Micro-LEDs have a characteristic for wavelength shifts depending on a current density. Therefore, a PAM pixel circuit generates wavelength shifts according to the current of gray scale control for micro-LED display. To solve this problem, this paper proposes a new PWM pixel circuit for gray scale controls using LTPS TFTs.Author Keywords P-type low temperature poly-silicon thin-film transistors (LTPS TFTs), Pulse width modulation (PWM) pixel circuit, Micro-LED, Wavelength shift.

Charge-trap flash- (CTF) memory structures have been fabricated by employing IrO2 nanodots (NDs) grown by atomic-layer deposition. A band of isolated IrO2NDs of about 3 nm lying almost parallel to Si/SiO2 interface is confirmed by transmission electron microscopy and x-ray photoelectron spectroscopy. The memory device with IrO2NDs shows much larger capacitance–voltage (C–V) hysteresis and memory window compared with the control sample without IrO2NDs. After annealing at 800 °C for 20 min, the ND device shows almost no change in the width of C–V hysteresis and the ND distribution. These results indicate that the IrO2NDs embedded in SiO2 can be utilized as thermally stable, discrete charge traps, promising for metal oxide-ND-based CTF memory devices.

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We present our aeromagnetic survey results from an investigation of the iron ore mineral distribution in Pocheon, Korea, in the west-central area of the Korean Peninsula. A manned aeromagnetic system using a helicopter for regional exploration and an unmanned aeromagnetic system using a multicopter for high-resolution exploration were used for the survey. The inversion results of the magnetic data confirmed the possibility of the existence of a new iron ore body. Drilling was carried out based on inversion results and drilling revealed amphibolite including iron ore, as indicated by a strong magnetic response. The position and depth of the iron ore were consistent with the interpretation results of the magnetic data.

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