Importance

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Abstract

Since each driving circuit has corresponded to the entire range of signal voltage, the dynamic range is large, it is difficult to constitute it by high Vth transistors, and a circuit having sufficient driving capacity for both input and output of current must be used, leading to increased circuit area and current consumption. To solve the problem, a circuit for driving column lines is divided into two in response to signal voltage with, for example, the common voltage as a reference, and these two column line driving circuits are arranged on the upper and lower sides of the LCD effective screen portion every two columns, and when the output end of the one column line driving circuit is connected to one of two column lines the analog switches are open-close timing controlled so that the output end of the other column line driving circuit is connected to the other of the two column lines.

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First Claim