CN103839524A - Liquid crystal display, source drivers thereof and control method - Google Patents
Liquid crystal display, source drivers thereof and control method Download PDFInfo
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- CN103839524A CN103839524A CN201210474023.7A CN201210474023A CN103839524A CN 103839524 A CN103839524 A CN 103839524A CN 201210474023 A CN201210474023 A CN 201210474023A CN 103839524 A CN103839524 A CN 103839524A
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Abstract
The invention discloses a liquid crystal display which comprises a liquid crystal display panel which is used for displaying a display screen, a timing controller which is used for generating a polarity control signal and a latch signal, and a driving circuit which comprises a number of source drivers. Each source driver comprises a comparison unit which is used for comparing a shared electrode voltage with a first reference voltage and a second reference voltage to generate a comparison result, an enabling unit which is used for generating an enabling signal according to the comparison result, a source driving signal and a reset signal, a level point inversion control unit which is used for generating a level point inversion control signal according to the enabling signal, and a polarity control unit which is used for generating the polarity inversion control signal and the reset signal according to the enabling signal, the polarity control signal and the latch signal.
Description
Technical field
The present invention relates to a kind of liquid crystal display and driving circuit thereof and control method, espespecially a kind of by the mode of detecting shared electrode voltage, in good time liquid crystal display and driving circuit and the control method of switch drive mode.
Background technology
Liquid crystal display (liquid crystal display monitor, LCD monitor) have that external form is frivolous, power consumption is few and the characteristic such as radiationless pollution, be widely used on the information products such as computer system, mobile phone, personal digital assistant (personal digital assistant, PDA).The principle of work of liquid crystal display is to utilize liquid crystal molecule under different ordered states, light is had to different polarizations or refraction effect, therefore can control via the liquid crystal molecule of different ordered states the amount of penetrating of light, further produce the output light of varying strength, and the red, green, blue of different GTG intensity.Liquid crystal display is generally used time schedule controller (timing controller) to produce the data-signal that is relevant to show image, and drives required control signal and the frequency signal of display panels.The source electrode driver (source driver) of liquid crystal display is the driving signal with generation display panels according to data-signal, control signal and frequency signal again.
Generally speaking, the polarity of voltage that is applied to liquid crystal material layer two ends must reverse at set intervals, cause permanent destruction in order to avoid liquid crystal material to produce polarization, also in order to avoid image remaining (image sticking) effect, generally can use the modes such as picture reversion (frame inversion), line reversion (lineinversion) or some reversion (dot inversion) to drive liquid crystal display, therefore source electrode driver often need to repeat to discharge and recharge to provide the driving signal of opposed polarity.On the other hand, the output of time schedule controller also can be switched between logical one and logical zero.
Liquid crystal display can produce shared electrode voltage (common electrode voltage, Vcom) in the time of operation, and the generation of string shadow (crosstalk) phenomenon is relevant with shared electrode voltage.String shadow phenomenon is the phenomenon that in display panels, the picture in certain region has influence on adjacent domain brightness, and one of generation reason is that the stability of shared electrode voltage is not good.With regard to the liquid crystal display for TV purposes, the picture that display panels mainly shows is dynamic menu, is relatively difficult for producing string shadow phenomenon, and also therefore great majority there is no for string shadow phenomenon design solution for the liquid crystal display of TV purposes now.And with regard to the liquid crystal display for intelligent TV purposes, liquid crystal display can show more tableaux, the chance that the shadow phenomenon of therefore going here and there produces will significantly improve.
Solve the problem that liquid crystal display produces string shadow phenomenon, mainly can pass through two kinds of modes, wherein one be to stablize shared electrode voltage.But with regard to large scale liquid crystal display, the load of its shared electrode voltage is excessive, and be difficult to do for shared electrode voltage the control of back coupling compensation voltage stabilizing.
Solve the another kind of method of liquid crystal display generation string shadow phenomenon problem for changing its type of drive by time schedule controller detecting custom design.The existing known liquid crystal display utilization of industry is detected custom design in display frame and switch drive mode, to get rid of the generation of string shadow phenomenon.
