CN207781160U - A kind of LED light bar, backlight module, liquid crystal display die set and terminal device - Google Patents
A kind of LED light bar, backlight module, liquid crystal display die set and terminal device Download PDFInfo
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- CN207781160U CN207781160U CN201721663044.8U CN201721663044U CN207781160U CN 207781160 U CN207781160 U CN 207781160U CN 201721663044 U CN201721663044 U CN 201721663044U CN 207781160 U CN207781160 U CN 207781160U
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Abstract
The utility model discloses a kind of LED light bar, backlight module, liquid crystal display die set and terminal devices.First output end of the control module of the lamp bar is electrically connected with the input terminal of break-make control module, and the pwm signal for modulating setting duty ratio is sent to break-make control module；The input terminal that the second output terminal of control module adjusts module with current amplitude is electrically connected, for sending reference voltage signal to current amplitude adjustment module；Break-make control module is connected with LED light, and the supply line for controlling LED light according to pwm signal is turned on or off；Current amplitude adjustment module is connected with LED light, for generating current signal according to reference voltage signal and based on the amplitude of reference voltage signal adjustment current signal；LED light is used as light source for shining when supply line is connected；Wherein, the root mean square that the electric current of LED light is flowed through in unit period remains unchanged.Realize the brightness for not influencing LED light simultaneously, improve the persistence of vision.
Description
Technical field
The utility model embodiment is related to LCD technology more particularly to a kind of LED light bar, backlight module, liquid crystal
Show module and terminal device.
Background technology
With the development of LCD technology, requirement of the people to liquid crystal display is also higher and higher, and LED (Light
Emitting Diode, light emitting diode) one kind of liquid crystal display as display, since LED is as the luminous phase of backlight
It shines evenly for CCFL (Cold Cathode Fluorescent Lamp, cathode fluorescent tube), service life is more
The advantages that length, the feature of environmental protection is more preferable, application is more and more extensive.And application of the light regulating technology in LED illumination will further improve LED
The display effect of liquid crystal display.
How to be realized while maintaining brightness by carrying out light modulation to LED, reduces picture ghost when brain stops
Between, bring better viewing experience.In view of the above-mentioned problems, currently no effective solution has been proposed.
Invention content
A kind of LED light bar of the utility model offer, backlight module, liquid crystal display die set and terminal device, are being tieed up with realizing
While holding brightness, picture ghost is reduced in brain residence time, brings better viewing experience.
In a first aspect, the utility model embodiment provides a kind of LED light bar, which includes：Control module is led to
Disconnected control module, current amplitude adjustment module and LED light, wherein：
First output end of the control module is electrically connected with the input terminal of the break-make control module, is set for modulating
The pwm signal for determining duty ratio is sent to the break-make control module；The second output terminal of the control module and the electric current width
The input terminal electrical connection of value adjustment module, for sending reference voltage signal to current amplitude adjustment module；
The break-make control module is connected with the LED light, the confession for controlling the LED light according to the pwm signal
Electric line is turned on or off；
The current amplitude adjustment module is connected with the LED light, for generating electric current according to the reference voltage signal
Signal and the amplitude that the current signal is adjusted based on the reference voltage signal；
The LED light is used as light source for shining when the supply line is connected；
Wherein, the root mean square that the electric current of the LED light is flowed through in unit period remains unchanged.
Further, the break-make control module includes the first metal-oxide-semiconductor；
The grid of first metal-oxide-semiconductor is electrically connected with the first output end of the control module, first metal-oxide-semiconductor
Source electrode and drain electrode is series at the supply line of the LED light.
Further, the current amplitude adjustment module includes：Operational amplifier, first resistor, the 2nd shops MOS and
Two resistance；
The noninverting input of the operational amplifier is electrically connected with the second output terminal of the control module；The operation is put
The reverse input end of big device is electrically connected with the source electrode of second metal-oxide-semiconductor；The output end of the operational amplifier and described first
One end of resistance is electrically connected；
The other end of the first resistor is electrically connected with the grid of second metal-oxide-semiconductor；
The drain electrode of second metal-oxide-semiconductor is electrically connected with the source electrode of the first metal-oxide-semiconductor；The source electrode of second metal-oxide-semiconductor with it is described
One end of second resistance is electrically connected；
The other end of the second resistance is grounded.
Further, one end of the LED light is electrically connected with DC power supply, the drain electrode of the other end and the first MOS pipes
Electrical connection.
