CN102159007A - Power control method - Google Patents
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- CN102159007A CN102159007A CN 201110039740 CN201110039740A CN102159007A CN 102159007 A CN102159007 A CN 102159007A CN 201110039740 CN201110039740 CN 201110039740 CN 201110039740 A CN201110039740 A CN 201110039740A CN 102159007 A CN102159007 A CN 102159007A
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Abstract
The invention provides a power control method, which is used for controlling power supply to at least one backlight source circuit of a display device. The display device is provided with a voltage conversion circuit, at least one regulation circuit, a voltage sensing circuit, a debugging comparison circuit and the backlight source circuit, wherein the voltage conversion circuit outputs a first DC voltage to the backlight source circuit to produce a first current, and the first current flows into the backlight source circuit and the regulation circuit which are connected in series. The method comprises the following steps of: sensing the operating voltage of the regulation circuit to obtain a sensed voltage by utilizing the voltage sensing circuit; calculating a voltage difference value between the sensed voltage and a preset voltage by utilizing the debugging comparison circuit; and controlling the voltage conversion circuit according to the voltage difference value to regulate the first DC voltage. By the power control method, unnecessary power loss can be reduced.
Description
Technical field
The present invention is about power control method, refers in particular to a kind of power control method of power supply supply of the backlight circuit in order to the control display unit.
Background technology
In general, the structure of LCD please refer to shown in Figure 1, LCD 100 includes liquid crystal panel module 110 and backlight source module 120, backlight source module 120 is mainly in order to provide light to liquid crystal panel module 110,110 of liquid crystal panel modules are according to driving signal, with the light modulation to generate image.Backlight source module 120 needs bigger direct voltage (about about 50 volts) to drive, and, for the brightness of keeping the shown picture of liquid crystal panel module 110 and the uniformity of color, must supply backlight source module 120 with stable voltage and electric current, to guarantee the consistency of its output brightness.
Wherein, a kind of simple and easy power supply supply and control mode at backlight source module please refer to Fig. 2.As shown in the figure, backlight source module 200 includes a plurality of backlight unit 210a～210d, each backlight unit may be made up of a plurality of light-emitting component L respectively, backlight source module 200 is carried out the power supply supply through the direct voltage Vdd that power supply device 220 is produced, and is supplied to the end of each backlight unit 210a～210d respectively.In general, the brightness that produces of backlight unit 210a～210d is relevant with the size of current of flowing through, so for keeping the brightness uniformity of backlight unit 210a～210d, backlight unit 210a～210d need control with the form of deciding electric current.So the other end of each backlight unit 210a～210d will be coupled to the output electric crystal T1～T4 of current mirror 230, the current replication ability by current mirror 230 can make flow through direct current I1～I4 of backlight unit 210a～210d consistent as far as possible.Yet, since the light-emitting component L that formed of backlight unit 210a～210d may have on the processing procedure that difference caused was inconsistent.Thus, pressure drop Vdrop1～Vdrop4 on each backlight unit is difference to some extent, if the quantity of the light-emitting component L of composition backlight unit is many more, the difference of pressure drop Vdrop1～Vdrop4 is just obvious more, so the cross-pressure Vce1～Vce4 that falls within on electric crystal T1～T4 is also inconsistent more.So, when design current mirror 230, can improve cross-pressure Vce1～Vce4 usually with as the voltage buffering, absorb the difference of pressure drop Vdrop1～Vdrop4 between backlight unit 210a～210d by this.Yet, although improve the mode of cross-pressure Vce1～Vce4, can effectively absorb the pressure drop difference between backlight unit 210a～210d, but such design can cause more meaningless power loss.Particularly when the difference of pressure drop between back light unit 210a～210d was also not obvious, power loss was obvious especially comparatively speaking.Therefore, known techniques still has the weak point that needs to be resolved hurrily.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of power control method, it can come dynamic adjustments to be supplied to the power supply (voltage swing or size of current) of backlight circuit according to the mode of operation of circuit.Wherein, detecting of the present invention and the cross-pressure on the circuit element that the backlight circuit is connected are learnt the pressure drop on the backlight circuit indirectly, to judge whether the adjusting power supply supply.Moreover the present invention also provides the notion of detecting backlight circuit voltage current curve characteristic relation in advance, accurately sets the suitable power supply extent of supply by this.
