414results about How to "Consistent brightness" patented technology

Providing a light emitting device capable of suppressing the variations of luminance of OLEDs associated with the deterioration of an organic light emitting material, and achieving a consistent luminance. An input image signal is constantly or periodically sampled to sense a light emission period or displayed gradation level of each of light emitting elements of pixels and then, a pixel suffering the greatest deterioration and decreased luminance is predicted from the accumulations of the sensed values. A current supply to the target pixel is corrected for achieving a desired luminance. The other pixels than the target pixel are supplied with an excessive current and hence, the individual gradation levels of the pixels are lowered by correcting the image signal for driving the pixel with the deteriorated light emitting element on as-needed basis, the correction of the image signal made by comparing the accumulation of the sensed values of each of the other pixels with a previously stored data on a time-varying luminance characteristic of the light emitting element.

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.

The invention discloses a liquid crystal panel driving method and device. The method comprises the steps of establishing a position lookup table about all sub-pixels, wherein a first numerical value and a second numerical value are set in the position lookup table, the first numerical value indicates that the sub-pixel at a corresponding position does not need gray scale compensation, and the second numerical value indicates that the target sub-pixel at a corresponding position needs gray scale compensation and also indicates the position of a referential benchmark sub-pixel during gray scale compensation; establishing a compensation lookup table, and setting a post-compensation gray scale value of the target sub-pixel according to the one-to-one corresponding relation between the current gray scale value of the target sub-pixel and the gray scale value of the benchmark sub-pixel; determining the target sub-pixel needing gray scale compensation according to the position lookup table and acquiring a corresponding benchmark sub-pixel when a liquid crystal panel is driven for display, acquiring a post-compensation gray scale value from the compensation lookup table according to the current gray scale value of the target sub-pixel and the gray scale value of the benchmark sub-pixel, and driving the target sub-pixel for display according to the post-compensation gray scale value.

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 invention provides a partition driving processing method, a processing device and a displayer. Different kinds of partition compensation and promotion of the simulation reference voltage are carried out through the partition Gamma Table, all-directional Gamma compensation in the perpendicular direction is achieved, the consistent luminance of a picture in the perpendicular direction is achieved, accordingly, the problem of up-and-down picture undercharging picture luminance uniformity caused by the fact that up-and-down signal delay of a 4K2K display screen is large is solved, and the problem of up-and-down crosstalk of the picture under a 3D mode is solved.

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 discloses an LED display screen correction system comprising a box body parameter obtaining device, a data processing device, a control device and an LED box body which are sequentially connected, and a target parameter input device connected with the data processing device; the box body parameter obtaining device is used for obtaining the average brightness of an LED box body display area and / or the current parameter of color coordinate parameters; the target parameter input device is used for inputting the target parameter of the LED box body on the demand of a user; the data processing device is used for generating the adjustment coefficient of the LED box body according to the current parameter and the target parameter; the control device is used for receiving and storing the adjustment coefficient, adopting the same adjustment coefficient for brightness and / or color correction for each pixel in the display area according to the adjustment coefficient, obtaining the control data of the LED box body, and controlling the LED box body to display; and through correction, the purposes of consistent brightness and consistent color of all box bodies in different batches are achieved.

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 pixel circuit, a driving method of the pixel circuit, an organic light-emitting display panel and a display device. A unified public voltage signal is inputted to a first electrode of a drive transistor before a data signal is written into a control electrode of the drive transistor; the public voltage signal and a threshold voltage of the drive transistor are written into a control electrode of the drive transistor, so that relatively high current can pass through the drive transistor, threshold voltage deviation, which is caused by bias stress, of the drive transistor can be recovered, a retarding effect of the drive transistor can be improved and the occurrence of a ghosting phenomenon can be prevented; in addition, when the data signal is written into the control electrode of the drive transistor, a time of writing the data signal can be shortened, and the control electrode and the first electrode of the drive transistor can achieve jump through a unified potential, so that a difference, which is caused by stray capacitance between the control electrode and the first electrode of the drive transistor, can be prevented, the problem that threshold voltage grabbing is inconsistent due to voltage jump can be avoided and consistent brightness of the first frame after high-low grayscale switching can be guaranteed.

