By Temkar N. Ruckmongathan
Уникальный источник справочной информации, который может быть использован от начала до конца конструкторского проекта для облегчения выбора подходящей техники ЖК-адресации для данного приложения. distinct reference resource that may be used from the start to finish of a layout venture to assist making a choice on a suitable liquid crystal display addressing approach for a given program This booklet should be geared toward layout engineers who're more likely to embed liquid crystal display drivers and controllers in lots of platforms together with platforms on chip. Such designers face the problem of creating the best selection of an addressing procedure that would serve them with top functionality at minimum expense and complexity. Readers could be capable of know about a variety of tools to be had for using matrix LCDs and the comparisons on the finish of every bankruptcy will relief readers to make an educated layout selection. The publication will handle a number of the riding thoughts regarding LCDs. as a result of the non-linear reaction of the liquid crystal to exterior voltages, assorted using tools equivalent to passive and energetic matrix using can be used. The linked theoretical foundation of those riding recommendations is brought, and this theoretical research is supplemented by means of info at the implementation of drivers and controllers to hyperlink the speculation to perform. Written by way of an skilled learn scientist with over 30 years in R&D during this box.
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Extra info for Addressing Techniques of Liquid Crystal Displays
How does a nonlinear element help in matrix addressing? Nonlinear characteristics are helpful in isolating a pixel from the rest of the pixels in a display, as described in the next section. 1. A voltage applied to a row address line will appear across all pixels that are connected to the address line. Similarly, a voltage applied to a column address line will appear across all pixels in that column. The primary goal of addressing is to activate each pixel selectively without affecting the states of other pixels in a display; this goal is achieved when pixels have a nonlinear electro-optic response.
6) where N is the number of lines multiplexed. Is it possible to achieve a higher selection ratio? The answer lies in the derivation of Bigelow and colleagues (Bigelow, Kashnow, and Stein, 1975). They assumed that the electrooptic response of an LCD is a monotonically increasing function of the RMS voltage in the normal operating range of an LCD. They obtained the condition for achieving the maximum selection ratio shown below. Let +Vr be the select voltage, +Vc be the data voltage for OFF pixels and −Vc be the data voltage for ON pixels.
Hence, the variation of the tilt angle at the mid-plane gives an idea of the steepness in the electro-optic characteristics. The steepness of the electro-optic response increases with the twist angle up to 270◦ and the curve has a negative slope above 270◦ and exhibits bi-stability. 8 STN-LCD with a 270◦ Twist (STN-270) A tilted alignment with a tilt angle of 20–30◦ to the surface of the cell is essential to suppress the formation of two-dimensional striped domains found in the 270◦ twisted cell with planar alignment.