CN205946251U - Back of body light adjustment circuit and TV set - Google Patents
Back of body light adjustment circuit and TV set Download PDFInfo
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- CN205946251U CN205946251U CN201620733939.3U CN201620733939U CN205946251U CN 205946251 U CN205946251 U CN 205946251U CN 201620733939 U CN201620733939 U CN 201620733939U CN 205946251 U CN205946251 U CN 205946251U
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- outfan
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- adjustment circuit
- switching tube
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Abstract
The utility model discloses a back of body light adjustment circuit and TV set, wherein, back of the body light adjustment circuit includes operational amplifier, voltage reference source, current -limiting unit, sampling unit, switch tube and is used for the analog signal output unit according to its output current size of dimming control signals regulating, the input interconnection of analog signal output unit's output, operational amplifier's inverting input end and current -limiting unit, operational amplifier's non inverting input end is connected with voltage reference source's output, the interconnection of the output of current -limiting unit, the output of switch tube and sampling unit's input, sampling unit's output ground connection, operational amplifier's output is connected with the controlled end of switch tube, and the input of switch tube is connected with LED drive power supply through LED lamp strip. The utility model discloses technical scheme has with low costs, adjust luminance convenient nimble, efficient, noiselessness and the strong characteristics of interference immunity.
Description
Technical field
This utility model is related to technical field of television sets, particularly to a kind of backlight adjustment circuit and television set.
Background technology
LED uses in more and more many LCD colour TVs because having the advantages that life-span length, power and energy saving, driving convenient.Its
In, the driving of LED is divided into exchange to drive and DC driven.Exchange driving converts through AC-DC after referring to AC rectification filtering
Power directly to LED；DC driven refer to AC rectification filtering after through AC-DC conversion obtain one isolation after low-pressure direct
Flow voltage, then give LED through DC-DC change and power.The mode that exchange drives is because of one-stage transfor-mation fewer than the mode of DC driven
There is higher efficiency and lower cost.
The brightness adjustment of TV typically combines the adjustment of LED-backlit brightness and the adjustment of the transmission brightness of telescreen comes
Realize.CCFL (Cold Cathode Fluorescent Lamp, cold cathode fluorescence lamp have been continued to use in the adjustment of LED-backlit brightness
Pipe) backlight mode, use digital PWM light modulation mode.And why CCFL adopts digital PWM dimming mode, be because
Bad for the dimming mode characteristic of its analog current, it is mainly manifested in the following aspects：One is that dimming scope is very narrow；Two is to adjust
The linearity of light is bad；Three is that dimming process can occur Quench, and four is the change that can produce chromaticity coordinates during light modulation.And adopt
The light modulation of PWM count word can bring inefficient, the problems such as drive noise again.
Because LED is a kind of semiconductor light-emitting elements, there is good simulation dimming characteristic, therefore whole employing simulates light modulation
Mode be best.However, having a kind of prejudice it is believed that simulation light modulation can change LED to the simulation light modulation of LED in current industry
Colour temperature, affect final display effect, therefore, in current industry all or digital PWM dim.By analysis, LED
Dimming characteristic is better than CCFL, will not bring too big color coordinate drift, for this reason, we round machine testing, LED is adopted respectively
With digital dimming and simulation light modulation, observe the change of final screen display color coordinates.Laboratory report is as shown in the table:
From experimental result, for LED, using simulation light modulation with using color coordinate drift produced by digital dimming simultaneously
Not too big difference.Therefore, the utility model proposes a kind of adjusted using the backlight that simulation dimming mode adjusts LED-backlit brightness
Circuit.
Utility model content
Main purpose of the present utility model is to provide a kind of backlight adjustment circuit it is intended to improve the effect of backlight adjustment circuit
Rate.
For achieving the above object, the utility model proposes backlight adjustment circuit include operational amplifier, voltage reference
Source, flow-restriction, sampling unit, switching tube and the analogue signal for adjusting its output current size according to dimming control signal
Output unit；The outfan of described analog signal output unit, the inverting input of described operational amplifier and described current limliting list
The input interconnection of unit, the in-phase input end of described operational amplifier is connected with the outfan of described voltage-reference；Described limit
Stream unit outfan, the outfan of described switching tube and described sampling unit input interconnection, described sampling unit defeated
Go out end ground connection；The outfan of described operational amplifier is connected with the controlled end of described switching tube, the input warp of described switching tube
LED lamp bar is connected with LED drive power.
