Browse Prior Art Database

Backside White Sheet Fixing Method for Thin Backlight

IP.com Disclosure Number: IPCOM000118208D
Original Publication Date: 1996-Nov-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 4 page(s) / 70K

Publishing Venue

IBM

Related People

Hanzawa, F: AUTHOR [+2]

Abstract

Disclosed is a design of a White Sheet tapeless fixing method under thinner design conditions. In general, Liquid Crystal Display (LCD) backlight systems have white sheets to shut light off from their backside. Therefore, it is customary to make free space around a white sheet, without using tapes. Because it has such noticeable characteristics of expansion by heat stress, you can see uncomfortable uniformity choosing an easy fixing method by using tape. But in the case of designing a thin LCD backlight, there is little space; consequently, there is no way to fix a back side white sheet without using tapes.

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Backside White Sheet Fixing Method for Thin Backlight

      Disclosed is a design of a White Sheet tapeless fixing method
under thinner design conditions.  In general, Liquid Crystal Display
(LCD) backlight systems have white sheets to shut light off from
their backside.  Therefore, it is customary to make free space around
a white sheet, without using tapes.  Because it has such noticeable
characteristics of expansion by heat stress, you can see
uncomfortable uniformity choosing an easy fixing method by using
tape.  But in the case of designing a thin LCD backlight, there is
little space; consequently, there is no way to fix a back side white
sheet without using tapes.

      The Figures show an example of design.  In conditional
technology, sheet fixing mechanism is what uses tapes in such a
thinner design.  In this case, bad screen uniformity is evident on a
deformed sheet after heat stress (Figs. 1 and 2).  Another design,
which avoids this problem, makes space around the back side of the
sheet.  However, it needs enough height for the free space, and is
not good for thinner designs (Fig. 3).

Figs. 4-6 show the disclosed design:
  o  Backlight frame has sloped recess area in its side (1)
  o  A side of the sheet is easy to bend with a dotted-line
      slit for fitting flame slope (2)
  o  White sheet has some holes for fixing in slope face (3)
  o  The hole size includes tolerance for sheet expansion (4)
  o  Frame has bosses for sheet's...