| 摘要 |
A shading correction wave generating unit generates a predetermined shading correction waveform signal including AC signal components on the basis of a scanning drive signal with at least one of horizontal or vertical scanning frequencies for a TV screen. An area-designating signal generating unit generates an area-designating signal to designate a specific area on the TV screen on the basis of said scanning drive signal. A potential clamping unit receives the predetermined shading correction waveform signal including AC signal components and the area-designating signal, and clamps the predetermined shading correction waveform including AC components to a specific potential in the specific area designated by the area-designating signal. An output unit produces a shading correction signal which is the predetermined shading correction waveform signal including AC components as clamped to the specific potential in the specific area by the potential clamping unit.
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