Computer graphics processing and selective visual display system – Display peripheral interface input device – Including keyboard
Patent
1996-03-18
1998-07-28
Saras, Steven J.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Including keyboard
345145, 345146, G09G 500
Patent
active
057868093
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to computer technology and, more particularly, the invention relates to a method of entering the symbolic information into a computer system.
BACKGROUND OF THE INVENTION
Known in the art is a method of entering symbolic information, in which use is made of a display and a keyboard for data exchange with a system unit.
In the process of entering the symbolic information into a computer system, the user is a source and the computer system is a receiver of the information. The information is also distributed inside the computer system between its components. The keyboard is a source for the system unit, which in this case is an information receiver. The system unit is a source of information for the display serving as an information receiver.
The keyboard is a set of keys marked by images of symbols. Each key has its own numerical code. The keyboard successively registers the facts of pressing the keys and transfers the sequence of the codes of the pressed keys to the system unit. The keys are of two types: character and functional. The character keys are used for entering characters (letters, digits, periods, comas, brackets, standard pictograms) into the system unit. These characters can then be printed or shown on the screen of a display. The functional keys are used for sending the control codes to the computer system.
In the process of entering the symbolic information into the computer system the display is an output device and is employed by the user to control the process of entry of the symbolic information. The display screen is divided into positions in which the characters can be shown. The screen is divided into a definite number of lines and columns of the positions. Thus, each position has its own coordinates: a number of a line and a number of a column. One of the characters is a space character or "blank" image. The clear display screen means that the space character is present in all positions. The display screen is provided with an allocated position which is called the output position. By alternating the operations of output of the characters and change of the output positions, one can form an image on the display screen in a definite way.
In order that the user can see and control the output position on the display screen, use is made of an item cursor or, as it is sometimes called, a text cursor. It is always placed at the output position. This cursor is often shown in the form of an underline mark which, when interposed on any other symbol, does not cover it.
The process of entering symbolic information consists of a train of pressing the keyboard keys by the user. Each pressing on the character key is accompanied by execution of a definite chain of operations in the computer system: the keyboard transmits the character code to the system unit, then the system unit generates an image of the respective character on the display screen in the output position, after that the system unit finds a new space for the output position and puts the text cursor there. After that the computer system is ready for reception of a new character code from the keyboard. All these operations, after the key has been pressed, are executed in real time, i.e. during such a short period of time that it seems instantaneous to the user.
In the process of conventional entry of a text into the IBM PC computer the input position on the screen marked by the cursor, after a regular input of a character and its output to the display screen, comes for one step to the right, as it is adopted in the European letter style, in which each new letter is written to the right from the written text. This is an operating mode in the so called "typewriter" style which is presently a standard procedure. With such a technology of the entry the user acquires a stable illusion that he enters the text directly to the display screen in the cursor position. Where it does not lead to controversy, this analogy may be used in the explanation. However, in the rigorous definitions in the descri
REFERENCES:
patent: 5105375 (1992-04-01), Lapeyre
patent: 5283560 (1994-02-01), Bartlett
patent: 5581243 (1996-12-01), Ouellette et al.
Ryzhov Vladimir Alexandrovich
Trofimov Sergei Viktorovich
Saras Steven J.
Wu Xu-Ming
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