CN104376816A - LED backlight drive circuit, LED backlight device and display device - Google Patents
LED backlight drive circuit, LED backlight device and display device Download PDFInfo
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- CN104376816A CN104376816A CN201410670823.5A CN201410670823A CN104376816A CN 104376816 A CN104376816 A CN 104376816A CN 201410670823 A CN201410670823 A CN 201410670823A CN 104376816 A CN104376816 A CN 104376816A
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- led
- led backlight
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- back light
- drive circuit
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Abstract
The invention provides an LED backlight drive circuit, an LED backlight device and a display device. The LED backlight drive circuit is used for driving an LED backlight circuit which comprises at least one LED backlight unit, the first ends of the LED backlight units are connected to the LED drive voltage, the LED backlight drive circuit comprises a reference voltage providing unit used for providing predetermined reference voltage for the second ends of the LED backlight units, the LED backlight drive circuit further comprises at least one temperature compensation resistor unit, the temperature compensation resistor units are connected between the seconds ends of the LED backlight units and the level output end, and the resistance values of the temperature compensation resistor units increase along with rising of temperature and decrease along with falling of temperature. It can be ensured that current flowing through an LED keeps within the certain range, the LED reliability is improved, and the problems that power consumption is high and the service life of LEDs is short in the prior art are solved.
Description
Technical field
The present invention relates to display technique field, particularly relate to a kind of LED (Light-Emitting Diode, light emitting diode) backlight drive circuit, LED-backlit device and display device.
Background technology
Because LED backlight circuit has the advantages such as frivolous, low in energy consumption, luminescence efficiency is high, color representation power is strong, current LED backlight circuit has become a new trend of backlight technology development, the backlight circuit of LCD (LiquidCrystal Display, liquid crystal display) class display product also chooses LED backlight circuit more and more.
But LED is by the restriction of self production technology, and the impact of ambient temperature during work, make when large by the ER effect of LED, the electric current even flowing through LED exceedes load current value when continuing the long time, the LED lost of life can be caused, also can increase more power consumption simultaneously.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of LED backlight drive circuit, LED-backlit device and display device, to guarantee that the electric current flowing through LED is maintained within a certain range, improve the reliability of LED, the problem that in solution prior art, the serviceable life of power consumption height and LED is short.
In order to achieve the above object, the invention provides a kind of LED backlight drive circuit, for driving LED backlight circuit, described LED backlight circuit comprises at least one paths of LEDs back light unit, the first end access LED driving voltage of described LED backlight unit, described LED backlight drive circuit comprises the reference voltage providing unit for providing preset reference voltage for the second end of described at least one paths of LEDs back light unit, and described LED backlight drive circuit also comprises at least one thermo-compensator unit;
Described thermo-compensator unit, is connected between the second end of described LED backlight unit and a level output end;
The resistance value of described thermo-compensator unit increases along with the rising of temperature, and the resistance value of described thermo-compensator unit reduces along with the reduction of temperature.
During enforcement, described thermo-compensator unit comprises regulating resistance parallel with one another and thermistor; Described thermistor has positive temperature coefficient (PTC).
During enforcement, described thermo-compensator unit comprises the thermistor with positive temperature coefficient (PTC).
During enforcement, described reference voltage providing unit comprises PWM control module and at least one operational amplifier;
Described operational amplifier, positive input access preset reference voltage, negative input is connected with the second end of LED backlight unit described in, control end access pulse width modulated duty cycle signal, and output terminal is connected with described PWM control module;
Described PWM control module, for the output signal according to described at least one operational amplifier, produces LED driving voltage.
Present invention also offers a kind of LED-backlit device, comprise LED backlight circuit, described LED backlight circuit comprises at least one paths of LEDs back light unit; The first end access LED driving voltage of described LED backlight unit, described LED-backlit device also comprises above-mentioned LED backlight drive circuit, and described LED backlight drive circuit is for driving described LED backlight circuit;
Second end of described at least one road back light unit is connected with the reference voltage providing unit that described LED backlight drive circuit comprises;
The thermo-compensator unit that second end of described LED backlight unit also comprises with described LED backlight drive circuit is connected.
During enforcement, described LED backlight circuit comprises red LED back light unit, green LED back light unit and blue led back light unit;
Described red LED back light unit comprises the red LED of multiple series aiding connection;
Described green LED back light unit comprises the green LED of multiple series aiding connection;
Described blue led back light unit comprises the blue led of multiple series aiding connection.
