CN105845091B - A kind of backlight drive circuit and terminal device - Google Patents
A kind of backlight drive circuit and terminal device Download PDFInfo
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- CN105845091B CN105845091B CN201610402243.7A CN201610402243A CN105845091B CN 105845091 B CN105845091 B CN 105845091B CN 201610402243 A CN201610402243 A CN 201610402243A CN 105845091 B CN105845091 B CN 105845091B
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- 239000004973 liquid crystal related substance Substances 0.000 claims description 12
- 230000001960 triggered effect Effects 0.000 claims description 9
- 230000002457 bidirectional effect Effects 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 2
- 230000000977 initiatory effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 230000001052 transient effect Effects 0.000 abstract 2
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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
-
- 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
- G09G3/36—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 using liquid crystals
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The present invention provides a kind of backlight drive circuit and terminal device, and the backlight drive circuit includes：Drive circuit and control circuit；The drive circuit, is connected with back light, for providing driving current to the back light by electric current output pin；The control circuit on one side is connected with the electric current output pin of the drive circuit, and the other end is connected with the processor of the terminal device；The control circuit is used for the enabling signal of the transient flash for receiving the processor triggering, and the output current of the electric current output pin of the drive circuit is instantaneously improved according to the enabling signal.The embodiment of the present invention controls the size of driving current by increasing control circuit on the peripheral circuit of backlight drive circuit, uses high current to drive back lit light pipe so that LCM screens can act as transient flash and play a part of flash lamp, and lifting is taken pictures effect.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a backlight driving circuit and a terminal device.
Background
The smart phone has the advantages that the function of a front flash lamp is added to some smart phones in order to meet the photographing requirement in a dark environment, and the function of supplementing light for photographing by utilizing an LCM (liquid crystal display module) screen is rapidly applied along with the development of the technology.
When the front-mounted flash lamp is added into the smart phone, on one hand, the cost of the front-mounted flash lamp is increased, on the other hand, a light-transmitting window of the flash lamp needs to be increased, and the appearance of the smart phone is influenced in a certain procedure. However, the conventional LCM screen light supplement also faces some problems, because of the limitation of the LCM screen backlight driving IC (integrated circuit), large-current flash cannot be realized, so that the brightness of flash through the screen in a dark environment is insufficient, and the photographing effect is affected to a certain extent.
Disclosure of Invention
The invention aims to provide a backlight driving circuit and terminal equipment, which solve the problem of arrangement of a front flash lamp in the prior art.
In order to achieve the above object, an embodiment of the present invention provides a backlight driving circuit, which is applied to a terminal device, and the backlight driving circuit includes: a drive circuit and a control circuit;
the driving circuit is connected with the backlight light source and used for providing driving current for the backlight light source through the current output pin;
one end of the control circuit is connected with a current output pin of the drive circuit, and the other end of the control circuit is connected with a processor of the terminal equipment; the control circuit is used for receiving an instantaneous flashing starting signal triggered by the processor and instantaneously increasing the output current of the current output pin of the driving circuit according to the starting signal.
An embodiment of the present invention further provides a terminal device, including: the backlight module and the liquid crystal display panel further comprise the backlight driving circuit.
The technical scheme of the invention at least has the following beneficial effects:
in the backlight driving circuit and the terminal device provided by the embodiment of the invention, the control circuit is added on the peripheral circuit of the backlight driving circuit to control the magnitude of the driving current, and the large current is used for driving the backlight light tube, so that the LCM screen can be used as instantaneous flash to play a role of a flash lamp, and the photographing effect is improved.
Drawings
Fig. 1 is a schematic circuit diagram of a backlight driving circuit according to a first embodiment of the invention;
fig. 2 is a schematic diagram of a circuit structure of a control circuit in a backlight driving circuit according to a first embodiment of the invention;
fig. 3 is a waveform diagram of a driving current of a backlight driving circuit according to a first embodiment of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
First embodiment
As shown in fig. 1, a first embodiment of the present invention provides a backlight driving circuit applied to a terminal device, the backlight driving circuit including: a drive circuit 1 and a control circuit 2;
the driving circuit 1 is connected with the backlight light source and used for providing driving current for the backlight light source through a current output pin;
one end of the control circuit 2 is connected with a current output pin of the driving circuit, and the other end of the control circuit is connected with a processor of the terminal equipment; the control circuit is used for receiving a starting signal of instantaneous flashing triggered by the processor and instantaneously increasing the output current of a current output pin RT of the driving circuit according to the starting signal.
