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Capacitance Compensation Method for Shot Boundaries of Active Matrix-Liquid Crystal Display

IP.com Disclosure Number: IPCOM000118649D
Original Publication Date: 1997-Apr-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 4 page(s) / 155K

Publishing Venue

IBM

Related People

Ikezaki, M: AUTHOR [+2]

Abstract

Disclosed is a pixel design method to reduce the visibility of shot boundaries of Active Matrix Liquid Crystal Displays (AM-LCD).

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This is the abbreviated version, containing approximately 100% of the total text.

Capacitance Compensation Method for Shot Boundaries of Active Matrix-Liquid
Crystal Display

      Disclosed is a pixel design method to reduce the visibility of
shot boundaries of Active Matrix Liquid Crystal Displays (AM-LCD).

      One piece of AM-LCD is manufactured by several photolithography
shots.  Fig. 1 shows two of the most important pixel characteristics:
  1.  the capacitance between the pixel electrode and the
       signal line (Cis)
  2.  the capacitance between the pixel electrode and the
       gate line (Cgs)

      Different shots often result in different Cis and
Cgs, and these different capacitances result in different pixel
brightness.  Consequently, the boundary between two shots is often
visible as a boundary of different color areas.

      Fig. 2 shows the new pixel design method.  To reduce the
boundary visibility caused by different Cgs, both shots have a
mosaic-like boundary.  To reduce the boundary visibility caused by
different Cis, the proportion of shots in a pixel is gradually
changed, and the right Cis and the left Cis of a pixel is always
balanced for each shot (Fig. 3).  Since the ratio of the brightness
of red, green, and blue AM-LCD pixels is about 25 : 55 : 20, making
shot boundaries only on red and blue pixels also reduces the boundary
visibility.