CN100419521C - Liquid crystal displaying device - Google Patents
Liquid crystal displaying device Download PDFInfo
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- CN100419521C CN100419521C CNB2005100363913A CN200510036391A CN100419521C CN 100419521 C CN100419521 C CN 100419521C CN B2005100363913 A CNB2005100363913 A CN B2005100363913A CN 200510036391 A CN200510036391 A CN 200510036391A CN 100419521 C CN100419521 C CN 100419521C
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- frequency
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Abstract
The related LCD comprises: a liquid crystal panel with a scanning drive IC and a data drive IC, a synchronous signal input terminal, a clock control circuit to provide clock control signal to the panel, a back light module with an inverter circuit and a V-A feedback circuit and a frequency feedback circuit and an inverter drive IC and a back light lamp, and a lock frequency circuit to receive synchronous signal and provide back light signal for the inverter drive IC. This invention can provide stable figure display.
Description
[technical field]
The present invention relates to a kind of LCD.
[background technology]
LCD has to be had frivolously, and therefore characteristics such as low power consumption and radiation are few are widely used in fields such as monitor, LCD TV, mobile phone and portable computer.Because the liquid crystal molecule itself in the LCD is not luminous, therefore LCD needs to show by the luminous image of realizing of a module backlight, and common module backlight comprises that a plurality of backlight lamp tubes, drive the circuit for reversing of backlight lamp tube and the pulse-width modulation integrated circuit of this backlight lamp tube operating voltage of adjusting and electric current.
Please refer to Fig. 1, is a kind of synoptic diagram of prior art LCD 100.This LCD 100 comprises a display panels 110, one synchronous signal input part 132, a clock control circuit 130, one module 150 backlight.
This display panels 110 comprises an one scan drive integrated circult 111 and a data-driven integrated circuit 112 that is used to drive this display panels 110.
This module 150 backlight comprises a circuit for reversing 152, an electric current and voltage feedback circuit 153, one inversion driving integrated circuit 155 and a backlight 156.
This clock control circuit 130 produces according to a synchronous signal that is provided by this synchronizing signal end 132 and provides a clock control signal to this turntable driving integrated circuit 111 and this data-driven integrated circuit 112.This inversion driving integrated circuit 155 is used to drive this circuit for reversing 152, this circuit for reversing 152 is produced have the backlight driving voltage of certain frequency to drive this backlight 156.This electric current and voltage feedback circuit 153 feeds back to this inversion driving integrated circuit 155 with the backlight driving voltage that this circuit for reversing 152 produces, and this inversion driving integrated circuit 155 can be regulated backlight driving voltage and the backlight drive electric current that this circuit for reversing 152 produces according to this feedback voltage.
In this display panels 110, this display panels 110 gets the image display frequency and can regulate within the specific limits, can be 50 hertz, 60 hertz, 70 hertz or 80 hertz usually.And the image display frequency of the frequency of the backlight driving voltage that this circuit for reversing 152 produces and this display panels 110 and asynchronous, so the image display frequency of the glow frequency of this 156 backlight lamp tube and this display panels 110 is asynchronous.This defective can produce the phenomenon that image shows flicker in the vision of human eye, influence the display quality of this LCD 100.
[summary of the invention]
In order to solve the problem that LCD image of the prior art shows flicker, be necessary to provide a kind of image to show stable LCD.
The disclosed a kind of LCD of one embodiment of the present invention comprises a display panels, a synchronous signal input part, a clock control circuit and a module backlight.This display panels comprises that an one scan drive integrated circult and a data-driven integrated circuit are used to drive this display panels, and this module backlight comprises a circuit for reversing, an electric current and voltage feedback circuit, a frequency feedback circuit, an inversion driving integrated circuit and a backlight.This clock control circuit produces according to a synchronous signal that is provided by this synchronous signal input end and provides a clock control signal to this turntable driving integrated circuit and this data-driven integrated circuit.This inversion driving integrated circuit is used to drive this circuit for reversing, this circuit for reversing is produced have the backlight driving voltage of certain frequency to drive this backlight.This electric current and voltage feedback circuit feeds back to this inversion driving integrated circuit with the backlight driving voltage that this circuit for reversing produces.This inversion driving integrated circuit comprises a frequency locking circuit, this frequency feedback circuit feeds back to this frequency locking circuit with the frequency signal of this backlight driving voltage, this frequency locking circuit receives this synchronizing signal simultaneously, and providing a synchronizing signal backlight according to this synchronizing signal that receives, this inversion driving integrated circuit drives this circuit for reversing according to this synchronizing signal backlight.
Compared to prior art, above-mentioned backlight liquid crystal display module further comprises a frequency locking circuit, this frequency locking circuit can realize that the display frequency of frequency that this backlight is luminous and this LCD is synchronous, thereby eliminate because the scintillation of the luminous frequency of backlight and the asynchronous appearance of display frequency of this LCD, LCD image demonstration therefore of the present invention is more stable.
