A plurality of data signal lines each of which is connected to at least one pixel circuit in one pixel circuit column and is not connected to the pixel circuits of other pixel circuit columns are provided to one pixel circuit column, and the pixel circuits in the pixel circuit column are connected to any one of the plurality of data signal lines. A transferring means to collect a sample of the acidic CMP slurry;b. Alternatively it uses a software program to provide the compensated dither matrix. The buffer memory is configured to provide temporary storage of the data that is stored in the specific memory cell during the testing of the specific memory cell.