CN1431644A - Driving circuit of liquid crystal display device - Google Patents
Driving circuit of liquid crystal display device Download PDFInfo
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- CN1431644A CN1431644A CN 02100975 CN02100975A CN1431644A CN 1431644 A CN1431644 A CN 1431644A CN 02100975 CN02100975 CN 02100975 CN 02100975 A CN02100975 A CN 02100975A CN 1431644 A CN1431644 A CN 1431644A
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Abstract
The invention relates to a drive circuit of a liquid crystal display device, which comprises a drive unit and a voltage transformation unit, wherein when the liquid crystal display device needs to drive a plurality of groups of inverters in work, the drive unit can send out drive voltage in an asynchronous mode to drive the voltage transformation unit, and the voltage transformation unit amplifies and converts the drive voltage and then transmits the amplified drive voltage to a lamp tube, so that the aim of driving the liquid crystal display device in different time sequences in the same working period is fulfilled. The invention only needs one driving component to generate the driving signal, and each group of Cold Cathode Fluorescent Lamps (CCFL) needs to be matched with one driving component, thereby having the advantages of reducing the cost of parts and further reducing the using space of the circuit so as to be beneficial to the circuit design. The invention can be widely applied to the field of liquid crystal display.
Description
Technical field
The present invention relates to a kind of driving circuit, particularly relate to a kind of LCD drive circuits that is applied to.
Background technology
Along with development of electronic technology and universal, the interfacing equipment of signal conditioning package is constantly progressive the lifting along with the function of signal conditioning package, with the display device is example, the past display device is by filament heated cathode emitting electrons, after quickening and focusing on, form electron beam, and after getting to electron beam on the screen, produce cathode-ray tube display (the Cathode Ray Tube Monitor of luminous point or electric signal; CRTMonitor), develop into the display device of today, the shaft-like quartzy molecule (rod-shaped crystal molecule) that can change direction when promptly being subjected to the function of current comes LCD (the Liquid Crystal Display Module of display message; LCM).
Common LCD can be divided into: twisted nematic liquid crystal display (Twisted Nematic-LCD; TN-LCD), super twisted nematic liquid crystal display (Super TN-LCD; STN-LCD), double layers super twisted nematic LCD (Double layer STN-LCD; DSTN-LCD) and Thin Film Transistor-LCD (Thin Film Transistor-LCD; Kind such as TFT-LCD), but in the process of liquid crystal indicator (LCM) work, usually because must drive many group converters (Inverter) simultaneously, to keep many group cold cathode fluorescent lamp (Cold Cathode Fluorescent Lamp in the same work period; CCFL) work, but the power that work is consumed as this liquid crystal indicator (LCM) also doubles.
In sum, for driving many group converters (Inverter) simultaneously, organize the work of cold cathode fluorescent lamps (CCFL), and can reduce power consumption to keep, real is technical task to be solved more.
Summary of the invention
Problem to be solved by this invention provides a kind of LCD drive circuits, is used to reduce the power that liquid crystal indicator (LCM) work is consumed.
This LCD drive circuits includes driver element and voltage transformation unit, when liquid crystal indicator needs to drive many group reversers (Inverter) in work, can send driving voltage to drive voltage transformation unit with asynchronous system by driver element, and be sent to fluorescent tube after by voltage transformation unit driving voltage being amplified conversion, to reach the purpose that drives liquid crystal indicators (LCM) in the same work period with different sequential.
In order to realize the purpose of foregoing invention, the invention provides a kind of LCD drive circuits, this liquid crystal indicator is provided with many group fluorescent tubes, and this liquid crystal indicator drives in a work period and should organize fluorescent tubes more, and this LCD drive circuits includes:
One driver element, this driver element is used to receive this work period, and should work period computing in addition, and after computing is finished with a plurality of driving voltages with asynchronous system, in this work period, should be sent to output terminal by a plurality of driving voltages; And
One voltage transformation unit, this voltage transformation unit and this driver element join, this voltage transformation unit is in order to receiving this a plurality of driving voltages, and should a plurality of driving voltages amplified and change after be sent to and organize fluorescent tubes this more, for the usefulness of this liquid crystal indicator work.
Described driver element includes:
Driven unit, this driven unit is used to receive this work period, and should work period computing in addition, and produces a plurality of drive signals with asynchronous system be sent to first output terminal and second output terminal after computing is finished;
First changeover module, this first changeover module and first output terminal join, in order to this drive signal switched to this driving voltage and to be sent to output terminal; And
Second changeover module, this second changeover module and second output terminal join, in order to this drive signal switched to this driving voltage and to be sent to output terminal.
Described voltage transformation unit includes:
First amplifier module, this first amplifier module and first changeover module join, in order to amplify this driving voltage and to be sent to output terminal;
Second amplifier module, this second amplifier module and this second changeover module join, in order to amplify this driving voltage and to be sent to output terminal;
First transition components, this first transition components and this first amplifier module join, in order to change this driving voltage and to be sent to this fluorescent tube; And
Second transition components, this second transition components and this second amplifier module join, in order to change this driving voltage and to be sent to this fluorescent tube.
Described fluorescent tube is a cold cathode fluorescent lamp (CCFL).
Described driven unit is a control integrated circuit (Control IC).
Described first amplifier module is a metal oxide semiconductcor field effect transistor (MOSFET).
Described second amplifier module is a metal oxide semiconductcor field effect transistor (MOSFET).
Described first transition components is a transformer (Transformer).
Described second transition components is a transformer (Transformer).
LCD drive circuits of the present invention, in the work period, use asynchronous type of drive, its advantage is effectively to reduce liquid crystal indicator power consumption at work, and the present invention only needs a driven unit to produce drive signal, each more common group cold cathode fluorescent lamp (CCFL) needs to cooperate a driven unit, have more the advantage that reduces cost of parts, and the usage space that more can further dwindle circuit, with convenient circuit design.
Description of drawings
Fig. 1 is a block synoptic diagram of the present invention (1);
Fig. 2 is system's block synoptic diagram of the present invention (2);
Fig. 3 is a signal timing diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is described further:
The present invention is a kind of LCD drive circuits, is arranged in the liquid crystal indicator (LCM), referring to Fig. 1:
LCD drive circuits, be to utilize asynchronous system to drive the driving circuit of many group fluorescent tubes, fluorescent tube is the cold cathode fluorescent lamp (CCFL) of a liquid crystal indicator (LCM), LCD drive circuits includes driver element 10 and voltage transformation unit 20 at least, driver element 10 is used to receive a work period T, work period T is cold cathode fluorescent lamp (CCFL) work period of a liquid crystal indicator (LCM), when driver element 10 when receiving this work period T, then to this work period T computing in addition, and after finishing, computing produces a plurality of driving voltages in asynchronous mode, and within this work period T, a plurality of driving voltages are sent to voltage transformation unit 20, and voltage transformation unit 20 is after receiving these a plurality of driving voltages, then this driving voltage is amplified and changed, be sent to the cold cathode fluorescent lamp (CCFL) of liquid crystal indicator (LCM), work for liquid crystal indicator (LCM).
The driver element 10 of LCD drive circuits includes driven unit 11, first changeover module 12 and second changeover module 13, and this driven unit 11 can be a control integrated circuit (Control Integrated Circuit; Control IC), after receiving this work period T, with work period T according to the in addition computing of the number of this liquid crystal indicator (LCM) cold cathode fluorescent lamp (CCFL), and produce drive signal and (suppose that a work period is 180 °, if this liquid crystal indicator (LCM) has two groups of cold cathode fluorescent lamps (CCFL), 11 of this driven units produce a drive signal in per 90 °) be sent to first changeover module 12 and second changeover module 13, first changeover module 12 and second changeover module 13 switch to driving voltage with this drive signal and are sent to voltage transformation unit 20 respectively at after receiving drive signal.
Next with regard to present embodiment, will drive cold cathode fluorescent lamp (CCFL) sequential and do an explanation, referring to Fig. 3.
LCD drive circuits, in order to reduce power consumption, be designed to asynchronous type of drive, suppose that this liquid crystal indicator (LCM) has two groups of cold cathode fluorescent lamps (CCFL), when driven unit 11 when receiving work period T, number according to cold cathode fluorescent lamp (CCFL), in this work period T, send two drive signals, form the first operating voltage T1 and the second operating voltage T2, and the generation time of this first operating voltage T1 and the second operating voltage T2 is separated, to reach asynchronous type of drive.
In sum, LCD drive circuits of the present invention, in the work period, use asynchronous type of drive, its advantage is effectively to reduce liquid crystal indicator power consumption at work, and the present invention only needs a driven unit to produce drive signal, and each more common group cold cathode fluorescent lamp (CCFL) needs to cooperate a driven unit, has more the advantage that reduces cost of parts, and more can further dwindle the usage space of circuit, with convenient circuit design.