Please refer to Fig. 1, Fig. 1 is the schematic diagram of a known liquid crystal display 10.Liquid crystal display 10 includes a display panels 100, time schedule controller 102 and one drive circuit 104.Display panels 100 is used for display frame, and it is to be made up of two substrates (Substrate), and between two substrates, is filled with liquid crystal material (LCD layer).Time schedule controller 102 is used for producing the data-signal that is relevant to show image, and drives required control signal and the frequency signal of display panels 100, i.e. a polarity control signal POL and a latch-up signal LD.On the another detecting display panels 100 of time schedule controller 102, the custom design of display frame, is detecting after custom design, sends level point reverse control signal H2DOT, and the type of drive that changes display panels 100 is 2 inversion driving modes of level.Driving circuit 104 includes multiple source electrode driver SD_1～SD_i, the signal transmitting according to time schedule controller 102 produces respectively corresponding driving signal, be used for changing the arrangement of liquid crystal molecule in display panels 100 and corresponding light penetration amount, so that image data is presented on display panels 100.
Please continue to refer to Fig. 2, Fig. 2 is the schematic diagram of known one source pole driver 20.Source electrode driver 20 is source electrode driver SD_1～SD_i in representative graph 1, includes level point reversion control module 200 and an output unit 202.Level point reversion control module 200, in the time of the custom design detecting in display frame, produces a level point reverse control signal H2DOT, and then the type of drive of switching output unit 202 is 2 inversion driving modes of level.Output unit 202 is coupled to level point reversion control module 200, is used for, according to level point reverse control signal H2DOT, polarity control signal POL and latch-up signal LD, adjusting its type of drive.
Known liquid crystal display 10 can be detected various custom designs, judges whether the generation of string shadow phenomenon.For instance, please refer to Fig. 3 A, Fig. 3 A is the schematic diagram of a custom design 300A in a display frame 30A.Custom design 300A is made up of 8 transom pixels (sub-pixel) and 7 dark sub-pixel cross arrangements, that is to say all there is a dark sub-pixel between every two transom pixels.As long as time schedule controller 102 detects in display frame 30A and has custom design 300A, produce level point reverse control signal H2DOT, type of drive is switched to 2 inversion driving modes of level.On the other hand, above-mentioned 8 transom pixels and 7 dark sub-pixels dispersible in same display frame.As shown in Figure 3 B, custom design 300B is that 8 transom pixels and 7 dark sub-pixels are dispersed on display frame 30B.Similarly, have custom design 300B if time schedule controller 102 detects in display frame 30B, produce level point reverse control signal H2DOT, type of drive is switched to 2 inversion driving modes of level.
But with regard to large scale liquid crystal display, because picture disply area is larger, the custom design that detecting causes picture to produce string shadow phenomenon will become difficulty.Taking Fig. 3 B as example, if transom pixel is too being disperseed with the distribution of dark sub-pixel, time schedule controller must being close to of scanning display frame all just can detect custom design, causes detecting custom design to be difficult for, and may cause reducing the quality of picture disply.
Summary of the invention
Therefore, the invention provides a kind of liquid crystal display and driving circuit thereof and control method, it can be by the method for detecting shared electrode voltage, detecting shared electrode overtension or when too low, switch drive mode in good time, to stablize shared electrode voltage, avoid shared electrode variation in voltage excessive and produce string shadow phenomenon, maintain picture disply quality.
The present invention discloses a kind of liquid crystal display, includes a display panels, is used for showing a display frame; Time schedule controller, is used for producing a polarity control signal and a latch-up signal; And one drive circuit, include multiple source electrode drivers, one first reference voltage and one second reference voltage; Wherein, each source electrode driver of the plurality of source electrode driver includes a comparing unit, in order to share electrode voltage and one first reference voltage and one second reference voltage comparison by one, to produce a comparative result; One activation unit, is coupled to this comparing unit, is used for driving signal and a reset signal according to this comparative result, one source pole, produces an enable signal; One level point reversion control module, is coupled to this activation unit, is used for according to this enable signal, produces a level point reverse control signal; And a Polarity Control unit, be coupled to this activation unit, be used for according to this enable signal, this polarity control signal and this latch-up signal, produce a reversal of poles control signal and this reset signal; Wherein, this level point reverse control signal and this reversal of poles control signal are by a type of drive that decides this liquid crystal display; Wherein, this first reference voltage is higher than this second reference voltage.
