CN106875897A - A kind of touch-screen automatic brightness regulation circuit - Google Patents
A kind of touch-screen automatic brightness regulation circuit Download PDFInfo
- Publication number
- CN106875897A CN106875897A CN201611208657.2A CN201611208657A CN106875897A CN 106875897 A CN106875897 A CN 106875897A CN 201611208657 A CN201611208657 A CN 201611208657A CN 106875897 A CN106875897 A CN 106875897A
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- CN
- China
- Prior art keywords
- low
- light
- circuit
- touch
- regulation circuit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention provides a kind of touch-screen automatic brightness regulation circuit, low-light collection change-over circuit, MCU governor circuits, LED luminance regulation circuit are provided with；The electrical signal of the low-light collection change-over circuit exports the low-light electric signal of the ambient light intensity-conversion by gathering；The low-light electric signal input end of the MCU governor circuits connects the electrical signal that the low-light gathers change-over circuit, the MCU governor circuits export corresponding PWM dim signals when the voltage for detecting the low-light electric signal changes by PWM dim signals output end；The Regulate signal input of the LED luminance regulation circuit connects the PWM dim signal output ends of the MCU governor circuits, and brightness of the PWM dim signals according to input to LED is adjusted.Implement a kind of touch-screen automatic brightness regulation circuit that the present invention is provided, can realize that touch-screen brightness is automatically adjusted according to ambient brightness, more hommization and intellectuality also can more embody modern sense and strengthen Consumer's Experience.
Description
Technical field
The present invention relates to light regulating technology field, more particularly to a kind of touch-screen automatic brightness regulation circuit.
Background technology
Increasing automotive air-conditioning controller is operated using touch key-press now, can more embody modern sense also more
Consumer's Experience can be strengthened, but the automotive air-conditioning controller backlight of most of use touch key-press all can not be according to environment at present
Light intensity in real time and automatically regulates the power of light, is only capable of according to lamp line Signal Regulation, and user can be caused to regard thing
When light it is too dazzling or very dark, inadequate hommization and intellectuality.
The content of the invention
The present invention provides a kind of touch-screen automatic brightness regulation circuit, solves low-light of the setting containing low-light level sensor and adopts
The circuit is simultaneously connected MCU governor circuits with LED control circuit by collection change-over circuit, is gathered by MCU governor circuits treatment low-light
Corresponding brightness regulated signal is exported after the electric signal of change-over circuit so as to act on LED to realize touch-screen automatic brightness adjustment
Technical problem.
To solve above technical problem, the present invention provides a kind of touch-screen automatic brightness regulation circuit, is provided with low-light collection
Change-over circuit, MCU governor circuits, LED luminance regulation circuit；
The electrical signal of the low-light collection change-over circuit exports the low-light of the ambient light intensity-conversion by gathering
Electric signal；
The low-light electric signal input end of the MCU governor circuits connects the electric signal output that the low-light gathers change-over circuit
End, the MCU governor circuits are exported when the voltage for detecting the low-light electric signal changes by PWM dim signals
The corresponding PWM dim signals of end output；
The PWM dim signals that the Regulate signal input of the LED luminance regulation circuit connects the MCU governor circuits are defeated
Go out end, brightness of the PWM dim signals according to input to LED is adjusted.
Further, the low-light collection change-over circuit is provided with low-light level sensor；The low-light level sensor includes photosensitive two
Pole pipe, data selector and operational amplifier；
The photodiode forward direction is connected to the collection signal input part and collection signal output of the operational amplifier
Between end；
The address input end of the data selector first is connected with the first pull-up resistor, the second ground of the data selector
Location input is connected with the first pull down resistor；The low and high level output end of the data selector connects the operational amplifier
Mode of operation selects input.
Further, the low-light collection change-over circuit is additionally provided with pressure filter circuit；The RC pressure filter circuits
Including the first divider resistance and the first filter capacitor that are parallel between the electrical signal and ground.
Further, the energization input of the low-light collection change-over circuit is connected with the second pull-up resistor；It is described micro-
Light collection change-over circuit is additionally provided with one end and connects the energization input, the second filter capacitor of other end ground connection.
