CN103187018B - Active array display and scan line drive circuit thereof and scanning line driving method - Google Patents
Active array display and scan line drive circuit thereof and scanning line driving method Download PDFInfo
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- CN103187018B CN103187018B CN201110453548.8A CN201110453548A CN103187018B CN 103187018 B CN103187018 B CN 103187018B CN 201110453548 A CN201110453548 A CN 201110453548A CN 103187018 B CN103187018 B CN 103187018B
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Abstract
The invention provides a kind of scanning line driving method of active array display, comprise: the multi-strip scanning line of described active array display is divided into S group, every bar sweep trace connects a scanning lead-in wire, S-1 bar sweep trace of being often separated by between adjacent scanning lines in group, S >=2, S is integer; The scanning lead-in wire connected the multi-strip scanning line of described active array display applies drive singal line by line, and the brightness of the row pixel making in each group M article of sweep trace corresponding matches.In addition, the present invention also provides a kind of scan line drive circuit of active array display and comprises the active array display of this driving circuit.Adopt technical scheme of the present invention, the problem that each sweep trace display effect of existing active array display is different can be solved.
Description
Technical field
The present invention relates to display field, particularly relate to a kind of active array display, the scanning line driving method of this active array display, the scan line drive circuit of this active array display.
Background technology
Existing active array display comprises pel array, the multi-strip scanning line be connected with this pel array and a plurality of data lines be connected with this pel array, each pixel comprises pixel electrode and thin film transistor (TFT) TFT, this pixel electrode couples with corresponding sweep trace and data line by thin film transistor (TFT) TFT that (namely pixel electrode is electrically connected with the drain electrode of TFT, sweep trace is electrically connected with the grid of TFT, and data line is electrically connected with the source electrode of TFT).In procedure for displaying, the scan line drive circuit (being generally integrated circuit (IC)) of active array display opens the TFT of each row pixel line by line, and the data line drive circuit of active array display is opened device in every a line pixel TFT and applied pixel voltage to the pixel electrode of this row pixel.
In prior art, active array display has viewing area (ACTIVEAREA, pel array is arranged at viewing area) and non-display area (FAN-OUTAREA), each sweep trace comprises the main scanning line being positioned at viewing area and the scanning being positioned at non-display area lead-in wire, and drive singal is applied to the main scanning line of viewing area by scan line drive circuit by scanning lead-in wire.Can distortion be there is in the scan line driving signal that scan line drive circuit exports after overscanning lead-in wire, because the scanning lead resistance of each bar sweep trace is not identical, the distortion level of corresponding scan line driving signal is just different, and then cause the leaping voltage (kick-backvoltage) of each row pixel also different, finally cause the horizontal band of image appearance that the brightness of adjacent lines pixel is different, show.
In order to eliminate above-mentioned horizontal band, the resistance by the length, material etc. of the scanning lead-in wire of adjustment each bar sweep trace, the scanning of each bar sweep trace being gone between in prior art mates as much as possible.But due to the restriction of technique and material, the resistance exact matching making the scanning of each bar sweep trace go between is very difficult, and horizontal band is difficult to eliminate well.
Summary of the invention
The technical problem to be solved in the present invention is that the resistance of the scanning lead-in wire of each bar sweep trace in existing active array display is difficult to exact matching, and horizontal band is difficult to eliminate well.
For solving the problem, the invention provides a kind of scanning line driving method of active array display, comprising:
The multi-strip scanning line of described active array display is divided into S group, and every bar sweep trace connects a scanning lead-in wire, S-1 bar sweep trace of being often separated by between adjacent scanning lines in group, S >=2, and S is integer;
The scanning lead-in wire connected the multi-strip scanning line of described active array display applies drive singal line by line, and the brightness of the row pixel making in each group M article of sweep trace corresponding matches, and M is positive integer.
Alternatively, the match method that adopts of the brightness of the row pixel making in each group M article of sweep trace corresponding is that leaping voltage by controlling in each group row pixel corresponding to M article of sweep trace matches and realizes.
Alternatively, the match method that adopts of the leaping voltage of the row pixel making in each group M article of sweep trace corresponding is the pulse waveform of the drive singal regulating the scanning lead-in wire connected M article of sweep trace in each group to apply.
Alternatively, the method for the pulse waveform of described adjustment drive singal comprises one of them or its combination of following A, B, C method:
A, use stepped pulse waveform;
B, regulate the pulse height of described pulse waveform;
C, the rise time changing described pulse waveform and/or fall time.
Alternatively, described stepped pulse waveform comprises the first high level and the second high level, and described first high level is greater than described second high level.
Alternatively, during the stepped pulse waveform of described use, by increasing the duration of described second high level and/or reducing the described leaping voltage of size realization reduction of described second high level, by reducing the duration of described second high level and/or increasing the described leaping voltage of size realization increase of described second high level.
Alternatively, described pulse waveform is the waveform formed by single high level.
Alternatively, during the pulse waveform that described use is formed by single high level, realize reducing described leaping voltage by the size reducing described single high level, realize increasing described leaping voltage by the size increasing described single high level.
Alternatively, the number of described sweep trace divides exactly divided group number S.
Alternatively, described S is even number.
Alternatively, the pulse waveform of the drive singal that the scanning lead-in wire that M article of sweep trace connects in each group is corresponding is different.
Alternatively, the pulse waveform of the drive singal that the scanning lead-in wire that each bar sweep trace connects in same group is corresponding is identical.
The present invention also provides a kind of active array display to comprise multi-strip scanning line, and every bar sweep trace connects a scanning lead-in wire, and described multi-strip scanning line is divided into S group, S-1 bar sweep trace of being often separated by between adjacent scanning lines in group, S >=2, and S is integer;
Described scan line drive circuit comprises:
S pulse waveform generation module, the scanning lead-in wire connected respectively to described S group sweep trace provides pulse waveform;
Shift register, the scanning lead-in wire connected to the multi-strip scanning line of described active array display for controlling described S pulse waveform generation module exports described pulse waveform line by line.
