CN103854614B - Backlight control circuit and liquid crystal indicator - Google Patents
Backlight control circuit and liquid crystal indicator Download PDFInfo
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- CN103854614B CN103854614B CN201410062541.7A CN201410062541A CN103854614B CN 103854614 B CN103854614 B CN 103854614B CN 201410062541 A CN201410062541 A CN 201410062541A CN 103854614 B CN103854614 B CN 103854614B
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Abstract
The invention discloses a kind of backlight control circuit and liquid crystal indicator, relating to technical field of liquid crystal display, it is possible to weaken the increase of brightness when POL reverses, thus improving display effect.This backlight control circuit, including backlight driver and the backlight being connected to described backlight driver outfan, also including: be connected to the current control module of described backlight driver, described current control module reduces to the driving electric current of described backlight for controlling the output of described backlight driver in the frame of polarity inversion signal POL reversion.This liquid crystal indicator includes above-mentioned backlight control circuit.
Description
Technical field
The present invention relates to technical field of liquid crystal display, particularly relate to a kind of backlight control circuit and liquid crystal indicator.
Background technology
Along with the development of Display Technique, liquid crystal display (LiquidCrystalDisplay, LCD) is because of advantage more and more welcomed by the peoples such as it is light, Low emissivity.In an lcd, polarity inversion signal (PolarityInversion is called for short POL) is the signal controlling pixel polarity, as shown in Figure 1, polarity inversion signal POL is the cycle under normal circumstances is the square-wave signal of 2 frames, and each pixel is respectively provided with different polarity when POL high level and POL low level.For solving the line image retention problem in LCD, as in figure 2 it is shown, carry out a POL reversion at set intervals, during POL reversion, pixel there will be the situation that two continuous frames is identical polar, and therefore, when POL reverses, brightness can increase suddenly, and human eye can feel flicker.
Summary of the invention
The present invention provides a kind of backlight control circuit and liquid crystal indicator, it is possible to weaken the increase of brightness when POL reverses, thus improving display effect.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that
First aspect, it is provided that a kind of backlight control circuit, including backlight driver and the backlight being connected to described backlight driver outfan, also includes:
Being connected to the current control module of described backlight driver, described current control module reduces to the driving electric current of described backlight for controlling the output of described backlight driver in the frame of polarity inversion signal POL reversion.
In conjunction with first aspect, in the first implementation of first aspect,
Described current control module includes:
First resistance, one end of described first resistance is connected to the electric current of described backlight driver and controls pin, the other end ground connection of described first resistance；
Second resistance unit, one end of described second resistance unit is connected to the electric current of described backlight driver and controls pin, and the other end ground connection of described second resistance unit, described second resistance unit includes the second resistance and the switching tube that are serially connected；
Being connected to the control unit controlling end of described switching tube, described control unit for controlling the cut-off of described switching tube in the frame of polarity inversion signal POL reversion, and the time outside the frame of polarity inversion signal POL reversion controls the conducting of described switching tube.
In conjunction with the first implementation of first aspect, in the second implementation of first aspect, the resistance of described second resistance is 19 times of the resistance of described first resistance.
First or the second implementation in conjunction with first aspect, in the third implementation of first aspect, described control unit includes the POL testing circuit controlling end being connected to described switching tube, described POL testing circuit is used for detecting described polarity inversion signal POL, when the level described polarity inversion signal POL present frame being detected is identical with the level of former frame, described POL testing circuit exports pick-off signal at present frame makes described switching tube end.
First or the second implementation in conjunction with first aspect, in the 4th kind of implementation of first aspect, described control unit includes the timing trigger circuit controlling end being connected to described switching tube, described timing trigger circuit makes described switching tube end for periodically output pick-off signal, the output cycle of described pick-off signal is described polarity inversion signal POL anti-cycle turnover, and the time of described pick-off signal output is a frame.
In conjunction with the 4th kind of implementation of first aspect, in the 5th kind of implementation of first aspect,
Described timing trigger circuit includes:
Crystal oscillating circuit, for producing square-wave signal at described polarity inversion signal POL while producing；
Enumerator, its input is connected to described crystal oscillating circuit, and its outfan is connected to the control end of described switching tube, and described enumerator is for counting according to described square-wave signal, and exporting described pick-off signal when often counting up to x second, the described x second is the cycle of described polarity inversion signal POL.
In conjunction with first aspect, in the 6th kind of implementation of first aspect,
Described current control module includes:
The dividing cell in parallel with described backlight, described dividing cell includes the shunt resistance and the switching tube that are serially connected；
Being connected to the control unit controlling end of described switching tube, described control unit for controlling the conducting of described switching tube in the frame of polarity inversion signal POL reversion, and the time outside the frame of polarity inversion signal POL reversion controls the cut-off of described switching tube.
In conjunction with the 6th kind of implementation of first aspect, in the 7th kind of implementation of first aspect, the resistance of described shunt resistance is 19 times of the internal resistance resistance of described backlight.
The 6th or the 7th kind of implementation in conjunction with first aspect, in the 8th kind of implementation of first aspect, described control unit includes the POL testing circuit controlling end being connected to described switching tube, described POL testing circuit is used for detecting described polarity inversion signal POL, when the level described polarity inversion signal POL present frame being detected is identical with the level of former frame, described POL testing circuit exports Continuity signal at present frame makes described switching tube turn on.
The 6th or the 7th kind of implementation in conjunction with first aspect, in the 9th kind of implementation of first aspect, described control unit includes the timing trigger circuit controlling end being connected to described switching tube, described timing trigger circuit makes described switching tube turn on for periodically output Continuity signal, the output cycle of described Continuity signal is described polarity inversion signal POL anti-cycle turnover, and the time of described Continuity signal output is a frame.
In conjunction with the 9th kind of implementation of first aspect, in the tenth kind of implementation of first aspect,
Described timing trigger circuit includes:
Crystal oscillating circuit, for producing square-wave signal at described polarity inversion signal POL while producing；
Enumerator, its input is connected to described crystal oscillating circuit, and its outfan is connected to the control end of described switching tube, and described enumerator is for counting according to described square-wave signal, and exporting described Continuity signal when often counting up to x second, the described x second is the cycle of described polarity inversion signal POL.
Second aspect, it is provided that a kind of liquid crystal indicator, including above-mentioned backlight control circuit.
Backlight control circuit provided by the invention and liquid crystal indicator, the driving electric current being controlled backlight by backlight control circuit in the polarity inversion signal POL frame reversed is reduced, thus reduce the brightness of backlight when POL reverses, to offset the increase of brightness when POL reverses, effectively reduce owing to when POL reverses, brightness increases the flicker caused, thus improving display effect.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the oscillogram of polarity inversion signal POL under normal circumstances in prior art；
Fig. 2 is oscillogram during prior art Semi-polarity reverse signal POL reversion；
Fig. 3 is the schematic diagram of a kind of backlight control circuit in the embodiment of the present invention one；
Fig. 4 is the oscillogram driving electric current I of the embodiment of the present invention one Semi-polarity reverse signal POL and backlight；
Fig. 5 is the schematic diagram of a kind of backlight control circuit in the embodiment of the present invention two；
Fig. 6 is the schematic diagram of a kind of backlight control circuit in the embodiment of the present invention four；
Fig. 7 is the schematic diagram of a kind of backlight control circuit in the embodiment of the present invention five；
Fig. 8 is the schematic diagram of a kind of backlight control circuit in the embodiment of the present invention seven.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.
Embodiment one
As shown in Figure 3, the embodiment of the present invention provides a kind of backlight control circuit, including backlight driver (Driver) 1 and the backlight 2 being connected to backlight driver 1 outfan, also include: be connected to the current control module 3 of backlight driver 1, in the frame of polarity inversion signal POL reversion, the driving electric current that current control module 3 exports to backlight 2 for controlling backlight driver 1 reduces.
Specifically, as shown in Figure 4, in the frame of polarity inversion signal POL reversion, the level of POL is identical with the level of POL in former frame, the frame of polarity inversion signal POL reversion controls the driving electric current I that backlight driver 1 exports to backlight 2 reduce, thus reducing the brightness of backlight, to offset the increase of brightness when POL reverses.
It should be noted that, above-mentioned backlight 2 can be light emitting diode (Light-EmittingDiode, LED), the various light sources such as Cold Cathode Fluorescent fluorescent tube (ColdCathodeFluorescentLamp, CCFL), electroluminescent lamp (ElectroLuminescence, EL) or electric filament lamp.
Backlight control circuit in the present embodiment, reduce by controlling the driving electric current of backlight in the polarity inversion signal POL frame reversed, thus reduce the brightness of backlight when POL reverses, to offset the increase of brightness when POL reverses, effectively reduce owing to when POL reverses, brightness increases the flicker caused, thus improving display effect.
Embodiment two
As it is shown in figure 5, on the basis of embodiment one, above-mentioned current control module may include that the first resistance R1, one end of the first resistance R1 is connected to the electric current of backlight driver 1 and controls pin, the other end ground connection of the first resistance R1；Second resistance unit 4, one end of the second resistance unit 4 is connected to the electric current of backlight driver 3 and controls pin, and the other end ground connection of the second resistance unit 4, the second resistance unit 4 includes the second resistance R2 and the switching tube M that are serially connected；It is connected to the control unit 5 controlling end of switching tube M, the control unit 5 time control switch pipe M conducting for controlling switching tube M cut-off in the frame of polarity inversion signal POL reversion, outside the frame of polarity inversion signal POL reversion.
The resistance being connected with the electric current of backlight driver 1 control pin is for setting the output electric current of backlight driver 1, and this resistance more big then output electric current is more little.When switching tube M turns on, the first resistance R1 and the second resistance R2 electric current in parallel and with backlight driver 1 controls pin and connects；When switching tube M ends, only the first resistance R1 connects with the electric current control pin of backlight driver 1, and the resistance when resistance of the first resistance R1 is more than the first resistance R1 and the second resistance R2 parallel connection, hence in so that the driving electric current of backlight 2 diminishes.
Specifically, the brightness flop brought during actual test POL reversion is about the 5% of former brightness, owing to the brightness of backlight 2 drives electric current to claim direct ratio with it, if calculating 19 times of the resistance that resistance is the first resistance R1 obtaining the second resistance R2, compared with when the output electric current of backlight driver 1 turns on switching tube M during switching tube M cut-off, reduce 5%.
Backlight control circuit in the present embodiment, reduce by controlling the driving electric current of backlight in the polarity inversion signal POL frame reversed, thus reduce the brightness of backlight when POL reverses, to offset the increase of brightness when POL reverses, effectively reduce owing to when POL reverses, brightness increases the flicker caused, thus improving display effect.
Embodiment three
On the basis of embodiment two, above-mentioned control unit 5 includes the POL testing circuit controlling end being connected to switching tube M, this POL testing circuit is used for detecting above-mentioned polarity inversion signal POL, when the level above-mentioned polarity inversion signal POL present frame being detected is identical with the level of former frame, this POL testing circuit exports pick-off signal at present frame makes switching tube M end.
Specifically, in the frame of POL reversion, the level of POL is identical with the level of former frame, and now POL testing circuit output pick-off signal makes switching tube M end；Time outside the frame of POL reversion, POL testing circuit output Continuity signal makes switching tube M turn on.By the change of polarity inversion signal POL being judged, whether POL reverses, and the driving electric current controlling to export to backlight 2 in the frame of polarity inversion signal POL reversion reduces.
Backlight control circuit in the present embodiment, reduce by controlling the driving electric current of backlight in the polarity inversion signal POL frame reversed, thus reduce the brightness of backlight when POL reverses, to offset the increase of brightness when POL reverses, effectively reduce owing to when POL reverses, brightness increases the flicker caused, thus improving display effect.
Embodiment four
On the basis of embodiment two, control unit 5 includes the timing trigger circuit controlling end being connected to switching tube M, this timing trigger circuit makes switching tube M end for periodically output pick-off signal, the output cycle of this pick-off signal is above-mentioned polarity inversion signal POL anti-cycle turnover, the time of this pick-off signal output is a frame, and the time of output pick-off signal is the frame of POL reversion.By pre-setting polarity inversion signal POL anti-cycle turnover, timing output pick-off signal in the frame of POL reversion makes switching tube M end；Time control switch pipe M conducting outside the frame of POL reversion.
As shown in Figure 6, above-mentioned timing trigger circuit specifically includes: crystal oscillating circuit 51, for producing square-wave signal at above-mentioned polarity inversion signal POL while producing；Enumerator 52, its input is connected to crystal oscillating circuit 51, and its outfan is connected to the control end of switching tube M, and enumerator 52 is for counting according to above-mentioned square-wave signal, and exporting above-mentioned pick-off signal when often counting up to x second, the x second is the cycle of above-mentioned polarity inversion signal POL.
Such as, first in advance above-mentioned polarity inversion signal POL b anti-cycle turnover is set in enumerator 52, when the time schedule controller (T-con) in crystal oscillating circuit 51 and array base palte after start starts simultaneously at work, T-con is the polarity inversion signal POL of x second deenergized period, crystal oscillating circuit 51 is the square-wave signal of 1/60 second deenergized period, enumerator 52 starts counting up when receiving square-wave signal, often count 60x crystal oscillator week after date (i.e. x second) output medium signal to the control end of switching tube M.
Backlight control circuit in the present embodiment, reduce by controlling the driving electric current of backlight in the polarity inversion signal POL frame reversed, thus reduce the brightness of backlight when POL reverses, to offset the increase of brightness when POL reverses, effectively reduce owing to when POL reverses, brightness increases the flicker caused, thus improving display effect.
Embodiment five
As it is shown in fig. 7, on the basis of embodiment one, above-mentioned current control module may include that the dividing cell 6 in parallel with backlight 2, dividing cell 6 includes the shunt resistance R and the switching tube M that are serially connected；It is connected to the control unit 5 controlling end of switching tube M, the control unit 5 time control switch pipe M cut-off for controlling switching tube M conducting in the frame of polarity inversion signal POL reversion, outside the frame of polarity inversion signal POL reversion.
When switching tube M ends, the output electric current of backlight driver 1 is directly output to backlight 2；When switching tube M turns on, backlight driver 1 exports the portion of electrical current in electric current and is split to shunt resistance R, reduces and exports the driving electric current to backlight 2, thus reducing the brightness of backlight 2.
Specifically, the brightness flop brought during actual test POL reversion is about the 5% of former brightness, owing to the brightness of backlight 2 drives electric current to claim direct ratio with it, if calculating 19 times of the internal resistance resistance that resistance is backlight 2 obtaining shunt resistance R, compared with when output to the electric current of backlight ends with switching tube M during switching tube M conducting, reduce 5%.
Backlight control circuit in the present embodiment, reduce by controlling the driving electric current of backlight in the polarity inversion signal POL frame reversed, thus reduce the brightness of backlight when POL reverses, to offset the increase of brightness when POL reverses, effectively reduce owing to when POL reverses, brightness increases the flicker caused, thus improving display effect.
Embodiment six
On the basis of embodiment five, above-mentioned control unit 5 includes the POL testing circuit controlling end being connected to switching tube M, this POL testing circuit is used for detecting above-mentioned polarity inversion signal POL, when the level above-mentioned polarity inversion signal POL present frame being detected is identical with the level of former frame, this POL testing circuit exports Continuity signal at present frame makes switching tube M turn on.
Specifically, in the frame of POL reversion, the level of POL is identical with the level of former frame, and now POL testing circuit output Continuity signal makes switching tube M turn on；Time outside the frame of POL reversion, POL testing circuit output pick-off signal makes switching tube M end.By the change of polarity inversion signal POL being judged, whether POL reverses, and the driving electric current controlling to export to backlight in the frame of polarity inversion signal POL reversion reduces.
