Session Index

In this paper, a new a-Si TFT gate driver with providing the triggering signals to Vth compensation pixel circuit for the AMOLED application with external compensating block has been proposed. The proposed gate driver could provide the different pulse width signal using the additional triggering circuit block in the blanking time for the AMOLED. The simulating result shows not only reaches the goal for outputting another pulse for the blanking time but also achieves the measurement test with real panel loading.

 

In this study, a double emitting layer (EML) structure with a red Ir(piq)2acac and a deep-red Ir(fliq)2acac was designed to generate a broad EL spectrum. The host material of the EML used TCTA:CN-T2T exciplex system, aiming to boost the carrier density. The optimized OLEDs with a broad spectral profile possess a 90% coverage ratio in the target ranges from 630 to 690 nm, together with a high peak efficiency of 17.5%. The power density of the device recorded at 5 mW/cm2 was 5.9 V. These results illustrate the feasibility of our design concepts.

 

Optimizing the electroluminescence performance of organic light-emitting diode devices is critical for display and lighting applications. In this work, we modified the hole injection interface by inserting an electron donor interlayer and boosted the external quantum efficiency of the exciplex-based OLED to 18.08%.

 

Long-term browsing of smartphones can plausibly cause permanent damage to retina. To prevent, one can use the eye protection modes equipped therein. We had investigated the effectiveness of three features, i.e., default setting, blue light filter mode and dark mode, offered by three iPhones (i.e., iXR, i11 and i12 Pro) on reading safety and clarity. The results showed that both blue light filter and dark modes could significantly increase the permissible reading time. Nevertheless, the two modes had simultaneously compromised slightly the browsing clarity.

 

We prepare that by incorporating polyethylene oxide (PEO) into the CsPbBr3-perovskite to improve the morphology of an all-inorganic-perovskite emissive layer. Consequently, the optimized CsPbBr3-PEO LED exhibits a maximum luminance of 3664 cd/m2 and external quantum efficiency of 0.06%.

 

The research proposes a qualitative model derived from psychophysical experiments and the measurement of images on virtual reality devices. The machine learning algorithm establishes an evaluation method for the human eye-perceived stray light. Four approaches are compared and the model's accuracy is as high as about 90% by all algorithms.

 

A deep-blue fluorescence organic light emitting diode (OLED) was demonstrated by incorporating a novel emitter based on acridine moiety. The devices showed its max current efficiency (CEmax) of 0.56 cd/A, maximum power efficiency (PEmax) of 0.50 lm/W, maximum external quantum efficiency (EQEmax) of 0.97%, Commission Internationale de l'Eclairage (CIE) coordinates of (0.153, 0.061) and peak emission wavelength at 438 nm when the dopant concentration was 1%.

 

Adding Cl ions into CsPbBr3 to achieve sky-blue wavelength, these combinations will cause the emission wavelength to blue shift. Adding different proportions of PEABr, the 3D perovskites can be converted into a quasi-2D perovskites, the sky-blue perovskite LED show maximum luminance and EQE of 436 cd/m2 and 2.28%.

 

High-quality perovskite CsPbBr3 quantum dots (QDs-CsPbBr3) doped with Dimethyldidodecylammonium bromide (DDAB) material were prepared using hot-injection method. The photoluminescence of DDAB:QDs-CsPbBr3 was characterized by excitation wavelength of 523.1 nm, with narrow line-width emission of 20.47 nm. The QDLEDs exhibits a maximum luminance of 4637 cd/m2

 

A psychophysical experiment is carried out to understand the white appearance of a tablet display under 3500K and 6500 K with easy illuminance level of 150 lx and 300 lx. The results show that the observers rate a higher whiteness percentage for the whitest stimulus under the lower illuminance level.

 

In this research, we explore the effectiveness of different anti-blue light screen protectors. We found that the effectiveness of commercially available screen protectors are relatively limited; the highest effectiveness is only 15% and the lowest is 8%. If using color conversion films, the highest is 19 times better and the lowest is 1.6 times. The color conversion films exhibit yellowish or orangish color, which might compromise color fidelity. Hence, optimization should be made between the effectiveness and color fidelity.

 

Micro-LED displays have been regarded as the next generation of displays. However, the far-field radiation pattern of the micro-LED would be very different from the LED with large scale. In this study, the far-field radiation patterns of LED with different chip size are investigated by numerical calculation. The ratio of the light emitting from the top surface to the light emitting from side surface with different chip size are also conducted.

 

In this study, we have developed cholesteric liquid crystals with different pitches. The cholesteric liquid crystals are formed into a ULH (Uniform Lying Helix) structure through the cooling phase transition and the application of uneven horizontal fields, respectively. The electro-optical properties of the ULH structure are discussed.

 

In this study, a ULH structure of cholesteric liquid crystal is combined with a three-layer electrode structure. The cholesteric liquid crystal is applied with an inhomogeneous horizontal electric field to form a ULH structure, and then four types of vertical electric field are used to generate optical switching of the ULH structure with sub-millisecond response.

 

In this work, a twisted nematic liquid crystal (TNLC) cell with appropriate pitch length and cell gap, which is capable of electrically switching between the twisted and homeotropic states, was fabricated. Furthermore, the characteristics of optical properties of such a TNLC cell was investigated by comparing the simulated and experimental transmittance spectra.

 

Host materials must have higher triplet energy than the emitter to ensure exothermic energy transfer. To attain balanced charge transport for phosphorescent OLEDs, we proposed new host materials with carbazole/triphenylamine as hole transporting moiety and cyano along with benzimidazole as electron transporting core. Both bipolar compounds, TPA-ImdCN and 4-Cbz-ImdCN, possess good thermal, photophysical, and electrochemical properties, which are suitable to combine with Ir(ppy)3. The device with 4-Cbz-ImdCN host exhibited higher peak efficiencies of 11.4%, 39.3 cd/A, and 46.8 lm/W. These results clearly implied that these molecular designs possess a high potential for developing bipolar hosts.