Alternatively, described in each, pulse waveform generation module comprises:
Timer, its time-count cycle is H;
Register, for parameter storage time;
Comparer, makes comparisons with described time parameter between being clocked by described timer, exports comparative result;
First multiplexer, there are two input ends connecting the first high level and the second high level respectively, and the control end to be connected with described comparator output terminal, the comparative result that described first multiplexer exports according to described comparer is repeat the pulse waveform that output first high level and the second high level formed the cycle with H;
Multiple second multiplexer, second multiplexer described in each has two input ends connecting low level and described first multiplexer output terminal respectively, and the control end to be connected with the corresponding output end of described shift register, the scanning lead-in wire output packet that described multiple second multiplexer connects to corresponding sweep trace under the control of described shift register is containing the pulse waveform of the first high level and the second high level.
Alternatively, in described pulse waveform generation module, the number of the second multiplexer equals the number of scanning lines in the scanline groups that is attached thereto.
Alternatively, it is by making the corresponding output terminal of described shift register export opening signal that described shift register controls described multiple second multiplexer to the described pulse waveform of scanning lead-in wire output that corresponding sweep trace connects, the control end of described second multiplexer is under the control of described opening signal, and output terminal exports described pulse waveform.
Alternatively, described scan line drive circuit also comprises the first high level generation unit, the second high level generation unit and low level generation unit, all first multiplexers share described first high level generation unit and described second high level generation unit, and all second multiplexers share described low level generation unit.
Alternatively, the voltage of described first high level generation unit, the second high level generation unit generation is adjustable respectively.
Alternatively, the time parameter of described register memory storage is adjustable.
In addition, the present invention also provides a kind of active array display in addition, comprises the scan line drive circuit of the active array display of foregoing description.
Alternatively, described active array display also comprises pel array, and the multi-strip scanning line be connected with described pel array; Described in each, sweep trace is positioned at viewing area, and every one scan lead-in wire is positioned at non-display area.
Alternatively, described active array display is liquid crystal display or organic light emitting display.
Compared with prior art, the present invention has the following advantages: first the multi-strip scanning line of active array display is divided into S group, and every bar sweep trace connects a scanning lead-in wire, S-1 bar sweep trace of being often separated by between adjacent scanning lines in group, S >=2, and S is integer, the top of such as display is the 1st article of sweep trace, in downward direction be followed successively by along display ... S article, S+1 article, ... 2S article, 2S+1 article, ... 3S article ..., wherein, article 1, S+1 article, 2S+1 article, ... be first group, ..., S article, 2S article, 3S article, ... be S group, ..., the 1st article of sweep trace on display often in group is: the 1st article, ..., S article, this row pixel that S bar sweep trace is corresponding is altogether in fact adjacent, M article of sweep trace often in group is: (M-1) × S+1 article, ..., M × S article, this row pixel that S bar sweep trace is corresponding is altogether in fact also adjacent, then line by line drive singal is applied to the scanning lead-in wire that the multi-strip scanning line of this active array display connects, and the brightness of the row pixel making in each group M article of sweep trace corresponding matches (being generally brightness identical), that is: in fact adjacent (M-1) × S+1 article, ..., M × S article brightness matches, in other words, make display even to the row pixel display effect that the sweep trace of bottom is corresponding from top, even if the row pixel region that the sweep trace of adjacent S bar or S bar multiple is corresponding and other row pixel region brightness variant, but because in a region, brightness matches, ensure that on the whole and cross bright without certain row pixel or cross dark phenomenon, in addition, this programme is that the scanning lead-in wire by connecting sweep trace applies different drive singal, low relative to cost raising processing technology of the prior art,
Further, research shows, the leaping voltage (kick-backvoltage) of pixel electrode is closely related with the quality of picture, this programme matches (being generally brightness identical) in order to the brightness of the row pixel making in each group M article of sweep trace corresponding, and the leaping voltage of the row pixel adopting in controlling each group M article of sweep trace corresponding matches (being generally identical);
Further, match method that (being generally identical) adopt of the leaping voltage of the row pixel making in each group M article of sweep trace corresponding is the pulse waveform of the drive singal regulating the scanning lead-in wire connected M article of sweep trace in each group to apply, the resistance technique that the adjustment of this pulse waveform goes between relative to gated sweep, do not need to spend large hardware cost, and can reconcile in various degree its display effect is mated according to the resistance sizes situation of the scanning lead-in wire produced, thus good with existing active array display compatibility;
Further, the method for the pulse waveform of described adjustment drive singal comprises one of them or its combination of following A, B, C method:
A, use stepped pulse waveform;
B, regulate the pulse height of described pulse waveform;
C, the rise time changing described pulse waveform and/or fall time; It is simple that these three kinds of methods realize hardware, and pulse waveform stable output;
Further, in A method, described stepped pulse waveform comprises the first high level and the second high level, described first high level is greater than described second high level, by increasing the duration of described second high level and/or reducing the described leaping voltage of size realization reduction of described second high level, by reducing the duration of described second high level and/or increasing the described leaping voltage of size realization increase of described second high level;
Further, in B method, described pulse waveform is the waveform formed by single high level, realizes reducing described leaping voltage by the size reducing described single high level, realizes increasing described leaping voltage by the size increasing described single high level;
Further, described S is even number, and its scan drive circuit of display due to reality is generally positioned at the non-display area of display bottom, this driving circuit is applied on sweep trace by scanning lead-in wire, thus, the 1st article of sweep trace on display often in group is: the 1st article ..., S article, S bar altogether, display, can draw one from the left side from top to bottom, the right draws one, the like; Have more ubiquity ground, M article of sweep trace often in group: (M-1) × S+1 article ..., M × S article, altogether S bar, corresponding scanning lead-in wire, from top to bottom, can draw one from the left side, the right draws one to display, the like;
Further, for M article in each group, that is: (M-1) × S+1 article, ..., M × S article, the sweep trace that altogether S bar is actual adjacent, because the resistance of scanning lead-in wire corresponding to every bar sweep trace is different, for making the row pixel intensity of its correspondence match (being generally brightness identical), the pulse waveform thus added by every bar scanning lead-in wire is different.
