CN103514838B - The apparatus and method of multicolor backlight are realized by two wires transmission driving method - Google Patents
The apparatus and method of multicolor backlight are realized by two wires transmission driving method Download PDFInfo
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- CN103514838B CN103514838B CN201210226409.6A CN201210226409A CN103514838B CN 103514838 B CN103514838 B CN 103514838B CN 201210226409 A CN201210226409 A CN 201210226409A CN 103514838 B CN103514838 B CN 103514838B
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Abstract
The invention provides a kind of multicolor backlight and realize device, including: positive pole transmission line, for transmitting the driving electric current of a kind of frequency；The first to the n-th luminescence unit, for showing the light of the first to the n-th color respectively, each luminescence unit has the first end and the second end, and wherein n is greater than the natural number of 1；The first to the n-th passive filter, for exporting the driving electric current of the first to the n-th frequency respectively to open corresponding in the first to the n-th luminescence unit, wherein, each passive filter includes: the input that is connected to positive pole transmission line, the outfan of the first end of the corresponding luminescence unit being connected to the first to the n-th luminescence unit and the earth terminal being connected with negative pole transmission line；Negative pole transmission line, is connected with the second end of the first to the n-th luminescence unit.The present invention reduces the quantity of transmission line compared with former multicolor backlight driving method, saved quantity and the cost of electronic component, reduced the complexity of electronic circuit, improve the reliability of backlight circuit.
Description
Technical field
The present invention relates to a kind of apparatus and method realizing multiple backlight, more particularly, it relates to one utilizes two wires to pass
Defeated driving method realizes the apparatus and method of multicolor backlight.
Background technology
Monochromatic (i.e. black and white) liquid crystal display due in its advantage such as high reliability and low-power consumption industrial circle more still by extensively
General use.In order to be able to the content allowing user also can see display in dark environment clearly, we generally add in display
Backlight, user can be turned on and off backlight as required.
Fig. 1 shows the backing structure of current liquid crystal display module.Fig. 1 left side illustrates liquid crystal display when backlight is closed
Device；And the liquid crystal display that Fig. 1 right figure is when showing backlight open.
Fig. 2 shows the backlight effect of liquid crystal display.
Generally the backlight of liquid crystal display is monochromatic light, is most commonly that white light, by some light emitting diodes (LED)
Serial or parallel connection, then form area source by light guide plate.We both can realize transmission of electricity with two transmission lines and drive backlight, wherein
One is positive pole, and one is negative pole.
But we need two backlight wires of display can drive the backlight of multiple color in some application scenario,
And according to the different color of practical situation switching at runtime, show white or green the most under normal circumstances, having the feelings of warning
Redness etc. is shown under condition.
Fig. 3 shows the display that multiple backlight color can freely switch.
Usual a kind of light emitting diode can only produce the backlight of a kind of color.To obtain the backlight of three kinds of different colours,
We need to use three groups of different types of light emitting diodes.Fig. 4 is that the circuit of three groups of different color LEDs of driving is former
Reason figure.As shown in Figure 4, three groups of different color LEDs are driven to need four transmission lines (positive pole, three negative poles).
Fig. 4 shows the circuit theory diagrams of the backlight driving three groups of different colours with four transmission lines.
But in some product, due to limited by wiring space, wire and cable connector and cable hold quantitative limitation or
The restriction of Products Compatibility etc., we can only use two transmission lines to realize the transmission of electricity to backlight and driving.Use conventional ADS driving
Method, two transmission lines can only drive the light source of one group of color, it is impossible to drives the light source of three groups and more than three groups colors.
It is different from traditional driving method, present invention achieves and drive three groups and more than three groups colors with two transmission lines
Light source, it is achieved thereby that drive the purpose of multicolor backlight with two collimation methods.
The implementation method having identity function with the present invention has following two.
Existing method 1, two groups of light emitting diode reverse parallel connections.
