Forschung

Erfindungen

  • A patent (LU102832) entitled „ZEILENANSCHLÜSSE EINES AKTIVE-MATRIX-DISPLAYS“ has been issued in Luxembourg.

  • A patent with the title " Verfahren zur Ansteuerung einer Matrixanzeige sowie Matrixanzeige" has been applied with DPMA (10 2018 130 240.1).

  • Chihao Xu, Maxim Schmidt, Daniel Schäfer: Verfahren und Vorrichtung zum Dimmen einer Flüssigkristallanzeige mit Hintergrundbeleuchtung. DE 102016209222, 2015
  • Martin Riplinger, Michael Krause, Chihao Xu, Alfred Louis: A Local Dimming Method and Device. LU 92598 (Luxemburg) Patent Application, 11/2014
  • Marc Albrecht, Chihao Xu, Andreas Karrenbauer: Method, system and apparatus for power saving backlight. US 20130278641, 03/2013
  • Chihao Xu: Active matrix organic light-emitting diode display device and method for driving the same.
    USPTO Patent Application, 20130141469, 2011
  • Marc Albrecht, Jan Bauer, Tobias Jung, Markus Kreutzer, Chihao Xu: Verfahren und Vorrichtung zum Anzeigen eines kontrastoptimierten Bilds auf einer hintergrundbeleuchteten Anzeige in einem Fahrzeug und betreffendes Computerprogrammprodukt. DPMA Patent Application DE102011101697, 2011
  • Andreas Karrenbauer, Marc Albrecht, Chihao Xu: Method, System and Apparatus for Power Saving Backlight. US 20110063331, 12/2009
  • Andreas Karrenbauer, Marc Albrecht, Chihao Xu: Method, System and Apparatus for Power Saving Backlight. US 20110063201, 09/2009
  • Chihao Xu, Andreas Karrenbauer, Cosmin Codrea: Verfahren und Treiber zum Ansteuern einer Passivmatrix-OLED-Anzeige. DE102008024126, 05/2008
  • Christoph Hitzelsberger,  Marc Albrecht, Chihao Xu: Schaltung zur gleichzeitigen Ansteuerung einer Anordnung gleichartiger Verbraucher. DE102007006438, 02/2007
  • Chihao Xu, Jürgen Wahl, Friedrich Eisenbrand, Andreas Karrenbauer, Kian Min Soh, Christoph Hitzelsberger: Verfahren zur Ansteuerung von Matrixanzeigen.  DE102005063159, 12/2005
  • Jürgen Wahl, Chihao Xu: Verfahren und Schaltung zur Ansteuerung einer Anzeige. DE102005039538, 08/2005

Dissertationen

  • Maxim Schmidt: "Effizienter Local-Dimming Algorithmus und Matrix-Backlight-Designoptimierung für LC Displays zur Steigerung der Energie-Effizienz und der Bildqualität mit Fokus auf automotive-spezifische Anforderungen", 2022
  • Xingtong Jiang: "Modeling of OLED Degradation for Prediction and Compensation of AMOLED Aging Artifacts", 2019
  • Pascal Volkert: "Digital gesteuertes AMOLED-System: Konzeption, Entwicklung und Realisierung", 2017
  • Cosmin Codrea: "State-dependent Charge-controlled Driving Scheme -SQC- A Power Saving Technology for PMOLED Displays",2015
  • Tobias Jung: "Methoden zur Sicherstellung der visuellen Qualität in lokal gedimmten Backlightsystemen", 2014
  • Qiang Fu: "New Driving Schemes of Cholesteric Liquid Crystal Display for High Speed and Uniform Gray-Scale Performance", 2013
  • Marc Albrecht: "Eine universelle Methode zur effizienten Berechnung von Local Dimming LED Backlight", 2011
  • Christoph Hitzelberger: "Low Power Design Methoden für VLSI CMOS Digitalschaltungen", 2008