Further, in fact and non-conterminous in same group, each bar sweep trace is due to, thus corresponding row pixel is without the need to identical, for improving the utilization factor (or saving drive singal generation device) of drive singal, the pulse waveform of the drive singal that this scanning lead-in wire connected with the sweep trace in group is corresponding is identical.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of driving method provided by the invention;
Fig. 2 is the driving method grouping schematic diagram that the present embodiment one provides;
Fig. 3 to Fig. 5 is the schematic diagram of the first control method in the present embodiment one;
Fig. 6 to Fig. 7 is the schematic diagram of the second control method in the present embodiment one;
Fig. 8 is the schematic diagram of the third control method in the present embodiment one;
Fig. 9 is the structural representation of the driving circuit that embodiment one provides;
Figure 10 is the structural representation of the shift register in Fig. 9;
Figure 11 is the structural representation of the pulse waveform generation module that first group in Fig. 9 is corresponding;
Figure 12 be display from top to bottom every bar sweep trace successively by the sequential chart scanned;
Figure 13 is the structural representation of the driving circuit that embodiment two provides.
Embodiment
As described in the background art, due to the restriction of technique and material, the resistance exact matching that the scanning of each bar sweep trace is gone between is very difficult, and horizontal band is difficult to eliminate well.For the problems referred to above, process flow diagram as shown in Figure 1, the present invention proposes first to perform step S11, the multi-strip scanning line of active array display is divided into S group, and every bar sweep trace connects a scanning lead-in wire, S-1 bar sweep trace of being often separated by between adjacent scanning lines in group, S >=2, S is integer; The top of such as display is the 1st article of sweep trace, is followed successively by the 2nd article in downward direction along display ..., S article, S+1 article ..., 2S article, 2S+1 article ..., 3S article ....Wherein, the 1st article, S+1 article, 2S+1 article ... be first group; Article 2, S+2 article, 2S+2 article ... be second group; ...; S article, 2S article, 3S article ... be S group; ....The 1st article of sweep trace on display in each group is: the 1st article, the 2nd article ..., S article; M article of sweep trace in each group is: (M-1) × S+1 article, (M-1) × S+2 article ..., (M-1) × S+S article ...; M is positive integer.Then step S12 is performed, line by line drive singal is applied to the scanning lead-in wire that the multi-strip scanning line of this active array display connects, and to make in each group M article of sweep trace (i.e. (M-1) × S+1 article, (M-1) × S+2 article ..., (M-1) × S+S article, for the S bar sweep trace that reality is adjacent) corresponding row pixel intensity matches (being generally brightness identical), M=1,2,3 ....In other words, make display even to the row pixel display effect that the sweep trace of bottom is corresponding from top.
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.Principle of the present invention is described, so do not draw to scale owing to focusing on.
Embodiment one
The present embodiment one, for the purpose of interest of clarity, is formed viewing area for 8 row pixels.
With reference to shown in Fig. 1, introduce the scanning line driving method of the liquid crystal display that the present embodiment one provides below in detail.
First perform S11,8 of described liquid crystal display sweep traces are divided into 4 groups, every bar sweep trace connects a scanning lead-in wire, 3 sweep traces of being often separated by between adjacent scanning lines in group.Herein adjacent, does not refer to that the reality of sweep trace is adjacent, but often in group sweep trace arrive adjacent greatly from large to small or from childhood by its PS label.
With reference to shown in Fig. 2, this liquid crystal display comprises the viewing area 2 in dotted line frame and the non-display area outside dotted line frame, 8 sweep trace 201-208 have been horizontally disposed with in viewing area 20, vertically be provided with a plurality of data lines, every bar data line and sweep trace 201-208 intersection region form a pixel region, and have a TFT21 in each pixel region, the grid of this TFT21 is connected with sweep trace, source electrode is connected with data line, and drain electrode is connected with pixel electrode.Often row pixel forms a row pixel.In addition, opening of TFT21 is controlled by the drive singal on grid with closing, every bar sweep trace 201-208 is connected with respective scanning lead-in wire G1-G8, this drive singal is applied directly on scanning lead-in wire G1-G8, and Signal transmissions to go between the after-applied grid at TFT of G1-G8, sweep trace 201-208 through overscanning.
After this step executes, as shown in Figure 2,8 sweep trace 201-208 have been divided into 4 groups, the first group: 1st article of sweep trace 201 and the 5th article of sweep trace 205, and in first group the 1st article of sweep trace 201 and be separated by 3 article sweep traces adjacent with the 5th article of sweep trace 205; Article second group: 2, sweep trace 202 and the 6th article of sweep trace 206, and in second group the 2nd article of sweep trace 202 and be separated by 3 article sweep traces adjacent with the 6th article of sweep trace 206; Article the 3rd group: 3, sweep trace 203 and the 7th article of sweep trace 207, and in the 3rd group the 3rd article of sweep trace 203 and be separated by 3 article sweep traces adjacent with the 7th article of sweep trace 207; Article the 4th group: 4, sweep trace 204 and the 8th article of sweep trace 208, and in the 4th group the 4th article of sweep trace 204 and be separated by 3 article sweep traces adjacent with the 8th article of sweep trace 208.These 8 sweep trace 201-208 are connected respectively 8 row pixels.These 8 row pixels are respectively the 1st article from display from top to bottom, the 2nd article ..., the 8th article, accordingly, these 8 articles of sweep trace 201-208 are respectively the 1st article of the 201,2nd article of 202... from display from top to bottom, the 8th article 208.
Then perform S12, line by line drive singal is applied to the scanning lead-in wire G1-G8 that 8 sweep trace 201-208 of described liquid crystal display connect, and the brightness of the row pixel making in each group M article of sweep trace corresponding matches, 1≤M≤2.M is herein 1 or 2.Such as, line by line drive singal is applied to the scanning lead-in wire G1-G8 that 8 sweep trace 201-208 of described liquid crystal display connect, and the brightness of the row pixel making the 1st article of sweep trace 201 (the 1st article of first group), the 2nd article of sweep trace 202 (the 1st article of second group), the 3rd article of sweep trace 203 (the 1st article of the 3rd group), the 4th article of sweep trace 204 (the 1st article of the 4th group) corresponding matches (being generally identical).
Be different from the resistance (resistance usually making the scanning of each sweep trace go between is identical) mating the scanning lead-in wire of each sweep trace by improving processing technology mentioned in background technology, this step is that the scanning lead-in wire by connecting sweep trace applies different drive singal, and the row pixel intensity realizing many reality adjacent matches (being generally identical).In addition, this drive singal can also regulate according to the scanning lead resistance size of different sweep traces, namely after liquid crystal display hardware prepares, the drive singal being applied to each horizontal scanning line can be correspondingly adjusted, applying flexible and applied range for the difference of the scanning lead resistance of sweep trace.
