US4948708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a display device
Assignee: US Philips Corp
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Filing: 1988-09-22
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Granted: 1990-08-14
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Expires: 2008-09-22
Abstract
Abstract A method of manufacturing a passive display device (FIG. 1) is set forth having two substrates (1, 4) which are provided with fixed electrodes and a movable electrode (10) which is located between the substrates, which electrode lies against the upper substrate (4) in the quiescent state, and is connected to the lower substrate (1) by means of supports (9) of polymeric material. The method of manufacturing such a display device includes steps of forming the movable electrode and enclosed space between the substrates.
Inventors
- 👤 Hendrik Veenvliet
- 👤 Antonius G. H. Verhulst
- 👤 Antonius H. M. Raaymakers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:28
CPC Classifications
G; G09; G09F; G09F9/00; G09F9/30; G09F9/37; G09F9/372; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
212 words
A method of manufacturing a passive display device comprising the steps of: (a) providing a first electrode structure on one side of a first substrate, (b) covering said electrode structure with a layer of dielectric material, (c) forming in succession on said layer of dielectric material a layer of a polymer, a layer of one of Al and Ag, a photoresist layer, and a mask having a plurality of apertures, (d) exposing and developing said photoresist layer through said mask, (e) etching said layer of one of Al and Ag to form a pattern of apertures corresponding to said plurality of apertures, said layer including a plurality of slit-shaped elements and bonding plates remaining between said plurality of apertures, and removing the developed photoresist layer and said mask having a plurality of apertures, (f) etching said polymer by a gas plasma through said pattern of apertures, (g) forming polymeric supports beneath said bonding plates from unetched portions of said layer of polymer, (h) etching away other parts of polymeric material of said layer of polymer, and (i) coating said layer of one of Al or Ag with a transparent second substrate, said transparent second substrate including a surface with a second electrode structure and a dielectric layer facing said first electrode structure.
Claim 2
Independent Claim
212 words
A method of manufacturing a passive display device comprising the steps of: (a) providing a first electrode structure on one side of a first substrate, (b) covering said electrode structure with a layer of dielectric material, (c) forming in succession on said layer of dielectric material a layer of a polymer, a layer of one of Al and Ag, a photoresist layer, and a mask having a plurality of apertures, (d) exposing and developing said photoresist layer through said mask, (e) etching said layer of one of Al and Ag to form a pattern of apertures corresponding to said plurality of apertures, said layer including a plurality of slit-shaped elements and bonding plates remaining between said plurality of apertures, and removing the developed photoresist layer and said mask having a plurality of apertures, (f) etching said polymer by a gas plasma through said pattern of apertures, (g) forming polymeric supports beneath said bonding plates from unetched portions of said layer of polymer, (h) etching away other parts of polymeric material of said layer of polymer, and (i) coating said layer of one of Al or Ag with a transparent second substrate, said transparent second substrate including a surface with a second electrode structure and a dielectric layer facing said first electrode structure.
Claim 3
Dependent Claim
28 words
A method according to claim 1, wherein said layer of polymer formed in step (c) has a roughened, structured surface facing away from said layer of dielectric material.
Claim 4
Dependent Claim
76 words
A method according to claim 2 wherein said layer of polymer formed in step (c) is formed by the steps of providing a layer of a liquid, curable synthetic resin composition on said layer of dielectric material, and pressing said layer of synthetic resin composition with a mould, said mould having a surface texture being the negative of a desired texture of said layer of polymer, said mould being removed upon curing said synthetic resin composition.
Claim 5
Dependent Claim
29 words
A method according to claim 2, wherein said step (c) is carried out by vapor depositing or sputtering said one of Al and Ag onto said layer of polymer.
Claim 6
Dependent Claim
21 words
A method according to claim 1, wherein said step (f) is carried out by etching with a O 2 gas plasma.
Claim 7
Dependent Claim
42 words
A method according to claim 1, wherein during said step (f) portions of said layer of polymer remain beneath said bonding plates and remain at peripheral edges of said first substrate to form a sealing edge between said first and second substrates.
Claim 8
Dependent Claim
17 words
A method according to claim 1, wherein said step (e) is carried by using an alkaline etchant.
Claim 9
Dependent Claim
16 words
A method according to claim 7, wherein said alkaline etchant is an aqueous solution of KOH.
Claim 10
Dependent Claim
29 words
A method according to claim 1, wherein said step (c) is carried out by vapor depositing or sputtering said one of Al and Ag onto said layer of polymer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |