CN201119059Y - A background light control circuit - Google Patents
A background light control circuit Download PDFInfo
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- CN201119059Y CN201119059Y CNU2007200740868U CN200720074086U CN201119059Y CN 201119059 Y CN201119059 Y CN 201119059Y CN U2007200740868 U CNU2007200740868 U CN U2007200740868U CN 200720074086 U CN200720074086 U CN 200720074086U CN 201119059 Y CN201119059 Y CN 201119059Y
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Abstract
The utility model relates to a back light controlling circuit. The circuit comprises a central processing unit, a controlling unit connected with the central processing unit, at least two light emitting diodes, and a power supply controller connected with the central processing unit and used for driving the light emitting diodes; the controlling unit receives the control information of the central processing unit, and controls the switch-on or switch-off of each light emitting diode according to the control information; the power supply controller is connected with the light emitting diodes, and provides operating current and operating voltage which are adapted to the light emitting diodes controlled by the controlling unit for the light emitting diodes according to the control information control of the central processing unit. The utility model provides the back light controlling circuit, and the back light controlling circuit is used for solving the problems that single control of the light emitting diodes and the control of the back light brightness cannot be realized in the background technology.
Description
Technical field
The utility model relates to a kind of circuit, particularly a kind of backlight control circuit.
Background technology
The design of backlight circuit at present has series connection and two kinds of connected modes of parallel connection LED (light-emitting diode).LED in the series circuit, backlight illumination show evenly, but sort circuit needs booster circuit that bigger voltage is provided, and this booster circuit produces many interference signals simultaneously boosting.
LED in the parallel circuits does not need bigger voltage, but needs to consume bigger electric current.And the very difficult control of the circuit backlight illumination of this connected mode, backlight illumination shows inhomogeneous usually.For the demanding design of the backlight illumination uniformity, just can not use the connected mode of parallel circuits as backlight circuit.
Existing backlight circuit is no matter be series connection or parallel connection LED connected mode, and the brightness of LED all can be regulated, but this adjusting brightens or deepening LED integral body, can not select wherein some LED bright, and some LED go out.Under many circumstances, owing to can not control some LED separately, just may cause unnecessary waste.
Therefore, how to provide a kind of backlight control circuit, can control brightness backlight as required, and can control the light on and off of concrete LED in the backlight circuit.
The utility model content
The purpose of this utility model provides a kind of backlight control circuit, is used for solving the independent control that background technology can not realize light-emitting diode, can't realize the control problem of backlight illumination.
For solving the problems of the technologies described above, the utility model provides a kind of backlight control circuit, described circuit comprises CPU, the control unit that links to each other with described CPU, at least two light-emitting diodes, and the power-supply controller of electric that is used to drive described light-emitting diode that links to each other with CPU;
Described control unit receives the control information of described CPU, controls the conducting of each described light-emitting diode or closes according to described control information;
Described power-supply controller of electric links to each other with described light-emitting diode, is controlled to be operating current and the operating voltage that described light-emitting diode provides the described light-emitting diode with described control unit control to adapt according to the control information of described CPU.
Preferably, described control unit receives the control information of described CPU, switches the connected mode of the in parallel or series connection between the described light-emitting diode according to described control information.
Preferably, described control unit is specially the triode that links to each other with described light-emitting diode; The control utmost point of described triode links to each other with described CPU, described CPU by controlling described triode conducting or close the connected mode of switching between the described light-emitting diode.
Preferably, described power-supply controller of electric comprises LED power source controller in parallel and series connection LED power source controller;
Described CPU all links to each other with series connection LED power source controller with described LED power source controller in parallel, and described central processing unit controls provides connect LED power source controller or the LED power source controller in parallel that the serial or parallel connection mode adapts between the described light-emitting diode that switches with described control unit for described light-emitting diode.
Preferably, described control unit is specially first triode that is connected between the described light-emitting diode, and is connected second triode between described first triode and the described LED power source controller in parallel; Described CPU by controlling described first triode and second triode conducting or close the connected mode of switching between the described light-emitting diode.
Preferably, described power-supply controller of electric is specially series connection LED power source controller; Described light-emitting diode is the superbright light-emitting diode;
Described CPU all links to each other with described series connection LED power source controller, the working power that connected mode adapts between the described light-emitting diode that the described series connection LED power source of described central processing unit controls controller provides for described light-emitting diode and described control unit switches.
Preferably, described control unit is specially and is connected on each described light-emitting diode and described the 3rd triode of connecting between the LED power source controller, and be connected the 4th triode between the described light-emitting diode base stage and be connected described light-emitting diode base stage and another light-emitting diode emitter between the 5th triode;
Described CPU by controlling described the 3rd triode, the 4th triode and second triode conducting or close the connected mode of switching between the described light-emitting diode.
Preferably, described CPU is controlled described control unit by general input/output port.
Because the described control unit of the utility model embodiment can be selected which the light-emitting diode conducting in the control backlight control circuit according to the control information of described CPU, which light-emitting diode is closed; Described CPU is controlled power-supply controller of electric simultaneously operating current and the operating voltage that adapts with above-mentioned light-emitting diode is provided.So just can realize the independent control of the light-emitting diode in the backlight control circuit, can be according to concrete needs control brightness backlight.
Description of drawings
Fig. 1 is a backlight control circuit structured flowchart described in the utility model;
Fig. 2 is first kind of embodiment physical circuit of backlight control circuit described in the utility model figure;
Fig. 3 is second kind of embodiment physical circuit of backlight control circuit described in the utility model figure.
Embodiment
The utility model provides a kind of backlight control circuit, is used for solving background technology and can not controls the conducting of light-emitting diode separately or close the problem of uncontrollable backlight illumination.
Core of the present utility model is by increasing control unit in existing backlight circuit, controls the conducting of each described light-emitting diode or closes according to described control unit.
In order to make those skilled in the art person understand the utility model scheme better, the utility model is described in further detail below in conjunction with drawings and embodiments.
Referring to Fig. 1, this figure is a backlight control circuit structured flowchart described in the utility model.
The described backlight control circuit of the utility model embodiment, control unit that described circuit comprises CPU 11, link to each other with described CPU 11 12, at least two light-emitting diodes, and the power-supply controller of electric 13 that is used to drive described light-emitting diode that links to each other with CPU 11.
Described control unit 12 receives the control information of described CPU 11, controls the conducting of the first light-emitting diode 14a and the second light-emitting diode 14b or closes according to described control information.
Described control unit 12 can be selected which the light-emitting diode conducting in the control backlight control circuit according to the control information of described CPU 11, and which light-emitting diode is closed, and can realize the independent control of light-emitting diode.
Described power-supply controller of electric 13 links to each other with described light-emitting diode with described CPU 11, be sent to the control information of described control unit 12 according to described CPU 11, the operating current and the operating voltage that provide the described light-emitting diode with described control unit 12 controls to adapt for described light-emitting diode.
Described light-emitting diode comprises the first light-emitting diode 14a and the second light-emitting diode 14b at least.Described power-supply controller of electric 13 provides operating current and operating voltage according to the control information of described CPU 11 for described light-emitting diode.
Because light-emitting diode required operating circuit when in parallel or series connection is different with operating voltage, the concrete driving power that described power-supply controller of electric 13 provides is to change according to different series-parallel circuits.
The concrete driving power that described power-supply controller of electric 13 provides--operating current and operating voltage is to adapt with the first light-emitting diode 14a of described CPU 11 controls and the concrete conducting of the second light-emitting diode 14b or the physical circuit of closing.
Because the described control unit 12 of the utility model embodiment can be selected which the light-emitting diode conducting in the control backlight control circuit according to the control information of described CPU 11, which light-emitting diode is closed; Described CPU 11 is controlled power-supply controller of electric 13 simultaneously operating current and the operating voltage that adapts with above-mentioned light-emitting diode is provided.So just can realize the independent control of the light-emitting diode in the backlight control circuit, can be according to concrete needs control brightness backlight.
