US 2007/0165015 A1 · Efficient use of synchronous dynamic random access memory

Abstract

DDR_SDRAM chips running at 1.5 clock rate are used for transferring image data from an image data source to a source driver in a display panel. In general, P DDR_SDRAM chips running at a 1.5 clock rate are used to store frame data in N frames. If the frame date in each of the N frames is n bits and the memory space in the DDR_SDRAM chip is m, then P is a smallest integer equal to or greater than N multiplied by (n/m). In data transfer in a frame, a line period is partitioned into N segments and each DDR-SDRAM chip is separated into (N−1) parts such that the parts are used to read different data in the different frames. In order to share I/O pins when using a number of DDR_SDRAM chips, the read/write sequence for the all DDR_SDRAM chips follows the same command and address.

Claims24

Dependent claims

A method for transferring frame data in N frames, said N frames comprising a current frame and (N−1) previous frame, comprising:

providing P memory chips for reading or writing the frame data in a line period;
and
separating each of the P memory chips into (N−1) parts so that each part is used to read a portion of frame data in a different one of the (N−1) previous frames and one part is used to write a portion of frame data in the current frame.

A method for transferring image data from an image data source to a source driver providing the image data to a display panel, wherein the image data is stored in the image data sources in N frames, said N frames comprising a current frame and (N−1) previous frames, each of the N frame having a data size of n bit, said method comprising:

providing P memory chips for reading or writing the frame data in a line period;
separating each of the P memory chips into (N−1) parts so that each part is used to read a portion of frame data in a different one of the (N−1) previous frames and one part is used to write a portion of frame data in the current frame, wherein each of the P memory chips has a memory space of m bits, and wherein P is an integer greater than or equal to N multiplied by (n/m);
and
transferring the frame data in N frames to the source driver.

1 more element

Dependencies are inferred from the claim text.

Efficient use of synchronous dynamic random access memory

Life of this patent

Efficient use of synchronous dynamic random access memory

Life of this patent

Abstract

Claims24