CN111081192A - Two-stage brightness control circuit for backlight lamp of vehicle-mounted multimedia display screen - Google Patents
Two-stage brightness control circuit for backlight lamp of vehicle-mounted multimedia display screen Download PDFInfo
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- CN111081192A CN111081192A CN201911234385.7A CN201911234385A CN111081192A CN 111081192 A CN111081192 A CN 111081192A CN 201911234385 A CN201911234385 A CN 201911234385A CN 111081192 A CN111081192 A CN 111081192A
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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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- 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
- G09G3/3413—Details of control of colour illumination sources
Abstract
The invention aims to provide a two-stage brightness control circuit of a vehicle-mounted multimedia display screen backlight lamp, wherein a display screen backlight LED15, a Q3 and a R2 are connected in series and are connected with a GP-B2 pin of a singlechip of the singlechip, the display screen backlight LED15 is also connected with a R23 which is connected with a Q3 in parallel, and the display screen backlight LED15 is connected with a 9V power supply through a R19; when the GP-B2 pin outputs a low level, Q3 is turned off, and the current I = (9V-4V)/(150R +270R) =11.9mA through the backlight LED 15; when the pin GP-B2 outputs a high level, Q3 is saturated and turned on, which is equivalent to short-circuiting R23, and the current I = (9V-4V)/150R =33.3mA flowing through the LED 15; a GP-B2 pin outputs high level, and the brightness of the backlight source is high; the GP-B2 pin outputs low level, and the backlight brightness is low bright.
Description
Technical Field
The invention relates to the field of vehicle-mounted multimedia of automobiles, in particular to a two-stage brightness control circuit for a backlight lamp of a vehicle-mounted multimedia display screen.
Background
The vehicle-mounted multimedia of the automobile is provided with a display screen, and the display screen needs a backlight lamp to be lightened. At present in on-vehicle multimedia products, need require the display screen backlight to do two-stage brightness control, when daytime external light is stronger, require the display screen light luminance of panel to also improve, and evening external light is darker, and at this moment the light that also needs the display screen is dark, prevents that light is too strong in the car, arouses driver visual fatigue. Therefore, a two-stage brightness control circuit is required. Therefore, it is necessary to solve this problem.
Disclosure of Invention
In order to solve the problems, the invention provides a two-stage brightness control circuit of a vehicle-mounted multimedia display screen backlight lamp, a display screen backlight LED15, a Q3 and a R2 are connected in series and are connected with a GP-B2 pin of a singlechip of the singlechip, the display screen backlight LED15 is also connected with a R23 connected with a Q3 in parallel, and the display screen backlight LED15 is connected with a 9V power supply through a R19; when the GP-B2 pin outputs a low level, Q3 is turned off, and the current I = (9V-4V)/(150R +270R) =11.9mA through the backlight LED 15; when the pin GP-B2 outputs a high level, Q3 is saturated and turned on, which is equivalent to short-circuiting R23, and the current I = (9V-4V)/150R =33.3mA flowing through the backlight LED 15; the single chip microcomputer outputs a high level from a GP-B2 pin, and the brightness of the backlight source is high; the single chip microcomputer outputs a low level from a GP-B2 pin, and the brightness of the backlight source is low and bright, so that two-stage brightness control is realized, and the problems in the background technology are solved.
The invention aims to provide a two-stage brightness control circuit of a vehicle-mounted multimedia display screen backlight lamp, which comprises a display screen backlight LED15, wherein the voltage drop of an LED15 is 4.0V, the LED15 is connected with a TP83 terminal and a TP84 terminal, the TP83 terminal is connected with a triode Q3 and a resistor R23, the Q3 and the R23 are connected in parallel, and the resistor R23 is 270R; the triode Q3 is connected in series with a TP41 terminal, the TP41 terminal is connected in series with R2 and R6, and the resistances of R2 and R6 are respectively 10K and 22K; the R2 is connected with a TP59 terminal in series, and the TP59 terminal is connected with a GP-B2 pin of the singlechip; the TP84 terminal is connected with an R19 in series, the R19 resistor is 150R, the R19 terminal is connected with a TP95 terminal in series, and the TP95 terminal is connected with a 9V power supply; when the GP-B2 pin outputs a low level, Q3 is turned off, and the current I = (9V-4V)/(150R +270R) =11.9mA through the backlight LED 15; when the GP-B2 pin outputs a high level, Q3 is saturated and turned on, which is equivalent to short-circuiting R23, and the current I = (9V-4V)/150R =33.3mA flowing through the backlight LED 15.
