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Field-sequential color system

A field-sequential color system (FSC) is a color display or television technology that transmits or presents the primary colors—red, green, and blue—in successive fields or frames, relying on the persistence of vision to integrate them into a full-color image.^[1] This approach contrasts with simultaneous color systems, which render all colors at once using multiple electron guns or patterned screens.^[2] Developed primarily by CBS Laboratories in the 1940s under Peter Goldmark, the system was first publicly demonstrated on August 29, 1940, and received FCC approval as the U.S. color television standard on October 11, 1950.^[1] In its classic form, a monochrome camera captures luminance, while color information is encoded sequentially; at the receiver, a rotating color wheel with red, green, and blue filters—spinning at 1440 RPM to match 144 fields per second—synchronizes with the signal from a single electron gun to filter the black-and-white image into colors.^[3]^[2] The CBS system offered high color fidelity and simplicity in hardware but suffered from incompatibility with existing black-and-white televisions, mechanical complexity in the color wheel, and potential flicker or color fringing due to the sequential nature.^[1]^[2] Despite initial adoption, it was abandoned in favor of the compatible NTSC dot-sequential standard by 1953, limiting its commercial broadcast use.^[1] In modern applications, field-sequential techniques have been revived using electronic methods, such as liquid crystal displays (LCDs) with fast-switching "pi cells" to cycle colors without mechanical parts, enabling higher resolution, better color saturation, and flexible geometries for computer monitors and instrumentation.^[4] These advancements address historical drawbacks, making FSC suitable for niche high-definition displays where shadow-mask limitations are undesirable.^[4]

Principles of Operation

Basic Concept

A field-sequential color system is a method for capturing, transmitting, or displaying color images by sequentially presenting the primary color components—red, green, and blue (RGB)—in successive fields or frames, with the human visual system's persistence of vision integrating these into a perceived full-color image.^[2] This approach leverages a single monochrome signal with color information encoded sequentially at the source—either via a color wheel or filter in front of a single camera, or more commonly in broadcast systems by electronic multiplexing of signals from three separate monochrome cameras (one per primary color)—and decoded at the receiver using a synchronized color wheel or electronic switching, alternating full-luminance fields for each primary color rather than combining them spatially or simultaneously within each frame.^[2] In contrast to simultaneous color systems, such as NTSC or direct RGB transmission, which encode and deliver all color information concurrently—often via subcarriers or separate channels—field-sequential systems transmit one color at a time, potentially reducing overall bandwidth requirements compared to sending three independent full-bandwidth monochrome signals for each primary color.^[2] However, to prevent visible flicker or color breakup artifacts, these systems necessitate a significantly higher field rate, as the eye must blend the rapid succession without perceiving discrete color flashes.^[2] The concept emerged in the 1920s and 1940s as an early solution for color television amid limited electronic capabilities, with initial demonstrations using mechanical scanning to sequence colors before more refined electronic implementations.^[5] A foundational example was John Logie Baird's 1928 public demonstration of a mechanically scanned color system employing sequential filtering.^[5] Fundamentally, the field rate in such systems is triple the nominal frame rate to cycle through the three primaries per frame; for instance, a progressive 30 frames-per-second video (as in a hypothetical compatible system) requires 180 fields per second to maintain smooth integration without noticeable breakup, though historical systems like CBS used 144 fields per second for effectively 24 complete color frames per second (accounting for interlacing).^[2]^[3] This relationship can be expressed as:

\text{Field rate} = 3 \times \text{Frame rate}

Technical Advantages and Limitations

Field-sequential color systems encode color information by transmitting successive fields of red, green, and blue luminance signals, obtained either from a single monochrome camera using a rotating color wheel or sequential filter to isolate each primary color component during scanning, or more commonly in broadcast applications from three separate monochrome cameras (one per color) with electronic switching to multiplex the signals sequentially.^[6]^[2] At the receiver, decoding occurs through a synchronized color wheel or electronic switching mechanism that applies the appropriate color filter to a monochrome display tube for each field, reconstructing the full-color image via temporal integration.^[6] The human visual system's persistence of vision enables the integration of these sequential color fields into a perceived full-color image when the duration per field is shorter than approximately 50-60 ms, equivalent to field rates exceeding 16-20 Hz; however, this threshold is insufficient for flicker-free viewing, necessitating higher rates of 144-180 Hz to minimize brightness fluctuations and ensure smooth perception.^[7] In practice, motion within the scene can disrupt this integration, leading to visible color breakup artifacts where distinct color bands trail moving objects, often described as "rainbow" effects.^[8] A primary technical advantage of field-sequential systems lies in their provision of full luminance resolution for each color channel, as every field dedicates the entire spatial resolution to a single primary color, avoiding the subsampling of chrominance signals common in simultaneous color systems.^[2] This approach also reduces overall bandwidth demands relative to simultaneous methods, since no auxiliary color subcarrier is required for modulation, thereby eliminating associated crosstalk and phase errors while fitting within standard monochrome video bandwidths of around 4-4.5 MHz.^[9] Certain designs further enhance compatibility by allowing monochrome receivers to interpret the sequential luminance fields as grayscale images, albeit with potential adapters needed for synchronization in non-standard field rates.^[10] Despite these benefits, field-sequential systems are prone to flicker susceptibility, demanding elevated field rates of 144-180 Hz for acceptable viewing, which increases scanning complexity and power consumption compared to 60 Hz monochrome standards. Motion-induced color breakup remains a persistent limitation, as rapid eye or object movement prevents proper temporal averaging, producing distracting chromatic trails that degrade image quality.^[11] Additionally, achieving synchronization between transmitter and receiver often requires specialized adapters for standard monochrome sets, limiting backward compatibility without modifications, while early mechanical implementations introduced higher complexity through rotating color wheels prone to wear and alignment issues.^[10]

Historical Development

Early Mechanical Predecessors

The development of field-sequential color television began with mechanical scanning systems in the late 1920s, which used rotating discs to sequentially capture and display color components, relying on the persistence of vision to merge them into a full-color image. These early inventions demonstrated the feasibility of transmitting color information field by field but were constrained by the era's technology. John Logie Baird's 1928 demonstration marked the first functional color television system, employing a Nipkow disc scanner with red, green, and blue filters to sequentially transmit color images of simple objects like scarves and a policeman's helmet over short distances in his London laboratory.^[12]^[13] This three-color approach built on Baird's prior monochrome mechanical television work, using the disc's spiral perforations to scan the scene line by line while filters switched to isolate primary colors.^[14] Baird refined the system in the 1930s, improving resolution and enabling transmissions over greater distances, though still limited to low-speed, close-range demonstrations.^[15] Concurrent experiments at Bell Laboratories in the mid-1920s explored mechanical color television through sequential filtering, with engineer Herbert E. Ives developing systems that used photocells equipped with color filters to capture red, green, and blue components separately before transmission.^[16] These efforts culminated in a 1929 demonstration transmitting 50-line color images over telephone lines from New York to Washington, D.C., employing mirrors and filtered lights at the receiver to reconstruct the sequential fields into a viewable picture.^[17]^[18] In 1939, Hungarian inventor Kálmán Tihanyi's radiovision concepts further advanced ideas for sequential color handling in early television patents, describing charge-storage tubes adaptable for color transmission that influenced subsequent mechanical-to-electronic transitions.^[19] These mechanical predecessors faced significant technical hurdles, including low resolution of 30 to 120 lines per frame, which resulted in coarse, flickering images unsuitable for practical viewing.^[20] Precise synchronization of rotating discs between transmitter and receiver was essential but challenging, as any misalignment caused severe image distortion, and the systems' mechanical components were prone to wear and fragility, restricting use to controlled studio environments.^[21] Despite these limitations, the mechanical field-sequential approach validated the core principle of time-multiplexed color transmission and informed later electronic systems that overcame mechanical constraints by the 1940s.^[22]

Goldmark-CBS Electronic System

The Goldmark-CBS electronic system, developed by engineer Peter Goldmark at CBS Laboratories, represented a significant advancement in electronic color television during the 1940s. First publicly demonstrated on August 29, 1940, at the New York World's Fair grounds, the system introduced a practical method for broadcasting color images using electronic scanning, building on earlier mechanical concepts but emphasizing compatibility with monochrome infrastructure where possible. Goldmark's innovation addressed flicker issues inherent in sequential color transmission by increasing the field rate, resulting in a 405-line resolution signal transmitted at 144 fields per second—equivalent to 144 monochrome fields per second or 24 full-color frames per second.^[23]^[1] At the transmitter, the system employed a single monochrome iconoscope or image orthicon camera fitted with a rotating color disk positioned in front of the lens to sequentially filter incoming light into red, green, and blue components. The color disk featured six alternating filter segments—two each for red, green, and blue—spinning at 1,440 revolutions per minute (24 revolutions per second) to synchronize with the 144-field rate, ensuring each field captured a complete monochrome image in one primary color. This mechanical-optical encoding produced a composite video signal that could be broadcast over standard VHF channels, though the higher field rate and reduced line count distinguished it from prevailing black-and-white standards.^[3]^[24] Receivers required a matching color disk in front of the kinescope, driven by a synchronous motor to replicate the transmitter's sequencing and reconstruct the full-color image through the persistence of vision. Synchronization between transmitter and receiver was achieved via a dedicated pilot tone embedded in the video signal, which controlled the phase and speed of the receiver's disk motor, preventing color fringing or misalignment. The system's design prioritized simplicity in electronics, relying on the mechanical disk for color separation rather than complex simultaneous RGB processing.^[1]^[2] In October 1950, the Federal Communications Commission (FCC) approved the Goldmark-CBS system as the national color television standard, citing its superior image quality and technical maturity over competing proposals. However, the approval mandated new receiver designs capable of handling the 405-line format and 144-field rate, rendering it incompatible with the approximately 5 million existing 525-line monochrome television sets in American homes at the time. This incompatibility stemmed from the need to accommodate the tripled field rate within a constrained bandwidth of about 4 MHz for the video signal, which suppressed horizontal resolution during vertical flyback intervals to mask color disk transitions and maintain smooth playback. Vertical resolution per color field reached 405 lines, providing clear detail comparable to high-quality monochrome broadcasts of the era.^[25]^[1]

Guillermo González Camarena's Trichromatic System

Guillermo González Camarena, a Mexican electrical engineer, independently developed a field-sequential color television system in the late 1930s, distinct from contemporary efforts in the United States. At the age of 22, he filed for a patent in Mexico in September 1939 for his "Trichromatic Sequential Field System," which was granted in December 1940. This invention utilized electronic scanning to transmit color information sequentially in red, green, and blue fields, adapting existing black-and-white television equipment for color reproduction. A corresponding U.S. patent, No. 2,296,019, was granted on September 15, 1942, for the "Chromoscopic Adapter for Television Equipment," affirming the system's novelty and adaptability.^[26]^[27] The technical design of Camarena's system centered on a single camera tube, such as an iconoscope, paired with a rotating filter wheel to achieve color separation. The wheel, divided into three equal sectors with red, green, and blue filters, spun at 10 revolutions per second in front of the camera lens, capturing one color field per rotation to produce 30 color fields per second, equivalent to 10 full-color frames per second. This sequential filtering allowed the transmission of monochromatic signals for each primary color in rapid succession, synchronized via amplified pulses from the television system's frame rate, enabling viewers to perceive full-color images through retinal persistence. At the receiver end, a matching rotating filter wheel in front of a black-and-white cathode-ray tube decoded the signals, reconstructing the colored picture without requiring entirely new hardware. The system operated compatibly with early television standards, though specific resolution details from initial implementations are not extensively documented in primary sources.^[27]^[26] Camarena demonstrated the practical viability of his invention with the world's first field-sequential color television broadcast on August 31, 1946, from his laboratory in Mexico City at the Mexican League of Radio Experiments. This experimental transmission marked a milestone in non-U.S. color television development, showcasing live color images to a small audience. Building on this success, Camarena founded the experimental station XEGC in 1946, the precursor to Channel 5 (XHGC-TDT), which began regular broadcasting in 1952. Commercial color service expanded significantly in 1963, with the first official color broadcast on January 21 of that year featuring the program "Paraíso Infantil" on Channel 5, laying the groundwork for nationwide adoption in preparation for major events like the 1968 Mexico City Olympics, where his technology supported extensive color coverage.^[28]^[29]^[30] Camarena's trichromatic system continued to operate in Mexico through the 1960s and into the early 1970s, even as the NTSC standard gained global prominence. Despite the eventual shift to NTSC-compatible color broadcasting in Latin America, his innovations facilitated early and affordable color adoption in the region, promoting technical self-sufficiency and influencing subsequent television infrastructure in countries like Mexico, where his Channel 5 remained a key broadcaster. The system's emphasis on mechanical simplicity and compatibility with monochrome sets underscored its role in bridging the gap to widespread color television, leaving a lasting impact on broadcasting practices south of the U.S. border.^[28]^[31]^[26]

