Development of Liquid Crystal Layer Thickness and Refractive Index Measurement Methods for Scattering Type Liquid Crystal Displays

Ozols, A.; Mozolevskis, G.; Zalubovskis, R.; Rutkis, M.

doi:10.2478/lpts-2022-0031

Abstract

We report the measuring method of scattering type display liquid crystal layer thickness based on capacitance values suitable for inline production process control. The method is selected for its effectiveness and simplicity over spectroscopic methods as conventional methods for scattering type displays are not applicable. During the method approbation process, a novel diffuser liquid crystal mixture refractive index was determined based on liquid crystal layer thickness measurement data.

References

1. Cousins, J.R., Wilson, S.K., Mottram, N.J., Wilkes, D., Weegels, L.M., & Lin, K. (2018). A model for the formation of mura during the One-Drop-Filling process. In: 25th International Display Workshop, 12–14 December 2018, Nagoya.
Search in Google Scholar Back to article
2. Valykh, S, Sorokin, S., & Chigrinov, V.G. (2015). Inline Quality Control of Liquid Crystal Cells. Journal of Display technology, 11 (12), 1042–1047.10.1109/JDT.2015.2434939
Search in Google Scholar Back to article
3. Zabels, R., Osmanis K., Ozols, A., Narels, M., Gertners, U., Smukulis, R., & Osmanis, I. (2020). Volumetric Technology: Enabling Near-Work Compatible AR Displays. Proc. SPIE 11304, Advances in Display Technologies X, 113040E, 1–9.10.1117/12.2544891
Search in Google Scholar Back to article
4. Bruyneel, F., Smet, H., Vanfleteren, J., & Calster, A. (2001). Method for Measuring the Cell Gap in Liquid-Crystal Displays. Optical Engineering, 40, 259–267.10.1117/1.1337036
Search in Google Scholar Back to article
5. Nitiss, E., Usans, R., & Rutkis, M. (2012). Simple Method for Measuring Bilayer System Optical Parameters. Proc. SPIE, Opt. Micro- Nanometrology IV 8430, 84301C-84301C–11.10.1117/12.922317
Search in Google Scholar Back to article
6. Kao, C., Tsai, S., & Lu, S. (2009). Measuring Cell Gap of Liquid Crystal Displays by Scanning White-Light Tandem Interferometry. Japanese Journal of Applied Physics, 48, 106508.10.1143/JJAP.48.106508
Search in Google Scholar Back to article
7. Li, J., Wen, C., Gauza, S., Lu, R., & Wu, S. (2005). Refractive Indices of Liquid Crystals for Display Applications. Ieee/ Osa Journal of Display Technology, 1 (1), 51–61.10.1109/JDT.2005.853357
Search in Google Scholar Back to article
8. Ding, L., Shih, W., Lin, M., Hu, Y., & Chang, P. (2012). An Analytical Model for Instant Design of an LCD Cell with Photospacers under Gravity and Local Loading. Journal of the Society for Information Display, 20 (3), 148–155.10.1889/JSID20.3.148
Search in Google Scholar Back to article
9. Feng, X., Beev, K., & Bos, P. (2019). Polarization-Independent Fast Optical Shutter with High Transmission. Applied Optics, 58 (17), 4622–4629.10.1364/AO.58.00462231251280
Search in Google Scholar Back to article

Development of Liquid Crystal Layer Thickness and Refractive Index Measurement Methods for Scattering Type Liquid Crystal Displays

Abstract

Paradigm

My account