Browse Prior Art Database

Liquid Crystal Display

IP.com Disclosure Number: IPCOM000104723D
Original Publication Date: 1993-May-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Fukunaga, T: AUTHOR [+3]

Abstract

Described is a hybrid light shield frame (2) for liquid crystal displays which has metal shield layer between the X and Y drive line. Metal shield layer around display area (1) at one drive side is the same material as another side drive line. Different layer metals which have sufficient light shield efficiency consist light shield frame without any additional process. In case of black matrix on thin film transistor structure, overlaid organic black material, that is black photoresist or dyed polymer, improves light shield efficiency.

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Liquid Crystal Display

      Described is a hybrid light shield frame (2) for liquid crystal
displays which has metal shield layer between the X and Y drive line.
Metal shield layer around display area (1) at one drive side is the
same material as another side drive line.  Different layer metals
which have sufficient light shield efficiency consist light shield
frame without any additional process.  In case of black matrix on
thin film transistor structure, overlaid organic black material, that
is black photoresist or dyed polymer, improves light shield
efficiency.

      Fig. 1 shows an liquid crystal display using this method.  Y
drive line material (4) fills the space of X drive line (3), and X
drive line material (6) fills the space of X drive line (5).  Each
drive line and light shield pattern are formed at one photo etching
process by changing photo mask design.  Fig. 2 shows cross section of
Fig. 1(a) and (b).  At cross section a, horizontal space between X
drive line (3) and Y drive line metal (4) is reserved to avoid short
between two different layer metals and undesirable electrical
coupling.  Cross section b shows same design rule as a.  Improving
light shield efficiency, organic black material (7) is fabricated on
this structure.  This layer reduces light leakage between two
different layer metals, and light reflection from metal surface.

      To improve light shield efficiency, color filter extension
pattern at the frame area is patterned...