High-efficiency integrated polarized backlight system for liquid crystal display

Abstract

We propose a multiwavelength polarized backlight system (BLS) that is based on the stress-induced birefringence and the multilayer subwavelength grating. The polarized BLS requires no prism sheets and no quarter wave plate. Moreover, because of the high extinction ratio, the rear absorbing polarizer of the liquid crystal display panel is not required anymore. The proposed backlight can fully utilize the light, and the intensity at near normal angles is 2.3 times higher than that of a conventional unpolarized light emitting backlight.

Parallel Emergence of Rigidity and Collective Motion in a Family of Simulated Glass-Forming Polymer Fluids

“…This model has notably found applications in both semicrystalline − and GF polymer materials. ,− We suggest that the phenomenology of these materials, and some of the models used extensively to rationalize their mechanical properties under large deformation, can naturally be explained by the existence of the emergence of stiff regions in the GF liquids, which would play the role of effective physical cross-links between the chains, just as local crystallites in semicrystalline polymers have long been suggested to rationalize the effective cross-links in these materials. This physical interpretation of the large deformation properties of both amorphous and crystalline polymer materials in their solid state would naturally imply that the linkages would progressively “melt” upon heating, as evidenced by a vanishing yield strength near their T g , or melting temperatures, respectively. This is exactly the phenomenology commonly observed in amorphous polymer materials in their glass state. ,− A simple model , has been introduced in which dynamic associations are responsible for “cohesive linkages”, a concept hypothesized long ago by Treloar and Vincent .…”

LED polarization conversion and angular shaping module for LCD backlighting

“…A one dimensional butterfly shape optical component is encapsulated onto the LED chip. There is wire grid polarizer [3][4][5] on the top surface of the butterfly shape component, which functions as a reflective polarizer to reflect polarization component parallel to the metal wire while transmitting the perpendicular one. The transmitting polarization component escapes directly from the top central surface of butterfly component.…”

53.4: Highly Polarized Backlight Consisting of an Aperture‐limited Light Guide Plate and a Hybrid Wire‐Grid Polarizer

“…The geometric features of the NWG, like stack orientation, pitch, aspect ratio (AR), and duty cycle (DC), relates directly to its birefringence property denoted mainly by transmission of P polarization (Tp) and transmission of S polarization (Ts) and extinction ratio (Ext.R, defined by the ratio of Tp to Ts). In the edge-lit backlight units, many research works have applied the NWG structure onto the LGP to manipulate the polarization property for the emission light [2,3]. In order to control the angular distribution that determines the total extraction efficiency of P polarization from the NWG and the brightness concentration on the central axis of backlight units as the preferred illumination condition for LC cells the light extraction structure which generally comprises the plurality of micro vgrooves on the surface opposite to the NWG side of the LGP [2][3][4][5] is also required.…”

“…In the edge-lit backlight units, many research works have applied the NWG structure onto the LGP to manipulate the polarization property for the emission light [2,3]. In order to control the angular distribution that determines the total extraction efficiency of P polarization from the NWG and the brightness concentration on the central axis of backlight units as the preferred illumination condition for LC cells the light extraction structure which generally comprises the plurality of micro vgrooves on the surface opposite to the NWG side of the LGP [2][3][4][5] is also required. However, it is difficult to fabricate the LGP with two individual structures at extremely different scales using current tooling arts.…”