The present invention also discloses a kind of source electrode driver for a liquid crystal display, includes a comparing unit, in order to share electrode voltage and one first reference voltage and one second reference voltage comparison by one, to produce a comparative result; One activation unit, is coupled to this comparing unit, is used for driving signal and a reset signal according to this comparative result, one source pole, produces an enable signal; One level point reversion control module, is coupled to this activation unit, is used for according to this enable signal, produces a level point reverse control signal; And a Polarity Control unit, be coupled to this activation unit, be used for according to this enable signal, a polarity control signal and a latch-up signal, produce a reversal of poles control signal and this reset signal; Wherein, this level point reverse control signal and this reversal of poles control signal are by a type of drive that decides this liquid crystal display; Wherein, this first reference voltage is higher than this second reference voltage.
The present invention also discloses a kind of control method for a liquid crystal display, includes by shared electrode voltage and one first reference voltage and an one second reference voltage comparison, to produce a comparative result; Drive signal and a reset signal according to this comparative result, one source pole, produce an enable signal; According to this enable signal, produce a level point reverse control signal; And according to this enable signal, a polarity control signal and a latch-up signal, produce a reversal of poles control signal and this reset signal; Wherein, this level point reverse control signal and this reversal of poles control signal are by a type of drive that decides this liquid crystal display; Wherein, this first reference voltage is higher than this second reference voltage.
Coordinate detailed description and claims of following diagram, embodiment at this, by address other object of the present invention and advantage and be specified in after.
Brief description of the drawings
Fig. 1 is the schematic diagram of a known liquid crystal display.
Fig. 2 is the schematic diagram of known one source pole driver.
Fig. 3 A is the schematic diagram of a custom design in a display frame.
Fig. 3 B is the schematic diagram of a custom design in a display frame.
Fig. 4 is the schematic diagram of the embodiment of the present invention one liquid crystal display.
Fig. 5 is the schematic diagram of embodiment of the present invention one source pole driver.
Fig. 6 is the schematic diagram of activation unit in Fig. 5.
Fig. 7 is the schematic diagram of Fig. 5 Semi-polarity control module.
Fig. 8 is the schematic diagram of the embodiment of the present invention one type of drive switching flow.
Fig. 9 A is the schematic diagram of 2 inversion driving modes of embodiment of the present invention level.
Fig. 9 B is the schematic diagram of 2 inversion driving modes of embodiment of the present invention level in conjunction with vertical 1+N point (N=2) inversion driving mode.
Fig. 9 C is the schematic diagram of 2 inversion driving modes of embodiment of the present invention level in conjunction with vertical N point (N=3) inversion driving mode.
Fig. 9 D is the schematic diagram of 2 inversion driving modes of embodiment of the present invention level in conjunction with vertical N+M point (N=2 and M=3) inversion driving mode.
Figure 10 is the sequential chart of coherent signal in source electrode driver in Fig. 5.
Figure 11 is the schematic diagram of the embodiment of the present invention one control flow.