Described CPU 11 can be selected concrete described backlight control circuit display format by the operating key that is attached thereto, and realizes the independent control to concrete light-emitting diode.
When described control unit 12 and two light-emitting diodes--when the first light-emitting diode 14a links to each other with the second light-emitting diode 14b, described CPU 11 can also be controlled the described first light-emitting diode 14a and the second light-emitting diode 14b with different connected modes--and parallel connection or series system show, and control operating current and operating voltage that power-supply controller of electric 13 provides the connected mode with the above-mentioned first light-emitting diode 14a and the second light-emitting diode 14b to adapt simultaneously.
Described CPU 11 can be selected the series connection or the parallel form of light-emitting diode in the concrete described backlight circuit by the operating key that is attached thereto, and realizes the control that concrete LED backlight is shown.
Because the described control unit 12 of the utility model embodiment can be according to the control information of CPU 11, control the switching of series connection and parallel way between the first light-emitting diode 14a and the second light-emitting diode 14b.And described CPU 11 is controlled operating current and operating voltage that power-supply controller of electric 13 provides corresponding connected mode with above-mentioned light-emitting diode to adapt simultaneously.Therefore, the described backlight control circuit of the utility model embodiment can be realized the control to demonstration backlight.
The backlight control process of the concrete product of using backlight control circuit described in the utility model is as follows: when the uniformity backlight requires than higher the time, can pass through operating key, send control information to CPU 11, CPU 11 sends the series connection control information to control unit 12.Control unit 12 is controlled described light-emitting diode and is adopted series system to connect according to this control information.CPU 11 sends control information to power-supply controller of electric 13 sending the series connection control information in control unit 12, required operating current and operating voltage when control power-supply controller of electric 13 provides the light-emitting diode series connection.
When the user uses the higher even back of product needed of using the described backlight control circuit of the utility model embodiment to spend, for example play games or when seeing data, at this moment just can adopt series system to show, make the user obtain visual effect preferably by CPU 11 control light-emitting diodes.
Use the product of having used the described backlight control circuit of the utility model embodiment as the user, when the even back degree that needs is low, can adopt parallel way to show by CPU 11 control light-emitting diodes, make the user obtain the visual effect that needs.
Certainly, the user also can select some light-emitting diode conductings in the backlight control circuit, and other light-emitting diode is closed, and also can select some light-emitting diode conductings, thereby strengthen user experience.
The described control unit of the utility model embodiment specifically can adopt the triode that links to each other with described light-emitting diode.The control utmost point of described triode links to each other with described CPU 11, receives the control information of described CPU.Described CPU 11 by controlling described triode conducting or close the connected mode of switching between the described light-emitting diode.
Referring to Fig. 2, this figure is first kind of embodiment physical circuit of backlight control circuit described in the utility model figure.
Described power-supply controller of electric 13 specifically comprises LED power source controller 13a in parallel and series connection LED power source controller 13b.
Described CPU 11 all links to each other with series connection LED power source controller 13b with described LED power source controller 13a in parallel, and described CPU 11 is controlled to be described light-emitting diode the corresponding power-supply controller of electric of power mode that connected mode adapts between the described light-emitting diode that switches with described control unit 12 is provided.
First kind of embodiment physical circuit of backlight control circuit described in the utility model comprises four light-emitting diodes, is specially light-emitting diode D1, light-emitting diode D2, light-emitting diode D3 and light-emitting diode D4.Above-mentioned four light-emitting diodes are connected on the two ends of described series connection LED power source controller 13b.Series connection triode Q1 between light-emitting diode D1 and the light-emitting diode D2.Series connection triode Q2 between light-emitting diode D2 and the light-emitting diode D3.Series connection triode Q3 between light-emitting diode D3 and the light-emitting diode D4.Series connection triode Q4 between light-emitting diode D4 and the series connection LED power source controller 13b.
Simultaneously, light-emitting diode D1, light-emitting diode D2, light-emitting diode D3 and light-emitting diode D4 are connected in parallel on the two ends of LED power source controller 13a in parallel.Triode Q5, triode Q6, triode Q8 and triode Q7 connect respectively between the emitter of light-emitting diode D1, light-emitting diode D2, light-emitting diode D3 and light-emitting diode D4 and the described LED power source controller 13a in parallel.
Not shown CPU 11 among Fig. 2, the control of all triodes--triode Q1, triode Q2, triode Q3, triode Q4, triode Q5, triode Q6, triode Q8 and triode Q7 extremely all has CPU 11 to link to each other.CPU 11 also links to each other with the control input end of series connection LED power source controller 13b with described LED power source controller 13a in parallel respectively.
Particularly, described CPU 11 is by the described control unit 12 of GPIO (general input/output port) control.Described CPU 11 can adopt control chip, and the control input end of the control utmost point of above-mentioned triode and described LED power source controller 13a in parallel and series connection LED power source controller 13b is connected the different output pins or the GPIO of described control chip respectively.
Described control chip is according to concrete control requirement, control the concrete control signal of different output pins or GPIO output, control closing or conducting of above-mentioned triode, control described LED power source controller 13a in parallel simultaneously or series connection LED power source controller 13b provides driving power for the above-mentioned light-emitting diode of conducting that needs, thereby realized the control of demonstration backlight.
The backlight control process of the product of first kind of described backlight control circuit of embodiment of concrete application the utility model is as follows:
When showing for backlight illumination under the situation of evenly having relatively high expectations, by described CPU 11 control triode Q1, triode Q2, triode Q3 and the full conducting of triode Q4, when controlling triode Q5, triode Q6, triode Q8 and triode Q7 contract fully, light-emitting diode D1, light-emitting diode D2, light-emitting diode D3 and light-emitting diode D4 are with series system work.Described CPU 11 is controlled series connection LED power source controller 13b simultaneously and is provided power supply for above-mentioned diode.At this moment backlight illumination shows evenly, is applicable to using under the display requirement condition with higher backlight.
When showing for backlight illumination under the even less demanding situation, by described CPU 11 control triode Q1, triode Q2, triode Q3, triode Q4 contract fully, during the full conducting of control triode Q5, triode Q6, triode Q8 and triode Q7, light-emitting diode D1, light-emitting diode D2, light-emitting diode D3 and light-emitting diode D4 are with parallel way work.Described CPU 11 is controlled LED power source controller 13a in parallel simultaneously and is provided power supply for above-mentioned diode.At this moment backlight circuit interference is little, noise is little, is applicable under the situation of noise control than strictness to circuit to use.
When for the lower occasion of display requirement, can realize lighting of part light-emitting diode by described CPU 11 control triodes.
Particularly, by described CPU 11 control triode Q1, triode Q2, triode Q3 and triode Q4 contract fully, when control triode Q5, triode Q6, triode Q8 and triode Q7 partly closed with conducting, corresponding light-emitting diode was lighted and is extinguished.
When controlling triode Q1, triode Q2, triode Q3 and triode Q4 contract fully by described CPU 11, when control triode Q5 closed, light-emitting diode D1 extinguished; If during control triode Q5 conducting, light-emitting diode D 1 lights.
When controlling triode Q1, triode Q2, triode Q3 and triode Q4 contract fully by described CPU 11, when control triode Q6 closed, light-emitting diode D2 extinguished; If during control triode Q6 conducting, light-emitting diode D2 lights.
When controlling triode Q1, triode Q2, triode Q3 and triode Q4 contract fully by described CPU 11, when control triode Q8 closed, light-emitting diode D3 extinguished; If during control triode Q8 conducting, light-emitting diode D3 lights.
When controlling triode Q1, triode Q2, triode Q3 and triode Q4 contract fully by described CPU 11, when control triode Q7 closed, light-emitting diode D4 extinguished; If during control triode Q7 conducting, light-emitting diode D4 lights.
So just go for the lower occasion of display requirement,, saved power consumption greatly owing to have only the part light-emitting diode to light.