One embodiment of the invention provide a kind of power control method, and this method is in order to the power supply supply of at least one backlight circuit of control display unit.This display unit has voltage conversion circuit, at least one regulating circuit, voltage detection circuit, debug comparison circuit and this backlight circuit, wherein this voltage conversion circuit is exported first direct voltage to this backlight circuit, to produce this backlight circuit and this regulating circuit that first electric current flows into series connection.This method comprises: utilize this voltage detection circuit to detect the operating voltage of this regulating circuit to draw detecting voltage; Utilize this debug comparison circuit to calculate voltage difference between this detecting voltage and the predeterminated voltage; And control this voltage conversion circuit according to this voltage difference, to adjust this first direct voltage.
According to power control method of the present invention, control this voltage conversion circuit according to this voltage difference, include with the step of adjusting this first direct voltage:, end this voltage conversion circuit and export this first direct voltage when this voltage difference during greater than first predetermined value.
According to power control method of the present invention, control this voltage conversion circuit according to this voltage difference, include with the step of adjusting this first direct voltage:, control this voltage conversion circuit and reduce this first direct voltage when this voltage difference during during greater than second predetermined value and less than first predetermined value.
According to power control method of the present invention, this display unit has a plurality of these backlight circuit and a plurality of regulating circuit, and each backlight circuit is series in each regulating circuit, this first direct voltage is supplied to each backlight circuit respectively, to produce each backlight circuit and each regulating circuit that a plurality of first electric currents flow into series connection respectively.This power control method includes in addition: utilize this voltage detection circuit to detect the operating voltage of each regulating circuit respectively to draw the detecting voltage corresponding to each regulating circuit; And utilize this debug comparison circuit to calculate a plurality of voltage differences between each detecting voltage and predeterminated voltage respectively.
Further, control this voltage conversion circuit, include: the mean value that calculates these a plurality of voltage differences with the step of adjusting this first direct voltage according to this voltage difference; When this mean value during during greater than second predetermined value and less than first predetermined value, control this voltage conversion circuit and reduce this first direct voltage; And, end this voltage conversion circuit and export this first direct voltage when in these a plurality of voltage differences at least one during greater than this first predetermined value.
According to power control method of the present invention, this voltage conversion circuit has controller of pulse width modulation, and the step of adjusting this first direct voltage includes: control this controller of pulse width modulation and adjust this and control this first direct voltage.
Another embodiment of the present invention provides a kind of power control method, and this method is in order to the power supply supply of at least one backlight circuit of control display unit.This display unit has voltage conversion circuit, current-sensing circuit, this backlight circuit and microcontroller, and wherein this voltage conversion circuit is exported first direct voltage to this backlight circuit, flows into this backlight circuit to produce first electric current.This method comprises: the electric current and voltage function curve relation of this backlight circuit of decision control; Concern according to this electric current and voltage function curve and to set this first direct voltage; Calculate electric current difference between this first electric current and the goal-selling electric current by this microcontroller; And control this voltage conversion circuit according to this electric current difference by this microcontroller, to adjust this first direct voltage.
According to power control method of the present invention, determine the step of this electric current and voltage function curve relation of this backlight circuit to include: to control this voltage conversion circuit and produce a plurality of test voltages to input to this backlight circuit; Utilize this current-sensing circuit detect this backlight circuit according to this a plurality of test voltages a plurality of operating currents of generation respectively; Decide this electric current and voltage function curve relation according to these a plurality of test voltages and these a plurality of operating currents.
According to power control method of the present invention, concern that according to this electric current and voltage function curve the step of setting this first direct voltage includes: decide target direct voltage required when making that this backlight circuit is kept this goal-selling electric current of output according to this goal-selling electric current and this electric current and voltage function curve relation; And the value of utilizing this target direct voltage is set this first direct voltage.
According to power control method of the present invention, control this voltage conversion circuit according to this electric current difference, include with the step of adjusting this first direct voltage: when this electric current difference does not fall within first scope, adjust this first direct voltage by this voltage conversion circuit of this microprocessor controls.
According to power control method of the present invention, this display unit has a plurality of these backlight circuit, and wherein this first direct voltage is supplied to this a plurality of these backlight circuit respectively, flows into these a plurality of these backlight circuit to produce a plurality of first electric currents.This power control method includes in addition: determine the pairing equivalent voltage current function of these a plurality of backlight circuit curved line relation; Concern according to this equivalence electric current and voltage function curve and to set this first direct voltage; Control this voltage conversion circuit by this microcontroller according to the equivalent current mean value of these a plurality of first electric currents and the equivalent current difference between this goal-selling electric current, to adjust this first direct voltage.
Compared with prior art, method of the present invention can provide suitable direct voltage to give the backlight circuit accurately, make do not have too much voltage can be expended with other circuit that the backlight circuit is connected on, and, the present invention also can suitable adjusting be supplied to the direct voltage size of backlight circuit, particularly working as the backlight circuit is under the low relatively operating current, pressure drop on the backlight circuit is also lower comparatively speaking at this moment, so the present invention reduces the voltage supply of this moment, to reduce unnecessary power supply consume.
Description of drawings
Fig. 1 is the structure of known LCD.
Fig. 2 is the power supply supply of known backlight source module and the framework of control circuit.
Fig. 3 and Fig. 4 are an embodiment of explanation the inventive method.
Fig. 5 and Fig. 6 are another embodiment of explanation the inventive method.
Fig. 7 is explanation the inventive method principle that concerns in the hope of the electric current and voltage function curve.
Embodiment
In the following content, will and graphicly set forth notion of the present invention with several embodiment, wherein, on behalf of it, the element that has same numeral in difference is graphic similar operating principle and technology effect are arranged.So, hereinafter will omit the narration of repeatability.Moreover mentioned different technologies feature among the different embodiment is not limited to this embodiment in the literary composition.In fact, in reasonable category of the present invention, can see through suitable modification, so that it possesses the peculiar technical characterictic of other embodiment to certain embodiment.
Please also refer to Fig. 3 and Fig. 4, it illustrates the pairing flow chart of the embodiment display unit 400 applied with it of power control method of the present invention respectively.As shown in the figure, the power supply circuit of display unit 400 partly includes (but being not limited to) voltage conversion circuit 410, regulating circuit 420a, voltage detection circuit 430, debug comparison circuit 440, wherein, the voltage conversion circuit 410 exportable first direct voltage Vcc1 are to the backlight circuit 450a of display unit 400, and backlight circuit 450a connects with regulating circuit 420a.The first direct voltage Vcc1 that voltage conversion circuit 410 is exported will cause the first electric current I cc1 to flow into backlight circuit 450a and regulating circuit 420a.The inventive method is in order to the power supply supply of control backlight circuit 450a.As shown in Figure 3, the inventive method comprises:
Step 310: the operating voltage that utilizes voltage detection circuit 430 detecting regulating circuit 420a is to draw detecting voltage Vdect;
Step 320: the voltage difference Vdiff that utilizes debug comparison circuit 440 to calculate between detecting voltage Vdect and the predeterminated voltage Vset;
Step 330: control voltage conversion circuit 410 according to voltage difference Vdiff, to adjust the first direct voltage Vcc1.
Because backlight circuit 450a need control with the form of deciding electric current, so the end of backlight circuit 450a is coupled to regulating circuit 420a to carry out deciding the control of electric current, in an embodiment, regulating circuit 420a may include the output electric crystal T1 of current mirror as shown in Figure 2, carries out deciding the control of electric current by this.Yet the possible framework of regulating circuit 420a is not limited to current mirror framework shown in Figure 2, and any exportable circuit framework of deciding electric current all belongs to category of the present invention.
Except providing constant current source to backlight circuit 450a, regulating circuit 420a can absorb a part of pressure drop, particularly when descending, the electric current of the backlight circuit 450a that flows through (may cause because of specific factor, as: the output brightness that downgrades backlight circuit 450a), when causing the pressure drop that falls within regulating circuit 420a to rise thereupon.And be that the factor of avoiding such causes the pressure drop that falls within on the regulating circuit 420a excessive, and then cause unnecessary power supply to consume, so in step 310, the operating voltage that can utilize voltage detection circuit 430 detecting regulating circuit 420a is to draw detecting voltage Vdect, and detecting voltage Vdect can be corresponding to the pressure drop of regulating circuit 420a.Subsequently, just look the size that detecting voltage Vdect size determines whether adjusting the first direct voltage Vcc1 that voltage conversion circuit 410 supplied, and then change the pressure drop of regulating circuit 420a.In the middle of, if Vdect is higher for detecting voltage, then represent the pressure drop that in fact falls within on the backlight circuit 450a to come for a short time relatively, in other words, voltage conversion circuit 410 needs suitably to reduce by the first direct voltage Vcc1, to avoid meaningless power supply consume (because this moment, backlight circuit 450a did not need so big voltage supply).Therefore, in step 320, the convenient voltage difference Vdiff that calculates between detecting voltage Vdect and the predeterminated voltage Vset with debug comparison circuit 440 of the inventive method, thus, just can differentiate detecting voltage Vdect (corresponding to the pressure drop on the regulating circuit 420a) according to voltage difference Vdiff has much actually.
Afterwards, in step 330, the inventive method is controlled voltage conversion circuit 410 according to voltage difference Vdiff, to adjust the first direct voltage Vcc1.In an embodiment, as voltage difference Vdiff during greater than the first predetermined value Value1, the inventive method can be ended the voltage conversion circuit 410 outputs first direct voltage Vcc1.This is because the big more just representative of voltage difference Vdiff detecting voltage Vdect is many more greater than predeterminated voltage Vset; this situation may represent the cross-pressure that falls within on the regulating circuit 420a quite big; even may be above the rated operational voltage scope of regulating circuit 420a; so in order to protect regulating circuit 420a, the inventive method can be ended the output of voltage conversion circuit 410.Moreover, if voltage difference Vdiff is greater than the second predetermined value Value2, but during less than the first predetermined value Value1, though then represent the pressure drop that falls within on the regulating circuit 420a higher, but be unlikely to cause the damage of regulating circuit 420a or other circuit elements, so only need control voltage conversion circuit 410 instantly and reduce by the first direct voltage Vcc1, can lower the pressure drop that falls within on the regulating circuit 420a.
Moreover, if display unit 400 include more than one backlight circuit (as, backlight circuit 450b and 450c shown in Figure 4), and has an above regulating circuit 420a, when 420b and 420c, then the inventive method can utilize voltage detection circuit 430 to detect the operating voltage of each regulating circuit 420 respectively to draw the detecting voltage Vdect corresponding to each regulating circuit 420a, Vdect1 and Vdect2, and utilize debug comparison circuit 440 to calculate each detecting voltage Vdect respectively again, a plurality of voltage difference Vdiff between Vdect1 and Vdect2 and the predeterminated voltage Vset, Vdiff1 and Vdiff2.Afterwards, the inventive method is with the average voltage Vavg of calculated complex voltage difference Vdiff, Vdiff1 and Vdiff2, and as average voltage Vavg during greater than the second predetermined value Value2 and less than the first predetermined value Value1, control voltage conversion circuit 410 reduces by the first direct voltage Vcc1.In addition, for avoiding circuit element damage, as long as when among a plurality of voltage difference Vdiff, Vdiff1 and the Vdiff2 any one during greater than the first predetermined value Value1, then the inventive method termination voltage conversion circuit 410 is exported the first direct voltage Vcc1.The quantity that should be noted in the discussion above that graphic middle regulating circuit and backlight circuit only is the usefulness of explanation, is not restriction of the present invention.