During enforcement, described LED backlight circuit comprises a road monochromatic LED back light unit;
Described monochromatic LED back light unit comprises the monochromatic LED of multiple series aiding connection, and the glow color of the monochromatic LED of described multiple series aiding connection is identical.
During enforcement, described monochromatic LED is red LED, green LED, blue led or white light LEDs.
During enforcement, described LED backlight unit comprises multiple LED backlight module of connecting successively;
Each LED backlight module comprises at least two monochromatic LEDs in parallel in the same way;
The glow color of all monochromatic LEDs in described LED backlight unit is identical.
Present invention also offers a kind of display device, comprise above-mentioned LED-backlit device.
Compared with prior art, LED backlight drive circuit of the present invention, LED-backlit device and display device can guarantee that the electric current flowing through LED backlight unit is maintained within a certain range, thus improve the reliability of LED, reduce power consumption, extend the life-span of LED.
Accompanying drawing explanation
Fig. 1 is the structural drawing of the LED backlight drive circuit described in the embodiment of the present invention;
Fig. 2 is the circuit diagram of the LED backlight drive circuit described in the present invention one specific embodiment;
Fig. 3 is the structural drawing of the reference voltage providing unit that LED backlight drive circuit of the present invention comprises;
Fig. 4 is the circuit diagram of the LED-backlit device described in the embodiment of the present invention;
Fig. 5 is the circuit diagram of the LED-backlit device described in another 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.
LED backlight drive circuit described in the embodiment of the present invention, for driving LED backlight circuit, described LED backlight circuit comprises at least one paths of LEDs back light unit, the first end access LED driving voltage of described LED backlight unit, described LED backlight drive circuit comprises the reference voltage providing unit for providing preset reference voltage for the second end of described at least one paths of LEDs back light unit, and described LED backlight drive circuit also comprises at least one thermo-compensator unit;
Described thermo-compensator unit, is connected between the second end of described LED backlight unit and a level output end;
The resistance value of described thermo-compensator unit increases along with the rising of temperature, and the resistance value of described thermo-compensator unit reduces along with the reduction of temperature.
The temperature compensation unit that LED backlight drive circuit of the present invention, LED-backlit device and display device increase along with temperature rising owing to providing resistance value, and the voltage at these temperature compensation unit two ends is fixed, and flow through the electric current of this temperature compensation unit and the drive current of LED backlight unit, therefore when the temperature increases, the electric current flowing through LED backlight unit reduces, thus can guarantee that the electric current flowing through LED backlight unit is maintained within a certain range, thus improve the reliability of LED, reduce power consumption, extend the life-span of LED.
According to a kind of embodiment, as shown in Figure 1, the LED backlight drive circuit described in the embodiment of the present invention, for driving LED backlight circuit;
Described LED backlight circuit comprises red LED back light unit R-LED, green LED back light unit G-LED and blue led back light unit B-LED;
Described red LED back light unit R-LED comprises the red LED of multiple series aiding connection;
Described green LED back light unit G-LED comprises the green LED of multiple series aiding connection;
Described blue led back light unit B-LED comprises the blue led of multiple series aiding connection;
The anode tap of the anode tap of described red LED back light unit R-LED, the anode tap of described green LED back light unit G-LED and described blue led back light unit B-LED all accesses LED anode driving voltage V
lED+;
The cathode terminal access red LED cathode drive voltage V of described red LED back light unit R-LED
rLED-;
The cathode terminal access green LED cathode drive voltage V of described green LED back light unit G-LED
gLED-;
The cathode terminal access blue led cathode drive voltage V of described blue led back light unit B-LED
bLED-;
Described red LED cathode drive voltage V
rLED-, described green LED cathode drive voltage V
gLED-with described blue led cathode drive voltage V
bLED-the reference voltage providing unit all comprised by LED backlight drive circuit provides (in Fig. 1 not shown reference voltage providing unit);
Described LED backlight drive circuit also comprises the first thermo-compensator unit 11, second thermo-compensator unit 12 and the 3rd thermo-compensator unit 13;
Described first thermo-compensator unit 11 is connected between the cathode terminal of described red LED back light unit R-LED and ground end GND;
Described second thermo-compensator unit 12 is connected between the cathode terminal of described green LED back light unit G-LED and ground end GND;
Described 3rd thermo-compensator unit 13 is connected between the cathode terminal of described blue led back light unit B-LED and ground end GND;
The resistance value of described first thermo-compensator unit 11 increases along with the rising of temperature, and the resistance value of described first thermo-compensator unit 11 reduces along with the reduction of temperature;
The resistance value of described second thermo-compensator unit 12 increases along with the rising of temperature, and the resistance value of described second thermo-compensator unit 12 reduces along with the reduction of temperature;
The resistance value of described 3rd thermo-compensator unit 13 increases along with the rising of temperature, and the resistance value of described 3rd thermo-compensator unit 13 reduces along with the reduction of temperature;
In the embodiment shown in fig. 1, described LED backlight circuit is the mixed light LED backlight circuit be made up of red LED back light unit, green LED back light unit and blue led back light unit.
