Hitachi, Ltd.

Hitachi Maxell, Limited

Hitachi Consumer Electronics Co., Ltd.

Other

Maxell, Ltd.

Yasutaka Tsuru

Yuya Ogi

Nobuaki Kabuto

Mitsuo Nakajima

Haruki Takata

Kazuhiko Tanaka

Takaaki Matono

Satoshi Ouchi

Hiroshi Aoki

Masato Sugiyama

Yoshiaki Mizuhashi

Mayumi Nagayoshi

Katsunobu Kimura

Kuninori Matsumi

Hirofumi Sakamoto

Toyoshige Ohshika

Takashi Hasegawa

Koichi Hamada

Seiji Murata

Ryo Hasegawa

Kazuo Ishikura

Yasuhiro Hirano

Takeo Hioki

Kenya Kasahara

Kenji Katsumata

Toshinori Murata

Masahiro Ogino

Yuji Yamamoto

Hidenao Kubota

Takanori Eda

Takumi Okamura

Kozo Masuda

Koichi Sudo

Tatsuo Nagata

Naoya Oka

Junichi Satoh

Shoji Kimura

Masahiro Nako

Hiroyuki Kurabayashi

Akihiro Shiraishi

Moriyoshi Akiyama

Masaaki Matsukawa

Takashi Kanehachi

A video transmitting apparatus including: a first register that is set when receiving a CEC (Consumer Electronics Control) message which is transmitted by a video signal source and is reset in response to a leading edge of a predetermined voltage that is supplied from said video signal source; and a second register which reads an EDID (Extended Display Identification Data) of a video displaying apparatus, is set when a decision is made that said video displaying apparatus is a predetermined video displaying apparatus, and is reset when a state where an HPD (Hot Plug Detect) is in a state of low has continued for a predetermined period of time or longer, wherein when both of said first and second registers have been set, a determination is made that said video signal source, said video transmitting apparatus, and said video displaying apparatus have been connected.

Image transfer apparatus with CEC communication function

Image transfer apparatus

A video transmission system, in which a transmission device, a video signal source, and a video reception device are connected with each other via HDMI (High-Definition Multimedia Interface) which transmits uncompressed video signal; the transmission device verifying whether or not the video signal source and the video reception device have a function of transmitting/receiving a message and enabling the function of transmitting/receiving the message between the video signal source and the video reception device when both the video signal source and the video reception device have the function of transmitting/receiving the message; and the function of transmitting/receiving the message between the video signal source and the video reception device being terminated when HPD (Hot Plug Detect) signal indicated by the video reception device is set to 'L' level.

Bi-directional communication method between apparatuses using transmission device

According to our invention, linked operation between a monitor apparatus for displaying images, and a set-top box for transmitting image signals to the monitor apparatus via a required interface, can be achieved properly, even if both units are constructed in casings separate from each other. The monitor apparatus uses a CEC line to transmit a CEC vendor command including at least a code associated with unit information, and the set-top box apparatus transmits the CEC vendor command including at least the code associated with the unit information. Upon receiving the vendor command from the set-top box apparatus, the monitor apparatus switches to the linked operation with the set-top box.

Image display apparatus, monitor apparatus and image processing apparatus

An image display apparatus includes a dimming value determination circuit for determining a dimming value of a backlight based on an input image signal, an image signal compensation circuit for compensating the input image signal supplied to a liquid crystal panel in accordance with the dimming value, and a backlight drive circuit for driving and controlling the backlight in accordance with the dimming value. When the light emitting luminance of the present frame of the backlight increases relative to the light emitting luminance of the previous frame, the backlight drive circuit delays the timing for applying the dimming value of the present frame. This makes it possible to reduce power consumption of the backlight by suppressing deterioration in the image quality in spite of the sharp change in the display image luminance.

Image display apparatus

In a local dimming technology for reducing power consumption of a display device using a backlight as in a liquid crystal display, the backlight is configured by a plurality of independently controllable light sources, an image is divided into areas of the same number as that of the controllable light sources and light emission intensity of the light source is calculated based on a feature value of each area. However, this technology has a problem that when a backlight luminance distribution within each area is not uniform, image quality is deteriorated or a power consumption reduction effect is lowered. In the present invention, the image is divided into areas of the number greater than that of the controllable light sources, and the light emission intensity of each light source is determined based on the feature values of a plurality of areas to reduce the above-described problem.

