CN1093176A - Liquid crystal indicator - Google Patents
Liquid crystal indicator Download PDFInfo
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- CN1093176A CN1093176A CN94103208A CN94103208A CN1093176A CN 1093176 A CN1093176 A CN 1093176A CN 94103208 A CN94103208 A CN 94103208A CN 94103208 A CN94103208 A CN 94103208A CN 1093176 A CN1093176 A CN 1093176A
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- column electrode
- liquid crystal
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3622—Control of matrices with row and column drivers using a passive matrix
- G09G3/3625—Control of matrices with row and column drivers using a passive matrix using active addressing
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
A kind of liquid crystal indicator, it comprises, a plurality of column electrodes of a kind of usefulness and row electrode drive, and the liquid crystal cell that a plurality of column electrodes are selected simultaneously; One is applied to column voltage generation circuit on each row electrode to voltage according to the orthogonal transformation signal, and described orthogonal transformation signal is with a kind of orthogonal function, the picture signal of selected line electrode position is carried out conversion and obtained to corresponding to display element the time; And the column electrode option code type signal formed by orthogonal function of a kind of basis, voltage is applied to the row voltage generation circuits of selected line electrode simultaneously.
Description
The present invention relates to a kind of liquid crystal indicator, this device has used a kind of liquid crystal display cells with fast response characteristic.The invention particularly relates to a kind of passive matrix liquid crystal indicator, in this device, row selects voltage to be produced by the multirow system of selection.
Before this, used a kind of liquid crystal display cells, as a kind of supertwist nematic (being called for short STN) liquid crystal cell in response to executing voltage effective value.In order to improve the commutating speed of demonstration, need a pair of liquid crystal cell with fast response characteristic.Yet there is a problem in the past in the liquid crystal cell with fast response characteristic, and promptly ON(opens) state and OFF(close) optical differences between the state is very little, thereby contrast is relatively poor.
As a kind of widely used LCD drive method, a kind of addressing method line by line of selecting and driving each scan line and each liquid crystal cell is arranged, the rectangular arrangement of liquid crystal cell wherein.When this line by line addressing method be used to have not very oversize, response time response time when being about 200 milliseconds liquid crystal cell, compare the cycle length of the voltage waveform of addressing method with line by line, the above-mentioned response time seems quite long.Yet, being short to when being about the 20-100 millisecond when the response time, the above-mentioned response time is just approached the cycle length of the voltage waveform of addressing method line by line.As a result, a certain selection cycle is in a certain pixel of ON state in the time in addressing line by line, will turn back to the situation of OFF state in the time at a non-selection cycle.That is to say that the luminance difference between ON state and the OFF state is very little.This phenomenon is called the frame response.
In order to eliminate the response of this time frame, consider to improve the electric voltage frequency of addressing line by line, the response speed of the liquid crystal cell that has been enhanced with response.Yet, uprised because be applied to the frequency spectrum of the voltage waveform that element gets on, so high-frequency can cause the unevenness of demonstration.
As a kind of driving method of eliminating above-mentioned defective, suggestion use a kind of a plurality of scan lines as a collection of multirow system of selection of selecting (being called for short the MLS method).When a plurality of scan lines were elected to be driving simultaneously, can shorten under the situation that does not change the selection signal pulse width cycle length that is applied to the selection signal on the single column electrode.The multirow system of selection is just like SID'92 DIGEST(1992) P.228 described in the time select the method for all scan lines, SID'92 DIGEST(1992 is also arranged) P.238 described in the time select the method for a plurality of (but not being whole) scan line.
In two kinds of methods, when two level of selecting signal were represented with+1 and-1, the time sequencing of each selection signal of issuing selected scan line of while was by+1 and-1 orthogonal function of forming.When representing with+1 and-1 corresponding to the data of the ON of a certain demonstration and OFF, the signal rows that video data is provided is to provide with the voltage that the comparative result according to orthogonal function and each data draws.
A kind of use the 1/N dutycycle to drive and two frames in the addressing method line by line of a certain alternating voltage, corresponding to first to N column electrode of scan line with just selecting output scanning, then, first to N column electrode finished an alternation waveform thus with the negative output scanning of selecting.Like this, just finished a DISPLAY ORDER.That is to say that in a DISPLAY ORDER of being made up of two frames, each column electrode has been scanned twice.Like this, single column electrode is selected immediately, and correspondingly, uses single column electrode driver just to be enough to control the polarity of the voltage of executing.
On the other hand, when using the MLS method, wherein selection cycle time and time in frame period identical with the selection cycle time in the driving method line by line with the time in frame period, in single DISPLAY ORDER, each scan line can be scanned 2L time, and wherein L is the simultaneously selected number of scanning lines.In this case, be distributed in the single DISPLAY ORDER if be used for the selection signal of scan line, just can shorten the cycle length that is applied to the selection signal on the column electrode.That is to say, compare, the reducing and to be checked of liquid crystal cell optical differences (between ON state and the OFF state) with the situation of driving method line by line.Correspondingly, a kind of driving method that is applicable to quick response element just can have been realized.Yet, in this case, must the independent polarity of controlling corresponding to the column electrode of a plurality of selected scan lines.The waveform of the column electrode when Figure 11 shows a routine L=3.Among Figure 11, R1-R9 represents column electrode respectively.
Put on L the polarity of voltage of selected line electrode simultaneously if use common column electrode driver to control independently, so just need L driver.When the L value obtains when very big, the sight mould of circuit just becomes very big, thereby makes liquid crystal indicator become expensive.In other words, the L value must be chosen as a desired value, and the frame response is reduced to minimum.
A kind of LCD drive method that the inventor of present embodiment once advised, the line number of selected scan line is L simultaneously, and controlled the polarity of column electrode effectively, referring to uncensored Japanese patent publication number is 27904/1994,27907/1994, and the description in USP 5,262,881 documents.This method is only sketched herein.
Suppose when selecting signal to be in active state, put on the voltage of each column electrode or be+Vr, perhaps be-Vr(Vr＞0), and in a non-select time, be 0.N column electrode is divided into L group, and has L column electrode to be selected simultaneously in each group.For for simplicity, suppose that N is an integer of taking advantage of to obtain with L, and N=M * L, promptly organizing number is M.In addition, contain selected group of column electrode while and be called the column electrode grouping.The column electrode of forming single column electrode grouping needn't be always continuously arranged.Can form a certain column electrode grouping with the method that column electrode positioned apart is gathered together.
