Title:
CIRCUIT DEVICE FOR CONTROLLING CATHODE RAY TUBE BEAM
Document Type and Number:
Japanese Patent JPS58126589
Kind Code:
A
Abstract:
Beam characteristics, including writing speed, slope, position and intensity, are controlled by circuitry which includes a single digital-to-analog converter (210) sample-and-hold circuitry (250, 260, 270) and a pair of active integrator circuits (280, 290). A microprocessor is adapted to control these circuit components. A data multiplexer (230) selectively applies the DAC output to a preselected sample-and-hold circuit means. The microprocessor is operative to provide digital words to the DAC representative of the differential X and Y values of a line segment to be drawn. The analog representations of these digital words are coupled to the integrators. The outputs of the active integrators provide the deflection signals causing deflection of the CRT beam. The apparatus is particularly adapted to drawing a series of connected line segments, due to the integrator operation. A line segment length may be scaled simply by varying the time interval the analog signals are applied to the integrators, while the writing speed remains constant. The apparatus can also be adapted to display a pseudo-raster scan field.
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Inventors:
JIEI SUMISU ZA SAADO
JIERARUDO ESU KAA
JIERARUDO ESU KAA
Application Number:
JP74583A
Publication Date:
July 28, 1983
Filing Date:
January 05, 1983
Export Citation:
Assignee:
MIRUTON BURATSUDORII CORP
International Classes:
G09G1/07; G09G1/12; (IPC1-7): G09G1/08
Attorney, Agent or Firm:
Aoyama