Session Index

We demonstrate a new series of donor-acceptor-donor borylated compounds with an extremely small energy gap between triplet and singlet excited states, which easily generates an intramolecular charge transfer upon excitation. The high electroluminescent efficiencies, together with mitigated efficiency roll-off, illustrate that these compounds have a high potential for EL applications.

 

Both biphenyl or anthracene substitutions were adopted to decorate the triphenylethene moiety for the construction of new aggregation-induced luminescence compounds for the organic light-emitting diodes applications.The respective peak efficiencies of sky blue-emitting devices with GK160 and GK162 reached 3.8% (8.8 cd/A, 7.4 lm/W) and 2.2% (4.0 cd/A, 3.0 lm/W).

 

Three kinds of organic hole transport material/electron transport materials combinations are adopted to generate blue,green, and red exciplexes. Both photoluminance and lifetime measurements of the exciplex behavior of the combinations indicated that the HTM and ETM selected should possess higher energy bandgaps than the corresponding exciplex to avoid energy loss.

 

Electrically tunable lenses using liquid crystal is widely studied. To achieve this technology, the complicated process is common. But in this study, our process only needs one lithography step, therefore complex fabrication is unnecessary. Using a high-permittivity layer and floating electrodes design is the key point to approach this technology.

 

High- and low-refractive-index hybrid materials were prepared by doping with silica 4.6 wt% into the polyimide as the external light-extraction layers for organic light-emitting diodes (OLEDs). The external quantum efficiency of the device with external light-extraction layer increases to 15.92%.

 

Triplet excitons in green fluorescent dye, aluminum-tris-quinolate (Alq3), were recycled and reused for light emission with the adjacent 9,10-Di-(2’- naphthyl) anthracene (ADN) layer through triplet-triplet annihilation and energy transfer process. Emission color of the OLED can be tuned from bluish green to orange with the addition of the red fluorescence dopant 4-(Dicyanomethylene)-2- tert-butyl-6-(1,1,7,7-tetramethyljulolidin-4-yl-vinyl)-4H-pyran (DCJTB)

 

Blue emission in exciplex sensitized triplet-triplet annihilation organic light-emitting diode (ESTTA-OLED) was enhanced by the inserting layer 1,3-bis[2-(2,2’-bipyridine-6-yl)-1,3,4-oxadiazo-5-yl]benzene (Bpy-OXD) between the donor layer, 4,4’,4’’-tris(3-methylphenylphenylamino)triphenylamine (m-MTDATA) and blue triplet-triplet annihilation (TTA) layer, 9,10-di(2-naphthyl)anthracene (ADN) to inhibit the singlet quenching by the exciplex, formed at the interface of m-MTDATA/Bpy-OXD.

 

In this study, an added coaxial floating-ring in a hole-patterned liquid crystal lens shows improved characteristics, which is capable of lower operating voltages (0-20 Vrms) and 13.5 mm minimum focal length. Meanwhile, the capabilities of tunable focal lengths are also compared with a hole-patterned electrode liquid crystal lens.

 

We investigated an organic light-emitting diodes (OLEDs) with ultra-thin silver anode, whereas Ag was deposited on a roughened glass substrate processed by laser patterning. Therefore, we report an ITO-free, phosphorescent OLED with a luminance of 97,950 cd/m2 at 8 V, and maximum external quantum efficiency of ∼12.78% at 7,150 cd/m2.

 

We demonstrated electrically switchable wavelength and focal length tunable reflective Fresnel lenses using reflective liquid crystal spatial light modulator (RLC-SLM). On the basis of the real time switches of Fresnel Zone Plates (FZP), the desired color light focusing based on color sequential and additive color techniques can be realized.

 

By post treatment with acidic resin during the encapsulation process on a red quantum dot light emitting diode (QLED), we demonstrated the performance of red QLED with significant enhancement of: (1) lower driving voltage, (2) higher luminance, (3) current efficiency improvement.

 

We observed the electro-thermally tunable Bragg bandgap in a cholesteric liquid crystal containing a nematic host with negative dielectric anisotropy and a left-handed chiral dopant. The center wavelength of Bragg’s bandgap can be tuned between ultraviolet and near infrared by modulating either frequency or amplitude of externally applied voltage.

 

The highly flexible low temperature polycrystalline silicon (LTPS) TFT devices with stress-absorbing (SA) structure were demonstrated and applied for flexible AMOLED applications. It shows that the Vth shifts less than 0.09V under the folding radius of 1mm for 100K folding times.

 

The transparent display of the direct-view augmented reality system requires the panel resolution of 5000 ppi, the transmittance of 60 %, and the luminance of 1600 nit. Besides, the color dispersion and difficult manufacture are must overcome in the system.

 

In this study we investigate how the addition of the bent-core molecule CB7CB in a typical cholesteric liquid crystal modifies the phase behaviors and temperature-dependent dielectric characteristics.

 

The physical properties and impact factors of in-cell touch technology combined with transparent AMOLED are analyzed by using simulation methods for the purpose of optimizing the electrical characteristics. A real verification of touch function, the panel touch can be operated precisely and has a touch function of ≥ 5 points.

 

The flexible device by sheet-to-sheet process had to be de-bonded from the carrier glass. In this study, a debonding layer with moderate debonding force was demonstrated. The delamination ratio in TFT process is reduced from 94% to 0%. The brightness maintenance ratio is higher than 99%.

 

We propose a 70% transmittance and duel-side visible transparent AMOLED. The array has 88% aperture ratio structure and removing unnecessary inter layer which induce major absorption. The OLED transmittance was more than 80% with IZO cathode and used LiF:Al to prevent damage of cathode sputtering.

 

This paper propose the readability of text for a transparent display based on a vision experiment. According to the reading rate as a function of the luminance of text, the limitations of LCR in white background with white, red, green and blue text are 1.31, 1.14, 1.21 and 1.08, respectively.

 

This study investigated the spontaneous vertical alignment of liquid crystal (LC) cells by a gelator. The electro-optical curve of a gelator-doped negative LC cell was similar to that of a VA host LC cell. The doped LC cell had a faster response time than a VA host LC cell.

 

In this paper, we propose a FPGA-based information enhancement system for the image fusion, which can be applied to the transparent display systems. The proposed system strengthens the contrast between the displayed information and the background and it supports 1920×1080 resolution @ 30 FPS for the real-time applications.

 

Low temperature polycrystalline silicon (LTPS) TFTs array was demonstrated by Digital Lithography (DLG) technology with features of resolution (L/S) ≤5m and overlay accuracy ≤3.0 μm. The DLG technology also shows advantages such as maskless for cost saving, high production efficiency, and allows for rapid changes of the pattern, etc.

 

In this article, low temperature polycrystalline silicon (LTPS) TFTs with hidden-interconnected structure for high aperture ratio, anti-static and light-shielding properties were demonstrated. The LTPS TFTs with decent electrical characteristics exhibited field-effect mobility of ~64 cm2/Vs, Vth of -0.72±0.3 V and S.S of 0.49±0.03 V/decade.