Fig. 5 shows that two groups of light emitting diode parallel connected in reverse phase are to drive the circuit theory diagrams of bicolor backlight.As it is shown in figure 5,
The positive pole of first group of light emitting diode (red) and the negative pole of second group of light emitting diode (green) are connected, the negative pole of first group with
The positive pole of second group is connected.Whole backlight only has two electrode K1 and K2, when K1 high level K2 low level, and first group of luminescence two
Pole pipe is opened, and second group of closedown, whole backlight is shown in red；When K1 low level, during K2 high level, second group of unlatching, first
Group is closed, and whole backlight is shown in green.We can drive the light source of two kinds of colors with two transmission lines by this method,
But this method cannot drive the light source of three kinds and more than three kinds colors, thus can not realize the polychrome back of the body truly
Light.
Existing method 2, signal modulation.
Fig. 6 shows that signal modulation drives the circuit theory diagrams of multicolor backlight.As shown in Figure 6, this method is to face
The switching signal AC carrier of color switching is modulated, the AC signal after being modulated by two wire transmissions of A, B, also has
The audio signal of method different frequency defines the light source drive signal of different colours.In source ends, by demodulator or filter
Ripple device takes out light source switch signal, then the backlight by light source driving circuit display different colours.This method seems only with A, B
Two transmission lines achieve the switching of multiple color backlight, the most such demodulator/wave filter and light source driving circuit
Being required for external power supply to be powered, particularly filtration and demodulation to audio signal must use active filter, because of
And add cost and the complexity of electronic circuit.If plus two power transmission lines, the most this method at least needs
Four transmission lines.Although in this way achieve the driving of multicolor backlight, but actually employ four transmission lines.
So both the above method can not meet the driving requirement of multicolor backlight and two transmission lines simultaneously.
Additionally, prior art there is also a kind of method 3, voltage selection method.
Fig. 7 shows that voltage selection method drives the circuit theory diagrams of multicolor backlight.As it is shown in fig. 7, sending out in each color
Concatenating voltage comparator before optical diode, the input voltage only meeting predetermined threshold range could pass through comparator, pass through
Setting the threshold voltage ranges of different voltage comparator, we just can select out from different input voltages and meet setting
Voltage, drives corresponding light emitting diode, and so we just light the luminescence of different colours by changing input voltage value
Diode.Although this method achieves the backlight driving different colours with two transmission lines, but due to the driving after selection
Voltage is different, so the quantity often organizing the light emitting diode of color also differs, if they are made liquid crystal display
Backlight, even back degree can be caused poor, the problem such as shades of colour brightness disproportionation.
Summary of the invention
Additional aspects of the present invention and advantage part will be set forth in the description that follows, and also having partly can from describe substantially
Ground is found out, or can obtain in the practice of the invention.
The present invention proposes a kind of new backlight drive scheme, makes us only achieve that multiple color with two transmission lines
Backlight color switching and drive.
The invention provides a kind of multicolor backlight and realize device, including: positive pole transmission line, for transmitting driving of a kind of frequency
Streaming current；The first to the n-th luminescence unit, for showing the light of the first to the n-th color respectively, each luminescence unit has the first end
With the second end, wherein n is greater than the natural number of 1；The first to the n-th passive filter, for output the first to the n-th frequency respectively
Driving electric current to open corresponding in the first to the n-th luminescence unit, wherein, each passive filter includes: be just connected to
The input of pole transmission line, be connected to the first end of a corresponding luminescence unit of the first to the n-th luminescence unit outfan and
The earth terminal being connected with negative pole transmission line；Negative pole transmission line, is connected with the second end of the first to the n-th luminescence unit.
The present invention also provides for a kind of multicolor backlight implementation method, including: via one in the first to the n-th passive filter
Transmit by by the driving electric current of positive pole transmission line to open in the first to the n-th luminescence unit and transmission is by driving electricity
The corresponding luminescence unit that the passive filter of stream is connected, wherein n is greater than the natural number of 1.
The quantity (transmission line reduces 50%) of transmission line was The present invention reduces compared with former multicolor backlight driving method,
Save quantity and the cost of electronic component, reduced the complexity of electronic circuit, improve the reliability of backlight circuit.
It is characteristic of the invention that two line transmission drive multicolor backlight, it use passive filtering technology.
Accompanying drawing explanation
By combining accompanying drawing, the preferred embodiments of the present invention are described in detail, the above and other purpose of the present invention,
Characteristic and advantage will become apparent, the most identical label mutually isostructural unit of appointment, and wherein:
Fig. 1 shows the backing structure of current liquid crystal display module；
Fig. 2 shows the backlight effect of liquid crystal display；
Fig. 3 shows the display that multiple backlight color can freely switch；
Fig. 4 shows the circuit theory diagrams of the backlight driving three groups of different colours with four transmission lines；
Fig. 5 shows that two groups of light emitting diode parallel connected in reverse phase are to drive the circuit theory diagrams of bicolor backlight；
Fig. 6 shows that signal modulation drives the circuit theory diagrams of multicolor backlight；
Fig. 7 shows that voltage selection method drives the circuit theory diagrams of multicolor backlight；
Fig. 8 shows that utilizing passive bandwidth filter to realize frequency selection drives the circuit theory diagrams of multicolor backlight；
Fig. 9 shows the first design circuit diagram of three kinds of passive bandwidth filters of frequency range；
Figure 10 shows the spectrogram of passive filter shown in Fig. 9；
Figure 11 shows the second design circuit diagram of three kinds of passive bandwidth filters of frequency range；
Figure 12 shows the spectrogram of three kinds of wave filter in Figure 11；
Figure 13 is the multicolor backlight system realized with two transmission lines designed according to three kinds of wave filter in Fig. 9
Physical circuit figure；With
Figure 14 is the multicolor backlight system realized with two transmission lines designed according to three kinds of wave filter in Figure 11
Another case physical circuit figure.
Detailed description of the invention
The present invention is fully described below with reference to the accompanying drawing illustrating the embodiment of the present invention.But, the present invention can be with many
Different forms realizes, and should not be assumed that to be limited to embodiment described here.On the contrary, it is provided that these embodiments are to make these public affairs
Open thorough and complete, and the scope of the present invention will be given full expression to those skilled in the art.In the accompanying drawings, for the sake of clarity
It is exaggerated assembly.
Should be appreciated that it can be to be directly connected to or coupling when claiming " element " " being connected to " or " coupled " to another element
Receive another element or intermediary element can be there is.On the contrary, when claim element " be directly connected to " or " being directly coupled to " another
During element, there is not intermediary element.The element that identical reference instruction is identical.Term "and/or" used herein includes
Any and all combination of one or more relevant projects listed.
Although should be appreciated that and term first, second, third, etc. can being used here to describe each element, assembly and/or portion
Point, but these elements, assembly and/or part should not be limited by these terms.These terms are used only for element, assembly or part
Mutually make a distinction.Therefore, the first element discussed below, assembly or part are permissible on the premise of imparting knowledge to students without departing substantially from the present invention
It is referred to as the second element, assembly or part.
Term used herein is only used to describe the purpose of specific embodiment, and is not limiting as the present invention.This
In the singulative " " that uses, " one " and " that (this) " be also intended to comprise plural form, unless in context clearly
Point out not comprise.Should be appreciated that term " include " indicating where used in this disclosure described feature, integer, step, operation,
Element and/or the existence of assembly, but be not precluded from other features one or more, integer, step, operation, element, assembly and/
Or the existence of a combination thereof or interpolation.
Unless otherwise defined, all terms used herein (including technology and scientific terminology) have with the present invention belonging to lead
The identical meanings that the those of ordinary skill in territory is commonly understood by.It is also understood that those terms such as defined in usual dictionary
Should be interpreted as having the implication consistent with they implications in the context of correlation technique, and do not apply idealization or
The most formal meaning is explained, unless the most so defined.
