CN102045912A - Color modulating system and method - Google Patents
Color modulating system and method Download PDFInfo
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- CN102045912A CN102045912A CN2009102058311A CN200910205831A CN102045912A CN 102045912 A CN102045912 A CN 102045912A CN 2009102058311 A CN2009102058311 A CN 2009102058311A CN 200910205831 A CN200910205831 A CN 200910205831A CN 102045912 A CN102045912 A CN 102045912A
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Abstract
The invention provides a color modulating system and method. A first pulse width correction value and a second pulse width correction value can be calculated by sensing first color light and second color light which are emitted by a first color light-emitting element and a second color light-emitting element to correspondingly generate light intensity values, and further a first work cycle and a second work cycle of drive current can be modulated according to the first pulse width correction value and the second pulse width correction value so as to modulate the illumination brightness of the first color light-emitting element and the second color light-emitting element. With the modulation, the first color light and the second color light fall within the preset color temperature range, and thereby a light source with stable color temperature can be provided.
Description
Technical field
The present invention relates to a kind of color adjusting and changing system and modulating method thereof, and relate in particular to the color adjusting and changing system and the modulating method thereof of brightness and chrominance signal.
Background technology
(Light Emitting Diode is a cold light source LED) to light-emitting diode, has to save long characteristic of the energy, low, the quick startup of loss, no mercury and life-span.After the blue light-emitting diode technology barrier has been broken through at the twentieth century end, just develop light-emitting diode of all kinds that to send higher source luminance and vast being applied on the various products such as display, projector, lighting apparatus gradually.Therefore light-emitting diode is the light source that gets most of the attention at present, yet owing to be subject to the only single form and aspect that light-emitting diode sends, so need become a light emitting module by the LED integral that sends different form and aspect light sources, the light source of rich colors just can be provided.
General common combination is in conjunction with sending trichromatic light-emitting diodes such as red, blue, green, the light-emitting diode of these three kinds of colors being controlled the time and the brightness of its unlatching respectively again.But this control mode only designs at the characteristic of light-emitting diode under general situation, and can't solve after long-time the use, and light-emitting diode can influence the problem of brightness or colour temperature stability along with temperature or aging situation.Present solution is to increase to detect and the mechanism of feedbacking in control circuit, individually provide the drive unit of feedback signal according to the lumination of light emitting diode intensity that records, at any time its brightness of illumination is made corresponding modulation with present situation at light-emitting diode of all kinds to Tricolor LED.Yet, reach the modulation circuit that such mechanism need be used many photodetectors and need to use complexity, raise the cost on the contrary, produce new problem again.Other technology, as: in the U.S. Patent number 7397205 disclosed system architectures, need to use adjust the mode of size of current and carry out gamma correction, like this then work period that can the restricted part light-emitting diode, reduce whole luminous efficiency, also non-good countermeasure.
Therefore, still need a kind of meliorative modulation circuit at present, the versicolor light-emitting diode of energy fit applications is to address the above problem.
Summary of the invention
Purpose of the present invention drives the work period of the luminous drive current of the first look light-emitting component and the second look light-emitting component and then the brightness of illumination of at least one first look light-emitting component of modulation and at least one second look light-emitting component for modulation respectively.
Another object of the present invention makes its light that sends in predetermined reference color temperature, and provides colour temperature stable light source for modulation respectively drives work period of the luminous drive current of the first look light-emitting component and the second look light-emitting component.
A further object of the present invention is for using the coloured light of the multiple color of sensing cell sensing, providing intensity of light source value for color adjusting and changing, thereby reduces circuit complexity.
According to the present invention, a kind of color adjusting and changing system is provided, brightness of illumination according to a plurality of intensity of light source values difference at least one first look light-emitting components of modulation and at least one second look light-emitting component comprises: driver element, sensing cell, control unit and pulse-width modulation unit.Driver element produces first drive current and second drive current, first drive current comprised for first work period, second drive current comprised for second work period, driver element also drives the first look light-emitting component in first work period and sends first coloured light, sends second coloured light and drive the second look light-emitting component in second work period.Sensing cell then is that above-mentioned first coloured light and second coloured light of sensing produces intensity of light source value with correspondence respectively.Control unit can calculate the first pulsewidth corrected value and the second pulsewidth corrected value according to described a plurality of intensity of light source values, and the first pulsewidth corrected value is corresponding to the first look light-emitting component, and the second pulsewidth corrected value is then corresponding to the second look light-emitting component.Pulse-width modulation unit and then the foundation first pulsewidth corrected value and the second pulsewidth corrected value be first work period of modulation and second work period respectively.
