CN101685606B - Method for regulating and generating scanning signal as well as driving device applying same - Google Patents
Method for regulating and generating scanning signal as well as driving device applying same Download PDFInfo
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- CN101685606B CN101685606B CN2008101683344A CN200810168334A CN101685606B CN 101685606 B CN101685606 B CN 101685606B CN 2008101683344 A CN2008101683344 A CN 2008101683344A CN 200810168334 A CN200810168334 A CN 200810168334A CN 101685606 B CN101685606 B CN 101685606B
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Abstract
The invention relates to a method for regulating and generating scanning signals as well as a driving device applying same, which is applied to a scanning line driving device, and the scanning line driving device is used to respectively output a scanning signal to multiple scanning lines connected with a display panel. The method comprises the following steps: firstly measuring a starting point of a rising edge and a finishing point of a falling edge of a duty cycle of each scanning signal; then computing the difference between the finishing point of the falling edge of the duty cycle of the previous scanning signal and the starting point of the rising edge of the duty cycle of the next scanning signal; and finally, regulating the duty cycle of each scanning signal according to the difference to bring forward the finishing point of the duty cycle of the previous scanning signal to the starting point of the duty cycle of the next scanning signal. By adopting the invention, non mutual overlapping of the two scanning signals is achieved so as to avoid the occurrence of crosstalk interference.
Description
Technical field
The present invention relates to a kind of scanning drive method, be meant a kind of scanning drive method of display especially.
Background technology
LCD is because light weight, volume is little and characteristic such as low power consumption, therefore replaces conventional cathode ray tube (CRT) gradually, becomes the main product of monitor market already.And in various LCDs; Super-twist nematic (Super TwistedNematic; Be called for short STN) LCD can compared to twisted nematic (TwistedNematic, TN) LCD has higher contrast ratio, and its manufacturing cost is again far below thin film transistor (TFT) (TFT); Therefore, be widely used in electronic products such as mobile phone, digital camera.
Consult Fig. 1; Be scanning line driver 91 in the existing STN type LCD and the annexation between the panel 92; If panel 92 has N bar display column; Then scanning line driver 91 needs to connect N bar sweep traces (Com1～ComN) is to transmit the N bar display column of sweep signal to panels 92 in regular turn through these sweep traces.But; Because each scanning line driver 91 is different to the track lengths of panel 92; So the suffered non-ideal effects of each bar sweep trace (for example load effect etc.) is not quite similar; Cause each sweep trace that sweep signal is had decay in various degree, that is from panel 92 recently and the shortest sweep trace Com1 of cabling to sweep signal to influence meeting minimum; Otherwise, from panel 92 farthest and the longest sweep trace ComN of cabling the most serious to the decay meeting of sweep signal.
Therefore, existing solution be width with each sweep trace along with the distance of cabling is widened gradually, reduce the signal attenuation that non-ideal effects causes; But; Can't change because the kind of panel is many and the trace width of sweep trace is just fixing during fabrication, therefore, existing method can't change to various panel again; And it is increasing to work as panel size; The width of cabling also will increase and more and more wideer along with the quantity of sweep trace, cause the increase of cost and area, so existing method still remains to be improved part.
Summary of the invention
The objective of the invention is is providing a kind of method that can avoid the dutycycle of the adjustment sweep signal that overlapping phenomenon appears in two adjacent sweep signals.
The present invention provides a kind of production method of sweep signal of display; Be applied to one scan line drive unit; This scanning line driver is given a plurality of sweep traces that are connected with a display pannel in order to export the one scan signal respectively; The production method of the sweep signal of this display comprises: step a: the numerical information of the dutycycle of corresponding each sweep signal of record, and said numerical information can make the terminal point of the dutycycle falling edge of last sweep signal shift to an earlier date the starting point of the dutycycle rising edge of next sweep signal; And step b: make the said numerical information of this scanning line driver, produce and export the respectively sweep signal of this sweep trace to according to step a record.
