Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1995-06-28
1998-02-24
Saras, Steven
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345194, 395167, G09G 524
Patent
active
057215685
ABSTRACT:
An improved font ROM control circuit for an on-screen display capable of performing a function of an on-screen display RAM using an address ROM by storing a coded character address and a coded character color data in a plurality of address ROMs and to selectively output data, thereby to cope with an increasing needs of an on-screen display RAM having a large space, which includes an address signal generation circuit for outputting a readout address signal; an on-screen display RAM for storing a character address and a character color data of a character data in according to a record address signal outputted from a central processing unit and for outputting a previously stored character address and a character color data in accordance with a readout address signal; an address ROM for outputting character addresses and character color data in accordance with a readout address signal outputted from the address generation circuit; a memory selection register for outputting a memory selection signal so as to select a character address and for outputting a color memory selection signal so as to select a character color data; and a multiplexer for selecting character addresses and character color data outputted from the on-screen display ROM and the address ROM, respectively, in accordance with a memory selection signal and a character memory selection signal which are outputted from the memory selection register and for outputting the selected character addresses and character color data to a column selection signal generation circuit and an output control circuit, respectively.
REFERENCES:
patent: 4595996 (1986-06-01), Morley et al.
patent: 4737779 (1988-04-01), Somigli et al.
patent: 4864518 (1989-09-01), Kurita
patent: 4954979 (1990-09-01), Eibner et al.
patent: 5367317 (1994-11-01), Hosotani
patent: 5467109 (1995-11-01), Nagaoka
LG Semicon Co. Ltd.
Saras Steven
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