Abstract: It is an object of the present invention to prevent an insulating film from peeling in a section where the insulating film is adjacent to a sealing region. Over a first substrate 104, a pixel portion 100 provided with a light emitting element, a source driver 101, a gate driver 102, and a sealing region 103 are provided. A light emitting element is sealed between the first substrate 104 and a second substrate 110 by a sealant 108. An insulating film 107 serves as a partition wall of the light emitting element. An end portion of the insulating film 107 which is adjacent to the sealing region 103 does not overlap with a step formed by a side surface and an upper surface of a conductive film 106 which serves as a wiring.

Abstract: It is an object of the present invention to prevent an insulating film from peeling in a section where the insulating film is adjacent to a sealing region. Over a first substrate 104, a pixel portion 100 provided with a light emitting element, a source driver 101, a gate driver 102, and a sealing region 103 are provided. A light emitting element is sealed between the first substrate 104 and a second substrate 110 by a sealant 108. An insulating film 107 serves as a partition wall of the light emitting element. An end portion of the insulating film 107 which is adjacent to the sealing region 103 does not overlap with a step formed by a side surface and an upper surface of a conductive film 106 which serves as a wiring.

Abstract: To output a digital signal corresponding to illuminance without being adversely affected by circuit delay. A photoelectric conversion device includes a photoelectric conversion element; a ramp-wave output circuit; a first comparator for comparing the ramp-wave signal and a first potential; a second comparator for comparing the ramp-wave signal and a second potential; a flip-flop circuit for generating a clock signal whose frequency is changed in accordance with the amount of photocurrent; a circuit for calculating a negative OR of the output signal of the first comparator and the output signal of the second comparator; a counter circuit for counting the pulse number of the clock signal; and a pulse output circuit for generating a period during which the pulse number is counted in the counter circuit. The pulse output circuit includes a switch for stopping the generation of the period during which the pulse number is counted.

Abstract: A photometric device with a wide dynamic range. The photometric device includes a constant current generation circuit, a fixed clock signal generation circuit which generates a fixed clock signal having a fixed frequency, a photoelectric conversion element, a variable clock signal generation circuit and a digital signal generation circuit. The fixed clock signal generation circuit generates a fixed clock signal that oscillates at a fixed frequency, from constant current The variable clock signal generation circuit generates a variable clock signal that oscillates at a frequency proportional to the amount of photocurrent, from photocurrent generated in the photoelectric conversion element. The digital signal generation circuit sets a measurement period using the fixed clock signal, counts the number of pulses of the variable clock signal that oscillates for the measurement period, and outputs a digital signal including the count value as data.

Abstract: Objects are to accumulate electric charge in a capacitor so that light intensity can be detected even when the amount of incident light is small, and to operate a photoelectric conversion device without increasing the number of elements such as a constant current source or a switch. The photoelectric conversion device includes a photoelectric conversion circuit, a capacitor, and a comparator for comparing a potential of one electrode of the capacitor with a second potential. The photoelectric conversion circuit includes a photoelectric conversion element and an amplifier circuit for amplifying an output current from the photoelectric conversion element In the capacitor, a first potential is supplied through a first switch, and charging or discharging is performed through a second switch in accordance with the current amplified by the amplifier circuit.

Abstract: It is an object of the present invention to prevent an insulating film from peeling in a section where the insulating film is adjacent to a sealing region. Over a first substrate 104, a pixel portion 100 provided with a light emitting element, a source driver 101, a gate driver 102, and a sealing region 103 are provided. A light emitting element is sealed between the first substrate 104 and a second substrate 110 by a sealant 108. An insulating film 107 serves as a partition wall of the light emitting element. An end portion of the insulating film 107 which is adjacent to the sealing region 103 does not overlap with a step formed by a side surface and an upper surface of a conductive film 106 which serves as a wiring.

Abstract: The present invention provides a semiconductor device in which a power line is not affected by noise due to a voltage drop caused by instantaneous high-current consumption in the buffer portion and that has no possibility that a logic portion malfunctions. In a case where the same potential is supplied to a logic portion and a buffer portion, by a method in which separate FPC terminals are used for the logic portion and the buffer portion, or by a method in which the FPC terminal is shared but a power line is branched for the logic portion and the buffer portion at a point close to the FPC terminal, a problem that the logic portion is affected by noise generated by a voltage drop of the power line due to instantaneous high-current consumption in the buffer portion can be prevented.