49.3: H‐PDLC Color Separation Device for Image Capture Systems

Abstract

A novel device for separation of color image components in image capture systems is described. The device is based upon temporal switching of HPDLC elements with tunable spectral passbands. The device may be operated as either a reflective RGB color separation mirror or a transmissive CMY color separation filter. A breadboard color image capture system using this device for color separation has been developed and tested as a proof of concept.

Three-Dimensional Television

“…Over the years a lot of research is aimed to develop different unwrapping techniques [123], which should find the middle ground between alleviation of the computational burden and reduction of influence of the phase ambiguities [124]. The most popular phase unwrapping approaches [125,127,128,129,130,131,132] are based on solution of a unweighted or weighted least-squares problem [123,133]. The principal categorization of algorithms that attack the major error sources is proposed in [125,126], where three basic classes are outlined: i) Global class.…”

“…HPDLC enable color separation applicable also to image capturing [133]. HPDLC enable color separation applicable also to image capturing [133].…”

Liquid Crystals: A Unique Phase of Matter

“…One intriguing H-PDLC device is a novel configuration for color separation in image capture systems (e.g., still digital cameras and small video cameras) [Fiske and Silverstein (2000)]. The underlying operation of the device is based on the temporal switching of H-PDLC spectral passband reflection filters, analogous to those illustrated in Figure 1.33(a).…”

Mesoscale Three Dimensional Lattices Formed in Polymer Dispersed Liquid Crystals: A Diamond-Like Face Centered Cubic

“…A variety of new devices using H-PDLC have been proposed, including low-power color reflective displays [5][6][7], telecommunication switches [8,9], polarization selective projection components [10], switchable lenses [11], photonic crystals [12][13][14][15][16][17], mirrorless lasing [18], laser wavelength dosimetry badges [19], optical strain gauges [20], image capture systems [21], beam steering [22], optical data storage [23,24], remote sensing [25], active U-turn switches [26], and application specific lenses [27]. There have been many basic studies on optical behavior [28][29][30][31], electro-optic switching [32], liquid crystal ordering [33], and polymer morphologies [34][35][36].…”

“…Within the last few years, a number of new configurations have been reported, such as those based on polymer networks [37][38][39], polarization independent switching configurations [40], smectic-A phases [41], two-photon induced polymerization renditions [42], tunable reflection modes [43], specialized holographic methods [44][45][46], diffuse reflection modes [47], azo-dye doped PDLCs [48,49], thermal switching modes [50], and total internal reflection configurations [51]. Figure 1(a) illustrates how a red, green, blue H-PDLC stack (electrically switchable color filter stack) can be used in digital imaging using a single CCD [21] and Figure 1(b) illustrates the operation of a four-channel add-drop filter for telecommunication applications [22]. These are only two examples of the potential application of electrically switchable filters=gratings based on H-PDLC technology.…”