Computer graphics processing and selective visual display system – Plural display systems – Diverse systems
Patent
1994-01-28
1996-02-27
Hjerpe, Richard
Computer graphics processing and selective visual display system
Plural display systems
Diverse systems
345 99, 345213, G09G 336
Patent
active
054952638
ABSTRACT:
A method that identifies the type of LCD panel used in a portable computer system based on the frequency of the oscillator signal of the DC-to-AC inverter in the LCD panel. In this method, only one signal is routed from the LCD panel to the base unit of the portable computer system for the purpose of panel identification. The inverter oscillating signal is used to increment a counter during power on operations. A system counter, which is clocked by a system clock, is used to determine the number of system clocks needed for the panel identification counter to reach a predetermined count. That number is compared with the entries of a table, in which each entry corresponds to a type of LCD panel. In this manner, the type of LCD panel can be identified based on the frequency of the inverter signal. A corresponding entry in a second table is accessed to obtain a table entry for the identified LCD panel to a full table of LCD panel parameters. The table entry is stored in a predetermined location in the Video ROM. During the video power on portion of the BIOS, the video BIOS routines access the predetermined location in the Video ROM to obtain the parameters to properly initialize the video controller.
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patent: 4855728 (1989-08-01), Mano et al.
patent: 4908842 (1990-03-01), Collins
patent: 5184059 (1993-02-01), Patino et al.
patent: 5262759 (1993-11-01), Moriconi et al.
patent: 5355073 (1994-10-01), Nguyen
`Monitor Identification Technique`, IBM Technical Disclosure Bulletin, vol. 30, No. 2, Jul. 1987 New York, US, pp. 839-840.
`Display Controller Set Up as a Function of Display Monitor Type, Display Jumber Settings and Amount or VRAM`, IBM Technical Disclosure Bulletin, vol. 33, No. 2, Jul. 1990 New York, US, pp. 352-353.
Dalton Scott W.
Metz Doyne L.
Compaq Computer Corp.
Hjerpe Richard
Saras Steven J.
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