CN107481679B - LED double-backlight control circuit and double-backlight LED device - Google Patents
LED double-backlight control circuit and double-backlight LED device Download PDFInfo
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- CN107481679B CN107481679B CN201710867241.XA CN201710867241A CN107481679B CN 107481679 B CN107481679 B CN 107481679B CN 201710867241 A CN201710867241 A CN 201710867241A CN 107481679 B CN107481679 B CN 107481679B
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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]
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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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- 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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention is suitable for the field of LED display, and provides an LED double-backlight control circuit and a double-backlight LED device, wherein the circuit comprises: the system comprises a backlight control unit, a multiplexing function superposition unit and a mode selection unit; the backlight control unit generates a first backlight driving signal and a second backlight driving signal according to the backlight control signal and the PWM signal to drive the backlight; the mode selection unit controls the multiplexing function superposition unit to be switched on or off according to the selection control signal, and when the multiplexing function superposition unit is switched off, the backlight control unit controls backlight driving in a PWM dimming mode; when the backlight control unit and the multiplexing function superposition unit are conducted, the backlight driving is controlled in a DC dimming mode. The invention controls whether the multiplexing function superposition unit executes the circuit function or not through the mode selection unit, thereby compatibly realizing the control driving of two dimming modes, simplifying the circuit structure and the interface, reducing the circuit volume and improving the compatibility of the display main board.
Description
Technical Field
The invention belongs to the field of LED display, and particularly relates to an LED double-backlight control circuit and a double-backlight LED device.
Background
Because of the inherent shortages of narrow color gamut, low energy utilization rate, higher power consumption, short service life and the like of CCFL (Cold Cathode Fluorescent Lamps, cold cathode fluorescent lamp) backlight technology and products on the traditional LCD display equipment, the LED backlight technology products gradually enter the selection range of people.
The current LED backlight technology is divided into a PWM (Pulse Width Modulation) dimming mode and a DC (direct current) dimming mode to drive a backlight source, however, both dimming modes are implemented by using independent control circuits, and compatibility of the two dimming modes cannot be achieved, so that a display main board is large in size and poor in compatibility.
Disclosure of Invention
The embodiment of the invention aims to provide an LED double-backlight control circuit, which aims to solve the problems that the prior LED backlight has large size and poor compatibility caused by the fact that a plurality of adjustment modes of the LED backlight are realized by independent control circuits.
The embodiment of the invention is realized in such a way that an LED double-backlight control circuit is connected with an LED backlight driving unit, and the circuit comprises:
the system comprises a backlight control unit, a multiplexing function superposition unit and a mode selection unit;
the first input end of the backlight control unit receives a backlight control signal, the second input end of the backlight control unit receives a PWM signal, the first output end and the second output end of the backlight control unit are respectively connected with two driving ends of the LED backlight driving chip, the output end of the backlight control unit is also connected with the superposition end of the multiplexing function superposition unit, the input end of the mode selection unit receives a selection control signal, and the output end of the mode selection unit is connected with the control end of the multiplexing function superposition unit;
the backlight control unit generates a first backlight driving signal and a second backlight driving signal according to the backlight control signal and the PWM signal to drive the LED backlight driving chip; the mode selection unit controls the multiplexing function superposition unit to be switched on or off according to a selection control signal, and when the multiplexing function superposition unit is switched off, the backlight control unit controls the LED backlight driving chip to carry out backlight driving in a PWM dimming mode; when the multiplexing function superposition unit is conducted, the backlight control unit and the multiplexing function superposition unit control the LED backlight driving chip to perform backlight driving in a DC dimming mode.
Another object of an embodiment of the present invention is to provide a dual backlight LED device including the above LED dual backlight control circuit.
The embodiment of the invention controls whether the multiplexing function superposition unit executes the circuit function only through the mode selection unit, thereby compatibly realizing the control driving of two dimming modes, simplifying the circuit structure and the interface, reducing the circuit volume and improving the compatibility of the display main board.
Drawings
Fig. 1 is a block diagram of an LED dual backlight control circuit according to an embodiment of the present invention;
fig. 2 is an exemplary circuit diagram of an LED dual backlight control circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The embodiment of the invention controls whether the multiplexing function superposition unit executes the circuit function only through the mode selection unit, thereby compatibly realizing the control driving of two dimming modes, simplifying the circuit structure and the interface, reducing the circuit volume and improving the compatibility of the display main board.
Fig. 1 shows the structure of an LED dual backlight control circuit according to an embodiment of the present invention, and for convenience of explanation, only the portions relevant to the present invention are shown.
