Patent ID: 7161636

Claim:
A vertical sharpness adjustment device comprising: a terminal to which a vertical sharpness adjustment control signal is applied by a viewer of a TV receiver; a control circuit to which the vertical sharpness adjustment control signal is applied from the terminal, wherein the control circuit generates a signal to display the degree of vertical sharpness adjustment on a screen of the TV receiver; and a vertical sharpness adjustment circuit which adjusts a degree of vertical sharpness adjustment on a video signal according to the vertical sharpness adjustment control signal from the control circuit, wherein the vertical sharpness adjustment circuit comprises: a video input terminal to which the video signal is applied; a first 1H delay line to delay the video signal by one horizontal period; and a second 1H delay line to delay an output of the first delay line by one horizontal period, and wherein the vertical sharpness adjustment circuit adjusts the degree of vertical sharpness adjustment by adjusting a level of a signal resulting from operations performed on the video signal at the video input terminal, a video signal from the first 1H delay line and a video signal from the second 1H delay line.