Patent ID: 7400320
Filing Date: 2008-07-15
Classification: G09G,G11C,H03K,H03M

Abstract:
1. A digital-analog converter circuit for converting an n-bit (n is an integer of 2 or more) digital data signal comprising 2 n step select units connected across 2 n reference voltage lines, each step select unit including n serially connected analog switches polarized to match a logic state of each bit of the n-bit digital data signal; wherein one end of each of said step select units is connected to the reference voltage line and the other end of each of said step select units is connected to a column line input to an effective pixel area; wherein the analog switches comprise P-channel MOS transistors and N-channel MOS transistors; and wherein the n-bit digital data signal has a low amplitude equal to a reference voltage minimum less a threshold value of a P-channel MOS transistor and a high amplitude equal to a reference voltage maximum plus a threshold of an N-channel MOS transistor.