Title: Method of making electrical connections for liquid crystal cells

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Claims: I claim:

1. In a method of fabricating a liquid crystal cell, the improvement comprising:

providing on a surface of a first glass substrate first and second spaced apart conductive layers,

adhering to a portion of said first layer a slurry of glass in the form of a bump, said slurry having conductive particles therewithin,

providing on a surface of a second glass substrate a third conductive layer,

disposing said two substrates in face-to-face spaced apart relation with said second and third layers disposed in overlapped relation and with said bump disposed in alignment with a portion of said third layer, and

simultaneously fusion bonding said bump to said first and third layers while maintaining a space between said substrates, said bump providing an electrical connection between said first and third layers and spanning the space between said substrates.

2. The method of claim 1 including the steps of:

disposing a spacer element on one of said two substrates prior to said face-to-face disposing step, the height of said spacer being less than that of said bump, and

moving said substrates towards one another during said fusion step until further inward movement is prevented by said spacer.

3. The method of claim 2 including the steps of:

providing a glass bead on one of said substrates adjacent to the edge thereof prior to said face-to-face disposing step, said bead having a height greater than that of said spacer, and

fusing said bead to the other of said substrates to form a joint between said substrates simultaneously with said fusion bonding step.

4. The method of claim 1 wherein said slurry includes a solvent and a binder, said method including the step of removing said solvent while leaving said binder to adhere said bump to said first layer prior to said fusion bonding of said bump.

Other info:

Inventors: Stern, Herman Abraham (Somerville, NJ, US)

Application Number: 467150
Filing Date: 1974-05-06
Publication_date: 1976-02-10
Assignee: RCA Corporation (New York, NY)
Primary Class(es): 29/592.1 174/261, 349/152, 349/153, 349/155, 349/190, 445/24
Other Classes:
US Patent Ref:

3077511	Feb, 1963	Bohrer et al.	174/68.
3647532	Mar, 1972	Friedman et al.	117/212.
3647533	Mar, 1972	Hicks	117/212.
3689131	Sep, 1972	Klein et al.	350/160.
3751137	Aug, 1973	Fitzgibbons et al.	350/160.
3771855	Nov, 1973	Burns	350/160.
3776769	Dec, 1973	Buck et al.	117/212.
3778126	Dec, 1973	Willson	316/20.

Other Refs:
Primary Examiner: Lake, Roy
Assistant Examiner: Davie, James W.
Attorney: Bruestle; Glenn H., Morris; Birgit E.