Chihao Xu

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We consider an optimization problem arising in the design of controllers for OLED displays. Our objective is to minimize amplitude of the electrical current through the diodes which has a direct impact on the lifetime of such a display. Modeling the problem in mathematical terms yields a class of network flow problems where we group the arcs and pay in each(More)
SUMMARY 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(More)
We consider an optimization problem arising in the design of controllers for OLED displays. Our objective is to minimize the amplitude of the electrical current flowing through the diodes, which has a direct impact on the lifetime of such a display. The optimization problem consist of finding a decomposition of an image into subframes with special(More)
In this paper, we present algorithms for the calculation of local dimming LED-Backlight. They assure clipper-free results and can be implemented at low HW-costs. The power saving is in average 38.7% compared to global dimming. For a XGA display 72K (RGB) logic gates are needed to implement this algorithm on chip. 1. Introduction The advantages of(More)
A modeling methodology for behavioral models of Smart Power ICs is presented. These components typically consist of a few hundred to thousand transistors, which can be separated into digital (logic) and analog (electro-thermal) model equations. The preferred simulation tool in the automotive industry is presently SABER (MAST ® language). The resulting(More)
—Design optimization for performance enhancement in analog and mixed signal circuits is a major area of research as technology scaling is moving towards the nanometer scale. This paper presents an approach towards the characterization of mixed signal circuits using a 45nm CMOS Voltage Controlled Oscillator with frequency divider as the base line circuit.(More)
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