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. designated reference resource that may be used from the start to finish of a layout undertaking to assist deciding upon a suitable liquid crystal display addressing strategy for a given software This booklet can be aimed toward layout engineers who're prone to embed liquid crystal display drivers and controllers in lots of platforms together with platforms on chip. Such designers face the problem of constructing the perfect number of an addressing strategy that may serve them with most sensible functionality at minimum fee and complexity. Readers can be in a position to know about a number of equipment to be had for using matrix LCDs and the comparisons on the finish of every bankruptcy will reduction readers to make an educated layout selection. The booklet will tackle a number of the riding ideas regarding LCDs. a result of non-linear reaction of the liquid crystal to exterior voltages, various riding equipment akin to passive and energetic matrix using can be used. The linked theoretical foundation of those using thoughts is brought, and this theoretical research is supplemented through details at the implementation of drivers and controllers to hyperlink the idea to perform. Written through an skilled study scientist with over 30 years in R&D during this box.
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Extra resources for Addressing Techniques of Liquid Crystal Displays
Both Vth and ???? depend mainly on the NLC mixture used in the display. 6 Electro-optic response of the LCD. Liquid Crystal Displays 13 (d) and the magnitude of the applied field. The contrast ratio, viewing angle and the response time can be optimized by controlling the display cell parameters. A large cell thickness (d) is preferred for a good contrast ratio. However, the response time is directly proportional to d2 and therefore a thin cell is better for short response times. 5 μm (first minima).
Hence, a nonlinear character is essential for matrix addressing, that is to multiplex information through data electrodes in a matrix display. For example, an LED is a polarity-dependent device wherein current flowing through the diode depends on the sign of the potential difference across it. Such nonlinearity is adequate to multiplex an array of LEDs. All LEDs in a row (or column) can be selected and addressed by applying voltages such that the LEDs to be ON are forward biased and the rest of the LEDs in a row (or column) are reversed biased, while making sure that all LEDs in remaining rows (or columns) are reversed biased irrespective of the voltage applied to data electrodes so that they do not emit light.
An equivalent circuit of the 2 × 2 matrix shows that the nonselected pixels are in series with the other two half-selected pixels and it is no surprise that these pixels turn ON when the voltage is sufficiently large (greater than 3 times the threshold voltage). Although it is difficult to draw the equivalent circuit for displays with a larger matrix size, we can see that pixels in the row and column that are connected to the voltage source turn ON when the voltage is 2 to 3 times the saturation voltage.