Further, the LED luminance regulation circuit is provided with triode and LED；The base stage connection of the triode is described
Regulate signal input, grounded emitter, colelctor electrode connects the negative pole end of the LED, the positive terminal connection power supply electricity of the LED
Source.
Further, it is also associated with the first protective resistance between the base stage and emitter stage of the triode.
Further, connect between the Regulate signal input and the base stage of the triode of the LED luminance regulation circuit
It is connected to the second divider resistance.
Further, the first current-limiting resistance and the second limit are parallel between the negative pole end of the LED and the power supply
Leakage resistance.
A kind of touch-screen automatic brightness regulation circuit that the present invention is provided, can be obtained in real time by setting low-light level sensor
Ambient light intensity, and corresponding current signal to MCU governor circuits is exported, export corresponding after being processed by MCU governor circuits
Brightness regulated signal output further acts on LED by triode to realize touch-screen automatic brightness adjustment, very to triode
Good solves the problems, such as constant, more the hommization and intellectuality of current touch-screen light power, also can more embody the modern times
Feel and strengthen Consumer's Experience.
Brief description of the drawings
Fig. 1 is a kind of circuit theory diagrams of touch-screen automatic brightness regulation circuit that the present invention is provided；
Fig. 2 is a kind of model selection principle of the data selector of touch-screen automatic brightness regulation circuit that the present invention is provided
Schematic diagram.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described.The value size of following component is only preferred embodiment, does not constitute limiting the scope of the invention.
A kind of circuit theory diagrams of the touch-screen automatic brightness regulation circuit provided referring to Fig. 1, the present invention.In the present embodiment
In, a kind of described touch-screen automatic brightness regulation circuit is provided with low-light collection change-over circuit 10, MCU governor circuits 20, LED
Brightness regulating circuit 30；
The electrical signal Iout of the low-light collection change-over circuit 10 exports the ambient light intensity-conversion by gathering
Low-light electric signal；
The low-light electric signal input end LIGHT_SENSOR of the MCU governor circuits 20 connects the low-light collection conversion electricity
The electrical signal Iout on road 10, the MCU governor circuits 20 change in the voltage for detecting the low-light electric signal
When, corresponding PWM dim signals are exported by PWM dim signal output ends LIGHT_SENSOR_OUT；
The Regulate signal input ILL_PWM of the LED luminance regulation circuit 30 connects the MCU governor circuits 20
PWM dim signal output end LIGHT_SENSOR_OUT, the brightness according to the PWM dim signals being input into LED is adjusted.
In the present embodiment, the low-light collection change-over circuit 10 is provided with low-light level sensor Q1；The low-light level sensor Q1
Internal circuit includes photodiode PD, data selector Loglc and operational amplifier CA；
The photodiode PD forward directions are connected to the collection signal input part CA_PIN1 of the operational amplifier CA and adopt
Between collection signal output part CA_PIN2；
The first address input end GC1 of the data selector Loglc is connected with the first pull-up resistor R1, the data choosing
The the second address input end GC2 for selecting device Loglc is connected with the first pull down resistor R2；The height electricity of the data selector Loglc
Flat output end Mode connects the mode of operation selection input CA_PIN3 of the operational amplifier CA, the operational amplifier
CA_PIN4 ends are grounded.
In the present embodiment, the low-light collection change-over circuit 10 is additionally provided with pressure filter circuit 100；The RC partial pressures filter
Wave circuit 100 includes the first divider resistance R3 and the first filter capacitor that are parallel between the electrical signal Iout and ground
C1；The energization input VCC of the low-light collection change-over circuit 10 is connected with the second pull-up resistor R4；The low-light collection conversion
Circuit 10 is additionally provided with one end and connects the energization input VCC, the second filter capacitor C2 of other end ground connection；The LED luminance
Regulation circuit 30 is provided with triode Q2 and LED；The base stage b of the triode Q2 connects the Regulate signal input ILL_PWM,
Emitter e is grounded, and colelctor electrode c connects the negative pole end of the LED, the positive terminal connection power supply line KL30_LED of the LED；
The first protective resistance R5 is also associated between the base stage b and emitter e of the triode Q2；The LED luminance adjusts circuit 30
Regulate signal input ILL_PWM and the base stage b of the triode Q2 between be connected with the second divider resistance R6；The LED
Negative pole end and the power supply VCC between be parallel with the first current-limiting resistance R7 and the second current-limiting resistance R8.
