CN111787657A - Backlight protection circuit, device and automobile - Google Patents
Backlight protection circuit, device and automobile Download PDFInfo
- Publication number
- CN111787657A CN111787657A CN202010781880.6A CN202010781880A CN111787657A CN 111787657 A CN111787657 A CN 111787657A CN 202010781880 A CN202010781880 A CN 202010781880A CN 111787657 A CN111787657 A CN 111787657A
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- circuit
- backlight
- power supply
- signal
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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]
- H05B45/10—Controlling the intensity of the light
-
- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention relates to the technical field of electronics, and discloses a backlight protection circuit, a backlight protection device and an automobile. According to the technical scheme, when a power supply signal of a power supply circuit is received through a backlight circuit, the backlight circuit is communicated with a control circuit according to the power supply signal; when the control circuit receives the brightness adjusting signal, the control circuit outputs a pulse signal to the backlight circuit according to the brightness adjusting signal; when the backlight circuit receives the pulse signal output by the control circuit, the output current is output to the ground terminal, the power supply circuit, the control circuit and the backlight circuit are communicated, and the output circuit is output to the ground terminal through the backlight circuit, so that the common ground connection of the backlight circuit and the circuit board is realized, the ablation of small lamps caused by touching other power lines in the test process of the vehicle-mounted system can be avoided, the fire phenomenon of the vehicle-mounted entertainment system is prevented, and the safety of the vehicle-mounted entertainment system is improved.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a backlight protection circuit, a backlight protection device and an automobile.
Background
In the testing process of the vehicle-mounted entertainment system, the situation that a backlight lamp of the vehicle-mounted entertainment system is ablated is found, meanwhile, along with pungent smoke smell, the vehicle-mounted entertainment system has the risk of catching fire, and aiming at the situation that the whole vehicle is prevented from being burnt, the circuit of the vehicle-mounted entertainment system is upgraded.
The technical scheme adopted at present is to independently ground the small backlight lamp, but if the small backlight lamp touches other power lines in the test process, the small backlight lamp can still be ablated.
Disclosure of Invention
The invention mainly aims to provide a backlight protection circuit, aiming at grounding a small backlight lamp and a circuit board together and improving the safety of a vehicle-mounted entertainment system.
In order to achieve the above object, the backlight protection circuit of the present invention comprises a power circuit, a backlight circuit and a control circuit;
the backlight circuit is used for being communicated with the control circuit according to the power supply signal when receiving the power supply signal of the power supply circuit;
the control circuit is used for outputting a pulse signal to the backlight circuit according to the brightness adjusting signal when receiving the brightness adjusting signal;
and the backlight circuit is used for outputting the output current to a grounding end when receiving the pulse signal output by the control circuit.
Optionally, the backlight protection circuit further comprises a high frequency suppression circuit, the high frequency suppression circuit being located between the power supply circuit and the backlight circuit;
the high-frequency suppression circuit is used for performing high-frequency suppression on the power supply signal output by the power supply circuit to obtain a suppressed power supply signal and outputting the suppressed power supply signal to the backlight circuit.
Optionally, the high frequency suppression circuit is a magnetic bead.
Optionally, the power circuit is a dc battery.
Optionally, the backlight circuit is a light emitting diode;
the anode of the light-emitting diode is connected with the anode of the direct current storage battery, the cathode of the light-emitting diode is connected with the grounding terminal, and the cathode of the direct current storage battery is connected with the grounding terminal.
Optionally, the backlight protection circuit further includes a filter circuit, and the filter circuit is located between the dc battery and the light emitting diode;
the input end of the filter circuit is connected with the anode of the direct current storage battery, and the output end of the filter circuit is connected with the anode of the light emitting diode.
The filter circuit is configured to filter a power supply signal output by the dc storage battery to obtain a filtered power supply signal, and output the filtered power supply signal to an anode of the light emitting diode.
Optionally, the filter circuit comprises a resistor and a capacitor;
the input end of the resistor is connected with the anode of the direct current storage battery, and the output end of the resistor is connected with the anode of the light emitting diode;
the input end of the capacitor is connected with the anode of the direct current storage battery, and the output end of the capacitor is connected with the anode of the light emitting diode.
Optionally, the control circuit is an STM32F334x8 control chip.