Veröffentlichungen

2024

  • IDW Sapporo, Japan, "High Resolution Mini-LED Backlight for High Local Dimming Performance", by Ramazan Ayasli

2023

  • SID Information Display, "Impact of Resolution of Image Condensation and Matrix BLU on Power Saving, Contrast Enhancement, and Local Dimming Processor Complexity for Automotive Applications", by Ramazan Ayasli
  • ICDT conference, "Boosting Power Efficiency and Visual Quality of Automotive LCDs by Proprietary Local Dimming Algorith, BLU Design and HMI Adaption", by Prof. Dr. Chihao Xu

2022

  • SID Information Display, " Proposal of a Combined PAM and PWM Driving Scheme for Micro-LED Displays" by Julian Ritter, Prof. Dr. Chihao Xu, Cuili Gai, Chenggong Wang, Junfeg Li
  • International Display Workshop, "LCD Reflection Model for Simulation of Automotive and Mobile Displays under Daylight Condition", by Ramazan Ayasli, Julian Bürner, Maxim Schmidt, Sascha Xu
  • Vehicle Display and Interfaces Symposium, "Impact of appropriate HMI Design and Matrix BLU Resolution on Local Dimming Performance", by Dr. Maxim Schmidt
  • DFF Focus Meeting and Member Assembly, "Automotive LCDs towards High Quality and Low Power", by Ramazan Ayasli

2021

  • IDW, "Proposal of a Combined PAM and PWM Driving Scheme for Micro-LED Displays" by Julian Ritter, Chihao Xu, Cuili Gai, Chenggong Wang, Junfeng Li
  • SID Information Display, "A unified OLED aging model combining three modeling approaches for extending AMOLED lifetime" by Dr. Xingtong Jiang and Prof. Dr. Chihao Xu.
  • Information Display Volume 37, Issue 3, p 37 - 40: Toward "Light-to-Light" Protection of Automotive Camera Monitor Systems by Benjamin Axman, Frank Langner, Chihao Xu, Karlheinz Blankenbach, Mirko Conrad and Jan Bauer

2020

  • Vehicle Display 2020, "Customized Local Dimming Algorithm and BLU for Automotive Application towards Low Power Consumption and High Visual Quality" by Maxim Schmidt, Ramazan Ayasli and Prof. Dr. Chihao Xu.

2019

  • SID-ME Best Student Award:Robust BLU Design by Optimizing LSF Shape for Automotive Applications by Schmidt, M. & Xu, C., SID Mid Europe Chapter 2019, 2019
  • SID Display Week 2019 International Symposium in San Jose: "2400 Nits Edge-Lit LCD Adaptive EOTF for HDR and Brilliant Images" by Michael Grüning, SID 2019 DIGEST, No. 22-3, Page 307 - 310
  • JID Journal of Information Display (5/2019): "Impact of high-resolution matrix backlight on local-dimming performance and its characterization", by Maxim Schmidt and Michael Gruening and Julian Ritter and Andreas Hudak and Chihao Xuhttps://doi.org/10.1080/15980316.2019.1606121
  • A paper about "Neue Ansätze und Methoden für die Fehlermodellierung und -behandlung bei automobilen Videoübertragungstrecken", which was co-authored by Prof. Chihao Xu is presented on Feb. 18th at the 16. Workshop Automotive Software Engineering in Stuttgart, Germany. https://www.informatik.tu-cottbus.de/~helke/ase2019/

2018

  • SID 2018, Information Display 4/2018 "Dynamic Backlights for Automotive LCDs" By: Chihao Xu, Maxim Schmidt, Torsten Lahr and Markus Weber
  • SID 2018 Symposium Digest 49(1), 441-444 "An Electro-optical OLED Model for Prediction and Compensation of AMOLED Aging Artifacts" By: Xingtong Jiang and Chihao Xu
  • IMID 2018 Digest p. 161, Busan, Korea "Image Processing for Enhancing Display Performance By: Chihao Xu, Maxim Schmidt, Michael Grüning, Xingtong Jiang
  • IMID 2018 Digest p. 162, Busan, Korea "Design and Evaluation of High Resolution Matrix Backlight for Excellent Local-Dimming Results and Uniformity of LCDs" By: Maxim Schmidt, Chihao Xu, Michael Grüning, Julian Ritter, Andreas Hudak

