DISPLAY PROCESSOR

PROBLEM TO BE SOLVED: To prevent display data omission and to enable a trailing process on a display unit which has no after-image effect by storing information on an unprocessed radar beam due to an increase in the number of hits and processing it in a next unit time. SOLUTION: A luminance comparing process part 17 compares newly inputted luminance data with data previously written in a buffer memory 19 and writes larger luminance data in the memory 19. Further, a trailing process part 18 subtracts a coefficient from the luminance data outputted from the memory 19 and writes the resulting data in the memory 19 again. The range bin of the beam data written in this memory 19 is extracted and outputted by a range bin extracting process part 20 in every unit time when a coordinate converting process part 14 can process it. Then the data is converted into orthogonal coordinates to expand pixels, and then written in a frame memory 21. A memory 21 having memory constitution corresponding to a display screen sequentially outputs the data to the display unit 22 having no after-image effect to generate a display screen.