CN100538474C - Backlight control circuit - Google Patents
Backlight control circuit Download PDFInfo
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- CN100538474C CN100538474C CNB2006101630085A CN200610163008A CN100538474C CN 100538474 C CN100538474 C CN 100538474C CN B2006101630085 A CNB2006101630085 A CN B2006101630085A CN 200610163008 A CN200610163008 A CN 200610163008A CN 100538474 C CN100538474 C CN 100538474C
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Abstract
The present invention proposes a kind of backlight control circuit, comprises: voltage supply circuit is a booster circuit, accepts an input voltage from an input end, and an output terminal is produced an output voltage, and this output voltage is as the operating voltage that light-emitting component is provided; At least one is connected electrically in the input end capacitor device between input end and the ground connection; And at least one is connected electrically in the output terminal capacitor between output terminal and the input end, the withstand voltage specification of this output terminal capacitor wherein, and specific output voltage is low.The present invention can reduce the whole cost of backlight control circuit to reach the backlight control circuit of high output voltage than the capacitor that hangs down withstand voltage specification.
Description
Technical field
The present invention relates to a kind of backlight control circuit (Backlight Control Circuit), particularly relate to the backlight control circuit that a kind of capacitor with low withstand voltage specification reaches high output voltage.
Background technology
In the liquid crystal indicator, it is luminous behind from LCD screen to control light emitting diode with backlight control circuit, is watched picture on the screen to make the user.
Early stage because LED backlight only is applied to small-size screen, and required back lighting brightness needn't be too strong, therefore can be with all series connection or all in parallel of all light emitting diodes.With full series connection is example, as shown in Figure 1, the backlight control circuit 1 in the prior art includes a backlight control integrated circuit 10, and this backlight control integrated circuit 10 has an input end and an output terminal, this input end is connected with an input end capacitor device Cin, to receive input voltage vin; This output terminal is connected with an output terminal capacitor Cout, so that output voltage V out to be provided.(except that integrated circuit 10 and two capacitors,, still need to cooperate some outward elements, as magnetic element etc., because of irrelevant, so omitted with this case according to present integrated circuit integration technology.) backlight control integrated circuit 10 is by its inner voltage supply circuit 11, according to the signal 15 of error amplifying circuit 13, provides output voltage V out light emitting diode L1-LN to series connection.Simultaneously, on the light-emitting diodes canal path of series connection, be provided with a resistance R, by the voltage at extraction node Vsense1 place, and with the reference voltage Vref comparison, whether meet required to check by the electric current on the light emitting diode series connection path, when electric current was lower than default value, the voltage at node Vsense1 place descended, the signal 15 that this moment, error amplifying circuit 13 was sent, to control voltage supply circuit 11 and draw high output voltage V out, that is draw high electric current on the light emitting diode series connection path.Again, unrestrictedly draw high voltage (for example open circuit in error amplifying circuit 13 faults or light emitting diode series connection path) for preventing voltage supply circuit 11, usually can in backlight control circuit 10, set up an excess voltage protection 12, its detecting output voltage V out, and when output voltage V out is too high, send signal control voltage supply circuit 11, make it stop to draw high voltage and (decide on circuit design, stop supplies voltage fully, or voltage remained on a certain higher limit; In backlight control circuit, generally take second kind of practice.)
The general practice of excess voltage protection 12 can with the voltage and the predefined reference voltage Vovp comparison at node Vsense2 place, and be sent signal according to comparative result and be controlled voltage supply circuit 11 from output voltage V out extraction dividing potential drop as shown in Figure 2.
See also Fig. 3 again, this is light emitting diode when complete in parallel, one of prior art backlight control circuit example.As shown in the figure, this backlight control circuit 2 includes a backlight control integrated circuit 20, and the electric current in this backlight control integrated circuit 20 on each light emitting diode L1-LN is controlled by current source CS1-CSN respectively.Backlight control integrated circuit 20 comprises a minimum voltage selection circuit 21, in the cathode terminal of selecting all light emitting diode L1-LN, and the voltage the lowest, and, control voltage supply circuit 11 by this with this selected voltage and reference voltage Vref comparison.So, output voltage V out is controlled, and makes all current source circuits all have enough operating voltage can operate as normal, also makes all light emitting diodes normally shinny.
In the backlight control integrated circuit 20, also can comprise an excess voltage protection 12, its practice as hereinbefore, so give omission.
