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Browse Prior Art Database

Lamp Replaceable Backlight Unit

IP.com Disclosure Number: IPCOM000110519D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Natsuyama, Y: AUTHOR [+2]

Abstract

Disclosed is a structure of a backlighting device for a transmissive liquid crystal display. By optimizing mechanical design of a backlight module, one can easily replace the lamp of the backlight with a least effort and small cost. This easiness allows us to use a hot cathode fluorescent lamp which has a relatively higher radiation efficiency but shorter lifetime than a cold cathode fluorescent lamp.

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Lamp Replaceable Backlight Unit

       Disclosed is a structure of a backlighting device for a
transmissive liquid crystal display.  By optimizing mechanical design
of a backlight module, one can easily replace the lamp of the
backlight with a least effort and small cost.  This easiness allows
us to use a hot cathode fluorescent lamp which has a relatively
higher radiation efficiency but shorter lifetime than a cold cathode
fluorescent lamp.

      Conventional design divides the liquid crystal display module
into two groups.  One is the liquid crystal portion and the other is
the backlight portion.  With this structure, once the lamp(s) failed,
all of the backlight portion must be replaced at great cost.

      This backlight device consists of two groups, each group
fastened to each other by rivets.  One group is named as a main
portion which includes a liquid crystal cell, a light-guide for
backlight, inverter circuit for the purpose of driving a lamp, and
the other is named as a lamp unit which includes a hot cathode
fluorescent lamp and cables for connection.  With the construction
shown in the figure, only the lamp can be easily replaced with
minimum cost requirement.