High-frame-rate liquid crystal phase modulator for augmented reality displays

Chen, Ran; Huang, Yuge; Li, Jian; Hu, Minggang; Li, Juanli; Chen, Xinbing; Chen, Pei; Wu, Shin‐Tson

doi:10.1080/02678292.2018.1499971

Cited by 19 publications

(17 citation statements)

References 29 publications

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“…High pixel density (~7000 ppi) 4K2K LCoS IC backplane suffers from low driving voltage (<3.3 V) limitations. The recently reported fast response time LCoS with PCM-2-01, L1, MCRI or UCF-L1 also requires at least 4~6 V driving voltage [22][23][24][25][26]. In this paper, we revealed a novel 1.2-inch 4K2K TN amplitude-type LCoS microdisplay (PCU-3-02-MD) with 1-ms RT under 5.0 V for displays.…”

Section: Introductionmentioning

confidence: 84%

66‐3: Submillisecond‐Response 10‐Megapixel 4K2K LCoS for Microdisplay and Spatial Light Modulator

Yang

Chen

Huang

et al. 2019

Symp Digest of Tech Papers

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The NCTU PCU-3-02 10-megapixel 4K2K (max. 4160x2464) LCoS panels with LCM-1107 nematic LC were assembled and evaluated. The results of both 1.2-inch 4K2K (~4,000 PPI) amplitude type LCoS microdisplay and 0.7-inch 4K2K (~7,000 PPI) phase-only type LCoS spatial light modulator (SLM) can achieve 1~2 ms response time at T=45 o C. Meanwhile, the phase linearity, precision and accuracy of 4K2K LCoS-SLM were assessed in this work. These new LCoS schemes will potentially be utilized in color-sequential, holographic, virtual and augmented reality display.

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Section: Introductionmentioning

confidence: 84%

66‐3: Submillisecond‐Response 10‐Megapixel 4K2K LCoS for Microdisplay and Spatial Light Modulator

Yang

Chen

Huang

et al. 2019

Symp Digest of Tech Papers

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“…After several decades of intensive efforts, LCoS has finally reached several key milestones: (1) 4K2K resolution panels are commercially available and 8K4K prototypes have been demonstrated [108]; (2) presently, a pixel pitch as small as 2.5~3 µm has been developed, while 1 µm is desirable for AR displays; (3) new LC materials with a submillisecond response time for intensity modulation [46,58,59] and~2 ms response time for phase modulation at 40 • C [46,47] are available, enabling high-frame-rate LCoS with both analog and digital driving; (4) new methods are proposed to suppress the fringing field effect from a large-pixel design to the accommodation of small pixels [78]. Because of the abovementioned achievements and the merits of high fill factor, compact size and light weight, LCoS microdisplay has been integrated into several commercial AR headsets as an intensity modulator [86].…”

Section: Discussionmentioning

confidence: 99%

“…Here comes the second consideration on electrical properties-the resistivity which determines the voltage holding ratio. Although LCoS devices demand a lower LC resistivity (>10 12 Ω•cm) than the active matrix displays (>10 13 Ω•cm) [46,47], it still limits the LC component selection. Compounds with a large ∆ε would require multiple dipoles, which may lead to a compromised γ 1 .…”

Section: Lc Materials Optimization Strategiesmentioning

confidence: 99%

“…In summary, a delicate balance should be reached between high birefringence, high dielectric anisotropy, low melting point, low viscosity, high resistivity, and good UV stability according to the device configuration. The state-of-the-art LC material development reaches a submillisecond response time for VA [56][57][58] and MTN [46,59] LCoS at 40 • C, and a~2 ms response time for 2π phase modulation [46,47]. More than that, these optimization strategies and the developed materials could be applied to other LC phase modulation-based devices such as tunable lenses, scanners, tunable filters, and optically addressed spatial light modulators [60][61][62][63][64], which may be incorporated in AR systems in other ways.…”

Section: Lc Materials Optimization Strategiesmentioning

confidence: 99%

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Liquid-Crystal-on-Silicon for Augmented Reality Displays

Huang

Liao²,

Chen

et al. 2018

Applied Sciences

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In this paper, we review liquid-crystal-on-silicon (LCoS) technology and focus on its new application in emerging augmented reality (AR) displays. In the first part, the LCoS working principles of three commonly adopted LC modes—vertical alignment and twist nematic for amplitude modulation, and homogeneous alignment for phase modulation—are introduced and their pros and cons evaluated. In the second part, the fringing field effect is analyzed, and a novel pretilt angle patterning method for suppressing the effect is presented. Moreover, we illustrate how to integrate the LCoS panel in an AR display system. Both currently available intensity modulators and under-developing holographic displays are covered, with special emphases on achieving high image quality, such as a fast response time and high-resolution. The rapidly increasing application of LCoS in AR head-mounted displays and head-up displays is foreseeable.

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“…In addition, limited driving voltage in a high-resolution backplane often results in a slower LC response time. Lately, Wu's group reported that an average phase-to-phase response time of~2 ms can be achieved using high ∆n LCs in a thin cell gap of 1.7 µm at an operating voltage of 5 V at 40 • C [36,37]. The reported LCs can be used with 240 Hz frame rate without complicated overdrive or undershoot circuitries.…”

Section: Switching Time For Phase Modulationmentioning

confidence: 99%

Pursuing High Quality Phase-Only Liquid Crystal on Silicon (LCoS) Devices

et al. 2018

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Fine pixel size and high-resolution liquid crystal on silicon (LCoS) backplanes have been developed by various companies and research groups since 1973. The development of LCoS is not only beneficial for full high definition displays but also to spatial light modulation. The high-quality and well-calibrated panels can project computer generated hologram (CGH) designs faithfully for phase-only holography, which can be widely utilized in 2D/3D holographic video projectors and components for optical telecommunications. As a result, we start by summarizing the current status of high-resolution panels, followed by addressing issues related to the driving frequency (i.e., liquid crystal response time and hardware interface). LCoS panel qualities were evaluated based on the following four characteristics: phase linearity control, phase precision, phase stability, and phase accuracy.A phase-only spatial light modulator can be used as a key optical element for displays, adaptive optics for sensing, lithography, and telecommunication, as shown in Figure 2. The linearity of phase modulation, response time, phase precision, and phase stability are key characteristics for appraising or selecting phase-only LCoS-SLM panels for the applications designed. However, it is difficult to obtain a single LCoS possessing all the desired features for all applications. Their specification and performance optimization are application-driven. For example, response time is the current limitation in a holographic display. It may be more important than phase stability,

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High-frame-rate liquid crystal phase modulator for augmented reality displays

Cited by 19 publications

References 29 publications

66‐3: Submillisecond‐Response 10‐Megapixel 4K2K LCoS for Microdisplay and Spatial Light Modulator

66‐3: Submillisecond‐Response 10‐Megapixel 4K2K LCoS for Microdisplay and Spatial Light Modulator

Liquid-Crystal-on-Silicon for Augmented Reality Displays

Pursuing High Quality Phase-Only Liquid Crystal on Silicon (LCoS) Devices

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