CN100428325C - Source circuit and method for driving liquid crystal display device - Google Patents
Source circuit and method for driving liquid crystal display device Download PDFInfo
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- CN100428325C CN100428325C CNB2005100930660A CN200510093066A CN100428325C CN 100428325 C CN100428325 C CN 100428325C CN B2005100930660 A CNB2005100930660 A CN B2005100930660A CN 200510093066 A CN200510093066 A CN 200510093066A CN 100428325 C CN100428325 C CN 100428325C
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Abstract
The invention relates to a source driving circuit and driving method of liquid crystal display, wherein said driving circuit is formed by several groups of source drivers; each group comprises two data buffers, two digit/analogue converters, two amplifiers, one switch module and two plug units. The invention uses plug unit to directly supply the plug voltage needed in plug process, without using digit/analogue converter and amplifier to generate plug voltage, to accelerate the driving speed of source driving circuit and reduce the energy consumption of amplifier.
Description
Technical field
(liquid crystal display, LCD) technology are a kind of source electrode drive circuit (source driver circuit) and driving method of LCD concretely to the present invention relates to LCD.
Background technology
Figure 1A is the framework calcspar of an available liquid crystal display.With reference to Figure 1A, LCD 100 comprises a LCD panel (panel) 110, one source pole driving circuit 120, a grid (gate) driving circuit 130, time schedule controller (timing controller) 140 and one gamma adjustment (gamma adjustment) circuit 150.LCD panel 110 is to be interwoven by crisscross data line 121 and sweep trace 131 in order to show image.Wherein, a thin film transistor (TFT) (thin film transistor) 111 and one storage capacitors (capacitor) 112 all is set near the point of crossing of each data line 121 and sweep trace 131.Storage capacitors 112 is made up of pixel electrode (pixel electrode) 112a, common electrode (common electrode) 112b and liquid crystal layer 112c.The grid of thin film transistor (TFT) 111 is connected to sweep trace 131, and source electrode is connected to data line 121, and drain electrode is connected to the pixel electrode 112a of storage capacitors 112.Gamma is adjusted circuit 150 and applies at least one reference voltage to source electrode drive circuit 120, and time schedule controller 140 produces different control signals and controls voltage to source electrode drive circuit 120 and gate driver circuit 130.
If liquid crystal material is continued to impose a direct current voltage, liquid crystal material can be undermined.In the industry cycle, be that anti-kind situation here takes place, the polarity of the data-signal that is added in liquid crystal layer 112c of generally can periodically reversing is called AC driving (AC driving).
Figure 1B is the framework calcspar of an existing source electrode drive circuit.With reference to Figure 1B, source electrode drive circuit 120 is made up of many groups source electrode driver 160, each group source electrode driver comprise two data impact dampers 161,161 ', on the occasion of digital analog converter 162, a negative value digital analog converter 163, on the occasion of amplifier 164, a negative value amplifier 165 and four switch modules 166 that switch SW 1～SW4 is constituted.Based on the reason of above-mentioned AC driving, source electrode driver 160 receives two-digit signal of video signal D1, D2 respectively, simultaneously, receives from gamma and adjusts one group of positive analog voltage signal V that circuit 150 is sent
Ref1With one group of negative analog voltage signal V
Ref2After this two-digit signal of video signal D1, D2 carried out digital-to-analogue conversion and amplify, by controlling four switch SW 1～SW4, promptly alternately just simulating a signal of video signal and a negative analog signal of video signal from driver output end S1, S2 output one every a Preset Time.Four switch SW 1～SW4 are by control signal CS_SW control, and control signal CS_SW comprises first switch controlling signal, second switch control signal, the 3rd switch controlling signal, comes gauge tap SW1～SW4 respectively with the 4th switch controlling signal.Method as for control signal CS_SW gauge tap SW1～SW4 is prior art, no longer repeat specification.
LCD has the problem of image residue (afterimage) when showing animation (motion picture), this is because the reaction velocity of liquid crystal material is slow, the reaction time is long.When the object fast moving in the picture, in the process of a picture of scanning, the track that liquid crystal material can't the real-time tracing object.Opposite, liquid crystal material produced is the accumulation reaction of sweep time of several pictures.Because the specific properties of liquid crystal material, for solving its image residue problem, existing considerable research report is suggested, mainly contain following three solution party to.(1) inwardness (intrinsic property): liquid crystal essence is changed into low stickiness (low viscosity), (2) strengthen and to reverse voltage (over driving): liquid crystal is reversed faster and reply, (3) insert complete black picture (blackinsertion, hereinafter to be referred as black plug): after each image frame has shown, before next image frame shows, insert a complete black picture.
Fig. 2 A is presented in the available liquid crystal display, and each scanning-line signal is fed into the sequential chart of each sweep trace in regular turn.In the 6th, 473, No. 077 patent documentation of the U.S., IBM Corporation utilizes the notion of black plug to propose a kind of LCD, and Fig. 2 B is fed into each sweep signal the sequential chart of each sweep trace in regular turn for its gate driver circuit 130.In addition, based on identical black plug notion, in the 6th, 819, No. 311 patent documentations of the U.S., NEC Corporation also discloses a kind of LCD of suitable demonstration animation, and Fig. 2 C is fed into each sweep signal the sequential chart of each sweep trace in regular turn for its gate driver circuit 130.
