EP0464620B1 - Bildinformationssteuergerät und Anzeigesystem - Google Patents

Bildinformationssteuergerät und Anzeigesystem Download PDF

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Publication number
EP0464620B1
EP0464620B1 EP91110530A EP91110530A EP0464620B1 EP 0464620 B1 EP0464620 B1 EP 0464620B1 EP 91110530 A EP91110530 A EP 91110530A EP 91110530 A EP91110530 A EP 91110530A EP 0464620 B1 EP0464620 B1 EP 0464620B1
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EP
European Patent Office
Prior art keywords
partial
partial write
memory
memory units
writing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP91110530A
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English (en)
French (fr)
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EP0464620A3 (en
EP0464620A2 (de
Inventor
Hiroshi C/O Canon Kabushiki Kaisha Inoue
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Canon Inc
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Canon Inc
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Publication of EP0464620A3 publication Critical patent/EP0464620A3/en
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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
    • G09G3/3648—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
    • 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
    • G09G2310/04—Partial updating of the display screen

Definitions

  • the present invention relates to a display system and, more particularly, to an image information control apparatus for use in a display system using a ferroelectric liquid crystal having a memory function.
  • a display panel using a ferroelectric liquid crystal (FLCD) imparted with a memory function is adopted in a PC or a WS, it is required to smoothly move, e.g., a mouse or a cursor to perform display.
  • a moving display is realized by a partial writing system (in which only scan lines corresponding to an area to be partially rewritten are scanned) as disclosed in U.S. Patent No. 4,655,561.
  • a partial writing system in which only scan lines corresponding to an area to be partially rewritten are scanned
  • partial rewrite demands are classified according to their corresponding priority and a partial rewrite operation is interrupted upon reception of a higher priority partial rewrite demand and is restarted after the higher priority partial rewrite operation has been completed. That is, the highest priority rewrite operation, i. e. the fastest current display movement like a cursor movement, is always completely carried out before a lower priority partial rewrite request is continued. Thus, in this prior art arrangement, areas to be rewritten with lower priority, like scrolling screens, are sometimes not entirely displayed.
  • an image information control apparatus and a display system using the same, the image information control apparatus comprising means for performing partial writing to a VRAM, characterized in that said means comprises a partial write detector for detecting and storing accessed addresses of the VRAM in units of lines in a scanning direction, said partial write detector comprising at least two memory units arranged so that, during one predetermined time period, one of the memory units is used in a detecting operation to detect new accessed-address information, while another of the memory units is used to retain previously detected information and, during a succeeding time period, the functions of the memory units are switched so that the other of the memory units is used in the detecting operation while the one of the memory units is used to retain the information detected in the preceding time period; means for performing calculations to recognize partial write information from contents of each of the two memory units; further memory units for storing the respective calculations results; means for comparing contents of the further memory units to determine a size relationship between partial write areas; means for controlling a partial write signal on the
  • an image information control apparatus and a display system using the same wherein the partial write information detected in units of lines by the memory units are identified as continuous line address groups in the scan line direction from the accessed address data, the number of addresses, a start line address or an end line address, or the number of lines is calculated for each group, and a total number of accessed lines is calculated.
  • an image information control apparatus and a display system using the same, wherein only access to the VRAM performed during writing is rendered valid.
  • an image information control apparatus and a display system using the same wherein a detection period (sampling period) of the memory units for executing detection and storage in units of lines in the scan direction is shorter than a storage period thereof.
  • an image information control apparatus and a display system using the same wherein when the size relationship between the partial write areas obtained from the partial write information is to be determined, a detection period (sampling period) of a memory unit having partial write information of a larger area is shorter than a storage period thereof.
  • an image information control apparatus and a display system using the same wherein a cycle of determining the size relationship between the partial write areas obtained from the partial write information is synchronized with a cycle of the partial write detector for repeating detection and storage such that the cycles are integer multiples with respect to the different memory units, respectively.
  • An apparatus anda system according to the present invention are suitable as a display using an FLCD (ferroelectric liquid crystal) imparted with a memory function and can allow use of both a partial writing method of realizing moving display such as a mouse or a cursor and a total-refresh scanning driving method.
  • FLCD ferroelectric liquid crystal
  • a partial writing method used in the present invention is basically performed as follows.
  • Fig. 20 illustrates four events, i.e., three independent windows and a moving mouse font.
  • a window 1 displays a clock
  • a window 2 displays a rotationally moving line
  • a window 3 displays vertical scrolling of characters.
  • the respective windows have different display speeds and display asynchronous with each other (independent events). Since a one-line access time of an FLCD remains unchanged, provided that a temperature is constant, a time (scanning time) required to perform each window display by partial writing is proportional to the size of a partial write area. If partial writing is generated in one window while partial writing is executed in another, one of the windows partial writing of which is executed prior to the other must be determined.
  • a priority order for partial writing operations must be predetermined when an event occurs so that the priority order is recognized to perform processing by predetermined procedures each time partial write request is generated. For example, the priority order is determined such that partial writing during scroll display is interrupted, clock display partial writing is performed, and then the interrupted partial writing is restarted, and procedures between the respective partial writing operations are determined accordingly.
  • the concept of priority order is unsatisfactory in a multitask system such as a UNIX/X-Window.
  • a multitask system such as a UNIX/X-Window.
  • several requests simultaneously access partial writing and are stored in host queues (Fig. 19). Thereafter, these requests are transferred from the respective host queues to a queue buffer of a server either via a network or internally.
  • the requests are set in the buffer of the server while their drawing order to a VRAM is held. Therefore, the priority order does not work well because the requests are processed in accordance with the drawing order. For example, although "mouse" has the highest priority, if a large number of image drawing requests to the VRAM are present before the mouse request, the mouse request is not executed until the foregoing requests are finished. That is, the mouse request cannot have the highest priority order in this multitask system (Fig. 20).
  • This scheduler functions to give a proper priority order for partial writing to a request from a queue of a host (Fig. 21).
  • Fig. 1 is a block diagram showing an apparatus of the present invention, in which a register for catching access information to a VRAM is illustrated. This information is transferred to an external circuit to count the number of partial writing operations or is transferred to another memory.
  • This register adopts at-random inputs and serial outputs.
  • Fig. 2 shows a multistack for obtaining a priority order in the present invention.
  • a stack 1 stores a partial write area for every ⁇ t.
  • a stack 2 basically stores a partial write area for every 2 ⁇ t in order to obtain a priority order.
  • the depth level of each stack is not determined.
  • Fig. 3 shows switching timings between partial writing and refresh in the present invention.
  • a value B represents the number of switching times. If A exceeds B, all of partial writing operations must be interrupted to maintain a screen image by refresh.
  • Fig. 4 shows two signals PAR and REF for performing switching between partial writing and refresh in the present invention.
  • a new GSP is controlling switching between partial writing and refresh.
  • this partial write H/W supplies the signal PAR to a new FLCD controller, and the FLCD controller supplies the signal REF to the H/W to perform refresh, independently of each other.
  • Fig. 5 shows several hardware of the present invention. Although Fig. 5 is not correct, it provides a concept. Double buffers are preferably used in a sampling register and a memory register.
  • Each register is constituted by a large number of F.F.s (Flip-Flops) or a static memory.
  • a read register is serially reset (Fig. 5).
  • Fig. 6 shows a static memory used in the present invention.
  • An accessed line address is assigned to an address of the static memory.
  • Data "1" is set at a memory address assigned to an accessed line address.
  • control is performed such that an address is automatically assigned to an auto-address generator.
  • an auto-data generator Upon resetting, an auto-data generator overwrites data "0" at all addresses of the memory while assigning addresses.
  • a case 1 shown in Fig. 1 shows a practical multi-register arrangement. In this case, only one request is generated, and processing is performed at the highest speed.
  • a case 2 shown in Fig. 8 shows another arrangement at a middle speed.
  • a case 3 shown in Fig. 9 shows an arrangement at high and middle speeds.
  • a case 4 shown in Fig. 10 shows an arrangement at a plurality of speeds. This arrangement has two windows which scroll at different speeds. This condition is strict for partial writing.
  • a case 5 shown in Fig. 11 is similar to the case 4 except that the sizes and positions of two windows on a screen are different from each other. This condition is also strict for partial writing.
  • a case 6 shown in Fig. 12 is similar to the case 3 except that the scroll speed of the case 6 is different from that in the case 3. This condition is also strict for partial writing.
  • a case 7 shown in Fig. 13 is still another arrangement of the case 3, in which an improved method of obtaining a priority order is used.
  • a case 8 shown in Fig. 14 is still another arrangement of the case 4. This arrangement has two windows which scroll at different speeds. Also in this case, an improved method of obtaining a priority order for partial writing is used.
  • a case 9 shown in Fig. 15 shows another arrangement of the case 5, in which an improved method of obtaining a priority order is used. This case is no longer hard as compared with the foregoing partial writings.
  • a case 10 shown in Fig. 16 shows another arrangement of the case 6, in which partial writing is no longer hard as compared with the foregoing cases. Also in this case, a timing chart shown in Fig. 17 is used.
  • Fig. 17 shows a sequence and switching of actual partial writing and refresh in the present invention according to the arrangement shown in Fig. 16.
  • FIG. 17 actual sampling timings of stacks 1 and 2 are shifted from each other. Access requests such as a-b, c-d, e-f, and g-h accompanying movement of a circle are detected in the sampling time of the stack 1, and scroll requests are detected in the sampling time of the stack 2. Since long partial writing has a priority to short one, the final result as partial write information is obtained as shown in Fig. 17.
  • Fig. 18 shows a practical example for explaining an actual sampling H/W in an FLCD interface according to the timing chart shown Fig. 17.
  • a scrolling image and a moving circle are present on a screen.
  • a VRAM access time per bit is 100 nsec.
  • a VRAM is constituted by 1 M x 8 bits.
  • the size of the circle is 100 x 100 bits, and the scroll size is 1 K x 1 K bits. Therefore, times required for the moving circle and the scrolling window are 0.125 msec. and 12.5 msec., respectively.
  • the circle moves every 25 msec., and scrolling is performed every 100 msec.
  • Types of access to the VRAM are actually READ access and WRITE access. Strictly speaking, the WRITE access is actually required in terms of partial write control.
  • Fig. 22 shows an example of copying one window to the other.
  • a copy source window is accessed to the VRAM in a READ CYCLE
  • a copy destination window is accessed in a WRITE CYCLE.
  • partial writing is started at only the copy destination and need not be performed at the copy source.
  • Partial writing is always performed after the access to the VRAM in the WRITE CYCLE and need not be performed in the READ CYCLE.
  • the FLCD requires a scheduler under the multitask.
  • long partial writing has a priority
  • partial write data latched at the start timing of partial writing has a priority.
  • another partial writing cycle is not accepted. Therefore, an order of actually generated partial write requests is uniformed during the sampling period, and partial writing operations are simultaneously executed thereafter. For this reason, a priority order of each event is converted into a size relationship between physical partial write areas by the hardware of item [1] above, and simultaneous partial writing operations are superposed within a certain period. Therefore, scheduling of the partial write request order at this timing is assumed to be completed.
  • the FLCD partial writing mainly requires two items, and these two items must have the same function in the hardware interface.
  • the item [1] is related to a priority order, and the item [2] is related to a scheduler.
  • the scheduler of item [2] above has no clear arrangement but is included in the hardware of item [1] and has a function different therefrom.
  • allocation of priority orders can be obtained by an H/W using the following procedures.
  • B means a limited value with respect to the total number.
  • B is probably smaller than the total number of scan lines because if B exceeds the total number, an access time for this partial writing exceeds a frame period. In other words, non-interlace is caused by partial writing over the frame period. For this reason, flicker is easily caused.
  • the pixel size of the FLCD is 1,024 (vertical) x 1,280 (horizontal) and the frame frequency (refresh rate) at an ordinary use temperature is 20 Hz.
  • the plurality of registers described above are designed to distinguish priority orders. However, a care must be paid to the cases 3 to 6 for allocating priority orders well.
  • a register 3, if present, detects the third fastest movement of, e.g., every 100 msec. ( 10 Hz). Although it is assumed that a register 4 detects a movement of every 200 msec. or more, the register 4 is meaningless because refresh of the FLCD is performed at 20 Hz or less (50 msec. or more). The register 3 is unnecessary for the same reason.
  • the priority order is "stack 2 > stack 1". In other words, until the longest partial writing with respect to an FLCD panel is finished, the stack 1 does not affect the partial writing. This will be described in more detail below. (The cases 1 and 2 are not affected by this new assumption because only one request is present in each case).
  • the fastest moving object is not continuously displayed but sometimes displayed or interlaced and displayed.
  • the movement of the stack 1 is interlaced as in the case 7.
  • the last invention about priority order allocation is an actual execution manner.
  • partial write data is instantaneously detected by the register and stored during the sampling period.
  • a certain period must be consumed in sampling.
  • the FLCD must have a scheduler for requests simultaneously generated especially under the multitask. Therefore, the H/W FLCD interface operates, for example, as shown in Fig. 17.
  • an actual sampling time of the stack 1 is 12.5 msec., and that of the stack 2 is 25 msec., i.e., twice that of the stack 1.
  • the gates to the detectors are "ON". Each register detects and stores an accessed line address.
  • the sampling interval of the stack 1 is 25 msec., and that of the stack 2 is 50 msec.
  • Two images are present on a screen: one is an image of a circle moving at a high speed; and the other, a scrolling window.
  • the access time of a VRAM per bit is 100 nsec/bit (this speed is considerably higher than other speeds). In this case, eight bits can be simultaneously accessed.
  • a scrolling window includes image information of a circle present on the screen. Partial writing of the circle moving during scrolling is displayed in accordance with information from the stack 1.
  • the refresh is, of course, continued until the next partial writing is detected.
  • compatibility with respect to a CRT display system is improved by simultaneously displaying partial scrolling and a mouse movement.

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Claims (13)

  1. Bildinformationssteuergerät mit
    einer Einrichtung zur Durchführung teilweisen Beschreibens eines Video-Schreib/Lese-Speichers (VRAM),
    gekennzeichnet durch
    einen Detektor für teilweises Beschreiben (REGISTER FÜR STACK) zur in einer Abtastrichtung zeilenweisen Erfassung und Speicherung von Zugriffsadressen des VRAM, wobei der Detektor für teilweises Beschreiben zumindest zwei Speichereinheiten (ABTASTREGISTER, SPEICHERREGISTER) umfaßt, die derart vorgesehen sind, daß während einer vorbestimmten Zeitperiode eine der Speichereinheiten bei einem Erfassungsvorgang zur Erfassung von neue Zugriffsadressen betreffenden Informationen verwendet wird, während die andere der Speichereinheiten verwendet wird, um zuvor erfaßte Informationen aufzubewahren, und während einer darauffolgenden Zeitperiode die Funktionen der Speichereinheiten umgeschaltet werden, so daß die andere der Speichereinheiten bei dem Erfassungsvorgang verwendet wird, während die eine der Speichereinheiten zur Aufbewahrung der in der vorhergehenden Zeitperiode erfaßten Informationen verwendet wird;
    eine Einrichtung zur Durchführung von Berechnungen (ERFASSE & BERECHNE) zur Erkennung von teilweises Beschreiben betreffenden Informationen aus Inhalten jeder der zwei Speichereinheiten (ABTASTREGISTER, SPEICHERREGISTER);
    weitere Speichereinheiten (STACK 1, STACK 2) zur Speicherung der jeweiligen Berechnungsergebnisse;
    eine Einrichtung zum Vergleichen von Inhalten der weiteren Speichereinheiten (STACK 1, STACK 2) zur Bestimmung einer Größenbeziehung zwischen Bereichen für teilweises Beschreiben;
    eine Einrichtung (FLCD H/W INT) zur Steuerung eines Signals für teilweises Beschreiben beruhend auf der Größenbeziehung zwischen Bereichen für teilweises Beschreiben und zur externen Ausgabe des Signals; und
    eine Einrichtung (NEUER FLCD CONTROLLER) zur erzwungenen Unterbrechung teilweisen Beschreibens, selbst während der Ausführung, entsprechend einem Zustand eines externen Auffrisch-Steuersignals, Durchführung des Auffrischens, und Wiederaufnahme teilweisen Beschreibens entsprechend einem Zustand für teilweises Beschreiben und einer Zustandsänderung des Auffrisch-Steuersignals.
  2. Gerät nach Anspruch 1,
    dadurch gekennzeichnet, daß
    die durch die zwei Speichereinheiten (ABTASTREGISTER, SPEICHERREGISTER) zeilenweise erfaßten Informationen für teilweises Beschreiben als kontinuierliche Zeilenadressgruppen in der Abtastzeilenrichtung aus den Zugriffsadressdaten erkannt werden, und die Einrichtung zur Durchführung von Berechnungen (ERFASSE & BERECHNE) zumindest einer der folgenden Größen: einer Anzahl von Adressen, einer Anfangszeilenadresse, einer Endzeilenadresse, der Zeilenanzahl für jede Gruppe, und/oder einer Gesamtanzahl von Zugriffszeilen berechnet.
  3. Gerät nach Anspruch 1,
    dadurch gekennzeichnet, daß
    nur ein während des Beschreibens erfolgender Zugriff auf den Video-Schreib/Lese-Speicher (VRAM) gültig gemacht wird.
  4. Gerät nach Anspruch 1,
    dadurch gekennzeichnet, daß,
    wenn die Größenbeziehung zwischen den aus den Informationen für teilweises Beschreiben erhaltenen Bereichen für teilweises Beschreiben zu bestimmen ist, eine Erfassungsperiode (Abtastperiode) einer Speichereinheit mit Informationen für teilweises Beschreiben eines größeren Bereichs kürzer ist als eine Speicherperiode derselben.
  5. Gerät nach Anspruch 1,
    dadurch gekennzeichnet, daß,
    ein Zyklus zur Bestimmung der Größenbeziehung zwischen den aus den Informationen für teilweises Beschreiben erhaltenen Bereichen für teilweises Beschreiben mit einem Zyklus des Detektors für teilweises Beschreiben zur Wiederholung der Erfassung und Speicherung derart synchronisiert ist, daß die Zyklen jeweils ganzzahlige Vielfache mit Bezug auf die zwei Speichereinheiten (ABTASTREGISTER; SPEICHERREGISTER) sind.