Further, the number of the LED light is at least two.
Preferably, first metal-oxide-semiconductor and second metal-oxide-semiconductor are IRF640 type field-effect tube.
Preferably, the operational amplifier is OP07 type operational amplifiers.
Second aspect, the utility model embodiment additionally provide a kind of backlight module, which includes described previously
LED light bar.
The third aspect, the utility model embodiment additionally provide a kind of liquid crystal display die set, which includes
Previously described backlight module.
Fourth aspect, the utility model embodiment additionally provide a kind of terminal device, which includes described previously
Liquid crystal display die set.
The utility model modulates PWM (Pulse Width Modulation, the arteries and veins of duty ratio diminution by control module
Rush width modulated) signal, and then break-make control module shortens the turn-on time of the supply line of LED lamps according to pwm signal,
And module is adjusted according to current amplitude and exports increased current signal so that when the supply line of LED light is in the conduction state,
The electric current for flowing through LED light increases, to realize the root mean square for the electric current for flowing through LED light in rear unit period before adjustment not
Become, while shortening the turn-on time of LED light, realize how while not influencing the brightness of LED light, it is temporary to improve vision
It stays, improves the viewing experience of user.
Description of the drawings
Fig. 1 a are a kind of structural schematic diagrams of LED light bar in the utility model embodiment one；
Fig. 1 b are the pwm signals of the setting duty ratio modulated in the utility model embodiment one；
Fig. 1 c are the pwm signals of the setting duty ratio modulated in the utility model embodiment one；
Fig. 1 d are the current waveform schematic diagrames that LED light is flowed through before and after the adjustment in the utility model embodiment one；
Fig. 2 is a kind of circuit diagram of LED light bar in the utility model embodiment two.
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, it illustrates only for ease of description, in attached drawing and the relevant part of the utility model rather than entire infrastructure.
Embodiment one
Fig. 1 a are a kind of structural schematic diagram for LED light bar that the utility model embodiment one provides, and the present embodiment is applicable
In improve user's persistence of vision the case where, as shown in Figure 1a, which can specifically include：Control module 110, break-make control
Molding block 120, current amplitude adjustment module 130 and LED light 140, below illustrate its structure and function.
First output end of control module 110 is electrically connected with the input terminal of break-make control module 120, for modulating setting
The pwm signal of duty ratio is sent to break-make control module 120；The second output terminal of control module 110 adjusts mould with current amplitude
The input terminal of block 130 is electrically connected, for sending reference voltage signal to current amplitude adjustment module 130；
Break-make control module 120 is connected with LED light 140, the supply line for controlling LED light 140 according to pwm signal
Be turned on or off；
Current amplitude adjustment module 130 is connected with LED light 140, for generating current signal simultaneously according to reference voltage signal
The amplitude of current signal is adjusted based on reference voltage signal；
LED light 140 is used as light source for shining when supply line is connected；
Wherein, the root mean square that the electric current of LED light 140 is flowed through in unit period remains unchanged.
In specific embodiment of the utility model, when supply line is connected, LED light 140, which shines, is used as light source, light modulation
It is a critically important function.Currently, the common dimming mode of LED light 140 has two kinds of simulation light modulation and digital dimming, wherein
Digital dimming is also referred to as PWM light modulations, is a kind of dimming mode being widely used at present, " width " mentioned here, refers to pulse
High level time.Specifically, PWM be it is a kind of digitally coded method is carried out to analog signal level, pass through high-resolution
The use of counter, the duty ratio of square wave is modulated to be encoded for the level to a physical simulation signal, and pwm signal is still
So digital because at given any moment, or the direct current supply of full amplitude have completely (ON) or entirely without
(OFF).Voltage or current source are to be added to what fictitious load got on a kind of repetition pulse sequence being turned on or off.Conducting
It is that direct current supply is added in load, disconnection is that direct current supply is disconnected, and such dimming mode takes full advantage of human eye
Persistance of human vision.This is because when the flicker frequency of LED light 140 reaches 200Hz or more, human eye, which can not be identified, to be come,
Only average brightness seen by person, rather than the flicker of LED lamps 140.PWM light modulations are connected by adjusting LED light 140
(or bright) time and the ratio for disconnecting (or dark) time adjust its brightness to realize, and the signal period is constant.It is exemplary
, as LED lamps 140 can generate with 25% turn-on time 25% brightness.
