CN202394744U - Circuit and terminal capable of indicating key states through LED (light-emitting diode) lamps - Google Patents
Circuit and terminal capable of indicating key states through LED (light-emitting diode) lamps Download PDFInfo
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- CN202394744U CN202394744U CN201120464530.3U CN201120464530U CN202394744U CN 202394744 U CN202394744 U CN 202394744U CN 201120464530 U CN201120464530 U CN 201120464530U CN 202394744 U CN202394744 U CN 202394744U
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Abstract
The utility model discloses a circuit and terminal capable of indicating key states through LED (light-emitting diode) lamps. The circuit comprises a first key event detection circuit, a second key event detection circuit, a control circuit and a key state indication circuit, wherein the first key event detection circuit is used for detecting a first key event and transmitting the first key event to the control circuit; the second key event detection circuit is used for detecting a second key event and transmitting the second key event to the control circuit; the control circuit is used for controlling all LED lamps corresponding to a key to be in a low-brightness state according to the first key event, and further used for controlling LED lamps corresponding to a pressed key to be in a high-brightness state according to the received second key event; and the key state indication circuit comprises a plurality of LED lamps arranged in parallel, and is used for indicating the key states of corresponding keys under the control of the control circuit. According to the circuit and terminal capable of indicating key states through LED lamps disclosed by the utility model, because the different states of a corresponding key can be displayed just by using a monochromatic common LED lamp, the cost of the terminal can be lowered to a certain extent.
Description
Technical field
The utility model relates to LED lamp application, in particular to a kind of circuit and terminal through LED lamp indication key-press status.
Background technology
In the consumer electronics product in modern society; Most of electronic products possesses the LED lamp; For example the LED lamp is used as the backlight of electronic product display screen, thereby the display screen that makes things convenient for the user to pass through electronic product is read related content, perhaps with the backlight of LED lamp as the key board of electronic product; Thereby make things convenient for the user can find corresponding button accurately, and then carry out corresponding button operation and handle.But the brightness display packing of the LED lamp of these electronic products only can be controlled said LED lamp and be in bright or the two states that goes out usually, is inconvenient to be used for can in time check the electronic product key-press status at night.
Chinese patent CN03276362.X discloses a kind of device of indicator light show state control; It comprises temperature display circuit and the heat pipe of being made up of the thermistor of mutual series connection, LED light, current-limiting resistance, power supply; Wherein, be connected heat pipe between thermistor and the computer heater element with heat-conducting glue, when the caloric value of computer heater element is excessive; The resistance of thermistor diminishes; The distribution voltage of LED light changes, and causes the brightness of LED light to change, with the febrile state of the current computer of variation explicit user of this brightness.In the method, utilize the impedance magnitude control LED brightness of thermistor under different temperatures to change indication computer heating situation.But the situation that this method can not push button according to the user, the brightness of control LED lamp changes, thereby indicates key-press status for the user.
The utility model content
The purpose of the utility model is to provide a kind of brightness of the situation control LED lamp that can push button according to the user to change, thereby indicates the circuit and the terminal that the LED lamp is indicated key-press status of pass through of key-press status for the user.
In order to reach the purpose of above-mentioned the utility model, the utility model adopts following technical scheme to realize:
A kind of circuit through LED lamp indication key-press status comprises the first key-press event testing circuit, control circuit, the second key-press event testing circuit, and the key-press status indicating circuit, wherein,
The first key-press event testing circuit is used to detect first key-press event and sends it to control circuit;
The second key-press event testing circuit is used to detect second key-press event and sends it to control circuit;
Control circuit is used for being in low bright state according to these all LED lamps corresponding with button of first key-press event control; And said control circuit is further used for being in high bright state according to this second key-press event control with the button corresponding LED lamp that is pressed;
The key-press status indicating circuit comprises many LED lamps that are set up in parallel, and is used for indicating down according to the control of said control circuit the key-press status of respective keys.
