Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1995-03-02
1997-03-04
Weldon, Ulysses
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345112, G09G 522
Patent
active
056084250
ABSTRACT:
A new technique for generating OSD characters is disclosed having a system architecture which utilizes a minimum of hardware and which is primarily implemented through software. The technique of the present invention incorporates the use of a microprocessor which is utilized to store and transfer video data to and from a plurality of logic circuits which make up the OSD system. One aspect of the present invention is directed to a clock switching device which drives both the CPU and other logic circuits of OSD system. The switching device is responsive to at least one control signal for providing an output clock signal which is switchable between two clock signals. Another aspect of the present invention is directed to a technique for altering the font size of the characters displayed on a kinescope. Specifically, the present invention is able to expand the width of the various characters displayed on the screen without altering the frequency of a DOT clock signal, as is done in conventional OSD systems. Another aspect of the present invention is directed to a technique for synchronizing the microprocessor, OSD logic circuits, and color electron gun driver in order to avoid jitter of OSD characters. This synchronization technique is accomplished through the use of a HALT signal provided to the microprocessor which allows the microprocessor to finish executing its current instruction, but prohibits the microprocessor from beginning a next instruction. After a sufficient amount of time has passed to ensure that the microprocessor has completed its current instruction, an OSD interrupt signal is sent to the microprocessor instructing the microprocessor to begin OSD operations.
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Weldon Ulysses
Zilog Inc.
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