18.1: <i>Invited Paper</i>: Oxide TFT Driving Transparent AMOLED

Park, Sang‐Hee Ko; Ryu, Min-Ki; Yang, Shinhyuk; Byun, Chun‐Won; Hwang, Chi‐Sun; Cho, Kyoung Ik; Im, Woo-Bin; Kim, Young Eun; Kim, Taesu; Ha, Young-Bo; Kim, Kyoung-Bea

doi:10.1889/1.3500418

Cited by 26 publications

(12 citation statements)

References 3 publications

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“…As shown in figure 1, a1 is the signal of incident, b1 is the reflection of the signal, and b2 is the signal transmission, so the S21 parameters shows the ratio of transmission signal and the incident signal, equivalent to the ratio of output power and input power as b2/a1 [4]. Because the OLED device contains many metal electrodes (the anode and cathode) and many metal lines (SD metal and gate) [5], so it is likely to bring the shielding effect on the signal transmission of antennas. The thickness of different metal layers in OLED device was shown as figure 2, and the whole OLED device MDL structure was shown as figure 3.…”

Section: The Transmission Coefficient At High Frequencymentioning

confidence: 99%

P‐95: Influences of OLED Metal Layers on the Transmission of Electromagnetic Waves at Different Frequencies

Liu

Zhang

et al. 2021

Symp Digest of Tech Papers

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Nowadays, with the development of new IoT display applications and 5G antenna extension, the display companies attached more and more attentions on the integration of antenna. This Paper studied the influences of OLED metal layer on the transmission performance of electromagnetic wave at different frequencies, and analyzed the reference locations of antenna integration. The electromagnetic wave penetrating test of network analyzer in S21 mode was made, and 13.56 MHz, 2.4 GHz, 5 GHz and 28 GHz were selected as the marked frequency points. We found the transmission coefficient of S21 in whole module panel was −0.005599dB (99.9356%) at 13.56MHz, but the value was decreased as −0.4702dB (89.74%) at 2.4GHz and −1.56dB (69.6%) at 5GHz, finally dropped to −11.353dB (7.32%) at 28GHz. Moreover the influence of different thickness metal layers in OLED module has been compare. We found the influence of metal layer thickness on electromagnetic waves penetration gradually increased as the frequency increasing, but influence of the metal film continuity reduced. Finally, by comparing the transmission coefficient of different metal layers, we thought the best location for 5G antenna integration was the none display area which far away from the metal layers in OLED, but the HF antenna as 13.56Mhz or other frequency lower than 2.4GHz can be integrated under the OLED devices, in the back plate layer, or upper the display area.

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Section: The Transmission Coefficient At High Frequencymentioning

confidence: 99%

P‐95: Influences of OLED Metal Layers on the Transmission of Electromagnetic Waves at Different Frequencies

Liu

Zhang

et al. 2021

Symp Digest of Tech Papers

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“…For example, a see-throughtype transparent AMOLED can be realized using oxidebased semiconductors. 23 Using such types of displays, one can see the objects in the opposite side of the displays, and thus many interesting applications can be created. Since the transparency of such displays mostly relies on the use of a large transmission area or highly transparent materials, high resolution and high transparency can not be obtained at the same time, typically.…”

Section: Oxide Tfts With Transparent Oledsmentioning

confidence: 99%

Active‐matrix organic light‐emitting diode displays with indium gallium zinc oxide thin‐film transistors and normal, inverted, and transparent organic light‐emitting diodes

Hsieh¹,

Tsai²,

Chang³

et al. 2011

J Soc Info Display

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Abstract— Active‐matrix organic light‐emitting diode (AMOLED) displays have gained wide attention and are expected to dominate the flat‐panel‐display industry in the near future. However, organic light‐emitting devices have stringent demands on the driving transistors due to their current‐driving characteristics. In recent years, the oxide‐semiconductor‐based thin‐film transistors (oxide TFTs) have also been widely investigated due to their various benefits. In this paper, the development and performance of oxide TFTs will be discussed. Specifically, effects of back‐channel interface conditions on these devices will be investigated. The performance and bias stress stability of the oxide TFTs were improved by inserting a SiOx protection layer and an N2O plasma treatment on the back‐channel interface. On the other hand, considering the n‐type nature of oxide TFTs, 2.4‐in. AMOLED displays with oxide TFTs and both normal and inverted OLEDs were developed and their reliability was studied. Results of the checkerboard stimuli tests show that the inverted OLEDs indeed have some advantages due to their suitable driving schemes. In addition, a novel 2.4‐in. transparent AMOLED display with a high transparency of 45% and high resolution of 166 ppi was also demonstrated using all the transparent or semi‐transparent materials, based on oxide‐TFT technologies.

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“…Especially, LCD and OLED system have been intensively proposed to form transparent display. [ 18–26 ] However, these systems can cause problems that the display performance is deteriorated due to the light environment, particularly under strong light condition. Furthermore, low transmittance is another issue to be enhanced.…”

Section: Introductionmentioning

confidence: 99%

Reflective‐Type Transparent/Colored Mirror Switchable Device Using Reversible Electrodeposition with Fabry–Perot Interferometer

Sung

Han

Song

et al. 2020

Adv Materials Technologies

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light condition. Furthermore, low transmittance is another issue to be enhanced. To retain the stability of outdoor visibility, the intensity of illumination is necessarily increased, which lead to eye fatigue and increase power consumption. To ensure the properties of outdoor visibility and high energy efficiency, reflective-type display can be a solution technique. In particular, electrochromic devices based upon the reversible electrodeposition (RED) technology is suitable for transparent display. RED system realizes transparent and reflective mode as selectively formed and removed the reflector. [27-36] Although RED has potential to be used as the display applications, there are insufficient attempts on show colors. In typical display, pigment/dye-based and structural-based color filters have been studied to absorb or emit specific wavelengths. Despite pigment/dye-based color filter has wide viewing angle and high color ratio, it has low chemical stability and imperfect color impurity. [37-39] Whereas, structuralbased color filter such as plasmon resonance [40-43] and Fabry-Perot (FP) interferometer [44-51] on the basis of the interaction between nanostructure and incident light provides the merits of spectral selectivity, chemical and thermal stability. These advantages led to obtain multicolor in single RED device by controlling the silver structure for plasmonic resonance. [52-56] However, fine control the metal structure for multicolor is essential, which can affect limitation to reproducibility and stability. On the other hand, there is no case for multicolored RED device with FP interferometer. FP-type color filter generates only the selected light by using the thin-film interference effect of multiple reflected waves from reflector. Therefore, various colors can be tuned by variety of materials and controlled cavity with simple process. In terms of robustness to variation cavity, material that have low refractive index is proper to form the thin films. [46] Moreover, low absorption characteristic in visible range is required to reduce the optical loss. Compared to others, indium-tin-oxide (ITO) has relatively low refractive index and low absorption spectra in visible range. In this paper, we first proposed a new structure for a transparent/colored mirror switchable RED device by integrating the micropixelated ITO (red, green, and blue: RGB) cavities for the FP interferometer. A variable thickness of ITO films and partially reflective Tungsten (W) film were used as Reversible electrodeposition (RED) devices have been considered as the optical transmittance or reflectance switchable display for the reflective display applications. In this study, transparent/colored mirror switchable RED device is demonstrated by integrating the Fabry-Perot (FP) interferometer. Indium-tin-oxide (ITO)-based FP interference effect is utilized for color filter to emit particular wavelength. Color-switchable RED cells are researched using ITO (red, green, and blue (RGB)) films and tungsten (W) films as partially reflective la...

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18.1: Invited Paper: Oxide TFT Driving Transparent AMOLED

Cited by 26 publications

References 3 publications

P‐95: Influences of OLED Metal Layers on the Transmission of Electromagnetic Waves at Different Frequencies

P‐95: Influences of OLED Metal Layers on the Transmission of Electromagnetic Waves at Different Frequencies

Active‐matrix organic light‐emitting diode displays with indium gallium zinc oxide thin‐film transistors and normal, inverted, and transparent organic light‐emitting diodes

Reflective‐Type Transparent/Colored Mirror Switchable Device Using Reversible Electrodeposition with Fabry–Perot Interferometer

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