It is based on passive filtering technology that the technology of the present invention realizes, owing to passive filter is not having the situation of external power source
Under also can realize filtration and the selection of frequency, we are by designing the passive filter of different frequency section, these wave filter
Connect with the light emitting diode of different colours respectively, when we need the backlight of wherein certain color, it is only necessary in circuit
Input the driving electric current of the filter frequencies corresponding with this backlight photo.
Hereinafter illustrate only trichroism backlight drive.But ability from it is to be understood by the skilled artisans that different pass through by increasing
The passive filter of frequency range can realize the backlight drive of more than three kinds colors, and its principle is similar with shown below.
Fig. 8 shows that utilizing passive bandwidth filter to realize frequency selection drives the circuit theory diagrams of multicolor backlight.
As shown in Figure 8, passive filter 801, passive filter 802, passive filter 803 select frequency 1, frequency respectively
2 and frequency 3 signal, A, B are for driving current input terminal.Passive filter 801, passive filter 802, passive filter 803 points
Do not open the first luminescence unit the 804, second luminescence unit 805 and the 3rd luminescence unit 806.When the first luminescence unit opened by needs
Time 804 (red backlight), it is only necessary at input incoming frequency 1 electric current；When the second luminescence unit 805 opened by needs, (yellow is carried on the back
Light) time, only need incoming frequency 2 electric current；When the 3rd luminescence unit 806 (green colored backlights) opened by needs, only need incoming frequency 3 electricity
Stream.
When needs red, green, yellow colour mixture backlight, only need to alternately input the driving electric current of different frequency range, thus realize various
The backlight of color shows.Alternatively, it is also possible to the band current inputting each filter spectrum overlapping district is multiple to open simultaneously
The backlight of different colours.
Owing to we use passive filter, it is not necessary to external power source is powered, so just having only to two transmission lines
Multicolor backlight can be realized drive.
Therefore, according to Fig. 8, via the one or more transmission in three passive filters by by positive pole transmission line
Drive electric current to open in three luminescence units with transmission by drive the passive filter of electric current to be connected one or many
Individual corresponding luminescence unit such that it is able to realize the multicolor backlight driving method according to the present invention.
Passive filter can be made up of the circuit comprising some passive devices such as resistor, capacitor, inducer.Fig. 9
Show the first design circuit diagram of three kinds of passive bandwidth filters of frequency range.
As it is shown in figure 9, which show the wave filter design of three kinds of frequency ranges.Wave filter 901 is low-frequency filter；Wave filter
902 is high frequency filter；Wave filter 903 is intermediate-frequency filter.
Such as Fig. 9, wave filter 901 includes inducer L1, resistor R1 and capacitor C1.Wherein, the inductance of inducer L1
Value is 1mH, and the resistance of resistor R1 is 200 Ω, and the capacitance of capacitor C1 is 100NF.Wave filter 903 include resistor R2,
Capacitor C2, capacitor C3 and resistor R3.Wherein, the resistance of resistor R2 and R3 is respectively 100 Ω and 1k Ω, capacitor C2
It is respectively 33NF and 1NF with the capacitance of C3.Wave filter 902 includes capacitor C4 and resistor R4.Wherein, the electricity of capacitor C4
Capacitance is 0.2nF, and the resistance of resistor R2 is 5k Ω.It can be seen in figure 9 that only used as several few resistors, electric capacity
Device and inducer, BOM (Bill of Material, BOM) cost almost can or slightly be disregarded, compared with active filter,
The circuit of the present invention is greatly saved the cost of components and parts.
Figure 10 shows the spectrogram of passive filter shown in Fig. 9.
