Let S be a simply connected orthogonal polygon in the plane, and let T be a horizontal (or vertical) segment such that T ′ ∩ S is connected for every translate T ′ of T . If every two points of S see via staircase paths a common translate of T , then there is a translate of T seen via staircase paths by every point of S. That is, some translate of T is a staircase illuminator for S. Clearly the...

We propose to add a functional reflective polarizer (FRP) in the backlight unit to suppress the crosstalk between red, green and blue color filters of a liquid crystal display (LCD) panel. When incorporated with a commercial two-phosphor-converted white light-emitting diode (2pc-WLED), the color gamut of the LCD can be improved from 92% to 115% NTSC standard, which is comparable to the cadmium-...

We design and simulate a polarizing color filter with a sub-wavelength metal-dielectric grating. It manifests several advantages: a large acceptance angle (up to ±50°), high transmittance (74.3%-92.7%), low absorption loss (∼3.3%), and a high extinction ratio. This polarizing color filter can be integrated into a liquid-crystal display (LCD) backlight system to simultaneously recycle the light ...

Abstract Mn 4+ ‐activated CaAl 12 O 19 (CAO: ) is recognized as a promising candidate for red phosphor used in wide color gamut displays. However, the spontaneous self‐reduction of to 2+ occurs charge compensation through ‐Mn substitution Al 3+ ‐Al , lowering quantum efficiency . To suppress self‐reduction, some divalent metal ions, including Ba Sr Cd Zn and Mg are added instead but only small ...

This paper proposes a backlight module which drives multiple cold-cathode fluorescent lamps (CCFLs) with a current mirror technique to equalize the driving current for each lamp. We first adopt a halfbridge parallel-resonant inverter as the main circuit and use a single-input, multiple-output transformer to drive the multi-CCFLs. Next, we introduce current-mirror circuits to create a new curren...

This paper reports the design of a novel aspheric microlens array (AMA) with high fill factor for direct light emitting diode (LED) backlight system. The AMA mold for patterning transformation was fabricated using the processes of glass wet etching, electroplating, photoresist spin coating and heating encapsulated air. Different from the fabrication results by well-known techniques, the propose...

by Michael Keene, Design Engineer Endicott Research Group, Inc. Abstract As LED backlights continue to displace CCFLs in LCDs, display manufacturers have to deal with several important decisions regarding the choice and arrangement of these LEDs and how best to drive them. One major decision is whether to use a large number of low-power LEDs, or a smaller number of mediumto high-power LEDs. The...