Patent ID: 9349340
Filing Date: 2016-05-24
CPC Classification: G09G,H01L,H03K

Claim Text:
1. A thin film transistor substrate, comprising: a first input control thin film transistor that controls an input of a binary logic level from an exterior; a first capacitance element that stores the binary logic level inputted through the first input control thin film transistor; a control circuit that has at least one operation control thin film transistor that is turned on and off based on the binary logic level stored in the first capacitance element, the control circuit determining a binary logic level to be outputted to outside based on a state of the operation control thin film transistor; and an output control thin film transistor that controls an output of the binary logic level determined by the control circuit to outside, wherein each of the first input control thin film transistor, the output control thin film transistor, and the operation control thin film transistor is constituted of an n-type thin film transistor or a p-type thin film transistor, each of which comprises: wherein at least one of said at least one operation control thin film transistor includes, in the channel region, a threshold adjustment impurity that is an impurity of a type that is a same type as that of the channel region, and a concentration of the threshold adjustment impurity is made higher than a concentration of the threshold adjustment impurity in channel regions of other thin film transistors of a same type, such that an absolute value of a threshold voltage of said at least one of said at least one operation control thin film transistor is greater than that of said other thin film transistors of the same type, wherein the control circuit is an inverter circuit that has the n-type thin film transistor and the p-type thin film transistor each provided as the operation control thin film transistor, and an absolute value of a threshold voltage of one of the n-type thin film transistor and the p-type thin film transistor that constitutes the inverter circuit is greater than that of said other thin film transistors of the same type, wherein said other transistors of the same type include one of said first input control thin film transistor and said output control thin film transistor, and wherein one of the first input control thin film transistor and the output control thin film transistor is an n-type thin film transistor, and another is a p-type thin film transistor.