The invention also provides a backlight protection device which comprises the backlight protection circuit.
The invention also provides an automobile which comprises the backlight lamp protection device.
According to the technical scheme, when a power supply signal of a power supply circuit is received through a backlight circuit, the backlight circuit is communicated with a control circuit according to the power supply signal; when the control circuit receives the brightness adjusting signal, the control circuit outputs a pulse signal to the backlight circuit according to the brightness adjusting signal; when the backlight circuit receives the pulse signal output by the control circuit, the output current is output to the ground terminal, the power supply circuit, the control circuit and the backlight circuit are communicated, and the output circuit is output to the ground terminal through the backlight circuit, so that the common connection between the backlight circuit and the circuit board and the ground terminal is realized, the ablation of small lamps caused by touching other power lines in the test process or the driving process of the vehicle-mounted system can be avoided, the fire phenomenon of the vehicle-mounted entertainment system is prevented, and the safety of the vehicle-mounted entertainment system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of a backlight protection circuit according to an embodiment of the present invention;
FIG. 2 is a functional block diagram of another embodiment of a backlight protection circuit of the present invention;
fig. 3 is a circuit configuration diagram of a backlight protection circuit according to still another embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | |
500 | |
| 200 | Control circuit | L | |
| 300 | Backlight circuit | R | Resistance (RC) |
| 400 | High frequency suppression circuit | C | Capacitor with a capacitor element |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
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.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should be considered to be absent and not within the protection scope of the present invention.
The invention provides a backlight protection circuit.
Referring to fig. 1, in the embodiment of the present invention, the backlight protection circuit includes a power supply circuit 100, a backlight circuit 300, and a control circuit 200.
In this embodiment, the power circuit 100 supplies power to the backlight circuit 300, in this embodiment, one end of the power circuit 100 is connected to one end of the backlight circuit 300, the other end of the power circuit 100 is connected to the ground, and the other end of the backlight circuit 300 is connected to the ground.
In this embodiment, the power circuit 100 is a dc battery, the backlight circuit 300 is a light emitting diode, and specifically, the connection of one end of the power circuit 100 to one end of the backlight circuit 300, the connection of the other end of the power circuit 100 to a ground terminal, and the connection of the other end of the backlight circuit 300 to the ground terminal includes: the positive pole of the direct current storage battery is connected with the positive pole of the light-emitting diode, the negative pole of the direct current storage battery is connected with the stage, and the negative pole of the light-emitting diode is connected with the grounding end.
In a specific implementation, the power supply circuit 100 outputs a power supply signal to the backlight circuit 300, the power supply signal includes a voltage signal and a current signal, the power supply signal flows through the control circuit 200 to the backlight circuit 300, and the backlight circuit 300 is connected to the control circuit 200 according to the power supply signal when receiving the power supply signal output by the power supply circuit 100.
In a specific implementation, the control circuit 200 is located between the power circuit 100 and the backlight circuit 300, and the control circuit 200 outputs a pulse signal to the backlight circuit 300 after communicating with the backlight circuit 300, in this embodiment, the backlight circuit 300 is a light emitting diode, and the light emitting diode also has a unidirectional conductivity of a common diode, and is a light emitting device, when a forward voltage is applied to the light emitting diode, the light emitting diode generates a self-emitted fluorescence, and the control circuit 200 can adjust the light emitting brightness of the light emitting diode by outputting the pulse signal to the backlight circuit 300.
In a specific implementation, when receiving the brightness adjustment signal, the control circuit 200 outputs a pulse signal to the backlight circuit 300 according to the brightness adjustment signal, where the pulse signal is a discrete signal, and compared with a common analog signal (e.g., a sine wave), the pulse signal is characterized in that the waveforms are discontinuous on the Y axis (there is a distinct interval between the waveforms) but have a certain periodicity. The most common pulse wave is a rectangular wave (i.e., a square wave). The pulse signal may be used to represent information, may also be used as a carrier, such as Pulse Code Modulation (PCM) in pulse modulation, Pulse Width Modulation (PWM), etc., and may also be used as a clock signal for various digital circuits and high performance chips, and the control circuit 200 adjusts the voltage amplitude or the current amplitude of the pulse signal according to the brightness adjusting signal, thereby implementing brightness adjustment of the light emitting diode.
