Patent application number | Description | Published |
20080211800 | DISPLAY DEVICE - A display device is driven through no wire cable such as an FPC, and a display image is continuously held for a certain period of time by storing an image signal received from a wireless communication device so that the display image can be held even when the display device is out of communication range with the wireless communication device. A display device includes at least a pixel circuit having an SRAM (static random access memory) circuit, a circuit which controls the pixel circuit, an antenna circuit, a circuit which generates a demodulation signal, a circuit which rectifies a wireless signal, a circuit which generates first voltage, a charge circuit which stores second voltage, a charge control circuit, a voltage supply control circuit, and a circuit which controls the charge control circuit and the voltage supply control circuit. | 09-04-2008 |
20080266227 | METHOD FOR DRIVING LIQUID CRYSTAL DISPLAY DEVICE, LIQUID CRYSTAL DISPLAY DEVICE, AND ELECTRONIC DEVICE - An object of the present invention is to provide a driving method of a liquid crystal display device for improvement of image quality and a liquid crystal display device in which the driving method is used. One frame period is divided up into an n (n: integer, n≧3) number of periods (hereinafter referred to as subframe periods). Furthermore, a voltage is applied to a liquid crystal so as to correct for a loss in luminance resulting from response speed of the liquid crystal. The voltage for correction is applied during subframe periods other than the first subframe period. | 10-30-2008 |
20090153173 | Semiconductor Device - An object of the invention is to manage variation of electrical characteristics of an element in a semiconductor device due to a vapor deposition process by measuring electrical characteristics of a TEG. A substrate | 06-18-2009 |
20110018915 | SEMICONDUCTOR DEVICE - It is an object to provide a semiconductor device which can supply a signal with sufficient amplitude to a scan line while power consumption is kept small. Further, it is an object to provide a semiconductor device which can suppress distortion of a signal supplied to the scan line and shorten a rising time and a falling time while power consumption is kept small. A semiconductor device which includes a plurality of pixels each including a display element and at least one first transistor and a scan line driver circuit supplying a signal for selecting the plurality of pixels to a scan line. A light-transmitting conductive layer is used for a pixel electrode layer of the display element, a gate electrode layer of the first transistor, source and drain electrode layers of the first transistor, and the scan line. The scan line driver circuit includes a second transistor and a capacitor for holding a voltage between a gate electrode layer of the second transistor and a source electrode layer of the second transistor. The source electrode of the second transistor is connected to the scan line. | 01-27-2011 |
20110084265 | LIGHT-EMITTING DISPLAY DEVICE AND ELECTRONIC DEVICE INCLUDING THE SAME - An object is to provide a light-emitting display device in which a pixel including a thin film transistor using an oxide semiconductor has a high aperture ratio. The light-emitting display device includes a plurality of pixels each including a thin film transistor and a light-emitting element. The pixel is electrically connected to a first wiring functioning as a scan line. The thin film transistor includes an oxide semiconductor layer over the first wiring with a gate insulating film therebetween. The oxide semiconductor layer is extended beyond the edge of a region where the first wiring is provided. The light-emitting element and the oxide semiconductor layer overlap with each other. | 04-14-2011 |
20110085104 | LIQUID CRYSTAL DISPLAY DEVICE AND ELECTRONIC DEVICE INCLUDING THE SAME - An object is to provide a liquid crystal display device in which a pixel including a thin film transistor using an oxide semiconductor has a high aperture ratio. The liquid crystal display device includes a plurality of pixels each including a thin film transistor and a pixel electrode. The pixel is electrically connected to a first wiring functioning as a scan line. The thin film transistor includes an oxide semiconductor layer over the first wiring with a gate insulating film therebetween. The oxide semiconductor layer is extended beyond the edge of a region where the first wiring is provided. The pixel electrode and the oxide semiconductor layer overlap with each other. | 04-14-2011 |
20110090183 | LIQUID CRYSTAL DISPLAY DEVICE AND ELECTRONIC DEVICE INCLUDING THE LIQUID CRYSTAL DISPLAY DEVICE - In a liquid crystal display device including a plurality of pixels in a display portion and configured to performed display in a plurality of frame periods, each of the frame periods includes a writing period and a holding period, and after an image signal is input to each of the plurality of pixels in the writing period, a transistor included in each of the plurality of pixels is turned off and the image signal is held for at least 30 seconds in the holding period. The pixel includes a semiconductor layer including an oxide semiconductor layer, and the oxide semiconductor layer has a carrier concentration of less than 1×10 | 04-21-2011 |
20110090187 | Method of Driving Display Device, Display Device, and Electronic Appliance - The present invention is a method of driving a display device including a transistor, a capacitor one electrode of which is electrically connected to a first terminal of the transistor and the other electrode of which is electrically connected to a gate of the transistor, and a display element a first electrode of which is electrically connected to a second terminal of the transistor, including the steps of: electrically connecting the gate of the transistor, the first terminal of the transistor, and both electrodes of the capacitor to a first line in a first period; electrically connecting the gate of the transistor and the other electrode of the capacitor to a second line in a second period; and electrically connecting the first terminal of the transistor and one electrode of the capacitor to a third line in a third period. | 04-21-2011 |
