CN204423880U - A kind of LED backlight drive circuit of liquid crystal TV set - Google Patents
A kind of LED backlight drive circuit of liquid crystal TV set Download PDFInfo
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- CN204423880U CN204423880U CN201420483702.5U CN201420483702U CN204423880U CN 204423880 U CN204423880 U CN 204423880U CN 201420483702 U CN201420483702 U CN 201420483702U CN 204423880 U CN204423880 U CN 204423880U
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Abstract
The LED backlight drive circuit of a kind of liquid crystal TV set that the utility model provides, comprise the first backlight string, the second backlight string, filter capacitor, play current detecting effect resistance, for be galvanic AC/DC power transfer module by AC conversion, the first rectification filtering module, switching tube, be used for regulating the constant-current control module of back facet current, the boost module of the process that is used for carrying out boosting and the second rectification filtering module; Two-way voltage U 1 and U2 is exported by AC/DC power transfer module, by voltage U 2 for backlight string provides most of power supply, the electric current of backlight string is detected by constant-current control module, and according to the Current Control boost module detected, voltage U 1 is boosted to voltage U L to backlight statements based on collusion electricity, thus the current constant control achieved backlight string, reduce the voltage stress of boost module electronic devices and components, simplify LED backlight drive circuit, not only save circuit cost, also improve reliability.
Description
Technical field
The utility model relates to LCD TV field, particularly a kind of LED backlight drive circuit of liquid crystal TV set.
Background technology
Some large-sized LED-backlit liquid crystal display in the market, backlight portion is two string high-voltage LEDs, and the voltage error between two string LED is larger, and the electric current of two string LED needs identical.Drive such backlight, current reasonable technology is that employing two booster circuits drive every a string LED to realize respectively, its circuit theory diagrams as shown in Figure 1, specifically comprise separate AC/DC power supply 01, first booster circuit 02, second booster circuit 03, first backlight string LED1, the second backlight string LED2, the first light modulation pipe 04, second light modulation pipe 05, first detection resistance R1, second detect resistance R2 and two-way current constant control IC06.
As shown in Figure 1, the LED backlight drive circuit of the liquid crystal TV set of prior art, by separate AC/DC power supply 01, convert the alternating voltage of net electricity to two parts DC voltage, part of direct current pressure is exported by the 3rd output terminal of separate AC/DC power supply 01 and the 4th output terminal, its output voltage is that 12V powers to signal processing circuit, sound accompaniment, liquid crystal display, can certainly be 5V or other voltage; Another part DC voltage is exported by the first output terminal of separate AC/DC power supply 01 and the second output terminal, its output voltage is U2, power to backlight drive circuit, wherein, U2 is changed the voltage U L1 turned to needed for the first backlight string LED1 by the first booster circuit 02, powers to the first backlight string LED1; U2 is changed the voltage U L2 turned to needed for the second backlight string LED2 by the second booster circuit 03, powers to the second backlight string LED2.First light modulation pipe 04 and the second light modulation pipe 05 are respectively used to the brightness of adjustment first backlight string LED1 and the second backlight string LED2.First detects resistance R1 and second detects the electric current that resistance R2 is respectively used to detection first backlight string LED1 and the second backlight string LED2.Two-way current constant control IC06 is by control first booster circuit 02, second booster circuit 03, first light modulation pipe 04 and the second light modulation pipe 05, the electric current of the first backlight string LED1 and the second backlight string LED2 is consistent, to realize complete backlight drive circuit function.
The LED backlight drive circuit of available liquid crystal televisor needs two booster circuits, device withstand voltage used on backlight drive circuit is all high than a string LED electrical pressure, and two-way current constant control IC function is complicated, electronic devices and components cost is high, take board area large, be unfavorable for that electronic product is lightening, therefore, prior art haves much room for improvement.
Utility model content
In view of above-mentioned the deficiencies in the prior art part, the purpose of this utility model is the LED backlight drive circuit providing a kind of liquid crystal TV set, only need booster circuit can realize the power supply to two groups of backlight strings, and the electric current of two groups of backlight strings can be kept consistent.
