US4952036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High resolution LCD display system
Assignee: In Focus Systems Inc
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Filing: 1989-07-12
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Granted: 1990-08-28
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Expires: 2009-07-12
Abstract
Abstract A high resolution LDC display is fabricated with a plurality of panels. Each panel has active rows and inactive rows. The panels are stacked and aligned so that each active row is in alignment with inactive rows in all the other panels of the stack. The parallax problem inherent with this stacked cell approach is eliminated by a lens system that collimates light illuminating the stacked assembly.
Inventors
- 👤 Paul E. Gulick
- 👤 Arlie R. Conner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:07
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1347; G02F1/13471; G02F1/13473; G02F1/1335; G02F1/133526; G06; G06F; G06F1/00; G06F1/16; G06F1/1601; G06F1/1613; G06F1/20; G06F1/203; G02F1/133528; G02F1/133533; G02F1/1343; G02F1/134309; G02F1/134336; G06F2200/00; G06F2200/16; G06F2200/161; G06F2200/1612
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
175 words
A method of providing a high resolution display comprising the steps: providing a first liquid crystal cell of the supertwisted nematic type; operating the first liquid crystal cell to define a first display row; compensating wavelength-dependent optical effects exhibited by the first display row by providing a second liquid-crystal cell of the supertwisted nematic type in an optical assembly with said first cell, said second cell having opposite twist sense from the first cell and presenting a passive area in superimposed relationship with the first display row, said passive area in the second cell providing an opposite twist counterpart to the first display row, thereby compensating for the first display row's wavelength dependent effects; operating said second liquid crystal cell to define a second display row; compensating wavelength-dependent optical effects exhibited by the second display row by providing in the first liquid crystal cell a passive area in superimposed relationship with the second display row, said passive area providing an opposite twist counterpart to the second display row, thereby compensating for its wavelength dependent effects.
Claim 2
Independent Claim
175 words
A method of providing a high resolution display comprising the steps: providing a first liquid crystal cell of the supertwisted nematic type; operating the first liquid crystal cell to define a first display row; compensating wavelength-dependent optical effects exhibited by the first display row by providing a second liquid-crystal cell of the supertwisted nematic type in an optical assembly with said first cell, said second cell having opposite twist sense from the first cell and presenting a passive area in superimposed relationship with the first display row, said passive area in the second cell providing an opposite twist counterpart to the first display row, thereby compensating for the first display row's wavelength dependent effects; operating said second liquid crystal cell to define a second display row; compensating wavelength-dependent optical effects exhibited by the second display row by providing in the first liquid crystal cell a passive area in superimposed relationship with the second display row, said passive area providing an opposite twist counterpart to the second display row, thereby compensating for its wavelength dependent effects.
Claim 3
Dependent Claim
39 words
The method of claim 1 which further includes: providing a source of illumination; collimating the illumination; passing the collimated light through the first and second cells; and dispersing the collimated light after passing through the first and second cells.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |