KR930011685A - On-screen color signal automatic conversion circuit on the screen - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color television having an on-screen display function, wherein the Y / color demodulation circuit 10, the cathode ray tube driving circuit 20, the color signal level detecting means 30, the inverting portion 40, the character generator 50 ), OSD generation unit 60, combination and switching means 70, the level of the image signal display color signal output from the Y / color demodulation circuit 10 is detected by the color signal level detection means 30 Here, the detected color signal for displaying the image signal and the on-screen signal displaying color signal having a complementary color relationship are applied to the cathode ray tube driving circuit 20 through the combination and switching means 70.

Therefore, when the video signal and the on-screen signal are displayed on the screen at the same time, the on-screen signal is clearly displayed, and the color of the on-screen signal is automatically converted in accordance with the change of the color signal for displaying the video signal, thereby making it easy to operate without additional operation. The color signal of the on-screen signal is converted and can be converted into various colors.

Description

On-screen color signal automatic conversion circuit on the screen

Since this is an open matter, no full text was included.

1 is a block diagram showing an on-screen color signal automatic conversion circuit of a screen which is an embodiment according to the present invention.

FIG. 2 is a detailed circuit diagram of the switching means of FIG.

Claims (2)

In a television having an on-screen display function in which an input video signal and an on-screen signal are simultaneously displayed on a screen, the levels of the color signals R, G, and B of the video signal output from the Y / color demodulation circuit 10 are detected. A color signal level detecting means 30, an inverting portion 40 for outputting an inverted signal of the signal output from the color signal level detecting means 30, and signals R ', outputted from the inverting portion 40; G ', B') and the blank signal Y 'of the on-screen signal output from the OSD generator 60 are combined to turn on the color signal and the complementary color relationship of the image signal output from the Y / color demodulation circuit 10. A combination and switching means (70) to which a color signal for screen signal display is applied to the cathode ray tube driving circuit (20), and on-screen color signal automatic conversion circuit of the screen. 2. The color signal level detecting means (30) according to claim 1, wherein the color signal level detecting means (30) generates color signals (R, G, B) by the difference component between the two signals from the input color difference signals (RY, GY, BY) and the luminance signal (Y). A matrix unit 31 to be output, an amplifying unit 32 to receive a signal output from the matrix unit 31, and an amplified signal to be output, and a signal to be inputted to receive a signal output from the amplifying unit 32 The low pass filter unit 33, which detects the level of the color signal, and the signal output from the low pass filter unit 33 are compared with a reference voltage set so that the level signals R ', G', and B 'of the color signal are generated. On-screen color signal automatic conversion circuit of the screen consisting of a comparator 34 and the output. ※ Note: The disclosure is based on the initial application.