Wherein, description of reference numerals is as follows:
10,40 liquid crystal display
100,400 display panels
102,402 time schedule controllers
104,404 driving circuits
20,50, SD_1～SD_i source electrode driver
200,504 level point reversion control modules
202,508 output units
30A, 30B display frame
300A, 300B custom design
500 comparing units
502 activation unit
506 Polarity Control unit
602 logical blocks
604 source drive signaling control units
700 counting units
702 frequency elimination unit
704 multi-task units
80,110 flow processs
800,802,804,806,808,1100,1102, step
1104、1106、1108
VCOM shared electrode voltage
Vref1, Vref2 reference voltage
ENB enable signal
POL polarity control signal
POL1 frequency elimination signal
POL2 reversal of poles control signal
LD latch-up signal
CD source drive signal
H2DOT level point reverse control signal
RST reset signal
COMP comparative result
Embodiment
Please refer to Fig. 4, Fig. 4 is the schematic diagram of the embodiment of the present invention one liquid crystal display 40.Liquid crystal display 40 includes a display panels 400, time schedule controller 402 and one drive circuit 404.The effect of display panels 400 and time schedule controller 402 is identical with known display panels 100 and time schedule controller 102 respectively, therefore be not repeated herein.Driving circuit 404 includes multiple source electrode driver SD_1～SD_i, reference voltage Vref 1 and Vref2.Each source electrode driver SD_1～SD_i is used for detecting the shared electrode voltage VCOM of display panels 400, and shared electrode voltage VCOM and reference voltage Vref 1, Vref2 are compared, to determine whether change type of drive.Each source electrode driver SD_1～SD_i exports or accepts one source pole and drives signal CD, to inform whether itself and system change type of drive.
Please continue to refer to Fig. 5, Fig. 5 is the schematic diagram of embodiment of the present invention one source pole driver 50.Source electrode driver 50 is source electrode driver SD_1～SD_i in representative graph 4, includes a comparing unit 500, an activation unit 502, level point reversion control module 504, a Polarity Control unit 506 and an output unit 508.Comparing unit 500 comparison shared electrode voltage VCOM and reference voltage Vref 1, Vref2, to produce a comparative result COMP.Wherein, reference voltage Vref 1 is higher than reference voltage Vref 2.Activation unit 502 drives signal CD according to comparative result COMP, a reset signal RST and one source pole, produces an enable signal ENB.Level point reversion control module 504 is coupled to activation unit 502, is used for according to enable signal ENB, produces a level point reverse control signal H2DOT, and then controls the output state of output unit 508.Polarity Control unit 506 is coupled to activation unit 502, be used for according to enable signal ENB, polarity control signal POL and latch-up signal LD, produce a reversal of poles control signal POL2 and reset signal RST, to control respectively the output state of output unit 508 and the enable signal ENB of activation unit 502.Output unit 508 is coupled to level point reversion control module 504 and Polarity Control unit 506, is used for, according to level point reverse control signal H2DOT, reversal of poles control signal POL2 and latch-up signal LD, adjusting its output state.
Embodiments possible about activation unit 502 in Fig. 5 is asked for an interview Fig. 6.In Fig. 6, activation unit 502 includes a logical block 602 and one source pole drives signaling control unit 604.Source drive signaling control unit 604 is used to provide source drive signal.Logical block 602 is used for logical operation comparative result COMP, source drive signal CD and reset signal RST, to produce enable signal ENB and a logical signal CDX.Source drive signaling control unit 604 is coupled to logical block 602, is used for the logical signal CDX that produces according to logical block 602, controls source drive signal CD high levle or low level state.
Embodiments possible about Fig. 5 Semi-polarity control module 506 is asked for an interview Fig. 7.In Fig. 7, Polarity Control unit 506 includes a counting unit 700, a frequency elimination unit 702 and a multi-task unit 704.Counting unit 700 is used for according to enable signal ENB and polarity control signal POL, statistics one count value, and in the time that count value arrives a default value, switch drive mode is a normal hurdle inversion driving mode, the design value of laying equal stress on.Frequency elimination unit 702 is by polarity control signal POL and latch-up signal LD frequency elimination, to produce frequency elimination signal POL1.Multi-task unit 704 is coupled to frequency elimination unit 702, is used for coming multitasking polarity control signal POL and frequency elimination signal POL1 according to enable signal ENB, with polarization reverse control signal POL2.
Please refer to Fig. 8, Fig. 8 is the schematic diagram of the embodiment of the present invention one type of drive switching flow 80.Whether type of drive switching flow 80 is too high or too low for detecting shared electrode voltage VCOM, includes the following step:
Step 800: start.
