1147results 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.

The invention provides a three-dimensional terrain model real-time smooth drawing method with combination of a GPU technology, and belongs to the technical field of image processing. The objective of the invention is to provide the three-dimensional terrain model real-time smooth drawing method with combination of the GPU technology so that cache reuse in multiple times of drawing can be realized based on the current popular programmable GPU technology with a global digital elevation model acting as a data source, and load of computation space is effectively reduced. The method comprises the steps of construction of a multi-resolution pyramid model, elimination of image noise points, filtering of images, partitioning of planar projection of the earth according to equal latitude and longitude, and construction of different hierarchical levels of pyramid layers according to a mode from the top to the bottom. Acceleration and enhancement of terrain rendering are realized based on the programmable GPU technology, i.e. all phases of a graphical drawing pipeline are controlled by using shader languages, two and textures are respectively generated by vertex information and index information of elevation data to be stored in video memory for scheduling of whole terrain drawing; and vertex interpolation and migration are performed in the geometric phase by utilizing a curved surface subdivision and fractal technology so that procedural details are generated and the phenomenon of edges and corners of the terrain mesh when resolution is insufficient can be compensated.

Provided is a liquid crystal display panel having gate drivers. The LCD panel includes a gate line shift circuit setting a gate line scanning order such that the gate lines are sequentially scanned in units of n gate lines with k-1 gate lines between each pair of adjacent gate lines in each unit according to an interleaving method in response to a gate line-on signal received from a timing control unit outside the LCD panel, wherein the LCD panel reproduces source data output from a source driver outside the LCD panel in the gate line scanning order set by the gate line shift circuit. The LCD panel inverts the polarity of a common voltage for every unit of n gate lines, instead of every gate line, thereby reducing power consumption. In addition, since every kth gate line is scanned according to the interleaving method, deterioration of image quality such as a flickering phenomenon can be prevented, which is an advantage of a line inversion driving method.

A light emitter driving device has a decoder portion which monitors a rectified voltage and generates a dimming signal, and a drive current control portion which controls a drive current to a light emitter according to the dimming signal. The decoder portion has a comparator which compares the rectified voltage with a predetermined threshold voltage to generate a comparison signal, a sampling counter which measures high-level and low-level periods of the comparison signal, a duty calculation portion which calculates the duty of the rectified voltage based on the output of the sampling counter, a filter calculation portion which excludes sporadic variation in duty by applying digital filtering to the output of the duty calculation portion, and a dimming signal generation portion which generates the dimming signal based on the output of the filter calculation portion.

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 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.

The present application relates to a computer having a processor configured to execute a set of instructions to render a customised version of a restricted document object model. A restricted element in a document object model is identified and at least one rule associated with the restricted element is accessed. The at least one rule is applied to the restricted element to generate a modified document object model which is then rendered. A related computer-implemented method is also covered by the present application. The present application relates to server-side authentication techniques; content filtering based on user-specific and context-based requirements; and audit trail techniques.

There is disclosed a photographic device that uses an image sensor and an electronic viewfinder. When a release button is pressed halfway, an aperture value, an electronic shutter speed and a photosensitivity are decided based on the present subject brightness to provide a proper exposure value for photographing a still image. So long as the release button is kept being pressed halfway, a timing generator drives the image sensor to shoot video images at a frame rate of 20 Hz, and the aperture value decided for still image photography is fixed, whereas the electronic shutter speed and the photosensitivity are adjusted according to the subject brightness by use of an aperture-priority type video program. When the release button is pressed to the full, an exposure for a still image is done with the fixed aperture value.

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.

Image depth augmentation system and method for providing three-dimensional views from a two-dimensional image. Depth information is assigned by the system to areas of a first image via a depth map. Foreground objects are enlarged to cover empty areas in the background as seen from a second viewpoint at an offset distance from a first viewpoint of the first image. The enlarged objects are used to regenerate the first image and to generate the second image so that empty background areas are covered with the enlarged foreground objects. The resulting image pair may be viewed using any type of three-dimensional encoding and viewing apparatus. Can use existing masks from non-3D projects to perform depth augmentation and dither mask edges to provide for realistic soft edges for depth augmented objects.

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.

The invention discloses an LED drive circuit having a silicon controlled rectifier regulator, a circuit module, and a control method. Before conduction of a silicon controlled rectifier regulator, a direct-current bus voltage is controlled by a bleeder circuit to change in a predetermined manner, so that a phenomenon that conduction points of the silicon controlled rectifier regulators are affected because of inconformity of leakage currents due to different types of the silicon controlled rectifier regulators and different circuit setting and thus a problem of LED scintillation can be solved. Meanwhile, with control of the direct-current bus voltage, the voltage of the silicon controlled rectifier regulator after conduction can be affected, so that the voltage of the conduction point can be set flexibly based on needs.

