CN100392483C - Electro-optical-device driving circuit, electro-optical device, and electronic apparatus - Google Patents
Electro-optical-device driving circuit, electro-optical device, and electronic apparatus Download PDFInfo
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- CN100392483C CN100392483C CNB2005100852002A CN200510085200A CN100392483C CN 100392483 C CN100392483 C CN 100392483C CN B2005100852002 A CNB2005100852002 A CN B2005100852002A CN 200510085200 A CN200510085200 A CN 200510085200A CN 100392483 C CN100392483 C CN 100392483C
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Abstract
The invention provides an electric light device. The electric light device capable of reducing bad display caused by the dispersilbility of sampling circuit drive signals is provided with an enabling circuit consisting of a plurality of arrayed groups of m unit circuits. In each circuit of m unit circuits, the same transmission signal and different enabling signals are inputted, and the transmission signal is reshaped into a preset pulse width according to the enabling signals. The unit circuits in a same group have the same layout.
Description
Technical field
The present invention relates to electro-optical-device driving circuit, this electro-optical device that for example in electro-optical devices such as liquid-crystal apparatus, carries and possess this electro-optical device and the technical field of the electronic equipment that constitutes.
Background technology
For example on the substrate of electro-optical devices such as liquid-crystal apparatus, this driving circuit is made into as the data line drive circuit that is used for driving data lines or as the scan line drive circuit that is used for the driven sweep line etc.Constitute when its work, driving circuit is sampled with the pulse timing of sample circuit drive signal and is supplied to the picture signal of image signal line, supplies to data line.Here, if particularly driving frequency uprises, then because the top and the end of the sample circuit drive signal before and after on the time of using in sampling are overlapping slightly, therefore the picture signal that should sample in the different mutually time is partly overlapping, supplies on the data line.Resolution takes place and worsens or afterimage (ghost) in its result.
Therefore, in driving circuit in the past, import enable circuits.Enable circuits is to obtain the circuit of the logic product of each sample circuit drive signal and enable signal, and the pulse width of each sample circuit drive signal is narrowed to till the pulse width of enable signal.Usually the output of enable circuits is called the sample circuit drive signal, the original signal that is input to enable circuits is called transmission signals distinguish.If limit pulse width like this, then each other, produce the some time at interval as time margin in 2 sample circuit drive signals of front and back.Therefore, even be accompanied by high-frequency drive, baneful influences such as the electric capacity in the conducting resistance in the thin film transistor (TFT) active components such as (following be called aptly " TFT ") of the sample circuit of increase formation relatively, data line drive circuit etc. and the cloth line resistance of various wirings, element or the wiring, delay also can alleviate this baneful influence (for example with reference to patent documentation 1).
[patent documentation 1] spy opens the 2000-227784 communique
Yet, in this electro-optical device, have the speckle of the taeniae shape of generating period on picture, technical matterss such as display quality deterioration.As described later, under the observation of being undertaken by inventor of the present invention, distinguish that this taeniae shape speckle takes place, and thinks that thus the dispersiveness of sample circuit drive signal is its reason in every data line that drives simultaneously.
Summary of the invention
The present invention for example puts in view of the above-mentioned problems and finishes, purpose provides when driving many data lines at the same time, can reduce particularly what manifest with the group unit that is made of the data line that drives simultaneously is bad electro-optical-device driving circuit of the demonstration of cause and electro-optical device such as liquid-crystal apparatus for example with the dispersiveness in the sample circuit drive signal, and electronic equipment such as liquid crystal projector for example.
In order to address the above problem, electro-optical-device driving circuit of the present invention drives electro-optical device, this electro-optical device possesses many data lines and multi-strip scanning lines of mutual intersection extension and is electrically connected with above-mentioned data line and above-mentioned sweep trace respectively, be arranged in a plurality of pixel cells in the image display area, it is characterized in that: possess, from the shift register of order output transmission signals at different levels; With above-mentioned corresponding settings at different levels, have the input end of input said transmission signal and the said transmission signal that output is imported respectively, branch into many branch's wirings of the output terminal of m (wherein, m is the natural number more than or equal to 2); Supply is made of respectively the pulse of the preset width narrower than said transmission signal, and output regularly different enable supply line more than or equal to many of the enable signal of m series; Output is shaped as the pulse width according to above-mentioned enable signal the enable circuits of the reshaping signal of above-mentioned preset width; And according to above-mentioned reshaping signal sampling image signal, supply to the sample circuit of above-mentioned many data lines, above-mentioned enable circuits comprises a plurality of unit circuits, above-mentioned unit circuit is electrically connected an output terminal and the mutual different above-mentioned supply line that enables of series of the above-mentioned m of branching into respectively, in the group that is made of m above-mentioned unit circuit, each above-mentioned unit circuit has identical layout (layout) mutually.
According to electro-optical-device driving circuit of the present invention, then when it drives, by the clock signal of shift register, from the defeated transmission signals of orders at different levels according to predetermined period.Parallel mutually therewith, the enable signal of output predetermined pulse width that supply with or that generate in advance in this driving circuit inside from the outside.Then, by enable circuits, each transmission signals is by the narrower enable signal shaping of width, and the restriction pulse width is exported as reshaping signal.Here, " enable circuits " is defined as the circuit that shaping pulse is used, and shaping is by carrying out with (AND) inclusive NAND (NAND).If enable circuits constitutes with the AND circuit, then enable circuits output is directly inputted to sample circuit, if constitute with the NAND circuit, then needs impact damper (NOT, NOT-circuit) between enable circuits and sample circuit.Subsequently, reshaping signal or reshaping signal further the signal of the final output of processing be input in the sample circuit as sample circuit drive signal ripple.