Step 802: judge that whether shared electrode voltage VCOM is higher than reference voltage Vref 1 or lower than reference voltage Vref 2.If so, carry out step 804; Otherwise, carry out step 808.
Step 804: switch drive mode, makes it at least include 2 inversion driving modes of level.
Step 806: apply mechanically the type of drive of switching at several pictures.
Step 808: switch drive mode is normal hurdle inversion driving mode.
According to type of drive switching flow 80, first, comparing unit 500 is detected shared electrode voltage VCOM, and judges that whether shared electrode voltage VCOM is higher than reference voltage Vref 1 or lower than reference voltage Vref 2.If shared electrode voltage VCOM is higher than reference voltage Vref 1, or shared electrode voltage VCOM is lower than reference voltage Vref 2, and switch drive mode is at least including 2 inversion driving modes of level.Preferably, be 2 inversion driving modes of level or 2 vertical inversion driving modes of inversion driving modes combination of level through the type of drive of switching.In the present invention, vertical inversion driving mode includes vertical N point reversion (vertical N dot inversion) type of drive, vertical 1+N point reversion (vertical 1+N dotinversion) type of drive and vertical N+M point (vertical N+M dot inversion) type of drive of reversing, wherein M be not less than 3 and N be not less than 2.2 inversion driving modes of level are controlled generation by level point reversion control module 504, and vertical inversion driving mode is controlled generation by Polarity Control unit 506.That is to say, the reversal of poles control signal POL2 that the level point reverse control signal H2DOT that level point reversion control module 504 produces produces with Polarity Control unit 506 is that 2 inversion driving modes of level, 2 inversion driving modes of level are combined vertical N point inversion driving mode, 2 inversion driving modes of level in conjunction with vertical 1+N point inversion driving mode or 2 vertical N+M point inversion driving modes of inversion driving modes combination of level with deciding type of drive.Output unit 508 is controlled display panels 400 according to level point reverse control signal H2DOT and reversal of poles control signal POL2, makes display panels 400 in follow-up several picture displies, uses the type of drive of switching.After above-mentioned steps is carried out, type of drive is switched back original type of drive, namely normal hurdle inversion driving mode, and restart to carry out the detecting of shared electrode voltage VCOM.
On the contrary, if shared electrode voltage VCOM between reference voltage Vref 1 and Vref2, type of drive is maintained normal hurdle inversion driving mode, and continues to carry out the detecting of shared electrode voltage VCOM.
Please refer to Fig. 9 A to Fig. 9 D, Fig. 9 A to Fig. 9 D is respectively 2 inversion driving modes of embodiment of the present invention level, 2 vertical 1+N point (N=2) inversion driving modes of inversion driving modes combination of level, 2 inversion driving modes of level in conjunction with vertical N point (N=3) inversion driving modes and the vertically schematic diagram of N+M point (N=2 and M=3) inversion driving modes collocation zigzagpixel (Flip-pixel) panels of 2 inversion driving modes combinations of level.Liquid crystal display 40 can select to switch to one of above-mentioned type of drive.Note that Fig. 9 A to Fig. 9 D is the example of the type of drive of switching.Main spirits of the present invention, is to detect shared electrode voltage higher than reference voltage Vref 1 or lower than after reference voltage Vref 2, and switch drive mode, reduces the variation of shared electrode voltage, to eliminate string shadow phenomenon.Therefore, any type of drive of detecting the switching of shared electrode voltage method according to the present invention, all belongs to category of the present invention.
Please refer to Figure 10, Figure 10 is the sequential chart of coherent signal in source electrode driver 50 in Fig. 5.As shown in Figure 10, detecting shared electrode voltage VCOM higher than reference voltage Vref 1 or after lower than reference voltage Vref 2, it is low level that activation unit 502 switches source drive signal CD, enable signal ENB thereby switch to low level.Level point reverse control signal H2DOT switches to low level according to enable signal, represents that type of drive switches to 2 inversion driving modes of level.Figure 10 is taking vertical 2 inversion driving modes as example, according to latch-up signal LD, polarity control signal POL and enable signal ENB in Figure 10, reversal of poles control signal is after switch drive mode, in during polarity control signal POL maintains same level, POL2 presents the waveform that includes two LD pulse waves, is used for informing that type of drive includes vertical 2 inversion driving modes.Therefore,, in Figure 10, the type of drive of switching is that 2 inversion driving modes of level are in conjunction with vertical 2 inversion driving modes.After several (L) picture, enable signal ENB replys as high levle, level point reverse control signal H2DOT and reversal of poles control signal POL2 are replied according to this as high levle, type of drive is switched back to normal hurdle inversion driving mode, and restart detecting and whether shared electrode voltage VCOM occurs higher than reference voltage Vref 1 or lower than the situation of reference voltage Vref 2.
The above-mentioned function mode about source electrode driver SD_1～SD_i switch drive mode in liquid crystal display 40, can further be summarized as a control flow 110, as shown in figure 11.Control flow 110 includes following steps:
Step 1100: by shared electrode voltage Vcom and reference voltage Vref 1, Vref2 comparison, to produce comparative result COMP.
Step 1102: according to comparative result COMP, source drive signal CD and reset signal RST, produce enable signal ENB.
Step 1104: according to enable signal ENB, produce level point reverse control signal H2DOT.
Step 1106: according to enable signal ENB, polarity control signal POL and a latch-up signal LD, polarization reverse control signal POL2 and reset signal RST.
Step 1108: according to level point reverse control signal H2DOT and reversal of poles control signal POL2, determine a type of drive of liquid crystal display 40.
Known liquid crystal display is by the mode of detecting custom design, and have custom design in detecting display frame time, switch drive mode, to get rid of the generation of string shadow phenomenon.But in the time that the above-mentioned mode by detecting custom design is applied to large scale liquid crystal display, because picture disply area is larger, the custom design that detecting causes picture to produce string shadow phenomenon will become difficulty.In comparison, liquid crystal display of the present invention is by the mode of detecting shared electrode voltage, and at shared electrode overtension or when too low, switch drive mode in good time, to stablize shared electrode voltage, avoids shared electrode variation in voltage excessive and produce string shadow phenomenon.The mode liquid crystal display that the present invention detects shared electrode voltage is not subject to the impact of liquid crystal display size, can be applicable on large scale liquid crystal display.
In sum, liquid crystal display of the present invention is by the mode of detecting shared electrode voltage, detecting shared electrode overtension or when too low, switch drive mode in time, to stablize shared electrode voltage, avoid shared electrode variation in voltage excessive and produce string shadow phenomenon, maintain picture disply quality.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (34)
1. a liquid crystal display, is characterized in that, includes:
One display panels, is used for showing a display frame;
Time schedule controller, is used for producing a polarity control signal and a latch-up signal; And
One drive circuit, includes multiple source electrode drivers, one first reference voltage and one second reference voltage;
Wherein, each source electrode driver of the plurality of source electrode driver includes:
One comparing unit, in order to share electrode voltage and this first reference voltage and this second reference voltage comparison by one, to produce a comparative result;
One activation unit, is coupled to this comparing unit, is used for driving signal and a reset signal according to this comparative result, one source pole, produces an enable signal;
One level point reversion control module, is coupled to this activation unit, is used for according to this enable signal, produces a level point reverse control signal; And
One Polarity Control unit, is coupled to this activation unit, is used for according to this enable signal, this polarity control signal and this latch-up signal, produces a reversal of poles control signal and this reset signal;
Wherein, this level point reverse control signal and this reversal of poles control signal are with deciding a type of drive;
Wherein, this first reference voltage is higher than this second reference voltage.
2. liquid crystal display as claimed in claim 1, is characterized in that, at this shared electrode voltage, during higher than this first reference voltage or lower than this second reference voltage, this type of drive switches to one first inversion driving mode.
