CN102963295A - Backlight circuit of automobile combination instrument and backlight automatic adjustment method thereof - Google Patents
Backlight circuit of automobile combination instrument and backlight automatic adjustment method thereof Download PDFInfo
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- CN102963295A CN102963295A CN2012104646273A CN201210464627A CN102963295A CN 102963295 A CN102963295 A CN 102963295A CN 2012104646273 A CN2012104646273 A CN 2012104646273A CN 201210464627 A CN201210464627 A CN 201210464627A CN 102963295 A CN102963295 A CN 102963295A
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- 239000003990 capacitor Substances 0.000 claims description 3
- 238000005286 illumination Methods 0.000 abstract description 3
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Abstract
The invention provides a backlight circuit of an automobile combination instrument and a backlight automatic adjustment method thereof, which are used for improving comfort and operation convenience of the an automobile and satisfying useful requirement of people. The backlight circuit of the automobile combination instrument in provided by the invention comprises a control unit and a backlight lamp unit connected with the control unit; and the key is that the control unit is connected with a light ray sensing unit. The backlight automatic adjustment method of the backlight circuit of the automobile combination instrument comprises the following steps: the control unit receives a light intensity signal of the light ray sensing unit; when the light intensity signal is lower than a predetermined value, the control unit controls the a backlight lamp to open and adjusts the brightness of the backlight lamp according to the light intensity signal; and the light intensity signal is in inverse relationship with the brightness of the backlight lamp. The backlight circuit of the automobile combination instrument in provided by the invention can realize to automatically opening of the combination instrument backlight and automatically adjustment of brightness according to the illumination intensity of the external environment, thereby improving the operation convenience and safety of drivers.
Description
Technical field
The invention belongs to technical field of automotive electronics, specially refer to a kind of backlight circuit and Automatic adjustment method backlight thereof of automobile combination meter.
Background technology
Along with the progress of technology and the development of automobile industry, people also have higher requirement to car comfort and operation ease aspect.
Because in the process of moving, chaufeur need to be faced various photoenvironment.For example pass through tunnel, cloudy day, night.Need in time light the backlight of combination instrument, and suitable backlight illumination is provided, both can guarantee that chaufeur can in time be seen and guarantee safe driving when the vehicle in front indication information, again can be because of backlight too not strong and dazzling.Common combination instrument is backlight two kinds of control programs.The first: it is backlight to need M/C backlight control switch just can light or close combination instrument.There is certain defect in this method: when driving environment dimmed suddenly, process of passing through tunnel for example, chaufeur is difficult to very fast unlatching back lighting switch, has driving safety hidden danger, operation ease is bad.The second: key rotates to the ON shelves, and combination instrument is backlight to be lighted automatically.Although it is backlight that this method can be opened combination instrument automatically, can't automatically regulate its brightness, perhaps brightness on daytime does not cause by force not seeing; Perhaps night backlight dazzling, uncomfortable, cause easily driving fatigue.Above two schemes all can't be realized automatic adjusting backlight, therefore is difficult to satisfy customer's operating needs.
Summary of the invention
The objective of the invention is to propose a kind of backlight circuit and Automatic adjustment method backlight thereof of automobile combination meter, to improve traveling comfort and the operation ease of automobile, satisfy people's user demand.
The backlight circuit of automobile combination meter of the present invention comprises control unit and the backlight unit that links to each other with control unit, and key is that described control unit is connected with a light sensing unit.
The Automatic adjustment method backlight of the backlight circuit of above-mentioned automobile combination meter is as follows: described control unit receives the light intensity signal of light sensing unit, when light intensity signal is lower than predetermined value, control unit control backlight is opened, and regulate the brightness of backlight and the brightness of described light intensity signal and the backlight relation of being inversely proportional to according to light intensity signal.
Further, described light sensing unit comprises the first constant voltage power suspply, the first resistance, photodiode, and an end of described photodiode links to each other other end ground connection by the first resistance with the first constant voltage power suspply; Described photodiode links to each other with control unit with the contact of the first resistance.The electric current that photodiode passes through is along with the variation of extraneous light changes, the voltage of the contact of photodiode and the first resistance also can change thereupon like this, and control unit is known extraneous light situation of change by the voltage of the contact of the photodiode that receives and the first resistance.The light sensing unit only is comprised of three elements, and cost is low and more reliable.
Further, be in series with the first current-limiting resistance between the contact of described photodiode and the first resistance and the control unit, excessive and cause control unit to damage to the electric current of control unit with the contact input that prevents photodiode and the first resistance.
Further, the contact of described the first current-limiting resistance and control unit is by the first divider resistance ground connection, and is excessive and cause the control unit damage to the voltage of control unit with the contact input that prevents photodiode and the first resistance.