Then, in sample circuit, according to the sample circuit drive signal, the picture signal that sampling is supplied with from the outside supplies to data line.Its result in the image display area of electro-optical device, according to the picture signal of supplying with from data line light modulated each pixel cell, carries out image and shows.
Here, branch into the wiring of m bar by output terminal, distribute to supply to m series (wherein, m is the natural number more than or equal to 2) from each of the transmission signals of the outputs at different levels of shift register.The transmission signals of these m series is input to respectively and different m unit circuits that enable in the enable circuits that supply line connects.That is, enable circuits is arranged of a plurality of input transmission signals, and the unit circuit of exporting a sample circuit drive signal according to this signal constitutes.In addition, enable signal is supplied with at least more than a plurality of series that equal m.
Though identical transmission signals of input in each of m unit circuit, because with different enable signal predetermined pulse width, therefore m sample circuit drive signals of the different output timings of output mutually.Like this, can by the different respectively output timing of regulation, carry out timesharing to a transmission signals, distribute to supply to many signal line, improve driving frequency the enable signal of a plurality of series as separate signal Processing.
In the electro-optical device that drives with this driving circuit, the speckle of the taeniae shape of generating period on picture sometimes.Inventor of the present invention, investigate for since the speckle of this taeniae shape show on the picture as the density of every the data line that drives simultaneously, therefore result from the dispersiveness of sample circuit drive signal of driving timing of control data line.Reason as dispersiveness, can enumerate a variety of causes such as stray capacitance in dispersiveness, enable circuits and the sample circuit between the enable signal series that causes by cloth line resistance that enables supply line etc., and inventor of the present invention is conceived to the layout of enable circuits therein.That is, this is because if destroy the unit circuit or the wiring symmetry at interval of a plurality of arrangements, and the film when then stray capacitance etc. is because of high-frequency drive rings, and will produce dispersiveness on signal voltage.
In the driving circuit, shift register generally adopts the high circuit structure of symmetry, the circuit part of the back level of the enable circuits that constitutes by sample circuit etc., it generally is aggregate with the corresponding circuit of each bar data line, even under current situation, also can remain the circuit layout symmetry of each bar data line to a certain degree.Relative therewith, general minute surface layout enable circuits symmetrically in each of the m that supplies with a identical traffic signal respectively unit circuit is organized.For example, mutually minute surface constitutes symmetrically and branches into 2 a pair of unit circuit of supplying with the identical traffic signal respectively.This is because each unit circuit for example is the many circuit of circuit elements number of packages such as NAND circuit, therefore the extremely general countermeasure of taking for shared wirings such as common source wiring narrow wire distribution distance.
Yet in this case, the interval between the unit circuit of shared wiring narrows down, and the interval between other unit circuit broadens.In addition, between each bar wiring or element of wiring in certain unit circuit or element and the unit circuit adjacent with its left and right sides, its mutual relative distance is according to layout and difference.The inhomogeneous viewpoint from high frequency noise at this interval, each all might become the reason of encouraging noise.
Therefore, in the present invention, same group of interior unit circuit has identical layout.Here, so-called layout " identical " refers to and does not comprise shared wiring, is the formation of separate layout, and the graphics shape of each conductive layer of forming circuit and position are identical mutually.Thus, in each group, each unit circuit rings for the film that adjacent unit circuit all applies equal extent.That is, therefore the sample circuit drive signal of exporting in same group can suppress mutual dispersiveness owing to generate mutual film sound identical unit circuit.In addition, in the present invention since like this with the mutual spacing of wiring in the enable circuits and element from as problem, both can be the layout on plane therefore as identical " layout ", also can be three-dimensional dimensional configurations.
Thereby, electro-optical-device driving circuit of the present invention is owing to make the unit circuit in the enable circuits have the group of identical traffic signal to have identical layout in each input, therefore the dispersiveness of the sample circuit drive signal exported can be suppressed, the demonstration speckle that shows bad particularly taeniae shape can be alleviated.
In a form of electro-optical-device driving circuit of the present invention, above-mentioned unit circuit equally spaced is arranged in above-mentioned group.
According to this form, then because the unit circuit in each group is mutual identical layout, on this basis, the distance between the adjacent cells circuit is identical, therefore make the film that is subjected to from adjacent unit circuit ring equalization, can further prevent the dispersiveness of film sound each other better.
In other form of electro-optical-device driving circuit of the present invention, above-mentioned unit circuit has mutually the same layout between a plurality of above-mentioned group.
According to this form, then since the layout of unit circuit not only in group but also also identical between group, therefore make the borderline unit circuit that is positioned between group from the suffered film sound of the adjacent unit circuit that the border is clipped in the middle be balanced to and on the same group other unit circuit from the equal degree of the suffered influence of adjacent unit circuit.
In other form of electro-optical-device driving circuit of the present invention, uniformly-spaced to arrange above-mentioned a plurality of groups.