During enforcement, described thermo-compensator unit comprises regulating resistance parallel with one another and thermistor; Described thermistor has positive temperature coefficient (PTC).
Concrete, as shown in Figure 2, based on LED backlight drive circuit embodiment as shown in Figure 1,
Described first temperature compensation unit 11 comprises the first resistance R1 parallel with one another and the first thermistor Rx1;
Described second temperature compensation unit 12 comprises the second resistance R2 parallel with one another and the second thermistor Rx2;
Described 3rd temperature compensation unit 13 comprises the 3rd resistance R3 parallel with one another and the 3rd thermistor Rx3;
Wherein, the first thermistor Rx1, the second thermistor Rx2 and the 3rd thermistor Rx3 are the thermistors with positive temperature coefficient (PTC), and feature is that resistance value raises along with temperature and increases, and resistance value reduces along with temperature and reduces;
Equivalent resistance after first thermistor Rx1 and the first resistance R1 parallel connection represents with the first equivalent resistance R1 ';
Equivalent resistance after second thermistor Rx2 and the second resistance R2 parallel connection represents with the second equivalent resistance R2 ';
Equivalent resistance after 3rd thermistor Rx and the 3rd resistance R3 parallel connection represents with the 3rd equivalent resistance R3 ';
R1’＝R1//Rx1＝R1×Rx1/(R1+Rx1)；
R2’＝R2//Rx2＝R2×Rx2/(R2+Rx2)；
R3’＝R3//Rx3＝R3×Rx3/(R3+Rx3)；
As can be seen from above-mentioned formula, when the temperature increases, Rx1, Rx2 and Rx3 become large, and R1 ', R2 ' and R3 ' also increase thereupon, are the resistance values that can control equivalent resistance accurately by the object of conventional, electric-resistance and thermistor parallel connection herein;
The adjustment process of the electric current to red LED back light unit R-LED, green LED back light unit G-LED and blue led back light unit B-LED is flow through in following introduction:
First a given preset reference voltage V
rEFas described red LED cathode drive voltage V
rLED-, described green LED cathode drive voltage V
gLED-with described blue led cathode drive voltage V
bLED-;
The other end of described first temperature compensation unit 11, the other end of described second temperature compensation unit 12 are all connected with ground end GND with the other end of described 3rd temperature compensation unit 13;
Therefore the electric current I of red LED back light unit R-LED is flow through
rLED=V
rEF/ R1 ';
Flow through the electric current I of green LED back light unit G-LED
gLED=V
rEF/ R2 ';
Flow through the electric current I of blue led back light unit B-LED
bLED=V
rEF/ R3 ';
When the temperature increases, Rx1, Rx2 and Rx3 become large, and R1 ', R2 ' and R3 ' also increase thereupon, at preset reference voltage V
rEFin changeless situation, flow through the electric current I of red LED back light unit R-LED
rLED, flow through the electric current I of green LED back light unit G-LED
gLEDwith the electric current I flowing through blue led back light unit B-LED
bLEDcapital reduces thereupon, thus achieves the electric current that flows through LED backlight circuit and increase along with temperature and the object that reduces, effectively can extend the life-span of LED, reduce power consumption.
In the specific implementation, described thermo-compensator unit also can only comprise the thermistor with positive temperature coefficient (PTC).
During enforcement, described reference voltage providing unit comprises PWM control module and at least one operational amplifier;
Described operational amplifier, positive input access preset reference voltage, negative input is connected with the second end of LED backlight unit described in, control end access pulse width modulated duty cycle signal, and output terminal is connected with described PWM control module;
Described PWM control module, for the output signal according to described at least one operational amplifier, produces LED driving voltage.
