410results about How to "Consistent brightness" patented technology

The invention discloses a pixel circuit, a driving method of the pixel circuit and an organic electroluminescence display panel. A first node and a second node are reset in the initialization phase through a first switching transistor and a seventh switching transistor included in a node initialization module so that the difference caused by parasitic capacitance of the two nodes can be avoided. The gate electrode of a driving transistor is electrically connected with the first node. The source electrode of the driving transistor is electrically connected with the second node. The driving transistor is reset in the initialization phase so that the problem of threshold grabbing inconsistency caused by voltage jump can be avoided, and the brightness of the first frame after high and low grayscale switching is ensured to be consistent. Besides, the driving transistor is completely reset in the initialization phase of each frame so that the ghost phenomenon caused by deviation of the threshold voltage of the driving transistor can be prevented.

Described herein are systems and methods that integrate the injection of contrast agents with imaging catheters. In an embodiment, an imaging catheter comprises a catheter sheath and an imager, e.g., ultrasound transducer. The imaging catheter further comprises a contrast lumen having one or more exit ports for injecting contrast agent into the patient. The contrast lumen extends along the catheter sheath and may be external to or integrated into the catheter sheath. Preferably, the exit port of the contrast lumen is positioned along the catheter sheath at a relatively short known distance from the imager. The catheter may include multiple contrast lumens for injecting different types of contrast agents. In an embodiment, a synchronizing controller is provided to automatically synchronize the injection of contrast agent with imaging. In another embodiment, drug-filled microbubbles in combination with ultrasound imaging are used to deliver a controlled drug dose to a specific treatment site.

The present invention discloses a pixel circuit, a driving method thereof, a display panel and a display device. According to the present invention, before a light-emitting device emits light, an initialization module provides the signals at a reference signal end to the grid and the second pole of a driving transistor separately, provides a signal at a first voltage end to the first pole of the driving transistor, and is utilized to reset the grid and the first pole of the driving transistor separately, so that the difference caused by the parasitic capacitances of the grid and the first pole is avoided, and further the problem that due to the voltage jump, the threshold values are captured inconsistently, is avoided, and accordingly, the consistent brightness of a first frame after the high and low gray-scale switching can be guaranteed. Moreover, the second pole of the driving transistor is reset at the initialization stage of each frame, so that a large current flows through the driving transistor, and the threshold-voltage excursion of the driving transistor caused by the bias stress is forced to recover, and accordingly, a persistence of vision phenomenon is avoided.

The invention belongs to the technical field of light source illuminating and electronics, in particular relates to an intelligent general light-emitting diode (LED) street lamp illuminating power supply system. The system comprises an input surge protection and electromagnetic interference suppressing circuit, a BOOST-BUCK isolation backlash power factor correction switch power circuit, an LED chip temperature detection circuit, an ambient brightness detection circuit, a permanent calendar chip, a peripheral circuit, an LED failure detection circuit, a singlechip circuit and a constant-current output control circuit. In the switch power circuit of the invention, a circuit structure is simplified and circuit efficiency is improved based on an active power factor correction (PFC) control chip L6562,; and the singlechip circuit monitors the ambient brightness, the temperature of the LED chip, time and LED fault in real time by taking a chip STC12C5606AD as a control core and intelligently adjusts the output brightness of the LED according to different situations, so that energy is saved and the service life of an LED street lamp is prolonged effectively at the same time.

A method and apparatus for generating a two-dimensional output image of a slab multi-planar reformatting (MPR) volume data set from a selectable view point and view direction is described. The method comprises factorising a view transform matrix into an intermediate transform matrix and a warp transform matrix. The intermediate transform matrix is such that voxels in the volume data set map to pixels in an intermediate image in which neighbouring voxels in a plane of the volume data set which is most parallel to tie plane of the output image are separated by an integer number of pixel along each of tie axes of the intermediate image. The intermediate transform matrix is applied to the data set to provide an intermediate data set. A projection of the intermediate data set along the view direction is performed according to a desired projection algorithm to provide the intermediate image. The wrap transform matrix is then applied to the intermediate image to provide the output image.