According to this form, then since the interval between the unit circuit therefore not only in group but also also identical between group, make the borderline unit circuit that is positioned between group from the suffered film sound of the adjacent unit circuit that the border is clipped in the middle be balanced to and on the same group other unit circuit from the equal degree of the suffered influence of adjacent unit circuit.
In other form of electro-optical-device driving circuit of the present invention, the length of arrangement wire that branches into the part of above-mentioned m series in the wiring of above-mentioned branch equates respectively for an above-mentioned m unit circuit.In addition, in the wiring of the above-mentioned branch of each bar, the length from above-mentioned input end to above-mentioned each output terminal equates respectively.
According to this form, then in each group of above-mentioned enable circuits, supply with the identical traffic signal from the output terminal of same implant line length respectively.Therefore, the m that an is supplied with transmission signals is that the wiring influences such as waveform distortion of cause are equal degree by balanced with the cloth line resistance.
In other form of electro-optical-device driving circuit of the present invention, the back level separately of above-mentioned unit circuit and each corresponding setting respectively of above-mentioned unit circuit constitute by arranging a plurality of separate the 2nd identical unit circuits of layout.
According to this form, then the sample circuit etc. of level constitutes aggregate with the 2nd separate unit circuit of each corresponding setting of unit circuit after the enable circuits.And the 2nd unit circuit has identical layout mutually.The realizations such as sampling switch that this 2nd unit circuit for example is situated between and is provided with by impact damper as the back level at unit circuit.Like this, if " unit circuits " with identical topology at different levels of driving circuit then can alleviate the dispersiveness of the signal of access between unit circuit as component unit.
In other form of electro-optical-device driving circuit of the present invention, above-mentioned output terminal branches into 2 series, supply with above-mentioned enable signal with 4 series, above-mentioned enable circuits be by the many groups of mutual arrangement by supply with 2 series in the above-mentioned 4 serial enable signals a pair of unit circuit constituted the 1st group and supply with other 2 series in the enable signal of above-mentioned 4 series a pair of unit circuit constituted the 2nd group form.
According to this form, then branch into 2 series and be input to the enable circuits from each transmission signals of shift register output.In enable circuits, owing to generate 2 kinds of sample circuit drive signals, therefore have in a pair of unit circuit of the transmission signals of 2 series in input respectively from the identical traffic signal of 2 series of input, supply with the enable signal of 2 series.Like this, the sample circuit drive signal generates with 2 times frequency.
Also can constitute even such enable circuits enable signal is 2 series, yet adopt 4 series here.That is, the mutual different enable signal of 4 series supplies in the paired unit circuit with each 2 series.It is low when ratio adopted 2 series when the pulsed frequency of each enable signal adopted 4 series.Therefore, under the high situation of driving frequency, adopt 4 series to be easier to generate enable signal.In addition, under this meaning, can also use 6 series, 8 series ... wait the above enable signals of 4 series, and in fact, if consider wiring draw around or enable signal between the error etc. of pulse shape, the most suitable about 4 series.At this moment, the wiring of above-mentioned branch also can be that output terminal branches into 2 strands, and above-mentioned 2 strands of output terminals dispose for above-mentioned input end left and right symmetrically.Thus, can eliminate signals disperse by the inhomogeneous generation of layout.
Electro-optical device of the present invention possesses the electro-optical-device driving circuit (wherein, comprising its various forms) of the invention described above, above-mentioned many data lines and above-mentioned multi-strip scanning line, above-mentioned a plurality of pixel cells in order to address the above problem.
According to electro-optical device of the present invention, then owing to possess the electro-optical-device driving circuit of the invention described above, therefore can alleviate and show badly, alleviate the demonstration speckle of taeniae shape especially, can carry out high-quality demonstration.This electro-optical device for example can realize electrophoretic apparatuss such as liquid-crystal apparatus, organic El device, Electronic Paper, the various display device such as (Field Emission Display and surface conductive type electron emission display devices) of having utilized the display device of electronic emission element.
Electronic equipment of the present invention is in order to address the above problem the electro-optical device (wherein, comprising its various forms) that possesses the invention described above.
According to electronic equipment of the present invention, then possesses the electro-optical device of the invention described above.Therefore this electro-optical device can carry out high-quality demonstration owing to carry electro-optical-device driving circuit of the present invention.This electronic equipment for example can be applicable to various electronic equipments such as the video tape recorder, workstation, television telephone set, POS terminal, touch panel of projection display device, television receiver, portable telephone, electronic notebook, word processor, find a view type or monitor direct viewing type.
This effect of the present invention and other advantage will be clear and definite from the example of following explanation.
Description of drawings
Fig. 1 is the integrally-built planimetric map of the electro-optical device of expression example.
Fig. 2 is the H-H ' sectional view of Fig. 1.
Fig. 3 is the planimetric map of the circuit structure on the tft array substrate of electro-optical device of expression example.
Fig. 4 is the block diagram of structure of main drive system of the electro-optical device of expression example.
The layout structure of the enable circuits in the Circuits System of Fig. 5 presentation graphs 4.
The circuit layout of the comparative example of Fig. 6 presentation graphs 5.
Fig. 7 (A), (B) be the shift register in the Circuits System of presentation graphs 4 and the distributing between the enable circuits.
Fig. 8 is the sequential chart that is used to illustrate the method for driving electro-optical device of example.
Fig. 9 is the Ning section of expression as an example of the projection type colour display device of the example of the electronic equipment that has adopted electro-optical device of the present invention.
