CN102802298B - Be applied to function circuit and the correlation technique thereof of backlight - Google Patents
Be applied to function circuit and the correlation technique thereof of backlight Download PDFInfo
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- CN102802298B CN102802298B CN201110135699.9A CN201110135699A CN102802298B CN 102802298 B CN102802298 B CN 102802298B CN 201110135699 A CN201110135699 A CN 201110135699A CN 102802298 B CN102802298 B CN 102802298B
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Abstract
Be applied to function circuit and the correlation technique thereof of a backlight, wherein, this function circuit includes multiple current control circuit, multiple switch, a minimum voltage selector, supply voltage generation circuit and a control unit.The plurality of current control circuit respectively by multiple end points to be coupled to multiple light-emitting component; This minimum voltage selector is coupled to the plurality of end points by the plurality of switch respectively, and is used for receiving the magnitude of voltage from end points at least partially in the plurality of end points, and from wherein selecting a minimum amount of voltage that; This supply voltage produces circuit according to this minimum amount of voltage that to produce a supply voltage of the plurality of light-emitting component; Whether this control unit there is open circuit according to the plurality of light-emitting component, to determine the plurality of switch that is turned on or off.
Description
Technical field
The present invention relates to a kind of function circuit being applied to a backlight, espespecially a kind of function circuit being applied to back light source in LED.
Background technology
Please refer to Fig. 1, Fig. 1 is the schematic diagram of existing backlight module control system 100.As shown in Figure 1, backlight module control system 100 includes multiple light-emitting diode string 110_1 ~ 110_4, multiple current control circuit 120_1 ~ 120_4, minimum voltage selector 130 and a booster circuit 140, wherein each light-emitting diode string 110_1 ~ 110_4 includes multiple light-emitting diode, and each current control circuit 120_1 ~ 120_4 includes an amplifier 122_1 ~ 122_4, a transistor M1 ~ M4 and a resistance R respectively.
The difference on processing procedure is all there is between every light-emitting diode, therefore light-emitting diode string 110_1 ~ 110_4 can have different cross-pressures when operating, all can have enough cross-pressures in order to ensure each light-emitting diode string 110_1 ~ 110_4 when operating, existing backlight module control system 100 can with the magnitude of voltage V of minimum voltage selector 130 on node N1 ~ N4
dET1~ V
dET4middle selection one minimum amount of voltage that, booster circuit 140 again according to this minimum amount of voltage that to determine the voltage level of the supply voltage Vo of light-emitting diode string 110_1 ~ 110_4.In other words, in backlight module control system 100 meeting foundation light-emitting diode string 110_1 ~ 110_4, the supply voltage Vo of that decision light-emitting diode string 110_1 ~ 110_4 that comes that cross-pressure is maximum, all can have enough cross-pressures to come to operate normally to make each light-emitting diode string 110_1 ~ 110_4.
But, according to above-mentioned mechanism, if there is arbitrary road the situation of open circuit (open) to occur, the V corresponding to Ze Gai road in light-emitting diode string 110_1 ~ 110_4
dETvoltage will be 0 forever, the V that now booster circuit 140 meeting export because of minimum voltage selector 130
mINbe 0 and raise supply voltage Vo always; the voltage level of supply voltage Vo finally can be caused too high and overvoltage protection (overvoltageprotection) mechanism is started; and then close the operation of whole backlight module control system 100, cause the failure of controlling mechanism.
Summary of the invention
Therefore, an object of the present invention is to provide a kind of function circuit being applied to a backlight, and it can solve the problem causing controlling mechanism failure because of light-emitting diode open circuit.
According to one embodiment of the invention, a kind of function circuit being applied to a backlight includes multiple current control circuit, multiple switch, a minimum voltage selector, supply voltage generation circuit and a control unit.The plurality of current control circuit respectively by multiple end points to be coupled to multiple light-emitting component; This minimum voltage selector is coupled to the plurality of end points by the plurality of switch respectively, and is used for receiving the magnitude of voltage from end points at least partially in the plurality of end points, and from wherein selecting a minimum amount of voltage that; This supply voltage produces circuit according to this minimum amount of voltage that to produce a supply voltage of the plurality of light-emitting component; Whether this control unit there is open circuit according to the plurality of light-emitting component, to determine the plurality of switch that is turned on or off.
