scholarly journals Concurrent Driving Method with Fast Scan Rate for Large Mutual Capacitance Touch Screens

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Mohamed Gamal Ahmed Mohamed ◽  
HyungWon Kim
Keyword(s):  
Conventional Method ◽  
Ambient Noise ◽  
Touch Screen ◽  
Experimental Results ◽  
Control Technique ◽  
Scan Rate ◽  
Mutual Capacitance ◽  
Rate Improvement ◽  
Snr Improvement ◽  
Touch Screens

A novel touch screen control technique is introduced, which scans each frame in two steps of concurrent multichannel driving and differential sensing. The proposed technique substantially increases the scan rate and reduces the ambient noise effectively. It is also extended to a multichip architecture to support excessively large touch screens with great scan rate improvement. The proposed method has been implemented using 0.18 μm CMOS TowerJazz process and tested with FPGA and AFE board connecting a 23-inch touch screen. Experimental results show a scan rate improvement of up to 23.8 times and an SNR improvement of 24.6 dB over the conventional method.

scholarly journals A Mutual Capacitance Touch Readout IC with Synchronization in Touch and Mobile Display Driving for High Refresh Rate AMOLED Panels

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 922
Author(s):  
Seunghoon Ko
Keyword(s):  
System Architecture ◽  
Noise Suppression ◽  
Touch Screen ◽  
Horizontal Line ◽  
Time Sharing ◽  
Refresh Rate ◽  
Front End ◽  
Scan Rate ◽  
Mutual Capacitance ◽  
Analog Voltage

This paper presents a mutual capacitance touch readout IC architecture for 120 Hz high-refresh-rate AMOLED displays. In high-refresh-rate AMOLED panels, whole pixels in a horizontal line should be updated without any time-sharing with each other, leading to an amplified display noise on touch screen panel (TSP) electrodes. The proposed system architecture mitigates severe display noise by synchronizing the driving for the TSP and AMOLED pixel circuits. The proposed differential sensing technique, which is based on noise suppression in reference to mutual capacitance channels, minimizes common-mode display noise. In the front-end circuit, intrinsic circuit offset is cancelled by a chopping scheme, which correlates to the phase of the driving signals in the TSP driver and operating clocks of the front-end. Operating at a 120 Hz scan-rate, it reduces display noise by more than 11.6 dB when compared with the conventional single-ended TSP sensing method. With a built-in 130-nm CMOS, a prototype IC occupies an area of 8.02 mm2 while consuming 6.4-mW power from a 3.3 V analog voltage supply.

Improved Load Sharing Control Techniques for Inverters used in a Microgrid

2009 ◽  
Vol 10 (1) ◽  
Author(s):  
Wei Yao ◽  
Zhaoming Qian
Keyword(s):  
Steady State ◽  
Transient Response ◽  
Single Phase ◽  
Load Sharing ◽  
Power Sharing ◽  
Experimental Results ◽  
Control Technique ◽  
Transient Performance ◽  
Control Techniques ◽  
Control Scheme

In this paper, an improved load sharing control scheme is presented, which is able to improve the transient response and power sharing accuracy of parallel-connected inverters used in microgrid. It also shows how the improved droop method can be easily adapted to account for the operation of parallel-connected inverters, providing good performance under the variation and disturbance of loads, as well as achieving good steady-state objectives and transient performance. Two DSP-based single-phase Microgrid inverters are designed and implemented. Simulation and experimental results are all reported, confirming the validity of the proposed control technique.

Enlargement of Grain Size and Location Control of Grain in Excimer-laser Crystallization of Si Film

2006 ◽  
Vol 910 ◽  
Author(s):  
Wenchang Yeh ◽  
Dunyuan Ke ◽  
Chunjun Zhuang
Keyword(s):  
Grain Size ◽  
Light Beam ◽  
Excimer Laser ◽  
Conventional Method ◽  
Growth Process ◽  
Laser Annealing ◽  
Glass Structure ◽  
Control Technique ◽  
Back Side ◽  
Excimer Laser Annealing

