CN201904072U - LED backlight circuit driven and controlled by Scaler chip in display - Google Patents
LED backlight circuit driven and controlled by Scaler chip in display Download PDFInfo
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- CN201904072U CN201904072U CN2010206358012U CN201020635801U CN201904072U CN 201904072 U CN201904072 U CN 201904072U CN 2010206358012 U CN2010206358012 U CN 2010206358012U CN 201020635801 U CN201020635801 U CN 201020635801U CN 201904072 U CN201904072 U CN 201904072U
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Abstract
The utility model discloses an LED backlight circuit driven and controlled by a Scaler clip in a display, which comprises a Scaler clip, an amplifying driving circuit and a booster circuit. An input end of the amplifying driving circuit is connected with a PWM (pulse-width modulation) signal output end of the Scaler clip and an input end of a power source; an input end of the booster circuit is connected with an output end of the amplifying driving circuit, a DIM dimming signal output end of the Scaler clip and the input end of the power source; an output end of the booster circuit is connected with an input end of the LED backlight; an ISEN current detection input end of the Scaler clip is connected with a feedback current output end of the booster circuit; and a voltage detection input end of the Scaler clip is connected with a feedback voltage output end of the booster circuit. By driving and controlling the LED backlight by the aid of the Scaler clip in a liquid crystal display, functions of the Scaler clip can be fully utilized without additionally adding a control clip, the LED backlight circuit can be driven and controlled simply and reliably, and the manufacturing cost of the circuit used for driving and controlling the LED backlight is reduced.
Description
Technical field
The utility model relates to display backlight source Drive and Control Circuit, relates in particular to a kind of display Scaler chip drives control LED-backlit source circuit of utilizing.
Background technology
At present LCD has been brought into use the LED fluorescent tube be made up of LED (light emitting diode) backlight as liquid crystal panel gradually, abbreviates the LED-backlit source as.The Drive and Control Circuit in present LED-backlit source; general all is to adopt special control chip to realize defencive functions such as the overvoltage protection in LED-backlit source, overcurrent protection, brightness adjustment control; to guarantee that the LED-backlit source can reliable and stablely power; sort circuit control is complicated; and the cost of control chip is often than higher; cause the Drive and Control Circuit cost height in LED-backlit source, make the also corresponding increase of manufacturing cost of LCD.The Scaler chip that often uses in the LCD is a kind of signal processing chip at present, and it can be converted to digital signal to the R/G/B analog picture signal of computing machine, puts processing by the difference feeding, exports the liquid crystal panel sequential control circuit to; It also has functions such as RS232 communication, frequency computation part, detection input signal, power supply control, OSD control, and it can output pwm signal (Pulse Width Modulation pulse-width signal) and DIM dim signal.
Summary of the invention
The utility model purpose provides a kind of display Scaler chip drives of utilizing simple for structure, that cost is low and controls the LED-backlit source circuit.
The utility model adopts following scheme to realize: Scaler chip drives control LED-backlit source circuit comprises the Scaler chip, amplification driving circuit and booster circuit, the input end of described amplification driving circuit connects the pwm signal output terminal and the power input of Scaler chip, the input end of booster circuit connects the output terminal of amplification driving circuit, the DIM dim signal output terminal and the power input of Scaler chip, the output terminal of booster circuit connects the input end in LED-backlit source, the ISEN current detecting input end of Scaler chip connects the feedback current output terminal of booster circuit, and the voltage detecting input end of Scaler chip connects the feedback voltage output terminal of booster circuit.
Described amplification driving circuit comprises an electric capacity that links to each other with the pwm signal output terminal of Scaler chip, the electric capacity other end is connected with first resistance and second resistance, the first resistance other end connects power input, the second resistance other end connects the base stage of first triode, the collector of first triode is connected with the 3rd resistance, the base stage of the negative pole of diode and second triode, the collector of second triode connects the 5th resistance, the 3rd, the other end of the 5th resistance connects power input, the positive pole of diode connects the 4th resistance, the 4th resistance other end connects the emitter of second triode, the emitter of second triode also is connected with the 6th, the 7th resistance, the other end of the 6th resistance connects the emitter and the earth terminal of first triode, and the other end of the 7th resistance (being the output terminal of amplification driving circuit) connects the input end of booster circuit.
