CN102933002A - Driving circuit, system and method with mobile terminal keyboard lamps - Google Patents
Driving circuit, system and method with mobile terminal keyboard lamps Download PDFInfo
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- CN102933002A CN102933002A CN2012104681949A CN201210468194A CN102933002A CN 102933002 A CN102933002 A CN 102933002A CN 2012104681949 A CN2012104681949 A CN 2012104681949A CN 201210468194 A CN201210468194 A CN 201210468194A CN 102933002 A CN102933002 A CN 102933002A
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Abstract
The invention discloses a driving circuit, a driving system and a driving method with mobile terminal keyboard lamps, which are used for solving the problem of different brightnesses of the keyboard lamps. The driving circuit comprises a constant-current power supply module and the keyboard lamps, wherein a current loop is formed by the constant-current power supply module and the keyboard lamps. In the invention, a constant current mode is adopted to drive the keyboard lamps, and thus, currents flowing through the keyboard lamps are constant so as not to cause different brightnesses of the keyboard lamps.
Description
Technical Field
The invention relates to the technical field of electronic products, in particular to a driving circuit, a system and a method of a keyboard lamp of a mobile terminal.
Background
At present, the keypad lamps on the mobile terminal are driven in a constant voltage manner, as shown in fig. 1, each keypad lamp 101 is respectively connected in series with a resistor 102 and then forms a corresponding circuit with a constant voltage power module 103. However, the general keyboard lamp is LED, and the LED has individual difference, so that the current flowing through each LED is not necessarily the same, and the brightness of the LED is related to the current flowing through the LED, thereby causing the brightness of the LED to be different. Also, the resistances in series with the LEDs may not be exactly the same, increasing the probability that the current flowing through each LED will be different, and possibly resulting in different brightness of the LEDs.
Therefore, the existing constant voltage driving mode of the keyboard lamp can cause different brightness of the keyboard lamp, and the use of the mobile terminal is influenced.
Disclosure of Invention
The invention provides a driving circuit, a system and a method of a keyboard lamp of a mobile terminal, which are used for solving the problem of different brightness of the keyboard lamp.
The invention provides a driving circuit of a mobile terminal keyboard lamp, which comprises: a constant current power supply module 202 and a keyboard lamp 201; wherein,
the constant current power supply module 202 and the keyboard lamp 201 form a current loop.
Therefore, the keyboard lamp is driven in a constant current mode, so that the current flowing through the keyboard lamp is consistent, and the brightness difference of the keyboard lamp cannot be caused.
The driving circuit of the present invention further includes: the backlight 203, the backlight 203 and the keyboard lamp 201 are connected in series and then form a current loop with the constant current power supply module 202.
Therefore, the backlight lamp and the keyboard lamp can adopt the same constant current power supply module for power supply, and the constant current power supply module for power supply is saved.
The constant current power supply module 202 is a backlight driving power supply.
Therefore, the mobile terminal does not need to additionally increase a constant current power supply module, and the used backlight driving power supply is adopted, so that the resources are saved.
Of course, the keyboard light is an LED light. Therefore, the keyboard lamp does not need special materials, the commonly used LED is enough, and resources are further saved.
The invention provides a driving system of a mobile terminal keyboard lamp, which comprises: a processor 100, a switching circuit 200, and the driving circuit 300; wherein,
the processor 100 is connected to the switch circuit 200, and configured to issue a switch indication command to the switch circuit 200;
the switch circuit 200 is connected to the processor 100 and the driving circuit 200, and configured to switch the constant current power supply module in the driving circuit 300 under the control of the switch indication command, so that the keyboard lamp in the driving circuit 300 is turned on or turned off.
Therefore, the processor can control the constant current power supply module in the driving circuit through the switch circuit, so that the keyboard lamp in the driving circuit can be turned on or turned off. The automatic control of the keyboard lamp of the mobile terminal is realized.
