Beam steering for virtual/augmented reality displays with a cycloidal diffractive waveplate.

We proposed a switchable beam steering device with cycloidal diffractive waveplate (CDW) for eye tracking in a virtual reality (VR) or augmented reality (AR) display system. Such a CDW diffracts the incident circularly polarized light to the first order with over 95% efficiency. To convert the input linearly polarized light to right-handed or left-handed circular polarization, we developed a broadband polarization switch consisting of a twisted nematic liquid crystal cell and an achromatic quarter-wave retardation film. By cascading 2-3 CDWs together, multiple diffraction angles can be achieved. To suppress the color dispersion, we proposed two approaches to obtain the same diffraction angle for red, green, and blue LEDs-based full color displays. Our device exhibits several advantages, such as high diffraction efficiency, fast response time, low power consumption, and low cost. It holds promise for the emerging VR/AR displays.

[1]  Shin-Tson Wu,et al.  Nematic liquid crystal modulator with response time less than 100 μs at room temperature , 1990 .

[2]  Vasile Rotar,et al.  Polarization-controlled switching between diffraction orders in transverse-periodically aligned nematic liquid crystals. , 2006, Optics letters.

[3]  M. Schadt,et al.  Voltage-Dependent Optical Activity of a Twisted Nematic Liquid Crystal , 1971 .

[4]  Chulwoo Oh,et al.  Achromatic diffraction from polarization gratings with high efficiency. , 2008, Optics letters.

[5]  Jason Heikenfeld,et al.  Agile wide-angle beam steering with electrowetting microprisms. , 2006, Optics express.

[6]  Xin Wang,et al.  Characteristics of LCoS Phase-only spatial light modulator and its applications , 2004 .

[7]  Robert J. K. Jacob,et al.  Interacting with eye movements in virtual environments , 2000, CHI.

[8]  Seth Johnson,et al.  Liquid crystal waveguides: new devices enabled by >1000 waves of optical phase control , 2010, OPTO.

[9]  K. T. Huang,et al.  P‐107: The Fastest Response TN‐Type TFT LCD of the World Likes OCB Level , 2007 .

[10]  Nelson V. Tabiryan,et al.  OPTICAL AXIS GRATINGS IN LIQUID CRYSTALS AND THEIR USE FOR POLARIZATION INSENSITIVE OPTICAL SWITCHING , 2009 .

[11]  Michael J. Escuti,et al.  Wide-angle nonmechanical beam steering using thin liquid crystal polarization gratings , 2008, Optical Engineering + Applications.

[12]  Shin-Tson Wu,et al.  Dual frequency liquid crystals: a review , 2009 .

[13]  Masayuki Yokota,et al.  Polymer-stabilized liquid crystal blue phases , 2002, Nature materials.

[14]  Peter Young.  Virtual Reality Systems , 2007 .

[15]  K. Johnson,et al.  Smart spatial light modulators using liquid crystals on silicon , 1993 .

[16]  Byungki Kim,et al.  White‐Light‐Emitting Diodes with Quantum Dot Color Converters for Display Backlights , 2010, Advanced materials.

[17]  R. Dabrowski,et al.  Fast Switching Liquid Crystals for Color-Sequential LCDs , 2007, Journal of Display Technology.

[18]  Yukihiro Nishida,et al.  Design of Primaries for a Wide-Gamut Television Colorimetry , 2010, IEEE Transactions on Broadcasting.

[19]  Shin‐Tson Wu,et al.  A Fringe Field Switching Liquid Crystal Display With Fast Grayscale Response Time , 2015, Journal of Display Technology.

[20]  Shin-Tson Wu,et al.  Ultra-low viscosity liquid crystal materials , 2015 .

[21]  Henry Been-Lirn Duh,et al.  Trends in augmented reality tracking, interaction and display: A review of ten years of ISMAR , 2008, 2008 7th IEEE/ACM International Symposium on Mixed and Augmented Reality.

[22]  Martin S. Banks,et al.  A stereo display prototype with multiple focal distances , 2004, ACM Trans. Graph..

[23]  U Efron,et al.  Birefringence measurements of liquid crystals. , 1984, Applied optics.

[24]  R. Muller,et al.  Surface-micromachined mirrors for laser-beam positioning , 1996 .

[25]  Shin-Tson Wu,et al.  High performance liquid crystal displays with a low dielectric constant material , 2014 .

[26]  Martin S. Banks,et al.  A stereo display prototype with multiple focal distances , 2004, SIGGRAPH 2004.

[27]  Kenneth Holmqvist,et al.  Eye tracking: a comprehensive guide to methods and measures , 2011 .

[28]  Shin-Tson Wu,et al.  Realizing Rec. 2020 Color Gamut with Quantum Dot Displays Color Shift Reduction of a Multi-domain Ips-lcd Using Rgb-led Backlight, " Opt , 2022 .

[29]  Edward A. Watson,et al.  A Review of Phased Array Steering for Narrow-Band Electrooptical Systems , 2009, Proceedings of the IEEE.

[30]  Nelson V. Tabiryan,et al.  The principles of laser beam control with polarization gratings introduced as diffractive waveplates , 2010, Organic Photonics + Electronics.

[31]  Gabriella Cipparrone,et al.  Highly efficient liquid crystal based diffraction grating induced by polarization holograms at the aligning surfaces , 2006 .

[32]  Shin-Tson Wu,et al.  Switchable focus using a polymeric lenticular microlens array and a polarization rotator. , 2013, Optics express.

[33]  Shin‐Tson Wu,et al.  High-speed liquid-crystal modulators using transient nematic effect , 1989 .

[34]  Tae-Hoon Yoon,et al.  Fast switching technologies for a nematic liquid crystal cell , 2011, OPTO.

[35]  Shin-Tson Wu,et al.  A fast-response A-film-enhanced fringe field switching liquid crystal display , 2015 .

[36]  Nelson V. Tabiryan,et al.  The Promise of Diffractive Waveplates , 2010 .

[37]  Shin‐Tson Wu,et al.  Wide color gamut LCD with a quantum dot backlight. , 2013, Optics express.

[38]  Shin-Tson Wu,et al.  Polymeric-lens-embedded 2D/3D switchable display with dramatically reduced crosstalk. , 2014, Applied optics.

[39]  Shin-Tson Wu,et al.  Submillisecond Gray-Level Response Time of a Polymer-Stabilized Blue-Phase Liquid Crystal , 2010, Journal of Display Technology.

[40]  Walter M. Duncan,et al.  Emerging digital micromirror device (DMD) applications , 2003, SPIE MOEMS-MEMS.

[41]  J. Rolland,et al.  Head-worn displays: a review , 2006, Journal of Display Technology.

[42]  Landa Hoke,et al.  Polarization insensitive imaging through polarization gratings. , 2009, Optics express.

[43]  Chun-Ho Chen,et al.  A Field Sequential Color LCD Based on Color Fields Arrangement for Color Breakup and Flicker Reduction , 2007, Journal of Display Technology.

[44]  Jun Li,et al.  Refractive indices of liquid crystals for display applications , 2005, Journal of Display Technology.

[45]  Anand K. Gramopadhye,et al.  Binocular eye tracking in virtual reality for inspection training , 2000, ETRA.

[46]  Boris Zeldovich,et al.  High-efficiency 1.5 microm thick optical axis grating and its use for laser beam combining. , 2007, Optics letters.

[47]  Giuseppe Molesini,et al.  Viscous Behavior of Fused Silica at Room Temperature , 2010 .

[48]  Borko Furht,et al.  Handbook of Augmented Reality , 2011 .