In order to realize that the flicker of LED light 140 can not be identified in human eye, usual modulating frequency is between 1KHz to 200KHz.It closes
In the above-mentioned duty ratio referred to, refer to effective time that the ratio between turn-on time and signal period or circuit release energy with it is total
The ratio between release time；Correspondingly, modulating frequency refers to the inverse of signal period.Further, since when LED light 140 is connected, lead to
It is constant to cross its electric current, therefore will not cause the offset of chromatography, and because impulse waveform easily-controllable property, thus this light modulation
Mode has high light modulation accuracy.
Currently, many microcontrollers all include PWM controller, control module 110 can be to include PWM controller
Microcontroller.The PWM controller of control module 110 is used to modulate the pwm signal of setting duty ratio, illustratively, such as schemes
1b, 1c show the pwm signal of the setting duty ratio modulated, wherein turn-on time in Fig. 1 bIt is with the ratio between signal period T
0.5, therefore modulate the PWM signals that duty ratio is 0.5；Turn-on time in Fig. 1 cIt is 0.25 with the ratio between signal period T, therefore adjusts
Make the pwm signal that duty ratio is 0.25.It should be noted that the different pwm signal of duty ratio is modulated, when being only connected
Between change, and the amplitude of the corresponding pulse signal of turn-on time is constant, i.e. the H in H and Fig. 1 c in Fig. 1 b is " equal.
And the pwm signal is sent to break-make control module 120, and then break-make control module 120 controls LED light according to the pwm signal
Supply line be turned on or off.Optionally, break-make control module 120 can be metal-oxide-semiconductor (Metal Oxide
Semiconductor, insulating gate type field effect tube), correspondingly, the grid of the first output end of control module 110 and metal-oxide-semiconductor is electric
Connection, when the supply line of LED light 140 is off, the source voltage of the metal-oxide-semiconductorThe metal-oxide-semiconductor at this time
Gate source voltageThat is gate source voltageEqual to grid voltageSimultaneously as grid voltageIt is by defeated
The pwm signal control entered, thus, the gate source voltage of the metal-oxide-semiconductorJust it is controlled by the pwm signal inputted.Preferably, metal-oxide-semiconductor is
N-channel depletion type MOS tube, on the basis of above-mentioned, and according to the operation principle of N-channel depletion type MOS tube it is found that when PWM believes
Number (i.e. gate source voltage) when being more than the pinch-off voltage of N-channel depletion type MOS pipe, the drain electrode of N-channel depletion type MOS tube and source
Pole is connected, and controls the conducting of the supply line of LED light 140；When pwm signal (i.e. gate source voltage) it is less than N-channel depletion type
When the pinch-off voltage of metal-oxide-semiconductor, the drain electrode of N-channel depletion type MOS tube and source electrode disconnect, and control the disconnected of the supply line of LED light 140
It opens.
It can be seen from the above, using PWM light-dimming methods, i.e., the ratio by adjusting 140 turn-on time of LED light and turn-off time
Example, can according to the pwm signal that Fig. 1 b and Fig. 1 the c duty ratios modulated are respectively 0.5 and 0.25 to realize the adjusting of its brightness
Know, the brightness of the LED light 140 of the pwm signal for being 0.5 by duty ratio control is more than what the pwm signal that duty ratio is 0.25 controlled
The brightness of LED light 140.This is because in unit period, in the case where the former controls, the root mean square for flowing through the electric current of LED light 140 is big
Under being controlled in the latter, the root mean square of the electric current of LED light 140 is flowed through.And do not influencing the same of 140 brightness of LED light to realize
When, improve the persistence of vision, it is necessary to while ensureing that the root mean square for the electric current for flowing through LED light 140 afterwards before adjustment is constant, shorten
The turn-on time of LED light 140.In order to meet above-mentioned condition simultaneously, it is also necessary to cooperation adjustment flows through the electric current of LED light 140, even if
The electric current that LED light 140 must be flowed through increases, and only passes through aforesaid operations, could realize the electric current that LED light 140 is flowed through before and after adjusting
Root mean square it is constant, and then realize while not influencing 140 brightness of LED light, improve the persistence of vision.