The driving system of the mobile terminal keyboard lamp further comprises:
the request module is connected with the processor and used for sending an opening request or a closing request to the processor;
the processor 100 is specifically configured to send an on instruction command to the switch circuit 200 when receiving the on request, and send an off instruction command to the off circuit 200 when receiving the off request;
the switch circuit 200 is specifically configured to, when receiving the instruction to turn on, turn on the constant current power supply module in the driving circuit 300, so as to turn on the keyboard lamp in the driving circuit 300, and when receiving the instruction to turn off, turn off the constant current power supply module in the driving circuit 300, so as to turn off the keyboard lamp in the driving circuit 300.
Preferably, the request module is an on detection module, configured to send the on request to the processor 100 when it is detected that the mobile terminal is turned on, and send the off request to the processor 100 when it is detected that the mobile terminal is turned off.
Preferably, the request module is a light detection module, connected to the processor, and configured to detect a brightness value of a set range of the mobile terminal, send the start request to the processor 100 when the brightness value is smaller than a first threshold, and send the close request to the processor 100 when the brightness value is larger than a second threshold.
Therefore, when the mobile terminal is turned on or turned off, the processor can automatically control the keyboard lamp to be turned on or turned off. In addition, the mobile terminal can also automatically detect the brightness of the environment, and the keyboard lamp is controlled to be turned on or turned off according to the detected brightness. And the keyboard lamp is driven in a constant current mode, so that the current flowing through the keyboard lamp is consistent, and the brightness difference of the keyboard lamp cannot be caused.
The invention provides a driving method of a mobile terminal keyboard lamp, which is applied to the driving system and comprises the following steps:
obtaining a starting request or a closing request of a keyboard lamp;
and issuing a switch indication command corresponding to the opening request or the closing request to a switch circuit, so that the switch circuit switches on and off a constant current power supply module in a driving circuit under the control of the switch indication command, and a keyboard lamp in the driving circuit is turned on or turned off.
Preferably, the obtaining of the turn-on request or the turn-off request of the keyboard light includes: and receiving a starting request or a closing request of a keyboard lamp from a starting detection module, wherein the starting detection module sends the starting request when detecting that the mobile terminal is started, and sends the closing request when detecting that the mobile terminal is closed.
Preferably, the obtaining of the turn-on request or the turn-off request of the keyboard light includes: the method comprises the steps of receiving a starting request or a closing request of a keyboard lamp from a light detection module, wherein the light detection module detects a brightness value of a set range of the mobile terminal, sends the starting request when the brightness value is smaller than a first threshold value, and sends the closing request when the brightness value is larger than a second threshold value.
Therefore, the constant current power supply module in the driving circuit can be controlled through the switch circuit, so that the keyboard lamp in the driving circuit can be turned on or turned off. The automatic control of the keyboard lamp of the mobile terminal is realized. And the keyboard lamp can be controlled to be turned on or turned off according to the opening or closing of the mobile terminal, or the keyboard lamp can be controlled to be turned on or turned off according to the detected brightness.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a block diagram of a prior art keyboard lamp driving circuit;
FIG. 2 is a block diagram of a driving circuit of a keyboard lamp according to an embodiment of the present invention;
FIG. 3 is a block diagram of a driving circuit of a keyboard lamp according to a second embodiment of the present invention;
FIG. 4 is a block diagram of a driving system for three keyboard lamps according to an embodiment of the present invention;
fig. 5 is a flowchart of driving four keyboard lights according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
In the embodiment of the invention, the keyboard lamp in the mobile terminal is driven in a constant current mode, so that the current flowing through the keyboard lamp is consistent, and the brightness difference of the keyboard lamp cannot be caused.
In the first embodiment, referring to fig. 2, a driving circuit of a mobile terminal keyboard lamp in the embodiment of the present invention includes:
the keyboard lamp comprises a constant current power supply module 202 and a keyboard lamp 201, wherein the constant current power supply module 202 and the keyboard lamp 201 form a current loop.