Image display apparatus having back light with multiple light sources and configured to control luminance for each of a plurality of areas that exceed the number of light sources

An initial light control value calculation section calculates the backlight's initial light control value K0 according to brightness of an inputted image signal for each area. A black area measurement section measures a black area S by obtaining ratio of the number of pixels satisfying Y&#x2266;Y0 (Y: brightness signal level, Y0: black level threshold) in the screen. A minimum light control value output section determines a minimum light control value Kmin based on comparison between the measured black area S and a black area threshold S0 and outputs a maximum value permissible for the light control value as the value Kmin when the black area S is the threshold value S0 or less. An LED control signal calculation section outputs a control signal to LED light sources based on a light control value K1 as the higher one of K0 and Kmin.

Liquid crystal display device and backlight control method

In a liquid-crystal display device including an edge-light-scheme-employed backlight device, it is implemented to reduce its power consumption while maintaining its excellent picture-quality. The present invention is applied to the backlight device with a plurality of edge-light-scheme backlight cells in a matrix-like manner including a LED light-source, and a light-guiding plate for emitting light. The intensity of light from a backlight cell positioned at a screen's peripheral portion is so controlled as to be made lower than the intensity of light from a backlight cell at a central portion. The light intensity of a backlight cell having a LED light-source adjacent to a first edge portion of the illumination surface of the backlight device is so controlled as to be made higher than the light intensity of a backlight cell adjacent to a second edge portion opposed to the first edge portion.

Image display device

An area control section individually sets illumination intensity (light control value) of each backlight cell corresponding to each area of the display screen. A spatial filter corrects the light control values so that spatial distribution of the light control values becomes more moderate between adjoining areas. A black area control section sets the minimum value of the light control value based on a 'black area' in the screen. A power control section corrects the light control values so that power consumption of the backlight does not exceed a limit value. A shading control section corrects the light control values to relatively lower brightness in the peripheral part of the screen compared to the central part of the screen. A micro-controller switches the operations of the above light control value correcting sections according to an image display mode selected by the user.

Liquid crystal display device with backlight

The invention has: a first register that is set when receiving a CEC message which a video signal source reads an EDID of a video transmitting apparatus and issues and is reset in response to a leading edge of 5V that is supplied from the video signal source; and a second register which reads an EDID of a video displaying apparatus, is set when it is decided that the video displaying apparatus is a predetermined video displaying apparatus, and is reset when a state where an HPD is in a state of 'L' has continued for a predetermined period of time or longer. Only when both of the first and second registers have been set, it is determined that a predetermined video signal source, the video transmitting apparatus, and the video displaying apparatus have directly been connected.

An image display device using the area control method for eliminating irregularities as seen from the side and also capable of lowering power consumption. The degree of flatness indicating the image flatness of an image in each image area is calculated, and in areas that are flat the light source luminance is set high in order to lessen irregularities as seen from the side; and in areas that are not flat the irregularities are difficult to perceive as seen from the side so an effect that cuts power consumption is obtained without having to correct the light source luminance.

Display apparatus and control circuit of the same

A technique for flexibly converting the number of frames of a displayed image on the basis of a motion in the image or information of an image signal such as a program genre is provided. An image processing apparatus includes an input unit to which an image signal having a predetermined frame rate is input, an information acquirer for acquiring information concerning the input image signal, and a frame rate converter for converting the frame rate of the input image signal and outputting a resultant signal. The frame rate converter conducts the frame rate conversion of the input image signal on the basis of the information (such as the motion in the image or the program genre) of the input image signal acquired by the information acquirer.

Image processing apparatus

A direct type backlight unit used in a liquid crystal display device is provided which can suppress lowering of luminance at an electrode portion of a linear light source. A reflecting plate is formed on a side wall of a box-shaped reflector close to an end of a linear light source. The reflector reflects light beams from the linear light source to be guided toward a liquid crystal panel. The reflecting plate on the side wall has at least two inclined surfaces. The inclined surfaces may have a stepped shape or a convex ridge shape. According to this arrangement, it is possible to reduce or eliminate decrease of the luminance level at ends of an effective display area of a liquid crystal panel.

Liquid crystal display device comprising reflecting portions for reflecting light beams and focusing them on circumferences of electrode portions of linear light sources

Growing community of inventors

Yokohama, Japan

Yasutaka Tsuru