Symbol description
2 book sweep traces, 3 data lines, 5 wirings, 6 image signal lines, 7 sample circuits, 9a pixel electrode, 10TFT array base palte, 10a image display area, 11,12 subregions, 51 shift registers, 52 enable circuits, 52a, 52bNAND circuit, 54NOT circuit, 71 sampling switchs, 81 enable supply line, 101 data line drive circuits, 104 scan line drive circuits, VID1～VID6 picture signal, ENB1～ENB4 enable signal, Pi transmission signals, Qi reshaping signal, Si sample circuit drive signal
Embodiment
Referring to figs. 1 through Fig. 6 example of the present invention is described.Following example is that electro-optical device of the present invention is used in situation in the liquid-crystal apparatus.
The structure of liquid-crystal apparatus
The one-piece construction of the liquid-crystal apparatus in this example at first, is described referring to figs. 1 through Fig. 3.Fig. 1 is the planimetric map of the liquid-crystal apparatus watched from subtend substrate one side, and Fig. 2 is the H-H ' sectional view of Fig. 1.
In Fig. 1 and Fig. 2, liquid-crystal apparatus is made of the tft array substrate 10 and the subtend substrate 20 of subtend configuration.Enclose liquid crystal layer 50 between tft array substrate 10 and subtend substrate 20, tft array substrate 10 is bonding mutually by the encapsulant 52 that is set in place in the sealing area around the image display area 10a with subtend substrate 20.Encapsulant 52 is made of for example ultraviolet hardening resin, the thermosetting resin etc. that are used for 2 plate bases are pasted together, in manufacturing process, after having applied on the tft array substrate 10, makes its sclerosis by ultraviolet ray irradiation, heating etc.In addition, in encapsulant 52, scatter clearance materials such as glass fibre that the interval (gap between substrate) be used to make tft array substrate 10 and subtend substrate 20 becomes predetermined value or beaded glass.Inboard parallel with the sealing area that disposes encapsulant 52 is provided with the architrave photomask 53 of light-proofness in the architrave zone of specified image viewing area 10a in subtend substrate 20 1 sides.Wherein, part or all of such architrave photomask 53 also can be set to built-in photomask in tft array substrate 10 1 sides.
The neighboring area that is arranged in image display area 10a periphery on tft array substrate 10 is one side be provided with data line drive circuit 101 and external circuit-connecting terminal 102 along tft array substrate 10.Along two limits adjacent, and covered by architrave photomask 53 scan line drive circuit 104 is set like that with this limit.And then, for coupling together between two scan line drive circuits 104 that are arranged on image display area 10a both sides like this,, and covered by architrave photomask 53 many wirings 105 are set like that along a remaining limit of tft array substrate 10.In addition, between tft array substrate 10 and subtend substrate 20, be provided for guaranteeing the Lead-through terminal up and down 106 that conducts between 2 plate bases.
Among Fig. 2, on tft array substrate 10, pixel switch with TFT or various wirings etc. above formation pixel electrode 9a, and then form alignment films in the above.On the other hand, among the image display area 10a on subtend substrate 20, insert and put liquid crystal layer 50 and form the counter electrode 21 relative with a plurality of pixel electrode 9a.That is,, between pixel electrode 9a and counter electrode 21, form liquid crystal and keep electric capacity by applying voltage respectively.On this counter electrode 21, form the photomask 23 of latticed or striated, and then cover alignment films in the above.Liquid crystal layer 50 for example is made of liquid crystal a kind of or that mix multiple nematic liquid crystal, between these a pair of alignment films, is taken as predetermined state of orientation.
In addition,, on tft array substrate 10, remove beyond data line drive circuit 101 and the scan line drive circuit 104, also form sample circuit 7 described later etc. though here do not illustrate.Remove beyond these, can also be formed for checking in the manufacture process or the check circuit etc. of the quality of this liquid-crystal apparatus and defective etc. when dispatching from the factory.In addition, side in the emergent light outgoing of side of the projected light incident of subtend substrate 20 and tft array substrate 10, respectively for example with TN (twisted nematic) pattern, STN (super TN) pattern, D-STN (two-STN) each of the mode of operation of pattern etc. or the black pattern of normality white mode/normality is corresponding, in predetermined direction configuration polarizing coating, phase retardation film, polarization plates etc.It more than is the summary of this liquid-crystal apparatus structure.
Secondly, the primary structure of this liquid-crystal apparatus is described to Fig. 7 with reference to Fig. 3.Here, Fig. 3 represents the structure of the major part of this liquid-crystal apparatus.In addition, among Fig. 3, for convenience of description, opposite up and down with Fig. 1.Fig. 4 represents driving circuit relevant with the shaping of transmission signals in the structure shown in Figure 3, and the circuit layout of the enable circuits in the Circuits System of Fig. 5 presentation graphs 4, Fig. 6 are represented its comparative example respectively.Fig. 7 represents the layout of the wiring between shift register and the enable circuits.
