CN2817238Y - Mobile phone backlight power-saving device - Google Patents
Mobile phone backlight power-saving device Download PDFInfo
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- CN2817238Y CN2817238Y CN 200520062219 CN200520062219U CN2817238Y CN 2817238 Y CN2817238 Y CN 2817238Y CN 200520062219 CN200520062219 CN 200520062219 CN 200520062219 U CN200520062219 U CN 200520062219U CN 2817238 Y CN2817238 Y CN 2817238Y
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- backlight
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- 230000003287 optical effect Effects 0.000 claims description 18
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 206010070834 Sensitisation Diseases 0.000 claims description 2
- 230000008313 sensitization Effects 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000001413 cellular effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
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- 230000002093 peripheral effect Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of communication, particularly a backlight power-saving device for a mobile phone, which comprises a microcontroller and a backlight lamp control circuit, wherein the backlight lamp control circuit can enable a control end to connect with common I/O openings of the microcontroller. The utility model also comprises a light sensor circuit, the input end of the light sensor circuit is connected to a power source and the output end of the light sensor circuit is connected to the analog input end of the microcontroller. The utility model is added with a light sensor circuit on the basis of the prior art so as to convert external strong light to electrical signals, the microcontroller checks a table according to the electrical signals and outputs corresponding control signals to control a backlight control chip so as to output different driving voltages to a backlight lamp. Therefore, the purpose of the different strength of a backlight lamp according to different environments is reached and the electric power consumption of a mobile phone on backlight modules is saved.
Description
[technical field]
The utility model relates to communication technical field, particularly a kind of mobile phone battery saving arrangement backlight.
[background technology]
At present, all be provided with backlight on LCD that mobile phone is used and the keyboard region, its purpose is to allow the user when using mobile phone under the more weak situation of light, provides with light source, makes the user still can normally use phone.Generally speaking, the control method that backlight is commonly used is: at the beginning, backlight is ready and does not light, when user's start, button, renovate or when incoming call was arranged, the backlight circuit entered illuminating state with regard to being triggered.System judges whether the user operates mobile phone after backlight is lighted a period of time, if judge that the user does not operate mobile phone, then backlight is extinguished, and enters armed state.
This method is very simple, allows the user be clear that the information that mobile phone is shown in the low environment of brightness.But the defective of this mobile phone is the comparison power consumption: the backlight circuit is no matter be in the more intense place of light, still in the more weak place of light all with same brightness light yellow.In fact, under many circumstances, backlight does not need so bright, even does not need backlight under the situation about having, and this is undoubtedly a significant deficiency the mobile phone that requires low power consumption now.In case power shortage, mobile phone will shut down immediately, can't continue communication again, like this, may cause the user to miss many important phones or information, influences user's use.
[summary of the invention]
The purpose of this utility model is to provide a kind of mobile phone battery saving arrangement that can regulate brightness of backlight according to surrounding environment.
The technical scheme that its technical problem that solves the utility model adopts is: mobile phone battery saving arrangement backlight, comprise microcontroller and backlight lamp control circuit, and the control end that enables of backlight lamp control circuit links to each other with the universaling I/O port of microcontroller; Also comprise optical sensor circuit, it imports termination power, the analog input end of its output termination microcontroller.
Described optical sensor circuit comprises optical sensor and resistance, the input termination power of optical sensor, first analog input end of its output termination microcontroller, an end of connecting resistance simultaneously; Second analog input end of another termination microcontroller of resistance.
The backlight lamp control circuit comprises backlight control chip and backlight, and described backlight adopts the common cathode connection to link to each other with the backlight control chip.
Described optical sensor is sensitization triode, silicon photocell, photo resistance, photodiode, phototransistor or photoelectric tube.
The utility model is by on the basis of existing technology, increase an optical sensor circuit, extraneous light intensity is converted to the signal of telecommunication, microcontroller is tabled look-up according to this signal of telecommunication, output control signal corresponding control backlight control chip, make the different driving voltage of its output to backlight, reach with the different purpose of the different backlight intensity of environment.Saved the power consumption of mobile phone on backlight module greatly.
[description of drawings]
Fig. 1 is the circuit structure diagram of the utility model mobile phone battery saving arrangement backlight.
Fig. 2 is a workflow diagram of the present utility model.
[embodiment]
With specific embodiment the utility model is further elaborated with reference to the accompanying drawings below.
