US4218281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacturing process for an electrooptic display device
Assignee: BBC Brown Boveri AG Switzerland
•
Filing: 1978-06-01
•
Granted: 1980-08-19
•
Expires: 1998-06-01
Abstract
Abstract A process for the manufacture of an electrooptical display device including a circuit board and a liquid crystal display cell mounted on the circuit board, including forming a circuit board having at least one light conducting region; disposing the liquid crystal display cell adjacent the light conducting region of the circuit board; locating at least one light emitting element in the circuit board for illuminating the light conducting region; and attaching a semi-transparent reflector to the liquid crystal cell; wherein at least part of the circuit board is manufactured by combining a reflecting layer, which is produced by the deposition of a reflective material on a substrate or on one side of a mesh, with a light diffusing substance, by embedding these two materials together in a transparent polyester or epoxy resin.
Inventors
- 👤 Rino Doriguzzi
- 👤 Markus Egloff
- 👤 Meinolph Kaufmann
- 👤 Terry J. Scheffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:58
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133615; G04; G04G; G04G9/00; G04G9/0023; G04G9/0029; G04G9/0035; G04G9/0041; G09; G09F; G09F9/00; G09F9/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
138 words
A process for the manufacture of an electro-optical display device including a circuit board and a liquid crystal display cell mounted on said circuit board, comprising the steps of: forming a circuit board having at least one light conducting region; disposing said liquid crystal display cell adjacent the light conducting region of the circuit board; locating at least one light emitting element in the circuit board for illuminating the light conducting region; attaching a semi-transparent reflector to said liquid crystal cell; wherein said circuit board forming step further comprises, producing a reflective layer by depositing a reflective material on part of a substrate; providing a light diffusing layer; embedding together the reflecting layer and the light diffusing layer in a transparent resin to form a unit, said unit forming at least one integral portion of said circuit board.
Claim 2
Dependent Claim
138 words
A process for the manufacture of an electro-optical display device including a circuit board and a liquid crystal display cell mounted on said circuit board, comprising the steps of: forming a circuit board having at least one light conducting region; disposing said liquid crystal display cell adjacent the light conducting region of the circuit board; locating at least one light emitting element in the circuit board for illuminating the light conducting region; attaching a semi-transparent reflector to said liquid crystal cell; wherein said circuit board forming step further comprises, producing a reflective layer by depositing a reflective material on part of a substrate; providing a light diffusing layer; embedding together the reflecting layer and the light diffusing layer in a transparent resin to form a unit, said unit forming at least one integral portion of said circuit board.
Claim 3
Dependent Claim
44 words
The process for the manufacture of an electrooptic display device as recited in claim 1, wherein the reflective layer producing step includes the step of depositing a reflective material onto the substrate through the openings of a screen that is placed against the substrate.
Claim 4
Dependent Claim
97 words
A process for the manufacture of an electro-optical display device as is described in claim 1, of: producing a reflective layer by evaporating a reflective material on one side of a woven mesh; placing a light diffusing layer on the top of the reflecting layer; embedding together the reflecting layer with the light diffusing layer by means of a transparent resin, said unit forming a component of a circuit board. wherein the step of producing said reflective layer further comprises: producing said reflective layer by deposition of a reflective material on one side of a woven mesh.
References Cited (Backward Citations)
US4033672A
Cited
US3748018A
Cited
US3984564A
Cited
US4036550A
Cited
US3864905A
Cited
US3984176A
Cited
US4043636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-19 | 1984-02-18 | 1984-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-19 | 1988-02-18 | 1988-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-19 | 1992-02-18 | 1992-08-19 | $7700.00 | Window Closed / Lapsed |