Session Index

Display Technology

Poster Session II
Saturday, Dec. 4, 2021  09:30-11:30
Presider:
Room: Corridor
Notes:

Manuscript ID.  0294
Paper No.  2021-SAT-P0702-P001
Ting-Yi Yi Gate Driver with Triggering External Compensation Function for AMOLED Application
Meng-Yuan Chen;Ting-Yi Yi;Guang-Ting Zheng;Po-Tsun Liu

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.

 
 

Manuscript ID.  0037
Paper No.  2021-SAT-P0702-P002
Chia-Chen Chung Deep-red phosphorescent OLEDs with a wide electroluminescent spectrum for phototherapy light source
Chia-Chen Chung;Kuan-Wei Chen;Shan-Yu Chen;Wei-Ling Chen;Dun-Cheng Huang;Chih-Hao Chang

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.

 
 

Manuscript ID.  0251
Paper No.  2021-SAT-P0702-P003
Yu-Chih Lin Realizing efficient exciplex organic light-emitting diode through hole injection interface modification
Yu-Chih Lin

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%.

 
 

Manuscript ID.  0010
Paper No.  2021-SAT-P0702-P004
En-Le Su Effects of Eye Protection Modes of Smartphone Screen on Reading Safety and Clarity
En-Le Su;Pei-hsuan Hung;Chih-Ying Huang;Hao-Jen Chen;Yun-Jie Lin;Ming-Li Chou;Po-Ting Yeh;Jwo-Huei Jou

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.

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Manuscript ID.  0534
Paper No.  2021-SAT-P0702-P005
Yen-Ting Chen Enhancing Device Performance of CsPbBr3 Perovskite Light-Emitting Diodes with Polymer-Based Additive Material
Yen-Ting Chen;Zhao-Cheng Zhan;Ching-Ho Tien;Lung-Chien Chen

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%.

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Manuscript ID.  0024
Paper No.  2021-SAT-P0702-P006
Hung-Chung Li A stray light detection model for VR head-mounted display based on visual perception
Hung-Chung Li;Meng-Che Tsai;Tsung-Xian Lee;Yi-Yung Chen;Pei-Li Sun

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.

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Manuscript ID.  0321
Paper No.  2021-SAT-P0702-P007
Chieh-An Chen Deep-Blue Fluorescence Emitters Based on Acridine Moiety for OLED application
Chieh-An Chen;Chia-Hsun Chen;Bo-Yen Lin;Shao-Cheng Fang;Ken-Tsung Wong;Tien-Lung Chiu;Jiun-Haw Lee

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%.

 
 

Manuscript ID.  0536
Paper No.  2021-SAT-P0702-P008
Po-An Liu Influence of organic ammonium salt on the quasi-2D perovskite sky-blue light-emitting diodes
Po-An Liu;Wei-Chen Chiang;Ching-Ho Tien;Lung-Chien Chen

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%.

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Manuscript ID.  0539
Paper No.  2021-SAT-P0702-P009
You-Siang Wei Using Double-Stranded Ligands to Modify Perovskite Quantum Dots Applied to Light-Emitting Diodes
You-Siang Wei;Hui-Hsuan Tsai;Ching-Ho Tien;Lung-Chien Chen

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

 
 

Manuscript ID.  0542
Paper No.  2021-SAT-P0702-P010
Hsin-Pou Huang White Appearance of an E-reading Device under Easy Illuminance Levels
Hsin-Pou Huang;Hung-Chung Li;Guan-Hong Li;Chih-Chen Yeh

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.

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Manuscript ID.  0015
Paper No.  2021-SAT-P0702-P011
Shi-ya Chao Effectiveness Investigation of Anti-blue Light Screen Protectors for Mobile Phones
Shi-ya Chao;Yan-jia Peng;Yu-wei Chang;Ming-Tse Chen;Tzu-En Huang;Ming-Li Chou;Jwo-Huei Jou

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.

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Manuscript ID.  0034
Paper No.  2021-SAT-P0702-P012
Wen-Yan Peng Far-field Radiation Patterns of Light-emitting Diode with Different Chip Sizes
Wen-Yan Peng;Chun-Wen Chu;Bing-Mau Chen;Shang-Ping Ying

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.

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Manuscript ID.  0356
Paper No.  2021-SAT-P0702-P013
Ke-Yu Liu Study on the ULH formation of short-pitch cholesteric liquid crystals and the electro-optical characteristic
Han-Ping Tang;Tien-Jung Chen;Jin-Jei Wu;Ke-Yu Liu

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.

 
 

Manuscript ID.  0358
Paper No.  2021-SAT-P0702-P014
I-Fan Chen Study on the flexoelectro-optic effect of ULH cholesteric liquid crystals with three layer electrodes
Wei-Song Luo;Tien-Jung Chen;Jin-Jei Wu;I-Fan Chen

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.

 
 

Manuscript ID.  0360
Paper No.  2021-SAT-P0702-P015
Fang Tzu Lin Electrically Controllable Multistable Twisted Nematic Liquid Crystals
Fang Tzu Lin;Chun Ting Wu;Chih Yu Chen;Ko Ting Cheng

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.

 
 

Manuscript ID.  0040
Paper No.  2021-SAT-P0702-P016
Kuan-Hsun Wang Efficient green phosphorescent OLEDs with carbazole/triphenylamine-cyanobenzimidazole bipolar hosts
Kuan-Hsun Wang;I-Hsuan Chuang;Yu-Hsuan Chen;Dun-Cheng Huang;Chih-Hao Chang;Bhausaheb Patil;Jatin Lade;Yogesh Jadhav;Atul Chaskar

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.