CN100587770C - Scanning circuit, scanning device, image display apparatus and television apparatus - Google Patents
Scanning circuit, scanning device, image display apparatus and television apparatus Download PDFInfo
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- CN100587770C CN100587770C CN200610077090A CN200610077090A CN100587770C CN 100587770 C CN100587770 C CN 100587770C CN 200610077090 A CN200610077090 A CN 200610077090A CN 200610077090 A CN200610077090 A CN 200610077090A CN 100587770 C CN100587770 C CN 100587770C
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Abstract
A scanning circuit having a plurality of output units each outputs an ON potential sequentially, comprises: a first output unit that changes an ON potential to an OFF potential during a first period;and a second output unit that changes the OFF potential to the ON potential during a second period, wherein at least part of the first period and at least part of the second period overlap.
Description
Technical field
The present invention relates to sweep circuit, scanister, image display device and television equipment.
Background technology
A kind ofly carry out with 2 times of speed displacement (shift) clocks that 2 lines drive simultaneously and the method for high speed conversion row selection wire is open in Japanese laid-open patent Shen Qing Publication No.11-24622.In addition, a kind of type of drive of different impedances of using comes the method for stabilized driving waveform open in Japanese laid-open patent Shen Qing Publication No.2004-4429.
In Japanese laid-open patent Shen Qing Publication No.11-24622 disclosed technology be a kind of particular color on screen top draw in the part and the particular color of screen bottom draw use in the part clock signal and output allow signal select simultaneously in the display line 2 lines, divide the abstract image signal and carry out the technology that compression is drawn at the center picture display part, so that prevent the misoperation of vertical driver.
Disclosed technology is a kind of uneven technology of waveform that suppresses drive waveforms rising and decline place by a plurality of drivers with different impedances in Japanese laid-open patent Shen Qing Publication No.2004-4429.
Summary of the invention
The purpose of this invention is to provide a kind of can the inhibition because sweep circuit, scanister, image display device and the television equipment that shortens during the demonstration that existence caused of transition period.
To achieve these goals, according to a first aspect of the invention, provide a kind of sweep circuit, have a plurality of output units that each all exports the conducting current potential in proper order, comprising:
First output unit is changed into stopping potential with the conducting current potential between the first phase; And
Second output unit is changed into the conducting current potential in the second phase with stopping potential;
Wherein, at least a portion is overlapping with at least a portion second phase between the first phase.
Here, preferably be equal to or greater than 100ns between the first phase.In addition, preferably the second phase also is equal to or greater than 100ns.Can be measured as electromotive force changes to the state of stable output stopping potential from the state of output conducting current potential time between the first phase.The second phase can be measured as electromotive force changes to the state of stable output conducting current potential from the state of output stopping potential time.In addition, the best overlay rate be between the first phase or the second phase 50% or more.
According to a second aspect of the invention, provide a kind of sweep circuit, be used to scan the multi-strip scanning wiring, comprising:
First output unit is connected to first scanning lines; And
Second output unit is connected to the scanning lines different with first scanning lines;
Wherein, when being in, carries out when making first scanning lines be the state of signal level output of selection mode described first output unit, described first output unit begins to have the output of first driving force, beginning making signal level to be exported change near the signal level of nonselection mode, and begin to have the output of second driving force bigger after between the first phase than first driving force;
When described second output unit is in the state of the signal level output that execution makes after selection first scanning lines, scanning lines to be selected is nonselection mode, described second output unit begins to have the output of the 3rd driving force, beginning making signal level to be exported change near the signal level of selection mode, and after the second phase, begin to have the output of the 4 wheel driven kinetic force bigger than the 3rd driving force; And
At least a portion is overlapping with at least a portion second phase between the first phase.
Driving force can be expressed as the magnitude of current that can flow through.In addition, also can represent by resistance value.
It is that to make the scanning lines that is connected to second output unit be that the signal level of selection mode is mutually the same for the signal level of selection mode and second output unit that best first output unit makes first scanning lines.
It is that to make the scanning lines that is connected to second output unit be that the signal level of nonselection mode is mutually the same for the signal level of nonselection mode and second output unit that best first output unit makes first scanning lines.
According to a third aspect of the invention we, be preferably in a second aspect of the present invention, by second driving force first scanning lines is remained on the signal level of nonselection mode, and by the 4 wheel driven kinetic force will be after first scanning lines scanning lines to be selected remain on the signal level of selection mode.