Optionally, current amplitude adjustment module 130 can be the controlled constant-current source circuit of Linear Control, operation principle
For：Pass through the current signal of the reference voltage signal control output of input, wherein the reference electricity of the current signal of output and input
Press signal linear.In order to enable the electric current for flowing through LED light 140 increases, correspondingly, needing to increase the reference voltage inputted
Signal, the current signal exported in this way just increase therewith, when the supply line of LED light 140 is in the conduction state, flow through LED
The electric current of lamp 140 also just increases.
Based on above-mentioned, the pwm signal of duty ratio diminution, and then break-make control module 120 are modulated by control module 110
The turn-on time of the supply line of LED light 140 is shortened according to pwm signal, and the output of module 130 is adjusted according to current amplitude and is increased
Big current signal so that when the supply line of LED light 140 is in the conduction state, the electric current for flowing through LED light 140 increases.From
And the root mean square for the electric current for flowing through LED light 140 in unit period after realizing before adjustment is constant, while shortening LED light 140
Turn-on time.Also it is achieved that while not influencing 140 brightness of LED light, improves the persistence of vision.
Illustratively, as shown in Figure 1 d, square wave 1 is the current waveform schematic diagram that LED light 140 is flowed through before adjusting, and square wave 2 is
The current waveform schematic diagram of LED light 140 is flowed through after adjustment, wherein ε1And ε1When respectively adjusting the conducting of front and back LED light 140
Between, T is the signal period, I andThe amplitude of the electric current of LED lamps 140 is flowed through before and after respectively adjusting.As seen from the figure,After adjusting, the turn-on time of LED light 140 is shortened, while when the supply line of LED light 140 is in
When conducting state, the electric current for flowing through LED light 140 increases.But adjustment is front and back to be metBefore and after adjusting
The root mean square for flowing through the electric current of LED light 140 is constant.
The technical solution of the present embodiment modulates the pwm signal of duty ratio diminution by control module, and then break-make controls
Module shortens the turn-on time of the supply line of LED light according to pwm signal, and adjusts module output according to current amplitude and increase
Current signal so that when the supply line of LED light is in the conduction state, flow through LED light electric current increase, to realize
The root mean square for the electric current for flowing through LED light in unit period after before adjustment is constant, while shortening the turn-on time of LED light, real
Show how while not influencing the brightness of LED light, has improved the persistence of vision, improve the viewing experience of user.
Further, based on the above technical solution, the number of LED light 140 is at least two.
Embodiment two
Fig. 2 is a kind of circuit diagram for LED light bar that the utility model embodiment two provides, and the present embodiment is applicable to
The case where improving user's persistence of vision, as shown in Fig. 2, on the basis of the above embodiments, the break-make control in the LED light bar
Module 120 includes the first metal-oxide-semiconductor 1201, and current amplitude adjustment module 130 includes：Operational amplifier 1301, first resistor
1302, the second metal-oxide-semiconductor 1303 and second resistance 1304；LED light 140 includes at least two LED1401；
The grid of first metal-oxide-semiconductor 1201 is electrically connected with the first output end PWM of control module 110, the first metal-oxide-semiconductor 1201
Source electrode and drain electrode be series at the supply line of LED light 140；
The noninverting input of operational amplifier 1301 and the second output terminal V of control module 110REFElectrical connection；Operation amplifier
The reverse input end of device 1301 is electrically connected with the source electrode of the second metal-oxide-semiconductor 1303；The output end of operational amplifier 1301 and the first electricity
One end electrical connection of resistance 1302；
The other end of first resistor 1302 is electrically connected with the grid of the second metal-oxide-semiconductor 1303；
The drain electrode of second metal-oxide-semiconductor 1303 is electrically connected with the source electrode of the first metal-oxide-semiconductor 1201；The source electrode of second metal-oxide-semiconductor 1303 with
One end of second resistance 1304 is electrically connected；
The other end of second resistance 1304 is grounded.
In specific embodiment of the utility model, optionally, the first metal-oxide-semiconductor 1201 and the second metal-oxide-semiconductor 1303 can be
N-channel depletion type MOS tube, when the first metal-oxide-semiconductor 1201 and the second metal-oxide-semiconductor 1303 are operated in saturation region, above-mentioned operational amplifier
1301, first resistor 1302, the second metal-oxide-semiconductor 1303 and second resistance 1304 can form the voltage controlled current source electricity of Linear Control
Road, below with the first metal-oxide-semiconductor 1201 and the second metal-oxide-semiconductor 1303 for N-channel depletion type MOS tube, current amplitude adjustment module 130 is
It is illustrated for the voltage controlled current source of Linear Control.
