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US 5,736,971 AGranted
Method and apparatus for increasing resolution of a computer graphics display
AssigneeMelco Inc.
InventorSatoru Shirai
Life of this patent
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AssigneeMelco Inc.
InventorSatoru Shirai
Estimating the term…
The graphic board can be mounted inside the expansion slot of the computer, and the frequencies of the horizontal synchronizing signal and the vertical synchronizing signal can be preset finely through presetting the values on the registers from the computer side. At the start of display, the display is carried out in synchronizing frequencies corresponding to the original 640 dots by 400 lines display of the CRT display device (step S100) Then, the synchronizing frequencies are increased gradually to the target values corresponding to the 640 dots by 480 lines display (steps S120 through S140). During this time, the CRT display device will continue synchronization against fluctuation of the frequency within an allowable range with the operation of an internal synchronization circuit. Consequently, the CRT display device can maintain synchronization all through to the target values, and thus a 640 dots by 480 lines display is available.
A graphic display controller device for increasing the apparent resolution of an external display device having a designated resolution having a designated number of lines and a designated number of pixels per line associated therewith, the graphic display controller device being arranged to output a video signal containing display information for a number of pixels, a horizontal synchronizing signal and a vertical synchronizing signal to the external display device wherein the number of pixels of display information in the video signal is larger than a number of designated pixels in said external display device, said graphics display controller device comprising:
A computer having a graphic display controller device for outputting a video signal comprising a horizontal synchronizing signal and a vertical synchronizing signal for displaying an image on an external display device wherein the number of pixels of display information in the video signal is larger than a number of designated pixels in said external display device, the graphic display controller device is mounted on an expansion board suitable for insertion into an expansion slot accessible by a processor, wherein said graphics display device comprises;
A method of controlling a graphic display assembly wherein a video signal containing a horizontal synchronizing signal and a vertical synchronizing signal is outputted to display a image on the display assembly such that the resolution of the display assembly is increased relative to a designated display resolution by increasing at least one of the number of display lines and the number of pixels per line, said method comprising the steps of:
Dependencies are inferred from the claim text.