Described amplification driving circuit also can be and comprises first resistance that links to each other with the pwm signal output terminal of Scaler chip, the first resistance other end connects the grid of a MOSFET pipe, the drain electrode of the one MOSFET pipe connects the grid of second resistance and the 2nd MOSFET pipe, the drain electrode of the 2nd MOSFET pipe connects the 3rd resistance, the 4th resistance, the base stage of third and fourth triode, second resistance, the collector of the 3rd resistance other end and the 3rd triode is connected power input, the emitter of the 3rd triode connects the emitter of the 5th resistance and the 4th triode, the collector of the 4th triode, the source electrode of the one MOSFET pipe, the other end of the source electrode of the 2nd MOSFET pipe and the 4th resistance is connected earth terminal jointly, be provided with the 6th resistance between the collector of the other end of the 5th resistance and the 4th triode, the other end of the 5th resistance (being the output terminal of amplification driving circuit) connects the input end of booster circuit.
Described booster circuit comprises the inductance that links to each other with power input, the output terminal of inductance connects the drain electrode of commutation diode positive pole and the 5th MOSFET pipe, the grid of the 5th MOSFET pipe connects the output terminal of described amplification driving circuit, the source electrode of the 5th MOSFET pipe connects the 8th resistance one end, the negative pole of commutation diode connects second electric capacity, the 3rd capacitance cathode and the 9th resistance one end, the 9th resistance other end connects the tenth resistance one end, the other end of the 8th resistance, the second electric capacity negative pole, the 3rd electric capacity negative pole be connected earth terminal and the 11 resistance one end more jointly after the tenth resistance other end links together, the other end of the 11 resistance connects the source electrode of the 6th MOSFET pipe, the grid of the 6th MOSFET pipe connects the DIM dim signal output terminal of Scaler chip, the negative pole of commutation diode is the output terminal of booster circuit, its corresponding input end that connects the LED-backlit source; The drain electrode of the 6th MOSFET pipe connects the output terminal in LED-backlit source, the source electrode of the 5th MOSFET pipe also connects the 3rd diode cathode, the 9th resistance is connected the positive pole of second diode with the link of the tenth resistance, the negative pole of second, third diode (being the feedback voltage output terminal of booster circuit) connects the voltage detecting input end of Scaler chip; The source electrode of the 6th MOSFET pipe (being the feedback current output terminal of booster circuit) also connects the ISEN current detecting input end of Scaler chip.
The utility model utilizes amplification driving circuit to make it can make the MOSFET in the booster circuit manage Q5 conducting work the pwm control signal amplification of Scaler chip output, utilize booster circuit that the voltage transitions of power input input is the voltage for the work of LED-backlit source, the pwm signal output terminal output frequency of described Scaler chip is the drive control signal of hundreds of KHz, the size of its dutycycle is according to the voltage adjustment of the voltage detecting input end and the ISEN current detecting input end of Scaler chip, when the voltage of ISEN current detecting input end during less than the voltage detecting input terminal voltage, dutycycle increases; Otherwise then reduce.The DIM dim signal output terminal of described Scaler chip is output as the dim signal of frequency hundreds of Hz, the DIM dim signal is constantly lighted LED-backlit source circulation at interval and is extinguished conversion, because the frequency of DIM dim signal is usually greater than 150Hz, the circulation of LED-backlit source is constantly lighted at interval and is extinguished conversion and is difficult for being discovered by human eye, do not have flickering during the eye-observation LCD, so can be by adjusting the size of its dutycycle, the time scale that the energising in adjustment LED-backlit source is lighted and cut off the power supply and extinguish, regulate the mean flow rate in LED-backlit source, realize the adjusting of LCD brightness.When the voltage detecting input terminal voltage of described Scaler chip was higher than the protection voltage of setting in the Scaler chip, the Scaler chip stopped to export pwm control signal, and the backlight circuit is not worked, thus protection backlight circuit and LED-backlit source.
The beneficial effects of the utility model are: adopt said structure, the utility model utilizes directly that the Scaler chip comes drive controlling LED-backlit source in the LCD, make full use of the function of Scaler chip, do not increase extra control chip, can be succinctly drive controlling LED-backlit source circuit reliably, reduce the manufacturing cost of the Drive and Control Circuit in LED-backlit source.