In order to achieve the above object, the utility model takes following technical scheme:
A LED backlight drive circuit for liquid crystal TV set, comprising:
First backlight string;
Second backlight string;
Filter capacitor;
Play the resistance of current detecting effect;
Switching tube;
First rectification filtering module;
Second rectification filtering module;
For being galvanic AC/DC power transfer module by AC conversion;
For carrying out the boost module processed that boosts;
For regulating the constant-current control module of back facet current;
First output terminal of described AC/DC power transfer module is connected the positive pole of the first backlight string and the negative pole of the second backlight string with the second output terminal by the first rectification filtering module, the first end of the negative pole connecting valve pipe of described first backlight string, second end of switching tube connects the first end of constant-current control module, second end of the three-terminal link constant-current control module of switching tube, one end of filter capacitor is also connected by resistance, the first end of boost module and the first earth point of LED backlight drive circuit, the other end of described filter capacitor connects the second end of boost module and the positive pole of the second backlight string, 3rd end of described boost module also connects the 3rd end of constant-current control module, 3rd output terminal of described AC/DC power transfer module and the 4th output terminal are connected the 4th end and five terminal of boost module by the second rectification filtering module.
In the LED backlight drive circuit of described liquid crystal TV set, described second rectification filtering module comprises the first diode and the first electric capacity, the positive pole of described first diode connects the 3rd output terminal of AC/DC power transfer module, state the 4th end of boost module and one end of the first electric capacity described in the negative pole connection of described first diode, the other end of described first electric capacity is connected the second earth point of LED backlight drive circuit with the 4th output terminal of AC/DC power transfer module.
In the LED backlight drive circuit of described liquid crystal TV set, described first earth point and the second earth point are not altogether.
In the LED backlight drive circuit of described liquid crystal TV set, described first rectification filtering module comprises the second diode and the second electric capacity, the positive pole of described second diode connects the first output terminal of AC/DC power transfer module, the positive pole of described second diode connects one end of the second electric capacity and the positive pole of the first LED string, and the other end of described second electric capacity is connected the negative pole of the second LED string with the second output terminal of AC/DC power transfer module.
In the LED backlight drive circuit of described liquid crystal TV set, described switching tube is metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor connects the first end of constant-current control module, the drain electrode of metal-oxide-semiconductor connects the negative pole of the first backlight string, and the source electrode of metal-oxide-semiconductor connects one end of the first earth point and filter capacitor by the first resistance.
In the LED backlight drive circuit of described liquid crystal TV set, described metal-oxide-semiconductor is N metal-oxide-semiconductor.
In the LED backlight drive circuit of described liquid crystal TV set, described first backlight string and the second backlight string compose in series by some LED light emitting diodes.
In the LED backlight drive circuit of described liquid crystal TV set, described constant-current control module comprises a single channel current constant control IC.
Compared to prior art, the LED backlight drive circuit of a kind of liquid crystal TV set that the utility model provides, by AC/DC power transfer module by the first rectification filtering module for two series connection backlight string power supply is provided, and the backlight crosstalk pressure that just can maintain two series connection by means of only a boost module is consistent, two backlight crosstalk streams are maintained consistent by constant-current control module, decrease a boost module and reduce the power load of boost module, reduce the voltage stress of driving circuit electronic devices and components, greatly can reduce circuit cost.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the LED backlight drive circuit of the liquid crystal TV set of prior art.
The circuit diagram of the LED backlight drive circuit of the liquid crystal TV set that Fig. 2 provides for the utility model.
The equivalent circuit diagram of the LED backlight drive circuit of the liquid crystal TV set that Fig. 3 provides for the utility model.
Embodiment
The utility model provides a kind of LED backlight drive circuit of liquid crystal TV set, power supply is provided by AC/DC power transfer module, two groups of backlight crosstalk pressures are maintained consistent by a boost module, it is consistent that constant-current control module maintains two groups of backlight crosstalk streams, reduce a booster circuit, save the cost of electronic devices and components, reduce the volume of LED backlight drive circuit.
