Sharp Kabushiki Kaisha Corporation

Kohhei Tanaka

Takayuki Nishiyama

Ryo Yonebayashi

Kaoru Yamamoto

Takeshi Noma

Seiichi Uchida

Seiji Kaneko

Yasuyuki Ogawa

Yutaka Takamaru

Shigeyasu Mori

Yasuhiro Sugita

Hidefumi Yoshida

Mitsuhiro Murata

Yosuke Iwata

Tokihiro Yokono

Shinji Yamagishi

Akihito Jinda

Keisuke Yoshida

Tomohiro Kimura

Hiroyuki Ogawa

Youhei Nakanishi

Hiromi Katoh

Kazutoshi Kida

Keiichi Yamamoto

Jean Mugiraneza

Kenshi Tada

Koichi Miyachi

Yasutoshi Tasaka

Hisashi Watanabe

Toshihiro Yanagi

Masaki Fujiwara

Takuya Watanabe

Hiroshi Yoshida

Yasuaki Iwase

Masakazu Shibasaki

Ryuzo Yuki

Masayuki Kanehiro

Hiroshi Matsukizono

Naru Usukura

Shigeto Yoshida

Yoshito Hashimoto

Hiroyuki Ohgami

Tong Lu

Yuhji Yashiro

Masahiro Mitani

Shogo Murashige

Akihiro Oda

Ken Kuboki

Akira Shibazaki

Hiroaki Shigeta

Adnan Heganovic

Noriaki Yamaguchi

Yujiro Takeda

Masayuki Soga

Aya Nakatani

Masahito Sano

Ryohji Yayotani

Noritaka Ajari

A display device includes: a display unit including a plurality of first scan lines, a plurality of second scan lines, a plurality of data lines, and a plurality of pixel circuits; and a drive circuit configured to drive the first scan lines, the second scan lines, and the data lines. Each of the pixel circuits includes: a light-emitting element; a drive transistor configured to control a magnitude of an electric current that flows through the light-emitting element, a first compensation transistor having a control terminal connected to an associated one of the first scan lines; and a second compensation transistor having a control terminal connected to an associated one of the second scan lines. The first and second compensation transistors are connected in series and disposed between a control terminal and a conduction terminal of the drive transistor, the conduction terminal leading to the light-emitting element.

Display device and method of driving display device

A display device includes a display control circuit configured to control a data-side drive circuit and a scanning-side drive circuit such that a drive period and a pause period alternate between one another. The display control circuit, in the pause period, such that voltage of corresponding data signal line is applied to first conduction terminal of drive transistor as bias voltage when light emission control transistor is in an off state and current corresponding to holding voltage of holding capacitor flows through display element when light emission control transistor is in an on state, causes the data-side drive circuit to output the bias voltage and apply the bias voltage to data signal lines and causes the scanning-side drive circuit to stop driving first scanning signal lines and selectively drive second scanning signal lines and selectively make light emission control lines inactive.

Display device and method for driving same

The present application discloses a display device capable of performing favorable display in which flicker is not visually recognized while the power consumption of a scanning-side drive circuit, as well as a data-side drive circuit, can be reduced sufficiently when pause driving is performed. A pixel circuit including emission control transistors M, Min addition to a drive transistor Mincludes a switching element that is turned on based on a voltage of an emission control line Ei to initialize an organic EL element OL when the voltage of the emission control line Ei is at a level for turning off the emission control transistors M, M. For example, in some embodiments, the anode electrode of the organic EL element OL is connected to an initialization voltage line Vini via an N-channel transistor Mserving as the switching element, and the emission control line Ei is connected to the gate terminal of the transistor M. In the pixel circuit, the transistors M, M, M, and the like except for the transistor Mare all P-channel transistors.

Pixel circuit, display device, and drive method therefor

With respect to a display device having an external compensation function, a monitor time can be shortened without increasing the number of wiring lines. A pixel circuit in an i-th row and a j-th column includes an organic EL element (display element), a writing control transistor, a drive transistor, a monitor control transistor, and a holding capacitor. A control terminal of the drive transistor is connected to a data signal line S(j) in the j-th column via the write control transistor. The monitor control transistor includes a first conduction terminal connected to a second conduction terminal of the drive transistor, and a second conduction terminal connected to a data signal line S(j+1) in a (j+1)-th column.