Applications in Broadcasting and Space

Commercial Broadcasting Attempts

In 1951, CBS initiated the commercial rollout of its field-sequential color television system, shipping about 200 receiver sets and selling roughly 100 at prices exceeding $1,000 each, despite the high cost limiting widespread adoption. Programming was constrained to approximately 7 hours per week across a small network of East Coast affiliates, which failed to generate sufficient viewer interest or content momentum. The Federal Communications Commission's approval of the CBS standard in 1950, while mandating color capability for broadcasters, created market uncertainty that depressed overall television sales, as consumers hesitated to purchase monochrome sets fearing obsolescence, though it indirectly sustained monochrome production during the Korean War-era restrictions on color manufacturing.^[32]^[33]^[34] The system's key commercial failures stemmed from its fundamental incompatibility with the established 525-line monochrome standard, as CBS employed a 405-line format that rendered existing black-and-white receivers useless without costly adapters, which manufacturers like RCA refused to produce. Mechanical components, particularly the expensive rotating color wheels required for sequential filtering, were prone to breakdowns and maintenance issues, exacerbating reliability concerns for early adopters. Viewers frequently complained about noticeable flicker from the 144-field-per-second rate—intended to mitigate but not eliminate visual artifacts—and the limited screen sizes of about 12 inches, which diminished the appeal compared to larger monochrome alternatives.^[32]^[9]^[1] Regulatory pressures ultimately doomed the initiative; amid lobbying from RCA and other stakeholders favoring a compatible system, the FCC reversed course and approved the NTSC color standard in December 1953, prioritizing backward compatibility with monochrome sets. CBS ceased field-sequential broadcasts in October 1951 and withdrew the system as the standard in 1953, pivoting to monochrome receivers to remain competitive in a market now aligned with the new standard.^[35]^[9] Internationally, field-sequential systems faced similar barriers to mainstream broadcasting. In the United Kingdom, John Logie Baird's mechanical field-sequential trials in the 1930s achieved experimental success but saw limited adoption due to incompatibility with the 405-line monochrome standard established for public service broadcasting. In Mexico, Guillermo González Camarena's independent trichromatic field-sequential system supported color transmissions in the early 1950s, gaining modest traction until the government adopted the compatible NTSC standard in 1963, effectively ending its viability.^[26]^[31]

Westinghouse Lunar Color Camera

Westinghouse Electric Corporation adapted its slow-scan monochrome television camera for the Apollo program to create a field-sequential color system suitable for space transmission. Originally developed for black-and-white imaging during the Apollo 11 lunar landing in 1969, the design was modified to incorporate sequential color filtering, selected over NTSC standards to deliver higher effective resolution within the stringent bandwidth and power constraints of lunar missions. This adaptation leveraged a single image tube with a mechanical color wheel, enabling compact, low-power operation in the vacuum and extreme temperatures of space.^[36]^[37] The Westinghouse Lunar Color Camera operated in a slow-scan mode at 10 frames per second, using a spinning internal color wheel with red, green, and blue filters rotating at approximately 600 rpm to capture sequential color fields from a single sensor. This produced an effective resolution of 320 lines (equivalent to a 320x240 pixel grid), far surpassing what an NTSC color signal could achieve under similar bandwidth limits of 500 kHz for early lunar surface transmissions, later expanded to 3 MHz in command module operations. The lightweight unit, weighing under 7 pounds and consuming about 6 watts, included automatic light control and low-light sensitivity via a secondary electron conduction (SEC) vidicon tube, with the overall signal transmitted over the unified S-band system supporting up to 30 MHz carrier bandwidth.^[36]^[37]^[38] At receiving stations, the field-sequential RGB signal underwent ground-based processing to convert it into NTSC-compatible video: demultiplexing separated the color fields, followed by matrixing the RGB components into YIQ color space for standard broadcast. This conversion, performed at Mission Control in Houston using specialized equipment like video tape recorders and scan converters, introduced a brief delay but ensured real-time color viewing for global audiences despite the non-standard format. The field-sequential approach proved advantageous for bandwidth efficiency, avoiding the resolution loss from NTSC's color subcarrier.^[36]^[39] The camera first delivered color lunar images from Apollo 11's command module in July 1969, marking the initial transmission of sequential color from deep space. It was deployed on the lunar surface beginning with Apollo 12, though the unit overheated and failed shortly after activation due to unintended solar exposure; subsequent missions from Apollo 14 through 17 featured upgrades, including enhanced low-light performance and protective modifications like automatic lens caps, enabling extended EVAs and clearer imagery of lunar activities.^[39]^[36]

Modern and Specialized Uses

Projection Display Technologies

Field-sequential color systems have found significant application in projection display technologies, particularly through Texas Instruments' Digital Light Processing (DLP) architecture, which employs a single-chip digital micromirror device (DMD) illuminated sequentially by red, green, and blue light via a spinning color wheel.^[40] This approach, introduced in the 1990s, synchronizes the DMD's micromirror tilting—up to thousands of times per second—with the color wheel's rotation, typically at 120 to 240 Hz, to project full-color images by exploiting the persistence of vision.^[40] The result is compact, high-brightness projectors suitable for portable and home theater use, with optical engines scaling from 20-30 lumens in pico projectors to over 50,000 lumens in cinema systems.^[40] A notable artifact in traditional single-chip DLP projectors is the "rainbow effect," where rapid color sequencing causes brief flashes of red, green, or blue in high-contrast or moving scenes, perceptible to a small percentage of viewers due to individual retinal sensitivities.^[41] This occurs primarily in lamp-based or early laser-phosphor systems with slower color cycling.^[41] Mitigation strategies in newer models include dual color wheels with optimized six- to eight-segment layouts for faster switching, as well as LED or RGB laser illumination that enables up to six times quicker color sequencing without a mechanical wheel, effectively eliminating the effect in many designs.^[41] Earlier projection systems like the Eidophor oil-film projector, developed in Switzerland during the 1940s and commercialized from 1958, also utilized field-sequential principles for large-venue displays, employing synchronously rotating color filter discs to produce red, green, and blue fields from a high-intensity xenon lamp.^[42] Adapted for CBS's field-sequential color television in the 1950s, these projectors achieved brightness levels of 500 lumens in early color models, supporting theater-sized images up to 20 feet wide for applications in cinemas and simulators until production ended in the late 1980s.^[42] Approximately 600 units were deployed worldwide by 1989, valued for their ability to handle analog video signals in pre-digital eras.^[42] In contemporary home theater setups, LED-based sequential projectors build on DLP technology by using arrays of red, green, and blue LEDs to illuminate the DMD directly, bypassing the color wheel for reduced mechanical complexity and instant on/off operation.^[43] These systems maintain field-sequential delivery but benefit from LED longevity exceeding 20,000 hours and lower power draw, making them ideal for portable and fixed installations.^[43] DLP projection technologies remain cost-effective for achieving 1080p and higher resolutions, with single-chip designs offering high native contrast ratios over 2,000:1 and support for wide color gamuts—up to 110% Rec. 709—through phosphor-enhanced wheels in laser systems.^[43] This has secured substantial market dominance in portable projectors, capturing over 65% share as of 2024 due to their compact form, reliability, and versatility in education, entertainment, and business environments.^[44]

Augmented and Virtual Reality Displays

Field-sequential color (FSC) systems have become prominent in augmented reality (AR) and virtual reality (VR) headsets, particularly for near-eye displays requiring compact form factors and high resolutions. In these applications, FSC enables the use of a single monochrome panel that sequentially illuminates with red, green, and blue light sources, such as LEDs, to produce full-color images without spatial color filters. This approach is especially suited to liquid crystal on silicon (LCOS) and digital light processing (DLP) technologies, which have been integrated into AR devices since the 2010s to achieve resolutions like 1080p per eye in smaller packages.^[45]^[46] A key example is the Microsoft HoloLens, which employs dual Himax-manufactured FSC LCOS microdisplays to deliver immersive AR experiences through waveguide optics. The sequential color timing with RGB LEDs allows for efficient light utilization in a head-mounted form factor, supporting 60 Hz color field rates for smooth visuals. Similarly, DLP-based systems, such as those from Texas Instruments' Pico technology, use micromirror arrays to reflect sequential color fields, providing high brightness and contrast in AR glasses like those developed by DigiLens. These implementations prioritize smaller pixel pitches—often below 5 µm—by avoiding the need for separate subpixels per color, making them ideal for waveguide-based AR where space and weight are critical.^[47]^[48]^[49] The primary advantages of FSC in wearables stem from its ability to reduce the effective pixel count by approximately a factor of three compared to spatial color systems, as a single grayscale panel handles all colors temporally, which lowers power consumption and enables higher resolutions in constrained designs. This efficiency is particularly beneficial for battery-powered AR glasses, where it minimizes heat generation and extends runtime, and has been applied in waveguide architectures to overlay virtual content on real-world views with minimal optical overhead. However, FSC introduces challenges like motion-induced color breakup, often perceived as fringing or a "rainbow effect," due to the eye's movement across sequential color fields. These artifacts are mitigated by increasing refresh rates to 120–240 Hz, leveraging the fast response times of LCOS panels to minimize visible flicker and breakup; for instance, Kopin Corporation's LCOS displays, used in military AR systems, incorporate such high-frame-rate operation for reliable performance in dynamic environments.^[49]^[50]^[51] Emerging trends in FSC for AR/VR include hybrid integrations with OLED technologies, such as OLED-on-silicon (OLEDoS) combined with sequential backlighting from mini-LEDs, to enhance color gamut and brightness while retaining the compactness of FSC. These developments aim to support 4K+ resolutions in future smart glasses, potentially revolutionizing lightweight VR headsets by balancing efficiency with immersive quality, as explored in recent advancements in tandem OLED architectures and field-sequential driving algorithms. In 2025, advancements include FSC LCDs for VR achieving 60 pixels per degree (PPD) and 100° FoV, and front-lit LCOS (FLCoS) microdisplays for AR with enhanced efficiency and sub-5 µm pixels.^[52]^[53]^[54]^[55]

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Mar 1, 2018 · The optical system sequentially provides red, green, and blue light to the LCOS panel.
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Augmented Reality and Virtual Reality Displays - PubMed Central
Jul 22, 2020 · Similar to LCoS, DLP panels are field-sequential micromirror displays with high brightness (Thompson et al., 2015), as employed by DigiLens.
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[PDF] Holographic Near-Eye Displays for Virtual and Augmented Reality
For full color operation, the displays operated in a color field sequential operation at a 20 Hz frame rate (60 Hz color field rate), limited by the refresh ...
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[PDF] TI DLP® Pico™ Technology for AR Glasses
TI DLP® Pico technology enables small, high-performance, low-power AR display modules with high optical efficiency, contrast, and speed.
[50]
Augmented reality and virtual reality displays: emerging ... - Nature
Oct 25, 2021 · Without the need for an alignment process, the pixel size can be reduced to <5 µm. ... color image is mainly obtained through color-sequential ...Missing: count | Show results with:count
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Analyzing Optics' Pivotal Role in Augmented and Mixed Reality ...
Mar 20, 2023 · LCoS. Field-sequential color LCoS is the dominant display technology in waveguide designs. Companies with older designs using Texas Instruments ...Diffraction-Grating... · Display Devices For Ar And... · Laser Beam Scanning
[52]
Kopin Displays and Near Eye (Followup to Seeking Alpha Article)
Mar 25, 2013 · The down side to field sequential color is the color field breakup where when the display move quickly relative to the eye, the colors may not ...
[53]
Advances and challenges in microdisplays and imaging optics for ...
Jun 21, 2024 · Advanced display architectures such as microcavity tandem OLEDs and novel driving algorithms of mini-LED backlit field-sequential-color (FSC) ...
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Advanced liquid crystal devices for augmented reality and virtual ...
May 30, 2022 · In this paper, we focus on advanced LC-based light engines and optical components for AR/VR applications.