Research shows, the leaping voltage (kick-backvoltage) applying voltage is on the pixel electrode closely related with display effect (as horizontal band), thus the pulse waveform of the drive singal being applied to the scanning lead-in wire that each horizontal scanning line connects is regulated in this step, the leaping voltage of corresponding each row pixel is matched (being generally identical), and then the row pixel intensity realizing many reality adjacent match (being generally identical).
In the present embodiment one, article 8, sweep trace 201-208 is divided into four groups, often organize two sweep traces, often the interior 1st article of sweep trace of group is in fact adjacent (is respectively the 1st article 201, the 2nd articles 202, article 3,203 and the 4th article 204), often the 2nd article of sweep trace in fact adjacent (being respectively the 5th article 205, the 6th articles the 206,7th article 207 and the 8th articles 208) in group.In order to make the 1st article of sweep trace 201-204 in actual adjacent often group, often the brightness of the row pixel that the interior 2nd article of sweep trace 205-208 of group is corresponding matches (being generally identical) respectively, adjustment is applied to the pulse waveform of the drive singal of the scanning lead-in wire that this 1st article of sweep trace often in group connects, corresponding each row pixel is made (to be respectively the 1st row, 2nd row, 3rd row and the 4th row) leaping voltage match (being generally identical), the pulse waveform of the drive singal of the scanning lead-in wire that the 2nd article of sweep trace often in group connects, corresponding each row pixel is made (to be respectively the 5th row, 6th row, 7th row and eighth row) leaping voltage match (being generally identical).
In specific implementation process, this leaping voltage matches and has multiple implementation method.The present embodiment one is realized by the pulse waveform of regulation voltage, and the present embodiment one provides the control method of three kinds of pulse waveforms.
The first: use stepped pulse waveform.
This stepped pulse waveform comprises the first high level VGH1 and the second high level VGH2, and the first high level VGH1 is greater than described second high level VGH2.As shown in Figure 3,1st article of sweep trace (namely downward from display top the 1st article 201 in each group, article 2,202, article 3,203, article 4, scanning lead-in wire G1-G4 resistance sizes 204) is different, identical scan line driving signal is just different respectively through distortion level after the different sweep trace lead-in wire G1-G4 of these resistance sizes, and the leaping voltage of corresponding each row pixel (being respectively the 1st row, the 2nd row, the 3rd row and the 4th row) does not match.The scanning lead-in wire that resistance is large causes the leaping voltage of corresponding line pixel little, and the scanning lead-in wire that resistance is little causes the leaping voltage of corresponding line pixel large.In Fig. 3, the scanning lead-in wire G1-G4 resistance of the 1st article of sweep trace the 201,2nd article of sweep trace the 202,3rd article of sweep trace the 203,4th article of sweep trace 204 reduces successively, and the leaping voltage of corresponding line pixel increases successively.Match to make the leaping voltage of each row pixel, can adopt with the following method: the stepped pulse waveform of scanning lead-in wire input that (1) is large to resistance, increase the size of the second high level VGH2, to increase the leaping voltage of row pixel corresponding to this scanning lead-in wire; The scanning lead-in wire input stepped pulse waveform little to resistance, reduces the size of the second high level VGH2, to reduce the leaping voltage (as shown in Figure 4) of row pixel corresponding to this scanning lead-in wire.(2) large to the resistance stepped pulse waveform of scanning lead-in wire input, increases the duration of its second high level VGH2, to increase the leaping voltage of row pixel corresponding to this scanning lead-in wire; The scanning lead-in wire input stepped pulse waveform little to resistance, reduces the duration of its second high level VGH2, to reduce the leaping voltage (as shown in Figure 5) of row pixel corresponding to this scanning lead-in wire.Employing method (1) (2) make the leaping voltage of row pixel corresponding to these 4 sweep trace 201-204 match (being generally identical).(1) (2) two kinds of methods should can select a use, also can use simultaneously.Identical with article sweep trace 201-204 control method of the 1st in each group to article sweep trace 205-208 control method of the 2nd in each group.
The second: the pulse height of pulse waveform regulated.
This pulse waveform is made up of single high level.As shown in Figure 6,1st article of sweep trace 201-204 (namely downward from display top the 1st article 201 in each group, article 2,202, article 3,203, article 4, scanning lead-in wire G1-G4 resistance sizes 204) is different, identical scan line driving signal is just different respectively through distortion level after the different sweep trace lead-in wire G1-G4 of these resistance sizes, and the leaping voltage of corresponding each row pixel (being respectively the 1st row, the 2nd row, the 3rd row and the 4th row) does not match.The scanning lead-in wire that resistance is large causes the leaping voltage of corresponding line pixel little, and the scanning lead-in wire that resistance is little causes the leaping voltage of corresponding line pixel large.In Fig. 6, the scanning lead-in wire G1-G4 resistance of the 1st article of sweep trace the 201,2nd article of sweep trace the 202,3rd article of sweep trace the 203,4th article of sweep trace 204 reduces successively, and the leaping voltage of corresponding line pixel increases successively.Match to make the leaping voltage of each row pixel, can adopt with the following method: scanning lead-in wire input pulse waveform (be generally square wave) large to resistance, increase the size (pulse height) of single high level, to increase the leaping voltage of row pixel corresponding to this scanning lead-in wire; The scanning lead-in wire input pulse waveform little to resistance, reduces the size (pulse height) of single high level, to reduce the leaping voltage (as shown in Figure 7) of row pixel corresponding to this scanning lead-in wire.The method is adopted to make the leaping voltage of row pixel corresponding to these 4 sweep traces match (being generally identical).Identical with the 1st article of sweep trace 201-204 control method in every group to the 2nd article of sweep trace 205-208 control method in every group.
It should be noted that, the duration that second method can be considered as the second high level VGH2 in first method is the limiting case of 0.
The third: the rise time and/or the fall time that change pulse waveform.Rise time in this method and/or fall time change the moment of waveform rising edge and/or the moment of negative edge.
