EP0261629A2 - Anzeigeeinrichtung - Google Patents

Anzeigeeinrichtung Download PDF

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Publication number
EP0261629A2
EP0261629A2 EP87113793A EP87113793A EP0261629A2 EP 0261629 A2 EP0261629 A2 EP 0261629A2 EP 87113793 A EP87113793 A EP 87113793A EP 87113793 A EP87113793 A EP 87113793A EP 0261629 A2 EP0261629 A2 EP 0261629A2
Authority
EP
European Patent Office
Prior art keywords
character
display
signal
subscript
superscript
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Withdrawn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
EP87113793A
Other languages
English (en)
French (fr)
Other versions
EP0261629A3 (de
Inventor
Kikuo Kurita
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.)
Minolta Co Ltd
Original Assignee
Minolta Co Ltd
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 Minolta Co Ltd filed Critical Minolta Co Ltd
Publication of EP0261629A2 publication Critical patent/EP0261629A2/de
Publication of EP0261629A3 publication Critical patent/EP0261629A3/de
Withdrawn legal-status Critical Current

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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
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/22—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of characters or indicia using display control signals derived from coded signals representing the characters or indicia, e.g. with a character-code memory
    • G09G5/24—Generation of individual character patterns

Definitions

  • the present invention relates to a display apparatus mounted on office automation machinery such as the word processor, personal computer, electronic typewriter and the like.
  • Office automation machinery such as the word processor, personal computer, electronic typewriter and the like have made rapid progress in recent years as the central instrument for streamlining office work.
  • the conventional system of displaying superscript and subscript presents both superscript and subscript by means of the same font data by utilizing the polarity of an MSD signal (most significant digit bit data) in a raster address transmitted from the number of character lines register which transmits the raster address is incremented with every raster scan on the display screen and is reset with every count to the number of rasters (for example, 16) corresponding to one normal size character which is approximately twice the size of a superscript or subscript character.
  • MSD signal most significant digit bit data
  • the most significant digit bit data output from this register is "0" until the upper half of the normal size character is displayed on the display screen, and "1" after the upper half is displayed and until the lower half is displayed.
  • the upper half of the normal size character corresponds precisely to the display region of superscript, and the lower half to the display region of subscript.
  • the porality of the MSD signal is reversed between the superscript display and the subscript display.
  • Fig. 1 shows a known control circuit for producing superscript and subscript from one font data by utilizing the MSD signal as noted above.
  • This control circuit comprises a character generator memory b which stores bit data having character "A" for the upper half and a blank pattern for the lower half, for example, as shown in Fig. 2A.
  • a super/sub switching signal is reversible between "0" for displaying superscript and "1" for displaying subscript. Assuming that the super/sub switching signal is set to "0", the MSD signal is input through an EXCLUSIVE OR gate to the character generator memory b with its polarity remaining unreversed. Consequently, the character pattern in the upper half of Fig.
  • the foregoing conventional system which is capable of displaying both superscript and subscript by means of one character font, has the advantage of requiring only a half memory capacity compared with the case of storing character font data corresponding to superscript characters and subscript characters.
  • this system also has the disadvantage of including the insignificant blank data in either the upper half or the lower half of the character matrix.
  • the number of character fonts stored in the character generator memory is overwhelming.
  • one character font requires a memory capacity of several to several tens of bytes.
  • the character generator memory must, therefore, have a very large capacity, and hence the problem of enlarging and raising the cost of apparatus.
  • a primary object of the present invention is to provide a display apparatus including a character memory having a reduced capacity.
  • Another object of the invention is to provide a display apparatus for displaying superscript and subscript by using a character generator storing a superscript and subscript characters in a font data from that does not include the insignificant blank data.
  • a further object of the invention is to provide a display apparatus which allows superscript and subscript to be displayed with a desired number of rasters.
  • a display apparatus which comprises a display sequencer for generating a character address signal, a raster address signal and a synchronizing signal; video memory meams for outputting character code data selected by the character address signal from the display sequencer; a character generator for receiving the character code data and the raster address signal and outputting a bit pattern for a selected character, the character generator storing significant data for superscript and subscript excluding unnecessary blank data; raster scan type display means operable in response to the synchronizing signal received from the display sequencer for displaying a character corresponding to the bit pattern generated by the character generator; and control means for enabling and disabling the character generator, the control means enabling the character generator at a raster address value corresponding to a superscript display region when a superscript select signal is input from outside, and at a raster address value corresponding to a subscript display region when a subscript select signal is input from outside.
  • control means includes a logic circuit for deriving a logical product conjunction of a most significant digit signal from a register for counting raster addresses corresponding to one character, and the superscript select signal and subscript select signal input from outside.
  • control means may include a decoder for decoding the raster address, and a logic circuit for deriving a logical product conjunction of a decode signal generated by the decoder and the superscript select signal and subscript select signal.
  • the decoder is operable to set a decode output to a selected raster address value.
  • the character generator may include means for producing a mock blank pattern when in a disable state.
  • the raster scan type display means may comprise a flat panel display.
  • the display sequencer and the video memory means are connected through a data bus to a CPU which rewrites the number of character lines and the character code data.
  • the CPU supplies the superscript select signal and the subscript select signal to the control means.
  • a display apparatus comprising a display sequencer for generating a character address signal, a raster address signal and a synchronizing signal; video memory means for outputting character code data selected by the character address signal from the display sequencer; a character generator for receiving the character code data and the raster address signal and outputting a bit pattern for a selected character, the character generator storing significant data for superscript and subscript excluding unnecessary blank data; conversion means for effecting parallel to serial conversion of the bit pattern generated by the character generator; raster scan type display means for receiving the bit pattern after the parallel to serial conversion in accordance with the synchronizing signal provided by the display sequencer, and displaying a character corresponding to the bit pattern; and control means for enabling and disabling the character generator, the control means enabling the character generator at a raster address value corresponding to a superscript display region when a superscript select signal is input from outside, and at a raster address value corresponding to a subscript display region when a sub
