EP0300509A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Display apparatus capable of simultaneously displaying a television picture and a compressed display page of character and graphics data
Assignee: Panasonic Holdings Corp
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Filing: 1988-07-25
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Granted: —
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Expires: 2008-07-25
Abstract
Abstract A character and graphics display device for displaying character and graphics data which includes a receiving circuit (3) for deriving the character and graphics data from a signal carrying that data encoded therein, a memory (4) for storing the received data, a decoder circuit (32) for decoding the encoded data into suitable form for transfer to a display device, and a display memory (7) for temporarily storing this decoded data, further includes compression circuits (12, 13, 14) for converting the decoded data into a form whereby patterns represented by that data are displayed in compressed size. Pattern and graphics data can thereby be displayed together with other data such as a television picture, or a number of pages of the character and graphics data can be displayed simultaneously.
Inventors
- 👤 Ken Sakamoto
- 👤 Hidemi Henmi
- 👤 Tomoji Kondo
- 👤 Hiroyasu Shimbo
- 👤 Shin Fukuda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 00:49
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/445; G; G09; G09G; G09G5/00; G09G5/36; G09G5/39; G09G5/391; G09G1/00; G09G1/06; G09G1/14; G09G1/16; H04N7/00; H04N7/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
152 words
In a character and graphics data display apparatus having a display device, receiving circuit means for receiving a signal carrying encoded therein character and graphics data, said character and graphics data including display control data, data memory means for storing said character and graphics data received by said receiving circuit means, data decoding means for decoding said character and graphics data to obtain character and graphics picture data, display memory means for temporarily storing said character and graphics picture data, and display processing circuit means for processing said stored character and graphics picture data to suitable form for display by said display device, the improvement comprising conversion means for converting said character and graphics picture data, prior to storage in said display memory means, to compressed character and graphic picture data representing a display picture having a display density which is different from a display density specified by said display control data.
Claim 2
Dependent Claim
152 words
In a character and graphics data display apparatus having a display device, receiving circuit means for receiving a signal carrying encoded therein character and graphics data, said character and graphics data including display control data, data memory means for storing said character and graphics data received by said receiving circuit means, data decoding means for decoding said character and graphics data to obtain character and graphics picture data, display memory means for temporarily storing said character and graphics picture data, and display processing circuit means for processing said stored character and graphics picture data to suitable form for display by said display device, the improvement comprising conversion means for converting said character and graphics picture data, prior to storage in said display memory means, to compressed character and graphic picture data representing a display picture having a display density which is different from a display density specified by said display control data.
Claim 3
Dependent Claim
89 words
A character and graphics data display apparatus according to claim 1, in which said character and graphics data includes pattern data corresponding to bi-state picture elements of a display picture, and in which said conversion means comprises first compression means for converting each of a plurality of sets of data elements of said pattern data, respectively corresponding to rectangular arrays of m₁ by m₂ of said picture elements, to a corresponding single data element in said compressed pattern and graphic picture data, where m₁ and m₂ are positive integers.
Claim 4
Dependent Claim
96 words
A character and graphics display apparatus according to claim 2, in which each of said pattern data elements selectively represents an "on" and and "off" display state of a corresponding picture element, and in which said conversion is executed for each of said sets by establishing the display "on" state for said corresponding single data element if at least one data element of said each set represents the display "on" state, and establishing the display "off" state for said corresponding single data element if all data elements of said each set represents the display "off" state.
Claim 5
Dependent Claim
60 words
A character and graphics data display apparatus according to claim 1, in which said character and graphics data includes character code data, and in which said conversion means includes second compression means comprising character generator means responsive to said character code data for generating character pattern data for producing display of character patterns of compressed size by said display means.
Claim 6
Dependent Claim
91 words
A character and graphics data display apparatus according to claim 1, in which said character and graphics data includes attribute data for specifying display attributes, said attribute data comprising attribute data elements respectively corresponding to predetermined display regions of said display device, and in which said conversion means comprises third compression means for converting each of a plurality of sets of said attribute data elements, respectively corresponding to rectangular array of n₁ by n₂ of said display regions, to a single attribute data element, where n₁ and n₂ are positive integers.
Claim 7
Dependent Claim
54 words
A character and graphics data display apparatus according to claim 5, in which said conversion is executed for each of said sets of attribute data elements by determining a type of attribute data element which is in the majority in said each set, and assigning said type to said corresponding single attribute data element.
Claim 8
Dependent Claim
39 words
A character and graphics data display apparatus according to claim 1, in which a single page of said character and graphic picture data are transferred from said display memory to be displayed at one time by said display device.
Claim 9
Dependent Claim
38 words
A character and graphics data display apparatus according to claim 1, in which a plurality of pages of said character and graphic picture data are transferred from said display memory to be displayed simultaneously by said display device.
References Cited (Backward Citations)
No citation records indexed.
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