CN103974492A - Light-emitting device and control method thereof - Google Patents
Light-emitting device and control method thereof Download PDFInfo
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- CN103974492A CN103974492A CN201310039108.7A CN201310039108A CN103974492A CN 103974492 A CN103974492 A CN 103974492A CN 201310039108 A CN201310039108 A CN 201310039108A CN 103974492 A CN103974492 A CN 103974492A
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Abstract
The invention discloses a light-emitting device and a control method thereof. The light-emitting device comprises a light-emitting module which allows for operation of the light-emitting device. The light-emitting module includes a plurality of light-emitting unit stings. Each light-emitting string includes a plurality of light-emitting units connected in series. One end of every light-emitting unit string receives direct-current voltage. Cross-voltage of each current control unit is captured; whether or not the light-emitting units in the light-emitting unit strings fail is judged; each current control unit is connected at least one of the light-emitting unit strings; when the certain number x of the light-emitting units in the specific ones of the light-emitting unit strings fail and x is larger than or equal to a critical failure number p, the direct-current voltage received by each light-emitting unit is down-regulated by shorting the failed light-emitting units in the specific strings and shorting the (x-p+1) light-emitting units in the light-emitting unit strings except the specific strings.
Description
Technical field
This disclosure relates to a kind of light emitting module control technology, and particularly relevant for a kind of light-emitting device and method.
Background technology
No matter be the backlight of display floater or in order to do the light source throwing light on, solid-state light emitting element is as light-emitting diode (light emitting diode; LED) become gradually mainstream technology.In the backlight of for example display floater, light-emitting component is typically designed to the form of module, to provide display floater uniform light source, and the light-emitting component that wherein above-mentioned module comprises series connection.Yet, in above-mentioned module, can run into the situation that light-emitting component breaks down unavoidably.When the light-emitting component situation that wherein one breaks down of series connection, the original pressure drop of the light-emitting component of this fault will be transferred on other elements with string.Therefore,, when the number increase of fault, the pressure drop of transfer raises, and will easily to other elements, cause damage.
For avoiding above-mentioned condition to occur, the mode in the past adopting is that the number in a string light-emitting component fault arrives when a certain amount of, closes the light-emitting component of whole string.But, for the few fault light-emitting component of number possibility, close the light-emitting component of whole string, by the brightness of light source is declined to a great extent, be unfavorable for the benefit of its running.
Therefore, how to design a new light-emitting device and method, with when the light-emitting component fault, have flexible adjustment mechanism, the shortcoming of avoiding making the brightness of light source to decline to a great extent, is an industry problem demanding prompt solution for this reason.
Summary of the invention
The object of the present invention is to provide a kind of light-emitting device and control method thereof, in order to one of to address the above problem at least and or other problems.
Therefore, a mode of this disclosure is that a kind of light-emitting device is being provided, and comprises: light emitting module, a plurality of current control unit and control module.Light emitting module comprises a plurality of luminescence unit strings, and each luminescence unit string comprises a plurality of luminescence units that are in series, and wherein one end of each luminescence unit string receives direct voltage jointly.Current control unit each with luminescence unit string connecting at least wherein, to control the electric current of each luminescence unit string.Control module captures the cross-pressure value of each current control unit, and whether the luminescence unit that further judges each luminescence unit string fault; And break down and when number of defects x is more than or equal to critical fault number p when the luminescence unit of the specific string of luminescence unit string, control module makes the luminescence unit short circuit of fault in specific string and makes (x-p+1) individual luminescence unit short circuit in each luminescence unit string outside specific string, to downgrade the direct voltage of each luminescence unit serial connection receipts, reach the effect of the power consumption that reduces current control unit.
According to this disclosure one embodiment, wherein the number m of luminescence unit string is less than the number n of the luminescence unit that each luminescence unit string comprises.When number (m-1) * (x-p+1) of the luminescence unit of each luminescence unit string institute short circuit outside control module judges specific string is more than or equal in specific string not the number of the luminescence unit of short circuit (n-x), control module is closed specific string.
According to another embodiment of this disclosure, wherein each luminescence unit more comprises light-emitting component and paralleling switch, and control module is by controlling paralleling switch conducting with light-emitting component corresponding to short circuit.
According to the another embodiment of this disclosure, wherein control module stores the short circuit luminescence unit table of comparisons to record in each luminescence unit string at least one luminescence unit of short circuit and short circuit luminescence unit fault whether.Wherein control module, when carrying out the short circuit of specific string, judges whether the normal operation person wherein of luminescence unit in specific string to carry out short circuit, with when to normal operation person's short circuit, this normal operation person is reverted to path.Control module more judges according to the short circuit luminescence unit table of comparisons whether the luminescence unit of specific string has the normal luminescence unit of at least one short circuit, to make the normal luminescence unit of short circuit revert to path when the number k of the normal luminescence unit of short circuit is less than or equal to x, and when being greater than x, k make the individual normal luminescence unit of short circuit of x revert to path.Wherein control module sequentially the specific string of short circuit luminescence unit wherein according to the cross-pressure value of current control unit, judge whether the normal luminescence unit of short circuit to carry out short circuit in the lump.
According to this disclosure embodiment again, wherein during the short circuit of each the luminescence unit string of control module outside carrying out specific string, according to the short circuit luminescence unit table of comparisons, judge whether the luminescence unit of each luminescence unit string outside specific string has short circuit luminescence unit, when luminescence unit have short circuit luminescence unit and the number q of short circuit luminescence unit be more than or equal to (x-p+1), control module is not carried out short circuit, when the number q of the luminescence unit of short circuit of luminescence unit is less than (x-p+1), control module makes the luminescence unit short circuit of (x-p+1-q) individual not short circuit.
An embodiment who has more according to this disclosure, the situation and the fault number that when y luminescence unit string, produce fault are z, and (during (m-1) * (x-p+1)-z)≤((n-x) * y+ (p-1) * (y-1)), control module is closed y luminescence unit string.
The another way of this disclosure is that a kind of light-emitting device control method is being provided, comprise: make the light emitting module running of light-emitting device, wherein light emitting module comprises a plurality of luminescence unit strings, each luminescence unit string comprises a plurality of luminescence units that are in series, and wherein one end of each luminescence unit string receives direct voltage jointly; Capture a plurality of current control units and divide other cross-pressure value, whether the luminescence unit that further judges each luminescence unit string fault, wherein each current control unit and luminescence unit string connecting wherein; And when etc. the luminescence unit of specific string of luminescence unit string break down and when number of defects x is more than or equal to critical fault number p, make the luminescence unit short circuit of fault in specific string and make (x-p+1) individual luminescence unit short circuit in each luminescence unit string outside specific string, the direct voltage of receiving to downgrade each luminescence unit serial connection.
According to this disclosure one embodiment, wherein the number of luminescence unit string is less than the number of the luminescence unit that each luminescence unit string comprises.Light-emitting device control method more comprises when number (m-1) * (x-p+1) of the luminescence unit of each the luminescence unit string institute short circuit of judgement outside specific string is more than or equal in specific string not the number of the luminescence unit of short circuit (n-x), directly closes this specific string.
According to another embodiment of this disclosure, wherein in the step of carrying out the short circuit of specific string, more comprise and judge whether the normal operation person wherein of luminescence unit in specific string to carry out short circuit, with when to normal operation person's short circuit, recover this normal operation person for path.Light-emitting device control method more comprises and judges whether the luminescence unit of specific string has the normal luminescence unit of at least one short circuit, to make the normal luminescence unit of short circuit revert to path when the number k of the normal luminescence unit of short circuit is less than or equal to x, and when being greater than x, k make the individual normal luminescence unit of short circuit of x revert to path.
According to the another embodiment of this disclosure, wherein in the step of carrying out the short circuit of specific string, the luminescence unit that more comprises the specific string of short circuit sequentially wherein according to the cross-pressure value of current control unit, judge whether the normal luminescence unit of short circuit to carry out short circuit in the lump.
According to this disclosure embodiment again, the step of the short circuit of each luminescence unit string outside carrying out specific string wherein, more comprise and judge whether the luminescence unit of each luminescence unit string outside specific string has short circuit luminescence unit, when the number q of short circuit luminescence unit is more than or equal to (x-p+1), do not carry out short circuit, when the number q of short circuit luminescence unit is less than (x-p+1), make this luminescence unit short circuit of (x-p+1-q) individual not short circuit.