For making the purpose of this utility model, technical scheme and effect clearly, clearly, referring to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 2, the LED backlight drive circuit of the liquid crystal TV set that the utility model provides, comprising: the first backlight string LED1, the second backlight string LED2, filter capacitor CL, play current detecting effect resistance R1, for be galvanic AC/DC power transfer module 10, first rectification filtering module 20 by AC conversion, switching tube 30, be used for regulating the constant-current control module 40 of back facet current, the boost module 50 of the process that is used for carrying out boosting and the second rectification filtering module 60.
First output terminal of described AC/DC power transfer module 10 is connected the positive pole of the first backlight string LED1 and the negative pole of the second backlight string LED2 with the second output terminal by the first rectification filtering module 20, the first end of the negative pole connecting valve pipe 30 of described first backlight string LED1, second end of switching tube 30 connects the first end of constant-current control module 40, second end of the three-terminal link constant-current control module 40 of switching tube 30, one end of filter capacitor CL is also connected by resistance R1, the first end of boost module 50 and the first earth point GND1 of LED backlight drive circuit, the other end of described filter capacitor CL connects the second end of boost module 50 and the positive pole of the second backlight string LED2, 3rd end of described boost module 50 also connects the 3rd end of constant-current control module 40, 3rd output terminal of described AC/DC power transfer module 10 and the 4th output terminal are connected the 4th end and five terminal of boost module 50 by the second rectification filtering module 60.
The alternating voltage of net electricity is converted into U1 and U2 two DC voltage by described AC/DC power transfer module 10, and wherein, voltage U 2, after the first rectification filtering module 20 rectifying and wave-filtering, powers to the first backlight string LED1 of series connection and the second backlight string LED2; Voltage U 1 is after the second rectification filtering module 60 rectifying and wave-filtering, export to other circuit such as boost module 50 and signal processing circuit, sound accompaniment, liquid crystal display to power, wherein, the voltage U 1 of input is boosted and is exported to the first backlight string LED1 for voltage U L and the second backlight string LED2 powers by described boost module 50.Described constant-current control module 40 is connected with boost module 50 and switching tube 30, be responsible for the electric current controlling boost module 50 and regulate the first backlight string LED1 and the second backlight string LED2, described switching tube 30 controls the opening and closing of the LED backlight drive circuit of described liquid crystal TV set.
When described switching tube 30 is opened, filter capacitor CL there is fixed voltage UL, the second electric capacity C2 has fixed voltage U2.When switching tube 30 conducting, the first backlight string LED1, switching tube 30, resistance R1, filter capacitor CL, the second backlight string LED2, the second electric capacity C2 form a closed path loop, and whole backlight all can have electric current to flow through, and equivalent electrical circuit as shown in Figure 3.See also Fig. 2 and Fig. 3, described first backlight string LED1 and the second backlight string LED2 connects, its current flowing resistance R1, and detected by constant-current control module 40, constant-current control module 40 is according to the signal that resistance R1 detects, control boost module 50 to work, maintain the constant of the first backlight string LED1 and the second backlight string LED2 electric current.When switching tube 30 disconnects, the LED backlight drive circuit of described liquid crystal TV set disconnects, and the first backlight string LED1 and the second backlight string LED2 no current flow through, and cannot form closed-loop path, flow through so resistance R1 does not have electric current yet, reach the function of adjusting backlight luminance.In the LED backlight drive circuit of the liquid crystal TV set that the utility model provides, the power that described boost module 50 will provide equals voltage U L and is multiplied by back facet current, usual voltage U L is less than voltage U 2, most of energy of backlight is directly provided by voltage U 2, thus, the LED backlight drive circuit of the liquid crystal TV set that the utility model provides, can reduce by a boost module compared to prior art and reduce the power load of boost module, reduce the voltage stress of boost module electronic devices and components, greatly can reduce circuit cost.
Refer to Fig. 2, described second rectification filtering module 60 comprises the first diode D1 and the first electric capacity C1, the positive pole of described first diode D1 connects the 3rd output terminal of AC/DC power transfer module 10, state the circuit such as the 4th end of boost module 50, one end of the first electric capacity C1 and signal processing circuit, sound accompaniment, liquid crystal display described in the negative pole connection of described first diode D1, the other end of described first electric capacity C1 is connected the second earth point GND2 of LED backlight drive circuit with the 4th output terminal of AC/DC power transfer module 10.The voltage U 1 exported by the 3rd output terminal and the 4th output terminal of described second rectification filtering module 60 pairs of AC/DC power transfer module 10 carries out rectification and filtering; make voltage U 1 more reliable and more stable, effectively protect the safety of LED backlight drive circuit electronic devices and components.
