Session Index

Display Technology

Display Technology I
Thursday, Dec. 2, 2021  13:15-15:00
Presider: Prof. Chong-Yi Lee Prof. Li-Yin Chen
Room: 302c
13:15 - 13:30 Award Candidate (Paper Competition)
Manuscript ID.  0510
Paper No.  2021-THU-S0701-O001
Hong-Ru Chen Flexible Oxide-Based CMOS Inverters with High Gain
Hong-Ru Chen;Shu-Ming Hsu;Dung-Yue Su;Feng-Yu Tsai;I-Chun Cheng

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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13:30 - 13:45 Award Candidate (Paper Competition)
Manuscript ID.  0230
Paper No.  2021-THU-S0701-O002
Chun-Chuan Wang A switchable projection system based on broadband Cholesteric Liquid Crystal reflector
Chun-Chuan Wang

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.

13:45 - 14:00 Award Candidate (Paper Competition)
Manuscript ID.  0307
Paper No.  2021-THU-S0701-O003
Chen-Yi Lin Hybrid photo- and electrical-controllable smart window
Chen-Yi Lin

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.

14:00 - 14:15 Award Candidate (Paper Competition)
Manuscript ID.  0326
Paper No.  2021-THU-S0701-O004
Ching-Huang Chiu Efficient blue phosphorescent organic light-emitting diode by employing hybrid-donor-acceptor host
Ching-Huang Chiu;Bo-Yen Lin;Chia-Hsun Chen;Man-kit Leung;Jiun-Haw Lee;Tien-Lung Chiu

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).

14:15 - 14:30 Award Candidate (Paper Competition)
Manuscript ID.  0242
Paper No.  2021-THU-S0701-O005
Yi-Jyun Ke Realized large-scale and multi-domain photo-alignment technique based on digital light processing system
Yi-Jyun Ke

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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14:30 - 14:45 Award Candidate (Paper Competition)
Manuscript ID.  0287
Paper No.  2021-THU-S0701-O006
Yu-Chen Chou Automatic Optical Inspection of Pixel Illuminance for Displays at Oblique Perspectives
Yu-Chen Chou;Chieh-En Lee;Po-Yuan Hsieh;Chung-Hao Tien

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.

14:45 - 15:00 Award Candidate (Applied Optoelectronics Competition)
Manuscript ID.  0654
Paper No.  2021-THU-S0701-O007
Yi-Ming Li Auto brightness and color correction for medical display monitor with color sensor
Yi-Ming Li;Wen Meng;Chih-Yu Tsai;Tsung-Xian Lee

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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Display Technology

Display Technology II
Thursday, Dec. 2, 2021  15:15-17:00
Presider: Prof. Tsung-Hsien Lin Prof. Ko-Ting Cheng
Room: 302c
15:15 - 15:30
Manuscript ID.  0067
Paper No.  2021-THU-S0702-O001
CHIA-YU YEN Angle independent linear polarization rotator using twist nematic liquid crystals

We reported a linear polarization rotator that is based on single-substrate-liquid crystal polymer film fabricated by spin coating technique. Such a linear polarization rotator operated at the first order of Gooch-Tarry condition exhibits incident-angle independence in a specific angle range.

15:30 - 15:45
Manuscript ID.  0471
Paper No.  2021-THU-S0702-O002
Shao-Hao Liao Biphotonically switchable reflection bandwidth expansion using chiral azobenzene-doped cholesteric liquid crystals
Ko-Ting Cheng;Cheng-Kai Liu;Ming-Hong Yuan;Shao-Hao Liao

An approach to modulate the bandwidth of reflection light of chiral azobenzene-doped cholesteric liquid crystals (CAdCLCs) is reported. Pitch length of CAdCLCs illuminated by green and purple lights can be decreased and increased, respectively. The expansion of bandwidth of reflection light of CAdCLCs by simultaneously illuminating green and purple lights on the same side and on the opposite sides of CAdCLC cell is investigated. The optimized method to expand bandwidth of CAdCLCs is also discussed.

