CN1835652A - CCFFL and its drive method - Google Patents
CCFFL and its drive method Download PDFInfo
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- CN1835652A CN1835652A CN 200510054581 CN200510054581A CN1835652A CN 1835652 A CN1835652 A CN 1835652A CN 200510054581 CN200510054581 CN 200510054581 CN 200510054581 A CN200510054581 A CN 200510054581A CN 1835652 A CN1835652 A CN 1835652A
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Abstract
The CCFFL comprises a luminous tube, at least a first electrode and a second electrode, a transformer whose one side is connected to the first electrode and second electrode, and a full bridge circuit connected to another side of the transformer. The new driving means includes: a voltage wave form is applied to the two electrodes, which comprises electrical level, shape, slop and frequency. The voltage wave form features: a) it has bipolarity voltage wave form; b) the electrical level applied to the electrode has multiplexing levels; c) ascending and descending slope is controllable; e) the voltage level of wave form is variable; e) the frequency of the voltage wave form is variable and is disturbance; f) it can adjust the output of light.
Description
Technical field
The present invention relates to a kind of cold-cathode plane fluorescent lamp and driving method thereof, especially refer to a kind of driving method that is applied to the cold-cathode plane fluorescent lamp of Backlight For Liquid Crystal Display Panels, but be not limited to backlight, the cold-cathode plane fluorescent lamp light source also can be applicable to as advertising lighting, indication and Emergency Light etc., it all belongs to the application under the present invention.
Background technology
Manufacturing technology owing to LCD (LCD) reaches its maturity in recent years, whole world all big enterprises actively drop into research and development and adopt the production equipment that maximizes simultaneously, make the quality of LCD improve constantly, wherein desirable is a LCD TV with what attract attention; Popularize under the driving that measure carried out gradually in Digital Television, LCD TV has been the change planes leading role of tide of next ripple TV.
Traditionally LCD be a kind of can luminous voluntarily display system, therefore must adopt the source of backlight (back light) as light, existing backlight is to use the many independently backlight modules that combine of the thin fluorescent tube of cold cathode, yet the backlight module of many fluorescent tubes can be because the line source of many fluorescent tubes, make whole backlight module must use thicker diffusion sheet, the position higher apart from fluorescent tube makes equalizing light rays, this will significantly increase the thickness of display module and the temperature of module, in addition, long-time high brightness, the rate of decay that the operation of high-temperature also can make the light of every fluorescent tube export is quickened, more serious problem is, the speed of every fluorescent tube decay is also inequality, therefore, the large-sized backlight liquid crystal display module of high brightness can face the phenomenon of brightness disproportionation after a period of time, in order to overcome these shortcomings, occurred on the market with the technology of plane lamp as Backlight For Liquid Crystal Display Panels.
See also Fig. 1, it is cold-cathode plane fluorescent lamp (Cold Cathode Flat Fluorescent Lamps, CCFFL) luminous schematic diagram, wherein, cold-cathode plane fluorescent lamp 10 be by upper glass plates 11, lower glass plate 12, metal electrode 13 and 14 and fluorescent tube in the inert gas (not shown) constitute, metal electrode 13 and 14 also can be placed on the lamp body outside, forms the outer electrode cold-cathode plane fluorescent lamp.
The principle of luminosity of cold-cathode plane fluorescent lamp 10 is to apply a voltage to metal electrode 13 or 14 to make its emission or attract electronics, electronics can clash into the inert gas molecule in the fluorescent tube, make gas molecule excite and form plasma (plasma), gas molecule produces ultraviolet ray when getting back to ground state, and the fluorescent material in the exciter lamp tube wall is understood in ultraviolet ray and send visible light.
Cold-cathode plane fluorescent lamp traditionally generally is to adopt the mode of unipolar pulse voltage to drive, as shown in Figure 2.Fig. 2 is the driving pulse voltage of cold-cathode plane fluorescent lamp traditionally and the oscillogram of lamp current.
By finding out among the figure, in the mode of this kind driving,, only can form single light output because adopt unipolar voltage to drive, the type of drive of this use unipolar pulse voltage has following urgency shortcoming to be improved:
(1) because employed type of drive is the single pulse voltage of fixed polarity, therefore along with the increase of operating time, the free positive and negative ion that is produced of the gas molecule of inert gas forms wall electric charge (wall charge) near can depending on and be piled up in electrode, make follow-up driving voltage to raise and to obtain same driving usefulness, cause the luminous efficiency variation, and the temperature of the lamp face that can raise, the electric arc instability that causes lamp body to operate easily.
