Compensation method and circuitry for flat panel display

• US 5,285,192 A
• Filed: 12/30/1991
• Issued: 02/08/1994
• Est. Priority Date: 09/16/1988
• Status: Expired due to Term

• Current Assignee: Intel Corporation
• Original Assignee: Chips and Technologies, Inc. (Intel Corporation), Ascii Corp. (Kadokawa Dwango Corp.)
• Inventors: Johary, Arun, Oguchi, Tetsuji
• Primary Examiner(s): HJERPE, RICHARD A
• Application Number:
  US07/815,840
• Time in Patent Office: 771 Days
• Field of Search: 340/716, 340/717, 340/723, 340/731, 340/735, 340/771, 340/784, 340/793, 340/812, 340/790, 340/805
• US Class Current: 345/699
• CPC Class Codes: G06F 3/1475 with conversion of CRT control signals to flat panel control signals, e.g. adapting the palette memory
• CPC Class Codes: G09G 2340/0414 Vertical resolution change
• CPC Class Codes: G09G 2340/0471 Vertical positioning
• CPC Class Codes: G09G 2340/0478 Horizontal positioning
• CPC Class Codes: G09G 2340/0485 Centering horizontally or vertically

Abstract

A video controller for a personal computing system. The controller compensates CRT video information to generate a display compatible with a flat panel device. The controller includes registers and logic circuits which compensate CRT address information. The compensated addresses are used to repeat lines of display, insert blank lines between lines of display, center a display, and force font types.

Claims

1. In a data processing system having a computer means for processing information, a memory means for storing information, and a video display system for generating and displaying video display information, wherein the video display information is displayed on one of at least two predetermined types of video display means, the video display system comprising:

display means;

means, coupled to the display means, for determining a size of said display means;

display indicating means coupled to the display means for indicating which type of display means is capable of displaying video display information;

a first set of register means containing video display configuration information for a first type of predetermined display means, the video configuration information enabling the first type of display means to display the video display information in any one of a predefined set of display modes;

a second set of register means containing video display modification information for a second predetermined display type, the video display modification information used for modifying the video display configuration information stored in the first set of register means to enable the display means to display the video display information for a second predetermined display type in any one of the same predefined set of display modes;

controller means coupled to the display means, the display size determining means, the display indicating means, the first set of register means, the second set of register means, the computer means and the memory means, the controller using the video display configuration information in the first set of register means to convert the information in the computer and memory into video display information for the display means when the display means of the first predetermined type is capable of displaying video display information and the controller using the video display configuration information in the first set of register means and the modification information in the second set of register means to convert the information in the computer and memory into video display information for the display means when the display means of the second predetermined type is capable of displaying video display information and the size of the display means of the first predetermined type is different from the size of the display means of the second predetermined type.

2. The video display system of claim 1 wherein the first predetermined type of display is a cathode ray tube means and the second predetermined type of display means is a liquid crystal display means.

3. The video display system of claim 1 wherein the first predetermined type of display is a cathode ray tube means and the second predetermined type of display means is a digital flat panel display means.

4. The video display system of claim 1 wherein the predefined set of display modes comprises 17 display modes.

5. The video display system of claim 3 wherein the predefined set of display modes comprises 17 display modes.

6. The video display system of claim 1 wherein the modification information in the second set of register means comprises at least centering information, line repeating information, and blank line insertion information.

7. The video display system of claim 5 wherein the modification information in the second set of register means comprises at least centering information, line repeating information, and blank line insertion information.