An embodiment who has more according to this disclosure, light-emitting device control method more comprises the situation that produces fault when y luminescence unit string, a fault number in each y luminescence unit string is z, and (during (m-1) * (x-p+1)-z)≤((n-x) * y+ (p-1) * (y-1)), close y luminescence unit string.
The advantage of applying this disclosure is by making the luminescence unit short circuit of fault in specific string and making (x-p+1) individual luminescence unit short circuit in each luminescence unit string outside specific string, the shortcoming that causes brightness to decline to a great extent in the time of can avoiding directly closing whole luminescence unit string, and reach easily above-mentioned object.
Accompanying drawing explanation
For above and other object, feature, advantage and the embodiment of this disclosure can be become apparent, appended graphic being described as follows:
Figure 1A is in this disclosure one embodiment, a kind of circuit diagram of light-emitting device;
Figure 1B is in this disclosure one embodiment, the more detailed circuit diagram of light-emitting device;
Fig. 2 is in this disclosure one embodiment, and the luminescence unit string of light emitting module produces the circuit diagram of failure situations;
Fig. 3 is in this disclosure one embodiment, the circuit diagram of two luminescence unit string generation failure situations in light emitting module; And
Fig. 4 is in this disclosure one embodiment, a kind of flow chart of light-emitting device control method.
Wherein, description of reference numerals is as follows:
1: light-emitting device 10: light emitting module
100: luminescence unit 102: light-emitting component
104: paralleling switch 12: control module
14: brightness adjustment control bus 140: current control unit
16: power module 200: fault luminescence unit
210: short circuit luminescence unit 400: light-emitting device control method
401-408: step
Embodiment
Please refer to Figure 1A.Figure 1A is in this disclosure one embodiment, a kind of circuit diagram of light-emitting device 1.Light-emitting device 1 comprises: light emitting module 10, control module 12 and brightness adjustment control bus 14.
Light emitting module 10 comprises a plurality of string luminescence units, in Figure 1A, be with the 1st string, the 2nd string ..., m string list shows.Each luminescence unit string comprises a plurality of luminescence units 100 that are in series.
In the present embodiment, light emitting module 10 comprises m luminescence unit string altogether, has n luminescence unit 100 in each luminescence unit string, to be arranged as the array format of the capable n row of m.Luminescence unit string can be according to galvanoluminescence, and produces uniform light source.In the present embodiment, the number m of luminescence unit string is less than the number n of the luminescence unit 100 that each luminescence unit string comprises.Brightness adjustment control bus 14 can be in order to the electric current of each luminescence unit string is controlled, so that the luminous of luminescence unit string can reach stable.In the present embodiment, light-emitting device 1 more comprises power module 16, to provide power supply luminous to light emitting module 10 being carried out in light emitting module 10.Wherein, one end of each luminescence unit string in light emitting module 10 is connected to power module 16 jointly.
Please refer to Figure 1B.Figure 1B is in this disclosure one embodiment, the more detailed circuit diagram of light-emitting device 1.In the present embodiment, brightness adjustment control bus 14 comprises several current control units 140.Each current control unit 140 and luminescence unit 100 series connection in corresponding luminescence unit string, to control the electric current of the luminescence unit string of flowing through.In the present embodiment, current control unit 140 can be controlled the electric current of luminescence unit string in a definite value, so that the luminous of luminescence unit string can reach stable.
Luminescence unit string wherein one end receives direct voltage Vdc jointly, and the other end is connected to earth terminal GND by current control unit 140.Wherein, direct voltage Vdc can be provided by the power module 16 of Figure 1A.Each luminescence unit 100 in luminescence unit string comprises light-emitting component 102 and paralleling switch 104.Light-emitting component 102 can be solid-state (solid state) light-emitting component.For instance, semiconductor light-emitting-diode (lightemitting diode; LED) and Organic Light Emitting Diode (organic LED; OLED) be solid-state light emitting element.In different embodiment, light-emitting component 102 can adopt different solid-state light emitting elements to realize.Paralleling switch 104 is in parallel with light-emitting component 102.When paralleling switch 104 is closed and light-emitting component 102 not during fault, light-emitting component 102 can normal operation; And when paralleling switch 104 conducting, light-emitting component 102 be positioned at the normal or state of fault all will be by short circuit.
