We develop innovative digital optical imaging devices with different resolutions. There are four basic systems in our product portfolio. These are an automatic cell counter and a multicolor epi-fluorescence microscope for low resolution desktop applications together with a structured illumination microscope (SIM) and a laser scanning confocal fluorescence microscope fo rhigh resolution fluorescence imaging applicaitons. Our general design philosophy is based on developing compact digital microscopes with small footprints and low-costs. For SIM and epi-fluorescence products, we are following laser-free approaches in our designs.