Display apparatus having a shift driving mode and method of testing the same

A display apparatus comprising:

• a display panel configured to display an image, and the display panel including a plurality of gate lines and a plurality of data lines;
• a gate driving part configured to output gate signals to the plurality of gate lines;
• and
• a data driving part comprising a plurality of channels configured to output data signals to the plurality of data lines, and the plurality of channels further configured to shift the data signals by M channel, where M is a positive integer, according to a driving mode selection signal for selecting a driving mode of the display panel,
• wherein the data driving part comprises first to N-th channels, wherein N is an integer greater than M, and the data driving part is configured to output first to N-th data signals of the data signals, and
• the data driving part is further configured to output the first to N-th data signals to first to N-th data lines of the plurality of data lines when the driving mode selection signal is at a first level.

A display apparatus comprising:

• a display panel configured to display an image, and the display panel including a plurality of gate lines and a plurality of data lines;
• a gate driving part configured to output gate signals to the plurality of gate lines;
• and
• a data driving part comprising a plurality of channels configured to output data signals to the plurality of data lines, and the plurality of channels further configured to shift the data signals by M channel, where M is a positive integer, according to a driving mode selection signal for selecting a driving mode of the display panel,
• wherein the data driving part comprises:
• first to N-th channels configured to output first to N-th data signals of the data lines, where N is an integer greater than M;
• and
• normal driving switches disposed on the first to N-th channels, respectively, and configured to connect or disconnect the first to N-th channels.

A method of testing a display apparatus, the method comprising:

• operating a data driving part of a display panel in a normal driving mode in which data signals are output to data lines of the display panel configured to display an image;
• operating the data driving part of the display panel in a shift driving mode in which the data signals are shifted by M channel prior to outputting the data signals, where M is a positive integer;
• and
• determining whether a defect present in the image displayed on the display panel is due to a fault of the display panel or is due to a fault of the data driving part which outputs the data signals to the display panel.

A method for testing a display apparatus, comprising:

• operating a data driver of the display apparatus in a first mode in which data signals are provided to data lines of the display apparatus with a first correspondence;
• determining a first location of a defect displayed in the display apparatus while operating the data driver in the first mode;
• operating the data driver of the display apparatus in a second mode in which the data signals are provided to the data lines of the display apparatus with a second correspondence that is different from the first correspondence;
• determining a second location of the defect displayed in the display apparatus while operating the data driver in the second mode;
• and
• determining whether a fault is present in the data driver or a display panel of the display apparatus based on whether the first location and the second location are identical to each other.