According to a forth aspect of the invention, provide a kind of sweep circuit, be used to scan the multi-strip scanning wiring, comprising:
First output unit is connected to first scanning lines; And
Second output unit is connected to the scanning lines different with first scanning lines; Wherein
Described first output unit comprises:
First driving transistors, be at described first output unit and carry out when making first scanning lines be the state of signal level output of selection mode, switch to conducting state from cut-off state, to begin to make signal level to be exported change near the signal level of nonselection mode; And
Second driving transistors, when cut-off state switches to conducting state, remain on cut-off state at described first driving transistors, after between the first phase that when cut-off state switches to conducting state, begins from described first driving transistors, switch to conducting state from cut-off state;
Described second output unit comprises:
The 3rd driving transistors, when described second output unit is in the state of the signal level output that execution makes after selection first scanning lines, scanning lines to be selected is nonselection mode, switch to conducting state from cut-off state, to begin to make signal level to be exported change near the signal level of selection mode; And
4 wheel driven moves transistor, when cut-off state switches to conducting state, remain on cut-off state at described the 3rd driving transistors, after the second phase that when cut-off state switches to conducting state, begins from described the 3rd driving transistors, switch to conducting state from cut-off state;
Wherein, described second driving transistors has than the big driving force of described first driving transistors; And
At least a portion is overlapping with at least a portion second phase between the first phase.
According to a fifth aspect of the invention, provide a kind of sweep circuit, be used to scan the multi-strip scanning wiring, comprising:
First output unit is connected to first scanning lines; And
Second output unit is connected to the scanning lines different with first scanning lines; Wherein
Described first output unit comprises:
First driving transistors, be at described first output unit and carry out when making first scanning lines be the state of signal level output of selection mode, switch to conducting state from cut-off state, to begin to make signal level to be exported change near the signal level of nonselection mode; And
Second driving transistors, when cut-off state switches to conducting state, remain on cut-off state at described first driving transistors, after between the first phase that when cut-off state switches to conducting state, begins from described first driving transistors, switch to conducting state from cut-off state;
Described second output unit comprises:
The 3rd driving transistors, when described second output unit is in the state of the signal level output that execution makes after selection first scanning lines, scanning lines to be selected is nonselection mode, switch to conducting state from cut-off state, to begin to make signal level to be exported change near the signal level of selection mode; And
4 wheel driven moves transistor, when cut-off state switches to conducting state, remain on cut-off state at described the 3rd driving transistors, after the second phase that when cut-off state switches to conducting state, begins from described the 3rd driving transistors, switch to conducting state from cut-off state;
Wherein, the moving transistor of described 4 wheel driven has than the big driving force of described the 3rd driving transistors; And
At least a portion is overlapping with at least a portion second phase between the first phase.
According to a sixth aspect of the invention, provide a kind of sweep circuit, be used to scan the multi-strip scanning wiring, comprising:
First output unit is connected to first scanning lines; And
Second output unit is connected to the scanning lines different with first scanning lines; Wherein
Described first output unit comprises:
First driving transistors, be at described first output unit and carry out when making first scanning lines be the state of signal level output of selection mode, switch to conducting state from cut-off state, to begin to make signal level to be exported change near the signal level of nonselection mode; And
Second driving transistors, when cut-off state switches to conducting state, remain on cut-off state at described first driving transistors, after between the first phase that when cut-off state switches to conducting state, begins from described first driving transistors, switch to conducting state from cut-off state;
Described second output unit comprises:
The 3rd driving transistors, when described second output unit is in the state of the signal level output that execution makes after selection first scanning lines, scanning lines to be selected is nonselection mode, switch to conducting state from cut-off state, to begin to make signal level to be exported change near the signal level of selection mode; And
4 wheel driven moves transistor, when cut-off state switches to conducting state, remain on cut-off state at described the 3rd driving transistors, after the second phase that when cut-off state switches to conducting state, begins from described the 3rd driving transistors, switch to conducting state from cut-off state;
Wherein, described second driving transistors switches to conducting state from cut-off state during the conducting state that keeps described first driving transistors; And
At least a portion is overlapping with at least a portion second phase between the first phase.
According to a seventh aspect of the invention, provide a kind of sweep circuit, be used to scan the multi-strip scanning wiring, comprising:
First output unit is connected to first scanning lines; And
Second output unit is connected to the scanning lines different with first scanning lines; Wherein
Described first output unit comprises:
First driving transistors, be at described first output unit and carry out when making first scanning lines be the state of signal level output of selection mode, switch to conducting state from cut-off state, to begin to make signal level to be exported change near the signal level of nonselection mode; And
Second driving transistors, when cut-off state switches to conducting state, remain on cut-off state at described first driving transistors, after between the first phase that when cut-off state switches to conducting state, begins from described first driving transistors, switch to conducting state from cut-off state;
Described second output unit comprises:
The 3rd driving transistors, when described second output unit is in the state of the signal level output that execution makes after selection first scanning lines, scanning lines to be selected is nonselection mode, switch to conducting state from cut-off state, to begin to make signal level to be exported change near the signal level of selection mode; And
4 wheel driven moves transistor, when cut-off state switches to conducting state, remain on cut-off state at described the 3rd driving transistors, after the second phase that when cut-off state switches to conducting state, begins from described the 3rd driving transistors, switch to conducting state from cut-off state;
Wherein, the moving transistor of described 4 wheel driven switches to conducting state from cut-off state during the conducting state that keeps described the 3rd driving transistors; And
At least a portion is overlapping with at least a portion second phase between the first phase.