This pulse waveform is also made up of single high level, but the place different from second method is, this method is the moment by the moment and/or negative edge changing this pulse waveform rising edge, and the leaping voltage realizing M article of sweep trace in each group matches (being generally identical).In Fig. 8, the scanning lead-in wire G1-G4 resistance of the 1st article of sweep trace the 201,2nd article of sweep trace the 202,3rd article of sweep trace the 203,4th article of sweep trace 204 reduces successively, and the leaping voltage of corresponding line pixel increases successively.Match to make the leaping voltage of each row pixel, can adopt with the following method: scanning lead-in wire input pulse waveform (be generally square wave) large to resistance, extend the negative edge moment of single high level, to increase the leaping voltage of row pixel corresponding to this scanning lead-in wire; The scanning lead-in wire input pulse waveform little to resistance, shortens the negative edge moment of single high level, to reduce the leaping voltage (as shown in Figure 8) of row pixel corresponding to this scanning lead-in wire.
It is simple that these three kinds of methods realize hardware, and pulse waveform stable output.
To sum up, because the scanning lead-in wire G1-G8 resistance of every bar sweep trace 201-208 is different, for making in each group the 1st article of sweep trace 201-204 (namely downward from display top the 1st article 201, article 2,202, article 3,203, article 4,204) corresponding row pixel intensity matches (being generally brightness identical), thus the pulse waveform of every bar scanning lead-in wire added by G1-G4 is different, 2nd article of sweep trace 205-208 (namely downward from display top the 5th article 205 in each group, article 6,206, article 7,207, article 8,208) corresponding row pixel intensity matches (being generally brightness identical), the pulse waveform of every bar scanning lead-in wire added by G5-G8 is also different.But, each bar sweep trace in same group, article 1,201 and the 5th article 205, article 2,202 and the 6th article 206, article 3,203 and the 7th article 207, article 4,204 and the 8th article 208, in fact and non-conterminous due to, thus corresponding row pixel is without the need to identical, for improving the utilization factor (or saving driving signal generator) of drive singal, the pulse waveform of the drive singal that this scanning lead-in wire connected with the sweep trace in group is corresponding can be identical, and in other words, the scanning lead-in wire connected with each sweep trace in group shares a driving signal generator.
In other embodiment, if all sweep traces are divided into S group, for M article in each group, that is: (M-1) × S+1 article, (M-1) × S+2 article ..., (M-1) × S+S article, the sweep trace that S bar is actual adjacent altogether, for making the row pixel intensity of its correspondence match (being generally identical), the pulse waveform added by the scanning that thus every bar sweep trace connects goes between is different.In fact and non-conterminous in same group, each bar sweep trace is due to, thus corresponding row pixel is without the need to identical, for improving the utilization factor (or saving driving signal generator) of drive singal, the pulse waveform of the drive singal that this scanning lead-in wire connected with the sweep trace in group is corresponding is identical.
In the present embodiment one, all 8 sweep trace 201-208 are divided into 4 groups, and this group number is even number.The advantage of even number set number is adopted to be: as shown in Figure 2, actual its scan drive circuit of display is generally positioned at the non-display area of display bottom, this driving circuit applies drive singal by scanning lead-in wire to main scanning line, thus, the 1st article of sweep trace 201-204 (namely downward from display top the 1st article 201 on display often in group, article 2,202, article 3,203, article 4,204) corresponding scanning lead-in wire G1-G4, display from top to bottom, can meet and draw one from the left side, and the right draws one, the like, conveniently go between layout.
In other embodiment, if institute's packet count is S group, then M article of sweep trace often in group: (M-1) × S+1 article, (M-1) × S+2 article ..., (M-1) × S+S article ...; M is positive integer, altogether S bar, corresponding scanning lead-in wire, and from top to bottom, can draw one from the left side, the right draws one to display, the like, conveniently go between layout.
Corresponding with above-mentioned driving method, the present embodiment one also provides a kind of scan line drive circuit of liquid crystal display.
Still continue to use the aforementioned liquid crystal display (as shown in Figure 2) with 8 sweep trace 201-208, these 8 sweep traces are divided into 4 groups, 3 sweep traces of being often separated by between adjacent scanning lines in group.
As shown in Figure 9, this scan line drive circuit 1 comprises:
4 pulse waveform generation modules 11,12,13,14, the scanning lead-in wire corresponding respectively to described 4 groups of sweep traces provides pulse waveform;
Shift register 15, for controlling the scanning lead-in wire G1-G8 line by line output pulse waveform of described 4 pulse waveform generation modules 11,12,13,14 to 8 sweep trace 201-208 connections of liquid crystal display.
In the present embodiment one, respectively with the 1st article of sweep trace 201, article 5, the scanning lead-in wire G1 of sweep trace 205 connection, G5 shares a pulse waveform generation module 11, respectively with the 2nd article of sweep trace 202, article 6, the scanning lead-in wire G2 of sweep trace 206 connection, G6 shares a pulse waveform generation module 12, respectively with the 3rd article of sweep trace 203, article 7, the scanning lead-in wire G3 of sweep trace 207 connection, G7 shares a pulse waveform generation module 13, respectively with the 4th article of sweep trace 204, article 8, the scanning lead-in wire G4 of sweep trace 208 connection, G8 shares a pulse waveform generation module 14.This pulse waveform generation module 11,12,13,14 constantly produces pulse waveform after starting, but whether this pulse waveform is applied on the scanning lead-in wire of corresponding sweep trace connection, needs the control relying on shift register 15.As shown in Figure 10, shift register 15 has multiple output terminal, is often shifted once, and corresponding output terminal is opened, and now the output terminal output level width of this correspondence is the pulse waveform of H, and the pulse waveform of the scanning lead-in wire G1-G8 that this output terminal is corresponding could export.So, shift register 15 is constantly shifted, and display applies pulse waveform to the scanning lead-in wire G1-G8 that each bar sweep trace 201-208 connects from top to bottom.It should be noted that, in other embodiments, the output terminal number of this bit register 15 can be greater than the number of sweep trace, leaves output port for subsequent use, with the multiple situation of compatibility.
