EP0105725A2
Expired / Lapsed
EP
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Display unit
Assignee: Fanuc Corp
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Filing: 1983-09-29
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Granted: —
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Expires: 2003-09-29
Abstract
Abstract In a display unit data for rewriting a picture memory (4 or 5) is prepared in a work memory (8) and the data is transferred to the picture memory (4 or 5) utilizing the vertical blanking period of the picture being displayed on the screen (9). When the amount of data to be transferred is large, the data transfer is continued beyond the vertical blanking period and during the data transfer the display on the screen is inhibited.
Inventors
- 👤 Yoshiaki Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 08:45
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/001; G09G5/40; G09G5/36; G09G5/39
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
105 words
A display unit in which the content of a picture memory is cyclically read out by a scanning address of a CRT controller to obtain a video signal when the display unit is in use, comprising: a work memory for storing data for rewriting the picture memory; data transfer means started by a vertical synchronizing signal of the CRT controller to read out the data from the work memory and to transfer the data to the picture memory in the vertical blanking period; and an address switching circuit for switching address outputs of the data transfer means and the CRT controller to the picture memory.
Claim 2
Dependent Claim
105 words
A display unit in which the content of a picture memory is cyclically read out by a scanning address of a CRT controller to obtain a video signal when the display unit is in use, comprising: a work memory for storing data for rewriting the picture memory; data transfer means started by a vertical synchronizing signal of the CRT controller to read out the data from the work memory and to transfer the data to the picture memory in the vertical blanking period; and an address switching circuit for switching address outputs of the data transfer means and the CRT controller to the picture memory.
Claim 3
Dependent Claim
65 words
A display unit according to claim 1, further comprising means for deciding whether the amount of data to be transferred is larger than a predetermined value, and control means for permitting a data transfer beyond the vertical blanking period and inhibiting a display during the data transfer when it is decided that the amount of data to be transferred is larger than the predetermined value.
References Cited (Backward Citations)
No citation records indexed.
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