CN2862098Y - Liquid crystal back light circuit - Google Patents
Liquid crystal back light circuit Download PDFInfo
- Publication number
- CN2862098Y CN2862098Y CN 200520047525 CN200520047525U CN2862098Y CN 2862098 Y CN2862098 Y CN 2862098Y CN 200520047525 CN200520047525 CN 200520047525 CN 200520047525 U CN200520047525 U CN 200520047525U CN 2862098 Y CN2862098 Y CN 2862098Y
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- CN
- China
- Prior art keywords
- resistor
- links
- lcd
- liquid crystal
- led
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model provides a liquid crystal backlight circuit, which consists of comparator (A), liquid crystal display (LCD) module, light emitting diode (LED), resistor (R1-R4), potentiometer (W), photo transistor (T1), and triode (T2). The working status of the circuit is related with the strength of external light. When the light is strong, the backlight circuit can be switched off, so as to reduce electricity consumption, prolong the service life of battery and convenient users.
Description
Technical field
The utility model relates to lighting circuit, particularly a kind of LCD backlight circuit.
Background technology
The hand-held set of in-line viscometer adopts liquid crystal display, powered battery, be mounted with in the liquid crystal display light emitting diode produce backlight, to guarantee that liquid crystal can clear demonstration under the situation that externally light is darker.And existing hand-held set places normally on backlight circuit, even externally in the working environment that light is stronger, and backlight circuit conducting work in the same old way, consuming cells electric energy in vain shortened battery serviceable life, increased the inconvenience that the user frequently changes battery.
Summary of the invention
The utility model is for the normal conducting LCD backlight circuit that the solves existing in-line viscometer hand-held set existing technical matters of consumed power in vain, just and provide the LCD backlight circuit of the dark conducting of a kind of light.
According to above-mentioned purpose, the utility model provides a kind of LCD backlight circuit, is made up of comparer A, LCD MODULE LCD, LED, resistor R 1～R4, potentiometer W, phototriode T1, triode T2.
Wherein comparer A-input end links to each other with the emitter of phototriode T1, the stiff end of potentiometer W, its+input end links to each other with the link of resistor R 1, R2, its output terminal links to each other with an end of resistor R 3; Wherein the other end of the collector of phototriode T1, resistor R 1 links to each other with power vd D; The wherein grounded emitter of the other end of the movable end of potentiometer W, resistor R 2, triode T2; Wherein the base stage of triode T2 links to each other with the other end of resistor R 3, and its collector links to each other with an end of resistor R 4; Wherein the LA utmost point of LCD MODULE LCD links to each other with positive pole, the power vd D of LED, and its LK utmost point links to each other with the negative pole of LED, the other end of resistor R 4.
The utility model makes that the duty of LCD backlight circuit is relevant with the extraneous light power owing to adopted above technical measures, closes backlight circuit when light is strong, reduces power consumption, prolongation battery serviceable life, makes things convenient for the user.
Description of drawings
Accompanying drawing is a circuit diagram of the present utility model
Embodiment
As shown in drawings, voltage V1 be power vd D by the conducting resistance of phototriode T1 and the voltage that resistance distributed of potentiometer W, voltage V2 is the voltage that power vd D is distributed by resistor R 1 and resistor R 2.
If extraneous light weakens, then the conducting resistance of phototriode T1 increases, and voltage V1 reduces, and when V1＜V2, comparer A exports high level, triode T2 conducting, and also conducting work of backlight circuit, LED is luminous for the liquid crystal display interior light emitting diodes.
If extraneous light strengthens, then the conducting resistance of phototriode T1 reduces, and voltage V1 increases, when V1＞V2, and comparer A output low level, triode T2 ends, and backlight circuit is also closed, and liquid crystal display interior light emitting diodes LED extinguishes.
Wherein resistor R 4 is a current-limiting resistance, selects suitable resistance, and the luminosity that can determine LED is a liquid crystal backlight lighteness.Potentiometer W can initially adjust according to the concrete photoelectric characteristic of phototriode T1.In sum, this LCD backlight circuit can be followed the tracks of the variation of extraneous light intelligently, thereby conducting or close improves the utilization of power efficient of battery.
In the practical application, because the hand-held set of in-line viscometer mostly is operated in the stronger scene of light, so this LCD backlight control circuit has stronger Practical significance, adopt this circuit after, the battery service life of hand-held set has on average prolonged three times, has obtained effect preferably.
Claims (1)
1, a kind of LCD backlight circuit is characterized in that: be made up of comparer (A), LCD MODULE (LCD), light emitting diode (LED), resistor (R1)～(R4), potentiometer (W), phototriode (T1), triode (T2);
Wherein (-) input end of comparer (A) links to each other with the emitter of phototriode (T1), the stiff end of potentiometer (W), and its (+) input end links to each other with the link of resistor (R1), (R2), and its output terminal links to each other with an end of resistor (R3); Wherein the other end of the collector of phototriode (T1), resistor (R1) links to each other with power supply (VDD); The wherein grounded emitter of the other end of the movable end of potentiometer (W), resistor (R2), triode (T2); Wherein the base stage of triode (T2) links to each other with the other end of resistor (R3), and its collector links to each other with an end of resistor (R4); Wherein (LA) utmost point of LCD MODULE (LCD) links to each other with positive pole, the power supply (VDD) of light emitting diode (LED), and its (LK) utmost point links to each other with the negative pole of light emitting diode (LED), the other end of resistor (R4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520047525 CN2862098Y (en) | 2005-12-15 | 2005-12-15 | Liquid crystal back light circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520047525 CN2862098Y (en) | 2005-12-15 | 2005-12-15 | Liquid crystal back light circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2862098Y true CN2862098Y (en) | 2007-01-24 |
Family
ID=37659730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520047525 Expired - Fee Related CN2862098Y (en) | 2005-12-15 | 2005-12-15 | Liquid crystal back light circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2862098Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116976B (en) * | 2009-12-31 | 2012-10-31 | 北京京东方光电科技有限公司 | Active matrix substrate and manufacturing method thereof |
| CN103198806A (en) * | 2013-04-08 | 2013-07-10 | 北京京东方光电科技有限公司 | Photoactivity controller and display device for display device drive control |
-
2005
- 2005-12-15 CN CN 200520047525 patent/CN2862098Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116976B (en) * | 2009-12-31 | 2012-10-31 | 北京京东方光电科技有限公司 | Active matrix substrate and manufacturing method thereof |
| CN103198806A (en) * | 2013-04-08 | 2013-07-10 | 北京京东方光电科技有限公司 | Photoactivity controller and display device for display device drive control |
| CN103198806B (en) * | 2013-04-08 | 2016-03-23 | 北京京东方光电科技有限公司 | A kind of display device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070124 Termination date: 20100115 |