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Title: Optimised electro-optical effects for photoluminescent LCDs
Author: Ahn, S. H.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2002
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The research outlined in this dissertation investigates and improves the optimum condition of the electro-optic characteristics for liquid crystal modulated photoluminescent liquid crystal displays (PLLCDs). In a comparison of TN and STN-PLLCD, the 1st minimum condition of normally black (NB)-TN-PLLCD gives a greater integrated contrast ratio (ICR) over all collimation angles, compared to that of the 2nd minimum NB-TN-PLLCD. The significant drop in the ICR with collimation angles for the 2nd minimum NB-TN-PLLCD would be of no use in PLLCD applications. It was also found to be better than an optimised STN-PLLCD for every collimation angle for both 128 and 64 way multiplexed. In the case of STN-PLLCDs, both the double layer compensated STN (DSTN) and the film compensated STN (FSTN)-PLLCDs, displayed good integrated contrast ratios (ICRs) for low divergence angles (less than 10°). However, an FSTN is preferable when taking into account the cost and weight of the LC shutter. For use in a tiled display, the asymmetric response of an TN LC cell, with respect to the polar angle of incidence, results in a difference in the grey level transmission for the up and down directions, as seen by the viewer. This means that the TN effect is not suitable for use in this architecture. The symmetric response of the normally white (NW)-OCB-PLLCD was seen to be suitable for uniform image for tiled non-telecentric PLLCD displays. However, in tiled displays the collimation angle for off-normal centred beams (11.6°) should have a half-cone angle of less than 10° to achieve a 100:1 ICR.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available