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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. Source


Feng Q.,Key Laboratory of Special Display Technology | Feng Q.,National Engineering Laboratory of Special Display Technology | Feng Q.,Huazhong University of Science and Technology | Feng Q.,Hefei University of Technology | And 11 more authors.
ICALIP 2010 - 2010 International Conference on Audio, Language and Image Processing, Proceedings | Year: 2010

True 3D display can provide more depth cues to viewers. Different from the 3D display developed by LightSpace Company, a single-DMD based true 3D display consists of a UHP lamp, a color wheel, a hollow integrator, a relay system, a DMD, projection lens, folder mirrors, 20 LC shutters, and several control circuits. The speed of the color wheel and circuits are required to be very high. The final luminance is 237cd/m2. The color gamut is 69.7% of the NTSC standard and the color temperature is 5407K. ©2010 IEEE. Source


Ruan J.,National Engineering Laboratory of Special Display Technology | Ruan J.,Hefei University of Technology | Yang J.,National Engineering Laboratory of Special Display Technology | Yang J.,Hefei University of Technology | And 4 more authors.
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2013

The thermal deformation of gridded electron gun in traveling wave tube has much influence on the performance of its electronic optics system and the problem has been investigated by means of the coupling of the thermal field and the mechanics field based on FEM (infinite element method). The results show that the total deformation of the anode is maximum and reaches 0.28 mm and the deformation of control grid, shadow grid, cathode and some supporting structure is toward the anode. Besides, contact or cross of control grid and shadow grid doesn't occur due to their deformation caused by temperature rise, while the cathode will contact the shadow grid when the deformation of the cathode is larger. The above contact will affect the performance of the gun, even cause the damage to shadow grid. The deformation of the components can be lessened by means of lowering probability of electron interception, thickening control grid and shadow grid properly as well as adopting the material with higher thermal conductivity and lower coefficient of linear expansion. Source


Liu L.,National Engineering Laboratory of Special Display Technology | Liu L.,Hefei University of Technology | Ruan J.,National Engineering Laboratory of Special Display Technology | Ruan J.,Hefei University of Technology | And 8 more authors.
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2011

Steady-state and transient thermal analysis of electron gun for a Ka-band traveling wave tube are theoretically performed with a newly-developed 2 mm cathode model by ANSYS software. The heat flux vector chart and temperature distribution chart as well as warm-up time are also derived. The discrepancy of 2% between simulation results and test results, proves that the finite element method is feasible. The ultimate temperature reached by cathode, at given heater power, remarkably depends on the thermal conduction mechanism through cathode module. Based on the heat flux vector chart, the structure of cathode support sleeve with the highest heat flux is optimized. After optimization, the temperature of cathode increases 28°C, the highest temperature of electron gun increases 27°C and the warm-up time of cathode reduces 40 s under the same given heater power. The optimized structure can effectively shorten the warm-up time of cathode by 33% and thus improve fast warm-up the performance of cathode, enhancing the rapid response capability of traveling wave tube. Source

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