US 2003/0117349 A1 · Address generator for video pixel reordering in reflective LCD

Abstract

An address generator for a pixel shuffler used in a relective liquid crystal display (RLCD) digital video system, and a pixel shuffler incorporating such an address generator. The address generator includes a small, dual port SRAM 160×8, a combinatorial converter having a pair of inputs and an output representing a predetermined relationship of the inputs, a pixel counter with a pair of decoders, a line counter, a computing block for selectively implementing a mirror reflection of the pixel addresses, as well as a plurality of D flip flops and logic elements. The pixel shuffler operates in read-modify-write mode, whereby any address location of memory is read and immediately overwritten with the new data. This permits operation with only one bank of SRAM 320×96 rather than the customary two banks for prior art pixel shufflers using the so-called Ping Pong method.

Claims13

Dependent claims

In a pixel shuffler for performing a matrix transposition of data representing each of a plurality of video lines for a Reflective Liquid Crystal Display (RLCD) panel, an address generator for video pixel reordering within each of said lines, said address generator comprising:

a) an SRAM storing a sequence of pixel addresses for successive video lines for said RLCD panel and having at least one address input, a data input and at least one data output;
b) a combinatorial converter for converting an address value of a current video line to a corresponding address value of a successive video line;
c) a first buss connecting said converter output to said SRAM data input, whereby data from said SRAM is converted and written back to said SRAM;
and
d) a second buss connecting said at least one SRAM data output to a memory bank of said pixel shuffler, whereby said second buss delivers an address from said memory bank read-modify-write mode to operate upon a video pixel data stream permitting operation of said pixel shuffler with said memory bank requiring a limited capacity relative to conventional pixel shuffler memories.

2 more elements

Dependencies are inferred from the claim text.

Address generator for video pixel reordering in reflective LCD

Life of this patent

Address generator for video pixel reordering in reflective LCD

Life of this patent

Abstract

Claims13