It should be noted that, in this embodiment, the control circuit 200 is an STM32F334X8 control chip, and the control circuit 200 is located between the power supply circuit 100 and the backlight circuit 300, specifically: the input end of the STM32F334X8 control chip is connected with the anode of the direct current storage battery, and the output end of the STM32F334X8 control chip is respectively connected with the anode of the light-emitting diode.
In a specific implementation, after the backlight circuit 300 is connected to the control circuit 200, the backlight circuit 300 receives the pulse signal output by the control circuit 200, and the backlight circuit 300 is connected to the ground terminal, and then outputs an output current to the ground terminal according to the received pulse signal.
In the present embodiment, when receiving the power signal of the power circuit 100, the backlight circuit 300 communicates with the control circuit 200 according to the power signal; when receiving the brightness adjusting signal, the control circuit 200 outputs a pulse signal to the backlight circuit 300 according to the brightness adjusting signal; when receiving the pulse signal output by the control circuit 200, the backlight circuit 300 outputs the output current to the ground terminal, and the power supply circuit 100, the control circuit 200 and the backlight circuit 300 are communicated, and the output circuit is output to the ground terminal through the backlight circuit 300, so that the connection between the backlight circuit 300 and the circuit board and the ground terminal is realized, the situation that the small lamp is ablated due to the fact that other power lines are touched in the test process or the driving process of the vehicle-mounted system can be avoided, the fire phenomenon of the vehicle-mounted entertainment system is prevented, and the safety of the vehicle-mounted entertainment system is improved.
Further, referring to fig. 2, in the present embodiment, the backlight circuit 300 further includes: a high frequency suppression circuit 400, wherein the high frequency suppression circuit 400 is located between the control circuit 200 and the power supply circuit 100, an input terminal of the high frequency suppression circuit 400 is connected to one terminal of the power supply circuit 100, and an output terminal of the high frequency suppression circuit 400 is connected to one terminal of the backlight circuit 300.
In a specific implementation, the high frequency suppression circuit 400 performs high frequency suppression on the power supply signal output by the power supply circuit 100 to obtain a suppressed power supply signal, and outputs the suppressed power supply signal to the backlight circuit 300.
In this embodiment, the example where the high frequency suppression circuit 400 is a magnetic bead L, the input terminal of the high frequency suppression circuit 400 is connected to one terminal of the power supply circuit 100, and the connection between the output terminal of the high frequency suppression circuit 400 and one terminal of the backlight circuit 300 specifically includes: the input end of the magnetic bead L is connected with the anode of the direct-current storage battery, and the output end of the magnetic bead L is connected with the anode of the light-emitting diode.
In this embodiment, the magnetic bead L is dedicated to suppressing high-frequency noise and spike interference on the signal line and the power line, and also has the ability to absorb electrostatic pulses. The magnetic beads are used for absorbing ultrahigh frequency signals, like some RF circuits, PLL, oscillating circuits and circuits containing ultrahigh frequency memories (DDR SDRAM, RAMBUS and the like), the magnetic beads are required to be added to a power supply input part, the inductor is an energy storage element and is used for LC oscillating circuits, medium and low frequency filter circuits and the like, and the application frequency range of the inductor rarely exceeds 50 MHZ. The magnetic beads have very high resistivity and permeability, which are equivalent to a resistor and an inductor connected in series, but the resistance value and the inductance value change along with the frequency.
Further, in this embodiment, the backlight circuit 300 further includes: a filter circuit 500, wherein the filter circuit 500 is located between the power supply circuit 100 and the backlight circuit 300, one end of the filter circuit 500 is connected to one end of the power supply circuit 100, and one end of the filter circuit 500 is connected to one end of the backlight circuit 300.
Specifically, the filter circuit 500 is located between the dc battery and the light emitting diode, wherein one end of the filter circuit 500 is connected to one end of the power circuit 100, and the connection between one end of the filter circuit 500 and one end of the backlight circuit 300 specifically includes: the input end of the filter circuit 500 is connected with the anode of the dc storage battery, and the output end of the filter circuit 500 is connected with the anode of the light emitting diode. The power signal includes a power signal, and the filter circuit 500 filters the power signal output by the dc battery to obtain a filtered power signal, and then outputs the filtered power signal to the anode of the light emitting diode.
It should be noted that the filter circuit 500 is used to effectively filter a frequency point of a specific frequency in the circuit or frequencies other than the frequency point, so as to obtain a power signal of the specific frequency or eliminate the power signal of the specific frequency. By using the characteristic of the power supply filter, a square wave group or composite noise wave passing through the power supply filter can be changed into a sine wave with a specific frequency.
In this example, the filter circuit 500 includes a resistor R and a capacitor C, and since the inductive element generates an induced electromotive force to block the sudden change of current at the two ends of the element when the circuit is switched on and off, the electromotive force is very large and is applied to the switch, and since the two poles of the switch are very close to each other when the switch is switched on or switched off, the switch forms an air capacitor structure at this time, the induced electromotive force charges the switched air capacitor and breaks down the capacitor very quickly, and a spark is generated when the capacitor is broken down, so that a spark is seen when the switch is switched on or switched off, and the spark generated by the circuit switch can cause a hidden danger to the personal safety and burn the contact part of the switch, which affects the service life of the switch. In order to protect the switch from being ignited, a resistor and a capacitor are connected in parallel on the circuit, the induced electromotive force generated by the switch during on-off flows to the resistor and the capacitor in the switch parallel circuit, the capacitor on the switch parallel circuit is large in capacity generally, and absorbs a large amount of electric energy of the induced electromotive force, so that the induced electromotive force applied to the switch is greatly reduced, and the spark is avoided.
The input end of the filter circuit 500 is connected to the positive electrode of the dc battery, and the output end of the filter circuit 500 is connected to the anode of the light emitting diode, specifically: the input end of the resistor R is connected with the anode of the direct-current storage battery, the output end of the resistor R is connected with the anode of the light-emitting diode, the input end of the capacitor C is connected with the anode of the direct-current storage battery, and the output end of the capacitor C is connected with the anode of the light-emitting diode.
In this embodiment, the high frequency suppression circuit 400 and the filter circuit 500 are disposed between the power circuit 100 and the backlight circuit 300, the high frequency suppression circuit 400 performs high frequency suppression on the power signal output by the power circuit 100 to obtain a suppressed power signal, and outputs the suppressed power signal to the backlight circuit 300, and the filter capacitor formed by the resistor R and the capacitor C filters the power signal output by the power circuit 100 to obtain a filtered power signal, and outputs the filtered power signal to the backlight circuit 300, so that the backlight circuit 300 is more stable and safer.
The present invention further provides a backlight protection device, which includes the backlight protection circuit as described above, and the specific structure of the backlight protection circuit refers to the above embodiments, and since the backlight protection device adopts all technical solutions of all the above embodiments, the backlight protection device at least has all beneficial effects brought by the technical solutions of the above embodiments, and details are not repeated herein.
In addition, the invention further provides an automobile which comprises the backlight protection device, and it is easy to understand that since the automobile adopts all the technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and detailed description is omitted.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.
It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.
Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A backlight protection circuit is characterized by comprising a power supply circuit, a backlight circuit and a control circuit;
the backlight circuit is used for being communicated with the control circuit according to the power supply signal when receiving the power supply signal of the power supply circuit;
the control circuit is used for outputting a pulse signal to the backlight circuit according to the brightness adjusting signal when receiving the brightness adjusting signal;
and the backlight circuit is used for outputting the output current to a grounding end when receiving the pulse signal output by the control circuit.
2. The backlight protection circuit of claim 1, wherein the backlight protection circuit further comprises a high frequency suppression circuit, the high frequency suppression circuit being located between the power supply circuit and the backlight circuit;
the high-frequency suppression circuit is used for performing high-frequency suppression on the power supply signal output by the power supply circuit to obtain a suppressed power supply signal and outputting the suppressed power supply signal to the backlight circuit.
3. The backlight protection circuit of claim 2, wherein the high frequency suppression circuit is a magnetic bead.
4. A backlight protection circuit according to any one of claims 1 to 3, wherein the power supply circuit is a direct current storage battery.
5. The backlight protection circuit of claim 4, wherein the backlight circuit is a light emitting diode;
the anode of the light-emitting diode is connected with the anode of the direct current storage battery, the cathode of the light-emitting diode is connected with the grounding terminal, and the cathode of the direct current storage battery is connected with the grounding terminal.