Therefore in above-mentioned full series connection or the full arrangement in parallel, the number of light emitting diode is restriction to some extent all, thinks naturally and can connection in series-parallel and usefulness.To this, one of prior art is for example shown in Figure 4, wherein use known backlight control integrated circuit 10 shown in Figure 1 that the series-parallel circuit of voltage to light emitting diode is provided, but only check that by the electric current on the light emitting diode L1-LN tandem paths other light emitting diode series connection path then will not be detected.
The practice of another kind of prior art is to use known backlight control integrated circuit 20 shown in Figure 3, and constitutes light emitting diode series-parallel circuit as shown in Figure 5.
In the circuit shown in above Fig. 1,4,5, when light emitting diode series connection number is high more, represent that promptly output voltage V out must raise accordingly.At this moment, the capacitor Cout of output terminal also must use the capacitor of higher withstand voltage specification accordingly; So, certainly will improve the whole cost of backlight control circuit.
Summary of the invention
In view of this, the present invention proposes a kind of backlight control circuit that can reach high output voltage with the capacitor of low withstand voltage specification, to solve foregoing problems promptly at the deficiency of above-mentioned prior art.
For reaching above-mentioned purpose, in one of them embodiment of the present invention, provide a kind of backlight control circuit, comprise: voltage supply circuit, it accepts an input voltage from an input end, and an output terminal is produced an output voltage, and this output voltage provides the operating voltage as light-emitting component; At least one is connected electrically in the input end capacitor device between input end and the ground connection; And at least one is connected electrically in the output terminal capacitor between output terminal and the input end, the withstand voltage specification of this output terminal capacitor wherein, and specific output voltage is low.
In the foregoing description, for take precautions against output terminal capacitor be connected with input end the noise problem that may cause, can further in voltage supply circuit, comprise a noise filtering circuit.
In addition, providing input voltage electrical power source, is good to have low internal driving person, that is its all low person of resistance that electric current (current sourcing) and ABSORPTION CURRENT (current sinking) are provided is for good.
Below will be by specific embodiment be illustrated in detail, when the purpose that is easier to understand the present invention, technology contents, characteristics and the effect reached thereof.
Description of drawings
Graphic explanation:
Fig. 1 is the full series connection circuit of LED of prior art and the schematic circuit diagram of backlight control circuit.
Fig. 2 is the schematic circuit diagram of the excess voltage protection of prior art.
Fig. 3 is the circuit of LED complete in parallel of prior art and the schematic circuit diagram of backlight control circuit.
Fig. 4 is a schematic circuit diagram, and an example of the connection in series-parallel circuit of LED and the backlight control circuit of prior art is shown.
Fig. 5 is a schematic circuit diagram, and another example of the connection in series-parallel circuit of LED and the backlight control circuit of prior art is shown.
Fig. 6 is the schematic circuit diagram according to the backlight control circuit of one embodiment of the invention.
Fig. 7 is a schematic circuit diagram, in order to the internal model of explanation power supply.
Fig. 8,9 illustrates in voltage supply circuit 11, and how noise filtering circuit 60 is set.
Figure 10 A-10D illustrates four embodiment of voltage regulator circuit.
Figure 11 A and Figure 11 B illustrate two embodiment of low-pass filter circuit.
Figure 12 A and Figure 12 B illustrate two embodiment that the peak voltage pincers ends circuit.
Symbol description among the figure
1,2,3 backlight control circuits
5 power supplys
10 backlight control integrated circuit
11 voltage supply circuits
12 excess voltage protections
13 error amplifying circuits
15 signals
20 backlight control integrated circuit
21 minimum voltages are selected circuit
30 backlight control integrated circuit
51,52 paths
53,54 ideal diodes
60 noise filtering circuit
The element group of 70 pairs of noise-sensitive
The element group of 80 pairs of insensitive for noise
Cin input end capacitor device
The Cout output terminal capacitor
The CS1-CSN current source
The L1-LN light emitting diode
R, Rs1, Rs2 resistance
The Vs ideal voltage source
Embodiment
Generally speaking, because light emitting diode variation during fabrication, the cross-pressure of white light or blue light-emitting diode may be 3.3V to 4V.On circuit design, must consider the variation of each light emitting diode in conservative mode, therefore, multiply by the light emitting diode number of connecting on the light-emitting diodes canal path with 4V usually, calculate required output voltage V out.In other words, suppose that the light emitting diode of connecting on each bar light-emitting diodes canal path outnumbers (containing) 13, Vout promptly should be greater than 50V.(4*13＝52>50)
With low thickness, small size, low parasitic series resistance, overall efficiency costs such as environmental requirement are recently considered, and on the LED backlight circuit application, ceramic capacitor is first-selected.Yet, the commonly used withstand voltage specification of present ceramic capacitor, its grade is: 6.3V/10V/16V/25V/50V/100V/200V/...., and the every rising one-level of specification (that is capacitor of use high gauge), cost promptly increases several times relatively.For example, withstand voltage specification is the capacitor of 100V, and its cost is that the twice of the capacitor of withstand voltage specification 50V is had a surplus.Therefore, suppose that the light emitting diode of connecting on each bar light-emitting diodes canal path outnumbers (containing) 13,, just must use the capacitor of withstand voltage specification, be used as output capacitor Cout as 100V according to the prior art circuits shown in Fig. 1,4,5.
But in the present invention, then can adopt the mode of less expensive, use the capacitor of low withstand voltage specification to be used as output capacitor Cout.Please refer to Fig. 6, wherein the mode with schematic circuit diagram shows one of them embodiment of the present invention.In the backlight control circuit 3 of present embodiment, include backlight control integrated circuit 30, and external capacitor element Cin and Cout.Input voltage vin is supplied by power supply 5.As shown in the figure, one of them characteristic of the present invention are that output capacitor Cout is received input end and do not receive ground.Therefore, the cross-pressure value on the output capacitor Cout has only Vout-Vin, can use the capacitor of the withstand voltage specification lower than the Vout value.
Generally speaking, on present notebook computer or similar products in the common application scenario of white light emitting diode backlight control circuit, input voltage vin is supplied by 3～4 lithium batteries or lithium polymer battery serial connection, this voltage (contains charger voltage) greatly below 24V, be generally about 10V-24V, but when the energy content of battery will be use up, may drop to below the 10V; Maximum output voltage Vout is approximately 40V-60V, and it may be 10～15 white light emitting diode serial connections.Some application scenarios are also arranged in addition, and input voltage vin is supplied by 2 lithium batteries or lithium polymer battery serial connection, (contains charger voltage) greatly below 15V, is generally 6.6V-15V, but when the energy content of battery will be use up, may drops to below the 6.6V; Maximum output voltage Vout is approximately 24V-32V, and it may be 6～8 white light emitting diode serial connections.(that is under most of occasions, voltage supply circuit 11 is a booster circuit.) as adopting the prior art circuits shown in Fig. 1,4,5, as output voltage V out during greater than 50V, just output terminal must use the capacitor of withstand voltage specification as 100V.But if embodiments of the invention are applied to above-mentioned occasion, then input end can use the capacitor of withstand voltage specification as 25V, and output terminal can use the capacitor of withstand voltage specification as 50V; Or under other occasion, output terminal can use the capacitor of withstand voltage specification as 25V or other specification, or the like, decide on the difference of output voltage V out and input voltage vin, and needn't use identical with output voltage V out or the higher capacitor of withstand voltage specification than Vout.
As adopt embodiment shown in Figure 6, then because output terminal is connected to input end by output capacitor Cout, so the noise on the output terminal (for example ripple noise, ripple noise), also can be sent within the backlight control circuit 3 from input end.To this, the present invention also proposes solution.
At first, providing the power supply of input voltage vin, is good with the power supply with low internal driving.See also Fig. 7, representative provides the power source model of input voltage vin.Power supply 5 among the figure comprises a desirable voltage source V s and two paths: the path 51 that electric current (current sourcing) is provided, have a desirable diode 52 (defining its conducting cross-pressure at this is zero) and resistance R s1 on it, and the path 53 of another ABSORPTION CURRENT (current sinking), have a desirable diode 54 and resistance R s2 (Rs1, Rs2 are commonly referred to as internal resistance or internal driving) on it.
According to this case inventor's derivation, when the noise on the output terminal was coupled to input end by output capacitor Cout, its coupling effect was relevant with the resistance of ratio, Rs1 and the Rs2 of Cout/Cin; When the resistance of ratio, Rs1 and the Rs2 of Cout/Cin was big more, coupling effect was big more.
Therefore, according to the present invention, providing the power supply of input voltage vin, having low internal driving person for good, that is is good with all low person of resistance of Rs1 and Rs2.According to the present invention, the power supply that meets this condition comprises lithium ion (Li-ion) battery, lighium polymer (Li-polymer) battery, nickel-cadmium battery (NiCd), Ni-MH battery (NiMH), suitably fuel cell (FuelCell) under being equipped with and the power supply etc. that is parallel with super capacitor (Super Capacitor is generally the above person of capacitance 0.1F).
Secondly, for avoiding voltage supply circuit 11 affected by noise, in backlight control circuit 3, should comprise circuit with filtered noise function, for example voltage regulator circuit (regulator), filtering circuit such as low-pass filter circuit (low-pass filter) or peak voltage pincers end circuit (spikevoltage clamper) etc., after noise is filtered, input to voltage supply circuit 11 inside again, these have the circuit of filtered noise function, and it is inner or outside to be arranged on IC.
The notion of the above-mentioned practice can be with reference to Fig. 8, in voltage supply circuit 11 inside, includes to the element group 70 of noise-sensitive with to the element group 80 of insensitive for noise.Element to noise-sensitive for example is reference voltage supplies circuit (reference voltage supplier), current setting circuit (current bias circuit), error amplifier (error amplifier), comparer (comparator), oscillator (oscillator), voltage sensor (voltage sensor), current sensor (currentsensor), temperature sensor (temperature sensor) or the like.Element to insensitive for noise for example is electric potential transfer circuit (level shifter), power output stage (power stage) or the like.(because voltage supply circuit 11 known by present technique person, thus numerical example explanation only slightly lifted at this, and shows in detail one by one not.) according to the present invention, the voltage of input end input earlier via noise filtering circuit 60, after noise filtering, can be supplied to the element to noise-sensitive again; As for element, then can directly receive input voltage to insensitive for noise.But certainly, as shown in Figure 9, to the element of insensitive for noise, but the also voltage behind the receiving filtration noise; Though in the icon noise filtering circuit 60 is illustrated in the inside of voltage supply circuit 11, also noise filtering circuit 60 can be arranged on the outside of voltage supply circuit 11 even the outside of backlight control integrated circuit 30 certainly again.
As previously mentioned, have the circuit 60 of filtered noise function, for example can be voltage regulator circuit (regulator), filtering circuit such as low-pass filter circuit (low-pass filter) or peak voltage pincers and end circuit (spike voltage clamper).The concrete practice of the above each circuit can be consulted Figure 10-12.
Figure 10 A-10D marks four embodiment of voltage regulator circuit.The icon circuit, input voltage vin can be adjusted (regulation) after, convert muting builtin voltage Vinternal to, the inner member of voltage supplied supply circuit 11 uses.
Figure 11 A, 11B mark two embodiment of low-pass filter circuit.The icon circuit after the high frequency noise in the input voltage vin can being filtered, converts builtin voltage Vinternal to, and the inner member of voltage supplied supply circuit 11 uses.
Figure 12 A, 12B mark two embodiment that the peak voltage pincers ends circuit.The icon circuit can be filtered emergent high pressure surging in the input voltage vin, and the voltage transitions after will filtering becomes builtin voltage Vinternal, the inner member use of voltage supplied supply circuit 11.
Except that the above, voltage regulator circuit, low-pass filter circuit and peak voltage pincers end circuit still other various embodiments, is familiar with present technique person and can does corresponding circuit variation according to the needs on the circuit design, all should be included within the notion of the present invention.
Below at preferred embodiment the present invention is described, the above only is familiar with present technique person and is easy to understand content of the present invention for making, and is not the interest field that is used for limiting the present invention.As previously mentioned, for being familiar with present technique person, when can in spirit of the present invention, thinking immediately and various equivalence variation.For example, cause the situation of high output voltage must be provided and establish, in the full parallel-connection structure of light emitting diode as shown in Figure 2, also can use arrangement of the present invention though The present invention be directed to light emitting diode series connection.Again for example, direct-connected two elements shown in all embodiment can insert the circuit that does not influence major function, for example on-off circuit, diode circuit, resistance circuit etc. betwixt.Again for example, in the illustrated embodiment, each only establishes a capacitor input end and output terminal, but if will surpass a capacitor at input end or output terminal setting, also is fine certainly.Again for example, though be independent component with capacitor Cin and Cout among the embodiment, and other parts are incorporated among the integrated circuit 30, other integration mode also is possible.Again for example, in the illustrated embodiment, comprise current source, minimum voltage selection circuit, error amplifier or the like in the backlight control integrated circuit 30, control voltage supply circuit 11, but this is only for illustrating wherein a kind of embodiment of backlight control integrated circuit 30 to produce signal 15; In the backlight control integrated circuit 30, can adopt alternate manner to control voltage supply circuit 11.Again, though shown in light-emitting component be light emitting diode, can be other light-emitting component also, as Organic Light Emitting Diode; Described " backlight " control circuit can not necessarily be controlled " backlight ", also can be used in the active illuminating panel, or light emitting diode illuminating apparatus or the like.So all a notion and spirit impartial for it a variation or modification according to the present invention all should be included in the claim scope of the present invention.
Claims (17)
1. backlight control circuit comprises:
Voltage supply circuit, it is a booster circuit, accepts an input voltage from an input end, and an output terminal is produced an output voltage, this output voltage provides the operating voltage as light-emitting component;
At least one is connected electrically in the input end capacitor device between input end and the ground connection; And
At least one is connected electrically in the output terminal capacitor between output terminal and the input end, the withstand voltage specification of this output terminal capacitor wherein, and specific output voltage is low.
2. backlight control circuit as claimed in claim 1, wherein this input voltage is below 24V, and output voltage is in the scope of 40V-60V.
3. backlight control circuit as claimed in claim 1, wherein this input voltage is supplied by the lithium ion battery or the lithium polymer battery of 3 or 4 series connection, and output voltage is in the scope of 40V-60V.
4. backlight control circuit as claimed in claim 1, wherein this input voltage is below 15V, and output voltage is in the scope of 24V-32V.
5. backlight control circuit as claimed in claim 1, wherein this input voltage is supplied by the lithium ion battery or the lithium polymer battery of 2 series connection, and output voltage is in the scope of 24V-32V.
6. backlight control circuit as claimed in claim 1, wherein this output voltage is greater than 50V, and the withstand voltage specification of this output terminal capacitor is for being less than or equal to 50V.
7. backlight control circuit as claimed in claim 1, wherein this output voltage is greater than 25V, and the withstand voltage specification of this output terminal capacitor is for being less than or equal to 25V.
8. backlight control circuit as claimed in claim 1, wherein this output voltage provides the operating voltage as at least one group of series connection light-emitting component, and the number of this group series connection light-emitting component is more than or equal to 13.
9. backlight control circuit as claimed in claim 1, wherein this input end is electrically connected with a power supply, and this power supply has low internal driving.
10. backlight control circuit as claimed in claim 9, wherein this power supply is selected from one of following power supply: lithium ion battery, lithium polymer battery, nickel-cadmium battery, Ni-MH battery, fuel cell and the power supply that is parallel with super capacitor.
11. backlight control circuit as claimed in claim 1 wherein has the noise filtering circuit in this voltage supply circuit, after this noise filtering circuit received input voltage, the inner member that produces builtin voltage voltage supplied supply circuit used.
12. backlight control circuit as claimed in claim 11 wherein has the element to noise-sensitive in this voltage supply circuit, this element to noise-sensitive receives the builtin voltage that the noise filtering circuit is produced.
13. backlight control circuit as claimed in claim 11, wherein this noise filtering circuit is that voltage regulator circuit, filtering circuit or peak voltage pincers end circuit.
14. backlight control circuit as claimed in claim 12, wherein this element to noise-sensitive comprises one of following element or many persons: reference voltage supplies circuit, current setting circuit, error amplifier, comparer, oscillator, voltage sensor, current sensor, temperature sensor.
15. backlight control circuit as claimed in claim 1, wherein said light-emitting component are light emitting diode.
16. backlight control circuit as claimed in claim 1, wherein said light-emitting component are white light emitting diode.
17. backlight control circuit as claimed in claim 1, wherein said light-emitting component are Organic Light Emitting Diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101630085A CN100538474C (en) | 2006-11-28 | 2006-11-28 | Backlight control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101630085A CN100538474C (en) | 2006-11-28 | 2006-11-28 | Backlight control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101191956A CN101191956A (en) | 2008-06-04 |
| CN100538474C true CN100538474C (en) | 2009-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101630085A Active CN100538474C (en) | 2006-11-28 | 2006-11-28 | Backlight control circuit |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102159007A (en) * | 2011-02-15 | 2011-08-17 | 明基电通有限公司 | Power control method |
| TWI483652B (en) * | 2012-12-21 | 2015-05-01 | Upi Semiconductor Corp | Led driving circuit and protection method thereof |
| CN109509450B (en) * | 2018-12-19 | 2021-05-14 | 惠科股份有限公司 | Reference voltage regulating circuit, driving circuit of display panel and display device |
| CN112201210A (en) * | 2020-10-29 | 2021-01-08 | Tcl华星光电技术有限公司 | Drive circuit, backlight module and display device |
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- 2006-11-28 CN CNB2006101630085A patent/CN100538474C/en active Active
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| CN101191956A (en) | 2008-06-04 |
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