Further, the contact of described the first current-limiting resistance and control unit is by filter capacitor ground connection, to reduce clutter to the interference of control unit incoming signal.
Further, described backlight unit comprises the second constant voltage power suspply, LED, NPN type aerotron, the second current-limiting resistance, the 3rd current-limiting resistance, the second divider resistance, one end of described the second current-limiting resistance links to each other with control unit, and the other end is by the second divider resistance ground connection; Described the second current-limiting resistance links to each other with the base stage of NPN type aerotron with the contact of the second divider resistance, and the collecting electrode of described NPN type aerotron links to each other the grounded emitter of described NPN type aerotron by the 3rd current-limiting resistance, LED successively with the second constant voltage power suspply.The control signal that control unit sends can be controlled break-make and the size of current of NPN type aerotron, thus the brightness of control LED.
The backlight circuit of automobile combination meter of the present invention can realize that combination instrument automatic unlatching backlight sends from moving brightness adjusting according to the external environment Illumination intensity, thereby has improved the operation ease of chaufeur, safety.
Description of drawings
Fig. 1 is the functional block diagram of the backlight circuit of automobile combination meter of the present invention.
Fig. 2 is the schematic circuit diagram of the backlight circuit of automobile combination meter of the present invention.
The specific embodiment
The below contrasts accompanying drawing, by the description to embodiment, the effect of the mutual alignment between the shape of the specific embodiment of the present invention such as related each member, structure, the each several part and annexation, each several part and principle of work etc. are described in further detail.
Embodiment 1:
As shown in Figure 1, the backlight circuit of the automobile combination meter of present embodiment comprises control unit and the backlight unit that links to each other with control unit, and key is that described control unit is connected with a light sensing unit.
The Automatic adjustment method backlight of the backlight circuit of above-mentioned automobile combination meter is as follows: described control unit receives the light intensity signal of light sensing unit, when light intensity signal is lower than predetermined value, control unit control backlight is opened, and regulate the brightness of backlight and the brightness of described light intensity signal and the backlight relation of being inversely proportional to according to light intensity signal.
As shown in Figure 2, described light sensing unit comprises the first constant voltage power suspply 12V, the first resistance R 1, photodiode D1, and the end of photodiode D1 links to each other other end ground connection by the first resistance R 1 with the first constant voltage power suspply 12V; Described photodiode D1 links to each other with control unit by the first current-limiting resistance R2 with the contact of the first resistance R 1; The contact of the first current-limiting resistance R2 and control unit is respectively by the first divider resistance R3, filter capacitor C1 ground connection.
The electric current that photodiode D1 passes through is along with the variation of extraneous light changes, the voltage of the contact of photodiode D1 and the first resistance R 1 also can change thereupon like this, and control unit is known extraneous light situation of change by the voltage of the contact of the photodiode D1 that receives and the first resistance R 1.
Backlight unit comprises the second constant voltage power suspply 12V, LED, NPN type aerotron Q1, the second current-limiting resistance R4, the 3rd current-limiting resistance R5, the second divider resistance R6, the end of described the second current-limiting resistance R4 links to each other with control unit, and the other end is by the second divider resistance R6 ground connection; Described the second current-limiting resistance R4 links to each other with the base stage of NPN type aerotron Q1 with the contact of the second divider resistance R6, the collecting electrode of described NPN type aerotron Q1 links to each other the grounded emitter of described NPN type aerotron Q1 by the 3rd current-limiting resistance R5, LED successively with the second constant voltage power suspply.The control signal that control unit sends can be controlled break-make and the size of current of NPN type aerotron Q1, thus the brightness of control LED.
Claims (7)
1. the backlight circuit of an automobile combination meter comprises control unit and the backlight unit that links to each other with control unit, it is characterized in that described control unit is connected with a light sensing unit.
2. the backlight circuit of automobile combination meter according to claim 1, it is characterized in that described light sensing unit comprises the first constant voltage power suspply, the first resistance, photodiode, one end of described photodiode links to each other other end ground connection by the first resistance with the first constant voltage power suspply; Described photodiode links to each other with control unit with the contact of the first resistance.
3. the backlight circuit of automobile combination meter according to claim 2 is characterized in that being in series with the first current-limiting resistance between the contact of described photodiode and the first resistance and the control unit.
4. the backlight circuit of automobile combination meter according to claim 3 is characterized in that the contact of described the first current-limiting resistance and control unit is by the first divider resistance ground connection.
5. according to claim 3 or the backlight circuit of 4 described automobile combination meters, it is characterized in that the contact of described the first current-limiting resistance and control unit is by filter capacitor ground connection.