3. liquid crystal display as claimed in claim 2, is characterized in that, this first inversion driving mode is 2 inversion driving modes of a level.
4. liquid crystal display as claimed in claim 2, is characterized in that, this first inversion driving mode be 2 inversion driving modes of a level in conjunction with a vertical N point inversion driving mode, and N is not less than 2.
5. liquid crystal display as claimed in claim 2, is characterized in that, this first inversion driving mode be 2 inversion driving modes of a level in conjunction with a vertical 1+N point inversion driving mode, and N is not less than 2.
6. liquid crystal display as claimed in claim 2, is characterized in that, this first inversion driving mode be 2 inversion driving modes of a level in conjunction with a vertical N+M point inversion driving mode, and M be not less than 3 and N be not less than 2.
7. liquid crystal display as claimed in claim 1, is characterized in that, at this shared electrode voltage, during lower than this first reference voltage and higher than this second reference voltage, this type of drive switches to one second inversion driving mode.
8. liquid crystal display as claimed in claim 7, is characterized in that, this second inversion driving mode is a normal hurdle inversion driving mode.
9. liquid crystal display as claimed in claim 1, is characterized in that, this activation unit includes:
One logical block, is used for this comparative result of logical operation, this source drive signal and this reset signal, to produce this enable signal and a logical signal; And
One source pole drives signaling control unit, is coupled to this logical block, is used for according to this logical signal, controls the state of this source drive signal high levle or low level.
10. liquid crystal display as claimed in claim 1, is characterized in that, this Polarity Control unit includes:
One counting unit, is used for adding up a count value according to this enable signal and this reversal of poles control signal, and in the time that this count value arrives a default value, switching this type of drive is a normal hurdle inversion driving mode, and resets this count value;
One frequency elimination unit, in order to by this polarity control signal and this latch-up signal frequency elimination, to produce a frequency elimination signal; And
One multi-task unit, is coupled to this frequency elimination unit, is used for this enable signal of multitasking, this polarity control signal and this frequency elimination signal, to produce this reversal of poles control signal.
11. liquid crystal display as claimed in claim 1, is characterized in that, also include:
One output unit, is coupled to this level point reversion control module and this Polarity Control unit, is used for exporting a picture signal according to this type of drive.
12. 1 kinds of source electrode drivers for a liquid crystal display, is characterized in that, include:
One comparing unit, in order to share electrode voltage and one first reference voltage and one second reference voltage comparison by one, to produce a comparative result;
One activation unit, is coupled to this comparing unit, is used for driving signal and a reset signal according to this comparative result, one source pole, produces an enable signal;
One level point reversion control module, is coupled to this activation unit, is used for according to this enable signal, produces a level point reverse control signal; And
One Polarity Control unit, is coupled to this activation unit, is used for according to this enable signal, a polarity control signal and a latch-up signal, produces a reversal of poles control signal and this reset signal;
Wherein, this level point reverse control signal and this reversal of poles control signal are by a type of drive that decides this liquid crystal display;
Wherein, this first reference voltage is higher than this second reference voltage.
13. driving circuits as claimed in claim 12, is characterized in that, at this shared electrode voltage, during higher than this first reference voltage or lower than this second reference voltage, this type of drive switches to one first inversion driving mode.
14. driving circuits as claimed in claim 13, is characterized in that, this first inversion driving mode is 2 inversion driving modes of a level.
15. driving circuits as claimed in claim 13, is characterized in that, this first inversion driving mode be 2 inversion driving modes of a level in conjunction with a vertical N point inversion driving mode, and N is not less than 2.
16. driving circuits as claimed in claim 13, is characterized in that, this first inversion driving mode be 2 inversion driving modes of a level in conjunction with a vertical 1+N point inversion driving mode, and N is not less than 2.
17. driving circuits as claimed in claim 13, is characterized in that, this first inversion driving mode be 2 inversion driving modes of a level in conjunction with a vertical N+M point inversion driving mode, and M be not less than 3 and N be not less than 2.