The production method of the sweep signal of display of the present invention, among its step a, said sweep signal can be divided into groups by the mode that with a plurality of adjacent sweep signals is a group, and the said sweep signal in same group is used identical dutycycle length.
The method that the present invention adjusts the dutycycle of sweep signal is to be applied to one scan line drive unit, and this scanning line driver is given a plurality of sweep traces that are connected with a display pannel in order to export the one scan signal respectively, and this method comprises:
Step a: measure the respectively starting point of the dutycycle rising edge of this sweep signal and the terminal point of falling edge;
Step b: calculate the gap between the starting point of dutycycle rising edge of terminal point and next sweep signal of dutycycle falling edge of last sweep signal; And
Step c: according to this gap, adjust the dutycycle of each sweep signal, make the terminal point starting point of the dutycycle rising edge of this next sweep signal in advance of the dutycycle falling edge of this last sweep signal.
Among its step c; Adjust the mode of the dutycycle starting point of this sweep signal dutycycle falling edge ahead of time capable of using of each sweep signal and reduce the dutycycle of this sweep signal, and the time of doing sth. in advance is more than or equal to the gap between the starting point of the rising edge of the terminal point of this sweep signal dutycycle falling edge and this next one sweep signal dutycycle; Also can utilize the starting point that postpones this sweep signal dutycycle rising edge to reduce the dutycycle of this sweep signal, and the time that postpones is more than or equal to the gap between the starting point of the dutycycle rising edge of the terminal point of the dutycycle falling edge of a sweep signal on this and this sweep signal.
Certainly; Can also be to utilize the starting point that postpones this sweep signal dutycycle rising edge; And ahead of time the starting point of this sweep signal dutycycle falling edge is reduced the dutycycle of this sweep signal, and postpone and the sum total of time ahead of time more than or equal to the gap between the starting point of the dutycycle rising edge of the terminal point of the dutycycle falling edge of this sweep signal and this next one sweep signal.
The present invention provides a kind of production method of sweep signal of display in addition; Be applied to one scan line drive unit; This scanning line driver is given a plurality of sweep traces is connected with a display pannel in order to export the one scan signal respectively, and the production method of the sweep signal of this display comprises: step a: measurement is the starting point of the dutycycle rising edge of this sweep signal and the terminal point of falling edge respectively; Step b: calculate the gap between the starting point of dutycycle rising edge of terminal point and next sweep signal of dutycycle falling edge of last sweep signal; Step c: according to this gap; Adjust the dutycycle of each sweep signal; Make the terminal point starting point of the dutycycle rising edge of this next sweep signal in advance of the dutycycle falling edge of this last sweep signal, and with the dutycycle of each sweep signal mode record with numerical information; And steps d: the said numerical information that makes this scanning line driver write down according to step c produces and exports the respectively sweep signal of this sweep trace to.
The production method of the sweep signal of display of the present invention, among its step c, said sweep signal can be divided into groups by the mode that with a plurality of adjacent sweep signals is a group, and the said sweep signal in same group is used identical dutycycle.
The production method of the sweep signal of display of the present invention; Among its step c; Be to utilize ahead of time the starting point of the dutycycle falling edge of this last sweep signal to reduce the dutycycle of this last sweep signal, and the time of doing sth. in advance is more than or equal to the gap between the starting point of the dutycycle rising edge of the terminal point of the dutycycle falling edge of this last sweep signal and this next one sweep signal.
The production method of the sweep signal of display of the present invention; Among its step c; Be the dutycycle that the starting point that utilize to postpone the dutycycle rising edge of this next sweep signal is reduced this next sweep signal, and the time that postpones is more than or equal to the gap between the starting point of the dutycycle rising edge of the terminal point of the dutycycle falling edge of this last sweep signal and this next sweep signal.
The production method of the sweep signal of display of the present invention; Among its step c; It is the starting point of utilizing the dutycycle rising edge that postpones this last sweep signal; And ahead of time the starting point of the dutycycle falling edge of this last sweep signal is reduced the dutycycle of this last sweep signal, and postpone and the sum total of time ahead of time more than or equal to the gap between the starting point of the dutycycle rising edge of the terminal point of the dutycycle falling edge of this last sweep signal and this next one sweep signal.
