Use of wire grid polarizers with liquid crystal display for large-volume stereolithography

Rodriguez, Nicholas; Song, Haiyan; Chen, Morgan; Oakdale, James S.; Duoss, Eric B.; Seepersad, Carolyn Conner; Crawford, Richard H.

doi:10.1016/j.addma.2022.102641

Cited by 8 publications

(9 citation statements)

References 20 publications

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“…In most cases, stretched sheet polyvinyl alcohol (PVA) has been used for film polarizers which absorb the reflected light, resulting in overheating at lower light intensity. Due to this problem, a wire grid polarizer has been used to increase the monochrome LCD output intensity by more than 50 mW/cm 2 [ 90 ]. This system helps to cure the low-sensitive material like PCHS-silicones.…”

Section: Challenges With High-speed Vpp Image Projection Systemsmentioning

confidence: 99%

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A Review of Critical Issues in High-Speed Vat Photopolymerization

et al. 2023

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Vat photopolymerization (VPP) is an effective additive manufacturing (AM) process known for its high dimensional accuracy and excellent surface finish. It employs vector scanning and mask projection techniques to cure photopolymer resin at a specific wavelength. Among the mask projection methods, digital light processing (DLP) and liquid crystal display (LCD) VPP have gained significant popularity in various industries. To upgrade DLP and LCC VPP into a high-speed process, increasing both the printing speed and projection area in terms of the volumetric print rate is crucial. However, challenges arise, such as the high separation force between the cured part and the interface and a longer resin refilling time. Additionally, the divergence of the light-emitting diode (LED) makes controlling the irradiance homogeneity of large-sized LCD panels difficult, while low transmission rates of near ultraviolet (NUV) impact the processing time of LCD VPP. Furthermore, limitations in light intensity and fixed pixel ratios of digital micromirror devices (DMDs) constrain the increase in the projection area of DLP VPP. This paper identifies these critical issues and provides detailed reviews of available solutions, aiming to guide future research towards developing a more productive and cost-effective high-speed VPP in terms of the high volumetric print rate.

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Section: Challenges With High-speed Vpp Image Projection Systemsmentioning

confidence: 99%

“…( b ) Diagram of the unpolarized light of LED array passes through components in LCD VPP. Reproduced with permission from [ 90 ]. ( c ) Schematic arrangement of the LED’s primary and secondary optics in standard LCD VPP.…”

Section: Challenges With High-speed Vpp Image Projection Systemsmentioning

confidence: 99%

A Review of Critical Issues in High-Speed Vat Photopolymerization

et al. 2023

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“…LCDs stand out due to the reliability and costeffectiveness 1,2,3,4 . Normally, color filters are essential for LCD to produce RGB images, but the residual color filter reduces the light transmission efficiency seriously 5,6 . Compared with LCDs with color filters, the field-sequential-color liquid crystal display (FSC LCD) is a promising candidate for next-generation LCD technology since no color filters are required in this structure 7 .…”

Section: Introductionmentioning

confidence: 99%

12‐1: High‐resolution Fast Ferroelectric Liquid Crystal Displays on Gen 4.5

YUAN,

ZHAO,

PAN

et al. 2024

Symp Digest of Tech Papers

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A successful test of Ferroelectric Liquid Crystal Displays (FLCD) on Gen 4.5 is realized in this paper. A new polyimide (PI) that can replace Nylon 6 (N6) is synthesized and tested on the production line. This used to be the barrier in the commercialization of FLCD. Apart from that, a new FLC for mass production is synthesized. To investigate the surface energy and relative performance, various materials are compared. This proof of the feasibility on the production line is a significant step towards the commercialization of field‐sequential‐color high‐resolution FLCDs.

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“…As shown in Table S1, high-end printers or custom systems can project the grayscale mask pattern directly, while more commonly used projection SLA printers can only handle 1-bit slices. 9,10,[24][25][26][27][28][29][30][31] Some custom setups [32][33][34][35][36] and modified commercial printers (Table S1; Note S1) provide spatial control over the exposure time to realize FGMs. However, this dynamic digital exposure method fails to be used extensively in commercial setups due to the difficulties of line-by-line G-code modification (i.e., to assign different exposure times for different regions in the same layer) 37 and its step-and-exposure process.…”

Section: Introductionmentioning

confidence: 99%