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Gradation Method for Active Matrix-Liquid Crystal Display and Color Filter Shot Boundaries

IP.com Disclosure Number: IPCOM000117183D
Original Publication Date: 1996-Jan-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 108K

Publishing Venue

IBM

Related People

Ikezaki, M: AUTHOR [+3]

Abstract

Disclosed is a design method which make the shot boundaries of the active matrix Liquid Crystal Display (AM-LCD) or Color Filter (CF) for AM-LCD harder to see. The characteristic of this method is that the pixels near the boundary in each shot are placed like a mosaic to create a gradation effect.

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Gradation Method for Active Matrix-Liquid Crystal Display and Color
Filter Shot Boundaries

      Disclosed is a design method which make the shot boundaries of
the active matrix Liquid Crystal Display (AM-LCD) or Color Filter
(CF) for AM-LCD harder to see.  The characteristic of this method is
that the pixels near the boundary in each shot are placed like a
mosaic to create a gradation effect.

      One piece of AM-LCD is manufactured by several photolithography
shots.  The characteristics of the transistors in each shot are
slightly different, so the boundary between 2 shots can be noticed by
users as a boundary of different color areas if a simple picture is
displayed.  To avoid this problem, the method to make the boundary
vague is necessary.

      The Figure shows the example for the new placement method of
the pixels around the boundaries of 2 shots.  Each square stands for
a pixel in this Figure.  The shot A is placed at the left side of the
boundary, and the shot B is placed at the right side of the boundary.
In the gradation area, each shot has a mosaic-like area of the
pixels.  Each pixel belongs to either the shot A or B, but not both.
The density of pixels of each shot is gradually changed from 0% to
100% according to the distance from the opposite shot.  Therefore,
the displayed color will be gradually changed from the left side to
the right side of the boundary because of a gradation effect, even if
the characteristics of 2 shots are differ...