Refreshing circuit for multi-panel display

Details Refreshing circuit for multi-panel display Refreshing circuit for multi-panel display

1986-01-17

1988-05-03

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340717, 340792, 340802, G09G 116

Patent

active

047423471

ABSTRACT:
An addressing circuit for providing character addresses to refresh a plurality of panels arranged to display a single image and including a circuit for providing a character counter across character line and a circuit for providing a character line count for each panel. The character count across the character line and the character line count are combined in another circuit to provide an address for each character successively along a panel scan line alternating between each respective scan line of the panels. In this manner, each scan line of the panels may be addressed in an alternating fashion to provide the required refresh signal to maintain the image on the display. Another address circuit is provided for outputting a character font scan line address and includes a circuit that provides a character code date for each character successively along a panel scan line alternating between each respective scan line of the panels and another circuit that provides the scan line count for each character in the same manner. The character code data and scan line count for each character are combined to form the character font scan line address. This character font scan line address is input to a memory which provides the font scan line data to a video circuit. The character address is also used to address attribute data which is combined in the video circuit with the character font scan line data to produce a video refresh signal for the multi-panel display.

REFERENCES:
patent: 3777059 (1973-12-01), Wilkey, Jr.
patent: 3781850 (1973-12-01), Gicca et al.
patent: 3787834 (1974-01-01), Elliott
patent: 3816824 (1974-06-01), Thust et al.
patent: 4113381 (1978-09-01), Nakano
patent: 4462026 (1984-07-01), Munday
patent: 4630122 (1986-12-01), Morokawa
patent: 4642621 (1987-02-01), Nemoto et al.
patent: 4649379 (1987-03-01), Canton et al.
IBM Technical Disclosure Bulletin, "Liquid Crystal Display System", vol. 16, No. 4, Sep. 1973.

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