CN103517521B - A kind of LED high-voltage drives backlight circuit and high drive back light apparatus - Google Patents
A kind of LED high-voltage drives backlight circuit and high drive back light apparatus Download PDFInfo
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- CN103517521B CN103517521B CN201310412263.9A CN201310412263A CN103517521B CN 103517521 B CN103517521 B CN 103517521B CN 201310412263 A CN201310412263 A CN 201310412263A CN 103517521 B CN103517521 B CN 103517521B
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- 239000003990 capacitor Substances 0.000 claims abstract description 19
- 230000005669 field effect Effects 0.000 claims description 36
- 238000005070 sampling Methods 0.000 claims description 6
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
Abstract
The embodiment of the invention discloses a kind of LED high-voltage and drive backlight circuit and high drive back light apparatus, wherein, LED high-voltage drives backlight circuit to comprise pwm circuit, LED illuminating circuit, transformer T1, diode D200, diode D201, filter capacitor EC201, resistance R401, resistance R402, resistance R403, resistance R404, resistance R225, resistance R302, inductance L 1, operational amplifier OR, photoelectrical coupler U1 and power supply; Adopt the present invention, high drive LED backlight circuit is satisfied the demands, and reduces costs, improve precision.
Description
Technical field
The present invention relates to a kind of electronic circuit technology field, particularly relate to a kind of LED high-voltage and drive backlight circuit and high drive back light apparatus.
Background technology
Backlight is positioned at liquid crystal display a kind of light source behind, and its illumination effect will directly have influence on the effect of liquid crystal display, and liquid crystal display itself is not luminous, is the result of the modulation of source display of its behind.Backlight driving is powered to backlight and lights backlight, existing backlight drive circuit need power supply through multistage PWM (PulseWidthModulation) circuit conversion be backlight required voltage, and the backlight of parallel connection is when output current is larger, precision is lower, and many group pwm circuits too increase cost.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, provides a kind of LED high-voltage to drive backlight circuit and high drive back light apparatus.One group of pwm circuit can be saved, backlight is connected simultaneously, reach and reduce costs and propose high-precision requirement.
In order to solve the problems of the technologies described above, embodiments provide a kind of LED high-voltage and drive backlight circuit, comprise pwm circuit, LED illuminating circuit, transformer T1, diode D200, diode D201, filter capacitor EC201, resistance R401, resistance R402, resistance R403, resistance R404, resistance R225, resistance R302, inductance L 1, operational amplifier OR, photoelectrical coupler U1 and power supply;
Wherein, one end of described pwm circuit and the input of described transformer T1 while be connected, the another side of the input of described transformer T1 is also connected with power supply, the output ground connection on one side of described transformer T1, another side is connected with the anode of described diode D200, the negative electrode of described diode D200 is connected with the positive pole of described filter capacitor EC201, the negative pole of described filter capacitor EC201 is connected with the anode of described diode D201, the negative electrode of described diode D201 is connected with one end of described inductance L 1, the other end ground connection of described inductance L 1;
The inverting input of described operational amplifier OR is connected with one end of described resistance R404 and one end of described resistance R402 respectively, the other end ground connection of described resistance R404, the other end of described resistance R402 is connected with one end of described resistance R225, the other end of described resistance R225 is connected with one end of described resistance R403, the other end of described resistance R403 is connected with the in-phase input end of described operational amplifier OR and one end of described resistance R401 respectively, the other end ground connection of described resistance R401, the output of described operational amplifier OR is connected with one end of described resistance R302,
The anode of described LED illuminating circuit is connected with the other end of described resistance R225, and the negative electrode of described LED illuminating circuit is connected with the anode of described diode D201; The negative electrode of described LED illuminating circuit is also connected with one end of described resistance R302, and the other end of described resistance R302 is connected with the input of described photoelectrical coupler U1, the input another side ground connection of described photoelectrical coupler U1; The output of described photoelectrical coupler U1 while be connected with described pwm circuit, described photoelectrical coupler U1 output another side ground connection.
