Abstract: To provide an operation method of a semiconductor device in which a variation in arithmetic operation results is reduced. The semiconductor device includes first and second cell arrays and first to fifth circuits. First, third standard data is written from the fourth circuit to the second cell array, and first standard data is written from the first circuit to the first cell array. Then, second standard data is transmitted from the second circuit to the first cell array, a result of a product-sum operation of the first standard data and the second standard data is input from the first cell array to the third circuit, and fourth standard data corresponding to the result of the product-sum operation is transmitted from the third circuit to the second cell array.

Abstract: An electronic device having an eye tracking function is provided. The electronic device includes a display device and an optical system. The display device includes a first light-emitting element, a second light-emitting element, a sensor portion, and a driver circuit portion. The sensor portion includes a light-receiving element. The first light-emitting element has a function of emitting infrared light or visible light. The second light-emitting element has a function of emitting light of a color different from that of light emitted from the first light-emitting element. When the first light-emitting element emits infrared light, the light-receiving element has a function of detecting the infrared light that is emitted from the first light-emitting element and reflected by an eyeball of a user.

Abstract: A semiconductor device with a novel structure is provided. The semiconductor device includes a cell array performing a product-sum operation of a first layer and a product-sum operation of a second layer in an artificial neural network, a first circuit from which first data is input to the cell array, and a second circuit to which second data is output from the cell array. The cell array includes a plurality of cells. The cell array includes a first region and a second region. In a first period, the first region is supplied with the t-th (t is a natural number greater than or equal to 2) first data from the first circuit and outputs the t-th second data according to the product-sum operation of the first layer to the second circuit. In the first period, the second region is supplied with the (t+1)-th first data from the first circuit and outputs the (t+1)-th second data according to the product-sum operation of the second layer to the first circuit.

Abstract: To provide a novel electronic device. The electronic device includes a housing and a display device. The display device includes a first layer, a second layer, and a third layer. The first layer, the second layer, and the third layer are provided in different layers. The first layer includes a driver circuit and an arithmetic circuit. The second layer includes pixel circuits and a cell array. The third layer includes light-receiving devices and light-emitting devices. The pixel circuits each have a function of controlling light emission of the light-emitting device. The driver circuit has a function of controlling the pixel circuits. The arithmetic circuit has a function of performing arithmetic processing on the basis of first data corresponding to currents output from the light-receiving devices and second data corresponding to a potential held in the cell array.

Abstract: A digital signal coding/decoding circuit for coding/decoding digital scanning line signals by means of an MR coding/decoding algorithm has an MR coding/decoding circuit, a line buffer for temporarily storing information about a reference line which has been already coded or decoded, and a preparation circuit for producing compression codes from the reference line and for later expanding the compression codes into the reference line. The line buffer can be compact because it temporarily stores the compression codes rather than the reference line itself.