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A Backlighting Unit with Adjustable Color Point

IP.com Disclosure Number: IPCOM000123346D
Original Publication Date: 1998-Sep-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 46K

Publishing Venue

IBM

Related People

Suzuki, M: AUTHOR

Abstract

Disclosed is a backlighting unit for a Liquid Crystal Display. This backlighting unit can change its color point without any trade-off.

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A Backlighting Unit with Adjustable Color Point

   Disclosed is a backlighting unit for a Liquid Crystal
Display.  This backlighting unit can change its color point without
any trade-off.

   In order to establish a backlighting unit with adjustable
color temperature, the followings are essential.
  1.  This backlighting unit comprises two or more straight
      light sources such as cold cathode fluorescent tubes,
      which are located directly behind the screen.
  2.  Light sources should be arranged in a manner that they are
      parallel each other along the long side or short side of
      the screen.
  3.  Light sources should be arranged in two layers, which are
      depicted in Figure 1.
  4.  Color of the light source is not uniform.  Two or more
      colors should be selected.  White, blue, green, and red for
      instance.
  5.  In the upper layer of two-storied lamp arrangement in
      Figure 1, white and green colored lamps are selected.  White
      lamps and green lamps are arranged side by side, like one in
      Figure 1.
  6.  In the lower layer of two-storied lamp arrangement in
      Figure 1, a blue colored lamp is arranged below the
      white colored lamp, and a green lamp is arranged below
      the red colored lamp.
  Only above construction allows us to establish a backlighting
  unit with adjustable color temperature by controlling the
  luminance of each...