CN112599102A - LED lamp driving circuit, backlight device and display system - Google Patents
LED lamp driving circuit, backlight device and display system Download PDFInfo
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- CN112599102A CN112599102A CN202011435575.8A CN202011435575A CN112599102A CN 112599102 A CN112599102 A CN 112599102A CN 202011435575 A CN202011435575 A CN 202011435575A CN 112599102 A CN112599102 A CN 112599102A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
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- Engineering & Computer Science (AREA)
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- Theoretical Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention relates to the field of circuit control, in particular to an LED lamp driving circuit, a backlight device and a display system, wherein the driving circuit comprises: a forward power supply terminal; a negative power supply terminal; the boosting circuit is connected between the forward power supply end and the LED lamp to be driven in series; the negative voltage circuit is connected between the positive power supply end and the LED lamp to be driven in series; the boosting circuit is used for controlling forward voltage provided by a forward power supply end to the LED lamp; the negative voltage circuit is used for controlling a negative voltage supplied to the LED lamp by a negative power supply end; the boosting circuit and the negative voltage circuit jointly modulate the magnitude of the driving voltage loaded on the LED lamp. After the negative voltage circuit provides negative voltage for the LED lamp, the negative voltage circuit improves the stability of the circuit so as to reduce the loss of parts in the high-voltage circuit and increase the service life of the parts of the circuit; in addition, the design of the negative voltage circuit makes each part in the circuit unnecessary to use the part with better specification, thereby reducing the cost.
Description
Technical Field
The invention relates to the field of circuit control, in particular to an LED lamp driving circuit, a backlight device and a display system.
Background
In the existing LED backlight driving circuit technology, a Boost circuit (the Boost converter — a switching dc Boost circuit) is usually used to supply power to the LED, and increasing the voltage of the backlight driving input end through the Boost circuit easily increases the instability of the circuit and increases the loss of each part in the circuit, so that the service life of the part is shortened; in addition, a single-string high-voltage power supply circuit requires high specifications for each part, which increases the cost.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a circuit that improves the stability of the circuit and the life of the circuit elements.
The purpose of the invention is realized by the following technical scheme:
the invention provides an LED lamp driving circuit, comprising: a forward power supply terminal; a negative power supply terminal; the boosting circuit is connected between the forward power supply end and the LED lamp to be driven in series; the negative voltage circuit is connected between the positive power supply end and the LED lamp to be driven in series; the boosting circuit is used for controlling forward voltage provided by a forward power supply end to the LED lamp; the negative voltage circuit is used for controlling a negative voltage supplied to the LED lamp by a negative power supply end; the boosting circuit and the negative voltage circuit jointly modulate the magnitude of the driving voltage loaded on the LED lamp.
Further, the booster circuit includes: the circuit comprises a first inductor, a second inductor, a first diode, a first MOS (metal oxide semiconductor) tube and a first resistor; the first end of the first inductor is connected with the positive power supply input end, the second end of the first inductor is connected with the anode of the first diode through the second inductor, and the cathode of the first diode is connected with the anode of the LED lamp; the grid electrode of the first MOS tube is used for inputting PWM control signals, the drain electrode of the first MOS tube is connected with the interconnection ends of the first inductor and the second inductor, and the source electrode of the first MOS tube is grounded through the first resistor.
Further, the booster circuit further includes: the first input filter circuit is connected with the forward power supply end and is used for filtering the power supply input by the forward power supply end; and the first output filter circuit is connected with the cathode of the first diode and the common end of the anode of the LED lamp and is used for filtering the power supply output to the LED lamp.
Further, the first input filter circuit comprises a first capacitor, and the first output filter circuit comprises a second capacitor; the first end of the first capacitor is connected with the positive power supply input end, and the second end of the first capacitor is grounded; the first end of the second capacitor is connected with the cathode of the first diode, and the second end of the second capacitor is grounded.
Further, one end of the second capacitor close to the first diode D1 is also connected to the positive electrode of the LED lamp and provides a forward voltage for the LED lamp.
