CN104680986B - A kind of backlight module, liquid crystal display and display device - Google Patents
A kind of backlight module, liquid crystal display and display device Download PDFInfo
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Abstract
The invention discloses a kind of backlight module, liquid crystal display and display device, backlight module includes multichannel luminescent device group and feedback control unit；When feedback control unit is detected at least the sampled voltage of luminescent device group exceedes preset value all the way when, illustrate to have luminescent device group to be short-circuited phenomenon, so as to control all luminescent device groups to close.Therefore the backlight module in time can be closed all luminescent device groups when luminescent device group is short-circuited using feedback control unit, so as to avoid circuit burnout etc. caused by luminescent device group is short-circuited from losing.
Description
Technical field
The present invention relates to display technology field, espespecially a kind of backlight module, liquid crystal display and display device.
Background technology
Liquid crystal display is a kind of passive luminescent device, and itself does not light, it is necessary to which backlight module provides light source
Make its display image to liquid crystal panel.Because backlight module uses the characteristics of having frivolous and power saving on liquid crystal panel, therefore
It is widely used in display device.But, backlight module traditional at present typically can not all be done when backlight is short-circuited
Go out response, so as to cause the drive circuit in backlight module to be easy to be damaged, or even burn backlight.
The content of the invention
The embodiment of the present invention provides a kind of backlight module, liquid crystal display and display device, to avoid in the prior art
The loss caused when backlight is short-circuited existed.
A kind of backlight module provided in an embodiment of the present invention includes multichannel luminescent device group, feedback control unit；
The feedback control unit, when detecting at least, the sampled voltage of the luminescent device group exceedes preset value all the way
When, control all luminescent device groups to close.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, the feedback control unit is specifically included：
Feed back subelement and drive control subelement；Wherein,
The feedback subelement, the sampled voltage for detecting luminescent device group described in each road, when at least hair all the way
When the sampled voltage of optical device group exceedes preset value, output feedback ontrol signal；
The drive control subelement, controls all luminescent device groups to close according to the feedback control signal.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, the drive control subelement is additionally operable to, root
The unlatching of luminescent device group described in each road is controlled according to pulse width modulating signal.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, the drive control subelement, specific bag
Include：Signal output module, signal modulation module and drive module；Wherein,
The signal output module, for being exported and a pair of luminescent device group 1 described in each road to the signal modulation module
The pulse width modulating signal answered；
The signal modulation module, for when only receiving the pulse width modulating signal, according to each pulse
Bandwidth modulation signals control drive module driving luminescent device group unlatching corresponding with each pulse width modulating signal；
When receiving the feedback control signal of the feedback subelement output, the drive module is controlled to control all luminescent device groups
Close.
In a kind of possible embodiment, in above-mentioned backlight module provided in an embodiment of the present invention, the driving mould
Block, is specifically included：Submodule is driven correspondingly respectively with luminescent device group described in each road；Wherein,
Each driving submodule includes：The switch controller and first resistor connected with corresponding luminescent device group, are used
In the luminous voltage source that voltage is provided to the luminescent device group and the first resistor, and positioned at the luminescent device group with
Between the first resistor and for the feedback signal for the use voltage that the luminescent device group is fed back to the feedback subelement
End；Wherein, the sampled voltage is the voltage of the first resistor, the control end of the switch controller and the signal modulation
Module is connected, under the control of the signal modulation module, controlling being turned on and off for the luminescent device group.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, the feedback subelement, specifically for：
Detect the sampled voltage that the feedback signal terminal of each driving submodule is fed back；By the sampled voltage of the feedback
It is compared with the preset reference voltage corresponding to corresponding feedback signal terminal；If the sampled voltage of at least one feedback
More than corresponding preset reference voltage, to the signal modulation module output feedback ontrol signal.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, the photophore in each luminescent device group
The quantity of part is identical, and each same luminous voltage source of luminescent device group correspondence.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, it is corresponding pre- with each feedback signal terminal
If reference voltage is equal.
In a kind of possible embodiment, in above-mentioned backlight module provided in an embodiment of the present invention, feedback
Unit, is specifically included：Voltage comparator, phase inverter and transistor；Wherein,
The voltage comparator have normal phase input end, an output end and with each driving submodule
Feedback signal terminal corresponds connected negative-phase input, and the normal phase input end is used to receive the preset reference voltage, institute
The input that output end is stated with the phase inverter is connected, the output end of the phase inverter and the base stage phase of the transistor
Even；When the voltage of at least one negative-phase input is more than the voltage of the normal phase input end, the voltage comparator
Output end pass through the phase inverter output control voltage；
The grounded emitter of the transistor, the colelctor electrode of the transistor and the signal modulation module phase
Even；The transistor is used for when obtaining the control voltage by phase inverter, by the colelctor electrode to the signal
Modulation module sends feedback control signal.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, the feedback subelement also includes：Crystal
Diode；Wherein,
The plus earth of the crystal diode, the output end phase of the negative pole of the crystal diode and the phase inverter
Even.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, the feedback subelement also includes：Second
Resistance and 3rd resistor；Wherein,
One end of the second resistance is connected with the output end of the phase inverter, the other end respectively with the crystal diode
Negative pole be connected with the base stage of the transistor；
The 3rd resistor is connected between the base stage of the transistor and emitter stage.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, the signal modulation module is specifically included：
With each one-to-one signal modulation submodule of luminescent device group；Wherein,
Each signal modulation submodule has the first signal input part, secondary signal input and drive signal output
End；First signal input part, for receive signal output module output with corresponding to corresponding luminescent device group
Pulse width modulating signal；The secondary signal input, the feedback control signal for receiving the feedback subelement output；
The signal modulation submodule, for and if only if, the first signal input part receives pulse width modulating signal
When, the first driving control signal is exported to the signal output part according to each pulse width modulating signal or the second driving is controlled
Signal processed；When secondary signal input receives feedback control signal, driven to drive signal output end output second
Control signal；
The drive module, drives for the drive signal output end output first in the corresponding signal modulation submodule
During dynamic control signal, corresponding luminescent device group is controlled to open；It is defeated in the drive signal of the corresponding signal modulation submodule
When going out end the second driving control signal of output, corresponding luminescent device group is controlled to close.
In a kind of possible embodiment, in above-mentioned backlight module provided in an embodiment of the present invention, signal modulation
Module, including：Photoisolator；The photoisolator includes：First input end, the second input, the first reference signal end,
Second reference signal end, output end, the 4th resistance, the 5th resistance, the 6th resistance and the first photophore, the second photophore and
Light-receiving device；Wherein,
The first input end of the photoisolator is the first signal input part of the signal modulation submodule, the light
Second input of electric isolator is the secondary signal input of the signal modulation submodule；The output of the photoisolator
Hold as the drive signal output end of the signal modulation submodule；
First photophore and the 4th resistant series are between first input end and the second reference signal end；
Second photophore and the 5th resistant series are between the first reference signal end and second input；It is described
One end of light-receiving device is connected by the 6th resistance with the first reference signal end, the other end of the light-receiving device with it is described
Second reference signal end is connected, and one end that the light-receiving device is connected with the 6th resistance is the output end of photoisolator；
When the first input end of the photoisolator receives pulse width modulating signal, the first photophore hair
Light does not light, when the second input of the photoisolator receives feedback control signal, the second photophore hair
Light；When first photophore and/or luminous second photophore, the two ends of the light-receiving device are in the conduction state, institute
The output end for stating photoisolator exports the second driving control signal, when first photophore and second photophore not
When luminous, the two ends of the light-receiving device are in cut-off state, and the output end of the photoisolator exports the first drive control letter
Number.
Correspondingly, the embodiment of the present invention additionally provides a kind of liquid crystal display, including provided in an embodiment of the present invention above-mentioned
Backlight module.
Correspondingly, the embodiment of the present invention additionally provides a kind of display device, including above-mentioned liquid provided in an embodiment of the present invention
Crystal display.
Above-mentioned backlight module provided in an embodiment of the present invention, liquid crystal display and display device, backlight module include multichannel
Luminescent device group and feedback control unit；When the sampled voltage that feedback control unit detects at least luminescent device group all the way surpasses
When crossing preset value, illustrate to have luminescent device group to be short-circuited phenomenon, so as to control all luminescent device groups to close.Therefore the back of the body
Optical mode group in time can be closed all luminescent device groups when luminescent device group is short-circuited using feedback control unit, from
And circuit burnout etc. caused by luminescent device group is short-circuited can be avoided to lose.
