IT9067501A1 - PILOTING SIGNAL CIRCUIT FOR DISPLAY - Google Patents
PILOTING SIGNAL CIRCUIT FOR DISPLAY Download PDFInfo
- Publication number
- IT9067501A1 IT9067501A1 IT067501A IT6750190A IT9067501A1 IT 9067501 A1 IT9067501 A1 IT 9067501A1 IT 067501 A IT067501 A IT 067501A IT 6750190 A IT6750190 A IT 6750190A IT 9067501 A1 IT9067501 A1 IT 9067501A1
- Authority
- IT
- Italy
- Prior art keywords
- generator
- display
- signal
- element matrix
- matrix display
- Prior art date
Links
- 239000011159 matrix material Substances 0.000 claims description 11
- 230000006870 function Effects 0.000 claims 1
- 239000013078 crystal Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- 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
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
- G09G3/3651—Control of matrices with row and column drivers using an active matrix using multistable liquid crystals, e.g. ferroelectric liquid crystals
-
- 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
- G09G3/3629—Control of matrices with row and column drivers using a passive matrix using liquid crystals having memory effects, e.g. ferroelectric liquid crystals
-
- 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
- G09G2310/06—Details of flat display driving waveforms
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Liquid Crystal (AREA)
- Selective Calling Equipment (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
- Oscillators With Electromechanical Resonators (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Liquid Crystal Display Device Control (AREA)
- Electric Clocks (AREA)
Description
Descrizione dell'invenzione industriale dal titolo: Description of the industrial invention entitled:
"CIRCUITO GENERATORE DI SEGNALI DI PILOTAGGIO PER DISPLAY" "GENERATOR CIRCUIT OF PILOTING SIGNALS FOR DISPLAY"
R I A S S U N T O SUMMARY
La presente invenzione si riferisce ad un generatore di segnali di pilotaggio per un display a matrice di elementi, particolarmente un display ad elementi ferroelettrici; la caratteristica principale dell'invenzione consiste nel fatto che il generatore comprende una memoria digitale per una molteplicità di segnali atti a ricostruire un segnale di pilotaggio con forma predeterminata ed un dispositivo di selezione di detti segnali. The present invention relates to a driving signal generator for an element matrix display, particularly a ferroelectric element display; the main feature of the invention consists in the fact that the generator comprises a digital memory for a plurality of signals suitable for reconstructing a driving signal with a predetermined shape and a device for selecting said signals.
D E S C R I Z I O N E DESCRIPTION
La presente invenzione si riferisce ad un generatore di segnali di pilotaggio per un display a matrice di elementi, particolarmente un display impiegante elementi di tipo ferroelettrico. The present invention relates to a driving signal generator for an element matrix display, particularly a display employing elements of the ferroelectric type.
I display a base di cristalli ferroelettrici presentano caratteristiche interessanti, come risoluzione elevata e memoria (sono infatti elementi di tipo bistabile) Displays based on ferroelectric crystals have interesting characteristics, such as high resolution and memory (they are in fact bistable elements)
Il pilotaggio di tali tipi di display presenta tuttavia alcuni problemi; occorre infatti tener presente che i cristalli ferroelettrici rappresentano un particolare stato di cristalli liquidi, ottenuto con lavorazioni particolari; le caratteristiche del segnale di pilotaggio relativo devono essere fortemente correlate alla struttura dei cristalli stessi; la forma dei segnali deve essere di tipo complesso e inoltre le caratteristiche stesse variano generalmente con il variare della temperatura. However, driving these types of displays presents some problems; in fact, it is necessary to bear in mind that ferroelectric crystals represent a particular state of liquid crystals, obtained with particular processes; the characteristics of the relative driving signal must be strongly correlated to the structure of the crystals themselves; the shape of the signals must be of a complex type and furthermore the characteristics themselves generally vary with the variation of the temperature.
