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US 4,562,433 AGranted
Fail transparent LCD display
AssigneeMcDonnell Douglas Corporation
InventorMichael A. Biferno
Life of this patent
Estimating the term…
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.
Claims11
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.
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.
Dependencies are inferred from the claim text.