The invention provides a compensation method for a flat display panel large-viewing-angle Mura area. The compensation method for the flat display panel large viewing angle Mura area includes the following steps: 1. providing a flat display panel which comprises a plurality of main pixels, wherein the flat display panel comprises a Mura area and normal areas; 2. setting two or more main pixels in the Mura area as a group of Mura area brightness control unit; 3. providing a drive circuit which drives the flat display panel, wherein the drive circuit provides a plurality of gamma voltages; and 4. utilizing the drive circuit to apply two or more types of gamma voltages on the plurality of main pixels in each group of Mura area brightness control unit to enable a gray scale coefficient of the front-viewing-angle and large-viewing-angle Mura to approach to a gray scale coefficient of the normal area, and the brightness of the whole flat display panel is consistent. According to the compensation method for the flat display panel large-viewing-angle Mura area, the gray scale coefficients of the Mura area at various viewing angles are enabled to approach to the gray scale coefficient of the normal area, and flat display panel production yield is improved.

The invention discloses a projector array splicing display method. The method comprises the following steps that 1), a transformation matrix is calculated, point coordinates of standard black and white chessboard features are collected through a camera, the transformation matrix from coordinate systems of projected images to coordinate systems of screen images is calculated, and a pre-correction matrix is calculated; 2), edges of the projected images are fused, sampling is carried out on overlap areas of every two adjacent projected images according to cosine functions, fusion coefficients of the images of the overlap areas are obtained, and pixel RGB values of the overlap areas are multiplied by the corresponding fusion coefficients to obtain the effect of seamless splicing of every two adjacent protected images; 3), geometric correction is carried out, the pre-correction matrix is used for carrying out perspective transformation on the images after the edges are fused and processed, and the final projected images are the images after geometric correction; 4), a plurality of the projected images are spliced, according to the methods in steps from one to three, every two adjacent projected images are spliced through a projector array according to the sequences from top to bottom and from left to right, and finally display of the spliced image of the whole projector array is obtained.

The invention provides a system for converting RGB three colors (red, green and blue) to RGBW four colors (red, green, blue and white). The system comprises an input unit, a processing unit and a control unit, wherein the input unit is used for inputting the gray value of R, G and B; the processing unit is used for converting the gray value of R, G and B received by the input unit into the gray value of R, G, B and W and outputting the gray value; and the control unit is used for receiving the output value of the processing unit and controlling the execution of LED equipment according to the output value. The system for converting three colors to four colors ensures the complete consistency of the saturation and the brightness of mixed light, has low power and saves energy, and additionally, the service life of the system is prolonged because the heat productivity of hardware is low.

The invention relates to the field of display technologies and discloses an automatic regulating method for the backlight brightness of a splicing screen. The method comprises the steps that backlight brightness values of a plurality of display screens are detected; the backlight brightness values of the display screens are compared, and the benchmark display screen and the display screens to be regulated are set; the backlight brightness value of the benchmark display screen is subtracted from the backlight brightness values of the display screens to be regulated, so that actual brightness difference values are obtained; the actual brightness difference values are converted into pulse width modulation signal difference values, and the pulse width modulation signal difference values are subtracted from to-be-regulated pulse width modulation signal values, so that regulation pulse width modulation signal values are obtained; backlight modules of the display screens to be regulated receive and execute the corresponding regulation pulse width modulation signal values. The invention further provides an automatic regulating device for the backlight brightness of the splicing screen and the splicing screen.

This invention relates to a back light module set including a light source and a light guiding board comprising an exit surface, a base surface and at least an entrance surface, among which, the exit surface is set opposite to the base, said entrance surface is connected with said exit and the base surface, multiple transmission diffraction grating units are set on the exit surface, each one includes two zones arrayed vertically, the first zone is arrayed vertical to the direction of the nearest emit point connected with this place, the second zone grating array direction is vertical to that of the first zone.

The present invention provides a high-speed image acquisition and processing system. The system comprises a beam splitter prism, two CCD cameras, a camera adjusting device and an FPGA. The beam splitter prism is used for splitting incident light into two sub light beams to respectively enter the two CCD cameras. The camera adjusting device is used for adjusting the spatial positions of the two CCD cameras. The FPGA includes a camera timing control unit, an image synthesis unit and an image pre-processing unit. The camera timing control unit is used for sending pulse control signals, via two triggering wires, to the two CCD cameras to control the two CCD cameras to be triggered by time and make exposures at different times for acquiring images. The image synthesis unit combines the images of the two CCD cameras into a continuous image. The image pre-processing unit is used to pre-process the image. The high-speed image acquisition and processing system of the present invention achieves high-frequency image acquisition with low-frequency image sensors, so that the device cost is significantly lowered, the image collection acquisition is increased, and the system is particularly suitable for image acquisition and processing of high-speed moving object measurement.

