Abstract
Projection system based on Liquid-Crystal Displays (LCDs) offer new opportunities to display high definition and large size TV images. In order to increase LCD projectors performances, in particular the brightness and optical efficiency, we propose to introduce Holographic Optical Elements (HOEs) in the optical architecture of the projector. Due to their spectral bandpasses, phase volume HOEs are very well suited to the design of dichroic components. These components are, for example, either dichroic mirrors with specific polarization and 16/9 anamorphic properties in a 3-LCD architecture, or dichroic micro-lenses for selective focusing in a single-LCD architecture. First, this paper analyzes the conditions that must be fulfilled by the HOEs in LCD projection systems. It concerns spectral and angular bandpass and colorimetric properties in the presence of white light illumination. Then, examples of phase volume HOEs (mirrors and lenses) satisfying those conditions are presented. A complete colorimetric analysis is achieved with red, green and blue holographic lens characteristics in a single-LCD architecture. Also an evaluation of the gain of luminous flux obtained by using these components in place of classical color filters is presented. Our HOEs have been recorded in a photopolymer from DuPont corporation.
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