20110090416 | LIQUID CRYSTAL DISPLAY DEVICE AND ELECTRONIC DEVICE INCLUDING THE SAME - A liquid crystal display device is provided in which the aperture ratio can be increased in a pixel including a thin film transistor in which an oxide semiconductor is used. In the liquid crystal display device, the thin film transistor including a gate electrode, a gate insulating layer and an oxide semiconductor layer which are provided so as to overlap with the gate electrode, and a source electrode and a drain electrode which overlap part of the oxide semiconductor layer is provided between a signal line and a pixel electrode which are provided in a pixel portion. The off-current of the thin film transistor is 1×10 | 04-21-2011 |
20110148846 | LIQUID CRYSTAL DISPLAY DEVICE AND DRIVING METHOD THEREOF - Disclosed is a liquid crystal display device and a driving method thereof for displaying an image, in which the polarity of a voltage applied to the liquid crystal element is inverted in a first frame period and a second frame period which are sequential. The voltage applied to the liquid crystal element is compensated in the case where images of the first frame period and the second frame period are judged as a still image as a result of comparison of the image of the first frame period with the image of the second frame period and the absolute value of the voltage applied to the liquid crystal element in the first frame period is different from that of the voltage applied to the liquid crystal element in the second frame period. | 06-23-2011 |
20110175862 | DISPLAY DEVICE INCLUDING LIGHT EMITTING ELEMENT - Each of a plurality of pixels includes a transistor, a capacitor, and a display element. One terminal of the capacitor is electrically connected to a first line. The other terminal of the capacitor is electrically connected to a gate of the transistor. In a first period, a first terminal of the transistor is electrically connected to the gate of the transistor and the gate of the transistor is electrically connected to a second line. In a second period, the first terminal of the transistor is electrically connected to the gate of the transistor and a second terminal of the transistor is electrically connected to a third line. In a third period, the first terminal of the transistor is electrically connected to the first line and the second terminal of the transistor is electrically connected to the display element. | 07-21-2011 |
20110175941 | METHOD FOR DRIVING LIQUID CRYSTAL DISPLAY DEVICE - In an image signal writing period, a first image signal is supplied to a first liquid crystal element and a first capacitor from a signal line. In a backlight lighting period, display is performed in a light-transmitting pixel portion in response to the first image signal. In a black grayscale signal writing period, a signal for black display is supplied to a second liquid crystal element and a second capacitor from the signal line in the reflective pixel portion. In a still image signal writing period, a second image signal is supplied to the first liquid crystal element, the first capacitor, the second liquid crystal element, and the second capacitor from the signal line. In a still image signal holding period, display is performed in the reflective pixel portion in response to the second image signal. | 07-21-2011 |
20110187758 | METHOD FOR DRIVING LIQUID CRYSTAL DISPLAY DEVICE - In a liquid crystal display device capable of displaying a moving image and a still image, a reduction in contrast due to light scattering in a reflective pixel portion or the like is suppressed and consumed power is reduced. As a driving method of a transflective liquid crystal display device including a plurality of pixels each including a plurality of light-transmitting pixel portions and a reflective pixel portion, an image signal for color display is supplied to the plurality of light-transmitting pixel portions and a signal for black display is supplied to the reflective pixel portion in a moving-image display period, and an image signal of black-and-white grayscale is supplied to the plurality of light-transmitting pixel portions and the reflective pixel portion in a still-image display period. | 08-04-2011 |
20110204424 | SEMICONDUCTOR DEVICE - An object is to provide a semiconductor device in which damages of an element such as a transistor are reduced even when physical force such as bending is externally applied to generate stress in the semiconductor device. A semiconductor device includes a semiconductor film including a channel formation region and an impurity region, which is provided over a substrate, a first conductive film provided over the channel formation region with a gate insulating film interposed therebetween, a first interlayer insulating film provided to cover the first conductive film, a second conductive film provided over the first interlayer insulating film so as to overlap with at least part of the impurity region, a second interlayer insulating film provided over the second conductive film, and a third conductive film provided over the second interlayer insulating film so as to be electrically connected to the impurity region through an opening. | 08-25-2011 |
20110254037 | Light-Emitting Device and Electronic Device - A low-power light-emitting device which can be manufactured in simple steps and is suitable for increasing definition and the size of a substrate is provided. The light-emitting device includes a layer for blocking visible light; a conductive layer that partly overlaps with the layer for blocking visible light; a color filter layer that includes an opening over the layer for blocking visible light; a first electrode layer for transmitting visible light that is connected to the conductive layer through the opening, over the color filter layer; an insulating partition over the first electrode layer overlapping with the opening; a layer containing an organic compound over the first electrode layer and the partition; and a second electrode layer over the layer containing an organic compound. The layer containing an organic compound includes a layer containing a donor substance and an acceptor substance and a layer containing a light-emitting organic compound. | 10-20-2011 |
