Browse Prior Art Database

Apparatus for Labeling Removable Media Cartridges with Bistable LCD

IP.com Disclosure Number: IPCOM000176254D
Original Publication Date: 2008-Nov-11
Included in the Prior Art Database: 2008-Nov-11
Document File: 3 page(s) / 64K

Publishing Venue

IBM

Abstract

Removable media cartridges would be improved if user messages could be displayed on them, such as (a) this tape cartridge experienced a permanent write error, DO NOT USE, or (b) this cleaner cartridge has reached the maximum allowable usage and should be recycled, or (c) whether the tape cartridge contains encrypted data. Until now, the problem was such a message always required a continually applied voltage. This requirement of a continually applied voltage is now resolved. This article advocates the novel use of Bistable Liquid Crystal Displays such as Ferroelectric Liquid Crystal Displays (FLCD) to display information on the removable media cartridge. The Ferroelectric Liquid Crystal molecules snap to one orientation or another (light and dark) depending on an applied voltage, and that orientation is held even after the applied voltage is removed. This makes FLCDs an ideal visual user-interface for removable media cartridges such as tape cartridges.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 3

Apparatus for Labeling Removable Media Cartridges with Bistable LCD

Removable media cartridges would be improved if user messages could be displayed on them, such as (a) this tape cartridge experienced a permanent write error, DO NOT USE, or (b) this cleaner cartridge has reached the maximum allowable usage and should be recycled, or (c) whether the tape cartridge contains encrypted data. Until now, the problem was such a message always required a continually applied voltage. This requirement of a continually applied voltage is now resolved. This article advocates the novel use of Bistable Liquid Crystal Displays such as Ferroelectric Liquid Crystal Displays (FLCD) to display information on the removable media cartridge. The Ferroelectric Liquid Crystal molecules snap to one orientation or another (light and dark) depending on an applied voltage, and that orientation is held even after the applied voltage is removed. This makes FLCDs an ideal visual user-interface for removable media cartridges such as tape cartridges.

Figures 1 and 2 show tape cartridge 100 comprising cartridge body 101 and a door 106 from which tape exits the tape cartridge for reading and writing data in the tape drive (not shown). Figure 1 shows that tape cartridge enters the tape drive along direction 107. Tape cartridge 100 may have a wirelessly accessible cartridge memory 103 on printed circuit board (PCB) 105.

FLCD 120

Figure 1. Isometric of Tape Cartridge showing Top-Mounted FLCD

However, tape cartridge 100 also has a thin, bistable, FLCD (Ferroelectric Liquid Crystal Display) 120 which is accessible by a connector 116 which wraps around the back and bottom of tape cartridge 100. FLCDs are bistable, meaning that once a voltage is applied, the FLC (Ferroelectric Liquid Crystal) molecules realigns and then the FLC molecules retain their new position after the voltage is removed. The voltage required to switch the liquid crystal material is less than 5 volts, which is CMOS compatible. The construction of the FLCD may involve ITO-coated (Indium Tin Oxide) polyethersulphone film as the substrates. After structuring of the ITO electrodes, a polyamide is deposited

1

101

100

103

105

107

106

[This page contains 2 pictures or other non-text objects]

Page 2 of 3

on the substrate using flexographic printing, and a roller is used to orientate the direction of the FLC molecules. Transparent etched spacers (0.8 microns) are then deposited and polarizers added to give a final thickness of approximately 0.5 mm. These FLCDs are stable over human-handling pressure and work over a large temperature range of -20 degrees C to 70 d...