Keywords
Liquid crystal display, color breakup, multi primary, field sequential color, wide color gamut, blue phase liquid crystal (bplc), vertical field switching (vfs), hysteresis free, low voltage, wide viewing angle
Abstract
Low power consumption is a critical requirement for all liquid crystal display (LCD) devices. A field sequential color (FSC) LCD was proposed by using red (R), green (G) and blue (B) LEDs and removing the lossy component of color filters which only transmits ~30% of the incoming white light. Without color filters, FSC LCDs exhibit a ~3X higher optical efficiency and 3X higher resolution density as compared to the conventional color filters-based LCDs. However, color breakup (CBU) is a most disturbing defect that degrades the image quality in FSC displays. CBU can be observed in stationary or moving images. It manifests in FSC LCDs when there is a relative speed between the images and observers’ eyes, and the observer will see the color splitting patterns or rainbow effect at the boundary between two different colors. In Chapter 2, we introduce a five-primary display by adding additional yellow(Y) and cyan(C) colors. From the analysis and simulations, five primaries can provide wide color gamut and meanwhile the white brightness is increased, as compared to the three-primary. Based on the five-primary theorem, we propose a method to reduce CBU of FSC LCDs by using RGBYC LEDs instead of RGB LEDs in the second section. Without increasing the sub-frame rate as three-primary LCDs, we can reduce the CBU by utilizing proper color sequence and weighting ratios. In addition, the color gamut achieves 140% NTSC and the white brightness increases by more than 13%, as compared to the three-primary FSC LCDs. Another strategy to suppress CBU is using higher field frequency, such as 540 Hz or even up to 1000 Hz. However, this approach needs liquid crystals with a very fast response time (
Notes
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Graduation Date
2012
Semester
Fall
Advisor
Wu, Shin-Tson
Degree
Doctor of Philosophy (Ph.D.)
College
College of Optics and Photonics
Department
Optics and Photonics
Degree Program
Optics
Format
application/pdf
Identifier
CFE0004780
URL
http://purl.fcla.edu/fcla/etd/CFE0004780
Language
English
Release Date
June 2013
Length of Campus-only Access
None
Access Status
Doctoral Dissertation (Open Access)
Subjects
Dissertations, Academic -- Optics and Photonics, Optics and Photonics -- Dissertations, Academic
STARS Citation
Cheng, Hui-Chuan, "Vertical Field Switching Blue Phase Liquid Crystals For Field Sequential Color Displays" (2012). Electronic Theses and Dissertations. 2462.
https://stars.library.ucf.edu/etd/2462