Brief description of the drawings
Fig. 1 is one of structural representation of backlight module provided in an embodiment of the present invention；
Fig. 2 is the two of the structural representation of backlight module provided in an embodiment of the present invention；
Fig. 3 is the three of the structural representation of backlight module provided in an embodiment of the present invention；
Fig. 4 is the four of the structural representation of backlight module provided in an embodiment of the present invention；
Fig. 5 is the five of the structural representation of backlight module provided in an embodiment of the present invention；
Fig. 6 is the six of the structural representation of backlight module provided in an embodiment of the present invention；
Fig. 7 is the seven of the structural representation of backlight module provided in an embodiment of the present invention；
Fig. 8 is the eight of the structural representation of backlight module provided in an embodiment of the present invention；
Fig. 9 is the nine of the structural representation of backlight module provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawings, to the specific of backlight module provided in an embodiment of the present invention, liquid crystal display and display device
Embodiment is described in detail.
A kind of backlight module provided in an embodiment of the present invention, as shown in figure 1, including：Multichannel luminescent device group 1, also includes：
The feedback control unit 2 being connected with each road luminescent device group 1；
Feedback control unit 2, the sampled voltage of each road luminescent device group 1 is flowed through for detecting, when detecting at least one
When the sampled voltage of road luminescent device group 1 exceedes preset value, all luminescent device groups 1 are controlled to close.
Above-mentioned backlight module provided in an embodiment of the present invention, including multichannel luminescent device Zu Heyuge roads luminescent device group connect
The feedback control unit connect, when feedback control unit is detected at least, the sampled voltage of luminescent device group exceedes preset value all the way
When, illustrate to have luminescent device group to be short-circuited phenomenon, so as to control all luminescent device groups to close.Therefore the backlight module is sharp
All luminescent device groups can be closed in time when luminescent device group is short-circuited with feedback control unit, so as to keep away
Exempt from circuit burnout etc. caused by luminescent device group is short-circuited to lose.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, as shown in Fig. 2 feedback control unit 2, tool
Body can include：Feed back subelement 21 and drive control subelement 22；Wherein,
Subelement 21 is fed back, the sampled voltage of each road luminescent device group 1 is flowed through for detecting, when at least photophore all the way
When the sampled voltage of part group 1 exceedes preset value, output feedback ontrol signal；
Drive control subelement 22, for receiving feedback control signal, and it is all luminous according to feedback control signal control
Device group 1 is closed.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, drive control subelement is additionally operable to, according to arteries and veins
Bandwidth modulation signals are rushed to control the unlatching of each road luminescent device group.In the specific implementation, it can be adjusted according to regulation pulse width
The dutycycle of signal processed controls the opening time of each luminescent device group, is not limited thereto.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, as shown in figure 3, drive control subelement 22,
It can specifically include：Signal output module 221, signal modulation module 222 and drive module 223；Wherein,
Signal output module 221, for exporting one-to-one with each road luminescent device group 1 to signal modulation module 222
Pulse width modulating signal PWM；
Signal modulation module 222, the pulse width modulating signal for ought only receive the output of signal output module 221
During PWM, control the driving of drive module 223 corresponding with each pulse width modulating signal PWM according to each pulse width modulating signal PWM
Luminescent device group 1 open；When receiving the feedback control signal that feedback subelement 21 is exported, control drive module 223 is controlled
All luminescent device groups 1 are made to close.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, as shown in figure 4, drive module 223, specifically
It can include：Submodule 2231 is driven correspondingly respectively with each road luminescent device group 1；Wherein,
Each driving submodule 2231 includes：The switch controller Q1 and first resistor connected with corresponding luminescent device group 1
R1, the luminous voltage source Vin for providing voltage to luminescent device group 1 and first resistor R1, and positioned at luminescent device group 1 with
Between first resistor R1 and for the feedback signal terminal Vr of the sampled voltage to the feedback feedback light emitting device group 1 of subelement 21；Its
In, sampled voltage is connected for first resistor R1 voltage switch controller Q1 control end with signal modulation module 222, for
Under the control of signal modulation module 222, being turned on and off for luminescent device group 1 is controlled.
Specifically, in the specific implementation, in above-mentioned backlight module provided in an embodiment of the present invention, in order to easy to make, one
As each driving submodule be located at the same side of each luminescent device group, and in each driving submodule, luminescent device group and first
The order of resistance is typically identical, is not limited thereto.
