Image display apparatus, and method to prevent or limit user adjustment of displayed image quality

An image display apparatus comprising:

• a display means for selectably displaying at least two of:
• a picture image without an information image;
• said information image without said picture image;
• and said picture image simultaneously with said information image;
• a detection means for detecting a portion of said displayed image containing said information image and outputting a control signal according to said detected portion;
• a user adjustment control means for allowing user adjustment of an image quality of a displayed image;
• and
• an enabler/disabler means for selectively preventing said user adjustment control means from adjusting at least said portions of said displayed image containing said information image based on said control signal.

An image display method comprising the steps of:

• providing a display circuit adapted to selectably display at least two of:
• a picture image without an information image;
• said information image without said picture image;
• and said picture image simultaneously with said information image;
• detecting a portion of said displayed image containing said information image;
• outputting a control signal according to said detected portion;
• allowing, via a user adjustment control circuit, user adjustment of an image quality of a displayed image;
• and
• selectively preventing said user adjustment control circuit from adjusting at least said portions of said displayed image containing said information image based on said control signal.

A high definition display unit, comprising:

• a tuner for inputting a television signal having both an information signal and a picture signal;
• a digital demodulator for demodulating an output of said tuner;
• a digital decoder for decoding an output of said digital demodulator and outputting an analog signal including an information image superposed on a picture image;
• a video chroma processor for receiving said analog signal, and having an image quality adjusting circuit;
• an output device for outputting a display signal based upon an output from said video chroma processor;
• a display for displaying an image according to said display signal;
• and
• a detector for detecting a period of said superposed information signal and picture signal, wherein:
• said image quality adjusting circuit is disabled according to said display signal so said information signal is not degraded by image quality adjustment.

A high definition display unit, comprising:

• a tuner for inputting a mixed television signal in which a picture information signal is superposed on a picture image signal;
• a digital demodulator for demodulating an output of said tuner;
• a digital decoder for decoding an output of said digital demodulator and outputting it as an analog signal;
• a video chroma processor for receiving said analog signal, and having an analog output processing circuit and an image quality adjusting circuit to produce a video chroma processing signal;
• an output device for outputting a display signal based upon said video chroma processing signal;
• a display for displaying an image according to said display signal;
• a section for separating said picture information signal and a bypass circuit of said separated picture information signal are provided to said video chroma processor;
• and
• a detector for detecting a period of said superposed picture information image and picture image signal, and outputting a control signal according to said detected period, wherein:
• said bypass circuit is operated according to said control signal so said picture information signal is not degraded by an image quality adjustment.

A high definition display unit, comprising:

• a tuner for inputting a mixed television signal in which a picture information signal is superposed on a picture image signal;
• a digital demodulator for demodulating an output of said tuner;
• a digital decoder for decoding an output of said digital demodulator and outputting it as an analog signal;
• a video chroma processor for receiving said analog signal, and having an analog output processing circuit and an image quality adjusting circuit for generating a video chroma processing signal;
• an output device for outputting a display signal based upon said video chroma processing signal;
• a display for displaying an image according to said display signal;
• and
• a detector for detecting a brightness of said image and outputting a signal based on the brightness detected, wherein:
• said digital decoder detects a period of said superposed picture information signal and picture image signal;
• and
• for said detected period, said image quality adjusting circuit is operated according to said signal from said detector for detecting said brightness so said picture information signal is not degraded by an image quality adjustment.

A high definition display unit, comprising:

• a tuner for inputting a mixed television signal in which a picture information signal is superposed on a picture image signal;
• a digital demodulator for demodulating an output of said tuner;
• a digital decoder for decoding an output of said digital demodulator and outputting it as an analog signal;
• a video chroma processor for receiving said analog signal and having an analog output processing circuit and an image quality adjusting circuit to produce a video chroma processing signal;
• an output device for outputting a display signal based upon said video chroma processing signal;
• a display for displaying an image according to said display signal;
• and
• a detector for detecting a period of said superposed picture information signal and picture image signal, wherein:
• for said detected period, said image quality adjusting circuit is disabled, and an operating point of said output device is adjusted so said picture information signal is not degraded by an image quality adjustment.

