Key Laboratory of Special Display Technology

Laboratory of, China

Key Laboratory of Special Display Technology

Laboratory of, China
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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.


Niu H.-L.,Key Laboratory of Special Display Technology | Niu H.-L.,Hefei University of Technology | Lu H.-B.,Key Laboratory of Special Display Technology | Lu W.-W.,Key Laboratory of Special Display Technology | And 5 more authors.
Guangdian Gongcheng/Opto-Electronic Engineering | Year: 2012

A solid-state volumetric true 3D display consists of a data transmission, image processing module, a high-speed color projection module, a display module and control circuits. The display module contains of light shutters, which display a dark and fuzzy picture due to the brightness decay when lights transmits. In addition, the display has a serious problem of screen flicker owing to the low response time and low refresh rate. This paper exploits a new polymer stabilized cholesteric texture shutter by adding a small amount of ploymer and chrial dopants to liquid crystal. The maximal transmittance is 88% and the response time is lower than one millisecond. When applied in true 3D display, it can display a clear, stabilized and non-flicker picture, completely satisfying the demands of true 3D display.


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.


Zhang L.,Key Laboratory of Special Display Technology | Lv G.Q.,Key Laboratory of Special Display Technology | Liu F.,Key Laboratory of Special Display Technology | Zhang X.T.,Key Laboratory of Special Display Technology
Applied Mechanics and Materials | Year: 2013

Multi-block gray statistics local dimming algorithm is proposed to automatically control the brightness of the backlight for reducing energy consumption and enhancing the image quality. The large blocks are used to determine the value of backlight matrix and small blocks are to determine the image block brightness. With the use of BMA (Blur-mask approach) to blur the backlight brightness matrix and compensate LCD control signal, local dimming function is realized.The simulation results show that: for pictures, the average backlight power consumption is decreased markedly by 19.9% and the contrast ratio is increased by 53%. © (2013) Trans Tech Publications, Switzerland.


Jing C.L.,Key Laboratory of Special Display Technology | Feng Q.B.,Key Laboratory of Special Display Technology | Zhang Y.S.,Key Laboratory of Special Display Technology | Yang G.L.,Key Laboratory of Special Display Technology | And 3 more authors.
Applied Mechanics and Materials | Year: 2014

A solid-state volumetric true 3D display developed by Hefei University of Technology consists of two main components: a high-speed video projector and a stack of liquid crystal shutters. The shutters are based on polymer stabilized cholesteric texture material, presenting different states that can be switched by different voltage. The high-speed video projector includes LED-based light source and tree-chip digital micro-mirror devices modulating RGB lights. A sequence of slices of three-dimensional images are projected into the liquid crystal shutters locating at the proper depth, forming a true 3D image depending on the human vision persistence. The prototype is developed. The measurement results show that the screen brightness can reach 149 nit and no flickers can be perceived. © (2014) Trans Tech Publications, Switzerland.


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.


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.


Lu H.,Key Laboratory of Special Display Technology | Lu H.,Hefei University of Technology | Xu W.,Key Laboratory of Special Display Technology | Xu W.,Hefei University of Technology | And 9 more authors.
Optics Letters | Year: 2014

A multi-stable and electrically switchable cholesteric liquid crystal based on chiral ionic liquid is demonstrated. The cholesteric liquid crystal can be switched among the planar texture, focal conic texture, wide-band reflected state, and fingerprint texture by applying specific electric fields. Each of these four states exists stably for several hours without any obvious change observed at room temperature. The electro-optical properties and driving scheme of the cholesteric liquid crystal are also reported. © 2014 Optical Society of America.

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