CN1716350A - Driving device for serial red, green and blue light emitting diodes - Google Patents
Driving device for serial red, green and blue light emitting diodes Download PDFInfo
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- CN1716350A CN1716350A CN 200410062905 CN200410062905A CN1716350A CN 1716350 A CN1716350 A CN 1716350A CN 200410062905 CN200410062905 CN 200410062905 CN 200410062905 A CN200410062905 A CN 200410062905A CN 1716350 A CN1716350 A CN 1716350A
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Abstract
The drive device includes one red LED, one green LED and one green LED connected serially, one power supply, and one switch unit connected to the LED's. The switch unit is switched for the optional connection of the red LED, the green LED and the green LED, so that the power supply powers at least one of the red LED, the green LED and the green LED. The switch unit controls the light emitting periods of the LED's according to the required light emitting color.
Description
Technical field
The invention relates to a kind of drive unit of light emitting diode, refer to a kind of drive unit of red, green and blue light-emitting diode of the form of connecting especially.
Background technology
Presentation Function is among personal digital assistant (PDA), mobile phone (Cell Phone), digital camera, video camera products, all be crucial, these products all have a large amount of use white light-emitting diodes (White IED) and ruddiness, green glow, blue light diode (Color R-RED mostly, G-Green, B-Blue LED), so the making of these light emitting diodes for above-mentioned digital product, all is crucial.
Present stage is wanted to produce white light emitting diode, combined with ruddiness, green glow, blue light diode, because the required driving voltage difference of Tricolor LED, for example red diodes is that 1.9 volts, green glow and blue light diode are 3.7 volts, so need control with the driving circuit of a complexity.Known driving circuit is to drive above-mentioned three look diodes with parallel way, but this can cause serious power loss, as shown in Figure 1, supply unit 10 (as a battery) provides a voltage to driving circuit 11, the output of this driving circuit (about 4.5 volts) red diodes 12 in parallel, green diode 13 and blue light diode 14, and above-mentioned three look diodes 12,13,14 difference series loads 15,16 and 17, so can design the different resistance values of above-mentioned three loads, in order to adjusting the different driving voltage of above-mentioned three look diodes, but this but makes power all be wasted in above-mentioned three loads.
If in Fig. 2 mode, supply unit 10 (as a battery) provides a voltage to driving circuit 11, the output of this driving circuit (about 10 volts) then can be avoided serious power dissipation thus with series system link red diodes 12, green diode 13, blue light diode 14 and load 15; But above-mentioned driving circuit 11 need have a critical function: i.e. control combines it and sends white light through the electric current of above-mentioned three look diodes 12,13,14.For reaching this purpose, the electric current of being flowed through must be different, and above-mentioned series system will make and makes it the electric current unanimity that flows through three look diodes to send white light.
Summary of the invention
Fundamental purpose of the present invention provides the drive unit of a kind of ruddiness of connecting, green glow and blue light-emitting diode, can make above-mentioned light emitting diode combined send needed color.
Another object of the present invention is at the drive unit that a kind of ruddiness of connecting, green glow and blue light emitting two diodes are provided, and can adjust the power supply of being supplied with, to avoid unnecessary power dissipation.
For reaching above-mentioned purpose, the invention provides a kind of drive unit of serial red, green and blue light-emitting diode, comprising: a red light-emitting diode; One green light LED; One blue light-emitting diode; One supply unit can provide power supply to above-mentioned light emitting diode; One provides the current source of fixed current to be series at above-mentioned light emitting diode, can make current value value of being maintained fixed of the above-mentioned light emitting diode of flowing through; An and switchgear, be connected in above-mentioned light emitting diode, with by converting switch device and the optionally electrically above-mentioned red light-emitting diode of series connection, green light LED, and blue light-emitting diode, make of the light emitting diode power supply of this supply unit to above-mentioned at least one electrical series connection.Above-mentioned switchgear be by one group of controlling signal driving switching, and control above-mentioned ruddiness, green glow and blue light diode fluorescent lifetime length, utilize the principle of persistence of vision, make to present needed color at last.
Description of drawings
Fig. 1 is the drive unit synoptic diagram of known ruddiness in parallel, green glow and blue light-emitting diode.
Fig. 2 is the drive unit synoptic diagram of known series connection ruddiness, green glow and blue light-emitting diode.
Fig. 3 is the connect drive unit synoptic diagram of ruddiness, green glow and blue light-emitting diode of the present invention.
Fig. 4 is the drive unit Organization Chart of series connection ruddiness, green glow and the blue light-emitting diode of a preferred embodiment of the present invention.
Embodiment
Fig. 3 is the drive unit synoptic diagram of serial red, the green and blue light-emitting diode of the present invention, and it comprises: a red light-emitting diode 12; One green light LED 13; One blue light-emitting diode 14; One supply unit 10 is in order to provide power supply to above-mentioned light emitting diode 12,13,14; One provides the current source 18 of fixed current to be series at above-mentioned light emitting diode 12,13,14, so that the current value value of being maintained fixed that flows through; An and switchgear 11, be connected in above-mentioned light emitting diode 12,13,14, to switch above-mentioned switchgear 11 by one group of controlling signal 200 and then the above-mentioned light emitting diode 12,13,14 of optionally electrically connecting, make 10 pairs of wherein light emitting diode 12,13,14 power supplies of at least one electrical series connection of above-mentioned supply unit.
Fig. 4 is the drive unit Organization Chart of series connection ruddiness, green glow and the blue light-emitting diode of a preferred embodiment of the present invention, and wherein switchgear 11 is made up of three switches 111,112 and 113, and has at least four output terminals 101,102,103 and 104.Positive pole, the 4th output terminal 104 that first output terminal 101 links the positive pole of the positive pole of above-mentioned supply unit 10 and red light-emitting diode 12, negative pole that second output terminal 102 links red light-emitting diode 12 simultaneously and green light LED 13, negative pole that the 3rd output terminal 103 links green light LED 13 simultaneously and blue light-emitting diode 14 simultaneously links the negative pole of blue light-emitting diode 14 simultaneously and the current source 18 of fixed current is provided; The two ends of first switch 111 chain first output terminal 101 and second output terminal 102 respectively; The two ends of second switch 112 chain second output terminal 102 and the 3rd output terminal 103 respectively; The two ends of the 3rd switch 113 chain the 3rd output terminal 103 and the 4th output terminal 104 respectively; Above-mentioned three switches 111,112 and 113 see through the first, second, third and the 4th output terminal 101,102,103,104 optionally ruddiness, green glow and the blue light- emitting diode 12,13,14 of bypass series connection, enable to control the whether luminous of above-mentioned light emitting diode 12,13,14.
With one group of controlling signal 200, as: the PWM pulse wave, import above-mentioned switchgear 11, this organizes the message that specific signal 200 comprises above-mentioned ruddiness, green glow and blue light diode 12,13 and 14 switching instants and light period, make 12,13,14 of three light emitting diodes be combined into required color, for example:, then must prolong red diodes 12 light periods as obtaining white light, and the light period of minimizing blue light diode 14, that finding is white light.
Can increase an adaptability boost controller 19 in addition, it is any switch switching while in these three switches, change is to the supply voltage of the light emitting diode of series connection, with 11 diode in series numbers of foundation switchgear, the supply voltage 201 that provided of control supply unit 10, make when the diode in series number more for a long time, make supply voltage 201 higher, otherwise, when the diode in series number more after a little while, reduce supply voltage 201.In the present embodiment, adaptability boost controller 19 is made up of an inductor 122, a transistor 121 and a Schottky diode 120 and electric capacity 124, this inductor 122 is used as one energy storage/exoergic device, transistor 121 forms one with 120 of Schottky diodes and switches switch, when transistor 121 presents Guan Lushi, 120 of Schottky diodes are regarded as opening circuit, and supply unit 10 will charge to inductor 122; Otherwise when transistor 121 open circuits, Schottky diode 120 is regarded as path; In addition, comparator circuit 123 back couplings one control voltage is given transistor 121 and is together controlled its cycle time with Schottky diode 120, adjusts the magnitude of voltage that adaptability boost controller 19 is exported whereby.
Again, in the present embodiment, comparator circuit 123 is formed a constant-current circuit 20 with current source 18, comparator circuit 123 is compared the voltage of current source 18 with a reference voltage, and with the turn-on cycle of comparative result, so as to the output voltage of control adaptability boost controller 19 in order to oxide-semiconductor control transistors 121.
The foregoing description only is to give an example for convenience of description, and the interest field that the present invention advocated should be as the criterion with the described scope of claim certainly, but not only limits to the foregoing description.
Claims (9)
1. the drive unit of serial red, a green and blue light-emitting diode is characterized in that comprising:
One red light-emitting diode;
One green light LED;
One blue light-emitting diode;
One supply unit is in order to provide power supply to these light emitting diodes;
One constant-current circuit is series at these light emitting diodes, so that current value value of being maintained fixed of these light emitting diodes of flowing through; And
One switchgear, be connected in these light emitting diodes, with these red light-emitting diodes of optionally electrically connecting, green light LED, and blue light-emitting diode, make of the light emitting diode power supply of this supply unit to this at least one electrical series connection by switching this switchgear.
