US4917466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for electrically connecting IC chips, a resinous bump-forming composition used therein and a liquid-crystal display unit electrically connected thereby
Assignee: Shin-Etsu Polymer Co Ltd
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Filing: 1988-08-02
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Granted: 1990-04-17
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Expires: 2008-08-02
Abstract
Abstract The invention provides a very efficient and reliable method for electrically connecting the electrodes of an electronic device, e.g., IC chips, and the electrodes of, for example, a glass-made circuit board substrate with good repairability. Thus, the electrodes of the IC chip are each first coated with an electroconductive thermally meltable adhesive resinous composition to form a resinous bump, the IC chip is mounted on the substrate with the adhesive-coated electrodes contacting with the respective electrodes of the substrate, and remelting and then solidifying the resinous bumps so that the electrodes are bonded and electrically connected together. As compared with the conventional methods in which an electroconductive thermosetting resinous composition is used for the bumps on the electrodes, the electrical connection can be obtained with a smaller thermal effect and good replaceability of the IC chip found unacceptable with an acceptable one.
Inventors
- 👤 Akio Nakamura
- 👤 Naoki Kodama
- 👤 Osami Hayashi
- 👤 Hirofumi Saita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:48
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1345; G02F1/13452; H; H10; H10W; H10W74/00; H10W74/01; H10W74/012; H10W74/10; H10W74/15; H10W72/00; H10W72/071; H10W72/072; H10W72/07251; H10W72/20; H10W72/851; H10W72/853; H10W72/856; H10W90/00; H10W90/701; H10W90/721; H10W90/724; H10W90/731; H10W90/734
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
128 words
A method for electrically connecting electrodes of an electronic device with respective electrodes of a circuit board which comprises the steps of: (a) forming a coating layer of an electroconductive thermoplastic adhesive resinous composition on the electrodes of the electronic device; (b) putting the electronic device on the circuit board in such a position that the electrodes of the electronic device coated with the electroconductive thermoplastic resinous composition are each contacted with the respective electrodes of the circuit board; (c) pressing the electronic device and the circuit board together with a pressure; (d) heating the coating layer of the electroconductive thermoplastic adhesive resinous composition to cause melting thereof; and (e) cooling the molten electroconductive thermoplastic adhesive resinous composition to effect solidification of the same while maintaining the pressure.
Claim 2
Independent Claim
128 words
A method for electrically connecting electrodes of an electronic device with respective electrodes of a circuit board which comprises the steps of: (a) forming a coating layer of an electroconductive thermoplastic adhesive resinous composition on the electrodes of the electronic device; (b) putting the electronic device on the circuit board in such a position that the electrodes of the electronic device coated with the electroconductive thermoplastic resinous composition are each contacted with the respective electrodes of the circuit board; (c) pressing the electronic device and the circuit board together with a pressure; (d) heating the coating layer of the electroconductive thermoplastic adhesive resinous composition to cause melting thereof; and (e) cooling the molten electroconductive thermoplastic adhesive resinous composition to effect solidification of the same while maintaining the pressure.
Claim 3
Dependent Claim
45 words
The method as claimed in claim 1 wherein the coating layer of an electroconductive thermoplastic adhesive resinous composition is formed on the electrodes of the electronic device by using the composition diluted with an organic solvent followed by evaporation of the organic solvent to dryness.
Claim 4
Dependent Claim
37 words
The method as claimed in claim 1 wherein the coating layer of an electroconductive thermoplastic adhesive resinous composition formed on the electrodes of the electronic device has a thickness in the range from 5 to 50 μm.
Claim 5
Dependent Claim
40 words
The method as claimed in claim 1 wherein the coating layer of an electroconductive thermoplastic adhesive resinous composition formed on the electrodes of the electronic device has a volume resistivity in the range from 1×10 -5 ohm·cm to 10 ohm·cm.
Claim 6
Dependent Claim
166 words
In a liquid-crystal display unit comprising two circuit board substrates disposed in parallel with a space therebetween filled with a liquid crystal, at least one of the substrates being electrically connected to an IC chip for driving the liquid-crystal display, an improvement that the electrodes of the substrate and the respective electrodes of the IC chip are electrically connected by the steps of: (a) forming a coating layer of an electroconductive thermoplastic adhesive resinous composition on the electrodes of the IC chip; (b) putting the IC chip on the substrate in such a position that the electrodes of the IC chip coated with the electroconductive thermoplastic resinous composition are each contacted with the respective electrodes of the substrate; (c) pressing the IC chip and the substrate together with a pressure; (d) heating the coating layer of the electroconductive thermoplastic adhesive resinous composition to cause melting thereof; and (e) cooling the molten electroconductive thermoplastic adhesive resinous composition to effect solidification of the same while maintaining the pressure.
Claim 7
Dependent Claim
166 words
In a liquid-crystal display unit comprising two circuit board substrates disposed in parallel with a space therebetween filled with a liquid crystal, at least one of the substrates being electrically connected to an IC chip for driving the liquid-crystal display, an improvement that the electrodes of the substrate and the respective electrodes of the IC chip are electrically connected by the steps of: (a) forming a coating layer of an electroconductive thermoplastic adhesive resinous composition on the electrodes of the IC chip; (b) putting the IC chip on the substrate in such a position that the electrodes of the IC chip coated with the electroconductive thermoplastic resinous composition are each contacted with the respective electrodes of the substrate; (c) pressing the IC chip and the substrate together with a pressure; (d) heating the coating layer of the electroconductive thermoplastic adhesive resinous composition to cause melting thereof; and (e) cooling the molten electroconductive thermoplastic adhesive resinous composition to effect solidification of the same while maintaining the pressure.
References Cited (Backward Citations)
JPS5569186A
Cited
US4474432A
Cited
US4362903A
Cited
JPS57188852A
Cited
US4413257A
Cited
US4643526A
Cited
JPS6194330A
Cited
JPS61279139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-16 | 1993-10-16 | 1994-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-16 | 1997-10-16 | 1998-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-16 | 2001-10-16 | 2002-04-17 | $7700.00 | Window Closed / Lapsed |