In an embodiment, control module 12 can be controlled opening and closing of paralleling switch 104 by brightness adjustment control bus 14.In other embodiment, also can to paralleling switch 104, be controlled by other mode.
Luminescence unit 100 and current control unit 140 are according to the corresponding electric current running of direct voltage Vdc, and therefore, when light emitting module 10 operation, luminescence unit 100 and current control unit 140 all produce pressure drop.In Figure 1B, the pressure drop that each luminescence unit 100 produces is to represent with Vy (a, b), and wherein a and b represent that this luminescence unit 100 is arranged in the position of light emitting module 10 arrays.For instance, be positioned at the pressure drop that the luminescence unit 100 of the 1st row the 1st row (the 1st string is the 1st) produces and be Vy (1,1), and be positioned at the pressure drop that luminescence unit 100 that the capable n of m is listed as produces, be Vy (m, n).On the other hand, the pressure drop that current control unit 140 corresponding to the 1st luminescence unit string to the m luminescence unit string produces represents with Vz1～Vzm respectively.
The cross-pressure value of the current control unit 140 of corresponding each luminescence unit strings of control module 12 acquisition, whether the luminescence unit 100 that further judges each luminescence unit string fault.Should be noted, in the fault of this luminescence unit 100, refer to that in fact its light-emitting component 102 produces the situation that cannot operate.Because each luminescence unit string is according to same direct voltage Vdc running, so the overall presure drop of each luminescence unit string is equal.During luminescence unit 100 fault in luminescence unit string, due to normal operation again, its pressure drop originally producing will be transferred on corresponding current control unit 140.Therefore,, by capturing the cross-pressure value (being the pressure drop of current control unit 140) of current control unit 140 and judging whether this cross-pressure value raises, control module 12 can be judged the situation that whether has luminescence unit 100 to produce faults.
For instance, when luminescence unit 100 faults of the 1st row the 2nd row, the cross-pressure value of its corresponding current control unit 140 will become Vz1+Vy (1,2).If while being more than or equal to a critical fault number p with the number x of a string middle luminescence unit 100 faults, will making corresponding current control unit 140 cannot bear too high voltage and damage, and then the luminescence unit string of whole string cannot be operated again.In an embodiment, critical fault number p is 2; This means, when the number with a string middle luminescence unit 100 faults is more than or equal to 2, will make corresponding current control unit 140 damage.
Yet, the number x of fault closes the luminescence unit 100 of whole string while surpassing critical fault number p, easily because the brightness that only the luminescence unit 100 of one or two fault loses whole string luminescence unit 100 will decline to a great extent the luminous efficiency of Integral luminous module 10.For instance, in light emitting module 10, the number m of luminescence unit string is 4, and the number n of the luminescence unit 100 having in each string is 13 o'clock, if wherein the number x of a string fault is 2, this string will make Integral luminous module 10 reduce the brightness of 13 luminescence units 100 because directly close.
Therefore, in the present invention, control module 12 is worked as wherein a string out of order situation of luminescence unit string in judgement, and when number of defects x is more than or equal to critical fault number p, to make luminescence unit 100 short circuits of fault in this string, and make (x-p+1) individual luminescence unit in each luminescence unit string outside this string also with short circuit.
Please refer to Fig. 2.Fig. 2 is in this disclosure one embodiment, and the luminescence unit string of light emitting module 10 produces the circuit diagram of failure situations.
For instance, when control module 12 is in judgement light emitting module 10, the 1st row the 1st row and the 1st row the 2nd row (have Vy (1,1) and Vy (1,2) while pressure drop person) being fault luminescence unit 200, to control the paralleling switch 104 in parallel with light-emitting component 200, with by 100 short circuits of the luminescence unit of fault.In addition, control module 12 further will make the 2nd walk to the capable luminescence unit string of m wherein in the short circuit of (2-2+1=1) luminescence unit.In the present embodiment, control module 12 is that the 2nd luminescence unit 210 short circuits of walking to capable each the 1st row of m (are had to Vy (2,1) ... Vy (m, 1) pressure drop person).Should be noted that the above-mentioned short circuit that luminescence unit is carried out all can refer to control its inner paralleling switch 104 conductings so that light-emitting component 102 is carried out to short circuit by control module 12.