Be applied to the selection voltage on the column electrode that constitutes m (m is arbitrary number of 1-m) selected line electrode grouping, can be with representing according to being applied to the L rank arrangement of vector on sequential that the voltage on the column electrode constitutes.The sequential of vector is arranged and is called the selection voltage matrix.In addition, composition selects the column vector of voltage matrix to be called the selection voltage vector.After having determined the selection voltage matrix, each of composition selection voltage matrix selects voltage vector unit to be applied on the corresponding column electrode with the form of voltage.With regard to all selected voltage vector, voltage was applied to each column electrode one by one and gets on, and had so just finished the selection of single column electrode grouping.
Hereinafter, will do an explanation to forming the method for selecting voltage matrix.First, contain matrix (orthogonal matrix) A=(a1 that L is capable, K is listed as to one, a2, ak) select, this matrix contains+Vr or-Vr unit, and the long-pending quantity multiple that is assumed to a unit matrix of matrix and same transpose of a matrix matrix, aq(q=1-k wherein) for having L first appropriate column vector, k is the integer (q is a natural number) of k 〉=L.When k is confirmed as when too big, be used for selecting the number of the necessary strobe pulse of column electrode just too big.Therefore, k should get a minimum value as much as possible.
Figure 12 represents the object lesson of a matrix A, L=4 wherein, and 8, and k=4,8.The result who uses several matrixes to drive liquid crystal cell can affirm, with Figure 12 (a) and the Hadamard matrix (c) can control the heterogeneity of demonstration.Under the situation of L ≠ 2P, can from a kth moment battle array, remove the way of any (K-L) row and form the matrix A that this L is capable, K is listed as, wherein the long-pending of matrix and same transpose of a matrix matrix is the quantity multiple of a unit matrix.
Uncensored Japanese patent publication in above citation number is in 27904/1994 and 27907/1994 document, stated a matrix-vector has been selected as the situation of selecting voltage matrix, wherein, at least by a1, a2, ak ,-a1 ,-a2,, the selection voltage vector that-ak forms is arranged.That is to say that available by the selection voltage matrix that 2K vector formed, in this 2K vector, each vector only occurs once in selecting voltage matrix.Use this system of selection, generally can realize driving to liquid crystal cell with the alternation form.
Can increase the number of forming the column vector of selecting voltage matrix.For example, when L=2, the various of electromotive force may situation have 2 in this column electrode grouping
4=16 kinds.Correspondingly, can form the selection voltage matrix that comprise 16 kinds of selection voltage vectors.Also have, the order of selecting voltage to arrange chronologically is arbitrarily.When the selection of each column electrode grouping finishes, can replace or move above-mentioned order, promptly can when finishing, each DISPLAY ORDER replace above-mentioned order.The heterogeneity of demonstration is controlled in the most handy replacement.
Hereinafter will be to selecting voltage vector to do a description selecting voltage to be applied to the time relationship that each column electrode gets on.In order to compress the frame response of fast response liquid crystal element, select signal in display sequence, preferably to have dispersing characteristic, thereby with regard to each column electrode, reduced the length of non-selection cycle time.In other words, should be according to selection signal (voltage) being applied in a certain column electrode grouping continuously with represented each yard shape of selection voltage vector, but should be being applied in a certain column electrode grouping, and controlling another column electrode with same voltage and divide into groups by single or some voltages of selecting voltage vectors to form.Usually because the non-selection cycle time can be shortened, so select the increase condensed frame response effectively of voltage vector packet count.Have again, preferably disperse to select signal equably.Like this, after containing one or some and selecting the voltage of voltage vectors to be applied in a certain column electrode grouping, this voltage just is applied in another column electrode grouping.
Provide signal shows signal, that be applied on the row electrode to determine to the row electrode by following method.Suppose that in being applied to the data of column electrode, series data β is made up of selected voltage vector, wherein unit+Vr is 1, and unit-Vr is 0, and series data γ is corresponding with each selected line electroplax.XOR is applied in the unit between serial β and the serial γ.Then, just can obtain an arithmetic sum from operation result.Correspondingly, when the first number with different value was i, then this arithmetic sum was 1.So the voltage that is applied on this column electrode is exactly Vi.
Like this, just from (L+1) individual voltage level number, select Vi, wherein V
0＜V
1＜...＜V
LThe absolute value of voltage level is to determine with the threshold pressure of liquid crystal cell etc.Preferably this value is selected, made column voltage become an alternating voltage.Work as Vi=((2i-L)/L) Vc and Vr=(N
1/2/ L) V
cThe time, the ratio V of voltage effective value
ON/ V
OffCan be maximum, here V
cFor being applied to the maximal value of voltage on the row electrode.Can also use other conditions except that above-mentioned condition.Promptly can adjust the value of Vi and Vr, thereby, obtain optimum contrast near under the situation of above-mentioned condition.
When video data is not to represent but when a gray level was arranged, then this gray level can obtain with the frame modulator approach with two values.In addition, can use Japanese publication number is the amplitude modulation method of being advised in 269560/1992 document.
Considered the situation of N=M * L in above describing.Yet, when the column electrode number of forming each column electrode grouping can not equate, will consider to use the dummy row electrode, thereby the column electrode number of forming each column electrode grouping is equated.
One object of the present invention is to provide a kind of have column electrode driver (a kind of row electrode voltage generation circuit), the suitable liquid crystal indicator that adopts driving method, wherein, L scan line selected simultaneously, thereby controlled the polarity of column electrode effectively.
Liquid crystal indicator provided by the present invention comprises:
One can be with liquid crystal cell a plurality of column electrodes and row electrode drive, that a plurality of column electrodes are selected simultaneously;
One is applied to the column voltage generation circuit of each row electrode to voltage according to the orthogonal transformation signal, and described orthogonal transformation signal is to obtain carrying out conversion corresponding to the picture signal of the simultaneously selected column electrode position of display element with orthogonal function, and
The column electrode option code type signal that basis is made up of orthogonal function is applied to row voltage generation circuits on the simultaneously selected column electrode to voltage, it is characterized in that,
Described row voltage generation circuits comprises:
A kind of column electrode selecting arrangement that each selected column electrode of while is carried out the order addressing, and
A kind of in response to corresponding data in the column electrode option code type signal, voltage is applied to the capable voltage generation circuit that each column electrode of being selected by the column electrode selecting arrangement gets on.
In foregoing invention, the row voltage generation circuit is applied to the voltage of column electrode option code type indication polarity by on each column electrode in the column electrode grouping of column electrode selecting arrangement addressing simultaneously.
As an embodiment of liquid crystal indicator of the present invention, the row voltage generation circuit comprises a column electrode option code type setting device, is used for exporting and being applied to the corresponding column electrode option code of the voltage type signal of each column electrode to be selected; And one in response to the sign indicating number type that sets by column electrode option code type setting device, voltage is applied to the column electrode drive unit that each column electrode by the addressing of column electrode selecting arrangement gets on.