Can find with reference to figure 2A, Fig. 2 B and Fig. 2 C, has only a pulse TG at the grid control signal of every sweep trace of Fig. 2 A sweep time at each picture, and in Fig. 2 B and Fig. 2 C, the grid control signal of every sweep trace but has two pulse T1 and T2 sweep time at each picture.
Comparison diagram 2A, Fig. 2 B, Fig. 2 C, the time that the demonstration LCD among Fig. 2 B will scan an image frame originally is divided into 2 half, and half still is used for the image output data, and second half then is used for the complete black picture of output.And Fig. 2 C shows that gate driver circuit 130 is under the prerequisite of a fixed number sweep trace of being separated by, and scanning the mode that promptly scans a complete black pixel line behind the image pixel line (pixel line), interlacing, is presented on the display.Identical is, the pulse width of sweep signal on the sweep trace 131 (impulse width) is kept to TG/2 by TG originally equally, just the sweep frequency of gate driver circuit 103 increases to two times, that is the time of grid action is reduced to 1/2, simultaneously, also to need to cooperate the sweep velocity of gate driver circuit 130 to accelerate be two times to the data-driven speed of source electrode drive circuit 120.
Though, the framework of NEC and IBM has solved the problem of image residue, but in order to implement black insertion technology, not only source electrode drive circuit must produce image data and full black data in turn, that is, no matter be image data or black plug data, these data produce black plug voltage by digital analog converter in the source electrode drive circuit and amplifier.Simultaneously, because digital analog converter and amplifier must produce black plug voltage and data drive voltage at different time, therefore the sweep frequency of gate driver circuit 130 also must double, make the load of source electrode driver greatly increase, and the reaction velocity of the digital analog converter of source electrode driver also must relative improve.
Summary of the invention
Because the problems referred to above, fundamental purpose of the present invention is for providing a kind of source electrode drive circuit of LCD, and the source electrode drive circuit of this LCD is directly adjusted circuit by gamma the complete black required black plug voltage of pixel is provided.
Another object of the present invention provides a kind of source electrode drive circuit of LCD, and the source electrode drive circuit of this LCD is directly adjusted circuit by gamma the complete black required black plug voltage of pixel is provided, and sweep frequency must not double.
For reaching above-mentioned purpose, the invention provides: a kind of source electrode drive circuit of LCD, it is characterized in that, formed by many groups source electrode driver, after receiving two digital image signals, each group source electrode driver exports one first drive signal and one second drive signal, and each gate drive signal has one first triggered time and one second triggered time in the scan period of each picture, this source electrode driver comprises: two data impact dampers receive described two-digit signal of video signal respectively; The two-digit analog converter receives the output data of described two data impact dampers respectively, and respectively according to two groups with reference to analog voltage signal, the data that received are converted to two analog image signals; Two amplifiers receive the output analog image signal of described digital analog converter respectively, and this analog image signal are amplified the back export one first amplifying signal and one second amplifying signal; One switch module receives described first and second amplifying signal, and in described first triggered time two amplifying signals is output as described first drive signal and second drive signal; One first black plug unit receives one first black plug voltage and one second black plug voltage, and in described second triggered time first black plug voltage or the second black plug voltage is output as described first drive signal; One second black plug unit receives the described first black plug voltage and the second black plug voltage, and in described second triggered time first black plug voltage or the second black plug voltage is output as described second drive signal; And one gamma adjust circuit, this gamma is adjusted circuit and is used for producing described first black plug voltage and the described second black plug voltage in the described black plug unit, and described with reference to analog voltage signal.
The present invention also provides: a kind of source driving method of display panels, it is characterized in that, be provided with crisscross many data lines and multi-strip scanning line on the display panels, every sweep trace has one first triggered time and one second triggered time in the scan period of each picture, this source driving method comprises the following step: actuation step, in described first triggered time, a plurality of digital image signals are converted to the analog image signal also export described many data lines to after the amplification; And the black plug step, in described second triggered time, directly export two different black plug voltages to described many data lines according to polarity; Wherein said black plug voltage is adjusted circuit by a gamma of display panels and is provided.
The present invention also provides: a kind of source electrode drive circuit of LCD, it is characterized in that, formed by the multiple source driver, each source electrode driver is exported a drive signal after receiving a digital image signal, and the gate drive signal of each sweep trace has one first triggered time and one second triggered time in each picture scan period, described source electrode driver comprises: a data buffer receives described digital image signal; One digital analog converter receives the output data of described data buffer, and according to one group with reference to analog voltage signal, the data that received are converted to an analog image signal; One amplifier receives the output analog image signal of described digital analog converter, and described analog image signal is amplified the back export an amplifying signal; One first switch receives described amplifying signal, and in described first triggered time described amplifying signal is output as described drive signal; One black plug unit receives one first black plug voltage and one second black plug voltage, and in described second triggered time first black plug voltage or the second black plug voltage is output as described first drive signal; And one gamma adjust circuit, this gamma is adjusted circuit and is used for producing described first black plug voltage and the described second black plug voltage in the described black plug unit, and described with reference to analog voltage signal.