(2) because cold-cathode plane fluorescent lamp adopts high drive (driving voltage is usually greater than 2kV), so its electromagnetic interference effect (Electromagnetic Interference, EMI) more serious, cause easily to be assembled into after the backlight module in the future, can't be by the problem of EMI/EMC test.
Summary of the invention
Main purpose of the present invention is the luminous efficiency that promotes cold-cathode plane fluorescent lamp, and reduces the electromagnetic interference effect because of high driving voltage caused.
Another object of the present invention is to improve in the cold-cathode plane fluorescent lamp traditionally the positive and negative ion that type of drive caused because of single polar impulse voltage to be piled up near the electrode phenomenon.
Main conception of the present invention is to provide the voltage waveform of a positive-negative polarity on electrode, provide and have identical but the pulse voltage that its phase place is opposite of certain slope rising or decline and cycle, cooperate multiple level voltage mode, and utilize and reaching each level voltage after, to continue for some time, eliminate being deposited near the wall electric charge of electrode thus.
In order to increase the effect of self-maintained discharge, each level voltage has the function that continues rising or descend, and uses the voltage of this increase to overcome the wall charge voltage that is accumulated on the tube wall, makes fluorescent tube can keep the continuation discharge, increases luminous efficiency.
The present invention's another conception simultaneously is near the driving voltage additional slight disturbance operation basic frequency of control cold-cathode plane fluorescent lamp, to reduce the electromagnetic interference effect of high driving voltage, in addition, adjust the light output of lamp body for reaching tool, the present invention is the voltage-operated and inactive time ratio of control valve simultaneously, adjustable thus lay the grain output.
According to main conception of the present invention, below narration has proposed the explanation about novel type of drive:
(1) driving voltage has the bipolarity characteristics.
(2) drive voltage level has rank, multiple position pattern, is example with Fig. 3 and Fig. 5, and it has two level voltages, is not limited to two level but the present invention conceives, can contain multiple level, decides on the lamp body practical operation is required.
Can cause discharge when (3) changing to another one rank voltage, and will continue for some time Δ T and be used for accumulating the wall electric charge that next time discharges required by a rank voltage level.Then when dropping to another one rank voltage by a rank voltage, can cause another self-maintained discharge, this will effectively eliminate the accumulation of wall electric charge, and increase light output.
(4) in a certain level voltage is held time Δ T, if continue to increase or reduce the voltage that is applied, then can overcome the voltage that is caused because of accumulation wall electric charge, make discharge sustain, do not need additionally to supply with foreign current this moment, can significantly improve the luminous efficiency of lamp body.
(5) characteristic with disturbance of designed driving voltage cycle of the present invention or frequency not only can reduce the phenomenon of electric arc shakiness, and the effect that also improves significantly on electromagnetic interference suppresses.
(6) type of drive proposed by the invention can be adjusted required light output by operation and inactive time ratio.
According to main conception of the present invention, the driving method of a kind of cold-cathode plane fluorescent lamp (CCFFL) is proposed, this cold-cathode plane fluorescent lamp comprises one first electrode and one second electrode at least, this driving method comprise the following steps: (a) with the voltage of this second electrode as reference voltage, promote the voltage of this first electrode with a speed; (b) in a period of time, keep the voltage of this first electrode that is promoted; (c) repeat a step (a) at least and reach (b), make the voltage of this first electrode arrive a voltage extremity; (d) reduce the voltage of this first electrode with this speed; (e) keep the voltage of this first electrode in the period at this section; (f) repeat a step (d) at least and reach (e), make the voltage of this first electrode recover the primary voltage level; And (g) with the voltage of this first electrode as reference voltage, after the voltage that promotes this second electrode in the mode of step (b)～(f) makes it reach this first voltage extremity, recover the primary voltage level again.
According to above-mentioned conception, wherein this speed is more than or equal to 9.3 volts/millisecond.
According to above-mentioned conception, wherein this section period is more than or equal to 0.3 microsecond and smaller or equal to 2 microseconds.
According to above-mentioned conception, wherein this voltage extremity is 2 kilovolts.
According to above-mentioned conception, wherein step (c) comprises that also step is as follows: promote this voltage extremity with a voltage difference.
