US5459833A
Expired / Lapsed
US
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Display control system
Assignee: Ricoh Co Ltd
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Filing: 1993-12-15
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Granted: 1995-10-17
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Expires: 2013-12-15
Abstract
Abstract A display control system for a notebook type personal computer, word processor or similar electronic apparatus requiring a power saving implementation. The system has a first memory for storing graphic data, and a control section for reading the graphic data out of the first memory repetitively. The control section has a circuit for determining whether or not the graphic data each being stored in a respective address of the first memory to be displayed side by side in a picture of the display are identical with each other, and a second memory for memorizing whether or not the data are identical with each other. When the content of the second memory is representative of identity of graphic data, the control section causes the graphic data to be displayed without reading the first memory, thereby reducing the power consumption of the system.
Inventors
- 👤 Yoshiyuki Nishizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:39
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/02; G09G5/022; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G2320/00; G09G2320/10; G09G2320/103; G09G2330/00; G09G2330/02; G09G2330/021; G09G2360/00; G09G2360/18; G09G3/2092
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
169 words
A display control system for reducing power consumption of a display, comprising: a first memory for storing graphic data; a control section for reading the graphic data out of said first memory repetitively; and a first latch which stores the graphic data read from the first memory; said control section having determining means for determining whether or not the graphic data each being stored in a respective address of said first memory to be displayed side by side in a picture of said display are identical with each other, and a second memory for memorizing whether or not said graphic data each being stored in the respective address of said first memory are identical with each other; wherein when a content of said second memory is representative of an identity of the graphic data, said control section causes the graphic data to be displayed by reading the graphic data stored in the first latch without reading said first memory, to thereby reduce power consumption of said display control system.
Claim 2
Dependent Claim
169 words
A display control system for reducing power consumption of a display, comprising: a first memory for storing graphic data; a control section for reading the graphic data out of said first memory repetitively; and a first latch which stores the graphic data read from the first memory; said control section having determining means for determining whether or not the graphic data each being stored in a respective address of said first memory to be displayed side by side in a picture of said display are identical with each other, and a second memory for memorizing whether or not said graphic data each being stored in the respective address of said first memory are identical with each other; wherein when a content of said second memory is representative of an identity of the graphic data, said control section causes the graphic data to be displayed by reading the graphic data stored in the first latch without reading said first memory, to thereby reduce power consumption of said display control system.
Claim 3
Dependent Claim
28 words
The display control system as claimed in claim 1, further comprising checking means for determining, frame by frame, whether or not contents of said second memory are valid.
Claim 4
Dependent Claim
16 words
The display control system as claimed in claim 2, wherein said checking means comprises a flip-flop.
Claim 5
Dependent Claim
21 words
The display control system as claimed in claim 1, wherein said second memory has a smaller capacity than said first memory.
Claim 6
Dependent Claim
24 words
The display control system as claimed in claim 4, wherein said second memory and said control section are packaged in a single IC chip.
Claim 7
Dependent Claim
26 words
The display control system as claimed in claim 1, wherein said first memory and said second memory comprise a graphic RAM and a status RAM, respectively.
Claim 8
Dependent Claim
54 words
The display control system as claimed in claim 6, wherein said determining means comprises a second and a third latch to which two data are respectively applied from said graphic RAM, and a comparator for comparing the data of said second and third latches and sending a result of comparison to said status RAM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-10-16 | 1999-04-17 | 1999-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-16 | 2003-04-17 | 2003-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-16 | 2007-04-17 | 2007-10-17 | $7700.00 | Window Closed / Lapsed |