Abstract:
A novel liquid crystal display device (LCD) including a touch sensor. The LCD includes a first substrate and a second substrate, which face each other, and a liquid crystal layer. The first substrate is provided with a pixel electrode. The second substrate is provided with a first electrode, a second electrode, and an insulating layer. The pixel electrode overlaps with the first electrode with the liquid crystal layer interposed therebetween. The second electrode overlaps with the first electrode with the insulating layer interposed therebetween. The LCD generates a signal corresponding to a potential of the second electrode. This structure enables a thin and lightweight LCD.
Abstract:
A liquid crystal composition including a dioxolane compound represented by the general formula (G1) as a chiral agent is provided. In the general formula (G1), R1 and R2 individually represent any of hydrogen, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryl group having 6 to 12 carbon atoms, and an alkyl group having 1 to 20 carbon atoms and having a phenyl group as a substituent; R1 and R2 may be bonded to each other to form a ring; R3 and R4 individually represent any of hydrogen, an alkyl group having 1 to 6 carbon atoms, and a cycloalkyl group; and R5 to R40 individually represent any of hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, and an aryl group having 6 to 12 carbon atoms.
Abstract:
A novel material for a liquid crystal composition that can be used for various liquid crystal devices is provided. A novel cyanobiphenyl derivative represented by General Formula (G1) is provided. In General Formula (G1), R1 represents a single bond or a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms. Note that in General Formula (G1), R1 may have a substituent. Examples of the substituent are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), a cyano group (CN), a trifluoromethylsulfonyl group (SO2CF3), a trifluoromethyl group (CF3), a nitro group (NO2), an isothiocyanate group (NCS), and a pentafluorosulfanyl group (SF5).
Abstract:
A nonaqueous solvent that can be used in a wide temperature range, has a low viscosity, has high lithium ion conductivity at low temperatures, or has high heat resistance is provided. The nonaqueous solvent containing an ionic liquid and an organic electrolyte for low-temperature use has a low viscosity even at low temperatures and has high carrier ion conductivity. As the organic electrolyte for low-temperature use, an electrolyte in which methyl ethyl carbonate accounts for greater than or equal to 30 volume % and less than or equal to 65 volume % can be used. A battery using the nonaqueous solvent as an electrolyte can be used in a wide temperature range and thus is preferable.
Abstract:
A power storage system with a high energy density is provided. A power storage system with a high degree of safety is provided. A secondary battery with a high energy density is provided. A secondary battery with a high degree of safety is provided. A charging unit has a function of controlling start and stop of charge of a secondary battery and a function of controlling a charge current of the secondary battery. The secondary battery includes a positive electrode, the positive electrode includes a positive electrode active material particle, the positive electrode active material particle is lithium cobalt oxide to which magnesium is added. The charging unit has a function of controlling charge of the secondary battery by a first step of starting constant current charge of the secondary battery at a time t1; and a second step of stopping the charge at a time t2. A crystal structure of the lithium cobalt oxide at the time t2, which is determined by powder X-ray diffraction, is a crystal structure represented by a space group R-3m.
Abstract:
An active material particle with little deterioration is provided. A positive electrode active material particle with little deterioration is provided. The electrode includes a first particle group, a second particle group, and a third particle group. A median diameter of the first particle group is greater than a median diameter of the third particle group, and a median diameter of the second particle group is between the median diameter of the first particle group and the median diameter of the third particle group. The electrode is formed through a first step of forming a first mixture including the first particle group, the second particle group, the third particle group, and a solvent; a second step of applying the first mixture onto a current collector; and a third step of performing heating to volatilize the solvent.
Abstract:
To provide a display device or the like that enables stable curing of a resin. The display device includes a first circuit and a second circuit over the same substrate. The first circuit has a function of performing display; the second circuit has a function of driving the first circuit; the second circuit includes a transistor and a capacitor; the transistor includes an oxide semiconductor layer over a first insulating layer; the capacitor includes a first conductive layer, a second insulating layer, and a second conductive layer; the first conductive layer is positioned over the first insulating layer; one of a source and a drain of the transistor is electrically connected to the second conductive layer; and the first conductive layer and the oxide semiconductor layer include the same metal element.
Abstract:
Disclosed is a liquid crystal display device which can be used in a variety of situations and applications. The liquid crystal display device comprises: a first substrate comprising a first display region, a second display region, and a third display region wherein the first display region, the second display region, and the third display region are continuously formed; a second substrate having a form which fits the first substrate; and a liquid crystal interposed between the first substrate and the second substrate. The second display region is interposed between the first display region and the second display region. The second display region is curved, and the first display region and the second display region are substantially flat.
Abstract:
A novel display panel that can be used as a reflective display panel in an environment with strong external light and as a self-luminous display panel in a dim environment, for example and that has low power consumption and is highly convenient or reliable is provided. The display panel includes a pixel and a substrate that supports the pixel. The pixel includes a first display element (e.g., a reflective liquid crystal element) that includes a reflective film having an opening as a first conductive film and a second display element (e.g., an organic EL element) that emits light to the opening.
Abstract:
A liquid crystal display device is provided, which includes a thin film transistor including an oxide semiconductor layer, a first electrode layer, a second electrode layer having an opening, a light-transmitting chromatic-color resin layer between the thin film transistor and the second electrode layer, and a liquid crystal layer. One of the first electrode layer and the second electrode layer is a pixel electrode layer which is electrically connected to the thin film transistor, and the other of the first electrode layer and the second electrode layer is a common electrode layer. The light-transmitting chromatic-color resin layer is overlapped with the pixel electrode layer and the oxide semiconductor layer of the thin film transistor.