Use of PDLC Film for Improving Visualization of Contents in Holographic Display Under Different Illumination Scenarios

Abstract

Pepper's ghost effect has been used since its beginnings at the second half of XIX century to generate 3D projections of virtual people in real environments. Nowadays this effect is used by 'holographic' displays for the projection not only of virtual people but also of objects and even animations that can interact with real objects. Marketing and product presentations are some of the most used applications for these displays. Nevertheless, another interesting application is been explored recently: knowledge transfer for both industrial and educational purposes. Regardless the application there is a little problem with these displays: when they are used in a highilluminated place the contents projected are lost. That is the motivation for this project, which seeks to evaluate the use of a PDLC film (that allows to control its transmittance) to minimize these problem. Action research methodology is being used as a guideline for planning and executing the actions required in the project. The results were satisfactory; achieving an improvement in the visualizations of the contents displayed using the PDLC film.

Evaluation of Polymer Dispersed Liquid Crystal (PDLC) for Passive Rear Projection Screen Application

“…To the best of our knowledge, until now there has been no attempt to develop PDLC technology exclusively only for RPS applications. There have been only a few attempts in the literature to develop switchable PDLC technology for image display applications, including projection display light valve [38], pepper-ghost display [39], holographic display [40], image mode projection [41], high-definition TV [42], flexible LCD [43], and transparent projection screen [44].…”