As an embodiment of the present invention, the LED dual backlight control circuit may be applied to any dual backlight LED device, and the LED dual backlight control circuit is connected to an LED backlight driving unit, and includes:
a backlight control unit 11, a multiplexing function superimposing unit 12, a mode selecting unit 13;
a first input end of the backlight control unit 11 receives a backlight control signal BL-EN, a second input end of the backlight control unit 11 receives a PWM (Pulse Width Modulation ) signal, a first output end and a second output end of the backlight control unit 11 are respectively connected with two driving ends of an LED backlight driving chip, an output end of the backlight control unit 11 is also connected with a superposition end of the multiplexing function superposition unit 12, an input end of the mode selection unit 13 receives a selection control signal ADJ_OPTION, and an output end of the mode selection unit 13 is connected with a control end of the multiplexing function superposition unit 12;
the backlight control unit 11 generates a first backlight driving signal bl_en and a second backlight driving signal bl_adj to drive the LED backlight driving chip according to the backlight control signal bl_en and the PWM signal; the mode selection unit 13 controls the multiplexing function superimposing unit 12 to be turned on or off according to the selection control signal adj_option, and when the multiplexing function superimposing unit 12 is turned off, the backlight control unit 11 controls the LED backlight driving chip to perform backlight driving in a PWM dimming mode; when the multiplexing-function superimposing unit 12 is turned on, the backlight control unit 11 and the multiplexing-function superimposing unit 12 control the LED backlight driving chip to perform backlight driving in a DC dimming manner.
In the embodiment of the present invention, when the selection control signal adj_option is at a high level, the mode selection unit 13 connects the control end of the multiplexing function superimposing unit 12 to the ground potential, the multiplexing function superimposing unit 12 is turned on, and when the backlight control signal BL-EN of the backlight control unit 11 is a low level signal Lo, the backlight control unit 11 and the multiplexing function superimposing unit 12 together realize DC dimming mode control backlight driving;
when the selection control signal adj_option is at low level, the output terminal of the mode selection unit 13 is at high level, the multiplexing function superimposing unit 12 cannot be turned on, and the circuit function cannot be executed, which corresponds to turning off the multiplexing function superimposing unit 12, and only when the backlight control signal BL-EN of the backlight control unit 11 is at low level signal Lo, the backlight control unit 11 executes PWM dimming control to control the backlight driving.
When the backlight control signal BL-EN is the high level signal Hi, the backlight control unit 11 does not perform the dimming control driving operation.
The embodiment of the invention controls whether the multiplexing function superposition unit executes the circuit function only through the mode selection unit, thereby compatibly realizing the control driving of two dimming modes, simplifying the circuit structure and the interface, reducing the circuit volume and improving the compatibility of the display main board.
Fig. 2 shows an exemplary circuit structure of an LED dual backlight control circuit provided in an embodiment of the present invention, and only a portion relevant to the present invention is shown for convenience of explanation.
In the embodiment of the invention, the LED backlight driving unit is specifically realized by adopting an LED backlight driving chip CN1, 1-5 pins of the LED backlight driving chip CN1 are connected with a Panel Power supply Panel_Power,6-10 pins and 111 and 112 pins are grounded, and 11 and 12 pins are used as two driving ends to be connected with two output ends of a backlight control unit 11.
As an embodiment of the present invention, the backlight control unit 11 includes:
resistor R1, resistor R2, resistor R3, resistor R5, resistor R6, resistor R7 and second switching tube Q2;
one end of a resistor R1 is connected with one end of a resistor R2 for a first input end of the backlight control unit 11, the other end of the resistor R2 is connected with +5V system power supply voltage, the other end of the resistor R1 is connected with a control end of a second switching tube Q2, a current output end of the second switching tube Q2 is grounded, the current input end of the second switching tube Q2 is simultaneously connected with one end of a resistor R3 and one end of a resistor R6, the other end of the resistor R3 is connected with +5V system power supply voltage, the other end of the resistor R6 is a first output end of the backlight control unit 11, one end of the resistor R5 is a second input end of the backlight control unit 11 and one end of a resistor R7, the other end of the resistor R7 is connected with +5V system power supply voltage, and the other end of the resistor R5 is a second output end of the backlight control unit 11.
Preferably, the second switching transistor Q2 is an NPN-type transistor, a collector of the NPN-type transistor is a current input end of the second switching transistor Q2, an emitter of the NPN-type transistor is a current output end of the second switching transistor Q2, and a base of the NPN-type transistor is a control end of the second switching transistor Q2.
As an embodiment of the present invention, the multiplexing function superimposing unit 12 includes:
a capacitor C1 and a capacitor C2;
the capacitor C1 is connected in parallel with the capacitor, one common end of the parallel connection is the superposition end of the multiplexing function superposition unit 12, and the other common end of the parallel connection is the control end of the multiplexing function superposition unit 12.