  • the enable signal when the enable signal is transmitted from the control means to the character generator, a selected character is displayed in superscript or subscript.
  • the bit data of the character displayed in superscript or subscript on the screen is a minimum data excluding an unnecessary blank pattern.
  • Fig. 3 is a block diagram illustrating an entire display apparatus.
  • This display apparatus comprises a CPU 1, a display sequencer 2, a video RAM 3, a latch 4, a character generator memory 5, a shift register 6, a display 8, and an external input device 8 such as a keyboard.
  • the character generator memory 5 stores characters in various scripts constituted by significant data.
  • the significant data here means minimum bit data excluding unnecessary space data and corresponding to selected scripts stored in the memory 5.
  • the display apparatus further comprises a control device 9 for controlling display of the characters in superscript or subscript on a screen.
  • the CPU 1 is connected through a data bus A to the display sequencer 2, video RAM 3 and latch 4.
  • the CPU 1 transmits a rewrite command regarding the number of lines to be displayed to the display sequencer 2, and a character code rewrite command to the video RAM 3.
  • the display sequencer 2 transmits a character address signal to the video RAM 3 through a bus line B, a raster address signal to the character generator memory 5 through a bus line E, and a synchronizing signal to the display 7 through a signal line G.
  • the character address signal corresponds to a character position on the screen of display 7.
  • the video RAM 3 Upon receipt of this signal, the video RAM 3 outputs a character code data corresponding to a character address in the video RAM 3.
  • the CPU 1 and the display sequencer 2 access to the video RAM 3.
  • One display cycle period is divided into two parts, one of which is allocated for the access by the CPU and the other for the access by the display sequencer 2.
  • the character code data output from the video RAM 3 are retained at the latch 4 during one display cycle, and are successively input to an address input terminal of the character generator memory 5 through a bus line D.
  • the character generator memory 5 receives, along with the character code data, the raster address signal from the display sequencer 2, and outputs character bit data corresponding to the two signals.
  • the raster address is the number (or address) produced by a number of character lines register included in the display sequencer 2 for determining each of rasters (16 rasters, for example) corresponding to one character in the normal size.
  • the characters are presented in a selected script on the screen of display 7 under control by the control device 9. More particularly, the control device 9 outputs an appropriate enable signal to the character generator memory 5 after receiving a superscript select signal or a subscript select signal input from the external input device 8 through the CPU 1 and checking this signal with the raster address signal received from the display sequencer 2.
  • Fig. 4 shows a specific circuit construction of the control device 9.
  • the control device 9 allows the characters to be displayed in the superscript region or the subscript region through polarity reversal of the MSD signal.
  • the superscript select signal is input in "1” to a first NAND gate 10. Therefore, the first NAND gate 10 outputs a signal in "1” which is input in "0” to an OR gate 13 when the MSD signal is output in "0".
  • a second NAND gate 11 receives the subscript select signal in "0” and the MSD signal in "1” through a NOT gate 12.
  • the second NAND gate 11 outputs a signal in "1" which is input in “0” to the OR gate 13.
  • the OR gate 13, therefore, outputs a signal in "1" which constitutes the enable signal input to the character generator memory 5.
  • the character generator memory 5 generates the bit data in response to the enable signal, the character code data input from the video RAM 3 and the raster address signal input from the display sequencer 2.
  • the bit data output from the character generator memory 5 is applied to the shift register 6 through a data line E, where the bit data are subjected to parallel to serial conversion for input to the display 7 as a video signal.
  • the display 7 shows the character "A" in the superscript region 14 of the screen as illustrated in Fig. 5A.
  • selected characters may be disabled on the screen by enabling superscript or subscript as described above. It is now possible for superscript or subscript characters stored in the character generator memory 5 to be constituted by significant data only, thereby permitting the character generator memory 5 to have a small capacity.
  • Table 1 shows the relationship between the superscript select signal and other input signals and the enable signal.
  • the enable signal is input to the character generator memory 5 when the superscript select signal and the subscript select signal are provided simultaneously.
  • This allows characters to be displayed in superscript and subscript almost simultaneously through polarity reversal of the MSD signal, which provides convenience for the operator.
  • the use of a switching signal results in the inconvenience of the characters being displayed in either superscript of subscript.
  • Fig. 6 illustrates another embodiment which includes a decoder 16 for detecting and decoding the numerical value of the raster address signal input from the display sequencer, thereby allowing the number of rasters to be freely selected for a decode region. While the embodiment of Fig. 4 allows the number of rasters to be set only to the powers of 2, the embodiment of Fig. 6 allows the number of rasters to be set to any even number. In other words, the input signal from the raster address corresponding to the powers of 2 such as 20, 21, 22, 23, etc. may be combined into any selected value through a decoder 16, thereby to increase the freedom of selecting the number of rasters for the characters in superscript or subscript. According to the construction illustrated in Fig.
  • a first NAND gate 10 receives a superscript select signal and a raster address signal (U signal) for the superscript region
  • a second NAND gate 11 receives a subscript select signal and a raster address signal (L signal) for the subscript region.
  • the character generator memory receives an enable signal and outputs corresponding bit data whereby, as illustrated in Fig. 7, the character "A" is displayed in the superscript region 14 including ten rasters.
  • characters may be displayed in various sizes by varying the number of rasters for the superscript region 14.
  • the character font stored in the character generator memory 5 may include an uppermost range X and a lowermost range Y void of significant data, with decode regions partly overlapping each other. This allows the number of rasters to be set to odd numbers. If significant data were stored in the ranges X and Y, an inconvenience could be encountered in which the decode regions overlap each other when characters are displayed in superscript and subscript. The above arrangement, however, allows the number of rasters to be set to odd numbers thereby further increasing the freeom of character display in superscript and subscript. This embodiment is particularly effective for a display device such as a panel type display which has a limited number of display dots.
  • Figs. 9(A) and 9(B) illustrate another method of allowing the number of rasters to be set to odd numbers.
  • an interleave is provided between the uppermost range X and the lowermost range Y of the decode region, whereby intermediate scan lines always represent a blank on the screen.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Controls And Circuits For Display Device (AREA)
EP87113793A 1986-09-20 1987-09-21 Anzeigeeinrichtung Withdrawn EP0261629A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP61222959A JPS6377093A (ja) 1986-09-20 1986-09-20 デイスプレイ表示装置
JP222959/86 1986-09-20