Figure 10 gives three shown in Fig. 9 kind the spectrum curve of wave filter.As long as choosing suitable driving in each frequency range
Power frequency so that can pass through in this frequency a kind of wave filter, thus can realize shades of colour backlight
On-off control.The most in Fig. 10, frequency 1 selects 70Hz, frequency 2 to select 20kHz, frequency 3 to select 3MHz, these three frequency just can only
Wherein a wave filter passes through, serve the effect that different colours backlight selects to control.
In actual applications, we can select the kind of passive filter flexibly, chooses different component values, obtains
The wave filter of different frequency.
Figure 11 shows the second design circuit diagram of three kinds of passive bandwidth filters of frequency range.
Figure 11 is another design of the passive filter of three kinds of frequency ranges.Herein, in three kinds of wave filter being all selected in
Low-frequency range, avoids high-frequency band, makes drive circuit be easier to realize.
As shown in figure 11, wave filter 1101 includes inducer L2, resistor R5 and capacitor C5.Wherein, inducer L2
Inductance value be 60mH, the capacitance that resistance is 200 Ω and capacitor C5 of resistor R5 be 3.3 μ F.Wave filter 1102 wraps
Include resistor R6 and R7, capacitor C6 and C7 and inducer L3.Wherein, the resistance value of resistor R6 and R7 is respectively 100 Ω
With 2K Ω, the capacitance of capacitor C6 and C7 respectively 0.1 μ F and 0.1nF, the inductance value of inducer L3 are 10mH.Wave filter
1103 include resistor R8, inducer L4 and capacitor C8.Wherein, the resistance value of resistor R8 be 1K Ω, the electricity of inducer L4
Inductance value be the capacitance of 3mH and capacitor C8 be 1nF.
Figure 12 shows the spectrogram of three kinds of wave filter in Figure 11.
Figure 12 is the spectrogram of three kinds of wave filter in Figure 11, it can be seen that their spectral range has nonoverlapping part,
Thus can be as selection wave filter.In fig. 12, such as, frequency 1 selects 100Hz, frequency 2 to select 5kHz, frequency 3 to select 300kHz,
These three frequency just can only be passed through in a wave filter wherein, serves the effect that different colours backlight selects to control.
According to actual needs, the spectral range that can design wave filter partly overlaps and part is the most overlapping.So, driving is worked as
When frequency is in overlapping range, the backlight of two kinds of colors can be opened simultaneously, and when driving frequency is in not overlapping range, only
Open the backlight of a kind of color.It is thus possible to meet different actual demands.
Figure 13 is the multicolor backlight system realized with two transmission lines designed according to three kinds of wave filter in Fig. 9
Physical circuit figure.
As shown in figure 13, luminescence unit 1301 comprises red light emitting diodes D1, D2, D3 of series connection；Luminescence unit 1302
Comprise green LED D4, D5, D6 of series connection；And luminescence unit 1303 comprise the blue LED D7 of series connection, D8,
D9。
As shown in figure 13, wave filter 901, wave filter 902 and wave filter 903 respectively with luminescence unit 1301, luminescence unit
1302 and luminescence unit 1303 connect, and wave filter and luminescence unit 3 unit in series parallel with one another.
Specifically, the input of wave filter 901, wave filter 902 and wave filter 903 is all connected to positive pole transmission line A.Filtering
The outfan of device 901 is connected to the positive pole of luminescence unit 1301 by the resistor R9 that resistance is 50 Ω；The output of wave filter 902
End is led to by the outfan of positive pole and wave filter 903 that the resistor R10 that resistance is 300 Ω is connected to luminescence unit 1302
Cross the resistor R11 that resistance is 300 Ω and be connected to the positive pole of luminescence unit 1303.Wave filter 901, wave filter 902 and wave filter
The negative pole of the earth terminal of 903 and luminescence unit 1301, luminescence unit 1302 and luminescence unit 1303 is all connected to negative pole transmission
Line K.
Figure 14 is the multicolor backlight system realized with two transmission lines designed according to three kinds of wave filter in Figure 11
Another case physical circuit figure.Compared with Figure 13, it changes circuit structure and the component values of passive filter, i.e. uses
Shown in Figure 11 three kind wave filter designs, thus the frequency of wave filter is the most different, but principle used and Figure 13 are the same.
