CN106057136B - A kind of remote controler white backlight liquid crystal display control circuit - Google Patents
A kind of remote controler white backlight liquid crystal display control circuit Download PDFInfo
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- CN106057136B CN106057136B CN201610624401.3A CN201610624401A CN106057136B CN 106057136 B CN106057136 B CN 106057136B CN 201610624401 A CN201610624401 A CN 201610624401A CN 106057136 B CN106057136 B CN 106057136B
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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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- Computer Hardware Design (AREA)
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- Theoretical Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
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Abstract
The invention discloses a kind of remote controler white backlight liquid crystal display control circuits: including power supply, governor circuit, booster circuit, on-off control circuit, white light-emitting diodes LED；The positive voltage input terminal of governor circuit is connected with the anode of power supply, negative voltage input terminal is connected with the cathode of power supply, booster circuit and on-off control circuit are controlled to a power supply, first output end of governor circuit is connected with the input terminal of booster circuit, the second output terminal of governor circuit is connected with the input terminal of on-off control circuit, the output end of booster circuit is connected with the anode of white light LEDs, and the output end of on-off control circuit is connected with the cathode of white light LEDs.It is applied to the white backlight liquid crystal display control circuit of remote controler in the present invention, the higher white light backlight of driving voltage is worked under lower power source supplying voltage, and as the consumption of electric quantity of power supply, light display are stablized, brightness uniformity is unchanged；Power consumption can also be reduced, extends the service life of power supply to the greatest extent.
Description
Technical field
The present invention relates to a kind of remote control circuitry more particularly to a kind of remote controler white backlight liquid crystal display control circuits.
Background technique
The domestic electric appliance (such as washing machine, water heater, air-conditioning, television set etc.) being used widely in life
On be generally fitted with remote controler.Remote controler liquid crystal screen backlight mostly uses common color LED at present, such as orange light LED, green light LED
It is constituted Deng, control circuit using basic resistance, triode, it is by light guide plate that light is equal by the light on and off of single-chip microcontroller control LED
Even spreads on liquid crystal display.
The prior art has the disadvantages that
One, the backlight illumination of liquid crystal display can be constantly dimmed with exhausting for power supply of remote controller electricity.
Two, usual remote controler is slightly above 3.0V using two sections 7 alkaline power supply power supplies, two section new power supply voltages, with
Electric quantity of power supply exhaust, the increase of the internal resistance of source, output voltage can be reduced to 3V quickly hereinafter, for currently used colour
For LED backlight, because its driving voltage is in 1.7V, so still light, but brightness can be dimmed；For white LED backlight
For source, since driving voltage is in 3V or so, it can not be lighted at all.
Summary of the invention
In order to which solve in the prior art can not effectively start remote controler white LED backlight source when power source supplying voltage is lower
The technical issues of, the present invention provides a kind of remote controler liquid crystal display control circuits.
The present invention provides a kind of remote controler white backlight liquid crystal display control circuits, including power supply, governor circuit, boosting
Circuit, on-off control circuit, white light-emitting diodes LED；The positive phase of the positive voltage input terminal of the governor circuit and the power supply
Even, negative voltage input terminal is connected with the cathode of the power supply, the booster circuit and the on-off control circuit with the electricity
Source is connected, and the first output end of the governor circuit is connected with the input terminal of the booster circuit, the governor circuit
Second output terminal is connected with the input terminal of the on-off control circuit, the output end of the booster circuit and the white light LEDs
Anode be connected, the output end of the on-off control circuit is connected with the cathode of the white light LEDs.
Above-mentioned remote controler white backlight liquid crystal display control circuit also has the following characteristics that
The governor circuit includes micro-control unit MCU chip；The power pins of the MCU chip and the power supply are just
Pole connection, grounding pin are connect with the cathode of the power supply, and the enabled pin of the MCU chip is that first output end is used for
Export pulse modulation control signal；The switch pin of the MCU chip is the second output terminal for exporting on-off control letter
Number.
Above-mentioned remote controler white backlight liquid crystal display control circuit also has the following characteristics that
The booster circuit includes: DC boosting chip, the first inductance, first capacitor, first diode；
The DC boosting chip includes input pin, output pin, grounding pin, clipping output pin；The direct current
The input pin of boost chip is the input terminal of the booster circuit, and the output pin of the DC boosting chip is the boosting
The output end of circuit；The grounding pin of the DC boosting chip is connect with the cathode of the power supply；
The first end of first inductance is connect with the clipping output pin of the DC boosting chip, second end with it is described
The anode connection of power supply；
One end of the first capacitor is connect with the second end of first inductance, and the cathode of the other end and the power supply connects
It connects；
The anode of the first diode is connect with the first end of first inductance, cathode and the DC boosting chip
Output pin connection.
