51.3: Thin Coatable Birefringent Films and Their Application to VA and IPS Mode LCDs

Abstract

Crysoptix developed a novel approach to manufacturing coatable Thin Birefringence Film (TBF TM ) retarders based on molecular engineering of organic transparent materials .The advanced approach allows adjusting chemical structure of low molecular weight components with printing deposition techniques (including roll-to-roll slot die) to produce the coatable submicron Thin Birefringent Films ( TBF TM ) with the required threedimensional refractive index and retardation. We designed a variety of TBF TM with negative A-plate, negative C-plate, and biaxial retardation functions. We have developed new designs of VA and IPS LCD modes based on experimental value of refractive indices for negative C-type and biaxial TBF TM retarders. Numerical simulation and device prototype testing have shown that application of the TBF TM retarders provides efficient optical compensation of LCD working in both VA and IPS modes.SID 07 DIGEST • 1563 ISSN/007-0966X/07/3802-1563-$1.00 © 2007 SID

29.3: Novel Wide‐View Circular Polarizers Using Negative and Positive AC Plates

“…Since the x-, y-and z-axes of the laboratory frame can be chosen coinciding with A-, B-and C-axes respectively, n A , n B and n C can be easily translated as n x , n y and n z respectively. One can find the detailed classification elsewhere [4]. Moreover, to characterize biaxiality of retarders, here we define NZ value as (n s -n z )/(n s -n f ), where n s and n f are higher and lower in-plane refractive indices respectively.…”

“…Instead, it compensates the viewing angle characteristic of the crossed LPs at the direction of azimuth =45 o , in cooperation with the effective negative C plate mentioned above. figure 4(a), at the direction of =0 o , the point P 0 overlaps the point E. By properly adjusting the retardance of the negative C plate, the point P 3 can locate the symmetric point of P 1 with respect to the S 1 -axis, and the point P 4 can overlap the point P 0 (E) exactly. After that, the negative AC plate does not modulate the polarization state anymore, and finally we can achieve a good dark state at this direction.…”

P‐183: Refraction Control in Optical Films for LCD

“…This problem is well known for the O-type polarizers, and it remains true even for the ideal O-type polarizers with infinite contrast ratio at normal [1]. In order to solve the above mentioned problem one [2,3] or two [4][5][6] biaxial retardation films are used as retarders to suppress the dark-state light leakage of two orthogonally crossed polarizers. Various LCD designs require retardation films with certain set of refraction indices or, in other words, certain biaxiality.…”

“…When dissolved, the molecules are self-assembling in supramolecules (stacks) and forming LLC at certain concentration. Under the action of a shear force during the coating step the stacks of the film are aligned along the coating direction in a plane parallel to the substrate surface [2].…”

P‐179: Modeling and Prototyping of Optically Compensated VA LCD

“…On the basis of cascade crystallization technology [1] we have developed an in-cell applicable double-layer coated film made from biaxial B A -plate ( Figure 1b) and negative C-plate ( Figure 1c). The detailed classification of retarders can be found in [4]. Below we show how the said double-layer retarder performing as an A C -plate can efficiently compensate VA LCDs.…”