Canon Kabushiki Kaisha

Hajime Morimoto

Eiichi Matsuzaki

Toshiyuki Nobutani

Masami Shimakura

Kenichiro Ono

Junichi Tanahashi

Tatsuya Sakashita

Kenzoh Ina

Taketo Hasegawa

Akio Saito

Kenji Inoue

Yuichi Matsumoto

Takashi Yamamoto

Masamichi Ohshima

Nobuharu Ichihashi

Tatsuya Nakajima

The presence/absence of an image information request signal HSYNC output from each of a plurality of display devices is monitored. Based on the monitoring result, image information stored in an image memory of a display controller incorporated in a host computer is distributed to each display device.

Display control system and its control method, switching device, connection device, peripheral device, peripheral device system, and their control method, and computer readable memory

A display control apparatus for a display device capable of performing updating of a display state for a display element subjected to a change in display includes a display data memory for storing display data, a display controller capable of sequentially reading out the display data stored in the memory and transferring the readout display data to the display device at a predetermined period and capable of performing a partial rewrite operation of the display data stored in the memory, and a rewrite detector for detecting an address for accessing the display data memory to cause the display controller to perform the partial rewrite operation. In addition, a transfer permitting unit reads the address detected by the rewrite detector and permits transfer of only the display data of the read address to the display controller.

Display control apparatus

A display control apparatus for a display device, capable of updating a display state for a display element subjected to a change in display updating, includes a display data memory for storing display data, and a display controller capable of sequentially reading out the display data stored in the memory and transferring the readout display data to the display device at a predetermined period and capable of performing a partial rewrite operation of the display data stored in the memory. A rewrite detector detects an address for accessing the display data memory to cause the display controller to perform the partial rewrite operation, a specific pattern rewrite detector detects an address of display data subjected to a rewrite operation of the specific pattern and stored in the display data memory, and a rewrite address generator preferentially transfers the address detected by the specific pattern rewrite detector over the address detected by the rewrite detector, reads out the display data from the display data memory at the transferred address, and transfers the readout data to the display device.

A disturbance of an image in the case where a display format is switched during the display operation is prevented without exerting an adverse influence on the operation of a display apparatus side. The apparatus comprises a display apparatus which has a plurality of display formats by a combination of an effective display region in which a display is performed and a non-display region in which no display is performed and has a memory performance of a display state in which either one of the display formats is selected and the display is executed; a display control apparatus for controlling the display format to be displayed by the display apparatus; means for detecting that the selected display format was changed; means for stopping a transmission request of display information by detecting that the display format was changed; means for measuring a period of time during which the transmission request of the display information is stopped; and means for restarting the transmission request of the display information when a predetermined period of time is measured.

Display control system which prevents transmission of the horizontal

A display control apparatus includes a storage unit for storing display data at each position corresponding to a display screen of a display device, a setting unit for setting a read start position of the display data from the storage unit, and a data supply unit for reading out display data in a predetermined amount from the storage unit on the basis of the read start position set by the setting unit and supplying the readout display data to the display device. The read start position set by the setting unit is set on the basis of the display data stored in the storage unit. A display control method is also disclosed.

Display control apparatus and method therefor

A display control apparatus includes a memory for storing information supplied from a processing apparatus, a detector for detecting a storage portion of the information, a display controller for performing display on a display device on the basis of the information stored in the portion detected by the detector, and a limiting unit for limiting the portion detected by the detector.

Display control apparatus and method therefor capable of limiting an

It can be determined without visually observing the display screen of a display device whether image conversion processing in a conversion circuit for outputting image data to the display device is being performed normally. The conversion circuit extracts data at a position designated from a host apparatus from image data output to the display device, and outputs the extracted data to the host apparatus. In the host apparatus, image data obtained upon normal conversion in the conversion circuit is prepared in advance, and this image data is collated with the data sent from the conversion circuit to determine whether the operation of the conversion circuit is normal.

Display control apparatus, information processing apparatus, and control

An image is displayed in an optimum state in accordance with the state of a display. For this purpose, an FLCD interface mounted in an information processing apparatus and an FLCD for actually displaying an image are connected through a data transfer bus for transferring image data to be displayed and a serial communication line for performing communications between them. When the FLCD detects a change in its own state, this information is supplied to a CPU of the FLCD interface through the serial communication line. An instruction for changing, e.g., the operating mode is also transmitted from the FLCD interface to the FLCD through the serial communication line.

Display control apparatus and method

A high quality display image is displayed on a screen by providing an; image area information generator means (203) for generating image area information for designating an area for displaying binarization image data to be obtained by image processing of image data in the multi-level frame buffer on the screen and the area for displaying binarization image data to be obtained by approximate color conversion, based on a computer software, and a processor for processing the image data based on the image area information.

Display control method and apparatus

A display controller includes a memory for storing data to be displayed on a display, a unit for supplying data to the memory, a first flag group for indicating a line on the display screen of the display corresponding to data supplied by the data supplying unit, a second flag group for indicating a plurality of the first flag groups, a detector for detecting the status of the display, a selector for selecting the first or second flag in accordance with the status of the display detected by the detector, and a display control unit for reading data designated by the first or second flag selected by the selector from the memory, and displaying the data on the display.

Growing community of inventors

Tokyo, Japan

Hajime Morimoto