In the above embodiment of the present invention, a control circuit 2 is added at the current output pin RT of the backlight driving circuit, when the backlight driving circuit is used for normal display driving, the control circuit 2 does not work, the output current of the current output pin RT is a small current, and the small current can meet the screen brightness adjustment requirement of the backlight PCM screen; when the backlight driving current is used as the instantaneous flash, the control circuit 2 works, namely the control circuit 2 instantaneously increases the output current of the current output pin RT according to the starting signal of the instantaneous flash, at the moment, the output current of the current output pin RT is large current, and the striking current can meet the flash requirement at the moment of photographing; further, after the flash is finished, the control circuit 2 stops working, and the output current of the current output pin RT returns to the small current before adjustment.
Further, as shown in fig. 1 and 2, the control circuit 2 includes: a first resistor R306, a second resistor R307, and a switch circuit Q1; wherein,
a current output pin RT of the driving circuit is respectively connected to a first end of the first resistor R306 and a first end of the second resistor R307, a second end of the first resistor R306 is grounded, and a second end of the second resistor R307 is grounded after being connected in series with the switch circuit Q1;
the switch circuit Q1 receives the starting signal of the instantaneous flash triggered by the processor, the switch circuit is closed to enable the first resistor and the second resistor to be connected in parallel, and then the output current of the current output pin RT of the driving circuit is increased instantaneously.
In the above embodiment of the present invention, when the control circuit does not operate, the switching circuit Q1 is turned off, and the current-limiting resistor of the driving circuit is the first resistor R306; when the control circuit 2 receives the start signal of the flash, the control circuit 2 operates, the switch circuit Q1 is closed, and the current limiting resistor of the driving circuit is equal to the resistance value obtained by connecting the first resistor R306 in parallel with the second resistor R307. Compared with the control circuit which does not work, the current-limiting resistor of the control circuit which works is reduced, so that the output current of the current output pin RT is increased, and the purpose of instantaneous flashing can be achieved.
It should be noted that the specific resistance of the first resistor R306 and the specific resistance of the second resistor R307 can be set according to the normal brightness requirement and the flash brightness requirement, and are not limited to a specific value.
Specifically, as shown in fig. 2, the switching circuit Q1 in the above embodiment of the present invention includes: a bidirectional diode DIAC, a diode D302 and a transistor FET; wherein,
a second end of the second resistor R307 is connected to the drain of the transistor FET, a gate G of the transistor FET is connected to a source S of the transistor FET through the bidirectional diode DIAC, the source S of the transistor FET is connected to the anode of the diode D302, the cathode of the diode D302 is connected to the drain D of the transistor FET, the substrate of the transistor FET is grounded, and the gate G of the transistor FET is connected to a control signal input BL _ FLASH;
the switching circuit Q1 receives an instant FLASH start signal triggered by the processor, increases the input voltage of the control signal input terminal BL _ FLASH, turns on the source S and the drain D of the transistor, and turns on the switching circuit, so that the output current of the current output pin RT of the driving circuit 1 is instantly increased.
In the embodiment of the present invention, the transistor FET is used as a switch circuit, and the input voltage of the control signal input terminal BL _ FLASH is increased to control the conduction of the source S and the drain D of the transistor (i.e., the switch circuit is closed), so that the output current of the current output pin RT is instantaneously increased, thereby achieving the purpose of instantaneous FLASH. Under normal state, the source S and the drain D of the transistor are not conducted, that is, the switch circuit is turned off, and the output current of the current output pin RT is a small current, so that normal brightness adjustment of the screen is achieved.
Further, the input voltage of the control signal input terminal BL _ FLASH is increased to be at least greater than or equal to the turn-on voltage of the bidirectional diode DIAC and greater than or equal to the forward turn-on voltage of the diode D302, so that the source S and the drain D of the transistor can be turned on.
The bidirectional diode DIAC is used, among other things, for overvoltage protection of the control circuit 2. The RT pin of the backlight circuit is used to control the maximum current in the flash. When the transistor is used for normal backlight display driving, the FET tube is ensured to be in a closed state, when the transistor is used for instantaneous FLASH, the FET tube is opened, the BL _ FLASH pin controls the grid electrode of the FET tube, and the voltage of the BL _ FLASH is increased, so that the source electrode and the drain electrode of the FET are conducted, the aim of reducing the ground impedance of the RT pin is fulfilled, the impedance of the RT pin is reduced, and the FLASH current is increased, so that instantaneous high-current FLASH is realized. And when the FLASH is finished, the voltage of the BL _ FLASH is pulled down, so that the FLASH mode is exited, and the normal backlight display mode is entered. Fig. 3 shows a schematic diagram of the output current at the RT pin.
Further, in the foregoing embodiment of the present invention, the control circuit 2 further includes:
a third resistor R308 and a fourth resistor R309 connected between the gate G of the transistor FET and the control signal BL _ FLASH; wherein,
one end of the third resistor R308 is connected with the gate G of the transistor FET, and the other end of the third resistor R308 is connected with the control signal BL _ FLASH;
one end of the fourth resistor R309 is connected to the gate G of the transistor FET, and the other end of the fourth resistor R309 is grounded.
In the above embodiment of the present invention, the third resistor R308 and the fourth resistor R309 are protection resistors of the control circuit.
In summary, the working principle of the backlight driving circuit provided by the first embodiment of the invention is as follows: the backlight driving circuit plays two roles, namely, the normal backlight display and the instantaneous photographing flash. On the other hand, since the maximum flash current of the backlight circuit is determined by the resistance value of the RT pin of the backlight circuit, the flash current can be dynamically adjusted by changing the resistance value of the RT pin, and when the FET is turned on, the resistance value of the RT pin is reduced to achieve the purpose of increasing the flash current, and when the FET is turned off, the resistance value of the RT pin is increased to maintain the normal function of the backlight circuit for backlight display.
Second embodiment
In order to better achieve the above object, a second embodiment of the present invention provides a terminal device including: the backlight module and the liquid crystal display panel are characterized by further comprising the backlight driving circuit.
In the second embodiment of the invention, the control circuit is added on the basis of the existing backlight circuit, so that the demand of instantaneous heavy-current flashing when the liquid crystal display panel flashes is realized, the photographing effect in a dark environment is ensured, and meanwhile, the dimming effect of the liquid crystal display panel during normal backlight display is not influenced.
Specifically, the backlight driving circuit instantaneously increases the output current of the current output pin according to a received instantaneous flashing start signal triggered by a processor of the terminal device, and the brightness of the liquid crystal display panel is instantaneously increased to realize instantaneous flashing. Further, after the instant flash is finished, the output current of the current output pin of the backlight driving circuit is recovered to the output current before the instant flash.
In the above embodiment of the present invention, a control circuit is added at the current output pin of the backlight driving circuit, when the backlight driving circuit is used for normal display driving, the control circuit does not work, the output current of the current output pin is a small current, and the small current can meet the requirement of brightness adjustment of the backlight liquid crystal display panel; when the backlight driving current is used as the instantaneous flash, the control circuit works, namely the control circuit instantaneously improves the output current of the current output pin according to the starting signal of the instantaneous flash, the output current of the current output pin is large current at the moment, and the striking current can meet the flash requirement at the moment of photographing; further, after the flash is finished, the control circuit stops working, and the output current of the current output pin is recovered to be the small current before adjustment.
When the terminal provided by the second embodiment of the invention is used for taking a picture in a dark environment, the basic flow is as follows:
the user selects a camera which is not provided with a flash lamp but is arranged on the side of the liquid crystal display panel to take a picture;
at the moment when a user clicks a 'photographing key', a controller of the terminal equipment sends a starting signal of instantaneous flash to a control circuit when detecting that the current environment is dark and needs light supplement;
when the control circuit receives a starting signal of instantaneous flashing, the voltage value of a control signal BL _ FLASH is immediately pulled up, an FET tube is started, the output current of a current output pin RT is instantaneously increased, and the liquid crystal display panel realizes the instantaneous flashing of large current;
after the instant FLASH is finished, the control signal BL _ FLASH restores the original voltage value, the FET tube is closed, the output current of the current output pin RT restores the normal value, and then the liquid crystal display panel realizes the low-current backlight display.
The terminal device can be various portable electronic devices such as various mobile terminals, tablet computers and personal computers.
It should be noted that, the terminal device provided by the second embodiment of the present invention is a terminal device including the backlight driving circuit provided by the first embodiment, and all embodiments of the backlight driving circuit are applicable to the terminal device and can achieve the same or similar beneficial effects.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A backlight driving circuit applied to a terminal device is characterized by comprising: a drive circuit and a control circuit;
the driving circuit is connected with the backlight light source and used for providing driving current for the backlight light source through the current output pin;
one end of the control circuit is connected with a current output pin of the drive circuit, and the other end of the control circuit is connected with a processor of the terminal equipment; the control circuit is used for receiving a starting signal of instantaneous flash triggered by the processor and instantaneously increasing the output current of a current output pin of the driving circuit according to the starting signal;
wherein the control circuit comprises: a first resistor, a second resistor and a switch circuit; wherein,
a current output pin of the driving circuit is respectively connected with a first end of the first resistor and a first end of the second resistor, a second end of the first resistor is grounded, and a second end of the second resistor is grounded after being connected with the switching circuit in series;
the switch circuit receives an initiating signal of instantaneous flash triggered by the processor, and the switch circuit is closed to enable the first resistor and the second resistor to be connected in parallel;
wherein the switching circuit comprises: bidirectional diodes, diodes and transistors; wherein,
the second end of the second resistor is connected with the drain electrode of the transistor, the grid electrode of the transistor is connected with the source electrode of the transistor through the bidirectional diode, the source electrode of the transistor is connected with the anode of the diode, the cathode of the diode is connected with the drain electrode of the transistor, the substrate of the transistor is grounded, and the grid electrode of the transistor is also connected with a control signal input end;
the switching circuit receives a starting signal of the instantaneous flash triggered by the processor, the input voltage of the control signal input end is increased, the source electrode and the drain electrode of the transistor are conducted, and the switching circuit is closed.
