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Browse Prior Art Database

Display Mode Detect and Setting for Flat Panel Controller

IP.com Disclosure Number: IPCOM000114207D
Original Publication Date: 1994-Nov-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Oie, M: AUTHOR [+2]

Abstract

A method and apparatus are disclosed which provide a means for automatically detecting video mode, and setting the operation parameters for the flat panel controller. This method detects the current video mode of CRT controller by using Horizontal SYNC, Vertical SYNC, Blanking and Dotclock. And it sets the corresponding operation parameters for flat panel controller which are pre-stored in the nonvolatile memory.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 87% of the total text.

Display Mode Detect and Setting for Flat Panel Controller

      A method and apparatus are disclosed which provide a means for
automatically detecting video mode, and setting the operation
parameters for the flat panel controller.  This method detects the
current video mode of CRT controller by using Horizontal SYNC,
Vertical SYNC, Blanking and Dotclock.  And it sets the corresponding
operation parameters for flat panel controller which are pre-stored
in the nonvolatile memory.

      Fig. 1 is the block diagram of this apparatus.  This method
detects video mode from its screen size.  Horizontal size is measured
by counting Dotclock during Blanking is in inactive.  Vertical size
is defined by polarity of Horizontal and Vertical SYNC.  This
vertical size definition is standardized as in the Table.  From these
size of screen, encoder generates a address of nonvolatile memory.
The apparatus restores the the corresponding operational parameters
by using this address.

      As saying above, the mode detecting method of this apparatus is
using digital signals which are directory supplied from CRT
controller.  So, the circuit of this apparatus become so simple.

      Fig. 2 is the typical usage of this apparatus.  With this
apparatus, flat panel controller can be easily attached to
conventional computer's display system.

      In this apparatus, operational parameters are stored in
nonvolatile memory.  It means that these parameters can be changed...