Further, it is each to drive in submodule in order to simple in construction in above-mentioned backlight module provided in an embodiment of the present invention
Luminous voltage source for providing voltage to luminescent device group and first resistor is generally same voltage source, thus can be each
Road luminescent device group is connected with same luminous voltage source.During specific implementation, can Shi Ge roads luminescent device group one end with it is same
Voltage source be connected, the other end of each road luminescent device group is grounded by first resistor, as long as ensure series connection luminescent device group and
The voltage at the two ends of first resistor is the voltage equal to luminous voltage source.
Further, in above-mentioned backlight module provided in an embodiment of the present invention, in order to ensure the hair of each luminescent device group
Brightness is identical, identical per the luminescent device quantity in the luminescent device group of road, is lighted so as to flow through every road when ensureing normal luminous
The electric current of device group is equal.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, switch controller can be switching transistor,
Can also be skilled person will appreciate that other structures, do not limit herein.
It the above is only the concrete structure for illustrating drive module in backlight module, in the specific implementation, drive module
Concrete structure is not limited to said structure provided in an embodiment of the present invention, can also be skilled person will appreciate that other knot
Structure, is not limited herein.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, as shown in figure 4, feedback subelement 21, specifically
For：
The sampled voltage of the feedback signal terminal Vr of each driving submodule 2231 of detection feedback；By the sampled voltage of feedback with
Preset reference voltage corresponding to corresponding feedback signal terminal Vr is compared；If the sampled voltage of at least one feedback is more than
Corresponding preset reference voltage, illustrates have luminescent device group 1 to occur exception, to the output feedback control of signal modulation module 222
Signal processed.
Specifically, in the specific implementation, in above-mentioned backlight module provided in an embodiment of the present invention, a luminescent device group
A preset reference voltage is corresponded to, and the size of preset reference voltage is normally sent out with corresponding feedback signal terminal in luminescent device group
The voltage of light time is relevant.Therefore, can be by each feedback signal terminal in order to which identical preset reference voltage can be used when implementing
There is the position of identical voltage when being located at each luminescent device group normal luminous.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, luminescent device in each luminescent device group
Quantity is identical, and the same luminous voltage source of each luminescent device group correspondence.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, default base corresponding with each feedback signal terminal
Quasi- voltage is equal.The sampled voltage of each feedback can be thus compared with same preset reference voltage.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, when corresponding with each feedback signal terminal default
When reference voltage is equal, as shown in figure 5, feedback subelement 21, can specifically include：Voltage comparator OP, phase inverter N, and it is brilliant
Body triode Q2；Wherein,
Voltage comparator OP has a normal phase input end, an output end and drives the anti-of submodule 2231 with each
Feedback signal end Vr corresponds connected negative-phase input, and normal phase input end is used to receive preset reference voltage Vref, output end
It is connected with phase inverter N input, phase inverter N output end is connected with transistor Q2 base stage；Voltage comparator OP is used
In when the voltage of at least one negative-phase input is more than the voltage of normal phase input end, voltage comparator OP output end is led to
Cross phase inverter N output control voltages；
Transistor Q2 grounded emitter, transistor Q2 colelctor electrode is connected with signal modulation module；Crystal
Triode is used for when obtaining control voltage by phase inverter N, and feedback control is sent to signal modulation module 222 by colelctor electrode
Signal.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, in order to play electrostatic protective function, such as Fig. 6
It is shown, subelement 21 is fed back, can also be included：Crystal diode D1；Wherein,
Crystal diode D1 plus earth, crystal diode D1 negative pole is connected with phase inverter N output end.So,
When there is no electrostatic, the current direction transistor Q2 of phase inverter N output end, when there is electrostatic, phase inverter N output end
KV level high electrical breakdown crystal diode D1 so that with ground formation loop, and then quiet is played to whole feedback subelement
The effect of electric protection.
Further, in the specific implementation, the conducting voltage of transistor triode is typically smaller, and voltage comparator is passed through
Cross the voltage that is exported after phase inverter general than larger, therefore, in above-mentioned backlight module provided in an embodiment of the present invention, such as Fig. 6
It is shown, subelement 21 is fed back, can also be included：Second resistance R2 and 3rd resistor R3；Wherein,
Second resistance R2 one end is connected with phase inverter N output end, the negative pole of the other end respectively with crystal diode D1
It is connected with transistor Q2 base stage；
3rd resistor R3 is connected between transistor Q2 base stage and emitter stage.So utilize second resistance and the 3rd
Resistance carries out partial pressure, so as to the voltage Tiao Jiedao crystal three-levels for being exported the output end of voltage comparator by phase inverter
Optimal cut-in voltage scope needed for pipe.