Therefore,, except the 1st string has two luminescence units 100 cannot operate, other each strings all have a luminescence unit 100 not operated by short circuit.The element that can current sinking produces pressure drop due to every string reduces, therefore control module 12 can further be adjusted direct voltage Vdc, so that direct voltage Vdc declines and do not cause the element in each luminescence unit string to be damaged, and still can make respectively to go here and there luminescence unit 100 regular events.
Therefore, as to take the number m of luminescence unit string be 4, and the situation that in each string, luminescence unit 100 number n are 13 is example, while processing the situation of luminescence unit 100 faults in mode of the present invention, each luminescence unit in two luminescence units of the 1st string and 2nd～4 strings will only need be closed, the luminescence unit 100 of five altogether, it is compared down with directly closing the situation that whole string luminescence unit 100 causes 13 (comprising fault) luminescence unit 100 cannot operate, the problem that causes light emitting module 10 luminous efficiencies to decline in the time of can significantly improving luminescence unit 100 fault.
In above-mentioned mode, the number damaging as the luminescence unit 100 with in a string is that 3 (x=3) and critical fault number are 2(p=2), control module 12 is except by 3 luminescence unit short circuits of fault, also by two ((x-p+1)=(3-2+1)=2) short circuits in other each luminescence unit strings to outside this string.
Yet, in an embodiment, too much as the number x of control module 12 failure judgement, and when making to close luminescence unit 100 in other strings and not meeting benefit, also can directly close this luminescence unit string.Meaning, as to have in a specific string of fault luminescence unit the not number of the luminescence unit 100 of short circuit be (n-x), under aforementioned mechanism, needing the number of the luminescence unit 100 of short circuit is (m-1) * (x-p+1), as control module 12 judgement (m-1) *, (during x-p+1)≤(n-x), control module 12 will be closed this specific string.
For instance, as being listed as (m=4 at 4 row 13; N=13), in array, wherein a string number of defects is 4(x=4) and critical fault number be 2(p=2), luminescence unit 100 numbers of not short circuit are equivalent to (n-x)=(13-4)=9.As adjusted with above-mentioned mechanism, altogether need to close (m-1) * (x-p+1)=(3) * (4-2+1)=9.Therefore, above-mentioned mechanism is favourable unlike the mode of directly closing this specific string, and now control module 12 can directly be closed this specific string.
If in same array, wherein a string number of defects is 5 (x=5), and luminescence unit 100 numbers of not short circuit are equivalent to (n-x)=(13-5)=8.And as adjusted and altogether need to close (m-1) * (x-p+1)=(3) * (5-2+1)=12 with above-mentioned mechanism.Control module 12 can judge that the mode of closing this specific string closes this specific string compared with meeting benefit.
Please refer to Fig. 3.Fig. 3 is in this disclosure one embodiment, the circuit diagram of two luminescence unit string generation failure situations in light emitting module 10.
In the present embodiment, light emitting module 10 is the array (m=5 of 5 row 13 row; N=13), and critical fault number be 2(p=2).Two luminescence unit strings in light emitting module 10, the 1st string as shown in Figure 2 and the 5th string, reach critical fault number p, and wherein the 5th string has two fault luminescence units 200 and the 1st string has three fault luminescence units 200.As controlled to close the mode of whole luminescence unit string, must short circuit nearly 26 luminescence unit 100(5 former faults and 21 additionally close).But as carried out in mode of the present invention, only need 11 luminescence units of short circuit (5 fault luminescence units 200 and 6 luminescence units of additionally closing 210).
In an embodiment, if having the situation that y luminescence unit string produces fault simultaneously, and fault number is z, and control module 12 can further judge whether following formula is set up:
((m-1)*(x-p+1)-z)≧((n-x)*y+(p-1)*(y-1))
As above formula, set up, control module 12 will directly be closed this luminescence unit string.As be false, control module 12 is by (x-p+1) the individual luminescence unit 100 only needing in other luminescence unit strings of short circuit.
Below the mechanism of carrying out the short circuit of luminescence unit 100 for control module 12 is described in detail.