Above-mentioned remote controler white backlight liquid crystal display control circuit also has the following characteristics that
The booster circuit further includes being connected between the ground terminal of the DC boosting chip and the cathode of the power supply
Filter capacitor.
Above-mentioned remote controler white backlight liquid crystal display control circuit also has the following characteristics that
The on-off control circuit includes: first resistor, second resistance, 3rd resistor and triode；
One end of the first resistor is connect with the base stage of the triode, and the other end is the defeated of the on-off control circuit
Enter end；
The second resistance is connected between the base stage and emitter of the triode；
One end of the 3rd resistor is connect with the collector of the triode, and the other end of the 3rd resistor is on-off
The output end of control circuit；
The emitter of the triode is connect with the cathode of the power supply.
Above-mentioned remote controler white backlight liquid crystal display control circuit also has the following characteristics that
The DC boosting chip includes: the second diode, third diode, the 4th diode, the 4th resistance, the 5th electricity
Resistance, the control of the second capacitor, amplifier, reference voltage circuit, phase compensating circuit, soft starting circuit, pulse width modulation (PWM)
Device, crystal oscillator, driving circuit, limiter, power switch；
The anode of second diode is connected to the grounding pin, cathode is connected to the output pin；Described
The anode of three diodes is connected to the grounding pin, cathode is connected to the input pin；The anode of 4th diode
It is connected to the grounding pin, cathode is connected to the clipping output pin；
The first end of 4th resistance is connected to the output pin, and second end is connected to the first of the 5th resistance
End, the second end of the 5th resistance are connected to the grounding pin；Connect between the first end and second end of 4th resistance
It is connected to second capacitor；The second end of 4th resistance is connected to the positive input of the amplifier, the benchmark electricity
The output end of volt circuit is connected to the reverse input end of the amplifier, and the input terminal of the reference voltage circuit is connected to described
Input pin；The output end of the amplifying circuit is connected to the first input end of the phase compensating circuit, the reference voltage
The output end of circuit is connected to the second input terminal of the phase compensating circuit, and the output end of the soft starting circuit is connected to institute
The third input terminal of phase compensating circuit is stated, the output end of the phase compensating circuit is connected to the first of the PWM controller
Input terminal, the output end of the limiter are connected to the second input terminal of the PWM controller, the output end connection of the crystal oscillator
In the third input terminal of the PWM controller, the output end of the PWM controller is connected to the input terminal of the driving circuit,
The power switch is connected between the output end of the driving circuit and the clipping output pin, the input of the limiter
End is connected to the clipping output pin.
Above-mentioned remote controler white backlight liquid crystal display control circuit also has the following characteristics that
Second diode, the third diode, the 4th diode are Schottky diode.
Above-mentioned remote controler white backlight liquid crystal display control circuit also has the following characteristics that
The power switch be gold oxygen semiconductor field effect transistor, the grid of this gold oxygen semiconductor field effect transistor with
The output end of the driving circuit is connected, and source electrode is connect with grounding pin, and drain electrode is connect with clipping output pin.
It is applied to the white backlight liquid crystal display control circuit of remote controler in the present invention, so that the higher white light of driving voltage
Backlight can work under lower power source supplying voltage, and with the consumption of electric quantity of power supply, and light display is stablized, brightness uniformity without
Variation；Power consumption can also be reduced, extends the service life of power supply to the greatest extent.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the structure chart of remote controler white backlight liquid crystal display control circuit in embodiment；
Fig. 2 is the concrete structure diagram of remote controler white backlight liquid crystal display control circuit in embodiment；
Fig. 3 is the structure chart of DC boosting chip in embodiment；
Fig. 4 is another structure chart of DC boosting chip in embodiment.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.It needs
Illustrate, in the absence of conflict, the features in the embodiments and the embodiments of the present application can mutual any combination.
Fig. 1 is the structure chart of remote controler white backlight liquid crystal display control circuit in embodiment；With reference to Fig. 1, remote controler is white
Color backlight liquid crystal display control circuit includes power supply, governor circuit, booster circuit, on-off control circuit, white light-emitting diodes LED.
Wherein, the positive voltage input terminal of governor circuit is connected with the anode of power supply, and negative voltage input terminal is connected with the cathode of power supply, boosting
Circuit and on-off control circuit are controlled to a power supply, and the first output end of governor circuit is connected with the input terminal of booster circuit
It connects, the second output terminal of governor circuit is connected with the input terminal of on-off control circuit, the output end and white light LEDs of booster circuit
Anode be connected, the output end of on-off control circuit is connected with the cathode of white light LEDs.