The present invention also provides: a kind of source electrode drive circuit of LCD, formed by the multiple source driver, each source electrode driver is exported a drive signal after receiving a digital image signal, and the gate drive signal of each sweep trace has one first triggered time and one second triggered time in each picture scan period, described source electrode driver comprises: a data buffer receives described digital image signal; One digital analog converter receives the output data of described data buffer, and according to one group with reference to analog voltage signal, the data that received are converted to an analog image signal; One amplifier, receive the output analog image signal of described digital analog converter, and described analog image signal is amplified the back export an amplifying signal, and this amplifier also receives a control that enables control signal, and in described first triggered time this amplifying signal is output as described drive signal; One black plug unit receives one first black plug voltage and one second black plug voltage, and in described second triggered time first black plug voltage or the second black plug voltage is output as described first drive signal; And one gamma adjust circuit, this gamma is adjusted circuit and is used for producing described first black plug voltage and the described second black plug voltage in the described black plug unit, and described with reference to analog voltage signal; The wherein said control signal that enables was enabled in described first triggered time, described amplifier is exported amplifying signal, and when described activation control signal was under an embargo, the output terminal of described amplifier was a high impedance status.
Beneficial effect of the present invention is, is prerequisite to implement black insertion technology, and directly adjusting circuit by gamma provides demonstration the complete black required relative voltage of pixel, no longer produces by amplifier.The present invention not only makes the actuating speed of source electrode drive circuit accelerate, and has more reduced the power attenuation of amplifier.Owing to shortened the time span in second triggered time, made the time utilization meeting in first triggered time more flexible.
Description of drawings
Figure 1A is the framework calcspar of an available liquid crystal display;
Figure 1B is the framework calcspar of an existing source electrode drive circuit;
Fig. 2 A is in an available liquid crystal display, and each sweep signal is fed into the sequential chart of each sweep trace in regular turn;
Fig. 2 B is in another available liquid crystal display, and each sweep signal is fed into the sequential chart of each sweep trace in regular turn;
Fig. 2 C is again that each scanning-line signal is fed into the sequential chart of each sweep trace in regular turn in the available liquid crystal display;
Fig. 3 is the framework calcspar of the source electrode drive circuit of LCD of the present invention;
Fig. 4 A is according to the first embodiment of the present invention, the framework calcspar of source electrode driver;
Fig. 4 B is according to the first embodiment of the present invention, and each sweep signal is fed into a sequential chart of each sweep trace in regular turn;
Fig. 4 C is according to the first embodiment of the present invention, and each sweep signal is fed into another sequential chart of each sweep trace in regular turn;
Another framework calcspar of Fig. 5 black plug unit;
One process flow diagram of Fig. 6 source driving method of the present invention;
Fig. 7 according to a second embodiment of the present invention, the framework calcspar of source electrode drive circuit;
Fig. 8 is according to third embodiment of the invention, the framework calcspar of source electrode driver;
Fig. 9 is according to fourth embodiment of the invention, the framework calcspar of source electrode driver.
Embodiment
In conjunction with the accompanying drawings, the implementation process and the advantage of the detailed description by embodiment:
Fig. 3 is the framework calcspar of the source electrode drive circuit of LCD of the present invention.The source electrode drive circuit 300 of LCD of the present invention, be made up of many groups source electrode driver 310, each group source electrode driver 310 comprises two data impact dampers 161,161 ', two-digit analog converter 311,311 ', two amplifier 312,312 ', one switch module 166, one first black plug unit 313 and one second black plug unit 313 '.
Data buffer 161,161 ' receives digital image signal D respectively in each group source electrode driver 310
N-1, D
n(n is the positive integer greater than 1), each digital analog converter 311,311 ' then receives one group of analog voltage signal V
Ref1Or V
Ref2And the digital image signal D of data buffer 161,161 ' output
N-1, Dn, and according to the digital image signal D that receives
N-1From this group analog voltage signal V
Ref1Or V
Ref2The middle selection exported behind the corresponding analog voltage signal.Two amplifiers 312,312 ' receive digital analog converter 311,311 ') output signal, and export one first amplifying signal and one second amplifying signal in regular turn.Switch module 166 is arranged at two amplifiers 312,312 ' and two driver output end S
n, S
N-1Between, first amplifying signal of amplifier 312,312 ' output and second amplifying signal can export driver output end S to by the control of switch module 166 when normal mode (normal and black plug pattern will describe in detail again) in 4B, Fig. 4 C
n, S
N-1, produce first drive signal and second drive signal.The first black plug unit 313 receives one first black plug voltage and one second black plug voltage, and when the black plug pattern, the first black plug voltage or the second black plug voltage is output as first drive signal.The second black plug unit 313 ' receives the first black plug voltage and the second black plug voltage, and when the black plug pattern, the first black plug voltage or the second black plug voltage is output as second drive signal.
Fig. 4 A is according to the first embodiment of the present invention, the framework calcspar of source electrode driver.Fig. 4 B is according in the first embodiment of the present invention, and each sweep signal is fed into the sequential chart of each sweep trace in regular turn.Fig. 4 C is according in the first embodiment of the present invention, and each sweep signal is fed into another sequential chart of each sweep trace in regular turn.
Below be example with the sequential chart of implementing each sweep trace among 4B, Fig. 4 C, describe operation principles of the present invention and framework in detail.In addition, because source electrode drive circuit of the present invention is made up of many groups of identical source electrode drivers, therefore wherein one group of source electrode driver only is described.
According to the present invention, with reference to figure 2A, Fig. 4 B, in the process of an image frame of scanning, the pulse width T of the sweep signal of original gate driver circuit 130 each sweep trace of feed-in
GBe cut into one first triggered time T
1With one second triggered time T
2According to this, data output is divided into two patterns, and data are at the first triggered time T
1What export is normal mode, and at the second triggered time T
2What export is the black plug pattern.
