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An LCD Back Light which Keeps Brightness Uniformity

IP.com Disclosure Number: IPCOM000123578D
Original Publication Date: 1999-Jan-01
Included in the Prior Art Database: 2005-Apr-05
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Suzuki, M: AUTHOR [+2]

Abstract

This article describes foundamental structure of LCD back light which keeps brightness uniformity.

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

An LCD Back Light which Keeps Brightness Uniformity

   This article describes foundamental structure of LCD back
light which keeps brightness uniformity.

   Fig. 1 shows a conventional LCD back light structure.  Both
ends of CFL (Cold Fluorescent Lamp) are supported by rubber bush.
Since the rubber bush shut off the light from the CFL, length of the
CFL should be longer than that of effective lighting area in order to
keep the brightness uniformity.  However, narrower framed design is a
trend of LCD construction in these days.  Length of the CFL should be
as short as possible.  In such case, dark area is noticeable
especially at the corner.  That means brightness uniformity degrades.
Novel back light construction uses transparent rubber bush to use the
light from the CFL effectively.  (Fig.2)