Backlight control circuit in the present embodiment, reduce by controlling the driving electric current of backlight in the polarity inversion signal POL frame reversed, thus reduce the brightness of backlight when POL reverses, to offset the increase of brightness when POL reverses, effectively reduce owing to when POL reverses, brightness increases the flicker caused, thus improving display effect.
Embodiment seven
On the basis of embodiment five, control unit 5 includes the timing trigger circuit controlling end being connected to switching tube M, this timing trigger circuit makes switching tube M turn on for periodically output Continuity signal, the output cycle of this Continuity signal is above-mentioned polarity inversion signal POL anti-cycle turnover, and the time of this Continuity signal output is a frame.The time exporting this Continuity signal is the frame of POL reversion.By pre-setting polarity inversion signal POL anti-cycle turnover, timing output Continuity signal in the frame of POL reversion makes switching tube M turn on；Time control switch pipe M cut-off outside the frame of POL reversion.
As shown in Figure 8, above-mentioned timing trigger circuit specifically includes: crystal oscillating circuit 51, for producing square-wave signal at above-mentioned polarity inversion signal POL while producing；Enumerator 52, its input is connected to crystal oscillating circuit 51, and its outfan is connected to the control end of switching tube M, and enumerator 52 is for counting according to above-mentioned square-wave signal, and exporting above-mentioned Continuity signal when often counting up to x second, the x second is the cycle of above-mentioned polarity inversion signal POL.
Backlight control circuit in the present embodiment, reduce by controlling the driving electric current of backlight in the polarity inversion signal POL frame reversed, thus reduce the brightness of backlight when POL reverses, to offset the increase of brightness when POL reverses, effectively reduce owing to when POL reverses, brightness increases the flicker caused, thus improving display effect.
Embodiment eight
The present embodiment provides a kind of liquid crystal indicator, including the backlight control circuit in above-mentioned any embodiment.
This liquid crystal indicator is specifically as follows: liquid crystal panel, LCD TV, liquid crystal display, DPF, mobile phone etc..
Liquid crystal indicator in the present embodiment, the driving electric current being controlled backlight by backlight control circuit in the polarity inversion signal POL frame reversed is reduced, thus reduce the brightness of backlight when POL reverses, to offset the increase of brightness when POL reverses, effectively reduce owing to when POL reverses, brightness increases the flicker caused, thus improving display effect.
It should be noted that the switching tube M in the various embodiments described above is specifically as follows metal oxide layer semiconductor field-effect transistor (Metal-Oxide-SemiconductorField-EffectTransistor, MOSFET) or other controlled switching devices.Above-mentioned pick-off signal and Continuity signal are configured with specific reference to different switching tube types.Such as when switching tube is PMOS, pick-off signal is high level, and Continuity signal is low level；When switching tube is NMOS, pick-off signal is low level, and Continuity signal is high level.
The above; being only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; change can be readily occurred in or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with described scope of the claims.
Claims (11)
1. a backlight control circuit, including backlight driver and the backlight being connected to described backlight driver outfan, it is characterized in that, also including: be connected to the current control module of described backlight driver, described current control module reduces to the driving electric current of described backlight for controlling the output of described backlight driver in the frame of polarity inversion signal POL reversion；
Described current control module includes:
First resistance, one end of described first resistance is connected to the electric current of described backlight driver and controls pin, the other end ground connection of described first resistance；
Second resistance unit, one end of described second resistance unit is connected to the electric current of described backlight driver and controls pin, and the other end ground connection of described second resistance unit, described second resistance unit includes the second resistance and the switching tube that are serially connected；
Being connected to the control unit controlling end of described switching tube, described control unit for controlling the cut-off of described switching tube in the frame of polarity inversion signal POL reversion, and the time outside the frame of polarity inversion signal POL reversion controls the conducting of described switching tube.
2. backlight control circuit according to claim 1, it is characterised in that
The resistance of described second resistance is 19 times of the resistance of described first resistance.