Preferably, described analog signal output unit includes control chip, D/A converter and voltage current adapter；Institute
The input stating control chip is used for inputting dimming control signal, the outfan of described control chip and described D/A converter
Input connects, and the outfan of described D/A converter is connected with the input of described voltage current adapter, described voltage x current
The outfan of transducer is the outfan of described analog signal output unit.
Preferably, described control chip includes controller and memorizer, and the input of described controller is described control core
The input of piece, the data of described controller is transferred end and is connected with described memorizer, and the outfan of described controller is described control
The outfan of coremaking piece.
Preferably, described voltage current adapter is trsanscondutance amplifier；The input of described trsanscondutance amplifier is described electricity
The input of voltage-current converter, the outfan of described trsanscondutance amplifier is the outfan of described voltage current adapter.
Preferably, described flow-restriction includes current-limiting resistance；The first end of described current resistor is described flow-restriction
Input, the second end of described current-limiting resistance is the outfan of described flow-restriction.
Preferably, described sampling unit includes sampling resistor；The first end of described sampling resistor is described sampling unit
Input, the second end of described sampling resistor are the outfan of described sampling unit.
Preferably, described switching tube is managed for N-MOS；The drain electrode of described N-MOS pipe is the input of described switching tube, described
The source electrode of N-MOS pipe is the outfan of described switching tube, and the grid of described N-MOS pipe is the controlled end of described switching tube.
This utility model also proposes a kind of television set, and this television set includes backlight adjustment circuit as above, the described back of the body
Light adjustment circuit includes operational amplifier, voltage-reference, flow-restriction, sampling unit, switching tube and is used for according to light modulation control
Signal processed adjusts the analog signal output unit of its output current size；The outfan of described analog signal output unit, described
The input interconnection of the inverting input of operational amplifier and described flow-restriction, the in-phase input end of described operational amplifier
It is connected with the outfan of described voltage-reference；The outfan of described flow-restriction, the outfan of described switching tube and described adopt
The input interconnection of sample unit, the output head grounding of described sampling unit；The outfan of described operational amplifier and described switch
The controlled end of pipe connects, and the input of described switching tube is connected with LED drive power through LED lamp bar.
Technical solutions of the utility model are by adjusting its output using analog signal output unit according to dimming control signal
The size of electric current, thus adjustment flows through the size of current of flow-restriction and sampling unit.Due to LED lamp bar, switching tube and sampling
Unit is connected in series, and when the size of current flowing through sampling unit changes, the size of current flowing through LED lamp bar occurs therewith
Change, therefore, technical solutions of the utility model can adjust backlight illumination, reached and adjusted LED by simulating dimming mode
The purpose of backlight illumination.
Additionally, with respect to prior art, technical solutions of the utility model have the advantages that：
(1) adjust LED-backlit brightness so that the size of current flowing through LED lamp bar is by way of using simulation light modulation
Continually varying, rather than saltus step, therefore, technical solutions of the utility model are prevented from noise and are mixed into.
(2) adjust LED-backlit brightness by way of using simulation light modulation so that the electric current flowing through LED lamp bar is to continue
, rather than ended after high current, therefore, technical solutions of the utility model can reduce the power supply damage that high current is brought. again
Consumption, thus improve power-efficient.
(3) due to can realize the control work(of above-mentioned control chip using Master control chip existing on TV SKD
Can, therefore, technical solutions of the utility model can reduce the cost of backlight adjustment circuit.
(4) due to above-mentioned control chip output voltage swing can use software control, therefore, the utility model proposes
Backlight adjustment circuit can neatly adjust LED-backlit brightness.
(5) adjust LED-backlit brightness by injecting analog current signal to above-mentioned flow-restriction and sampling unit.Due to
The anti-interference of current signal is stronger, therefore, the utility model proposes backlight adjustment circuit there is the spy of strong interference immunity
Point.
(6) adjust LED-backlit brightness by injecting analog current signal to above-mentioned flow-restriction and sampling unit.Due to
The anti-interference of current signal is stronger, therefore, the utility model proposes backlight adjustment circuit can be in control section and drive
Use in the dynamic device being partially separated.
Brief description
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to enforcement
Example or description of the prior art in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description are only
It is only some embodiments of the present utility model, for those of ordinary skill in the art, before not paying creative work
Put, other accompanying drawings can also be obtained according to the structure shown in these accompanying drawings.
Fig. 1 is the electrical block diagram of this utility model backlight adjustment circuit one embodiment.
Drawing reference numeral explanation：
| Label | Title | Label | Title |
| 10 | Analog signal output unit | 200 | D/A converter |
| 20 | Flow-restriction | 300 | Voltage current adapter |
| 30 | Sampling unit | 400 | Controller |
| 100 | Control chip | 500 | Memorizer |
| VREF | Voltage-reference | K | Trsanscondutance amplifier |
| Q | Switching tube | U | Operational amplifier |
| R1 | Current-limiting resistance | RS | Sampling resistor |
The realization of this utility model purpose, functional characteristics and advantage will be described further in conjunction with the embodiments referring to the drawings.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely describe it is clear that described embodiment is only a part of embodiment of the present utility model, rather than all
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, broadly falls into the scope of this utility model protection.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute in this utility model embodiment
It is only used for explaining the relative position relation between each part, motion conditions etc. under a certain particular pose (as shown in drawings), such as
When really this particular pose changes, then directionality instruction also correspondingly changes therewith.
In addition, the description being related to " first ", " second " etc. in this utility model is only used for describing purpose, and it is not understood that
For indicating or implying its relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " the
One ", the feature of " second " can be expressed or implicitly include at least one this feature.In addition, the skill between each embodiment
Art scheme can be combined with each other, but must be capable of by those of ordinary skill in the art based on, when technical scheme
In conjunction with occurring conflicting or will be understood that the combination of this technical scheme does not exist when cannot realize, also not in this utility model
Within the protection domain requiring.
The utility model proposes a kind of backlight adjustment circuit.
As shown in figure 1, in one embodiment, this backlight adjustment circuit include operational amplifier U, voltage-reference VREF,
Flow-restriction 20, sampling unit 30, switching tube Q and the mould for adjusting its output current size according to dimming control signal DIM
Intend signal output unit 10；The outfan of analog signal output unit 10, the inverting input of operational amplifier U and flow-restriction
20 input interconnection, the in-phase input end of operational amplifier U is connected with the outfan of voltage-reference VREF；Flow-restriction 20
Outfan, the outfan of switching tube Q and sampling unit 30 input interconnection, the output head grounding GND of sampling unit 30；Fortune
The outfan calculating amplifier U is connected with the controlled end of switching tube Q, and the input of switching tube Q is through LED lamp bar and LED drive power
VI connects.
It should be noted that in the present embodiment, the equivalent resistance of flow-restriction 20 is R1, the equivalent resistance of sampling unit 30
For RS, the voltage swing of voltage-reference VREF is VREF.When the input of analog signal output unit has dimming control signal
During DIM input, analog signal output unit 10 output size analog current signal corresponding with current dimming control signal DIM.
Now it is assumed that the size of current of analog signal output unit 10 output is I, then the electric current IS size flowing through sampling unit 30 is IS
=(VREF-I × R1)/RS.
Because the voltage of the equivalent resistance, the equivalent resistance of sampling unit 30 and voltage-reference VREF of flow-restriction 20 is big
Little it is definite value, therefore, by changing the size of current of analog signal output unit 10 output it is possible to change that to flow through sampling single
The electric current IS size of unit 30.Again because sampling unit 30 and LED lamp bar are connected in series, therefore, flowing through sampling unit 30
Size of current when changing, the size of current flowing through LED lamp bar also can change therewith, so, has just reached light modulation
Purpose.
Be worth mentioning when, in the present embodiment, have dimming control signal DIM in the input of analog signal output unit 10
During input, switching tube Q is always maintained at opening.
Technical solutions of the utility model are by adjusting it using analog signal output unit 10 according to dimming control signal DIM
The size of output current, thus adjustment flows through flow-restriction 20 and the size of current of sampling unit 30.Due to LED lamp bar, switch
Pipe Q and sampling unit 30 are connected in series, and when the size of current flowing through sampling unit 30 changes, flow through the electricity of LED lamp bar
Stream size also changes therewith, and therefore, technical solutions of the utility model can adjust backlight illumination, reached and adjusted by simulation
Light mode adjusts the purpose of LED-backlit brightness.
In a preferred embodiment, analog signal output unit 10 includes control chip 100, D/A converter 200 and voltage
Current converter 300；The input of control chip 100 is used for inputting dimming control signal DIM, the outfan of control chip 100
It is connected with the input of D/A converter 200, the outfan of D/A converter 200 is connected with the input of voltage current adapter 300
Connect, the outfan of voltage current adapter 300 is the outfan of analog signal output unit 10.
When the input of control chip 100 has dimming control signal DIM input, control chip 100 output is adjusted with current
The corresponding digital voltage signal of optical control signal DIM size.Digital voltage signal is converted to analog voltage by D/A converter 200
Signal, analog voltage signal is converted to analog current signal and exports by voltage current adapter 300.
It is understood that in the present embodiment, no matter the dimming control signal DIM of input is analogue signal or numeral letter
Number, the current signal that control chip 100 can generate simulation light modulation is injected into above-mentioned flow-restriction 20 and sampling unit 30 reality
The now simulation brightness adjustment control to LED.
It is noted that in one embodiment, it is (not shown that analog signal output unit 10 can include adjustable resistance
Go out) and voltage current adapter 300, the adjustment end of adjustable resistance is the input of analog signal output unit 10, adjustable resistance
Outfan be connected with the input of voltage current adapter 300, the outfan of voltage current adapter 300 is that analogue signal is defeated
Go out the outfan of unit 10, the input of adjustable resistance is used for input analog voltage signal.Adjust in the brightness to LED lamp bar
In whole process, the resistance of adjustable resistance can be controlled corresponding with dimming control signal DIM, so that in dimming control signal DIM
When changing, the size of current flowing through LED lamp bar changes with the change of dimming control signal DIM, reaches the mesh of light modulation
's.
Although the embodiment of above-mentioned analog signal output unit 10 can reach the purpose of light modulation, compared to adjustable electric
Resistance, the adjusting range of the simulation dim signal being generated by control chip 100 is wider, and output is more accurate.
Preferably, above-mentioned control chip 100 includes controller 400 and memorizer 500, and the input of controller 400 is control
The input of coremaking piece 100, the data of controller 400 is transferred end and is connected with memorizer 500, and the outfan of controller 400 is control
The outfan of coremaking piece 100.Specifically, when the input of controller 400 has dimming control signal DIM input, controller
400 transfer out the size magnitude of voltage corresponding with current dimming control signal DIM from memorizer 500, and defeated in its outfan
Go out.
Preferably, above-mentioned voltage current adapter 300 is trsanscondutance amplifier K；The input of trsanscondutance amplifier K is voltage electricity
The input of stream transformer 300, the outfan of trsanscondutance amplifier K is the outfan of voltage current adapter 300.When mutual conductance is amplified
When the input of device K has analog voltage signal input, analog voltage signal is converted to analog current signal by trsanscondutance amplifier K,
And export after being amplified processing by analog current signal.
Preferably, above-mentioned flow-restriction 20 includes current-limiting resistance R1；The first end of current-limiting resistance R1 is flow-restriction 20
Input, second end of current-limiting resistance R1 is the outfan of flow-restriction 20；Wherein, the size of this current-limiting resistance R1 is R1.When
So, flow-restriction 20 can also include the other structures such as the resistor matrix that is made up of multiple resistance, be not limited herein.Using one
When individual current-limiting resistance R1 is as flow-restriction 20, circuit structure is fairly simple.
Preferably, above-mentioned sampling unit 30 includes sampling resistor RS；The first end of sampling resistor RS is sampling unit 30
Input, second end of sampling resistor RS are the outfan of sampling unit 20；Wherein, the size of this sampling resistor RS is RS.When
So, sampling unit 30 can also include the other structures such as the resistor matrix that is made up of multiple resistance, be not limited herein.Using one
When individual sampling resistor RS is as sampling unit 30, circuit structure is fairly simple.
Preferably, above-mentioned switching tube Q manages for N-MOS；The drain electrode of N-MOS pipe is the input of switching tube Q, N-MOS pipe
Source electrode is the outfan of switching tube Q, and the grid of N-MOS pipe is the controlled end of switching tube Q.Those skilled in the art can also adopt
NPN type triode, as switching tube Q, is not limited herein.
Hereinafter, the operation principle of this utility model backlight adjustment circuit, in conjunction with Fig. 1, is described：
When the input of controller 400 has dimming control signal DIM input, controller 400 is transferred from memorizer 500
Go out the size digital voltage signal corresponding with current dimming control signal DIM, and in the output of its outfan.D/A converter 200
Digital voltage signal is converted to analog voltage signal, analog voltage signal is converted to analog current signal by trsanscondutance amplifier K
And carry out processing and amplifying, to export the analog current signal of suitable size, analog current signal is successively through divider resistance R1 and adopt
Sample resistance RS to ground GND.Now it is assumed that the size of current of trsanscondutance amplifier K output is I, the size of current flowing through LED lamp bar is
IS, then have IS=(VREF-I × R1)/RS.So, when dimming control signal DIM changes, the electric current of trsanscondutance amplifier K output
Size changes, and the size of current flowing through LED lamp bar changes, and has reached the purpose to LED light modulation.
