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US5144292A
Expired / Lapsed
US
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Liquid crystal display system with variable backlighting for data processing machine
Assignee: Sharp Corp
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Filing: 1986-07-17
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Granted: 1992-09-01
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Expires: 2006-07-17
Abstract
Abstract A data processing device is provided with a liquid crystal display incorporating electroluminescent backlighting, in which the electroluminescent backlighting panel is provided with several degrees of luminosity. A selection circuit specifies the degree of luminosity to allow the electroluminescent backlighting panel to generate the selected luminosity level.
Inventors
- 👤 Tomikatsu Shiraishi
- 👤 Isao Kawano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:23
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/22; G09G3/30; G09G3/34; G09G3/3406; G09G2320/00; G09G2320/06; G09G2320/0606; G09G2320/0626; G09G2320/0633
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
93 words
A data processing machine, comprising: memory means for storing control instructions and data; processing means for executing said control instructions and processing said data; liquid crystal display means for displaying data, including an electroluminscent backlighting panel; means for driving said electroluminescent backlighting panel at several levels of luminosity; and means for selecting a specific level of luminosity to cause said driving means to drive said electroluminescent backlighting panel at said specific level; said means for selecting including a data latch circuit which outputs a specific luminosity level code to said means for driving.
Claim 2
Dependent Claim
93 words
A data processing machine, comprising: memory means for storing control instructions and data; processing means for executing said control instructions and processing said data; liquid crystal display means for displaying data, including an electroluminscent backlighting panel; means for driving said electroluminescent backlighting panel at several levels of luminosity; and means for selecting a specific level of luminosity to cause said driving means to drive said electroluminescent backlighting panel at said specific level; said means for selecting including a data latch circuit which outputs a specific luminosity level code to said means for driving.
Claim 3
Dependent Claim
21 words
The data processing machine as claimed in claim 1, wherein said several levels of luminosity comprise a plurality of discrete values.
Claim 4
Dependent Claim
19 words
The data processing machine as claimed in claim 1, wherein said several levels comprise at least two discrete values.
Claim 5
Dependent Claim
16 words
The data processing machine as claimed in claim 3, wherein said several levels comprise four levels.
Claim 6
Dependent Claim
17 words
The data processing machine as claimed in claim 1, wherein said means for selecting comprises a keyboard.
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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) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |