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Browse Prior Art Database

Electro Luminescent Backlight for Color Display

IP.com Disclosure Number: IPCOM000109075D
Original Publication Date: 1992-Jul-01
Included in the Prior Art Database: 2005-Mar-23
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Hodgson, RT: AUTHOR

Abstract

Disclosed is a design for an electroluminescent backlight for a color display which triples the resolution of the display and cuts the power used for the backlight by a factor 3.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 55% of the total text.

Electro Luminescent Backlight for Color Display

       Disclosed is a design for an electroluminescent backlight
for a color display which triples the resolution of the display and
cuts the power used for the backlight by a factor 3.

      The invention has a light-emitting surface which emits light of
three different colors (e.g., red, green, blue) in a pulse short
compared to the flicker time (e.g., 1-10 msec).  An actively switched
matrix controls the transmission of the light pulses.  The same
picture element is used successively for the three colors, instead of
being limited to red, green or blue as it is now.  The efficiency of
the device would be increased since all picture elements could
transmit the light of the various colors, instead of the one color
being absorbed in 2/3 the picture elements as it is now.

      One way to produce such a backlight is to use screening to lay
down lines of the red, green or blue electroluminescent material.  A
common, transparent electrode 1 of material such as Sn02 is deposited
on a transparent substrate 2, and the red 3, green 4 and blue 5
electroluminescent material is screened on in parallel lines narrow
enough so they could not be resolved by the naked eye at the normal
viewing distance.  Reflecting electrodes 6 over the
electroluminescent material could be deposited to form interdigitated
lines as shown in Fig. 1.  All the reflective conducting metal 6
covering one color material would be interconnected a...