According to another embodiment of the present invention, a kind of method of operation being applied to a backlight, this backlight includes multiple light-emitting component, each light-emitting component includes at least one luminescence unit, this method of operation includes: provide multiple current control circuit, respectively by multiple end points to be coupled to the plurality of light-emitting component; Multiple switch is provided, is respectively coupled to the plurality of end points; One supply voltage is boosted to the cross-pressure be greater than needed for the plurality of light-emitting component; Judge in the plurality of light-emitting component, whether have light-emitting component to produce open circuit, and determine the conducting state of the plurality of switch according to this; Reception is the magnitude of voltage in multiple end points of conducting state from switch, and from wherein selecting a minimum amount of voltage that; According to this minimum amount of voltage that to adjust a supply voltage of the plurality of light-emitting component.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of existing backlight module control system;
Fig. 2 is the schematic diagram being applied to the function circuit of a backlight according to one embodiment of the invention; And
Fig. 3 is a kind of flow chart being applied to the method for operation of a backlight according to one embodiment of the invention.
Main element symbol description
100 backlight module control systems
110_1 ~ 110_4,210_1 ~ 210_k light-emitting diode string
120_1 ~ 120_4,220_1 ~ 220_k current control circuit
122_1 ~ 122_4,222_1 ~ 222_k amplifier
130,250 minimum voltage selector 140,260 booster circuits
200 function circuit 230 control units
232 first comparator 240_1 ~ 240_k second comparators
M1 ~ Mk transistor R, R
1, R
2resistance
SW1 ~ SWk switch 300 ~ 310 step
Embodiment
Please refer to Fig. 2, Fig. 2 is the schematic diagram of the function circuit 200 being applied to a backlight according to one embodiment of the invention, wherein this backlight includes multiple light-emitting component, and each light-emitting component includes at least one luminescence unit, in the present embodiment, each luminescence unit is a light-emitting diode, and these light-emitting components are light-emitting diode string 210_1 ~ 210_k.As shown in Figure 2, function circuit 200 includes multiple current control circuit 220_1 ~ 220_k, two resistance R
1with R
2, one control unit 230, multiple interrupteur SW 1 ~ SWk, one minimum voltage selector 250 and a supply voltage produce circuit, in the present embodiment, supply voltage produces circuit system and realizes with booster circuit 260, wherein, current control circuit 220_1 ~ 220_k is couple to light-emitting diode string 210_1 ~ 210_k via end points N1 ~ Nk respectively, each current control circuit 220_1 ~ 220_4 includes amplifier 222_1 ~ 222_k respectively, an one transistor M1 ~ Mk and resistance R, and control unit 230 includes one first comparator 232 and multiple second comparator 240_1 ~ 240_k.
The supply voltage Vo of resistance R1 and R2 dividing potential drop light-emitting diode string 210_1 ~ 210_k, produce partial pressure value Vo_div, the first comparator 232 is by partial pressure value Vo_div and one first reference value V
ref1compare, to produce a comparison signal ENX, the first reference value V
ref1setting can total cross-pressure value of light-emitting diode string 210_1 ~ 210_k of providing of frame of reference factory, in a preferred embodiment, by the first reference value V
ref1setting a little less than the total cross-pressure value of this after R1, R2 dividing potential drop.Under this setting, when partial pressure value Vo_div is greater than the first reference value V
ref1represent that supply voltage Vo has been greater than the cross-pressure lighted needed for light-emitting diode string 210_1 ~ 210_k, every road light-emitting diode string has enough cross-pressures and can normal running, and the comparison signal ENX that now the first comparator 232 exports is " 1 ", enable second comparator 240_1 ~ 240_k; Otherwise, if partial pressure value Vo_div is not greater than the first reference value V
ref1, represent that light-emitting diode string 210_1 ~ 210_k may cannot normal running without enough cross-pressures, now, the comparison signal ENX that the first comparator 232 exports can be " 0 ", not enable second comparator 240_1 ~ 240_k.