Publications (2)

Publication Number Publication Date
EP0261629A2 true EP0261629A2 (de) 1988-03-30
EP0261629A3 EP0261629A3 (de) 1989-10-11

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Family Applications (1)

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EP87113793A Withdrawn EP0261629A3 (de) 1986-09-20 1987-09-21 Anzeigeeinrichtung

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EP (1) EP0261629A3 (de)
JP (1) JPS6377093A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11274517B2 (en) 2020-05-28 2022-03-15 Schlumberger Technology Corporation Rotating control device system with rams
US11401771B2 (en) 2020-04-21 2022-08-02 Schlumberger Technology Corporation Rotating control device systems and methods
US11732543B2 (en) 2020-08-25 2023-08-22 Schlumberger Technology Corporation Rotating control device systems and methods
US11781398B2 (en) 2020-05-11 2023-10-10 Schlumberger Technology Corporation Rotating control device system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4163229A (en) * 1978-01-18 1979-07-31 Burroughs Corporation Composite symbol display apparatus
WO1981000470A1 (en) * 1979-08-03 1981-02-19 Harris Corp Video display terminal having improved character shifting circuitry
EP0076082A2 (de) * 1981-09-21 1983-04-06 Nec Corporation Anzeigedatenverarbeitungsgerät
AU548346B2 (en) * 1984-02-16 1985-12-05 Vultron, Inc. Matrix display

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4163229A (en) * 1978-01-18 1979-07-31 Burroughs Corporation Composite symbol display apparatus
WO1981000470A1 (en) * 1979-08-03 1981-02-19 Harris Corp Video display terminal having improved character shifting circuitry
EP0076082A2 (de) * 1981-09-21 1983-04-06 Nec Corporation Anzeigedatenverarbeitungsgerät
AU548346B2 (en) * 1984-02-16 1985-12-05 Vultron, Inc. Matrix display

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLERIN *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11401771B2 (en) 2020-04-21 2022-08-02 Schlumberger Technology Corporation Rotating control device systems and methods
US11781398B2 (en) 2020-05-11 2023-10-10 Schlumberger Technology Corporation Rotating control device system
US11274517B2 (en) 2020-05-28 2022-03-15 Schlumberger Technology Corporation Rotating control device system with rams
US11732543B2 (en) 2020-08-25 2023-08-22 Schlumberger Technology Corporation Rotating control device systems and methods

Also Published As

Publication number Publication date
JPS6377093A (ja) 1988-04-07
EP0261629A3 (de) 1989-10-11

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