Abstract: An object is to provide a highly reliable display unit having a function of sensing light. The display unit includes a light-receiving device and a light-emitting device. The light-receiving device includes an active layer between a pair of electrodes. The light-emitting device includes a hole-injection layer, a light-emitting layer, and an electron-transport layer between a pair of electrodes. The light-receiving device and the light-emitting device share one of the electrodes, and may further share another common layer between the pair of electrodes. The hole-injection layer is in contact with an anode and contains a first compound and a second compound. The electron-transport property of the electron-transport layer is low; hence, the light-emitting layer is less likely to have excess electrons. Here, the first compound is the material having a property of accepting electrons from the second compound.

Abstract: A novel optical functional device that is highly convenient, useful, or reliable is provided. The optical functional device includes a light-emitting function, a photoelectric conversion function, a first electrode, a second electrode, and an optical functional layer. The light-emitting function converts electrical energy into first light, the first light has a first emission spectrum, and the first emission spectrum exhibits a maximum peak at a first wavelength. At a second wavelength, the intensity of the first emission spectrum is 80% of the maximum peak. The photoelectric conversion function has a spectral sensitivity characteristic; at a third wavelength, the spectral sensitivity characteristic has a maximum sensitivity within a range of 420 to 720 nm inclusive; and at a fourth wavelength, the sensitivity of the spectral sensitivity characteristic is 80% of the maximum sensitivity.

Abstract: An object is to provide a highly reliable display unit having a function of sensing light. The display unit includes a light-receiving device and a light-emitting device. The light-receiving device includes an active layer between a pair of electrodes. The light-emitting device includes a hole-injection layer, a light-emitting layer, and an electron-transport layer between a pair of electrodes. The light-receiving device and the light-emitting device share one of the electrodes, and may further share another common layer between the pair of electrodes. The hole-injection layer is in contact with an anode and contains a first compound and a second compound. The electron-transport property of the electron-transport layer is low; hence, the light-emitting layer is less likely to have excess electrons. Here, the first compound is the material having a property of accepting electrons from the second compound.

Abstract: The structure of an imaging device is simplified. An imaging device capable of imaging without a lens or an image processing method is provided. Image data which is out of focus is sharpened. An image processing method of image data in which a plurality of pixels are arranged is provided. Adjacent two pixels are each divided into a first region showing the same pixel value between the adjacent two pixels and a second region other than the first region, an initial value is supplied to the second region of an endmost pixel of the image data, and the pixel values of the first regions and the second regions of the plurality of arranged pixels are determined inductively and sequentially on the basis of the initial value.

Abstract: A light-receiving device in which an increase in driving voltage is inhibited is provided. Any of the following light-receiving devices is provided: a light-receiving device that includes a light-receiving layer between a pair of electrodes and in which the light-receiving layer includes an active layer, a buffer layer, and an electron-transport layer, the buffer layer is between the active layer and the electron-transport layer and is in contact with the active layer, and the buffer layer includes an organic compound having an electron-withdrawing group; a light-receiving device that includes a light-receiving layer between a pair of electrodes and in which the light-receiving layer includes an active layer, a buffer layer, and an electron-transport layer, the buffer layer is between the active layer and the electron-transport layer and is in contact with the active layer, and the buffer layer includes a heteroaromatic compound having an electron-withdrawing group.

Abstract: To provide a highly secure electronic device. The electronic device includes a control portion, a detection portion, and a memory portion. The detection portion has a function of detecting touch operation and a function of obtaining first finger data on a touching finger. The memory portion has a function of retaining second finger data registered in advance. The control portion has functions of comparing the first finger data with the second finger data and executing predetermined processing when these data match. The first finger data includes first fingerprint data and first positional data, and the second finger data includes second fingerprint data and second positional data.

Abstract: A display device featuring a touch detection and a fingerprint imaging functions is provided. A display device includes a light-emitting element and a light-receiving element. The light-emitting element includes a first pixel electrode, a light-emitting layer, and a common electrode, and the light-receiving element includes a second pixel electrode, an active layer, and the common electrode. The first pixel electrode and the second pixel electrode are provided on the same plane. The common electrode overlaps with the first pixel electrode with the light-emitting layer therebetween, and overlaps with the second pixel electrode with the active layer therebetween. A first conductive layer, a second conductive layer, and an insulating layer are provided above the common electrode. The insulating layer is provided above the first conductive layer, and the second conductive layer is provided above the insulating layer.