According to the present invention, a kind of color adjusting and changing method is provided, brightness of illumination according to a plurality of intensity of light source values difference at least one first look light-emitting components of modulation and at least one second look light-emitting component, comprise the following steps: that (A) produces first drive current and second drive current, this first drive current comprised for first work period, and this second drive current comprised for second work period; (B) drive the first look light-emitting component in first work period and send first coloured light, send second coloured light and drive the second look light-emitting component in second work period; (C) sensing first coloured light and this second coloured light produce described a plurality of intensity of light source value with correspondence respectively; (D) according to intensity of light source value, calculate the first pulsewidth corrected value and the second pulsewidth corrected value, the first pulsewidth corrected value is corresponding to the first look light-emitting component, and the second pulsewidth corrected value is corresponding to the second look light-emitting component; And (E) according to the first pulsewidth corrected value and second pulsewidth corrected value difference first work period of modulation and second work period.
Hereat, via the first above-mentioned coloured light and second coloured light are carried out sensing corresponding produce intensity of light source value after, then can be by calculating the first pulsewidth corrected value and the second pulsewidth corrected value, and and then in view of the above first work period and second work period are carried out modulation, with the brightness of illumination of the modulation first look light-emitting component and the second look light-emitting component.Preferably, by above-mentioned modulation win coloured light and second coloured light are dropped in the predetermined reference color temperature, this predetermined reference color temperature can be set by user or manufacturer, and can provide colour temperature stable light source.In addition, in first work period and second work period, preferably can drive the first look light-emitting component and second look light-emitting component conducting scheduled current respectively, and modulation increases by first work period or second work period, thereby increasing the work period of the first look light-emitting component or the second look light-emitting component, more preferably is to reach more than 60% the work period that increases by the first look light-emitting component or the second look light-emitting component.
Description of drawings
Fig. 1 is the function block schematic diagram that illustrates the color adjusting and changing system of the embodiment of the invention.
Fig. 2 is the schematic diagram that illustrates the clock signal of the embodiment of the invention.
Fig. 3 is the flow chart of steps that illustrates the color adjusting and changing method of the embodiment of the invention.
Embodiment
For further specifying each embodiment, the present invention provides accompanying drawing.These a little accompanying drawings are the part for this creation disclosure, and it is mainly in order to explanation embodiment, and can cooperate the associated description of specification to explain the operation principles of embodiment.Cooperation is with reference to these contents, and those skilled in the art will be understood that execution mode and the advantage of the present invention that other are possible.Element among the figure and not drawn on scale, and the similar elements symbol is commonly used to represent similar elements.
At first please refer to Fig. 1, wherein Fig. 1 is the function block schematic diagram that illustrates the color adjusting and changing system of the embodiment of the invention.As shown in FIG., color adjusting and changing system 100 comprises driver element 10, memory cell 20, sensing cell 30, analog digital converting unit 40, control unit 50, clock sampling unit 60 and pulse-width modulation unit 70.In the present embodiment, color adjusting and changing system 100 has optionally comprised memory cell 20, analog digital converting unit 40 and clock sampling unit 60, yet optionally omit analog digital converting unit 40 and/or clock sampling unit 60 according to other embodiment of the present invention, perhaps the element equivalence with other quantity replaces.Color adjusting and changing system 100 can be according to the brightness of illumination of a plurality of intensity of light source values difference at least one first look light-emitting components of modulation and at least one second look light-emitting component, present embodiment is an example with the light-emitting diode of three kinds of colors exemplarily, as: red light emitting diodes 102, green LED 104 and blue LED 106.Color adjusting and changing system 100 is electrically connected with red light emitting diodes 102, green LED 104 and blue LED 106 respectively by driver element 10, between sensing cell 30 and control unit 50, be electrically connected with analog digital converting unit 40, control unit 50 also is electrically connected with clock sampling unit 60 and pulse-width modulation unit 70 respectively, and the output of clock sampling unit 60 and pulse-width modulation unit 70 then is electrically connected with driver element 10.
