Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements
Patent
1996-05-29
1998-03-10
Bayerl, Raymond J.
Computer graphics processing and selective visual display system
Display driving control circuitry
Controlling the condition of display elements
345132, G06T 160
Patent
active
057271917
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a monitor adapter. More particularly, the present invention relates to a monitor adapter connected between a personal computer and a video monitor for carrying out a relay to transmit information required for Plug and Play to the personal computer and to transmit an optimal video signal for the video monitor from the personal computer to the video monitor.
BACKGROUND ART
In an IBM PC/AT compatible personal computer, the irreducible minimum functions are provided for a main body thereof in order to utilize open architecture, and various functions can be added to the main body in the form of boards for user's specific demands in order to allow for selection by the user. This board is called an add-on board. At present, the add-on boards include a video card, an SCSI card (one of the interface standards for external storage apparatuses), a net work card, a sound source board and the like.
However, the add-on boards are put on the market by manufacturers other than those of personal computers, based on inconsistent standards established by themselves, and therefore, the user often cannot operate a personal computer without knowledge thereof even if the user purchases peripheral equipment and an add-on board and tries to connect them with the personal computer, which is serious problem of a personal computer.
Thus, recently, all the hardware (such as an add-on board and an external apparatus) connected to a personal computer has been basically increasingly made to have functions to communicate with an OS under a prescribed rule, to notify the OS of its own function and performance according to the request of the OS, and to reset itself based on arbitration of the OS. With these functions, optimal setting is performed automatically, and the user can use a personal computer without difficulty even if he/she knows nothing about computers. More specifically, this method allows the user to operate a personal computer by merely selecting a function by himself/herself and inserting an add-on board thereinto, which is called Plug and Play, so that convenience on the part of the user can be improved.
By the way, a recent personal computer can output a high resolution image signal, and a display system capable of displaying such a high resolution image and of carrying out Plug and Play has been proposed as a video monitor in the U.S. Pat. No. 5,276,458.
FIG. 5 is schematic block diagram showing the proposed display system described above. In FIG. 5, an ROM 81, a memory 82, an I/O 84, a communication adapter 85, a keyboard adapter 90 and a display adapter 92 are connected to a CPU 80 through a bus 86. A keyboard 91 is connected to keyboard adapter 90, and these components from CPU 80 to keyboard adapter 90 constitute a computer in a well-known manner. An external disk file 83 is connected to I/O 84, and communication adapter 85 transmits and receives data to and from a host computer 93.
Display adapter 92 performs a Plug and Play function for a CRT display apparatus 88. More specifically, display adapter 92 outputs a video signal and a synchronization signal to an output port 94 for enabling display apparatus 88. Display apparatus 88 includes a non-volatile memory 9 and device logic 97, and device logic 97 is connected to adapter logic 96 in display adapter 92 through a serial line 3. Non-volatile memory 9 stores display information, and adapter logic 96 and device logic 97 constitute communication logic 95. Adapter logic 96 applies a command for read data and write data of non-volatile memory 9 to device logic 97 through serial line 3, and device logic 97 responsively accesses non-volatile memory 9 to read display information therefrom, and supplies the display information to adapter logic 96 through serial line 3. Adapter logic 96 supplies RGB data to display apparatus 88 such that display apparatus 88 operates in a mode adapted to itself.
In the example shown in FIG. 5, however, display adapter 92 cannot be connected to display apparatus 88 so as to display an
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patent: 4991023 (1991-02-01), Nicols
patent: 5038301 (1991-08-01), Thoma, III
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Konishi Kazuhiro
Ono Masaki
Bayerl Raymond J.
Nanao Corporation
Nguyen Cao H.
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