9.3: High Contrast Color Splitting Architecture Using Color Polarization Filters

Robinson, Michael G.; Korah, John; Sharp, Gary D.; Birge, Jonathan R.

doi:10.1889/1.1833107

Cited by 21 publications

(10 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9 Historically, the ColorQuad ® . 10 was the first architecture of this genre to be demonstrated and commercially implemented. 11 More recently, improvements in PBS coating performance have enabled a higher-transmitting, higher-contrast architecture with more chromatically neutral performance.…”

Section: Introductionmentioning

confidence: 99%

Three-panel LCOS projection systems

Robinson¹,

Chen²,

Sharp³

2006

J. Soc. Inf. Display

Self Cite

View full text Add to dashboard Cite

-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...

show abstract

Section: Introductionmentioning

confidence: 99%

Three-panel LCOS projection systems

Robinson¹,

Chen²,

Sharp³

2006

J. Soc. Inf. Display

Self Cite

View full text Add to dashboard Cite

show abstract

“…The illumination is polarized using a sheet polarizer. A ColorLink green/magenta (G/M) retarder [4] rotates the polarization of green light with respect to blue and red, thus providing a very compact means of obtaining color separation using a single PBS.…”

Section: Polarization Opticsmentioning

confidence: 99%

5.3: LCD Projection Image Source for Head‐Up Display

Brown¹,

Greer²

2001

Symp Digest of Tech Papers

View full text Add to dashboard Cite

This paper describes the performance requirements, design, and fabrication of a LCD projection image source for use in a wide field of view head-up display (HUD) optical system. The LCD projector replaces the commonly used CRT, with the intended benefits of lower cost, multicolor, improved raster brightness, and digital interface. Predicted and measured results are reported, with descriptions of the key technical challenges.

show abstract

“…Conventional LCoS designs comprise two main methods: One employs three LCoS panels for three primary colors, respectively [1,2], and the other uses timesequential LCoS (color sequential) [3,4]. However, three-panel LCoS-based projectors have the disadvantages of bulky size, high cost, and complex optical structure, while CS-LCoS has limitations on bandwidth and image response time.…”

Section: Introductionmentioning

confidence: 99%

Design of an elliptic spot illumination system in LED-based color filter–liquid-crystal-on-silicon pico projectors for mobile embedded projection

Chen

2012

Appl. Opt.

View full text Add to dashboard Cite

We present an elliptic spot illumination system for a color filter-liquid-crystal-on-silicon (CF-LCoS) pico projector employing a specifically designed free-form lens and a cylindrical lens to improve on previous designs in terms of optical efficiency while yielding an ultracompact and low-cost optical architecture. The detailed design description of the optical system is thoroughly investigated. Simulation results coincide well with the theoretical calculation. The single 1 mm×1 mm LED chip-powered optical engine, which employs a CF-LCoS panel with a diagonal of 0.28 in and an aspect ratio of 4:3, has an estimated output efficiency over 9.8% (11.8 lm@1 W) and an ANSI 9-point uniformity over 88.5%, with the ultrasmall volume 24 mm×19 mm×7 mm. Compared to the circular spot-illuminated projection system, a total increment of about 23% of system efficiency is available with this improved optical engine. It is believed that there would be a huge market potential to commercialize our design.

show abstract

9.3: High Contrast Color Splitting Architecture Using Color Polarization Filters

Cited by 21 publications

References 1 publication

Three-panel LCOS projection systems

Three-panel LCOS projection systems

5.3: LCD Projection Image Source for Head‐Up Display

Design of an elliptic spot illumination system in LED-based color filter–liquid-crystal-on-silicon pico projectors for mobile embedded projection

Contact Info

Product

Resources

About