EP0725379A1 - Méthode et dispositif de commande d'appareils d'affichage d'images - Google Patents

Méthode et dispositif de commande d'appareils d'affichage d'images Download PDF

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Publication number
EP0725379A1
EP0725379A1 EP95119322A EP95119322A EP0725379A1 EP 0725379 A1 EP0725379 A1 EP 0725379A1 EP 95119322 A EP95119322 A EP 95119322A EP 95119322 A EP95119322 A EP 95119322A EP 0725379 A1 EP0725379 A1 EP 0725379A1
Authority
EP
European Patent Office
Prior art keywords
picture
pixels
liquid crystal
lines
display
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.)
Withdrawn
Application number
EP95119322A
Other languages
German (de)
English (en)
Inventor
Yasunori Ogawa
Kazuo Mochizuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Publication of EP0725379A1 publication Critical patent/EP0725379A1/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • G09G2310/0267—Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays
    • 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
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
    • G09G2340/0414—Vertical resolution change
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
    • G09G2340/0421—Horizontal resolution change
    • 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
    • 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
    • G09G3/3674—Details of drivers for scan electrodes
    • G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only

Definitions

  • the present invention relates to a method for driving a driving circuit such as a driver or the like used in a display device with a dot matrix of pixels.
  • writing pictures to liquid crystal pixels is performed with, for example, a liquid crystal display device, by providing liquid crystal display elements with TFT devices used as switching devices for application of voltages to liquid crystal pixels with a configuration where one TFT device is used as one pixel, drain terminals of the TFT devices are connected to electrodes for the liquid crystal pixels and their gate terminals and source terminals are arranged as lengthwise and lateral common terminals, applying voltages for the respective pixels to their source common terminals as picture signals and applying voltages for continuity between sources and drains of the TFT devices to their gate common terminals thereby applying ON-voltages to all the TFT devices connected to the gate common terminals (usually for one horizontal line on the display screen) to establish continuity between the sources and the drains.
  • FIG. 7 is a view of the configuration of a conventional liquid crystal panel with TFT devices.
  • Liquid crystal display devices are driven by two types of driving elements designated as source driver and gate driver, connected to the TFT devices.
  • source driver and gate driver connected to the TFT devices.
  • picture data for each pixel is designed to be displayed with a single dot of the liquid crystal panel, eventually filling the 1280 x 1024 screen exactly.
  • each pixel of picture data is magnified twice vertically and horizontally as shown in FIG. 5 for displaying over four dots of the liquid crystal panel, thus resulting in an enlarged display using 1280 x 800 pixels of the liquid crystal panel as the display screen.
  • the resolution of input signals is increased twice vertically and horizontally for enlarged displaying so long as the increased resolution does not exceed the number of pixels of the liquid crystal panel.
  • This also applies to other input signals of resolution capable of being increased by an integral multiple, and displaying is performed with no more than the maximum integral multiple of the resolution which does not exceed the number of pixels of the liquid crystal panel used in either of the vertical and the horizontal directions.
  • Picture display areas have a variety of resolutions depending on the particular pieces of hardware and software used. For example, in cases where input signals have a 1024 x 768 resolution and this resolution is magnified twice vertically and horizontally to 2048 x 1536 which exceeds the number of pixels of the liquid crystal panel used, all the information of the input signals cannot be displayed on such a liquid crystal panel as shown in FIG. 7. Therefore, displaying is performed with the original 1024 x 768 resolution, as shown in FIG. 6. This naturally results in a display at the center or another area of the liquid crystal panel at a smaller size than the liquid crystal panel.
  • a method for driving a picture display device with a dot matrix of pixels to display pictures based on picture signals of any given resolution with any desired number of pixels using the display device comprising: displaying an identical picture signal of one horizontal scanning period in one or more lines each and varying the vertical displaying magnification factor for the picture signal by periodically varying the number of lines which display the identical signal.
  • FIG. 1 is a view illustrative of the configuration of an embodiment according to the present invention
  • FIG. 2 is a view illustrative of the operation of the embodiment of the present invention
  • FIG. 3 is a view illustrative of an instance of displaying a picture with the embodiment according to the present invention
  • FIG. 4 is a view illustrative of an instance of the drive timing chart of a liquid crystal driver IC which realizes the embodiment according to the present invention.
  • 1 denotes a picture signals are input terminal through which picture signals are inputted to a data driver 4.