Though the present invention is open with above-mentioned preferred embodiment, so be not that any those skilled in the art without departing from the spirit and scope of the invention, do some changes and change, belong to protection scope of the present invention in order to qualification the present invention.Protection scope of the present invention should be as the criterion with the scope that claims claim is defined.
Claims (9)
1. LCD drive circuits, this liquid crystal indicator are provided with many group fluorescent tubes, and this liquid crystal indicator drives in a work period and should organize fluorescent tubes more, and this LCD drive circuits includes:
One driver element, this driver element is used to receive this work period, and should work period computing in addition, and after computing is finished with a plurality of driving voltages with asynchronous system, in this work period, should be sent to output terminal by a plurality of driving voltages; And
One voltage transformation unit, this voltage transformation unit and this driver element join, this voltage transformation unit is in order to receiving this a plurality of driving voltages, and should a plurality of driving voltages amplified and change after be sent to and organize fluorescent tubes this more, for the usefulness of this liquid crystal indicator work.
2. LCD drive circuits according to claim 1 is characterized in that described driver element includes:
Driven unit, this driven unit is used to receive this work period, and should work period computing in addition, and produces a plurality of drive signals with asynchronous system be sent to first output terminal and second output terminal after computing is finished;
First changeover module, this first changeover module and first output terminal join, in order to this drive signal switched to this driving voltage and to be sent to output terminal; And
Second changeover module, this second changeover module and second output terminal join, in order to this drive signal switched to this driving voltage and to be sent to output terminal.
3. LCD drive circuits according to claim 1 is characterized in that described voltage transformation unit includes:
First amplifier module, this first amplifier module and first changeover module join, in order to amplify this driving voltage and to be sent to output terminal;
Second amplifier module, this second amplifier module and this second changeover module join, in order to amplify this driving voltage and to be sent to output terminal;
First transition components, this first transition components and this first amplifier module join, in order to change this driving voltage and to be sent to this fluorescent tube; And
Second transition components, this second transition components and this second amplifier module join, in order to change this driving voltage and to be sent to this fluorescent tube.
4. LCD drive circuits according to claim 1 is characterized in that described fluorescent tube is a cold cathode fluorescent lamp.
5. as LCD drive circuits as described in the claim 2, it is characterized in that described driven unit is a control integrated circuit.
6. as LCD drive circuits as described in the claim 3, it is characterized in that described first amplifier module is a metal oxide semiconductcor field effect transistor.
7. as LCD drive circuits as described in the claim 3, it is characterized in that described second amplifier module is a metal oxide semiconductcor field effect transistor.
8. as LCD drive circuits as described in the claim 3, it is characterized in that described first transition components is a transformer.
9. as LCD drive circuits as described in the claim 3, it is characterized in that described second transition components is a transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02100975 CN1431644A (en) | 2002-01-10 | 2002-01-10 | Driving circuit of liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02100975 CN1431644A (en) | 2002-01-10 | 2002-01-10 | Driving circuit of liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1431644A true CN1431644A (en) | 2003-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02100975 Pending CN1431644A (en) | 2002-01-10 | 2002-01-10 | Driving circuit of liquid crystal display device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100359382C (en) * | 2004-04-14 | 2008-01-02 | Lg.菲利浦Lcd株式会社 | Fluorescent lamp driving unit and driving method thereof |
| CN1941058B (en) * | 2005-09-26 | 2010-11-03 | 瑞萨电子株式会社 | Display control/driving device and display system |
| WO2022082909A1 (en) * | 2020-10-21 | 2022-04-28 | Tcl华星光电技术有限公司 | Display panel and display device |
-
2002
- 2002-01-10 CN CN 02100975 patent/CN1431644A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100359382C (en) * | 2004-04-14 | 2008-01-02 | Lg.菲利浦Lcd株式会社 | Fluorescent lamp driving unit and driving method thereof |
| US7362059B2 (en) | 2004-04-14 | 2008-04-22 | Lg.Philips Lcd Co., Ltd. | Driving unit of fluorescent lamp and method for driving the same |
| CN1941058B (en) * | 2005-09-26 | 2010-11-03 | 瑞萨电子株式会社 | Display control/driving device and display system |
| WO2022082909A1 (en) * | 2020-10-21 | 2022-04-28 | Tcl华星光电技术有限公司 | Display panel and display device |
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