With reference to figure 4A, in the first embodiment of the present invention, each group source electrode driver 410 is provided with two data impact dampers 161,161 ', on the occasion of digital analog converter 162, a negative value digital analog converter 163, switch module 166, one first black plug unit 413 and one second the black plug unit 414 that constitutes on the occasion of amplifier 164, a negative value amplifier 165, by four switch SW 1～SW4.On the occasion of the digital image signal D of digital analog converter 162 according to reception
N-1, from one group of positive analog voltage signal V
Ref1In select corresponding one to be output as and just to simulate signal of video signal.Output one first amplifying signal after 164 in amplifier receives and amplifies this just to simulate signal of video signal.Negative value digital analog converter 163 is according to the digital image signal D that receives
n, from one group of negative analog voltage signal V
Ref2In select corresponding one to be output as the negative analog signal of video signal, 164 in negative value amplifier receives and amplifies output one second amplifying signal behind this negative analog signal of video signal.
Four switch SW 1～SW4 constitute switch module 166, and are controlled by switch controlling signal CS_SW respectively.Two ends of first switch SW 1 are connected to respectively on the occasion of amplifier 164 and driver output end S
N-1, receive first amplifying signal, and controlled by one first switch controlling signal.Two ends of second switch SW2 are connected to negative value amplifier 165 and driver output end S respectively
N-1, receive second amplifying signal, and controlled by the second switch control signal.Two ends of the 3rd switch SW 3 are connected to respectively on the occasion of amplifier 164 and driver output end S
n, receive first amplifying signal, and controlled by the 3rd switch controlling signal.Two ends of the 4th switch SW 4 are connected to negative value amplifier 165 and driver output end S respectively
n, receive second amplifying signal, and controlled by one the 4th switch controlling signal.
Black plug unit 413,414 receives one first black plug voltage V simultaneously
GP1With one second black plug voltage V
GN1 Black plug unit 413 comprises two switch SW 5, SW6, and switch SW 5, SW6 receive the first black plug voltage V respectively
GP1With the second black plug voltage V
GN1, and controlled by the 5th switch controlling signal and the 6th switch controlling signal respectively, when the black plug pattern, incite somebody to action a wherein switch conduction, make the first black plug voltage V
GP1Or the second black plug voltage V
GN1Export driver output end S to
N-1, produce first drive signal.Black plug unit 414 comprises two switch SW 7, SW8, and switch SW 7, SW8 receive the first black plug voltage V respectively
GP1With the second black plug voltage V
GN1, and controlled by minion pass control signal and octavo pass control signal respectively, when the black plug pattern, incite somebody to action a wherein switch conduction, make the first black plug voltage V
GP1Or the second black plug voltage V
GN1Export driver output end S to
n, produce second drive signal.
Undermined for preventing liquid crystal material, the polarity of the data-signal that is added in liquid crystal layer 112c of must periodically reversing, therefore, every a Preset Time, source electrode driver 410 must alternately carry out reversal of poles with the data-signal that exports data line 121 to.According to this, four switch SW 1～SW4 can optionally open circuit (OFF) or conducting (ON).Shown in Fig. 4 B, at first triggered time (normal mode) T
1In, if the polarity of signal of video signal is timing, switch SW 1, SW4 are conducting state, and other switch then is an off state, and positive and negative analog image signal is respectively by driver output end S
N-1, S
nOutput.Otherwise if the polarity of signal of video signal is when negative, switch SW 2, SW3 are conducting state, and other switch then is an off state, and positive and negative analog image signal is respectively by driver output end S
n, S
N-1Output.
At second triggered time (black plug pattern) T
2In, if the polarity of black plug voltage is timing, switch SW 5, SW8 are conducting state, other switch then is an off state, the first black plug voltage V
GP1With the second black plug voltage V
GN1Respectively by driver output end S
n, S
N-1Output.Otherwise if the polarity of black plug voltage is when negative, switch SW 6, SW7 are conducting state, and other switch then is an off state, the first black plug voltage V
GP1With the second black plug voltage V
GN1Respectively by driver output end S
N-1, S
nOutput.
Positive analog voltage signal V
Ref1With negative analog voltage signal V
Ref2All be one group of bus (bus) signal, and and the first black plug voltage V
GP1, the second black plug voltage V
GN1The same, adjusting circuit 150 by gamma provides, and voltage swing can directly be set or be adjusted by control chip, to be applicable to various LCD panels.It should be noted that black plug behind the image data displaying is in order to emphasize contrast (contrast), other color also has same effect, just effect have poor.If will use other color to contrast, the first black plug voltage V
GP1With the second black plug voltage V
GN1Size just must do corresponding adjustment.
Because the present invention directly adjusts circuit by gamma to provide demonstration the complete black required relative voltage of pixel, no longer produces by amplifier, has therefore shortened the second triggered time T
2Time span, make the time T in first triggered time
1Use more flexiblely, and then the timing Design of driving circuit can more be changed.For example the sequential chart among Fig. 4 C in the process of an image frame of scanning, has the second triggered time T of four sweep traces
2Identical.The scan mode of gate driver circuit 130 is in Fig. 4 C, and per four normal modes just add a black plug pattern, simultaneously, the second triggered time T of four sweep traces is arranged simultaneously when the black plug pattern
2Be ON.Therefore, the first triggered time T of the present invention
1Greater than T sweep time among 2B, Fig. 2 C
G/ 2.Therefore, compared with prior art, it is long that signal of video signal of the present invention writes time of storage capacitors 112, and the image quality of display panels is preferable.