6. The backlight protection circuit of claim 5, wherein the backlight protection circuit further comprises a filter circuit, the filter circuit being located between the direct current storage battery and the light emitting diode;
the input end of the filter circuit is connected with the anode of the direct current storage battery, and the output end of the filter circuit is connected with the anode of the light emitting diode.
The filter circuit is configured to filter a power supply signal output by the dc storage battery to obtain a filtered power supply signal, and output the filtered power supply signal to an anode of the light emitting diode.
7. The backlight protection circuit of claim 6, wherein the filter circuit comprises a resistor and a capacitor;
the input end of the resistor is connected with the anode of the direct current storage battery, and the output end of the resistor is connected with the anode of the light emitting diode;
the input end of the capacitor is connected with the anode of the direct current storage battery, and the output end of the capacitor is connected with the anode of the light emitting diode.
8. A backlight protection circuit according to any of claims 1 to 3, wherein the control circuit is an STM32F334X8 control chip.
9. A backlight protection device, characterized in that the backlight protection device comprises a backlight protection circuit according to any one of claims 1 to 8.
10. An automobile, characterized in that the automobile comprises an automobile body and the backlight protection device according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010781880.6A CN111787657A (en) | 2020-08-05 | 2020-08-05 | Backlight protection circuit, device and automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010781880.6A CN111787657A (en) | 2020-08-05 | 2020-08-05 | Backlight protection circuit, device and automobile |
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| Publication Number | Publication Date |
|---|---|
| CN111787657A true CN111787657A (en) | 2020-10-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010781880.6A Pending CN111787657A (en) | 2020-08-05 | 2020-08-05 | Backlight protection circuit, device and automobile |
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| CN (1) | CN111787657A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100265271A1 (en) * | 2009-04-16 | 2010-10-21 | Chunghwa Picture Tubes, Ltd. | Driving circuit of backlight module |
| CN201804534U (en) * | 2010-09-04 | 2011-04-20 | 青岛海信电器股份有限公司 | Light-emitting diode (LED) drive circuit and television having same |
| US9288854B2 (en) * | 2012-11-29 | 2016-03-15 | Samsung Display Co., Ltd. | Backlight unit and display device having the same |
| CN205160862U (en) * | 2015-11-03 | 2016-04-13 | 佛山市集星光电科技有限公司 | LED shot -light that seven coloured silks discolour |
| CN106413207A (en) * | 2016-12-12 | 2017-02-15 | 深圳市蓝色风科技有限公司 | Backlight button, capable of automatically adjusting brightness according to ambient light intensity change, of switch/socket panel |
| CN107318194A (en) * | 2017-07-17 | 2017-11-03 | 南京中电熊猫照明有限公司 | A kind of backlight module lighting system |
| CN111081192A (en) * | 2019-12-05 | 2020-04-28 | 芜湖宏景电子股份有限公司 | Two-stage brightness control circuit for backlight lamp of vehicle-mounted multimedia display screen |
-
2020
- 2020-08-05 CN CN202010781880.6A patent/CN111787657A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100265271A1 (en) * | 2009-04-16 | 2010-10-21 | Chunghwa Picture Tubes, Ltd. | Driving circuit of backlight module |
| CN201804534U (en) * | 2010-09-04 | 2011-04-20 | 青岛海信电器股份有限公司 | Light-emitting diode (LED) drive circuit and television having same |
| US9288854B2 (en) * | 2012-11-29 | 2016-03-15 | Samsung Display Co., Ltd. | Backlight unit and display device having the same |
| CN205160862U (en) * | 2015-11-03 | 2016-04-13 | 佛山市集星光电科技有限公司 | LED shot -light that seven coloured silks discolour |
| CN106413207A (en) * | 2016-12-12 | 2017-02-15 | 深圳市蓝色风科技有限公司 | Backlight button, capable of automatically adjusting brightness according to ambient light intensity change, of switch/socket panel |
| CN107318194A (en) * | 2017-07-17 | 2017-11-03 | 南京中电熊猫照明有限公司 | A kind of backlight module lighting system |
| CN111081192A (en) * | 2019-12-05 | 2020-04-28 | 芜湖宏景电子股份有限公司 | Two-stage brightness control circuit for backlight lamp of vehicle-mounted multimedia display screen |
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Application publication date: 20201016 |