US 5,596,349 AGranted

Image information processor

AssigneeSanyo Electric Co., Ltd.

InventorsMitsugu Kobayashi, Makoto Fujioka, Atsuyoshi Tanioka, Kazuhiko Moriwaki, Makoto Shimizu, Hisao Uehara

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Abstract

An image information processor for a liquid crystal display by a digital driver is intended to provide image display near to a source image by making continuous-tone image display by pseudo representations. The image information processor generates L-bit image display data based on P-bit source image data, L being less than P. Added to source image data of a picture element of the Nth frame (where N is a natural number of 2 or greater) is error data corresponding to the picture element of the (N-1)th frame at the same position as the picture element of the Nth frame. The high-order L bits of the P-bit data resulting from the addition are used as image display data of the picture element of the Nth frame and at least one bit of the remaining low-order bit data is held as error data of the picture element of the Nth frame. Thus, error data of a picture element of one frame is added to the same picture element of the next frame, thereby lessening the brightness difference between both the picture elements and smoothing a time change in brightness.

Claims7

Dependent claims

An image information processor for generating display data which is applied to a display to produce an image composed of a succession of frames, each frame containing an array of picture elements, or pixels, the display data for each pixel being composed of L image display bits, where L is a natural number equal to or greater than 2, and for causing the image to present pseudo representations of gradations represented by P image data bits, where P is a natural number greater than L, said image information processor comprising:

(a) addition means, when it is assumed that N is a natural number of 2 or greater, for adding error data of a picture element of an (N-1)st frame to the corresponding picture element data of an Nth frame;
(b) information selection means for outputting high-order L bits of P-bit data provided by said addition means as image display data of the Nth frame and at least one bit of the remaining (P-L) bits as error data of the picture element of the Nth frame;
(c) means for storing said error data;
(d) means for calculating a difference between source image data of the (N-1)st frame and the corresponding source image data of the Nth frame;
and
(e) comparison means for determining whether or not the difference exceeds a predetermined value, wherein when the difference exceeds the predetermined value, said information selection means does not output the image display data and outputs the high-order L bits of the source image data of the Nth frame as the image display data of the Nth frame.

3 more elements

(a) addition means, when it is assumed that N is a natural number of 2 or greater, for adding error data of a picture element of an (N-1)st frame to the corresponding picture element data of an Nth frame;
(b) information selection means for outputting high-order L bits of P-bit data provided by said addition means as image display data of the Nth frame and at least one of the high-order bits of the remaining (P-L) bits as error data of the picture element of the Nth frame;
(c) means for storing said error data;
and
(d) information clear means for clearing the error date every given number of frames.

2 more elements

Dependencies are inferred from the claim text.