Scopo della presente invenzione è quindi quello di indicare un generatore di segnali di pilotaggio per un display a matrice di elementi, particolarmente del tipo a cristalli ferroelettrici, che sia semplice e flessibile, cioè facilmente modificabile. The object of the present invention is therefore to indicate a generator of driving signals for an element matrix display, particularly of the ferroelectric crystal type, which is simple and flexible, that is, easily modifiable.
Un ulteriore scopo dell'invenzione è quello di indicare un generatore di segnali di pilotaggio per un display che consenta facilmente di essere compensato in temperatura. A further object of the invention is to indicate a driving signal generator for a display which easily allows it to be compensated for temperature.
Per conseguire tale scopo la presente invenzione ha per oggetto un generatore di segnali di pilotaggio per display a matrice di elementi, particolarmente un display ad elementi ferroelettrici, caratterizzato dal fatto che il generatore comprende una memoria digitale per una molteplicità di segnali atti a ricostruire un segnale di pilotaggio con forma predeterminata ed un dispositivo di selezione di detti segnali. To achieve this purpose, the present invention relates to a generator of driving signals for display with a matrix of elements, particularly a display with ferroelectric elements, characterized in that the generator comprises a digital memory for a multiplicity of signals suitable for reconstructing a signal control unit with predetermined shape and a device for selecting said signals.
Ulteriori scopi e vantaggi della presente invenzione risulteranno chiari dalla descrizione particolareggiata che segue e dai disegni annessi, forniti a puro titolo di esempio esplicativo e non limitativo, in cui: Further objects and advantages of the present invention will become clear from the detailed description that follows and from the attached drawings, provided purely by way of non-limiting example, in which:
- la figura 1 rappresenta un esempio di segnale di pilotaggio producibile con il generatore di segnali secondo l’invenzione; - la figura 2 rappresenta lo schema a blocchi del generatore di segnali secondo l'invenzione; - Figure 1 represents an example of a driving signal that can be produced with the signal generator according to the invention; Figure 2 represents the block diagram of the signal generator according to the invention;
- la figura 3 rappresenta lo schema di principio di un sistema di compensazione per la temperatura del generatore secondo l 'invenzione. - figure 3 represents the basic diagram of a compensation system for the temperature of the generator according to the invention.
Nella figura 1, è rappresentato un esempio di segnale di pilotaggio producibile con il generatore di segnali secondo l'invenzione. Tale segnale ha per base una sinusoide fondamentale, alla quale sono sovrapposte ondulazioni di maggior frequenza e minore ampiezza. In una realizzazione preferita della presente invenzione, il detto segnale di pilotaggio presenta una ampiezza di 2 x 48 volt e un periodo di 38 microsecondi, ed una frequenza fondamentale di 100 Khz; come si vede la pendenza varia; il tratto di pendenza massima dura 5 microsecondi. Figure 1 shows an example of a driving signal that can be produced with the signal generator according to the invention. This signal has as its base a fundamental sinusoid, on which undulations of higher frequency and lower amplitude are superimposed. In a preferred embodiment of the present invention, said driving signal has an amplitude of 2 x 48 volts and a period of 38 microseconds, and a fundamental frequency of 100 Khz; as you can see the slope varies; the stretch of maximum slope lasts 5 microseconds.
La forma del segnale rappresentato in figura 1 è una forma tipica, adatta per il pilotaggio delle varie righe del display; tuttavia il tipo di forma e la frequenza ottimali possono variare, come già detto; per questo motivo serve un generatore flessibile ed adattabile facilmente ad eventuali variazioni. The shape of the signal represented in Figure 1 is a typical shape, suitable for driving the various lines of the display; however the type of shape and the optimal frequency can vary, as already said; for this reason we need a flexible generator that can be easily adapted to any variations.
L'originalità della soluzione consiste nell'aver previsto dei mezzi per ottenere una sintesi digitale del segnale così fatto, che permette un adattamento semplice e veloce del segnale alle varie esigenze. The originality of the solution consists in having provided means for obtaining a digital synthesis of the signal thus made, which allows a simple and fast adaptation of the signal to the various needs.
