Display device inspecting apparatus and method

A method of inspecting a flexural strength of a glass including a folding area of a display apparatus, the method comprising:

• a sample glass surface measurement operation of measuring a three-dimensional shape of a surface of each of a plurality of sample glasses;
• a sample glass curvature variable calculation operation of calculating a plurality of curvature variables of the each of the plurality of sample glasses based on an information measured in the sample glass surface measurement operation;
• a sample glass flexural strength measurement operation of measuring a flexural strength of the each of the plurality of sample glasses;
• a data analysis operation comprising a relational expression generation operation of generating a relational expression between the plurality of curvature variables and the flexural strength;
• and
• a flexural strength prediction operation of predicting a flexural strength of a target glass based on the relational expression,
• wherein the flexural strength prediction operation comprises:
• a target glass surface measurement operation of measuring a three-dimensional shape of a surface of the target glass;
• a target glass curvature variable calculation operation of calculating a plurality of curvature variables of the target glass based on an information measured in the target glass surface measurement operation;
• and
• a target glass flexural strength calculation operation of calculating the flexural strength of the target glass by inputting the plurality of curvature variables calculated in the target glass curvature variable calculation operation in the relational expression.