ERROR DIFFUSION PROCESSING CIRCUIT OF DISPLAY DEVICE

摘要

PURPOSE:To obtain an error diffusion processing circuit of a display device which can process error diffusion and emphasize a profile simultaneously by a level of the detected edge of an image signal. CONSTITUTION:In a device which adds a reproduced error which occurs in the past before an original picture element to an original picture element picture signal which is input to obtain a diffusion output signal and outputs with less bits than an original picture element picture input signal for pseudo-half tone display, an error detection circuit 35 which processes error diffusion and emphasizes an edge simultaneously based on the diffusion output signal is provided to diffuse and process a picture signal which is input and reduce the number of bits further. At the same time, the picture signal is sent to an edge emphasis section 47 and a level judgement section 48 to divide it into multi-stage threshold in accordance with an edge detection level. A target correction luminance line is selected from the data stored previously in a memory 38 by the threshold and is output so that profile emphasis processing is also carried out.