In the above-described embodiments, column electrode option code type setting device provides voltage sign indicating number type to the column electrode drive unit simultaneously, and these yards type will be applied to by on each column electrode in the column electrode grouping of column electrode selecting arrangement addressing.
As an embodiment of liquid crystal indicator of the present invention, the column electrode drive unit comprises a liquid crystal display drive circuit, and this driving circuit receives N selection signal, and (N: the column electrode sum), each selects signal corresponding to a column electrode; This driving circuit receives N voltage signalization, and each signalization is corresponding to a column electrode number; This driving circuit is applied to the capable voltage corresponding to the voltage signalization by on the column electrode of selecting the signal addressing; The column electrode selecting arrangement comprises that one selects the signal parallel output device, this device becomes active signal to each the selection signal corresponding to each selected line electrode, each selection signal corresponding to each non-selection column electrode is become non-active signal, so as to selecting signal to offer liquid crystal display drive circuit to each; Column electrode option code type setting device comprises the voltage signalization output device that walks abreast, offering liquid crystal display drive circuit corresponding to the corresponding data in the column electrode option code type signal of each selected line electrode as the voltage signalization.
In the above-described embodiments, each parallel output device offers liquid crystal display drive circuit to information of expression column electrode (these column electrodes are formed the electrode grouping of row to be selected) and the information of indicating to be applied to the voltage sign indicating number type on the column electrode in batches.Among the embodiment in the described liquid crystal indicator of the invention described above, the also line output number of selection signal parallel output device equals the also line output number of the parallel output device of voltage signalization.In this case, each parallel output device has identical progression, thereby can further simplify judgement and control to column electrode option code type.
In the embodiment of liquid crystal indicator of the present invention, select the also line output number signal parallel output device and line output number and the parallel output device of voltage signalization to equal the total N of column electrode.In this case, each parallel output device has identical distance and counts N, thereby can further simplify judgement and control to displacement electrode option code type.
In liquid crystal indicator embodiment of the present invention, select the signal parallel output device to comprise a latch cicuit.This latch cicuit latch pulse is according to the selection signal latch option code type signal that will offer liquid crystal display drive circuit.Used latch pulse is synchronous with the switching timing time that contains the group selection of selected line electrode simultaneously, and the selection signal code type that will be latched in view of the above outputs to liquid crystal display drive circuit.The parallel output device of voltage signalization comprises a latch cicuit.This latch cicuit latchs column electrode option code type signal with latch pulse, outputs to liquid crystal display drive circuit being latched signal.
In the present embodiment, latch circuit latches makes the column electrode in the column electrode grouping to be selected be selected to active information, and latch the non-active information of being selected to of other column electrodes that makes, thereby offer liquid crystal display drive circuit all column electrodes being shown as selection and non-selected information.
In an embodiment of liquid crystal indicator of the present invention, select the signal parallel output device to comprise a shift register, this shift register is shifted to the data of active cycle length of demonstration selection signal, and each level that is connected in latch cicuit is had tap output.The parallel output device of voltage signalization comprises a shift register, and a string column electrode option code of this register pair type is shifted, and each level that is connected in latch cicuit is had tap output.
In the present embodiment, shift register is carried out displacement continuously to selecting the signal code type, thereby makes the active information that is selected to of column electrode in the column electrode grouping to be selected, is latched circuit and is latched in latching timing time.
In the embodiment of liquid crystal indicator of the present invention, offer the shift clock frequency of the shift register of the parallel output device of voltage signalization, than the shift clock frequency height that offers the shift register of selecting the signal parallel output device.
In the present embodiment, the shift register of the parallel output device of voltage signalization is shifted to data to the speed of selecting the signal code type to be shifted to be higher than shift register, and offers next column electrode grouping coming from the different sign indicating number types that are applied to the column electrode grouping.
In an embodiment of liquid crystal indicator of the present invention, selecting the parallel output terminal number of signal parallel output device is natural number M, here M contains the group number of selected line electrode group simultaneously, the parallel output terminal number of the parallel output device of voltage signalization is natural number L, and L is for forming the column electrode number of each group here.
In the present embodiment, the parallel output terminal of the parallel output device of voltage signalization is several to be counted L and decide according to selected column electrode simultaneously, decides according to column electrode packet count M and the parallel output terminal of selection signal parallel output device is several.Correspondingly, the size of each parallel output device can be done very for a short time.
In an embodiment of liquid crystal indicator of the present invention, select the signal parallel output device that M and line output are arranged, and the parallel output device of voltage signalization have L and line output.
In the present embodiment, the parallel output terminal number of the parallel output device of voltage signalization equals selected column electrode of while and counts L, and selects the parallel output terminal number of signal parallel output device to equal column electrode packet count M.Correspondingly, the size of each parallel output device can be done very for a short time.
In an embodiment of liquid crystal indicator of the present invention, the parallel output device of voltage signalization comprises a latch cicuit, this latch cicuit latchs column electrode option code type signal with latch pulse, latch pulse is synchronous with the switching timing time that the group that contains simultaneously selected column electrode is selected, and thus locked signal is outputed to liquid crystal display drive circuit.
In the present embodiment, when having selected the column electrode grouping, latch cicuit latchs the column electrode option code type that is applied in the column electrode grouping, and the column electrode option code type that latchs is offered liquid crystal display drive circuit.
In an embodiment of liquid crystal indicator of the present invention, the parallel output device of voltage signalization comprises a shift register, this shift register is shifted to a string column electrode option code type, and has tap output, is used for being connected of each grade and latch cicuit.
In the present embodiment, shift register is shifted to the column electrode option code type that serial connection forms, thereby the column electrode option code type that will be applied in the column electrode grouping is lockable latching in the timing time of latch cicuit.
In an embodiment of liquid crystal indicator of the present invention, select the signal parallel output device to comprise a shift register, this shift register selects the data of signal in active cycle length to be shifted with latch pulse to showing, latch pulse is synchronous with the switching timing time that the group that contains simultaneously selected column electrode is selected, and this shift register offers liquid crystal display drive circuit to each grade tap output as the selection signal of each group.
In the present embodiment, it is active to select the signal parallel output device that the output of dividing into groups corresponding to a column electrode is become, thereby after having selected the column electrode grouping, liquid crystal display drive circuit can select to be included in the column electrode in the column electrode grouping.
In an embodiment of liquid crystal indicator of the present invention, select the signal parallel output device to comprise and latch electrolysis, this latch cicuit latch pulse, the selection signal code shape that forms according to the selection signal that will offer liquid crystal display drive circuit is latched, latch pulse is synchronous with the switching timing time that the group that contains simultaneously selected column electrode is selected, and the selection signal code type that will latch thus exports liquid crystal display drive circuit to.