When second comparator 240_1 ~ 240_k is enabled, second comparator 240_1 ~ 240_k can to multiple feedback voltage V of comparison amplifier 222_1 ~ 222_k
fB1~ V
fBkwith one second reference value V
ref2compare, to judge whether there is light-emitting diode string generation open circuit in light-emitting diode string 210_1 ~ 210_k, use and produce switch controlling signal EN1 ~ ENk respectively, change the conducting state of interrupteur SW 1 ~ SWk.For example, if light-emitting diode string 210_1 produces open circuit, then the voltage level V of end points N1
dET1and feedback voltage V
fB1capital is 0V, and therefore, the switch controlling signal EN1 that the second comparator 240_1 exports is " 0 ", and interrupteur SW 1 is opened a way (open) and not conducting; If there is not open circuit in light-emitting diode string 210_1, then the voltage level V of its end points N1
dET1with feedback voltage V
fB1capital one is greater than the value of 0V (input endpoint due to amplifier 222_1 is virtual earth (virtualground), therefore feedback voltage V
fB1reference voltage V can be equaled
ref0), now the switch controlling signal EN1 that exports of the second comparator 240_1 is " 1 ", makes interrupteur SW 2 shut (close) and conducting.In a preferred embodiment, by the second reference value V
ref2be set as 1V, by judging feedback voltage V
fB1~ V
fBkvoltage level whether be less than the second reference value V
ref2just can judge which light-emitting diode string 210_1 ~ 210_k has generation open circuit.In other embodiments, can by the second reference value V
ref2be set as between reference voltage V
ref0and the arbitrary value between 0V.
In other embodiments, can by first reference value Vrefl setting a little more than the total cross-pressure value of this after resistance R1, R2 dividing potential drop, in other words, only at the enable second comparator 240_1 ~ 240_k of the boosted rear ability of supply voltage Vo, and in second comparator 240_1 ~ 240_k not enable period, interrupteur SW 1 ~ SWk is maintained the state of conducting; After second comparator 240_1 ~ 240_k is enabled, just remove diverter switch SW1 ~ SWk according to switch controlling signal EN1 ~ ENk.
As previously mentioned, by switch controlling signal EN1 ~ ENk control switch SW1 ~ SWk conducting whether, minimum voltage selector 250 receives from magnitude of voltage V at least partially in end points N1 ~ Nk
dET1~ V
dETkif such as light-emitting diode string 210_1 there occurs open circuit, now switch controlling signal EN1 will be " 0 ", and make interrupteur SW 1 not conducting, therefore minimum voltage selector 250 can not receive magnitude of voltage V
dET1, and other switch controlling signal EN2 ~ ENk that light-emitting diode string 210_2 ~ 210_k of open circuit does not occur is all " 1 ", makes interrupteur SW 2 ~ SWk conducting, therefore minimum voltage selector 250 will receive only magnitude of voltage V
dET2~ V
dETk, be able to selecting properly minimum amount of voltage that V
mINand be supplied to booster circuit 260, thus avoid function circuit 200 that misoperation occurs, correctly carried out the voltage level boosting to adjust supply voltage Vo.
The first reference value V is not more than at the partial pressure value Vo_div of supply voltage Vo
ref1period, such as when function circuit 200 is just unlocked, represent supply voltage Vo and be also less than cross-pressure in light-emitting diode string 210_1 ~ 210_k, light-emitting diode string 210_1 ~ 210_k is also without enough cross-pressures, now interrupteur SW 1 ~ SWk is off state, and minimum voltage selector 250 can not receive any magnitude of voltage V from end points N1 ~ Nk
dET1~ V
dETk, also can not export minimum amount of voltage that V
mIN, now booster circuit 260 also can not receive minimum amount of voltage that V
mIN.In the present embodiment, booster circuit 260 can built-in one rapid pressure mechanism (not shown), not receive minimum amount of voltage that V
mINin time, accelerates to promote supply voltage Vo, until partial pressure value Vo_div is greater than the first reference value V
ref1after, light-emitting diode string open circuit judgment mechanism is activated, and minimum voltage selector 250 starts to provide minimum amount of voltage that V
mIN, now booster circuit 260 is according to this minimum amount of voltage that V
mINadjust supply voltage Vo.
