| 摘要 |
The invention relates to a color half tone display for giving a specific hue to a designated region while displaying the original image by a transparent display at the designated region in an on-screen display in a television receiver. A circuit for generating signals of respective colors of RGB by synthesizing a brightness component Y of the original image and chrominance components (R-Y), (G-Y), (B-Y) using an adder 12 is provided with a switch element 10 for restricting an input of the chrominance component to the adder 12. When an I signal designates a half tone display region, the switch element 10 is brought into OFF state based on the I signal. The color half tone display is carried out by attenuating an output signal of the adder 12 by an amplifier 14 for respective signals of RGB, thereafter, shifting a direct current level of a component in accordance with a hue to be added in RGB by a DC shift circuit 16. |