Fig. 2 shows three current loops consisting of a constant current power module and a keyboard lamp, and each constant current power module 202 and one keyboard lamp 201 are directly connected end to form one current loop. In this way, as long as the current output by each constant current power supply module 202 is consistent, the current flowing through each keyboard lamp is consistent, thereby greatly reducing the probability of causing different brightness of the keyboard lamps.
In the second embodiment, referring to fig. 3, in the embodiment of the present invention, the driving circuit of the mobile terminal keyboard lamp includes: a constant current power supply module 202 and a keyboard 201, and further comprising: the backlight 203. Here, also taking three current loops as an example, in each current loop, the backlight 203 is connected with the keyboard lamp 201 in series and then directly connected with the constant current power supply module 202 end to form one current loop.
In the driving circuit, the keyboard lamps are still driven in a constant current mode, and similarly, as long as the current output by each constant current power supply module 202 is consistent, the current flowing through each keyboard lamp is consistent, so that the probability of different brightness of the keyboard lamps is greatly reduced.
Since the backlight is generally driven by a constant current in the conventional mobile terminal, that is, the backlight driving power supply existing in the mobile terminal is a constant current power supply, in the two embodiments, the constant current power supply module 202 may directly adopt the backlight driving power supply, as shown in fig. 3, the backlight driving chip includes the constant current power supply module 202. Therefore, a separate constant current power supply does not need to be configured, and resources are saved. Moreover, the keyboard lamp can adopt a commonly used light-emitting element such as an LED, and the production cost of the mobile terminal is not increased.
For the mobile terminal adopting the driving circuit of the keyboard lamp, the processor can automatically control the keyboard lamp to be turned on or turned off.
Third embodiment, referring to fig. 4, in an embodiment of the present invention, a driving system of a mobile terminal keyboard lamp includes: the processor 100, the switch circuit 200, and the driving circuit 300, wherein the driving circuit 300 may be the circuit shown in the first embodiment or the second embodiment.
The processor 100 is connected to the switching circuit 200 for issuing a switching indication command to the switching circuit 100.
The switch circuit 200 is connected to the processor 100 and the driving circuit 300, respectively, and is configured to switch the constant current power module in the driving circuit 300 under the control of the received switch indication command, so that the keyboard lamp in the driving circuit 300 is turned on or off.
When the driving circuit 300 further includes a backlight, the keyboard lamp can be controlled to be turned on or off, and the backlight can be controlled to be turned on or off.
Specifically, the drive system further includes: a request module, connected to the processor 100, for sending an open request or a close request to the processor 100.
The processor 100 is specifically configured to send an on instruction command to the switching circuit when an on request is received, and send an off instruction command to the switching circuit when an off request is received.
The switch circuit 200 is specifically configured to, when receiving a start instruction command, start the constant current power supply module in the driving circuit 300, so that the constant current power supply module outputs a set current to light up the keyboard lamp in the driving circuit 300; when receiving the turn-off instruction command, the constant current power supply module in the driving circuit 300 is turned off, so that the constant current power supply module terminates the output current, so that the keypad lamp in the driving circuit 300 is turned off.
When the driving circuit 300 further includes a backlight, the keyboard lamp and the backlight in the circuit 300 can be turned on at the same time when the constant current power supply module outputs the set current, and the keyboard lamp and the backlight in the circuit 300 can be turned off at the same time when the constant current power supply module stops outputting the current.
In this embodiment, the request module may be an on detection module, configured to send an on request to the processor 100 when detecting that the mobile terminal is on, and send an off request to the processor 100 when detecting that the mobile terminal is off.
That is, when the mobile terminal is powered on, the request module sends a turn-on request to the processor 100, so that the processor 100 sends a turn-on instruction command to the switch circuit 200, and the switch circuit 200 turns on the constant current power supply module in the driving circuit 300 according to the turn-on instruction command, so that the keyboard lamp, or the keyboard lamp and the backlight lamp are turned on.
