In order to compensate the threshold voltage variation while obtaining the sufficient data charging time, the AMOLED compensative pixel circuit needs to be driven by multi-pulse signals which have continuous high/low level pulses. By using traditional gate driver on array (GOA) with half duty-cycle delay of clock signals, the area of shift register is doubled, increasing the bezel width and power consumptions. In this paper, novel compact integrated gate driver circuit architectures for AMOLED pixel compensation purpose are presented. Outputs with programmable pulse width and number are achieved in these gate driving circuits without consuming extra large areas. Inner feedback technique is adopted in GOA circuit for leakage current cutting of depletion mode IGZO TFTs. The simulation result shows that these circuits work successfully with maximum ±3V threshold voltage shift. These GOA circuits can be used for internal or external Vth compensation techniques of AMOLED panel.
In recent years, smart home security industry has achieved rapid development, and people have increasing demand of smart home security system. While, because of traditional security system's technical limitations, which results in a single function, and the overall monitor could not be realized. Therefore, this paper mainly makes use of Android technology and ZigBee, Wi-Fi wireless sensor communication network, providing a flexible and convenient wireless solution for the construction of smart home security system. The system adopts modular idea, and achieves various function such as home environmental monitoring, video surveillance, fire automatic alarm, burglary automatic alarm, gas leakage alarm, intelligent control of household appliances and other functions, as a result, home life becomes more safer, more comfortable and more convenient. After experimental test, the system runs well and reaches the expected target, and has good practical value.
A novel gate driver on array (GOA) circuit topology based on pulse width modulation (PWM) technique has been proposed for internal compensation AMOLED pixel driving. The output width of PWM GOA basic unit can be easily adjusted by tuning start pulse (STU) signal width. The performance of this circuit has been verified by simulation and the prototype has been fabricated in 5 inch AMOLED panel with IGZO TFT process. There are three main features of PWM GOA circuit, (1) PWM GOA is properly designed with depletion mode IGZO TFTs (2) Output pulse width can be easily changed by tuning STU's width without additional circuits (3) Interface and accessory of PWM GOA is custom designed to realize different function of each block. ThisGOA structure provides a practical way to realize narrow bezel design.
According to the output value of gravitational sensors and speed of vehicles, one back-propagation (BP) neural network model is established. The genetic algorithm is used to optimize the BP neural network. This method can speed up the convergence and avoid getting stuck in the local minimum. The experiment results show that the optimizing BP neural network algorithm based on genetic algorithm can reduce the average error of the calculation and prediction. And the accuracy and efficiency of the weigh-in-motion (WIM) system are improved.
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