According to an eighth aspect of the invention, provide a kind of scanister, be used to scan the multi-strip scanning wiring, comprising:
Described sweep circuit according to either side in first aspect present invention to the seven aspects;
Control circuit is used at described sweep circuit, and the beginning of definition between the first phase and first control signal and the beginning of the definition second phase and second control signal of end of end are provided;
First transmission line is used for first control signal is transferred to described sweep circuit from described control circuit; And
Second transmission line is used for second control signal is transferred to described sweep circuit from described control circuit.
According to a ninth aspect of the invention, in according to an eighth aspect of the invention, one in first control signal and second control signal also is used as clock signal, is used to define the timing that is used to switch scanning lines to be selected.
According to the tenth aspect of the invention, provide a kind of scanister, be used to scan the multi-strip scanning wiring, comprising:
Described sweep circuit according to either side in first aspect present invention to the seven aspects;
Control circuit is used at described sweep circuit, and beginning and end and the beginning of the definition second phase and the control signal of end between the definition first phase are provided; And
Transmission line is used for control signal is transferred to described sweep circuit from described control circuit.
According to an eleventh aspect of the invention, in according to the tenth aspect of the invention, control signal also as clock signal, is used to define the timing that is used to switch scanning lines to be selected.
In described each invention, preferably adopt the configuration of arranging the output unit that satisfies above-mentioned requirements corresponding to all scanning lines in the above.
According to a twelfth aspect of the invention, provide a kind of image display device, comprising:
Described sweep circuit according to either side in eighth aspect present invention to the ten one side;
The multi-strip scanning wiring;
Many modulation wirings are provided with modulation signal;
A plurality of matrix of display elements are connected with described modulation wiring by described multi-strip scanning wiring; And
Modulation circuit is used for providing modulation signal to the modulation wiring.
According to a thirteenth aspect of the invention, provide a kind of television equipment, comprising:
The image display device of the 12 aspect according to the present invention;
Tuner is used to select television broadcasting signal;
Wherein, carrying out image according to the signal from tuner output shows.
Description of drawings
Fig. 1 is the synoptic diagram of expression according to the image display device of first embodiment of the invention;
Fig. 2 is the circuit diagram of expression according to the scan drive cell of first embodiment of the invention;
Fig. 3 is the drive waveforms figure of expression according to the scan drive cell of first embodiment of the invention;
Fig. 4 is that expression uses output to allow the drive waveforms figure of the scan drive cell of signal;
Fig. 5 be expression according to first embodiment of the invention in rise time and fall time the drive waveforms figure of scan drive cell when inequality;
Fig. 6 is the circuit diagram of expression according to the output buffer circuit of first embodiment of the invention;
Fig. 7 is the circuit diagram that expression is used to generate the signal that drives output buffer;
Fig. 8 is the signal waveforms that expression is used to drive output buffer;
Fig. 9 be expression according to second embodiment of the invention in the rise time drive waveforms figure of scan drive cell when identical with fall time;
Figure 10 is the drive waveforms figure of expression according to third embodiment of the invention; And
Figure 11 is that the expression employing is according to the set-top box of the matrix driving device of the embodiment of the invention and the block scheme of television equipment.
Embodiment
Embodiments of the invention are described below with reference to accompanying drawings.In whole accompanying drawings of all embodiment, identical reference number is represented identical or corresponding parts.
Image display device according to first embodiment of the invention at first is described.Fig. 1 illustrates the overall arrangement that adopts the image display device of surface conductive radiated element according to first embodiment.
As shown in Figure 1, according to the image display device of first embodiment comprise matrix panel 1, scanning lines 2, modulation wiring 3, as the control module 4 of control circuit, as comprising such as the scan drive cell 5 of the sweep circuit of the scan drive circuit of turntable driving IC and as the modulation driver element 6 that comprises such as the modulation circuit of the modulation drive circuit of modulation drive IC.
In first embodiment, can show various pictures by the voltage that uses control module 4 controls to be applied to scanning lines 2 and modulation wiring 3.In addition, as mentioned above, the brightness that the light emission by fluorescent material 3c is obtained is along with the increase of electronic collision time increases.Therefore, must guarantee during the electronics emission of surface conductive radiated element 3a that promptly, the application time of voltage on surface conductive radiated element 3a is so that increase brightness.
(driver element)
In first embodiment, use 4 integrated circuit to dispose scan drive cell 5 so that address this problem.Scan drive cell 5 by disposing in the manner described above is applied to scanning lines 2 and display image on matrix panel 1 with predetermined voltage.
(scan drive cell)
The basic driver operation of the scanning lines of being undertaken by scan drive cell 5 will be described now.Fig. 2 illustrates the part scan drive cell 5 of first embodiment, and Fig. 3 illustrates an example of the drive waveforms of scan drive cell 5.
