CN2457695Y - Poor light power saving detection controller of hand held equipment - Google Patents
Poor light power saving detection controller of hand held equipment Download PDFInfo
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- CN2457695Y CN2457695Y CN 00266000 CN00266000U CN2457695Y CN 2457695 Y CN2457695 Y CN 2457695Y CN 00266000 CN00266000 CN 00266000 CN 00266000 U CN00266000 U CN 00266000U CN 2457695 Y CN2457695 Y CN 2457695Y
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Abstract
The utility model discloses a background light power-saving control device, which can automatically detect the ambient light condition. The utility model switches on or switches off a liquid crystal displaying screen of a hand-held device and the keyboard background light function. The utility model has the advantage of simple structure. The utility model only needs to add a photosensitive control branch circuit into a control circuit of a common hand-held device, the output terminal of a photosensitive detecting element in the branch circuit is connected with the input terminal of a comparator, and the output terminal of the comparator is connected with the input terminal of a background light control circuit. The utility model has the functions that the utility model reduces the complete machine power consumption of the hand-held device, reduces the number of battery charge times, prolongs the service time of the utility model, and brings convenience for users.
Description
The utility model relates to a kind of photosensitive control device, particularly relates to a kind of photosensitive control device that is used for handheld device.
In recent years, gradually risen the handheld device of a class band LCDs on the market, for example mobile phone, hand-held POS machine, IC-card read write line and palm PC etc., because this kind equipment is multiple functional, easy to carry, therefore just popular once occurring on market, and popularity rate is the trend that increases year by year.In order clearly to discern information shown on the LCDs and the button on the keyboard under the relatively poor environment of light, this kind equipment generally all has for display screen and keyboard provides function backlight.Can being used to provide device backlight, to mainly contain light emitting diode (LED), electroluminescent cell (EL), condensation utmost point luminotron (CCFL) etc. several.The advantage of light emitting diode is to use the life-span long, and shortcoming is generally to need a plurality of light emitting diodes to provide backlight, power consumption big (power consumption can reach hundreds of milliamperes usually).The advantage of electroluminescence backlight is low in energy consumption, and shortcoming is to use the life-span shorter.Therefore, at present handheld device generally adopts light emitting diode, electroluminescent cell hybrid backlight, in the hope of utilizing both advantages, and avoids shortcoming separately.However, because general handheld device no matter be under what ambient lighting condition, as long as open once the backlight of its LCDs of start and keyboard thereupon, is not only wasted the energy of handheld device preciousness, and can shorten life-span of backlight, reduce the reliability of complete machine.
The purpose of this utility model provides a kind of suffered illumination condition of handheld device that detects, and open or close economize on electricity detection control apparatus backlight backlight according to actual needs automatically, to reduce the power consumption of handheld device, reduce the charging times of battery, prolong its service time, for the user brings convenience.
For achieving the above object, the technical solution adopted in the utility model is: in the backlight control circuit of common handheld device LCDs and keyboard, increase a photosensitive detection branches circuit, this photosensitive detection branches circuit is by a photosensitive detection device to daylight and light sensitivity, a comparer and some bias resistors are formed, wherein the sensitive area of photosensitive detection device is exposed under the ambient light, the output terminal of photosensitive detection device links to each other with the input end of comparer, the output terminal of comparer links to each other with the input end of the backlight control circuit of handheld device LCDs and keyboard, and then is controlling backlight opening and shutting off.
The course of work of the utility model economize on electricity detection control apparatus backlight is: when the sensitive area of photosensitive detection device is subjected to the irradiation of ambient light, just can produce the strong and weak directly proportional voltage signal of a size and ambient light at its output terminal, this signal is imported into the input end of comparer and compares with the threshold voltage of predefined comparer, when ambient light strong (LCDs of handheld device and keyboard do not need backlight), the voltage signal of photosensitive detection device output by with the threshold voltage of comparer relatively after, comparer just can be exported a suitable level signal, this level signal is admitted to the input end of backlight control circuit, make shutoff backlight, LCDs and keyboard be display backlight not; And when ambient light weak (LCDs of handheld device and keyboard need backlight), the voltage signal of photosensitive detection device output by with the threshold voltage of comparer relatively after, comparer also can be exported a suitable level signal, this level signal is admitted to the input end of backlight control circuit, make backlight open, LCDs and keyboard display backlight.
Compare with common handheld device, the advantage of the utility model handheld device economize on electricity detection control apparatus backlight is: it can control backlight opening and shutting off according to the power of ambient light, when ambient light is strong, backlight switch is in off state, and the backlight of LCDs and keyboard extinguished; And when ambient light was more weak, backlight switch then was in opening, backlight being unlocked on LCDs and the keyboard.Consequently reduced the unnecessary backlight open time, reduced the Overall Power Consumption of handheld device, prolonged the serviceable life of battery effectively, also prolonged the serviceable life of backlight simultaneously, improved whole aircraft reliability, and helped environmental protection.
