A tempo detection and display system, a musical practice and mastery system, a musical aid, a disc jockey aid, processes, and method of use are presented. The present disclosure is configured to provide measurements and display these measurements, and in particular display via nixie tubes. The measurements configured of and/or interpreting an external audio signal. Additionally, the system is configured to measure and display dB SPL; decibel of sound pressure level, also referred to as dB SPL, decibel of sound pressure level or decibel sound pressure level. To switch what parameter is being displayed, a 3-state toggle switch; or toggle switch or toggle, which is located on the main body.

An LED lamp comprising: a plurality of LED strings, each LED string comprising a plurality of LEDs; a plurality of constant current circuits for powering the plurality of LED strings, wherein one constant current circuit is provided for each LED string; a plurality of shift registers for controlling the operation of the plurality of constant current circuits, wherein at least one shift register is provided for each LED string; and a microprocessor for supplying timing pulses to the plurality of shift registers for controlling operation of the plurality of constant current circuits, the timing pulses comprising a plurality of serial bit streams.

In various embodiments, a light-emitting device may be provided including an active structure including a halide perovskite layer. The light-emitting device may further include a first injection electrode and a second injection electrode electrically coupled to the active structure. The light-emitting device may additionally include a control electrode, and an insulator layer between the control electrode and the active structure. The first injection electrode may be configured to inject electrons into the active structure and the second injection electrode may be configured to inject holes into the active structure upon application of a potential difference between the first injection electrode and the second injection electrode. The control electrode may be configured to generate an electric field upon application of a voltage, thereby causing accumulation of the electrons and the holes in a region of the halide perovskite layer so that the electrons and the holes recombine, thereby emitting light.

It is an object to provide a specific driving method for reduction in power consumption in displaying a 3D image with field sequential driving. A driving method of a liquid crystal display device is a method in which a stereoscopic image can be perceived with a liquid crystal display device switching an image for a left eye and an image for a right eye to display the image for the left eye or the image for the right eye, and a pair of glasses having a switching means with which the image for the right eye and the image for the left eye are switched in synchronization with display of the image for the left eye or the image for the right eye in order that the left or right eye of a viewer may selectively perceive the image for the left eye or the image for the right eye; the image for the left eye and the image for the right eye are perceived by the left eye or right eye in a mixed color by switching light which is emitted from a backlight portion and which corresponds to a plurality of colors, within a predetermined period, and the light which is emitted from the backlight portion are continuously emitted in accordance with an image signal of each of a plurality of colors which forms the image for the left eye and the image for the right eye.

Disclosed herein is a display device including: a pixel array portion; a drive portion; and a power source wiring; the pixel array portion, at least a part of the drive portion configured to drive the pixel array portion and the power source wiring are forming a panel, the pixel array portion including scanning lines disposed in rows, signal lines disposed in columns, and pixels disposed in matrix in portions where the scanning lines and the signal lines cross each other, respectively, the drive portion including a scanner portion configured to drive the pixels in a line-sequential manner through the scanning lines, and a signal portion configured to supply a video signal to each of the signal lines in correspondence to the line-sequential drive, so that an image is displayed on the pixel array portion.

Provided are systems and methods for a graduation cap with a wirelessly controlled cold-cathode tube matrix display capable of displaying text and complex pictorial representations. The graduation cap is comprised of a series of interconnected modules atop a circuit-board base plate affixed to the upper surface of a mortarboard or similar. A remote computing device transmits control signals via a text submission or pictorial representation program over a network to a communications module. The processing module processes the received signals to drive a cold-cathode tube matrix display. The processing module is further supported by an animation program and memory module. Also discussed are a swappable battery, power module, and high-voltage power supply module to support the requisite electronics. This invention enables an interactive and mobile approach to vintage alphanumeric cold-cathode display tubes to celebrate graduating students.

Provided are systems and methods for a graduation cap with a wirelessly controlled cold-cathode tube matrix display capable of displaying text and complex pictorial representations. The graduation cap is comprised of a series of interconnected modules atop a circuit-board base plate affixed to the upper surface of a mortarboard or similar. A remote computing device transmits control signals via a text submission or pictorial representation program over a network to a communications module. The processing module processes the received signals to drive a cold-cathode tube matrix display. The processing module is further supported by an animation program and memory module. Also discussed are a swappable battery, power module, and high-voltage power supply module to support the requisite electronics. This invention enables an interactive and mobile approach to vintage alphanumeric cold-cathode display tubes to celebrate graduating students.

A gate driving circuit may include a gate signal generating circuit configured to sequentially output at least one gate signal having a square wave pulse, and a ramp voltage generating circuit configured to receive the at least one gate signal and a slope data voltage to output a ramp voltage signal including a ramp waveform based on the square wave pulse of the at least one gate signal and on the slope data voltage.