Another object of the present invention is can produce the scanning line driver of avoiding two adjacent sweep signals overlapping phenomenon to occur providing a kind of.
Scanning line driver of the present invention is to give a plurality of sweep traces that are connected with a display pannel in order to export the one scan signal in regular turn, and comprises a storage element and one scan signal generation unit.Storage element is in order to the numerical information of the dutycycle that stores corresponding each sweep signal, and these numerical informations can make the terminal point of the dutycycle falling edge of last sweep signal shift to an earlier date the starting point of the dutycycle rising edge of next sweep signal.And the sweep signal that the sweep signal generation unit can be coupled to storage element and generation exports each sweep trace to according to numerical information.
Preferably, sweep signal generation unit of the present invention also comprises a counter, and the sweep signal generation unit can be chosen each sweep trace according to the count value of counter, and reads out the numerical information of the dutycycle of corresponding sweep signal from storage element.
Scanning line driver of the present invention, the sweep signal of stored corresponding said sweep trace is divided into a plurality of groups in this storage element, and the dutycycle of every group of sweep signal is identical.
The present invention provides a kind of display, and this display comprises: a display pannel; One scan line drive unit; And a plurality of sweep traces, couple this display pannel and this scanning line driver in regular turn with arranging; This scanning line driver comprises that one stores the storage element of numerical information of the dutycycle of corresponding each sweep signal; And one be coupled to this storage element and produce according to said numerical information and export the respectively sweep signal generation unit of the sweep signal of this sweep trace to, and said numerical information makes the terminal point of dutycycle falling edge of last sweep signal shift to an earlier date the starting point of the dutycycle rising edge of next sweep signal.
Display of the present invention, this sweep signal generation unit comprises a counter, this sweep signal generation unit can be chosen respectively this sweep trace according to the count value of this counter, and reads out the numerical information of the dutycycle of corresponding sweep signal from this storage element.
Display of the present invention, the sweep signal of stored corresponding said sweep trace is divided into a plurality of groups in this storage element, and the dutycycle of every group of sweep signal is identical.
Display of the present invention, this display are super-twist nematic liquid crystal display.
Beneficial effect of the present invention is: can the sweep signal of two adjacent scanning lines not overlapped each other, reach the phenomenon of avoiding causing occurring because of cross-talk ghost.
Description of drawings
Fig. 1 is a circuit box synoptic diagram, and drive unit and the annexation between the panel in the available liquid crystal display are described;
Fig. 2 is a circuit box synoptic diagram, and the annexation between scanning line driver of the present invention and the panel is described;
Fig. 3 is a sequential chart, and desirable and actual two adjacent sweep signals are described;
Fig. 4 is a process flow diagram, explains that the present invention adjusts the also preferred embodiment of the method for corresponding generation sweep signal of dutycycle of sweep signal;
Fig. 5 is a circuit box synoptic diagram, and the inner structure of scanning line driver of the present invention is described;
Fig. 6 is a sequential chart, explain sweep signal of the present invention dutycycle the corresponding numerical code that stores, wherein be to adjust with the mode that shifts to an earlier date;
Fig. 7 is a sequential chart, explains that the present invention adjusts the method for the dutycycle of sweep signal, wherein is to adjust with the mode that shifts to an earlier date;
Fig. 8 is a sequential chart, explain sweep signal of the present invention dutycycle the corresponding numerical code that stores, wherein be to adjust with the mode that postpones;
Fig. 9 is a sequential chart, explains that the present invention adjusts the method for the dutycycle of sweep signal, wherein is to adjust with the mode that postpones.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is elaborated.