When the mobile terminal is powered off, the request module sends a turn-off request to the processor 100, so that the processor 100 sends a turn-off instruction command to the switch circuit 200, and the switch circuit 200 turns off the constant current power supply module in the driving circuit 300 according to the turn-off instruction command, so that the keyboard lamp, or the keyboard lamp and the backlight lamp are turned off.
In this embodiment, the request module may also be a light detection module, and the light detection module is connected to the processor 100 and configured to detect a brightness value of a set range of the mobile terminal, send an opening request to the processor 100 when the brightness value is smaller than a first threshold, and send a closing request to the processor 100 when the brightness value is larger than a second threshold. Typically the first threshold is less than or equal to the second threshold.
Specifically, when the light of the setting range of the mobile terminal is darkened, that is, the brightness value of the setting range detected by the light detection module is smaller than the first threshold value, a turn-on request is sent to the processor 100, so that the processor 100 sends a turn-on instruction command to the switch circuit 200, and the switch circuit 200 turns on the constant current power supply module in the driving circuit 300 according to the turn-on instruction command, so that the keyboard lamp, or the keyboard lamp and the backlight lamp are turned on. When the light within the setting range of the mobile terminal becomes bright, that is, the brightness value of the setting range detected by the light detection module is greater than the second threshold value, a turn-off request is sent to the processor 100, so that the processor 100 sends a turn-off instruction command to the switch circuit 200, and the switch circuit 200 turns off the constant current power supply module in the driving circuit 300 according to the turn-off instruction command, so that the keyboard lamp, or the keyboard lamp and the backlight lamp are turned off.
Therefore, the driving system of the keyboard lamp can automatically control the on or off of the keyboard lamp, and when the driving circuit also comprises the backlight lamp, the driving circuit can simultaneously control the on or off of the keyboard lamp and the backlight lamp, so that an additional set of driving system is not required, and resources are saved.
In a fourth embodiment, in the above-mentioned driving system of the keyboard lamp, a specific process of driving the keyboard lamp is shown in fig. 5, and includes:
step 501: and receiving a starting request or a closing request of the keyboard lamp.
Specifically, an on request or an off request of the keyboard lamp may be received from the on detection module, wherein the on detection module sends the on request when detecting that the mobile terminal is on, and sends the off request when detecting that the mobile terminal is off.
Or receiving a starting request or a closing request of the keyboard lamp from the light detection module, wherein the light detection module detects the brightness value of the set range of the mobile terminal, sends the starting request when the brightness value is smaller than a first threshold value, and sends the closing request when the brightness value is larger than a second threshold value.
Step 502: and issuing a switch indication command corresponding to the opening request or the closing request to the switch circuit, so that the switch circuit switches on and off the constant current power supply module in the driving circuit under the control of the switch indication command, and the keyboard lamp in the driving circuit is turned on or turned off.
Thus, when the turn-on instruction command is sent to the switch circuit, the switch circuit turns on the constant current power supply module in the driving circuit according to the turn-on instruction command, so that the keyboard lamp or the keyboard lamp and the backlight lamp are turned on. Or when a closing instruction command is sent to the switch circuit, the switch circuit closes the constant current power supply module in the driving circuit according to the closing instruction command, so that the keyboard lamp, or the keyboard lamp and the backlight lamp are turned off.
Therefore, the keyboard lamp can be independently and automatically controlled to be turned on or turned off, and the keyboard lamp and the backlight can be simultaneously controlled to be turned on or turned off, so that the synchronous control of the keyboard lamp and the backlight is realized, and the control flow is reduced.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
1. A driving circuit of a keyboard lamp of a mobile terminal, comprising: the keyboard comprises a constant current power supply module and a keyboard lamp; wherein,
the constant current power supply module and the keyboard lamp form a current loop.