Concrete, as shown in Figure 3, for for providing described red LED cathode drive voltage VRLED-, described green LED cathode drive voltage VGLED-and described blue led cathode drive voltage V
bLED-preset reference voltage V is provided
rEFreference voltage providing unit comprise:
First operational amplifier 21, positive input access preset reference voltage V
rEF, negative input is connected with the cathode terminal of described red LED back light unit (in Fig. 3 not shown red LED back light unit), control end access PWM Duty (pulse width modulated duty cycle signal);
Second operational amplifier 22, positive input access preset reference voltage VREF, negative input is connected with the cathode terminal of described green LED back light unit (in Fig. 3 not shown green LED back light unit), control end access PWM Duty (pulse width modulated duty cycle signal);
3rd operational amplifier 23 positive input access preset reference voltage VREF, negative input is connected with the cathode terminal of described blue led back light unit (in Fig. 3 not shown blue led back light unit), control end access PWM Duty (pulse width modulated duty cycle signal);
Described pulse width modulated duty cycle signal is provided by described PWM control module 24;
And, PWM (Pulse Width Modulation, pulse-length modulation) control module 24, according to the output signal of the output signal of described first operational amplifier 21, the output signal of described second operational amplifier 22 and described 3rd operational amplifier 23, produce LED anode driving voltage V
lED+.
Present invention also offers a kind of LED-backlit device, comprise LED backlight circuit, described LED backlight circuit comprises at least one paths of LEDs back light unit; The first end access LED driving voltage of described LED backlight unit, described LED-backlit device also comprises above-mentioned LED backlight drive circuit, and described LED backlight drive circuit is for driving described LED backlight circuit;
Second end of described at least one road back light unit is connected with the reference voltage providing unit that described LED backlight drive circuit comprises;
The thermo-compensator unit that second end of described LED backlight unit also comprises with described LED backlight drive circuit is connected.
During enforcement, described LED backlight circuit can comprise red LED back light unit, green LED back light unit and blue led back light unit, and now LED backlight circuit is mixed light backlight circuit
Described red LED back light unit comprises the red LED of multiple series aiding connection;
Described green LED back light unit comprises the green LED of multiple series aiding connection;
Described blue led back light unit comprises the blue led of multiple series aiding connection.
During enforcement, described LED backlight circuit only can comprise a road monochromatic LED back light unit;
Described monochromatic LED back light unit comprises the monochromatic LED of multiple series aiding connection, and the glow color of the monochromatic LED of described multiple series aiding connection is identical.
During enforcement, described monochromatic LED can be red LED, green LED, blue led or white light LEDs.
Concrete, as shown in Figure 4, in the LED-backlit device described in the embodiment of the present invention, described LED backlight circuit only comprises a road monochromatic LED back light unit L1;
Described monochromatic LED back light unit L1 comprises the monochromatic LED of multiple series aiding connection, and the glow color of the monochromatic LED of described multiple series aiding connection is identical;
Described LED backlight drive circuit comprises reference voltage providing unit (not shown in Fig. 4) and thermo-compensator unit;
The anode tap access LEF anode drive voltage V of described monochromatic LED back light unit L1
lED+;
Described reference voltage providing unit provides LED cathode drive voltage V for the cathode terminal of described monochromatic LED back light unit L1
lED-;
Described thermo-compensator unit comprises the first resistance R1 parallel with one another and has the first thermistor Rx1 of positive temperature coefficient (PTC);
One end of described thermo-compensator unit is connected with the cathode terminal of described monochromatic LED back light unit L1, and the other end of described thermo-compensator unit holds GND to be connected with ground;
In the embodiment of LED-backlit device as shown in Figure 4, described monochromatic LED can be red LED, green LED, blue led or white light LEDs.
During enforcement, described LED backlight unit also can comprise multiple LED backlight module of connecting successively;
Each LED backlight module comprises at least two monochromatic LEDs in parallel in the same way;
The glow color of all monochromatic LEDs in described LED backlight unit is identical.
Concrete, as shown in Figure 5, in the LED-backlit device described in the embodiment of the present invention, described LED backlight circuit only comprises a road monochromatic LED back light unit L2;
Described monochromatic LED back light unit L2 comprises multiple LED backlight module of connecting successively;
LED backlight module described in each comprises two monochromatic LEDs in parallel in the same way;
The glow color of all monochromatic LEDs that described monochromatic LED back light unit comprises is identical;
Described LED backlight drive circuit comprises reference voltage providing unit (not shown in Fig. 4) and thermo-compensator unit;
The anode tap access LEF anode drive voltage V of described monochromatic LED back light unit L2
lED+;
Described reference voltage providing unit provides LED cathode drive voltage V for the cathode terminal of described monochromatic LED back light unit L2
lED-;
Described thermo-compensator unit comprises the first resistance R1 parallel with one another and has the first thermistor Rx1 of positive temperature coefficient (PTC);
One end of described thermo-compensator unit is connected with the cathode terminal of described monochromatic LED back light unit L2, and the other end of described thermo-compensator unit holds GND to be connected with ground.
