Display driving circuit, operation method thereof, and operation method of optical-based mura inspection device configured to extract information for compensating mura of display panel

A display driving circuit configured to drive a display panel, the display driving circuit comprising:

• a storage circuit configured to store a plurality of thresholds and a reference look-up table generated based on a reference gray level;
• a MURA compensation circuit configured to receive input data from an external device, to decide a gray level period corresponding to the input data from among a plurality of gray level periods, based on the plurality of thresholds, to calculate a final compensation value based on the gray level period and the reference look-up table, and to perform MURA compensation on the input data based on the final compensation value to generate final data;
• a source driver configured to drive a plurality of source lines connected with the display panel;
• and
• a timing controller configured to control the source driver based on the final data.

An operation method of an optical-based MURA inspection device configured to extract information to be used to compensate a MURA of a display panel, the method comprising:

• measuring reference optical information from the display panel, which is controlled based on a reference gray level;
• generating a reference look-up table based on the reference optical information;
• storing the reference look-up table in a display driving circuit configured to control the display panel;
• generating a gray level pattern based on a plurality of gray levels expressible by the display panel;
• measuring supplementary optical information from the display panel, which is controlled based on the gray level pattern;
• deciding a plurality of thresholds for determining a plurality of gray level periods based on the gray level pattern and the supplementary optical information;
• and
• storing the plurality of thresholds in the display driving circuit.