In an embodiment, voltage conversion circuit 410 may have controller of pulse width modulation (pulsewidth modulation controller, PWM controller), regulate the size of the first direct voltage Vcc1 by this, and method of the present invention utilizes promptly this controller of pulse width modulation of control to adjust the first direct voltage Vcc1.Should be noted in the discussion above that this mode is not the unique technical means that the present invention adjusts the first direct voltage Vcc1.In other possibilities of the present invention embodiment, should see through other circuit elements of adjusting voltage conversion circuit 410 and reach the technique effect of adjusting the first direct voltage Vcc1.
Another embodiment of the present invention provides a kind of different mode to decide the direct voltage size that is supplied to the backlight circuit, it carries out the electric current and voltage function curve that sweep test decides the backlight circuit in advance, thus can be before reality be to backlight circuit power supply, get rid of the uncertainty that pressure drop difference is brought in advance, and also can exempt the use of regulating circuit.Please also refer to Fig. 5 and Fig. 6 about this embodiment, the display unit 600 that its pairing flow chart and its of another embodiment that illustrates power control method of the present invention respectively is applied to.As shown in the figure, the power suppling part branch of display unit 600 includes (but being not limited to) voltage conversion circuit 610, current-sensing circuit 620 and microcontroller 630.Wherein, the voltage conversion circuit 610 exportable second direct voltage Vcc2 are to the backlight circuit 640a of display unit 600.The second direct voltage Vcc2 that voltage conversion circuit 610 is exported will cause one second electric current I cc2 to flow into backlight circuit 640a.The inventive method is the power supply supply in order to control backlight circuit 640a.Method of the present invention includes:
Step 510: the electric current and voltage function curve of decision backlight circuit 640a concerns Func;
Step 520: concern that according to the electric current and voltage function curve Func sets the second direct voltage Vcc2;
Step 530: by the electric current difference Idiff between microcontroller 630 calculating second electric current I cc2 and the goal-selling electric current I target; And
Step 540: control voltage conversion circuit 610 by microcontroller 630 according to electric current difference Idiff, to adjust the second direct voltage Vcc2.
The characteristic of present embodiment is to determine in advance the operating current of backlight circuit 640a and the relation between the voltage, and selects the preferable voltage extent of supply according to the electric current and the voltage relationship that are determined.So in step 510, the electric current and voltage function curve that meeting of the present invention draws backlight circuit 640a earlier concerns Func.According to this, method of the present invention control voltage conversion circuit 610 earlier produces a plurality of test voltage Vtest to input to backlight circuit 640a, then, utilize electric current detect lateral circuit 620 detect backlight circuit 640a its based on a plurality of test voltage Vtest a plurality of operating current Itest of producing respectively, at last, decide this electric current and voltage function curve relation according to a plurality of test voltage Vtest and a plurality of operating current Itest again.Please refer to Fig. 7 about detailed explanation, as shown in the figure, the present invention utilizes a plurality of test voltage Vtest just can roughly define the electric current and voltage function curve to concern Func.Please note, as the requirement of test voltage Vtest might not need as shown in the figure fully, in fact, if can provide many more test voltage Vtest-1～Vtest-n to detect the operating current Itest-1～Itest-n of backlight circuit 640a correspondence, can obtain more accurately that the electric current and voltage function curve concerns Func, and the electric current and voltage function curve concerns that Func can be tried to achieve by microcontroller 630.
After the electric current and voltage function curve that obtains backlight circuit 640a concerned Func, the inventive method can concern that Func sets the second direct voltage Vcc2 (step 520) according to the electric current and voltage function curve.In the middle of, concern that according to goal-selling electric current I target and electric current and voltage function curve Func decides the required target direct voltage Vtarget of Itarget when making that backlight circuit 640a keeps output goal-selling electric current.Wherein, goal-selling electric current I target is the output brightness that is relevant to backlight circuit 640a, that is to say, the present invention can decide goal-selling electric current I target and target direct voltage Vtarget according to required brightness, and sets the second direct voltage Vcc2 according to target direct voltage Vtarget.Such mode, comparable previous embodiment are adjusted the second direct voltage Vcc2 more accurately, yet its cost is to adopt microcontroller 630 just to have way to carry out so calculating of voltage-current relationship.
Afterwards, meeting of the present invention judges whether to need to adjust the second direct voltage Vcc2 according to the second direct current Icc2 that is produced based on the second direct voltage Vcc2.Wherein, can be by the electric current difference Idiff (step 530) between the microcontroller 630 calculating second electric current I cc2 and this goal-selling electric current I target.The numerical value of the second direct current Icc2 then can be obtained by current-sensing circuit 620.After the electric current difference is calculated, just can utilize microcontroller 630 to control voltage conversion circuit 610, to adjust the second direct voltage Vcc2 (step 540) according to electric current difference Idiff.Wherein, the step of adjusting the second direct voltage Vcc2 comprises again, utilize microcontroller 630 to judge whether that electric current difference Idiff falls within first scope, and when electric current difference Idiff does not fall within this first scope, then adjust the second direct voltage Vcc2 by microcontroller 630 control voltage conversion circuits 610.
Moreover, if display unit 600 include more than one backlight circuit (as, backlight circuit 640b and 640c shown in Figure 6), then the inventive method can utilize current-sensing circuit 620 to detect the electric current and voltage function curve relation of the whole equivalence of backlight circuit 640a～640c.Then, set the second direct voltage Vcc2, owing to try to achieve the mode of equivalent voltage current function curved line relation to aforementioned similar, so do not give unnecessary details in addition at this according to equivalent voltage current function curved line relation.In addition, microcontroller 630 is according to a plurality of second electric current I cc2, Icc2 ' and Icc2 " equivalent current mean value and the equivalent current difference Idiff ' between the equivalent current predetermined value Itarget2 control voltage conversion circuit 610, to adjust the second direct voltage Vcc2.
Method of the present invention can specifically be implemented according to following mode, as: see through processor and carry out a software, see through pure hardware circuit, or see through both combinations.In the middle of, processor may be general usefulness or application specific processor, and this software comprises programmed logic, instruction and data, can realize the effect that the inventive method has when this software is performed.Wherein, this software can be stored in the computer readable media, as read-only memory, and random access memory, disk drive, CD-ROM device, fast flash memory bank or any other possible numerical digit storing media.Moreover method effect of the present invention also can see through the pure hardware circuit that includes hardware wired logic (hard-wired logic) and realize.
In sum, the inventive method can provide suitable direct voltage to give the backlight circuit accurately, make do not have too much voltage can be expended with other circuit that the backlight circuit is connected on, and, the present invention also can suitable adjusting be supplied to the direct voltage size of backlight circuit, particularly working as the backlight circuit is under the low relatively operating current, pressure drop on the backlight circuit is also lower comparatively speaking at this moment, so the present invention reduces the voltage supply of this moment, to reduce unnecessary power supply consume.Wherein, the present invention reaches identical technique effect through the mode of pure hardware circuit with the mode of microcontroller again.The mode of pure hardware circuit has the cost of less expensive, and the mode of microcontroller then can more accurately be fitted the operation of backlight circuit and be adjusted the direct voltage of being supplied.
The present invention is described by above-mentioned related embodiment, yet the foregoing description is only for implementing example of the present invention.Must be pointed out that the embodiment that has disclosed does not limit the scope of the invention.On the contrary, change of being done and retouching without departing from the spirit and scope of the present invention all belongs to scope of patent protection of the present invention.
Claims (11)
1. power control method, the power supply supply of at least one backlight circuit in order to the control display unit, it is characterized in that, this display unit has voltage conversion circuit, at least one regulating circuit, voltage detection circuit, debug comparison circuit and this backlight circuit, wherein this voltage conversion circuit is exported first direct voltage to this backlight circuit, to produce this backlight circuit and this regulating circuit that first electric current flows into series connection, this method comprises:
Utilize this voltage detection circuit to detect the operating voltage of this regulating circuit to draw detecting voltage;
Utilize this debug comparison circuit to calculate voltage difference between this detecting voltage and the predeterminated voltage; And
Control this voltage conversion circuit according to this voltage difference, to adjust this first direct voltage.
2. power control method as claimed in claim 1 is characterized in that, controls this voltage conversion circuit according to this voltage difference, includes with the step of adjusting this first direct voltage:
When this voltage difference during, end this voltage conversion circuit and export this first direct voltage greater than first predetermined value.
3. power control method as claimed in claim 1 is characterized in that, controls this voltage conversion circuit according to this voltage difference, includes with the step of adjusting this first direct voltage:
When this voltage difference during during greater than second predetermined value and less than first predetermined value, control this voltage conversion circuit and reduce this first direct voltage.
4. power control method as claimed in claim 1, it is characterized in that, this display unit has a plurality of these backlight circuit and a plurality of regulating circuit, and each backlight circuit is series at each regulating circuit, this first direct voltage is supplied to each backlight circuit respectively, to produce each backlight circuit and each regulating circuit that a plurality of first electric currents flow into series connection respectively, this power control method includes in addition:
Utilize this voltage detection circuit to detect the operating voltage of each regulating circuit respectively to draw detecting voltage corresponding to each regulating circuit; And
Utilize this debug comparison circuit to calculate a plurality of voltage differences between each detecting voltage and predeterminated voltage respectively.
5. power control method as claimed in claim 4 is characterized in that, controls this voltage conversion circuit according to this voltage difference, includes with the step of adjusting this first direct voltage:
Calculate the mean value of these a plurality of voltage differences;
When this mean value during during greater than second predetermined value and less than first predetermined value, control this voltage conversion circuit and reduce this first direct voltage; And
When in these a plurality of voltage differences at least one during, end this voltage conversion circuit and export this first direct voltage greater than this first predetermined value.
6. power control method as claimed in claim 1 is characterized in that this voltage conversion circuit has controller of pulse width modulation, and the step of adjusting this first direct voltage includes:
Controlling this controller of pulse width modulation adjusts this and controls this first direct voltage.
7. power control method, the power supply supply of at least one backlight circuit in order to the control display unit, it is characterized in that, this display unit has voltage conversion circuit, current-sensing circuit, this backlight circuit and microcontroller, wherein this voltage conversion circuit is exported first direct voltage to this backlight circuit, flow into this backlight circuit to produce first electric current, this method comprises:
Determine the electric current and voltage function curve relation of this backlight circuit;
Concern according to this electric current and voltage function curve and to set this first direct voltage;
Calculate electric current difference between this first electric current and the goal-selling electric current by this microcontroller; And
Control this voltage conversion circuit by this microcontroller according to this electric current difference, to adjust this first direct voltage.
8. power control method as claimed in claim 7 is characterized in that, determines the step of this electric current and voltage function curve relation of this backlight circuit to include:
Control this voltage conversion circuit and produce a plurality of test voltages to input to this backlight circuit;
Utilize this current-sensing circuit detect this backlight circuit according to this a plurality of test voltages a plurality of operating currents of generation respectively;
Decide this electric current and voltage function curve relation according to these a plurality of test voltages and these a plurality of operating currents.