3. backlight control circuit according to claim 1 and 2, it is characterised in that
Described control unit includes the POL testing circuit controlling end being connected to described switching tube, described POL testing circuit is used for detecting described polarity inversion signal POL, when the level described polarity inversion signal POL present frame being detected is identical with the level of former frame, described POL testing circuit exports pick-off signal at present frame makes described switching tube end.
4. backlight control circuit according to claim 1 and 2, it is characterised in that
Described control unit includes the timing trigger circuit controlling end being connected to described switching tube, described timing trigger circuit makes described switching tube end for periodically output pick-off signal, the output cycle of described pick-off signal is described polarity inversion signal POL anti-cycle turnover, and the time of described pick-off signal output is a frame.
5. backlight control circuit according to claim 4, it is characterised in that
Described timing trigger circuit includes:
Crystal oscillating circuit, for producing square-wave signal at described polarity inversion signal POL while producing；
Enumerator, its input is connected to described crystal oscillating circuit, and its outfan is connected to the control end of described switching tube, and described enumerator is for counting according to described square-wave signal, and exporting described pick-off signal when often counting up to x second, the described x second is the cycle of described polarity inversion signal POL.
6. a backlight control circuit, including backlight driver and the backlight being connected to described backlight driver outfan, it is characterized in that, also including: be connected to the current control module of described backlight driver, described current control module reduces to the driving electric current of described backlight for controlling the output of described backlight driver in the frame of polarity inversion signal POL reversion；
Described current control module includes:
The dividing cell in parallel with described backlight, described dividing cell includes the shunt resistance and the switching tube that are serially connected；
Being connected to the control unit controlling end of described switching tube, described control unit for controlling the conducting of described switching tube in the frame of polarity inversion signal POL reversion, and the time outside the frame of polarity inversion signal POL reversion controls the cut-off of described switching tube.
7. backlight control circuit according to claim 6, it is characterised in that
The resistance of described shunt resistance is 19 times of the internal resistance resistance of described backlight.
8. the backlight control circuit according to claim 6 or 7, it is characterised in that
Described control unit includes the POL testing circuit controlling end being connected to described switching tube, described POL testing circuit is used for detecting described polarity inversion signal POL, when the level described polarity inversion signal POL present frame being detected is identical with the level of former frame, described POL testing circuit exports Continuity signal at present frame makes described switching tube turn on.
9. the backlight control circuit according to claim 6 or 7, it is characterised in that
Described control unit includes the timing trigger circuit controlling end being connected to described switching tube, described timing trigger circuit makes described switching tube turn on for periodically output Continuity signal, the output cycle of described Continuity signal is described polarity inversion signal POL anti-cycle turnover, and the time of described Continuity signal output is a frame.
10. backlight control circuit according to claim 9, it is characterised in that
Described timing trigger circuit includes:
Crystal oscillating circuit, for producing square-wave signal at described polarity inversion signal POL while producing；
Enumerator, its input is connected to described crystal oscillating circuit, and its outfan is connected to the control end of described switching tube, and described enumerator is for counting according to described square-wave signal, and exporting described Continuity signal when often counting up to x second, the described x second is the cycle of described polarity inversion signal POL.
11. a liquid crystal indicator, it is characterised in that include the backlight control circuit as described in any one in claim 1 to 10.
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| CN201410062541.7A CN103854614B (en) | 2014-02-24 | 2014-02-24 | Backlight control circuit and liquid crystal indicator |
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| CN201410062541.7A CN103854614B (en) | 2014-02-24 | 2014-02-24 | Backlight control circuit and liquid crystal indicator |
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| AU2003250408A1 (en) * | 2002-09-12 | 2004-04-30 | Koninklijke Philips Electronics N.V. | Transflective liquid crystal display with reduced flicker |
| WO2007091365A1 (en) * | 2006-02-06 | 2007-08-16 | Sharp Kabushiki Kaisha | Display device, active matrix substrate, liquid crystal display device and television receiver |
| JP2008268887A (en) * | 2007-03-29 | 2008-11-06 | Nec Lcd Technologies Ltd | Image display system |
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