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- 2019
- LED AC direct driver IC
- THD adjustment
- different situation
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- Optoelectronic Information Science and Engineering
- Zhejiang University
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1.3: An Evaluation Method of TFT Integrated Gate Driver for UHD Display
摘要： Reliability issues of TFT integrated gate driver are still of great concern for large size (i.e. TV) display applications, especially for a-Si:H TFT integrated panels with stressing test of high temperature and high humidity (HTHHO). In this paper, current detection method is proposed for gate driver failure identification. Measurements of 55-inch UHD TV (4K) panel with integrated gate driver are carried out. It is found that gate driver failure after HTHHO are strongly associates with via- hole open of clock bus-lines. It is demonstrated that current through clock lines will be increased with prolonged falling edge due to multi-pulses of gate driver outputs. And clock bus-line open is caused by oxygen of Cu after long operating time during the stressing test.
关键词： threshold voltage shift,reliability,TFT integrated gate driver
更新于2025-09-10 09:29:36
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Free-Space Detection with Self-Supervised and Online Trained Fully Convolutional Networks
摘要： Recently, vision-based Advanced Driver Assist Systems have gained broad interest. In this work, we investigate free-space detection, for which we propose to employ a Fully Convolutional Network (FCN). We show that this FCN can be trained in a self-supervised manner and achieve similar results compared to training on manually annotated data, thereby reducing the need for large manually annotated training sets. To this end, our self-supervised training relies on a stereo-vision disparity system, to automatically generate (weak) training labels for the color-based FCN. Additionally, our self-supervised training facilitates online training of the FCN instead of offline. Consequently, given that the applied FCN is relatively small, the free-space analysis becomes highly adaptive to any traffic scene that the vehicle encounters. We have validated our algorithm using publicly available data and on a new challenging benchmark dataset that is released with this paper. Experiments show that the online training boosts performance with 5% when compared to offline training, both for Fmax and AP.
关键词： Self-supervised training,Fully Convolutional Network,Advanced Driver Assist Systems,Online training,Free-space detection
更新于2025-09-10 09:29:36
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Multioutputs single-stage gate driver on array with wide temperature operable thin-film-transistor liquid-crystal display for high resolution application
摘要： A hydrogenated amorphous silicon (a‐Si:H) thin‐film transistor (TFT) gate driver with multioutputs (eight outputs per stage) for high reliability, 10.7‐inch automotive display has been proposed. The driver circuit is composed of one SR controller, eight driving TFTs (one stage to eight outputs) with bridging TFTs. The SR controller, which starts up the driving TFTs, could also prevent the noise of gate line for nonworking period. The bridging TFT, using width decreasing which connects between the SR controller and the driving TFT, could produce the floating state which is beneficial to couple the gate voltage, improves the driving ability of output, and reaches consistent rising time in high temperature and low temperature environment. Moreover, 8‐phase clocks with 75% overlapping and dual‐side driving scheme are also used in the circuit design to ensure enough charging time and reduce the loading of each gate line. According to lifetime test results, the proposed gate driver of 720 stages pass the extreme temperature range test (90°C and ?40°C) for simulation, and operates stably over 800 hours at 90°C for measurement. Besides, this design is successfully demonstrated in a 10.7‐inch full HD (1080 × RGB×1920) TFT‐liquid‐crystal display (LCD) panel.