In an embodiment, control module 12 will store a short circuit luminescence unit table of comparisons (not illustrating), to record in each luminescence unit string the luminescence unit 100 of short circuit and this luminescence unit 100 fault whether of short circuit.Because control module 12 is that cross-pressure value according to the corresponding current control unit 140 of each luminescence unit string has judged whether luminescence unit 100 faults, so the generation that control module 12 only can failure judgement situation, but cannot learn fault be which.Therefore,, when carrying out short circuit action, will sequentially the luminescence unit 100 in this string be carried out to short circuit one by one, and check whether the cross-pressure value of current control unit 140 rises again, to judge whether to be closed to the luminescence unit 100 of normal operation.
When the luminescence unit 100 of normal operation is closed, its pressure drop originally will be transferred to current control unit 140 and made the cross-pressure value of current control unit 140 increase.Therefore control module 12 will open the paralleling switch 104 of this luminescence unit 100 again, so that luminescence unit 100 reverts to path, light-emitting component 102 can continue normal running.And when the cross-pressure value of control module 12 judgement current control units 140 does not rise, represent that the luminescence unit 100 of institute's short circuit is the luminescence unit 200 of fault, and by the outcome record of short circuit in the short circuit luminescence unit table of comparisons.
In an embodiment, control module 12 is more according in a specific string of the judgement of the short circuit luminescence unit table of comparisons, whether have can normal operation luminescence unit 100 by short circuit.When the luminescence unit 100 of this specific string produces the situation of faults, control module 12 further judge whether the number k of these " short circuit but normally luminescence unit " is less than or equal to the number x of the luminescence unit 100 of fault.
When k is less than or equal to x, control module 12 will be carried out short circuit to fault luminescence unit 200, and recover these short circuit not fault luminescence unit for path.And when k is greater than x, control module 12 will be carried out short circuit to fault luminescence unit 200, and make x short circuit not fault luminescence unit revert to path.Control module 12 will further be changed the short circuit luminescence unit table of comparisons, in new short circuit result is stored in.
For other luminescence unit strings beyond specific string, control module 12 also can be according to the mechanism that the short circuit luminescence unit table of comparisons carries out short circuit.
In an embodiment, during the short circuit of each luminescence unit string outside carrying out this specific string, control module 12 bases are the short circuit luminescence unit table of comparisons, judges whether the luminescence unit 100 of each luminescence unit string has the luminescence unit 100 of short circuit.When thering are the luminescence unit 100 of short circuit and these number q of short circuit luminescence unit 100 be more than or equal to (x-p+1), control module 12 is not carried out short circuit, when the number q of the luminescence unit of short circuit of luminescence unit is less than (x-p+1), control module 12 makes the luminescence unit short circuit of (x-p+1-q) individual not short circuit.
For instance, as being listed as (m=4 at 4 row 13; N=13) in array, the number of luminescence unit 100 faults of the 1st string is that 3 (x=3) and critical fault number are 2(p=2), the luminescence unit 100 that the 2nd string to the 4th string wants to carry out short circuit is respectively two ((x-p+1)=(3-2+1)=2).If now had while surpassing two luminescence units 100 by short circuit to the wherein a string of the 4th string at the 2nd string, control module 12 does not need again the luminescence unit 100 of this string to be carried out to short circuit.And if other luminescence unit strings outside specific string wherein a string while having a luminescence unit 100 by short circuit now, control module 12 only needs one ((x-p+1-q)=(3-2+1-1)=1) in the luminescence unit 10 of remaining not short circuit to carry out short circuit.
Therefore,, after the mechanism by above-mentioned is auxiliary, can has more flexible control for light emitting module 10, and can, when avoiding component wear, maintain as much as possible the brightness of light emitting module 10.
Should be noted, in the above embodiments, be to take the corresponding luminescence unit string of current control unit to describe as example.In other embodiment, a current control unit can correspond to two luminescence unit strings that are in parallel above, and the switch of luminescence unit is controlled and adjusted in above-mentioned mode by control module.
Please refer to Fig. 4.Fig. 4 is in this disclosure one embodiment, a kind of flow chart of light-emitting device control method 400.Light-emitting device control method 400 can be applicable to light-emitting device 1 as shown in Figure 1A and 1B, but not as limit.Light-emitting device control method 400 comprises the following step (should be appreciated that, mentioned step, except chatting especially bright its order person, all can adjust its front and back order according to actual needs in the present embodiment, even can carry out simultaneously or partly simultaneously).