Above-mentioned entire control circuit carries out boosting processing to the low-voltage of input by power supply power supply, booster circuit to stablize
Output 5V voltage, by governor circuit control booster circuit export 5V voltage time length, so that it is every to control white light LEDs
The duration lighted in a time cycle；And the light on and off of white light LEDs are controlled by on-off control circuit.
Fig. 2 is the concrete structure diagram of remote controler white backlight liquid crystal display control circuit in embodiment.Wherein, governor circuit
For micro-control unit (Microcontroller Unit, abbreviation MCU) chip.The power pins of MCU chip and the anode of power supply
The cathode of connection, grounding pin and power supply connects, and the CE pin for stating MCU chip is the first output end of governor circuit for exporting
Pulse modulation control signal；The switch pin of MCU chip is that the second output terminal of governor circuit controls signal for exporting on-off.
Booster circuit includes: DC boosting chip, the first inductance, first capacitor, first diode.DC boosting chip packet
Include input pin 1, output pin 2, grounding pin 3, clipping output pin 4.The input pin of DC boosting chip is boosting electricity
The input terminal on road, the output pin of DC boosting chip are the output end of booster circuit；The grounding pin of DC boosting chip with
The cathode of power supply connects.The first end of first inductance L1 is connect with the clipping output pin of DC boosting chip, second end and electricity
The anode connection in source；One end of first capacitor C1 is connect with the second end of the first inductance, the cathode connection of the other end and power supply；The
The anode of one diode D1 is connect with the first end of the first inductance L1, and cathode is connect with the output pin of DC boosting chip.?
On the basis of above-mentioned booster circuit, another booster circuit further includes being connected to the ground terminal of DC boosting chip and bearing for power supply
Filter capacitor between pole.Wherein, first diode D1 is Schottky diode.
On-off control circuit includes: first resistor R1, second resistance R2,3rd resistor R3 and triode N1.First resistor
One end of R1 is connect with the base stage of triode N1, and the other end is the input terminal of on-off control circuit；Second resistance R2 is connected to three
Between the base stage and emitter of pole pipe N1；One end of 3rd resistor R3 is connect with the collector of triode N1,3rd resistor R3's
The other end is the output end of on-off control circuit；The emitter of triode N1 and the cathode of power supply connect.
In circuit in Fig. 2, in 0.2V or more, first diode D1 can stablize the input voltage VCC of booster circuit
Export 5V voltage.Filter capacitor E1 calms down the ripple voltage of output to maintain output voltage.First diode D1 is for playing
Rectified action.R3 is that current-limiting resistance is used to limit the operating current by white light LEDs.Triode N1 connects over the ground to control LED
The on-off connect, to guarantee reliably opening and turn off for N1, MCU chip is controlled by switch pin (i.e. ON/OFF foot) by R1, R2
N1's opens shutdown, and when switch pin is low level, N1 shutdown, LED1 passes through extinguishing because of no current；When switch pin is height
When level, N1 conducting, LED1 electric current has electric current to pass through, and LED1 is lighted.MCU controls the work of DC boosting chip by input pin
State, DC boosting chip works normally output 5V when input pin high level, and DC boosting chip stops when input pin low level
Work does not export 5V voltage, and MCU passes through CE foot output pulse width modulation (Pulse Width Modulation, abbreviation PWM)
Signal controls the work of DC boosting chip and forbids.By adjusting different pwm pulse width, LED1 is made to show difference
Brightness.Button for adjusting pwm pulse width is set on a remote control, and user, which then can be convenient to use, controls the bright of LED1
Degree.
Fig. 3 is the structure chart of DC boosting chip in embodiment.DC boosting chip includes: the second diode D2, third
Diode D3, the 4th diode D4, the 4th resistance R4, the 5th resistance R5, the second capacitor C2, amplifier, reference voltage circuit, phase
Bit compensation circuit, soft starting circuit, PWM controller, crystal oscillator, driving circuit, limiter, power switch.Ground connection symbol in Fig. 3
It is to refer to the accession to grounding pin 3.
