CN202189539U - Adaptive adjustment LED (light-emitting diode) backlight circuit - Google Patents
Adaptive adjustment LED (light-emitting diode) backlight circuit Download PDFInfo
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- CN202189539U CN202189539U CN2011203272103U CN201120327210U CN202189539U CN 202189539 U CN202189539 U CN 202189539U CN 2011203272103 U CN2011203272103 U CN 2011203272103U CN 201120327210 U CN201120327210 U CN 201120327210U CN 202189539 U CN202189539 U CN 202189539U
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Abstract
The utility model provides an adaptive adjustment LED (light-emitting diode) backlight circuit used for portable electronic equipment, which comprises a photosensor for sensing the ambient brightness of the portable electronic equipment, an adjustment control circuit for obtaining the brightness control data according to the ambient brightness of the portable electronic equipment, an LED driving circuit for adjusting the driving current according to the brightness control data and LEDs used as a backlight source of a liquid crystal display of the portable electronic equipment for emitting light based on the driving current. Therefore, the brightness of the display screen of the portable equipment can be adjusted adaptively according to the ambient brightness and good user experience can be brought to the users.
Description
[technical field]
The utility model relates to a kind of backlight circuit field, particularly relates to a kind of LED (Light-emitting diode, light emitting diode) backlight circuit of self-adaptation adjustment.
[background technology]
Along with the fast development of LED, LED has been applied in the various fields, and is backlight etc. such as lighting, vehicle light illumination, LCD display.
Present electronic equipment all has display mostly, such as touch-screen smart mobile phone, notebook computer, panel computer, PDA(Personal Digital Assistant) etc.These equipment generally all can use under various applied environments, such as under the strong daylight, under the indoor light or in the black night.When under high light, using, possibly cause the displaying contents on the display screen not clear, and under darker environment during use, it is very bright that the displaying contents on the display screen may seem because external environment condition is brighter.
Therefore, be necessary to propose a kind of improved technical scheme and solve the problems referred to above.
[utility model content]
One of purpose of the utility model is to provide a kind of LED-backlit circuit of self-adaptation adjustment, and it can adjust the brightness of LED backlight according to ambient brightness.
To achieve these goals; An aspect according to the utility model; The utility model proposes a kind of LED backlight circuit that is used for the self-adaptation adjustment of portable electric appts; It is characterized in that it comprises: respond to the brightness of the residing environment of said portable electric appts light sensor, according to the brightness of the residing environment of said portable electric appts obtain luminance control data the adjustment control circuit, according to said luminance control data adjust drive current LED driving circuit and as the backlight liquid crystal display light source of said portable electric appts based on the luminous light emitting diode of said drive current.
Further, said light sensor is photoresistance.
Further, said LED driving circuit comprises reference current unit, a plurality of current drives pipe and efferent duct.Said reference current unit provides reference current, and it has offset side.The source electrode of each current drives pipe connects mutually and ground connection; Drain electrode all connects mutually; Grid all links to each other through the offset side of an on-off circuit with said reference current unit, and bias voltage on the said offset side drives each current drives pipe makes it produce drive current, according to the conducting of said each on-off circuit of luminance control data control or end; The drain electrode of said efferent duct links to each other with output terminal; Source electrode links to each other with the drain electrode of said current drives pipe, and said output terminal links to each other with an end of said light emitting diode, the drive current that the drive current that flows through on the said light emitting diode equals to flow through on each current drives pipe with.
Compared with prior art; The LED-backlit circuit of the self-adaptation adjustment that the utility model proposes; Brightness through light sensor induction external environment condition; And adjust the brightness of LED backlight in view of the above, thus changed the display brightness of display, make things convenient for the user under various environment, can both see displaying contents clearly.
[description of drawings]
In order to be illustrated more clearly in the technical scheme of the utility model embodiment; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.Wherein:
Fig. 1 is the LED-backlit circuit structured flowchart in one embodiment of self-adaptation adjustment in the utility model; With
Fig. 2 is the led drive circuit circuit diagram in one embodiment among Fig. 1.
[embodiment]
Below in conjunction with accompanying drawing and embodiment the utility model is further described.
N can be for greater than 2 natural number among this paper, a plurality of expressions two or more.Connection in the literary composition, speech such as join all are appreciated that to be to connect indirectly or directly.
The LED-backlit circuit circuit diagram in one embodiment that Fig. 1 adjusts for the self-adaptation that is used for portable electric appts in the utility model.The LED-backlit circuit 100 of said self-adaptation adjustment comprises light sensor 110, adjustment control circuit 120, led drive circuit 130 and as a plurality of LED140 of the back light of LCD (the Liquid Crystal Display) display of this portable electric appts.
The brightness of the residing environment of the said light sensor 110 said portable electric appts of induction.Said light sensor 110 can be photoresistance, phototriode etc.Said adjustment control circuit 120 obtains the luminance control data of LED according to the brightness of the residing environment of said portable electric appts, and the luminance control data of said LED is offered said led drive circuit 130.Said led drive circuit 130 provides drive current for said LED140, and said LED140 thinks that based on the driven for emitting lights of said led drive circuit 130 said LCD display provides backlight.Said led drive circuit 130 is adjusted said drive current according to said luminance control data, changes brightness thereby control said LED140, and then changes the display brightness of the LCD display of said portable electric appts.So just can realize bringing good user experience to the user according to the brightness of the display screen of the adaptive adjustment portable set of ambient brightness.