Present invention also offers a kind of display device, comprise above-mentioned LED-backlit device.
Concrete, described display device can comprise liquid crystal indicator, such as liquid crystal panel, LCD TV, mobile phone, liquid crystal display.Except liquid crystal indicator, described display device can also comprise the display device of other types, such as electronic reader etc.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a LED backlight drive circuit, for driving LED backlight circuit, described LED backlight circuit comprises at least one paths of LEDs back light unit, the first end access LED driving voltage of described LED backlight unit, described LED backlight drive circuit comprises the reference voltage providing unit for providing preset reference voltage for the second end of described at least one paths of LEDs back light unit, it is characterized in that, described LED backlight drive circuit also comprises at least one thermo-compensator unit;
Described thermo-compensator unit, is connected between the second end of described LED backlight unit and a level output end;
The resistance value of described thermo-compensator unit increases along with the rising of temperature, and the resistance value of described thermo-compensator unit reduces along with the reduction of temperature.
2. LED backlight drive circuit as claimed in claim 1, it is characterized in that, described thermo-compensator unit comprises regulating resistance parallel with one another and thermistor;
Described thermistor has positive temperature coefficient (PTC).
3. LED backlight drive circuit as claimed in claim 1, it is characterized in that, described thermo-compensator unit comprises the thermistor with positive temperature coefficient (PTC).
4. the LED backlight drive circuit as described in claim arbitrary in claims 1 to 3, is characterized in that, described reference voltage providing unit comprises PWM control module and at least one operational amplifier;
Described operational amplifier, positive input access preset reference voltage, negative input is connected with the second end of LED backlight unit described in, control end access pulse width modulated duty cycle signal, and output terminal is connected with described PWM control module;
Described PWM control module, for the output signal according to described at least one operational amplifier, produces LED driving voltage.
5. a LED-backlit device, comprises LED backlight circuit, and described LED backlight circuit comprises at least one paths of LEDs back light unit; The first end access LED driving voltage of described LED backlight unit, it is characterized in that, described LED-backlit device also comprises the LED backlight drive circuit as described in claim arbitrary in Claims 1-4, and described LED backlight drive circuit is for driving described LED backlight circuit;
Second end of described at least one road back light unit is connected with the reference voltage providing unit that described LED backlight drive circuit comprises;
The thermo-compensator unit that second end of described LED backlight unit also comprises with described LED backlight drive circuit is connected.
6. LED-backlit device as claimed in claim 5, it is characterized in that, described LED backlight circuit comprises red LED back light unit, green LED back light unit and blue led back light unit;
Described red LED back light unit comprises the red LED of multiple series aiding connection;
Described green LED back light unit comprises the green LED of multiple series aiding connection;
Described blue led back light unit comprises the blue led of multiple series aiding connection.
7. LED-backlit device as claimed in claim 5, it is characterized in that, described LED backlight circuit comprises a road monochromatic LED back light unit;
Described monochromatic LED back light unit comprises the monochromatic LED of multiple series aiding connection, and the glow color of the monochromatic LED of described multiple series aiding connection is identical.
8. LED-backlit device as claimed in claim 7, it is characterized in that, described monochromatic LED is red LED, green LED, blue led or white light LEDs.
9. LED-backlit device as claimed in claim 5, it is characterized in that, described LED backlight unit comprises multiple LED backlight module of connecting successively;
Each LED backlight module comprises at least two monochromatic LEDs in parallel in the same way;
The glow color of all monochromatic LEDs in described LED backlight unit is identical.
10. a display device, is characterized in that, comprises the LED-backlit device as described in claim arbitrary in claim 5 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410670823.5A CN104376816A (en) | 2014-11-21 | 2014-11-21 | LED backlight drive circuit, LED backlight device and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410670823.5A CN104376816A (en) | 2014-11-21 | 2014-11-21 | LED backlight drive circuit, LED backlight device and display device |
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|---|---|
| CN104376816A true CN104376816A (en) | 2015-02-25 |
Family
ID=52555695
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410670823.5A Pending CN104376816A (en) | 2014-11-21 | 2014-11-21 | LED backlight drive circuit, LED backlight device and display device |
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| CN (1) | CN104376816A (en) |
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| CN110189709A (en) * | 2018-02-23 | 2019-08-30 | 京东方科技集团股份有限公司 | Control circuit, backlight drive device and display equipment |
| CN112037711A (en) * | 2020-09-11 | 2020-12-04 | 京东方科技集团股份有限公司 | Driving device and driving method of display panel and display device |
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Application publication date: 20150225 |
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