CN202160308U - Multicolor luminous element circuit - Google Patents
Multicolor luminous element circuit Download PDFInfo
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- CN202160308U CN202160308U CN2011202444282U CN201120244428U CN202160308U CN 202160308 U CN202160308 U CN 202160308U CN 2011202444282 U CN2011202444282 U CN 2011202444282U CN 201120244428 U CN201120244428 U CN 201120244428U CN 202160308 U CN202160308 U CN 202160308U
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Abstract
The utility model brings forward a multicolor luminous element circuit. The multicolor luminous element circuit comprises a plurality of luminous element strings with different colors, a sequential control circuit, a power supply adjusting circuit and a dark light feedback circuit. Each luminous element string comprises a plurality of luminous elements connected in a series manner. The number of the luminous elements in each luminous element string is determined by different voltage needed by the luminous elements with different colors. The luminous elements of at least two luminous element strings are different in number, so that the pressure drops of the two luminous element strings are close to each other when the luminous elements are the same in number, thereby increasing the switching speed of conduction and non-conduction of the luminous element strings.
Description
Technical field
The utility model relates to a kind of multicolor luminous element circuitry, is meant the light-emitting component quantity in a kind of light-emitting component string especially, the multicolor luminous element circuitry that can decide according to the required different voltages of different light-emitting components.
Background technology
In light-emitting diode (LED) projection display equipment; Wherein a kind of mode is the technology with RGB look circulation (color sequential); Cyclic transformation RGB LED conducting apace/not conducting and stabilization time (settling time) are able to watch the picture on the projection screen to make the user.And the LED projection display equipment of hand-hold type is as shown in Figure 1, generally takes to share a DC-DC power source regulating circuit 100 device is minimized and reduce manufacturing cost by RGB LED.In this kind prior art; When wherein a kind of color LED of needs RGB (being RLED, GLED or BLED) is luminous; Gate circuit 12 receives luminous signal R, G or B, with console switch 14, is supplied to the multicolor luminous element group 20 right-hand among the figure and select to supply voltage Vout; Simultaneously, transistor Q1, Q2, Q3 be this luminous signal R of basis, G or B also, so that in the multicolor luminous element group 20, the LED conducting of corresponding color.
In the prior art of Fig. 1, according to the selection of switch 14, and according to the cross-pressure on the sensing resistor Rs, or according to the node voltage of 2 of first resistance R 1 and second resistance R, and FEEDBACK CONTROL DC-DC power source regulating circuit 100 produces suitable output voltage V out.In detail, the LED of three kinds of colors of RGB, its operating voltage is also inequality.Generally speaking, white light LEDs, its operating voltage is about 3.2V-3.8V; Red-light LED, its operating voltage is about 1.9V-2.6V; Green light LED, its operating voltage is about 2.9V-3.7V; Blue-ray LED, its operating voltage is about 3.0V-3.8V.Among Fig. 1, suppose that ruddiness RLED operating voltage is 2.3V; Green glow GLED operating voltage is 3.6V; Blue light BLED operating voltage for example is 3.6V.When three kinds of colors are dark entirely; Output voltage V out then secretly is connected under the shinny situation of wherein a kind of color from three kinds of colors if be set at 0V entirely, and output voltage V out must be increased to 2.3V or 3.6V from 0V; Its gap is quite big, will cause the slow excessively problem of circuit reaction speed.Therefore, be to dark-coloured position accurate (Dark level), for example a 3V are set between the 3.6V in the prior art at aforementioned operating voltage 2.3V; When three kinds of colors are dark entirely; Output voltage V out rests on this standard, so, secretly is connected entirely under the shinny situation of wherein a kind of color in three kinds of colors; The variation of output voltage V out is less, but the accelerating circuit reaction.When needing dead color (Dark) situation; Switch 14 is according to the output signal of gate circuit 12; Switching is connected to dark-coloured feedback circuit 13 (being made up of first resistance R 1 and second resistance R 2), makes the neither conducting of all colours LED, and suitably arranges the resistance of first resistance R 1 and second resistance R 2; Make supply voltage Vout be controlled in aforementioned operating voltage 2.3V, for example 3V between the 3.6V.