I.e. wave filter 1101, wave filter 1102 and wave filter 1103 respectively with luminescence unit 1301, luminescence unit 1302 and luminescence unit
1303 series connection, and wave filter and luminescence unit 3 unit in series parallel with one another.The change of the above circuit all exists
In protection scope of the present invention.
The present invention can be used in the monochromatic liquid crystal display module of all band backlights, it is also possible at advertising lamp box, traffic refers to
Showing lamp, automobile signal light, in the product such as hospital's signal lamp.
For the present invention, we also can be optimized in terms of following two and improve, and first is at input current waveform
On, how to optimize waveform, make signal all be used effectively in whole period of change, improve backlight luminescence efficiency；Second be
In the design of wave filter components and parts, the how value of design element device, reduces the filtering loss of useful signal.
The present invention realizes driving and the switching of multiple backlight color with two transmission lines, with passive filter to driving electric current
Select.Thus, the circuit of the present invention is greatly saved the cost of components and parts.
Although describe the present invention in conjunction with being presently believed to be most realistic and optimum embodiment, but those skilled in the art
It is to be understood that and the invention is not restricted to the disclosed embodiments, on the contrary, it is contemplated that cover spirit and the model of claims
The various amendments included within farmland and equivalent construction.
Claims (23)
1. multicolor backlight realizes a device, including:
Positive pole transmission line, for transmitting the driving electric current of a kind of frequency；
The first to the n-th luminescence unit, for respectively show the first to the n-th color light, each luminescence unit have the first end and
Second end, wherein n is greater than the natural number of 1；
The first to the n-th passive filter, for exporting the driving electric current of the first to the n-th frequency respectively to open the first to the n-th
In light unit corresponding one, wherein, each passive filter includes: is connected to the input of positive pole transmission line, is connected to
The outfan of the first end of a corresponding luminescence unit of one to the n-th luminescence unit and the earth terminal being connected with negative pole transmission line；
Negative pole transmission line, is connected with the second end of the first to the n-th luminescence unit.
2. multicolor backlight as claimed in claim 1 realizes device, and wherein, each luminescence unit includes multiple serial or parallel connection
A kind of light emitting diode of color.
3. multicolor backlight as claimed in claim 2 realizes device, and wherein, the light of the first to the n-th color is n kind different colours
Light.
4. multicolor backlight as claimed in claim 3 realizes device, and wherein, each passive filter is by comprising resistor, electric capacity
The circuit of device constitute or by comprising resistor, capacitor, the circuit of inducer are constituted.
5. multicolor backlight as claimed in claim 4 realizes device, wherein, by alternately inputting two or more different frequency
Drive electric current, alternately open with transmit by the passive filter of the two or multiple driving electric current be connected two or more
Luminescence unit.
6. multicolor backlight as claimed in claim 4 realizes device, wherein, and two or many in the first to the n-th passive filter
Individual is at the overlapped wave filter of band segment.
7. multicolor backlight as claimed in claim 6 realizes device, wherein, when the frequency driving electric current of positive pole transmission line
When being in the overlapped frequency bands of two or more passive filter, unlatching simultaneously is connected with the two or multiple passive filter
Two or more luminescence units.
8. the multicolor backlight as described in claim 5 or 7 realizes device, and wherein, the first to the n-th passive filter is all medium and low frequency
The wave filter of section.
9. multicolor backlight as claimed in claim 8 realizes device, and wherein, n is 3.
10. multicolor backlight as claimed in claim 9 realizes device, wherein,
First passive filter passes through the driving electric current of first frequency to open the first luminescence unit；
Second passive filter passes through the driving electric current of second frequency to open the second luminescence unit；And
3rd passive filter passes through the driving electric current of the 3rd frequency to open the 3rd luminescence unit.