[description of drawings]
Fig. 1 is the electrical block diagram of the LCD of prior art.
Fig. 2 is the synoptic diagram of first embodiment of the invention LCD.
Fig. 3 is the electrical block diagram of the frequency locking circuit in the LCD shown in Figure 2.
Fig. 4 is the synoptic diagram of second embodiment of the invention LCD.
[embodiment]
Please refer to Fig. 2, is the synoptic diagram of first embodiment of the invention LCD 200.This LCD 200 comprises a display panels 210, one synchronous signal input part 232, a clock control circuit 230, one module 250 backlight.
This display panels 210 comprises an one scan drive integrated circult 211 and a data-driven integrated circuit 212 that is used to drive this display panels 210.
This module 250 backlight comprises a circuit for reversing 252, an electric current and voltage feedback circuit 253, one frequency feedback circuit 254, an inversion driving integrated circuit 255, a backlight 256 and a frequency locking circuit 257.
The synchronous signal that this clock control circuit 230 provides according to this synchronous signal input end 232 produces and provides a clock control signal to this turntable driving integrated circuit 211 and this data-driven integrated circuit 212.
This frequency locking circuit 257 also receives this synchronizing signal that this synchronous signal input end 232 provides, and produces and provide a synchronizing signal backlight to this inversion driving integrated circuit 255 according to this synchronizing signal.This inversion driving integrated circuit 255 is used to drive this circuit for reversing 252, this circuit for reversing 252 is produced have the backlight driving voltage of certain frequency to drive this backlight 256.This electric current and voltage feedback circuit 253 feeds back to this inversion driving integrated circuit 255 with the backlight driving voltage that this circuit for reversing 252 produces, and this frequency feedback circuit 254 feeds back to this frequency locking circuit 257 with the frequency signal of this backlight driving voltage.
Please refer to Fig. 3, is the electrical block diagram of this frequency locking circuit 257 in this LCD 200.This frequency locking circuit 257 comprises a phase comparator 2571, one voltage controlled oscillators 2572 and a frequency divider 2573, and this frequency divider 2573 comprises frequency division setting end 2574.This frequency divider 2573 receives this frequency signal by this backlight driving voltage of these feedback circuit 254 feedbacks, this frequency divider 2573 is provided to this phase comparator 2571 with 1/N times of fractional frequency signal of this frequency signal then, this phase comparator 2571 relatively after the frequency of the frequency of this synchronizing signal of providing of this synchronous signal input end 232 and this 1/N times of fractional frequency signal output one adjust voltage, this adjustment voltage is provided to this voltage controlled oscillator 2572, makes this voltage controlled oscillator 2572 produce a synchronizing signal backlight and is provided to this inversion driving integrated circuit 255.Wherein, the frequency of this synchronizing signal backlight be the synchronous signal frequency that provides of this synchronous signal input end 232 N doubly, N is a positive integer, this frequency division is set the size that end 2574 is used to determine N value, common N can change between 1-20.
Compared to prior art, the module backlight 250 of above-mentioned LCD 200 further comprises a frequency locking circuit 257, this frequency locking circuit 257 can realize that the display frequency of frequency that this backlight 256 is luminous and this LCD 200 is synchronous, thereby eliminate because the scintillation of the luminous frequency of backlight 256 and the asynchronous appearance of display frequency of this LCD 200, LCD 200 images demonstration therefore of the present invention is more stable.
Please refer to Fig. 4, is the synoptic diagram of second embodiment of the invention LCD 300.This LCD 300 comprises a display panels 310, one synchronous signal input part 332, a clock control circuit 330, one module 350 backlight.
This display panels 310 comprises an one scan drive integrated circult 311 and a data-driven integrated circuit 312 that is used to drive this display panels 310.
This module 350 backlight comprises a circuit for reversing 352, electric current and voltage feedback circuit 353, one frequency feedback circuit, 354 1 inversion driving integrated circuit 355 and a backlight 356.This inversion driving integrated circuit 355 comprises a frequency locking circuit 3551, a ramp generator 3552, a controller 3553 and a pulse-width regulating device 3554.
The synchronous signal that this clock control circuit 330 provides according to this synchronous signal input end 332 produces and provides a clock control signal to this turntable driving integrated circuit 311 and this data-driven integrated circuit 312.
This frequency locking circuit 3551 also receives this synchronizing signal 332 that this synchronous signal input end 332 provides, and produce and provide a synchronizing signal backlight to this ramp generator 3552 according to this synchronizing signal, this ramp generator 3552 produces a pulse signal according to this synchronizing signal backlight that receives and imports this controller 3553, this controller 3553 is controlled this pulse-width regulating device 3554 according to this pulse signal, this pulse-width regulating device 3554 is used to drive this circuit for reversing 352, this circuit for reversing 352 is produced have the backlight driving voltage of certain frequency to drive this backlight 356.