In step 401, make to have light emitting module 1 running of the array of the capable and n row luminescence unit 100 of m.
In step 402, by the cross-pressure value of current control unit 140 corresponding to each luminescence unit strings of control module 12 acquisition, whether the luminescence unit 100 that further judges each luminescence unit string in step 403 fault.When the luminescence unit of this specific string does not break down, flow process will be back to step 402.
When the luminescence unit of this specific string breaks down, whether control module 12 is more than or equal to critical fault number p in step 404 failure judgement number x.When the number of defects is less than critical fault number p, control module 12 will be failure to actuate, and flow process will be back to step 402.
When in step 403, control module 12 failure judgement number x are more than or equal to critical fault number p, whether the control module 12 further number of the luminescence unit of each luminescence unit string institute short circuit outside step 405 judgement has the specific string of fault luminescence unit is more than or equal to the number of the luminescence unit 100 of not short circuit in specific string.This means, judge whether following formula is set up:
(m-1)*(x-p+1)≧(n-x)
As immediately, control module 12 is directly closed this specific string in step 406.
Do not become immediately, control module 12 makes fault luminescence unit 200 short circuits in specific string and makes (x-p+1) individual luminescence unit 210 short circuits in each luminescence unit string outside specific string in step 407, and downgrades in step 408 the direct voltage Vdc that each luminescence unit serial connection is received.
Although this disclosure discloses as above with execution mode; so it is not in order to limit this disclosure; any those skilled in the art; within not departing from the spirit and scope of this disclosure; when being used for a variety of modifications and variations, so the protection range of this disclosure is when being as the criterion depending on the appended claim scope of the applying for a patent person of defining.
Claims (18)
1. a light-emitting device, comprises:
One light emitting module, comprises a plurality of luminescence unit strings, and respectively this luminescence unit string comprises a plurality of luminescence units that are in series, and wherein respectively one end of this luminescence unit string receives a direct voltage jointly;
One brightness adjustment control bus, comprises a plurality of current control units, and at least one of them is connected with this luminescence unit string for each, to control a respectively electric current of this luminescence unit string;
One control module, in order to an acquisition cross-pressure value of this current control unit respectively, further judgement this luminescence unit fault whether of this luminescence unit string respectively; And
When this luminescence unit of a specific string of this luminescence unit string breaks down and when a number of defects x is more than or equal to a critical fault number p, this control module makes this luminescence unit short circuit of fault in this specific string and makes (x-p+1) individual this luminescence unit short circuit in respectively this luminescence unit string outside this specific string, to downgrade this direct voltage that respectively this luminescence unit serial connection is received.
2. light-emitting device as claimed in claim 1, wherein the number m of this luminescence unit string is less than the number n of this luminescence unit that respectively this luminescence unit string comprises.
3. light-emitting device as claimed in claim 2, when wherein respectively number (m-1) * (x-p+1) of this luminescence unit of this luminescence unit string institute short circuit outside this control module judges this specific string is more than or equal in this specific string not the number of this luminescence unit of short circuit (n-x), this control module is closed this specific string.
4. light-emitting device as claimed in claim 1, wherein respectively this luminescence unit more comprises a light-emitting component and a paralleling switch, and this control module is by controlling this paralleling switch conducting with this light-emitting component corresponding to short circuit.
5. light-emitting device as claimed in claim 1, wherein this control module store one the short circuit luminescence unit table of comparisons with record at least one luminescence unit of short circuit and this short circuit luminescence unit fault whether in this luminescence unit string respectively.
6. light-emitting device as claimed in claim 5, wherein this control module is when carrying out this specific string short circuit, judge whether the normal operation person wherein of this luminescence unit in this specific string to carry out short circuit, with when to this normal operation person's short circuit, make this normal operation person revert to path.
7. light-emitting device as claimed in claim 6, wherein this control module more according to this short circuit luminescence unit table of comparisons judge whether this luminescence unit of this specific string has the normal luminescence unit of at least one short circuit, with in this, when the number k of the normal luminescence unit of short circuit has been less than or equal to x, make this normal luminescence unit of short circuit revert to path, and when k is greater than x, make x this normal luminescence unit of short circuit revert to path.