20110292008 | Display Device and Driving Method Thereof - In order to achieve lower power consumption, a technique of performing display (partial display) by utilizing only a part of a display area is used. For example, a display area is divided, a plurality of driver circuits for driving the divided display areas independently are provided, and only a region where a fixed pattern is displayed is driven in a power saving mode, thereby partial display is performed; however, display cannot be performed at an arbitrary position. Alternatively, partial display can be performed by inputting a video signal to a pixel in an arbitrary display area; however, a structure of a driver circuit is complicated. The object of the invention is to provide a display device which can perform partial display at an arbitrary position and reduce power consumption. In partial display, operation of a signal line driver circuit is set so as to be stopped and a non-display signal is set so as to be outputted from the signal line driver circuit when a pixel in a non-display area is selected. | 12-01-2011 |
20110299003 | DISPLAY DEVICE AND ELECTRONIC DEVICE - An object is to provide a display device in which a difference in load capacitance between wirings is reduced in the case where different signals are supplied to plural pixels at the same timing with use of plural wirings; thus, deviation in the grayscale and/or signal delay can be reduced. The display device includes first to N-th (N is a natural number of 3 or larger) data lines for supplying different video signals; and a pixel including a selection transistor connected to one of the first to N-th data lines. The first to N-th data lines intersect with each other so that one of the first to N-th data lines is provided closest to one terminal of the selection transistor and connected to the one terminal of the selection transistor. | 12-08-2011 |
20120001881 | DRIVING METHOD OF LIQUID CRYSTAL DISPLAY DEVICE - An object is to provide a driving method of a liquid crystal display device with a low power consumption and a high image quality. A pixel includes a liquid crystal element and a transistor which controls supply of an image signal to the liquid crystal element. The transistor includes, in a channel formation region, a semiconductor which has a wider band gap than a silicon semiconductor and has a lower intrinsic carrier density than silicon, and has an extremely low off-state current. In inversion driving of pixels, image signals having opposite polarities are input to a pair of signal lines between which a pixel electrode is disposed. By employing such a structure, the quality of the displayed image can be increased even in the absence of a capacitor in the pixel. | 01-05-2012 |
20120032942 | LIQUID CRYSTAL DISPLAY DEVICE AND DRIVING METHOD OF THE SAME - Provided is a liquid crystal display device having a pixel including a transistor and a liquid crystal element and a protection circuit electrically connected to one of a source and a drain of the transistor through a data line. The protection circuit includes a first terminal supplied with a first power supply potential and a second terminal supplied with a second power supply potential higher than the first power supply potential. In a moving image display mode, an image signal is input from the data line to the liquid crystal element through the transistor, and the first power supply potential is set at the first potential. In a still image display mode, supply of the image signal is stopped, and the first power supply potential is set at the second potential. The second potential is substantially the same as the minimum value of the image signal. | 02-09-2012 |
20120033151 | LIQUID CRYSTAL DISPLAY DEVICE AND DRIVING METHOD THEREOF - A reflective region where display is performed with reflection of incident light through a liquid crystal layer and a transmissive region where display is performed by transmission of light from a backlight are provided, and the reflective mode and the transmissive mode are switched. In the case of displaying a full-color image, a pixel portion includes at least a first region and a second region, a plurality of lights of different hues are sequentially supplied to the first region according to a first order, and a plurality of lights of different hues are also sequentially supplied to the second region according to a second order which is different from the first order. In the transmissive mode, the reflective region is made to display black, so that decrease in contrast due to reflection of external light at the reflective region is prevented. | 02-09-2012 |
20120061665 | LIQUID CRYSTAL DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF - A photolithography step and an etching step for forming an island-shaped semiconductor layer is omitted, and a liquid crystal display device is manufactured through the following four photolithography steps: a step for forming a gate electrode (including a wiring or the like formed from the same layer), a step for forming a source electrode and a drain electrode (including a wiring or the like formed from the same layer), a step for forming a contact hole (including removal of an insulating layer or the like in a region other than the contact hole), and a step for forming a pixel electrode (including a wiring or the like formed from the same layer). In the step of forming the contact hole, a groove portion in which the semiconductor layer is removed is formed, so that formation of parasitic channels is prevented. | 03-15-2012 |
