Browse Prior Art Database

Border/ Video Area Double Reverse Function

IP.com Disclosure Number: IPCOM000035966D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Itoh, H: AUTHOR

Abstract

Disclosed is a LCD controller which can make the Border/Video area of an LCD panel double reversible among four kinds of color (white/black) combinations. This function is programmable to meet the color (white/ black) requested by software or the user.

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Border/ Video Area Double Reverse Function

Disclosed is a LCD controller which can make the Border/Video area of an LCD panel double reversible among four kinds of color (white/black) combinations. This function is programmable to meet the color (white/ black) requested by software or the user.

When the video data for a screen size of "640 x 400" dots or "640 x 350" dots is displayed on a LCD panel of which the frame size is "640 x 480" dots, the border area and video area would be provided on the screen, as shown in Fig. 1. According to this invention, these areas can take possibly four kinds of color (white/black) combinations, as shown in (a) to (d) of Fig. 2.

Referring to Fig. 3, a block diagram of the border/video area, a double reverse function is shown. At the point A, the signals for the border area can get black because the serial pel data is provided with

(Image Omitted)

a BLANK signal. If the "video area reverse switch" is set at "0", the signals at A for the video area also become black. On the other hand, if the "video area reverse switch" is set at "1", the signals become white for the video area.

If the "border area reverse switch" is set at "0", the output of the LCD controller is supplied to the LCD panel as it is. If the "border area reverse switch" is set at "1", the output of the LCD controller is reversed through the Exclusive- OR gate.

Finally, four kinds of color (white/black) combinations, as in (a) to (d) of Fig. 2, can be provided on the...