The invention relates to an organic light emitting diode display device and an organic light emitting diode pixel circuit thereof. The pixel circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a capacitor and an organic light emitting diode, wherein one of source/drain electrodes of the first transistor is suitable for receiving display data, and the other source/drain electrode is coupled with one of source/drain electrodes of the fourth transistor and is coupled with a grid electrode of the second transistor and one of source/drain electrodes of the third transistor through the capacitor; one of source/drain electrodes of the second transistor is coupled with the other source/drain electrodes of the third transistor and the fourth transistor and is coupled with one of source/drain electrodes of the fifth transistor; the other source/drain electrode of the fifth transistor is coupled with a first power supply voltage; the anode and the cathode of the organic light emitting diode are respectively coupled with the other source/drain electrode of the second transistor and a second power supply voltage; and the second power supply voltage is smaller than the first power supply voltage.

The invention discloses a 3D panorama parking assistance system and belongs to technologies applied to the field of automobile safety aided driving. The 3D panorama parking assistance system comprises a camera input module, an image correcting module, a three-dimensional projection module, an image splicing module and an image display module. The system shows the conditions around an automobile to a driver truly through a three-dimensional image, so that safety in the automobile parking process is improved. According to the system, a plurality of machine vision and digital image processing algorithms are integrated and combined with multiple advanced technologies of the machine vision field, so that the automobile parking process is higher in safety.

The invention discloses a colorful filter plate and a liquid crystal display panel. The colorful filter plate comprises a transparent substrate, a patterned shade layer, and colorful filtering units. The patterned shade layer is arranged on the transparent substrate and is provided with a plurality of filtering regions. Each colorful filtering unit is corresponding to each filtering region. Areas of the plurality of filtering regions are not all the same. The colorful filter plate can make brightness of each sub pixel unit maintain consistent through a method of compensating filtering region transmittance, so as to eliminate a problem of color cast of images.

The related color filter array interpolation device comprises: a horizontal/vertical interpolation unit to calculate RGB component interpolation of pixel point (m, n) according to original measured data, a horizontal/vertical brightness and color distance calculation unit to calculate the brightness and color distances of point (m, n) and its near point, a distance comparison unit to determine the direction with less distance, and a selective output unit to output the interpolation with less distance as final value. This invention is benefit to obtain clear image.

The invention provides a liquid crystal display panel. The liquid crystal display panel comprises a first substrate and a second substrate which are oppositely arranged, a liquid crystal layer sandwiched between the first substrate and the second substrate, and a plurality of pixel units P. Each of the pixel units P comprises a display region and a view angle control region. The area of the view angle control region is at least 1/4 of the area of the pixel unit P. The view angle control region is provided with a view angle control electrode. The view angle control region does not generate an electric field, and the liquid crystal display panel is displayed at a wide view angle when the view angle control electrode is not applied with a voltage. The view angle control region generates a vertical electric field, and the liquid crystal display panel is displayed at a narrow view angle when the view angle control electrode is applied with a view angle control voltage. The invention also relates to a display device.

The invention relates to a driving substrate and a display panel. The substrate comprises a special-shaped driving region; the special-shaped driving region comprises a special-shaped display drivingregion and a special-shaped non-display driving region; multiple first pixel driving units are positioned in the special-shaped display driving region, and the multiple first pixel driving units are arranged on the substrate; multiple first signal lines are arranged on the substrate; each first signal line is used for being electrically connected to multiple first pixel driving units in one firstpixel driving unit line; multiple first virtual pixel driving units are arranged around the edge of the special-shaped display driving region; the first signal lines are electrically connected with multiple first pixel driving units in one first pixel driving unit line through at least one first virtual pixel driving unit; and the first signal lines are connected with at least one first virtual pixel driving unit and then connected with at least one first pixel driving unit in series, so that load of the first signal lines can be improved.

Methods for optimizing gain of an ultrasound image may include: acquiring a tissue image and a first noise image under a same imaging condition; de-noising the tissue image by the first noise image to obtain a de-noised tissue image; identifying a tissue region in the de-noised tissue image; determining whether a percentage of the tissue region in the de-noised tissue image exceeds a preset threshold condition; selecting, according to the determination result, a corresponding calculation method to calculate a first master gain and a first time gain compensation (TGC) curve for the tissue image; and applying the first TGC curve and the first master gain obtained through calculation to the tissue image acquired before.