An illumination device comprising a plurality of light emitting diodes (LEDs) and a method for controlling the illumination device while avoiding flicker in the LED output is provided herein. According to one embodiment, the method may include driving the plurality of LEDs substantially continuously with drive currents configured to produce illumination, periodically turning the plurality of LEDs off for short durations of time during a first period to take measurements or communicate optical data, and increasing the drive currents supplied to the plurality of LEDs by a small amount when the LEDs are on during the first period to compensate for lack of illumination when the LEDs are periodically turned off during the first period.

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 present invention provides a method and device to realize equipment status polling, periodicity transmitting polling request to equipment, detecting equipment connection state according to whether receiving equipment response in overtime period. Said method includes dividing polled equipment into plurality of equipment groups; originating polling request to equipment in current equipment group, centralizing waiting receiving current equipment group equipment response within overtime period, when overtime period is up, originating polling request to equipment in next equipment group until said waited equipment all having polled. The present invention effectively shortens polling period, in time reflecting equipment state, and reducing CPU use rate, through grouping and in turn asynchronization polling mode. On the other hand the present invention avoids equipment flash off state through centralizing repeating polling to detecting discontinuous equipment, raising equipment status detective accuracy.

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 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.

Disclosed is an anti-dazzling laminate which has anti-dazzling properties and can realize excellent glare preventive properties and black color reproducibility (gradation rendering of black color at low brightness). The anti-dazzling laminate is an optical laminate comprises a light transparent base material and an anti-dazzling layer provided on the light transparent base material, wherein the outermost surface of the anti-dazzling layer has a concavoconvex shape, and the optical laminate satisfies the following requirements: Ha is more than 0% and less than 90%, Hi is more than 0% and less than 90%, and Hi / Ha is not less than 0.8 and less than 1.0, wherein Ha represents the whole haze value of the optical laminate; and Hi represents the internal haze value of the optical laminate.

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 driving method of a display panel. The display panel comprises a plurality of pixel groups, wherein each pixel group comprises two pixel units arranged adjacently along a first direction; each pixel unit comprises sub-pixels arranged adjacently along a first direction; and a driving method of the display panel comprises the following steps: applying a driving voltage with opposite polarity to the two pixel units in the same pixel group; applying a driving voltage with opposite polarity to two adjacent pixel units; applying a driving voltage with same polarity to the sub-pixels in the same pixel unit; and separately applying a driving voltage with different voltage grades to the sub-pixels in two adjacent pixel units. The invention also discloses a driving apparatus of the display panel and a display apparatus. By adopting the display method of the display panel, the driving apparatus of the display panel and the display apparatus, the display effect of the display panel can be improved.

The invention relates to a liquid crystal display panel and a drive method thereof. The liquid crystal display panel comprises a plurality of pixels in matrix distribution, a plurality of grid scanning lines providing scanning signals for each row of pixels, and a plurality of data wires providing data signals for each list of pixels; the grid scanning lines are connected with a grid driver, the data wires are connected with a data driver, and the grid driver and the data driver are driven by a time schedule controller; wherein, the liquid crystal display panel also comprises a list of virtual pixels and a voltage comparator; the voltage comparator comprises a first input end, a second input end and a feedback output end; the first input end and the second input end are connected with the virtual pixels, and the feedback output end is connected with the data driver. The liquid crystal display panel and the drive method provided by the invention can avoid flicker and photogene caused by feedthrough voltage by adjusting the data wire voltage output by each pixel.

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.

An image processing apparatus includes a storing unit for storing, in a storage medium, image data of an image to be displayed on a display unit; a rendering unit for rendering characters in a character rendering region specified on the image; and a controlling unit for performing display control processing. When characters are superimposed on an image and the resulting image is displayed, image data of a region of the image, the region being corresponding to the character rendering region, is stored in the storage medium, the characters are rendered to the image data of the image, the resulting image is displayed on the display unit, and then the image data saved in the storage medium is rendered back to the image data of the displayed image. This arrangement can restrain increases in the amount of memory used and processing load and can prevent the flickering of displayed characters.

The invention provides a backlight driving method and a backlight module as well as a television. On regional backlight controlled display equipment, a plurality of backlight source units are respectively corresponded to multiple areas of a display panel, and each regional backlight can be independently controlled. The gray level values of the first many frames of image signals of a displayed image in each area are stored in a buffer, then the gray levels of the first many frames of image signals and the gray level of the current frame of an image signal in the area are subjected to weighted mean processing, and a first gray level value of the display area is obtained. The first gray level value is provided with a plurality of image signals subjected to the weighted mean processing, thus the gray level value change of the image signal of the current frame has less effect on the first gray level value with the weighted mean. Since the first gray level value is used for controlling the backlight brightness of the area, the effect on the backlight brightness of the area is less, and the problem that the blinking sensibility of backlight caused by that the backlight brightness changes greatly along with the great change of the gray level value on the images of the front frame and the rear frame is prevented.

A pixel circuit includes a lighting element, a driving signal generating unit and a switching unit. The driving signal generating unit compares a data signal with a reference signal so as to generate a PWM driving signal. The status of the PWM driving signal is determined according to the comparing result of the data signal and the reference signal. The switching unit is electrically connected to a power source and the lighting element, and generates a driving current to drive the lighting element to emit light according to the PWM driving signal.