15:45 - 16:00
Manuscript ID.  0693
Paper No.  2021-THU-S0702-O003
Chia-Yu Lee Minimizing Color Metamerism of Camera-based Display Measurement
Chia-Yu Lee;Pei-Li Sun;Hung-Chung Li

Since the spectral responses of commonly used camera sensors do not have a linear relationship with the CIE color matching functions, it shows serious metamerism color mismatch in the measurement of different types of displays. Color errors caused by the instrument-to-observer metamerism are effectively reduced by a proposed 5-stage method which takes spectral radiance of the reference and the test displays into account.

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16:00 - 16:15
Manuscript ID.  0365
Paper No.  2021-THU-S0702-O004
Sin-Wei Lin Control of Smart Windows Based on Double Layer Dichroic Dye-doped Nematic Liquid Crystals via Face Recognition System
Sin-Wei Lin;Cheng-Kai Liu;Ko-Ting Cheng

This paper reports that a liquid crystal smart window based on double layer dichroic dye-doped nematic liquid crystals can be switched between transparent and dark states via the face recognition system consisting of programming language and circuit design.

16:15 - 16:30
Manuscript ID.  0331
Paper No.  2021-THU-S0702-O005
Ching-Huang Chiu New thermally activated delayed fluorescence emitter for high efficiency OLED
Ching-Huang Chiu;Bo-Yen Lin;Chia-Hsun Chen;Man-kit Leung;Jiun-Haw Lee;Tien-Lung Chiu

A OLED using a new thermally activated delayed fluorescence (TADF) emitter achieved excellent performances in terms of current efficiency of 49.42 cd/A, power efficiency of 44.05 lm/W and external quantum efficiency of 18.14%. Moreover, the OLED presented blueish green emission wavelength of 496 nm, corresponding to color coordinates of (0.194, 0.429). Besides, the transient electroluminescence of the device exhibited an obviously delayed emission with decay time of approximately 2.39 μs, indicating delayed fluorescence character. Accordingly, employing the new TADF dopant in EML in OLED showed high efficiency, which was attributable to the effective utilization of triplet excitons.


Display Technology

Display Technology III
Friday, Dec. 3, 2021  10:45-12:00
Presider: Prof. Lung-Chien Chen Prof. Jiun-Haw Lee
Room: 302c
10:45 - 11:15
Manuscript ID.  0732
Paper No.  2021-FRI-S0703-I001
Invited Speaker:
Hidenori Mimura
Growth of drawable CNT and its application to a data glove
Hidenori Mimura

11:15 - 11:30 Award Candidate (Paper Competition)
Manuscript ID.  0587
Paper No.  2021-FRI-S0703-O001
Dian Luo Efficiently near-infrared organic light-emitting diodes with exciplex co-host system
Dian Luo;Yi-Sheng Chen;Wei-Chih Wei;Bo-Lin Chen;Tzu-Hung Yeh;Shun-Wei Liu;Ken-Tsung Wong

By matching the emission spectrum of the exciplex co-host with the absorption spectrum of the near-infrared emitter, the Förster resonance energy transfer (FRET) process boosts the maximum external quantum efficiency of the near-infrared organic light-emitting diode to 5.3% with an electroluminescence wavelength of 774 nm.

11:30 - 11:45 Award Candidate (Paper Competition)
Manuscript ID.  0117
Paper No.  2021-FRI-S0703-O002
Zhi-Wen Wu Full color QD based Micro-LED with Nanoporous structure
Zhi-Wen Wu;Chao-Hsu Lin;Yu-Tang Cheng;Yu-Hao Liou;Hao-Chung Kuo

We demonstrated a new nanostructure with QD color conversion layer to reduce the thickness of the device. In the second part of the research, the multiple light scattering of nanoporous (NP) GaN was fabricated and applied QD for Micro-light-emitting diode (Micro-LED) display applications. Colloidal QDs were printed into NP-GaN by using ink-jet printing technique, and 92.3% and 97.6% of light conversion efficiencies for green and red were achieved, respectively. Furthermore, NP-GaN structure embedded with QD could avoid self-aggregation effect after inkjet printing.

11:45 - 12:00 Award Candidate (Paper Competition)
Manuscript ID.  0631
Paper No.  2021-FRI-S0703-O003
Yi-Jui Chen A New Mini-LED Backlight Driving Circuit with Low Power Consumption for LCDs
Yi-Jui Chen;Yu-Sheng Lin;Chia-Ling Tsai;Chih-Lung Lin

A mini-LED driving circuit using LTPS TFTs to provide uniform driving currents with low power consumption. Simulation results indicate that the relative current error rates are below 7.34% with VSS rise of 0.5 V as VTH varies ±0.3 V. Compared to 6T1C circuit, proposed circuit improve power consumption by 23.75%.

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Display Technology

Poster Session I
Friday, Dec. 3, 2021  14:00-16:00
Presider: Prof. Chih-Lung Lin Prof. Shui-Hsiang Su Prof. Tien-Lung Chiu
Room: Corridor
Award Candidate (Paper Competition)
Manuscript ID.  0435
Paper No.  2021-FRI-P0701-P001
Ching-An Chih Liquid crystal privacy films using dual liquid crystal alignment structures
Ching-An Chih;Yu-Ci Huang;Ko-Ting Cheng

With the benefit from the properties of the adopted materials, such as polyhedral oligomeric silsesquioxanes (POSS), photoresist, and dichroic dyes (S428), in this study, vertical and hybrid alignments form periodic structures in a liquid crystal (LC) cell to get the same properties as privacy films.

Award Candidate (Paper Competition)
Manuscript ID.  0138
Paper No.  2021-FRI-P0701-P002
Tzu-Yu Hsu Plasmonic Effects of Gold Nanoparticles on the Performance of TADF Organic Light-Emitting Diodes
Huai-Yu Lei;Tzu-Yu Hsu;Fang-Chung Chen

Amphiphilic Au nanoparticles (NPs) decorated with PEGylated graphene oxides (AuNPs@PEG-GO) were synthesized to incorporate into thermally activated delayed fluorescence organic light-emitting diodes (TADF OLEDs) for improving the device performance. Because AuNPs@PEG-GO could be well dissolved in both deionized water and organic solvents, we blended the amphiphilic Au NPs into the poly(3,4-ethylenedioxythiophene): polystyrenesulfonate (PEDOT:PSS) layer and the organic photoactive layers of TADF OLEDs simultaneously to realized dual plasmonic structures. The the device performance had been significantly improved due to the effects of localized surface plasmon resonance. The current efficiency has been enhanced by up to 68%.

Award Candidate (Paper Competition)
Manuscript ID.  0319
Paper No.  2021-FRI-P0701-P003
Chia-Hsun Chen High Efficiency Thermal Activated Delayed Fluorescence Organic Light-Emitting Diode Based on Naphthyridine Derivatives Emitter
Chia-Hsun Chen;Jing-Xiang Huang;Rasa Keruckiene;Bo-Yen Lin;Juozas Vidas Grazulevicius;Tien-Lung Chiu;Jiun-Haw Lee

In this research, a novel green thermal activated delayed fluorescence emitter based on naphthyridine (ND) derivatives, was synthesized and employed as high efficiency organic light-emitting diode (OLED). By optimizing the dopant concentration of emitter in the emitting layer (EML), maximum external quantum efficiency (EQE) reached 14.9% with CIE coordinates of (0.36, 0.57).

Award Candidate (Paper Competition)
Manuscript ID.  0038
Paper No.  2021-FRI-P0701-P004
Chen-Hsun Wu Blue-emitting non-doped OLEDs with triphenylethene-carbazole-based aggregation-induced emission molecules to realize high luminance
Chen-Hsun Wu;Cheng-Yung Ho;Wei-Han Lin;Jhao-Cheng Lu;Chih-Hao Chang;Gintare Krucaite;Raminta Beresneviciute;Saulius Grigalevicius

Tetraphenylethene (TPE) has been demonstrated to be an effective core molecule for generating excellent aggregation-induced emission. This study proposed a new series of AIE compounds based on a triphenylethene moiety decorated with different carbazole-based substitutions. The carbazole and triphenylethene moieties shared a phenyl to sustain a TPE structure. As indicated, the non-doped blue-emitting organic light-emitting diodes (OLEDs) with GK235 emitter exhibited satisfactory peak efficiencies of 3.9%, 10.2 cd/A, and 10.6 lm/W. In addition, the maximum luminance was up to 39661 cd/m2, indicating our molecular and device designs possess a high potential for fabricating non-doped blue OLEDs.

Award Candidate (Paper Competition)
Manuscript ID.  0142
Paper No.  2021-FRI-P0701-P005
Nai-Ren Chang Improvement in 80×160 Passive-Matrix μ-LED Display via Passivation Coatings
Nai-Ren Chang;Po-Hao Chen;Po-Wei Chen;Po-Liang Liu;Dong-Sing Wuu

The 80×160 passive-matrix μ-LED display was fabricated by using the laser direct writing and ALD techniques. The leakage current from sidewall defects were suppressed by an Al2O3 passivation layer from ALD system because of the non-plasma process and high surface coverage features. The illuminance of 866 cd/m2 was obtained.

Award Candidate (Paper Competition)
Manuscript ID.  0178
Paper No.  2021-FRI-P0701-P006
Jing-Yuan Su Metal-Organic Frameworks as Hole Injection Materials for Organic Light-Emitting Diodes
Hoong Lien Lai;Jing-Yuan Su;Fang-Chung Chen

In this work, a simple method for preparing thin films of a family of metal-organic framework, zeolitic imidazolate framework-8 (ZIF-8), which behave as hole injection layers in organic light-emitting diodes (OLEDs) is proposed. The ZIF-8 thin films are prepared through spin-coating of zinc nitrate hexahydrate (Zn(NO3)2·6H2O) and 2-methylimidazole (2-mIm) sequentially from their dimethylformamide (DMF) solutions. The brightness and current efficiency of the OLEDs using the ZIF-8 thin films achieve 600 cd/m2 and 3.8 cd/A, respectively. Our result indicates that ZIF-8 could be a simple solution-processable hole-injection layer for OLEDs.

Award Candidate (Paper Competition)
Manuscript ID.  0180
Paper No.  2021-FRI-P0701-P007
Chih-Wei Lo Color-converted Micro-LEDs Displays with CdSe/ZnS@SiO2 Quantum Dots and Distributed Bragg Reflector
Chih-Wei Lo;Kai-Ping Chang;Chung-Jui Wu;Po-Wei Chen;Chao-Chun Yen;Dong-Sing Wuu

CdSe/ZnS@SiO2 quantum dots (QDs) are mixed into SU-8 photoresist to realize 50 µm × 50 µm QDs color-converted μ-LED display. The distributed Bragg reflector is applied on the red/green QDs pixels to reflect 98.44% of the blue light and almost no restrictions on red/green light, suitable for full-color displays applications.

Award Candidate (Paper Competition)
Manuscript ID.  0439
Paper No.  2021-FRI-P0701-P008
Yuan-Chang Tsai Waveguide liquid crystal devices with asymmetrical light scattering properties and their applications
Yuan-Chang Tsai;Sheng-Wen Wang;Cheng-Kai Liu;Ko-Ting Cheng

The main topic reported in this study is waveguide liquid crystal (LC) devices with asymmetrical light scattering properties and their applications. The key points we discuss herein include the asymmetrical light scattering optical characteristics when an edge light source is coupled into the proposed LC devices applied with suitable electric fields, and then scattered out of the LC devices.

Award Candidate (Paper Competition)
Manuscript ID.  0325
Paper No.  2021-FRI-P0701-P009
Jing-Xiang Huang Efficient deep blue OLED achieved by a new fluorophore
Jing-Xiang Huang;Bo-Yen Lin;Chia-Hsun Chen;Jian-Haur Lee;Chin-Ti Chen;Tien-Lung Chiu;Jiun-Haw Lee

We have developed a new fluorescent compound for a deep-blue organic light emitting diode
(OLED). The emission of the fluorescent emitter in solid film was 397 nm. We applied this fluorescent
material to fabricate a non-doped OLED. As a consequence, external quantum efficiency (EQE) of this
non-doped OLED was superior as high as 4.92% and also showed a deep blue emission with peaks of
382 nm and 398 nm, respectively. The emission wavelength of device is less 400 nm and which belongs
ultra violet (UV) region, corresponding to Commission Internationale de l'Eclairage (CIE) y coordinate
by 0.0423.

Award Candidate (Paper Competition)
Manuscript ID.  0141
Paper No.  2021-FRI-P0701-P010
Dian Luo Flexible light-emitting electrochemical cells employing muscovite mica substrates
Dian Luo;Yu-Ru Li;Tzu-Hsin Hsiao;Yi-Ching Chen;Rong-Huei Yi;Chin-Wei Lu;Chih-Hao Chang;Hai-Ching Su

Efficient flexible light-emitting electrochemical cells (LECs) are fabricated on novel silicon-gallium-doped zinc oxide (SGZO) coated muscovite mica substrates. The proposed flexible LECs show excellent mechanical resistance, which can maintain more than 80% of the device performance after 10000 bending cycles with a radius of curvature of 10 mm.

Award Candidate (Paper Competition)
Manuscript ID.  0039
Paper No.  2021-FRI-P0701-P011
Jui-Ming Wong Transparent flexible electrode consisting of AgCr alloy and Mo-doped GaZnO
Jui-Ming Wong;Ming-Jung Lin;Meng-Hsuan Chiu;Chih-Hao Chang

We propose a new flexible transparent electrode that combines an ultra-thin metal alloy film with MGZO. The results showed that this highly transparent electrode showed low sheet resistance values before and after bending, demonstrating that the AgCr/MGZO composite film possesses great potential for the transparent electrode in flexible optoelectronics applications.

Award Candidate (Paper Competition)
Manuscript ID.  0185
Paper No.  2021-FRI-P0701-P012
Yu-Han Chen Research of Amorphous Indium Zinc Oxide Thin Film Transistors for Low Illumination and High Responsivity Photo Sensor
Yu-Han Chen;Yu-Chuan Chiu;Jia-Lin Huang;Po-Tsun Liu

A single layer of amorphous InZnO is chosen as the channel material for a thin film transistor (TFT)-based driver and sensing layer for a blue-light sensor, respectively, with a completely compatible process integrated into in-cell embedded photo sensor architecture. The photo sensor exhibits a high optical responsivity (1720 A/W) and good signal to noise ratio (~103) under the low blue light illumination. Afterwards, the detail studies and important issues about the sensing and material characteristics of a-IZO thin film in the TFT sensor are discussed.

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Manuscript ID.  0400
Paper No.  2021-FRI-P0701-P013
Chun-Chieh Chu Bipolar Emitter for Non-Doped White-light Organic Light-emitting Diode Application
Chun-Chieh Chu;Chia-Hsun Chen;R. Keruckiene;Bo-Yen Lin;Chi-Feng Lin;Tien-Lung Chiu;Jiun-Haw Lee;J. V. Grazulevicius

A bipolar emitter was synthesized for non-doped white organic light-emitting diode application which exhibited Commission Internationale d'Eclairage (CIE) coordinates of (0.31, 0.29).


Manuscript ID.  0338
Paper No.  2021-FRI-P0701-P014
Wei-Chung Chen High-Protection Structure of Low-Diffraction Transparent Micro LED Display
Ying-Ting Liou;Wei-Chung Chen

In this work, we show the high protection structure of low-diffraction flexible transparent Micro LED display, featuring high transmittance, high background clarity and high protection effect. There were lots of technological innovations such as a unique pixel design, fabrication on PI substrate, and high strength-stress characteristics. Finally, we demonstrate the display with the high-protection film layer, the results showed the transmittance would not be reduced, the anti-diffraction effect remains the same, and it also has the good characteristics of scratch resistance, abrasion resistance and impact resistance.