In Fig. 3 and Fig. 4, liquid-crystal apparatus becomes and inserts and puts tft array substrate 10 that liquid crystal layer subtend configuration is made of for example quartz base plate, glass substrate or silicon substrate etc. and subtend substrate 20 (here not diagram), control is applied to the voltage on the subregion pixel electrodes arranged 9a among the image display area 10a, is applied to the structure of the electric field on the liquid crystal layer in each pixel modulation.Thus, control the transmission light quantity between 2 plate bases, with the gray scale display image.This liquid-crystal apparatus adopts the tft active matrix type of drive, among the pixel display area 10a in tft array substrate 10, the multi-strip scanning line 2 and the data line 3 of a plurality of pixel electrode 9a that formation is disposed rectangularly and cross arrangement mutually constitute and the corresponding pixel cell of pixel.In addition, though here do not illustrate, but between each pixel electrode 9a and data line 3, form according to the sweep signal of supplying with respectively via sweep trace 2 and control conducting, non-conduction TFT and be used to keep the memory capacitance that is applied to the voltage on the pixel electrode 9a.In addition, in the neighboring area of image display area 10a,, form driving circuits such as data line drive circuit 101, scan line drive circuit 104 as an example of electro-optical-device driving circuit of the present invention.
Data line drive circuit 101 comprises shift register 51, logical circuit 55 and sample circuit 7.Shift register 51 constitute according to the X one side clock signal C LX that is input to the predetermined period in the data line drive circuit 101 (with and inversion signal CLX ') and shift register initiating signal DX, from orders at different levels export transmission signals Pi (i=1 ..., n).
As shown in Figure 4,52 of enable circuits and each wiring 5 a pair of NAND circuit that are connected, promptly NAND circuit 52a and NAND circuit 52b constitute a unit respectively, arrange a plurality of these units.NAND circuit 52a and NAND circuit 52b be respectively as an example of " unit circuit " of the present invention, constitute input transmission signals Pi (i=1 ..., n) one, output Shaping signal Qi (i=1 ..., 2n) one.In addition, here, NAND circuit 52a and NAND circuit 52b are equivalent to an example of " group " of the present invention.Specifically, NAND circuit 52a and NAND circuit 52b be supplied to identical transmission signals Pi (i=1 ..., n) with the enable signal ENB1～ENB4 of 4 series in different signal mutually, in each circuit, ask transmission signals and enable signal with non-, as reshaping signal Qi (i=1 ..., 2n) output.
In addition, enable circuits 52 is connected with shift register 51 by the wiring 5 of many arrangements.By these wirings 5, from the transmission signals Pi of shift register 51 output (i=1 ..., n) be input to NAND circuit 52a and NAND circuit 52b respectively.Here, branch into 2, identical transmission signals is divided into 2 series, supply in the enable circuits 52, therefore its wiring number is reduced by half in input end one side owing to constitute the output terminal of wiring 5.Such structure help distributing the saving space, narrow spacing.
For convenience of explanation, show an image signal line 6 among Fig. 3, and in fact, as shown in Figure 4, in order picture signal to be carried out serial-parallel conversion (that is, phase demodulation), configuration multiple bar chart image signal line 6." serial-parallel conversion " is for the rising that suppresses driving frequency and realizes that the image of high-resolution shows, the picture signal of serial for example is transformed to 3 phases, 6 phases, 12 phases, 24 phases ... wait a plurality of parallel picture signals (promptly, phase demodulation) after, the technology that is situated between and supplies with for this electro-optical device by multiple bar chart image signal line.In this case, a plurality of picture signals are sampled simultaneously by a plurality of sampling switchs, supply with simultaneously for many data lines.In this example, the picture signal serial-parallel expands into 6 phases, and these picture signals VID1～VID6 is input to sample circuit 7 via 6 image signal lines 6 respectively.And, sample circuit drive signal Si (i=1 ..., 2n) be input to together in 6 sampling switchs 71, make the picture signal VID1～VID6 of 6 series sample simultaneously with each sampling switch 71.
If supply with the parallel picture signal that the such conversion of the picture signal of serial is obtained simultaneously, then can in every group, carry out picture signal input for data line 3, can suppress driving frequency.Here, the pixel cell of image display area 10a is with simultaneously driven 6 data lines 3 are corresponding, is driven in each of the subregion 11 of Fig. 4 and 12.
Scan line drive circuit 104 is for according to data-signal and the sweep signal a plurality of pixel electrode 9a along the orientation scan matrix shape ground configuration of sweep trace 2, be constructed such that to multi-strip scanning line 2 orders apply Y side clock signal C LY according to the reference clock that applies as sweep signal (with and inversion signal CLY ') and the sweep signal of shift register initiating signal DY generation.At this moment, on each sweep trace 2, apply voltage simultaneously from both sides.
In addition, various timing signals such as clock signal are generated by not shown timing generator, supply in each circuit on the tft array substrate 10.In addition, also supply with the driving of each driving circuit necessary supply voltage etc. from external circuit.And then, to the signal wire of drawing, supply with counter electrode current potential LCC from external circuit from Lead-through terminal 106 up and down.Counter electrode current potential LCC supplies to counter electrode 21 via Lead-through terminal 106 up and down.Counter electrode current potential LCC becomes the potential difference (PD) that is used for suitably keeping with pixel electrode 9a, forms the reference potential that liquid crystal keeps the counter electrode 21 of electric capacity.
The structure of NAND circuit
As shown in Figure 5, in this example, paired NAND circuit 52a and NAND circuit 52b have identical layout.Therefore, there are not the difference on the layout in NAND circuit 52a and NAND circuit 52b, make each other effect or from around wiring or the electric effect equilibrium of the stray capacitance that is subjected to such as element etc., and can suppress the dispersiveness of the output signal value in each.And then, in this example, right with each of the arranged spaced NAND circuit of equalization.Thus, though between do not have difference on the layout yet, and can suppress the dispersiveness of output signal value.