20120064677 | METHOD FOR MANUFACTURING SEMICONDUCTOR DEVICE - Provided is a method for manufacturing a semiconductor device with fewer masks and in a simple process. A gate electrode is formed. A gate insulating film, a semiconductor film, an impurity semiconductor film, and a conductive film are stacked in this order, covering the gate electrode. A source electrode and a drain electrode are formed by processing the conductive film. A source region, a drain region, and a semiconductor layer, an upper part of a portion of which does not overlap with the source region and the drain region is removed, are formed by processing the upper part of the semiconductor film, while the impurity semiconductor film is divided. A passivation film over the gate insulating film, the semiconductor layer, the source region, the drain region, the source electrode, and the drain electrode are formed. An etching mask is formed over the passivation film. At least the passivation film and the semiconductor layer are processed to have an island shape while an opening reaching the source electrode or the drain electrode is formed, with the use of the etching mask. The etching mask is removed. A pixel electrode is formed over the gate insulating film and the passivation film. | 03-15-2012 |
20130292679 | Light-Emitting Display Device And Electronic Device Including The Same - An object is to provide a light-emitting display device in which a pixel including a thin film transistor using an oxide semiconductor has a high aperture ratio. The light-emitting display device includes a plurality of pixels each including a thin film transistor and a light-emitting element. The pixel is electrically connected to a first wiring functioning as a scan line. The thin film transistor includes an oxide semiconductor layer over the first wiring with a gate insulating film therebetween. The oxide semiconductor layer is extended beyond the edge of a region where the first wiring is provided. The light-emitting element and the oxide semiconductor layer overlap with each other. | 11-07-2013 |
20140146034 | DISPLAY DEVICE - A display device is driven through no wire cable such as an FPC, and a display image is continuously held for a certain period of time by storing an image signal received from a wireless communication device so that the display image can be held even when the display device is out of communication range with the wireless communication device. A display device includes at least a pixel circuit having an SRAM (static random access memory) circuit, a circuit which controls the pixel circuit, an antenna circuit, a circuit which generates a demodulation signal, a circuit which rectifies a wireless signal, a circuit which generates first voltage, a charge circuit which stores second voltage, a charge control circuit, a voltage supply control circuit, and a circuit which controls the charge control circuit and the voltage supply control circuit. | 05-29-2014 |
20140204073 | LIQUID CRYSTAL DISPLAY DEVICE AND DRIVING METHOD OF THE SAME - Provided is a liquid crystal display device having a pixel including a transistor and a liquid crystal element and a protection circuit electrically connected to one of a source and a drain of the transistor through a data line. The protection circuit includes a first terminal supplied with a first power supply potential and a second terminal supplied with a second power supply potential higher than the first power supply potential. In a moving image display mode, an image signal is input from the data line to the liquid crystal element through the transistor, and the first power supply potential is set at the first potential. In a still image display mode, supply of the image signal is stopped, and the first power supply potential is set at the second potential. The second potential is substantially the same as the minimum value of the image signal. | 07-24-2014 |
20140210808 | LIQUID CRYSTAL DISPLAY DEVICE AND DRIVING METHOD THEREOF - Disclosed is a liquid crystal display device and a driving method thereof for displaying an image, in which the polarity of a voltage applied to the liquid crystal element is inverted in a first frame period and a second frame period which are sequential. The voltage applied to the liquid crystal element is compensated in the case where images of the first frame period and the second frame period are judged as a still image as a result of comparison of the image of the first frame period with the image of the second frame period and the absolute value of the voltage applied to the liquid crystal element in the first frame period is different from that of the voltage applied to the liquid crystal element in the second frame period. | 07-31-2014 |
20140327662 | Method of Driving Display Device, Display Device, and Electronic Appliance - The present invention is a method of driving a display device including a transistor, a capacitor one electrode of which is electrically connected to a first terminal of the transistor and the other electrode of which is electrically connected to a gate of the transistor, and a display element a first electrode of which is electrically connected to a second terminal of the transistor, including the steps of: electrically connecting the gate of the transistor, the first terminal of the transistor, and both electrodes of the capacitor to a first line in a first period; electrically connecting the gate of the transistor and the other electrode of the capacitor to a second line in a second period; and electrically connecting the first terminal of the transistor and one electrode of the capacitor to a third line in a third period. | 11-06-2014 |
20140368417 | LIQUID CRYSTAL DISPLAY DEVICE AND ELECTRONIC DEVICE INCLUDING THE LIQUID CRYSTAL DISPLAY DEVICE - In a liquid crystal display device including a plurality of pixels in a display portion and configured to performed display in a plurality of frame periods, each of the frame periods includes a writing period and a holding period, and after an image signal is input to each of the plurality of pixels in the writing period, a transistor included in each of the plurality of pixels is turned off and the image signal is held for at least 30 seconds in the holding period. The pixel includes a semiconductor layer including an oxide semiconductor layer, and the oxide semiconductor layer has a carrier concentration of less than 1×10 | 12-18-2014 |