Abstract: An electronic device with a high security level is provided. The electronic device includes a control portion, a memory portion, and a display portion. The display portion has a function of displaying a first icon and a function of obtaining first fingerprint data in a display region of the first icon. The memory portion has a function of retaining second fingerprint data. The control portion has a function of comparing the first fingerprint data with the second fingerprint data; a function of executing first processing associated with the first icon in the case where the first fingerprint data and the second fingerprint data match; and a function of executing second processing in the case where the first fingerprint data and the second fingerprint data do not match.

Abstract: A flexible display device is manufactured with high yield. A display device having high resistance to repeated bending is provided. The display device is manufactured by forming a separation layer over a support substrate; forming, over the separation layer, an inorganic insulating layer including a first portion and a second portion; forming a display element over the inorganic insulating layer to be overlapped with the first portion; forming a connection electrode over the inorganic insulating layer to be overlapped with the second portion; sealing the display element; separating the support substrate and the inorganic insulating layer using the separation layer; attaching a substrate to the inorganic insulating layer to be overlapped with the first portion; and etching the second portion using the substrate as a mask to expose the connection electrode.

Abstract: A light-receiving device that is highly convenient, useful, or reliable is provided. The light-receiving device includes a light-receiving layer between a pair of electrodes, the light-receiving layer includes an active layer and a hole-transport layer, the hole-transport layer contains a first organic compound, and the first organic compound is an aromatic monoamine compound or a heteroaromatic monoamine compound having at least one skeleton of biphenylamine, carbazolylamine, dibenzofuranylamine, dibenzothiophenylamine, fluorenylamine, and spirofluorenylamine. Alternatively, the light-receiving device includes a light-receiving layer between a pair of electrodes, the light-receiving layer includes an electron-transport layer and an active layer, the electron-transport layer contains a second organic compound, and the second organic compound includes a triazine ring.

Abstract: To provide a novel photoelectric conversion device that is highly convenient, useful, or reliable. The photoelectric conversion device includes a first electrode, a second electrode, and a first unit. The first unit is located between the first electrode and the second electrode. The first unit contains a first electron-donating material and a first electron-accepting material. The first electron-donating material is a condensed aromatic compound, and the first electron-accepting material has a perylene skeleton and two or more alkyl groups. The alkyl groups each independently have 1 to 13 carbon atoms.

Abstract: A display device featuring a touch detection and a fingerprint imaging functions is provided. A display device includes a light-emitting element and a light-receiving element. The light-emitting element includes a first pixel electrode, a light-emitting layer, and a common electrode, and the light-receiving element includes a second pixel electrode, an active layer, and the common electrode. The first pixel electrode and the second pixel electrode are provided on the same plane. The common electrode overlaps with the first pixel electrode with the light-emitting layer therebetween, and overlaps with the second pixel electrode with the active layer therebetween. A first conductive layer, a second conductive layer, and an insulating layer are provided above the common electrode. The insulating layer is provided above the first conductive layer, and the second conductive layer is provided above the insulating layer.

Abstract: The structure of an imaging device is simplified. An imaging device capable of imaging without a lens or an image processing method is provided. Image data which is out of focus is sharpened. An image processing method of image data in which a plurality of pixels are arranged is provided. Adjacent two pixels are each divided into a first region showing the same pixel value between the adjacent two pixels and a second region other than the first region, an initial value is supplied to the second region of an endmost pixel of the image data, and the pixel values of the first regions and the second regions of the plurality of arranged pixels are determined inductively and sequentially on the basis of the initial value.

Abstract: The resolution of a display apparatus having a light detection function is increased. A display apparatus includes a plurality of transistors and a light-emitting and light-receiving device in a subpixel. The light-emitting and light-receiving device has a function of emitting light of a first color and a function of receiving light of a second color. One of a source and a drain of a first transistor is electrically connected to a first wiring, and the other thereof is electrically connected to a gate of a second transistor. One electrode of the light-emitting and light-receiving device is electrically connected to one of a source and a drain of the second transistor, one of a source and a drain of a third transistor, and one of a source and a drain of a fifth transistor. One of a source and a drain of a fourth transistor is electrically connected to a second wiring, and the other thereof is electrically connected to the other of the source and the drain of the third transistor.

