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RGBW LCD driver offers backlight power savings

Posted: 04 Dec 2008     Print Version  Bookmark and Share

Keywords:display technology  RGBW architecture  QVGA resolution  power savings 

Leadis Technology Inc. has made available samples of the LDS291 supporting VP Dynamics' advanced VPW RGBW display technology. The RGBW architecture allows the LDS291 to provide two modes of operation—a physical QVGA resolution mode and a virtual VGA resolution mode using a pixel density equivalent to conventional QVGA resolution. The combination overcomes limitations associated with other RGBW pixel schemes, allowing for excellent Asian character text rendering and enhanced image/video resolution, claims Leadis.

The LDS291 offers backlight power savings of over 40 per cent in physical mode and 70 per cent in virtual mode. It also offers Super Power Saving (SPS) mode and Dynamic Backlight Control (DBC) mode to further maximise savings in power consumption. The SPS mode and DBC functions each provide an additional 10-20 per cent reduction in backlight power consumption.

The 262,000 colour LDS291 is targeted at small to mid-sized TFT displays supporting QVGA to virtual VGA applications. According to Leadis, the LDS291 is suitable for devices requiring vivid colour display with very low power consumption, such as mobile phone, portable navigation device, personal media player, electronic dictionary and other handheld applications. In order to broaden its appeal, the device is compliant with MPU, RGB, and MIPI DSI interfaces.

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