Browse Prior Art Database

Repair Method of Lit Pixels in Liquid Crystal Displays

IP.com Disclosure Number: IPCOM000118479D
Original Publication Date: 1997-Feb-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Kobayashi, S: AUTHOR [+4]

Abstract

Disclosed is a repair method of lit pixels in liquid crystal displays by means of injecting organic solvent, on the surface of a polarizer located on a reverse glass substrate. The incident rays are scattered or shaded in the dissolved hole in the polarizer made by the injection of organic solvent, such as acetone, and which can moderate the light transparency. The quantity of injected organic solvent can be controlled by the pressure of the injection in a micro-syringe, in accordance with the degree of lit pixel. If a color dye, such as carbon black, is added into the organic solvent, the effectiveness of shading can be improved.

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Repair Method of Lit Pixels in Liquid Crystal Displays

      Disclosed is a repair method of lit pixels in liquid crystal
displays by means of injecting organic solvent, on the surface of a
polarizer located on a reverse glass substrate.  The incident rays
are scattered or shaded in the dissolved hole in the polarizer made
by the injection of organic solvent, such as acetone, and which can
moderate the light transparency.  The quantity of injected organic
solvent can be controlled by the pressure of the injection in a
micro-syringe, in accordance with the degree of lit pixel.  If a
color dye, such as carbon black, is added into the organic solvent,
the effectiveness of shading can be improved.

      The Figure shows an example of this repair method.  The
cross-sectional structure of the Thin-Film Transistor Liquid Crystal
Display (TFT-LCD) is shown as a schematic illustration.  The incident
ray is transmitted to a polarizer (6), glass substrate (5), pixel
electrode (8), liquid crystal (4), common electrode (3), color filter
(7), glass substrate (2), and polarizer (1) if the TFT is off in a
normally white mode.  TFTs are located on the reverse glass substrate
(5).  The dissolved hole is formed on the polarizer (6) of the lit
pixel by the injecting organic solvent using the micro-syringe, in
which the TFT is not active.  Therefore, the incident ray is
scattered or shaded in that hole and the lit pixel can be moderated
to the unlit pixel (indicated by the arro...