Canon Kabushiki Kaisha

Hitachi Displays, Ltd.

Hiroyuki Maru

Tatsuo Furukawa

Masaaki Izumida

Fumio Murooka

Yoshiyuki Imanaka

Yuji Kamiyama

Hiroyuki Ishinaga

Yoshinori Misumi

Junji Shimoda

Masami Kasamoto

Shuichi Katao

Kimiyuki Hayasaki

Kazuaki Masuda

Takashi Yoshida

Teruo Arashima

Jun Kawai

Fujio Kawano

Kazuki Ohta

Masami Ikeda

Toshio Kashino

Seiichiro Karita

Yutaka Koizumi

Shuji Koyama

Akira Goto

Somei Kawasaki

Takayuki Ono

Tsuyoshi Orikasa

Tatsuhito Goden

Masami Iseki

Haruhiko Terai

Kouji Ikeda

Hideaki Kishida

Kouichi Omata

Masaki Inaba

Hiroshi Kageyama

Takanori Yamashita

Osamu Yuki

Takeshi Izumida

The present invention is directed to resolve the noise problem with the ink in an ink jet head without changing the substrate manufacturing process for the ink jet head, that is, increasing the cost on the manufacture, and without needs of disposing a noise countermeasure component on the side of the printer main device, or making the design change for the countermeasure. The present invention is characterized in that to prevent malfunction from arising by the noise, a hysteresis circuit to provide different input data threshold values upon rising and falling is provided on an input portion of the signal for a drive control logic system such as a drive input signal for a shift register and a latch circuit on the same substrate as that of the heating elements, the driver and the drive control logic circuit, utilizing a diffusion layer constituting a driver.

Print head substrate, print head using the same, and printing apparatus

A display apparatus includes data lines, scanning lines arranged to cross the data lines, and pixel circuits aligning along the data lines and the scanning lines, such that one of the pixel circuits corresponds to each intersection between the data lines and the scanning lines. In addition, image signal lines transmit image signals, and switches connect the data lines to the image signal lines so that each of the data lines is connected to one of the image signal lines. The data lines are arranged such that adjacent data lines form a pair of data lines, and adjacent pairs of data lines are spaced apart from each other by two columns of pixel-circuits. Respective data lines of the pair of data lines are connected by the switches to two different image signal lines, and the switches connecting the pair of data lines to corresponding image signal lines are activated simultaneously.

Display apparatus

A display apparatus includes a pixel circuit, a scanning line for supplying a scanning signal to the pixel circuit, a data line for supplying a data signal to the pixel circuit, and a shift register circuit having a number of stages, with every stage outputting the scanning signal to the scanning line. In addition, a first power supply supplies a voltage to the shift register circuit, and a second power supply supplies a voltage to the pixel circuit. After the first power supply is turned on, a constant level signal of either 'H' or 'L' is input into a terminal of the shift register circuit by clocks of the number of stages of the shift register such that every stage of the shift register outputs a same level signal before the second power supply is turned on.

Active matrix type display apparatus

Provided is a display apparatus including multiple light emitting devices, in which each of the light emitting devices includes a reflective layer and a light emitting layer which are stacked, using interference between light directed from the light emitting layer to the reflective layer so as to be reflected by the reflective layer and light directed from the light emitting layer in the direction opposite to the reflective layer, and in which the multiple light emitting devices include a first light emitting device, a second light emitting device having a light emission color different from the first light emitting device, and a third light emitting device having the same emission spectrum as a spectrum in which light emission of the first light emitting device and light emission of the second light emitting device are mixed.

Display apparatus and imaging system using the same

In a display apparatus, a thin film transistor, a planarization film, and at least two light-emitting devices are provided on a substrate, and the light-emitting device at least includes a light-emitting layer and first and second electrodes. At least two first contact holes and at least two second contact holes are provided in the planarization film at a part outside a display region and connect the first electrode to ground wiring and/or power wiring with a resistance lower than that of the first electrode, the distance between the second contact hole and the display region is longer than that between the first contact hole and the display region, and the opening area of the second contact hole is smaller than that of the first contact hole.

A printing head which outputs an output from a sensor device provided for monitoring various condition of a printing head as digital data, and a printing apparatus using the printing head. The output from the device for detecting condition of the printing head, e.g., information indicative of a substrate temperature, a resistance value of an electrothermal transducer, an ON resistance value of a power transistor which drives the electrothermal transducer and the like is digitized on the substrate, and outputted as digital information to the outside. Further, the digital information is outputted by utilizing a clock signal and a latch signal used for transferring print data to the printing head. This does not increase the number of wires and the area of the substrate.

Printing head, head cartridge having printing head, printing apparatus using printing head, and printing head substrate

A pixel modulation apparatus for converting pixel data D composed of Nbits to a pixel data signal composed of one bit. The pixel data D is input into the apparatus at a pixel period T. The apparatus includes a first data conversion unit which converts the pixel data D to pixel data Dexpanded to Nbits (N&#x3e;N) at the period T, a second data conversion unit which converts the pixel data Dto pixel data Dcomposed of N/m bits at a period T/m, a third data conversion unit which inputs n data from among the pixel data Dand pixel data Ddconstituting the pixel data Dbefore having the period T/m to execute logical sum operations a predetermined number (equal to or less than n) of times to convert the n data to pixel data Dcomposed of Nbits, including additional data corresponding to the predetermined number, and a fourth data conversion unit which converts the pixel data Dto the pixel data signal composed of one bit at the period T/m.

Pixel modulation apparatus and method thereof

Power consumed by a resistor connected between a first power supply and a drive control circuit is controlled by a power driving circuit connected to a second power supply. When the value of current that flows into the resistor fluctuates, the value of current output from power driving circuit to a control terminal of the drive control circuit is controlled in such a manner that power consumed is the same as that when the resistance value of the resistor is a set value. As a result, the value of power consumed by the resistor is rendered substantially constant without being influenced by a variation in the resistance value of the driven resistor or by the power supply voltage. If such a drive circuit is used in driving the printhead of a printing apparatus, stabilized drive can be achieved with the minimum margin, power consumption can be suppressed and the lifetime of the printhead can be prolonged.

Drive circuit, printhead and printing apparatus

A printing head which outputs an output from a sensor device provided for monitoring various condition of a printing head as-digital data, and a printing apparatus using the printing head. The output from the device for detecting condition of the printing head, e.g., information indicative of a substrate temperature, a resistance value of an electrothermal transducer, an ON resistance value of a power transistor which drives the electrothermal transducer and the like is digitized on the substrate, and outputted as digital information to the outside. Further, the digital information is outputted by utilizing a clock signal and a latch signal used for transferring print data to the printing head. This does not increase the number of wires and the area of the substrate.

Ink-jet printing head

In a print head of this invention, electricity-to-heat converters and a driver circuit for driving these electricity-to-heat converters in accordance with print data are formed on a single board. The board further includes an input/output interface circuit for receiving print data from an external apparatus, a CPU for controlling a printer apparatus, a ROM, a RAM, an A/D converter, a D/A converter, a timer, and the like, and also includes an external element driver for driving a mechanism portion of the printer apparatus.

Print head and printer apparatus using the same

A printhead and a printing apparatus using the printhead capable of protecting the printhead without causing malfunction in the printhead even if electrical connection between the printing apparatus and the printhead is cut off for some reason. A VDD monitor monitors a voltage supplied via a pad to a cutoff-function added level converter function to perform drive control on a heater The operation of a power transistor to drive the heater is forcefully turned OFF in accordance with the result of monitoring.

Printhead with malfunction prevention function and printing apparatus using it

Substrate for thermal recording head, ink jet recording head using the substrate, recording apparatus with the recording head, and method of driving recording head

A recording head records data by correcting a variation among recording elements without significantly increasing a size of a substrate of the recording head. The recording head includes a plurality of heat generating elements and a circuit for energizing the heat generating elements in accordance with record data to record data. Selection information for selecting one of a plurality of pre-heat pulse signals is non-volatilly stored in a ROM and one of the pre-heat signal pulses applied to an input terminal is selected in accordance with the selection information stored in the ROM to pre-heat the heat generating elements.

Recording head and recording apparatus using the same

An ink jet head includes a plurality of liquid flow paths for ejecting the ink; and a plurality of heat generating resistors for the respective liquid flow paths, the heat generating resistor being independently drivable; wherein adjacent ones of the heat generating resistors are spaced by not more than 8 microns.

Element substrate having connecting wiring between heat generating resistor elements and ink jet recording apparatus

Growing community of inventors

Kawasaki, Japan

Hiroyuki Maru