18. driving circuits as claimed in claim 12, is characterized in that, at this shared electrode voltage, during lower than this first reference voltage and higher than this second reference voltage, this type of drive switches to one second inversion driving mode.
19. driving circuits as claimed in claim 18, is characterized in that, this second inversion driving mode is a normal hurdle inversion driving mode.
20. driving circuits as claimed in claim 12, is characterized in that, this activation unit includes:
One logical block, is used for this comparative result of logical operation, this source drive signal and this reset signal, to produce this enable signal and a logical signal; And
One source pole drives signaling control unit, is coupled to this transistor and this logical block, is used for according to this logical signal, controls the state of this source drive signal high levle or low level.
21. driving circuits as claimed in claim 12, is characterized in that, this Polarity Control unit includes:
One counting unit, is used for adding up a count value according to this enable signal and this polarity control signal, and in the time that this count value arrives a default value, switching this type of drive is a normal columns inversion driving mode, and resets this count value;
One frequency elimination unit, in order to by this polarity control signal and this latch-up signal frequency elimination, to produce a frequency elimination signal; And
One multi-task unit, is coupled to this frequency elimination unit, is used for this enable signal of multitasking, this polarity control signal and this frequency elimination signal, to produce this reversal of poles control signal.
22. driving circuits as claimed in claim 12, is characterized in that, also include:
One output unit, is coupled to this level point reversion control module and this Polarity Control unit, is used for according to this type of drive, and output one picture signal.
23. driving circuits as claimed in claim 12, is characterized in that, this polarity control signal and this latch-up signal are produced by time schedule controller.
24. 1 kinds of control methods for a liquid crystal display, is characterized in that, include:
By shared electrode voltage and one first reference voltage and an one second reference voltage comparison, to produce a comparative result;
Drive signal and a reset signal according to this comparative result, one source pole, produce an enable signal;
According to this enable signal, produce a level point reverse control signal;
According to this enable signal, a polarity control signal and a latch-up signal, produce a reversal of poles control signal and this reset signal; And
According to this level point reverse control signal and this reversal of poles control signal, determine a type of drive of this liquid crystal display;
Wherein, this first reference voltage is higher than this second reference voltage.
25. as the control method of claim 24, it is characterized in that, at this shared electrode voltage, during higher than this first reference voltage or lower than this second reference voltage, this type of drive switches to one first inversion driving mode.
26. as the control method of claim 25, it is characterized in that, this first inversion driving mode is 2 inversion driving modes of a level.
27. as the control method of claim 25, it is characterized in that, this first inversion driving mode be 2 inversion driving modes of a level in conjunction with a vertical N point inversion driving mode, and N is not less than 2.
28. as the control method of claim 25, it is characterized in that, this first inversion driving mode be 2 inversion driving modes of a level in conjunction with a vertical 1+N point inversion driving mode, and N is not less than 2.
29. as the control method of claim 25, it is characterized in that, this first inversion driving mode be 2 inversion driving modes of a level in conjunction with a vertical N+M point inversion driving mode, and M be not less than 3 and N be not less than 2.
30. as the control method of claim 24, it is characterized in that, at this shared electrode voltage, during lower than this first reference voltage and higher than this second reference voltage, this type of drive switches to one second inversion driving mode.
31. as the control method of claim 30, it is characterized in that, this second inversion driving mode is a normal hurdle inversion driving mode.
32. as the control method of claim 24, it is characterized in that, also includes:
Add up a count value according to this enable signal and this polarity control signal, and in the time that this count value arrives a default value, switching this type of drive is a normal hurdle inversion driving mode, and resets this count value;
By this polarity control signal and this latch-up signal frequency elimination, to produce a frequency elimination signal; And this enable signal of multitasking, this polarity control signal and this frequency elimination signal, to produce this reversal of poles control signal.
33. as the control method of claim 24, it is characterized in that, also comprises according to this type of drive output one picture signal.
34. as the control method of claim 24, it is characterized in that, this polarity control signal and this latch-up signal are produced by time schedule controller.
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