In the present embodiment, latch circuit latches makes column electrode divide group selection to become active information, and after having selected column electrode grouping, latchs to make another column electrode grouping become passive information, in view of the above the information that latchs is offered liquid crystal display drive circuit.
In an embodiment of liquid crystal indicator of the present invention, select the signal parallel output device to comprise a shift register, this shift register selects the data in active cycle of signal to be shifted with shift pulse to showing, the cycle of used shift pulse with one group is contained the group of selected line electrode is simultaneously selected and cycle of switching equates, and this shift register is exported the tap of each grade of register and is offered latch cicuit.
In the present embodiment, shift register is shifted one by one to selecting the signal code type, is latched the circuit pinning thereby make column electrode grouping to be selected be selected to active information in latching timing time.
In the accompanying drawing:
Fig. 1 is according to first kind of embodiment of the present invention, the block diagram of the row voltage generation circuits in the liquid crystal indicator;
Fig. 2 is the chronogram of each segment signal waveform among first kind of embodiment;
Fig. 3 is according to embodiment in of the present invention second, the block diagram of the row voltage generation circuits in the liquid crystal indicator;
Fig. 4 is the chronogram of a customary voltage among second kind of embodiment;
Fig. 5 is the chronogram of each segment signal waveform among second kind of embodiment;
Fig. 6 is according to the third embodiment of the present invention, the block diagram of the row voltage generation circuits in the liquid crystal indicator;
Fig. 7 is the chronogram of a customary voltage among the third embodiment;
Fig. 8 is the chronogram of each segment signal waveform among the third embodiment;
Fig. 9 (a) is according to the 4th kind of embodiment of the present invention, the block diagram of the row voltage generation circuits in the liquid crystal indicator;
Fig. 9 (b) is the chronogram of each segment signal waveform among the 4th kind of embodiment;
Figure 10 (a) is according to the 5th kind of embodiment of the present invention, the block diagram of the row voltage generation circuits in the liquid crystal indicator;
Figure 10 (b) is among the 5th kind of embodiment, the chronogram of each segment signal waveform;
Figure 11 is when L=3, the chronogram of a customary voltage;
L=4 work as in Figure 12 (a)-(c) expression, and 8 and k=4,8 o'clock, the situation of a selection voltage matrix.
Hereinafter the preferred embodiment of liquid crystal indicator of the present invention will be described in conjunction with above-mentioned accompanying drawing.
Fig. 1 is the block diagram according to the row voltage generation circuits in first kind of embodiment of the present invention, the liquid crystal indicator.
Shift register 1a has N level (N: all column electrode numbers).This shift register is according to the timing shifted data a of shift clock pulse (CP), and data a selects voltage vector, forms by each column electrode option code type of serial arrangement corresponding to each.One customary electrode option code type can be illustrated with reference to Figure 12.One by unit+1 and-1 matrix that constitutes in, column electrode option code type is that a kind of each with in the matrix is listed as the sign indicating number type of representing, for example with 0 unit-1 that comes in the substitution matrix.
Have bit width and be the output of each grade generation of the latch cicuit 2a latch shift register 1a of N position, and provide an output to each a input end of the liquid crystal display drive circuit 3 with N output terminal.
Shift register 1b has N level (N: all column electrode numbers).This shift register 1b is shifted to be active data b in the selection cycle of column electrode according to the timing of CP.
The latch cicuit 2b that has bit width and be a N position latchs the output by each grade generation of shift register 1b, and each output is offered each b input end of liquid crystal display drive circuit 3.That is, select the signal code type to offer liquid crystal display drive circuit 3 from latch cicuit 2b.N the tap output of latch cicuit 2a, 2b is corresponding with n column electrode.Voltage+Vr, O ,-Vr offers liquid crystal display drive circuit 3.Liquid crystal display drive circuit 3 according to the combination of input data a and b to row voltage is+Vr, O, still-state of Vr decisions making.
Although do not draw liquid crystal cell among Fig. 1, in fact liquid crystal cell links to each other with the output terminal of liquid crystal display drive circuit 3.Have a kind of situation to be, when simultaneously selecteed column electrode number was L, L was not corresponding with a value of being taken advantage of by L.In this case, liquid crystal display drive circuit 3 output O
n(n:1-N) contain a false output.One column voltage generation circuit (not drawing among the figure) is applied to the voltage that draws according to the orthogonal transformation signal on each row electrode.The orthogonal transformation signal is to use orthogonal function, carries out by the position of column electrode simultaneously selected on the display element, to picture intelligence that conversion obtains.For example, as mentioned above, between column electrode option code type and picture signal, carry out XOR, just can obtain the arithmetic sum of XOR corresponding to the row of this selected line electrode.Then, the column voltage that draws according to this arithmetic sum is applied on the row electrode.
In first kind of embodiment, the column electrode selecting arrangement is made of shift register 16 and latch cicuit 2b.The row voltage generation circuit is made of shift register 1a, latch cicuit 2a and liquid crystal display drive circuit 3.Latch cicuit 2b selects the signal parallel output device to draw in the drawings as an example, and latch cicuit 1a draws in the drawings as the parallel output device of a routine voltage signalization.
Hereinafter will make description, wherein L=3 to the operation of the liquid crystal indicator of first kind of embodiment.
Figure 11 represents column electrode R
nThe signal waveform of middle column electrode R1-R9.Suppose respectively to R1-R3 to be that one group, R4-R6 are that one group and R7-R9 are one group and select simultaneously.Each column electrode grouping comprises 3 column electrodes.In the present embodiment, when first column electrode grouping to M column electrode grouping is carried out single pass when (hereinafter being called a frame), just be provided with same column electrode option code type for each column electrode grouping.When scanning proceeds to predetermined frame number of times, just finished the DISPLAY ORDER of image.
As shown in Figure 2, offer latch cicuit 2a, 2b latch pulse cycle and select the cycle of each row voltage to equate.In the one-period of latch pulse, common property gives birth in this example of L(3) individual time clock.Data b has active section (a high level section) corresponding to select time.Corresponding to the data a of column electrode option code type, its active section corresponding with three clock cycles.
Data a is shifted in shift register 1a by time clock, and data b is shifted in shift register 1b by time clock.L time clock of each generation just produces a latch pulse.Latch cicuit 2a latchs each data in shift register 1a.Latch cicuit 2b latchs each data in shift register 1b.Latch cicuit 2a and N output is imported into corresponding a input end of liquid crystal display drive circuit 3.The N of latch cicuit 2b output is imported into corresponding b input end of liquid crystal display drive circuit 3.
