Image size adjusting apparatus for a digital display monitor

Details Image size adjusting apparatus for a digital display monitor Image size adjusting apparatus for a digital display monitor

1997-07-02

1998-10-06

Luu, Matthew

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

348581, G09G 500

Patent

active

058184163

ABSTRACT:
An image size adjusting apparatus for a digital display monitor using a liquid crystal display (LCD) panel includes a frequency multiplier circuit having a programmable divider, and six line memories in which two line memories are designated per each color picture signal line. The adjustment of the horizontal size of the display image can be achieved by changing the amount of sampling data in cooperation with the PLL circuit and the programmable divider. Also, adjustment of the vertical size can be achieved by changing the number of scanning lines such that double scanning is performed during one period of the horizontal synchronization signals, using the line memories. Thus, the apparatus provides for a simplification of adjusting operations of the horizontal and vertical image size of a digital display monitor.

REFERENCES:
patent: 4916747 (1990-04-01), Arimoto
patent: 5068731 (1991-11-01), Takeuchi
patent: 5406308 (1995-04-01), Shiki
patent: 5422678 (1995-06-01), Takeuchi
patent: 5457473 (1995-10-01), Arai et al.
patent: 5532716 (1996-07-01), Sano
patent: 5555027 (1996-09-01), Takeuchi

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