A pixel circuit includes a drive transistor configured to control an amount of current to a light emitting device during an emission phase depending upon a voltage applied to a control terminal of the drive transistor, the drive transistor having a first terminal and a second terminal. During a first phase, an anode of the light emitting device is set to a reference voltage and the first terminal of the drive transistor is set to a fixed data voltage such that the drive transistor is stressed with a fixed source-to-gate voltage to prevent a drift of a threshold voltage in the drive transistor thereby preventing a drift in screen brightness. During a second phase, the anode of the light emitting device is set to the reference voltage and the first terminal of the drive transistor is set to a voltage of the first power supply.

Light emitting device driving circuit and related method

A liquid crystal display device includes an active matrix substrate, a counter substrate, and a liquid crystal layer. The active matrix substrate includes a top gate type oxide semiconductor TFT a plurality of gate wiring lines a plurality of source and an interlayer insulating layer The counter substrate includes a plurality of columnar spacers provided on a second substrate. Each columnar spacer is disposed in an intersecting region where the gate wiring line and the source wiring line intersect. A front face of the active matrix substrate on the liquid crystal layer side includes a plurality of first ridges overlapping the plurality of gate wiring lines and a plurality of second ridges overlapping the plurality of source wiring lines.

Liquid crystal display device

An enhanced pixel circuit for a display device provides separate compensation and data programming phases to permit minimization of the programming time. Variations in voltage supplies are accounted for by isolating the drive transistor from such power supply by using a second drive transistor configured as source follower relative to the first drive transistor. An on bias stress transistor is incorporated that can electrically connect the first drive transistor to the power supply during an on bias stress operation. During such operation, a voltage stress is applied to eliminate hysteresis effects associated with the drive transistor. The on bias stress operation may be performed as part of a refresh operation during which a data voltage is programmed to the pixel circuit, or as part of a low frequency operation during which a previously programming data voltage is maintained which reduces power consumption.

TFT pixel threshold voltage compensation circuit with a source follower

An active matrix substrate of an embodiment of the present invention includes a substrate and a plurality of oxide semiconductor TFTs supported on the substrate. Each oxide semiconductor TFT includes a lower gate electrode provided on the substrate, a gate insulating layer covering the lower gate electrode, an oxide semiconductor layer provided on the gate insulating layer, a source electrode which is in contact with the source contact region of the oxide semiconductor layer, a drain electrode which is in contact with the drain contact region of the oxide semiconductor layer, an insulating layer covering the oxide semiconductor layer, the source electrode and the drain electrode, and an upper gate electrode provided on the insulating layer. When viewed in a normal direction of the substrate, the upper gate electrode does not overlap a first electrode which is one of the source electrode and the drain electrode, and a second electrode which is the other of the source electrode and the drain electrode does not overlap the lower gate electrode.

Active-matrix substrate and display device

A display device includes: an active matrix substrate including pixels arrayed in a matrix shape including rows and columns, and scanning wiring lines extending in a row direction and signal wiring lines extending in a column direction, wherein the active matrix substrate includes, in each of pixels, a TFT, a pixel electrode formed of a transparent conductive material and electrically connected to the TFT, a color filter located between the TFT and the pixel electrode, and a connecting electrode formed of a transparent conductive material and electrically connecting the TFT to the pixel electrode, the color filter includes a first color filter layer provided on the TFT and including a first contact hole, and a second color filter layer provided on the first color filter layer and including a second contact hole, and the first contact hole and the second contact hole do not overlap with each other.

Display device

Provide is a technique that enables to easily arrange driving circuits for driving gate lines within pixels, and to reduce display defects in a vertical stripe pattern. An active matrix substrate includes, in each pixel PIX, a pixel electrode, and a pixel switching elementthat is connected with a gate line, a source line, and the pixel electrode. Driving circuit elementsof driving circuits for driving the gate linesare arranged in a light-shielding area BM in a part of the pixels PIX in a display area. The pixel switching elementsin a row of the pixels in which the driving circuit elementis arranged are provided at non-uniform intervals, and drains of the pixel switching elementsin the same row are on the same side with respect to the source lines to which the pixel switching elementsare connected.