8. light-emitting device as claimed in claim 6, wherein control module sequentially this specific string of short circuit this luminescence unit one of them and according to this cross-pressure value of this current control unit judge whether to this normal luminescence unit of short circuit carry out short circuit.
9. light-emitting device as claimed in claim 5, wherein during respectively this luminescence unit string short circuit outside carrying out this specific string of this control module, according to this short circuit luminescence unit table of comparisons judge whether respectively this luminescence unit string outside this specific string has this short circuit luminescence unit, when this number q of short circuit luminescence unit be more than or equal to (x-p+1), this control module is not carried out short circuit, when this luminescence unit this number q of short circuit luminescence unit be less than (x-p+1), this control module makes this luminescence unit short circuit of (x-p+1-q) individual not short circuit.
10. light-emitting device as claimed in claim 2, the situation and the fault number that wherein when y this luminescence unit string, produce fault are z, and (during (m-1) * (x-p+1)-z)≤((n-x) * y+ (p-1) * (y-1)), this control module is closed y this luminescence unit string.
11. 1 kinds of light-emitting device control methods, comprise:
Make a light emitting module running of a light-emitting device, wherein this light emitting module comprises a plurality of luminescence unit strings, and respectively this luminescence unit string comprises a plurality of luminescence units that are in series, and wherein respectively one end of this luminescence unit string receives a direct voltage jointly;
Capture a plurality of current control units and divide other cross-pressure value, further judgement this luminescence unit fault whether of this luminescence unit string respectively, wherein this current control unit and this luminescence unit string connecting wherein respectively; And
When this luminescence unit of a specific string of this luminescence unit string breaks down and when a number of defects x is more than or equal to a critical fault number p, make this luminescence unit short circuit of fault in this specific string and make (x-p+1) individual this luminescence unit short circuit in respectively this luminescence unit string outside this specific string, to downgrade this direct voltage that respectively this luminescence unit serial connection is received.
12. light-emitting device control methods as claimed in claim 11, wherein the number m of this luminescence unit string is less than the number n of this luminescence unit that respectively this luminescence unit string comprises.
13. light-emitting device control methods as claimed in claim 12, wherein more comprise when respectively number (m-1) * (x-p+1) of this luminescence unit of this luminescence unit string institute short circuit of judgement outside this specific string is more than or equal in this specific string not the number of this luminescence unit of short circuit (n-x), close this specific string.
14. light-emitting device control methods as claimed in claim 11, wherein in the step of carrying out this specific string short circuit, more comprise and judge whether the normal operation person wherein of this luminescence unit in this specific string to carry out short circuit, with when to this normal operation person's short circuit, make this normal operation person revert to path.
15. light-emitting device control methods as claimed in claim 14, wherein more comprise and judge whether this luminescence unit of this specific string has the normal luminescence unit of at least one short circuit, with in this, when the number k of the normal luminescence unit of short circuit has been less than or equal to x, make this normal luminescence unit of short circuit revert to path, and when k is greater than x, make x this normal luminescence unit of short circuit revert to path.
16. light-emitting device control methods as claimed in claim 14, wherein in the step of carrying out this specific string short circuit, more comprise this specific string of short circuit sequentially this luminescence unit one of them and according to this cross-pressure value of this current control unit judge whether to this normal luminescence unit of short circuit carry out short circuit.
17. light-emitting device control methods as claimed in claim 11, the respectively step of this luminescence unit string short circuit outside carrying out this specific string wherein, more comprise and judge whether this luminescence unit of respectively this luminescence unit string outside this specific string has this short circuit luminescence unit, when this number q of short circuit luminescence unit be more than or equal to (x-p+1), do not carry out short circuit, when this number q of short circuit luminescence unit be less than (x-p+1), make this luminescence unit short circuit of (x-p+1-q) individual not short circuit.
18. light-emitting device control methods as claimed in claim 12, wherein more comprise the situation that produces fault when y this luminescence unit string, fault number in each y this luminescence unit string is z, and (during (m-1) * (x-p+1)-z)≤((n-x) * y+ (p-1) * (y-1)), close y this luminescence unit string.
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| CN201310039108.7A CN103974492B (en) | 2013-01-31 | 2013-01-31 | Light-emitting device and control method thereof |
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| CN201310039108.7A CN103974492B (en) | 2013-01-31 | 2013-01-31 | Light-emitting device and control method thereof |
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