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:
Fig. 1 is the profile synoptic diagram of the handheld device of the utility model economize on electricity detection control apparatus backlight;
Fig. 2 is the circuit diagram of first kind of embodiment of the utility model handheld device economize on electricity detection control apparatus backlight;
Fig. 3 is the circuit diagram of second kind of embodiment of the utility model handheld device economize on electricity detection control apparatus backlight;
Fig. 4 is the circuit diagram of the third embodiment of the utility model handheld device economize on electricity detection control apparatus backlight;
Fig. 5 is the circuit diagram of the 4th kind of embodiment of the utility model handheld device economize on electricity detection control apparatus backlight.
In the profile synoptic diagram of the handheld device that has economize on electricity detection control apparatus backlight shown in Figure 1, what photosensitive detection device adopted is a phototriode 1, this phototriode 1, the keyboard 3 that has the LCDs 2 of backlight function and have a backlight function are installed on the panel of handheld device, and the sensitive area of phototriode 1 is exposed under the ambient light.
In Fig. 2, the emitter of phototriode 1 links to each other with an end of resistance 4, the other end ground connection of resistance 4, the collector of phototriode 1 links to each other with the positive pole of power supply, the emitter of phototriode 1 also links to each other with the anode of the input end of comparer 7, the base stage of phototriode 1 (being sensitive area) is exposed under the ambient light, resistance 5 and resistance 6 series connection, both contacts link to each other with the negative terminal of the input end of comparer 7, the other end of resistance 5 links to each other with the positive pole of power supply, the other end ground connection of resistance 6, and the output terminal of comparer 7 links to each other with an end of resistance 8, the other end of resistance 8 links to each other with the positive pole of power supply, and the output terminal of comparer 7 also links to each other with backlight control circuit.
When the base stage of phototriode 1 is subjected to the irradiation of ambient light, just can produce the voltage signal that a size is directly proportional with the power of ambient light at its emitter, this voltage signal be imported into comparer 7 input end anode and compare with the threshold voltage of predefined comparer, when ambient light strong (LCDs 2 and the keyboard 3 of handheld device do not need backlight), the voltage signal of the emitter of phototriode 1 output is during greater than the threshold voltage of comparer 7, comparer 7 can be exported a high level signal, this high level signal is admitted to the input end of backlight control circuit, backlight switch is turn-offed, and LCDs 2 and keyboard 3 be display backlight not; And when ambient light weak (LCDs 2 of handheld device and keyboard 3 need backlight), the voltage signal of the emitter of phototriode 1 output is during less than the threshold voltage of comparer 7, comparer 7 can be exported a low level signal, this low level signal is admitted to the input end of backlight control circuit, make backlight switch open LCDs 2 and keyboard 3 display backlights at last.
In Fig. 3, the collector of phototriode 1 links to each other with an end of resistance 9, the other end of resistance 9 links to each other with the positive pole of power supply, the grounded emitter of phototriode 1, the collector of phototriode 1 also links to each other with the negative terminal of the input end of comparer 7, the base stage of phototriode 1 (being sensitive area) is exposed under the ambient light, resistance 5 and resistance 6 series connection, both contacts link to each other with the anode of the input end of comparer 7, the other end of resistance 5 links to each other with the positive pole of power supply, the other end ground connection of resistance 6, and the output terminal of comparer 7 links to each other with an end of resistance 8, the other end of resistance 8 links to each other with the positive pole of power supply, and the output terminal of comparer 7 also links to each other with backlight control circuit.
When the base stage of phototriode 1 is subjected to the irradiation of ambient light, just can produce the voltage signal that the power of a size and ambient light is inversely proportional at its collector, this voltage signal be imported into comparer 7 input end negative terminal and compare with the threshold voltage of predefined comparer, when ambient light strong (LCDs 2 and the keyboard 3 of handheld device do not need backlight), the voltage signal of the collector of phototriode 1 output is during less than the threshold voltage of comparer 7, comparer 7 can be exported a high level signal, this high level signal is admitted to the input end of backlight control circuit, backlight switch is turn-offed, and LCDs 2 and keyboard 3 be display backlight not; And when ambient light weak (LCDs 2 of handheld device and keyboard 3 need backlight), the voltage signal of the collector of phototriode 1 output is during greater than the threshold voltage of comparer 7, comparer 7 can be exported a low level signal, this low level signal is admitted to the input end of backlight control circuit, make backlight switch open LCDs 2 and keyboard 3 display backlights at last.