According to above-mentioned conception, wherein this voltage difference is more than or equal to 50 volts and smaller or equal to 200 volts.
According to above-mentioned conception, the driving frequency of this cold-cathode plane fluorescent lamp is controlled near the basic frequency value the increase and decrease scope, to drive this cold-cathode plane fluorescent lamp.
According to above-mentioned conception, wherein this frequency values is more than or equal to 30 KHz and smaller or equal to 90 KHz, and this increase and decrease scope is more than or equal to 3 KHz and smaller or equal to 5 KHz.
Driving method according to above-mentioned conception also comprises a step: by a voltage starting of controlling the contained described electrode of this cold-cathode plane fluorescent lamp and a time ratio (duty) that does not start, adjust the light output of this cold-cathode plane fluorescent lamp.
According to another conception of the present invention, a kind of cold-cathode plane fluorescent lamp (CCFFL) is proposed, comprising: a fluorescent tube comprises one first electrode and one second electrode at least; One transformer, one side are coupled to this first electrode and this second electrode; And a full-bridge circuit, be coupled to the opposite side of this transformer, in order to drive this fluorescent tube by this transformer according to aforementioned driving method.
According to above-mentioned conception, wherein this transformer is coupled to this transformer via a resonant inductance and an electric capacity.
According to above-mentioned conception, wherein this full-bridge circuit also is coupled to an input voltage.
According to above-mentioned conception, wherein this full-bridge circuit is made of metal-oxide half field effect transistor.
According to above-mentioned conception, wherein this full-bridge circuit is controlled at the driving frequency of this fluorescent tube near the increase and decrease scope of one basic frequency value, to drive this fluorescent tube.
According to above-mentioned conception, wherein this full-bridge circuit is controlled the voltage starting of the contained described electrode of this fluorescent tube and a time ratio (duty) that does not start, and adjusts the light output of this fluorescent tube.
To make technical scheme energy of the present invention by more deep understanding by following graphic and detailed description below.
Description of drawings
Fig. 1: the luminous schematic diagram of cold-cathode plane fluorescent lamp;
Fig. 2: the driving pulse voltage of cold-cathode plane fluorescent lamp and the oscillogram of lamp current traditionally;
Fig. 3: the sequential chart of light tube electric voltage waveform, lamp current waveform and the optical output waveform of the multiple level voltage characteristic of the driving method tool embodiment of cold-cathode plane fluorescent lamp of the present invention;
Fig. 4: the sequential chart of light tube electric voltage waveform, lamp current waveform and the optical output waveform of the driving method tool self-maintained discharge characteristic embodiment of cold-cathode plane fluorescent lamp of the present invention;
Fig. 5: the sequential chart of the multiple level voltage of driving method tool of cold-cathode plane fluorescent lamp of the present invention and light tube electric voltage waveform, lamp current waveform and the optical output waveform of self-maintained discharge characteristic embodiment;
Fig. 6: the driving method of cold-cathode plane fluorescent lamp of the present invention improves electromagnetic interference and the sequential chart of light tube electric voltage waveform, lamp current waveform and the optical output waveform of the unstable embodiment that discharges;
Fig. 7: the sequential chart of light tube electric voltage waveform, lamp current waveform and the optical output waveform of the voltage-operated and inactive time ratio of the light modulation driving method tool control valve of cold-cathode plane fluorescent lamp of the present invention; And
Fig. 8: the circuit structure diagram of cold-cathode plane fluorescent lamp of the present invention.
Wherein, description of reference numerals is as follows:
10,80 cold-cathode plane fluorescent lamps, 11 upper glass plates
12 lower glass plate, 13,14 metal electrodes
81 stabilizers, 82 fluorescent tubes
Vs input voltage T transformer
Lr resonant inductance Cb electric capacity
S1, S2, S3, S4 metal-oxide half field effect transistor
Embodiment
In order to improve the shortcoming of conventional art, the present invention proposes new driving voltage waveform and drive condition, it is existing that details are as follows.
See also Fig. 3, it is the sequential chart of light tube electric voltage waveform, lamp current waveform and the optical output waveform of the multiple level voltage characteristic of the driving method tool embodiment of cold-cathode plane fluorescent lamp of the present invention.
Because cold-cathode plane fluorescent lamp has two electrodes at least, drive cold-cathode plane fluorescent lamp and just need apply driving voltage electrode, type of drive of the present invention is with first different technical characterictic of prior art, drives the electrode of cold-cathode plane fluorescent lamp by the mode that applies an overlaid waveforms voltage in turn.