As shown in Figure 2, comprise the shift register 9 of the drive wire of determining scanning lines 2 and convert the output of shift register 9 to driven sweep the connect up output buffer 8 of 2 required voltage levels according to the scan drive cell 5 of first embodiment.
When shifted data (n line shifted data) was input to the output buffer 8 that is connected from top n bar scanning lines, output buffer 8 outputs selected signals to the scanning lines 2 that is connected.The waveform of selecting signal is a n line drive waveforms (A) as shown in Figure 3.When shifted data (n+1 line shifted data) when being input to the output buffer 8 that is connected with (n+1) bar scanning lines, relevant output buffer output selects signal to the scanning lines 2 that is connected.The waveform of selecting signal in this case is (n+1) line drive waveforms (A) as shown in Figure 3.When shifted data (n+2 line shifted data) when being input to the output buffer 8 that is connected with (n+2) bar scanning lines, relevant output buffer 8 outputs select signals to the scanning lines 2 that is connected.The waveform of selecting signal in this case is (n+2) line drive waveforms (A) as shown in Figure 3.Shift register 9 is subsequently similarly exported, and order driven sweep wiring 2.
When carrying out above-mentioned driving,, so dash and upper punch under the drive waveforms because scanning lines comprises inductive component.Each drive waveforms is connected to scanning lines adjacent one another are 2.Therefore, the phenomenon that adjacent scanning lines 2 influences each other takes place, this is caused by mutual inductance between them and electrostatic capacitance.
An aspect that tackles this situation is that the output of importing as shown in Figure 4 allows 7 to scan drive cell 5.Carry out logical multiply between allowing of shifted data and output (" with " control), and only select output allow for high during.Therefore, can adopt the driving method that upper punch and Xia Chong are kept off.But, owing in this driving method, shorten during the selection of each bar scanning lines 2, thereby cause brightness to reduce.
In first embodiment, adopt following structure to solve this problem.Specifically, the upper punch of drive waveforms and following revolution rate (slew rate) of dashing by the controlling and driving waveform suppress.Especially, preferably spend the transition (carry out the transition to stopping potential or carry out the transition to the conducting current potential) that 100ns or longer time are used for current potential from stopping potential from the conducting current potential.Use the timing signal of hereinafter describing to be set to expectation value by this transition period.When the revolution rate of controlling and driving waveform, the required time of transition increases.At present embodiment, in n line drive waveforms D (26) from choosing non-selected transition and overlapping from the non-transition of choosing selection among (n+1) line drive waveforms D (27), as shown in Figure 5.Can control effective time (earned hours) (can be used for applying the time of modulation signal).Especially, the transition from selection mode to non-selected state and never selection mode is best in the overlapping fully formation of same timing to the transition of selection mode.In addition, in order to control the shortening of effective time, preferably each all is no more than 2 microseconds with the second phase between the first phase.
Exist upper punch and down towards the time needs as shown in Figure 4 stable stand-by period of waveform for example.But, in first embodiment, not needing stable stand-by period of waveform, this is because revolution rate that can the controlling and driving waveform.
In addition, in n line drive waveforms (D) from choosing non-selected transition and overlapping from the non-transition of choosing selection (n+1) line drive waveforms (D).Shortening during the selection is inhibited thus.Although will be described in more detail below, comprise as shown in Figure 5 rising control signal 24 and decline control signal 25 in order to the signal of controlling and driving waveform from control module 4 output.In order to reduce the control signal quantity of drive waveforms, shift clock signal shown in Figure 5 also can be used as rising control signal 24.
In first embodiment, shift clock signal 10 is by first transmission line, and decline control signal 25 is by second transmission line.By using the shortening during first transmission line and second transmission line can suppress the selection of scanning lines 2, and can suppress the reduction of brightness.This will specifically set forth below.
(modulation signal)
Now modulation signal will be described.Generally, in the image display device that adopts surface conductive radiated element 3a, along with the pulse width in the width modulation (PWM) broadens, it is big that the integrated value of briliancy becomes.Therefore, along with the pulse width in the width modulation (PWM) broadens, display brightness brightens.In driving method as shown in Figure 4, the signal that following for fear of by fall time the time dashes and the influences such as upper punch the during rise time cause is scurried the negative effect of into adjacent scanning lines 2, waiting for a period of time until dashing down or the upper punch problem solves (calming down the stand-by period) and just carries out next driving afterwards, dash or upper punch etc. the generation of promptly so-called link (linking) down so that solve.Therefore, the maximum pulse of PWM becomes in the driving method of Fig. 4
The maximum pulse of PWM=one sweep time-(fall time+fall down dash calm down stand-by period+rise time+the rising upper punch calms down the stand-by period).
In first embodiment, when carrying out the control of revolution rate, use two control signals, so that the rising of drive signal and descend overlapping.Therefore, the maximum pulse of PWM becomes
The maximum pulse of PWM=one sweep time-(fall time or the rise time).
That is to say that the maximum pulse of PWM can be come broadening by (fall down dash calm down stand-by period+rise time (or fall time)+rising upper punch calm down the stand-by period).