  • 2 denotes a synchronizing signal input terminal through which, for example, horizontal synchronizing signals and vertical synchronizing signals are inputted.
  • 3 denotes a timing control circuit or a circuit for supplying a variety of timing pulses or clocks, etc. to the data driver 4 and a gate driver 5 in order to display input picture signals on a liquid crystal panel.
  • 7 denotes a PIL circuit and 8 is the liquid crystal panel.
  • the present invention relates to a liquid crystal panel driving circuit which is effective for displaying input signals of lower resolution then the number of pixels of the liquid crystal panel used for displaying images; for example, it is a liquid crystal panel driving circuit which makes a better use of pixels of a liquid crystal panel display in cases where input signals of 1020 x 768 resolution are being displayed on a liquid crystal panel with resolution 1280 pixels wide by 1024 pixels high.
  • the state of a picture displayed according to the present invention is such one as illustrated in FIG. 3.
  • a characteristic aspect of the present invention resides in a method for loading picture data into liquid crystal pixels, as shown in FIG. 2, which is a characteristic method for driving the gate driver 5 mainly vertically.
  • FIG. 2 is a characteristic method for driving the gate driver 5 mainly vertically.
  • the process of the 1.25-times vertical magnification is actually accomplished by loading every four lines of picture data into five lines of the liquid crystal panel. More specifically, one of the four lines of picture data is loaded into two lines of the liquid crystal panel, and the remaining three lines of picture data is loaded into three lines of the liquid crystal panel, respectively.
  • a chart illustrative of drive timing by a gate driver IC at this point in time is as shown in FIG. 4.
  • the data driver for guiding picture signals to the liquid crystal pixels are designed to sample and hold each line of the picture signals for outputting to the liquid crystal pixels.
  • the configuration of a representative gate driver is illustrated in FIG. 8.
  • timing is provided to output gate pulses of the first line and the second line of the gate driver IC. Subsequently, when the picture data is for scanning lines 2 through 4, pulses of the third lines through fifth line of the gate driver IC are generated in succession. With these timing pulses, loading of each four lines of picture data into five lines of the liquid crystal panel is repeated until a total of 768 vertical lines of picture data is loaded into 960 lines of the liquid crystal panel to accomplish a 1.25-times vertical magnification.
  • the sampling clocks are increased to 1.25 times in synchronization with the vertical magnification/reduction factor, and the number of samples of the picture data is increased from 1024 dots to 1280 dots or 1.25 times for the horizontal magnification.
  • FIG. 9 illustrates in instance of the configuration of the timing control circuit 3 for generation of the gate driver IC shift clocks shown in the timing chart of FIG. 4, while FIG. 10 illustrates timing charts for the respective signals.
  • input clocks 22 and half clocks 23 generated by dividing the clocks 22 into halves by a divider 15 are inputted to A and B of a selector 17, respectively.
  • the function of this selector 17 is designed to output the A input to Y when the selector terminal S is at a low level and the B input to Y when the selector terminal S is at a high level.
  • the counter 16 is designed so as to count up upon reverse clocks of the input clocks 22 and to input an output 24 of the counter 16 to A of each of two comparators 18 and 19.
  • the counter 16 is designed to be such a counter as to be reset in synchronization with a clock when the reset terminal is HIGH.
  • the operation of the above-explained timing control circuit shown in FIG. 9 is illustrated by the timing chart shown in FIG. 10 which demonstrates the successful operation of the present invention by realizing such a gate driver IC drive timing chart as shown in FIG. 4.
  • driver IC as shown in FIG. 4 which is means for loading each one line of picture data into a plurality of lines of the panel without using any storage element such as a memory, but also by using a storage element such as a memory.
  • the magnification of display may be varied as desired for other magnification factors as well by controlling the number of writable lines (controlling the drive timing with the gate driver IC) with respect to the vertical direction and by varying the sampling clocks with respect to the horizontal direction.
  • the present invention may be applied to display devices with a dot matrix of pixels, and an entirely identical effect to that of the present invention may be produced in any mode of displaying in which picture data is distributed to the respective pixels for displaying so long as the distribution of picture signals to the respective pixels for displaying may be achieved in the same manner as in the embodiment described above.
  • the present invention may also be applied to display devices other than the TFT active matrix liquid crystal display explained in the above embodiment, for example, display devices with a dot matrix of light-emitting elements such as LEDs or plasma displays.
  • the present invention allows better use of displayable areas of such picture display devices by writing and displaying of the maximum picture data possible over the entire displayable areas of the picture display devices, which is achieved by a technique for displaying each picture over an any desired number of pixels in cases where picture signals of any given resolution are being displayed on the picture display devices used.