Explain with physical significance, control method of the present invention can be divided into two stages, phase I is that the voltage of an electrode wherein is used as reference voltage, then promote the voltage of another electrode with a speed, and within a period of time, keep its voltage, after repeating to promote for several times, make this voltage arrive a voltage extremity, then in kind reduce this voltage again, make it recover the primary voltage level; Second stage then is that the electrode of just having finished lifting-reduction process in the phase I is used as reference electrode, and promotes-be reduced in the voltage of the electrode that is taken as reference electrode in the phase I with the same manner.
Oscillogram with reality explains, and sees also the oscillogram of Fig. 3 the top, and it is to be the object of observation with first electrode.At first, earlier to the overlaid waveforms as first electrode input Fig. 3, be that voltage with second electrode is as reference voltage at this moment.
For first electrode, be the voltage (from a point) that promotes first electrode earlier, arrived a voltage extremity (about 2kV) by the time afterwards, the voltage that reduces by first electrode again makes it recover primary voltage level (b point).
Then, again with the voltage of first electrode as reference voltage, and promote the voltage (being equivalent to keep the voltage of second electrode but the voltage that reduces by first electrode) of second electrode in the same way from the oscillogram of first electrode, by the time arrived this voltage extremity 2kV (voltage that is equivalent to first electrode from the position of first electrode becomes approximately-2KV) afterwards, the voltage that reduces by second electrode again make its recover primary voltage level (from the oscillogram of first electrode be equivalent to keep the voltage of second electrode but the voltage that promotes first electrode to the c point).
Be noted that, type of drive of the present invention can realize by the mode that once promotes and reduce voltage, also can be as the embodiment of Fig. 3, mode by twice above lifting and reduction voltage realizes, just focus on, must control the speed that voltage promotes and reduces, this is because for the discharge mechanism of dielectric layer, residing voltage is not main factor during discharge, the speed that voltage rises or descends be only most important change because of.
In general, with a lifting mode, slowly rise (decline) (2kV) (following), discharge is just unfolded to 2kV as if voltage; Yet, if as shown in Figure 3, be divided into V/ t and rise or descend with two stage voltage more than or equal to the speed of 9.3V/msec, needn't reach discharge voltage can discharge.Certainly, the number of stages of voltage lifting and reduction can also be more.
Therefore, be deposited near the wall electric charge (wall charge) of electrode by in turn two electrodes being imported a half-wave, can eliminating, and then reduce consumed power,, also can reduce panel temperature simultaneously to improve luminous efficiency.When conventional art was written at the one pole ripple, the wall electric charge always was attached on the electrode with opposite polarity, if do not eliminate, can cause the required voltage that applies to become big.If with technical scheme of the present invention, when bipolar ripple loads, when polarity of voltage is reverse, original formed electric field of wall electric charge, the electric field that is caused with reverse voltage is consistent, therefore can eliminate the wall electric charge, reduces driving voltage.
Type of drive of the present invention is with second of prior art different technical characterictic, each boost or step-down after, all need to have certain standby time, keep light tube electric voltage in certain value.
With Fig. 3, each boost and step-down after standby time of a Δ T (0.3～2 μ s) all can be arranged, make the wall charge stable in electrode, so could allow discharge next time carry out fully.
Just owing to this section existence of standby time, making not only has the main discharge current (main discharge current) that produces because of booster tension in the lamp current waveform sequential chart, also can additionally increase self discharge electric current (self discharge current); Also because boosting of two stages causes its discharging current to double, light output also can double simultaneously.Therefore can improve the brightness of lamp sheet, increase efficient.
Type of drive of the present invention is with the 3rd different technical characterictic of prior art, when positive and negative half-wave is written into, can will keep voltage for the level of ceiling voltage and minimum voltage originally, being arranged to the voltage trace increases the state of (negative pressure then reduces) 50～200V, discharge (sustaindischarge) is kept in formation, therefore can improve brightness, increase luminous efficiency, as shown in Figure 4, it is the sequential chart of light tube electric voltage waveform, lamp current waveform and the optical output waveform of driving method second preferred embodiment of cold-cathode plane fluorescent lamp of the present invention.
Among the figure,, do not have lamp current (g point) in this stage of voltage extremity keeping, yet light output but is (the h district) that increases though still exist the main discharge current (main dischargecurrent) (f point) that produces because of booster tension; That is, because the effect that this voltage trace increases causes the reduction of the optical output waveform right flank slope in h district, make area (light in the h district is exported) increase that optical output waveform in the h district and X-axis are surrounded.
See also Fig. 5, it is the sequential chart of light tube electric voltage waveform, lamp current waveform and the optical output waveform of driving method the 3rd preferred embodiment of cold-cathode plane fluorescent lamp of the present invention.This embodiment is with above-mentioned three schematic diagrames that technical characterictic is implemented together.
Type of drive of the present invention is with the 4th different technical characterictic of prior art, is controlled near the basic frequency value the increase and decrease scope by the driving frequency with cold-cathode plane fluorescent lamp, drives this cold-cathode plane fluorescent lamp.
In general, the driving voltage of cold-cathode plane fluorescent lamp all very high (greater than 1KV), especially the planar lamp source that does not have mercury, and the basic frequency value of operation is mostly at 30～90kHz, but because the easiest initiation frequency of sound wave resonance (acoustic resonance) in this frequency range, therefore cause the luminous instability of lamp face easily, in addition also because be under high pressure to operate, so cause the influence of EMI easily.Therefore, the present invention improves with as shown in Figure 6 frequency disturbance waveform (frequency perturbation); With the basic frequency is that 65kHz (h district) is example, actual driving voltage frequency is beated in the variable quantity of 3～5kHz, rather than be fixed under the 65kHz purely, if so just not having the effect of acoustic resonance produces, in addition also because frequency has been done slightly little variation, cause not concentrating of energy, thereby reduced the effect of EMI.
Type of drive of the present invention is with the 5th different technical characterictic of prior art, use pulse modulation technology (Pulse-width Modulation, PWM), to reach the purpose of adjustable lay the grain output, that is to say, light output is adjusted in the operation of control light tube electric voltage and inactive time ratio (duty) thus.
As shown in Figure 7, this figure is the sequential chart of light tube electric voltage waveform, lamp current waveform and optical output waveform, it is to stop when moving when fluorescent tube is controlled to be, though optical output waveform has pulse characteristic, yet fluorescent material and filter but can be reduced to the light output ripple naked eyes can't be discovered, and actual light output and power of lamp tube can obviously descend.
See also Fig. 8, it is the circuit structure diagram of wherein a kind of execution mode of cold-cathode plane fluorescent lamp of the present invention.In this example, cold-cathode plane fluorescent lamp 80 is made of stabilizer 81, fluorescent tube 82 (representing with resistance) and high-tension transformer T; Wherein the two ends of fluorescent tube 82 are represented first electrode and second electrode respectively, stabilizer 81 then is made of full-bridge circuit, resonant inductance Lr and the capacitor C b that four metal-oxide half field effect transistor S1, S2, S3, S4 that couple are constituted, and this full-bridge circuit also is connected in an input voltage Vs.
According to structure shown in Figure 8, each switch of full-bridge circuit can carry out suitable switching and by transformer T fluorescent tube 82 be imported the waveform that fronts are described in detail in the stabilizer 81; Certainly, this structure only is a kind of execution mode wherein, and the technical staff who knows electronic circuit can realize same effect by various circuit structure, as long as its control mode and driving method do not break away from claim of the present invention institute restricted portion.
In sum, the driving method of cold-cathode plane fluorescent lamp of the present invention is to control local aura Discharge reaches comprehensively luminous purpose, and cooperates best positive minus superposing type half-wave drive waveforms and phase The pass condition promotes its light output efficiency, and temperature rise can be controlled in the effective scope, and by driving The disturbance of moving electric voltage frequency reduces the effect of EMI. Advantage of the present invention is: the luminous effect that has increased lamp body Rate; Reduced the temperature of lamp body; And have dimming function and reduce the effect that electromagnetic radiation disturbs, special Be applicable to the application of cold high and level tone face fluorescent lamp, can solve thus the shortcoming of existing type of drive.