A high definition display unit, comprising:

• a tuner for processing a mixed television signal in which a picture information signal is superposed on a picture image signal;
• a digital demodulator for demodulating an output of said tuner;
• a digital decoder for decoding an output of said digital demodulator and outputting it as an analog signal;
• a video chroma processor for receiving said analog signal, and having an analog output processing circuit and an image quality adjusting circuit for producing a video chroma processing signal;
• an output device for outputting a display signal based upon said video chroma processing signal;
• a display for displaying an image according to said display signal;
• and
• a detector for detecting a period of said superposed picture information signal and picture image signal, and for producing a detection signal, wherein:
• said adjustment range limiting circuit is operated according to said detection signal;
• and
• an adjustment range limiting circuit of said image quality adjusting circuit is provided.

A high definition signal processing method, comprising the steps of:

• inputting a mixed television signal, in which a picture information signal is superposed on a picture image signal, into a tuner;
• demodulating an output of said tuner by a digital demodulator;
• decoding an output of said digital demodulator by a digital decoder, and processing a decoded output of said digital decoder as an analog signal;
• processing said analog signal and adjusting an image quality thereof by a video chroma processor to produce a video chroma processing signal;
• outputting a display signal based upon said video chroma processing signal by an output device to a display;
• displaying an image on said display according to said display signal;
• detecting a period of said superposed picture information signal and picture image signal;
• and
• disabling said adjustment of image quality according to said detected period.

A high definition signal processing method, comprising the steps of:

• inputting a mixed television signal, in which a picture information signal is superposed on a picture image signal, into a tuner;
• demodulating an output of said tuner by a digital demodulator;
• decoding an output of said digital demodulator by a digital decoder, and processing a decoded output of said digital decoder as an analog signal;
• processing said analog signal and adjusting an image quality thereof by a video chroma processor to produce a video chroma processing signal;
• outputting a display signal based upon said video chroma processing signal by an output device to a display;
• displaying an image on said display according to said display signal;
• detecting a period of said superposed picture information signal and picture image signal;
• separating said picture information signal from said picture image signal by said video chroma processor for said detected period;
• and
• bypassing said image quality adjustment of said separated picture information signal to avoid image quality adjustment by said video chroma processing signal.

A high definition signal processing method, comprising the steps of:

• inputting a mixed television signal, in which a picture information signal is superposed on a picture image signal, into a tuner;
• demodulating an output of said tuner by a digital demodulator;
• decoding an output of said digital demodulator by a digital decoder, and processing a decoded output of said decoder as an analog signal;
• processing said analog signal and adjusting an image quality thereof by a video chroma processor to produce a video chroma processing signal;
• outputting a display signal based upon said video chroma processing signal by an output device;
• displaying an image on a display according to said display signal;
• detecting a brightness of said image to produce a brightness detection signal;
• detecting a period of said superposed picture information signal and picture image signal;
• and
• adjusting, for said detected period, said image quality according to said brightness detection signal.

A high definition signal processing method, comprising the steps of:

• inputting a mixed television signal, in which a picture information signal is superposed on a picture image signal, into a tuner;
• demodulating an output of said tuner by a digital demodulator;
• decoding an output of said digital demodulator by a digital decoder, and processing said decoded output as an analog signal;
• processing said analog signal and adjusting an image quality thereof by a video chroma processor to produce a video chroma processing signal;
• outputting a display signal based upon said video chroma processing signal by an output device;
• displaying an image on a display according to said display signal;
• detecting a period of said superposed picture information signal and said picture image signal;
• and
• for said detected period, an operating point of said output device is adjusted without adjusting said image quality.

A high definition signal processing method, comprising the steps of:

• inputting a mixed television signal, in which a picture information signal is superposed on a picture image signal, into a tuner;
• demodulating an output of said tuner by a digital demodulator;
• decoding an output of said digital demodulator by a digital decoder, and processing said decoded output as an analog signal;
• processing said analog signal and adjusting an image quality thereof by a video chroma processor to produce a video chroma processing signal;
• outputting a display signal based upon said video chroma processing signal by an output device;
• displaying an image is on a display according to said display signal;
• limiting an image quality adjustment range;
• detecting a period of said superposed picture information signal and picture image signal to produce a detection signal;
• and
• said image quality adjustment range is limited according to said detection signal.