Further, the negative voltage circuit includes: the third inductor, the third capacitor, the fourth capacitor, the second diode and the second MOS tube; the grid electrode of the second MOS tube is used for inputting a PWM control signal, the drain electrode of the second MOS tube is connected with the negative power supply input end, the source electrode of the second MOS tube is connected with the cathode of a second diode, and the anode of the second diode is connected with the cathode of the LED lamp; the first end of the third inductor is connected with the second MOS tube and the interconnection end of the second diode, and the second end of the third inductor is grounded.
Further, the negative voltage circuit further comprises: the second input filter circuit is connected with the negative power supply end and is used for filtering the power supply input by the negative power supply end; and the second output filter circuit is connected with the anode of the second diode and the common end of the cathode of the LED lamp and is used for filtering the power supply output to the LED lamp.
Further, the second input filter circuit comprises a third capacitor, and the second output filter circuit comprises a fourth capacitor; the first end of the third capacitor is connected with the negative power supply input end, and the second end of the third capacitor is grounded; the first end of the fourth capacitor is connected with the anode of the second diode, and the second end of the fourth capacitor is grounded.
The invention also provides a backlight device which comprises the LED driving circuit.
The invention also proposes a display system comprising: a display device and the backlight device; the display device comprises a display screen; the backlight device is arranged in the display system and is connected with the display screen.
The invention has the beneficial effects that: the positive end of the LED lamp is connected with the booster circuit to provide positive voltage for the LED lamp, the negative end of the LED lamp is connected with the negative circuit to provide negative voltage for the LED lamp, and the stability of the backlight driving circuit is improved through the common modulation of the booster circuit and the negative circuit; after the booster circuit provides positive voltage for the LED lamp, the negative voltage provided by the negative voltage circuit prevents circuit elements from continuously working under the condition of high voltage only, so that the loss of parts in the circuit increased by the high voltage circuit is reduced, and the service life of the parts of the circuit is increased; each element of the circuit can work more stably under the condition of low voltage, so that the stability of the driving circuit can be improved by designing a negative voltage circuit; in addition, the design of the negative voltage circuit makes each part in the backlight driving circuit unnecessary to use parts with better specifications, thereby reducing the cost.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a circuit schematic diagram of an LED lamp driving circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an LED lamp driving circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a backlight device provided by an embodiment of the present invention;
fig. 4 is a schematic illustration of a display system provided by an embodiment of the present invention.
Reference numerals: 101-a booster circuit, 102-a negative voltage circuit, 103-a booster circuit module, 104-a negative voltage circuit module, 105-an LED lamp and 106-a display screen.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 2, an LED lamp driving circuit includes: a forward power supply terminal; a negative power supply terminal; a booster circuit 101 connected in series between a forward power source terminal and the LED lamp 105 to be driven; and a negative voltage circuit 102 connected in series between the positive power source terminal and the LED lamp 105 to be driven; a booster circuit 101 for controlling a forward voltage supplied from a forward power source terminal to the LED lamp 105; a negative voltage circuit 102 for controlling a negative voltage supplied from a negative power supply terminal to the LED lamp 105; the boosting circuit 101 and the negative voltage circuit 102 together modulate the magnitude of the driving voltage applied to the LED lamp 105.
In the embodiment, the boosting circuit 101 is connected in series between a forward power supply end and the to-be-driven LDE lamp, and the boosting circuit 101 is connected with the positive end of the LED lamp 105 to provide forward voltage for the LED lamp 105; the negative voltage circuit 102 is connected in series between a negative power supply end and the LDE lamp to be driven, and the negative voltage circuit 102 is connected with the negative end of the LED lamp 105 to supply negative voltage to the LED lamp 105; the stability of the backlight driving circuit is improved by the common modulation of the boosting circuit 101 and the negative voltage circuit 102.