2. The backlight driving circuit according to claim 1, wherein the input voltage of the control signal input terminal is increased to at least greater than or equal to a turn-on voltage of the bidirectional diode and greater than or equal to a forward turn-on voltage of the diode.
3. The backlight driver circuit of claim 2, wherein the control circuit further comprises:
a third resistor and a fourth resistor connected between the gate of the transistor and the control signal input terminal; wherein,
one end of the third resistor is connected with the grid electrode of the transistor, and the other end of the third resistor is connected with the control signal input end;
one end of the fourth resistor is connected with the grid electrode of the transistor, and the other end of the fourth resistor is grounded.
4. A terminal device, comprising: the backlight module and the liquid crystal display panel are characterized by further comprising the backlight driving circuit as claimed in any one of claims 1 to 3.
5. The terminal device as claimed in claim 4, wherein the backlight driving circuit instantaneously increases the output current of the current output pin according to a received start signal of instantaneous flashing triggered by a processor of the terminal device, and brightness of the liquid crystal display panel is instantaneously increased to realize instantaneous flashing.
6. The terminal device of claim 5, wherein after the flash is ended, the output current of the current output pin of the backlight driving circuit is restored to the output current before the flash.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610402243.7A CN105845091B (en) | 2016-06-08 | 2016-06-08 | A kind of backlight drive circuit and terminal device |
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| CN201610402243.7A CN105845091B (en) | 2016-06-08 | 2016-06-08 | A kind of backlight drive circuit and terminal device |
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| CN105845091B true CN105845091B (en) | 2017-06-23 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106373533A (en) * | 2016-11-23 | 2017-02-01 | 上海传英信息技术有限公司 | Backlight drive circuit and backlight drive current adjustment method |
| WO2018103253A1 (en) * | 2016-12-09 | 2018-06-14 | 华为技术有限公司 | Mobile device, backlight control method thereof, and flash calibration method and apparatus thereof |
| CN108366452B (en) * | 2018-02-11 | 2019-11-26 | 清华四川能源互联网研究院 | A kind of LED drive circuit single wire control method, system and storage equipment |
| CN108490716A (en) * | 2018-03-21 | 2018-09-04 | 上海艾为电子技术股份有限公司 | A kind of screen light filling circuit and electronic equipment |
| CN112804790B (en) * | 2019-11-13 | 2023-03-24 | 圣邦微电子（北京）股份有限公司 | LED drive circuit and control circuit thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201622822U (en) * | 2009-06-22 | 2010-11-03 | 比亚迪股份有限公司 | Backlight regulating circuit |
| CN103220421A (en) * | 2013-04-03 | 2013-07-24 | 广东欧珀移动通信有限公司 | Method and device for using mobile terminal to carry out self photographing |
| CN104185340A (en) * | 2013-05-28 | 2014-12-03 | 深圳富泰宏精密工业有限公司 | Flashlight brightness control circuit and portable terminal |
| CN104301475A (en) * | 2013-07-17 | 2015-01-21 | 联芯科技有限公司 | Mobile terminal provided with functions of flash lamp and electric torch |
| CN105516580A (en) * | 2014-10-15 | 2016-04-20 | 中兴通讯股份有限公司 | Method for using preposition camera head of terminal to shoot and terminal |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203376377U (en) * | 2013-08-15 | 2014-01-01 | 厦门市百岗电气有限公司 | LED display circuit switch of live display |
-
2016
- 2016-06-08 CN CN201610402243.7A patent/CN105845091B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201622822U (en) * | 2009-06-22 | 2010-11-03 | 比亚迪股份有限公司 | Backlight regulating circuit |
| CN103220421A (en) * | 2013-04-03 | 2013-07-24 | 广东欧珀移动通信有限公司 | Method and device for using mobile terminal to carry out self photographing |
| CN104185340A (en) * | 2013-05-28 | 2014-12-03 | 深圳富泰宏精密工业有限公司 | Flashlight brightness control circuit and portable terminal |
| CN104301475A (en) * | 2013-07-17 | 2015-01-21 | 联芯科技有限公司 | Mobile terminal provided with functions of flash lamp and electric torch |
| CN105516580A (en) * | 2014-10-15 | 2016-04-20 | 中兴通讯股份有限公司 | Method for using preposition camera head of terminal to shoot and terminal |
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| CN105845091A (en) | 2016-08-10 |
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