This electric current and voltage feedback circuit 353 feeds back to this controller 3553 with the backlight driving voltage that this circuit for reversing 352 produces, and this controller 3553 is also controlled this pulse-width regulating device 3554 according to this backlight driving voltage that receives.
This frequency feedback circuit 354 feeds back to this frequency locking circuit 357 with the frequency signal of this backlight driving voltage, this frequency locking circuit 357 makes the frequency of this backlight driving voltage and the Frequency Synchronization of this synchronizing signal 332, and realizes that finally the display frequency of frequency that this backlight 356 is luminous and this LCD 300 is synchronous.Wherein, frequency locking circuit 257 shown in Figure 3 is identical in the internal circuit configuration of this frequency locking circuit 357 and first embodiment.
LCD of the present invention is not limited to above-mentioned embodiment, and for example: in the LCD 200 of first embodiment, this frequency locking circuit 257 not necessarily will receive the synchronizing signal that this synchronous signal input end 232 provides.Alternate embodiments as the first embodiment LCD 200, this frequency locking circuit 257 also can receive the clock control signal that this clock control circuit 230 produces, and provides a synchronizing signal backlight to this inversion driving integrated circuit 355 according to this clock control signal that receives.In the LCD 300 of second embodiment, this frequency locking circuit 3551 also not necessarily will receive the synchronizing signal that this synchronous signal input end 332 provides.Alternate embodiments as the LCD 300 of second embodiment, this frequency locking circuit 3551 can receive the clock control signal that this clock control circuit 330 produces, and provides a synchronizing signal backlight to this ramp generator 3552 according to this clock control signal that receives.
Compared to prior art, the module backlight 350 of above-mentioned LCD 300 further comprises a frequency locking circuit 3551, this frequency locking circuit 3551 can realize that the display frequency of frequency that this backlight 356 is luminous and this LCD 300 is synchronous, thereby eliminate because the scintillation of the luminous frequency of backlight 356 and the asynchronous appearance of display frequency of this LCD 300, LCD 300 images demonstration therefore of the present invention is more stable.
Claims (10)
1. LCD comprises:
One display panels comprises the one scan drive integrated circult and the data-driven integrated circuit that are used to drive this display panels;
One synchronous signal input part is used to provide a synchronous signal;
One clock control circuit produces a clock control signal according to the synchronizing signal that is provided by this synchronous signal input end, and this clock control signal is provided to this a turntable driving integrated circuit and a data-driven integrated circuit;
One module backlight, comprise a circuit for reversing, an electric current and voltage feedback circuit, an inversion driving integrated circuit and a backlight, this inversion driving integrated circuit is used to drive this circuit for reversing, the backlight driving voltage that this circuit for reversing is produced have certain frequency is to drive this backlight, and this electric current and voltage feedback circuit feeds back to this inversion driving integrated circuit with the backlight driving voltage that this circuit for reversing produces;
It is characterized in that: this inversion driving integrated circuit further comprises a frequency locking circuit, this module backlight further comprises a frequency feedback circuit, this frequency feedback circuit feeds back to this frequency locking circuit with the frequency signal of this backlight driving voltage, this frequency locking circuit receives this synchronizing signal that this synchronous signal input end provides simultaneously, and providing a synchronizing signal backlight according to this synchronizing signal that receives, this inversion driving integrated circuit drives this circuit for reversing according to this synchronizing signal backlight.
2. LCD as claimed in claim 1, it is characterized in that: this inversion driving integrated circuit further comprises a ramp generator, a controller and a pulse-width regulating device, this ramp generator receives this synchronizing signal backlight and produces a pulse signal imports this controller, this controller is controlled this pulse-width regulating device according to this pulse signal, and this pulse-width regulating device is used to drive this circuit for reversing.
3. LCD as claimed in claim 1, it is characterized in that: this frequency locking circuit comprises a phase comparator, one voltage controlled oscillator and a frequency divider, this frequency divider receives the frequency signal of this backlight driving voltage, and the fractional frequency signal of this frequency signal is provided to this phase comparator, voltage is adjusted in output one after the frequency of this synchronizing signal that this phase comparator comparison synchronous signal input end provides and the frequency of this fractional frequency signal, this adjustment voltage is provided to this voltage controlled oscillator, makes this voltage controlled oscillator produce a synchronizing signal backlight.
4. LCD as claimed in claim 3, it is characterized in that: this fractional frequency signal be this backlight driving voltage frequency signal 1/N doubly, the frequency of this synchronizing signal backlight be this synchronizing signal of providing of this synchronous signal input end frequency N doubly, N is a positive integer.