In Fig. 4, the collector of phototriode 1 links to each other with an end of resistance 9, the other end of resistance 9 links to each other with the positive pole of power supply, the grounded emitter of phototriode 1, the collector of phototriode 1 also links to each other with the anode of the input end of comparer 7, the base stage of phototriode 1 (being sensitive area) is exposed under the ambient light, resistance 5 and resistance 6 series connection, both contacts link to each other with the negative terminal of the input end of comparer 7, the other end of resistance 5 links to each other with the positive pole of power supply, the other end ground connection of resistance 6, and the output terminal of comparer 7 links to each other with an end of resistance 8, the other end of resistance 8 links to each other with the positive pole of power supply, and the output terminal of comparer 7 also links to each other with backlight control circuit.
When the base stage of phototriode 1 is subjected to the irradiation of ambient light, just can produce the voltage signal that the power of a size and ambient light is inversely proportional at its collector, this voltage signal be imported into comparer 7 input end anode and compare with the threshold voltage of predefined comparer, when ambient light strong (LCDs 2 and the keyboard 3 of handheld device do not need backlight), the voltage signal of the collector of phototriode 1 output is during less than the threshold voltage of comparer 7, comparer 7 can be exported a low level signal, this low level signal is admitted to the input end of backlight control circuit, backlight switch is turn-offed, and LCDs 2 and keyboard 3 be display backlight not; And when ambient light weak (LCDs 2 of handheld device and keyboard 3 need backlight), the voltage signal of the collector of phototriode 1 output is during greater than the threshold voltage of comparer 7, comparer 7 can be exported a high level signal, this high level signal is admitted to the input end of backlight control circuit, make backlight switch open LCDs 2 and keyboard 3 display backlights at last.
In Fig. 5, the emitter of phototriode 1 links to each other with an end of resistance 4, the other end ground connection of resistance 4, the collector of phototriode 1 links to each other with the positive pole of power supply, the emitter of phototriode 1 also links to each other with the negative terminal of the input end of comparer 7, the base stage of phototriode 1 (being sensitive area) is exposed under the ambient light, resistance 5 and resistance 6 series connection, both contacts link to each other with the anode of the input end of comparer 7, the other end of resistance 5 links to each other with the positive pole of power supply, the other end ground connection of resistance 6, and the output terminal of comparer 7 links to each other with an end of resistance 8, the other end of resistance 8 links to each other with the positive pole of power supply, and the output terminal of comparer 7 also links to each other with backlight control circuit.
When the base stage of phototriode 1 is subjected to the irradiation of ambient light, just can produce the voltage signal that a size is directly proportional with the power of ambient light at its emitter, this voltage signal be imported into comparer 7 input end negative terminal and compare with the threshold voltage of predefined comparer, when ambient light strong (LCDs 2 and the keyboard 3 of handheld device do not need backlight), the voltage signal of the emitter of phototriode 1 output is during greater than the threshold voltage of comparer 7, comparer 7 can be exported a low level signal, this low level signal is admitted to the input end of backlight control circuit, backlight switch is turn-offed, and LCDs 2 and keyboard 3 be display backlight not; And when ambient light weak (LCDs 2 of handheld device and keyboard 3 need backlight), the voltage signal of the emitter of phototriode 1 output is during less than the threshold voltage of comparer 7, comparer 7 can be exported a high level signal, this high level signal is admitted to the input end of backlight control circuit, make backlight switch open LCDs 2 and keyboard 3 display backlights at last.
Claims (6)
1. handheld device economize on electricity detection control apparatus backlight, comprise the LCDs that has backlight function, the keyboard and the backlight control circuit system thereof that have backlight function, it is characterized in that: in its backlight control circuit system, also comprise a photosensitive detection branches circuit, this photosensitive detection branches circuit is by a photosensitive detection device (1), a comparer (7) and some bias resistors are formed, wherein the sensitive area of photosensitive detection device (1) is exposed under the ambient light, the output terminal of photosensitive detection device (1) links to each other with the input end of comparer (7), the output terminal of comparer (7) links to each other with the input end of backlight control circuit, is controlling backlight opening and shutting off.
2. handheld device according to claim 1 economize on electricity detection control apparatus backlight is characterized in that: described photosensitive detection branches circuit comprises phototriode (1), resistance (4), comparer (7), resistance (5), resistance (6) and resistance (8); The emitter of phototriode (1) links to each other with an end of resistance (4), the other end ground connection of resistance (4), the collector of phototriode (1) links to each other with the positive pole of power supply, the emitter of phototriode (1) also links to each other with the anode of the input end of comparer (7), the base stage of phototriode (1) (being sensitive area) is exposed under the ambient light, resistance (5) and resistance (6) series connection, both contacts link to each other with the negative terminal of the input end of comparer (7), the other end of resistance (5) links to each other with the positive pole of power supply, the other end ground connection of resistance (6), the output terminal of comparer (7) links to each other with an end of resistance (8), the other end of resistance (8) links to each other with the positive pole of power supply, and the output terminal of comparer (7) also links to each other with backlight control circuit.
