Sharp Kabushiki Kaisha Corporation

Ryo Yonebayashi

Takayuki Nishiyama

Kohhei Tanaka

Takeshi Noma

Yosuke Iwata

Hidefumi Yoshida

Mitsuhiro Murata

Kohei Tanaka

Yasuhiro Sugita

Kaoru Yamamoto

Jean Mugiraneza

Tokihiro Yokono

Tomohiro Kimura

Youhei Nakanishi

Shinji Yamagishi

Keiichi Yamamoto

Miho Yamada

Keisuke Yoshida

Kenshi Tada

Adnan Heganovic

Masahito Sano

The present application discloses a current-driven display device employing an internal compensation method capable of achieving high-resolution of the display image while suppressing a reduction in the yield of manufacturing, the deterioration in display quality, an increase in the circuit amount. In a pixel circuit of an organic EL display device, a voltage of the gate terminal of a drive transistor is initialized before the voltage of a data signal line is written into a holding capacitor via the drive transistor in a diode-connected state. At this time, a current flows from the holding capacitor connected to the gate terminal of the drive transistor to an initialization voltage line via a threshold compensation transistor, a second light emission control transistor, and a display element initialization transistor, and the voltage of the gate terminal is initialized. Thus, an initialization transistor provided between the gate terminal and the initialization voltage line in the related art comes to be unnecessary.

Display device and method for driving same

A pixel circuit of a display device includes: a light-emitting element; a drive transistor; a write control transistor having one conductive terminal connected to a data line and a control terminal connected to a scanning line; a first capacitor provided between a control terminal of the drive transistor and a conductive terminal of the drive transistor on the light-emitting element side; a second capacitor provided between another conductive terminal of the write control transistor and the control terminal of the drive transistor; and a mode selection circuit provided in parallel to the second capacitor and configured to cause a short-circuit and an open-circuit between electrodes of the second capacitor in accordance with a voltage of a mode selection line. Accordingly, a display device capable of easily performing gradation control is provided.

Display device and pixel circuit

A display device provided with a light-emitting element layer in which a plurality of light-emitting elements each including a first electrode, a function layer, and a second electrode are formed. An auxiliary electrode is provided on a lower side of an edge cover film covering an edge of the first electrode, a function layer includes a common function layer common to the plurality of light-emitting elements and individual function layers, each of which corresponding to each of the plurality of light-emitting elements, the common function layer includes an upper common function layer provided between the light-emitting layers included in the individual function layers, respectively, and the second electrode, and a film thickness of the auxiliary electrode is greater than a film thickness of the upper common function layer.

Display device for simplifying a process of forming a commin function layer

A display device is implemented that can reduce power consumption over a known example while preventing occurrence of black floating. The voltage value of a low-level power supply voltage ELVSS provided to a pixel circuit is set to a higher value in a pause driving period than in a normal driving period. Upon writing a data voltage, an anode initialization period for initializing an anode voltage of an organic EL element is provided. In this regard, an anode initialization period in the pause driving period is made longer than an anode initialization period in the normal driving period. To implement this, for example, a write frequency of a data voltage is made lower in the pause driving period than in the normal driving period.

In a pixel circuit of a display device in which display luminance is controlled by a holding voltage of the capacitor Cst, a gate terminal of a drive transistor M1 is connected to a source terminal of the drive transistor M1 via a capacitance selection transistor M3 and the holding capacitor Cst and is also connected to the source terminal via only an auxiliary writing capacitor Cwa. During a data writing period Tw, the capacitance selection transistor M3 is turned off, and data voltage is provided from a data signal line Dj to the auxiliary writing capacitor Cwa via a writing control transistor M2. Thereafter, the writing control transistor M2 is turned off, the capacitance selection transistor M3 is turned on, so that charges are redistributed between the auxiliary writing capacitor Cwa and the holding capacitor Cst, whereby a driving holding voltage is determined.

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.

To make a frame size of a display device having an external compensation function smaller than those of the known display devices. Each of a plurality of unit circuits configuring a gate driver includes a first output control transistor including a second conduction terminal connected to a first output terminal-connected to another unit circuit and a control terminal connected to a first internal node, a second output control transistor including a second conduction terminal connected to a second output terminal configured to output an on level signal for at least a part of a monitoring period and a control terminal connected to a second internal node, and an output circuit control transistor including a first conduction terminal connected to the first internal node and a second conduction terminal connected to the second internal node. A potential to be applied to a control terminal of the output circuit control transistor is switched between a potential of a high level and a potential of a low level.

Display device

A display device includes: a display region; and a frame region disposed around the display region. The frame region partly includes a terminal section, wherein the frame region includes a main-power-source-voltage stem wire and an auxiliary-power-source-voltage stem wire. The frame region includes a first frame region having the terminal section, and a second frame region located opposite the first frame region with reference to the display region. The main-power-source-voltage stem wire has a potential different from a potential of the auxiliary-power-source-voltage stem wire, and the main-power-source-voltage stem wire and the auxiliary-power-source-voltage stem wire are electrically connected together.

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

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

A technique is provided that reduces dullness of a potential provided to a line such as gate line on an active-matrix substrate to enable driving the line at high speed and, at the same time, reduces the size of the picture frame region. On an active-matrix substrate () are provided gate lines (G) and source lines. On the active-matrix substrate () are further provided: gate drivers () each including a plurality of switching elements, at least one of which is located in a pixel region, for supplying a scan signal to a gate line (G); and lines (L) each for supplying a control signal to the associated gate driver (). A control signal is supplied by a display control circuit () located outside the display region to the gate drivers () via the lines (L). In response to a control signal supplied, each gate driver () drives the gate line (G) to which it is connected.

Active-matrix substrate, display panel and display device including the 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.

Liquid crystal display device

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

Proximity of a coil is recognized without increasing a material cost or a manufacturing cost. Provided is a touch panel () that includes a plurality of drive electrodes () that are formed in a drive layer () and a plurality of touch sense electrodes () that are formed in a sense layer (), in which a proximity sense electrode () by which proximity of a coil is detected is formed in the sense layer ().

Growing community of inventors

Sakai, Japan

Ryo Yonebayashi