This utility model also proposes a kind of television set, and this television set includes backlight adjustment circuit as above, this backlight
Concrete structure reference above-described embodiment of adjustment circuit, because this television set employs whole technical sides of above-mentioned all embodiments
Case, therefore at least has all beneficial effects that the technical scheme of above-described embodiment is brought, this is no longer going to repeat them.
The foregoing is only preferred embodiment of the present utility model, not thereby limit the scope of the claims of the present utility model,
Every equivalent structure change under inventive concept of the present utility model, made using this utility model description and accompanying drawing content
Change, or directly/be indirectly used in other related technical fields and be included in scope of patent protection of the present utility model.
Claims (8)
1. a kind of backlight adjustment circuit is it is characterised in that include operational amplifier, voltage-reference, flow-restriction, sampling list
Unit, switching tube and the analog signal output unit for adjusting its output current size according to dimming control signal；Described simulation
The input interconnection of the outfan of signal output unit, the inverting input of described operational amplifier and described flow-restriction, institute
The in-phase input end stating operational amplifier is connected with the outfan of described voltage-reference；The outfan of described flow-restriction, institute
State the outfan of switching tube and the input interconnection of described sampling unit, the output head grounding of described sampling unit；Described computing
The outfan of amplifier is connected with the controlled end of described switching tube, and the input of described switching tube drives electricity through LED lamp bar with LED
Source connects.
2. backlight adjustment circuit as claimed in claim 1 is it is characterised in that described analog signal output unit includes controlling core
Piece, D/A converter and voltage current adapter；The input of described control chip is used for inputting dimming control signal, described control
The outfan of coremaking piece is connected with the input of described D/A converter, the outfan of described D/A converter and described voltage x current
The input of transducer connects, and the outfan of described voltage current adapter is the outfan of described analog signal output unit.
3. backlight adjustment circuit as claimed in claim 2 is it is characterised in that described control chip includes controller and storage
Device, the input of described controller is the input of described control chip, and the data of described controller transfers end and described storage
Device connects, and the outfan of described controller is the outfan of described control chip.
4. backlight adjustment circuit as claimed in claim 2 is it is characterised in that described voltage current adapter amplifies for mutual conductance
Device；The input of described trsanscondutance amplifier is the input of described voltage current adapter, the outfan of described trsanscondutance amplifier
Outfan for described voltage current adapter.
5. backlight adjustment circuit as claimed in claim 1 is it is characterised in that described flow-restriction includes current-limiting resistance；Described
The first end of current resistor is the input of described flow-restriction, and the second end of described current-limiting resistance is the defeated of described flow-restriction
Go out end.
6. backlight adjustment circuit as claimed in claim 1 is it is characterised in that described sampling unit includes sampling resistor；Described
The first end of sampling resistor is the input of described sampling unit, and the second end of described sampling resistor is the defeated of described sampling unit
Go out end.
7. backlight adjustment circuit as claimed in claim 1 is it is characterised in that described switching tube is managed for N-MOS；Described N-MOS
The drain electrode of pipe is the input of described switching tube, and the source electrode of described N-MOS pipe is the outfan of described switching tube, described N-MOS
The grid of pipe is the controlled end of described switching tube.
8. a kind of television set is it is characterised in that include the backlight adjustment circuit as described in claim 1-7 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620733939.3U CN205946251U (en) | 2016-07-12 | 2016-07-12 | Back of body light adjustment circuit and TV set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620733939.3U CN205946251U (en) | 2016-07-12 | 2016-07-12 | Back of body light adjustment circuit and TV set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205946251U true CN205946251U (en) | 2017-02-08 |
Family
ID=57928712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620733939.3U Expired - Fee Related CN205946251U (en) | 2016-07-12 | 2016-07-12 | Back of body light adjustment circuit and TV set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205946251U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107968583A (en) * | 2017-12-20 | 2018-04-27 | 上海贝岭股份有限公司 | Line loss compensation device, integrated circuit and the Switching Power Supply of Switching Power Supply |
| CN110121228A (en) * | 2019-05-06 | 2019-08-13 | 惠州市西顿光电有限公司 | A kind of highly compatible controllable silicon light modulation power circuit |
-
2016
- 2016-07-12 CN CN201620733939.3U patent/CN205946251U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107968583A (en) * | 2017-12-20 | 2018-04-27 | 上海贝岭股份有限公司 | Line loss compensation device, integrated circuit and the Switching Power Supply of Switching Power Supply |
| CN110121228A (en) * | 2019-05-06 | 2019-08-13 | 惠州市西顿光电有限公司 | A kind of highly compatible controllable silicon light modulation power circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170208 |