As an embodiment of the present invention, the mode selection unit 13 includes:
a resistor R4 and a first switching tube Q1;
one end of the resistor R4 is an input end of the mode selection unit 13 and is connected with a control end of the first switching tube Q1, the other end of the resistor R4 is connected with +5V system power supply voltage, a current input end of the first switching tube Q1 is an output end of the mode selection unit 13, and a current output end of the first switching tube Q1 is grounded.
Preferably, the first switching tube Q1 is an N-type MOS tube, the drain electrode of the N-type MOS tube is the current input end of the first switching tube Q1, the source electrode of the N-type MOS tube is the current output end of the first switching tube Q1, and the gate electrode of the N-type MOS tube is the control end of the first switching tube Q1.
In the embodiment of the present invention, when the selection control signal adj_option is at a high level, the first switching tube Q1 is turned on, the other ends of the capacitor C1 and the capacitor C2 are pulled down to the ground potential, the capacitor C1 and the capacitor C2 perform energy storage control, and when the backlight control signal BL-EN of the backlight control unit 11 is a low level signal Lo, the second switching tube Q2 is turned on, the backlight control unit 11 and the multiplexing function superimposing unit 12 together realize a DC dimming mode to control backlight driving, the DC dimming mode realizes analog dimming by the magnitude of the direct current level, and the magnitude of brightness is proportionally changed by changing the voltage value of the control signal;
when the selection control signal adj_option is at a low level, the first switching tube Q1 is turned off, the capacitor C1 and the capacitor C2 do not function, the multiplexing function superimposing unit 12 does not perform a circuit function together with the backlight control unit 11, the second switching tube Q2 is turned on only when the backlight control signal BL-EN of the backlight control unit 11 is a low level signal Lo, the backlight control unit 11 performs PWM dimming mode to control backlight driving, and the PWM dimming mode realizes digital dimming by setting the switching period and the duty ratio of the control signal, thereby completing accurate dimming of luminance from 0 to 100%.
When the backlight control signal BL-EN is the high level signal Hi, the second switching transistor Q2 is turned off, and the backlight control unit 11 does not perform the dimming control driving operation.
The embodiment of the invention controls whether the multiplexing function superposition unit executes the circuit function only through the mode selection unit, thereby compatibly realizing the control driving of two dimming modes, simplifying the circuit structure and the interface, reducing the circuit volume and improving the compatibility of the display main board.
Another object of an embodiment of the present invention is to provide a dual backlight LED device including the above LED dual backlight control circuit.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. An LED dual backlight control circuit connected to an LED backlight driving unit, the circuit comprising:
the system comprises a backlight control unit, a multiplexing function superposition unit and a mode selection unit;
the first input end of the backlight control unit receives a backlight control signal, the second input end of the backlight control unit receives a PWM signal, the first output end and the second output end of the backlight control unit are respectively connected with two driving ends of the LED backlight driving chip, the output end of the backlight control unit is also connected with the superposition end of the multiplexing function superposition unit, the input end of the mode selection unit receives a selection control signal, and the output end of the mode selection unit is connected with the control end of the multiplexing function superposition unit;
the backlight control unit generates a first backlight driving signal and a second backlight driving signal according to the backlight control signal and the PWM signal to drive the LED backlight driving chip; the mode selection unit controls the multiplexing function superposition unit to be switched on or off according to a selection control signal, and when the multiplexing function superposition unit is switched off, the backlight control unit controls the LED backlight driving chip to carry out backlight driving in a PWM dimming mode; when the multiplexing function superposition unit is conducted, the backlight control unit and the multiplexing function superposition unit control the LED backlight driving chip to perform backlight driving in a DC dimming mode;
when the selection control signal is high level, the mode selection unit controls the multiplexing function superposition unit to be conducted, and when the backlight control signal of the backlight control unit is low level signal, the backlight control unit and the multiplexing function superposition unit control the LED backlight driving chip to perform backlight driving in a DC dimming mode;
when the selection control signal is a low level, the mode selection unit controls the multiplexing function superposition unit to be turned off, and when the backlight control signal of the backlight control unit is a low level signal, the backlight control unit controls the LED backlight driving chip to perform backlight driving in a PWM dimming mode;
when the backlight control signal is a high level signal, the backlight control unit does not perform dimming control driving operation.
2. The circuit of claim 1, wherein the backlight control unit comprises:
the resistor R1, the resistor R2, the resistor R3, the resistor R5, the resistor R6, the resistor R7 and the second switching tube;
one end of the resistor R1 is a first input end of the backlight control unit and one end of the resistor R2 is connected, the other end of the resistor R2 is connected with a system power supply voltage, the other end of the resistor R1 is connected with a control end of the second switching tube, a current output end of the second switching tube is grounded, the current input end of the second switching tube is simultaneously connected with one end of the resistor R3 and one end of the resistor R6, the other end of the resistor R3 is connected with the system power supply voltage, the other end of the resistor R6 is a first output end of the backlight control unit, one end of the resistor R5 is a second input end of the backlight control unit and one end of the resistor R7 is connected, the other end of the resistor R7 is connected with the system power supply voltage, and the other end of the resistor R5 is a second output end of the backlight control unit.
