Browse Prior Art Database

Optically Coupled Programmable Keytop

IP.com Disclosure Number: IPCOM000050197D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Garrett, MJ: AUTHOR

Abstract

The optically coupled programmable keytop, described below, allows a keyboard to be personalized, without changing keytops or wiring, for any keyboard application or language.

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 77% of the total text.

Page 1 of 2

Optically Coupled Programmable Keytop

The optically coupled programmable keytop, described below, allows a keyboard to be personalized, without changing keytops or wiring, for any keyboard application or language.

Each keytop contains an integrated circuit chip which includes, as shown in Fig. 1, a five-character position liquid crystal or electrochromic display 1, a register 2 for holding the display contents,a deserialiser 3 capable of interpreting start-stop data, two solar power cells 4 and 5 mounted beneath the integrated circuit chip for supplying DC power in the steady state and serial data when modulated, and a capacitor 6 with two diodes 7 and 8 to maintain the power supply during modulation of light incident on the solar cells 4 and 5.

The keys are mounted in an XY matrix on the keyboard with optical power and signals supplied to the solar cells by means of X and Y optical bars 9 and 10, as shown in Fig. 2. Each keytop 11 is hollow to allow extensions 12 and 13 of its X and Y optical bars to pass therein to couple optical energy to its integrated circuit chip. The X-axis and yaxis optical bars 9 and 10 do not have to be coherent optical fibers but can be silvered plastics material. X-axis bar 9 allows steady optical power to be supplied to chips coupled to it or modulated serial legend data to be supplied. The Y-axis optical bar 10 allows steady optical power to be supplied to chips coupled to it or modulated chip selection.

The method of optical coupli...