  6. Bildinformationssteuergerät nach Anspruch 1,
    das zudem ein Anzeigefeld umfaßt.
  7. Gerät nach Anspruch 6,
    dadurch gekennzeichnet, daß
    die durch die zwei Speichereinheiten (ABTASTREGISTER, SPEICHERREGISTER) zeilenweise erfaßten Informationen für teilweises Beschreiben als kontinuierliche Zeilenadressgruppen in der Abtastzeilenrichtung aus den Zugriffsadressdaten erkannt werden, und die Einrichtung zur Durchführung von Berechnungen (ERFASSE & BERECHNE) zumindest einer der folgenden Größen: einer Anzahl von Adressen, einer Anfangszeilenadresse, einer Endzeilenadresse, der Zeilenanzahl für jede Gruppe, und/oder einer Gesamtanzahl von Zugriffszeilen berechnet.
  8. Gerät nach Anspruch 6,
    dadurch gekennzeichnet, daß
    nur ein während des Beschreibens erfolgender Zugriff auf den Video-Schreib/Lese-Speicher (VRAM) gültig gemacht wird.
  9. Gerät nach Anspruch 6,
    dadurch gekennzeichnet, daß,
    wenn die Größenbeziehung zwischen den aus den Informationen für teilweises Beschreiben erhaltenen Bereichen für teilweises Beschreiben zu bestimmen ist, eine Erfassungsperiode (Abtastperiode) einer Speichereinheit mit Informationen für teilweises Beschreiben eines größeren Bereichs kürzer ist als eine Speicherperiode derselben.
  10. Gerät nach Anspruch 6,
    dadurch gekennzeichnet, daß,
    ein Zyklus zur Bestimmung der Größenbeziehung zwischen den aus den Informationen für teilweises Beschreiben erhaltenen Bereichen für teilweises Beschreiben mit einem Zyklus des Detektors für teilweises Beschreiben zur Wiederholung der Erfassung und Speicherung derart synchronisiert ist, daß die Zyklen jeweils ganzzahlige Vielfache mit Bezug auf die zwei Speichereinheiten (ABTASTREGISTER; SPEICHERREGISTER) sind.
  11. Anzeigegerät, mit:
    einer Flüssigkristall-Einrichtung mit einer Ansteuerungs-Steuereinrichtung, wobei der Flüssigkristall eine Speicherfunktion aufweist; und
    einem Bildinformationssteuergerät zur Durchführung teilweisen Beschreibens eines Video-Schreib/Lese-Speichers (VRAM) gemäß einem der vorhergehenden Ansprüche 1 bis 10.
  12. Anzeigegerät nach Anspruch 11,
    dadurch gekennzeichnet, daß
    der Flüssigkristall mit der Speicherfunktion ein ferroelektrischer Flüssigkristall ist.
  13. Bildinformationssteuerungsverfahren zur Steuerung teilweisen Beschreibens eines Video-Schreib/Lese-Speichers (VRAM), wobei das Verfahren umfaßt:
    Erfassen, während einer vorbestimmten Zeitperiode, von Zugriffszeilenadressen des Video-Schreib/Lese-Speichers (VRAM) in einer Abtastrichtung unter Verwendung einer Speichereinheit, während bereits erfaßte Daten in einer anderen Speichereinheit aufbewahrt werden;
    Berechnen von Informationen für teilweises Beschreiben aus den aufbewahrten Zeilenadressdaten;
    Speichern der Berechnungsergebnisse in zusätzlichen Speichereinheiten;
    Vergleichen von Inhalten der zusätzlichen Speichereinheiten, um relative Größen von Bereichen für teilweises Beschreiben zu erkennen;
    Bestimmen, ob eine Anzahl von Zugriffszeilenadressen eine bestimmte Anzahl überschreitet; und
    beruhend auf dem Bestimmungsergebnis, Unterbrechen teilweisen Beschreibens selbst während der Ausführung desselben, und Durchführen einer Auffrisch-Abtastung eines gesamten Bildes.
EP91110530A 1990-06-27 1991-06-26 Bildinformationssteuergerät und Anzeigesystem Expired - Lifetime EP0464620B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2171102A JP2840398B2 (ja) 1990-06-27 1990-06-27 画像情報制御装置及び表示システム
JP171102/90 1990-06-27

Publications (3)

Publication Number Publication Date
EP0464620A2 EP0464620A2 (de) 1992-01-08
EP0464620A3 EP0464620A3 (en) 1992-12-23
EP0464620B1 true EP0464620B1 (de) 1996-11-20

Family

ID=15917018

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91110530A Expired - Lifetime EP0464620B1 (de) 1990-06-27 1991-06-26 Bildinformationssteuergerät und Anzeigesystem

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Country Link
EP (1) EP0464620B1 (de)
JP (1) JP2840398B2 (de)
KR (1) KR950012016B1 (de)
AT (1) ATE145492T1 (de)
DE (1) DE69123182T2 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0558342B1 (de) * 1992-02-28 1997-08-20 Canon Kabushiki Kaisha Verfahren und Einrichtung zur Kontrolle einer Anzeigeeinheit
DE69309780T2 (de) * 1992-05-19 1997-10-23 Canon Kk Verfahren und Einrichtung zur Steuerung einer Anzeige
JP3156977B2 (ja) * 1992-05-19 2001-04-16 キヤノン株式会社 表示制御装置及び方法
EP0608056B1 (de) * 1993-01-11 1998-07-29 Canon Kabushiki Kaisha Anzeigelinienverteilungssystem
DE69421832D1 (de) * 1993-01-11 2000-01-05 Canon Kk Farbanzeigevorrichtung
AU672648B2 (en) * 1993-01-11 1996-10-10 Canon Kabushiki Kaisha Display line dispatcher apparatus
CN102737589A (zh) * 2011-03-29 2012-10-17 宏碁股份有限公司 用于液晶显示装置的控制方法及液晶显示装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU617006B2 (en) * 1988-09-29 1991-11-14 Canon Kabushiki Kaisha Data processing system and apparatus
AU634725B2 (en) * 1988-10-31 1993-03-04 Canon Kabushiki Kaisha Display system

Also Published As

Publication number Publication date
JPH0458221A (ja) 1992-02-25
JP2840398B2 (ja) 1998-12-24
KR920001418A (ko) 1992-01-30
DE69123182T2 (de) 1997-04-24
EP0464620A3 (en) 1992-12-23
EP0464620A2 (de) 1992-01-08
DE69123182D1 (de) 1997-01-02
ATE145492T1 (de) 1996-12-15
KR950012016B1 (ko) 1995-10-13

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