After the boost circuit 101 provides the forward voltage for the LED lamp 105, because the single-string power supply circuit with the high voltage has a higher voltage, the boost circuit loads one negative voltage circuit 102, so that the voltage loaded on the LED lamp 105 is reduced; the negative voltage provided by the negative voltage circuit 102 prevents the circuit elements from continuously working under the condition of high voltage only, so that the consumption of each part in the circuit increased by the high voltage circuit is reduced, and the service life of each part of the circuit is increased; each element of the circuit can work more stably under the condition of low voltage, so that the stability of the driving circuit can be improved by designing the negative voltage circuit 102; in addition, the negative voltage circuit 102 is designed to reduce the number of components in the backlight driving circuit by eliminating the need to use components with good specifications.
In the embodiment, in the electronic circuit, when the anode of the power supply is connected with the anode of the diode and the cathode of the power supply is connected with the cathode of the diode, the voltage generated by the circuit is a forward voltage; when the anode of the power supply is connected with the cathode of the diode and the cathode of the power supply is connected with the anode of the diode, the voltage generated by the circuit is reverse voltage.
The boosting circuit 101 is connected to the positive terminal of the LED lamp 105 to provide a positive voltage to the LED lamp 105, and the negative circuit 102 is connected to the negative terminal of the LED lamp 105 to provide a negative voltage to the LED lamp 105. The voltage of the second capacitor C2 is boosted in the voltage boosting circuit 101 through the first inductor L1 and the second inductor L2; after the first MOS transistor Q1 is turned on, the second capacitor C2 provides a forward voltage for the LED lamp 105; after the booster circuit 101 supplies voltage to the LED lamp 105, the single-string power supply circuit with high voltage has higher voltage, so that the negative voltage circuit 102 is loaded to reduce the voltage loaded to the LED lamp 105, thereby avoiding the operation of each element of the circuit under high voltage, reducing the increased loss of each part in the high voltage circuit, and further prolonging the service life of each part of the circuit; in addition, since each element of the circuit can operate more stably at a low voltage, the stability of the driving circuit can be improved by designing the negative voltage circuit 102.
For example, in the case of the one-way boost circuit 101, the withstand voltages of the elements such as the first MOS transistor Q1, the first capacitor C1, the second capacitor C2, the first inductor L1, and the second inductor L2 all reach 100V; if the booster circuit 101 and the negative voltage circuit 102 are simultaneously loaded on the circuit, the boosting can be known as 50V, the negative voltage only needs to be 50V, namely the withstand voltage of each element in the booster circuit 101 and the negative voltage circuit 102 can reach 50V; the stability and the life of the circuit component under the condition of lower voltage are better.
In an embodiment, the booster circuit 101 includes: a first inductor L1, a second inductor L2, a first diode D1, a first MOS transistor Q1, and a first resistor R; a first end of the first inductor L1 is connected to the positive power input end, a second end of the first inductor L1 is connected to an anode of the first diode D1 through the second inductor L2, and a cathode of the first diode D1 is connected to an anode of the LED lamp 105; the gate of the first MOS transistor Q1 is used for inputting a PWM control signal, the drain of the first MOS transistor Q1 is connected to the interconnection end of the first inductor L1 and the second inductor L2, and the source of the first MOS transistor Q1 is grounded via the first resistor R.
The gate of the first MOS transistor Q1 is connected to the first square wave driving circuit F1, and the first square wave driving circuit F1 inputs a PWM control signal to the first MOS transistor Q1 for controlling the conduction of the first MOS transistor Q1, and after the first MOS transistor Q1 is conducted, the second capacitor C2 provides a forward voltage to the LED lamp 105.
In an embodiment, the voltage boost circuit 101 further includes: the first input filter circuit is connected with the forward power supply end and is used for filtering the power supply input by the forward power supply end; and a first output filter circuit connected to a common terminal of the cathode of the first diode D1 and the anode of the LED lamp 105, for filtering the power outputted to the LED lamp 105.
In an embodiment, the first input filter circuit comprises a first capacitor C1, the first output filter circuit comprises a second capacitor C2; a first end of the first capacitor C1 is connected with the positive power input end, and a second end of the first capacitor C1 is grounded; a first terminal of the second capacitor C2 is connected to the cathode of the first diode D1, and a second terminal of the second capacitor C2 is grounded.
