1134results about How to "Avoid flickering" patented technology

A programmable LED constant current driver circuit for driving LEDs at constant current and dimming the LEDs using standard, off-the-shelf dimmers is provided. The current driver circuit of the present disclosure includes a temperature compensation feature which controls the on time for the LEDs based on a measured temperature of the current driver and associated circuits. In another embodiment, the current driver circuit is designed to receive a 24 VAC input and drive one or more LEDs in a transformer-based system dimming system.

A digital micro-mirror device (DMD) format conversion system for outputting a stereoscopic encoded optical signal using a DMD and a color wheel is provided. The DMD format conversion system includes a 3D data formatter for receiving an input signal and a DMD data formatter for receiving an output signal having stereoscopic image information and control information from the 3D data formatter and for outputting a DMD output signal having stereoscopic image information and control information. A color wheel control signal and output digital micro-mirror device data are synchronized based on an output frame rate generated by the 3D data formatter independent of the original input frame rate.

The invention has two main embodiments, a first called column switching and blanking and a second embodiment called doubling. The first embodiment is a projector for displaying a stereoscopic image with projector using one or more digital micromirror devices positioned into a plurality of columns and rows. The projector itself includes a light source, an optical system, a video processing system and a data system for driving the micromirror devices. The data subsystem provides separate data to a plurality of column pairs of the micromirrors. The projector includes a stereoscopic control circuit having a first state of the control circuit for inputting a first eye view of the stereoscopic image and causing the micromirrors of a first column of each column pair to be in various on and off states during said first eye view of said stereoscopic image and for causing all of said micromirrors of a second column of each column pair to be in an off state during said first eye view of said stereoscopic image. A second state of the control circuit is used for inputting a second eye view of the stereoscopic image and causes the micromirrors of the second column of each column pair to be in various on and off states during the second eye view of the stereoscopic image and for causing all of the micromirrors of the first column of each column pair to be in an off state during the second eye view of said stereoscopic image. The second embodiment is a projector for displaying a stereoscopic image with the projector using one or more digital micromirror devices positioned into a plurality of columns and rows. The projector includes a light source, an optical system, a video processing system and a data system for driving said micromirror devices. The data subsystem provides separate data to a plurality of column pairs of the micromirrors. The projector includes a stereoscopic control circuit having a first state for inputting a first eye view of the stereoscopic image and causing each micromirror of each column pair to be in various but identical on and off states during said first eye view of said stereoscopic image. A second state of the control circuit for inputs a second eye view of the stereoscopic image and causes each micromirror of each column pair to be in various but identical on and off states during the second eye view of the stereoscopic image.

A liquid crystal display device includes a liquid crystal display panel including a plurality of data lines to which a data voltage is supplied, a plurality of gate lines to which a gate pulse is supplied, and a plurality of liquid crystal cells, a data drive circuit to invert a polarity of the data voltage in response to a polarity control signal and to output the data voltage to the data lines in response to a source output enable signal, a gate drive circuit to supply the gate pulse to the gate lines, and a POL/SOE logic circuit to invert the polarity control signal for every frame period except at Nth-multiple frame period (where N is a positive integer), wherein the POL/SOE logic circuit controls the polarity control signal at every Nth-multiple frame period such that the polarity of the data voltage is the same as the previous frame period and controls a pulse width of the source output enable signal at every Nth-multiple frame period to be longer than for the other frame periods.

A display device with integrated touch screen is provided. The display device may include a panel and a touch IC. The panel may include a plurality of driving electrodes and sensing electrodes. The touch IC may apply a driving pulse to the driving electrodes and receive a plurality of sensing signals from the sensing electrodes to determine whether there is a touch when the panel operates in a touch driving mode, and, when the panel operates in a display driving mode, the touch IC may apply a common voltage to the plurality of driving electrodes and sensing electrodes. The touch IC may include a sensing unit sensing whether there is a touch by use of a touch sensing reference voltage applied to the sensing unit and having the same level as a minimum voltage of the driving pulse.