Described light-emitting diode among first kind of embodiment of backlight control circuit described in the utility model can all adopt the superbright light-emitting diode, power-supply controller of electric can omit LED power source controller 13a in parallel, only adopts series connection LED power source controller 13b also can realize above-mentioned functions.
When the described superbright light-emitting diode of described central processing unit controls adopts series system to link to each other, described series connection LED power source controller 13b is according to described central processing unit controls information Control, for above-mentioned superbright light-emitting diode provides required operating voltage of the series system that adapts and operating current.
When the described superbright light-emitting diode of described central processing unit controls adopts parallel way to link to each other, described series connection LED power source controller 13b is according to described central processing unit controls information Control, for above-mentioned superbright light-emitting diode provides required operating voltage of the parallel way that adapts and operating current.
Referring to Fig. 3, this figure is second kind of embodiment physical circuit of backlight control circuit described in the utility model figure.
Second kind of embodiment of backlight control circuit described in the utility model, described power-supply controller of electric are specially series connection LED power source controller 13c; All light-emitting diodes all adopt the superbright light-emitting diode.
Second kind of embodiment physical circuit of backlight control circuit described in the utility model also comprises four light-emitting diodes, is specially light-emitting diode D11, light-emitting diode D12, light-emitting diode D13 and light-emitting diode D14.Above-mentioned four light-emitting diodes are connected on the two ends of series connection LED power source controller 13c.Series connection triode Q17 between light-emitting diode D11 and the light-emitting diode D12.Series connection triode Q18 between light-emitting diode D12 and the light-emitting diode D13.Series connection triode Q19 between light-emitting diode D13 and the light-emitting diode D14.Series connection triode Q13, triode Q12, triode Q 11 between light-emitting diode D14 and the series connection LED power source controller 13c, triode Q11 is connected between light-emitting diode D12 and the series connection LED power source controller 13c simultaneously, and triode Q12 is connected between triode Q11 and the light-emitting diode D13 simultaneously.The emitter of described light-emitting diode D11, light-emitting diode D12, light-emitting diode D13 links to each other with series connection LED power source controller 13c by triode Q14, triode Q15, triode Q16 respectively.
Same not shown CPU 11 among Fig. 3.It is all among Fig. 3 that triode--the control of triode Q11, triode Q12, triode Q13, triode Q14, triode Q15, triode Q16, triode Q18 and triode Q17 extremely all has the output of CPU 11 to link to each other.CPU 11 also links to each other with the control input end of series connection LED power source controller 13c.
Particularly, described CPU 11 is by the described control unit 12 of GPIO (general input/output port) control.Described CPU 11 can adopt control chip, and the control utmost point of above-mentioned triode and the control input end of described series connection LED power source controller 13c are connected the different output pins or the GPIO of described control chip respectively.
Described control chip is according to concrete control requirement, control the concrete control signal of different output pins or GPIO output, control closing or conducting of above-mentioned triode, control described series connection LED power source controller 13c simultaneously and provide the corresponding driving power supply, thereby realized the control of demonstration backlight for the above-mentioned light-emitting diode of conducting that needs.
When showing for backlight illumination under the situation of evenly having relatively high expectations, by described CPU 11 control triode Q11, triode Q12, triode Q 13, triode Q14, triode Q15 and triode Q16 contract fully, during the whole conducting of control triode Q17, triode Q18 and triode Q19, light-emitting diode D11, light-emitting diode D12, light-emitting diode D13 and light-emitting diode D14 are with series system work.Required operating voltage and operating current when the described series connection LED power source controller 13c of described CPU 11 controls provides series connection for above-mentioned light-emitting diode.At this moment backlight illumination shows evenly, is applicable to using under the display requirement condition with higher backlight.
When showing for backlight illumination under the even less demanding situation, by described CPU 11 control triode Q11, triode Q12, triode Q13, triode Q14, triode Q15 and the whole conductings of triode Q16, when control triode Q17, triode Q18 and triode Q19 contract fully, light-emitting diode D11, light-emitting diode D12, light-emitting diode D13 and light-emitting diode D14 are with parallel way work.Required operating voltage and operating current when the described series connection LED power source controller 13c of described CPU 11 controls provides parallel connection for above-mentioned light-emitting diode.At this moment backlight circuit interference is little, noise is little, is applicable under the situation of noise control than strictness to circuit to use.
