A spatial optical modulation array device includes regularly packed micro optical-electrical-mechanical pixels in a planner configuration on a semiconductor substrate, each pixel electrically actuated independently and thus operated optically in the binary modes, reflection and diffraction to incident illumination. The light source is a light-emitting diode that emits light, and a fraction of that light will exit the light-recycling envelope through an aperture. The cleaning compound includes a viscous liquid with a viscosity between about 1 cP to about 10,000 cP.