The further improvement lies in that: in the daytime, the small lamp is turned off, the backlight source needs to start the second-gear brightness, the single chip microcomputer outputs a high level from the GP-B2 pin, and the brightness of the backlight source is high;
at night, the small lamp is turned on, the backlight source needs to start the first-gear brightness, the single chip microcomputer outputs a low level from the GP-B2 pin, and the brightness of the backlight source is low.
The further improvement lies in that: the R23, the triode Q3 and the R6 are all grounded.
The further improvement lies in that: the display screen backlight source LED15 is composed of two LED light-emitting diodes connected in series, and the forward voltage drop of a single LED is 2.0V, so that the total voltage drop of the series backlight source is 4.0V.
The invention has the beneficial effects that: the display screen backlight LED15, the Q3 and the R2 are connected in series to be connected with a GP-B2 pin of a singlechip of the singlechip, the display screen backlight LED15 is also connected with R23 connected with the Q3 in parallel, and the display screen backlight LED15 is connected with a 9V power supply through R19; when the GP-B2 pin outputs a low level, Q3 is turned off, and the current I = (9V-4V)/(150R +270R) =11.9mA through the backlight LED 15; when the pin GP-B2 outputs a high level, Q3 is saturated and turned on, which is equivalent to short-circuiting R23, and the current I = (9V-4V)/150R =33.3mA flowing through the backlight LED 15; the single chip microcomputer outputs a high level from a GP-B2 pin, and the brightness of the backlight source is high; the single chip microcomputer outputs a low level from a GP-B2 pin, and the brightness of the backlight source is low, so that two-stage brightness control is realized;
the circuit skillfully utilizes the characteristic that the conduction internal resistance of the triode is very small, the CE electrode of the triode is connected in parallel with two ends of the resistor R23, and the resistor R23 is short-circuited when the triode is in saturation conduction, so that two-stage brightness control can be realized. The circuit is simple, stable and reliable, and has strong practicability and popularization.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
For the purpose of enhancing understanding of the present invention, the present invention will be further described in detail with reference to the following examples, which are provided for illustration only and are not to be construed as limiting the scope of the present invention.
As shown in fig. 1, the present embodiment provides a two-stage brightness control circuit for a backlight of a vehicle-mounted multimedia display screen, which includes a display screen backlight LED15, wherein a voltage drop of the LED15 is 4.0V, the LED15 is connected to a TP83 terminal and a TP84 terminal, a TP83 terminal is connected to a triode Q3 and a resistor R23, the Q3 and the R23 are connected in parallel, and the resistor R23 is 270R; the triode Q3 is connected in series with a TP41 terminal, the TP41 terminal is connected in series with R2 and R6, and the resistances of R2 and R6 are respectively 10K and 22K; the R2 is connected with a TP59 terminal in series, and the TP59 terminal is connected with a GP-B2 pin of the singlechip; the TP84 terminal is connected with an R19 in series, the R19 resistor is 150R, the R19 terminal is connected with a TP95 terminal in series, and the TP95 terminal is connected with a 9V power supply; when the GP-B2 pin outputs a low level, Q3 is turned off, and the current I = (9V-4V)/(150R +270R) =11.9mA through the backlight LED 15; when the GP-B2 pin outputs a high level, Q3 is saturated and turned on, which is equivalent to short-circuiting R23, and the current I = (9V-4V)/150R =33.3mA flowing through the backlight LED 15. In the daytime, the small lamp is turned off, the backlight source needs to start the second-gear brightness, the single chip microcomputer outputs a high level from the GP-B2 pin, and the brightness of the backlight source is high; at night, the small lamp is turned on, the backlight source needs to start the first-gear brightness, the single chip microcomputer outputs a low level from the GP-B2 pin, and the brightness of the backlight source is low. The R23, the triode Q3 and the R6 are all grounded. The display screen backlight source LED15 is composed of two LED light-emitting diodes connected in series, and the forward voltage drop of a single LED is 2.0V, so that the total voltage drop of the series backlight source is 4.0V.
The display screen backlight LED15, the Q3 and the R2 are connected in series to be connected with a GP-B2 pin of the singlechip, the display screen backlight LED15 is also connected with R23 connected with the Q3 in parallel, and the display screen backlight LED15 is connected with a 9V power supply through R19; when the GP-B2 pin outputs a low level, Q3 is turned off, and the current I = (9V-4V)/(150R +270R) =11.9mA through the backlight LED 15; when the pin GP-B2 outputs a high level, Q3 is saturated and turned on, which is equivalent to short-circuiting R23, and the current I = (9V-4V)/150R =33.3mA flowing through the backlight LED 15; the single chip microcomputer outputs a high level from a GP-B2 pin, and the brightness of the backlight source is high; the single chip microcomputer outputs a low level from a GP-B2 pin, and the brightness of the backlight source is low, so that two-stage brightness control is realized;
the circuit skillfully utilizes the characteristic that the conduction internal resistance of the triode is very small, the CE electrode of the triode is connected in parallel with two ends of the resistor R23, and the resistor R23 is short-circuited when the triode is in saturation conduction, so that two-stage brightness control can be realized. The circuit is simple, stable and reliable, and has strong practicability and popularization.