Supply voltage Vout waveform so that upper type was produced is for example as shown in Figure 2; Though making three kinds of colors secretly be connected the output voltage gap of wherein a kind of color between shinny entirely, it dwindles; But between the conversion of ruddiness RLED and other dichromatism LED; The output voltage gap still can reach 1.3V (if each string LED is connected in series the more LED of more number, then gap is bigger), just can reach correct operating voltage in the reasonable time that the charge/discharge of output capacitance C1 still needing in this process; So will make the time of color conversion elongated, and reduce the image contrast, that is the reaction speed of circuit is still difficult satisfactory.
If do not share the DC-DC power source regulating circuit, and supply power with different DC-DC power source regulating circuits respectively, though but head it off is obviously also uneconomical to the LED of each color.Therefore, be necessary to propose a kind of very simplify on the hardware, more efficient multicolor luminous element circuitry in the cost utilization.
Because the above, the utility model promptly to the deficiency of prior art, proposes a kind of multicolor luminous element circuitry.
Summary of the invention
The purpose of the utility model is to overcome the deficiency and the defective of prior art; A kind of multicolor luminous element circuitry is proposed; Wherein, the light-emitting component quantity of light-emitting component string, the multicolor luminous element circuitry that can decide according to the required different voltages of different light-emitting components; Increasing the range of application of multicolor luminous element circuitry, and simplify existing light-emitting component Circuit Design.
For reaching above-mentioned purpose; The utility model provides a kind of multicolor luminous element circuitry, comprises: the light-emitting component string that a plurality of colors are different, one of which end are connected in a common node; To receive a supply voltage; And each light-emitting component string comprises the light-emitting component that a plurality of colors are identical, connects with series system, and wherein each light-emitting component string produces the sensing signal of a correspondence; Sequential control circuit according to an input signal, and is selected the different light-emitting component string of these a plurality of colors of conducting one of them or not conductings; One power source regulating circuit; When different one of them conducting of light-emitting component string of these a plurality of colors, in order to receive the sensing signal corresponding, with reference signal comparison with the light-emitting component string of this conducting; And, convert an input voltage into this supply voltage according to comparative result; Wherein, Light-emitting component quantity in the said light-emitting component string; The different voltages required according to the different colours light-emitting component decide, and wherein the light-emitting component quantity at least two light-emitting component strings differs from one another, so that the pressure drop of this two light-emitting components string is more approaching when identical than light-emitting component quantity.
In a kind of therein preferable enforcement kenel; Above-mentioned multicolor luminous element circuitry should more comprise: a dark-coloured feedback circuit, and for producing a dark-coloured feedback signal, and when the different light-emitting component string of these a plurality of colors during not conducting; This power source regulating circuit receives should the dead color feedback signal; Compare with this reference signal, and, convert this input voltage into this supply voltage according to comparative result.
In another preferable enforcement kenel; Above-mentioned multicolor luminous element circuitry should more comprise: a dark-coloured feedback circuit, and for producing a dark-coloured feedback signal, and when the different light-emitting component string of these a plurality of colors during not conducting; This power source regulating circuit receives should the dead color feedback signal; Compare with a dark-coloured reference signal, and, convert this input voltage into this supply voltage according to comparative result.
In wherein a kind of execution mode of above-mentioned multicolor luminous element circuitry, this dead color feedback circuit keeps conducting.
In another preferable enforcement kenel, multicolor luminous element circuitry should more comprise one and share sensing resistor, couples with each light-emitting component string, so that this sensing signal to be provided.
In another preferable enforcement kenel, multicolor luminous element circuitry should more comprise a plurality of sensing resistor, couples with each light-emitting component string respectively, so that the sensing signal corresponding with the light-emitting component string of conducting to be provided.
In the multicolor luminous element circuitry in above-mentioned, multicolor luminous element circuitry should more comprise one and select circuit, is respectively coupled to corresponding nodes with each light-emitting component string, to obtain the sensing signal corresponding with each light-emitting component string, selects this power source regulating circuit of input.
In the aforesaid multicolor luminous element circuitry; Multicolor luminous element circuitry preferably more comprises one and selects circuit, receives a plurality of color reference signals, and according to the selected light-emitting component string of this sequential control circuit; And select the color reference signal corresponding with selected light-emitting component string, as this reference signal.