Metal-oxide-semiconductor is voltage control device, it utilizes gate source voltage VGSTo control drain current IdVariation.When metal-oxide-semiconductor work
When making in saturation region, drain currentIt depends primarily onAnd almost withIt is unrelated.N-channel depletion type MOS tube is p-type base
Bottom, in SiO2A large amount of cation is mixed in insulating layer in advance, under the electric field action that these cations generate, in P
Type substrate surface induces more free electron, forms inversion layer, and conducting channel is established between drain-source.Depletion type refers to
WhenWhen, conducting channel has been established in pipe, adds appropriate polar It is gradually decreased and (exhausts).WhenPolarity be
When reversed and voltage reaches certain value,The electric field of generation completely cancels out the electric field of cation induction, and inversion layer is made to disappear,
Drain currentIt is zero, gate source voltage at this time is called pinch-off voltageI.e.In addition, working as gate source voltage
When, because there is the isolation of insulating layer, it not will produce grid currentI.e.
In conjunction with explanation above, when the supply line of LED light 140 is off, the source of the first metal-oxide-semiconductor 1201
Pole tensionThe gate source voltage of first metal-oxide-semiconductor 1201 at this timeThat is gate source voltageEqual to grid electricity
PressureSimultaneously as grid voltageIt is the pwm signal control by inputting, thus, the gate source voltage of the first metal-oxide-semiconductor 1201Just it is controlled by the pwm signal inputted.Based on above-mentioned, when pwm signal (the i.e. gate source voltage of the first metal-oxide-semiconductor 1201) be more than
The pinch-off voltage of first metal-oxide-semiconductor 1201When, the drain electrode of the first metal-oxide-semiconductor 1201 and source conduction control the power supply of LED light 140
The conducting of circuit；When pwm signal (the i.e. gate source voltage of the first metal-oxide-semiconductor 1201) it is less than the pinch-off voltage of the first metal-oxide-semiconductor 1201When, the drain electrode of the first metal-oxide-semiconductor 1201 and source electrode disconnect, and control the disconnection of the supply line of LED light 140.At this point, the first MOS
Pipe 1201 functions similarly to the effect of switch, and the turn-on time of supply line, the i.e. turn-on time of LED are accounting for by pwm signal
Sky is than decision.
Lower mask body introduction is when the second metal-oxide-semiconductor 1303 works in saturation region, operational amplifier 1301, first resistor
1302, the operation principle of the controlled constant-current source circuit for the Linear Control that the second metal-oxide-semiconductor 1303 and second resistance 1304 form.By preceding
Text description is it is found that when the second metal-oxide-semiconductor 1303 works in saturation region, the drain current of the second metal-oxide-semiconductor 1303It depends primarily on
The gate source voltage of second metal-oxide-semiconductor 1303And the almost drain-source voltage V with the second metal-oxide-semiconductor 1303DSIt is unrelated, i.e. the second metal-oxide-semiconductor
1303 drain currentAs long as the gate source voltage of the second metal-oxide-semiconductor 1303It is constant, the leakage of the second metal-oxide-semiconductor 1303
Electrode currentWith regard to constant.In this circuit, second resistance 1304 be sampling resistor, it is preferred that using constantan wire coiling (resistance value with
The variation of temperature is smaller)；Operational amplifier 1301 can be used as voltage follower, the noninverting input of operational amplifier 1301 defeated
Enter is reference voltage signalI.e.The voltage of the noninverting input of operational amplifier 1301 is equal to operation simultaneously
The voltage of the reverse input end of amplifier 1301I.e.AgainWherein, IzFor the second metal-oxide-semiconductor 1303
Source current,For second resistance, thus,Due to working as gate source voltageWhen, because there is insulating layer
Isolation, not will produce grid currentI.e.Therefore, the drain current I of the second metal-oxide-semiconductor 1303cEqual to second
The source current I of metal-oxide-semiconductor 1303z, i.e. Ic-Iz, againThereforeI.e.Also
It is to say reference voltage signalControl the drain current of the second metal-oxide-semiconductor 1303When the conducting of the supply line of LED light 140
When, the drain electrode of drain electrode and source electrode and the second metal-oxide-semiconductor 1303 due to the first metal-oxide-semiconductor 1201 and source series are in LED light 140
Supply line, when supply line is connected, the drain current of the second metal-oxide-semiconductor 1303The electric current of LED light 140 is as flowed through,
Thus, it can be understood that reference voltage signalControl flows through the electric current of LED light 140.Illustratively, when increase reference voltage
SignalThe drain current I of second metal-oxide-semiconductor 1303dJust corresponding to increase, when supply line is connected, flow through the electric current of LED lamps 140
Also corresponding to increase.