Thus, modulation signal become have from each bar line decline transition period finish be timed between the timing that each bar line rising transition period begins during as the pwm signal of maximum pwm pulse width.
(the rise control and the control that descends)
Now with rising control and the decline of description control according to first embodiment.Fig. 5 illustrates the sequential chart of the rise control and the control that descends, and Fig. 6 illustrates the circuit diagram according to the output buffer 8 of first embodiment.
As shown in Figure 6, the output buffer 8 according to first embodiment is configured to the strong driven MOS transistor 31 of rising and the weak driven MOS transistor 32 that rises that drive (driving with weak current) MOS transistor 29 a little less than the decline of p channel MOS transistor formation and descend and drive (with strong current drive) MOS transistor 30 by force and constitute with the n channel MOS transistor.
To specify the circuit operation of output buffer 8 now.In first embodiment,, therefore when selecting signal to rise, current potential is reduced, and when selecting signal to descend, current potential is risen because the current potential of scanning lines is a low level when selection mode.
In Fig. 6, selecting current potential is the current potential that is supplied to power lead 38, is the current potential that is supplied to power lead 37 but not select current potential.In fact, because the conducting resistance of driving transistors and the resistance in the conductive path, the current potential (being equivalent to " conducting current potential " of the present invention) that is supplied to scanning lines under the selection mode is different with the current potential that is supplied to power lead 38 keeping.
The current potential (being equivalent to " stopping potential " of the present invention) that is supplied to scanning lines under the nonselection mode is different with the current potential that is supplied to power lead 37 keeping.In the following embodiments, will " select current potential 38 " and regard the current potential that will be supplied to power lead 38 as, and " non-selection current potential 37 " regarded as the current potential that will be supplied to power lead 37, so that avoid tediously long explaining.
At first, the drive signal 36 of the weak driven MOS transistor 32 that rises when the rising control signal 24 of Fig. 5 rises becomes height, and weak driven MOS transistor 32 conductings of rising.The weak driven MOS transistor 32 that rises for example has the approximately big conducting resistance of 1k Ω.At this weak driven MOS transistor 32 that rises, be reduced to selection current potential 38 from the current potential of scanning output end 39 slow supply of current and scanning output end 39.The scanning lines that is connected with output buffer shown in Figure 6 is in selection mode thus.
Become the timing of selecting current potential 38 at the current potential of scanning output end 39, when being in the decline state as the rising control signal 24 of first control signal shown in Figure 5, be used to drive the rise transistorized drive signal 35 of the strong driven MOS of rising of strong driven MOS transistor 31 and become height, and strong driven MOS transistor 31 conductings of rising.The strong driven MOS transistor 31 that rises has the driving force than the weak driven MOS transistor Final 32 of rising, and this is because its conducting resistance only is made as several ohm.That is to say that driven MOS transistor 32 was little a little less than conducting resistance rose than use, and can flow through bigger electric current.Converged to the current potential of selecting current potential 38 at this spot scan output terminal 39.Therefore, can prevent under scanning output end 39 occurs, to dash.
During from the front end of a pulse of rising control signal to end corresponding to the first phase.Afterwards, when waveform descends, in first embodiment, till the current potential of selecting current potential rises beginning, obtain the state that scanning lines is driven together by two the parallel weak driven MOS transistors 32 of transistors rising that connect and the strong driven MOS transistor 31 that rises, that is the state of selecting current potential to provide together, by two transistors.That is to say, different in the conducting state of the rising start time of selecting signal and the selection signal driving force of holding time.Strong when specifically, making driving force ratio when keeping conducting state rise beginning.
In first embodiment, obtain suitable revolution rate by using the configuration of satisfying following two conditions:
(1) number of transistors of conducting is more than the number of transistors of conducting when rising beginning when keeping conducting state; And
(2) when rising beginning not conducting and only when keeping conducting state the transistorized driving force of conducting stronger than the transistorized driving force of conducting when rising beginning.
Condition is not limited only to describe in first embodiment so far, and by only satisfying in two conditions one also can suitably be provided with the revolution rate.For example, thus also can adopt use two have the transistor of identical driving force, when selecting signal to rise beginning only transistor of conducting and selecting signal risen to predetermined state after two transistors of conducting keep the configuration of the conducting state of selecting signal.Relevant therewith is, this that is to say when selecting signal to descend, when making the current potential of selecting signal rise to nonselection mode in first embodiment, is identical.
The decline of rising control signal 24 regularly (timing of the strong driven MOS transistor turns that rises) is set to rise to the current potential that scans output and selects the timing of current potential (be reduced to and select current potential) identical, but is not limited only to this.The current potential of the timing ratio scanning output if rise during strong driven MOS transistor turns rises to selects the timing of current potential (be reduced to and select current potential) fast, the driving of big driving force is middle the transition period from non-selection current potential to the selection current potential, and reaches the selection current potential afterwards fast.