In wherein a kind of execution mode of aforementioned multicolor luminous element circuitry; Multicolor luminous element circuitry more comprises a dark-coloured feedback circuit; For producing a dark-coloured feedback signal, and one select circuit, with each light-emitting component string and should be respectively coupled to corresponding nodes by the dead color feedback circuit; To obtain the sensing signal corresponding or should the dead color feedback signal, select this power source regulating circuit of input with each light-emitting component string.
In the above-mentioned multicolor luminous element circuitry, this selection circuit should be selected from one of following circuit: maximum voltage selects circuit, minimum voltage to select circuit, be controlled by the selection of sequential control circuit and the selection circuit selected.
Explain in detail through specific embodiment below, when the purpose that is easier to understand the utility model, technology contents, characteristics and the effect reached thereof.
Description of drawings
Fig. 1 shows the LED projection display equipment control circuit sketch map of hand-hold type;
Fig. 2 shows the supply voltage Vout waveform of prior art;
Fig. 3 A and 3B show first embodiment of the utility model;
Fig. 4 A and 4B show second embodiment of the utility model;
Fig. 5 A and 5B show the 3rd embodiment of the utility model;
Fig. 6 A and 6B show fourth, fifth embodiment of the utility model; Fig. 6 C shows the oscillogram of its sequential controlling signal for example;
Fig. 7 shows the 6th embodiment of the utility model;
Fig. 8 shows the 7th embodiment of the utility model;
Fig. 9 shows the 8th embodiment of the utility model;
Figure 10 shows the 9th embodiment of the utility model;
Figure 11 shows the tenth embodiment of the utility model;
Figure 12 shows the 11 embodiment of the utility model;
Figure 13 shows in the utility model, regulates the embodiment more specifically of control circuit 40;
Figure 13 A-13H shows the various embodiments of power stage 10 for example.
Symbol description among the figure
10 power stages
11 anti-gate circuits
12 gate circuits
13 dark-coloured feedback circuits
14 switches
15 first select circuit
17 second select circuit
18 minimum voltages are selected circuit
19 maximum voltages are selected circuit
20,30 multicolor luminous element groups
40 regulate control circuit
50 sequential control circuits
56 gate circuits
100 power source regulating circuits
200 power source regulating circuits
2T, the 3T ON time
The C1 output capacitance
Dark is dark-coloured
The Input input signal
INR, ING, INB, IND, OUT pin
Q1, Q2, Q3 transistor
R, G, the luminous signal of B
RLED, GLED, BLED color LED
R1 first resistance
R2 second resistance
The Rs sensing resistor
SB, SG, SR color switch
The dark-coloured switch of SD
The dark-coloured switch signal of TD
TB, TG, TR polychrome switch signal
The Vc controlling signal
Vout supplies voltage
The Vref reference signal
Vref_RGB polychrome reference signal
The red reference signal of Vref_R
The green reference signal of Vref_G
The blue reference signal of Vref_B
The dark-coloured reference signal of Vref_dark
Vs sensing signal
Embodiment
In following examples, " multicolor luminous element " is to be example with the RGB three-color LED, but the invention is not restricted to be applied in the LED of three kinds of colors of RGB, also can be applicable to the light-emitting component of other color or form.The present invention will control the circuit of multicolor luminous element, be called " multicolor luminous element controling circuit ", comprise the circuit of multicolor luminous element and its control circuit, be called " multicolor luminous element circuitry ".
Please refer to Fig. 3 A and 3B, show first embodiment of the utility model.Shown in Fig. 3 A, multicolor luminous element circuitry comprises: power source regulating circuit 200 (comprise power stage 10 and regulate control circuit 40), sequential control circuit 50, dark-coloured feedback circuit 13, multicolor luminous element group 30 and sensing resistor Rs; Among the figure; Gate circuit 56 and switches set can be regarded as (comprising color switch S R, SG, SB and dark-coloured switch S D) some of sequential control circuit 50; But among the figure when representing that light-emitting component of all kinds and dark-coloured position are accurate controlled to each other relation; Therefore especially separately illustrate; That is sequential control circuit 50 control selects the light-emitting component of a kind of color wherein shinny and to select the sensing signal Vs that this color is corresponding to send the light-emitting component of regulating control circuit 40 or selecting all colours to shinny and the dark-coloured feedback signal that dark-coloured feedback circuit 13 is produced sent to as sensing signal Vs regulate control circuit 40.The purpose of color switch S R, SG or SB is to control in regular turn that respectively to go here and there LED shinny, and its position is not limited to as shown in the figure; As long as can select the corresponding light-emitting component string of whether conducting with color switch S R, SG or SB, get final product.The position of dark-coloured switch S D also is not limited to as shown in the figure; For example, also can dark-coloured switch S D be arranged to the form like Fig. 1, or be arranged in the upper end of first resistance R 1 or the right-hand member of second resistance R 2, or the like, in a word,, get final product as long as can select the dark-coloured feedback circuit 13 of whether conducting with dark-coloured switch S D.Again, as not think that dark-coloured position need be provided is accurate, then can not need be provided with dark-coloured feedback circuit 13, gate circuit 56, with dark-coloured switch S D.
