US 5,351,064 AGranted

CRT/flat panel display control system

AssigneeKabushiki Kaisha Toshiba

InventorHiroki Zenda

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Abstract

According to this invention, in a display system having a CRT controller for arbitrarily and selectively display-driving a plasma display and a CRT display, display fonts inherent to the displays are prepared, and a display font corresponding to the display is selectively used and displayed in accordance with a display to be display-driven. The fonts include a plurality of types of graphics and text fonts, and are selectively used. As the text font, a single font and a double font are selectively used. When a display mode of the plasma display having a ratio of the number of dots in the vertical direction to that in the horizontal direction different from that of the CRT display is set, a specific raster of the display screen is scanned twice to stretch an image.

Claims5

Dependent claims

A display control system for a flat panel display apparatus wherein said display control system may also optionally be used for a CRT display apparatus and wherein said display control system is coupled to a VRAM, each of said display apparatus having a display screen and having a capability to generate, from display data stored in the VRAM, a display image in a selected one of a plurality of display resolutions each having a resolution data and each including a plurality of raster lines, said display control system including a display controller for alternately driving said flat panel display apparatus and said CRT display apparatus in a plurality of display modes, including a stretch-enable display mode, said display control system comprising:

stretch designation means for generating a stretch instruction that the display image to be generated on said display screen of said flat panel display apparatus be stretched;
first storage means for storing the stretch instruction;
second storage means for storing data for use in determining whether the display image can be stretched;
discriminating means for discriminating, in response to the stretch instruction stored in said first storage means and based on the data stored in said second storage means, whether the display image of said flat panel display apparatus can be stretched when the display image is to be generated on said display screen of said flat panel display apparatus;
and
image stretch means for, when said discriminating means discriminates that the display image can be stretched, reading and displaying display data from the VRAM a plurality of times at evenly distributed intervals so as to add at least one extra raster line to said display image, thereby stretching said display image.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/165,524Filed 13 Dec 1993 · continuation
Priority: JP 62-15270119 Jun 1987
Granted: 27 Sep 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

G09G 3/28
Using controlled light sources: using luminous gas-discharge panels, e.g. plasma panels
G06F 3/1431
Controlling a plurality of local displays, e.g. CRT and flat panel display: using a single graphics controller
G09G 5/227
Control of the character-code memory: resolution modifying circuits, e.g. variable screen formats, resolution change between memory contents and…
G09G 5/366
Graphics controllers: with conversion of CRT control signals to flat panel control signals, e.g. adapting the palette memory

Family

Serial207,986Parent of this continuation · filed 17 Jun 1988
Serial517,443Parent of this continuation · filed 25 Apr 1990
Serial652,392Parent of this continuation · filed 6 Feb 1991
Serial882,256Parent of this continuation · filed 8 May 1992
US 5,351,064 AThis patent

From the US filing history. Foreign family members aren’t listed.

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