Below introduce the composition of pulse waveform generation module 11,12,13,14.With reference to shown in Figure 11, for the pulse waveform generation module 11 of first group of sweep trace 201,205 correspondence, this pulse waveform generation module 11 comprises:
Timer 111, its time-count cycle is H;
Register 112, for parameter storage time;
Comparer 113, by timer 111 clock between and register 112 deposit time parameter and make comparisons, export comparative result;
First multiplexer 114 (multiplexer), there are two input ends connecting the first high level VGH1 and the second high level VGH2 respectively, and the control end to be connected with the output terminal of comparer 113, the comparative result that the first multiplexer 114 exports according to comparer 113 is repeat the pulse waveform that output first high level and the second high level formed the cycle with H;
Multiple second multiplexer 115 (in figure is 2, corresponding scanning lead-in wire G1 and G5 respectively), each second multiplexer 115 has another input end of the output terminal connecting low level VGL input end and described first multiplexer 114 respectively, and the control end to be connected with the corresponding output end of shift register 15, scanning lead-in wire G1, G5 output packet that multiple second multiplexer 115 connects to corresponding sweep trace 201,205 under the control of shift register 15 is containing the pulse waveform of the first high level VGH1 and the second high level VGH2.
The present embodiment one, the first high level VGH1 input end of the first multiplexer 114 (multiplexer) is connected with the first high level VGH1 generation unit 13, second high level VGH2 generation unit 14 respectively with the second high level VGH2 input end.The low level VGL input end of the second multiplexer 115 is connected with low level VGL generation unit 16.
In the present embodiment one, this second multiplexer 115 is equal with the number of the sweep trace in every group, and namely every bar sweep trace connects second multiplexer 115.In other embodiment, for making this driving circuit 1 can compatible multiple service condition, can stay several sweep trace connector for subsequent use, the number of the second multiplexer 115 namely often in group is more than the number of the sweep trace in every group more.
In each cycle H, timer 111 constantly compares with the time parameter stored in register 112, such as, when being greater than the time parameter of storage between timer 11 timing, comparative result is expressed as " 1 ", and pass to the control end of the first multiplexer 114, the output terminal controlling this first multiplexer 114 exports the first high level VGH1, if when being not more than the time parameter of storage between timer 11 timing, comparative result is expressed as " 0 ", and pass to the control end of the first multiplexer 114, the output terminal controlling this first multiplexer 114 exports the second high level VGH2.Can certainly set when being greater than the time parameter of storage between timer 11 timing as required, " 0 " is passed to the control end of the first multiplexer 114, the output terminal controlling this first multiplexer 114 exports the second high level VGH2; When being not more than, " 1 " is passed to the control end of the first multiplexer 114, the output terminal controlling this first multiplexer 114 exports the first high level VGH1; Or setting " 0 " represents the time corresponding output the first high level VGH1 that are greater than storage between timer 11 timing, setting " 1 " represents the time corresponding output the second high level VGH2 that are not more than storage between timer 11 timing.
In the present embodiment one, the time-count cycle of this timer 111 is H, and automatic clear when namely timing reaches H, starts next cycle timing.In addition, this time-count cycle is also identical with the cycle that shift register 15 is often shifted once, and in other words, after this shift register 15 controls the complete output of pulse waveform of a sweep trace in one-period H, timer 111 resets.
For the first stepped pulse waveform control method of foregoing description, the time parameter stored in register 112 is between 0 and H, thus, in one-period, first multiplexer 114 exports the pulse waveform that the first high level VGH1 and the second high level VGH2 is formed, along with timer 111 constantly timing, comparer 113 constantly compares value and the interior time parameter stored of register 112 of this timer, first multiplexer 114 is continuous is the first high level VGH1 of H and the pulse waveform of the second high level VGH2 formation according to " 0 " or " 1 " output cycle of comparer 113.
For the method for the pulse height of the second pulse waveform regulated of foregoing description, the time parameter stored in register 112 is less than 0 or be greater than H, thus in one-period, first multiplexer 114 exports the Sing plus waveform that the first high level VGH1 or the second high level VGH2 is formed, along with timer 111 constantly timing, comparer 113 constantly compares value and the interior time parameter stored of register 112 of this timer, and the first multiplexer 114 is constantly the Sing plus waveform of H according to comparative result (" 0 " or " 1 ") the output cycle of comparer 113.
For the first control method, the sequential chart of the scanning of each bar sweep trace 201-208 from top to bottom of display shown in Figure 12, the drive singal of the first multiplexer that every bar sweep trace 201-208 is corresponding exports continuously, along with in shift register 15 constantly shifting process, the pulse waveform of the scanning lead-in wire G1-G8 that the sweep trace 201-208 that the output terminal chosen is corresponding connects just is output.
Wherein, for stepped pulse waveform control method, according to the situation of different scanning line, the duration of the first high level VGH1, the second high level VGH2 needs to regulate respectively, and thus, the time parameter stored in register 112 needs adjustable.In addition, the second high level VGH2 size needs to regulate, and thus, the high level that the second high level VGH2 generation unit 14 produces needs to regulate.
For the method for the pulse height of pulse waveform regulated, according to the situation of different scanning line, the size of the first high level VGH1 or the second high level VGH2 needs to regulate, thus, the high level of the first high level VGH1 generation unit 13 generation or the high level of the second high level VGH2 generation unit 14 generation need to regulate.
The pulse waveform generation module 11 being first group of sweep trace and being connected described above, the pulse waveform generation module 12,13,14 that other group sweep trace is connected is roughly the same with the pulse waveform generation module 11 that first group is retouched line connected.Between different group, first high level VGH1, the second high level VGH2, low level VGL can be identical, in such cases, all first multiplexers can share described first high level VGH1 generation unit 13 and described second high level VGH2 generation unit 14, and all second multiplexers can share described low level generation unit 16.The first high level VGH1 between different group, the second high level VGH2, low level VGL, not under same case, connect the first respective high level separately and produce VGH1 unit 13, second high level VGH2 generation unit 14, low level VGL generation unit 16.
In addition, the resistance situation that the scanning connected according to the sweep trace of each group between different groups goes between, the numerical value deposited in register 112 can be different.
Driving circuit 1 and the liquid crystal display of foregoing description are respectively independently element.
For liquid crystal display in above embodiment one, driving circuit in the present embodiment one and driving method can be used in all active array displays, as scan line drive circuit and the driving method of active array display, this active array display can also be such as organic light emitting display.
Based on this, the present embodiment one also provides a kind of active array display in addition, comprises the scan line drive circuit of the active array display of foregoing description.In other words, this driving circuit is an element in liquid crystal display.
