Browse Prior Art Database

High Resistance Multiple Level Short Ring

IP.com Disclosure Number: IPCOM000123074D
Original Publication Date: 1998-May-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Takasugi, S: AUTHOR [+2]

Abstract

Disclosed is a circuit that protects active matrix liquid crystal display (AM-LCD) pixels from electrostatic discharges (ESD) without affecting the circuit that drives pixels.

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

High Resistance Multiple Level Short Ring

   Disclosed is a circuit that protects active matrix liquid
crystal display (AM-LCD) pixels from electrostatic discharges (ESD)
without affecting the circuit that drives pixels.

  Figure 1 shows short rings, which release electrostatic charges in
inner lines to the ground in order to avoid ESDs.  Figure 2 shows a
typical structure of a short ring.  When a high voltage is applied,
the resistance of the short ring transistors becomes low enough to
release electrostatic charges safely.

   Since more than 600 short rings are placed parallel, the
total resistance between the inner lines and the ground is less than
1/600 of the resistance of a short ring, which is too low to separate
the circuits effectively, even if the resistance of each short ring
is high.  The low total resistance causes the circuit voltages
fluctuate.

   Figure 3 shows a new structure of short rings.  The short
rings are placed in multiple levels in order to avoid the decrease of
the total resistance.  The resistance between an inner line and the
ground is still low enough to release electrostatic charges.