Have four kinds of voltage V
0-V
3Be imported in the liquid crystal display drive circuit 3.For example, V
0Or V
2Expression 0, and V
1And V
3Respectively expression-Vr and+Vr.Liquid crystal display drive circuit 3 is made up of a level shifter a, analog switch etc.N a input and n b input are respectively corresponding to being applied to n the voltage on the column electrode.That is, when n b input was in low level, liquid crystal display drive circuit 3 makes and is applied to n the voltage on the column electrode was the voltage corresponding to a nonselection mode.When n b input was in high level, the voltage of importing polarity corresponding to n a was applied on n the column electrode.For example, when a input is in high level, just apply voltage+Vr.On the contrary, when a input is in low level, just apply voltage-Vr.
Above-mentioned relation can be explained with a truth table.That is, liquid crystal display drive circuit 3 is looked input (a, combination b) and deciding is from voltage V
0-V
3In select a value.For example, when (a, b)=(0,0), when (0,1), (1,0) or (1,1), select V0 respectively, V1, V2 or V3.Register 1a, 1b have the L level respectively, and when N time clock of input, all column electrodes are once selected.During the selection of column electrode, same column electrode option code type is applied to each column electrode grouping.Then, change column electrode option code type, that is, data a becomes the above-mentioned processing procedure of execution.For example, data a selects the selection circuit of a sign indicating number type by a table (having set multiple column electrode option code type in the table), at first in each cycle from column electrode option code type, and selected line electrode option code type is transformed into the P-S converter of serial signal constitutes.
In the present embodiment, to latch cicuit 2a, the fan-out factor of 2b is that the situation of N is described.Yet, can use other values except that N.For example, under the situation of N/2, can be divided into two independent parts to the single width display image and drive.
Have, above to latch cicuit 2a, 2b is described as the situation of parallel output device again.Yet, can use another kind of structure.For example, as shift register 1a, the progression of 1b is N * L, and ixL (i:1-N) tap output can be omitted latch cicuit 2a, 2b when offering liquid crystal display drive circuit 3.
Have, column electrode option code type and selection signal code type can be set at latch cicuit 2a, in the 2b, and do not use shift register 1a, 1b again.For example, the column electrode option code type that only makes the first column electrode active selection signal code type of grouping becoming and divide into groups corresponding to first column electrode, the column electrode option code type that only makes the second column electrode active option code type of grouping becoming and divide into groups corresponding to second column electrode, the column electrode option code that only makes M the column electrode active selection signal code type of grouping becoming and divide into groups corresponding to M column electrode can be stored in the ROM (read-only memory) (ROM), selects signal code type and column electrode option code type to read with the address signal that counting clock pulse obtains in the ROM (read-only memory).In this case, because time clock needn't have upper frequency, thereby can reduce power consumption.Have again, can determine to be used in the frame column electrode option code type of each column electrode grouping arbitrarily.
Second kind of embodiment of the present invention is discussed below.In first kind of embodiment, same column electrode option code type is applied to each column electrode grouping, until the end of scan of a frame.Yet, can change column electrode option code type in the frame.Fig. 3 is the block diagram of row voltage generation circuits among second kind of embodiment of the present invention.In second kind of embodiment, the frequency that offers the shift clock signal CPa of shift register 1a is higher than the frequency of the shift clock signal CPa that offers shift register 1b.Correspondingly, the column electrode option code type that can be provided with is used for current selected column electrode grouping, and this column electrode option code type is different from will that do electrode option code type set when having selected a column electrode grouping before a frame.
The operation of second kind of embodiment hereinafter will be discussed, here L=3.
As shown in Figure 4, in column electrode Rn, group R1-R3, group R4-R6, group R7-R9 etc. are all by those simultaneously selected groups.Each column electrode grouping comprises three column electrodes.In the present embodiment, the frequency of shift clock signal CPa is two times of frequency of shift clock signal CPb, as shown in Figure 5.In addition, in the one-period of latch pulse signal, produce L (being 3 among second kind of embodiment) shift clock signal CPb.
Shift register 1a, 1b, the ruuning situation of latch cicuit 2a, 2b and liquid crystal display drive circuit 3 is identical with situation among first kind of embodiment, different just string datas import one by one, thereby in liquid crystal display drive circuit 3 corresponding to m column electrode grouping, when each b input end provided a high level, the column electrode option code type that is applied to m column electrode grouping just appeared at each corresponding stage of this shift register 1a.
With the method that provides data a to satisfy above-mentioned condition, can determine to be used in the one-period column electrode option code type of each electrode grouping arbitrarily.For example, these data a can read circuit (being used for reading the data in the table) and a P-S converter is formed by a table (a string data parallel setting in the table).
The frequency of clock pulse signal CPa is not limited to two times of clock pulse signal CPb.That is, among second kind of embodiment, the relation between the frequency of the frequency of latch pulse LP, clock pulse signal CPa, CPb generally can be explained by following formula:
CPa/CPb=k, CPb/LP=L(k one are at least 2 integer)
Like this, when grouping was selected to a column electrode, column electrode option code type can be shifted once.
In second kind of embodiment, to latch cicuit 2a, the fan-out factor of 2b is that the situation of N is described.Yet, can use a value that is not N.For example, under the situation of N/2, the single width display image can be divided into two independent part and assign to drive.
In addition, also to latch cicuit 2a, 2b is described as the situation of parallel output device.But, can use another kind of structure.For example, can use to have N * the shift register 1a of L level, 1b and omit latch cicuit 2a, 2b, and n * L(n:1-N) individual tap output is provided for liquid crystal display drive circuit 3.
In addition, can column electrode option code type be set among the 2b and select the signal code type, and omit shift register 1a, 1b at latch cicuit 2a.
Fig. 6 is the block diagram of the row voltage generation circuits in the described liquid crystal indicator of the third embodiment of the present invention.Among Fig. 6, data a is shifted by the time clock that has in the L level shift register 11.The tap output of shift register 11 each grades is latched by the latch pulse of latch cicuit 12.Data b is shifted by the latch pulse with M level shift register 13.
The parallel output terminal of latch cicuit 12 is connected to N a input end of liquid crystal display drive circuit 3.For example, individual (i:1-N) output terminal of the i of latch cicuit 12 is connected to i, L+i is individual, 2L+i is individual ... (M-1) L+i a input end.On the other hand, m(m:1-M) a level output terminal is connected to (J-1) L jL b input end, promptly is connected to M input end, N=L * M here.
In the third embodiment, the column electrode selecting arrangement is made of shift register 13.The row voltage generation circuit is made of shift register 11, latch cicuit 12 and liquid crystal display drive circuit 3.Shift register 13 is expressed as an example and selects the signal parallel output unit, and latch cicuit 12 is expressed as a routine voltage signalization and a running output device.
Below with reference to the chronogram among Fig. 8 the operation of the third embodiment, wherein L=7 are described.The data a of input obtains with composing in series single column electrode option code type.The data that shift register 11 is shifted one by one and is transfused to by time clock.On the other hand, can only select the data of L column electrode to import as data b.