The anode of second diode D2 is connected to grounding pin, cathode is connected to output pin；Third diode D3 is just
Pole is connected to grounding pin 3, cathode is connected to input pin 1；The anode of 4th diode D4 is connected to grounding pin 3, cathode
It is connected to clipping output pin 4；
The first end of 4th resistance R4 is connected to output pin 2, and second end is connected to the first end of the 5th resistance R5, and the 5th
The second end of resistance is connected to grounding pin 3；The second capacitor is connected between the first end and second end of 4th resistance；4th electricity
The second end of resistance is connected to the positive input of amplifier, and the output end of reference voltage circuit is connected to the reversed input of amplifier
End, the input terminal of reference voltage circuit are connected to input pin；The output end of amplifying circuit is connected to the of phase compensating circuit
One input terminal, the output end of reference voltage circuit are connected to the second input terminal of phase compensating circuit, the output of soft starting circuit
End is connected to the third input terminal of phase compensating circuit, and it is first defeated to be connected to PWM controller for the output end of phase compensating circuit
Enter end, the output end of limiter is connected to the second input terminal of PWM controller, and the output end of crystal oscillator is connected to PWM controller
Third input terminal, the output end of PWM controller are connected to the input terminal of driving circuit, and power switch is connected to the defeated of driving circuit
Between outlet and clipping output pin 4, the input terminal of limiter is connected to clipping output pin 4.
Wherein, the second diode D2, third diode D3, the 4th diode D4 are Schottky diode.
Fig. 4 is another structure chart of DC boosting chip in embodiment.In this figure, power switch is OH crystal
Pipe MOSFET, wherein the grid of this transistor is connected with the output end of the driving circuit, and source electrode is connect with grounding pin 3,
Drain electrode is connected with clipping output pin 4.
Fig. 3 is the structure chart of DC boosting chip in embodiment.
In the present solution, inductance L1 in the power switch (MOSFET) and booster circuit that pass through DC boosting built-in chip type, two
Pole pipe D1 forms basic inductance boost Boost circuit, completes boost function, by built-in reference circuit and comparator,
MOSFET driving, control export stable voltage.
This programme uses a kind of lower cost solution, realizes to common power powered remote controller white light LCD screen back light source
Control, solve the problems, such as backlight illumination with supply voltage reduce and it is gradually dimmed.This programme uses single-chip microcontroller control boosting
Circuit and on-off control circuit realize the control to remote controler liquid crystal screen backlight, it is ensured that the backlight when supply voltage reduces
Brightness will not change；User can be allowed voluntarily to adjust backlight illumination, flexibility ratio is big, realizes the best visual effect, and can be with
The power consumption of backlight is effectively reduced, while when electric quantity of power supply drops to very low it is also ensured that normal backlight illumination, extends power supply
Use the time.
Descriptions above can combine implementation individually or in various ways, and these variants all exist
Within protection scope of the present invention.
Those of ordinary skill in the art will appreciate that all or part of the steps in the above method can be instructed by program
Related hardware is completed, and described program can store in computer readable storage medium, such as read-only memory, disk or CD
Deng.Optionally, one or more integrated circuits also can be used to realize, accordingly in all or part of the steps of above-described embodiment
Ground, each module/unit in above-described embodiment can take the form of hardware realization, can also use the shape of software function module
Formula is realized.The present invention is not limited to the combinations of the hardware and software of any particular form.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that including the article of a series of elements or equipment not only includes those elements, but also including not having
There is the other element being expressly recited, or further includes for this article or the intrinsic element of equipment.Do not limiting more
In the case where system, the element that is limited by sentence " including ... ", it is not excluded that in the article or equipment for including the element
There is also other identical elements.
The above examples are only used to illustrate the technical scheme of the present invention and are not limiting, reference only to preferred embodiment to this hair
It is bright to be described in detail.Those skilled in the art should understand that can modify to technical solution of the present invention
Or equivalent replacement should all cover in claim model of the invention without departing from the spirit and scope of the technical solution of the present invention
In enclosing.
Claims (7)
1. a kind of remote controler white backlight liquid crystal display control circuit, which is characterized in that including power supply, governor circuit, boosting electricity
Road, on-off control circuit, white light-emitting diodes LED；The positive voltage input terminal of the governor circuit is connected with the anode of the power supply,
Negative voltage input terminal is connected with the cathode of the power supply；The booster circuit and the on-off control circuit with the power supply phase
Connection, the first output end of the governor circuit are connected with the input terminal of the booster circuit, and the second of the governor circuit
Output end is connected with the input terminal of the on-off control circuit, and the output end of the booster circuit and the white light LEDs are just
Pole is connected, and the output end of the on-off control circuit is connected with the cathode of the white light LEDs；
The booster circuit includes: DC boosting chip, the first inductance, first capacitor, first diode；
The DC boosting chip includes input pin, output pin, grounding pin, clipping output pin；The DC boosting
The input pin of chip is the input terminal of the booster circuit, and the output pin of the DC boosting chip is the booster circuit
Output end；The grounding pin of the DC boosting chip is connect with the cathode of the power supply；
The first end of first inductance is connect with the clipping output pin of the DC boosting chip, second end and the power supply
Anode connection；
One end of the first capacitor is connect with the second end of first inductance, and the other end is connect with the cathode of the power supply；
The anode of the first diode is connect with the first end of first inductance, and cathode is defeated with the DC boosting chip
Pin connects out.