Claims (4)
1. The utility model provides a two-stage luminance control circuit of on-vehicle multimedia display screen backlight, includes display screen backlight LED15, and LED15 pressure drop is 4.0V, its characterized in that: the LED15 is connected with a TP83 terminal and a TP84 terminal, the TP83 terminal is connected with a triode Q3 and a resistor R23, Q3 is connected with R23 in parallel, and the resistor R23 is 270R; the triode Q3 is connected in series with a TP41 terminal, the TP41 terminal is connected in series with R2 and R6, and the resistances of R2 and R6 are respectively 10K and 22K; the R2 is connected with a TP59 terminal in series, and the TP59 terminal is connected with a GP-B2 pin of the singlechip; the TP84 terminal is connected with an R19 in series, the R19 resistor is 150R, the R19 terminal is connected with a TP95 terminal in series, and the TP95 terminal is connected with a 9V power supply; when the GP-B2 pin outputs a low level, Q3 is turned off, and the current I = (9V-4V)/(150R +270R) =11.9mA through the backlight LED 15; when the GP-B2 pin outputs a high level, Q3 is saturated and turned on, which is equivalent to short-circuiting R23, and the current I = (9V-4V)/150R =33.3mA flowing through the backlight LED 15.
2. The on-vehicle multimedia display backlight two-stage brightness control circuit as claimed in claim, wherein: in the daytime, the small lamp is turned off, the backlight source needs to start the second-gear brightness, the single chip microcomputer outputs a high level from the GP-B2 pin, and the brightness of the backlight source is high;
at night, the small lamp is turned on, the backlight source needs to start the first-gear brightness, the single chip microcomputer outputs a low level from the GP-B2 pin, and the brightness of the backlight source is low.
3. The on-vehicle multimedia display backlight two-stage brightness control circuit as claimed in claim, wherein: the R23, the triode Q3 and the R6 are all grounded.
4. The on-vehicle multimedia display backlight two-stage brightness control circuit as claimed in claim, wherein: the display screen backlight source LED15 is composed of two LED light-emitting diodes connected in series, and the forward voltage drop of a single LED is 2.0V, so that the total voltage drop of the series backlight source is 4.0V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911234385.7A CN111081192A (en) | 2019-12-05 | 2019-12-05 | Two-stage brightness control circuit for backlight lamp of vehicle-mounted multimedia display screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911234385.7A CN111081192A (en) | 2019-12-05 | 2019-12-05 | Two-stage brightness control circuit for backlight lamp of vehicle-mounted multimedia display screen |
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| CN111081192A true CN111081192A (en) | 2020-04-28 |
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| CN201911234385.7A Pending CN111081192A (en) | 2019-12-05 | 2019-12-05 | Two-stage brightness control circuit for backlight lamp of vehicle-mounted multimedia display screen |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111787657A (en) * | 2020-08-05 | 2020-10-16 | 安徽江淮汽车集团股份有限公司 | Backlight protection circuit, device and automobile |
| CN114495845A (en) * | 2022-02-11 | 2022-05-13 | 芜湖宏景电子股份有限公司 | Two-stage brightness control circuit of vehicle-mounted sound equipment product |
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| CN201465520U (en) * | 2009-03-31 | 2010-05-12 | 慧明光电(深圳)有限公司 | Automatic brightness control device of vehicle-mounted multimedia display screen |
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2019
- 2019-12-05 CN CN201911234385.7A patent/CN111081192A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003098585A1 (en) * | 2002-05-14 | 2003-11-27 | United Parcel Service Of America, Inc. | Systems and methods for controlling brightness of an avionics display |
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| CN202796005U (en) * | 2012-08-03 | 2013-03-13 | 惠州市德赛西威汽车电子有限公司 | Automatically adjusted backlight circuit |
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| CN203840595U (en) * | 2014-03-26 | 2014-09-17 | 重庆徐港电子有限公司 | High-linearity large-dynamic light modulating circuit used for LED backlight source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111787657A (en) * | 2020-08-05 | 2020-10-16 | 安徽江淮汽车集团股份有限公司 | Backlight protection circuit, device and automobile |
| CN114495845A (en) * | 2022-02-11 | 2022-05-13 | 芜湖宏景电子股份有限公司 | Two-stage brightness control circuit of vehicle-mounted sound equipment product |
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Application publication date: 20200428 |