As shown in Figure 1, mobile phone battery saving arrangement backlight comprises microcontroller MCU, backlight lamp control circuit 1 and optical sensor circuit 2.Optical sensor circuit 2 comprises optical sensor D1 and resistance R, optical sensor D1 is arranged at mobile phone outer surface one and is difficult for covered position, its input termination power vd D, the first analog input end A_IN of its output termination microcontroller, its output is the end of connecting resistance R simultaneously.In the utility model is preferable, optical sensor D1 selects the BCS series of products of TDK for use, Visible Radiant OpticalSensor, can also the usability optical transistor, a kind of in silicon photocell, photo resistance, photodiode, phototransistor or the photoelectric tube, but because the difference of device, its auxiliary peripheral circuit need be made corresponding modification according to the actual selection situation, because this technology belongs to known technology, does not carry out auspicious stating at this.The second analog input end A_REF of another termination microcontroller of resistance R.Backlight lamp control circuit 1 comprises backlight control chip U1 and backlight LED.The optional type of backlight control chip U1 is many, as AAT3113, AAT3120 etc., it enables control end and links to each other with the universaling I/O port of microcontroller MCU, control mode is: 0,1 digit pulse control mode---the output of every if desired road 20mA electric current, then defining high level is 10uS, only need send the rising edge pulse of 8 10us and then draw high level just can lock output current maintenance Chang Liang greater than 500us; Backlightly go out or circulate again brightly if make, only need drag down level and send pulse get final product again, need how many electric currents to export just to send corresponding pulse number to enter and then draw high level and get final product greater than 500uS greater than 500us.For the chip of different company, its control mode is all inequality, and is such as using I2C to control in addition, similar.Backlight LED adopts the common cathode connection to link to each other with backlight control chip U1.Among Fig. 1, the capacitor C 1 and the C2 that are connected on the backlight control chip U1 are used to boost: the input voltage of this class chip is generally 2.7V to 5.5V, and cell voltage is directly used in general selection in the circuit.But cell voltage is along with changing service time and reducing, and (driving voltage of backlight need boost generally 3.6～4.5V) for the voltage that guarantees to export can drive backlight.Capacitor C 3 and C4 are used to import filtering.
After the user is arranged on automatic adjustment pattern backlight with mobile phone, microcontroller MCU will judge the input of its analog input port A_IN, A_REF.Optical sensor D1 produces the electric current of respective strengths according to the luminous intensity of external environment, and electric current produces different pressure drops by precision resistance R4, is input to analog input port A_IN, the A_REF of microcontroller MCU.The A/D converter (analog/digital converter) of microcontroller MCU inside becomes digital signal with detected analog signal conversion.Microcontroller MCU tabled look-up according to this digital signal the backlight illumination parameter is set, and short time delay time is set, such as 3 seconds.For different display screens, the corresponding relation of environmental light intensity and backlight drive signal size is different: for the lcd screen of reflection-type, under fine sunlight, even at the strong indoor backlight that do not need out of light, therefore can driving current value be set to 0, promptly do not open backlight, and in the more dim place of light, what drive current need be provided with is bigger, at almost completely dark place, the contrast effect of consideration, do not need on the contrary with drive current be provided with very big, like this, along with weakening of extraneous light intensity, drive current is parabolic shape.LCD screen for full-transparency type needs the more intense content of just seeing clearly easily on the screen backlight, therefore when extraneous light is very strong, needs bigger drive current; In the more dim place of light, get final product with general drive current; Consider contrast effect equally, in very dark place, need less drive current, therefore, along with weakening of extraneous light intensity, drive current reduces gradually, and is as shown in the table.For the LCD screen of half-reflection and half-transmission type, can be again according to test effect
The following table data are carried out corresponding modification:
| Like environment is described | Light intensity (Lux) | Sensor current (uA) | The critical point of selecting | Driving current value during general mode bright entirely (half is bright) backlight | The backlight driving current value |
| Under the fine sunlight direct projection | 100000 | 6000～10000 | 6mA | 20mA*4(5mA*4) | 20mA*4 |
| Fine outdoor shady spot | 10000 | 600～1000 | 0.6mA | 20mA*4(5mA*4) | 15mA*4 |
| Fine indoor | 1000 | 60～100 | 60uA | 20mA*4(5mA*4) | 10mA*4 |
| Cloudy day is outdoor | 100 | 6～10 | 6uA | 20mA*4(5mA*4) | 10mA*4 |
| Cloudy day is indoor | 50 | 3～5 | 3uA | 20mA*4(5mA*4) | 10mA*4 |
| At dusk | 10 | 0.5～1 | 0.5uA | 20mA*4(5mA*4) | 10mA*4 |
| Moonlit night | 0.3 | ＜0.1 | 0.1uA | 20mA*4(5mA*4) | 5mA*4 |
| Night | 0.02 | ＜0.01 | 0.01uA | 20mA*4(5mA*4) | 5mA*4 |
When cellular phone flip is opened, or incoming call ring or keyboard press when pressing, and backlight LED opens, and backlight control chip U1 output corresponding driving signal makes it to send corresponding brightness to backlight LED.(3 second) opened a period of time by system at backlight after, when can judge the user automatically mobile phone is being operated, if do not have, then backlight LED is extinguished, enter the backlight armed state, if the user operates, continue to keep the backlight illuminating state, whether carry out operation judges after waiting for 3 seconds again.Flow chart as shown in Figure 2.
