Editorial
03 April 2023
Feng Chi
, Qiang Xu
and
Dan Luo
Editorial: Physical model and applications of high‐efficiency electro‐optical conversion devices, volume II
Editors
3
Impact
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Original Research
23 December 2022
A 10 bit 1 MS/s SAR ADC with one LSB common-mode shift energy-efficient switching scheme for image sensor
Yunfeng Hu
, 2 more and
Zichuan Yi
A 10 bit 1 MS/s SAR ADC with one LSB common-mode shift energy-efficient switching scheme for image sensor is presented. Based on the two sub-capacitor arrays architecture and the common-mode technique, the proposed switching scheme achieves 98.45% less switching energy over the conventional architecture with common-mode shift in one LSB. The comparator uses a low power dynamic comparator. The sampling switch adopts a bootstrap circuit with low sampling error. SAR logic is composed of Bit-Slice circuit with low power consumption and few transistors. Simulated in 180 nm CMOS process and 1 MS/s sampling rate, the ADC achieves the 60.06 dB SNDR, the 75.43 dB SFDR and the 10.45 μW power consumption.
Brief Research Report
14 November 2022
Lian-Liang Sun
and
Jia Liu
949 views
0 citations
Brief Research Report
28 October 2022
Minqiang Liu
, 2 more and
Cen Xiong
1,191 views
1 citations
Original Research
21 October 2022
Taiyuan Zhang
, 2 more and
Hailing Sun
1,619 views
2 citations
Original Research
12 October 2022
A high integration electrowetting displays system based on AC driving model
Shixiao Li
, 3 more and
Pengfei Bai
As a representative of new reflective display technology, the electrowetting display (EWD) has been widely accepted for its good advantages in power consumption control and display contrast. Because of charge trapping and contact angle hysteresis, static images cannot be maintained and afterimage phenomenon occurs, respectively. These problems seriously affect the EWDs display effect. In order to improve the video display effect of EWDs, an alternating current (AC) driving model was proposed in this paper. Firstly, a high integration EWDs system was built with Xilinx field programmable gate array (FPGA). Secondly, an asymmetric intermediate frequency (IF) AC driving model was proposed to eliminate the afterimage of the video. Finally, the optimized driving method was applied to the EWDs system to achieve a high-smooth display output. The experimental results showed that the problem of afterimage and the problem of static image preserving display were effectively solved. Compared with the traditional AC driving waveform, the maximum reflected luminance of the proposed method was increased by 14%, and the refresh rate of EWDs could reach 60 Hz.
Brief Research Report
29 September 2022
Reflectivity enhancement of full color tri-layer electrowetting display with polymer cholesteric liquid crystal films
Beibei Zhang
, 5 more and
Dong Yuan
Electronic paper display has received increasing attention due to its outstanding properties of wide viewing angle, bistable state and lower energy consumption. Among various electronic paper display technologies, electrowetting e-paper (EWD) is the most promising as it can achieve full-color display by using stacked layers or RGB color filter. However, the EWD is faced with several challenges, including poor color brightness, low contrast ratio and small color gamut. To improve the performance of the EWD, we proposed a new configuration of EWD consisting of three independent PCLC reflection films based on the cholesteric liquid crystal materials. We designed and experimentally fabricated three types of reflection films, and then added the PCLC films to the tri-layered EWD device. We experimentally characterized the reflectivity and color gamut of the sample in the dark room. It is found that the experimental results and simulation results match with each other. It is demonstrated that with the PCLC films, the reflectivity is improved by 20%, while the color gamut is improved by 80%, which is sufficient for the daily display demand of E-paper. The proposed EWD device containing PCLC reflection films provide a new strategy to improve the brightness and color gamut of current EWD device, and is promising for realizing the full-color E-paper display.
Original Research
11 October 2022
Hongwei Jiang
, 3 more and
Guofu Zhou
1,403 views
0 citations
Brief Research Report
20 September 2022
Quantum dot scanning tunneling microscopy for Majorana bound states in continuum
Hai-Rui Zhang
and
Yong-Ping Sun
We propose a device composed of a quantum dot (QD) connected to a normal metal lead to detect Majorana bound states (MBSs), which are formed at the ends of a topological superconductor nanowire (TSNW) and coupled to the lead with spin-dependent hybridization strengths. The information of the MBSs leaked into the lead is inferred from the spectral function of the QD serving as the tip of a scanning tunneling microscope (STM). It is found that lead–MBSs interaction induces a bound state characterized by an infinitely high peak in the dot’s zero-energy spectral function. The overlap between the two modes of the MBSs turns this bound state into a resonant one, and thus the zero-energy peak is split into three with the height of the central one equaling that in the absence of lead–MBSs coupling. We also find that the MBSs have lower impacts on the additional peak in the dot’s spectral function induced by intradot Coulomb interaction.
Original Research
08 August 2022
An arc multi-electrode pixel structure for improving the response speed of electrowetting displays
Shufa Lai
, 3 more and
Biao Tang
Electrowetting display (EWD) is a new generation of reflective display technology with low power consumption and high contrast. To improve the response speed of pixels, an arc multi-electrode pixel was proposed, and its performance was verified by using the established three-dimensional model in this paper. According to the model, the influence of the arc multi-electrode pixel structure on response speed was simulated, and the influence of a driving sequence on oil movement inside pixels were analyzed. In addition, comparative experiments of oil movement inside pixels with single-electrode and arc multi-electrode were conducted. Experimental results showed that the response time of the arc multi-electrode structure was 0.9 ms faster than the single-electrode structure in a pixel opening stage. In the pixel closing stage, the oil recovery time can be accelerated by applying a boosting voltage to the electrode corresponding to the oil accumulation area, which was 2.3 ms faster than that of the single-electrode structure.
Original Research
09 September 2022
Yunfeng Hu
, 3 more and
Kai Wang
1,745 views
2 citations