La figura 2 rappresenta schematicamente un generatore di segnali secondo l'invenzione. Figure 2 schematically represents a signal generator according to the invention.
Con il riferimento C è indicato un contatore; esso fornisce alla memoria R (preferibilmente del tipo ROM o EPROM) gli indirizzi crescenti (per esempio da 0 a N-l); il contatore C è naturalmente pilotato da un generatore di clock CK. Reference C indicates a counter; it supplies the memory R (preferably of the ROM or EPROM type) with increasing addresses (for example from 0 to N-1); the counter C is naturally driven by a clock generator CK.
La memoria R fornisce in uscita i segnali atti a ricostruire la forma d’onda di pilotaggio desiderata ad un convertitore digitale/analogico D, che a sua volta pilota un amplificatore Al, all'uscita del quale è disponibile il segnale OUT di pilotaggio per il display. The memory R outputs the signals suitable for reconstructing the desired driving waveform to a digital / analog converter D, which in turn drives an amplifier A1, at the output of which the driving signal OUT is available for the display.
Viene qui riportato un esempio di calcolo dei parametri: Here is an example of parameter calculation:
periodo segnale 38 microsecondi; signal period 38 microseconds;
ampiezza segnale 48 volt; signal amplitude 48 volts;
numero campioni N=256. number of samples N = 256.
Risulta: It turns out:
frequenza clock: N/38 = 6,73 Mhz; clock frequency: N / 38 = 6.73 Mhz;
variazione ampiezza segnale: 96/256 = 0,375 volt; signal amplitude variation: 96/256 = 0.375 volts;
variazione percentuale: 0,375/96 = 0,39%; percentage variation: 0.375 / 96 = 0.39%;
unità temporale: 38/256 = 148 nanosecondi. time unit: 38/256 = 148 nanoseconds.
Un numero di 256 campioni, presi in relazione all'ampiezza ed alla frequenza del segnale da riprodurre, è soddisfacente; se necessario può essere scelto un numero maggiore. A number of 256 samples, taken in relation to the amplitude and frequency of the signal to be reproduced, is satisfactory; if necessary a higher number can be chosen.
Poiché gli studi sul materiale ferroelettrico rivelano una dipendenza dalla temperatura del comportamento dello stesso, si rende necessaria una compensazione; questa può essere facilmente ottenuta modificando la frequenza del segnale così, generato, e più precisamente asservendo la frequenza alla variazione di temperatura. Since the studies on the ferroelectric material reveal a dependence on the temperature of the behavior of the same, a compensation is necessary; this can be easily obtained by modifying the frequency of the signal thus generated, and more precisely by enslaving the frequency to the temperature variation.
La figura 3 rappresenta schematicamente il circuito di asservimento . Figure 3 schematically represents the interlocking circuit.
Il riferimento S indica un sensore di temperatura posto nel display; esso controlla, tramite un amplificatore A2, un oscillatore 0, del tipo a controllo di tensione (V.C.O.), il quale varia la sua frequenza con il variare della temperatura, ad esempio se la temperatura aumenta, aumenta anche la frequenza dell 'oscillatore viceversa. Il segnale generato dall'oscillatore 0, amplificato da un amplificatore A3, fornisce il segnale di clock per il generatore. Reference S indicates a temperature sensor placed on the display; it controls, through an amplifier A2, an oscillator 0, of the voltage control type (VCO), which varies its frequency with the variation of the temperature, for example if the temperature increases, the frequency of the oscillator also increases vice versa. The signal generated by oscillator 0, amplified by an amplifier A3, provides the clock signal for the generator.
Le caratteristiche del dispositivo descritto risultano chiare dalla descrizione effettuata e dai disegni annessi. The characteristics of the described device are clear from the description given and from the attached drawings.
Dalla descrizione effettuata risultano pure chiari i vantaggi del generatore di segnali oggetto della presente invenzione. From the above description the advantages of the signal generator object of the present invention are also clear.
