CIRCUIT BOARD, ACTIVE MATRIX SUBSTRATE, DISPLAY DEVICE, AND MANUFACTURING METHOD OF CIRCUIT BOARD

摘要

PROBLEM TO BE SOLVED: To provide a circuit board capable of accurately predicting a quality of an active element such as a TFT element equipped with an oxide semiconductor layer.

SOLUTION: An insulating substrate 2 is provided with a pattern for measuring a trap level 3, comprising: a first electrode 4; a second electrode 6 electrically separated from the first electrode 4; and an oxide semiconductor layer 5 formed so as to have contact with the first electrode 4 and the second electrode 6.

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