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Renesas liquid crystal panel driver suits cellphones

Posted: 29 Sep 2003 ?? ?Print Version ?Bookmark and Share

Keywords:hd66784? liquid crystal panel driver? renesas technology? hd66777?

Suitable for use in cellphones, the HD66784 amorphous TFT color liquid crystal panel driver from Renesas Technology Corp. has a 260,000-color display capability, and enables simultaneous drive of a 176W224-pixel QCIF size main screen and a 176W96-pixel subscreen with a single chip.

The provision of approximately 126KB of on-chip display RAM offers 260,000-color display capability and enables high display quality to be achieved. Whereas cellphones equipped with a QCIF size main screen have previously required separate drivers for main screen and subscreen drive, the HD66784 allows both screens to be driven by a single chip.

An 8-color mode, standby mode, and deep standby mode are provided as functions for reducing power consumption. Use of these modes makes it possible to achieve a low subscreen standby power consumption, including panel consumption of 0.8mW that helps extend the standby battery life of cellphones and similar devices.

Connection to a PC is via an 8-, 9-, 16-, or 18-bit high-speed bus interface, and a built-in high-speed burst RAM write function enables efficient data transfer. DMA transfer single address mode is also supported, allowing smooth transfer of large volumes of data from external memory.

Logic power supply voltage is 2.5V to 3.3V, interface I/O voltage is 1.65V to 3.3V, and liquid crystal drive voltage is 4.5V to 5.5V.

The product is the successor to the company's HD66777 single-chip TFT liquid crystal driver that supports a 132W176-pixel main screen and 132W96-pixel subscreen.

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