Projection display industry in Taiwan is constructed into three tiers: the upstream, the midstream and downstream. The associated companies and products involves cover a very wide range, from key components, to sub-assemblies, to final system products. In the past, the growth of midstream and down stream segments is limited by the supply shortage of key components. Till recently, some companies started to produce the imagers and light sources, the tension of component shortage is relieved. Very soon, the projection display industry in Taiwan will become next rising star industry after personal computer industry.