关键词： thin film transistor (TFT),wide temperature,high reliability,gate driver,amorphous silicon (a‐Si)
更新于2025-09-09 09:28:46
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A Novel Method for Classifying Driver Mental Workload Under Naturalistic Conditions With Information From Near-Infrared Spectroscopy
摘要： Driver cognitive distraction is a critical factor in road safety, and its evaluation, especially under real conditions, presents challenges to researchers and engineers. In this study, we considered mental workload from a secondary task as a potential source of cognitive distraction and aimed to estimate the increased cognitive load on the driver with a four-channel near-infrared spectroscopy (NIRS) device by introducing a machine-learning method for hemodynamic data. To produce added cognitive workload in a driver beyond just driving, two levels of an auditory presentation n-back task were used. A total of 60 experimental data sets from the NIRS device during two driving tasks were obtained and analyzed by machine-learning algorithms. We used two techniques to prevent overfitting of the classification models: (1) k-fold cross-validation and principal-component analysis, and (2) retaining 25% of the data (testing data) for testing of the model after classification. Six types of classifier were trained and tested: decision tree, discriminant analysis, logistic regression, the support vector machine, the nearest neighbor classifier, and the ensemble classifier. Cognitive workload levels were well classified from the NIRS data in the cases of subject-dependent classification (the accuracy of classification increased from 81.30 to 95.40%, and the accuracy of prediction of the testing data was 82.18 to 96.08%), subject-independent classification (the accuracy of classification increased from 84.90 to 89.50%, and the accuracy of prediction of the testing data increased from 84.08 to 89.91%), and channel-independent classification (classification 82.90%, prediction 82.74%). NIRS data in conjunction with an artificial intelligence method can therefore be used to classify mental workload as a source of potential cognitive distraction in real time under naturalistic conditions; this information may be utilized in driver assistance systems to prevent road accidents.
关键词： mental workload,near-infrared spectroscopy,artificial intelligence,driver attention,cognitive distraction,classification
更新于2025-09-09 09:28:46
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30.2: Amorphous Silicon Thin-Film Transistor Gate Driver Circuit Design with Time Division Driving Method for In-Cell Touch Display Panel
摘要： In this paper, an integrated hydrogenated amorphous silicon (a-Si:H) thin-film transistor (TFT) gate driver circuit design with the time division driving method is demonstrated for in-cell touch display panels. The design can avoid long-term biasing of the pull-up TFT in the conventional gate driver circuits and address the issues due to leakage current at Q node in the circuit during the touch sensing period. Therefore, the overall reliability of the circuit is improved. The design of the circuit is also simple without needing any additional signal inputs. As a result, the proposed circuit design can be used to pause display operation to perform touch sensing operation several times per frame, which can realize 60 Hz display scanning and 120 Hz touch reporting rate.
关键词： GOA,Time division driving,Gate driver on array,In-cell touch
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - Auckland, New Zealand (2018.8.5-2018.8.8)] 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - A 120Gbps VCSEL-Based Parallel Optical Module Design
摘要： This paper gives the details of an optical module for 12-channel VCSEL (Vertical-Cavity Surface-Emitting Laser) based design for VSR (Very Short Reach) application. The 12-channel VCSEL driver chip is designed and implemented in a standard 0.18-μm CMOS process. The output stage utilizes C3A (Capacitively Coupled Current Amplifier) structure to speed up the fall time of the laser output waveform. The test results show that the eye diagram of any channel operates at 10 Gbps. Finally, the optical module is packaged with MPO multi-mode connector.
关键词： C3A,laser driver,optical connection,VCSEL
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Portland, OR, USA (2018.9.23-2018.9.27)] 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Stretching in Time of GaN Active Gate Driving Profiles to Adapt to Changing Load Current
摘要： Active gate driving, where the gate signal is actively profiled, has been shown to reduce EMI, overshoot, and switching loss, in silicon power converters. Recently, much faster gate drivers with the ability to profile at a 100 ps resolution have been reported, which has opened up the possibility of actively driving emerging wide-bandgap devices. This could allow Gallium Nitride (GaN) and Silicon Carbide (SiC) FETs to be switched faster than is currently possible, as unwanted switching features such as current ringing at turn-on could be eliminated. However, these drivers have previously only been demonstrated with pre-programmed gate profiles that have been optimized at certain operating conditions, whereas converters typically operate in a range of conditions. In this paper, some limitations of using fixed gate profiles on GaN FETs are reported for the first time, and a new method of profile adaptation is demonstrated. First, the gate profiles in a 400 V GaN bridge-leg are optimized to minimize current ringing at turn-on for a given load current. Then, the load current is varied, showing that the gate signal profile remains close to optimal for ±20% changes in current. Also, over a larger range of at least ±35%, the profiled waveform performs better than a non-profiled gate waveform. It is then demonstrated that by slightly reducing the driver’s internal clock frequency with increasing load current, the profile is re-optimized for new load currents. It is concluded that driver clock frequency adaptation may be a means of adapting gate profiles to load current variation and possibly also to temperature variation.