Preferably, the said first key-press event testing circuit obtains first key-press event through the situation that detects any button and be pressed.
Preferably; Said key-press status indicating circuit specifically comprises: be connected to the divider resistance R1 of control circuit the one GPIO mouth, the State Control triode Q1 that its base stage is connected to divider resistance R1; And one the anode common port be connected to the LED lamp and the joint group of this State Control triode Q1 collector electrode; The emitter of said State Control triode Q1 connects high level; The negative electrode common end grounding of said LED lamp and joint group, a plurality of the 2nd GPIO mouths of said control circuit respectively with LED lamp and joint group in the negative electrode of single led lamp be connected.
Preferably, the two ends of each LED lamp in said LED lamp and the joint group all are provided with current-limiting resistance.
Preferably, when the first key-press event testing circuit does not detect first key-press event, a GPIO mouth of said control circuit output high level.
Preferably, when the first key-press event testing circuit detects first key-press event, a GPIO mouth output low level of said control circuit, and a plurality of the 2nd GPIO mouths of said control circuit are all exported high level.
Preferably; When the second key-press event testing circuit detects second key-press event; The one GPIO mouth output low level of said control circuit; And said control circuit and corresponding the 2nd GPIO mouth output low level of button that be pressed, other of said control circuit the 2nd GPIO mouth output high level.
A kind of terminal, it comprises aforesaid circuit through LED lamp indication key-press status, said circuit comprises the first key-press event testing circuit, control circuit, the second key-press event testing circuit, and the key-press status indicating circuit, wherein,
The first key-press event testing circuit is used to detect first key-press event and sends it to control circuit;
The second key-press event testing circuit is used to detect second key-press event and sends it to control circuit;
Control circuit is used for being in low bright state according to these all LED lamps corresponding with button of first key-press event control; And said control circuit is further used for being in high bright state according to second key-press event control that receives and the button corresponding LED lamp that is pressed;
The key-press status indicating circuit comprises many LED lamps that are set up in parallel, and is used for indicating down according to the control of said control circuit the key-press status of respective keys.
Technical scheme through above-mentioned the utility model can be found out; Because but the technology of the components and parts (for example said components and parts are the LED lamp) of the GPIO mouth of control circuit MCU control show state is comparatively ripe; Therefore through pass through of providing of the utility model circuit that the LED lamp indicates key-press status when the realization state is indicated; It is less to take software resource, has reduced the R&D cycle; And circuit and the terminal of passing through LED lamp indication key-press status through the utility model provides because the common LED lamp of a kind of monochrome of use just can demonstrate the residing different conditions of corresponding key, thereby can reduce the cost at terminal to a certain extent.
Description of drawings
Fig. 1 is the electrical block diagram that passes through LED lamp indication key-press status that the utility model embodiment provides;
Fig. 2 is the method flow sketch map that passes through LED lamp indication key-press status that the utility model embodiment provides.
The realization of the utility model purpose, functional characteristics and excellent effect will combine specific embodiment and accompanying drawing to do further explanation below.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the said technical scheme of the utility model is done further to describe in detail; So that those skilled in the art can better understand the utility model and implementing, but the embodiment that lifts not conduct to the qualification of the utility model.
