US4371870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fail transparent LCD display with backup
Assignee: McDonnell Douglas Corp
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Filing: 1980-09-02
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Granted: 1983-02-01
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Expires: 2000-09-02
Abstract
Abstract A display system is constructed such that upon failure of the primary display which comprises a Liquid Crystal Display (LCD) that becomes transparent upon failure, a backup display located directly beneath the primary display becomes visible to the display user.
Inventors
- 👤 Michael A. Biferno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:58
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/14; G06F3/147; G09; G09F; G09F9/00; G09G; G09G3/00; G09G3/04; G09G3/16; G09G3/18; H; H03; H03M; H03M11/00; H03M11/02; H03M11/04; H03M11/14; H03M11/18; Y; Y10; Y10S; Y10S345/00; Y10S345/904
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
A display system comprising: a primary liquid crystal display comprising a first liquid crystal display means located closest to a viewer wherein information is presented to the viewer within an at least one information location on the first display means, and a second liquid crystal display means located an effective distance behind the first display means wherein substantially all of the second liquid crystal display means operates in a reflective mode; and a secondary display wherein the secondary display is located directly behind the primary display such that, upon a termination of power to the primary display, the primary display becomes substantially transparent and the secondary display then becomes visible to the viewer.
Claim 2
Dependent Claim
113 words
A display system comprising: a primary liquid crystal display comprising a first liquid crystal display means located closest to a viewer wherein information is presented to the viewer within an at least one information location on the first display means, and a second liquid crystal display means located an effective distance behind the first display means wherein substantially all of the second liquid crystal display means operates in a reflective mode; and a secondary display wherein the secondary display is located directly behind the primary display such that, upon a termination of power to the primary display, the primary display becomes substantially transparent and the secondary display then becomes visible to the viewer.
Claim 3
Dependent Claim
20 words
The system of claim 1 wherein the first liquid crystal display means comprises a field effect type liquid crystal display.
Claim 4
Dependent Claim
20 words
The system of claim 1 wherein the second liquid crystal display means comprises a dynamic scattering type liquid crystal display.
Claim 5
Dependent Claim
68 words
The system of claim 1 wherein the secondary display comprises a key having a first symbol depicted thereon indicative of a first function of a machine operated by the key and wherein the information presented upon the primary display comprises a second symbol indicative of a second function of the machine wherein the second function is activated substantially concurrently with an application of power to the primary display.
Claim 6
Dependent Claim
120 words
A display system comprising: a primary liquid crystal display comprising a plurality of first liquid crystal display means disposed in a stack wherein at least one first display means is selectively energized such that information is presented to a viewer on said energized first display means, and a second liquid crystal display means disposed directly behind the plurality of first liquid crystal display means wherein substantially all of the second liquid crystal display means operates in a reflective mode; and a backup display wherein the backup display is located directly behind the primary display such that, upon termination of power to the primary display, the primary display becomes substantially transparent and the backup display then becomes visible to the viewer.
Claim 7
Dependent Claim
120 words
A display system comprising: a primary liquid crystal display comprising a plurality of first liquid crystal display means disposed in a stack wherein at least one first display means is selectively energized such that information is presented to a viewer on said energized first display means, and a second liquid crystal display means disposed directly behind the plurality of first liquid crystal display means wherein substantially all of the second liquid crystal display means operates in a reflective mode; and a backup display wherein the backup display is located directly behind the primary display such that, upon termination of power to the primary display, the primary display becomes substantially transparent and the backup display then becomes visible to the viewer.
Claim 8
Dependent Claim
20 words
The display system of claim 5 wherein the first liquid crystal display means comprise field effect type liquid crystal displays.
Claim 9
Dependent Claim
21 words
The display system of claim 5 wherein the first liquid crystal display means comprises a dynamic scattering type liquid crystal display.
Claim 10
Dependent Claim
23 words
The display system of claim 1 or claim 5 further comprising edge lighting means for illumination of the second liquid crystal display means.
References Cited (Backward Citations)
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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) | 1986-01-31 | 1986-08-02 | 1987-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-31 | 1990-08-02 | 1991-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-31 | 1994-08-02 | 1995-02-01 | $7700.00 | Window Closed / Lapsed |