9. power control method as claimed in claim 7 is characterized in that, concerns that according to this electric current and voltage function curve the step of setting this first direct voltage includes:
Decide target direct voltage required when making that this backlight circuit is kept this goal-selling electric current of output according to this goal-selling electric current and this electric current and voltage function curve relation; And
Utilize the value of this target direct voltage to set this first direct voltage.
10. power control method as claimed in claim 7 is characterized in that, controls this voltage conversion circuit according to this electric current difference, includes with the step of adjusting this first direct voltage:
When this electric current difference does not fall within first scope, adjust this first direct voltage by this voltage conversion circuit of this microprocessor controls.
11. power control method as claimed in claim 7, it is characterized in that, this display unit has a plurality of these backlight circuit, wherein this first direct voltage is supplied to this a plurality of these backlight circuit respectively, flow into these a plurality of these backlight circuit to produce a plurality of first electric currents, this power control method includes in addition:
Determine the pairing equivalent voltage current function of these a plurality of backlight circuit curved line relation;
Concern according to this equivalence electric current and voltage function curve and to set this first direct voltage;
Control this voltage conversion circuit by this microcontroller according to the equivalent current mean value of these a plurality of first electric currents and the equivalent current difference between this goal-selling electric current, to adjust this first direct voltage.
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| CN 201110039740 CN102159007A (en) | 2011-02-15 | 2011-02-15 | Power control method |
| CN201110274630.4A CN102354487B (en) | 2011-02-15 | 2011-09-16 | Method for controlling power supply and display device |
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| CN 201110039740 CN102159007A (en) | 2011-02-15 | 2011-02-15 | Power control method |
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| CN201110274630.4A Expired - Fee Related CN102354487B (en) | 2011-02-15 | 2011-09-16 | Method for controlling power supply and display device |
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| CN102332243A (en) * | 2011-09-16 | 2012-01-25 | 明基电通有限公司 | Power converter and relevant display system |
| CN103646633A (en) * | 2013-03-19 | 2014-03-19 | 明基电通有限公司 | Display device and method for display device to determine internal circuit operating bias |
| CN107885102A (en) * | 2016-09-29 | 2018-04-06 | 英业达科技有限公司 | Power supply supplies array system |
| CN113556848A (en) * | 2020-04-24 | 2021-10-26 | 中强光电股份有限公司 | Light emitting device and light generating method |
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| CN106782425B (en) * | 2017-03-30 | 2019-05-31 | 深圳市华星光电技术有限公司 | Input voltage rise time control circuit |
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| CN100538474C (en) * | 2006-11-28 | 2009-09-09 | 立锜科技股份有限公司 | Backlight control circuit |
| WO2008110990A1 (en) * | 2007-03-15 | 2008-09-18 | Philips Intellectual Property & Standards Gmbh | Driver circuit for loads such as led, oled or laser diodes |
| CN101572978B (en) * | 2008-04-29 | 2013-08-21 | 联咏科技股份有限公司 | Light emitting diode driving module |
| CN201286186Y (en) * | 2008-09-12 | 2009-08-05 | 南京天擎汽车电子有限公司 | Backlight regulator for automobile instrument |
-
2011
- 2011-02-15 CN CN 201110039740 patent/CN102159007A/en active Pending
- 2011-09-16 CN CN201110274630.4A patent/CN102354487B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332243A (en) * | 2011-09-16 | 2012-01-25 | 明基电通有限公司 | Power converter and relevant display system |
| CN103646633A (en) * | 2013-03-19 | 2014-03-19 | 明基电通有限公司 | Display device and method for display device to determine internal circuit operating bias |
| CN107885102A (en) * | 2016-09-29 | 2018-04-06 | 英业达科技有限公司 | Power supply supplies array system |
| CN107885102B (en) * | 2016-09-29 | 2020-06-16 | 英业达科技有限公司 | Power supply array system |
| CN113556848A (en) * | 2020-04-24 | 2021-10-26 | 中强光电股份有限公司 | Light emitting device and light generating method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102354487B (en) | 2014-02-12 |
| CN102354487A (en) | 2012-02-15 |
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