3. The circuit of claim 2, wherein the second switching transistor is an NPN transistor, a collector of the NPN transistor is a current input terminal of the second switching transistor, an emitter of the NPN transistor is a current output terminal of the second switching transistor, and a base of the NPN transistor is a control terminal of the second switching transistor.
4. The circuit of claim 1, wherein the multiplexing functional superposition unit comprises:
a capacitor C1 and a capacitor C2;
the capacitor C1 and the capacitor are connected in parallel, and a common end connected in parallel is a superposition end of the multiplexing function superposition unit; the other common end connected in parallel is the control end of the multiplexing function superposition unit.
5. The circuit of claim 1, wherein the mode selection unit comprises:
a resistor R4 and a first switching tube;
one end of the resistor R4 is the input end of the mode selection unit and is connected with the control end of the first switching tube, the other end of the resistor R4 is connected with the system power supply voltage, the current input end of the first switching tube is the output end of the mode selection unit, and the current output end of the first switching tube is grounded.
6. The circuit of claim 5, wherein the first switching tube is an N-type MOS tube, a drain electrode of the N-type MOS tube is a current input end of the first switching tube, a source electrode of the N-type MOS tube is a current output end of the first switching tube, and a gate electrode of the N-type MOS tube is a control end of the first switching tube.
7. A dual backlight LED arrangement, characterized in that it comprises an LED dual backlight control circuit as claimed in any one of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710867241.XA CN107481679B (en) | 2017-09-22 | 2017-09-22 | LED double-backlight control circuit and double-backlight LED device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710867241.XA CN107481679B (en) | 2017-09-22 | 2017-09-22 | LED double-backlight control circuit and double-backlight LED device |
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| CN107481679A CN107481679A (en) | 2017-12-15 |
| CN107481679B true CN107481679B (en) | 2023-05-19 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110337159B (en) * | 2019-07-02 | 2024-03-05 | 厦门厦华科技有限公司 | Large-size electronic whiteboard backlight drive circuit with resettable control signals |
| CN112397034A (en) * | 2020-11-02 | 2021-02-23 | 深圳市创维群欣安防科技股份有限公司 | Dimming control circuit and display device |
| CN114170973B (en) * | 2021-11-15 | 2023-03-21 | 浙江大华技术股份有限公司 | Backlight control signal self-adaption device and method |
| TWI796073B (en) * | 2021-12-30 | 2023-03-11 | 瑞軒科技股份有限公司 | Light-emitting diode device, operating method of the same, and display device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102262860A (en) * | 2011-06-13 | 2011-11-30 | 惠州市德赛汽车电子有限公司 | Liquid crystal display and backlight driving device thereof |
| CN202502724U (en) * | 2012-01-10 | 2012-10-24 | 广州视源电子科技股份有限公司 | Circuit with liquid crystal display backlight pulse width modulation dimming and direct-current voltage dimming |
| WO2014110850A1 (en) * | 2013-01-21 | 2014-07-24 | 深圳市华星光电技术有限公司 | Backlight drive circuit overvoltage protection method |
| CN104637451A (en) * | 2015-03-09 | 2015-05-20 | 联想(北京)有限公司 | Display control method and electronic equipment |
| CN207425325U (en) * | 2017-09-22 | 2018-05-29 | 合肥惠科金扬科技有限公司 | A kind of double backlight control circuits of LED and double backlight LED matrixs |
-
2017
- 2017-09-22 CN CN201710867241.XA patent/CN107481679B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102262860A (en) * | 2011-06-13 | 2011-11-30 | 惠州市德赛汽车电子有限公司 | Liquid crystal display and backlight driving device thereof |
| CN202502724U (en) * | 2012-01-10 | 2012-10-24 | 广州视源电子科技股份有限公司 | Circuit with liquid crystal display backlight pulse width modulation dimming and direct-current voltage dimming |
| WO2014110850A1 (en) * | 2013-01-21 | 2014-07-24 | 深圳市华星光电技术有限公司 | Backlight drive circuit overvoltage protection method |
| CN104637451A (en) * | 2015-03-09 | 2015-05-20 | 联想(北京)有限公司 | Display control method and electronic equipment |
| CN207425325U (en) * | 2017-09-22 | 2018-05-29 | 合肥惠科金扬科技有限公司 | A kind of double backlight control circuits of LED and double backlight LED matrixs |
Non-Patent Citations (1)
| Title |
|---|
| 张培 ; .一种新型高效LED背光源驱动控制电路设计.电源技术.2013,(10),全文. * |
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| CN107481679A (en) | 2017-12-15 |
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