When producing a latch pulse, latch cicuit 12 takes out these data in shift register 11.Because in the end produced 7 time clock between a latch pulse and the current latch pulse, single column electrode option code type is set in the shift register 11.Correspondingly, the data that obtained with serial connection formation column electrode option code type are imported into first in the liquid crystal display drive circuit 3 to the 7th a input end, the 8th to the 14 a input end ... and (N-6) is to N a input end.On the other hand, latch pulse of shift register 13 usefulness takes out data b, and this content is moved 1.For example, when the first order at shift register 13 was provided with a high level, this high level was provided for first to the 7th b input end of liquid crystal display drive circuit 3.That is, send instructions, thereby make first column electrode grouping that comprises first to the 7th column electrode become active to this liquid crystal display drive circuit 3.Liquid crystal display drive circuit 3 according to the polarity of the data that are input to first to the 7th a input end voltage (+Vr or-Vr) be applied on first to the 7th column electrode.With the same method among first and second kinds of embodiment, liquid crystal display drive circuit 3 is handled according to truth table.
In the select time of each column electrode, the shift register setting will be used for the column electrode option code type in the next column electrode grouping.When producing a latch pulse, to first to the 7th a input end, the 8th to the 14 a input end ..., (N-6) carries out a yard type setting to N a input end.On the other hand, a latch pulse shifted data of shift register 13 usefulness content, and correspondingly produces a high level to the next stage of that one-level that high level was provided last time.
Correspondingly, the condition of b input end can come to determine like this, makes and can the next column electrode grouping of selecteed that grouping of last time be made one's options.For example, liquid crystal display drive circuit 3 according to the data polarity that is input to the 8th to the 14 a input end voltage (+Vr or-Vr) be applied in the column electrode grouping that comprises the 8th to the 14 column electrode.
Like this, according to column electrode option code type voltage is applied on the column electrode of forming each column electrode grouping.In this case, different with the column electrode option code type that is used for column electrode grouping another yard types can be set up the column electrode grouping that will select as next.Certainly, can use same sign indicating number type.
For example, data a can by a table (having column electrode option code type in the table), select circuit (being used for from table, selecting one yard type) and-the P-S converter forms.Data can need not the P-S conversion and be set directly in the latch cicuit 12.In this case, can omit shift register 11.In addition, because time clock needn't have upper frequency, can reduce power consumption.
In such an embodiment, select the signal parallel output device to constitute by shift register 13.Yet, can use one to latch the latch cicuit of selecting the signal code type by latch pulse.In this case, can connect a shift register in the prime of latch cicuit.Employed shift register 13 has same function in this shift register and the present embodiment.Like this, the phase place that offers the shift pulse of this shift register can be from the phase deviation of latch pulse, thereby reduced noise effectively.
In addition, the row voltage generation circuits of present embodiment can be included in the lcd controller circuit that prime connected of driver.
The 4th kind of embodiment of the present invention is described below.Have a kind of situation to be, the column electrode number of the display screen of being made up of liquid crystal display cells is greater than N.In this case, the number of electrodes that drive can increase with a plurality of row voltage generation circuits, as Fig. 3 or shown in Figure 6.A kind of embodiment of Fig. 9 (a) expression one row voltage generation circuits has used the row voltage generation circuits among two Fig. 1, Fig. 3 or Fig. 6 among this embodiment.Under the situation of using the row voltage generation circuits described in Fig. 3, use time clock CPa, CPb is as input, and replaced time clock CP.The routine output waveform that Fig. 9 (b) describes, electrode drive waveform at once, wherein: L=3.
Data a, shift clock pulse (CP or CPa, CPb) and latch pulse LP be imported into two row voltage generation circuits 5a, 5b usually.One selects the signal code type to be imported into the shift register 1b of row voltage generation circuits 5a or 13(referring to Fig. 1 as data b, Fig. 3 or Fig. 6).The output of shift register data b is provided for the input of the data b of row voltage generation circuits 56.
Have this syndeton, make the row voltage generation circuits of present embodiment can be with the same manner operation of described embodiment above, and, can drive the column electrode number greater than N but less than the display screen of 2N.As a same reason, when three or more row voltage generation circuits of serial connection, can further increase the column electrode number of driving.Waiting the column electrode number of choosing like this, simultaneously is L.
The 5th kind of embodiment of the present invention hereinafter described.Can use as Fig. 1, Fig. 3 or a plurality of row voltage generation circuits shown in Figure 6 increase column electrode number simultaneously to be selected.What Figure 10 (a) described is that an example is used as Fig. 1, and Fig. 3 or two row voltage generation circuits shown in Figure 6 increase the structure of column electrode number simultaneously to be selected.When using row voltage generation circuits shown in Figure 3, use clock pulse signal CPa, CPb replaces time clock CP as input.Figure 10 (b) represents a routine output waveform, electrode drive waveform, wherein L=3 at once.
Data b, shift clock pulse (CP or CPa, CPb) and latch pulse (LP) be imported into two row voltage generation circuits 5c, 5d usually.Be input in the row voltage generation circuits 5c is column electrode option code type as data a.Be input in other row voltage generation circuits 5d is another different column electrode option code type as data a '.The input of data a can be identical with the input of data a '.
Structure with above-mentioned connection can obtain the operation identical with the ruuning situation of the foregoing description, can drive this display screen, and have 2L column electrode to be selected simultaneously.As a same reason, when two of uses or more a plurality of row voltage generation circuits, can be to 3L, 4L ... individual column electrode is selected simultaneously.
As mentioned above, according to the present invention, liquid crystal indicator comprise one one by one to each simultaneously selected line electrode carry out the column electrode selecting arrangement of addressing and a usefulness column electrode selecting arrangement, voltage be applied to the capable voltage generation circuit of each selected line electrode according to the corresponding data in the column electrode option code type signal.Correspondingly, with selecting the way of L column electrode to drive under the situation of liquid crystal indicator simultaneously, compare with controlling the situation that is applied to the polarity of voltage on every N column electrode respectively, the column electrode driving circuit can have simpler structure.
In addition, liquid crystal indicator of the present invention is constructed, make it comprise a row voltage generation circuits, can easily be provided for L the desired voltage sign indicating number of selected line electrode type simultaneously.Described row voltage generation circuits comprises column electrode sign indicating number type setting device and delegation's electrod driving device.Column electrode sign indicating number type setting device is used for exporting the column electrode option code type signal that is applied to each selected line electrode relevant voltage.The column electrode drive unit is used on each column electrode that is applied to based on the voltage by the definite sign indicating number type of column electrode sign indicating number type setting device by the addressing of column electrode selecting arrangement.