6. the backlight circuit of automobile combination meter according to claim 1, it is characterized in that described backlight unit comprises the second constant voltage power suspply, LED, NPN type aerotron, the second current-limiting resistance, the 3rd current-limiting resistance, the second divider resistance, one end of described the second current-limiting resistance links to each other with control unit, and the other end is by the second divider resistance ground connection; Described the second current-limiting resistance links to each other with the base stage of NPN type aerotron with the contact of the second divider resistance, and the collecting electrode of described NPN type aerotron links to each other the grounded emitter of described NPN type aerotron by the 3rd current-limiting resistance, LED successively with the second constant voltage power suspply.
7. the Automatic adjustment method backlight of the backlight circuit of automobile combination meter according to claim 1, it is characterized in that described control unit receives the light intensity signal of light sensing unit, when light intensity signal is lower than predetermined value, control unit control backlight is opened, and regulate the brightness of backlight and the brightness of described light intensity signal and the backlight relation of being inversely proportional to according to light intensity signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210464627.3A CN102963295B (en) | 2012-11-19 | 2012-11-19 | A kind of backlight circuit of automobile combination meter and backlight Automatic adjustment method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210464627.3A CN102963295B (en) | 2012-11-19 | 2012-11-19 | A kind of backlight circuit of automobile combination meter and backlight Automatic adjustment method thereof |
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| CN102963295A true CN102963295A (en) | 2013-03-13 |
| CN102963295B CN102963295B (en) | 2016-01-13 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106314154A (en) * | 2016-08-31 | 2017-01-11 | 惠州华阳通用电子有限公司 | Instrument backlight control method and device |
| CN107084351A (en) * | 2016-02-15 | 2017-08-22 | 马自达汽车株式会社 | Vehicle lighting control device |
| CN109509438A (en) * | 2018-12-28 | 2019-03-22 | 惠科股份有限公司 | Backlight drive component, backlight module and display device |
| CN109637469A (en) * | 2019-02-20 | 2019-04-16 | 昆山弘锦威电子有限公司 | Backlight regulating circuit |
| CN112644281A (en) * | 2020-09-01 | 2021-04-13 | 江苏振宁半导体研究院有限公司 | Brightness display adjusting system and method for instrument panel |
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| CN201444710U (en) * | 2008-12-24 | 2010-04-28 | 成都泰宁科技有限公司 | Changeable background light control device arranged inside automobile combined meter |
| CN201685715U (en) * | 2010-05-31 | 2010-12-29 | 东风襄樊仪表系统有限公司 | Electronics combined instrument for vehicles |
| CN102231263A (en) * | 2011-07-11 | 2011-11-02 | 奇瑞汽车股份有限公司 | Automobile and system and method for regulating luminance of display screen |
| CN202088897U (en) * | 2011-01-04 | 2011-12-28 | 浙江吉利汽车研究院有限公司 | Combined instrument panel capable of automatically adjusting backlight |
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2012
- 2012-11-19 CN CN201210464627.3A patent/CN102963295B/en active Active
Patent Citations (5)
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| KR20040065878A (en) * | 2003-01-16 | 2004-07-23 | 현대모비스 주식회사 | Backlight device for vehicle |
| CN201444710U (en) * | 2008-12-24 | 2010-04-28 | 成都泰宁科技有限公司 | Changeable background light control device arranged inside automobile combined meter |
| CN201685715U (en) * | 2010-05-31 | 2010-12-29 | 东风襄樊仪表系统有限公司 | Electronics combined instrument for vehicles |
| CN202088897U (en) * | 2011-01-04 | 2011-12-28 | 浙江吉利汽车研究院有限公司 | Combined instrument panel capable of automatically adjusting backlight |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107084351A (en) * | 2016-02-15 | 2017-08-22 | 马自达汽车株式会社 | Vehicle lighting control device |
| CN106314154A (en) * | 2016-08-31 | 2017-01-11 | 惠州华阳通用电子有限公司 | Instrument backlight control method and device |
| CN106314154B (en) * | 2016-08-31 | 2019-01-01 | 惠州华阳通用电子有限公司 | A kind of instrument method for controlling backlight thereof and device |
| CN109509438A (en) * | 2018-12-28 | 2019-03-22 | 惠科股份有限公司 | Backlight drive component, backlight module and display device |
| CN109637469A (en) * | 2019-02-20 | 2019-04-16 | 昆山弘锦威电子有限公司 | Backlight regulating circuit |
| CN112644281A (en) * | 2020-09-01 | 2021-04-13 | 江苏振宁半导体研究院有限公司 | Brightness display adjusting system and method for instrument panel |
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| CN102963295B (en) | 2016-01-13 |
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