Further, in the LED backlight drive circuit of the liquid crystal TV set that the utility model provides, not altogether, the utility model, by arranging two-stage ground, avoids the signal disturbing of other circuit of TV and LED backlight drive circuit to described first earth point GND1 and the second earth point GND2.
Please continue to refer to Fig. 2, described first rectification filtering module 20 comprises the second diode D2 and the second electric capacity C2, the positive pole of described second diode D2 connects the first output terminal of AC/DC power transfer module 10, the positive pole of described second diode D2 connects one end of the second electric capacity C2 and the positive pole of the first LED string LED1, and the described other end of the second electric capacity C2 is connected the negative pole of the second LED string LED2 with the second output terminal of AC/DC power transfer module 10.The voltage U 2 exported by the first output terminal and second output terminal of described first rectification filtering module 20 pairs of AC/DC power transfer module 10 carries out rectification and filtering; make voltage U 2 more reliable and more stable, effectively protect the safety of LED backlight drive circuit electronic devices and components.
In the LED backlight drive circuit of the liquid crystal TV set that the utility model provides, described switching tube 30 is metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor connects the first end of constant-current control module 40, the drain electrode of metal-oxide-semiconductor connects the negative pole of the first backlight string LED1, and the source electrode of metal-oxide-semiconductor connects one end of the first earth point GND1 and filter capacitor CL by the first resistance R1.
Further, described switching tube 30 is N metal-oxide-semiconductor; Certainly, described switching tube 30 also can be that P metal-oxide-semiconductor adds phase inverter or NPN type triode, as long as the first end that can realize constant-current control module 40 exports high level, the first end of gauge tap pipe 30 and the 3rd end conducting.
The first described backlight string LED1 and the second backlight string LED2 composes in series by some LED light emitting diodes, and certain backlight string is also not limited only to two groups, also can be three groups or more, and only needing correspondingly increases boost module.
Described constant-current control module 40 comprises a single channel current constant control IC, and the model that described single channel current constant control IC can adopt concavo-convex scientific & technical corporation to produce is the chip of OZ9902C, the model of Can Rui scientific & technical corporation production is the IC of the chip of OCP8121 or the identity function of other chip producers.For OZ9902C chip, when being applied in the utility model, the 12nd pin of OZ9902C is connected booster circuit with the 15th pin, and the 11st pin connects the grid of metal-oxide-semiconductor, the source electrode of the 10th pin contact resistance R1 and metal-oxide-semiconductor.
The LED backlight drive circuit of the liquid crystal TV set that the utility model provides, two-way voltage U 1 and U2 is exported by AC/DC power transfer module, voltage U 2 provides most of power supply for backlight string, the electric current of LED backlight drive circuit is detected by arranging a constant-current control module, and according to the Current Control boost module detected, voltage U 1 is boosted to voltage U L, voltage U L is to backlight statements based on collusion electricity, thus the current constant control achieved LED backlight drive circuit, the LED backlight drive circuit that the utility model provides only needs a boost module, and the power load of boost module is little, reduce the voltage stress of boost module electronic devices and components, simplify LED backlight drive circuit, not only save circuit cost, also improve the reliability of circuit.
