This paper proposes a method of controlling external electrode lamps (EEFLs) for local dimming of liquid crystal displays (LCDs). In the proposed method, each EEFL is divided into four partitions using external electrodes formed on the outer surface of the lamp. The luminance is controlled by varying the duration of ac power applied to the center electrode of each partition. The shape of the ex...

A polarized backlight for LCD illumination is designed and fabricated in which s-polarized light is extracted owing to selective total internal reflection at microstructures in the anisotropic layer. From the measurement, the contrast ratio in normal viewing direction can be as high as 64. Luminous uniformity of higher than 80% is achieved for polarized backlights. Furthermore, 1.6 gain in effi...

The purpose of this study was to evaluate the glaring effect from light-emitting diode (LED) streetlight with two different brands lens (Lens A and Lens B). By using DIALux Evo 70W LED luminaires, same scenarios road lighting designs pole distance 35m heights 10 m on a 7 wide evaluated both lenses. Calculation performed section defined by one side (single row). height, light overhang boom lengt...

Light traveling from a medium with a high refractive index to a low refractive index experiences total refl ection when the incident angle exceeds the critical angle. The case of 100% refl ection is called total internal refl ection (TIR), in which case the light is confi ned within the medium having the higher refractive index. This phenomenon is used in optical transmission fi bers and light ...

Our goal is to realize sea surveillance systems in which an image processor detects intruding objects such as boats in the sea. A difficulty of the sea surveillance systems is to detect moving objects such as boats inhibiting false detection caused by flapping, splashing and shiny surface of the sea. Firstly we pick up factors of false detection in sea surveillance. Secondly we propose a new su...

We consider the backlight calculation of local dimming as an optimization problem. The luminance produced by many LEDs at each pixel considered is calculated which should cover the gray value of each pixel, while the sum of LED currents is to be minimized. For this purpose a specific approach called as “Sorted Sector Covering” (SSC) was developed and is described in this paper. In our pre-proce...