Abstract:
An object is to provide an electrochemical device in which lithium deposition and reduction in battery capacity can be inhibited even when the concentration of a lithium salt in an electrolytic solution is lower than 1.0 M. Lithium deposition can be inhibited and lithium whiskers can be dissolved by applying an inversion pulse current for a short time more than once in a charging period of a secondary battery which deteriorates. By applying the inversion pulse current more than once, deterioration of a lithium-ion secondary battery due to repeated charging can be suppressed even when it is a secondary battery in which the concentration of a lithium salt in an electrolytic solution is lower than 1.0 M and therefore lithium is easily deposited.
Abstract:
To provide a semiconductor device having a high aperture ratio and including a capacitor with a high charge capacitance. To provide a semiconductor device with a narrow bezel. A transistor over a substrate; a first conductive film over a surface over which a gate electrode of the transistor is provided; a second conductive film over a surface over which a pair of electrodes of the transistor is provided; and a first light-transmitting conductive film electrically connected to the first conductive film and the second conductive film are included. The second conductive film overlaps the first conductive film with a gate insulating film of the transistor laid between the second conductive film and the first conductive film.
Abstract:
Transistors each include a gate electrode, a gate insulating layer over the gate electrode, an oxide semiconductor layer over the gate insulating layer, and a source electrode and a drain electrode over the oxide semiconductor layer. A driver circuit portion includes first to third wirings formed in the same step as the gate electrode, fourth to sixth wirings formed in the same step as the source electrode and the drain electrode, a seventh wiring formed in the same step as a pixel electrode, a first region where the second wiring intersects with the fifth wiring, and a second region where the third wiring intersects with the sixth wiring. The first wiring is connected to the fourth wiring through the seventh wiring. A distance between the wirings in the second region is longer than that in the first region.
Abstract:
An object is to inhibit a decrease in the capacity of a power storage device or to compensate the capacity, by adjusting or rectifying an imbalance between a positive electrode and a negative electrode, which is caused by decomposition of an electrolyte solution at the negative electrode. Provided is a charging method of a power storage device including a positive electrode using an active material that exhibits two-phase reaction, a negative electrode, and an electrolyte solution. The method includes the steps of, after constant current charging, performing constant voltage charging with a voltage that does not cause decomposition of the electrolyte solution until a charging current becomes lower than or equal to a lower current value limit; and after the constant voltage charging, performing additional charging with a voltage that causes decomposition of the electrolyte solution until a resistance of the power storage device reaches a predetermined resistance.
Abstract:
A semiconductor device in which the aperture ratio and which includes a capacitor with increased charge capacity is provided. A semiconductor device in which the number of masks used in a manufacturing process is reduced and the manufacturing costs are reduced is also provided. An impurity is contained in a light-transmitting semiconductor film so that the semiconductor film functions as one of a pair of electrodes in a capacitor. The other pair of electrodes is formed using a light-transmitting conductive film such as a pixel electrode. Further, a scan line and a capacitor line are provided on the same surface and in parallel to each other. An opening reaching the capacitor line and an opening reaching a conductive film which can be formed in the formation of a source electrode or a drain electrode of the transistor can be formed concurrently in an insulating film.
Abstract:
The liquid crystal display device includes a first substrate provided with a terminal portion, a switching transistor, a driver circuit portion, and a pixel circuit portion including a pixel transistor and a plurality of pixels, a second substrate provided with a common electrode electrically connected to the terminal portion through the switching transistor, and liquid crystal between a pixel electrode and the common electrode. In a period during which a still image is switched to a moving image, the following steps are sequentially performed: a first step of supplying the common potential to the common electrode; a second step of supplying a power supply voltage to the driver circuit portion; a third step of supplying a clock signal to the driver circuit portion; and a fourth step of supplying a start pulse signal to the driver circuit portion.
Abstract:
A liquid crystal display device whose power consumption is reduced while image quality is prevented from being degraded is provided. Further, a method for driving a liquid crystal display device whose power consumption is reduced while image quality is prevented from being degraded is provided. The liquid crystal display device includes a transistor whose leakage current in an off state is reduced and a liquid crystal element. The capacitance of a pixel satisfies the formula (1) and the formula (2).
Abstract:
Degradation in image quality of a display image is prevented. A pixel portion which includes a plurality of pixel circuits in row and column directions is divided into a plurality of regions in the row direction. In each of the plurality of regions, operation in which data is written to the pixel circuits on a row basis and the pixel circuits to which the data is written are irradiated with light corresponding to the written data is performed a plurality of times in one frame period in such a manner that at least three single-color image data for displaying the three primary colors are written in one frame period; and black image data is written to the pixel circuits every time before any of the plurality of single-color image data is written to the pixel circuits in each of the plurality of regions.
Abstract:
A transistor using an oxide semiconductor film is provided, the transistor having a small parasitic capacitance and including a back-gate electrode with a high controllability of threshold voltage. In the transistor using an oxide semiconductor film, the back-gate electrode overlaps with a drain electrode and does not overlap with a source electrode. By providing the back-gate electrode so as to overlap with the drain electrode and not to overlap with the source electrode, the operation speed of the transistor can be increased without decreasing the controllability of threshold voltage of the transistor as compared with the case where the back-gate electrode is provided so as to overlap with both the drain electrode and the source electrode.
Abstract:
To increase the detection sensitivity of a touch panel, provide a thin touch panel, provide a foldable touch panel, or provide a lightweight touch panel. A display element and a capacitor forming a touch sensor are provided between a pair of substrates. Preferably, a pair of conductive layers forming the capacitor each have an opening. The opening and the display element are provided to overlap each other. A light-blocking layer is provided between a substrate on the display surface side and the pair of conductive layers forming the capacitor.