In addition, liquid crystal indicator is constructed, make it comprise one and select signal parallel output unit and a voltage signalization and a running output device, thereby make liquid crystal display drive circuit can easily be identified for the voltage sign indicating number type of each column electrode to be selected and other each column electrodes.Described selection signal parallel output unit makes the selection signal corresponding to the selected line electrode become active signal, makes the selection signal corresponding to other column electrodes except that selecting column electrode become non-active signal, selecting signal to offer liquid crystal display drive circuit.Described voltage signalization and running output device are offering liquid crystal display drive circuit corresponding to the corresponding data in the column electrode option code type signal of each column electrode to be selected as the voltage signalization.
When the parallel output terminal number of the selection signal parallel output device in the liquid crystal indicator equates with the parallel output terminal number of the parallel output device of voltage signalization, just can simplify the structure of selecting column electrode simultaneously.
When the parallel output terminal number of the parallel output terminal number of selecting the signal parallel output device and the parallel output device of voltage signalization equates with column electrode sum N, then can simplify the structure of selecting column electrode simultaneously.
Liquid crystal indicator is constructed, make it comprise two latch cicuits, thereby the column electrode option code type that is used for each column electrode to be selected and other each column electrodes necessarily can offer liquid crystal display drive circuit.Described two latch cicuits, a circuit latch selecting the signal code type according to the selection signal that offers liquid crystal display drive circuit, thereby being outputed to liquid crystal display drive circuit by the code-locked type; Another circuit latchs column electrode sign indicating number type signal, thereby locked signal is exported to liquid crystal display drive circuit.
Liquid crystal indicator is constructed, make it comprise two shift registers: a shift register is used to be shifted and represents to select interior data of active cycle of signal, another shift register a string column electrode option code type that is used to be shifted, thus make the data that provide in input time, have less bit width.Said structure can reduce the input pin of driver.
Liquid crystal indicator is constructed, the shift clock frequency that offers the shift register in the parallel output device of voltage signalization is higher than offers the shift clock frequency of selecting the shift register in the signal parallel output device, be used to form the different voltage sign indicating number type of the row electrode voltage sign indicating number type of column electrode grouping with another and can easily be applied to the column electrode that constitutes next column electrode grouping to be selected thereby make.
Liquid crystal indicator is constructed, make it comprise a parallel output device of a voltage signalization and a selection signal parallel output device, thereby can form desired voltage sign indicating number type, and its structure is simplified more for L selected column electrode of while.The also line output number of the parallel output device of described voltage signalization is the natural several times of while selected line number of electrodes L, and selecting the also line output number of signal parallel output device is the natural several times of column electrode packet count M.In addition, can also drive multiple image.
Liquid crystal indicator is constructed, make it comprise a parallel output device of a voltage signalization and a selection signal parallel output device, thereby can form desired voltage sign indicating number type, and structure is simpler for L selected column electrode of while.Wherein, the also line output number of the parallel output device of described voltage signalization equals selected line number of electrodes L simultaneously, and the also line output number of described selection signal parallel output device equals column electrode packet count M.
Liquid crystal indicator is constructed, make it comprise a latch cicuit, the described electricity that latchs latchs column electrode sign indicating number type signal with latch pulse, described latch pulse and selection and switching are synchronous by the timing time of the group that while selected line electrode is formed, and latch cicuit exports locked signal to liquid crystal display drive circuit, thereby the column electrode option code type that is used in the column electrode grouping can be provided for liquid crystal display drive circuit certainly.
Liquid crystal indicator is constructed, make it comprise a shift register, this shift register a string column electrode option code type that is used to be shifted, thus the noise that can reduce liquid crystal display cells is provided with the influence that device produces to column electrode option code type.
Liquid crystal indicator is constructed, make it comprise a shift register, this shift register selects the data in active cycle of signal to be shifted with latch pulse to representing, and by the lock data offer liquid crystal display drive circuit, thereby the noise that can reduce liquid crystal cell is provided with the influence that device produces to column electrode option code type.
Liquid crystal indicator is constructed, make it comprise a latch cicuit, this latch cicuit latchs with latch pulse and selects the signal code type, and locked signal sign indicating number type is exported to liquid crystal display drive circuit, thereby makes the information of expression column electrode grouping to be selected be provided for liquid crystal display drive circuit certainly.
In addition, liquid crystal indicator is constructed, make it comprise a shift register, this shift register selects the data in active cycle of signal to be shifted to expression, and the data that have been shifted are offered latch cicuit, thereby the noise that can reduce liquid crystal display cells is set the influence that device produces of being provided with of sign indicating number type to column electrode.
Claims (13)
1, a kind of liquid crystal indicator, it comprises:
A kind of liquid crystal cell that drives with the method that drives a plurality of column electrodes and row electrode and a plurality of column electrodes are selected simultaneously,
A kind ofly according to the orthogonal transformation signal voltage is put on the column voltage generation circuit of each row electrode, described quadrature transformation signal is to use orthogonal function, and the picture signal of selected line electrode position carries out that conversion obtains to corresponding to display element the time, and
The column electrode option code type signal that a kind of basis is made up of orthogonal function, voltage is imposed on the row voltage generation circuits of simultaneously selected column electrode, it is characterized in that,
Row voltage generation circuits comprises:
Delegation's electrode selection device is used for each while selected line electrode is carried out sequential addressing, and
Delegation's voltage generation circuit is used for the voltage in response to column electrode option code type signal corresponding data is applied to each column electrode of being selected by the column electrode selecting arrangement.
2, liquid crystal indicator as claimed in claim 1, it is characterized in that, described capable voltage generation circuit comprises column electrode option code type setting device and delegation's electrod driving device, the former is used for exporting the column electrode option code type signal corresponding to being applied to the voltage on each column electrode to be selected, and the latter is in response to by the sign indicating number type of column electrode option code type setup means sets voltage being applied on each column electrode by the addressing of column electrode selecting arrangement institute.
3, liquid crystal indicator as claimed in claim 2 is characterized in that, described column electrode drive unit comprises a liquid crystal display drive circuit, and described liquid crystal display drive circuit receives N(N: the individual selection signal column electrode sum), and each selects signal corresponding with each column electrode; Described liquid crystal display drive circuit receives N voltage signalization, and each voltage signalization is corresponding to each column electrode; Described liquid crystal display drive circuit is applied to the capable voltage corresponding to the voltage signalization by on the determined column electrode of selection signal,
Described column electrode selecting arrangement comprises that one selects the signal parallel output unit, described selection signal parallel output unit becomes each the selection signal corresponding to each selected line electrode active, become each the selection signal corresponding to each non-selected line electrode non-active, select each signal to offer liquid crystal display drive circuit thus, and
Described column electrode option code type setting device comprises the voltage signalization output device that walks abreast, the parallel output device of described voltage signalization is as to the voltage signalization, offering liquid crystal display drive circuit corresponding to the corresponding data in the column electrode option code type signal of each selected line electrode.