Refer to Fig. 1 and Fig. 2, below lift an Application Example and the method that the LED backlight drive circuit of liquid crystal TV set of the present utility model reduces boost module power and voltage stress is illustrated:
Suppose that the voltage of the first backlight string LED1 and the second backlight string LED2 is 200V, electric current is 150mA, if adopt LED backlight drive circuit as shown in Figure 1, the power of the first booster circuit 02 and the second booster circuit 03 is: 200V × 0.15A=30W, the electronic devices and components of the first booster circuit 02 and the second booster circuit 03 are withstand voltage needs more than 200V, and need to use two output filter capacitors (CL1 and CL2), two light modulation pipes (light modulation pipe 04 and light modulation pipe 05), a two-way current constant control IC06.And the LED backlight drive circuit adopting the utility model to provide, as shown in Figure 2, as long as voltage U 2 is set to 350V, voltage U L is set to 50V, only need the boost module 50 of a 50V × 0.15A=7.5W, electronic devices and components withstand voltage need of boost module 50 are greater than 50V, and most of power (30W × 2-7.5W=52.5W) of the first backlight string LED1 and the second backlight string LED2 is directly provided by AC-DC power transfer module 10.Adopt the LED backlight drive circuit of prior art, all energy of backlight group all will transform through booster circuit, and the LED backlight drive circuit that the utility model provides is by the power of the overwhelming majority and voltage (52.5W, 350V) be directly transported to backlight group from AC-DC power transfer module, only have small part power and voltage (7.5W, 50V) changed by boost module, not only reduce a boost module, a switch light and a filter capacitor, and the withstand voltage of boost module electronic devices and components is reduced greatly, save the cost of whole circuit, improve efficiency and the stability of circuit.
Be understandable that; for those of ordinary skills; can be equal to according to the technical solution of the utility model and utility model design thereof and replace or change, and all these change or replace the protection domain that all should belong to the claim appended by the utility model.
Claims (8)
1. a LED backlight drive circuit for liquid crystal TV set, is characterized in that, comprising:
First backlight string;
Second backlight string;
Filter capacitor;
Play the resistance of current detecting effect;
Switching tube;
First rectification filtering module;
Second rectification filtering module;
For being galvanic AC/DC power transfer module by AC conversion;
For carrying out the boost module processed that boosts;
For regulating the constant-current control module of back facet current;
First output terminal of described AC/DC power transfer module is connected the positive pole of the first backlight string and the negative pole of the second backlight string with the second output terminal by the first rectification filtering module, the first end of the negative pole connecting valve pipe of described first backlight string, second end of switching tube connects the first end of constant-current control module, second end of the three-terminal link constant-current control module of switching tube, one end of filter capacitor is also connected by resistance, the first end of boost module and the first earth point of LED backlight drive circuit, the other end of described filter capacitor connects the second end of boost module and the positive pole of the second backlight string, 3rd end of described boost module also connects the 3rd end of constant-current control module, 3rd output terminal of described AC/DC power transfer module and the 4th output terminal are connected the 4th end and five terminal of boost module by the second rectification filtering module.
2. the LED backlight drive circuit of liquid crystal TV set according to claim 1, it is characterized in that, described second rectification filtering module comprises the first diode and the first electric capacity, the positive pole of described first diode connects the 3rd output terminal of AC/DC power transfer module, state the 4th end of boost module and one end of the first electric capacity described in the negative pole connection of described first diode, the other end of described first electric capacity is connected the second earth point of LED backlight drive circuit with the 4th output terminal of AC/DC power transfer module.
3. the LED backlight drive circuit of liquid crystal TV set according to claim 2, is characterized in that, described first earth point and the second earth point are not altogether.
4. the LED backlight drive circuit of liquid crystal TV set according to claim 1, it is characterized in that, described first rectification filtering module comprises the second diode and the second electric capacity, the positive pole of described second diode connects the first output terminal of AC/DC power transfer module, the positive pole of described second diode connects one end of the second electric capacity and the positive pole of the first LED string, and the other end of described second electric capacity is connected the negative pole of the second LED string with the second output terminal of AC/DC power transfer module.
5. the LED backlight drive circuit of liquid crystal TV set according to claim 1, it is characterized in that, described switching tube is metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor connects the first end of constant-current control module, the drain electrode of metal-oxide-semiconductor connects the negative pole of the first backlight string, and the source electrode of metal-oxide-semiconductor connects one end of the first earth point and filter capacitor by the first resistance.
6. the LED backlight drive circuit of liquid crystal TV set according to claim 5, is characterized in that, described metal-oxide-semiconductor is N metal-oxide-semiconductor.
7. the LED backlight drive circuit of liquid crystal TV set according to claim 1, is characterized in that, described first backlight string and the second backlight string compose in series by some LED light emitting diodes.