Multicolor luminous element group 30 comprises the different light-emitting component string of a plurality of colors, such as but not limited to the light-emitting component string that is in series by ruddiness RLED, green glow GLED or blue light BLED respectively.Each light-emitting component string comprises first end, is connected in common node, to receive supply voltage Vout; And second end, coupling with sensing resistor Rs via color switch S R, SG or SB respectively, the sensing resistor Rs other end then is coupled to earthing potential.The purpose of sensing resistor Rs is to obtain the current information of light-emitting component string as the sensing signal, with FEEDBACK CONTROL power stage 10, converts input voltage vin into suitable output voltage V out.
Among the present invention, consider that the operating voltage of each color LED is different; Just its operating voltage of ruddiness RLED for example is 2.3V; Its operating voltage of green glow GLED for example is 3.6V; Its operating voltage of blue light BLED for example also is 3.6V, therefore, decides in each light-emitting component string according to the required different voltages of different colours different light-emitting components, and the light-emitting component quantity of series connection is so that the pressure drop of each light-emitting component string is approximate.
In detail, shown in Fig. 3 A, such as but not limited to 3 ruddiness RLED series connection are ruddiness RLED string; 2 green glow GLED series connection is green glow GLED string; And 2 blue light BLED series connection gone here and there for blue light BLED.Just the summation operating voltage of ruddiness RLED string is 3*2.3V=6.9V, and the summation operating voltage of green glow GLED string is 2*3.6V=7.2V, and the summation operating voltage of blue light BLED string is 2*3.6V=7.2V.So, compared with prior art, the pressure reduction of summation operating voltage is reduced to 0.3V from 1.3V between the ruddiness RLED of present embodiment string and blue light BLED string.Therefore, when between different colours (comprising dead color), switching, the voltage difference of supply voltage Vout significantly lowers, thereby reduces the time of the charge/discharge of output capacitance C1, and this will make the time of color conversion shorten, and improve the image contrast.
In the multicolor luminous element circuitry, an end of dark-coloured feedback circuit 13 also couples with this common node, to receive supply voltage Vout; The other end of dark-coloured feedback circuit 13 is coupled to earthing potential via sensing resistor Rs.Dark-coloured feedback circuit 13 comprises a bleeder circuit, is made up of first resistance R 1 that couples each other and 2 of second resistance R.The resistance of first resistance R 1 and second resistance R 2 should be passed through suitably design; Make when the neither conducting of dark-coloured switch S D conducting (that is other color switch S R, SG, SB); Between the summation operating voltage that the summation operating voltage that the position of supply voltage Vout is accurate drops on ruddiness RLED string and blue light BLED go here and there, in the present embodiment promptly between 6.9V and 7.2V.
Too high for avoiding supplying voltage Vout, excess voltage protection can be set, to increase the fail safe of multicolor luminous element circuitry; Its circuit implementation method is identical with the circuit implementation method that has now in multicolor luminous element circuitry, does not repeat them here.
Fig. 3 B shows in the present embodiment for example, polychrome SECO signal TR, TG, TB, with the contingent oscillogram of dark-coloured SECO signal TD.Suppose need make in certain picture the brightness of each color approaching, then can control with ruddiness RLED string, green glow GLED string, with the ON time ratio of blue light BLED string, control ratio is about 2: 3: 3, such as 2T and 3T among the figure signal.And when ruddiness RLED string, green glow GLED string, when going here and there neither conducting with blue light BLED, the dark-coloured switch S D of then dark-coloured SECO signal TD conducting.Certainly, if picture needs each color that different brightness is arranged, then can control the shinny time of each light-emitting component string according to ratio.