Provided is a driver for a display apparatus and a display apparatus having the same. The driver includes a plurality of gate lines that transmit gate signals, and first and second gate drivers that are respectively connected to odd-numbered and even-numbered gate lines among the plurality of gate lines and generate the gate signals based on a plurality of clock signals, wherein two adjacent clock signals among the plurality of clock signals have a phase difference equal to or greater than 180° and less than 360°. Accordingly, voltage drop caused by a kickback voltage occurs only one time by allowing two adjacent clock signals to have a predetermined time delay from each other, so that a positive data voltage is the same as a negative data voltage, thereby preventing flicker or stain.

A power source module for a LED lamp includes a filament-simulating circuit, a current limiting circuit, a rectifier, a filter, and a discharging circuit electrically connected to each other and a LED in the LED lamp. The filament-simulating circuit simulates a filament before the LED to pass through the pre-heating process of the electrical ballast in a fluorescent lamp base. The current limiting circuit, the rectifier, and the filter limit, rectify and filter the current from an external power source in the fluorescent lamp base to output a high frequency, direct current to drive the LED. The discharging circuit discharges the energy after turning the power switch off to prevent the LED lamp from flicker. Therefore, the power source module enables the LED lamp to be installed on the traditional fluorescent lamp base without modifying the circuit in the base.

The invention discloses a control method and device of a light ring. According to change of shutter time and change of a gain value, the light ring of an adjustment lens is controlled so as to be adaptive to versatile demands of an application scene. The control method of the light ring comprises the following steps of acquiring current environment brightness, the shutter time of the lens and the gain value during exposure; adjusting the shutter time and the gain value in an automatic exposure mode when the difference between the current environment brightness and the preset target brightness is determined to exceed a preset threshold interval; and controlling the light ring of the adjustment lens according to the change of the shutter time and the change of the gain value.

A gamma reference voltage generating device and a gamma voltage generating device are provided herein. The gamma reference voltage generating device includes a reference voltage source and a selector. The reference voltage source has a first terminal and a second terminal respectively coupled to a first adjustable voltage and a second adjustable voltage for providing a plurality of reference voltages. The selector selectively outputs one of the reference voltages as a gamma reference voltage according to a selecting signal. By regulating the first and the second adjustable voltage, the range of the reference voltages provided by the reference voltage source can be adjusted so as to adjust the gamma reference voltage and the outputted voltage resolution.

The invention discloses a display panel and a display device, and relates to the technical field of display. A display area of the display panel is provided with an arc boundary; the display panel includes a plurality of gate lines and a plurality of data signal lines, in the display area, the gate lines extend in a first direction and are distributed in a second direction, and all the data signallines are distributed in the first direction and extend in the second direction; a non-display area is provided with a plurality of gate driving circuits, and each gate driving circuit comprises a plurality of cascaded shift registers electrically connected with the corresponding gate lines respectively; the non-display area is further provided with a first circuit placement area located at the side, away from the display area, of the arc boundary; in the non-display area at the arc boundary, the gate lines led out from the shift registers wind from one side of the first circuit placement area to the display area; in the non-display area at the arc boundary, the data signal lines are located between the first circuit placement area and the display area. According to the scheme, the improvement of the display effect of the display panel and the display device is facilitated.

The invention relates to a liquid crystal panel and a display device containing the same, wherein, the liquid crystal panel comprises a plurality of pixel units; each pixel unit comprises a gating line, a data line, a pixel electrode and a first switch element; the common electrode of a first pixel unit and a second pixel unit is connected to a first common line and a second common line respectively by a second switch element in the pixel units at the same line of the liquid crystal panel, wherein, the first common line is connected to a first common voltage, the second common line is connected to a second common voltage, the first common voltage and the second common voltage are AC voltage, and the voltage levels in the same frame are opposite; meanwhile, the first switch element and the second switch element are equivalently designed thin-film transistors. The liquid crystal panel of the invention can reduce the power consumption of a source driver and improve the quality of images.