Fast-switching initially-transparent liquid crystal light shutter with crossed patterned electrodes

Heo, Joon; Huh, Jae Won; Yoon, Tae–Hoon

doi:10.1063/1.4918277

Cited by 78 publications

(32 citation statements)

References 20 publications

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“…On the other hand, light absorption can provide black color, but it cannot block the objects behind a display completely. Therefore, LC light shutters based on both light scattering and absorption have been proposed, such as dye-doped ChLC and dye-doped polymernetworked LC (PNLC) [9][10][11]. However, these light shutters exhibit a rather high transmittance in the opaque state because dichroic dye molecules are not aligned parallel to the substrate.…”

Section: Objective and Backgroundmentioning

confidence: 99%

P-142: Double-Layered Light Shutter using Polymer Dispersed Liquid Crystals and Dye-Doped Cholesteric Liquid Crystals

Beak

Heo

et al. 2016

SID Symposium Digest of Technical Papers

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Section: Objective and Backgroundmentioning

confidence: 99%

P-142: Double-Layered Light Shutter using Polymer Dispersed Liquid Crystals and Dye-Doped Cholesteric Liquid Crystals

Beak

Heo

et al. 2016

SID Symposium Digest of Technical Papers

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“…For practical application of the light shutter to a see-through display, simultaneous use of both light scattering and absorption effects is necessary in a single-layered structure. A light shutter using polymer-networked LCs with crossed patterned electrodes structure was proposed, [13] but its complicated structure may make its practical application difficult.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous control of haze and transmittance using a dye-doped cholesteric liquid crystal cell

Huh

Heo

et al. 2015

Liquid Crystals

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We propose a light shutter device using dye-doped cholesteric liquid crystals for a high-visibility see-through display. In the focal-conic state, the proposed device can perfectly block the background image through simultaneous use of light scattering and absorption effects in a single-layered structure. By switching the proposed device placed at the backside of a see-through display, we can choose transparent or high-visibility display modes in a see-through display.

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“…There have been proposals to introduce selectable light shutter layers, such as scattering polymer dispersed liquid crystal (PDLC) layers, absorbing electrochromic or dye‐doped polymer networked liquid crystal layers behind the transparent display. In one mode, both the light shutter layer and display may be turned off, allowing the background to be viewed (i.e., window mode).…”

Section: Introductionmentioning

confidence: 99%

A switched emissive transparent display with controllable per‐pixel opacity

Smithwick

2016

J Soc Info Display

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An emissive transparent display with per-pixel opacity employs rapid synchronized switching of a transparent display and transparent backlight between content with a scattering luminous backlight, and masks with a clear unlit backlight. A 144 fps transparent LCD panel is used in conjunction with a transparent backlight and controllably diffusive smartglass screen. The display is capable of producing opaque emissive content on a transparent field for novel display and compact spatial augmented reality applications.Author Keywords transparent display; opaque; emissive; switching; transparent backlight ObjectiveMany futuristic display concepts from action and sci-fi movies involve transparent displays with colorfully emissive yet opaque content; we have interest in physically creating such displays. Such a display would also be useful in allowing synthetic characters to be placed amongst physical objects a real-world scene, i.e. a compact Pepper's Ghost. In these cases, the ability to control opacity in a transparent display is important, otherwise the content or character would be also appear semi-transparent and low contrast against bright busy background environments.Practical implementation of such a display is difficult since each pixel of such a display would need not only a color, e.g. R: red, G: green, B:blue components, and emissive luminance/brightness, e.g. R,G,B= [0, 1, ... , 255], but also an absorption/opacity, e.g. α= [0,1, ..., 255]. This would be considered a color transparent emissive display with real-world optical alpha (or per-pixel variable transparency). Current displays' pixels control only two out of the three variables. For example, the pixels of a transparent LCD panel vary color and opacity, but not emissive luminance; LCD panels to not generate their own light. Similarly, transparent OLEDs may vary color and luminance, but do not control opacity; OLEDs do not modulate background light. As a result, content displayed on current transparent displays are low-contrast and semi-transparent. We need pixels that can vary in color, luminance and opacity (e.g.RGBα), and the display must be able to accept such four data component signals (or six data component with an independent alpha channel for each color channel). Typical video signals have only three data components (RGB).Since common displays are only able to control two out of the three desired variables of luminance, color and opacity, we temporally multiplex opaque-emissive content (color and luminance) and transparency with absorbing masks (color and transparency). We employ rapid synchronized switching of a transparent LCD display and transparent backlight between displayed content with scattering-luminous backlight, and displayed mask with a transparent -nonluminous backlight states. To implement this scheme, a 120 fps (or greater) transparent LCD panel can be used in conjunction with a variety of transparent backlights. BackgroundWe have previously presented displays which can control each pixel's color, luminance, and opacity...

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Fast-switching initially-transparent liquid crystal light shutter with crossed patterned electrodes

Cited by 78 publications

References 20 publications

P-142: Double-Layered Light Shutter using Polymer Dispersed Liquid Crystals and Dye-Doped Cholesteric Liquid Crystals

P-142: Double-Layered Light Shutter using Polymer Dispersed Liquid Crystals and Dye-Doped Cholesteric Liquid Crystals

Simultaneous control of haze and transmittance using a dye-doped cholesteric liquid crystal cell

A switched emissive transparent display with controllable per‐pixel opacity

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