11. multicolor backlights as claimed in claim 10 realize device, wherein,
First passive filter is the first inducer, the first resistor and the first capacitor series circuit；
Second passive filter is the second capacitor and the second resistor in series circuit；And
3rd passive filter is the parallel units that constitutes of the 3rd resistor and the 3rd capacitor and the 4th resistor, the 4th electric capacity
The circuit that device series connection is formed.
12. multicolor backlights as claimed in claim 10 realize device, wherein,
First passive filter is the second inducer, the 5th resistor and the 5th capacitor series circuit；
Second passive filter is the parallel units that constitutes of the 7th resistor and the 7th capacitor and the 6th resistor, the 6th electric capacity
The circuit that device, the 3rd inducer series connection are formed；And
3rd passive filter is the parallel units that constitutes of the 8th resistor and the 4th inducer and the series connection formation of the 8th capacitor
Circuit.
13. 1 kinds of multicolor backlight implementation methods, including:
Via the one or more transmission in the first to the n-th passive filter by by the driving electric current of positive pole transmission line with
Open be connected by one or more passive filters of driving electric current in the first to the n-th luminescence unit with transmission
Or multiple corresponding luminescence unit, wherein n is greater than the natural number of 1.
14. multicolor backlight implementation methods as claimed in claim 13, wherein, the first to the n-th luminescence unit display n kind difference face
The light of color.
15. multicolor backlight implementation methods as claimed in claim 14, wherein, change warp by changing the frequency driving electric current
By in the first to the n-th passive filter, the luminescence unit opened by the passive filter of described driving electric current of transmission.
16. multicolor backlight implementation methods as claimed in claim 15, wherein, each luminescence unit includes multiple serial or parallel connection
The light emitting diode of a kind of color.
17. multicolor backlight implementation methods as claimed in claim 16, wherein, each passive filter is by comprising resistor, electricity
The circuit of container constitute or by comprising resistor, capacitor, the circuit of inducer are constituted.
18. multicolor backlight implementation methods as claimed in claim 17, wherein, by alternately inputting two or more different frequency
Driving electric current, alternately open and be connected by two or more passive filters of said two or multiple driving electric current with transmission
The two or more luminescence units connect.
19. multicolor backlight implementation methods as claimed in claim 17, wherein, in the first to the n-th passive filter two or
Multiple is at the overlapped wave filter of band segment.
20. multicolor backlight implementation methods as claimed in claim 19, wherein, when the frequency driving electric current of positive pole transmission line
When rate is in the overlapped frequency bands of two or more passive filter, opens simultaneously and be connected with the two or multiple passive filter
Two or more luminescence units.
The 21. multicolor backlight implementation methods as described in claim 18 or 20, wherein, during the first to the n-th passive filter is all
The wave filter of low-frequency range.
22. multicolor backlight implementation methods as claimed in claim 21, wherein, n is 3.
23. multicolor backlight implementation methods as claimed in claim 22, wherein,
First passive filter passes through the driving electric current of first frequency to open the first colour light emitting unit；
Second passive filter passes through the driving electric current of second frequency to open the second colour light emitting unit；And
3rd passive filter passes through the driving electric current of the 3rd frequency to open the 3rd luminescence unit.
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| CN105101574A (en) * | 2015-09-06 | 2015-11-25 | 广德利德光电有限公司 | Two-wire light emitting diode (LED) driving control integrated circuit with power supply and signal combined |
| CN113543407B (en) * | 2021-07-22 | 2023-11-24 | 宁波市芯能微电子科技有限公司 | Light emitting diode driving system |
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| JP3827082B2 (en) * | 2002-10-24 | 2006-09-27 | 株式会社中川研究所 | Broadcast system, light bulb, lighting device |
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| CN101098165A (en) * | 2006-06-27 | 2008-01-02 | 上海未来宽带技术及应用工程研究中心有限公司 | Method for providing high speed broadband service on coaxial cable |
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