It is above-mentioned to feed back subelement when being and being compared the use voltage of each feedback signal terminal and same preset reference voltage
Specific embodiment.In the specific implementation, when preset reference voltage corresponding with each feedback signal terminal is differed, due to anti-
Feedback subelement needs the sampled voltage for feeding back each feedback signal terminal to be compared respectively with corresponding voltage preset reference voltage
Compared with, therefore the structure of feedback subelement can be relative complex in the specific implementation.For example shown in Fig. 7, feedback subelement 21 can be wrapped
Include and the one-to-one feedback module of each feedback signal terminal 211；One feedback module 211 includes voltage comparator OP, one
An individual phase inverter N and transistor Q2；Wherein,
Voltage comparator OP has normal phase input end, output end, connected with corresponding feedback signal terminal Vr
Negative-phase input, normal phase input end is used to receive preset reference voltage Vref, and output end is connected with phase inverter N input, instead
Phase device N output end is connected with transistor Q2 emitter stage；Voltage comparator OP is used for, when the voltage of negative-phase input is big
When the voltage of normal phase input end, voltage comparator OP output end passes through phase inverter N output control voltages；
Transistor Q2 base earth, transistor Q2 colelctor electrode is connected with signal modulation module；Crystal three
Level is managed for when obtaining control voltage by phase inverter N, sending feedback control to signal modulation module 222 by colelctor electrode and believing
Number.
It the above is only the concrete structure for illustrating and subelement being fed back in backlight module, in the specific implementation, feedback is single
Member concrete structure be not limited to said structure provided in an embodiment of the present invention, can also be skilled person will appreciate that other
Structure, is not limited herein.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, as shown in figure 8, signal modulation module 222,
It is able to can specifically include：With the one-to-one signal modulation submodule 2221 of each luminescent device group 1；Wherein,
Each signal modulation submodule 2221 has the first signal input part A1, secondary signal input A2 and drive signal defeated
Go out to hold A3；First signal input part A1, for receive signal output module 221 output with corresponding to corresponding luminescent device group 1
Pulse width modulating signal PWM；Secondary signal input A2, for receiving the feedback control letter that feedback subelement 21 is exported
Number；
Signal modulation submodule 2221, for only pulse width modulating signal PWM ought to be received by the first signal input part A1
When, the first driving control signal or the second driving are exported to drive signal output terminals A 3 according to each pulse width modulating signal PWM
Control signal；When secondary signal input A1 receives feedback control signal, driven to the output of drive signal output terminals A 3 second
Dynamic control signal；
Drive module 223, first is exported for the drive signal output terminals A 3 in corresponding signal modulation submodule 2221
During driving control signal, corresponding luminescent device group 1 is controlled to open；In the drive signal of corresponding signal modulation submodule 2221
When output terminals A 3 exports the second driving control signal, corresponding luminescent device group 1 is controlled to close.
It is preferred that in above-mentioned backlight module provided in an embodiment of the present invention, as shown in figure 9, signal modulation submodule
2221, including：Photoisolator OC；Photoisolator OC includes：First input end, the second input, the first reference signal end
V1, the second reference signal end V2, output end, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the first photophore O1,
Second photophore O2 and light-receiving device C1；Wherein,
Photoisolator OC first input end be signal modulation submodule 2221 the first signal input part A1, photoelectricity every
The second input from device OC is the secondary signal input A2 of signal modulation submodule 2221；Photoisolator OC output end
For the drive signal output terminals A 3 of signal modulation submodule 2221；
First photophore O1 and the 4th resistance R4 are series between first input end and the second reference signal end V2；Second hair
Light device O2 and the 5th resistance R5 are series between the first reference signal end V1 and the second input；Light-receiving device C1 passes through the 6th resistance
R6 is connected with the first reference signal end V1, and the light-receiving device C1 other end is connected with the second reference signal end V2, light-receiving device C1 and
One end connected six resistance R6 is photoisolator OC output end；
When photoisolator OC first input end receives pulse width modulating signal PWM, the first photophore O1 hairs
Light does not light, when photoisolator OC the second input receives feedback control signal, and the second photophore O2 lights；When
When first photophore O1 and/or the second photophore O2 lights, light-receiving device C1 two ends are in the conduction state, photoisolator OC's
Output end exports the second driving control signal, when the first photophore O1 and the second photophore O2 does not light, light-receiving device C1's
Two ends are in cut-off state, and photoisolator OC output end exports the first driving control signal.