Wherein, described pwm circuit comprises pwm chip U200, resistance R207, resistance R201, resistance R208, resistance R238, resistance R239 and field effect transistor Q215;
Wherein, described pwm chip U200 feedback pin FB be connected with the output of described photoelectrical coupler U1, the output pin Gate of described pwm chip U200 is connected with one end of described resistance R207, the other end of described resistance R207 is connected with the grid of described field effect transistor Q215, the sampling pin CS of described pwm chip U200 is connected with one end of described resistance R201, the other end of described resistance R201 is connected with one end of described resistance R208 and the source electrode of described field effect transistor Q215 respectively, the other end of described resistance R208 is connected with the grid of described field effect transistor Q215, after described resistance R238 is connected respectively with the two ends of described resistance R239, one end is connected with the source electrode of described field effect transistor Q215, other end ground connection, the drain electrode of described field effect transistor Q215 and the input of described transformer T1 while be connected.
Wherein, described LED illuminating circuit comprises the LED array be made up of light-emitting diode and forms, the anode of wherein said LED array is connected with the other end of described resistance R225, the negative electrode of described LED array is connected with the anode of described diode D201 and one end of described resistance R302 respectively, and the light-emitting diode in described LED array is connected in series.
Correspondingly, the embodiment of the present invention additionally provides a kind of high drive back light apparatus, comprise power supply, high drive backlight circuit, backlight, one end of described high drive backlight circuit is connected with described power supply, and the other end of described high drive backlight circuit is connected with described backlight;
Wherein, described high drive backlight circuit comprises pwm circuit, transformer T1, diode D200, diode D201, filter capacitor EC201, resistance R401, resistance R402, resistance R403, resistance R404, resistance R225, resistance R302, inductance L 1, operational amplifier OR, photoelectrical coupler U1 and power supply;
Wherein, one end of described pwm circuit and the input of described transformer T1 while be connected, the output ground connection on one side of described transformer T1, another side is connected with the anode of described diode D200, the negative electrode of described diode D200 is connected with the positive pole of described filter capacitor EC201, the negative pole of described filter capacitor EC201 is connected with the anode of described diode D201, and the negative electrode of described diode D201 is connected with one end of described inductance L 1, the other end ground connection of described inductance L 1;
The inverting input of described operational amplifier OR is connected with one end of described resistance R404 and one end of described resistance R402 respectively, the other end ground connection of described resistance R404, the other end of described resistance R402 is connected with one end of described resistance R225, the other end of described resistance R225 is connected with one end of described resistance R403, the other end of described resistance R403 is connected with the in-phase input end of described operational amplifier OR and one end of described resistance R401 respectively, the other end ground connection of described resistance R401, the output of described operational amplifier OR is connected with one end of described resistance R302,
One end of described backlight is connected with the other end of described resistance R225, and the other end of described backlight is connected with the anode of described diode D201; The other end of described backlight is also connected with one end of described resistance R302, and the other end of described resistance R302 is connected with the input of described photoelectrical coupler U1, the input another side ground connection of described photoelectrical coupler U1; The output of described photoelectrical coupler U1 while be connected with described pwm circuit, the another side ground connection of described photoelectrical coupler U1 output.
Wherein, described pwm circuit comprises pwm chip U200, resistance R207, resistance R201, resistance R208, resistance R238, resistance R239 and field effect transistor Q215;
Wherein, described pwm chip U200 feedback pin FB be connected with the output of described photoelectrical coupler U1, the output pin Gate of described pwm chip U200 is connected with one end of described resistance R207, the other end of described resistance R207 is connected with the grid of described field effect transistor Q215, the sampling pin CS of described pwm chip U200 is connected with one end of described resistance R201, the other end of described resistance R201 is connected with one end of described resistance R208 and the source electrode of described field effect transistor Q215 respectively, the other end of described resistance R208 is connected with the grid of described field effect transistor Q215, after described resistance R238 is connected respectively with the two ends of described resistance R239, one end is connected with the source electrode of described field effect transistor Q215, other end ground connection, the drain electrode of described field effect transistor Q215 and the input of described transformer T1 while be connected.
Wherein, described backlight comprises the LED array be made up of light-emitting diode and forms.