Consult Fig. 2; The scanning line driver 1 of present embodiment is to be applied to super-twist nematic (Super Twisted Nematic; Be called for short STN) LCD 2; Give a plurality of sweep traces that are connected with a display pannel 3 in order to export the one scan signal respectively; That is to say that if panel 3 has N bar display column then scanning line driver 1 needs N bar sweep trace (Com1～ComN) correspondence is connected to respectively this display column one to one, to transmit this N bar display column of sweep signal to panels 3 through these sweep traces.
3 track lengths is different because each sweep trace is from scanning line driver 1 to panel; So the suffered non-ideal effects of each bar sweep trace (for example load effect etc.) is not quite similar; Cause each sweep trace that sweep signal is had decay in various degree; Cooperate and consult Fig. 3, be the ideal and the actual sweep signal synoptic diagram of wantonly two adjacent scanning lines, wherein; S1 and S2 are the desirable sweep signal of wantonly two adjacent scanning lines, and S3 and S4 then are that in fact corresponding respectively S1 and S2 receive non-ideal effects influence sweep signal afterwards.On the ideal, the dutycycle of sweep signal S1 is from time point t
31To t
32, but in fact sweep signal can receive the influence of non-ideal effects, causes the time of discharging and recharging slack-off, so sweep signal S3 is at time point t
31Rise from low level, but it drops to low level time point t
33But than time point t
32Postponed t
32To t
33Time; Identical ground, the dutycycle of desirable sweep signal S2 is from time point t
32To t
34, but in fact sweep signal S4 but is from time point t
32Be deferred to time point t
35
Therefore, when sweep signal S3 did not drop to low level as yet, sweep signal S4 but will rise to high level from low level, caused can producing each other one overlapping (overlap) interval, and the width of this overlapping interval is t among the figure
32To t
33Time, make the display column of corresponding sweep signal S4 when showing because the display column of corresponding sweep signal S3 do not close fully, can receive the interference of adjacent display column and cross-talk (crosstalk) phenomenon takes place and ghost occurs.And, from panel 3 recently and the shortest sweep trace Com1 of cabling to sweep signal to influence meeting minimum, the time that just discharges and recharges is fast more, the overlapping interval that is produced is more little; Otherwise, from panel 3 farthest and the longest sweep trace ComN of cabling the most serious to the decay meeting of sweep signal, the overlapping interval that is produced also can be maximum.
In order to solve above-mentioned two adjacent sweep signals, therefore, cooperate and consult Fig. 4 owing to the phenomenon that cross-talk takes place between the overlapping adjacent display column that causes panel 3; Preferred embodiment for the production method of the sweep signal of display of the present invention; Wherein mainly be divided into and measure and produce two stages of sweep signal, measuring phases mainly is to predict the overlapping interval of sweep signal earlier, with the reduction of the dutycycle (duty cycle) that determines each sweep signal; Make two scanning signals with adjacent non-overlapping copies each other; Just get into the stage that produces sweep signal afterwards, so that adjusted sweep signal is sent to each sweep trace respectively, this method may further comprise the steps:
Consult Fig. 5, be the circuit block diagram of present embodiment scanning line driver 1, this scanning line driver 1 comprises a storage element 4 and one scan signal generation unit 5.But the storage element 4 of present embodiment can be a storer or the circuit of any storage of digital information; The dutycycle of each sweep signal is that stores with numerical code is in storage element 4; The numerical code of the dutycycle of corresponding each sweep signal can be divided into numerical code and delay numerical code two parts in advance; And in advance signal (front) and an inhibit signal (back) are sent to sweep signal generation unit 5 by one respectively; It is respectively the digital signal of N position, represents the resolution (resolution) of the dutycycle of sweep signal.
Cooperating and to consult Fig. 6, is to be the oscillogram of the ideal scan signal S5 of example with the sweep signal with 4 bit resolutions, and the numerical code in advance of the dutycycle of expression sweep signal S5 respectively is to be stored in the storage element 4 with 4 numerical code with postponing numerical code.The dutycycle of sweep signal S5 is under the situation of not doing any adjustment; In advance numerical code with postpone numerical code and can be 41 (1 represents high level; 0 represents low level); And being sent to the sweep signal generation unit 5 that is coupled to storage element 4 through shifting to an earlier date signal and inhibit signal respectively, this sweep signal generation unit 5 is according to shifting to an earlier date signal and inhibit signal, the corresponding sweep signal that exports each sweep trace to that produces.
Cooperate again and consult Fig. 7 and explain; The waveform that in fact sweep signal S5 among Fig. 7 produces for the sweep signal S5 among Fig. 6, sweep signal S5 and next sweep signal S6 can produce overlapping interval, mainly be sweep signal S5 because receiving non-ideal effects guiding discharge speed slack-off; So that before sweep signal S5 does not discharge end; Sweep signal S6 just arrives display column, therefore, as long as the time point that sweep signal S5 is begun to discharge (is the starting point t of falling edge
74) in advance, sweep signal S5 ' for example is advanced to time point t with time of its discharge
73, sweep signal S5 ' can that is to say the terminal point t of last sweep signal S5 ' falling edge in the sweep signal S6 preceding end that begins to discharge
75Can be in advance in the starting point t of next sweep signal S6 rising edge
76Therefore; Desire to reach the result of sweep signal S5 ', must be with the terminal point of sweep signal falling edge toward reach, so in advance last 21 of numerical code must be changed into 20 by quilt; And, still keep 41 so postpone numerical code because do not adjust the starting point of sweep signal rising edge; In other words, sweep signal generation unit 5 can take out 11111100 numerical data and produce the sweep signal S5 ' among Fig. 7 from storage element 4.What deserves to be mentioned is that the time that sweep signal S5 ' descends in advance must be not less than the gap (t between the starting point of terminal point and sweep signal S6 rising edge of sweep signal S5 falling edge
76To t
77), that is to say when adjustment shifts to an earlier date numerical code, must make t
73To t
74Time interval more than or equal to t
76To t
77Time interval so that under the identical velocity of discharge, two adjacent sweep signals (overlap) phenomenon that just can not overlap.
The mode of the dutycycle of adjustment sweep signal also can be like Fig. 8 and shown in Figure 9, and adjustment sweep signal S6 is sweep signal S6 ', with the starting point t of script sweep signal S6 rising edge
94Be delayed to time point t
96, make the terminal point t of sweep signal S5 falling edge
95Can take the lead the starting point t of sweep signal S6 ' rising edge
96, that is to say corresponding to 21 of the foremosts that is stored in the delay numerical code in the storage element 4 needs to be changed into 20, and the time that makes sweep signal S6 ' can postpone 2 numerical codes just can be unlocked; In addition; Because do not adjust the starting point of falling edge, so numerical code is still kept 41 in advance, that is; In the time will producing sweep signal S6 ', sweep signal generation unit 5 can take out corresponding numerical code 00111111 from storage element 4.Identical ground, sweep signal S6 ' postpones the time of charging, must be more than or equal to the gap (t between the starting point of the terminal point of sweep signal S5 falling edge and sweep signal S6 rising edge
94To t
95), that is to say when adjustment postpones numerical code t
94To t
96Time interval must be more than or equal to t
94To t
95Time interval so that under identical charging rate, two adjacent sweep signals (overlap) phenomenon that just can not overlap.Certainly; Also can utilize above-mentioned dual mode to mix; The starting point of delaying sweep signal S6 (or S5) rising edge simultaneously, and the starting point of falling edge is adjusted the dutycycle of sweep signal in advance is like sweep signal S6 among Fig. 8 " shown in; and if postpone and the sum total of time in advance more than or equal to the falling edge terminal point of adjacent upper and lower two sweep signals and the gap between the rising edge starting point, do not exceed with present embodiment.
In addition, because in the actual conditions, the suffered non-ideal effects of two adjacent scanning lines can be very approaching; To such an extent as to the amount that the dutycycle of two adjacent sweep signals is adjusted may be very little; Therefore, the sweep signal of said sweep trace can be divided into groups by the group's mode that with a plurality of adjacent sweep signals is a group, and the said sweep signal in same group is used identical dutycycle and is stored in the storage element 4; Thus, also can reduce the quantity of the stored dutycycle numerical data of storage element 4.