Active matrix substrate and display device including same

Provided is a display device in which variation in white balance is suppressed even if wiring lines are arranged in pixels. The display device includes: gate lines; source linesS; drive elements connected to the gate lines and the source linesS; pixel electrodes connected to the drive elements; and color filters provided corresponding to the pixel electrodes. The pixel electrodes are provided in one-to-one correspondence with subpixels, and a plurality of subpixelsR,G, andB constitute one pixel. The display device further includes wiring lines L provided in a pixel region so as to extend along either the gate lines or the source lines. At least some of the wiring lines L are arranged in pixel aperture regions of the subpixels. The arrangement pitch Pof the wiring lines L is larger than the pixel pitch (3&#xd7;Sa).

Provided is a technique for decreasing the deterioration of the display quality, while reducing electric power consumption. An active matrix substrate includes a plurality of gate lines Gn, Gn+1, a plurality of source lines S, a plurality of pixels PIX that are provided with pixel electrodes, respectively, and pixel switching elementseach of which is connected with the pixel electrode, the gate line, and the source line. The pixel electrodehas a connection portionto which the pixel switching elementis connected. The connection portionextends to an adjacent one of the pixels that is adjacent to the pixel where the pixel electrodeis provided, in a gate line extending direction. A data signal supplied by a source line has a polarity that is opposite to a polarity of a data signal supplied by an source line adjacent to the source line, and that is inverted every vertical period.

An active-matrix display device has a gate driver for driving a plurality of gate bus lines of a display portion in accordance with a multi-phase gate clock signal. The gate driver includes first and second gate drivers disposed to opposite sides of the display portion. Each of the first and second gate drivers includes a plurality of buffer circuits connected to the gate bus lines and a plurality of bistable circuits cascaded together so as to constitute a shift register. Each bistable circuit controls two buffer circuits. The bistable circuits are disposed in an interlaced arrangement between the first and second gate drivers. Each of the two buffer circuits controlled by each bistable circuit includes a boost capacitor, and one of the two buffer circuits includes a transistor for isolating a boost effect.

Scanning signal line drive circuit, display device provided with same, and drive method for scanning signal line

Provided is an active matrix substratein which either a plurality of source lines (data lines)S or a plurality of gate linesG, as constituent elements of the active matrix substrate, are vertical lines extending in the longitudinal direction, and the other are horizontal lines. Among a plurality of pixel control elementsT that are provided in correspondence to a plurality of pixels and are connected with the data lineS and the gate linesG so as to control display of the corresponding pixels, respectively, a part of the pixel control elementsT connected with one same horizontal line are arranged on one side with respect to the respective vertical lines to which the pixel control elements are connected, the side being different from a side on which the other pixel control elements connected with the same horizontal line are arranged. Among a plurality of switching elementsas constituent elements of a gate driver (driving circuit), at least a part of the switching elementsare respectively arranged in areas between adjacent ones of the vertical lines, in each of which areas a distance between adjacent ones of the pixel control elementsT is wider than a distance between other adjacent ones of the pixel control elementsT.

Active matrix substrate, and display panel

The invention provides a technique inhibiting luminance unevenness among pixels. An active matrix substrate has a plurality of pixel electrodes PXB each connected to a corresponding one of gate linesand a corresponding one of source lines. The active matrix substrate includes a common electrodefacing each of the pixel electrodes PXB, and an auxiliary lineconnected to the common electrode. The active matrix substrate further includes a plurality of drive circuits disposed in part of a display region and each configured to drive a corresponding one of the gate lines. The drive circuits are each connected to a control line provided for supply of a drive signal. The drive signal has first potential and second potential lower than the first potential alternately at constant cycles. The control line has a line portionextending substantially in parallel with the gate lines. Between the line portionand a capacitance forming region r where each of the pixel electrodes PXB connected to gate lines() and(+2) switched into an unselected state during potential decrease of the line portionforms capacitance between the pixel electrode PXB and the common electrode, the auxiliary lineis connected with the common electrode

Active matrix substrate and display device including the same

Growing community of inventors

Sakai, Japan

Kohhei Tanaka