With respect to this, common enable circuits as shown in Figure 6, minute surface is paired NAND circuit 52a ' and the NAND circuit 52b ' of layout symmetrically.This symmetrical layout plays a role aspect wiring between the shared NAND of being configured in circuit 52a ' and NAND circuit 52b ' or element etc., can seek the such advantage of spacingization and set out and be widely adopted.In the example of Fig. 6, common source wiring 52c ' in NAND circuit 52a ' and NAND circuit 52b '.Yet in this case, the symmetry on the layout of wiring or element is destroyed the systematicness of their mutual relative distance on the contrary.For example, wiring that wiring in the NAND circuit 52a ' or element and paired NAND circuit 52b ' are interior or the relative distance between the element, and they are different with wiring or the relative distance between the element in the adjacent NAND circuit 52b ' of its opposite side (being the right side in Fig. 6).In addition, paired NAND circuit 52a ' and NAND circuit 52b ' are though be clipped in the middle shared power-supply wiring 52c ' and approaching, and each is for leaving on layout at mutual adjacent NAND circuit 52a ' and the NAND circuit 52b ' of an opposite side.If relative distance is different like this,, therefore becomes and on the size of signal, produce dispersed reason then because the electric effect difference of the stray capacitance of effect etc. each other.
Ring if consider above film, then, preferably for example also as shown in Figure 7, carry out layout symmetrically for paired NAND circuit 52a and NAND circuit 52b for wiring 5.In Fig. 7 (A), the output terminal of a wiring 5 branches into symmetrical 2 wirings.In Fig. 7 (B), make the incision breach segment the output terminal of a wiring 5 like that and prop up.
Like this, if liquid-crystal apparatus according to this example, then because the sample circuit drive signal Si that each that makes NAND circuit 52a in the enable circuits 52 and NAND circuit 52b to having identical layout, therefore can suppress to be exported (i=1 ..., 2n) dispersiveness.Its result, can alleviate with sample circuit drive signal Si (i=1 ..., 2n) dispersiveness be thereby the demonstration that produces bad, the difference in brightness of the subregion 11 that manifests as the demonstration speckle of taeniae shape and subregion 12 particularly.
The driving method of liquid-crystal apparatus
Secondly, to Fig. 8 the work of this liquid-crystal apparatus is described with reference to Fig. 3, particularly transmission signals Pi (i=1 ..., n) be shaped as sample circuit drive signal Si (i=1 ..., 2n) process.Fig. 8 is the sequential chart of the various signals in the drive system shown in Figure 4.
Shown in the sequential chart of Fig. 8, in data line drive circuit 101, at first from shift register 51 according to P1, P2 ... the order export transmission signals Pi (i=1 ..., n).At this moment, with the timing of complementation export odd number transmission signals P2k-1 and even number transmission signals P2k (wherein, k=1 ..., n/2).Here, identical transmission signals Pi (i=1 ..., n) become 2 series through wiring 5, output to the enable circuits 52 of logical circuit 55.
In enable circuits 52, each of NAND circuit 52a and NAND circuit 52b get the transmission signals Pi that imported (i=1 ..., n) some with enable signal ENB1～ENB4 with non-.Since paired NAND circuit 52a and NAND circuit 52b imported simultaneously transmission signals Pi (i=1 ..., n), therefore import among enable signal ENB1～ENB4 different signal mutually, make respectively with different mutually timing output sample circuit drive signal Si (i=1 ..., 2n).Then, by asking among NAND circuit 52a and the NAND circuit 52b with non-, transmission signals Pi (i=1 ..., n) each waveform according to the waveform of the narrower enable signal ENB1～ENB4 of pulse width by shaping, the be enabled pulse width d1 restriction of signal of pulse width.From the such shaping of enable circuits 52 output reshaping signal Qi (i=1 ..., 2n).
Enable signal ENB1～ENB4 is because phase deviation makes mutual pulse not overlapping, therefore identical transmission signals Pi (i=1 ..., n) branch and the NAND circuit 52a that imports and the centering of NAND circuit 52b, according to the enable signal of importing respectively, export the pulse waveform of mutually different timing.Transmission signals Pi (i=1 ..., n) because according to being input to outputs such as clock signal C LX in the shift register 51, therefore the restriction that aspect its high frequencyization, produces owing to the clock period, has certain boundary, if and get itself and enable signal and the non-pulse width that limits by enable circuits 52 like this, then can realize narrow and smallization.
Here, because paired NAND circuit 52a and NAND circuit 52b have identical layout, and each is to uniformly-spaced to arrange, therefore make NAND circuit 52a and 52b to and between the film of stray capacitance etc. of effect ring balanced.Thereby, can suppress reshaping signal Qi (i=1 ..., 2n) mutual dispersiveness.
Each output of NAND circuit 52a and NAND circuit 52b is input to the NOT circuit 54 of a plurality of arrangements respectively.From NOT circuit 54 reshaping signal Qi (i=1 ..., 2n) inversion signal as sample circuit drive signal Si (i=1 ..., 2n) output.That is, transmission signals Pi (i=1 ..., n) by enable circuits 52 and NOT circuit 54, be processed to predetermined pulse width sample circuit drive signal Si (i=1 ..., 2n).
