公开(公告)号：CA1113611A

公开(公告)日：1981-12-01

申请号：CA287759

申请日：1977-09-29

Applicant: IBM

Inventor： HALLETT MICHAEL H ,  SOWTER BRIAN R ,  HENEGHAN MICHAEL J

IPC: G06F3/153 ,  G09G1/00 ,  G09G1/04 ,  G09G1/28 ,  G09G5/30 ,  H04N3/23 ,  H04N9/28 ,  H04N9/09

Abstract: IMPROVEMENTS IN CATHODE RAY TUBE APPARATUS A three colour gun cathode ray tube has convergence correction signals derived from digital signals stored in a digital data store. The screen of the tube is divided into a plurality of areas and a digital correction signal derived for each area. The system is arranged so that when the three beams are scanning a particular area the digital correction signal associated with that area is read out from the digital store, passed through a digital to analogue converter and then applied to the convergence coils of the tube.

公开(公告)号：FR2403703A1

公开(公告)日：1979-04-13

申请号：FR7821339

申请日：1978-07-12

Applicant: IBM

Inventor： SOWTER BRIAN R

IPC: H01J9/44 ,  H04N9/28 ,  H04N17/04 ,  H01J29/51

公开(公告)号：CA1113610A

公开(公告)日：1981-12-01

申请号：CA303890

申请日：1978-05-23

Applicant: IBM

Inventor： SOWTER BRIAN R

IPC: H01J9/44 ,  H04N9/28 ,  H04N17/04 ,  H04N9/09

Abstract: IMPROVEMENTS IN METHODS OF GENERATING CORRECTION FACTOR SIGNALS FOR CATHODE RAY TUBES A method of convergence correction in a three beam colour cathode ray tube dividing the screen into a plurality of discrete areas. Digital values for convergence factor signals are derived for a predetermined number of the discrete areas and a spreading algorithm is used to derive digital values for the remaining areas. The resulting digital values are stored in a digital store and used to provide convergence correction factor signals during operation of the tube.

公开(公告)号：CA1104730A

公开(公告)日：1981-07-07

申请号：CA311730

申请日：1978-09-21

Applicant: IBM

Inventor： ROE DAVID ,  SOWTER BRIAN R

IPC: G06F3/153 ,  G06F17/21 ,  G06T11/00 ,  G09G5/02 ,  G09G5/06 ,  G09G5/40 ,  H01S3/22

Abstract: CHARACTER GRAPHICS COLOUR DISPLAY SYSTEM Mixed colour effects in a character graphics display system are achieved by providing font characters comprising several character cells with different patterns which can selectively be read simultaneously to different colour registers, thereby determining the colour in which each character cell is to be displayed. The system also provides characters comprising only a single character cell which can selectively be directed to any of the colour registers. A control system interprets colour bits in a control word in accordance with the type of character being accessed. UK9-77-010

公开(公告)号：FR2375668A1

公开(公告)日：1978-07-21

申请号：FR7734663

申请日：1977-11-10

Applicant: IBM

Inventor： SOWTER BRIAN R ,  HALLETT MICHAEL H ,  HENEGHAN MICHAEL J

IPC: G09G1/00 ,  G09G1/04 ,  G09G1/28 ,  G06F3/153 ,  G09G5/30 ,  H04N3/23 ,  H04N9/28 ,  G06K15/20 ,  H04N3/26

Abstract: A three color gun cathode ray tube has convergence correction signals derived from digital signals stored in a digital data store. The screen of the tube is divided into a plurality of areas and a digital correction signal derived for each area. The system is arranged so that when the three beams are scanning a particular area the digital correction signal associated with that area is read out from the digital store, passed through a digital to analog converter and then applied to the convergence coils of the tube.

公开(公告)号：CA1111486A

公开(公告)日：1981-10-27

申请号：CA310049

申请日：1978-08-25

Applicant: IBM

Inventor： SOWTER BRIAN R ,  WARWICK WILLIAM A

IPC: H01J29/54 ,  H01J29/70 ,  H01J29/82 ,  H04N9/28 ,  H01J31/02

Abstract: CONVERGENCE ASSEMBLY FOR CATHODE RAY TUBE An electromagnetic lateral convergence assembly includes a generallyannular, planar magnetic core (optionally found as a laminate) having six integral pole pieces extending towards the centre of the annulus. Electrical coils are mounted on selected polepieces for producing a convergence-compensating magnetic field within the centre of the annulus. The coils are secured to a printed circuit board to hold the core in spaced parallel relationship to the board. Optionally a purity assembly including a planar magnetic core having a number of electrical coils for producing a rotatable, variable, linear field is mounted on the other side of the printed circuit board.

公开(公告)号：FR2411446A1

公开(公告)日：1979-07-06

申请号：FR7831285

申请日：1978-10-31

Applicant: IBM

Inventor： ROE DAVID ,  SOWTER BRIAN R

IPC: G06F3/153 ,  G06F17/21 ,  G06T11/00 ,  G09G5/02 ,  G09G5/06 ,  G09G5/40 ,  G06K15/20 ,  G09X ,  G11C8/00

Abstract: Mixed color effects in a character graphics display system are achieved by providing font characters comprising several character cells with different patterns which can selectively be read simultaneously to different color registers, thereby determining the color in which each character cell is to be displayed. The system also provides characters comprising only a single character cell which can selectively be directed to any of the color registers. A control system interprets color bits in a control word in accordance with the type of character being accessed.