In addition, although in the embodiment shown in Fig. 2, second comparator 240_1 ~ 240_k is respectively for feedback voltage V
fB1~ V
fBkwith the second reference value V
ref2compare, to produce switch controlling signal EN1 ~ ENk respectively.But in another embodiment of the present invention, second comparator 240_1 ~ 240_k also can respectively to the magnitude of voltage V on end points N1 ~ Nk
dET1~ V
dETkwith the second reference value V
ref2compare, to produce switch controlling signal EN1 ~ ENk, the change in these designs all should be under the jurisdiction of category of the present invention.
Please refer to Fig. 3, Fig. 3 is a kind of flow chart being applied to the method for operation of a backlight according to one embodiment of the invention, and wherein this backlight includes multiple light-emitting component, and each light-emitting component includes at least one luminescence unit.Reference the 2nd, 3 figure, flow process is described below:
Step 300: multiple current control circuit is provided, respectively by multiple end points to be coupled to the plurality of light-emitting component.
Step 302: provide multiple switch, is respectively coupled to the plurality of end points.
Step 304 a: supply voltage is boosted to the cross-pressure be greater than needed for the plurality of light-emitting component.
Step 306: judge whether have light-emitting component to produce open circuit in the plurality of light-emitting component, and determine the conducting state of the plurality of switch according to this.
Step 308: receiving from switch is magnitude of voltage in multiple end points of conducting state, and from wherein selecting a minimum amount of voltage that.
Step 310: according to this minimum amount of voltage that to adjust this supply voltage.
Brief summary the present invention, in the function circuit being applied to a backlight in of the present invention and correlation technique, which light-emitting diode string can be detected and have generation open circuit, and do not use the magnitude of voltage corresponding to light-emitting diode string of this generation open circuit when carrying out minimum voltage and selecting, with the supply voltage making function circuit accurately can determine light-emitting diode string.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (8)
1. be applied to a function circuit for a backlight, described backlight includes multiple light-emitting component, and each light-emitting component includes at least one luminescence unit, and described function circuit includes:
Multiple current control circuit, is coupled to described multiple light-emitting component via multiple end points respectively;
Multiple switch, is respectively coupled to described multiple end points;
One minimum voltage selector, is respectively coupled to described multiple switch, is used for receiving the magnitude of voltage from end points at least partially in described multiple end points, and from wherein selecting a minimum amount of voltage that;
One supply voltage produces circuit, is coupled to described minimum voltage selector, according to described minimum amount of voltage that to produce a supply voltage of described multiple light-emitting component; And
One control unit, be coupled to described multiple switch and described supply voltage produces circuit, whether open circuit is there is according to described multiple light-emitting component, to determine to be turned on or off described multiple switch, wherein, described control unit is according to the multiple magnitudes of voltage corresponding to described multiple end points in described supply voltage and described multiple current control circuit, to judge whether described multiple light-emitting component open circuit occurs, described multiple magnitude of voltage is respectively the multiple feedback voltage values in described multiple current control circuit, and wherein, when a partial pressure value of described supply voltage is not more than first reference value, described control unit disconnects described multiple switch, thus make described minimum voltage selector not receive all magnitudes of voltage from described multiple end points.
2. function circuit according to claim 1, wherein, described control unit includes:
Multiple second comparator, respectively by described multiple magnitude of voltage compared with one second reference value, to produce multiple switch controlling signal respectively; And
Whether one first comparator, be greater than described first reference value according to the described partial pressure value of described supply voltage, determines whether enable described multiple second comparator;
Wherein, described multiple switch controlling signal is in order to disconnect or multiple switch described in conducting.
3. function circuit according to claim 1, wherein, each luminescence unit is a light-emitting diode, and each light-emitting component is a light-emitting diode string.