Specifically, in above-mentioned backlight module provided in an embodiment of the present invention, when the voltage at the first reference signal end is more than
During the voltage of the second reference edge, as shown in figure 9, the switch controller Q1 in driving submodule 2231 can switch crystal for N-type
Pipe；When the voltage at the first reference signal end is less than the voltage of the second reference edge, the switch controller in driving submodule 2231
Q1 can be p-type switching transistor, be not limited thereto.
It the above is only the concrete structure for illustrating signal modulation submodule in backlight module, in the specific implementation, signal
The concrete structure of modulation submodule is not limited to said structure provided in an embodiment of the present invention, can also be that those skilled in the art can
The other structures known, are not limited herein.
The work of above-mentioned backlight module provided in an embodiment of the present invention is described in detail by taking backlight module shown in Fig. 9 as an example below
Make principle.Specifically, in backlight module shown in Fig. 9, the first reference signal end V1 voltage is more than the second reference signal end V2
Voltage, driving submodule 2231 in switch controller Q1 be N-type switching transistor.
1st, when each road luminescent device group 1 of backlight module is normal, the feedback signal terminal Vr of each driving submodule 2231 is defeated
The feedback voltage gone out is respectively less than or equal to corresponding preset reference voltage, and the voltage comparator OP in feedback subelement 21 passes through anti-
Phase device N does not have control voltage output, and transistor Q2 is in cut-off state, therefore feedback subelement not believe by output feedback ontrol
Number, only signal output module 221 is modulated to photoisolator OC output pulse widths corresponding with each road luminescent device group and believed
Number PWM.If pulse width modulating signal PWM current potential is high potential, the first light-receiving device O1 in photoisolator OC lights, by
Light device is in the conduction state, and the voltage of the second driving control signal of photoisolator OC output end output is the of low potential
Open pipe control in two reference signal end V2 voltage, therefore the corresponding driving submodule 2231 of the second driving control signal control
Device Q1 is in cut-off state, and corresponding luminescent device is closed；If pulse width modulating signal PWM current potential is low potential, photoelectricity
The first light-receiving device in isolator OC does not light, and light-receiving device is in cut-off state, the of photoisolator OC output end output
The voltage of one driving control signal subtracts voltage on the 6th resistance for the first reference signal end V2 of high potential voltage, therefore the
Open pipe controller Q1 in the corresponding driving submodule 2231 of one driving control signal control is in the conduction state, corresponding luminous
Device is opened.
2nd, when backlight module has luminescent device group to be short-circuited, the feedback signal of at least one driving submodule 2231
The voltage comparator OP for holding the feedback voltage of Vr outputs to be more than in corresponding preset reference voltage, feedback subelement 21 passes through anti-phase
Device N output control voltages, transistor Q2 is in the conduction state, therefore feedback subelement output feedback ontrol signal.Now,
No matter the current potential for the pulse width modulating signal PWM that signal output module 221 is exported is high potential or low potential, sent out with each road
The second light-receiving device O2 in the corresponding photoisolator OC of optical device group lights, and light-receiving device is in conducting state, photoelectricity every
The voltage of second driving control signal of the output end output from device OC is the second reference signal end V2 of low potential voltage, because
All open pipe controller Q1 are in cut-off state in all driving submodules 2231 of this second driving control signal control, all
Luminescent device is turned off.
The electric current that above-mentioned backlight module provided in an embodiment of the present invention flows through each luminescent device group by detection determines whether
There is luminescent device group to be short-circuited, when it is determined that there is luminescent device group to be short-circuited, in time close all luminescent device groups,
So as to avoid circuit burnout etc. caused by luminescent device group is short-circuited from losing.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of liquid crystal display, including the embodiment of the present invention
Any of the above-described kind of backlight module provided.Because the liquid crystal display solves the principle and a kind of foregoing backlight module phase of problem
Seemingly, therefore the implementation of the liquid crystal display may refer to the implementation of backlight module, repeat part and repeat no more.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of display device, including the embodiment of the present invention is carried
Any of the above-described kind of liquid crystal display supplied.The display device can be：Mobile phone, panel computer, television set, notebook computer, number
Any product or part with display function such as code-phase frame, navigator.The implementation of the display device may refer to above-mentioned liquid crystal
The embodiment of display, repeats part and repeats no more.
A kind of backlight module provided in an embodiment of the present invention, liquid crystal display and display device, backlight module include multichannel
Luminescent device group and feedback control unit；When the sampled voltage that feedback control unit detects at least luminescent device group all the way surpasses
When crossing preset value, illustrate to have luminescent device group to be short-circuited phenomenon, so as to control all luminescent device groups to close.Therefore the back of the body
Optical mode group in time can be closed all luminescent device groups when luminescent device group is short-circuited using feedback control unit, from
And circuit burnout etc. caused by luminescent device group is short-circuited can be avoided to lose.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and modification of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (11)
1. a kind of backlight module, including multichannel luminescent device group, feedback control unit；
The feedback control unit, is specifically included：Feed back subelement and drive control subelement；The feedback subelement, is used for
The sampled voltage of luminescent device group described in each road is detected, when at least the sampled voltage of the luminescent device group exceedes preset value all the way
When, output feedback ontrol signal；The drive control subelement, for according to feedback control signal control is all
Luminescent device group is closed, and is additionally operable to control the unlatching of luminescent device group described in each road according to pulse width modulating signal；Wherein,
The drive control subelement, is specifically included：Signal output module, signal modulation module and drive module；Wherein, it is described
Signal output module, for being exported and the one-to-one pulse width of luminescent device group described in each road to the signal modulation module
Modulated signal；The signal modulation module, is specifically included：With each one-to-one signal modulation submodule of luminescent device group
Block；Wherein, each signal modulation submodule has the first signal input part, secondary signal input and drive signal output
End；First signal input part, for receive signal output module output with corresponding to corresponding luminescent device group
Pulse width modulating signal；The secondary signal input, the feedback control signal for receiving the feedback subelement output；
The drive module, for exporting the first drive control letter in the drive signal output end of the corresponding signal modulation submodule
Number when, control corresponding luminescent device group to open；Exported in the drive signal output end of the corresponding signal modulation submodule
During the second driving control signal, corresponding luminescent device group is controlled to close；Wherein,
The signal modulation submodule includes：Photoisolator；The photoisolator includes：First input end, the second input
End, the first reference signal end, the second reference signal end, output end, the 4th resistance, the 5th resistance, the 6th resistance and the first hair
Light device, the second photophore and light-receiving device；Wherein,
The first input end of the photoisolator be the signal modulation submodule the first signal input part, the photoelectricity every
From device the second input be the signal modulation submodule secondary signal input；The output end of the photoisolator is
The drive signal output end of the signal modulation submodule；First photophore and the 4th resistant series are in the first input
Between end and the second reference signal end；Second photophore and the 5th resistant series are in first reference signal
Between end and second input；One end of the light-receiving device passes through the 6th resistance and the first reference signal end phase
Even, the other end of the light-receiving device is connected with the second reference signal end, and the light-receiving device is connected with the 6th resistance
One end is the output end of photoisolator；When the first input end of the photoisolator receives pulse width modulating signal
When, first photophore is luminous or does not light, when the second input of the photoisolator receives feedback control signal
When, second photophore lights；When first photophore and/or luminous second photophore, the light-receiving device
Two ends are in the conduction state, and the output end of the photoisolator exports the second driving control signal, when first photophore
When not lighted with second photophore, the two ends of the light-receiving device are in cut-off state, the output of the photoisolator
The first driving control signal of end output.
2. backlight module as claimed in claim 1, it is characterised in that the drive control subelement, is specifically included：Signal is defeated
Go out module, signal modulation module and drive module；Wherein,
The signal output module, for exporting one-to-one with luminescent device group described in each road to the signal modulation module
Pulse width modulating signal；
The signal modulation module, for when only receiving the pulse width modulating signal, according to each pulse width
Modulated signal controls drive module driving luminescent device group unlatching corresponding with each pulse width modulating signal；When connecing
When receiving the feedback control signal of the feedback subelement output, the drive module is controlled to control all luminescent device groups to close
Close.
3. backlight module as claimed in claim 2, it is characterised in that the drive module, is specifically included：With being sent out described in each road
Optical device group is one-to-one respectively to drive submodule；Wherein,
Each driving submodule includes：With corresponding luminescent device group connect switch controller and first resistor, for
The luminescent device group and the first resistor provide the luminous voltage source of voltage, and positioned at the luminescent device group with it is described
Between first resistor and for the feedback signal terminal for the sampled voltage that the luminescent device group is fed back to the feedback subelement；Its
In, the sampled voltage is the voltage of the first resistor, the control end of the switch controller and the signal modulation module
It is connected, under the control of the signal modulation module, controlling being turned on and off for the luminescent device group.
