Display terminal device

Details Display terminal device Display terminal device

1990-02-01

1992-07-28

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340708, G09G 512

Patent

active

051343894

ABSTRACT:
A display terminal and apparatus for detecting the position of a light pen detecting field on a display surface at times the light pen is pointed to the light pen detecting field is described incorporating a column counter, scanning line counter, character row counter, light pen detecting field counter, and a light pen detecting line counter interconnected with an address generator, decoder, character code buffer, attribute buffer, font memory, light pen detection line generator mask line generator and scanning type display device. The invention overcomes the problem of misjudging the column address arising from variable delay times of the sensor signal from a light pen pointed to and sensing light from a display surface.

REFERENCES:
patent: 3832693 (1974-08-01), Ishizaki et al.
patent: 4146880 (1979-03-01), Arizabalaga
Patent Abstract of Japan, vol. 5, No. 169, (P-086), Oct. 28, 1981; & JP-A-56 096 320 (Fujitsu Ltd.) Apr. 8, 1981; entitled "Light Pen Detecting System", by Noda Katsunobu.

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