US4562433A
Expired / Lapsed
US
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Fail transparent LCD display
Assignee: McDonnell Douglas Corp
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Filing: 1982-11-26
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Granted: 1985-12-31
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Expires: 2002-11-26
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
2026-10-27 23:56
CPC Classifications
G; G09; G09F; G09F9/00; G06; G06F; G06F3/00; G06F3/14; G06F3/147; 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: 13
Claim 1
Independent Claim
187 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, 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 is energized to operate in a reflective mode simultaneously with said presentation of information on said first display means and a selectively energizable electroluminescent panel means interposed between the first and second liquid crystal display means which provides illumination for the first liquid crystal display means when energized and is substantially transparent when not energized, the electroluminescent panel means comprising an intermediate layer of a transparent electroluminescent material held between two transparent electrode layers; and a secondary display wherein the secondary display is located directly behind the primary liquid crystal display such that, upon a termination of power to the primary liquid crystal display, the primary liquid crystal display becomes substantially transparent and the backup display then becomes visible to the viewer.
Claim 2
Dependent Claim
187 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, 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 is energized to operate in a reflective mode simultaneously with said presentation of information on said first display means and a selectively energizable electroluminescent panel means interposed between the first and second liquid crystal display means which provides illumination for the first liquid crystal display means when energized and is substantially transparent when not energized, the electroluminescent panel means comprising an intermediate layer of a transparent electroluminescent material held between two transparent electrode layers; and a secondary display wherein the secondary display is located directly behind the primary liquid crystal display such that, upon a termination of power to the primary liquid crystal display, the primary liquid crystal display becomes substantially transparent and the backup 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
21 words
The display system of claim 1 wherein the selectively energizable electroluminescent panel means comprises an alternating current thin film electroluminescent panel.
Claim 7
Dependent Claim
195 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, a second liquid display crystal means disposed directly behind the plurality of first liquid crystal display means wherein substantially all of the second liquid crystal display means is energized to operate in a reflective mode simultaneously with said presentation of information on said first display means and a selectively energizable electroluminescent panel means interposed between the first and second liquid crystal display means which provides illumination for the first liquid crystal display means when energized and is substantially transparent when not energized, the electroluminescent panel means comprising an intermediate layer of a transparent electroluminescent material held between two transparent electrode layers; and a backup display wherein the backup display is located directly behind the primary liquid crystal display such that, upon a termination of power to the primary liquid crystal display, the primary liquid crystal display becomes substantially transparent and the backup display then becomes visible to the viewer.
Claim 8
Dependent Claim
195 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, a second liquid display crystal means disposed directly behind the plurality of first liquid crystal display means wherein substantially all of the second liquid crystal display means is energized to operate in a reflective mode simultaneously with said presentation of information on said first display means and a selectively energizable electroluminescent panel means interposed between the first and second liquid crystal display means which provides illumination for the first liquid crystal display means when energized and is substantially transparent when not energized, the electroluminescent panel means comprising an intermediate layer of a transparent electroluminescent material held between two transparent electrode layers; and a backup display wherein the backup display is located directly behind the primary liquid crystal display such that, upon a termination of power to the primary liquid crystal display, the primary liquid crystal display becomes substantially transparent and the backup display then becomes visible to the viewer.
Claim 9
Dependent Claim
20 words
The display system of claim 6 wherein the first liquid crystal display means comprise field effect type liquid crystal displays.
Claim 10
Dependent Claim
21 words
The display system of claim 6 wherein the first liquid crystal display means comprises a dynamic scattering type liquid crystal display.
Claim 11
Dependent Claim
21 words
The display system of claim 6 wherein the selectively energizable electroluminescent panel means comprises an alternating current thin film electroluminescent panel.
Claim 12
Dependent Claim
20 words
The display system of claim 1 further comprising edge lighting means for illumination of the second liquid crystal display means.
Claim 13
Dependent Claim
20 words
The display system of claim 6 further comprising edge lighting means for illumination of the second liquid crystal display means.
References Cited (Backward Citations)
US4238793A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-30 | 1989-07-01 | 1989-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-30 | 1993-07-01 | 1993-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-30 | 1997-07-01 | 1997-12-31 | $7700.00 | Window Closed / Lapsed |