NEC

About: NEC is a company organization based out in Tokyo, Japan. It is known for research contribution in the topics: Signal & Layer (electronics). The organization has 33269 authors who have published 57670 publications receiving 835952 citations. The organization is also known as: NEC Corporation & NEC Electronics Corporation.

Drive circuit for display device

Abstract: A drive circuit drives a display device including a plurality of pixels arranged as a matrix. Luminous elements are provided for the individual pixels. In this circuit, the luminous element and a drive transistor for driving the luminous element in each of the pixels are serially connected between a first power supply and a second power supply. A first switching transistor supplies the gate of the drive transistor with a control signal for controlling the drive transistor. A differential amplifier compares a voltage at a connection point between the luminous element and the drive transistor, and a control voltage which is input in the differential amplifier so as to control the luminance of the pixel, thereby generating a control signal. The control signal is supplied to the gate of the drive transistor via the first switching transistor. A hold capacitor holds a voltage between the gate and the source of the drive transistor. Thus, the drive circuit does not present a luminance unevenness, enables a high gradation display, prevents a decrease of the yield and the aperture ratio, and decreases the price and the power consumption.

Vector processor which can be formed by an integrated circuit of a small size

Abstract: In a vector calculation unit (31), a multiplication and an addition result register (50 and 53) are connected to a pipeline multiplier (14) and a pipeline adder (15), respectively. A multiplication and an addition result bus (52 and 55) are connected to the multiplication and the addition result registers, respectively. A selector (S1) connects one of an input bus (11) and the multiplication and the addition result buses to the first operand register to which a first multiplication and a first addition operand bus (44 and 45') are connected. A selector (S2) connects one of another input bus (12) and the multiplication and the addition result buses to the second operand register to which second multiplication and second addition operand buses (48 and 49) are connected. A selector (S3) connects one of the first multiplication operand, the multiplication result, and the addition result buses to an input of the multiplier. A selector (S4) connects one of the second multiplication operand, the multiplication result, and the addition result buses to another input of the multiplier. A selector (S5) connects one of the first addition operand, the multiplication result, and the addition result buses to an input of the adder. A selector (S6) connects one of the second addition operand, the multiplication result, and the addition result buses to another input of the adder. A selector (S7) connects one of the first addition operand, the second addition operand, the multiplication result, and the addition result buses to an output bus (13).

Electrical control of Curie temperature in cobalt using an ionic liquid film

Abstract: The electric field effect on magnetization properties and Curie temperature of Co ultra-thin films has been investigated. An electric field is applied to a Co film by using an electric double layer (EDL) formed in a polymer film containing an ionic liquid. The change in the Curie temperature is ∼100 K by applying the gate voltage of ±2 V, suggesting that the observed large modifications of magnetization properties are attributed to the significant change in the Curie temperature, which is induced by a large amount of carrier density control due to the formation of the EDL.

Over 720 Ghz (5. 8nm) frequency tuning by a 1.5 μm DBR laser with phase and Bragg wavelength control regions

Abstract: A 15 μm distributed Bragg reflector (DBR) laser with phase and Bragg wavelength control regions was newly developed Over 720 GHz (58 nm) continuous frequency tuning with 2mW light output were achieved for the first time