A pulse of rising control signal as mentioned above, 24 is used for defining two timings.Specifically, select the rising of signal to begin the front end definition of the timing of (beginning of rising transition period), and driving force big selection when rising beginning drive the end definition of the timing of beginning by this pulse of by a pulse.
When decline control signal shown in Figure 5 25 rose, the drive signal 33 of the weak driven MOS transistor 29 that descends became low, and weak driven MOS transistor 29 conductings that descend.Weak driven MOS transistor 29 for example has the approximately conducting resistance of 1k Ω owing to descend, and electric current slowly is supplied to scanning output end 39 and scanning output end 39 to rise to non-selection current potential 37.
When the timing decline control signal 25 that becomes the current potential of non-selection current potential 37 at scanning output end 39 descended, the drive signal 34 of the strong driven MOS transistor 30 that descends became low, and strong driven MOS transistor 30 conductings that descend.
The conducting resistance of strong driven MOS transistor 30 is set to several ohm owing to descend, can be with bigger current drives.That is to say that the strong driven MOS transistor 30 that descends has the driving force (little conducting resistance) than weak driven MOS transistor the last 29 that descend.Be in non-selection current potential 37 and kept balance at this spot scan output terminal 39.Therefore, can prevent from upper punch to occur at scanning output end 39.
From as the front end of a pulse of the decline control signal 25 of second control signal during the end corresponding to the second phase.In first embodiment decline of decline control signal 25 regularly (timings of strong driven MOS transistor 30 conductings that descend) to be set to drop to the current potential that scans output the timing of non-selection current potential (rising to non-selection current potential) identical, but be not limited only to this.The timing that the current potential that the scanning of the timing ratio of strong driven MOS transistor 30 conductings is exported if descend drops to non-selection current potential (rising to non-selection current potential) is fast, the driving of big driving force is middle the transition period from the selection current potential to non-selection current potential, and reaches non-selection current potential afterwards fast.
A pulse of decline control signal as mentioned above, 25 is used for defining two timings.Specifically, select the decline of signal to begin the front end definition of the timing of (beginning of decline transition period), and driving force strong non-selection when descending beginning drive the end definition of the timing of beginning by this pulse by a pulse.
Specify the circuit that generates the signal 33,34,35,36 of the output buffer that drives Fig. 6 from rising control signal 24 and decline control signal 25 now with reference to Fig. 7 and Fig. 8.
That is to say that rising control signal 24 is input to input end 55 as clock 1.Decline control signal 25 is input to input end 57 as clock 2.Reference clock is input to input end 56.For example approximately the continuous clock signal of 1MHz is used as reference clock.
In Fig. 7, the rise detection of rising control signal is carried out by first dff circuit 40, second dff circuit 41 and first "AND" circuit 42.
That is to say, as shown in Figure 8, obtain the logical multiply of the output of the output of first dff circuit 40 shown in Figure 7 and second dff circuit 41, and obtain rising regularly the rising signals 72 of expression as the clock 1 of rising control signal 24.
Similarly, although omitted its waveform, the decline of rising control signal detects by the 3rd dff circuit 43, the 4th dff circuit 44 and second "AND" circuit 45, and obtains the decline signal regularly of expression rising control signal 24.For the signal of the clock 2 of conduct decline control signal 25, rise detection is carried out by the 5th dff circuit 46, the 6th dff circuit 47 and the 3rd "AND" circuit 48, and obtains the signal of the rising of expression decline control signal 25.
The detection that descends uses the 7th dff circuit 49, the 8th dff circuit 50 and the 4th "AND" circuit 51 to carry out, and obtains the signal of the decline of expression decline control signal.Obtain four signals that expression clock 1 and clock 2 rise and descend thus.
The n line that the output of the one JKFF circuit 52 of the output by derive using first "AND" circuit 42 from these signals and the output of the 3rd "AND" circuit 48 and the logical multiply of n line shifted data the obtain Fig. 5 weak drive signal 36 that rises, and control signal 33 a little less than obtaining the n line and descend by this signal of counter-rotating.
Similarly, the n line that the output of the 2nd JKFF circuit 53 of the output by derive using second "AND" circuit 45 and the output of the 3rd "AND" circuit 48 and the logical multiply of n line shifted data the obtain Fig. 5 strong drive signal 35 that rises, and the reverse signal acquisition n line of the logical multiply of the output of the 3rd JKFF circuit 54 of the output of output by using first "AND" circuit 42 and the 4th "AND" circuit 51 and the n line shifted data strong drive signal 34 that descends.
Similarly, by using n+1 line shifted data and n+2 line shifted data to substitute n line shifted data acquisition each control signal at n+1 line, n+2 line.
In the first above-mentioned embodiment, described the Waveform generation method that uses reference clock to rise and descend, but needn't be subject to this, but the method that can use detections such as adopting difference channel to rise and descend obtains similar effects by detection.