Providing a light emitting device capable of suppressing the variations of luminance of OLEDs associated with the deterioration of an organic light emitting material, and achieving a consistent luminance. An input video signal is constantly or periodically sampled to sense a light emission period or displayed gradation level of each of light emitting elements of pixels and then, a pixel suffering the greatest deterioration and decreased luminance is predicted from the accumulations of the sensed values. A voltage supply to the target pixel is corrected for achieving a desired luminance. The other pixels than the target pixel are supplied with an excessive voltage and hence, the individual gradation levels of the pixels are lowered by correcting the video signal for driving the pixel with the deteriorated light emitting element on as-needed basis, the correction of the video signal made by comparing the accumulation of the sensed values of each of the other pixels with a previously stored data on a time-varying luminance characteristic of the light emitting element.

Providing a light emitting device capable of suppressing the variations of luminance of OLEDs associated with the deterioration of an organic light emitting material, and achieving a consistent luminance. An input image signal is constantly or periodically sampled to sense a light emission period or displayed gradation level of each of light emitting elements of pixels and then, a pixel suffering the greatest deterioration and decreased luminance is predicted from the accumulations of the sensed values. A current supply to the target pixel is corrected for achieving a desired luminance. The other pixels than the target pixel are supplied with an excessive current and hence, the individual gradation levels of the pixels are lowered by correcting the image signal for driving the pixel with the deteriorated light emitting element on as-needed basis, the correction of the image signal made by comparing the accumulation of the sensed values of each of the other pixels with a previously stored data on a time-varying luminance characteristic of the light emitting element.

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 discloses a gain optimization method for ultrasound images. The gain optimization method comprises the following steps: acquiring a tissue image and data of a noise image under the same condition; performing de-noising processing on the tissue image by utilizing the noise image; identifying a tissue area in the tissue image; judging whether the proportion of the tissue area in the tissue image exceeds a set threshold condition or not; calculating the master gain and a TGC (time gain compensation) curve of the tissue image by selecting a corresponding method; enabling the TGC curve and the master gain to act on the tissue image. The gain optimization method for the ultrasound images provided by the invention is also suitable for various types of ultrasound images under conventional B-mode imaging and coherent contrast imaging, and not only is capable of guaranteeing the lossless display of information in the image but also meets the requirement that the optimized images are uniform and consistent in brightness. The invention also provides an ultrasound coherent contrast imaging gain optimization method and an ultrasound imaging automatic optimization device; compared with the prior art, the ultrasound coherent contrast imaging gain optimization method and the ultrasound imaging automatic optimization device are capable of enabling the different individual contrastographic images after subjected to gain optimization to be basically consistent in brightness, and therefore, the scanning efficiency of a doctor is greatly improved.

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 discloses an image enhancement method implemented through histogram equalization. The method comprises the following steps: a digital image required to be enhanced is input into the MATLAB software so as to obtain a matrix expression f (m, n); then, the average brightness value Y of the image f (m, n) is calculated, and the maximum value Kmax and minimum value Kmin of gray values K of pixels in all pixels of the image f (m, n) are calculated; according to the Kmax, the Kmin and the Y, an original image is divided into two subimages in gray intervals [Kmin, Y] and [Y, Kmax], and the average brightness values Y1 and Y2 of the two subimages in the gray intervals of [Kmin, Y] and [Y, Kmax] are calculated, and finally, the original image is divided into subimages in gray intervals [Kmin, Y1], [Y1, Y], [Y, Y2] and [Y2, Kmax]; and according to the gray value K of each pixel in the original image f (m, n), carrying out histogram equalization through a histogram equalization formula of a gray interval at which the pixel is located; and then a brightness preservation based enhanced image is output, wherein the output enhanced image is good in effect.