2017

  • IDW 2017, Sendai, Japan, December 06-08, 2017 "Efficient Modeling of LED Crosstalk of a Matrix Backlight Unit", p1457-1460 ISSN-L 1883-2490/24/1457 By: Maxim Schmidt, Michael Grüning, Daniel Schäfer, Chihao Xu
  • SID 2017, Symposium, Los Angelos, USA, May 23-26, 2017 Digest of Technical Papers, 2017,  p207-210 "Acquiring longer AMOLED Lifetime with Digital Aging Compensation" By: Chihao Xu, Pascal Volkert, Xingtong Jiang
  • Optimization and Engineering: "A new class of very efficient algorithms for local dimming", January 2017 By: Michael Krause, Martin Riplinger, Alfred K. Louis, Chihao Xu ,International Multidisciplinary Journal to Promote Optimization Theory & Applications in Engineering Sciences ISSN 1389-4420, Springer Verlag, Optim Eng, DOI 10.1007/s11081-017-9350-9

2016

  • IDW/AD16, Fukuoka, Japan, December 7-9, 2016 "Data-Counting Model for Empirical Prediction of OLED Degradatio" OLED 1-3, p651-653 By: Xingtong Jiang, Chihao Xu "Challenges and Methods for Local Dimming of Long-Edge LCD TVs" p1-8 By: Michael Grüning, Maxim Schmidt, Daniel Schäfer, Chihao Xu
  • SID 2016, Symposium, San Francisco, USA, May 24-26, 2016 "Brilliant Images and Saturated Colors for 4K Edge-Lit LED TVs generated by an Efficient Versatile SSC Local Dimming Processor" By: Daniel Schäfer, Chihao Xu
  • Conference AUTOMOTIVE VISUAL & DISPLAY TECHNOLOGIES, EUROPE, Essen, May 10-12, 2016 "Enhancing LCD and OLED performance for automotive application by specific display algorithms"By: Chihao Xu
  • electronic displays Conference 2016, Nuremberg, Germany, February 24-25, 2016 "Adaptive Global Dimming Based on Image Analysis for Power Saving and Preserving Brilliance of Automotive Displays" By: Maxim Schmidt, Chihao Xu, Torsten Lahr, Kai Hohmann

2015

  • Journal of the Society for Information Display, Volume 23, Issue 12, p570–579, December 2015 "Characterization and compensation of OLED aging in a digital AMOLED system" By: Pascal Volkert, Xingtong Jiang, Chihao Xu
  • Computational Optimization and Applications, p1-21, December 2015 "A new local dimming algorithm based on the simplex method" By: Martin Riplinger, Michael Krause, Alfred K. Louis, Chihao Xu
  • EuroDisplay 2015, Het Pand, Ghent, Belgium, September 21-23, 2015 "Preserved Color Gamut and high Color Stability by Local Dimming for LC-Panels" By: Daniel Schäfer, Chihao Xu
  • "Degradation Behavior of Blue OLED" By: Xingtong Jiang, Pascal Volkert and Chihao Xu SID 2015, Symposium, San Jose, USA, June 2-4, 2015 Digest of Technical Papers 1, 2015,  p258-261
  • "Compensation of OLED I-V-Drift for Suppressing Image Sticking in a Digital AMOLED Display Module" By: Pascal Volkert, Chihao Xu Digest of Technical Papers 1, 2015, p1431-1434 "Increased Power Saving by Combining Global and Local Dimming for Edge-LED LCDs" By: Maxim Schmidt, Daniel Schäfer, Chihao Xu
  • electronic displays Conference 2015, Nuremberg, Germany, February 25-26, 2015 "Prototype Achievement and Further Challenges of digitally driven AMOLEDs" By: Pascal Volkert, Chihao Xu
  • "Increasing the Perceived Grey Value Resolution by Combining Frame Rate Control and Error Diffusion to Reduce Visible Artefacts in Local Dimming Applications" By: Jan Bauer, Markus Kreuzer, Tobias Jung, Daniel Schäfer

2014

  •  SID 2014 Symposium, San Diego, USA, June 3-5, 2014 "A Feedback Method for Ensuring Reliable Visual Quality of Locally Dimmed LCDs" By: Daniel Schäfer, Nico Angeli, Chihao Xu
  • Journal of the Society for Information Display, Vol. 20, No. 2, p43-54, May 2014: "Principle and validation of digital driving for active matrix organic light emitting diodes displays" By: Pascal Volkert, Chihao Xu
  • China FPD Conference/ ASID, Shanghai, China, March 19-20, 2014 "Visual Validation of digital driving of AMOLED displays" By: Chihao Xu, Pascal Volkert
  • electronic displays Conference 2014, Nuremberg, Germany, February 26-27, 2014 "Innovative Scene-Cut detection and treatment for locally dimmed LCD's" By: Daniel Schäfer, Tobias Jung, Chihao Xu

2013

  • IDW 2013, The 20th International Display Workshops, Sapporo, Japan, December 4-6, 2013 Invited Talk: "Digital Drive as an Enabling Technology for AMOLED Displays" By: Chihao Xu, Pascal Volkert
  • "Efficient Local Dimming Algorithm for LCDs with Single-Edge LED Backlight" By: Daniel Schäfer, Tobias Jung, Michael Krause, Chihao Xu Proceedings of EuroDisplay 2013, pp. 24-27, London, September 2013
  • "Feasibility Study of Digital Driving for AMOLED Displays" By: Yassen Dobrev, Pascal Volkert, Chihao Xu SID 2013 Symposium, Vancouver, Canada, May 23, 2013
  • "Correlator Improved SSC Local Dimming Algorithm for Homogeneous Backlight Distributions of Edge-Lit LCDs" By: Tobias Jung, Qiang Fu, Chihao Xu, Markus Kreuzer, Jan Bauer China FPD Conference/ ASID 2013, session 1 (OLED), Shanghai, China, March 20, 2013
  • "Digital AMOLED: Method, Results and Discussions" By: Chihao Xu China FPD Conference/ ASID 2013, session 8 (Display System), Shanghai, China, March 21, 2013 "Local Dimming LCD Enhanced by Clipping Suppression for High Image Quality and High Power Saving" By: Chihao Xu
  • Proceedings of Electronic Displays Conference, February 2013, Nuremberg, Germany: "Advantages and Challenges of digital driving AMOLED Displays" By: Yassen Dobrev, Pascal Volkert, Chihao Xu

2012

  • SID Digest 2012, Volume 23, Issue 1, p555-558, Boston, USA: "Generation of Uniform and Multitude Gray Scales on Cholesteric LCD by Using a Fast Low Voltage Driving Scheme" By: Qiang Fu, Chihao Xu
  • Proceedings of China FPD Conference, March 2012, Shanghai, China: "Digital Drive Method for Simple Process and Low power Consumption of AMOLED" By: Chihao Xu
  • Proceedings of Electronic Displays Conference, March 2012, Nuremberg, Germany:  "LCD Local Dimming for Saving Power and Improving Image Quality" By: Prof. Dr. Chihao Xu (Keynote)
  • Proceedings of SID Symposium, p473-476: "Enhanced local pixel compensation with clipping suppression and global luminance preservation" By: Daniel Schäfer, Tobias Jung, Chihao Xu
  • Proceedings of Siggraph Asia: "GPU-Based Local-Dimming for Power Efficient Imaging" By: Chihao XU, Michael Krause, Jan Krüger
  • Proceedings of IMID, Aug. 2012, Daegu, Korea, p475-476: "Digital Driving Method Utilizing Image Decomposition for Nonuniformity. Compensation of AMOLED Displays" By: Yassen Dobrev, Chihao Xu
  • Chihao Xu, Marc Albrecht, Tobias Jung: Kapitel: 4.5.2 "Dimming of LED LCD Backlights" Beitrag zum Buch: "Handbook of Visual Display Technology." Springer-Verlag 2012, Janglin Chen, Wayne Cranton, Mark Fihn (Eds.)

 

2011

  • Proceedings of China Display / Asia Display, p36-41, Nov. 2011, Kunshan, China: "Optimization algorithm for local dimming of edgelit TVs towards high contrast and low power consumption" By: Chihao Xu
  • SID Symposium Digest of Technical Papers, p665-668, May 2011, Los Angeles, USA: "System Architecture and FPGA-Implementation of the SSC Local Dimming Processor for an Edge-Lit Serial TV" By:Tobias Jung, Marc Albrecht, Daniel Schäfer, Chihao Xu
  • SID Symposium Digest of Technical Papers, p1458-1461, May 2011, Los Angeles, USA: "LSF Correlator - An Amending Module for SSC Local DImming Algorithm to increase the Static Contrast of Edge-Lit LCDs" By: Marc Albrecht, Daniel Schäfer, Chihao Xu, Jan Bauer, Markus
  • Proceedings of IDW 2011, p1931, Nagoya, Japan: "Novel Multi-Selection Pattern for Gray Scale Generation of Cholesteric LCD" By: Qiang Fu, Chihao Xu
  • Proceedings of Eurodisplay, 2011, p64, Arcachon, France:  "Novel Dynamic Driving Scheme (DDS) for Cholesteric Liquid Crystal Display with Grayscale Capability" By: Qiang Fu, Christoph Drews, Chihao Xu

2010

  • Proceedings of Electronic Displays Conference, March 2010, Nuremberg, Germany: "Multiplied Power Efficiency of PMOLED through SQC - a driving scheme converting capacative energy into light" By: Michael Buczek, Cosmin Codrea, Chihao Xu
  • Proceedings of Electronic Displays Conference, March 2010, Nuremberg, Germany: "From Grided Direct-Lit to segmented Edge-Lit-adaptive dimming algorithm for saving LCD backlight power" By: Tobias Jung, Marc Albrecht, Chihao Xu
  • SID 2010, Seattle, USA: "Application of the SSC Local Dimming Algorithm for an Edge-Lit TV" By: Marc Albrecht, Tobias Jung, Andreas Karrenbauer, Chihao Xu
  • IEICE Transactions on Electronics, Nov. 2010, Vol. E93-C, No. 11: "Sorted Sector Covering Combined with Image Condensation - An Efficient Method for Local Dimming of Direct-Lit and Edge-Lit LCDs" By: Marc Albrecht, Andreas Karrenbauer, Tobias Jung, Chihao Xu

 

2009

  • Proceedings of IDW, Dez. 2009, Miyazaki, Japan: "Increasing PMOLED Efficiency by Decimating the Charging/Discharging Power Loss" By: Cosmin Codrea, Michael Buczek, Chihao Xu
  • Proceedings of IDW, Dez. 2009, Miyazaki, Japan: "Adaptive Dimming for Edge-Lit LCD using Sorted Sector Covering Method" By: Tobias Jung, Marc Albrecht, Chihao Xu
  • Proceedings of Electronic Displays Conference, March 2009, Nuremberg, Germany: "Innovative addressing scheme to enhance the lifetime of PMOLED dislays" By: Michael Buczek, Cosmin Codrea, Tobias Jung, Jürgen Wahl, Chihao Xu
  • SID Mai 2009, San Antonio, USA: "A Video-Capable Algorithm for Local-Dimming RGB Backlight" By: Marc Albrecht, Andreas Karrenbauer, Chihao Xu
  • IEEE International Integrated Reliability Workshop, S. Lake Tahoe, USA: "Novel STI-based high-voltage PMOS device (>40V) and its electrical and lifetime characterization" By: Qiang Fu, Chiaho Xu
  • IDW, Dez. 2009, Miyazaki, Japan: Sorted Sector Covering Algorithm with condensed Image Data and Soft Clipping Extension for Low-Cost Local Dimming Processor and High Power Saving" By: Marc Albrecht, Chihao Xu