Claims (15)
1. the driving method of a cold-cathode plane fluorescent lamp, this cold-cathode plane fluorescent lamp comprises one first electrode and one second electrode at least, and this driving method comprises the following steps:
(a) with the voltage of this second electrode as reference voltage, promote the voltage of this first electrode with a speed;
(b) in a period of time, keep the voltage of this first electrode that is promoted;
(c) repeat a step (a) at least and reach (b), make the voltage of this first electrode arrive a voltage extremity;
(d) reduce the voltage of this first electrode with this speed;
(e) keep the voltage of this first electrode in the period at this section;
(f) repeat a step (d) at least and reach (e), make the voltage of this first electrode recover the primary voltage level; And
(g) with the voltage of this first electrode as reference voltage, the voltage that promotes this second electrode in the mode of step (b)～(f) recovers the primary voltage level after making and arriving this first voltage extremity again.
2. driving method as claimed in claim 1, wherein this speed is more than or equal to 9.3 volts/millisecond.
3. driving method as claimed in claim 1, wherein this section period is more than or equal to 0.3 microsecond and smaller or equal to 2 microseconds.
4. driving method as claimed in claim 1, wherein this voltage extremity is 2 kilovolts.
5. driving method as claimed in claim 1, wherein step (c) comprises that also step is as follows: promote this voltage extremity with a voltage difference.
6. driving method as claimed in claim 5, wherein this voltage difference is more than or equal to 50 volts and smaller or equal to 200 volts.
7. driving method as claimed in claim 1, wherein the driving frequency with this cold-cathode plane fluorescent lamp is controlled near the increase and decrease scope of a basic frequency value, to drive this cold-cathode plane fluorescent lamp.
8. driving method as claimed in claim 7, wherein this frequency values is more than or equal to 30 KHz and smaller or equal to 90 KHz, and this increase and decrease scope is more than or equal to 3 KHz and smaller or equal to 5 KHz.
9. driving method as claimed in claim 1 wherein also comprises a step: by a voltage starting of controlling the contained described electrode of this cold-cathode plane fluorescent lamp and a time ratio that does not start, adjust the light output of this cold-cathode plane fluorescent lamp.
10. cold-cathode plane fluorescent lamp comprises:
One fluorescent tube comprises one first electrode and one second electrode at least;
One transformer, one side are coupled to this first electrode and this second electrode; And
One full-bridge circuit is coupled to the opposite side of this transformer, drives this fluorescent tube in order to the driving method according to claim 1 by this transformer.
11. cold-cathode plane fluorescent lamp as claimed in claim 10, wherein this transformer is coupled to this full-bridge circuit via a resonant inductance and an electric capacity.
12. cold-cathode plane fluorescent lamp as claimed in claim 10, wherein this full-bridge circuit also is coupled to an input voltage.
13. cold-cathode plane fluorescent lamp as claimed in claim 10, wherein this full-bridge circuit is made of metal-oxide half field effect transistor.
14. cold-cathode plane fluorescent lamp as claimed in claim 10, wherein this full-bridge circuit is controlled at the driving frequency of this fluorescent tube near the increase and decrease scope of one basic frequency value, to drive this fluorescent tube.
15. cold-cathode plane fluorescent lamp as claimed in claim 10, wherein this full-bridge circuit is controlled the voltage starting of the contained described electrode of this fluorescent tube and a time ratio that does not start, and adjusts the light output of this fluorescent tube.
Priority Applications (1)
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| CN 200510054581 CN1835652A (en) | 2005-03-14 | 2005-03-14 | CCFFL and its drive method |
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| CN 200510054581 CN1835652A (en) | 2005-03-14 | 2005-03-14 | CCFFL and its drive method |
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| CN1835652A true CN1835652A (en) | 2006-09-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101404240B (en) * | 2008-09-16 | 2012-01-04 | 彩虹集团公司 | Non-mercury fluorescent lamp and LCD display with the same as backlight source |
| US9755628B2 (en) | 2016-01-07 | 2017-09-05 | Delta Electronics, Inc. | Driving circuit, converter and driving method |
-
2005
- 2005-03-14 CN CN 200510054581 patent/CN1835652A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101404240B (en) * | 2008-09-16 | 2012-01-04 | 彩虹集团公司 | Non-mercury fluorescent lamp and LCD display with the same as backlight source |
| US9755628B2 (en) | 2016-01-07 | 2017-09-05 | Delta Electronics, Inc. | Driving circuit, converter and driving method |
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Owner name: TAIDA ELECTRONIC INDUSTRY CO LTD Free format text: FORMER OWNER: HANLI OPTOELECTRONICS CO., LTD. Effective date: 20070727 |
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Open date: 20060920 |