit setting, and described first power supply is to be in the main circuit of power panel of display device
The circuit that the external load of the mainboard of this display device under normal operating conditions and this display device is powered；Described voltage letter
Number it is proportional to the electric current of described first power supply output；Described first predeterminated voltage needs electricity when powering less than described external load
Stream is with the resistance of described voltage follower circuit long-pending, more than the electric current of second source output and the resistance of described voltage follower circuit
Long-pending；Described second source be display device power panel in for the main board power supply of this display device under holding state electricity
Road；
Control module, for controlling described mainboard to close described first power supply, and controls described mainboard to adopt described second source
Power supply, thus realize the standby of described display device.
9. device as claimed in claim 8 is it is characterised in that described control module is additionally operable to:
Described first predeterminated voltage be less than described display device mainboard in normal operating conditions the electric current needed for described mainboard
With the resistance of described voltage follower circuit long-pending, compared to first according to the electric current that the first power supply exports in determination voltage follower circuit
After being less than described first predeterminated voltage compared with circuit output voltage signal, if the output of described mainboard is not turned off, close described
The output of mainboard, if the output of the main circuit of the power panel of display device is not turned off, closes the output of this main circuit, and controls
The mainboard of display device is powered using second source.
10. device as claimed in claim 8 is it is characterised in that described determining module is additionally operable to:
Determine that voltage follower circuit is not little to the first comparison circuit output voltage signal according to the electric current of described first power supply output
In described first predeterminated voltage, described first predeterminated voltage is less than the mainboard of described display device described in normal operating conditions
Electric current needed for mainboard is with the resistance of described voltage follower circuit long-pending；
Described control module is additionally operable to:
Do not change the main circuit of described power panel and the output of described mainboard.
A kind of 11. LCD TVs it is characterised in that the display device that includes as described in any one of claim 1-4 realize standby
Circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410004800.0A CN103780854B (en) | 2014-01-06 | 2014-01-06 | Display device standby realizing method, device and circuit and liquid crystal television |
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| CN201410004800.0A CN103780854B (en) | 2014-01-06 | 2014-01-06 | Display device standby realizing method, device and circuit and liquid crystal television |
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| CN103780854B true CN103780854B (en) | 2017-01-25 |
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| US6316844B1 (en) * | 1999-05-27 | 2001-11-13 | Lg Electronics, Inc. | Power supply for consuming lower power in a standby mode |
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| CN103780854A (en) | 2014-05-07 |
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Address after: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee after: Hisense Visual Technology Co., Ltd. Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |
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