As mentioned above, because mutual inductance between the scanning lines and the noise that causes of electrostatic capacitance are scurried into the revolution rate of waveform that can be by the control transition period suppresses.Therefore, the decline transition period of the rising transition period of n line drive waveforms (C) and n+1 line drive waveforms (C) can be overlapping.Thereby, can suppress lowering of luminance.
Because surface conductive radiated element 3a has along with the impedance that applies potential change, and differ from one another for the flow suctor (sink) of scan drive cell 5 and each needed driving force of current source (source), the impedance of flow suctor and current source is different thus.Therefore, only transition period for rise with descend need not to be the identical time.
In this case, by using two control signals of two transmission lines transmission, use the front end of the pulse of a control signal in two control signals and front end and four timings of terminal definition of the pulse of terminal and another control signal.
Specifically, as shown in Figure 5, by the pulse width of control decline control signal and rising control signal or the position relation of decline control signal and rising control signal, the waveform of transition period seamlessly transits, and handles when can realize rising waveform and falling waveform.In first embodiment, described the configuration of one of select progressively scanning lines one time, but as the configuration of selecting two of two scanning lines and select progressivelys simultaneously, also can be the configuration of selecting the multi-strip scanning wiring simultaneously.In addition, preferably adopt the configuration of one of select progressively scanning lines (line) a time for meticulous demonstration.
(second embodiment)
Matrix driving device according to second embodiment of the invention will be described now.Fig. 9 illustrates the control timing figure according to the scan drive cell 5 of the matrix driving device of second embodiment.
That is to say, when the characteristic because of the panel load makes optimum rising transit time identical with optimum decline transit time, in the time of can ignoring though perhaps optimum rising transit time is different with optimum decline transit time, rise control from start to end (" control of rising finishes " specifically refers to begin to drive with big driving force when rising beginning) and the control that descends (" control that descends finishes " refers to that specifically big driving force begins driving when beginning than decline) can be overlapping fully from start to end.Here, " overlapping fully " rising transition period of referring to the decline control period of predetermined line and next bar line begins simultaneously and finishes simultaneously.
As shown in Figure 9, in a second embodiment, make the pulse width of decline control signal 25 and the pulse width of rising control signal 24 have identical pulse width and control timing unanimity.Other configuration is identical with first embodiment with operation, the description of omitting same parts thus.
At first, in same timing and when having identical pulse width, n line drive waveforms is carried out from the non-transition of choosing selection simultaneously from choosing non-selected transition and n+1 line, as shown in Figure 9 in decline control signal and rising control signal.
In this case, the decline control signal is consistent with the rising control signal, is formed by individual signals.In this case, the control signal that is used to carry out the control of revolution rate only need to rise control signal 24 or decline control signal 25.
In addition, as illustrating in first embodiment, the rising control signal also can be used as the shift clock signal.Specifically, the shift clock signal can be used as control signal, and two front end and terminal definition that timing can be passed through a pulse of shift clock.
Select the decline of signal to begin, just arrive the beginning of transition of the non-selection current potential of n line, and the rising of selection signal begins, just arrive the beginning of transition of the selection current potential of n+1 line, according to an execution in two timings; And the beginning that the end of the decline transition period of the selection signal of n line or the strong non-selection of driving force when descending beginning than the selection signal of n line drive and (n+1) end of the rising transition period of the selection signal of line or the beginning that the strong selection of driving force when beginning than the rising of the selection signal of (n+1) line drives are regularly carried out according to another.
Alternately, can adopt the configuration that provides, except shift clock, also is used as the control signal of rising control signal 24 and decline control signal 25 from control module 4.
(the 3rd embodiment)
Now the third embodiment of the present invention will be described.Figure 10 illustrates the control timing figure according to the scan drive cell 5 of the matrix driving device of the 3rd embodiment.In the 3rd embodiment, at the only rising transition period of drive waveforms and only decline transition period not simultaneously, the timing when n line drive waveforms is finished from choosing non-selected transition and (n+1) timing of line when the non-transition of choosing selection finishes be same timing.
The decline of decline control signal as shown in figure 10, is regularly regularly identical in the 3rd embodiment with the decline of rising control signal.Therefore, by the pulse width of broadening decline control signal, has the start time that transition early is set from choosing non-selected transition for a long time.Thereby the timing that transition finishes becomes identical, and makes the driving of modulating wiring after transition finishes immediately become possibility.As a result, can increase during the selection of scanning lines 2, and can suppress to show the decline of briliancy.
As mentioned above, regularly regularly identical with the decline of the rising control signal situation of decline of decline control signal has been described, but the rising of the control signal that descends regularly regularly also can be identical with the rising of rising control signal in the 3rd embodiment.In this case, make the n line select the start time of transition identical with (n+1) line from non-choosing from start time of choosing non-selection transition, thereby make that the driving of modulation wiring becomes possibility before just beginning, similar with the 3rd embodiment.As a result, can increase during the selection of scanning lines 2, and can suppress to show the decline of briliancy.
(television equipment)
The television equipment of the matrix driving device that uses above-mentioned first to the 3rd embodiment will be described now.Figure 11 uses the television equipment of the matrix driving device of above-mentioned first to the 3rd embodiment.
As shown in figure 11, this television equipment is configured to comprise: receiving circuit 120 is provided with broadcast singal tuner 120a; Graphics processing unit; And display device 125, comprise control module 122, comprise the driving circuit 123 and the display panel 124 of above-mentioned matrix driving device.
Receiving circuit 120 is configured to comprise broadcast singal tuner 120a, demoder etc.Receiving circuit 120 receives TV signal such as satellite broadcasting or ground waves, the data broadcasting by network etc., and the picture data behind the output decoder is given graphics processing unit 121.
Receiving circuit 120 and graphics processing unit 121 can be contained in the casing that is independent of display device 125 as set-top box (STB) 126, perhaps can be contained in the casing that integrates with display device 125, perhaps also can adopt the various array configurations outside the above-mentioned form.
Understood embodiments of the invention specifically, but the present invention is not limited only to this, can carry out various modification according to technological concept of the present invention.
Contain liquid crystal indicator, plasma display system, electron beam display device or the like according to matrix driving device of the present invention and driving method thereof.Application of the present invention is particularly useful for plasma display system or electron beam display device, especially the characteristic that increases at output briliancy and voltage application time with being directly proportional.
According to the present invention, can suppress owing to shorten during the demonstration that exists transition period to cause.
Claims (5)
1. a scanister is used to scan the multi-strip scanning wiring, comprising:
Sweep circuit, described sweep circuit has: first output unit, between the first phase, the conducting current potential is changed into stopping potential; And second output unit, in the second phase stopping potential is changed into the conducting current potential, wherein, at least a portion of a scanning lines between the first phase and at least a portion second phase of next the bar scanning lines that is adjacent overlapping;
Control circuit is used at described sweep circuit, provide definition between the first phase beginning and first control signal of end, and the beginning of the definition second phase and second control signal of end;
First transmission line is used for first control signal is transferred to described sweep circuit from described control circuit; And
Second transmission line is used for second control signal is transferred to described sweep circuit from described control circuit.
2. according to the scanister of claim 1, wherein in first control signal and second control signal also as clock signal, is used to define the timing that is used to switch scanning lines to be selected.
3. a scanister is used to scan the multi-strip scanning wiring, comprising:
Sweep circuit, described sweep circuit has: first output unit, between the first phase, the conducting current potential is changed into stopping potential; And second output unit, in the second phase stopping potential is changed into the conducting current potential, wherein, at least a portion of a scanning lines between the first phase and at least a portion second phase of next the bar scanning lines that is adjacent overlapping;
Control circuit is used at described sweep circuit, and beginning and end and the beginning of the definition second phase and the control signal of end between the definition first phase are provided; And
Transmission line is used for control signal is transferred to described sweep circuit from described control circuit, and wherein said control signal also as clock signal, is used to define the timing that is used to switch scanning lines to be selected.
4. image display device comprises:
Described scanister according to claim 1;
The multi-strip scanning wiring;
Many modulation wirings are provided with modulation signal;
A plurality of matrix of display elements are connected with described many modulation wirings by described multi-strip scanning wiring; And
Modulation circuit is used for providing modulation signal to the modulation wiring.
5. television equipment comprises:
Image display device according to claim 4;
Tuner is used to select television broadcasting signal;
Wherein, carrying out image according to the signal from tuner output shows.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005128077 | 2005-04-26 | ||
| JP2005128077 | 2005-04-26 | ||
| JP2006112036 | 2006-04-14 |
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| CN1881390A CN1881390A (en) | 2006-12-20 |
| CN100587770C true CN100587770C (en) | 2010-02-03 |
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| CN200610077090A Expired - Fee Related CN100587770C (en) | 2005-04-26 | 2006-04-26 | Scanning circuit, scanning device, image display apparatus and television apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101127199B (en) * | 2007-09-06 | 2010-06-02 | 友达光电股份有限公司 | Gate driver for outputting superposition-free scanning signal, liquid crystal display and method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6597332B1 (en) * | 1999-08-06 | 2003-07-22 | Sony Corporation | Plasma addressing display device |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6597332B1 (en) * | 1999-08-06 | 2003-07-22 | Sony Corporation | Plasma addressing display device |
Non-Patent Citations (2)
| Title |
|---|
| New Adressing Method Using Overlapping ScanTimeofAC-PDP. Gun-Su Kim,Jeong-Hyun Seo,Seok-Hyun Lee.IEEE TRANSACTIONS ON ELECTRON DEVICES,Vol.52 No.1. 2005 |
| New Adressing Method Using Overlapping ScanTimeofAC-PDP. Gun-Su Kim,Jeong-Hyun Seo,Seok-Hyun Lee.IEEE TRANSACTIONS ON ELECTRON DEVICES,Vol.52 No.1. 2005 * |
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| CN1881390A (en) | 2006-12-20 |
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