3. handheld device according to claim 1 economize on electricity detection control apparatus backlight is characterized in that: described photosensitive detection branches circuit comprises phototriode (1), resistance (9), comparer (7), resistance (5), resistance (6) and resistance (8); The collector of phototriode (1) links to each other with an end of resistance (9), the other end of resistance (9) links to each other with the positive pole of power supply, the grounded emitter of phototriode (1), the collector of phototriode (1) also links to each other with the negative terminal of the input end of comparer (7), the base stage of phototriode (1) (being sensitive area) is exposed under the ambient light, resistance (5) and resistance (6) series connection, both contacts link to each other with the anode of the input end of comparer (7), the other end of resistance (5) links to each other with the positive pole of power supply, the other end ground connection of resistance (6), the output terminal of comparer (7) links to each other with an end of resistance (8), the other end of resistance (8) links to each other with the positive pole of power supply, and the output terminal of comparer (7) also links to each other with backlight control circuit.
4. handheld device according to claim 1 economize on electricity detection control apparatus backlight is characterized in that: described photosensitive detection branches circuit comprises phototriode (1), resistance (9), comparer (7), resistance (5), resistance (6) and resistance (8); The collector of phototriode (1) links to each other with an end of resistance (9), the other end of resistance (9) links to each other with the positive pole of power supply, the grounded emitter of phototriode (1), the collector of phototriode (1) also links to each other with the anode of the input end of comparer (7), the base stage of phototriode (1) (being sensitive area) is exposed under the ambient light, resistance (5) and resistance (6) series connection, both contacts link to each other with the negative terminal of the input end of comparer (7), the other end of resistance (5) links to each other with the positive pole of power supply, the other end ground connection of resistance (6), the output terminal of comparer (7) links to each other with an end of resistance (8), the other end of resistance (8) links to each other with the positive pole of power supply, and the output terminal of comparer (7) also links to each other with backlight control circuit.
5. handheld device according to claim 1 economize on electricity detection control apparatus backlight is characterized in that: described photosensitive detection branches circuit comprises phototriode (1), resistance (9), comparer (7), resistance (5), resistance (6) and resistance (8); The emitter of phototriode (1) links to each other with an end of resistance (4), the other end ground connection of resistance (4), the collector of phototriode (1) links to each other with the positive pole of power supply, the emitter of phototriode (1) also links to each other with the negative terminal of the input end of comparer (7), the base stage of phototriode (1) (being sensitive area) is exposed under the ambient light, resistance (5) and resistance (6) series connection, both contacts link to each other with the anode of the input end of comparer (7), the other end of resistance (5) links to each other with the positive pole of power supply, the other end ground connection of resistance (6), the output terminal of comparer (7) links to each other with an end of resistance (8), the other end of resistance (8) links to each other with the positive pole of power supply, and the output terminal of comparer (7) also links to each other with backlight control circuit.
6. handheld device according to claim 1 economize on electricity detection control apparatus backlight, it is characterized in that: described phototriode (1), LCDs (2) and keyboard (3) all are installed on the panel of handheld device, and the sensitive area of phototriode (1) is exposed under the ambient light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00266000 CN2457695Y (en) | 2000-12-27 | 2000-12-27 | Poor light power saving detection controller of hand held equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00266000 CN2457695Y (en) | 2000-12-27 | 2000-12-27 | Poor light power saving detection controller of hand held equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2457695Y true CN2457695Y (en) | 2001-10-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00266000 Expired - Fee Related CN2457695Y (en) | 2000-12-27 | 2000-12-27 | Poor light power saving detection controller of hand held equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2457695Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100395595C (en) * | 2005-09-20 | 2008-06-18 | 南京Lg新港显示有限公司 | Electricity-saving device for liquid crystal display and method thereof |
| CN101610300B (en) * | 2009-06-16 | 2012-07-04 | 中兴通讯股份有限公司 | Method and device for controlling backlight of mobile terminal |
-
2000
- 2000-12-27 CN CN 00266000 patent/CN2457695Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100395595C (en) * | 2005-09-20 | 2008-06-18 | 南京Lg新港显示有限公司 | Electricity-saving device for liquid crystal display and method thereof |
| CN101610300B (en) * | 2009-06-16 | 2012-07-04 | 中兴通讯股份有限公司 | Method and device for controlling backlight of mobile terminal |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |