the production of liquid crystal displays on plastic substrates is desirable over glass substrates so that the finished product is thinner , lighter , and more robust . plastic substrates can enable the use of new and different processing techniques which are not possible on glass such as roll - to - roll processing . this invention discusses an advancement which is laser cutting a plastic substrate and display layer . one aspect of the invention is laser cutting and welding together two or more plastic substrates and lcd layer therebetween from a larger sheet or roll of plastic lcds .