4, liquid crystal indicator as claimed in claim 3 is characterized in that, the parallel output terminal number of described selection signal parallel output device equals the parallel output terminal number of the parallel output device of voltage signalization.
5, liquid crystal indicator as claimed in claim 4 is characterized in that, the parallel output terminal number of the parallel output device of the parallel output terminal number of described selection signal parallel output device and voltage signalization equals column electrode sum N.
6, liquid crystal indicator as claimed in claim 4, it is characterized in that, described selection signal parallel output device comprises a latch cicuit, described latch cicuit is according to the selection signal that will offer liquid crystal display drive circuit, latch option code type signal with latch pulse, described latch pulse and the group that is made of while selected line electrode select the timing time that switches synchronous, selected the signal code type to output to liquid crystal display drive circuit locking thus, and
The parallel output device of described voltage signalization comprises a latch cicuit, and described latch cicuit latchs column electrode option code type signal with latch pulse, and locked signal is outputed to liquid crystal display drive circuit.
7, liquid crystal indicator as claimed in claim 6, it is characterized in that, described selection signal parallel output unit comprises a shift register, described shift register selects the data in the active cycle of signal to be shifted to expression, and has tap output, be used for each level is linked to each other with latch cicuit, and
The parallel output device of described voltage signalization comprises a shift register, and described shift register is shifted to a string column electrode option code type, and has tap output, is used for each level is linked to each other with latch cicuit.
8, liquid crystal indicator as claimed in claim 7, it is characterized in that the described shift clock frequency that offers the shift register of the parallel output device of voltage signalization is higher than the shift clock frequency that offers the shift register of selecting the signal parallel output device.
9, liquid crystal indicator as claimed in claim 3 is characterized in that, the parallel output terminal number of described selection signal parallel output device is a natural number of being taken advantage of by M, and wherein M is the group number of selected line electrode simultaneously, and
The parallel output terminal number of the parallel output device of described voltage signalization is a natural number of being taken advantage of by L, and wherein L is for forming the column electrode number of each group.
10, liquid crystal indicator as claimed in claim 9 is characterized in that, described selection signal parallel output device has M parallel output terminal, and wherein M is the group number of formation while selected line electrode, and
The parallel output device of described voltage signalization has L parallel output terminal, and wherein L is for forming the column electrode number of each group.
11, liquid crystal indicator as claimed in claim 9, it is characterized in that, the parallel follower of described voltage signalization comprises a latch cicuit, described latch cicuit latchs column electrode option code type signal with latch pulse, described latch pulse is synchronous with the timing time that constitutes the selection switching of selected line electrode group simultaneously, thus locked signal is outputed to described liquid crystal display drive circuit.
12, liquid crystal indicator as claimed in claim 11, it is characterized in that the parallel output device of described voltage signalization comprises a shift register, described shift register is shifted to a string column electrode option code type, and have tap output, be used for each level is linked to each other with latch cicuit.
13, liquid crystal indicator as claimed in claim 9, it is characterized in that, described selection signal parallel output device comprises a shift register, described shift register selects the data in active cycle of signal to be shifted with latch pulse to representing, described latch pulse is synchronous with the timing time that constitutes the selection switching of selected line electrode group simultaneously, and described shift register is as the selection signal of each group, has tap output, is used for being connected of each grade and described liquid crystal display drive circuit.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP89275/1993 | 1993-03-24 | ||
| JP8926893 | 1993-03-24 | ||
| JP89268/1993 | 1993-03-24 | ||
| JP8927593 | 1993-03-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1093176A true CN1093176A (en) | 1994-10-05 |
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ID=26430696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94103208A Pending CN1093176A (en) | 1993-03-24 | 1994-03-24 | Liquid crystal indicator |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0617399B1 (en) |
| KR (1) | KR940022149A (en) |
| CN (1) | CN1093176A (en) |
| DE (1) | DE69412677T2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1127716C (en) * | 1996-06-07 | 2003-11-12 | Lg半导体株式会社 | Driver circuit for thin film transistor-liquid crystal display |
| WO2008040235A1 (en) * | 2006-09-20 | 2008-04-10 | Byd Company Limited | A drive method and a column-decoding circuit and a driving circuit for a liquid display panel |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5621425A (en) * | 1992-12-24 | 1997-04-15 | Seiko Instruments Inc. | Liquid crystal display device |
| US6037919A (en) * | 1994-10-18 | 2000-03-14 | Intermec Ip Corp. | LCD with variable refresh rate as a function of information per line |
| JP3538841B2 (en) | 1994-11-17 | 2004-06-14 | セイコーエプソン株式会社 | Display device and electronic equipment |
| JPH08179731A (en) * | 1994-12-26 | 1996-07-12 | Hitachi Ltd | Data driver, scanning driver, liquid crystal display device and its driving method |
| JP3509398B2 (en) * | 1996-06-28 | 2004-03-22 | 富士通株式会社 | Image display method and apparatus |
| JP2002123208A (en) | 2000-10-13 | 2002-04-26 | Nec Corp | Picture display device and its driving method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5485173A (en) * | 1991-04-01 | 1996-01-16 | In Focus Systems, Inc. | LCD addressing system and method |
| EP0522510B1 (en) * | 1991-07-08 | 1996-10-02 | Asahi Glass Company Ltd. | Driving method of driving a liquid crystal display element |
| JP3373226B2 (en) * | 1991-07-08 | 2003-02-04 | 旭硝子株式会社 | Driving method of liquid crystal display element |
-
1994
- 1994-03-23 KR KR1019940005887A patent/KR940022149A/en active IP Right Grant
- 1994-03-24 CN CN94103208A patent/CN1093176A/en active Pending
- 1994-03-24 EP EP94104742A patent/EP0617399B1/en not_active Expired - Lifetime
- 1994-03-24 DE DE69412677T patent/DE69412677T2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1127716C (en) * | 1996-06-07 | 2003-11-12 | Lg半导体株式会社 | Driver circuit for thin film transistor-liquid crystal display |
| WO2008040235A1 (en) * | 2006-09-20 | 2008-04-10 | Byd Company Limited | A drive method and a column-decoding circuit and a driving circuit for a liquid display panel |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69412677D1 (en) | 1998-10-01 |
| DE69412677T2 (en) | 1999-02-11 |
| EP0617399B1 (en) | 1998-08-26 |
| KR940022149A (en) | 1994-10-20 |
| EP0617399A1 (en) | 1994-09-28 |
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