EP0229659A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Information processing system having decod; write and read means
Assignee: Hitachi Ltd
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Filing: 1987-01-13
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Granted: —
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Expires: 2007-01-13
Abstract
Abstract In an information processing system for efficiently allocating a period other than the period during which read means (320, 360, 330) accesses a display memory (400) for display, to the writing of a pixel signal decoded by decode/write means (310, 330, 380) into the display memory, read means informs to the decode/write means a period during which the read means does not access the display memory and the decode/write means writes the decoded pixel signal into the display memory at a timing at which the display memory is not accessed by the read means.
Inventors
- 👤 Koozoo Nakamura
- 👤 Masaharu Tadauchi
- 👤 Nagaharu Hamada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 19:11
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/001; G09G5/22; G09G2310/00; G09G2310/04
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
85 words
An information processing device comprising: decode means (310) for decoding encoded text information to an original pixel information; a display memory (400) for storing the decoded pixel signal; write means (310, 330, 380) for writing the decoded pixel signal into said display memory; read means (320, 360, 330) for reading the decoded pixel signal from said display memory; and timing control means (320, 360, 350, 330) for switching the writing and the reading for sequentially displaying the decoded pixel signal on a display device (500).
Claim 2
Dependent Claim
85 words
An information processing device comprising: decode means (310) for decoding encoded text information to an original pixel information; a display memory (400) for storing the decoded pixel signal; write means (310, 330, 380) for writing the decoded pixel signal into said display memory; read means (320, 360, 330) for reading the decoded pixel signal from said display memory; and timing control means (320, 360, 350, 330) for switching the writing and the reading for sequentially displaying the decoded pixel signal on a display device (500).
Claim 3
Dependent Claim
37 words
An information processing device according to Claim 1 wherein the decoded pixel signal is written into said display memory during horizontal flyback period (B) and/or vertical flyback period (C) of a non-display period of the display device.
Claim 4
Dependent Claim
59 words
An information processing device according to Claim 2 wherein when the access to said display memory by said write means and the access to said display memory by said read means compete, the access by said read means is prioritized and the access to said display memory by said write means waits until the end of the display period.
Claim 5
Dependent Claim
45 words
An information processing device according to Claim 1 wherein the display period (A) of said display device is divided into a display cycle period and a non-display cycle period, and the decoded pixel signal is written into said display memory during said non-display cycle period.
Claim 6
Dependent Claim
44 words
An information processing device according to Claim 4 wherein when said write means accesses said display memory during said display cycle period, the access to said display memory by said write means waits until said display cycle period switches to said non-display cycle period.
Claim 7
Dependent Claim
70 words
An information processing device according to Claim 1 further comprising a decode memory (370) for decoding and writing separate from said display memory, wherein said decode means writes the decoded pixel signal into said decode memory and transfers the pixel signal stored in said decode memory to said display memory during horizontal flyback period (B) and/or vertical flyback period (C) and/or the non-display cycle period of the display period (A).
Claim 8
Dependent Claim
34 words
An information processing device according to Claim 1 further comprising means (k₄) for interrupting updating of the display for a predetermined period after the end of the display of one page or one image.
Claim 9
Dependent Claim
27 words
An information processing device according to Claim 1 further comprising means (k₃) for interrupting display in a course of the display of one page or one image.
Claim 10
Dependent Claim
32 words
An information processing device according to Claim 1 further comprising means (k₂) for skipping pages other than the current page in a course of the display of one page or one image.
Claim 11
Dependent Claim
39 words
An information processing device according to Claim 1 further comprising print-out means (k₅), wherein when the print-out key is depressed in a course of the display of one page or one image, the page being decoded is printed out.
Claim 12
Dependent Claim
62 words
An information processing method comprising following steps: - decoding encoded text information to an original pixel information; - storing the decoded pixel signal; - writing the decoded pixel signal into a display memory; - reading the decoded pixel signal from said display memory; and - switching the writing and the reading for sequentially displaying the decoded pixel signal on a display device.
Claim 13
Dependent Claim
62 words
An information processing method comprising following steps: - decoding encoded text information to an original pixel information; - storing the decoded pixel signal; - writing the decoded pixel signal into a display memory; - reading the decoded pixel signal from said display memory; and - switching the writing and the reading for sequentially displaying the decoded pixel signal on a display device.
Claim 14
Dependent Claim
37 words
An information processing method according to Claim 11, wherein the decoded pixel signal is written into said display memory during horizontal flyback period (B) and/or vertical flyback period (C) of a non-display period of the display device.
Claim 15
Dependent Claim
59 words
An information processing method according to Claim 12, wherein when the access to said display memory by said write means and the access to said display memory by said read means compete, the access by said read means is prioritized and the access to said display memory by said write means waits until the end of the display period.
Claim 16
Dependent Claim
45 words
An information processing method according to Claim 11 wherein the display period (A) of said display device is divided into a display cycle period and a non-display cycle period, and the decoded pixel signal is written into said display memory during said non-display cycle period.
Claim 17
Dependent Claim
44 words
An information processing method according to Claim 14 wherein when said write means accesses said display memory during said display cycle period, the access to said display memory by said write means waits until said display cycle period switches to said non-display cycle period.
References Cited (Backward Citations)
No citation records indexed.
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