The pwm signal of duty ratio diminution is modulated by control module 110, and then the first metal-oxide-semiconductor 1201 is according to pwm signal
The turn-on time of the supply line of LED light 140 is shortened, and voltage controlled current source according to the above configuration exports increased electric current letter
Number so that when the supply line of LED light 140 is in the conduction state, the electric current for flowing through LED light 140 increases.To realize
The root mean square that the electric current of LED light 140 is flowed through before and after adjustment is constant, while shortening the turn-on time of LED light 140.Also it just realizes
Do not influence 140 brightness of LED light while, improve the persistence of vision.
It should be noted that no matter LED light 140 supply line is in the conduction state or off-state, above-mentioned second
Metal-oxide-semiconductor 1303 is in conducting state.
The technical solution of the present embodiment modulates the pwm signal of duty ratio diminution by control module, and then break-make controls
Module shortens the turn-on time of the supply line of LED light according to pwm signal, and adjusts module output according to current amplitude and increase
Current signal so that when the supply line of LED light is in the conduction state, flow through LED light electric current increase, to realize
The root mean square for the electric current for flowing through LED light in unit period after before adjustment is constant, while shortening the turn-on time of LED light, real
Show how while not influencing the brightness of LED light, has improved the persistence of vision, improve the viewing experience of user.
Further, based on the above technical solution, the first metal-oxide-semiconductor 1201 and the second metal-oxide-semiconductor 1303 are IRF640
Type field-effect tube.
Further, based on the above technical solution, 1301 OP07 type operational amplifiers of operational amplifier.
Embodiment three
The utility model embodiment three provides a kind of backlight module, and the present embodiment is applicable to improve user's persistence of vision
Situation, the backlight module include the LED light bar as described in above-described embodiment, can also include：Diffusion barrier, brightness enhancement film, light guide plate
Optical film layers such as (if side entrance back modules).The light sent out from LED light bar passes through the adjusting of an excessively a optical film layer, from the back of the body
Uniform emission comes out in optical mode group.
The technical solution of the present embodiment, by the regulation and control to LED light bar, to realize in rear unit period before adjustment
The root mean square for flowing through the electric current of LED light is constant, while shortening the turn-on time of LED light, and is imitated regulation and control by backlight module
Fruit shows, and realizes how while not influencing the brightness of LED light, improves the persistence of vision, improves the picture of user
Experience.
Example IV
The utility model embodiment four provides a kind of liquid crystal display die set, and it is temporary that the present embodiment is applicable to improvement user's vision
The case where staying, the backlight module include the backlight module as described in above-described embodiment, can also include：Liquid crystal cell.From LED light bar
The light sent out is by the adjusting of excessively a optical film layer, and uniform emission comes out from liquid crystal display die set.
The technical solution of the present embodiment, by the regulation and control to LED light bar, to realize in rear unit period before adjustment
The root mean square for flowing through the electric current of LED light is constant, while shortening the turn-on time of LED light, and carries out picture by liquid crystal module
It has been shown that, realizes how while not influencing the brightness of LED light, improves the persistence of vision, improves the viewing experience of user.
Embodiment five
The utility model embodiment five provides a kind of terminal device, which includes described in the utility model embodiment
Liquid crystal display die set.
Illustratively, in specific embodiment of the utility model, terminal device can be LCD TV, laptop with
And tablet computer etc. is equipped with the equipment of liquid crystal display die set.
The technical solution of the present embodiment is realized and is being adjusted by using the liquid crystal display die set for including backlight module above
The root mean square for the electric current for flowing through LED light in whole front and back unit period is constant, while shortening the turn-on time of LED light, realizes
How while not influencing the brightness of LED light, improves the persistence of vision, improve the viewing experience of user.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, can carry out for a person skilled in the art various bright
Aobvious variation is readjusted and is substituted without departing from the scope of protection of the utility model.Therefore, although passing through above example
The utility model is described in further detail, but the utility model is not limited only to above example, is not departing from
Can also include other more equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Right determine.
Claims (10)
1. a kind of LED light bar, which is characterized in that including：Control module, break-make control module, current amplitude adjustment module and LED
Lamp, wherein：
First output end of the control module is electrically connected with the input terminal of the break-make control module, is accounted for for modulating setting
The pwm signal of empty ratio is sent to the break-make control module；The second output terminal of the control module and the current amplitude tune
The input terminal of mould preparation block is electrically connected, for sending reference voltage signal to current amplitude adjustment module；
The break-make control module is connected with the LED light, the supply lines for controlling the LED light according to the pwm signal
Road is turned on or off；
The current amplitude adjustment module is connected with the LED light, for generating current signal according to the reference voltage signal
And the amplitude of the current signal is adjusted based on the reference voltage signal；
The LED light is used as light source for shining when the supply line is connected；
Wherein, the root mean square that the electric current of the LED light is flowed through in unit period remains unchanged.
2. LED light bar according to claim 1, which is characterized in that the break-make control module includes the first metal-oxide-semiconductor；
The grid of first metal-oxide-semiconductor is electrically connected with the first output end of the control module, the source electrode of first metal-oxide-semiconductor and
Drain series are in the supply line of the LED light.
3. LED light bar according to claim 1 or 2, which is characterized in that the current amplitude adjusts module and includes：Operation
Amplifier, first resistor, the second metal-oxide-semiconductor and second resistance；
The noninverting input of the operational amplifier is electrically connected with the second output terminal of the control module；The operational amplifier
Reverse input end be electrically connected with the source electrode of second metal-oxide-semiconductor；The output end of the operational amplifier and the first resistor
One end electrical connection；
The other end of the first resistor is electrically connected with the grid of second metal-oxide-semiconductor；
The drain electrode of second metal-oxide-semiconductor is electrically connected with the source electrode of the first metal-oxide-semiconductor；The source electrode of second metal-oxide-semiconductor and described second
One end of resistance is electrically connected；
The other end of the second resistance is grounded.
4. LED light bar according to claim 2, which is characterized in that one end of the LED light is electrically connected with DC power supply,
The other end is electrically connected with the drain electrode of first metal-oxide-semiconductor.
5. LED light bar according to claim 1, which is characterized in that the number of the LED light is at least two.
6. LED light bar according to claim 3, which is characterized in that first metal-oxide-semiconductor and second metal-oxide-semiconductor are
IRF640 type field-effect tube.
7. LED light bar according to claim 3, which is characterized in that the operational amplifier is OP07 type operational amplifiers.
8. a kind of backlight module, which is characterized in that including claim 1-7 any one of them LED light bars.
9. a kind of liquid crystal display die set, which is characterized in that including backlight module according to any one of claims 8.
10. a kind of terminal device, which is characterized in that including the liquid crystal display die set described in claim 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109741711A (en) * | 2019-03-14 | 2019-05-10 | 武汉精立电子技术有限公司 | A kind of LED backlight adjusting circuit based on high-frequency PWM |
| CN111429852A (en) * | 2020-04-20 | 2020-07-17 | 昆山龙腾光电股份有限公司 | Control circuit and control method of liquid crystal display and display device |
| CN111524479A (en) * | 2020-06-16 | 2020-08-11 | 广州视源电子科技股份有限公司 | Method, device and storage medium for eliminating ghost |
| US11086164B2 (en) * | 2018-09-30 | 2021-08-10 | HKC Corporation Limited | Logic board assembly, display device and liquid crystal display |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11086164B2 (en) * | 2018-09-30 | 2021-08-10 | HKC Corporation Limited | Logic board assembly, display device and liquid crystal display |
| CN109741711A (en) * | 2019-03-14 | 2019-05-10 | 武汉精立电子技术有限公司 | A kind of LED backlight adjusting circuit based on high-frequency PWM |
| CN111429852A (en) * | 2020-04-20 | 2020-07-17 | 昆山龙腾光电股份有限公司 | Control circuit and control method of liquid crystal display and display device |
| CN111429852B (en) * | 2020-04-20 | 2022-04-26 | 昆山龙腾光电股份有限公司 | Control circuit and control method of liquid crystal display and display device |
| CN111524479A (en) * | 2020-06-16 | 2020-08-11 | 广州视源电子科技股份有限公司 | Method, device and storage medium for eliminating ghost |
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