As shown in Figure 1, the utility model embodiment provides a kind of circuit through LED lamp indication key-press status comprises the first key-press event testing circuit 10, control circuit 30, the second key-press event testing circuit 20, and key-press status indicating circuit 40, wherein,
The first key-press event testing circuit 10 is used to detect first key-press event and sends it to control circuit 30; Wherein, the said first key-press event testing circuit 10 obtains first key-press event through the situation that detects any button and be pressed;
The second key-press event testing circuit 20 is used to detect second key-press event and sends it to control circuit 30;
Control circuit 30 is used for being in low bright state according to these all LED lamps corresponding with button of first key-press event control; And said control circuit 30 is further used for being in high bright state according to second key-press event control that receives and the button corresponding LED lamp that is pressed;
Key-press status indicating circuit 40 comprises many LED lamps that are set up in parallel, and is used for indicating down according to the control of said control circuit 30 key-press status of respective keys.Wherein, the LED lamp that said key-press status indicating circuit 40 comprises includes three kinds of states: LED goes out, and the LED lamp is low bright, LED lamp Gao Liang.When the first key-press event testing circuit 10 detected first key-press event, said control circuit 30 was in low bright state according to these all LED lamps corresponding with button of first key-press event control; When the second key-press event testing circuit 20 detected first key-press event, said control circuit 30 was further used for being in high bright state according to second key-press event control that receives and the button corresponding LED lamp that is pressed.
Under the preferred implementation; Said key-press status indicating circuit 40 specifically comprises: be connected to the divider resistance R1 of control circuit 30 a GPIO mouth, the State Control triode Q1 that its base stage is connected to divider resistance R1; And one the anode common port be connected to the LED lamp and the joint group of this State Control triode Q1 collector electrode; The emitter of said State Control triode Q1 meets high level VI, the negative electrode common end grounding of said LED lamp and joint group, a plurality of the 2nd GPIO mouths of said control circuit 30 respectively with LED lamp and joint group in the negative electrode of single led lamp be connected; Wherein, The two ends of each LED lamp in said LED lamp and the joint group all are provided with current-limiting resistance, and for example: the two ends of the LED lamp LED1 that comprises in said LED lamp and the joint group are provided with current-limiting resistance R2 and R3, and the two ends of LED lamp LED2 are provided with current-limiting resistance R4 and R5; The two ends of LED lamp LED3 are provided with current-limiting resistance R6 and R7, and the two ends of LED lamp LED4 are provided with current-limiting resistance R8 and R9.
When the first key-press event testing circuit 10 does not detect first key-press event, the GPIO mouth of said control circuit MCU30 output high level.
At this moment, all LED lamps of comprising of key-press status indicating circuit 40 go out.When not having key-press event to take place,, require all LED lamps to go out in order to reduce power consumption.As shown in Figure 2; Control circuit MCU30 is connected to the base stage of State Control triode Q1 through divider resistance R1 through a GPIO mouth; When a GPIO mouth (like the LED_C mouth among Fig. 2) of said control circuit 30 is exported high level; State Control triode Q1 can not conducting, and the high level VI voltage of 3.3V can't arrive the LED lamp that key-press status indicating circuit 40 comprises through this State Control triode Q1, so all LED lamps can not lighted; Do not have electric current to pass through said LED lamp thus, Overall Power Consumption reduces.
When the first key-press event testing circuit 10 detects first key-press event, a GPIO mouth output low level of said control circuit 30, and a plurality of the 2nd GPIO mouths of said control circuit 30 are all exported high level.
At this moment, all LED lamps of comprising of key-press status indicating circuit 40 are low bright.When the first key-press event testing circuit 10 detects first key-press event; After control circuit MCU30 receives first key-press event; GPIO mouth (being LED_C) output low level through control circuit MCU30; The complete conducting of State Control triode Q1 this moment, 3.3V high level VI voltage is through the State Control triode.Simultaneously, the 2nd GPIO mouth of control circuit MCU30 (like the High_L1 mouth among Fig. 2, High_L2 mouth, High_L3 mouth, High_L4 mouth ...) output high level, the loop of for example flowing through one of them LED lamp LED1 electric current is:
3.3V → State Control triode Q1 → current-limiting resistance R2 → LED lamp LED1 → current-limiting resistance R3 → GND,
Therefore, the electric current through LED lamp LED1 is about (3.3V-V
Q1-V
LED1)/(R2+R3), wherein, said V
Q1Be the turn-on voltage of State Control triode Q1, said V
LED1For loading on the magnitude of voltage at LED lamp LED1 two ends; At this moment, all LED lamps are in low bright state, and the function silk-screen of all buttons is presented on the panel at terminal; The user can discern the function of different key through the function silk-screen that shows, thereby makes things convenient for it to press required button.
When the second key-press event testing circuit 20 detects second key-press event; The one GPIO mouth output low level of said control circuit 30; And said control circuit 30 and corresponding the 2nd GPIO mouth output low level of button that be pressed, other the 2nd GPIO mouths output high level of said control circuit 30.
At this moment, the key-press status indicating circuit 40 LED lamp Gao Liangs corresponding with the button that is pressed that comprise, all the other LED lamps are low bright state.After control circuit MCU30 detects second key-press event through the second key-press event testing circuit 20; Will be corresponding with corresponding button the 2nd GPIO mouth (for example being the High_L1 mouth) output low level; Other GPIO mouth (for example High_L2 mouth, High_L3 mouth, High_L4 mouth ...) continues the output high level, and the current circuit of LED1 such as the LED that flows through this moment is:
3.3V → State Control triode Q1 → current-limiting resistance R2 → LED lamp LED1 → High_L1 mouth,
Therefore, the electric current through LED lamp LED1 is about: (3.3V-V
Q1-V
LED1)/R2, wherein, said V
Q1Be the turn-on voltage of State Control triode Q1, said V
LED1For loading on the magnitude of voltage at LED lamp LED1 two ends; Yet the electric current of other LED lamps of flowing through still is that (size that is said current value is (3.3V-V to the electric current that hangs down bright state
Q1-V
LED1)/(R2+R3)).At this moment, the electric current that flows through LED lamp LED1 increases, and LED lamp LED1 then becomes high bright state, and all the other LED lamps (LED2, LED3, LED4) still are low bright state, make things convenient for User Recognition to distinguish the keypress function of pressing this moment.
The utility model embodiment also provides a kind of terminal; It comprises aforesaid circuit through LED lamp indication key-press status; Continuation is with reference to Fig. 1, and said circuit comprises the first key-press event testing circuit 10, control circuit 30, the second key-press event testing circuit 20, and key-press status indicating circuit 40; Wherein
The first key-press event testing circuit 10 is used to detect first key-press event and sends it to control circuit 30;
The second key-press event testing circuit 20 is used to detect second key-press event and sends it to control circuit 30;
Control circuit 30 is used for being in low bright state according to these all LED lamps corresponding with button of first key-press event control; And said control circuit 30 is further used for being in high bright state according to this second key-press event control with the button corresponding LED lamp that is pressed;
The second key-press event testing circuit 20 is used to detect second key-press event and sends it to control circuit 30;
Key-press status indicating circuit 40 comprises many LED lamps that are set up in parallel, and is used for indicating down according to the control of said control circuit 30 key-press status of respective keys.
Please refer to mentioned abovely for the detailed description of said circuit through LED lamp indication key-press status, related content will repeat no more here.
For the said terminal that the utility model embodiment provides, it can be DVD, television set, MP3, MP4, MP5, computer, mobile phone, MINISPEAKER, AUDIO.The terminal that the utility model embodiment provides is owing to comprise the circuit that passes through LED lamp indication key-press status mentioned above; And in this circuit; Because but the technology of the LED lamp of the GPIO mouth of control circuit MCU30 control show state is comparatively ripe; Therefore through pass through of providing of the utility model circuit that the LED lamp indicates key-press status when the realization state is indicated, it is less to take software resource, has reduced the R&D cycle; And this terminal is owing to use a kind of common LED lamp of monochrome just can demonstrate the residing different conditions of corresponding key, thereby can reduce the cost at terminal to a certain extent.
Correspondingly, as shown in Figure 2, the utility model embodiment also provides a kind of method through LED lamp indication key-press status, and it is applied among the above-mentioned circuit or terminal that pass through LED lamp indication key-press status, and it comprises following concrete steps:
S101, detect first key-press event, and be in the bright state that hangs down according to these all LED lamps corresponding of first key-press event control with button;
In this step, with reference to figure 1, for example can detect first key-press event that pushes button through the first key-press event testing circuit 10, in concrete application process, said first key-press event produces through pressing any button.For example the user can produce said first key-press event through the mechanical type button of pressing the terminal; Thereby also can through the key induced user of the capacitive induction that the terminal comprises the button that will press produce said first key-press event; When control circuit 30 (MCU) receives this first key-press event; The pairing LED lamp of all buttons that can control terminal comprises is in low bright state; This moment, but the button of indicating user terminal was in state of activation, and was in low bright state and can makes things convenient for the user to see the function silk-screen of button clearly through controlling said LED lamp.
S102, detect second key-press event, and be in high bright state with the button corresponding LED lamp that is pressed according to this second key-press event control.
In this step; For example can detect second key-press event that pushes button through the second key-press event testing circuit 20, likewise, in concrete application process; The user can produce said second key-press event through the mechanical type button of pressing the terminal; Thereby also can through the key induced user of the capacitive induction that the terminal comprises the button that will press produce said second key-press event, at this moment, when control circuit 30 (MCU) receives this second key-press event; What can control terminal comprise is in high bright state with the pairing LED lamp of the said button that is pressed, and this moment, other LED lamp still was in low bright state.
It should be noted that; The time interval that the said first button time and second key-press event produce need be within the time interval threshold value that is provided with in advance; After the generation that detects first key-press event; Exceed said time interval when detecting second key-press event once more during threshold value; Then control circuit 30 (MCU) no longer is in high bright state according to this second key-press event control with the button corresponding LED lamp that is pressed, but this second key-press event is regarded as first key-press event, thereby makes control circuit 30 (MCU) be in low bright state according to these all LED lamps corresponding with button of first key-press event control.
The above is merely the preferred embodiment of the utility model; Be not thus the restriction the utility model claim; Every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the utility model.
Claims (8)
1. the circuit through LED lamp indication key-press status is characterized in that, comprises the first key-press event testing circuit, control circuit, the second key-press event testing circuit, and the key-press status indicating circuit, wherein,
The first key-press event testing circuit is used to detect first key-press event and sends it to control circuit;
The second key-press event testing circuit is used to detect second key-press event and sends it to control circuit;
Control circuit is used for being in low bright state according to these all LED lamps corresponding with button of first key-press event control; And said control circuit is further used for being in high bright state according to second key-press event control that receives and the button corresponding LED lamp that is pressed;
The key-press status indicating circuit comprises many LED lamps that are set up in parallel, and is used for indicating down according to the control of said control circuit the key-press status of respective keys.
2. the circuit through LED lamp indication key-press status as claimed in claim 1 is characterized in that, the said first key-press event testing circuit obtains first key-press event through the situation that detects any button and be pressed.
3. the circuit through LED lamp indication key-press status as claimed in claim 1; It is characterized in that; Said key-press status indicating circuit specifically comprises: be connected to the divider resistance R1 of control circuit the one GPIO mouth, the State Control triode Q1 that its base stage is connected to divider resistance R1; And one the anode common port be connected to the LED lamp and the joint group of this State Control triode Q1 collector electrode; The emitter of said State Control triode Q1 connects high level, the negative electrode common end grounding of said LED lamp and joint group, a plurality of the 2nd GPIO mouths of said control circuit respectively with LED lamp and joint group in the negative electrode of single led lamp be connected.
4. the circuit through LED lamp indication key-press status as claimed in claim 3 is characterized in that the two ends of each LED lamp in said LED lamp and the joint group all are provided with current-limiting resistance.
5. the circuit through LED lamp indication key-press status as claimed in claim 4 is characterized in that, when the first key-press event testing circuit does not detect first key-press event, and a GPIO mouth of said control circuit output high level.
