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DIFFERENTIAL VACUUM FILLING SYSTEM FOR DISPLAYS

IP.com Disclosure Number: IPCOM000023115D
Original Publication Date: 1976-Oct-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 288K

Publishing Venue

Xerox Disclosure Journal

Abstract

An apparatus and method are proposed for filling display type devices with liquid crystal free of bubbles, The filling system is a built up unit using glass spacer rings 1 and a vacuum feedthrough collar 2, A vacuum chamber is separated into two sections A and B by means of a separation plate 3, Hypodermic syringe barrels 4 pass through this plate with their open ends in the upper chamber A while the other ends are attached to hypodermic needles 5 glued into a display device 6 which is located in the lower chamber B of the vacuum system.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

DIFFERENTIAL VACtJIIM FILLING SYSTEM FOR DISPLAYS
Ivo, P. Gates

Proposed Classification

TJ,S, Cl, 350/16OLC
Int, Cl, G02b 5/23

An apparatus and method are proposed for filling display type devices with liquid crystal free of bubbles, The filling system is a built up unit using glass spacer rings 1 and a vacuum feedthrough collar 2, A vacuum chamber is
separated into two sections A and B by means of a separation
plate 3, Hypodermic syringe barrels 4 pass through this
plate with their open ends in the upper chamber A while the
other ends are attached to hypodermic needles 5 glued into
a display device 6 which is located in the lower chamber B
of the vacuum system.

To fill the device both chambers are pumped to lO~~torr
or better, The liquid crystal 7 is then heated while under
vacuum in the top chamber to remove dissolved gas and it
is then poured into the hypodermic syringe 4, A vacuum
manipulator 8 is used for this step in the process, A
butterfly valve 9 mounted in the chamber separation plate
is then closed to reduce the load on the vacuum pump when
the pressure is increased in the top chamber A, Sufficient
inner gas 9 is added to the top chamber A to drop the
vacuum to approximately 10~ torr, The bottom chamber B
is kept at l0~~or better by continuing to pump the system,

Volume 1 Numbers 9/10 September/October 1976 55

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Page 2 of 2

DIFFERENTIAL VACUUM FILING SYSTEM FOP. DISPLAYS (Cont~d)

The differen...