Above-mentioned steps 61～63 is the stage of the dutycycle of adjustment sweep signal; In the present embodiment, the tester carries out the measurement of sweep signal according to above-mentioned steps to different displays; And measure the terminal point of starting point and falling edge of rising edge of each sweep signal in reality after; Select a kind of each sweep signal of adjusting of above-mentioned three kinds of modes, and the delay numerical code of the dutycycle of adjusted sweep signal and numerical code in advance are stored in the storage element 4, certainly with the mode of artificial burning; Mode that also can firmware (firmware), burning is in the chip of scanning line driver 1.
Consult Fig. 4; In the dutycycle of adjusting sweep signal and after being stored in storage element 4; Display can carry out step 64, produce through adjusted sweep signal that is, in step 64; Sweep signal driver element 1 can take out the dutycycle numerical data of the sweep signal of corresponding each sweep trace from storage element 4, and produces the sweep signal that exports each sweep trace to according to this.
Consult Fig. 5; The sweep signal generation unit 5 of present embodiment also comprises a counter 51, utilizes counter 51 to count to add one mode each time, reaches and chooses each bar sweep trace in regular turn; That is to say that counter 51 count down to N from 1; Can be respectively representative choose the sweep trace (Fig. 2) of Com1 to ComN, and sweep signal generation unit 5 needs only the numerical data that the value counted according to counter 51 goes to read out the dutycycle of pairing sweep signal in the storage element 4 and produces sweep signal, can make respectively this adjacent sweep signal that is produced overlapping phenomenon will can not occur; Can reduce cross-talk effectively, avoid taking place the problem of ghost.Certainly; Each sweep trace is driven being driven of great-jump-forward or multi-strip scanning line while; As long as scanning line driver 1 is according to the corresponding sweep signal that produces of the numerical data of the stored sweep signal dutycycle of storage element 4; Two adjacent sweep signals are not overlapped each other get final product, do not exceed with present embodiment.What deserves to be mentioned is that the count number of counter 51 need be equal to or greater than the quantity of sweep trace, could correspondence count down to each bar sweep trace.
In sum; The method of the dutycycle of the present invention's adjustment and generation sweep signal and drive unit thereof are through suitably reducing the dutycycle of each sweep signal; Reach the sweep signal not overlapping (overlap) between adjacent two sweep traces, the phenomenon that causes ghost to avoid cross-talk (crosstalk) interference takes place.
Claims (18)
1. the production method of the sweep signal of a LCD is applied to one scan line drive unit, and this scanning line driver is given a plurality of sweep traces that are connected with a panel of LCD in order to export the one scan signal respectively, it is characterized in that,
The production method of the sweep signal of this LCD comprises:
Step a: when measuring the display column of each sweep signal arrival correspondence, whether the terminal point of the pulse falling edge of previous sweep signal falls behind the starting point of the pulse rising edge of next sweep signal;
Step b: when the terminal point of the pulse falling edge of measuring previous sweep signal falls behind the starting point of pulse rising edge of next sweep signal, calculate the gap between this terminal point and this starting point;
Step c: according to this gap, adjust the dutycycle of each sweep signal, the terminal point of the pulse falling edge of this last sweep signal is shifted to an earlier date in the starting point of the pulse rising edge of this next sweep signal;
Steps d: the numerical information of the dutycycle of corresponding each sweep signal of record, and said numerical information shifts to an earlier date in the starting point of the pulse rising edge of next sweep signal the terminal point of the pulse falling edge of last sweep signal; And
Step e: make the said numerical information of this scanning line driver, produce and export the respectively sweep signal of this sweep trace to according to the steps d record.
2. the production method of the sweep signal of LCD according to claim 1; It is characterized in that; In its steps d, said sweep signal can be divided into groups by the mode that with a plurality of adjacent sweep signals is a group, and the said sweep signal in same group is used identical dutycycle.
3. the method for the dutycycle of a sweep signal of adjusting LCD is applied to one scan line drive unit, and this scanning line driver is given a plurality of sweep traces that are connected with a panel of LCD in order to export the one scan signal respectively, it is characterized in that,
The method of the dutycycle of the sweep signal of this adjustment LCD comprises:
Step a: measure the respectively starting point of the pulse rising edge of this sweep signal and the terminal point of falling edge;
Step b: calculate the gap between the starting point of pulse rising edge of terminal point and next sweep signal of pulse falling edge of last sweep signal; And
Step c: according to this gap, adjust the dutycycle of each sweep signal, the terminal point of the pulse falling edge of this last sweep signal is shifted to an earlier date in the starting point of the pulse rising edge of this next sweep signal.
4. the method for the dutycycle of the sweep signal of adjustment LCD according to claim 3; It is characterized in that; Among its step c; Be to utilize ahead of time the starting point of the pulse falling edge of this last sweep signal to reduce the dutycycle of this last sweep signal, and the time of doing sth. in advance is more than or equal to the gap between the starting point of the rising edge of the pulse of the terminal point of the pulse falling edge of this last sweep signal and this next sweep signal.
5. the method for the dutycycle of the sweep signal of adjustment LCD according to claim 3; It is characterized in that; Among its step c; Be the dutycycle that the starting point that utilize to postpone the pulse rising edge of this next sweep signal is reduced this next sweep signal, and the time that postpones is more than or equal to the gap between the starting point of the pulse rising edge of the terminal point of the pulse falling edge of this last sweep signal and this next sweep signal.
6. the method for the dutycycle of the sweep signal of adjustment LCD according to claim 3; It is characterized in that; Among its step c; It is the starting point of utilizing the pulse rising edge that postpones this last sweep signal; And ahead of time the starting point of the pulse falling edge of this last sweep signal is reduced the dutycycle of this last sweep signal, and postpone and the sum total of time ahead of time more than or equal to the gap between the starting point of the pulse rising edge of the terminal point of the pulse falling edge of this last sweep signal and this next one sweep signal.
7. the production method of the sweep signal of a LCD is applied to one scan line drive unit, and this scanning line driver is given a plurality of sweep traces that are connected with a panel of LCD in order to export the one scan signal respectively, it is characterized in that,
The production method of the sweep signal of this LCD comprises:
Step a: measure the respectively starting point of the pulse rising edge of this sweep signal and the terminal point of falling edge;
Step b: calculate the gap between the starting point of pulse rising edge of terminal point and next sweep signal of pulse falling edge of last sweep signal;
Step c: according to this gap; Adjust the dutycycle of each sweep signal; The terminal point of pulse falling edge that makes this last sweep signal is in advance in the starting point of the pulse rising edge of this next sweep signal, and with the dutycycle of each sweep signal mode record with numerical information; And
Steps d: the said numerical information that makes this scanning line driver write down according to step c produces and exports the respectively sweep signal of this sweep trace to.
8. the production method of the sweep signal of LCD according to claim 7; It is characterized in that; Among its step c, said sweep signal can be divided into groups by the mode that with a plurality of adjacent sweep signals is a group, and the said sweep signal in same group is used identical dutycycle.
9. the production method of the sweep signal of LCD according to claim 7; It is characterized in that; Among its step c; Be to utilize ahead of time the starting point of the pulse falling edge of this last sweep signal to reduce the dutycycle of this last sweep signal, and the time of doing sth. in advance is more than or equal to the gap between the starting point of the pulse rising edge of the terminal point of the pulse falling edge of this last sweep signal and this next one sweep signal.
10. the production method of the sweep signal of LCD according to claim 7; It is characterized in that; Among its step c; Be the dutycycle that the starting point that utilize to postpone the pulse rising edge of this next sweep signal is reduced this next sweep signal, and the time that postpones is more than or equal to the gap between the starting point of the pulse rising edge of the terminal point of the pulse falling edge of this last sweep signal and this next sweep signal.
