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Zhang D.,China Mobile | Chen W.,Key Laboratory of Special Display Technology | Yin Z.,Hefei University of Technology
2012 International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2012 | Year: 2012

A novel dual-mode bandpass microstrip filter using cascaded square loop resonators for TD-LTE application is presented. It is composed of two square rings and designed at the operating frequency of 2595 MHz with a bandwidth of 50 MHz. The rejection performance is improved due to the introducing of cascade method in dual-mode filter design. © 2012 IEEE.


Feng Q.,Key Laboratory of Special Display Technology | Feng Q.,Hefei University of Technology | Tong H.,Hefei University of Technology | Lv G.,Key Laboratory of Special Display Technology | Lv G.,Hefei University of Technology
Solid State Phenomena | Year: 2012

The paper proposes a global backlight dimming algorithm for CR enhancement and power reduction. S-shaped function is involved to help improve CR. Both the backlight dimming level and the turning point grayscale of the s-shaped curve are determined by the histogram of the input image. The pixels with the grayscales more than the turning point are compensated to become brighter and the pixels less than turning point become darker. The simulation results show that the proposed dimming algorithm can improve CR by average 34.95% and reduce power consumption by 11.30%.© (2012) Trans Tech Publications, Switzerland.


Feng Q.,Key Laboratory of Special Display Technology | Feng Q.,Hefei University of Technology | Lv G.,Key Laboratory of Special Display Technology | Lv G.,Hefei University of Technology | And 2 more authors.
Advanced Science Letters | Year: 2013

The luminance and static contrast ratio (CR) of the LCDs in aircraft cockpits should be high enough for better safety and security. The images displayed on aircraft cockpit LCDs have 2 distinct characteristics of low average picture level (APL) and high static CR, which makes the common dimming algorithms not so effective. The paper proposes an s-shaped-curve-based global backlight dimming algorithm. The pixels with the grayscales larger than the crossing point of the line y = x become brighter and the pixels less than the crossing point become darker, dramatically enhancing atic CR. The simulation results show the average static CR enhancement is 24.86% and the average power r duction is 7.45%. The prototype is developed and the practical measurement results are the average 19.19% enha of static CR and the average 7.88% reduction of power consumption. © 2013 American Scientific Publishers All rights reserved.


Feng Q.,Key Laboratory of Special Display Technology | Feng Q.,Hefei University of Technology | Lv G.,Key Laboratory of Special Display Technology | Lv G.,Hefei University of Technology | And 2 more authors.
Advanced Science Letters | Year: 2013

The indium-tin oxides (ITO) glasses coating with anti-reflective (AR) films are usually bonding with commercial off-the-shelf LCDs for ruggedization. The rugged LCDs have higher contrast ratio. The display mura also easily happen on the rugged LCDs as the fact that the thermal and mechanical properties of optical adhesive, LC plate, and ITO glass are different. This paper focuses on the stress-induced birefringence of LC cell and try to analyze the possible reasons of the display mura. As the properties of optical adhesive have direct effects on the simulation results, both the practical measurement and the simulation are done for parameter optimization. The simulation model of the rugged LCD with a bubble in the middle of the optical adhesive is established. The simulation results s w that the stress happens on the LC plate when the temperature changes. Even only 5.6% stress changes can ead to the light transmittance decreases from 99% to 5.7%, which should try best to avoid. © 2013 American Scientific Publishers All rights reserved.


Zhang X.T.,Key Laboratory of Special Display Technology | Zhang X.T.,Hefei University of Technology | Liu F.,Key Laboratory of Special Display Technology | Liu F.,Hefei University of Technology | And 2 more authors.
Applied Mechanics and Materials | Year: 2013

Based on the further study on the dynamic dimming algorithms, the Inverse of Mapping Function (IMF) method, the error correction method and the cumulative distribution function (CDF) method are analyzed and applied to get the dimming level in the bottom-lit backlight. 50 typical images are simulated. The power reduction, contrast ratio enhancement, and MSSIM are explored to evaluate the 3 above dimming algorithms, the simulation results show that: IMF method does not apply to the low average luminance images; error correction method is suitable for a wide range of images, but the energy-saving rate is not high; though the energy-saving rate of the CDF method is higher than the other two kinds of algorithms, the image quality has a some kind of distortion. © (2013) Trans Tech Publications, Switzerland.

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