Another framework calcspar of Fig. 5 black plug unit.With reference to figure 5, black plug unit 513,514 receives one first black plug voltage V simultaneously
GP1With one second black plug voltage V
GN1 Black plug unit 513 comprises three switch SW 5, SW6, SW9, is electrically connected to driver output end S
N-1Switch SW 5, SW6, SW9 are controlled by the 5th switch controlling signal, the 6th switch controlling signal and the 9th switch controlling signal respectively.A switch conduction can only be arranged in the same time among switch SW 5, the SW6.Black plug unit 514 comprises three switch SW 7, SW8, SW10, is electrically connected to driver output end S
nThree switch SW 7, SW8, SW10 close control signal, octavo pass control signal and the tenth switch controlling signal by minion respectively and are controlled.A switch conduction can only be arranged in the same time among switch SW 7, the SW8.Wherein, above-mentioned the 5th switch controlling signal, the 6th switch controlling signal, minion pass control signal and octavo pass control signal, the 9th switch controlling signal and the tenth switch controlling signal are also controlled by switch controlling signal CS_SW respectively.Switch SW 5～SW10 all can utilize p NMOS N-channel MOS N (PMOS) transistor or n NMOS N-channel MOS N (NMOS) transistor or transmission grid (transmission gate) to implement.
In the prior art, no matter signal of video signal or black plug voltage all must pass through amplifier 164,165, cause the serious power attenuation of amplifier.The demand that must cooperate the speed of gate driver circuit 130 to double for the data-driven speed of source electrode drive circuit 120 is because the time delay of amplifier 164,165 computings own makes the data-driven speed of source electrode drive circuit 120 that its restriction be arranged.Compared with prior art, black plug voltage V of the present invention
GP1, V
GN1Must not pass through amplifier 164,165, by switch SW 5, SW6 can be quicker by driver output end S
N-1, S
nOutput, so, the second triggered time T
2Can be less than the first triggered time T
1At the second triggered time T
2, amplifier 164,165 can temporary close (shutdown) or is prepared to push away next signal of video signal.Therefore, the present invention not only reduces the power consumption of amplifier 164,165, also accelerates the data-driven speed of source electrode drive circuit 120, makes the second triggered time T
2Time shorten, and then increase by the first triggered time T
1, plenty of time writes storage capacitors 112 to make signal of video signal have more, increases the image quality of display panels.
The process flow diagram of Fig. 6 source driving method of the present invention.Below with reference to Fig. 1, Fig. 4 B, Fig. 4 C and Fig. 6 source driving method of the present invention is described.
Source driving method of the present invention is applicable to a display panels 110.On this display panels 110, be provided with many crisscross data lines 121 and multi-strip scanning line 131.As mentioned above, each gate drive signal has one first triggered time T in the scan period of each picture
1With one second triggered time T
2Source driving method of the present invention comprises the following step: in step S602, at the first triggered time T
1In, digital image signal is converted to the analog image signal also exports data line 121 to after the amplification.In step S604, at the second triggered time T
2In, export two different black plug voltages to data line 121 according to polarity, return step 602 to handle follow-up digital image signal.
Wherein, the second triggered time T of each gate drive signal
2All asynchronous (for example shown in Fig. 4 B), or the second triggered time T of N gate drive signal can be arranged
2(shown in Fig. 4 C) synchronously.Among two groups of analog voltage signals, one group is positive analog voltage signal V
Ref1, one group is negative analog voltage signal V
Ref2Similarly, among two black plug voltages, one is positive polarity voltage V
GP1, one is reverse voltage V
GN1The black plug voltage of above-mentioned two groups of analog voltage signals and two opposed polarities is all adjusted circuit 150 by gamma and is provided.
In step S602, according to one group of positive analog voltage signal V
Ref1, with a plurality of digital image signal D
N-1Be converted to a plurality of just simulating signal of video signal and amplifications, simultaneously, according to one group of negative analog voltage signal V
Ref2, with a plurality of digital image signal D
nBe converted to after a plurality of negative analog signal of video signal and the amplification, predetermined according to each liquid crystal layer again polarity is at the first triggered time T
1In export corresponding many data lines 121 simultaneously to.In step S604, according to the predetermined polarity of each liquid crystal layer, at the second triggered time T
2In export two black plug voltages to corresponding many data lines respectively simultaneously.Above running all is with every a Preset Time, must analog image signal and the black plug voltage that export data line to be reversed as the basis.
Fig. 7 according to a second embodiment of the present invention, the framework calcspar of source electrode drive circuit.
With reference to figure 7, the source electrode drive circuit 700 of second embodiment is made up of multiple source driver 710, export a drive signal after each source electrode driver 710 receives a digital image signal, and the gate drive signal of each sweep trace has one first triggered time T in each picture scan period
1With one second triggered time T
2, each source electrode driver 710 all comprises a data buffer 161, a digital analog converter 162, an amplifier 164, a switch SW 1 and a black plug unit 413.
