Graphic display device

Claim 2

A graphic display system for controlling the graphical display of information in a coordinate scanning pattern capable of generating a plurality of horizontal scanning lines, each scanning line being made up of a plurality of information positions, and a plurality of scanning lines forming a display group, said graphic display system comprising memory means for storing information representing a length and one of a negative and positive sign of an increment of each display group, means for counting a plurality of timing pulses designating the timing characteristics of said scanning pattern, the timing pulses being representative of predetermined information positions and predetermined scanning lines of said scanning pattern, means for generating signals foR controlling the display of the coordinate axes of the graph, start position control means for providing a value representative of the information position on each scanning line at which display is to be started, stop position control means for providing a vlaue representative of the information position on each scanning line at which display is to be stopped, and processing control means for controlling said start and stop position control means in response to the information stored in said memory means, said start position of each scanning pattern being determined by the information positions of the previously scanned and displayed pattern, and the length of said scanning pattern on each scanning line being equal to the length of the increment of a respective display group.

Claim 3

A graphic display system as defined in claim 1, wherein said start position control means provides a signal for initiating display when said value representative of the information position on which display is to be started is obtained and said stop position control means provides a signal for stopping display when said value representative of the information position on which display is to be stopped is obtained.

Claim 4

A graphic display system as defined in claim 1, wherein said coordinate axes generating means includes a first register for storing digital information values representing a starting point of the coordinate axes in the X direction, a second register for storing digital information values representing a starting point of the coordinate axes in the Y direction, a third register for storing digital information values representing a length of the axes in the X direction, a fourth register for storing digital information values representing a length of the axes in the Y direction, a first comparator providing a first output upon coincidence between the values in said first register and a first counter means of said counting means for counting the timing pulses corresponding to the information positions in each scanning line, a second comparator providing a second output upon coincidence between the values in said second register and a second counter means of said counting means for counting the timing pulses corresponding to said scanning lines, a third comparator providing a third output upon coincidence between the values in said third register and third counter means of said counting means for counting the timing pulses corresponding to the information positions in each scanning line, and a fourth comparator providing a fourth output upon coincidence between the values in said fourth register and a fourth counter means of said counting means for counting the timing pulses corresponding to said scanning lines.

Claim 5

A graphic display system as defined in claim 3, wherein said third counter means begins to count the timing pulses in response to the first output from said first comparator, and said fourth counter means begins to count the timing pulses in response to the second output from said second comparator.

Claim 6

A graphic display system as defined in claim 4, wherein said coordinate axes generating means further includes a first flip-flop connected to said first comparator and to said third comparator so as to be set by said first output from said first comparator and to be re-set by said third output from said third comparator, a second flip-flop connected to said second comparator and said fourth comparator so as to be set by said second output from said second comparator and to be re-set by said fourth output from said fourth comparator, a first gate through which said timing pulses corresponding to the information position in each scanning line are transferred to said third counter means when said first flip-flop is set, and a second gate through which said timing pulses corresponding to scanning lines are transferred to said fourth counter means when said second flip-flop is set.

Claim 7

A graphic display system as defined in claim 5, wherein said coordinate axes generating Means further includes a third gate having input terminals connected to said first flip-flop and to said second comparator and an output terminal is connected to an OR gate, a fourth gate having input terminals connected to said second flip-flop and to said first comparator and an output terminal connected to said OR gate.

Claim 8

A graphic display system as defined in claim 1, wherein said processing control means includes means for providing clock pulses spaced to correspond in time to correspond to scanning positions forming a subdivision of said information positions, said counting means counts said clock pulses, said start position control means includes a fifth register for storing the value representative of the start scanning position on each scanning line and a fifth comparator providing a fifth register and values in a fifth counter means of said counting means, said stop position control means includes a sixth register for storing the value representative of the stop scanning position on each scanning line and a sixth comparator providing a sixth output coincidence between said sixth register and said value in said fifth counter means, said fifth counter means counting the timing pulses corresponding to the scanning positions in each scanning line.

Claim 9

A graphic display system as defined in claim 7, further including a third flip-flop connected to said fifth and sixth comparators so as to be set by the output of said first comparator and reset by the output of said second comparator, said third flip-flop providing a set output which is utilized as a display brightening signal.