Fig. 4 A and 4B show second embodiment of the utility model.Different with first embodiment is; The multicolor luminous element circuitry of present embodiment; More comprise first and select circuit 15; Can select turn-on of colors switch S R, SG, SB according to sequential control circuit 50, or select the dark-coloured switch S D of conducting, and select different reference signal inputs to regulate the comparison other of control circuit 40 as sensing signal Vs.That is; When sequential control circuit 50 is selected turn-on of colors switch S R, SG or SB; First selects circuit 15 to select polychrome reference signal Vref_RGB when sequential control circuit 50 is selected conducting dead color switch S D, and first selects circuit 15 to select dark-coloured reference signal Vref_Dark.Different reference signal can make the control of supply voltage Vout more accurate, or increases the elasticity of circuit design (for example the resistance of resistance R 1, R2, Rs is set).
Fig. 4 B is different with Fig. 3 B, is intended to show for example, when picture needs each color that different brightness is arranged, can control the shinny time of each light-emitting component string according to ratio.
Fig. 5 A and 5B show the 3rd embodiment of the utility model.Different with second embodiment is; The multicolor luminous element circuitry of present embodiment; Comprise second and select circuit 17; Can select turn-on of colors switch S R, SG, SB according to sequential control circuit 50, or select the dark-coloured switch S D of conducting, and select different reference signal inputs to regulate the comparison other of control circuit 40 as sensing signal Vs.That is when sequential control circuit 50 was selected turn-on of colors switch S R, second selected circuit 17 to select red reference signal Vref_R; When sequential control circuit 50 was selected turn-on of colors switch S G, second selected circuit 17 to select green reference signal Vref_G; When sequential control circuit 50 was selected turn-on of colors switch S B, second selected circuit 17 to select blue reference signal Vref_B; When sequential control circuit 50 was selected conducting dead color switch S D, second selected circuit 17 to select dark-coloured reference signal Vref_Dark.In the present embodiment; Different reference signal is more accurate except the control that can make supply voltage Vout; Or increase outside the elasticity of circuit design (for example the resistance of resistance R 1, R2, Rs is set); More can be through the setting of reference signal Vref_R of all kinds, Vref_G, Vref_B, make light-emitting component string of all kinds under identical ON time, brightness is identical, and must be by means of the shinny time scale of control.But certainly, as desire to control the brightness of light-emitting component string of all kinds, also still belong to feasible according to time scale.Fig. 5 B is intended to show that for example the shinny time of each light-emitting component string must not be aforesaid 2: 3: 3.
Fig. 6 A and 6B show fourth, fifth embodiment of the utility model.Different with first embodiment is; The multicolor luminous element circuitry of these two embodiment; Comprise a plurality of sensing resistor RsR, RsG and RsB, correspondingly respectively be coupled to corresponding color switch S R, SG and SB, and each sensing resistor RsR, RsG, with the resistance of RsB; Can be set at identical or different value respectively, for example can set according to the required electric current of each light-emitting component string; And second select circuit 17, can select turn-on of colors switch S R, SG, SB according to sequential control circuit 50, or select the dark-coloured switch S D of conducting, and select different sensing signal Vs inputs to regulate control circuit 40 comparison other of signal Vref as a reference.That is when sequential control circuit 50 was selected turn-on of colors switch S R, the cross-pressure that the second selection circuit 17 is selected sensing resistor RsR was as sensing signal Vs; When sequential control circuit 50 was selected turn-on of colors switch S G, the cross-pressure that the second selection circuit 17 is selected sensing resistor RsG was as sensing signal Vs; When sequential control circuit 50 was selected turn-on of colors switch S B, the cross-pressure that the second selection circuit 17 is selected sensing resistor RsB was as sensing signal Vs; When sequential control circuit 50 was selected conducting dead color switch S D, the cross-pressure that the second selection circuit 17 is selected second resistance R 2 was as sensing signal Vs.In the present embodiment; Different sensing signal Vs can make the control of supply voltage Vout more accurate; Or increase the elasticity of circuit design, and in addition, more can pass through each sensing resistor RsR, RsG, and the setting of RsB; Make light-emitting component string of all kinds under identical ON time, brightness is identical, and must be by means of the shinny time scale of control.(but certainly, as desire to control the brightness of light-emitting component string of all kinds, also still belong to feasible according to time scale.)
Fig. 6 B embodiment is similar with Fig. 6 A embodiment, only is the node that wherein will get the sensing signal from light-emitting component string of all kinds, changes the upper end (electric current flows into end) of taking from each color switch S R, SG, SB into, but not takes from its lower end (electric current outflow end).
Again, omitted dark-coloured switch S D among Fig. 6 A and the 6B embodiment, therefore will keep conducting through the path of dark-coloured feedback circuit 13 (comprising first resistance R 1 and second resistance R 2) ground connection, but this has not influenced the operation of integrated circuit from common node (Vout).Basically; Integrated circuit will select circuit 17 selected sensing signal Vs to come the operation of power controlling level 10 to produce suitable supply voltage Vout according to second; Only be when ruddiness RLED string, green glow GLED string or the conducting of blue light BLED string are shinny; Can on the path of first resistance R 1 and second resistance R, 2 formations, small leakage current be arranged, but this influence of leakage current is little.
Fig. 6 C is intended to show that for example the shinny time of each light-emitting component string must not be aforesaid 2: 3: 3.More than explanation; Though the light-emitting component number of light-emitting component string of all kinds is incomplete same; But still can make the brightness of light-emitting component string of all kinds identical, its control mode can by means of control ON time, to give different reference signal position accurate or use the sensing resistor of different resistances.
Fig. 7 shows the 6th embodiment of the utility model.In the present embodiment, sensing signal Vs and reference signal Vref can select, so that the control of supply voltage Vout is more accurate, the elasticity and/or the convenient brightness of controlling light-emitting component string of all kinds of increase circuit design.
Fig. 8 shows the 7th embodiment of the utility model.Present embodiment is that Fig. 7 embodiment is similar, but wherein will get the node of sensing signal from light-emitting component string of all kinds, changes the upper end (electric current flows into end) of taking from each color switch S R, SG, SB into, but not takes from its lower end (electric current outflow end).
Fig. 9 shows the 8th embodiment of the utility model.Present embodiment is similar with the 3rd embodiment (Fig. 5 A); But different with it is; The dark-coloured switch S D of present embodiment is coupled to and regulates between control circuit 40 and the sensing resistor Rs, and the polychrome switch signal TR that produces according to input signal Input by sequential control circuit 50, TG, with TB again via after gate circuit 56 processing, produce dark-coloured SECO signal TD; Through the conversion of anti-gate circuit 11, the signal that is produced is controlled.In detail; When polychrome SECO signal TR, TG, TB make arbitrary color switch S R, SG, SB conducting, also conducting of dark-coloured switch S D, so sensing signal Vs will be by sensing resistor Rs and 2 both the parallelly connected decisions of second resistance R; Because sensing resistor Rs resistance is much smaller than the resistance of first resistance R 1 and second resistance R 2; Therefore sensing signal Vs approximates the cross-pressure on the sensing resistor Rs, and the FEEDBACK CONTROL power stage 10 according to this, produce the required supply voltage Vout of selected light-emitting component string.Aspect in addition, as polychrome SECO signal TR, TG, when TB makes color switch S R, SG, the neither conducting of SB, also not conducting of dark-coloured switch S D, so sensing signal Vs will be the cross-pressure on second resistance R 2, therefore produce the dark-coloured accurate supply voltage Vout in position.
Figure 10 shows the 9th embodiment of the utility model.Present embodiment is similar with Fig. 8 embodiment, but different with it be that second of Fig. 8 embodiment selects circuit 17; Select circuit 18 to replace with minimum voltage, second end and second resistance R 2 of itself and each light-emitting component string couple, and from each second terminal voltage and the second ohmically pressure drop; Respectively by pin INR, ING, INB, receive with IND; Therefrom select a minimum voltage, by pin OUT output, with as sensing signal Vs.In detail; When polychrome SECO signal TR, TG, TB made arbitrary color switch S R, SG, SB conducting, the light-emitting component string of conducting was not because of no current, and the pressure drop of light-emitting component is lower; So its second corresponding terminal voltage will be than approaching supply voltage Vout; Also even suitably design the resistance of first resistance R 1, second resistance R 2 and each sensing resistor RsR, RsG, RsB, the light-emitting component string that can make conducting, its second corresponding terminal voltage is minimum; Determining suitable sensing signal Vs, and FEEDBACK CONTROL produces suitable supply voltage Vout.
Figure 11 shows the tenth embodiment of the utility model.Present embodiment is similar with Fig. 7 embodiment, selects circuit 15 but be provided with first, and another different with it is; Second of Fig. 7 embodiment selects circuit 17, selects circuit 19 to replace with maximum voltage, couples with each sensing resistor RsR, RsG, RsB and second resistance R 2; And from each sensing resistor RsR, RsG and RsB; And second the pressure drop on the resistance R 2, select wherein maximum voltage, with as sensing signal Vs.In detail; When polychrome SECO signal TR, TG, TB make arbitrary color switch S R, SG, SB conducting, the light-emitting component string of conducting not, the voltage on its corresponding sensing resistor will be zero; That is the light-emitting component string of conducting; Voltage on its corresponding sensing resistor is for the highest, and as sensing signal Vs, and FEEDBACK CONTROL produces suitable supply voltage Vout with this.
Figure 12 shows the 11 embodiment of the utility model.Different with the tenth embodiment is, present embodiment more comprises above-mentioned first and selects circuit 15, and it selects polychrome reference signal Vref_RGB or dark-coloured reference signal Vref_Dark according to the output of sequential control circuit 50, with signal Vref as a reference.In the embodiment of Figure 11 and 12, be provided with dark-coloured switch S D again.
More than among each embodiment; As not think that dark-coloured position need be provided is accurate; Dark-coloured feedback circuit 13, gate circuit 56, dark-coloured switch S D then can not need be set, and respectively select also the selection that corresponds to dark-coloured feedback circuit 13 need be provided in the circuit 15,17,18,19.
Below to preferred embodiment the utility model is described, just the above is merely the content that makes those skilled in the art be easy to understand the utility model, is not the interest field that is used for limiting the utility model.Under the same spirit of the utility model, those skilled in the art can think and various equivalence changes.For example, shown among each embodiment, each light-emitting component string; The light-emitting component quantity of series connection is not limited to 3 series connection of ruddiness RLED as shown in the figure, and each 2 of green glow GLED and blue light BLED connect; LED series connection that can other quantity is like ruddiness RLED11 connect (11*2.3V=25.3V); Green glow GLED and blue light BLED each 7 connect (7*3.6V=25.2V) etc.; Again for example, shown in each embodiment circuit, can insert the element that does not influence the main meaning of signal, like other switch etc.; For example under some framework, output voltage V out is a negative voltage again, and light-emitting component then is reversal connection, and this moment, circuit should be made corresponding change; Again for example, in some embodiment (for example Fig. 3 A, 4A, 5A), second resistance R 2 can be omitted; Again for example, in Fig. 7,8,10,12 for example, first selects circuit 15 also can change the selection circuit of four inputs into, chooses one as reference signal Vref among self-reference signal Vref_R, Vref_G, Vref_B, the dark-coloured reference signal Vref_Dark, or the like.Therefore, all various equivalences change, and all should be included within the scope of the utility model.
Claims (10)
1. a multicolor luminous element circuitry is characterized in that, comprises:
The light-emitting component string that a plurality of colors are different; The one of which end is connected in a common node, supply voltage to receive one, and each light-emitting component string comprises the light-emitting component that a plurality of colors are identical; Connect with series system, wherein each light-emitting component string produces the sensing signal of a correspondence;
Sequential control circuit according to an input signal, and is selected the different light-emitting component string of these a plurality of colors of conducting one of them or not conductings;
One power source regulating circuit; When different one of them conducting of light-emitting component string of these a plurality of colors, in order to receive the sensing signal corresponding, with reference signal comparison with the light-emitting component string of this conducting; And, convert an input voltage into this supply voltage according to comparative result;
Wherein, Light-emitting component quantity in the said light-emitting component string; The different voltages required according to the different colours light-emitting component decide, and wherein the light-emitting component quantity at least two light-emitting component strings differs from one another, so that the pressure drop of this two light-emitting components string is more approaching when identical than light-emitting component quantity.
2. multicolor luminous element circuitry as claimed in claim 1 is characterized in that, also comprises: a dark-coloured feedback circuit; For producing a dark-coloured feedback signal; And when the different light-emitting component string of these a plurality of colors during not conducting, this power source regulating circuit receives should the dead color feedback signal, with this reference signal relatively; And, convert this input voltage into this supply voltage according to comparative result.
