Browse Prior Art Database

Cathodoluminescent Backlight for Liquid Crystal Displays

IP.com Disclosure Number: IPCOM000119473D
Original Publication Date: 1991-Jan-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 1 page(s) / 38K

Publishing Venue

IBM

Related People

Caswell, N: AUTHOR [+3]

Abstract

Disclosed is a thin, power efficient backlight for liquid crystal displays which is based on a large area array of field emission points and a cathodoluminescent phosphor.

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

Cathodoluminescent Backlight for Liquid Crystal Displays

      Disclosed is a thin, power efficient backlight for liquid
crystal displays which is based on a large area array of field
emission points and a cathodoluminescent phosphor.

      The backlight operates by accelerating the electrons supplied
by the field emission points to a voltage at which efficient
cathodoluminescence occurs (/1000 volts).  The array can be segmented
into separately controlled regions and aligned with segments of
different color phosphors as in Fig. 1.  In this configuration, the
separate red, blue and green phosphors can be individually activated
in rapid succession, e.g., at several hundred hertz.  The result is a
light source which provides red, green, and blue light in a rapid
sequence and is suitable for field sequential color with a fast
liquid crystal shutter.

      The advantages of this structure are its thinness, potential
power efficiency, and its ability to provide field sequential color,
thus eliminating color filters with their reduced resolution and low
light transmission.

      Disclosed anonymously.