Claims (4)
1, mobile phone battery saving arrangement backlight comprises microcontroller (MCU) and backlight lamp control circuit (1), and the control end that enables of backlight lamp control circuit (1) links to each other with the universaling I/O port of microcontroller (MCU); It is characterized in that: also comprise optical sensor circuit (2), it imports termination power (VDD), the analog input end of its output termination microcontroller (MCU).
2, mobile phone according to claim 1 battery saving arrangement backlight, it is characterized in that: described optical sensor circuit (2) comprises optical sensor (D1) and resistance (R), the input termination power (VDD) of optical sensor (D1), first analog input end (A_IN) of its output termination microcontroller (MCU), an end of connecting resistance (R) simultaneously; Second analog input end (A_REF) of another termination microcontroller (MCU) of resistance (R).
3, mobile phone according to claim 1 battery saving arrangement backlight, it is characterized in that: backlight lamp control circuit (1) comprises backlight control chip (U1) and backlight (LED), and described backlight (LED) adopts the common cathode connection to link to each other with backlight control chip (U1).
4, mobile phone according to claim 2 battery saving arrangement backlight is characterized in that: described optical sensor (D1) is sensitization triode, silicon photocell, photo resistance, photodiode, phototransistor or photoelectric tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520062219 CN2817238Y (en) | 2005-07-29 | 2005-07-29 | Mobile phone backlight power-saving device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520062219 CN2817238Y (en) | 2005-07-29 | 2005-07-29 | Mobile phone backlight power-saving device |
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| CN2817238Y true CN2817238Y (en) | 2006-09-13 |
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| CN 200520062219 Expired - Fee Related CN2817238Y (en) | 2005-07-29 | 2005-07-29 | Mobile phone backlight power-saving device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102143268A (en) * | 2011-04-07 | 2011-08-03 | 惠州Tcl移动通信有限公司 | Mobile phone |
| CN102158577A (en) * | 2011-02-21 | 2011-08-17 | 惠州Tcl移动通信有限公司 | Mobile phone |
| CN102854820A (en) * | 2012-08-30 | 2013-01-02 | 江苏永钢集团有限公司 | Molten iron scheduling handset based on zigbee technology |
| US8830216B2 (en) | 2009-01-21 | 2014-09-09 | Nec Corporation | Illuminance detection method, flip-type electronic device and program |
-
2005
- 2005-07-29 CN CN 200520062219 patent/CN2817238Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8830216B2 (en) | 2009-01-21 | 2014-09-09 | Nec Corporation | Illuminance detection method, flip-type electronic device and program |
| CN102292966B (en) * | 2009-01-21 | 2015-03-18 | 联想创新有限公司（香港) | Illumination detection method, flip-type electronic device |
| CN102158577A (en) * | 2011-02-21 | 2011-08-17 | 惠州Tcl移动通信有限公司 | Mobile phone |
| CN102158577B (en) * | 2011-02-21 | 2014-06-18 | 惠州Tcl移动通信有限公司 | Mobile phone |
| CN102143268A (en) * | 2011-04-07 | 2011-08-03 | 惠州Tcl移动通信有限公司 | Mobile phone |
| CN102143268B (en) * | 2011-04-07 | 2014-07-02 | 惠州Tcl移动通信有限公司 | Mobile phone |
| CN102854820A (en) * | 2012-08-30 | 2013-01-02 | 江苏永钢集团有限公司 | Molten iron scheduling handset based on zigbee technology |
| CN102854820B (en) * | 2012-08-30 | 2014-05-28 | 江苏永钢集团有限公司 | Molten iron scheduling handset based on zigbee technology |
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Granted publication date: 20060913 Termination date: 20110729 |