Certain backlight control circuit described in the utility model can also be applicable to the switching of control mode between the light-emitting diode of other numbers.The utility model can also adopt other concrete circuit to realize above-mentioned control, is not described in detail in this.
The above only is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (8)
1, a kind of backlight control circuit, it is characterized in that, described circuit comprises CPU, the control unit that links to each other with described CPU, at least two light-emitting diodes, and the power-supply controller of electric that is used to drive described light-emitting diode that links to each other with CPU;
Described control unit receives the control information of described CPU, controls the conducting of each described light-emitting diode or closes according to described control information;
Described power-supply controller of electric links to each other with described light-emitting diode, is controlled to be operating current and the operating voltage that described light-emitting diode provides the described light-emitting diode with described control unit control to adapt according to the control information of described CPU.
2, backlight control circuit according to claim 1 is characterized in that, described control unit receives the control information of described CPU, switches the connected mode of the in parallel or series connection between the described light-emitting diode according to described control information.
3, backlight control circuit according to claim 2 is characterized in that, described control unit is specially the triode that links to each other with described light-emitting diode; The control utmost point of described triode links to each other with described CPU, described CPU by controlling described triode conducting or close the connected mode of switching between the described light-emitting diode.
4, backlight control circuit according to claim 3 is characterized in that, described power-supply controller of electric comprises LED power source controller in parallel and series connection LED power source controller;
Described CPU all links to each other with series connection LED power source controller with described LED power source controller in parallel, and described central processing unit controls provides connect LED power source controller or the LED power source controller in parallel that the serial or parallel connection mode adapts between the described light-emitting diode that switches with described control unit for described light-emitting diode.
5, backlight control circuit according to claim 4, it is characterized in that, described control unit is specially first triode that is connected between the described light-emitting diode, and is connected second triode between described first triode and the described LED power source controller in parallel; Described CPU by controlling described first triode and second triode conducting or close the connected mode of switching between the described light-emitting diode.
6, backlight control circuit according to claim 2 is characterized in that, described power-supply controller of electric is specially series connection LED power source controller; Described light-emitting diode is the superbright light-emitting diode;
Described CPU all links to each other with described series connection LED power source controller, the working power that connected mode adapts between the described light-emitting diode that the described series connection LED power source of described central processing unit controls controller provides for described light-emitting diode and described control unit switches.
7, backlight control circuit according to claim 6, it is characterized in that, described control unit is specially and is connected on each described light-emitting diode and described the 3rd triode of connecting between the LED power source controller, and be connected the 4th triode between the described light-emitting diode base stage and be connected described light-emitting diode base stage and another light-emitting diode emitter between the 5th triode;
Described CPU by controlling described the 3rd triode, the 4th triode and second triode conducting or close the connected mode of switching between the described light-emitting diode.
8, according to the arbitrary described backlight control circuit of claim 1 to 7, it is characterized in that described CPU is controlled described control unit by general input/output port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200740868U CN201119059Y (en) | 2007-08-22 | 2007-08-22 | A background light control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200740868U CN201119059Y (en) | 2007-08-22 | 2007-08-22 | A background light control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201119059Y true CN201119059Y (en) | 2008-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200740868U Expired - Fee Related CN201119059Y (en) | 2007-08-22 | 2007-08-22 | A background light control circuit |
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| CN (1) | CN201119059Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019137438A1 (en) * | 2018-01-15 | 2019-07-18 | 西安中兴新软件有限责任公司 | Terminal display adjustment circuit, device and method, and terminal |
-
2007
- 2007-08-22 CN CNU2007200740868U patent/CN201119059Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019137438A1 (en) * | 2018-01-15 | 2019-07-18 | 西安中兴新软件有限责任公司 | Terminal display adjustment circuit, device and method, and terminal |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080917 Termination date: 20110822 |