Can be when control unit 50 starts in color adjusting and changing system 100 according to a plurality of brightness reference value and a plurality of reference clock control clock sampling unit 60 or pulse-width modulation unit 70, described a plurality of brightness reference value and reference clock can be that user or producer set or are predetermined, can be stored among the memory cell that is electrically connected with control unit 50.Brightness reference value can according to the characteristic electron difference of applied luminescence unit of all kinds and user or producer color adjusting and changing system 100 is sent light source colour temperature standard and set or predetermined.For instance, in the present embodiment, the corresponding respectively color adjusting and changing of brightness reference value system 100 sends between predetermined reference color temperature, during as the light source in: the reference color temperature of 8500K ± 20%, the luminance intensity value that red light emitting diodes 102, green LED 104 and blue LED 106 need send.Thereafter the operating process that provides brightness reference value to continue to the control unit 50 and carry out can be provided in detail paragraph again.
After clock sampling unit 60 obtains above-mentioned reference clock, can produce a plurality of drive clock and a plurality of sampling clock and it is provided to driver element 10, make it produce a plurality of drive currents, drive current comprises the work period (Duty Cycle) respectively, in the work period, when providing the driving current potential that is higher than the conducting current potential during to light-emitting component, light-emitting component can conducting and luminous.Preferably, driver element 10 is with scheduled current conducting stably in the time of can driving red light emitting diodes 102, green LED 104 and blue LED 106 conductings in the work period, therefore so that stably colourity is luminous.In the present embodiment, driver element 10 can be different in response to the conducting current potential of red light emitting diodes 102, green LED 104 and blue LED 106, and producing corresponding drive current respectively to red light emitting diodes 102, green LED 104 and blue LED 106, red light emitting diodes 102 sends red light, green LED 104 sends green light and blue LED 106 sends blue light to drive.Described a plurality of work period makes that red light emitting diodes 102, green LED 104 and blue LED 106 are alternately luminous when preferably differing from one another.
On the other hand, can correspondingly produce intensity of light source value behind the light that sensing cell 30 sensing light-emitting components send.The sensing cell 30 of present embodiment is the wideband sensor, therefore sensing cell 30 only need be set finish sensing by time-sharing format light-emitting component issued light of all kinds, for instance, in first work period, red light emitting diodes 102 is actuated to send red light, the brightness of illumination of sensing cell 30 these red light of sensing is to obtain corresponding intensity of light source value at this moment, and in second work period, when green LED 104 was actuated to send green light, the brightness of illumination of 30 these green light of sensing of sensing cell was to obtain corresponding intensity of light source value.So repeatedly carry out sensing, make sensing cell 30 obtain the intensity of light source value of corresponding red light emitting diodes 102, green LED 104 and blue LED 106 respectively, and the intensity of light source value that these sensings obtain is sent to control unit 50 through analog digital converting unit 40.
Analog digital converting unit 40 only is to make stylistic transfer process at this, and the intensity of light source value of the analog format that sensing cell 30 is recorded is converted to number format.
After the intensity of light source value that control unit 50 obtains from sensing cell 30, can calculate a plurality of pulsewidth corrected values according to these intensity of light source value and/or brightness reference value.Described a plurality of pulsewidth corrected value corresponds respectively to red light emitting diodes 102, green LED 104 and blue LED 106.The formula that calculates the pulsewidth corrected value herein is also unrestricted, preferably relevant with the indivedual luminous efficiencies and/or the aforesaid predetermined reference color temperature of red light emitting diodes 102, green LED 104 and blue LED 106, luminous efficiency can be relevant with aforementioned scheduled current and intensity of light source value, and predetermined reference color temperature then can be relevant with brightness reference value.Therefore, the comparison that control unit 50 carries out intensity of light source value and brightness reference value with calculate after, difference that again will be therebetween is with the characteristic electron of pulsewidth corrected value, as: characteristics such as current potential, electric current, frequency, amplitude and/or time are represented, and the pulsewidth corrected value are sent to pulse-width modulation unit 70.
In order more to understand the start of pulse-width modulation unit 70, please in the lump with reference to figure 2, it is the schematic diagram that illustrates the clock signal of the embodiment of the invention at this.Behind the pulsewidth corrected value of pulse-width modulation unit 70 receptions from control unit 50, meeting is according to the high electric current pulsewidth (Pulse width) of the work period of the drive current of the corresponding red light emitting diodes 102 of pulsewidth corrected value difference modulation, green LED 104 and blue LED 106.By the demonstration example of Fig. 2, the operating process that describes in detail therebetween is as follows: in Fig. 2, transverse axis express time, the longitudinal axis are represented the brightness size, wherein the electronic signal T of Xian Shiing
R, T
GWith T
BCorrespond to the drive current of red light emitting diodes 102, green LED 104 and blue LED 106 respectively." the work period R that indicates among the figure
1" correspond to the work period of red light emitting diodes 102 when 100 startups of color adjusting and changing system, in other words, in the high electric current pulsewidth in work period R1, red light emitting diodes 102 can send red light, and " work period G
1" reach " work period B
1" correspond to respectively similarly green LED 104 and the work period of blue LED 106 when 100 startups of color adjusting and changing system.Sensing cell 30 red light emitting diodes 102, green LED 104 and blue LED 106 conductings luminous during in, as among the figure with the time point shown in the arrow, sensing obtains red light emitting diodes 102, green LED 104 and blue LED 106 luminous light source intensity levels respectively.
For the purpose of simplifying the description, avoid giving unnecessary details, the demonstration example of the start of pulse-width modulation unit 70 only is described with a minority work period at this.For red light emitting diodes 102, the pulsewidth corrected value modulation electronic signal T that 70 meetings of pulse-width modulation unit calculate according to control unit 50
RA between its costal field
RHigh electric current pulsewidth width, preferably increase high electric current pulsewidth width, the amplitude of its increase and pulsewidth corrected value are proportional.Give an example correspondence work period R at this
2A between costal field
RLow current all draw high and be high electric current, increase high electric current pulsewidth width and work period R after forming modulation with this
2Yet be not limited to this ratio or the high electric current pulsewidth of interval modulation width, as: also adjustable exchanging work made cycle R
2Posterior marginal zone between the pulsewidth width or carry out modulation with other ratios, but preferably the work period of modulation light-emitting component be greater than 60%, even can reach 100%.So driver element 10 is at corresponding work period R
2High electric current pulsewidth in, can drive red light emitting diodes 102 conductings and luminous, can learn intuitively that red light emitting diodes 102 fluorescent lifetimes increase, the also corresponding brightness of illumination that increases red light emitting diodes 102.For green LED 104 and blue LED 106 also is to carry out similar program, does not repeat them here.Through respectively red light emitting diodes 102, green LED 104 and blue LED 106 being carried out after the modulation, can make driver element 10 drive light that red light emitting diodes 102, green LED 104 and blue LED 106 send in aforesaid predetermined reference color temperature.
Other please refer to Fig. 3, and it is the flow chart of steps that illustrates the color adjusting and changing method of the embodiment of the invention.As shown in FIG., color adjusting and changing method comprises the following steps: that at first the clock sampling unit produces a plurality of drive clock according to a plurality of reference clocks, produces first drive current and second drive current for driver element.This first drive current comprised for first work period, and second drive current comprises second work period (step S310).Therefore, driver element is when first work period, can drive the first look light-emitting component and send first coloured light, send second coloured light and drive the second look light-emitting component in second work period, preferably drive the first look light-emitting component and second look light-emitting component difference conducting scheduled current in first work period and second work period, with this stable colourity (step S320).Thereafter, behind at least one sensing cell difference sensing first coloured light and second coloured light, a plurality of intensity of light source values of the corresponding generation of sensing cell provide to control unit (step S330).After the intensity of light source value of control unit acquisition from sensing cell, can calculate the first pulsewidth corrected value and the second pulsewidth corrected value according to these intensity of light source values and/or a plurality of brightness reference value.The first pulsewidth corrected value is corresponding to the first look light-emitting component, and the second pulsewidth corrected value is corresponding to the second look light-emitting component (step S340).Can comprise also that at this step changes the form of intensity of light source value, such as transmit again after will analog format originally being converted to number format.Afterwards, according to the first pulsewidth corrected value and the second pulsewidth corrected value, the pulse-width modulation unit is first work period of modulation and second work period (step S350) respectively, such as: the high electric current pulsewidth width that pulse-width modulation unit modulation increases by first work period or second work period makes its work period for greater than 60%, makes to win coloured light and second coloured light in predetermined reference color temperature.
Hereat, via the first above-mentioned coloured light and second coloured light are carried out sensing corresponding produce intensity of light source value after, then can be by calculating the first pulsewidth corrected value and the second pulsewidth corrected value, and and then in view of the above first work period and second work period are carried out modulation, with the brightness of illumination of the modulation first look light-emitting component and the second look light-emitting component.Preferably, by above-mentioned modulation win coloured light and second coloured light are dropped in the predetermined reference color temperature, this predetermined reference color temperature can be set by user or manufacturer, and can provide colour temperature stable light source.