AbstractA technique for enlargement of grain size were shown and a technique for location controlled super lateral growth (SLG) grain in excimer laser annealing (ELA) were proposed and realized. In the technique for grain size enlargement, the grain size was enlarged to 10£gm that is more than 10 times larger than that in conventional method(~0.8£gm). The proposed sample structure was Si film/light absorptive film/Glass structure with applying the laser light from the back side of glass substrate. Time resolved(~1ns) optical measurement (TROM) revealed that the melt duration of Si film was increased to 800ns that is also 10 times longer than that in conventional method. As for the grain location control technique, a new method contains pre seeding process and post growth process were proposed and realized. In the pre seeding process, micro light beam(£g-light beam) was exposed to Si film to form a grain within the crystallized spot. £g-light beam was formed by micro-lens-array(MLA). After post growth process, single grain array with the diameters of 6£gm was formed in a period of 10£gm.

scholarly journals Vision-Based Classification of Mosquito Species: Comparison of Conventional and Deep Learning Methods

2019 ◽  
Vol 9 (18) ◽  
pp. 3935 ◽  
Author(s):  
Kazushige Okayasu ◽  
Kota Yoshida ◽  
Masataka Fuchida ◽  
Akio Nakamura
Keyword(s):  
Deep Learning ◽  
Conventional Method ◽  
Data Augmentation ◽  
Mosquito Species ◽  
Experimental Results ◽  
Support Vector ◽  
Learning Method ◽  
Species Classification ◽  
Scale Invariant ◽  
Machine Method

This study aims to propose a vision-based method to classify mosquito species. To investigate the efficiency of the method, we compared two different classification methods: The handcraft feature-based conventional method and the convolutional neural network-based deep learning method. For the conventional method, 12 types of features were adopted for handcraft feature extraction, while a support vector machine method was adopted for classification. For the deep learning method, three types of architectures were adopted for classification. We built a mosquito image dataset, which included 14,400 images with three types of mosquito species. The dataset comprised 12,000 images for training, 1500 images for testing, and 900 images for validating. Experimental results revealed that the accuracy of the conventional method using the scale-invariant feature transform algorithm was 82.4% at maximum, whereas the accuracy of the deep learning method was 95.5% in a residual network using data augmentation. From the experimental results, deep learning can be considered to be effective for classifying the mosquito species of the proposed dataset. Furthermore, data augmentation improves the accuracy of mosquito species’ classification.

scholarly journals Numerical Simulation of Mutual Capacitance Touch Screens for Ungrounded Objects

2017 ◽  
Vol 17 (16) ◽  
pp. 5143-5152 ◽  
Author(s):  
Christian Bjorge Thoresen ◽  
Ulrik Hanke
Keyword(s):  
Numerical Simulation ◽  
Mutual Capacitance ◽  
Touch Screens

A Study of Human Pointing Features on Touch-Screens -Age Effect, Difference by Gender, and Difference in Direction-

2007 ◽  
Vol 19 (6) ◽  
pp. 715-723 ◽  
Author(s):  
Masanobu Komazaki ◽  
◽  
Masanori Idesawa
Keyword(s):  
User Interfaces ◽  
Dynamic Properties ◽  
Movement Time ◽  
Touch Screen ◽  
Practice Effect ◽  
Touch Screens ◽  
And Gender ◽  
Set Up ◽  
Time Required ◽  
Interface Devices

We set up guidelines for designing graphic user interfaces (GUI), e.g., software-keyboards, for touch screens easier to used than conventional input (or interface) devices for IT systems such as keyboards and mice. We studied aging and gender differences in the dynamic properties of user pointing on a touch screen. We obtained the following results: (1) Standard Fitts’law did not hold very well when subjects repeated pointing using one finger between two targets close together on the touch screen. Movement-Time (MT) -the time required for pointing- increased linearly with the index of difficulty (ID) - the ratio of distance between targets (D) to target size (S). (2) Neither α -the ratio of the increase of MT to ID- nor β -MT when ID is 0- differed significantly between men and women. (3) α took almost the same value in older, middle-aged, and younger subjects, whereas β differed significantly between these groups. β increased linearly with age. (4) α and β did not differ significantly between left-right and depth in pointing. (5) The practice effect reduced the dispersion of α and β.

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