Browse Prior Art Database

Display Mode Selectable Liquid Crystal Display Unit

IP.com Disclosure Number: IPCOM000114095D
Original Publication Date: 1994-Nov-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Suzuki, S: AUTHOR

Abstract

Disclosed herein is a Liquid Crystal Display (LCD) unit of selecting the display mode, according to the purpose such as wide viewing angle requirement or high contrast ratio with less color change. The display modes are Normally Black (NB) and Normally White (NW), which is easily selectable by polarizer unit change.

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Display Mode Selectable Liquid Crystal Display Unit

      Disclosed herein is a Liquid Crystal Display (LCD) unit of
selecting the display mode, according to the purpose such as wide
viewing angle requirement or high contrast ratio with less color
change.  The display modes are Normally Black (NB) and Normally White
(NW), which is easily selectable by polarizer unit change.

      The Twisted Nematic (TN) mode is widely used for the LCD, and
has two display modes.  Normally Black (NB) mode has wide viewing
angle (where its cell thickness is precisely controlled); however, it
has color change and lower contrast ratio compared with Normally
White (NW) mode.  NW mode has higher contrast ratio and wide process
(cell fabrication) margin; however, it has narrow viewing cone,
especially up-down direction.  Each mode has merits and demerits (*).
The usual LCD has no selection of display mode because the polarizers
are directly applied to the glass substrate.  So display user can't
easily change the display quality according to the purpose.

      The disclosed display unit is shown in the Figure, which has a
selectable polarizer unit (1) (polarizer itself or polarizer applied
glass) and an applied polarizer (2).  The selectable polarizer can be
set to the slot (3) of the display unit (4).  The liquid crystal
panel (5) has an upper glass (6) and a lower glass (7) which
sandwiches the liquid crystals.  The display user can easily set the
polarizer unit (1), which...