More than narration is according to a plurality of different embodiment of the present invention, and wherein various features can single or different combinations be implemented.Therefore, the exposure of embodiment of the present invention is the specific embodiment of illustrating principle of the present invention, should be regardless of limit the present invention in the embodiment that is disclosed.Further it, before narrated and accompanying drawing only for the usefulness of the present invention's demonstration, be not limited.The variation of other element or combination be possibility all, and is not contrary in spirit of the present invention and scope.
Claims (12)
1. color adjusting and changing system according to a plurality of intensity of light source values brightness of illumination of at least one first look light-emitting components of modulation and at least one second look light-emitting component respectively, is characterized in that: comprising:
Driver element, produce first drive current and second drive current, described first drive current comprised for first work period, described second drive current comprised for second work period, described driver element also drives the described first look light-emitting component in described first work period and sends first coloured light, sends second coloured light and drive the described second look light-emitting component in described second work period;
Sensing cell, described first coloured light of sensing and described second coloured light produce described a plurality of intensity of light source value with correspondence respectively;
Control unit calculates the first pulsewidth corrected value and the second pulsewidth corrected value according to described a plurality of intensity of light source values, and the described first pulsewidth corrected value is corresponding to the described first look light-emitting component, and the described second pulsewidth corrected value is corresponding to the described second look light-emitting component; And
The pulse-width modulation unit is according to the described first pulsewidth corrected value and described second pulsewidth corrected value difference described first work period of modulation and described second work period.
2. color adjusting and changing as claimed in claim 1 system, it is characterized in that: described pulse-width modulation unit modulation increases the high electric current pulsewidth width of described first work period or described second work period.
3. color adjusting and changing as claimed in claim 2 system, it is characterized in that: the work period of described first look light-emitting component or the described second look light-emitting component is greater than 60%.
4. color adjusting and changing as claimed in claim 1 system, wherein, between the costal field of described first work period of described pulse-width modulation unit modulation or described second work period or the pulsewidth width between posterior marginal zone.
5. color adjusting and changing as claimed in claim 1 system, it is characterized in that: described pulse-width modulation unit is according to the described first pulsewidth corrected value and after described first pulsewidth corrected value difference described first work period of modulation and described second work period, and described first coloured light and described second coloured light are in predetermined reference color temperature.
6. color adjusting and changing as claimed in claim 1 system is characterized in that: also comprise the clock sampling unit, provide a plurality of drive clock to described driver element, produce described first drive current and described second drive current for described driver element.
7. color adjusting and changing as claimed in claim 6 system is characterized in that: described control unit also calculates described first pulsewidth corrected value and the described second pulsewidth corrected value according to a plurality of brightness reference value.
8. color adjusting and changing method according to a plurality of intensity of light source values brightness of illumination of at least one first look light-emitting components of modulation and at least one second look light-emitting component respectively, comprises the following steps:
(A) produce first drive current and second drive current, described first drive current comprised for first work period, and described second drive current comprised for second work period;
(B) drive the described first look light-emitting component in described first work period and send first coloured light, send second coloured light and drive the described second look light-emitting component in described second work period;
(C) described first coloured light of sensing and described second coloured light produce described a plurality of intensity of light source value with correspondence respectively;
(D) calculate the first pulsewidth corrected value and the second pulsewidth corrected value according to described a plurality of intensity of light source values, the described first pulsewidth corrected value is corresponding to the described first look light-emitting component, and the described second pulsewidth corrected value is corresponding to the described second look light-emitting component; And
(E) according to the described first pulsewidth corrected value and described second pulsewidth corrected value difference described first work period of modulation and described second work period.
9. color adjusting and changing method as claimed in claim 8 is characterized in that: described step (E) comprises that also modulation increases the high electric current pulsewidth width of described first work period or described second work period.
10. color adjusting and changing method as claimed in claim 9 is characterized in that: described step (E) comprises that also the work period that increases described first look light-emitting component or the described second look light-emitting component is greater than 60%.
11. color adjusting and changing method as claimed in claim 8, wherein said step (E) also comprise between the costal field of described first work period of modulation or described second work period or the pulsewidth width between posterior marginal zone.
12. color adjusting and changing method as claimed in claim 8 is characterized in that: described step (E) also comprise described first work period of modulation and described second work period so that described first coloured light and described second coloured light in predetermined reference color temperature.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103841721A (en) * | 2012-11-20 | 2014-06-04 | 亚硕绿能股份有限公司 | LED module correction system and correction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103841721A (en) * | 2012-11-20 | 2014-06-04 | 亚硕绿能股份有限公司 | LED module correction system and correction method thereof |
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Application publication date: 20110504 |