Canon Kabushiki Kaisha

Mitsuo Iwayama

Akira Tsuboyama

Kazunori Katakura

Tadashi Mihara

Yoshio Hotta

Osamu Taniguchi

Yutaka Inaba

Hiroyuki Yokomizo

Hiroshi Takabayashi

Makoto Uehara

Atsushi Mizutome

Takashi Yamamoto

Yoshihiro Onitsuka

Hisao Tajima

Yasushi Shioya

Toshiaki Itazawa

Shigeki Yabu

Shigeru Noda

Hidetarou Tsuchiya

A liquid crystal display panel includes a pair of substrates having thereon scanning electrodes and data electrodes so as to form an electrode matrix, and a chiral smectic liquid crystal disposed between the scanning electrodes and data electrodes to form a plurality of smectic layers each including a plurality of liquid crystal molecules. The scanning electrodes and data electrodes are driven to define an effective display region and a frame-like fixed or semi-fixed pattern display region disposed outside the effective display region and extending along at least one side of the display panel. The smectic layers of the chiral smectic liquid crystal are aligned to extend in a direction which is non-parallel with the extension of the frame-like fixed or semi-fixed pattern display region so as to obviate the occurrence of cell thickness irregularity and liquid crystal voids.

Chevron-type liquid crystal device having effective display and pattern

A liquid crystal apparatus includes: a ferroelectric liquid crystal device comprising an electrode matrix including a plurality of scanning lines and a plurality of data lines intersecting with the scanning lines, and a ferroelectric liquid crystal disposed between the scanning lines and data lines, and a driver for sequentially applying a scanning signal to the scanning lines for selecting a particular scanning line, and for applying data signals for the pixels on the selected scanning line to the data lines. Each of the data signals has a plurality of pulses including a pulse in a controlled phase and a pulse in an auxiliary phase, and the scanning signal for the selected scanning line has a compensation pulse for compensating the pulse in the auxiliary phase of a data signal for a pixel on the selected scanning line.

Chiral smectic liquid crystal display and method of selectively driving

A display apparatus includes a display panel having a matrix structure formed by a scan electrode group and a data electrode group, a scan electrode drive unit for operating the scan electrode group, a data electrode drive unit for operating the data electrode group, and a switching unit for switching on/off the electrical connection between a drive voltage generating unit for supplying drive voltage to the drive unit and a power supply source for supplying power to the drive voltage generating unit. Also included is a detection unit for detecting that the switching unit has been switched off, and a control unit for controlling the scan electrode drive unit and data electrode drive unit to apply a display drive signal for causing the display panel to display a desired image according to image information when the switching unit is switched on and to apply, to the scan electrode group and the data electrode group, non-pixel portion control voltage signals for controlling the optical state of liquid crystal in non-pixel portions which are regions except for intersection portions between the scan electrode group and the data electrode group immediately after or after the switching unit has been switched off.

Display apparatus

Liquid crystal apparatus

There is disclosed a liquid crystal display comprising a liquid crystal panel having a pair of boards each formed with an electrode and arranged opposedly, and a liquid crystal disposed between said boards, a heater provided near or adjacent said panel, means for detecting the temperature of said panel, and a control circuit for controlling the amount of heat generated by said heater in accordance with a comparison result between an output of said detecting means and a first set temperature for use when said liquid crystal panel is in a service state, or a second set temperature for use when said liquid crystal panel is in a non-service state.

Liquid crystal display and heater control circuit for use with said

A liquid crystal apparatus comprises: matrix electrodes which are formed by a scanning electrode group and an information electrode group which intersect the scanning electrode group so as to face the scanning electrode group; a ferroelectric liquid crystal which is arranged between those electrode groups and is driven by an electric field applied through the electrode groups; a drive circuit having a scanning side drive circuit for sequentially generating scan selection signals to the scanning electrode group and for generating scan non-selection signals to the scanning electrodes whose scan is not selected and an information side drive circuit for generating information signals to the information electrode group synchronously with the scan selection signal in accordance with the input information; and a control circuit for controlling the drive circuit in a manner such that an interval between two scan selection signals which are continuously applied to the same scanning electrode is set to a predetermined period of time smaller than a full screen scanning period.

A liquid crystal display apparatus is constituted by: a housing; a liquid crystal panel comprising a liquid crystal disposed between a pair of substrates each provided with electrodes, the liquid crystal panel being affixed to the housing; and a backlight for illuminating the liquid crystal panel, detachably affixed to the housing. A light-transmissive plate, such as a diffusion plate, allowing transmission of light from the backlight is further disposed between the liquid crystal panel and the backlight so as to define an almost closed first space in cooperation with the liquid crystal panel, whereby the first space retaina its almost closed state even when the backlight is detached from the housing.

Liquid crystal display apparatus in which a non-transmissive elastic

A display device for displaying an image in accordance with image signal by applying a drive signal to a ferroelectric liquid crystal which holds an optical state even in a zero electric field state from drive means through scan electrodes and information electrodes in accordance with image information stored in image information memory means, comprises change detection means for detecting change in the image information stored in the image information memory means, and drive control means for controlling drive means in accordance with detection result by the change detection means to apply a signal to erase the display, stop the application of the drive signal or resume the application of the drive signal.

Display device

Liquid crystal device

A display apparatus includes a matrix of electrodes formed of scanning electrodes and information electrodes. A scanning device uses a plurality of scanning methods for selecting scanning electrodes and performs the scanning methods according to respective priorities, and a driving device changes driving conditions according to the scanning methods or the priorities thereof.

Display apparatus having both refresh-scan and partial-scan

Since a fluorescent lamp has a very wide temperature distribution, a large temperature non-uniformity also occurs on a display unit backlighted by the lamp. On the liquid crystal display, the ratio of pulses applied the information and scanning electrodes are controlled in accordance with the temperature change, the overcome the above problem. The ratio of a pulse peak value of a compensation phase part of a scanning selection signal to a pulse peak value of an auxiliary phase part of an information signal may be changed according to a change in temperature.

Liquid crystal apparatus with temperature-dependent pulse manipulation

A ferroelectric liquid crystal device is formed by disposing a ferroelectric chiral smectic liquid crystal between a pair of substrates respectively having thereon one and the other of a group of scanning electrodes and a group of data electrodes disposed so as to form an electrode matrix in combination. A liquid crystal apparatus is constituted so as to detect a temperature of the liquid crystal device and insert a pause period corresponding to the detected temperature in a drive waveform for driving the device.

Growing community of inventors

Odawara, Japan

Mitsuo Iwayama