4. backlight module as claimed in claim 3, it is characterised in that the feedback subelement, specifically for：
Detect the sampled voltage that the feedback signal terminal of each driving submodule is fed back；By the sampled voltage of the feedback with it is right
Preset reference voltage corresponding to the feedback signal terminal answered is compared；If the sampled voltage of at least one feedback is more than
Corresponding preset reference voltage, to the signal modulation module output feedback ontrol signal.
5. backlight module as claimed in claim 4, it is characterised in that the quantity of the luminescent device in each luminescent device group
It is identical, and each same luminous voltage source of luminescent device group correspondence.
6. backlight module as claimed in claim 5, it is characterised in that preset reference electricity corresponding with each feedback signal terminal
Pressure is equal.
7. backlight module as claimed in claim 6, it is characterised in that the feedback subelement, is specifically included：Voltage ratio compared with
Device, phase inverter and transistor；Wherein,
The voltage comparator has a normal phase input end, an output end and the feedback with each driving submodule
Signal end corresponds connected negative-phase input, and the normal phase input end is used to receive the preset reference voltage, described defeated
Go out end with the input of the phase inverter to be connected, the output end of the phase inverter is connected with the base stage of the transistor；When
When the voltage of at least one negative-phase input is more than the voltage of the normal phase input end, the output of the voltage comparator
End passes through the phase inverter output control voltage；
The grounded emitter of the transistor, the colelctor electrode of the transistor is connected with the signal modulation module；
The transistor is used for when obtaining the control voltage by phase inverter, by the colelctor electrode to the signal modulation
Module sends feedback control signal.
8. backlight module as claimed in claim 7, it is characterised in that the feedback subelement, also includes：Crystal diode；
Wherein,
The plus earth of the crystal diode, the negative pole of the crystal diode is connected with the output end of the phase inverter.
9. backlight module as claimed in claim 8, it is characterised in that the feedback subelement, also includes：Second resistance and
Three resistance；Wherein,
One end of the second resistance is connected with the output end of the phase inverter, and the other end is negative with the crystal diode respectively
Pole is connected with the base stage of the transistor；
The 3rd resistor is connected between the base stage of the transistor and emitter stage.
10. a kind of liquid crystal display, it is characterised in that including the backlight module as described in claim any one of 1-9.
11. a kind of display device, it is characterised in that including liquid crystal display as claimed in claim 10.
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| CN105161058B (en) * | 2015-07-29 | 2017-11-28 | 青岛海信电器股份有限公司 | Multichannel backlight driving system, liquid crystal display and LCD TV |
| CN105096869B (en) * | 2015-08-10 | 2017-12-26 | 上海闻泰电子科技有限公司 | The method for solving series connection backlight overtension |
| CN107481678A (en) * | 2017-09-14 | 2017-12-15 | 京东方科技集团股份有限公司 | Backlight drive current monitoring circuit, method and the display device of backlight module |
| CN113160761B (en) | 2021-04-20 | 2023-10-03 | 惠州市华星光电技术有限公司 | Driving method, driving circuit and display device |
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| CN101452677B (en) * | 2007-11-30 | 2012-01-04 | 广达电脑股份有限公司 | Drive device, backlight module and drive method |
| KR101473366B1 (en) * | 2008-03-05 | 2014-12-17 | 삼성디스플레이 주식회사 | Method for driving a light source, light source apparatus for performing the method, and display apparatus having the light source apparatus |
| CN101916548B (en) * | 2010-07-22 | 2012-08-08 | 福建捷联电子有限公司 | Control circuit of light-emitting diode (LED) lamp tube of liquid crystal display |
| CN101916550B (en) * | 2010-08-18 | 2012-06-27 | 福建捷联电子有限公司 | Light emitting diode driving circuit |
| JP2013021117A (en) * | 2011-07-11 | 2013-01-31 | Rohm Co Ltd | Led drive device, luminaire, and liquid crystal display device |
| US8836242B2 (en) * | 2012-11-29 | 2014-09-16 | Shenzhen China Star Optoelectronics Technology, Co., Ltd. | LED voltage adjustment device and drive system thereof |
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