Other

Yukimi Saiki

Kazuhiko Yoshizawa

Toshimitsu Watanabe

Masahisa Tsukahara

A high definition display unit which demodulates, decodes, and processes in relation to chroma and displays a television signal in which a PI (picture) signal and an SI (service information) signal are mixed. A changeover switch connected to an image quality adjusting circuit in a video chroma processing circuit is opened or closed according to an on-off signal S showing the superposed period of both signals detected by a decoder . If the above on-off signal S is on, the changeover switch is opened and the adjustment of image quality is disabled. Therefore, SI display never disappears due to the adjustment of image quality, and the quality of an image can be also adjusted according to an ambient status. Other approaches are also disclosed from preventing image quality adjustment of at least portions of a displayed image containing an information image.

High definition display unit and high definition display method

A high definition display unit which demodulates, decodes, and processes in relation to chroma and displays a television signal in which a PI (picture) signal and an SI (service information) signal are mixed. A changeover switch connected to an image quality adjusting circuit in a video chroma processing circuit is opened or closed according to an on-off signal S showing the superposed period of both signals detected by a decoder If the above on-off signal S is on, the changeover switch is opened and the adjustment of image quality is disabled. Therefore, SI display never disappears due to the adjustment of image quality, and the quality of an image can be also adjusted according to an ambient status. Other approaches are also disclosed from preventing image quality adjustment of at least portions of a displayed image containing an information image.

A digital television signal receiver includes a decoder, capable of decoding digital television signals having a plurality of different formats, which outputs video information in which image fields having mutually different numbers of scanning lines appear aperiodically when the decoder decodes a digital television signal having a specific one of the different formats; a display device which displays an image based on the video information output from the decoder; and an image controller which sets respective display start positions for the image fields having mutually different numbers of scanning lines to a same display start position in a vertical direction when the display device displays an image based on the video information output from the decoder when the decoder decodes the digital television signal having the specific format.

Display device also compatible with digital broadcasts

A high definition display unit which demodulates, decodes, and processes in relation to chroma and displays a television signal in which a PI (picture) signal and an SI (service information) signal are mixed. A changeover switch connected to an image quality adjusting circuit in a video chroma processing circuit is opened or closed according to an on-off signal S , showing the superposed period of both signals detected by a decoder . If the above on-off signal S is on, the changeover switch is opened and the adjustment of image quality is disabled. Therefore, SI display never disappears due to the adjustment of image quality, and the quality of an image can be also adjusted according to an ambient status. Other approaches are also disclosed from preventing image quality adjustment of at least portions of a displayed image containing an information image.

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

A display device which displays an image on a cathode-ray tube screen based on video information decoded from a signal-compressed digital broadcast signal. The video information contains fields having a number of scanning lines which may change from field to field, potentially causing vertical jitter in the displayed image. A circuit prevents the vertical jitter by setting a same vertical scanning start position of an electron beam on the screen for all of the fields regardless of the number of scanning lines. The circuit may be a clamp circuit which clamps a vertical ramp waveform; or a control circuit which controls a direct current level of the vertical ramp waveform when the number of scanning lines in a current field is different from a reference number of scanning lines; or an amplitude control circuit which performs feedback control of an amplitude of the vertical ramp waveform.

Growing community of inventors

Tokyo, Japan

Yukimi Saiki