Sample circuit drive signal Si (i=1 ..., 2n) drive 71 groups of the sampling switchs of sample circuit 7, sampling switch 71 is supplied with picture signal VID1～VID6 from image signal line 6.Like this, picture signal VID1～VID6 is sampled, and because sample circuit drive signal Si (i=1 ..., 2n) pulse width consistent be pulse width d1, so the pulse width of the data-signal that is generated also stipulated by pulse width d1, and consistent with it.And then, as mentioned above, can suppress reshaping signal Qi (i=1 ..., 2n) and sample circuit drive signal Si (i=1 ..., 2n) the mutual dispersiveness that causes by high frequency noise.Thus, can alleviate with sample circuit drive signal Si (i=1 ..., 2n) dispersiveness be thereby the demonstration that produces bad, particularly can alleviate the difference in brightness of subregion 11 with the subregion 12 of the demonstration speckle that between the subregion 11 and 12 that writes picture signal by the data line 3 that drives simultaneously, is revealed as the vertical stripe shape.
More than, specifically understand example of the present invention, and the present invention is not limited to this example, can carry out various distortion and implement.For example, the serial number of the transmission signals among the present invention, enable signal or picture signal can at random be set.In example, when transmission signals being sent, 5 branch into 2 series, and transmission signals also can branch into 3 series or 4 series etc. more by connecting up for enable signal.In this case, can further reduce wiring quantity from the shift register to the enable circuits.But, in this case, if the serial number of enable signal is not set at least more than or equal to the branches of transmission signals then can not drives aptly.In addition, in example, enable signal is taken as 4 series of enable signal ENB1～ENB4, and the serial number of enable signal both can lack (for example 2 series) than it, also can be more than it (for example 8 series or more than it).If corresponding high frequencyization of further carrying out driving frequency with high-definition then increases the serial number of enable signal in order to narrow pulse width.
In addition, enable circuits 52 usefulness NAND circuit 52a in the example and NAND circuit 52b constitute, and also can constitute the AND circuit of the function that comprises NOT circuit 54 of one.In addition, in the present invention, " unit circuit " like this be as long as have identical layout in " group " of having divided into groups in each series of same transmission signals, circuit structure self (for example transistorized kind, perhaps the annexation of parts number, element and element etc.) is not particularly limited.
In addition, in example, export from " in proper order " at different levels, and this refers to from outputs one by one at different levels, not necessarily is limited to the sequential of transmission signals and physical property at different levels and arranges corresponding situation from the transmission signals of shift register.
3: electronic equipment
More than Shuo Ming liquid-crystal apparatus for example is applicable to projector.Here, the projector that the liquid-crystal apparatus of above-mentioned example is used as light valve is described.
Fig. 9 is the planimetric map of the structure example of expression projector.As shown in the drawing, in projector 1100 inside, the lamp unit 1102 that is made of white light sources such as Halogen lamp LEDs is set.From the projected light of these lamp unit 1102 outgoing by being arranged on the three primary colors that 4 catoptrons 1106 in the light valve and 2 dichronic mirrors 1108 are separated into RGB, incide as with liquid-crystal apparatus 100R, 100B and the 100G of the corresponding light valve of each primary colors.The structure of liquid-crystal apparatus 100R, 100B and 100G and above-mentioned liquid-crystal apparatus are equal to, and in each the R, the G that supply with from imaging signal processing circuit, the primary signal of B are modulated.The light of having been modulated by these liquid-crystal apparatus incides colour splitting prism 1112 from three directions.In colour splitting prism 1112, synthetic image of all kinds penetrates as coloured image.Coloured image projects on screen 1120 grades through projecting lens 1114.
In this projection type colour display device,, can carry out seldom or hardly taking place the high-quality demonstration of brightness speckle by using the liquid-crystal apparatus of above-mentioned example.
In addition, the liquid-crystal apparatus of above-mentioned example can also be applicable to the direct viewing type beyond the projector or the colour display device of reflection-type.In this case, on subtend substrate 20 and zone pixel electrode 9a subtend, can form the color filter of RGB in the lump with its diaphragm.Perhaps, also can be on tft array substrate 10 below the pixel electrode 9a RGB subtend, form color-filter layer with look resist etc.And then, under each above-mentioned situation,, then can improve the light gathering efficiency of incident light if on subtend substrate 20, be provided with and 1 pair 1 corresponding lenticule of pixel, improve display brightness.And then, by on subtend substrate 20, pile up all different interfering layer of refractive index of each layer, utilize interference of light, also can form the dichroic filter that sends the RGB look.According to the subtend substrate that has this dichroic filter, then can carry out brighter demonstration.
More than, enumerate liquid-crystal apparatus as an example and liquid crystal projector has illustrated the present invention, and the electro-optical device that can carry out matrix driving beyond the liquid-crystal apparatus also is the scope of application of the present invention.As such electro-optical device, for example can enumerate electroluminescence device or electrophoretic apparatus, utilize the display device (Field Emission Display and surface conductive type electron emission display device) of electronic emission element etc.In addition, electronic equipment of the present invention is realized by possessing this electro-optical device of the present invention, remove beyond the above-mentioned projector, can also be as video tape recorder, automobile navigation apparatus, pager, electronic notebook, desk-top calculator, word processor, workstation, television telephone set, the POS terminal of television receiver, find a view type or monitor direct viewing type, possess the various electronic equipments such as device of touch panel and realize.
