41 results about "Threshold shift" patented technology

A system and method for driving an AMOLED display is provided. The AMOLED display includes a plurality of pixel circuits. A voltage-programming scheme, a current-programming scheme or a combination thereof is applied to drive the display. Threshold shift information, and / or voltage necessary to obtain hybrid driving circuit may be acquired. A data sampling may be implemented to acquire a current / voltage relationship. A feedback operation may be implemented to correct the brightness of the pixel.

The present invention provides a novel method in altering the sequence of multi-level-cell programming in a multi-bit-cell of a nitride trapping memory cell that reduces or eliminates voltage threshold shifts between program steps while avoiding the suppression in the duration of a read window caused by a complementary bit disturbance. In a first embodiment, the present invention programs the multi-level cell in a multi-bit-cell having four bits in the following order: programming a third program level (level3), programming a first program level (level1) and a second program level (level2) to level 1, and programming the second program level from the first program level. In a second embodiment, the present invention programs the multi-level cell in the multi-bit-cell having four bits in the following order: programming a third program level (level3), programming a second program level (level2), and programming a first program level (level1).

Based on the results of detection of characteristics of drive transistors and organic EL elements, a control circuit finds magnitudes of threshold shifts of the drive transistors and the organic EL elements. A power supply voltage control unit sets a value of a low-level power supply voltage to a value lower, by a voltage value corresponding to an average value of the magnitudes of the threshold shifts for all pixels, than a value at an initial point in time. Furthermore, the power supply voltage control unit adjusts a value of a high-level power supply voltage, depending on magnitudes of mobilities obtained by detection of characteristics of the drive transistors.

Oxygen scavenging material embedded in an isolation structure provides improved protection of high dielectric constant (Hi-K) materials from oxygen contamination while avoiding alteration of work function and switching threshold shift in transistors including such Hi-K materials.

A gas detection system is provided for identifying a gas. The gas detection system includes a sensing module with a hollow chamber enclosed by a chamber housing. Additionally, the sensing module includes an optical sensing fiber positioned within the hollow chamber. The optical sensing fiber includes a gas sensor including a fiber Bragg grating positioned at a grating location along the optical sensing fiber, and a sensing layer affixed to an exterior surface of the optical sensing fiber at the grating location. After the gas is directed into the hollow chamber, the sensing layer and the gas exchange heat energy, based in part on a heat transfer coefficient of the gas. The exchange of the heat energy induces a shift in a Bragg resonant wavelength of the fiber Bragg grating which exceeds a threshold shift required for detection, where the shift is used to identify the gas.

The invention discloses a pixel circuit of an organic light emitting display, comprising a first power line, a second power line, a data line, a reference voltage, an organic light emitting diode, a storage capacitor and eight transistors T1-T8, wherein the data line is connected with a source electrode of the T1; a drain electrode of the T1 is connected with a drain electrode of the T2 and a source electrode of the T3; a source electrode of the T2 and a source electrode of the T7 are connected with the first power line; a drain electrode of the T3 is connected with a drain electrode of the T4 and a source electrode of the T5; a drain electrode of the T5 is connected with an anode electrode of the organic light emitting diode; a grid electrode of the T3 and a drain electrode of the T6 are connected with a first end of the storage capacitor; a drain electrode of the T7 and a drain electrode of the T8 are connected with a second end of the storage capacitor; a source electrode of the T8 is connected with the reference voltage; a source electrode of the T6 is connected with the second power line; a grid electrode of the T6 is connected with a first scanning control line; grid electrodes of the T2, the T5 and the T7 are connected with a control line; and grid electrodes of the T1, the T4 and the T8 are connected with a second scanning control line. The pixel circuit disclosed by the invention has the advantages that threshold shift of the driving transistors and the voltage fall of the power lines can be compensated, so that the brightness of the display is more uniform.