Multiple-functional and cost-effective liquid-crystal cell parameter measurement system

Gao Wei Chang*, Yu Hsuan Lin, Zong Mu Yeh

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


For years, the technology of TFT-LCDs (thin-film-transistor liquid crystal displays) has grown very rapidly, especially in the market share and technical development of FPD industries. To effectively promote the industry's capacity for the mass production and quality control, it is urgent to design and develop LC cell optical parameter measurement systems. The goal of this paper is to develop a multiple-functional and cost-effective measurement system to lower the manufacturing cost for the industry. The optical parameters includes the pretilt angle, liquid crystal (LC) cell gap (or phase retardation), and twist angle, which highly influence the display quality. In this paper, we first study the past approaches and analyze their measurement performance. Then, a simple and cost-effective method is proposed to achieve the multiple functions. That is, in addition to the precise measurement of the three important optical parameters, the proposed system can measure the voltage-transmittance (V-T) curve. In our approach, the theoretical study, simulation, and experiment are performed to show the feasibility of the system implementation. Finally, the proposed system is developed to automatically measure the LC cell parameters. Experimental results indicate that the proposed measurement system gives a satisfactory result.

Original languageEnglish
Title of host publicationEmerging Liquid Crystal Technologies II
ISBN (Print)081946600X, 9780819466006
Publication statusPublished - 2007
EventEmerging Liquid Crystal Technologies II - San Jose, CA, United States
Duration: 2007 Jan 212007 Jan 24

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherEmerging Liquid Crystal Technologies II
Country/TerritoryUnited States
CitySan Jose, CA


  • Cell gap
  • Liquid crystal displays
  • Phase retardation
  • Pretilt angle
  • Twist angle

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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