5. LCD as claimed in claim 4 is characterized in that: this frequency locking circuit further comprises frequency division setting end, and this frequency division is set the size that end is used to determine the N value.
6. LCD as claimed in claim 5 is characterized in that: N is the positive integer of 1-20.
7. LCD comprises:
One display panels comprises the one scan drive integrated circult and the data-driven integrated circuit that are used to drive this display panels;
One synchronous signal input part is used to provide a synchronous signal;
One clock control circuit produces a clock control signal according to a synchronous signal that is provided by this synchronous signal input end, and this clock control signal is provided to this a turntable driving integrated circuit and a data-driven integrated circuit;
One module backlight, this module backlight comprises a circuit for reversing, an electric current and voltage feedback circuit, an inversion driving integrated circuit and a backlight, this inversion driving integrated circuit is used to drive this circuit for reversing, the backlight driving voltage that this circuit for reversing is produced have certain frequency is to drive this backlight, and this electric current and voltage feedback circuit feeds back to this inversion driving integrated circuit with the backlight driving voltage that this circuit for reversing produces;
It is characterized in that: this inversion driving integrated circuit comprises a frequency locking circuit, this module backlight further comprises a frequency feedback circuit, this frequency feedback circuit feeds back to this frequency locking circuit with the frequency signal of this backlight driving voltage, this frequency locking circuit receives the clock control signal that this clock control circuit produces simultaneously, and providing a synchronizing signal backlight according to this clock control signal that receives, this inversion driving integrated circuit drives this circuit for reversing according to this synchronizing signal backlight.
8. LCD as claimed in claim 7, it is characterized in that: this inversion driving integrated circuit further comprises a ramp generator, a controller and a pulse-width regulating device, this ramp generator receives this synchronizing signal backlight and produces a pulse signal imports this controller, this controller is controlled this pulse-width regulating device according to this pulse signal, and this pulse-width regulating device is used to drive this circuit for reversing.
9. LCD as claimed in claim 7, it is characterized in that: this frequency locking circuit comprises a phase comparator, a voltage controlled oscillator and a frequency divider, this frequency divider receives the frequency signal of this backlight driving voltage, and the fractional frequency signal of this frequency signal is provided to this phase comparator, this phase comparator relatively after the frequency of the frequency of this synchronizing signal and this fractional frequency signal output one adjust voltage, this adjustment voltage is provided to this voltage controlled oscillator, makes this voltage controlled oscillator produce a synchronizing signal backlight.
10. LCD as claimed in claim 9, it is characterized in that: this fractional frequency signal be this backlight driving voltage frequency signal 1/N doubly, the frequency of this synchronizing signal backlight be this synchronizing signal of providing of this synchronous signal input end frequency N doubly, N is a positive integer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100363913A CN100419521C (en) | 2005-08-04 | 2005-08-04 | Liquid crystal displaying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100363913A CN100419521C (en) | 2005-08-04 | 2005-08-04 | Liquid crystal displaying device |
Publications (2)
| Publication Number | Publication Date |
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| CN1908752A CN1908752A (en) | 2007-02-07 |
| CN100419521C true CN100419521C (en) | 2008-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100363913A Expired - Fee Related CN100419521C (en) | 2005-08-04 | 2005-08-04 | Liquid crystal displaying device |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101415064B1 (en) * | 2007-12-11 | 2014-07-04 | 엘지디스플레이 주식회사 | Driving control apparatus and method for liquid crystal display device |
| JP5335653B2 (en) * | 2009-12-04 | 2013-11-06 | ミツミ電機株式会社 | Liquid crystal display device and liquid crystal display method |
| TW201519208A (en) * | 2013-11-01 | 2015-05-16 | Novatek Microelectronics Corp | Display driving device and method for driving display |
| CN104360185A (en) * | 2014-10-30 | 2015-02-18 | 惠州市创仕实业有限公司 | LCM (liquid crystal module) electric measurement function expansion device |
| CN106652919A (en) * | 2016-09-09 | 2017-05-10 | 青岛海信电器股份有限公司 | Image display method and display apparatus |
| CN108766369A (en) * | 2018-05-31 | 2018-11-06 | 联想(北京)有限公司 | A kind of display equipment and display control method |
| CN110379386B (en) * | 2019-06-11 | 2021-10-01 | 惠科股份有限公司 | Display panel and display |
| CN111429852B (en) * | 2020-04-20 | 2022-04-26 | 昆山龙腾光电股份有限公司 | Control circuit and control method of liquid crystal display and display device |
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| US20040160794A1 (en) * | 1999-07-22 | 2004-08-19 | Yung-Lin Lin | High-efficiency adaptive DC/AC converter |
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| CN1908752A (en) | 2007-02-07 |
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Granted publication date: 20080917 Termination date: 20170804 |