3. multicolor luminous element circuitry as claimed in claim 1 is characterized in that, also comprises: a dark-coloured feedback circuit; For producing a dark-coloured feedback signal; And when the different light-emitting component string of these a plurality of colors during not conducting, this power source regulating circuit receives should the dead color feedback signal, with a dark-coloured reference signal relatively; And, convert this input voltage into this supply voltage according to comparative result.
4. like claim 2 or 3 described multicolor luminous element circuitry, it is characterized in that this dead color feedback circuit keeps conducting.
5. multicolor luminous element circuitry as claimed in claim 1 is characterized in that, also comprises one and shares sensing resistor, couples with each light-emitting component string, so that this sensing signal to be provided.
6. multicolor luminous element circuitry as claimed in claim 1 is characterized in that, also comprises a plurality of sensing resistor, couples with each light-emitting component string respectively, so that the sensing signal corresponding with the light-emitting component string of conducting to be provided.
7. like claim 1,5 or 6 described multicolor luminous element circuitry; It is characterized in that; Also comprise one and select circuit, receive a plurality of color reference signals, and according to the selected light-emitting component string of this sequential control circuit; And select the color reference signal corresponding with selected light-emitting component string, as this reference signal.
8. multicolor luminous element circuitry as claimed in claim 6 is characterized in that, also comprises one and selects circuit, is respectively coupled to corresponding nodes with each light-emitting component string, to obtain the sensing signal corresponding with each light-emitting component string, selects this power source regulating circuit of input.
9. multicolor luminous element circuitry as claimed in claim 6 is characterized in that, also comprises:
One dark-coloured feedback circuit, for generation one dark-coloured feedback signal, and
One selects circuit, with each light-emitting component string and should be respectively coupled to corresponding nodes by the dead color feedback circuit, to obtain the sensing signal corresponding with each light-emitting component string or should the dead color feedback signal, selects one and imports this power source regulating circuit.
10. like claim 8 or 9 described multicolor luminous element circuitry; It is characterized in that this selection circuit is selected from one of following circuit: maximum voltage selects circuit, minimum voltage to select circuit, be controlled by the selection of sequential control circuit and the selection circuit selected.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US36876910P | 2010-07-29 | 2010-07-29 | |
| US61/368,769 | 2010-07-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202160308U true CN202160308U (en) | 2012-03-07 |
Family
ID=45767928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202444282U Expired - Lifetime CN202160308U (en) | 2010-07-29 | 2011-07-06 | Multicolor luminous element circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN202160308U (en) |
| TW (1) | TWM417740U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021179523A (en) * | 2020-05-11 | 2021-11-18 | 深▲せん▼市艾比森光電股▲ふん▼有限公司Shenzhen Absen Optoelectronic Co., Ltd. | LED display driven by negative voltage dual voltage power supply |
| US11862076B2 (en) | 2022-03-07 | 2024-01-02 | AUO Corporation | Light-emitting diode display module |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102571007B (en) * | 2012-01-09 | 2014-10-15 | 电子科技大学 | Operation amplifier with minimum potential selection function |
| TWI478620B (en) | 2012-12-17 | 2015-03-21 | Power Forest Technology Corp | Light emitting diode backlight system the driving apparatus and driving method thereof |
-
2011
- 2011-06-22 TW TW100211353U patent/TWM417740U/en not_active IP Right Cessation
- 2011-07-06 CN CN2011202444282U patent/CN202160308U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021179523A (en) * | 2020-05-11 | 2021-11-18 | 深▲せん▼市艾比森光電股▲ふん▼有限公司Shenzhen Absen Optoelectronic Co., Ltd. | LED display driven by negative voltage dual voltage power supply |
| JP7136833B2 (en) | 2020-05-11 | 2022-09-13 | 深▲せん▼市艾比森光電股▲ふん▼有限公司 | LED display driven by negative voltage dual voltage power supply |
| US11561591B2 (en) | 2020-05-11 | 2023-01-24 | Shenzhen Absen Optoelectronic Co., Ltd. | LED display driven by dual-negative-voltage power supply |
| US11862076B2 (en) | 2022-03-07 | 2024-01-02 | AUO Corporation | Light-emitting diode display module |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM417740U (en) | 2011-12-01 |
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