Description of drawings
Now in conjunction with the accompanying drawings the utility model is further elaborated:
Fig. 1 is the schematic block circuit diagram of the utility model display;
Fig. 2 is the circuit theory diagrams of the utility model amplification driving circuit;
Fig. 3 is the circuit theory diagrams of another embodiment of the utility model amplification driving circuit;
Fig. 4 is the circuit theory diagrams of the utility model booster circuit.
Embodiment
As shown in Figure 1, the utility model comprises Scaler chip 1, amplification driving circuit 2 and booster circuit 3, the input end of described amplification driving circuit 2 connects the pwm signal output terminal and the power input Vdc of Scaler chip 1, the input end of booster circuit 3 connects the output terminal of amplification driving circuit 2, the DIM dim signal output terminal of Scaler chip 1 and power input Vdc, the output terminal of booster circuit 3 connects the input end in LED-backlit source 4, the ISEN current detecting input end of Scaler chip 1 connects the feedback current output terminal of booster circuit 3, and the voltage detecting input end 11 of Scaler chip 1 connects the feedback voltage output terminal of booster circuit 3.
As shown in Figure 2, described amplification driving circuit 2 comprises a capacitor C 1 that links to each other with the pwm signal output terminal of Scaler chip 1, capacitor C 1 other end is connected with first resistance R 1 and second resistance R 2, first resistance R, 1 other end connects power input Vdc, second resistance R, 2 other ends connect the base stage of the first triode Q1, the collector of the first triode Q1 is connected with the 3rd resistance R 3, the base stage of the negative pole of diode D1 and the second triode Q2, the collector of the second triode Q2 connects the 5th resistance R 5, the 3rd R3, the other end of the 5th resistance R 5 connects power input Vdc, the positive pole of diode D1 connects the 4th resistance R 4, the 4th resistance R 4 other ends connect the emitter of the second triode Q2, the emitter of the second triode Q2 also is connected with the 6th, the 7th resistance R 6, R7, the other end of the 6th resistance R 6 connects emitter and the earth terminal of the first triode Q1, and the other end of the 7th resistance R 7 (being the output terminal of amplification driving circuit 2) connects the input end of booster circuit 3.
As shown in Figure 3, described amplification driving circuit 2 also can be and comprises first resistance R 1 that links to each other with the pwm signal output terminal of Scaler chip 1, first resistance R, 1 other end connects the grid of MOSFET pipe Q1, the drain electrode of the one MOSFET pipe Q1 connects the grid of second resistance R 2 and the 2nd MOSFET pipe Q2, the drain electrode of the 2nd MOSFET pipe Q2 connects the 3rd resistance R 3, the 4th resistance R 4, the third and fourth triode Q3, the base stage of Q4, second resistance R 2, the collector of the 3rd resistance R 3 other ends and the 3rd triode Q3 is connected power input Vdc, the emitter of the 3rd triode Q3 connects the emitter of the 5th resistance R 5 and the 4th triode Q4, the collector of the 4th triode Q4, the source electrode of the one MOSFET pipe Q1, the source electrode of the 2nd MOSFET pipe Q2 and the other end of the 4th resistance R 4 are connected earth terminal jointly, the other end (being the output terminal of amplification driving circuit 2) that is provided with the 6th resistance R 6, the five resistance R 5 between the collector of the other end of the 5th resistance R 5 and the 4th triode Q4 connects the input end of booster circuit 3.
As shown in Figure 4, described booster circuit 3 comprises the inductance L 1 that links to each other with power input Vdc, the output terminal of inductance L 1 connects the drain electrode of anodal ZD1 of commutation diode and the 5th MOSFET pipe Q5, the grid of the 5th MOSFET pipe Q5 connects the output terminal of described amplification driving circuit 2, the source electrode of the 5th MOSFET pipe Q5 connects the 8th resistance R 8, the negative pole of commutation diode ZD1 connects second capacitor C 2, the 3rd capacitor C 3 anodal and the 9th resistance R 9 one ends, the 9th resistance R 9 other ends connect the tenth resistance R 10 1 ends again, the other end of the 8th resistance R 8, second capacitor C, 2 negative poles, the 3rd capacitor C 3 negative poles be connected earth terminal and the 11 resistance R 11 1 ends more jointly after the tenth resistance R 10 other ends link together, the other end of the 11 resistance R 11 connects the source electrode of the 6th MOSFET pipe Q6, the grid of the 6th MOSFET pipe Q6 connects the source electrode of the 7th triode Q7, the base stage of the 7th triode Q7 connects the DIM dim signal output terminal of Scaler chip 1, the emitter of the 7th triode Q7 connects earth terminal, be connected with the 11 resistance R 13 between the emitter of the 7th triode Q7 and source electrode, the source electrode of the 7th triode Q7 also is connected with the 12 resistance R 12, the 12 resistance R 12 other ends and connects power input Vdc; The negative pole of commutation diode ZD1 is the output terminal of booster circuit 3, its corresponding input end that connects LED-backlit source 4; The drain electrode of the 6th MOSFET pipe connects the output terminal in LED-backlit source 4, the source electrode of the 5th MOSFET pipe Q5 also connects the 3rd diode D3 positive pole, the 9th resistance R 9 is connected the positive pole of the second diode D2 with the link of the tenth resistance R 10, the negative pole of second, third diode D2, D3 (being the feedback voltage output terminal of booster circuit 3) connects the voltage detecting input end 11 of Scaler chip 1; The source electrode (being the feedback current output terminal of booster circuit 3) of the 6th MOSFET pipe Q6 also connects the ISEN current detecting input end of Scaler chip 1.
Claims (4)
1. utilize display Scaler chip drives control LED-backlit source circuit, it is characterized in that: comprise the Scaler chip, amplification driving circuit and booster circuit, the input end of described amplification driving circuit connects the pwm signal output terminal and the power input of Scaler chip, the input end of booster circuit connects the output terminal of amplification driving circuit, the DIM dim signal output terminal and the power input of Scaler chip, the output terminal of booster circuit connects the input end in LED-backlit source, the ISEN current detecting input end of Scaler chip connects the feedback current output terminal of booster circuit, and the voltage detecting input end of Scaler chip connects the feedback voltage output terminal of booster circuit.
2. the display Scaler chip drives control LED-backlit source circuit of utilizing according to claim 1, it is characterized in that: described amplification driving circuit comprises an electric capacity that links to each other with the pwm signal output terminal of Scaler chip, the electric capacity other end is connected with first resistance and second resistance, the first resistance other end connects power input, the second resistance other end connects the base stage of first triode, the collector of first triode is connected with the 3rd resistance, the base stage of the negative pole of diode and second triode, the collector of second triode connects the 5th resistance, the 3rd, the other end of the 5th resistance connects power input, the positive pole of diode connects the 4th resistance, the 4th resistance other end connects the emitter of second triode, the emitter of second triode also is connected with the 6th, the 7th resistance, the other end of the 6th resistance connects the emitter and the earth terminal of first triode, and the other end of the 7th resistance connects the input end of booster circuit.
3. the display Scaler chip drives control LED-backlit source circuit of utilizing according to claim 1, it is characterized in that: described amplification driving circuit also can be and comprises first resistance that links to each other with the pwm signal output terminal of Scaler chip, the first resistance other end connects the grid of a MOSFET pipe, the drain electrode of the one MOSFET pipe connects the grid of second resistance and the 2nd MOSFET pipe, the drain electrode of the 2nd MOSFET pipe connects the 3rd resistance, the 4th resistance, the base stage of third and fourth triode, second resistance, the collector of the 3rd resistance other end and the 3rd triode is connected power input, the emitter of the 3rd triode connects the emitter of the 5th resistance and the 4th triode, the collector of the 4th triode, the source electrode of the one MOSFET pipe, the other end of the source electrode of the 2nd MOSFET pipe and the 4th resistance is connected earth terminal jointly, be provided with the 6th resistance between the collector of the other end of the 5th resistance and the 4th triode, the other end of the 5th resistance connects the input end of booster circuit.
