EP0175499A3 - Display system for computers - Google Patents

Display system for computers Download PDF

Info

Publication number
EP0175499A3
EP0175499A3 EP85305996A EP85305996A EP0175499A3 EP 0175499 A3 EP0175499 A3 EP 0175499A3 EP 85305996 A EP85305996 A EP 85305996A EP 85305996 A EP85305996 A EP 85305996A EP 0175499 A3 EP0175499 A3 EP 0175499A3
Authority
EP
European Patent Office
Prior art keywords
codes
control unit
screen image
ram
image ram
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Withdrawn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
EP85305996A
Other languages
German (de)
French (fr)
Other versions
EP0175499A2 (en
Inventor
Kazuhiro Miyashita
Hideji Katayama
Etsuo Iijima
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.)
EMC Corp
Original Assignee
Data General 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 Data General Corp filed Critical Data General Corp
Publication of EP0175499A2 publication Critical patent/EP0175499A2/en
Publication of EP0175499A3 publication Critical patent/EP0175499A3/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals

Landscapes

  • 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)
  • Controls And Circuits For Display Device (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Digital Computer Display Output (AREA)

Abstract

A CPU communicates over a bus (203) with a liquid crystal display (LCD) device (209) by way of a control unit (217), a disp­ lay memory (213) and another control unit (219). The memory (213) includes a screen image RAM (223) which is a pixel memory cyclically accessed by the latter control unit (219) to keep the display refreshed. The former control unit (217) keeps the contents of the screen image RAM (223) up­ dated in accordance with ASCII codes in a RAM (221), each with an associated attribute code. The control unit (217) con­ verts ASCII character codes into corresponding groups of pixel codes written into the screen image RAM (223) by reference to a font pattern RAM (225). ASCII graphic codes are passed to the screen image RAM (223) without conversion but, in either event, the attribute codes selectively modify what goes into the screen image RAM (223), on a character by character ba­ sis, to determine whether normal or reverse video is employed, blinking characters are employed, a high speed, imperceptible blinking is employed to provide an intermediate visual tone and to implement a form of colour emulation in which colour codes in the attribute codes select the background tone (and comple­ mentary foreground tone) of the display.
EP85305996A 1984-08-22 1985-08-22 Display system for computers Withdrawn EP0175499A3 (en)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US64313284A 1984-08-22 1984-08-22
US64313584A 1984-08-22 1984-08-22
US64313484A 1984-08-22 1984-08-22
US64313384A 1984-08-22 1984-08-22
US643135 1984-08-22
US643134 1984-08-22
US643133 1996-05-02
US643132 1996-05-02

Publications (2)

Publication Number Publication Date
EP0175499A2 EP0175499A2 (en) 1986-03-26
EP0175499A3 true EP0175499A3 (en) 1988-01-27

Family

ID=27505248

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85305996A Withdrawn EP0175499A3 (en) 1984-08-22 1985-08-22 Display system for computers

Country Status (2)

Country Link
EP (1) EP0175499A3 (en)
AU (1) AU4560185A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4740786A (en) * 1985-01-18 1988-04-26 Apple Computer, Inc. Apparatus for driving liquid crystal display
JP2556832B2 (en) * 1985-07-12 1996-11-27 シャープ株式会社 Display device
JP3025809B2 (en) * 1989-08-11 2000-03-27 インターナシヨナル・ビジネス・マシーンズ・コーポレーシヨン Display device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
1983 SID INTERNATIONAL SYMPOSIUM, DIGEST OF TECHNICAL PAPERS, 1st edition, May 1983, pages 32-33, SID, Coral Gables, US; Y. SUZUKI et al.: "A liquid-crystal image display" *

Also Published As

Publication number Publication date
AU4560185A (en) 1986-02-27
EP0175499A2 (en) 1986-03-26

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Inventor name: IIJIMA, ETSUO

Inventor name: MIYASHITA, KAZUHIRO

Inventor name: KATAYAMA, HIDEJI