Current technology of color generation is based on the mixing of RGB colors emanating from different light sources and/or pixels.Unfortunately,simple mixing of RGB emitter molecules cannot provide the desired color mixing since the energy transfer between the RGB molecules are universal and unavoidable,which demands macroscopically isolated sub-pixels for the color mixed pixel.If we can find a way to completely block the energy transfer between different RGB molecules,it will make a Holy Grail for the color mixing in the molecular level.In this presentation,I will demonstrate this innovative concept of molecular pixel which has recently been realized in my group by using functional molecules harnessing the process of excited-state intramolecular proton transfer (ESIPT).[1,2]