4. the display Scaler chip drives control LED-backlit source circuit of utilizing according to claim 1, it is characterized in that: described booster circuit comprises the inductance that links to each other with power input, the output terminal of inductance connects the drain electrode of commutation diode positive pole and the 5th MOSFET pipe, the grid of the 5th MOSFET pipe connects the output terminal of described amplification driving circuit, the source electrode of the 5th MOSFET pipe connects the 8th resistance one end, the negative pole of commutation diode connects second electric capacity, the 3rd capacitance cathode and the 9th resistance one end, the 9th resistance other end connects the tenth resistance one end, the other end of the 8th resistance, second electric capacity, the 3rd electric capacity negative pole be connected earth terminal and the 11 resistance one end more jointly after the tenth resistance other end links together, the other end of the 11 resistance connects the source electrode of the 6th MOSFET pipe, the grid of the 6th MOSFET pipe connects the DIM dim signal output terminal of Scaler chip, the negative pole of commutation diode is the output terminal of booster circuit, its corresponding input end that connects the LED-backlit source; The drain electrode of the 6th MOSFET pipe connects the output terminal in LED-backlit source, the source electrode of the 5th MOSFET pipe also connects the 3rd diode cathode, the 9th resistance is connected the positive pole of second diode with the link of the tenth resistance, the negative pole of second, third diode connects the voltage detecting input end of Scaler chip; The source electrode of the 6th MOSFET pipe connects the ISEN current detecting input end of Scaler chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206358012U CN201904072U (en) | 2010-12-01 | 2010-12-01 | LED backlight circuit driven and controlled by Scaler chip in display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206358012U CN201904072U (en) | 2010-12-01 | 2010-12-01 | LED backlight circuit driven and controlled by Scaler chip in display |
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| CN201904072U true CN201904072U (en) | 2011-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206358012U Expired - Fee Related CN201904072U (en) | 2010-12-01 | 2010-12-01 | LED backlight circuit driven and controlled by Scaler chip in display |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102404921A (en) * | 2011-12-03 | 2012-04-04 | 南京普天大唐信息电子有限公司 | Output current adjustable intelligent constant current power supply device |
| CN102413615A (en) * | 2011-11-30 | 2012-04-11 | 林万炯 | Two-wire input dimming circuit for DC-DC (direct current-direct current) control |
| CN102646402A (en) * | 2012-04-20 | 2012-08-22 | 青岛海信电器股份有限公司 | Backlight driving voltage control device, backlight driving voltage control method and television |
| CN103244881A (en) * | 2013-04-03 | 2013-08-14 | 天长市金陵电子有限责任公司 | Intelligent light control device of LED streetlamp |
| CN103474033A (en) * | 2013-08-09 | 2013-12-25 | 京东方科技集团股份有限公司 | Boost control circuit and control method thereof, boost circuit, and display apparatus |
| CN113744695A (en) * | 2021-08-04 | 2021-12-03 | 青岛鼎信通讯股份有限公司 | Low-cost LED backlight control circuit applied to station terminal |
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2010
- 2010-12-01 CN CN2010206358012U patent/CN201904072U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102413615A (en) * | 2011-11-30 | 2012-04-11 | 林万炯 | Two-wire input dimming circuit for DC-DC (direct current-direct current) control |
| CN102413615B (en) * | 2011-11-30 | 2014-08-06 | 林万炯 | Two-wire input dimming circuit for DC-DC (direct current-direct current) control |
| CN102404921A (en) * | 2011-12-03 | 2012-04-04 | 南京普天大唐信息电子有限公司 | Output current adjustable intelligent constant current power supply device |
| CN102404921B (en) * | 2011-12-03 | 2014-01-01 | 南京普天大唐信息电子有限公司 | Output current adjustable intelligent constant current power supply device |
| CN102646402A (en) * | 2012-04-20 | 2012-08-22 | 青岛海信电器股份有限公司 | Backlight driving voltage control device, backlight driving voltage control method and television |
| CN102646402B (en) * | 2012-04-20 | 2014-04-16 | 青岛海信电器股份有限公司 | Backlight driving voltage control device, backlight driving voltage control method and television |
| US10147364B2 (en) | 2012-04-20 | 2018-12-04 | Hisense Electric Co., Ltd. | Backlight drive voltage control device, backlight drive voltage control method and television |
| CN103244881A (en) * | 2013-04-03 | 2013-08-14 | 天长市金陵电子有限责任公司 | Intelligent light control device of LED streetlamp |
| CN103474033A (en) * | 2013-08-09 | 2013-12-25 | 京东方科技集团股份有限公司 | Boost control circuit and control method thereof, boost circuit, and display apparatus |
| CN103474033B (en) * | 2013-08-09 | 2016-06-22 | 京东方科技集团股份有限公司 | Boost control circuit and control method, booster circuit, display device |
| CN113744695A (en) * | 2021-08-04 | 2021-12-03 | 青岛鼎信通讯股份有限公司 | Low-cost LED backlight control circuit applied to station terminal |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110720 Termination date: 20131201 |