Providing a light emitting device capable of suppressing the variations of luminance of OLEDs associated with the deterioration of an organic light emitting material, and achieving a consistent luminance. An input video signal is constantly or periodically sampled to sense a light emission period or displayed gradation level of each of light emitting elements of pixels and then, a pixel suffering the greatest deterioration and decreased luminance is predicted from the accumulations of the sensed values. A voltage supply to the target pixel is corrected for achieving a desired luminance. The other pixels than the target pixel are supplied with an excessive voltage and hence, the individual gradation levels of the pixels are lowered by correcting the video signal for driving the pixel with the deteriorated light emitting element on as-needed basis, the correction of the video signal made by comparing the accumulation of the sensed values of each of the other pixels with a previously stored data on a time-varying luminance characteristic of the light emitting element.

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 an organic light-emitting display panel and a display device. The organic light-emitting display panel comprises a substrate, a plurality of light-emitting devices and a plurality of covering layers, wherein the light-emitting devices are positioned on the substrate, any light-emitting device is used for emitting light with single color, and each light-emitting device comprises a first electrode; the covering layers are positioned on the first electrodes of the light-emitting devices, the thickness of each covering layer changes along a first direction in a tapered manner, and the first direction is parallel to the plane where the substrate is. According to the thickness of the covering layer on light extracting rate, the covering layers with different thicknesses can be set at positions with different brightness, and the thickness tapered covering layers are set in the brightness tapered direction, so that the light extracting rate in the brightness tapered direction also changes in the tapered manner, the light extracting rate at relatively low positions can be improved, the effect of brightness uniformity during watching is reached, and the display uniformity problem of the organic light-emitting display panel is solved.

The invention discloses an automatic correction method for matching deviation of double-channel CCD images. The method comprises the following steps of: extracting a quantization value of an analog signal, setting a gain difference of an analog-to-digital converter, and adjusting the quantization value of the analog signal and the like. The method realizes automatic deviation correction function by calculating the deviation values of left and right channels according to the data value of the quantified analog signal, adjusting the gain difference of the analog-to-digital converter and adjusting the quantization value, solves the problem of deviation caused by electronic components, PCB wiring and a power supply system in circuit design of a double-channel CCD sensor, and ensures that the left and right images of the matched images have consistent brightness and chrominance. Moreover, the method is suitable for the conventional DSP-based high-definition network camera scheme, and the scheme can be realized only by using the method without changing the conventional hardware and circuits.

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 invention discloses a backlight module. The backlight module comprises a substrate, a light guide plate, a first column body, light sources, a spacer and an elastic component, wherein the light guide plate is arranged on the substrate; a light-emitting device of each light source is arranged toward a first side edge of the light guide plate; by the adoption of the spacer, a minimum distance is reserved between the first side edge of the light guide plate and the light-emitting device of each light source; at least part of the first column body is fixed on the light guide plate; a first end of the elastic component is connected to the end, which penetrates through a slit of the substrate, of the first column body; a second end of the elastic component is connected to the substrate; compared with the first end of the elastic component, the second end of the elastic component is further away from the first side edge of the light guide plate; and the elastic component pushes the first column body to drive the light guide plate to move toward the light sources until the distance between the light guide plate and the light emitting device of each light source reaches the minimum distance. The invention also discloses a liquid crystal display device. By the backlight module and the liquid crystal display device, the possibility that the distance of coupled light changes is reduced, and the luminance of the module is kept consistent with a design value well.

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 present invention relates to a uniformity correction method for the brightness of the part and the full screen of a panel display. The method comprises extracting the original brightness correction coefficient of each pixel of a broken part on the display screen from a correction database and carrying out gamma correction with the reciprocal of the coefficient. The result is multiplied by correcting white-field data displayed on the computer to shield the influence of the original brightness correction coefficient of each pixel. Then the newly replaced video brightness data of each pixel is adjusted to uniform the display brightness thereof and the brightness of other parts of the display screen and the final brightness correction coefficient of each newly replaced pixel is gotten by calculation, thereby brightness correction can be performed on each newly replaced pixel with the final brightness correction coefficient to uniform the brightness of the whole panel display. With convenient use and fast performance, the present invention can easily uniform the brightness of the whole panel display with spot or module pixel damage.

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.