4. be applied to a method of operation for a backlight, described backlight includes multiple light-emitting component, and each light-emitting component includes at least one luminescence unit, and described method of operation includes:
Multiple current control circuit is provided, respectively by multiple end points to be coupled to described multiple light-emitting component;
Multiple switch is provided, is respectively coupled to described multiple end points;
One supply voltage is boosted to the cross-pressure being greater than described multiple light-emitting component;
Judge in described multiple light-emitting component, whether have light-emitting component to produce open circuit, and determine the conducting state of described multiple switch according to this, wherein, according to the multiple magnitudes of voltage corresponding to described multiple end points in described supply voltage and described multiple current control circuit, to judge whether have light-emitting component to produce open circuit in described multiple light-emitting component, described multiple magnitude of voltage is respectively the multiple feedback voltage level in described multiple current control circuit, and wherein, when a partial pressure value of described supply voltage is not more than first reference value, disconnect described multiple switch, do not receive all magnitudes of voltage from described multiple end points,
Reception is the magnitude of voltage in multiple end points of conducting state from switch, and from wherein selecting a minimum amount of voltage that; And
According to described minimum amount of voltage that to adjust a supply voltage of described multiple light-emitting component.
5. method of operation according to claim 4, wherein, judges whether have light-emitting component to produce open circuit in described multiple light-emitting component, and determines that the step of the conducting state of described multiple switch includes according to this:
When the described partial pressure value of described supply voltage is greater than described first reference value, judges in described multiple light-emitting component, whether have light-emitting component to produce open circuit according to described multiple magnitude of voltage, and determine the conducting state of described multiple switch according to this.
6. method of operation according to claim 5, wherein, judges whether have light-emitting component to produce open circuit in described multiple light-emitting component, and determines that the step of the conducting state of described multiple switch includes according to this:
When the described partial pressure value of described supply voltage is greater than described first reference value, when judging to be greater than the second reference value corresponding to an at particular voltage level of a specific endpoints in described multiple magnitude of voltage, the particular switch corresponding to described specific endpoints in described multiple switch is controlled as conducting; And
Receive the magnitude of voltage from end points at least partially in described multiple end points, and from wherein selecting the step of described minimum amount of voltage that to include:
Receiving from described particular switch control is the end-point voltage value of conducting.
7. method of operation according to claim 6, wherein, judges whether have light-emitting component to produce open circuit in described multiple light-emitting component, and determines that the step of the conducting state of described multiple switch includes according to this:
Judge whether the described partial pressure value of described supply voltage is greater than described first reference value, to produce a comparison signal;
Multiple second comparator is provided, wherein, described multiple second comparator determines whether enable according to described comparison signal, and when described comparison signal represents that the described partial pressure value of described supply voltage is when being greater than described first reference value, described multiple second comparator is enabled; And when described comparison signal represents that the described partial pressure value of described supply voltage is when being not more than described first reference value, described multiple second comparator is not enable;
Wherein, when described multiple second comparator is enable, described multiple second comparator is more described multiple magnitude of voltage and described second reference value respectively, to produce multiple switch controlling signal respectively to control described multiple switch.
8. method of operation according to claim 4, wherein, each luminescence unit is a light-emitting diode, and each light-emitting component is a light-emitting diode string.
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| CN201110135699.9A CN102802298B (en) | 2011-05-24 | 2011-05-24 | Be applied to function circuit and the correlation technique thereof of backlight |
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| CN201110135699.9A CN102802298B (en) | 2011-05-24 | 2011-05-24 | Be applied to function circuit and the correlation technique thereof of backlight |
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| CN102802298B true CN102802298B (en) | 2016-01-20 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103247269B (en) * | 2013-05-06 | 2016-02-10 | 深圳市华星光电技术有限公司 | LED backlight and liquid crystal indicator |
| CN104185350B (en) * | 2014-09-12 | 2017-09-15 | 南京矽力杰半导体技术有限公司 | Multipath LED constant current drive circuit and its control method |
| CN112526248B (en) * | 2019-09-19 | 2024-01-19 | 群创光电股份有限公司 | Diagnostic method for light emitting device |
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| US20070188426A1 (en) * | 2006-02-10 | 2007-08-16 | Al-Aid Corporation | LED driver circuit |
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| CN101207958A (en) * | 2006-12-18 | 2008-06-25 | 广鹏科技股份有限公司 | Driving circuit and related driving method for providing feedback control and open-circuit protection |
| CN101719345A (en) * | 2008-10-09 | 2010-06-02 | 立锜科技股份有限公司 | LED display system and control method thereof as well as driver of LED display system and control method thereof |
| CN101854758A (en) * | 2009-04-02 | 2010-10-06 | 华映视讯（吴江）有限公司 | Current balancing circuit and backlight module with same |
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