Image signal processing apparatus and display device having the same

A display device comprising:

• a display panel comprising a plurality of pixels;
• a power supply to provide a first power voltage and a second power voltage to the display panel;
• and
• a driving circuit to receive an input data signal and to provide an image data signal to the pixels such that an image is displayed through the pixels, the driving circuit comprising an image signal processing apparatus to cumulate the image data signal provided to the pixels, the image signal processing apparatus comprising:
• an adder to add the input data signal of a present frame to a cumulative data signal of a previous frame to output a cumulative data signal;
• an analyzing block to analyze a processing range of the cumulative data signal;
• a processing block to process the cumulative data signal based on the processing range to output a processed data signal;
• an encoding block to compress the processed data signal to output an encoded data signal;
• a memory to store the encoded data signal and the processing range;
• a decoding block to decode the encoded data signal read out from the memory to output a decoded data signal;
• and
• an inverse processing block to inversely process the decoded data signal based on the processing range to output an output data signal, wherein the output data signal is provided to the adder as the cumulative data signal of the previous frame.

A method of operating an image signal processing apparatus, the method comprising:

• adding an input data signal of a present frame to a cumulative data signal of a previous frame;
• analyzing a processing range of the cumulative data signal;
• processing the cumulative data signal based on the processing range to output a processed data signal;
• compressing the processed data signal to output an encoded data signal;
• decoding the encoded data signal to output a decoded data signal;
• and
• inversely processing the decoded data signal based on the processing range to output an output data signal.