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Manuscript ID.  0624
Paper No.  2021-FRI-P0701-P015
Che-Yu Li Green Organic Light-emitting Diodes with Low Turn-on Voltages
Che-Yu Li;Chia-Hsun Chen;Shih-Chun Lin;Bo-Yen Lin;Chi-Feng Lin;Ken-Tsung Wong;Tien-Lung Chiu;Jiun-Haw Lee

Novel bipolar host material with 4CzIPN as the dopant by three different concentrations, 6%, 10%, and 13% were demonstrated. The optimums device shows the external quantum efficiency of 21.4%, the low turn-on voltages of 2.4V at 1 cd/m2, the luminance of 4185 cd/m2 at 6V ,EL spectral peak of 516 nm, and CIE coordinates of (0.277, 0.582) and low efficiency roll-off under high luminance.


Display Technology

Display Technology V
Saturday, Dec. 4, 2021  09:00-10:30
Presider: Prof. Chan-Shan Yang Prof. Hung-Shing Chen
Room: 302c
09:00 - 09:30
Manuscript ID.  0733
Paper No.  2021-SAT-S0705-I001
Invited Speaker:
Jian Hsu
Color Conversion in III-Nitride Micro-LEDs with Embedded Nanostructures
Jian Hsu

09:30 - 09:45
Manuscript ID.  0392
Paper No.  2021-SAT-S0705-O001
Jun-Yu Huang A Complete Exciton Diffusion Model Including Both Singlet and Triplet behavior Couple with Poisson and Drift-Diffusion Solver
Jun-Yu Huang;Kung-Chi Hsu;Chia-Hsun Chen;Tien-Lung Chiu;Jiun-Haw Lee;Yuh-Renn Wu

In this work, we developed a complete exciton diffusion model to help researchers to understand and analyze exciton behavior in organic light-emitting diodes (OLEDs), especially triplet-triplet fusion and thermally activated delayed fluorescence OLEDs. This exciton diffusion model considers both singlet and triplet exciton to simulate OLEDs performance successfully, which includes singlet-singlet quenching, triplet-triplet quenching, triplet-singlet annihilation, triplet-triplet annihilation.

09:45 - 10:00
Manuscript ID.  0642
Paper No.  2021-SAT-S0705-O002
Si Min Chou Defect Inspection System of Direct-Light Backlight and Human Visual Judge System of Just Noticeable Difference
Si Min Chou

We have considered the problem that the backlight image will cause serious LED brightness's unevenness in the insufficient light mixing distance. Experimental results have shown that the proposed method can successively detect and locate defects in a direct-light backlight, achieve the purpose of high-speed development process and efficient products management.

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10:00 - 10:15
Manuscript ID.  0557
Paper No.  2021-SAT-S0705-O003
Ta-Wei Hsiao Using Hopkin’s equation to simulate optical lithography
Snow H. Tseng;Ta-Wei Hsiao

We presented a numerical result for computation lithography patterns using Hopkins’s equation. We investigated the lithography patterns under different sources wavelength and numerical apertures. We observed that the line width of the pattern increases as the numerical aperture NA changes from 1.56 to 1.2 due to the diffraction effect.

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10:15 - 10:30
Manuscript ID.  0158
Paper No.  2021-SAT-S0705-O004
Chi-Cheng Lung Reduced Viewing Distance of LED Displays by Increasing Effective Emitting Area of LED through Light Diffuser Films
Chi-Cheng Lung;Li-Yin Chen

In this work, the minimum required viewing distance of a large-size LEDs with pixel pitch of 4 mm was reduced by covering optical diffusers. The light passed through the diffuser from LED was re-distributed evenly to hide the LED hot spot and increase the effective emitting area. The minimum required viewing distance decreased from 11.4 m to < 5 m with the high effective emission area, but also caused some side effects which may downgraded image quality. We used MTF calculated by the LSF to compare the evaluate image quality.

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Display Technology

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

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.