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  • Engineering & Computer Science (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)
  • Liquid Crystal (AREA)
  • Transforming Electric Information Into Light Information (AREA)
EP95119322A 1994-12-09 1995-12-07 Méthode et dispositif de commande d'appareils d'affichage d'images Withdrawn EP0725379A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP306114/94 1994-12-09
JP6306114A JP2919283B2 (ja) 1994-12-09 1994-12-09 映像表示装置の駆動回路

Publications (1)

Publication Number Publication Date
EP0725379A1 true EP0725379A1 (fr) 1996-08-07

Family

ID=17953220

Family Applications (1)

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EP95119322A Withdrawn EP0725379A1 (fr) 1994-12-09 1995-12-07 Méthode et dispositif de commande d'appareils d'affichage d'images

Country Status (3)

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EP (1) EP0725379A1 (fr)
JP (1) JP2919283B2 (fr)
CA (1) CA2164803C (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0854466A1 (fr) * 1997-01-10 1998-07-22 Matsushita Electric Industrial Co., Ltd. Dispositif de commande d'un système d'affichage à panneau plat pour des formats d'image multiples
WO2000002184A1 (fr) * 1998-07-06 2000-01-13 Flat Panel Display Co. (Fpd) B.V. Afficheur matriciel conçu pour l'affichage de signaux video de differentes normes
EP0984421A2 (fr) * 1998-09-02 2000-03-08 Alps Electric Co., Ltd. Appareil et méthode d'affichage pour agrandir et réduire des signaux vidéo en fonction du dispositif d'affichage
EP1005011A1 (fr) * 1998-11-27 2000-05-31 Alps Electric Co., Ltd. Dispositif d'affichage ayant la fonction d'afficher signaux vidéo commes images agrandies/amincies
CN101859557B (zh) * 2009-04-07 2012-02-22 奇菱科技股份有限公司 显示系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100205009B1 (ko) 1996-04-17 1999-06-15 윤종용 비디오신호 변환장치 및 그 장치를 구비한 표시장치
CN115001058B (zh) * 2021-12-24 2023-04-11 荣耀终端有限公司 电子设备、供电方法及计算机存储介质

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3840839A1 (de) * 1987-12-09 1989-06-29 Mitsubishi Electric Corp Schaltungsanordnung fuer einen bildschirm
EP0540294A2 (fr) * 1991-10-28 1993-05-05 Canon Kabushiki Kaisha Dispositif de commande d'affichage et appareil d'affichage comportant un dispositif de commande d'affichage
EP0574142A1 (fr) * 1992-06-08 1993-12-15 International Business Machines Corporation Circuit de commande pour dispositif d'affichage à matrice de points
DE4412429A1 (de) * 1993-04-12 1994-10-27 Mitsubishi Electric Corp Anzeigesteuereinheit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05303362A (ja) * 1992-04-28 1993-11-16 Sharp Corp 表示装置
JPH05333810A (ja) * 1992-05-29 1993-12-17 Toshiba Corp 表示制御装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3840839A1 (de) * 1987-12-09 1989-06-29 Mitsubishi Electric Corp Schaltungsanordnung fuer einen bildschirm
EP0540294A2 (fr) * 1991-10-28 1993-05-05 Canon Kabushiki Kaisha Dispositif de commande d'affichage et appareil d'affichage comportant un dispositif de commande d'affichage
EP0574142A1 (fr) * 1992-06-08 1993-12-15 International Business Machines Corporation Circuit de commande pour dispositif d'affichage à matrice de points
DE4412429A1 (de) * 1993-04-12 1994-10-27 Mitsubishi Electric Corp Anzeigesteuereinheit

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0854466A1 (fr) * 1997-01-10 1998-07-22 Matsushita Electric Industrial Co., Ltd. Dispositif de commande d'un système d'affichage à panneau plat pour des formats d'image multiples
US6333751B1 (en) 1997-01-10 2001-12-25 Matsushita Electric Industrial Co., Ltd. Multiscanning type display apparatus
WO2000002184A1 (fr) * 1998-07-06 2000-01-13 Flat Panel Display Co. (Fpd) B.V. Afficheur matriciel conçu pour l'affichage de signaux video de differentes normes
EP0984421A2 (fr) * 1998-09-02 2000-03-08 Alps Electric Co., Ltd. Appareil et méthode d'affichage pour agrandir et réduire des signaux vidéo en fonction du dispositif d'affichage
EP0984421A3 (fr) * 1998-09-02 2000-05-24 Alps Electric Co., Ltd. Appareil et méthode d'affichage pour agrandir et réduire des signaux vidéo en fonction du dispositif d'affichage
US6281869B1 (en) 1998-09-02 2001-08-28 Alps Electric Co., Ltd. Display device capable of enlarging and reducing video signal according to display unit
EP1005011A1 (fr) * 1998-11-27 2000-05-31 Alps Electric Co., Ltd. Dispositif d'affichage ayant la fonction d'afficher signaux vidéo commes images agrandies/amincies
US6618032B1 (en) 1998-11-27 2003-09-09 Alps Electric Co., Ltd. Display apparatus having functions of displaying video signals as enlarged/thinned pictures
CN101859557B (zh) * 2009-04-07 2012-02-22 奇菱科技股份有限公司 显示系统

Also Published As

Publication number Publication date
JP2919283B2 (ja) 1999-07-12
JPH08160904A (ja) 1996-06-21
CA2164803A1 (fr) 1996-06-10
CA2164803C (fr) 2000-07-25

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