Self-powered smart windows are desirable with the expectations of their energy-saving, weather-independent, user-controllable, and miniature performance. Recently developed solar- or thermal-powered largely depend on weather conditions have an extremely slow response, only a certain portion saved energy can be utilized by external circuit for mode conversion. In this work, self-powered normally transparent window was conjunction rotary freestanding sliding triboelectric nanogenerator...

Abstract Multi‐viewpoint retina projection displays (RPD) with an expanded visible range have been utilized in recent augmented reality (AR) systems to address the vergence‐accommodation conflict (VAC) by providing a long depth of field (DOF). However, these fixed multi‐viewpoint RPD still face common critical challenge imaging overlap or discontinuity when eyes rotate under varying ambient light. To this, AR system featuring switchable ultra‐dense viewpoints is presented, enabled...

We report a method of obtaining controllable spatially varying liquid crystal pretilt angles using stacked alignment layer. The layer consists nano-domains horizontal and vertical materials. angle is controlled by the domain ratio two layers. By photoalignment material as top layer, can be UV light dosage. A variable beam used to control spatially. An electrically tunable-focus lens obtained this method.

Passivation of photoalignment films by continuous layers reactive mesogen provides stable liquid crystal alignment and electro-optic performance equivalent to that rubbed polyimide films.

Smart windows which switch between transparent and scattering states can be used not only as privacy window in buildings cars, but also information displays, motorcycle helmet visors. Here, we have proposed a reverse mode polymer-stabilised liquid crystals (PSLCs) smart based on inhomogeneous alignment surface, greatly enhances the haze by 42% when compared to device without inhomogeneity treatment. A 100-cm2 that switches power-off clear state (~4% haze) power-on (64% at 15 V) less than 3.5...

We propose here a novel multi-layered waveguide liquid crystal (LC) smart window with full color rendering based on polymer-network system. The inserted position of three-primary-color LED light bars is specially designed, which parallel to the LC alignment obtain higher difference between transparent and scattering states. optimal matching system experimentally achieved by comparing several groups reactive mesogen materials. prepared measured analyzed in detail including optical/chromatic...

In this Letter, we report a method to prepare liquid crystal (LC) lens based on variable pretilt angle of photoalignment (PA) layer. With precise control the irradiance, such PA provides good that can be tuned in range 1°-89°. Therefore, irradiance generates spatially varying with any desired profile. Thus, tunable LC lenses have been fabricated and characterized. low voltage operations, easy fabrication, relatively high switching speed, applied many modern optical photonic devices.

Pancharatnam-Berry phase optical elements (PBOEs) have received much attention due to their ability generate complex structured light or manipulate the shape of a beam. This work demonstrates tunable liquid crystal (LC) (LCPB) lens using simple and cost-effective PB hologram setup thermal polymerization form an irreversible photo-patterning alignment layer. The LCPB with high photo-stability supports ultra-broadband operation provides diffraction efficiency ∼90% throughout visible spectral...

Abstract A simple projected capacitive touch panel is developed. This capable of detecting multi‐point events. The device consists a single piece patterned transparent ITO glass and sensing circuit. applied driving signal onto the node in form an electric field. charge circuit used to monitor mutual capacitance between nodes. approach provides low cost alternative current multi‐touch design.

As one of the diffractive optical elements, circular Dammann grating has shown its excellent versatility in practical applications. The electrically switchable been extensively investigated; however, research on optically tunable received less attention and reports this subject have insufficient past decade. In paper, three-order eight-order binary-phase liquid crystal gratings with two mutually orthogonal photo-induced alignments every adjacent alignment domains, fabricated by a...

A front polarizer-free optically rewritable (ORW) liquid crystal display (LCD) has been made via a hybrid alignment configuration with dye-doped LCs. The structure consists of one active planar and passive homeotropic layer. rewritability the device is achieved by photo-reorienting azo dye molecules in doped LCs to function as polarizer following LCs' direction guest-host effect so that can be eliminated. This makes more compact easier operate for image erasing rewriting. rewriting time only...

Bistable electrical switching of high-efficiency grating diffractions is realized by adding a front π-bistable twisted nematic (π-BTN) cell to passive liquid crystal polarization (LCPG). The π-BTN can be switched between stable non- and 180°-twisted states, acting as converter that switches the laser beam thus changes diffraction behavior LCPG. Both states are reversibly each other applying voltage pulse different frequencies. We experimentally demonstrate two bistable-switching operations:...

A novel azo dye stabilization method was presented that only requires single‐shot UV light exposure. The proposed photoalignment layer offers highly acceptable thermal and photo‐stability, as well low pre‐tilt angle (0.2°) image sticking (1.01). Also, high VHR (99%) RDC (<10mV) comparable to of PI rubbing have been achieved. Furthermore, the ability multi‐domain alignment has demonstrated shows a great potential in wide range electro‐optical devices.

Stable ferroelectric liquid crystal (FLC) elements have been realised by optically stabilised alignment film and thermally film. The two methods of fabricated FLC explored for different aspects, namely quality, electro-optical response their possibility complicate aligning patterns such as grating Pancharatnam–Berry lens. They are compared based on requirements applications. With these approaches, we able to produce various types photonic display devices with good photostability.

By recent progress in electrically suppressed helix (ESH) ferroelectric liquid crystal (FLC) mode, a novel pixel design employing pulse width modulated (PWM) grayscale scheme, focusing on TFT flat panel display applications is proposed. Such has 3T1C structure, which compact enough to preserve reasonable aperture practice. Incorporating an innovative driving the proposed architecture successfully demonstrates fully digital and compatible AMFLC architecture, possessing uniform continuous...

In this paper, a TFT based polarization-controllable light-printer for optically rewritable (ORW) liquid crystal displays (LCDs) is proposed. Experimental results with gray scale images are also presented. The consists o f vertically aligned nematic (VAN) mono-color LCD as polarization controlling unit. 420nm LED light source Fresnel lens forms the projection With two-dimensional unit, can transfer content to large-area ORW panel easily.

A photo‐stable azo dye photoalignment surface for liquid crystal is proposed and demonstrated. The alignment has a structure of stacking thin photo‐polymerisable polymer on top an layer. acts as passivation layer the direction cannot be rewritten once polymerized. Hence, synthetic robust, highly reproducible excellent stability. In addition, measurement results show properties this are comparable to conventional polyimide. As result, suitable in plane switching display which requires high...

Abstract A new kind of nano‐structured alignment surface is proposed and demonstrated. Such capable generating arbitrary pretilt angles for liquid crystal. The based on nano‐imprinting plasma etching. domain sizes are fixed controllable; in addition, no random process involved. robust highly reproducible. Moreover, the processing window maximized suitable mass manufacturing.

In this article, a photoalignment layer, based on the azo dye and liquid crystal polymer (LCP) composite is proposed. The alignment layer offers easy processing high photo thermal stabilities. VHR (99.1%) low RDC (30mV) have been achieved that comparable with conventional PI rubbing layer. proposed shows pre-tilt angle small image sticking which highly desirable for IPS display. Furthermore, ability of multi-domain has demonstrated great potential to find applications in range...

Photoalignment is one of the best candidates proven market for multi domain display. It allows nearly free pattern to liquid crystal alignment direction compared conventional rubbed polyimide. Most available photoalignment materials require polarized deep UV irradiation with a finite dosage. With consideration current limitation such small working window, vertical surface by non‐polarized LED light large wavelength proposed and demonstrated. The generated inclined light. measurement results...

Abstract We report a method of fabricating nano‐sized stack alignment layer. The stacked layer consists nano‐domains vertical and planar materials. Experiments reveal that photoalignment thin film can undergo dewetting form discrete domains. Such self‐organized structure creates discontinuous on top continuous hence produces an inhomogeneous surface. With two or more different principle directions, this new is capable producing multiple pretilt azimuth angle domains single substrate.

Vertically Aligned LCD is one of the most widely used optical modes in TV and mobile devices. It also a very important category passive LC displays Automobiles. has advantages perfect dark state high contrast ratio for normal viewing. However, single domain VA intrinsic issue dead zone (contrast vanishing zone) certain viewing direction voltage‐on state, which seriously limits its angle performance. Recently, State Key Laboratory on Advanced Displays Optoelectronics Technologies Hong Kong...

We achieve high‐framerate (< 100 μs) high‐contrast‐ratio ferroelectric liquid crystal displays (FLCD) on Gen 4.5. Innovatively, a new polyimide (PI) that is suitable for (FLC) alignment synthesized and tested the production line. It replaces Nylon 6 (N6), which was barrier to commercialization of FLCD. Moreover, FLC match requirements in mass production. Additionally, various materials were studied investigate surface energy relative performance. not only proof feasibility line, but also...