Implement the embodiment of the present invention, there is following beneficial effect:
The embodiment of the present invention is after decreasing one group of pwm circuit, power supply can be directly changed into the voltage required for backlight, then output current is controlled by operational amplifier, backlight series connection is carried high-precision while, output voltage is controlled by dividing potential drop, high drive LED backlight circuit is satisfied the demands, and reduces costs, improve precision.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 a kind of LED high-voltage disclosed in the embodiment of the present invention drives the circuit diagram of backlight circuit;
The structure chart of Fig. 2 a kind of high drive back light apparatus disclosed in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, Fig. 1 a kind of LED high-voltage disclosed in the embodiment of the present invention drives the circuit diagram of backlight circuit, comprises pwm circuit 1, LED illuminating circuit 2, transformer T1, diode D200, diode D201, filter capacitor EC201, resistance R401, resistance R402, resistance R403, resistance R404, resistance R225, resistance R302, inductance L 1, operational amplifier OR, photoelectrical coupler U1 and power supply;
Wherein, one end of described pwm circuit 1 and the input of described transformer T1 while be connected, the another side of the input of described transformer T1 is also connected with power supply, the output ground connection on one side of described transformer T1, another side is connected with the anode of described diode D200, the negative electrode of described diode D200 is connected with the positive pole of described filter capacitor EC201, the negative pole of described filter capacitor EC201 is connected with the anode of described diode D201, the negative electrode of described diode D201 is connected with one end of described inductance L 1, the other end ground connection of described inductance L 1;
The inverting input of described operational amplifier OR is connected with one end of described resistance R404 and one end of described resistance R402 respectively, the other end ground connection of described resistance R404, the other end of described resistance R402 is connected with one end of described resistance R225, the other end of described resistance R225 is connected with one end of described resistance R403, the other end of described resistance R403 is connected with the in-phase input end of described operational amplifier OR and one end of described resistance R401 respectively, the other end ground connection of described resistance R401, the output of described operational amplifier OR is connected with one end of described resistance R302,
The anode LED+ of described LED illuminating circuit 2 is connected with the other end of described resistance R225, and the negative electrode LED-of described LED illuminating circuit 2 is connected with the anode of described diode D201; The negative electrode LED-of described LED illuminating circuit is also connected with one end of described resistance R302, and the other end of described resistance R302 is connected with the input of described photoelectrical coupler U1, the another side ground connection of the input of described photoelectrical coupler U1; The output of described photoelectrical coupler U1 while be connected with described pwm circuit, the another side ground connection of described photoelectrical coupler U1 output.
Wherein, described pwm circuit 1 comprises pwm chip U200, resistance R207, resistance R201, resistance R208, resistance R238, resistance R239 and field effect transistor Q215;
Wherein, described pwm chip U200 feedback pin FB be connected with the output of described photoelectrical coupler U1, the output pin Gate of described pwm chip U200 is connected with one end of described resistance R207, the other end of described resistance R207 is connected with the grid of described field effect transistor Q215, the sampling pin CS of described pwm chip U200 is connected with one end of described resistance R201, the other end of described resistance R201 is connected with one end of described resistance R208 and the source electrode of described field effect transistor Q215 respectively, the other end of described resistance R208 is connected with the grid of described field effect transistor Q215, after described resistance R238 is connected respectively with the two ends of described resistance R239, one end is connected with the source electrode of described field effect transistor Q215, other end ground connection, the drain electrode of described field effect transistor Q215 is connected for one time with the input of described transformer T1.
Wherein, described LED illuminating circuit 2 comprises the LED array be made up of light-emitting diode and forms, the anode of wherein said LED array is connected with the other end of described resistance R225, the negative electrode of described LED array is connected with the anode of described diode D201 and one end of described resistance R302 respectively, and the light-emitting diode in described LED array is connected in series.