2008

  • Proceedings IDRC Orlando, USA, p286-289: "A clipper-free algorithm for efficient HW-Implementation of local dimming LED-Backlight" By: Marc Albrecht, Andreas Karrenbauer, Chihao Xu
  • Int. Proceedings IDRC, Orlando, USA: "A Power-Efficient Driving Scheme for PM OLED Displays" By: Cosmin Codrea, Chihao Xu
  • Journal of the Society for Informaion Display, Vol. 16, No. 2, p211-219: "Consecutive Multiline Addressing : A Scheme for Addressing PM OLEDs" By: Cosmin Codrea, Andreas Karrenbauer, Kian Min Soh, Chihao Xu
  • Int. Display Workshops, IDW 2008,Proceedings, Niigata, Japan, p1079-1080: "New passive-matrix OLED driver with multi-line addressing scheme" By: U. Vogel, P. König, P. Bunk, J. Amelung, S. Barth, Jürgen Wahl, Chihao Xu

 

2007

  • 6th International Workshop, Rome, Italy, June 2007, p338-351: "Algorithms for longer OLED lifetime." By: Friedrich Eisenbrand, Andreas Karrenbauer, Chihao Xu
  • ESSDERC 2007, 37th European Solid State Device Research Conference 2007, p175-178: "Design and characterization of STI compatible high-voltage NMOS and PMOS devices in standard CMOS process" By: Xiaoliang Han, Chihao Xu
  • Microelectronics Journal Oct. 2007, Vol. 38, Issue 10/11, p1038-1041: "Design and characterization of high-voltage NMOS and PMOS devices in standard 0.25µm CMOS technology" By: Xiaoliang Han, Chihao Xu
  • Int. Symposium SID 2007 Longbeach, USA: "A new addressing scheme for PM OLED Display" By: Chihao Xu, Andreas Karrenbauer, Soh Kian Min, Jürgen Wahl
  • OLEDs Asia 2007, April 2007, Taipeh, Taiwan: "Consecutive Multiline Addressing Increases PM OLED Display’s Resolution and Lifetime" By:Chihao Xu

 

2006

  • Proceedings of SID Mid Europe Chapter Fall Meeting, 2006 “Dependence of OLED Display Degradation on Driving Conditions” By: K.M. Soh, C. Xu, C. Hitzelberger
  • Proceedings of 14th Annual European Symposium on Algorithms, ESA 2006, Zürich, Schweiz, p744-755: "Multiline Addressing by Network Flow" By: Friedrich Eisenbrandt, Andreas Karrenbauer, Martin Skutella, Chihao Xu
  • 8th International Conference on Solid-State & Integrated Circuit Technology Proceedings, p1708-1710: "A Capacitive Step-Down Converter Using a Linear Mode Pre-Regulator for Improved Load Regulation" By: Shao Bin, Yang Yujia, Hong Zhiliang, Dirk Killat, Chihao Xu
  • Chihao Xu: Kapitel: "Smart-Power-Bauelemente" Beitrag zum Buch "Leistungselektronische Bauelemente." Herausgeber: Dierk Schröder, Springer Verlag ISBN: 978-3-540-28728-5

2005

  • Proceedings of SID Eurodisplay, p393-396: "Electrical and optical characterization of PM OLED displays" By: Soh Kian Min, Stefan Klein, Christoph Hitzelberger, Chihao Xu

2004

  • IEEE International Conference on Semiconductor Electronics, p5-5: "Parameter specific supply voltage scaling by evaluating the frequency of an onchip ring-inverter-chain" By: Christoph Hitzelberger, Yiannos Manolil, Chihao Xu