Patent ID: 6441758
Filing Date: 2002-08-27
Classification: G09G,H01L,H03K,H03M

Abstract:
A D/A conversion circuit, comprising:2n gradation voltage lines, one of the 2n gradation voltage lines being selected according to an inputted n-bit (n is an integer not less than 2) digital signal, and a gradation voltage being supplied to an output line from the selected gradation voltage line; a circuit including a first circuit with n P-channel TFTs connected in series to each other and a second circuit with n N-channel TFTs connected in series to each other, the circuit including the first circuit and the second circuit connected in series to each other and being connected in parallel to each of the 2n gradation voltage lines; and a connection portion between the first circuit and the second circuit, the connection portion being connected to the output line, wherein the digital signal performs switching of the n P-channel TFTs and the n N-channel TFTs connected to each of the 2n gradation voltage lines.