The operation principle of the embodiment of the present invention:
Power supply is directly converted to LED illuminating circuit required voltage by pwm circuit, meanwhile, controls output current by operational amplifier, backlight series connection is carried high-precision while, controls output voltage, high drive LED backlight circuit is satisfied the demands by dividing potential drop.The output of operational amplifier can send real-time for the electric current of LED illuminating circuit to described photoelectrical coupler U1, and described photoelectrical coupler U1 Secure isolation LED illuminating circuit and pwm chip, protection component is not damaged.
Implement the embodiment of the present invention, there is following beneficial effect:
The embodiment of the present invention is after decreasing one group of pwm circuit, power supply can be directly changed into the voltage required for backlight, then output current is controlled by operational amplifier, backlight series connection is carried high-precision while, output voltage is controlled by dividing potential drop, make LED high-voltage drive backlight circuit to satisfy the demands, and reduce costs, improve precision.
Refer to Fig. 2, the structure chart of Fig. 2 a kind of high drive back light apparatus disclosed in the embodiment of the present invention, comprise power supply, high drive backlight circuit, backlight, one end of described high drive backlight circuit is connected with described power supply, and the other end of described high drive backlight circuit is connected with described backlight;
Wherein, described high drive backlight circuit comprises pwm circuit, transformer T1, diode D200, diode D201, filter capacitor EC201, resistance R401, resistance R402, resistance R403, resistance R404, resistance R225, resistance R302, inductance L 1, operational amplifier OR, photoelectrical coupler U1 and power supply;
Wherein, one end of described pwm circuit and the input of described transformer T1 while be connected, the output ground connection on one side of described transformer T1, another side is connected with the anode of described diode D200, the negative electrode of described diode D200 is connected with the positive pole of described filter capacitor EC201, the negative pole of described filter capacitor EC201 is connected with the anode of described diode D201, and the negative electrode of described diode D201 is connected with one end of described inductance L 1, the other end ground connection of described inductance L 1;
The inverting input of described operational amplifier OR is connected with one end of described resistance R404 and one end of described resistance R402 respectively, the other end ground connection of described resistance R404, the other end of described resistance R402 is connected with one end of described resistance R225, the other end of described resistance R225 is connected with one end of described resistance R403, the other end of described resistance R403 is connected with the in-phase input end of described operational amplifier OR and one end of described resistance R401 respectively, the other end ground connection of described resistance R401, the output of described operational amplifier OR is connected with one end of described resistance R302,
One end of described backlight is connected with the other end of described resistance R225, and the other end of described backlight is connected with the anode of described diode D201; The other end of described backlight is also connected with one end of described resistance R302, and the other end of described resistance R302 is connected with the input of described photoelectrical coupler U1, the another side ground connection of the input of described photoelectrical coupler U1; The output of described photoelectrical coupler U1 while be connected with described pwm circuit, the another side ground connection of described photoelectrical coupler U1 output.
Wherein, described pwm circuit comprises pwm chip U200, resistance R207, resistance R201, resistance R208, resistance R238, resistance R239 and field effect transistor Q215;
Wherein, described pwm chip U200 feedback pin FB be connected with the output of described photoelectrical coupler U1, the output pin Gate of described pwm chip U200 is connected with one end of described resistance R207, the other end of described resistance R207 is connected with the grid of described field effect transistor Q215, the sampling pin CS of described pwm chip U200 is connected with one end of described resistance R201, the other end of described resistance R201 is connected with one end of described resistance R208 and the source electrode of described field effect transistor Q215 respectively, the other end of described resistance R208 is connected with the grid of described field effect transistor Q215, after described resistance R238 is connected respectively with the two ends of described resistance R239, one end is connected with the source electrode of described field effect transistor Q215, other end ground connection, the drain electrode of described field effect transistor Q215 and the input of described transformer T1 while be connected.
Wherein, described backlight comprises the LED display device that the LED array that is made up of light-emitting diode is formed, as LED television etc.
The operation principle of the embodiment of the present invention:
Described power supply is directly adjusted to described backlight required voltage by described high drive backlight circuit, output current is controlled by operational amplifier wherein, simultaneously by the voltage at point pressure-controlled backlight two ends, described resistance R225 is connected on backlight, output current can reflect in real time on R225, described backlight series connection, obtains accurate electric current.
Implement the embodiment of the present invention, there is following beneficial effect:
The embodiment of the present invention is after decreasing one group of pwm circuit, power supply can be directly changed into the voltage required for backlight, then output current is controlled by operational amplifier, backlight series connection is carried high-precision while, output voltage is controlled by dividing potential drop, high drive LED backlight circuit is satisfied the demands, and reduces costs, improve precision.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (4)
1. a LED high-voltage drives backlight circuit, it is characterized in that, comprise pwm circuit, LED illuminating circuit, transformer T1, diode D200, diode D201, filter capacitor EC201, resistance R401, resistance R402, resistance R403, resistance R404, resistance R225, resistance R302, inductance L 1, operational amplifier OR, photoelectrical coupler U1 and power supply;
Wherein, one end of described pwm circuit and the input of described transformer T1 while be connected, the another side of the input of described transformer T1 is also connected with power supply, the output ground connection on one side of described transformer T1, the another side of the output of described transformer T1 is connected with the anode of described diode D200, the negative electrode of described diode D200 is connected with the positive pole of described filter capacitor EC201, the negative pole of described filter capacitor EC201 is connected with the anode of described diode D201, the negative electrode of described diode D201 is connected with one end of described inductance L 1, the other end ground connection of described inductance L 1,
The inverting input of described operational amplifier OR is connected with one end of described resistance R404 and one end of described resistance R402 respectively, the other end ground connection of described resistance R404, the other end of described resistance R402 is connected with one end of described resistance R225, the other end of described resistance R225 is connected with one end of described resistance R403, the other end of described resistance R403 is connected with the in-phase input end of described operational amplifier OR and one end of described resistance R401 respectively, the other end ground connection of described resistance R401, the output of described operational amplifier OR is connected with one end of described resistance R302,
The anode of described LED illuminating circuit is connected with the other end of described resistance R225, and the negative electrode of described LED illuminating circuit is connected with the anode of described diode D201; The negative electrode of described LED illuminating circuit is also connected with one end of described resistance R302, and the other end of described resistance R302 is connected with the input of described photoelectrical coupler U1, the input another side ground connection of described photoelectrical coupler U1; The output of described photoelectrical coupler U1 while be connected with described pwm circuit, described photoelectrical coupler U1 output another side ground connection;
Wherein, described pwm circuit comprises pwm chip U200, resistance R207, resistance R201, resistance R208, resistance R238, resistance R239 and field effect transistor Q215, the feedback pin FB of described pwm chip U200 is connected with the output of described photoelectrical coupler U1, the output pin Gate of described pwm chip U200 is connected with one end of described resistance R207, the other end of described resistance R207 is connected with the grid of described field effect transistor Q215, the sampling pin CS of described pwm chip U200 is connected with one end of described resistance R201, the other end of described resistance R201 is connected with one end of described resistance R208 and the source electrode of described field effect transistor Q215 respectively, the other end of described resistance R208 is connected with the grid of described field effect transistor Q215, after described resistance R238 is connected respectively with the two ends of described resistance R239, one end is connected with the source electrode of described field effect transistor Q215, other end ground connection, the drain electrode of described field effect transistor Q215 and the input of described transformer T1 while be connected.
2. circuit as claimed in claim 1, it is characterized in that, described LED illuminating circuit comprises the LED array be made up of light-emitting diode and forms, the anode of wherein said LED array is connected with the other end of described resistance R225, the negative electrode of described LED array is connected with the anode of described diode D201 and one end of described resistance R302 respectively, and the light-emitting diode in described LED array is connected in series.
3. a high drive back light apparatus, is characterized in that, comprises power supply, high drive backlight circuit, backlight, and one end of described high drive backlight circuit is connected with described power supply, and the other end of described high drive backlight circuit is connected with described backlight;
Wherein, described high drive backlight circuit comprises pwm circuit, transformer T1, diode D200, diode D201, filter capacitor EC201, resistance R401, resistance R402, resistance R403, resistance R404, resistance R225, resistance R302, inductance L 1, operational amplifier OR, photoelectrical coupler U1 and power supply;
Wherein, one end of described pwm circuit and the input of described transformer T1 while be connected, the output ground connection on one side of described transformer T1, another side is connected with the anode of described diode D200, the negative electrode of described diode D200 is connected with the positive pole of described filter capacitor EC201, the negative pole of described filter capacitor EC201 is connected with the anode of described diode D201, and the negative electrode of described diode D201 is connected with one end of described inductance L 1, the other end ground connection of described inductance L 1;
The inverting input of described operational amplifier OR is connected with one end of described resistance R404 and one end of described resistance R402 respectively, the other end ground connection of described resistance R404, the other end of described resistance R402 is connected with one end of described resistance R225, the other end of described resistance R225 is connected with one end of described resistance R403, the other end of described resistance R403 is connected with the in-phase input end of described operational amplifier OR and one end of described resistance R401 respectively, the other end ground connection of described resistance R401, the output of described operational amplifier OR is connected with one end of described resistance R302,
One end of described backlight is connected with the other end of described resistance R225, and the other end of described backlight is connected with the anode of described diode D201; The other end of described backlight is also connected with one end of described resistance R302, and the other end of described resistance R302 is connected with the input of described photoelectrical coupler U1, the input another side ground connection of described photoelectrical coupler U1; The output of described photoelectrical coupler U1 while be connected with described pwm circuit, described photoelectrical coupler U1 output another side ground connection;
Wherein, described pwm circuit comprises pwm chip U200, resistance R207, resistance R201, resistance R208, resistance R238, resistance R239 and field effect transistor Q215, the feedback pin FB of pwm chip U200 described in described pwm circuit is connected with the output of described photoelectrical coupler U1, the output pin Gate of described pwm chip U200 is connected with one end of described resistance R207, the other end of described resistance R207 is connected with the grid of described field effect transistor Q215, the sampling pin CS of described pwm chip U200 is connected with one end of described resistance R201, the other end of described resistance R201 is connected with one end of described resistance R208 and the source electrode of described field effect transistor Q215 respectively, the other end of described resistance R208 is connected with the grid of described field effect transistor Q215, after described resistance R238 is connected respectively with the two ends of described resistance R239, one end is connected with the source electrode of described field effect transistor Q215, other end ground connection, the drain electrode of described field effect transistor Q215 and the input of described transformer T1 while be connected.
4. equipment as claimed in claim 3, it is characterized in that, described backlight comprises the LED array be made up of light-emitting diode and forms.
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| CN201310412263.9A CN103517521B (en) | 2013-09-11 | 2013-09-11 | A kind of LED high-voltage drives backlight circuit and high drive back light apparatus |
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| CN201310412263.9A CN103517521B (en) | 2013-09-11 | 2013-09-11 | A kind of LED high-voltage drives backlight circuit and high drive back light apparatus |
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| CN103517521B true CN103517521B (en) | 2016-03-30 |
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| CN113129808B (en) * | 2019-12-31 | 2022-12-09 | Tcl科技集团股份有限公司 | Driving method and driving device of LED array and display device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0973016A2 (en) * | 1993-04-20 | 2000-01-19 | Peter Lancier Maschinenbau-Hafenhütte GmbH & Co. KG | Device for transmission of a measured value between sensors and a monitor unit |
| CN101801136A (en) * | 2010-03-17 | 2010-08-11 | 上海大学 | High-efficiency LED constant current driving circuit |
| CN202791666U (en) * | 2012-09-18 | 2013-03-13 | 京东方科技集团股份有限公司 | LED (Light Emitting Diode) backlight and display |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0973016A2 (en) * | 1993-04-20 | 2000-01-19 | Peter Lancier Maschinenbau-Hafenhütte GmbH & Co. KG | Device for transmission of a measured value between sensors and a monitor unit |
| CN101801136A (en) * | 2010-03-17 | 2010-08-11 | 上海大学 | High-efficiency LED constant current driving circuit |
| CN202791666U (en) * | 2012-09-18 | 2013-03-13 | 京东方科技集团股份有限公司 | LED (Light Emitting Diode) backlight and display |
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