Because the source electrode drive circuit of second embodiment of the invention to the four embodiment all is made up of a plurality of identical source electrode drivers, therefore, below one of them source electrode driver only is described.
Fig. 8 is according to third embodiment of the invention, the framework calcspar of source electrode driver.Fig. 9 is according to fourth embodiment of the invention, the framework calcspar of source electrode driver.
With reference to figure 7, Fig. 8, the circuit of the source electrode driver of the 3rd embodiment and second embodiment is similar, and difference is that the 3rd embodiment does not comprise switch SW 1.The source electrode driver 810 of the 3rd embodiment utilizes one to enable the action that control signal EN_OP comes control amplifier 812, at the first triggered time T
1, amplifier 812 is enabled (enable) exports an amplifying signal afterwards as aforementioned drive signal.And at the second triggered time T
2, enable control signal EN_OP and be under an embargo (disable), make the output terminal of amplifier 812 remain on high impedance status, and export a black plug voltage as aforementioned drive signal by black plug unit 413.
With reference to figure 7, Fig. 9, the circuit of the source electrode driver of second embodiment and the 4th embodiment is also similar, and difference is the circuit of black plug unit.The second embodiment utilization comprises the black plug unit 413 of two switch SW 5, SW6 to be implemented, and implements and the 4th embodiment utilization comprises the black plug unit 513 of three switch SW 5, SW6, SW9.
Framework fundamental purpose of the present invention is to allow the black insertion technology can easier enforcement, and the present invention utilizes simple hardware device, just finishes the purpose of the data-driven speed of accelerating source electrode drive circuit and the power consumption that reduces amplifier.
Though more than with embodiment the present invention is described, therefore do not limit scope of the present invention, only otherwise break away from main idea of the present invention, those skilled in the art can carry out various distortion or change.
Claims (29)
1. the source electrode drive circuit of a LCD, it is characterized in that, formed by many groups source electrode driver, after receiving two digital image signals, each group source electrode driver exports one first drive signal and one second drive signal, and each gate drive signal has one first triggered time and one second triggered time in the scan period of each picture, and this source electrode driver comprises:
Two data impact dampers receive described two-digit signal of video signal respectively;
The two-digit analog converter receives the output data of described two data impact dampers respectively, and respectively according to two groups with reference to analog voltage signal, the data that received are converted to two analog image signals;
Two amplifiers receive the output analog image signal of described digital analog converter respectively, and this analog image signal are amplified the back export one first amplifying signal and one second amplifying signal;
One switch module receives described first and second amplifying signal, and in described first triggered time two amplifying signals is output as described first drive signal and second drive signal;
One first black plug unit receives one first black plug voltage and one second black plug voltage, and in described second triggered time first black plug voltage or the second black plug voltage is output as described first drive signal;
One second black plug unit receives the described first black plug voltage and the second black plug voltage, and in described second triggered time first black plug voltage or the second black plug voltage is output as described second drive signal; And
One gamma is adjusted circuit, and this gamma adjustment circuit is used for producing described first black plug voltage and the described second black plug voltage in the described black plug unit, and described with reference to analog voltage signal.
2. the source electrode drive circuit of LCD as claimed in claim 1 is characterized in that, described switch module comprises:
One first switch receives described first amplifying signal, and is controlled by one first switch controlling signal;
One second switch receives described second amplifying signal, and is controlled by a second switch control signal;
One the 3rd switch receives described first amplifying signal, and is controlled by one the 3rd switch controlling signal; And
One the 4th switch receives described second amplifying signal, and is controlled by one the 4th switch controlling signal;
Wherein, the output terminal of described first switch and second switch is connected to each other, and exports described first drive signal, and the output terminal of described the 3rd switch and the 4th switch is connected to each other, and exports described second drive signal.
3. the source electrode drive circuit of LCD as claimed in claim 2 is characterized in that, the described first black plug unit comprises:
One the 5th switch receives the described first black plug voltage, and is controlled by one the 5th switch controlling signal; And
One the 6th switch receives the described second black plug voltage, and is controlled by one the 6th switch controlling signal;
Wherein, the output terminal of described the 5th switch and the 6th switch is connected to each other, and is connected in the output terminal of described first switch and second switch simultaneously, and described the 5th switch and the 6th switch can only have a switch conduction in the same time.
4. the source electrode drive circuit of LCD as claimed in claim 2 is characterized in that, the described first black plug unit comprises:
One the 5th switch receives the described first black plug voltage, and is controlled by one the 5th switch controlling signal;
One the 6th switch receives the described second black plug voltage, and is controlled by one the 6th switch controlling signal; And
One the 9th switch, by the control of one the 9th switch controlling signal, described the 9th output switching terminal is connected to the output terminal of described first switch and second switch;
Wherein, the output terminal of described the 5th switch and the 6th switch is connected to each other, and is connected to the input end of described the 9th switch simultaneously, and described the 5th switch and the 6th switch can only have a switch conduction in the same time.
5. the source electrode drive circuit of LCD as claimed in claim 3 is characterized in that, the described second black plug unit comprises:
One minion is closed, and receives the described first black plug voltage, and closes control signal control by a minion; And
One octavo is closed, and receives the described second black plug voltage, and closes control signal control by an octavo;
Wherein, this minion is closed the output terminal that closes with octavo and is connected to each other, and is connected in the output terminal of described the 3rd switch and the 4th switch simultaneously, and close with octavo this minion pass can only a switch conduction in the same time.
6. the source electrode drive circuit of LCD as claimed in claim 4 is characterized in that, the described second black plug unit comprises:
One minion is closed, and receives the described first black plug voltage, and closes control signal control by a minion;
One octavo is closed, and receives the described second black plug voltage, and closes control signal control by an octavo; And
The tenth switch, by the control of 1 the tenth switch controlling signal, its output terminal is connected to the output terminal of described the 3rd switch and the 4th switch;
Wherein, this minion is closed the output terminal that closes with octavo and is connected to each other, and is connected to the input end of the tenth switch simultaneously, and close with octavo this minion pass can only a switch conduction in the same time.
7. the source electrode drive circuit of LCD as claimed in claim 1 is characterized in that, among described first black plug voltage and the described second black plug voltage, one is positive polarity voltage, and another is a reverse voltage.
8. the source electrode drive circuit of LCD as claimed in claim 1 is characterized in that, among described two groups of analog voltage signals, one group of analog voltage signal is a positive polarity voltage, and another group analog voltage signal is a reverse voltage.
9. the source electrode drive circuit of LCD as claimed in claim 1 is characterized in that, the described first triggered time length is greater than the described second triggered time length.
10. the source electrode drive circuit of LCD as claimed in claim 1 is characterized in that, the described first triggered time length equals the described second triggered time length.
11. the source driving method of a display panels, it is characterized in that, be provided with crisscross many data lines and multi-strip scanning line on the display panels, every sweep trace has one first triggered time and one second triggered time in the scan period of each picture, and this source driving method comprises the following step:
Actuation step in described first triggered time, is converted to the analog image signal with a plurality of digital image signals and also exports described many data lines to after the amplification; And
The black plug step in described second triggered time, directly exports two different black plug voltages to described many data lines according to polarity;
Wherein said black plug voltage is adjusted circuit by a gamma of display panels and is provided.
12. source driving method as claimed in claim 11 is characterized in that, second triggered time of every sweep trace is all inequality in the described multi-strip scanning line.
13. source driving method as claimed in claim 12 is characterized in that, the described first triggered time length is greater than the described second triggered time length.
14. source driving method as claimed in claim 11 is characterized in that, second triggered time of every N bar sweep trace is identical in the described multi-strip scanning line.
15. source driving method as claimed in claim 14 is characterized in that, described N is 4.
16. source driving method as claimed in claim 11 is characterized in that, among described two black plug voltages, one is positive polarity voltage, and one is reverse voltage.
17. source driving method as claimed in claim 16, it is characterized in that, in described black plug step, also, in described second triggered time, simultaneously two black plug voltages are exported to corresponding described many data lines respectively according to the predetermined polarity of each liquid crystal layer.
18. the source electrode drive circuit of a LCD, it is characterized in that, formed by the multiple source driver, each source electrode driver is exported a drive signal after receiving a digital image signal, and the gate drive signal of each sweep trace has one first triggered time and one second triggered time in each picture scan period, and described source electrode driver comprises:
One data buffer receives described digital image signal;
One digital analog converter receives the output data of described data buffer, and according to one group with reference to analog voltage signal, the data that received are converted to an analog image signal;
One amplifier receives the output analog image signal of described digital analog converter, and described analog image signal is amplified the back export an amplifying signal;
One first switch receives described amplifying signal, and in described first triggered time described amplifying signal is output as described drive signal;
One black plug unit receives one first black plug voltage and one second black plug voltage, and in described second triggered time first black plug voltage or the second black plug voltage is output as described first drive signal; And
One gamma is adjusted circuit, and this gamma adjustment circuit is used for producing described first black plug voltage and the described second black plug voltage in the described black plug unit, and described with reference to analog voltage signal.
19. the source electrode drive circuit of LCD as claimed in claim 18 is characterized in that, described black plug unit comprises:
One the 5th switch receives the described first black plug voltage, and is controlled by one the 5th switch controlling signal; And
One the 6th switch receives the described second black plug voltage, and is controlled by one the 6th switch controlling signal;
Wherein, the output terminal of the 5th switch and the 6th switch is connected to each other, and is connected in the output terminal of described first switch simultaneously, and the 5th switch and the 6th switch can only have a switch conduction in the same time.
20. the source electrode drive circuit of LCD as claimed in claim 18 is characterized in that, described black plug unit comprises:
One the 5th switch receives the described first black plug voltage, and is controlled by one the 5th switch controlling signal;
One the 6th switch receives the described second black plug voltage, and is controlled by one the 6th switch controlling signal; And
One the 9th switch, by the control of one the 9th switch controlling signal, the 9th output switching terminal is connected to the output terminal of described first switch;
Wherein, the output terminal of the 5th switch and the 6th switch is connected to each other, and is connected to the input end of the 9th switch simultaneously, and the 5th switch and the 6th switch can only have a switch conduction in the same time.
21. the source electrode drive circuit of LCD as claimed in claim 18 is characterized in that, among described first black plug voltage and the described second black plug voltage, one is positive polarity voltage, and another is a reverse voltage.
22. the source electrode drive circuit of LCD as claimed in claim 18 is characterized in that, the described first triggered time length is greater than the described second triggered time length.
23. the source electrode drive circuit of LCD as claimed in claim 18 is characterized in that, the described first triggered time length equals the described second triggered time length.
24. the source electrode drive circuit of a LCD, formed by the multiple source driver, each source electrode driver is exported a drive signal after receiving a digital image signal, and the gate drive signal of each sweep trace has one first triggered time and one second triggered time in each picture scan period, and described source electrode driver comprises:
One data buffer receives described digital image signal;
One digital analog converter receives the output data of described data buffer, and according to one group with reference to analog voltage signal, the data that received are converted to an analog image signal;
One amplifier, receive the output analog image signal of described digital analog converter, and described analog image signal is amplified the back export an amplifying signal, and this amplifier also receives a control that enables control signal, and in described first triggered time this amplifying signal is output as described drive signal;
One black plug unit receives one first black plug voltage and one second black plug voltage, and in described second triggered time first black plug voltage or the second black plug voltage is output as described first drive signal; And
One gamma is adjusted circuit, and this gamma adjustment circuit is used for producing described first black plug voltage and the described second black plug voltage in the described black plug unit, and described with reference to analog voltage signal;
The wherein said control signal that enables was enabled in described first triggered time, described amplifier is exported amplifying signal, and when described activation control signal was under an embargo, the output terminal of described amplifier was a high impedance status.
25. the source electrode drive circuit of LCD as claimed in claim 24 is characterized in that, described black plug unit comprises:
One the 5th switch receives the described first black plug voltage, and is controlled by one the 5th switch controlling signal; And
One the 6th switch receives the described second black plug voltage, and is controlled by one the 6th switch controlling signal;
Wherein, the output terminal of the 5th switch and the 6th switch is connected to each other, and is connected in the output terminal of described amplifier simultaneously, and the 5th switch and the 6th switch can only have a switch conduction in the same time.
26. the source electrode drive circuit of LCD as claimed in claim 24 is characterized in that, described black plug unit comprises:
One the 5th switch receives the described first black plug voltage, and is controlled by one the 5th switch controlling signal;
One the 6th switch receives the described second black plug voltage, and is controlled by one the 6th switch controlling signal; And
One the 9th switch, by the control of one the 9th switch controlling signal, the 9th output switching terminal is connected to the output terminal of described amplifier;
Wherein, the output terminal of described the 5th switch and the 6th switch is connected to each other, and is connected to the input end of described the 9th switch simultaneously, and described the 5th switch and the 6th switch can only have a switch conduction in the same time.
27. the source electrode drive circuit of LCD as claimed in claim 24 is characterized in that, among described first black plug voltage and the described second black plug voltage, one is positive polarity voltage, and another is a reverse voltage.
28. the source electrode drive circuit of LCD as claimed in claim 24 is characterized in that, the described first triggered time length is greater than the described second triggered time length.
29. the source electrode drive circuit of LCD as claimed in claim 24 is characterized in that, the described first triggered time length equals the described second triggered time length.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100930660A CN100428325C (en) | 2005-08-25 | 2005-08-25 | Source circuit and method for driving liquid crystal display device |
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| CNB2005100930660A CN100428325C (en) | 2005-08-25 | 2005-08-25 | Source circuit and method for driving liquid crystal display device |
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| CN100428325C true CN100428325C (en) | 2008-10-22 |
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| TWI352333B (en) | 2006-05-02 | 2011-11-11 | Chimei Innolux Corp | Gray scale circuit and the method thereof |
| CN101311782B (en) * | 2007-05-25 | 2011-07-20 | 奇美电子股份有限公司 | Gray scale voltage generation circuit and its operation method |
| TWI420481B (en) * | 2009-06-01 | 2013-12-21 | Raydium Semiconductor Corportation | Display device and brightness adjusting method |
| CN101923836B (en) * | 2009-06-10 | 2012-11-14 | 瑞鼎科技股份有限公司 | Display device and brightness control method thereof |
| CN103325346A (en) * | 2012-03-22 | 2013-09-25 | 联咏科技股份有限公司 | Driving control method and correlative source electrode driver |
| CN104978935B (en) * | 2014-04-02 | 2018-03-27 | 奇景光电股份有限公司 | Source electrode driver and the display panel using this source electrode driver |
| CN104505051A (en) * | 2014-12-31 | 2015-04-08 | 深圳市华星光电技术有限公司 | Liquid crystal display and control method thereof |
| CN106128350A (en) * | 2016-08-30 | 2016-11-16 | 武汉华星光电技术有限公司 | The mobile terminal shown based on RGBW and display packing thereof |
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| US6473077B1 (en) * | 1998-10-15 | 2002-10-29 | International Business Machines Corporation | Display apparatus |
| CN1379388A (en) * | 2001-01-22 | 2002-11-13 | 松下电器产业株式会社 | Display equipment and its driving method |
| JP2003233352A (en) * | 2002-02-07 | 2003-08-22 | Matsushita Electric Ind Co Ltd | Liquid crystal display device |
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| US6473077B1 (en) * | 1998-10-15 | 2002-10-29 | International Business Machines Corporation | Display apparatus |
| CN1379388A (en) * | 2001-01-22 | 2002-11-13 | 松下电器产业株式会社 | Display equipment and its driving method |
| JP2003233352A (en) * | 2002-02-07 | 2003-08-22 | Matsushita Electric Ind Co Ltd | Liquid crystal display device |
| JP2003309784A (en) * | 2002-04-17 | 2003-10-31 | Matsushita Electric Ind Co Ltd | Video signal processor |
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