10.4: High‐Performance LCoS Optical Engine Using Cartesian Polarizer Technology

Bruzzone, Charles L.; Jiaying, James; Aastuen, D. J. W.; Eckhardt, Stephen K.

doi:10.1889/1.1832221

Cited by 12 publications

(15 citation statements)

References 3 publications

(2 reference statements)

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“…10, the blue transmission of the core is closely approximated by the product of the individual component angle averaged transmissions and expressed as (7) By using the typical component values of Table 1, a relative core transmission of~52% is obtained.…”

Section: Macneille-based 3xpbs/x-cube Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Conventional systems use MacNeille-type PBS cubes, whereas more recent systems use either wire-grid PBS plates 6 or embedded reflective polarizing films. 7 The former modified PBS system is often termed Ultrex after developments by ADO, 6 whereas the latter is known as Vikuiti™ after its development by 3M.A more-radical approach to LCOS projection is to utilize retarder stack filters a (RSFs), 8 which transform polarization in a color-selective manner. These laminates of stretched durable polycarbonate polymer can controllably manipulate the polarization of one color while retaining that of another.…”

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confidence: 99%

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Three-panel LCOS projection systems

Robinson¹,

Chen²,

Sharp³

2006

J. Soc. Inf. Display

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-Three-panel liquid-crystal-on-silicon (LCOS) projection systems are presented with an emphasis on the commercially successful shared retarder-stack-filter (RSF) polarizing-beam-splitter (PBS) architectures. The design and operation of the specific CQ90 projection core is presented in detail, and its contrast and transmission derived. alternative three-PBS/X-cube LCOS architectures are briefly introduced and their performance is compared to that of the CQ90.Keywords -Liquid crystal on silicon, rear-projection television, ColorQuad, ColorSelect, retarder stack polarization optical filter. IntroductionLiquid-crystal-on-silicon (LCOS) microdisplay technology offers the greatest performance/cost ratio of all display technologies by combining the high resolution and performance of silicon VLSI with controlled liquid-crystal optical modulation. To view directly in the form of a conventional TV-like display, one or more LCOS display panels need to be projected onto a viewable screen, as shown in Fig. 1. 1 LCOS projection is non-trivial since the panels are reflective. Modulated light forms a reflected beam with a spatially varying polarization state, which occupies the same region of space as the uniform input illuminating light. Physically separating these beams while maintaining good polarization integrity required for high contrast is demanding, particularly in multiple-panel systems where color separation is also necessary. One of the first attempts at three-panel LCOS projection used a polarizing beam splitter (PBS) to separate input and output light prior to RGB color separation and recombination. 2 A Philips prism (of the type found in early threecolor TV cameras) was used for the color management but proved unsuccessful due to polarization mixing at oblique "skew" incident angles. 3 A more successful attempt separates color first, such that a single primary-color beam is directed onto and away from its modulating panel before its recombination and projection. Input beams are thus separately incident upon each panel, allowing near-equivalent architectures to the established transmissive LC system 4 to be adopted. This generic approach uses dichroic plates to separate color within the illumination before utilizing PBSs to direct light onto and away from the panels. Recombination of the imaged light is carried out with an X-cube. A variation on this approach uses angular separation of the input and output beams in an off-axis configuration. 5 This last approach has, to date, suffered from low contrast and difficulties with the registration of the individual panel images, making it less mainstream and will not be discussed further here. Of the generic 3xPBS/X-cube on-axis architectures, there are three distinct types differing in the type of PBS used. Conventional systems use MacNeille-type PBS cubes, whereas more recent systems use either wire-grid PBS plates 6 or embedded reflective polarizing films. 7 The former modified PBS system is often termed Ultrex after developments by ADO, 6 whereas the latter i...

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Section: Macneille-based 3xpbs/x-cube Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Three-panel LCOS projection systems

Robinson¹,

Chen²,

Sharp³

2006

J. Soc. Inf. Display

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“…The multilayered optical-film Cartesian PBS introduced by 3M promises to be an important positive development for all LCoS projection display systems. 9 We conducted experiments with a Cartesian PBS and results are discussed below. Incorporation of such a PBS into the lightguide engine was not yet fully examined.…”

Section: Multilayered Optical-film Cartesian Pbsmentioning

confidence: 99%

A single-panel LCoS engine based on light guides

Shimizu¹,

Janssen²,

Shahzad³

2006

J. Soc. Inf. Display

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Abstract— By using light‐guide components, a new scrolling‐color engine for single‐panel LCoS projection has been developed. Light guides allow for loss‐less delivery of light leading to a simpler and more‐compact system. Engine design and construction based on a single 0.88‐in.‐diagonal LCoS panel is described. Separate results with a multilayer optical film Cartesian PBS show that a significant improvement in system efficiency is possible.

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“…11 In addition, polarizing performance of this PBS technology enables high contrast images without the use of a clean-up polarizer, improving system efficiency. The Vikuiti TM PBS is comprised of hundreds of layers of slightly birefringent polymer sheets joined together to form a single polarizing component.…”

Section: Polarization Control Near Panelmentioning

confidence: 99%