2. remote controler white backlight liquid crystal display control circuit as described in claim 1, which is characterized in that the governor circuit
Including micro-control unit MCU chip；The power pins of the MCU chip are connect with the anode of the power supply, grounding pin and institute
The cathode connection of power supply is stated, the enabled pin of the MCU chip is first output end for exporting impulse modulation control letter
Number；The switch pin of the MCU chip is the second output terminal for exporting on-off control signal.
3. remote controler white backlight liquid crystal display control circuit as described in claim 1, which is characterized in that the booster circuit
It further include the filter capacitor being connected between the ground terminal of the DC boosting chip and the anode of the power supply.
4. remote controler white backlight liquid crystal display control circuit as described in claim 1, which is characterized in that the on-off control
Circuit includes: first resistor, second resistance, 3rd resistor and triode；
One end of the first resistor is connect with the base stage of the triode, and the other end is the input of the on-off control circuit
End；
The second resistance is connected between the base stage and emitter of the triode；
One end of the 3rd resistor is connect with the collector of the triode, and the other end of the 3rd resistor is on-off control
The output end of circuit；
The emitter of the triode is connect with the cathode of the power supply.
5. remote controler white backlight liquid crystal display control circuit as described in claim 1, which is characterized in that the DC boosting
Chip include: the second diode, third diode, the 4th diode, the 4th resistance, the 5th resistance, the second capacitor, amplifier,
Reference voltage circuit, phase compensating circuit, soft starting circuit, pulse width modulation (PWM) controller, crystal oscillator, driving circuit, clipping
Device, power switch；
The anode of second diode is connected to the grounding pin, cathode is connected to the output pin；Described 3rd 2
The anode of pole pipe is connected to the grounding pin, cathode is connected to the input pin；The anode connection of 4th diode
The clipping output pin is connected in the grounding pin, cathode；
The first end of 4th resistance is connected to the output pin, and second end is connected to the first end of the 5th resistance,
The second end of 5th resistance is connected to the grounding pin；It is connected between the first end and second end of 4th resistance
Second capacitor；The second end of 4th resistance is connected to the positive input of the amplifier, the reference voltage electricity
The output end on road is connected to the reverse input end of the amplifier, and the input terminal of the reference voltage circuit is connected to the input
Pin；The output end of the amplifier is connected to the first input end of the phase compensating circuit, the reference voltage circuit
Output end is connected to the second input terminal of the phase compensating circuit, and the output end of the soft starting circuit is connected to the phase
The third input terminal of compensation circuit, the output end of the phase compensating circuit are connected to the first input end of the PWM controller,
The output end of the limiter is connected to the second input terminal of the PWM controller, and the output end of the crystal oscillator is connected to described
The third input terminal of PWM controller, the output end of the PWM controller are connected to the input terminal of the driving circuit, the function
Rate switch is connected between the output end of the driving circuit and the clipping output pin, the input terminal connection of the limiter
In the clipping output pin.
6. remote controler white backlight liquid crystal display control circuit as claimed in claim 5, which is characterized in that the two or two pole
Pipe, the third diode, the 4th diode are Schottky diode.
7. remote controler white backlight liquid crystal display control circuit as claimed in claim 5, which is characterized in that the power switch
For gold oxygen semiconductor field effect transistor, the output end of the grid of this gold oxygen semiconductor field effect transistor and the driving circuit
It is connected, source electrode is connect with grounding pin, and drain electrode is connect with clipping output pin.
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| CN106354075B (en) * | 2016-11-25 | 2020-01-21 | 北京意同创科技有限公司 | Remote controller control circuit with backlight screen |
| CN108652564B (en) * | 2018-05-14 | 2022-03-11 | 佛山市顺德区美的洗涤电器制造有限公司 | Automatic wake-up method and device for dish washer and computer readable storage medium |
| CN110060641A (en) * | 2019-04-23 | 2019-07-26 | 深圳市华星光电技术有限公司 | Display system circuit and display device |
| CN111127864A (en) * | 2020-01-03 | 2020-05-08 | 广东好太太科技集团股份有限公司 | Custom remote control system applied to clothes airing machine and setting method thereof |
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