In one embodiment, the end of the second capacitor C2 near the first diode D1 is also connected to the anode of the LED lamp 105 and provides a forward voltage to the LED lamp 105. After the first MOS transistor Q1 is turned on, the voltage input to the power supply terminal is filtered by the first capacitor C1, and then a stable dc voltage is output, and then the voltage filtered by the first capacitor C1 is boosted by the first inductor L1 and the second inductor L2, and the filtered stable dc voltage is output to the LED lamp 105 through the second capacitor C2.
In an embodiment, the negative voltage circuit 102 includes: a third inductor L3, a second diode D2, and a second MOS transistor Q2; the grid electrode of the second MOS tube Q2 is used for inputting a PWM control signal, the drain electrode of the second MOS tube Q2 is connected with the negative power supply input end, the source electrode of the second MOS tube Q2 is connected with the cathode of the second diode D2, and the anode of the second diode D2 is connected with the cathode of the LED lamp 105; a first terminal of the third inductor L3 is connected to the interconnection terminal of the second MOS transistor Q2 and the second diode D2, and a second terminal of the third inductor L3 is grounded.
The second MOS transistor Q2 is connected to the second square wave driving circuit F2, and a PWM control signal is input to the second MOS transistor Q2 through the second square wave driving circuit F1 to control the conduction of the second MOS transistor Q2, and after the second MOS transistor Q2 is conducted, the fourth capacitor C4 provides negative voltage for the LED lamp 105.
In an embodiment, the negative voltage circuit 102 further includes: the second input filter circuit is connected with the negative power supply end and is used for filtering the power supply input by the negative power supply end; and the second output filter circuit is connected with the common end of the anode of the second diode D2 and the cathode of the LED lamp 105 and is used for filtering the power supply output to the LED lamp 105.
In an embodiment, the second input filter circuit comprises a third capacitor C3, and the second output filter circuit comprises a fourth capacitor C4; a first terminal of the third capacitor C3 is connected to the negative power input terminal, a second terminal of the third capacitor C3 is grounded, a first terminal of the fourth capacitor C4 is connected to the anode of the second diode D2, and a second terminal of the fourth capacitor C4 is grounded.
The third capacitor C3 is a second input filter circuit for filtering the voltage input from the negative power supply terminal, and the fourth capacitor C4 is a second output filter circuit for outputting the filtered voltage to the LED lamp 105; the voltage inputted from the negative power source terminal is filtered by the third capacitor C3 to output a stable dc voltage, and then the filtered stable dc voltage is outputted to the LED lamp 105 through the fourth capacitor C4.
As shown in fig. 3, a backlight device includes the LED lamp 105 driving circuit described above.
The backlight device comprises a forward power supply module; a negative power supply module; the booster circuit module 103 is connected in series between the forward power supply module and the LED lamp 105 to be driven; the negative voltage circuit module 104 is connected in series between the forward power supply module and the LED lamp 105 to be driven; a boost circuit module 103 for controlling the forward voltage provided by the forward power module to the LED lamp 105; a negative voltage circuit module 104 for controlling a negative voltage supplied from a negative power supply terminal to the LED lamp 105; the boosting circuit module 103 and the negative voltage circuit module 104 together modulate the magnitude of the driving voltage applied to the LED lamp 105.
In an embodiment, the boost circuit module 103 is connected to the positive terminal of the LED lamp 105 to provide a positive voltage to the LED lamp 105, and the negative circuit module 104 is connected to the negative terminal of the LED lamp 105 to provide a negative voltage to the LED lamp 105; the stability of the backlight driving circuit is improved by the common modulation of the boosting circuit module 103 and the negative voltage circuit module 104.
After the boost circuit module 103 provides voltage to the LED lamp 105, because the voltage of the single-string power supply circuit with high voltage is higher, the negative voltage circuit module 104 is loaded, so that the voltage loaded to the LED lamp 105 is reduced; the negative voltage provided by the negative voltage circuit module 104 prevents the circuit elements from continuously working under the condition of high voltage only, thereby preventing each element of the circuit from working under the condition of high voltage, reducing the increased consumption of each part in the high voltage circuit and further prolonging the service life of each part of the circuit; each element of the circuit can work more stably under the condition of low voltage, so that the stability of the driving circuit can be improved by designing the negative voltage circuit module 104; in addition, the negative voltage circuit module 104 is designed so that the parts in the backlight driving circuit do not need to use parts with better specifications, thereby reducing the cost.
As shown in fig. 4, a display system includes the backlight device and the display device;
the display device includes a display screen 106;
the backlight is built into the display system and is connected to the display screen 106.
In an embodiment, the boost circuit module 103 is connected to the positive terminal of the LED lamp 105 to provide a positive voltage to the LED lamp 105, and the negative circuit module 104 is connected to the negative terminal of the LED lamp 105 to provide a negative voltage to the LED lamp 105; the stability of the backlight driving circuit is improved by the common modulation of the boosting circuit module 103 and the negative voltage circuit module 104.
After the boost circuit module 103 provides voltage to the LED lamp 105, because the voltage of the single-string power supply circuit with high voltage is higher, the negative voltage circuit module 104 is loaded, so that the voltage loaded to the LED lamp 105 is reduced; the negative voltage provided by the negative voltage circuit module 104 prevents the circuit elements from continuously working under the condition of high voltage only, thereby preventing each element of the circuit from working under the condition of high voltage, reducing the increased consumption of each part in the high voltage circuit and further prolonging the service life of each part of the circuit; each element of the circuit can work more stably under the condition of low voltage, so that the stability of the driving circuit can be improved by designing the negative voltage circuit module 104; in addition, the negative voltage circuit module 104 is designed so that the parts in the backlight driving circuit do not need to use parts with better specifications, thereby reducing the cost.
In addition, the backlight device is matched with a display screen 106, and the LED lamp 105 is connected with the display screen 106 and provides a light source for the display screen 106; the backlight device is used as a light source to display backlight on the display screen 106, so as to achieve a screen backlight effect, such as a mobile phone, an electronic watch, and the like.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (10)
1. An LED lamp driver circuit, comprising:
a forward power supply terminal;
a negative power supply terminal;
the boosting circuit is connected between the forward power supply end and the LED lamp to be driven in series; and
the negative voltage circuit is connected between the positive power supply end and the LED lamp to be driven in series;
the boosting circuit is used for controlling the forward voltage provided by the forward power supply end to the LED lamp;
the negative voltage circuit is used for controlling a negative voltage provided by the negative power supply end to the LED lamp;
the boosting circuit and the negative voltage circuit jointly modulate the magnitude of the driving voltage loaded on the LED lamp.
2. The LED lamp driver circuit of claim 1, wherein the boost circuit comprises: the circuit comprises a first inductor, a second inductor, a first diode, a first MOS (metal oxide semiconductor) tube and a first resistor;
a first end of the first inductor is connected with the positive power supply input end, a second end of the first inductor is connected with an anode of the first diode through the second inductor, and a cathode of the first diode is connected with an anode of the LED lamp; the grid electrode of the first MOS tube is used for inputting a PWM control signal, the drain electrode of the first MOS tube is connected with the interconnection ends of the first inductor and the second inductor, and the source electrode of the first MOS tube is grounded through the first resistor.
3. The LED lamp driver circuit of claim 2, wherein the boost circuit further comprises:
the first input filter circuit is connected with the forward power supply end and is used for filtering the power supply input by the forward power supply end;
and the first output filter circuit is connected with the cathode of the first diode and the common end of the anode of the LED lamp and is used for filtering the power supply output to the LED lamp.
4. The LED lamp driver circuit of claim 3, wherein the first input filter circuit comprises a first capacitor and the first output filter circuit comprises a second capacitor;
the first end of the first capacitor is connected with the positive power supply input end, and the second end of the first capacitor is grounded;
the first end of the second capacitor is connected with the cathode of the first diode, and the second end of the second capacitor is grounded.
