11.1: Polyimide Films Designed to Produce High Pretilt Angles with a Single Linearly Polarized UV Exposure

Nishikawa, Michinori; Taheri, Bahman; West, John L.

doi:10.1889/1.1833711

Cited by 29 publications

(18 citation statements)

References 12 publications

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“…[1][2][3][4][5][6] The motivation for this is the well documented drawbacks associated with the current technology of rubbed polyimide 7,8) used by the liquid crystal display (LCD) industry. Also, high resolution, wide viewing angle displays [9][10][11][12] require small pixel sizes and controlled director configurations in multi-domain pixels.…”

Section: Introductionmentioning

confidence: 99%

Photo-Dimerized Monolayer (PDML) versus Rubbed Polyimide (RPI): A Comparison of Electro-Optic Properties

Shenoy

Grueneberg

Naciri

et al. 1998

Jpn. J. Appl. Phys.

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Electro-Optic response characteristics as well as polar anchoring energies of liquid crystal cells prepared using a new photoalignment technique i.e., photo-dimerized monolayer, have been measured. These data are compared with those for cells that use a rubbed polyimide alignment layer. The two alignment methods yield comparable electro-optic properties showing thereby that the new photo-alignment technique is a viable alternative to the rubbed alignment technique for display applications.

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Section: Introductionmentioning

confidence: 99%

Photo-Dimerized Monolayer (PDML) versus Rubbed Polyimide (RPI): A Comparison of Electro-Optic Properties

Shenoy

Grueneberg

Naciri

et al. 1998

Jpn. J. Appl. Phys.

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“…The direction of LC orientation is known to be an important factor for the generation of the pretilt angle [12]. Therefore, we checked the pretilt angle of the LC on the two blend alignment layers of PMA-g-coumarin and polyimide.…”

Section: Pretilt Angle Measurementmentioning

confidence: 99%

Effect of photoreactivity of polyimide on the molecular orientation of liquid crystals on photoreactive polymer/polyimide blends

et al. 2004

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We prepared blend alignment layers from polymethacrylate with coumarin side chains (PMA-g-coumarin) and polyimides for the orientation of liquid crystals (LCs) using linearly polarized ultraviolet (UV) irradiation. We used two different polyimides, namely 4,4'-(hexafluoro-isopropylidene) diphthalic anhydride-3,5-diamino-benzoic acid (6FDA-DBA) and pyromellitic dianhydride-4,4'-oxydianiline (PMDA-ODA). It was found that the molecular orientation of the LC depended on the type of polyimide in the blend alignment layer. The thermal stability of the LC orientation was enhanced regardless of the type of polyimide, while the direction of LC orientation was different for each type of polyimide. The photoreactivity of the polyimide was a very important factor in determining the molecular orientation of the LC on the blend alignment layer. This may be attributed to the different mechanisms of LC orientation on PMA-g-coumarin and polyimide induced by the polarized UV irradiation. The direction of the LC orientation could be changed by controlling the photoreaction of the polyimides using the appropriate UV filter for the polarized UV irradiation.

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“…LC cells with a high pretilt angle exhibit a singular capability, such as a fast response characteristic or a bistable function with low power consumption . Several methods for inducing the high pretilt angle have been proposed . For example, Yeung et al .…”

Section: Introductionmentioning

confidence: 99%

Control of the pretilt angle for liquid crystal alignment using novel electrospray deposition methods with two capillaries

2014

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The electrospray deposition (ESD) method is an established film‐forming technique. To control the pretilt angle on films, we developed two novel ESD methods for spraying two kinds of solutions containing alignment materials. One method is a simultaneous spraying method, while the other is a time‐divided spraying method. When we used the simultaneous‐spraying ESD method, we observed numerous fine liquid crystal (LC) domains with a diameter of approximately 10 µm in the LC cell. These LC domains were substantially smaller than those of LCs fabricated using the conventional ESD method. However, the pretilt angle could not be controlled over a wide range because multiple parameters could not be simultaneously controlled to achieve a stable spray. Using the time‐division ESD method, we controlled the pretilt angle over a wide range from 5° to 40°, with tiny domains. As a demonstration, we fabricated a 270° super‐twisted nematic mode cell using this method.

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11.1: Polyimide Films Designed to Produce High Pretilt Angles with a Single Linearly Polarized UV Exposure

Cited by 29 publications

References 12 publications

Photo-Dimerized Monolayer (PDML) versus Rubbed Polyimide (RPI): A Comparison of Electro-Optic Properties

Photo-Dimerized Monolayer (PDML) versus Rubbed Polyimide (RPI): A Comparison of Electro-Optic Properties

Effect of photoreactivity of polyimide on the molecular orientation of liquid crystals on photoreactive polymer/polyimide blends

Control of the pretilt angle for liquid crystal alignment using novel electrospray deposition methods with two capillaries

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