Samsung Electronics Co., Ltd.

Lg Electronics Inc.

Samsung Electro-mechanics Co., Ltd.

Palo Alto Research Center Inc.

Kye-Si Kwon

Seong-jin Kim

Seung-Joo Shin

Gee-Young Sung

Sang-Il Kim

Mi-jeong Song

Sung-Woong Kim

Keon Kuk

Hyuk Soo Lee

Hyung-Jin Kim

Seog-Soon Baek

Il-kwon Moon

Min-Soo Kim

Ji-Hoon Kim

Tse Nga Ng

Jang-yeon Kwon

Seong-Jin Kim

Se-young Oh

Won-Sik Kim

Tae-Hee Kwak

Wou-sik Kim

Woo-sik Kim

Byung-Hun Kim

Jung-yong Lee

Sang-Man Oh

Sang-Ii Kim

Seung-jo Shin

Seong-Joo Shin

An electroactive polymer structure includes a first flexible electrode, a second flexible electrode, and a polymer dielectric layer with ionic liquid on top of the first electrode including at least two regions. Each region of the polymer dielectric layer includes a different ionic liquid concentration. The polymer dielectric layer is in between the first flexible electrode and the second flexible electrode.

Electroactive polymer structures printed with varying compositions of ions

A method of fabricating black matrices of a color filter. The method includes forming a light-shielding layer of an organic material, which is repulsive to ink, on a transparent substrate, forming the black matrices by patterning the light-shielding layer, and hard-baking the black matrices to maintain a plurality of pores which are formed in the black matrices in the forming of the light-shielding layer.

Method of fabricating black matrices of color filter

A color filter and a fabrication method thereof are provided. In the method, color filter ink that includes wax beads is ejected by an inkjet printing process. A black matrix defining R/G/B pixels is formed on a first surface of a substrate and transparent electrodes are formed on a second surface of the substrate opposite to the first surface at positions corresponding to the R/G/B pixels. The fabricated color filter ink is injected into an inkjet head, and the color filter ink is ejected from the inkjet head into each of the R/G/B pixels. A predetermined voltage is applied between the inkjet head and the transparent electrode such that the ejected color filter ink is precisely injected into each of the R/G/B pixels.

Color filter and fabrication method thereof

A method and apparatus to check an operation of a piezoelectric inkjet head includes a first current detection unit to detect a first current output from a piezoelectric element of the piezoelectric inkjet head when a predetermined voltage is applied, a second current detection unit to detect a second current from a capacitor having a capacitance with the same magnitude as a capacitor component of the piezoelectric element when the voltage is applied to the capacitor, and a third current detection unit to detect a third current corresponding to a difference between the first current and the second current, as the amount of deformation of the piezoelectric element according to the application of the voltage.

Method and apparatus to check piezoelectric inkjet head

A nozzle plate and printhead allowing for control of a deflection direction of ejected droplets using electro-wetting, and methods of operating and manufacturing the same. The nozzle plate has at least one nozzle for ejecting fluid and includes electrode segments disposed along a circumference of the nozzle, an insulating layer disposed on a surface of each electrode segment so as to contact fluid in the nozzle, the insulating layer divided into at least two insulating layer segments corresponding to the electrode segments, and a wire pattern electrically coupled to the electrode segments.

Nozzle plate, printhead having the same and methods of operating and manufacturing the same

A method of manufacturing a color filter forming a black matrix on a substrate, the black matrix defining a plurality of pixels, forming liquid ink layers within the pixels and drying the liquid ink layers, penetrating solvent vapor into surfaces of the dried liquid ink layers to form ink layers have mobile surfaces, and drying the ink layers having the mobile surfaces.

Method of fabricating color filter

A nozzle plate, inkjet printhead with the same and method of manufacturing the same. The nozzle plate includes at least one nozzle and has at least one heater segment disposed adjacent to the nozzle. The heater segment is configured to heat a first fraction of the circumference to a greater degree than a second fraction of the circumference. Heater segments are disposed at intervals around a circumference of the nozzle and are independently operable.

Nozzle plate, inkjet printhead with the same and method of manufacturing the same

A piezoelectric inkjet printhead including a reversible shutter disposed in an ink flow path is disclosed. The inkjet printhead may includes a plurality of ink pressure chambers, a plurality of piezoelectric actuators to provide the plurality of ink pressure chambers with a driving force for ink ejection, an ink manifold to supply the plurality of pressure chambers, a plurality of restrictors disposed in the ink flow path between the manifold and the plurality of pressure chambers, a plurality of ink ejecting nozzles coupled to the plurality of pressure chambers, and a plurality of unidirectional shutters. The shutters may be disposed at respective outlets of the plurality of restrictors and may be adapted to open the restrictor when ink is supplied from the restrictor to the pressure chamber and close the restrictor and restrict or prevent the backflow of ink when ink is ejected from the pressure chamber through the nozzle.

Piezoelectric inkjet printhead having a unidirectional shutter

A method of manufacturing a color filter using an inkjet In the method, a region of the color filter in which a plurality of nozzles are sequentially turned on is a first region, a region of the color filter in which all of the plurality of nozzles are turned on is a second region, and a region of the color filter in which the plurality of nozzles are sequentially turned off is a third region, and when the amount of ink discharged from each nozzle gradually decreases as the number of simultaneously turned-on nozzles increases, the number of ink drops discharged from each of the plurality of nozzles gradually increases in the first region and gradually decreases in the third region to maintain a uniform ink thickness over the entire color filter.

Method of manufacturing color filter using inkjet

An inkjet printhead having a cantilever actuator, the inkjet printhead including a plurality of ink chambers containing ink to be ejected; a manifold containing ink to be supplied to the plurality of ink chambers; a plurality of restrictors supplying ink to the plurality of ink chambers from the manifold; a plurality of nozzles ejecting ink from the plurality of ink chambers; and a plurality of cantilever actuators each installed in each of the plurality of ink chambers and having one fixed end and the other deflectable end, such that pressure for ejection of ink is applied due to the deflection of the other end of the cantilever actuator to the ink inside the ink chamber. The cantilever actuator may be made of a bimorph element, eject ink through the nozzle from the ink chamber, and also prevent backflow of ink from the ink chamber to the restrictor by virtue of the deflection of the other end thereof. Since the cantilever actuator can have a greater displacement and can prevent backflow of ink, the size of the ink chamber needed to eject ink droplets of uniform volume can be reduced, and thus the number of channels per inch (CPI) of the inkjet printhead can be increased.

Inkjet printhead having a cantilever actuator

An image forming apparatus includes an electrostatic latent image forming medium, a charge unit charging the surface of the electrostatic latent image forming medium with a predetermined potential, a toner supply unit (TSU) supplying toner to an electrostatic latent image formed on the surface of the electrostatic latent image forming medium to develop the electrostatic latent image into a toner image, and a transfer unit transferring the toner image to a print medium, the electrostatic latent image forming medium including a transparent frame member, a light source inside the frame member, an optical shutter array including a plurality of optical shutters, and a photoconductive layer on which the electrostatic latent image is formed using light transmitted through the optical shutter array. A diffuser may surround the light source to diffuse light to maintain the intensity of light reaching the optical shutters at a uniform level.

Electrostatic latent image forming medium using optical shutter array and image forming apparatus having the same

An electrostatic latent image forming medium includes a frame, an imaging surface on which an electrostatic latent image is to be formed, the imaging surface being supported by the frame, and an alteration mechanism for altering the electrostatic latent image on the imaging surface, the alteration mechanism being between the frame and the imaging surface. When signals are selectively applied to the alteration mechanism, an electrostatic latent image with a potential different from a potential of its surrounding area is formed on the imaging surface.

Electrostatic latent image forming medium, image forming apparatus including the electrostatic latent image forming medium and method of forming an electrostatic latent image

An optical shutter includes a cell having a transparent panel and a hydrophobic transparent insulation panel which are arranged to face each other, a transparent electrode formed on an outer surface of the hydrophobic transparent insulation panel, and an opaque droplet contained in the cell and contacting an inner surface of the hydrophobic transparent insulation panel, wherein the amount of light transmitted is adjusted by changing a contact angle of the opaque droplet with respect to the hydrophobic transparent insulation panel. The opaque droplet may be hydrophobic or hydrophilic. The contact angle of the opaque droplet may be changed by applying an electric field between the transparent electrode and the opaque droplet.

Optical shutter and light scanning apparatus employing the same

In a reciprocating motor capable of securing a stability of a motor by improving a strength of a magnet frame, preventing breakage of the magnet frame in operation of the motor and preventing an inner stator from rotating and separating from a support frame, the reciprocating motor includes an inner stator locker installed between the inner stator and the support frame and preventing the inner stator from separating from the support frame and a magnet frame having plural support bars formed at regular intervals so as to form a space portion in which the magnet is installed in the circumference direction.

Reciprocating motor

An operation control method of a reciprocating compressor is disclosed in which, in case that a motor is overloaded, an operation frequency is increased to render magnetic fluxes of a magnet and an input current are mutually offset, so that a reciprocating compressor can be stably driven even in case of the overload. For this purpose, while the reciprocating compressor using an inverter is operated at a rated frequency, a current load of the motor is measured and the measured load is compared with a pre-set reference load. Upon comparison, if the measured load is greater than the reference load, it is determined as an overload and the operation frequency is increased by as much as a certain value higher than an oscillation frequency, for performing an overload operation. In order to compensate a stroke reduction generated as the operaiton frequency is increased by as much the certain value, the voltage applied to the motor is increased by as much as a certain level according to the increased operation frequency, thereby performing an overload operation.

Growing community of inventors

Seoul, South Korea

Kye-Si Kwon