5. The LED lamp driving circuit of claim 4, wherein the end of the second capacitor near the first diode D1 is further connected to the positive terminal of the LED lamp and provides a forward voltage to the LED lamp.
6. The LED lamp driver circuit of claim 1, wherein the negative voltage circuit comprises: the third inductor, the second diode and the second MOS tube;
the grid electrode of the second MOS tube is used for inputting a PWM control signal, the drain electrode of the second MOS tube is connected with the negative power supply input end, the source electrode of the second MOS tube is connected with the cathode of the second diode, and the anode of the second diode is connected with the cathode of the LED lamp;
the first end of the third inductor is connected with the interconnection ends of the second MOS tube and the second diode, and the second end of the third inductor is grounded.
7. The LED lamp driving circuit according to claim 6, wherein the negative voltage circuit further comprises:
the second input filter circuit is connected with the negative power supply end and is used for filtering the power supply input by the negative power supply end;
and the second output filter circuit is connected with the anode of the second diode and the common end of the cathode of the LED lamp and is used for filtering the power supply output to the LED lamp.
8. The LED lamp driver circuit of claim 7, wherein the second input filter circuit comprises a third capacitor and the second output filter circuit comprises a fourth capacitor;
the first end of the third capacitor is connected with the negative power supply input end, and the second end of the third capacitor is grounded;
and the first end of the fourth capacitor is connected with the anode of the second diode, and the second end of the fourth capacitor is grounded.
9. A backlight device characterized by comprising the LED lamp driving circuit according to any one of claims 1 to 8.
10. A display system, comprising: a display device and the backlight device of claim 9;
the display device comprises a display screen;
the backlight device is arranged in the display system and is connected with the display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011435575.8A CN112599102A (en) | 2020-12-10 | 2020-12-10 | LED lamp driving circuit, backlight device and display system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011435575.8A CN112599102A (en) | 2020-12-10 | 2020-12-10 | LED lamp driving circuit, backlight device and display system |
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| Publication Number | Publication Date |
|---|---|
| CN112599102A true CN112599102A (en) | 2021-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011435575.8A Pending CN112599102A (en) | 2020-12-10 | 2020-12-10 | LED lamp driving circuit, backlight device and display system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290030A (en) * | 2011-07-01 | 2011-12-21 | 深圳市华星光电技术有限公司 | LED (Light-Emitting Diode) backlight driving circuit |
| CN102622986A (en) * | 2012-04-11 | 2012-08-01 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) backlight drive circuit, backlight module, and liquid crystal display device |
| CN203690895U (en) * | 2014-01-10 | 2014-07-02 | 深圳市垅运照明电器有限公司 | DC-DC boost short circuit protection circuit |
| CN204130143U (en) * | 2014-09-19 | 2015-01-28 | 深圳Tcl新技术有限公司 | LED backlight booster driving circuit and liquid crystal indicator |
| CN205451749U (en) * | 2016-03-15 | 2016-08-10 | 深圳Tcl数字技术有限公司 | Backlight drive circuit and television |
-
2020
- 2020-12-10 CN CN202011435575.8A patent/CN112599102A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290030A (en) * | 2011-07-01 | 2011-12-21 | 深圳市华星光电技术有限公司 | LED (Light-Emitting Diode) backlight driving circuit |
| CN102622986A (en) * | 2012-04-11 | 2012-08-01 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) backlight drive circuit, backlight module, and liquid crystal display device |
| CN203690895U (en) * | 2014-01-10 | 2014-07-02 | 深圳市垅运照明电器有限公司 | DC-DC boost short circuit protection circuit |
| CN204130143U (en) * | 2014-09-19 | 2015-01-28 | 深圳Tcl新技术有限公司 | LED backlight booster driving circuit and liquid crystal indicator |
| CN205451749U (en) * | 2016-03-15 | 2016-08-10 | 深圳Tcl数字技术有限公司 | Backlight drive circuit and television |
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Application publication date: 20210402 |
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| RJ01 | Rejection of invention patent application after publication |