Fig. 2 is led drive circuit 130 circuit diagram in one embodiment among Fig. 1.Said led drive circuit 130 comprises reference current unit 131, current drives pipe M1-M6 and efferent duct M7.
Said reference current unit 131 provides reference current, and it has offset side.
The source electrode of each among the current drives pipe M1-M6 connects mutually and ground connection, and drain electrode all connects mutually, and grid all links to each other through the offset side of an on-off circuit with said reference current unit 131.Bias voltage on the said offset side drives each current drives pipe M1-M6 makes it produce drive current.
The ratio of the breadth length ratio of current drives pipe M1-M6 is 1: 2: 4: 8: 16: 32, the current ratio that flows through current drives pipe M1-M6 like this was respectively 1: 2: 4 equally: 8: 16: 32.Current drives pipe M1-M6 corresponding switch circuit control end is by 6 digit current data (the brightness adjustment control data) control of said regulation and control control circuit 120 outputs, and wherein said 6 digit current data are exactly the brightness adjustment control data in this embodiment of said regulation and control control circuit 120 outputs.Promptly according to the conducting and the shutoff of 6 these on-off circuits of digit current Data Control, thereby control conducting and the shutoff of each current drives pipe M1-M6, and then realize drive current is adjusted.
The drain electrode of said efferent duct M7 links to each other with output terminal OUT, and source electrode links to each other with the drain electrode of current drives pipe M1-M6.The grid of said efferent duct M7 is as the switch control end and 1 output enable Data Control being exported by said regulation and control control circuit 120 of said efferent duct M7; Promptly according to conducting and the shutoff of the said efferent duct M7 of this output enable Data Control, thereby realize the control of output enable.
Said output terminal OUT links to each other with the end of LED140, the drive current that the electric current that flows through on the said LED equals to flow through on the current drives pipe M1-M6 with, can realize control through the electric current on the Control current driving tube M1-M6 to the electric current that flows through on the LED140.
Above-mentioned explanation has fully disclosed the embodiment of the utility model.It is pointed out that any change that the technician that is familiar with this field does the embodiment of the utility model does not all break away from the scope of claims of the utility model.Correspondingly, the scope of the claim of the utility model also is not limited only to previous embodiment.
Claims (3)
1. the LED backlight circuit of a self-adaptation adjustment that is used for portable electric appts; It is characterized in that it comprises: respond to the brightness of the residing environment of said portable electric appts light sensor, according to the brightness of the residing environment of said portable electric appts obtain luminance control data the adjustment control circuit, according to said luminance control data adjust drive current LED driving circuit and as the backlight liquid crystal display light source of said portable electric appts based on the luminous light emitting diode of said drive current.
2. circuit according to claim 1 is characterized in that: said light sensor is photoresistance.
3. circuit according to claim 1 is characterized in that: said LED driving circuit comprises reference current unit, a plurality of current drives pipe and efferent duct,
Said reference current unit provides reference current; It has offset side; The source electrode of each current drives pipe connects mutually and ground connection, and drain electrode all connects mutually, and grid all links to each other through the offset side of an on-off circuit with said reference current unit; Bias voltage on the said offset side drives each current drives pipe makes it produce drive current; According to the conducting of each on-off circuit of said luminance control data control or end, the drain electrode of said efferent duct links to each other with output terminal, and source electrode links to each other with the drain electrode of said current drives pipe; Said output terminal links to each other with an end of said light emitting diode, the drive current that the drive current that flows through on the said light emitting diode equals to flow through on each current drives pipe with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203272103U CN202189539U (en) | 2011-08-24 | 2011-08-24 | Adaptive adjustment LED (light-emitting diode) backlight circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203272103U CN202189539U (en) | 2011-08-24 | 2011-08-24 | Adaptive adjustment LED (light-emitting diode) backlight circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202189539U true CN202189539U (en) | 2012-04-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203272103U Expired - Fee Related CN202189539U (en) | 2011-08-24 | 2011-08-24 | Adaptive adjustment LED (light-emitting diode) backlight circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN202189539U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103220421A (en) * | 2013-04-03 | 2013-07-24 | 广东欧珀移动通信有限公司 | Method and device for using mobile terminal to carry out self photographing |
| WO2019080306A1 (en) * | 2017-10-26 | 2019-05-02 | 惠科股份有限公司 | Display system and current driving method thereof |
| WO2019080308A1 (en) * | 2017-10-26 | 2019-05-02 | 惠科股份有限公司 | Display system and current driving method |
| CN115691432A (en) * | 2022-09-16 | 2023-02-03 | 荣耀终端有限公司 | Electronic equipment, backlight module and liquid crystal display |
-
2011
- 2011-08-24 CN CN2011203272103U patent/CN202189539U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103220421A (en) * | 2013-04-03 | 2013-07-24 | 广东欧珀移动通信有限公司 | Method and device for using mobile terminal to carry out self photographing |
| WO2019080306A1 (en) * | 2017-10-26 | 2019-05-02 | 惠科股份有限公司 | Display system and current driving method thereof |
| WO2019080308A1 (en) * | 2017-10-26 | 2019-05-02 | 惠科股份有限公司 | Display system and current driving method |
| CN115691432A (en) * | 2022-09-16 | 2023-02-03 | 荣耀终端有限公司 | Electronic equipment, backlight module and liquid crystal display |
| CN115691432B (en) * | 2022-09-16 | 2023-09-29 | 荣耀终端有限公司 | Electronic equipment, backlight module and liquid crystal display |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20120411 Termination date: 20140824 |
|
| EXPY | Termination of patent right or utility model |