2. The drive circuit of claim 1, further comprising: and the backlight lamp is connected with the keyboard lamp in series and then forms a current loop with the constant current power supply module.
3. The drive circuit according to claim 1 or 2, wherein the constant current power supply module is a backlight drive power supply.
4. The driving circuit according to claim 1 or 2, wherein the keyboard light is an LED light.
5. A driving system of a keyboard lamp of a mobile terminal, comprising: a processor, a switching circuit, and a driver circuit as claimed in any one of claims 1-4; wherein,
the processor is connected with the switch circuit and used for issuing a switch indication command to the switch circuit;
the switch circuit is respectively connected with the processor and the drive circuit and is used for switching on and off the constant current power supply module in the drive circuit under the control of the switch indication command, so that the keyboard lamp in the drive circuit is turned on or turned off.
6. The system of claim 5, further comprising: the request module is connected with the processor and used for sending an opening request or a closing request to the processor;
the processor is specifically configured to send an on instruction command to the switch circuit when receiving the on request, and send an off instruction command to the switch circuit when receiving the off request;
the switch circuit is specifically configured to turn on a constant current power supply module in the driving circuit when receiving the turn-on instruction command, so that a keyboard lamp in the driving circuit is turned on, and turn off the constant current power supply module in the driving circuit when receiving the turn-off instruction command, so that the keyboard lamp in the driving circuit is turned off.
7. The system of claim 6, wherein the requesting module is an on-detection module configured to send the on-request to the processor when the mobile terminal is detected to be on, and send the off-request to the processor when the mobile terminal is detected to be off.
8. The system according to claim 6, wherein the request module is a light detection module, connected to the processor, for detecting a brightness value of a set range of the mobile terminal, and sending the on request to the processor when the brightness value is smaller than a first threshold, and sending the off request to the processor when the brightness value is greater than a second threshold.
9. A driving method of a keyboard lamp of a mobile terminal, applied to the driving system of any one of claims 5 to 8, comprising:
obtaining a starting request or a closing request of a keyboard lamp;
and issuing a switch indication command corresponding to the opening request or the closing request to a switch circuit, so that the switch circuit switches on and off a constant current power supply module in a driving circuit under the control of the switch indication command, and a keyboard lamp in the driving circuit is turned on or turned off.
10. The method of claim 9, wherein the obtaining a key board light turn-on request or turn-off request comprises:
and receiving a starting request or a closing request of a keyboard lamp from a starting detection module, wherein the starting detection module sends the starting request when detecting that the mobile terminal is started, and sends the closing request when detecting that the mobile terminal is closed.
11. The method of claim 9, wherein the obtaining a key board light turn-on request or turn-off request comprises:
the method comprises the steps of receiving a starting request or a closing request of a keyboard lamp from a light detection module, wherein the light detection module detects a brightness value of a set range of the mobile terminal, sends the starting request when the brightness value is smaller than a first threshold value, and sends the closing request when the brightness value is larger than a second threshold value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210468194.9A CN102933002B (en) | 2012-11-19 | 2012-11-19 | A kind of drive circuit, system and method for Mobile terminal keyboard lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210468194.9A CN102933002B (en) | 2012-11-19 | 2012-11-19 | A kind of drive circuit, system and method for Mobile terminal keyboard lamp |
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| CN102933002A true CN102933002A (en) | 2013-02-13 |
| CN102933002B CN102933002B (en) | 2016-03-23 |
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| CN201210468194.9A Active CN102933002B (en) | 2012-11-19 | 2012-11-19 | A kind of drive circuit, system and method for Mobile terminal keyboard lamp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112287630A (en) * | 2019-07-09 | 2021-01-29 | 苏州市悠越电子有限公司 | A method for improving the resistance value of the inner loop of the keyboard and optimizing the layout of the printed circuit |
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| CN102933002B (en) | 2016-03-23 |
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