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Organic Light-Emitting Devices and Their Applications for Flat-Panel Displays
Published in Zhigang Rick Li, Organic Light-Emitting Materials and Devices, 2017
When an AMOLED display panel is used for graphic or video applications, the average power consumption is only 20–50% of that consumed at 100% pixel light on at full intensity (depending on image content), reducing the power consumption further by two to five times.187,188 It is worth mentioning that OLED displays are of superb performance at temperatures below room temperature (with fast response time, sustaining EL efficiency and a longer operation lifetime), in contrast to AMLCDs’ performances at low temperature.
Cloud VR Terminals
Published in Huaping Xiong, Dawei Li, Kun Huang, Mu Xu, Yin Huang, Lingling Xu, Jianfei Lai, Shengjun Qian, Cloud VR, 2020
Huaping Xiong, Dawei Li, Kun Huang, Mu Xu, Yin Huang, Lingling Xu, Jianfei Lai, Shengjun Qian
OLED is classified into active matrix OLED (AMOLED) and passive matrix OLED (PMOLED) based on the driving mode. AMOLED features high efficiency and low power consumption and can easily implement high brightness, high resolution, and a high color range. In addition, it is easier to improve integration and decrease the size of components in AMOLED displays, making them more common in smartphones and also preferable in the display of VR headsets.
Impact of high-resolution matrix backlight on local-dimming performance and its characterization
Published in Journal of Information Display, 2019
Maxim Schmidt, Michael Grüning, Julian Ritter, Andreas Hudak, Chihao Xu
High contrast, low power, high lifetime and thin panels are key parameters of high-quality displays. A promising technology to fulfill these demands is LCD with high-resolution matrix backlight by applying local-dimming [1]. It may generate high luminance and deliver excellent black level as demanded by HDR and automotive application. In addition, the panel may get thin due to the higher amount of LEDs used. Compared to AMOLED displays, it may have advantages in brightness, cost and lifetime and may outperform Edge-Lit LCDs in the visual quality and power saving. With decreasing cost for LEDs and new technologies like Mini LEDs, high-resolution backlight units (BLU) may find wide application in cars, TVs and mobile devices.
Analysis of heat diffusion considering driving images on 6-inch flexible AMOLED display
Published in Journal of Information Display, 2023
Chang Hoon Jeon, Ji Woong Park, Byung Wook Kang, Su Hyuk Jang, Kyung Joon Kwon, Soon Kwang Hong, Yong Min Ha, Jin Jang
Flexible active-matrix organic light-emitting diode (AMOLED) displays offer various benefits such as pure black, fast response, wide viewing angle, rich color and flexibility [1]. However, unlike liquid crystal display (LCD), it is difficult to avoid the burn-in phenomenon because of the short lifetime of AMOLED displays [2]. The burn-in behavior is a key issue in AMOLED displays, especially in blue OLEDs. Note that the red and green OLEDs with phosphorescence materials have a relatively long lifetime [3]. In addition, out-coupling technology has been developed to reduce current density by extracting the light dissipating inside AMOLED displays [4,5].
Modelling localized charge-injection region of the p-channel low-temperature polycrystalline silicon thin-film transistor
Published in Journal of Information Display, 2018
KwangHyun Choi, YoungHa Sohn, GeumJu Moon, YongSang Kim, Jae-Hong Jeon, KeeChan Park
The application of the active-matrix organic light-emitting diode (AMOLED) display was recently expanded to include smartphones, TVs, and wearable devices owing to its high image quality, lightweight, and free-form factor. The low-temperature polycrystalline silicon (LTPS) thin-film transistor (TFT) is the optimal device for OLED driving in the backplane of small and medium-sized AMOLED displays owing to its high carrier mobility and stability. The off-state drain current of the LTPS TFT, however, often exceeds 1 pA, and it further increases tens or hundreds of times when the reverse gate-to-drain bias becomes as large as the gate-induced drain leakage (GIDL) current that prevails [1,2]. To suppress the large GIDL current of the LTPS TFT exclusively for the p-channel device, charge-injection bias stress is applied to some critical switching devices in the pixel after completing the fabrication. Under the bias stress condition, a large positive gate bias and a negative drain bias are applied to the p-channel TFT. As a result, a number of electrons are injected into the gate insulator near the drain, and they relieve the electric field near the drain during the off-state [3]. It was found that the localized charge in the gate insulator does not only reduce the GIDL current but also changes the threshold voltage of the TFT for short-channel devices. In this study, the density of the injected charge and the length of the charge-injection region in the gate insulator were estimated by fitting the measured threshold voltage (VT) change and the GIDL current reduction using the TCAD (technology computer-aided design) model. The estimation results accord quite well with the measurement results of the 4- and 10-µm-channel-length devices even though they were extracted from the characteristics of a 2-µm-channel-length device.