2. the drive unit of serial red, green and blue light-emitting diode as claimed in claim 1, it is characterized in that: described this switchgear is to switch by one group of controlling signal driving.
3. the drive unit of serial red, green and blue light-emitting diode as claimed in claim 2, it is characterized in that: described this switchgear is made up of three switches, these three switches are connected to this ruddiness, green glow and blue light-emitting diode, make these red light-emitting diodes of optionally electrically connecting, green light LED, reach blue light-emitting diode.
4. the drive unit of serial red, green and blue light-emitting diode as claimed in claim 3, it is characterized in that: described these three switches are formed with the series connection form, and be linked to the two ends of these ruddiness, green glow and blue light diode individually, enable to control the whether luminous of these ruddiness, green glow and blue light diode.
5. the drive unit of serial red, green and blue light-emitting diode as claimed in claim 2, it is characterized in that: described this group controlling signal is to be one group of PWM pulse wave, and it comprises the message of these ruddiness, green glow and blue light diode switching time and fluorescent lifetime length.
6. the drive unit of serial red, green and blue light-emitting diode as claimed in claim 2, it is characterized in that: it more comprises an adaptability boost controller, with according to the luminous number of this switchgear institute diode in series, control power source voltage that this supply unit provides.
7. the drive unit of serial red, green and blue light-emitting diode as claimed in claim 6, it is characterized in that: described this adaptability boost controller is that any switch in these three switches switches simultaneously, changes the power supply to the light emitting diode of this at least one electrical series connection.
8. the drive unit of serial red, green and blue light-emitting diode as claimed in claim 6, it is characterized in that: described this adaptability boost controller is made up of an inductor, a transistor and a Schottky diode and an electric capacity, wherein this inductor is to be one energy storage/exoergic device, this transistor and this Schottky diode are energy storage or the exoergics in order to switch this inductor, and with the ratio of this inductor energy storage or exoergic time, changing provides this electrically voltage of series connection light emitting diode.
9. the drive unit of serial red, green and blue light-emitting diode as claimed in claim 6, it is characterized in that: described this constant-current circuit is made up of a current source and a comparator circuit, this comparator circuit will compare the voltage of a fixed voltage and this current source and provide a voltage to switch to above-mentioned this transistor, with the optimum value of the output voltage of adjusting the control of this adaptability boost controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410062905 CN1716350A (en) | 2004-07-02 | 2004-07-02 | Driving device for serial red, green and blue light emitting diodes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410062905 CN1716350A (en) | 2004-07-02 | 2004-07-02 | Driving device for serial red, green and blue light emitting diodes |
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| Publication Number | Publication Date |
|---|---|
| CN1716350A true CN1716350A (en) | 2006-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410062905 Pending CN1716350A (en) | 2004-07-02 | 2004-07-02 | Driving device for serial red, green and blue light emitting diodes |
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| CN (1) | CN1716350A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101191955B (en) * | 2006-12-01 | 2011-04-27 | 群康科技(深圳)有限公司 | LCD device |
| WO2011072485A1 (en) * | 2009-12-17 | 2011-06-23 | 宇威光电股份有限公司 | Light emitting device |
| CN103238376A (en) * | 2011-01-10 | 2013-08-07 | 李东源 | Led lighting device including a highly-efficient power supply |
| CN106226983A (en) * | 2016-06-30 | 2016-12-14 | 海信集团有限公司 | Projection light source drives control circuit |
| US11443689B1 (en) | 2021-02-20 | 2022-09-13 | Xiamen Tianma Micro-Electronics Co., Ltd. | Light-emitting element control circuit, display panel and display device |
-
2004
- 2004-07-02 CN CN 200410062905 patent/CN1716350A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101191955B (en) * | 2006-12-01 | 2011-04-27 | 群康科技(深圳)有限公司 | LCD device |
| WO2011072485A1 (en) * | 2009-12-17 | 2011-06-23 | 宇威光电股份有限公司 | Light emitting device |
| CN103238376A (en) * | 2011-01-10 | 2013-08-07 | 李东源 | Led lighting device including a highly-efficient power supply |
| CN103238376B (en) * | 2011-01-10 | 2015-01-07 | 李东源 | Led lighting device including a highly-efficient power supply |
| CN106226983A (en) * | 2016-06-30 | 2016-12-14 | 海信集团有限公司 | Projection light source drives control circuit |
| CN106226983B (en) * | 2016-06-30 | 2018-11-20 | 海信集团有限公司 | projection light source drive control circuit |
| US11443689B1 (en) | 2021-02-20 | 2022-09-13 | Xiamen Tianma Micro-Electronics Co., Ltd. | Light-emitting element control circuit, display panel and display device |
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