In particolare essi sono rappresentati dal fatto che esso consente di generare in modo semplice segnali di pilotaggio di forma facilmente variabile modificando i dati contenuti nella memoria R e automaticament compensata per le variazioni di temperatura. In particular they are represented by the fact that it allows to generate in a simple way driving signals of easily variable shape by modifying the data contained in the memory R and automatically compensated for the temperature variations.
E' chiaro che numerose varianti sono apportabili dall'uomo dell'arte, ai dispositivi descritti come esempio, senza per questo uscire dall'ambito dei principi di novità insiti nell'invenzione. It is clear that numerous variants can be made by the man skilled in the art, to the devices described as an example, without thereby departing from the scope of the novelty principles inherent in the invention.
Claims (7)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT67501A IT1240381B (en) | 1990-07-06 | 1990-07-06 | PILOTING SIGNAL CIRCUIT FOR DISPLAY |
EP91111067A EP0464807B1 (en) | 1990-07-06 | 1991-07-04 | Circuit generating driving signals for display |
ES91111067T ES2081394T3 (en) | 1990-07-06 | 1991-07-04 | EXCITATOR SIGNAL GENERATOR CIRCUIT FOR DISPLAY. |
DE69113879T DE69113879T2 (en) | 1990-07-06 | 1991-07-04 | Circuit arrangement for generating display driver signals. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT67501A IT1240381B (en) | 1990-07-06 | 1990-07-06 | PILOTING SIGNAL CIRCUIT FOR DISPLAY |
Publications (3)
Publication Number | Publication Date |
---|---|
IT9067501A0 IT9067501A0 (en) | 1990-07-06 |
IT9067501A1 true IT9067501A1 (en) | 1992-01-06 |
IT1240381B IT1240381B (en) | 1993-12-10 |
Family
ID=11302951
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT67501A IT1240381B (en) | 1990-07-06 | 1990-07-06 | PILOTING SIGNAL CIRCUIT FOR DISPLAY |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0464807B1 (en) |
DE (1) | DE69113879T2 (en) |
ES (1) | ES2081394T3 (en) |
IT (1) | IT1240381B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2313224A (en) | 1996-05-17 | 1997-11-19 | Sharp Kk | Ferroelectric liquid crystal device |
GB2313223A (en) * | 1996-05-17 | 1997-11-19 | Sharp Kk | Liquid crystal device |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4414544A (en) * | 1981-06-12 | 1983-11-08 | Interstate Electronics Corp. | Constant data rate brightness control for an AC plasma panel |
US4622549A (en) * | 1983-06-29 | 1986-11-11 | International Business Machines Corporation | Repetition rate compensation and mixing in a plasma panel |
US4819186A (en) * | 1987-01-30 | 1989-04-04 | Casio Computer Co., Ltd. | Waveform generating apparatus for driving liquid crystal device |
GB2207272B (en) * | 1987-07-18 | 1991-08-14 | Stc Plc | Addressing liquid crystal cells |
JPH0310217A (en) * | 1989-06-07 | 1991-01-17 | Seiko Epson Corp | Method for driving liquid crystal device |
JPH0331817A (en) * | 1989-06-29 | 1991-02-12 | Seiko Epson Corp | Driving method for liquid crystal device |
-
1990
- 1990-07-06 IT IT67501A patent/IT1240381B/en active IP Right Grant
-
1991
- 1991-07-04 EP EP91111067A patent/EP0464807B1/en not_active Expired - Lifetime
- 1991-07-04 DE DE69113879T patent/DE69113879T2/en not_active Expired - Fee Related
- 1991-07-04 ES ES91111067T patent/ES2081394T3/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69113879T2 (en) | 1996-04-11 |
EP0464807B1 (en) | 1995-10-18 |
IT1240381B (en) | 1993-12-10 |
DE69113879D1 (en) | 1995-11-23 |
IT9067501A0 (en) | 1990-07-06 |
EP0464807A3 (en) | 1992-07-01 |
EP0464807A2 (en) | 1992-01-08 |
ES2081394T3 (en) | 1996-03-01 |
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