Abstract: A thin lightweight imaging device is provided. A highly convenient imaging device is provided. The imaging unit includes an imaging unit, a memory, and an arithmetic circuit. The imaging unit includes a light-receiving device, a first light-emitting device, and a second light-emitting device. The first light-emitting device has a function of emitting light in a wavelength range that is different from a wavelength range of light emitted by the second light-emitting device. The imaging unit has a function of making the first light-emitting device emit light and acquiring first image data. The imaging unit has a function of making the second light-emitting device emit light and acquiring second image data. The memory has a function of retaining the first reference data and the second reference data. The arithmetic circuit has a function of correcting the first image data with the use of the first reference data retained in the memory and calculating first correction image data.

Abstract: A flexible display device is manufactured with high yield. A display device having high resistance to repeated bending is provided. The display device is manufactured by forming a separation layer over a support substrate; forming, over the separation layer, an inorganic insulating layer including a first portion and a second portion; forming a display element over the inorganic insulating layer to be overlapped with the first portion; forming a connection electrode over the inorganic insulating layer to be overlapped with the second portion; sealing the display element; separating the support substrate and the inorganic insulating layer using the separation layer; attaching a substrate to the inorganic insulating layer to be overlapped with the first portion; and etching the second portion using the substrate as a mask to expose the connection electrode.

Abstract: A display device having both a function of a touch sensor and a function of fingerprint recognition is provided. The display device includes a first display region and a second display region. The first display region and the second display region are provided in contact with each other. The first display region includes a plurality of first light-emitting elements and a plurality of first photodetectors. The second display region includes a plurality of second light-emitting elements and a plurality of second photodetectors. The first photodetector has a function of receiving first light emitted from the first light-emitting element. The second photodetector has a function of receiving second light emitted from the second light-emitting element. The first light-emitting elements and the first photodetectors are arranged in a matrix in the first display region. The second light-emitting elements and the second photodetectors are arranged in a matrix in the second display region.

Abstract: A novel functional panel that is highly convenient, useful, or reliable is provided. The functional panel includes a first element and a second element. The first element includes a first electrode, a second electrode, and a first optical functional layer. The first optical functional layer includes a region interposed between the first electrode and the second electrode. The first optical functional layer includes a first layer and a layer containing a first light-emitting material. The second element includes a third electrode, the second electrode, and a second optical functional layer. The second optical functional layer includes a region interposed between the third electrode and the second electrode. The second optical functional layer includes the first layer and a layer containing a photoelectric conversion material.

Abstract: The resolution of a display apparatus having alight detection function is increased. The display apparatus includes a light-emitting device and a light-emitting and light-receiving device. The light-emitting device includes a first pixel electrode, a first light-emitting layer, and a common electrode; the light-emitting and light-receiving device includes a second pixel electrode, a second light-emitting layer, an active layer, and the common electrode; the active layer includes an organic compound; the first light-emitting layer is positioned between the first pixel electrode and the common electrode; the second light-emitting layer and the active layer are each positioned between the second pixel electrode and the common electrode; the light-emitting device has a function of emitting light of a first color; and the light-emitting and light-receiving device has a function of emitting light of a second color and a function of receiving light of the first color.

Abstract: A display apparatus having a photosensing function is provided. The display apparatus includes a first pixel circuit and a second pixel circuit. The first pixel circuit includes a light-receiving device, a first transistor, and a second transistor. The second pixel circuit includes a light-emitting device. The light-receiving device includes a first pixel electrode, an active layer, and a common electrode. The light-emitting device includes a second pixel electrode, a light-emitting layer, and the common electrode. The active layer is positioned over the first pixel electrode and includes a first organic compound. The light-emitting layer is positioned over the second pixel electrode and includes a second organic compound different from the first organic compound. The common electrode includes a portion overlapping with the first pixel electrode with the active layer therebetween and a portion overlapping with the second pixel electrode with the light-emitting layer therebetween.