Claim 10

A graphic display system as defined in claim 8, wherein said processing control means includes arithmetic control means for algebraically adding data values from said memory means to said stop position control means or said start position control means prior to each line scan depending upon whether the data values are positive or negative, repsectively.

Claim 11

A graphic display system as defined in claim 9, wherein said processing control means includes further means for shifting the value in said stop position control means to said start position control means at the end of a line scan when the next data value in said memory means is positive and shifting the value in said start position control means to said stop position control means at the end of a line scan when the next data value in said memory means is negative.

Claim 12

A graphic display system as defined in claim 10, wherein said arithmetic control means includes a full adder circuit and a full subtractor circuit.

Claim 13

A graphic display system for controlling the graphical display of a predetermined pattern which is displayed in the form of a plurality of raster lines with a scanning point being scanned repeatedly along a predetermined path of said raster lines, a plurality of said raster lines forming a display group, said graphic display system comprising means for controlling the display of said pattern by controlling the unblanking positions of said raster lines, memory means for storing information representing a length and one of a negative and positive sign of an increment of each display group, means for counting a plurality of timing pulses representative of predetermined positions and predetermined raster lines of said pattern, a coordinate generating means for generating display signals for displaying the coordinate axes of the graph, said means for controlling the unblanking positions of said raster lines being responsive to said memory means and said counting means for calculating each position of an unblanking line portion in accordance with the increment of its respective display group which is the difference between the unblanking positions of one raster line and the following raster line of the display group, the length of the unblanking line portion being equal to the value of the increment of the display group.

Claim 14

A graphic display system for controlling the graphical display of a predetermined pattern which is displayed in the form of a plurality of raster lines with a scanning point being scanned repeatedly along a predetermined path of said raster lines, a plurality of said raster lines forming a display group, said graphic display system comprising means for controlling the display of said pattern by controlling the unblanking positions of said raster lines, memory means for storing information representing a length and one of a negative and positive sign of an increment of each display group, means for counting a plurality of timing pulses representative of predetermined positions and predetermined raster lines of said pattern, a coordinate generating means for generating display signals for displaying the coordinate axes of the graph, said means for controlling the unblanking positions of said raster lines being responsive to said memory means and said counting means for calculating each position of an unblanking line portion in accordance with the increment of its respective display group which is the difference between the unblanking positions of one raster line and the following raster line of the display group, the length of the unblanking line portion being equal to the value of the increment of the display group.

Claim 15

A graphic display device as defined in claim 12, wherein a display start point of each unblaNking line portion is determined by algebraically adding the difference between the unblanking positions to a display start point of said unblanking line portion on the previous raster line.

Claim 16

A graphic display device as defined in claim 12, wherein the length of the unblanking line portion on each raster line indicates the difference between the unblanking positions of its raster line and next raster line.

Claim 17

A graphic display system as defined in claim 12, wherein said memory means stores information values representative of a length of unblanking line portion on each raster line and information signals representative of an increase or decrease signal of pattern position on each raster line, said means for controlling the unblanking positions including means for connecting a display start point of the unblanking line portion to be displayed to a display stop point of the unblanking line portion which has already displayed in case of an increase signal and for connecting a display stop point of said unblanking line portion to be displayed to a display start point of the unblanking line portion which has already displayed in case of a decrease signal.

Claim 18

A graphic display system as defined in claim 15, further including a display plane formed of a plurality of display groups said length of unblanking line portion on each raster line and said increase or decrease signal being the same in a respective group.

Claim 19

A graphic display system as defined in claim 16, wherein said means for controlling the unblanking positions includes a start position control means having a first register for storing a starting point digital information value at which display of the unblanking line portion is to be started and a stop position control means having a second register for storing a stopping point digital information value at which said display of the unblanking line portion is to be stopped, the digital information value of said second register of said stop position control means being transmitted to said first register of said start position control means from said second register, and said second register storing a new digital information value determined by adding the value representative of the length of said unblanking line to a value of said second register when the increments of the last unblanking line portion of the previously scanned line and the unblanking line portion of the previously scanned line and the unblanking line portion to be displayed have an increase signal, and the digital information value of said first register of said start position control means being transmitted to said second register of said stop position control means from said first register, said first register storing a new digital information value determined by subtracting said length of said unblanking line from the value of said first register when said increments of the last unblanking line portion of the previously scanned line and the unblanking line portion to be displayed have a decrease signal.