In the present embodiment, photodiode PD collections ambient light intensity, the computing according to different light intensities
Amplifier C A export different corresponding current sizes；With reference to Fig. 2, first address input end of the data selector Loglc
The low and high level situation of GC1 and the second address input end GC2 determines that the low-light gathers the mode of operation of change-over circuit 10, pattern
Difference, the size of current ability and grade of the electrical signal Iout outputs is different, wherein, " Shutdown " is represented without letter
Number output, " H-Gain Mode " represents high level current output, and " M-Gain Mode " represents intermediate electric current and export, " L-Gain
Mode " represents rudimentary electric current output；The first divider resistance R3 determines the low-light electric signal input end LIGHT_SENSOR
Voltage Viout sizes, such as computing formula is under selection H-Gain Mode shown in the figure：Viout=0.57*10-6*Ev*
R3 (Ev is light intensity)；The first filter capacitor C1 is in order to prevent ambient light to be mutated, so as to influence Viout to be mutated.
Fig. 1 is referred again to, when light intensity becomes strong, the low-light level sensor Q1 collection light intensity is simultaneously converted to corresponding telecommunications
Number, can obtain Viout by formula can become big, so that the low-light electric signal input end LIGHT_SENSOR of the MCU governor circuits 20
Voltage Viout increases are detected, MCU exports correspondence PWM dim signals and adjusts circuit 30, the triode to the LED luminance
Q2 conducting degree is increased, so as to reduce its colelctor electrode c voltages, increases the electric current of the LED, and lamplight brightness is strengthened；Work as environment
Light intensity dies down, and the low-light level sensor Q1 gathers light intensity, and can obtain Viout by formula can diminish, so that MCU governor circuits 20
Low-light electric signal input end LIGHT_SENSOR detect voltage Viout reductions, MCU exports corresponding PWM dim signals and arrives
The brightness regulating circuit LED30, makes the triode Q2 conductings degree reduction, so as to raise the voltage of its colelctor electrode c, makes
The electric current of LED reduces, and lamplight brightness weakens, so as to realize the Automatic adjusument of LED luminance.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (8)
1. a kind of touch-screen automatic brightness regulation circuit, it is characterised in that be provided with low-light collection change-over circuit, MCU governor circuits,
LED luminance adjusts circuit；
The electrical signal of the low-light collection change-over circuit exports the low-light telecommunications of the ambient light intensity-conversion by gathering
Number；
The low-light electric signal input end of the MCU governor circuits connects the electrical signal that the low-light gathers change-over circuit,
The MCU governor circuits are defeated by PWM dim signal output ends when the voltage for detecting the low-light electric signal changes
Go out corresponding PWM dim signals；
The Regulate signal input of the LED luminance regulation circuit connects the PWM dim signals output of the MCU governor circuits
End, the brightness according to the PWM dim signals being input into LED is adjusted.
2. a kind of touch-screen automatic brightness regulation circuit as claimed in claim 1, it is characterised in that：The low-light collection conversion
Circuit is provided with low-light level sensor；The low-light level sensor includes photodiode, data selector and operational amplifier；
The photodiode forward direction be connected to the operational amplifier collection signal input part and collection signal output part it
Between；
The address input end of the data selector first is connected with the first pull-up resistor, and the second address of the data selector is defeated
Enter end and be connected with the first pull down resistor；The low and high level output end of the data selector connects the work of the operational amplifier
Mode selection input.
3. a kind of touch-screen automatic brightness regulation circuit as claimed in claim 2, it is characterised in that：The low-light collection conversion
Circuit is additionally provided with pressure filter circuit；The RC pressure filter circuits include being parallel between the electrical signal and ground
First divider resistance and the first filter capacitor.
4. a kind of touch-screen automatic brightness regulation circuit as claimed in claim 3, it is characterised in that：The low-light collection conversion
The energization input of circuit is connected with the second pull-up resistor；The low-light collection change-over circuit is additionally provided with one end and connects the power supply
Input, the second filter capacitor of other end ground connection.
5. a kind of touch-screen automatic brightness regulation circuit as claimed in claim 1, it is characterised in that：The LED luminance regulation
Circuit is provided with triode and LED；The base stage of the triode connects the Regulate signal input, grounded emitter, colelctor electrode
Connect the negative pole end of the LED, the positive terminal connection power supply of the LED.
6. a kind of touch-screen automatic brightness regulation circuit as claimed in claim 5, it is characterised in that：The base stage of the triode
The first protective resistance is also associated between emitter stage.
7. a kind of touch-screen automatic brightness regulation circuit as claimed in claim 5, it is characterised in that：The LED luminance regulation
The second divider resistance is connected between the Regulate signal input of circuit and the base stage of the triode.
8. a kind of touch-screen automatic brightness regulation circuit as claimed in claim 5, it is characterised in that：The negative pole end of the LED
The first current-limiting resistance and the second current-limiting resistance are parallel between the power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611208657.2A CN106875897A (en) | 2016-12-23 | 2016-12-23 | A kind of touch-screen automatic brightness regulation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611208657.2A CN106875897A (en) | 2016-12-23 | 2016-12-23 | A kind of touch-screen automatic brightness regulation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106875897A true CN106875897A (en) | 2017-06-20 |
Family
ID=59164993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611208657.2A Pending CN106875897A (en) | 2016-12-23 | 2016-12-23 | A kind of touch-screen automatic brightness regulation circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106875897A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107770912A (en) * | 2017-10-31 | 2018-03-06 | 惠州市德赛西威汽车电子股份有限公司 | A kind of three inexpensive color atmosphere lamp drive circuits |
| CN107864534A (en) * | 2017-11-30 | 2018-03-30 | 惠州市德赛西威汽车电子股份有限公司 | A kind of atmosphere circuit for lamp for automatically controlling brightness |
| CN108401332A (en) * | 2018-04-28 | 2018-08-14 | 惠州市德赛西威汽车电子股份有限公司 | A kind of LED drive circuit exporting constant-current discharge over the ground |
| CN108881890A (en) * | 2018-07-18 | 2018-11-23 | 杭州行开科技有限公司 | A kind of naked eye 3D display system and method based on medical image |
| CN109640449A (en) * | 2018-12-27 | 2019-04-16 | 惠州市德赛西威汽车电子股份有限公司 | A kind of gear indicator lamp brightness automatic control circuit based on sunlight sensor |
| CN109754760A (en) * | 2018-12-27 | 2019-05-14 | 惠州市德赛西威汽车电子股份有限公司 | A kind of instrument board backlight illumination regulating system |
| CN111669867A (en) * | 2020-06-22 | 2020-09-15 | 深圳市元征科技股份有限公司 | Key background lamp circuit of vehicle and brightness adjusting method thereof |
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| CN202871260U (en) * | 2012-08-30 | 2013-04-10 | 飞亚达（集团）股份有限公司 | Backlight adjustment circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107770912A (en) * | 2017-10-31 | 2018-03-06 | 惠州市德赛西威汽车电子股份有限公司 | A kind of three inexpensive color atmosphere lamp drive circuits |
| CN107864534A (en) * | 2017-11-30 | 2018-03-30 | 惠州市德赛西威汽车电子股份有限公司 | A kind of atmosphere circuit for lamp for automatically controlling brightness |
| CN108401332A (en) * | 2018-04-28 | 2018-08-14 | 惠州市德赛西威汽车电子股份有限公司 | A kind of LED drive circuit exporting constant-current discharge over the ground |
| CN108881890A (en) * | 2018-07-18 | 2018-11-23 | 杭州行开科技有限公司 | A kind of naked eye 3D display system and method based on medical image |
| CN109640449A (en) * | 2018-12-27 | 2019-04-16 | 惠州市德赛西威汽车电子股份有限公司 | A kind of gear indicator lamp brightness automatic control circuit based on sunlight sensor |
| CN109754760A (en) * | 2018-12-27 | 2019-05-14 | 惠州市德赛西威汽车电子股份有限公司 | A kind of instrument board backlight illumination regulating system |
| CN111669867A (en) * | 2020-06-22 | 2020-09-15 | 深圳市元征科技股份有限公司 | Key background lamp circuit of vehicle and brightness adjusting method thereof |
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Application publication date: 20170620 |
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| RJ01 | Rejection of invention patent application after publication |