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Feng Q.,Key Laboratory of Special Display Technology | Feng Q.,National Engineering Laboratory of Special Display Technology | Feng Q.,National Key Laboratory of Advanced Display Technology | Feng Q.,Hefei University of Technology | And 6 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

Different from common liquid crystal displays (LCDs), LCDs in aircraft cockpits have to satisfy some special requirements, including high luminance, high contrast ration, anti-reflection (AR), and electromagnetic compatibility (EMC). Indium-tin oxide (ITO) glasses are usually attached on the top surface of LC cells by optical adhesive for AR and EMC, forming laminated structure. The characteristics of optical adhesive and lamination processing have direct effects on display. This paper creates a finite-element-analysis model of the laminated LC cell with ITO glass. The simulation results show that the stress concentration happens in the case that there are defects (bubbles, cracks, nonuniform thickness) in the optical adhesive when the operation temperature raises to 70° C. Based on the analysis of the stress on the top surface of the LC cell in Y direction, it is found that the location of the stress concentration is just under where the defects exit. The comparison on the stress of 3 possible defects shows that the concentrated stress caused by the cracks are far more large than the stress by the bubbles and nonuniform thickness of optical adhesives, which should try best to avoid. © © 2012 SPIE.


Yang J.,National Key Laboratory of Advanced Display Technology | Yang J.,Hefei University of Technology | Yang Z.,Hefei University of Technology | Deng G.,National Key Laboratory of Advanced Display Technology | And 5 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2015

A novel type of two-stage slow wave structure (SWS), for-1 and + 1 harmonic modes, was developed for terahertz oscillator, based on the half-period-staggered double grating arrays, to improve the interaction efficiency and output power. The transition structure and the connecting waveguide between the SWSs were also designed. The SWS dispersion characteristics and the beam-wave interaction with two electron beams were physically modeled, theoretically analyzed, and numerically simulated with software 3-D particle-in-cell (PIC). The transmission losses of the whole RF structure and reflection coefficient were found to be S21>-12.51 dB and S11<-17 dB, respectively. The simulated results show that the novel two-stage SWS significantly enhances the interaction efficiency and output power. To be specific, with one 18 mA electron beam, the interaction efficiency of 1.7%, at a radiation of 0.3 THz, results in a high output power of 14.6 W at 299.5 GHz. We suggest that the newly-developed two-stage SWS be of some technological interest in design of terahertz vacuum electronic sources. ©, 2015, Science Press. All right reserved.


Deng G.,National Key Laboratory of Advanced Display Technology | Deng G.,Hefei University of Technology | Deng G.,Academy of Photoelectric Technology | Yang J.,National Key Laboratory of Advanced Display Technology | And 11 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2012

The transverse magnetic field distribution in the multi-beam periodic permanent magnet (PPM) focusing system was modeled and simulated. The influence of the coupled slot on the transverse magnetic fields in different beam tunnels was analyzed; the impact of saturation of the pole piece on different beam tunnels was evaluated. A novel technique was proposed to reduce the intensity of the transverse magnetic field in the multi-beam PPM focusing system. The simulated results show that a decrease of the separation between the coupled slot and beam tunnel results in an increase of the transverse magnetic field intensity, and the impact of the saturation of the pole piece on the beam tunnel linearly depends on the separation. When it comes to the intensity reduction of the transverse magnetic field, the multi-beam PPM focusing system with an increased radius of the ferrules outperforms the conventional one beam PPM focusing system.


Deng G.,National Key Laboratory of Advanced Display Technology | Deng G.,Hefei University of Technology | Yang J.,National Key Laboratory of Advanced Display Technology | Yang J.,Hefei University of Technology | And 4 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2014

The electromagnetic field distribution in the diffraction radiation device with dual-grating was physically modeled and analytically calculated. The influence of the geometry of the resonant cavity on the electric field intensity was evaluated. The calculated results show that the width of a rectangular cavity has a major impact on the electric field in the resonant cavity. For example, when the rectangular cavity has a height of λgroove/2, the resonance mode can be decomposed into an independent transverse electro magnetic (TEM) mode of the rectangular cavity and aquasi-TEM mode of the spherical-cylindrical open cavity. In addition, the quarter-wave transformer in resonant cavity does not effectively increase the field intensity in the rectangular cavity, but simultaneously affects the electro magnetic resonant mode and operating frequency.


Deng G.,National Key Laboratory of Advanced Display Technology | Deng G.,Hefei University of Technology | Yang J.,National Key Laboratory of Advanced Display Technology | Yang J.,Hefei University of Technology | And 4 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2014

We addressed the characteristics of mode competition in the dual-grating diffraction radiation devices. The impacts of the diffraction radiation conditions, including but not limited to the grating height, sheet beam height, and electron tunnel width, on suppression of the main interference mode, were experimentally evaluated. The slow wave mode oscillation on the surfaces of the grating which satisfies the open boundary condition was identified as the main interference mode in dual-grating diffraction radiation device. The results show that a reduction of the width of electron beam tunnel and an optimization of sheet beam height effectively suppress the oscillation of slow wave mode. Possible mechanisms responsible for suppressing slow wave mode oscillation were also tentatively discussed. ©, 2014, Science Press. All right reserved.

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