EP0422294A1
Expired / Lapsed
EP
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Display system
Assignee: International Business Machines Corp
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Filing: 1989-10-12
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Granted: —
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Expires: 2009-10-12
Abstract
Abstract A display system (12) is presented, comprising an all points addressable display buffer (25), in which a pixel is represented by an n bit pixel word; and in which a display character is represented by a pixel matrix (32) comprising a plurality of pixels arranged in a plurality of pixel rows, a character font table (22) for storing a plurality of such character pixel matrices representative of display characters of a font, and control logic (21) responsive to a character code word (26) for selecting a desired pixel matrix from the character font table, wherein each pixel matrix is stored in the character font table in an m bit (m<n) per pixel format whereby the pixel is represented by an m bit word; and wherein the display system comprises translation means (23) for translating a pixel row arranged in the m bit pixel format (44) to a pixel row arranged in an n bit per pixel format (53) compatible with the APA display buffer.
Inventors
- 👤 Roger Timothy Wood
- 👤 Roy Bernard Harrison
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 17:58
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/36; G09G5/39; G09G5/393; G09G5/22; G09G5/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
162 words
A display system (12) comprising an all points addressable display buffer (25), in which a pixel is represented by an n bit pixel word; and in which a display character is represented by a pixel matrix (32) comprising a plurality of pixels arranged in a plurality of pixel rows, a character font table (22) for storing a plurality of such character pixel matrices representative of display characters of a font, and control logic (21) responsive to a character code word (26) for selecting a desired pixel matrix from the character font table, wherein each pixel matrix is stored in the character font table in an m bit (m<n) per pixel format whereby the pixel is represented by an m bit word; and wherein the display system comprises translation means (23) for translating a pixel row arranged in the m bit pixel format (44) to a pixel row arranged in an n bit per pixel format (53) compatible with the APA display buffer.
Claim 2
Dependent Claim
162 words
A display system (12) comprising an all points addressable display buffer (25), in which a pixel is represented by an n bit pixel word; and in which a display character is represented by a pixel matrix (32) comprising a plurality of pixels arranged in a plurality of pixel rows, a character font table (22) for storing a plurality of such character pixel matrices representative of display characters of a font, and control logic (21) responsive to a character code word (26) for selecting a desired pixel matrix from the character font table, wherein each pixel matrix is stored in the character font table in an m bit (m<n) per pixel format whereby the pixel is represented by an m bit word; and wherein the display system comprises translation means (23) for translating a pixel row arranged in the m bit pixel format (44) to a pixel row arranged in an n bit per pixel format (53) compatible with the APA display buffer.
Claim 3
Dependent Claim
42 words
A display system as claimed in claim 1 wherein the translation means has attribute combining logic by which the n bit pixel word can be changed in accordance with an n bit attribute word (41), for specifying an attribute of the pixel.
Claim 4
Dependent Claim
50 words
A display system as claimed in claim 2 wherein the translation means includes code transforming means wherein a first order m bit per pixel format (82), associated with a first memory structure, is transformed into a second order n bit per pixel format (83) associated with a second memory structure.
Claim 5
Dependent Claim
49 words
A display system as claimed in claim 3 wherein the translation means includes a translation table (71) wherein the pixel row arranged in the m bit per pixel format (70) corresponds exclusively to a pixel row in the n bit per pixel format (71) according to a translation requirement.
Claim 6
Dependent Claim
39 words
A display system as claimed in claim four wherein the attribute combining logic includes attribute determining means by which the n bit attribute word can be specified by an n bit pixel word stored in the APA display buffer.
Claim 7
Dependent Claim
33 words
A display system as claimed in claim 5 wherein the translation means includes a plurality of translation tables and a selection means for selecting a translation table in accordance with a translation requirement.
Claim 8
Dependent Claim
20 words
A display system as claimed in claim 6 wherein the n bit attribute word corresponds to the character code word.
Claim 9
Independent Claim
185 words
A method for translating a pixel matrix arranged in an m bit per pixel format for storage in a character font table into a pixel matrix arranged in an n bit per pixel format (m<n) compatible with a APA display buffer comprising, selecting a pixel row arranged in an m bit per pixel format of the pixel matrix from the character font table, exclusively mapping the pixel row arranged in the m bit per pixel format to a pixel row in the n bit per pixel format according to a translation requirement, using a translation table, transforming, where appropriate, a first order m bit per pixel format, associated with a first memory structure, into a second order n bit per pixel format associated with a second memory structure, using a translation table, changing an n bit pixel word representing a pixel in the pixel row arranged in the n bit per pixel format in accordance with an n bit attribute word for specifying an attribute of the pixel using attribute combining logic, storing the n bit pixel word in an all pels addressable display buffer.
Claim 10
Independent Claim
185 words
A method for translating a pixel matrix arranged in an m bit per pixel format for storage in a character font table into a pixel matrix arranged in an n bit per pixel format (m<n) compatible with a APA display buffer comprising, selecting a pixel row arranged in an m bit per pixel format of the pixel matrix from the character font table, exclusively mapping the pixel row arranged in the m bit per pixel format to a pixel row in the n bit per pixel format according to a translation requirement, using a translation table, transforming, where appropriate, a first order m bit per pixel format, associated with a first memory structure, into a second order n bit per pixel format associated with a second memory structure, using a translation table, changing an n bit pixel word representing a pixel in the pixel row arranged in the n bit per pixel format in accordance with an n bit attribute word for specifying an attribute of the pixel using attribute combining logic, storing the n bit pixel word in an all pels addressable display buffer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
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