Scanning-line interpolating circuit, scanning-line interpolating method to be used in same circuit, and image display device provided with same circuit

摘要

A scanning-line interpolating circuit (78) is provided which is capable of reducing jaggies on slanting lines and of keeping smoothness of interpolating signals achieved by using slanting lines having multiple angles for interpolation and of suppressing failures in displaying caused by erroneous judgement. When it is judged that there is matching in pixel data between three pixels or more on an upper line and three pixels or more on a lower line,an interpolating angle judging signal (a) is corrected to be another interpolating angle judging signal (n) corresponding to interpo- lation in up-and-down directions and isolated point is removed and another interpolating angle judging signal (p) is output. Interpolating signals (d,..., m) are blended with other interpolating signals corresponding to interpolation in same directions and at different angles and another interpolating signals (dz,..., mz) are produced. One of second interpolating signals (c, dz,..., mz) is selected based on the interpolating angle judging signal (p) and an interpolating signal (x) is produced.