6. the circuit through LED lamp indication key-press status as claimed in claim 4; It is characterized in that; When the first key-press event testing circuit detects first key-press event; The one GPIO mouth output low level of said control circuit, and a plurality of the 2nd GPIO mouths of said control circuit are all exported high level.
7. the circuit through LED lamp indication key-press status as claimed in claim 4; It is characterized in that; When the second key-press event testing circuit detects second key-press event; The one GPIO mouth output low level of said control circuit, and said control circuit and corresponding the 2nd GPIO mouth output low level of button that be pressed, other of said control circuit the 2nd GPIO mouth output high level.
8. a terminal is characterized in that, comprises arbitrary described circuit through LED lamp indication key-press status like claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120464530.3U CN202394744U (en) | 2011-11-21 | 2011-11-21 | Circuit and terminal capable of indicating key states through LED (light-emitting diode) lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120464530.3U CN202394744U (en) | 2011-11-21 | 2011-11-21 | Circuit and terminal capable of indicating key states through LED (light-emitting diode) lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202394744U true CN202394744U (en) | 2012-08-22 |
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ID=46669651
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120464530.3U Expired - Fee Related CN202394744U (en) | 2011-11-21 | 2011-11-21 | Circuit and terminal capable of indicating key states through LED (light-emitting diode) lamps |
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| CN (1) | CN202394744U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103298217A (en) * | 2013-06-26 | 2013-09-11 | 深圳市共进电子股份有限公司 | Light-emitting diode (LED) reminding light system capable of representing various working states |
| CN104780637A (en) * | 2014-01-10 | 2015-07-15 | 海洋王（东莞）照明科技有限公司 | Control circuit and lighting device |
| CN105280414A (en) * | 2014-07-04 | 2016-01-27 | 上海浚蔚电子科技有限公司 | RFID hand-held terminal scanning button safety switch device and terminal thereof |
| CN110290612A (en) * | 2018-03-19 | 2019-09-27 | 无锡华润矽科微电子有限公司 | Matrix LED controling circuit structure |
| CN112061023A (en) * | 2019-06-11 | 2020-12-11 | 浙江吉利控股集团有限公司 | Key function indicating device and steering wheel and moving body with same |
| CN114938551A (en) * | 2022-05-19 | 2022-08-23 | 苏州联讯仪器有限公司 | LED control method and related assembly |
-
2011
- 2011-11-21 CN CN201120464530.3U patent/CN202394744U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103298217A (en) * | 2013-06-26 | 2013-09-11 | 深圳市共进电子股份有限公司 | Light-emitting diode (LED) reminding light system capable of representing various working states |
| CN104780637A (en) * | 2014-01-10 | 2015-07-15 | 海洋王（东莞）照明科技有限公司 | Control circuit and lighting device |
| CN104780637B (en) * | 2014-01-10 | 2019-10-15 | 海洋王（东莞）照明科技有限公司 | A kind of control circuit and lighting device |
| CN105280414A (en) * | 2014-07-04 | 2016-01-27 | 上海浚蔚电子科技有限公司 | RFID hand-held terminal scanning button safety switch device and terminal thereof |
| CN110290612A (en) * | 2018-03-19 | 2019-09-27 | 无锡华润矽科微电子有限公司 | Matrix LED controling circuit structure |
| CN110290612B (en) * | 2018-03-19 | 2021-08-27 | 华润微集成电路(无锡)有限公司 | Matrix type LED control circuit structure |
| CN112061023A (en) * | 2019-06-11 | 2020-12-11 | 浙江吉利控股集团有限公司 | Key function indicating device and steering wheel and moving body with same |
| CN114938551A (en) * | 2022-05-19 | 2022-08-23 | 苏州联讯仪器有限公司 | LED control method and related assembly |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120822 Termination date: 20201121 |
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| CF01 | Termination of patent right due to non-payment of annual fee |