Particularly, this active array display also comprises pel array, and the multi-strip scanning line be connected with described pel array; Described in each, sweep trace is positioned at viewing area, and every one scan lead-in wire is positioned at non-display area.
Embodiment two
What describe in embodiment one is the divided evenly situation of the sweep trace 201-208 of display, and more at large, existing liquid crystal display 1024 × 768 pixel, horizontal scanning line is 1024, if be divided into 10 groups, then there will be and does not divide exactly situation.
For above-mentioned situation, still formed viewing area for 8 row pixels shown in Fig. 2, often corresponding 1 sweep trace of row pixel, and display is from top to bottom, is respectively the 1st article the 201,2nd article 202 ... the 8th article 208.
First perform S11 ', 8 of described liquid crystal display sweep trace 201-208 are divided into 3 groups, 2 sweep traces of being often separated by between adjacent scanning lines in group.Adjacent explanation of still continuing to use embodiment one herein.
After this step executes, as shown in figure 13,8 sweep trace 201-208 have been divided into 3 groups, the first group: 1st article 201, the 4th articles 204 and the 7th articles 207; Article second group: 2,202, the 5th articles 205 and the 8th articles 208; Article the 3rd group: 3,203 and the 6th articles 206.
Then S12 ' is performed, line by line drive singal is applied to the scanning lead-in wire G1-G8 that 8 sweep trace 201-208 of described liquid crystal display connect, and the brightness of the row pixel making in each group M article of sweep trace corresponding matches (being generally identical), 1≤M≤3.M is herein 1 or 2 or 3.
In the present embodiment two, the 1st article of sweep trace often in group: the 1st article 201, the 2nd articles 202 row pixels corresponding with the 3rd article 203 are in fact adjacent, the 2nd article of sweep trace often in group: the 4th article 204, the 5th articles 205 row pixels corresponding with the 6th article 206 are in fact adjacent, the 3rd article of sweep trace often in group: the row pixel of the 7th article of 207, the 8th articles of 208 correspondences is in fact adjacent.For making row pixel intensity corresponding to M article of sweep trace in often group adjacent in reality match (being generally identical) in the present embodiment two, the leaping voltage controlling to be applied to this M article of sweep trace often in group matches (being generally identical).This leaping voltage is identical to be realized by pulse waveform regulated, and pulse waveform regulative mode is identical with embodiment one.
To sum up, because the resistance of every bar scanning lead-in wire G1-G8 is different, for making the 1st article of sweep trace (the 1st article sweep trace 201 in each group, article 2, sweep trace 202, article 3, sweep trace 203) corresponding row pixel intensity matches (being generally identical), and thus the pulse waveform added by scanning lead-in wire that connects of every bar sweep trace is different; For making the 2nd article of sweep trace (the 4th article sweep trace 204 in each group, article 5, sweep trace 205, article 6, sweep trace 206) corresponding row pixel intensity matches (being generally identical), and the pulse waveform added by scanning lead-in wire that every bar sweep trace connects is also different; For making the row pixel intensity of the 3rd article of sweep trace (the 7th article sweep trace the 207,8th article of sweep trace 208) correspondence in each group match (being generally identical), the pulse waveform added by scanning lead-in wire that every bar sweep trace connects is also different.But, each bar sweep trace in same group, article 1, sweep trace 201, article 4, sweep trace 204 and the 7th article of sweep trace 207, article 2, sweep trace 202, article 5, sweep trace 205 and the 8th article of sweep trace 208, article 3, sweep trace 203 and the 6th article of sweep trace 206, in fact and non-conterminous due to, thus corresponding row pixel is without the need to identical, for improving the utilization factor (or saving driving signal generator) of drive singal, the pulse waveform of the drive singal that this scanning lead-in wire connected with the sweep trace in group is corresponding can be identical, in other words, the scanning lead-in wire connected with each sweep trace in group shares a drive singal.
In other embodiment, if be divided into S group, for M article in each group, that is: (M-1) × S+1 article, (M-1) × S+2 article ..., altogether S bar or be less than the adjacent sweep trace of the reality of S bar, for making the row pixel intensity of its correspondence match (being generally identical), the pulse waveform added by the scanning that thus every bar sweep trace connects goes between is different.In fact and non-conterminous in same group, each bar sweep trace is due to, thus corresponding row pixel is without the need to identical, for improving the utilization factor (or saving driving signal generator) of drive singal, the pulse waveform of the drive singal that this scanning lead-in wire connected with the sweep trace in group is corresponding is identical.
For the non-situation about dividing exactly described in the present embodiment two, similar in its scan line drive circuit and embodiment one.
As shown in figure 13, this scan line drive circuit 2 comprises:
3 pulse waveform generation modules 31,32,33, the scanning lead-in wire connected respectively to described 3 groups of sweep traces provides pulse waveform;
Shift register 15, for controlling the scanning lead-in wire G1-G8 line by line output pulse waveform of described 3 pulse waveform generation modules 31,32,33 to 8 sweep trace 201-208 connections of liquid crystal display.
In the present embodiment two, go between with the 1st article of sweep trace 201, the 4th article of sweep trace 204, the 7th article of scanning that sweep trace 207 is connected G1, G4, G7 shared pulse waveform generation module 31 respectively, go between with the 2nd article of sweep trace 202, the 5th article of sweep trace 205, the 8th article of scanning that sweep trace 208 is connected G2, G5, G8 shared pulse waveform generation module 32 respectively, and go between with the 3rd article of sweep trace 203, the 6th article of scanning that sweep trace 206 is connected G3, G6 shared pulse waveform generation module 33 respectively.Identical with embodiment one, this pulse waveform generation module 31,32,33 constantly produces pulse waveform after starting, but whether this pulse waveform is applied on the scanning lead-in wire of corresponding sweep trace connection, needs the control relying on shift register 15.The structure and fuction of this shift register 15, the structure and fuction of each pulse waveform generation module 31,32,33 are all identical with embodiment one.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to the present invention.Any those of ordinary skill in the art, are not departing under technical solution of the present invention ambit, the technology contents of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solution of the present invention, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belongs in the scope of technical solution of the present invention protection.
Claims (22)
1. a scanning line driving method for active array display, is characterized in that, comprising:
The multi-strip scanning line of described active array display is divided into S group, and every bar sweep trace connects a scanning lead-in wire, S-1 bar sweep trace of being often separated by between adjacent scanning lines in group, S >=2, and S is integer;
The scanning lead-in wire connected the multi-strip scanning line of described active array display applies drive singal line by line, and the brightness of the row pixel making in each group M article of sweep trace corresponding matches, and M is positive integer.
2. the scanning line driving method of active array display according to claim 1, it is characterized in that, the match method that adopts of the brightness of the row pixel making in each group M article of sweep trace corresponding is that leaping voltage by controlling in each group row pixel corresponding to M article of sweep trace matches and realizes.
3. the scanning line driving method of active array display according to claim 2, it is characterized in that, the match method that adopts of the leaping voltage of the row pixel making in each group M article of sweep trace corresponding is the pulse waveform of the drive singal regulating the scanning lead-in wire connected M article of sweep trace in each group to apply.
4. the scanning line driving method of active array display according to claim 3, is characterized in that, the method for the pulse waveform of described adjustment drive singal comprises one of them or its combination of following A, B, C method:
A, use stepped pulse waveform;
B, regulate the pulse height of described pulse waveform;
C, the rise time changing described pulse waveform and/or fall time.
5. the scanning line driving method of active array display according to claim 4, is characterized in that, described stepped pulse waveform comprises the first high level and the second high level, and described first high level is greater than described second high level.
6. the scanning line driving method of active array display according to claim 5, it is characterized in that, during the stepped pulse waveform of described use, by increasing the duration of described second high level and/or reducing the described leaping voltage of size realization reduction of described second high level, by reducing the duration of described second high level and/or increasing the described leaping voltage of size realization increase of described second high level.
7. the scanning line driving method of active array display according to claim 4, is characterized in that, described pulse waveform is the waveform formed by single high level.
8. the scanning line driving method of active array display according to claim 7, it is characterized in that, during the pulse waveform that described use is formed by single high level, realize reducing described leaping voltage by the size reducing described single high level, realize increasing described leaping voltage by the size increasing described single high level.
9. the scanning line driving method of active array display according to claim 1, is characterized in that, the number of described sweep trace divides exactly divided group number S.
10. the scanning line driving method of active array display according to claim 1, is characterized in that, described S is even number.
The scanning line driving method of 11. active array displays according to claim 3, is characterized in that, the pulse waveform of the drive singal of the scanning lead-in wire correspondence of M article of sweep trace connection in each group is different.
The scanning line driving method of 12. active array displays according to claim 11, is characterized in that, the pulse waveform of the drive singal that the scanning lead-in wire that in same group, each bar sweep trace connects is corresponding is identical.
The scan line drive circuit of 13. 1 kinds of active array displays, is characterized in that,
Described active array display comprises multi-strip scanning line, and every bar sweep trace connects a scanning lead-in wire, and described multi-strip scanning line is divided into S group, S-1 bar sweep trace of being often separated by between adjacent scanning lines in group, S >=2, and S is integer;
Described scan line drive circuit comprises:
S pulse waveform generation module, the scanning lead-in wire connected respectively to described S group sweep trace provides pulse waveform;
Shift register, the scanning lead-in wire connected to the multi-strip scanning line of described active array display for controlling described S pulse waveform generation module exports described pulse waveform line by line, and the brightness of the row pixel making in each group M article of sweep trace corresponding matches, M is positive integer.
The scan line drive circuit of 14. active array displays according to claim 13, it is characterized in that, described in each, pulse waveform generation module comprises:
Timer, its time-count cycle is H;
Register, for parameter storage time;
Comparer, makes comparisons with described time parameter between being clocked by described timer, exports comparative result;
First multiplexer, there are two input ends connecting the first high level and the second high level respectively, and the control end to be connected with described comparator output terminal, the comparative result that described first multiplexer exports according to described comparer is repeat the pulse waveform that output first high level and the second high level formed the cycle with H;
Multiple second multiplexer, second multiplexer described in each has two input ends connecting low level and described first multiplexer output terminal respectively, and the control end to be connected with the corresponding output end of described shift register, the scanning lead-in wire output packet that described multiple second multiplexer connects to corresponding sweep trace under the control of described shift register is containing the pulse waveform of the first high level and the second high level.
The scan line drive circuit of 15. active array displays according to claim 14, is characterized in that, in described pulse waveform generation module, the number of the second multiplexer equals the number of scanning lines in the scanline groups that is attached thereto.
The scan line drive circuit of 16. active array displays according to claim 14, it is characterized in that, it is by making the corresponding output terminal of described shift register export opening signal that described shift register controls described multiple second multiplexer to the described pulse waveform of scanning lead-in wire output that corresponding sweep trace connects, the control end of described second multiplexer is under the control of described opening signal, and output terminal exports described pulse waveform.
The scan line drive circuit of 17. active array displays according to claim 14, it is characterized in that, described scan line drive circuit also comprises the first high level generation unit, the second high level generation unit and low level generation unit, all first multiplexers share described first high level generation unit and described second high level generation unit, and all second multiplexers share described low level generation unit.
The scan line drive circuit of 18. active array displays according to claim 17, is characterized in that, the voltage that described first high level generation unit, the second high level generation unit produce is adjustable respectively.
The scan line drive circuit of 19. active array displays according to claim 14, is characterized in that, the time parameter of described register memory storage is adjustable.
20. 1 kinds of active array displays, is characterized in that, comprise the scan line drive circuit of the active array display in claim 13-19 described in any one.
21. active array displays according to claim 20, is characterized in that, described active array display also comprises pel array, and the multi-strip scanning line be connected with described pel array; Described in each, sweep trace is positioned at viewing area, and every one scan lead-in wire is positioned at non-display area.
22. active array displays according to claim 21, is characterized in that, described active array display is liquid crystal display or organic light emitting display.
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| CN108492784B (en) * | 2018-03-29 | 2019-12-24 | 深圳市华星光电半导体显示技术有限公司 | Scanning drive circuit |
| CN114267303B (en) * | 2021-12-31 | 2022-08-09 | 北京显芯科技有限公司 | Method, device and equipment for adjusting brightness |
| CN114863871B (en) * | 2022-05-17 | 2024-02-27 | 昆山国显光电有限公司 | Display panel, driving method thereof and display device |
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