Browse Prior Art Database

Self-Contained Optical Enhancement Filter for LED Display Devices

IP.com Disclosure Number: IPCOM000101379D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Cooke, KE: AUTHOR [+3]

Abstract

A self-contained optical filter, as used in light-emitting diode (LED) display devices, is designed to enhance the optical clarity of descriptive information under all types of lighting conditions. Described is a method and design for mounting and holding the optical filter in a holder in a preferred direction without the use of adhesives.

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Self-Contained Optical Enhancement Filter for LED Display Devices

       A self-contained optical filter, as used in
light-emitting diode (LED) display devices, is designed to enhance
the optical clarity of descriptive information under all types of
lighting conditions.  Described is a method and design for mounting
and holding the optical filter in a holder in a preferred direction
without the use of adhesives.

      In prior art, flexible plastic material has been used to cover
written material, such as used in grocery stores to describe
merchandise and prices.  The concept described herein is similar in
that it forms a flexible part into a curved shape for insertion into
a holder.  However, the concept combines the idea of forming a
flexible part into a curved shape for subsequent release into holder
surfaces with a means to prevent the insertion of the part in the
holder in a manner opposite to a preferred direction.

      The self-contained optical enhancement filter 10 is shown in
Fig.  1. It is fabricated from .03-inch-thick colored polycarbonate,
or similar material, to provide flexibility for insertion into bezel
13 (Fig. 2). Different size tabs 11 can be used at the ends of the
filter to ensure proper mounting direction, as required. When
pressure is applied to tabs 11 in an inward direction, filter 10
flexes convexly about the center, decreasing the total length and
allowing it to be inserted in slots 12 provided in bezel 13, as shown
in Fig. 3...