US4987289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display heating system
Assignee: Boeing North American Inc
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Filing: 1988-07-21
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Granted: 1991-01-22
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Expires: 2008-07-21
Abstract
Abstract A non-uniform heating system is provided for liquid crystal displays. The system includes structure for applying a greater concentration of heat to the periphery of LCDs. Because mounting structures produce large heat sinks around the edges of LCDs, providing greater heat to the edges results in a more uniform distribution of heat across the LCDs. In another aspect of the heating system, rapid warming may be provided for preselected critical areas of a display to reduce warm-up time, reduce power consumption, and provide mission critical displays in situations such as scrambles of military aircraft on cold weather alert.
Inventors
- 👤 Gary D. Bishop
- 👤 Melvin L. Campbell
- 👤 James E. Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:43
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133382
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
71 words
A heater for a liquid crystal display (LCD), comprising: a thin film conductor applied to an LCD; power supply means connected to said LCD for providing an electrical potential across said thin film conductor; and a plurality of electrical connectors attached to said thin film conductor at its corner edges for directing electrical current through said thin film conductor so as to provide greater heating near the edges of the LCD.
Claim 2
Dependent Claim
71 words
A heater for a liquid crystal display (LCD), comprising: a thin film conductor applied to an LCD; power supply means connected to said LCD for providing an electrical potential across said thin film conductor; and a plurality of electrical connectors attached to said thin film conductor at its corner edges for directing electrical current through said thin film conductor so as to provide greater heating near the edges of the LCD.
Claim 3
Dependent Claim
65 words
A heater for a liquid crystal display (LCD), comprising: a thin film conductor applied to an LCD; power supply means connected to said LCD for providing an electrical potential across said thin film conductor; and a plurality of discontinuities in said thin film conductor for directing electrical current through said thin film conductor so as to provide greater heating near the edges of the LCD.
Claim 4
Dependent Claim
65 words
A heater for a liquid crystal display (LCD), comprising: a thin film conductor applied to an LCD; power supply means connected to said LCD for providing an electrical potential across said thin film conductor; and a plurality of discontinuities in said thin film conductor for directing electrical current through said thin film conductor so as to provide greater heating near the edges of the LCD.
Claim 5
Dependent Claim
80 words
A heater for a liquid crystal display (LCD), comprising: a thin film conductor applied to an LCD; power supply means connected to said LCD for providing an electrical potential across said thin film conductor; means for directing electrical current through said thin film conductor so as to provide greater heating near the edges of the LCD; and means for providing heat to preselected critical areas of the LCD for rapid warm-up of said critical areas during start-up of the LCD.
Claim 6
Dependent Claim
80 words
A heater for a liquid crystal display (LCD), comprising: a thin film conductor applied to an LCD; power supply means connected to said LCD for providing an electrical potential across said thin film conductor; means for directing electrical current through said thin film conductor so as to provide greater heating near the edges of the LCD; and means for providing heat to preselected critical areas of the LCD for rapid warm-up of said critical areas during start-up of the LCD.
Claim 7
Independent Claim
63 words
A system for providing non-uniform heating of a liquid crystal display (LCD), comprising: a thin film conductor applied to an LCD; power supply means coupled to said LCD for providing an electrical potential across the thin film conductor; and means for directing electrical power to preselected critical areas of the LCD for rapid warm-up of said critical areas during start-up of the LCD.
Claim 8
Independent Claim
63 words
A system for providing non-uniform heating of a liquid crystal display (LCD), comprising: a thin film conductor applied to an LCD; power supply means coupled to said LCD for providing an electrical potential across the thin film conductor; and means for directing electrical power to preselected critical areas of the LCD for rapid warm-up of said critical areas during start-up of the LCD.
Claim 9
Dependent Claim
21 words
The LCD heating system of claim 4, wherein said power directing means comprises a fixed geometry for said thin film conductor.
Claim 10
Dependent Claim
32 words
The LCD heating system of claim 4, wherein said electrical power directing means comprises a plurality of electrical connectors attached to the thin film conductor at the edges corner of the LCD.
Claim 11
Dependent Claim
34 words
The LCD heating system of claim 4, further comprising: a sensor for sensing the temperature of said critical areas; and said power directing means comprising a microprocessor that receives an input from said sensor.
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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) | 1994-01-21 | 1994-07-23 | 1995-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-21 | 1998-07-23 | 1999-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-21 | 2002-07-23 | 2003-01-22 | $7700.00 | Window Closed / Lapsed |