Methods and Apparatus for Measurement of Liquid Crystal Cell Parameters
This invention is about three new measuring methods to determine the twist angle and retardation value of any twisted nematic liquid crystal cell. Twist angle of the liquid crystal alignment and the retardation value are important design parameters in determining the optical performance of liquid crystal displays (LCDs). Current measurement methods and commercially available equipment either requires prior knowledge of the twist angles, uses wave-plate compensation, or cannot determine some of the parameters. The new measuring methods make use of monochromatic light source such as laser beam. Values of the twist angle, retardation and twist sense can be obtained by data fitting using data obtained from adjusting only the polarizers and the LC cell orientations, It does not require prior knowledge of the LCD rubbing conditions and no retardation wave-plate is needed. There are three instrument configurations for the measuring method.
1. Simple to implement
2. Do not need prior knowledge of LCD rubbing conditions
3. Do not need retardation wave-plate
4. Inspection can be conducted during and after manufacturing
- Liquid crystal displays (LCDs) in the quality control and inspection of liquid crystal cells during and after manufacturing
Patent Number: CN100383499C
Application Number: CN2001102121A
Inventor: GUO H | DENG S
Priority Date: 15 Nov 2000
Priority Number: CN100383499C
Application Date: 20 Jan 2001
Publication Date: 23 Apr 2008
IPC Current: G01J000100 | G01N002121 | G01N002123 | G02F000113 | G02F0001133 | G02F00011335
Assignee Applicant: The Hong Kong University of Science & Technology
Title: Method and device for measuring parameters of liquid crystal unit | Used for measuring directional axle of liquid crystal unit parameter of method and device
Usefulness: Method and device for measuring parameters of liquid crystal unit | Used for measuring directional axle of liquid crystal unit parameter of method and device
Summary: For measuring parameters of liquid crystal unit.
Novelty: Method and device for measuring parameters of liquid crystal unit involves using single-color light source and regulating the directions of polarizer and LC unit
光学
激光
20 Jan 2001
Chinese 01102121.7
Chinese ZL01102121.7
TTC.PA.204S
香港
