Download e-book for iPad: Advances in Electronics and Electron Physics, Vol. 77 by Peter W. Hawkes (Ed.)

By Peter W. Hawkes (Ed.)

ISBN-10: 0120146770

ISBN-13: 9780120146772

This quantity comprises overview articles masking a vast variety of themes in photograph processing and research. the themes coated contain photo research - which has united and harmonized a bunch of heterogeneous fabric; modern techniques to the Fourier remodel; quantity theoretic transforms, that are rather appealing for discrete, finite signs; using the Wigner distribution - which encodes either spatial and spectral info, for photograph filtering; and functions of the idea that of knowledge strength. those up to date surveys are meant to supply the reader with entry to the newest leads to the tremendous energetic box of photograph technological know-how.

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1985. 5-inch diagonal). Production yield may become a problem in such large-area and high-resolution LCDs because of defective elements. In order to overcome this problem, in the latter panel, a redundancy technique was employed in which two TFTs were provided for each pixel, with one TFT being disconnected by laser beam if it was defective. C. Polycrystalline Si Thin-Film Transistors 1. The physics of poly-Si films were thus comparatively advanced prior to their application to TFT LCDs. Most poly-Si TFTs of the staggered type have fabrication processes and a structure similar to those of MOS transistors fabricated on a Si single-crystal wafer.

The leakage current I, induced by light is determined by the photo-generated carriers created in the channel region, I , = W/Lnqp E/hvz{ 1 - exp( - at)} V , , (13) 28 SHINJI MOROZUMI where Wand L are the channel width and length respectively, n is the quantum efficiency (chargecarriers produced per absorbed photon), q is the unit charge of an electron, p is the mobility of the carriers (one of which is assumed to be mobile), E is the light power, v is the average frequency of the light, z is the carrier lifetime, a is the optical absorption coefficient, t is the thickness of the semiconductor film between source and drain, and V, is the drain voltage relative to the source.

B. Electrical Requirements When driving the liquid-crystal elements with alternating polarity signals, a complete image is scanned at twice the frame frequency. Generally, the human eye can easily detect flicker below 25 Hz, so the minimum frame frequency must be more than 30 Hz. For perfectly symmetrical pixel voltages during the positive and negative fields, a frame frequency of 30 Hz would be acceptable from the point of view of flicker. However, since the usual pixel voltages are not perfectly symmetrical, a frame frequency of more than 30 Hz is generally chosen to avoid any visible flicker.

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Advances in Electronics and Electron Physics, Vol. 77 by Peter W. Hawkes (Ed.)


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