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EP0385449A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Color liquid crystal display control apparatus

Assignee: Toshiba Corp
•
Filing: 1990-02-28
•
Granted: —
•
Expires: 2010-02-28
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Abstract

Abstract A color liquid crystal display control apparatus in a personal computer to which a CRT display unit can be arbitrarily connected and which has a color liquid crystal display as a standard equipment, includes a first pallet (3) for converting color data supplied from a video RAM into 256 color display data, a second pallet (5) for converting the 256 color display data output from the first pallet into 256K color display data for the CRT, and a third pallet (13) for converting the 256 color display data output from the first pallet into 16 color display data for the color liquid crystal display. The color liquid crystal display control apparatus also includes a conversion circuit (21) for automatically updating the contents of the third pallet upon updating of the contents of the second pallet by an application program.

Inventors

  • 👤 Hiroshi C/O Intel. Prop. Div. Uchikoga

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-01 12:35
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/14; G06F3/147; G06F3/1475; G09; G09G; G09G3/00; G09G3/04; G09G3/16; G09G3/18; G09G3/20; G09G3/34; G09G3/36; G09G5/00; G09G5/02; G09G5/06

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 130 words
A color liquid crystal display control appara­tus in a personal computer to which a cathode ray tube (CRT) unit can be arbitrarily connected and which has a color liquid crystal display as a standard equipment, characterized by comprising: first pallet means (3) for converting display data designated by software into color display data; second pallet means (5) for performing conversion into color display data for said cathode ray tube (CRT) unit on the basis of the color display data converted by said first pallet means; and third pallet means (13) for performing conversion into color data for said color liquid crystal display to display a specific number of color data on said color liquid crystal display on the basis of the color display data converted by said first pallet means.
Claim 2
Dependent Claim 130 words
A color liquid crystal display control appara­tus in a personal computer to which a cathode ray tube (CRT) unit can be arbitrarily connected and which has a color liquid crystal display as a standard equipment, characterized by comprising: first pallet means (3) for converting display data designated by software into color display data; second pallet means (5) for performing conversion into color display data for said cathode ray tube (CRT) unit on the basis of the color display data converted by said first pallet means; and third pallet means (13) for performing conversion into color data for said color liquid crystal display to display a specific number of color data on said color liquid crystal display on the basis of the color display data converted by said first pallet means.
Claim 3
Dependent Claim 42 words
An apparatus according to claim 1, charac­terized by further comprising: means (23, 25) for updating contents of said second pallet means; and means (21) for updating contents of said third pallet means upon updating of the contents of said second pallet means.
Claim 4
Dependent Claim 33 words
An apparatus according to claim 1, charac­terized in that said means for updating the contents of said third pallet means comprises means for monitoring updating of the contents of said second pallet means.
Claim 5
Dependent Claim 41 words
An apparatus according to claim 1, charac­terized in that said third pallet means and said means for updating the contents of said third pallet means upon updating of the contents of said second pallet means comprise a one-chip high-integration semiconductor element.
Claim 6
Dependent Claim 39 words
An apparatus according to claim 1, charac­terized in that said third pallet means converts color display data from said first pallet means into color display data having colors of a number smaller than that of said second pallet means.

References Cited (Backward Citations)

DE3514821A1 Cited
US4766430A Cited

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