LCD controllers with embedded memory

3 July 2002 Opto-Electronics

External SRAM and DRAM in LCD controller designs are no longer needed. Epson now embeds memory in its latest LCD controllers.

For medium-sized panels the SED137X series has internal SRAM to support VGA greyscale or smaller resolutions in colour up to 16 bits/pixel. Larger LCDs require the SED1386 with 1,2 MB of DRAM supporting SVGA or XGA. Epson also endows its controllers with advanced features: portrait mode displays enjoy direct hardware rotation of display data five times faster than by software; virtual screen, split screen and picture-in-picture modes are available. Top-of-the-range controllers offer hardware acceleration for bit-block transfers, some with built-in USB client interface and simultaneous display of two independent display outputs. A digital camera input can also be provided.

The controllers are compatible with a wide range of CPUs including SH3/4, 68K, MIPS, ARM and PowerPC and have the expected Epson low-power and low-voltage capability.

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