11. the production method of the sweep signal of LCD according to claim 7; It is characterized in that; Among its step c; Be the starting point that utilize to postpone the pulse rising edge of this last sweep signal, and the starting point of the pulse falling edge of this last sweep signal is reduced the dutycycle of this last sweep signal ahead of time, and postpone and the sum total of time ahead of time more than or equal to the gap between the starting point of the pulse rising edge of the terminal point of the pulse falling edge of this last sweep signal and this next one sweep signal.
12. a scanning line driver is given a plurality of sweep traces that are connected with a panel of LCD in order to export the one scan signal in regular turn, it is characterized in that,
This scanning line driver comprises:
One storage element, in order to the numerical information of the dutycycle that stores corresponding each sweep signal, said numerical information makes the terminal point of pulse falling edge of last sweep signal in advance in the starting point of the pulse rising edge of next sweep signal; And
One scan signal generation unit is coupled to this storage element and exports the respectively sweep signal of this sweep trace to according to said numerical information generation;
Wherein, the dutycycle of each sweep signal corresponding with said numerical information is obtained by following steps:
Step a: starting point and the terminal point of falling edge of measuring the pulse rising edge of each sweep signal;
Step b: calculate the gap between the starting point of pulse rising edge of terminal point and next sweep signal of pulse falling edge of last sweep signal;
Step c: according to this gap, adjust the dutycycle of each sweep signal, the terminal point of the pulse falling edge of this last sweep signal is shifted to an earlier date in the starting point of the pulse rising edge of this next sweep signal.
13. scanning line driver according to claim 12; It is characterized in that; This sweep signal generation unit comprises a counter; This sweep signal generation unit is chosen respectively this sweep trace according to the count value of this counter, and reads out the numerical information of the dutycycle of corresponding sweep signal from this storage element.
14. scanning line driver according to claim 12 is characterized in that, the sweep signal of stored corresponding said sweep trace is divided into a plurality of groups in this storage element, and the dutycycle of every group of sweep signal is identical.
15. a LCD is characterized in that,
This LCD comprises:
One panel of LCD;
One scan line drive unit; And
A plurality of sweep traces couple this panel of LCD and this scanning line driver in regular turn with arranging;
This scanning line driver comprises that one stores the storage element of numerical information of the dutycycle of corresponding each sweep signal; And one be coupled to this storage element and produce according to said numerical information and export the respectively sweep signal generation unit of the sweep signal of this sweep trace to, and said numerical information makes the terminal point of pulse falling edge of last sweep signal in advance in the starting point of the pulse rising edge of next sweep signal;
Wherein, the dutycycle of each sweep signal corresponding with said numerical information is obtained by following steps:
Step a: starting point and the terminal point of falling edge of measuring the pulse rising edge of each sweep signal;
Step b: calculate the gap between the starting point of pulse rising edge of terminal point and next sweep signal of pulse falling edge of last sweep signal;
Step c: according to this gap, adjust the dutycycle of each sweep signal, the terminal point of the pulse falling edge of this last sweep signal is shifted to an earlier date in the starting point of the pulse rising edge of this next sweep signal.
16. LCD according to claim 15; It is characterized in that; This sweep signal generation unit comprises a counter; This sweep signal generation unit is chosen respectively this sweep trace according to the count value of this counter, and reads out the numerical information of the dutycycle of corresponding sweep signal from this storage element.
17. LCD according to claim 15 is characterized in that, the sweep signal of stored corresponding said sweep trace is divided into a plurality of groups in this storage element, and the dutycycle of every group of sweep signal is identical.
18. LCD according to claim 15 is characterized in that, this LCD is a super-twist nematic liquid crystal display.
Priority Applications (1)
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| CN111354294B (en) * | 2020-04-10 | 2022-09-02 | 京东方科技集团股份有限公司 | Display panel, display method thereof and display device |
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| CN101127199A (en) * | 2007-09-06 | 2008-02-20 | 友达光电股份有限公司 | Gate driver for outputting superposition-free scanning signal, liquid crystal display and method |
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