Session Index

A flexible CMOS inverter comprising a p-channel SnO and an n-channel IGZO thin-film transistors was fabricated on a polyimide substrate. This inverter exhibits a noise margin high, noise margin low, and static voltage gain of 4.8 V, 4.2 V, and 346 V/V, respectively, at a supply voltage of 10 V.

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We proposed a concept of switchable projection system for transparent display applications. The projection screen consists of a polarization-sensitive optical diffuse based on broadband cholesteric liquid crystal (CLC) and a polarization-modulator (PM) made of a linear polarizer, a twisted nematic liquid crystal (TNLC), and a quarter-wave plate. Such a projection system is able to switch between transparent and reflective states and provides high display quality with wide viewing angle and high contrast ratio.

 

This research and development can use light fields and electric fields to change the transmittance of smart windows. Photochromic dichroic dyes will change the window to a dark state when exposed to sunlight. The doped cholesteric liquid crystal can be switched from a transparent state to a scattering state through a voltage bistable state. And can switch four different states, transparent, scattering, dark transparent, and dark scattering. In the absence of applied voltage, each state is stable. This smart window can automatically adjust the penetration and can be manually adjusted to meet the needs of privacy.

 

An efficient blue phosphorescent organic light emitting diode, exhibiting turn on voltage of 2.8 V, current efficiency of 58.6 cd/A, power efficiency of 52.7 lm/W and external quantum efficiency of 27.5%, was demonstrated by using a host, based on carbazole and acridine (Ac) moieties as hybrid donor and benzimidazole moiety as acceptor. Ac featuring electron donating capability was thereby incorporated into donor segment to modify the energy level for improvement of hole transport in OLED. As a consequence, highest occupied molecular orbital (HOMO) of new host was approximately 5.4 eV, leading to low turn on voltage (< 3 V).

 

We report on a fast and multi-domain photo-alignment technique based on Digital Light Processing (DLP) system to pattern a complex photo-alignment image without expensive photomasks. This technique has great potential to fabricate some optical writing components such as security cards and liquid crystal grating.

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Due to the limited field-of-view of cameras, automatic optical inspection for large-size or curve displays with a single camera needs to be equipped with a motorized railing system. In order to keep to normal imagery, the movement range of the camera as well as the rail length is proportional to the panel size. In this work, we took an alternative scenario with camera rotation and geometric transformation via algorithms to increase the field-of-view of the system. Proposed algorithm was successfully demonstrated to register pixelwise illuminance of a commercial display at different camera panning angles.

 

This study applies color sensor and color correction for medical display monitor auto brightness. The results show that in the selection of training samples, factors such as the uniformity of the chromaticity and brightness distribution, how the samples are designed, etc., will have an impact on the calibration results.

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