The invention is not restricted to above example, can suitably change in the aim of not violating the invention of reading from the scope and the instructions integral body of technical scheme or the scope thought, the electronic equipment that is accompanied by electro-optical-device driving circuit and this electro-optical device of this change and possesses this electro-optical device is also contained in the technical scope of the present invention.
Claims (11)
1. electro-optical-device driving circuit, this electro-optical-device driving circuit drives electro-optical device, many data lines that this electro-optical device possesses that mutual intersection extends and multi-strip scanning line, be electrically connected with above-mentioned data line and above-mentioned sweep trace respectively, be arranged in a plurality of pixel cells in the image display area, this electro-optical-device driving circuit is characterised in that:
Possess,
Shift register from order output transmission signals at different levels;
With above-mentioned settings accordingly at different levels, have the input end of input said transmission signal and the said transmission signal that output is imported respectively, branch into many branches' wirings of m output terminal, wherein m is the natural number more than or equal to 2;
Supply is made of respectively the pulse of the preset width narrower than said transmission signal, and output regularly different respectively enable supply line more than many of the enable signal that equals m series;
Output is shaped as the pulse width according to above-mentioned enable signal the enable circuits of the reshaping signal of above-mentioned preset width; And
According to above-mentioned reshaping signal sampling image signal, supply to the sample circuit of above-mentioned many data lines,
Above-mentioned enable circuits comprises a plurality of unit circuits,
Above-mentioned unit circuit is electrically connected to an output terminal and the mutual different above-mentioned supply line that enables of series of the above-mentioned m of branching into respectively,
In the group that is made of m above-mentioned unit circuit, each above-mentioned unit circuit has identical layout mutually.
2. electro-optical-device driving circuit according to claim 1 is characterized in that:
Above-mentioned unit circuit is equally spaced arranged in above-mentioned group.
3. electro-optical-device driving circuit according to claim 1 is characterized in that:
Above-mentioned unit circuit has identical layout mutually between a plurality of above-mentioned group.
4. electro-optical-device driving circuit according to claim 1 is characterized in that:
Equally spaced arrange for above-mentioned a plurality of groups.
5. electro-optical-device driving circuit according to claim 1 is characterized in that:
In the wiring of above-mentioned branch, the above-mentioned length of arrangement wire that branches into the part of m series equates respectively for an above-mentioned m unit circuit.
6. electro-optical-device driving circuit according to claim 1 is characterized in that:
In the wiring of the above-mentioned branch of each bar, the length from above-mentioned input end to above-mentioned each output terminal equates respectively.
7. electro-optical-device driving circuit according to claim 1 is characterized in that:
The back level of each of above-mentioned unit circuit, each the corresponding setting by being arranged with a plurality of and above-mentioned unit circuit, the 2nd unit circuit of separate identical topology and constituting.
8. electro-optical-device driving circuit according to claim 1 is characterized in that:
Above-mentioned output terminal branches into 2 series, supplies with above-mentioned enable signal with 4 series,
Above-mentioned enable circuits, by 2 series in the enable signal of supplying with above-mentioned 4 series a pair of unit circuit constituted the 1st group and supply with other 2 series in the enable signal of above-mentioned 4 series a pair of unit circuit constituted the 2nd group, a plurality of mutual arrangements form.
9. electro-optical-device driving circuit according to claim 8 is characterized in that:
The output terminal of above-mentioned branch wiring branches into 2 strands, and above-mentioned relatively input end left and right symmetrically disposes above-mentioned 2 strands of output terminals.
10. electro-optical device is characterized in that:
Possesses the electro-optical-device driving circuit described in each of claim 1 to 9, above-mentioned many data lines and above-mentioned multi-strip scanning line and above-mentioned a plurality of pixel cell.
11. an electronic equipment is characterized in that:
Possesses the electro-optical device of recording and narrating in the claim 10.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP223496/2004 | 2004-07-30 | ||
| JP2004223496 | 2004-07-30 | ||
| JP145053/2005 | 2005-05-18 |
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| CN1728228A CN1728228A (en) | 2006-02-01 |
| CN100392483C true CN100392483C (en) | 2008-06-04 |
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| CNB2005100852002A Expired - Fee Related CN100392483C (en) | 2004-07-30 | 2005-07-22 | Electro-optical-device driving circuit, electro-optical device, and electronic apparatus |
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| TWI420460B (en) * | 2011-05-02 | 2013-12-21 | Au Optronics Corp | Electrophoretic panel and driving method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030112230A1 (en) * | 2001-11-30 | 2003-06-19 | Sharp Kabushiki Kaisha | Signal line drive circuit and display device using the same |
| CN1129026C (en) * | 1999-06-04 | 2003-11-26 | 权五敬 | Actuator of liquid crystal display device |
| CN1488131A (en) * | 2001-10-17 | 2004-04-07 | 索尼公司 | Display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1129026C (en) * | 1999-06-04 | 2003-11-26 | 权五敬 | Actuator of liquid crystal display device |
| CN1488131A (en) * | 2001-10-17 | 2004-04-07 | 索尼公司 | Display device |
| US20030112230A1 (en) * | 2001-11-30 | 2003-06-19 | Sharp Kabushiki Kaisha | Signal line drive circuit and display device using the same |
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