15.1: Optically Rewritable LiquidCrystal Technology: A New Green EPaper Approach

Chigrinov, Vladimir G.; Murauski, Anatoli; Yu, Qiang; Kwok, Hoi Sing

doi:10.1889/1.3500403

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…The micron-sized pattern of LC alignment is difficult to achieve by rubbing but easy to achieve by photoaligning. Surface-mediated photoalignment is also effective for the fabrication of flexible and rewritable displays [31], gradientindex lenses [32], and other devices [33].…”

Section: Photo-isomerization In Azo-compound-containing Polymer/dye Fmentioning

confidence: 99%

Photo-Alignment Technology

Lin

2014

Topics in Applied Physics

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LCDs are used in many everyday devices, including mobile phones, notebook computers and wide screen televisions. A typical LCD is composed of two glass substrates between which is a gap that is filled with LC. The arrangement of the LC is controlled by the boundary condition of an alignment film. A long-range orientational interaction causes the preferable alignment of a LC by the surface boundary to extend into the LC bulk. The alignment layer is typically rubbed with a special cloth to induce a unidirectional alignment of the LC. In the first devices based on twisted LCs, these LCs were aligned only by rubbing transparent electrodes. The rubbing technique became much more reliable when the glass substrate was covered with a rubbed polymer layer. The rubbing of polymers is a very simple technique and it is now extensively utilized in both small scientific laboratories and large LCD factories.Despite the extensive use of rubbing in LCD manufacturing, it has some serious shortcomings that arise from the contact involved in rubbing. These critically affect the production of the most recent generation of LCDs and miniature LC photonic devices. First, rotational rubbing for the polymer surface causes the accumulation of static charges and the formation of fine dust particles. The accumulation of static electricity may destroy the transistors or diodes in the LCD. The second shortcoming is the effect of decreasing in manufacturing yield. Rubbing for large and high-resolution active matrix LCDs (AMLCDs) involve additional difficulties that are associated with the precise control of the rubbing characteristics. Other problems are the difficulty of producing local structures with the required LC director alignment in the selected areas of the device. Finally, this method cannot be used to align LCs in closed volumes.For all of the above reasons, new alignment solutions and approaches are sought. There are some alternative methods of rubbing include laser writing, micro-rubbing, ion beam irradiation and photoalignment. Of these methods, the

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Section: Photo-isomerization In Azo-compound-containing Polymer/dye Fmentioning

confidence: 99%

Photo-Alignment Technology

Lin

2014

Topics in Applied Physics

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“…Such tunable birefringent q-plates based on electrical field controlled LC cell with special alignment (Fig.4) can found numerous applications in various fields of optics and displays. Recent developments of optical rewritable (ORW) LC photoaligning display and progress in LC photoalignment have made it possible to separate e-paper display-unit and driving optoelectronics part ( Fig.5) [6]. It has no electrodes, possesses grey scale capability, truly stable, and no power consumption of showing the image with wide viewing angles and high contrast.…”

Section: Figure 3 Photo-patterned Micropolarizer Array For a Simultamentioning

confidence: 99%

63.1: Invited Paper: Liquid Crystal Devices Based on Photo‐Alignment and Photo‐Patterning Materials

Chigrinov

Kwok

Nishiyama³

et al. 2011

Symp Digest of Tech Papers

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Liquid crystal devices based on photo-alignment and photo-patterning materials, were proposed, including patterned retarders for 3D applications, lenses with electrically tunable focal distance, LC based sensors, switchable q-plates, and optically rewritable E-paper. The photoalignment materials were mostly photosensitive azodye layers. The combination of azo-dye layers and liquid crystal polymers were also used for photo patterned phase retarders. The practical applications of new LC elements in 3D displays and other LC technology areas are envisaged.

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“…So, we can obtain specified twist angle in the ORW LC cell and keep it with zero power consumption for a long time. ORW e‐paper is an optically addressed device, having no electrodes, possessing grayscale capability, being truly stable, and not requiring power to show the image with wide viewing angles and high contrast . During these days when we are in need of exploring the new source of energy and save the power consumption, it is extremely important to engineer low power‐consuming devices.…”

Section: Introductionmentioning

confidence: 99%

Autostereoscopic 3D pictures on optically rewritable electronic paper

Wang

Sun

et al. 2013

J Soc Info Display

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In this article, we disclose a method to fabricate the three-dimensional (3D) image on an optically rewritable (ORW) electronic paper (e-paper) by deploying the lenticular lenses array on the top of the ORW e-paper. Unlike other autostereoscopic 3D liquid crystal displays, our autostereoscopic 3D ORW e-paper is actually a green technology, which is without electrode and voltage. No electricity is needed to maintain the 3D image on the ORW e-paper. We can easily change a 3D image by erasing and rewriting with photoalignment technology.

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15.1: Optically Rewritable LiquidCrystal Technology: A New Green EPaper Approach

Cited by 4 publications

References 11 publications

Photo-Alignment Technology

Photo-Alignment Technology

63.1: Invited Paper: Liquid Crystal Devices Based on Photo‐Alignment and Photo‐Patterning Materials

Autostereoscopic 3D pictures on optically rewritable electronic paper

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