8. the LED backlight drive circuit of liquid crystal TV set according to claim 1, is characterized in that, described constant-current control module comprises a single channel current constant control IC.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420483702.5U CN204423880U (en) | 2014-08-26 | 2014-08-26 | A kind of LED backlight drive circuit of liquid crystal TV set |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420483702.5U CN204423880U (en) | 2014-08-26 | 2014-08-26 | A kind of LED backlight drive circuit of liquid crystal TV set |
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| CN201420483702.5U Expired - Lifetime CN204423880U (en) | 2014-08-26 | 2014-08-26 | A kind of LED backlight drive circuit of liquid crystal TV set |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105357810A (en) * | 2015-12-14 | 2016-02-24 | 青岛歌尔声学科技有限公司 | Liquid crystal television LED drive circuit |
| CN106354075A (en) * | 2016-11-25 | 2017-01-25 | 北京意同创科技有限公司 | Remote controller control circuit with backlight screen |
| CN106782349A (en) * | 2017-01-04 | 2017-05-31 | 深圳市华星光电技术有限公司 | A kind of LED backlight drive circuit and liquid crystal display |
| CN108364613A (en) * | 2018-02-07 | 2018-08-03 | 青岛海信电器股份有限公司 | LED backlight drive circuit, LED backlight, television terminal |
| CN112216245A (en) * | 2020-10-09 | 2021-01-12 | 深圳创维－Rgb电子有限公司 | Adjusting circuit and method for module backlight lamp bar of television |
| CN112542141A (en) * | 2020-12-01 | 2021-03-23 | Tcl华星光电技术有限公司 | Display device and driving method thereof |
| CN113436571A (en) * | 2020-03-18 | 2021-09-24 | 海信视像科技股份有限公司 | Display device and power supply circuit |
| CN114664242A (en) * | 2022-04-14 | 2022-06-24 | 深圳创维－Rgb电子有限公司 | Backlight constant-current control circuit and television |
-
2014
- 2014-08-26 CN CN201420483702.5U patent/CN204423880U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105357810A (en) * | 2015-12-14 | 2016-02-24 | 青岛歌尔声学科技有限公司 | Liquid crystal television LED drive circuit |
| CN106354075A (en) * | 2016-11-25 | 2017-01-25 | 北京意同创科技有限公司 | Remote controller control circuit with backlight screen |
| US10448468B2 (en) | 2017-01-04 | 2019-10-15 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | LED backlight driving circuit and liquid crystal display |
| CN106782349A (en) * | 2017-01-04 | 2017-05-31 | 深圳市华星光电技术有限公司 | A kind of LED backlight drive circuit and liquid crystal display |
| US10397994B2 (en) | 2017-01-04 | 2019-08-27 | Shenzhen China Star Optoelectronics Technology Co., Ltd | LED backlight driving circuit and liquid crystal display |
| CN108364613B (en) * | 2018-02-07 | 2020-03-06 | 青岛海信电器股份有限公司 | LED backlight drive circuit, LED backlight lamp and television terminal |
| CN108364613A (en) * | 2018-02-07 | 2018-08-03 | 青岛海信电器股份有限公司 | LED backlight drive circuit, LED backlight, television terminal |
| CN113436571A (en) * | 2020-03-18 | 2021-09-24 | 海信视像科技股份有限公司 | Display device and power supply circuit |
| CN113436571B (en) * | 2020-03-18 | 2022-10-18 | 海信视像科技股份有限公司 | Display device and power supply circuit |
| CN112216245A (en) * | 2020-10-09 | 2021-01-12 | 深圳创维－Rgb电子有限公司 | Adjusting circuit and method for module backlight lamp bar of television |
| CN112542141A (en) * | 2020-12-01 | 2021-03-23 | Tcl华星光电技术有限公司 | Display device and driving method thereof |
| US11705055B2 (en) | 2020-12-01 | 2023-07-18 | Tcl China Star Optoelectronics Technology Co., Ltd. | Display device and method of driving thereof |
| CN114664242A (en) * | 2022-04-14 | 2022-06-24 | 深圳创维－Rgb电子有限公司 | Backlight constant-current control circuit and television |
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