Abstract:
A semiconductor device capable of holding analog data is provided. Two holding circuits, two bootstrap circuits, and one source follower circuit are formed with use of four transistors and two capacitors. A memory node is provided in each of the two holding circuits; a data potential is written to one of the memory nodes and a reference potential is written to the other of the memory nodes. At the time of data reading, the potential of the one memory node is increased in one of the bootstrap circuits, and the potential of the other memory node is increased in the other of the bootstrap circuits. A potential difference between the two memory nodes is output by the source follower circuit. With use of the source follower circuit, the output impedance can be reduced.
Abstract:
An imaging device having a function of processing an image is provided. The imaging device has an additional function such as image processing, can hold analog data obtained by an image capturing operation in a pixel, and can extract data obtained by multiplying the analog data by a predetermined weight coefficient. Difference data between adjacent light-receiving devices can be obtained in a pixel, and data on luminance gradient can be obtained. When the data is taken in a neural network or the like, inference of distance data or the like can be performed. Since enormous volume of image data in the state of analog data can be held in pixels, processing can be performed efficiently.
Abstract:
An imaging device that can obtain imaging data corresponding to high-resolution images in a short period of time is provided. The imaging device includes a pixel including a photoelectric conversion element and n (n is an integer more than 2 inclusive) retention circuits. The photoelectric conversion element and the n retention circuits are stacked. One electrode of the photoelectric conversion element is electrically connected to the first to n-th retention circuits. The retention circuits include OS transistors with an extremely low off-state current feature, and can retain imaging data for a long time. In the first to n-th periods, the imaging device obtains the first to n-th imaging data and retains it in the first to n-th retention circuits. Then, the first to n-th imaging data retained in the first to n-th retention circuits are read out. The read imaging data is output outside the imaging data through AD conversion.
Abstract:
An imaging device with a novel structure is provided. The imaging device includes an imaging region provided with a plurality of pixels. The plurality of pixels included in the imaging region include a first pixel and a second pixel. The imaging device has a function of selecting a first region or a second region. The first region includes the same number of pixels as the second region. The first region includes at least the first and second pixels. The second region includes at least the second pixel. The pixels included in the first region or the second region have a function of outputting imaging signals obtained by the pixels. The imaging device generates first image data by concurrently reading the imaging signals output from the pixels included in the first region and performing arithmetic operation on the signals. The imaging device generates second image data by concurrently reading the imaging signals output from the pixels included in the second region and performing arithmetic operation on the signals. A first conceptual image can be generated with the use of the first image data and the second image data.
Abstract:
An imaging device that can obtain imaging data corresponding to high-resolution images in a short period of time is provided. The imaging device includes a pixel including a photoelectric conversion element and n (n is an integer more than 2 inclusive) retention circuits. The photoelectric conversion element and the n retention circuits are stacked. One electrode of the photoelectric conversion element is electrically connected to the first to n-th retention circuits. The retention circuits include OS transistors with an extremely low off-state current feature, and can retain imaging data for a long time. In the first to n-th periods, the imaging device obtains the first to n-th imaging data and retains it in the first to n-th retention circuits. Then, the first to n-th imaging data retained in the first to n-th retention circuits are read out. The read imaging data is output outside the imaging data through AD conversion.
Abstract:
Provided is a semiconductor device in which power consumption and rewrite time needed for changing the parameter for color adjustment, dimming, or the like are reduced. One embodiment of a semiconductor device of the present invention includes an image processing portion including a plurality of functional circuits configured to correct image data, a plurality of scan chains corresponding to the plurality of functional circuits, and a controller controlling operations of the plurality of scan chains. During a state in which the controller controls the scan chains so that one or more scan chains chosen from the plurality of scan chains are driven and the scan chains except for the one or more scan chains are not driven, a parameter stored in one or more functional circuits connected to the one or more scan chains is rewritten.
Abstract:
An imaging device with low power consumption. The imaging device includes a plurality of pixels arranged in a matrix, a first circuit, a second circuit, a third circuit, and a fourth circuit. The first circuit has a function of converting an analog signal into a digital signal. The second circuit has a function of detecting a difference between image data of a first frame and image data of a second frame. The third circuit has a function of controlling the frequency of a clock signal. The fourth circuit has a function of generating clock signals of a plurality of frequencies.
Abstract:
The storage circuit includes first and second logic circuits, first and second transistors whose channel formation regions include an oxide semiconductor, and a capacitor. The first and second transistors are connected to each other in series, and the capacitor is connected to a connection node of the first and second transistors. The first transistor functions as a switch that controls connection between an output terminal of the first logic circuit and the capacitor. The second transistor functions as a switch that controls connection between the capacitor and an input terminal of the second logic circuit. Clock signals whose phases are inverted from each other are input to gates of the first and second transistors. Since the storage circuit has a small number of transistors and a small number of transistors controlled by the clock signals, the storage circuit is a low-power circuit.
Abstract:
A semiconductor device in which a nonvolatile memory can normally operate and power saving can be performed with a P-state function, and a driving method of the semiconductor device are provided. The semiconductor device includes: a first circuit configured to control a state including a driving voltage and a clock frequency of a processor core; a first memory circuit and a second memory circuit which store state data; a second circuit generating a power supply voltage and a third circuit generating a clock which are electrically connected to the first circuit; and the processor core electrically connected to the second circuit and the third circuit through a switch. The processor cores includes: a volatile memory; and a nonvolatile memory transmitting and receiving data to/from the first memory.
Abstract:
A method for limiting writing of data to a specific memory cell without disconnecting a wiring of a memory cell array or placing a prober in contact with a memory cell, a row, or a column is provided. Row address data and column address data of a memory cell to which data cannot be written are stored in a register. Enable data which controls data writing is stored in the register. Next, in order to write data to a memory cell, row address data and column address data of a memory cell to which data is written, writing enable data, and the like are output from a logic circuit; thus, writing of data to a memory cell corresponding to the address data stored in the register is inhibited.