关键词： Active Gate Driving,Arbitrary Waveform Gate Driver,GaN Gate Driver,Dynamic Output Resistance Gate Driver,GaN FET
更新于2025-09-04 15:30:14
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[IEEE 2018 15th European Radar Conference (EuRAD) - Madrid, Spain (2018.9.26-2018.9.28)] 2018 15th European Radar Conference (EuRAD) - A DC to 40 GHz, High Linearity Monolithic GaAs Distributed Amplifier with Low DC Power Consumption as a High Bit-Rate Pre-Driver
摘要： This paper presents the design and the performance of a six stage GaAs MMIC distributed amplifier (DA) for optical driver applications. The DA is fabricated in a commercially available 0.15 μm GaAs p-HEMT technology. The amplifier exhibits 13 dB of small gain over 40 GHz of 3 dB bandwidth with a power consumption equal to 550 mW. Group delay time variation up to 30 GHz is only ±7 ps. The output power is higher than 16 dBm (4 Vpp), which makes the circuit suitable as a preamplifier for lithium-niobate (LiNbO3) optical modulator driver. The DA is demonstrated as a part of the modulator driver in a 12.5 GBps PAM-4 (25Gbps) optical system by using the eye diagram as a figure of merit.
关键词： Optical Drives,LiNbO3 Optical modulator,electro-optical modulation,Wideband amplifier,Optical amplifier,modulator,Traveling-wave amplifier,pre-driver,MMIC,Distributed Amplifier
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE Photonics Conference (IPC) - Reston, VA, USA (2018.9.30-2018.10.4)] 2018 IEEE Photonics Conference (IPC) - 40-Gbit/s 850-nm VCSEL-Based Full-CMOS Optical Link with Power-Data Rate Adaptivity
摘要： An optical link based on directly modulated vertical-cavity surface-emitting laser (VCSEL) at 850-nm wavelength using commercial VCSEL and photodiode operating error-free (BER < 10?12) at 40 Gbit/s is reported. The transmitter is implemented in a 14-nm FinFET CMOS while the receiver (RX) in 28-nm digital bulk-CMOS technologies. This is the fastest 850-nm VCSEL-based single-lane non-return-to-zero optical link with all the analog front-end components fabricated in CMOS. An energy-per-bit of 3.4 pJ/bit is measured at 40 Gbit/s. At the circuits can be decreased adaptively to save power. This results in 2.7 pJ/bit at 20 Gbit/s. A sensitivity of ?1.9 dBm optical modulation amplitude could be measured at the RX for 40 Gbit/s.
关键词： VCSEL,laser driver,CMOS integrated circuits,Optical interconnects,optical receiver
更新于2025-09-04 15:30:14
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[Lecture Notes in Computer Science] Internet of Vehicles. Technologies and Services Towards Smart City Volume 11253 (5th International Conference, IOV 2018, Paris, France, November 20–22, 2018, Proceedings) || Development of a Mobile Functional Near-Infrared Spectroscopy Prototype
摘要： Driving is a complex and cognitively demanding task. It is important to assess the cognitive state of the driver in order to develop cognitive technical systems that can adapt to different cognitive states of the driver. For this purpose, we have developed a mobile functional near-infrared spectroscopy (mofNIRS) prototype. This paper describes the improvements of this mobile prototype with freely placeable optodes on a subject’s head and the results of an evaluation study. We conducted a motor cortex experiment with four subjects, whereby the mobile prototype was mounted on the right hemisphere and a commercial, stationary fNIRS on the left hemisphere above the motor cortex area. One data set had to be discarded due to incorrect synchronization between both systems. The results of the remaining three subjects are presented and discussed in this paper. Here, we report the results from the time-series and Statistical Parametric Mapping (SPM) analyses, which shows t-values with high differentiability of the Results. Furthermore, both analysis methods show comparable results between the commercial system and the mobile prototype.
关键词： Validation study,Motor cortical activity,Mobile fNIRS prototype,Driver cognitive states
更新于2025-09-04 15:30:14